diff options
Diffstat (limited to 'block/blk-sysfs.c')
| -rw-r--r-- | block/blk-sysfs.c | 1076 |
1 files changed, 1076 insertions, 0 deletions
diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c new file mode 100644 index 000000000..520972676 --- /dev/null +++ b/block/blk-sysfs.c @@ -0,0 +1,1076 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Functions related to sysfs handling + */ +#include <linux/kernel.h> +#include <linux/slab.h> +#include <linux/module.h> +#include <linux/bio.h> +#include <linux/blkdev.h> +#include <linux/backing-dev.h> +#include <linux/blktrace_api.h> +#include <linux/debugfs.h> + +#include "blk.h" +#include "blk-mq.h" +#include "blk-mq-debugfs.h" +#include "blk-mq-sched.h" +#include "blk-rq-qos.h" +#include "blk-wbt.h" +#include "blk-cgroup.h" +#include "blk-throttle.h" +#include "error-injection.h" + +struct queue_sysfs_entry { + struct attribute attr; + ssize_t (*show)(struct gendisk *disk, char *page); + ssize_t (*show_limit)(struct gendisk *disk, char *page); + + ssize_t (*store)(struct gendisk *disk, const char *page, size_t count); + int (*store_limit)(struct gendisk *disk, const char *page, + size_t count, struct queue_limits *lim); +}; + +static ssize_t +queue_var_show(unsigned long var, char *page) +{ + return sysfs_emit(page, "%lu\n", var); +} + +static ssize_t +queue_var_store(unsigned long *var, const char *page, size_t count) +{ + int err; + unsigned long v; + + err = kstrtoul(page, 10, &v); + if (err || v > UINT_MAX) + return -EINVAL; + + *var = v; + + return count; +} + +static ssize_t queue_requests_show(struct gendisk *disk, char *page) +{ + ssize_t ret; + + mutex_lock(&disk->queue->elevator_lock); + ret = queue_var_show(disk->queue->nr_requests, page); + mutex_unlock(&disk->queue->elevator_lock); + return ret; +} + +static ssize_t +queue_requests_store(struct gendisk *disk, const char *page, size_t count) +{ + struct request_queue *q = disk->queue; + struct blk_mq_tag_set *set = q->tag_set; + struct elevator_tags *et = NULL; + unsigned int memflags; + unsigned long nr; + int ret; + + ret = queue_var_store(&nr, page, count); + if (ret < 0) + return ret; + + /* + * Serialize updating nr_requests with concurrent queue_requests_store() + * and switching elevator. + * + * Use trylock to avoid circular lock dependency with kernfs active + * reference during concurrent disk deletion: + * update_nr_hwq_lock -> kn->active (via del_gendisk -> kobject_del) + * kn->active -> update_nr_hwq_lock (via this sysfs write path) + */ + if (!down_write_trylock(&set->update_nr_hwq_lock)) + return -EBUSY; + + if (nr == q->nr_requests) + goto unlock; + + if (nr < BLKDEV_MIN_RQ) + nr = BLKDEV_MIN_RQ; + + /* + * Switching elevator is protected by update_nr_hwq_lock: + * - read lock is held from elevator sysfs attribute; + * - write lock is held from updating nr_hw_queues; + * Hence it's safe to access q->elevator here with write lock held. + */ + if (nr <= set->reserved_tags || + (q->elevator && nr > MAX_SCHED_RQ) || + (!q->elevator && nr > set->queue_depth)) { + ret = -EINVAL; + goto unlock; + } + + if (!blk_mq_is_shared_tags(set->flags) && q->elevator && + nr > q->elevator->et->nr_requests) { + /* + * Tags will grow, allocate memory before freezing queue to + * prevent deadlock. + */ + et = blk_mq_alloc_sched_tags(set, q->nr_hw_queues, nr); + if (!et) { + ret = -ENOMEM; + goto unlock; + } + } + + memflags = blk_mq_freeze_queue(q); + mutex_lock(&q->elevator_lock); + et = blk_mq_update_nr_requests(q, et, nr); + mutex_unlock(&q->elevator_lock); + blk_mq_unfreeze_queue(q, memflags); + + if (et) + blk_mq_free_sched_tags(et, set); + +unlock: + up_write(&set->update_nr_hwq_lock); + return ret; +} + +static ssize_t queue_async_depth_show(struct gendisk *disk, char *page) +{ + guard(mutex)(&disk->queue->elevator_lock); + + return queue_var_show(disk->queue->async_depth, page); +} + +static