1 // SPDX-License-Identifier: GPL-2.0
10 #include <linux/backing-dev.h>
15 #include "blk-mq.h"
16 #include "blk-mq-debugfs.h"
17 #include "blk-mq-sched.h"
18 #include "blk-rq-qos.h"
19 #include "blk-wbt.h"
20 #include "blk-cgroup.h"
21 #include "blk-throttle.h"
25 	ssize_t (*show)(struct gendisk *disk, char *page);
26 	ssize_t (*store)(struct gendisk *disk, const char *page, size_t count);
27 	int (*store_limit)(struct gendisk *disk, const char *page,
29 	void (*load_module)(struct gendisk *disk, const char *page, size_t count);
33 queue_var_show(unsigned long var, char *page)  in queue_var_show()  argument
35 	return sysfs_emit(page, "%lu\n", var);  in queue_var_show()
39 queue_var_store(unsigned long *var, const char *page, size_t count)  in queue_var_store()  argument
44 	err = kstrtoul(page, 10, &v);  in queue_var_store()
46 		return -EINVAL;  in queue_var_store()
53 static ssize_t queue_requests_show(struct gendisk *disk, char *page)  in queue_requests_show()  argument
55 	return queue_var_show(disk->queue->nr_requests, page);  in queue_requests_show()
59 queue_requests_store(struct gendisk *disk, const char *page, size_t count)  in queue_requests_store()  argument
64 	if (!queue_is_mq(disk->queue))  in queue_requests_store()
65 		return -EINVAL;  in queue_requests_store()
67 	ret = queue_var_store(&nr, page, count);  in queue_requests_store()
74 	err = blk_mq_update_nr_requests(disk->queue, nr);  in queue_requests_store()
81 static ssize_t queue_ra_show(struct gendisk *disk, char *page)  in queue_ra_show()  argument
83 	return queue_var_show(disk->bdi->ra_pages << (PAGE_SHIFT - 10), page);  in queue_ra_show()
87 queue_ra_store(struct gendisk *disk, const char *page, size_t count)  in queue_ra_store()  argument
92 	ret = queue_var_store(&ra_kb, page, count);  in queue_ra_store()
95 	disk->bdi->ra_pages = ra_kb >> (PAGE_SHIFT - 10);  in queue_ra_store()
100 static ssize_t queue_##_field##_show(struct gendisk *disk, char *page)	\
102 	return queue_var_show(disk->queue->limits._field, page);	\
124 static ssize_t queue_##_field##_show(struct gendisk *disk, char *page)	\  in QUEUE_SYSFS_LIMIT_SHOW()
126 	return sysfs_emit(page, "%llu\n",				\  in QUEUE_SYSFS_LIMIT_SHOW()
127 		(unsigned long long)disk->queue->limits._field <<	\  in QUEUE_SYSFS_LIMIT_SHOW()
139 static ssize_t queue_##_field##_show(struct gendisk *disk, char *page)	\
141 	return queue_var_show(disk->queue->limits._field >> 1, page);	\
148 static ssize_t queue_##_name##_show(struct gendisk *disk, char *page)	\
150 	return sysfs_emit(page, "%d\n", _val);				\
156 QUEUE_SYSFS_SHOW_CONST(poll_delay, -1)
159 		const char *page, size_t count, struct queue_limits *lim)
164 	ret = queue_var_store(&max_discard_bytes, page, count);
168 	if (max_discard_bytes & (disk->queue->limits.discard_granularity - 1))
169 		return -EINVAL;
172 		return -EINVAL;
174 	lim->max_user_discard_sectors = max_discard_bytes >> SECTOR_SHIFT;
179 queue_max_sectors_store(struct gendisk *disk, const char *page, size_t count,  in queue_max_sectors_store()  argument
185 	ret = queue_var_store(&max_sectors_kb, page, count);  in queue_max_sectors_store()
189 	lim->max_user_sectors = max_sectors_kb << 1;  in queue_max_sectors_store()
193 static ssize_t queue_feature_store(struct gendisk *disk, const char *page,  in queue_feature_store()  argument
199 	ret = queue_var_store(&val, page, count);  in queue_feature_store()
