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Petersen" Subject: [PATCH v9 12/13] scsi: sd_zbc: define storage element management operations Date: Sun, 15 Nov 2026 23:50:14 +0900 Message-ID: <20261115145015.938426-13-dlemoal@kernel.org> X-Mailer: git-send-email 2.56.0 In-Reply-To: <20261115145015.938426-1-dlemoal@kernel.org> References: <20261115145015.938426-1-dlemoal@kernel.org> X-Mailing-List: linux-scsi@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Define the storage element management operations using struct blk_se_ops. These operations are valid only on SMR disks supporting the storage element depopulation featu, with support for the GET PHYSICAL ELEMENTS STATUS command being mandatory. The support for the modify_zones operation is already indicated by the depop_modify_zones_supported SCSI disk flag. sd_zbc_check_depop_supported() is modified to add detection for the command RESTORE ELEMENTS AND REBUILD, which is indicated with the new SCSI disk flag depop_restore_supported. Both the remove_element and restore_elements operations will block until the operation completes or an error is detected. Signed-off-by: Damien Le Moal --- drivers/scsi/sd.c | 3 + drivers/scsi/sd.h | 3 + drivers/scsi/sd_zbc.c | 493 +++++++++++++++++++++++++++++++++++++++++- 3 files changed, 498 insertions(+), 1 deletion(-) diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c index dc45df819c42..34b44d72b2b7 100644 --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -3939,6 +3939,9 @@ static const struct block_device_operations sd_fops = { .get_unique_id = sd_get_unique_id, .free_disk = scsi_disk_free_disk, .pr_ops = &sd_pr_ops, +#ifdef CONFIG_BLK_DEV_ZONED + .se_ops = &sd_zbc_se_ops, +#endif }; /** diff --git a/drivers/scsi/sd.h b/drivers/scsi/sd.h index 84c87d0f05d8..8a32e5f771d8 100644 --- a/drivers/scsi/sd.h +++ b/drivers/scsi/sd.h @@ -158,6 +158,7 @@ struct scsi_disk { unsigned use_atomic_write_boundary : 1; unsigned depop_report_supported : 1; unsigned depop_modify_zones_supported : 1; + unsigned depop_restore_supported : 1; }; #define to_scsi_disk(obj) container_of(obj, struct scsi_disk, disk_dev) @@ -244,6 +245,8 @@ unsigned int sd_zbc_complete(struct scsi_cmnd *cmd, unsigned int good_bytes, int sd_zbc_report_zones(struct gendisk *disk, sector_t sector, unsigned int nr_zones, struct blk_report_zones_args *args); +extern const struct blk_se_ops sd_zbc_se_ops; + #else /* CONFIG_BLK_DEV_ZONED */ static inline int sd_zbc_read_zones(struct scsi_disk *sdkp, diff --git a/drivers/scsi/sd_zbc.c b/drivers/scsi/sd_zbc.c index bf2e60071d57..6322256028aa 100644 --- a/drivers/scsi/sd_zbc.c +++ b/drivers/scsi/sd_zbc.c @@ -12,6 +12,7 @@ #include #include #include +#include #include @@ -522,7 +523,8 @@ static int sd_zbc_check_capacity(struct scsi_disk *sdkp, unsigned char *buf, * @sdkp: Target SCSI disk * @buf: command buffer * - * Check if the device supports the REMOVE ELEMENT AND MODIFY ZONES command. + * Check if the device supports the storage elements depopulation management + * commands. */ static void sd_zbc_check_depop_supported(struct scsi_disk *sdkp, unsigned char *buf) @@ -534,6 +536,7 @@ static void sd_zbc_check_depop_supported(struct scsi_disk *sdkp, SAI_GET_PHYSICAL_ELEMENT_STATUS) == 1; if (!sdkp->depop_report_supported) { sdkp->depop_modify_zones_supported = false; + sdkp->depop_restore_supported = false; return; } @@ -541,6 +544,11 @@ static void sd_zbc_check_depop_supported(struct scsi_disk *sdkp, scsi_report_opcode(sdkp->device, buf, SD_BUF_SIZE, SERVICE_ACTION_IN_16, SAI_REMOVE_ELEMENT_AND_MODIFY_ZONES) == 1; + + sdkp->depop_restore_supported = + scsi_report_opcode(sdkp->device, buf, SD_BUF_SIZE, + SERVICE_ACTION_IN_16, + SAI_RESTORE_ELEMENTS_AND_REBUILD) == 1; } static void sd_zbc_print_zones(struct scsi_disk *sdkp) @@ -548,6 +556,11 @@ static void sd_zbc_print_zones(struct scsi_disk *sdkp) if (sdkp->device->type != TYPE_ZBC || !sdkp->capacity) return; + if (sdkp->depop_modify_zones_supported) + sd_printk(KERN_NOTICE, sdkp, "Depop modify zones supported\n"); + if (sdkp->depop_restore_supported) + sd_printk(KERN_NOTICE, sdkp, "Depop restoration supported\n"); + if (sdkp->capacity & (sdkp->zone_info.zone_blocks - 1)) sd_printk(KERN_NOTICE, sdkp, "%u zones of %u logical blocks + 1 runt zone\n", @@ -560,6 +573,484 @@ static void sd_zbc_print_zones(struct scsi_disk *sdkp) sdkp->zone_info.zone_blocks); } +static void sd_zbc_parse_storage_element(struct scsi_disk *sdkp, u8 *desc, + struct blk_se *element) +{ + struct scsi_device *sdp = sdkp->device; + sector_t zone_sectors = sd_zbc_zone_sectors(sdkp); + u64 capacity; + + memset(element, 0, sizeof(*element)); + + element->id = get_unaligned_be32(&desc[4]); + element->restore_allowed = desc[13] & 0x01; + + switch (desc[14]) { + case SCSI_PHYS_ELEM_TYPE_ALL_ACCESS_STORAGE: + element->type = BLK_SE_TYPE_RDWR; + capacity = get_unaligned_be64(&desc[16]); + if (!zone_sectors || capacity == ULLONG_MAX) + element->nr_zones = 0; + else + element->nr_zones = + logical_to_sectors(sdp, capacity) >> + ilog2(zone_sectors); + break; + case SCSI_PHYS_ELEM_TYPE_FRAC_ACCESS_STORAGE: + element->paired_id = get_unaligned_be32(&desc[16]); + if (desc[20] & 0x01) + element->type = BLK_SE_TYPE_READ; + else + element->type = BLK_SE_TYPE_WRITE; + element->nr_zones = get_unaligned_be64(&desc[24]); + break; + default: + element->type = BLK_SE_TYPE_UNKNOWN; + } + + if (desc[15] >= SCSI_PHYS_ELEM_HEALTH_WITHIN_SPEC_LIMITS_MIN && + desc[15] <= SCSI_PHYS_ELEM_HEALTH_WITHIN_SPEC_LIMITS_MAX) { + element->status = BLK_SE_STS_OK; + return; + } + + if (desc[15] >= SCSI_PHYS_ELEM_HEALTH_OUTSIDE_SPEC_LIMITS_MIN && + desc[15] <= SCSI_PHYS_ELEM_HEALTH_OUTSIDE_SPEC_LIMITS_MAX) { + element->status = BLK_SE_STS_DEGRADED; + return; + } + + switch (desc[15]) { + case SCSI_PHYS_ELEM_HEALTH_AT_SPEC_LIMITS: + element->status = BLK_SE_STS_OK_LIMIT; + break; + case SCSI_PHYS_ELEM_HEALTH_DEPOP_REVOKE_ERR: + element->status = BLK_SE_STS_RESTORE_ERROR; + break; + case SCSI_PHYS_ELEM_HEALTH_DEPOP_REVOKE_IN_PROGRESS: + element->status = BLK_SE_STS_RESTORE_IN_PROGRESS; + break; + case SCSI_PHYS_ELEM_HEALTH_DEPOP_ERR: + element->status = BLK_SE_STS_REMOVE_ERROR; + break; + case SCSI_PHYS_ELEM_HEALTH_DEPOP_IN_PROGRESS: + element->status = BLK_SE_STS_REMOVE_IN_PROGRESS; + break; + case SCSI_PHYS_ELEM_HEALTH_DEPOP_OK: + element->status = BLK_SE_STS_REMOVED; + break; + case SCSI_PHYS_ELEM_HEALTH_NOT_REPORTED: + default: + element->status = BLK_SE_STS_UNKNOWN; + break; + } +} + +/* + * Large hard limit on the number of storage elements. This accommodates all + * known devices today and likely forever :) + */ +#define SD_ZBC_MAX_STORAGE_ELEMENTS 255 + +struct sd_zbc_se_report { + struct blk_se *elements; + unsigned int nr_elements; + unsigned int nr_reported_elements; + bool