ssize_t +queue_async_depth_store(struct gendisk *disk, const char *page, size_t count) +{ + struct request_queue *q = disk->queue; + unsigned int memflags; + unsigned long nr; + int ret; + + if (!queue_is_mq(q)) + return -EINVAL; + + ret = queue_var_store(&nr, page, count); + if (ret < 0) + return ret; + + if (nr == 0) + return -EINVAL; + + memflags = blk_mq_freeze_queue(q); + scoped_guard(mutex, &q->elevator_lock) { + if (q->elevator) { + q->async_depth = min(q->nr_requests, nr); + if (q->elevator->type->ops.depth_updated) + q->elevator->type->ops.depth_updated(q); + } else { + ret = -EINVAL; + } + } + blk_mq_unfreeze_queue(q, memflags); + + return ret; +} + +static ssize_t queue_ra_show(struct gendisk *disk, char *page) +{ + ssize_t ret; + + mutex_lock(&disk->queue->limits_lock); + ret = queue_var_show(disk->bdi->ra_pages << (PAGE_SHIFT - 10), page); + mutex_unlock(&disk->queue->limits_lock); + + return ret; +} + +static ssize_t +queue_ra_store(struct gendisk *disk, const char *page, size_t count) +{ + unsigned long ra_kb; + ssize_t ret; + struct request_queue *q = disk->queue; + + ret = queue_var_store(&ra_kb, page, count); + if (ret < 0) + return ret; + /* + * The ->ra_pages change below is protected by ->limits_lock because it + * is usually calculated from the queue limits by + * queue_limits_commit_update(). + * + * bdi->ra_pages reads are not serialized against bdi->ra_pages writes. + * Use WRITE_ONCE() to write bdi->ra_pages once. + */ + mutex_lock(&q->limits_lock); + WRITE_ONCE(disk->bdi->ra_pages, ra_kb >> (PAGE_SHIFT - 10)); + mutex_unlock(&q->limits_lock); + + return ret; +} + +#define QUEUE_SYSFS_LIMIT_SHOW(_field) \ +static ssize_t queue_##_field##_show(struct gendisk *disk, char *page) \ +{ \ + return queue_var_show(disk->queue->limits._field, page); \ +} + +QUEUE_SYSFS_LIMIT_SHOW(max_segments) +QUEUE_SYSFS_LIMIT_SHOW(max_discard_segments) +QUEUE_SYSFS_LIMIT_SHOW(max_integrity_segments) +QUEUE_SYSFS_LIMIT_SHOW(max_segment_size) +QUEUE_SYSFS_LIMIT_SHOW(max_write_streams) +QUEUE_SYSFS_LIMIT_SHOW(write_stream_granularity) +QUEUE_SYSFS_LIMIT_SHOW(logical_block_size) +QUEUE_SYSFS_LIMIT_SHOW(physical_block_size) +QUEUE_SYSFS_LIMIT_SHOW(chunk_sectors) +QUEUE_SYSFS_LIMIT_SHOW(io_min) +QUEUE_SYSFS_LIMIT_SHOW(io_opt) +QUEUE_SYSFS_LIMIT_SHOW(discard_granularity) +QUEUE_SYSFS_LIMIT_SHOW(zone_write_granularity) +QUEUE_SYSFS_LIMIT_SHOW(virt_boundary_mask) +QUEUE_SYSFS_LIMIT_SHOW(dma_alignment) +QUEUE_SYSFS_LIMIT_SHOW(max_open_zones) +QUEUE_SYSFS_LIMIT_SHOW(max_active_zones) +QUEUE_SYSFS_LIMIT_SHOW(atomic_write_unit_min) +QUEUE_SYSFS_LIMIT_SHOW(atomic_write_unit_max) + +#define QUEUE_SYSFS_LIMIT_SHOW_SECTORS_TO_BYTES(_field) \ +static ssize_t queue_##_field##_show(struct gendisk *disk, char *page) \ +{ \ + return sysfs_emit(page, "%llu\n", \ + (unsigned long long)disk->queue->limits._field << \ + SECTOR_SHIFT); \ +} + +QUEUE_SYSFS_LIMIT_SHOW_SECTORS_TO_BYTES(max_discard_sectors) +QUEUE_SYSFS_LIMIT_SHOW_SECTORS_TO_BYTES(max_hw_discard_sectors) +QUEUE_SYSFS_LIMIT_SHOW_SECTORS_TO_BYTES(max_write_zeroes_sectors) +QUEUE_SYSFS_LIMIT_SHOW_SECTORS_TO_BYTES(max_hw_wzeroes_unmap_sectors) +QUEUE_SYSFS_LIMIT_SHOW_SECTORS_TO_BYTES(max_wzeroes_unmap_sectors) +QUEUE_SYSFS_LIMIT_SHOW_SECTORS_TO_BYTES(atomic_write_max_sectors) +QUEUE_SYSFS_LIMIT_SHOW_SECTORS_TO_BYTES(atomic_write_boundary_sectors) +QUEUE_SYSFS_LIMIT_SHOW_SECTORS_TO_BYTES(max_zone_append_sectors) + +#define QUEUE_SYSFS_LIMIT_SHOW_SECTORS_TO_KB(_field) \ +static ssize_t queue_##_field##_show(struct gendisk *disk, char *page) \ +{ \ + return queue_var_show(disk->queue->limits._field >> 1, page); \ +} + +QUEUE_SYSFS_LIMIT_SHOW_SECTORS_TO_KB(max_sectors) +QUEUE_SYSFS_LIMIT_SHOW_SECTORS_TO_KB(max_hw_sectors) + +#define QUEUE_SYSFS_SHOW_CONST(_name, _val) \ +static ssize_t queue_##_name##_show(struct gendisk *disk, char *page) \ +{ \ + return