1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (C) 2017 Facebook
6 #include <linux/kernel.h>
7 #include <linux/blkdev.h>
8 #include <linux/debugfs.h>
10 #include <linux/blk-mq.h>
13 #include "blk-mq-debugfs.h"
14 #include "blk-mq-tag.h"
15 #include "blk-rq-qos.h"
17 static void print_stat(struct seq_file *m, struct blk_rq_stat *stat)
19 if (stat->nr_samples) {
20 seq_printf(m, "samples=%d, mean=%llu, min=%llu, max=%llu",
21 stat->nr_samples, stat->mean, stat->min, stat->max);
23 seq_puts(m, "samples=0");
27 static int queue_poll_stat_show(void *data, struct seq_file *m)
29 struct request_queue *q = data;
32 for (bucket = 0; bucket < (BLK_MQ_POLL_STATS_BKTS / 2); bucket++) {
33 seq_printf(m, "read (%d Bytes): ", 1 << (9 + bucket));
34 print_stat(m, &q->poll_stat[2 * bucket]);
37 seq_printf(m, "write (%d Bytes): ", 1 << (9 + bucket));
38 print_stat(m, &q->poll_stat[2 * bucket + 1]);
44 static void *queue_requeue_list_start(struct seq_file *m, loff_t *pos)
45 __acquires(&q->requeue_lock)
47 struct request_queue *q = m->private;
49 spin_lock_irq(&q->requeue_lock);
50 return seq_list_start(&q->requeue_list, *pos);
53 static void *queue_requeue_list_next(struct seq_file *m, void *v, loff_t *pos)
55 struct request_queue *q = m->private;
57 return seq_list_next(v, &q->requeue_list, pos);
60 static void queue_requeue_list_stop(struct seq_file *m, void *v)
61 __releases(&q->requeue_lock)
63 struct request_queue *q = m->private;
65 spin_unlock_irq(&q->requeue_lock);
68 static const struct seq_operations queue_requeue_list_seq_ops = {
69 .start = queue_requeue_list_start,
70 .next = queue_requeue_list_next,
71 .stop = queue_requeue_list_stop,
72 .show = blk_mq_debugfs_rq_show,
75 static int blk_flags_show(struct seq_file *m, const unsigned long flags,
76 const char *const *flag_name, int flag_name_count)
81 for (i = 0; i < sizeof(flags) * BITS_PER_BYTE; i++) {
82 if (!(flags & BIT(i)))
87 if (i < flag_name_count && flag_name[i])
88 seq_puts(m, flag_name[i]);
90 seq_printf(m, "%d", i);
95 static int queue_pm_only_show(void *data, struct seq_file *m)
97 struct request_queue *q = data;
99 seq_printf(m, "%d\n", atomic_read(&q->pm_only));
103 #define QUEUE_FLAG_NAME(name) [QUEUE_FLAG_##name] = #name
104 static const char *const blk_queue_flag_name[] = {
105 QUEUE_FLAG_NAME(STOPPED),
106 QUEUE_FLAG_NAME(DYING),
107 QUEUE_FLAG_NAME(NOMERGES),
108 QUEUE_FLAG_NAME(SAME_COMP),
109 QUEUE_FLAG_NAME(FAIL_IO),
110 QUEUE_FLAG_NAME(NONROT),
111 QUEUE_FLAG_NAME(IO_STAT),
112 QUEUE_FLAG_NAME(DISCARD),
113 QUEUE_FLAG_NAME(NOXMERGES),
114 QUEUE_FLAG_NAME(ADD_RANDOM),
115 QUEUE_FLAG_NAME(SECERASE),
116 QUEUE_FLAG_NAME(SAME_FORCE),
117 QUEUE_FLAG_NAME(DEAD),
118 QUEUE_FLAG_NAME(INIT_DONE),
119 QUEUE_FLAG_NAME(STABLE_WRITES),
120 QUEUE_FLAG_NAME(POLL),
122 QUEUE_FLAG_NAME(FUA),
123 QUEUE_FLAG_NAME(DAX),
124 QUEUE_FLAG_NAME(STATS),
125 QUEUE_FLAG_NAME(POLL_STATS),
126 QUEUE_FLAG_NAME(REGISTERED),
127 QUEUE_FLAG_NAME(QUIESCED),
128 QUEUE_FLAG_NAME(PCI_P2PDMA),
129 QUEUE_FLAG_NAME(ZONE_RESETALL),
130 QUEUE_FLAG_NAME(RQ_ALLOC_TIME),
131 QUEUE_FLAG_NAME(HCTX_ACTIVE),
132 QUEUE_FLAG_NAME(NOWAIT),
134 #undef QUEUE_FLAG_NAME
136 static int queue_state_show(void *data, struct seq_file *m)
138 struct request_queue *q = data;
140 blk_flags_show(m, q->queue_flags, blk_queue_flag_name,
141 ARRAY_SIZE(blk_queue_flag_name));
146 static ssize_t queue_state_write(void *data, const char __user *buf,
147 size_t count, loff_t *ppos)
149 struct request_queue *q = data;
150 char opbuf[16] = { }, *op;
153 * The "state" attribute is removed after blk_cleanup_queue() has called
154 * blk_mq_free_queue(). Return if QUEUE_FLAG_DEAD has been set to avoid
155 * triggering a use-after-free.
