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Subject[PATCH v4 23/25] nvdimm/ocxl: Expose SMART data via ndctl
Date
This patch retrieves proprietary formatted SMART data and makes it
available via ndctl. A later contribution will be made to ndctl to
parse this data.

Signed-off-by: Alastair D'Silva <alastair@d-silva.org>
---
drivers/nvdimm/ocxl/main.c | 113 +++++++++++++++++++++++++++++++++
drivers/nvdimm/ocxl/ocxlpmem.h | 18 ++++++
include/uapi/linux/ndctl.h | 1 +
3 files changed, 132 insertions(+)

diff --git a/drivers/nvdimm/ocxl/main.c b/drivers/nvdimm/ocxl/main.c
index 2811bf7efbab..92b4389e8cbb 100644
--- a/drivers/nvdimm/ocxl/main.c
+++ b/drivers/nvdimm/ocxl/main.c
@@ -82,6 +82,114 @@ static int ndctl_config_size(struct nd_cmd_get_config_size *command)
return 0;
}

+/**
+ * smart_header_parse() - Parse the first 64 bits of the SMART admin command response
+ * @ocxlpmem: the device metadata
+ * @length: out, returns the number of bytes in the response (excluding the 64 bit header)
+ */
+static int smart_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 != 0x534D) { // 'SM'
+ dev_err(&ocxlpmem->dev,
+ "Bad data identifier for smart data, expected 'SM', got '%2s'\n",
+ (char *)&data_identifier);
+ return -EINVAL;
+ }
+
+ *length = data_length;
+ return 0;
+}
+
+static int ndctl_smart(struct ocxlpmem *ocxlpmem, struct nd_cmd_pkg *pkg)
+{
+ u32 length, i;
+ struct nd_ocxl_smart *out;
+ int rc;
+
+ mutex_lock(&ocxlpmem->admin_command.lock);
+
+ rc = admin_command_execute(ocxlpmem, ADMIN_COMMAND_SMART);
+ if (rc < 0)
+ goto out;
+ if (rc != STATUS_SUCCESS) {
+ warn_status(ocxlpmem, "Unexpected status from SMART", rc);
+ goto out;
+ }
+
+ rc = smart_header_parse(ocxlpmem, &length);
+ if (rc)
+ goto out;
+
+ pkg->nd_fw_size = length + offsetof(struct nd_ocxl_smart, attribs);
+
+ length = min(length, (u32)(pkg->nd_size_out -
+ offsetof(struct nd_ocxl_smart, attribs))); // bytes
+ out = (struct nd_ocxl_smart *)pkg->nd_payload;
+ // Each SMART attribute is 2 * 64 bits
+ out->count = length / (2 * sizeof(u64)); // attributes
+
+ for (i = 0; i < length; i += sizeof(u64)) {
+ rc = ocxl_global_mmio_read64(ocxlpmem->ocxl_afu,
+ ocxlpmem->admin_command.data_offset +
+ sizeof(u64) + i,
+ OCXL_LITTLE_ENDIAN,
+ &out->attribs[i / sizeof(u64)]);
+ if (rc)
+ goto out;
+ }
+
+ rc = admin_response_handled(ocxlpmem);
+ if (rc)
+ goto out;
+
+out:
+ mutex_unlock(&ocxlpmem->admin_command.lock);
+ return rc;
+}
+
+static int ndctl_call(struct ocxlpmem *ocxlpmem, void *buf,
+ unsigned int buf_len)
+{
+ struct nd_cmd_pkg *pkg = buf;
+
+ if (buf_len < sizeof(struct nd_cmd_pkg)) {
+ dev_err(&ocxlpmem->dev, "Invalid ND_CALL size=%u\n", buf_len);
+ return -EINVAL;
+ }
+
+ if (pkg->nd_family != NVDIMM_FAMILY_OCXL) {
+ dev_err(&ocxlpmem->dev, "Invalid ND_CALL family=0x%llx\n",
+ pkg->nd_family);
+ return -EINVAL;
+ }
+
+ switch (pkg->nd_command) {
+ case ND_CMD_OCXL_SMART:
+ return ndctl_smart(ocxlpmem, pkg);
+ default:
+ dev_err(&ocxlpmem->dev, "Invalid ND_CALL command=0x%llx\n",
+ pkg->nd_command);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
static int ndctl(struct nvdimm_bus_descriptor *nd_desc,
struct nvdimm *nvdimm,
unsigned int cmd, void *buf, unsigned int buf_len, int *cmd_rc)
@@ -90,6 +198,10 @@ static int ndctl(struct nvdimm_bus_descriptor *nd_desc,
struct ocxlpmem, bus_desc);

switch (cmd) {
+ case ND_CMD_CALL:
+ *cmd_rc = ndctl_call(ocxlpmem, buf, buf_len);
+ return 0;
+
case ND_CMD_GET_CONFIG_SIZE:
*cmd_rc = ndctl_config_size(buf);
return 0;
@@ -173,6 +285,7 @@ static int register_lpc_mem(struct ocxlpmem *ocxlpmem)
set_bit(ND_CMD_GET_CONFIG_SIZE, &nvdimm_cmd_mask);
set_bit(ND_CMD_GET_CONFIG_DATA, &nvdimm_cmd_mask);
set_bit(ND_CMD_SET_CONFIG_DATA, &nvdimm_cmd_mask);
+ set_bit(ND_CMD_CALL, &nvdimm_cmd_mask);

set_bit(NDD_ALIASING, &nvdimm_flags);

diff --git a/drivers/nvdimm/ocxl/ocxlpmem.h b/drivers/nvdimm/ocxl/ocxlpmem.h
index c8794e7775ec..ebaf11692c09 100644
--- a/drivers/nvdimm/ocxl/ocxlpmem.h
+++ b/drivers/nvdimm/ocxl/ocxlpmem.h
@@ -6,6 +6,7 @@
#include <misc/ocxl.h>
#include <linux/libnvdimm.h>
#include <linux/mm.h>
+#include <linux/ndctl.h>

#define LABEL_AREA_SIZE BIT_ULL(PA_SECTION_SHIFT)
#define DEFAULT_TIMEOUT 100
@@ -101,6 +102,23 @@ struct command_metadata {
u8 op_code;
};

+struct nd_ocxl_smart {
+ __u8 count;
+ __u8 reserved[7];
+ __u64 attribs[0];
+} __packed;
+
+struct nd_pkg_ocxl {
+ struct nd_cmd_pkg gen;
+ union {
+ struct nd_ocxl_smart smart;
+ };
+};
+
+enum nd_cmd_ocxl {
+ ND_CMD_OCXL_SMART = 1,
+};
+
struct ocxlpmem {
struct device dev;
struct pci_dev *pdev;
diff --git a/include/uapi/linux/ndctl.h b/include/uapi/linux/ndctl.h
index de5d90212409..2885052e7f40 100644
--- a/include/uapi/linux/ndctl.h
+++ b/include/uapi/linux/ndctl.h
@@ -244,6 +244,7 @@ struct nd_cmd_pkg {
#define NVDIMM_FAMILY_HPE2 2
#define NVDIMM_FAMILY_MSFT 3
#define NVDIMM_FAMILY_HYPERV 4
+#define NVDIMM_FAMILY_OCXL 6

#define ND_IOCTL_CALL _IOWR(ND_IOCTL, ND_CMD_CALL,\
struct nd_cmd_pkg)
--
2.24.1
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