* [PATCH v5 00/21] libnvdimm: non-volatile memory devices
@ 2015-06-02 0:14 Dan Williams
2015-06-02 0:14 ` [PATCH v5 01/21] e820, efi: add ACPI 6.0 persistent memory types Dan Williams
` (20 more replies)
0 siblings, 21 replies; 47+ messages in thread
From: Dan Williams @ 2015-06-02 0:14 UTC (permalink / raw)
To: linux-nvdimm
Cc: axboe, sfr, rafael, neilb, gregkh, linux-kernel, mingo,
linux-acpi, jmoyer, linux-api, akpm, hch
Changes since v4 [1]:
1/ Rename libnd to libnvdimm, move the implementation from
drivers/block/nd to drivers/nvdimm, and replace the "nd" prefix with
"nvdimm" where it makes sense. For example, the module name and public
header filename for the major library entry points are libnvdimm.ko
and libnvdimm.h respectively. The entry points are prefixed with
"nvdimm" and the primary bus objects are renamed, i.e.
s/nd_bus/nvdimm_bus/ and s/nd_dimm/nvdimm/. The "nd" prefix remains
as a short lead-in identifier for implementation internal items that
are not nvdimms like regions, commands, labels, etc... (Christoph [2])
2/ Move the unit test infrastructure to an external module in
tools/testing/nvdimm. The linker hack received a strong NAK from
Christoph and it is also problematic that an "allmodconfig" build would
result in including the mocked symbols. With the move and conversion to
an external module we keep the unit tests in tree where they can be
maintained effectively without impacting production builds. (Christoph
[2])
3/ Fixup some miscellaneous 0day sparse reports [3]
4/ Rebased on top of linux-pm.git/acpica (Rafael [4])
[1]: https://lists.01.org/pipermail/linux-nvdimm/2015-May/000804.html
[2]: https://lists.01.org/pipermail/linux-nvdimm/2015-May/000923.html
[3]: https://lists.01.org/pipermail/linux-nvdimm/2015-May/000983.html
[4]: https://lists.01.org/pipermail/linux-nvdimm/2015-May/000921.html
Diffstat since v4:
Documentation/{blockdev => nvdimm}/btt.txt | 0
.../{blockdev/libnd.txt => nvdimm/nvdimm.txt} | 97 ++++----
drivers/acpi/nfit.c | 148 ++++++------
drivers/acpi/nfit.h | 19 +-
drivers/block/nd/Makefile | 29 ---
drivers/block/nd/test/Makefile | 5 -
drivers/{block/nd => nvdimm}/Kconfig | 42 +---
drivers/nvdimm/Makefile | 21 ++
drivers/{block/nd => nvdimm}/blk.c | 6 +-
drivers/{block/nd => nvdimm}/btt.c | 6 +-
drivers/{block/nd => nvdimm}/btt.h | 0
drivers/{block/nd => nvdimm}/btt_devs.c | 38 +--
drivers/{block/nd => nvdimm}/bus.c | 258 ++++++++++-----------
drivers/{block/nd => nvdimm}/core.c | 196 ++++++++--------
drivers/{block/nd => nvdimm}/dimm.c | 44 ++--
drivers/{block/nd => nvdimm}/dimm_devs.c | 188 +++++++--------
drivers/{block/nd => nvdimm}/label.c | 116 ++++-----
drivers/{block/nd => nvdimm}/label.h | 22 +-
drivers/{block/nd => nvdimm}/namespace_devs.c | 108 ++++-----
drivers/{block/nd => nvdimm}/nd-private.h | 62 +++--
drivers/{block/nd => nvdimm}/nd.h | 44 ++--
drivers/{block/nd => nvdimm}/pmem.c | 6 +-
drivers/{block/nd => nvdimm}/region.c | 10 +-
drivers/{block/nd => nvdimm}/region_devs.c | 126 +++++-----
include/linux/{libnd.h => libnvdimm.h} | 68 +++---
tools/testing/nvdimm/Kbuild | 37 +++
tools/testing/nvdimm/Makefile | 7 +
tools/testing/nvdimm/test/Kbuild | 8 +
.../block/nd => tools/testing/nvdimm}/test/iomap.c | 0
.../block/nd => tools/testing/nvdimm}/test/nfit.c | 122 +++-------
.../nd => tools/testing/nvdimm}/test/nfit_test.h | 0
31 files changed, 895 insertions(+), 938 deletions(-)
rename Documentation/{blockdev => nvdimm}/btt.txt (100%)
rename Documentation/{blockdev/libnd.txt => nvdimm/nvdimm.txt} (92%)
delete mode 100644 drivers/block/nd/Makefile
delete mode 100644 drivers/block/nd/test/Makefile
rename drivers/{block/nd => nvdimm}/Kconfig (72%)
create mode 100644 drivers/nvdimm/Makefile
rename drivers/{block/nd => nvdimm}/blk.c (98%)
rename drivers/{block/nd => nvdimm}/btt.c (99%)
rename drivers/{block/nd => nvdimm}/btt.h (100%)
rename drivers/{block/nd => nvdimm}/btt_devs.c (90%)
rename drivers/{block/nd => nvdimm}/bus.c (68%)
rename drivers/{block/nd => nvdimm}/core.c (62%)
rename drivers/{block/nd => nvdimm}/dimm.c (71%)
rename drivers/{block/nd => nvdimm}/dimm_devs.c (69%)
rename drivers/{block/nd => nvdimm}/label.c (89%)
rename drivers/{block/nd => nvdimm}/label.h (87%)
rename drivers/{block/nd => nvdimm}/namespace_devs.c (94%)
rename drivers/{block/nd => nvdimm}/nd-private.h (57%)
rename drivers/{block/nd => nvdimm}/nd.h (86%)
rename drivers/{block/nd => nvdimm}/pmem.c (99%)
rename drivers/{block/nd => nvdimm}/region.c (96%)
rename drivers/{block/nd => nvdimm}/region_devs.c (83%)
rename include/linux/{libnd.h => libnvdimm.h} (62%)
create mode 100644 tools/testing/nvdimm/Kbuild
create mode 100644 tools/testing/nvdimm/Makefile
create mode 100644 tools/testing/nvdimm/test/Kbuild
rename {drivers/block/nd => tools/testing/nvdimm}/test/iomap.c (100%)
rename {drivers/block/nd => tools/testing/nvdimm}/test/nfit.c (91%)
rename {drivers/block/nd => tools/testing/nvdimm}/test/nfit_test.h (100%)
---
Dan Williams (18):
e820, efi: add ACPI 6.0 persistent memory types
libnvdimm, nfit: initial libnvdimm infrastructure and NFIT support
libnvdimm: control character device and libnvdimm bus sysfs attributes
libnvdimm, nfit: dimm/memory-devices
libnvdimm: control (ioctl) messages for libnvdimm bus and dimm devices
libnvdimm, nvdimm: dimm driver and base libnvdimm device-driver infrastructure
libnvdimm, nfit: regions (block-data-window, persistent memory, volatile memory)
libnvdimm: support for legacy (non-aliasing) nvdimms
libnvdimm, nd_pmem: add libnvdimm support to the pmem driver
libnvdimm, nfit: add interleave-set state-tracking infrastructure
libnvdimm: namespace indices: read and validate
libnvdimm: pmem label sets and namespace instantiation.
libnvdimm: blk labels and namespace instantiation
libnvdimm: write pmem label set
libnvdimm: write blk label set
libnvdimm: infrastructure for btt devices
tools/testing/nvdimm: manufactured NFITs for interface development
libnvdimm: Non-Volatile Devices
Ross Zwisler (2):
pmem: Dynamically allocate partition numbers
libnvdimm, nfit, nd_blk: driver for BLK-mode access persistent memory
Vishal Verma (1):
nd_btt: atomic sector updates
Documentation/nvdimm/btt.txt | 273 +++++
Documentation/nvdimm/nvdimm.txt | 805 ++++++++++++++++
MAINTAINERS | 39 +
arch/arm64/kernel/efi.c | 1
arch/ia64/kernel/efi.c | 4
arch/x86/Kconfig | 4
arch/x86/boot/compressed/eboot.c | 4
arch/x86/include/uapi/asm/e820.h | 1
arch/x86/kernel/e820.c | 28 -
arch/x86/kernel/pmem.c | 92 +-
arch/x86/platform/efi/efi.c | 3
drivers/Kconfig | 2
drivers/Makefile | 1
drivers/acpi/Kconfig | 27 +
drivers/acpi/Makefile | 2
drivers/acpi/nfit.c | 1474 +++++++++++++++++++++++++++++
drivers/acpi/nfit.h | 161 +++
drivers/block/Kconfig | 11
drivers/block/Makefile | 1
drivers/nvdimm/Kconfig | 79 ++
drivers/nvdimm/Makefile | 21
drivers/nvdimm/blk.c | 252 +++++
drivers/nvdimm/btt.c | 1440 ++++++++++++++++++++++++++++
drivers/nvdimm/btt.h | 186 ++++
drivers/nvdimm/btt_devs.c | 443 +++++++++
drivers/nvdimm/bus.c | 770 +++++++++++++++
drivers/nvdimm/core.c | 472 +++++++++
drivers/nvdimm/dimm.c | 115 ++
drivers/nvdimm/dimm_devs.c | 516 ++++++++++
drivers/nvdimm/label.c | 926 ++++++++++++++++++
drivers/nvdimm/label.h | 143 +++
drivers/nvdimm/namespace_devs.c | 1702 +++++++++++++++++++++++++++++++++
drivers/nvdimm/nd-private.h | 107 ++
drivers/nvdimm/nd.h | 261 +++++
drivers/nvdimm/pmem.c | 107 +-
drivers/nvdimm/region.c | 189 ++++
drivers/nvdimm/region_devs.c | 667 +++++++++++++
include/linux/efi.h | 3
include/linux/libnvdimm.h | 131 +++
include/linux/nd.h | 98 ++
include/uapi/linux/Kbuild | 1
include/uapi/linux/ndctl.h | 199 ++++
tools/testing/nvdimm/Kbuild | 37 +
tools/testing/nvdimm/Makefile | 7
tools/testing/nvdimm/test/Kbuild | 8
tools/testing/nvdimm/test/iomap.c | 151 +++
tools/testing/nvdimm/test/nfit.c | 1101 +++++++++++++++++++++
tools/testing/nvdimm/test/nfit_test.h | 28 +
48 files changed, 13004 insertions(+), 89 deletions(-)
create mode 100644 Documentation/nvdimm/btt.txt
create mode 100644 Documentation/nvdimm/nvdimm.txt
create mode 100644 drivers/acpi/nfit.c
create mode 100644 drivers/acpi/nfit.h
create mode 100644 drivers/nvdimm/Kconfig
create mode 100644 drivers/nvdimm/Makefile
create mode 100644 drivers/nvdimm/blk.c
create mode 100644 drivers/nvdimm/btt.c
create mode 100644 drivers/nvdimm/btt.h
create mode 100644 drivers/nvdimm/btt_devs.c
create mode 100644 drivers/nvdimm/bus.c
create mode 100644 drivers/nvdimm/core.c
create mode 100644 drivers/nvdimm/dimm.c
create mode 100644 drivers/nvdimm/dimm_devs.c
create mode 100644 drivers/nvdimm/label.c
create mode 100644 drivers/nvdimm/label.h
create mode 100644 drivers/nvdimm/namespace_devs.c
create mode 100644 drivers/nvdimm/nd-private.h
create mode 100644 drivers/nvdimm/nd.h
rename drivers/{block/pmem.c => nvdimm/pmem.c} (70%)
create mode 100644 drivers/nvdimm/region.c
create mode 100644 drivers/nvdimm/region_devs.c
create mode 100644 include/linux/libnvdimm.h
create mode 100644 include/linux/nd.h
create mode 100644 include/uapi/linux/ndctl.h
create mode 100644 tools/testing/nvdimm/Kbuild
create mode 100644 tools/testing/nvdimm/Makefile
create mode 100644 tools/testing/nvdimm/test/Kbuild
create mode 100644 tools/testing/nvdimm/test/iomap.c
create mode 100644 tools/testing/nvdimm/test/nfit.c
create mode 100644 tools/testing/nvdimm/test/nfit_test.h
^ permalink raw reply [flat|nested] 47+ messages in thread
* [PATCH v5 01/21] e820, efi: add ACPI 6.0 persistent memory types
2015-06-02 0:14 [PATCH v5 00/21] libnvdimm: non-volatile memory devices Dan Williams
@ 2015-06-02 0:14 ` Dan Williams
2015-06-02 0:14 ` [PATCH v5 02/21] libnvdimm, nfit: initial libnvdimm infrastructure and NFIT support Dan Williams
` (19 subsequent siblings)
20 siblings, 0 replies; 47+ messages in thread
From: Dan Williams @ 2015-06-02 0:14 UTC (permalink / raw)
To: linux-nvdimm
Cc: axboe, sfr, rafael, neilb, gregkh, linux-kernel, mingo,
linux-acpi, jmoyer, linux-api, akpm, hch
ACPI 6.0 formalizes e820-type-7 and efi-type-14 as persistent memory.
Mark it "reserved" and allow it to be claimed by a persistent memory
device driver.
This definition is in addition to the Linux kernel's existing type-12
definition that was recently added in support of shipping platforms with
NVDIMM support that predate ACPI 6.0 (which now classifies type-12 as
OEM reserved).
Note, /proc/iomem can be consulted for differentiating legacy
"Persistent Memory (legacy)" E820_PRAM vs standard "Persistent Memory"
E820_PMEM.
Cc: Boaz Harrosh <boaz@plexistor.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Jens Axboe <axboe@fb.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Matthew Wilcox <willy@linux.intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Jeff Moyer <jmoyer@redhat.com>
Acked-by: Andy Lutomirski <luto@amacapital.net>
Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
arch/arm64/kernel/efi.c | 1 +
arch/ia64/kernel/efi.c | 4 ++++
arch/x86/boot/compressed/eboot.c | 4 ++++
arch/x86/include/uapi/asm/e820.h | 1 +
arch/x86/kernel/e820.c | 28 ++++++++++++++++++++++++----
arch/x86/platform/efi/efi.c | 3 +++
include/linux/efi.h | 3 ++-
7 files changed, 39 insertions(+), 5 deletions(-)
diff --git a/arch/arm64/kernel/efi.c b/arch/arm64/kernel/efi.c
index ab21e0d58278..9d4aa18f2a82 100644
--- a/arch/arm64/kernel/efi.c
+++ b/arch/arm64/kernel/efi.c
@@ -158,6 +158,7 @@ static __init int is_reserve_region(efi_memory_desc_t *md)
case EFI_BOOT_SERVICES_CODE:
case EFI_BOOT_SERVICES_DATA:
case EFI_CONVENTIONAL_MEMORY:
+ case EFI_PERSISTENT_MEMORY:
return 0;
default:
break;
diff --git a/arch/ia64/kernel/efi.c b/arch/ia64/kernel/efi.c
index c52d7540dc05..5f6be9dd6968 100644
--- a/arch/ia64/kernel/efi.c
+++ b/arch/ia64/kernel/efi.c
@@ -1223,6 +1223,10 @@ efi_initialize_iomem_resources(struct resource *code_resource,
flags |= IORESOURCE_DISABLED;
break;
+ case EFI_PERSISTENT_MEMORY:
+ name = "Persistent Memory";
+ break;
+
case EFI_RESERVED_TYPE:
case EFI_RUNTIME_SERVICES_CODE:
case EFI_RUNTIME_SERVICES_DATA:
diff --git a/arch/x86/boot/compressed/eboot.c b/arch/x86/boot/compressed/eboot.c
index 48304b89b601..2c82bd150d43 100644
--- a/arch/x86/boot/compressed/eboot.c
+++ b/arch/x86/boot/compressed/eboot.c
@@ -1224,6 +1224,10 @@ static efi_status_t setup_e820(struct boot_params *params,
e820_type = E820_NVS;
break;
+ case EFI_PERSISTENT_MEMORY:
+ e820_type = E820_PMEM;
+ break;
+
default:
continue;
}
diff --git a/arch/x86/include/uapi/asm/e820.h b/arch/x86/include/uapi/asm/e820.h
index 960a8a9dc4ab..0f457e6eab18 100644
--- a/arch/x86/include/uapi/asm/e820.h
+++ b/arch/x86/include/uapi/asm/e820.h
@@ -32,6 +32,7 @@
#define E820_ACPI 3
#define E820_NVS 4
#define E820_UNUSABLE 5
+#define E820_PMEM 7
/*
* This is a non-standardized way to represent ADR or NVDIMM regions that
diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c
index e2ce85db2283..c857d53269dd 100644
--- a/arch/x86/kernel/e820.c
+++ b/arch/x86/kernel/e820.c
@@ -149,6 +149,7 @@ static void __init e820_print_type(u32 type)
case E820_UNUSABLE:
printk(KERN_CONT "unusable");
break;
+ case E820_PMEM:
case E820_PRAM:
printk(KERN_CONT "persistent (type %u)", type);
break;
@@ -918,11 +919,32 @@ static inline const char *e820_type_to_string(int e820_type)
case E820_ACPI: return "ACPI Tables";
case E820_NVS: return "ACPI Non-volatile Storage";
case E820_UNUSABLE: return "Unusable memory";
- case E820_PRAM: return "Persistent RAM";
+ case E820_PRAM: return "Persistent Memory (legacy)";
+ case E820_PMEM: return "Persistent Memory";
default: return "reserved";
}
}
+static bool do_mark_busy(u32 type, struct resource *res)
+{
+ /* this is the legacy bios/dos rom-shadow + mmio region */
+ if (res->start < (1ULL<<20))
+ return true;
+
+ /*
+ * Treat persistent memory like device memory, i.e. reserve it
+ * for exclusive use of a driver
+ */
+ switch (type) {
+ case E820_RESERVED:
+ case E820_PRAM:
+ case E820_PMEM:
+ return false;
+ default:
+ return true;
+ }
+}
+
/*
* Mark e820 reserved areas as busy for the resource manager.
*/
@@ -952,9 +974,7 @@ void __init e820_reserve_resources(void)
* pci device BAR resource and insert them later in
* pcibios_resource_survey()
*/
- if (((e820.map[i].type != E820_RESERVED) &&
- (e820.map[i].type != E820_PRAM)) ||
- res->start < (1ULL<<20)) {
+ if (do_mark_busy(e820.map[i].type, res)) {
res->flags |= IORESOURCE_BUSY;
insert_resource(&iomem_resource, res);
}
diff --git a/arch/x86/platform/efi/efi.c b/arch/x86/platform/efi/efi.c
index 02744df576d5..fe01ae37a2a4 100644
--- a/arch/x86/platform/efi/efi.c
+++ b/arch/x86/platform/efi/efi.c
@@ -153,6 +153,9 @@ static void __init do_add_efi_memmap(void)
case EFI_UNUSABLE_MEMORY:
e820_type = E820_UNUSABLE;
break;
+ case EFI_PERSISTENT_MEMORY:
+ e820_type = E820_PMEM;
+ break;
default:
/*
* EFI_RESERVED_TYPE EFI_RUNTIME_SERVICES_CODE
diff --git a/include/linux/efi.h b/include/linux/efi.h
index af5be0368dec..825b6e3d69cb 100644
--- a/include/linux/efi.h
+++ b/include/linux/efi.h
@@ -85,7 +85,8 @@ typedef struct {
#define EFI_MEMORY_MAPPED_IO 11
#define EFI_MEMORY_MAPPED_IO_PORT_SPACE 12
#define EFI_PAL_CODE 13
-#define EFI_MAX_MEMORY_TYPE 14
+#define EFI_PERSISTENT_MEMORY 14
+#define EFI_MAX_MEMORY_TYPE 15
/* Attribute values: */
#define EFI_MEMORY_UC ((u64)0x0000000000000001ULL) /* uncached */
^ permalink raw reply related [flat|nested] 47+ messages in thread
* [PATCH v5 02/21] libnvdimm, nfit: initial libnvdimm infrastructure and NFIT support
2015-06-02 0:14 [PATCH v5 00/21] libnvdimm: non-volatile memory devices Dan Williams
2015-06-02 0:14 ` [PATCH v5 01/21] e820, efi: add ACPI 6.0 persistent memory types Dan Williams
@ 2015-06-02 0:14 ` Dan Williams
2015-06-03 14:57 ` Christoph Hellwig
2015-06-02 0:14 ` [PATCH v5 03/21] libnvdimm: control character device and libnvdimm bus sysfs attributes Dan Williams
` (18 subsequent siblings)
20 siblings, 1 reply; 47+ messages in thread
From: Dan Williams @ 2015-06-02 0:14 UTC (permalink / raw)
To: linux-nvdimm
Cc: axboe, sfr, rafael, neilb, gregkh, linux-kernel, mingo,
linux-acpi, jmoyer, linux-api, akpm, hch
A libnvdimm bus is the anchor device for registering nvdimm resources and
interfaces, for example, a character control device, nvdimm devices,
and I/O region devices. The ACPI NFIT (NVDIMM Firmware Interface Table)
is one possible platform description for such non-volatile memory
resources in a system. The nfit.ko driver attaches to the "ACPI0012"
device that indicates the presence of the NFIT and parses the table to
register a libnvdimm bus instance.
Cc: <linux-acpi@vger.kernel.org>
Cc: Lv Zheng <lv.zheng@intel.com>
Cc: Robert Moore <robert.moore@intel.com>
Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
drivers/Kconfig | 2
drivers/Makefile | 1
drivers/acpi/Kconfig | 15 +
drivers/acpi/Makefile | 1
drivers/acpi/nfit.c | 444 +++++++++++++++++++++++++++++++++++++++++++
drivers/acpi/nfit.h | 89 +++++++++
drivers/nvdimm/Kconfig | 20 ++
drivers/nvdimm/Makefile | 3
drivers/nvdimm/core.c | 67 ++++++
drivers/nvdimm/nd-private.h | 23 ++
include/linux/libnvdimm.h | 34 +++
11 files changed, 699 insertions(+)
create mode 100644 drivers/acpi/nfit.c
create mode 100644 drivers/acpi/nfit.h
create mode 100644 drivers/nvdimm/Kconfig
create mode 100644 drivers/nvdimm/Makefile
create mode 100644 drivers/nvdimm/core.c
create mode 100644 drivers/nvdimm/nd-private.h
create mode 100644 include/linux/libnvdimm.h
diff --git a/drivers/Kconfig b/drivers/Kconfig
index c0cc96bab9e7..6e973b8e3a3b 100644
--- a/drivers/Kconfig
+++ b/drivers/Kconfig
@@ -182,4 +182,6 @@ source "drivers/thunderbolt/Kconfig"
source "drivers/android/Kconfig"
+source "drivers/nvdimm/Kconfig"
+
endmenu
diff --git a/drivers/Makefile b/drivers/Makefile
index 46d2554be404..80025088115e 100644
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -64,6 +64,7 @@ obj-$(CONFIG_FB_INTEL) += video/fbdev/intelfb/
obj-$(CONFIG_PARPORT) += parport/
obj-y += base/ block/ misc/ mfd/ nfc/
+obj-$(CONFIG_NVDIMM_DEVICES) += nvdimm/
obj-$(CONFIG_DMA_SHARED_BUFFER) += dma-buf/
obj-$(CONFIG_NUBUS) += nubus/
obj-y += macintosh/
diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index ab2cbb51c6aa..3989660ceb8f 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -383,6 +383,21 @@ config ACPI_REDUCED_HARDWARE_ONLY
If you are unsure what to do, do not enable this option.
+config ACPI_NFIT
+ tristate "ACPI NVDIMM Firmware Interface Table (NFIT)"
+ depends on PHYS_ADDR_T_64BIT
+ depends on BLK_DEV
+ select NVDIMM_DEVICES
+ select LIBNVDIMM
+ help
+ Infrastructure to probe ACPI 6 compliant platforms for
+ NVDIMMs (NFIT) and register a libnvdimm device tree. In
+ addition to storage devices this also enables libnvdimm to pass
+ ACPI._DSM messages for platform/dimm configuration.
+
+ To compile this driver as a module, choose M here:
+ the module will be called nfit.
+
source "drivers/acpi/apei/Kconfig"
config ACPI_EXTLOG
diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
index 8a063e276530..f7e9c92ccdcb 100644
--- a/drivers/acpi/Makefile
+++ b/drivers/acpi/Makefile
@@ -71,6 +71,7 @@ obj-$(CONFIG_ACPI_PCI_SLOT) += pci_slot.o
obj-$(CONFIG_ACPI_PROCESSOR) += processor.o
obj-y += container.o
obj-$(CONFIG_ACPI_THERMAL) += thermal.o
+obj-$(CONFIG_ACPI_NFIT) += nfit.o
obj-y += acpi_memhotplug.o
obj-$(CONFIG_ACPI_HOTPLUG_IOAPIC) += ioapic.o
obj-$(CONFIG_ACPI_BATTERY) += battery.o
diff --git a/drivers/acpi/nfit.c b/drivers/acpi/nfit.c
new file mode 100644
index 000000000000..314cf9d2522b
--- /dev/null
+++ b/drivers/acpi/nfit.c
@@ -0,0 +1,444 @@
+/*
+ * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ */
+#include <linux/list_sort.h>
+#include <linux/libnvdimm.h>
+#include <linux/module.h>
+#include <linux/list.h>
+#include <linux/acpi.h>
+#include "nfit.h"
+
+static u8 nfit_uuid[NFIT_UUID_MAX][16];
+
+static const u8 *to_nfit_uuid(enum nfit_uuids id)
+{
+ return nfit_uuid[id];
+}
+
+static int acpi_nfit_ctl(struct nvdimm_bus_descriptor *nd_desc,
+ struct nvdimm *nvdimm, unsigned int cmd, void *buf,
+ unsigned int buf_len)
+{
+ return -ENOTTY;
+}
+
+static const char *spa_type_name(u16 type)
+{
+ switch (type) {
+ case NFIT_SPA_VOLATILE: return "volatile";
+ case NFIT_SPA_PM: return "pmem";
+ case NFIT_SPA_DCR: return "dimm-control-region";
+ case NFIT_SPA_BDW: return "block-data-window";
+ default: return "unknown";
+ }
+}
+
+static int nfit_spa_type(struct acpi_nfit_system_address *spa)
+{
+ int i;
+
+ for (i = 0; i < NFIT_UUID_MAX; i++)
+ if (memcmp(to_nfit_uuid(i), spa->range_guid, 16) == 0)
+ return i;
+ return -1;
+}
+
+static void *add_table(struct acpi_nfit_desc *acpi_desc, void *table, const void *end)
+{
+ struct device *dev = acpi_desc->dev;
+ struct acpi_nfit_header *hdr;
+ void *err = ERR_PTR(-ENOMEM);
+
+ if (table >= end)
+ return NULL;
+
+ hdr = (struct acpi_nfit_header *) table;
+ switch (hdr->type) {
+ case ACPI_NFIT_TYPE_SYSTEM_ADDRESS: {
+ struct nfit_spa *nfit_spa = devm_kzalloc(dev, sizeof(*nfit_spa),
+ GFP_KERNEL);
+ struct acpi_nfit_system_address *spa = table;
+
+ if (!nfit_spa)
+ return err;
+ INIT_LIST_HEAD(&nfit_spa->list);
+ nfit_spa->spa = spa;
+ list_add_tail(&nfit_spa->list, &acpi_desc->spas);
+ dev_dbg(dev, "%s: spa index: %d type: %s\n", __func__,
+ spa->range_index,
+ spa_type_name(nfit_spa_type(spa)));
+ break;
+ }
+ case ACPI_NFIT_TYPE_MEMORY_MAP: {
+ struct nfit_memdev *nfit_memdev = devm_kzalloc(dev,
+ sizeof(*nfit_memdev), GFP_KERNEL);
+ struct acpi_nfit_memory_map *memdev = table;
+
+ if (!nfit_memdev)
+ return err;
+ INIT_LIST_HEAD(&nfit_memdev->list);
+ nfit_memdev->memdev = memdev;
+ list_add_tail(&nfit_memdev->list, &acpi_desc->memdevs);
+ dev_dbg(dev, "%s: memdev handle: %#x spa: %d dcr: %d\n",
+ __func__, memdev->device_handle, memdev->range_index,
+ memdev->region_index);
+ break;
+ }
+ case ACPI_NFIT_TYPE_CONTROL_REGION: {
+ struct nfit_dcr *nfit_dcr = devm_kzalloc(dev, sizeof(*nfit_dcr),
+ GFP_KERNEL);
+ struct acpi_nfit_control_region *dcr = table;
+
+ if (!nfit_dcr)
+ return err;
+ INIT_LIST_HEAD(&nfit_dcr->list);
+ nfit_dcr->dcr = dcr;
+ list_add_tail(&nfit_dcr->list, &acpi_desc->dcrs);
+ dev_dbg(dev, "%s: dcr index: %d windows: %d\n", __func__,
+ dcr->region_index, dcr->windows);
+ break;
+ }
+ case ACPI_NFIT_TYPE_DATA_REGION: {
+ struct nfit_bdw *nfit_bdw = devm_kzalloc(dev, sizeof(*nfit_bdw),
+ GFP_KERNEL);
+ struct acpi_nfit_data_region *bdw = table;
+
+ if (!nfit_bdw)
+ return err;
+ INIT_LIST_HEAD(&nfit_bdw->list);
+ nfit_bdw->bdw = bdw;
+ list_add_tail(&nfit_bdw->list, &acpi_desc->bdws);
+ dev_dbg(dev, "%s: bdw dcr: %d windows: %d\n", __func__,
+ bdw->region_index, bdw->windows);
+ break;
+ }
+ /* TODO */
+ case ACPI_NFIT_TYPE_INTERLEAVE:
+ dev_dbg(dev, "%s: idt\n", __func__);
+ break;
+ case ACPI_NFIT_TYPE_FLUSH_ADDRESS:
+ dev_dbg(dev, "%s: flush\n", __func__);
+ break;
+ case ACPI_NFIT_TYPE_SMBIOS:
+ dev_dbg(dev, "%s: smbios\n", __func__);
+ break;
+ default:
+ dev_err(dev, "unknown table '%d' parsing nfit\n", hdr->type);
+ break;
+ }
+
+ return table + hdr->length;
+}
+
+static void nfit_mem_find_spa_bdw(struct acpi_nfit_desc *acpi_desc,
+ struct nfit_mem *nfit_mem)
+{
+ u32 device_handle = __to_nfit_memdev(nfit_mem)->device_handle;
+ u16 dcr_index = nfit_mem->dcr->region_index;
+ struct nfit_spa *nfit_spa;
+
+ list_for_each_entry(nfit_spa, &acpi_desc->spas, list) {
+ u16 range_index = nfit_spa->spa->range_index;
+ int type = nfit_spa_type(nfit_spa->spa);
+ struct nfit_memdev *nfit_memdev;
+
+ if (type != NFIT_SPA_BDW)
+ continue;
+
+ list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) {
+ if (nfit_memdev->memdev->range_index != range_index)
+ continue;
+ if (nfit_memdev->memdev->device_handle != device_handle)
+ continue;
+ if (nfit_memdev->memdev->region_index != dcr_index)
+ continue;
+
+ nfit_mem->spa_bdw = nfit_spa->spa;
+ return;
+ }
+ }
+
+ dev_dbg(acpi_desc->dev, "SPA-BDW not found for SPA-DCR %d\n",
+ nfit_mem->spa_dcr->range_index);
+ nfit_mem->bdw = NULL;
+}
+
+static int nfit_mem_add(struct acpi_nfit_desc *acpi_desc,
+ struct nfit_mem *nfit_mem, struct acpi_nfit_system_address *spa)
+{
+ u16 dcr_index = __to_nfit_memdev(nfit_mem)->region_index;
+ struct nfit_dcr *nfit_dcr;
+ struct nfit_bdw *nfit_bdw;
+
+ list_for_each_entry(nfit_dcr, &acpi_desc->dcrs, list) {
+ if (nfit_dcr->dcr->region_index != dcr_index)
+ continue;
+ nfit_mem->dcr = nfit_dcr->dcr;
+ break;
+ }
+
+ if (!nfit_mem->dcr) {
+ dev_dbg(acpi_desc->dev, "SPA %d missing:%s%s\n", spa->range_index,
+ __to_nfit_memdev(nfit_mem) ? "" : " MEMDEV",
+ nfit_mem->dcr ? "" : " DCR");
+ return -ENODEV;
+ }
+
+ /*
+ * We've found enough to create an nvdimm, optionally
+ * find an associated BDW
+ */
+ list_add(&nfit_mem->list, &acpi_desc->dimms);
+
+ list_for_each_entry(nfit_bdw, &acpi_desc->bdws, list) {
+ if (nfit_bdw->bdw->region_index != dcr_index)
+ continue;
+ nfit_mem->bdw = nfit_bdw->bdw;
+ break;
+ }
+
+ if (!nfit_mem->bdw)
+ return 0;
+
+ nfit_mem_find_spa_bdw(acpi_desc, nfit_mem);
+ return 0;
+}
+
+static int nfit_mem_dcr_init(struct acpi_nfit_desc *acpi_desc,
+ struct acpi_nfit_system_address *spa)
+{
+ struct nfit_mem *nfit_mem, *found;
+ struct nfit_memdev *nfit_memdev;
+ int type = nfit_spa_type(spa);
+ u16 dcr_index;
+
+ switch (type) {
+ case NFIT_SPA_DCR:
+ case NFIT_SPA_PM:
+ break;
+ default:
+ return 0;
+ }
+
+ list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) {
+ int rc;
+
+ if (nfit_memdev->memdev->range_index != spa->range_index)
+ continue;
+ found = NULL;
+ dcr_index = nfit_memdev->memdev->region_index;
+ list_for_each_entry(nfit_mem, &acpi_desc->dimms, list)
+ if (__to_nfit_memdev(nfit_mem)->region_index == dcr_index) {
+ found = nfit_mem;
+ break;
+ }
+
+ if (found)
+ nfit_mem = found;
+ else {
+ nfit_mem = devm_kzalloc(acpi_desc->dev,
+ sizeof(*nfit_mem), GFP_KERNEL);
+ if (!nfit_mem)
+ return -ENOMEM;
+ INIT_LIST_HEAD(&nfit_mem->list);
+ }
+
+ if (type == NFIT_SPA_DCR) {
+ /* multiple dimms may share a SPA when interleaved */
+ nfit_mem->spa_dcr = spa;
+ nfit_mem->memdev_dcr = nfit_memdev->memdev;
+ } else {
+ /*
+ * A single dimm may belong to multiple SPA-PM
+ * ranges, record at least one in addition to
+ * any SPA-DCR range.
+ */
+ nfit_mem->memdev_pmem = nfit_memdev->memdev;
+ }
+
+ if (found)
+ continue;
+
+ rc = nfit_mem_add(acpi_desc, nfit_mem, spa);
+ if (rc)
+ return rc;
+ }
+
+ return 0;
+}
+
+static int nfit_mem_cmp(void *priv, struct list_head *__a, struct list_head *__b)
+{
+ struct nfit_mem *a = container_of(__a, typeof(*a), list);
+ struct nfit_mem *b = container_of(__b, typeof(*b), list);
+ u32 handleA, handleB;
+
+ handleA = __to_nfit_memdev(a)->device_handle;
+ handleB = __to_nfit_memdev(b)->device_handle;
+ if (handleA < handleB)
+ return -1;
+ else if (handleA > handleB)
+ return 1;
+ return 0;
+}
+
+static int nfit_mem_init(struct acpi_nfit_desc *acpi_desc)
+{
+ struct nfit_spa *nfit_spa;
+
+ /*
+ * For each SPA-DCR or SPA-PMEM address range find its
+ * corresponding MEMDEV(s). From each MEMDEV find the
+ * corresponding DCR. Then, if we're operating on a SPA-DCR,
+ * try to find a SPA-BDW and a corresponding BDW that references
+ * the DCR. Throw it all into an nfit_mem object. Note, that
+ * BDWs are optional.
+ */
+ list_for_each_entry(nfit_spa, &acpi_desc->spas, list) {
+ int rc;
+
+ rc = nfit_mem_dcr_init(acpi_desc, nfit_spa->spa);
+ if (rc)
+ return rc;
+ }
+
+ list_sort(NULL, &acpi_desc->dimms, nfit_mem_cmp);
+
+ return 0;
+}
+
+static int acpi_nfit_init(struct acpi_nfit_desc *acpi_desc, acpi_size sz)
+{
+ struct device *dev = acpi_desc->dev;
+ const void *end;
+ u8 *data;
+
+ INIT_LIST_HEAD(&acpi_desc->spas);
+ INIT_LIST_HEAD(&acpi_desc->dcrs);
+ INIT_LIST_HEAD(&acpi_desc->bdws);
+ INIT_LIST_HEAD(&acpi_desc->memdevs);
+ INIT_LIST_HEAD(&acpi_desc->dimms);
+
+ data = (u8 *) acpi_desc->nfit;
+ end = data + sz;
+ data += sizeof(struct acpi_table_nfit);
+ while (!IS_ERR_OR_NULL(data))
+ data = add_table(acpi_desc, data, end);
+
+ if (IS_ERR(data)) {
+ dev_dbg(dev, "%s: nfit table parsing error: %ld\n", __func__,
+ PTR_ERR(data));
+ return PTR_ERR(data);
+ }
+
+ if (nfit_mem_init(acpi_desc) != 0)
+ return -ENOMEM;
+
+ return 0;
+}
+
+static int acpi_nfit_add(struct acpi_device *adev)
+{
+ struct nvdimm_bus_descriptor *nd_desc;
+ struct acpi_nfit_desc *acpi_desc;
+ struct device *dev = &adev->dev;
+ struct acpi_table_header *tbl;
+ acpi_status status = AE_OK;
+ acpi_size sz;
+ int rc;
+
+ status = acpi_get_table_with_size("NFIT", 0, &tbl, &sz);
+ if (ACPI_FAILURE(status)) {
+ dev_err(dev, "failed to find NFIT\n");
+ return -ENXIO;
+ }
+
+ acpi_desc = devm_kzalloc(dev, sizeof(*acpi_desc), GFP_KERNEL);
+ if (!acpi_desc)
+ return -ENOMEM;
+
+ dev_set_drvdata(dev, acpi_desc);
+ acpi_desc->dev = dev;
+ acpi_desc->nfit = (struct acpi_table_nfit *) tbl;
+ nd_desc = &acpi_desc->nd_desc;
+ nd_desc->provider_name = "ACPI.NFIT";
+ nd_desc->ndctl = acpi_nfit_ctl;
+
+ acpi_desc->nvdimm_bus = nvdimm_bus_register(dev, nd_desc);
+ if (!acpi_desc->nvdimm_bus)
+ return -ENXIO;
+
+ rc = acpi_nfit_init(acpi_desc, sz);
+ if (rc) {
+ nvdimm_bus_unregister(acpi_desc->nvdimm_bus);
+ return rc;
+ }
+ return 0;
+}
+
+static int acpi_nfit_remove(struct acpi_device *adev)
+{
+ struct acpi_nfit_desc *acpi_desc = dev_get_drvdata(&adev->dev);
+
+ nvdimm_bus_unregister(acpi_desc->nvdimm_bus);
+ return 0;
+}
+
+static const struct acpi_device_id acpi_nfit_ids[] = {
+ { "ACPI0012", 0 },
+ { "", 0 },
+};
+MODULE_DEVICE_TABLE(acpi, acpi_nfit_ids);
+
+static struct acpi_driver acpi_nfit_driver = {
+ .name = KBUILD_MODNAME,
+ .ids = acpi_nfit_ids,
+ .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
+ .ops = {
+ .add = acpi_nfit_add,
+ .remove = acpi_nfit_remove,
+ },
+};
+
+static __init int nfit_init(void)
+{
+ BUILD_BUG_ON(sizeof(struct acpi_table_nfit) != 40);
+ BUILD_BUG_ON(sizeof(struct acpi_nfit_system_address) != 56);
+ BUILD_BUG_ON(sizeof(struct acpi_nfit_memory_map) != 48);
+ BUILD_BUG_ON(sizeof(struct acpi_nfit_interleave) != 20);
+ BUILD_BUG_ON(sizeof(struct acpi_nfit_smbios) != 9);
+ BUILD_BUG_ON(sizeof(struct acpi_nfit_control_region) != 80);
+ BUILD_BUG_ON(sizeof(struct acpi_nfit_data_region) != 40);
+
+ acpi_str_to_uuid(UUID_VOLATILE_MEMORY, nfit_uuid[NFIT_SPA_VOLATILE]);
+ acpi_str_to_uuid(UUID_PERSISTENT_MEMORY, nfit_uuid[NFIT_SPA_PM]);
+ acpi_str_to_uuid(UUID_CONTROL_REGION, nfit_uuid[NFIT_SPA_DCR]);
+ acpi_str_to_uuid(UUID_DATA_REGION, nfit_uuid[NFIT_SPA_BDW]);
+ acpi_str_to_uuid(UUID_VOLATILE_VIRTUAL_DISK, nfit_uuid[NFIT_SPA_VDISK]);
+ acpi_str_to_uuid(UUID_VOLATILE_VIRTUAL_CD, nfit_uuid[NFIT_SPA_VCD]);
+ acpi_str_to_uuid(UUID_PERSISTENT_VIRTUAL_DISK, nfit_uuid[NFIT_SPA_PDISK]);
+ acpi_str_to_uuid(UUID_PERSISTENT_VIRTUAL_CD, nfit_uuid[NFIT_SPA_PCD]);
+ acpi_str_to_uuid(UUID_NFIT_BUS, nfit_uuid[NFIT_DEV_BUS]);
+ acpi_str_to_uuid(UUID_NFIT_DIMM, nfit_uuid[NFIT_DEV_DIMM]);
+
+ return acpi_bus_register_driver(&acpi_nfit_driver);
+}
+
+static __exit void nfit_exit(void)
+{
+ acpi_bus_unregister_driver(&acpi_nfit_driver);
+}
+
+module_init(nfit_init);
+module_exit(nfit_exit);
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Intel Corporation");
diff --git a/drivers/acpi/nfit.h b/drivers/acpi/nfit.h
new file mode 100644
index 000000000000..2d98cc1b7b6c
--- /dev/null
+++ b/drivers/acpi/nfit.h
@@ -0,0 +1,89 @@
+/*
+ * NVDIMM Firmware Interface Table - NFIT
+ *
+ * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ */
+#ifndef __NFIT_H__
+#define __NFIT_H__
+#include <linux/libnvdimm.h>
+#include <linux/types.h>
+#include <linux/uuid.h>
+#include <linux/acpi.h>
+#include <acpi/acuuid.h>
+
+#define UUID_NFIT_BUS "2f10e7a4-9e91-11e4-89d3-123b93f75cba"
+#define UUID_NFIT_DIMM "4309ac30-0d11-11e4-9191-0800200c9a66"
+
+enum nfit_uuids {
+ NFIT_SPA_VOLATILE,
+ NFIT_SPA_PM,
+ NFIT_SPA_DCR,
+ NFIT_SPA_BDW,
+ NFIT_SPA_VDISK,
+ NFIT_SPA_VCD,
+ NFIT_SPA_PDISK,
+ NFIT_SPA_PCD,
+ NFIT_DEV_BUS,
+ NFIT_DEV_DIMM,
+ NFIT_UUID_MAX,
+};
+
+struct nfit_spa {
+ struct acpi_nfit_system_address *spa;
+ struct list_head list;
+};
+
+struct nfit_dcr {
+ struct acpi_nfit_control_region *dcr;
+ struct list_head list;
+};
+
+struct nfit_bdw {
+ struct acpi_nfit_data_region *bdw;
+ struct list_head list;
+};
+
+struct nfit_memdev {
+ struct acpi_nfit_memory_map *memdev;
+ struct list_head list;
+};
+
+/* assembled tables for a given dimm/memory-device */
+struct nfit_mem {
+ struct acpi_nfit_memory_map *memdev_dcr;
+ struct acpi_nfit_memory_map *memdev_pmem;
+ struct acpi_nfit_control_region *dcr;
+ struct acpi_nfit_data_region *bdw;
+ struct acpi_nfit_system_address *spa_dcr;
+ struct acpi_nfit_system_address *spa_bdw;
+ struct list_head list;
+};
+
+struct acpi_nfit_desc {
+ struct nvdimm_bus_descriptor nd_desc;
+ struct acpi_table_nfit *nfit;
+ struct list_head memdevs;
+ struct list_head dimms;
+ struct list_head spas;
+ struct list_head dcrs;
+ struct list_head bdws;
+ struct nvdimm_bus *nvdimm_bus;
+ struct device *dev;
+};
+
+static inline struct acpi_nfit_memory_map *__to_nfit_memdev(struct nfit_mem *nfit_mem)
+{
+ if (nfit_mem->memdev_dcr)
+ return nfit_mem->memdev_dcr;
+ return nfit_mem->memdev_pmem;
+}
+#endif /* __NFIT_H__ */
diff --git a/drivers/nvdimm/Kconfig b/drivers/nvdimm/Kconfig
new file mode 100644
index 000000000000..24b51dbc8215
--- /dev/null
+++ b/drivers/nvdimm/Kconfig
@@ -0,0 +1,20 @@
+menuconfig NVDIMM_DEVICES
+ bool "NVDIMM (Non-Volatile Memory Device) Support"
+ help
+ Generic support for non-volatile memory devices including
+ ACPI-6-NFIT defined resources. On platforms that define an
+ NFIT, or otherwise can discover NVDIMM resources, a libnvdimm
+ bus is registered to advertise PMEM (persistent memory)
+ namespaces (/dev/pmemX) and BLK (sliding mmio window(s))
+ namespaces (/dev/ndX). A PMEM namespace refers to a memory
+ resource that may span multiple DIMMs and support DAX (see
+ CONFIG_DAX). A BLK namespace refers to an NVDIMM control
+ region which exposes an mmio register set for windowed
+ access mode to non-volatile memory.
+
+if NVDIMM_DEVICES
+
+config LIBNVDIMM
+ tristate
+
+endif
diff --git a/drivers/nvdimm/Makefile b/drivers/nvdimm/Makefile
new file mode 100644
index 000000000000..10bc7af47992
--- /dev/null
+++ b/drivers/nvdimm/Makefile
@@ -0,0 +1,3 @@
+obj-$(CONFIG_LIBNVDIMM) += libnvdimm.o
+
+libnvdimm-y := core.o
diff --git a/drivers/nvdimm/core.c b/drivers/nvdimm/core.c
new file mode 100644
index 000000000000..eeec6dd2fed1
--- /dev/null
+++ b/drivers/nvdimm/core.c
@@ -0,0 +1,67 @@
+/*
+ * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ */
+#include <linux/libnvdimm.h>
+#include <linux/export.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/slab.h>
+#include "nd-private.h"
+
+static DEFINE_IDA(nd_ida);
+
+static void nvdimm_bus_release(struct device *dev)
+{
+ struct nvdimm_bus *nvdimm_bus = container_of(dev, struct nvdimm_bus, dev);
+
+ ida_simple_remove(&nd_ida, nvdimm_bus->id);
+ kfree(nvdimm_bus);
+}
+
+struct nvdimm_bus *nvdimm_bus_register(struct device *parent,
+ struct nvdimm_bus_descriptor *nd_desc)
+{
+ struct nvdimm_bus *nvdimm_bus = kzalloc(sizeof(*nvdimm_bus), GFP_KERNEL);
+ int rc;
+
+ if (!nvdimm_bus)
+ return NULL;
+ nvdimm_bus->id = ida_simple_get(&nd_ida, 0, 0, GFP_KERNEL);
+ if (nvdimm_bus->id < 0) {
+ kfree(nvdimm_bus);
+ return NULL;
+ }
+ nvdimm_bus->nd_desc = nd_desc;
+ nvdimm_bus->dev.parent = parent;
+ nvdimm_bus->dev.release = nvdimm_bus_release;
+ dev_set_name(&nvdimm_bus->dev, "ndbus%d", nvdimm_bus->id);
+ rc = device_register(&nvdimm_bus->dev);
+ if (rc) {
+ dev_dbg(&nvdimm_bus->dev, "device registration failed: %d\n", rc);
+ put_device(&nvdimm_bus->dev);
+ return NULL;
+ }
+
+ return nvdimm_bus;
+}
+EXPORT_SYMBOL_GPL(nvdimm_bus_register);
+
+void nvdimm_bus_unregister(struct nvdimm_bus *nvdimm_bus)
+{
+ if (!nvdimm_bus)
+ return;
+ device_unregister(&nvdimm_bus->dev);
+}
+EXPORT_SYMBOL_GPL(nvdimm_bus_unregister);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Intel Corporation");
diff --git a/drivers/nvdimm/nd-private.h b/drivers/nvdimm/nd-private.h
new file mode 100644
index 000000000000..e7c4e99a22a4
--- /dev/null
+++ b/drivers/nvdimm/nd-private.h
@@ -0,0 +1,23 @@
+/*
+ * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ */
+#ifndef __ND_PRIVATE_H__
+#define __ND_PRIVATE_H__
+#include <linux/libnvdimm.h>
+#include <linux/device.h>
+
+struct nvdimm_bus {
+ struct nvdimm_bus_descriptor *nd_desc;
+ struct device dev;
+ int id;
+};
+#endif /* __ND_PRIVATE_H__ */
diff --git a/include/linux/libnvdimm.h b/include/linux/libnvdimm.h
new file mode 100644
index 000000000000..2b3c63950c91
--- /dev/null
+++ b/include/linux/libnvdimm.h
@@ -0,0 +1,34 @@
+/*
+ * libnvdimm - Non-volatile-memory Devices Subsystem
+ *
+ * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ */
+#ifndef __LIBNVDIMM_H__
+#define __LIBNVDIMM_H__
+struct nvdimm;
+struct nvdimm_bus_descriptor;
+typedef int (*ndctl_fn)(struct nvdimm_bus_descriptor *nd_desc,
+ struct nvdimm *nvdimm, unsigned int cmd, void *buf,
+ unsigned int buf_len);
+
+struct nvdimm_bus_descriptor {
+ unsigned long dsm_mask;
+ char *provider_name;
+ ndctl_fn ndctl;
+};
+
+struct device;
+struct nvdimm_bus;
+struct nvdimm_bus *nvdimm_bus_register(struct device *parent,
+ struct nvdimm_bus_descriptor *nfit_desc);
+void nvdimm_bus_unregister(struct nvdimm_bus *nvdimm_bus);
+#endif /* __LIBNVDIMM_H__ */
^ permalink raw reply related [flat|nested] 47+ messages in thread
* [PATCH v5 03/21] libnvdimm: control character device and libnvdimm bus sysfs attributes
2015-06-02 0:14 [PATCH v5 00/21] libnvdimm: non-volatile memory devices Dan Williams
2015-06-02 0:14 ` [PATCH v5 01/21] e820, efi: add ACPI 6.0 persistent memory types Dan Williams
2015-06-02 0:14 ` [PATCH v5 02/21] libnvdimm, nfit: initial libnvdimm infrastructure and NFIT support Dan Williams
@ 2015-06-02 0:14 ` Dan Williams
2015-06-02 0:14 ` [PATCH v5 04/21] libnvdimm, nfit: dimm/memory-devices Dan Williams
` (17 subsequent siblings)
20 siblings, 0 replies; 47+ messages in thread
From: Dan Williams @ 2015-06-02 0:14 UTC (permalink / raw)
To: linux-nvdimm
Cc: axboe, sfr, rafael, neilb, gregkh, linux-kernel, mingo,
linux-acpi, jmoyer, linux-api, akpm, hch
The control device for a libnvdimm bus is registered as an "nd" class
device. The expectation is that there will usually only be one "nd" bus
registered under /sys/class/nd. However, we allow for the possibility
of multiple buses and they will listed in discovery order as
ndctl0...ndctlN. This character device hosts the ioctl for passing
control messages. The initial command set has a 1:1 correlation with
the commands listed in the by the "NFIT DSM Example" document [1], but
this scheme is extensible to future command sets.
Note, nd_ioctl() and the backing ->ndctl() implementation are defined in
a subsequent patch. This is simply the initial registrations and sysfs
attributes.
[1]: http://pmem.io/documents/NVDIMM_DSM_Interface_Example.pdf
Cc: Neil Brown <neilb@suse.de>
Cc: Greg KH <gregkh@linuxfoundation.org>
Cc: <linux-acpi@vger.kernel.org>
Cc: Robert Moore <robert.moore@intel.com>
Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
drivers/acpi/nfit.c | 28 ++++++++++++++
drivers/acpi/nfit.h | 5 ++
drivers/nvdimm/Makefile | 1
drivers/nvdimm/bus.c | 83 +++++++++++++++++++++++++++++++++++++++++
drivers/nvdimm/core.c | 87 ++++++++++++++++++++++++++++++++++++++++++-
drivers/nvdimm/nd-private.h | 6 +++
include/linux/libnvdimm.h | 6 ++-
7 files changed, 213 insertions(+), 3 deletions(-)
create mode 100644 drivers/nvdimm/bus.c
diff --git a/drivers/acpi/nfit.c b/drivers/acpi/nfit.c
index 314cf9d2522b..ec228ab336b3 100644
--- a/drivers/acpi/nfit.c
+++ b/drivers/acpi/nfit.c
@@ -316,6 +316,33 @@ static int nfit_mem_init(struct acpi_nfit_desc *acpi_desc)
return 0;
}
+static ssize_t revision_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev);
+ struct nvdimm_bus_descriptor *nd_desc = to_nd_desc(nvdimm_bus);
+ struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc);
+
+ return sprintf(buf, "%d\n", acpi_desc->nfit->header.revision);
+}
+static DEVICE_ATTR_RO(revision);
+
+static struct attribute *acpi_nfit_attributes[] = {
+ &dev_attr_revision.attr,
+ NULL,
+};
+
+static struct attribute_group acpi_nfit_attribute_group = {
+ .name = "nfit",
+ .attrs = acpi_nfit_attributes,
+};
+
+static const struct attribute_group *acpi_nfit_attribute_groups[] = {
+ &nvdimm_bus_attribute_group,
+ &acpi_nfit_attribute_group,
+ NULL,
+};
+
static int acpi_nfit_init(struct acpi_nfit_desc *acpi_desc, acpi_size sz)
{
struct device *dev = acpi_desc->dev;
@@ -372,6 +399,7 @@ static int acpi_nfit_add(struct acpi_device *adev)
nd_desc = &acpi_desc->nd_desc;
nd_desc->provider_name = "ACPI.NFIT";
nd_desc->ndctl = acpi_nfit_ctl;
+ nd_desc->attr_groups = acpi_nfit_attribute_groups;
acpi_desc->nvdimm_bus = nvdimm_bus_register(dev, nd_desc);
if (!acpi_desc->nvdimm_bus)
diff --git a/drivers/acpi/nfit.h b/drivers/acpi/nfit.h
index 2d98cc1b7b6c..735e463edbf7 100644
--- a/drivers/acpi/nfit.h
+++ b/drivers/acpi/nfit.h
@@ -86,4 +86,9 @@ static inline struct acpi_nfit_memory_map *__to_nfit_memdev(struct nfit_mem *nfi
return nfit_mem->memdev_dcr;
return nfit_mem->memdev_pmem;
}
+
+static inline struct acpi_nfit_desc *to_acpi_desc(struct nvdimm_bus_descriptor *nd_desc)
+{
+ return container_of(nd_desc, struct acpi_nfit_desc, nd_desc);
+}
#endif /* __NFIT_H__ */
diff --git a/drivers/nvdimm/Makefile b/drivers/nvdimm/Makefile
index 10bc7af47992..8a8293c72c7c 100644
--- a/drivers/nvdimm/Makefile
+++ b/drivers/nvdimm/Makefile
@@ -1,3 +1,4 @@
obj-$(CONFIG_LIBNVDIMM) += libnvdimm.o
libnvdimm-y := core.o
+libnvdimm-y += bus.o
diff --git a/drivers/nvdimm/bus.c b/drivers/nvdimm/bus.c
new file mode 100644
index 000000000000..312caef5b0e9
--- /dev/null
+++ b/drivers/nvdimm/bus.c
@@ -0,0 +1,83 @@
+/*
+ * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/uaccess.h>
+#include <linux/fcntl.h>
+#include <linux/slab.h>
+#include <linux/fs.h>
+#include <linux/io.h>
+#include "nd-private.h"
+
+static int nvdimm_bus_major;
+static struct class *nd_class;
+
+int nvdimm_bus_create_ndctl(struct nvdimm_bus *nvdimm_bus)
+{
+ dev_t devt = MKDEV(nvdimm_bus_major, nvdimm_bus->id);
+ struct device *dev;
+
+ dev = device_create(nd_class, &nvdimm_bus->dev, devt, nvdimm_bus, "ndctl%d",
+ nvdimm_bus->id);
+
+ if (IS_ERR(dev)) {
+ dev_dbg(&nvdimm_bus->dev, "failed to register ndctl%d: %ld\n",
+ nvdimm_bus->id, PTR_ERR(dev));
+ return PTR_ERR(dev);
+ }
+ return 0;
+}
+
+void nvdimm_bus_destroy_ndctl(struct nvdimm_bus *nvdimm_bus)
+{
+ device_destroy(nd_class, MKDEV(nvdimm_bus_major, nvdimm_bus->id));
+}
+
+static long nd_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+ return -ENXIO;
+}
+
+static const struct file_operations nvdimm_bus_fops = {
+ .owner = THIS_MODULE,
+ .open = nonseekable_open,
+ .unlocked_ioctl = nd_ioctl,
+ .compat_ioctl = nd_ioctl,
+ .llseek = noop_llseek,
+};
+
+int __init nvdimm_bus_init(void)
+{
+ int rc;
+
+ rc = register_chrdev(0, "ndctl", &nvdimm_bus_fops);
+ if (rc < 0)
+ return rc;
+ nvdimm_bus_major = rc;
+
+ nd_class = class_create(THIS_MODULE, "nd");
+ if (IS_ERR(nd_class))
+ goto err_class;
+
+ return 0;
+
+ err_class:
+ unregister_chrdev(nvdimm_bus_major, "ndctl");
+
+ return rc;
+}
+
+void __exit nvdimm_bus_exit(void)
+{
+ class_destroy(nd_class);
+ unregister_chrdev(nvdimm_bus_major, "ndctl");
+}
diff --git a/drivers/nvdimm/core.c b/drivers/nvdimm/core.c
index eeec6dd2fed1..86b4da096de1 100644
--- a/drivers/nvdimm/core.c
+++ b/drivers/nvdimm/core.c
@@ -14,9 +14,12 @@
#include <linux/export.h>
#include <linux/module.h>
#include <linux/device.h>
+#include <linux/mutex.h>
#include <linux/slab.h>
#include "nd-private.h"
+static LIST_HEAD(nvdimm_bus_list);
+static DEFINE_MUTEX(nvdimm_bus_list_mutex);
static DEFINE_IDA(nd_ida);
static void nvdimm_bus_release(struct device *dev)
@@ -27,6 +30,54 @@ static void nvdimm_bus_release(struct device *dev)
kfree(nvdimm_bus);
}
+struct nvdimm_bus *to_nvdimm_bus(struct device *dev)
+{
+ struct nvdimm_bus *nvdimm_bus = container_of(dev, struct nvdimm_bus, dev);
+
+ WARN_ON(nvdimm_bus->dev.release != nvdimm_bus_release);
+ return nvdimm_bus;
+}
+EXPORT_SYMBOL_GPL(to_nvdimm_bus);
+
+struct nvdimm_bus_descriptor *to_nd_desc(struct nvdimm_bus *nvdimm_bus)
+{
+ /* struct nvdimm_bus definition is private to libnvdimm */
+ return nvdimm_bus->nd_desc;
+}
+EXPORT_SYMBOL_GPL(to_nd_desc);
+
+static const char *nvdimm_bus_provider(struct nvdimm_bus *nvdimm_bus)
+{
+ struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
+ struct device *parent = nvdimm_bus->dev.parent;
+
+ if (nd_desc->provider_name)
+ return nd_desc->provider_name;
+ else if (parent)
+ return dev_name(parent);
+ else
+ return "unknown";
+}
+
+static ssize_t provider_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev);
+
+ return sprintf(buf, "%s\n", nvdimm_bus_provider(nvdimm_bus));
+}
+static DEVICE_ATTR_RO(provider);
+
+static struct attribute *nvdimm_bus_attributes[] = {
+ &dev_attr_provider.attr,
+ NULL,
+};
+
+struct attribute_group nvdimm_bus_attribute_group = {
+ .attrs = nvdimm_bus_attributes,
+};
+EXPORT_SYMBOL_GPL(nvdimm_bus_attribute_group);
+
struct nvdimm_bus *nvdimm_bus_register(struct device *parent,
struct nvdimm_bus_descriptor *nd_desc)
{
@@ -35,6 +86,7 @@ struct nvdimm_bus *nvdimm_bus_register(struct device *parent,
if (!nvdimm_bus)
return NULL;
+ INIT_LIST_HEAD(&nvdimm_bus->list);
nvdimm_bus->id = ida_simple_get(&nd_ida, 0, 0, GFP_KERNEL);
if (nvdimm_bus->id < 0) {
kfree(nvdimm_bus);
@@ -43,15 +95,26 @@ struct nvdimm_bus *nvdimm_bus_register(struct device *parent,
nvdimm_bus->nd_desc = nd_desc;
nvdimm_bus->dev.parent = parent;
nvdimm_bus->dev.release = nvdimm_bus_release;
+ nvdimm_bus->dev.groups = nd_desc->attr_groups;
dev_set_name(&nvdimm_bus->dev, "ndbus%d", nvdimm_bus->id);
rc = device_register(&nvdimm_bus->dev);
if (rc) {
dev_dbg(&nvdimm_bus->dev, "device registration failed: %d\n", rc);
- put_device(&nvdimm_bus->dev);
- return NULL;
+ goto err;
}
+ rc = nvdimm_bus_create_ndctl(nvdimm_bus);
+ if (rc)
+ goto err;
+
+ mutex_lock(&nvdimm_bus_list_mutex);
+ list_add_tail(&nvdimm_bus->list, &nvdimm_bus_list);
+ mutex_unlock(&nvdimm_bus_list_mutex);
+
return nvdimm_bus;
+ err:
+ put_device(&nvdimm_bus->dev);
+ return NULL;
}
EXPORT_SYMBOL_GPL(nvdimm_bus_register);
@@ -59,9 +122,29 @@ void nvdimm_bus_unregister(struct nvdimm_bus *nvdimm_bus)
{
if (!nvdimm_bus)
return;
+
+ mutex_lock(&nvdimm_bus_list_mutex);
+ list_del_init(&nvdimm_bus->list);
+ mutex_unlock(&nvdimm_bus_list_mutex);
+
+ nvdimm_bus_destroy_ndctl(nvdimm_bus);
+
device_unregister(&nvdimm_bus->dev);
}
EXPORT_SYMBOL_GPL(nvdimm_bus_unregister);
+static __init int libnvdimm_init(void)
+{
+ return nvdimm_bus_init();
+}
+
+static __exit void libnvdimm_exit(void)
+{
+ WARN_ON(!list_empty(&nvdimm_bus_list));
+ nvdimm_bus_exit();
+}
+
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Intel Corporation");
+module_init(libnvdimm_init);
+module_exit(libnvdimm_exit);
diff --git a/drivers/nvdimm/nd-private.h b/drivers/nvdimm/nd-private.h
index e7c4e99a22a4..f31fc3396683 100644
--- a/drivers/nvdimm/nd-private.h
+++ b/drivers/nvdimm/nd-private.h
@@ -17,7 +17,13 @@
struct nvdimm_bus {
struct nvdimm_bus_descriptor *nd_desc;
+ struct list_head list;
struct device dev;
int id;
};
+
+int __init nvdimm_bus_init(void);
+void __exit nvdimm_bus_exit(void);
+int nvdimm_bus_create_ndctl(struct nvdimm_bus *nvdimm_bus);
+void nvdimm_bus_destroy_ndctl(struct nvdimm_bus *nvdimm_bus);
#endif /* __ND_PRIVATE_H__ */
diff --git a/include/linux/libnvdimm.h b/include/linux/libnvdimm.h
index 2b3c63950c91..d375cdc4abd5 100644
--- a/include/linux/libnvdimm.h
+++ b/include/linux/libnvdimm.h
@@ -14,6 +14,8 @@
*/
#ifndef __LIBNVDIMM_H__
#define __LIBNVDIMM_H__
+extern struct attribute_group nvdimm_bus_attribute_group;
+
struct nvdimm;
struct nvdimm_bus_descriptor;
typedef int (*ndctl_fn)(struct nvdimm_bus_descriptor *nd_desc,
@@ -21,14 +23,16 @@ typedef int (*ndctl_fn)(struct nvdimm_bus_descriptor *nd_desc,
unsigned int buf_len);
struct nvdimm_bus_descriptor {
+ const struct attribute_group **attr_groups;
unsigned long dsm_mask;
char *provider_name;
ndctl_fn ndctl;
};
struct device;
-struct nvdimm_bus;
struct nvdimm_bus *nvdimm_bus_register(struct device *parent,
struct nvdimm_bus_descriptor *nfit_desc);
void nvdimm_bus_unregister(struct nvdimm_bus *nvdimm_bus);
+struct nvdimm_bus *to_nvdimm_bus(struct device *dev);
+struct nvdimm_bus_descriptor *to_nd_desc(struct nvdimm_bus *nvdimm_bus);
#endif /* __LIBNVDIMM_H__ */
^ permalink raw reply related [flat|nested] 47+ messages in thread
* [PATCH v5 04/21] libnvdimm, nfit: dimm/memory-devices
2015-06-02 0:14 [PATCH v5 00/21] libnvdimm: non-volatile memory devices Dan Williams
` (2 preceding siblings ...)
2015-06-02 0:14 ` [PATCH v5 03/21] libnvdimm: control character device and libnvdimm bus sysfs attributes Dan Williams
@ 2015-06-02 0:14 ` Dan Williams
2015-06-02 0:14 ` [PATCH v5 05/21] libnvdimm: control (ioctl) messages for libnvdimm bus and dimm devices Dan Williams
` (16 subsequent siblings)
20 siblings, 0 replies; 47+ messages in thread
From: Dan Williams @ 2015-06-02 0:14 UTC (permalink / raw)
To: linux-nvdimm
Cc: axboe, sfr, rafael, neilb, gregkh, linux-kernel, mingo,
linux-acpi, jmoyer, linux-api, akpm, hch
Enable dimm devices to be registered on a libnvdimm bus. The kernel
assigned device id for dimms is dynamic. If userspace needs a more
static identifier it should consult a provider-specific attribute. In
the case where NFIT is the provider, the 'nmemX/nfit/handle' or
'nmemX/nfit/serial' attributes may be used for this purpose.
Cc: Neil Brown <neilb@suse.de>
Cc: <linux-acpi@vger.kernel.org>
Cc: Greg KH <gregkh@linuxfoundation.org>
Cc: Robert Moore <robert.moore@intel.com>
Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
drivers/acpi/nfit.c | 160 +++++++++++++++++++++++++++++++++++++++++++
drivers/acpi/nfit.h | 1
drivers/nvdimm/Makefile | 1
drivers/nvdimm/bus.c | 14 +++-
drivers/nvdimm/core.c | 33 ++++++++-
drivers/nvdimm/dimm_devs.c | 92 +++++++++++++++++++++++++
drivers/nvdimm/nd-private.h | 12 +++
include/linux/libnvdimm.h | 11 +++
8 files changed, 320 insertions(+), 4 deletions(-)
create mode 100644 drivers/nvdimm/dimm_devs.c
diff --git a/drivers/acpi/nfit.c b/drivers/acpi/nfit.c
index ec228ab336b3..a17678b7d74a 100644
--- a/drivers/acpi/nfit.c
+++ b/drivers/acpi/nfit.c
@@ -343,6 +343,164 @@ static const struct attribute_group *acpi_nfit_attribute_groups[] = {
NULL,
};
+static struct acpi_nfit_memory_map *to_nfit_memdev(struct device *dev)
+{
+ struct nvdimm *nvdimm = to_nvdimm(dev);
+ struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
+
+ return __to_nfit_memdev(nfit_mem);
+}
+
+static struct acpi_nfit_control_region *to_nfit_dcr(struct device *dev)
+{
+ struct nvdimm *nvdimm = to_nvdimm(dev);
+ struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
+
+ return nfit_mem->dcr;
+}
+
+static ssize_t handle_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct acpi_nfit_memory_map *memdev = to_nfit_memdev(dev);
+
+ return sprintf(buf, "%#x\n", memdev->device_handle);
+}
+static DEVICE_ATTR_RO(handle);
+
+static ssize_t phys_id_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct acpi_nfit_memory_map *memdev = to_nfit_memdev(dev);
+
+ return sprintf(buf, "%#x\n", memdev->physical_id);
+}
+static DEVICE_ATTR_RO(phys_id);
+
+static ssize_t vendor_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
+
+ return sprintf(buf, "%#x\n", dcr->vendor_id);
+}
+static DEVICE_ATTR_RO(vendor);
+
+static ssize_t rev_id_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
+
+ return sprintf(buf, "%#x\n", dcr->revision_id);
+}
+static DEVICE_ATTR_RO(rev_id);
+
+static ssize_t device_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
+
+ return sprintf(buf, "%#x\n", dcr->device_id);
+}
+static DEVICE_ATTR_RO(device);
+
+static ssize_t format_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
+
+ return sprintf(buf, "%#x\n", dcr->code);
+}
+static DEVICE_ATTR_RO(format);
+
+static ssize_t serial_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
+
+ return sprintf(buf, "%#x\n", dcr->serial_number);
+}
+static DEVICE_ATTR_RO(serial);
+
+static struct attribute *acpi_nfit_dimm_attributes[] = {
+ &dev_attr_handle.attr,
+ &dev_attr_phys_id.attr,
+ &dev_attr_vendor.attr,
+ &dev_attr_device.attr,
+ &dev_attr_format.attr,
+ &dev_attr_serial.attr,
+ &dev_attr_rev_id.attr,
+ NULL,
+};
+
+static umode_t acpi_nfit_dimm_attr_visible(struct kobject *kobj, struct attribute *a, int n)
+{
+ struct device *dev = container_of(kobj, struct device, kobj);
+
+ if (to_nfit_dcr(dev))
+ return a->mode;
+ else
+ return 0;
+}
+
+static struct attribute_group acpi_nfit_dimm_attribute_group = {
+ .name = "nfit",
+ .attrs = acpi_nfit_dimm_attributes,
+ .is_visible = acpi_nfit_dimm_attr_visible,
+};
+
+static const struct attribute_group *acpi_nfit_dimm_attribute_groups[] = {
+ &acpi_nfit_dimm_attribute_group,
+ NULL,
+};
+
+static struct nvdimm *acpi_nfit_dimm_by_handle(struct acpi_nfit_desc *acpi_desc,
+ u32 device_handle)
+{
+ struct nfit_mem *nfit_mem;
+
+ list_for_each_entry(nfit_mem, &acpi_desc->dimms, list)
+ if (__to_nfit_memdev(nfit_mem)->device_handle == device_handle)
+ return nfit_mem->nvdimm;
+
+ return NULL;
+}
+
+static int acpi_nfit_register_dimms(struct acpi_nfit_desc *acpi_desc)
+{
+ struct nfit_mem *nfit_mem;
+
+ list_for_each_entry(nfit_mem, &acpi_desc->dimms, list) {
+ struct nvdimm *nvdimm;
+ unsigned long flags = 0;
+ u32 device_handle;
+
+ device_handle = __to_nfit_memdev(nfit_mem)->device_handle;
+ nvdimm = acpi_nfit_dimm_by_handle(acpi_desc, device_handle);
+ if (nvdimm) {
+ /*
+ * If for some reason we find multiple DCRs the
+ * first one wins
+ */
+ dev_err(acpi_desc->dev, "duplicate DCR detected: %s\n",
+ nvdimm_name(nvdimm));
+ continue;
+ }
+
+ if (nfit_mem->bdw && nfit_mem->memdev_pmem)
+ flags |= NDD_ALIASING;
+
+ nvdimm = nvdimm_create(acpi_desc->nvdimm_bus, nfit_mem,
+ acpi_nfit_dimm_attribute_groups, flags);
+ if (!nvdimm)
+ return -ENOMEM;
+
+ nfit_mem->nvdimm = nvdimm;
+ }
+
+ return 0;
+}
+
static int acpi_nfit_init(struct acpi_nfit_desc *acpi_desc, acpi_size sz)
{
struct device *dev = acpi_desc->dev;
@@ -370,7 +528,7 @@ static int acpi_nfit_init(struct acpi_nfit_desc *acpi_desc, acpi_size sz)
if (nfit_mem_init(acpi_desc) != 0)
return -ENOMEM;
- return 0;
+ return acpi_nfit_register_dimms(acpi_desc);
}
static int acpi_nfit_add(struct acpi_device *adev)
diff --git a/drivers/acpi/nfit.h b/drivers/acpi/nfit.h
index 735e463edbf7..5f1bd10053ce 100644
--- a/drivers/acpi/nfit.h
+++ b/drivers/acpi/nfit.h
@@ -59,6 +59,7 @@ struct nfit_memdev {
/* assembled tables for a given dimm/memory-device */
struct nfit_mem {
+ struct nvdimm *nvdimm;
struct acpi_nfit_memory_map *memdev_dcr;
struct acpi_nfit_memory_map *memdev_pmem;
struct acpi_nfit_control_region *dcr;
diff --git a/drivers/nvdimm/Makefile b/drivers/nvdimm/Makefile
index 8a8293c72c7c..5b68738ba406 100644
--- a/drivers/nvdimm/Makefile
+++ b/drivers/nvdimm/Makefile
@@ -2,3 +2,4 @@ obj-$(CONFIG_LIBNVDIMM) += libnvdimm.o
libnvdimm-y := core.o
libnvdimm-y += bus.o
+libnvdimm-y += dimm_devs.o
diff --git a/drivers/nvdimm/bus.c b/drivers/nvdimm/bus.c
index 312caef5b0e9..a368076c6729 100644
--- a/drivers/nvdimm/bus.c
+++ b/drivers/nvdimm/bus.c
@@ -13,6 +13,7 @@
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/uaccess.h>
#include <linux/fcntl.h>
+#include <linux/async.h>
#include <linux/slab.h>
#include <linux/fs.h>
#include <linux/io.h>
@@ -21,6 +22,10 @@
static int nvdimm_bus_major;
static struct class *nd_class;
+struct bus_type nvdimm_bus_type = {
+ .name = "nd",
+};
+
int nvdimm_bus_create_ndctl(struct nvdimm_bus *nvdimm_bus)
{
dev_t devt = MKDEV(nvdimm_bus_major, nvdimm_bus->id);
@@ -59,9 +64,13 @@ int __init nvdimm_bus_init(void)
{
int rc;
+ rc = bus_register(&nvdimm_bus_type);
+ if (rc)
+ return rc;
+
rc = register_chrdev(0, "ndctl", &nvdimm_bus_fops);
if (rc < 0)
- return rc;
+ goto err_chrdev;
nvdimm_bus_major = rc;
nd_class = class_create(THIS_MODULE, "nd");
@@ -72,6 +81,8 @@ int __init nvdimm_bus_init(void)
err_class:
unregister_chrdev(nvdimm_bus_major, "ndctl");
+ err_chrdev:
+ bus_unregister(&nvdimm_bus_type);
return rc;
}
@@ -80,4 +91,5 @@ void __exit nvdimm_bus_exit(void)
{
class_destroy(nd_class);
unregister_chrdev(nvdimm_bus_major, "ndctl");
+ bus_unregister(&nvdimm_bus_type);
}
diff --git a/drivers/nvdimm/core.c b/drivers/nvdimm/core.c
index 86b4da096de1..45c916fe72dc 100644
--- a/drivers/nvdimm/core.c
+++ b/drivers/nvdimm/core.c
@@ -18,8 +18,8 @@
#include <linux/slab.h>
#include "nd-private.h"
-static LIST_HEAD(nvdimm_bus_list);
-static DEFINE_MUTEX(nvdimm_bus_list_mutex);
+LIST_HEAD(nvdimm_bus_list);
+DEFINE_MUTEX(nvdimm_bus_list_mutex);
static DEFINE_IDA(nd_ida);
static void nvdimm_bus_release(struct device *dev)
@@ -46,6 +46,19 @@ struct nvdimm_bus_descriptor *to_nd_desc(struct nvdimm_bus *nvdimm_bus)
}
EXPORT_SYMBOL_GPL(to_nd_desc);
+struct nvdimm_bus *walk_to_nvdimm_bus(struct device *nd_dev)
+{
+ struct device *dev;
+
+ for (dev = nd_dev; dev; dev = dev->parent)
+ if (dev->release == nvdimm_bus_release)
+ break;
+ dev_WARN_ONCE(nd_dev, !dev, "invalid dev, not on nd bus\n");
+ if (dev)
+ return to_nvdimm_bus(dev);
+ return NULL;
+}
+
static const char *nvdimm_bus_provider(struct nvdimm_bus *nvdimm_bus)
{
struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
@@ -118,6 +131,21 @@ struct nvdimm_bus *nvdimm_bus_register(struct device *parent,
}
EXPORT_SYMBOL_GPL(nvdimm_bus_register);
+static int child_unregister(struct device *dev, void *data)
+{
+ /*
+ * the singular ndctl class device per bus needs to be
+ * "device_destroy"ed, so skip it here
+ *
+ * i.e. remove classless children
+ */
+ if (dev->class)
+ /* pass */;
+ else
+ device_unregister(dev);
+ return 0;
+}
+
void nvdimm_bus_unregister(struct nvdimm_bus *nvdimm_bus)
{
if (!nvdimm_bus)
@@ -127,6 +155,7 @@ void nvdimm_bus_unregister(struct nvdimm_bus *nvdimm_bus)
list_del_init(&nvdimm_bus->list);
mutex_unlock(&nvdimm_bus_list_mutex);
+ device_for_each_child(&nvdimm_bus->dev, NULL, child_unregister);
nvdimm_bus_destroy_ndctl(nvdimm_bus);
device_unregister(&nvdimm_bus->dev);
diff --git a/drivers/nvdimm/dimm_devs.c b/drivers/nvdimm/dimm_devs.c
new file mode 100644
index 000000000000..8246a629f813
--- /dev/null
+++ b/drivers/nvdimm/dimm_devs.c
@@ -0,0 +1,92 @@
+/*
+ * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/device.h>
+#include <linux/slab.h>
+#include <linux/io.h>
+#include <linux/fs.h>
+#include <linux/mm.h>
+#include "nd-private.h"
+
+static DEFINE_IDA(dimm_ida);
+
+static void nvdimm_release(struct device *dev)
+{
+ struct nvdimm *nvdimm = to_nvdimm(dev);
+
+ ida_simple_remove(&dimm_ida, nvdimm->id);
+ kfree(nvdimm);
+}
+
+static struct device_type nvdimm_device_type = {
+ .name = "nvdimm",
+ .release = nvdimm_release,
+};
+
+static bool is_nvdimm(struct device *dev)
+{
+ return dev->type == &nvdimm_device_type;
+}
+
+struct nvdimm *to_nvdimm(struct device *dev)
+{
+ struct nvdimm *nvdimm = container_of(dev, struct nvdimm, dev);
+
+ WARN_ON(!is_nvdimm(dev));
+ return nvdimm;
+}
+EXPORT_SYMBOL_GPL(to_nvdimm);
+
+const char *nvdimm_name(struct nvdimm *nvdimm)
+{
+ return dev_name(&nvdimm->dev);
+}
+EXPORT_SYMBOL_GPL(nvdimm_name);
+
+void *nvdimm_provider_data(struct nvdimm *nvdimm)
+{
+ return nvdimm->provider_data;
+}
+EXPORT_SYMBOL_GPL(nvdimm_provider_data);
+
+struct nvdimm *nvdimm_create(struct nvdimm_bus *nvdimm_bus, void *provider_data,
+ const struct attribute_group **groups, unsigned long flags)
+{
+ struct nvdimm *nvdimm = kzalloc(sizeof(*nvdimm), GFP_KERNEL);
+ struct device *dev;
+
+ if (!nvdimm)
+ return NULL;
+
+ nvdimm->id = ida_simple_get(&dimm_ida, 0, 0, GFP_KERNEL);
+ if (nvdimm->id < 0) {
+ kfree(nvdimm);
+ return NULL;
+ }
+ nvdimm->provider_data = provider_data;
+ nvdimm->flags = flags;
+
+ dev = &nvdimm->dev;
+ dev_set_name(dev, "nmem%d", nvdimm->id);
+ dev->parent = &nvdimm_bus->dev;
+ dev->type = &nvdimm_device_type;
+ dev->bus = &nvdimm_bus_type;
+ dev->groups = groups;
+ if (device_register(dev) != 0) {
+ put_device(dev);
+ return NULL;
+ }
+
+ return nvdimm;
+}
+EXPORT_SYMBOL_GPL(nvdimm_create);
diff --git a/drivers/nvdimm/nd-private.h b/drivers/nvdimm/nd-private.h
index f31fc3396683..f64202747fb7 100644
--- a/drivers/nvdimm/nd-private.h
+++ b/drivers/nvdimm/nd-private.h
@@ -15,6 +15,10 @@
#include <linux/libnvdimm.h>
#include <linux/device.h>
+extern struct list_head nvdimm_bus_list;
+extern struct mutex nvdimm_bus_list_mutex;
+extern struct bus_type nvdimm_bus_type;
+
struct nvdimm_bus {
struct nvdimm_bus_descriptor *nd_desc;
struct list_head list;
@@ -22,6 +26,14 @@ struct nvdimm_bus {
int id;
};
+struct nvdimm {
+ unsigned long flags;
+ void *provider_data;
+ struct device dev;
+ int id;
+};
+
+struct nvdimm_bus *walk_to_nvdimm_bus(struct device *nd_dev);
int __init nvdimm_bus_init(void);
void __exit nvdimm_bus_exit(void);
int nvdimm_bus_create_ndctl(struct nvdimm_bus *nvdimm_bus);
diff --git a/include/linux/libnvdimm.h b/include/linux/libnvdimm.h
index d375cdc4abd5..07787f0dd7de 100644
--- a/include/linux/libnvdimm.h
+++ b/include/linux/libnvdimm.h
@@ -14,6 +14,12 @@
*/
#ifndef __LIBNVDIMM_H__
#define __LIBNVDIMM_H__
+
+enum {
+ /* when a dimm supports both PMEM and BLK access a label is required */
+ NDD_ALIASING = 1 << 0,
+};
+
extern struct attribute_group nvdimm_bus_attribute_group;
struct nvdimm;
@@ -34,5 +40,10 @@ struct nvdimm_bus *nvdimm_bus_register(struct device *parent,
struct nvdimm_bus_descriptor *nfit_desc);
void nvdimm_bus_unregister(struct nvdimm_bus *nvdimm_bus);
struct nvdimm_bus *to_nvdimm_bus(struct device *dev);
+struct nvdimm *to_nvdimm(struct device *dev);
struct nvdimm_bus_descriptor *to_nd_desc(struct nvdimm_bus *nvdimm_bus);
+const char *nvdimm_name(struct nvdimm *nvdimm);
+void *nvdimm_provider_data(struct nvdimm *nvdimm);
+struct nvdimm *nvdimm_create(struct nvdimm_bus *nvdimm_bus, void *provider_data,
+ const struct attribute_group **groups, unsigned long flags);
#endif /* __LIBNVDIMM_H__ */
^ permalink raw reply related [flat|nested] 47+ messages in thread
* [PATCH v5 05/21] libnvdimm: control (ioctl) messages for libnvdimm bus and dimm devices
2015-06-02 0:14 [PATCH v5 00/21] libnvdimm: non-volatile memory devices Dan Williams
` (3 preceding siblings ...)
2015-06-02 0:14 ` [PATCH v5 04/21] libnvdimm, nfit: dimm/memory-devices Dan Williams
@ 2015-06-02 0:14 ` Dan Williams
2015-06-09 6:34 ` Christoph Hellwig
2015-06-02 0:14 ` [PATCH v5 06/21] libnvdimm, nvdimm: dimm driver and base libnvdimm device-driver infrastructure Dan Williams
` (15 subsequent siblings)
20 siblings, 1 reply; 47+ messages in thread
From: Dan Williams @ 2015-06-02 0:14 UTC (permalink / raw)
To: linux-nvdimm
Cc: axboe, sfr, rafael, neilb, gregkh, linux-kernel, mingo,
linux-acpi, jmoyer, linux-api, akpm, hch
Most discovery/configuration of the libnvdimm-subsystem is done via
sysfs attributes. However, some libnvdimm buses, particularly the
ACPI.NFIT bus, define a small set of messages that can be passed to the
platform. For convenience we derive the initial libnvdimm-ioctl command
formats directly from the NFIT DSM Interface Example formats.
ND_CMD_SMART: media health and diagnostics
ND_CMD_GET_CONFIG_SIZE: size of the label space
ND_CMD_GET_CONFIG_DATA: read label space
ND_CMD_SET_CONFIG_DATA: write label space
ND_CMD_VENDOR: vendor-specific command passthrough
ND_CMD_ARS_CAP: report address-range-scrubbing capabilities
ND_CMD_START_ARS: initiate scrubbing
ND_CMD_QUERY_ARS: report on scrubbing state
ND_CMD_SMART_THRESHOLD: configure alarm thresholds for smart events
If a platform later defines different commands than this set it is
straightforward to extend support to those formats.
Most of the commands target a specific dimm. However, the
address-range-scrubbing commands target the bus. The 'commands'
attribute in sysfs of a libnvdimm-bus, or a libnvdimm-nmem enumerate the
supported commands for that object.
Cc: <linux-acpi@vger.kernel.org>
Cc: Robert Moore <robert.moore@intel.com>
Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reported-by: Nicholas Moulin <nicholas.w.moulin@linux.intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
drivers/acpi/Kconfig | 12 ++
drivers/acpi/nfit.c | 213 ++++++++++++++++++++++++++++
drivers/acpi/nfit.h | 3
drivers/nvdimm/bus.c | 324 ++++++++++++++++++++++++++++++++++++++++++-
drivers/nvdimm/core.c | 16 ++
drivers/nvdimm/dimm_devs.c | 38 +++++
drivers/nvdimm/nd-private.h | 3
include/linux/libnvdimm.h | 27 +++-
include/uapi/linux/Kbuild | 1
include/uapi/linux/ndctl.h | 178 ++++++++++++++++++++++++
10 files changed, 805 insertions(+), 10 deletions(-)
create mode 100644 include/uapi/linux/ndctl.h
diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index 3989660ceb8f..f05f8d60d596 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -398,6 +398,18 @@ config ACPI_NFIT
To compile this driver as a module, choose M here:
the module will be called nfit.
+config ACPI_NFIT_DEBUG
+ bool "NFIT DSM debug"
+ depends on ACPI_NFIT
+ depends on DYNAMIC_DEBUG
+ default n
+ help
+ Enabling this option causes the nfit driver to dump the
+ input and output buffers of _DSM operations on the ACPI0012
+ device and its children. This can be very verbose, so leave
+ it disabled unless you are debugging a hardware / firmware
+ issue.
+
source "drivers/acpi/apei/Kconfig"
config ACPI_EXTLOG
diff --git a/drivers/acpi/nfit.c b/drivers/acpi/nfit.c
index a17678b7d74a..da16bbaa3e76 100644
--- a/drivers/acpi/nfit.c
+++ b/drivers/acpi/nfit.c
@@ -13,6 +13,7 @@
#include <linux/list_sort.h>
#include <linux/libnvdimm.h>
#include <linux/module.h>
+#include <linux/ndctl.h>
#include <linux/list.h>
#include <linux/acpi.h>
#include "nfit.h"
@@ -24,11 +25,150 @@ static const u8 *to_nfit_uuid(enum nfit_uuids id)
return nfit_uuid[id];
}
+static struct acpi_nfit_desc *to_acpi_nfit_desc(struct nvdimm_bus_descriptor *nd_desc)
+{
+ return container_of(nd_desc, struct acpi_nfit_desc, nd_desc);
+}
+
+static struct acpi_device *to_acpi_dev(struct acpi_nfit_desc *acpi_desc)
+{
+ struct nvdimm_bus_descriptor *nd_desc = &acpi_desc->nd_desc;
+
+ /*
+ * If provider == 'ACPI.NFIT' we can assume 'dev' is a struct
+ * acpi_device.