157 if (blk_queue_dead(q))
160 if (count >= sizeof(opbuf)) {
161 pr_err("%s: operation too long\n", __func__);
165 if (copy_from_user(opbuf, buf, count))
167 op = strstrip(opbuf);
168 if (strcmp(op, "run") == 0) {
169 blk_mq_run_hw_queues(q, true);
170 } else if (strcmp(op, "start") == 0) {
171 blk_mq_start_stopped_hw_queues(q, true);
172 } else if (strcmp(op, "kick") == 0) {
173 blk_mq_kick_requeue_list(q);
175 pr_err("%s: unsupported operation '%s'\n", __func__, op);
177 pr_err("%s: use 'run', 'start' or 'kick'\n", __func__);
183 static int queue_write_hint_show(void *data, struct seq_file *m)
185 struct request_queue *q = data;
188 for (i = 0; i < BLK_MAX_WRITE_HINTS; i++)
189 seq_printf(m, "hint%d: %llu\n", i, q->write_hints[i]);
194 static ssize_t queue_write_hint_store(void *data, const char __user *buf,
195 size_t count, loff_t *ppos)
197 struct request_queue *q = data;
200 for (i = 0; i < BLK_MAX_WRITE_HINTS; i++)
201 q->write_hints[i] = 0;
206 static const struct blk_mq_debugfs_attr blk_mq_debugfs_queue_attrs[] = {
207 { "poll_stat", 0400, queue_poll_stat_show },
208 { "requeue_list", 0400, .seq_ops = &queue_requeue_list_seq_ops },
209 { "pm_only", 0600, queue_pm_only_show, NULL },
210 { "state", 0600, queue_state_show, queue_state_write },
211 { "write_hints", 0600, queue_write_hint_show, queue_write_hint_store },
212 { "zone_wlock", 0400, queue_zone_wlock_show, NULL },
216 #define HCTX_STATE_NAME(name) [BLK_MQ_S_##name] = #name
217 static const char *const hctx_state_name[] = {
218 HCTX_STATE_NAME(STOPPED),
219 HCTX_STATE_NAME(TAG_ACTIVE),
220 HCTX_STATE_NAME(SCHED_RESTART),
221 HCTX_STATE_NAME(INACTIVE),
223 #undef HCTX_STATE_NAME
225 static int hctx_state_show(void *data, struct seq_file *m)
227 struct blk_mq_hw_ctx *hctx = data;
229 blk_flags_show(m, hctx->state, hctx_state_name,
230 ARRAY_SIZE(hctx_state_name));
235 #define BLK_TAG_ALLOC_NAME(name) [BLK_TAG_ALLOC_##name] = #name
236 static const char *const alloc_policy_name[] = {
237 BLK_TAG_ALLOC_NAME(FIFO),
238 BLK_TAG_ALLOC_NAME(RR),
240 #undef BLK_TAG_ALLOC_NAME
242 #define HCTX_FLAG_NAME(name) [ilog2(BLK_MQ_F_##name)] = #name
243 static const char *const hctx_flag_name[] = {
244 HCTX_FLAG_NAME(SHOULD_MERGE),
245 HCTX_FLAG_NAME(TAG_QUEUE_SHARED),
246 HCTX_FLAG_NAME(BLOCKING),
247 HCTX_FLAG_NAME(NO_SCHED),
248 HCTX_FLAG_NAME(STACKING),
249 HCTX_FLAG_NAME(TAG_HCTX_SHARED),
251 #undef HCTX_FLAG_NAME
253 static int hctx_flags_show(void *data, struct seq_file *m)
255 struct blk_mq_hw_ctx *hctx = data;
256 const int alloc_policy = BLK_MQ_FLAG_TO_ALLOC_POLICY(hctx->flags);
258 seq_puts(m, "alloc_policy=");
259 if (alloc_policy < ARRAY_SIZE(alloc_policy_name) &&
260 alloc_policy_name[alloc_policy])
