From: "Alastair D'Silva" <alastair@au1.ibm.com>
To: alastair@d-silva.org
Cc: "Benjamin Herrenschmidt" <benh@kernel.crashing.org>,
"Paul Mackerras" <paulus@samba.org>,
"Michael Ellerman" <mpe@ellerman.id.au>,
"Frederic Barrat" <fbarrat@linux.ibm.com>,
"Andrew Donnellan" <ajd@linux.ibm.com>,
"Arnd Bergmann" <arnd@arndb.de>,
"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
"Dan Williams" <dan.j.williams@intel.com>,
"Vishal Verma" <vishal.l.verma@intel.com>,
"Dave Jiang" <dave.jiang@intel.com>,
"Keith Busch" <keith.busch@intel.com>,
"Ira Weiny" <ira.weiny@intel.com>,
"Andrew Morton" <akpm@linux-foundation.org>,
"Mauro Carvalho Chehab" <mchehab+samsung@kernel.org>,
"David S. Miller" <davem@davemloft.net>,
"Rob Herring" <robh@kernel.org>,
"Anton Blanchard" <anton@ozlabs.org>,
"Krzysztof Kozlowski" <krzk@kernel.org>,
"Mahesh Salgaonkar" <mahesh@linux.vnet.ibm.com>,
"Madhavan Srinivasan" <maddy@linux.vnet.ibm.com>,
"Cédric Le Goater" <clg@kaod.org>,
"Anju T Sudhakar" <anju@linux.vnet.ibm.com>,
"Hari Bathini" <hbathini@linux.ibm.com>,
"Thomas Gleixner" <tglx@linutronix.de>,
"Greg Kurz" <groug@kaod.org>,
"Nicholas Piggin" <npiggin@gmail.com>,
"Masahiro Yamada" <yamada.masahiro@socionext.com>,
"Alexey Kardashevskiy" <aik@ozlabs.ru>,
linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
linux-nvdimm@lists.01.org, linux-mm@kvack.org
Subject: [PATCH v2 12/27] nvdimm/ocxl: Read the capability registers & wait for device ready
Date: Tue, 3 Dec 2019 14:46:40 +1100 [thread overview]
Message-ID: <20191203034655.51561-13-alastair@au1.ibm.com> (raw)
In-Reply-To: <20191203034655.51561-1-alastair@au1.ibm.com>
From: Alastair D'Silva <alastair@d-silva.org>
This patch reads timeouts & firmware version from the controller, and
uses those timeouts to wait for the controller to report that it is ready
before handing the memory over to libnvdimm.
Signed-off-by: Alastair D'Silva <alastair@d-silva.org>
---
drivers/nvdimm/ocxl/Makefile | 2 +-
drivers/nvdimm/ocxl/scm.c | 84 ++++++++++++++++++++++++++++++
drivers/nvdimm/ocxl/scm_internal.c | 19 +++++++
drivers/nvdimm/ocxl/scm_internal.h | 24 +++++++++
4 files changed, 128 insertions(+), 1 deletion(-)
create mode 100644 drivers/nvdimm/ocxl/scm_internal.c
diff --git a/drivers/nvdimm/ocxl/Makefile b/drivers/nvdimm/ocxl/Makefile
index 74a1bd98848e..9b6e31f0eb3e 100644
--- a/drivers/nvdimm/ocxl/Makefile
+++ b/drivers/nvdimm/ocxl/Makefile
@@ -4,4 +4,4 @@ ccflags-$(CONFIG_PPC_WERROR) += -Werror
obj-$(CONFIG_OCXL_SCM) += ocxlscm.o
-ocxlscm-y := scm.o
+ocxlscm-y := scm.o scm_internal.o
diff --git a/drivers/nvdimm/ocxl/scm.c b/drivers/nvdimm/ocxl/scm.c
index 571058a9e7b8..8088f65c289e 100644
--- a/drivers/nvdimm/ocxl/scm.c
+++ b/drivers/nvdimm/ocxl/scm.c
@@ -7,6 +7,7 @@
#include <linux/module.h>
#include <misc/ocxl.h>
+#include <linux/delay.h>
#include <linux/ndctl.h>
#include <linux/mm_types.h>
#include <linux/memory_hotplug.h>
@@ -266,6 +267,30 @@ static int scm_register_lpc_mem(struct scm_data *scm_data)
return 0;
}
+/**
+ * scm_is_usable() - Is a controller usable?