+ */
+ if (!nd_desc->provider_name
+ || strcmp(nd_desc->provider_name, "ACPI.NFIT") != 0)
+ return NULL;
+
+ return to_acpi_device(acpi_desc->dev);
+}
+
static int acpi_nfit_ctl(struct nvdimm_bus_descriptor *nd_desc,
struct nvdimm *nvdimm, unsigned int cmd, void *buf,
unsigned int buf_len)
{
- return -ENOTTY;
+ struct acpi_nfit_desc *acpi_desc = to_acpi_nfit_desc(nd_desc);
+ const struct nd_cmd_desc *desc = NULL;
+ union acpi_object in_obj, in_buf, *out_obj;
+ struct device *dev = acpi_desc->dev;
+ const char *cmd_name, *dimm_name;
+ unsigned long dsm_mask;
+ acpi_handle handle;
+ const u8 *uuid;
+ u32 offset;
+ int rc, i;
+
+ if (nvdimm) {
+ struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
+ struct acpi_device *adev = nfit_mem->adev;
+
+ if (!adev)
+ return -ENOTTY;
+ dimm_name = dev_name(&adev->dev);
+ cmd_name = nvdimm_cmd_name(cmd);
+ dsm_mask = nfit_mem->dsm_mask;
+ desc = nd_cmd_dimm_desc(cmd);
+ uuid = to_nfit_uuid(NFIT_DEV_DIMM);
+ handle = adev->handle;
+ } else {
+ struct acpi_device *adev = to_acpi_dev(acpi_desc);
+
+ cmd_name = nvdimm_bus_cmd_name(cmd);
+ dsm_mask = nd_desc->dsm_mask;
+ desc = nd_cmd_bus_desc(cmd);
+ uuid = to_nfit_uuid(NFIT_DEV_BUS);
+ handle = adev->handle;
+ dimm_name = "bus";
+ }
+
+ if (!desc || (cmd && (desc->out_num + desc->in_num == 0)))
+ return -ENOTTY;
+
+ if (!test_bit(cmd, &dsm_mask))
+ return -ENOTTY;
+
+ in_obj.type = ACPI_TYPE_PACKAGE;
+ in_obj.package.count = 1;
+ in_obj.package.elements = &in_buf;
+ in_buf.type = ACPI_TYPE_BUFFER;
+ in_buf.buffer.pointer = buf;
+ in_buf.buffer.length = 0;
+
+ /* libnvdimm has already validated the input envelope */
+ for (i = 0; i < desc->in_num; i++)
+ in_buf.buffer.length += nd_cmd_in_size(nvdimm, cmd, desc, i, buf);
+
+ if (IS_ENABLED(CONFIG_ACPI_NFIT_DEBUG)) {
+ dev_dbg(dev, "%s:%s cmd: %s input length: %d\n", __func__,
+ dimm_name, cmd_name, in_buf.buffer.length);
+ print_hex_dump_debug(cmd_name, DUMP_PREFIX_OFFSET, 4,
+ 4, in_buf.buffer.pointer, min_t(u32, 128,
+ in_buf.buffer.length), true);
+ }
+
+ out_obj = acpi_evaluate_dsm(handle, uuid, 1, cmd, &in_obj);
+ if (!out_obj) {
+ dev_dbg(dev, "%s:%s _DSM failed cmd: %s\n", __func__, dimm_name,
+ cmd_name);
+ return -EINVAL;
+ }
+
+ if (out_obj->package.type != ACPI_TYPE_BUFFER) {
+ dev_dbg(dev, "%s:%s unexpected output object type cmd: %s type: %d\n",
+ __func__, dimm_name, cmd_name, out_obj->type);
+ rc = -EINVAL;
+ goto out;
+ }
+
+ if (IS_ENABLED(CONFIG_ACPI_NFIT_DEBUG)) {
+ dev_dbg(dev, "%s:%s cmd: %s output length: %d\n", __func__,
+ dimm_name, cmd_name, out_obj->buffer.length);
+ print_hex_dump_debug(cmd_name, DUMP_PREFIX_OFFSET, 4,
+ 4, out_obj->buffer.pointer, min_t(u32, 128,
+ out_obj->buffer.length), true);
+ }
+
+ for (i = 0, offset = 0; i < desc->out_num; i++) {
+ u32 out_size = nd_cmd_out_size(nvdimm, cmd, desc, i, buf,
+ (u32 *) out_obj->buffer.pointer);
+
+ if (offset + out_size > out_obj->buffer.length) {
+ dev_dbg(dev, "%s:%s output object underflow cmd: %s field: %d\n",
+ __func__, dimm_name, cmd_name, i);
+ break;
+ }
+
+ if (in_buf.buffer.length + offset + out_size > buf_len) {
+ dev_dbg(dev, "%s:%s output overrun cmd: %s field: %d\n",
+ __func__, dimm_name, cmd_name, i);
+ rc = -ENXIO;
+ goto out;
+ }
+ memcpy(buf + in_buf.buffer.length + offset,
+ out_obj->buffer.pointer + offset, out_size);
+ offset += out_size;
+ }
+ if (offset + in_buf.buffer.length < buf_len) {
+ if (i >= 1) {
+ /*
+ * status valid, return the number of bytes left
+ * unfilled in the output buffer
+ */
+ rc = buf_len - offset - in_buf.buffer.length;
+ } else {
+ dev_err(dev, "%s:%s underrun cmd: %s buf_len: %d out_len: %d\n",
+ __func__, dimm_name, cmd_name, buf_len, offset);
+ rc = -ENXIO;
+ }
+ } else
+ rc = 0;
+
+ out:
+ ACPI_FREE(out_obj);
+
+ return rc;
}
static const char *spa_type_name(u16 type)
@@ -450,6 +590,7 @@ static struct attribute_group acpi_nfit_dimm_attribute_group = {
};
static const struct attribute_group *acpi_nfit_dimm_attribute_groups[] = {
+ &nvdimm_attribute_group,
&acpi_nfit_dimm_attribute_group,
NULL,
};
@@ -466,6 +607,50 @@ static struct nvdimm *acpi_nfit_dimm_by_handle(struct acpi_nfit_desc *acpi_desc,
return NULL;
}
+static int acpi_nfit_add_dimm(struct acpi_nfit_desc *acpi_desc,
+ struct nfit_mem *nfit_mem, u32 device_handle)
+{
+ struct acpi_device *adev, *adev_dimm;
+ struct device *dev = acpi_desc->dev;
+ const u8 *uuid = to_nfit_uuid(NFIT_DEV_DIMM);
+ unsigned long long sta;
+ int i, rc = -ENODEV;
+ acpi_status status;
+
+ nfit_mem->dsm_mask = acpi_desc->dimm_dsm_force_en;
+ adev = to_acpi_dev(acpi_desc);
+ if (!adev)
+ return 0;
+
+ adev_dimm = acpi_find_child_device(adev, device_handle, false);
+ nfit_mem->adev = adev_dimm;
+ if (!adev_dimm) {
+ dev_err(dev, "no ACPI.NFIT device with _ADR %#x, disabling...\n",
+ device_handle);
+ return -ENODEV;
+ }
+
+ status = acpi_evaluate_integer(adev_dimm->handle, "_STA", NULL, &sta);
+ if (status == AE_NOT_FOUND) {
+ dev_dbg(dev, "%s missing _STA, assuming enabled...\n",
+ dev_name(&adev_dimm->dev));
+ rc = 0;
+ } else if (ACPI_FAILURE(status))
+ dev_err(dev, "%s failed to retrieve_STA, disabling...\n",
+ dev_name(&adev_dimm->dev));
+ else if ((sta & ACPI_STA_DEVICE_ENABLED) == 0)
+ dev_info(dev, "%s disabled by firmware\n",
+ dev_name(&adev_dimm->dev));
+ else
+ rc = 0;
+
+ for (i = ND_CMD_SMART; i <= ND_CMD_VENDOR; i++)
+ if (acpi_check_dsm(adev_dimm->handle, uuid, 1, 1ULL << i))
+ set_bit(i, &nfit_mem->dsm_mask);
+
+ return rc;
+}
+
static int acpi_nfit_register_dimms(struct acpi_nfit_desc *acpi_desc)
{
struct nfit_mem *nfit_mem;
@@ -474,6 +659,7 @@ static int acpi_nfit_register_dimms(struct acpi_nfit_desc *acpi_desc)
struct nvdimm *nvdimm;
unsigned long flags = 0;
u32 device_handle;
+ int rc;
device_handle = __to_nfit_memdev(nfit_mem)->device_handle;
nvdimm = acpi_nfit_dimm_by_handle(acpi_desc, device_handle);
@@ -490,8 +676,13 @@ static int acpi_nfit_register_dimms(struct acpi_nfit_desc *acpi_desc)
if (nfit_mem->bdw && nfit_mem->memdev_pmem)
flags |= NDD_ALIASING;
+ rc = acpi_nfit_add_dimm(acpi_desc, nfit_mem, device_handle);
+ if (rc)
+ continue;
+
nvdimm = nvdimm_create(acpi_desc->nvdimm_bus, nfit_mem,
- acpi_nfit_dimm_attribute_groups, flags);
+ acpi_nfit_dimm_attribute_groups,
+ flags, &nfit_mem->dsm_mask);
if (!nvdimm)
return -ENOMEM;
@@ -501,6 +692,22 @@ static int acpi_nfit_register_dimms(struct acpi_nfit_desc *acpi_desc)
return 0;
}
+static void acpi_nfit_init_dsms(struct acpi_nfit_desc *acpi_desc)
+{
+ struct nvdimm_bus_descriptor *nd_desc = &acpi_desc->nd_desc;
+ const u8 *uuid = to_nfit_uuid(NFIT_DEV_BUS);
+ struct acpi_device *adev;
+ int i;
+
+ adev = to_acpi_dev(acpi_desc);
+ if (!adev)
+ return;
+
+ for (i = ND_CMD_ARS_CAP; i <= ND_CMD_ARS_QUERY; i++)
+ if (acpi_check_dsm(adev->handle, uuid, 1, 1ULL << i))
+ set_bit(i, &nd_desc->dsm_mask);
+}
+
static int acpi_nfit_init(struct acpi_nfit_desc *acpi_desc, acpi_size sz)
{
struct device *dev = acpi_desc->dev;
@@ -528,6 +735,8 @@ static int acpi_nfit_init(struct acpi_nfit_desc *acpi_desc, acpi_size sz)
if (nfit_mem_init(acpi_desc) != 0)
return -ENOMEM;
+ acpi_nfit_init_dsms(acpi_desc);
+
return acpi_nfit_register_dimms(acpi_desc);
}
diff --git a/drivers/acpi/nfit.h b/drivers/acpi/nfit.h
index 5f1bd10053ce..3a87042aec77 100644
--- a/drivers/acpi/nfit.h
+++ b/drivers/acpi/nfit.h
@@ -67,6 +67,8 @@ struct nfit_mem {
struct acpi_nfit_system_address *spa_dcr;
struct acpi_nfit_system_address *spa_bdw;
struct list_head list;
+ struct acpi_device *adev;
+ unsigned long dsm_mask;
};
struct acpi_nfit_desc {
@@ -79,6 +81,7 @@ struct acpi_nfit_desc {
struct list_head bdws;
struct nvdimm_bus *nvdimm_bus;
struct device *dev;
+ unsigned long dimm_dsm_force_en;
};
static inline struct acpi_nfit_memory_map *__to_nfit_memdev(struct nfit_mem *nfit_mem)
diff --git a/drivers/nvdimm/bus.c b/drivers/nvdimm/bus.c
index a368076c6729..028e3f110b57 100644
--- a/drivers/nvdimm/bus.c
+++ b/drivers/nvdimm/bus.c
@@ -11,14 +11,18 @@
* General Public License for more details.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/vmalloc.h>
#include <linux/uaccess.h>
#include <linux/fcntl.h>
#include <linux/async.h>
+#include <linux/ndctl.h>
#include <linux/slab.h>
#include <linux/fs.h>
#include <linux/io.h>
+#include <linux/mm.h>
#include "nd-private.h"
+int nvdimm_major;
static int nvdimm_bus_major;
static struct class *nd_class;
@@ -47,19 +51,323 @@ void nvdimm_bus_destroy_ndctl(struct nvdimm_bus *nvdimm_bus)
device_destroy(nd_class, MKDEV(nvdimm_bus_major, nvdimm_bus->id));
}
+static const struct nd_cmd_desc __nd_cmd_dimm_descs[] = {
+ [ND_CMD_IMPLEMENTED] = { },
+ [ND_CMD_SMART] = {
+ .out_num = 2,
+ .out_sizes = { 4, 8, },
+ },
+ [ND_CMD_SMART_THRESHOLD] = {
+ .out_num = 2,
+ .out_sizes = { 4, 8, },
+ },
+ [ND_CMD_DIMM_FLAGS] = {
+ .out_num = 2,
+ .out_sizes = { 4, 4 },
+ },
+ [ND_CMD_GET_CONFIG_SIZE] = {
+ .out_num = 3,
+ .out_sizes = { 4, 4, 4, },
+ },
+ [ND_CMD_GET_CONFIG_DATA] = {
+ .in_num = 2,
+ .in_sizes = { 4, 4, },
+ .out_num = 2,
+ .out_sizes = { 4, UINT_MAX, },
+ },
+ [ND_CMD_SET_CONFIG_DATA] = {
+ .in_num = 3,
+ .in_sizes = { 4, 4, UINT_MAX, },
+ .out_num = 1,
+ .out_sizes = { 4, },
+ },
+ [ND_CMD_VENDOR] = {
+ .in_num = 3,
+ .in_sizes = { 4, 4, UINT_MAX, },
+ .out_num = 3,
+ .out_sizes = { 4, 4, UINT_MAX, },
+ },
+};
+
+const struct nd_cmd_desc *nd_cmd_dimm_desc(int cmd)
+{
+ if (cmd < ARRAY_SIZE(__nd_cmd_dimm_descs))
+ return &__nd_cmd_dimm_descs[cmd];
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(nd_cmd_dimm_desc);
+
+static const struct nd_cmd_desc __nd_cmd_bus_descs[] = {
+ [ND_CMD_IMPLEMENTED] = { },
+ [ND_CMD_ARS_CAP] = {
+ .in_num = 2,
+ .in_sizes = { 8, 8, },
+ .out_num = 2,
+ .out_sizes = { 4, 4, },
+ },
+ [ND_CMD_ARS_START] = {
+ .in_num = 4,
+ .in_sizes = { 8, 8, 2, 6, },
+ .out_num = 1,
+ .out_sizes = { 4, },
+ },
+ [ND_CMD_ARS_QUERY] = {
+ .out_num = 2,
+ .out_sizes = { 4, UINT_MAX, },
+ },
+};
+
+const struct nd_cmd_desc *nd_cmd_bus_desc(int cmd)
+{
+ if (cmd < ARRAY_SIZE(__nd_cmd_bus_descs))
+ return &__nd_cmd_bus_descs[cmd];
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(nd_cmd_bus_desc);
+
+u32 nd_cmd_in_size(struct nvdimm *nvdimm, int cmd,
+ const struct nd_cmd_desc *desc, int idx, void *buf)
+{
+ if (idx >= desc->in_num)
+ return UINT_MAX;
+
+ if (desc->in_sizes[idx] < UINT_MAX)
+ return desc->in_sizes[idx];
+
+ if (nvdimm && cmd == ND_CMD_SET_CONFIG_DATA && idx == 2) {
+ struct nd_cmd_set_config_hdr *hdr = buf;
+
+ return hdr->in_length;
+ } else if (nvdimm && cmd == ND_CMD_VENDOR && idx == 2) {
+ struct nd_cmd_vendor_hdr *hdr = buf;
+
+ return hdr->in_length;
+ }
+
+ return UINT_MAX;
+}
+EXPORT_SYMBOL_GPL(nd_cmd_in_size);
+
+u32 nd_cmd_out_size(struct nvdimm *nvdimm, int cmd,
+ const struct nd_cmd_desc *desc, int idx, const u32 *in_field,
+ const u32 *out_field)
+{
+ if (idx >= desc->out_num)
+ return UINT_MAX;
+
+ if (desc->out_sizes[idx] < UINT_MAX)
+ return desc->out_sizes[idx];
+
+ if (nvdimm && cmd == ND_CMD_GET_CONFIG_DATA && idx == 1)
+ return in_field[1];
+ else if (nvdimm && cmd == ND_CMD_VENDOR && idx == 2)
+ return out_field[1];
+ else if (!nvdimm && cmd == ND_CMD_ARS_QUERY && idx == 1)
+ return ND_CMD_ARS_QUERY_MAX;
+
+ return UINT_MAX;
+}
+EXPORT_SYMBOL_GPL(nd_cmd_out_size);
+
+static int __nd_ioctl(struct nvdimm_bus *nvdimm_bus, struct nvdimm *nvdimm,
+ int read_only, unsigned int ioctl_cmd, unsigned long arg)
+{
+ struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
+ size_t buf_len = 0, in_len = 0, out_len = 0;
+ static char out_env[ND_CMD_MAX_ENVELOPE];
+ static char in_env[ND_CMD_MAX_ENVELOPE];
+ const struct nd_cmd_desc *desc = NULL;
+ unsigned int cmd = _IOC_NR(ioctl_cmd);
+ void __user *p = (void __user *) arg;
+ struct device *dev = &nvdimm_bus->dev;
+ const char *cmd_name, *dimm_name;
+ unsigned long dsm_mask;
+ void *buf;
+ int rc, i;
+
+ if (nvdimm) {
+ desc = nd_cmd_dimm_desc(cmd);
+ cmd_name = nvdimm_cmd_name(cmd);
+ dsm_mask = nvdimm->dsm_mask ? *(nvdimm->dsm_mask) : 0;
+ dimm_name = dev_name(&nvdimm->dev);
+ } else {
+ desc = nd_cmd_bus_desc(cmd);
+ cmd_name = nvdimm_bus_cmd_name(cmd);
+ dsm_mask = nd_desc->dsm_mask;
+ dimm_name = "bus";
+ }
+
+ if (!desc || (desc->out_num + desc->in_num == 0) ||
+ !test_bit(cmd, &dsm_mask))
+ return -ENOTTY;
+
+ /* fail write commands (when read-only) */
+ if (read_only)
+ switch (ioctl_cmd) {
+ case ND_IOCTL_VENDOR:
+ case ND_IOCTL_SET_CONFIG_DATA:
+ case ND_IOCTL_ARS_START:
+ dev_dbg(&nvdimm_bus->dev, "'%s' command while read-only.\n",
+ nvdimm ? nvdimm_cmd_name(cmd)
+ : nvdimm_bus_cmd_name(cmd));
+ return -EPERM;
+ default:
+ break;
+ }
+
+ /* process an input envelope */
+ for (i = 0; i < desc->in_num; i++) {
+ u32 in_size, copy;
+
+ in_size = nd_cmd_in_size(nvdimm, cmd, desc, i, in_env);
+ if (in_size == UINT_MAX) {
+ dev_err(dev, "%s:%s unknown input size cmd: %s field: %d\n",
+ __func__, dimm_name, cmd_name, i);
+ return -ENXIO;
+ }
+ if (!access_ok(VERIFY_READ, p + in_len, in_size))
+ return -EFAULT;
+ if (in_len < sizeof(in_env))
+ copy = min_t(u32, sizeof(in_env) - in_len, in_size);
+ else
+ copy = 0;
+ if (copy && copy_from_user(&in_env[in_len], p + in_len, copy))
+ return -EFAULT;
+ in_len += in_size;
+ }
+
+ /* process an output envelope */
+ for (i = 0; i < desc->out_num; i++) {
+ u32 out_size = nd_cmd_out_size(nvdimm, cmd, desc, i,
+ (u32 *) in_env, (u32 *) out_env);
+ u32 copy;
+
+ if (out_size == UINT_MAX) {
+ dev_dbg(dev, "%s:%s unknown output size cmd: %s field: %d\n",
+ __func__, dimm_name, cmd_name, i);
+ return -EFAULT;
+ }
+ if (!access_ok(VERIFY_WRITE, p + in_len + out_len, out_size))
+ return -EFAULT;
+ if (out_len < sizeof(out_env))
+ copy = min_t(u32, sizeof(out_env) - out_len, out_size);
+ else
+ copy = 0;
+ if (copy && copy_from_user(&out_env[out_len], p + in_len + out_len,
+ copy))
+ return -EFAULT;
+ out_len += out_size;
+ }
+
+ buf_len = out_len + in_len;
+ if (!access_ok(VERIFY_WRITE, p, sizeof(buf_len)))
+ return -EFAULT;
+
+ if (buf_len > ND_IOCTL_MAX_BUFLEN) {
+ dev_dbg(dev, "%s:%s cmd: %s buf_len: %zd > %d\n", __func__,
+ dimm_name, cmd_name, buf_len,
+ ND_IOCTL_MAX_BUFLEN);
+ return -EINVAL;
+ }
+
+ buf = vmalloc(buf_len);
+ if (!buf)
+ return -ENOMEM;
+
+ if (copy_from_user(buf, p, buf_len)) {
+ rc = -EFAULT;
+ goto out;
+ }
+
+ rc = nd_desc->ndctl(nd_desc, nvdimm, cmd, buf, buf_len);
+ if (rc < 0)
+ goto out;
+ if (copy_to_user(p, buf, buf_len))
+ rc = -EFAULT;
+ out:
+ vfree(buf);
+ return rc;
+}
+
static long nd_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
- return -ENXIO;
+ long id = (long) file->private_data;
+ int rc = -ENXIO, read_only;
+ struct nvdimm_bus *nvdimm_bus;
+
+ read_only = (O_RDWR != (file->f_flags & O_ACCMODE));
+ mutex_lock(&nvdimm_bus_list_mutex);
+ list_for_each_entry(nvdimm_bus, &nvdimm_bus_list, list) {
+ if (nvdimm_bus->id == id) {
+ rc = __nd_ioctl(nvdimm_bus, NULL, read_only, cmd, arg);
+ break;
+ }
+ }
+ mutex_unlock(&nvdimm_bus_list_mutex);
+
+ return rc;
+}
+
+static int match_dimm(struct device *dev, void *data)
+{
+ long id = (long) data;
+
+ if (is_nvdimm(dev)) {
+ struct nvdimm *nvdimm = to_nvdimm(dev);
+
+ return nvdimm->id == id;
+ }
+
+ return 0;
+}
+
+static long nvdimm_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+ int rc = -ENXIO, read_only;
+ struct nvdimm_bus *nvdimm_bus;
+
+ read_only = (O_RDWR != (file->f_flags & O_ACCMODE));
+ mutex_lock(&nvdimm_bus_list_mutex);
+ list_for_each_entry(nvdimm_bus, &nvdimm_bus_list, list) {
+ struct device *dev = device_find_child(&nvdimm_bus->dev,
+ file->private_data, match_dimm);
+
+ if (!dev)
+ continue;
+
+ rc = __nd_ioctl(nvdimm_bus, to_nvdimm(dev), read_only, cmd, arg);
+ put_device(dev);
+ break;
+ }
+ mutex_unlock(&nvdimm_bus_list_mutex);
+
+ return rc;
+}
+
+static int nd_open(struct inode *inode, struct file *file)
+{
+ long minor = iminor(inode);
+
+ file->private_data = (void *) minor;
+ return 0;
}
static const struct file_operations nvdimm_bus_fops = {
.owner = THIS_MODULE,
- .open = nonseekable_open,
+ .open = nd_open,
.unlocked_ioctl = nd_ioctl,
.compat_ioctl = nd_ioctl,
.llseek = noop_llseek,
};
+static const struct file_operations nvdimm_fops = {
+ .owner = THIS_MODULE,
+ .open = nd_open,
+ .unlocked_ioctl = nvdimm_ioctl,
+ .compat_ioctl = nvdimm_ioctl,
+ .llseek = noop_llseek,
+};
+
int __init nvdimm_bus_init(void)
{
int rc;
@@ -70,9 +378,14 @@ int __init nvdimm_bus_init(void)
rc = register_chrdev(0, "ndctl", &nvdimm_bus_fops);
if (rc < 0)
- goto err_chrdev;
+ goto err_bus_chrdev;
nvdimm_bus_major = rc;
+ rc = register_chrdev(0, "dimmctl", &nvdimm_fops);
+ if (rc < 0)
+ goto err_dimm_chrdev;
+ nvdimm_major = rc;
+
nd_class = class_create(THIS_MODULE, "nd");
if (IS_ERR(nd_class))
goto err_class;
@@ -80,8 +393,10 @@ int __init nvdimm_bus_init(void)
return 0;
err_class:
+ unregister_chrdev(nvdimm_major, "dimmctl");
+ err_dimm_chrdev:
unregister_chrdev(nvdimm_bus_major, "ndctl");
- err_chrdev:
+ err_bus_chrdev:
bus_unregister(&nvdimm_bus_type);
return rc;
@@ -91,5 +406,6 @@ void __exit nvdimm_bus_exit(void)
{
class_destroy(nd_class);
unregister_chrdev(nvdimm_bus_major, "ndctl");
+ unregister_chrdev(nvdimm_major, "dimmctl");
bus_unregister(&nvdimm_bus_type);
}
diff --git a/drivers/nvdimm/core.c b/drivers/nvdimm/core.c
index 45c916fe72dc..fb1568794217 100644
--- a/drivers/nvdimm/core.c
+++ b/drivers/nvdimm/core.c
@@ -14,6 +14,7 @@
#include <linux/export.h>
#include <linux/module.h>
#include <linux/device.h>
+#include <linux/ndctl.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#include "nd-private.h"
@@ -59,6 +60,20 @@ struct nvdimm_bus *walk_to_nvdimm_bus(struct device *nd_dev)
return NULL;
}
+static ssize_t commands_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ int cmd, len = 0;
+ struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev);
+ struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
+
+ for_each_set_bit(cmd, &nd_desc->dsm_mask, BITS_PER_LONG)
+ len += sprintf(buf + len, "%s ", nvdimm_bus_cmd_name(cmd));
+ len += sprintf(buf + len, "\n");
+ return len;
+}
+static DEVICE_ATTR_RO(commands);
+
static const char *nvdimm_bus_provider(struct nvdimm_bus *nvdimm_bus)
{
struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
@@ -82,6 +97,7 @@ static ssize_t provider_show(struct device *dev,
static DEVICE_ATTR_RO(provider);
static struct attribute *nvdimm_bus_attributes[] = {
+ &dev_attr_commands.attr,
&dev_attr_provider.attr,
NULL,
};
diff --git a/drivers/nvdimm/dimm_devs.c b/drivers/nvdimm/dimm_devs.c
index 8246a629f813..100d682ead08 100644
--- a/drivers/nvdimm/dimm_devs.c
+++ b/drivers/nvdimm/dimm_devs.c
@@ -12,6 +12,7 @@
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/device.h>
+#include <linux/ndctl.h>
#include <linux/slab.h>
#include <linux/io.h>
#include <linux/fs.h>
@@ -33,7 +34,7 @@ static struct device_type nvdimm_device_type = {
.release = nvdimm_release,
};
-static bool is_nvdimm(struct device *dev)
+bool is_nvdimm(struct device *dev)
{
return dev->type == &nvdimm_device_type;
}
@@ -55,12 +56,41 @@ EXPORT_SYMBOL_GPL(nvdimm_name);
void *nvdimm_provider_data(struct nvdimm *nvdimm)
{
- return nvdimm->provider_data;
+ if (nvdimm)
+ return nvdimm->provider_data;
+ return NULL;
}
EXPORT_SYMBOL_GPL(nvdimm_provider_data);
+static ssize_t commands_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct nvdimm *nvdimm = to_nvdimm(dev);
+ int cmd, len = 0;
+
+ if (!nvdimm->dsm_mask)
+ return sprintf(buf, "\n");
+
+ for_each_set_bit(cmd, nvdimm->dsm_mask, BITS_PER_LONG)
+ len += sprintf(buf + len, "%s ", nvdimm_cmd_name(cmd));
+ len += sprintf(buf + len, "\n");
+ return len;
+}
+static DEVICE_ATTR_RO(commands);
+
+static struct attribute *nvdimm_attributes[] = {
+ &dev_attr_commands.attr,
+ NULL,
+};
+
+struct attribute_group nvdimm_attribute_group = {
+ .attrs = nvdimm_attributes,
+};
+EXPORT_SYMBOL_GPL(nvdimm_attribute_group);
+
struct nvdimm *nvdimm_create(struct nvdimm_bus *nvdimm_bus, void *provider_data,
- const struct attribute_group **groups, unsigned long flags)
+ const struct attribute_group **groups, unsigned long flags,
+ unsigned long *dsm_mask)
{
struct nvdimm *nvdimm = kzalloc(sizeof(*nvdimm), GFP_KERNEL);
struct device *dev;
@@ -75,12 +105,14 @@ struct nvdimm *nvdimm_create(struct nvdimm_bus *nvdimm_bus, void *provider_data,
}
nvdimm->provider_data = provider_data;
nvdimm->flags = flags;
+ nvdimm->dsm_mask = dsm_mask;
dev = &nvdimm->dev;
dev_set_name(dev, "nmem%d", nvdimm->id);
dev->parent = &nvdimm_bus->dev;
dev->type = &nvdimm_device_type;
dev->bus = &nvdimm_bus_type;
+ dev->devt = MKDEV(nvdimm_major, nvdimm->id);
dev->groups = groups;
if (device_register(dev) != 0) {
put_device(dev);
diff --git a/drivers/nvdimm/nd-private.h b/drivers/nvdimm/nd-private.h
index f64202747fb7..95c4363884a5 100644
--- a/drivers/nvdimm/nd-private.h
+++ b/drivers/nvdimm/nd-private.h
@@ -18,6 +18,7 @@
extern struct list_head nvdimm_bus_list;
extern struct mutex nvdimm_bus_list_mutex;
extern struct bus_type nvdimm_bus_type;
+extern int nvdimm_major;
struct nvdimm_bus {
struct nvdimm_bus_descriptor *nd_desc;
@@ -29,10 +30,12 @@ struct nvdimm_bus {
struct nvdimm {
unsigned long flags;
void *provider_data;
+ unsigned long *dsm_mask;
struct device dev;
int id;
};
+bool is_nvdimm(struct device *dev);
struct nvdimm_bus *walk_to_nvdimm_bus(struct device *nd_dev);
int __init nvdimm_bus_init(void);
void __exit nvdimm_bus_exit(void);
diff --git a/include/linux/libnvdimm.h b/include/linux/libnvdimm.h
index 07787f0dd7de..2cfd6db58b54 100644
--- a/include/linux/libnvdimm.h
+++ b/include/linux/libnvdimm.h
@@ -14,13 +14,22 @@
*/
#ifndef __LIBNVDIMM_H__
#define __LIBNVDIMM_H__
+#include <linux/sizes.h>
+#include <linux/types.h>
enum {
/* when a dimm supports both PMEM and BLK access a label is required */
NDD_ALIASING = 1 << 0,
+
+ /* need to set a limit somewhere, but yes, this is likely overkill */
+ ND_IOCTL_MAX_BUFLEN = SZ_4M,
+ ND_CMD_MAX_ELEM = 4,
+ ND_CMD_MAX_ENVELOPE = 16,
+ ND_CMD_ARS_QUERY_MAX = SZ_4K,
};
extern struct attribute_group nvdimm_bus_attribute_group;
+extern struct attribute_group nvdimm_attribute_group;
struct nvdimm;
struct nvdimm_bus_descriptor;
@@ -35,6 +44,14 @@ struct nvdimm_bus_descriptor {
ndctl_fn ndctl;
};
+struct nd_cmd_desc {
+ int in_num;
+ int out_num;
+ u32 in_sizes[ND_CMD_MAX_ELEM];
+ int out_sizes[ND_CMD_MAX_ELEM];
+};
+
+struct nvdimm_bus;
struct device;
struct nvdimm_bus *nvdimm_bus_register(struct device *parent,
struct nvdimm_bus_descriptor *nfit_desc);
@@ -45,5 +62,13 @@ struct nvdimm_bus_descriptor *to_nd_desc(struct nvdimm_bus *nvdimm_bus);
const char *nvdimm_name(struct nvdimm *nvdimm);
void *nvdimm_provider_data(struct nvdimm *nvdimm);
struct nvdimm *nvdimm_create(struct nvdimm_bus *nvdimm_bus, void *provider_data,
- const struct attribute_group **groups, unsigned long flags);
+ const struct attribute_group **groups, unsigned long flags,
+ unsigned long *dsm_mask);
+const struct nd_cmd_desc *nd_cmd_dimm_desc(int cmd);
+const struct nd_cmd_desc *nd_cmd_bus_desc(int cmd);
+u32 nd_cmd_in_size(struct nvdimm *nvdimm, int cmd,
+ const struct nd_cmd_desc *desc, int idx, void *buf);
+u32 nd_cmd_out_size(struct nvdimm *nvdimm, int cmd,
+ const struct nd_cmd_desc *desc, int idx, const u32 *in_field,
+ const u32 *out_field);
#endif /* __LIBNVDIMM_H__ */
diff --git a/include/uapi/linux/Kbuild b/include/uapi/linux/Kbuild
index 1a0006a76b00..200cc5ea2998 100644
--- a/include/uapi/linux/Kbuild
+++ b/include/uapi/linux/Kbuild
@@ -271,6 +271,7 @@ header-y += ncp_fs.h
header-y += ncp.h
header-y += ncp_mount.h
header-y += ncp_no.h
+header-y += ndctl.h
header-y += neighbour.h
header-y += netconf.h
header-y += netdevice.h
diff --git a/include/uapi/linux/ndctl.h b/include/uapi/linux/ndctl.h
new file mode 100644
index 000000000000..865dbfe8b99d
--- /dev/null
+++ b/include/uapi/linux/ndctl.h
@@ -0,0 +1,178 @@
+/*
+ * Copyright (c) 2014-2015, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU Lesser General Public License,
+ * version 2.1, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
+ * more details.
+ */
+#ifndef __NDCTL_H__
+#define __NDCTL_H__
+
+#include <linux/types.h>
+
+struct nd_cmd_smart {
+ __u32 status;
+ __u8 data[128];
+} __packed;
+
+struct nd_cmd_smart_threshold {
+ __u32 status;
+ __u8 data[8];
+} __packed;
+
+struct nd_cmd_dimm_flags {
+ __u32 status;
+ __u32 flags;
+} __packed;
+
+struct nd_cmd_get_config_size {
+ __u32 status;
+ __u32 config_size;
+ __u32 max_xfer;
+} __packed;
+
+struct nd_cmd_get_config_data_hdr {
+ __u32 in_offset;
+ __u32 in_length;
+ __u32 status;
+ __u8 out_buf[0];
+} __packed;
+
+struct nd_cmd_set_config_hdr {
+ __u32 in_offset;
+ __u32 in_length;
+ __u8 in_buf[0];
+} __packed;
+
+struct nd_cmd_vendor_hdr {
+ __u32 opcode;
+ __u32 in_length;
+ __u8 in_buf[0];
+} __packed;
+
+struct nd_cmd_vendor_tail {
+ __u32 status;
+ __u32 out_length;
+ __u8 out_buf[0];
+} __packed;
+
+struct nd_cmd_ars_cap {
+ __u64 address;
+ __u64 length;
+ __u32 status;
+ __u32 max_ars_out;
+} __packed;
+
+struct nd_cmd_ars_start {
+ __u64 address;
+ __u64 length;
+ __u16 type;
+ __u8 reserved[6];
+ __u32 status;
+} __packed;
+
+struct nd_cmd_ars_query {
+ __u32 status;
+ __u32 out_length;
+ __u64 address;
+ __u64 length;
+ __u16 type;
+ __u32 num_records;
+ struct nd_ars_record {
+ __u32 handle;
+ __u32 flags;
+ __u64 err_address;
+ __u64 mask;
+ } __packed records[0];
+} __packed;
+
+enum {
+ ND_CMD_IMPLEMENTED = 0,
+
+ /* bus commands */
+ ND_CMD_ARS_CAP = 1,
+ ND_CMD_ARS_START = 2,
+ ND_CMD_ARS_QUERY = 3,
+
+ /* per-dimm commands */
+ ND_CMD_SMART = 1,
+ ND_CMD_SMART_THRESHOLD = 2,
+ ND_CMD_DIMM_FLAGS = 3,
+ ND_CMD_GET_CONFIG_SIZE = 4,
+ ND_CMD_GET_CONFIG_DATA = 5,
+ ND_CMD_SET_CONFIG_DATA = 6,
+ ND_CMD_VENDOR_EFFECT_LOG_SIZE = 7,
+ ND_CMD_VENDOR_EFFECT_LOG = 8,
+ ND_CMD_VENDOR = 9,
+};
+
+static inline const char *nvdimm_bus_cmd_name(unsigned cmd)
+{
+ static const char * const names[] = {
+ [ND_CMD_ARS_CAP] = "ars_cap",
+ [ND_CMD_ARS_START] = "ars_start",
+ [ND_CMD_ARS_QUERY] = "ars_query",
+ };
+
+ if (cmd < ARRAY_SIZE(names) && names[cmd])
+ return names[cmd];
+ return "unknown";
+}
+
+static inline const char *nvdimm_cmd_name(unsigned cmd)
+{
+ static const char * const names[] = {
+ [ND_CMD_SMART] = "smart",
+ [ND_CMD_SMART_THRESHOLD] = "smart_thresh",
+ [ND_CMD_DIMM_FLAGS] = "flags",
+ [ND_CMD_GET_CONFIG_SIZE] = "get_size",
+ [ND_CMD_GET_CONFIG_DATA] = "get_data",
+ [ND_CMD_SET_CONFIG_DATA] = "set_data",
+ [ND_CMD_VENDOR_EFFECT_LOG_SIZE] = "effect_size",
+ [ND_CMD_VENDOR_EFFECT_LOG] = "effect_log",
+ [ND_CMD_VENDOR] = "vendor",
+ };
+
+ if (cmd < ARRAY_SIZE(names) && names[cmd])
+ return names[cmd];
+ return "unknown";
+}
+
+#define ND_IOCTL 'N'
+
+#define ND_IOCTL_SMART _IOWR(ND_IOCTL, ND_CMD_SMART,\
+ struct nd_cmd_smart)
+
+#define ND_IOCTL_SMART_THRESHOLD _IOWR(ND_IOCTL, ND_CMD_SMART_THRESHOLD,\
+ struct nd_cmd_smart_threshold)
+
+#define ND_IOCTL_DIMM_FLAGS _IOWR(ND_IOCTL, ND_CMD_DIMM_FLAGS,\
+ struct nd_cmd_dimm_flags)
+
+#define ND_IOCTL_GET_CONFIG_SIZE _IOWR(ND_IOCTL, ND_CMD_GET_CONFIG_SIZE,\
+ struct nd_cmd_get_config_size)
+
+#define ND_IOCTL_GET_CONFIG_DATA _IOWR(ND_IOCTL, ND_CMD_GET_CONFIG_DATA,\
+ struct nd_cmd_get_config_data_hdr)
+
+#define ND_IOCTL_SET_CONFIG_DATA _IOWR(ND_IOCTL, ND_CMD_SET_CONFIG_DATA,\
+ struct nd_cmd_set_config_hdr)
+
+#define ND_IOCTL_VENDOR _IOWR(ND_IOCTL, ND_CMD_VENDOR,\
+ struct nd_cmd_vendor_hdr)
+
+#define ND_IOCTL_ARS_CAP _IOWR(ND_IOCTL, ND_CMD_ARS_CAP,\
+ struct nd_cmd_ars_cap)
+
+#define ND_IOCTL_ARS_START _IOWR(ND_IOCTL, ND_CMD_ARS_START,\
+ struct nd_cmd_ars_start)
+
+#define ND_IOCTL_ARS_QUERY _IOWR(ND_IOCTL, ND_CMD_ARS_QUERY,\
+ struct nd_cmd_ars_query)
+
+#endif /* __NDCTL_H__ */
^ permalink raw reply related [flat|nested] 47+ messages in thread
* [PATCH v5 06/21] libnvdimm, nvdimm: dimm driver and base libnvdimm device-driver infrastructure
2015-06-02 0:14 [PATCH v5 00/21] libnvdimm: non-volatile memory devices Dan Williams
` (4 preceding siblings ...)
2015-06-02 0:14 ` [PATCH v5 05/21] libnvdimm: control (ioctl) messages for libnvdimm bus and dimm devices Dan Williams
@ 2015-06-02 0:14 ` Dan Williams
2015-06-02 0:14 ` [PATCH v5 07/21] libnvdimm, nfit: regions (block-data-window, persistent memory, volatile memory) Dan Williams
` (14 subsequent siblings)
20 siblings, 0 replies; 47+ messages in thread
From: Dan Williams @ 2015-06-02 0:14 UTC (permalink / raw)
To: linux-nvdimm
Cc: axboe, sfr, rafael, neilb, gregkh, linux-kernel, mingo,
linux-acpi, jmoyer, linux-api, akpm, hch
* Implement the device-model infrastructure for loading modules and
attaching drivers to nvdimm devices. This is a simple association of a
nd-device-type number with a driver that has a bitmask of supported
device types. To facilitate userspace bind/unbind operations 'modalias'
and 'devtype', that also appear in the uevent, are added as generic
sysfs attributes for all nvdimm devices. The reason for the device-type
number is to support sub-types within a given parent devtype, be it a
vendor-specific sub-type or otherwise.
* The first consumer of this infrastructure is the driver
for dimm devices. It simply uses control messages to retrieve and
store the configuration-data image (label set) from each dimm.
Note: nd_device_register() arranges for asynchronous registration of
nvdimm bus devices by default.
Cc: Greg KH <gregkh@linuxfoundation.org>
Cc: Neil Brown <neilb@suse.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
drivers/acpi/nfit.c | 13 +++
drivers/nvdimm/Makefile | 1
drivers/nvdimm/bus.c | 168 ++++++++++++++++++++++++++++++++++++++++++-
drivers/nvdimm/core.c | 43 ++++++++++-
drivers/nvdimm/dimm.c | 92 ++++++++++++++++++++++++
drivers/nvdimm/dimm_devs.c | 136 ++++++++++++++++++++++++++++++++++-
drivers/nvdimm/nd-private.h | 6 +-
drivers/nvdimm/nd.h | 36 +++++++++
include/linux/libnvdimm.h | 2 +
include/linux/nd.h | 39 ++++++++++
include/uapi/linux/ndctl.h | 6 ++
11 files changed, 527 insertions(+), 15 deletions(-)
create mode 100644 drivers/nvdimm/dimm.c
create mode 100644 drivers/nvdimm/nd.h
create mode 100644 include/linux/nd.h
diff --git a/drivers/acpi/nfit.c b/drivers/acpi/nfit.c
index da16bbaa3e76..1bec597107d2 100644
--- a/drivers/acpi/nfit.c
+++ b/drivers/acpi/nfit.c
@@ -18,6 +18,10 @@
#include <linux/acpi.h>
#include "nfit.h"
+static bool force_enable_dimms;
+module_param(force_enable_dimms, bool, S_IRUGO|S_IWUSR);
+MODULE_PARM_DESC(force_enable_dimms, "Ignore _STA (ACPI DIMM device) status");
+
static u8 nfit_uuid[NFIT_UUID_MAX][16];
static const u8 *to_nfit_uuid(enum nfit_uuids id)
@@ -591,6 +595,7 @@ static struct attribute_group acpi_nfit_dimm_attribute_group = {
static const struct attribute_group *acpi_nfit_dimm_attribute_groups[] = {
&nvdimm_attribute_group,
+ &nd_device_attribute_group,
&acpi_nfit_dimm_attribute_group,
NULL,
};
@@ -627,7 +632,7 @@ static int acpi_nfit_add_dimm(struct acpi_nfit_desc *acpi_desc,
if (!adev_dimm) {
dev_err(dev, "no ACPI.NFIT device with _ADR %#x, disabling...\n",
device_handle);
- return -ENODEV;
+ return force_enable_dimms ? 0 : -ENODEV;
}
status = acpi_evaluate_integer(adev_dimm->handle, "_STA", NULL, &sta);
@@ -648,12 +653,13 @@ static int acpi_nfit_add_dimm(struct acpi_nfit_desc *acpi_desc,
if (acpi_check_dsm(adev_dimm->handle, uuid, 1, 1ULL << i))
set_bit(i, &nfit_mem->dsm_mask);
- return rc;
+ return force_enable_dimms ? 0 : rc;
}
static int acpi_nfit_register_dimms(struct acpi_nfit_desc *acpi_desc)
{
struct nfit_mem *nfit_mem;
+ int dimm_count = 0;
list_for_each_entry(nfit_mem, &acpi_desc->dimms, list) {
struct nvdimm *nvdimm;
@@ -687,9 +693,10 @@ static int acpi_nfit_register_dimms(struct acpi_nfit_desc *acpi_desc)
return -ENOMEM;
nfit_mem->nvdimm = nvdimm;
+ dimm_count++;
}
- return 0;
+ return nvdimm_bus_validate_dimm_count(acpi_desc->nvdimm_bus, dimm_count);
}
static void acpi_nfit_init_dsms(struct acpi_nfit_desc *acpi_desc)
diff --git a/drivers/nvdimm/Makefile b/drivers/nvdimm/Makefile
index 5b68738ba406..d44b5c1fcd3b 100644
--- a/drivers/nvdimm/Makefile
+++ b/drivers/nvdimm/Makefile
@@ -3,3 +3,4 @@ obj-$(CONFIG_LIBNVDIMM) += libnvdimm.o
libnvdimm-y := core.o
libnvdimm-y += bus.o
libnvdimm-y += dimm_devs.o
+libnvdimm-y += dimm.o
diff --git a/drivers/nvdimm/bus.c b/drivers/nvdimm/bus.c
index 028e3f110b57..03861550c586 100644
--- a/drivers/nvdimm/bus.c
+++ b/drivers/nvdimm/bus.c
@@ -16,19 +16,183 @@
#include <linux/fcntl.h>
#include <linux/async.h>
#include <linux/ndctl.h>
+#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/fs.h>
#include <linux/io.h>
#include <linux/mm.h>
+#include <linux/nd.h>
#include "nd-private.h"
+#include "nd.h"
int nvdimm_major;
static int nvdimm_bus_major;
static struct class *nd_class;
-struct bus_type nvdimm_bus_type = {
+static int to_nd_device_type(struct device *dev)
+{
+ if (is_nvdimm(dev))
+ return ND_DEVICE_DIMM;
+
+ return 0;
+}
+
+static int nvdimm_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
+{
+ return add_uevent_var(env, "MODALIAS=" ND_DEVICE_MODALIAS_FMT,
+ to_nd_device_type(dev));
+}
+
+static int nvdimm_bus_match(struct device *dev, struct device_driver *drv)
+{
+ struct nd_device_driver *nd_drv = to_nd_device_driver(drv);
+
+ return test_bit(to_nd_device_type(dev), &nd_drv->type);
+}
+
+static int nvdimm_bus_probe(struct device *dev)
+{
+ struct nd_device_driver *nd_drv = to_nd_device_driver(dev->driver);
+ struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
+ int rc;
+
+ rc = nd_drv->probe(dev);
+ dev_dbg(&nvdimm_bus->dev, "%s.probe(%s) = %d\n", dev->driver->name,
+ dev_name(dev), rc);
+ return rc;
+}
+
+static int nvdimm_bus_remove(struct device *dev)
+{
+ struct nd_device_driver *nd_drv = to_nd_device_driver(dev->driver);
+ struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
+ int rc;
+
+ rc = nd_drv->remove(dev);
+ dev_dbg(&nvdimm_bus->dev, "%s.remove(%s) = %d\n", dev->driver->name,
+ dev_name(dev), rc);
+ return rc;
+}
+
+static struct bus_type nvdimm_bus_type = {
.name = "nd",
+ .uevent = nvdimm_bus_uevent,
+ .match = nvdimm_bus_match,
+ .probe = nvdimm_bus_probe,
+ .remove = nvdimm_bus_remove,
+};
+
+static ASYNC_DOMAIN_EXCLUSIVE(nd_async_domain);
+
+void nd_synchronize(void)
+{
+ async_synchronize_full_domain(&nd_async_domain);
+}
+EXPORT_SYMBOL_GPL(nd_synchronize);
+
+static void nd_async_device_register(void *d, async_cookie_t cookie)
+{
+ struct device *dev = d;
+
+ if (device_add(dev) != 0) {
+ dev_err(dev, "%s: failed\n", __func__);
+ put_device(dev);
+ }
+ put_device(dev);
+}
+
+static void nd_async_device_unregister(void *d, async_cookie_t cookie)
+{
+ struct device *dev = d;
+
+ device_unregister(dev);
+ put_device(dev);
+}
+
+void nd_device_register(struct device *dev)
+{
+ dev->bus = &nvdimm_bus_type;
+ device_initialize(dev);
+ get_device(dev);
+ async_schedule_domain(nd_async_device_register, dev,
+ &nd_async_domain);
+}
+EXPORT_SYMBOL(nd_device_register);
+
+void nd_device_unregister(struct device *dev, enum nd_async_mode mode)
+{
+ switch (mode) {
+ case ND_ASYNC:
+ get_device(dev);
+ async_schedule_domain(nd_async_device_unregister, dev,
+ &nd_async_domain);
+ break;
+ case ND_SYNC:
+ nd_synchronize();
+ device_unregister(dev);
+ break;
+ }
+}
+EXPORT_SYMBOL(nd_device_unregister);
+
+/**
+ * __nd_driver_register() - register a region or a namespace driver
+ * @nd_drv: driver to register
+ * @owner: automatically set by nd_driver_register() macro
+ * @mod_name: automatically set by nd_driver_register() macro
+ */
+int __nd_driver_register(struct nd_device_driver *nd_drv, struct module *owner,
+ const char *mod_name)
+{
+ struct device_driver *drv = &nd_drv->drv;
+
+ if (!nd_drv->type) {
+ pr_debug("driver type bitmask not set (%pf)\n",
+ __builtin_return_address(0));
+ return -EINVAL;
+ }
+
+ if (!nd_drv->probe || !nd_drv->remove) {
+ pr_debug("->probe() and ->remove() must be specified\n");
+ return -EINVAL;
+ }
+
+ drv->bus = &nvdimm_bus_type;
+ drv->owner = owner;
+ drv->mod_name = mod_name;
+
+ return driver_register(drv);
+}
+EXPORT_SYMBOL(__nd_driver_register);
+
+static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ return sprintf(buf, ND_DEVICE_MODALIAS_FMT "\n",
+ to_nd_device_type(dev));
+}
+static DEVICE_ATTR_RO(modalias);
+
+static ssize_t devtype_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ return sprintf(buf, "%s\n", dev->type->name);
+}
+static DEVICE_ATTR_RO(devtype);
+
+static struct attribute *nd_device_attributes[] = {
+ &dev_attr_modalias.attr,
+ &dev_attr_devtype.attr,
+ NULL,
+};
+
+/**
+ * nd_device_attribute_group - generic attributes for all devices on an nd bus
+ */
+struct attribute_group nd_device_attribute_group = {
+ .attrs = nd_device_attributes,
};
+EXPORT_SYMBOL_GPL(nd_device_attribute_group);
int nvdimm_bus_create_ndctl(struct nvdimm_bus *nvdimm_bus)
{
@@ -402,7 +566,7 @@ int __init nvdimm_bus_init(void)
return rc;
}
-void __exit nvdimm_bus_exit(void)
+void nvdimm_bus_exit(void)
{
class_destroy(nd_class);
unregister_chrdev(nvdimm_bus_major, "ndctl");
diff --git a/drivers/nvdimm/core.c b/drivers/nvdimm/core.c
index fb1568794217..3e11cea4b0b8 100644
--- a/drivers/nvdimm/core.c
+++ b/drivers/nvdimm/core.c
@@ -18,6 +18,7 @@
#include <linux/mutex.h>
#include <linux/slab.h>
#include "nd-private.h"
+#include "nd.h"
LIST_HEAD(nvdimm_bus_list);
DEFINE_MUTEX(nvdimm_bus_list_mutex);
@@ -96,8 +97,33 @@ static ssize_t provider_show(struct device *dev,
}
static DEVICE_ATTR_RO(provider);
+static int flush_namespaces(struct device *dev, void *data)
+{
+ device_lock(dev);
+ device_unlock(dev);
+ return 0;
+}
+
+static int flush_regions_dimms(struct device *dev, void *data)
+{
+ device_lock(dev);
+ device_unlock(dev);
+ device_for_each_child(dev, NULL, flush_namespaces);
+ return 0;
+}
+
+static ssize_t wait_probe_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ nd_synchronize();
+ device_for_each_child(dev, NULL, flush_regions_dimms);
+ return sprintf(buf, "1\n");
+}
+static DEVICE_ATTR_RO(wait_probe);
+
static struct attribute *nvdimm_bus_attributes[] = {
&dev_attr_commands.attr,
+ &dev_attr_wait_probe.attr,
&dev_attr_provider.attr,
NULL,
};
@@ -158,7 +184,7 @@ static int child_unregister(struct device *dev, void *data)
if (dev->class)
/* pass */;
else
- device_unregister(dev);
+ nd_device_unregister(dev, ND_SYNC);
return 0;
}
@@ -171,6 +197,7 @@ void nvdimm_bus_unregister(struct nvdimm_bus *nvdimm_bus)
list_del_init(&nvdimm_bus->list);
mutex_unlock(&nvdimm_bus_list_mutex);
+ nd_synchronize();
device_for_each_child(&nvdimm_bus->dev, NULL, child_unregister);
nvdimm_bus_destroy_ndctl(nvdimm_bus);
@@ -180,12 +207,24 @@ EXPORT_SYMBOL_GPL(nvdimm_bus_unregister);
static __init int libnvdimm_init(void)
{
- return nvdimm_bus_init();
+ int rc;
+
+ rc = nvdimm_bus_init();
+ if (rc)
+ return rc;
+ rc = nvdimm_init();
+ if (rc)
+ goto err_dimm;
+ return 0;
+ err_dimm:
+ nvdimm_bus_exit();
+ return rc;
}
static __exit void libnvdimm_exit(void)
{
WARN_ON(!list_empty(&nvdimm_bus_list));
+ nvdimm_exit();
nvdimm_bus_exit();
}
diff --git a/drivers/nvdimm/dimm.c b/drivers/nvdimm/dimm.c
new file mode 100644
index 000000000000..28001a6ccd4e
--- /dev/null
+++ b/drivers/nvdimm/dimm.c
@@ -0,0 +1,92 @@
+/*
+ * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ */
+#include <linux/vmalloc.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/sizes.h>
+#include <linux/ndctl.h>
+#include <linux/slab.h>
+#include <linux/mm.h>
+#include <linux/nd.h>
+#include "nd.h"
+
+static void free_data(struct nvdimm_drvdata *ndd)
+{
+ if (!ndd)
+ return;
+
+ if (ndd->data && is_vmalloc_addr(ndd->data))
+ vfree(ndd->data);
+ else
+ kfree(ndd->data);
+ kfree(ndd);
+}
+
+static int nvdimm_probe(struct device *dev)
+{
+ struct nvdimm_drvdata *ndd;
+ int rc;
+
+ ndd = kzalloc(sizeof(*ndd), GFP_KERNEL);
+ if (!ndd)
+ return -ENOMEM;
+
+ dev_set_drvdata(dev, ndd);
+ ndd->dev = dev;
+
+ rc = nvdimm_init_nsarea(ndd);
+ if (rc)
+ goto err;
+
+ rc = nvdimm_init_config_data(ndd);
+ if (rc)
+ goto err;
+
+ dev_dbg(dev, "config data size: %d\n", ndd->nsarea.config_size);
+
+ return 0;
+
+ err:
+ free_data(ndd);
+ return rc;
+}
+
+static int nvdimm_remove(struct device *dev)
+{
+ struct nvdimm_drvdata *ndd = dev_get_drvdata(dev);
+
+ free_data(ndd);
+
+ return 0;
+}
+
+static struct nd_device_driver nvdimm_driver = {
+ .probe = nvdimm_probe,
+ .remove = nvdimm_remove,
+ .drv = {
+ .name = "nvdimm",
+ },
+ .type = ND_DRIVER_DIMM,
+};
+
+int __init nvdimm_init(void)
+{
+ return nd_driver_register(&nvdimm_driver);
+}
+
+void __exit nvdimm_exit(void)
+{
+ driver_unregister(&nvdimm_driver.drv);
+}
+
+MODULE_ALIAS_ND_DEVICE(ND_DEVICE_DIMM);
diff --git a/drivers/nvdimm/dimm_devs.c b/drivers/nvdimm/dimm_devs.c
index 100d682ead08..cb531a4c480d 100644
--- a/drivers/nvdimm/dimm_devs.c
+++ b/drivers/nvdimm/dimm_devs.c
@@ -11,6 +11,7 @@
* General Public License for more details.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/vmalloc.h>
#include <linux/device.h>
#include <linux/ndctl.h>
#include <linux/slab.h>
@@ -18,9 +19,115 @@
#include <linux/fs.h>
#include <linux/mm.h>
#include "nd-private.h"
+#include "nd.h"
static DEFINE_IDA(dimm_ida);
+/*
+ * Retrieve bus and dimm handle and return if this bus supports
+ * get_config_data commands
+ */
+static int __validate_dimm(struct nvdimm_drvdata *ndd)
+{
+ struct nvdimm *nvdimm;
+
+ if (!ndd)
+ return -EINVAL;
+
+ nvdimm = to_nvdimm(ndd->dev);
+
+ if (!nvdimm->dsm_mask)
+ return -ENXIO;
+ if (!test_bit(ND_CMD_GET_CONFIG_DATA, nvdimm->dsm_mask))
+ return -ENXIO;
+
+ return 0;
+}
+
+static int validate_dimm(struct nvdimm_drvdata *ndd)
+{
+ int rc = __validate_dimm(ndd);
+
+ if (rc && ndd)
+ dev_dbg(ndd->dev, "%pf: %s error: %d\n",
+ __builtin_return_address(0), __func__, rc);
+ return rc;
+}
+
+/**
+ * nvdimm_init_nsarea - determine the geometry of a dimm's namespace area
+ * @nvdimm: dimm to initialize
+ */
+int nvdimm_init_nsarea(struct nvdimm_drvdata *ndd)
+{
+ struct nd_cmd_get_config_size *cmd = &ndd->nsarea;
+ struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(ndd->dev);
+ struct nvdimm_bus_descriptor *nd_desc;
+ int rc = validate_dimm(ndd);
+
+ if (rc)
+ return rc;
+
+ if (cmd->config_size)
+ return 0; /* already valid */
+
+ memset(cmd, 0, sizeof(*cmd));
+ nd_desc = nvdimm_bus->nd_desc;
+ return nd_desc->ndctl(nd_desc, to_nvdimm(ndd->dev),
+ ND_CMD_GET_CONFIG_SIZE, cmd, sizeof(*cmd));
+}
+
+int nvdimm_init_config_data(struct nvdimm_drvdata *ndd)
+{
+ struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(ndd->dev);
+ struct nd_cmd_get_config_data_hdr *cmd;
+ struct nvdimm_bus_descriptor *nd_desc;
+ int rc = validate_dimm(ndd);
+ u32 max_cmd_size, config_size;
+ size_t offset;
+
+ if (rc)
+ return rc;
+
+ if (ndd->data)
+ return 0;
+
+ if (ndd->nsarea.status || ndd->nsarea.max_xfer == 0)
+ return -ENXIO;
+
+ ndd->data = kmalloc(ndd->nsarea.config_size, GFP_KERNEL);
+ if (!ndd->data)
+ ndd->data = vmalloc(ndd->nsarea.config_size);
+
+ if (!ndd->data)
+ return -ENOMEM;
+
+ max_cmd_size = min_t(u32, PAGE_SIZE, ndd->nsarea.max_xfer);
+ cmd = kzalloc(max_cmd_size + sizeof(*cmd), GFP_KERNEL);
+ if (!cmd)
+ return -ENOMEM;
+
+ nd_desc = nvdimm_bus->nd_desc;
+ for (config_size = ndd->nsarea.config_size, offset = 0;
+ config_size; config_size -= cmd->in_length,
+ offset += cmd->in_length) {
+ cmd->in_length = min(config_size, max_cmd_size);
+ cmd->in_offset = offset;
+ rc = nd_desc->ndctl(nd_desc, to_nvdimm(ndd->dev),
+ ND_CMD_GET_CONFIG_DATA, cmd,
+ cmd->in_length + sizeof(*cmd));
+ if (rc || cmd->status) {
+ rc = -ENXIO;
+ break;
+ }
+ memcpy(ndd->data + offset, cmd->out_buf, cmd->in_length);
+ }
+ dev_dbg(ndd->dev, "%s: len: %zd rc: %d\n", __func__, offset, rc);
+ kfree(cmd);
+
+ return rc;
+}
+
static void nvdimm_release(struct device *dev)
{
struct nvdimm *nvdimm = to_nvdimm(dev);
@@ -111,14 +218,33 @@ struct nvdimm *nvdimm_create(struct nvdimm_bus *nvdimm_bus, void *provider_data,
dev_set_name(dev, "nmem%d", nvdimm->id);
dev->parent = &nvdimm_bus->dev;
dev->type = &nvdimm_device_type;
- dev->bus = &nvdimm_bus_type;
dev->devt = MKDEV(nvdimm_major, nvdimm->id);
dev->groups = groups;
- if (device_register(dev) != 0) {
- put_device(dev);
- return NULL;
- }
+ nd_device_register(dev);
return nvdimm;
}
EXPORT_SYMBOL_GPL(nvdimm_create);
+
+static int count_dimms(struct device *dev, void *c)
+{
+ int *count = c;
+
+ if (is_nvdimm(dev))
+ (*count)++;
+ return 0;
+}
+
+int nvdimm_bus_validate_dimm_count(struct nvdimm_bus *nvdimm_bus, int dimm_count)
+{
+ int count = 0;
+ /* Flush any possible dimm registration failures */
+ nd_synchronize();
+
+ device_for_each_child(&nvdimm_bus->dev, &count, count_dimms);
+ dev_dbg(&nvdimm_bus->dev, "%s: count: %d\n", __func__, count);
+ if (count != dimm_count)
+ return -ENXIO;
+ return 0;
+}
+EXPORT_SYMBOL_GPL(nvdimm_bus_validate_dimm_count);
diff --git a/drivers/nvdimm/nd-private.h b/drivers/nvdimm/nd-private.h
index 95c4363884a5..4c0a27966000 100644
--- a/drivers/nvdimm/nd-private.h
+++ b/drivers/nvdimm/nd-private.h
@@ -17,7 +17,6 @@
extern struct list_head nvdimm_bus_list;
extern struct mutex nvdimm_bus_list_mutex;
-extern struct bus_type nvdimm_bus_type;
extern int nvdimm_major;
struct nvdimm_bus {
@@ -35,10 +34,11 @@ struct nvdimm {
int id;
};
-bool is_nvdimm(struct device *dev);
struct nvdimm_bus *walk_to_nvdimm_bus(struct device *nd_dev);
int __init nvdimm_bus_init(void);
-void __exit nvdimm_bus_exit(void);
+void nvdimm_bus_exit(void);
int nvdimm_bus_create_ndctl(struct nvdimm_bus *nvdimm_bus);
void nvdimm_bus_destroy_ndctl(struct nvdimm_bus *nvdimm_bus);
+void nd_synchronize(void);
+bool is_nvdimm(struct device *dev);
#endif /* __ND_PRIVATE_H__ */
diff --git a/drivers/nvdimm/nd.h b/drivers/nvdimm/nd.h
new file mode 100644
index 000000000000..1f7f6ecab0fc
--- /dev/null
+++ b/drivers/nvdimm/nd.h
@@ -0,0 +1,36 @@
+/*
+ * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ */
+#ifndef __ND_H__
+#define __ND_H__
+#include <linux/device.h>
+#include <linux/mutex.h>
+#include <linux/ndctl.h>
+
+struct nvdimm_drvdata {
+ struct device *dev;
+ struct nd_cmd_get_config_size nsarea;
+ void *data;
+};
+
+enum nd_async_mode {
+ ND_SYNC,
+ ND_ASYNC,
+};
+
+void nd_device_register(struct device *dev);
+void nd_device_unregister(struct device *dev, enum nd_async_mode mode);
+int __init nvdimm_init(void);
+void nvdimm_exit(void);
+int nvdimm_init_nsarea(struct nvdimm_drvdata *ndd);
+int nvdimm_init_config_data(struct nvdimm_drvdata *ndd);
+#endif /* __ND_H__ */
diff --git a/include/linux/libnvdimm.h b/include/linux/libnvdimm.h
index 2cfd6db58b54..73f15c6fceb9 100644
--- a/include/linux/libnvdimm.h
+++ b/include/linux/libnvdimm.h
@@ -30,6 +30,7 @@ enum {
extern struct attribute_group nvdimm_bus_attribute_group;
extern struct attribute_group nvdimm_attribute_group;
+extern struct attribute_group nd_device_attribute_group;
struct nvdimm;
struct nvdimm_bus_descriptor;
@@ -71,4 +72,5 @@ u32 nd_cmd_in_size(struct nvdimm *nvdimm, int cmd,
u32 nd_cmd_out_size(struct nvdimm *nvdimm, int cmd,
const struct nd_cmd_desc *desc, int idx, const u32 *in_field,
const u32 *out_field);
+int nvdimm_bus_validate_dimm_count(struct nvdimm_bus *nvdimm_bus, int dimm_count);
#endif /* __LIBNVDIMM_H__ */
diff --git a/include/linux/nd.h b/include/linux/nd.h
new file mode 100644
index 000000000000..e074f67e53a3
--- /dev/null
+++ b/include/linux/nd.h
@@ -0,0 +1,39 @@
+/*
+ * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ */
+#ifndef __LINUX_ND_H__
+#define __LINUX_ND_H__
+#include <linux/ndctl.h>
+#include <linux/device.h>
+
+struct nd_device_driver {
+ struct device_driver drv;
+ unsigned long type;
+ int (*probe)(struct device *dev);
+ int (*remove)(struct device *dev);
+};
+
+static inline struct nd_device_driver *to_nd_device_driver(
+ struct device_driver *drv)
+{
+ return container_of(drv, struct nd_device_driver, drv);
+}
+
+#define MODULE_ALIAS_ND_DEVICE(type) \
+ MODULE_ALIAS("nd:t" __stringify(type) "*")
+#define ND_DEVICE_MODALIAS_FMT "nd:t%d"
+
+int __must_check __nd_driver_register(struct nd_device_driver *nd_drv,
+ struct module *module, const char *mod_name);
+#define nd_driver_register(driver) \
+ __nd_driver_register(driver, THIS_MODULE, KBUILD_MODNAME)
+#endif /* __LINUX_ND_H__ */
diff --git a/include/uapi/linux/ndctl.h b/include/uapi/linux/ndctl.h
index 865dbfe8b99d..3e9341db4925 100644
--- a/include/uapi/linux/ndctl.h
+++ b/include/uapi/linux/ndctl.h
@@ -175,4 +175,10 @@ static inline const char *nvdimm_cmd_name(unsigned cmd)
#define ND_IOCTL_ARS_QUERY _IOWR(ND_IOCTL, ND_CMD_ARS_QUERY,\
struct nd_cmd_ars_query)
+
+#define ND_DEVICE_DIMM 1 /* nd_dimm: container for "config data" */
+
+enum nd_driver_flags {
+ ND_DRIVER_DIMM = 1 << ND_DEVICE_DIMM,
+};
#endif /* __NDCTL_H__ */
^ permalink raw reply related [flat|nested] 47+ messages in thread
* [PATCH v5 07/21] libnvdimm, nfit: regions (block-data-window, persistent memory, volatile memory)
2015-06-02 0:14 [PATCH v5 00/21] libnvdimm: non-volatile memory devices Dan Williams
` (5 preceding siblings ...)
2015-06-02 0:14 ` [PATCH v5 06/21] libnvdimm, nvdimm: dimm driver and base libnvdimm device-driver infrastructure Dan Williams
@ 2015-06-02 0:14 ` Dan Williams
2015-06-02 0:14 ` [PATCH v5 08/21] libnvdimm: support for legacy (non-aliasing) nvdimms Dan Williams
` (13 subsequent siblings)
20 siblings, 0 replies; 47+ messages in thread
From: Dan Williams @ 2015-06-02 0:14 UTC (permalink / raw)
To: linux-nvdimm
Cc: axboe, sfr, rafael, neilb, gregkh, linux-kernel, mingo,
linux-acpi, jmoyer, linux-api, akpm, hch
A "region" device represents the maximum capacity of a BLK range (mmio
block-data-window(s)), or a PMEM range (DAX-capable persistent memory or
volatile memory), without regard for aliasing. Aliasing, in the
dimm-local address space (DPA), is resolved by metadata on a dimm to
designate which exclusive interface will access the aliased DPA ranges.
Support for the per-dimm metadata/label arrvies is in a subsequent
patch.
The name format of "region" devices is "regionN" where, like dimms, N is
a global ida index assigned at discovery time. This id is not reliable
across reboots nor in the presence of hotplug. Look to attributes of
the region or static id-data of the sub-namespace to generate a
persistent name. However, if the platform configuration does not change
it is reasonable to expect the same region id to be assigned at the next
boot.
"region"s have 2 generic attributes "size", and "mapping"s where:
- size: the BLK accessible capacity or the span of the
system physical address range in the case of PMEM.
- mappingN: a tuple describing a dimm's contribution to the region's
capacity in the format (<nmemX>,<dpa>,<size>). For a
PMEM-region there will be at least one mapping per dimm in the interleave
set. For a BLK-region there is only "mapping0" listing the starting
DPA of the BLK-region and the available DPA capacity of that space
(matches "size" above).
The max number of mappings per "region" is hard coded per the constraints of
sysfs attribute groups. That said the number of mappings per region should
never exceed the maximum number of possible dimms in the system. If the
current number turns out to not be enough then the "mappings" attribute
clarifies how many there are supposed to be. "32 should be enough for
anybody...".
Cc: Neil Brown <neilb@suse.de>
Cc: <linux-acpi@vger.kernel.org>
Cc: Greg KH <gregkh@linuxfoundation.org>
Cc: Robert Moore <robert.moore@intel.com>
Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
drivers/acpi/nfit.c | 130 ++++++++++++++++++-
drivers/nvdimm/Makefile | 1
drivers/nvdimm/nd-private.h | 3
drivers/nvdimm/nd.h | 11 ++
drivers/nvdimm/region_devs.c | 294 ++++++++++++++++++++++++++++++++++++++++++
include/linux/libnvdimm.h | 25 ++++
6 files changed, 463 insertions(+), 1 deletion(-)
create mode 100644 drivers/nvdimm/region_devs.c
diff --git a/drivers/acpi/nfit.c b/drivers/acpi/nfit.c
index 1bec597107d2..6c79c4ec9216 100644
--- a/drivers/acpi/nfit.c
+++ b/drivers/acpi/nfit.c
@@ -715,11 +715,135 @@ static void acpi_nfit_init_dsms(struct acpi_nfit_desc *acpi_desc)
set_bit(i, &nd_desc->dsm_mask);
}
+static ssize_t range_index_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct nd_region *nd_region = to_nd_region(dev);
+ struct nfit_spa *nfit_spa = nd_region_provider_data(nd_region);
+
+ return sprintf(buf, "%d\n", nfit_spa->spa->range_index);
+}
+static DEVICE_ATTR_RO(range_index);
+
+static struct attribute *acpi_nfit_region_attributes[] = {
+ &dev_attr_range_index.attr,
+ NULL,
+};
+
+static struct attribute_group acpi_nfit_region_attribute_group = {
+ .name = "nfit",
+ .attrs = acpi_nfit_region_attributes,
+};
+
+static const struct attribute_group *acpi_nfit_region_attribute_groups[] = {
+ &nd_region_attribute_group,
+ &nd_mapping_attribute_group,
+ &acpi_nfit_region_attribute_group,
+ NULL,
+};
+
+static int acpi_nfit_register_region(struct acpi_nfit_desc *acpi_desc,
+ struct nfit_spa *nfit_spa)
+{
+ static struct nd_mapping nd_mappings[ND_MAX_MAPPINGS];
+ struct acpi_nfit_system_address *spa = nfit_spa->spa;
+ struct nfit_memdev *nfit_memdev;
+ struct nd_region_desc ndr_desc;
+ int spa_type, count = 0;
+ struct resource res;
+ u16 range_index;
+
+ spa_type = nfit_spa_type(spa);
+ range_index = spa->range_index;
+ if (range_index == 0) {
+ dev_dbg(acpi_desc->dev, "%s: detected invalid spa index\n",
+ __func__);
+ return 0;
+ }
+
+ memset(&res, 0, sizeof(res));
+ memset(&nd_mappings, 0, sizeof(nd_mappings));
+ memset(&ndr_desc, 0, sizeof(ndr_desc));
+ res.start = spa->address;
+ res.end = res.start + spa->length - 1;
+ ndr_desc.res = &res;
+ ndr_desc.provider_data = nfit_spa;
+ ndr_desc.attr_groups = acpi_nfit_region_attribute_groups;
+ list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) {
+ struct acpi_nfit_memory_map *memdev = nfit_memdev->memdev;
+ struct nd_mapping *nd_mapping;
+ struct nvdimm *nvdimm;
+
+ if (memdev->range_index != range_index)
+ continue;
+ if (count >= ND_MAX_MAPPINGS) {
+ dev_err(acpi_desc->dev, "spa%d exceeds max mappings %d\n",
+ range_index, ND_MAX_MAPPINGS);
+ return -ENXIO;
+ }
+ nvdimm = acpi_nfit_dimm_by_handle(acpi_desc, memdev->device_handle);
+ if (!nvdimm) {
+ dev_err(acpi_desc->dev, "spa%d dimm: %#x not found\n",
+ range_index, memdev->device_handle);
+ return -ENODEV;
+ }
+ nd_mapping = &nd_mappings[count++];
+ nd_mapping->nvdimm = nvdimm;
+ if (spa_type == NFIT_SPA_PM || spa_type == NFIT_SPA_VOLATILE) {
+ nd_mapping->start = memdev->address;
+ nd_mapping->size = memdev->region_size;
+ } else if (spa_type == NFIT_SPA_DCR) {
+ struct nfit_mem *nfit_mem;
+ int blk_valid = 1;
+
+ nfit_mem = nvdimm_provider_data(nvdimm);
+ if (!nfit_mem || !nfit_mem->bdw) {
+ dev_dbg(acpi_desc->dev, "%s: spa%d missing bdw\n",
+ nvdimm_name(nvdimm), range_index);
+ blk_valid = 0;
+ } else {
+ nd_mapping->size = nfit_mem->bdw->capacity;
+ nd_mapping->start = nfit_mem->bdw->start_address;
+ }
+
+ ndr_desc.nd_mapping = nd_mapping;
+ ndr_desc.num_mappings = blk_valid;
+ if (!nvdimm_blk_region_create(acpi_desc->nvdimm_bus, &ndr_desc))
+ return -ENOMEM;
+ }
+ }
+
+ ndr_desc.nd_mapping = nd_mappings;
+ ndr_desc.num_mappings = count;
+ if (spa_type == NFIT_SPA_PM) {
+ if (!nvdimm_pmem_region_create(acpi_desc->nvdimm_bus, &ndr_desc))
+ return -ENOMEM;
+ } else if (spa_type == NFIT_SPA_VOLATILE) {
+ if (!nvdimm_volatile_region_create(acpi_desc->nvdimm_bus, &ndr_desc))
+ return -ENOMEM;
+ }
+ return 0;
+}
+
+static int acpi_nfit_register_regions(struct acpi_nfit_desc *acpi_desc)
+{
+ struct nfit_spa *nfit_spa;
+
+ list_for_each_entry(nfit_spa, &acpi_desc->spas, list) {
+ int rc = acpi_nfit_register_region(acpi_desc, nfit_spa);
+
+ if (rc)
+ return rc;
+ }
+ return 0;
+}
+
static int acpi_nfit_init(struct acpi_nfit_desc *acpi_desc, acpi_size sz)
{
struct device *dev = acpi_desc->dev;
const void *end;
u8 *data;
+ int rc;
INIT_LIST_HEAD(&acpi_desc->spas);
INIT_LIST_HEAD(&acpi_desc->dcrs);
@@ -744,7 +868,11 @@ static int acpi_nfit_init(struct acpi_nfit_desc *acpi_desc, acpi_size sz)
acpi_nfit_init_dsms(acpi_desc);
- return acpi_nfit_register_dimms(acpi_desc);
+ rc = acpi_nfit_register_dimms(acpi_desc);
+ if (rc)
+ return rc;
+
+ return acpi_nfit_register_regions(acpi_desc);
}
static int acpi_nfit_add(struct acpi_device *adev)
diff --git a/drivers/nvdimm/Makefile b/drivers/nvdimm/Makefile
index d44b5c1fcd3b..88afd0d849c3 100644
--- a/drivers/nvdimm/Makefile
+++ b/drivers/nvdimm/Makefile
@@ -4,3 +4,4 @@ libnvdimm-y := core.o
libnvdimm-y += bus.o
libnvdimm-y += dimm_devs.o
libnvdimm-y += dimm.o
+libnvdimm-y += region_devs.o
diff --git a/drivers/nvdimm/nd-private.h b/drivers/nvdimm/nd-private.h
index 4c0a27966000..9ac24c975251 100644
--- a/drivers/nvdimm/nd-private.h
+++ b/drivers/nvdimm/nd-private.h
@@ -40,5 +40,8 @@ void nvdimm_bus_exit(void);
int nvdimm_bus_create_ndctl(struct nvdimm_bus *nvdimm_bus);
void nvdimm_bus_destroy_ndctl(struct nvdimm_bus *nvdimm_bus);
void nd_synchronize(void);
+int nvdimm_bus_register_dimms(struct nvdimm_bus *nvdimm_bus);
+int nvdimm_bus_register_regions(struct nvdimm_bus *nvdimm_bus);
+int nd_match_dimm(struct device *dev, void *data);
bool is_nvdimm(struct device *dev);
#endif /* __ND_PRIVATE_H__ */
diff --git a/drivers/nvdimm/nd.h b/drivers/nvdimm/nd.h
index 1f7f6ecab0fc..ea0cca337aa6 100644
--- a/drivers/nvdimm/nd.h
+++ b/drivers/nvdimm/nd.h
@@ -12,6 +12,7 @@
*/
#ifndef __ND_H__
#define __ND_H__
+#include <linux/libnvdimm.h>
#include <linux/device.h>
#include <linux/mutex.h>
#include <linux/ndctl.h>
@@ -22,6 +23,16 @@ struct nvdimm_drvdata {
void *data;
};
+struct nd_region {
+ struct device dev;
+ u16 ndr_mappings;
+ u64 ndr_size;
+ u64 ndr_start;
+ int id;
+ void *provider_data;
+ struct nd_mapping mapping[0];
+};
+
enum nd_async_mode {
ND_SYNC,
ND_ASYNC,
diff --git a/drivers/nvdimm/region_devs.c b/drivers/nvdimm/region_devs.c
new file mode 100644
index 000000000000..c6fdf3cea2d1
--- /dev/null
+++ b/drivers/nvdimm/region_devs.c
@@ -0,0 +1,294 @@
+/*
+ * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ */
+#include <linux/slab.h>
+#include <linux/io.h>
+#include "nd-private.h"
+#include "nd.h"
+
+static DEFINE_IDA(region_ida);
+
+static void nd_region_release(struct device *dev)
+{
+ struct nd_region *nd_region = to_nd_region(dev);
+ u16 i;
+
+ for (i = 0; i < nd_region->ndr_mappings; i++) {
+ struct nd_mapping *nd_mapping = &nd_region->mapping[i];
+ struct nvdimm *nvdimm = nd_mapping->nvdimm;
+
+ put_device(&nvdimm->dev);
+ }
+ ida_simple_remove(®ion_ida, nd_region->id);
+ kfree(nd_region);
+}
+
+static struct device_type nd_blk_device_type = {
+ .name = "nd_blk",
+ .release = nd_region_release,
+};
+
+static struct device_type nd_pmem_device_type = {
+ .name = "nd_pmem",
+ .release = nd_region_release,
+};
+
+static struct device_type nd_volatile_device_type = {
+ .name = "nd_volatile",
+ .release = nd_region_release,
+};
+
+static bool is_nd_pmem(struct device *dev)
+{
+ return dev ? dev->type == &nd_pmem_device_type : false;
+}
+
+struct nd_region *to_nd_region(struct device *dev)
+{
+ struct nd_region *nd_region = container_of(dev, struct nd_region, dev);
+
+ WARN_ON(dev->type->release != nd_region_release);
+ return nd_region;
+}
+EXPORT_SYMBOL_GPL(to_nd_region);
+
+static ssize_t size_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct nd_region *nd_region = to_nd_region(dev);
+ unsigned long long size = 0;
+
+ if (is_nd_pmem(dev)) {
+ size = nd_region->ndr_size;
+ } else if (nd_region->ndr_mappings == 1) {
+ struct nd_mapping *nd_mapping = &nd_region->mapping[0];
+
+ size = nd_mapping->size;
+ }
+
+ return sprintf(buf, "%llu\n", size);
+}
+static DEVICE_ATTR_RO(size);
+
+static ssize_t mappings_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct nd_region *nd_region = to_nd_region(dev);
+
+ return sprintf(buf, "%d\n", nd_region->ndr_mappings);
+}
+static DEVICE_ATTR_RO(mappings);
+
+static struct attribute *nd_region_attributes[] = {
+ &dev_attr_size.attr,
+ &dev_attr_mappings.attr,
+ NULL,
+};
+
+struct attribute_group nd_region_attribute_group = {
+ .attrs = nd_region_attributes,
+};
+EXPORT_SYMBOL_GPL(nd_region_attribute_group);
+
+static ssize_t mappingN(struct device *dev, char *buf, int n)
+{
+ struct nd_region *nd_region = to_nd_region(dev);
+ struct nd_mapping *nd_mapping;
+ struct nvdimm *nvdimm;
+
+ if (n >= nd_region->ndr_mappings)
+ return -ENXIO;
+ nd_mapping = &nd_region->mapping[n];
+ nvdimm = nd_mapping->nvdimm;
+
+ return sprintf(buf, "%s,%llu,%llu\n", dev_name(&nvdimm->dev),
+ nd_mapping->start, nd_mapping->size);
+}
+
+#define REGION_MAPPING(idx) \
+static ssize_t mapping##idx##_show(struct device *dev, \
+ struct device_attribute *attr, char *buf) \
+{ \
+ return mappingN(dev, buf, idx); \
+} \
+static DEVICE_ATTR_RO(mapping##idx)
+
+/*
+ * 32 should be enough for a while, even in the presence of socket
+ * interleave a 32-way interleave set is a degenerate case.
+ */
+REGION_MAPPING(0);
+REGION_MAPPING(1);
+REGION_MAPPING(2);
+REGION_MAPPING(3);
+REGION_MAPPING(4);
+REGION_MAPPING(5);
+REGION_MAPPING(6);
+REGION_MAPPING(7);
+REGION_MAPPING(8);
+REGION_MAPPING(9);
+REGION_MAPPING(10);
+REGION_MAPPING(11);
+REGION_MAPPING(12);
+REGION_MAPPING(13);
+REGION_MAPPING(14);
+REGION_MAPPING(15);
+REGION_MAPPING(16);
+REGION_MAPPING(17);
+REGION_MAPPING(18);
+REGION_MAPPING(19);
+REGION_MAPPING(20);
+REGION_MAPPING(21);
+REGION_MAPPING(22);
+REGION_MAPPING(23);
+REGION_MAPPING(24);
+REGION_MAPPING(25);
+REGION_MAPPING(26);
+REGION_MAPPING(27);
+REGION_MAPPING(28);
+REGION_MAPPING(29);
+REGION_MAPPING(30);
+REGION_MAPPING(31);
+
+static umode_t nd_mapping_visible(struct kobject *kobj, struct attribute *a, int n)
+{
+ struct device *dev = container_of(kobj, struct device, kobj);
+ struct nd_region *nd_region = to_nd_region(dev);
+
+ if (n < nd_region->ndr_mappings)
+ return a->mode;
+ return 0;
+}
+
+static struct attribute *nd_mapping_attributes[] = {
+ &dev_attr_mapping0.attr,
+ &dev_attr_mapping1.attr,
+ &dev_attr_mapping2.attr,
+ &dev_attr_mapping3.attr,
+ &dev_attr_mapping4.attr,
+ &dev_attr_mapping5.attr,
+ &dev_attr_mapping6.attr,
+ &dev_attr_mapping7.attr,
+ &dev_attr_mapping8.attr,
+ &dev_attr_mapping9.attr,
+ &dev_attr_mapping10.attr,
+ &dev_attr_mapping11.attr,
+ &dev_attr_mapping12.attr,
+ &dev_attr_mapping13.attr,
+ &dev_attr_mapping14.attr,
+ &dev_attr_mapping15.attr,
+ &dev_attr_mapping16.attr,
+ &dev_attr_mapping17.attr,
+ &dev_attr_mapping18.attr,
+ &dev_attr_mapping19.attr,
+ &dev_attr_mapping20.attr,
+ &dev_attr_mapping21.attr,
+ &dev_attr_mapping22.attr,
+ &dev_attr_mapping23.attr,
+ &dev_attr_mapping24.attr,
+ &dev_attr_mapping25.attr,
+ &dev_attr_mapping26.attr,
+ &dev_attr_mapping27.attr,
+ &dev_attr_mapping28.attr,
+ &dev_attr_mapping29.attr,
+ &dev_attr_mapping30.attr,
+ &dev_attr_mapping31.attr,
+ NULL,
+};
+
+struct attribute_group nd_mapping_attribute_group = {
+ .is_visible = nd_mapping_visible,
+ .attrs = nd_mapping_attributes,
+};
+EXPORT_SYMBOL_GPL(nd_mapping_attribute_group);
+
+void *nd_region_provider_data(struct nd_region *nd_region)
+{
+ return nd_region->provider_data;
+}
+EXPORT_SYMBOL_GPL(nd_region_provider_data);
+
+static noinline struct nd_region *nd_region_create(struct nvdimm_bus *nvdimm_bus,
+ struct nd_region_desc *ndr_desc, struct device_type *dev_type)
+{
+ struct nd_region *nd_region;
+ struct device *dev;
+ u16 i;
+
+ for (i = 0; i < ndr_desc->num_mappings; i++) {
+ struct nd_mapping *nd_mapping = &ndr_desc->nd_mapping[i];
+ struct nvdimm *nvdimm = nd_mapping->nvdimm;
+
+ if ((nd_mapping->start | nd_mapping->size) % SZ_4K) {
+ dev_err(&nvdimm_bus->dev, "%pf: %s mapping%d is not 4K aligned\n",
+ __builtin_return_address(0),
+ dev_name(&nvdimm->dev), i);
+
+ return NULL;
+ }
+ }
+
+ nd_region = kzalloc(sizeof(struct nd_region)
+ + sizeof(struct nd_mapping) * ndr_desc->num_mappings,
+ GFP_KERNEL);
+ if (!nd_region)
+ return NULL;
+ nd_region->id = ida_simple_get(®ion_ida, 0, 0, GFP_KERNEL);
+ if (nd_region->id < 0) {
+ kfree(nd_region);
+ return NULL;
+ }
+
+ memcpy(nd_region->mapping, ndr_desc->nd_mapping,
+ sizeof(struct nd_mapping) * ndr_desc->num_mappings);
+ for (i = 0; i < ndr_desc->num_mappings; i++) {
+ struct nd_mapping *nd_mapping = &ndr_desc->nd_mapping[i];
+ struct nvdimm *nvdimm = nd_mapping->nvdimm;
+
+ get_device(&nvdimm->dev);
+ }
+ nd_region->ndr_mappings = ndr_desc->num_mappings;
+ nd_region->provider_data = ndr_desc->provider_data;
+ dev = &nd_region->dev;
+ dev_set_name(dev, "region%d", nd_region->id);
+ dev->parent = &nvdimm_bus->dev;
+ dev->type = dev_type;
+ dev->groups = ndr_desc->attr_groups;
+ nd_region->ndr_size = resource_size(ndr_desc->res);
+ nd_region->ndr_start = ndr_desc->res->start;
+ nd_device_register(dev);
+
+ return nd_region;
+}
+
+struct nd_region *nvdimm_pmem_region_create(struct nvdimm_bus *nvdimm_bus,
+ struct nd_region_desc *ndr_desc)
+{
+ return nd_region_create(nvdimm_bus, ndr_desc, &nd_pmem_device_type);
+}
+EXPORT_SYMBOL_GPL(nvdimm_pmem_region_create);
+
+struct nd_region *nvdimm_blk_region_create(struct nvdimm_bus *nvdimm_bus,
+ struct nd_region_desc *ndr_desc)
+{
+ if (ndr_desc->num_mappings > 1)
+ return NULL;
+ return nd_region_create(nvdimm_bus, ndr_desc, &nd_blk_device_type);
+}
+EXPORT_SYMBOL_GPL(nvdimm_blk_region_create);
+
+struct nd_region *nvdimm_volatile_region_create(struct nvdimm_bus *nvdimm_bus,
+ struct nd_region_desc *ndr_desc)
+{
+ return nd_region_create(nvdimm_bus, ndr_desc, &nd_volatile_device_type);
+}
+EXPORT_SYMBOL_GPL(nvdimm_volatile_region_create);
diff --git a/include/linux/libnvdimm.h b/include/linux/libnvdimm.h
index 73f15c6fceb9..4de60198a778 100644
--- a/include/linux/libnvdimm.h
+++ b/include/linux/libnvdimm.h
@@ -26,11 +26,14 @@ enum {
ND_CMD_MAX_ELEM = 4,
ND_CMD_MAX_ENVELOPE = 16,
ND_CMD_ARS_QUERY_MAX = SZ_4K,
+ ND_MAX_MAPPINGS = 32,
};
extern struct attribute_group nvdimm_bus_attribute_group;
extern struct attribute_group nvdimm_attribute_group;
extern struct attribute_group nd_device_attribute_group;
+extern struct attribute_group nd_region_attribute_group;
+extern struct attribute_group nd_mapping_attribute_group;
struct nvdimm;
struct nvdimm_bus_descriptor;
@@ -38,6 +41,12 @@ typedef int (*ndctl_fn)(struct nvdimm_bus_descriptor *nd_desc,
struct nvdimm *nvdimm, unsigned int cmd, void *buf,
unsigned int buf_len);
+struct nd_mapping {
+ struct nvdimm *nvdimm;
+ u64 start;
+ u64 size;
+};
+
struct nvdimm_bus_descriptor {
const struct attribute_group **attr_groups;
unsigned long dsm_mask;
@@ -52,6 +61,14 @@ struct nd_cmd_desc {
int out_sizes[ND_CMD_MAX_ELEM];
};
+struct nd_region_desc {
+ struct resource *res;
+ struct nd_mapping *nd_mapping;
+ u16 num_mappings;
+ const struct attribute_group **attr_groups;
+ void *provider_data;
+};
+
struct nvdimm_bus;
struct device;
struct nvdimm_bus *nvdimm_bus_register(struct device *parent,
@@ -59,9 +76,11 @@ struct nvdimm_bus *nvdimm_bus_register(struct device *parent,
void nvdimm_bus_unregister(struct nvdimm_bus *nvdimm_bus);
struct nvdimm_bus *to_nvdimm_bus(struct device *dev);
struct nvdimm *to_nvdimm(struct device *dev);
+struct nd_region *to_nd_region(struct device *dev);
struct nvdimm_bus_descriptor *to_nd_desc(struct nvdimm_bus *nvdimm_bus);
const char *nvdimm_name(struct nvdimm *nvdimm);
void *nvdimm_provider_data(struct nvdimm *nvdimm);
+void *nd_region_provider_data(struct nd_region *nd_region);
struct nvdimm *nvdimm_create(struct nvdimm_bus *nvdimm_bus, void *provider_data,
const struct attribute_group **groups, unsigned long flags,
unsigned long *dsm_mask);
@@ -73,4 +92,10 @@ u32 nd_cmd_out_size(struct nvdimm *nvdimm, int cmd,
const struct nd_cmd_desc *desc, int idx, const u32 *in_field,
const u32 *out_field);
int nvdimm_bus_validate_dimm_count(struct nvdimm_bus *nvdimm_bus, int dimm_count);
+struct nd_region *nvdimm_pmem_region_create(struct nvdimm_bus *nvdimm_bus,
+ struct nd_region_desc *ndr_desc);
+struct nd_region *nvdimm_blk_region_create(struct nvdimm_bus *nvdimm_bus,
+ struct nd_region_desc *ndr_desc);
+struct nd_region *nvdimm_volatile_region_create(struct nvdimm_bus *nvdimm_bus,
+ struct nd_region_desc *ndr_desc);
#endif /* __LIBNVDIMM_H__ */
^ permalink raw reply related [flat|nested] 47+ messages in thread
* [PATCH v5 08/21] libnvdimm: support for legacy (non-aliasing) nvdimms
2015-06-02 0:14 [PATCH v5 00/21] libnvdimm: non-volatile memory devices Dan Williams
` (6 preceding siblings ...)
2015-06-02 0:14 ` [PATCH v5 07/21] libnvdimm, nfit: regions (block-data-window, persistent memory, volatile memory) Dan Williams
@ 2015-06-02 0:14 ` Dan Williams
2015-06-02 0:14 ` [PATCH v5 09/21] libnvdimm, nd_pmem: add libnvdimm support to the pmem driver Dan Williams
` (12 subsequent siblings)
20 siblings, 0 replies; 47+ messages in thread
From: Dan Williams @ 2015-06-02 0:14 UTC (permalink / raw)
To: linux-nvdimm
Cc: axboe, sfr, rafael, neilb, gregkh, linux-kernel, mingo,
linux-acpi, jmoyer, linux-api, akpm, hch
The libnvdimm region driver is an intermediary driver that translates
non-volatile "region"s into "namespace" sub-devices that are surfaced by
persistent memory block-device drivers (PMEM and BLK).
ACPI 6 introduces the concept that a given nvdimm may simultaneously
offer multiple access modes to its media through direct PMEM load/store
access, or windowed BLK mode. Existing nvdimms mostly implement a PMEM
interface, some offer a BLK-like mode, but never both as ACPI 6 defines.
If an nvdimm is single interfaced, then there is no need for dimm
metadata labels. For these devices we can take the region boundaries
directly to create a child namespace device (nd_namespace_io).
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
drivers/acpi/nfit.c | 1
drivers/nvdimm/Makefile | 2 +
drivers/nvdimm/bus.c | 26 +++++++++
drivers/nvdimm/core.c | 44 ++++++++++++++-
drivers/nvdimm/dimm.c | 2 -
drivers/nvdimm/namespace_devs.c | 111 +++++++++++++++++++++++++++++++++++++++
drivers/nvdimm/nd-private.h | 6 ++
drivers/nvdimm/nd.h | 13 +++++
drivers/nvdimm/region.c | 93 +++++++++++++++++++++++++++++++++
drivers/nvdimm/region_devs.c | 66 +++++++++++++++++++++++
include/linux/libnvdimm.h | 7 ++
include/linux/nd.h | 10 ++++
include/uapi/linux/ndctl.h | 10 ++++
13 files changed, 383 insertions(+), 8 deletions(-)
create mode 100644 drivers/nvdimm/namespace_devs.c
create mode 100644 drivers/nvdimm/region.c
diff --git a/drivers/acpi/nfit.c b/drivers/acpi/nfit.c
index 6c79c4ec9216..b8e0a762692f 100644
--- a/drivers/acpi/nfit.c
+++ b/drivers/acpi/nfit.c
@@ -738,6 +738,7 @@ static struct attribute_group acpi_nfit_region_attribute_group = {
static const struct attribute_group *acpi_nfit_region_attribute_groups[] = {
&nd_region_attribute_group,
&nd_mapping_attribute_group,
+ &nd_device_attribute_group,
&acpi_nfit_region_attribute_group,
NULL,
};
diff --git a/drivers/nvdimm/Makefile b/drivers/nvdimm/Makefile
index 88afd0d849c3..af5e2760ddbd 100644
--- a/drivers/nvdimm/Makefile
+++ b/drivers/nvdimm/Makefile
@@ -5,3 +5,5 @@ libnvdimm-y += bus.o
libnvdimm-y += dimm_devs.o
libnvdimm-y += dimm.o
libnvdimm-y += region_devs.o
+libnvdimm-y += region.o
+libnvdimm-y += namespace_devs.o
diff --git a/drivers/nvdimm/bus.c b/drivers/nvdimm/bus.c
index 03861550c586..eeffe9498275 100644
--- a/drivers/nvdimm/bus.c
+++ b/drivers/nvdimm/bus.c
@@ -13,6 +13,7 @@
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/vmalloc.h>
#include <linux/uaccess.h>
+#include <linux/module.h>
#include <linux/fcntl.h>
#include <linux/async.h>
#include <linux/ndctl.h>
@@ -33,6 +34,12 @@ static int to_nd_device_type(struct device *dev)
{
if (is_nvdimm(dev))
return ND_DEVICE_DIMM;
+ else if (is_nd_pmem(dev))
+ return ND_DEVICE_REGION_PMEM;
+ else if (is_nd_blk(dev))
+ return ND_DEVICE_REGION_BLK;
+ else if (is_nd_pmem(dev->parent) || is_nd_blk(dev->parent))
+ return nd_region_to_namespace_type(to_nd_region(dev->parent));
return 0;
}
@@ -50,27 +57,46 @@ static int nvdimm_bus_match(struct device *dev, struct device_driver *drv)
return test_bit(to_nd_device_type(dev), &nd_drv->type);
}
+static struct module *to_bus_provider(struct device *dev)
+{
+ /* pin bus providers while regions are enabled */
+ if (is_nd_pmem(dev) || is_nd_blk(dev)) {
+ struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
+
+ return nvdimm_bus->module;
+ }
+ return NULL;
+}
+
static int nvdimm_bus_probe(struct device *dev)
{
struct nd_device_driver *nd_drv = to_nd_device_driver(dev->driver);
+ struct module *provider = to_bus_provider(dev);
struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
int rc;
+ if (!try_module_get(provider))
+ return -ENXIO;
+
rc = nd_drv->probe(dev);
dev_dbg(&nvdimm_bus->dev, "%s.probe(%s) = %d\n", dev->driver->name,
dev_name(dev), rc);
+ if (rc != 0)
+ module_put(provider);
return rc;
}
static int nvdimm_bus_remove(struct device *dev)
{
struct nd_device_driver *nd_drv = to_nd_device_driver(dev->driver);
+ struct module *provider = to_bus_provider(dev);
struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
int rc;
rc = nd_drv->remove(dev);
dev_dbg(&nvdimm_bus->dev, "%s.remove(%s) = %d\n", dev->driver->name,
dev_name(dev), rc);
+ module_put(provider);
return rc;
}
diff --git a/drivers/nvdimm/core.c b/drivers/nvdimm/core.c
index 3e11cea4b0b8..df1a36565fb3 100644
--- a/drivers/nvdimm/core.c
+++ b/drivers/nvdimm/core.c
@@ -24,6 +24,36 @@ LIST_HEAD(nvdimm_bus_list);
DEFINE_MUTEX(nvdimm_bus_list_mutex);
static DEFINE_IDA(nd_ida);
+void nvdimm_bus_lock(struct device *dev)
+{
+ struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
+
+ if (!nvdimm_bus)
+ return;
+ mutex_lock(&nvdimm_bus->reconfig_mutex);
+}
+EXPORT_SYMBOL(nvdimm_bus_lock);
+
+void nvdimm_bus_unlock(struct device *dev)
+{
+ struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
+
+ if (!nvdimm_bus)
+ return;
+ mutex_unlock(&nvdimm_bus->reconfig_mutex);
+}
+EXPORT_SYMBOL(nvdimm_bus_unlock);
+
+bool is_nvdimm_bus_locked(struct device *dev)
+{
+ struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
+
+ if (!nvdimm_bus)
+ return false;
+ return mutex_is_locked(&nvdimm_bus->reconfig_mutex);
+}
+EXPORT_SYMBOL(is_nvdimm_bus_locked);
+
static void nvdimm_bus_release(struct device *dev)
{
struct nvdimm_bus *nvdimm_bus = container_of(dev, struct nvdimm_bus, dev);
@@ -133,8 +163,8 @@ struct attribute_group nvdimm_bus_attribute_group = {
};
EXPORT_SYMBOL_GPL(nvdimm_bus_attribute_group);
-struct nvdimm_bus *nvdimm_bus_register(struct device *parent,
- struct nvdimm_bus_descriptor *nd_desc)
+struct nvdimm_bus *__nvdimm_bus_register(struct device *parent,
+ struct nvdimm_bus_descriptor *nd_desc, struct module *module)
{
struct nvdimm_bus *nvdimm_bus = kzalloc(sizeof(*nvdimm_bus), GFP_KERNEL);
int rc;
@@ -143,11 +173,13 @@ struct nvdimm_bus *nvdimm_bus_register(struct device *parent,
return NULL;
INIT_LIST_HEAD(&nvdimm_bus->list);
nvdimm_bus->id = ida_simple_get(&nd_ida, 0, 0, GFP_KERNEL);
+ mutex_init(&nvdimm_bus->reconfig_mutex);
if (nvdimm_bus->id < 0) {
kfree(nvdimm_bus);
return NULL;
}
nvdimm_bus->nd_desc = nd_desc;
+ nvdimm_bus->module = module;
nvdimm_bus->dev.parent = parent;
nvdimm_bus->dev.release = nvdimm_bus_release;
nvdimm_bus->dev.groups = nd_desc->attr_groups;
@@ -171,7 +203,7 @@ struct nvdimm_bus *nvdimm_bus_register(struct device *parent,
put_device(&nvdimm_bus->dev);
return NULL;
}
-EXPORT_SYMBOL_GPL(nvdimm_bus_register);
+EXPORT_SYMBOL_GPL(__nvdimm_bus_register);
static int child_unregister(struct device *dev, void *data)
{
@@ -215,7 +247,12 @@ static __init int libnvdimm_init(void)
rc = nvdimm_init();
if (rc)
goto err_dimm;
+ rc = nd_region_init();
+ if (rc)
+ goto err_region;
return 0;
+ err_region:
+ nvdimm_exit();
err_dimm:
nvdimm_bus_exit();
return rc;
@@ -224,6 +261,7 @@ static __init int libnvdimm_init(void)
static __exit void libnvdimm_exit(void)
{
WARN_ON(!list_empty(&nvdimm_bus_list));
+ nd_region_exit();
nvdimm_exit();
nvdimm_bus_exit();
}
diff --git a/drivers/nvdimm/dimm.c b/drivers/nvdimm/dimm.c
index 28001a6ccd4e..eb20fc2df32b 100644
--- a/drivers/nvdimm/dimm.c
+++ b/drivers/nvdimm/dimm.c
@@ -84,7 +84,7 @@ int __init nvdimm_init(void)
return nd_driver_register(&nvdimm_driver);
}
-void __exit nvdimm_exit(void)
+void nvdimm_exit(void)
{
driver_unregister(&nvdimm_driver.drv);
}
diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c
new file mode 100644
index 000000000000..8fbdf68c64d8
--- /dev/null
+++ b/drivers/nvdimm/namespace_devs.c
@@ -0,0 +1,111 @@
+/*
+ * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ */
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/slab.h>
+#include <linux/nd.h>
+#include "nd.h"
+
+static void namespace_io_release(struct device *dev)
+{
+ struct nd_namespace_io *nsio = to_nd_namespace_io(dev);
+
+ kfree(nsio);
+}
+
+static struct device_type namespace_io_device_type = {
+ .name = "nd_namespace_io",
+ .release = namespace_io_release,
+};
+
+static ssize_t nstype_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct nd_region *nd_region = to_nd_region(dev->parent);
+
+ return sprintf(buf, "%d\n", nd_region_to_namespace_type(nd_region));
+}
+static DEVICE_ATTR_RO(nstype);
+
+static struct attribute *nd_namespace_attributes[] = {
+ &dev_attr_nstype.attr,
+ NULL,
+};
+
+static struct attribute_group nd_namespace_attribute_group = {
+ .attrs = nd_namespace_attributes,
+};
+
+static const struct attribute_group *nd_namespace_attribute_groups[] = {
+ &nd_device_attribute_group,
+ &nd_namespace_attribute_group,
+ NULL,
+};
+
+static struct device **create_namespace_io(struct nd_region *nd_region)
+{
+ struct nd_namespace_io *nsio;
+ struct device *dev, **devs;
+ struct resource *res;
+
+ nsio = kzalloc(sizeof(*nsio), GFP_KERNEL);
+ if (!nsio)
+ return NULL;
+
+ devs = kcalloc(2, sizeof(struct device *), GFP_KERNEL);
+ if (!devs) {
+ kfree(nsio);
+ return NULL;
+ }
+
+ dev = &nsio->dev;
+ dev->type = &namespace_io_device_type;
+ res = &nsio->res;
+ res->name = dev_name(&nd_region->dev);
+ res->flags = IORESOURCE_MEM;
+ res->start = nd_region->ndr_start;
+ res->end = res->start + nd_region->ndr_size - 1;
+
+ devs[0] = dev;
+ return devs;
+}
+
+int nd_region_register_namespaces(struct nd_region *nd_region, int *err)
+{
+ struct device **devs = NULL;
+ int i;
+
+ *err = 0;
+ switch (nd_region_to_namespace_type(nd_region)) {
+ case ND_DEVICE_NAMESPACE_IO:
+ devs = create_namespace_io(nd_region);
+ break;
+ default:
+ break;
+ }
+
+ if (!devs)
+ return -ENODEV;
+
+ for (i = 0; devs[i]; i++) {
+ struct device *dev = devs[i];
+
+ dev_set_name(dev, "namespace%d.%d", nd_region->id, i);
+ dev->parent = &nd_region->dev;
+ dev->groups = nd_namespace_attribute_groups;
+ nd_device_register(dev);
+ }
+ kfree(devs);
+
+ return i;
+}
diff --git a/drivers/nvdimm/nd-private.h b/drivers/nvdimm/nd-private.h
index 9ac24c975251..85536c3556a1 100644
--- a/drivers/nvdimm/nd-private.h
+++ b/drivers/nvdimm/nd-private.h
@@ -21,9 +21,11 @@ extern int nvdimm_major;
struct nvdimm_bus {
struct nvdimm_bus_descriptor *nd_desc;
+ struct module *module;
struct list_head list;
struct device dev;
int id;
+ struct mutex reconfig_mutex;
};
struct nvdimm {
@@ -34,6 +36,9 @@ struct nvdimm {
int id;
};
+bool is_nvdimm(struct device *dev);
+bool is_nd_blk(struct device *dev);
+bool is_nd_pmem(struct device *dev);
struct nvdimm_bus *walk_to_nvdimm_bus(struct device *nd_dev);
int __init nvdimm_bus_init(void);
void nvdimm_bus_exit(void);
@@ -43,5 +48,4 @@ void nd_synchronize(void);
int nvdimm_bus_register_dimms(struct nvdimm_bus *nvdimm_bus);
int nvdimm_bus_register_regions(struct nvdimm_bus *nvdimm_bus);
int nd_match_dimm(struct device *dev, void *data);
-bool is_nvdimm(struct device *dev);
#endif /* __ND_PRIVATE_H__ */
diff --git a/drivers/nvdimm/nd.h b/drivers/nvdimm/nd.h
index ea0cca337aa6..9d0c03e0d71e 100644
--- a/drivers/nvdimm/nd.h
+++ b/drivers/nvdimm/nd.h
@@ -23,6 +23,11 @@ struct nvdimm_drvdata {
void *data;
};
+struct nd_region_namespaces {
+ int count;
+ int active;
+};
+
struct nd_region {
struct device dev;
u16 ndr_mappings;
@@ -41,7 +46,15 @@ enum nd_async_mode {
void nd_device_register(struct device *dev);
void nd_device_unregister(struct device *dev, enum nd_async_mode mode);
int __init nvdimm_init(void);
+int __init nd_region_init(void);
void nvdimm_exit(void);
+void nd_region_exit(void);
int nvdimm_init_nsarea(struct nvdimm_drvdata *ndd);
int nvdimm_init_config_data(struct nvdimm_drvdata *ndd);
+struct nd_region *to_nd_region(struct device *dev);
+int nd_region_to_namespace_type(struct nd_region *nd_region);
+int nd_region_register_namespaces(struct nd_region *nd_region, int *err);
+void nvdimm_bus_lock(struct device *dev);
+void nvdimm_bus_unlock(struct device *dev);
+bool is_nvdimm_bus_locked(struct device *dev);
#endif /* __ND_H__ */
diff --git a/drivers/nvdimm/region.c b/drivers/nvdimm/region.c
new file mode 100644
index 000000000000..ade3dba81afd
--- /dev/null
+++ b/drivers/nvdimm/region.c
@@ -0,0 +1,93 @@
+/*
+ * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ */
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/nd.h>
+#include "nd.h"
+
+static int nd_region_probe(struct device *dev)
+{
+ int err;
+ struct nd_region_namespaces *num_ns;
+ struct nd_region *nd_region = to_nd_region(dev);
+ int rc = nd_region_register_namespaces(nd_region, &err);
+
+ num_ns = devm_kzalloc(dev, sizeof(*num_ns), GFP_KERNEL);
+ if (!num_ns)
+ return -ENOMEM;
+
+ if (rc < 0)
+ return rc;
+
+ num_ns->active = rc;
+ num_ns->count = rc + err;
+ dev_set_drvdata(dev, num_ns);
+
+ if (err == 0)
+ return 0;
+
+ if (rc == err)
+ return -ENODEV;
+
+ /*
+ * Given multiple namespaces per region, we do not want to
+ * disable all the successfully registered peer namespaces upon
+ * a single registration failure. If userspace is missing a
+ * namespace that it expects it can disable/re-enable the region
+ * to retry discovery after correcting the failure.
+ * <regionX>/namespaces returns the current
+ * "<async-registered>/<total>" namespace count.
+ */
+ dev_err(dev, "failed to register %d namespace%s, continuing...\n",
+ err, err == 1 ? "" : "s");
+ return 0;
+}
+
+static int child_unregister(struct device *dev, void *data)
+{
+ nd_device_unregister(dev, ND_SYNC);
+ return 0;
+}
+
+static int nd_region_remove(struct device *dev)
+{
+ /* flush attribute readers and disable */
+ nvdimm_bus_lock(dev);
+ dev_set_drvdata(dev, NULL);
+ nvdimm_bus_unlock(dev);
+
+ device_for_each_child(dev, NULL, child_unregister);
+ return 0;
+}
+
+static struct nd_device_driver nd_region_driver = {
+ .probe = nd_region_probe,
+ .remove = nd_region_remove,
+ .drv = {
+ .name = "nd_region",
+ },
+ .type = ND_DRIVER_REGION_BLK | ND_DRIVER_REGION_PMEM,
+};
+
+int __init nd_region_init(void)
+{
+ return nd_driver_register(&nd_region_driver);
+}
+
+void nd_region_exit(void)
+{
+ driver_unregister(&nd_region_driver.drv);
+}
+
+MODULE_ALIAS_ND_DEVICE(ND_DEVICE_REGION_PMEM);
+MODULE_ALIAS_ND_DEVICE(ND_DEVICE_REGION_BLK);
diff --git a/drivers/nvdimm/region_devs.c b/drivers/nvdimm/region_devs.c
index c6fdf3cea2d1..497177d91257 100644
--- a/drivers/nvdimm/region_devs.c
+++ b/drivers/nvdimm/region_devs.c
@@ -47,11 +47,16 @@ static struct device_type nd_volatile_device_type = {
.release = nd_region_release,
};
-static bool is_nd_pmem(struct device *dev)
+bool is_nd_pmem(struct device *dev)
{
return dev ? dev->type == &nd_pmem_device_type : false;
}
+bool is_nd_blk(struct device *dev)
+{
+ return dev ? dev->type == &nd_blk_device_type : false;
+}
+
struct nd_region *to_nd_region(struct device *dev)
{
struct nd_region *nd_region = container_of(dev, struct nd_region, dev);
@@ -61,6 +66,37 @@ struct nd_region *to_nd_region(struct device *dev)
}
EXPORT_SYMBOL_GPL(to_nd_region);
+/**
+ * nd_region_to_namespace_type() - region to an integer namespace type
+ * @nd_region: region-device to interrogate
+ *
+ * This is the 'nstype' attribute of a region as well, an input to the
+ * MODALIAS for namespace devices, and bit number for a nvdimm_bus to match
+ * namespace devices with namespace drivers.
