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SubjectRe: [PATCH v3 24/27] powerpc/powernv/pmem: Expose SMART data via ndctl
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Le 21/02/2020 à 04:27, Alastair D'Silva a écrit :
> From: Alastair D'Silva <alastair@d-silva.org>
>
> 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>
> ---


Nothing new to add compared to previous patches with similarities.

Fred



> arch/powerpc/platforms/powernv/pmem/ocxl.c | 128 ++++++++++++++++++
> .../platforms/powernv/pmem/ocxl_internal.h | 18 +++
> include/uapi/linux/ndctl.h | 1 +
> 3 files changed, 147 insertions(+)
>
> diff --git a/arch/powerpc/platforms/powernv/pmem/ocxl.c b/arch/powerpc/platforms/powernv/pmem/ocxl.c
> index d4ce5e9e0521..5cd1b6d78dd6 100644
> --- a/arch/powerpc/platforms/powernv/pmem/ocxl.c
> +++ b/arch/powerpc/platforms/powernv/pmem/ocxl.c
> @@ -81,6 +81,129 @@ 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 '%-.*s'\n",
> + 2, (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_request(ocxlpmem, ADMIN_COMMAND_SMART);
> + if (rc)
> + goto out;
> +
> + rc = admin_command_execute(ocxlpmem);
> + if (rc)
> + goto out;
> +
> + rc = admin_command_complete_timeout(ocxlpmem, ADMIN_COMMAND_SMART);
> + if (rc < 0) {
> + dev_err(&ocxlpmem->dev, "SMART timeout\n");
> + goto out;
> + }
> +
> + rc = admin_response(ocxlpmem);
> + 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;
> +
> + length = min(length, pkg->nd_size_out); // 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;
> +
> + rc = 0;
> + 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:
> + ndctl_smart(ocxlpmem, pkg);
> + break;
> +
> + 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)
> @@ -88,6 +211,10 @@ static int ndctl(struct nvdimm_bus_descriptor *nd_desc,
> struct ocxlpmem *ocxlpmem = container_of(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;
> @@ -171,6 +298,7 @@ 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/arch/powerpc/platforms/powernv/pmem/ocxl_internal.h b/arch/powerpc/platforms/powernv/pmem/ocxl_internal.h
> index 927690f4888f..0eb7a35d24ae 100644
> --- a/arch/powerpc/platforms/powernv/pmem/ocxl_internal.h
> +++ b/arch/powerpc/platforms/powernv/pmem/ocxl_internal.h
> @@ -7,6 +7,7 @@
> #include <linux/libnvdimm.h>
> #include <uapi/nvdimm/ocxl-pmem.h>
> #include <linux/mm.h>
> +#include <linux/ndctl.h>
>
> #define LABEL_AREA_SIZE (1UL << PA_SECTION_SHIFT)
> #define DEFAULT_TIMEOUT 100
> @@ -98,6 +99,23 @@ struct ocxlpmem_function0 {
> struct ocxl_fn *ocxl_fn;
> };
>
> +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)
>

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