1 // SPDX-License-Identifier: GPL-2.0
3 * Functions related to sysfs handling
5 #include <linux/kernel.h>
6 #include <linux/slab.h>
7 #include <linux/module.h>
9 #include <linux/blkdev.h>
10 #include <linux/backing-dev.h>
11 #include <linux/blktrace_api.h>
12 #include <linux/blk-mq.h>
13 #include <linux/blk-cgroup.h>
14 #include <linux/debugfs.h>
18 #include "blk-mq-debugfs.h"
19 #include "blk-mq-sched.h"
21 #include "blk-throttle.h"
23 struct queue_sysfs_entry {
24 struct attribute attr;
25 ssize_t (*show)(struct request_queue *, char *);
26 ssize_t (*store)(struct request_queue *, const char *, size_t);
30 queue_var_show(unsigned long var, char *page)
32 return sprintf(page, "%lu\n", var);
36 queue_var_store(unsigned long *var, const char *page, size_t count)
41 err = kstrtoul(page, 10, &v);
42 if (err || v > UINT_MAX)
50 static ssize_t queue_var_store64(s64 *var, const char *page)
55 err = kstrtos64(page, 10, &v);
63 static ssize_t queue_requests_show(struct request_queue *q, char *page)
65 return queue_var_show(q->nr_requests, page);
69 queue_requests_store(struct request_queue *q, const char *page, size_t count)
77 ret = queue_var_store(&nr, page, count);
81 if (nr < BLKDEV_MIN_RQ)
84 err = blk_mq_update_nr_requests(q, nr);
91 static ssize_t queue_ra_show(struct request_queue *q, char *page)
97 ra_kb = q->disk->bdi->ra_pages << (PAGE_SHIFT - 10);
98 return queue_var_show(ra_kb, page);
102 queue_ra_store(struct request_queue *q, const char *page, size_t count)
109 ret = queue_var_store(&ra_kb, page, count);
112 q->disk->bdi->ra_pages = ra_kb >> (PAGE_SHIFT - 10);
116 static ssize_t queue_max_sectors_show(struct request_queue *q, char *page)
118 int max_sectors_kb = queue_max_sectors(q) >> 1;
120 return queue_var_show(max_sectors_kb, page);
123 static ssize_t queue_max_segments_show(struct request_queue *q, char *page)
125 return queue_var_show(queue_max_segments(q), page);
128 static ssize_t queue_max_discard_segments_show(struct request_queue *q,
131 return queue_var_show(queue_max_discard_segments(q), page);
134 static ssize_t queue_max_integrity_segments_show(struct request_queue *q, char *page)
136 return queue_var_show(q->limits.max_integrity_segments, page);
139 static ssize_t queue_max_segment_size_show(struct request_queue *q, char *page)
141 return queue_var_show(queue_max_segment_size(q), page);
144 static ssize_t queue_logical_block_size_show(struct request_queue *q, char *page)
146 return queue_var_show(queue_logical_block_size(q), page);
149 static ssize_t queue_physical_block_size_show(struct request_queue *q, char *page)
151 return queue_var_show(queue_physical_block_size(q), page);
154 static ssize_t queue_chunk_sectors_show(struct request_queue *q, char *page)
156 return queue_var_show(q->limits.chunk_sectors, page);
159 static ssize_t queue_io_min_show(struct request_queue *q, char *page)
161 return queue_var_show(queue_io_min(q), page);
164 static ssize_t queue_io_opt_show(struct request_queue *q, char *page)
166 return queue_var_show(queue_io_opt(q), page);
169 static ssize_t queue_discard_granularity_show(struct request_queue *q, char *page)
171 return queue_var_show(q->limits.discard_granularity, page);
174 static ssize_t queue_discard_max_hw_show(struct request_queue *q, char *page)
177 return sprintf(page, "%llu\n",
178 (unsigned long long)q->limits.max_hw_discard_sectors << 9);