sysfs_emit(page, "%d\n", _val); \ +} + +/* deprecated fields */ +QUEUE_SYSFS_SHOW_CONST(discard_zeroes_data, 0) +QUEUE_SYSFS_SHOW_CONST(write_same_max, 0) +QUEUE_SYSFS_SHOW_CONST(poll_delay, -1) + +static int queue_max_discard_sectors_store(struct gendisk *disk, + const char *page, size_t count, struct queue_limits *lim) +{ + unsigned long max_discard_bytes; + ssize_t ret; + + ret = queue_var_store(&max_discard_bytes, page, count); + if (ret < 0) + return ret; + + if (max_discard_bytes & (disk->queue->limits.discard_granularity - 1)) + return -EINVAL; + + if ((max_discard_bytes >> SECTOR_SHIFT) > UINT_MAX) + return -EINVAL; + + lim->max_user_discard_sectors = max_discard_bytes >> SECTOR_SHIFT; + return 0; +} + +static int queue_max_wzeroes_unmap_sectors_store(struct gendisk *disk, + const char *page, size_t count, struct queue_limits *lim) +{ + unsigned long max_zeroes_bytes, max_hw_zeroes_bytes; + ssize_t ret; + + ret = queue_var_store(&max_zeroes_bytes, page, count); + if (ret < 0) + return ret; + + max_hw_zeroes_bytes = lim->max_hw_wzeroes_unmap_sectors << SECTOR_SHIFT; + if (max_zeroes_bytes != 0 && max_zeroes_bytes != max_hw_zeroes_bytes) + return -EINVAL; + + lim->max_user_wzeroes_unmap_sectors = max_zeroes_bytes >> SECTOR_SHIFT; + return 0; +} + +static int +queue_max_sectors_store(struct gendisk *disk, const char *page, size_t count, + struct queue_limits *lim) +{ + unsigned long max_sectors_kb; + ssize_t ret; + + ret = queue_var_store(&max_sectors_kb, page, count); + if (ret < 0) + return ret; + + lim->max_user_sectors = max_sectors_kb << 1; + return 0; +} + +static ssize_t queue_feature_store(struct gendisk *disk, const char *page, + size_t count, struct queue_limits *lim, blk_features_t feature) +{ + unsigned long val; + ssize_t ret; + + ret = queue_var_store(&val, page, count); + if (ret < 0) + return ret; + + if (val) + lim->features |= feature; + else + lim->features &= ~feature; + return 0; +} + +#define QUEUE_SYSFS_FEATURE(_name, _feature) \ +static ssize_t queue_##_name##_show(struct gendisk *disk, char *page) \ +{ \ + return sysfs_emit(page, "%u\n", \ + !!(disk->queue->limits.features & _feature)); \ +} \ +static int queue_##_name##_store(struct gendisk *disk, \ + const char *page, size_t count, struct queue_limits *lim) \ +{ \ + return queue_feature_store(disk, page, count, lim, _feature); \ +} + +QUEUE_SYSFS_FEATURE(rotational, BLK_FEAT_ROTATIONAL) +QUEUE_SYSFS_FEATURE(add_random, BLK_FEAT_ADD_RANDOM) +QUEUE_SYSFS_FEATURE(iostats, BLK_FEAT_IO_STAT) +QUEUE_SYSFS_FEATURE(stable_writes, BLK_FEAT_STABLE_WRITES); + +#define QUEUE_SYSFS_FEATURE_SHOW(_name, _feature) \ +static ssize_t queue_##_name##_show(struct gendisk *disk, char *page) \ +{ \ + return sysfs_emit(page, "%u\n", \ + !!(disk->queue->limits.features & _feature)); \ +} + +QUEUE_SYSFS_FEATURE_SHOW(fua, BLK_FEAT_FUA); +QUEUE_SYSFS_FEATURE_SHOW(dax, BLK_FEAT_DAX); + +static ssize_t queue_poll_show(struct gendisk *disk, char *page) +{ + if (queue_is_mq(disk->queue)) + return sysfs_emit(page, "%u\n", blk_mq_can_poll(disk->queue)); + + return sysfs_emit(page, "%u\n", + !!(disk->queue->limits.features & BLK_FEAT_POLL)); +} + +static ssize_t queue_zoned_show(struct gendisk *disk, char *page) +{ + if (blk_queue_is_zoned(disk->queue)) + return sysfs_emit(page, "host-managed\n"); + return sysfs_emit(page, "none\n"); +} + +static ssize_t queue_nr_zones_show(struct gendisk *disk, char *page) +{ + return queue_var_show(disk_nr_zones(disk), page); +} + +static ssize_t queue_zoned_qd1_writes_show(struct gendisk *disk, char *page) +{ + return queue_var_show(!!blk_queue_zoned_qd1_writes(disk->queue), + page); +} + +static ssize_t queue_zoned_qd1_writes_store(struct gendisk *disk, + const char *page, size_t count) +{ + struct request_queue *q = disk->queue; + unsigned long qd1_writes; + unsigned int memflags; + ssize_t ret; + + ret = queue_var_store(&qd1_writes, page, count); + if (ret < 0) + return ret; + + memflags = blk_mq_freeze_queue(q); + blk_mq_quiesce_queue(q); + if (qd1_writes) + blk_queue_flag_set(QUEUE_FLAG_ZONED_QD1_WRITES, q); + else + blk_queue_flag_clear(QUEUE_FLAG_ZONED_QD1_WRITES, q); + blk_mq_unquiesce_queue(q); + blk_mq_unfreeze_queue(q, memflags); + + return count; +} + +static ssize_t queue_iostats_passthrough_show(struct gendisk *disk, char *page) +{ + return queue_var_show(!!blk_queue_passthrough_stat(disk->queue), page); +} + +static int queue_iostats_passthrough_store(struct gendisk *disk, + const char *page, size_t count, struct queue_limits *lim) +{ + unsigned long ios; + ssize_t ret; + + ret = queue_var_store(&ios, page, count); + if (ret < 0) + return ret; + + if (ios) + lim->flags |= BLK_FLAG_IOSTATS_PASSTHROUGH; + else + lim->flags &= ~BLK_FLAG_IOSTATS_PASSTHROUGH; + return 0; +} + +static ssize_t queue_nomerges_show(struct gendisk *disk, char *page) +{ + return queue_var_show((blk_queue_nomerges(disk->queue) << 1) | + blk_queue_noxmerges(disk->queue), page); +} + +static ssize_t queue_nomerges_store(struct gendisk *disk, const char *page, + size_t count) +{ + unsigned long nm; + struct request_queue *q = disk->queue; + ssize_t ret = queue_var_store(&nm, page, count); + + if (ret < 0) + return ret; + + blk_queue_flag_clear(QUEUE_FLAG_NOMERGES, q); + blk_queue_flag_clear(QUEUE_FLAG_NOXMERGES, q); + if (nm == 2) + blk_queue_flag_set(QUEUE_FLAG_NOMERGES, q); + else if (nm) + blk_queue_flag_set(QUEUE_FLAG_NOXMERGES, q); + + return ret; +} + +static ssize_t queue_rq_affinity_show(struct gendisk *disk, char *page) +{ + bool set = test_bit(QUEUE_FLAG_SAME_COMP, &disk->queue->queue_flags); + bool force = test_bit(QUEUE_FLAG_SAME_FORCE, &disk->queue->queue_flags); + + return queue_var_show(set << force, page); +} + +static ssize_t +queue_rq_affinity_store(struct gendisk *disk, const char *page, size_t count) +{ + ssize_t ret = -EINVAL; +#ifdef CONFIG_SMP + struct request_queue *q = disk->queue; + unsigned long val; + + ret = queue_var_store(&val, page, count); + if (ret < 0) + return ret; + + /* + * Here we update two queue flags each using atomic bitops, although + * updating two flags isn't atomic it should be harmless as those flags + * are accessed individually using atomic test_bit operation. So we + * don't grab any lock while updating these flags. + */ + if (val == 2) { + blk_queue_flag_set(QUEUE_FLAG_SAME_COMP, q); + blk_queue_flag_set(QUEUE_FLAG_SAME_FORCE, q); + } else if (val == 1) { + blk_queue_flag_set(QUEUE_FLAG_SAME_COMP, q); + blk_queue_flag_clear(QUEUE_FLAG_SAME_FORCE, q); + } else if (val == 0) { + blk_queue_flag_clear(QUEUE_FLAG_SAME_COMP, q); + blk_queue_flag_clear(QUEUE_FLAG_SAME_FORCE, q); + } +#endif + return ret; +} + +static ssize_t queue_poll_delay_store(struct gendisk *disk, const char *page, + size_t count) +{ + return count; +} + +static ssize_t queue_poll_store(struct gendisk *disk, const char *page, + size_t count) +{ + ssize_t ret = count; + struct request_queue *q = disk->queue; + + if (!(q->limits.features & BLK_FEAT_POLL)) { + ret = -EINVAL; + goto out; + } + + pr_info_ratelimited("writes to the poll attribute are ignored.\n"); + pr_info_ratelimited("please use driver specific parameters instead.\n"); +out: + return ret; +} + +static ssize_t queue_io_timeout_show(struct gendisk *disk, char *page) +{ + return sysfs_emit(page, "%u\n", + jiffies_to_msecs(READ_ONCE(disk->queue->rq_timeout))); +} + +static ssize_t queue_io_timeout_store(struct gendisk *disk, const char *page, + size_t count) +{ + unsigned int val; + int err; + struct request_queue *q = disk->queue; + + err = kstrtou32(page, 10, &val); + if (err || val == 0) + return -EINVAL; + + blk_queue_rq_timeout(q, msecs_to_jiffies(val)); + + return count; +} + +static ssize_t queue_wc_show(struct gendisk *disk, char *page) +{ + if (blk_queue_write_cache(disk->queue)) + return