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Message-Id: <20200221032720.33893-20-alastair@au1.ibm.com>
Date: Fri, 21 Feb 2020 14:27:12 +1100
From: "Alastair D'Silva" <alastair@....ibm.com>
To: alastair@...ilva.org
Cc: "Aneesh Kumar K . V" <aneesh.kumar@...ux.ibm.com>,
"Oliver O'Halloran" <oohall@...il.com>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Paul Mackerras <paulus@...ba.org>,
Michael Ellerman <mpe@...erman.id.au>,
Frederic Barrat <fbarrat@...ux.ibm.com>,
Andrew Donnellan <ajd@...ux.ibm.com>,
Arnd Bergmann <arnd@...db.de>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Dan Williams <dan.j.williams@...el.com>,
Vishal Verma <vishal.l.verma@...el.com>,
Dave Jiang <dave.jiang@...el.com>,
Ira Weiny <ira.weiny@...el.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
"David S. Miller" <davem@...emloft.net>,
Rob Herring <robh@...nel.org>,
Anton Blanchard <anton@...abs.org>,
Krzysztof Kozlowski <krzk@...nel.org>,
Mahesh Salgaonkar <mahesh@...ux.vnet.ibm.com>,
Madhavan Srinivasan <maddy@...ux.vnet.ibm.com>,
Cédric Le Goater <clg@...d.org>,
Anju T Sudhakar <anju@...ux.vnet.ibm.com>,
Hari Bathini <hbathini@...ux.ibm.com>,
Thomas Gleixner <tglx@...utronix.de>,
Greg Kurz <groug@...d.org>,
Nicholas Piggin <npiggin@...il.com>,
Masahiro Yamada <yamada.masahiro@...ionext.com>,
Alexey Kardashevskiy <aik@...abs.ru>,
linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
linux-nvdimm@...ts.01.org, linux-mm@...ck.org
Subject: [PATCH v3 19/27] powerpc/powernv/pmem: Add an IOCTL to report controller statistics
From: Alastair D'Silva <alastair@...ilva.org>
The controller can report a number of statistics that are useful
in evaluating the performance and reliability of the card.
This patch exposes this information via an IOCTL.
Signed-off-by: Alastair D'Silva <alastair@...ilva.org>
---
arch/powerpc/platforms/powernv/pmem/ocxl.c | 185 +++++++++++++++++++++
include/uapi/nvdimm/ocxl-pmem.h | 17 ++
2 files changed, 202 insertions(+)
diff --git a/arch/powerpc/platforms/powernv/pmem/ocxl.c b/arch/powerpc/platforms/powernv/pmem/ocxl.c
index 2cabafe1fc58..009d4fd29e7d 100644
--- a/arch/powerpc/platforms/powernv/pmem/ocxl.c
+++ b/arch/powerpc/platforms/powernv/pmem/ocxl.c
@@ -758,6 +758,186 @@ static int ioctl_controller_dump_complete(struct ocxlpmem *ocxlpmem)
GLOBAL_MMIO_HCI_CONTROLLER_DUMP_COLLECTED);
}
+/**
+ * controller_stats_header_parse() - Parse the first 64 bits of the controller stats admin command response
+ * @ocxlpmem: the device metadata
+ * @length: out, returns the number of bytes in the response (excluding the 64 bit header)
+ */
+static int controller_stats_header_parse(struct ocxlpmem *ocxlpmem,
+ u32 *length)
+{
+ int rc;
+ u64 val;
+
+ u16 data_identifier;
+ u32 data_length;
+
+ rc = ocxl_global_mmio_read64(ocxlpmem->ocxl_afu,
+ ocxlpmem->admin_command.data_offset,
+ OCXL_LITTLE_ENDIAN, &val);
+ if (rc)
+ return rc;
+