+ * @scm_data: a pointer to the SCM device data
+ * Return: true if the controller is usable
+ */
+static bool scm_is_usable(const struct scm_data *scm_data)
+{
+ u64 chi = 0;
+ int rc = scm_chi(scm_data, &chi);
+
+ if (!(chi & GLOBAL_MMIO_CHI_CRDY)) {
+ dev_err(&scm_data->dev, "SCM controller is not ready.\n");
+ return false;
+ }
+
+ if (!(chi & GLOBAL_MMIO_CHI_MA)) {
+ dev_err(&scm_data->dev,
+ "SCM controller does not have memory available.\n");
+ return false;
+ }
+
+ return true;
+}
+
/**
* allocate_scm_minor() - Allocate a minor number to use for an SCM device
* @scm_data: The SCM device to associate the minor with
@@ -380,6 +405,48 @@ static void scm_remove(struct pci_dev *pdev)
}
}
+/**
+ * read_device_metadata() - Retrieve config information from the AFU and save it for future use
+ * @scm_data: the SCM metadata
+ * Return: 0 on success, negative on failure
+ */
+static int read_device_metadata(struct scm_data *scm_data)
+{
+ u64 val;
+ int rc;
+
+ rc = ocxl_global_mmio_read64(scm_data->ocxl_afu, GLOBAL_MMIO_CCAP0,
+ OCXL_LITTLE_ENDIAN, &val);
+ if (rc)
+ return rc;
+
+ scm_data->scm_revision = val & 0xFFFF;
+ scm_data->read_latency = (val >> 32) & 0xFF;
+ scm_data->readiness_timeout = (val >> 48) & 0xff;
+ scm_data->memory_available_timeout = val >> 52;
+
+ rc = ocxl_global_mmio_read64(scm_data->ocxl_afu, GLOBAL_MMIO_CCAP1,
+ OCXL_LITTLE_ENDIAN, &val);
+ if (rc)
+ return rc;
+
+ scm_data->max_controller_dump_size = val & 0xFFFFFFFF;
+
+ // Extract firmware version text
+ rc = ocxl_global_mmio_read64(scm_data->ocxl_afu, GLOBAL_MMIO_FWVER,
+ OCXL_HOST_ENDIAN, (u64 *)scm_data->fw_version);
+ if (rc)
+ return rc;
+
+ scm_data->fw_version[8] = '\0';
+
+ dev_info(&scm_data->dev,
+ "Firmware version '%s' SCM revision %d:%d\n", scm_data->fw_version,
+ scm_data->scm_revision >> 4, scm_data->scm_revision & 0x0F);
+
+ return 0;
+}
+
/**
* scm_probe_function_0 - Set up function 0 for an OpenCAPI Storage Class Memory device
* This is important as it enables templates higher than 0 across all other functions,
@@ -420,6 +487,8 @@ static int scm_probe_function_0(struct pci_dev *pdev)
static int scm_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
struct scm_data *scm_data = NULL;
+ int elapsed;
+ u16 timeout;
if (PCI_FUNC(pdev->devfn) == 0)
return scm_probe_function_0(pdev);
@@ -469,6 +538,21 @@ static int scm_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
goto err;
}
+ if (read_device_metadata(scm_data)) {
+ dev_err(&pdev->dev, "Could not read SCM device metadata\n");
+ goto err;
+ }
+
+ elapsed = 0;
+ timeout = scm_data->readiness_timeout + scm_data->memory_available_timeout;
+ while (!scm_is_usable(scm_data)) {
+ if (elapsed++ > timeout) {
+ dev_warn(&scm_data->dev, "SCM ready timeout.\n");
+ goto err;
+ }
+
+ msleep(1000);
+ }
if (scm_register_lpc_mem(scm_data)) {
dev_err(&pdev->dev, "Could not register OCXL SCM memory with libnvdimm\n");
goto err;
diff --git a/drivers/nvdimm/ocxl/scm_internal.c b/drivers/nvdimm/ocxl/scm_internal.c
new file mode 100644
index 000000000000..72d3c0e7d846
--- /dev/null
+++ b/drivers/nvdimm/ocxl/scm_internal.c
@@ -0,0 +1,19 @@
+// SPDX-License-Identifier: GPL-2.0+
+// Copyright 2019 IBM Corp.
