* [PATCH 01/15] dma-direct: use is_swiotlb_active in dma_direct_map_page
2022-04-04 5:05 cleanup swiotlb initialization v8 Christoph Hellwig
@ 2022-04-04 5:05 ` Christoph Hellwig
2022-04-04 5:05 ` [PATCH 02/15] swiotlb: make swiotlb_exit a no-op if SWIOTLB_FORCE is set Christoph Hellwig
` (17 subsequent siblings)
18 siblings, 0 replies; 31+ messages in thread
From: Christoph Hellwig @ 2022-04-04 5:05 UTC (permalink / raw)
To: iommu
Cc: x86, Anshuman Khandual, Tom Lendacky, Konrad Rzeszutek Wilk,
Stefano Stabellini, Boris Ostrovsky, Juergen Gross, Joerg Roedel,
David Woodhouse, Lu Baolu, Robin Murphy, linux-arm-kernel,
xen-devel, linux-ia64, linux-mips, linuxppc-dev, linux-riscv,
linux-s390, linux-hyperv, tboot-devel, linux-pci
Use the more specific is_swiotlb_active check instead of checking the
global swiotlb_force variable.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
---
kernel/dma/direct.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/dma/direct.h b/kernel/dma/direct.h
index 4632b0f4f72eb..4dc16e08c7e1a 100644
--- a/kernel/dma/direct.h
+++ b/kernel/dma/direct.h
@@ -91,7 +91,7 @@ static inline dma_addr_t dma_direct_map_page(struct device *dev,
return swiotlb_map(dev, phys, size, dir, attrs);
if (unlikely(!dma_capable(dev, dma_addr, size, true))) {
- if (swiotlb_force != SWIOTLB_NO_FORCE)
+ if (is_swiotlb_active(dev))
return swiotlb_map(dev, phys, size, dir, attrs);
dev_WARN_ONCE(dev, 1,
--
2.30.2
^ permalink raw reply related [flat|nested] 31+ messages in thread* [PATCH 02/15] swiotlb: make swiotlb_exit a no-op if SWIOTLB_FORCE is set
2022-04-04 5:05 cleanup swiotlb initialization v8 Christoph Hellwig
2022-04-04 5:05 ` [PATCH 01/15] dma-direct: use is_swiotlb_active in dma_direct_map_page Christoph Hellwig
@ 2022-04-04 5:05 ` Christoph Hellwig
2022-04-04 5:05 ` [PATCH 03/15] swiotlb: simplify swiotlb_max_segment Christoph Hellwig
` (16 subsequent siblings)
18 siblings, 0 replies; 31+ messages in thread
From: Christoph Hellwig @ 2022-04-04 5:05 UTC (permalink / raw)
To: iommu
Cc: x86, Anshuman Khandual, Tom Lendacky, Konrad Rzeszutek Wilk,
Stefano Stabellini, Boris Ostrovsky, Juergen Gross, Joerg Roedel,
David Woodhouse, Lu Baolu, Robin Murphy, linux-arm-kernel,
xen-devel, linux-ia64, linux-mips, linuxppc-dev, linux-riscv,
linux-s390, linux-hyperv, tboot-devel, linux-pci
If force bouncing is enabled we can't release the buffers.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
---
kernel/dma/swiotlb.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c
index 73a41cec9e386..98bb0eb44a7bf 100644
--- a/kernel/dma/swiotlb.c
+++ b/kernel/dma/swiotlb.c
@@ -369,6 +369,9 @@ void __init swiotlb_exit(void)
unsigned long tbl_vaddr;
size_t tbl_size, slots_size;
+ if (swiotlb_force == SWIOTLB_FORCE)
+ return;
+
if (!mem->nslabs)
return;
--
2.30.2
^ permalink raw reply related [flat|nested] 31+ messages in thread* [PATCH 03/15] swiotlb: simplify swiotlb_max_segment
2022-04-04 5:05 cleanup swiotlb initialization v8 Christoph Hellwig
2022-04-04 5:05 ` [PATCH 01/15] dma-direct: use is_swiotlb_active in dma_direct_map_page Christoph Hellwig
2022-04-04 5:05 ` [PATCH 02/15] swiotlb: make swiotlb_exit a no-op if SWIOTLB_FORCE is set Christoph Hellwig
@ 2022-04-04 5:05 ` Christoph Hellwig
2022-04-04 5:05 ` [PATCH 04/15] swiotlb: rename swiotlb_late_init_with_default_size Christoph Hellwig
` (15 subsequent siblings)
18 siblings, 0 replies; 31+ messages in thread
From: Christoph Hellwig @ 2022-04-04 5:05 UTC (permalink / raw)
To: iommu
Cc: x86, Anshuman Khandual, Tom Lendacky, Konrad Rzeszutek Wilk,
Stefano Stabellini, Boris Ostrovsky, Juergen Gross, Joerg Roedel,
David Woodhouse, Lu Baolu, Robin Murphy, linux-arm-kernel,
xen-devel, linux-ia64, linux-mips, linuxppc-dev, linux-riscv,
linux-s390, linux-hyperv, tboot-devel, linux-pci
Remove the bogus Xen override that was usually larger than the actual
size and just calculate the value on demand. Note that
swiotlb_max_segment still doesn't make sense as an interface and should
eventually be removed.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
---
drivers/xen/swiotlb-xen.c | 2 --
include/linux/swiotlb.h | 1 -
kernel/dma/swiotlb.c | 20 +++-----------------
3 files changed, 3 insertions(+), 20 deletions(-)
diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c
index 47aebd98f52f5..485cd06ed39e7 100644
--- a/drivers/xen/swiotlb-xen.c
+++ b/drivers/xen/swiotlb-xen.c
@@ -202,7 +202,6 @@ int xen_swiotlb_init(void)
rc = swiotlb_late_init_with_tbl(start, nslabs);
if (rc)
return rc;
- swiotlb_set_max_segment(PAGE_SIZE);
return 0;
error:
if (nslabs > 1024 && repeat--) {
@@ -254,7 +253,6 @@ void __init xen_swiotlb_init_early(void)
if (swiotlb_init_with_tbl(start, nslabs, true))
panic("Cannot allocate SWIOTLB buffer");
- swiotlb_set_max_segment(PAGE_SIZE);
}
#endif /* CONFIG_X86 */
diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h
index f6c3638255d54..9fb3a568f0c51 100644
--- a/include/linux/swiotlb.h
+++ b/include/linux/swiotlb.h
@@ -164,7 +164,6 @@ static inline void swiotlb_adjust_size(unsigned long size)
#endif /* CONFIG_SWIOTLB */
extern void swiotlb_print_info(void);
-extern void swiotlb_set_max_segment(unsigned int);
#ifdef CONFIG_DMA_RESTRICTED_POOL
struct page *swiotlb_alloc(struct device *dev, size_t size);
diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c
index 98bb0eb44a7bf..e0127e397335e 100644
--- a/kernel/dma/swiotlb.c
+++ b/kernel/dma/swiotlb.c
@@ -68,12 +68,6 @@ struct io_tlb_mem io_tlb_default_mem;
phys_addr_t swiotlb_unencrypted_base;
-/*
- * Max segment that we can provide which (if pages are contingous) will
- * not be bounced (unless SWIOTLB_FORCE is set).
- */
-static unsigned int max_segment;
-
static unsigned long default_nslabs = IO_TLB_DEFAULT_SIZE >> IO_TLB_SHIFT;
static int __init
@@ -97,18 +91,12 @@ early_param("swiotlb", setup_io_tlb_npages);
unsigned int swiotlb_max_segment(void)
{
- return io_tlb_default_mem.nslabs ? max_segment : 0;
+ if (!io_tlb_default_mem.nslabs)
+ return 0;
+ return rounddown(io_tlb_default_mem.nslabs << IO_TLB_SHIFT, PAGE_SIZE);
}
EXPORT_SYMBOL_GPL(swiotlb_max_segment);
-void swiotlb_set_max_segment(unsigned int val)
-{
- if (swiotlb_force == SWIOTLB_FORCE)
- max_segment = 1;
- else
- max_segment = rounddown(val, PAGE_SIZE);
-}
-
unsigned long swiotlb_size_or_default(void)
{
return default_nslabs << IO_TLB_SHIFT;
@@ -258,7 +246,6 @@ int __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose)
if (verbose)
swiotlb_print_info();
- swiotlb_set_max_segment(mem->nslabs << IO_TLB_SHIFT);
return 0;
}
@@ -359,7 +346,6 @@ swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs)
swiotlb_init_io_tlb_mem(mem, virt_to_phys(tlb), nslabs, true);
swiotlb_print_info();
- swiotlb_set_max_segment(mem->nslabs << IO_TLB_SHIFT);
return 0;
}
--
2.30.2
^ permalink raw reply related [flat|nested] 31+ messages in thread* [PATCH 04/15] swiotlb: rename swiotlb_late_init_with_default_size
2022-04-04 5:05 cleanup swiotlb initialization v8 Christoph Hellwig
` (2 preceding siblings ...)
2022-04-04 5:05 ` [PATCH 03/15] swiotlb: simplify swiotlb_max_segment Christoph Hellwig
@ 2022-04-04 5:05 ` Christoph Hellwig
2022-04-04 5:05 ` [PATCH 05/15] arm/xen: don't check for xen_initial_domain() in xen_create_contiguous_region Christoph Hellwig
` (14 subsequent siblings)
18 siblings, 0 replies; 31+ messages in thread
From: Christoph Hellwig @ 2022-04-04 5:05 UTC (permalink / raw)
To: iommu
Cc: x86, Anshuman Khandual, Tom Lendacky, Konrad Rzeszutek Wilk,
Stefano Stabellini, Boris Ostrovsky, Juergen Gross, Joerg Roedel,
David Woodhouse, Lu Baolu, Robin Murphy, linux-arm-kernel,
xen-devel, linux-ia64, linux-mips, linuxppc-dev, linux-riscv,
linux-s390, linux-hyperv, tboot-devel, linux-pci
swiotlb_late_init_with_default_size is an overly verbose name that
doesn't even catch what the function is doing, given that the size is
not just a default but the actual requested size.
Rename it to swiotlb_init_late.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
---
arch/x86/pci/sta2x11-fixup.c | 2 +-
include/linux/swiotlb.h | 2 +-
kernel/dma/swiotlb.c | 6 ++----
3 files changed, 4 insertions(+), 6 deletions(-)
diff --git a/arch/x86/pci/sta2x11-fixup.c b/arch/x86/pci/sta2x11-fixup.c
index 101081ad64b6d..e0c039a75b2db 100644
--- a/arch/x86/pci/sta2x11-fixup.c
+++ b/arch/x86/pci/sta2x11-fixup.c
@@ -57,7 +57,7 @@ static void sta2x11_new_instance(struct pci_dev *pdev)
int size = STA2X11_SWIOTLB_SIZE;
/* First instance: register your own swiotlb area */
dev_info(&pdev->dev, "Using SWIOTLB (size %i)\n", size);
- if (swiotlb_late_init_with_default_size(size))
+ if (swiotlb_init_late(size))
dev_emerg(&pdev->dev, "init swiotlb failed\n");
}
list_add(&instance->list, &sta2x11_instance_list);
diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h
index 9fb3a568f0c51..b48b26bfa0edb 100644
--- a/include/linux/swiotlb.h
+++ b/include/linux/swiotlb.h
@@ -40,7 +40,7 @@ extern void swiotlb_init(int verbose);
int swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose);
unsigned long swiotlb_size_or_default(void);
extern int swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs);
-extern int swiotlb_late_init_with_default_size(size_t default_size);
+int swiotlb_init_late(size_t size);
extern void __init swiotlb_update_mem_attributes(void);
phys_addr_t swiotlb_tbl_map_single(struct device *hwdev, phys_addr_t phys,
diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c
index e0127e397335e..9a4fe6e48a074 100644
--- a/kernel/dma/swiotlb.c
+++ b/kernel/dma/swiotlb.c
@@ -281,11 +281,9 @@ swiotlb_init(int verbose)
* initialize the swiotlb later using the slab allocator if needed.
* This should be just like above, but with some error catching.
*/
-int
-swiotlb_late_init_with_default_size(size_t default_size)
+int swiotlb_init_late(size_t size)
{
- unsigned long nslabs =
- ALIGN(default_size >> IO_TLB_SHIFT, IO_TLB_SEGSIZE);
+ unsigned long nslabs = ALIGN(size >> IO_TLB_SHIFT, IO_TLB_SEGSIZE);
unsigned long bytes;
unsigned char *vstart = NULL;
unsigned int order;
--
2.30.2
^ permalink raw reply related [flat|nested] 31+ messages in thread* [PATCH 05/15] arm/xen: don't check for xen_initial_domain() in xen_create_contiguous_region
2022-04-04 5:05 cleanup swiotlb initialization v8 Christoph Hellwig
` (3 preceding siblings ...)
2022-04-04 5:05 ` [PATCH 04/15] swiotlb: rename swiotlb_late_init_with_default_size Christoph Hellwig
@ 2022-04-04 5:05 ` Christoph Hellwig
2022-04-04 5:05 ` [PATCH 06/15] MIPS/octeon: use swiotlb_init instead of open coding it Christoph Hellwig
` (13 subsequent siblings)
18 siblings, 0 replies; 31+ messages in thread
From: Christoph Hellwig @ 2022-04-04 5:05 UTC (permalink / raw)
To: iommu
Cc: x86, Anshuman Khandual, Tom Lendacky, Konrad Rzeszutek Wilk,
Stefano Stabellini, Boris Ostrovsky, Juergen Gross, Joerg Roedel,
David Woodhouse, Lu Baolu, Robin Murphy, linux-arm-kernel,
xen-devel, linux-ia64, linux-mips, linuxppc-dev, linux-riscv,
linux-s390, linux-hyperv, tboot-devel, linux-pci,
Stefano Stabellini
From: Stefano Stabellini <sstabellini@kernel.org>
It used to be that Linux enabled swiotlb-xen when running a dom0 on ARM.
Since f5079a9a2a31 "xen/arm: introduce XENFEAT_direct_mapped and
XENFEAT_not_direct_mapped", Linux detects whether to enable or disable
swiotlb-xen based on the new feature flags: XENFEAT_direct_mapped and
XENFEAT_not_direct_mapped.
However, there is still a leftover xen_initial_domain() check in
xen_create_contiguous_region. Remove the check as
xen_create_contiguous_region is only called by swiotlb-xen during
initialization. If xen_create_contiguous_region is called, we know Linux
is running 1:1 mapped so there is no need for additional checks.
Also update the in-code comment.
Signed-off-by: Stefano Stabellini <stefano.stabellini@xilinx.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
arch/arm/xen/mm.c | 5 +----
1 file changed, 1 insertion(+), 4 deletions(-)
diff --git a/arch/arm/xen/mm.c b/arch/arm/xen/mm.c
index a7e54a087b802..28c2070602535 100644
--- a/arch/arm/xen/mm.c
+++ b/arch/arm/xen/mm.c
@@ -122,10 +122,7 @@ int xen_create_contiguous_region(phys_addr_t pstart, unsigned int order,
unsigned int address_bits,
dma_addr_t *dma_handle)
{
- if (!xen_initial_domain())
- return -EINVAL;
-
- /* we assume that dom0 is mapped 1:1 for now */
+ /* the domain is 1:1 mapped to use swiotlb-xen */
*dma_handle = pstart;
return 0;
}
--
2.30.2
^ permalink raw reply related [flat|nested] 31+ messages in thread* [PATCH 06/15] MIPS/octeon: use swiotlb_init instead of open coding it
2022-04-04 5:05 cleanup swiotlb initialization v8 Christoph Hellwig
` (4 preceding siblings ...)
2022-04-04 5:05 ` [PATCH 05/15] arm/xen: don't check for xen_initial_domain() in xen_create_contiguous_region Christoph Hellwig
@ 2022-04-04 5:05 ` Christoph Hellwig
2022-04-04 5:05 ` [PATCH 07/15] x86: remove the IOMMU table infrastructure Christoph Hellwig
` (12 subsequent siblings)
18 siblings, 0 replies; 31+ messages in thread
From: Christoph Hellwig @ 2022-04-04 5:05 UTC (permalink / raw)
To: iommu
Cc: x86, Anshuman Khandual, Tom Lendacky, Konrad Rzeszutek Wilk,
Stefano Stabellini, Boris Ostrovsky, Juergen Gross, Joerg Roedel,
David Woodhouse, Lu Baolu, Robin Murphy, linux-arm-kernel,
xen-devel, linux-ia64, linux-mips, linuxppc-dev, linux-riscv,
linux-s390, linux-hyperv, tboot-devel, linux-pci,
Thomas Bogendoerfer
Use the generic swiotlb initialization helper instead of open coding it.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
---
arch/mips/cavium-octeon/dma-octeon.c | 15 ++-------------
arch/mips/pci/pci-octeon.c | 2 +-
2 files changed, 3 insertions(+), 14 deletions(-)
diff --git a/arch/mips/cavium-octeon/dma-octeon.c b/arch/mips/cavium-octeon/dma-octeon.c
index df70308db0e69..fb7547e217263 100644
--- a/arch/mips/cavium-octeon/dma-octeon.c
+++ b/arch/mips/cavium-octeon/dma-octeon.c
@@ -186,15 +186,12 @@ phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
return daddr;
}
-char *octeon_swiotlb;
-
void __init plat_swiotlb_setup(void)
{
phys_addr_t start, end;
phys_addr_t max_addr;
phys_addr_t addr_size;
size_t swiotlbsize;
- unsigned long swiotlb_nslabs;
u64 i;
max_addr = 0;
@@ -236,15 +233,7 @@ void __init plat_swiotlb_setup(void)
if (OCTEON_IS_OCTEON2() && max_addr >= 0x100000000ul)
swiotlbsize = 64 * (1<<20);
#endif
- swiotlb_nslabs = swiotlbsize >> IO_TLB_SHIFT;
- swiotlb_nslabs = ALIGN(swiotlb_nslabs, IO_TLB_SEGSIZE);
- swiotlbsize = swiotlb_nslabs << IO_TLB_SHIFT;
-
- octeon_swiotlb = memblock_alloc_low(swiotlbsize, PAGE_SIZE);
- if (!octeon_swiotlb)
- panic("%s: Failed to allocate %zu bytes align=%lx\n",
- __func__, swiotlbsize, PAGE_SIZE);
- if (swiotlb_init_with_tbl(octeon_swiotlb, swiotlb_nslabs, 1) == -ENOMEM)
- panic("Cannot allocate SWIOTLB buffer");
+ swiotlb_adjust_size(swiotlbsize);
+ swiotlb_init(1);
}
diff --git a/arch/mips/pci/pci-octeon.c b/arch/mips/pci/pci-octeon.c
index fc29b85cfa926..e457a18cbdc59 100644
--- a/arch/mips/pci/pci-octeon.c
+++ b/arch/mips/pci/pci-octeon.c
@@ -664,7 +664,7 @@ static int __init octeon_pci_setup(void)
/* BAR1 movable regions contiguous to cover the swiotlb */
octeon_bar1_pci_phys =
- virt_to_phys(octeon_swiotlb) & ~((1ull << 22) - 1);
+ io_tlb_default_mem.start & ~((1ull << 22) - 1);
for (index = 0; index < 32; index++) {
union cvmx_pci_bar1_indexx bar1_index;
--
2.30.2
^ permalink raw reply related [flat|nested] 31+ messages in thread* [PATCH 07/15] x86: remove the IOMMU table infrastructure
2022-04-04 5:05 cleanup swiotlb initialization v8 Christoph Hellwig
` (5 preceding siblings ...)
2022-04-04 5:05 ` [PATCH 06/15] MIPS/octeon: use swiotlb_init instead of open coding it Christoph Hellwig
@ 2022-04-04 5:05 ` Christoph Hellwig
2022-04-07 0:20 ` Konrad Rzeszutek Wilk
2022-04-04 5:05 ` [PATCH 08/15] x86: centralize setting SWIOTLB_FORCE when guest memory encryption is enabled Christoph Hellwig
` (11 subsequent siblings)
18 siblings, 1 reply; 31+ messages in thread
From: Christoph Hellwig @ 2022-04-04 5:05 UTC (permalink / raw)
To: iommu
Cc: x86, Anshuman Khandual, Tom Lendacky, Konrad Rzeszutek Wilk,
Stefano Stabellini, Boris Ostrovsky, Juergen Gross, Joerg Roedel,
David Woodhouse, Lu Baolu, Robin Murphy, linux-arm-kernel,
xen-devel, linux-ia64, linux-mips, linuxppc-dev, linux-riscv,
linux-s390, linux-hyperv, tboot-devel, linux-pci
The IOMMU table tries to separate the different IOMMUs into different
backends, but actually requires various cross calls.
Rewrite the code to do the generic swiotlb/swiotlb-xen setup directly
in pci-dma.c and then just call into the IOMMU drivers.
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
arch/ia64/include/asm/iommu_table.h | 7 --
arch/x86/include/asm/dma-mapping.h | 1 -
arch/x86/include/asm/gart.h | 5 +-
arch/x86/include/asm/iommu.h | 6 ++
arch/x86/include/asm/iommu_table.h | 102 -----------------------
arch/x86/include/asm/swiotlb.h | 30 -------
arch/x86/include/asm/xen/swiotlb-xen.h | 2 -
arch/x86/kernel/Makefile | 2 -
arch/x86/kernel/amd_gart_64.c | 5 +-
arch/x86/kernel/aperture_64.c | 14 ++--
arch/x86/kernel/pci-dma.c | 107 ++++++++++++++++++++-----
arch/x86/kernel/pci-iommu_table.c | 77 ------------------
arch/x86/kernel/pci-swiotlb.c | 77 ------------------
arch/x86/kernel/tboot.c | 1 -
arch/x86/kernel/vmlinux.lds.S | 12 ---
arch/x86/xen/Makefile | 2 -
arch/x86/xen/pci-swiotlb-xen.c | 96 ----------------------
drivers/iommu/amd/init.c | 6 --
drivers/iommu/amd/iommu.c | 5 +-
drivers/iommu/intel/dmar.c | 6 +-
include/linux/dmar.h | 6 +-
21 files changed, 110 insertions(+), 459 deletions(-)
delete mode 100644 arch/ia64/include/asm/iommu_table.h
delete mode 100644 arch/x86/include/asm/iommu_table.h
delete mode 100644 arch/x86/include/asm/swiotlb.h
delete mode 100644 arch/x86/kernel/pci-iommu_table.c
delete mode 100644 arch/x86/kernel/pci-swiotlb.c
delete mode 100644 arch/x86/xen/pci-swiotlb-xen.c
diff --git a/arch/ia64/include/asm/iommu_table.h b/arch/ia64/include/asm/iommu_table.h
deleted file mode 100644
index cc96116ac276a..0000000000000
--- a/arch/ia64/include/asm/iommu_table.h
+++ /dev/null
@@ -1,7 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _ASM_IA64_IOMMU_TABLE_H
-#define _ASM_IA64_IOMMU_TABLE_H
-
-#define IOMMU_INIT_POST(_detect)
-
-#endif /* _ASM_IA64_IOMMU_TABLE_H */
diff --git a/arch/x86/include/asm/dma-mapping.h b/arch/x86/include/asm/dma-mapping.h
index bb1654fe0ce74..256fd8115223d 100644
--- a/arch/x86/include/asm/dma-mapping.h
+++ b/arch/x86/include/asm/dma-mapping.h
@@ -9,7 +9,6 @@
#include <linux/scatterlist.h>
#include <asm/io.h>
-#include <asm/swiotlb.h>
extern int iommu_merge;
extern int panic_on_overflow;
diff --git a/arch/x86/include/asm/gart.h b/arch/x86/include/asm/gart.h
index 3185565743459..5af8088a10df6 100644
--- a/arch/x86/include/asm/gart.h
+++ b/arch/x86/include/asm/gart.h
@@ -38,7 +38,7 @@ extern int gart_iommu_aperture_disabled;
extern void early_gart_iommu_check(void);
extern int gart_iommu_init(void);
extern void __init gart_parse_options(char *);
-extern int gart_iommu_hole_init(void);
+void gart_iommu_hole_init(void);
#else
#define gart_iommu_aperture 0
@@ -51,9 +51,8 @@ static inline void early_gart_iommu_check(void)
static inline void gart_parse_options(char *options)
{
}
-static inline int gart_iommu_hole_init(void)
+static inline void gart_iommu_hole_init(void)
{
- return -ENODEV;
}
#endif
diff --git a/arch/x86/include/asm/iommu.h b/arch/x86/include/asm/iommu.h
index bf1ed2ddc74bd..dba89ed40d38d 100644
--- a/arch/x86/include/asm/iommu.h
+++ b/arch/x86/include/asm/iommu.h
@@ -9,6 +9,12 @@
extern int force_iommu, no_iommu;
extern int iommu_detected;
+#ifdef CONFIG_SWIOTLB
+extern bool x86_swiotlb_enable;
+#else
+#define x86_swiotlb_enable false
+#endif
+
/* 10 seconds */
#define DMAR_OPERATION_TIMEOUT ((cycles_t) tsc_khz*10*1000)
diff --git a/arch/x86/include/asm/iommu_table.h b/arch/x86/include/asm/iommu_table.h
deleted file mode 100644
index 1fb3fd1a83c25..0000000000000
--- a/arch/x86/include/asm/iommu_table.h
+++ /dev/null
@@ -1,102 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _ASM_X86_IOMMU_TABLE_H
-#define _ASM_X86_IOMMU_TABLE_H
-
-#include <asm/swiotlb.h>
-
-/*
- * History lesson:
- * The execution chain of IOMMUs in 2.6.36 looks as so:
- *
- * [xen-swiotlb]
- * |
- * +----[swiotlb *]--+
- * / | \
- * / | \
- * [GART] [Calgary] [Intel VT-d]
- * /
- * /
- * [AMD-Vi]
- *
- * *: if SWIOTLB detected 'iommu=soft'/'swiotlb=force' it would skip
- * over the rest of IOMMUs and unconditionally initialize the SWIOTLB.
- * Also it would surreptitiously initialize set the swiotlb=1 if there were
- * more than 4GB and if the user did not pass in 'iommu=off'. The swiotlb
- * flag would be turned off by all IOMMUs except the Calgary one.
- *
- * The IOMMU_INIT* macros allow a similar tree (or more complex if desired)
- * to be built by defining who we depend on.
- *
- * And all that needs to be done is to use one of the macros in the IOMMU
- * and the pci-dma.c will take care of the rest.