204 		lim->features |= feature;  in queue_feature_store()
206 		lim->features &= ~feature;  in queue_feature_store()
211 static ssize_t queue_##_name##_show(struct gendisk *disk, char *page)	\
213 	return sysfs_emit(page, "%u\n",					\
214 		!!(disk->queue->limits.features & _feature));		\
217 		const char *page, size_t count, struct queue_limits *lim) \
219 	return queue_feature_store(disk, page, count, lim, _feature);	\
228 static ssize_t queue_##_name##_show(struct gendisk *disk, char *page)	\
230 	return sysfs_emit(page, "%u\n",					\
231 		!!(disk->queue->limits.features & _feature));		\
237 static ssize_t queue_poll_show(struct gendisk *disk, char *page)  in queue_poll_show()  argument
239 	if (queue_is_mq(disk->queue))  in queue_poll_show()
240 		return sysfs_emit(page, "%u\n", blk_mq_can_poll(disk->queue));  in queue_poll_show()
241 	return sysfs_emit(page, "%u\n",  in queue_poll_show()
242 		!!(disk->queue->limits.features & BLK_FEAT_POLL));  in queue_poll_show()
245 static ssize_t queue_zoned_show(struct gendisk *disk, char *page)  in queue_zoned_show()  argument
247 	if (blk_queue_is_zoned(disk->queue))  in queue_zoned_show()
248 		return sysfs_emit(page, "host-managed\n");  in queue_zoned_show()
249 	return sysfs_emit(page, "none\n");  in queue_zoned_show()
252 static ssize_t queue_nr_zones_show(struct gendisk *disk, char *page)  in queue_nr_zones_show()  argument
254 	return queue_var_show(disk_nr_zones(disk), page);  in queue_nr_zones_show()
257 static ssize_t queue_iostats_passthrough_show(struct gendisk *disk, char *page)  in queue_iostats_passthrough_show()  argument
259 	return queue_var_show(!!blk_queue_passthrough_stat(disk->queue), page);  in queue_iostats_passthrough_show()
263 		const char *page, size_t count, struct queue_limits *lim)  in queue_iostats_passthrough_store()  argument
268 	ret = queue_var_store(&ios, page, count);  in queue_iostats_passthrough_store()
273 		lim->flags |= BLK_FLAG_IOSTATS_PASSTHROUGH;  in queue_iostats_passthrough_store()
275 		lim->flags &= ~BLK_FLAG_IOSTATS_PASSTHROUGH;  in queue_iostats_passthrough_store()
279 static ssize_t queue_nomerges_show(struct gendisk *disk, char *page)  in queue_nomerges_show()  argument
281 	return queue_var_show((blk_queue_nomerges(disk->queue) << 1) |  in queue_nomerges_show()
282 			       blk_queue_noxmerges(disk->queue), page);  in queue_nomerges_show()
285 static ssize_t queue_nomerges_store(struct gendisk *disk, const char *page,  in queue_nomerges_store()  argument
289 	ssize_t ret = queue_var_store(&nm, page, count);  in queue_nomerges_store()
294 	blk_queue_flag_clear(QUEUE_FLAG_NOMERGES, disk->queue);  in queue_nomerges_store()
295 	blk_queue_flag_clear(QUEUE_FLAG_NOXMERGES, disk->queue);  in queue_nomerges_store()
297 		blk_queue_flag_set(QUEUE_FLAG_NOMERGES, disk->queue);  in queue_nomerges_store()
299 		blk_queue_flag_set(QUEUE_FLAG_NOXMERGES, disk->queue);  in queue_nomerges_store()
304 static ssize_t queue_rq_affinity_show(struct gendisk *disk, char *page)  in queue_rq_affinity_show()  argument
306 	bool set = test_bit(QUEUE_FLAG_SAME_COMP, &disk->queue->queue_flags);  in queue_rq_affinity_show()
307 	bool force = test_bit(QUEUE_FLAG_SAME_FORCE, &disk->queue->queue_flags);  in queue_rq_affinity_show()
309 	return queue_var_show(set << force, page);  in queue_rq_affinity_show()
313 queue_rq_affinity_store(struct gendisk *disk, const char *page, size_t count)  in queue_rq_affinity_store()  argument