181 static ssize_t queue_discard_max_show(struct request_queue *q, char *page)
183 return sprintf(page, "%llu\n",
184 (unsigned long long)q->limits.max_discard_sectors << 9);
187 static ssize_t queue_discard_max_store(struct request_queue *q,
188 const char *page, size_t count)
190 unsigned long max_discard;
191 ssize_t ret = queue_var_store(&max_discard, page, count);
196 if (max_discard & (q->limits.discard_granularity - 1))
200 if (max_discard > UINT_MAX)
203 if (max_discard > q->limits.max_hw_discard_sectors)
204 max_discard = q->limits.max_hw_discard_sectors;
206 q->limits.max_discard_sectors = max_discard;
210 static ssize_t queue_discard_zeroes_data_show(struct request_queue *q, char *page)
212 return queue_var_show(0, page);
215 static ssize_t queue_write_same_max_show(struct request_queue *q, char *page)
217 return sprintf(page, "%llu\n",
218 (unsigned long long)q->limits.max_write_same_sectors << 9);
221 static ssize_t queue_write_zeroes_max_show(struct request_queue *q, char *page)
223 return sprintf(page, "%llu\n",
224 (unsigned long long)q->limits.max_write_zeroes_sectors << 9);
227 static ssize_t queue_zone_write_granularity_show(struct request_queue *q,
230 return queue_var_show(queue_zone_write_granularity(q), page);
233 static ssize_t queue_zone_append_max_show(struct request_queue *q, char *page)
235 unsigned long long max_sectors = q->limits.max_zone_append_sectors;
237 return sprintf(page, "%llu\n", max_sectors << SECTOR_SHIFT);
241 queue_max_sectors_store(struct request_queue *q, const char *page, size_t count)
243 unsigned long max_sectors_kb,
244 max_hw_sectors_kb = queue_max_hw_sectors(q) >> 1,
245 page_kb = 1 << (PAGE_SHIFT - 10);
246 ssize_t ret = queue_var_store(&max_sectors_kb, page, count);
251 max_hw_sectors_kb = min_not_zero(max_hw_sectors_kb, (unsigned long)
252 q->limits.max_dev_sectors >> 1);
254 if (max_sectors_kb > max_hw_sectors_kb || max_sectors_kb < page_kb)
257 spin_lock_irq(&q->queue_lock);
258 q->limits.max_sectors = max_sectors_kb << 1;
260 q->disk->bdi->io_pages = max_sectors_kb >> (PAGE_SHIFT - 10);
261 spin_unlock_irq(&q->queue_lock);
266 static ssize_t queue_max_hw_sectors_show(struct request_queue *q, char *page)
268 int max_hw_sectors_kb = queue_max_hw_sectors(q) >> 1;
270 return queue_var_show(max_hw_sectors_kb, page);
273 static ssize_t queue_virt_boundary_mask_show(struct request_queue *q, char *page)
275 return queue_var_show(q->limits.virt_boundary_mask, page);
278 #define QUEUE_SYSFS_BIT_FNS(name, flag, neg) \
280 queue_##name##_show(struct request_queue *q, char *page) \
283 bit = test_bit(QUEUE_FLAG_##flag, &q->queue_flags); \
284 return queue_var_show(neg ? !bit : bit, page); \
287 queue_##name##_store(struct request_queue *q, const char *page, size_t count) \
291 ret = queue_var_store(&val, page, count); \
298 blk_queue_flag_set(QUEUE_FLAG_##flag, q); \
300 blk_queue_flag_clear(QUEUE_FLAG_##flag, q); \
304 QUEUE_SYSFS_BIT_FNS(nonrot, NONROT, 1);
305 QUEUE_SYSFS_BIT_FNS(random, ADD_RANDOM, 0);
306 QUEUE_SYSFS_BIT_FNS(iostats, IO_STAT, 0);
307 QUEUE_SYSFS_BIT_FNS(stable_writes, STABLE_WRITES, 0);
308 #undef QUEUE_SYSFS_BIT_FNS
310 static ssize_t queue_zoned_show(struct request_queue *q, char *page)
312 switch (blk_queue_zoned_model(q)) {
314 return sprintf(page, "host-aware\n");
316 return sprintf(page, "host-managed\n");
318 return sprintf(page, "none\n");
322 static ssize_t queue_nr_zones_show(struct request_queue *q, char *page)