+ data_identifier = val >> 48;
+ data_length = val & 0xFFFFFFFF;
+
+ if (data_identifier != 0x4353) { // 'CS'
+ dev_err(&ocxlpmem->dev,
+ "Bad data identifier for controller stats, expected 'CS', got '%-.*s'\n",
+ 2, (char *)&data_identifier);
+ return -EINVAL;
+ }
+
+ *length = data_length;
+ return 0;
+}
+
+static int ioctl_controller_stats(struct ocxlpmem *ocxlpmem,
+ struct ioctl_ocxl_pmem_controller_stats __user *uarg)
+{
+ struct ioctl_ocxl_pmem_controller_stats args;
+ u32 length;
+ int rc;
+ u64 val;
+
+ memset(&args, '\0', sizeof(args));
+
+ mutex_lock(&ocxlpmem->admin_command.lock);
+
+ rc = admin_command_request(ocxlpmem, ADMIN_COMMAND_CONTROLLER_STATS);
+ if (rc)
+ goto out;
+
+ rc = ocxl_global_mmio_write64(ocxlpmem->ocxl_afu,
+ ocxlpmem->admin_command.request_offset + 0x08,
+ OCXL_LITTLE_ENDIAN, 0);
+ if (rc)
+ goto out;
+
+ rc = admin_command_execute(ocxlpmem);
+ if (rc)
+ goto out;
+
+
+ rc = admin_command_complete_timeout(ocxlpmem,
+ ADMIN_COMMAND_CONTROLLER_STATS);
+ if (rc < 0) {
+ dev_warn(&ocxlpmem->dev, "Controller stats timed out\n");
+ goto out;
+ }
+
+ rc = admin_response(ocxlpmem);
+ if (rc < 0)
+ goto out;
+ if (rc != STATUS_SUCCESS) {
+ warn_status(ocxlpmem,
+ "Unexpected status from controller stats", rc);
+ goto out;
+ }
+
+ rc = controller_stats_header_parse(ocxlpmem, &length);
+ if (rc)
+ goto out;
+
+ if (length != 0x140)
+ warn_status(ocxlpmem,
+ "Unexpected length for controller stats data, expected 0x140, got 0x%x",
+ length);
+
+ rc = ocxl_global_mmio_read64(ocxlpmem->ocxl_afu,
+ ocxlpmem->admin_command.data_offset + 0x08 + 0x08,
+ OCXL_LITTLE_ENDIAN, &val);
+ if (rc)
+ goto out;
+
+ args.reset_count = val >> 32;
+ args.reset_uptime = val & 0xFFFFFFFF;
+
+ rc = ocxl_global_mmio_read64(ocxlpmem->ocxl_afu,
+ ocxlpmem->admin_command.data_offset + 0x08 + 0x10,
+ OCXL_LITTLE_ENDIAN, &val);
+ if (rc)
+ goto out;
+
+ args.power_on_uptime = val >> 32;
+
+ rc = ocxl_global_mmio_read64(ocxlpmem->ocxl_afu,
+ ocxlpmem->admin_command.data_offset + 0x08 + 0x40 + 0x08,
+ OCXL_LITTLE_ENDIAN, &args.host_load_count);
+ if (rc)
+ goto out;
+
+ rc = ocxl_global_mmio_read64(ocxlpmem->ocxl_afu,
+ ocxlpmem->admin_command.data_offset + 0x08 + 0x40 + 0x10,
+ OCXL_LITTLE_ENDIAN, &args.host_store_count);
+ if (rc)
+ goto out;
+
+ rc = ocxl_global_mmio_read64(ocxlpmem->ocxl_afu,
+ ocxlpmem->admin_command.data_offset + 0x08 + 0x40 + 0x18,
+ OCXL_LITTLE_ENDIAN, &args.media_read_count);
+ if (rc)
+ goto out;
+
+ rc = ocxl_global_mmio_read64(ocxlpmem->ocxl_afu,
+ ocxlpmem->admin_command.data_offset + 0x08 + 0x40 + 0x20,
+ OCXL_LITTLE_ENDIAN, &args.media_write_count);
+ if (rc)
+ goto out;
+
+ rc = ocxl_global_mmio_read64(ocxlpmem->ocxl_afu,
+ ocxlpmem->admin_command.data_offset + 0x08 + 0x40 + 0x28,
+ OCXL_LITTLE_ENDIAN, &args.cache_hit_count);
+ if (rc)
+ goto out;
+
+ rc = ocxl_global_mmio_read64(ocxlpmem->ocxl_afu,
+ ocxlpmem->admin_command.data_offset + 0x08 + 0x40 + 0x30,
