Add libcxl interfaces to allow performinfg label (LSA) manipulations. Add a 'cxl_cmd_new_set_lsa' interface to create a 'Set LSA' mailbox command payload, and interfaces to read, write, and zero the LSA area on a memdev.
Cc: Dan Williams <[email protected]> Signed-off-by: Vishal Verma <[email protected]> --- cxl/lib/private.h | 6 ++ cxl/lib/libcxl.c | 137 +++++++++++++++++++++++++++++++++++++++++++++ cxl/libcxl.h | 7 +++ cxl/lib/libcxl.sym | 4 ++ 4 files changed, 154 insertions(+) diff --git a/cxl/lib/private.h b/cxl/lib/private.h index 671f12f..89212df 100644 --- a/cxl/lib/private.h +++ b/cxl/lib/private.h @@ -79,6 +79,12 @@ struct cxl_cmd_get_lsa_in { le32 length; } __attribute__((packed)); +struct cxl_cmd_set_lsa { + le32 offset; + le32 rsvd; + unsigned char lsa_data[0]; +} __attribute__ ((packed)); + struct cxl_cmd_get_health_info { u8 health_status; u8 media_status; diff --git a/cxl/lib/libcxl.c b/cxl/lib/libcxl.c index 59d091c..8dd69cf 100644 --- a/cxl/lib/libcxl.c +++ b/cxl/lib/libcxl.c @@ -1126,3 +1126,140 @@ CXL_EXPORT int cxl_cmd_get_out_size(struct cxl_cmd *cmd) { return cmd->send_cmd->out.size; } + +CXL_EXPORT struct cxl_cmd *cxl_cmd_new_write_label(struct cxl_memdev *memdev, + void *lsa_buf, unsigned int offset, unsigned int length) +{ + struct cxl_ctx *ctx = cxl_memdev_get_ctx(memdev); + struct cxl_cmd_set_lsa *set_lsa; + struct cxl_cmd *cmd; + int rc; + + cmd = cxl_cmd_new_generic(memdev, CXL_MEM_COMMAND_ID_SET_LSA); + if (!cmd) + return NULL; + + /* this will allocate 'in.payload' */ + rc = cxl_cmd_set_input_payload(cmd, NULL, sizeof(*set_lsa) + length); + if (rc) { + err(ctx, "%s: cmd setup failed: %s\n", + cxl_memdev_get_devname(memdev), strerror(-rc)); + goto out_fail; + } + set_lsa = (void *)cmd->send_cmd->in.payload; + set_lsa->offset = cpu_to_le32(offset); + memcpy(set_lsa->lsa_data, lsa_buf, length); + + return cmd; + +out_fail: + cxl_cmd_unref(cmd); + return NULL; +} + +enum lsa_op { + LSA_OP_GET, + LSA_OP_SET, + LSA_OP_ZERO, +}; + +static int lsa_op(struct cxl_memdev *memdev, int op, void **buf, + size_t length, size_t offset) +{ + const char *devname = cxl_memdev_get_devname(memdev); + struct cxl_ctx *ctx = cxl_memdev_get_ctx(memdev); + struct cxl_cmd *cmd; + void *zero_buf = NULL; + ssize_t ret_len; + int rc = 0; + + if (op != LSA_OP_ZERO && (buf == NULL || *buf == NULL)) { + err(ctx, "%s: LSA buffer cannot be NULL\n", devname); + return -EINVAL; + } + + /* TODO: handle the case for offset + len > mailbox payload size */ + switch (op) { + case LSA_OP_GET: + if (length == 0) + length = memdev->lsa_size; + cmd = cxl_cmd_new_read_label(memdev, offset, length); + if (!cmd) + return -ENOMEM; + rc = cxl_cmd_set_output_payload(cmd, *buf, length); + if (rc) { + err(ctx, "%s: cmd setup failed: %s\n", + cxl_memdev_get_devname(memdev), strerror(-rc)); + goto out; + } + break; + case LSA_OP_ZERO: + if (length == 0) + length = memdev->lsa_size; + zero_buf = calloc(1, length); + if (!zero_buf) + return -ENOMEM; + buf = &zero_buf; + /* fall through */ + case LSA_OP_SET: + cmd = cxl_cmd_new_write_label(memdev, *buf, offset, length); + if (!cmd) { + rc = -ENOMEM; + goto out_free; + } + break; + default: + return -EOPNOTSUPP; + } + + rc = cxl_cmd_submit(cmd); + if (rc < 0) { + err(ctx, "%s: cmd submission failed: %s\n", + devname, strerror(-rc)); + goto out; + } + + rc = cxl_cmd_get_mbox_status(cmd); + if (rc != 0) { + err(ctx, "%s: firmware status: %d\n", + devname, rc); + rc = -ENXIO; + goto out; + } + + if (op == LSA_OP_GET) { + ret_len = cxl_cmd_read_label_get_payload(cmd, *buf, length); + if (ret_len < 0) { + rc = ret_len; + goto out; + } + } + + /* + * TODO: If writing, the memdev may need to be disabled/re-enabled to + * refresh any cached LSA data in the kernel. + */ + +out: + cxl_cmd_unref(cmd); +out_free: + free(zero_buf); + return rc; +} + +CXL_EXPORT int cxl_memdev_zero_label(struct cxl_memdev *memdev) +{ + return lsa_op(memdev, LSA_OP_ZERO, NULL, 0, 0); +} + +CXL_EXPORT int cxl_memdev_write_label(struct cxl_memdev *memdev, void *buf, + size_t length, size_t offset) +{ + return lsa_op(memdev, LSA_OP_SET, &buf, length, offset); +} + +CXL_EXPORT int cxl_memdev_read_label(struct cxl_memdev *memdev, void *buf, + size_t length, size_t offset) +{ + return lsa_op(memdev, LSA_OP_GET, &buf, length, offset); +} diff --git a/cxl/libcxl.h b/cxl/libcxl.h index 2e24371..a832806 100644 --- a/cxl/libcxl.h +++ b/cxl/libcxl.h @@ -44,6 +44,11 @@ unsigned long long cxl_memdev_get_ram_size(struct cxl_memdev *memdev); const char *cxl_memdev_get_firmware_verison(struct cxl_memdev *memdev); size_t cxl_memdev_get_label_size(struct cxl_memdev *memdev); int cxl_memdev_is_active(struct cxl_memdev *memdev); +int cxl_memdev_zero_label(struct cxl_memdev *memdev); +int cxl_memdev_read_label(struct cxl_memdev *memdev, void *buf, size_t length, + size_t offset); +int cxl_memdev_write_label(struct cxl_memdev *memdev, void *buf, size_t length, + size_t offset); #define cxl_memdev_foreach(ctx, memdev) \ for (memdev = cxl_memdev_get_first(ctx); \ @@ -101,6 +106,8 @@ struct cxl_cmd *cxl_cmd_new_read_label(struct cxl_memdev *memdev, unsigned int offset, unsigned int length); ssize_t cxl_cmd_read_label_get_payload(struct cxl_cmd *cmd, void *buf, unsigned int length); +struct cxl_cmd *cxl_cmd_new_write_label(struct cxl_memdev *memdev, + void *buf, unsigned int offset, unsigned int length); #ifdef __cplusplus } /* extern "C" */ diff --git a/cxl/lib/libcxl.sym b/cxl/lib/libcxl.sym index 0e82030..490d6da 100644 --- a/cxl/lib/libcxl.sym +++ b/cxl/lib/libcxl.sym @@ -80,4 +80,8 @@ LIBCXL_4 { global: cxl_memdev_get_label_size; cxl_memdev_is_active; + cxl_cmd_new_write_label; + cxl_memdev_zero_label; + cxl_memdev_write_label; + cxl_memdev_read_label; } LIBCXL_3; -- 2.31.1