sysfs_emit(page, "write back\n"); + return sysfs_emit(page, "write through\n"); +} + +static int queue_wc_store(struct gendisk *disk, const char *page, + size_t count, struct queue_limits *lim) +{ + bool disable; + + if (!strncmp(page, "write back", 10)) { + disable = false; + } else if (!strncmp(page, "write through", 13) || + !strncmp(page, "none", 4)) { + disable = true; + } else { + return -EINVAL; + } + + if (disable) + lim->flags |= BLK_FLAG_WRITE_CACHE_DISABLED; + else + lim->flags &= ~BLK_FLAG_WRITE_CACHE_DISABLED; + return 0; +} + +#define QUEUE_RO_ENTRY(_prefix, _name) \ +static const struct queue_sysfs_entry _prefix##_entry = { \ + .attr = { .name = _name, .mode = 0444 }, \ + .show = _prefix##_show, \ +}; + +#define QUEUE_RW_ENTRY(_prefix, _name) \ +static const struct queue_sysfs_entry _prefix##_entry = { \ + .attr = { .name = _name, .mode = 0644 }, \ + .show = _prefix##_show, \ + .store = _prefix##_store, \ +}; + +#define QUEUE_LIM_RO_ENTRY(_prefix, _name) \ +static const struct queue_sysfs_entry _prefix##_entry = { \ + .attr = { .name = _name, .mode = 0444 }, \ + .show_limit = _prefix##_show, \ +} + +#define QUEUE_LIM_RW_ENTRY(_prefix, _name) \ +static const struct queue_sysfs_entry _prefix##_entry = { \ + .attr = { .name = _name, .mode = 0644 }, \ + .show_limit = _prefix##_show, \ + .store_limit = _prefix##_store, \ +} + +QUEUE_RW_ENTRY(queue_requests, "nr_requests"); +QUEUE_RW_ENTRY(queue_async_depth, "async_depth"); +QUEUE_RW_ENTRY(queue_ra, "read_ahead_kb"); +QUEUE_LIM_RW_ENTRY(queue_max_sectors, "max_sectors_kb"); +QUEUE_LIM_RO_ENTRY(queue_max_hw_sectors, "max_hw_sectors_kb"); +QUEUE_LIM_RO_ENTRY(queue_max_segments, "max_segments"); +QUEUE_LIM_RO_ENTRY(queue_max_integrity_segments, "max_integrity_segments"); +QUEUE_LIM_RO_ENTRY(queue_max_segment_size, "max_segment_size"); +QUEUE_LIM_RO_ENTRY(queue_max_write_streams, "max_write_streams"); +QUEUE_LIM_RO_ENTRY(queue_write_stream_granularity, "write_stream_granularity"); +QUEUE_RW_ENTRY(elv_iosched, "scheduler"); + +QUEUE_LIM_RO_ENTRY(queue_logical_block_size, "logical_block_size"); +QUEUE_LIM_RO_ENTRY(queue_physical_block_size, "physical_block_size"); +QUEUE_LIM_RO_ENTRY(queue_chunk_sectors, "chunk_sectors"); +QUEUE_LIM_RO_ENTRY(queue_io_min, "minimum_io_size"); +QUEUE_LIM_RO_ENTRY(queue_io_opt, "optimal_io_size"); + +QUEUE_LIM_RO_ENTRY(queue_max_discard_segments, "max_discard_segments"); +QUEUE_LIM_RO_ENTRY(queue_discard_granularity, "discard_granularity"); +QUEUE_LIM_RO_ENTRY(queue_max_hw_discard_sectors, "discard_max_hw_bytes"); +QUEUE_LIM_RW_ENTRY(queue_max_discard_sectors, "discard_max_bytes"); +QUEUE_RO_ENTRY(queue_discard_zeroes_data, "discard_zeroes_data"); + +QUEUE_LIM_RO_ENTRY(queue_atomic_write_max_sectors, "atomic_write_max_bytes"); +QUEUE_LIM_RO_ENTRY(queue_atomic_write_boundary_sectors, + "atomic_write_boundary_bytes"); +QUEUE_LIM_RO_ENTRY(queue_atomic_write_unit_max, "atomic_write_unit_max_bytes"); +QUEUE_LIM_RO_ENTRY(queue_atomic_write_unit_min, "atomic_write_unit_min_bytes"); + +QUEUE_RO_ENTRY(queue_write_same_max, "write_same_max_bytes"); +QUEUE_LIM_RO_ENTRY(queue_max_write_zeroes_sectors, "write_zeroes_max_bytes"); +QUEUE_LIM_RO_ENTRY(queue_max_hw_wzeroes_unmap_sectors, + "write_zeroes_unmap_max_hw_bytes"); +QUEUE_LIM_RW_ENTRY(queue_max_wzeroes_unmap_sectors, + "write_zeroes_unmap_max_bytes"); +QUEUE_LIM_RO_ENTRY(queue_max_zone_append_sectors, "zone_append_max_bytes"); +QUEUE_LIM_RO_ENTRY(queue_zone_write_granularity, "zone_write_granularity"); + +QUEUE_LIM_RO_ENTRY(queue_zoned, "zoned"); +QUEUE_RW_ENTRY(queue_zoned_qd1_writes, "zoned_qd1_writes"); +QUEUE_RO_ENTRY(queue_nr_zones, "nr_zones"); +QUEUE_LIM_RO_ENTRY(queue_max_open_zones, "max_open_zones"); +QUEUE_LIM_RO_ENTRY(queue_max_active_zones, "max_active_zones"); + +QUEUE_RW_ENTRY(queue_nomerges, "nomerges"); +QUEUE_LIM_RW_ENTRY(queue_iostats_passthrough, "iostats_passthrough"); +QUEUE_RW_ENTRY(queue_rq_affinity, "rq_affinity"); +QUEUE_RW_ENTRY(queue_poll, "io_poll"); +QUEUE_RW_ENTRY(queue_poll_delay, "io_poll_delay"); +QUEUE_LIM_RW_ENTRY(queue_wc, "write_cache"); +QUEUE_LIM_RO_ENTRY(queue_fua, "fua"); +QUEUE_LIM_RO_ENTRY(queue_dax, "dax"); +QUEUE_RW_ENTRY(queue_io_timeout, "io_timeout"); +QUEUE_LIM_RO_ENTRY(queue_virt_boundary_mask, "virt_boundary_mask"); +QUEUE_LIM_RO_ENTRY(queue_dma_alignment, "dma_alignment"); + +/* legacy