+ OCXL_LITTLE_ENDIAN, &args.cache_miss_count);
+ if (rc)
+ goto out;
+
+ rc = ocxl_global_mmio_read64(ocxlpmem->ocxl_afu,
+ ocxlpmem->admin_command.data_offset + 0x08 + 0x40 + 0x38,
+ OCXL_LITTLE_ENDIAN, &args.media_read_latency);
+ if (rc)
+ goto out;
+
+ rc = ocxl_global_mmio_read64(ocxlpmem->ocxl_afu,
+ ocxlpmem->admin_command.data_offset + 0x08 + 0x40 + 0x40,
+ OCXL_LITTLE_ENDIAN, &args.media_write_latency);
+ if (rc)
+ goto out;
+
+ rc = ocxl_global_mmio_read64(ocxlpmem->ocxl_afu,
+ ocxlpmem->admin_command.data_offset + 0x08 + 0x40 + 0x48,
+ OCXL_LITTLE_ENDIAN, &args.cache_read_latency);
+ if (rc)
+ goto out;
+
+ rc = ocxl_global_mmio_read64(ocxlpmem->ocxl_afu,
+ ocxlpmem->admin_command.data_offset + 0x08 + 0x40 + 0x50,
+ OCXL_LITTLE_ENDIAN, &args.cache_write_latency);
+ if (rc)
+ goto out;
+
+ if (copy_to_user(uarg, &args, sizeof(args))) {
+ rc = -EFAULT;
+ goto out;
+ }
+
+ rc = admin_response_handled(ocxlpmem);
+ if (rc)
+ goto out;
+
+ rc = 0;
+ goto out;
+
+out:
+ mutex_unlock(&ocxlpmem->admin_command.lock);
+ return rc;
+}
+
static long file_ioctl(struct file *file, unsigned int cmd, unsigned long args)
{
struct ocxlpmem *ocxlpmem = file->private_data;
@@ -781,6 +961,11 @@ static long file_ioctl(struct file *file, unsigned int cmd, unsigned long args)
case IOCTL_OCXL_PMEM_CONTROLLER_DUMP_COMPLETE:
rc = ioctl_controller_dump_complete(ocxlpmem);
break;
+
+ case IOCTL_OCXL_PMEM_CONTROLLER_STATS:
+ rc = ioctl_controller_stats(ocxlpmem,
+ (struct ioctl_ocxl_pmem_controller_stats __user *)args);
+ break;
}
return rc;
diff --git a/include/uapi/nvdimm/ocxl-pmem.h b/include/uapi/nvdimm/ocxl-pmem.h
index d4d8512d03f7..add223aa2fdb 100644
--- a/include/uapi/nvdimm/ocxl-pmem.h
+++ b/include/uapi/nvdimm/ocxl-pmem.h
@@ -50,6 +50,22 @@ struct ioctl_ocxl_pmem_controller_dump_data {
__u64 reserved[8];
};
+struct ioctl_ocxl_pmem_controller_stats {
+ __u32 reset_count;
+ __u32 reset_uptime; /* seconds */
+ __u32 power_on_uptime; /* seconds */
+ __u64 host_load_count;
+ __u64 host_store_count;
+ __u64 media_read_count;
+ __u64 media_write_count;
+ __u64 cache_hit_count;
+ __u64 cache_miss_count;
+ __u64 media_read_latency; /* nanoseconds */
+ __u64 media_write_latency; /* nanoseconds */
+ __u64 cache_read_latency; /* nanoseconds */
+ __u64 cache_write_latency; /* nanoseconds */
+};
+
/* ioctl numbers */
#define OCXL_PMEM_MAGIC 0x5C
/* SCM devices */
@@ -57,5 +73,6 @@ struct ioctl_ocxl_pmem_controller_dump_data {
#define IOCTL_OCXL_PMEM_CONTROLLER_DUMP _IO(OCXL_PMEM_MAGIC, 0x02)
#define IOCTL_OCXL_PMEM_CONTROLLER_DUMP_DATA _IOWR(OCXL_PMEM_MAGIC, 0x03, struct ioctl_ocxl_pmem_controller_dump_data)
#define IOCTL_OCXL_PMEM_CONTROLLER_DUMP_COMPLETE _IO(OCXL_PMEM_MAGIC, 0x04)
+#define IOCTL_OCXL_PMEM_CONTROLLER_STATS _IO(OCXL_PMEM_MAGIC, 0x05)
#endif /* _UAPI_OCXL_SCM_H */
--
2.24.1
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