315 	ssize_t ret = -EINVAL;  in queue_rq_affinity_store()
317 	struct request_queue *q = disk->queue;  in queue_rq_affinity_store()
320 	ret = queue_var_store(&val, page, count);  in queue_rq_affinity_store()
338 static ssize_t queue_poll_delay_store(struct gendisk *disk, const char *page,  in queue_poll_delay_store()  argument
344 static ssize_t queue_poll_store(struct gendisk *disk, const char *page,  in queue_poll_store()  argument
347 	if (!(disk->queue->limits.features & BLK_FEAT_POLL))  in queue_poll_store()
348 		return -EINVAL;  in queue_poll_store()
354 static ssize_t queue_io_timeout_show(struct gendisk *disk, char *page)  in queue_io_timeout_show()  argument
356 	return sysfs_emit(page, "%u\n", jiffies_to_msecs(disk->queue->rq_timeout));  in queue_io_timeout_show()
359 static ssize_t queue_io_timeout_store(struct gendisk *disk, const char *page,  in queue_io_timeout_store()  argument
365 	err = kstrtou32(page, 10, &val);  in queue_io_timeout_store()
367 		return -EINVAL;  in queue_io_timeout_store()
369 	blk_queue_rq_timeout(disk->queue, msecs_to_jiffies(val));  in queue_io_timeout_store()
374 static ssize_t queue_wc_show(struct gendisk *disk, char *page)  in queue_wc_show()  argument
376 	if (blk_queue_write_cache(disk->queue))  in queue_wc_show()
377 		return sysfs_emit(page, "write back\n");  in queue_wc_show()
378 	return sysfs_emit(page, "write through\n");  in queue_wc_show()
381 static int queue_wc_store(struct gendisk *disk, const char *page,  in queue_wc_store()  argument
386 	if (!strncmp(page, "write back", 10)) {  in queue_wc_store()
388 	} else if (!strncmp(page, "write through", 13) ||  in queue_wc_store()
389 		   !strncmp(page, "none", 4)) {  in queue_wc_store()
392 		return -EINVAL;  in queue_wc_store()
396 		lim->flags |= BLK_FLAG_WRITE_CACHE_DISABLED;  in queue_wc_store()
398 		lim->flags &= ~BLK_FLAG_WRITE_CACHE_DISABLED;  in queue_wc_store()
491 static ssize_t queue_var_store64(s64 *var, const char *page)  in queue_var_store64()  argument
496 	err = kstrtos64(page, 10, &v);  in queue_var_store64()
504 static ssize_t queue_wb_lat_show(struct gendisk *disk, char *page)  in queue_wb_lat_show()  argument
506 	if (!wbt_rq_qos(disk->queue))  in queue_wb_lat_show()
507 		return -EINVAL;  in queue_wb_lat_show()
509 	if (wbt_disabled(disk->queue))  in queue_wb_lat_show()
510 		return sysfs_emit(page, "0\n");  in queue_wb_lat_show()
512 	return sysfs_emit(page, "%llu\n",  in queue_wb_lat_show()
513 		div_u64(wbt_get_min_lat(disk->queue), 1000));  in queue_wb_lat_show()
516 static ssize_t queue_wb_lat_store(struct gendisk *disk, const char *page,  in queue_wb_lat_store()  argument
519 	struct request_queue *q = disk->queue;  in queue_wb_lat_store()
524 	ret = queue_var_store64(&val, page);  in queue_wb_lat_store()
527 	if (val < -1)  in queue_wb_lat_store()
528 		return -EINVAL;  in queue_wb_lat_store()
537 	if (val == -1)  in queue_wb_lat_store()
562 /* Common attributes for bio-based and request-based queues. */
609 /* Request-based queue attributes that are not relevant for bio-based queues. */
625 	struct request_queue *q = disk->queue;  in queue_attr_visible()
632 	return attr->mode;  in queue_attr_visible()
639 	struct request_queue *q = disk->queue;  in blk_mq_queue_attr_visible()
644 	if (attr == &queue_io_timeout_entry.attr && !q->mq_ops->timeout)  in blk_mq_queue_attr_visible()
647 	return attr->mode;  in blk_mq_queue_attr_visible()