alias for logical_block_size: */ +static const struct queue_sysfs_entry queue_hw_sector_size_entry = { + .attr = {.name = "hw_sector_size", .mode = 0444 }, + .show_limit = queue_logical_block_size_show, +}; + +QUEUE_LIM_RW_ENTRY(queue_rotational, "rotational"); +QUEUE_LIM_RW_ENTRY(queue_iostats, "iostats"); +QUEUE_LIM_RW_ENTRY(queue_add_random, "add_random"); +QUEUE_LIM_RW_ENTRY(queue_stable_writes, "stable_writes"); + +#ifdef CONFIG_BLK_WBT +static ssize_t queue_var_store64(s64 *var, const char *page) +{ + int err; + s64 v; + + err = kstrtos64(page, 10, &v); + if (err < 0) + return err; + + *var = v; + return 0; +} + +static ssize_t queue_wb_lat_show(struct gendisk *disk, char *page) +{ + ssize_t ret; + struct request_queue *q = disk->queue; + + mutex_lock(&disk->rqos_state_mutex); + if (!wbt_rq_qos(q)) { + ret = -EINVAL; + goto out; + } + + if (wbt_disabled(q)) { + ret = sysfs_emit(page, "0\n"); + goto out; + } + + ret = sysfs_emit(page, "%llu\n", div_u64(wbt_get_min_lat(q), 1000)); +out: + mutex_unlock(&disk->rqos_state_mutex); + return ret; +} + +static ssize_t queue_wb_lat_store(struct gendisk *disk, const char *page, + size_t count) +{ + ssize_t ret; + s64 val; + + ret = queue_var_store64(&val, page); + if (ret < 0) + return ret; + if (val < -1) + return -EINVAL; + + ret = wbt_set_lat(disk, val); + return ret ? ret : count; +} + +QUEUE_RW_ENTRY(queue_wb_lat, "wbt_lat_usec"); +#endif + +/* Common attributes for bio-based and request-based queues. */ +static const struct attribute *const queue_attrs[] = { + /* + * Attributes which are protected with q->limits_lock. + */ + &queue_max_hw_sectors_entry.attr, + &queue_max_sectors_entry.attr, + &queue_max_segments_entry.attr, + &queue_max_discard_segments_entry.attr, + &queue_max_integrity_segments_entry.attr, + &queue_max_segment_size_entry.attr, + &queue_max_write_streams_entry.attr, + &queue_write_stream_granularity_entry.attr, + &queue_hw_sector_size_entry.attr, + &queue_logical_block_size_entry.attr, + &queue_physical_block_size_entry.attr, + &queue_chunk_sectors_entry.attr, + &queue_io_min_entry.attr, + &queue_io_opt_entry.attr, + &queue_discard_granularity_entry.attr, + &queue_max_discard_sectors_entry.attr, + &queue_max_hw_discard_sectors_entry.attr, + &queue_atomic_write_max_sectors_entry.attr, + &queue_atomic_write_boundary_sectors_entry.attr, + &queue_atomic_write_unit_min_entry.attr, + &queue_atomic_write_unit_max_entry.attr, + &queue_max_write_zeroes_sectors_entry.attr, + &queue_max_hw_wzeroes_unmap_sectors_entry.attr, + &queue_max_wzeroes_unmap_sectors_entry.attr, + &queue_max_zone_append_sectors_entry.attr, + &queue_zone_write_granularity_entry.attr, + &queue_rotational_entry.attr, + &queue_zoned_entry.attr, + &queue_max_open_zones_entry.attr, + &queue_max_active_zones_entry.attr, + &queue_iostats_passthrough_entry.attr, + &queue_iostats_entry.attr, + &queue_stable_writes_entry.attr, + &queue_add_random_entry.attr, + &queue_wc_entry.attr, + &queue_fua_entry.attr, + &queue_dax_entry.attr, + &queue_virt_boundary_mask_entry.attr, + &queue_dma_alignment_entry.attr, + &queue_ra_entry.attr, + + /* + * Attributes which don't require locking. + */ + &queue_discard_zeroes_data_entry.attr, + &queue_write_same_max_entry.attr, + &queue_nr_zones_entry.attr, + &queue_nomerges_entry.attr, + &queue_poll_entry.attr, + &queue_poll_delay_entry.attr, + &queue_zoned_qd1_writes_entry.attr, + + NULL, +}; + +/* Request-based