324 return queue_var_show(blk_queue_nr_zones(q), page);
327 static ssize_t queue_max_open_zones_show(struct request_queue *q, char *page)
329 return queue_var_show(queue_max_open_zones(q), page);
332 static ssize_t queue_max_active_zones_show(struct request_queue *q, char *page)
334 return queue_var_show(queue_max_active_zones(q), page);
337 static ssize_t queue_nomerges_show(struct request_queue *q, char *page)
339 return queue_var_show((blk_queue_nomerges(q) << 1) |
340 blk_queue_noxmerges(q), page);
343 static ssize_t queue_nomerges_store(struct request_queue *q, const char *page,
347 ssize_t ret = queue_var_store(&nm, page, count);
352 blk_queue_flag_clear(QUEUE_FLAG_NOMERGES, q);
353 blk_queue_flag_clear(QUEUE_FLAG_NOXMERGES, q);
355 blk_queue_flag_set(QUEUE_FLAG_NOMERGES, q);
357 blk_queue_flag_set(QUEUE_FLAG_NOXMERGES, q);
362 static ssize_t queue_rq_affinity_show(struct request_queue *q, char *page)
364 bool set = test_bit(QUEUE_FLAG_SAME_COMP, &q->queue_flags);
365 bool force = test_bit(QUEUE_FLAG_SAME_FORCE, &q->queue_flags);
367 return queue_var_show(set << force, page);
371 queue_rq_affinity_store(struct request_queue *q, const char *page, size_t count)
373 ssize_t ret = -EINVAL;
377 ret = queue_var_store(&val, page, count);
382 blk_queue_flag_set(QUEUE_FLAG_SAME_COMP, q);
383 blk_queue_flag_set(QUEUE_FLAG_SAME_FORCE, q);
384 } else if (val == 1) {
385 blk_queue_flag_set(QUEUE_FLAG_SAME_COMP, q);
386 blk_queue_flag_clear(QUEUE_FLAG_SAME_FORCE, q);
387 } else if (val == 0) {
388 blk_queue_flag_clear(QUEUE_FLAG_SAME_COMP, q);
389 blk_queue_flag_clear(QUEUE_FLAG_SAME_FORCE, q);
395 static ssize_t queue_poll_delay_show(struct request_queue *q, char *page)
399 if (q->poll_nsec == BLK_MQ_POLL_CLASSIC)
400 val = BLK_MQ_POLL_CLASSIC;
402 val = q->poll_nsec / 1000;
404 return sprintf(page, "%d\n", val);
407 static ssize_t queue_poll_delay_store(struct request_queue *q, const char *page,
412 if (!q->mq_ops || !q->mq_ops->poll)
415 err = kstrtoint(page, 10, &val);
419 if (val == BLK_MQ_POLL_CLASSIC)
420 q->poll_nsec = BLK_MQ_POLL_CLASSIC;
422 q->poll_nsec = val * 1000;
429 static ssize_t queue_poll_show(struct request_queue *q, char *page)
431 return queue_var_show(test_bit(QUEUE_FLAG_POLL, &q->queue_flags), page);
434 static ssize_t queue_poll_store(struct request_queue *q, const char *page,
437 if (!test_bit(QUEUE_FLAG_POLL, &q->queue_flags))
439 pr_info_ratelimited("writes to the poll attribute are ignored.\n");
440 pr_info_ratelimited("please use driver specific parameters instead.\n");
444 static ssize_t queue_io_timeout_show(struct request_queue *q, char *page)
446 return sprintf(page, "%u\n", jiffies_to_msecs(q->rq_timeout));
449 static ssize_t queue_io_timeout_store(struct request_queue *q, const char *page,
455 err = kstrtou32(page, 10, &val);
459 blk_queue_rq_timeout(q, msecs_to_jiffies(val));
464 static ssize_t queue_wb_lat_show(struct request_queue *q, char *page)
469 return sprintf(page, "%llu\n", div_u64(wbt_get_min_lat(q), 1000));
472 static ssize_t queue_wb_lat_store(struct request_queue *q, const char *page,
479 ret = queue_var_store64(&val, page);
485 rqos = wbt_rq_qos(q);
493 val = wbt_default_latency_nsec(q);
497 if (wbt_get_min_lat(q) == val)
501 * Ensure that the queue is idled, in case the latency update
502 * ends up either enabling or disabling wbt completely. We can't
503 * have IO inflight if that happens.