261 seq_puts(m, alloc_policy_name[alloc_policy]);
263 seq_printf(m, "%d", alloc_policy);
266 hctx->flags ^ BLK_ALLOC_POLICY_TO_MQ_FLAG(alloc_policy),
267 hctx_flag_name, ARRAY_SIZE(hctx_flag_name));
272 #define CMD_FLAG_NAME(name) [__REQ_##name] = #name
273 static const char *const cmd_flag_name[] = {
274 CMD_FLAG_NAME(FAILFAST_DEV),
275 CMD_FLAG_NAME(FAILFAST_TRANSPORT),
276 CMD_FLAG_NAME(FAILFAST_DRIVER),
280 CMD_FLAG_NAME(NOMERGE),
282 CMD_FLAG_NAME(INTEGRITY),
284 CMD_FLAG_NAME(PREFLUSH),
285 CMD_FLAG_NAME(RAHEAD),
286 CMD_FLAG_NAME(BACKGROUND),
287 CMD_FLAG_NAME(NOWAIT),
288 CMD_FLAG_NAME(NOUNMAP),
289 CMD_FLAG_NAME(POLLED),
293 #define RQF_NAME(name) [ilog2((__force u32)RQF_##name)] = #name
294 static const char *const rqf_name[] = {
296 RQF_NAME(SOFTBARRIER),
298 RQF_NAME(MIXED_MERGE),
299 RQF_NAME(MQ_INFLIGHT),
308 RQF_NAME(SPECIAL_PAYLOAD),
309 RQF_NAME(ZONE_WRITE_LOCKED),
310 RQF_NAME(MQ_POLL_SLEPT),
315 static const char *const blk_mq_rq_state_name_array[] = {
316 [MQ_RQ_IDLE] = "idle",
317 [MQ_RQ_IN_FLIGHT] = "in_flight",
318 [MQ_RQ_COMPLETE] = "complete",
321 static const char *blk_mq_rq_state_name(enum mq_rq_state rq_state)
323 if (WARN_ON_ONCE((unsigned int)rq_state >=
324 ARRAY_SIZE(blk_mq_rq_state_name_array)))
326 return blk_mq_rq_state_name_array[rq_state];
329 int __blk_mq_debugfs_rq_show(struct seq_file *m, struct request *rq)
331 const struct blk_mq_ops *const mq_ops = rq->q->mq_ops;
332 const unsigned int op = req_op(rq);
333 const char *op_str = blk_op_str(op);
335 seq_printf(m, "%p {.op=", rq);
336 if (strcmp(op_str, "UNKNOWN") == 0)
337 seq_printf(m, "%u", op);
339 seq_printf(m, "%s", op_str);
340 seq_puts(m, ", .cmd_flags=");
341 blk_flags_show(m, rq->cmd_flags & ~REQ_OP_MASK, cmd_flag_name,
342 ARRAY_SIZE(cmd_flag_name));
343 seq_puts(m, ", .rq_flags=");
344 blk_flags_show(m, (__force unsigned int)rq->rq_flags, rqf_name,
345 ARRAY_SIZE(rqf_name));
346 seq_printf(m, ", .state=%s", blk_mq_rq_state_name(blk_mq_rq_state(rq)));
347 seq_printf(m, ", .tag=%d, .internal_tag=%d", rq->tag,
350 mq_ops->show_rq(m, rq);
354 EXPORT_SYMBOL_GPL(__blk_mq_debugfs_rq_show);
356 int blk_mq_debugfs_rq_show(struct seq_file *m, void *v)
358 return __blk_mq_debugfs_rq_show(m, list_entry_rq(v));
360 EXPORT_SYMBOL_GPL(blk_mq_debugfs_rq_show);
362 static void *hctx_dispatch_start(struct seq_file *m, loff_t *pos)
363 __acquires(&hctx->lock)
365 struct blk_mq_hw_ctx *hctx = m->private;
367 spin_lock(&hctx->lock);
368 return seq_list_start(&hctx->dispatch, *pos);
371 static void *hctx_dispatch_next(struct seq_file *m, void *v, loff_t *pos)
373 struct blk_mq_hw_ctx *hctx = m->private;
375 return seq_list_next(v, &hctx->dispatch, pos);
378 static void hctx_dispatch_stop(struct seq_file *m, void *v)