- */
-
-struct iommu_table_entry {
- initcall_t detect;
- initcall_t depend;
- void (*early_init)(void); /* No memory allocate available. */
- void (*late_init)(void); /* Yes, can allocate memory. */
-#define IOMMU_FINISH_IF_DETECTED (1<<0)
-#define IOMMU_DETECTED (1<<1)
- int flags;
-};
-/*
- * Macro fills out an entry in the .iommu_table that is equivalent
- * to the fields that 'struct iommu_table_entry' has. The entries
- * that are put in the .iommu_table section are not put in any order
- * hence during boot-time we will have to resort them based on
- * dependency. */
-
-
-#define __IOMMU_INIT(_detect, _depend, _early_init, _late_init, _finish)\
- static const struct iommu_table_entry \
- __iommu_entry_##_detect __used \
- __attribute__ ((unused, __section__(".iommu_table"), \
- aligned((sizeof(void *))))) \
- = {_detect, _depend, _early_init, _late_init, \
- _finish ? IOMMU_FINISH_IF_DETECTED : 0}
-/*
- * The simplest IOMMU definition. Provide the detection routine
- * and it will be run after the SWIOTLB and the other IOMMUs
- * that utilize this macro. If the IOMMU is detected (ie, the
- * detect routine returns a positive value), the other IOMMUs
- * are also checked. You can use IOMMU_INIT_POST_FINISH if you prefer
- * to stop detecting the other IOMMUs after yours has been detected.
- */
-#define IOMMU_INIT_POST(_detect) \
- __IOMMU_INIT(_detect, pci_swiotlb_detect_4gb, NULL, NULL, 0)
-
-#define IOMMU_INIT_POST_FINISH(detect) \
- __IOMMU_INIT(_detect, pci_swiotlb_detect_4gb, NULL, NULL, 1)
-
-/*
- * A more sophisticated version of IOMMU_INIT. This variant requires:
- * a). A detection routine function.
- * b). The name of the detection routine we depend on to get called
- * before us.
- * c). The init routine which gets called if the detection routine
- * returns a positive value from the pci_iommu_alloc. This means
- * no presence of a memory allocator.
- * d). Similar to the 'init', except that this gets called from pci_iommu_init
- * where we do have a memory allocator.
- *
- * The standard IOMMU_INIT differs from the IOMMU_INIT_FINISH variant
- * in that the former will continue detecting other IOMMUs in the call
- * list after the detection routine returns a positive number, while the
- * latter will stop the execution chain upon first successful detection.
- * Both variants will still call the 'init' and 'late_init' functions if
- * they are set.
- */
-#define IOMMU_INIT_FINISH(_detect, _depend, _init, _late_init) \
- __IOMMU_INIT(_detect, _depend, _init, _late_init, 1)
-
-#define IOMMU_INIT(_detect, _depend, _init, _late_init) \
- __IOMMU_INIT(_detect, _depend, _init, _late_init, 0)
-
-void sort_iommu_table(struct iommu_table_entry *start,
- struct iommu_table_entry *finish);
-
-void check_iommu_entries(struct iommu_table_entry *start,
- struct iommu_table_entry *finish);
-
-#endif /* _ASM_X86_IOMMU_TABLE_H */
diff --git a/arch/x86/include/asm/swiotlb.h b/arch/x86/include/asm/swiotlb.h
deleted file mode 100644
index ff6c92eff035a..0000000000000
--- a/arch/x86/include/asm/swiotlb.h
+++ /dev/null
@@ -1,30 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _ASM_X86_SWIOTLB_H
-#define _ASM_X86_SWIOTLB_H
-
-#include <linux/swiotlb.h>
-
-#ifdef CONFIG_SWIOTLB
-extern int swiotlb;
-extern int __init pci_swiotlb_detect_override(void);
-extern int __init pci_swiotlb_detect_4gb(void);
-extern void __init pci_swiotlb_init(void);
-extern void __init pci_swiotlb_late_init(void);
-#else
-#define swiotlb 0
-static inline int pci_swiotlb_detect_override(void)
-{
- return 0;
-}
-static inline int pci_swiotlb_detect_4gb(void)
-{
- return 0;
-}
-static inline void pci_swiotlb_init(void)
-{
-}
-static inline void pci_swiotlb_late_init(void)
-{
-}
-#endif
-#endif /* _ASM_X86_SWIOTLB_H */
diff --git a/arch/x86/include/asm/xen/swiotlb-xen.h b/arch/x86/include/asm/xen/swiotlb-xen.h
index 66b4ddde77430..e5a90b42e4dde 100644
--- a/arch/x86/include/asm/xen/swiotlb-xen.h
+++ b/arch/x86/include/asm/xen/swiotlb-xen.h
@@ -3,10 +3,8 @@
#define _ASM_X86_SWIOTLB_XEN_H
#ifdef CONFIG_SWIOTLB_XEN
-extern int __init pci_xen_swiotlb_detect(void);
extern int pci_xen_swiotlb_init_late(void);
#else
-#define pci_xen_swiotlb_detect NULL
static inline int pci_xen_swiotlb_init_late(void) { return -ENXIO; }
#endif
diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile
index c41ef42adbe8a..e17b7e92a3fa3 100644
--- a/arch/x86/kernel/Makefile
+++ b/arch/x86/kernel/Makefile
@@ -68,7 +68,6 @@ obj-y += bootflag.o e820.o
obj-y += pci-dma.o quirks.o topology.o kdebugfs.o
obj-y += alternative.o i8253.o hw_breakpoint.o
obj-y += tsc.o tsc_msr.o io_delay.o rtc.o
-obj-y += pci-iommu_table.o
obj-y += resource.o
obj-y += irqflags.o
obj-y += static_call.o
@@ -134,7 +133,6 @@ obj-$(CONFIG_PCSPKR_PLATFORM) += pcspeaker.o
obj-$(CONFIG_X86_CHECK_BIOS_CORRUPTION) += check.o
-obj-$(CONFIG_SWIOTLB) += pci-swiotlb.o
obj-$(CONFIG_OF) += devicetree.o
obj-$(CONFIG_UPROBES) += uprobes.o
diff --git a/arch/x86/kernel/amd_gart_64.c b/arch/x86/kernel/amd_gart_64.c
index ed837383de5c8..194d54eed5376 100644
--- a/arch/x86/kernel/amd_gart_64.c
+++ b/arch/x86/kernel/amd_gart_64.c
@@ -38,11 +38,9 @@
#include <asm/iommu.h>
#include <asm/gart.h>
#include <asm/set_memory.h>
-#include <asm/swiotlb.h>
#include <asm/dma.h>
#include <asm/amd_nb.h>
#include <asm/x86_init.h>
-#include <asm/iommu_table.h>
static unsigned long iommu_bus_base; /* GART remapping area (physical) */
static unsigned long iommu_size; /* size of remapping area bytes */
@@ -808,7 +806,7 @@ int __init gart_iommu_init(void)
flush_gart();
dma_ops = &gart_dma_ops;
x86_platform.iommu_shutdown = gart_iommu_shutdown;
- swiotlb = 0;
+ x86_swiotlb_enable = false;
return 0;
}
@@ -842,4 +840,3 @@ void __init gart_parse_options(char *p)
}
}
}
-IOMMU_INIT_POST(gart_iommu_hole_init);
diff --git a/arch/x86/kernel/aperture_64.c b/arch/x86/kernel/aperture_64.c
index af3ba08b684b5..7a5630d904b23 100644
--- a/arch/x86/kernel/aperture_64.c
+++ b/arch/x86/kernel/aperture_64.c
@@ -392,7 +392,7 @@ void __init early_gart_iommu_check(void)
static int __initdata printed_gart_size_msg;
-int __init gart_iommu_hole_init(void)
+void __init gart_iommu_hole_init(void)
{
u32 agp_aper_base = 0, agp_aper_order = 0;
u32 aper_size, aper_alloc = 0, aper_order = 0, last_aper_order = 0;
@@ -401,11 +401,11 @@ int __init gart_iommu_hole_init(void)
int i, node;
if (!amd_gart_present())
- return -ENODEV;
+ return;
if (gart_iommu_aperture_disabled || !fix_aperture ||
!early_pci_allowed())
- return -ENODEV;
+ return;
pr_info("Checking aperture...\n");
@@ -491,10 +491,8 @@ int __init gart_iommu_hole_init(void)
* and fixed up the northbridge
*/
exclude_from_core(last_aper_base, last_aper_order);
-
- return 1;
}
- return 0;
+ return;
}
if (!fallback_aper_force) {
@@ -527,7 +525,7 @@ int __init gart_iommu_hole_init(void)
panic("Not enough memory for aperture");
}
} else {
- return 0;
+ return;
}
/*
@@ -561,6 +559,4 @@ int __init gart_iommu_hole_init(void)
}
set_up_gart_resume(aper_order, aper_alloc);
-
- return 1;
}
diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c
index de234e7a8962e..df96926421be0 100644
--- a/arch/x86/kernel/pci-dma.c
+++ b/arch/x86/kernel/pci-dma.c
@@ -7,13 +7,16 @@
#include <linux/memblock.h>
#include <linux/gfp.h>
#include <linux/pci.h>
+#include <linux/amd-iommu.h>
#include <asm/proto.h>
#include <asm/dma.h>
#include <asm/iommu.h>
#include <asm/gart.h>
#include <asm/x86_init.h>
-#include <asm/iommu_table.h>
+
+#include <xen/xen.h>
+#include <xen/swiotlb-xen.h>
static bool disable_dac_quirk __read_mostly;
@@ -34,24 +37,83 @@ int no_iommu __read_mostly;
/* Set this to 1 if there is a HW IOMMU in the system */
int iommu_detected __read_mostly = 0;
-extern struct iommu_table_entry __iommu_table[], __iommu_table_end[];
+#ifdef CONFIG_SWIOTLB
+bool x86_swiotlb_enable;
+
+static void __init pci_swiotlb_detect(void)
+{
+ /* don't initialize swiotlb if iommu=off (no_iommu=1) */
+ if (!no_iommu && max_possible_pfn > MAX_DMA32_PFN)
+ x86_swiotlb_enable = true;
+
+ /*
+ * Set swiotlb to 1 so that bounce buffers are allocated and used for
+ * devices that can't support DMA to encrypted memory.
+ */
+ if (cc_platform_has(CC_ATTR_HOST_MEM_ENCRYPT))
+ x86_swiotlb_enable = true;
+
+ if (swiotlb_force == SWIOTLB_FORCE)
+ x86_swiotlb_enable = true;
+}
+#else
+static inline void __init pci_swiotlb_detect(void)
+{
+}
+#endif /* CONFIG_SWIOTLB */
+
+#ifdef CONFIG_SWIOTLB_XEN
+static bool xen_swiotlb;
+
+static void __init pci_xen_swiotlb_init(void)
+{
+ if (!xen_initial_domain() && !x86_swiotlb_enable &&
+ swiotlb_force != SWIOTLB_FORCE)
+ return;
+ x86_swiotlb_enable = true;
+ xen_swiotlb = true;
+ xen_swiotlb_init_early();
+ dma_ops = &xen_swiotlb_dma_ops;
+ if (IS_ENABLED(CONFIG_PCI))
+ pci_request_acs();
+}
+
+int pci_xen_swiotlb_init_late(void)
+{
+ int rc;
+
+ if (xen_swiotlb)
+ return 0;
+
+ rc = xen_swiotlb_init();
+ if (rc)
+ return rc;
+
+ /* XXX: this switches the dma ops under live devices! */
+ dma_ops = &xen_swiotlb_dma_ops;
+ if (IS_ENABLED(CONFIG_PCI))
+ pci_request_acs();
+ return 0;
+}
+EXPORT_SYMBOL_GPL(pci_xen_swiotlb_init_late);
+#else
+static inline void __init pci_xen_swiotlb_init(void)
+{
+}
+#endif /* CONFIG_SWIOTLB_XEN */
void __init pci_iommu_alloc(void)
{
- struct iommu_table_entry *p;
-
- sort_iommu_table(__iommu_table, __iommu_table_end);
- check_iommu_entries(__iommu_table, __iommu_table_end);
-
- for (p = __iommu_table; p < __iommu_table_end; p++) {
- if (p && p->detect && p->detect() > 0) {
- p->flags |= IOMMU_DETECTED;
- if (p->early_init)
- p->early_init();
- if (p->flags & IOMMU_FINISH_IF_DETECTED)
- break;
- }
+ if (xen_pv_domain()) {
+ pci_xen_swiotlb_init();
+ return;
}
+ pci_swiotlb_detect();
+ gart_iommu_hole_init();
+ amd_iommu_detect();
+ detect_intel_iommu();
+ if (x86_swiotlb_enable)
+ swiotlb_init(0);
}
/*
@@ -102,7 +164,7 @@ static __init int iommu_setup(char *p)
}
#ifdef CONFIG_SWIOTLB
if (!strncmp(p, "soft", 4))
- swiotlb = 1;
+ x86_swiotlb_enable = true;
#endif
if (!strncmp(p, "pt", 2))
iommu_set_default_passthrough(true);
@@ -121,14 +183,17 @@ early_param("iommu", iommu_setup);
static int __init pci_iommu_init(void)
{
- struct iommu_table_entry *p;
-
x86_init.iommu.iommu_init();
- for (p = __iommu_table; p < __iommu_table_end; p++) {
- if (p && (p->flags & IOMMU_DETECTED) && p->late_init)
- p->late_init();
+#ifdef CONFIG_SWIOTLB
+ /* An IOMMU turned us off. */
+ if (x86_swiotlb_enable) {
+ pr_info("PCI-DMA: Using software bounce buffering for IO (SWIOTLB)\n");
+ swiotlb_print_info();
+ } else {
+ swiotlb_exit();
}
+#endif
return 0;
}
diff --git a/arch/x86/kernel/pci-iommu_table.c b/arch/x86/kernel/pci-iommu_table.c
deleted file mode 100644
index 42e92ec62973b..0000000000000
--- a/arch/x86/kernel/pci-iommu_table.c
+++ /dev/null
@@ -1,77 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-#include <linux/dma-mapping.h>
-#include <asm/iommu_table.h>
-#include <linux/string.h>
-#include <linux/kallsyms.h>
-
-static struct iommu_table_entry * __init
-find_dependents_of(struct iommu_table_entry *start,
- struct iommu_table_entry *finish,
- struct iommu_table_entry *q)
-{
- struct iommu_table_entry *p;
-
- if (!q)
- return NULL;
-
- for (p = start; p < finish; p++)
- if (p->detect == q->depend)
- return p;
-
- return NULL;
-}
-
-
-void __init sort_iommu_table(struct iommu_table_entry *start,
- struct iommu_table_entry *finish) {
-
- struct iommu_table_entry *p, *q, tmp;
-
- for (p = start; p < finish; p++) {
-again:
- q = find_dependents_of(start, finish, p);
- /* We are bit sneaky here. We use the memory address to figure
- * out if the node we depend on is past our point, if so, swap.
- */
- if (q > p) {
- tmp = *p;
- memmove(p, q, sizeof(*p));
- *q = tmp;
- goto again;
- }
- }
-
-}
-
-#ifdef DEBUG
-void __init check_iommu_entries(struct iommu_table_entry *start,
- struct iommu_table_entry *finish)
-{
- struct iommu_table_entry *p, *q, *x;
-
- /* Simple cyclic dependency checker. */
- for (p = start; p < finish; p++) {
- q = find_dependents_of(start, finish, p);
- x = find_dependents_of(start, finish, q);
- if (p == x) {
- printk(KERN_ERR "CYCLIC DEPENDENCY FOUND! %pS depends on %pS and vice-versa. BREAKING IT.\n",
- p->detect, q->detect);
- /* Heavy handed way..*/
- x->depend = NULL;
- }
- }
-
- for (p = start; p < finish; p++) {
- q = find_dependents_of(p, finish, p);
- if (q && q > p) {
- printk(KERN_ERR "EXECUTION ORDER INVALID! %pS should be called before %pS!\n",
- p->detect, q->detect);
- }
- }
-}
-#else
-void __init check_iommu_entries(struct iommu_table_entry *start,
- struct iommu_table_entry *finish)
-{
-}
-#endif
diff --git a/arch/x86/kernel/pci-swiotlb.c b/arch/x86/kernel/pci-swiotlb.c
deleted file mode 100644
index 814ab46a0dada..0000000000000
--- a/arch/x86/kernel/pci-swiotlb.c
+++ /dev/null
@@ -1,77 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-
-#include <linux/pci.h>
-#include <linux/cache.h>
-#include <linux/init.h>
-#include <linux/swiotlb.h>
-#include <linux/memblock.h>
-#include <linux/dma-direct.h>
-#include <linux/cc_platform.h>
-
-#include <asm/iommu.h>
-#include <asm/swiotlb.h>
-#include <asm/dma.h>
-#include <asm/xen/swiotlb-xen.h>
-#include <asm/iommu_table.h>
-
-int swiotlb __read_mostly;
-
-/*
- * pci_swiotlb_detect_override - set swiotlb to 1 if necessary
- *
- * This returns non-zero if we are forced to use swiotlb (by the boot
- * option).
- */
-int __init pci_swiotlb_detect_override(void)
-{
- if (swiotlb_force == SWIOTLB_FORCE)
- swiotlb = 1;
-
- return swiotlb;
-}
-IOMMU_INIT_FINISH(pci_swiotlb_detect_override,
- pci_xen_swiotlb_detect,
- pci_swiotlb_init,
- pci_swiotlb_late_init);
-
-/*
- * If 4GB or more detected (and iommu=off not set) or if SME is active
- * then set swiotlb to 1 and return 1.
- */
-int __init pci_swiotlb_detect_4gb(void)
-{
- /* don't initialize swiotlb if iommu=off (no_iommu=1) */
- if (!no_iommu && max_possible_pfn > MAX_DMA32_PFN)
- swiotlb = 1;
-
- /*
- * Set swiotlb to 1 so that bounce buffers are allocated and used for
- * devices that can't support DMA to encrypted memory.
- */
- if (cc_platform_has(CC_ATTR_HOST_MEM_ENCRYPT))
- swiotlb = 1;
-
- return swiotlb;
-}
-IOMMU_INIT(pci_swiotlb_detect_4gb,
- pci_swiotlb_detect_override,
- pci_swiotlb_init,
- pci_swiotlb_late_init);
-
-void __init pci_swiotlb_init(void)
-{
- if (swiotlb)
- swiotlb_init(0);
-}
-
-void __init pci_swiotlb_late_init(void)
-{
- /* An IOMMU turned us off. */
- if (!swiotlb)
- swiotlb_exit();
- else {
- printk(KERN_INFO "PCI-DMA: "
- "Using software bounce buffering for IO (SWIOTLB)\n");
- swiotlb_print_info();
- }
-}
diff --git a/arch/x86/kernel/tboot.c b/arch/x86/kernel/tboot.c
index f9af561c3cd4f..0c1154a1c4032 100644
--- a/arch/x86/kernel/tboot.c
+++ b/arch/x86/kernel/tboot.c
@@ -24,7 +24,6 @@
#include <asm/processor.h>
#include <asm/bootparam.h>
#include <asm/pgalloc.h>
-#include <asm/swiotlb.h>
#include <asm/fixmap.h>
#include <asm/proto.h>
#include <asm/setup.h>
diff --git a/arch/x86/kernel/vmlinux.lds.S b/arch/x86/kernel/vmlinux.lds.S
index 7fda7f27e7620..f5f6dc2e80072 100644
--- a/arch/x86/kernel/vmlinux.lds.S
+++ b/arch/x86/kernel/vmlinux.lds.S
@@ -315,18 +315,6 @@ SECTIONS
*(.altinstr_replacement)
}
- /*
- * struct iommu_table_entry entries are injected in this section.
- * It is an array of IOMMUs which during run time gets sorted depending
- * on its dependency order. After rootfs_initcall is complete
- * this section can be safely removed.
- */
- .iommu_table : AT(ADDR(.iommu_table) - LOAD_OFFSET) {
- __iommu_table = .;
- *(.iommu_table)
- __iommu_table_end = .;
- }
-
. = ALIGN(8);
.apicdrivers : AT(ADDR(.apicdrivers) - LOAD_OFFSET) {
__apicdrivers = .;
diff --git a/arch/x86/xen/Makefile b/arch/x86/xen/Makefile
index 4953260e281c3..3c5b52fbe4a7f 100644
--- a/arch/x86/xen/Makefile
+++ b/arch/x86/xen/Makefile
@@ -47,6 +47,4 @@ obj-$(CONFIG_XEN_DEBUG_FS) += debugfs.o
obj-$(CONFIG_XEN_PV_DOM0) += vga.o
-obj-$(CONFIG_SWIOTLB_XEN) += pci-swiotlb-xen.o
-
obj-$(CONFIG_XEN_EFI) += efi.o
diff --git a/arch/x86/xen/pci-swiotlb-xen.c b/arch/x86/xen/pci-swiotlb-xen.c
deleted file mode 100644
index 46df59aeaa06a..0000000000000
--- a/arch/x86/xen/pci-swiotlb-xen.c
+++ /dev/null
@@ -1,96 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-
-/* Glue code to lib/swiotlb-xen.c */
-
-#include <linux/dma-map-ops.h>
-#include <linux/pci.h>
-#include <xen/swiotlb-xen.h>
-
-#include <asm/xen/hypervisor.h>
-#include <xen/xen.h>
-#include <asm/iommu_table.h>
-
-
-#include <asm/xen/swiotlb-xen.h>
-#ifdef CONFIG_X86_64
-#include <asm/iommu.h>
-#include <asm/dma.h>
-#endif
-#include <linux/export.h>
-
-static int xen_swiotlb __read_mostly;
-
-/*
- * pci_xen_swiotlb_detect - set xen_swiotlb to 1 if necessary
- *
- * This returns non-zero if we are forced to use xen_swiotlb (by the boot
- * option).
- */
-int __init pci_xen_swiotlb_detect(void)
-{
-
- if (!xen_pv_domain())
- return 0;
-
- /* If running as PV guest, either iommu=soft, or swiotlb=force will
- * activate this IOMMU. If running as PV privileged, activate it
- * irregardless.
- */
- if (xen_initial_domain() || swiotlb || swiotlb_force == SWIOTLB_FORCE)
- xen_swiotlb = 1;
-
- /* If we are running under Xen, we MUST disable the native SWIOTLB.
- * Don't worry about swiotlb_force flag activating the native, as
- * the 'swiotlb' flag is the only one turning it on. */
- swiotlb = 0;
-
-#ifdef CONFIG_X86_64
- /* pci_swiotlb_detect_4gb turns on native SWIOTLB if no_iommu == 0
- * (so no iommu=X command line over-writes).
- * Considering that PV guests do not want the *native SWIOTLB* but
- * only Xen SWIOTLB it is not useful to us so set no_iommu=1 here.
- */
- if (max_pfn > MAX_DMA32_PFN)
- no_iommu = 1;
-#endif
- return xen_swiotlb;
-}
-
-static void __init pci_xen_swiotlb_init(void)
-{
- if (xen_swiotlb) {
- xen_swiotlb_init_early();
- dma_ops = &xen_swiotlb_dma_ops;
-
-#ifdef CONFIG_PCI
- /* Make sure ACS will be enabled */
- pci_request_acs();
-#endif
- }
-}
-
-int pci_xen_swiotlb_init_late(void)
-{
- int rc;
-
- if (xen_swiotlb)
- return 0;
-
- rc = xen_swiotlb_init();
- if (rc)
- return rc;
-
- dma_ops = &xen_swiotlb_dma_ops;
-#ifdef CONFIG_PCI
- /* Make sure ACS will be enabled */
- pci_request_acs();
-#endif
-
- return 0;
-}
-EXPORT_SYMBOL_GPL(pci_xen_swiotlb_init_late);
-
-IOMMU_INIT_FINISH(pci_xen_swiotlb_detect,
- NULL,
- pci_xen_swiotlb_init,
- NULL);
diff --git a/drivers/iommu/amd/init.c b/drivers/iommu/amd/init.c
index b4a798c7b347f..1a3ad58ba8465 100644
--- a/drivers/iommu/amd/init.c
+++ b/drivers/iommu/amd/init.c
@@ -27,7 +27,6 @@
#include <asm/apic.h>
#include <asm/gart.h>
#include <asm/x86_init.h>
-#include <asm/iommu_table.h>
#include <asm/io_apic.h>
#include <asm/irq_remapping.h>
#include <asm/set_memory.h>
@@ -3257,11 +3256,6 @@ __setup("ivrs_ioapic", parse_ivrs_ioapic);
__setup("ivrs_hpet", parse_ivrs_hpet);
__setup("ivrs_acpihid", parse_ivrs_acpihid);
-IOMMU_INIT_FINISH(amd_iommu_detect,
- gart_iommu_hole_init,
- NULL,
- NULL);
-
bool amd_iommu_v2_supported(void)
{
return amd_iommu_v2_present;
diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c
index a1ada7bff44e6..b47220ac09eaa 100644
--- a/drivers/iommu/amd/iommu.c
+++ b/drivers/iommu/amd/iommu.c
@@ -1840,7 +1840,10 @@ void amd_iommu_domain_update(struct protection_domain *domain)
static void __init amd_iommu_init_dma_ops(void)
{
- swiotlb = (iommu_default_passthrough() || sme_me_mask) ? 1 : 0;
+ if (iommu_default_passthrough() || sme_me_mask)
+ x86_swiotlb_enable = true;
+ else
+ x86_swiotlb_enable = false;
}
int __init amd_iommu_init_api(void)
diff --git a/drivers/iommu/intel/dmar.c b/drivers/iommu/intel/dmar.c
index 4de960834a1b2..592c1e1a5d4b9 100644
--- a/drivers/iommu/intel/dmar.c
+++ b/drivers/iommu/intel/dmar.c
@@ -30,7 +30,6 @@
#include <linux/numa.h>
#include <linux/limits.h>
#include <asm/irq_remapping.h>
-#include <asm/iommu_table.h>
#include <trace/events/intel_iommu.h>
#include "../irq_remapping.h"
@@ -912,7 +911,7 @@ dmar_validate_one_drhd(struct acpi_dmar_header *entry, void *arg)
return 0;
}
-int __init detect_intel_iommu(void)
+void __init detect_intel_iommu(void)
{
int ret;
struct dmar_res_callback validate_drhd_cb = {
@@ -945,8 +944,6 @@ int __init detect_intel_iommu(void)
dmar_tbl = NULL;
}
up_write(&dmar_global_lock);
-
- return ret ? ret : 1;
}
static void unmap_iommu(struct intel_iommu *iommu)
@@ -2164,7 +2161,6 @@ static int __init dmar_free_unused_resources(void)
}
late_initcall(dmar_free_unused_resources);
-IOMMU_INIT_POST(detect_intel_iommu);
/*
* DMAR Hotplug Support
diff --git a/include/linux/dmar.h b/include/linux/dmar.h
index 45e903d847335..cbd714a198a0a 100644
--- a/include/linux/dmar.h
+++ b/include/linux/dmar.h
@@ -121,7 +121,7 @@ extern int dmar_remove_dev_scope(struct dmar_pci_notify_info *info,
u16 segment, struct dmar_dev_scope *devices,
int count);
/* Intel IOMMU detection */
-extern int detect_intel_iommu(void);
+void detect_intel_iommu(void);
extern int enable_drhd_fault_handling(void);
extern int dmar_device_add(acpi_handle handle);
extern int dmar_device_remove(acpi_handle handle);
@@ -197,6 +197,10 @@ static inline bool dmar_platform_optin(void)
return false;
}
+static inline void detect_intel_iommu(void)
+{
+}
+
#endif /* CONFIG_DMAR_TABLE */
struct irte {
--
2.30.2
^ permalink raw reply related [flat|nested] 31+ messages in thread* Re: [PATCH 07/15] x86: remove the IOMMU table infrastructure
2022-04-04 5:05 ` [PATCH 07/15] x86: remove the IOMMU table infrastructure Christoph Hellwig
@ 2022-04-07 0:20 ` Konrad Rzeszutek Wilk
0 siblings, 0 replies; 31+ messages in thread
From: Konrad Rzeszutek Wilk @ 2022-04-07 0:20 UTC (permalink / raw)
To: Christoph Hellwig
Cc: iommu, x86, Anshuman Khandual, Tom Lendacky, Stefano Stabellini,
Boris Ostrovsky, Juergen Gross, Joerg Roedel, David Woodhouse,
Lu Baolu, Robin Murphy, linux-arm-kernel, xen-devel, linux-ia64,
linux-mips, linuxppc-dev, linux-riscv, linux-s390, linux-hyperv,
tboot-devel, linux-pci
On Mon, Apr 04, 2022 at 07:05:51AM +0200, Christoph Hellwig wrote:
> The IOMMU table tries to separate the different IOMMUs into different
> backends, but actually requires various cross calls.
