2 * Functions related to sysfs handling
4 #include <linux/kernel.h>
5 #include <linux/slab.h>
6 #include <linux/module.h>
8 #include <linux/blkdev.h>
9 #include <linux/backing-dev.h>
10 #include <linux/blktrace_api.h>
11 #include <linux/blk-mq.h>
12 #include <linux/blk-cgroup.h>
18 struct queue_sysfs_entry {
19 struct attribute attr;
20 ssize_t (*show)(struct request_queue *, char *);
21 ssize_t (*store)(struct request_queue *, const char *, size_t);
25 queue_var_show(unsigned long var, char *page)
27 return sprintf(page, "%lu\n", var);
31 queue_var_store(unsigned long *var, const char *page, size_t count)
36 err = kstrtoul(page, 10, &v);
37 if (err || v > UINT_MAX)
45 static ssize_t queue_var_store64(s64 *var, const char *page)
50 err = kstrtos64(page, 10, &v);
58 static ssize_t queue_requests_show(struct request_queue *q, char *page)
60 return queue_var_show(q->nr_requests, (page));
64 queue_requests_store(struct request_queue *q, const char *page, size_t count)
69 if (!q->request_fn && !q->mq_ops)
72 ret = queue_var_store(&nr, page, count);
76 if (nr < BLKDEV_MIN_RQ)
80 err = blk_update_nr_requests(q, nr);
82 err = blk_mq_update_nr_requests(q, nr);
90 static ssize_t queue_ra_show(struct request_queue *q, char *page)
92 unsigned long ra_kb = q->backing_dev_info->ra_pages <<
95 return queue_var_show(ra_kb, (page));
99 queue_ra_store(struct request_queue *q, const char *page, size_t count)
102 ssize_t ret = queue_var_store(&ra_kb, page, count);
107 q->backing_dev_info->ra_pages = ra_kb >> (PAGE_SHIFT - 10);
112 static ssize_t queue_max_sectors_show(struct request_queue *q, char *page)
114 int max_sectors_kb = queue_max_sectors(q) >> 1;
116 return queue_var_show(max_sectors_kb, (page));
119 static ssize_t queue_max_segments_show(struct request_queue *q, char *page)
121 return queue_var_show(queue_max_segments(q), (page));
124 static ssize_t queue_max_discard_segments_show(struct request_queue *q,
127 return queue_var_show(queue_max_discard_segments(q), (page));
130 static ssize_t queue_max_integrity_segments_show(struct request_queue *q, char *page)
132 return queue_var_show(q->limits.max_integrity_segments, (page));
135 static ssize_t queue_max_segment_size_show(struct request_queue *q, char *page)
137 if (blk_queue_cluster(q))
138 return queue_var_show(queue_max_segment_size(q), (page));
140 return queue_var_show(PAGE_SIZE, (page));
143 static ssize_t queue_logical_block_size_show(struct request_queue *q, char *page)
145 return queue_var_show(queue_logical_block_size(q), page);
148 static ssize_t queue_physical_block_size_show(struct request_queue *q, char *page)
150 return queue_var_show(queue_physical_block_size(q), page);
153 static ssize_t queue_chunk_sectors_show(struct request_queue *q, char *page)
155 return queue_var_show(q->limits.chunk_sectors, page);
158 static ssize_t queue_io_min_show(struct request_queue *q, char *page)
160 return queue_var_show(queue_io_min(q), page);
163 static ssize_t queue_io_opt_show(struct request_queue *q, char *page)
165 return queue_var_show(queue_io_opt(q), page);
168 static ssize_t queue_discard_granularity_show(struct request_queue *q, char *page)
170 return queue_var_show(q->limits.discard_granularity, page);
173 static ssize_t queue_discard_max_hw_show(struct request_queue *q, char *page)
176 return sprintf(page, "%llu\n",
177 (unsigned long long)q->limits.max_hw_discard_sectors << 9);
180 static ssize_t queue_discard_max_show(struct request_queue *q, char *page)
182 return sprintf(page, "%llu\n",
183 (unsigned long long)q->limits.max_discard_sectors << 9);