379 __releases(&hctx->lock)
381 struct blk_mq_hw_ctx *hctx = m->private;
383 spin_unlock(&hctx->lock);
386 static const struct seq_operations hctx_dispatch_seq_ops = {
387 .start = hctx_dispatch_start,
388 .next = hctx_dispatch_next,
389 .stop = hctx_dispatch_stop,
390 .show = blk_mq_debugfs_rq_show,
393 struct show_busy_params {
395 struct blk_mq_hw_ctx *hctx;
399 * Note: the state of a request may change while this function is in progress,
400 * e.g. due to a concurrent blk_mq_finish_request() call. Returns true to
401 * keep iterating requests.
403 static bool hctx_show_busy_rq(struct request *rq, void *data, bool reserved)
405 const struct show_busy_params *params = data;
407 if (rq->mq_hctx == params->hctx)
408 __blk_mq_debugfs_rq_show(params->m, rq);
413 static int hctx_busy_show(void *data, struct seq_file *m)
415 struct blk_mq_hw_ctx *hctx = data;
416 struct show_busy_params params = { .m = m, .hctx = hctx };
418 blk_mq_tagset_busy_iter(hctx->queue->tag_set, hctx_show_busy_rq,
424 static const char *const hctx_types[] = {
425 [HCTX_TYPE_DEFAULT] = "default",
426 [HCTX_TYPE_READ] = "read",
427 [HCTX_TYPE_POLL] = "poll",
430 static int hctx_type_show(void *data, struct seq_file *m)
432 struct blk_mq_hw_ctx *hctx = data;
434 BUILD_BUG_ON(ARRAY_SIZE(hctx_types) != HCTX_MAX_TYPES);
435 seq_printf(m, "%s\n", hctx_types[hctx->type]);
439 static int hctx_ctx_map_show(void *data, struct seq_file *m)
441 struct blk_mq_hw_ctx *hctx = data;
443 sbitmap_bitmap_show(&hctx->ctx_map, m);
447 static void blk_mq_debugfs_tags_show(struct seq_file *m,
448 struct blk_mq_tags *tags)
450 seq_printf(m, "nr_tags=%u\n", tags->nr_tags);
451 seq_printf(m, "nr_reserved_tags=%u\n", tags->nr_reserved_tags);
452 seq_printf(m, "active_queues=%d\n",
453 atomic_read(&tags->active_queues));
455 seq_puts(m, "\nbitmap_tags:\n");
456 sbitmap_queue_show(&tags->bitmap_tags, m);
458 if (tags->nr_reserved_tags) {
459 seq_puts(m, "\nbreserved_tags:\n");
460 sbitmap_queue_show(&tags->breserved_tags, m);
464 static int hctx_tags_show(void *data, struct seq_file *m)
466 struct blk_mq_hw_ctx *hctx = data;
467 struct request_queue *q = hctx->queue;
470 res = mutex_lock_interruptible(&q->sysfs_lock);
474 blk_mq_debugfs_tags_show(m, hctx->tags);
475 mutex_unlock(&q->sysfs_lock);
481 static int hctx_tags_bitmap_show(void *data, struct seq_file *m)
483 struct blk_mq_hw_ctx *hctx = data;
484 struct request_queue *q = hctx->queue;
487 res = mutex_lock_interruptible(&q->sysfs_lock);
491 sbitmap_bitmap_show(&hctx->tags->bitmap_tags.sb, m);
492 mutex_unlock(&q->sysfs_lock);
498 static int hctx_sched_tags_show(void *data, struct seq_file *m)
500 struct blk_mq_hw_ctx *hctx = data;
501 struct request_queue *q = hctx->queue;