>
> Rewrite the code to do the generic swiotlb/swiotlb-xen setup directly
> in pci-dma.c and then just call into the IOMMU drivers.
>
> Signed-off-by: Christoph Hellwig <hch@lst.de>
Hey Christoph,
There is a bit of background behind this - this whole IOMMU table
dynamic was done as at that point of time the pci_iommu_alloc was getting
way to unwieldy - and there needed to be a more 'structured' way with
dependencies.
Hence this creation... But as Christoph points out - it has gotten out
of hand. So smashing it back to a more simplistic mechanism is good.
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Thank you!
> ---
> arch/ia64/include/asm/iommu_table.h | 7 --
> arch/x86/include/asm/dma-mapping.h | 1 -
> arch/x86/include/asm/gart.h | 5 +-
> arch/x86/include/asm/iommu.h | 6 ++
> arch/x86/include/asm/iommu_table.h | 102 -----------------------
> arch/x86/include/asm/swiotlb.h | 30 -------
> arch/x86/include/asm/xen/swiotlb-xen.h | 2 -
> arch/x86/kernel/Makefile | 2 -
> arch/x86/kernel/amd_gart_64.c | 5 +-
> arch/x86/kernel/aperture_64.c | 14 ++--
> arch/x86/kernel/pci-dma.c | 107 ++++++++++++++++++++-----
> arch/x86/kernel/pci-iommu_table.c | 77 ------------------
> arch/x86/kernel/pci-swiotlb.c | 77 ------------------
> arch/x86/kernel/tboot.c | 1 -
> arch/x86/kernel/vmlinux.lds.S | 12 ---
> arch/x86/xen/Makefile | 2 -
> arch/x86/xen/pci-swiotlb-xen.c | 96 ----------------------
> drivers/iommu/amd/init.c | 6 --
> drivers/iommu/amd/iommu.c | 5 +-
> drivers/iommu/intel/dmar.c | 6 +-
> include/linux/dmar.h | 6 +-
> 21 files changed, 110 insertions(+), 459 deletions(-)
> delete mode 100644 arch/ia64/include/asm/iommu_table.h
> delete mode 100644 arch/x86/include/asm/iommu_table.h
> delete mode 100644 arch/x86/include/asm/swiotlb.h
> delete mode 100644 arch/x86/kernel/pci-iommu_table.c
> delete mode 100644 arch/x86/kernel/pci-swiotlb.c
> delete mode 100644 arch/x86/xen/pci-swiotlb-xen.c
>
> diff --git a/arch/ia64/include/asm/iommu_table.h b/arch/ia64/include/asm/iommu_table.h
> deleted file mode 100644
> index cc96116ac276a..0000000000000
> --- a/arch/ia64/include/asm/iommu_table.h
> +++ /dev/null
> @@ -1,7 +0,0 @@
> -/* SPDX-License-Identifier: GPL-2.0 */
> -#ifndef _ASM_IA64_IOMMU_TABLE_H
> -#define _ASM_IA64_IOMMU_TABLE_H
> -
> -#define IOMMU_INIT_POST(_detect)
> -
> -#endif /* _ASM_IA64_IOMMU_TABLE_H */
> diff --git a/arch/x86/include/asm/dma-mapping.h b/arch/x86/include/asm/dma-mapping.h
> index bb1654fe0ce74..256fd8115223d 100644
> --- a/arch/x86/include/asm/dma-mapping.h
> +++ b/arch/x86/include/asm/dma-mapping.h
> @@ -9,7 +9,6 @@
>
> #include <linux/scatterlist.h>
> #include <asm/io.h>
> -#include <asm/swiotlb.h>
>
> extern int iommu_merge;
> extern int panic_on_overflow;
> diff --git a/arch/x86/include/asm/gart.h b/arch/x86/include/asm/gart.h
> index 3185565743459..5af8088a10df6 100644
> --- a/arch/x86/include/asm/gart.h
> +++ b/arch/x86/include/asm/gart.h
> @@ -38,7 +38,7 @@ extern int gart_iommu_aperture_disabled;
> extern void early_gart_iommu_check(void);
> extern int gart_iommu_init(void);
> extern void __init gart_parse_options(char *);
> -extern int gart_iommu_hole_init(void);
> +void gart_iommu_hole_init(void);
>
> #else
> #define gart_iommu_aperture 0
> @@ -51,9 +51,8 @@ static inline void early_gart_iommu_check(void)
> static inline void gart_parse_options(char *options)
> {
> }
> -static inline int gart_iommu_hole_init(void)
> +static inline void gart_iommu_hole_init(void)
> {
> - return -ENODEV;
> }
> #endif
>
> diff --git a/arch/x86/include/asm/iommu.h b/arch/x86/include/asm/iommu.h
> index bf1ed2ddc74bd..dba89ed40d38d 100644
> --- a/arch/x86/include/asm/iommu.h
> +++ b/arch/x86/include/asm/iommu.h
> @@ -9,6 +9,12 @@
> extern int force_iommu, no_iommu;
> extern int iommu_detected;
>
> +#ifdef CONFIG_SWIOTLB
> +extern bool x86_swiotlb_enable;
> +#else
> +#define x86_swiotlb_enable false
> +#endif
> +
> /* 10 seconds */
> #define DMAR_OPERATION_TIMEOUT ((cycles_t) tsc_khz*10*1000)
>
> diff --git a/arch/x86/include/asm/iommu_table.h b/arch/x86/include/asm/iommu_table.h
> deleted file mode 100644
> index 1fb3fd1a83c25..0000000000000
> --- a/arch/x86/include/asm/iommu_table.h
> +++ /dev/null
> @@ -1,102 +0,0 @@
> -/* SPDX-License-Identifier: GPL-2.0 */
> -#ifndef _ASM_X86_IOMMU_TABLE_H
> -#define _ASM_X86_IOMMU_TABLE_H
> -
> -#include <asm/swiotlb.h>
> -
> -/*
> - * History lesson:
> - * The execution chain of IOMMUs in 2.6.36 looks as so:
> - *
> - * [xen-swiotlb]
> - * |
> - * +----[swiotlb *]--+
> - * / | \
> - * / | \
> - * [GART] [Calgary] [Intel VT-d]
> - * /
> - * /
> - * [AMD-Vi]
> - *
> - * *: if SWIOTLB detected 'iommu=soft'/'swiotlb=force' it would skip
> - * over the rest of IOMMUs and unconditionally initialize the SWIOTLB.
> - * Also it would surreptitiously initialize set the swiotlb=1 if there were
> - * more than 4GB and if the user did not pass in 'iommu=off'. The swiotlb
> - * flag would be turned off by all IOMMUs except the Calgary one.
> - *
> - * The IOMMU_INIT* macros allow a similar tree (or more complex if desired)
> - * to be built by defining who we depend on.
> - *
> - * And all that needs to be done is to use one of the macros in the IOMMU
> - * and the pci-dma.c will take care of the rest.
> - */
> -
> -struct iommu_table_entry {
> - initcall_t detect;
> - initcall_t depend;
> - void (*early_init)(void); /* No memory allocate available. */
> - void (*late_init)(void); /* Yes, can allocate memory. */
> -#define IOMMU_FINISH_IF_DETECTED (1<<0)
> -#define IOMMU_DETECTED (1<<1)
> - int flags;
> -};
> -/*
> - * Macro fills out an entry in the .iommu_table that is equivalent
> - * to the fields that 'struct iommu_table_entry' has. The entries
> - * that are put in the .iommu_table section are not put in any order
> - * hence during boot-time we will have to resort them based on
> - * dependency. */
> -
> -
> -#define __IOMMU_INIT(_detect, _depend, _early_init, _late_init, _finish)\
> - static const struct iommu_table_entry \
> - __iommu_entry_##_detect __used \
> - __attribute__ ((unused, __section__(".iommu_table"), \
> - aligned((sizeof(void *))))) \
> - = {_detect, _depend, _early_init, _late_init, \
> - _finish ? IOMMU_FINISH_IF_DETECTED : 0}
> -/*
> - * The simplest IOMMU definition. Provide the detection routine
> - * and it will be run after the SWIOTLB and the other IOMMUs
> - * that utilize this macro. If the IOMMU is detected (ie, the
> - * detect routine returns a positive value), the other IOMMUs
> - * are also checked. You can use IOMMU_INIT_POST_FINISH if you prefer
> - * to stop detecting the other IOMMUs after yours has been detected.
> - */
> -#define IOMMU_INIT_POST(_detect) \
> - __IOMMU_INIT(_detect, pci_swiotlb_detect_4gb, NULL, NULL, 0)
> -
> -#define IOMMU_INIT_POST_FINISH(detect) \
> - __IOMMU_INIT(_detect, pci_swiotlb_detect_4gb, NULL, NULL, 1)
> -
> -/*
> - * A more sophisticated version of IOMMU_INIT. This variant requires:
> - * a). A detection routine function.
> - * b). The name of the detection routine we depend on to get called
> - * before us.
> - * c). The init routine which gets called if the detection routine
> - * returns a positive value from the pci_iommu_alloc. This means
> - * no presence of a memory allocator.
> - * d). Similar to the 'init', except that this gets called from pci_iommu_init
> - * where we do have a memory allocator.
> - *
> - * The standard IOMMU_INIT differs from the IOMMU_INIT_FINISH variant
> - * in that the former will continue detecting other IOMMUs in the call
> - * list after the detection routine returns a positive number, while the
> - * latter will stop the execution chain upon first successful detection.
> - * Both variants will still call the 'init' and 'late_init' functions if
> - * they are set.
> - */
> -#define IOMMU_INIT_FINISH(_detect, _depend, _init, _late_init) \
> - __IOMMU_INIT(_detect, _depend, _init, _late_init, 1)
> -
> -#define IOMMU_INIT(_detect, _depend, _init, _late_init) \
> - __IOMMU_INIT(_detect, _depend, _init, _late_init, 0)
> -
> -void sort_iommu_table(struct iommu_table_entry *start,
> - struct iommu_table_entry *finish);
> -
> -void check_iommu_entries(struct iommu_table_entry *start,
> - struct iommu_table_entry *finish);
> -
> -#endif /* _ASM_X86_IOMMU_TABLE_H */
> diff --git a/arch/x86/include/asm/swiotlb.h b/arch/x86/include/asm/swiotlb.h
> deleted file mode 100644
> index ff6c92eff035a..0000000000000
> --- a/arch/x86/include/asm/swiotlb.h
> +++ /dev/null
> @@ -1,30 +0,0 @@
> -/* SPDX-License-Identifier: GPL-2.0 */
> -#ifndef _ASM_X86_SWIOTLB_H
> -#define _ASM_X86_SWIOTLB_H
> -
> -#include <linux/swiotlb.h>
> -
> -#ifdef CONFIG_SWIOTLB
> -extern int swiotlb;
> -extern int __init pci_swiotlb_detect_override(void);
> -extern int __init pci_swiotlb_detect_4gb(void);
> -extern void __init pci_swiotlb_init(void);
> -extern void __init pci_swiotlb_late_init(void);
> -#else
> -#define swiotlb 0
> -static inline int pci_swiotlb_detect_override(void)
> -{
> - return 0;
> -}
> -static inline int pci_swiotlb_detect_4gb(void)
> -{
> - return 0;
> -}
> -static inline void pci_swiotlb_init(void)
> -{
> -}
> -static inline void pci_swiotlb_late_init(void)
> -{
> -}
> -#endif
> -#endif /* _ASM_X86_SWIOTLB_H */
> diff --git a/arch/x86/include/asm/xen/swiotlb-xen.h b/arch/x86/include/asm/xen/swiotlb-xen.h
> index 66b4ddde77430..e5a90b42e4dde 100644
> --- a/arch/x86/include/asm/xen/swiotlb-xen.h
> +++ b/arch/x86/include/asm/xen/swiotlb-xen.h
> @@ -3,10 +3,8 @@
> #define _ASM_X86_SWIOTLB_XEN_H
>
> #ifdef CONFIG_SWIOTLB_XEN
> -extern int __init pci_xen_swiotlb_detect(void);
> extern int pci_xen_swiotlb_init_late(void);
> #else
> -#define pci_xen_swiotlb_detect NULL
> static inline int pci_xen_swiotlb_init_late(void) { return -ENXIO; }
> #endif
>
> diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile
> index c41ef42adbe8a..e17b7e92a3fa3 100644
> --- a/arch/x86/kernel/Makefile
> +++ b/arch/x86/kernel/Makefile
> @@ -68,7 +68,6 @@ obj-y += bootflag.o e820.o
> obj-y += pci-dma.o quirks.o topology.o kdebugfs.o
> obj-y += alternative.o i8253.o hw_breakpoint.o
> obj-y += tsc.o tsc_msr.o io_delay.o rtc.o
> -obj-y += pci-iommu_table.o
> obj-y += resource.o
> obj-y += irqflags.o
> obj-y += static_call.o
> @@ -134,7 +133,6 @@ obj-$(CONFIG_PCSPKR_PLATFORM) += pcspeaker.o
>
> obj-$(CONFIG_X86_CHECK_BIOS_CORRUPTION) += check.o
>
> -obj-$(CONFIG_SWIOTLB) += pci-swiotlb.o
> obj-$(CONFIG_OF) += devicetree.o
> obj-$(CONFIG_UPROBES) += uprobes.o
>
> diff --git a/arch/x86/kernel/amd_gart_64.c b/arch/x86/kernel/amd_gart_64.c
> index ed837383de5c8..194d54eed5376 100644
> --- a/arch/x86/kernel/amd_gart_64.c
> +++ b/arch/x86/kernel/amd_gart_64.c
> @@ -38,11 +38,9 @@
> #include <asm/iommu.h>
> #include <asm/gart.h>
> #include <asm/set_memory.h>
> -#include <asm/swiotlb.h>
> #include <asm/dma.h>
> #include <asm/amd_nb.h>
> #include <asm/x86_init.h>
> -#include <asm/iommu_table.h>
>
> static unsigned long iommu_bus_base; /* GART remapping area (physical) */
> static unsigned long iommu_size; /* size of remapping area bytes */
> @@ -808,7 +806,7 @@ int __init gart_iommu_init(void)
> flush_gart();
> dma_ops = &gart_dma_ops;
> x86_platform.iommu_shutdown = gart_iommu_shutdown;
> - swiotlb = 0;
> + x86_swiotlb_enable = false;
>
> return 0;
> }
> @@ -842,4 +840,3 @@ void __init gart_parse_options(char *p)
> }
> }
> }
> -IOMMU_INIT_POST(gart_iommu_hole_init);
> diff --git a/arch/x86/kernel/aperture_64.c b/arch/x86/kernel/aperture_64.c
> index af3ba08b684b5..7a5630d904b23 100644
> --- a/arch/x86/kernel/aperture_64.c
> +++ b/arch/x86/kernel/aperture_64.c
> @@ -392,7 +392,7 @@ void __init early_gart_iommu_check(void)
>
> static int __initdata printed_gart_size_msg;
>
> -int __init gart_iommu_hole_init(void)
> +void __init gart_iommu_hole_init(void)
> {
> u32 agp_aper_base = 0, agp_aper_order = 0;
> u32 aper_size, aper_alloc = 0, aper_order = 0, last_aper_order = 0;
> @@ -401,11 +401,11 @@ int __init gart_iommu_hole_init(void)
> int i, node;
>
> if (!amd_gart_present())
> - return -ENODEV;
> + return;
>
> if (gart_iommu_aperture_disabled || !fix_aperture ||
> !early_pci_allowed())
> - return -ENODEV;
> + return;
>
> pr_info("Checking aperture...\n");
>
> @@ -491,10 +491,8 @@ int __init gart_iommu_hole_init(void)
> * and fixed up the northbridge
> */
> exclude_from_core(last_aper_base, last_aper_order);
> -
> - return 1;
> }
> - return 0;
> + return;
> }
>
> if (!fallback_aper_force) {
> @@ -527,7 +525,7 @@ int __init gart_iommu_hole_init(void)
> panic("Not enough memory for aperture");
> }
> } else {
> - return 0;
> + return;
> }
>
> /*
> @@ -561,6 +559,4 @@ int __init gart_iommu_hole_init(void)
> }
>
> set_up_gart_resume(aper_order, aper_alloc);
> -
> - return 1;
> }
> diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c
> index de234e7a8962e..df96926421be0 100644
> --- a/arch/x86/kernel/pci-dma.c
> +++ b/arch/x86/kernel/pci-dma.c
> @@ -7,13 +7,16 @@
> #include <linux/memblock.h>
> #include <linux/gfp.h>
> #include <linux/pci.h>
> +#include <linux/amd-iommu.h>
>
> #include <asm/proto.h>
> #include <asm/dma.h>
> #include <asm/iommu.h>
> #include <asm/gart.h>
> #include <asm/x86_init.h>
> -#include <asm/iommu_table.h>
> +
> +#include <xen/xen.h>
> +#include <xen/swiotlb-xen.h>
>
> static bool disable_dac_quirk __read_mostly;
>
> @@ -34,24 +37,83 @@ int no_iommu __read_mostly;
> /* Set this to 1 if there is a HW IOMMU in the system */
> int iommu_detected __read_mostly = 0;
>
> -extern struct iommu_table_entry __iommu_table[], __iommu_table_end[];
> +#ifdef CONFIG_SWIOTLB
> +bool x86_swiotlb_enable;
> +
> +static void __init pci_swiotlb_detect(void)
> +{
> + /* don't initialize swiotlb if iommu=off (no_iommu=1) */
> + if (!no_iommu && max_possible_pfn > MAX_DMA32_PFN)
> + x86_swiotlb_enable = true;
> +
> + /*
> + * Set swiotlb to 1 so that bounce buffers are allocated and used for
> + * devices that can't support DMA to encrypted memory.
> + */
> + if (cc_platform_has(CC_ATTR_HOST_MEM_ENCRYPT))
> + x86_swiotlb_enable = true;
> +
> + if (swiotlb_force == SWIOTLB_FORCE)
> + x86_swiotlb_enable = true;
> +}
> +#else
> +static inline void __init pci_swiotlb_detect(void)
> +{
> +}
> +#endif /* CONFIG_SWIOTLB */
> +
> +#ifdef CONFIG_SWIOTLB_XEN
> +static bool xen_swiotlb;
> +
> +static void __init pci_xen_swiotlb_init(void)
> +{
> + if (!xen_initial_domain() && !x86_swiotlb_enable &&
> + swiotlb_force != SWIOTLB_FORCE)
> + return;
> + x86_swiotlb_enable = true;
> + xen_swiotlb = true;
> + xen_swiotlb_init_early();
> + dma_ops = &xen_swiotlb_dma_ops;
> + if (IS_ENABLED(CONFIG_PCI))
> + pci_request_acs();
> +}
> +
> +int pci_xen_swiotlb_init_late(void)
> +{
> + int rc;
> +
> + if (xen_swiotlb)
> + return 0;
> +
> + rc = xen_swiotlb_init();
> + if (rc)
> + return rc;
> +
> + /* XXX: this switches the dma ops under live devices! */
> + dma_ops = &xen_swiotlb_dma_ops;
> + if (IS_ENABLED(CONFIG_PCI))
> + pci_request_acs();
> + return 0;
> +}
> +EXPORT_SYMBOL_GPL(pci_xen_swiotlb_init_late);
> +#else
> +static inline void __init pci_xen_swiotlb_init(void)
> +{
> +}
> +#endif /* CONFIG_SWIOTLB_XEN */
>
> void __init pci_iommu_alloc(void)
> {
> - struct iommu_table_entry *p;
> -
> - sort_iommu_table(__iommu_table, __iommu_table_end);
> - check_iommu_entries(__iommu_table, __iommu_table_end);
> -
> - for (p = __iommu_table; p < __iommu_table_end; p++) {
> - if (p && p->detect && p->detect() > 0) {
> - p->flags |= IOMMU_DETECTED;
> - if (p->early_init)
> - p->early_init();
> - if (p->flags & IOMMU_FINISH_IF_DETECTED)
> - break;
> - }
> + if (xen_pv_domain()) {
> + pci_xen_swiotlb_init();
> + return;
> }
> + pci_swiotlb_detect();
> + gart_iommu_hole_init();
> + amd_iommu_detect();
> + detect_intel_iommu();
> + if (x86_swiotlb_enable)
> + swiotlb_init(0);
> }
>
> /*
> @@ -102,7 +164,7 @@ static __init int iommu_setup(char *p)
> }
> #ifdef CONFIG_SWIOTLB
> if (!strncmp(p, "soft", 4))
> - swiotlb = 1;
> + x86_swiotlb_enable = true;
> #endif
> if (!strncmp(p, "pt", 2))
> iommu_set_default_passthrough(true);
> @@ -121,14 +183,17 @@ early_param("iommu", iommu_setup);
>
> static int __init pci_iommu_init(void)
> {
> - struct iommu_table_entry *p;
> -
> x86_init.iommu.iommu_init();
>
> - for (p = __iommu_table; p < __iommu_table_end; p++) {
> - if (p && (p->flags & IOMMU_DETECTED) && p->late_init)
> - p->late_init();
> +#ifdef CONFIG_SWIOTLB
> + /* An IOMMU turned us off. */
> + if (x86_swiotlb_enable) {
> + pr_info("PCI-DMA: Using software bounce buffering for IO (SWIOTLB)\n");
> + swiotlb_print_info();
> + } else {
> + swiotlb_exit();
> }
> +#endif
>
> return 0;
> }
> diff --git a/arch/x86/kernel/pci-iommu_table.c b/arch/x86/kernel/pci-iommu_table.c
> deleted file mode 100644
> index 42e92ec62973b..0000000000000
> --- a/arch/x86/kernel/pci-iommu_table.c
> +++ /dev/null
> @@ -1,77 +0,0 @@
> -// SPDX-License-Identifier: GPL-2.0
> -#include <linux/dma-mapping.h>
> -#include <asm/iommu_table.h>
> -#include <linux/string.h>
> -#include <linux/kallsyms.h>
> -
> -static struct iommu_table_entry * __init
> -find_dependents_of(struct iommu_table_entry *start,
> - struct iommu_table_entry *finish,
> - struct iommu_table_entry *q)
> -{
> - struct iommu_table_entry *p;
> -
> - if (!q)
> - return NULL;
> -
> - for (p = start; p < finish; p++)
> - if (p->detect == q->depend)
> - return p;
> -
> - return NULL;
> -}
> -
> -
> -void __init sort_iommu_table(struct iommu_table_entry *start,
> - struct iommu_table_entry *finish) {
> -
> - struct iommu_table_entry *p, *q, tmp;
> -
> - for (p = start; p < finish; p++) {
> -again:
> - q = find_dependents_of(start, finish, p);
> - /* We are bit sneaky here. We use the memory address to figure
> - * out if the node we depend on is past our point, if so, swap.
> - */
> - if (q > p) {
> - tmp = *p;
> - memmove(p, q, sizeof(*p));
> - *q = tmp;
> - goto again;
> - }
> - }
> -
> -}
> -
> -#ifdef DEBUG
> -void __init check_iommu_entries(struct iommu_table_entry *start,
> - struct iommu_table_entry *finish)
> -{
> - struct iommu_table_entry *p, *q, *x;
> -
> - /* Simple cyclic dependency checker. */
> - for (p = start; p < finish; p++) {
> - q = find_dependents_of(start, finish, p);
> - x = find_dependents_of(start, finish, q);
> - if (p == x) {
> - printk(KERN_ERR "CYCLIC DEPENDENCY FOUND! %pS depends on %pS and vice-versa. BREAKING IT.\n",
> - p->detect, q->detect);
> - /* Heavy handed way..*/
> - x->depend = NULL;
> - }
> - }
> -
> - for (p = start; p < finish; p++) {
> - q = find_dependents_of(p, finish, p);
> - if (q && q > p) {
> - printk(KERN_ERR "EXECUTION ORDER INVALID! %pS should be called before %pS!\n",
> - p->detect, q->detect);
> - }
> - }
> -}
> -#else
> -void __init check_iommu_entries(struct iommu_table_entry *start,
> - struct iommu_table_entry *finish)
> -{
> -}
> -#endif
> diff --git a/arch/x86/kernel/pci-swiotlb.c b/arch/x86/kernel/pci-swiotlb.c
> deleted file mode 100644
> index 814ab46a0dada..0000000000000
> --- a/arch/x86/kernel/pci-swiotlb.c
> +++ /dev/null
> @@ -1,77 +0,0 @@
> -// SPDX-License-Identifier: GPL-2.0
> -
> -#include <linux/pci.h>
> -#include <linux/cache.h>
> -#include <linux/init.h>
> -#include <linux/swiotlb.h>
> -#include <linux/memblock.h>
> -#include <linux/dma-direct.h>
> -#include <linux/cc_platform.h>
> -
> -#include <asm/iommu.h>
> -#include <asm/swiotlb.h>
> -#include <asm/dma.h>
> -#include <asm/xen/swiotlb-xen.h>
> -#include <asm/iommu_table.h>
> -
> -int swiotlb __read_mostly;
> -
> -/*
> - * pci_swiotlb_detect_override - set swiotlb to 1 if necessary
> - *
> - * This returns non-zero if we are forced to use swiotlb (by the boot
> - * option).