+ */
+int nd_region_to_namespace_type(struct nd_region *nd_region)
+{
+ if (is_nd_pmem(&nd_region->dev)) {
+ u16 i, alias;
+
+ for (i = 0, alias = 0; i < nd_region->ndr_mappings; i++) {
+ struct nd_mapping *nd_mapping = &nd_region->mapping[i];
+ struct nvdimm *nvdimm = nd_mapping->nvdimm;
+
+ if (nvdimm->flags & NDD_ALIASING)
+ alias++;
+ }
+ if (alias)
+ return ND_DEVICE_NAMESPACE_PMEM;
+ else
+ return ND_DEVICE_NAMESPACE_IO;
+ } else if (is_nd_blk(&nd_region->dev)) {
+ return ND_DEVICE_NAMESPACE_BLK;
+ }
+
+ return 0;
+}
+
static ssize_t size_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
@@ -88,9 +124,37 @@ static ssize_t mappings_show(struct device *dev,
}
static DEVICE_ATTR_RO(mappings);
+static ssize_t nstype_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct nd_region *nd_region = to_nd_region(dev);
+
+ return sprintf(buf, "%d\n", nd_region_to_namespace_type(nd_region));
+}
+static DEVICE_ATTR_RO(nstype);
+
+static ssize_t init_namespaces_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct nd_region_namespaces *num_ns = dev_get_drvdata(dev);
+ ssize_t rc;
+
+ nvdimm_bus_lock(dev);
+ if (num_ns)
+ rc = sprintf(buf, "%d/%d\n", num_ns->active, num_ns->count);
+ else
+ rc = -ENXIO;
+ nvdimm_bus_unlock(dev);
+
+ return rc;
+}
+static DEVICE_ATTR_RO(init_namespaces);
+
static struct attribute *nd_region_attributes[] = {
&dev_attr_size.attr,
+ &dev_attr_nstype.attr,
&dev_attr_mappings.attr,
+ &dev_attr_init_namespaces.attr,
NULL,
};
diff --git a/include/linux/libnvdimm.h b/include/linux/libnvdimm.h
index 4de60198a778..883466f730c8 100644
--- a/include/linux/libnvdimm.h
+++ b/include/linux/libnvdimm.h
@@ -71,8 +71,11 @@ struct nd_region_desc {
struct nvdimm_bus;
struct device;
-struct nvdimm_bus *nvdimm_bus_register(struct device *parent,
- struct nvdimm_bus_descriptor *nfit_desc);
+struct module;
+struct nvdimm_bus *__nvdimm_bus_register(struct device *parent,
+ struct nvdimm_bus_descriptor *nfit_desc, struct module *module);
+#define nvdimm_bus_register(parent, desc) \
+ __nvdimm_bus_register(parent, desc, THIS_MODULE)
void nvdimm_bus_unregister(struct nvdimm_bus *nvdimm_bus);
struct nvdimm_bus *to_nvdimm_bus(struct device *dev);
struct nvdimm *to_nvdimm(struct device *dev);
diff --git a/include/linux/nd.h b/include/linux/nd.h
index e074f67e53a3..da70e9962197 100644
--- a/include/linux/nd.h
+++ b/include/linux/nd.h
@@ -26,6 +26,16 @@ static inline struct nd_device_driver *to_nd_device_driver(
struct device_driver *drv)
{
return container_of(drv, struct nd_device_driver, drv);
+};
+
+struct nd_namespace_io {
+ struct device dev;
+ struct resource res;
+};
+
+static inline struct nd_namespace_io *to_nd_namespace_io(struct device *dev)
+{
+ return container_of(dev, struct nd_namespace_io, dev);
}
#define MODULE_ALIAS_ND_DEVICE(type) \
diff --git a/include/uapi/linux/ndctl.h b/include/uapi/linux/ndctl.h
index 3e9341db4925..6e434a7863b8 100644
--- a/include/uapi/linux/ndctl.h
+++ b/include/uapi/linux/ndctl.h
@@ -177,8 +177,18 @@ static inline const char *nvdimm_cmd_name(unsigned cmd)
#define ND_DEVICE_DIMM 1 /* nd_dimm: container for "config data" */
+#define ND_DEVICE_REGION_PMEM 2 /* nd_region: (parent of pmem namespaces) */
+#define ND_DEVICE_REGION_BLK 3 /* nd_region: (parent of blk namespaces) */
+#define ND_DEVICE_NAMESPACE_IO 4 /* legacy persistent memory */
+#define ND_DEVICE_NAMESPACE_PMEM 5 /* persistent memory namespace (may alias) */
+#define ND_DEVICE_NAMESPACE_BLK 6 /* block-data-window namespace (may alias) */
enum nd_driver_flags {
ND_DRIVER_DIMM = 1 << ND_DEVICE_DIMM,
+ ND_DRIVER_REGION_PMEM = 1 << ND_DEVICE_REGION_PMEM,
+ ND_DRIVER_REGION_BLK = 1 << ND_DEVICE_REGION_BLK,
+ ND_DRIVER_NAMESPACE_IO = 1 << ND_DEVICE_NAMESPACE_IO,
+ ND_DRIVER_NAMESPACE_PMEM = 1 << ND_DEVICE_NAMESPACE_PMEM,
+ ND_DRIVER_NAMESPACE_BLK = 1 << ND_DEVICE_NAMESPACE_BLK,
};
#endif /* __NDCTL_H__ */
^ permalink raw reply related [flat|nested] 47+ messages in thread
* [PATCH v5 09/21] libnvdimm, nd_pmem: add libnvdimm support to the pmem driver
2015-06-02 0:14 [PATCH v5 00/21] libnvdimm: non-volatile memory devices Dan Williams
` (7 preceding siblings ...)
2015-06-02 0:14 ` [PATCH v5 08/21] libnvdimm: support for legacy (non-aliasing) nvdimms Dan Williams
@ 2015-06-02 0:14 ` Dan Williams
2015-06-03 7:44 ` Christoph Hellwig
2015-06-02 0:15 ` [PATCH v5 10/21] pmem: Dynamically allocate partition numbers Dan Williams
` (11 subsequent siblings)
20 siblings, 1 reply; 47+ messages in thread
From: Dan Williams @ 2015-06-02 0:14 UTC (permalink / raw)
To: linux-nvdimm
Cc: axboe, sfr, rafael, neilb, gregkh, linux-kernel, mingo,
linux-acpi, jmoyer, linux-api, akpm, hch
nd_pmem attaches to persistent memory regions and namespaces emitted by
the libnvdimm subsystem, and, same as the original pmem driver, presents
the system-physical-address range as a block device.
The existing e820-type-12 to pmem setup is converted to a full libnvdimm
bus that emits an nd_namespace_io device.
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Boaz Harrosh <boaz@plexistor.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Jens Axboe <axboe@fb.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
arch/x86/Kconfig | 4 ++
arch/x86/kernel/pmem.c | 92 +++++++++++++++++++++++++++++++----------------
drivers/block/Kconfig | 11 ------
drivers/block/Makefile | 1 -
drivers/nvdimm/Kconfig | 17 +++++++++
drivers/nvdimm/Makefile | 3 ++
drivers/nvdimm/pmem.c | 60 +++++++++++++++----------------
7 files changed, 113 insertions(+), 75 deletions(-)
rename drivers/{block/pmem.c => nvdimm/pmem.c} (85%)
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 226d5696e1d1..3fa273d47bba 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1424,6 +1424,10 @@ source "mm/Kconfig"
config X86_PMEM_LEGACY
bool "Support non-standard NVDIMMs and ADR protected memory"
+ depends on PHYS_ADDR_T_64BIT
+ depends on BLK_DEV
+ select NVDIMM_DEVICES
+ select LIBNVDIMM
help
Treat memory marked using the non-standard e820 type of 12 as used
by the Intel Sandy Bridge-EP reference BIOS as protected memory.
diff --git a/arch/x86/kernel/pmem.c b/arch/x86/kernel/pmem.c
index 3420c874ddc5..40d734c8e3b1 100644
--- a/arch/x86/kernel/pmem.c
+++ b/arch/x86/kernel/pmem.c
@@ -1,53 +1,81 @@
/*
* Copyright (c) 2015, Christoph Hellwig.
+ * Copyright (c) 2015, Intel Corporation.
*/
-#include <linux/memblock.h>
#include <linux/platform_device.h>
-#include <linux/slab.h>
+#include <linux/libnvdimm.h>
+#include <linux/module.h>
#include <asm/e820.h>
-#include <asm/page_types.h>
-#include <asm/setup.h>
-static __init void register_pmem_device(struct resource *res)
+static void e820_pmem_release(struct device *dev)
{
- struct platform_device *pdev;
- int error;
+ struct nvdimm_bus *nvdimm_bus = dev->platform_data;
- pdev = platform_device_alloc("pmem", PLATFORM_DEVID_AUTO);
- if (!pdev)
- return;
+ if (nvdimm_bus)
+ nvdimm_bus_unregister(nvdimm_bus);
+}
- error = platform_device_add_resources(pdev, res, 1);
- if (error)
- goto out_put_pdev;
+static struct platform_device e820_pmem = {
+ .name = "e820_pmem",
+ .id = -1,
+ .dev = {
+ .release = e820_pmem_release,
+ },
+};
- error = platform_device_add(pdev);
- if (error)
- goto out_put_pdev;
- return;
+static const struct attribute_group *e820_pmem_attribute_groups[] = {
+ &nvdimm_bus_attribute_group,
+ NULL,
+};
-out_put_pdev:
- dev_warn(&pdev->dev, "failed to add 'pmem' (persistent memory) device!\n");
- platform_device_put(pdev);
-}
+static const struct attribute_group *e820_pmem_region_attribute_groups[] = {
+ &nd_region_attribute_group,
+ &nd_device_attribute_group,
+ NULL,
+};
-static __init int register_pmem_devices(void)
+static __init int register_e820_pmem(void)
{
- int i;
+ static struct nvdimm_bus_descriptor nd_desc;
+ struct device *dev = &e820_pmem.dev;
+ struct nvdimm_bus *nvdimm_bus;
+ int rc, i;
+
+ rc = platform_device_register(&e820_pmem);
+ if (rc)
+ return rc;
+
+ nd_desc.attr_groups = e820_pmem_attribute_groups;
+ nd_desc.provider_name = "e820";
+ nvdimm_bus = nvdimm_bus_register(dev, &nd_desc);
+ if (!nvdimm_bus)
+ goto err;
+ dev->platform_data = nvdimm_bus;
for (i = 0; i < e820.nr_map; i++) {
struct e820entry *ei = &e820.map[i];
+ struct resource res = {
+ .flags = IORESOURCE_MEM,
+ .start = ei->addr,
+ .end = ei->addr + ei->size - 1,
+ };
+ struct nd_region_desc ndr_desc;
+
+ if (ei->type != E820_PRAM)
+ continue;
- if (ei->type == E820_PRAM) {
- struct resource res = {
- .flags = IORESOURCE_MEM,
- .start = ei->addr,
- .end = ei->addr + ei->size - 1,
- };
- register_pmem_device(&res);
- }
+ memset(&ndr_desc, 0, sizeof(ndr_desc));
+ ndr_desc.res = &res;
+ ndr_desc.attr_groups = e820_pmem_region_attribute_groups;
+ if (!nvdimm_pmem_region_create(nvdimm_bus, &ndr_desc))
+ goto err;
}
return 0;
+
+ err:
+ dev_err(dev, "failed to register legacy persistent memory ranges\n");
+ platform_device_unregister(&e820_pmem);
+ return -ENXIO;
}
-device_initcall(register_pmem_devices);
+late_initcall(register_e820_pmem);
diff --git a/drivers/block/Kconfig b/drivers/block/Kconfig
index eb1fed5bd516..1b8094d4d7af 100644
--- a/drivers/block/Kconfig
+++ b/drivers/block/Kconfig
@@ -404,17 +404,6 @@ config BLK_DEV_RAM_DAX
and will prevent RAM block device backing store memory from being
allocated from highmem (only a problem for highmem systems).
-config BLK_DEV_PMEM
- tristate "Persistent memory block device support"
- help
- Saying Y here will allow you to use a contiguous range of reserved
- memory as one or more persistent block devices.
-
- To compile this driver as a module, choose M here: the module will be
- called 'pmem'.
-
- If unsure, say N.
-
config CDROM_PKTCDVD
tristate "Packet writing on CD/DVD media"
depends on !UML
diff --git a/drivers/block/Makefile b/drivers/block/Makefile
index 9cc6c18a1c7e..02b688d1438d 100644
--- a/drivers/block/Makefile
+++ b/drivers/block/Makefile
@@ -14,7 +14,6 @@ obj-$(CONFIG_PS3_VRAM) += ps3vram.o
obj-$(CONFIG_ATARI_FLOPPY) += ataflop.o
obj-$(CONFIG_AMIGA_Z2RAM) += z2ram.o
obj-$(CONFIG_BLK_DEV_RAM) += brd.o
-obj-$(CONFIG_BLK_DEV_PMEM) += pmem.o
obj-$(CONFIG_BLK_DEV_LOOP) += loop.o
obj-$(CONFIG_BLK_CPQ_DA) += cpqarray.o
obj-$(CONFIG_BLK_CPQ_CISS_DA) += cciss.o
diff --git a/drivers/nvdimm/Kconfig b/drivers/nvdimm/Kconfig
index 24b51dbc8215..020acf860258 100644
--- a/drivers/nvdimm/Kconfig
+++ b/drivers/nvdimm/Kconfig
@@ -17,4 +17,21 @@ if NVDIMM_DEVICES
config LIBNVDIMM
tristate
+config BLK_DEV_PMEM
+ tristate "PMEM: Persistent memory block device support"
+ depends on LIBNVDIMM
+ default LIBNVDIMM
+ help
+ Memory ranges for PMEM are described by either an NFIT
+ (NVDIMM Firmware Interface Table, see CONFIG_NFIT_ACPI), a
+ non-standard OEM-specific E820 memory type (type-12, see
+ CONFIG_X86_PMEM_LEGACY), or it is manually specified by the
+ 'memmap=nn[KMG]!ss[KMG]' kernel command line (see
+ Documentation/kernel-parameters.txt). This driver converts
+ these persistent memory ranges into block devices that are
+ capable of DAX (direct-access) file system mappings. See
+ Documentation/blockdev/nd.txt for more details.
+
+ Say Y if you want to use a NVDIMM described by NFIT
+
endif
diff --git a/drivers/nvdimm/Makefile b/drivers/nvdimm/Makefile
index af5e2760ddbd..4d2a27f52faa 100644
--- a/drivers/nvdimm/Makefile
+++ b/drivers/nvdimm/Makefile
@@ -1,4 +1,7 @@
obj-$(CONFIG_LIBNVDIMM) += libnvdimm.o
+obj-$(CONFIG_BLK_DEV_PMEM) += nd_pmem.o
+
+nd_pmem-y := pmem.o
libnvdimm-y := core.o
libnvdimm-y += bus.o
diff --git a/drivers/block/pmem.c b/drivers/nvdimm/pmem.c
similarity index 85%
rename from drivers/block/pmem.c
rename to drivers/nvdimm/pmem.c
index eabf4a8d0085..cf5d53eda9e5 100644
--- a/drivers/block/pmem.c
+++ b/drivers/nvdimm/pmem.c
@@ -1,7 +1,7 @@
/*
* Persistent Memory Driver
*
- * Copyright (c) 2014, Intel Corporation.
+ * Copyright (c) 2014-2015, Intel Corporation.
* Copyright (c) 2015, Christoph Hellwig <hch@lst.de>.
* Copyright (c) 2015, Boaz Harrosh <boaz@plexistor.com>.
*
@@ -23,6 +23,8 @@
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/slab.h>
+#include <linux/nd.h>
+#include "nd.h"
#define PMEM_MINORS 16
@@ -37,7 +39,6 @@ struct pmem_device {
};
static int pmem_major;
-static atomic_t pmem_index;
static void pmem_do_bvec(struct pmem_device *pmem, struct page *page,
unsigned int len, unsigned int off, int rw,
@@ -118,11 +119,11 @@ static const struct block_device_operations pmem_fops = {
.direct_access = pmem_direct_access,
};
-static struct pmem_device *pmem_alloc(struct device *dev, struct resource *res)
+static struct pmem_device *pmem_alloc(struct device *dev, struct resource *res, int id)
{
struct pmem_device *pmem;
struct gendisk *disk;
- int idx, err;
+ int err;
err = -ENOMEM;
pmem = kzalloc(sizeof(*pmem), GFP_KERNEL);
@@ -159,15 +160,13 @@ static struct pmem_device *pmem_alloc(struct device *dev, struct resource *res)
if (!disk)
goto out_free_queue;
- idx = atomic_inc_return(&pmem_index) - 1;
-
disk->major = pmem_major;
- disk->first_minor = PMEM_MINORS * idx;
+ disk->first_minor = PMEM_MINORS * id;
disk->fops = &pmem_fops;
disk->private_data = pmem;
disk->queue = pmem->pmem_queue;
disk->flags = GENHD_FL_EXT_DEVT;
- sprintf(disk->disk_name, "pmem%d", idx);
+ sprintf(disk->disk_name, "pmem%d", id);
disk->driverfs_dev = dev;
set_capacity(disk, pmem->size >> 9);
pmem->pmem_disk = disk;
@@ -198,42 +197,38 @@ static void pmem_free(struct pmem_device *pmem)
kfree(pmem);
}
-static int pmem_probe(struct platform_device *pdev)
+static int nd_pmem_probe(struct device *dev)
{
+ struct nd_region *nd_region = to_nd_region(dev->parent);
+ struct nd_namespace_io *nsio = to_nd_namespace_io(dev);
struct pmem_device *pmem;
- struct resource *res;
-
- if (WARN_ON(pdev->num_resources > 1))
- return -ENXIO;
-
- res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (!res)
- return -ENXIO;
- pmem = pmem_alloc(&pdev->dev, res);
+ pmem = pmem_alloc(dev, &nsio->res, nd_region->id);
if (IS_ERR(pmem))
return PTR_ERR(pmem);
- platform_set_drvdata(pdev, pmem);
+ dev_set_drvdata(dev, pmem);
return 0;
}
-static int pmem_remove(struct platform_device *pdev)
+static int nd_pmem_remove(struct device *dev)
{
- struct pmem_device *pmem = platform_get_drvdata(pdev);
+ struct pmem_device *pmem = dev_get_drvdata(dev);
pmem_free(pmem);
return 0;
}
-static struct platform_driver pmem_driver = {
- .probe = pmem_probe,
- .remove = pmem_remove,
- .driver = {
- .owner = THIS_MODULE,
- .name = "pmem",
+MODULE_ALIAS("pmem");
+MODULE_ALIAS_ND_DEVICE(ND_DEVICE_NAMESPACE_IO);
+static struct nd_device_driver nd_pmem_driver = {
+ .probe = nd_pmem_probe,
+ .remove = nd_pmem_remove,
+ .drv = {
+ .name = "nd_pmem",
},
+ .type = ND_DRIVER_NAMESPACE_IO,
};
static int __init pmem_init(void)
@@ -244,16 +239,19 @@ static int __init pmem_init(void)
if (pmem_major < 0)
return pmem_major;
- error = platform_driver_register(&pmem_driver);
- if (error)
+ error = nd_driver_register(&nd_pmem_driver);
+ if (error) {
unregister_blkdev(pmem_major, "pmem");
- return error;
+ return error;
+ }
+
+ return 0;
}
module_init(pmem_init);
static void pmem_exit(void)
{
- platform_driver_unregister(&pmem_driver);
+ driver_unregister(&nd_pmem_driver.drv);
unregister_blkdev(pmem_major, "pmem");
}
module_exit(pmem_exit);
^ permalink raw reply related [flat|nested] 47+ messages in thread
* [PATCH v5 10/21] pmem: Dynamically allocate partition numbers
2015-06-02 0:14 [PATCH v5 00/21] libnvdimm: non-volatile memory devices Dan Williams
` (8 preceding siblings ...)
2015-06-02 0:14 ` [PATCH v5 09/21] libnvdimm, nd_pmem: add libnvdimm support to the pmem driver Dan Williams
@ 2015-06-02 0:15 ` Dan Williams
2015-06-02 0:15 ` [PATCH v5 11/21] libnvdimm, nfit: add interleave-set state-tracking infrastructure Dan Williams
` (10 subsequent siblings)
20 siblings, 0 replies; 47+ messages in thread
From: Dan Williams @ 2015-06-02 0:15 UTC (permalink / raw)
To: linux-nvdimm
Cc: axboe, sfr, rafael, neilb, gregkh, linux-kernel, mingo,
linux-acpi, jmoyer, linux-api, akpm, hch
From: Ross Zwisler <ross.zwisler@linux.intel.com>
Dynamically allocate minor numbers for partitions instead of statically
preallocating them.
It gives us a simpler minors scheme, and makes it so we get a consistent
major when moving past partition 16. Here's what happens with the
current code:
pmem0 249:0 0 63.5G 0 rom
├─pmem0p1 249:1 0 1G 0 part
├─pmem0p2 249:2 0 1G 0 part
├─pmem0p3 249:3 0 1G 0 part
├─pmem0p4 249:4 0 1G 0 part
├─pmem0p5 249:5 0 1G 0 part
├─pmem0p6 249:6 0 1G 0 part
├─pmem0p7 249:7 0 1G 0 part
├─pmem0p8 249:8 0 1G 0 part
├─pmem0p9 249:9 0 1G 0 part
├─pmem0p10 249:10 0 1G 0 part
├─pmem0p11 249:11 0 1G 0 part
├─pmem0p12 249:12 0 1G 0 part
├─pmem0p13 249:13 0 1G 0 part
├─pmem0p14 249:14 0 1G 0 part
├─pmem0p15 249:15 0 1G 0 part
├─pmem0p16 259:0 0 1G 0 part
├─pmem0p17 259:1 0 1G 0 part
└─pmem0p18 259:2 0 1G 0 part
Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
drivers/nvdimm/pmem.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c
index cf5d53eda9e5..0842d27ffc8d 100644
--- a/drivers/nvdimm/pmem.c
+++ b/drivers/nvdimm/pmem.c
@@ -26,8 +26,6 @@
#include <linux/nd.h>
#include "nd.h"
-#define PMEM_MINORS 16
-
struct pmem_device {
struct request_queue *pmem_queue;
struct gendisk *pmem_disk;
@@ -156,12 +154,12 @@ static struct pmem_device *pmem_alloc(struct device *dev, struct resource *res,
blk_queue_max_hw_sectors(pmem->pmem_queue, 1024);
blk_queue_bounce_limit(pmem->pmem_queue, BLK_BOUNCE_ANY);
- disk = alloc_disk(PMEM_MINORS);
+ disk = alloc_disk(0);
if (!disk)
goto out_free_queue;
disk->major = pmem_major;
- disk->first_minor = PMEM_MINORS * id;
+ disk->first_minor = 0;
disk->fops = &pmem_fops;
disk->private_data = pmem;
disk->queue = pmem->pmem_queue;
^ permalink raw reply related [flat|nested] 47+ messages in thread
* [PATCH v5 11/21] libnvdimm, nfit: add interleave-set state-tracking infrastructure
2015-06-02 0:14 [PATCH v5 00/21] libnvdimm: non-volatile memory devices Dan Williams
` (9 preceding siblings ...)
2015-06-02 0:15 ` [PATCH v5 10/21] pmem: Dynamically allocate partition numbers Dan Williams
@ 2015-06-02 0:15 ` Dan Williams
2015-06-02 0:15 ` [PATCH v5 12/21] libnvdimm: namespace indices: read and validate Dan Williams
` (9 subsequent siblings)
20 siblings, 0 replies; 47+ messages in thread
From: Dan Williams @ 2015-06-02 0:15 UTC (permalink / raw)
To: linux-nvdimm
Cc: axboe, sfr, rafael, neilb, gregkh, linux-kernel, mingo,
linux-acpi, jmoyer, linux-api, akpm, hch
On platforms that have firmware support for reading/writing per-dimm
label space, a portion of the dimm may be accessible via an interleave
set PMEM mapping in addition to the dimm's BLK (block-data-window
aperture(s)) interface. A label, stored in a "configuration data
region" on the dimm, disambiguates which dimm addresses are accessed
through which exclusive interface.
Add infrastructure that allows the kernel to block modifications to a
label in the set while any member dimm is active. Note that this is
meant only for enforcing "no modifications of active labels" via the
coarse ioctl command. Adding/deleting namespaces from an active
interleave set is always possible via sysfs.
Another aspect of tracking interleave sets is tracking their integrity
when DIMMs in a set are physically re-ordered. For this purpose we
generate an "interleave-set cookie" that can be recorded in a label and
validated against the current configuration. It is the bus provider
implementation's responsibility to calculate the interleave set cookie
and attach it to a given region.
Cc: Neil Brown <neilb@suse.de>
Cc: <linux-acpi@vger.kernel.org>
Cc: Greg KH <gregkh@linuxfoundation.org>
Cc: Robert Moore <robert.moore@intel.com>
Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
drivers/acpi/nfit.c | 91 ++++++++++++++++++++++++++++++++++++++++++
drivers/nvdimm/bus.c | 41 ++++++++++++++++++-
drivers/nvdimm/core.c | 17 ++++++++
drivers/nvdimm/dimm_devs.c | 19 ++++++++-
drivers/nvdimm/nd-private.h | 11 +++++
drivers/nvdimm/nd.h | 1
drivers/nvdimm/region_devs.c | 85 +++++++++++++++++++++++++++++++++++++++
include/linux/libnvdimm.h | 6 +++
8 files changed, 267 insertions(+), 4 deletions(-)
diff --git a/drivers/acpi/nfit.c b/drivers/acpi/nfit.c
index b8e0a762692f..2eb26069c1da 100644
--- a/drivers/acpi/nfit.c
+++ b/drivers/acpi/nfit.c
@@ -16,6 +16,7 @@
#include <linux/ndctl.h>
#include <linux/list.h>
#include <linux/acpi.h>
+#include <linux/sort.h>
#include "nfit.h"
static bool force_enable_dimms;
@@ -743,6 +744,91 @@ static const struct attribute_group *acpi_nfit_region_attribute_groups[] = {
NULL,
};
+/* enough info to uniquely specify an interleave set */
+struct nfit_set_info {
+ struct nfit_set_info_map {
+ u64 region_offset;
+ u32 serial_number;
+ u32 pad;
+ } mapping[0];
+};
+
+static size_t sizeof_nfit_set_info(int num_mappings)
+{
+ return sizeof(struct nfit_set_info)
+ + num_mappings * sizeof(struct nfit_set_info_map);
+}
+
+static int cmp_map(const void *m0, const void *m1)
+{
+ const struct nfit_set_info_map *map0 = m0;
+ const struct nfit_set_info_map *map1 = m1;
+
+ return memcmp(&map0->region_offset, &map1->region_offset,
+ sizeof(u64));
+}
+
+/* Retrieve the nth entry referencing this spa */
+static struct acpi_nfit_memory_map *memdev_from_spa(
+ struct acpi_nfit_desc *acpi_desc, u16 range_index, int n)
+{
+ struct nfit_memdev *nfit_memdev;
+
+ list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list)
+ if (nfit_memdev->memdev->range_index == range_index)
+ if (n-- == 0)
+ return nfit_memdev->memdev;
+ return NULL;
+}
+
+static int acpi_nfit_init_interleave_set(struct acpi_nfit_desc *acpi_desc,
+ struct nd_region_desc *ndr_desc,
+ struct acpi_nfit_system_address *spa)
+{
+ u16 num_mappings = ndr_desc->num_mappings;
+ int i, spa_type = nfit_spa_type(spa);
+ struct device *dev = acpi_desc->dev;
+ struct nd_interleave_set *nd_set;
+ struct nfit_set_info *info;
+
+ if (spa_type == NFIT_SPA_PM || spa_type == NFIT_SPA_VOLATILE)
+ /* pass */;
+ else
+ return 0;
+
+ nd_set = devm_kzalloc(dev, sizeof(*nd_set), GFP_KERNEL);
+ if (!nd_set)
+ return -ENOMEM;
+
+ info = devm_kzalloc(dev, sizeof_nfit_set_info(num_mappings), GFP_KERNEL);
+ if (!info)
+ return -ENOMEM;
+ for (i = 0; i < num_mappings; i++) {
+ struct nd_mapping *nd_mapping = &ndr_desc->nd_mapping[i];
+ struct nfit_set_info_map *map = &info->mapping[i];
+ struct nvdimm *nvdimm = nd_mapping->nvdimm;
+ struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
+ struct acpi_nfit_memory_map *memdev = memdev_from_spa(acpi_desc,
+ spa->range_index, i);
+
+ if (!memdev || !nfit_mem->dcr) {
+ dev_err(dev, "%s: failed to find DCR\n", __func__);
+ return -ENODEV;
+ }
+
+ map->region_offset = memdev->region_offset;
+ map->serial_number = nfit_mem->dcr->serial_number;
+ }
+
+ sort(&info->mapping[0], num_mappings, sizeof(struct nfit_set_info_map),
+ cmp_map, NULL);
+ nd_set->cookie = nd_fletcher64(info, sizeof_nfit_set_info(num_mappings), 0);
+ ndr_desc->nd_set = nd_set;
+ devm_kfree(dev, info);
+
+ return 0;
+}
+
static int acpi_nfit_register_region(struct acpi_nfit_desc *acpi_desc,
struct nfit_spa *nfit_spa)
{
@@ -750,7 +836,7 @@ static int acpi_nfit_register_region(struct acpi_nfit_desc *acpi_desc,
struct acpi_nfit_system_address *spa = nfit_spa->spa;
struct nfit_memdev *nfit_memdev;
struct nd_region_desc ndr_desc;
- int spa_type, count = 0;
+ int spa_type, count = 0, rc;
struct resource res;
u16 range_index;
@@ -816,6 +902,9 @@ static int acpi_nfit_register_region(struct acpi_nfit_desc *acpi_desc,
ndr_desc.nd_mapping = nd_mappings;
ndr_desc.num_mappings = count;
+ rc = acpi_nfit_init_interleave_set(acpi_desc, &ndr_desc, spa);
+ if (rc)
+ return rc;
if (spa_type == NFIT_SPA_PM) {
if (!nvdimm_pmem_region_create(acpi_desc->nvdimm_bus, &ndr_desc))
return -ENOMEM;
diff --git a/drivers/nvdimm/bus.c b/drivers/nvdimm/bus.c
index eeffe9498275..54bf593043c7 100644
--- a/drivers/nvdimm/bus.c
+++ b/drivers/nvdimm/bus.c
@@ -78,7 +78,10 @@ static int nvdimm_bus_probe(struct device *dev)
if (!try_module_get(provider))
return -ENXIO;
+ nd_region_probe_start(nvdimm_bus, dev);
rc = nd_drv->probe(dev);
+ nd_region_probe_end(nvdimm_bus, dev, rc);
+
dev_dbg(&nvdimm_bus->dev, "%s.probe(%s) = %d\n", dev->driver->name,
dev_name(dev), rc);
if (rc != 0)
@@ -94,6 +97,8 @@ static int nvdimm_bus_remove(struct device *dev)
int rc;
rc = nd_drv->remove(dev);
+ nd_region_notify_remove(nvdimm_bus, dev, rc);
+
dev_dbg(&nvdimm_bus->dev, "%s.remove(%s) = %d\n", dev->driver->name,
dev_name(dev), rc);
module_put(provider);
@@ -359,6 +364,33 @@ u32 nd_cmd_out_size(struct nvdimm *nvdimm, int cmd,
}
EXPORT_SYMBOL_GPL(nd_cmd_out_size);
+static void wait_nvdimm_bus_probe_idle(struct nvdimm_bus *nvdimm_bus)
+{
+ do {
+ if (nvdimm_bus->probe_active == 0)
+ break;
+ nvdimm_bus_unlock(&nvdimm_bus->dev);
+ wait_event(nvdimm_bus->probe_wait, nvdimm_bus->probe_active == 0);
+ nvdimm_bus_lock(&nvdimm_bus->dev);
+ } while (true);
+}
+
+/* set_config requires an idle interleave set */
+static int nd_cmd_clear_to_send(struct nvdimm *nvdimm, unsigned int cmd)
+{
+ struct nvdimm_bus *nvdimm_bus;
+
+ if (!nvdimm || cmd != ND_CMD_SET_CONFIG_DATA)
+ return 0;
+
+ nvdimm_bus = walk_to_nvdimm_bus(&nvdimm->dev);
+ wait_nvdimm_bus_probe_idle(nvdimm_bus);
+
+ if (atomic_read(&nvdimm->busy))
+ return -EBUSY;
+ return 0;
+}
+
static int __nd_ioctl(struct nvdimm_bus *nvdimm_bus, struct nvdimm *nvdimm,
int read_only, unsigned int ioctl_cmd, unsigned long arg)
{
@@ -469,11 +501,18 @@ static int __nd_ioctl(struct nvdimm_bus *nvdimm_bus, struct nvdimm *nvdimm,
goto out;
}
+ nvdimm_bus_lock(&nvdimm_bus->dev);
+ rc = nd_cmd_clear_to_send(nvdimm, cmd);
+ if (rc)
+ goto out_unlock;
+
rc = nd_desc->ndctl(nd_desc, nvdimm, cmd, buf, buf_len);
if (rc < 0)
- goto out;
+ goto out_unlock;
if (copy_to_user(p, buf, buf_len))
rc = -EFAULT;
+ out_unlock:
+ nvdimm_bus_unlock(&nvdimm_bus->dev);
out:
vfree(buf);
return rc;
diff --git a/drivers/nvdimm/core.c b/drivers/nvdimm/core.c
index df1a36565fb3..c128b949a500 100644
--- a/drivers/nvdimm/core.c
+++ b/drivers/nvdimm/core.c
@@ -54,6 +54,22 @@ bool is_nvdimm_bus_locked(struct device *dev)
}
EXPORT_SYMBOL(is_nvdimm_bus_locked);
+u64 nd_fletcher64(void *addr, size_t len, bool le)
+{
+ u32 *buf = addr;
+ u32 lo32 = 0;
+ u64 hi32 = 0;
+ int i;
+
+ for (i = 0; i < len / sizeof(u32); i++) {
+ lo32 += le ? le32_to_cpu(buf[i]) : buf[i];
+ hi32 += lo32;
+ }
+
+ return hi32 << 32 | lo32;
+}
+EXPORT_SYMBOL_GPL(nd_fletcher64);
+
static void nvdimm_bus_release(struct device *dev)
{
struct nvdimm_bus *nvdimm_bus = container_of(dev, struct nvdimm_bus, dev);
@@ -172,6 +188,7 @@ struct nvdimm_bus *__nvdimm_bus_register(struct device *parent,
if (!nvdimm_bus)
return NULL;
INIT_LIST_HEAD(&nvdimm_bus->list);
+ init_waitqueue_head(&nvdimm_bus->probe_wait);
nvdimm_bus->id = ida_simple_get(&nd_ida, 0, 0, GFP_KERNEL);
mutex_init(&nvdimm_bus->reconfig_mutex);
if (nvdimm_bus->id < 0) {
diff --git a/drivers/nvdimm/dimm_devs.c b/drivers/nvdimm/dimm_devs.c
index cb531a4c480d..55405d70f56a 100644
--- a/drivers/nvdimm/dimm_devs.c
+++ b/drivers/nvdimm/dimm_devs.c
@@ -185,7 +185,24 @@ static ssize_t commands_show(struct device *dev,
}
static DEVICE_ATTR_RO(commands);
+static ssize_t state_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct nvdimm *nvdimm = to_nvdimm(dev);
+
+ /*
+ * The state may be in the process of changing, userspace should
+ * quiesce probing if it wants a static answer
+ */
+ nvdimm_bus_lock(dev);
+ nvdimm_bus_unlock(dev);
+ return sprintf(buf, "%s\n", atomic_read(&nvdimm->busy)
+ ? "active" : "idle");
+}
+static DEVICE_ATTR_RO(state);
+
static struct attribute *nvdimm_attributes[] = {
+ &dev_attr_state.attr,
&dev_attr_commands.attr,
NULL,
};
@@ -213,7 +230,7 @@ struct nvdimm *nvdimm_create(struct nvdimm_bus *nvdimm_bus, void *provider_data,
nvdimm->provider_data = provider_data;
nvdimm->flags = flags;
nvdimm->dsm_mask = dsm_mask;
-
+ atomic_set(&nvdimm->busy, 0);
dev = &nvdimm->dev;
dev_set_name(dev, "nmem%d", nvdimm->id);
dev->parent = &nvdimm_bus->dev;
diff --git a/drivers/nvdimm/nd-private.h b/drivers/nvdimm/nd-private.h
index 85536c3556a1..5d5a406e60f8 100644
--- a/drivers/nvdimm/nd-private.h
+++ b/drivers/nvdimm/nd-private.h
@@ -14,6 +14,9 @@
#define __ND_PRIVATE_H__
#include <linux/libnvdimm.h>
#include <linux/device.h>
+#include <linux/libnvdimm.h>
+#include <linux/sizes.h>
+#include <linux/mutex.h>
extern struct list_head nvdimm_bus_list;
extern struct mutex nvdimm_bus_list_mutex;
@@ -21,10 +24,11 @@ extern int nvdimm_major;
struct nvdimm_bus {
struct nvdimm_bus_descriptor *nd_desc;
+ wait_queue_head_t probe_wait;
struct module *module;
struct list_head list;
struct device dev;
- int id;
+ int id, probe_active;
struct mutex reconfig_mutex;
};
@@ -33,6 +37,7 @@ struct nvdimm {
void *provider_data;
unsigned long *dsm_mask;
struct device dev;
+ atomic_t busy;
int id;
};
@@ -42,10 +47,14 @@ bool is_nd_pmem(struct device *dev);
struct nvdimm_bus *walk_to_nvdimm_bus(struct device *nd_dev);
int __init nvdimm_bus_init(void);
void nvdimm_bus_exit(void);
+void nd_region_probe_start(struct nvdimm_bus *nvdimm_bus, struct device *dev);
+void nd_region_probe_end(struct nvdimm_bus *nvdimm_bus, struct device *dev, int rc);
+void nd_region_notify_remove(struct nvdimm_bus *nvdimm_bus, struct device *dev, int rc);
int nvdimm_bus_create_ndctl(struct nvdimm_bus *nvdimm_bus);
void nvdimm_bus_destroy_ndctl(struct nvdimm_bus *nvdimm_bus);
void nd_synchronize(void);
int nvdimm_bus_register_dimms(struct nvdimm_bus *nvdimm_bus);
int nvdimm_bus_register_regions(struct nvdimm_bus *nvdimm_bus);
+int nvdimm_bus_init_interleave_sets(struct nvdimm_bus *nvdimm_bus);
int nd_match_dimm(struct device *dev, void *data);
#endif /* __ND_PRIVATE_H__ */
diff --git a/drivers/nvdimm/nd.h b/drivers/nvdimm/nd.h
index 9d0c03e0d71e..6bc0a233b6bd 100644
--- a/drivers/nvdimm/nd.h
+++ b/drivers/nvdimm/nd.h
@@ -35,6 +35,7 @@ struct nd_region {
u64 ndr_start;
int id;
void *provider_data;
+ struct nd_interleave_set *nd_set;
struct nd_mapping mapping[0];
};
diff --git a/drivers/nvdimm/region_devs.c b/drivers/nvdimm/region_devs.c
index 497177d91257..c99546ee10ab 100644
--- a/drivers/nvdimm/region_devs.c
+++ b/drivers/nvdimm/region_devs.c
@@ -10,7 +10,10 @@
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*/
+#include <linux/scatterlist.h>
+#include <linux/sched.h>
#include <linux/slab.h>
+#include <linux/sort.h>
#include <linux/io.h>
#include "nd-private.h"
#include "nd.h"
@@ -133,6 +136,21 @@ static ssize_t nstype_show(struct device *dev,
}
static DEVICE_ATTR_RO(nstype);
+static ssize_t set_cookie_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct nd_region *nd_region = to_nd_region(dev);
+ struct nd_interleave_set *nd_set = nd_region->nd_set;
+
+ if (is_nd_pmem(dev) && nd_set)
+ /* pass, should be precluded by nd_region_visible */;
+ else
+ return -ENXIO;
+
+ return sprintf(buf, "%#llx\n", nd_set->cookie);
+}
+static DEVICE_ATTR_RO(set_cookie);
+
static ssize_t init_namespaces_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
@@ -154,15 +172,81 @@ static struct attribute *nd_region_attributes[] = {
&dev_attr_size.attr,
&dev_attr_nstype.attr,
&dev_attr_mappings.attr,
+ &dev_attr_set_cookie.attr,
&dev_attr_init_namespaces.attr,
NULL,
};
+static umode_t nd_region_visible(struct kobject *kobj, struct attribute *a, int n)
+{
+ struct device *dev = container_of(kobj, typeof(*dev), kobj);
+ struct nd_region *nd_region = to_nd_region(dev);
+ struct nd_interleave_set *nd_set = nd_region->nd_set;
+
+ if (a != &dev_attr_set_cookie.attr)
+ return a->mode;
+
+ if (is_nd_pmem(dev) && nd_set)
+ return a->mode;
+
+ return 0;
+}
+
struct attribute_group nd_region_attribute_group = {
.attrs = nd_region_attributes,
+ .is_visible = nd_region_visible,
};
EXPORT_SYMBOL_GPL(nd_region_attribute_group);
+/*
+ * Upon successful probe/remove, take/release a reference on the
+ * associated interleave set (if present)
+ */
+static void nd_region_notify_driver_action(struct nvdimm_bus *nvdimm_bus,
+ struct device *dev, int rc, bool probe)
+{
+ if (rc)
+ return;
+
+ if (is_nd_pmem(dev) || is_nd_blk(dev)) {
+ struct nd_region *nd_region = to_nd_region(dev);
+ int i;
+
+ for (i = 0; i < nd_region->ndr_mappings; i++) {
+ struct nd_mapping *nd_mapping = &nd_region->mapping[i];
+ struct nvdimm *nvdimm = nd_mapping->nvdimm;
+
+ if (probe)
+ atomic_inc(&nvdimm->busy);
+ else
+ atomic_dec(&nvdimm->busy);
+ }
+ }
+}
+
+void nd_region_probe_start(struct nvdimm_bus *nvdimm_bus, struct device *dev)
+{
+ nvdimm_bus_lock(&nvdimm_bus->dev);
+ nvdimm_bus->probe_active++;
+ nvdimm_bus_unlock(&nvdimm_bus->dev);
+}
+
+void nd_region_probe_end(struct nvdimm_bus *nvdimm_bus, struct device *dev, int rc)
+{
+ nvdimm_bus_lock(&nvdimm_bus->dev);
+ nd_region_notify_driver_action(nvdimm_bus, dev, rc, true);
+ if (--nvdimm_bus->probe_active == 0)
+ wake_up(&nvdimm_bus->probe_wait);
+ nvdimm_bus_unlock(&nvdimm_bus->dev);
+}
+
+void nd_region_notify_remove(struct nvdimm_bus *nvdimm_bus, struct device *dev, int rc)
+{
+ nvdimm_bus_lock(dev);
+ nd_region_notify_driver_action(nvdimm_bus, dev, rc, false);
+ nvdimm_bus_unlock(dev);
+}
+
static ssize_t mappingN(struct device *dev, char *buf, int n)
{
struct nd_region *nd_region = to_nd_region(dev);
@@ -322,6 +406,7 @@ static noinline struct nd_region *nd_region_create(struct nvdimm_bus *nvdimm_bus
}
nd_region->ndr_mappings = ndr_desc->num_mappings;
nd_region->provider_data = ndr_desc->provider_data;
+ nd_region->nd_set = ndr_desc->nd_set;
dev = &nd_region->dev;
dev_set_name(dev, "region%d", nd_region->id);
dev->parent = &nvdimm_bus->dev;
diff --git a/include/linux/libnvdimm.h b/include/linux/libnvdimm.h
index 883466f730c8..0f3a6c6c1b73 100644
--- a/include/linux/libnvdimm.h
+++ b/include/linux/libnvdimm.h
@@ -61,11 +61,16 @@ struct nd_cmd_desc {
int out_sizes[ND_CMD_MAX_ELEM];
};
+struct nd_interleave_set {
+ u64 cookie;
+};
+
struct nd_region_desc {
struct resource *res;
struct nd_mapping *nd_mapping;
u16 num_mappings;
const struct attribute_group **attr_groups;
+ struct nd_interleave_set *nd_set;
void *provider_data;
};
@@ -101,4 +106,5 @@ struct nd_region *nvdimm_blk_region_create(struct nvdimm_bus *nvdimm_bus,
struct nd_region_desc *ndr_desc);
struct nd_region *nvdimm_volatile_region_create(struct nvdimm_bus *nvdimm_bus,
struct nd_region_desc *ndr_desc);
+u64 nd_fletcher64(void *addr, size_t len, bool le);
#endif /* __LIBNVDIMM_H__ */
^ permalink raw reply related [flat|nested] 47+ messages in thread
* [PATCH v5 12/21] libnvdimm: namespace indices: read and validate
2015-06-02 0:14 [PATCH v5 00/21] libnvdimm: non-volatile memory devices Dan Williams
` (10 preceding siblings ...)
2015-06-02 0:15 ` [PATCH v5 11/21] libnvdimm, nfit: add interleave-set state-tracking infrastructure Dan Williams
@ 2015-06-02 0:15 ` Dan Williams
2015-06-09 6:39 ` Christoph Hellwig
2015-06-02 0:15 ` [PATCH v5 13/21] libnvdimm: pmem label sets and namespace instantiation Dan Williams
` (8 subsequent siblings)
20 siblings, 1 reply; 47+ messages in thread
From: Dan Williams @ 2015-06-02 0:15 UTC (permalink / raw)
To: linux-nvdimm
Cc: axboe, sfr, rafael, neilb, gregkh, linux-kernel, mingo,
linux-acpi, jmoyer, linux-api, akpm, hch
This on media label format [1] consists of two index blocks followed by
an array of labels. None of these structures are ever updated in place.
A sequence number tracks the current active index and the next one to
write, while labels are written to free slots.
+------------+
| |
| nsindex0 |
| |
+------------+
| |
| nsindex1 |
| |
+------------+
| label0 |
+------------+
| label1 |
+------------+
| |
....nslot...
| |
+------------+
| labelN |
+------------+
After reading valid labels, store the dpa ranges they claim into
per-dimm resource trees.
[1]: http://pmem.io/documents/NVDIMM_Namespace_Spec.pdf
Cc: Neil Brown <neilb@suse.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
drivers/nvdimm/Makefile | 1
drivers/nvdimm/dimm.c | 23 +++
drivers/nvdimm/dimm_devs.c | 30 ++++-
drivers/nvdimm/label.c | 290 ++++++++++++++++++++++++++++++++++++++++++++
drivers/nvdimm/label.h | 129 ++++++++++++++++++++
drivers/nvdimm/nd.h | 49 +++++++
include/uapi/linux/ndctl.h | 1
7 files changed, 521 insertions(+), 2 deletions(-)
create mode 100644 drivers/nvdimm/label.c
create mode 100644 drivers/nvdimm/label.h
diff --git a/drivers/nvdimm/Makefile b/drivers/nvdimm/Makefile
index 4d2a27f52faa..abce98f87f16 100644
--- a/drivers/nvdimm/Makefile
+++ b/drivers/nvdimm/Makefile
@@ -10,3 +10,4 @@ libnvdimm-y += dimm.o
libnvdimm-y += region_devs.o
libnvdimm-y += region.o
libnvdimm-y += namespace_devs.o
+libnvdimm-y += label.o
diff --git a/drivers/nvdimm/dimm.c b/drivers/nvdimm/dimm.c
index eb20fc2df32b..2df97c3c3b34 100644
--- a/drivers/nvdimm/dimm.c
+++ b/drivers/nvdimm/dimm.c
@@ -18,6 +18,7 @@
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/nd.h>
+#include "label.h"
#include "nd.h"
static void free_data(struct nvdimm_drvdata *ndd)
@@ -42,6 +43,11 @@ static int nvdimm_probe(struct device *dev)
return -ENOMEM;
dev_set_drvdata(dev, ndd);
+ ndd->dpa.name = dev_name(dev);
+ ndd->ns_current = -1;
+ ndd->ns_next = -1;
+ ndd->dpa.start = 0;
+ ndd->dpa.end = -1;
ndd->dev = dev;
rc = nvdimm_init_nsarea(ndd);
@@ -54,6 +60,17 @@ static int nvdimm_probe(struct device *dev)
dev_dbg(dev, "config data size: %d\n", ndd->nsarea.config_size);
+ nvdimm_bus_lock(dev);
+ ndd->ns_current = nd_label_validate(ndd);
+ ndd->ns_next = nd_label_next_nsindex(ndd->ns_current);
+ nd_label_copy(ndd, to_next_namespace_index(ndd),
+ to_current_namespace_index(ndd));
+ rc = nd_label_reserve_dpa(ndd);
+ nvdimm_bus_unlock(dev);
+
+ if (rc)
+ goto err;
+
return 0;
err:
@@ -64,7 +81,13 @@ static int nvdimm_probe(struct device *dev)
static int nvdimm_remove(struct device *dev)
{
struct nvdimm_drvdata *ndd = dev_get_drvdata(dev);
+ struct resource *res, *_r;
+ nvdimm_bus_lock(dev);
+ dev_set_drvdata(dev, NULL);
+ for_each_dpa_resource_safe(ndd, res, _r)
+ nvdimm_free_dpa(ndd, res);
+ nvdimm_bus_unlock(dev);
free_data(ndd);
return 0;
diff --git a/drivers/nvdimm/dimm_devs.c b/drivers/nvdimm/dimm_devs.c
index 55405d70f56a..5e40188a7fec 100644
--- a/drivers/nvdimm/dimm_devs.c
+++ b/drivers/nvdimm/dimm_devs.c
@@ -92,8 +92,12 @@ int nvdimm_init_config_data(struct nvdimm_drvdata *ndd)
if (ndd->data)
return 0;
- if (ndd->nsarea.status || ndd->nsarea.max_xfer == 0)
+ if (ndd->nsarea.status || ndd->nsarea.max_xfer == 0
+ || ndd->nsarea.config_size < ND_LABEL_MIN_SIZE) {
+ dev_dbg(ndd->dev, "failed to init config data area: (%d:%d)\n",
+ ndd->nsarea.max_xfer, ndd->nsarea.config_size);
return -ENXIO;
+ }
ndd->data = kmalloc(ndd->nsarea.config_size, GFP_KERNEL);
if (!ndd->data)
@@ -243,6 +247,30 @@ struct nvdimm *nvdimm_create(struct nvdimm_bus *nvdimm_bus, void *provider_data,
}
EXPORT_SYMBOL_GPL(nvdimm_create);
+void nvdimm_free_dpa(struct nvdimm_drvdata *ndd, struct resource *res)
+{
+ WARN_ON_ONCE(!is_nvdimm_bus_locked(ndd->dev));
+ kfree(res->name);
+ __release_region(&ndd->dpa, res->start, resource_size(res));
+}
+
+struct resource *nvdimm_allocate_dpa(struct nvdimm_drvdata *ndd,
+ struct nd_label_id *label_id, resource_size_t start,
+ resource_size_t n)
+{
+ char *name = kmemdup(label_id, sizeof(*label_id), GFP_KERNEL);
+ struct resource *res;
+
+ if (!name)
+ return NULL;
+
+ WARN_ON_ONCE(!is_nvdimm_bus_locked(ndd->dev));
+ res = __request_region(&ndd->dpa, start, n, name, 0);
+ if (!res)
+ kfree(name);
+ return res;
+}
+
static int count_dimms(struct device *dev, void *c)
{
int *count = c;
diff --git a/drivers/nvdimm/label.c b/drivers/nvdimm/label.c
new file mode 100644
index 000000000000..b125bc30e10a
--- /dev/null
+++ b/drivers/nvdimm/label.c
@@ -0,0 +1,290 @@
+/*
+ * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ */
+#include <linux/device.h>
+#include <linux/ndctl.h>
+#include <linux/io.h>
+#include <linux/nd.h>
+#include "nd-private.h"
+#include "label.h"
+#include "nd.h"
+
+#include <asm-generic/io-64-nonatomic-lo-hi.h>
+
+#ifndef __io_virt
+#define __io_virt(x) ((void __force *) (x))
+#endif
+
+static u32 best_seq(u32 a, u32 b)
+{
+ a &= NSINDEX_SEQ_MASK;
+ b &= NSINDEX_SEQ_MASK;
+
+ if (a == 0 || a == b)
+ return b;
+ else if (b == 0)
+ return a;
+ else if (nd_inc_seq(a) == b)
+ return b;
+ else
+ return a;
+}
+
+size_t sizeof_namespace_index(struct nvdimm_drvdata *ndd)
+{
+ u32 index_span;
+
+ if (ndd->nsindex_size)
+ return ndd->nsindex_size;
+
+ /*
+ * The minimum index space is 512 bytes, with that amount of
+ * index we can describe ~1400 labels which is less than a byte
+ * of overhead per label. Round up to a byte of overhead per
+ * label and determine the size of the index region. Yes, this
+ * starts to waste space at larger config_sizes, but it's
+ * unlikely we'll ever see anything but 128K.
+ */
+ index_span = ndd->nsarea.config_size / 129;
+ index_span /= NSINDEX_ALIGN * 2;
+ ndd->nsindex_size = index_span * NSINDEX_ALIGN;
+
+ return ndd->nsindex_size;
+}
+
+int nd_label_validate(struct nvdimm_drvdata *ndd)
+{
+ /*
+ * On media label format consists of two index blocks followed
+ * by an array of labels. None of these structures are ever
+ * updated in place. A sequence number tracks the current
+ * active index and the next one to write, while labels are
+ * written to free slots.
+ *
+ * +------------+
+ * | |
+ * | nsindex0 |
+ * | |
+ * +------------+
+ * | |
+ * | nsindex1 |
+ * | |
+ * +------------+
+ * | label0 |
+ * +------------+
+ * | label1 |
+ * +------------+
+ * | |
+ * ....nslot...
+ * | |
+ * +------------+
+ * | labelN |
+ * +------------+
+ */
+ struct nd_namespace_index __iomem *nsindex[] = {
+ to_namespace_index(ndd, 0),
+ to_namespace_index(ndd, 1),
+ };
+ const int num_index = ARRAY_SIZE(nsindex);
+ struct device *dev = ndd->dev;
+ bool valid[] = { false, false };
+ int i, num_valid = 0;
+ u32 seq;
+
+ for (i = 0; i < num_index; i++) {
+ u64 sum_save, sum;
+ u8 sig[NSINDEX_SIG_LEN];
+
+ memcpy_fromio(sig, nsindex[i]->sig, NSINDEX_SIG_LEN);
+ if (memcmp(sig, NSINDEX_SIGNATURE, NSINDEX_SIG_LEN) != 0) {
+ dev_dbg(dev, "%s: nsindex%d signature invalid\n",
+ __func__, i);
+ continue;
+ }
+ sum_save = readq(&nsindex[i]->checksum);
+ writeq(0, &nsindex[i]->checksum);
+ sum = nd_fletcher64(__io_virt(nsindex[i]),
+ sizeof_namespace_index(ndd), 1);
+ writeq(sum_save, &nsindex[i]->checksum);
+ if (sum != sum_save) {
+ dev_dbg(dev, "%s: nsindex%d checksum invalid\n",
+ __func__, i);
+ continue;
+ }
+ if ((readl(&nsindex[i]->seq) & NSINDEX_SEQ_MASK) == 0) {
+ dev_dbg(dev, "%s: nsindex%d sequence: %#x invalid\n",
+ __func__, i, readl(&nsindex[i]->seq));
+ continue;
+ }
+
+ /* sanity check the index against expected values */
+ if (readq(&nsindex[i]->myoff)
+ != i * sizeof_namespace_index(ndd)) {
+ dev_dbg(dev, "%s: nsindex%d myoff: %#llx invalid\n",
+ __func__, i, (unsigned long long)
+ readq(&nsindex[i]->myoff));
+ continue;
+ }
+ if (readq(&nsindex[i]->otheroff)
+ != (!i) * sizeof_namespace_index(ndd)) {
+ dev_dbg(dev, "%s: nsindex%d otheroff: %#llx invalid\n",
+ __func__, i, (unsigned long long)
+ readq(&nsindex[i]->otheroff));
+ continue;
+ }
+ if (readq(&nsindex[i]->mysize) > sizeof_namespace_index(ndd)
+ || readq(&nsindex[i]->mysize)
+ < sizeof(struct nd_namespace_index)) {
+ dev_dbg(dev, "%s: nsindex%d mysize: %#llx invalid\n",
+ __func__, i, (unsigned long long)
+ readq(&nsindex[i]->mysize));
+ continue;
+ }
+ if (readl(&nsindex[i]->nslot) * sizeof(struct nd_namespace_label)
+ + 2 * sizeof_namespace_index(ndd)
+ > ndd->nsarea.config_size) {
+ dev_dbg(dev, "%s: nsindex%d nslot: %u invalid, config_size: %#x\n",
+ __func__, i, readl(&nsindex[i]->nslot),
+ ndd->nsarea.config_size);
+ continue;
+ }
+ valid[i] = true;
+ num_valid++;
+ }
+
+ switch (num_valid) {
+ case 0:
+ break;
+ case 1:
+ for (i = 0; i < num_index; i++)
+ if (valid[i])
+ return i;
+ /* can't have num_valid > 0 but valid[] = { false, false } */
+ WARN_ON(1);
+ break;
+ default:
+ /* pick the best index... */
+ seq = best_seq(readl(&nsindex[0]->seq), readl(&nsindex[1]->seq));
+ if (seq == (readl(&nsindex[1]->seq) & NSINDEX_SEQ_MASK))
+ return 1;
+ else
+ return 0;
+ break;
+ }
+
+ return -1;
+}
+
+void nd_label_copy(struct nvdimm_drvdata *ndd,
+ struct nd_namespace_index __iomem *dst,
+ struct nd_namespace_index __iomem *src)
+{
+ if (dst && src)
+ /* pass */;
+ else
+ return;
+
+ memcpy(__io_virt(dst), __io_virt(src), sizeof_namespace_index(ndd));
+}
+
+static struct nd_namespace_label __iomem *nd_label_base(struct nvdimm_drvdata *ndd)
+{
+ void __iomem *base = to_namespace_index(ndd, 0);
+
+ return base + 2 * sizeof_namespace_index(ndd);
+}
+
+#define for_each_clear_bit_le(bit, addr, size) \
+ for ((bit) = find_next_zero_bit_le((addr), (size), 0); \
+ (bit) < (size); \
+ (bit) = find_next_zero_bit_le((addr), (size), (bit) + 1))
+
+/**
+ * preamble_current - common variable initialization for nd_label_* routines
+ * @ndd: dimm container for the relevant label set
+ * @nsindex_out: on return set to the currently active namespace index
+ * @free: on return set to the free label bitmap in the index
+ * @nslot: on return set to the number of slots in the label space
+ */
+static bool preamble_current(struct nvdimm_drvdata *ndd,
+ struct nd_namespace_index __iomem **nsindex_out,
+ unsigned long **free, u32 *nslot)
+{
+ struct nd_namespace_index __iomem *nsindex;
+
+ nsindex = to_current_namespace_index(ndd);
+ if (nsindex == NULL)
+ return false;
+
+ *free = __io_virt(nsindex->free);
+ *nslot = readl(&nsindex->nslot);
+ *nsindex_out = nsindex;
+
+ return true;
+}
+
+static char *nd_label_gen_id(struct nd_label_id *label_id, u8 *uuid, u32 flags)
+{
+ if (!label_id || !uuid)
+ return NULL;
+ snprintf(label_id->id, ND_LABEL_ID_SIZE, "%s-%pUb",
+ flags & NSLABEL_FLAG_LOCAL ? "blk" : "pmem", uuid);
+ return label_id->id;
+}
+
+static bool slot_valid(struct nd_namespace_label __iomem *nd_label, u32 slot)
+{
+ /* check that we are written where we expect to be written */
+ if (slot != readl(&nd_label->slot))
+ return false;
+
+ /* check that DPA allocations are page aligned */
+ if ((readq(&nd_label->dpa) | readq(&nd_label->rawsize)) % SZ_4K)
+ return false;
+
+ return true;
+}
+
+int nd_label_reserve_dpa(struct nvdimm_drvdata *ndd)
+{
+ struct nd_namespace_index __iomem *nsindex;
+ unsigned long *free;
+ u32 nslot, slot;
+
+ if (!preamble_current(ndd, &nsindex, &free, &nslot))
+ return 0; /* no label, nothing to reserve */
+
+ for_each_clear_bit_le(slot, free, nslot) {
+ struct nd_namespace_label __iomem *nd_label;
+ struct nd_region *nd_region = NULL;
+ u8 label_uuid[NSLABEL_UUID_LEN];
+ struct nd_label_id label_id;
+ struct resource *res;
+ u32 flags;
+
+ nd_label = nd_label_base(ndd) + slot;
+
+ if (!slot_valid(nd_label, slot))
+ continue;
+
+ memcpy_fromio(label_uuid, nd_label->uuid, NSLABEL_UUID_LEN);
+ flags = readl(&nd_label->flags);
+ nd_label_gen_id(&label_id, label_uuid, flags);
+ res = nvdimm_allocate_dpa(ndd, &label_id, readq(&nd_label->dpa),
+ readq(&nd_label->rawsize));
+ nd_dbg_dpa(nd_region, ndd, res, "reserve\n");
+ if (!res)
+ return -EBUSY;
+ }
+
+ return 0;
+}
diff --git a/drivers/nvdimm/label.h b/drivers/nvdimm/label.h
new file mode 100644
index 000000000000..979aa757c1b4
--- /dev/null
+++ b/drivers/nvdimm/label.h
@@ -0,0 +1,129 @@
+/*
+ * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ */
+#ifndef __LABEL_H__
+#define __LABEL_H__
+
+#include <linux/ndctl.h>
+#include <linux/sizes.h>
+#include <linux/io.h>
+
+enum {
+ NSINDEX_SIG_LEN = 16,
+ NSINDEX_ALIGN = 256,
+ NSINDEX_SEQ_MASK = 0x3,
+ NSLABEL_UUID_LEN = 16,
+ NSLABEL_NAME_LEN = 64,
+ NSLABEL_FLAG_ROLABEL = 0x1, /* read-only label */
+ NSLABEL_FLAG_LOCAL = 0x2, /* DIMM-local namespace */
+ NSLABEL_FLAG_BTT = 0x4, /* namespace contains a BTT */
+ NSLABEL_FLAG_UPDATING = 0x8, /* label being updated */
+ BTT_ALIGN = 4096, /* all btt structures */
+ BTTINFO_SIG_LEN = 16,
+ BTTINFO_UUID_LEN = 16,
+ BTTINFO_FLAG_ERROR = 0x1, /* error state (read-only) */
+ BTTINFO_MAJOR_VERSION = 1,
+ ND_LABEL_MIN_SIZE = 512 * 129, /* see sizeof_namespace_index() */
+ ND_LABEL_ID_SIZE = 50,
+};
+
+static const char NSINDEX_SIGNATURE[] = "NAMESPACE_INDEX\0";
+
+/**
+ * struct nd_namespace_index - label set superblock
+ * @sig: NAMESPACE_INDEX\0
+ * @flags: placeholder
+ * @seq: sequence number for this index
+ * @myoff: offset of this index in label area
+ * @mysize: size of this index struct
+ * @otheroff: offset of other index
+ * @labeloff: offset of first label slot
+ * @nslot: total number of label slots
+ * @major: label area major version
+ * @minor: label area minor version
+ * @checksum: fletcher64 of all fields
+ * @free[0]: bitmap, nlabel bits
+ *
+ * The size of free[] is rounded up so the total struct size is a
+ * multiple of NSINDEX_ALIGN bytes. Any bits this allocates beyond
+ * nlabel bits must be zero.
+ */
+struct nd_namespace_index {
+ u8 sig[NSINDEX_SIG_LEN];
+ __le32 flags;
+ __le32 seq;
+ __le64 myoff;
+ __le64 mysize;
+ __le64 otheroff;
+ __le64 labeloff;
+ __le32 nslot;
+ __le16 major;
+ __le16 minor;
+ __le64 checksum;
+ u8 free[0];
+};
+
+/**
+ * struct nd_namespace_label - namespace superblock
+ * @uuid: UUID per RFC 4122
+ * @name: optional name (NULL-terminated)
+ * @flags: see NSLABEL_FLAG_*
+ * @nlabel: num labels to describe this ns
+ * @position: labels position in set
+ * @isetcookie: interleave set cookie
+ * @lbasize: LBA size in bytes or 0 for pmem
+ * @dpa: DPA of NVM range on this DIMM
+ * @rawsize: size of namespace
+ * @slot: slot of this label in label area
+ * @unused: must be zero
+ */
+struct nd_namespace_label {
+ u8 uuid[NSLABEL_UUID_LEN];
+ u8 name[NSLABEL_NAME_LEN];
+ __le32 flags;
+ __le16 nlabel;
+ __le16 position;
+ __le64 isetcookie;
+ __le64 lbasize;
+ __le64 dpa;
+ __le64 rawsize;
+ __le32 slot;
+ __le32 unused;
+};
+
+/**
+ * struct nd_label_id - identifier string for dpa allocation
+ * @id: "{blk|pmem}-<namespace uuid>"
+ */
+struct nd_label_id {
+ char id[ND_LABEL_ID_SIZE];
+};
+
+/*
+ * If the 'best' index is invalid, so is the 'next' index. Otherwise,
+ * the next index is MOD(index+1, 2)
+ */
+static inline int nd_label_next_nsindex(int index)
+{
+ if (index < 0)
+ return -1;
+
+ return (index + 1) % 2;
+}
+
+struct nvdimm_drvdata;
+int nd_label_validate(struct nvdimm_drvdata *ndd);
+void nd_label_copy(struct nvdimm_drvdata *ndd,
+ struct nd_namespace_index __iomem *dst,
+ struct nd_namespace_index __iomem *src);
+size_t sizeof_namespace_index(struct nvdimm_drvdata *ndd);
+#endif /* __LABEL_H__ */
diff --git a/drivers/nvdimm/nd.h b/drivers/nvdimm/nd.h
index 6bc0a233b6bd..668a6481782c 100644
--- a/drivers/nvdimm/nd.h
+++ b/drivers/nvdimm/nd.h
@@ -16,11 +16,15 @@
#include <linux/device.h>
#include <linux/mutex.h>
#include <linux/ndctl.h>
+#include "label.h"
struct nvdimm_drvdata {
struct device *dev;
+ int nsindex_size;
struct nd_cmd_get_config_size nsarea;
void *data;
+ int ns_current, ns_next;
+ struct resource dpa;
};
struct nd_region_namespaces {
@@ -28,6 +32,37 @@ struct nd_region_namespaces {
int active;
};
+static inline struct nd_namespace_index __iomem *to_namespace_index(
+ struct nvdimm_drvdata *ndd, int i)
+{
+ if (i < 0)
+ return NULL;
+
+ return ((void __iomem *) ndd->data + sizeof_namespace_index(ndd) * i);
+}
+
+static inline struct nd_namespace_index __iomem *to_current_namespace_index(
+ struct nvdimm_drvdata *ndd)
+{
+ return to_namespace_index(ndd, ndd->ns_current);
+}
+
+static inline struct nd_namespace_index __iomem *to_next_namespace_index(
+ struct nvdimm_drvdata *ndd)
+{
+ return to_namespace_index(ndd, ndd->ns_next);
+}
+
+#define nd_dbg_dpa(r, d, res, fmt, arg...) \
+ dev_dbg((r) ? &(r)->dev : (d)->dev, "%s: %.13s: %#llx @ %#llx " fmt, \
+ (r) ? dev_name((d)->dev) : "", res ? res->name : "null", \
+ (unsigned long long) (res ? resource_size(res) : 0), \
+ (unsigned long long) (res ? res->start : 0), ##arg)
+
+#define for_each_dpa_resource_safe(ndd, res, next) \
+ for (res = (ndd)->dpa.child, next = res ? res->sibling : NULL; \
+ res; res = next, next = next ? next->sibling : NULL)
+
struct nd_region {
struct device dev;
u16 ndr_mappings;
@@ -39,6 +74,15 @@ struct nd_region {
struct nd_mapping mapping[0];
};
+/*
+ * Lookup next in the repeating sequence of 01, 10, and 11.
+ */
+static inline unsigned nd_inc_seq(unsigned seq)
+{
+ static const unsigned next[] = { 0, 2, 3, 1 };
+
+ return next[seq & 3];
+}
enum nd_async_mode {
ND_SYNC,
ND_ASYNC,
@@ -58,4 +102,9 @@ int nd_region_register_namespaces(struct nd_region *nd_region, int *err);
void nvdimm_bus_lock(struct device *dev);
void nvdimm_bus_unlock(struct device *dev);
bool is_nvdimm_bus_locked(struct device *dev);
+int nd_label_reserve_dpa(struct nvdimm_drvdata *ndd);
+void nvdimm_free_dpa(struct nvdimm_drvdata *ndd, struct resource *res);
+struct resource *nvdimm_allocate_dpa(struct nvdimm_drvdata *ndd,
+ struct nd_label_id *label_id, resource_size_t start,
+ resource_size_t n);
#endif /* __ND_H__ */
diff --git a/include/uapi/linux/ndctl.h b/include/uapi/linux/ndctl.h
index 6e434a7863b8..74da204c423a 100644
--- a/include/uapi/linux/ndctl.h
+++ b/include/uapi/linux/ndctl.h
@@ -175,7 +175,6 @@ static inline const char *nvdimm_cmd_name(unsigned cmd)
#define ND_IOCTL_ARS_QUERY _IOWR(ND_IOCTL, ND_CMD_ARS_QUERY,\
struct nd_cmd_ars_query)
-
#define ND_DEVICE_DIMM 1 /* nd_dimm: container for "config data" */
#define ND_DEVICE_REGION_PMEM 2 /* nd_region: (parent of pmem namespaces) */
#define ND_DEVICE_REGION_BLK 3 /* nd_region: (parent of blk namespaces) */
^ permalink raw reply related [flat|nested] 47+ messages in thread
* [PATCH v5 13/21] libnvdimm: pmem label sets and namespace instantiation.
2015-06-02 0:14 [PATCH v5 00/21] libnvdimm: non-volatile memory devices Dan Williams
` (11 preceding siblings ...)
2015-06-02 0:15 ` [PATCH v5 12/21] libnvdimm: namespace indices: read and validate Dan Williams
@ 2015-06-02 0:15 ` Dan Williams
2015-06-02 0:15 ` [PATCH v5 14/21] libnvdimm: blk labels " Dan Williams
` (7 subsequent siblings)
20 siblings, 0 replies; 47+ messages in thread
From: Dan Williams @ 2015-06-02 0:15 UTC (permalink / raw)
To: linux-nvdimm
Cc: axboe, sfr, rafael, neilb, gregkh, linux-kernel, mingo,
linux-acpi, jmoyer, linux-api, akpm, hch
A complete label set is a PMEM-label per-dimm per-interleave-set where
all the UUIDs match and the interleave set cookie matches the hosting
interleave set.
Present sysfs attributes for manipulation of a PMEM-namespace's
'alt_name', 'uuid', and 'size' attributes. A later patch will make
these settings persistent by writing back the label.
Note that PMEM allocations grow forwards from the start of an interleave
set (lowest dimm-physical-address (DPA)). BLK-namespaces that alias
with a PMEM interleave set will grow allocations backward from the
highest DPA.
Cc: Greg KH <gregkh@linuxfoundation.org>
Cc: Neil Brown <neilb@suse.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
drivers/nvdimm/bus.c | 6
drivers/nvdimm/core.c | 64 ++
drivers/nvdimm/dimm_devs.c | 103 ++++
drivers/nvdimm/label.c | 54 ++
drivers/nvdimm/label.h | 3
drivers/nvdimm/namespace_devs.c | 1024 +++++++++++++++++++++++++++++++++++++++
drivers/nvdimm/nd-private.h | 11
drivers/nvdimm/nd.h | 32 +
drivers/nvdimm/pmem.c | 20 +
drivers/nvdimm/region.c | 3
drivers/nvdimm/region_devs.c | 145 +++++-
include/linux/libnvdimm.h | 2
include/linux/nd.h | 24 +
include/uapi/linux/ndctl.h | 4
14 files changed, 1484 insertions(+), 11 deletions(-)
diff --git a/drivers/nvdimm/bus.c b/drivers/nvdimm/bus.c
index 54bf593043c7..95c11e622daa 100644
--- a/drivers/nvdimm/bus.c
+++ b/drivers/nvdimm/bus.c
@@ -364,8 +364,10 @@ u32 nd_cmd_out_size(struct nvdimm *nvdimm, int cmd,
}
EXPORT_SYMBOL_GPL(nd_cmd_out_size);
-static void wait_nvdimm_bus_probe_idle(struct nvdimm_bus *nvdimm_bus)
+void wait_nvdimm_bus_probe_idle(struct device *dev)
{
+ struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
+
do {
if (nvdimm_bus->probe_active == 0)
break;
@@ -384,7 +386,7 @@ static int nd_cmd_clear_to_send(struct nvdimm *nvdimm, unsigned int cmd)
return 0;
nvdimm_bus = walk_to_nvdimm_bus(&nvdimm->dev);
- wait_nvdimm_bus_probe_idle(nvdimm_bus);
+ wait_nvdimm_bus_probe_idle(&nvdimm_bus->dev);
if (atomic_read(&nvdimm->busy))
return -EBUSY;
diff --git a/drivers/nvdimm/core.c b/drivers/nvdimm/core.c
index c128b949a500..289b254f52b5 100644
--- a/drivers/nvdimm/core.c
+++ b/drivers/nvdimm/core.c
@@ -14,6 +14,7 @@
#include <linux/export.h>
#include <linux/module.h>
#include <linux/device.h>
+#include <linux/ctype.h>
#include <linux/ndctl.h>
#include <linux/mutex.h>
#include <linux/slab.h>
@@ -107,6 +108,69 @@ struct nvdimm_bus *walk_to_nvdimm_bus(struct device *nd_dev)
return NULL;
}
+static bool is_uuid_sep(char sep)
+{
+ if (sep == '\n' || sep == '-' || sep == ':' || sep == '\0')
+ return true;
+ return false;
+}
+
+static int nd_uuid_parse(struct device *dev, u8 *uuid_out, const char *buf,
+ size_t len)
+{
+ const char *str = buf;
+ u8 uuid[16];
+ int i;
+
+ for (i = 0; i < 16; i++) {
+ if (!isxdigit(str[0]) || !isxdigit(str[1])) {
+ dev_dbg(dev, "%s: pos: %d buf[%zd]: %c buf[%zd]: %c\n",
+ __func__, i, str - buf, str[0],
+ str + 1 - buf, str[1]);
+ return -EINVAL;
+ }
+
+ uuid[i] = (hex_to_bin(str[0]) << 4) | hex_to_bin(str[1]);
+ str += 2;
+ if (is_uuid_sep(*str))
+ str++;
+ }
+
+ memcpy(uuid_out, uuid, sizeof(uuid));
+ return 0;
+}
+
+/**
+ * nd_uuid_store: common implementation for writing 'uuid' sysfs attributes
+ * @dev: container device for the uuid property
+ * @uuid_out: uuid buffer to replace
+ * @buf: raw sysfs buffer to parse
+ *
+ * Enforce that uuids can only be changed while the device is disabled
+ * (driver detached)
+ * LOCKING: expects device_lock() is held on entry
+ */
+int nd_uuid_store(struct device *dev, u8 **uuid_out, const char *buf,
+ size_t len)
+{
+ u8 uuid[16];
+ int rc;
+
+ if (dev->driver)
+ return -EBUSY;
+
+ rc = nd_uuid_parse(dev, uuid, buf, len);
+ if (rc)
+ return rc;
+
+ kfree(*uuid_out);
+ *uuid_out = kmemdup(uuid, sizeof(uuid), GFP_KERNEL);
+ if (!(*uuid_out))
+ return -ENOMEM;
+
+ return 0;
+}
+
static ssize_t commands_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
diff --git a/drivers/nvdimm/dimm_devs.c b/drivers/nvdimm/dimm_devs.c
index 5e40188a7fec..a6ef75433747 100644
--- a/drivers/nvdimm/dimm_devs.c
+++ b/drivers/nvdimm/dimm_devs.c
@@ -159,6 +159,14 @@ struct nvdimm *to_nvdimm(struct device *dev)
}
EXPORT_SYMBOL_GPL(to_nvdimm);
+struct nvdimm_drvdata *to_ndd(struct nd_mapping *nd_mapping)
+{
+ struct nvdimm *nvdimm = nd_mapping->nvdimm;
+
+ return dev_get_drvdata(&nvdimm->dev);
+}
+EXPORT_SYMBOL(to_ndd);
+
const char *nvdimm_name(struct nvdimm *nvdimm)
{
return dev_name(&nvdimm->dev);
@@ -247,6 +255,83 @@ struct nvdimm *nvdimm_create(struct nvdimm_bus *nvdimm_bus, void *provider_data,
}
EXPORT_SYMBOL_GPL(nvdimm_create);
+/**
+ * nd_pmem_available_dpa - for the given dimm+region account unallocated dpa
+ * @nd_mapping: container of dpa-resource-root + labels
+ * @nd_region: constrain available space check to this reference region
+ * @overlap: calculate available space assuming this level of overlap
+ *
+ * Validate that a PMEM label, if present, aligns with the start of an
+ * interleave set and truncate the available size at the lowest BLK
+ * overlap point.
+ *
+ * The expectation is that this routine is called multiple times as it
+ * probes for the largest BLK encroachment for any single member DIMM of
+ * the interleave set. Once that value is determined the PMEM-limit for
+ * the set can be established.
+ */
+resource_size_t nd_pmem_available_dpa(struct nd_region *nd_region,
+ struct nd_mapping *nd_mapping, resource_size_t *overlap)
+{
+ resource_size_t map_end, busy = 0, available, blk_start;
+ struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
+ struct resource *res;
+ const char *reason;
+
+ if (!ndd)
+ return 0;
+
+ map_end = nd_mapping->start + nd_mapping->size - 1;
+ blk_start = max(nd_mapping->start, map_end + 1 - *overlap);
+ for_each_dpa_resource(ndd, res)
+ if (res->start >= nd_mapping->start && res->start < map_end) {
+ if (strncmp(res->name, "blk", 3) == 0)
+ blk_start = min(blk_start, res->start);
+ else if (res->start != nd_mapping->start) {
+ reason = "misaligned to iset";
+ goto err;
+ } else {
+ if (busy) {
+ reason = "duplicate overlapping PMEM reservations?";
+ goto err;
+ }
+ busy += resource_size(res);
+ continue;
+ }
+ } else if (res->end >= nd_mapping->start && res->end <= map_end) {
+ if (strncmp(res->name, "blk", 3) == 0) {
+ /*
+ * If a BLK allocation overlaps the start of
+ * PMEM the entire interleave set may now only
+ * be used for BLK.
+ */
+ blk_start = nd_mapping->start;
+ } else {
+ reason = "misaligned to iset";
+ goto err;
+ }
+ } else if (nd_mapping->start > res->start
+ && nd_mapping->start < res->end) {
+ /* total eclipse of the mapping */
+ busy += nd_mapping->size;
+ blk_start = nd_mapping->start;
+ }
+
+ *overlap = map_end + 1 - blk_start;
+ available = blk_start - nd_mapping->start;
+ if (busy < available)
+ return available - busy;
+ return 0;
+
+ err:
+ /*
+ * Something is wrong, PMEM must align with the start of the
+ * interleave set, and there can only be one allocation per set.
+ */
+ nd_dbg_dpa(nd_region, ndd, res, "%s\n", reason);
+ return 0;
+}
+
void nvdimm_free_dpa(struct nvdimm_drvdata *ndd, struct resource *res)
{
WARN_ON_ONCE(!is_nvdimm_bus_locked(ndd->dev));
@@ -271,6 +356,24 @@ struct resource *nvdimm_allocate_dpa(struct nvdimm_drvdata *ndd,
return res;
}
+/**
+ * nvdimm_allocated_dpa - sum up the dpa currently allocated to this label_id
+ * @nvdimm: container of dpa-resource-root + labels
+ * @label_id: dpa resource name of the form {pmem|blk}-<human readable uuid>
+ */
+resource_size_t nvdimm_allocated_dpa(struct nvdimm_drvdata *ndd,
+ struct nd_label_id *label_id)
+{
+ resource_size_t allocated = 0;
+ struct resource *res;
+
+ for_each_dpa_resource(ndd, res)
+ if (strcmp(res->name, label_id->id) == 0)
+ allocated += resource_size(res);
+
+ return allocated;
+}
+
static int count_dimms(struct device *dev, void *c)
{
int *count = c;
diff --git a/drivers/nvdimm/label.c b/drivers/nvdimm/label.c
index b125bc30e10a..66bafecc2419 100644
--- a/drivers/nvdimm/label.c
+++ b/drivers/nvdimm/label.c
@@ -232,7 +232,7 @@ static bool preamble_current(struct nvdimm_drvdata *ndd,
return true;
}
-static char *nd_label_gen_id(struct nd_label_id *label_id, u8 *uuid, u32 flags)
+char *nd_label_gen_id(struct nd_label_id *label_id, u8 *uuid, u32 flags)
{
if (!label_id || !uuid)
return NULL;
@@ -288,3 +288,55 @@ int nd_label_reserve_dpa(struct nvdimm_drvdata *ndd)
return 0;
}
+
+int nd_label_active_count(struct nvdimm_drvdata *ndd)
+{
+ struct nd_namespace_index __iomem *nsindex;
+ unsigned long *free;
+ u32 nslot, slot;
+ int count = 0;
+
+ if (!preamble_current(ndd, &nsindex, &free, &nslot))
+ return 0;
+
+ for_each_clear_bit_le(slot, free, nslot) {
+ struct nd_namespace_label __iomem *nd_label;
+
+ nd_label = nd_label_base(ndd) + slot;
+
+ if (!slot_valid(nd_label, slot)) {
+ dev_dbg(ndd->dev,
+ "%s: slot%d invalid slot: %d dpa: %lx rawsize: %lx\n",
+ __func__, slot, readl(&nd_label->slot),
+ (unsigned long) readq(&nd_label->dpa),
+ (unsigned long) readq(&nd_label->rawsize));
+ continue;
+ }
+ count++;
+ }
+ return count;
+}
+
+struct nd_namespace_label __iomem *nd_label_active(
+ struct nvdimm_drvdata *ndd, int n)
+{
+ struct nd_namespace_index __iomem *nsindex;
+ unsigned long *free;
+ u32 nslot, slot;
+
+ if (!preamble_current(ndd, &nsindex, &free, &nslot))
+ return NULL;
+
+ for_each_clear_bit_le(slot, free, nslot) {
+ struct nd_namespace_label __iomem *nd_label;
+
+ nd_label = nd_label_base(ndd) + slot;
+ if (!slot_valid(nd_label, slot))
+ continue;
+
+ if (n-- == 0)
+ return nd_label_base(ndd) + slot;
+ }
+
+ return NULL;
+}
diff --git a/drivers/nvdimm/label.h b/drivers/nvdimm/label.h
index 979aa757c1b4..7d4a43d16871 100644
--- a/drivers/nvdimm/label.h
+++ b/drivers/nvdimm/label.h
@@ -126,4 +126,7 @@ void nd_label_copy(struct nvdimm_drvdata *ndd,
struct nd_namespace_index __iomem *dst,
struct nd_namespace_index __iomem *src);
size_t sizeof_namespace_index(struct nvdimm_drvdata *ndd);
+int nd_label_active_count(struct nvdimm_drvdata *ndd);
+struct nd_namespace_label __iomem *nd_label_active(
+ struct nvdimm_drvdata *ndd, int n);
#endif /* __LABEL_H__ */
diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c
index 8fbdf68c64d8..3ff2caab4f0b 100644
--- a/drivers/nvdimm/namespace_devs.c
+++ b/drivers/nvdimm/namespace_devs.c
@@ -14,8 +14,11 @@
#include <linux/device.h>
#include <linux/slab.h>
#include <linux/nd.h>
+#include "nd-private.h"
#include "nd.h"
+#include <asm-generic/io-64-nonatomic-lo-hi.h>
+
static void namespace_io_release(struct device *dev)
{
struct nd_namespace_io *nsio = to_nd_namespace_io(dev);
@@ -23,11 +26,50 @@ static void namespace_io_release(struct device *dev)
kfree(nsio);
}
+static void namespace_pmem_release(struct device *dev)
+{
+ struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
+
+ kfree(nspm->alt_name);
+ kfree(nspm->uuid);
+ kfree(nspm);
+}
+
+static void namespace_blk_release(struct device *dev)
+{
+ /* TODO: blk namespace support */
+}
+
static struct device_type namespace_io_device_type = {
.name = "nd_namespace_io",
.release = namespace_io_release,
};
+static struct device_type namespace_pmem_device_type = {
+ .name = "nd_namespace_pmem",
+ .release = namespace_pmem_release,
+};
+
+static struct device_type namespace_blk_device_type = {
+ .name = "nd_namespace_blk",
+ .release = namespace_blk_release,
+};
+
+static bool is_namespace_pmem(struct device *dev)
+{
+ return dev ? dev->type == &namespace_pmem_device_type : false;
+}
+
+static bool is_namespace_blk(struct device *dev)
+{
+ return dev ? dev->type == &namespace_blk_device_type : false;
+}
+
+static bool is_namespace_io(struct device *dev)
+{
+ return dev ? dev->type == &namespace_io_device_type : false;
+}
+
static ssize_t nstype_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
@@ -37,13 +79,674 @@ static ssize_t nstype_show(struct device *dev,
}
static DEVICE_ATTR_RO(nstype);
+static ssize_t __alt_name_store(struct device *dev, const char *buf,
+ const size_t len)
+{
+ char *input, *pos, *alt_name, **ns_altname;
+ ssize_t rc;
+
+ if (is_namespace_pmem(dev)) {
+ struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
+
+ ns_altname = &nspm->alt_name;
+ } else if (is_namespace_blk(dev)) {
+ /* TODO: blk namespace support */
+ return -ENXIO;
+ } else
+ return -ENXIO;
+
+ if (dev->driver)
+ return -EBUSY;
+
+ input = kmemdup(buf, len + 1, GFP_KERNEL);
+ if (!input)
+ return -ENOMEM;
+
+ input[len] = '\0';
+ pos = strim(input);
+ if (strlen(pos) + 1 > NSLABEL_NAME_LEN) {
+ rc = -EINVAL;
+ goto out;
+ }
+
+ alt_name = kzalloc(NSLABEL_NAME_LEN, GFP_KERNEL);
+ if (!alt_name) {
+ rc = -ENOMEM;
+ goto out;
+ }
+ kfree(*ns_altname);
+ *ns_altname = alt_name;
+ sprintf(*ns_altname, "%s", pos);
+ rc = len;
+
+out:
+ kfree(input);
+ return rc;
+}
+
+static ssize_t alt_name_store(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t len)
+{
+ ssize_t rc;
+
+ device_lock(dev);
+ nvdimm_bus_lock(dev);
+ wait_nvdimm_bus_probe_idle(dev);
+ rc = __alt_name_store(dev, buf, len);
+ dev_dbg(dev, "%s: %s (%zd)\n", __func__, rc < 0 ? "fail" : "success", rc);
+ nvdimm_bus_unlock(dev);
+ device_unlock(dev);
+
+ return rc;
+}
+
+static ssize_t alt_name_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ char *ns_altname;
+
+ if (is_namespace_pmem(dev)) {
+ struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
+
+ ns_altname = nspm->alt_name;
+ } else if (is_namespace_blk(dev)) {
+ /* TODO: blk namespace support */
+ return -ENXIO;
+ } else
+ return -ENXIO;
+
+ return sprintf(buf, "%s\n", ns_altname ? ns_altname : "");
+}
+static DEVICE_ATTR_RW(alt_name);
+
+static int scan_free(struct nd_region *nd_region,
+ struct nd_mapping *nd_mapping, struct nd_label_id *label_id,
+ resource_size_t n)
+{
+ bool is_blk = strncmp(label_id->id, "blk", 3) == 0;
+ struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
+ int rc = 0;
+
+ while (n) {
+ struct resource *res, *last;
+ resource_size_t new_start;
+
+ last = NULL;
+ for_each_dpa_resource(ndd, res)
+ if (strcmp(res->name, label_id->id) == 0)
+ last = res;
+ res = last;
+ if (!res)
+ return 0;
+
+ if (n >= resource_size(res)) {
+ n -= resource_size(res);
+ nd_dbg_dpa(nd_region, ndd, res, "delete %d\n", rc);
+ nvdimm_free_dpa(ndd, res);
+ /* retry with last resource deleted */
+ continue;
+ }
+
+ /*
+ * Keep BLK allocations relegated to high DPA as much as
+ * possible
+ */
+ if (is_blk)
+ new_start = res->start + n;
+ else
+ new_start = res->start;
+
+ rc = adjust_resource(res, new_start, resource_size(res) - n);
+ nd_dbg_dpa(nd_region, ndd, res, "shrink %d\n", rc);
+ break;
+ }
+
+ return rc;
+}
+
+/**
+ * shrink_dpa_allocation - for each dimm in region free n bytes for label_id
+ * @nd_region: the set of dimms to reclaim @n bytes from
+ * @label_id: unique identifier for the namespace consuming this dpa range
+ * @n: number of bytes per-dimm to release
+ *
+ * Assumes resources are ordered. Starting from the end try to
+ * adjust_resource() the allocation to @n, but if @n is larger than the
+ * allocation delete it and find the 'new' last allocation in the label
+ * set.
+ */
+static int shrink_dpa_allocation(struct nd_region *nd_region,
+ struct nd_label_id *label_id, resource_size_t n)
+{
+ int i;
+
+ for (i = 0; i < nd_region->ndr_mappings; i++) {
+ struct nd_mapping *nd_mapping = &nd_region->mapping[i];
+ int rc;
+
+ rc = scan_free(nd_region, nd_mapping, label_id, n);
+ if (rc)
+ return rc;
+ }
+
+ return 0;
+}
+
+static resource_size_t init_dpa_allocation(struct nd_label_id *label_id,
+ struct nd_region *nd_region, struct nd_mapping *nd_mapping,
+ resource_size_t n)
+{
+ bool is_blk = strncmp(label_id->id, "blk", 3) == 0;
+ struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
+ resource_size_t first_dpa;
+ struct resource *res;
+ int rc = 0;
+
+ /* allocate blk from highest dpa first */
+ if (is_blk)
+ first_dpa = nd_mapping->start + nd_mapping->size - n;
+ else
+ first_dpa = nd_mapping->start;
+
+ /* first resource allocation for this label-id or dimm */
+ res = nvdimm_allocate_dpa(ndd, label_id, first_dpa, n);
+ if (!res)
+ rc = -EBUSY;
+
+ nd_dbg_dpa(nd_region, ndd, res, "init %d\n", rc);
+ return rc ? n : 0;
+}
+
+static bool space_valid(bool is_pmem, struct nd_label_id *label_id,
+ struct resource *res)
+{
+ /*
+ * For BLK-space any space is valid, for PMEM-space, it must be
+ * contiguous with an existing allocation.
+ */
+ if (!is_pmem)
+ return true;
+ if (!res || strcmp(res->name, label_id->id) == 0)
+ return true;
+ return false;
+}
+
+enum alloc_loc {
+ ALLOC_ERR = 0, ALLOC_BEFORE, ALLOC_MID, ALLOC_AFTER,
+};
+
+static resource_size_t scan_allocate(struct nd_region *nd_region,
+ struct nd_mapping *nd_mapping, struct nd_label_id *label_id,
+ resource_size_t n)
+{
+ resource_size_t mapping_end = nd_mapping->start + nd_mapping->size - 1;
+ bool is_pmem = strncmp(label_id->id, "pmem", 4) == 0;
+ struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
+ const resource_size_t to_allocate = n;
+ struct resource *res;
+ int first;
+
+ retry:
+ first = 0;
+ for_each_dpa_resource(ndd, res) {
+ resource_size_t allocate, available = 0, free_start, free_end;
+ struct resource *next = res->sibling, *new_res = NULL;
+ enum alloc_loc loc = ALLOC_ERR;
+ const char *action;
+ int rc = 0;
+
+ /* ignore resources outside this nd_mapping */
+ if (res->start > mapping_end)
+ continue;
+ if (res->end < nd_mapping->start)
+ continue;
+
+ /* space at the beginning of the mapping */
+ if (!first++ && res->start > nd_mapping->start) {
+ free_start = nd_mapping->start;
+ available = res->start - free_start;
+ if (space_valid(is_pmem, label_id, NULL))
+ loc = ALLOC_BEFORE;
+ }
+
+ /* space between allocations */
+ if (!loc && next) {
+ free_start = res->start + resource_size(res);
+ free_end = min(mapping_end, next->start - 1);
+ if (space_valid(is_pmem, label_id, res)
+ && free_start < free_end) {
+ available = free_end + 1 - free_start;
+ loc = ALLOC_MID;
+ }
+ }
+
+ /* space at the end of the mapping */
+ if (!loc && !next) {
+ free_start = res->start + resource_size(res);
+ free_end = mapping_end;
+ if (space_valid(is_pmem, label_id, res)
+ && free_start < free_end) {
+ available = free_end + 1 - free_start;
+ loc = ALLOC_AFTER;
+ }
+ }
+
+ if (!loc || !available)
+ continue;
+ allocate = min(available, n);
+ switch (loc) {
+ case ALLOC_BEFORE:
+ if (strcmp(res->name, label_id->id) == 0) {
+ /* adjust current resource up */
+ if (is_pmem)
+ return n;
+ rc = adjust_resource(res, res->start - allocate,
+ resource_size(res) + allocate);
+ action = "cur grow up";
+ } else
+ action = "allocate";
+ break;
+ case ALLOC_MID:
+ if (strcmp(next->name, label_id->id) == 0) {
+ /* adjust next resource up */
+ if (is_pmem)
+ return n;
+ rc = adjust_resource(next, next->start
+ - allocate, resource_size(next)
+ + allocate);
+ new_res = next;
+ action = "next grow up";
+ } else if (strcmp(res->name, label_id->id) == 0) {
+ action = "grow down";
+ } else
+ action = "allocate";
+ break;
+ case ALLOC_AFTER:
+ if (strcmp(res->name, label_id->id) == 0)
+ action = "grow down";
+ else
+ action = "allocate";
+ break;
+ default:
+ return n;
+ }
+
+ if (strcmp(action, "allocate") == 0) {
+ /* BLK allocate bottom up */
+ if (!is_pmem)
+ free_start += available - allocate;
+ else if (free_start != nd_mapping->start)
+ return n;
+
+ new_res = nvdimm_allocate_dpa(ndd, label_id,
+ free_start, allocate);
+ if (!new_res)
+ rc = -EBUSY;
+ } else if (strcmp(action, "grow down") == 0) {
+ /* adjust current resource down */
+ rc = adjust_resource(res, res->start, resource_size(res)
+ + allocate);
+ }
+
+ if (!new_res)
+ new_res = res;
+
+ nd_dbg_dpa(nd_region, ndd, new_res, "%s(%d) %d\n",
+ action, loc, rc);
+
+ if (rc)
+ return n;
+
+ n -= allocate;
+ if (n) {
+ /*
+ * Retry scan with newly inserted resources.
+ * For example, if we did an ALLOC_BEFORE
+ * insertion there may also have been space
+ * available for an ALLOC_AFTER insertion, so we
+ * need to check this same resource again
+ */
+ goto retry;
+ } else
+ return 0;
+ }
+
+ if (is_pmem && n == to_allocate)
+ return init_dpa_allocation(label_id, nd_region, nd_mapping, n);
+ return n;
+}
+
+/**
+ * grow_dpa_allocation - for each dimm allocate n bytes for @label_id
+ * @nd_region: the set of dimms to allocate @n more bytes from
+ * @label_id: unique identifier for the namespace consuming this dpa range
+ * @n: number of bytes per-dimm to add to the existing allocation
+ *
+ * Assumes resources are ordered. For BLK regions, first consume
+ * BLK-only available DPA free space, then consume PMEM-aliased DPA
+ * space starting at the highest DPA. For PMEM regions start
+ * allocations from the start of an interleave set and end at the first
+ * BLK allocation or the end of the interleave set, whichever comes
+ * first.
+ */
+static int grow_dpa_allocation(struct nd_region *nd_region,
+ struct nd_label_id *label_id, resource_size_t n)
+{
+ int i;
+
+ for (i = 0; i < nd_region->ndr_mappings; i++) {
+ struct nd_mapping *nd_mapping = &nd_region->mapping[i];
+ int rc;
+
+ rc = scan_allocate(nd_region, nd_mapping, label_id, n);
+ if (rc)
+ return rc;
+ }
+
+ return 0;
+}
+
+static void nd_namespace_pmem_set_size(struct nd_region *nd_region,
+ struct nd_namespace_pmem *nspm, resource_size_t size)
+{
+ struct resource *res = &nspm->nsio.res;
+
+ res->start = nd_region->ndr_start;
+ res->end = nd_region->ndr_start + size - 1;
+}
+
+static ssize_t __size_store(struct device *dev, unsigned long long val)
+{
+ resource_size_t allocated = 0, available = 0;
+ struct nd_region *nd_region = to_nd_region(dev->parent);
+ struct nd_mapping *nd_mapping;
+ struct nvdimm_drvdata *ndd;
+ struct nd_label_id label_id;
+ u32 flags = 0, remainder;
+ u8 *uuid = NULL;
+ int rc, i;
+
+ if (dev->driver)
+ return -EBUSY;
+
+ if (is_namespace_pmem(dev)) {
+ struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
+
+ uuid = nspm->uuid;
+ } else if (is_namespace_blk(dev)) {
+ /* TODO: blk namespace support */
+ return -ENXIO;
+ }
+
+ /*
+ * We need a uuid for the allocation-label and dimm(s) on which
+ * to store the label.
+ */
+ if (!uuid || nd_region->ndr_mappings == 0)
+ return -ENXIO;
+
+ div_u64_rem(val, SZ_4K * nd_region->ndr_mappings, &remainder);
+ if (remainder) {
+ dev_dbg(dev, "%llu is not %dK aligned\n", val,
+ (SZ_4K * nd_region->ndr_mappings) / SZ_1K);
+ return -EINVAL;
+ }
+
+ nd_label_gen_id(&label_id, uuid, flags);
+ for (i = 0; i < nd_region->ndr_mappings; i++) {
+ nd_mapping = &nd_region->mapping[i];
+ ndd = to_ndd(nd_mapping);
+
+ /*
+ * All dimms in an interleave set, or the base dimm for a blk
+ * region, need to be enabled for the size to be changed.