504 res = mutex_lock_interruptible(&q->sysfs_lock);
507 if (hctx->sched_tags)
508 blk_mq_debugfs_tags_show(m, hctx->sched_tags);
509 mutex_unlock(&q->sysfs_lock);
515 static int hctx_sched_tags_bitmap_show(void *data, struct seq_file *m)
517 struct blk_mq_hw_ctx *hctx = data;
518 struct request_queue *q = hctx->queue;
521 res = mutex_lock_interruptible(&q->sysfs_lock);
524 if (hctx->sched_tags)
525 sbitmap_bitmap_show(&hctx->sched_tags->bitmap_tags.sb, m);
526 mutex_unlock(&q->sysfs_lock);
532 static int hctx_run_show(void *data, struct seq_file *m)
534 struct blk_mq_hw_ctx *hctx = data;
536 seq_printf(m, "%lu\n", hctx->run);
540 static ssize_t hctx_run_write(void *data, const char __user *buf, size_t count,
543 struct blk_mq_hw_ctx *hctx = data;
549 static int hctx_active_show(void *data, struct seq_file *m)
551 struct blk_mq_hw_ctx *hctx = data;
553 seq_printf(m, "%d\n", __blk_mq_active_requests(hctx));
557 static int hctx_dispatch_busy_show(void *data, struct seq_file *m)
559 struct blk_mq_hw_ctx *hctx = data;
561 seq_printf(m, "%u\n", hctx->dispatch_busy);
565 #define CTX_RQ_SEQ_OPS(name, type) \
566 static void *ctx_##name##_rq_list_start(struct seq_file *m, loff_t *pos) \
567 __acquires(&ctx->lock) \
569 struct blk_mq_ctx *ctx = m->private; \
571 spin_lock(&ctx->lock); \
572 return seq_list_start(&ctx->rq_lists[type], *pos); \
575 static void *ctx_##name##_rq_list_next(struct seq_file *m, void *v, \
578 struct blk_mq_ctx *ctx = m->private; \
580 return seq_list_next(v, &ctx->rq_lists[type], pos); \
583 static void ctx_##name##_rq_list_stop(struct seq_file *m, void *v) \
584 __releases(&ctx->lock) \
586 struct blk_mq_ctx *ctx = m->private; \
588 spin_unlock(&ctx->lock); \
591 static const struct seq_operations ctx_##name##_rq_list_seq_ops = { \
592 .start = ctx_##name##_rq_list_start, \
593 .next = ctx_##name##_rq_list_next, \
594 .stop = ctx_##name##_rq_list_stop, \
595 .show = blk_mq_debugfs_rq_show, \
598 CTX_RQ_SEQ_OPS(default, HCTX_TYPE_DEFAULT);
599 CTX_RQ_SEQ_OPS(read, HCTX_TYPE_READ);
600 CTX_RQ_SEQ_OPS(poll, HCTX_TYPE_POLL);
602 static int blk_mq_debugfs_show(struct seq_file *m, void *v)
604 const struct blk_mq_debugfs_attr *attr = m->private;
605 void *data = d_inode(m->file->f_path.dentry->d_parent)->i_private;
607 return attr->show(data, m);
610 static ssize_t blk_mq_debugfs_write(struct file *file, const char __user *buf,
611 size_t count, loff_t *ppos)
613 struct seq_file *m = file->private_data;
614 const struct blk_mq_debugfs_attr *attr = m->private;
615 void *data = d_inode(file->f_path.dentry->d_parent)->i_private;
618 * Attributes that only implement .seq_ops are read-only and 'attr' is
619 * the same with 'data' in this case.