+
+#include <misc/ocxl.h>
+#include <linux/delay.h>
+#include "scm_internal.h"
+
+int scm_chi(const struct scm_data *scm_data, u64 *chi)
+{
+ u64 val;
+ int rc = ocxl_global_mmio_read64(scm_data->ocxl_afu, GLOBAL_MMIO_CHI,
+ OCXL_LITTLE_ENDIAN, &val);
+ if (rc)
+ return rc;
+
+ *chi = val;
+
+ return 0;
+}
diff --git a/drivers/nvdimm/ocxl/scm_internal.h b/drivers/nvdimm/ocxl/scm_internal.h
index d6ab361f5de9..584450f55e30 100644
--- a/drivers/nvdimm/ocxl/scm_internal.h
+++ b/drivers/nvdimm/ocxl/scm_internal.h
@@ -97,4 +97,28 @@ struct scm_data {
void *metadata_addr;
struct resource scm_res;
struct nd_region *nd_region;
+ char fw_version[8+1];
+
+ u32 max_controller_dump_size;
+ u16 scm_revision; // major/minor
+ u8 readiness_timeout; /* The worst case time (in seconds) that the host shall
+ * wait for the controller to become operational following a reset (CHI.CRDY).
+ */
+ u8 memory_available_timeout; /* The worst case time (in seconds) that the host shall
+ * wait for memory to become available following a reset (CHI.MA).
+ */
+
+ u16 read_latency; /* The nominal measure of latency (in nanoseconds)
+ * associated with an unassisted read of a memory block.
+ * This represents the capability of the raw media technology without assistance
+ */
};
+
+/**
+ * scm_chi() - Get the value of the CHI register
+ * @scm_data: The SCM metadata
+ * @chi: returns the CHI value
+ *
+ * Returns 0 on success, negative on error
+ */
+int scm_chi(const struct scm_data *scm_data, u64 *chi);
--
2.23.0
next prev parent reply other threads:[~2019-12-03 3:48 UTC|newest]
Thread overview: 67+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-03 3:46 [PATCH v2 00/27] Add support for OpenCAPI SCM devices Alastair D'Silva
2019-12-03 3:46 ` [PATCH v2 01/27] memory_hotplug: Add a bounds check to __add_pages Alastair D'Silva
2019-12-03 3:46 ` [PATCH v2 02/27] nvdimm: remove prototypes for nonexistent functions Alastair D'Silva
2019-12-03 4:47 ` Andrew Donnellan
2019-12-04 0:10 ` Dan Williams
2020-01-23 21:49 ` Dan Williams
2019-12-03 3:46 ` [PATCH v2 03/27] powerpc: Add OPAL calls for LPC memory alloc/release Alastair D'Silva
2019-12-03 3:46 ` [PATCH v2 04/27] mm/memory_hotplug: Allow check_hotplug_memory_addressable to be called from drivers Alastair D'Silva
2019-12-03 3:46 ` [PATCH v2 05/27] powerpc: Map & release OpenCAPI LPC memory Alastair D'Silva
2020-01-09 14:41 ` Frederic Barrat
2020-01-21 6:46 ` Andrew Donnellan
2020-01-21 7:11 ` Greg Kurz
2020-02-14 11:09 ` Frederic Barrat
2020-02-18 23:44 ` Alastair D'Silva
2019-12-03 3:46 ` [PATCH v2 06/27] ocxl: Tally up the LPC memory on a link & allow it to be mapped Alastair D'Silva
2020-01-09 14:48 ` Frederic Barrat
2020-02-03 12:37 ` Jonathan Cameron
2020-02-19 0:01 ` Alastair D'Silva
2019-12-03 3:46 ` [PATCH v2 07/27] ocxl: Add functions to map/unmap LPC memory Alastair D'Silva
2020-01-09 14:49 ` Frederic Barrat
2020-02-03 12:49 ` Jonathan Cameron
2020-02-19 2:39 ` Alastair D'Silva