+ */
+ if (!ndd)
+ return -ENXIO;
+
+ allocated += nvdimm_allocated_dpa(ndd, &label_id);
+ }
+ available = nd_region_available_dpa(nd_region);
+
+ if (val > available + allocated)
+ return -ENOSPC;
+
+ if (val == allocated)
+ return 0;
+
+ val = div_u64(val, nd_region->ndr_mappings);
+ allocated = div_u64(allocated, nd_region->ndr_mappings);
+ if (val < allocated)
+ rc = shrink_dpa_allocation(nd_region, &label_id, allocated - val);
+ else
+ rc = grow_dpa_allocation(nd_region, &label_id, val - allocated);
+
+ if (rc)
+ return rc;
+
+ if (is_namespace_pmem(dev)) {
+ struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
+
+ nd_namespace_pmem_set_size(nd_region, nspm,
+ val * nd_region->ndr_mappings);
+ }
+
+ return rc;
+}
+
+static ssize_t size_store(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t len)
+{
+ unsigned long long val;
+ u8 **uuid = NULL;
+ int rc;
+
+ rc = kstrtoull(buf, 0, &val);
+ if (rc)
+ return rc;
+
+ device_lock(dev);
+ nvdimm_bus_lock(dev);
+ wait_nvdimm_bus_probe_idle(dev);
+ rc = __size_store(dev, val);
+
+ if (is_namespace_pmem(dev)) {
+ struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
+
+ uuid = &nspm->uuid;
+ } else if (is_namespace_blk(dev)) {
+ /* TODO: blk namespace support */
+ rc = -ENXIO;
+ }
+
+ if (rc == 0 && val == 0 && uuid) {
+ /* setting size zero == 'delete namespace' */
+ kfree(*uuid);
+ *uuid = NULL;
+ }
+
+ dev_dbg(dev, "%s: %llx %s (%d)\n", __func__, val, rc < 0
+ ? "fail" : "success", rc);
+
+ nvdimm_bus_unlock(dev);
+ device_unlock(dev);
+
+ return rc ? rc : len;
+}
+
+static ssize_t size_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ if (is_namespace_pmem(dev)) {
+ struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
+
+ return sprintf(buf, "%llu\n", (unsigned long long)
+ resource_size(&nspm->nsio.res));
+ } else if (is_namespace_blk(dev)) {
+ /* TODO: blk namespace support */
+ return -ENXIO;
+ } else if (is_namespace_io(dev)) {
+ struct nd_namespace_io *nsio = to_nd_namespace_io(dev);
+
+ return sprintf(buf, "%llu\n", (unsigned long long)
+ resource_size(&nsio->res));
+ } else
+ return -ENXIO;
+}
+static DEVICE_ATTR(size, S_IRUGO, size_show, size_store);
+
+static ssize_t uuid_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ u8 *uuid;
+
+ if (is_namespace_pmem(dev)) {
+ struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
+
+ uuid = nspm->uuid;
+ } else if (is_namespace_blk(dev)) {
+ /* TODO: blk namespace support */
+ return -ENXIO;
+ } else
+ return -ENXIO;
+
+ if (uuid)
+ return sprintf(buf, "%pUb\n", uuid);
+ return sprintf(buf, "\n");
+}
+
+/**
+ * namespace_update_uuid - check for a unique uuid and whether we're "renaming"
+ * @nd_region: parent region so we can updates all dimms in the set
+ * @dev: namespace type for generating label_id
+ * @new_uuid: incoming uuid
+ * @old_uuid: reference to the uuid storage location in the namespace object
+ */
+static int namespace_update_uuid(struct nd_region *nd_region,
+ struct device *dev, u8 *new_uuid, u8 **old_uuid)
+{
+ u32 flags = is_namespace_blk(dev) ? NSLABEL_FLAG_LOCAL : 0;
+ struct nd_label_id old_label_id;
+ struct nd_label_id new_label_id;
+ int i, rc;
+
+ rc = nd_is_uuid_unique(dev, new_uuid) ? 0 : -EINVAL;
+ if (rc) {
+ kfree(new_uuid);
+ return rc;
+ }
+
+ if (*old_uuid == NULL)
+ goto out;
+
+ nd_label_gen_id(&old_label_id, *old_uuid, flags);
+ nd_label_gen_id(&new_label_id, new_uuid, flags);
+ for (i = 0; i < nd_region->ndr_mappings; i++) {
+ struct nd_mapping *nd_mapping = &nd_region->mapping[i];
+ struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
+ struct resource *res;
+
+ for_each_dpa_resource(ndd, res)
+ if (strcmp(res->name, old_label_id.id) == 0)
+ sprintf((void *) res->name, "%s",
+ new_label_id.id);
+ }
+ kfree(*old_uuid);
+ out:
+ *old_uuid = new_uuid;
+ return 0;
+}
+
+static ssize_t uuid_store(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t len)
+{
+ struct nd_region *nd_region = to_nd_region(dev->parent);
+ u8 *uuid = NULL;
+ u8 **ns_uuid;
+ ssize_t rc;
+
+ if (is_namespace_pmem(dev)) {
+ struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
+
+ ns_uuid = &nspm->uuid;
+ } else if (is_namespace_blk(dev)) {
+ /* TODO: blk namespace support */
+ return -ENXIO;
+ } else
+ return -ENXIO;
+
+ device_lock(dev);
+ nvdimm_bus_lock(dev);
+ wait_nvdimm_bus_probe_idle(dev);
+ rc = nd_uuid_store(dev, &uuid, buf, len);
+ if (rc >= 0)
+ rc = namespace_update_uuid(nd_region, dev, uuid, ns_uuid);
+ dev_dbg(dev, "%s: result: %zd wrote: %s%s", __func__,
+ rc, buf, buf[len - 1] == '\n' ? "" : "\n");
+ nvdimm_bus_unlock(dev);
+ device_unlock(dev);
+
+ return rc ? rc : len;
+}
+static DEVICE_ATTR_RW(uuid);
+
+static ssize_t resource_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct resource *res;
+
+ if (is_namespace_pmem(dev)) {
+ struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
+
+ res = &nspm->nsio.res;
+ } else if (is_namespace_io(dev)) {
+ struct nd_namespace_io *nsio = to_nd_namespace_io(dev);
+
+ res = &nsio->res;
+ } else
+ return -ENXIO;
+
+ /* no address to convey if the namespace has no allocation */
+ if (resource_size(res) == 0)
+ return -ENXIO;
+ return sprintf(buf, "%#llx\n", (unsigned long long) res->start);
+}
+static DEVICE_ATTR_RO(resource);
+
static struct attribute *nd_namespace_attributes[] = {
&dev_attr_nstype.attr,
+ &dev_attr_size.attr,
+ &dev_attr_uuid.attr,
+ &dev_attr_resource.attr,
+ &dev_attr_alt_name.attr,
NULL,
};
+static umode_t nd_namespace_attr_visible(struct kobject *kobj, struct attribute *a, int n)
+{
+ struct device *dev = container_of(kobj, struct device, kobj);
+
+ if (a == &dev_attr_resource.attr) {
+ if (is_namespace_blk(dev))
+ return 0;
+ return a->mode;
+ }
+
+ if (is_namespace_pmem(dev) || is_namespace_blk(dev)) {
+ if (a == &dev_attr_size.attr)
+ return S_IWUSR | S_IRUGO;
+ return a->mode;
+ }
+
+ if (a == &dev_attr_nstype.attr || a == &dev_attr_size.attr)
+ return a->mode;
+
+ return 0;
+}
+
static struct attribute_group nd_namespace_attribute_group = {
.attrs = nd_namespace_attributes,
+ .is_visible = nd_namespace_attr_visible,
};
static const struct attribute_group *nd_namespace_attribute_groups[] = {
@@ -80,23 +783,326 @@ static struct device **create_namespace_io(struct nd_region *nd_region)
return devs;
}
+static bool has_uuid_at_pos(struct nd_region *nd_region, u8 *uuid, u64 cookie, u16 pos)
+{
+ struct nd_namespace_label __iomem *found = NULL;
+ int i;
+
+ for (i = 0; i < nd_region->ndr_mappings; i++) {
+ struct nd_mapping *nd_mapping = &nd_region->mapping[i];
+ struct nd_namespace_label __iomem *nd_label;
+ u8 label_uuid[NSLABEL_UUID_LEN];
+ u8 *found_uuid = NULL;
+ int l;
+
+ for_each_label(l, nd_label, nd_mapping->labels) {
+ u64 isetcookie = readq(&nd_label->isetcookie);
+ u16 position = readw(&nd_label->position);
+ u16 nlabel = readw(&nd_label->nlabel);
+
+ if (isetcookie != cookie)
+ continue;
+
+ memcpy_fromio(label_uuid, nd_label->uuid,
+ NSLABEL_UUID_LEN);
+ if (memcmp(label_uuid, uuid, NSLABEL_UUID_LEN) != 0)
+ continue;
+
+ if (found_uuid) {
+ dev_dbg(to_ndd(nd_mapping)->dev,
+ "%s duplicate entry for uuid\n",
+ __func__);
+ return false;
+ }
+ found_uuid = label_uuid;
+ if (nlabel != nd_region->ndr_mappings)
+ continue;
+ if (position != pos)
+ continue;
+ found = nd_label;
+ break;
+ }
+ if (found)
+ break;
+ }
+ return found != NULL;
+}
+
+static int select_pmem_uuid(struct nd_region *nd_region, u8 *pmem_uuid)
+{
+ struct nd_namespace_label __iomem *select = NULL;
+ int i;
+
+ if (!pmem_uuid)
+ return -ENODEV;
+
+ for (i = 0; i < nd_region->ndr_mappings; i++) {
+ struct nd_mapping *nd_mapping = &nd_region->mapping[i];
+ struct nd_namespace_label __iomem *nd_label;
+ u64 hw_start, hw_end, pmem_start, pmem_end;
+ int l;
+
+ for_each_label(l, nd_label, nd_mapping->labels) {
+ u8 label_uuid[NSLABEL_UUID_LEN];
+
+ memcpy_fromio(label_uuid, nd_label->uuid,
+ NSLABEL_UUID_LEN);
+ if (memcmp(label_uuid, pmem_uuid, NSLABEL_UUID_LEN) == 0)
+ break;
+ }
+
+ if (!nd_label) {
+ WARN_ON(1);
+ return -EINVAL;
+ }
+
+ select = nd_label;
+ /*
+ * Check that this label is compliant with the dpa
+ * range published in NFIT
+ */
+ hw_start = nd_mapping->start;
+ hw_end = hw_start + nd_mapping->size;
+ pmem_start = readq(&select->dpa);
+ pmem_end = pmem_start + readq(&select->rawsize);
+ if (pmem_start == hw_start && pmem_end <= hw_end)
+ /* pass */;
+ else
+ return -EINVAL;
+
+ nd_set_label(nd_mapping->labels, select, 0);
+ nd_set_label(nd_mapping->labels, (void __iomem *) NULL, 1);
+ }
+ return 0;
+}
+
+/**
+ * find_pmem_label_set - validate interleave set labelling, retrieve label0
+ * @nd_region: region with mappings to validate
+ */
+static int find_pmem_label_set(struct nd_region *nd_region,
+ struct nd_namespace_pmem *nspm)
+{
+ u64 cookie = nd_region_interleave_set_cookie(nd_region);
+ struct nd_namespace_label __iomem *nd_label;
+ u8 select_uuid[NSLABEL_UUID_LEN];
+ resource_size_t size = 0;
+ u8 *pmem_uuid = NULL;
+ int rc = -ENODEV, l;
+ u16 i;
+
+ if (cookie == 0)
+ return -ENXIO;
+
+ /*
+ * Find a complete set of labels by uuid. By definition we can start
+ * with any mapping as the reference label
+ */
+ for_each_label(l, nd_label, nd_region->mapping[0].labels) {
+ u64 isetcookie = readq(&nd_label->isetcookie);
+ u8 label_uuid[NSLABEL_UUID_LEN];
+
+ if (isetcookie != cookie)
+ continue;
+
+ memcpy_fromio(label_uuid, nd_label->uuid,
+ NSLABEL_UUID_LEN);
+ for (i = 0; nd_region->ndr_mappings; i++)
+ if (!has_uuid_at_pos(nd_region, label_uuid, cookie, i))
+ break;
+ if (i < nd_region->ndr_mappings) {
+ /*
+ * Give up if we don't find an instance of a
+ * uuid at each position (from 0 to
+ * nd_region->ndr_mappings - 1), or if we find a
+ * dimm with two instances of the same uuid.
+ */
+ rc = -EINVAL;
+ goto err;
+ } else if (pmem_uuid) {
+ /*
+ * If there is more than one valid uuid set, we
+ * need userspace to clean this up.
+ */
+ rc = -EBUSY;
+ goto err;
+ }
+ memcpy(select_uuid, label_uuid, NSLABEL_UUID_LEN);
+ pmem_uuid = select_uuid;
+ }
+
+ /*
+ * Fix up each mapping's 'labels' to have the validated pmem label for
+ * that position at labels[0], and NULL at labels[1]. In the process,
+ * check that the namespace aligns with interleave-set. We know
+ * that it does not overlap with any blk namespaces by virtue of
+ * the dimm being enabled (i.e. nd_label_reserve_dpa()
+ * succeeded).
+ */
+ rc = select_pmem_uuid(nd_region, pmem_uuid);
+ if (rc)
+ goto err;
+
+ /* Calculate total size and populate namespace properties from label0 */
+ for (i = 0; i < nd_region->ndr_mappings; i++) {
+ struct nd_mapping *nd_mapping = &nd_region->mapping[i];
+ struct nd_namespace_label __iomem *label0;
+
+ label0 = nd_get_label(nd_mapping->labels, 0);
+ size += readq(&label0->rawsize);
+ if (readw(&label0->position) != 0)
+ continue;
+ WARN_ON(nspm->alt_name || nspm->uuid);
+ nspm->alt_name = kmemdup((void __force *) label0->name,
+ NSLABEL_NAME_LEN, GFP_KERNEL);
+ nspm->uuid = kmemdup((void __force *) label0->uuid,
+ NSLABEL_UUID_LEN, GFP_KERNEL);
+ }
+
+ if (!nspm->alt_name || !nspm->uuid) {
+ rc = -ENOMEM;
+ goto err;
+ }
+
+ nd_namespace_pmem_set_size(nd_region, nspm, size);
+
+ return 0;
+ err:
+ switch (rc) {
+ case -EINVAL:
+ dev_dbg(&nd_region->dev, "%s: invalid label(s)\n", __func__);
+ break;
+ case -ENODEV:
+ dev_dbg(&nd_region->dev, "%s: label not found\n", __func__);
+ break;
+ default:
+ dev_dbg(&nd_region->dev, "%s: unexpected err: %d\n", __func__, rc);
+ break;
+ }
+ return rc;
+}
+
+static struct device **create_namespace_pmem(struct nd_region *nd_region)
+{
+ struct nd_namespace_pmem *nspm;
+ struct device *dev, **devs;
+ struct resource *res;
+ int rc;
+
+ nspm = kzalloc(sizeof(*nspm), GFP_KERNEL);
+ if (!nspm)
+ return NULL;
+
+ dev = &nspm->nsio.dev;
+ dev->type = &namespace_pmem_device_type;
+ res = &nspm->nsio.res;
+ res->name = dev_name(&nd_region->dev);
+ res->flags = IORESOURCE_MEM;
+ rc = find_pmem_label_set(nd_region, nspm);
+ if (rc == -ENODEV) {
+ int i;
+
+ /* Pass, try to permit namespace creation... */
+ for (i = 0; i < nd_region->ndr_mappings; i++) {
+ struct nd_mapping *nd_mapping = &nd_region->mapping[i];
+
+ kfree(nd_mapping->labels);
+ nd_mapping->labels = NULL;
+ }
+
+ /* Publish a zero-sized namespace for userspace to configure. */
+ nd_namespace_pmem_set_size(nd_region, nspm, 0);
+
+ rc = 0;
+ } else if (rc)
+ goto err;
+
+ devs = kcalloc(2, sizeof(struct device *), GFP_KERNEL);
+ if (!devs)
+ goto err;
+
+ devs[0] = dev;
+ return devs;
+
+ err:
+ namespace_pmem_release(&nspm->nsio.dev);
+ return NULL;
+}
+
+static int init_active_labels(struct nd_region *nd_region)
+{
+ int i;
+
+ for (i = 0; i < nd_region->ndr_mappings; i++) {
+ struct nd_mapping *nd_mapping = &nd_region->mapping[i];
+ struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
+ int count, j;
+
+ /*
+ * If the dimm is disabled then prevent the region from
+ * being activated if it aliases DPA.
+ */
+ if (!ndd) {
+ struct nvdimm *nvdimm = nd_mapping->nvdimm;
+
+ if ((nvdimm->flags & NDD_ALIASING) == 0)
+ return 0;
+ dev_dbg(&nd_region->dev, "%s: is disabled, failing probe\n",
+ dev_name(&nd_mapping->nvdimm->dev));
+ return -ENXIO;
+ }
+
+ count = nd_label_active_count(ndd);
+ dev_dbg(ndd->dev, "%s: %d\n", __func__, count);
+ if (!count)
+ continue;
+ nd_mapping->labels = kcalloc(count + 1,
+ sizeof(struct nd_namespace_label *), GFP_KERNEL);
+ if (!nd_mapping->labels)
+ return -ENOMEM;
+ for (j = 0; j < count; j++) {
+ struct nd_namespace_label __iomem *label;
+
+ label = nd_label_active(ndd, j);
+ nd_set_label(nd_mapping->labels, label, j);
+ }
+ }
+
+ return 0;
+}
+
int nd_region_register_namespaces(struct nd_region *nd_region, int *err)
{
struct device **devs = NULL;
- int i;
+ int i, rc = 0, type;
*err = 0;
- switch (nd_region_to_namespace_type(nd_region)) {
+ nvdimm_bus_lock(&nd_region->dev);
+ rc = init_active_labels(nd_region);
+ if (rc) {
+ nvdimm_bus_unlock(&nd_region->dev);
+ return rc;
+ }
+
+ type = nd_region_to_namespace_type(nd_region);
+ switch (type) {
case ND_DEVICE_NAMESPACE_IO:
devs = create_namespace_io(nd_region);
break;
+ case ND_DEVICE_NAMESPACE_PMEM:
+ devs = create_namespace_pmem(nd_region);
+ break;
default:
break;
}
+ nvdimm_bus_unlock(&nd_region->dev);
- if (!devs)
- return -ENODEV;
+ if (!devs) {
+ rc = -ENODEV;
+ goto err;
+ }
+ nd_region->ns_seed = devs[0];
for (i = 0; devs[i]; i++) {
struct device *dev = devs[i];
@@ -108,4 +1114,14 @@ int nd_region_register_namespaces(struct nd_region *nd_region, int *err)
kfree(devs);
return i;
+
+ err:
+ for (i = 0; i < nd_region->ndr_mappings; i++) {
+ struct nd_mapping *nd_mapping = &nd_region->mapping[i];
+
+ kfree(nd_mapping->labels);
+ nd_mapping->labels = NULL;
+ }
+
+ return rc;
}
diff --git a/drivers/nvdimm/nd-private.h b/drivers/nvdimm/nd-private.h
index 5d5a406e60f8..574174f6461e 100644
--- a/drivers/nvdimm/nd-private.h
+++ b/drivers/nvdimm/nd-private.h
@@ -57,4 +57,15 @@ int nvdimm_bus_register_dimms(struct nvdimm_bus *nvdimm_bus);
int nvdimm_bus_register_regions(struct nvdimm_bus *nvdimm_bus);
int nvdimm_bus_init_interleave_sets(struct nvdimm_bus *nvdimm_bus);
int nd_match_dimm(struct device *dev, void *data);
+struct nd_label_id;
+char *nd_label_gen_id(struct nd_label_id *label_id, u8 *uuid, u32 flags);
+bool nd_is_uuid_unique(struct device *dev, u8 *uuid);
+struct nd_region;
+struct nvdimm_drvdata;
+struct nd_mapping;
+resource_size_t nd_pmem_available_dpa(struct nd_region *nd_region,
+ struct nd_mapping *nd_mapping, resource_size_t *overlap);
+resource_size_t nd_region_available_dpa(struct nd_region *nd_region);
+resource_size_t nvdimm_allocated_dpa(struct nvdimm_drvdata *ndd,
+ struct nd_label_id *label_id);
#endif /* __ND_PRIVATE_H__ */
diff --git a/drivers/nvdimm/nd.h b/drivers/nvdimm/nd.h
index 668a6481782c..2bc087236062 100644
--- a/drivers/nvdimm/nd.h
+++ b/drivers/nvdimm/nd.h
@@ -16,6 +16,7 @@
#include <linux/device.h>
#include <linux/mutex.h>
#include <linux/ndctl.h>
+#include <linux/types.h>
#include "label.h"
struct nvdimm_drvdata {
@@ -59,12 +60,37 @@ static inline struct nd_namespace_index __iomem *to_next_namespace_index(
(unsigned long long) (res ? resource_size(res) : 0), \
(unsigned long long) (res ? res->start : 0), ##arg)
+/* sparse helpers */
+static inline void nd_set_label(struct nd_namespace_label **labels,
+ struct nd_namespace_label __iomem *label, int idx)
+{
+ labels[idx] = (void __force *) label;
+}
+
+static inline struct nd_namespace_label __iomem *nd_get_label(
+ struct nd_namespace_label **labels, int idx)
+{
+ struct nd_namespace_label __iomem *label = NULL;
+
+ if (labels)
+ label = (struct nd_namespace_label __iomem *) labels[idx];
+
+ return label;
+}
+
+#define for_each_label(l, label, labels) \
+ for (l = 0; (label = nd_get_label(labels, l)); l++)
+
+#define for_each_dpa_resource(ndd, res) \
+ for (res = (ndd)->dpa.child; res; res = res->sibling)
+
#define for_each_dpa_resource_safe(ndd, res, next) \
for (res = (ndd)->dpa.child, next = res ? res->sibling : NULL; \
res; res = next, next = next ? next->sibling : NULL)
struct nd_region {
struct device dev;
+ struct device *ns_seed;
u16 ndr_mappings;
u64 ndr_size;
u64 ndr_start;
@@ -88,17 +114,23 @@ enum nd_async_mode {
ND_ASYNC,
};
+void wait_nvdimm_bus_probe_idle(struct device *dev);
void nd_device_register(struct device *dev);
void nd_device_unregister(struct device *dev, enum nd_async_mode mode);
+int nd_uuid_store(struct device *dev, u8 **uuid_out, const char *buf,
+ size_t len);
int __init nvdimm_init(void);
int __init nd_region_init(void);
void nvdimm_exit(void);
void nd_region_exit(void);
+struct nvdimm;
+struct nvdimm_drvdata *to_ndd(struct nd_mapping *nd_mapping);
int nvdimm_init_nsarea(struct nvdimm_drvdata *ndd);
int nvdimm_init_config_data(struct nvdimm_drvdata *ndd);
struct nd_region *to_nd_region(struct device *dev);
int nd_region_to_namespace_type(struct nd_region *nd_region);
int nd_region_register_namespaces(struct nd_region *nd_region, int *err);
+u64 nd_region_interleave_set_cookie(struct nd_region *nd_region);
void nvdimm_bus_lock(struct device *dev);
void nvdimm_bus_unlock(struct device *dev);
bool is_nvdimm_bus_locked(struct device *dev);
diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c
index 0842d27ffc8d..7e7421d9c167 100644
--- a/drivers/nvdimm/pmem.c
+++ b/drivers/nvdimm/pmem.c
@@ -201,6 +201,23 @@ static int nd_pmem_probe(struct device *dev)
struct nd_namespace_io *nsio = to_nd_namespace_io(dev);
struct pmem_device *pmem;
+ if (resource_size(&nsio->res) < ND_MIN_NAMESPACE_SIZE) {
+ resource_size_t size = resource_size(&nsio->res);
+
+ dev_dbg(dev, "%s: size: %pa, too small must be at least %#x\n",
+ __func__, &size, ND_MIN_NAMESPACE_SIZE);
+ return -ENODEV;
+ }
+
+ if (nd_region_to_namespace_type(nd_region) == ND_DEVICE_NAMESPACE_PMEM) {
+ struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
+
+ if (!nspm->uuid) {
+ dev_dbg(dev, "%s: uuid not set\n", __func__);
+ return -ENODEV;
+ }
+ }
+
pmem = pmem_alloc(dev, &nsio->res, nd_region->id);
if (IS_ERR(pmem))
return PTR_ERR(pmem);
@@ -220,13 +237,14 @@ static int nd_pmem_remove(struct device *dev)
MODULE_ALIAS("pmem");
MODULE_ALIAS_ND_DEVICE(ND_DEVICE_NAMESPACE_IO);
+MODULE_ALIAS_ND_DEVICE(ND_DEVICE_NAMESPACE_PMEM);
static struct nd_device_driver nd_pmem_driver = {
.probe = nd_pmem_probe,
.remove = nd_pmem_remove,
.drv = {
.name = "nd_pmem",
},
- .type = ND_DRIVER_NAMESPACE_IO,
+ .type = ND_DRIVER_NAMESPACE_IO | ND_DRIVER_NAMESPACE_PMEM,
};
static int __init pmem_init(void)
diff --git a/drivers/nvdimm/region.c b/drivers/nvdimm/region.c
index ade3dba81afd..9aba44e483e0 100644
--- a/drivers/nvdimm/region.c
+++ b/drivers/nvdimm/region.c
@@ -61,8 +61,11 @@ static int child_unregister(struct device *dev, void *data)
static int nd_region_remove(struct device *dev)
{
+ struct nd_region *nd_region = to_nd_region(dev);
+
/* flush attribute readers and disable */
nvdimm_bus_lock(dev);
+ nd_region->ns_seed = NULL;
dev_set_drvdata(dev, NULL);
nvdimm_bus_unlock(dev);
diff --git a/drivers/nvdimm/region_devs.c b/drivers/nvdimm/region_devs.c
index c99546ee10ab..1ce784fa858d 100644
--- a/drivers/nvdimm/region_devs.c
+++ b/drivers/nvdimm/region_devs.c
@@ -15,6 +15,7 @@
#include <linux/slab.h>
#include <linux/sort.h>
#include <linux/io.h>
+#include <linux/nd.h>
#include "nd-private.h"
#include "nd.h"
@@ -99,6 +100,58 @@ int nd_region_to_namespace_type(struct nd_region *nd_region)
return 0;
}
+EXPORT_SYMBOL(nd_region_to_namespace_type);
+
+static int is_uuid_busy(struct device *dev, void *data)
+{
+ struct nd_region *nd_region = to_nd_region(dev->parent);
+ u8 *uuid = data;
+
+ switch (nd_region_to_namespace_type(nd_region)) {
+ case ND_DEVICE_NAMESPACE_PMEM: {
+ struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
+
+ if (!nspm->uuid)
+ break;
+ if (memcmp(uuid, nspm->uuid, NSLABEL_UUID_LEN) == 0)
+ return -EBUSY;
+ break;
+ }
+ case ND_DEVICE_NAMESPACE_BLK: {
+ /* TODO: blk namespace support */
+ break;
+ }
+ default:
+ break;
+ }
+
+ return 0;
+}
+
+static int is_namespace_uuid_busy(struct device *dev, void *data)
+{
+ if (is_nd_pmem(dev) || is_nd_blk(dev))
+ return device_for_each_child(dev, data, is_uuid_busy);
+ return 0;
+}
+
+/**
+ * nd_is_uuid_unique - verify that no other namespace has @uuid
+ * @dev: any device on a nvdimm_bus
+ * @uuid: uuid to check
+ */
+bool nd_is_uuid_unique(struct device *dev, u8 *uuid)
+{
+ struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
+
+ if (!nvdimm_bus)
+ return false;
+ WARN_ON_ONCE(!is_nvdimm_bus_locked(&nvdimm_bus->dev));
+ if (device_for_each_child(&nvdimm_bus->dev, uuid,
+ is_namespace_uuid_busy) != 0)
+ return false;
+ return true;
+}
static ssize_t size_show(struct device *dev,
struct device_attribute *attr, char *buf)
@@ -151,6 +204,60 @@ static ssize_t set_cookie_show(struct device *dev,
}
static DEVICE_ATTR_RO(set_cookie);
+resource_size_t nd_region_available_dpa(struct nd_region *nd_region)
+{
+ resource_size_t blk_max_overlap = 0, available, overlap;
+ int i;
+
+ WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev));
+
+ retry:
+ available = 0;
+ overlap = blk_max_overlap;
+ for (i = 0; i < nd_region->ndr_mappings; i++) {
+ struct nd_mapping *nd_mapping = &nd_region->mapping[i];
+ struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
+
+ /* if a dimm is disabled the available capacity is zero */
+ if (!ndd)
+ return 0;
+
+ if (is_nd_pmem(&nd_region->dev)) {
+ available += nd_pmem_available_dpa(nd_region,
+ nd_mapping, &overlap);
+ if (overlap > blk_max_overlap) {
+ blk_max_overlap = overlap;
+ goto retry;
+ }
+ } else if (is_nd_blk(&nd_region->dev)) {
+ /* TODO: BLK Namespace support */
+ }
+ }
+
+ return available;
+}
+
+static ssize_t available_size_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct nd_region *nd_region = to_nd_region(dev);
+ unsigned long long available = 0;
+
+ /*
+ * Flush in-flight updates and grab a snapshot of the available
+ * size. Of course, this value is potentially invalidated the
+ * memory nvdimm_bus_lock() is dropped, but that's userspace's
+ * problem to not race itself.
+ */
+ nvdimm_bus_lock(dev);
+ wait_nvdimm_bus_probe_idle(dev);
+ available = nd_region_available_dpa(nd_region);
+ nvdimm_bus_unlock(dev);
+
+ return sprintf(buf, "%llu\n", available);
+}
+static DEVICE_ATTR_RO(available_size);
+
static ssize_t init_namespaces_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
@@ -168,11 +275,29 @@ static ssize_t init_namespaces_show(struct device *dev,
}
static DEVICE_ATTR_RO(init_namespaces);
+static ssize_t namespace_seed_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct nd_region *nd_region = to_nd_region(dev);
+ ssize_t rc;
+
+ nvdimm_bus_lock(dev);
+ if (nd_region->ns_seed)
+ rc = sprintf(buf, "%s\n", dev_name(nd_region->ns_seed));
+ else
+ rc = sprintf(buf, "\n");
+ nvdimm_bus_unlock(dev);
+ return rc;
+}
+static DEVICE_ATTR_RO(namespace_seed);
+
static struct attribute *nd_region_attributes[] = {
&dev_attr_size.attr,
&dev_attr_nstype.attr,
&dev_attr_mappings.attr,
&dev_attr_set_cookie.attr,
+ &dev_attr_available_size.attr,
+ &dev_attr_namespace_seed.attr,
&dev_attr_init_namespaces.attr,
NULL,
};
@@ -182,12 +307,17 @@ static umode_t nd_region_visible(struct kobject *kobj, struct attribute *a, int
struct device *dev = container_of(kobj, typeof(*dev), kobj);
struct nd_region *nd_region = to_nd_region(dev);
struct nd_interleave_set *nd_set = nd_region->nd_set;
+ int type = nd_region_to_namespace_type(nd_region);
- if (a != &dev_attr_set_cookie.attr)
+ if (a != &dev_attr_set_cookie.attr && a != &dev_attr_available_size.attr)
return a->mode;
- if (is_nd_pmem(dev) && nd_set)
- return a->mode;
+ if ((type == ND_DEVICE_NAMESPACE_PMEM
+ || type == ND_DEVICE_NAMESPACE_BLK)
+ && a == &dev_attr_available_size.attr)
+ return a->mode;
+ else if (is_nd_pmem(dev) && nd_set)
+ return a->mode;
return 0;
}
@@ -198,6 +328,15 @@ struct attribute_group nd_region_attribute_group = {
};
EXPORT_SYMBOL_GPL(nd_region_attribute_group);
+u64 nd_region_interleave_set_cookie(struct nd_region *nd_region)
+{
+ struct nd_interleave_set *nd_set = nd_region->nd_set;
+
+ if (nd_set)
+ return nd_set->cookie;
+ return 0;
+}
+
/*
* Upon successful probe/remove, take/release a reference on the
* associated interleave set (if present)
diff --git a/include/linux/libnvdimm.h b/include/linux/libnvdimm.h
index 0f3a6c6c1b73..ee59e788e5a1 100644
--- a/include/linux/libnvdimm.h
+++ b/include/linux/libnvdimm.h
@@ -41,8 +41,10 @@ typedef int (*ndctl_fn)(struct nvdimm_bus_descriptor *nd_desc,
struct nvdimm *nvdimm, unsigned int cmd, void *buf,
unsigned int buf_len);
+struct nd_namespace_label;
struct nd_mapping {
struct nvdimm *nvdimm;
+ struct nd_namespace_label **labels;
u64 start;
u64 size;
};
diff --git a/include/linux/nd.h b/include/linux/nd.h
index da70e9962197..255c38a83083 100644
--- a/include/linux/nd.h
+++ b/include/linux/nd.h
@@ -28,16 +28,40 @@ static inline struct nd_device_driver *to_nd_device_driver(
return container_of(drv, struct nd_device_driver, drv);
};
+/**
+ * struct nd_namespace_io - infrastructure for loading an nd_pmem instance
+ * @dev: namespace device created by the nd region driver
+ * @res: struct resource conversion of a NFIT SPA table
+ */
struct nd_namespace_io {
struct device dev;
struct resource res;
};
+/**
+ * struct nd_namespace_pmem - namespace device for dimm-backed interleaved memory
+ * @nsio: device and system physical address range to drive
+ * @alt_name: namespace name supplied in the dimm label
+ * @uuid: namespace name supplied in the dimm label
+ */
+struct nd_namespace_pmem {
+ struct nd_namespace_io nsio;
+ char *alt_name;
+ u8 *uuid;
+};
+
static inline struct nd_namespace_io *to_nd_namespace_io(struct device *dev)
{
return container_of(dev, struct nd_namespace_io, dev);
}
+static inline struct nd_namespace_pmem *to_nd_namespace_pmem(struct device *dev)
+{
+ struct nd_namespace_io *nsio = to_nd_namespace_io(dev);
+
+ return container_of(nsio, struct nd_namespace_pmem, nsio);
+}
+
#define MODULE_ALIAS_ND_DEVICE(type) \
MODULE_ALIAS("nd:t" __stringify(type) "*")
#define ND_DEVICE_MODALIAS_FMT "nd:t%d"
diff --git a/include/uapi/linux/ndctl.h b/include/uapi/linux/ndctl.h
index 74da204c423a..ac6d40f4fa7e 100644
--- a/include/uapi/linux/ndctl.h
+++ b/include/uapi/linux/ndctl.h
@@ -190,4 +190,8 @@ enum nd_driver_flags {
ND_DRIVER_NAMESPACE_PMEM = 1 << ND_DEVICE_NAMESPACE_PMEM,
ND_DRIVER_NAMESPACE_BLK = 1 << ND_DEVICE_NAMESPACE_BLK,
};
+
+enum {
+ ND_MIN_NAMESPACE_SIZE = 0x00400000,
+};
#endif /* __NDCTL_H__ */
^ permalink raw reply related [flat|nested] 47+ messages in thread
* [PATCH v5 14/21] libnvdimm: blk labels and namespace instantiation
2015-06-02 0:14 [PATCH v5 00/21] libnvdimm: non-volatile memory devices Dan Williams
` (12 preceding siblings ...)
2015-06-02 0:15 ` [PATCH v5 13/21] libnvdimm: pmem label sets and namespace instantiation Dan Williams
@ 2015-06-02 0:15 ` Dan Williams
2015-06-02 0:15 ` [PATCH v5 15/21] libnvdimm: write pmem label set Dan Williams
` (6 subsequent siblings)
20 siblings, 0 replies; 47+ messages in thread
From: Dan Williams @ 2015-06-02 0:15 UTC (permalink / raw)
To: linux-nvdimm
Cc: axboe, sfr, rafael, neilb, gregkh, linux-kernel, mingo,
linux-acpi, jmoyer, linux-api, akpm, hch
A blk label set describes a namespace comprised of one or more
discontiguous dpa ranges on a single dimm. They may alias with one or
more pmem interleave sets that include the given dimm.
This is the runtime/volatile configuration infrastructure for sysfs
manipulation of 'alt_name', 'uuid', 'size', and 'sector_size'. A later
patch will make these settings persistent by writing back the label(s).
Unlike pmem namespaces, multiple blk namespaces can be created per
region. Once a blk namespace has been created a new seed device
(unconfigured child of a parent blk region) is instantiated. As long as
a region has 'available_size' != 0 new child namespaces may be created.
Cc: Greg KH <gregkh@linuxfoundation.org>
Cc: Neil Brown <neilb@suse.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
drivers/nvdimm/core.c | 40 +++
drivers/nvdimm/dimm_devs.c | 35 +++
drivers/nvdimm/namespace_devs.c | 505 ++++++++++++++++++++++++++++++++++++---
drivers/nvdimm/nd-private.h | 8 +
drivers/nvdimm/nd.h | 5
drivers/nvdimm/region_devs.c | 15 +
include/linux/libnvdimm.h | 3
include/linux/nd.h | 25 ++
8 files changed, 591 insertions(+), 45 deletions(-)
diff --git a/drivers/nvdimm/core.c b/drivers/nvdimm/core.c
index 289b254f52b5..3cff35a94fb1 100644
--- a/drivers/nvdimm/core.c
+++ b/drivers/nvdimm/core.c
@@ -171,6 +171,46 @@ int nd_uuid_store(struct device *dev, u8 **uuid_out, const char *buf,
return 0;
}
+ssize_t nd_sector_size_show(unsigned long current_lbasize,
+ const unsigned long *supported, char *buf)
+{
+ ssize_t len = 0;
+ int i;
+
+ for (i = 0; supported[i]; i++)
+ if (current_lbasize == supported[i])
+ len += sprintf(buf + len, "[%ld] ", supported[i]);
+ else
+ len += sprintf(buf + len, "%ld ", supported[i]);
+ len += sprintf(buf + len, "\n");
+ return len;
+}
+
+ssize_t nd_sector_size_store(struct device *dev, const char *buf,
+ unsigned long *current_lbasize, const unsigned long *supported)
+{
+ unsigned long lbasize;
+ int rc, i;
+
+ if (dev->driver)
+ return -EBUSY;
+
+ rc = kstrtoul(buf, 0, &lbasize);
+ if (rc)
+ return rc;
+
+ for (i = 0; supported[i]; i++)
+ if (lbasize == supported[i])
+ break;
+
+ if (supported[i]) {
+ *current_lbasize = lbasize;
+ return 0;
+ } else {
+ return -EINVAL;
+ }
+}
+
static ssize_t commands_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
diff --git a/drivers/nvdimm/dimm_devs.c b/drivers/nvdimm/dimm_devs.c
index a6ef75433747..2132195cb2ec 100644
--- a/drivers/nvdimm/dimm_devs.c
+++ b/drivers/nvdimm/dimm_devs.c
@@ -256,6 +256,41 @@ struct nvdimm *nvdimm_create(struct nvdimm_bus *nvdimm_bus, void *provider_data,
EXPORT_SYMBOL_GPL(nvdimm_create);
/**
+ * nd_blk_available_dpa - account the unused dpa of BLK region
+ * @nd_mapping: container of dpa-resource-root + labels
+ *
+ * Unlike PMEM, BLK namespaces can occupy discontiguous DPA ranges.
+ */
+resource_size_t nd_blk_available_dpa(struct nd_mapping *nd_mapping)
+{
+ struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
+ resource_size_t map_end, busy = 0, available;
+ struct resource *res;
+
+ if (!ndd)
+ return 0;
+
+ map_end = nd_mapping->start + nd_mapping->size - 1;
+ for_each_dpa_resource(ndd, res)
+ if (res->start >= nd_mapping->start && res->start < map_end) {
+ resource_size_t end = min(map_end, res->end);
+
+ busy += end - res->start + 1;
+ } else if (res->end >= nd_mapping->start && res->end <= map_end) {
+ busy += res->end - nd_mapping->start;
+ } else if (nd_mapping->start > res->start
+ && nd_mapping->start < res->end) {
+ /* total eclipse of the BLK region mapping */
+ busy += nd_mapping->size;
+ }
+
+ available = map_end - nd_mapping->start + 1;
+ if (busy < available)
+ return available - busy;
+ return 0;
+}
+
+/**
* nd_pmem_available_dpa - for the given dimm+region account unallocated dpa
* @nd_mapping: container of dpa-resource-root + labels
* @nd_region: constrain available space check to this reference region
diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c
index 3ff2caab4f0b..6a3856b35d7a 100644
--- a/drivers/nvdimm/namespace_devs.c
+++ b/drivers/nvdimm/namespace_devs.c
@@ -37,7 +37,15 @@ static void namespace_pmem_release(struct device *dev)
static void namespace_blk_release(struct device *dev)
{
- /* TODO: blk namespace support */
+ struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
+ struct nd_region *nd_region = to_nd_region(dev->parent);
+
+ if (nsblk->id >= 0)
+ ida_simple_remove(&nd_region->ns_ida, nsblk->id);
+ kfree(nsblk->alt_name);
+ kfree(nsblk->uuid);
+ kfree(nsblk->res);
+ kfree(nsblk);
}
static struct device_type namespace_io_device_type = {
@@ -90,8 +98,9 @@ static ssize_t __alt_name_store(struct device *dev, const char *buf,
ns_altname = &nspm->alt_name;
} else if (is_namespace_blk(dev)) {
- /* TODO: blk namespace support */
- return -ENXIO;
+ struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
+
+ ns_altname = &nsblk->alt_name;
} else
return -ENXIO;
@@ -124,6 +133,24 @@ out:
return rc;
}
+static resource_size_t nd_namespace_blk_size(struct nd_namespace_blk *nsblk)
+{
+ struct nd_region *nd_region = to_nd_region(nsblk->dev.parent);
+ struct nd_mapping *nd_mapping = &nd_region->mapping[0];
+ struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
+ struct nd_label_id label_id;
+ resource_size_t size = 0;
+ struct resource *res;
+
+ if (!nsblk->uuid)
+ return 0;
+ nd_label_gen_id(&label_id, nsblk->uuid, NSLABEL_FLAG_LOCAL);
+ for_each_dpa_resource(ndd, res)
+ if (strcmp(res->name, label_id.id) == 0)
+ size += resource_size(res);
+ return size;
+}
+
static ssize_t alt_name_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t len)
{
@@ -150,8 +177,9 @@ static ssize_t alt_name_show(struct device *dev,
ns_altname = nspm->alt_name;
} else if (is_namespace_blk(dev)) {
- /* TODO: blk namespace support */
- return -ENXIO;
+ struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
+
+ ns_altname = nsblk->alt_name;
} else
return -ENXIO;
@@ -197,6 +225,8 @@ static int scan_free(struct nd_region *nd_region,
new_start = res->start;
rc = adjust_resource(res, new_start, resource_size(res) - n);
+ if (rc == 0)
+ res->flags |= DPA_RESOURCE_ADJUSTED;
nd_dbg_dpa(nd_region, ndd, res, "shrink %d\n", rc);
break;
}
@@ -257,14 +287,15 @@ static resource_size_t init_dpa_allocation(struct nd_label_id *label_id,
return rc ? n : 0;
}
-static bool space_valid(bool is_pmem, struct nd_label_id *label_id,
- struct resource *res)
+static bool space_valid(bool is_pmem, bool is_reserve,
+ struct nd_label_id *label_id, struct resource *res)
{
/*
* For BLK-space any space is valid, for PMEM-space, it must be
- * contiguous with an existing allocation.
+ * contiguous with an existing allocation unless we are
+ * reserving pmem.
*/
- if (!is_pmem)
+ if (is_reserve || !is_pmem)
return true;
if (!res || strcmp(res->name, label_id->id) == 0)
return true;
@@ -280,6 +311,7 @@ static resource_size_t scan_allocate(struct nd_region *nd_region,
resource_size_t n)
{
resource_size_t mapping_end = nd_mapping->start + nd_mapping->size - 1;
+ bool is_reserve = strcmp(label_id->id, "pmem-reserve") == 0;
bool is_pmem = strncmp(label_id->id, "pmem", 4) == 0;
struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
const resource_size_t to_allocate = n;
@@ -305,7 +337,7 @@ static resource_size_t scan_allocate(struct nd_region *nd_region,
if (!first++ && res->start > nd_mapping->start) {
free_start = nd_mapping->start;
available = res->start - free_start;
- if (space_valid(is_pmem, label_id, NULL))
+ if (space_valid(is_pmem, is_reserve, label_id, NULL))
loc = ALLOC_BEFORE;
}
@@ -313,7 +345,7 @@ static resource_size_t scan_allocate(struct nd_region *nd_region,
if (!loc && next) {
free_start = res->start + resource_size(res);
free_end = min(mapping_end, next->start - 1);
- if (space_valid(is_pmem, label_id, res)
+ if (space_valid(is_pmem, is_reserve, label_id, res)
&& free_start < free_end) {
available = free_end + 1 - free_start;
loc = ALLOC_MID;
@@ -324,7 +356,7 @@ static resource_size_t scan_allocate(struct nd_region *nd_region,
if (!loc && !next) {
free_start = res->start + resource_size(res);
free_end = mapping_end;
- if (space_valid(is_pmem, label_id, res)
+ if (space_valid(is_pmem, is_reserve, label_id, res)
&& free_start < free_end) {
available = free_end + 1 - free_start;
loc = ALLOC_AFTER;
@@ -338,7 +370,7 @@ static resource_size_t scan_allocate(struct nd_region *nd_region,
case ALLOC_BEFORE:
if (strcmp(res->name, label_id->id) == 0) {
/* adjust current resource up */
- if (is_pmem)
+ if (is_pmem && !is_reserve)
return n;
rc = adjust_resource(res, res->start - allocate,
resource_size(res) + allocate);
@@ -349,7 +381,7 @@ static resource_size_t scan_allocate(struct nd_region *nd_region,
case ALLOC_MID:
if (strcmp(next->name, label_id->id) == 0) {
/* adjust next resource up */
- if (is_pmem)
+ if (is_pmem && !is_reserve)
return n;
rc = adjust_resource(next, next->start
- allocate, resource_size(next)
@@ -375,7 +407,7 @@ static resource_size_t scan_allocate(struct nd_region *nd_region,
/* BLK allocate bottom up */
if (!is_pmem)
free_start += available - allocate;
- else if (free_start != nd_mapping->start)
+ else if (!is_reserve && free_start != nd_mapping->start)
return n;
new_res = nvdimm_allocate_dpa(ndd, label_id,
@@ -386,6 +418,8 @@ static resource_size_t scan_allocate(struct nd_region *nd_region,
/* adjust current resource down */
rc = adjust_resource(res, res->start, resource_size(res)
+ allocate);
+ if (rc == 0)
+ res->flags |= DPA_RESOURCE_ADJUSTED;
}
if (!new_res)
@@ -411,11 +445,106 @@ static resource_size_t scan_allocate(struct nd_region *nd_region,
return 0;
}
- if (is_pmem && n == to_allocate)
+ /*
+ * If we allocated nothing in the BLK case it may be because we are in
+ * an initial "pmem-reserve pass". Only do an initial BLK allocation
+ * when none of the DPA space is reserved.
+ */
+ if ((is_pmem || !ndd->dpa.child) && n == to_allocate)
return init_dpa_allocation(label_id, nd_region, nd_mapping, n);
return n;
}
+static int merge_dpa(struct nd_region *nd_region,
+ struct nd_mapping *nd_mapping, struct nd_label_id *label_id)
+{
+ struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
+ struct resource *res;
+
+ if (strncmp("pmem", label_id->id, 4) == 0)
+ return 0;
+ retry:
+ for_each_dpa_resource(ndd, res) {
+ int rc;
+ struct resource *next = res->sibling;
+ resource_size_t end = res->start + resource_size(res);
+
+ if (!next || strcmp(res->name, label_id->id) != 0
+ || strcmp(next->name, label_id->id) != 0
+ || end != next->start)
+ continue;
+ end += resource_size(next);
+ nvdimm_free_dpa(ndd, next);
+ rc = adjust_resource(res, res->start, end - res->start);
+ nd_dbg_dpa(nd_region, ndd, res, "merge %d\n", rc);
+ if (rc)
+ return rc;
+ res->flags |= DPA_RESOURCE_ADJUSTED;
+ goto retry;
+ }
+
+ return 0;
+}
+
+static int __reserve_free_pmem(struct device *dev, void *data)
+{
+ struct nvdimm *nvdimm = data;
+ struct nd_region *nd_region;
+ struct nd_label_id label_id;
+ int i;
+
+ if (!is_nd_pmem(dev))
+ return 0;
+
+ nd_region = to_nd_region(dev);
+ if (nd_region->ndr_mappings == 0)
+ return 0;
+
+ memset(&label_id, 0, sizeof(label_id));
+ strcat(label_id.id, "pmem-reserve");
+ for (i = 0; i < nd_region->ndr_mappings; i++) {
+ struct nd_mapping *nd_mapping = &nd_region->mapping[i];
+ resource_size_t n, rem = 0;
+
+ if (nd_mapping->nvdimm != nvdimm)
+ continue;
+
+ n = nd_pmem_available_dpa(nd_region, nd_mapping, &rem);
+ if (n == 0)
+ return 0;
+ rem = scan_allocate(nd_region, nd_mapping, &label_id, n);
+ dev_WARN_ONCE(&nd_region->dev, rem,
+ "pmem reserve underrun: %#llx of %#llx bytes\n",
+ (unsigned long long) n - rem,
+ (unsigned long long) n);
+ return rem ? -ENXIO : 0;
+ }
+
+ return 0;
+}
+
+static void release_free_pmem(struct nvdimm_bus *nvdimm_bus, struct nd_mapping *nd_mapping)
+{
+ struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
+ struct resource *res, *_res;
+
+ for_each_dpa_resource_safe(ndd, res, _res)
+ if (strcmp(res->name, "pmem-reserve") == 0)
+ nvdimm_free_dpa(ndd, res);
+}
+
+static int reserve_free_pmem(struct nvdimm_bus *nvdimm_bus,
+ struct nd_mapping *nd_mapping)
+{
+ struct nvdimm *nvdimm = nd_mapping->nvdimm;
+ int rc;
+
+ rc = device_for_each_child(&nvdimm_bus->dev, nvdimm, __reserve_free_pmem);
+ if (rc)
+ release_free_pmem(nvdimm_bus, nd_mapping);
+ return rc;
+}
+
/**
* grow_dpa_allocation - for each dimm allocate n bytes for @label_id
* @nd_region: the set of dimms to allocate @n more bytes from
@@ -432,13 +561,44 @@ static resource_size_t scan_allocate(struct nd_region *nd_region,
static int grow_dpa_allocation(struct nd_region *nd_region,
struct nd_label_id *label_id, resource_size_t n)
{
+ struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(&nd_region->dev);
+ bool is_pmem = strncmp(label_id->id, "pmem", 4) == 0;
int i;
for (i = 0; i < nd_region->ndr_mappings; i++) {
struct nd_mapping *nd_mapping = &nd_region->mapping[i];
- int rc;
+ resource_size_t rem = n;
+ int rc, j;
+
+ /*
+ * In the BLK case try once with all unallocated PMEM
+ * reserved, and once without
+ */
+ for (j = is_pmem; j < 2; j++) {
+ bool blk_only = j == 0;
+
+ if (blk_only) {
+ rc = reserve_free_pmem(nvdimm_bus, nd_mapping);
+ if (rc)
+ return rc;
+ }
+ rem = scan_allocate(nd_region, nd_mapping, label_id, rem);
+ if (blk_only)
+ release_free_pmem(nvdimm_bus, nd_mapping);
+
+ /* try again and allow encroachments into PMEM */
+ if (rem == 0)
+ break;
+ }
- rc = scan_allocate(nd_region, nd_mapping, label_id, n);
+ dev_WARN_ONCE(&nd_region->dev, rem,
+ "allocation underrun: %#llx of %#llx bytes\n",
+ (unsigned long long) n - rem,
+ (unsigned long long) n);
+ if (rem)
+ return -ENXIO;
+
+ rc = merge_dpa(nd_region, nd_mapping, label_id);
if (rc)
return rc;
}
@@ -474,8 +634,10 @@ static ssize_t __size_store(struct device *dev, unsigned long long val)
uuid = nspm->uuid;
} else if (is_namespace_blk(dev)) {
- /* TODO: blk namespace support */
- return -ENXIO;
+ struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
+
+ uuid = nsblk->uuid;
+ flags = NSLABEL_FLAG_LOCAL;
}
/*
@@ -529,6 +691,14 @@ static ssize_t __size_store(struct device *dev, unsigned long long val)
nd_namespace_pmem_set_size(nd_region, nspm,
val * nd_region->ndr_mappings);
+ } else if (is_namespace_blk(dev)) {
+ /*
+ * Try to delete the namespace if we deleted all of its
+ * allocation and this is not the seed device for the
+ * region.
+ */
+ if (val == 0 && nd_region->ns_seed != dev)
+ nd_device_unregister(dev, ND_ASYNC);
}
return rc;
@@ -555,8 +725,9 @@ static ssize_t size_store(struct device *dev,
uuid = &nspm->uuid;
} else if (is_namespace_blk(dev)) {
- /* TODO: blk namespace support */
- rc = -ENXIO;
+ struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
+
+ uuid = &nsblk->uuid;
}
if (rc == 0 && val == 0 && uuid) {
@@ -577,21 +748,23 @@ static ssize_t size_store(struct device *dev,
static ssize_t size_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
+ unsigned long long size = 0;
+
+ nvdimm_bus_lock(dev);
if (is_namespace_pmem(dev)) {
struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
- return sprintf(buf, "%llu\n", (unsigned long long)
- resource_size(&nspm->nsio.res));
+ size = resource_size(&nspm->nsio.res);
} else if (is_namespace_blk(dev)) {
- /* TODO: blk namespace support */
- return -ENXIO;
+ size = nd_namespace_blk_size(to_nd_namespace_blk(dev));
} else if (is_namespace_io(dev)) {
struct nd_namespace_io *nsio = to_nd_namespace_io(dev);
- return sprintf(buf, "%llu\n", (unsigned long long)
- resource_size(&nsio->res));
- } else
- return -ENXIO;
+ size = resource_size(&nsio->res);
+ }
+ nvdimm_bus_unlock(dev);
+
+ return sprintf(buf, "%llu\n", size);
}
static DEVICE_ATTR(size, S_IRUGO, size_show, size_store);
@@ -605,8 +778,9 @@ static ssize_t uuid_show(struct device *dev,
uuid = nspm->uuid;
} else if (is_namespace_blk(dev)) {
- /* TODO: blk namespace support */
- return -ENXIO;
+ struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
+
+ uuid = nsblk->uuid;
} else
return -ENXIO;
@@ -670,8 +844,9 @@ static ssize_t uuid_store(struct device *dev,
ns_uuid = &nspm->uuid;
} else if (is_namespace_blk(dev)) {
- /* TODO: blk namespace support */
- return -ENXIO;
+ struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
+
+ ns_uuid = &nsblk->uuid;
} else
return -ENXIO;
@@ -713,12 +888,48 @@ static ssize_t resource_show(struct device *dev,
}
static DEVICE_ATTR_RO(resource);
+static const unsigned long ns_lbasize_supported[] = { 512, 0 };
+
+static ssize_t sector_size_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
+
+ if (!is_namespace_blk(dev))
+ return -ENXIO;
+
+ return nd_sector_size_show(nsblk->lbasize, ns_lbasize_supported, buf);
+}
+
+static ssize_t sector_size_store(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t len)
+{
+ struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
+ ssize_t rc;
+
+ if (!is_namespace_blk(dev))
+ return -ENXIO;
+
+ device_lock(dev);
+ nvdimm_bus_lock(dev);
+ rc = nd_sector_size_store(dev, buf, &nsblk->lbasize,
+ ns_lbasize_supported);
+ dev_dbg(dev, "%s: result: %zd wrote: %s%s", __func__,
+ rc, buf, buf[len - 1] == '\n' ? "" : "\n");
+ nvdimm_bus_unlock(dev);
+ device_unlock(dev);
+
+ return rc ? rc : len;
+}
+static DEVICE_ATTR_RW(sector_size);
+
static struct attribute *nd_namespace_attributes[] = {
&dev_attr_nstype.attr,
&dev_attr_size.attr,
&dev_attr_uuid.attr,
&dev_attr_resource.attr,
&dev_attr_alt_name.attr,
+ &dev_attr_sector_size.attr,
NULL,
};
@@ -735,6 +946,10 @@ static umode_t nd_namespace_attr_visible(struct kobject *kobj, struct attribute
if (is_namespace_pmem(dev) || is_namespace_blk(dev)) {
if (a == &dev_attr_size.attr)
return S_IWUSR | S_IRUGO;
+
+ if (is_namespace_pmem(dev) && a == &dev_attr_sector_size.attr)
+ return 0;
+
return a->mode;
}
@@ -1029,6 +1244,174 @@ static struct device **create_namespace_pmem(struct nd_region *nd_region)
return NULL;
}
+struct resource *nsblk_add_resource(struct nd_region *nd_region,
+ struct nvdimm_drvdata *ndd, struct nd_namespace_blk *nsblk,
+ resource_size_t start)
+{
+ struct nd_label_id label_id;
+ struct resource *res;
+
+ nd_label_gen_id(&label_id, nsblk->uuid, NSLABEL_FLAG_LOCAL);
+ res = krealloc(nsblk->res,
+ sizeof(void *) * (nsblk->num_resources + 1),
+ GFP_KERNEL);
+ if (!res)
+ return NULL;
+ nsblk->res = (struct resource **) res;
+ for_each_dpa_resource(ndd, res)
+ if (strcmp(res->name, label_id.id) == 0 && res->start == start) {
+ nsblk->res[nsblk->num_resources++] = res;
+ return res;
+ }
+ return NULL;
+}
+
+static struct device *nd_namespace_blk_create(struct nd_region *nd_region)
+{
+ struct nd_namespace_blk *nsblk;
+ struct device *dev;
+
+ if (!is_nd_blk(&nd_region->dev))
+ return NULL;
+
+ nsblk = kzalloc(sizeof(*nsblk), GFP_KERNEL);
+ if (!nsblk)
+ return NULL;
+
+ dev = &nsblk->dev;
+ dev->type = &namespace_blk_device_type;
+ nsblk->id = ida_simple_get(&nd_region->ns_ida, 0, 0, GFP_KERNEL);
+ if (nsblk->id < 0) {
+ kfree(nsblk);
+ return NULL;
+ }
+ dev_set_name(dev, "namespace%d.%d", nd_region->id, nsblk->id);
+ dev->parent = &nd_region->dev;
+ dev->groups = nd_namespace_attribute_groups;
+
+ return &nsblk->dev;
+}
+
+void nd_region_create_blk_seed(struct nd_region *nd_region)
+{
+ WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev));
+ nd_region->ns_seed = nd_namespace_blk_create(nd_region);
+ /*
+ * Seed creation failures are not fatal, provisioning is simply
+ * disabled until memory becomes available
+ */
+ if (!nd_region->ns_seed)
+ dev_err(&nd_region->dev, "failed to create blk namespace\n");
+ else
+ nd_device_register(nd_region->ns_seed);
+}
+
+static struct device **create_namespace_blk(struct nd_region *nd_region)
+{
+ struct nd_mapping *nd_mapping = &nd_region->mapping[0];
+ struct nd_namespace_label __iomem *nd_label;
+ struct device *dev, **devs = NULL;
+ u8 label_uuid[NSLABEL_UUID_LEN];
+ struct nd_namespace_blk *nsblk;
+ struct nvdimm_drvdata *ndd;
+ int i, l, count = 0;
+ struct resource *res;
+
+ if (nd_region->ndr_mappings == 0)
+ return NULL;
+
+ ndd = to_ndd(nd_mapping);
+ for_each_label(l, nd_label, nd_mapping->labels) {
+ u32 flags = readl(&nd_label->flags);
+ char *name[NSLABEL_NAME_LEN];
+ struct device **__devs;
+
+ if (flags & NSLABEL_FLAG_LOCAL)
+ /* pass */;
+ else
+ continue;
+
+ memcpy_fromio(label_uuid, nd_label->uuid, NSLABEL_UUID_LEN);
+ for (i = 0; i < count; i++) {
+ nsblk = to_nd_namespace_blk(devs[i]);
+ if (memcmp(nsblk->uuid, label_uuid,
+ NSLABEL_UUID_LEN) == 0) {
+ res = nsblk_add_resource(nd_region, ndd, nsblk,
+ readq(&nd_label->dpa));
+ if (!res)
+ goto err;
+ nd_dbg_dpa(nd_region, ndd, res, "%s assign\n",
+ dev_name(&nsblk->dev));
+ break;
+ }
+ }
+ if (i < count)
+ continue;
+ __devs = kcalloc(count + 2, sizeof(dev), GFP_KERNEL);
+ if (!__devs)
+ goto err;
+ memcpy(__devs, devs, sizeof(dev) * count);
+ kfree(devs);
+ devs = __devs;
+
+ nsblk = kzalloc(sizeof(*nsblk), GFP_KERNEL);
+ if (!nsblk)
+ goto err;
+ dev = &nsblk->dev;
+ dev->type = &namespace_blk_device_type;
+ dev_set_name(dev, "namespace%d.%d", nd_region->id, count);
+ devs[count++] = dev;
+ nsblk->id = -1;
+ nsblk->lbasize = readq(&nd_label->lbasize);
+ nsblk->uuid = kmemdup(label_uuid, NSLABEL_UUID_LEN, GFP_KERNEL);
+ if (!nsblk->uuid)
+ goto err;
+ memcpy_fromio(name, nd_label->name, NSLABEL_NAME_LEN);
+ if (name[0])
+ nsblk->alt_name = kmemdup(name, NSLABEL_NAME_LEN,
+ GFP_KERNEL);
+ res = nsblk_add_resource(nd_region, ndd, nsblk,
+ readq(&nd_label->dpa));
+ if (!res)
+ goto err;
+ nd_dbg_dpa(nd_region, ndd, res, "%s assign\n",
+ dev_name(&nsblk->dev));
+ }
+
+ dev_dbg(&nd_region->dev, "%s: discovered %d blk namespace%s\n",
+ __func__, count, count == 1 ? "" : "s");
+
+ if (count == 0) {
+ /* Publish a zero-sized namespace for userspace to configure. */
+ for (i = 0; i < nd_region->ndr_mappings; i++) {
+ struct nd_mapping *nd_mapping = &nd_region->mapping[i];
+
+ kfree(nd_mapping->labels);
+ nd_mapping->labels = NULL;
+ }
+
+ devs = kcalloc(2, sizeof(dev), GFP_KERNEL);
+ if (!devs)
+ goto err;
+ nsblk = kzalloc(sizeof(*nsblk), GFP_KERNEL);
+ if (!nsblk)
+ goto err;
+ dev = &nsblk->dev;
+ dev->type = &namespace_blk_device_type;
+ devs[count++] = dev;
+ }
+
+ return devs;
+
+err:
+ for (i = 0; i < count; i++) {
+ nsblk = to_nd_namespace_blk(devs[i]);
+ namespace_blk_release(&nsblk->dev);
+ }
+ kfree(devs);
+ return NULL;
+}
+
static int init_active_labels(struct nd_region *nd_region)
{
int i;
@@ -1092,6 +1475,9 @@ int nd_region_register_namespaces(struct nd_region *nd_region, int *err)
case ND_DEVICE_NAMESPACE_PMEM:
devs = create_namespace_pmem(nd_region);
break;
+ case ND_DEVICE_NAMESPACE_BLK:
+ devs = create_namespace_blk(nd_region);
+ break;
default:
break;
}
@@ -1102,26 +1488,59 @@ int nd_region_register_namespaces(struct nd_region *nd_region, int *err)
goto err;
}
- nd_region->ns_seed = devs[0];
for (i = 0; devs[i]; i++) {
struct device *dev = devs[i];
+ int id;
+
+ if (type == ND_DEVICE_NAMESPACE_BLK) {
+ struct nd_namespace_blk *nsblk;
- dev_set_name(dev, "namespace%d.%d", nd_region->id, i);
+ nsblk = to_nd_namespace_blk(dev);
+ id = ida_simple_get(&nd_region->ns_ida, 0, 0,
+ GFP_KERNEL);
+ nsblk->id = id;
+ } else
+ id = i;
+
+ if (id < 0)
+ break;
+ dev_set_name(dev, "namespace%d.%d", nd_region->id, id);
dev->parent = &nd_region->dev;
dev->groups = nd_namespace_attribute_groups;
nd_device_register(dev);
}
- kfree(devs);
+ if (i)
+ nd_region->ns_seed = devs[0];
- return i;
+ if (devs[i]) {
+ int j;
+
+ for (j = i; devs[j]; j++) {
+ struct device *dev = devs[j];
+
+ device_initialize(dev);
+ put_device(dev);
+ }
+ *err = j - i;
+ /*
+ * All of the namespaces we tried to register failed, so
+ * fail region activation.
+ */
+ if (*err == 0)
+ rc = -ENODEV;
+ }
+ kfree(devs);
err:
- for (i = 0; i < nd_region->ndr_mappings; i++) {
- struct nd_mapping *nd_mapping = &nd_region->mapping[i];
+ if (rc == -ENODEV) {
+ for (i = 0; i < nd_region->ndr_mappings; i++) {
+ struct nd_mapping *nd_mapping = &nd_region->mapping[i];
- kfree(nd_mapping->labels);
- nd_mapping->labels = NULL;
+ kfree(nd_mapping->labels);
+ nd_mapping->labels = NULL;
+ }
+ return rc;
}
- return rc;
+ return i;
}
diff --git a/drivers/nvdimm/nd-private.h b/drivers/nvdimm/nd-private.h
index 574174f6461e..0d39cc1ba084 100644
--- a/drivers/nvdimm/nd-private.h
+++ b/drivers/nvdimm/nd-private.h
@@ -17,6 +17,7 @@
#include <linux/libnvdimm.h>
#include <linux/sizes.h>
#include <linux/mutex.h>
+#include <linux/nd.h>
extern struct list_head nvdimm_bus_list;
extern struct mutex nvdimm_bus_list_mutex;
@@ -49,6 +50,8 @@ int __init nvdimm_bus_init(void);
void nvdimm_bus_exit(void);
void nd_region_probe_start(struct nvdimm_bus *nvdimm_bus, struct device *dev);
void nd_region_probe_end(struct nvdimm_bus *nvdimm_bus, struct device *dev, int rc);
+struct nd_region;
+void nd_region_create_blk_seed(struct nd_region *nd_region);
void nd_region_notify_remove(struct nvdimm_bus *nvdimm_bus, struct device *dev, int rc);
int nvdimm_bus_create_ndctl(struct nvdimm_bus *nvdimm_bus);
void nvdimm_bus_destroy_ndctl(struct nvdimm_bus *nvdimm_bus);
@@ -65,7 +68,12 @@ struct nvdimm_drvdata;
struct nd_mapping;
resource_size_t nd_pmem_available_dpa(struct nd_region *nd_region,
struct nd_mapping *nd_mapping, resource_size_t *overlap);
+resource_size_t nd_blk_available_dpa(struct nd_mapping *nd_mapping);
resource_size_t nd_region_available_dpa(struct nd_region *nd_region);
resource_size_t nvdimm_allocated_dpa(struct nvdimm_drvdata *ndd,
struct nd_label_id *label_id);
+struct nd_mapping;
+struct resource *nsblk_add_resource(struct nd_region *nd_region,
+ struct nvdimm_drvdata *ndd, struct nd_namespace_blk *nsblk,
+ resource_size_t start);
#endif /* __ND_PRIVATE_H__ */
diff --git a/drivers/nvdimm/nd.h b/drivers/nvdimm/nd.h
index 2bc087236062..7422cf35c067 100644
--- a/drivers/nvdimm/nd.h
+++ b/drivers/nvdimm/nd.h
@@ -90,6 +90,7 @@ static inline struct nd_namespace_label __iomem *nd_get_label(
struct nd_region {
struct device dev;
+ struct ida ns_ida;
struct device *ns_seed;
u16 ndr_mappings;
u64 ndr_size;
@@ -119,6 +120,10 @@ void nd_device_register(struct device *dev);
void nd_device_unregister(struct device *dev, enum nd_async_mode mode);
int nd_uuid_store(struct device *dev, u8 **uuid_out, const char *buf,
size_t len);
+ssize_t nd_sector_size_show(unsigned long current_lbasize,
+ const unsigned long *supported, char *buf);
+ssize_t nd_sector_size_store(struct device *dev, const char *buf,
+ unsigned long *current_lbasize, const unsigned long *supported);
int __init nvdimm_init(void);
int __init nd_region_init(void);
void nvdimm_exit(void);
diff --git a/drivers/nvdimm/region_devs.c b/drivers/nvdimm/region_devs.c
index 1ce784fa858d..35ac1bbec683 100644
--- a/drivers/nvdimm/region_devs.c
+++ b/drivers/nvdimm/region_devs.c
@@ -118,7 +118,12 @@ static int is_uuid_busy(struct device *dev, void *data)
break;
}
case ND_DEVICE_NAMESPACE_BLK: {
- /* TODO: blk namespace support */
+ struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
+
+ if (!nsblk->uuid)
+ break;
+ if (memcmp(uuid, nsblk->uuid, NSLABEL_UUID_LEN) == 0)
+ return -EBUSY;
break;
}
default:
@@ -230,7 +235,7 @@ resource_size_t nd_region_available_dpa(struct nd_region *nd_region)
goto retry;
}
} else if (is_nd_blk(&nd_region->dev)) {
- /* TODO: BLK Namespace support */
+ available += nd_blk_available_dpa(nd_mapping);
}
}
@@ -360,6 +365,11 @@ static void nd_region_notify_driver_action(struct nvdimm_bus *nvdimm_bus,
else
atomic_dec(&nvdimm->busy);
}
+ } else if (dev->parent && is_nd_blk(dev->parent) && probe && rc == 0) {
+ struct nd_region *nd_region = to_nd_region(dev->parent);
+
+ if (nd_region->ns_seed == dev)
+ nd_region_create_blk_seed(nd_region);
}
}
@@ -546,6 +556,7 @@ static noinline struct nd_region *nd_region_create(struct nvdimm_bus *nvdimm_bus
nd_region->ndr_mappings = ndr_desc->num_mappings;
nd_region->provider_data = ndr_desc->provider_data;
nd_region->nd_set = ndr_desc->nd_set;
+ ida_init(&nd_region->ns_ida);
dev = &nd_region->dev;
dev_set_name(dev, "region%d", nd_region->id);
dev->parent = &nvdimm_bus->dev;
diff --git a/include/linux/libnvdimm.h b/include/linux/libnvdimm.h
index ee59e788e5a1..79a40c23545d 100644
--- a/include/linux/libnvdimm.h
+++ b/include/linux/libnvdimm.h
@@ -27,6 +27,9 @@ enum {
ND_CMD_MAX_ENVELOPE = 16,
ND_CMD_ARS_QUERY_MAX = SZ_4K,
ND_MAX_MAPPINGS = 32,
+
+ /* mark newly adjusted resources as requiring a label update */
+ DPA_RESOURCE_ADJUSTED = 1 << 0,
};
extern struct attribute_group nvdimm_bus_attribute_group;
diff --git a/include/linux/nd.h b/include/linux/nd.h
index 255c38a83083..23276ea91690 100644
--- a/include/linux/nd.h
+++ b/include/linux/nd.h
@@ -50,6 +50,26 @@ struct nd_namespace_pmem {
u8 *uuid;
};
+/**
+ * struct nd_namespace_blk - namespace for dimm-bounded persistent memory
+ * @dev: namespace device creation by the nd region driver
+ * @alt_name: namespace name supplied in the dimm label
+ * @uuid: namespace name supplied in the dimm label
+ * @id: ida allocated id
+ * @lbasize: blk namespaces have a native sector size when btt not present
+ * @num_resources: number of dpa extents to claim
+ * @res: discontiguous dpa extents for given dimm
+ */
+struct nd_namespace_blk {
+ struct device dev;
+ char *alt_name;
+ u8 *uuid;
+ int id;
+ unsigned long lbasize;
+ int num_resources;
+ struct resource **res;
+};
+
static inline struct nd_namespace_io *to_nd_namespace_io(struct device *dev)
{
return container_of(dev, struct nd_namespace_io, dev);
@@ -62,6 +82,11 @@ static inline struct nd_namespace_pmem *to_nd_namespace_pmem(struct device *dev)
return container_of(nsio, struct nd_namespace_pmem, nsio);
}
+static inline struct nd_namespace_blk *to_nd_namespace_blk(struct device *dev)
+{
+ return container_of(dev, struct nd_namespace_blk, dev);
+}
+
#define MODULE_ALIAS_ND_DEVICE(type) \
MODULE_ALIAS("nd:t" __stringify(type) "*")
#define ND_DEVICE_MODALIAS_FMT "nd:t%d"
^ permalink raw reply related [flat|nested] 47+ messages in thread
* [PATCH v5 15/21] libnvdimm: write pmem label set
2015-06-02 0:14 [PATCH v5 00/21] libnvdimm: non-volatile memory devices Dan Williams
` (13 preceding siblings ...)
2015-06-02 0:15 ` [PATCH v5 14/21] libnvdimm: blk labels " Dan Williams
@ 2015-06-02 0:15 ` Dan Williams
2015-06-02 0:15 ` [PATCH v5 16/21] libnvdimm: write blk " Dan Williams
` (5 subsequent siblings)
20 siblings, 0 replies; 47+ messages in thread
From: Dan Williams @ 2015-06-02 0:15 UTC (permalink / raw)
To: linux-nvdimm
Cc: axboe, sfr, rafael, neilb, gregkh, linux-kernel, mingo,
linux-acpi, jmoyer, linux-api, akpm, hch
After 'uuid', 'size', and optionally 'alt_name' have been set to valid
values the labels on the dimms can be updated.
Write procedure is:
1/ Allocate and write new labels in the "next" index
2/ Free the old labels in the working copy
3/ Write the bitmap and the label space on the dimm
4/ Write the index to make the update valid
Label ranges directly mirror the dpa resource values for the given
label_id of the namespace.
Cc: Greg KH <gregkh@linuxfoundation.org>
Cc: Neil Brown <neilb@suse.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
drivers/nvdimm/dimm_devs.c | 49 ++++++
drivers/nvdimm/label.c | 329 +++++++++++++++++++++++++++++++++++++++
drivers/nvdimm/label.h | 6 +
drivers/nvdimm/namespace_devs.c | 82 ++++++++--
drivers/nvdimm/nd.h | 3
5 files changed, 455 insertions(+), 14 deletions(-)
diff --git a/drivers/nvdimm/dimm_devs.c b/drivers/nvdimm/dimm_devs.c
index 2132195cb2ec..f6c4b1ab8073 100644
--- a/drivers/nvdimm/dimm_devs.c
+++ b/drivers/nvdimm/dimm_devs.c
@@ -132,6 +132,55 @@ int nvdimm_init_config_data(struct nvdimm_drvdata *ndd)
return rc;
}
+int nvdimm_set_config_data(struct nvdimm_drvdata *ndd, size_t offset,
+ void *buf, size_t len)
+{
+ int rc = validate_dimm(ndd);
+ size_t max_cmd_size, buf_offset;
+ struct nd_cmd_set_config_hdr *cmd;
+ struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(ndd->dev);
+ struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
+
+ if (rc)
+ return rc;
+
+ if (!ndd->data)
+ return -ENXIO;
+
+ if (offset + len > ndd->nsarea.config_size)
+ return -ENXIO;
+
+ max_cmd_size = min_t(u32, PAGE_SIZE, len);
+ max_cmd_size = min_t(u32, max_cmd_size, ndd->nsarea.max_xfer);
+ cmd = kzalloc(max_cmd_size + sizeof(*cmd) + sizeof(u32), GFP_KERNEL);
+ if (!cmd)
+ return -ENOMEM;
+
+ for (buf_offset = 0; len; len -= cmd->in_length,
+ buf_offset += cmd->in_length) {
+ size_t cmd_size;
+ u32 *status;
+
+ cmd->in_offset = offset + buf_offset;
+ cmd->in_length = min(max_cmd_size, len);
+ memcpy(cmd->in_buf, buf + buf_offset, cmd->in_length);
+
+ /* status is output in the last 4-bytes of the command buffer */
+ cmd_size = sizeof(*cmd) + cmd->in_length + sizeof(u32);
+ status = ((void *) cmd) + cmd_size - sizeof(u32);
+
+ rc = nd_desc->ndctl(nd_desc, to_nvdimm(ndd->dev),
+ ND_CMD_SET_CONFIG_DATA, cmd, cmd_size);
+ if (rc || *status) {
+ rc = rc ? rc : -ENXIO;
+ break;
+ }
+ }
+ kfree(cmd);
+
+ return rc;
+}
+
static void nvdimm_release(struct device *dev)
{
struct nvdimm *nvdimm = to_nvdimm(dev);
diff --git a/drivers/nvdimm/label.c b/drivers/nvdimm/label.c
index 66bafecc2419..8176bc5d645e 100644
--- a/drivers/nvdimm/label.c
+++ b/drivers/nvdimm/label.c
@@ -12,6 +12,7 @@
*/
#include <linux/device.h>
#include <linux/ndctl.h>
+#include <linux/slab.h>
#include <linux/io.h>
#include <linux/nd.h>
#include "nd-private.h"
@@ -61,6 +62,11 @@ size_t sizeof_namespace_index(struct nvdimm_drvdata *ndd)
return ndd->nsindex_size;
}
+static int nvdimm_num_label_slots(struct nvdimm_drvdata *ndd)
+{
+ return ndd->nsarea.config_size / 129;
+}
+
int nd_label_validate(struct nvdimm_drvdata *ndd)
{
/*
@@ -203,25 +209,32 @@ static struct nd_namespace_label __iomem *nd_label_base(struct nvdimm_drvdata *n
return base + 2 * sizeof_namespace_index(ndd);
}
+static int to_slot(struct nvdimm_drvdata *ndd,
+ struct nd_namespace_label __iomem *nd_label)
+{
+ return nd_label - nd_label_base(ndd);
+}
+
#define for_each_clear_bit_le(bit, addr, size) \
for ((bit) = find_next_zero_bit_le((addr), (size), 0); \
(bit) < (size); \
(bit) = find_next_zero_bit_le((addr), (size), (bit) + 1))
/**
- * preamble_current - common variable initialization for nd_label_* routines
+ * preamble_index - common variable initialization for nd_label_* routines
* @ndd: dimm container for the relevant label set
+ * @idx: namespace_index index
* @nsindex_out: on return set to the currently active namespace index
* @free: on return set to the free label bitmap in the index
* @nslot: on return set to the number of slots in the label space
*/
-static bool preamble_current(struct nvdimm_drvdata *ndd,
+static bool preamble_index(struct nvdimm_drvdata *ndd, int idx,
struct nd_namespace_index __iomem **nsindex_out,
unsigned long **free, u32 *nslot)
{
struct nd_namespace_index __iomem *nsindex;
- nsindex = to_current_namespace_index(ndd);
+ nsindex = to_namespace_index(ndd, idx);
if (nsindex == NULL)
return false;
@@ -241,6 +254,22 @@ char *nd_label_gen_id(struct nd_label_id *label_id, u8 *uuid, u32 flags)
return label_id->id;
}
+static bool preamble_current(struct nvdimm_drvdata *ndd,
+ struct nd_namespace_index __iomem **nsindex,
+ unsigned long **free, u32 *nslot)
+{
+ return preamble_index(ndd, ndd->ns_current, nsindex,
+ free, nslot);
+}
+
+static bool preamble_next(struct nvdimm_drvdata *ndd,
+ struct nd_namespace_index __iomem **nsindex,
+ unsigned long **free, u32 *nslot)
+{
+ return preamble_index(ndd, ndd->ns_next, nsindex,
+ free, nslot);
+}
+
static bool slot_valid(struct nd_namespace_label __iomem *nd_label, u32 slot)
{
/* check that we are written where we expect to be written */
@@ -340,3 +369,297 @@ struct nd_namespace_label __iomem *nd_label_active(
return NULL;
}
+
+u32 nd_label_alloc_slot(struct nvdimm_drvdata *ndd)
+{
+ struct nd_namespace_index __iomem *nsindex;
+ unsigned long *free;
+ u32 nslot, slot;
+
+ if (!preamble_next(ndd, &nsindex, &free, &nslot))
+ return UINT_MAX;
+
+ WARN_ON(!is_nvdimm_bus_locked(ndd->dev));
+
+ slot = find_next_bit_le(free, nslot, 0);
+ if (slot == nslot)
+ return UINT_MAX;
+
+ clear_bit_le(slot, free);
+
+ return slot;
+}
+
+bool nd_label_free_slot(struct nvdimm_drvdata *ndd, u32 slot)
+{
+ struct nd_namespace_index __iomem *nsindex;
+ unsigned long *free;
+ u32 nslot;
+
+ if (!preamble_next(ndd, &nsindex, &free, &nslot))
+ return false;
+
+ WARN_ON(!is_nvdimm_bus_locked(ndd->dev));
+
+ if (slot < nslot)
+ return !test_and_set_bit_le(slot, free);
+ return false;
+}
+
+u32 nd_label_nfree(struct nvdimm_drvdata *ndd)
+{
+ struct nd_namespace_index __iomem *nsindex;
+ unsigned long *free;
+ u32 nslot;
+
+ WARN_ON(!is_nvdimm_bus_locked(ndd->dev));
+
+ if (!preamble_next(ndd, &nsindex, &free, &nslot))
+ return 0;
+
+ return bitmap_weight(free, nslot);
+}
+
+static int nd_label_write_index(struct nvdimm_drvdata *ndd, int index, u32 seq,
+ unsigned long flags)
+{
+ struct nd_namespace_index __iomem *nsindex;
+ unsigned long offset;
+ u64 checksum;
+ u32 nslot;
+ int rc;
+
+ nsindex = to_namespace_index(ndd, index);
+ if (flags & ND_NSINDEX_INIT)
+ nslot = nvdimm_num_label_slots(ndd);
+ else
+ nslot = readl(&nsindex->nslot);
+
+ memcpy_toio(nsindex->sig, NSINDEX_SIGNATURE, NSINDEX_SIG_LEN);
+ writel(0, &nsindex->flags);
+ writel(seq, &nsindex->seq);
+ offset = (unsigned long) nsindex
+ - (unsigned long) to_namespace_index(ndd, 0);
+ writeq(offset, &nsindex->myoff);
+ writeq(sizeof_namespace_index(ndd), &nsindex->mysize);
+ offset = (unsigned long) to_namespace_index(ndd,
+ nd_label_next_nsindex(index))
+ - (unsigned long) to_namespace_index(ndd, 0);
+ writeq(offset, &nsindex->otheroff);
+ offset = (unsigned long) nd_label_base(ndd)
+ - (unsigned long) to_namespace_index(ndd, 0);
+ writeq(offset, &nsindex->labeloff);
+ writel(nslot, &nsindex->nslot);
+ writew(1, &nsindex->major);
+ writew(1, &nsindex->minor);
+ writeq(0, &nsindex->checksum);
+ if (flags & ND_NSINDEX_INIT) {
+ unsigned long *free = __io_virt(nsindex->free);
+ u32 nfree = ALIGN(nslot, BITS_PER_LONG);
+ int last_bits, i;
+
+ memset_io(nsindex->free, 0xff, nfree / 8);
+ for (i = 0, last_bits = nfree - nslot; i < last_bits; i++)
+ clear_bit_le(nslot + i, free);
+ }
+ checksum = nd_fletcher64(__io_virt(nsindex),
+ sizeof_namespace_index(ndd), 1);
+ writeq(checksum, &nsindex->checksum);
+ rc = nvdimm_set_config_data(ndd, readq(&nsindex->myoff),
+ __io_virt(nsindex), sizeof_namespace_index(ndd));
+ if (rc < 0)
+ return rc;
+
+ if (flags & ND_NSINDEX_INIT)
+ return 0;
+
+ /* copy the index we just wrote to the new 'next' */
+ WARN_ON(index != ndd->ns_next);
+ nd_label_copy(ndd, to_current_namespace_index(ndd), nsindex);
+ ndd->ns_current = nd_label_next_nsindex(ndd->ns_current);
+ ndd->ns_next = nd_label_next_nsindex(ndd->ns_next);
+ WARN_ON(ndd->ns_current == ndd->ns_next);
+
+ return 0;
+}
+
+static unsigned long nd_label_offset(struct nvdimm_drvdata *ndd,
+ struct nd_namespace_label __iomem *nd_label)
+{
+ return (unsigned long) nd_label
+ - (unsigned long) to_namespace_index(ndd, 0);
+}
+
+static int __pmem_label_update(struct nd_region *nd_region,
+ struct nd_mapping *nd_mapping, struct nd_namespace_pmem *nspm,
+ int pos)
+{
+ u64 cookie = nd_region_interleave_set_cookie(nd_region), rawsize;
+ struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
+ struct nd_namespace_label __iomem *victim_label;
+ struct nd_namespace_label __iomem *nd_label;
+ struct nd_namespace_index __iomem *nsindex;
+ unsigned long *free;
+ u32 nslot, slot;
+ size_t offset;
+ int rc;
+
+ if (!preamble_next(ndd, &nsindex, &free, &nslot))
+ return -ENXIO;
+
+ /* allocate and write the label to the staging (next) index */
+ slot = nd_label_alloc_slot(ndd);
+ if (slot == UINT_MAX)
+ return -ENXIO;
+ dev_dbg(ndd->dev, "%s: allocated: %d\n", __func__, slot);
+
+ nd_label = nd_label_base(ndd) + slot;
+ memset_io(nd_label, 0, sizeof(struct nd_namespace_label));
+ memcpy_toio(nd_label->uuid, nspm->uuid, NSLABEL_UUID_LEN);
+ if (nspm->alt_name)
+ memcpy_toio(nd_label->name, nspm->alt_name, NSLABEL_NAME_LEN);
+ writel(NSLABEL_FLAG_UPDATING, &nd_label->flags);
+ writew(nd_region->ndr_mappings, &nd_label->nlabel);
+ writew(pos, &nd_label->position);
+ writeq(cookie, &nd_label->isetcookie);
+ rawsize = div_u64(resource_size(&nspm->nsio.res),
+ nd_region->ndr_mappings);
+ writeq(rawsize, &nd_label->rawsize);
+ writeq(nd_mapping->start, &nd_label->dpa);
+ writel(slot, &nd_label->slot);
+
+ /* update label */
+ offset = nd_label_offset(ndd, nd_label);
+ rc = nvdimm_set_config_data(ndd, offset, __io_virt(nd_label),
+ sizeof(struct nd_namespace_label));
+ if (rc < 0)
+ return rc;
+
+ /* Garbage collect the previous label */
+ victim_label = nd_get_label(nd_mapping->labels, 0);
+ if (victim_label) {
+ slot = to_slot(ndd, victim_label);
+ nd_label_free_slot(ndd, slot);
+ dev_dbg(ndd->dev, "%s: free: %d\n", __func__, slot);
+ }
+
+ /* update index */
+ rc = nd_label_write_index(ndd, ndd->ns_next,
+ nd_inc_seq(readl(&nsindex->seq)), 0);
+ if (rc < 0)
+ return rc;
+
+ nd_set_label(nd_mapping->labels, nd_label, 0);
+
+ return 0;
+}
+
+static int init_labels(struct nd_mapping *nd_mapping)
+{
+ int i;
+ struct nd_namespace_index __iomem *nsindex;
+ struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
+
+ if (!nd_mapping->labels)
+ nd_mapping->labels = kcalloc(2, sizeof(void *), GFP_KERNEL);
+
+ if (!nd_mapping->labels)
+ return -ENOMEM;
+
+ if (ndd->ns_current == -1 || ndd->ns_next == -1)
+ /* pass */;
+ else
+ return 0;
+
+ nsindex = to_namespace_index(ndd, 0);
+ memset_io(nsindex, 0, ndd->nsarea.config_size);
+ for (i = 0; i < 2; i++) {
+ int rc = nd_label_write_index(ndd, i, i*2, ND_NSINDEX_INIT);
+
+ if (rc)
+ return rc;
+ }
+ ndd->ns_next = 1;
+ ndd->ns_current = 0;
+
+ return 0;
+}
+
+static int del_labels(struct nd_mapping *nd_mapping, u8 *uuid)
+{
+ struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
+ struct nd_namespace_label __iomem *nd_label;
+ struct nd_namespace_index __iomem *nsindex;
+ u8 label_uuid[NSLABEL_UUID_LEN];
+ int l, num_freed = 0;
+ unsigned long *free;
+ u32 nslot, slot;
+
+ if (!uuid)
+ return 0;
+
+ /* no index || no labels == nothing to delete */
+ if (!preamble_next(ndd, &nsindex, &free, &nslot)
+ || !nd_mapping->labels)
+ return 0;
+
+ for_each_label(l, nd_label, nd_mapping->labels) {
+ int j;
+
+ memcpy_fromio(label_uuid, nd_label->uuid, NSLABEL_UUID_LEN);
+ if (memcmp(label_uuid, uuid, NSLABEL_UUID_LEN) != 0)
+ continue;
+ slot = to_slot(ndd, nd_label);
+ nd_label_free_slot(ndd, slot);
+ dev_dbg(ndd->dev, "%s: free: %d\n", __func__, slot);
+ for (j = l; nd_get_label(nd_mapping->labels, j + 1); j++) {
+ struct nd_namespace_label __iomem *next_label;
+
+ next_label = nd_get_label(nd_mapping->labels, j + 1);
+ nd_set_label(nd_mapping->labels, next_label, j);
+ }
+ nd_set_label(nd_mapping->labels, NULL, j);
+ num_freed++;
+ }
+
+ if (num_freed > l) {
+ /*
+ * num_freed will only ever be > l when we delete the last
+ * label
+ */
+ kfree(nd_mapping->labels);
+ nd_mapping->labels = NULL;
+ dev_dbg(ndd->dev, "%s: no more labels\n", __func__);
+ }
+
+ return nd_label_write_index(ndd, ndd->ns_next,
+ nd_inc_seq(readl(&nsindex->seq)), 0);
+}
+
+int nd_pmem_namespace_label_update(struct nd_region *nd_region,
+ struct nd_namespace_pmem *nspm, resource_size_t size)
+{
+ int i;
+
+ for (i = 0; i < nd_region->ndr_mappings; i++) {
+ struct nd_mapping *nd_mapping = &nd_region->mapping[i];
+ int rc;
+
+ if (size == 0) {
+ rc = del_labels(nd_mapping, nspm->uuid);
+ if (rc)
+ return rc;
+ continue;
+ }
+
+ rc = init_labels(nd_mapping);
+ if (rc)
+ return rc;
+
+ rc = __pmem_label_update(nd_region, nd_mapping, nspm, i);
+ if (rc)
+ return rc;
+ }
+
+ return 0;
+}
diff --git a/drivers/nvdimm/label.h b/drivers/nvdimm/label.h
index 7d4a43d16871..91273b257028 100644
--- a/drivers/nvdimm/label.h
+++ b/drivers/nvdimm/label.h
@@ -34,6 +34,7 @@ enum {
BTTINFO_MAJOR_VERSION = 1,
ND_LABEL_MIN_SIZE = 512 * 129, /* see sizeof_namespace_index() */
ND_LABEL_ID_SIZE = 50,
+ ND_NSINDEX_INIT = 0x1,
};
static const char NSINDEX_SIGNATURE[] = "NAMESPACE_INDEX\0";
@@ -129,4 +130,9 @@ size_t sizeof_namespace_index(struct nvdimm_drvdata *ndd);
int nd_label_active_count(struct nvdimm_drvdata *ndd);
struct nd_namespace_label __iomem *nd_label_active(
struct nvdimm_drvdata *ndd, int n);
+u32 nd_label_nfree(struct nvdimm_drvdata *ndd);
+struct nd_region;
+struct nd_namespace_pmem;
+int nd_pmem_namespace_label_update(struct nd_region *nd_region,
+ struct nd_namespace_pmem *nspm, resource_size_t size);
#endif /* __LABEL_H__ */
diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c
index 6a3856b35d7a..32ad1c34e06d 100644
--- a/drivers/nvdimm/namespace_devs.c
+++ b/drivers/nvdimm/namespace_devs.c
@@ -151,20 +151,52 @@ static resource_size_t nd_namespace_blk_size(struct nd_namespace_blk *nsblk)
return size;
}
+static int nd_namespace_label_update(struct nd_region *nd_region, struct device *dev)
+{
+ dev_WARN_ONCE(dev, dev->driver,
+ "namespace must be idle during label update\n");
+ if (dev->driver)
+ return 0;
+
+ /*
+ * Only allow label writes that will result in a valid namespace
+ * or deletion of an existing namespace.
+ */
+ if (is_namespace_pmem(dev)) {
+ struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
+ struct resource *res = &nspm->nsio.res;
+ resource_size_t size = resource_size(res);
+
+ if (size == 0 && nspm->uuid)
+ /* delete allocation */;
+ else if (!nspm->uuid)
+ return 0;
+
+ return nd_pmem_namespace_label_update(nd_region, nspm, size);
+ } else if (is_namespace_blk(dev)) {
+ /* TODO: implement blk labels */
+ return 0;
+ } else
+ return -ENXIO;
+}
+
static ssize_t alt_name_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t len)
{
+ struct nd_region *nd_region = to_nd_region(dev->parent);
ssize_t rc;
device_lock(dev);
nvdimm_bus_lock(dev);
wait_nvdimm_bus_probe_idle(dev);
rc = __alt_name_store(dev, buf, len);
+ if (rc >= 0)
+ rc = nd_namespace_label_update(nd_region, dev);
dev_dbg(dev, "%s: %s (%zd)\n", __func__, rc < 0 ? "fail" : "success", rc);
nvdimm_bus_unlock(dev);
device_unlock(dev);
- return rc;
+ return rc < 0 ? rc : len;
}
static ssize_t alt_name_show(struct device *dev,
@@ -707,6 +739,7 @@ static ssize_t __size_store(struct device *dev, unsigned long long val)
static ssize_t size_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t len)
{
+ struct nd_region *nd_region = to_nd_region(dev->parent);
unsigned long long val;
u8 **uuid = NULL;
int rc;
@@ -719,6 +752,8 @@ static ssize_t size_store(struct device *dev,
nvdimm_bus_lock(dev);
wait_nvdimm_bus_probe_idle(dev);
rc = __size_store(dev, val);
+ if (rc >= 0)
+ rc = nd_namespace_label_update(nd_region, dev);
if (is_namespace_pmem(dev)) {
struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
@@ -742,7 +777,7 @@ static ssize_t size_store(struct device *dev,
nvdimm_bus_unlock(dev);
device_unlock(dev);
- return rc ? rc : len;
+ return rc < 0 ? rc : len;
}
static ssize_t size_show(struct device *dev,
@@ -802,17 +837,34 @@ static int namespace_update_uuid(struct nd_region *nd_region,
u32 flags = is_namespace_blk(dev) ? NSLABEL_FLAG_LOCAL : 0;
struct nd_label_id old_label_id;
struct nd_label_id new_label_id;
- int i, rc;
+ int i;
- rc = nd_is_uuid_unique(dev, new_uuid) ? 0 : -EINVAL;
- if (rc) {
- kfree(new_uuid);
- return rc;
- }
+ if (!nd_is_uuid_unique(dev, new_uuid))
+ return -EINVAL;
if (*old_uuid == NULL)
goto out;
+ /*
+ * If we've already written a label with this uuid, then it's
+ * too late to rename because we can't reliably update the uuid
+ * without losing the old namespace. Userspace must delete this
+ * namespace to abandon the old uuid.
+ */
+ for (i = 0; i < nd_region->ndr_mappings; i++) {
+ struct nd_mapping *nd_mapping = &nd_region->mapping[i];
+
+ /*
+ * This check by itself is sufficient because old_uuid
+ * would be NULL above if this uuid did not exist in the
+ * currently written set.
+ *
+ * FIXME: can we delete uuid with zero dpa allocated?
+ */
+ if (nd_mapping->labels)
+ return -EBUSY;
+ }
+
nd_label_gen_id(&old_label_id, *old_uuid, flags);
nd_label_gen_id(&new_label_id, new_uuid, flags);
for (i = 0; i < nd_region->ndr_mappings; i++) {
@@ -856,12 +908,16 @@ static ssize_t uuid_store(struct device *dev,
rc = nd_uuid_store(dev, &uuid, buf, len);
if (rc >= 0)
rc = namespace_update_uuid(nd_region, dev, uuid, ns_uuid);
+ if (rc >= 0)
+ rc = nd_namespace_label_update(nd_region, dev);
+ else
+ kfree(uuid);
dev_dbg(dev, "%s: result: %zd wrote: %s%s", __func__,
rc, buf, buf[len - 1] == '\n' ? "" : "\n");
nvdimm_bus_unlock(dev);
device_unlock(dev);
- return rc ? rc : len;
+ return rc < 0 ? rc : len;
}
static DEVICE_ATTR_RW(uuid);
@@ -905,6 +961,7 @@ static ssize_t sector_size_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t len)
{
struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
+ struct nd_region *nd_region = to_nd_region(dev->parent);
ssize_t rc;
if (!is_namespace_blk(dev))
@@ -914,8 +971,11 @@ static ssize_t sector_size_store(struct device *dev,
nvdimm_bus_lock(dev);
rc = nd_sector_size_store(dev, buf, &nsblk->lbasize,
ns_lbasize_supported);
- dev_dbg(dev, "%s: result: %zd wrote: %s%s", __func__,
- rc, buf, buf[len - 1] == '\n' ? "" : "\n");
+ if (rc >= 0)
+ rc = nd_namespace_label_update(nd_region, dev);
+ dev_dbg(dev, "%s: result: %zd %s: %s%s", __func__,
+ rc, rc < 0 ? "tried" : "wrote", buf,
+ buf[len - 1] == '\n' ? "" : "\n");
nvdimm_bus_unlock(dev);
device_unlock(dev);
diff --git a/drivers/nvdimm/nd.h b/drivers/nvdimm/nd.h
index 7422cf35c067..c3ffb5174e8f 100644
--- a/drivers/nvdimm/nd.h
+++ b/drivers/nvdimm/nd.h
@@ -110,6 +110,7 @@ static inline unsigned nd_inc_seq(unsigned seq)
return next[seq & 3];
}
+
enum nd_async_mode {
ND_SYNC,
ND_ASYNC,
@@ -132,6 +133,8 @@ struct nvdimm;
struct nvdimm_drvdata *to_ndd(struct nd_mapping *nd_mapping);
int nvdimm_init_nsarea(struct nvdimm_drvdata *ndd);
int nvdimm_init_config_data(struct nvdimm_drvdata *ndd);
+int nvdimm_set_config_data(struct nvdimm_drvdata *ndd, size_t offset,
+ void *buf, size_t len);
struct nd_region *to_nd_region(struct device *dev);
int nd_region_to_namespace_type(struct nd_region *nd_region);
int nd_region_register_namespaces(struct nd_region *nd_region, int *err);
^ permalink raw reply related [flat|nested] 47+ messages in thread
* [PATCH v5 16/21] libnvdimm: write blk label set
2015-06-02 0:14 [PATCH v5 00/21] libnvdimm: non-volatile memory devices Dan Williams
` (14 preceding siblings ...)
2015-06-02 0:15 ` [PATCH v5 15/21] libnvdimm: write pmem label set Dan Williams
@ 2015-06-02 0:15 ` Dan Williams
2015-06-02 0:15 ` [PATCH v5 17/21] libnvdimm: infrastructure for btt devices Dan Williams
` (4 subsequent siblings)
20 siblings, 0 replies; 47+ messages in thread
From: Dan Williams @ 2015-06-02 0:15 UTC (permalink / raw)
To: linux-nvdimm
Cc: axboe, sfr, rafael, neilb, gregkh, linux-kernel, mingo,
linux-acpi, jmoyer, linux-api, akpm, hch
After 'uuid', 'size', 'sector_size', and optionally 'alt_name' have been
set to valid values the labels on the dimm can be updated. The
difference with the pmem case is that blk namespaces are limited to one
dimm and can cover discontiguous ranges in dpa space.
Also, after allocating label slots, it is useful for userspace to know
how many slots are left. Export this information in sysfs.
Cc: Greg KH <gregkh@linuxfoundation.org>
Cc: Neil Brown <neilb@suse.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
drivers/nvdimm/bus.c | 4 +
drivers/nvdimm/dimm_devs.c | 25 +++
drivers/nvdimm/label.c | 297 +++++++++++++++++++++++++++++++++++++--
drivers/nvdimm/label.h | 5 +
drivers/nvdimm/namespace_devs.c | 57 +++++++
drivers/nvdimm/nd-private.h | 1
6 files changed, 367 insertions(+), 22 deletions(-)
diff --git a/drivers/nvdimm/bus.c b/drivers/nvdimm/bus.c
index 95c11e622daa..fbf21dbd80fa 100644
--- a/drivers/nvdimm/bus.c
+++ b/drivers/nvdimm/bus.c
@@ -136,6 +136,10 @@ static void nd_async_device_unregister(void *d, async_cookie_t cookie)
{
struct device *dev = d;
+ /* flush bus operations before delete */
+ nvdimm_bus_lock(dev);
+ nvdimm_bus_unlock(dev);
+
device_unregister(dev);
put_device(dev);
}
diff --git a/drivers/nvdimm/dimm_devs.c b/drivers/nvdimm/dimm_devs.c
index f6c4b1ab8073..38fb68af5ef9 100644
--- a/drivers/nvdimm/dimm_devs.c
+++ b/drivers/nvdimm/dimm_devs.c
@@ -19,6 +19,7 @@
#include <linux/fs.h>
#include <linux/mm.h>
#include "nd-private.h"
+#include "label.h"
#include "nd.h"
static DEFINE_IDA(dimm_ida);
@@ -262,9 +263,33 @@ static ssize_t state_show(struct device *dev, struct device_attribute *attr,
}
static DEVICE_ATTR_RO(state);
+static ssize_t available_slots_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct nvdimm_drvdata *ndd = dev_get_drvdata(dev);
+ ssize_t rc;
+ u32 nfree;
+
+ if (!ndd)
+ return -ENXIO;
+
+ nvdimm_bus_lock(dev);
+ nfree = nd_label_nfree(ndd);
+ if (nfree - 1 > nfree) {
+ dev_WARN_ONCE(dev, 1, "we ate our last label?\n");
+ nfree = 0;
+ } else
+ nfree--;
+ rc = sprintf(buf, "%d\n", nfree);
+ nvdimm_bus_unlock(dev);
+ return rc;
+}
+static DEVICE_ATTR_RO(available_slots);
+
static struct attribute *nvdimm_attributes[] = {
&dev_attr_state.attr,
&dev_attr_commands.attr,
+ &dev_attr_available_slots.attr,
NULL,
};
diff --git a/drivers/nvdimm/label.c b/drivers/nvdimm/label.c
index 8176bc5d645e..6f67db5a3302 100644
--- a/drivers/nvdimm/label.c
+++ b/drivers/nvdimm/label.c
@@ -62,7 +62,7 @@ size_t sizeof_namespace_index(struct nvdimm_drvdata *ndd)
return ndd->nsindex_size;
}
-static int nvdimm_num_label_slots(struct nvdimm_drvdata *ndd)
+int nvdimm_num_label_slots(struct nvdimm_drvdata *ndd)
{
return ndd->nsarea.config_size / 129;
}
@@ -415,7 +415,7 @@ u32 nd_label_nfree(struct nvdimm_drvdata *ndd)
WARN_ON(!is_nvdimm_bus_locked(ndd->dev));
if (!preamble_next(ndd, &nsindex, &free, &nslot))
- return 0;
+ return nvdimm_num_label_slots(ndd);
return bitmap_weight(free, nslot);
}
@@ -554,22 +554,270 @@ static int __pmem_label_update(struct nd_region *nd_region,
return 0;
}
-static int init_labels(struct nd_mapping *nd_mapping)
+static void del_label(struct nd_mapping *nd_mapping, int l)
+{
+ struct nd_namespace_label __iomem *next_label, *nd_label;
+ struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
+ unsigned int slot;
+ int j;
+
+ nd_label = nd_get_label(nd_mapping->labels, l);
+ slot = to_slot(ndd, nd_label);
+ dev_vdbg(ndd->dev, "%s: clear: %d\n", __func__, slot);
+
+ for (j = l; (next_label = nd_get_label(nd_mapping->labels, j + 1)); j++)
+ nd_set_label(nd_mapping->labels, next_label, j);
+ nd_set_label(nd_mapping->labels, NULL, j);
+}
+
+static bool is_old_resource(struct resource *res, struct resource **list, int n)
{
int i;
+
+ if (res->flags & DPA_RESOURCE_ADJUSTED)
+ return false;
+ for (i = 0; i < n; i++)
+ if (res == list[i])
+ return true;
+ return false;
+}
+
+static struct resource *to_resource(struct nvdimm_drvdata *ndd,
+ struct nd_namespace_label __iomem *nd_label)
+{
+ struct resource *res;
+
+ for_each_dpa_resource(ndd, res) {
+ if (res->start != readq(&nd_label->dpa))
+ continue;
+ if (resource_size(res) != readq(&nd_label->rawsize))
+ continue;
+ return res;
+ }
+
+ return NULL;
+}
+
+/*
+ * 1/ Account all the labels that can be freed after this update
+ * 2/ Allocate and write the label to the staging (next) index
+ * 3/ Record the resources in the namespace device
+ */
+static int __blk_label_update(struct nd_region *nd_region,
+ struct nd_mapping *nd_mapping, struct nd_namespace_blk *nsblk,
+ int num_labels)
+{
+ int i, l, alloc, victims, nfree, old_num_resources, nlabel, rc = -ENXIO;
+ struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
+ struct nd_namespace_label __iomem *nd_label;
+ struct nd_namespace_index __iomem *nsindex;
+ unsigned long *free, *victim_map = NULL;
+ struct resource *res, **old_res_list;
+ struct nd_label_id label_id;
+ u8 uuid[NSLABEL_UUID_LEN];
+ u32 nslot, slot;
+
+ if (!preamble_next(ndd, &nsindex, &free, &nslot))
+ return -ENXIO;
+
+ old_res_list = nsblk->res;
+ nfree = nd_label_nfree(ndd);
+ old_num_resources = nsblk->num_resources;
+ nd_label_gen_id(&label_id, nsblk->uuid, NSLABEL_FLAG_LOCAL);
+
+ /*
+ * We need to loop over the old resources a few times, which seems a
+ * bit inefficient, but we need to know that we have the label
+ * space before we start mutating the tracking structures.
