| // SPDX-License-Identifier: GPL-2.0 |
| #include <linux/vmalloc.h> |
| #include "null_blk.h" |
| |
| #define CREATE_TRACE_POINTS |
| #include "null_blk_trace.h" |
| |
| /* zone_size in MBs to sectors. */ |
| #define ZONE_SIZE_SHIFT 11 |
| |
| static inline unsigned int null_zone_no(struct nullb_device *dev, sector_t sect) |
| { |
| return sect >> ilog2(dev->zone_size_sects); |
| } |
| |
| int null_init_zoned_dev(struct nullb_device *dev, struct request_queue *q) |
| { |
| sector_t dev_size = (sector_t)dev->size * 1024 * 1024; |
| sector_t sector = 0; |
| unsigned int i; |
| |
| if (!is_power_of_2(dev->zone_size)) { |
| pr_err("zone_size must be power-of-two\n"); |
| return -EINVAL; |
| } |
| if (dev->zone_size > dev->size) { |
| pr_err("Zone size larger than device capacity\n"); |
| return -EINVAL; |
| } |
| |
| dev->zone_size_sects = dev->zone_size << ZONE_SIZE_SHIFT; |
| dev->nr_zones = dev_size >> |
| (SECTOR_SHIFT + ilog2(dev->zone_size_sects)); |
| dev->zones = kvmalloc_array(dev->nr_zones, sizeof(struct blk_zone), |
| GFP_KERNEL | __GFP_ZERO); |
| if (!dev->zones) |
| return -ENOMEM; |
| |
| if (dev->zone_nr_conv >= dev->nr_zones) { |
| dev->zone_nr_conv = dev->nr_zones - 1; |
| pr_info("changed the number of conventional zones to %u", |
| dev->zone_nr_conv); |
| } |
| |
| for (i = 0; i < dev->zone_nr_conv; i++) { |
| struct blk_zone *zone = &dev->zones[i]; |
| |
| zone->start = sector; |
| zone->len = dev->zone_size_sects; |
| zone->wp = zone->start + zone->len; |
| zone->type = BLK_ZONE_TYPE_CONVENTIONAL; |
| zone->cond = BLK_ZONE_COND_NOT_WP; |
| |
| sector += dev->zone_size_sects; |
| } |
| |
| for (i = dev->zone_nr_conv; i < dev->nr_zones; i++) { |
| struct blk_zone *zone = &dev->zones[i]; |
| |
| zone->start = zone->wp = sector; |
| zone->len = dev->zone_size_sects; |
| zone->type = BLK_ZONE_TYPE_SEQWRITE_REQ; |
| zone->cond = BLK_ZONE_COND_EMPTY; |
| |
| sector += dev->zone_size_sects; |
| } |
| |
| q->limits.zoned = BLK_ZONED_HM; |
| blk_queue_flag_set(QUEUE_FLAG_ZONE_RESETALL, q); |
| blk_queue_required_elevator_features(q, ELEVATOR_F_ZBD_SEQ_WRITE); |
| |
| return 0; |
| } |
| |
| int null_register_zoned_dev(struct nullb *nullb) |
| { |
| struct nullb_device *dev = nullb->dev; |
| struct request_queue *q = nullb->q; |
| |
| if (queue_is_mq(q)) { |
| int ret = blk_revalidate_disk_zones(nullb->disk, NULL); |
| |
| if (ret) |
| return ret; |
| } else { |
| blk_queue_chunk_sectors(q, dev->zone_size_sects); |
| q->nr_zones = blkdev_nr_zones(nullb->disk); |
| } |
| |
| blk_queue_max_zone_append_sectors(q, dev->zone_size_sects); |
| |
| return 0; |
| } |
| |
| void null_free_zoned_dev(struct nullb_device *dev) |
| { |
| kvfree(dev->zones); |
| } |
| |
| int null_report_zones(struct gendisk *disk, sector_t sector, |
| unsigned int nr_zones, report_zones_cb cb, void *data) |
| { |
| struct nullb *nullb = disk->private_data; |
| struct nullb_device *dev = nullb->dev; |
| unsigned int first_zone, i; |
| struct blk_zone zone; |
| int error; |
| |
| first_zone = null_zone_no(dev, sector); |
| if (first_zone >= dev->nr_zones) |
| return 0; |
| |
| nr_zones = min(nr_zones, dev->nr_zones - first_zone); |
| trace_nullb_report_zones(nullb, nr_zones); |
| |
| for (i = 0; i < nr_zones; i++) { |
| /* |
| * Stacked DM target drivers will remap the zone information by |
| * modifying the zone information passed to the report callback. |
| * So use a local copy to avoid corruption of the device zone |
| * array. |
| */ |
| memcpy(&zone, &dev->zones[first_zone + i], |
| sizeof(struct blk_zone)); |
| error = cb(&zone, i, data); |
| if (error) |
| return error; |
| } |
| |
| return nr_zones; |
| } |
| |
| size_t null_zone_valid_read_len(struct nullb *nullb, |
| sector_t sector, unsigned int len) |
| { |
| struct nullb_device *dev = nullb->dev; |
| struct blk_zone *zone = &dev->zones[null_zone_no(dev, sector)]; |
| unsigned int nr_sectors = len >> SECTOR_SHIFT; |
| |
| /* Read must be below the write pointer position */ |