2019-12-03 3:46 ` [PATCH v2 08/27] ocxl: Save the device serial number in ocxl_fn Alastair D'Silva
2020-02-03 12:53 ` Jonathan Cameron
2020-02-19 4:03 ` Alastair D'Silva
2019-12-03 3:46 ` [PATCH v2 09/27] ocxl: Free detached contexts in ocxl_context_detach_all() Alastair D'Silva
2020-01-09 14:54 ` Frederic Barrat
2019-12-03 3:46 ` [PATCH v2 10/27] nvdimm: Add driver for OpenCAPI Storage Class Memory Alastair D'Silva
2019-12-03 5:05 ` Alastair D'Silva
2020-02-03 13:20 ` Jonathan Cameron
2020-02-19 4:40 ` Alastair D'Silva
2019-12-03 3:46 ` [PATCH v2 11/27] nvdimm/ocxl: Add register addresses & status values to header Alastair D'Silva
2019-12-03 3:46 ` Alastair D'Silva [this message]
2020-02-03 13:23 ` [PATCH v2 12/27] nvdimm/ocxl: Read the capability registers & wait for device ready Jonathan Cameron
2020-02-19 4:46 ` Alastair D'Silva
2019-12-03 3:46 ` [PATCH v2 13/27] nvdimm/ocxl: Add support for Admin commands Alastair D'Silva
2020-02-03 14:18 ` Jonathan Cameron
2020-02-19 5:00 ` Alastair D'Silva
2019-12-03 3:46 ` [PATCH v2 14/27] nvdimm/ocxl: Add support for near storage commands Alastair D'Silva
2020-02-03 14:22 ` Jonathan Cameron
2020-02-19 4:54 ` Alastair D'Silva
2019-12-03 3:46 ` [PATCH v2 15/27] nvdimm/ocxl: Register a character device for userspace to interact with Alastair D'Silva
2019-12-03 3:46 ` [PATCH v2 16/27] nvdimm/ocxl: Implement the Read Error Log command Alastair D'Silva
2019-12-05 3:42 ` Alastair D'Silva
2019-12-05 19:34 ` kbuild test robot
2019-12-03 3:46 ` [PATCH v2 17/27] nvdimm/ocxl: Add controller dump IOCTLs Alastair D'Silva
2019-12-03 3:46 ` [PATCH v2 18/27] nvdimm/ocxl: Add an IOCTL to report controller statistics Alastair D'Silva
2019-12-03 3:46 ` [PATCH v2 19/27] nvdimm/ocxl: Forward events to userspace Alastair D'Silva
2019-12-03 3:46 ` [PATCH v2 20/27] nvdimm/ocxl: Add an IOCTL to request controller health & perf data Alastair D'Silva
2019-12-03 3:46 ` [PATCH v2 21/27] nvdimm/ocxl: Support firmware update via sysfs Alastair D'Silva
2019-12-03 3:46 ` [PATCH v2 22/27] nvdimm/ocxl: Implement the heartbeat command Alastair D'Silva
2020-02-03 15:11 ` Jonathan Cameron
2020-02-19 5:02 ` Alastair D'Silva
2019-12-03 3:46 ` [PATCH v2 23/27] nvdimm/ocxl: Add debug IOCTLs Alastair D'Silva
2019-12-03 3:46 ` [PATCH v2 24/27] nvdimm/ocxl: Implement Overwrite Alastair D'Silva
2020-02-03 15:10 ` Jonathan Cameron
2020-02-19 5:13 ` Alastair D'Silva
2019-12-03 3:46 ` [PATCH v2 25/27] nvdimm/ocxl: Expose SMART data via ndctl Alastair D'Silva
2019-12-16 0:15 ` Alastair D'Silva
2019-12-03 3:46 ` [PATCH v2 26/27] powerpc: Enable OpenCAPI Storage Class Memory driver on bare metal Alastair D'Silva
2019-12-03 4:54 ` Andrew Donnellan
2019-12-03 4:57 ` Alastair D'Silva
2019-12-03 3:46 ` [PATCH v2 27/27] MAINTAINERS: Add myself & nvdimm/ocxl to ocxl Alastair D'Silva
2019-12-03 3:50 ` [PATCH v2 00/27] Add support for OpenCAPI SCM devices Matthew Wilcox
2019-12-03 4:01 ` Alastair D'Silva
2019-12-03 12:42 ` Matthew Wilcox
2019-12-04 0:15 ` Dan Williams
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