505 blk_mq_freeze_queue(q);
506 blk_mq_quiesce_queue(q);
508 wbt_set_min_lat(q, val);
510 blk_mq_unquiesce_queue(q);
511 blk_mq_unfreeze_queue(q);
516 static ssize_t queue_wc_show(struct request_queue *q, char *page)
518 if (test_bit(QUEUE_FLAG_WC, &q->queue_flags))
519 return sprintf(page, "write back\n");
521 return sprintf(page, "write through\n");
524 static ssize_t queue_wc_store(struct request_queue *q, const char *page,
529 if (!strncmp(page, "write back", 10))
531 else if (!strncmp(page, "write through", 13) ||
532 !strncmp(page, "none", 4))
539 blk_queue_flag_set(QUEUE_FLAG_WC, q);
541 blk_queue_flag_clear(QUEUE_FLAG_WC, q);
546 static ssize_t queue_fua_show(struct request_queue *q, char *page)
548 return sprintf(page, "%u\n", test_bit(QUEUE_FLAG_FUA, &q->queue_flags));
551 static ssize_t queue_dax_show(struct request_queue *q, char *page)
553 return queue_var_show(blk_queue_dax(q), page);
556 #define QUEUE_RO_ENTRY(_prefix, _name) \
557 static struct queue_sysfs_entry _prefix##_entry = { \
558 .attr = { .name = _name, .mode = 0444 }, \
559 .show = _prefix##_show, \
562 #define QUEUE_RW_ENTRY(_prefix, _name) \
563 static struct queue_sysfs_entry _prefix##_entry = { \
564 .attr = { .name = _name, .mode = 0644 }, \
565 .show = _prefix##_show, \
566 .store = _prefix##_store, \
569 QUEUE_RW_ENTRY(queue_requests, "nr_requests");
570 QUEUE_RW_ENTRY(queue_ra, "read_ahead_kb");
571 QUEUE_RW_ENTRY(queue_max_sectors, "max_sectors_kb");
572 QUEUE_RO_ENTRY(queue_max_hw_sectors, "max_hw_sectors_kb");
573 QUEUE_RO_ENTRY(queue_max_segments, "max_segments");
574 QUEUE_RO_ENTRY(queue_max_integrity_segments, "max_integrity_segments");
575 QUEUE_RO_ENTRY(queue_max_segment_size, "max_segment_size");
576 QUEUE_RW_ENTRY(elv_iosched, "scheduler");
578 QUEUE_RO_ENTRY(queue_logical_block_size, "logical_block_size");
579 QUEUE_RO_ENTRY(queue_physical_block_size, "physical_block_size");
580 QUEUE_RO_ENTRY(queue_chunk_sectors, "chunk_sectors");
581 QUEUE_RO_ENTRY(queue_io_min, "minimum_io_size");
582 QUEUE_RO_ENTRY(queue_io_opt, "optimal_io_size");
584 QUEUE_RO_ENTRY(queue_max_discard_segments, "max_discard_segments");
585 QUEUE_RO_ENTRY(queue_discard_granularity, "discard_granularity");
586 QUEUE_RO_ENTRY(queue_discard_max_hw, "discard_max_hw_bytes");
587 QUEUE_RW_ENTRY(queue_discard_max, "discard_max_bytes");
588 QUEUE_RO_ENTRY(queue_discard_zeroes_data, "discard_zeroes_data");
590 QUEUE_RO_ENTRY(queue_write_same_max, "write_same_max_bytes");
591 QUEUE_RO_ENTRY(queue_write_zeroes_max, "write_zeroes_max_bytes");
592 QUEUE_RO_ENTRY(queue_zone_append_max, "zone_append_max_bytes");
593 QUEUE_RO_ENTRY(queue_zone_write_granularity, "zone_write_granularity");
595 QUEUE_RO_ENTRY(queue_zoned, "zoned");
596 QUEUE_RO_ENTRY(queue_nr_zones, "nr_zones");
597 QUEUE_RO_ENTRY(queue_max_open_zones, "max_open_zones");
598 QUEUE_RO_ENTRY(queue_max_active_zones, "max_active_zones");
600 QUEUE_RW_ENTRY(queue_nomerges, "nomerges");
601 QUEUE_RW_ENTRY(queue_rq_affinity, "rq_affinity");
602 QUEUE_RW_ENTRY(queue_poll, "io_poll");
603 QUEUE_RW_ENTRY(queue_poll_delay, "io_poll_delay");
