diff options
Diffstat (limited to 'drivers/scsi/sd_zbc.c')
| -rw-r--r-- | drivers/scsi/sd_zbc.c | 169 |
1 files changed, 112 insertions, 57 deletions
diff --git a/drivers/scsi/sd_zbc.c b/drivers/scsi/sd_zbc.c index 8aa54779aac1..27793b9f54c0 100644 --- a/drivers/scsi/sd_zbc.c +++ b/drivers/scsi/sd_zbc.c @@ -28,38 +28,18 @@ #include <scsi/scsi.h> #include <scsi/scsi_cmnd.h> -#include <scsi/scsi_dbg.h> -#include <scsi/scsi_device.h> -#include <scsi/scsi_driver.h> -#include <scsi/scsi_host.h> -#include <scsi/scsi_eh.h> #include "sd.h" -#include "scsi_priv.h" - -enum zbc_zone_type { - ZBC_ZONE_TYPE_CONV = 0x1, - ZBC_ZONE_TYPE_SEQWRITE_REQ, - ZBC_ZONE_TYPE_SEQWRITE_PREF, - ZBC_ZONE_TYPE_RESERVED, -}; - -enum zbc_zone_cond { - ZBC_ZONE_COND_NO_WP, - ZBC_ZONE_COND_EMPTY, - ZBC_ZONE_COND_IMP_OPEN, - ZBC_ZONE_COND_EXP_OPEN, - ZBC_ZONE_COND_CLOSED, - ZBC_ZONE_COND_READONLY = 0xd, - ZBC_ZONE_COND_FULL, - ZBC_ZONE_COND_OFFLINE, -}; /** - * Convert a zone descriptor to a zone struct. + * sd_zbc_parse_report - Convert a zone descriptor to a struct blk_zone, + * @sdkp: The disk the report originated from + * @buf: Address of the report zone descriptor + * @zone: the destination zone structure + * + * All LBA sized values are converted to 512B sectors unit. */ -static void sd_zbc_parse_report(struct scsi_disk *sdkp, - u8 *buf, +static void sd_zbc_parse_report(struct scsi_disk *sdkp, u8 *buf, struct blk_zone *zone) { struct scsi_device *sdp = sdkp->device; @@ -82,7 +62,13 @@ static void sd_zbc_parse_report(struct scsi_disk *sdkp, } /** - * Issue a REPORT ZONES scsi command. + * sd_zbc_report_zones - Issue a REPORT ZONES scsi command. + * @sdkp: The target disk + * @buf: Buffer to use for the reply + * @buflen: the buffer size + * @lba: Start LBA of the report + * + * For internal use during device validation. */ static int sd_zbc_report_zones(struct scsi_disk *sdkp, unsigned char *buf, unsigned int buflen, sector_t lba) @@ -123,6 +109,12 @@ static int sd_zbc_report_zones(struct scsi_disk *sdkp, unsigned char *buf, return 0; } +/** + * sd_zbc_setup_report_cmnd - Prepare a REPORT ZONES scsi command + * @cmd: The command to setup + * + * Call in sd_init_command() for a REQ_OP_ZONE_REPORT request. + */ int sd_zbc_setup_report_cmnd(struct scsi_cmnd *cmd) { struct request *rq = cmd->request; @@ -165,6 +157,14 @@ int sd_zbc_setup_report_cmnd(struct scsi_cmnd *cmd) return BLKPREP_OK; } +/** + * sd_zbc_report_zones_complete - Process a REPORT ZONES scsi command reply. + * @scmd: The completed report zones command + * @good_bytes: reply size in bytes + * + * Convert all reported zone descriptors to struct blk_zone. The conversion + * is done in-place, directly in the request specified sg buffer. + */ static void sd_zbc_report_zones_complete(struct scsi_cmnd *scmd, unsigned int good_bytes) { @@ -220,17 +220,32 @@ static void sd_zbc_report_zones_complete(struct scsi_cmnd *scmd, local_irq_restore(flags); } +/** + * sd_zbc_zone_sectors - Get the device zone size in number of 512B sectors. + * @sdkp: The target disk + */ static inline sector_t sd_zbc_zone_sectors(struct scsi_disk *sdkp) { return logical_to_sectors(sdkp->device, sdkp->zone_blocks); } +/** + * sd_zbc_zone_no - Get the number of the zone conataining a sector. + * @sdkp: The target disk + * @sector: 512B sector address contained in the zone + */ static inline unsigned int sd_zbc_zone_no(struct scsi_disk *sdkp, sector_t sector) { return