+ * Otherwise the recovery method of last resort for userspace is
+ * disable and re-enable the parent region.
+ */
+ alloc = 0;
+ for_each_dpa_resource(ndd, res) {
+ if (strcmp(res->name, label_id.id) != 0)
+ continue;
+ if (!is_old_resource(res, old_res_list, old_num_resources))
+ alloc++;
+ }
+
+ victims = 0;
+ if (old_num_resources) {
+ /* convert old local-label-map to dimm-slot victim-map */
+ victim_map = kcalloc(BITS_TO_LONGS(nslot), sizeof(long),
+ GFP_KERNEL);
+ if (!victim_map)
+ return -ENOMEM;
+
+ /* mark unused labels for garbage collection */
+ for_each_clear_bit_le(slot, free, nslot) {
+ nd_label = nd_label_base(ndd) + slot;
+ memcpy_fromio(uuid, nd_label->uuid, NSLABEL_UUID_LEN);
+ if (memcmp(uuid, nsblk->uuid, NSLABEL_UUID_LEN) != 0)
+ continue;
+ res = to_resource(ndd, nd_label);
+ if (res && is_old_resource(res, old_res_list,
+ old_num_resources))
+ continue;
+ slot = to_slot(ndd, nd_label);
+ set_bit(slot, victim_map);
+ victims++;
+ }
+ }
+
+ /* don't allow updates that consume the last label */
+ if (nfree - alloc < 0 || nfree - alloc + victims < 1) {
+ dev_info(&nsblk->dev, "insufficient label space\n");
+ kfree(victim_map);
+ return -ENOSPC;
+ }
+ /* from here on we need to abort on error */
+
+
+ /* assign all resources to the namespace before writing the labels */
+ nsblk->res = NULL;
+ nsblk->num_resources = 0;
+ for_each_dpa_resource(ndd, res) {
+ if (strcmp(res->name, label_id.id) != 0)
+ continue;
+ if (!nsblk_add_resource(nd_region, ndd, nsblk, res->start)) {
+ rc = -ENOMEM;
+ goto abort;
+ }
+ }
+
+ for (i = 0; i < nsblk->num_resources; i++) {
+ size_t offset;
+
+ res = nsblk->res[i];
+ if (is_old_resource(res, old_res_list, old_num_resources))
+ continue; /* carry-over */
+ slot = nd_label_alloc_slot(ndd);
+ if (slot == UINT_MAX)
+ goto abort;
+ dev_dbg(ndd->dev, "%s: allocated: %d\n", __func__, slot);
+
+ nd_label = nd_label_base(ndd) + slot;
+ memset_io(nd_label, 0, sizeof(struct nd_namespace_label));
+ memcpy_toio(nd_label->uuid, nsblk->uuid, NSLABEL_UUID_LEN);
+ if (nsblk->alt_name)
+ memcpy_toio(nd_label->name, nsblk->alt_name,
+ NSLABEL_NAME_LEN);
+ writel(NSLABEL_FLAG_LOCAL, &nd_label->flags);
+ writew(0, &nd_label->nlabel); /* N/A */
+ writew(0, &nd_label->position); /* N/A */
+ writeq(0, &nd_label->isetcookie); /* N/A */
+ writeq(res->start, &nd_label->dpa);
+ writeq(resource_size(res), &nd_label->rawsize);
+ writeq(nsblk->lbasize, &nd_label->lbasize);
+ writel(slot, &nd_label->slot);
+
+ /* update label */
+ offset = nd_label_offset(ndd, nd_label);
+ rc = nvdimm_set_config_data(ndd, offset, __io_virt(nd_label),
+ sizeof(struct nd_namespace_label));
+ if (rc < 0)
+ goto abort;
+ }
+
+ /* free up now unused slots in the new index */
+ for_each_set_bit(slot, victim_map, victim_map ? nslot : 0) {
+ dev_dbg(ndd->dev, "%s: free: %d\n", __func__, slot);
+ nd_label_free_slot(ndd, slot);
+ }
+
+ /* update index */
+ rc = nd_label_write_index(ndd, ndd->ns_next,
+ nd_inc_seq(readl(&nsindex->seq)), 0);
+ if (rc)
+ goto abort;
+
+ /*
+ * Now that the on-dimm labels are up to date, fix up the tracking
+ * entries in nd_mapping->labels
+ */
+ nlabel = 0;
+ for_each_label(l, nd_label, nd_mapping->labels) {
+ nlabel++;
+ memcpy_fromio(uuid, nd_label->uuid, NSLABEL_UUID_LEN);
+ if (memcmp(uuid, nsblk->uuid, NSLABEL_UUID_LEN) != 0)
+ continue;
+ nlabel--;
+ del_label(nd_mapping, l);
+ l--; /* retry with the new label at this index */
+ }
+ if (nlabel + nsblk->num_resources > num_labels) {
+ /*
+ * Bug, we can't end up with more resources than
+ * available labels
+ */
+ WARN_ON_ONCE(1);
+ rc = -ENXIO;
+ goto out;
+ }
+
+ for_each_clear_bit_le(slot, free, nslot) {
+ nd_label = nd_label_base(ndd) + slot;
+ memcpy_fromio(uuid, nd_label->uuid, NSLABEL_UUID_LEN);
+ if (memcmp(uuid, nsblk->uuid, NSLABEL_UUID_LEN) != 0)
+ continue;
+ res = to_resource(ndd, nd_label);
+ res->flags &= ~DPA_RESOURCE_ADJUSTED;
+ dev_vdbg(&nsblk->dev, "assign label[%d] slot: %d\n", l, slot);
+ nd_set_label(nd_mapping->labels, nd_label, l++);
+ }
+ nd_set_label(nd_mapping->labels, NULL, l);
+
+ out:
+ kfree(old_res_list);
+ kfree(victim_map);
+ return rc;
+
+ abort:
+ /*
+ * 1/ repair the allocated label bitmap in the index
+ * 2/ restore the resource list
+ */
+ nd_label_copy(ndd, nsindex, to_current_namespace_index(ndd));
+ kfree(nsblk->res);
+ nsblk->res = old_res_list;
+ nsblk->num_resources = old_num_resources;
+ old_res_list = NULL;
+ goto out;
+}
+
+static int init_labels(struct nd_mapping *nd_mapping, int num_labels)
+{
+ int i, l, old_num_labels = 0;
struct nd_namespace_index __iomem *nsindex;
+ struct nd_namespace_label __iomem *nd_label;
struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
+ size_t size = (num_labels + 1) * sizeof(struct nd_namespace_label *);
- if (!nd_mapping->labels)
- nd_mapping->labels = kcalloc(2, sizeof(void *), GFP_KERNEL);
+ for_each_label(l, nd_label, nd_mapping->labels)
+ old_num_labels++;
+ /*
+ * We need to preserve all the old labels for the mapping so
+ * they can be garbage collected after writing the new labels.
+ */
+ if (num_labels > old_num_labels) {
+ struct nd_namespace_label **labels;
+
+ labels = krealloc(nd_mapping->labels, size, GFP_KERNEL);
+ if (!labels)
+ return -ENOMEM;
+ nd_mapping->labels = labels;
+ }
if (!nd_mapping->labels)
return -ENOMEM;
+ for (i = old_num_labels; i <= num_labels; i++)
+ nd_set_label(nd_mapping->labels, NULL, i);
+
if (ndd->ns_current == -1 || ndd->ns_next == -1)
/* pass */;
else
- return 0;
+ return max(num_labels, old_num_labels);
nsindex = to_namespace_index(ndd, 0);
memset_io(nsindex, 0, ndd->nsarea.config_size);
@@ -582,7 +830,7 @@ static int init_labels(struct nd_mapping *nd_mapping)
ndd->ns_next = 1;
ndd->ns_current = 0;
- return 0;
+ return max(num_labels, old_num_labels);
}
static int del_labels(struct nd_mapping *nd_mapping, u8 *uuid)
@@ -604,22 +852,15 @@ static int del_labels(struct nd_mapping *nd_mapping, u8 *uuid)
return 0;
for_each_label(l, nd_label, nd_mapping->labels) {
- int j;
-
memcpy_fromio(label_uuid, nd_label->uuid, NSLABEL_UUID_LEN);
if (memcmp(label_uuid, uuid, NSLABEL_UUID_LEN) != 0)
continue;
slot = to_slot(ndd, nd_label);
nd_label_free_slot(ndd, slot);
dev_dbg(ndd->dev, "%s: free: %d\n", __func__, slot);
- for (j = l; nd_get_label(nd_mapping->labels, j + 1); j++) {
- struct nd_namespace_label __iomem *next_label;
-
- next_label = nd_get_label(nd_mapping->labels, j + 1);
- nd_set_label(nd_mapping->labels, next_label, j);
- }
- nd_set_label(nd_mapping->labels, NULL, j);
+ del_label(nd_mapping, l);
num_freed++;
+ l--; /* retry with new label at this index */
}
if (num_freed > l) {
@@ -652,8 +893,8 @@ int nd_pmem_namespace_label_update(struct nd_region *nd_region,
continue;
}
- rc = init_labels(nd_mapping);
- if (rc)
+ rc = init_labels(nd_mapping, 1);
+ if (rc < 0)
return rc;
rc = __pmem_label_update(nd_region, nd_mapping, nspm, i);
@@ -663,3 +904,23 @@ int nd_pmem_namespace_label_update(struct nd_region *nd_region,
return 0;
}
+
+int nd_blk_namespace_label_update(struct nd_region *nd_region,
+ struct nd_namespace_blk *nsblk, resource_size_t size)
+{
+ struct nd_mapping *nd_mapping = &nd_region->mapping[0];
+ struct resource *res;
+ int count = 0;
+
+ if (size == 0)
+ return del_labels(nd_mapping, nsblk->uuid);
+
+ for_each_dpa_resource(to_ndd(nd_mapping), res)
+ count++;
+
+ count = init_labels(nd_mapping, count);
+ if (count < 0)
+ return count;
+
+ return __blk_label_update(nd_region, nd_mapping, nsblk, count);
+}
diff --git a/drivers/nvdimm/label.h b/drivers/nvdimm/label.h
index 91273b257028..21e179bf926a 100644
--- a/drivers/nvdimm/label.h
+++ b/drivers/nvdimm/label.h
@@ -130,9 +130,14 @@ size_t sizeof_namespace_index(struct nvdimm_drvdata *ndd);
int nd_label_active_count(struct nvdimm_drvdata *ndd);
struct nd_namespace_label __iomem *nd_label_active(
struct nvdimm_drvdata *ndd, int n);
+u32 nd_label_alloc_slot(struct nvdimm_drvdata *ndd);
+bool nd_label_free_slot(struct nvdimm_drvdata *ndd, u32 slot);
u32 nd_label_nfree(struct nvdimm_drvdata *ndd);
struct nd_region;
struct nd_namespace_pmem;
+struct nd_namespace_blk;
int nd_pmem_namespace_label_update(struct nd_region *nd_region,
struct nd_namespace_pmem *nspm, resource_size_t size);
+int nd_blk_namespace_label_update(struct nd_region *nd_region,
+ struct nd_namespace_blk *nsblk, resource_size_t size);
#endif /* __LABEL_H__ */
diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c
index 32ad1c34e06d..893eefafb940 100644
--- a/drivers/nvdimm/namespace_devs.c
+++ b/drivers/nvdimm/namespace_devs.c
@@ -164,8 +164,7 @@ static int nd_namespace_label_update(struct nd_region *nd_region, struct device
*/
if (is_namespace_pmem(dev)) {
struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
- struct resource *res = &nspm->nsio.res;
- resource_size_t size = resource_size(res);
+ resource_size_t size = resource_size(&nspm->nsio.res);
if (size == 0 && nspm->uuid)
/* delete allocation */;
@@ -174,8 +173,15 @@ static int nd_namespace_label_update(struct nd_region *nd_region, struct device
return nd_pmem_namespace_label_update(nd_region, nspm, size);
} else if (is_namespace_blk(dev)) {
- /* TODO: implement blk labels */
- return 0;
+ struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
+ resource_size_t size = nd_namespace_blk_size(nsblk);
+
+ if (size == 0 && nsblk->uuid)
+ /* delete allocation */;
+ else if (!nsblk->uuid || !nsblk->lbasize)
+ return 0;
+
+ return nd_blk_namespace_label_update(nd_region, nsblk, size);
} else
return -ENXIO;
}
@@ -983,6 +989,48 @@ static ssize_t sector_size_store(struct device *dev,
}
static DEVICE_ATTR_RW(sector_size);
+static ssize_t dpa_extents_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct nd_region *nd_region = to_nd_region(dev->parent);
+ struct nd_label_id label_id;
+ int count = 0, i;
+ u8 *uuid = NULL;
+ u32 flags = 0;
+
+ nvdimm_bus_lock(dev);
+ if (is_namespace_pmem(dev)) {
+ struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
+
+ uuid = nspm->uuid;
+ flags = 0;
+ } else if (is_namespace_blk(dev)) {
+ struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
+
+ uuid = nsblk->uuid;
+ flags = NSLABEL_FLAG_LOCAL;
+ }
+
+ if (!uuid)
+ goto out;
+
+ nd_label_gen_id(&label_id, uuid, flags);
+ for (i = 0; i < nd_region->ndr_mappings; i++) {
+ struct nd_mapping *nd_mapping = &nd_region->mapping[i];
+ struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
+ struct resource *res;
+
+ for_each_dpa_resource(ndd, res)
+ if (strcmp(res->name, label_id.id) == 0)
+ count++;
+ }
+ out:
+ nvdimm_bus_unlock(dev);
+
+ return sprintf(buf, "%d\n", count);
+}
+static DEVICE_ATTR_RO(dpa_extents);
+
static struct attribute *nd_namespace_attributes[] = {
&dev_attr_nstype.attr,
&dev_attr_size.attr,
@@ -990,6 +1038,7 @@ static struct attribute *nd_namespace_attributes[] = {
&dev_attr_resource.attr,
&dev_attr_alt_name.attr,
&dev_attr_sector_size.attr,
+ &dev_attr_dpa_extents.attr,
NULL,
};
diff --git a/drivers/nvdimm/nd-private.h b/drivers/nvdimm/nd-private.h
index 0d39cc1ba084..b0eed3bcb76d 100644
--- a/drivers/nvdimm/nd-private.h
+++ b/drivers/nvdimm/nd-private.h
@@ -76,4 +76,5 @@ struct nd_mapping;
struct resource *nsblk_add_resource(struct nd_region *nd_region,
struct nvdimm_drvdata *ndd, struct nd_namespace_blk *nsblk,
resource_size_t start);
+int nvdimm_num_label_slots(struct nvdimm_drvdata *ndd);
#endif /* __ND_PRIVATE_H__ */
^ permalink raw reply related [flat|nested] 47+ messages in thread
* [PATCH v5 17/21] libnvdimm: infrastructure for btt devices
2015-06-02 0:14 [PATCH v5 00/21] libnvdimm: non-volatile memory devices Dan Williams
` (15 preceding siblings ...)
2015-06-02 0:15 ` [PATCH v5 16/21] libnvdimm: write blk " Dan Williams
@ 2015-06-02 0:15 ` Dan Williams
2015-06-09 6:42 ` Christoph Hellwig
2015-06-02 0:15 ` [PATCH v5 18/21] nd_btt: atomic sector updates Dan Williams
` (3 subsequent siblings)
20 siblings, 1 reply; 47+ messages in thread
From: Dan Williams @ 2015-06-02 0:15 UTC (permalink / raw)
To: linux-nvdimm
Cc: axboe, sfr, rafael, neilb, gregkh, linux-kernel, mingo,
linux-acpi, jmoyer, linux-api, akpm, hch
Block devices from an nd bus, in addition to accepting "struct bio"
based requests, also have the capability to perform byte-aligned
accesses. By default only the bio/block interface is used. However, if
another driver can make effective use of the byte-aligned capability it
can claim/disable the block interface and use the byte-aligned "nd_io"
interface.
The BTT driver is the initial first consumer of this mechanism to allow
layering atomic sector update guarantees on top of nd_io capable
libnvdimm-block-devices, or their partitions.
Cc: Greg KH <gregkh@linuxfoundation.org>
Cc: Neil Brown <neilb@suse.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
drivers/nvdimm/Kconfig | 3
drivers/nvdimm/Makefile | 1
drivers/nvdimm/btt.h | 45 ++++
drivers/nvdimm/btt_devs.c | 442 +++++++++++++++++++++++++++++++++++++++++++
drivers/nvdimm/bus.c | 128 ++++++++++++
drivers/nvdimm/core.c | 79 ++++++++
drivers/nvdimm/nd-private.h | 28 +++
drivers/nvdimm/nd.h | 94 +++++++++
drivers/nvdimm/pmem.c | 29 +++
include/uapi/linux/ndctl.h | 2
10 files changed, 847 insertions(+), 4 deletions(-)
create mode 100644 drivers/nvdimm/btt.h
create mode 100644 drivers/nvdimm/btt_devs.c
diff --git a/drivers/nvdimm/Kconfig b/drivers/nvdimm/Kconfig
index 020acf860258..564c8c9b2af6 100644
--- a/drivers/nvdimm/Kconfig
+++ b/drivers/nvdimm/Kconfig
@@ -34,4 +34,7 @@ config BLK_DEV_PMEM
Say Y if you want to use a NVDIMM described by NFIT
+config ND_BTT_DEVS
+ def_bool y
+
endif
diff --git a/drivers/nvdimm/Makefile b/drivers/nvdimm/Makefile
index abce98f87f16..eb1bbce86592 100644
--- a/drivers/nvdimm/Makefile
+++ b/drivers/nvdimm/Makefile
@@ -11,3 +11,4 @@ libnvdimm-y += region_devs.o
libnvdimm-y += region.o
libnvdimm-y += namespace_devs.o
libnvdimm-y += label.o
+libnvdimm-$(CONFIG_ND_BTT_DEVS) += btt_devs.o
diff --git a/drivers/nvdimm/btt.h b/drivers/nvdimm/btt.h
new file mode 100644
index 000000000000..e8f6d8e0ddd3
--- /dev/null
+++ b/drivers/nvdimm/btt.h
@@ -0,0 +1,45 @@
+/*
+ * Block Translation Table library
+ * Copyright (c) 2014-2015, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ */
+
+#ifndef _LINUX_BTT_H
+#define _LINUX_BTT_H
+
+#include <linux/types.h>
+
+#define BTT_SIG_LEN 16
+#define BTT_SIG "BTT_ARENA_INFO\0"
+
+struct btt_sb {
+ u8 signature[BTT_SIG_LEN];
+ u8 uuid[16];
+ u8 parent_uuid[16];
+ __le32 flags;
+ __le16 version_major;
+ __le16 version_minor;
+ __le32 external_lbasize;
+ __le32 external_nlba;
+ __le32 internal_lbasize;
+ __le32 internal_nlba;
+ __le32 nfree;
+ __le32 infosize;
+ __le64 nextoff;
+ __le64 dataoff;
+ __le64 mapoff;
+ __le64 logoff;
+ __le64 info2off;
+ u8 padding[3968];
+ __le64 checksum;
+};
+
+#endif
diff --git a/drivers/nvdimm/btt_devs.c b/drivers/nvdimm/btt_devs.c
new file mode 100644
index 000000000000..f288ed7c490f
--- /dev/null
+++ b/drivers/nvdimm/btt_devs.c
@@ -0,0 +1,442 @@
+/*
+ * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ */
+#include <linux/device.h>
+#include <linux/genhd.h>
+#include <linux/sizes.h>
+#include <linux/slab.h>
+#include <linux/fs.h>
+#include <linux/mm.h>
+#include "nd-private.h"
+#include "btt.h"
+#include "nd.h"
+
+static DEFINE_IDA(btt_ida);
+
+static void nd_btt_release(struct device *dev)
+{
+ struct nd_btt *nd_btt = to_nd_btt(dev);
+
+ dev_dbg(dev, "%s\n", __func__);
+ WARN_ON(nd_btt->backing_dev);
+ ndio_del_claim(nd_btt->ndio_claim);
+ ida_simple_remove(&btt_ida, nd_btt->id);
+ kfree(nd_btt->uuid);
+ kfree(nd_btt);
+}
+
+static struct device_type nd_btt_device_type = {
+ .name = "nd_btt",
+ .release = nd_btt_release,
+};
+
+bool is_nd_btt(struct device *dev)
+{
+ return dev->type == &nd_btt_device_type;
+}
+
+struct nd_btt *to_nd_btt(struct device *dev)
+{
+ struct nd_btt *nd_btt = container_of(dev, struct nd_btt, dev);
+
+ WARN_ON(!is_nd_btt(dev));
+ return nd_btt;
+}
+EXPORT_SYMBOL(to_nd_btt);
+
+static const unsigned long btt_lbasize_supported[] = { 512, 4096, 0 };
+
+static ssize_t sector_size_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct nd_btt *nd_btt = to_nd_btt(dev);
+
+ return nd_sector_size_show(nd_btt->lbasize, btt_lbasize_supported, buf);
+}
+
+static ssize_t sector_size_store(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t len)
+{
+ struct nd_btt *nd_btt = to_nd_btt(dev);
+ ssize_t rc;
+
+ device_lock(dev);
+ nvdimm_bus_lock(dev);
+ rc = nd_sector_size_store(dev, buf, &nd_btt->lbasize,
+ btt_lbasize_supported);
+ dev_dbg(dev, "%s: result: %zd wrote: %s%s", __func__,
+ rc, buf, buf[len - 1] == '\n' ? "" : "\n");
+ nvdimm_bus_unlock(dev);
+ device_unlock(dev);
+
+ return rc ? rc : len;
+}
+static DEVICE_ATTR_RW(sector_size);
+
+static ssize_t uuid_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct nd_btt *nd_btt = to_nd_btt(dev);
+
+ if (nd_btt->uuid)
+ return sprintf(buf, "%pUb\n", nd_btt->uuid);
+ return sprintf(buf, "\n");
+}
+
+static ssize_t uuid_store(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t len)
+{
+ struct nd_btt *nd_btt = to_nd_btt(dev);
+ ssize_t rc;
+
+ device_lock(dev);
+ rc = nd_uuid_store(dev, &nd_btt->uuid, buf, len);
+ dev_dbg(dev, "%s: result: %zd wrote: %s%s", __func__,
+ rc, buf, buf[len - 1] == '\n' ? "" : "\n");
+ device_unlock(dev);
+
+ return rc ? rc : len;
+}
+static DEVICE_ATTR_RW(uuid);
+
+static ssize_t backing_dev_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct nd_btt *nd_btt = to_nd_btt(dev);
+ char name[BDEVNAME_SIZE];
+
+ if (nd_btt->backing_dev)
+ return sprintf(buf, "/dev/%s\n",
+ bdevname(nd_btt->backing_dev, name));
+ else
+ return sprintf(buf, "\n");
+}
+
+static const fmode_t nd_btt_devs_mode = FMODE_READ | FMODE_WRITE | FMODE_EXCL;
+
+static void nd_btt_ndio_notify_remove(struct nd_io_claim *ndio_claim)
+{
+ char bdev_name[BDEVNAME_SIZE];
+ struct nd_btt *nd_btt;
+
+ if (!ndio_claim || !ndio_claim->holder)
+ return;
+
+ nd_btt = to_nd_btt(ndio_claim->holder);
+ WARN_ON_ONCE(!is_nvdimm_bus_locked(&nd_btt->dev));
+ dev_dbg(&nd_btt->dev, "%pf: %s: release /dev/%s\n",
+ __builtin_return_address(0), __func__,
+ bdevname(nd_btt->backing_dev, bdev_name));
+ blkdev_put(nd_btt->backing_dev, nd_btt_devs_mode);
+ nd_btt->backing_dev = NULL;
+
+ /*
+ * Once we've had our backing device removed we need to be fully
+ * reconfigured. The bus will have already created a new seed
+ * for this purpose, so now is a good time to clean up this
+ * stale nd_btt instance.
+ */
+ if (nd_btt->dev.driver)
+ nd_device_unregister(&nd_btt->dev, ND_ASYNC);
+ else {
+ ndio_del_claim(ndio_claim);
+ nd_btt->ndio_claim = NULL;
+ }
+}
+
+static ssize_t __backing_dev_store(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t len)
+{
+ struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
+ struct nd_btt *nd_btt = to_nd_btt(dev);
+ char bdev_name[BDEVNAME_SIZE];
+ struct block_device *bdev;
+ struct nd_io *ndio;
+ char *path;
+
+ if (dev->driver) {
+ dev_dbg(dev, "%s: -EBUSY\n", __func__);
+ return -EBUSY;
+ }
+
+ path = kstrndup(buf, len, GFP_KERNEL);
+ if (!path)
+ return -ENOMEM;
+
+ /* detach the backing device */
+ if (strcmp(strim(path), "") == 0) {
+ if (!nd_btt->backing_dev)
+ goto out;
+ nd_btt_ndio_notify_remove(nd_btt->ndio_claim);
+ goto out;
+ } else if (nd_btt->backing_dev) {
+ dev_dbg(dev, "backing_dev already set\n");
+ len = -EBUSY;
+ goto out;
+ }
+
+ bdev = blkdev_get_by_path(strim(path), nd_btt_devs_mode, nd_btt);
+ if (IS_ERR(bdev)) {
+ dev_dbg(dev, "open '%s' failed: %ld\n", strim(path),
+ PTR_ERR(bdev));
+ len = PTR_ERR(bdev);
+ goto out;
+ }
+
+ if (get_capacity(bdev->bd_disk) < SZ_16M / 512) {
+ blkdev_put(bdev, nd_btt_devs_mode);
+ len = -ENXIO;
+ goto out;
+ }
+
+ ndio = ndio_lookup(nvdimm_bus, bdevname(bdev->bd_contains, bdev_name));
+ if (!ndio) {
+ dev_dbg(dev, "%s does not have an ndio interface\n",
+ strim(path));
+ blkdev_put(bdev, nd_btt_devs_mode);
+ len = -ENXIO;
+ goto out;
+ }
+
+ nd_btt->ndio_claim = ndio_add_claim(ndio, &nd_btt->dev,
+ nd_btt_ndio_notify_remove);
+ if (!nd_btt->ndio_claim) {
+ blkdev_put(bdev, nd_btt_devs_mode);
+ len = -ENOMEM;
+ goto out;
+ }
+
+ WARN_ON_ONCE(!is_nvdimm_bus_locked(&nd_btt->dev));
+ nd_btt->backing_dev = bdev;
+
+ out:
+ kfree(path);
+ return len;
+}
+
+static ssize_t backing_dev_store(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t len)
+{
+ ssize_t rc;
+
+ nvdimm_bus_lock(dev);
+ device_lock(dev);
+ rc = __backing_dev_store(dev, attr, buf, len);
+ dev_dbg(dev, "%s: result: %zd wrote: %s%s", __func__,
+ rc, buf, buf[len - 1] == '\n' ? "" : "\n");
+ device_unlock(dev);
+ nvdimm_bus_unlock(dev);
+
+ return rc;
+}
+static DEVICE_ATTR_RW(backing_dev);
+
+static bool is_nd_btt_idle(struct device *dev)
+{
+ struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
+ struct nd_btt *nd_btt = to_nd_btt(dev);
+
+ if (nvdimm_bus->nd_btt == nd_btt || dev->driver || nd_btt->backing_dev)
+ return false;
+ return true;
+}
+
+static ssize_t delete_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ /* return 1 if can be deleted */
+ return sprintf(buf, "%d\n", is_nd_btt_idle(dev));
+}
+
+static ssize_t delete_store(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t len)
+{
+ unsigned long val;
+
+ /* write 1 to delete */
+ if (kstrtoul(buf, 0, &val) != 0 || val != 1)
+ return -EINVAL;
+
+ /* prevent deletion while this btt is active, or is the current seed */
+ if (!is_nd_btt_idle(dev))
+ return -EBUSY;
+
+ /*
+ * userspace raced itself if device goes active here and it gets
+ * to keep the pieces
+ */
+ nd_device_unregister(dev, ND_ASYNC);
+
+ return len;
+}
+static DEVICE_ATTR_RW(delete);
+
+static struct attribute *nd_btt_attributes[] = {
+ &dev_attr_sector_size.attr,
+ &dev_attr_backing_dev.attr,
+ &dev_attr_delete.attr,
+ &dev_attr_uuid.attr,
+ NULL,
+};
+
+static struct attribute_group nd_btt_attribute_group = {
+ .attrs = nd_btt_attributes,
+};
+
+static const struct attribute_group *nd_btt_attribute_groups[] = {
+ &nd_btt_attribute_group,
+ &nd_device_attribute_group,
+ NULL,
+};
+
+static struct nd_btt *__nd_btt_create(struct nvdimm_bus *nvdimm_bus,
+ unsigned long lbasize, u8 *uuid)
+{
+ struct nd_btt *nd_btt = kzalloc(sizeof(*nd_btt), GFP_KERNEL);
+ struct device *dev;
+
+ if (!nd_btt)
+ return NULL;
+ nd_btt->id = ida_simple_get(&btt_ida, 0, 0, GFP_KERNEL);
+ if (nd_btt->id < 0) {
+ kfree(nd_btt);
+ return NULL;
+ }
+
+ nd_btt->lbasize = lbasize;
+ if (uuid)
+ uuid = kmemdup(uuid, 16, GFP_KERNEL);
+ nd_btt->uuid = uuid;
+ dev = &nd_btt->dev;
+ dev_set_name(dev, "btt%d", nd_btt->id);
+ dev->parent = &nvdimm_bus->dev;
+ dev->type = &nd_btt_device_type;
+ dev->groups = nd_btt_attribute_groups;
+ return nd_btt;
+}
+
+struct nd_btt *nd_btt_create(struct nvdimm_bus *nvdimm_bus)
+{
+ struct nd_btt *nd_btt = __nd_btt_create(nvdimm_bus, 0, NULL);
+
+ if (!nd_btt)
+ return NULL;
+ nd_device_register(&nd_btt->dev);
+ return nd_btt;
+}
+
+/*
+ * nd_btt_sb_checksum: compute checksum for btt info block
+ *
+ * Returns a fletcher64 checksum of everything in the given info block
+ * except the last field (since that's where the checksum lives).
+ */
+u64 nd_btt_sb_checksum(struct btt_sb *btt_sb)
+{
+ u64 sum, sum_save;
+
+ sum_save = btt_sb->checksum;
+ btt_sb->checksum = 0;
+ sum = nd_fletcher64(btt_sb, sizeof(*btt_sb), 1);
+ btt_sb->checksum = sum_save;
+ return sum;
+}
+EXPORT_SYMBOL(nd_btt_sb_checksum);
+
+static int nd_btt_autodetect(struct nvdimm_bus *nvdimm_bus, struct nd_io *ndio,
+ struct block_device *bdev)
+{
+ char name[BDEVNAME_SIZE];
+ struct nd_btt *nd_btt;
+ struct btt_sb *btt_sb;
+ u64 offset, checksum;
+ u32 lbasize;
+ u8 *uuid;
+ int rc;
+
+ btt_sb = kzalloc(sizeof(*btt_sb), GFP_KERNEL);
+ if (!btt_sb)
+ return -ENODEV;
+
+ offset = nd_partition_offset(bdev);
+ rc = ndio->rw_bytes(ndio, btt_sb, offset + SZ_4K, sizeof(*btt_sb), READ);
+ if (rc)
+ goto out_free_sb;
+
+ if (get_capacity(bdev->bd_disk) < SZ_16M / 512)
+ goto out_free_sb;
+
+ if (memcmp(btt_sb->signature, BTT_SIG, BTT_SIG_LEN) != 0)
+ goto out_free_sb;
+
+ checksum = le64_to_cpu(btt_sb->checksum);
+ btt_sb->checksum = 0;
+ if (checksum != nd_btt_sb_checksum(btt_sb))
+ goto out_free_sb;
+ btt_sb->checksum = cpu_to_le64(checksum);
+
+ uuid = kmemdup(btt_sb->uuid, 16, GFP_KERNEL);
+ if (!uuid)
+ goto out_free_sb;
+
+ lbasize = le32_to_cpu(btt_sb->external_lbasize);
+ nd_btt = __nd_btt_create(nvdimm_bus, lbasize, uuid);
+ if (!nd_btt)
+ goto out_free_uuid;
+
+ device_initialize(&nd_btt->dev);
+ nd_btt->ndio_claim = ndio_add_claim(ndio, &nd_btt->dev,
+ nd_btt_ndio_notify_remove);
+ if (!nd_btt->ndio_claim)
+ goto out_free_btt;
+
+ nd_btt->backing_dev = bdev;
+ dev_dbg(&nd_btt->dev, "%s: activate %s\n", __func__,
+ bdevname(bdev, name));
+ __nd_device_register(&nd_btt->dev);
+ kfree(btt_sb);
+ return 0;
+
+ out_free_btt:
+ kfree(nd_btt);
+ out_free_uuid:
+ kfree(uuid);
+ out_free_sb:
+ kfree(btt_sb);
+
+ return -ENODEV;
+}
+
+void nd_btt_notify_ndio(struct nvdimm_bus *nvdimm_bus, struct nd_io *ndio)
+{
+ struct disk_part_iter piter;
+ struct hd_struct *part;
+
+ disk_part_iter_init(&piter, ndio->disk, DISK_PITER_INCL_PART0);
+ while ((part = disk_part_iter_next(&piter))) {
+ struct block_device *bdev;
+ int rc;
+
+ bdev = bdget_disk(ndio->disk, part->partno);
+ if (!bdev)
+ continue;
+ if (blkdev_get(bdev, nd_btt_devs_mode, nvdimm_bus) != 0)
+ continue;
+ rc = nd_btt_autodetect(nvdimm_bus, ndio, bdev);
+ if (rc)
+ blkdev_put(bdev, nd_btt_devs_mode);
+ /* no need to scan further in the case of whole disk btt */
+ if (rc == 0 && part->partno == 0)
+ break;
+ }
+ disk_part_iter_exit(&piter);
+}
diff --git a/drivers/nvdimm/bus.c b/drivers/nvdimm/bus.c
index fbf21dbd80fa..5c977c1306db 100644
--- a/drivers/nvdimm/bus.c
+++ b/drivers/nvdimm/bus.c
@@ -16,6 +16,7 @@
#include <linux/module.h>
#include <linux/fcntl.h>
#include <linux/async.h>
+#include <linux/genhd.h>
#include <linux/ndctl.h>
#include <linux/sched.h>
#include <linux/slab.h>
@@ -40,6 +41,8 @@ static int to_nd_device_type(struct device *dev)
return ND_DEVICE_REGION_BLK;
else if (is_nd_pmem(dev->parent) || is_nd_blk(dev->parent))
return nd_region_to_namespace_type(to_nd_region(dev->parent));
+ else if (is_nd_btt(dev))
+ return ND_DEVICE_BTT;
return 0;
}
@@ -84,6 +87,21 @@ static int nvdimm_bus_probe(struct device *dev)
dev_dbg(&nvdimm_bus->dev, "%s.probe(%s) = %d\n", dev->driver->name,
dev_name(dev), rc);
+
+ /* check if our btt-seed has sprouted, and plant another */
+ if (rc == 0 && is_nd_btt(dev) && dev == &nvdimm_bus->nd_btt->dev) {
+ const char *sep = "", *name = "", *status = "failed";
+
+ nvdimm_bus->nd_btt = nd_btt_create(nvdimm_bus);
+ if (nvdimm_bus->nd_btt) {
+ status = "succeeded";
+ sep = ": ";
+ name = dev_name(&nvdimm_bus->nd_btt->dev);
+ }
+ dev_dbg(&nvdimm_bus->dev, "btt seed creation %s%s%s\n",
+ status, sep, name);
+ }
+
if (rc != 0)
module_put(provider);
return rc;
@@ -144,14 +162,19 @@ static void nd_async_device_unregister(void *d, async_cookie_t cookie)
put_device(dev);
}
-void nd_device_register(struct device *dev)
+void __nd_device_register(struct device *dev)
{
dev->bus = &nvdimm_bus_type;
- device_initialize(dev);
get_device(dev);
async_schedule_domain(nd_async_device_register, dev,
&nd_async_domain);
}
+
+void nd_device_register(struct device *dev)
+{
+ device_initialize(dev);
+ __nd_device_register(dev);
+}
EXPORT_SYMBOL(nd_device_register);
void nd_device_unregister(struct device *dev, enum nd_async_mode mode)
@@ -200,6 +223,107 @@ int __nd_driver_register(struct nd_device_driver *nd_drv, struct module *owner,
}
EXPORT_SYMBOL(__nd_driver_register);
+/**
+ * nd_register_ndio() - register byte-aligned access capability for an nd-bdev
+ * @disk: child gendisk of the ndio namepace device
+ * @ndio: initialized ndio instance to register
+ *
+ * LOCKING: hold nvdimm_bus_lock() over the creation of ndio->disk and the
+ * subsequent nd_region_ndio event
+ */
+int nd_register_ndio(struct nd_io *ndio)
+{
+ struct nvdimm_bus *nvdimm_bus;
+ struct device *dev;
+
+ if (!ndio || !ndio->dev || !ndio->disk || !list_empty(&ndio->list)
+ || !ndio->rw_bytes || !list_empty(&ndio->claims)) {
+ pr_debug("%s bad parameters from %pf\n", __func__,
+ __builtin_return_address(0));
+ return -EINVAL;
+ }
+
+ dev = ndio->dev;
+ nvdimm_bus = walk_to_nvdimm_bus(dev);
+ if (!nvdimm_bus)
+ return -EINVAL;
+
+ WARN_ON_ONCE(!is_nvdimm_bus_locked(&nvdimm_bus->dev));
+ list_add(&ndio->list, &nvdimm_bus->ndios);
+
+ /* TODO: generic infrastructure for 3rd party ndio claimers */
+ nd_btt_notify_ndio(nvdimm_bus, ndio);
+
+ return 0;
+}
+EXPORT_SYMBOL(nd_register_ndio);
+
+/**
+ * __nd_unregister_ndio() - try to remove an ndio interface
+ * @ndio: interface to remove
+ */
+static int __nd_unregister_ndio(struct nd_io *ndio)
+{
+ struct nd_io_claim *ndio_claim, *_n;
+ struct nvdimm_bus *nvdimm_bus;
+ LIST_HEAD(claims);
+
+ nvdimm_bus = walk_to_nvdimm_bus(ndio->dev);
+ if (!nvdimm_bus || list_empty(&ndio->list))
+ return -ENXIO;
+
+ spin_lock(&ndio->lock);
+ list_splice_init(&ndio->claims, &claims);
+ spin_unlock(&ndio->lock);
+
+ list_for_each_entry_safe(ndio_claim, _n, &claims, list)
+ ndio_claim->notify_remove(ndio_claim);
+
+ list_del_init(&ndio->list);
+
+ return 0;
+}
+
+int nd_unregister_ndio(struct nd_io *ndio)
+{
+ struct device *dev = ndio->dev;
+ int rc;
+
+ nvdimm_bus_lock(dev);
+ rc = __nd_unregister_ndio(ndio);
+ nvdimm_bus_unlock(dev);
+
+ /*
+ * Flush in case ->notify_remove() kicked off asynchronous device
+ * unregistration
+ */
+ nd_synchronize();
+
+ return rc;
+}
+EXPORT_SYMBOL(nd_unregister_ndio);
+
+static struct nd_io *__ndio_lookup(struct nvdimm_bus *nvdimm_bus, const char *diskname)
+{
+ struct nd_io *ndio;
+
+ list_for_each_entry(ndio, &nvdimm_bus->ndios, list)
+ if (strcmp(diskname, ndio->disk->disk_name) == 0)
+ return ndio;
+
+ return NULL;
+}
+
+struct nd_io *ndio_lookup(struct nvdimm_bus *nvdimm_bus, const char *diskname)
+{
+ struct nd_io *ndio;
+
+ WARN_ON_ONCE(!is_nvdimm_bus_locked(&nvdimm_bus->dev));
+ ndio = __ndio_lookup(nvdimm_bus, diskname);
+
+ return ndio;
+}
+
static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
diff --git a/drivers/nvdimm/core.c b/drivers/nvdimm/core.c
index 3cff35a94fb1..f4e638f6e721 100644
--- a/drivers/nvdimm/core.c
+++ b/drivers/nvdimm/core.c
@@ -55,6 +55,62 @@ bool is_nvdimm_bus_locked(struct device *dev)
}
EXPORT_SYMBOL(is_nvdimm_bus_locked);
+void nd_init_ndio(struct nd_io *ndio, nd_rw_bytes_fn rw_bytes,
+ struct device *dev, struct gendisk *disk, unsigned long align)
+{
+ memset(ndio, 0, sizeof(*ndio));
+ INIT_LIST_HEAD(&ndio->claims);
+ INIT_LIST_HEAD(&ndio->list);
+ spin_lock_init(&ndio->lock);
+ ndio->dev = dev;
+ ndio->disk = disk;
+ ndio->align = align;
+ ndio->rw_bytes = rw_bytes;
+}
+EXPORT_SYMBOL(nd_init_ndio);
+
+void ndio_del_claim(struct nd_io_claim *ndio_claim)
+{
+ struct nd_io *ndio;
+ struct device *holder;
+
+ if (!ndio_claim)
+ return;
+ ndio = ndio_claim->parent;
+ holder = ndio_claim->holder;
+
+ dev_dbg(holder, "%s: drop %s\n", __func__, dev_name(ndio->dev));
+ spin_lock(&ndio->lock);
+ list_del(&ndio_claim->list);
+ spin_unlock(&ndio->lock);
+ put_device(ndio->dev);
+ kfree(ndio_claim);
+ put_device(holder);
+}
+
+struct nd_io_claim *ndio_add_claim(struct nd_io *ndio, struct device *holder,
+ ndio_notify_remove_fn notify_remove)
+{
+ struct nd_io_claim *ndio_claim = kzalloc(sizeof(*ndio_claim), GFP_KERNEL);
+
+ if (!ndio_claim)
+ return NULL;
+
+ INIT_LIST_HEAD(&ndio_claim->list);
+ ndio_claim->parent = ndio;
+ get_device(ndio->dev);
+
+ spin_lock(&ndio->lock);
+ list_add(&ndio_claim->list, &ndio->claims);
+ spin_unlock(&ndio->lock);
+
+ ndio_claim->holder = holder;
+ ndio_claim->notify_remove = notify_remove;
+ get_device(holder);
+
+ return ndio_claim;
+}
+
u64 nd_fletcher64(void *addr, size_t len, bool le)
{
u32 *buf = addr;
@@ -75,6 +131,8 @@ static void nvdimm_bus_release(struct device *dev)
{
struct nvdimm_bus *nvdimm_bus = container_of(dev, struct nvdimm_bus, dev);
+ WARN_ON(!list_empty(&nvdimm_bus->ndios));
+
ida_simple_remove(&nd_ida, nvdimm_bus->id);
kfree(nvdimm_bus);
}
@@ -271,10 +329,28 @@ static ssize_t wait_probe_show(struct device *dev,
}
static DEVICE_ATTR_RO(wait_probe);
+static ssize_t btt_seed_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev);
+ ssize_t rc;
+
+ nvdimm_bus_lock(dev);
+ if (nvdimm_bus->nd_btt)
+ rc = sprintf(buf, "%s\n", dev_name(&nvdimm_bus->nd_btt->dev));
+ else
+ rc = sprintf(buf, "\n");
+ nvdimm_bus_unlock(dev);
+
+ return rc;
+}
+static DEVICE_ATTR_RO(btt_seed);
+
static struct attribute *nvdimm_bus_attributes[] = {
&dev_attr_commands.attr,
&dev_attr_wait_probe.attr,
&dev_attr_provider.attr,
+ &dev_attr_btt_seed.attr,
NULL,
};
@@ -291,6 +367,7 @@ struct nvdimm_bus *__nvdimm_bus_register(struct device *parent,
if (!nvdimm_bus)
return NULL;
+ INIT_LIST_HEAD(&nvdimm_bus->ndios);
INIT_LIST_HEAD(&nvdimm_bus->list);
init_waitqueue_head(&nvdimm_bus->probe_wait);
nvdimm_bus->id = ida_simple_get(&nd_ida, 0, 0, GFP_KERNEL);
@@ -319,6 +396,8 @@ struct nvdimm_bus *__nvdimm_bus_register(struct device *parent,
list_add_tail(&nvdimm_bus->list, &nvdimm_bus_list);
mutex_unlock(&nvdimm_bus_list_mutex);
+ nvdimm_bus->nd_btt = nd_btt_create(nvdimm_bus);
+
return nvdimm_bus;
err:
put_device(&nvdimm_bus->dev);
diff --git a/drivers/nvdimm/nd-private.h b/drivers/nvdimm/nd-private.h
index b0eed3bcb76d..635af040023f 100644
--- a/drivers/nvdimm/nd-private.h
+++ b/drivers/nvdimm/nd-private.h
@@ -23,14 +23,21 @@ extern struct list_head nvdimm_bus_list;
extern struct mutex nvdimm_bus_list_mutex;
extern int nvdimm_major;
+struct block_device;
+struct nd_io_claim;
+struct nd_btt;
+struct nd_io;
+
struct nvdimm_bus {
struct nvdimm_bus_descriptor *nd_desc;
wait_queue_head_t probe_wait;
struct module *module;
+ struct list_head ndios;
struct list_head list;
struct device dev;
int id, probe_active;
struct mutex reconfig_mutex;
+ struct nd_btt *nd_btt;
};
struct nvdimm {
@@ -42,9 +49,29 @@ struct nvdimm {
int id;
};
+struct nd_io *ndio_lookup(struct nvdimm_bus *nvdimm_bus, const char *diskname);
bool is_nvdimm(struct device *dev);
bool is_nd_blk(struct device *dev);
bool is_nd_pmem(struct device *dev);
+#if IS_ENABLED(CONFIG_ND_BTT_DEVS)
+bool is_nd_btt(struct device *dev);
+struct nd_btt *nd_btt_create(struct nvdimm_bus *nvdimm_bus);
+void nd_btt_notify_ndio(struct nvdimm_bus *nvdimm_bus, struct nd_io *ndio);
+#else
+static inline bool is_nd_btt(struct device *dev)
+{
+ return false;
+}
+
+static inline struct nd_btt *nd_btt_create(struct nvdimm_bus *nvdimm_bus)
+{
+ return NULL;
+}
+
+static inline void nd_btt_notify_ndio(struct nvdimm_bus *nvdimm_bus, struct nd_io *ndio)
+{
+}
+#endif
struct nvdimm_bus *walk_to_nvdimm_bus(struct device *nd_dev);
int __init nvdimm_bus_init(void);
void nvdimm_bus_exit(void);
@@ -59,6 +86,7 @@ void nd_synchronize(void);
int nvdimm_bus_register_dimms(struct nvdimm_bus *nvdimm_bus);
int nvdimm_bus_register_regions(struct nvdimm_bus *nvdimm_bus);
int nvdimm_bus_init_interleave_sets(struct nvdimm_bus *nvdimm_bus);
+void __nd_device_register(struct device *dev);
int nd_match_dimm(struct device *dev, void *data);
struct nd_label_id;
char *nd_label_gen_id(struct nd_label_id *label_id, u8 *uuid, u32 flags);
diff --git a/drivers/nvdimm/nd.h b/drivers/nvdimm/nd.h
index c3ffb5174e8f..a695187330ff 100644
--- a/drivers/nvdimm/nd.h
+++ b/drivers/nvdimm/nd.h
@@ -14,11 +14,17 @@
#define __ND_H__
#include <linux/libnvdimm.h>
#include <linux/device.h>
+#include <linux/genhd.h>
#include <linux/mutex.h>
#include <linux/ndctl.h>
#include <linux/types.h>
+#include <linux/fs.h>
#include "label.h"
+enum {
+ SECTOR_SHIFT = 9,
+};
+
struct nvdimm_drvdata {
struct device *dev;
int nsindex_size;
@@ -111,6 +117,84 @@ static inline unsigned nd_inc_seq(unsigned seq)
return next[seq & 3];
}
+struct nd_io;
+/**
+ * nd_rw_bytes_fn() - access bytes relative to the "whole disk" namespace device
+ * @ndio: per-namespace context
+ * @buf: source / target for the write / read
+ * @offset: offset relative to the start of the namespace device
+ * @n: num bytes to access
+ * @flags: READ, WRITE, and other REQ_* flags
+ *
+ * Note: Implementations may assume that offset + n never crosses ndio->align
+ */
+typedef int (*nd_rw_bytes_fn)(struct nd_io *ndio, void *buf, size_t offset,
+ size_t n, unsigned long flags);
+#define nd_data_dir(flags) (flags & 1)
+
+/**
+ * struct nd_io - info for byte-aligned access to nd devices
+ * @rw_bytes: operation to perform byte-aligned access
+ * @align: a single ->rw_bytes() request may not cross this alignment
+ * @gendisk: whole disk block device for the namespace
+ * @list: for the core to cache a list of "ndio"s for later association
+ * @dev: namespace device
+ * @claims: list of clients using this interface
+ * @lock: protect @claims mutation
+ */
+struct nd_io {
+ nd_rw_bytes_fn rw_bytes;
+ unsigned long align;
+ struct gendisk *disk;
+ struct list_head list;
+ struct device *dev;
+ struct list_head claims;
+ spinlock_t lock;
+};
+
+struct nd_io_claim;
+typedef void (*ndio_notify_remove_fn)(struct nd_io_claim *ndio_claim);
+
+/**
+ * struct nd_io_claim - instance of a claim on a parent ndio
+ * @notify_remove: ndio is going away, release resources
+ * @holder: object that has claimed this ndio
+ * @parent: ndio in use
+ * @holder: holder device
+ * @list: claim peers
+ *
+ * An ndio may be claimed multiple times, consider the case of a btt
+ * instance per partition on a namespace.
+ */
+struct nd_io_claim {
+ struct nd_io *parent;
+ ndio_notify_remove_fn notify_remove;
+ struct list_head list;
+ struct device *holder;
+};
+
+struct nd_btt {
+ struct device dev;
+ struct nd_io *ndio;
+ struct block_device *backing_dev;
+ unsigned long lbasize;
+ u8 *uuid;
+ u64 offset;
+ int id;
+ struct nd_io_claim *ndio_claim;
+};
+
+static inline u64 nd_partition_offset(struct block_device *bdev)
+{
+ struct hd_struct *p;
+
+ if (bdev == bdev->bd_contains)
+ return 0;
+
+ p = bdev->bd_part;
+ return ((u64) p->start_sect) << SECTOR_SHIFT;
+}
+
enum nd_async_mode {
ND_SYNC,
ND_ASYNC,
@@ -125,6 +209,13 @@ ssize_t nd_sector_size_show(unsigned long current_lbasize,
const unsigned long *supported, char *buf);
ssize_t nd_sector_size_store(struct device *dev, const char *buf,
unsigned long *current_lbasize, const unsigned long *supported);
+int nd_register_ndio(struct nd_io *ndio);
+int nd_unregister_ndio(struct nd_io *ndio);
+void nd_init_ndio(struct nd_io *ndio, nd_rw_bytes_fn rw_bytes,
+ struct device *dev, struct gendisk *disk, unsigned long align);
+void ndio_del_claim(struct nd_io_claim *ndio_claim);
+struct nd_io_claim *ndio_add_claim(struct nd_io *ndio, struct device *holder,
+ ndio_notify_remove_fn notify_remove);
int __init nvdimm_init(void);
int __init nd_region_init(void);
void nvdimm_exit(void);
@@ -135,6 +226,9 @@ int nvdimm_init_nsarea(struct nvdimm_drvdata *ndd);
int nvdimm_init_config_data(struct nvdimm_drvdata *ndd);
int nvdimm_set_config_data(struct nvdimm_drvdata *ndd, size_t offset,
void *buf, size_t len);
+struct nd_btt *to_nd_btt(struct device *dev);
+struct btt_sb;
+u64 nd_btt_sb_checksum(struct btt_sb *btt_sb);
struct nd_region *to_nd_region(struct device *dev);
int nd_region_to_namespace_type(struct nd_region *nd_region);
int nd_region_register_namespaces(struct nd_region *nd_region, int *err);
diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c
index 7e7421d9c167..0a85a9ca3ca4 100644
--- a/drivers/nvdimm/pmem.c
+++ b/drivers/nvdimm/pmem.c
@@ -29,6 +29,7 @@
struct pmem_device {
struct request_queue *pmem_queue;
struct gendisk *pmem_disk;
+ struct nd_io ndio;
/* One contiguous memory region per device */
phys_addr_t phys_addr;
@@ -96,6 +97,26 @@ static int pmem_rw_page(struct block_device *bdev, sector_t sector,
return 0;
}
+static int pmem_rw_bytes(struct nd_io *ndio, void *buf, size_t offset,
+ size_t n, unsigned long flags)
+{
+ struct pmem_device *pmem = container_of(ndio, typeof(*pmem), ndio);
+ int rw = nd_data_dir(flags);
+
+ if (unlikely(offset + n > pmem->size)) {
+ dev_WARN_ONCE(ndio->dev, 1, "%s: request out of range\n",
+ __func__);
+ return -EFAULT;
+ }
+
+ if (rw == READ)
+ memcpy(buf, pmem->virt_addr + offset, n);
+ else
+ memcpy(pmem->virt_addr + offset, buf, n);
+
+ return 0;
+}
+
static long pmem_direct_access(struct block_device *bdev, sector_t sector,
void **kaddr, unsigned long *pfn, long size)
{
@@ -169,8 +190,6 @@ static struct pmem_device *pmem_alloc(struct device *dev, struct resource *res,
set_capacity(disk, pmem->size >> 9);
pmem->pmem_disk = disk;
- add_disk(disk);
-
return pmem;
out_free_queue:
@@ -222,7 +241,12 @@ static int nd_pmem_probe(struct device *dev)
if (IS_ERR(pmem))
return PTR_ERR(pmem);
+ nvdimm_bus_lock(dev);
+ add_disk(pmem->pmem_disk);
dev_set_drvdata(dev, pmem);
+ nd_init_ndio(&pmem->ndio, pmem_rw_bytes, dev, pmem->pmem_disk, 0);
+ nd_register_ndio(&pmem->ndio);
+ nvdimm_bus_unlock(dev);
return 0;
}
@@ -231,6 +255,7 @@ static int nd_pmem_remove(struct device *dev)
{
struct pmem_device *pmem = dev_get_drvdata(dev);
+ nd_unregister_ndio(&pmem->ndio);
pmem_free(pmem);
return 0;
}
diff --git a/include/uapi/linux/ndctl.h b/include/uapi/linux/ndctl.h
index ac6d40f4fa7e..6f620838ba5a 100644
--- a/include/uapi/linux/ndctl.h
+++ b/include/uapi/linux/ndctl.h
@@ -181,6 +181,7 @@ static inline const char *nvdimm_cmd_name(unsigned cmd)
#define ND_DEVICE_NAMESPACE_IO 4 /* legacy persistent memory */
#define ND_DEVICE_NAMESPACE_PMEM 5 /* persistent memory namespace (may alias) */
#define ND_DEVICE_NAMESPACE_BLK 6 /* block-data-window namespace (may alias) */
+#define ND_DEVICE_BTT 7 /* block-translation table device */
enum nd_driver_flags {
ND_DRIVER_DIMM = 1 << ND_DEVICE_DIMM,
@@ -189,6 +190,7 @@ enum nd_driver_flags {
ND_DRIVER_NAMESPACE_IO = 1 << ND_DEVICE_NAMESPACE_IO,
ND_DRIVER_NAMESPACE_PMEM = 1 << ND_DEVICE_NAMESPACE_PMEM,
ND_DRIVER_NAMESPACE_BLK = 1 << ND_DEVICE_NAMESPACE_BLK,
+ ND_DRIVER_BTT = 1 << ND_DEVICE_BTT,
};
enum {
^ permalink raw reply related [flat|nested] 47+ messages in thread
* [PATCH v5 18/21] nd_btt: atomic sector updates
2015-06-02 0:14 [PATCH v5 00/21] libnvdimm: non-volatile memory devices Dan Williams
` (16 preceding siblings ...)
2015-06-02 0:15 ` [PATCH v5 17/21] libnvdimm: infrastructure for btt devices Dan Williams
@ 2015-06-02 0:15 ` Dan Williams
2015-06-09 6:44 ` Christoph Hellwig
2015-06-02 0:15 ` [PATCH v5 19/21] libnvdimm, nfit, nd_blk: driver for BLK-mode access persistent memory Dan Williams
` (2 subsequent siblings)
20 siblings, 1 reply; 47+ messages in thread
From: Dan Williams @ 2015-06-02 0:15 UTC (permalink / raw)
To: linux-nvdimm
Cc: axboe, sfr, rafael, neilb, gregkh, linux-kernel, mingo,
linux-acpi, jmoyer, linux-api, akpm, hch
From: Vishal Verma <vishal.l.verma@linux.intel.com>
BTT stands for Block Translation Table, and is a way to provide power
fail sector atomicity semantics for block devices that have the ability
to perform byte granularity IO. It relies on the ->rw_bytes() capability
of libnd namespace devices.
The BTT works as a stacked blocked device, and reserves a chunk of space
from the backing device for its accounting metadata.
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Boaz Harrosh <boaz@plexistor.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Jens Axboe <axboe@fb.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Neil Brown <neilb@suse.de>
Cc: Jeff Moyer <jmoyer@redhat.com>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Greg KH <gregkh@linuxfoundation.org>
[jmoyer: fix nmi watchdog timeout in btt_map_init]
[jmoyer: move btt initialization to module load path]
[jmoyer: fix memory leak in the btt initialization path]
[jmoyer: Don't overwrite corrupted arenas]
Signed-off-by: Vishal Verma <vishal.l.verma@linux.intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
Documentation/nvdimm/btt.txt | 273 ++++++++
drivers/acpi/nfit.c | 1
drivers/nvdimm/Kconfig | 30 +
drivers/nvdimm/Makefile | 3
drivers/nvdimm/btt.c | 1440 ++++++++++++++++++++++++++++++++++++++++++
drivers/nvdimm/btt.h | 141 ++++
drivers/nvdimm/btt_devs.c | 3
drivers/nvdimm/nd.h | 10
drivers/nvdimm/region.c | 89 +++
drivers/nvdimm/region_devs.c | 10
include/linux/libnvdimm.h | 1
11 files changed, 1997 insertions(+), 4 deletions(-)
create mode 100644 Documentation/nvdimm/btt.txt
create mode 100644 drivers/nvdimm/btt.c
diff --git a/Documentation/nvdimm/btt.txt b/Documentation/nvdimm/btt.txt
new file mode 100644
index 000000000000..95134d5ec4a0
--- /dev/null
+++ b/Documentation/nvdimm/btt.txt
@@ -0,0 +1,273 @@
+BTT - Block Translation Table
+=============================
+
+
+1. Introduction
+---------------
+
+Persistent memory based storage is able to perform IO at byte (or more
+accurately, cache line) granularity. However, we often want to expose such
+storage as traditional block devices. The block drivers for persistent memory
+will do exactly this. However, they do not provide any atomicity guarantees.
+Traditional SSDs typically provide protection against torn sectors in hardware,
+using stored energy in capacitors to complete in-flight block writes, or perhaps
+in firmware. We don't have this luxury with persistent memory - if a write is in
+progress, and we experience a power failure, the block will contain a mix of old
+and new data. Applications may not be prepared to handle such a scenario.
+
+The Block Translation Table (BTT) provides atomic sector update semantics for
+persistent memory devices, so that applications that rely on sector writes not
+being torn can continue to do so. The BTT manifests itself as a stacked block
+device, and reserves a portion of the underlying storage for its metadata. At
+the heart of it, is an indirection table that re-maps all the blocks on the
+volume. It can be thought of as an extremely simple file system that only
+provides atomic sector updates.
+
+
+2. Static Layout
+----------------
+
+The underlying storage on which a BTT can be laid out is not limited in any way.
+The BTT, however, splits the available space into chunks of up to 512 GiB,
+called "Arenas".
+
+Each arena follows the same layout for its metadata, and all references in an
+arena are internal to it (with the exception of one field that points to the
+next arena). The following depicts the "On-disk" metadata layout:
+
+
+ Backing Store +-------> Arena
++---------------+ | +------------------+
+| | | | Arena info block |
+| Arena 0 +---+ | 4K |
+| 512G | +------------------+
+| | | |
++---------------+ | |
+| | | |
+| Arena 1 | | Data Blocks |
+| 512G | | |
+| | | |
++---------------+ | |
+| . | | |
+| . | | |
+| . | | |
+| | | |
+| | | |
++---------------+ +------------------+
+ | |
+ | BTT Map |
+ | |
+ | |
+ +------------------+
+ | |
+ | BTT Flog |
+ | |
+ +------------------+
+ | Info block copy |
+ | 4K |
+ +------------------+
+
+
+3. Theory of Operation
+----------------------
+
+
+a. The BTT Map
+--------------
+
+The map is a simple lookup/indirection table that maps an LBA to an internal
+block. Each map entry is 32 bits. The two most significant bits are special
+flags, and the remaining form the internal block number.
+
+Bit Description
+31 : TRIM flag - marks if the block was trimmed or discarded
+30 : ERROR flag - marks an error block. Cleared on write.
+29 - 0 : Mappings to internal 'postmap' blocks
+
+
+Some of the terminology that will be subsequently used:
+
+External LBA : LBA as made visible to upper layers.
+ABA : Arena Block Address - Block offset/number within an arena
+Premap ABA : The block offset into an arena, which was decided upon by range
+ checking the External LBA
+Postmap ABA : The block number in the "Data Blocks" area obtained after
+ indirection from the map
+nfree : The number of free blocks that are maintained at any given time.
+ This is the number of concurrent writes that can happen to the
+ arena.
+
+
+For example, after adding a BTT, we surface a disk of 1024G. We get a read for
+the external LBA at 768G. This falls into the second arena, and of the 512G
+worth of blocks that this arena contributes, this block is at 256G. Thus, the
+premap ABA is 256G. We now refer to the map, and find out the mapping for block
+'X' (256G) points to block 'Y', say '64'. Thus the postmap ABA is 64.
+
+
+b. The BTT Flog
+---------------
+
+The BTT provides sector atomicity by making every write an "allocating write",
+i.e. Every write goes to a "free" block. A running list of free blocks is
+maintained in the form of the BTT flog. 'Flog' is a combination of the words
+"free list" and "log". The flog contains 'nfree' entries, and an entry contains:
+
+lba : The premap ABA that is being written to
+old_map : The old postmap ABA - after 'this' write completes, this will be a
+ free block.
+new_map : The new postmap ABA. The map will up updated to reflect this
+ lba->postmap_aba mapping, but we log it here in case we have to
+ recover.
+seq : Sequence number to mark which of the 2 sections of this flog entry is
+ valid/newest. It cycles between 01->10->11->01 (binary) under normal
+ operation, with 00 indicating an uninitialized state.
+lba' : alternate lba entry
+old_map': alternate old postmap entry
+new_map': alternate new postmap entry
+seq' : alternate sequence number.
+
+Each of the above fields is 32-bit, making one entry 16 bytes. Flog updates are
+done such that for any entry being written, it:
+a. overwrites the 'old' section in the entry based on sequence numbers
+b. writes the new entry such that the sequence number is written last.
+
+
+c. The concept of lanes
+-----------------------
+
+While 'nfree' describes the number of concurrent IOs an arena can process
+concurrently, 'nlanes' is the number of IOs the BTT device as a whole can
+process.
+ nlanes = min(nfree, num_cpus)
+A lane number is obtained at the start of any IO, and is used for indexing into
+all the on-disk and in-memory data structures for the duration of the IO. It is
+protected by a spinlock.
+
+
+d. In-memory data structure: Read Tracking Table (RTT)
+------------------------------------------------------
+
+Consider a case where we have two threads, one doing reads and the other,
+writes. We can hit a condition where the writer thread grabs a free block to do
+a new IO, but the (slow) reader thread is still reading from it. In other words,
+the reader consulted a map entry, and started reading the corresponding block. A
+writer started writing to the same external LBA, and finished the write updating
+the map for that external LBA to point to its new postmap ABA. At this point the
+internal, postmap block that the reader is (still) reading has been inserted
+into the list of free blocks. If another write comes in for the same LBA, it can
+grab this free block, and start writing to it, causing the reader to read
+incorrect data. To prevent this, we introduce the RTT.
+
+The RTT is a simple, per arena table with 'nfree' entries. Every reader inserts
+into rtt[lane_number], the postmap ABA it is reading, and clears it after the
+read is complete. Every writer thread, after grabbing a free block, checks the
+RTT for its presence. If the postmap free block is in the RTT, it waits till the
+reader clears the RTT entry, and only then starts writing to it.
+
+
+e. In-memory data structure: map locks
+--------------------------------------
+
+Consider a case where two writer threads are writing to the same LBA. There can
+be a race in the following sequence of steps:
+
+free[lane] = map[premap_aba]
+map[premap_aba] = postmap_aba
+
+Both threads can update their respective free[lane] with the same old, freed
+postmap_aba. This has made the layout inconsistent by losing a free entry, and
+at the same time, duplicating another free entry for two lanes.
+
+To solve this, we could have a single map lock (per arena) that has to be taken
+before performing the above sequence, but we feel that could be too contentious.
+Instead we use an array of (nfree) map_locks that is indexed by
+(premap_aba modulo nfree).
+
+
+f. Reconstruction from the Flog
+-------------------------------
+
+On startup, we analyze the BTT flog to create our list of free blocks. We walk
+through all the entries, and for each lane, of the set of two possible
+'sections', we always look at the most recent one only (based on the sequence
+number). The reconstruction rules/steps are simple:
+- Read map[log_entry.lba].
+- If log_entry.new matches the map entry, then log_entry.old is free.
+- If log_entry.new does not match the map entry, then log_entry.new is free.
+ (This case can only be caused by power-fails/unsafe shutdowns)
+
+
+g. Summarizing - Read and Write flows
+-------------------------------------
+
+Read:
+
+1. Convert external LBA to arena number + pre-map ABA
+2. Get a lane (and take lane_lock)
+3. Read map to get the entry for this pre-map ABA
+4. Enter post-map ABA into RTT[lane]
+5. If TRIM flag set in map, return zeroes, and end IO (go to step 8)
+6. If ERROR flag set in map, end IO with EIO (go to step 8)
+7. Read data from this block
+8. Remove post-map ABA entry from RTT[lane]
+9. Release lane (and lane_lock)
+
+Write:
+
+1. Convert external LBA to Arena number + pre-map ABA
+2. Get a lane (and take lane_lock)
+3. Use lane to index into in-memory free list and obtain a new block, next flog
+ index, next sequence number
+4. Scan the RTT to check if free block is present, and spin/wait if it is.
+5. Write data to this free block
+6. Read map to get the existing post-map ABA entry for this pre-map ABA
+7. Write flog entry: [premap_aba / old postmap_aba / new postmap_aba / seq_num]
+8. Write new post-map ABA into map.
+9. Write old post-map entry into the free list
+10. Calculate next sequence number and write into the free list entry
+11. Release lane (and lane_lock)
+
+
+4. Error Handling
+=================
+
+An arena would be in an error state if any of the metadata is corrupted
+irrecoverably, either due to a bug or a media error. The following conditions
+indicate an error:
+- Info block checksum does not match (and recovering from the copy also fails)
+- All internal available blocks are not uniquely and entirely addressed by the
+ sum of mapped blocks and free blocks (from the BTT flog).
+- Rebuilding free list from the flog reveals missing/duplicate/impossible
+ entries
+- A map entry is out of bounds
+
+If any of these error conditions are encountered, the arena is put into a read
+only state using a flag in the info block.
+
+
+5. In-kernel usage
+==================
+
+Any block driver that supports byte granularity IO to the storage may register
+with the BTT. It will have to provide the rw_bytes interface in its
+block_device_operations struct:
+
+ int (*rw_bytes)(struct gendisk *, void *, size_t, off_t, int rw);
+
+It may register with the BTT after it adds its own gendisk, using btt_init:
+
+ struct btt *btt_init(struct gendisk *disk, unsigned long long rawsize,
+ u32 lbasize, u8 uuid[], int maxlane);
+
+note that maxlane is the maximum amount of concurrency the driver wishes to
+allow the BTT to use.
+
+The BTT 'disk' appears as a stacked block device that grabs the underlying block
+device in the O_EXCL mode.
+
+When the driver wishes to remove the backing disk, it should similarly call
+btt_fini using the same struct btt* handle that was provided to it by btt_init.
+
+ void btt_fini(struct btt *btt);
+
diff --git a/drivers/acpi/nfit.c b/drivers/acpi/nfit.c
index 2eb26069c1da..e027f22014d2 100644
--- a/drivers/acpi/nfit.c
+++ b/drivers/acpi/nfit.c
@@ -891,6 +891,7 @@ static int acpi_nfit_register_region(struct acpi_nfit_desc *acpi_desc,
} else {
nd_mapping->size = nfit_mem->bdw->capacity;
nd_mapping->start = nfit_mem->bdw->start_address;
+ ndr_desc.num_lanes = nfit_mem->bdw->windows;
}
ndr_desc.nd_mapping = nd_mapping;
diff --git a/drivers/nvdimm/Kconfig b/drivers/nvdimm/Kconfig
index 564c8c9b2af6..da7037c018e6 100644
--- a/drivers/nvdimm/Kconfig
+++ b/drivers/nvdimm/Kconfig
@@ -32,9 +32,35 @@ config BLK_DEV_PMEM
capable of DAX (direct-access) file system mappings. See
Documentation/blockdev/nd.txt for more details.
- Say Y if you want to use a NVDIMM described by NFIT
+ Say Y if you want to use a NVDIMM described by ACPI, E820, etc...
config ND_BTT_DEVS
- def_bool y
+ bool
+
+config ND_BTT
+ tristate "BTT: Block Translation Table (atomic sector updates)"
+ depends on LIBNVDIMM
+ default LIBNVDIMM
+ select ND_BTT_DEVS
+ help
+ The Block Translation Table (BTT) provides atomic sector
+ update semantics for persistent memory devices, so that
+ applications that rely on sector writes not being torn (a
+ guarantee that typical disks provide) can continue to do so.
+ The BTT manifests itself as a stacked block device, and
+ reserves a portion of the underlying storage for its
+ metadata.
+
+ Select Y if unsure.
+
+config ND_MAX_REGIONS
+ int "Maximum number of regions supported by the sub-system"
+ default 64
+ ---help---
+ A 'region' corresponds to an individual DIMM or an interleave
+ set of DIMMs. A typical maximally configured system may have
+ up to 32 DIMMs.
+
+ Leave the default of 64 if you are unsure.
endif
diff --git a/drivers/nvdimm/Makefile b/drivers/nvdimm/Makefile
index eb1bbce86592..aa5bb1acf831 100644
--- a/drivers/nvdimm/Makefile
+++ b/drivers/nvdimm/Makefile
@@ -1,8 +1,11 @@
obj-$(CONFIG_LIBNVDIMM) += libnvdimm.o
obj-$(CONFIG_BLK_DEV_PMEM) += nd_pmem.o
+obj-$(CONFIG_ND_BTT) += nd_btt.o
nd_pmem-y := pmem.o
+nd_btt-y := btt.o
+
libnvdimm-y := core.o
libnvdimm-y += bus.o
libnvdimm-y += dimm_devs.o
diff --git a/drivers/nvdimm/btt.c b/drivers/nvdimm/btt.c
new file mode 100644
index 000000000000..932177294f75
--- /dev/null
+++ b/drivers/nvdimm/btt.c
@@ -0,0 +1,1440 @@
+/*
+ * Block Translation Table
+ * Copyright (c) 2014-2015, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ */
+#include <linux/highmem.h>
+#include <linux/debugfs.h>
+#include <linux/blkdev.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/mutex.h>
+#include <linux/hdreg.h>
+#include <linux/genhd.h>
+#include <linux/sizes.h>
+#include <linux/ndctl.h>
+#include <linux/fs.h>
+#include <linux/nd.h>
+#include "btt.h"
+#include "nd.h"
+
+enum log_ent_request {
+ LOG_NEW_ENT = 0,
+ LOG_OLD_ENT
+};
+
+static int btt_major;
+
+static int nd_btt_rw_bytes(struct nd_btt *nd_btt, void *buf, size_t offset,
+ size_t n, unsigned long flags)
+{
+ struct nd_io *ndio = nd_btt->ndio;
+
+ if (unlikely(nd_data_dir(flags) == WRITE)
+ && bdev_read_only(nd_btt->backing_dev))
+ return -EACCES;
+
+ return ndio->rw_bytes(ndio, buf, offset + nd_btt->offset, n, flags);
+}
+
+static int arena_rw_bytes(struct arena_info *arena, void *buf, size_t n,
+ size_t offset, unsigned long flags)
+{
+ /* yes, FIXME, 'offset' and 'n' are swapped */
+ return nd_btt_rw_bytes(arena->nd_btt, buf, offset, n, flags);
+}
+
+static int btt_info_write(struct arena_info *arena, struct btt_sb *super)
+{
+ int ret;
+
+ ret = arena_rw_bytes(arena, super, sizeof(struct btt_sb),
+ arena->info2off, WRITE);
+ if (ret)
+ return ret;
+
+ return arena_rw_bytes(arena, super, sizeof(struct btt_sb),
+ arena->infooff, WRITE);
+}
+
+static int btt_info_read(struct arena_info *arena, struct btt_sb *super)
+{
+ WARN_ON(!super);
+ return arena_rw_bytes(arena, super, sizeof(struct btt_sb),
+ arena->infooff, READ);
+}
+
+/*
+ * 'raw' version of btt_map write
+ * Assumptions:
+ * mapping is in little-endian
+ * mapping contains 'E' and 'Z' flags as desired
+ */
+static int __btt_map_write(struct arena_info *arena, u32 lba, __le32 mapping)
+{
+ u64 ns_off = arena->mapoff + (lba * MAP_ENT_SIZE);
+
+ WARN_ON(lba >= arena->external_nlba);
+ return arena_rw_bytes(arena, &mapping, MAP_ENT_SIZE, ns_off, WRITE);
+}
+
+static int btt_map_write(struct arena_info *arena, u32 lba, u32 mapping,
+ u32 z_flag, u32 e_flag)
+{
+ u32 ze;
+ __le32 mapping_le;
+
+ /*
+ * This 'mapping' is supposed to be just the LBA mapping, without
+ * any flags set, so strip the flag bits.
+ */
+ mapping &= MAP_LBA_MASK;
+
+ ze = (z_flag << 1) + e_flag;
+ switch (ze) {
+ case 0:
+ /*
+ * We want to set neither of the Z or E flags, and
+ * in the actual layout, this means setting the bit
+ * positions of both to '1' to indicate a 'normal'
+ * map entry
+ */
+ mapping |= MAP_ENT_NORMAL;
+ break;
+ case 1:
+ mapping |= (1 << MAP_ERR_SHIFT);
+ break;
+ case 2:
+ mapping |= (1 << MAP_TRIM_SHIFT);
+ break;
+ default:
+ /*
+ * The case where Z and E are both sent in as '1' could be
+ * construed as a valid 'normal' case, but we decide not to,
+ * to avoid confusion
+ */
+ WARN_ONCE(1, "Invalid use of Z and E flags\n");
+ return -EIO;
+ }
+
+ mapping_le = cpu_to_le32(mapping);
+ return __btt_map_write(arena, lba, mapping_le);
+}
+
+static int btt_map_read(struct arena_info *arena, u32 lba, u32 *mapping,
+ int *trim, int *error)
+{
+ int ret;
+ __le32 in;
+ u32 raw_mapping, postmap, ze, z_flag, e_flag;
+ u64 ns_off = arena->mapoff + (lba * MAP_ENT_SIZE);
+
+ WARN_ON(lba >= arena->external_nlba);
+
+ ret = arena_rw_bytes(arena, &in, MAP_ENT_SIZE, ns_off, READ);
+ if (ret)
+ return ret;
+
+ raw_mapping = le32_to_cpu(in);
+
+ z_flag = (raw_mapping & MAP_TRIM_MASK) >> MAP_TRIM_SHIFT;
+ e_flag = (raw_mapping & MAP_ERR_MASK) >> MAP_ERR_SHIFT;
+ ze = (z_flag << 1) + e_flag;
+ postmap = raw_mapping & MAP_LBA_MASK;
+
+ /* Reuse the {z,e}_flag variables for *trim and *error */
+ z_flag = 0;
+ e_flag = 0;
+
+ switch (ze) {
+ case 0:
+ /* Initial state. Return postmap = premap */
+ *mapping = lba;
+ break;
+ case 1:
+ *mapping = postmap;
+ e_flag = 1;
+ break;
+ case 2:
+ *mapping = postmap;
+ z_flag = 1;
+ break;
+ case 3:
+ *mapping = postmap;
+ break;
+ default:
+ return -EIO;
+ }
+
+ if (trim)
+ *trim = z_flag;
+ if (error)
+ *error = e_flag;
+
+ return ret;
+}
+
+static int btt_log_read_pair(struct arena_info *arena, u32 lane,
+ struct log_entry *ent)
+{
+ WARN_ON(!ent);
+ return arena_rw_bytes(arena, ent, 2 * LOG_ENT_SIZE,
+ arena->logoff + (2 * lane * LOG_ENT_SIZE), READ);
+}
+
+static struct dentry *debugfs_root;
+
+static void arena_debugfs_init(struct arena_info *a, struct dentry *parent,
+ int idx)
+{
+ char dirname[32];
+ struct dentry *d;
+
+ /* If for some reason, parent bttN was not created, exit */
+ if (!parent)
+ return;
+
+ snprintf(dirname, 32, "arena%d", idx);
+ d = debugfs_create_dir(dirname, parent);
+ if (IS_ERR_OR_NULL(d))
+ return;
+ a->debugfs_dir = d;
+
+ debugfs_create_x64("size", S_IRUGO, d, &a->size);
+ debugfs_create_x64("external_lba_start", S_IRUGO, d,
+ &a->external_lba_start);
+ debugfs_create_x32("internal_nlba", S_IRUGO, d, &a->internal_nlba);
+ debugfs_create_u32("internal_lbasize", S_IRUGO, d,
+ &a->internal_lbasize);
+ debugfs_create_x32("external_nlba", S_IRUGO, d, &a->external_nlba);
+ debugfs_create_u32("external_lbasize", S_IRUGO, d,
+ &a->external_lbasize);
+ debugfs_create_u32("nfree", S_IRUGO, d, &a->nfree);
+ debugfs_create_u16("version_major", S_IRUGO, d, &a->version_major);
+ debugfs_create_u16("version_minor", S_IRUGO, d, &a->version_minor);
+ debugfs_create_x64("nextoff", S_IRUGO, d, &a->nextoff);
+ debugfs_create_x64("infooff", S_IRUGO, d, &a->infooff);
+ debugfs_create_x64("dataoff", S_IRUGO, d, &a->dataoff);
+ debugfs_create_x64("mapoff", S_IRUGO, d, &a->mapoff);
+ debugfs_create_x64("logoff", S_IRUGO, d, &a->logoff);
+ debugfs_create_x64("info2off", S_IRUGO, d, &a->info2off);
+ debugfs_create_x32("flags", S_IRUGO, d, &a->flags);
+}
+
+static void btt_debugfs_init(struct btt *btt)
+{
+ int i = 0;
+ struct arena_info *arena;
+
+ btt->debugfs_dir = debugfs_create_dir(dev_name(&btt->nd_btt->dev),
+ debugfs_root);
+ if (IS_ERR_OR_NULL(btt->debugfs_dir))
+ return;
+
+ list_for_each_entry(arena, &btt->arena_list, list) {
+ arena_debugfs_init(arena, btt->debugfs_dir, i);
+ i++;
+ }
+}
+
+/*
+ * This function accepts two log entries, and uses the
+ * sequence number to find the 'older' entry.
+ * It also updates the sequence number in this old entry to
+ * make it the 'new' one if the mark_flag is set.
+ * Finally, it returns which of the entries was the older one.
+ *
+ * TODO The logic feels a bit kludge-y. make it better..
+ */
+static int btt_log_get_old(struct log_entry *ent)
+{
+ int old;
+
+ /*
+ * the first ever time this is seen, the entry goes into [0]
+ * the next time, the following logic works out to put this
+ * (next) entry into [1]
+ */
+ if (ent[0].seq == 0) {
+ ent[0].seq = cpu_to_le32(1);
+ return 0;
+ }
+
+ if (ent[0].seq == ent[1].seq)
+ return -EINVAL;
+ if (le32_to_cpu(ent[0].seq) + le32_to_cpu(ent[1].seq) > 5)
+ return -EINVAL;
+
+ if (le32_to_cpu(ent[0].seq) < le32_to_cpu(ent[1].seq)) {
+ if (le32_to_cpu(ent[1].seq) - le32_to_cpu(ent[0].seq) == 1)
+ old = 0;
+ else
+ old = 1;
+ } else {
+ if (le32_to_cpu(ent[0].seq) - le32_to_cpu(ent[1].seq) == 1)
+ old = 1;
+ else
+ old = 0;
+ }
+
+ return old;
+}
+
+static struct device *to_dev(struct arena_info *arena)
+{
+ return &arena->nd_btt->dev;
+}
+
+/*
+ * This function copies the desired (old/new) log entry into ent if
+ * it is not NULL. It returns the sub-slot number (0 or 1)
+ * where the desired log entry was found. Negative return values
+ * indicate errors.
+ */
+static int btt_log_read(struct arena_info *arena, u32 lane,
+ struct log_entry *ent, int old_flag)
+{
+ int ret;
+ int old_ent, ret_ent;
+ struct log_entry log[2];
+
+ ret = btt_log_read_pair(arena, lane, log);
+ if (ret)
+ return -EIO;
+
+ old_ent = btt_log_get_old(log);
+ if (old_ent < 0 || old_ent > 1) {
+ dev_info(to_dev(arena),
+ "log corruption (%d): lane %d seq [%d, %d]\n",
+ old_ent, lane, log[0].seq, log[1].seq);
+ /* TODO set error state? */
+ return -EIO;
+ }
+
+ ret_ent = (old_flag ? old_ent : (1 - old_ent));
+
+ if (ent != NULL)
+ memcpy(ent, &log[ret_ent], LOG_ENT_SIZE);
+
+ return ret_ent;
+}
+
+/*
+ * This function commits a log entry to media
+ * It does _not_ prepare the freelist entry for the next write
+ * btt_flog_write is the wrapper for updating the freelist elements
+ */
+static int __btt_log_write(struct arena_info *arena, u32 lane,
+ u32 sub, struct log_entry *ent)
+{
+ int ret;
+ /*
+ * Ignore the padding in log_entry for calculating log_half.
+ * The entry is 'committed' when we write the sequence number,
+ * and we want to ensure that that is the last thing written.
+ * We don't bother writing the padding as that would be extra
+ * media wear and write amplification
+ */
+ unsigned int log_half = (LOG_ENT_SIZE - 2 * sizeof(u64)) / 2;
+ u64 ns_off = arena->logoff + (((2 * lane) + sub) * LOG_ENT_SIZE);
+ void *src = ent;
+
+ /* split the 16B write into atomic, durable halves */
+ ret = arena_rw_bytes(arena, src, log_half, ns_off, WRITE);
+ if (ret)
+ return ret;
+
+ ns_off += log_half;
+ src += log_half;
+ return arena_rw_bytes(arena, src, log_half, ns_off, WRITE);
+}
+
+static int btt_flog_write(struct arena_info *arena, u32 lane, u32 sub,
+ struct log_entry *ent)
+{
+ int ret;
+
+ ret = __btt_log_write(arena, lane, sub, ent);
+ if (ret)
+ return ret;
+
+ /* prepare the next free entry */
+ arena->freelist[lane].sub = 1 - arena->freelist[lane].sub;
+ if (++(arena->freelist[lane].seq) == 4)
+ arena->freelist[lane].seq = 1;
+ arena->freelist[lane].block = le32_to_cpu(ent->old_map);
+
+ return ret;
+}
+
+/*
+ * This function initializes the BTT map to the initial state, which is
+ * all-zeroes, and indicates an identity mapping
+ */
+static int btt_map_init(struct arena_info *arena)
+{
+ int ret = -EINVAL;
+ void *zerobuf;
+ size_t offset = 0;
+ size_t chunk_size = SZ_2M;
+ size_t mapsize = arena->logoff - arena->mapoff;
+
+ zerobuf = kzalloc(chunk_size, GFP_KERNEL);
+ if (!zerobuf)
+ return -ENOMEM;
+
+ while (mapsize) {
+ size_t size = min(mapsize, chunk_size);
+
+ ret = arena_rw_bytes(arena, zerobuf, size,
+ arena->mapoff + offset, WRITE);
+ if (ret)
+ goto free;
+
+ offset += size;
+ mapsize -= size;
+ cond_resched();
+ }
+
+ free:
+ kfree(zerobuf);
+ return ret;
+}
+
+/*
+ * This function initializes the BTT log with 'fake' entries pointing
+ * to the initial reserved set of blocks as being free
+ */
+static int btt_log_init(struct arena_info *arena)
+{
+ int ret;
+ u32 i;
+ struct log_entry log, zerolog;
+
+ memset(&zerolog, 0, sizeof(zerolog));
+
+ for (i = 0; i < arena->nfree; i++) {
+ log.lba = cpu_to_le32(i);
+ log.old_map = cpu_to_le32(arena->external_nlba + i);
+ log.new_map = cpu_to_le32(arena->external_nlba + i);
+ log.seq = cpu_to_le32(LOG_SEQ_INIT);
+ ret = __btt_log_write(arena, i, 0, &log);
+ if (ret)
+ return ret;
+ ret = __btt_log_write(arena, i, 1, &zerolog);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+static int btt_freelist_init(struct arena_info *arena)
+{
+ int old, new, ret;
+ u32 i, map_entry;
+ struct log_entry log_new, log_old;
+
+ arena->freelist = kcalloc(arena->nfree, sizeof(struct free_entry),
+ GFP_KERNEL);
+ if (!arena->freelist)
+ return -ENOMEM;
+
+ for (i = 0; i < arena->nfree; i++) {
+ old = btt_log_read(arena, i, &log_old, LOG_OLD_ENT);
+ if (old < 0)
+ return old;
+
+ new = btt_log_read(arena, i, &log_new, LOG_NEW_ENT);
+ if (new < 0)
+ return new;
+
+ /* sub points to the next one to be overwritten */
+ arena->freelist[i].sub = 1 - new;
+ arena->freelist[i].seq = nd_inc_seq(le32_to_cpu(log_new.seq));
+ arena->freelist[i].block = le32_to_cpu(log_new.old_map);
+
+ /* This implies a newly created or untouched flog entry */
+ if (log_new.old_map == log_new.new_map)
+ continue;
+
+ /* Check if map recovery is needed */
+ ret = btt_map_read(arena, le32_to_cpu(log_new.lba), &map_entry,
+ NULL, NULL);
+ if (ret)
+ return ret;
+ if ((le32_to_cpu(log_new.new_map) != map_entry) &&
+ (le32_to_cpu(log_new.old_map) == map_entry)) {
+ /*
+ * Last transaction wrote the flog, but wasn't able
+ * to complete the map write. So fix up the map.
+ */
+ ret = btt_map_write(arena, le32_to_cpu(log_new.lba),
+ le32_to_cpu(log_new.new_map), 0, 0);
+ if (ret)
+ return ret;
+ }
+
+ }
+
+ return 0;
+}
+
+static int btt_rtt_init(struct arena_info *arena)
+{
+ arena->rtt = kcalloc(arena->nfree, sizeof(u32), GFP_KERNEL);
+ if (arena->rtt == NULL)
+ return -ENOMEM;
+
+ return 0;
+}
+
+static int btt_maplocks_init(struct arena_info *arena)
+{
+ u32 i;
+
+ arena->map_locks = kcalloc(arena->nfree, sizeof(struct aligned_lock),
+ GFP_KERNEL);
+ if (!arena->map_locks)
+ return -ENOMEM;
+
+ for (i = 0; i < arena->nfree; i++)
+ spin_lock_init(&arena->map_locks[i].lock);
+
+ return 0;
+}
+
+static struct arena_info *alloc_arena(struct btt *btt, size_t size,
+ size_t start, size_t arena_off)
+{
+ struct arena_info *arena;
+ u64 logsize, mapsize, datasize;
+ u64 available = size;
+
+ arena = kzalloc(sizeof(struct arena_info), GFP_KERNEL);
+ if (!arena)
+ return NULL;
+ arena->nd_btt = btt->nd_btt;
+
+ if (!size)
+ return arena;
+
+ arena->size = size;
+ arena->external_lba_start = start;
+ arena->external_lbasize = btt->lbasize;
+ arena->internal_lbasize = roundup(arena->external_lbasize,
+ INT_LBASIZE_ALIGNMENT);
+ arena->nfree = BTT_DEFAULT_NFREE;
+ arena->version_major = 1;
+ arena->version_minor = 1;
+
+ if (available % BTT_PG_SIZE)
+ available -= (available % BTT_PG_SIZE);
+
+ /* Two pages are reserved for the super block and its copy */
+ available -= 2 * BTT_PG_SIZE;
+
+ /* The log takes a fixed amount of space based on nfree */
+ logsize = roundup(2 * arena->nfree * sizeof(struct log_entry),
+ BTT_PG_SIZE);
+ available -= logsize;
+
+ /* Calculate optimal split between map and data area */
+ arena->internal_nlba = div_u64(available - BTT_PG_SIZE,
+ arena->internal_lbasize + MAP_ENT_SIZE);
+ arena->external_nlba = arena->internal_nlba - arena->nfree;
+
+ mapsize = roundup((arena->external_nlba * MAP_ENT_SIZE), BTT_PG_SIZE);
+ datasize = available - mapsize;
+
+ /* 'Absolute' values, relative to start of storage space */
+ arena->infooff = arena_off;
+ arena->dataoff = arena->infooff + BTT_PG_SIZE;
+ arena->mapoff = arena->dataoff + datasize;
+ arena->logoff = arena->mapoff + mapsize;
+ arena->info2off = arena->logoff + logsize;
+ return arena;
+}
+
+static void free_arenas(struct btt *btt)
+{
+ struct arena_info *arena, *next;
+
+ list_for_each_entry_safe(arena, next, &btt->arena_list, list) {
+ list_del(&arena->list);
+ kfree(arena->rtt);
+ kfree(arena->map_locks);
+ kfree(arena->freelist);
+ debugfs_remove_recursive(arena->debugfs_dir);
+ kfree(arena);
+ }
+}
+
+/*
+ * This function checks if the metadata layout is valid and error free
+ */
+static int arena_is_valid(struct arena_info *arena, struct btt_sb *super,
+ u8 *uuid, u32 lbasize)
+{
+ u64 checksum;
+
+ if (memcmp(super->uuid, uuid, 16))
+ return 0;
+
+ checksum = le64_to_cpu(super->checksum);
+ super->checksum = 0;
+ if (checksum != nd_btt_sb_checksum(super))
+ return 0;
+ super->checksum = cpu_to_le64(checksum);
+
+ if (lbasize != le32_to_cpu(super->external_lbasize))
+ return 0;
+
+ /* TODO: figure out action for this */
+ if ((le32_to_cpu(super->flags) & IB_FLAG_ERROR_MASK) != 0)
+ dev_info(to_dev(arena), "Found arena with an error flag\n");
+
+ return 1;
+}
+
+/*
+ * This function reads an existing valid btt superblock and
+ * populates the corresponding arena_info struct
+ */
+static void parse_arena_meta(struct arena_info *arena, struct btt_sb *super,
+ u64 arena_off)
+{
+ arena->internal_nlba = le32_to_cpu(super->internal_nlba);
+ arena->internal_lbasize = le32_to_cpu(super->internal_lbasize);
+ arena->external_nlba = le32_to_cpu(super->external_nlba);
+ arena->external_lbasize = le32_to_cpu(super->external_lbasize);
+ arena->nfree = le32_to_cpu(super->nfree);
+ arena->version_major = le16_to_cpu(super->version_major);
+ arena->version_minor = le16_to_cpu(super->version_minor);
+
+ arena->nextoff = (super->nextoff == 0) ? 0 : (arena_off +
+ le64_to_cpu(super->nextoff));
+ arena->infooff = arena_off;
+ arena->dataoff = arena_off + le64_to_cpu(super->dataoff);
+ arena->mapoff = arena_off + le64_to_cpu(super->mapoff);
+ arena->logoff = arena_off + le64_to_cpu(super->logoff);
+ arena->info2off = arena_off + le64_to_cpu(super->info2off);
+
+ arena->size = (super->nextoff > 0) ? (le64_to_cpu(super->nextoff)) :
+ (arena->info2off - arena->infooff + BTT_PG_SIZE);
+
+ arena->flags = le32_to_cpu(super->flags);
+}
+
+static int discover_arenas(struct btt *btt)
+{
+ int ret = 0;
+ struct arena_info *arena;
+ struct btt_sb *super;
+ size_t remaining = btt->rawsize;
+ u64 cur_nlba = 0;
+ size_t cur_off = 0;
+ int num_arenas = 0;
+
+ super = kzalloc(sizeof(*super), GFP_KERNEL);
+ if (!super)
+ return -ENOMEM;
+
+ while (remaining) {
+ /* Alloc memory for arena */
+ arena = alloc_arena(btt, 0, 0, 0);
+ if (!arena) {
+ ret = -ENOMEM;
+ goto out_super;
+ }
+
+ arena->infooff = cur_off;
+ ret = btt_info_read(arena, super);
+ if (ret)
+ goto out;
+
+ if (!arena_is_valid(arena, super, btt->nd_btt->uuid,
+ btt->lbasize)) {
+ if (remaining == btt->rawsize) {
+ btt->init_state = INIT_NOTFOUND;
+ dev_info(to_dev(arena), "No existing arenas\n");
+ goto out;
+ } else {
+ dev_info(to_dev(arena),
+ "Found corrupted metadata!\n");
+ ret = -ENODEV;
+ goto out;
+ }
+ }
+
+ arena->external_lba_start = cur_nlba;
+ parse_arena_meta(arena, super, cur_off);
+
+ ret = btt_freelist_init(arena);
+ if (ret)
+ goto out;
+
+ ret = btt_rtt_init(arena);
+ if (ret)
+ goto out;
+
+ ret = btt_maplocks_init(arena);
+ if (ret)
+ goto out;
+
+ list_add_tail(&arena->list, &btt->arena_list);
+
+ remaining -= arena->size;
+ cur_off += arena->size;
+ cur_nlba += arena->external_nlba;
+ num_arenas++;
+
+ if (arena->nextoff == 0)
+ break;
+ }
+ btt->num_arenas = num_arenas;
+ btt->nlba = cur_nlba;
+ btt->init_state = INIT_READY;
+
+ kfree(super);
+ return ret;
+
+ out:
+ kfree(arena);
+ free_arenas(btt);
+ out_super:
+ kfree(super);
+ return ret;
+}
+
+static int create_arenas(struct btt *btt)
+{
+ size_t remaining = btt->rawsize;
+ size_t cur_off = 0;
+
+ while (remaining) {
+ struct arena_info *arena;
+ size_t arena_size = min_t(u64, ARENA_MAX_SIZE, remaining);
+
+ remaining -= arena_size;
+ if (arena_size < ARENA_MIN_SIZE)
+ break;
+
+ arena = alloc_arena(btt, arena_size, btt->nlba, cur_off);
+ if (!arena) {
+ free_arenas(btt);
+ return -ENOMEM;
+ }
+ btt->nlba += arena->external_nlba;
+ if (remaining >= ARENA_MIN_SIZE)
+ arena->nextoff = arena->size;
+ else
+ arena->nextoff = 0;
+ cur_off += arena_size;
+ list_add_tail(&arena->list, &btt->arena_list);
+ }
+
+ return 0;
+}
+
+/*
+ * This function completes arena initialization by writing
+ * all the metadata.
+ * It is only called for an uninitialized arena when a write
+ * to that arena occurs for the first time.
+ */
+static int btt_arena_write_layout(struct arena_info *arena, u8 *uuid)
+{
+ int ret;
+ struct btt_sb *super;
+
+ ret = btt_map_init(arena);
+ if (ret)
+ return ret;
+
+ ret = btt_log_init(arena);
+ if (ret)
+ return ret;
+
+ super = kzalloc(sizeof(struct btt_sb), GFP_NOIO);
+ if (!super)
+ return -ENOMEM;
+
+ strncpy(super->signature, BTT_SIG, BTT_SIG_LEN);
+ memcpy(super->uuid, uuid, 16);
+ super->flags = cpu_to_le32(arena->flags);
+ super->version_major = cpu_to_le16(arena->version_major);
+ super->version_minor = cpu_to_le16(arena->version_minor);
+ super->external_lbasize = cpu_to_le32(arena->external_lbasize);
+ super->external_nlba = cpu_to_le32(arena->external_nlba);
+ super->internal_lbasize = cpu_to_le32(arena->internal_lbasize);
+ super->internal_nlba = cpu_to_le32(arena->internal_nlba);
+ super->nfree = cpu_to_le32(arena->nfree);
+ super->infosize = cpu_to_le32(sizeof(struct btt_sb));
+ super->nextoff = cpu_to_le64(arena->nextoff);
+ /*
+ * Subtract arena->infooff (arena start) so numbers are relative
+ * to 'this' arena
+ */
+ super->dataoff = cpu_to_le64(arena->dataoff - arena->infooff);
+ super->mapoff = cpu_to_le64(arena->mapoff - arena->infooff);
+ super->logoff = cpu_to_le64(arena->logoff - arena->infooff);
+ super->info2off = cpu_to_le64(arena->info2off - arena->infooff);
+
+ super->flags = 0;
+ super->checksum = cpu_to_le64(nd_btt_sb_checksum(super));
+
+ ret = btt_info_write(arena, super);
+
+ kfree(super);
+ return ret;
+}
+
+/*
+ * This function completes the initialization for the BTT namespace
+ * such that it is ready to accept IOs
+ */
+static int btt_meta_init(struct btt *btt)
+{
+ int ret = 0;
+ struct arena_info *arena;
+
+ mutex_lock(&btt->init_lock);
+ list_for_each_entry(arena, &btt->arena_list, list) {
+ ret = btt_arena_write_layout(arena, btt->nd_btt->uuid);
+ if (ret)
+ goto unlock;
+
+ ret = btt_freelist_init(arena);
+ if (ret)
+ goto unlock;
+
+ ret = btt_rtt_init(arena);
+ if (ret)
+ goto unlock;
+
+ ret = btt_maplocks_init(arena);
+ if (ret)
+ goto unlock;
+ }
+
+ btt->init_state = INIT_READY;
+
+ unlock:
+ mutex_unlock(&btt->init_lock);
+ return ret;
+}
+
+/*
+ * This function calculates the arena in which the given LBA lies
+ * by doing a linear walk. This is acceptable since we expect only
+ * a few arenas. If we have backing devices that get much larger,
+ * we can construct a balanced binary tree of arenas at init time
+ * so that this range search becomes faster.