| if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL || |
| sector + nr_sectors <= zone->wp) |
| return len; |
| |
| if (sector > zone->wp) |
| return 0; |
| |
| return (zone->wp - sector) << SECTOR_SHIFT; |
| } |
| |
| static blk_status_t null_zone_write(struct nullb_cmd *cmd, sector_t sector, |
| unsigned int nr_sectors, bool append) |
| { |
| struct nullb_device *dev = cmd->nq->dev; |
| unsigned int zno = null_zone_no(dev, sector); |
| struct blk_zone *zone = &dev->zones[zno]; |
| blk_status_t ret; |
| |
| trace_nullb_zone_op(cmd, zno, zone->cond); |
| |
| if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL) |
| return null_process_cmd(cmd, REQ_OP_WRITE, sector, nr_sectors); |
| |
| switch (zone->cond) { |
| case BLK_ZONE_COND_FULL: |
| /* Cannot write to a full zone */ |
| return BLK_STS_IOERR; |
| case BLK_ZONE_COND_EMPTY: |
| case BLK_ZONE_COND_IMP_OPEN: |
| case BLK_ZONE_COND_EXP_OPEN: |
| case BLK_ZONE_COND_CLOSED: |
| /* |
| * Regular writes must be at the write pointer position. |
| * Zone append writes are automatically issued at the write |
| * pointer and the position returned using the request or BIO |
| * sector. |
| */ |
| if (append) { |
| sector = zone->wp; |
| if (cmd->bio) |
| cmd->bio->bi_iter.bi_sector = sector; |
| else |
| cmd->rq->__sector = sector; |
| } else if (sector != zone->wp) { |
| return BLK_STS_IOERR; |
| } |
| |
| if (zone->cond != BLK_ZONE_COND_EXP_OPEN) |
| zone->cond = BLK_ZONE_COND_IMP_OPEN; |
| |
| ret = null_process_cmd(cmd, REQ_OP_WRITE, sector, nr_sectors); |
| if (ret != BLK_STS_OK) |
| return ret; |
| |
| zone->wp += nr_sectors; |
| if (zone->wp == zone->start + zone->len) |
| zone->cond = BLK_ZONE_COND_FULL; |
| return BLK_STS_OK; |
| default: |
| /* Invalid zone condition */ |
| return BLK_STS_IOERR; |
| } |
| } |
| |
| static blk_status_t null_zone_mgmt(struct nullb_cmd *cmd, enum req_opf op, |
| sector_t sector) |
| { |
| struct nullb_device *dev = cmd->nq->dev; |
| unsigned int zone_no = null_zone_no(dev, sector); |
| struct blk_zone *zone = &dev->zones[zone_no]; |
| size_t i; |
| |
| switch (op) { |
| case REQ_OP_ZONE_RESET_ALL: |
| for (i = 0; i < dev->nr_zones; i++) { |
| if (zone[i].type == BLK_ZONE_TYPE_CONVENTIONAL) |
| continue; |
| zone[i].cond = BLK_ZONE_COND_EMPTY; |
| zone[i].wp = zone[i].start; |
| } |
| break; |
| case REQ_OP_ZONE_RESET: |
| if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL) |
| return BLK_STS_IOERR; |
| |
| zone->cond = BLK_ZONE_COND_EMPTY; |
| zone->wp = zone->start; |
| break; |
| case REQ_OP_ZONE_OPEN: |
| if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL) |
| return BLK_STS_IOERR; |
| if (zone->cond == BLK_ZONE_COND_FULL) |
| return BLK_STS_IOERR; |
| |
| zone->cond = BLK_ZONE_COND_EXP_OPEN; |
| break; |
| case REQ_OP_ZONE_CLOSE: |
| if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL) |
| return BLK_STS_IOERR; |
| if (zone->cond == BLK_ZONE_COND_FULL) |
| return BLK_STS_IOERR; |
| |
| if (zone->wp == zone->start) |
| zone->cond = BLK_ZONE_COND_EMPTY; |
| else |
| zone->cond = BLK_ZONE_COND_CLOSED; |
| break; |
| case REQ_OP_ZONE_FINISH: |
| if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL) |
| return BLK_STS_IOERR; |
| |
| zone->cond = BLK_ZONE_COND_FULL; |
| zone->wp = zone->start + zone->len; |
| break; |
| default: |
| return BLK_STS_NOTSUPP; |
| } |
| |
| trace_nullb_zone_op(cmd, zone_no, zone->cond); |
| return BLK_STS_OK; |
| } |
| |
| blk_status_t null_process_zoned_cmd(struct nullb_cmd *cmd, enum req_opf op, |
| sector_t sector, sector_t nr_sectors) |
| { |
| switch (op) { |
| case REQ_OP_WRITE: |
| return null_zone_write(cmd, sector, nr_sectors, false); |
| case REQ_OP_ZONE_APPEND: |
| return null_zone_write(cmd, sector, nr_sectors, true); |
| case REQ_OP_ZONE_RESET: |
| case REQ_OP_ZONE_RESET_ALL: |
| case REQ_OP_ZONE_OPEN: |
| case REQ_OP_ZONE_CLOSE: |
| case REQ_OP_ZONE_FINISH: |
| return null_zone_mgmt(cmd, op, sector); |
| default: |
| return null_process_cmd(cmd, op, sector, nr_sectors); |
| } |
| } |