sectors_to_logical(sdkp->device, sector) >> sdkp->zone_shift; } +/** + * sd_zbc_setup_reset_cmnd - Prepare a RESET WRITE POINTER scsi command. + * @cmd: the command to setup + * + * Called from sd_init_command() for a REQ_OP_ZONE_RESET request. + */ int sd_zbc_setup_reset_cmnd(struct scsi_cmnd *cmd) { struct request *rq = cmd->request; @@ -263,6 +278,23 @@ int sd_zbc_setup_reset_cmnd(struct scsi_cmnd *cmd) return BLKPREP_OK; } +/** + * sd_zbc_write_lock_zone - Write lock a sequential zone. + * @cmd: write command + * + * Called from sd_init_cmd() for write requests (standard write, write same or + * write zeroes operations). If the request target zone is not already locked, + * the zone is locked and BLKPREP_OK returned, allowing the request to proceed + * through dispatch in scsi_request_fn(). Otherwise, BLKPREP_DEFER is returned, + * forcing the request to wait for the zone to be unlocked, that is, for the + * previously issued write request targeting the same zone to complete. + * + * This is called from blk_peek_request() context with the queue lock held and + * before the request is removed from the scheduler. As a result, multiple + * contexts executing concurrently scsi_request_fn() cannot result in write + * sequence reordering as only a single write request per zone is allowed to + * proceed. + */ int sd_zbc_write_lock_zone(struct scsi_cmnd *cmd) { struct request *rq = cmd->request; @@ -285,10 +317,7 @@ int sd_zbc_write_lock_zone(struct scsi_cmnd *cmd) * Do not issue more than one write at a time per * zone. This solves write ordering problems due to * the unlocking of the request queue in the dispatch - * path in the non scsi-mq case. For scsi-mq, this - * also avoids potential write reordering when multiple - * threads running on different CPUs write to the same - * zone (with a synchronized sequential pattern). + * path in the non scsi-mq case. */ if (sdkp->zones_wlock && test_and_set_bit(zno, sdkp->zones_wlock)) @@ -300,6 +329,13 @@ int sd_zbc_write_lock_zone(struct scsi_cmnd *cmd) return BLKPREP_OK; } +/** + * sd_zbc_write_unlock_zone - Write unlock a sequential zone. + * @cmd: write command + * + * Called from sd_uninit_cmd(). Unlocking the request target zone will allow + * dispatching the next write request for the zone. + */ void sd_zbc_write_unlock_zone(struct scsi_cmnd *cmd) { struct request *rq = cmd->request; @@ -314,8 +350,16 @@ void sd_zbc_write_unlock_zone(struct scsi_cmnd *cmd) } } -void sd_zbc_complete(struct scsi_cmnd *cmd, - unsigned int good_bytes, +/** + * sd_zbc_complete - ZBC command post processing. + * @cmd: Completed command + * @good_bytes: Command reply bytes + * @sshdr: command sense header + * + * Called from sd_done(). Process report zones reply and handle reset zone + * and write commands errors. + */ +void sd_zbc_complete(struct scsi_cmnd *cmd, unsigned int good_bytes, struct scsi_sense_hdr *sshdr) { int result = cmd->result; @@ -360,7 +404,11 @@ void sd_zbc_complete(struct scsi_cmnd *cmd, } /** - * Read zoned block device characteristics (VPD page B6). + * sd_zbc_read_zoned_characteristics - Read zoned block device characteristics + * @sdkp: Target disk + * @buf: Buffer where to store the VPD page data + * + * Read VPD page B6. */ static int sd_zbc_read_zoned_characteristics(struct scsi_disk *sdkp, unsigned char *buf) @@ -375,25 +423,31 @@ static int sd_zbc_read_zoned_characteristics(struct scsi_disk *sdkp, if (sdkp->device->type != TYPE_ZBC) { /* Host-aware */ sdkp->urswrz = 1; - sdkp->zones_optimal_open = get_unaligned_be64(&buf[8]); - sdkp->zones_optimal_nonseq = get_unaligned_be64(&buf[12]); + sdkp->zones_optimal_open = get_unaligned_be32(&buf[8]); + sdkp->zones_optimal_nonseq = get_unaligned_be32(&buf[12]); sdkp->zones_max_open = 0; } else { /* Host-managed */ sdkp->urswrz = buf[4] & 1; sdkp->zones_optimal_open = 0; sdkp->zones_optimal_nonseq = 0; - sdkp->zones_max_open = get_unaligned_be64(&buf[16]); + sdkp->zones_max_open = get_unaligned_be32(&buf[16]); } return 0; } /** - * Check reported capacity. + * sd_zbc_check_capacity - Check reported capacity. + * @sdkp: Target disk + * @buf: Buffer to use for commands + * + * ZBC drive may report only the capacity of the first conventional zones at + * LBA 0. This is indicated by the RC_BASIS field of the read capacity reply. + * Check this here. If the disk reported only its conventional zones capacity, + * get the total capacity by doing a report zones. */ -static int sd_zbc_check_capacity(struct scsi_disk *sdkp, - unsigned char *buf) +static int sd_zbc_check_capacity(struct scsi_disk *sdkp, unsigned char *buf) { sector_t lba; int ret; @@ -421,8 +475,15 @@ static int sd_zbc_check_capacity(struct scsi_disk *sdkp, return 0; } -#define SD_ZBC_BUF_SIZE 131072 +#define SD_ZBC_BUF_SIZE 131072U +/** + * sd_zbc_check_zone_size - Check the device zone sizes + * @sdkp: Target disk + * + * Check that all zones of the device are equal. The last zone can however + * be smaller. The zone size must also be a power of two number of LBAs. + */ static int sd_zbc_check_zone_size(struct scsi_disk *sdkp) { u64 zone_blocks; @@ -465,10 +526,7 @@ static int sd_zbc_check_zone_size(struct scsi_disk *sdkp) /* Parse REPORT ZONES header */ list_length = get_unaligned_be32(&buf[0]) + 64; rec = buf + 64; - if (list_length < SD_ZBC_BUF_SIZE) - buf_len = list_length; - else - buf_len = SD_ZBC_BUF_SIZE; + buf_len = min(list_length, SD_ZBC_BUF_SIZE); /* Parse zone descriptors */ while (rec < buf + buf_len) { @@ -523,6 +581,7 @@ out: } sdkp->zone_blocks = zone_blocks; + sdkp->zone_shift = ilog2(zone_blocks); return 0; } @@ -530,13 +589,15 @@ out: static int sd_zbc_setup(struct scsi_disk *sdkp) { + /* READ16/WRITE16 is mandatory for ZBC disks */ + sdkp->device->use_16_for_rw = 1; + sdkp->device->use_10_for_rw = 0; + /* chunk_sectors indicates the zone size */ blk_queue_chunk_sectors(sdkp->disk->queue, logical_to_sectors(sdkp->device, sdkp->zone_blocks)); - sdkp->zone_shift = ilog2(sdkp->zone_blocks); - sdkp->nr_zones = sdkp->capacity >> sdkp->zone_shift; - if (sdkp->capacity & (sdkp->zone_blocks - 1)) - sdkp->nr_zones++; + sdkp->nr_zones = + round_up(sdkp->capacity, sdkp->zone_blocks) >> sdkp->zone_shift; if (!sdkp->zones_wlock) { sdkp->zones_wlock = kcalloc(BITS_TO_LONGS(sdkp->nr_zones), @@ -549,8 +610,7 @@ static int sd_zbc_setup(struct scsi_disk *sdkp) return 0; } -int sd_zbc_read_zones(struct scsi_disk *sdkp, - unsigned char *buf) +int sd_zbc_read_zones(struct scsi_disk *sdkp, unsigned char *buf) { int ret; @@ -561,7 +621,6 @@ int sd_zbc_read_zones(struct scsi_disk *sdkp, */ return 0; - /* Get zoned block device characteristics */ ret = sd_zbc_read_zoned_characteristics(sdkp, buf); if (ret) @@ -598,10 +657,6 @@ int sd_zbc_read_zones(struct scsi_disk *sdkp, if (ret) goto err; - /* READ16/WRITE16 is mandatory for ZBC disks */ - sdkp->device->use_16_for_rw = 1; - sdkp->device->use_10_for_rw = 0; - return 0; err: |