186 static ssize_t queue_discard_max_store(struct request_queue *q,
187 const char *page, size_t count)
189 unsigned long max_discard;
190 ssize_t ret = queue_var_store(&max_discard, page, count);
195 if (max_discard & (q->limits.discard_granularity - 1))
199 if (max_discard > UINT_MAX)
202 if (max_discard > q->limits.max_hw_discard_sectors)
203 max_discard = q->limits.max_hw_discard_sectors;
205 q->limits.max_discard_sectors = max_discard;
209 static ssize_t queue_discard_zeroes_data_show(struct request_queue *q, char *page)
211 return queue_var_show(queue_discard_zeroes_data(q), page);
214 static ssize_t queue_write_same_max_show(struct request_queue *q, char *page)
216 return sprintf(page, "%llu\n",
217 (unsigned long long)q->limits.max_write_same_sectors << 9);
220 static ssize_t queue_write_zeroes_max_show(struct request_queue *q, char *page)
222 return sprintf(page, "%llu\n",
223 (unsigned long long)q->limits.max_write_zeroes_sectors << 9);
227 queue_max_sectors_store(struct request_queue *q, const char *page, size_t count)
229 unsigned long max_sectors_kb,
230 max_hw_sectors_kb = queue_max_hw_sectors(q) >> 1,
231 page_kb = 1 << (PAGE_SHIFT - 10);
232 ssize_t ret = queue_var_store(&max_sectors_kb, page, count);
237 max_hw_sectors_kb = min_not_zero(max_hw_sectors_kb, (unsigned long)
238 q->limits.max_dev_sectors >> 1);
240 if (max_sectors_kb > max_hw_sectors_kb || max_sectors_kb < page_kb)
243 spin_lock_irq(q->queue_lock);
244 q->limits.max_sectors = max_sectors_kb << 1;
245 q->backing_dev_info->io_pages = max_sectors_kb >> (PAGE_SHIFT - 10);
246 spin_unlock_irq(q->queue_lock);
251 static ssize_t queue_max_hw_sectors_show(struct request_queue *q, char *page)
253 int max_hw_sectors_kb = queue_max_hw_sectors(q) >> 1;
255 return queue_var_show(max_hw_sectors_kb, (page));
258 #define QUEUE_SYSFS_BIT_FNS(name, flag, neg) \
260 queue_show_##name(struct request_queue *q, char *page) \
263 bit = test_bit(QUEUE_FLAG_##flag, &q->queue_flags); \
264 return queue_var_show(neg ? !bit : bit, page); \
267 queue_store_##name(struct request_queue *q, const char *page, size_t count) \
271 ret = queue_var_store(&val, page, count); \
277 spin_lock_irq(q->queue_lock); \
279 queue_flag_set(QUEUE_FLAG_##flag, q); \
281 queue_flag_clear(QUEUE_FLAG_##flag, q); \
282 spin_unlock_irq(q->queue_lock); \
286 QUEUE_SYSFS_BIT_FNS(nonrot, NONROT, 1);
287 QUEUE_SYSFS_BIT_FNS(random, ADD_RANDOM, 0);
288 QUEUE_SYSFS_BIT_FNS(iostats, IO_STAT, 0);
289 #undef QUEUE_SYSFS_BIT_FNS
291 static ssize_t queue_zoned_show(struct request_queue *q, char *page)
293 switch (blk_queue_zoned_model(q)) {
295 return sprintf(page, "host-aware\n");
297 return sprintf(page, "host-managed\n");
299 return sprintf(page, "none\n");
303 static ssize_t queue_nomerges_show(struct request_queue *q, char *page)
305 return queue_var_show((blk_queue_nomerges(q) << 1) |
306 blk_queue_noxmerges(q), page);
309 static ssize_t queue_nomerges_store(struct request_queue *q, const char *page,
313 ssize_t ret = queue_var_store(&nm, page, count);
318 spin_lock_irq(q->queue_lock);
319 queue_flag_clear(QUEUE_FLAG_NOMERGES, q);
320 queue_flag_clear(QUEUE_FLAG_NOXMERGES, q);
322 queue_flag_set(QUEUE_FLAG_NOMERGES, q);
324 queue_flag_set(QUEUE_FLAG_NOXMERGES, q);
325 spin_unlock_irq(q->queue_lock);
330 static ssize_t queue_rq_affinity_show(struct request_queue *q, char *page)
332 bool set = test_bit(QUEUE_FLAG_SAME_COMP, &q->queue_flags);
333 bool force = test_bit(QUEUE_FLAG_SAME_FORCE, &q->queue_flags);
335 return queue_var_show(set << force, page);
339 queue_rq_affinity_store(struct request_queue *q, const char *page, size_t count)