+ */
+static int lba_to_arena(struct btt *btt, sector_t sector, __u32 *premap,
+ struct arena_info **arena)
+{
+ struct arena_info *arena_list;
+ __u64 lba = div_u64(sector << SECTOR_SHIFT, btt->sector_size);
+
+ list_for_each_entry(arena_list, &btt->arena_list, list) {
+ if (lba < arena_list->external_nlba) {
+ *arena = arena_list;
+ *premap = lba;
+ return 0;
+ }
+ lba -= arena_list->external_nlba;
+ }
+
+ return -EIO;
+}
+
+/*
+ * The following (lock_map, unlock_map) are mostly just to improve
+ * readability, since they index into an array of locks
+ */
+static void lock_map(struct arena_info *arena, u32 premap)
+ __acquires(&arena->map_locks[idx].lock)
+{
+ u32 idx = (premap * MAP_ENT_SIZE / L1_CACHE_BYTES) % arena->nfree;
+
+ spin_lock(&arena->map_locks[idx].lock);
+}
+
+static void unlock_map(struct arena_info *arena, u32 premap)
+ __releases(&arena->map_locks[idx].lock)
+{
+ u32 idx = (premap * MAP_ENT_SIZE / L1_CACHE_BYTES) % arena->nfree;
+
+ spin_unlock(&arena->map_locks[idx].lock);
+}
+
+static u64 to_namespace_offset(struct arena_info *arena, u64 lba)
+{
+ return arena->dataoff + ((u64)lba * arena->internal_lbasize);
+}
+
+static int btt_data_read(struct arena_info *arena, struct page *page,
+ unsigned int off, u32 lba, u32 len)
+{
+ int ret;
+ u64 nsoff = to_namespace_offset(arena, lba);
+ void *mem = kmap_atomic(page);
+
+ ret = arena_rw_bytes(arena, mem + off, len, nsoff, READ);
+ kunmap_atomic(mem);
+
+ return ret;
+}
+
+static int btt_data_write(struct arena_info *arena, u32 lba,
+ struct page *page, unsigned int off, u32 len)
+{
+ int ret;
+ u64 nsoff = to_namespace_offset(arena, lba);
+ void *mem = kmap_atomic(page);
+
+ ret = arena_rw_bytes(arena, mem + off, len, nsoff, WRITE);
+ kunmap_atomic(mem);
+
+ return ret;
+}
+
+static void zero_fill_data(struct page *page, unsigned int off, u32 len)
+{
+ void *mem = kmap_atomic(page);
+
+ memset(mem + off, 0, len);
+ kunmap_atomic(mem);
+}
+
+static int btt_read_pg(struct btt *btt, struct page *page, unsigned int off,
+ sector_t sector, unsigned int len)
+{
+ int ret = 0;
+ int t_flag, e_flag;
+ struct arena_info *arena = NULL;
+ u32 lane = 0, premap, postmap;
+
+ while (len) {
+ u32 cur_len;
+
+ lane = nd_region_acquire_lane(btt->nd_region);
+
+ ret = lba_to_arena(btt, sector, &premap, &arena);
+ if (ret)
+ goto out_lane;
+
+ cur_len = min(btt->sector_size, len);
+
+ ret = btt_map_read(arena, premap, &postmap, &t_flag, &e_flag);
+ if (ret)
+ goto out_lane;
+
+ /*
+ * We loop to make sure that the post map LBA didn't change
+ * from under us between writing the RTT and doing the actual
+ * read.
+ */
+ while (1) {
+ u32 new_map;
+
+ if (t_flag) {
+ zero_fill_data(page, off, cur_len);
+ goto out_lane;
+ }
+
+ if (e_flag) {
+ ret = -EIO;
+ goto out_lane;
+ }
+
+ arena->rtt[lane] = RTT_VALID | postmap;
+ /*
+ * Barrier to make sure this write is not reordered
+ * to do the verification map_read before the RTT store
+ */
+ barrier();
+
+ ret = btt_map_read(arena, premap, &new_map, &t_flag,
+ &e_flag);
+ if (ret)
+ goto out_rtt;
+
+ if (postmap == new_map)
+ break;
+
+ postmap = new_map;
+ }
+
+ ret = btt_data_read(arena, page, off, postmap, cur_len);
+ if (ret)
+ goto out_rtt;
+
+ arena->rtt[lane] = RTT_INVALID;
+ nd_region_release_lane(btt->nd_region, lane);
+
+ len -= cur_len;
+ off += cur_len;
+ sector += btt->sector_size >> SECTOR_SHIFT;
+ }
+
+ return 0;
+
+ out_rtt:
+ arena->rtt[lane] = RTT_INVALID;
+ out_lane:
+ nd_region_release_lane(btt->nd_region, lane);
+ return ret;
+}
+
+static int btt_write_pg(struct btt *btt, sector_t sector, struct page *page,
+ unsigned int off, unsigned int len)
+{
+ int ret = 0;
+ struct arena_info *arena = NULL;
+ u32 premap = 0, old_postmap, new_postmap, lane = 0, i;
+ struct log_entry log;
+ int sub;
+
+ while (len) {
+ u32 cur_len;
+
+ lane = nd_region_acquire_lane(btt->nd_region);
+
+ ret = lba_to_arena(btt, sector, &premap, &arena);
+ if (ret)
+ goto out_lane;
+ cur_len = min(btt->sector_size, len);
+
+ if ((arena->flags & IB_FLAG_ERROR_MASK) != 0) {
+ ret = -EIO;
+ goto out_lane;
+ }
+
+ new_postmap = arena->freelist[lane].block;
+
+ /* Wait if the new block is being read from */
+ for (i = 0; i < arena->nfree; i++)
+ while (arena->rtt[i] == (RTT_VALID | new_postmap))
+ cpu_relax();
+
+
+ if (new_postmap >= arena->internal_nlba) {
+ ret = -EIO;
+ goto out_lane;
+ } else
+ ret = btt_data_write(arena, new_postmap, page,
+ off, cur_len);
+ if (ret)
+ goto out_lane;
+
+ lock_map(arena, premap);
+ ret = btt_map_read(arena, premap, &old_postmap, NULL, NULL);
+ if (ret)
+ goto out_map;
+ if (old_postmap >= arena->internal_nlba) {
+ ret = -EIO;
+ goto out_map;
+ }
+
+ log.lba = cpu_to_le32(premap);
+ log.old_map = cpu_to_le32(old_postmap);
+ log.new_map = cpu_to_le32(new_postmap);
+ log.seq = cpu_to_le32(arena->freelist[lane].seq);
+ sub = arena->freelist[lane].sub;
+ ret = btt_flog_write(arena, lane, sub, &log);
+ if (ret)
+ goto out_map;
+
+ ret = btt_map_write(arena, premap, new_postmap, 0, 0);
+ if (ret)
+ goto out_map;
+
+ unlock_map(arena, premap);
+ nd_region_release_lane(btt->nd_region, lane);
+
+ len -= cur_len;
+ off += cur_len;
+ sector += btt->sector_size >> SECTOR_SHIFT;
+ }
+
+ return 0;
+
+ out_map:
+ unlock_map(arena, premap);
+ out_lane:
+ nd_region_release_lane(btt->nd_region, lane);
+ return ret;
+}
+
+static int btt_do_bvec(struct btt *btt, struct page *page,
+ unsigned int len, unsigned int off, int rw,
+ sector_t sector)
+{
+ int ret;
+
+ if (rw == READ) {
+ ret = btt_read_pg(btt, page, off, sector, len);
+ flush_dcache_page(page);
+ } else {
+ flush_dcache_page(page);
+ ret = btt_write_pg(btt, sector, page, off, len);
+ }
+
+ return ret;
+}
+
+static void btt_make_request(struct request_queue *q, struct bio *bio)
+{
+ struct block_device *bdev = bio->bi_bdev;
+ struct btt *btt = q->queuedata;
+ int rw;
+ struct bio_vec bvec;
+ sector_t sector;
+ struct bvec_iter iter;
+ int err = 0;
+
+ sector = bio->bi_iter.bi_sector;
+ if (bio_end_sector(bio) > get_capacity(bdev->bd_disk)) {
+ err = -EIO;
+ goto out;
+ }
+
+ BUG_ON(bio->bi_rw & REQ_DISCARD);
+
+ rw = bio_rw(bio);
+ if (rw == READA)
+ rw = READ;
+
+ bio_for_each_segment(bvec, bio, iter) {
+ unsigned int len = bvec.bv_len;
+
+ BUG_ON(len > PAGE_SIZE);
+ /* Make sure len is in multiples of sector size. */
+ /* XXX is this right? */
+ BUG_ON(len < btt->sector_size);
+ BUG_ON(len % btt->sector_size);
+
+ err = btt_do_bvec(btt, bvec.bv_page, len, bvec.bv_offset,
+ rw, sector);
+ if (err) {
+ dev_info(&btt->nd_btt->dev,
+ "io error in %s sector %lld, len %d,\n",
+ (rw == READ) ? "READ" : "WRITE",
+ (unsigned long long) sector, len);
+ goto out;
+ }
+ sector += len >> SECTOR_SHIFT;
+ }
+
+out:
+ bio_endio(bio, err);
+}
+
+static int btt_rw_page(struct block_device *bdev, sector_t sector,
+ struct page *page, int rw)
+{
+ struct btt *btt = bdev->bd_disk->private_data;
+
+ btt_do_bvec(btt, page, PAGE_CACHE_SIZE, 0, rw, sector);
+ page_endio(page, rw & WRITE, 0);
+ return 0;
+}
+
+
+static int btt_getgeo(struct block_device *bd, struct hd_geometry *geo)
+{
+ /* some standard values */
+ geo->heads = 1 << 6;
+ geo->sectors = 1 << 5;
+ geo->cylinders = get_capacity(bd->bd_disk) >> 11;
+ return 0;
+}
+
+static const struct block_device_operations btt_fops = {
+ .owner = THIS_MODULE,
+ .rw_page = btt_rw_page,
+ .getgeo = btt_getgeo,
+};
+
+static int btt_blk_init(struct btt *btt)
+{
+ struct nd_btt *nd_btt = btt->nd_btt;
+ char name[BDEVNAME_SIZE];
+ int ret;
+
+ /* create a new disk and request queue for btt */
+ btt->btt_queue = blk_alloc_queue(GFP_KERNEL);
+ if (!btt->btt_queue)
+ return -ENOMEM;
+
+ btt->btt_disk = alloc_disk(0);
+ if (!btt->btt_disk) {
+ ret = -ENOMEM;
+ goto out_free_queue;
+ }
+
+ sprintf(btt->btt_disk->disk_name, "%ss",
+ bdevname(nd_btt->backing_dev, name));
+ btt->btt_disk->driverfs_dev = &btt->nd_btt->dev;
+ btt->btt_disk->major = btt_major;
+ btt->btt_disk->first_minor = 0;
+ btt->btt_disk->fops = &btt_fops;
+ btt->btt_disk->private_data = btt;
+ btt->btt_disk->queue = btt->btt_queue;
+ btt->btt_disk->flags = GENHD_FL_EXT_DEVT;
+
+ blk_queue_make_request(btt->btt_queue, btt_make_request);
+ blk_queue_max_hw_sectors(btt->btt_queue, 1024);
+ blk_queue_bounce_limit(btt->btt_queue, BLK_BOUNCE_ANY);
+ blk_queue_logical_block_size(btt->btt_queue, btt->sector_size);
+ btt->btt_queue->queuedata = btt;
+
+ set_capacity(btt->btt_disk, btt->nlba * btt->sector_size >> SECTOR_SHIFT);
+ add_disk(btt->btt_disk);
+
+ return 0;
+
+out_free_queue:
+ blk_cleanup_queue(btt->btt_queue);
+ return ret;
+}
+
+static void btt_blk_cleanup(struct btt *btt)
+{
+ del_gendisk(btt->btt_disk);
+ put_disk(btt->btt_disk);
+ blk_cleanup_queue(btt->btt_queue);
+}
+
+/**
+ * btt_init - initialize a block translation table for the given device
+ * @nd_btt: device with BTT geometry and backing device info
+ * @rawsize: raw size in bytes of the backing device
+ * @lbasize: lba size of the backing device
+ * @uuid: A uuid for the backing device - this is stored on media
+ * @maxlane: maximum number of parallel requests the device can handle
+ *
+ * Initialize a Block Translation Table on a backing device to provide
+ * single sector power fail atomicity.
+ *
+ * Context:
+ * Might sleep.
+ *
+ * Returns:
+ * Pointer to a new struct btt on success, NULL on failure.
+ */
+static struct btt *btt_init(struct nd_btt *nd_btt, unsigned long long rawsize,
+ u32 lbasize, u8 *uuid, struct nd_region *nd_region)
+{
+ int ret;
+ struct btt *btt;
+ struct device *dev = &nd_btt->dev;
+
+ btt = kzalloc(sizeof(struct btt), GFP_KERNEL);
+ if (!btt)
+ return NULL;
+
+ btt->nd_btt = nd_btt;
+ btt->rawsize = rawsize;
+ btt->lbasize = lbasize;
+ btt->sector_size = ((lbasize >= 4096) ? 4096 : 512);
+ INIT_LIST_HEAD(&btt->arena_list);
+ mutex_init(&btt->init_lock);
+ btt->nd_region = nd_region;
+
+ ret = discover_arenas(btt);
+ if (ret) {
+ dev_err(dev, "init: error in arena_discover: %d\n", ret);
+ goto out_free;
+ }
+
+ if (btt->init_state != INIT_READY) {
+ btt->num_arenas = (rawsize / ARENA_MAX_SIZE) +
+ ((rawsize % ARENA_MAX_SIZE) ? 1 : 0);
+ dev_dbg(dev, "init: %d arenas for %llu rawsize\n",
+ btt->num_arenas, rawsize);
+
+ ret = create_arenas(btt);
+ if (ret) {
+ dev_info(dev, "init: create_arenas: %d\n", ret);
+ goto out_free;
+ }
+
+ ret = btt_meta_init(btt);
+ if (ret) {
+ dev_err(dev, "init: error in meta_init: %d\n", ret);
+ return NULL;
+ }
+ }
+
+ ret = btt_blk_init(btt);
+ if (ret) {
+ dev_err(dev, "init: error in blk_init: %d\n", ret);
+ goto out_free;
+ }
+
+ btt_debugfs_init(btt);
+
+ return btt;
+
+ out_free:
+ kfree(btt);
+ return NULL;
+}
+
+/**
+ * btt_fini - de-initialize a BTT
+ * @btt: the BTT handle that was generated by btt_init
+ *
+ * De-initialize a Block Translation Table on device removal
+ *
+ * Context:
+ * Might sleep.
+ */
+static void btt_fini(struct btt *btt)
+{
+ if (btt) {
+ btt_blk_cleanup(btt);
+ free_arenas(btt);
+ debugfs_remove_recursive(btt->debugfs_dir);
+ kfree(btt);
+ }
+}
+
+static int link_btt(struct nd_btt *nd_btt)
+{
+ struct block_device *bdev = nd_btt->backing_dev;
+ struct kobject *dir = &part_to_dev(bdev->bd_part)->kobj;
+
+ return sysfs_create_link(dir, &nd_btt->dev.kobj, "nd_btt");
+}
+
+static void unlink_btt(struct nd_btt *nd_btt)
+{
+ struct block_device *bdev = nd_btt->backing_dev;
+ struct kobject *dir;
+
+ /* if backing_dev was deleted first we may have nothing to unlink */
+ if (!nd_btt->backing_dev)
+ return;
+
+ dir = &part_to_dev(bdev->bd_part)->kobj;
+ sysfs_remove_link(dir, "nd_btt");
+}
+
+static int nd_btt_probe(struct device *dev)
+{
+ struct nd_btt *nd_btt = to_nd_btt(dev);
+ struct nd_io_claim *ndio_claim = nd_btt->ndio_claim;
+ struct nd_region *nd_region;
+ struct block_device *bdev;
+ struct btt *btt;
+ size_t rawsize;
+ int rc;
+
+ if (!ndio_claim || !nd_btt->uuid || !nd_btt->backing_dev
+ || !nd_btt->lbasize)
+ return -ENODEV;
+
+ rc = link_btt(nd_btt);
+ if (rc)
+ return rc;
+
+ bdev = nd_btt->backing_dev;
+ sync_blockdev(bdev);
+ invalidate_bdev(bdev);
+ /* the first 4K of a device is padding */
+ nd_btt->offset = nd_partition_offset(bdev) + SZ_4K;
+ rawsize = (bdev->bd_part->nr_sects << SECTOR_SHIFT) - SZ_4K;
+ if (rawsize < ARENA_MIN_SIZE) {
+ rc = -ENXIO;
+ goto err_btt;
+ }
+ nd_btt->ndio = nd_btt->ndio_claim->parent;
+ nd_region = to_nd_region(nd_btt->ndio->dev->parent);
+ btt = btt_init(nd_btt, rawsize, nd_btt->lbasize, nd_btt->uuid,
+ nd_region);
+ if (!btt) {
+ rc = -ENOMEM;
+ goto err_btt;
+ }
+ dev_set_drvdata(dev, btt);
+
+ return 0;
+ err_btt:
+ unlink_btt(nd_btt);
+ return rc;
+}
+
+static int nd_btt_remove(struct device *dev)
+{
+ struct nd_btt *nd_btt = to_nd_btt(dev);
+ struct btt *btt = dev_get_drvdata(dev);
+
+ btt_fini(btt);
+ unlink_btt(nd_btt);
+
+ return 0;
+}
+
+static struct nd_device_driver nd_btt_driver = {
+ .probe = nd_btt_probe,
+ .remove = nd_btt_remove,
+ .drv = {
+ .name = "nd_btt",
+ },
+ .type = ND_DRIVER_BTT,
+};
+
+static int __init nd_btt_init(void)
+{
+ int rc;
+
+ BUILD_BUG_ON(sizeof(struct btt_sb) != SZ_4K);
+
+ btt_major = register_blkdev(0, "btt");
+ if (btt_major < 0)
+ return btt_major;
+
+ debugfs_root = debugfs_create_dir("btt", NULL);
+ if (IS_ERR_OR_NULL(debugfs_root)) {
+ rc = -ENXIO;
+ goto err_debugfs;
+ }
+
+ rc = nd_driver_register(&nd_btt_driver);
+ if (rc < 0)
+ goto err_driver;
+ return 0;
+
+ err_driver:
+ debugfs_remove_recursive(debugfs_root);
+ err_debugfs:
+ unregister_blkdev(btt_major, "btt");
+
+ return rc;
+}
+
+static void __exit nd_btt_exit(void)
+{
+ driver_unregister(&nd_btt_driver.drv);
+ debugfs_remove_recursive(debugfs_root);
+ unregister_blkdev(btt_major, "btt");
+}
+
+MODULE_ALIAS_ND_DEVICE(ND_DEVICE_BTT);
+MODULE_AUTHOR("Vishal Verma <vishal.l.verma@linux.intel.com>");
+MODULE_LICENSE("GPL v2");
+module_init(nd_btt_init);
+module_exit(nd_btt_exit);
diff --git a/drivers/nvdimm/btt.h b/drivers/nvdimm/btt.h
index e8f6d8e0ddd3..8c95a7792c3e 100644
--- a/drivers/nvdimm/btt.h
+++ b/drivers/nvdimm/btt.h
@@ -19,6 +19,39 @@
#define BTT_SIG_LEN 16
#define BTT_SIG "BTT_ARENA_INFO\0"
+#define MAP_ENT_SIZE 4
+#define MAP_TRIM_SHIFT 31
+#define MAP_TRIM_MASK (1 << MAP_TRIM_SHIFT)
+#define MAP_ERR_SHIFT 30
+#define MAP_ERR_MASK (1 << MAP_ERR_SHIFT)
+#define MAP_LBA_MASK (~((1 << MAP_TRIM_SHIFT) | (1 << MAP_ERR_SHIFT)))
+#define MAP_ENT_NORMAL 0xC0000000
+#define LOG_ENT_SIZE sizeof(struct log_entry)
+#define ARENA_MIN_SIZE (1UL << 24) /* 16 MB */
+#define ARENA_MAX_SIZE (1ULL << 39) /* 512 GB */
+#define RTT_VALID (1UL << 31)
+#define RTT_INVALID 0
+#define INT_LBASIZE_ALIGNMENT 256
+#define BTT_PG_SIZE 4096
+#define BTT_DEFAULT_NFREE ND_MAX_LANES
+#define LOG_SEQ_INIT 1
+
+#define IB_FLAG_ERROR 0x00000001
+#define IB_FLAG_ERROR_MASK 0x00000001
+
+enum btt_init_state {
+ INIT_UNCHECKED = 0,
+ INIT_NOTFOUND,
+ INIT_READY
+};
+
+struct log_entry {
+ __le32 lba;
+ __le32 old_map;
+ __le32 new_map;
+ __le32 seq;
+ __le64 padding[2];
+};
struct btt_sb {
u8 signature[BTT_SIG_LEN];
@@ -42,4 +75,112 @@ struct btt_sb {
__le64 checksum;
};
+struct free_entry {
+ u32 block;
+ u8 sub;
+ u8 seq;
+};
+
+struct aligned_lock {
+ union {
+ spinlock_t lock;
+ u8 cacheline_padding[L1_CACHE_BYTES];
+ };
+};
+
+/**
+ * struct arena_info - handle for an arena
+ * @size: Size in bytes this arena occupies on the raw device.
+ * This includes arena metadata.
+ * @external_lba_start: The first external LBA in this arena.
+ * @internal_nlba: Number of internal blocks available in the arena
+ * including nfree reserved blocks
+ * @internal_lbasize: Internal and external lba sizes may be different as
+ * we can round up 'odd' external lbasizes such as 520B
+ * to be aligned.
+ * @external_nlba: Number of blocks contributed by the arena to the number
+ * reported to upper layers. (internal_nlba - nfree)
+ * @external_lbasize: LBA size as exposed to upper layers.
+ * @nfree: A reserve number of 'free' blocks that is used to
+ * handle incoming writes.
+ * @version_major: Metadata layout version major.
+ * @version_minor: Metadata layout version minor.
+ * @nextoff: Offset in bytes to the start of the next arena.
+ * @infooff: Offset in bytes to the info block of this arena.
+ * @dataoff: Offset in bytes to the data area of this arena.
+ * @mapoff: Offset in bytes to the map area of this arena.
+ * @logoff: Offset in bytes to the log area of this arena.
+ * @info2off: Offset in bytes to the backup info block of this arena.
+ * @freelist: Pointer to in-memory list of free blocks
+ * @rtt: Pointer to in-memory "Read Tracking Table"
+ * @map_locks: Spinlocks protecting concurrent map writes
+ * @nd_btt: Pointer to parent nd_btt structure.
+ * @list: List head for list of arenas
+ * @debugfs_dir: Debugfs dentry
+ * @flags: Arena flags - may signify error states.
+ *
+ * arena_info is a per-arena handle. Once an arena is narrowed down for an
+ * IO, this struct is passed around for the duration of the IO.
+ */
+struct arena_info {
+ u64 size; /* Total bytes for this arena */
+ u64 external_lba_start;
+ u32 internal_nlba;
+ u32 internal_lbasize;
+ u32 external_nlba;
+ u32 external_lbasize;
+ u32 nfree;
+ u16 version_major;
+ u16 version_minor;
+ /* Byte offsets to the different on-media structures */
+ u64 nextoff;
+ u64 infooff;
+ u64 dataoff;
+ u64 mapoff;
+ u64 logoff;
+ u64 info2off;
+ /* Pointers to other in-memory structures for this arena */
+ struct free_entry *freelist;
+ u32 *rtt;
+ struct aligned_lock *map_locks;
+ struct nd_btt *nd_btt;
+ struct list_head list;
+ struct dentry *debugfs_dir;
+ /* Arena flags */
+ u32 flags;
+};
+
+/**
+ * struct btt - handle for a BTT instance
+ * @btt_disk: Pointer to the gendisk for BTT device
+ * @btt_queue: Pointer to the request queue for the BTT device
+ * @arena_list: Head of the list of arenas
+ * @debugfs_dir: Debugfs dentry
+ * @nd_btt: Parent nd_btt struct
+ * @nlba: Number of logical blocks exposed to the upper layers
+ * after removing the amount of space needed by metadata
+ * @rawsize: Total size in bytes of the available backing device
+ * @lbasize: LBA size as requested and presented to upper layers.
+ * This is sector_size + size of any metadata.
+ * @sector_size: The Linux sector size - 512 or 4096
+ * @lanes: Per-lane spinlocks
+ * @init_lock: Mutex used for the BTT initialization
+ * @init_state: Flag describing the initialization state for the BTT
+ * @num_arenas: Number of arenas in the BTT instance
+ */
+struct btt {
+ struct gendisk *btt_disk;
+ struct request_queue *btt_queue;
+ struct list_head arena_list;
+ struct dentry *debugfs_dir;
+ struct nd_btt *nd_btt;
+ u64 nlba;
+ unsigned long long rawsize;
+ u32 lbasize;
+ u32 sector_size;
+ struct nd_region *nd_region;
+ struct mutex init_lock;
+ int init_state;
+ int num_arenas;
+};
#endif
diff --git a/drivers/nvdimm/btt_devs.c b/drivers/nvdimm/btt_devs.c
index f288ed7c490f..740b560d717d 100644
--- a/drivers/nvdimm/btt_devs.c
+++ b/drivers/nvdimm/btt_devs.c
@@ -342,7 +342,8 @@ struct nd_btt *nd_btt_create(struct nvdimm_bus *nvdimm_bus)
*/
u64 nd_btt_sb_checksum(struct btt_sb *btt_sb)
{
- u64 sum, sum_save;
+ u64 sum;
+ __le64 sum_save;
sum_save = btt_sb->checksum;
btt_sb->checksum = 0;
diff --git a/drivers/nvdimm/nd.h b/drivers/nvdimm/nd.h
index a695187330ff..2bea91d270cc 100644
--- a/drivers/nvdimm/nd.h
+++ b/drivers/nvdimm/nd.h
@@ -22,6 +22,12 @@
#include "label.h"
enum {
+ /*
+ * Limits the maximum number of block apertures a dimm can
+ * support and is an input to the geometry/on-disk-format of a
+ * BTT instance
+ */
+ ND_MAX_LANES = 256,
SECTOR_SHIFT = 9,
};
@@ -101,7 +107,7 @@ struct nd_region {
u16 ndr_mappings;
u64 ndr_size;
u64 ndr_start;
- int id;
+ int id, num_lanes;
void *provider_data;
struct nd_interleave_set *nd_set;
struct nd_mapping mapping[0];
@@ -230,6 +236,8 @@ struct nd_btt *to_nd_btt(struct device *dev);
struct btt_sb;
u64 nd_btt_sb_checksum(struct btt_sb *btt_sb);
struct nd_region *to_nd_region(struct device *dev);
+unsigned int nd_region_acquire_lane(struct nd_region *nd_region);
+void nd_region_release_lane(struct nd_region *nd_region, unsigned int lane);
int nd_region_to_namespace_type(struct nd_region *nd_region);
int nd_region_register_namespaces(struct nd_region *nd_region, int *err);
u64 nd_region_interleave_set_cookie(struct nd_region *nd_region);
diff --git a/drivers/nvdimm/region.c b/drivers/nvdimm/region.c
index 9aba44e483e0..aa617bf86506 100644
--- a/drivers/nvdimm/region.c
+++ b/drivers/nvdimm/region.c
@@ -10,18 +10,106 @@
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*/
+#include <linux/cpumask.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/nd.h>
#include "nd.h"
+struct nd_percpu_lane {
+ int count[CONFIG_ND_MAX_REGIONS];
+ spinlock_t lock[CONFIG_ND_MAX_REGIONS];
+};
+
+static DEFINE_PER_CPU(struct nd_percpu_lane, nd_percpu_lane);
+
+static void __init nd_region_init_locks(void)
+{
+ unsigned int i, j;
+
+ for (i = 0; i < nr_cpu_ids; i++)
+ for (j = 0; j < CONFIG_ND_MAX_REGIONS; j++) {
+ struct nd_percpu_lane *ndl;
+
+ ndl = per_cpu_ptr(&nd_percpu_lane, i);
+ spin_lock_init(&ndl->lock[j]);
+ ndl->count[j] = 0;
+ }
+}
+
+/**
+ * nd_region_acquire_lane - allocate and lock a lane
+ * @nd_region: region id and number of lanes possible
+ *
+ * A lane correlates to a BLK-data-window and/or a log slot in the BTT.
+ * We optimize for the common case where there are 256 lanes, one
+ * per-cpu. For larger systems we need to lock to share lanes. For now
+ * this implementation assumes the cost of maintaining an allocator for
+ * free lanes is on the order of the lock hold time, so it implements a
+ * static lane = cpu % num_lanes mapping.
+ *
+ * In the case of a BTT instance on top of a BLK namespace a lane may be
+ * acquired recursively. We lock on the first instance.
+ *
+ * In the case of a BTT instance on top of PMEM, we only acquire a lane
+ * for the BTT metadata updates.
+ */
+unsigned int nd_region_acquire_lane(struct nd_region *nd_region)
+{
+ unsigned int cpu, lane;
+
+ cpu = get_cpu();
+ if (nd_region->num_lanes < nr_cpu_ids) {
+ struct nd_percpu_lane *ndl_lock, *ndl_count;
+ unsigned int id = nd_region->id;
+
+ lane = cpu % nd_region->num_lanes;
+ ndl_count = per_cpu_ptr(&nd_percpu_lane, cpu);
+ ndl_lock = per_cpu_ptr(&nd_percpu_lane, lane);
+ if (ndl_count->count[id]++ == 0)
+ spin_lock(&ndl_lock->lock[id]);
+ } else
+ lane = cpu;
+
+ return lane;
+}
+EXPORT_SYMBOL(nd_region_acquire_lane);
+
+void nd_region_release_lane(struct nd_region *nd_region, unsigned int lane)
+{
+ if (nd_region->num_lanes < nr_cpu_ids) {
+ unsigned int cpu = get_cpu();
+ unsigned int id = nd_region->id;
+ struct nd_percpu_lane *ndl_lock, *ndl_count;
+
+ ndl_count = per_cpu_ptr(&nd_percpu_lane, cpu);
+ ndl_lock = per_cpu_ptr(&nd_percpu_lane, lane);
+ if (--ndl_count->count[id] == 0)
+ spin_unlock(&ndl_lock->lock[id]);
+ put_cpu();
+ }
+ put_cpu();
+}
+EXPORT_SYMBOL(nd_region_release_lane);
+
static int nd_region_probe(struct device *dev)
{
int err;
+ static unsigned long once;
struct nd_region_namespaces *num_ns;
struct nd_region *nd_region = to_nd_region(dev);
int rc = nd_region_register_namespaces(nd_region, &err);
+ if (nd_region->num_lanes > num_online_cpus()
+ && nd_region->num_lanes < num_possible_cpus()
+ && !test_and_set_bit(0, &once)) {
+ dev_info(dev, "online cpus (%d) < concurrent i/o lanes (%d) < possible cpus (%d)\n",
+ num_online_cpus(), nd_region->num_lanes,
+ num_possible_cpus());
+ dev_info(dev, "setting nr_cpus=%d may yield better libnvdimm device performance\n",
+ nd_region->num_lanes);
+ }
+
num_ns = devm_kzalloc(dev, sizeof(*num_ns), GFP_KERNEL);
if (!num_ns)
return -ENOMEM;
@@ -84,6 +172,7 @@ static struct nd_device_driver nd_region_driver = {
int __init nd_region_init(void)
{
+ nd_region_init_locks();
return nd_driver_register(&nd_region_driver);
}
diff --git a/drivers/nvdimm/region_devs.c b/drivers/nvdimm/region_devs.c
index 35ac1bbec683..1274f9300002 100644
--- a/drivers/nvdimm/region_devs.c
+++ b/drivers/nvdimm/region_devs.c
@@ -543,6 +543,12 @@ static noinline struct nd_region *nd_region_create(struct nvdimm_bus *nvdimm_bus
if (nd_region->id < 0) {
kfree(nd_region);
return NULL;
+ } else if (nd_region->id >= CONFIG_ND_MAX_REGIONS) {
+ dev_err(&nvdimm_bus->dev, "max region limit %d reached\n",
+ CONFIG_ND_MAX_REGIONS);
+ ida_simple_remove(®ion_ida, nd_region->id);
+ kfree(nd_region);
+ return NULL;
}
memcpy(nd_region->mapping, ndr_desc->nd_mapping,
@@ -556,6 +562,7 @@ static noinline struct nd_region *nd_region_create(struct nvdimm_bus *nvdimm_bus
nd_region->ndr_mappings = ndr_desc->num_mappings;
nd_region->provider_data = ndr_desc->provider_data;
nd_region->nd_set = ndr_desc->nd_set;
+ nd_region->num_lanes = ndr_desc->num_lanes;
ida_init(&nd_region->ns_ida);
dev = &nd_region->dev;
dev_set_name(dev, "region%d", nd_region->id);
@@ -572,6 +579,7 @@ static noinline struct nd_region *nd_region_create(struct nvdimm_bus *nvdimm_bus
struct nd_region *nvdimm_pmem_region_create(struct nvdimm_bus *nvdimm_bus,
struct nd_region_desc *ndr_desc)
{
+ ndr_desc->num_lanes = ND_MAX_LANES;
return nd_region_create(nvdimm_bus, ndr_desc, &nd_pmem_device_type);
}
EXPORT_SYMBOL_GPL(nvdimm_pmem_region_create);
@@ -581,6 +589,7 @@ struct nd_region *nvdimm_blk_region_create(struct nvdimm_bus *nvdimm_bus,
{
if (ndr_desc->num_mappings > 1)
return NULL;
+ ndr_desc->num_lanes = min(ndr_desc->num_lanes, ND_MAX_LANES);
return nd_region_create(nvdimm_bus, ndr_desc, &nd_blk_device_type);
}
EXPORT_SYMBOL_GPL(nvdimm_blk_region_create);
@@ -588,6 +597,7 @@ EXPORT_SYMBOL_GPL(nvdimm_blk_region_create);
struct nd_region *nvdimm_volatile_region_create(struct nvdimm_bus *nvdimm_bus,
struct nd_region_desc *ndr_desc)
{
+ ndr_desc->num_lanes = ND_MAX_LANES;
return nd_region_create(nvdimm_bus, ndr_desc, &nd_volatile_device_type);
}
EXPORT_SYMBOL_GPL(nvdimm_volatile_region_create);
diff --git a/include/linux/libnvdimm.h b/include/linux/libnvdimm.h
index 79a40c23545d..f97b6adf9653 100644
--- a/include/linux/libnvdimm.h
+++ b/include/linux/libnvdimm.h
@@ -77,6 +77,7 @@ struct nd_region_desc {
const struct attribute_group **attr_groups;
struct nd_interleave_set *nd_set;
void *provider_data;
+ int num_lanes;
};
struct nvdimm_bus;
^ permalink raw reply related [flat|nested] 47+ messages in thread
* [PATCH v5 19/21] libnvdimm, nfit, nd_blk: driver for BLK-mode access persistent memory
2015-06-02 0:14 [PATCH v5 00/21] libnvdimm: non-volatile memory devices Dan Williams
` (17 preceding siblings ...)
2015-06-02 0:15 ` [PATCH v5 18/21] nd_btt: atomic sector updates Dan Williams
@ 2015-06-02 0:15 ` Dan Williams
2015-06-02 0:15 ` [PATCH v5 20/21] tools/testing/nvdimm: manufactured NFITs for interface development Dan Williams
2015-06-02 0:16 ` [PATCH v5 21/21] libnvdimm: Non-Volatile Devices Dan Williams
20 siblings, 0 replies; 47+ messages in thread
From: Dan Williams @ 2015-06-02 0:15 UTC (permalink / raw)
To: linux-nvdimm
Cc: axboe, sfr, rafael, neilb, gregkh, linux-kernel, mingo,
linux-acpi, jmoyer, linux-api, akpm, hch
From: Ross Zwisler <ross.zwisler@linux.intel.com>
The libnvdimm implementation handles allocating dimm address space (DPA)
between PMEM and BLK mode interfaces. After DPA has been allocated from
a BLK-region to a BLK-namespace the nd_blk driver attaches to handle I/O
as a struct bio based block device. Unlike PMEM, BLK is required to
handle platform specific details like mmio register formats and memory
controller interleave. For this reason the libnvdimm generic nd_blk
driver calls back into the bus provider to carry out the I/O.
This initial implementation handles the BLK interface defined by the
ACPI 6 NFIT [1] and the NVDIMM DSM Interface Example [2] composed from
DCR (dimm control region), BDW (block data window), IDT (interleave
descriptor) NFIT structures and the hardware register format.
[1]: http://www.uefi.org/sites/default/files/resources/ACPI_6.0.pdf
[2]: http://pmem.io/documents/NVDIMM_DSM_Interface_Example.pdf
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Boaz Harrosh <boaz@plexistor.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Jens Axboe <axboe@fb.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
drivers/acpi/nfit.c | 441 +++++++++++++++++++++++++++++++++++++--
drivers/acpi/nfit.h | 49 ++++
drivers/nvdimm/Kconfig | 13 +
drivers/nvdimm/Makefile | 3
drivers/nvdimm/blk.c | 252 ++++++++++++++++++++++
drivers/nvdimm/dimm_devs.c | 9 +
drivers/nvdimm/namespace_devs.c | 47 ++++
drivers/nvdimm/nd-private.h | 3
drivers/nvdimm/nd.h | 13 +
drivers/nvdimm/region.c | 8 +
drivers/nvdimm/region_devs.c | 90 +++++++-
include/linux/libnvdimm.h | 19 ++
12 files changed, 908 insertions(+), 39 deletions(-)
create mode 100644 drivers/nvdimm/blk.c
diff --git a/drivers/acpi/nfit.c b/drivers/acpi/nfit.c
index e027f22014d2..1124c47f7b06 100644
--- a/drivers/acpi/nfit.c
+++ b/drivers/acpi/nfit.c
@@ -13,12 +13,16 @@
#include <linux/list_sort.h>
#include <linux/libnvdimm.h>
#include <linux/module.h>
+#include <linux/mutex.h>
#include <linux/ndctl.h>
#include <linux/list.h>
#include <linux/acpi.h>
#include <linux/sort.h>
+#include <linux/io.h>
#include "nfit.h"
+#include <asm-generic/io-64-nonatomic-hi-lo.h>
+
static bool force_enable_dimms;
module_param(force_enable_dimms, bool, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(force_enable_dimms, "Ignore _STA (ACPI DIMM device) status");
@@ -71,7 +75,7 @@ static int acpi_nfit_ctl(struct nvdimm_bus_descriptor *nd_desc,
if (!adev)
return -ENOTTY;
- dimm_name = dev_name(&adev->dev);
+ dimm_name = nvdimm_name(nvdimm);
cmd_name = nvdimm_cmd_name(cmd);
dsm_mask = nfit_mem->dsm_mask;
desc = nd_cmd_dimm_desc(cmd);
@@ -266,10 +270,20 @@ static void *add_table(struct acpi_nfit_desc *acpi_desc, void *table, const void
bdw->region_index, bdw->windows);
break;
}
- /* TODO */
- case ACPI_NFIT_TYPE_INTERLEAVE:
- dev_dbg(dev, "%s: idt\n", __func__);
+ case ACPI_NFIT_TYPE_INTERLEAVE: {
+ struct nfit_idt *nfit_idt = devm_kzalloc(dev, sizeof(*nfit_idt),
+ GFP_KERNEL);
+ struct acpi_nfit_interleave *idt = table;
+
+ if (!nfit_idt)
+ return err;
+ INIT_LIST_HEAD(&nfit_idt->list);
+ nfit_idt->idt = idt;
+ list_add_tail(&nfit_idt->list, &acpi_desc->idts);
+ dev_dbg(dev, "%s: idt index: %d num_lines: %d\n", __func__,
+ idt->interleave_index, idt->line_count);
break;
+ }
case ACPI_NFIT_TYPE_FLUSH_ADDRESS:
dev_dbg(dev, "%s: flush\n", __func__);
break;
@@ -321,8 +335,11 @@ static int nfit_mem_add(struct acpi_nfit_desc *acpi_desc,
struct nfit_mem *nfit_mem, struct acpi_nfit_system_address *spa)
{
u16 dcr_index = __to_nfit_memdev(nfit_mem)->region_index;
+ struct nfit_memdev *nfit_memdev;
struct nfit_dcr *nfit_dcr;
struct nfit_bdw *nfit_bdw;
+ struct nfit_idt *nfit_idt;
+ u16 idt_index, range_index;
list_for_each_entry(nfit_dcr, &acpi_desc->dcrs, list) {
if (nfit_dcr->dcr->region_index != dcr_index)
@@ -355,6 +372,26 @@ static int nfit_mem_add(struct acpi_nfit_desc *acpi_desc,
return 0;
nfit_mem_find_spa_bdw(acpi_desc, nfit_mem);
+
+ if (!nfit_mem->spa_bdw)
+ return 0;
+
+ range_index = nfit_mem->spa_bdw->range_index;
+ list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) {
+ if (nfit_memdev->memdev->range_index != range_index ||
+ nfit_memdev->memdev->region_index != dcr_index)
+ continue;
+ nfit_mem->memdev_bdw = nfit_memdev->memdev;
+ idt_index = nfit_memdev->memdev->interleave_index;
+ list_for_each_entry(nfit_idt, &acpi_desc->idts, list) {
+ if (nfit_idt->idt->interleave_index != idt_index)
+ continue;
+ nfit_mem->idt_bdw = nfit_idt->idt;
+ break;
+ }
+ break;
+ }
+
return 0;
}
@@ -398,9 +435,19 @@ static int nfit_mem_dcr_init(struct acpi_nfit_desc *acpi_desc,
}
if (type == NFIT_SPA_DCR) {
+ struct nfit_idt *nfit_idt;
+ u16 idt_index;
+
/* multiple dimms may share a SPA when interleaved */
nfit_mem->spa_dcr = spa;
nfit_mem->memdev_dcr = nfit_memdev->memdev;
+ idt_index = nfit_memdev->memdev->interleave_index;
+ list_for_each_entry(nfit_idt, &acpi_desc->idts, list) {
+ if (nfit_idt->idt->interleave_index != idt_index)
+ continue;
+ nfit_mem->idt_dcr = nfit_idt->idt;
+ break;
+ }
} else {
/*
* A single dimm may belong to multiple SPA-PM
@@ -829,13 +876,362 @@ static int acpi_nfit_init_interleave_set(struct acpi_nfit_desc *acpi_desc,
return 0;
}
+static u64 to_interleave_offset(u64 offset, struct nfit_blk_mmio *mmio)
+{
+ struct acpi_nfit_interleave *idt = mmio->idt;
+ u32 sub_line_offset, line_index, line_offset;
+ u64 line_no, table_skip_count, table_offset;
+
+ line_no = div_u64_rem(offset, mmio->line_size, &sub_line_offset);
+ table_skip_count = div_u64_rem(line_no, mmio->num_lines, &line_index);
+ line_offset = idt->line_offset[line_index]
+ * mmio->line_size;
+ table_offset = table_skip_count * mmio->table_size;
+
+ return mmio->base_offset + line_offset + table_offset + sub_line_offset;
+}
+
+static u64 read_blk_stat(struct nfit_blk *nfit_blk, unsigned int bw)
+{
+ struct nfit_blk_mmio *mmio = &nfit_blk->mmio[DCR];
+ u64 offset = nfit_blk->stat_offset + mmio->size * bw;
+
+ if (mmio->num_lines)
+ offset = to_interleave_offset(offset, mmio);
+
+ return readq(mmio->base + offset);
+}
+
+static void write_blk_ctl(struct nfit_blk *nfit_blk, unsigned int bw,
+ resource_size_t dpa, unsigned int len, unsigned int write)
+{
+ u64 cmd, offset;
+ struct nfit_blk_mmio *mmio = &nfit_blk->mmio[DCR];
+
+ enum {
+ BCW_OFFSET_MASK = (1ULL << 48)-1,
+ BCW_LEN_SHIFT = 48,
+ BCW_LEN_MASK = (1ULL << 8) - 1,
+ BCW_CMD_SHIFT = 56,
+ };
+
+ cmd = (dpa >> L1_CACHE_SHIFT) & BCW_OFFSET_MASK;
+ len = len >> L1_CACHE_SHIFT;
+ cmd |= ((u64) len & BCW_LEN_MASK) << BCW_LEN_SHIFT;
+ cmd |= ((u64) write) << BCW_CMD_SHIFT;
+
+ offset = nfit_blk->cmd_offset + mmio->size * bw;
+ if (mmio->num_lines)
+ offset = to_interleave_offset(offset, mmio);
+
+ writeq(cmd, mmio->base + offset);
+ /* FIXME: conditionally perform read-back if mandated by firmware */
+}
+
+static int acpi_nfit_blk_single_io(struct nfit_blk *nfit_blk, void *iobuf,
+ unsigned int len, int write, resource_size_t dpa,
+ unsigned int bw)
+{
+ struct nfit_blk_mmio *mmio = &nfit_blk->mmio[BDW];
+ unsigned int copied = 0;
+ u64 base_offset;
+ int rc;
+
+ base_offset = nfit_blk->bdw_offset + dpa % L1_CACHE_BYTES + bw * mmio->size;
+ /* TODO: non-temporal access, flush hints, cache management etc... */
+ write_blk_ctl(nfit_blk, bw, dpa, len, write);
+ while (len) {
+ unsigned int c;
+ u64 offset;
+
+ if (mmio->num_lines) {
+ u32 line_offset;
+
+ offset = to_interleave_offset(base_offset + copied,
+ mmio);
+ div_u64_rem(offset, mmio->line_size, &line_offset);
+ c = min(len, mmio->line_size - line_offset);
+ } else {
+ offset = base_offset + nfit_blk->bdw_offset;
+ c = len;
+ }
+
+ if (write)
+ memcpy(mmio->aperture + offset, iobuf + copied, c);
+ else
+ memcpy(iobuf + copied, mmio->aperture + offset, c);
+
+ copied += c;
+ len -= c;
+ }
+ rc = read_blk_stat(nfit_blk, bw) ? -EIO : 0;
+ return rc;
+}
+
+static int acpi_nfit_blk_region_do_io(struct nd_blk_region *ndbr, void *iobuf,
+ u64 len, int write, resource_size_t dpa)
+{
+ struct nfit_blk *nfit_blk = nd_blk_region_provider_data(ndbr);
+ struct nfit_blk_mmio *mmio = &nfit_blk->mmio[BDW];
+ struct nd_region *nd_region = nfit_blk->nd_region;
+ unsigned int bw, copied = 0;
+ int rc = 0;
+
+ bw = nd_region_acquire_lane(nd_region);
+ while (len) {
+ u64 c = min(len, mmio->size);
+
+ rc = acpi_nfit_blk_single_io(nfit_blk, iobuf + copied, c, write,
+ dpa + copied, bw);
+ if (rc)
+ break;
+
+ copied += c;
+ len -= c;
+ }
+ nd_region_release_lane(nd_region, bw);
+
+ return rc;
+}
+
+static void nfit_spa_mapping_release(struct kref *kref)
+{
+ struct nfit_spa_mapping *spa_map = to_spa_map(kref);
+ struct acpi_nfit_system_address *spa = spa_map->spa;
+ struct acpi_nfit_desc *acpi_desc = spa_map->acpi_desc;
+
+ WARN_ON(!mutex_is_locked(&acpi_desc->spa_map_mutex));
+ dev_dbg(acpi_desc->dev, "%s: SPA%d\n", __func__, spa->range_index);
+ iounmap(spa_map->iomem);
+ release_mem_region(spa->address, spa->length);
+ list_del(&spa_map->list);
+ kfree(spa_map);
+}
+
+static struct nfit_spa_mapping *find_spa_mapping(struct acpi_nfit_desc *acpi_desc,
+ struct acpi_nfit_system_address *spa)
+{
+ struct nfit_spa_mapping *spa_map;
+
+ WARN_ON(!mutex_is_locked(&acpi_desc->spa_map_mutex));
+ list_for_each_entry(spa_map, &acpi_desc->spa_maps, list)
+ if (spa_map->spa == spa)
+ return spa_map;
+
+ return NULL;
+}
+
+static void nfit_spa_unmap(struct acpi_nfit_desc *acpi_desc,
+ struct acpi_nfit_system_address *spa)
+{
+ struct nfit_spa_mapping *spa_map;
+
+ mutex_lock(&acpi_desc->spa_map_mutex);
+ spa_map = find_spa_mapping(acpi_desc, spa);
+
+ if (spa_map)
+ kref_put(&spa_map->kref, nfit_spa_mapping_release);
+ mutex_unlock(&acpi_desc->spa_map_mutex);
+}
+
+static void __iomem *__nfit_spa_map(struct acpi_nfit_desc *acpi_desc,
+ struct acpi_nfit_system_address *spa)
+{
+ resource_size_t start = spa->address;
+ resource_size_t n = spa->length;
+ struct nfit_spa_mapping *spa_map;
+ struct resource *res;
+
+ WARN_ON(!mutex_is_locked(&acpi_desc->spa_map_mutex));
+
+ spa_map = find_spa_mapping(acpi_desc, spa);
+ if (spa_map) {
+ kref_get(&spa_map->kref);
+ return spa_map->iomem;
+ }
+
+ spa_map = kzalloc(sizeof(*spa_map), GFP_KERNEL);
+ if (!spa_map)
+ return NULL;
+
+ INIT_LIST_HEAD(&spa_map->list);
+ spa_map->spa = spa;
+ kref_init(&spa_map->kref);
+ spa_map->acpi_desc = acpi_desc;
+
+ res = request_mem_region(start, n, dev_name(acpi_desc->dev));
+ if (!res)
+ goto err_mem;
+
+ /* TODO: cacheability based on the spa type */
+ spa_map->iomem = ioremap_nocache(start, n);
+ if (!spa_map->iomem)
+ goto err_map;
+
+ list_add_tail(&spa_map->list, &acpi_desc->spa_maps);
+ return spa_map->iomem;
+
+ err_map:
+ release_mem_region(start, n);
+ err_mem:
+ kfree(spa_map);
+ return NULL;
+}
+
+/**
+ * nfit_spa_map - interleave-aware managed-mappings of acpi_nfit_system_address ranges
+ * @nvdimm_bus: NFIT-bus that provided the spa table entry
+ * @nfit_spa: spa table to map
+ *
+ * In the case where block-data-window apertures and
+ * dimm-control-regions are interleaved they will end up sharing a
+ * single request_mem_region() + ioremap() for the address range. In
+ * the style of devm nfit_spa_map() mappings are automatically dropped
+ * when all region devices referencing the same mapping are disabled /
+ * unbound.
+ */
+static void __iomem *nfit_spa_map(struct acpi_nfit_desc *acpi_desc,
+ struct acpi_nfit_system_address *spa)
+{
+ void __iomem *iomem;
+
+ mutex_lock(&acpi_desc->spa_map_mutex);
+ iomem = __nfit_spa_map(acpi_desc, spa);
+ mutex_unlock(&acpi_desc->spa_map_mutex);
+
+ return iomem;
+}
+
+static int nfit_blk_init_interleave(struct nfit_blk_mmio *mmio,
+ struct acpi_nfit_interleave *idt, u16 interleave_ways)
+{
+ if (idt) {
+ mmio->num_lines = idt->line_count;
+ mmio->line_size = idt->line_size;
+ if (interleave_ways == 0)
+ return -ENXIO;
+ mmio->table_size = mmio->num_lines * interleave_ways
+ * mmio->line_size;
+ }
+
+ return 0;
+}
+
+static int acpi_nfit_blk_region_enable(struct nvdimm_bus *nvdimm_bus, struct device *dev)
+{
+ struct nvdimm_bus_descriptor *nd_desc = to_nd_desc(nvdimm_bus);
+ struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc);
+ struct nd_blk_region *ndbr = to_nd_blk_region(dev);
+ struct nfit_blk_mmio *mmio;
+ struct nfit_blk *nfit_blk;
+ struct nfit_mem *nfit_mem;
+ struct nvdimm *nvdimm;
+ int rc;
+
+ nvdimm = nd_blk_region_to_dimm(ndbr);
+ nfit_mem = nvdimm_provider_data(nvdimm);
+ if (!nfit_mem || !nfit_mem->dcr || !nfit_mem->bdw) {
+ dev_dbg(dev, "%s: missing%s%s%s\n", __func__,
+ nfit_mem ? "" : " nfit_mem",
+ nfit_mem->dcr ? "" : " dcr",
+ nfit_mem->bdw ? "" : " bdw");
+ return -ENXIO;
+ }
+
+ nfit_blk = devm_kzalloc(dev, sizeof(*nfit_blk), GFP_KERNEL);
+ if (!nfit_blk)
+ return -ENOMEM;
+ nd_blk_region_set_provider_data(ndbr, nfit_blk);
+ nfit_blk->nd_region = to_nd_region(dev);
+
+ /* map block aperture memory */
+ nfit_blk->bdw_offset = nfit_mem->bdw->offset;
+ mmio = &nfit_blk->mmio[BDW];
+ mmio->base = nfit_spa_map(acpi_desc, nfit_mem->spa_bdw);
+ if (!mmio->base) {
+ dev_dbg(dev, "%s: %s failed to map bdw\n", __func__,
+ nvdimm_name(nvdimm));
+ return -ENOMEM;
+ }
+ mmio->size = nfit_mem->bdw->size;
+ mmio->base_offset = nfit_mem->memdev_bdw->region_offset;
+ mmio->idt = nfit_mem->idt_bdw;
+ mmio->spa = nfit_mem->spa_bdw;
+ rc = nfit_blk_init_interleave(mmio, nfit_mem->idt_bdw,
+ nfit_mem->memdev_bdw->interleave_ways);
+ if (rc) {
+ dev_dbg(dev, "%s: %s failed to init bdw interleave\n",
+ __func__, nvdimm_name(nvdimm));
+ return rc;
+ }
+
+ /* map block control memory */
+ nfit_blk->cmd_offset = nfit_mem->dcr->command_offset;
+ nfit_blk->stat_offset = nfit_mem->dcr->status_offset;
+ mmio = &nfit_blk->mmio[DCR];
+ mmio->base = nfit_spa_map(acpi_desc, nfit_mem->spa_dcr);
+ if (!mmio->base) {
+ dev_dbg(dev, "%s: %s failed to map dcr\n", __func__,
+ nvdimm_name(nvdimm));
+ return -ENOMEM;
+ }
+ mmio->size = nfit_mem->dcr->window_size;
+ mmio->base_offset = nfit_mem->memdev_dcr->region_offset;
+ mmio->idt = nfit_mem->idt_dcr;
+ mmio->spa = nfit_mem->spa_dcr;
+ rc = nfit_blk_init_interleave(mmio, nfit_mem->idt_dcr,
+ nfit_mem->memdev_dcr->interleave_ways);
+ if (rc) {
+ dev_dbg(dev, "%s: %s failed to init dcr interleave\n",
+ __func__, nvdimm_name(nvdimm));
+ return rc;
+ }
+
+ if (mmio->line_size == 0)
+ return 0;
+
+ if ((u32) nfit_blk->cmd_offset % mmio->line_size + 8 > mmio->line_size) {
+ dev_dbg(dev, "cmd_offset crosses interleave boundary\n");
+ return -ENXIO;
+ } else if ((u32) nfit_blk->stat_offset % mmio->line_size + 8 > mmio->line_size) {
+ dev_dbg(dev, "stat_offset crosses interleave boundary\n");
+ return -ENXIO;
+ }
+
+ return 0;
+}
+
+static void acpi_nfit_blk_region_disable(struct nvdimm_bus *nvdimm_bus,
+ struct device *dev)
+{
+ struct nvdimm_bus_descriptor *nd_desc = to_nd_desc(nvdimm_bus);
+ struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc);
+ struct nd_blk_region *ndbr = to_nd_blk_region(dev);
+ struct nfit_blk *nfit_blk = nd_blk_region_provider_data(ndbr);
+ int i;
+
+ if (!nfit_blk)
+ return; /* never enabled */
+
+ /* auto-free BLK spa mappings */
+ for (i = 0; i < 2; i++) {
+ struct nfit_blk_mmio *mmio = &nfit_blk->mmio[i];
+
+ if (mmio->base)
+ nfit_spa_unmap(acpi_desc, mmio->spa);
+ }
+ nd_blk_region_set_provider_data(ndbr, NULL);
+ /* devm will free nfit_blk */
+}
+
static int acpi_nfit_register_region(struct acpi_nfit_desc *acpi_desc,
struct nfit_spa *nfit_spa)
{
static struct nd_mapping nd_mappings[ND_MAX_MAPPINGS];
struct acpi_nfit_system_address *spa = nfit_spa->spa;
+ struct nd_blk_region_desc ndbr_desc;
+ struct nd_region_desc *ndr_desc;
struct nfit_memdev *nfit_memdev;
- struct nd_region_desc ndr_desc;
int spa_type, count = 0, rc;
struct resource res;
u16 range_index;
@@ -850,12 +1246,13 @@ static int acpi_nfit_register_region(struct acpi_nfit_desc *acpi_desc,
memset(&res, 0, sizeof(res));
memset(&nd_mappings, 0, sizeof(nd_mappings));
- memset(&ndr_desc, 0, sizeof(ndr_desc));
+ memset(&ndbr_desc, 0, sizeof(ndr_desc));
res.start = spa->address;
res.end = res.start + spa->length - 1;
- ndr_desc.res = &res;
- ndr_desc.provider_data = nfit_spa;
- ndr_desc.attr_groups = acpi_nfit_region_attribute_groups;
+ ndr_desc = &ndbr_desc.ndr_desc;
+ ndr_desc->res = &res;
+ ndr_desc->provider_data = nfit_spa;
+ ndr_desc->attr_groups = acpi_nfit_region_attribute_groups;
list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) {
struct acpi_nfit_memory_map *memdev = nfit_memdev->memdev;
struct nd_mapping *nd_mapping;
@@ -891,26 +1288,31 @@ static int acpi_nfit_register_region(struct acpi_nfit_desc *acpi_desc,
} else {
nd_mapping->size = nfit_mem->bdw->capacity;
nd_mapping->start = nfit_mem->bdw->start_address;
- ndr_desc.num_lanes = nfit_mem->bdw->windows;
+ ndr_desc->num_lanes = nfit_mem->bdw->windows;
}
- ndr_desc.nd_mapping = nd_mapping;
- ndr_desc.num_mappings = blk_valid;
- if (!nvdimm_blk_region_create(acpi_desc->nvdimm_bus, &ndr_desc))
+ ndr_desc->nd_mapping = nd_mapping;
+ ndr_desc->num_mappings = blk_valid;
+ ndbr_desc.enable = acpi_nfit_blk_region_enable;
+ ndbr_desc.disable = acpi_nfit_blk_region_disable;
+ ndbr_desc.do_io = acpi_nfit_blk_region_do_io;
+ if (!nvdimm_blk_region_create(acpi_desc->nvdimm_bus,
+ ndr_desc))
return -ENOMEM;
}
}
- ndr_desc.nd_mapping = nd_mappings;
- ndr_desc.num_mappings = count;
- rc = acpi_nfit_init_interleave_set(acpi_desc, &ndr_desc, spa);
+ ndr_desc->nd_mapping = nd_mappings;
+ ndr_desc->num_mappings = count;
+ rc = acpi_nfit_init_interleave_set(acpi_desc, ndr_desc, spa);
if (rc)
return rc;
if (spa_type == NFIT_SPA_PM) {
- if (!nvdimm_pmem_region_create(acpi_desc->nvdimm_bus, &ndr_desc))
+ if (!nvdimm_pmem_region_create(acpi_desc->nvdimm_bus, ndr_desc))
return -ENOMEM;
} else if (spa_type == NFIT_SPA_VOLATILE) {
- if (!nvdimm_volatile_region_create(acpi_desc->nvdimm_bus, &ndr_desc))
+ if (!nvdimm_volatile_region_create(acpi_desc->nvdimm_bus,
+ ndr_desc))
return -ENOMEM;
}
return 0;
@@ -936,11 +1338,14 @@ static int acpi_nfit_init(struct acpi_nfit_desc *acpi_desc, acpi_size sz)
u8 *data;
int rc;
+ INIT_LIST_HEAD(&acpi_desc->spa_maps);
INIT_LIST_HEAD(&acpi_desc->spas);
INIT_LIST_HEAD(&acpi_desc->dcrs);
INIT_LIST_HEAD(&acpi_desc->bdws);
+ INIT_LIST_HEAD(&acpi_desc->idts);
INIT_LIST_HEAD(&acpi_desc->memdevs);
INIT_LIST_HEAD(&acpi_desc->dimms);
+ mutex_init(&acpi_desc->spa_map_mutex);
data = (u8 *) acpi_desc->nfit;
end = data + sz;
diff --git a/drivers/acpi/nfit.h b/drivers/acpi/nfit.h
index 3a87042aec77..b2e56becc8fd 100644
--- a/drivers/acpi/nfit.h
+++ b/drivers/acpi/nfit.h
@@ -52,6 +52,11 @@ struct nfit_bdw {
struct list_head list;
};
+struct nfit_idt {
+ struct acpi_nfit_interleave *idt;
+ struct list_head list;
+};
+
struct nfit_memdev {
struct acpi_nfit_memory_map *memdev;
struct list_head list;
@@ -62,10 +67,13 @@ struct nfit_mem {
struct nvdimm *nvdimm;
struct acpi_nfit_memory_map *memdev_dcr;
struct acpi_nfit_memory_map *memdev_pmem;
+ struct acpi_nfit_memory_map *memdev_bdw;
struct acpi_nfit_control_region *dcr;
struct acpi_nfit_data_region *bdw;
struct acpi_nfit_system_address *spa_dcr;
struct acpi_nfit_system_address *spa_bdw;
+ struct acpi_nfit_interleave *idt_dcr;
+ struct acpi_nfit_interleave *idt_bdw;
struct list_head list;
struct acpi_device *adev;
unsigned long dsm_mask;
@@ -74,16 +82,57 @@ struct nfit_mem {
struct acpi_nfit_desc {
struct nvdimm_bus_descriptor nd_desc;
struct acpi_table_nfit *nfit;
+ struct mutex spa_map_mutex;
+ struct list_head spa_maps;
struct list_head memdevs;
struct list_head dimms;
struct list_head spas;
struct list_head dcrs;
struct list_head bdws;
+ struct list_head idts;
struct nvdimm_bus *nvdimm_bus;
struct device *dev;
unsigned long dimm_dsm_force_en;
};
+enum nd_blk_mmio_selector {
+ BDW,
+ DCR,
+};
+
+struct nfit_blk {
+ struct nfit_blk_mmio {
+ union {
+ void __iomem *base;
+ void *aperture;
+ };
+ u64 size;
+ u64 base_offset;
+ u32 line_size;
+ u32 num_lines;
+ u32 table_size;
+ struct acpi_nfit_interleave *idt;
+ struct acpi_nfit_system_address *spa;
+ } mmio[2];
+ struct nd_region *nd_region;
+ u64 bdw_offset; /* post interleave offset */
+ u64 stat_offset;
+ u64 cmd_offset;
+};
+
+struct nfit_spa_mapping {
+ struct acpi_nfit_desc *acpi_desc;
+ struct acpi_nfit_system_address *spa;
+ struct list_head list;
+ struct kref kref;
+ void __iomem *iomem;
+};
+
+static inline struct nfit_spa_mapping *to_spa_map(struct kref *kref)
+{
+ return container_of(kref, struct nfit_spa_mapping, kref);
+}
+
static inline struct acpi_nfit_memory_map *__to_nfit_memdev(struct nfit_mem *nfit_mem)
{
if (nfit_mem->memdev_dcr)
diff --git a/drivers/nvdimm/Kconfig b/drivers/nvdimm/Kconfig
index da7037c018e6..b134f0a2f9a7 100644
--- a/drivers/nvdimm/Kconfig
+++ b/drivers/nvdimm/Kconfig
@@ -34,6 +34,19 @@ config BLK_DEV_PMEM
Say Y if you want to use a NVDIMM described by ACPI, E820, etc...
+config ND_BLK
+ tristate "BLK: Block data window (aperture) device support"
+ depends on LIBNVDIMM
+ default LIBNVDIMM
+ help
+ Support NVDIMMs, or other devices, that implement a BLK-mode
+ access capability. BLK-mode access uses memory-mapped-i/o
+ apertures to access persistent media.
+
+ Say Y if your platform firmware emits an ACPI.NFIT table
+ (CONFIG_ACPI_NFIT), or otherwise exposes BLK-mode
+ capabilities.
+
config ND_BTT_DEVS
bool
diff --git a/drivers/nvdimm/Makefile b/drivers/nvdimm/Makefile
index aa5bb1acf831..b5682e70904a 100644
--- a/drivers/nvdimm/Makefile
+++ b/drivers/nvdimm/Makefile
@@ -1,11 +1,14 @@
obj-$(CONFIG_LIBNVDIMM) += libnvdimm.o
obj-$(CONFIG_BLK_DEV_PMEM) += nd_pmem.o
obj-$(CONFIG_ND_BTT) += nd_btt.o
+obj-$(CONFIG_ND_BLK) += nd_blk.o
nd_pmem-y := pmem.o
nd_btt-y := btt.o
+nd_blk-y := blk.o
+
libnvdimm-y := core.o
libnvdimm-y += bus.o
libnvdimm-y += dimm_devs.o
diff --git a/drivers/nvdimm/blk.c b/drivers/nvdimm/blk.c
new file mode 100644
index 000000000000..37b6f52fe1c2
--- /dev/null
+++ b/drivers/nvdimm/blk.c
@@ -0,0 +1,252 @@
+/*
+ * NVDIMM Block Window Driver
+ * Copyright (c) 2014, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ */
+
+#include <linux/blkdev.h>
+#include <linux/fs.h>
+#include <linux/genhd.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/nd.h>
+#include <linux/sizes.h>
+#include "nd.h"
+
+struct nd_blk_device {
+ struct request_queue *queue;
+ struct gendisk *disk;
+ struct nd_namespace_blk *nsblk;
+ struct nd_blk_region *ndbr;
+ struct nd_io ndio;
+ size_t disk_size;
+};
+
+static int nd_blk_major;
+
+static resource_size_t to_dev_offset(struct nd_namespace_blk *nsblk,
+ resource_size_t ns_offset, unsigned int len)
+{
+ int i;
+
+ for (i = 0; i < nsblk->num_resources; i++) {
+ if (ns_offset < resource_size(nsblk->res[i])) {
+ if (ns_offset + len > resource_size(nsblk->res[i])) {
+ dev_WARN_ONCE(&nsblk->dev, 1,
+ "%s: illegal request\n", __func__);
+ return SIZE_MAX;
+ }
+ return nsblk->res[i]->start + ns_offset;
+ }
+ ns_offset -= resource_size(nsblk->res[i]);
+ }
+
+ dev_WARN_ONCE(&nsblk->dev, 1, "%s: request out of range\n", __func__);
+ return SIZE_MAX;
+}
+
+static void nd_blk_make_request(struct request_queue *q, struct bio *bio)
+{
+ struct block_device *bdev = bio->bi_bdev;
+ struct gendisk *disk = bdev->bd_disk;
+ struct nd_namespace_blk *nsblk;
+ struct nd_blk_device *blk_dev;
+ struct nd_blk_region *ndbr;
+ struct bvec_iter iter;
+ struct bio_vec bvec;
+ int err = 0, rw;
+ sector_t sector;
+
+ sector = bio->bi_iter.bi_sector;
+ if (bio_end_sector(bio) > get_capacity(disk)) {
+ err = -EIO;
+ goto out;
+ }
+
+ BUG_ON(bio->bi_rw & REQ_DISCARD);
+
+ rw = bio_data_dir(bio);
+
+ blk_dev = disk->private_data;
+ nsblk = blk_dev->nsblk;
+ ndbr = blk_dev->ndbr;
+ bio_for_each_segment(bvec, bio, iter) {
+ unsigned int len = bvec.bv_len;
+ resource_size_t dev_offset;
+ void *iobuf;
+
+ BUG_ON(len > PAGE_SIZE);
+
+ dev_offset = to_dev_offset(nsblk, sector << SECTOR_SHIFT, len);
+ if (dev_offset == SIZE_MAX) {
+ err = -EIO;
+ goto out;
+ }
+
+ iobuf = kmap_atomic(bvec.bv_page);
+ err = ndbr->do_io(ndbr, iobuf + bvec.bv_offset, len, rw, dev_offset);
+ kunmap_atomic(iobuf);
+ if (err)
+ goto out;
+
+ sector += len >> SECTOR_SHIFT;
+ }
+
+ out:
+ bio_endio(bio, err);
+}
+
+static int nd_blk_rw_bytes(struct nd_io *ndio, void *iobuf, size_t offset,
+ size_t n, unsigned long flags)
+{
+ struct nd_namespace_blk *nsblk;
+ struct nd_blk_device *blk_dev;
+ int rw = nd_data_dir(flags);
+ struct nd_blk_region *ndbr;
+ resource_size_t dev_offset;
+
+ blk_dev = container_of(ndio, typeof(*blk_dev), ndio);
+ ndbr = blk_dev->ndbr;
+ nsblk = blk_dev->nsblk;
+ dev_offset = to_dev_offset(nsblk, offset, n);
+
+ if (unlikely(offset + n > blk_dev->disk_size)) {
+ dev_WARN_ONCE(ndio->dev, 1, "%s: request out of range\n",
+ __func__);
+ return -EFAULT;
+ }
+
+ if (dev_offset == SIZE_MAX)
+ return -EIO;
+
+ return ndbr->do_io(ndbr, iobuf, n, rw, dev_offset);
+}
+
+static const struct block_device_operations nd_blk_fops = {
+ .owner = THIS_MODULE,
+};
+
+static int nd_blk_probe(struct device *dev)
+{
+ struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
+ struct nd_region *nd_region = to_nd_region(dev->parent);
+ struct nd_blk_device *blk_dev;
+ resource_size_t disk_size;
+ struct gendisk *disk;
+ int err;
+
+ disk_size = nd_namespace_blk_validate(nsblk);
+ if (disk_size < ND_MIN_NAMESPACE_SIZE)
+ return -ENXIO;
+
+ blk_dev = kzalloc(sizeof(*blk_dev), GFP_KERNEL);
+ if (!blk_dev)
+ return -ENOMEM;
+
+ blk_dev->disk_size = disk_size;
+
+ blk_dev->queue = blk_alloc_queue(GFP_KERNEL);
+ if (!blk_dev->queue) {
+ err = -ENOMEM;
+ goto err_alloc_queue;
+ }
+
+ blk_queue_make_request(blk_dev->queue, nd_blk_make_request);
+ blk_queue_max_hw_sectors(blk_dev->queue, 1024);
+ blk_queue_bounce_limit(blk_dev->queue, BLK_BOUNCE_ANY);
+ blk_queue_logical_block_size(blk_dev->queue, nsblk->lbasize);
+
+ disk = blk_dev->disk = alloc_disk(0);
+ if (!disk) {
+ err = -ENOMEM;
+ goto err_alloc_disk;
+ }
+
+ blk_dev->ndbr = to_nd_blk_region(nsblk->dev.parent);
+ blk_dev->nsblk = nsblk;
+
+ disk->driverfs_dev = dev;
+ disk->major = nd_blk_major;
+ disk->first_minor = 0;
+ disk->fops = &nd_blk_fops;
+ disk->private_data = blk_dev;
+ disk->queue = blk_dev->queue;
+ disk->flags = GENHD_FL_EXT_DEVT;
+ sprintf(disk->disk_name, "ndblk%d.%d", nd_region->id, nsblk->id);
+ set_capacity(disk, disk_size >> SECTOR_SHIFT);
+
+ nvdimm_bus_lock(dev);
+ dev_set_drvdata(dev, blk_dev);
+
+ add_disk(disk);
+ nd_init_ndio(&blk_dev->ndio, nd_blk_rw_bytes, dev, disk, 0);
+ nd_register_ndio(&blk_dev->ndio);
+ nvdimm_bus_unlock(dev);
+
+ return 0;
+
+ err_alloc_disk:
+ blk_cleanup_queue(blk_dev->queue);
+ err_alloc_queue:
+ kfree(blk_dev);
+ return err;
+}
+
+static int nd_blk_remove(struct device *dev)
+{
+ struct nd_blk_device *blk_dev = dev_get_drvdata(dev);
+
+ nd_unregister_ndio(&blk_dev->ndio);
+ del_gendisk(blk_dev->disk);
+ put_disk(blk_dev->disk);
+ blk_cleanup_queue(blk_dev->queue);
+ kfree(blk_dev);
+
+ return 0;
+}
+
+static struct nd_device_driver nd_blk_driver = {
+ .probe = nd_blk_probe,
+ .remove = nd_blk_remove,
+ .drv = {
+ .name = "nd_blk",
+ },
+ .type = ND_DRIVER_NAMESPACE_BLK,
+};
+
+static int __init nd_blk_init(void)
+{
+ int rc;
+
+ rc = register_blkdev(0, "nd_blk");
+ if (rc < 0)
+ return rc;
+
+ nd_blk_major = rc;
+ rc = nd_driver_register(&nd_blk_driver);
+
+ if (rc < 0)
+ unregister_blkdev(nd_blk_major, "nd_blk");
+
+ return rc;
+}
+
+static void __exit nd_blk_exit(void)
+{
+ driver_unregister(&nd_blk_driver.drv);
+ unregister_blkdev(nd_blk_major, "nd_blk");
+}
+
+MODULE_AUTHOR("Ross Zwisler <ross.zwisler@linux.intel.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS_ND_DEVICE(ND_DEVICE_NAMESPACE_BLK);
+module_init(nd_blk_init);
+module_exit(nd_blk_exit);
diff --git a/drivers/nvdimm/dimm_devs.c b/drivers/nvdimm/dimm_devs.c
index 38fb68af5ef9..ae5f7fb8ce38 100644
--- a/drivers/nvdimm/dimm_devs.c
+++ b/drivers/nvdimm/dimm_devs.c
@@ -209,6 +209,15 @@ struct nvdimm *to_nvdimm(struct device *dev)
}
EXPORT_SYMBOL_GPL(to_nvdimm);
+struct nvdimm *nd_blk_region_to_dimm(struct nd_blk_region *ndbr)
+{
+ struct nd_region *nd_region = &ndbr->nd_region;
+ struct nd_mapping *nd_mapping = &nd_region->mapping[0];
+
+ return nd_mapping->nvdimm;
+}
+EXPORT_SYMBOL_GPL(nd_blk_region_to_dimm);
+
struct nvdimm_drvdata *to_ndd(struct nd_mapping *nd_mapping)
{
struct nvdimm *nvdimm = nd_mapping->nvdimm;
diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c
index 893eefafb940..ab71b454a020 100644
--- a/drivers/nvdimm/namespace_devs.c
+++ b/drivers/nvdimm/namespace_devs.c
@@ -151,6 +151,53 @@ static resource_size_t nd_namespace_blk_size(struct nd_namespace_blk *nsblk)
return size;
}
+resource_size_t nd_namespace_blk_validate(struct nd_namespace_blk *nsblk)
+{
+ struct nd_region *nd_region = to_nd_region(nsblk->dev.parent);
+ struct nd_mapping *nd_mapping = &nd_region->mapping[0];
+ struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
+ struct nd_label_id label_id;
+ struct resource *res;
+ int count, i;
+
+ if (!nsblk->uuid || !nsblk->lbasize)
+ return 0;
+
+ count = 0;
+ nd_label_gen_id(&label_id, nsblk->uuid, NSLABEL_FLAG_LOCAL);
+ for_each_dpa_resource(ndd, res) {
+ if (strcmp(res->name, label_id.id) != 0)
+ continue;
+ /*
+ * Resources with unacknoweldged adjustments indicate a
+ * failure to update labels
+ */
+ if (res->flags & DPA_RESOURCE_ADJUSTED)
+ return 0;
+ count++;
+ }
+
+ /* These values match after a successful label update */
+ if (count != nsblk->num_resources)
+ return 0;
+
+ for (i = 0; i < nsblk->num_resources; i++) {
+ struct resource *found = NULL;
+
+ for_each_dpa_resource(ndd, res)
+ if (res == nsblk->res[i]) {
+ found = res;
+ break;
+ }
+ /* stale resource */
+ if (!found)
+ return 0;
+ }
+
+ return nd_namespace_blk_size(nsblk);
+}
+EXPORT_SYMBOL(nd_namespace_blk_validate);
+
static int nd_namespace_label_update(struct nd_region *nd_region, struct device *dev)
{
dev_WARN_ONCE(dev, dev->driver,
diff --git a/drivers/nvdimm/nd-private.h b/drivers/nvdimm/nd-private.h
index 635af040023f..89633ce4774a 100644
--- a/drivers/nvdimm/nd-private.h
+++ b/drivers/nvdimm/nd-private.h
@@ -23,7 +23,6 @@ extern struct list_head nvdimm_bus_list;
extern struct mutex nvdimm_bus_list_mutex;
extern int nvdimm_major;
-struct block_device;
struct nd_io_claim;
struct nd_btt;
struct nd_io;
@@ -51,8 +50,8 @@ struct nvdimm {
struct nd_io *ndio_lookup(struct nvdimm_bus *nvdimm_bus, const char *diskname);
bool is_nvdimm(struct device *dev);
-bool is_nd_blk(struct device *dev);
bool is_nd_pmem(struct device *dev);
+bool is_nd_blk(struct device *dev);
#if IS_ENABLED(CONFIG_ND_BTT_DEVS)
bool is_nd_btt(struct device *dev);
struct nd_btt *nd_btt_create(struct nvdimm_bus *nvdimm_bus);
diff --git a/drivers/nvdimm/nd.h b/drivers/nvdimm/nd.h
index 2bea91d270cc..c807379d9653 100644
--- a/drivers/nvdimm/nd.h
+++ b/drivers/nvdimm/nd.h
@@ -113,6 +113,15 @@ struct nd_region {
struct nd_mapping mapping[0];
};
+struct nd_blk_region {
+ int (*enable)(struct nvdimm_bus *nvdimm_bus, struct device *dev);
+ void (*disable)(struct nvdimm_bus *nvdimm_bus, struct device *dev);
+ int (*do_io)(struct nd_blk_region *ndbr, void *iobuf, u64 len,
+ int write, resource_size_t dpa);
+ void *blk_provider_data;
+ struct nd_region nd_region;
+};
+
/*
* Lookup next in the repeating sequence of 01, 10, and 11.
*/
@@ -236,8 +245,6 @@ struct nd_btt *to_nd_btt(struct device *dev);
struct btt_sb;
u64 nd_btt_sb_checksum(struct btt_sb *btt_sb);
struct nd_region *to_nd_region(struct device *dev);
-unsigned int nd_region_acquire_lane(struct nd_region *nd_region);
-void nd_region_release_lane(struct nd_region *nd_region, unsigned int lane);
int nd_region_to_namespace_type(struct nd_region *nd_region);
int nd_region_register_namespaces(struct nd_region *nd_region, int *err);
u64 nd_region_interleave_set_cookie(struct nd_region *nd_region);
@@ -249,4 +256,6 @@ void nvdimm_free_dpa(struct nvdimm_drvdata *ndd, struct resource *res);
struct resource *nvdimm_allocate_dpa(struct nvdimm_drvdata *ndd,
struct nd_label_id *label_id, resource_size_t start,
resource_size_t n);
+int nd_blk_region_init(struct nd_region *nd_region);
+resource_size_t nd_namespace_blk_validate(struct nd_namespace_blk *nsblk);
#endif /* __ND_H__ */
diff --git a/drivers/nvdimm/region.c b/drivers/nvdimm/region.c
index aa617bf86506..d9d82e7a90fa 100644
--- a/drivers/nvdimm/region.c
+++ b/drivers/nvdimm/region.c
@@ -94,11 +94,10 @@ EXPORT_SYMBOL(nd_region_release_lane);
static int nd_region_probe(struct device *dev)
{
- int err;
+ int err, rc;
static unsigned long once;
struct nd_region_namespaces *num_ns;
struct nd_region *nd_region = to_nd_region(dev);
- int rc = nd_region_register_namespaces(nd_region, &err);
if (nd_region->num_lanes > num_online_cpus()
&& nd_region->num_lanes < num_possible_cpus()
@@ -110,6 +109,11 @@ static int nd_region_probe(struct device *dev)
nd_region->num_lanes);
}
+ rc = nd_blk_region_init(nd_region);
+ if (rc)
+ return rc;
+
+ rc = nd_region_register_namespaces(nd_region, &err);
num_ns = devm_kzalloc(dev, sizeof(*num_ns), GFP_KERNEL);
if (!num_ns)
return -ENOMEM;
diff --git a/drivers/nvdimm/region_devs.c b/drivers/nvdimm/region_devs.c
index 1274f9300002..5790aec081f4 100644
--- a/drivers/nvdimm/region_devs.c
+++ b/drivers/nvdimm/region_devs.c
@@ -11,6 +11,7 @@
* General Public License for more details.
*/
#include <linux/scatterlist.h>
+#include <linux/highmem.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/sort.h>
@@ -33,7 +34,10 @@ static void nd_region_release(struct device *dev)
put_device(&nvdimm->dev);
}
ida_simple_remove(®ion_ida, nd_region->id);
- kfree(nd_region);
+ if (is_nd_blk(dev))
+ kfree(to_nd_blk_region(dev));
+ else
+ kfree(nd_region);
}
static struct device_type nd_blk_device_type = {
@@ -70,6 +74,33 @@ struct nd_region *to_nd_region(struct device *dev)
}
EXPORT_SYMBOL_GPL(to_nd_region);
+struct nd_blk_region *to_nd_blk_region(struct device *dev)
+{
+ struct nd_region *nd_region = to_nd_region(dev);
+
+ WARN_ON(!is_nd_blk(dev));
+ return container_of(nd_region, struct nd_blk_region, nd_region);
+}
+EXPORT_SYMBOL_GPL(to_nd_blk_region);
+
+void *nd_region_provider_data(struct nd_region *nd_region)
+{
+ return nd_region->provider_data;
+}
+EXPORT_SYMBOL_GPL(nd_region_provider_data);
+
+void *nd_blk_region_provider_data(struct nd_blk_region *ndbr)
+{
+ return ndbr->blk_provider_data;
+}
+EXPORT_SYMBOL_GPL(nd_blk_region_provider_data);
+
+void nd_blk_region_set_provider_data(struct nd_blk_region *ndbr, void *data)
+{
+ ndbr->blk_provider_data = data;
+}
+EXPORT_SYMBOL_GPL(nd_blk_region_set_provider_data);
+
/**
* nd_region_to_namespace_type() - region to an integer namespace type
* @nd_region: region-device to interrogate
@@ -344,14 +375,13 @@ u64 nd_region_interleave_set_cookie(struct nd_region *nd_region)
/*
* Upon successful probe/remove, take/release a reference on the
- * associated interleave set (if present)
+ * associated dimms in the interleave set, on successful probe of a BLK
+ * namespace check if we need a new seed, and on remove or failed probe
+ * of a BLK region notify the provider to disable the region.
*/
static void nd_region_notify_driver_action(struct nvdimm_bus *nvdimm_bus,
struct device *dev, int rc, bool probe)
{
- if (rc)
- return;
-
if (is_nd_pmem(dev) || is_nd_blk(dev)) {
struct nd_region *nd_region = to_nd_region(dev);
int i;
@@ -360,11 +390,16 @@ static void nd_region_notify_driver_action(struct nvdimm_bus *nvdimm_bus,
struct nd_mapping *nd_mapping = &nd_region->mapping[i];
struct nvdimm *nvdimm = nd_mapping->nvdimm;
- if (probe)
+ if (probe && rc == 0)
atomic_inc(&nvdimm->busy);
- else
+ else if (!probe)
atomic_dec(&nvdimm->busy);
}
+
+ if (is_nd_pmem(dev) || (probe && rc == 0))
+ return;
+
+ to_nd_blk_region(dev)->disable(nvdimm_bus, dev);
} else if (dev->parent && is_nd_blk(dev->parent) && probe && rc == 0) {
struct nd_region *nd_region = to_nd_region(dev->parent);
@@ -508,11 +543,21 @@ struct attribute_group nd_mapping_attribute_group = {
};
EXPORT_SYMBOL_GPL(nd_mapping_attribute_group);
-void *nd_region_provider_data(struct nd_region *nd_region)
+int nd_blk_region_init(struct nd_region *nd_region)
{
- return nd_region->provider_data;
+ struct device *dev = &nd_region->dev;
+ struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
+
+ if (!is_nd_blk(dev))
+ return 0;
+
+ if (nd_region->ndr_mappings < 1) {
+ dev_err(dev, "invalid BLK region\n");
+ return -ENXIO;
+ }
+
+ return to_nd_blk_region(dev)->enable(nvdimm_bus, dev);
}
-EXPORT_SYMBOL_GPL(nd_region_provider_data);
static noinline struct nd_region *nd_region_create(struct nvdimm_bus *nvdimm_bus,
struct nd_region_desc *ndr_desc, struct device_type *dev_type)
@@ -534,9 +579,28 @@ static noinline struct nd_region *nd_region_create(struct nvdimm_bus *nvdimm_bus
}
}
- nd_region = kzalloc(sizeof(struct nd_region)
- + sizeof(struct nd_mapping) * ndr_desc->num_mappings,
- GFP_KERNEL);
+ if (dev_type == &nd_blk_device_type) {
+ struct nd_blk_region_desc *ndbr_desc;
+ struct nd_blk_region *ndbr;
+
+ ndbr_desc = container_of(ndr_desc, typeof(*ndbr_desc), ndr_desc);
+ ndbr = kzalloc(sizeof(*ndbr) + sizeof(struct nd_mapping)
+ * ndr_desc->num_mappings,
+ GFP_KERNEL);
+ if (ndbr) {
+ nd_region = &ndbr->nd_region;
+ ndbr->enable = ndbr_desc->enable;
+ ndbr->disable = ndbr_desc->disable;
+ ndbr->do_io = ndbr_desc->do_io;
+ } else
+ nd_region = NULL;
+ } else {
+ nd_region = kzalloc(sizeof(struct nd_region)
+ + sizeof(struct nd_mapping)
+ * ndr_desc->num_mappings,
+ GFP_KERNEL);
+ }
+
if (!nd_region)
return NULL;
nd_region->id = ida_simple_get(®ion_ida, 0, 0, GFP_KERNEL);
diff --git a/include/linux/libnvdimm.h b/include/linux/libnvdimm.h
index f97b6adf9653..96b950717fab 100644
--- a/include/linux/libnvdimm.h
+++ b/include/linux/libnvdimm.h
@@ -81,8 +81,17 @@ struct nd_region_desc {
};
struct nvdimm_bus;
-struct device;
struct module;
+struct device;
+struct nd_blk_region;
+struct nd_blk_region_desc {
+ int (*enable)(struct nvdimm_bus *nvdimm_bus, struct device *dev);
+ void (*disable)(struct nvdimm_bus *nvdimm_bus, struct device *dev);
+ int (*do_io)(struct nd_blk_region *ndbr, void *iobuf, u64 len,
+ int write, resource_size_t dpa);
+ struct nd_region_desc ndr_desc;
+};
+
struct nvdimm_bus *__nvdimm_bus_register(struct device *parent,
struct nvdimm_bus_descriptor *nfit_desc, struct module *module);
#define nvdimm_bus_register(parent, desc) \
@@ -91,10 +100,10 @@ void nvdimm_bus_unregister(struct nvdimm_bus *nvdimm_bus);
struct nvdimm_bus *to_nvdimm_bus(struct device *dev);
struct nvdimm *to_nvdimm(struct device *dev);
struct nd_region *to_nd_region(struct device *dev);
+struct nd_blk_region *to_nd_blk_region(struct device *dev);
struct nvdimm_bus_descriptor *to_nd_desc(struct nvdimm_bus *nvdimm_bus);
const char *nvdimm_name(struct nvdimm *nvdimm);
void *nvdimm_provider_data(struct nvdimm *nvdimm);
-void *nd_region_provider_data(struct nd_region *nd_region);
struct nvdimm *nvdimm_create(struct nvdimm_bus *nvdimm_bus, void *provider_data,
const struct attribute_group **groups, unsigned long flags,
unsigned long *dsm_mask);
@@ -112,5 +121,11 @@ struct nd_region *nvdimm_blk_region_create(struct nvdimm_bus *nvdimm_bus,
struct nd_region_desc *ndr_desc);
struct nd_region *nvdimm_volatile_region_create(struct nvdimm_bus *nvdimm_bus,
struct nd_region_desc *ndr_desc);
+void *nd_region_provider_data(struct nd_region *nd_region);
+void *nd_blk_region_provider_data(struct nd_blk_region *ndbr);
+void nd_blk_region_set_provider_data(struct nd_blk_region *ndbr, void *data);
+struct nvdimm *nd_blk_region_to_dimm(struct nd_blk_region *ndbr);
+unsigned int nd_region_acquire_lane(struct nd_region *nd_region);
+void nd_region_release_lane(struct nd_region *nd_region, unsigned int lane);
u64 nd_fletcher64(void *addr, size_t len, bool le);
#endif /* __LIBNVDIMM_H__ */
^ permalink raw reply related [flat|nested] 47+ messages in thread
* [PATCH v5 20/21] tools/testing/nvdimm: manufactured NFITs for interface development
2015-06-02 0:14 [PATCH v5 00/21] libnvdimm: non-volatile memory devices Dan Williams
` (18 preceding siblings ...)
2015-06-02 0:15 ` [PATCH v5 19/21] libnvdimm, nfit, nd_blk: driver for BLK-mode access persistent memory Dan Williams
@ 2015-06-02 0:15 ` Dan Williams
2015-06-09 6:48 ` Christoph Hellwig
2015-06-02 0:16 ` [PATCH v5 21/21] libnvdimm: Non-Volatile Devices Dan Williams
20 siblings, 1 reply; 47+ messages in thread
From: Dan Williams @ 2015-06-02 0:15 UTC (permalink / raw)
To: linux-nvdimm
Cc: axboe, sfr, rafael, neilb, gregkh, linux-kernel, mingo,
linux-acpi, jmoyer, linux-api, akpm, hch
Manually create and register NFITs to describe 2 topologies. Topology1
is an advanced plausible configuration for BLK/PMEM aliased NVDIMMs.
Topology2 is an example configuration for current platforms that only
ship with a persistent address range.
Kernel provider "nfit_test.0" produces an NFIT with the following attributes:
(a) (b) DIMM BLK-REGION
+-------------------+--------+--------+--------+
+------+ | pm0.0 | blk2.0 | pm1.0 | blk2.1 | 0 region2
| imc0 +--+- - - region0- - - +--------+ +--------+
+--+---+ | pm0.0 | blk3.0 | pm1.0 | blk3.1 | 1 region3
| +-------------------+--------v v--------+
+--+---+ | |
| cpu0 | region1
+--+---+ | |
| +----------------------------^ ^--------+
+--+---+ | blk4.0 | pm1.0 | blk4.0 | 2 region4
| imc1 +--+----------------------------| +--------+
+------+ | blk5.0 | pm1.0 | blk5.0 | 3 region5
+----------------------------+--------+--------+
*) In this layout we have four dimms and two memory controllers in one
socket. Each unique interface ("block" or "pmem") to DPA space
is identified by a region device with a dynamically assigned id.
*) The first portion of dimm0 and dimm1 are interleaved as REGION0.
A single "pmem" namespace is created in the REGION0-"spa"-range
that spans dimm0 and dimm1 with a user-specified name of "pm0.0".
Some of that interleaved "spa" range is reclaimed as "bdw"
accessed space starting at offset (a) into each dimm. In that
reclaimed space we create two "bdw" "namespaces" from REGION2 and
REGION3 where "blk2.0" and "blk3.0" are just human readable names
that could be set to any user-desired name in the label.
*) In the last portion of dimm0 and dimm1 we have an interleaved
"spa" range, REGION1, that spans those two dimms as well as dimm2
and dimm3. Some of REGION1 allocated to a "pmem" namespace named
"pm1.0" the rest is reclaimed in 4 "bdw" namespaces (for each
dimm in the interleave set), "blk2.1", "blk3.1", "blk4.0", and
"blk5.0".
*) The portion of dimm2 and dimm3 that do not participate in the
REGION1 interleaved "spa" range (i.e. the DPA address below
offset (b) are also included in the "blk4.0" and "blk5.0"
namespaces. Note, that this example shows that "bdw" namespaces
don't need to be contiguous in DPA-space.
Kernel provider "nfit_test.1" produces an NFIT with the following attributes:
region2
+---------------------+
|---------------------|
|| pm2.0 ||
|---------------------|
+---------------------+
*) Describes a simple system-physical-address range with no backing
dimm or interleave description.