621 if (attr == data || !attr->write)
624 return attr->write(data, buf, count, ppos);
627 static int blk_mq_debugfs_open(struct inode *inode, struct file *file)
629 const struct blk_mq_debugfs_attr *attr = inode->i_private;
630 void *data = d_inode(file->f_path.dentry->d_parent)->i_private;
635 ret = seq_open(file, attr->seq_ops);
637 m = file->private_data;
643 if (WARN_ON_ONCE(!attr->show))
646 return single_open(file, blk_mq_debugfs_show, inode->i_private);
649 static int blk_mq_debugfs_release(struct inode *inode, struct file *file)
651 const struct blk_mq_debugfs_attr *attr = inode->i_private;
654 return single_release(inode, file);
656 return seq_release(inode, file);
659 static const struct file_operations blk_mq_debugfs_fops = {
660 .open = blk_mq_debugfs_open,
662 .write = blk_mq_debugfs_write,
664 .release = blk_mq_debugfs_release,
667 static const struct blk_mq_debugfs_attr blk_mq_debugfs_hctx_attrs[] = {
668 {"state", 0400, hctx_state_show},
669 {"flags", 0400, hctx_flags_show},
670 {"dispatch", 0400, .seq_ops = &hctx_dispatch_seq_ops},
671 {"busy", 0400, hctx_busy_show},
672 {"ctx_map", 0400, hctx_ctx_map_show},
673 {"tags", 0400, hctx_tags_show},
674 {"tags_bitmap", 0400, hctx_tags_bitmap_show},
675 {"sched_tags", 0400, hctx_sched_tags_show},
676 {"sched_tags_bitmap", 0400, hctx_sched_tags_bitmap_show},
677 {"run", 0600, hctx_run_show, hctx_run_write},
678 {"active", 0400, hctx_active_show},
679 {"dispatch_busy", 0400, hctx_dispatch_busy_show},
680 {"type", 0400, hctx_type_show},
684 static const struct blk_mq_debugfs_attr blk_mq_debugfs_ctx_attrs[] = {
685 {"default_rq_list", 0400, .seq_ops = &ctx_default_rq_list_seq_ops},
686 {"read_rq_list", 0400, .seq_ops = &ctx_read_rq_list_seq_ops},
687 {"poll_rq_list", 0400, .seq_ops = &ctx_poll_rq_list_seq_ops},
691 static void debugfs_create_files(struct dentry *parent, void *data,
692 const struct blk_mq_debugfs_attr *attr)
694 if (IS_ERR_OR_NULL(parent))
697 d_inode(parent)->i_private = data;
699 for (; attr->name; attr++)
700 debugfs_create_file(attr->name, attr->mode, parent,
701 (void *)attr, &blk_mq_debugfs_fops);
704 void blk_mq_debugfs_register(struct request_queue *q)
706 struct blk_mq_hw_ctx *hctx;
709 debugfs_create_files(q->debugfs_dir, q, blk_mq_debugfs_queue_attrs);
712 * blk_mq_init_sched() attempted to do this already, but q->debugfs_dir
713 * didn't exist yet (because we don't know what to name the directory
714 * until the queue is registered to a gendisk).
