Define the storage element management operations using struct blk_storage_elements_ops. These operations are valid only on SMR disks supporting the storage element depopulation feature. Signed-off-by: Damien Le Moal --- drivers/scsi/sd.c | 3 + drivers/scsi/sd.h | 2 + drivers/scsi/sd_zbc.c | 233 ++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 238 insertions(+) diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c index db7c19d1c2ff..48c46f4a1ace 100644 --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -3943,6 +3943,9 @@ 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 6a72371fee78..fc8c49903811 100644 --- a/drivers/scsi/sd.h +++ b/drivers/scsi/sd.h @@ -243,6 +243,8 @@ 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 2c77f878ab3f..39cd4f9fcce5 100644 --- a/drivers/scsi/sd_zbc.c +++ b/drivers/scsi/sd_zbc.c @@ -548,6 +548,239 @@ 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]); + + 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; + } + + switch (desc[15]) { + case SCSI_PHYS_ELEM_HEALTH_WITHIN_SPEC_LIMITS: + case SCSI_PHYS_ELEM_HEALTH_AT_SPEC_LIMITS: + element->status = BLK_SE_STS_OK; + break; + case SCSI_PHYS_ELEM_HEALTH_OUTSIDE_SPEC_LIMITS: + element->status = BLK_SE_STS_DEGRADED; + 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; + element->restore_allowed = desc[13] & 0x01; + 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 + +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 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]; + unsigned int nr_descs, nr_se; + unsigned int buf_size; + int i, ret = 0, result; + u8 *desc, *buf; + + if (!sdkp->modify_zones_supported) + return -EOPNOTSUPP; + + /* + * We need at least 32B for the report header and 32B for each + * descriptor. + */ + nr_se = min(SD_ZBC_MAX_STORAGE_ELEMENTS, *nr_elements); + buf_size = ALIGN((nr_se + 1) * 32, SECTOR_SIZE); + + buf = kzalloc(buf_size, GFP_NOIO); + if (!buf) + return -ENOMEM; + + memset(cmd, 0, 16); + cmd[0] = SERVICE_ACTION_IN_16; + cmd[1] = SAI_GET_PHYSICAL_ELEMENT_STATUS; + put_unaligned_be32(buf_size, &cmd[10]); + + result = scsi_execute_cmd(sdp, cmd, REQ_OP_DRV_IN, buf, buf_size, + timeout, 1, &exec_args); + if (result) { + sd_printk(KERN_ERR, sdkp, + "GET PHYSICAL ELEMENT STATUS failed\n"); + sd_print_result(sdkp, "GET PHYSICAL ELEMENT STATUS", result); + if (result > 0 && scsi_sense_valid(&sshdr)) + sd_print_sense_hdr(sdkp, &sshdr); + ret = -EIO; + goto free_buf; + } + + nr_descs = get_unaligned_be32(&buf[0]); + if (!nr_descs) { + sd_printk(KERN_ERR, sdkp, + "Invalid number of phys element descriptors\n"); + ret = -EIO; + goto free_buf; + } + if (nr_descs > SD_ZBC_MAX_STORAGE_ELEMENTS) { + sd_printk(KERN_ERR, sdkp, + "Too many phys element descriptors\n"); + ret = -EIO; + goto free_buf; + } + + if (!elements) { + *nr_elements = nr_descs; + goto free_buf; + } + + nr_descs = get_unaligned_be32(&buf[4]); + if (!nr_descs) { + sd_printk(KERN_ERR, sdkp, + "Invalid number of reported phys element descriptors\n"); + ret = -EIO; + goto free_buf; + } + + desc = &buf[32]; + for (i = 0; i < min(nr_se, nr_descs); i++, desc += 32) + sd_zbc_parse_storage_element(sdkp, desc, &elements[i]); + *nr_elements = i; + +free_buf: + kfree(buf); + + return ret; +} + +static int sd_zbc_remove_storage_element(struct gendisk *disk, + unsigned int element_id) +{ + struct scsi_disk *sdkp = scsi_disk(disk); + 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]; + int result; + + if (!sdkp->modify_zones_supported) + return -EOPNOTSUPP; + + memset(cmd, 0, 16); + cmd[0] = SERVICE_ACTION_IN_16; + cmd[1] = SAI_REMOVE_ELEMENT_AND_MODIFY_ZONES; + put_unaligned_be32(element_id, &cmd[10]); + + result = scsi_execute_cmd(sdp, cmd, REQ_OP_DRV_IN, NULL, 0, + timeout, 1, &exec_args); + if (result) { + sd_printk(KERN_ERR, sdkp, + "REMOVE ELEMENT AND MODIFY ZONES failed\n"); + sd_print_result(sdkp, + "REMOVE ELEMENT AND MODIFY ZONES", result); + if (result > 0 && scsi_sense_valid(&sshdr)) + sd_print_sense_hdr(sdkp, &sshdr); + return -EIO; + } + + return 0; +} + +static int sd_zbc_restore_storage_elements(struct gendisk *disk) +{ + struct scsi_disk *sdkp = scsi_disk(disk); + 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]; + int result; + + if (!sdkp->modify_zones_supported) + return -EOPNOTSUPP; + + memset(cmd, 0, 16); + cmd[0] = SERVICE_ACTION_IN_16; + cmd[1] = SAI_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, + "RESTORE ELEMENTS AND REBUILD failed\n"); + sd_print_result(sdkp, + "RESTORE ELEMENTS AND REBUILD", result); + if (result > 0 && scsi_sense_valid(&sshdr)) + sd_print_sense_hdr(sdkp, &sshdr); + return -EIO; + } + + return 0; +} + +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 -- 2.55.0