2 * Copyright (C) 2017 Facebook
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public License
14 * along with this program. If not, see <https://www.gnu.org/licenses/>.
17 #include <linux/kernel.h>
18 #include <linux/blkdev.h>
19 #include <linux/debugfs.h>
21 #include <linux/blk-mq.h>
24 #include "blk-mq-tag.h"
26 struct blk_mq_debugfs_attr {
29 const struct file_operations *fops;
32 static int blk_mq_debugfs_seq_open(struct inode *inode, struct file *file,
33 const struct seq_operations *ops)
38 ret = seq_open(file, ops);
40 m = file->private_data;
41 m->private = inode->i_private;
46 static int blk_flags_show(struct seq_file *m, const unsigned long flags,
47 const char *const *flag_name, int flag_name_count)
52 for (i = 0; i < sizeof(flags) * BITS_PER_BYTE; i++) {
53 if (!(flags & BIT(i)))
58 if (i < flag_name_count && flag_name[i])
59 seq_puts(m, flag_name[i]);
61 seq_printf(m, "%d", i);
66 static const char *const blk_queue_flag_name[] = {
67 [QUEUE_FLAG_QUEUED] = "QUEUED",
68 [QUEUE_FLAG_STOPPED] = "STOPPED",
69 [QUEUE_FLAG_SYNCFULL] = "SYNCFULL",
70 [QUEUE_FLAG_ASYNCFULL] = "ASYNCFULL",
71 [QUEUE_FLAG_DYING] = "DYING",
72 [QUEUE_FLAG_BYPASS] = "BYPASS",
73 [QUEUE_FLAG_BIDI] = "BIDI",
74 [QUEUE_FLAG_NOMERGES] = "NOMERGES",
75 [QUEUE_FLAG_SAME_COMP] = "SAME_COMP",
76 [QUEUE_FLAG_FAIL_IO] = "FAIL_IO",
77 [QUEUE_FLAG_STACKABLE] = "STACKABLE",
78 [QUEUE_FLAG_NONROT] = "NONROT",
79 [QUEUE_FLAG_IO_STAT] = "IO_STAT",
80 [QUEUE_FLAG_DISCARD] = "DISCARD",
81 [QUEUE_FLAG_NOXMERGES] = "NOXMERGES",
82 [QUEUE_FLAG_ADD_RANDOM] = "ADD_RANDOM",
83 [QUEUE_FLAG_SECERASE] = "SECERASE",
84 [QUEUE_FLAG_SAME_FORCE] = "SAME_FORCE",
85 [QUEUE_FLAG_DEAD] = "DEAD",
86 [QUEUE_FLAG_INIT_DONE] = "INIT_DONE",
87 [QUEUE_FLAG_NO_SG_MERGE] = "NO_SG_MERGE",
88 [QUEUE_FLAG_POLL] = "POLL",
89 [QUEUE_FLAG_WC] = "WC",
90 [QUEUE_FLAG_FUA] = "FUA",
91 [QUEUE_FLAG_FLUSH_NQ] = "FLUSH_NQ",
92 [QUEUE_FLAG_DAX] = "DAX",
93 [QUEUE_FLAG_STATS] = "STATS",
94 [QUEUE_FLAG_POLL_STATS] = "POLL_STATS",
95 [QUEUE_FLAG_REGISTERED] = "REGISTERED",
98 static int blk_queue_flags_show(struct seq_file *m, void *v)
100 struct request_queue *q = m->private;
102 blk_flags_show(m, q->queue_flags, blk_queue_flag_name,
103 ARRAY_SIZE(blk_queue_flag_name));
108 static ssize_t blk_queue_flags_store(struct file *file, const char __user *ubuf,
109 size_t len, loff_t *offp)
111 struct request_queue *q = file_inode(file)->i_private;
112 char op[16] = { }, *s;
114 len = min(len, sizeof(op) - 1);
115 if (copy_from_user(op, ubuf, len))
118 strsep(&s, " \t\n"); /* strip trailing whitespace */
119 if (strcmp(op, "run") == 0) {
120 blk_mq_run_hw_queues(q, true);
121 } else if (strcmp(op, "start") == 0) {
122 blk_mq_start_stopped_hw_queues(q, true);
124 pr_err("%s: unsupported operation %s. Use either 'run' or 'start'\n",
131 static int blk_queue_flags_open(struct inode *inode, struct file *file)
133 return single_open(file, blk_queue_flags_show, inode->i_private);
136 static const struct file_operations blk_queue_flags_fops = {
137 .open = blk_queue_flags_open,
140 .release = single_release,
141 .write = blk_queue_flags_store,
144 static void print_stat(struct seq_file *m, struct blk_rq_stat *stat)
146 if (stat->nr_samples) {
147 seq_printf(m, "samples=%d, mean=%lld, min=%llu, max=%llu",
148 stat->nr_samples, stat->mean, stat->min, stat->max);
150 seq_puts(m, "samples=0");