604 QUEUE_RW_ENTRY(queue_wc, "write_cache");
605 QUEUE_RO_ENTRY(queue_fua, "fua");
606 QUEUE_RO_ENTRY(queue_dax, "dax");
607 QUEUE_RW_ENTRY(queue_io_timeout, "io_timeout");
608 QUEUE_RW_ENTRY(queue_wb_lat, "wbt_lat_usec");
609 QUEUE_RO_ENTRY(queue_virt_boundary_mask, "virt_boundary_mask");
611 #ifdef CONFIG_BLK_DEV_THROTTLING_LOW
612 QUEUE_RW_ENTRY(blk_throtl_sample_time, "throttle_sample_time");
615 /* legacy alias for logical_block_size: */
616 static struct queue_sysfs_entry queue_hw_sector_size_entry = {
617 .attr = {.name = "hw_sector_size", .mode = 0444 },
618 .show = queue_logical_block_size_show,
621 QUEUE_RW_ENTRY(queue_nonrot, "rotational");
622 QUEUE_RW_ENTRY(queue_iostats, "iostats");
623 QUEUE_RW_ENTRY(queue_random, "add_random");
624 QUEUE_RW_ENTRY(queue_stable_writes, "stable_writes");
626 static struct attribute *queue_attrs[] = {
627 &queue_requests_entry.attr,
628 &queue_ra_entry.attr,
629 &queue_max_hw_sectors_entry.attr,
630 &queue_max_sectors_entry.attr,
631 &queue_max_segments_entry.attr,
632 &queue_max_discard_segments_entry.attr,
633 &queue_max_integrity_segments_entry.attr,
634 &queue_max_segment_size_entry.attr,
635 &elv_iosched_entry.attr,
636 &queue_hw_sector_size_entry.attr,
637 &queue_logical_block_size_entry.attr,
638 &queue_physical_block_size_entry.attr,
639 &queue_chunk_sectors_entry.attr,
640 &queue_io_min_entry.attr,
641 &queue_io_opt_entry.attr,
642 &queue_discard_granularity_entry.attr,
643 &queue_discard_max_entry.attr,
644 &queue_discard_max_hw_entry.attr,
645 &queue_discard_zeroes_data_entry.attr,
646 &queue_write_same_max_entry.attr,
647 &queue_write_zeroes_max_entry.attr,
648 &queue_zone_append_max_entry.attr,
649 &queue_zone_write_granularity_entry.attr,
650 &queue_nonrot_entry.attr,
651 &queue_zoned_entry.attr,
652 &queue_nr_zones_entry.attr,
653 &queue_max_open_zones_entry.attr,
654 &queue_max_active_zones_entry.attr,
655 &queue_nomerges_entry.attr,
656 &queue_rq_affinity_entry.attr,
657 &queue_iostats_entry.attr,
658 &queue_stable_writes_entry.attr,
659 &queue_random_entry.attr,
660 &queue_poll_entry.attr,
661 &queue_wc_entry.attr,
662 &queue_fua_entry.attr,
663 &queue_dax_entry.attr,
664 &queue_wb_lat_entry.attr,
665 &queue_poll_delay_entry.attr,
666 &queue_io_timeout_entry.attr,
667 #ifdef CONFIG_BLK_DEV_THROTTLING_LOW
668 &blk_throtl_sample_time_entry.attr,
670 &queue_virt_boundary_mask_entry.attr,
674 static umode_t queue_attr_visible(struct kobject *kobj, struct attribute *attr,
677 struct request_queue *q =
678 container_of(kobj, struct request_queue, kobj);
680 if (attr == &queue_io_timeout_entry.attr &&
681 (!q->mq_ops || !q->mq_ops->timeout))
684 if ((attr == &queue_max_open_zones_entry.attr ||
685 attr == &queue_max_active_zones_entry.attr) &&
686 !blk_queue_is_zoned(q))
692 static struct attribute_group queue_attr_group = {
693 .attrs = queue_attrs,
694 .is_visible = queue_attr_visible,
698 #define to_queue(atr) container_of((atr), struct queue_sysfs_entry, attr)
701 queue_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