> - */
> -int __init pci_swiotlb_detect_override(void)
> -{
> - if (swiotlb_force == SWIOTLB_FORCE)
> - swiotlb = 1;
> -
> - return swiotlb;
> -}
> -IOMMU_INIT_FINISH(pci_swiotlb_detect_override,
> - pci_xen_swiotlb_detect,
> - pci_swiotlb_init,
> - pci_swiotlb_late_init);
> -
> -/*
> - * If 4GB or more detected (and iommu=off not set) or if SME is active
> - * then set swiotlb to 1 and return 1.
> - */
> -int __init pci_swiotlb_detect_4gb(void)
> -{
> - /* don't initialize swiotlb if iommu=off (no_iommu=1) */
> - if (!no_iommu && max_possible_pfn > MAX_DMA32_PFN)
> - swiotlb = 1;
> -
> - /*
> - * Set swiotlb to 1 so that bounce buffers are allocated and used for
> - * devices that can't support DMA to encrypted memory.
> - */
> - if (cc_platform_has(CC_ATTR_HOST_MEM_ENCRYPT))
> - swiotlb = 1;
> -
> - return swiotlb;
> -}
> -IOMMU_INIT(pci_swiotlb_detect_4gb,
> - pci_swiotlb_detect_override,
> - pci_swiotlb_init,
> - pci_swiotlb_late_init);
> -
> -void __init pci_swiotlb_init(void)
> -{
> - if (swiotlb)
> - swiotlb_init(0);
> -}
> -
> -void __init pci_swiotlb_late_init(void)
> -{
> - /* An IOMMU turned us off. */
> - if (!swiotlb)
> - swiotlb_exit();
> - else {
> - printk(KERN_INFO "PCI-DMA: "
> - "Using software bounce buffering for IO (SWIOTLB)\n");
> - swiotlb_print_info();
> - }
> -}
> diff --git a/arch/x86/kernel/tboot.c b/arch/x86/kernel/tboot.c
> index f9af561c3cd4f..0c1154a1c4032 100644
> --- a/arch/x86/kernel/tboot.c
> +++ b/arch/x86/kernel/tboot.c
> @@ -24,7 +24,6 @@
> #include <asm/processor.h>
> #include <asm/bootparam.h>
> #include <asm/pgalloc.h>
> -#include <asm/swiotlb.h>
> #include <asm/fixmap.h>
> #include <asm/proto.h>
> #include <asm/setup.h>
> diff --git a/arch/x86/kernel/vmlinux.lds.S b/arch/x86/kernel/vmlinux.lds.S
> index 7fda7f27e7620..f5f6dc2e80072 100644
> --- a/arch/x86/kernel/vmlinux.lds.S
> +++ b/arch/x86/kernel/vmlinux.lds.S
> @@ -315,18 +315,6 @@ SECTIONS
> *(.altinstr_replacement)
> }
>
> - /*
> - * struct iommu_table_entry entries are injected in this section.
> - * It is an array of IOMMUs which during run time gets sorted depending
> - * on its dependency order. After rootfs_initcall is complete
> - * this section can be safely removed.
> - */
> - .iommu_table : AT(ADDR(.iommu_table) - LOAD_OFFSET) {
> - __iommu_table = .;
> - *(.iommu_table)
> - __iommu_table_end = .;
> - }
> -
> . = ALIGN(8);
> .apicdrivers : AT(ADDR(.apicdrivers) - LOAD_OFFSET) {
> __apicdrivers = .;
> diff --git a/arch/x86/xen/Makefile b/arch/x86/xen/Makefile
> index 4953260e281c3..3c5b52fbe4a7f 100644
> --- a/arch/x86/xen/Makefile
> +++ b/arch/x86/xen/Makefile
> @@ -47,6 +47,4 @@ obj-$(CONFIG_XEN_DEBUG_FS) += debugfs.o
>
> obj-$(CONFIG_XEN_PV_DOM0) += vga.o
>
> -obj-$(CONFIG_SWIOTLB_XEN) += pci-swiotlb-xen.o
> -
> obj-$(CONFIG_XEN_EFI) += efi.o
> diff --git a/arch/x86/xen/pci-swiotlb-xen.c b/arch/x86/xen/pci-swiotlb-xen.c
> deleted file mode 100644
> index 46df59aeaa06a..0000000000000
> --- a/arch/x86/xen/pci-swiotlb-xen.c
> +++ /dev/null
> @@ -1,96 +0,0 @@
> -// SPDX-License-Identifier: GPL-2.0
> -
> -/* Glue code to lib/swiotlb-xen.c */
> -
> -#include <linux/dma-map-ops.h>
> -#include <linux/pci.h>
> -#include <xen/swiotlb-xen.h>
> -
> -#include <asm/xen/hypervisor.h>
> -#include <xen/xen.h>
> -#include <asm/iommu_table.h>
> -
> -
> -#include <asm/xen/swiotlb-xen.h>
> -#ifdef CONFIG_X86_64
> -#include <asm/iommu.h>
> -#include <asm/dma.h>
> -#endif
> -#include <linux/export.h>
> -
> -static int xen_swiotlb __read_mostly;
> -
> -/*
> - * pci_xen_swiotlb_detect - set xen_swiotlb to 1 if necessary
> - *
> - * This returns non-zero if we are forced to use xen_swiotlb (by the boot
> - * option).
> - */
> -int __init pci_xen_swiotlb_detect(void)
> -{
> -
> - if (!xen_pv_domain())
> - return 0;
> -
> - /* If running as PV guest, either iommu=soft, or swiotlb=force will
> - * activate this IOMMU. If running as PV privileged, activate it
> - * irregardless.
> - */
> - if (xen_initial_domain() || swiotlb || swiotlb_force == SWIOTLB_FORCE)
> - xen_swiotlb = 1;
> -
> - /* If we are running under Xen, we MUST disable the native SWIOTLB.
> - * Don't worry about swiotlb_force flag activating the native, as
> - * the 'swiotlb' flag is the only one turning it on. */
> - swiotlb = 0;
> -
> -#ifdef CONFIG_X86_64
> - /* pci_swiotlb_detect_4gb turns on native SWIOTLB if no_iommu == 0
> - * (so no iommu=X command line over-writes).
> - * Considering that PV guests do not want the *native SWIOTLB* but
> - * only Xen SWIOTLB it is not useful to us so set no_iommu=1 here.
> - */
> - if (max_pfn > MAX_DMA32_PFN)
> - no_iommu = 1;
> -#endif
> - return xen_swiotlb;
> -}
> -
> -static void __init pci_xen_swiotlb_init(void)
> -{
> - if (xen_swiotlb) {
> - xen_swiotlb_init_early();
> - dma_ops = &xen_swiotlb_dma_ops;
> -
> -#ifdef CONFIG_PCI
> - /* Make sure ACS will be enabled */
> - pci_request_acs();
> -#endif
> - }
> -}
> -
> -int pci_xen_swiotlb_init_late(void)
> -{
> - int rc;
> -
> - if (xen_swiotlb)
> - return 0;
> -
> - rc = xen_swiotlb_init();
> - if (rc)
> - return rc;
> -
> - dma_ops = &xen_swiotlb_dma_ops;
> -#ifdef CONFIG_PCI
> - /* Make sure ACS will be enabled */
> - pci_request_acs();
> -#endif
> -
> - return 0;
> -}
> -EXPORT_SYMBOL_GPL(pci_xen_swiotlb_init_late);
> -
> -IOMMU_INIT_FINISH(pci_xen_swiotlb_detect,
> - NULL,
> - pci_xen_swiotlb_init,
> - NULL);
> diff --git a/drivers/iommu/amd/init.c b/drivers/iommu/amd/init.c
> index b4a798c7b347f..1a3ad58ba8465 100644
> --- a/drivers/iommu/amd/init.c
> +++ b/drivers/iommu/amd/init.c
> @@ -27,7 +27,6 @@
> #include <asm/apic.h>
> #include <asm/gart.h>
> #include <asm/x86_init.h>
> -#include <asm/iommu_table.h>
> #include <asm/io_apic.h>
> #include <asm/irq_remapping.h>
> #include <asm/set_memory.h>
> @@ -3257,11 +3256,6 @@ __setup("ivrs_ioapic", parse_ivrs_ioapic);
> __setup("ivrs_hpet", parse_ivrs_hpet);
> __setup("ivrs_acpihid", parse_ivrs_acpihid);
>
> -IOMMU_INIT_FINISH(amd_iommu_detect,
> - gart_iommu_hole_init,
> - NULL,
> - NULL);
> -
> bool amd_iommu_v2_supported(void)
> {
> return amd_iommu_v2_present;
> diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c
> index a1ada7bff44e6..b47220ac09eaa 100644
> --- a/drivers/iommu/amd/iommu.c
> +++ b/drivers/iommu/amd/iommu.c
> @@ -1840,7 +1840,10 @@ void amd_iommu_domain_update(struct protection_domain *domain)
>
> static void __init amd_iommu_init_dma_ops(void)
> {
> - swiotlb = (iommu_default_passthrough() || sme_me_mask) ? 1 : 0;
> + if (iommu_default_passthrough() || sme_me_mask)
> + x86_swiotlb_enable = true;
> + else
> + x86_swiotlb_enable = false;
> }
>
> int __init amd_iommu_init_api(void)
> diff --git a/drivers/iommu/intel/dmar.c b/drivers/iommu/intel/dmar.c
> index 4de960834a1b2..592c1e1a5d4b9 100644
> --- a/drivers/iommu/intel/dmar.c
> +++ b/drivers/iommu/intel/dmar.c
> @@ -30,7 +30,6 @@
> #include <linux/numa.h>
> #include <linux/limits.h>
> #include <asm/irq_remapping.h>
> -#include <asm/iommu_table.h>
> #include <trace/events/intel_iommu.h>
>
> #include "../irq_remapping.h"
> @@ -912,7 +911,7 @@ dmar_validate_one_drhd(struct acpi_dmar_header *entry, void *arg)
> return 0;
> }
>
> -int __init detect_intel_iommu(void)
> +void __init detect_intel_iommu(void)
> {
> int ret;
> struct dmar_res_callback validate_drhd_cb = {
> @@ -945,8 +944,6 @@ int __init detect_intel_iommu(void)
> dmar_tbl = NULL;
> }
> up_write(&dmar_global_lock);
> -
> - return ret ? ret : 1;
> }
>
> static void unmap_iommu(struct intel_iommu *iommu)
> @@ -2164,7 +2161,6 @@ static int __init dmar_free_unused_resources(void)
> }
>
> late_initcall(dmar_free_unused_resources);
> -IOMMU_INIT_POST(detect_intel_iommu);
>
> /*
> * DMAR Hotplug Support
> diff --git a/include/linux/dmar.h b/include/linux/dmar.h
> index 45e903d847335..cbd714a198a0a 100644
> --- a/include/linux/dmar.h
> +++ b/include/linux/dmar.h
> @@ -121,7 +121,7 @@ extern int dmar_remove_dev_scope(struct dmar_pci_notify_info *info,
> u16 segment, struct dmar_dev_scope *devices,
> int count);
> /* Intel IOMMU detection */
> -extern int detect_intel_iommu(void);
> +void detect_intel_iommu(void);
> extern int enable_drhd_fault_handling(void);
> extern int dmar_device_add(acpi_handle handle);
> extern int dmar_device_remove(acpi_handle handle);
> @@ -197,6 +197,10 @@ static inline bool dmar_platform_optin(void)
> return false;
> }
>
> +static inline void detect_intel_iommu(void)
> +{
> +}
> +
> #endif /* CONFIG_DMAR_TABLE */
>
> struct irte {
> --
> 2.30.2
>
^ permalink raw reply [flat|nested] 31+ messages in thread
* [PATCH 08/15] x86: centralize setting SWIOTLB_FORCE when guest memory encryption is enabled
2022-04-04 5:05 cleanup swiotlb initialization v8 Christoph Hellwig
` (6 preceding siblings ...)
2022-04-04 5:05 ` [PATCH 07/15] x86: remove the IOMMU table infrastructure Christoph Hellwig
@ 2022-04-04 5:05 ` Christoph Hellwig
2022-04-04 5:05 ` [PATCH 09/15] swiotlb: make the swiotlb_init interface more useful Christoph Hellwig
` (10 subsequent siblings)
18 siblings, 0 replies; 31+ messages in thread
From: Christoph Hellwig @ 2022-04-04 5:05 UTC (permalink / raw)
To: iommu
Cc: x86, Anshuman Khandual, Tom Lendacky, Konrad Rzeszutek Wilk,
Stefano Stabellini, Boris Ostrovsky, Juergen Gross, Joerg Roedel,
David Woodhouse, Lu Baolu, Robin Murphy, linux-arm-kernel,
xen-devel, linux-ia64, linux-mips, linuxppc-dev, linux-riscv,
linux-s390, linux-hyperv, tboot-devel, linux-pci
Move enabling SWIOTLB_FORCE for guest memory encryption into common code.
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
arch/x86/kernel/cpu/mshyperv.c | 8 --------
arch/x86/kernel/pci-dma.c | 8 ++++++++
arch/x86/mm/mem_encrypt_amd.c | 3 ---
3 files changed, 8 insertions(+), 11 deletions(-)
diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c
index 4b67094215bba..5b8f2c3571601 100644
--- a/arch/x86/kernel/cpu/mshyperv.c
+++ b/arch/x86/kernel/cpu/mshyperv.c
@@ -337,14 +337,6 @@ static void __init ms_hyperv_init_platform(void)
swiotlb_unencrypted_base = ms_hyperv.shared_gpa_boundary;
#endif
}
-
-#ifdef CONFIG_SWIOTLB
- /*
- * Enable swiotlb force mode in Isolation VM to
- * use swiotlb bounce buffer for dma transaction.
- */
- swiotlb_force = SWIOTLB_FORCE;
-#endif
/* Isolation VMs are unenlightened SEV-based VMs, thus this check: */
if (IS_ENABLED(CONFIG_AMD_MEM_ENCRYPT)) {
if (hv_get_isolation_type() != HV_ISOLATION_TYPE_NONE)
diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c
index df96926421be0..04140e20ef1a3 100644
--- a/arch/x86/kernel/pci-dma.c
+++ b/arch/x86/kernel/pci-dma.c
@@ -53,6 +53,14 @@ static void __init pci_swiotlb_detect(void)
if (cc_platform_has(CC_ATTR_HOST_MEM_ENCRYPT))
x86_swiotlb_enable = true;
+ /*
+ * Guest with guest memory encryption currently perform all DMA through
+ * bounce buffers as the hypervisor can't access arbitrary VM memory
+ * that is not explicitly shared with it.
+ */
+ if (cc_platform_has(CC_ATTR_GUEST_MEM_ENCRYPT))
+ swiotlb_force = SWIOTLB_FORCE;
+
if (swiotlb_force == SWIOTLB_FORCE)
x86_swiotlb_enable = true;
}
diff --git a/arch/x86/mm/mem_encrypt_amd.c b/arch/x86/mm/mem_encrypt_amd.c
index 6169053c28541..d732d727d3dee 100644
--- a/arch/x86/mm/mem_encrypt_amd.c
+++ b/arch/x86/mm/mem_encrypt_amd.c
@@ -432,9 +432,6 @@ void __init sme_early_init(void)
for (i = 0; i < ARRAY_SIZE(protection_map); i++)
protection_map[i] = pgprot_encrypted(protection_map[i]);
- if (cc_platform_has(CC_ATTR_GUEST_MEM_ENCRYPT))
- swiotlb_force = SWIOTLB_FORCE;
-
x86_platform.guest.enc_status_change_prepare = amd_enc_status_change_prepare;
x86_platform.guest.enc_status_change_finish = amd_enc_status_change_finish;
x86_platform.guest.enc_tlb_flush_required = amd_enc_tlb_flush_required;
--
2.30.2
^ permalink raw reply related [flat|nested] 31+ messages in thread* [PATCH 09/15] swiotlb: make the swiotlb_init interface more useful
2022-04-04 5:05 cleanup swiotlb initialization v8 Christoph Hellwig
` (7 preceding siblings ...)
2022-04-04 5:05 ` [PATCH 08/15] x86: centralize setting SWIOTLB_FORCE when guest memory encryption is enabled Christoph Hellwig
@ 2022-04-04 5:05 ` Christoph Hellwig
2022-04-04 17:00 ` Michael Kelley (LINUX)
2022-06-01 17:25 ` Nathan Chancellor
2022-04-04 5:05 ` [PATCH 10/15] swiotlb: add a SWIOTLB_ANY flag to lift the low memory restriction Christoph Hellwig
` (9 subsequent siblings)
18 siblings, 2 replies; 31+ messages in thread
From: Christoph Hellwig @ 2022-04-04 5:05 UTC (permalink / raw)
To: iommu
Cc: x86, Anshuman Khandual, Tom Lendacky, Konrad Rzeszutek Wilk,
Stefano Stabellini, Boris Ostrovsky, Juergen Gross, Joerg Roedel,
David Woodhouse, Lu Baolu, Robin Murphy, linux-arm-kernel,
xen-devel, linux-ia64, linux-mips, linuxppc-dev, linux-riscv,
linux-s390, linux-hyperv, tboot-devel, linux-pci
Pass a bool to pass if swiotlb needs to be enabled based on the
addressing needs and replace the verbose argument with a set of
flags, including one to force enable bounce buffering.
Note that this patch removes the possibility to force xen-swiotlb
use using swiotlb=force on the command line on x86 (arm and arm64
never supported that), but this interface will be restored shortly.
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
arch/arm/mm/init.c | 6 +----
arch/arm64/mm/init.c | 6 +----
arch/ia64/mm/init.c | 4 +--
arch/mips/cavium-octeon/dma-octeon.c | 2 +-
arch/mips/loongson64/dma.c | 2 +-
arch/mips/sibyte/common/dma.c | 2 +-
arch/powerpc/mm/mem.c | 3 ++-
arch/powerpc/platforms/pseries/setup.c | 3 ---
arch/riscv/mm/init.c | 8 +-----
arch/s390/mm/init.c | 3 +--
arch/x86/kernel/pci-dma.c | 15 ++++++-----
drivers/xen/swiotlb-xen.c | 4 +--
include/linux/swiotlb.h | 15 ++++++-----
include/trace/events/swiotlb.h | 29 ++++++++-------------
kernel/dma/swiotlb.c | 35 ++++++++++++++------------
15 files changed, 55 insertions(+), 82 deletions(-)
diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c
index fe249ea919083..ce64bdb55a16b 100644
--- a/arch/arm/mm/init.c
+++ b/arch/arm/mm/init.c
@@ -271,11 +271,7 @@ static void __init free_highpages(void)
void __init mem_init(void)
{
#ifdef CONFIG_ARM_LPAE
- if (swiotlb_force == SWIOTLB_FORCE ||
- max_pfn > arm_dma_pfn_limit)
- swiotlb_init(1);
- else
- swiotlb_force = SWIOTLB_NO_FORCE;
+ swiotlb_init(max_pfn > arm_dma_pfn_limit, SWIOTLB_VERBOSE);
#endif
set_max_mapnr(pfn_to_page(max_pfn) - mem_map);
diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
index 8ac25f19084e8..7b6ea4d6733d6 100644
--- a/arch/arm64/mm/init.c
+++ b/arch/arm64/mm/init.c
@@ -398,11 +398,7 @@ void __init bootmem_init(void)
*/
void __init mem_init(void)
{
- if (swiotlb_force == SWIOTLB_FORCE ||
- max_pfn > PFN_DOWN(arm64_dma_phys_limit))
- swiotlb_init(1);
- else if (!xen_swiotlb_detect())
- swiotlb_force = SWIOTLB_NO_FORCE;
+ swiotlb_init(max_pfn > PFN_DOWN(arm64_dma_phys_limit), SWIOTLB_VERBOSE);
/* this will put all unused low memory onto the freelists */
memblock_free_all();
diff --git a/arch/ia64/mm/init.c b/arch/ia64/mm/init.c
index 5d165607bf354..3c3e15b22608f 100644
--- a/arch/ia64/mm/init.c
+++ b/arch/ia64/mm/init.c
@@ -437,9 +437,7 @@ mem_init (void)
if (iommu_detected)
break;
#endif
-#ifdef CONFIG_SWIOTLB
- swiotlb_init(1);
-#endif
+ swiotlb_init(true, SWIOTLB_VERBOSE);
} while (0);
#ifdef CONFIG_FLATMEM
diff --git a/arch/mips/cavium-octeon/dma-octeon.c b/arch/mips/cavium-octeon/dma-octeon.c
index fb7547e217263..9fbba6a8fa4c5 100644
--- a/arch/mips/cavium-octeon/dma-octeon.c
+++ b/arch/mips/cavium-octeon/dma-octeon.c
@@ -235,5 +235,5 @@ void __init plat_swiotlb_setup(void)
#endif
swiotlb_adjust_size(swiotlbsize);
- swiotlb_init(1);
+ swiotlb_init(true, SWIOTLB_VERBOSE);
}
diff --git a/arch/mips/loongson64/dma.c b/arch/mips/loongson64/dma.c
index 364f2f27c8723..8220a1bc0db64 100644
--- a/arch/mips/loongson64/dma.c
+++ b/arch/mips/loongson64/dma.c
@@ -24,5 +24,5 @@ phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
void __init plat_swiotlb_setup(void)
{
- swiotlb_init(1);
+ swiotlb_init(true, SWIOTLB_VERBOSE);
}
diff --git a/arch/mips/sibyte/common/dma.c b/arch/mips/sibyte/common/dma.c
index eb47a94f3583e..c5c2c782aff68 100644
--- a/arch/mips/sibyte/common/dma.c
+++ b/arch/mips/sibyte/common/dma.c
@@ -10,5 +10,5 @@
void __init plat_swiotlb_setup(void)
{
- swiotlb_init(1);
+ swiotlb_init(true, SWIOTLB_VERBOSE);
}
diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
index 8e301cd8925b2..e1519e2edc656 100644
--- a/arch/powerpc/mm/mem.c
+++ b/arch/powerpc/mm/mem.c
@@ -17,6 +17,7 @@
#include <linux/suspend.h>
#include <linux/dma-direct.h>
+#include <asm/swiotlb.h>
#include <asm/machdep.h>
#include <asm/rtas.h>
#include <asm/kasan.h>
@@ -251,7 +252,7 @@ void __init mem_init(void)
if (is_secure_guest())
svm_swiotlb_init();
else
- swiotlb_init(0);
+ swiotlb_init(ppc_swiotlb_enable, 0);
#endif
high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
diff --git a/arch/powerpc/platforms/pseries/setup.c b/arch/powerpc/platforms/pseries/setup.c
index 069d7b3bb142e..c6e06d91b6602 100644
--- a/arch/powerpc/platforms/pseries/setup.c
+++ b/arch/powerpc/platforms/pseries/setup.c
@@ -838,9 +838,6 @@ static void __init pSeries_setup_arch(void)
}
ppc_md.pcibios_root_bridge_prepare = pseries_root_bridge_prepare;
-
- if (swiotlb_force == SWIOTLB_FORCE)
- ppc_swiotlb_enable = 1;
}
static void pseries_panic(char *str)
diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
index 9535bea8688c0..181ffd322eafa 100644
--- a/arch/riscv/mm/init.c
+++ b/arch/riscv/mm/init.c
@@ -120,13 +120,7 @@ void __init mem_init(void)
BUG_ON(!mem_map);
#endif /* CONFIG_FLATMEM */
-#ifdef CONFIG_SWIOTLB
- if (swiotlb_force == SWIOTLB_FORCE ||
- max_pfn > PFN_DOWN(dma32_phys_limit))
- swiotlb_init(1);
- else
- swiotlb_force = SWIOTLB_NO_FORCE;
-#endif
+ swiotlb_init(max_pfn > PFN_DOWN(dma32_phys_limit), SWIOTLB_VERBOSE);
memblock_free_all();
print_vm_layout();
diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c
index 86ffd0d51fd59..6fb6bf64326f9 100644
--- a/arch/s390/mm/init.c
+++ b/arch/s390/mm/init.c
@@ -185,8 +185,7 @@ static void pv_init(void)
return;
/* make sure bounce buffers are shared */
- swiotlb_force = SWIOTLB_FORCE;
- swiotlb_init(1);
+ swiotlb_init(true, SWIOTLB_FORCE | SWIOTLB_VERBOSE);
swiotlb_update_mem_attributes();
}
diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c
index 04140e20ef1a3..a705a199bf8a3 100644
--- a/arch/x86/kernel/pci-dma.c
+++ b/arch/x86/kernel/pci-dma.c
@@ -39,6 +39,7 @@ int iommu_detected __read_mostly = 0;
#ifdef CONFIG_SWIOTLB
bool x86_swiotlb_enable;
+static unsigned int x86_swiotlb_flags;
static void __init pci_swiotlb_detect(void)
{
@@ -58,16 +59,16 @@ static void __init pci_swiotlb_detect(void)
* bounce buffers as the hypervisor can't access arbitrary VM memory
* that is not explicitly shared with it.