154 static int queue_poll_stat_show(struct seq_file *m, void *v)
156 struct request_queue *q = m->private;
159 for (bucket = 0; bucket < BLK_MQ_POLL_STATS_BKTS/2; bucket++) {
160 seq_printf(m, "read (%d Bytes): ", 1 << (9+bucket));
161 print_stat(m, &q->poll_stat[2*bucket]);
164 seq_printf(m, "write (%d Bytes): ", 1 << (9+bucket));
165 print_stat(m, &q->poll_stat[2*bucket+1]);
171 static int queue_poll_stat_open(struct inode *inode, struct file *file)
173 return single_open(file, queue_poll_stat_show, inode->i_private);
176 static const struct file_operations queue_poll_stat_fops = {
177 .open = queue_poll_stat_open,
180 .release = single_release,
183 static const char *const hctx_state_name[] = {
184 [BLK_MQ_S_STOPPED] = "STOPPED",
185 [BLK_MQ_S_TAG_ACTIVE] = "TAG_ACTIVE",
186 [BLK_MQ_S_SCHED_RESTART] = "SCHED_RESTART",
187 [BLK_MQ_S_TAG_WAITING] = "TAG_WAITING",
190 static int hctx_state_show(struct seq_file *m, void *v)
192 struct blk_mq_hw_ctx *hctx = m->private;
194 blk_flags_show(m, hctx->state, hctx_state_name,
195 ARRAY_SIZE(hctx_state_name));
200 static int hctx_state_open(struct inode *inode, struct file *file)
202 return single_open(file, hctx_state_show, inode->i_private);
205 static const struct file_operations hctx_state_fops = {
206 .open = hctx_state_open,
209 .release = single_release,
212 static const char *const alloc_policy_name[] = {
213 [BLK_TAG_ALLOC_FIFO] = "fifo",
214 [BLK_TAG_ALLOC_RR] = "rr",
217 static const char *const hctx_flag_name[] = {
218 [ilog2(BLK_MQ_F_SHOULD_MERGE)] = "SHOULD_MERGE",
219 [ilog2(BLK_MQ_F_TAG_SHARED)] = "TAG_SHARED",
220 [ilog2(BLK_MQ_F_SG_MERGE)] = "SG_MERGE",
221 [ilog2(BLK_MQ_F_BLOCKING)] = "BLOCKING",
222 [ilog2(BLK_MQ_F_NO_SCHED)] = "NO_SCHED",
225 static int hctx_flags_show(struct seq_file *m, void *v)
227 struct blk_mq_hw_ctx *hctx = m->private;
228 const int alloc_policy = BLK_MQ_FLAG_TO_ALLOC_POLICY(hctx->flags);
230 seq_puts(m, "alloc_policy=");
231 if (alloc_policy < ARRAY_SIZE(alloc_policy_name) &&
232 alloc_policy_name[alloc_policy])
233 seq_puts(m, alloc_policy_name[alloc_policy]);
235 seq_printf(m, "%d", alloc_policy);
238 hctx->flags ^ BLK_ALLOC_POLICY_TO_MQ_FLAG(alloc_policy),
239 hctx_flag_name, ARRAY_SIZE(hctx_flag_name));
244 static int hctx_flags_open(struct inode *inode, struct file *file)
246 return single_open(file, hctx_flags_show, inode->i_private);
249 static const struct file_operations hctx_flags_fops = {
250 .open = hctx_flags_open,
253 .release = single_release,
256 static const char *const op_name[] = {
257 [REQ_OP_READ] = "READ",
258 [REQ_OP_WRITE] = "WRITE",
259 [REQ_OP_FLUSH] = "FLUSH",
260 [REQ_OP_DISCARD] = "DISCARD",
261 [REQ_OP_ZONE_REPORT] = "ZONE_REPORT",
262 [REQ_OP_SECURE_ERASE] = "SECURE_ERASE",
263 [REQ_OP_ZONE_RESET] = "ZONE_RESET",
264 [REQ_OP_WRITE_SAME] = "WRITE_SAME",
265 [REQ_OP_WRITE_ZEROES] = "WRITE_ZEROES",
266 [REQ_OP_SCSI_IN] = "SCSI_IN",
267 [REQ_OP_SCSI_OUT] = "SCSI_OUT",
268 [REQ_OP_DRV_IN] = "DRV_IN",
269 [REQ_OP_DRV_OUT] = "DRV_OUT",
272 static const char *const cmd_flag_name[] = {
273 [__REQ_FAILFAST_DEV] = "FAILFAST_DEV",
274 [__REQ_FAILFAST_TRANSPORT] = "FAILFAST_TRANSPORT",
275 [__REQ_FAILFAST_DRIVER] = "FAILFAST_DRIVER",
276 [__REQ_SYNC] = "SYNC",
277 [__REQ_META] = "META",
278 [__REQ_PRIO] = "PRIO",
279 [__REQ_NOMERGE] = "NOMERGE",
280 [__REQ_IDLE] = "IDLE",
281 [__REQ_INTEGRITY] = "INTEGRITY",
283 [__REQ_PREFLUSH] = "PREFLUSH",