716 if (q->elevator && !q->sched_debugfs_dir)
717 blk_mq_debugfs_register_sched(q);
719 /* Similarly, blk_mq_init_hctx() couldn't do this previously. */
720 queue_for_each_hw_ctx(q, hctx, i) {
721 if (!hctx->debugfs_dir)
722 blk_mq_debugfs_register_hctx(q, hctx);
723 if (q->elevator && !hctx->sched_debugfs_dir)
724 blk_mq_debugfs_register_sched_hctx(q, hctx);
728 struct rq_qos *rqos = q->rq_qos;
731 blk_mq_debugfs_register_rqos(rqos);
737 void blk_mq_debugfs_unregister(struct request_queue *q)
739 q->sched_debugfs_dir = NULL;
742 static void blk_mq_debugfs_register_ctx(struct blk_mq_hw_ctx *hctx,
743 struct blk_mq_ctx *ctx)
745 struct dentry *ctx_dir;
748 snprintf(name, sizeof(name), "cpu%u", ctx->cpu);
749 ctx_dir = debugfs_create_dir(name, hctx->debugfs_dir);
751 debugfs_create_files(ctx_dir, ctx, blk_mq_debugfs_ctx_attrs);
754 void blk_mq_debugfs_register_hctx(struct request_queue *q,
755 struct blk_mq_hw_ctx *hctx)
757 struct blk_mq_ctx *ctx;
761 snprintf(name, sizeof(name), "hctx%u", hctx->queue_num);
762 hctx->debugfs_dir = debugfs_create_dir(name, q->debugfs_dir);
764 debugfs_create_files(hctx->debugfs_dir, hctx, blk_mq_debugfs_hctx_attrs);
766 hctx_for_each_ctx(hctx, ctx, i)
767 blk_mq_debugfs_register_ctx(hctx, ctx);
770 void blk_mq_debugfs_unregister_hctx(struct blk_mq_hw_ctx *hctx)
772 debugfs_remove_recursive(hctx->debugfs_dir);
773 hctx->sched_debugfs_dir = NULL;
774 hctx->debugfs_dir = NULL;
777 void blk_mq_debugfs_register_hctxs(struct request_queue *q)
779 struct blk_mq_hw_ctx *hctx;
782 queue_for_each_hw_ctx(q, hctx, i)
783 blk_mq_debugfs_register_hctx(q, hctx);
786 void blk_mq_debugfs_unregister_hctxs(struct request_queue *q)
788 struct blk_mq_hw_ctx *hctx;
791 queue_for_each_hw_ctx(q, hctx, i)
792 blk_mq_debugfs_unregister_hctx(hctx);
795 void blk_mq_debugfs_register_sched(struct request_queue *q)
797 struct elevator_type *e = q->elevator->type;
800 * If the parent directory has not been created yet, return, we will be
801 * called again later on and the directory/files will be created then.
806 if (!e->queue_debugfs_attrs)
809 q->sched_debugfs_dir = debugfs_create_dir("sched", q->debugfs_dir);
811 debugfs_create_files(q->sched_debugfs_dir, q, e->queue_debugfs_attrs);
814 void blk_mq_debugfs_unregister_sched(struct request_queue *q)
816 debugfs_remove_recursive(q->sched_debugfs_dir);
817 q->sched_debugfs_dir = NULL;
820 static const char *rq_qos_id_to_name(enum rq_qos_id id)
835 void blk_mq_debugfs_unregister_rqos(struct rq_qos *rqos)
837 debugfs_remove_recursive(rqos->debugfs_dir);
838 rqos->debugfs_dir = NULL;
841 void blk_mq_debugfs_register_rqos(struct rq_qos *rqos)
843 struct request_queue *q = rqos->q;
844 const char *dir_name = rq_qos_id_to_name(rqos->id);
846 if (rqos->debugfs_dir || !rqos->ops->debugfs_attrs)
849 if (!q->rqos_debugfs_dir)
850 q->rqos_debugfs_dir = debugfs_create_dir("rqos",
853 rqos->debugfs_dir = debugfs_create_dir(dir_name,
854 rqos->q->rqos_debugfs_dir);
856 debugfs_create_files(rqos->debugfs_dir, rqos, rqos->ops->debugfs_attrs);
859 void blk_mq_debugfs_unregister_queue_rqos(struct request_queue *q)
861 debugfs_remove_recursive(q->rqos_debugfs_dir);
862 q->rqos_debugfs_dir = NULL;
865 void blk_mq_debugfs_register_sched_hctx(struct request_queue *q,
866 struct blk_mq_hw_ctx *hctx)
868 struct elevator_type *e = q->elevator->type;
871 * If the parent debugfs directory has not been created yet, return;
872 * We will be called again later on with appropriate parent debugfs
873 * directory from blk_register_queue()
875 if (!hctx->debugfs_dir)
878 if (!e->hctx_debugfs_attrs)
881 hctx->sched_debugfs_dir = debugfs_create_dir("sched",
883 debugfs_create_files(hctx->sched_debugfs_dir, hctx,
884 e->hctx_debugfs_attrs);
887 void blk_mq_debugfs_unregister_sched_hctx(struct blk_mq_hw_ctx *hctx)
889 debugfs_remove_recursive(hctx->sched_debugfs_dir);
890 hctx->sched_debugfs_dir = NULL;