need_free_elements; + u8 *buf; + unsigned int buf_size; +}; + +static int sd_zbc_alloc_se_report(struct blk_se *elements, + unsigned int nr_elements, + bool alloc_elements, + struct sd_zbc_se_report *rep) +{ + /* + * We need at least 32B for the report header and 32B for each + * descriptor. Note that we use GFP_KERNEL here, which may block. That + * is fine when called from ioctl context. When called from a file + * system, the FS can use memalloc_noio_save()/restore() or + * memalloc_nofs_save()/restore() if GFP_NOFS is required to avoid I/Os + * and/or FS re-entry. + */ + rep->need_free_elements = alloc_elements; + rep->nr_elements = min(SD_ZBC_MAX_STORAGE_ELEMENTS, nr_elements); + rep->buf_size = ALIGN((rep->nr_elements + 1) * 32, SECTOR_SIZE); + rep->buf = kzalloc(rep->buf_size, GFP_KERNEL); + if (!rep->buf) + return -ENOMEM; + + if (!alloc_elements) { + rep->elements = elements; + return 0; + } + + rep->elements = + kzalloc_objs(struct blk_se, rep->nr_elements, GFP_KERNEL); + if (!rep->elements) { + kfree(rep->buf); + return -ENOMEM; + } + + return 0; +} + +static void sd_zbc_free_se_report(struct sd_zbc_se_report *rep) +{ + kfree(rep->buf); + if (rep->need_free_elements) + kfree(rep->elements); +} + +static int sd_zbc_report_se(struct scsi_disk *sdkp, + struct sd_zbc_se_report *rep) +{ + struct scsi_device *sdp = sdkp->device; + const int timeout = sdp->request_queue->rq_timeout; + struct scsi_sense_hdr sshdr; + struct scsi_failure failure_defs[] = { + /* Allow up to retry 3 times */ + { + .result = SCMD_FAILURE_RESULT_ANY, + .allowed = 3, + }, + {} + }; + struct scsi_failures failures = { + .failure_definitions = failure_defs, + }; + const struct scsi_exec_args exec_args = { + .sshdr = &sshdr, + .failures = &failures, + }; + unsigned char cmd[16]; + unsigned int nr_descs; + int i, result; + u8 *desc; + + memset(cmd, 0, 16); + cmd[0] = SERVICE_ACTION_IN_16; + cmd[1] = SAI_GET_PHYSICAL_ELEMENT_STATUS; + put_unaligned_be32(rep->buf_size, &cmd[10]); + + result = scsi_execute_cmd(sdp, cmd, REQ_OP_DRV_IN, + rep->buf, rep->buf_size, timeout, 1, &exec_args); + if (result) { + if (result > 0) { + sd_print_result(sdkp, "GET PHYSICAL ELEMENT STATUS", + result); + if (scsi_sense_valid(&sshdr)) + sd_print_sense_hdr(sdkp, &sshdr); + return -EIO; + } + return result; + } + + nr_descs = get_unaligned_be32(&rep->buf[0]); + if (!nr_descs) { + sd_printk(KERN_ERR, sdkp, + "Invalid number of phys element descriptors\n"); + return -EIO; + } + if (nr_descs > SD_ZBC_MAX_STORAGE_ELEMENTS) { + sd_printk(KERN_ERR, sdkp, + "Too many phys element descriptors\n"); + return -EIO; + } + + if (!rep->elements) { + rep->nr_reported_elements = nr_descs; + return 0; + } + + rep->nr_reported_elements = + min(rep->nr_elements, get_unaligned_be32(&rep->buf[4])); + if (!rep->nr_reported_elements) { + sd_printk(KERN_ERR, sdkp, + "Invalid number of reported phys element descriptors\n"); + return -EIO; + } + + desc = &rep->buf[32]; + for (i = 0; i < rep->nr_reported_elements; i++, desc += 32) + sd_zbc_parse_storage_element(sdkp, desc, &rep->elements[i]); + + return 0; +} + +static int sd_zbc_report_storage_elements(struct gendisk *disk, + struct blk_se *elements, + unsigned int *nr_elements) +{ + struct scsi_disk *sdkp = scsi_disk(disk); + struct sd_zbc_se_report rep; + int ret; + + if (!sdkp->depop_report_supported) + return -EOPNOTSUPP; + + ret = sd_zbc_alloc_se_report(elements, *nr_elements, false, &rep); + if (ret) + return ret; + + ret = sd_zbc_report_se(sdkp, &rep); + if (!ret) + *nr_elements = rep.nr_reported_elements; + + sd_zbc_free_se_report(&rep); + + return ret; +} + +static int sd_zbc_execute_storage_element_cmd(struct scsi_disk *sdkp, + u8 action, u32 element_id) +{ + struct scsi_device *sdp = sdkp->device; + const int timeout = sdp->request_queue->rq_timeout; + struct scsi_sense_hdr sshdr; + const struct scsi_exec_args exec_args = { + .sshdr = &sshdr, + }; + unsigned char cmd[16]; + const char *cmd_name; + int result; + + memset(cmd, 0, sizeof(cmd)); + cmd[0] = SERVICE_ACTION_IN_16; + cmd[1] = action; + if (action == SAI_REMOVE_ELEMENT_AND_MODIFY_ZONES) { + put_unaligned_be32(element_id, &cmd[10]); + cmd_name = "REMOVE ELEMENT AND MODIFY ZONES"; + } else { + cmd_name = "RESTORE ELEMENTS AND REBUILD"; + } + + result = scsi_execute_cmd(sdp, cmd, REQ_OP_DRV_IN, NULL, 0, + timeout, 1, &exec_args); + if (result) { + sd_printk(KERN_ERR, sdkp, "%s failed\n", cmd_name); + if (result > 0) { + if (scsi_sense_valid(&sshdr)) + sd_print_sense_hdr(sdkp, &sshdr); + result = -EIO; + } + return result; + } + + return 0; +} + +/* + * Wait for the completion of a storage element remove operation. Note that the + * standards advise to use pollable sense data with the REQUEST SENSE command to + * detect if a remove operation is in progress. However, since REQUEST SENSE + * will return sense data only for the last executed command, and since we are + * not blocking commands, this method would be unreliable as we may end up + * seeing sense data (or no sense data) for a command that is not the REMOVE + * ELEMENT AND MODIFY ZONES we issued. + */ +static int sd_zbc_wait_for_se_removal(struct scsi_disk *sdkp, + struct sd_zbc_se_report *rep, + unsigned int element_id) +{ + bool element_checked, element_removed; + unsigned int i, in_progress; + int ret; + + /* + * Poll the storage elements health to see that we get the element we + * are interested in and that its removal completed. Since we do not + * know how long the operation may take, we cannot have a timeout on + * this loop. So check for fatal signals so that the user can terminate + * this loop if the device misbehaves. + */ + do { + /* Let the operation proceed and check. */ + msleep(1000); + + ret = sd_zbc_report_se(sdkp, rep); + if (ret) + return ret; + if (rep->nr_reported_elements != rep->nr_elements) + return -EIO; + + element_checked = false; + element_removed = false; + in_progress = 0; + for (i = 0; i < rep->nr_reported_elements; i++) { + if (rep->elements[i].id == element_id) + element_checked = true; + switch (rep->elements[i].status) { + case BLK_SE_STS_REMOVED: + if (rep->elements[i].id == element_id) + element_removed = true; + break; + case BLK_SE_STS_REMOVE_IN_PROGRESS: + in_progress++; + break; + default: + break; + } + } + + if (!element_checked) + return -EIO; + if (!in_progress) { + if (element_removed) + return 0; + return -EIO; + } + } while (!fatal_signal_pending(current)); + + return -EINTR; +} + +static int sd_zbc_remove_storage_element(struct gendisk *disk, + unsigned int element_id) +{ + struct scsi_disk *sdkp = scsi_disk(disk); + struct sd_zbc_se_report rep; + int ret; + + if (!sdkp->depop_modify_zones_supported) + return -EOPNOTSUPP; + + /* + * Get the resources we need to prepare for waiting for the operation to + * complete. + */ + ret = sd_zbc_alloc_se_report(NULL, disk->nr_storage_elements, + true, &rep); + if (ret) + return ret; + + /* + * Execute the remove command and wait for the element removal operation + * to complete. + */ + ret = sd_zbc_execute_storage_element_cmd(sdkp, + SAI_REMOVE_ELEMENT_AND_MODIFY_ZONES, element_id); + if (!ret) + ret = sd_zbc_wait_for_se_removal(sdkp, &rep, element_id); + if (!ret) + sd_printk(KERN_NOTICE, sdkp, + "Removed storage element %u\n", element_id); + + sd_zbc_free_se_report(&rep); + + return ret; +} + +/* + * Wait for the completion of the restoration of removed storage elements. + * See the note for sd_zbc_wait_for_se_removal(). + */ +static int sd_zbc_wait_for_se_restore(struct scsi_disk *sdkp, + struct sd_zbc_se_report *rep, + unsigned int in_error_orig) +{ + unsigned int i, in_error, in_progress; + int ret; + + /* + * Poll the storage elements health to see if we have any element still + * being restored or if we got errors. Since we do not know how long the + * operation may take, we cannot have a timeout on this loop. So check + * for fatal signals so that the user can terminate this retry loop if + * the device misbehaves. + */ + do { + /* Let the operation proceed and check. */ + msleep(1000); + + ret = sd_zbc_report_se(sdkp, rep); + if (ret) + return ret; + if (rep->nr_reported_elements != rep->nr_elements) + return -EIO; + + in_progress = 0; + in_error = 0; + for (i = 0; i < rep->nr_reported_elements; i++) { + switch (rep->elements[i].status) { + case BLK_SE_STS_RESTORE_IN_PROGRESS: + in_progress++; + break; + case BLK_SE_STS_RESTORE_ERROR: + in_error++; + break; + default: + break; + } + } + + if (!in_progress) { + if (in_error > in_error_orig) + return -EIO; + return 0; + } + } while (!fatal_signal_pending(current)); + + return -EINTR; +} + +static int sd_zbc_restore_storage_elements(struct gendisk *disk) +{ + struct scsi_disk *sdkp = scsi_disk(disk); + unsigned int i, in_error_orig = 0; + struct sd_zbc_se_report rep; + int ret; + + if (!sdkp->depop_restore_supported) + return -EOPNOTSUPP; + + /* + * Get the resources we need to prepare for waiting for the operation to + * complete. + */ + ret = sd_zbc_alloc_se_report(NULL, disk->nr_storage_elements, + true, &rep); + if (ret) + return ret; + + /* To detect restoration errors, count the number of such elements. */ + ret = sd_zbc_report_se(sdkp, &rep); + if (ret) + goto free; + if (rep.nr_reported_elements != rep.nr_elements) { + ret = -EIO; + goto free; + } + + for (i = 0; i < rep.nr_reported_elements; i++) { + if (rep.elements[i].status == BLK_SE_STS_RESTORE_ERROR) + in_error_orig++; + } + + /* + * Execute the restore command and wait for the elements restoration + * operation to complete. + */ + ret = sd_zbc_execute_storage_element_cmd(sdkp, + SAI_RESTORE_ELEMENTS_AND_REBUILD, 0); + if (!ret) + ret = sd_zbc_wait_for_se_restore(sdkp, &rep, in_error_orig); + if (!ret) + sd_printk(KERN_NOTICE, sdkp, "Restored storage elements\n"); + +free: + sd_zbc_free_se_report(&rep); + + return ret; +} + +const struct blk_se_ops sd_zbc_se_ops = { + .report_elements = sd_zbc_report_storage_elements, + .remove_element = sd_zbc_remove_storage_element, + .restore_elements = sd_zbc_restore_storage_elements, +}; + /* * Call blk_revalidate_disk_zones() if any of the zoned disk properties have * changed that make it necessary to call that function. Called by -- 2.56.0