Cc: <linux-acpi@vger.kernel.org>
Cc: Lv Zheng <lv.zheng@intel.com>
Cc: Robert Moore <robert.moore@intel.com>
Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
drivers/acpi/Makefile | 1
drivers/acpi/nfit.c | 14
drivers/acpi/nfit.h | 14
drivers/nvdimm/Makefile | 1
drivers/nvdimm/blk.c | 2
drivers/nvdimm/btt.c | 4
drivers/nvdimm/bus.c | 4
drivers/nvdimm/dimm.c | 4
drivers/nvdimm/label.c | 6
drivers/nvdimm/namespace_devs.c | 4
drivers/nvdimm/pmem.c | 2
drivers/nvdimm/region.c | 2
drivers/nvdimm/region_devs.c | 4
tools/testing/nvdimm/Kbuild | 37 +
tools/testing/nvdimm/Makefile | 7
tools/testing/nvdimm/test/Kbuild | 8
tools/testing/nvdimm/test/iomap.c | 151 +++++
tools/testing/nvdimm/test/nfit.c | 1101 +++++++++++++++++++++++++++++++++
tools/testing/nvdimm/test/nfit_test.h | 28 +
19 files changed, 1373 insertions(+), 21 deletions(-)
create mode 100644 tools/testing/nvdimm/Kbuild
create mode 100644 tools/testing/nvdimm/Makefile
create mode 100644 tools/testing/nvdimm/test/Kbuild
create mode 100644 tools/testing/nvdimm/test/iomap.c
create mode 100644 tools/testing/nvdimm/test/nfit.c
create mode 100644 tools/testing/nvdimm/test/nfit_test.h
diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
index f7e9c92ccdcb..f0f2103f8575 100644
--- a/drivers/acpi/Makefile
+++ b/drivers/acpi/Makefile
@@ -4,6 +4,7 @@
ccflags-y := -Os
ccflags-$(CONFIG_ACPI_DEBUG) += -DACPI_DEBUG_OUTPUT
+ccflags-y += -I$(src)
#
# ACPI Boot-Time Table Parsing
diff --git a/drivers/acpi/nfit.c b/drivers/acpi/nfit.c
index 1124c47f7b06..5731e4ab18a0 100644
--- a/drivers/acpi/nfit.c
+++ b/drivers/acpi/nfit.c
@@ -19,7 +19,7 @@
#include <linux/acpi.h>
#include <linux/sort.h>
#include <linux/io.h>
-#include "nfit.h"
+#include <nfit.h>
#include <asm-generic/io-64-nonatomic-hi-lo.h>
@@ -29,10 +29,11 @@ MODULE_PARM_DESC(force_enable_dimms, "Ignore _STA (ACPI DIMM device) status");
static u8 nfit_uuid[NFIT_UUID_MAX][16];
-static const u8 *to_nfit_uuid(enum nfit_uuids id)
+const u8 *to_nfit_uuid(enum nfit_uuids id)
{
return nfit_uuid[id];
}
+EXPORT_SYMBOL(to_nfit_uuid);
static struct acpi_nfit_desc *to_acpi_nfit_desc(struct nvdimm_bus_descriptor *nd_desc)
{
@@ -529,11 +530,12 @@ static struct attribute_group acpi_nfit_attribute_group = {
.attrs = acpi_nfit_attributes,
};
-static const struct attribute_group *acpi_nfit_attribute_groups[] = {
+const struct attribute_group *acpi_nfit_attribute_groups[] = {
&nvdimm_bus_attribute_group,
&acpi_nfit_attribute_group,
NULL,
};
+EXPORT_SYMBOL_GPL(acpi_nfit_attribute_groups);
static struct acpi_nfit_memory_map *to_nfit_memdev(struct device *dev)
{
@@ -1295,7 +1297,7 @@ static int acpi_nfit_register_region(struct acpi_nfit_desc *acpi_desc,
ndr_desc->num_mappings = blk_valid;
ndbr_desc.enable = acpi_nfit_blk_region_enable;
ndbr_desc.disable = acpi_nfit_blk_region_disable;
- ndbr_desc.do_io = acpi_nfit_blk_region_do_io;
+ ndbr_desc.do_io = acpi_desc->blk_do_io;
if (!nvdimm_blk_region_create(acpi_desc->nvdimm_bus,
ndr_desc))
return -ENOMEM;
@@ -1331,7 +1333,7 @@ static int acpi_nfit_register_regions(struct acpi_nfit_desc *acpi_desc)
return 0;
}
-static int acpi_nfit_init(struct acpi_nfit_desc *acpi_desc, acpi_size sz)
+int acpi_nfit_init(struct acpi_nfit_desc *acpi_desc, acpi_size sz)
{
struct device *dev = acpi_desc->dev;
const void *end;
@@ -1370,6 +1372,7 @@ static int acpi_nfit_init(struct acpi_nfit_desc *acpi_desc, acpi_size sz)
return acpi_nfit_register_regions(acpi_desc);
}
+EXPORT_SYMBOL_GPL(acpi_nfit_init);
static int acpi_nfit_add(struct acpi_device *adev)
{
@@ -1394,6 +1397,7 @@ static int acpi_nfit_add(struct acpi_device *adev)
dev_set_drvdata(dev, acpi_desc);
acpi_desc->dev = dev;
acpi_desc->nfit = (struct acpi_table_nfit *) tbl;
+ acpi_desc->blk_do_io = acpi_nfit_blk_region_do_io;
nd_desc = &acpi_desc->nd_desc;
nd_desc->provider_name = "ACPI.NFIT";
nd_desc->ndctl = acpi_nfit_ctl;
diff --git a/drivers/acpi/nfit.h b/drivers/acpi/nfit.h
index b2e56becc8fd..6cad6f2327b5 100644
--- a/drivers/acpi/nfit.h
+++ b/drivers/acpi/nfit.h
@@ -37,6 +37,15 @@ enum nfit_uuids {
NFIT_UUID_MAX,
};
+#define NFIT_DIMM_HANDLE(node, socket, imc, chan, dimm) \
+ (((node & 0xfff) << 16) | ((socket & 0xf) << 12) \
+ | ((imc & 0xf) << 8) | ((chan & 0xf) << 4) | (dimm & 0xf))
+#define NFIT_DIMM_NODE(handle) ((handle) >> 16 & 0xfff)
+#define NFIT_DIMM_SOCKET(handle) ((handle) >> 12 & 0xf)
+#define NFIT_DIMM_CHAN(handle) ((handle) >> 8 & 0xf)
+#define NFIT_DIMM_IMC(handle) ((handle) >> 4 & 0xf)
+#define NFIT_DIMM_DIMM(handle) ((handle) & 0xf)
+
struct nfit_spa {
struct acpi_nfit_system_address *spa;
struct list_head list;
@@ -93,6 +102,8 @@ struct acpi_nfit_desc {
struct nvdimm_bus *nvdimm_bus;
struct device *dev;
unsigned long dimm_dsm_force_en;
+ int (*blk_do_io)(struct nd_blk_region *ndbr, void *iobuf,
+ u64 len, int write, resource_size_t dpa);
};
enum nd_blk_mmio_selector {
@@ -144,4 +155,7 @@ static inline struct acpi_nfit_desc *to_acpi_desc(struct nvdimm_bus_descriptor *
{
return container_of(nd_desc, struct acpi_nfit_desc, nd_desc);
}
+
+const u8 *to_nfit_uuid(enum nfit_uuids id);
+int acpi_nfit_init(struct acpi_nfit_desc *nfit, acpi_size sz);
#endif /* __NFIT_H__ */
diff --git a/drivers/nvdimm/Makefile b/drivers/nvdimm/Makefile
index b5682e70904a..20afdb362260 100644
--- a/drivers/nvdimm/Makefile
+++ b/drivers/nvdimm/Makefile
@@ -1,3 +1,4 @@
+ccflags-y := -I$(src)
obj-$(CONFIG_LIBNVDIMM) += libnvdimm.o
obj-$(CONFIG_BLK_DEV_PMEM) += nd_pmem.o
obj-$(CONFIG_ND_BTT) += nd_btt.o
diff --git a/drivers/nvdimm/blk.c b/drivers/nvdimm/blk.c
index 37b6f52fe1c2..a958636df62c 100644
--- a/drivers/nvdimm/blk.c
+++ b/drivers/nvdimm/blk.c
@@ -19,7 +19,7 @@
#include <linux/moduleparam.h>
#include <linux/nd.h>
#include <linux/sizes.h>
-#include "nd.h"
+#include <nd.h>
struct nd_blk_device {
struct request_queue *queue;
diff --git a/drivers/nvdimm/btt.c b/drivers/nvdimm/btt.c
index 932177294f75..2d7ce9e9b624 100644
--- a/drivers/nvdimm/btt.c
+++ b/drivers/nvdimm/btt.c
@@ -23,8 +23,8 @@
#include <linux/ndctl.h>
#include <linux/fs.h>
#include <linux/nd.h>
-#include "btt.h"
-#include "nd.h"
+#include <btt.h>
+#include <nd.h>
enum log_ent_request {
LOG_NEW_ENT = 0,
diff --git a/drivers/nvdimm/bus.c b/drivers/nvdimm/bus.c
index 5c977c1306db..d8a1794733e2 100644
--- a/drivers/nvdimm/bus.c
+++ b/drivers/nvdimm/bus.c
@@ -24,8 +24,8 @@
#include <linux/io.h>
#include <linux/mm.h>
#include <linux/nd.h>
-#include "nd-private.h"
-#include "nd.h"
+#include <nd-private.h>
+#include <nd.h>
int nvdimm_major;
static int nvdimm_bus_major;
diff --git a/drivers/nvdimm/dimm.c b/drivers/nvdimm/dimm.c
index 2df97c3c3b34..03b7b1bd689d 100644
--- a/drivers/nvdimm/dimm.c
+++ b/drivers/nvdimm/dimm.c
@@ -18,8 +18,8 @@
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/nd.h>
-#include "label.h"
-#include "nd.h"
+#include <label.h>
+#include <nd.h>
static void free_data(struct nvdimm_drvdata *ndd)
{
diff --git a/drivers/nvdimm/label.c b/drivers/nvdimm/label.c
index 6f67db5a3302..ab09bddbe7b4 100644
--- a/drivers/nvdimm/label.c
+++ b/drivers/nvdimm/label.c
@@ -15,9 +15,9 @@
#include <linux/slab.h>
#include <linux/io.h>
#include <linux/nd.h>
-#include "nd-private.h"
-#include "label.h"
-#include "nd.h"
+#include <nd-private.h>
+#include <label.h>
+#include <nd.h>
#include <asm-generic/io-64-nonatomic-lo-hi.h>
diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c
index ab71b454a020..e89b0192ef10 100644
--- a/drivers/nvdimm/namespace_devs.c
+++ b/drivers/nvdimm/namespace_devs.c
@@ -14,8 +14,8 @@
#include <linux/device.h>
#include <linux/slab.h>
#include <linux/nd.h>
-#include "nd-private.h"
-#include "nd.h"
+#include <nd-private.h>
+#include <nd.h>
#include <asm-generic/io-64-nonatomic-lo-hi.h>
diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c
index 0a85a9ca3ca4..0b0f81350d5e 100644
--- a/drivers/nvdimm/pmem.c
+++ b/drivers/nvdimm/pmem.c
@@ -24,7 +24,7 @@
#include <linux/moduleparam.h>
#include <linux/slab.h>
#include <linux/nd.h>
-#include "nd.h"
+#include <nd.h>
struct pmem_device {
struct request_queue *pmem_queue;
diff --git a/drivers/nvdimm/region.c b/drivers/nvdimm/region.c
index d9d82e7a90fa..373eab4f77ca 100644
--- a/drivers/nvdimm/region.c
+++ b/drivers/nvdimm/region.c
@@ -14,7 +14,7 @@
#include <linux/module.h>
#include <linux/device.h>
#include <linux/nd.h>
-#include "nd.h"
+#include <nd.h>
struct nd_percpu_lane {
int count[CONFIG_ND_MAX_REGIONS];
diff --git a/drivers/nvdimm/region_devs.c b/drivers/nvdimm/region_devs.c
index 5790aec081f4..86adbd81afb4 100644
--- a/drivers/nvdimm/region_devs.c
+++ b/drivers/nvdimm/region_devs.c
@@ -17,8 +17,8 @@
#include <linux/sort.h>
#include <linux/io.h>
#include <linux/nd.h>
-#include "nd-private.h"
-#include "nd.h"
+#include <nd-private.h>
+#include <nd.h>
static DEFINE_IDA(region_ida);
diff --git a/tools/testing/nvdimm/Kbuild b/tools/testing/nvdimm/Kbuild
new file mode 100644
index 000000000000..1d93099f0ed6
--- /dev/null
+++ b/tools/testing/nvdimm/Kbuild
@@ -0,0 +1,37 @@
+ldflags-y += --wrap=ioremap_cache
+ldflags-y += --wrap=ioremap_nocache
+ldflags-y += --wrap=iounmap
+ldflags-y += --wrap=__request_region
+ldflags-y += --wrap=__release_region
+
+DRIVERS := ../../../drivers
+NVDIMM_SRC := $(DRIVERS)/nvdimm
+ACPI_SRC := $(DRIVERS)/acpi
+ccflags-y := -I$(src)/$(NVDIMM_SRC)
+ccflags-y += -I$(src)/$(ACPI_SRC)
+
+obj-m += libnvdimm.o
+obj-m += nd_pmem.o
+obj-m += nd_btt.o
+obj-m += nd_blk.o
+obj-m += nfit.o
+
+nfit-y := $(ACPI_SRC)/nfit.o
+
+nd_pmem-y := $(NVDIMM_SRC)/pmem.o
+
+nd_btt-y := $(NVDIMM_SRC)/btt.o
+
+nd_blk-y := $(NVDIMM_SRC)/blk.o
+
+libnvdimm-y := $(NVDIMM_SRC)/core.o
+libnvdimm-y += $(NVDIMM_SRC)/bus.o
+libnvdimm-y += $(NVDIMM_SRC)/dimm_devs.o
+libnvdimm-y += $(NVDIMM_SRC)/dimm.o
+libnvdimm-y += $(NVDIMM_SRC)/region_devs.o
+libnvdimm-y += $(NVDIMM_SRC)/region.o
+libnvdimm-y += $(NVDIMM_SRC)/namespace_devs.o
+libnvdimm-y += $(NVDIMM_SRC)/label.o
+libnvdimm-y += $(NVDIMM_SRC)/btt_devs.o
+
+obj-m += test/
diff --git a/tools/testing/nvdimm/Makefile b/tools/testing/nvdimm/Makefile
new file mode 100644
index 000000000000..3dfe024b4e7e
--- /dev/null
+++ b/tools/testing/nvdimm/Makefile
@@ -0,0 +1,7 @@
+KDIR ?= ../../../
+
+default:
+ $(MAKE) -C $(KDIR) M=$$PWD
+
+install: default
+ $(MAKE) -C $(KDIR) M=$$PWD modules_install
diff --git a/tools/testing/nvdimm/test/Kbuild b/tools/testing/nvdimm/test/Kbuild
new file mode 100644
index 000000000000..9241064970fe
--- /dev/null
+++ b/tools/testing/nvdimm/test/Kbuild
@@ -0,0 +1,8 @@
+ccflags-y := -I$(src)/../../../../drivers/nvdimm/
+ccflags-y += -I$(src)/../../../../drivers/acpi/
+
+obj-m += nfit_test.o
+obj-m += nfit_test_iomap.o
+
+nfit_test-y := nfit.o
+nfit_test_iomap-y := iomap.o
diff --git a/tools/testing/nvdimm/test/iomap.c b/tools/testing/nvdimm/test/iomap.c
new file mode 100644
index 000000000000..c85a6f6ba559
--- /dev/null
+++ b/tools/testing/nvdimm/test/iomap.c
@@ -0,0 +1,151 @@
+/*
+ * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ */
+#include <linux/rculist.h>
+#include <linux/export.h>
+#include <linux/ioport.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/io.h>
+#include "nfit_test.h"
+
+static LIST_HEAD(iomap_head);
+
+static struct iomap_ops {
+ nfit_test_lookup_fn nfit_test_lookup;
+ struct list_head list;
+} iomap_ops = {
+ .list = LIST_HEAD_INIT(iomap_ops.list),
+};
+
+void nfit_test_setup(nfit_test_lookup_fn lookup)
+{
+ iomap_ops.nfit_test_lookup = lookup;
+ list_add_rcu(&iomap_ops.list, &iomap_head);
+}
+EXPORT_SYMBOL(nfit_test_setup);
+
+void nfit_test_teardown(void)
+{
+ list_del_rcu(&iomap_ops.list);
+ synchronize_rcu();
+}
+EXPORT_SYMBOL(nfit_test_teardown);
+
+static struct nfit_test_resource *get_nfit_res(resource_size_t resource)
+{
+ struct iomap_ops *ops;
+
+ ops = list_first_or_null_rcu(&iomap_head, typeof(*ops), list);
+ if (ops)
+ return ops->nfit_test_lookup(resource);
+ return NULL;
+}
+
+void __iomem *__nfit_test_ioremap(resource_size_t offset, unsigned long size,
+ void __iomem *(*fallback_fn)(resource_size_t, unsigned long))
+{
+ struct nfit_test_resource *nfit_res;
+
+ rcu_read_lock();
+ nfit_res = get_nfit_res(offset);
+ rcu_read_unlock();
+ if (nfit_res)
+ return (void __iomem *) nfit_res->buf + offset
+ - nfit_res->res->start;
+ return fallback_fn(offset, size);
+}
+
+void __iomem *__wrap_ioremap_cache(resource_size_t offset, unsigned long size)
+{
+ return __nfit_test_ioremap(offset, size, ioremap_cache);
+}
+EXPORT_SYMBOL(__wrap_ioremap_cache);
+
+void __iomem *__wrap_ioremap_nocache(resource_size_t offset, unsigned long size)
+{
+ return __nfit_test_ioremap(offset, size, ioremap_nocache);
+}
+EXPORT_SYMBOL(__wrap_ioremap_nocache);
+
+void __wrap_iounmap(volatile void __iomem *addr)
+{
+ struct nfit_test_resource *nfit_res;
+
+ rcu_read_lock();
+ nfit_res = get_nfit_res((unsigned long) addr);
+ rcu_read_unlock();
+ if (nfit_res)
+ return;
+ return iounmap(addr);
+}
+EXPORT_SYMBOL(__wrap_iounmap);
+
+struct resource *__wrap___request_region(struct resource *parent,
+ resource_size_t start, resource_size_t n, const char *name,
+ int flags)
+{
+ struct nfit_test_resource *nfit_res;
+
+ if (parent == &iomem_resource) {
+ rcu_read_lock();
+ nfit_res = get_nfit_res(start);
+ rcu_read_unlock();
+ if (nfit_res) {
+ struct resource *res = nfit_res->res + 1;
+
+ if (start + n > nfit_res->res->start
+ + resource_size(nfit_res->res)) {
+ pr_debug("%s: start: %llx n: %llx overflow: %pr\n",
+ __func__, start, n,
+ nfit_res->res);
+ return NULL;
+ }
+
+ res->start = start;
+ res->end = start + n - 1;
+ res->name = name;
+ res->flags = resource_type(parent);
+ res->flags |= IORESOURCE_BUSY | flags;
+ pr_debug("%s: %pr\n", __func__, res);
+ return res;
+ }
+ }
+ return __request_region(parent, start, n, name, flags);
+}
+EXPORT_SYMBOL(__wrap___request_region);
+
+void __wrap___release_region(struct resource *parent, resource_size_t start,
+ resource_size_t n)
+{
+ struct nfit_test_resource *nfit_res;
+
+ if (parent == &iomem_resource) {
+ rcu_read_lock();
+ nfit_res = get_nfit_res(start);
+ rcu_read_unlock();
+ if (nfit_res) {
+ struct resource *res = nfit_res->res + 1;
+
+ if (start != res->start || resource_size(res) != n)
+ pr_info("%s: start: %llx n: %llx mismatch: %pr\n",
+ __func__, start, n, res);
+ else
+ memset(res, 0, sizeof(*res));
+ return;
+ }
+ }
+ __release_region(parent, start, n);
+}
+EXPORT_SYMBOL(__wrap___release_region);
+
+MODULE_LICENSE("GPL v2");
diff --git a/tools/testing/nvdimm/test/nfit.c b/tools/testing/nvdimm/test/nfit.c
new file mode 100644
index 000000000000..a4078252138e
--- /dev/null
+++ b/tools/testing/nvdimm/test/nfit.c
@@ -0,0 +1,1101 @@
+/*
+ * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/platform_device.h>
+#include <linux/dma-mapping.h>
+#include <linux/libnvdimm.h>
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/ndctl.h>
+#include <linux/sizes.h>
+#include <linux/slab.h>
+#include <nfit.h>
+#include <nd.h>
+#include "nfit_test.h"
+
+/*
+ * Generate an NFIT table to describe the following topology:
+ *
+ * BUS0: Interleaved PMEM regions, and aliasing with BLK regions
+ *
+ * (a) (b) DIMM BLK-REGION
+ * +----------+--------------+----------+---------+
+ * +------+ | blk2.0 | pm0.0 | blk2.1 | pm1.0 | 0 region2
+ * | imc0 +--+- - - - - region0 - - - -+----------+ +
+ * +--+---+ | blk3.0 | pm0.0 | blk3.1 | pm1.0 | 1 region3
+ * | +----------+--------------v----------v v
+ * +--+---+ | |
+ * | cpu0 | region1
+ * +--+---+ | |
+ * | +-------------------------^----------^ ^
+ * +--+---+ | blk4.0 | pm1.0 | 2 region4
+ * | imc1 +--+-------------------------+----------+ +
+ * +------+ | blk5.0 | pm1.0 | 3 region5
+ * +-------------------------+----------+-+-------+
+ *
+ * *) In this layout we have four dimms and two memory controllers in one
+ * socket. Each unique interface (BLK or PMEM) to DPA space
+ * is identified by a region device with a dynamically assigned id.
+ *
+ * *) The first portion of dimm0 and dimm1 are interleaved as REGION0.
+ * A single PMEM namespace "pm0.0" is created using half of the
+ * REGION0 SPA-range. REGION0 spans dimm0 and dimm1. PMEM namespace
+ * allocate from from the bottom of a region. The unallocated
+ * portion of REGION0 aliases with REGION2 and REGION3. That
+ * unallacted capacity is reclaimed as BLK namespaces ("blk2.0" and
+ * "blk3.0") starting at the base of each DIMM to offset (a) in those
+ * DIMMs. "pm0.0", "blk2.0" and "blk3.0" are free-form readable
+ * names that can be assigned to a namespace.
+ *
+ * *) In the last portion of dimm0 and dimm1 we have an interleaved
+ * SPA range, REGION1, that spans those two dimms as well as dimm2
+ * and dimm3. Some of REGION1 allocated to a PMEM namespace named
+ * "pm1.0" the rest is reclaimed in 4 BLK namespaces (for each
+ * dimm in the interleave set), "blk2.1", "blk3.1", "blk4.0", and
+ * "blk5.0".
+ *
+ * *) The portion of dimm2 and dimm3 that do not participate in the
+ * REGION1 interleaved SPA range (i.e. the DPA address below offset
+ * (b) are also included in the "blk4.0" and "blk5.0" namespaces.
+ * Note, that BLK namespaces need not be contiguous in DPA-space, and
+ * can consume aliased capacity from multiple interleave sets.
+ *
+ * BUS1: Legacy NVDIMM (single contiguous range)
+ *
+ * region2
+ * +---------------------+
+ * |---------------------|
+ * || pm2.0 ||
+ * |---------------------|
+ * +---------------------+
+ *
+ * *) A NFIT-table may describe a simple system-physical-address range
+ * with no BLK aliasing. This type of region may optionally
+ * reference an NVDIMM.
+ */
+enum {
+ NUM_PM = 2,
+ NUM_DCR = 4,
+ NUM_BDW = NUM_DCR,
+ NUM_SPA = NUM_PM + NUM_DCR + NUM_BDW,
+ NUM_MEM = NUM_DCR + NUM_BDW + 2 /* spa0 iset */ + 4 /* spa1 iset */,
+ DIMM_SIZE = SZ_32M,
+ LABEL_SIZE = SZ_128K,
+ SPA0_SIZE = DIMM_SIZE,
+ SPA1_SIZE = DIMM_SIZE*2,
+ SPA2_SIZE = DIMM_SIZE,
+ BDW_SIZE = 64 << 8,
+ DCR_SIZE = 12,
+ NUM_NFITS = 2, /* permit testing multiple NFITs per system */
+};
+
+struct nfit_test_dcr {
+ __le64 bdw_addr;
+ __le32 bdw_status;
+ __u8 aperature[BDW_SIZE];
+};
+
+static u32 handle[NUM_DCR] = {
+ [0] = NFIT_DIMM_HANDLE(0, 0, 0, 0, 0),
+ [1] = NFIT_DIMM_HANDLE(0, 0, 0, 0, 1),
+ [2] = NFIT_DIMM_HANDLE(0, 0, 1, 0, 0),
+ [3] = NFIT_DIMM_HANDLE(0, 0, 1, 0, 1),
+};
+
+struct nfit_test {
+ struct acpi_nfit_desc acpi_desc;
+ struct platform_device pdev;
+ struct list_head resources;
+ void *nfit_buf;
+ dma_addr_t nfit_dma;
+ size_t nfit_size;
+ int num_dcr;
+ int num_pm;
+ void **dimm;
+ dma_addr_t *dimm_dma;
+ void **label;
+ dma_addr_t *label_dma;
+ void **spa_set;
+ dma_addr_t *spa_set_dma;
+ struct nfit_test_dcr **dcr;
+ dma_addr_t *dcr_dma;
+ int (*alloc)(struct nfit_test *t);
+ void (*setup)(struct nfit_test *t);
+};
+
+static struct nfit_test *to_nfit_test(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+
+ return container_of(pdev, struct nfit_test, pdev);
+}
+
+static int nfit_test_ctl(struct nvdimm_bus_descriptor *nd_desc,
+ struct nvdimm *nvdimm, unsigned int cmd, void *buf,
+ unsigned int buf_len)
+{
+ struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc);
+ struct nfit_test *t = container_of(acpi_desc, typeof(*t), acpi_desc);
+ struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
+ int i, rc;
+
+ if (!nfit_mem || !test_bit(cmd, &nfit_mem->dsm_mask))
+ return -ENXIO;
+
+ /* lookup label space for the given dimm */
+ for (i = 0; i < ARRAY_SIZE(handle); i++)
+ if (__to_nfit_memdev(nfit_mem)->device_handle == handle[i])
+ break;
+ if (i >= ARRAY_SIZE(handle))
+ return -ENXIO;
+
+ switch (cmd) {
+ case ND_CMD_GET_CONFIG_SIZE: {
+ struct nd_cmd_get_config_size *nd_cmd = buf;
+
+ if (buf_len < sizeof(*nd_cmd))
+ return -EINVAL;
+ nd_cmd->status = 0;
+ nd_cmd->config_size = LABEL_SIZE;
+ nd_cmd->max_xfer = SZ_4K;
+ rc = 0;
+ break;
+ }
+ case ND_CMD_GET_CONFIG_DATA: {
+ struct nd_cmd_get_config_data_hdr *nd_cmd = buf;
+ unsigned int len, offset = nd_cmd->in_offset;
+
+ if (buf_len < sizeof(*nd_cmd))
+ return -EINVAL;
+ if (offset >= LABEL_SIZE)
+ return -EINVAL;
+ if (nd_cmd->in_length + sizeof(*nd_cmd) > buf_len)
+ return -EINVAL;
+
+ nd_cmd->status = 0;
+ len = min(nd_cmd->in_length, LABEL_SIZE - offset);
+ memcpy(nd_cmd->out_buf, t->label[i] + offset, len);
+ rc = buf_len - sizeof(*nd_cmd) - len;
+ break;
+ }
+ case ND_CMD_SET_CONFIG_DATA: {
+ struct nd_cmd_set_config_hdr *nd_cmd = buf;
+ unsigned int len, offset = nd_cmd->in_offset;
+ u32 *status;
+
+ if (buf_len < sizeof(*nd_cmd))
+ return -EINVAL;
+ if (offset >= LABEL_SIZE)
+ return -EINVAL;
+ if (nd_cmd->in_length + sizeof(*nd_cmd) + 4 > buf_len)
+ return -EINVAL;
+
+ status = buf + nd_cmd->in_length + sizeof(*nd_cmd);
+ *status = 0;
+ len = min(nd_cmd->in_length, LABEL_SIZE - offset);
+ memcpy(t->label[i] + offset, nd_cmd->in_buf, len);
+ rc = buf_len - sizeof(*nd_cmd) - (len + 4);
+ break;
+ }
+ default:
+ return -ENOTTY;
+ }
+
+ return rc;
+}
+
+static DEFINE_SPINLOCK(nfit_test_lock);
+static struct nfit_test *instances[NUM_NFITS];
+
+static void release_nfit_res(void *data)
+{
+ struct nfit_test_resource *nfit_res = data;
+ struct resource *res = nfit_res->res;
+
+ spin_lock(&nfit_test_lock);
+ list_del(&nfit_res->list);
+ spin_unlock(&nfit_test_lock);
+
+ if (is_vmalloc_addr(nfit_res->buf))
+ vfree(nfit_res->buf);
+ else
+ dma_free_coherent(nfit_res->dev, resource_size(res),
+ nfit_res->buf, res->start);
+ kfree(res);
+ kfree(nfit_res);
+}
+
+static void *__test_alloc(struct nfit_test *t, size_t size, dma_addr_t *dma,
+ void *buf)
+{
+ struct device *dev = &t->pdev.dev;
+ struct resource *res = kzalloc(sizeof(*res) * 2, GFP_KERNEL);
+ struct nfit_test_resource *nfit_res = kzalloc(sizeof(*nfit_res),
+ GFP_KERNEL);
+ int rc;
+
+ if (!res || !buf || !nfit_res)
+ goto err;
+ rc = devm_add_action(dev, release_nfit_res, nfit_res);
+ if (rc)
+ goto err;
+ INIT_LIST_HEAD(&nfit_res->list);
+ memset(buf, 0, size);
+ nfit_res->dev = dev;
+ nfit_res->buf = buf;
+ nfit_res->res = res;
+ res->start = *dma;
+ res->end = *dma + size - 1;
+ res->name = "NFIT";
+ spin_lock(&nfit_test_lock);
+ list_add(&nfit_res->list, &t->resources);
+ spin_unlock(&nfit_test_lock);
+
+ return nfit_res->buf;
+ err:
+ if (buf && !is_vmalloc_addr(buf))
+ dma_free_coherent(dev, size, buf, *dma);
+ else if (buf)
+ vfree(buf);
+ kfree(res);
+ kfree(nfit_res);
+ return NULL;
+}
+
+static void *test_alloc(struct nfit_test *t, size_t size, dma_addr_t *dma)
+{
+ void *buf = vmalloc(size);
+
+ *dma = (unsigned long) buf;
+ return __test_alloc(t, size, dma, buf);
+}
+
+static void *test_alloc_coherent(struct nfit_test *t, size_t size, dma_addr_t *dma)
+{
+ struct device *dev = &t->pdev.dev;
+ void *buf = dma_alloc_coherent(dev, size, dma, GFP_KERNEL);
+
+ return __test_alloc(t, size, dma, buf);
+}
+
+static struct nfit_test_resource *nfit_test_lookup(resource_size_t addr)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(instances); i++) {
+ struct nfit_test_resource *n, *nfit_res = NULL;
+ struct nfit_test *t = instances[i];
+
+ if (!t)
+ continue;
+ spin_lock(&nfit_test_lock);
+ list_for_each_entry(n, &t->resources, list) {
+ if (addr >= n->res->start && (addr < n->res->start
+ + resource_size(n->res))) {
+ nfit_res = n;
+ break;
+ } else if (addr >= (unsigned long) n->buf
+ && (addr < (unsigned long) n->buf
+ + resource_size(n->res))) {
+ nfit_res = n;
+ break;
+ }
+ }
+ spin_unlock(&nfit_test_lock);
+ if (nfit_res)
+ return nfit_res;
+ }
+
+ return NULL;
+}
+
+static int nfit_test0_alloc(struct nfit_test *t)
+{
+ size_t nfit_size = sizeof(struct acpi_table_nfit)
+ + sizeof(struct acpi_nfit_system_address) * NUM_SPA
+ + sizeof(struct acpi_nfit_memory_map) * NUM_MEM
+ + sizeof(struct acpi_nfit_control_region) * NUM_DCR
+ + sizeof(struct acpi_nfit_data_region) * NUM_BDW;
+ int i;
+
+ t->nfit_buf = test_alloc(t, nfit_size, &t->nfit_dma);
+ if (!t->nfit_buf)
+ return -ENOMEM;
+ t->nfit_size = nfit_size;
+
+ t->spa_set[0] = test_alloc_coherent(t, SPA0_SIZE, &t->spa_set_dma[0]);
+ if (!t->spa_set[0])
+ return -ENOMEM;
+
+ t->spa_set[1] = test_alloc_coherent(t, SPA1_SIZE, &t->spa_set_dma[1]);
+ if (!t->spa_set[1])
+ return -ENOMEM;
+
+ for (i = 0; i < NUM_DCR; i++) {
+ t->dimm[i] = test_alloc(t, DIMM_SIZE, &t->dimm_dma[i]);
+ if (!t->dimm[i])
+ return -ENOMEM;
+
+ t->label[i] = test_alloc(t, LABEL_SIZE, &t->label_dma[i]);
+ if (!t->label[i])
+ return -ENOMEM;
+ sprintf(t->label[i], "label%d", i);
+ }
+
+ for (i = 0; i < NUM_DCR; i++) {
+ t->dcr[i] = test_alloc(t, LABEL_SIZE, &t->dcr_dma[i]);
+ if (!t->dcr[i])
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
+static int nfit_test1_alloc(struct nfit_test *t)
+{
+ size_t nfit_size = sizeof(struct acpi_table_nfit)
+ + sizeof(struct acpi_nfit_system_address) + sizeof(struct acpi_nfit_memory_map)
+ + sizeof(struct acpi_nfit_control_region);
+
+ t->nfit_buf = test_alloc(t, nfit_size, &t->nfit_dma);
+ if (!t->nfit_buf)
+ return -ENOMEM;
+ t->nfit_size = nfit_size;
+
+ t->spa_set[0] = test_alloc_coherent(t, SPA2_SIZE, &t->spa_set_dma[0]);
+ if (!t->spa_set[0])
+ return -ENOMEM;
+
+ return 0;
+}
+
+static void nfit_test_init_header(struct acpi_table_nfit *nfit, size_t size)
+{
+ memcpy(nfit->header.signature, ACPI_SIG_NFIT, 4);
+ nfit->header.length = size;
+ nfit->header.revision = 1;
+ memcpy(nfit->header.oem_id, "LIBND", 6);
+ memcpy(nfit->header.oem_table_id, "TEST", 5);
+ nfit->header.oem_revision = 1;
+ memcpy(nfit->header.asl_compiler_id, "TST", 4);
+ nfit->header.asl_compiler_revision = 1;
+}
+
+static void nfit_test0_setup(struct nfit_test *t)
+{
+ struct nvdimm_bus_descriptor *nd_desc;
+ struct acpi_nfit_desc *acpi_desc;
+ struct acpi_nfit_memory_map *memdev;
+ void *nfit_buf = t->nfit_buf;
+ size_t size = t->nfit_size;
+ struct acpi_nfit_system_address *spa;
+ struct acpi_nfit_control_region *dcr;
+ struct acpi_nfit_data_region *bdw;
+ unsigned int offset;
+
+ nfit_test_init_header(nfit_buf, size);
+
+ /*
+ * spa0 (interleave first half of dimm0 and dimm1, note storage
+ * does not actually alias the related block-data-window
+ * regions)
+ */
+ spa = nfit_buf + sizeof(struct acpi_table_nfit);
+ spa->header.type = ACPI_NFIT_TYPE_SYSTEM_ADDRESS;
+ spa->header.length = sizeof(*spa);
+ memcpy(spa->range_guid, to_nfit_uuid(NFIT_SPA_PM), 16);
+ spa->range_index = 0+1;
+ spa->address = t->spa_set_dma[0];
+ spa->length = SPA0_SIZE;
+
+ /*
+ * spa1 (interleave last half of the 4 DIMMS, note storage
+ * does not actually alias the related block-data-window
+ * regions)
+ */
+ spa = nfit_buf + sizeof(struct acpi_table_nfit) + sizeof(*spa);
+ spa->header.type = ACPI_NFIT_TYPE_SYSTEM_ADDRESS;
+ spa->header.length = sizeof(*spa);
+ memcpy(spa->range_guid, to_nfit_uuid(NFIT_SPA_PM), 16);
+ spa->range_index = 1+1;
+ spa->address = t->spa_set_dma[1];
+ spa->length = SPA1_SIZE;
+
+ /* spa2 (dcr0) dimm0 */
+ spa = nfit_buf + sizeof(struct acpi_table_nfit) + sizeof(*spa) * 2;
+ spa->header.type = ACPI_NFIT_TYPE_SYSTEM_ADDRESS;
+ spa->header.length = sizeof(*spa);
+ memcpy(spa->range_guid, to_nfit_uuid(NFIT_SPA_DCR), 16);
+ spa->range_index = 2+1;
+ spa->address = t->dcr_dma[0];
+ spa->length = DCR_SIZE;
+
+ /* spa3 (dcr1) dimm1 */
+ spa = nfit_buf + sizeof(struct acpi_table_nfit) + sizeof(*spa) * 3;
+ spa->header.type = ACPI_NFIT_TYPE_SYSTEM_ADDRESS;
+ spa->header.length = sizeof(*spa);
+ memcpy(spa->range_guid, to_nfit_uuid(NFIT_SPA_DCR), 16);
+ spa->range_index = 3+1;
+ spa->address = t->dcr_dma[1];
+ spa->length = DCR_SIZE;
+
+ /* spa4 (dcr2) dimm2 */
+ spa = nfit_buf + sizeof(struct acpi_table_nfit) + sizeof(*spa) * 4;
+ spa->header.type = ACPI_NFIT_TYPE_SYSTEM_ADDRESS;
+ spa->header.length = sizeof(*spa);
+ memcpy(spa->range_guid, to_nfit_uuid(NFIT_SPA_DCR), 16);
+ spa->range_index = 4+1;
+ spa->address = t->dcr_dma[2];
+ spa->length = DCR_SIZE;
+
+ /* spa5 (dcr3) dimm3 */
+ spa = nfit_buf + sizeof(struct acpi_table_nfit) + sizeof(*spa) * 5;
+ spa->header.type = ACPI_NFIT_TYPE_SYSTEM_ADDRESS;
+ spa->header.length = sizeof(*spa);
+ memcpy(spa->range_guid, to_nfit_uuid(NFIT_SPA_DCR), 16);
+ spa->range_index = 5+1;
+ spa->address = t->dcr_dma[3];
+ spa->length = DCR_SIZE;
+
+ /* spa6 (bdw for dcr0) dimm0 */
+ spa = nfit_buf + sizeof(struct acpi_table_nfit) + sizeof(*spa) * 6;
+ spa->header.type = ACPI_NFIT_TYPE_SYSTEM_ADDRESS;
+ spa->header.length = sizeof(*spa);
+ memcpy(spa->range_guid, to_nfit_uuid(NFIT_SPA_BDW), 16);
+ spa->range_index = 6+1;
+ spa->address = t->dimm_dma[0];
+ spa->length = DIMM_SIZE;
+
+ /* spa7 (bdw for dcr1) dimm1 */
+ spa = nfit_buf + sizeof(struct acpi_table_nfit) + sizeof(*spa) * 7;
+ spa->header.type = ACPI_NFIT_TYPE_SYSTEM_ADDRESS;
+ spa->header.length = sizeof(*spa);
+ memcpy(spa->range_guid, to_nfit_uuid(NFIT_SPA_BDW), 16);
+ spa->range_index = 7+1;
+ spa->address = t->dimm_dma[1];
+ spa->length = DIMM_SIZE;
+
+ /* spa8 (bdw for dcr2) dimm2 */
+ spa = nfit_buf + sizeof(struct acpi_table_nfit) + sizeof(*spa) * 8;
+ spa->header.type = ACPI_NFIT_TYPE_SYSTEM_ADDRESS;
+ spa->header.length = sizeof(*spa);
+ memcpy(spa->range_guid, to_nfit_uuid(NFIT_SPA_BDW), 16);
+ spa->range_index = 8+1;
+ spa->address = t->dimm_dma[2];
+ spa->length = DIMM_SIZE;
+
+ /* spa9 (bdw for dcr3) dimm3 */
+ spa = nfit_buf + sizeof(struct acpi_table_nfit) + sizeof(*spa) * 9;
+ spa->header.type = ACPI_NFIT_TYPE_SYSTEM_ADDRESS;
+ spa->header.length = sizeof(*spa);
+ memcpy(spa->range_guid, to_nfit_uuid(NFIT_SPA_BDW), 16);
+ spa->range_index = 9+1;
+ spa->address = t->dimm_dma[3];
+ spa->length = DIMM_SIZE;
+
+ offset = sizeof(struct acpi_table_nfit) + sizeof(*spa) * 10;
+ /* mem-region0 (spa0, dimm0) */
+ memdev = nfit_buf + offset;
+ memdev->header.type = ACPI_NFIT_TYPE_MEMORY_MAP;
+ memdev->header.length = sizeof(*memdev);
+ memdev->device_handle = handle[0];
+ memdev->physical_id = 0;
+ memdev->region_id = 0;
+ memdev->range_index = 0+1;
+ memdev->region_index = 0+1;
+ memdev->region_size = SPA0_SIZE/2;
+ memdev->region_offset = t->spa_set_dma[0];
+ memdev->address = 0;
+ memdev->interleave_index = 0;
+ memdev->interleave_ways = 2;
+
+ /* mem-region1 (spa0, dimm1) */
+ memdev = nfit_buf + offset + sizeof(struct acpi_nfit_memory_map);
+ memdev->header.type = ACPI_NFIT_TYPE_MEMORY_MAP;
+ memdev->header.length = sizeof(*memdev);
+ memdev->device_handle = handle[1];
+ memdev->physical_id = 1;
+ memdev->region_id = 0;
+ memdev->range_index = 0+1;
+ memdev->region_index = 1+1;
+ memdev->region_size = SPA0_SIZE/2;
+ memdev->region_offset = t->spa_set_dma[0] + SPA0_SIZE/2;
+ memdev->address = 0;
+ memdev->interleave_index = 0;
+ memdev->interleave_ways = 2;
+
+ /* mem-region2 (spa1, dimm0) */
+ memdev = nfit_buf + offset + sizeof(struct acpi_nfit_memory_map) * 2;
+ memdev->header.type = ACPI_NFIT_TYPE_MEMORY_MAP;
+ memdev->header.length = sizeof(*memdev);
+ memdev->device_handle = handle[0];
+ memdev->physical_id = 0;
+ memdev->region_id = 1;
+ memdev->range_index = 1+1;
+ memdev->region_index = 0+1;
+ memdev->region_size = SPA1_SIZE/4;
+ memdev->region_offset = t->spa_set_dma[1];
+ memdev->address = SPA0_SIZE/2;
+ memdev->interleave_index = 0;
+ memdev->interleave_ways = 4;
+
+ /* mem-region3 (spa1, dimm1) */
+ memdev = nfit_buf + offset + sizeof(struct acpi_nfit_memory_map) * 3;
+ memdev->header.type = ACPI_NFIT_TYPE_MEMORY_MAP;
+ memdev->header.length = sizeof(*memdev);
+ memdev->device_handle = handle[1];
+ memdev->physical_id = 1;
+ memdev->region_id = 1;
+ memdev->range_index = 1+1;
+ memdev->region_index = 1+1;
+ memdev->region_size = SPA1_SIZE/4;
+ memdev->region_offset = t->spa_set_dma[1] + SPA1_SIZE/4;
+ memdev->address = SPA0_SIZE/2;
+ memdev->interleave_index = 0;
+ memdev->interleave_ways = 4;
+
+ /* mem-region4 (spa1, dimm2) */
+ memdev = nfit_buf + offset + sizeof(struct acpi_nfit_memory_map) * 4;
+ memdev->header.type = ACPI_NFIT_TYPE_MEMORY_MAP;
+ memdev->header.length = sizeof(*memdev);
+ memdev->device_handle = handle[2];
+ memdev->physical_id = 2;
+ memdev->region_id = 0;
+ memdev->range_index = 1+1;
+ memdev->region_index = 2+1;
+ memdev->region_size = SPA1_SIZE/4;
+ memdev->region_offset = t->spa_set_dma[1] + 2*SPA1_SIZE/4;
+ memdev->address = SPA0_SIZE/2;
+ memdev->interleave_index = 0;
+ memdev->interleave_ways = 4;
+
+ /* mem-region5 (spa1, dimm3) */
+ memdev = nfit_buf + offset + sizeof(struct acpi_nfit_memory_map) * 5;
+ memdev->header.type = ACPI_NFIT_TYPE_MEMORY_MAP;
+ memdev->header.length = sizeof(*memdev);
+ memdev->device_handle = handle[3];
+ memdev->physical_id = 3;
+ memdev->region_id = 0;
+ memdev->range_index = 1+1;
+ memdev->region_index = 3+1;
+ memdev->region_size = SPA1_SIZE/4;
+ memdev->region_offset = t->spa_set_dma[1] + 3*SPA1_SIZE/4;
+ memdev->address = SPA0_SIZE/2;
+ memdev->interleave_index = 0;
+ memdev->interleave_ways = 4;
+
+ /* mem-region6 (spa/dcr0, dimm0) */
+ memdev = nfit_buf + offset + sizeof(struct acpi_nfit_memory_map) * 6;
+ memdev->header.type = ACPI_NFIT_TYPE_MEMORY_MAP;
+ memdev->header.length = sizeof(*memdev);
+ memdev->device_handle = handle[0];
+ memdev->physical_id = 0;
+ memdev->region_id = 0;
+ memdev->range_index = 2+1;
+ memdev->region_index = 0+1;
+ memdev->region_size = 0;
+ memdev->region_offset = 0;
+ memdev->address = 0;
+ memdev->interleave_index = 0;
+ memdev->interleave_ways = 1;
+
+ /* mem-region7 (spa/dcr1, dimm1) */
+ memdev = nfit_buf + offset + sizeof(struct acpi_nfit_memory_map) * 7;
+ memdev->header.type = ACPI_NFIT_TYPE_MEMORY_MAP;
+ memdev->header.length = sizeof(*memdev);
+ memdev->device_handle = handle[1];
+ memdev->physical_id = 1;
+ memdev->region_id = 0;
+ memdev->range_index = 3+1;
+ memdev->region_index = 1+1;
+ memdev->region_size = 0;
+ memdev->region_offset = 0;
+ memdev->address = 0;
+ memdev->interleave_index = 0;
+ memdev->interleave_ways = 1;
+
+ /* mem-region8 (spa/dcr2, dimm2) */
+ memdev = nfit_buf + offset + sizeof(struct acpi_nfit_memory_map) * 8;
+ memdev->header.type = ACPI_NFIT_TYPE_MEMORY_MAP;
+ memdev->header.length = sizeof(*memdev);
+ memdev->device_handle = handle[2];
+ memdev->physical_id = 2;
+ memdev->region_id = 0;
+ memdev->range_index = 4+1;
+ memdev->region_index = 2+1;
+ memdev->region_size = 0;
+ memdev->region_offset = 0;
+ memdev->address = 0;
+ memdev->interleave_index = 0;
+ memdev->interleave_ways = 1;
+
+ /* mem-region9 (spa/dcr3, dimm3) */
+ memdev = nfit_buf + offset + sizeof(struct acpi_nfit_memory_map) * 9;
+ memdev->header.type = ACPI_NFIT_TYPE_MEMORY_MAP;
+ memdev->header.length = sizeof(*memdev);
+ memdev->device_handle = handle[3];
+ memdev->physical_id = 3;
+ memdev->region_id = 0;
+ memdev->range_index = 5+1;
+ memdev->region_index = 3+1;
+ memdev->region_size = 0;
+ memdev->region_offset = 0;
+ memdev->address = 0;
+ memdev->interleave_index = 0;
+ memdev->interleave_ways = 1;
+
+ /* mem-region10 (spa/bdw0, dimm0) */
+ memdev = nfit_buf + offset + sizeof(struct acpi_nfit_memory_map) * 10;
+ memdev->header.type = ACPI_NFIT_TYPE_MEMORY_MAP;
+ memdev->header.length = sizeof(*memdev);
+ memdev->device_handle = handle[0];
+ memdev->physical_id = 0;
+ memdev->region_id = 0;
+ memdev->range_index = 6+1;
+ memdev->region_index = 0+1;
+ memdev->region_size = 0;
+ memdev->region_offset = 0;
+ memdev->address = 0;
+ memdev->interleave_index = 0;
+ memdev->interleave_ways = 1;
+
+ /* mem-region11 (spa/bdw1, dimm1) */
+ memdev = nfit_buf + offset + sizeof(struct acpi_nfit_memory_map) * 11;
+ memdev->header.type = ACPI_NFIT_TYPE_MEMORY_MAP;
+ memdev->header.length = sizeof(*memdev);
+ memdev->device_handle = handle[1];
+ memdev->physical_id = 1;
+ memdev->region_id = 0;
+ memdev->range_index = 7+1;
+ memdev->region_index = 1+1;
+ memdev->region_size = 0;
+ memdev->region_offset = 0;
+ memdev->address = 0;
+ memdev->interleave_index = 0;
+ memdev->interleave_ways = 1;
+
+ /* mem-region12 (spa/bdw2, dimm2) */
+ memdev = nfit_buf + offset + sizeof(struct acpi_nfit_memory_map) * 12;
+ memdev->header.type = ACPI_NFIT_TYPE_MEMORY_MAP;
+ memdev->header.length = sizeof(*memdev);
+ memdev->device_handle = handle[2];
+ memdev->physical_id = 2;
+ memdev->region_id = 0;
+ memdev->range_index = 8+1;
+ memdev->region_index = 2+1;
+ memdev->region_size = 0;
+ memdev->region_offset = 0;
+ memdev->address = 0;
+ memdev->interleave_index = 0;
+ memdev->interleave_ways = 1;
+
+ /* mem-region13 (spa/dcr3, dimm3) */
+ memdev = nfit_buf + offset + sizeof(struct acpi_nfit_memory_map) * 13;
+ memdev->header.type = ACPI_NFIT_TYPE_MEMORY_MAP;
+ memdev->header.length = sizeof(*memdev);
+ memdev->device_handle = handle[3];
+ memdev->physical_id = 3;
+ memdev->region_id = 0;
+ memdev->range_index = 9+1;
+ memdev->region_index = 3+1;
+ memdev->region_size = 0;
+ memdev->region_offset = 0;
+ memdev->address = 0;
+ memdev->interleave_index = 0;
+ memdev->interleave_ways = 1;
+
+ offset = offset + sizeof(struct acpi_nfit_memory_map) * 14;
+ /* dcr-descriptor0 */
+ dcr = nfit_buf + offset;
+ dcr->header.type = ACPI_NFIT_TYPE_CONTROL_REGION;
+ dcr->header.length = sizeof(struct acpi_nfit_control_region);
+ dcr->region_index = 0+1;
+ dcr->vendor_id = 0xabcd;
+ dcr->device_id = 0;
+ dcr->revision_id = 1;
+ dcr->serial_number = ~handle[0];
+ dcr->windows = 1;
+ dcr->window_size = DCR_SIZE;
+ dcr->command_offset = 0;
+ dcr->command_size = 8;
+ dcr->status_offset = 8;
+ dcr->status_size = 4;
+
+ /* dcr-descriptor1 */
+ dcr = nfit_buf + offset + sizeof(struct acpi_nfit_control_region);
+ dcr->header.type = ACPI_NFIT_TYPE_CONTROL_REGION;
+ dcr->header.length = sizeof(struct acpi_nfit_control_region);
+ dcr->region_index = 1+1;
+ dcr->vendor_id = 0xabcd;
+ dcr->device_id = 0;
+ dcr->revision_id = 1;
+ dcr->serial_number = ~handle[1];
+ dcr->windows = 1;
+ dcr->window_size = DCR_SIZE;
+ dcr->command_offset = 0;
+ dcr->command_size = 8;
+ dcr->status_offset = 8;
+ dcr->status_size = 4;
+
+ /* dcr-descriptor2 */
+ dcr = nfit_buf + offset + sizeof(struct acpi_nfit_control_region) * 2;
+ dcr->header.type = ACPI_NFIT_TYPE_CONTROL_REGION;
+ dcr->header.length = sizeof(struct acpi_nfit_control_region);
+ dcr->region_index = 2+1;
+ dcr->vendor_id = 0xabcd;
+ dcr->device_id = 0;
+ dcr->revision_id = 1;
+ dcr->serial_number = ~handle[2];
+ dcr->windows = 1;
+ dcr->window_size = DCR_SIZE;
+ dcr->command_offset = 0;
+ dcr->command_size = 8;
+ dcr->status_offset = 8;
+ dcr->status_size = 4;
+
+ /* dcr-descriptor3 */
+ dcr = nfit_buf + offset + sizeof(struct acpi_nfit_control_region) * 3;
+ dcr->header.type = ACPI_NFIT_TYPE_CONTROL_REGION;
+ dcr->header.length = sizeof(struct acpi_nfit_control_region);
+ dcr->region_index = 3+1;
+ dcr->vendor_id = 0xabcd;
+ dcr->device_id = 0;
+ dcr->revision_id = 1;
+ dcr->serial_number = ~handle[3];
+ dcr->windows = 1;
+ dcr->window_size = DCR_SIZE;
+ dcr->command_offset = 0;
+ dcr->command_size = 8;
+ dcr->status_offset = 8;
+ dcr->status_size = 4;
+
+ offset = offset + sizeof(struct acpi_nfit_control_region) * 4;
+ /* bdw0 (spa/dcr0, dimm0) */
+ bdw = nfit_buf + offset;
+ bdw->header.type = ACPI_NFIT_TYPE_DATA_REGION;
+ bdw->header.length = sizeof(struct acpi_nfit_data_region);
+ bdw->region_index = 0+1;
+ bdw->windows = 1;
+ bdw->offset = 0;
+ bdw->size = BDW_SIZE;
+ bdw->capacity = DIMM_SIZE;
+ bdw->start_address = 0;
+
+ /* bdw1 (spa/dcr1, dimm1) */
+ bdw = nfit_buf + offset + sizeof(struct acpi_nfit_data_region);
+ bdw->header.type = ACPI_NFIT_TYPE_DATA_REGION;
+ bdw->header.length = sizeof(struct acpi_nfit_data_region);
+ bdw->region_index = 1+1;
+ bdw->windows = 1;
+ bdw->offset = 0;
+ bdw->size = BDW_SIZE;
+ bdw->capacity = DIMM_SIZE;
+ bdw->start_address = 0;
+
+ /* bdw2 (spa/dcr2, dimm2) */
+ bdw = nfit_buf + offset + sizeof(struct acpi_nfit_data_region) * 2;
+ bdw->header.type = ACPI_NFIT_TYPE_DATA_REGION;
+ bdw->header.length = sizeof(struct acpi_nfit_data_region);
+ bdw->region_index = 2+1;
+ bdw->windows = 1;
+ bdw->offset = 0;
+ bdw->size = BDW_SIZE;
+ bdw->capacity = DIMM_SIZE;
+ bdw->start_address = 0;
+
+ /* bdw3 (spa/dcr3, dimm3) */
+ bdw = nfit_buf + offset + sizeof(struct acpi_nfit_data_region) * 3;
+ bdw->header.type = ACPI_NFIT_TYPE_DATA_REGION;
+ bdw->header.length = sizeof(struct acpi_nfit_data_region);
+ bdw->region_index = 3+1;
+ bdw->windows = 1;
+ bdw->offset = 0;
+ bdw->size = BDW_SIZE;
+ bdw->capacity = DIMM_SIZE;
+ bdw->start_address = 0;
+
+ acpi_desc = &t->acpi_desc;
+ set_bit(ND_CMD_GET_CONFIG_SIZE, &acpi_desc->dimm_dsm_force_en);
+ set_bit(ND_CMD_GET_CONFIG_DATA, &acpi_desc->dimm_dsm_force_en);
+ set_bit(ND_CMD_SET_CONFIG_DATA, &acpi_desc->dimm_dsm_force_en);
+ nd_desc = &acpi_desc->nd_desc;
+ nd_desc->ndctl = nfit_test_ctl;
+}
+
+static void nfit_test1_setup(struct nfit_test *t)
+{
+ size_t size = t->nfit_size, offset;
+ void *nfit_buf = t->nfit_buf;
+ struct acpi_nfit_memory_map *memdev;
+ struct acpi_nfit_control_region *dcr;
+ struct acpi_nfit_system_address *spa;
+
+ nfit_test_init_header(nfit_buf, size);
+
+ offset = sizeof(struct acpi_table_nfit);
+ /* spa0 (flat range with no bdw aliasing) */
+ spa = nfit_buf + offset;
+ spa->header.type = ACPI_NFIT_TYPE_SYSTEM_ADDRESS;
+ spa->header.length = sizeof(*spa);
+ memcpy(spa->range_guid, to_nfit_uuid(NFIT_SPA_PM), 16);
+ spa->range_index = 0+1;
+ spa->address = t->spa_set_dma[0];
+ spa->length = SPA2_SIZE;
+
+ offset += sizeof(*spa);
+ /* mem-region0 (spa0, dimm0) */
+ memdev = nfit_buf + offset;
+ memdev->header.type = ACPI_NFIT_TYPE_MEMORY_MAP;
+ memdev->header.length = sizeof(*memdev);
+ memdev->device_handle = 0;
+ memdev->physical_id = 0;
+ memdev->region_id = 0;
+ memdev->range_index = 0+1;
+ memdev->region_index = 0+1;
+ memdev->region_size = SPA2_SIZE;
+ memdev->region_offset = 0;
+ memdev->address = 0;
+ memdev->interleave_index = 0;
+ memdev->interleave_ways = 1;
+
+ offset += sizeof(*memdev);
+ /* dcr-descriptor0 */
+ dcr = nfit_buf + offset;
+ dcr->header.type = ACPI_NFIT_TYPE_CONTROL_REGION;
+ dcr->header.length = sizeof(struct acpi_nfit_control_region);
+ dcr->region_index = 0+1;
+ dcr->vendor_id = 0xabcd;
+ dcr->device_id = 0;
+ dcr->revision_id = 1;
+ dcr->serial_number = ~0;
+ dcr->code = 0x201;
+ dcr->windows = 0;
+ dcr->window_size = 0;
+ dcr->command_offset = 0;
+ dcr->command_size = 0;
+ dcr->status_offset = 0;
+ dcr->status_size = 0;
+}
+
+static int nfit_test_blk_do_io(struct nd_blk_region *ndbr, void *iobuf,
+ u64 len, int rw, resource_size_t dpa)
+{
+ struct nfit_blk *nfit_blk = ndbr->blk_provider_data;
+ struct nfit_blk_mmio *mmio = &nfit_blk->mmio[BDW];
+ struct nd_region *nd_region = &ndbr->nd_region;
+ unsigned int bw;
+
+ bw = nd_region_acquire_lane(nd_region);
+ if (rw)
+ memcpy(mmio->base + dpa, iobuf, len);
+ else
+ memcpy(iobuf, mmio->base + dpa, len);
+ nd_region_release_lane(nd_region, bw);
+
+ return 0;
+}
+
+extern const struct attribute_group *acpi_nfit_attribute_groups[];
+
+static int nfit_test_probe(struct platform_device *pdev)
+{
+ struct nvdimm_bus_descriptor *nd_desc;
+ struct acpi_nfit_desc *acpi_desc;
+ struct device *dev = &pdev->dev;
+ struct nfit_test *nfit_test;
+ int rc;
+
+ nfit_test = to_nfit_test(&pdev->dev);
+
+ /* common alloc */
+ if (nfit_test->num_dcr) {
+ int num = nfit_test->num_dcr;
+
+ nfit_test->dimm = devm_kcalloc(dev, num, sizeof(void *), GFP_KERNEL);
+ nfit_test->dimm_dma = devm_kcalloc(dev, num, sizeof(dma_addr_t), GFP_KERNEL);
+ nfit_test->label = devm_kcalloc(dev, num, sizeof(void *), GFP_KERNEL);
+ nfit_test->label_dma = devm_kcalloc(dev, num, sizeof(dma_addr_t), GFP_KERNEL);
+ nfit_test->dcr = devm_kcalloc(dev, num, sizeof(struct nfit_test_dcr *), GFP_KERNEL);
+ nfit_test->dcr_dma = devm_kcalloc(dev, num, sizeof(dma_addr_t), GFP_KERNEL);
+ if (nfit_test->dimm && nfit_test->dimm_dma && nfit_test->label
+ && nfit_test->label_dma && nfit_test->dcr
+ && nfit_test->dcr_dma)
+ /* pass */;
+ else
+ return -ENOMEM;
+ }
+
+ if (nfit_test->num_pm) {
+ int num = nfit_test->num_pm;
+
+ nfit_test->spa_set = devm_kcalloc(dev, num, sizeof(void *), GFP_KERNEL);
+ nfit_test->spa_set_dma = devm_kcalloc(dev, num,
+ sizeof(dma_addr_t), GFP_KERNEL);
+ if (nfit_test->spa_set && nfit_test->spa_set_dma)
+ /* pass */;
+ else
+ return -ENOMEM;
+ }
+
+ /* per-nfit specific alloc */
+ if (nfit_test->alloc(nfit_test))
+ return -ENOMEM;
+
+ nfit_test->setup(nfit_test);
+ acpi_desc = &nfit_test->acpi_desc;
+ acpi_desc->dev = &pdev->dev;
+ acpi_desc->nfit = nfit_test->nfit_buf;
+ acpi_desc->blk_do_io = nfit_test_blk_do_io;
+ nd_desc = &acpi_desc->nd_desc;
+ nd_desc->attr_groups = acpi_nfit_attribute_groups;
+ acpi_desc->nvdimm_bus = nvdimm_bus_register(&pdev->dev, nd_desc);
+ if (!acpi_desc->nvdimm_bus)
+ return -ENXIO;
+
+ rc = acpi_nfit_init(acpi_desc, nfit_test->nfit_size);
+ if (rc) {
+ nvdimm_bus_unregister(acpi_desc->nvdimm_bus);
+ return rc;
+ }
+
+ return 0;
+}
+
+static int nfit_test_remove(struct platform_device *pdev)
+{
+ struct nfit_test *nfit_test = to_nfit_test(&pdev->dev);
+ struct acpi_nfit_desc *acpi_desc = &nfit_test->acpi_desc;
+
+ nvdimm_bus_unregister(acpi_desc->nvdimm_bus);
+
+ return 0;
+}
+
+static void nfit_test_release(struct device *dev)
+{
+ struct nfit_test *nfit_test = to_nfit_test(dev);
+
+ kfree(nfit_test);
+}
+
+static const struct platform_device_id nfit_test_id[] = {
+ { KBUILD_MODNAME },
+ { },
+};
+
+static struct platform_driver nfit_test_driver = {
+ .probe = nfit_test_probe,
+ .remove = nfit_test_remove,
+ .driver = {
+ .name = KBUILD_MODNAME,
+ },
+ .id_table = nfit_test_id,
+};
+
+#ifdef CONFIG_CMA_SIZE_MBYTES
+#define CMA_SIZE_MBYTES CONFIG_CMA_SIZE_MBYTES
+#else
+#define CMA_SIZE_MBYTES 0
+#endif
+
+static __init int nfit_test_init(void)
+{
+ int rc, i;
+
+ nfit_test_setup(nfit_test_lookup);
+
+ for (i = 0; i < NUM_NFITS; i++) {
+ struct nfit_test *nfit_test;
+ struct platform_device *pdev;
+ static int once;
+
+ nfit_test = kzalloc(sizeof(*nfit_test), GFP_KERNEL);
+ if (!nfit_test) {
+ rc = -ENOMEM;
+ goto err_register;
+ }
+ INIT_LIST_HEAD(&nfit_test->resources);
+ switch (i) {
+ case 0:
+ nfit_test->num_pm = NUM_PM;
+ nfit_test->num_dcr = NUM_DCR;
+ nfit_test->alloc = nfit_test0_alloc;
+ nfit_test->setup = nfit_test0_setup;
+ break;
+ case 1:
+ nfit_test->num_pm = 1;
+ nfit_test->alloc = nfit_test1_alloc;
+ nfit_test->setup = nfit_test1_setup;
+ break;
+ default:
+ rc = -EINVAL;
+ goto err_register;
+ }
+ pdev = &nfit_test->pdev;
+ pdev->name = KBUILD_MODNAME;
+ pdev->id = i;
+ pdev->dev.release = nfit_test_release;
+ rc = platform_device_register(pdev);
+ if (rc) {
+ put_device(&pdev->dev);
+ goto err_register;
+ }
+
+ rc = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
+ if (rc)
+ goto err_register;
+
+ instances[i] = nfit_test;
+
+ if (!once++) {
+ dma_addr_t dma;
+ void *buf;
+
+ buf = dma_alloc_coherent(&pdev->dev, SZ_128M, &dma,
+ GFP_KERNEL);
+ if (!buf) {
+ rc = -ENOMEM;
+ dev_warn(&pdev->dev, "need 128M of free cma\n");
+ goto err_register;
+ }
+ dma_free_coherent(&pdev->dev, SZ_128M, buf, dma);
+ }
+ }
+
+ rc = platform_driver_register(&nfit_test_driver);
+ if (rc)
+ goto err_register;
+ return 0;
+
+ err_register:
+ for (i = 0; i < NUM_NFITS; i++)
+ if (instances[i])
+ platform_device_unregister(&instances[i]->pdev);
+ nfit_test_teardown();
+ return rc;
+}
+
+static __exit void nfit_test_exit(void)
+{
+ int i;
+
+ platform_driver_unregister(&nfit_test_driver);
+ for (i = 0; i < NUM_NFITS; i++)
+ platform_device_unregister(&instances[i]->pdev);
+ nfit_test_teardown();
+}
+
+module_init(nfit_test_init);
+module_exit(nfit_test_exit);
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Intel Corporation");
diff --git a/tools/testing/nvdimm/test/nfit_test.h b/tools/testing/nvdimm/test/nfit_test.h
new file mode 100644
index 000000000000..4a1215ec45c0
--- /dev/null
+++ b/tools/testing/nvdimm/test/nfit_test.h
@@ -0,0 +1,28 @@
+/*
+ * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ */
+#ifndef __NFIT_TEST_H__
+#define __NFIT_TEST_H__
+
+struct nfit_test_resource {
+ struct list_head list;
+ struct resource *res;
+ struct device *dev;
+ void *buf;
+};
+
+typedef struct nfit_test_resource *(*nfit_test_lookup_fn)(resource_size_t);
+void __iomem *__wrap_ioremap_nocache(resource_size_t offset, unsigned long size);
+void __wrap_iounmap(volatile void __iomem *addr);
+void nfit_test_setup(nfit_test_lookup_fn lookup);
+void nfit_test_teardown(void);
+#endif
^ permalink raw reply related [flat|nested] 47+ messages in thread
* [PATCH v5 21/21] libnvdimm: Non-Volatile Devices
2015-06-02 0:14 [PATCH v5 00/21] libnvdimm: non-volatile memory devices Dan Williams
` (19 preceding siblings ...)
2015-06-02 0:15 ` [PATCH v5 20/21] tools/testing/nvdimm: manufactured NFITs for interface development Dan Williams
@ 2015-06-02 0:16 ` Dan Williams
20 siblings, 0 replies; 47+ messages in thread
From: Dan Williams @ 2015-06-02 0:16 UTC (permalink / raw)
To: linux-nvdimm
Cc: axboe, sfr, rafael, neilb, gregkh, linux-kernel, mingo,
linux-acpi, jmoyer, linux-api, akpm, hch
Maintainer information and documentation for drivers/nvdimm
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Boaz Harrosh <boaz@plexistor.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Jens Axboe <axboe@fb.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Neil Brown <neilb@suse.de>
Cc: Greg KH <gregkh@linuxfoundation.org>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
Documentation/nvdimm/nvdimm.txt | 805 +++++++++++++++++++++++++++++++++++++++
MAINTAINERS | 39 ++
2 files changed, 838 insertions(+), 6 deletions(-)
create mode 100644 Documentation/nvdimm/nvdimm.txt
diff --git a/Documentation/nvdimm/nvdimm.txt b/Documentation/nvdimm/nvdimm.txt
new file mode 100644
index 000000000000..854f0a7c96c5
--- /dev/null
+++ b/Documentation/nvdimm/nvdimm.txt
@@ -0,0 +1,805 @@
+ LIBNVDIMM: Non-Volatile Devices
+ libnvdimm - kernel / libndctl - userspace helper library
+ linux-nvdimm@lists.01.org
+ v12
+
+
+ Glossary
+ Overview
+ Supporting Documents
+ Git Trees
+ LIBNVDIMM PMEM and BLK
+ Why BLK?
+ PMEM vs BLK
+ BLK-REGIONs, PMEM-REGIONs, Atomic Sectors, and DAX
+ Example NVDIMM Platform
+ LIBNVDIMM Kernel Device Model and LIBNDCTL Userspace API
+ LIBNDCTL: Context
+ libndctl: instantiate a new library context example
+ LIBNVDIMM/LIBNDCTL: Bus
+ libnvdimm: control class device in /sys/class
+ libnvdimm: bus
+ libndctl: bus enumeration example
+ LIBNVDIMM/LIBNDCTL: DIMM (NMEM)
+ libnvdimm: DIMM (NMEM)
+ libndctl: DIMM enumeration example
+ LIBNVDIMM/LIBNDCTL: Region
+ libnvdimm: region
+ libndctl: region enumeration example
+ Why Not Encode the Region Type into the Region Name?
+ How Do I Determine the Major Type of a Region?
+ LIBNVDIMM/LIBNDCTL: Namespace
+ libnvdimm: namespace
+ libndctl: namespace enumeration example
+ libndctl: namespace creation example
+ Why the Term "namespace"?
+ LIBNVDIMM/LIBNDCTL: Block Translation Table "btt"
+ libnvdimm: btt layout
+ libndctl: btt creation example
+ Summary LIBNDCTL Diagram
+
+
+Glossary
+--------
+
+PMEM: A system-physical-address range where writes are persistent. A
+block device composed of PMEM is capable of DAX. A PMEM address range
+may span an interleave of several DIMMs.
+
+BLK: A set of one or more programmable memory mapped apertures provided
+by a DIMM to access its media. This indirection precludes the
+performance benefit of interleaving, but enables DIMM-bounded failure
+modes.
+
+DPA: DIMM Physical Address, is a DIMM-relative offset. With one DIMM in
+the system there would be a 1:1 system-physical-address:DPA association.
+Once more DIMMs are added a memory controller interleave must be
+decoded to determine the DPA associated with a given
+system-physical-address. BLK capacity always has a 1:1 relationship
+with a single-DIMM's DPA range.
+
+DAX: File system extensions to bypass the page cache and block layer to
+mmap persistent memory, from a PMEM block device, directly into a
+process address space.
+
+BTT: Block Translation Table: Persistent memory is byte addressable.
+Existing software may have an expectation that the power-fail-atomicity
+of writes is at least one sector, 512 bytes. The BTT is an indirection
+table with atomic update semantics to front a PMEM/BLK block device
+driver and present arbitrary atomic sector sizes.
+
+LABEL: Metadata stored on a DIMM device that partitions and identifies
+(persistently names) storage between PMEM and BLK. It also partitions
+BLK storage to host BTTs with different parameters per BLK-partition.
+Note that traditional partition tables, GPT/MBR, are layered on top of a
+BLK or PMEM device.
+
+
+Overview
+--------
+
+The LIBNVDIMM subsystem provides support for three types of NVDIMMs, namely,
+PMEM, BLK, and NVDIMM devices that can simultaneously support both PMEM
+and BLK mode access. These three modes of operation are described by
+the "NVDIMM Firmware Interface Table" (NFIT) in ACPI 6. While the LIBNVDIMM
+implementation is generic and supports pre-NFIT platforms, it was guided
+by the superset of capabilities need to support this ACPI 6 definition
+for NVDIMM resources. The bulk of the kernel implementation is in place
+to handle the case where DPA accessible via PMEM is aliased with DPA
+accessible via BLK. When that occurs a LABEL is needed to reserve DPA
+for exclusive access via one mode a time.
+
+Supporting Documents
+ACPI 6: http://www.uefi.org/sites/default/files/resources/ACPI_6.0.pdf
+NVDIMM Namespace: http://pmem.io/documents/NVDIMM_Namespace_Spec.pdf
+DSM Interface Example: http://pmem.io/documents/NVDIMM_DSM_Interface_Example.pdf
+Driver Writer's Guide: http://pmem.io/documents/NVDIMM_Driver_Writers_Guide.pdf
+
+Git Trees
+LIBNVDIMM: https://git.kernel.org/cgit/linux/kernel/git/djbw/nvdimm.git
+LIBNDCTL: https://github.com/pmem/ndctl.git
+PMEM: https://github.com/01org/prd
+
+
+LIBNVDIMM PMEM and BLK
+------------------
+
+Prior to the arrival of the NFIT, non-volatile memory was described to a
+system in various ad-hoc ways. Usually only the bare minimum was
+provided, namely, a single system-physical-address range where writes
+are expected to be durable after a system power loss. Now, the NFIT
+specification standardizes not only the description of PMEM, but also
+BLK and platform message-passing entry points for control and
+configuration.
+
+For each NVDIMM access method (PMEM, BLK), LIBNVDIMM provides a block
+device driver:
+
+ 1. PMEM (nd_pmem.ko): Drives a system-physical-address range. This
+ range is contiguous in system memory and may be interleaved (hardware
+ memory controller striped) across multiple DIMMs. When interleaved the
+ platform may optionally provide details of which DIMMs are participating
+ in the interleave.
+
+ Note that while LIBNVDIMM describes system-physical-address ranges that may
+ alias with BLK access as ND_NAMESPACE_PMEM ranges and those without
+ alias as ND_NAMESPACE_IO ranges, to the nd_pmem driver there is no
+ distinction. The different device-types are an implementation detail
+ that userspace can exploit to implement policies like "only interface
+ with address ranges from certain DIMMs". It is worth noting that when
+ aliasing is present and a DIMM lacks a label, then no block device can
+ be created by default as userspace needs to do at least one allocation
+ of DPA to the PMEM range. In contrast ND_NAMESPACE_IO ranges, once
+ registered, can be immediately attached to nd_pmem.
+
+ 2. BLK (nd_blk.ko): This driver performs I/O using a set of platform
+ defined apertures. A set of apertures will all access just one DIMM.
+ Multiple windows allow multiple concurrent accesses, much like
+ tagged-command-queuing, and would likely be used by different threads or
+ different CPUs.
+
+ The NFIT specification defines a standard format for a BLK-aperture, but
+ the spec also allows for vendor specific layouts, and non-NFIT BLK
+ implementations may other designs for BLK I/O. For this reason "nd_blk"
+ calls back into platform-specific code to perform the I/O. One such
+ implementation is defined in the "Driver Writer's Guide" and "DSM
+ Interface Example".
+
+
+Why BLK?
+--------
+
+While PMEM provides direct byte-addressable CPU-load/store access to
+NVDIMM storage, it does not provide the best system RAS (recovery,
+availability, and serviceability) model. An access to a corrupted
+system-physical-address address causes a cpu exception while an access
+to a corrupted address through an BLK-aperture causes that block window
+to raise an error status in a register. The latter is more aligned with
+the standard error model that host-bus-adapter attached disks present.
+Also, if an administrator ever wants to replace a memory it is easier to
+service a system at DIMM module boundaries. Compare this to PMEM where
+data could be interleaved in an opaque hardware specific manner across
+several DIMMs.
+
+PMEM vs BLK
+BLK-apertures solve this RAS problem, but their presence is also the
+major contributing factor to the complexity of the ND subsystem. They
+complicate the implementation because PMEM and BLK alias in DPA space.
+Any given DIMM's DPA-range may contribute to one or more
+system-physical-address sets of interleaved DIMMs, *and* may also be
+accessed in its entirety through its BLK-aperture. Accessing a DPA
+through a system-physical-address while simultaneously accessing the
+same DPA through a BLK-aperture has undefined results. For this reason,
+DIMMs with this dual interface configuration include a DSM function to
+store/retrieve a LABEL. The LABEL effectively partitions the DPA-space
+into exclusive system-physical-address and BLK-aperture accessible
+regions. For simplicity a DIMM is allowed a PMEM "region" per each
+interleave set in which it is a member. The remaining DPA space can be
+carved into an arbitrary number of BLK devices with discontiguous
+extents.
+
+BLK-REGIONs, PMEM-REGIONs, Atomic Sectors, and DAX
+--------------------------------------------------
+
+One of the few
+reasons to allow multiple BLK namespaces per REGION is so that each
+BLK-namespace can be configured with a BTT with unique atomic sector
+sizes. While a PMEM device can host a BTT the LABEL specification does
+not provide for a sector size to be specified for a PMEM namespace.
+This is due to the expectation that the primary usage model for PMEM is
+via DAX, and the BTT is incompatible with DAX. However, for the cases
+where an application or filesystem still needs atomic sector update
+guarantees it can register a BTT on a PMEM device or partition. See
+LIBNVDIMM/NDCTL: Block Translation Table "btt"
+
+
+Example NVDIMM Platform
+-----------------------
+
+For the remainder of this document the following diagram will be
+referenced for any example sysfs layouts.
+
+
+ (a) (b) DIMM BLK-REGION
+ +-------------------+--------+--------+--------+
++------+ | pm0.0 | blk2.0 | pm1.0 | blk2.1 | 0 region2
+| imc0 +--+- - - region0- - - +--------+ +--------+
++--+---+ | pm0.0 | blk3.0 | pm1.0 | blk3.1 | 1 region3
+ | +-------------------+--------v v--------+
++--+---+ | |
+| cpu0 | region1
++--+---+ | |
+ | +----------------------------^ ^--------+
++--+---+ | blk4.0 | pm1.0 | blk4.0 | 2 region4
+| imc1 +--+----------------------------| +--------+
++------+ | blk5.0 | pm1.0 | blk5.0 | 3 region5
+ +----------------------------+--------+--------+
+
+In this platform we have four DIMMs and two memory controllers in one
+socket. Each unique interface (BLK or PMEM) to DPA space is identified
+by a region device with a dynamically assigned id (REGION0 - REGION5).
+
+ 1. The first portion of DIMM0 and DIMM1 are interleaved as REGION0. A
+ single PMEM namespace is created in the REGION0-SPA-range that spans
+ DIMM0 and DIMM1 with a user-specified name of "pm0.0". Some of that
+ interleaved system-physical-address range is reclaimed as BLK-aperture
+ accessed space starting at DPA-offset (a) into each DIMM. In that
+ reclaimed space we create two BLK-aperture "namespaces" from REGION2 and
+ REGION3 where "blk2.0" and "blk3.0" are just human readable names that
+ could be set to any user-desired name in the LABEL.
+
+ 2. In the last portion of DIMM0 and DIMM1 we have an interleaved
+ system-physical-address range, REGION1, that spans those two DIMMs as
+ well as DIMM2 and DIMM3. Some of REGION1 allocated to a PMEM namespace
+ named "pm1.0" the rest is reclaimed in 4 BLK-aperture namespaces (for
+ each DIMM in the interleave set), "blk2.1", "blk3.1", "blk4.0", and
+ "blk5.0".
+
+ 3. The portion of DIMM2 and DIMM3 that do not participate in the REGION1
+ interleaved system-physical-address range (i.e. the DPA address below
+ offset (b) are also included in the "blk4.0" and "blk5.0" namespaces.
+ Note, that this example shows that BLK-aperture namespaces don't need to
+ be contiguous in DPA-space.
+
+ This bus is provided by the kernel under the device
+ /sys/devices/platform/nfit_test.0 when CONFIG_NFIT_TEST is enabled and
+ the nfit_test.ko module is loaded. This not only test LIBNVDIMM but the
+ acpi_nfit.ko driver as well.
+
+
+LIBNVDIMM Kernel Device Model and LIBNDCTL Userspace API
+----------------------------------------------------
+
+What follows is a description of the LIBNVDIMM sysfs layout and a
+corresponding object hierarchy diagram as viewed through the LIBNDCTL
+api. The example sysfs paths and diagrams are relative to the Example
+NVDIMM Platform which is also the LIBNVDIMM bus used in the LIBNDCTL unit
+test.
+
+LIBNDCTL: Context
+Every api call in the LIBNDCTL library requires a context that holds the
+logging parameters and other library instance state. The library is
+based on the libabc template:
+https://git.kernel.org/cgit/linux/kernel/git/kay/libabc.git/
+
+LIBNDCTL: instantiate a new library context example
+
+ struct ndctl_ctx *ctx;
+
+ if (ndctl_new(&ctx) == 0)
+ return ctx;
+ else
+ return NULL;
+
+LIBNVDIMM/LIBNDCTL: Bus
+-------------------
+
+A bus has a 1:1 relationship with an NFIT. The current expectation for
+ACPI based systems is that there is only ever one platform-global NFIT.
+That said, it is trivial to register multiple NFITs, the specification
+does not preclude it. The infrastructure supports multiple busses and
+we we use this capability to test multiple NFIT configurations in the
+unit test.
+
+LIBNVDIMM: control class device in /sys/class
+
+This character device accepts DSM messages to be passed to DIMM
+identified by its NFIT handle.
+
+ /sys/class/nd/ndctl0
+ |-- dev
+ |-- device -> ../../../ndbus0
+ |-- subsystem -> ../../../../../../../class/nd
+
+
+
+LIBNVDIMM: bus
+
+ struct nvdimm_bus *nvdimm_bus_register(struct device *parent,
+ struct nvdimm_bus_descriptor *nfit_desc);
+
+ /sys/devices/platform/nfit_test.0/ndbus0
+ |-- btt0
+ |-- btt_seed
+ |-- commands
+ |-- nd
+ |-- nfit
+ |-- nmem0
+ |-- nmem1
+ |-- nmem2
+ |-- nmem3
+ |-- power
+ |-- provider
+ |-- region0
+ |-- region1
+ |-- region2
+ |-- region3
+ |-- region4
+ |-- region5
+ |-- uevent
+ `-- wait_probe
+
+LIBNDCTL: bus enumeration example
+Find the bus handle that describes the bus from Example NVDIMM Platform
+
+ static struct ndctl_bus *get_bus_by_provider(struct ndctl_ctx *ctx,
+ const char *provider)
+ {
+ struct ndctl_bus *bus;
+
+ ndctl_bus_foreach(ctx, bus)
+ if (strcmp(provider, ndctl_bus_get_provider(bus)) == 0)
+ return bus;
+
+ return NULL;
+ }
+
+ bus = get_bus_by_provider(ctx, "nfit_test.0");
+
+
+LIBNVDIMM/LIBNDCTL: DIMM (NMEM)
+---------------------------
+
+The DIMM device provides a character device for sending commands to
+hardware, and it is a container for LABELs. If the DIMM is defined by
+NFIT then an optional 'nfit' attribute sub-directory is available to add
+NFIT-specifics.
+
+Note that the kernel device name for "DIMMs" is "nmemX". The NFIT
+describes these devices via "Memory Device to System Physical Address
+Range Mapping Structure", and there is no requirement that they actually
+be physical DIMMs, so we use a more generic name.
+
+LIBNVDIMM: DIMM (NMEM)
+
+ struct nvdimm *nvdimm_create(struct nvdimm_bus *nvdimm_bus, void *provider_data,
+ const struct attribute_group **groups, unsigned long flags,
+ unsigned long *dsm_mask);
+
+ /sys/devices/platform/nfit_test.0/ndbus0
+ |-- nmem0
+ | |-- available_slots
+ | |-- commands
+ | |-- dev
+ | |-- devtype
+ | |-- driver -> ../../../../../bus/nd/drivers/nvdimm
+ | |-- modalias
+ | |-- nfit
+ | | |-- device
+ | | |-- format
+ | | |-- handle
+ | | |-- phys_id
+ | | |-- rev_id
+ | | |-- serial
+ | | `-- vendor
+ | |-- state
+ | |-- subsystem -> ../../../../../bus/nd
+ | `-- uevent
+ |-- nmem1
+ [..]
+
+
+LIBNDCTL: DIMM enumeration example
+
+Note, in this example we are assuming NFIT-defined DIMMs which are
+identified by an "nfit_handle" a 32-bit value where:
+Bit 3:0 DIMM number within the memory channel
+Bit 7:4 memory channel number
+Bit 11:8 memory controller ID
+Bit 15:12 socket ID (within scope of a Node controller if node controller is present)
+Bit 27:16 Node Controller ID
+Bit 31:28 Reserved
+
+ static struct ndctl_dimm *get_dimm_by_handle(struct ndctl_bus *bus,
+ unsigned int handle)
+ {
+ struct ndctl_dimm *dimm;
+
+ ndctl_dimm_foreach(bus, dimm)
+ if (ndctl_dimm_get_handle(dimm) == handle)
+ return dimm;
+
+ return NULL;
+ }
+
+ #define DIMM_HANDLE(n, s, i, c, d) \
+ (((n & 0xfff) << 16) | ((s & 0xf) << 12) | ((i & 0xf) << 8) \
+ | ((c & 0xf) << 4) | (d & 0xf))
+
+ dimm = get_dimm_by_handle(bus, DIMM_HANDLE(0, 0, 0, 0, 0));
+
+LIBNVDIMM/LIBNDCTL: Region
+----------------------
+
+A generic REGION device is registered for each PMEM range orBLK-aperture
+set. Per the example there are 6 regions: 2 PMEM and 4 BLK-aperture
+sets on the "nfit_test.0" bus. The primary role of regions are to be a
+container of "mappings". A mapping is a tuple of <DIMM,
+DPA-start-offset, length>.
+
+LIBNVDIMM provides a built-in driver for these REGION devices. This driver
+is responsible for reconciling the aliased DPA mappings across all
+regions, parsing the LABEL, if present, and then emitting NAMESPACE
+devices with the resolved/exclusive DPA-boundaries for the nd_pmem or
+nd_blk device driver to consume.
+
+In addition to the generic attributes of "mapping"s, "interleave_ways"
+and "size" the REGION device also exports some convenience attributes.
+"nstype" indicates the integer type of namespace-device this region
+emits, "devtype" duplicates the DEVTYPE variable stored by udev at the
+'add' event, "modalias" duplicates the MODALIAS variable stored by udev
+at the 'add' event, and finally, the optional "spa_index" is provided in
+the case where the region is defined by a SPA.
+
+LIBNVDIMM: region
+
+ struct nd_region *nvdimm_pmem_region_create(struct nvdimm_bus *nvdimm_bus,
+ struct nd_region_desc *ndr_desc);
+ struct nd_region *nvdimm_blk_region_create(struct nvdimm_bus *nvdimm_bus,
+ struct nd_region_desc *ndr_desc);
+
+ /sys/devices/platform/nfit_test.0/ndbus0
+ |-- region0
+ | |-- available_size
+ | |-- devtype
+ | |-- driver -> ../../../../../bus/nd/drivers/nd_region
+ | |-- init_namespaces
+ | |-- mapping0
+ | |-- mapping1
+ | |-- mappings
+ | |-- modalias
+ | |-- namespace0.0
+ | |-- namespace_seed
+ | |-- nfit
+ | | `-- spa_index
+ | |-- nstype
+ | |-- set_cookie
+ | |-- size
+ | |-- subsystem -> ../../../../../bus/nd
+ | `-- uevent
+ |-- region1
+ [..]
+
+LIBNDCTL: region enumeration example
+
+Sample region retrieval routines based on NFIT-unique data like
+"spa_index" (interleave set id) for PMEM and "nfit_handle" (dimm id) for
+BLK.
+
+ static struct ndctl_region *get_pmem_region_by_spa_index(struct ndctl_bus *bus,
+ unsigned int spa_index)
+ {
+ struct ndctl_region *region;
+
+ ndctl_region_foreach(bus, region) {
+ if (ndctl_region_get_type(region) != ND_DEVICE_REGION_PMEM)
+ continue;
+ if (ndctl_region_get_spa_index(region) == spa_index)
+ return region;
+ }
+ return NULL;
+ }
+
+ static struct ndctl_region *get_blk_region_by_dimm_handle(struct ndctl_bus *bus,
+ unsigned int handle)
+ {
+ struct ndctl_region *region;
+
+ ndctl_region_foreach(bus, region) {
+ struct ndctl_mapping *map;
+
+ if (ndctl_region_get_type(region) != ND_DEVICE_REGION_BLOCK)
+ continue;
+ ndctl_mapping_foreach(region, map) {
+ struct ndctl_dimm *dimm = ndctl_mapping_get_dimm(map);
+
+ if (ndctl_dimm_get_handle(dimm) == handle)
+ return region;
+ }
+ }
+ return NULL;
+ }
+
+
+Why Not Encode the Region Type into the Region Name?
+----------------------------------------------------
+
+At first glance it seems since NFIT defines just PMEM and BLK interface
+types that we should simply name REGION devices with something derived
+from those type names. However, the ND subsystem explicitly keeps the
+REGION name generic and expects userspace to always consider the
+region-attributes for 4 reasons:
+
+ 1. There are already more than two REGION and "namespace" types. For
+ PMEM there are two subtypes. As mentioned previously we have PMEM where
+ the constituent DIMM devices are known and anonymous PMEM. For BLK
+ regions the NFIT specification already anticipates vendor specific
+ implementations. The exact distinction of what a region contains is in
+ the region-attributes not the region-name or the region-devtype.
+
+ 2. A region with zero child-namespaces is a possible configuration. For
+ example, the NFIT allows for a DCR to be published without a
+ corresponding BLK-aperture. This equates to a DIMM that can only accept
+ control/configuration messages, but no i/o through a descendant block
+ device. Again, this "type" is advertised in the attributes ('mappings'
+ == 0) and the name does not tell you much.
+
+ 3. What if a third major interface type arises in the future? Outside
+ of vendor specific implementations, it's not difficult to envision a
+ third class of interface type beyond BLK and PMEM. With a generic name
+ for the REGION level of the device-hierarchy old userspace
+ implementations can still make sense of new kernel advertised
+ region-types. Userspace can always rely on the generic region
+ attributes like "mappings", "size", etc and the expected child devices
+ named "namespace". This generic format of the device-model hierarchy
+ allows the LIBNVDIMM and LIBNDCTL implementations to be more uniform and
+ future-proof.
+
+ 4. There are more robust mechanisms for determining the major type of a
+ region than a device name. See the next section, How Do I Determine the
+ Major Type of a Region?
+
+How Do I Determine the Major Type of a Region?
+----------------------------------------------
+
+Outside of the blanket recommendation of "use libndctl", or simply
+looking at the kernel header (/usr/include/linux/ndctl.h) to decode the
+"nstype" integer attribute, here are some other options.
+
+ 1. module alias lookup:
+
+ The whole point of region/namespace device type differentiation is to
+ decide which block-device driver will attach to a given LIBNVDIMM namespace.
+ One can simply use the modalias to lookup the resulting module. It's
+ important to note that this method is robust in the presence of a
+ vendor-specific driver down the road. If a vendor-specific
+ implementation wants to supplant the standard nd_blk driver it can with
+ minimal impact to the rest of LIBNVDIMM.
+
+ In fact, a vendor may also want to have a vendor-specific region-driver
+ (outside of nd_region). For example, if a vendor defined its own LABEL
+ format it would need its own region driver to parse that LABEL and emit
+ the resulting namespaces. The output from module resolution is more
+ accurate than a region-name or region-devtype.
+
+ 2. udev:
+
+ The kernel "devtype" is registered in the udev database
+ # udevadm info --path=/devices/platform/nfit_test.0/ndbus0/region0
+ P: /devices/platform/nfit_test.0/ndbus0/region0
+ E: DEVPATH=/devices/platform/nfit_test.0/ndbus0/region0
+ E: DEVTYPE=nd_pmem
+ E: MODALIAS=nd:t2
+ E: SUBSYSTEM=nd
+
+ # udevadm info --path=/devices/platform/nfit_test.0/ndbus0/region4
+ P: /devices/platform/nfit_test.0/ndbus0/region4
+ E: DEVPATH=/devices/platform/nfit_test.0/ndbus0/region4
+ E: DEVTYPE=nd_blk
+ E: MODALIAS=nd:t3
+ E: SUBSYSTEM=nd
+
+ ...and is available as a region attribute, but keep in mind that the
+ "devtype" does not indicate sub-type variations and scripts should
+ really be understanding the other attributes.
+
+ 3. type specific attributes:
+
+ As it currently stands a BLK-aperture region will never have a
+ "nfit/spa_index" attribute, but neither will a non-NFIT PMEM region. A
+ BLK region with a "mappings" value of 0 is, as mentioned above, a DIMM
+ that does not allow I/O. A PMEM region with a "mappings" value of zero
+ is a simple system-physical-address range.
+
+
+LIBNVDIMM/LIBNDCTL: Namespace
+-------------------------
+
+A REGION, after resolving DPA aliasing and LABEL specified boundaries,
+surfaces one or more "namespace" devices. The arrival of a "namespace"
+device currently triggers either the nd_blk or nd_pmem driver to load
+and register a disk/block device.
+
+LIBNVDIMM: namespace
+Here is a sample layout from the three major types of NAMESPACE where
+namespace0.0 represents DIMM-info-backed PMEM (note that it has a 'uuid'
+attribute), namespace2.0 represents a BLK namespace (note it has a
+'sector_size' attribute) that, and namespace6.0 represents an anonymous
+PMEM namespace (note that has no 'uuid' attribute due to not support a
+LABEL).
+
+ /sys/devices/platform/nfit_test.0/ndbus0/region0/namespace0.0
+ |-- alt_name
+ |-- devtype
+ |-- dpa_extents
+ |-- modalias
+ |-- resource
+ |-- size
+ |-- subsystem -> ../../../../../../bus/nd
+ |-- type
+ |-- uevent
+ `-- uuid
+ /sys/devices/platform/nfit_test.0/ndbus0/region2/namespace2.0
+ |-- alt_name
+ |-- devtype
+ |-- dpa_extents
+ |-- modalias
+ |-- sector_size
+ |-- size
+ |-- subsystem -> ../../../../../../bus/nd
+ |-- type
+ |-- uevent
+ `-- uuid
+ /sys/devices/platform/nfit_test.1/ndbus1/region6/namespace6.0
+ |-- block
+ | `-- pmem0
+ |-- devtype
+ |-- driver -> ../../../../../../bus/nd/drivers/pmem
+ |-- modalias
+ |-- resource
+ |-- size
+ |-- subsystem -> ../../../../../../bus/nd
+ |-- type
+ `-- uevent
+
+LIBNDCTL: namespace enumeration example
+Namespaces are indexed relative to their parent region, example below.
+These indexes are mostly static from boot to boot, but subsystem makes
+no guarantees in this regard. For a static namespace identifier use its
+'uuid' attribute.
+
+static struct ndctl_namespace *get_namespace_by_id(struct ndctl_region *region,
+ unsigned int id)
+{
+ struct ndctl_namespace *ndns;
+
+ ndctl_namespace_foreach(region, ndns)
+ if (ndctl_namespace_get_id(ndns) == id)
+ return ndns;
+
+ return NULL;
+}
+
+LIBNDCTL: namespace creation example
+Idle namespaces are automatically created by the kernel if a given
+region has enough available capacity to create a new namespace.
+Namespace instantiation involves finding an idle namespace and
+configuring it. For the most part the setting of namespace attributes
+can occur in any order, the only constraint is that 'uuid' must be set
+before 'size'. This enables the kernel to track DPA allocations
+internally with a static identifier.
+
+static int configure_namespace(struct ndctl_region *region,
+ struct ndctl_namespace *ndns,
+ struct namespace_parameters *parameters)
+{
+ char devname[50];
+
+ snprintf(devname, sizeof(devname), "namespace%d.%d",
+ ndctl_region_get_id(region), paramaters->id);
+
+ ndctl_namespace_set_alt_name(ndns, devname);
+ /* 'uuid' must be set prior to setting size! */
+ ndctl_namespace_set_uuid(ndns, paramaters->uuid);
+ ndctl_namespace_set_size(ndns, paramaters->size);
+ /* unlike pmem namespaces, blk namespaces have a sector size */
+ if (parameters->lbasize)
+ ndctl_namespace_set_sector_size(ndns, parameters->lbasize);
+ ndctl_namespace_enable(ndns);
+}
+
+
+Why the Term "namespace"?
+
+ 1. Why not "volume" for instance? "volume" ran the risk of confusing ND
+ as a volume manager like device-mapper.
+
+ 2. The term originated to describe the sub-devices that can be created
+ within a NVME controller (see the nvme specification:
+ http://www.nvmexpress.org/specifications/), and NFIT namespaces are
+ meant to parallel the capabilities and configurability of
+ NVME-namespaces.
+
+
+LIBNVDIMM/LIBNDCTL: Block Translation Table "btt"
+---------------------------------------------
+
+A BTT (design document: http://pmem.io/2014/09/23/btt.html) is a stacked
+block device driver that fronts either the whole block device or a
+partition of a block device emitted by either a PMEM or BLK NAMESPACE.
+
+LIBNVDIMM: btt layout
+Every bus will start out with at least one BTT device which is the seed
+device. To activate it set the "backing_dev", "uuid", and "sector_size"
+attributes and then bind the device to the nd_btt driver.
+
+ /sys/devices/platform/nfit_test.1/ndbus0/btt0/
+ |-- backing_dev
+ |-- delete
+ |-- devtype
+ |-- modalias
+ |-- sector_size
+ |-- subsystem -> ../../../../../bus/nd
+ |-- uevent
+ `-- uuid
+
+LIBNDCTL: btt creation example
+Similar to namespaces an idle BTT device is automatically created per
+bus. Each time this "seed" btt device is configured and enabled a new
+seed is created. Creating a BTT configuration involves two steps of
+finding and idle BTT and assigning it to front a PMEM or BLK namespace.
+
+ static struct ndctl_btt *get_idle_btt(struct ndctl_bus *bus)
+ {
+ struct ndctl_btt *btt;
+
+ ndctl_btt_foreach(bus, btt)
+ if (!ndctl_btt_is_enabled(btt) && !ndctl_btt_is_configured(btt))
+ return btt;
+
+ return NULL;
+ }
+
+ static int configure_btt(struct ndctl_bus *bus, struct btt_parameters *parameters)
+ {
+ btt = get_idle_btt(bus);
+
+ sprintf(bdevpath, "/dev/%s",
+ ndctl_namespace_get_block_device(parameters->ndns));
+ ndctl_btt_set_uuid(btt, parameters->uuid);
+ ndctl_btt_set_sector_size(btt, parameters->sector_size);
+ ndctl_btt_set_backing_dev(btt, parameters->bdevpath);
+ ndctl_btt_enable(btt);
+ }
+
+Once instantiated a "nd_btt" link will be created under the
+"backing_dev" (pmem0) block device:
+
+ /sys/block/pmem0/
+ |-- alignment_offset
+ |-- bdi -> ../../../../../../../virtual/bdi/259:0
+ |-- capability
+ |-- dev
+ |-- device -> ../../../namespace0.0
+ |-- discard_alignment
+ |-- ext_range
+ |-- holders
+ |-- inflight
+ |-- nd_btt -> ../../../../btt0
+
+...and a new inactive seed device will appear on the bus.
+
+Once a "backing_dev" is disabled its associated BTT will be
+automatically deleted. This deletion is only at the device model level.
+In order to destroy a BTT the "info block" needs to be destroyed.
+
+
+Summary LIBNDCTL Diagram
+------------------------
+
+For the given example above, here is the view of the objects as seen by the LIBNDCTL api:
+ +---+
+ |CTX| +---------+ +--------------+ +---------------+
+ +-+-+ +-> REGION0 +---> NAMESPACE0.0 +--> PMEM8 "pm0.0" |
+ | | +---------+ +--------------+ +---------------+
++-------+ | | +---------+ +--------------+ +---------------+
+| DIMM0 <-+ | +-> REGION1 +---> NAMESPACE1.0 +--> PMEM6 "pm1.0" |
++-------+ | | | +---------+ +--------------+ +---------------+
+| DIMM1 <-+ +-v--+ | +---------+ +--------------+ +---------------+
++-------+ +-+BUS0+---> REGION2 +-+-> NAMESPACE2.0 +--> ND6 "blk2.0" |
+| DIMM2 <-+ +----+ | +---------+ | +--------------+ +----------------------+
++-------+ | | +-> NAMESPACE2.1 +--> ND5 "blk2.1" | BTT2 |
+| DIMM3 <-+ | +--------------+ +----------------------+
++-------+ | +---------+ +--------------+ +---------------+
+ +-> REGION3 +-+-> NAMESPACE3.0 +--> ND4 "blk3.0" |
+ | +---------+ | +--------------+ +----------------------+
+ | +-> NAMESPACE3.1 +--> ND3 "blk3.1" | BTT1 |
+ | +--------------+ +----------------------+
+ | +---------+ +--------------+ +---------------+
+ +-> REGION4 +---> NAMESPACE4.0 +--> ND2 "blk4.0" |
+ | +---------+ +--------------+ +---------------+
+ | +---------+ +--------------+ +----------------------+
+ +-> REGION5 +---> NAMESPACE5.0 +--> ND1 "blk5.0" | BTT0 |
+ +---------+ +--------------+ +---------------+------+
+
+
diff --git a/MAINTAINERS b/MAINTAINERS
index 590304b96b03..d7aa8c9c01c5 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -5912,6 +5912,39 @@ M: Sasha Levin <sasha.levin@oracle.com>
S: Maintained
F: tools/lib/lockdep/
+LIBNVDIMM: NON-VOLATILE MEMORY DEVICE SUBSYSTEM
+M: Dan Williams <dan.j.williams@intel.com>
+L: linux-nvdimm@lists.01.org
+Q: https://patchwork.kernel.org/project/linux-nvdimm/list/
+S: Supported
+F: drivers/nvdimm/*
+F: include/linux/nd.h
+F: include/linux/libnvdimm.h
+F: include/uapi/linux/ndctl.h
+
+LIBNVDIMM BLK: MMIO-APERTURE DRIVER
+M: Ross Zwisler <ross.zwisler@linux.intel.com>
+L: linux-nvdimm@lists.01.org
+Q: https://patchwork.kernel.org/project/linux-nvdimm/list/
+S: Supported
+F: drivers/nvdimm/blk.c
+F: drivers/nvdimm/region_devs.c
+F: drivers/acpi/nfit*
+
+LIBNVDIMM BTT: BLOCK TRANSLATION TABLE
+M: Vishal Verma <vishal.verma@linux.intel.com>
+L: linux-nvdimm@lists.01.org
+Q: https://patchwork.kernel.org/project/linux-nvdimm/list/
+S: Supported
+F: drivers/nvdimm/btt*
+
+LIBNVDIMM PMEM: PERSISTENT MEMORY DRIVER
+M: Ross Zwisler <ross.zwisler@linux.intel.com>
+L: linux-nvdimm@lists.01.org
+Q: https://patchwork.kernel.org/project/linux-nvdimm/list/
+S: Supported
+F: drivers/nvdimm/pmem.c
+
LINUX FOR IBM pSERIES (RS/6000)
M: Paul Mackerras <paulus@au.ibm.com>
W: http://www.ibm.com/linux/ltc/projects/ppc
@@ -8136,12 +8169,6 @@ S: Maintained
F: Documentation/blockdev/ramdisk.txt
F: drivers/block/brd.c
-PERSISTENT MEMORY DRIVER
-M: Ross Zwisler <ross.zwisler@linux.intel.com>
-L: linux-nvdimm@lists.01.org
-S: Supported
-F: drivers/block/pmem.c
-
RANDOM NUMBER DRIVER
M: "Theodore Ts'o" <tytso@mit.edu>
S: Maintained
^ permalink raw reply related [flat|nested] 47+ messages in thread
* Re: [PATCH v5 09/21] libnvdimm, nd_pmem: add libnvdimm support to the pmem driver
2015-06-02 0:14 ` [PATCH v5 09/21] libnvdimm, nd_pmem: add libnvdimm support to the pmem driver Dan Williams
@ 2015-06-03 7:44 ` Christoph Hellwig
2015-06-03 19:31 ` Williams, Dan J
0 siblings, 1 reply; 47+ messages in thread
From: Christoph Hellwig @ 2015-06-03 7:44 UTC (permalink / raw)
To: Dan Williams
Cc: linux-nvdimm, axboe, sfr, rafael, neilb, gregkh, linux-kernel,
hch, linux-acpi, linux-api, akpm, mingo
This patch doesn't apply, as it seems to use some git magic.
But looking at it it's also wrong in that it mixes a file move
and actual changes to the file.
^ permalink raw reply [flat|nested] 47+ messages in thread
* Re: [PATCH v5 02/21] libnvdimm, nfit: initial libnvdimm infrastructure and NFIT support
2015-06-02 0:14 ` [PATCH v5 02/21] libnvdimm, nfit: initial libnvdimm infrastructure and NFIT support Dan Williams
@ 2015-06-03 14:57 ` Christoph Hellwig
2015-06-03 19:24 ` Williams, Dan J
0 siblings, 1 reply; 47+ messages in thread
From: Christoph Hellwig @ 2015-06-03 14:57 UTC (permalink / raw)
To: Dan Williams
Cc: linux-nvdimm, axboe, sfr, rafael, neilb, gregkh, linux-kernel,
mingo, linux-acpi, jmoyer, linux-api, akpm, hch
On Mon, Jun 01, 2015 at 08:14:19PM -0400, Dan Williams wrote:
> A libnvdimm bus is the anchor device for registering nvdimm resources and
> interfaces, for example, a character control device, nvdimm devices,
> and I/O region devices. The ACPI NFIT (NVDIMM Firmware Interface Table)
> is one possible platform description for such non-volatile memory
> resources in a system. The nfit.ko driver attaches to the "ACPI0012"
> device that indicates the presence of the NFIT and parses the table to
> register a libnvdimm bus instance.
Havin lib in a name of a bus seems odd. Why not simply the nvdimm bus?
Also this seems to both have the generic nvdimm infrastructure as well
as the acpi wiring. Might make sense to split this into two patches?
> +config ACPI_NFIT
> + tristate "ACPI NVDIMM Firmware Interface Table (NFIT)"
> + depends on PHYS_ADDR_T_64BIT
> + depends on BLK_DEV
> + select NVDIMM_DEVICES
> + select LIBNVDIMM
Is this the right way for the user to chose it? It seems like enabling
the NVMDIMM subsystem would be the obvious choice, and ACPI would
simply enable the table parsing in that case.
> +static u8 nfit_uuid[NFIT_UUID_MAX][16];
Should this use the uuid_le type?
> +static const char *spa_type_name(u16 type)
> +{
> + switch (type) {
> + case NFIT_SPA_VOLATILE: return "volatile";
> + case NFIT_SPA_PM: return "pmem";
> + case NFIT_SPA_DCR: return "dimm-control-region";
> + case NFIT_SPA_BDW: return "block-data-window";
> + default: return "unknown";
Please never put code on the same line as a switch (or goto) label.
> +static void *add_table(struct acpi_nfit_desc *acpi_desc, void *table, const void *end)
> +{
> + struct device *dev = acpi_desc->dev;
> + struct acpi_nfit_header *hdr;
> + void *err = ERR_PTR(-ENOMEM);
> +
> + if (table >= end)
> + return NULL;
> +
> + hdr = (struct acpi_nfit_header *) table;
No need to case from void * to another pointer type.
> + switch (hdr->type) {
> + case ACPI_NFIT_TYPE_SYSTEM_ADDRESS: {
> + struct nfit_spa *nfit_spa = devm_kzalloc(dev, sizeof(*nfit_spa),
> + GFP_KERNEL);
> + struct acpi_nfit_system_address *spa = table;
> +
> + if (!nfit_spa)
> + return err;
> + INIT_LIST_HEAD(&nfit_spa->list);
> + nfit_spa->spa = spa;
> + list_add_tail(&nfit_spa->list, &acpi_desc->spas);
> + dev_dbg(dev, "%s: spa index: %d type: %s\n", __func__,
> + spa->range_index,
> + spa_type_name(nfit_spa_type(spa)));
If you need local variables inside a switch statement you probably
want to split each case into a separate helper function.
> +static inline struct acpi_nfit_memory_map *__to_nfit_memdev(struct nfit_mem *nfit_mem)
This line is over 80 characters.
Also why the odd __-prefix?
> new file mode 100644
> index 000000000000..24b51dbc8215
> --- /dev/null
> +++ b/drivers/nvdimm/Kconfig
> @@ -0,0 +1,20 @@
> +menuconfig NVDIMM_DEVICES
> + bool "NVDIMM (Non-Volatile Memory Device) Support"
> + help
> + Generic support for non-volatile memory devices including
> + ACPI-6-NFIT defined resources. On platforms that define an
> + NFIT, or otherwise can discover NVDIMM resources, a libnvdimm
> + bus is registered to advertise PMEM (persistent memory)
> + namespaces (/dev/pmemX) and BLK (sliding mmio window(s))
> + namespaces (/dev/ndX). A PMEM namespace refers to a memory
> + resource that may span multiple DIMMs and support DAX (see
> + CONFIG_DAX). A BLK namespace refers to an NVDIMM control
> + region which exposes an mmio register set for windowed
> + access mode to non-volatile memory.
> +
> +if NVDIMM_DEVICES
> +
> +config LIBNVDIMM
> + tristate
> +
> +endif
What different meanings will CONFIG_NVDIMM_DEVICES and CONFIG_LIBNVDIMM
have?
> diff --git a/drivers/nvdimm/nd-private.h b/drivers/nvdimm/nd-private.h
> new file mode 100644
> index 000000000000..e7c4e99a22a4
> --- /dev/null
> +++ b/drivers/nvdimm/nd-private.h
No need for -private if you're already under drivers/nvdimm..
> +#ifndef __ND_PRIVATE_H__
> +#define __ND_PRIVATE_H__
> +#include <linux/libnvdimm.h>
> +#include <linux/device.h>
> +
> +struct nvdimm_bus {
> + struct nvdimm_bus_descriptor *nd_desc;
> + struct device dev;
> + int id;
> +};
> +#endif /* __ND_PRIVATE_H__ */
At least so far this header doesn't need libnvdimm.h
> +#ifndef __LIBNVDIMM_H__
> +#define __LIBNVDIMM_H__
> +struct nvdimm;
> +struct nvdimm_bus_descriptor;
> +typedef int (*ndctl_fn)(struct nvdimm_bus_descriptor *nd_desc,
> + struct nvdimm *nvdimm, unsigned int cmd, void *buf,
> + unsigned int buf_len);
> +
> +struct nvdimm_bus_descriptor {
> + unsigned long dsm_mask;
> + char *provider_name;
> + ndctl_fn ndctl;
> +};
Please provide proper methods that do one thing properly instead of
ioctl-like multiplexers.