341 ssize_t ret = -EINVAL;
345 ret = queue_var_store(&val, page, count);
349 spin_lock_irq(q->queue_lock);
351 queue_flag_set(QUEUE_FLAG_SAME_COMP, q);
352 queue_flag_set(QUEUE_FLAG_SAME_FORCE, q);
353 } else if (val == 1) {
354 queue_flag_set(QUEUE_FLAG_SAME_COMP, q);
355 queue_flag_clear(QUEUE_FLAG_SAME_FORCE, q);
356 } else if (val == 0) {
357 queue_flag_clear(QUEUE_FLAG_SAME_COMP, q);
358 queue_flag_clear(QUEUE_FLAG_SAME_FORCE, q);
360 spin_unlock_irq(q->queue_lock);
365 static ssize_t queue_poll_delay_show(struct request_queue *q, char *page)
369 if (q->poll_nsec == -1)
372 val = q->poll_nsec / 1000;
374 return sprintf(page, "%d\n", val);
377 static ssize_t queue_poll_delay_store(struct request_queue *q, const char *page,
382 if (!q->mq_ops || !q->mq_ops->poll)
385 err = kstrtoint(page, 10, &val);
392 q->poll_nsec = val * 1000;
397 static ssize_t queue_poll_show(struct request_queue *q, char *page)
399 return queue_var_show(test_bit(QUEUE_FLAG_POLL, &q->queue_flags), page);
402 static ssize_t queue_poll_store(struct request_queue *q, const char *page,
405 unsigned long poll_on;
408 if (!q->mq_ops || !q->mq_ops->poll)
411 ret = queue_var_store(&poll_on, page, count);
415 spin_lock_irq(q->queue_lock);
417 queue_flag_set(QUEUE_FLAG_POLL, q);
419 queue_flag_clear(QUEUE_FLAG_POLL, q);
420 spin_unlock_irq(q->queue_lock);
425 static ssize_t queue_wb_lat_show(struct request_queue *q, char *page)
430 return sprintf(page, "%llu\n", div_u64(q->rq_wb->min_lat_nsec, 1000));
433 static ssize_t queue_wb_lat_store(struct request_queue *q, const char *page,
440 ret = queue_var_store64(&val, page);
458 rwb->min_lat_nsec = wbt_default_latency_nsec(q);
460 rwb->min_lat_nsec = val * 1000ULL;
462 if (rwb->enable_state == WBT_STATE_ON_DEFAULT)
463 rwb->enable_state = WBT_STATE_ON_MANUAL;
465 wbt_update_limits(rwb);
469 static ssize_t queue_wc_show(struct request_queue *q, char *page)
471 if (test_bit(QUEUE_FLAG_WC, &q->queue_flags))
472 return sprintf(page, "write back\n");
474 return sprintf(page, "write through\n");
477 static ssize_t queue_wc_store(struct request_queue *q, const char *page,
482 if (!strncmp(page, "write back", 10))
484 else if (!strncmp(page, "write through", 13) ||
485 !strncmp(page, "none", 4))
491 spin_lock_irq(q->queue_lock);
493 queue_flag_set(QUEUE_FLAG_WC, q);
495 queue_flag_clear(QUEUE_FLAG_WC, q);
496 spin_unlock_irq(q->queue_lock);
501 static ssize_t queue_dax_show(struct request_queue *q, char *page)
503 return queue_var_show(blk_queue_dax(q), page);
506 static struct queue_sysfs_entry queue_requests_entry = {
507 .attr = {.name = "nr_requests", .mode = S_IRUGO | S_IWUSR },
508 .show = queue_requests_show,
509 .store = queue_requests_store,
512 static struct queue_sysfs_entry queue_ra_entry = {
513 .attr = {.name = "read_ahead_kb", .mode = S_IRUGO | S_IWUSR },
514 .show = queue_ra_show,
515 .store = queue_ra_store,
518 static struct queue_sysfs_entry queue_max_sectors_entry = {
519 .attr = {.name = "max_sectors_kb", .mode = S_IRUGO | S_IWUSR },
520 .show = queue_max_sectors_show,
521 .store = queue_max_sectors_store,
524 static struct queue_sysfs_entry queue_max_hw_sectors_entry = {
525 .attr = {.name = "max_hw_sectors_kb", .mode = S_IRUGO },
526 .show = queue_max_hw_sectors_show,
529 static struct queue_sysfs_entry queue_max_segments_entry = {
530 .attr = {.name = "max_segments", .mode = S_IRUGO },
531 .show = queue_max_segments_show,
534 static struct queue_sysfs_entry queue_max_discard_segments_entry = {
535 .attr = {.name = "max_discard_segments", .mode = S_IRUGO },