*/
- if (cc_platform_has(CC_ATTR_GUEST_MEM_ENCRYPT))
- swiotlb_force = SWIOTLB_FORCE;
-
- if (swiotlb_force == SWIOTLB_FORCE)
+ if (cc_platform_has(CC_ATTR_GUEST_MEM_ENCRYPT)) {
x86_swiotlb_enable = true;
+ x86_swiotlb_flags |= SWIOTLB_FORCE;
+ }
}
#else
static inline void __init pci_swiotlb_detect(void)
{
}
+#define x86_swiotlb_flags 0
#endif /* CONFIG_SWIOTLB */
#ifdef CONFIG_SWIOTLB_XEN
@@ -75,8 +76,7 @@ static bool xen_swiotlb;
static void __init pci_xen_swiotlb_init(void)
{
- if (!xen_initial_domain() && !x86_swiotlb_enable &&
- swiotlb_force != SWIOTLB_FORCE)
+ if (!xen_initial_domain() && !x86_swiotlb_enable)
return;
x86_swiotlb_enable = true;
xen_swiotlb = true;
@@ -120,8 +120,7 @@ void __init pci_iommu_alloc(void)
gart_iommu_hole_init();
amd_iommu_detect();
detect_intel_iommu();
- if (x86_swiotlb_enable)
- swiotlb_init(0);
+ swiotlb_init(x86_swiotlb_enable, x86_swiotlb_flags);
}
/*
diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c
index 485cd06ed39e7..c2da3eb4826e8 100644
--- a/drivers/xen/swiotlb-xen.c
+++ b/drivers/xen/swiotlb-xen.c
@@ -251,7 +251,7 @@ void __init xen_swiotlb_init_early(void)
panic("%s (rc:%d)", xen_swiotlb_error(XEN_SWIOTLB_EFIXUP), rc);
}
- if (swiotlb_init_with_tbl(start, nslabs, true))
+ if (swiotlb_init_with_tbl(start, nslabs, SWIOTLB_VERBOSE))
panic("Cannot allocate SWIOTLB buffer");
}
#endif /* CONFIG_X86 */
@@ -376,7 +376,7 @@ static dma_addr_t xen_swiotlb_map_page(struct device *dev, struct page *page,
/*
* Oh well, have to allocate and map a bounce buffer.
*/
- trace_swiotlb_bounced(dev, dev_addr, size, swiotlb_force);
+ trace_swiotlb_bounced(dev, dev_addr, size);
map = swiotlb_tbl_map_single(dev, phys, size, size, 0, dir, attrs);
if (map == (phys_addr_t)DMA_MAPPING_ERROR)
diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h
index b48b26bfa0edb..ae0407173e845 100644
--- a/include/linux/swiotlb.h
+++ b/include/linux/swiotlb.h
@@ -13,11 +13,8 @@ struct device;
struct page;
struct scatterlist;
-enum swiotlb_force {
- SWIOTLB_NORMAL, /* Default - depending on HW DMA mask etc. */
- SWIOTLB_FORCE, /* swiotlb=force */
- SWIOTLB_NO_FORCE, /* swiotlb=noforce */
-};
+#define SWIOTLB_VERBOSE (1 << 0) /* verbose initialization */
+#define SWIOTLB_FORCE (1 << 1) /* force bounce buffering */
/*
* Maximum allowable number of contiguous slabs to map,
@@ -36,8 +33,7 @@ enum swiotlb_force {
/* default to 64MB */
#define IO_TLB_DEFAULT_SIZE (64UL<<20)
-extern void swiotlb_init(int verbose);
-int swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose);
+int swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, unsigned int flags);
unsigned long swiotlb_size_or_default(void);
extern int swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs);
int swiotlb_init_late(size_t size);
@@ -126,13 +122,16 @@ static inline bool is_swiotlb_force_bounce(struct device *dev)
return mem && mem->force_bounce;
}
+void swiotlb_init(bool addressing_limited, unsigned int flags);
void __init swiotlb_exit(void);
unsigned int swiotlb_max_segment(void);
size_t swiotlb_max_mapping_size(struct device *dev);
bool is_swiotlb_active(struct device *dev);
void __init swiotlb_adjust_size(unsigned long size);
#else
-#define swiotlb_force SWIOTLB_NO_FORCE
+static inline void swiotlb_init(bool addressing_limited, unsigned int flags)
+{
+}
static inline bool is_swiotlb_buffer(struct device *dev, phys_addr_t paddr)
{
return false;
diff --git a/include/trace/events/swiotlb.h b/include/trace/events/swiotlb.h
index 705be43b71ab0..da05c9ebd224a 100644
--- a/include/trace/events/swiotlb.h
+++ b/include/trace/events/swiotlb.h
@@ -8,20 +8,15 @@
#include <linux/tracepoint.h>
TRACE_EVENT(swiotlb_bounced,
-
- TP_PROTO(struct device *dev,
- dma_addr_t dev_addr,
- size_t size,
- enum swiotlb_force swiotlb_force),
-
- TP_ARGS(dev, dev_addr, size, swiotlb_force),
+ TP_PROTO(struct device *dev, dma_addr_t dev_addr, size_t size),
+ TP_ARGS(dev, dev_addr, size),
TP_STRUCT__entry(
- __string( dev_name, dev_name(dev) )
- __field( u64, dma_mask )
- __field( dma_addr_t, dev_addr )
- __field( size_t, size )
- __field( enum swiotlb_force, swiotlb_force )
+ __string(dev_name, dev_name(dev))
+ __field(u64, dma_mask)
+ __field(dma_addr_t, dev_addr)
+ __field(size_t, size)
+ __field(bool, force)
),
TP_fast_assign(
@@ -29,19 +24,15 @@ TRACE_EVENT(swiotlb_bounced,
__entry->dma_mask = (dev->dma_mask ? *dev->dma_mask : 0);
__entry->dev_addr = dev_addr;
__entry->size = size;
- __entry->swiotlb_force = swiotlb_force;
+ __entry->force = is_swiotlb_force_bounce(dev);
),
- TP_printk("dev_name: %s dma_mask=%llx dev_addr=%llx "
- "size=%zu %s",
+ TP_printk("dev_name: %s dma_mask=%llx dev_addr=%llx size=%zu %s",
__get_str(dev_name),
__entry->dma_mask,
(unsigned long long)__entry->dev_addr,
__entry->size,
- __print_symbolic(__entry->swiotlb_force,
- { SWIOTLB_NORMAL, "NORMAL" },
- { SWIOTLB_FORCE, "FORCE" },
- { SWIOTLB_NO_FORCE, "NO_FORCE" }))
+ __entry->force ? "FORCE" : "NORMAL")
);
#endif /* _TRACE_SWIOTLB_H */
diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c
index 9a4fe6e48a074..86e877a96b828 100644
--- a/kernel/dma/swiotlb.c
+++ b/kernel/dma/swiotlb.c
@@ -62,7 +62,8 @@
#define INVALID_PHYS_ADDR (~(phys_addr_t)0)
-enum swiotlb_force swiotlb_force;
+static bool swiotlb_force_bounce;
+static bool swiotlb_force_disable;
struct io_tlb_mem io_tlb_default_mem;
@@ -81,9 +82,9 @@ setup_io_tlb_npages(char *str)
if (*str == ',')
++str;
if (!strcmp(str, "force"))
- swiotlb_force = SWIOTLB_FORCE;
+ swiotlb_force_bounce = true;
else if (!strcmp(str, "noforce"))
- swiotlb_force = SWIOTLB_NO_FORCE;
+ swiotlb_force_disable = true;
return 0;
}
@@ -202,7 +203,7 @@ static void swiotlb_init_io_tlb_mem(struct io_tlb_mem *mem, phys_addr_t start,
mem->index = 0;
mem->late_alloc = late_alloc;
- if (swiotlb_force == SWIOTLB_FORCE)
+ if (swiotlb_force_bounce)
mem->force_bounce = true;
spin_lock_init(&mem->lock);
@@ -224,12 +225,13 @@ static void swiotlb_init_io_tlb_mem(struct io_tlb_mem *mem, phys_addr_t start,
return;
}
-int __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose)
+int __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs,
+ unsigned int flags)
{
struct io_tlb_mem *mem = &io_tlb_default_mem;
size_t alloc_size;
- if (swiotlb_force == SWIOTLB_NO_FORCE)
+ if (swiotlb_force_disable)
return 0;
/* protect against double initialization */
@@ -243,8 +245,9 @@ int __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose)
__func__, alloc_size, PAGE_SIZE);
swiotlb_init_io_tlb_mem(mem, __pa(tlb), nslabs, false);
+ mem->force_bounce = flags & SWIOTLB_FORCE;
- if (verbose)
+ if (flags & SWIOTLB_VERBOSE)
swiotlb_print_info();
return 0;
}
@@ -253,20 +256,21 @@ int __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose)
* Statically reserve bounce buffer space and initialize bounce buffer data
* structures for the software IO TLB used to implement the DMA API.
*/
-void __init
-swiotlb_init(int verbose)
+void __init swiotlb_init(bool addressing_limit, unsigned int flags)
{
size_t bytes = PAGE_ALIGN(default_nslabs << IO_TLB_SHIFT);
void *tlb;
- if (swiotlb_force == SWIOTLB_NO_FORCE)
+ if (!addressing_limit && !swiotlb_force_bounce)
+ return;
+ if (swiotlb_force_disable)
return;
/* Get IO TLB memory from the low pages */
tlb = memblock_alloc_low(bytes, PAGE_SIZE);
if (!tlb)
goto fail;
- if (swiotlb_init_with_tbl(tlb, default_nslabs, verbose))
+ if (swiotlb_init_with_tbl(tlb, default_nslabs, flags))
goto fail_free_mem;
return;
@@ -289,7 +293,7 @@ int swiotlb_init_late(size_t size)
unsigned int order;
int rc = 0;
- if (swiotlb_force == SWIOTLB_NO_FORCE)
+ if (swiotlb_force_disable)
return 0;
/*
@@ -328,7 +332,7 @@ swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs)
struct io_tlb_mem *mem = &io_tlb_default_mem;
unsigned long bytes = nslabs << IO_TLB_SHIFT;
- if (swiotlb_force == SWIOTLB_NO_FORCE)
+ if (swiotlb_force_disable)
return 0;
/* protect against double initialization */
@@ -353,7 +357,7 @@ void __init swiotlb_exit(void)
unsigned long tbl_vaddr;
size_t tbl_size, slots_size;
- if (swiotlb_force == SWIOTLB_FORCE)
+ if (swiotlb_force_bounce)
return;
if (!mem->nslabs)
@@ -704,8 +708,7 @@ dma_addr_t swiotlb_map(struct device *dev, phys_addr_t paddr, size_t size,
phys_addr_t swiotlb_addr;
dma_addr_t dma_addr;
- trace_swiotlb_bounced(dev, phys_to_dma(dev, paddr), size,
- swiotlb_force);
+ trace_swiotlb_bounced(dev, phys_to_dma(dev, paddr), size);
swiotlb_addr = swiotlb_tbl_map_single(dev, paddr, size, size, 0, dir,
attrs);
--
2.30.2
^ permalink raw reply related [flat|nested] 31+ messages in thread* RE: [PATCH 09/15] swiotlb: make the swiotlb_init interface more useful
2022-04-04 5:05 ` [PATCH 09/15] swiotlb: make the swiotlb_init interface more useful Christoph Hellwig
@ 2022-04-04 17:00 ` Michael Kelley (LINUX)
2022-06-01 17:25 ` Nathan Chancellor
1 sibling, 0 replies; 31+ messages in thread
From: Michael Kelley (LINUX) @ 2022-04-04 17:00 UTC (permalink / raw)
To: Christoph Hellwig, iommu
Cc: x86, Anshuman Khandual, Tom Lendacky, Konrad Rzeszutek Wilk,
Stefano Stabellini, Boris Ostrovsky, Juergen Gross, Joerg Roedel,
David Woodhouse, Lu Baolu, Robin Murphy, linux-arm-kernel,
xen-devel, linux-ia64, linux-mips, linuxppc-dev, linux-riscv,
linux-s390, linux-hyperv, tboot-devel, linux-pci
From: Christoph Hellwig <hch@lst.de> Sent: Sunday, April 3, 2022 10:06 PM
>
> Pass a bool to pass if swiotlb needs to be enabled based on the
Wording problems. I'm not sure what you meant to say.
> addressing needs and replace the verbose argument with a set of
> flags, including one to force enable bounce buffering.
>
> Note that this patch removes the possibility to force xen-swiotlb
> use using swiotlb=force on the command line on x86 (arm and arm64
> never supported that), but this interface will be restored shortly.
>
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
> arch/arm/mm/init.c | 6 +----
> arch/arm64/mm/init.c | 6 +----
> arch/ia64/mm/init.c | 4 +--
> arch/mips/cavium-octeon/dma-octeon.c | 2 +-
> arch/mips/loongson64/dma.c | 2 +-
> arch/mips/sibyte/common/dma.c | 2 +-
> arch/powerpc/mm/mem.c | 3 ++-
> arch/powerpc/platforms/pseries/setup.c | 3 ---
> arch/riscv/mm/init.c | 8 +-----
> arch/s390/mm/init.c | 3 +--
> arch/x86/kernel/pci-dma.c | 15 ++++++-----
> drivers/xen/swiotlb-xen.c | 4 +--
> include/linux/swiotlb.h | 15 ++++++-----
> include/trace/events/swiotlb.h | 29 ++++++++-------------
> kernel/dma/swiotlb.c | 35 ++++++++++++++------------
> 15 files changed, 55 insertions(+), 82 deletions(-)
>
> diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c
> index fe249ea919083..ce64bdb55a16b 100644
> --- a/arch/arm/mm/init.c
> +++ b/arch/arm/mm/init.c
> @@ -271,11 +271,7 @@ static void __init free_highpages(void)
> void __init mem_init(void)
> {
> #ifdef CONFIG_ARM_LPAE
> - if (swiotlb_force == SWIOTLB_FORCE ||
> - max_pfn > arm_dma_pfn_limit)
> - swiotlb_init(1);
> - else
> - swiotlb_force = SWIOTLB_NO_FORCE;
> + swiotlb_init(max_pfn > arm_dma_pfn_limit, SWIOTLB_VERBOSE);
> #endif
>
> set_max_mapnr(pfn_to_page(max_pfn) - mem_map);
> diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
> index 8ac25f19084e8..7b6ea4d6733d6 100644
> --- a/arch/arm64/mm/init.c
> +++ b/arch/arm64/mm/init.c
> @@ -398,11 +398,7 @@ void __init bootmem_init(void)
> */
> void __init mem_init(void)
> {
> - if (swiotlb_force == SWIOTLB_FORCE ||
> - max_pfn > PFN_DOWN(arm64_dma_phys_limit))
> - swiotlb_init(1);
> - else if (!xen_swiotlb_detect())
> - swiotlb_force = SWIOTLB_NO_FORCE;
> + swiotlb_init(max_pfn > PFN_DOWN(arm64_dma_phys_limit),
> SWIOTLB_VERBOSE);
>
> /* this will put all unused low memory onto the freelists */
> memblock_free_all();
> diff --git a/arch/ia64/mm/init.c b/arch/ia64/mm/init.c
> index 5d165607bf354..3c3e15b22608f 100644
> --- a/arch/ia64/mm/init.c
> +++ b/arch/ia64/mm/init.c
> @@ -437,9 +437,7 @@ mem_init (void)
> if (iommu_detected)
> break;
> #endif
> -#ifdef CONFIG_SWIOTLB
> - swiotlb_init(1);
> -#endif
> + swiotlb_init(true, SWIOTLB_VERBOSE);
> } while (0);
>
> #ifdef CONFIG_FLATMEM
> diff --git a/arch/mips/cavium-octeon/dma-octeon.c b/arch/mips/cavium-octeon/dma-
> octeon.c
> index fb7547e217263..9fbba6a8fa4c5 100644
> --- a/arch/mips/cavium-octeon/dma-octeon.c
> +++ b/arch/mips/cavium-octeon/dma-octeon.c
> @@ -235,5 +235,5 @@ void __init plat_swiotlb_setup(void)
> #endif
>
> swiotlb_adjust_size(swiotlbsize);
> - swiotlb_init(1);
> + swiotlb_init(true, SWIOTLB_VERBOSE);
> }
> diff --git a/arch/mips/loongson64/dma.c b/arch/mips/loongson64/dma.c
> index 364f2f27c8723..8220a1bc0db64 100644
> --- a/arch/mips/loongson64/dma.c
> +++ b/arch/mips/loongson64/dma.c
> @@ -24,5 +24,5 @@ phys_addr_t dma_to_phys(struct device *dev, dma_addr_t
> daddr)
>
> void __init plat_swiotlb_setup(void)
> {
> - swiotlb_init(1);
> + swiotlb_init(true, SWIOTLB_VERBOSE);
> }
> diff --git a/arch/mips/sibyte/common/dma.c b/arch/mips/sibyte/common/dma.c
> index eb47a94f3583e..c5c2c782aff68 100644
> --- a/arch/mips/sibyte/common/dma.c
> +++ b/arch/mips/sibyte/common/dma.c
> @@ -10,5 +10,5 @@
>
> void __init plat_swiotlb_setup(void)
> {
> - swiotlb_init(1);
> + swiotlb_init(true, SWIOTLB_VERBOSE);
> }
> diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
> index 8e301cd8925b2..e1519e2edc656 100644
> --- a/arch/powerpc/mm/mem.c
> +++ b/arch/powerpc/mm/mem.c
> @@ -17,6 +17,7 @@
> #include <linux/suspend.h>
> #include <linux/dma-direct.h>
>
> +#include <asm/swiotlb.h>
> #include <asm/machdep.h>
> #include <asm/rtas.h>
> #include <asm/kasan.h>
> @@ -251,7 +252,7 @@ void __init mem_init(void)
> if (is_secure_guest())
> svm_swiotlb_init();
> else
> - swiotlb_init(0);
> + swiotlb_init(ppc_swiotlb_enable, 0);
> #endif
>
> high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
> diff --git a/arch/powerpc/platforms/pseries/setup.c
> b/arch/powerpc/platforms/pseries/setup.c
> index 069d7b3bb142e..c6e06d91b6602 100644
> --- a/arch/powerpc/platforms/pseries/setup.c
> +++ b/arch/powerpc/platforms/pseries/setup.c
> @@ -838,9 +838,6 @@ static void __init pSeries_setup_arch(void)
> }
>
> ppc_md.pcibios_root_bridge_prepare = pseries_root_bridge_prepare;
> -
> - if (swiotlb_force == SWIOTLB_FORCE)
> - ppc_swiotlb_enable = 1;
> }
>
> static void pseries_panic(char *str)
> diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
> index 9535bea8688c0..181ffd322eafa 100644
> --- a/arch/riscv/mm/init.c
> +++ b/arch/riscv/mm/init.c
> @@ -120,13 +120,7 @@ void __init mem_init(void)
> BUG_ON(!mem_map);
> #endif /* CONFIG_FLATMEM */
>
> -#ifdef CONFIG_SWIOTLB
> - if (swiotlb_force == SWIOTLB_FORCE ||
> - max_pfn > PFN_DOWN(dma32_phys_limit))
> - swiotlb_init(1);
> - else
> - swiotlb_force = SWIOTLB_NO_FORCE;
> -#endif
> + swiotlb_init(max_pfn > PFN_DOWN(dma32_phys_limit), SWIOTLB_VERBOSE);
> memblock_free_all();
>
> print_vm_layout();
> diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c
> index 86ffd0d51fd59..6fb6bf64326f9 100644
> --- a/arch/s390/mm/init.c
> +++ b/arch/s390/mm/init.c
> @@ -185,8 +185,7 @@ static void pv_init(void)
> return;
>
> /* make sure bounce buffers are shared */
> - swiotlb_force = SWIOTLB_FORCE;
> - swiotlb_init(1);
> + swiotlb_init(true, SWIOTLB_FORCE | SWIOTLB_VERBOSE);
> swiotlb_update_mem_attributes();
> }
>
> diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c
> index 04140e20ef1a3..a705a199bf8a3 100644
> --- a/arch/x86/kernel/pci-dma.c
> +++ b/arch/x86/kernel/pci-dma.c
> @@ -39,6 +39,7 @@ int iommu_detected __read_mostly = 0;
>
> #ifdef CONFIG_SWIOTLB
> bool x86_swiotlb_enable;
> +static unsigned int x86_swiotlb_flags;
>
> static void __init pci_swiotlb_detect(void)
> {
> @@ -58,16 +59,16 @@ static void __init pci_swiotlb_detect(void)
> * bounce buffers as the hypervisor can't access arbitrary VM memory
> * that is not explicitly shared with it.
> */
> - if (cc_platform_has(CC_ATTR_GUEST_MEM_ENCRYPT))
> - swiotlb_force = SWIOTLB_FORCE;
> -
> - if (swiotlb_force == SWIOTLB_FORCE)
> + if (cc_platform_has(CC_ATTR_GUEST_MEM_ENCRYPT)) {
> x86_swiotlb_enable = true;
> + x86_swiotlb_flags |= SWIOTLB_FORCE;
> + }
> }
> #else
> static inline void __init pci_swiotlb_detect(void)
> {
> }
> +#define x86_swiotlb_flags 0
> #endif /* CONFIG_SWIOTLB */
>
> #ifdef CONFIG_SWIOTLB_XEN
> @@ -75,8 +76,7 @@ static bool xen_swiotlb;
>
> static void __init pci_xen_swiotlb_init(void)
> {
> - if (!xen_initial_domain() && !x86_swiotlb_enable &&
> - swiotlb_force != SWIOTLB_FORCE)
> + if (!xen_initial_domain() && !x86_swiotlb_enable)
> return;
> x86_swiotlb_enable = true;
> xen_swiotlb = true;
> @@ -120,8 +120,7 @@ void __init pci_iommu_alloc(void)
> gart_iommu_hole_init();
> amd_iommu_detect();
> detect_intel_iommu();
> - if (x86_swiotlb_enable)
> - swiotlb_init(0);
> + swiotlb_init(x86_swiotlb_enable, x86_swiotlb_flags);
> }
>
> /*
> diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c
> index 485cd06ed39e7..c2da3eb4826e8 100644
> --- a/drivers/xen/swiotlb-xen.c
> +++ b/drivers/xen/swiotlb-xen.c
> @@ -251,7 +251,7 @@ void __init xen_swiotlb_init_early(void)
> panic("%s (rc:%d)", xen_swiotlb_error(XEN_SWIOTLB_EFIXUP), rc);
> }
>
> - if (swiotlb_init_with_tbl(start, nslabs, true))
> + if (swiotlb_init_with_tbl(start, nslabs, SWIOTLB_VERBOSE))
> panic("Cannot allocate SWIOTLB buffer");
> }
> #endif /* CONFIG_X86 */
> @@ -376,7 +376,7 @@ static dma_addr_t xen_swiotlb_map_page(struct device *dev,
> struct page *page,
> /*
> * Oh well, have to allocate and map a bounce buffer.
> */
> - trace_swiotlb_bounced(dev, dev_addr, size, swiotlb_force);
> + trace_swiotlb_bounced(dev, dev_addr, size);
>
> map = swiotlb_tbl_map_single(dev, phys, size, size, 0, dir, attrs);
> if (map == (phys_addr_t)DMA_MAPPING_ERROR)
> diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h
> index b48b26bfa0edb..ae0407173e845 100644
> --- a/include/linux/swiotlb.h
> +++ b/include/linux/swiotlb.h
> @@ -13,11 +13,8 @@ struct device;
> struct page;
> struct scatterlist;
>
> -enum swiotlb_force {
> - SWIOTLB_NORMAL, /* Default - depending on HW DMA mask etc.
> */
> - SWIOTLB_FORCE, /* swiotlb=force */
> - SWIOTLB_NO_FORCE, /* swiotlb=noforce */
> -};
> +#define SWIOTLB_VERBOSE (1 << 0) /* verbose initialization */
> +#define SWIOTLB_FORCE (1 << 1) /* force bounce buffering */
>
> /*
> * Maximum allowable number of contiguous slabs to map,
> @@ -36,8 +33,7 @@ enum swiotlb_force {
> /* default to 64MB */
> #define IO_TLB_DEFAULT_SIZE (64UL<<20)
>
> -extern void swiotlb_init(int verbose);
> -int swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose);
> +int swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, unsigned int flags);
> unsigned long swiotlb_size_or_default(void);
> extern int swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs);
> int swiotlb_init_late(size_t size);
> @@ -126,13 +122,16 @@ static inline bool is_swiotlb_force_bounce(struct device
> *dev)
> return mem && mem->force_bounce;
> }
>
> +void swiotlb_init(bool addressing_limited, unsigned int flags);
> void __init swiotlb_exit(void);
> unsigned int swiotlb_max_segment(void);
> size_t swiotlb_max_mapping_size(struct device *dev);
> bool is_swiotlb_active(struct device *dev);
> void __init swiotlb_adjust_size(unsigned long size);
> #else
> -#define swiotlb_force SWIOTLB_NO_FORCE
> +static inline void swiotlb_init(bool addressing_limited, unsigned int flags)
> +{
> +}
> static inline bool is_swiotlb_buffer(struct device *dev, phys_addr_t paddr)
> {
> return false;
> diff --git a/include/trace/events/swiotlb.h b/include/trace/events/swiotlb.h
> index 705be43b71ab0..da05c9ebd224a 100644
> --- a/include/trace/events/swiotlb.h
> +++ b/include/trace/events/swiotlb.h
> @@ -8,20 +8,15 @@
> #include <linux/tracepoint.h>
>
> TRACE_EVENT(swiotlb_bounced,
> -
> - TP_PROTO(struct device *dev,
> - dma_addr_t dev_addr,
> - size_t size,
> - enum swiotlb_force swiotlb_force),
> -
> - TP_ARGS(dev, dev_addr, size, swiotlb_force),
> + TP_PROTO(struct device *dev, dma_addr_t dev_addr, size_t size),
> + TP_ARGS(dev, dev_addr, size),
>
> TP_STRUCT__entry(
> - __string( dev_name, dev_name(dev) )
> - __field( u64, dma_mask )
> - __field( dma_addr_t, dev_addr )
> - __field( size_t, size )
> - __field( enum swiotlb_force, swiotlb_force )
> + __string(dev_name, dev_name(dev))
> + __field(u64, dma_mask)
> + __field(dma_addr_t, dev_addr)
> + __field(size_t, size)
> + __field(bool, force)
> ),
>
> TP_fast_assign(
> @@ -29,19 +24,15 @@ TRACE_EVENT(swiotlb_bounced,
> __entry->dma_mask = (dev->dma_mask ? *dev->dma_mask : 0);
> __entry->dev_addr = dev_addr;
> __entry->size = size;
> - __entry->swiotlb_force = swiotlb_force;
> + __entry->force = is_swiotlb_force_bounce(dev);
> ),
>
> - TP_printk("dev_name: %s dma_mask=%llx dev_addr=%llx "
> - "size=%zu %s",
> + TP_printk("dev_name: %s dma_mask=%llx dev_addr=%llx size=%zu %s",
> __get_str(dev_name),
> __entry->dma_mask,
> (unsigned long long)__entry->dev_addr,
> __entry->size,
> - __print_symbolic(__entry->swiotlb_force,
> - { SWIOTLB_NORMAL, "NORMAL" },
> - { SWIOTLB_FORCE, "FORCE" },
> - { SWIOTLB_NO_FORCE, "NO_FORCE" }))
> + __entry->force ? "FORCE" : "NORMAL")
> );
>
> #endif /* _TRACE_SWIOTLB_H */
> diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c
> index 9a4fe6e48a074..86e877a96b828 100644
> --- a/kernel/dma/swiotlb.c
> +++ b/kernel/dma/swiotlb.c
> @@ -62,7 +62,8 @@
>
> #define INVALID_PHYS_ADDR (~(phys_addr_t)0)
>
> -enum swiotlb_force swiotlb_force;
> +static bool swiotlb_force_bounce;
> +static bool swiotlb_force_disable;
>
> struct io_tlb_mem io_tlb_default_mem;
>
> @@ -81,9 +82,9 @@ setup_io_tlb_npages(char *str)
> if (*str == ',')
> ++str;
> if (!strcmp(str, "force"))
> - swiotlb_force = SWIOTLB_FORCE;
> + swiotlb_force_bounce = true;
> else if (!strcmp(str, "noforce"))
> - swiotlb_force = SWIOTLB_NO_FORCE;
> + swiotlb_force_disable = true;
>
> return 0;
> }
> @@ -202,7 +203,7 @@ static void swiotlb_init_io_tlb_mem(struct io_tlb_mem *mem,
> phys_addr_t start,
> mem->index = 0;
> mem->late_alloc = late_alloc;
>
> - if (swiotlb_force == SWIOTLB_FORCE)
> + if (swiotlb_force_bounce)
> mem->force_bounce = true;
>
> spin_lock_init(&mem->lock);
> @@ -224,12 +225,13 @@ static void swiotlb_init_io_tlb_mem(struct io_tlb_mem
> *mem, phys_addr_t start,
> return;
> }
>
> -int __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose)
> +int __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs,
> + unsigned int flags)
> {
> struct io_tlb_mem *mem = &io_tlb_default_mem;
> size_t alloc_size;
>
> - if (swiotlb_force == SWIOTLB_NO_FORCE)
> + if (swiotlb_force_disable)
> return 0;
>
> /* protect against double initialization */
> @@ -243,8 +245,9 @@ int __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs,
> int verbose)
> __func__, alloc_size, PAGE_SIZE);
>
> swiotlb_init_io_tlb_mem(mem, __pa(tlb), nslabs, false);
> + mem->force_bounce = flags & SWIOTLB_FORCE;
>
> - if (verbose)
> + if (flags & SWIOTLB_VERBOSE)
> swiotlb_print_info();
> return 0;
> }
> @@ -253,20 +256,21 @@ int __init swiotlb_init_with_tbl(char *tlb, unsigned long
> nslabs, int verbose)
> * Statically reserve bounce buffer space and initialize bounce buffer data
> * structures for the software IO TLB used to implement the DMA API.