703 struct queue_sysfs_entry *entry = to_queue(attr);
704 struct request_queue *q =
705 container_of(kobj, struct request_queue, kobj);
710 mutex_lock(&q->sysfs_lock);
711 res = entry->show(q, page);
712 mutex_unlock(&q->sysfs_lock);
717 queue_attr_store(struct kobject *kobj, struct attribute *attr,
718 const char *page, size_t length)
720 struct queue_sysfs_entry *entry = to_queue(attr);
721 struct request_queue *q;
727 q = container_of(kobj, struct request_queue, kobj);
728 mutex_lock(&q->sysfs_lock);
729 res = entry->store(q, page, length);
730 mutex_unlock(&q->sysfs_lock);
734 static void blk_free_queue_rcu(struct rcu_head *rcu_head)
736 struct request_queue *q = container_of(rcu_head, struct request_queue,
739 kmem_cache_free(blk_get_queue_kmem_cache(blk_queue_has_srcu(q)), q);
742 /* Unconfigure the I/O scheduler and dissociate from the cgroup controller. */
743 static void blk_exit_queue(struct request_queue *q)
746 * Since the I/O scheduler exit code may access cgroup information,
747 * perform I/O scheduler exit before disassociating from the block
756 * Remove all references to @q from the block cgroup controller before
757 * restoring @q->queue_lock to avoid that restoring this pointer causes
758 * e.g. blkcg_print_blkgs() to crash.
764 * blk_release_queue - releases all allocated resources of the request_queue
765 * @kobj: pointer to a kobject, whose container is a request_queue
767 * This function releases all allocated resources of the request queue.
769 * The struct request_queue refcount is incremented with blk_get_queue() and
770 * decremented with blk_put_queue(). Once the refcount reaches 0 this function
773 * For drivers that have a request_queue on a gendisk and added with
774 * __device_add_disk() the refcount to request_queue will reach 0 with
775 * the last put_disk() called by the driver. For drivers which don't use
776 * __device_add_disk() this happens with blk_cleanup_queue().
778 * Drivers exist which depend on the release of the request_queue to be
779 * synchronous, it should not be deferred.
783 static void blk_release_queue(struct kobject *kobj)
785 struct request_queue *q =
786 container_of(kobj, struct request_queue, kobj);
791 blk_stat_remove_callback(q, q->poll_cb);
792 blk_stat_free_callback(q->poll_cb);
796 blk_free_queue_stats(q->stats);
799 blk_queue_free_zone_bitmaps(q);
804 blk_trace_shutdown(q);
805 mutex_lock(&q->debugfs_mutex);
806 debugfs_remove_recursive(q->debugfs_dir);
807 mutex_unlock(&q->debugfs_mutex);
810 blk_mq_debugfs_unregister(q);
812 bioset_exit(&q->bio_split);
814 if (blk_queue_has_srcu(q))
815 cleanup_srcu_struct(q->srcu);
817 ida_simple_remove(&blk_queue_ida, q->id);
818 call_rcu(&q->rcu_head, blk_free_queue_rcu);
821 static const struct sysfs_ops queue_sysfs_ops = {
822 .show = queue_attr_show,
823 .store = queue_attr_store,
826 struct kobj_type blk_queue_ktype = {
827 .sysfs_ops = &queue_sysfs_ops,
828 .release = blk_release_queue,
832 * blk_register_queue - register a block layer queue with sysfs
833 * @disk: Disk of which the request queue should be registered with sysfs.