536 .show = queue_max_discard_segments_show,
539 static struct queue_sysfs_entry queue_max_integrity_segments_entry = {
540 .attr = {.name = "max_integrity_segments", .mode = S_IRUGO },
541 .show = queue_max_integrity_segments_show,
544 static struct queue_sysfs_entry queue_max_segment_size_entry = {
545 .attr = {.name = "max_segment_size", .mode = S_IRUGO },
546 .show = queue_max_segment_size_show,
549 static struct queue_sysfs_entry queue_iosched_entry = {
550 .attr = {.name = "scheduler", .mode = S_IRUGO | S_IWUSR },
551 .show = elv_iosched_show,
552 .store = elv_iosched_store,
555 static struct queue_sysfs_entry queue_hw_sector_size_entry = {
556 .attr = {.name = "hw_sector_size", .mode = S_IRUGO },
557 .show = queue_logical_block_size_show,
560 static struct queue_sysfs_entry queue_logical_block_size_entry = {
561 .attr = {.name = "logical_block_size", .mode = S_IRUGO },
562 .show = queue_logical_block_size_show,
565 static struct queue_sysfs_entry queue_physical_block_size_entry = {
566 .attr = {.name = "physical_block_size", .mode = S_IRUGO },
567 .show = queue_physical_block_size_show,
570 static struct queue_sysfs_entry queue_chunk_sectors_entry = {
571 .attr = {.name = "chunk_sectors", .mode = S_IRUGO },
572 .show = queue_chunk_sectors_show,
575 static struct queue_sysfs_entry queue_io_min_entry = {
576 .attr = {.name = "minimum_io_size", .mode = S_IRUGO },
577 .show = queue_io_min_show,
580 static struct queue_sysfs_entry queue_io_opt_entry = {
581 .attr = {.name = "optimal_io_size", .mode = S_IRUGO },
582 .show = queue_io_opt_show,
585 static struct queue_sysfs_entry queue_discard_granularity_entry = {
586 .attr = {.name = "discard_granularity", .mode = S_IRUGO },
587 .show = queue_discard_granularity_show,
590 static struct queue_sysfs_entry queue_discard_max_hw_entry = {
591 .attr = {.name = "discard_max_hw_bytes", .mode = S_IRUGO },
592 .show = queue_discard_max_hw_show,
595 static struct queue_sysfs_entry queue_discard_max_entry = {
596 .attr = {.name = "discard_max_bytes", .mode = S_IRUGO | S_IWUSR },
597 .show = queue_discard_max_show,
598 .store = queue_discard_max_store,
601 static struct queue_sysfs_entry queue_discard_zeroes_data_entry = {
602 .attr = {.name = "discard_zeroes_data", .mode = S_IRUGO },
603 .show = queue_discard_zeroes_data_show,
606 static struct queue_sysfs_entry queue_write_same_max_entry = {
607 .attr = {.name = "write_same_max_bytes", .mode = S_IRUGO },
608 .show = queue_write_same_max_show,
611 static struct queue_sysfs_entry queue_write_zeroes_max_entry = {
612 .attr = {.name = "write_zeroes_max_bytes", .mode = S_IRUGO },
613 .show = queue_write_zeroes_max_show,
616 static struct queue_sysfs_entry queue_nonrot_entry = {
617 .attr = {.name = "rotational", .mode = S_IRUGO | S_IWUSR },
618 .show = queue_show_nonrot,
619 .store = queue_store_nonrot,
622 static struct queue_sysfs_entry queue_zoned_entry = {
623 .attr = {.name = "zoned", .mode = S_IRUGO },
624 .show = queue_zoned_show,
627 static struct queue_sysfs_entry queue_nomerges_entry = {
628 .attr = {.name = "nomerges", .mode = S_IRUGO | S_IWUSR },
629 .show = queue_nomerges_show,
630 .store = queue_nomerges_store,
633 static struct queue_sysfs_entry queue_rq_affinity_entry = {
634 .attr = {.name = "rq_affinity", .mode = S_IRUGO | S_IWUSR },
635 .show = queue_rq_affinity_show,
636 .store = queue_rq_affinity_store,
639 static struct queue_sysfs_entry queue_iostats_entry = {
640 .attr = {.name = "iostats", .mode = S_IRUGO | S_IWUSR },
641 .show = queue_show_iostats,
642 .store = queue_store_iostats,
645 static struct queue_sysfs_entry queue_random_entry = {