queue attributes that are not relevant for bio-based queues. */ +static const struct attribute *const blk_mq_queue_attrs[] = { + /* + * Attributes which require some form of locking other than + * q->sysfs_lock. + */ + &elv_iosched_entry.attr, + &queue_requests_entry.attr, + &queue_async_depth_entry.attr, +#ifdef CONFIG_BLK_WBT + &queue_wb_lat_entry.attr, +#endif + /* + * Attributes which don't require locking. + */ + &queue_rq_affinity_entry.attr, + &queue_io_timeout_entry.attr, + + NULL, +}; + +static umode_t queue_attr_visible(struct kobject *kobj, const struct attribute *attr, + int n) +{ + struct gendisk *disk = container_of(kobj, struct gendisk, queue_kobj); + struct request_queue *q = disk->queue; + + if ((attr == &queue_max_open_zones_entry.attr || + attr == &queue_max_active_zones_entry.attr || + attr == &queue_zoned_qd1_writes_entry.attr) && + !blk_queue_is_zoned(q)) + return 0; + + return attr->mode; +} + +static umode_t blk_mq_queue_attr_visible(struct kobject *kobj, + const struct attribute *attr, int n) +{ + struct gendisk *disk = container_of(kobj, struct gendisk, queue_kobj); + struct request_queue *q = disk->queue; + + if (!queue_is_mq(q)) + return 0; + + if (attr == &queue_io_timeout_entry.attr && !q->mq_ops->timeout) + return 0; + + return attr->mode; +} + +static const struct attribute_group queue_attr_group = { + .attrs_const = queue_attrs, + .is_visible_const = queue_attr_visible, +}; + +static const struct attribute_group blk_mq_queue_attr_group = { + .attrs_const = blk_mq_queue_attrs, + .is_visible_const = blk_mq_queue_attr_visible, +}; + +#define to_queue(atr) container_of_const((atr), struct queue_sysfs_entry, attr) + +static ssize_t +queue_attr_show(struct kobject *kobj, struct attribute *attr, char *page) +{ + struct queue_sysfs_entry *entry = to_queue(attr); + struct gendisk *disk = container_of(kobj, struct gendisk, queue_kobj); + + if (!entry->show && !entry->show_limit) + return -EIO; + + if (entry->show_limit) { + ssize_t res; + + mutex_lock(&disk->queue->limits_lock); + res = entry->show_limit(disk, page); + mutex_unlock(&disk->queue->limits_lock); + return res; + } + + return entry->show(disk, page); +} + +static ssize_t +queue_attr_store(struct kobject *kobj, struct attribute *attr, + const char *page, size_t length) +{ + struct queue_sysfs_entry *entry = to_queue(attr); + struct gendisk *disk = container_of(kobj, struct gendisk, queue_kobj); + struct request_queue *q = disk->queue; + + if (!entry->store_limit && !entry->store) + return -EIO; + + if (entry->store_limit) { + ssize_t res; + + struct queue_limits lim = queue_limits_start_update(q); + + res = entry->store_limit(disk, page, length, &lim); + if (res < 0) { + queue_limits_cancel_update(q); + return res; + } + + res = queue_limits_commit_update_frozen(q, &lim); + if (res) + return res; + return length; + } + + return entry->store(disk, page, length); +} + +static const struct sysfs_ops queue_sysfs_ops = { + .show = queue_attr_show, + .store = queue_attr_store, +}; + +static const struct attribute_group *blk_queue_attr_groups[] = { + &queue_attr_group, + &blk_mq_queue_attr_group, + NULL +}; + +static void blk_queue_release(struct kobject *kobj) +{ + /* nothing to do here, all data is associated with the parent gendisk */ +} + +const struct kobj_type blk_queue_ktype = { + .default_groups = blk_queue_attr_groups, + .sysfs_ops = &queue_sysfs_ops, + .release = blk_queue_release, +}; + +static void blk_debugfs_remove(struct gendisk *disk) +{ + struct request_queue *q = disk->queue; + + blk_debugfs_lock_nomemsave(q); + blk_trace_shutdown(q); + if (IS_ENABLED(CONFIG_BLK_ERROR_INJECTION)) + blk_error_injection_exit(disk); + debugfs_remove_recursive(q->debugfs_dir); + q->debugfs_dir = NULL; + q->sched_debugfs_dir = NULL; + q->rqos_debugfs_dir = NULL; + blk_debugfs_unlock_nomemrestore(q); +} + +/** + * blk_register_queue - register a block layer queue with sysfs + * @disk: Disk of which the request queue should be registered with sysfs. + */ +int blk_register_queue(struct gendisk *disk) +{ + struct request_queue *q = disk->queue; + unsigned int memflags; + int ret; + + ret = kobject_add(&disk->queue_kobj, &disk_to_dev(disk)->kobj, "queue"); + if (ret < 0) + return ret; + + if (queue_is_mq(q)) { + ret = blk_mq_sysfs_register(disk); + if (ret) + goto out_del_queue_kobj; + } + mutex_lock(&q->sysfs_lock); + + memflags = blk_debugfs_lock(q); + q->debugfs_dir = debugfs_create_dir(disk->disk_name, blk_debugfs_root); + if (IS_ENABLED(CONFIG_BLK_ERROR_INJECTION)) + blk_error_injection_init(disk); + if (queue_is_mq(q)) + blk_mq_debugfs_register(q); + blk_debugfs_unlock(q, memflags); + + /* + * For blk-mq rotational zoned devices, default to using QD=1 + * writes. For non-mq rotational zoned devices, the device driver can + * set an appropriate default. + */ + if (queue_is_mq(q) && blk_queue_rot(q) && blk_queue_is_zoned(q)) + blk_queue_flag_set(QUEUE_FLAG_ZONED_QD1_WRITES, q); + + ret = disk_register_independent_access_ranges(disk); + if (ret) + goto out_debugfs_remove; + + ret = blk_crypto_sysfs_register(disk); + if (ret) + goto out_unregister_ia_ranges; + + if (queue_is_mq(q)) + elevator_set_default(q); + + blk_queue_flag_set(QUEUE_FLAG_REGISTERED, q); + wbt_init_enable_default(disk); + + /* Now everything is ready and send out KOBJ_ADD uevent */ + kobject_uevent(&disk->queue_kobj, KOBJ_ADD); + if (q->elevator) + kobject_uevent(&q->elevator->kobj, KOBJ_ADD); + mutex_unlock(&q->sysfs_lock); + + /* + * SCSI probing may synchronously create and destroy a lot of + * request_queues for non-existent devices. Shutting down a fully + * functional queue takes measureable wallclock time as RCU grace + * periods are involved. To avoid excessive latency in these + * cases, a request_queue starts out in a degraded mode which is + * faster to shut down and is made fully functional here as + * request_queues for non-existent devices never get registered. + */ + blk_queue_flag_set(QUEUE_FLAG_INIT_DONE, q); + percpu_ref_switch_to_percpu(&q->q_usage_counter); + + return ret; + +out_unregister_ia_ranges: + disk_unregister_independent_access_ranges(disk); +out_debugfs_remove: + blk_debugfs_remove(disk); + mutex_unlock(&q->sysfs_lock); + if (queue_is_mq(q)) + blk_mq_sysfs_unregister(disk); +out_del_queue_kobj: + kobject_del(&disk->queue_kobj); + return ret; +} + +/** + * blk_unregister_queue - counterpart of blk_register_queue() + * @disk: Disk of which the request queue should be unregistered from sysfs. + * + * Note: the caller is responsible for guaranteeing that this function is called + * after blk_register_queue() has finished. + */ +void blk_unregister_queue(struct gendisk *disk) +{ + struct request_queue *q = disk->queue; + + if (WARN_ON(!q)) + return; + + /* Return early if disk->queue was never registered. */ + if (!blk_queue_registered(q)) + return; + + /* + * Since sysfs_remove_dir() prevents adding new directory entries + * before removal of existing entries starts, protect against + * concurrent elv_iosched_store() calls. + */ + mutex_lock(&q->sysfs_lock); + blk_queue_flag_clear(QUEUE_FLAG_REGISTERED, q); + mutex_unlock(&q->sysfs_lock); + + /* + * Remove the sysfs attributes before unregistering the queue data + * structures that can be modified through sysfs. + */ + if (queue_is_mq(q)) + blk_mq_sysfs_unregister(disk); + blk_crypto_sysfs_unregister(disk); + + mutex_lock(&q->sysfs_lock); + disk_unregister_independent_access_ranges(disk); + mutex_unlock(&q->sysfs_lock); + + /* Now that we've deleted all child objects, we can delete the queue. */ + kobject_uevent(&disk->queue_kobj, KOBJ_REMOVE); + kobject_del(&disk->queue_kobj); + + if (queue_is_mq(q)) + elevator_set_none(q); + + blk_debugfs_remove(disk); +} |