> */
> -void __init
> -swiotlb_init(int verbose)
> +void __init swiotlb_init(bool addressing_limit, unsigned int flags)
> {
> size_t bytes = PAGE_ALIGN(default_nslabs << IO_TLB_SHIFT);
> void *tlb;
>
> - if (swiotlb_force == SWIOTLB_NO_FORCE)
> + if (!addressing_limit && !swiotlb_force_bounce)
> + return;
> + if (swiotlb_force_disable)
> return;
>
> /* Get IO TLB memory from the low pages */
> tlb = memblock_alloc_low(bytes, PAGE_SIZE);
> if (!tlb)
> goto fail;
> - if (swiotlb_init_with_tbl(tlb, default_nslabs, verbose))
> + if (swiotlb_init_with_tbl(tlb, default_nslabs, flags))
> goto fail_free_mem;
> return;
>
> @@ -289,7 +293,7 @@ int swiotlb_init_late(size_t size)
> unsigned int order;
> int rc = 0;
>
> - if (swiotlb_force == SWIOTLB_NO_FORCE)
> + if (swiotlb_force_disable)
> return 0;
>
> /*
> @@ -328,7 +332,7 @@ swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs)
> struct io_tlb_mem *mem = &io_tlb_default_mem;
> unsigned long bytes = nslabs << IO_TLB_SHIFT;
>
> - if (swiotlb_force == SWIOTLB_NO_FORCE)
> + if (swiotlb_force_disable)
> return 0;
>
> /* protect against double initialization */
> @@ -353,7 +357,7 @@ void __init swiotlb_exit(void)
> unsigned long tbl_vaddr;
> size_t tbl_size, slots_size;
>
> - if (swiotlb_force == SWIOTLB_FORCE)
> + if (swiotlb_force_bounce)
> return;
>
> if (!mem->nslabs)
> @@ -704,8 +708,7 @@ dma_addr_t swiotlb_map(struct device *dev, phys_addr_t
> paddr, size_t size,
> phys_addr_t swiotlb_addr;
> dma_addr_t dma_addr;
>
> - trace_swiotlb_bounced(dev, phys_to_dma(dev, paddr), size,
> - swiotlb_force);
> + trace_swiotlb_bounced(dev, phys_to_dma(dev, paddr), size);
>
> swiotlb_addr = swiotlb_tbl_map_single(dev, paddr, size, size, 0, dir,
> attrs);
> --
> 2.30.2
^ permalink raw reply [flat|nested] 31+ messages in thread* Re: [PATCH 09/15] swiotlb: make the swiotlb_init interface more useful
2022-04-04 5:05 ` [PATCH 09/15] swiotlb: make the swiotlb_init interface more useful Christoph Hellwig
2022-04-04 17:00 ` Michael Kelley (LINUX)
@ 2022-06-01 17:25 ` Nathan Chancellor
2022-06-01 17:34 ` Christoph Hellwig
1 sibling, 1 reply; 31+ messages in thread
From: Nathan Chancellor @ 2022-06-01 17:25 UTC (permalink / raw)
To: Christoph Hellwig
Cc: iommu, x86, Anshuman Khandual, Tom Lendacky,
Konrad Rzeszutek Wilk, Stefano Stabellini, Boris Ostrovsky,
Juergen Gross, Joerg Roedel, David Woodhouse, Lu Baolu,
Robin Murphy, linux-arm-kernel, xen-devel, linux-ia64,
linux-mips, linuxppc-dev, linux-riscv, linux-s390, linux-hyperv,
tboot-devel, linux-pci
Hi Christoph,
On Mon, Apr 04, 2022 at 07:05:53AM +0200, Christoph Hellwig wrote:
> Pass a bool to pass if swiotlb needs to be enabled based on the
> addressing needs and replace the verbose argument with a set of
> flags, including one to force enable bounce buffering.
>
> Note that this patch removes the possibility to force xen-swiotlb
> use using swiotlb=force on the command line on x86 (arm and arm64
> never supported that), but this interface will be restored shortly.
>
> Signed-off-by: Christoph Hellwig <hch@lst.de>
I bisected a performance regression in WSL2 to this change as commit
c6af2aa9ffc9 ("swiotlb: make the swiotlb_init interface more useful") in
mainline (bisect log below). I initially noticed it because accessing the
Windows filesystem through the /mnt/c mount is about 40x slower if I am doing
my math right based on the benchmarks below.
Before:
$ uname -r; and hyperfine "ls -l /mnt/c/Users/natec/Downloads"
5.18.0-rc3-microsoft-standard-WSL2-00008-ga3e230926708
Benchmark 1: ls -l /mnt/c/Users/natec/Downloads
Time (mean ± σ): 564.5 ms ± 24.1 ms [User: 2.5 ms, System: 130.3 ms]
Range (min … max): 510.2 ms … 588.0 ms 10 runs
After
$ uname -r; and hyperfine "ls -l /mnt/c/Users/natec/Downloads"
5.18.0-rc3-microsoft-standard-WSL2-00009-gc6af2aa9ffc9
Benchmark 1: ls -l /mnt/c/Users/natec/Downloads
Time (mean ± σ): 23.282 s ± 1.220 s [User: 0.013 s, System: 0.101 s]
Range (min … max): 21.793 s … 25.317 s 10 runs
I do see 'swiotlb=force' on the cmdline:
$ cat /proc/cmdline
initrd=\initrd.img panic=-1 nr_cpus=8 swiotlb=force earlycon=uart8250,io,0x3f8,115200 console=hvc0 debug pty.legacy_count=0
/mnt/c appears to be a 9p mount, not sure if that is relevant here:
$ mount &| grep /mnt/c
drvfs on /mnt/c type 9p (rw,noatime,dirsync,aname=drvfs;path=C:\;uid=1000;gid=1000;symlinkroot=/mnt/,mmap,access=client,msize=262144,trans=virtio)
If there is any other information I can provide, please let me know.
Cheers,
Nathan
# bad: [700170bf6b4d773e328fa54ebb70ba444007c702] Merge tag 'nfs-for-5.19-1' of git://git.linux-nfs.org/projects/anna/linux-nfs
# good: [4b0986a3613c92f4ec1bdc7f60ec66fea135991f] Linux 5.18
git bisect start '700170bf6b4d773e328fa54ebb70ba444007c702' 'v5.18'
# good: [86c87bea6b42100c67418af690919c44de6ede6e] Merge tag 'devicetree-for-5.19' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux
git bisect good 86c87bea6b42100c67418af690919c44de6ede6e
# bad: [ae862183285cbb2ef9032770d98ffa9becffe9d5] Merge tag 'arm-dt-5.19' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc
git bisect bad ae862183285cbb2ef9032770d98ffa9becffe9d5
# good: [2518f226c60d8e04d18ba4295500a5b0b8ac7659] Merge tag 'drm-next-2022-05-25' of git://anongit.freedesktop.org/drm/drm
git bisect good 2518f226c60d8e04d18ba4295500a5b0b8ac7659
# bad: [babf0bb978e3c9fce6c4eba6b744c8754fd43d8e] Merge tag 'xfs-5.19-for-linus' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux
git bisect bad babf0bb978e3c9fce6c4eba6b744c8754fd43d8e
# good: [beed983621fbdfd291e6e3a0cdc4d10517e60af8] ASoC: Intel: avs: Machine board registration
git bisect good beed983621fbdfd291e6e3a0cdc4d10517e60af8
# good: [fbe86daca0ba878b04fa241b85e26e54d17d4229] Merge tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi
git bisect good fbe86daca0ba878b04fa241b85e26e54d17d4229
# good: [166afc45ed5523298541fd0297f9ad585cc2708c] Merge tag 'reflink-speedups-5.19_2022-04-28' of git://git.kernel.org/pub/scm/linux/kernel/git/djwong/xfs-linux into xfs-5.19-for-next
git bisect good 166afc45ed5523298541fd0297f9ad585cc2708c
# bad: [e375780b631a5fc2a61a3b4fa12429255361a31e] Merge tag 'fsnotify_for_v5.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs
git bisect bad e375780b631a5fc2a61a3b4fa12429255361a31e
# bad: [4a37f3dd9a83186cb88d44808ab35b78375082c9] dma-direct: don't over-decrypt memory
git bisect bad 4a37f3dd9a83186cb88d44808ab35b78375082c9
# bad: [742519538e6b07250c8085bbff4bd358bc03bf16] swiotlb: pass a gfp_mask argument to swiotlb_init_late
git bisect bad 742519538e6b07250c8085bbff4bd358bc03bf16
# good: [9bbe7a7fc126e3d14fefa4b035854aba080926d9] arm/xen: don't check for xen_initial_domain() in xen_create_contiguous_region
git bisect good 9bbe7a7fc126e3d14fefa4b035854aba080926d9
# good: [a3e230926708125205ffd06d3dc2175a8263ae7e] x86: centralize setting SWIOTLB_FORCE when guest memory encryption is enabled
git bisect good a3e230926708125205ffd06d3dc2175a8263ae7e
# bad: [8ba2ed1be90fc210126f68186564707478552c95] swiotlb: add a SWIOTLB_ANY flag to lift the low memory restriction
git bisect bad 8ba2ed1be90fc210126f68186564707478552c95
# bad: [c6af2aa9ffc9763826607bc2664ef3ea4475ed18] swiotlb: make the swiotlb_init interface more useful
git bisect bad c6af2aa9ffc9763826607bc2664ef3ea4475ed18
# first bad commit: [c6af2aa9ffc9763826607bc2664ef3ea4475ed18] swiotlb: make the swiotlb_init interface more useful
^ permalink raw reply [flat|nested] 31+ messages in thread* Re: [PATCH 09/15] swiotlb: make the swiotlb_init interface more useful
2022-06-01 17:25 ` Nathan Chancellor
@ 2022-06-01 17:34 ` Christoph Hellwig
[not found] ` <YpemDuzdoaO3rijX@Ryzen-9-3900X.>
0 siblings, 1 reply; 31+ messages in thread
From: Christoph Hellwig @ 2022-06-01 17:34 UTC (permalink / raw)
To: Nathan Chancellor
Cc: Christoph Hellwig, iommu, x86, Anshuman Khandual, Tom Lendacky,
Konrad Rzeszutek Wilk, Stefano Stabellini, Boris Ostrovsky,
Juergen Gross, Joerg Roedel, David Woodhouse, Lu Baolu,
Robin Murphy, linux-arm-kernel, xen-devel, linux-ia64,
linux-mips, linuxppc-dev, linux-riscv, linux-s390, linux-hyperv,
tboot-devel, linux-pci
Can you send me the full dmesg and the content of
/sys/kernel/debug/swiotlb/io_tlb_nslabs for a good and a bad boot?
Thanks!
^ permalink raw reply [flat|nested] 31+ messages in thread
* [PATCH 10/15] swiotlb: add a SWIOTLB_ANY flag to lift the low memory restriction
2022-04-04 5:05 cleanup swiotlb initialization v8 Christoph Hellwig
` (8 preceding siblings ...)
2022-04-04 5:05 ` [PATCH 09/15] swiotlb: make the swiotlb_init interface more useful Christoph Hellwig
@ 2022-04-04 5:05 ` Christoph Hellwig
2022-04-07 0:25 ` Konrad Rzeszutek Wilk
2022-04-04 5:05 ` [PATCH 11/15] swiotlb: pass a gfp_mask argument to swiotlb_init_late Christoph Hellwig
` (8 subsequent siblings)
18 siblings, 1 reply; 31+ messages in thread
From: Christoph Hellwig @ 2022-04-04 5:05 UTC (permalink / raw)
To: iommu
Cc: x86, Anshuman Khandual, Tom Lendacky, Konrad Rzeszutek Wilk,
Stefano Stabellini, Boris Ostrovsky, Juergen Gross, Joerg Roedel,
David Woodhouse, Lu Baolu, Robin Murphy, linux-arm-kernel,
xen-devel, linux-ia64, linux-mips, linuxppc-dev, linux-riscv,
linux-s390, linux-hyperv, tboot-devel, linux-pci
Power SVM wants to allocate a swiotlb buffer that is not restricted to
low memory for the trusted hypervisor scheme. Consolidate the support
for this into the swiotlb_init interface by adding a new flag.
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
arch/powerpc/include/asm/svm.h | 4 ----
arch/powerpc/include/asm/swiotlb.h | 1 +
arch/powerpc/kernel/dma-swiotlb.c | 1 +
arch/powerpc/mm/mem.c | 5 +----
arch/powerpc/platforms/pseries/svm.c | 26 +-------------------------
include/linux/swiotlb.h | 1 +
kernel/dma/swiotlb.c | 11 +++++++++--
7 files changed, 14 insertions(+), 35 deletions(-)
diff --git a/arch/powerpc/include/asm/svm.h b/arch/powerpc/include/asm/svm.h
index 7546402d796af..85580b30aba48 100644
--- a/arch/powerpc/include/asm/svm.h
+++ b/arch/powerpc/include/asm/svm.h
@@ -15,8 +15,6 @@ static inline bool is_secure_guest(void)
return mfmsr() & MSR_S;
}
-void __init svm_swiotlb_init(void);
-
void dtl_cache_ctor(void *addr);
#define get_dtl_cache_ctor() (is_secure_guest() ? dtl_cache_ctor : NULL)
@@ -27,8 +25,6 @@ static inline bool is_secure_guest(void)
return false;
}
-static inline void svm_swiotlb_init(void) {}
-
#define get_dtl_cache_ctor() NULL
#endif /* CONFIG_PPC_SVM */
diff --git a/arch/powerpc/include/asm/swiotlb.h b/arch/powerpc/include/asm/swiotlb.h
index 3c1a1cd161286..4203b5e0a88ed 100644
--- a/arch/powerpc/include/asm/swiotlb.h
+++ b/arch/powerpc/include/asm/swiotlb.h
@@ -9,6 +9,7 @@
#include <linux/swiotlb.h>
extern unsigned int ppc_swiotlb_enable;
+extern unsigned int ppc_swiotlb_flags;
#ifdef CONFIG_SWIOTLB
void swiotlb_detect_4g(void);
diff --git a/arch/powerpc/kernel/dma-swiotlb.c b/arch/powerpc/kernel/dma-swiotlb.c
index fc7816126a401..ba256c37bcc0f 100644
--- a/arch/powerpc/kernel/dma-swiotlb.c
+++ b/arch/powerpc/kernel/dma-swiotlb.c
@@ -10,6 +10,7 @@
#include <asm/swiotlb.h>
unsigned int ppc_swiotlb_enable;
+unsigned int ppc_swiotlb_flags;
void __init swiotlb_detect_4g(void)
{
diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
index e1519e2edc656..a4d65418c30a9 100644
--- a/arch/powerpc/mm/mem.c
+++ b/arch/powerpc/mm/mem.c
@@ -249,10 +249,7 @@ void __init mem_init(void)
* back to to-down.
*/
memblock_set_bottom_up(true);
- if (is_secure_guest())
- svm_swiotlb_init();
- else
- swiotlb_init(ppc_swiotlb_enable, 0);
+ swiotlb_init(ppc_swiotlb_enable, ppc_swiotlb_flags);
#endif
high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
diff --git a/arch/powerpc/platforms/pseries/svm.c b/arch/powerpc/platforms/pseries/svm.c
index c5228f4969eb2..3b4045d508ec8 100644
--- a/arch/powerpc/platforms/pseries/svm.c
+++ b/arch/powerpc/platforms/pseries/svm.c
@@ -28,7 +28,7 @@ static int __init init_svm(void)
* need to use the SWIOTLB buffer for DMA even if dma_capable() says
* otherwise.
*/
- swiotlb_force = SWIOTLB_FORCE;
+ ppc_swiotlb_flags |= SWIOTLB_ANY | SWIOTLB_FORCE;
/* Share the SWIOTLB buffer with the host. */
swiotlb_update_mem_attributes();
@@ -37,30 +37,6 @@ static int __init init_svm(void)
}
machine_early_initcall(pseries, init_svm);
-/*
- * Initialize SWIOTLB. Essentially the same as swiotlb_init(), except that it
- * can allocate the buffer anywhere in memory. Since the hypervisor doesn't have
- * any addressing limitation, we don't need to allocate it in low addresses.
- */
-void __init svm_swiotlb_init(void)
-{
- unsigned char *vstart;
- unsigned long bytes, io_tlb_nslabs;
-
- io_tlb_nslabs = (swiotlb_size_or_default() >> IO_TLB_SHIFT);
- io_tlb_nslabs = ALIGN(io_tlb_nslabs, IO_TLB_SEGSIZE);
-
- bytes = io_tlb_nslabs << IO_TLB_SHIFT;
-
- vstart = memblock_alloc(PAGE_ALIGN(bytes), PAGE_SIZE);
- if (vstart && !swiotlb_init_with_tbl(vstart, io_tlb_nslabs, false))
- return;
-
-
- memblock_free(vstart, PAGE_ALIGN(io_tlb_nslabs << IO_TLB_SHIFT));
- panic("SVM: Cannot allocate SWIOTLB buffer");
-}
-
int set_memory_encrypted(unsigned long addr, int numpages)
{
if (!cc_platform_has(CC_ATTR_MEM_ENCRYPT))
diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h
index ae0407173e845..eabdd89987027 100644
--- a/include/linux/swiotlb.h
+++ b/include/linux/swiotlb.h
@@ -15,6 +15,7 @@ struct scatterlist;
#define SWIOTLB_VERBOSE (1 << 0) /* verbose initialization */
#define SWIOTLB_FORCE (1 << 1) /* force bounce buffering */
+#define SWIOTLB_ANY (1 << 2) /* allow any memory for the buffer */
/*
* Maximum allowable number of contiguous slabs to map,
diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c
index 86e877a96b828..f6e091424af3d 100644
--- a/kernel/dma/swiotlb.c
+++ b/kernel/dma/swiotlb.c
@@ -266,8 +266,15 @@ void __init swiotlb_init(bool addressing_limit, unsigned int flags)
if (swiotlb_force_disable)
return;
- /* Get IO TLB memory from the low pages */
- tlb = memblock_alloc_low(bytes, PAGE_SIZE);
+ /*
+ * By default allocate the bounce buffer memory from low memory, but
+ * allow to pick a location everywhere for hypervisors with guest
+ * memory encryption.
+ */
+ if (flags & SWIOTLB_ANY)
+ tlb = memblock_alloc(bytes, PAGE_SIZE);
+ else
+ tlb = memblock_alloc_low(bytes, PAGE_SIZE);
if (!tlb)
goto fail;
if (swiotlb_init_with_tbl(tlb, default_nslabs, flags))
--
2.30.2
^ permalink raw reply related [flat|nested] 31+ messages in thread* Re: [PATCH 10/15] swiotlb: add a SWIOTLB_ANY flag to lift the low memory restriction
2022-04-04 5:05 ` [PATCH 10/15] swiotlb: add a SWIOTLB_ANY flag to lift the low memory restriction Christoph Hellwig
@ 2022-04-07 0:25 ` Konrad Rzeszutek Wilk
2022-04-12 6:21 ` Christoph Hellwig
0 siblings, 1 reply; 31+ messages in thread
From: Konrad Rzeszutek Wilk @ 2022-04-07 0:25 UTC (permalink / raw)
To: Christoph Hellwig
Cc: iommu, x86, Anshuman Khandual, Tom Lendacky, Stefano Stabellini,
Boris Ostrovsky, Juergen Gross, Joerg Roedel, David Woodhouse,
Lu Baolu, Robin Murphy, linux-arm-kernel, xen-devel, linux-ia64,
linux-mips, linuxppc-dev, linux-riscv, linux-s390, linux-hyperv,
tboot-devel, linux-pci
> diff --git a/arch/powerpc/platforms/pseries/svm.c b/arch/powerpc/platforms/pseries/svm.c
> index c5228f4969eb2..3b4045d508ec8 100644
> --- a/arch/powerpc/platforms/pseries/svm.c
> +++ b/arch/powerpc/platforms/pseries/svm.c
> @@ -28,7 +28,7 @@ static int __init init_svm(void)
> * need to use the SWIOTLB buffer for DMA even if dma_capable() says
> * otherwise.
> */
> - swiotlb_force = SWIOTLB_FORCE;
> + ppc_swiotlb_flags |= SWIOTLB_ANY | SWIOTLB_FORCE;
This is the only place you set the ppc_swiotlb_flags.. so I wonder why
the '|=' instead of just '=' ?
Either way:
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Thank you!
^ permalink raw reply [flat|nested] 31+ messages in thread
* Re: [PATCH 10/15] swiotlb: add a SWIOTLB_ANY flag to lift the low memory restriction
2022-04-07 0:25 ` Konrad Rzeszutek Wilk
@ 2022-04-12 6:21 ` Christoph Hellwig
0 siblings, 0 replies; 31+ messages in thread
From: Christoph Hellwig @ 2022-04-12 6:21 UTC (permalink / raw)
To: Konrad Rzeszutek Wilk
Cc: Christoph Hellwig, iommu, x86, Anshuman Khandual, Tom Lendacky,
Stefano Stabellini, Boris Ostrovsky, Juergen Gross, Joerg Roedel,
David Woodhouse, Lu Baolu, Robin Murphy, linux-arm-kernel,
xen-devel, linux-ia64, linux-mips, linuxppc-dev, linux-riscv,
linux-s390, linux-hyperv, tboot-devel, linux-pci
On Wed, Apr 06, 2022 at 08:25:32PM -0400, Konrad Rzeszutek Wilk wrote:
> > diff --git a/arch/powerpc/platforms/pseries/svm.c b/arch/powerpc/platforms/pseries/svm.c
> > index c5228f4969eb2..3b4045d508ec8 100644
> > --- a/arch/powerpc/platforms/pseries/svm.c
> > +++ b/arch/powerpc/platforms/pseries/svm.c
> > @@ -28,7 +28,7 @@ static int __init init_svm(void)
> > * need to use the SWIOTLB buffer for DMA even if dma_capable() says
> > * otherwise.
> > */
> > - swiotlb_force = SWIOTLB_FORCE;
> > + ppc_swiotlb_flags |= SWIOTLB_ANY | SWIOTLB_FORCE;
>
> This is the only place you set the ppc_swiotlb_flags.. so I wonder why
> the '|=' instead of just '=' ?
Preparing for setting others and not clobbering the value.
^ permalink raw reply [flat|nested] 31+ messages in thread
* [PATCH 11/15] swiotlb: pass a gfp_mask argument to swiotlb_init_late
2022-04-04 5:05 cleanup swiotlb initialization v8 Christoph Hellwig
` (9 preceding siblings ...)