646 .attr = {.name = "add_random", .mode = S_IRUGO | S_IWUSR },
647 .show = queue_show_random,
648 .store = queue_store_random,
651 static struct queue_sysfs_entry queue_poll_entry = {
652 .attr = {.name = "io_poll", .mode = S_IRUGO | S_IWUSR },
653 .show = queue_poll_show,
654 .store = queue_poll_store,
657 static struct queue_sysfs_entry queue_poll_delay_entry = {
658 .attr = {.name = "io_poll_delay", .mode = S_IRUGO | S_IWUSR },
659 .show = queue_poll_delay_show,
660 .store = queue_poll_delay_store,
663 static struct queue_sysfs_entry queue_wc_entry = {
664 .attr = {.name = "write_cache", .mode = S_IRUGO | S_IWUSR },
665 .show = queue_wc_show,
666 .store = queue_wc_store,
669 static struct queue_sysfs_entry queue_dax_entry = {
670 .attr = {.name = "dax", .mode = S_IRUGO },
671 .show = queue_dax_show,
674 static struct queue_sysfs_entry queue_wb_lat_entry = {
675 .attr = {.name = "wbt_lat_usec", .mode = S_IRUGO | S_IWUSR },
676 .show = queue_wb_lat_show,
677 .store = queue_wb_lat_store,
680 static struct attribute *default_attrs[] = {
681 &queue_requests_entry.attr,
682 &queue_ra_entry.attr,
683 &queue_max_hw_sectors_entry.attr,
684 &queue_max_sectors_entry.attr,
685 &queue_max_segments_entry.attr,
686 &queue_max_discard_segments_entry.attr,
687 &queue_max_integrity_segments_entry.attr,
688 &queue_max_segment_size_entry.attr,
689 &queue_iosched_entry.attr,
690 &queue_hw_sector_size_entry.attr,
691 &queue_logical_block_size_entry.attr,
692 &queue_physical_block_size_entry.attr,
693 &queue_chunk_sectors_entry.attr,
694 &queue_io_min_entry.attr,
695 &queue_io_opt_entry.attr,
696 &queue_discard_granularity_entry.attr,
697 &queue_discard_max_entry.attr,
698 &queue_discard_max_hw_entry.attr,
699 &queue_discard_zeroes_data_entry.attr,
700 &queue_write_same_max_entry.attr,
701 &queue_write_zeroes_max_entry.attr,
702 &queue_nonrot_entry.attr,
703 &queue_zoned_entry.attr,
704 &queue_nomerges_entry.attr,
705 &queue_rq_affinity_entry.attr,
706 &queue_iostats_entry.attr,
707 &queue_random_entry.attr,
708 &queue_poll_entry.attr,
709 &queue_wc_entry.attr,
710 &queue_dax_entry.attr,
711 &queue_wb_lat_entry.attr,
712 &queue_poll_delay_entry.attr,
716 #define to_queue(atr) container_of((atr), struct queue_sysfs_entry, attr)
719 queue_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
721 struct queue_sysfs_entry *entry = to_queue(attr);
722 struct request_queue *q =
723 container_of(kobj, struct request_queue, kobj);
728 mutex_lock(&q->sysfs_lock);
729 if (blk_queue_dying(q)) {
730 mutex_unlock(&q->sysfs_lock);
733 res = entry->show(q, page);
734 mutex_unlock(&q->sysfs_lock);
739 queue_attr_store(struct kobject *kobj, struct attribute *attr,
740 const char *page, size_t length)
742 struct queue_sysfs_entry *entry = to_queue(attr);
743 struct request_queue *q;
749 q = container_of(kobj, struct request_queue, kobj);
750 mutex_lock(&q->sysfs_lock);
751 if (blk_queue_dying(q)) {
752 mutex_unlock(&q->sysfs_lock);
755 res = entry->store(q, page, length);
756 mutex_unlock(&q->sysfs_lock);
760 static void blk_free_queue_rcu(struct rcu_head *rcu_head)
762 struct request_queue *q = container_of(rcu_head, struct request_queue,
764 kmem_cache_free(blk_requestq_cachep, q);
768 * blk_release_queue: - release a &struct request_queue when it is no longer needed
769 * @kobj: the kobj belonging to the request queue to be released
772 * blk_release_queue is the pair to blk_init_queue() or
773 * blk_queue_make_request(). It should be called when a request queue is
774 * being released; typically when a block device is being de-registered.