835 int blk_register_queue(struct gendisk *disk)
838 struct device *dev = disk_to_dev(disk);
839 struct request_queue *q = disk->queue;
841 ret = blk_trace_init_sysfs(dev);
845 mutex_lock(&q->sysfs_dir_lock);
847 ret = kobject_add(&q->kobj, kobject_get(&dev->kobj), "%s", "queue");
849 blk_trace_remove_sysfs(dev);
853 ret = sysfs_create_group(&q->kobj, &queue_attr_group);
855 blk_trace_remove_sysfs(dev);
856 kobject_del(&q->kobj);
857 kobject_put(&dev->kobj);
861 mutex_lock(&q->debugfs_mutex);
862 q->debugfs_dir = debugfs_create_dir(kobject_name(q->kobj.parent),
864 mutex_unlock(&q->debugfs_mutex);
866 if (queue_is_mq(q)) {
867 __blk_mq_register_dev(dev, q);
868 blk_mq_debugfs_register(q);
871 mutex_lock(&q->sysfs_lock);
873 ret = disk_register_independent_access_ranges(disk, NULL);
878 ret = elv_register_queue(q, false);
883 blk_queue_flag_set(QUEUE_FLAG_REGISTERED, q);
884 wbt_enable_default(q);
885 blk_throtl_register_queue(q);
887 /* Now everything is ready and send out KOBJ_ADD uevent */
888 kobject_uevent(&q->kobj, KOBJ_ADD);
890 kobject_uevent(&q->elevator->kobj, KOBJ_ADD);
891 mutex_unlock(&q->sysfs_lock);
894 mutex_unlock(&q->sysfs_dir_lock);
897 * SCSI probing may synchronously create and destroy a lot of
898 * request_queues for non-existent devices. Shutting down a fully
899 * functional queue takes measureable wallclock time as RCU grace
900 * periods are involved. To avoid excessive latency in these
901 * cases, a request_queue starts out in a degraded mode which is
902 * faster to shut down and is made fully functional here as
903 * request_queues for non-existent devices never get registered.
905 if (!blk_queue_init_done(q)) {
906 blk_queue_flag_set(QUEUE_FLAG_INIT_DONE, q);
907 percpu_ref_switch_to_percpu(&q->q_usage_counter);
913 disk_unregister_independent_access_ranges(disk);
914 mutex_unlock(&q->sysfs_lock);
915 mutex_unlock(&q->sysfs_dir_lock);
916 kobject_del(&q->kobj);
917 blk_trace_remove_sysfs(dev);
918 kobject_put(&dev->kobj);
924 * blk_unregister_queue - counterpart of blk_register_queue()
925 * @disk: Disk of which the request queue should be unregistered from sysfs.
927 * Note: the caller is responsible for guaranteeing that this function is called
928 * after blk_register_queue() has finished.
930 void blk_unregister_queue(struct gendisk *disk)
932 struct request_queue *q = disk->queue;
937 /* Return early if disk->queue was never registered. */
938 if (!blk_queue_registered(q))
942 * Since sysfs_remove_dir() prevents adding new directory entries
943 * before removal of existing entries starts, protect against
944 * concurrent elv_iosched_store() calls.
946 mutex_lock(&q->sysfs_lock);
947 blk_queue_flag_clear(QUEUE_FLAG_REGISTERED, q);
948 mutex_unlock(&q->sysfs_lock);
950 mutex_lock(&q->sysfs_dir_lock);
952 * Remove the sysfs attributes before unregistering the queue data
953 * structures that can be modified through sysfs.
956 blk_mq_unregister_dev(disk_to_dev(disk), q);
958 kobject_uevent(&q->kobj, KOBJ_REMOVE);
959 kobject_del(&q->kobj);
960 blk_trace_remove_sysfs(disk_to_dev(disk));
962 mutex_lock(&q->sysfs_lock);
964 elv_unregister_queue(q);
965 disk_unregister_independent_access_ranges(disk);
966 mutex_unlock(&q->sysfs_lock);
967 mutex_unlock(&q->sysfs_dir_lock);
969 kobject_put(&disk_to_dev(disk)->kobj);