^ permalink raw reply [flat|nested] 47+ messages in thread
* Re: [PATCH v5 02/21] libnvdimm, nfit: initial libnvdimm infrastructure and NFIT support
2015-06-03 14:57 ` Christoph Hellwig
@ 2015-06-03 19:24 ` Williams, Dan J
2015-06-09 6:33 ` hch
0 siblings, 1 reply; 47+ messages in thread
From: Williams, Dan J @ 2015-06-03 19:24 UTC (permalink / raw)
To: hch
Cc: linux-kernel, mingo, neilb, jmoyer, linux-api, axboe, akpm, sfr,
linux-nvdimm@lists.01.org, gregkh, rafael, linux-acpi
[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #1: Type: text/plain; charset="utf-8", Size: 31591 bytes --]
On Wed, 2015-06-03 at 16:57 +0200, Christoph Hellwig wrote:
> On Mon, Jun 01, 2015 at 08:14:19PM -0400, Dan Williams wrote:
> > A libnvdimm bus is the anchor device for registering nvdimm resources and
> > interfaces, for example, a character control device, nvdimm devices,
> > and I/O region devices. The ACPI NFIT (NVDIMM Firmware Interface Table)
> > is one possible platform description for such non-volatile memory
> > resources in a system. The nfit.ko driver attaches to the "ACPI0012"
> > device that indicates the presence of the NFIT and parses the table to
> > register a libnvdimm bus instance.
>
> Havin lib in a name of a bus seems odd. Why not simply the nvdimm bus?
Sorry, that is a typo the bus is indeed an struct nvdimm_bus instance.
> Also this seems to both have the generic nvdimm infrastructure as well
> as the acpi wiring. Might make sense to split this into two patches?
I like to show an initial infrastructure consumer with the initial
implementation in one patch. Makes it easier to catch premature
implementation of features.
>
> > +config ACPI_NFIT
> > + tristate "ACPI NVDIMM Firmware Interface Table (NFIT)"
> > + depends on PHYS_ADDR_T_64BIT
> > + depends on BLK_DEV
> > + select NVDIMM_DEVICES
> > + select LIBNVDIMM
>
> Is this the right way for the user to chose it? It seems like enabling
> the NVMDIMM subsystem would be the obvious choice, and ACPI would
> simply enable the table parsing in that case.
The NVDIMM sub-system is enabled by an external provider. We have the
e820 type-12 provider and the NFIT provider that select LIBNVDIMM.
> > +static u8 nfit_uuid[NFIT_UUID_MAX][16];
>
> Should this use the uuid_le type?
>
That would depend on Rafael being open to changing the
acpi_str_to_uuid() prototype to take an uuid_le.
> > +static const char *spa_type_name(u16 type)
> > +{
> > + switch (type) {
> > + case NFIT_SPA_VOLATILE: return "volatile";
> > + case NFIT_SPA_PM: return "pmem";
> > + case NFIT_SPA_DCR: return "dimm-control-region";
> > + case NFIT_SPA_BDW: return "block-data-window";
> > + default: return "unknown";
>
> Please never put code on the same line as a switch (or goto) label.
Ok, fixed.
>
> > +static void *add_table(struct acpi_nfit_desc *acpi_desc, void *table, const void *end)
> > +{
> > + struct device *dev = acpi_desc->dev;
> > + struct acpi_nfit_header *hdr;
> > + void *err = ERR_PTR(-ENOMEM);
> > +
> > + if (table >= end)
> > + return NULL;
> > +
> > + hdr = (struct acpi_nfit_header *) table;
>
> No need to case from void * to another pointer type.
Whoops, fixed.
>
> > + switch (hdr->type) {
> > + case ACPI_NFIT_TYPE_SYSTEM_ADDRESS: {
> > + struct nfit_spa *nfit_spa = devm_kzalloc(dev, sizeof(*nfit_spa),
> > + GFP_KERNEL);
> > + struct acpi_nfit_system_address *spa = table;
> > +
> > + if (!nfit_spa)
> > + return err;
> > + INIT_LIST_HEAD(&nfit_spa->list);
> > + nfit_spa->spa = spa;
> > + list_add_tail(&nfit_spa->list, &acpi_desc->spas);
> > + dev_dbg(dev, "%s: spa index: %d type: %s\n", __func__,
> > + spa->range_index,
> > + spa_type_name(nfit_spa_type(spa)));
>
> If you need local variables inside a switch statement you probably
> want to split each case into a separate helper function.
Yeah, probably better that way. Done.
>
> > +static inline struct acpi_nfit_memory_map *__to_nfit_memdev(struct nfit_mem *nfit_mem)
>
> This line is over 80 characters.
I generally don't see the point of fixing up occasional small incursions
over 80 characters if it makes the code more amenable to grep.
> Also why the odd __-prefix?
Later on the series there's a to_nfit_memdev() that takes a struct
device *, and this one is an internal helper.
>
> > new file mode 100644
> > index 000000000000..24b51dbc8215
> > --- /dev/null
> > +++ b/drivers/nvdimm/Kconfig
> > @@ -0,0 +1,20 @@
> > +menuconfig NVDIMM_DEVICES
> > + bool "NVDIMM (Non-Volatile Memory Device) Support"
> > + help
> > + Generic support for non-volatile memory devices including
> > + ACPI-6-NFIT defined resources. On platforms that define an
> > + NFIT, or otherwise can discover NVDIMM resources, a libnvdimm
> > + bus is registered to advertise PMEM (persistent memory)
> > + namespaces (/dev/pmemX) and BLK (sliding mmio window(s))
> > + namespaces (/dev/ndX). A PMEM namespace refers to a memory
> > + resource that may span multiple DIMMs and support DAX (see
> > + CONFIG_DAX). A BLK namespace refers to an NVDIMM control
> > + region which exposes an mmio register set for windowed
> > + access mode to non-volatile memory.
> > +
> > +if NVDIMM_DEVICES
> > +
> > +config LIBNVDIMM
> > + tristate
> > +
> > +endif
>
> What different meanings will CONFIG_NVDIMM_DEVICES and CONFIG_LIBNVDIMM
> have?
Hmm, nothing worthwhile. I'll merge them into one menuconfig
CONFIG_LIBNVDIMM tristate.
>
> > diff --git a/drivers/nvdimm/nd-private.h b/drivers/nvdimm/nd-private.h
> > new file mode 100644
> > index 000000000000..e7c4e99a22a4
> > --- /dev/null
> > +++ b/drivers/nvdimm/nd-private.h
>
> No need for -private if you're already under drivers/nvdimm..
This is the private private-header in the sense that it defines
infrastructure that is only meant for the core. Drivers (btt, pmem,
blk, etc) must not include nd-private.h. I'll rename it "nd-core.h" to
make this more clear.
> > +#ifndef __ND_PRIVATE_H__
> > +#define __ND_PRIVATE_H__
> > +#include <linux/libnvdimm.h>
> > +#include <linux/device.h>
> > +
> > +struct nvdimm_bus {
> > + struct nvdimm_bus_descriptor *nd_desc;
> > + struct device dev;
> > + int id;
> > +};
> > +#endif /* __ND_PRIVATE_H__ */
>
> At least so far this header doesn't need libnvdimm.h
struct nvdimm_bus_descriptor is defined there and a forward declaration
does not make sense since we'll need the rest of the header later in the
series.
>
> > +#ifndef __LIBNVDIMM_H__
> > +#define __LIBNVDIMM_H__
> > +struct nvdimm;
> > +struct nvdimm_bus_descriptor;
> > +typedef int (*ndctl_fn)(struct nvdimm_bus_descriptor *nd_desc,
> > + struct nvdimm *nvdimm, unsigned int cmd, void *buf,
> > + unsigned int buf_len);
> > +
> > +struct nvdimm_bus_descriptor {
> > + unsigned long dsm_mask;
> > + char *provider_name;
> > + ndctl_fn ndctl;
> > +};
>
> Please provide proper methods that do one thing properly instead of
> ioctl-like multiplexers.
This *is* the ioctl multiplexer. The generic ioctl implementation in
libnvdimm uses the ndctl_fn to call back out to the provider to process
the command. In the case of ACPI this maps to a _DSM (device specific
method), for nfit_test it's a emulated implementation, and for
e820-type-12 this is obviously not implemented.
Reflowed patch with these fixes follows...
8<-----
Subject: libnvdimm, nfit: initial libnvdimm infrastructure and NFIT support
From: Dan Williams <dan.j.williams@intel.com>
A libnvdimm bus is the anchor device for registering nvdimm resources and
interfaces, for example, a character control device, nvdimm devices,
and I/O region devices. The ACPI NFIT (NVDIMM Firmware Interface Table)
is one possible platform description for such non-volatile memory
resources in a system. The nfit.ko driver attaches to the "ACPI0012"
device that indicates the presence of the NFIT and parses the table to
register a struct nvdimm_bus instance.
Cc: <linux-acpi@vger.kernel.org>
Cc: Lv Zheng <lv.zheng@intel.com>
Cc: Robert Moore <robert.moore@intel.com>
Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
drivers/Kconfig | 2
drivers/Makefile | 1
drivers/acpi/Kconfig | 14 +
drivers/acpi/Makefile | 1
drivers/acpi/nfit.c | 481 +++++++++++++++++++++++++++++++++++++++++++++
drivers/acpi/nfit.h | 89 ++++++++
drivers/nvdimm/Kconfig | 13 +
drivers/nvdimm/Makefile | 3
drivers/nvdimm/core.c | 67 ++++++
drivers/nvdimm/nd-core.h | 23 ++
include/linux/libnvdimm.h | 34 +++
11 files changed, 728 insertions(+)
create mode 100644 drivers/acpi/nfit.c
create mode 100644 drivers/acpi/nfit.h
create mode 100644 drivers/nvdimm/Kconfig
create mode 100644 drivers/nvdimm/Makefile
create mode 100644 drivers/nvdimm/core.c
create mode 100644 drivers/nvdimm/nd-core.h
create mode 100644 include/linux/libnvdimm.h
diff --git a/drivers/Kconfig b/drivers/Kconfig
index c0cc96bab9e7..6e973b8e3a3b 100644
--- a/drivers/Kconfig
+++ b/drivers/Kconfig
@@ -182,4 +182,6 @@ source "drivers/thunderbolt/Kconfig"
source "drivers/android/Kconfig"
+source "drivers/nvdimm/Kconfig"
+
endmenu
diff --git a/drivers/Makefile b/drivers/Makefile
index 46d2554be404..692adf659028 100644
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -64,6 +64,7 @@ obj-$(CONFIG_FB_INTEL) += video/fbdev/intelfb/
obj-$(CONFIG_PARPORT) += parport/
obj-y += base/ block/ misc/ mfd/ nfc/
+obj-$(CONFIG_LIBNVDIMM) += nvdimm/
obj-$(CONFIG_DMA_SHARED_BUFFER) += dma-buf/
obj-$(CONFIG_NUBUS) += nubus/
obj-y += macintosh/
diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index ab2cbb51c6aa..300b4ef3712b 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -383,6 +383,20 @@ config ACPI_REDUCED_HARDWARE_ONLY
If you are unsure what to do, do not enable this option.
+config ACPI_NFIT
+ tristate "ACPI NVDIMM Firmware Interface Table (NFIT)"
+ depends on PHYS_ADDR_T_64BIT
+ depends on BLK_DEV
+ select LIBNVDIMM
+ help
+ Infrastructure to probe ACPI 6 compliant platforms for
+ NVDIMMs (NFIT) and register a libnvdimm device tree. In
+ addition to storage devices this also enables libnvdimm to pass
+ ACPI._DSM messages for platform/dimm configuration.
+
+ To compile this driver as a module, choose M here:
+ the module will be called nfit.
+
source "drivers/acpi/apei/Kconfig"
config ACPI_EXTLOG
diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
index 8a063e276530..f7e9c92ccdcb 100644
--- a/drivers/acpi/Makefile
+++ b/drivers/acpi/Makefile
@@ -71,6 +71,7 @@ obj-$(CONFIG_ACPI_PCI_SLOT) += pci_slot.o
obj-$(CONFIG_ACPI_PROCESSOR) += processor.o
obj-y += container.o
obj-$(CONFIG_ACPI_THERMAL) += thermal.o
+obj-$(CONFIG_ACPI_NFIT) += nfit.o
obj-y += acpi_memhotplug.o
obj-$(CONFIG_ACPI_HOTPLUG_IOAPIC) += ioapic.o
obj-$(CONFIG_ACPI_BATTERY) += battery.o
diff --git a/drivers/acpi/nfit.c b/drivers/acpi/nfit.c
new file mode 100644
index 000000000000..c400d60018a5
--- /dev/null
+++ b/drivers/acpi/nfit.c
@@ -0,0 +1,481 @@
+/*
+ * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ */
+#include <linux/list_sort.h>
+#include <linux/libnvdimm.h>
+#include <linux/module.h>
+#include <linux/list.h>
+#include <linux/acpi.h>
+#include "nfit.h"
+
+static u8 nfit_uuid[NFIT_UUID_MAX][16];
+
+static const u8 *to_nfit_uuid(enum nfit_uuids id)
+{
+ return nfit_uuid[id];
+}
+
+static int acpi_nfit_ctl(struct nvdimm_bus_descriptor *nd_desc,
+ struct nvdimm *nvdimm, unsigned int cmd, void *buf,
+ unsigned int buf_len)
+{
+ return -ENOTTY;
+}
+
+static const char *spa_type_name(u16 type)
+{
+ static const char *to_name[] = {
+ [NFIT_SPA_VOLATILE] = "volatile",
+ [NFIT_SPA_PM] = "pmem",
+ [NFIT_SPA_DCR] = "dimm-control-region",
+ [NFIT_SPA_BDW] = "block-data-window",
+ [NFIT_SPA_VDISK] = "volatile-disk",
+ [NFIT_SPA_VCD] = "volatile-cd",
+ [NFIT_SPA_PDISK] = "persistent-disk",
+ [NFIT_SPA_PCD] = "persistent-cd",
+
+ };
+
+ if (type > NFIT_SPA_PCD)
+ return "unknown";
+
+ return to_name[type];
+}
+
+static int nfit_spa_type(struct acpi_nfit_system_address *spa)
+{
+ int i;
+
+ for (i = 0; i < NFIT_UUID_MAX; i++)
+ if (memcmp(to_nfit_uuid(i), spa->range_guid, 16) == 0)
+ return i;
+ return -1;
+}
+
+static bool add_spa(struct acpi_nfit_desc *acpi_desc,
+ struct acpi_nfit_system_address *spa)
+{
+ struct device *dev = acpi_desc->dev;
+ struct nfit_spa *nfit_spa = devm_kzalloc(dev, sizeof(*nfit_spa),
+ GFP_KERNEL);
+
+ if (!nfit_spa)
+ return false;
+ INIT_LIST_HEAD(&nfit_spa->list);
+ nfit_spa->spa = spa;
+ list_add_tail(&nfit_spa->list, &acpi_desc->spas);
+ dev_dbg(dev, "%s: spa index: %d type: %s\n", __func__,
+ spa->range_index,
+ spa_type_name(nfit_spa_type(spa)));
+ return true;
+}
+
+static bool add_memdev(struct acpi_nfit_desc *acpi_desc,
+ struct acpi_nfit_memory_map *memdev)
+{
+ struct device *dev = acpi_desc->dev;
+ struct nfit_memdev *nfit_memdev = devm_kzalloc(dev,
+ sizeof(*nfit_memdev), GFP_KERNEL);
+
+ if (!nfit_memdev)
+ return false;
+ INIT_LIST_HEAD(&nfit_memdev->list);
+ nfit_memdev->memdev = memdev;
+ list_add_tail(&nfit_memdev->list, &acpi_desc->memdevs);
+ dev_dbg(dev, "%s: memdev handle: %#x spa: %d dcr: %d\n",
+ __func__, memdev->device_handle, memdev->range_index,
+ memdev->region_index);
+ return true;
+}
+
+static bool add_dcr(struct acpi_nfit_desc *acpi_desc,
+ struct acpi_nfit_control_region *dcr)
+{
+ struct device *dev = acpi_desc->dev;
+ struct nfit_dcr *nfit_dcr = devm_kzalloc(dev, sizeof(*nfit_dcr),
+ GFP_KERNEL);
+
+ if (!nfit_dcr)
+ return false;
+ INIT_LIST_HEAD(&nfit_dcr->list);
+ nfit_dcr->dcr = dcr;
+ list_add_tail(&nfit_dcr->list, &acpi_desc->dcrs);
+ dev_dbg(dev, "%s: dcr index: %d windows: %d\n", __func__,
+ dcr->region_index, dcr->windows);
+ return true;
+}
+
+static bool add_bdw(struct acpi_nfit_desc *acpi_desc,
+ struct acpi_nfit_data_region *bdw)
+{
+ struct device *dev = acpi_desc->dev;
+ struct nfit_bdw *nfit_bdw = devm_kzalloc(dev, sizeof(*nfit_bdw),
+ GFP_KERNEL);
+
+ if (!nfit_bdw)
+ return false;
+ INIT_LIST_HEAD(&nfit_bdw->list);
+ nfit_bdw->bdw = bdw;
+ list_add_tail(&nfit_bdw->list, &acpi_desc->bdws);
+ dev_dbg(dev, "%s: bdw dcr: %d windows: %d\n", __func__,
+ bdw->region_index, bdw->windows);
+ return true;
+}
+
+static void *add_table(struct acpi_nfit_desc *acpi_desc, void *table, const void *end)
+{
+ struct device *dev = acpi_desc->dev;
+ struct acpi_nfit_header *hdr;
+ void *err = ERR_PTR(-ENOMEM);
+
+ if (table >= end)
+ return NULL;
+
+ hdr = table;
+ switch (hdr->type) {
+ case ACPI_NFIT_TYPE_SYSTEM_ADDRESS:
+ if (!add_spa(acpi_desc, table))
+ return err;
+ break;
+ case ACPI_NFIT_TYPE_MEMORY_MAP:
+ if (!add_memdev(acpi_desc, table))
+ return err;
+ break;
+ case ACPI_NFIT_TYPE_CONTROL_REGION:
+ if (!add_dcr(acpi_desc, table))
+ return err;
+ break;
+ case ACPI_NFIT_TYPE_DATA_REGION:
+ if (!add_bdw(acpi_desc, table))
+ return err;
+ break;
+ /* TODO */
+ case ACPI_NFIT_TYPE_INTERLEAVE:
+ dev_dbg(dev, "%s: idt\n", __func__);
+ break;
+ case ACPI_NFIT_TYPE_FLUSH_ADDRESS:
+ dev_dbg(dev, "%s: flush\n", __func__);
+ break;
+ case ACPI_NFIT_TYPE_SMBIOS:
+ dev_dbg(dev, "%s: smbios\n", __func__);
+ break;
+ default:
+ dev_err(dev, "unknown table '%d' parsing nfit\n", hdr->type);
+ break;
+ }
+
+ return table + hdr->length;
+}
+
+static void nfit_mem_find_spa_bdw(struct acpi_nfit_desc *acpi_desc,
+ struct nfit_mem *nfit_mem)
+{
+ u32 device_handle = __to_nfit_memdev(nfit_mem)->device_handle;
+ u16 dcr_index = nfit_mem->dcr->region_index;
+ struct nfit_spa *nfit_spa;
+
+ list_for_each_entry(nfit_spa, &acpi_desc->spas, list) {
+ u16 range_index = nfit_spa->spa->range_index;
+ int type = nfit_spa_type(nfit_spa->spa);
+ struct nfit_memdev *nfit_memdev;
+
+ if (type != NFIT_SPA_BDW)
+ continue;
+
+ list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) {
+ if (nfit_memdev->memdev->range_index != range_index)
+ continue;
+ if (nfit_memdev->memdev->device_handle != device_handle)
+ continue;
+ if (nfit_memdev->memdev->region_index != dcr_index)
+ continue;
+
+ nfit_mem->spa_bdw = nfit_spa->spa;
+ return;
+ }
+ }
+
+ dev_dbg(acpi_desc->dev, "SPA-BDW not found for SPA-DCR %d\n",
+ nfit_mem->spa_dcr->range_index);
+ nfit_mem->bdw = NULL;
+}
+
+static int nfit_mem_add(struct acpi_nfit_desc *acpi_desc,
+ struct nfit_mem *nfit_mem, struct acpi_nfit_system_address *spa)
+{
+ u16 dcr_index = __to_nfit_memdev(nfit_mem)->region_index;
+ struct nfit_dcr *nfit_dcr;
+ struct nfit_bdw *nfit_bdw;
+
+ list_for_each_entry(nfit_dcr, &acpi_desc->dcrs, list) {
+ if (nfit_dcr->dcr->region_index != dcr_index)
+ continue;
+ nfit_mem->dcr = nfit_dcr->dcr;
+ break;
+ }
+
+ if (!nfit_mem->dcr) {
+ dev_dbg(acpi_desc->dev, "SPA %d missing:%s%s\n", spa->range_index,
+ __to_nfit_memdev(nfit_mem) ? "" : " MEMDEV",
+ nfit_mem->dcr ? "" : " DCR");
+ return -ENODEV;
+ }
+
+ /*
+ * We've found enough to create an nvdimm, optionally
+ * find an associated BDW
+ */
+ list_add(&nfit_mem->list, &acpi_desc->dimms);
+
+ list_for_each_entry(nfit_bdw, &acpi_desc->bdws, list) {
+ if (nfit_bdw->bdw->region_index != dcr_index)
+ continue;
+ nfit_mem->bdw = nfit_bdw->bdw;
+ break;
+ }
+
+ if (!nfit_mem->bdw)
+ return 0;
+
+ nfit_mem_find_spa_bdw(acpi_desc, nfit_mem);
+ return 0;
+}
+
+static int nfit_mem_dcr_init(struct acpi_nfit_desc *acpi_desc,
+ struct acpi_nfit_system_address *spa)
+{
+ struct nfit_mem *nfit_mem, *found;
+ struct nfit_memdev *nfit_memdev;
+ int type = nfit_spa_type(spa);
+ u16 dcr_index;
+
+ switch (type) {
+ case NFIT_SPA_DCR:
+ case NFIT_SPA_PM:
+ break;
+ default:
+ return 0;
+ }
+
+ list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) {
+ int rc;
+
+ if (nfit_memdev->memdev->range_index != spa->range_index)
+ continue;
+ found = NULL;
+ dcr_index = nfit_memdev->memdev->region_index;
+ list_for_each_entry(nfit_mem, &acpi_desc->dimms, list)
+ if (__to_nfit_memdev(nfit_mem)->region_index == dcr_index) {
+ found = nfit_mem;
+ break;
+ }
+
+ if (found)
+ nfit_mem = found;
+ else {
+ nfit_mem = devm_kzalloc(acpi_desc->dev,
+ sizeof(*nfit_mem), GFP_KERNEL);
+ if (!nfit_mem)
+ return -ENOMEM;
+ INIT_LIST_HEAD(&nfit_mem->list);
+ }
+
+ if (type == NFIT_SPA_DCR) {
+ /* multiple dimms may share a SPA when interleaved */
+ nfit_mem->spa_dcr = spa;
+ nfit_mem->memdev_dcr = nfit_memdev->memdev;
+ } else {
+ /*
+ * A single dimm may belong to multiple SPA-PM
+ * ranges, record at least one in addition to
+ * any SPA-DCR range.
+ */
+ nfit_mem->memdev_pmem = nfit_memdev->memdev;
+ }
+
+ if (found)
+ continue;
+
+ rc = nfit_mem_add(acpi_desc, nfit_mem, spa);
+ if (rc)
+ return rc;
+ }
+
+ return 0;
+}
+
+static int nfit_mem_cmp(void *priv, struct list_head *__a, struct list_head *__b)
+{
+ struct nfit_mem *a = container_of(__a, typeof(*a), list);
+ struct nfit_mem *b = container_of(__b, typeof(*b), list);
+ u32 handleA, handleB;
+
+ handleA = __to_nfit_memdev(a)->device_handle;
+ handleB = __to_nfit_memdev(b)->device_handle;
+ if (handleA < handleB)
+ return -1;
+ else if (handleA > handleB)
+ return 1;
+ return 0;
+}
+
+static int nfit_mem_init(struct acpi_nfit_desc *acpi_desc)
+{
+ struct nfit_spa *nfit_spa;
+
+ /*
+ * For each SPA-DCR or SPA-PMEM address range find its
+ * corresponding MEMDEV(s). From each MEMDEV find the
+ * corresponding DCR. Then, if we're operating on a SPA-DCR,
+ * try to find a SPA-BDW and a corresponding BDW that references
+ * the DCR. Throw it all into an nfit_mem object. Note, that
+ * BDWs are optional.
+ */
+ list_for_each_entry(nfit_spa, &acpi_desc->spas, list) {
+ int rc;
+
+ rc = nfit_mem_dcr_init(acpi_desc, nfit_spa->spa);
+ if (rc)
+ return rc;
+ }
+
+ list_sort(NULL, &acpi_desc->dimms, nfit_mem_cmp);
+
+ return 0;
+}
+
+static int acpi_nfit_init(struct acpi_nfit_desc *acpi_desc, acpi_size sz)
+{
+ struct device *dev = acpi_desc->dev;
+ const void *end;
+ u8 *data;
+
+ INIT_LIST_HEAD(&acpi_desc->spas);
+ INIT_LIST_HEAD(&acpi_desc->dcrs);
+ INIT_LIST_HEAD(&acpi_desc->bdws);
+ INIT_LIST_HEAD(&acpi_desc->memdevs);
+ INIT_LIST_HEAD(&acpi_desc->dimms);
+
+ data = (u8 *) acpi_desc->nfit;
+ end = data + sz;
+ data += sizeof(struct acpi_table_nfit);
+ while (!IS_ERR_OR_NULL(data))
+ data = add_table(acpi_desc, data, end);
+
+ if (IS_ERR(data)) {
+ dev_dbg(dev, "%s: nfit table parsing error: %ld\n", __func__,
+ PTR_ERR(data));
+ return PTR_ERR(data);
+ }
+
+ if (nfit_mem_init(acpi_desc) != 0)
+ return -ENOMEM;
+
+ return 0;
+}
+
+static int acpi_nfit_add(struct acpi_device *adev)
+{
+ struct nvdimm_bus_descriptor *nd_desc;
+ struct acpi_nfit_desc *acpi_desc;
+ struct device *dev = &adev->dev;
+ struct acpi_table_header *tbl;
+ acpi_status status = AE_OK;
+ acpi_size sz;
+ int rc;
+
+ status = acpi_get_table_with_size("NFIT", 0, &tbl, &sz);
+ if (ACPI_FAILURE(status)) {
+ dev_err(dev, "failed to find NFIT\n");
+ return -ENXIO;
+ }
+
+ acpi_desc = devm_kzalloc(dev, sizeof(*acpi_desc), GFP_KERNEL);
+ if (!acpi_desc)
+ return -ENOMEM;
+
+ dev_set_drvdata(dev, acpi_desc);
+ acpi_desc->dev = dev;
+ acpi_desc->nfit = (struct acpi_table_nfit *) tbl;
+ nd_desc = &acpi_desc->nd_desc;
+ nd_desc->provider_name = "ACPI.NFIT";
+ nd_desc->ndctl = acpi_nfit_ctl;
+
+ acpi_desc->nvdimm_bus = nvdimm_bus_register(dev, nd_desc);
+ if (!acpi_desc->nvdimm_bus)
+ return -ENXIO;
+
+ rc = acpi_nfit_init(acpi_desc, sz);
+ if (rc) {
+ nvdimm_bus_unregister(acpi_desc->nvdimm_bus);
+ return rc;
+ }
+ return 0;
+}
+
+static int acpi_nfit_remove(struct acpi_device *adev)
+{
+ struct acpi_nfit_desc *acpi_desc = dev_get_drvdata(&adev->dev);
+
+ nvdimm_bus_unregister(acpi_desc->nvdimm_bus);
+ return 0;
+}
+
+static const struct acpi_device_id acpi_nfit_ids[] = {
+ { "ACPI0012", 0 },
+ { "", 0 },
+};
+MODULE_DEVICE_TABLE(acpi, acpi_nfit_ids);
+
+static struct acpi_driver acpi_nfit_driver = {
+ .name = KBUILD_MODNAME,
+ .ids = acpi_nfit_ids,
+ .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
+ .ops = {
+ .add = acpi_nfit_add,
+ .remove = acpi_nfit_remove,
+ },
+};
+
+static __init int nfit_init(void)
+{
+ BUILD_BUG_ON(sizeof(struct acpi_table_nfit) != 40);
+ BUILD_BUG_ON(sizeof(struct acpi_nfit_system_address) != 56);
+ BUILD_BUG_ON(sizeof(struct acpi_nfit_memory_map) != 48);
+ BUILD_BUG_ON(sizeof(struct acpi_nfit_interleave) != 20);
+ BUILD_BUG_ON(sizeof(struct acpi_nfit_smbios) != 9);
+ BUILD_BUG_ON(sizeof(struct acpi_nfit_control_region) != 80);
+ BUILD_BUG_ON(sizeof(struct acpi_nfit_data_region) != 40);
+
+ acpi_str_to_uuid(UUID_VOLATILE_MEMORY, nfit_uuid[NFIT_SPA_VOLATILE]);
+ acpi_str_to_uuid(UUID_PERSISTENT_MEMORY, nfit_uuid[NFIT_SPA_PM]);
+ acpi_str_to_uuid(UUID_CONTROL_REGION, nfit_uuid[NFIT_SPA_DCR]);
+ acpi_str_to_uuid(UUID_DATA_REGION, nfit_uuid[NFIT_SPA_BDW]);
+ acpi_str_to_uuid(UUID_VOLATILE_VIRTUAL_DISK, nfit_uuid[NFIT_SPA_VDISK]);
+ acpi_str_to_uuid(UUID_VOLATILE_VIRTUAL_CD, nfit_uuid[NFIT_SPA_VCD]);
+ acpi_str_to_uuid(UUID_PERSISTENT_VIRTUAL_DISK, nfit_uuid[NFIT_SPA_PDISK]);
+ acpi_str_to_uuid(UUID_PERSISTENT_VIRTUAL_CD, nfit_uuid[NFIT_SPA_PCD]);
+ acpi_str_to_uuid(UUID_NFIT_BUS, nfit_uuid[NFIT_DEV_BUS]);
+ acpi_str_to_uuid(UUID_NFIT_DIMM, nfit_uuid[NFIT_DEV_DIMM]);
+
+ return acpi_bus_register_driver(&acpi_nfit_driver);
+}
+
+static __exit void nfit_exit(void)
+{
+ acpi_bus_unregister_driver(&acpi_nfit_driver);
+}
+
+module_init(nfit_init);
+module_exit(nfit_exit);
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Intel Corporation");
diff --git a/drivers/acpi/nfit.h b/drivers/acpi/nfit.h
new file mode 100644
index 000000000000..2d98cc1b7b6c
--- /dev/null
+++ b/drivers/acpi/nfit.h
@@ -0,0 +1,89 @@
+/*
+ * NVDIMM Firmware Interface Table - NFIT
+ *
+ * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ */
+#ifndef __NFIT_H__
+#define __NFIT_H__
+#include <linux/libnvdimm.h>
+#include <linux/types.h>
+#include <linux/uuid.h>
+#include <linux/acpi.h>
+#include <acpi/acuuid.h>
+
+#define UUID_NFIT_BUS "2f10e7a4-9e91-11e4-89d3-123b93f75cba"
+#define UUID_NFIT_DIMM "4309ac30-0d11-11e4-9191-0800200c9a66"
+
+enum nfit_uuids {
+ NFIT_SPA_VOLATILE,
+ NFIT_SPA_PM,
+ NFIT_SPA_DCR,
+ NFIT_SPA_BDW,
+ NFIT_SPA_VDISK,
+ NFIT_SPA_VCD,
+ NFIT_SPA_PDISK,
+ NFIT_SPA_PCD,
+ NFIT_DEV_BUS,
+ NFIT_DEV_DIMM,
+ NFIT_UUID_MAX,
+};
+
+struct nfit_spa {
+ struct acpi_nfit_system_address *spa;
+ struct list_head list;
+};
+
+struct nfit_dcr {
+ struct acpi_nfit_control_region *dcr;
+ struct list_head list;
+};
+
+struct nfit_bdw {
+ struct acpi_nfit_data_region *bdw;
+ struct list_head list;
+};
+
+struct nfit_memdev {
+ struct acpi_nfit_memory_map *memdev;
+ struct list_head list;
+};
+
+/* assembled tables for a given dimm/memory-device */
+struct nfit_mem {
+ struct acpi_nfit_memory_map *memdev_dcr;
+ struct acpi_nfit_memory_map *memdev_pmem;
+ struct acpi_nfit_control_region *dcr;
+ struct acpi_nfit_data_region *bdw;
+ struct acpi_nfit_system_address *spa_dcr;
+ struct acpi_nfit_system_address *spa_bdw;
+ struct list_head list;
+};
+
+struct acpi_nfit_desc {
+ struct nvdimm_bus_descriptor nd_desc;
+ struct acpi_table_nfit *nfit;
+ struct list_head memdevs;
+ struct list_head dimms;
+ struct list_head spas;
+ struct list_head dcrs;
+ struct list_head bdws;
+ struct nvdimm_bus *nvdimm_bus;
+ struct device *dev;
+};
+
+static inline struct acpi_nfit_memory_map *__to_nfit_memdev(struct nfit_mem *nfit_mem)
+{
+ if (nfit_mem->memdev_dcr)
+ return nfit_mem->memdev_dcr;
+ return nfit_mem->memdev_pmem;
+}
+#endif /* __NFIT_H__ */
diff --git a/drivers/nvdimm/Kconfig b/drivers/nvdimm/Kconfig
new file mode 100644
index 000000000000..4f2291938ea0
--- /dev/null
+++ b/drivers/nvdimm/Kconfig
@@ -0,0 +1,13 @@
+config LIBNVDIMM
+ tristate "NVDIMM (Non-Volatile Memory Device) Support"
+ help
+ Generic support for non-volatile memory devices including
+ ACPI-6-NFIT defined resources. On platforms that define an
+ NFIT, or otherwise can discover NVDIMM resources, a libnvdimm
+ bus is registered to advertise PMEM (persistent memory)
+ namespaces (/dev/pmemX) and BLK (sliding mmio window(s))
+ namespaces (/dev/ndX). A PMEM namespace refers to a memory
+ resource that may span multiple DIMMs and support DAX (see
+ CONFIG_DAX). A BLK namespace refers to an NVDIMM control
+ region which exposes an mmio register set for windowed
+ access mode to non-volatile memory.
diff --git a/drivers/nvdimm/Makefile b/drivers/nvdimm/Makefile
new file mode 100644
index 000000000000..10bc7af47992
--- /dev/null
+++ b/drivers/nvdimm/Makefile
@@ -0,0 +1,3 @@
+obj-$(CONFIG_LIBNVDIMM) += libnvdimm.o
+
+libnvdimm-y := core.o
diff --git a/drivers/nvdimm/core.c b/drivers/nvdimm/core.c
new file mode 100644
index 000000000000..5ccd500ffd4f
--- /dev/null
+++ b/drivers/nvdimm/core.c
@@ -0,0 +1,67 @@
+/*
+ * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ */
+#include <linux/libnvdimm.h>
+#include <linux/export.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/slab.h>
+#include "nd-core.h"
+
+static DEFINE_IDA(nd_ida);
+
+static void nvdimm_bus_release(struct device *dev)
+{
+ struct nvdimm_bus *nvdimm_bus = container_of(dev, struct nvdimm_bus, dev);
+
+ ida_simple_remove(&nd_ida, nvdimm_bus->id);
+ kfree(nvdimm_bus);
+}
+
+struct nvdimm_bus *nvdimm_bus_register(struct device *parent,
+ struct nvdimm_bus_descriptor *nd_desc)
+{
+ struct nvdimm_bus *nvdimm_bus = kzalloc(sizeof(*nvdimm_bus), GFP_KERNEL);
+ int rc;
+
+ if (!nvdimm_bus)
+ return NULL;
+ nvdimm_bus->id = ida_simple_get(&nd_ida, 0, 0, GFP_KERNEL);
+ if (nvdimm_bus->id < 0) {
+ kfree(nvdimm_bus);
+ return NULL;
+ }
+ nvdimm_bus->nd_desc = nd_desc;
+ nvdimm_bus->dev.parent = parent;
+ nvdimm_bus->dev.release = nvdimm_bus_release;
+ dev_set_name(&nvdimm_bus->dev, "ndbus%d", nvdimm_bus->id);
+ rc = device_register(&nvdimm_bus->dev);
+ if (rc) {
+ dev_dbg(&nvdimm_bus->dev, "device registration failed: %d\n", rc);
+ put_device(&nvdimm_bus->dev);
+ return NULL;
+ }
+
+ return nvdimm_bus;
+}
+EXPORT_SYMBOL_GPL(nvdimm_bus_register);
+
+void nvdimm_bus_unregister(struct nvdimm_bus *nvdimm_bus)
+{
+ if (!nvdimm_bus)
+ return;
+ device_unregister(&nvdimm_bus->dev);
+}
+EXPORT_SYMBOL_GPL(nvdimm_bus_unregister);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Intel Corporation");
diff --git a/drivers/nvdimm/nd-core.h b/drivers/nvdimm/nd-core.h
new file mode 100644
index 000000000000..e7c4e99a22a4
--- /dev/null
+++ b/drivers/nvdimm/nd-core.h
@@ -0,0 +1,23 @@
+/*
+ * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ */
+#ifndef __ND_PRIVATE_H__
+#define __ND_PRIVATE_H__
+#include <linux/libnvdimm.h>
+#include <linux/device.h>
+
+struct nvdimm_bus {
+ struct nvdimm_bus_descriptor *nd_desc;
+ struct device dev;
+ int id;
+};
+#endif /* __ND_PRIVATE_H__ */
diff --git a/include/linux/libnvdimm.h b/include/linux/libnvdimm.h
new file mode 100644
index 000000000000..2b3c63950c91
--- /dev/null
+++ b/include/linux/libnvdimm.h
@@ -0,0 +1,34 @@
+/*
+ * libnvdimm - Non-volatile-memory Devices Subsystem
+ *
+ * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ */
+#ifndef __LIBNVDIMM_H__
+#define __LIBNVDIMM_H__
+struct nvdimm;
+struct nvdimm_bus_descriptor;
+typedef int (*ndctl_fn)(struct nvdimm_bus_descriptor *nd_desc,
+ struct nvdimm *nvdimm, unsigned int cmd, void *buf,
+ unsigned int buf_len);
+
+struct nvdimm_bus_descriptor {
+ unsigned long dsm_mask;
+ char *provider_name;
+ ndctl_fn ndctl;
+};
+
+struct device;
+struct nvdimm_bus;
+struct nvdimm_bus *nvdimm_bus_register(struct device *parent,
+ struct nvdimm_bus_descriptor *nfit_desc);
+void nvdimm_bus_unregister(struct nvdimm_bus *nvdimm_bus);
+#endif /* __LIBNVDIMM_H__ */
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^ permalink raw reply related [flat|nested] 47+ messages in thread
* Re: [PATCH v5 09/21] libnvdimm, nd_pmem: add libnvdimm support to the pmem driver
2015-06-03 7:44 ` Christoph Hellwig
@ 2015-06-03 19:31 ` Williams, Dan J
2015-06-09 6:36 ` hch
0 siblings, 1 reply; 47+ messages in thread
From: Williams, Dan J @ 2015-06-03 19:31 UTC (permalink / raw)
To: hch
Cc: linux-kernel, mingo, linux-nvdimm, neilb, linux-api, hch, axboe,
akpm, sfr, gregkh, rafael, linux-acpi
[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #1: Type: text/plain; charset="utf-8", Size: 21498 bytes --]
On Wed, 2015-06-03 at 00:44 -0700, Christoph Hellwig wrote:
> This patch doesn't apply, as it seems to use some git magic.
>
> But looking at it it's also wrong in that it mixes a file move
> and actual changes to the file.
I like move-modify patches because they make the reason for the move
clearer and revertible. Consider a general case where we later decide
the reason for a move was invalid. Reverting the reason also reverts
the file move, that doesn't automatically happen when it is split to
another commit.
In case you don't want to mess around with 'git apply' here's the
unmagical version of the patch (rebased according to the comments you
made to patch 2)...
8<---
libnvdimm, nd_pmem: add libnvdimm support to the pmem driver
From: Dan Williams <dan.j.williams@intel.com>
nd_pmem attaches to persistent memory regions and namespaces emitted by
the libnvdimm subsystem, and, same as the original pmem driver, presents
the system-physical-address range as a block device.
The existing e820-type-12 to pmem setup is converted to a full libnvdimm
bus that emits an nd_namespace_io device.
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Boaz Harrosh <boaz@plexistor.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Jens Axboe <axboe@fb.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
arch/x86/Kconfig | 3 +
arch/x86/kernel/pmem.c | 92 +++++++++++------
drivers/block/Kconfig | 11 --
drivers/block/Makefile | 1
drivers/block/pmem.c | 262 -----------------------------------------------
drivers/nvdimm/Kconfig | 22 ++++
drivers/nvdimm/Makefile | 3 +
drivers/nvdimm/pmem.c | 260 +++++++++++++++++++++++++++++++++++++++++++++++
8 files changed, 347 insertions(+), 307 deletions(-)
delete mode 100644 drivers/block/pmem.c
create mode 100644 drivers/nvdimm/pmem.c
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 226d5696e1d1..1a2cbf641667 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1424,6 +1424,9 @@ source "mm/Kconfig"
config X86_PMEM_LEGACY
bool "Support non-standard NVDIMMs and ADR protected memory"
+ depends on PHYS_ADDR_T_64BIT
+ depends on BLK_DEV
+ select LIBNVDIMM
help
Treat memory marked using the non-standard e820 type of 12 as used
by the Intel Sandy Bridge-EP reference BIOS as protected memory.
diff --git a/arch/x86/kernel/pmem.c b/arch/x86/kernel/pmem.c
index 3420c874ddc5..40d734c8e3b1 100644
--- a/arch/x86/kernel/pmem.c
+++ b/arch/x86/kernel/pmem.c
@@ -1,53 +1,81 @@
/*
* Copyright (c) 2015, Christoph Hellwig.
+ * Copyright (c) 2015, Intel Corporation.
*/
-#include <linux/memblock.h>
#include <linux/platform_device.h>
-#include <linux/slab.h>
+#include <linux/libnvdimm.h>
+#include <linux/module.h>
#include <asm/e820.h>
-#include <asm/page_types.h>
-#include <asm/setup.h>
-static __init void register_pmem_device(struct resource *res)
+static void e820_pmem_release(struct device *dev)
{
- struct platform_device *pdev;
- int error;
+ struct nvdimm_bus *nvdimm_bus = dev->platform_data;
- pdev = platform_device_alloc("pmem", PLATFORM_DEVID_AUTO);
- if (!pdev)
- return;
+ if (nvdimm_bus)
+ nvdimm_bus_unregister(nvdimm_bus);
+}
- error = platform_device_add_resources(pdev, res, 1);
- if (error)
- goto out_put_pdev;
+static struct platform_device e820_pmem = {
+ .name = "e820_pmem",
+ .id = -1,
+ .dev = {
+ .release = e820_pmem_release,
+ },
+};
- error = platform_device_add(pdev);
- if (error)
- goto out_put_pdev;
- return;
+static const struct attribute_group *e820_pmem_attribute_groups[] = {
+ &nvdimm_bus_attribute_group,
+ NULL,
+};
-out_put_pdev:
- dev_warn(&pdev->dev, "failed to add 'pmem' (persistent memory) device!\n");
- platform_device_put(pdev);
-}
+static const struct attribute_group *e820_pmem_region_attribute_groups[] = {
+ &nd_region_attribute_group,
+ &nd_device_attribute_group,
+ NULL,
+};
-static __init int register_pmem_devices(void)
+static __init int register_e820_pmem(void)
{
- int i;
+ static struct nvdimm_bus_descriptor nd_desc;
+ struct device *dev = &e820_pmem.dev;
+ struct nvdimm_bus *nvdimm_bus;
+ int rc, i;
+
+ rc = platform_device_register(&e820_pmem);
+ if (rc)
+ return rc;
+
+ nd_desc.attr_groups = e820_pmem_attribute_groups;
+ nd_desc.provider_name = "e820";
+ nvdimm_bus = nvdimm_bus_register(dev, &nd_desc);
+ if (!nvdimm_bus)
+ goto err;
+ dev->platform_data = nvdimm_bus;
for (i = 0; i < e820.nr_map; i++) {
struct e820entry *ei = &e820.map[i];
+ struct resource res = {
+ .flags = IORESOURCE_MEM,
+ .start = ei->addr,
+ .end = ei->addr + ei->size - 1,
+ };
+ struct nd_region_desc ndr_desc;
+
+ if (ei->type != E820_PRAM)
+ continue;
- if (ei->type == E820_PRAM) {
- struct resource res = {
- .flags = IORESOURCE_MEM,
- .start = ei->addr,
- .end = ei->addr + ei->size - 1,
- };
- register_pmem_device(&res);
- }
+ memset(&ndr_desc, 0, sizeof(ndr_desc));
+ ndr_desc.res = &res;
+ ndr_desc.attr_groups = e820_pmem_region_attribute_groups;
+ if (!nvdimm_pmem_region_create(nvdimm_bus, &ndr_desc))
+ goto err;
}
return 0;
+
+ err:
+ dev_err(dev, "failed to register legacy persistent memory ranges\n");
+ platform_device_unregister(&e820_pmem);
+ return -ENXIO;
}
-device_initcall(register_pmem_devices);
+late_initcall(register_e820_pmem);
diff --git a/drivers/block/Kconfig b/drivers/block/Kconfig
index eb1fed5bd516..1b8094d4d7af 100644
--- a/drivers/block/Kconfig
+++ b/drivers/block/Kconfig
@@ -404,17 +404,6 @@ config BLK_DEV_RAM_DAX
and will prevent RAM block device backing store memory from being
allocated from highmem (only a problem for highmem systems).
-config BLK_DEV_PMEM
- tristate "Persistent memory block device support"
- help
- Saying Y here will allow you to use a contiguous range of reserved
- memory as one or more persistent block devices.
-
- To compile this driver as a module, choose M here: the module will be
- called 'pmem'.
-
- If unsure, say N.
-
config CDROM_PKTCDVD
tristate "Packet writing on CD/DVD media"
depends on !UML
diff --git a/drivers/block/Makefile b/drivers/block/Makefile
index 9cc6c18a1c7e..02b688d1438d 100644
--- a/drivers/block/Makefile
+++ b/drivers/block/Makefile
@@ -14,7 +14,6 @@ obj-$(CONFIG_PS3_VRAM) += ps3vram.o
obj-$(CONFIG_ATARI_FLOPPY) += ataflop.o
obj-$(CONFIG_AMIGA_Z2RAM) += z2ram.o
obj-$(CONFIG_BLK_DEV_RAM) += brd.o
-obj-$(CONFIG_BLK_DEV_PMEM) += pmem.o
obj-$(CONFIG_BLK_DEV_LOOP) += loop.o
obj-$(CONFIG_BLK_CPQ_DA) += cpqarray.o
obj-$(CONFIG_BLK_CPQ_CISS_DA) += cciss.o
diff --git a/drivers/block/pmem.c b/drivers/block/pmem.c
deleted file mode 100644
index eabf4a8d0085..000000000000
--- a/drivers/block/pmem.c
+++ /dev/null
@@ -1,262 +0,0 @@
-/*
- * Persistent Memory Driver
- *
- * Copyright (c) 2014, Intel Corporation.
- * Copyright (c) 2015, Christoph Hellwig <hch@lst.de>.
- * Copyright (c) 2015, Boaz Harrosh <boaz@plexistor.com>.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms and conditions of the GNU General Public License,
- * version 2, as published by the Free Software Foundation.
- *
- * This program is distributed in the hope it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
- * more details.
- */
-
-#include <asm/cacheflush.h>
-#include <linux/blkdev.h>
-#include <linux/hdreg.h>
-#include <linux/init.h>
-#include <linux/platform_device.h>
-#include <linux/module.h>
-#include <linux/moduleparam.h>
-#include <linux/slab.h>
-
-#define PMEM_MINORS 16
-
-struct pmem_device {
- struct request_queue *pmem_queue;
- struct gendisk *pmem_disk;
-
- /* One contiguous memory region per device */
- phys_addr_t phys_addr;
- void *virt_addr;
- size_t size;
-};
-
-static int pmem_major;
-static atomic_t pmem_index;
-
-static void pmem_do_bvec(struct pmem_device *pmem, struct page *page,
- unsigned int len, unsigned int off, int rw,
- sector_t sector)
-{
- void *mem = kmap_atomic(page);
- size_t pmem_off = sector << 9;
-
- if (rw == READ) {
- memcpy(mem + off, pmem->virt_addr + pmem_off, len);
- flush_dcache_page(page);
- } else {
- flush_dcache_page(page);
- memcpy(pmem->virt_addr + pmem_off, mem + off, len);
- }
-
- kunmap_atomic(mem);
-}
-
-static void pmem_make_request(struct request_queue *q, struct bio *bio)
-{
- struct block_device *bdev = bio->bi_bdev;
- struct pmem_device *pmem = bdev->bd_disk->private_data;
- int rw;
- struct bio_vec bvec;
- sector_t sector;
- struct bvec_iter iter;
- int err = 0;
-
- if (bio_end_sector(bio) > get_capacity(bdev->bd_disk)) {
- err = -EIO;
- goto out;
- }
-
- BUG_ON(bio->bi_rw & REQ_DISCARD);
-
- rw = bio_data_dir(bio);
- sector = bio->bi_iter.bi_sector;
- bio_for_each_segment(bvec, bio, iter) {
- pmem_do_bvec(pmem, bvec.bv_page, bvec.bv_len, bvec.bv_offset,
- rw, sector);
- sector += bvec.bv_len >> 9;
- }
-
-out:
- bio_endio(bio, err);
-}
-
-static int pmem_rw_page(struct block_device *bdev, sector_t sector,
- struct page *page, int rw)
-{
- struct pmem_device *pmem = bdev->bd_disk->private_data;
-
- pmem_do_bvec(pmem, page, PAGE_CACHE_SIZE, 0, rw, sector);
- page_endio(page, rw & WRITE, 0);
-
- return 0;
-}
-
-static long pmem_direct_access(struct block_device *bdev, sector_t sector,
- void **kaddr, unsigned long *pfn, long size)
-{
- struct pmem_device *pmem = bdev->bd_disk->private_data;
- size_t offset = sector << 9;
-
- if (!pmem)
- return -ENODEV;
-
- *kaddr = pmem->virt_addr + offset;
- *pfn = (pmem->phys_addr + offset) >> PAGE_SHIFT;
-
- return pmem->size - offset;
-}
-
-static const struct block_device_operations pmem_fops = {
- .owner = THIS_MODULE,
- .rw_page = pmem_rw_page,
- .direct_access = pmem_direct_access,
-};
-
-static struct pmem_device *pmem_alloc(struct device *dev, struct resource *res)
-{
- struct pmem_device *pmem;
- struct gendisk *disk;
- int idx, err;
-
- err = -ENOMEM;
- pmem = kzalloc(sizeof(*pmem), GFP_KERNEL);
- if (!pmem)
- goto out;
-
- pmem->phys_addr = res->start;
- pmem->size = resource_size(res);
-
- err = -EINVAL;
- if (!request_mem_region(pmem->phys_addr, pmem->size, "pmem")) {
- dev_warn(dev, "could not reserve region [0x%pa:0x%zx]\n", &pmem->phys_addr, pmem->size);
- goto out_free_dev;
- }
-
- /*
- * Map the memory as non-cachable, as we can't write back the contents
- * of the CPU caches in case of a crash.
- */
- err = -ENOMEM;
- pmem->virt_addr = ioremap_nocache(pmem->phys_addr, pmem->size);
- if (!pmem->virt_addr)
- goto out_release_region;
-
- pmem->pmem_queue = blk_alloc_queue(GFP_KERNEL);
- if (!pmem->pmem_queue)
- goto out_unmap;
-
- blk_queue_make_request(pmem->pmem_queue, pmem_make_request);
- blk_queue_max_hw_sectors(pmem->pmem_queue, 1024);
- blk_queue_bounce_limit(pmem->pmem_queue, BLK_BOUNCE_ANY);
-
- disk = alloc_disk(PMEM_MINORS);
- if (!disk)
- goto out_free_queue;
-
- idx = atomic_inc_return(&pmem_index) - 1;
-
- disk->major = pmem_major;
- disk->first_minor = PMEM_MINORS * idx;
- disk->fops = &pmem_fops;
- disk->private_data = pmem;
- disk->queue = pmem->pmem_queue;
- disk->flags = GENHD_FL_EXT_DEVT;
- sprintf(disk->disk_name, "pmem%d", idx);
- disk->driverfs_dev = dev;
- set_capacity(disk, pmem->size >> 9);
- pmem->pmem_disk = disk;
-
- add_disk(disk);
-
- return pmem;
-
-out_free_queue:
- blk_cleanup_queue(pmem->pmem_queue);
-out_unmap:
- iounmap(pmem->virt_addr);
-out_release_region:
- release_mem_region(pmem->phys_addr, pmem->size);
-out_free_dev:
- kfree(pmem);
-out:
- return ERR_PTR(err);
-}
-
-static void pmem_free(struct pmem_device *pmem)
-{
- del_gendisk(pmem->pmem_disk);
- put_disk(pmem->pmem_disk);
- blk_cleanup_queue(pmem->pmem_queue);
- iounmap(pmem->virt_addr);
- release_mem_region(pmem->phys_addr, pmem->size);
- kfree(pmem);
-}
-
-static int pmem_probe(struct platform_device *pdev)
-{
- struct pmem_device *pmem;
- struct resource *res;
-
- if (WARN_ON(pdev->num_resources > 1))
- return -ENXIO;
-
- res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (!res)
- return -ENXIO;
-
- pmem = pmem_alloc(&pdev->dev, res);
- if (IS_ERR(pmem))
- return PTR_ERR(pmem);
-
- platform_set_drvdata(pdev, pmem);
-
- return 0;
-}
-
-static int pmem_remove(struct platform_device *pdev)
-{
- struct pmem_device *pmem = platform_get_drvdata(pdev);
-
- pmem_free(pmem);
- return 0;
-}
-
-static struct platform_driver pmem_driver = {
- .probe = pmem_probe,
- .remove = pmem_remove,
- .driver = {
- .owner = THIS_MODULE,
- .name = "pmem",
- },
-};
-
-static int __init pmem_init(void)
-{
- int error;
-
- pmem_major = register_blkdev(0, "pmem");
- if (pmem_major < 0)
- return pmem_major;
-
- error = platform_driver_register(&pmem_driver);
- if (error)
- unregister_blkdev(pmem_major, "pmem");
- return error;
-}
-module_init(pmem_init);
-
-static void pmem_exit(void)
-{
- platform_driver_unregister(&pmem_driver);
- unregister_blkdev(pmem_major, "pmem");
-}
-module_exit(pmem_exit);
-
-MODULE_AUTHOR("Ross Zwisler <ross.zwisler@linux.intel.com>");
-MODULE_LICENSE("GPL v2");
diff --git a/drivers/nvdimm/Kconfig b/drivers/nvdimm/Kconfig
index 4f2291938ea0..818f219b037c 100644
--- a/drivers/nvdimm/Kconfig
+++ b/drivers/nvdimm/Kconfig
@@ -1,4 +1,4 @@
-config LIBNVDIMM
+menuconfig LIBNVDIMM
tristate "NVDIMM (Non-Volatile Memory Device) Support"
help
Generic support for non-volatile memory devices including
@@ -11,3 +11,23 @@ config LIBNVDIMM
CONFIG_DAX). A BLK namespace refers to an NVDIMM control
region which exposes an mmio register set for windowed
access mode to non-volatile memory.
+
+if LIBNVDIMM
+
+config BLK_DEV_PMEM
+ tristate "PMEM: Persistent memory block device support"
+ default LIBNVDIMM
+ help
+ Memory ranges for PMEM are described by either an NFIT
+ (NVDIMM Firmware Interface Table, see CONFIG_NFIT_ACPI), a
+ non-standard OEM-specific E820 memory type (type-12, see
+ CONFIG_X86_PMEM_LEGACY), or it is manually specified by the
+ 'memmap=nn[KMG]!ss[KMG]' kernel command line (see
+ Documentation/kernel-parameters.txt). This driver converts
+ these persistent memory ranges into block devices that are
+ capable of DAX (direct-access) file system mappings. See
+ Documentation/blockdev/nd.txt for more details.
+
+ Say Y if you want to use a NVDIMM described by NFIT
+
+endif
diff --git a/drivers/nvdimm/Makefile b/drivers/nvdimm/Makefile
index af5e2760ddbd..4d2a27f52faa 100644
--- a/drivers/nvdimm/Makefile
+++ b/drivers/nvdimm/Makefile
@@ -1,4 +1,7 @@
obj-$(CONFIG_LIBNVDIMM) += libnvdimm.o
+obj-$(CONFIG_BLK_DEV_PMEM) += nd_pmem.o
+
+nd_pmem-y := pmem.o
libnvdimm-y := core.o
libnvdimm-y += bus.o
diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c
new file mode 100644
index 000000000000..cf5d53eda9e5
--- /dev/null
+++ b/drivers/nvdimm/pmem.c
@@ -0,0 +1,260 @@
+/*
+ * Persistent Memory Driver
+ *
+ * Copyright (c) 2014-2015, Intel Corporation.
+ * Copyright (c) 2015, Christoph Hellwig <hch@lst.de>.
+ * Copyright (c) 2015, Boaz Harrosh <boaz@plexistor.com>.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ */
+
+#include <asm/cacheflush.h>
+#include <linux/blkdev.h>
+#include <linux/hdreg.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/slab.h>
+#include <linux/nd.h>
+#include "nd.h"
+
+#define PMEM_MINORS 16
+
+struct pmem_device {
+ struct request_queue *pmem_queue;
+ struct gendisk *pmem_disk;
+
+ /* One contiguous memory region per device */
+ phys_addr_t phys_addr;
+ void *virt_addr;
+ size_t size;
+};
+
+static int pmem_major;
+
+static void pmem_do_bvec(struct pmem_device *pmem, struct page *page,
+ unsigned int len, unsigned int off, int rw,
+ sector_t sector)
+{
+ void *mem = kmap_atomic(page);
+ size_t pmem_off = sector << 9;
+
+ if (rw == READ) {
+ memcpy(mem + off, pmem->virt_addr + pmem_off, len);
+ flush_dcache_page(page);
+ } else {
+ flush_dcache_page(page);
+ memcpy(pmem->virt_addr + pmem_off, mem + off, len);
+ }
+
+ kunmap_atomic(mem);
+}
+
+static void pmem_make_request(struct request_queue *q, struct bio *bio)
+{
+ struct block_device *bdev = bio->bi_bdev;
+ struct pmem_device *pmem = bdev->bd_disk->private_data;
+ int rw;
+ struct bio_vec bvec;
+ sector_t sector;
+ struct bvec_iter iter;
+ int err = 0;
+
+ if (bio_end_sector(bio) > get_capacity(bdev->bd_disk)) {
+ err = -EIO;
+ goto out;
+ }
+
+ BUG_ON(bio->bi_rw & REQ_DISCARD);
+
+ rw = bio_data_dir(bio);
+ sector = bio->bi_iter.bi_sector;
+ bio_for_each_segment(bvec, bio, iter) {
+ pmem_do_bvec(pmem, bvec.bv_page, bvec.bv_len, bvec.bv_offset,
+ rw, sector);
+ sector += bvec.bv_len >> 9;
+ }
+
+out:
+ bio_endio(bio, err);
+}
+
+static int pmem_rw_page(struct block_device *bdev, sector_t sector,
+ struct page *page, int rw)
+{
+ struct pmem_device *pmem = bdev->bd_disk->private_data;
+
+ pmem_do_bvec(pmem, page, PAGE_CACHE_SIZE, 0, rw, sector);
+ page_endio(page, rw & WRITE, 0);
+
+ return 0;
+}
+
+static long pmem_direct_access(struct block_device *bdev, sector_t sector,
+ void **kaddr, unsigned long *pfn, long size)
+{
+ struct pmem_device *pmem = bdev->bd_disk->private_data;
+ size_t offset = sector << 9;
+
+ if (!pmem)
+ return -ENODEV;
+
+ *kaddr = pmem->virt_addr + offset;
+ *pfn = (pmem->phys_addr + offset) >> PAGE_SHIFT;
+
+ return pmem->size - offset;
+}
+
+static const struct block_device_operations pmem_fops = {
+ .owner = THIS_MODULE,
+ .rw_page = pmem_rw_page,
+ .direct_access = pmem_direct_access,
+};
+
+static struct pmem_device *pmem_alloc(struct device *dev, struct resource *res, int id)
+{
+ struct pmem_device *pmem;
+ struct gendisk *disk;
+ int err;
+
+ err = -ENOMEM;
+ pmem = kzalloc(sizeof(*pmem), GFP_KERNEL);
+ if (!pmem)
+ goto out;
+
+ pmem->phys_addr = res->start;
+ pmem->size = resource_size(res);
+
+ err = -EINVAL;
+ if (!request_mem_region(pmem->phys_addr, pmem->size, "pmem")) {
+ dev_warn(dev, "could not reserve region [0x%pa:0x%zx]\n", &pmem->phys_addr, pmem->size);
+ goto out_free_dev;
+ }
+
+ /*
+ * Map the memory as non-cachable, as we can't write back the contents
+ * of the CPU caches in case of a crash.
+ */
+ err = -ENOMEM;
+ pmem->virt_addr = ioremap_nocache(pmem->phys_addr, pmem->size);
+ if (!pmem->virt_addr)
+ goto out_release_region;
+
+ pmem->pmem_queue = blk_alloc_queue(GFP_KERNEL);
+ if (!pmem->pmem_queue)
+ goto out_unmap;
+
+ blk_queue_make_request(pmem->pmem_queue, pmem_make_request);
+ blk_queue_max_hw_sectors(pmem->pmem_queue, 1024);
+ blk_queue_bounce_limit(pmem->pmem_queue, BLK_BOUNCE_ANY);
+
+ disk = alloc_disk(PMEM_MINORS);
+ if (!disk)
+ goto out_free_queue;
+
+ disk->major = pmem_major;
+ disk->first_minor = PMEM_MINORS * id;
+ disk->fops = &pmem_fops;
+ disk->private_data = pmem;
+ disk->queue = pmem->pmem_queue;
+ disk->flags = GENHD_FL_EXT_DEVT;
+ sprintf(disk->disk_name, "pmem%d", id);
+ disk->driverfs_dev = dev;
+ set_capacity(disk, pmem->size >> 9);
+ pmem->pmem_disk = disk;
+
+ add_disk(disk);
+
+ return pmem;
+
+out_free_queue:
+ blk_cleanup_queue(pmem->pmem_queue);
+out_unmap:
+ iounmap(pmem->virt_addr);
+out_release_region:
+ release_mem_region(pmem->phys_addr, pmem->size);
+out_free_dev:
+ kfree(pmem);
+out:
+ return ERR_PTR(err);
+}
+
+static void pmem_free(struct pmem_device *pmem)
+{
+ del_gendisk(pmem->pmem_disk);
+ put_disk(pmem->pmem_disk);
+ blk_cleanup_queue(pmem->pmem_queue);
+ iounmap(pmem->virt_addr);
+ release_mem_region(pmem->phys_addr, pmem->size);
+ kfree(pmem);
+}
+
+static int nd_pmem_probe(struct device *dev)
+{
+ struct nd_region *nd_region = to_nd_region(dev->parent);
+ struct nd_namespace_io *nsio = to_nd_namespace_io(dev);
+ struct pmem_device *pmem;
+
+ pmem = pmem_alloc(dev, &nsio->res, nd_region->id);
+ if (IS_ERR(pmem))
+ return PTR_ERR(pmem);
+
+ dev_set_drvdata(dev, pmem);
+
+ return 0;
+}
+
+static int nd_pmem_remove(struct device *dev)
+{
+ struct pmem_device *pmem = dev_get_drvdata(dev);
+
+ pmem_free(pmem);
+ return 0;
+}
+
+MODULE_ALIAS("pmem");
+MODULE_ALIAS_ND_DEVICE(ND_DEVICE_NAMESPACE_IO);
+static struct nd_device_driver nd_pmem_driver = {
+ .probe = nd_pmem_probe,
+ .remove = nd_pmem_remove,
+ .drv = {
+ .name = "nd_pmem",
+ },
+ .type = ND_DRIVER_NAMESPACE_IO,
+};
+
+static int __init pmem_init(void)
+{
+ int error;
+
+ pmem_major = register_blkdev(0, "pmem");
+ if (pmem_major < 0)
+ return pmem_major;
+
+ error = nd_driver_register(&nd_pmem_driver);
+ if (error) {
+ unregister_blkdev(pmem_major, "pmem");
+ return error;
+ }
+
+ return 0;
+}
+module_init(pmem_init);
+
+static void pmem_exit(void)
+{
+ driver_unregister(&nd_pmem_driver.drv);
+ unregister_blkdev(pmem_major, "pmem");
+}
+module_exit(pmem_exit);
+
+MODULE_AUTHOR("Ross Zwisler <ross.zwisler@linux.intel.com>");
+MODULE_LICENSE("GPL v2");
ÿôèº{.nÇ+‰·Ÿ®‰†+%ŠËÿ±éݶ\x17¥Šwÿº{.nÇ+‰·¥Š{±þG«éÿŠ{ayº\x1dʇڙë,j\a¢f£¢·hšïêÿ‘êçz_è®\x03(階ŠÝ¢j"ú\x1a¶^[m§ÿÿ¾\a«þG«éÿ¢¸?™¨èÚ&£ø§~á¶iO•æ¬z·švØ^\x14\x04\x1a¶^[m§ÿÿÃ\fÿ¶ìÿ¢¸?–I¥
^ permalink raw reply related [flat|nested] 47+ messages in thread
* Re: [PATCH v5 02/21] libnvdimm, nfit: initial libnvdimm infrastructure and NFIT support
2015-06-03 19:24 ` Williams, Dan J
@ 2015-06-09 6:33 ` hch
2015-06-09 22:27 ` Dan Williams
0 siblings, 1 reply; 47+ messages in thread
From: hch @ 2015-06-09 6:33 UTC (permalink / raw)
To: Williams, Dan J
Cc: hch, linux-kernel, mingo, neilb, jmoyer, linux-api, axboe, akpm,
sfr, linux-nvdimm@lists.01.org, gregkh, rafael, linux-acpi
On Wed, Jun 03, 2015 at 07:24:34PM +0000, Williams, Dan J wrote:
> > > +static inline struct acpi_nfit_memory_map *__to_nfit_memdev(struct nfit_mem *nfit_mem)
> >
> > This line is over 80 characters.
>
> I generally don't see the point of fixing up occasional small incursions
> over 80 characters if it makes the code more amenable to grep.
Just use shorter type names or add a line break before the symbol
names. Too long lines are highly annoying.
^ permalink raw reply [flat|nested] 47+ messages in thread
* Re: [PATCH v5 05/21] libnvdimm: control (ioctl) messages for libnvdimm bus and dimm devices
2015-06-02 0:14 ` [PATCH v5 05/21] libnvdimm: control (ioctl) messages for libnvdimm bus and dimm devices Dan Williams
@ 2015-06-09 6:34 ` Christoph Hellwig
2015-06-09 6:57 ` Dan Williams
0 siblings, 1 reply; 47+ messages in thread
From: Christoph Hellwig @ 2015-06-09 6:34 UTC (permalink / raw)
To: Dan Williams
Cc: linux-nvdimm, axboe, sfr, rafael, neilb, gregkh, linux-kernel,
mingo, linux-acpi, jmoyer, linux-api, akpm, hch
On Mon, Jun 01, 2015 at 08:14:35PM -0400, Dan Williams wrote:
> Most discovery/configuration of the libnvdimm-subsystem is done via
> sysfs attributes. However, some libnvdimm buses, particularly the
> ACPI.NFIT bus, define a small set of messages that can be passed to the
> platform. For convenience we derive the initial libnvdimm-ioctl command
> formats directly from the NFIT DSM Interface Example formats.
Why not merge these into the extensive sysfs interface?
^ permalink raw reply [flat|nested] 47+ messages in thread
* Re: [PATCH v5 09/21] libnvdimm, nd_pmem: add libnvdimm support to the pmem driver
2015-06-03 19:31 ` Williams, Dan J
@ 2015-06-09 6:36 ` hch
0 siblings, 0 replies; 47+ messages in thread
From: hch @ 2015-06-09 6:36 UTC (permalink / raw)
To: Williams, Dan J
Cc: hch, linux-kernel, mingo, linux-nvdimm, neilb, linux-api, hch,
axboe, akpm, sfr, gregkh, rafael, linux-acpi
On Wed, Jun 03, 2015 at 07:31:38PM +0000, Williams, Dan J wrote:
> I like move-modify patches because they make the reason for the move
> clearer and revertible. Consider a general case where we later decide
> the reason for a move was invalid. Reverting the reason also reverts
> the file move, that doesn't automatically happen when it is split to
> another commit.
BS. A move is never fundamentally related to the change. Your
series would work perfectly fine without the move for example.
^ permalink raw reply [flat|nested] 47+ messages in thread
* Re: [PATCH v5 12/21] libnvdimm: namespace indices: read and validate
2015-06-02 0:15 ` [PATCH v5 12/21] libnvdimm: namespace indices: read and validate Dan Williams
@ 2015-06-09 6:39 ` Christoph Hellwig
2015-06-10 15:54 ` Dan Williams
0 siblings, 1 reply; 47+ messages in thread
From: Christoph Hellwig @ 2015-06-09 6:39 UTC (permalink / raw)
To: Dan Williams
Cc: linux-nvdimm, axboe, sfr, rafael, neilb, gregkh, linux-kernel,
mingo, linux-acpi, jmoyer, linux-api, akpm, hch
> +#include <asm-generic/io-64-nonatomic-lo-hi.h>
> +
> +#ifndef __io_virt
> +#define __io_virt(x) ((void __force *) (x))
> +#endif
NAK. driver code mus never include asm-generic headers directly,
and __io_virt isn't something that's up to a driver to redefine either.
I think we really need the memremap series in first before trying to
do the things done in this patch.
^ permalink raw reply [flat|nested] 47+ messages in thread
* Re: [PATCH v5 17/21] libnvdimm: infrastructure for btt devices
2015-06-02 0:15 ` [PATCH v5 17/21] libnvdimm: infrastructure for btt devices Dan Williams
@ 2015-06-09 6:42 ` Christoph Hellwig
2015-06-10 18:46 ` Matthew Wilcox
0 siblings, 1 reply; 47+ messages in thread
From: Christoph Hellwig @ 2015-06-09 6:42 UTC (permalink / raw)
To: Dan Williams
Cc: linux-nvdimm, axboe, sfr, rafael, neilb, gregkh, linux-kernel,
mingo, linux-acpi, jmoyer, linux-api, akpm, hch
On Mon, Jun 01, 2015 at 08:15:41PM -0400, Dan Williams wrote:
> Block devices from an nd bus, in addition to accepting "struct bio"
> based requests, also have the capability to perform byte-aligned
> accesses. By default only the bio/block interface is used. However, if
> another driver can make effective use of the byte-aligned capability it
> can claim/disable the block interface and use the byte-aligned "nd_io"
> interface.
>
> The BTT driver is the initial first consumer of this mechanism to allow
> layering atomic sector update guarantees on top of nd_io capable
> libnvdimm-block-devices, or their partitions.
As mentioned during the last time of the review the layering here
is complete broken. If you expose additional capabilities from a block
device do it at the block device level. That is enhance the rw_page
callback to allo byte sized access, add a capability flag on the queue,
etc.
^ permalink raw reply [flat|nested] 47+ messages in thread
* Re: [PATCH v5 18/21] nd_btt: atomic sector updates
2015-06-02 0:15 ` [PATCH v5 18/21] nd_btt: atomic sector updates Dan Williams
@ 2015-06-09 6:44 ` Christoph Hellwig
2015-06-09 18:27 ` Vishal Verma
0 siblings, 1 reply; 47+ messages in thread
From: Christoph Hellwig @ 2015-06-09 6:44 UTC (permalink / raw)
To: Dan Williams
Cc: linux-nvdimm, axboe, sfr, rafael, neilb, gregkh, linux-kernel,
mingo, linux-acpi, jmoyer, linux-api, akpm, hch
I really want to see a good explanation why this is not a blk-mq driver
given that it does fairly substantial work and has synchronization
in its make_request function.
^ permalink raw reply [flat|nested] 47+ messages in thread
* Re: [PATCH v5 20/21] tools/testing/nvdimm: manufactured NFITs for interface development
2015-06-02 0:15 ` [PATCH v5 20/21] tools/testing/nvdimm: manufactured NFITs for interface development Dan Williams
@ 2015-06-09 6:48 ` Christoph Hellwig
2015-06-11 20:12 ` Dan Williams
0 siblings, 1 reply; 47+ messages in thread
From: Christoph Hellwig @ 2015-06-09 6:48 UTC (permalink / raw)
To: Dan Williams
Cc: linux-nvdimm, axboe, sfr, rafael, neilb, gregkh, linux-kernel,
mingo, linux-acpi, jmoyer, linux-api, akpm, hch
The description fails to mention the hacks how this is archived. I don't
think the include hackery and otherwise needed exports are acceptable
if with an explanation, though.
Really - get your fake hardware into qemu right now and don't bother
with trying to hack the subsystem like this.
^ permalink raw reply [flat|nested] 47+ messages in thread
* Re: [PATCH v5 05/21] libnvdimm: control (ioctl) messages for libnvdimm bus and dimm devices
2015-06-09 6:34 ` Christoph Hellwig
@ 2015-06-09 6:57 ` Dan Williams
2015-06-10 7:33 ` Christoph Hellwig
0 siblings, 1 reply; 47+ messages in thread
From: Dan Williams @ 2015-06-09 6:57 UTC (permalink / raw)
To: Christoph Hellwig
Cc: linux-nvdimm@lists.01.org, Jens Axboe, Stephen Rothwell,
Rafael J. Wysocki, Neil Brown, Greg KH, linux-kernel,
Ingo Molnar, Linux ACPI, jmoyer, linux-api, Andrew Morton
On Mon, Jun 8, 2015 at 11:34 PM, Christoph Hellwig <hch@lst.de> wrote:
> On Mon, Jun 01, 2015 at 08:14:35PM -0400, Dan Williams wrote:
>> Most discovery/configuration of the libnvdimm-subsystem is done via
>> sysfs attributes. However, some libnvdimm buses, particularly the
>> ACPI.NFIT bus, define a small set of messages that can be passed to the
>> platform. For convenience we derive the initial libnvdimm-ioctl command
>> formats directly from the NFIT DSM Interface Example formats.
>
> Why not merge these into the extensive sysfs interface?
Data payload size for one, these commands transfer more than a page
worth of data at a time.
Even if we killed the ioctl interface to userspace we still need all
the ugly data marshaling code in the kernel to craft properly
formatted ACPI _DSM messages. I try to share as much common
infrastructure from the ACPI _DSM implementation to the ioctl
interface (nd_cmd_dimm_desc() + nd_cmd_bus_desc()).
^ permalink raw reply [flat|nested] 47+ messages in thread
* Re: [PATCH v5 18/21] nd_btt: atomic sector updates
2015-06-09 6:44 ` Christoph Hellwig
@ 2015-06-09 18:27 ` Vishal Verma
2015-06-10 7:34 ` Christoph Hellwig
0 siblings, 1 reply; 47+ messages in thread
From: Vishal Verma @ 2015-06-09 18:27 UTC (permalink / raw)
To: Christoph Hellwig
Cc: Dan Williams, axboe, sfr, rafael, neilb, gregkh, linux-nvdimm,
linux-kernel, linux-acpi, linux-api, akpm, mingo
On Tue, 2015-06-09 at 08:44 +0200, Christoph Hellwig wrote:
> I really want to see a good explanation why this is not a blk-mq driver
> given that it does fairly substantial work and has synchronization
> in its make_request function.
The biggest reason, I think, is that the BTT (just like pmem, brd etc),
does all its IOs synchronously. There isn't any queuing being done by
the device.
There are three places where we do synchronization in the BTT. Two of
them - map locks, and lanes are intrinsic to the BTT algorithm, so the
one you referred to must be the 'RTT' (the path that stalls writes if
the free block they picked to write to is being read from). My reasoning
is that since we're talking about DRAM-like speeds, and the reader(s)
will be reading at most one LBA, the wait for the writer is really
bounded, and queuing and switching to a different IO on a CPU seems more
expensive than just waiting out the readers.
Even for the lane locks, we did a comparison between two lane lock
strategies - first where we kept an atomic counter around that tracked
which was the last lane that was used, and 'our' lane was determined by
atomically incrementing that. That way, if there are more CPUs than
lanes available, theoretically, no CPU would be blocked waiting for a
lane. The other strategy was to use the cpu number we're scheduled on to
and hash it to a lane number. Theoretically, this could block an IO that
could've otherwise run using a different, free lane. But some fio
workloads showed that the direct cpu -> lane hash performed faster than
tracking 'last lane' - my reasoning is the cache thrash caused by moving
the atomic variable made that approach slower than simply waiting out
the in-progress IO. Wouldn't adding to a queue be even more overhead
than a bit of cache thrash on a single variable?
The devices being synchronous, there is also no question of async
completions that might need to be handled - so I don't really see any
benefits that request queues might get us. Allow me to turn the question
around, and ask what will blk-mq get us?
Thanks,
-Vishal
^ permalink raw reply [flat|nested] 47+ messages in thread
* Re: [PATCH v5 02/21] libnvdimm, nfit: initial libnvdimm infrastructure and NFIT support
2015-06-09 6:33 ` hch
@ 2015-06-09 22:27 ` Dan Williams
0 siblings, 0 replies; 47+ messages in thread
From: Dan Williams @ 2015-06-09 22:27 UTC (permalink / raw)
To: hch
Cc: linux-kernel, mingo, neilb, jmoyer, linux-api, axboe, akpm, sfr,
linux-nvdimm@lists.01.org, gregkh, rafael, linux-acpi
On Mon, Jun 8, 2015 at 11:33 PM, hch@lst.de <hch@lst.de> wrote:
> On Wed, Jun 03, 2015 at 07:24:34PM +0000, Williams, Dan J wrote:
>> > > +static inline struct acpi_nfit_memory_map *__to_nfit_memdev(struct nfit_mem *nfit_mem)
>> >
>> > This line is over 80 characters.
>>
>> I generally don't see the point of fixing up occasional small incursions
>> over 80 characters if it makes the code more amenable to grep.
>
> Just use shorter type names or add a line break before the symbol
> names. Too long lines are highly annoying.
Note that "acpi_nfit_memory_map" is the identifier chosen by ACPICA,
I'm just a consumer. That said I've gone and done a 80 column cleanup
across all the patches.
^ permalink raw reply [flat|nested] 47+ messages in thread
* Re: [PATCH v5 05/21] libnvdimm: control (ioctl) messages for libnvdimm bus and dimm devices
2015-06-09 6:57 ` Dan Williams
@ 2015-06-10 7:33 ` Christoph Hellwig
0 siblings, 0 replies; 47+ messages in thread
From: Christoph Hellwig @ 2015-06-10 7:33 UTC (permalink / raw)
To: Dan Williams
Cc: Christoph Hellwig, linux-nvdimm@lists.01.org, Jens Axboe,
Stephen Rothwell, Rafael J. Wysocki, Neil Brown, Greg KH,
linux-kernel, Ingo Molnar, Linux ACPI, jmoyer, linux-api,
Andrew Morton
On Mon, Jun 08, 2015 at 11:57:42PM -0700, Dan Williams wrote:
> Data payload size for one, these commands transfer more than a page
> worth of data at a time.
>
> Even if we killed the ioctl interface to userspace we still need all
> the ugly data marshaling code in the kernel to craft properly
> formatted ACPI _DSM messages. I try to share as much common
> infrastructure from the ACPI _DSM implementation to the ioctl
> interface (nd_cmd_dimm_desc() + nd_cmd_bus_desc()).
Ok. Not a fan of these dual interfaces but in this case they might be
justified.
^ permalink raw reply [flat|nested] 47+ messages in thread
* Re: [PATCH v5 18/21] nd_btt: atomic sector updates
2015-06-09 18:27 ` Vishal Verma
@ 2015-06-10 7:34 ` Christoph Hellwig
2015-06-10 18:24 ` Vishal Verma
0 siblings, 1 reply; 47+ messages in thread
From: Christoph Hellwig @ 2015-06-10 7:34 UTC (permalink / raw)
To: Vishal Verma
Cc: Dan Williams, axboe, sfr, rafael, neilb, gregkh, linux-nvdimm,
linux-kernel, linux-acpi, linux-api, akpm, mingo
Hi Vishal,
I'm mostly worried about handling scalability to large CPU counts
properly. If you think this is the best way to handle it that fine,
but please document the decisions on the changelog in a similar form
to what you did below.
^ permalink raw reply [flat|nested] 47+ messages in thread
* Re: [PATCH v5 12/21] libnvdimm: namespace indices: read and validate
2015-06-09 6:39 ` Christoph Hellwig
@ 2015-06-10 15:54 ` Dan Williams
0 siblings, 0 replies; 47+ messages in thread
From: Dan Williams @ 2015-06-10 15:54 UTC (permalink / raw)
To: Christoph Hellwig
Cc: linux-nvdimm@lists.01.org, Jens Axboe, Stephen Rothwell,
Rafael J. Wysocki, Neil Brown, Greg KH, linux-kernel,
Ingo Molnar, Linux ACPI, jmoyer, linux-api, Andrew Morton
On Mon, Jun 8, 2015 at 11:39 PM, Christoph Hellwig <hch@lst.de> wrote:
>> +#include <asm-generic/io-64-nonatomic-lo-hi.h>
>> +
>> +#ifndef __io_virt
>> +#define __io_virt(x) ((void __force *) (x))
>> +#endif
>
> NAK. driver code mus never include asm-generic headers directly,
> and __io_virt isn't something that's up to a driver to redefine either.
>
> I think we really need the memremap series in first before trying to
> do the things done in this patch.
I was abusing read[wlq] and write[wlq]. All this patch needs is a
conversion to use __leXXto_cpu and __cpu_to_leXX helpers.
^ permalink raw reply [flat|nested] 47+ messages in thread
* Re: [PATCH v5 18/21] nd_btt: atomic sector updates
2015-06-10 7:34 ` Christoph Hellwig
@ 2015-06-10 18:24 ` Vishal Verma
0 siblings, 0 replies; 47+ messages in thread
From: Vishal Verma @ 2015-06-10 18:24 UTC (permalink / raw)
To: Christoph Hellwig
Cc: Dan Williams, axboe, sfr, rafael, neilb, gregkh, linux-nvdimm,
linux-kernel, linux-acpi, linux-api, akpm, mingo
On Wed, 2015-06-10 at 09:34 +0200, Christoph Hellwig wrote:
> Hi Vishal,
>
> I'm mostly worried about handling scalability to large CPU counts
> properly. If you think this is the best way to handle it that fine,
> but please document the decisions on the changelog in a similar form
> to what you did below.
Thanks Christoph.
I'll update the changelog for the next version. Scalability and
performance are of course at the top of my head - this implementation is
a first shot at what we think will work best, but if there are
experiments/changes/data that show otherwise, I'll be more than happy to
incorporate those.
-Vishal
^ permalink raw reply [flat|nested] 47+ messages in thread
* Re: [PATCH v5 17/21] libnvdimm: infrastructure for btt devices
2015-06-09 6:42 ` Christoph Hellwig
@ 2015-06-10 18:46 ` Matthew Wilcox
2015-06-11 7:28 ` Christoph Hellwig
0 siblings, 1 reply; 47+ messages in thread
From: Matthew Wilcox @ 2015-06-10 18:46 UTC (permalink / raw)
To: Christoph Hellwig
Cc: Dan Williams, axboe, sfr, rafael, neilb, gregkh, linux-nvdimm,
linux-kernel, linux-acpi, linux-api, akpm, mingo
On Tue, Jun 09, 2015 at 08:42:00AM +0200, Christoph Hellwig wrote:
> > The BTT driver is the initial first consumer of this mechanism to allow
> > layering atomic sector update guarantees on top of nd_io capable
> > libnvdimm-block-devices, or their partitions.
>
> As mentioned during the last time of the review the layering here
> is complete broken. If you expose additional capabilities from a block
> device do it at the block device level. That is enhance the rw_page
> callback to allo byte sized access, add a capability flag on the queue,
> etc.
Don't screw up rw_page. The point of rw_page is to read or write a page
cache page. It can sleep, and it indicates success by using the page
flags. Don't try and scqueeze rw_bytes into it. If you want rw_bytes
to be a queue operation, that's one thing, but don't mess with rw_page.
^ permalink raw reply [flat|nested] 47+ messages in thread
* Re: [PATCH v5 17/21] libnvdimm: infrastructure for btt devices
2015-06-10 18:46 ` Matthew Wilcox
@ 2015-06-11 7:28 ` Christoph Hellwig
2015-06-17 16:47 ` Jeff Moyer
0 siblings, 1 reply; 47+ messages in thread
From: Christoph Hellwig @ 2015-06-11 7:28 UTC (permalink / raw)
To: Matthew Wilcox
Cc: Christoph Hellwig, Dan Williams, axboe, sfr, rafael, neilb,
gregkh, linux-nvdimm, linux-kernel, linux-acpi, linux-api, akpm,
mingo
On Wed, Jun 10, 2015 at 02:46:16PM -0400, Matthew Wilcox wrote:
> Don't screw up rw_page. The point of rw_page is to read or write a page
> cache page. It can sleep, and it indicates success by using the page
> flags. Don't try and scqueeze rw_bytes into it. If you want rw_bytes
> to be a queue operation, that's one thing, but don't mess with rw_page.
Oh, I forgot about the page manipulating nature. Yes, we'll need a different
operation in this case.
^ permalink raw reply [flat|nested] 47+ messages in thread
* Re: [PATCH v5 20/21] tools/testing/nvdimm: manufactured NFITs for interface development
2015-06-09 6:48 ` Christoph Hellwig
@ 2015-06-11 20:12 ` Dan Williams
0 siblings, 0 replies; 47+ messages in thread
From: Dan Williams @ 2015-06-11 20:12 UTC (permalink / raw)
To: Christoph Hellwig
Cc: linux-nvdimm@lists.01.org, Jens Axboe, Stephen Rothwell,
Rafael J. Wysocki, Neil Brown, Greg KH, linux-kernel,
Ingo Molnar, Linux ACPI, jmoyer, linux-api, Andrew Morton
On Mon, Jun 8, 2015 at 11:48 PM, Christoph Hellwig <hch@lst.de> wrote:
> The description fails to mention the hacks how this is archived. I don't
> think the include hackery and otherwise needed exports are acceptable
> if with an explanation, though.
I've killed the include hackery.
> Really - get your fake hardware into qemu right now and don't bother
> with trying to hack the subsystem like this.
Rest assured that NFIT enabling for QEMU/KVM is well under way, but I
disagree that QEMU is the right place to enable unit tests. Here is
the updated changelog that appears in "[PATCH v6 20/21]
tools/testing/nvdimm: libnvdimm unit test infrastructure":
---
tools/testing/nvdimm: libnvdimm unit test infrastructure
'libnvdimm' is the first driver sub-system in the kernel to implement
mocking for unit test coverage. The nfit_test module gets built as an
external module and arranges for external module replacements of nfit,
libnvdimm, nd_pmem, and nd_blk. These replacements use the linker
--wrap option to redirect calls to ioremap() + request_mem_region() to
custom defined unit test resources. The end result is a fully
functional nvdimm_bus, as far as userspace is concerned, but with the
capability to perform otherwise destructive tests on emulated
resources.
Q: Why not use QEMU for this emulation?
QEMU is not suitable for unit testing. QEMU's role is to faithfully
emulate the platform. A unit test's role is to unfaithfully implement
the platform with the goal of triggering bugs in the corners of the
sub-system implementation. As bugs are discovered in platforms, or
the sub-system itself, the unit tests are extended to backstop a fix
with a reproducer unit test.
Another problem with QEMU is that it would require coordination of 3
software projects instead of 2 (kernel + libndctl [1]) to maintain and
execute the tests. The chances for bit rot and the difficulty of
getting the tests running goes up non-linearly the more components
involved.
Q: Why submit this to the kernel tree instead of external modules in libndctl?
Simple, to alleviate the same risk that out-of-tree external modules
face. Updates to drivers/nvdimm/ can be immediately evaluated to see
if they have any impact on tools/testing/nvdimm/.
[1]: https://github.com/pmem/ndctl
^ permalink raw reply [flat|nested] 47+ messages in thread
* Re: [PATCH v5 17/21] libnvdimm: infrastructure for btt devices
2015-06-11 7:28 ` Christoph Hellwig
@ 2015-06-17 16:47 ` Jeff Moyer
2015-06-17 16:50 ` Dan Williams
0 siblings, 1 reply; 47+ messages in thread
From: Jeff Moyer @ 2015-06-17 16:47 UTC (permalink / raw)
To: Christoph Hellwig, Dan Williams
Cc: Matthew Wilcox, axboe, sfr, akpm, rafael, neilb, gregkh,
linux-nvdimm, linux-kernel, mingo, linux-acpi, linux-api
Christoph Hellwig <hch@lst.de> writes:
> On Wed, Jun 10, 2015 at 02:46:16PM -0400, Matthew Wilcox wrote:
>> Don't screw up rw_page. The point of rw_page is to read or write a page
>> cache page. It can sleep, and it indicates success by using the page
>> flags. Don't try and scqueeze rw_bytes into it. If you want rw_bytes
>> to be a queue operation, that's one thing, but don't mess with rw_page.
>
> Oh, I forgot about the page manipulating nature. Yes, we'll need a different
> operation in this case.
I didn't see this addressed in the new patch set. I'm also concerned
about the layering, but I haven't put enough time into it to really make
a better suggestion. I really dislike the idea of yet another device
stacking model in the kernel and I'm worried the code will go in, and the
sysfs interface will end up as a "user abi" and we won't be able to
change it in the future.
Dan, have you made any progress on this, or do you have plans to?
Cheers,
Jeff
^ permalink raw reply [flat|nested] 47+ messages in thread
* Re: [PATCH v5 17/21] libnvdimm: infrastructure for btt devices
2015-06-17 16:47 ` Jeff Moyer
@ 2015-06-17 16:50 ` Dan Williams
2015-06-17 16:57 ` Jeff Moyer
0 siblings, 1 reply; 47+ messages in thread
From: Dan Williams @ 2015-06-17 16:50 UTC (permalink / raw)
To: Jeff Moyer
Cc: Christoph Hellwig, Matthew Wilcox, Jens Axboe, Stephen Rothwell,
Andrew Morton, Rafael J. Wysocki, Neil Brown, Greg KH,
linux-nvdimm, linux-kernel, Ingo Molnar, Linux ACPI, linux-api
On Wed, Jun 17, 2015 at 9:47 AM, Jeff Moyer <jmoyer@redhat.com> wrote:
> Christoph Hellwig <hch@lst.de> writes:
>
>> On Wed, Jun 10, 2015 at 02:46:16PM -0400, Matthew Wilcox wrote:
>>> Don't screw up rw_page. The point of rw_page is to read or write a page
>>> cache page. It can sleep, and it indicates success by using the page
>>> flags. Don't try and scqueeze rw_bytes into it. If you want rw_bytes
>>> to be a queue operation, that's one thing, but don't mess with rw_page.
>>
>> Oh, I forgot about the page manipulating nature. Yes, we'll need a different
>> operation in this case.
>
> I didn't see this addressed in the new patch set. I'm also concerned
> about the layering, but I haven't put enough time into it to really make
> a better suggestion. I really dislike the idea of yet another device
> stacking model in the kernel and I'm worried the code will go in, and the
> sysfs interface will end up as a "user abi" and we won't be able to
> change it in the future.
>
> Dan, have you made any progress on this, or do you have plans to?
? in v6 ->rw_bytes() moved from libnvdimm local hackery to a top-level
block device operation. Is that your concern or something else?
^ permalink raw reply [flat|nested] 47+ messages in thread
* Re: [PATCH v5 17/21] libnvdimm: infrastructure for btt devices
2015-06-17 16:50 ` Dan Williams
@ 2015-06-17 16:57 ` Jeff Moyer
2015-06-17 17:09 ` Dan Williams
0 siblings, 1 reply; 47+ messages in thread
From: Jeff Moyer @ 2015-06-17 16:57 UTC (permalink / raw)
To: Dan Williams
Cc: Christoph Hellwig, Matthew Wilcox, Jens Axboe, Stephen Rothwell,
Andrew Morton, Rafael J. Wysocki, Neil Brown, Greg KH,
linux-nvdimm, linux-kernel, Ingo Molnar, Linux ACPI, linux-api
Dan Williams <dan.j.williams@intel.com> writes:
> On Wed, Jun 17, 2015 at 9:47 AM, Jeff Moyer <jmoyer@redhat.com> wrote:
>> Christoph Hellwig <hch@lst.de> writes:
>>
>>> On Wed, Jun 10, 2015 at 02:46:16PM -0400, Matthew Wilcox wrote:
>>>> Don't screw up rw_page. The point of rw_page is to read or write a page
>>>> cache page. It can sleep, and it indicates success by using the page
>>>> flags. Don't try and scqueeze rw_bytes into it. If you want rw_bytes
>>>> to be a queue operation, that's one thing, but don't mess with rw_page.
>>>
>>> Oh, I forgot about the page manipulating nature. Yes, we'll need a different
>>> operation in this case.
>>
>> I didn't see this addressed in the new patch set. I'm also concerned
>> about the layering, but I haven't put enough time into it to really make
>> a better suggestion. I really dislike the idea of yet another device
>> stacking model in the kernel and I'm worried the code will go in, and the
>> sysfs interface will end up as a "user abi" and we won't be able to
>> change it in the future.
>>
>> Dan, have you made any progress on this, or do you have plans to?
>
> ? in v6 ->rw_bytes() moved from libnvdimm local hackery to a top-level
> block device operation. Is that your concern or something else?
Hmm, I guess I was conflating two things. I see now that you did move
the rw_bytes into the block device operations, that looks good. I'll
table my concerns over yet another stacking model until I can say
something intelligent about it.
Cheers,
Jeff
^ permalink raw reply [flat|nested] 47+ messages in thread
* Re: [PATCH v5 17/21] libnvdimm: infrastructure for btt devices
2015-06-17 16:57 ` Jeff Moyer
@ 2015-06-17 17:09 ` Dan Williams
0 siblings, 0 replies; 47+ messages in thread
From: Dan Williams @ 2015-06-17 17:09 UTC (permalink / raw)
To: Jeff Moyer
Cc: Christoph Hellwig, Matthew Wilcox, Jens Axboe, Stephen Rothwell,
Andrew Morton, Rafael J. Wysocki, Neil Brown, Greg KH,
linux-nvdimm, linux-kernel, Ingo Molnar, Linux ACPI, linux-api
On Wed, Jun 17, 2015 at 9:57 AM, Jeff Moyer <jmoyer@redhat.com> wrote:
> Dan Williams <dan.j.williams@intel.com> writes:
>
>> On Wed, Jun 17, 2015 at 9:47 AM, Jeff Moyer <jmoyer@redhat.com> wrote:
>>> Christoph Hellwig <hch@lst.de> writes:
>>>
>>>> On Wed, Jun 10, 2015 at 02:46:16PM -0400, Matthew Wilcox wrote:
>>>>> Don't screw up rw_page. The point of rw_page is to read or write a page
>>>>> cache page. It can sleep, and it indicates success by using the page
>>>>> flags. Don't try and scqueeze rw_bytes into it. If you want rw_bytes
>>>>> to be a queue operation, that's one thing, but don't mess with rw_page.
>>>>
>>>> Oh, I forgot about the page manipulating nature. Yes, we'll need a different
>>>> operation in this case.
>>>
>>> I didn't see this addressed in the new patch set. I'm also concerned
>>> about the layering, but I haven't put enough time into it to really make
>>> a better suggestion. I really dislike the idea of yet another device
>>> stacking model in the kernel and I'm worried the code will go in, and the
>>> sysfs interface will end up as a "user abi" and we won't be able to
>>> change it in the future.
>>>
>>> Dan, have you made any progress on this, or do you have plans to?
>>
>> ? in v6 ->rw_bytes() moved from libnvdimm local hackery to a top-level
>> block device operation. Is that your concern or something else?
>
> Hmm, I guess I was conflating two things. I see now that you did move
> the rw_bytes into the block device operations, that looks good. I'll
> table my concerns over yet another stacking model until I can say
> something intelligent about it.
MD and DM guys can jump in here if I mis-characterize, but I believe
the libnvdimm stacking model:
1/ is warranted because ->rw_bytes() is unique to nvdimm devices and
there are plans for other drivers btt-like drivers to stack on top, a
"struct page" driver is an example
2/ avoids the mistakes of the MD and DM stacking implementations by
having a device-model handle in existence *prior* to attaching a
backing device. MD requires the parent block device to be created
first which causes the implementation to jump through hoops trying to
determine when the MD device has lost its "last opener". DM's model
is mostly opaque to sysfs, it just pops into existence after a magic
sequence of ioctls+netlink.
It also solves the "autodetect" problem of needing to scan every block
device in the system, the scanning is asynchronous and contained to a
given nvdimm bus.
^ permalink raw reply [flat|nested] 47+ messages in thread
end of thread, other threads:[~2015-06-17 17:10 UTC | newest]
Thread overview: 47+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2015-06-02 0:14 [PATCH v5 00/21] libnvdimm: non-volatile memory devices Dan Williams
2015-06-02 0:14 ` [PATCH v5 01/21] e820, efi: add ACPI 6.0 persistent memory types Dan Williams
2015-06-02 0:14 ` [PATCH v5 02/21] libnvdimm, nfit: initial libnvdimm infrastructure and NFIT support Dan Williams
2015-06-03 14:57 ` Christoph Hellwig
2015-06-03 19:24 ` Williams, Dan J
2015-06-09 6:33 ` hch
2015-06-09 22:27 ` Dan Williams
2015-06-02 0:14 ` [PATCH v5 03/21] libnvdimm: control character device and libnvdimm bus sysfs attributes Dan Williams
2015-06-02 0:14 ` [PATCH v5 04/21] libnvdimm, nfit: dimm/memory-devices Dan Williams
2015-06-02 0:14 ` [PATCH v5 05/21] libnvdimm: control (ioctl) messages for libnvdimm bus and dimm devices Dan Williams
2015-06-09 6:34 ` Christoph Hellwig
2015-06-09 6:57 ` Dan Williams
2015-06-10 7:33 ` Christoph Hellwig
2015-06-02 0:14 ` [PATCH v5 06/21] libnvdimm, nvdimm: dimm driver and base libnvdimm device-driver infrastructure Dan Williams
2015-06-02 0:14 ` [PATCH v5 07/21] libnvdimm, nfit: regions (block-data-window, persistent memory, volatile memory) Dan Williams
2015-06-02 0:14 ` [PATCH v5 08/21] libnvdimm: support for legacy (non-aliasing) nvdimms Dan Williams
2015-06-02 0:14 ` [PATCH v5 09/21] libnvdimm, nd_pmem: add libnvdimm support to the pmem driver Dan Williams
2015-06-03 7:44 ` Christoph Hellwig
2015-06-03 19:31 ` Williams, Dan J
2015-06-09 6:36 ` hch
2015-06-02 0:15 ` [PATCH v5 10/21] pmem: Dynamically allocate partition numbers Dan Williams
2015-06-02 0:15 ` [PATCH v5 11/21] libnvdimm, nfit: add interleave-set state-tracking infrastructure Dan Williams
2015-06-02 0:15 ` [PATCH v5 12/21] libnvdimm: namespace indices: read and validate Dan Williams
2015-06-09 6:39 ` Christoph Hellwig
2015-06-10 15:54 ` Dan Williams
2015-06-02 0:15 ` [PATCH v5 13/21] libnvdimm: pmem label sets and namespace instantiation Dan Williams
2015-06-02 0:15 ` [PATCH v5 14/21] libnvdimm: blk labels " Dan Williams
2015-06-02 0:15 ` [PATCH v5 15/21] libnvdimm: write pmem label set Dan Williams
2015-06-02 0:15 ` [PATCH v5 16/21] libnvdimm: write blk " Dan Williams
2015-06-02 0:15 ` [PATCH v5 17/21] libnvdimm: infrastructure for btt devices Dan Williams
2015-06-09 6:42 ` Christoph Hellwig
2015-06-10 18:46 ` Matthew Wilcox
2015-06-11 7:28 ` Christoph Hellwig
2015-06-17 16:47 ` Jeff Moyer
2015-06-17 16:50 ` Dan Williams
2015-06-17 16:57 ` Jeff Moyer
2015-06-17 17:09 ` Dan Williams
2015-06-02 0:15 ` [PATCH v5 18/21] nd_btt: atomic sector updates Dan Williams
2015-06-09 6:44 ` Christoph Hellwig
2015-06-09 18:27 ` Vishal Verma
2015-06-10 7:34 ` Christoph Hellwig
2015-06-10 18:24 ` Vishal Verma
2015-06-02 0:15 ` [PATCH v5 19/21] libnvdimm, nfit, nd_blk: driver for BLK-mode access persistent memory Dan Williams
2015-06-02 0:15 ` [PATCH v5 20/21] tools/testing/nvdimm: manufactured NFITs for interface development Dan Williams
2015-06-09 6:48 ` Christoph Hellwig
2015-06-11 20:12 ` Dan Williams
2015-06-02 0:16 ` [PATCH v5 21/21] libnvdimm: Non-Volatile Devices Dan Williams
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