663 queue_attr_show(struct kobject *kobj, struct attribute *attr, char *page)  in queue_attr_show()  argument
669 	if (!entry->show)  in queue_attr_show()
670 		return -EIO;  in queue_attr_show()
671 	mutex_lock(&disk->queue->sysfs_lock);  in queue_attr_show()
672 	res = entry->show(disk, page);  in queue_attr_show()
673 	mutex_unlock(&disk->queue->sysfs_lock);  in queue_attr_show()
679 		    const char *page, size_t length)  in queue_attr_store()  argument
683 	struct request_queue *q = disk->queue;  in queue_attr_store()
687 	if (!entry->store_limit && !entry->store)  in queue_attr_store()
688 		return -EIO;  in queue_attr_store()
695 	if (entry->load_module)  in queue_attr_store()
696 		entry->load_module(disk, page, length);  in queue_attr_store()
698 	if (entry->store_limit) {  in queue_attr_store()
701 		res = entry->store_limit(disk, page, length, &lim);  in queue_attr_store()
713 	mutex_lock(&q->sysfs_lock);  in queue_attr_store()
715 	res = entry->store(disk, page, length);  in queue_attr_store()
717 	mutex_unlock(&q->sysfs_lock);  in queue_attr_store()
745 	struct request_queue *q = disk->queue;  in blk_debugfs_remove()
747 	mutex_lock(&q->debugfs_mutex);  in blk_debugfs_remove()
749 	debugfs_remove_recursive(q->debugfs_dir);  in blk_debugfs_remove()
750 	q->debugfs_dir = NULL;  in blk_debugfs_remove()
751 	q->sched_debugfs_dir = NULL;  in blk_debugfs_remove()
752 	q->rqos_debugfs_dir = NULL;  in blk_debugfs_remove()
753 	mutex_unlock(&q->debugfs_mutex);  in blk_debugfs_remove()
757  * blk_register_queue - register a block layer queue with sysfs
762 	struct request_queue *q = disk->queue;  in blk_register_queue()
765 	kobject_init(&disk->queue_kobj, &blk_queue_ktype);  in blk_register_queue()
766 	ret = kobject_add(&disk->queue_kobj, &disk_to_dev(disk)->kobj, "queue");  in blk_register_queue()
775 	mutex_lock(&q->sysfs_lock);  in blk_register_queue()
777 	mutex_lock(&q->debugfs_mutex);  in blk_register_queue()
778 	q->debugfs_dir = debugfs_create_dir(disk->disk_name, blk_debugfs_root);  in blk_register_queue()
781 	mutex_unlock(&q->debugfs_mutex);  in blk_register_queue()
787 	if (q->elevator) {  in blk_register_queue()
801 	kobject_uevent(&disk->queue_kobj, KOBJ_ADD);  in blk_register_queue()
802 	if (q->elevator)  in blk_register_queue()
803 		kobject_uevent(&q->elevator->kobj, KOBJ_ADD);  in blk_register_queue()
804 	mutex_unlock(&q->sysfs_lock);  in blk_register_queue()
808 	 * request_queues for non-existent devices.  Shutting down a fully  in blk_register_queue()
813 	 * request_queues for non-existent devices never get registered.  in blk_register_queue()
816 	percpu_ref_switch_to_percpu(&q->q_usage_counter);  in blk_register_queue()
826 	mutex_unlock(&q->sysfs_lock);  in blk_register_queue()
830 	kobject_put(&disk->queue_kobj);  in blk_register_queue()
835  * blk_unregister_queue - counterpart of blk_register_queue()
843 	struct request_queue *q = disk->queue;  in blk_unregister_queue()
848 	/* Return early if disk->queue was never registered. */  in blk_unregister_queue()
857 	mutex_lock(&q->sysfs_lock);  in blk_unregister_queue()
859 	mutex_unlock(&q->sysfs_lock);  in blk_unregister_queue()
869 	mutex_lock(&q->sysfs_lock);  in blk_unregister_queue()
872 	mutex_unlock(&q->sysfs_lock);  in blk_unregister_queue()
875 	kobject_uevent(&disk->queue_kobj, KOBJ_REMOVE);  in blk_unregister_queue()
876 	kobject_del(&disk->queue_kobj);  in blk_unregister_queue()