2022-04-04 5:05 ` [PATCH 10/15] swiotlb: add a SWIOTLB_ANY flag to lift the low memory restriction Christoph Hellwig
@ 2022-04-04 5:05 ` Christoph Hellwig
2022-04-04 5:05 ` [PATCH 12/15] swiotlb: provide swiotlb_init variants that remap the buffer Christoph Hellwig
` (7 subsequent siblings)
18 siblings, 0 replies; 31+ messages in thread
From: Christoph Hellwig @ 2022-04-04 5:05 UTC (permalink / raw)
To: iommu
Cc: x86, Anshuman Khandual, Tom Lendacky, Konrad Rzeszutek Wilk,
Stefano Stabellini, Boris Ostrovsky, Juergen Gross, Joerg Roedel,
David Woodhouse, Lu Baolu, Robin Murphy, linux-arm-kernel,
xen-devel, linux-ia64, linux-mips, linuxppc-dev, linux-riscv,
linux-s390, linux-hyperv, tboot-devel, linux-pci
Let the caller chose a zone to allocate from. This will be used
later on by the xen-swiotlb initialization on arm.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
---
arch/x86/pci/sta2x11-fixup.c | 2 +-
include/linux/swiotlb.h | 2 +-
kernel/dma/swiotlb.c | 7 ++-----
3 files changed, 4 insertions(+), 7 deletions(-)
diff --git a/arch/x86/pci/sta2x11-fixup.c b/arch/x86/pci/sta2x11-fixup.c
index e0c039a75b2db..c7e6faf59a861 100644
--- a/arch/x86/pci/sta2x11-fixup.c
+++ b/arch/x86/pci/sta2x11-fixup.c
@@ -57,7 +57,7 @@ static void sta2x11_new_instance(struct pci_dev *pdev)
int size = STA2X11_SWIOTLB_SIZE;
/* First instance: register your own swiotlb area */
dev_info(&pdev->dev, "Using SWIOTLB (size %i)\n", size);
- if (swiotlb_init_late(size))
+ if (swiotlb_init_late(size, GFP_DMA))
dev_emerg(&pdev->dev, "init swiotlb failed\n");
}
list_add(&instance->list, &sta2x11_instance_list);
diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h
index eabdd89987027..ee655f2e4d28b 100644
--- a/include/linux/swiotlb.h
+++ b/include/linux/swiotlb.h
@@ -37,7 +37,7 @@ struct scatterlist;
int swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, unsigned int flags);
unsigned long swiotlb_size_or_default(void);
extern int swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs);
-int swiotlb_init_late(size_t size);
+int swiotlb_init_late(size_t size, gfp_t gfp_mask);
extern void __init swiotlb_update_mem_attributes(void);
phys_addr_t swiotlb_tbl_map_single(struct device *hwdev, phys_addr_t phys,
diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c
index f6e091424af3d..119187afc65ec 100644
--- a/kernel/dma/swiotlb.c
+++ b/kernel/dma/swiotlb.c
@@ -292,7 +292,7 @@ void __init swiotlb_init(bool addressing_limit, unsigned int flags)
* initialize the swiotlb later using the slab allocator if needed.
* This should be just like above, but with some error catching.
*/
-int swiotlb_init_late(size_t size)
+int swiotlb_init_late(size_t size, gfp_t gfp_mask)
{
unsigned long nslabs = ALIGN(size >> IO_TLB_SHIFT, IO_TLB_SEGSIZE);
unsigned long bytes;
@@ -303,15 +303,12 @@ int swiotlb_init_late(size_t size)
if (swiotlb_force_disable)
return 0;
- /*
- * Get IO TLB memory from the low pages
- */
order = get_order(nslabs << IO_TLB_SHIFT);
nslabs = SLABS_PER_PAGE << order;
bytes = nslabs << IO_TLB_SHIFT;
while ((SLABS_PER_PAGE << order) > IO_TLB_MIN_SLABS) {
- vstart = (void *)__get_free_pages(GFP_DMA | __GFP_NOWARN,
+ vstart = (void *)__get_free_pages(gfp_mask | __GFP_NOWARN,
order);
if (vstart)
break;
--
2.30.2
^ permalink raw reply related [flat|nested] 31+ messages in thread* [PATCH 12/15] swiotlb: provide swiotlb_init variants that remap the buffer
2022-04-04 5:05 cleanup swiotlb initialization v8 Christoph Hellwig
` (10 preceding siblings ...)
2022-04-04 5:05 ` [PATCH 11/15] swiotlb: pass a gfp_mask argument to swiotlb_init_late Christoph Hellwig
@ 2022-04-04 5:05 ` Christoph Hellwig
2022-04-04 7:09 ` Dongli Zhang
2022-04-04 5:05 ` [PATCH 13/15] swiotlb: merge swiotlb-xen initialization into swiotlb Christoph Hellwig
` (6 subsequent siblings)
18 siblings, 1 reply; 31+ messages in thread
From: Christoph Hellwig @ 2022-04-04 5:05 UTC (permalink / raw)
To: iommu
Cc: x86, Anshuman Khandual, Tom Lendacky, Konrad Rzeszutek Wilk,
Stefano Stabellini, Boris Ostrovsky, Juergen Gross, Joerg Roedel,
David Woodhouse, Lu Baolu, Robin Murphy, linux-arm-kernel,
xen-devel, linux-ia64, linux-mips, linuxppc-dev, linux-riscv,
linux-s390, linux-hyperv, tboot-devel, linux-pci
To shared more code between swiotlb and xen-swiotlb, offer a
swiotlb_init_remap interface and add a remap callback to
swiotlb_init_late that will allow Xen to remap the buffer the
buffer without duplicating much of the logic.
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
arch/x86/pci/sta2x11-fixup.c | 2 +-
include/linux/swiotlb.h | 5 ++++-
kernel/dma/swiotlb.c | 36 +++++++++++++++++++++++++++++++++---
3 files changed, 38 insertions(+), 5 deletions(-)
diff --git a/arch/x86/pci/sta2x11-fixup.c b/arch/x86/pci/sta2x11-fixup.c
index c7e6faf59a861..7368afc039987 100644
--- a/arch/x86/pci/sta2x11-fixup.c
+++ b/arch/x86/pci/sta2x11-fixup.c
@@ -57,7 +57,7 @@ static void sta2x11_new_instance(struct pci_dev *pdev)
int size = STA2X11_SWIOTLB_SIZE;
/* First instance: register your own swiotlb area */
dev_info(&pdev->dev, "Using SWIOTLB (size %i)\n", size);
- if (swiotlb_init_late(size, GFP_DMA))
+ if (swiotlb_init_late(size, GFP_DMA, NULL))
dev_emerg(&pdev->dev, "init swiotlb failed\n");
}
list_add(&instance->list, &sta2x11_instance_list);
diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h
index ee655f2e4d28b..7b50c82f84ce9 100644
--- a/include/linux/swiotlb.h
+++ b/include/linux/swiotlb.h
@@ -36,8 +36,11 @@ struct scatterlist;
int swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, unsigned int flags);
unsigned long swiotlb_size_or_default(void);
+void __init swiotlb_init_remap(bool addressing_limit, unsigned int flags,
+ int (*remap)(void *tlb, unsigned long nslabs));
+int swiotlb_init_late(size_t size, gfp_t gfp_mask,
+ int (*remap)(void *tlb, unsigned long nslabs));
extern int swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs);
-int swiotlb_init_late(size_t size, gfp_t gfp_mask);
extern void __init swiotlb_update_mem_attributes(void);
phys_addr_t swiotlb_tbl_map_single(struct device *hwdev, phys_addr_t phys,
diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c
index 119187afc65ec..d5fe8f5e08300 100644
--- a/kernel/dma/swiotlb.c
+++ b/kernel/dma/swiotlb.c
@@ -256,9 +256,11 @@ int __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs,
* Statically reserve bounce buffer space and initialize bounce buffer data
* structures for the software IO TLB used to implement the DMA API.
*/
-void __init swiotlb_init(bool addressing_limit, unsigned int flags)
+void __init swiotlb_init_remap(bool addressing_limit, unsigned int flags,
+ int (*remap)(void *tlb, unsigned long nslabs))
{
- size_t bytes = PAGE_ALIGN(default_nslabs << IO_TLB_SHIFT);
+ unsigned long nslabs = default_nslabs;
+ size_t bytes;
void *tlb;
if (!addressing_limit && !swiotlb_force_bounce)
@@ -271,12 +273,23 @@ void __init swiotlb_init(bool addressing_limit, unsigned int flags)
* allow to pick a location everywhere for hypervisors with guest
* memory encryption.
*/
+retry:
+ bytes = PAGE_ALIGN(default_nslabs << IO_TLB_SHIFT);
if (flags & SWIOTLB_ANY)
tlb = memblock_alloc(bytes, PAGE_SIZE);
else
tlb = memblock_alloc_low(bytes, PAGE_SIZE);
if (!tlb)
goto fail;
+ if (remap && remap(tlb, nslabs) < 0) {
+ memblock_free(tlb, PAGE_ALIGN(bytes));
+
+ nslabs = ALIGN(nslabs >> 1, IO_TLB_SEGSIZE);
+ if (nslabs < IO_TLB_MIN_SLABS)
+ panic("%s: Failed to remap %zu bytes\n",
+ __func__, bytes);
+ goto retry;
+ }
if (swiotlb_init_with_tbl(tlb, default_nslabs, flags))
goto fail_free_mem;
return;
@@ -287,12 +300,18 @@ void __init swiotlb_init(bool addressing_limit, unsigned int flags)
pr_warn("Cannot allocate buffer");
}
+void __init swiotlb_init(bool addressing_limit, unsigned int flags)
+{
+ return swiotlb_init_remap(addressing_limit, flags, NULL);
+}
+
/*
* Systems with larger DMA zones (those that don't support ISA) can
* initialize the swiotlb later using the slab allocator if needed.
* This should be just like above, but with some error catching.
*/
-int swiotlb_init_late(size_t size, gfp_t gfp_mask)
+int swiotlb_init_late(size_t size, gfp_t gfp_mask,
+ int (*remap)(void *tlb, unsigned long nslabs))
{
unsigned long nslabs = ALIGN(size >> IO_TLB_SHIFT, IO_TLB_SEGSIZE);
unsigned long bytes;
@@ -303,6 +322,7 @@ int swiotlb_init_late(size_t size, gfp_t gfp_mask)
if (swiotlb_force_disable)
return 0;
+retry:
order = get_order(nslabs << IO_TLB_SHIFT);
nslabs = SLABS_PER_PAGE << order;
bytes = nslabs << IO_TLB_SHIFT;
@@ -323,6 +343,16 @@ int swiotlb_init_late(size_t size, gfp_t gfp_mask)
(PAGE_SIZE << order) >> 20);
nslabs = SLABS_PER_PAGE << order;
}
+ if (remap)
+ rc = remap(vstart, nslabs);
+ if (rc) {
+ free_pages((unsigned long)vstart, order);
+
+ nslabs = ALIGN(nslabs >> 1, IO_TLB_SEGSIZE);
+ if (nslabs < IO_TLB_MIN_SLABS)
+ return rc;
+ goto retry;
+ }
rc = swiotlb_late_init_with_tbl(vstart, nslabs);
if (rc)
free_pages((unsigned long)vstart, order);
--
2.30.2
^ permalink raw reply related [flat|nested] 31+ messages in thread* Re: [PATCH 12/15] swiotlb: provide swiotlb_init variants that remap the buffer
2022-04-04 5:05 ` [PATCH 12/15] swiotlb: provide swiotlb_init variants that remap the buffer Christoph Hellwig
@ 2022-04-04 7:09 ` Dongli Zhang
0 siblings, 0 replies; 31+ messages in thread
From: Dongli Zhang @ 2022-04-04 7:09 UTC (permalink / raw)
To: Christoph Hellwig, iommu
Cc: x86, Anshuman Khandual, Tom Lendacky, Konrad Rzeszutek Wilk,
Stefano Stabellini, Boris Ostrovsky, Juergen Gross, Joerg Roedel,
David Woodhouse, Lu Baolu, Robin Murphy, linux-arm-kernel,
xen-devel, linux-ia64, linux-mips, linuxppc-dev, linux-riscv,
linux-s390, linux-hyperv, tboot-devel, linux-pci
On 4/3/22 10:05 PM, Christoph Hellwig wrote:
> To shared more code between swiotlb and xen-swiotlb, offer a
> swiotlb_init_remap interface and add a remap callback to
> swiotlb_init_late that will allow Xen to remap the buffer the
> buffer without duplicating much of the logic.
>
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
> arch/x86/pci/sta2x11-fixup.c | 2 +-
> include/linux/swiotlb.h | 5 ++++-
> kernel/dma/swiotlb.c | 36 +++++++++++++++++++++++++++++++++---
> 3 files changed, 38 insertions(+), 5 deletions(-)
>
> diff --git a/arch/x86/pci/sta2x11-fixup.c b/arch/x86/pci/sta2x11-fixup.c
> index c7e6faf59a861..7368afc039987 100644
> --- a/arch/x86/pci/sta2x11-fixup.c
> +++ b/arch/x86/pci/sta2x11-fixup.c
> @@ -57,7 +57,7 @@ static void sta2x11_new_instance(struct pci_dev *pdev)
> int size = STA2X11_SWIOTLB_SIZE;
> /* First instance: register your own swiotlb area */
> dev_info(&pdev->dev, "Using SWIOTLB (size %i)\n", size);
> - if (swiotlb_init_late(size, GFP_DMA))
> + if (swiotlb_init_late(size, GFP_DMA, NULL))
> dev_emerg(&pdev->dev, "init swiotlb failed\n");
> }
> list_add(&instance->list, &sta2x11_instance_list);
> diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h
> index ee655f2e4d28b..7b50c82f84ce9 100644
> --- a/include/linux/swiotlb.h
> +++ b/include/linux/swiotlb.h
> @@ -36,8 +36,11 @@ struct scatterlist;
>
> int swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, unsigned int flags);
> unsigned long swiotlb_size_or_default(void);
> +void __init swiotlb_init_remap(bool addressing_limit, unsigned int flags,
> + int (*remap)(void *tlb, unsigned long nslabs));
> +int swiotlb_init_late(size_t size, gfp_t gfp_mask,
> + int (*remap)(void *tlb, unsigned long nslabs));
> extern int swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs);
> -int swiotlb_init_late(size_t size, gfp_t gfp_mask);
> extern void __init swiotlb_update_mem_attributes(void);
>
> phys_addr_t swiotlb_tbl_map_single(struct device *hwdev, phys_addr_t phys,
> diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c
> index 119187afc65ec..d5fe8f5e08300 100644
> --- a/kernel/dma/swiotlb.c
> +++ b/kernel/dma/swiotlb.c
> @@ -256,9 +256,11 @@ int __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs,
> * Statically reserve bounce buffer space and initialize bounce buffer data
> * structures for the software IO TLB used to implement the DMA API.
> */
> -void __init swiotlb_init(bool addressing_limit, unsigned int flags)
> +void __init swiotlb_init_remap(bool addressing_limit, unsigned int flags,
> + int (*remap)(void *tlb, unsigned long nslabs))
> {
> - size_t bytes = PAGE_ALIGN(default_nslabs << IO_TLB_SHIFT);
> + unsigned long nslabs = default_nslabs;
> + size_t bytes;
> void *tlb;
>
> if (!addressing_limit && !swiotlb_force_bounce)
> @@ -271,12 +273,23 @@ void __init swiotlb_init(bool addressing_limit, unsigned int flags)
> * allow to pick a location everywhere for hypervisors with guest
> * memory encryption.
> */
> +retry:
> + bytes = PAGE_ALIGN(default_nslabs << IO_TLB_SHIFT);
> if (flags & SWIOTLB_ANY)
> tlb = memblock_alloc(bytes, PAGE_SIZE);
> else
> tlb = memblock_alloc_low(bytes, PAGE_SIZE);
> if (!tlb)
> goto fail;
> + if (remap && remap(tlb, nslabs) < 0) {
> + memblock_free(tlb, PAGE_ALIGN(bytes));
> +
> + nslabs = ALIGN(nslabs >> 1, IO_TLB_SEGSIZE);
> + if (nslabs < IO_TLB_MIN_SLABS)
> + panic("%s: Failed to remap %zu bytes\n",
> + __func__, bytes);
> + goto retry;
> + }
> if (swiotlb_init_with_tbl(tlb, default_nslabs, flags))
> goto fail_free_mem;
> return;
> @@ -287,12 +300,18 @@ void __init swiotlb_init(bool addressing_limit, unsigned int flags)
> pr_warn("Cannot allocate buffer");
> }
>
> +void __init swiotlb_init(bool addressing_limit, unsigned int flags)
> +{
> + return swiotlb_init_remap(addressing_limit, flags, NULL);
> +}
> +
> /*
> * Systems with larger DMA zones (those that don't support ISA) can
> * initialize the swiotlb later using the slab allocator if needed.
> * This should be just like above, but with some error catching.
> */
> -int swiotlb_init_late(size_t size, gfp_t gfp_mask)
> +int swiotlb_init_late(size_t size, gfp_t gfp_mask,
> + int (*remap)(void *tlb, unsigned long nslabs))
> {
> unsigned long nslabs = ALIGN(size >> IO_TLB_SHIFT, IO_TLB_SEGSIZE);
> unsigned long bytes;
> @@ -303,6 +322,7 @@ int swiotlb_init_late(size_t size, gfp_t gfp_mask)
> if (swiotlb_force_disable)
> return 0;
>
> +retry:
> order = get_order(nslabs << IO_TLB_SHIFT);
> nslabs = SLABS_PER_PAGE << order;
> bytes = nslabs << IO_TLB_SHIFT;
> @@ -323,6 +343,16 @@ int swiotlb_init_late(size_t size, gfp_t gfp_mask)
> (PAGE_SIZE << order) >> 20);
> nslabs = SLABS_PER_PAGE << order;
> }
> + if (remap)
> + rc = remap(vstart, nslabs);
> + if (rc) {
> + free_pages((unsigned long)vstart, order);
> +
"warning: 1 line adds whitespace errors." above when I was applying the patch
for test.
Dongli Zhang
> + nslabs = ALIGN(nslabs >> 1, IO_TLB_SEGSIZE);
> + if (nslabs < IO_TLB_MIN_SLABS)
> + return rc;
> + goto retry;
> + }
> rc = swiotlb_late_init_with_tbl(vstart, nslabs);
> if (rc)
> free_pages((unsigned long)vstart, order);
>
^ permalink raw reply [flat|nested] 31+ messages in thread
* [PATCH 13/15] swiotlb: merge swiotlb-xen initialization into swiotlb
2022-04-04 5:05 cleanup swiotlb initialization v8 Christoph Hellwig
` (11 preceding siblings ...)
2022-04-04 5:05 ` [PATCH 12/15] swiotlb: provide swiotlb_init variants that remap the buffer Christoph Hellwig
@ 2022-04-04 5:05 ` Christoph Hellwig
2022-04-04 5:05 ` [PATCH 14/15] swiotlb: remove swiotlb_init_with_tbl and swiotlb_init_late_with_tbl Christoph Hellwig
` (5 subsequent siblings)
18 siblings, 0 replies; 31+ messages in thread
From: Christoph Hellwig @ 2022-04-04 5:05 UTC (permalink / raw)
To: iommu
Cc: x86, Anshuman Khandual, Tom Lendacky, Konrad Rzeszutek Wilk,
Stefano Stabellini, Boris Ostrovsky, Juergen Gross, Joerg Roedel,
David Woodhouse, Lu Baolu, Robin Murphy, linux-arm-kernel,
xen-devel, linux-ia64, linux-mips, linuxppc-dev, linux-riscv,
linux-s390, linux-hyperv, tboot-devel, linux-pci
Reuse the generic swiotlb initialization for xen-swiotlb. For ARM/ARM64
this works trivially, while for x86 xen_swiotlb_fixup needs to be passed
as the remap argument to swiotlb_init_remap/swiotlb_init_late.
Note that the lower bound of the swiotlb size is changed to the smaller
IO_TLB_MIN_SLABS based value with this patch, but that is fine as the
2MB value used in Xen before was just an optimization and is not the
hard lower bound.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
---
arch/arm/xen/mm.c | 21 +++---
arch/x86/include/asm/xen/page.h | 5 --
arch/x86/kernel/pci-dma.c | 20 ++---
drivers/xen/swiotlb-xen.c | 128 +-------------------------------
include/xen/arm/page.h | 1 -
include/xen/swiotlb-xen.h | 8 +-
6 files changed, 28 insertions(+), 155 deletions(-)
diff --git a/arch/arm/xen/mm.c b/arch/arm/xen/mm.c
index 28c2070602535..ff05a7899cb86 100644
--- a/arch/arm/xen/mm.c
+++ b/arch/arm/xen/mm.c
@@ -23,22 +23,20 @@
#include <asm/xen/hypercall.h>
#include <asm/xen/interface.h>
-unsigned long xen_get_swiotlb_free_pages(unsigned int order)
+static gfp_t xen_swiotlb_gfp(void)
{
phys_addr_t base;
- gfp_t flags = __GFP_NOWARN|__GFP_KSWAPD_RECLAIM;
u64 i;
for_each_mem_range(i, &base, NULL) {
if (base < (phys_addr_t)0xffffffff) {
if (IS_ENABLED(CONFIG_ZONE_DMA32))
- flags |= __GFP_DMA32;
- else
- flags |= __GFP_DMA;
- break;
+ return __GFP_DMA32;
+ return __GFP_DMA;
}
}
- return __get_free_pages(flags, order);
+
+ return GFP_KERNEL;
}
static bool hypercall_cflush = false;
@@ -140,10 +138,13 @@ static int __init xen_mm_init(void)
if (!xen_swiotlb_detect())
return 0;
- rc = xen_swiotlb_init();
/* we can work with the default swiotlb */
- if (rc < 0 && rc != -EEXIST)
- return rc;
+ if (!io_tlb_default_mem.nslabs) {
+ rc = swiotlb_init_late(swiotlb_size_or_default(),
+ xen_swiotlb_gfp(), NULL);
+ if (rc < 0)
+ return rc;
+ }
cflush.op = 0;
cflush.a.dev_bus_addr = 0;
diff --git a/arch/x86/include/asm/xen/page.h b/arch/x86/include/asm/xen/page.h
index e989bc2269f54..1fc67df500145 100644
--- a/arch/x86/include/asm/xen/page.h
+++ b/arch/x86/include/asm/xen/page.h
@@ -357,9 +357,4 @@ static inline bool xen_arch_need_swiotlb(struct device *dev,
return false;
}
-static inline unsigned long xen_get_swiotlb_free_pages(unsigned int order)
-{
- return __get_free_pages(__GFP_NOWARN, order);
-}
-
#endif /* _ASM_X86_XEN_PAGE_H */
diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c
index a705a199bf8a3..30bbe4abb5d61 100644
--- a/arch/x86/kernel/pci-dma.c
+++ b/arch/x86/kernel/pci-dma.c
@@ -72,15 +72,13 @@ static inline void __init pci_swiotlb_detect(void)
#endif /* CONFIG_SWIOTLB */
#ifdef CONFIG_SWIOTLB_XEN
-static bool xen_swiotlb;
-
static void __init pci_xen_swiotlb_init(void)
{
if (!xen_initial_domain() && !x86_swiotlb_enable)
return;
x86_swiotlb_enable = true;
- xen_swiotlb = true;
- xen_swiotlb_init_early();
+ x86_swiotlb_flags |= SWIOTLB_ANY;
+ swiotlb_init_remap(true, x86_swiotlb_flags, xen_swiotlb_fixup);
dma_ops = &xen_swiotlb_dma_ops;
if (IS_ENABLED(CONFIG_PCI))
pci_request_acs();
@@ -88,14 +86,16 @@ static void __init pci_xen_swiotlb_init(void)
int pci_xen_swiotlb_init_late(void)
{
- int rc;
-
- if (xen_swiotlb)
+ if (dma_ops == &xen_swiotlb_dma_ops)
return 0;
- rc = xen_swiotlb_init();
- if (rc)
- return rc;
+ /* we can work with the default swiotlb */
+ if (!io_tlb_default_mem.nslabs) {
+ int rc = swiotlb_init_late(swiotlb_size_or_default(),
+ GFP_KERNEL, xen_swiotlb_fixup);
+ if (rc < 0)
+ return rc;
+ }
/* XXX: this switches the dma ops under live devices! */
dma_ops = &xen_swiotlb_dma_ops;
diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c
index c2da3eb4826e8..df8085b50df10 100644
--- a/drivers/xen/swiotlb-xen.c
+++ b/drivers/xen/swiotlb-xen.c
@@ -104,7 +104,7 @@ static int is_xen_swiotlb_buffer(struct device *dev, dma_addr_t dma_addr)
return 0;
}
-static int xen_swiotlb_fixup(void *buf, unsigned long nslabs)
+int xen_swiotlb_fixup(void *buf, unsigned long nslabs)
{
int rc;
unsigned int order = get_order(IO_TLB_SEGSIZE << IO_TLB_SHIFT);
@@ -130,132 +130,6 @@ static int xen_swiotlb_fixup(void *buf, unsigned long nslabs)
return 0;
}
-enum xen_swiotlb_err {
- XEN_SWIOTLB_UNKNOWN = 0,
- XEN_SWIOTLB_ENOMEM,
- XEN_SWIOTLB_EFIXUP
-};
-
-static const char *xen_swiotlb_error(enum xen_swiotlb_err err)
-{
- switch (err) {
- case XEN_SWIOTLB_ENOMEM:
- return "Cannot allocate Xen-SWIOTLB buffer\n";
- case XEN_SWIOTLB_EFIXUP:
- return "Failed to get contiguous memory for DMA from Xen!\n"\
- "You either: don't have the permissions, do not have"\
- " enough free memory under 4GB, or the hypervisor memory"\
- " is too fragmented!";
- default:
- break;
- }
- return "";
-}
-
-int xen_swiotlb_init(void)
-{
- enum xen_swiotlb_err m_ret = XEN_SWIOTLB_UNKNOWN;
- unsigned long bytes = swiotlb_size_or_default();
- unsigned long nslabs = bytes >> IO_TLB_SHIFT;
- unsigned int order, repeat = 3;
- int rc = -ENOMEM;
- char *start;
-
- if (io_tlb_default_mem.nslabs) {
- pr_warn("swiotlb buffer already initialized\n");
- return -EEXIST;
- }
-
-retry:
- m_ret = XEN_SWIOTLB_ENOMEM;
- order = get_order(bytes);
-
- /*
- * Get IO TLB memory from any location.
- */
-#define SLABS_PER_PAGE (1 << (PAGE_SHIFT - IO_TLB_SHIFT))
-#define IO_TLB_MIN_SLABS ((1<<20) >> IO_TLB_SHIFT)
- while ((SLABS_PER_PAGE << order) > IO_TLB_MIN_SLABS) {
- start = (void *)xen_get_swiotlb_free_pages(order);
- if (start)
- break;
- order--;
- }
- if (!start)
- goto exit;
- if (order != get_order(bytes)) {
- pr_warn("Warning: only able to allocate %ld MB for software IO TLB\n",
- (PAGE_SIZE << order) >> 20);
- nslabs = SLABS_PER_PAGE << order;
- bytes = nslabs << IO_TLB_SHIFT;
- }
-
- /*
- * And replace that memory with pages under 4GB.
- */
- rc = xen_swiotlb_fixup(start, nslabs);
- if (rc) {
- free_pages((unsigned long)start, order);
- m_ret = XEN_SWIOTLB_EFIXUP;
- goto error;
- }
- rc = swiotlb_late_init_with_tbl(start, nslabs);
- if (rc)
- return rc;
- return 0;
-error:
- if (nslabs > 1024 && repeat--) {
- /* Min is 2MB */
- nslabs = max(1024UL, ALIGN(nslabs >> 1, IO_TLB_SEGSIZE));
- bytes = nslabs << IO_TLB_SHIFT;
- pr_info("Lowering to %luMB\n", bytes >> 20);
- goto retry;
- }
-exit:
- pr_err("%s (rc:%d)\n", xen_swiotlb_error(m_ret), rc);
- return rc;
-}
-
-#ifdef CONFIG_X86
-void __init xen_swiotlb_init_early(void)
-{
- unsigned long bytes = swiotlb_size_or_default();
- unsigned long nslabs = bytes >> IO_TLB_SHIFT;
- unsigned int repeat = 3;
- char *start;
- int rc;
-
-retry:
- /*
- * Get IO TLB memory from any location.