775 * Currently, its primary task it to free all the &struct request
776 * structures that were allocated to the queue and the queue itself.
779 * The low level driver must have finished any outstanding requests first
780 * via blk_cleanup_queue().
782 static void blk_release_queue(struct kobject *kobj)
784 struct request_queue *q =
785 container_of(kobj, struct request_queue, kobj);
788 if (test_bit(QUEUE_FLAG_POLL_STATS, &q->queue_flags))
789 blk_stat_remove_callback(q, q->poll_cb);
790 blk_stat_free_callback(q->poll_cb);
791 bdi_put(q->backing_dev_info);
796 elevator_exit(q->elevator);
799 blk_free_queue_stats(q->stats);
801 blk_exit_rl(&q->root_rl);
804 __blk_queue_free_tags(q);
808 q->exit_rq_fn(q, q->fq->flush_rq);
809 blk_free_flush_queue(q->fq);
814 blk_trace_shutdown(q);
817 blk_mq_debugfs_unregister(q);
820 bioset_free(q->bio_split);
822 ida_simple_remove(&blk_queue_ida, q->id);
823 call_rcu(&q->rcu_head, blk_free_queue_rcu);
826 static const struct sysfs_ops queue_sysfs_ops = {
827 .show = queue_attr_show,
828 .store = queue_attr_store,
831 struct kobj_type blk_queue_ktype = {
832 .sysfs_ops = &queue_sysfs_ops,
833 .default_attrs = default_attrs,
834 .release = blk_release_queue,
837 static void blk_wb_init(struct request_queue *q)
839 #ifndef CONFIG_BLK_WBT_MQ
843 #ifndef CONFIG_BLK_WBT_SQ
849 * If this fails, we don't get throttling
854 int blk_register_queue(struct gendisk *disk)
857 struct device *dev = disk_to_dev(disk);
858 struct request_queue *q = disk->queue;
864 * SCSI probing may synchronously create and destroy a lot of
865 * request_queues for non-existent devices. Shutting down a fully
866 * functional queue takes measureable wallclock time as RCU grace
867 * periods are involved. To avoid excessive latency in these
868 * cases, a request_queue starts out in a degraded mode which is
869 * faster to shut down and is made fully functional here as
870 * request_queues for non-existent devices never get registered.
872 if (!blk_queue_init_done(q)) {
873 queue_flag_set_unlocked(QUEUE_FLAG_INIT_DONE, q);
874 percpu_ref_switch_to_percpu(&q->q_usage_counter);
875 blk_queue_bypass_end(q);
878 ret = blk_trace_init_sysfs(dev);
883 blk_mq_register_dev(dev, q);
885 /* Prevent changes through sysfs until registration is completed. */
886 mutex_lock(&q->sysfs_lock);
888 ret = kobject_add(&q->kobj, kobject_get(&dev->kobj), "%s", "queue");
890 blk_trace_remove_sysfs(dev);
894 kobject_uevent(&q->kobj, KOBJ_ADD);
898 if (q->request_fn || (q->mq_ops && q->elevator)) {
899 ret = elv_register_queue(q);
901 kobject_uevent(&q->kobj, KOBJ_REMOVE);
902 kobject_del(&q->kobj);
903 blk_trace_remove_sysfs(dev);
904 kobject_put(&dev->kobj);
910 mutex_unlock(&q->sysfs_lock);
914 void blk_unregister_queue(struct gendisk *disk)
916 struct request_queue *q = disk->queue;
922 blk_mq_unregister_dev(disk_to_dev(disk), q);
924 if (q->request_fn || (q->mq_ops && q->elevator))
925 elv_unregister_queue(q);
927 kobject_uevent(&q->kobj, KOBJ_REMOVE);
928 kobject_del(&q->kobj);
929 blk_trace_remove_sysfs(disk_to_dev(disk));
930 kobject_put(&disk_to_dev(disk)->kobj);