- */
- start = memblock_alloc(PAGE_ALIGN(bytes),
- IO_TLB_SEGSIZE << IO_TLB_SHIFT);
- if (!start)
- panic("%s: Failed to allocate %lu bytes\n",
- __func__, PAGE_ALIGN(bytes));
-
- /*
- * And replace that memory with pages under 4GB.
- */
- rc = xen_swiotlb_fixup(start, nslabs);
- if (rc) {
- memblock_free(start, PAGE_ALIGN(bytes));
- if (nslabs > 1024 && repeat--) {
- /* Min is 2MB */
- nslabs = max(1024UL, ALIGN(nslabs >> 1, IO_TLB_SEGSIZE));
- bytes = nslabs << IO_TLB_SHIFT;
- pr_info("Lowering to %luMB\n", bytes >> 20);
- goto retry;
- }
- panic("%s (rc:%d)", xen_swiotlb_error(XEN_SWIOTLB_EFIXUP), rc);
- }
-
- if (swiotlb_init_with_tbl(start, nslabs, SWIOTLB_VERBOSE))
- panic("Cannot allocate SWIOTLB buffer");
-}
-#endif /* CONFIG_X86 */
-
static void *
xen_swiotlb_alloc_coherent(struct device *hwdev, size_t size,
dma_addr_t *dma_handle, gfp_t flags,
diff --git a/include/xen/arm/page.h b/include/xen/arm/page.h
index ac1b654705631..7e199c6656b90 100644
--- a/include/xen/arm/page.h
+++ b/include/xen/arm/page.h
@@ -115,6 +115,5 @@ static inline bool set_phys_to_machine(unsigned long pfn, unsigned long mfn)
bool xen_arch_need_swiotlb(struct device *dev,
phys_addr_t phys,
dma_addr_t dev_addr);
-unsigned long xen_get_swiotlb_free_pages(unsigned int order);
#endif /* _ASM_ARM_XEN_PAGE_H */
diff --git a/include/xen/swiotlb-xen.h b/include/xen/swiotlb-xen.h
index b3e647f86e3e2..590ceb923f0c8 100644
--- a/include/xen/swiotlb-xen.h
+++ b/include/xen/swiotlb-xen.h
@@ -10,8 +10,12 @@ void xen_dma_sync_for_cpu(struct device *dev, dma_addr_t handle,
void xen_dma_sync_for_device(struct device *dev, dma_addr_t handle,
size_t size, enum dma_data_direction dir);
-int xen_swiotlb_init(void);
-void __init xen_swiotlb_init_early(void);
+#ifdef CONFIG_SWIOTLB_XEN
+int xen_swiotlb_fixup(void *buf, unsigned long nslabs);
+#else
+#define xen_swiotlb_fixup NULL
+#endif
+
extern const struct dma_map_ops xen_swiotlb_dma_ops;
#endif /* __LINUX_SWIOTLB_XEN_H */
--
2.30.2
^ permalink raw reply related [flat|nested] 31+ messages in thread* [PATCH 14/15] swiotlb: remove swiotlb_init_with_tbl and swiotlb_init_late_with_tbl
2022-04-04 5:05 cleanup swiotlb initialization v8 Christoph Hellwig
` (12 preceding siblings ...)
2022-04-04 5:05 ` [PATCH 13/15] swiotlb: merge swiotlb-xen initialization into swiotlb Christoph Hellwig
@ 2022-04-04 5:05 ` Christoph Hellwig
2022-04-04 5:05 ` [PATCH 15/15] x86: remove cruft from <asm/dma-mapping.h> Christoph Hellwig
` (4 subsequent siblings)
18 siblings, 0 replies; 31+ messages in thread
From: Christoph Hellwig @ 2022-04-04 5:05 UTC (permalink / raw)
To: iommu
Cc: x86, Anshuman Khandual, Tom Lendacky, Konrad Rzeszutek Wilk,
Stefano Stabellini, Boris Ostrovsky, Juergen Gross, Joerg Roedel,
David Woodhouse, Lu Baolu, Robin Murphy, linux-arm-kernel,
xen-devel, linux-ia64, linux-mips, linuxppc-dev, linux-riscv,
linux-s390, linux-hyperv, tboot-devel, linux-pci
No users left.
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
include/linux/swiotlb.h | 2 --
kernel/dma/swiotlb.c | 77 +++++++++++------------------------------
2 files changed, 20 insertions(+), 59 deletions(-)
diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h
index 7b50c82f84ce9..7ed35dd3de6e7 100644
--- a/include/linux/swiotlb.h
+++ b/include/linux/swiotlb.h
@@ -34,13 +34,11 @@ struct scatterlist;
/* default to 64MB */
#define IO_TLB_DEFAULT_SIZE (64UL<<20)
-int swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, unsigned int flags);
unsigned long swiotlb_size_or_default(void);
void __init swiotlb_init_remap(bool addressing_limit, unsigned int flags,
int (*remap)(void *tlb, unsigned long nslabs));
int swiotlb_init_late(size_t size, gfp_t gfp_mask,
int (*remap)(void *tlb, unsigned long nslabs));
-extern int swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs);
extern void __init swiotlb_update_mem_attributes(void);
phys_addr_t swiotlb_tbl_map_single(struct device *hwdev, phys_addr_t phys,
diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c
index d5fe8f5e08300..c54fc40ebb493 100644
--- a/kernel/dma/swiotlb.c
+++ b/kernel/dma/swiotlb.c
@@ -225,33 +225,6 @@ static void swiotlb_init_io_tlb_mem(struct io_tlb_mem *mem, phys_addr_t start,
return;
}
-int __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs,
- unsigned int flags)
-{
- struct io_tlb_mem *mem = &io_tlb_default_mem;
- size_t alloc_size;
-
- if (swiotlb_force_disable)
- return 0;
-
- /* protect against double initialization */
- if (WARN_ON_ONCE(mem->nslabs))
- return -ENOMEM;
-
- alloc_size = PAGE_ALIGN(array_size(sizeof(*mem->slots), nslabs));
- mem->slots = memblock_alloc(alloc_size, PAGE_SIZE);
- if (!mem->slots)
- panic("%s: Failed to allocate %zu bytes align=0x%lx\n",
- __func__, alloc_size, PAGE_SIZE);
-
- swiotlb_init_io_tlb_mem(mem, __pa(tlb), nslabs, false);
- mem->force_bounce = flags & SWIOTLB_FORCE;
-
- if (flags & SWIOTLB_VERBOSE)
- swiotlb_print_info();
- return 0;
-}
-
/*
* Statically reserve bounce buffer space and initialize bounce buffer data
* structures for the software IO TLB used to implement the DMA API.
@@ -259,7 +232,9 @@ int __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs,
void __init swiotlb_init_remap(bool addressing_limit, unsigned int flags,
int (*remap)(void *tlb, unsigned long nslabs))
{
+ struct io_tlb_mem *mem = &io_tlb_default_mem;
unsigned long nslabs = default_nslabs;
+ size_t alloc_size = PAGE_ALIGN(array_size(sizeof(*mem->slots), nslabs));
size_t bytes;
void *tlb;
@@ -280,7 +255,8 @@ void __init swiotlb_init_remap(bool addressing_limit, unsigned int flags,
else
tlb = memblock_alloc_low(bytes, PAGE_SIZE);
if (!tlb)
- goto fail;
+ panic("%s: failed to allocate tlb structure\n", __func__);
+
if (remap && remap(tlb, nslabs) < 0) {
memblock_free(tlb, PAGE_ALIGN(bytes));
@@ -290,14 +266,17 @@ void __init swiotlb_init_remap(bool addressing_limit, unsigned int flags,
__func__, bytes);
goto retry;
}
- if (swiotlb_init_with_tbl(tlb, default_nslabs, flags))
- goto fail_free_mem;
- return;
-fail_free_mem:
- memblock_free(tlb, bytes);
-fail:
- pr_warn("Cannot allocate buffer");
+ mem->slots = memblock_alloc(alloc_size, PAGE_SIZE);
+ if (!mem->slots)
+ panic("%s: Failed to allocate %zu bytes align=0x%lx\n",
+ __func__, alloc_size, PAGE_SIZE);
+
+ swiotlb_init_io_tlb_mem(mem, __pa(tlb), default_nslabs, false);
+ mem->force_bounce = flags & SWIOTLB_FORCE;
+
+ if (flags & SWIOTLB_VERBOSE)
+ swiotlb_print_info();
}
void __init swiotlb_init(bool addressing_limit, unsigned int flags)
@@ -313,6 +292,7 @@ void __init swiotlb_init(bool addressing_limit, unsigned int flags)
int swiotlb_init_late(size_t size, gfp_t gfp_mask,
int (*remap)(void *tlb, unsigned long nslabs))
{
+ struct io_tlb_mem *mem = &io_tlb_default_mem;
unsigned long nslabs = ALIGN(size >> IO_TLB_SHIFT, IO_TLB_SEGSIZE);
unsigned long bytes;
unsigned char *vstart = NULL;
@@ -353,33 +333,16 @@ int swiotlb_init_late(size_t size, gfp_t gfp_mask,
return rc;
goto retry;
}
- rc = swiotlb_late_init_with_tbl(vstart, nslabs);
- if (rc)
- free_pages((unsigned long)vstart, order);
-
- return rc;
-}
-
-int
-swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs)
-{
- struct io_tlb_mem *mem = &io_tlb_default_mem;
- unsigned long bytes = nslabs << IO_TLB_SHIFT;
-
- if (swiotlb_force_disable)
- return 0;
-
- /* protect against double initialization */
- if (WARN_ON_ONCE(mem->nslabs))
- return -ENOMEM;
mem->slots = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
get_order(array_size(sizeof(*mem->slots), nslabs)));
- if (!mem->slots)
+ if (!mem->slots) {
+ free_pages((unsigned long)vstart, order);
return -ENOMEM;
+ }
- set_memory_decrypted((unsigned long)tlb, bytes >> PAGE_SHIFT);
- swiotlb_init_io_tlb_mem(mem, virt_to_phys(tlb), nslabs, true);
+ set_memory_decrypted((unsigned long)vstart, bytes >> PAGE_SHIFT);
+ swiotlb_init_io_tlb_mem(mem, virt_to_phys(vstart), nslabs, true);
swiotlb_print_info();
return 0;
--
2.30.2
^ permalink raw reply related [flat|nested] 31+ messages in thread* [PATCH 15/15] x86: remove cruft from <asm/dma-mapping.h>
2022-04-04 5:05 cleanup swiotlb initialization v8 Christoph Hellwig
` (13 preceding siblings ...)
2022-04-04 5:05 ` [PATCH 14/15] swiotlb: remove swiotlb_init_with_tbl and swiotlb_init_late_with_tbl Christoph Hellwig
@ 2022-04-04 5:05 ` Christoph Hellwig
[not found] ` <67c1784af6f24f3e871ddfb1478e821c@FR3P281MB0843.DEUP281.PROD.OUTLOOK.COM>
` (3 subsequent siblings)
18 siblings, 0 replies; 31+ messages in thread
From: Christoph Hellwig @ 2022-04-04 5:05 UTC (permalink / raw)
To: iommu
Cc: x86, Anshuman Khandual, Tom Lendacky, Konrad Rzeszutek Wilk,
Stefano Stabellini, Boris Ostrovsky, Juergen Gross, Joerg Roedel,
David Woodhouse, Lu Baolu, Robin Murphy, linux-arm-kernel,
xen-devel, linux-ia64, linux-mips, linuxppc-dev, linux-riscv,
linux-s390, linux-hyperv, tboot-devel, linux-pci
<asm/dma-mapping.h> gets pulled in by all drivers using the DMA API.
Remove x86 internal variables and unnecessary includes from it.
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
arch/x86/include/asm/dma-mapping.h | 11 -----------
arch/x86/include/asm/iommu.h | 2 ++
2 files changed, 2 insertions(+), 11 deletions(-)
diff --git a/arch/x86/include/asm/dma-mapping.h b/arch/x86/include/asm/dma-mapping.h
index 256fd8115223d..1c66708e30623 100644
--- a/arch/x86/include/asm/dma-mapping.h
+++ b/arch/x86/include/asm/dma-mapping.h
@@ -2,17 +2,6 @@
#ifndef _ASM_X86_DMA_MAPPING_H
#define _ASM_X86_DMA_MAPPING_H
-/*
- * IOMMU interface. See Documentation/core-api/dma-api-howto.rst and
- * Documentation/core-api/dma-api.rst for documentation.
- */
-
-#include <linux/scatterlist.h>
-#include <asm/io.h>
-
-extern int iommu_merge;
-extern int panic_on_overflow;
-
extern const struct dma_map_ops *dma_ops;
static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
diff --git a/arch/x86/include/asm/iommu.h b/arch/x86/include/asm/iommu.h
index dba89ed40d38d..0bef44d30a278 100644
--- a/arch/x86/include/asm/iommu.h
+++ b/arch/x86/include/asm/iommu.h
@@ -8,6 +8,8 @@
extern int force_iommu, no_iommu;
extern int iommu_detected;
+extern int iommu_merge;
+extern int panic_on_overflow;
#ifdef CONFIG_SWIOTLB
extern bool x86_swiotlb_enable;
--
2.30.2
^ permalink raw reply related [flat|nested] 31+ messages in thread[parent not found: <67c1784af6f24f3e871ddfb1478e821c@FR3P281MB0843.DEUP281.PROD.OUTLOOK.COM>]
* Re: [PATCH 12/15] swiotlb: provide swiotlb_init variants that remap the buffer
[not found] ` <67c1784af6f24f3e871ddfb1478e821c@FR3P281MB0843.DEUP281.PROD.OUTLOOK.COM>
@ 2022-04-04 6:19 ` Alan Robinson
0 siblings, 0 replies; 31+ messages in thread
From: Alan Robinson @ 2022-04-04 6:19 UTC (permalink / raw)
To: Christoph Hellwig
Cc: iommu, x86, Anshuman Khandual, Tom Lendacky,
Konrad Rzeszutek Wilk, Stefano Stabellini, Boris Ostrovsky,
Juergen Gross, Joerg Roedel, David Woodhouse, Lu Baolu,
Robin Murphy, linux-arm-kernel, xen-devel, linux-ia64,
linux-mips, linuxppc-dev, linux-riscv, linux-s390, linux-hyperv,
tboot-devel, linux-pci
Hi Christoph,
On Mon, Apr 04, 2022 at 05:05:56AM +0000, Christoph Hellwig wrote:
> From: Christoph Hellwig <hch@lst.de>
> Subject: [PATCH 12/15] swiotlb: provide swiotlb_init variants that remap
> the buffer
>
> To shared more code between swiotlb and xen-swiotlb, offer a
> swiotlb_init_remap interface and add a remap callback to
> swiotlb_init_late that will allow Xen to remap the buffer the
s/the buffer//
> buffer without duplicating much of the logic.
Alan
>
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
> arch/x86/pci/sta2x11-fixup.c | 2 +-
> include/linux/swiotlb.h | 5 ++++-
> kernel/dma/swiotlb.c | 36 +++++++++++++++++++++++++++++++++---
> 3 files changed, 38 insertions(+), 5 deletions(-)
>
> diff --git a/arch/x86/pci/sta2x11-fixup.c b/arch/x86/pci/sta2x11-fixup.c
> index c7e6faf59a861..7368afc039987 100644
> --- a/arch/x86/pci/sta2x11-fixup.c
> +++ b/arch/x86/pci/sta2x11-fixup.c
> @@ -57,7 +57,7 @@ static void sta2x11_new_instance(struct pci_dev *pdev)
> int size = STA2X11_SWIOTLB_SIZE;
> /* First instance: register your own swiotlb area */
> dev_info(&pdev->dev, "Using SWIOTLB (size %i)\n", size);
> - if (swiotlb_init_late(size, GFP_DMA))
> + if (swiotlb_init_late(size, GFP_DMA, NULL))
> dev_emerg(&pdev->dev, "init swiotlb failed\n");
> }
> list_add(&instance->list, &sta2x11_instance_list);
> diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h
> index ee655f2e4d28b..7b50c82f84ce9 100644
> --- a/include/linux/swiotlb.h
> +++ b/include/linux/swiotlb.h
> @@ -36,8 +36,11 @@ struct scatterlist;
>
> int swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, unsigned int flags);
> unsigned long swiotlb_size_or_default(void);
> +void __init swiotlb_init_remap(bool addressing_limit, unsigned int flags,
> + int (*remap)(void *tlb, unsigned long nslabs));
> +int swiotlb_init_late(size_t size, gfp_t gfp_mask,
> + int (*remap)(void *tlb, unsigned long nslabs));
> extern int swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs);
> -int swiotlb_init_late(size_t size, gfp_t gfp_mask);
> extern void __init swiotlb_update_mem_attributes(void);
>
> phys_addr_t swiotlb_tbl_map_single(struct device *hwdev, phys_addr_t phys,
> diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c
> index 119187afc65ec..d5fe8f5e08300 100644
> --- a/kernel/dma/swiotlb.c
> +++ b/kernel/dma/swiotlb.c
> @@ -256,9 +256,11 @@ int __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs,
> * Statically reserve bounce buffer space and initialize bounce buffer data
> * structures for the software IO TLB used to implement the DMA API.
> */
> -void __init swiotlb_init(bool addressing_limit, unsigned int flags)
> +void __init swiotlb_init_remap(bool addressing_limit, unsigned int flags,
> + int (*remap)(void *tlb, unsigned long nslabs))
> {
> - size_t bytes = PAGE_ALIGN(default_nslabs << IO_TLB_SHIFT);
> + unsigned long nslabs = default_nslabs;
> + size_t bytes;
> void *tlb;
>
> if (!addressing_limit && !swiotlb_force_bounce)
> @@ -271,12 +273,23 @@ void __init swiotlb_init(bool addressing_limit, unsigned int flags)
> * allow to pick a location everywhere for hypervisors with guest
> * memory encryption.
> */
> +retry:
> + bytes = PAGE_ALIGN(default_nslabs << IO_TLB_SHIFT);
> if (flags & SWIOTLB_ANY)
> tlb = memblock_alloc(bytes, PAGE_SIZE);
> else
> tlb = memblock_alloc_low(bytes, PAGE_SIZE);
> if (!tlb)
> goto fail;
> + if (remap && remap(tlb, nslabs) < 0) {
> + memblock_free(tlb, PAGE_ALIGN(bytes));
> +
> + nslabs = ALIGN(nslabs >> 1, IO_TLB_SEGSIZE);
> + if (nslabs < IO_TLB_MIN_SLABS)
> + panic("%s: Failed to remap %zu bytes\n",
> + __func__, bytes);
> + goto retry;
> + }
> if (swiotlb_init_with_tbl(tlb, default_nslabs, flags))
> goto fail_free_mem;
> return;
> @@ -287,12 +300,18 @@ void __init swiotlb_init(bool addressing_limit, unsigned int flags)
> pr_warn("Cannot allocate buffer");
> }
>
> +void __init swiotlb_init(bool addressing_limit, unsigned int flags)
> +{
> + return swiotlb_init_remap(addressing_limit, flags, NULL);
> +}
> +
> /*
> * Systems with larger DMA zones (those that don't support ISA) can
> * initialize the swiotlb later using the slab allocator if needed.
> * This should be just like above, but with some error catching.
> */
> -int swiotlb_init_late(size_t size, gfp_t gfp_mask)
> +int swiotlb_init_late(size_t size, gfp_t gfp_mask,
> + int (*remap)(void *tlb, unsigned long nslabs))
> {
> unsigned long nslabs = ALIGN(size >> IO_TLB_SHIFT, IO_TLB_SEGSIZE);
> unsigned long bytes;
> @@ -303,6 +322,7 @@ int swiotlb_init_late(size_t size, gfp_t gfp_mask)
> if (swiotlb_force_disable)
> return 0;
>
> +retry:
> order = get_order(nslabs << IO_TLB_SHIFT);
> nslabs = SLABS_PER_PAGE << order;
> bytes = nslabs << IO_TLB_SHIFT;
> @@ -323,6 +343,16 @@ int swiotlb_init_late(size_t size, gfp_t gfp_mask)
> (PAGE_SIZE << order) >> 20);
> nslabs = SLABS_PER_PAGE << order;
> }
> + if (remap)
> + rc = remap(vstart, nslabs);
> + if (rc) {
> + free_pages((unsigned long)vstart, order);
> +
> + nslabs = ALIGN(nslabs >> 1, IO_TLB_SEGSIZE);
> + if (nslabs < IO_TLB_MIN_SLABS)
> + return rc;
> + goto retry;
> + }
> rc = swiotlb_late_init_with_tbl(vstart, nslabs);
> if (rc)
> free_pages((unsigned long)vstart, order);
> --
> 2.30.2
>
^ permalink raw reply [flat|nested] 31+ messages in thread
* Re: cleanup swiotlb initialization v8
2022-04-04 5:05 cleanup swiotlb initialization v8 Christoph Hellwig
` (15 preceding siblings ...)
[not found] ` <67c1784af6f24f3e871ddfb1478e821c@FR3P281MB0843.DEUP281.PROD.OUTLOOK.COM>
@ 2022-04-05 20:06 ` Boris Ostrovsky
2022-04-07 0:31 ` Konrad Rzeszutek Wilk
2022-04-13 6:20 ` Christoph Hellwig
18 siblings, 0 replies; 31+ messages in thread
From: Boris Ostrovsky @ 2022-04-05 20:06 UTC (permalink / raw)
To: Christoph Hellwig, iommu
Cc: x86, Anshuman Khandual, Tom Lendacky, Konrad Rzeszutek Wilk,
Stefano Stabellini, Juergen Gross, Joerg Roedel, David Woodhouse,
Lu Baolu, Robin Murphy, linux-arm-kernel, xen-devel, linux-ia64,
linux-mips, linuxppc-dev, linux-riscv, linux-s390, linux-hyperv,
tboot-devel, linux-pci
On 4/4/22 1:05 AM, Christoph Hellwig wrote:
> Hi all,
>
> this series tries to clean up the swiotlb initialization, including
> that of swiotlb-xen. To get there is also removes the x86 iommu table
> infrastructure that massively obsfucates the initialization path.
>
> Git tree:
>
> git://git.infradead.org/users/hch/misc.git swiotlb-init-cleanup
>
> Gitweb:
>
> http://git.infradead.org/users/hch/misc.git/shortlog/refs/heads/swiotlb-init-cleanup
Tested-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
^ permalink raw reply [flat|nested] 31+ messages in thread* Re: cleanup swiotlb initialization v8
2022-04-04 5:05 cleanup swiotlb initialization v8 Christoph Hellwig
` (16 preceding siblings ...)
2022-04-05 20:06 ` cleanup swiotlb initialization v8 Boris Ostrovsky
@ 2022-04-07 0:31 ` Konrad Rzeszutek Wilk
2022-04-13 6:20 ` Christoph Hellwig
18 siblings, 0 replies; 31+ messages in thread
From: Konrad Rzeszutek Wilk @ 2022-04-07 0:31 UTC (permalink / raw)
To: Christoph Hellwig
Cc: iommu, x86, Anshuman Khandual, Tom Lendacky, Stefano Stabellini,
Boris Ostrovsky, Juergen Gross, Joerg Roedel, David Woodhouse,
Lu Baolu, Robin Murphy, linux-arm-kernel, xen-devel, linux-ia64,
linux-mips, linuxppc-dev, linux-riscv, linux-s390, linux-hyperv,
tboot-devel, linux-pci
On Mon, Apr 04, 2022 at 07:05:44AM +0200, Christoph Hellwig wrote:
> Hi all,
>
> this series tries to clean up the swiotlb initialization, including
> that of swiotlb-xen. To get there is also removes the x86 iommu table
> infrastructure that massively obsfucates the initialization path.
>
> Git tree:
>
> git://git.infradead.org/users/hch/misc.git swiotlb-init-cleanup
>
> Gitweb:
>
> http://git.infradead.org/users/hch/misc.git/shortlog/refs/heads/swiotlb-init-cleanup
>
> Changes since v7:
> - rebased to Linux 5.18-rc1
> - better document the lower bound swiotlb size for xen-swiotlb
> - improve the nslabs calculation for the retry case in
> swiotlb_init_remap and swiotlb_init_late
Hey Christoph,
Feel free to tack on
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
on them if you would like.
Thank you for doing the spring cleaning of this codebase!
^ permalink raw reply [flat|nested] 31+ messages in thread* Re: cleanup swiotlb initialization v8
2022-04-04 5:05 cleanup swiotlb initialization v8 Christoph Hellwig
` (17 preceding siblings ...)
2022-04-07 0:31 ` Konrad Rzeszutek Wilk
@ 2022-04-13 6:20 ` Christoph Hellwig
18 siblings, 0 replies; 31+ messages in thread
From: Christoph Hellwig @ 2022-04-13 6:20 UTC (permalink / raw)
To: iommu
Cc: x86, Anshuman Khandual, Tom Lendacky, Konrad Rzeszutek Wilk,
Stefano Stabellini, Boris Ostrovsky, Juergen Gross, Joerg Roedel,
David Woodhouse, Lu Baolu, Robin Murphy, linux-arm-kernel,
xen-devel, linux-ia64, linux-mips, linuxppc-dev, linux-riscv,
linux-s390, linux-hyperv, tboot-devel, linux-pci
On Mon, Apr 04, 2022 at 07:05:44AM +0200, Christoph Hellwig wrote:
> Hi all,
>
> this series tries to clean up the swiotlb initialization, including
> that of swiotlb-xen. To get there is also removes the x86 iommu table
> infrastructure that massively obsfucates the initialization path.
>
> Git tree:
>
> git://git.infradead.org/users/hch/misc.git swiotlb-init-cleanup
>
> Gitweb:
>
> http://git.infradead.org/users/hch/misc.git/shortlog/refs/heads/swiotlb-init-cleanup
I've updated the git tree above with the commit message nitpicks and
received reviews. I plan to pull the patches into the dma-mapping
tree after -rc3 is released, so if any involved maintainer is not happy
with the result, please speak up now.
^ permalink raw reply [flat|nested] 31+ messages in thread