284 [__REQ_RAHEAD] = "RAHEAD",
285 [__REQ_BACKGROUND] = "BACKGROUND",
286 [__REQ_NR_BITS] = "NR_BITS",
289 static const char *const rqf_name[] = {
290 [ilog2((__force u32)RQF_SORTED)] = "SORTED",
291 [ilog2((__force u32)RQF_STARTED)] = "STARTED",
292 [ilog2((__force u32)RQF_QUEUED)] = "QUEUED",
293 [ilog2((__force u32)RQF_SOFTBARRIER)] = "SOFTBARRIER",
294 [ilog2((__force u32)RQF_FLUSH_SEQ)] = "FLUSH_SEQ",
295 [ilog2((__force u32)RQF_MIXED_MERGE)] = "MIXED_MERGE",
296 [ilog2((__force u32)RQF_MQ_INFLIGHT)] = "MQ_INFLIGHT",
297 [ilog2((__force u32)RQF_DONTPREP)] = "DONTPREP",
298 [ilog2((__force u32)RQF_PREEMPT)] = "PREEMPT",
299 [ilog2((__force u32)RQF_COPY_USER)] = "COPY_USER",
300 [ilog2((__force u32)RQF_FAILED)] = "FAILED",
301 [ilog2((__force u32)RQF_QUIET)] = "QUIET",
302 [ilog2((__force u32)RQF_ELVPRIV)] = "ELVPRIV",
303 [ilog2((__force u32)RQF_IO_STAT)] = "IO_STAT",
304 [ilog2((__force u32)RQF_ALLOCED)] = "ALLOCED",
305 [ilog2((__force u32)RQF_PM)] = "PM",
306 [ilog2((__force u32)RQF_HASHED)] = "HASHED",
307 [ilog2((__force u32)RQF_STATS)] = "STATS",
308 [ilog2((__force u32)RQF_SPECIAL_PAYLOAD)] = "SPECIAL_PAYLOAD",
311 static int blk_mq_debugfs_rq_show(struct seq_file *m, void *v)
313 struct request *rq = list_entry_rq(v);
314 const struct blk_mq_ops *const mq_ops = rq->q->mq_ops;
315 const unsigned int op = rq->cmd_flags & REQ_OP_MASK;
317 seq_printf(m, "%p {.op=", rq);
318 if (op < ARRAY_SIZE(op_name) && op_name[op])
319 seq_printf(m, "%s", op_name[op]);
321 seq_printf(m, "%d", op);
322 seq_puts(m, ", .cmd_flags=");
323 blk_flags_show(m, rq->cmd_flags & ~REQ_OP_MASK, cmd_flag_name,
324 ARRAY_SIZE(cmd_flag_name));
325 seq_puts(m, ", .rq_flags=");
326 blk_flags_show(m, (__force unsigned int)rq->rq_flags, rqf_name,
327 ARRAY_SIZE(rqf_name));
328 seq_printf(m, ", .tag=%d, .internal_tag=%d", rq->tag,
331 mq_ops->show_rq(m, rq);
336 static void *hctx_dispatch_start(struct seq_file *m, loff_t *pos)
337 __acquires(&hctx->lock)
339 struct blk_mq_hw_ctx *hctx = m->private;
341 spin_lock(&hctx->lock);
342 return seq_list_start(&hctx->dispatch, *pos);
345 static void *hctx_dispatch_next(struct seq_file *m, void *v, loff_t *pos)
347 struct blk_mq_hw_ctx *hctx = m->private;
349 return seq_list_next(v, &hctx->dispatch, pos);
352 static void hctx_dispatch_stop(struct seq_file *m, void *v)
353 __releases(&hctx->lock)
355 struct blk_mq_hw_ctx *hctx = m->private;
357 spin_unlock(&hctx->lock);
360 static const struct seq_operations hctx_dispatch_seq_ops = {
361 .start = hctx_dispatch_start,
362 .next = hctx_dispatch_next,
363 .stop = hctx_dispatch_stop,
364 .show = blk_mq_debugfs_rq_show,
367 static int hctx_dispatch_open(struct inode *inode, struct file *file)
369 return blk_mq_debugfs_seq_open(inode, file, &hctx_dispatch_seq_ops);
372 static const struct file_operations hctx_dispatch_fops = {
373 .open = hctx_dispatch_open,
376 .release = seq_release,
379 static int hctx_ctx_map_show(struct seq_file *m, void *v)
381 struct blk_mq_hw_ctx *hctx = m->private;
383 sbitmap_bitmap_show(&hctx->ctx_map, m);
387 static int hctx_ctx_map_open(struct inode *inode, struct file *file)
389 return single_open(file, hctx_ctx_map_show, inode->i_private);
392 static const struct file_operations hctx_ctx_map_fops = {
393 .open = hctx_ctx_map_open,
396 .release = single_release,
399 static void blk_mq_debugfs_tags_show(struct seq_file *m,
400 struct blk_mq_tags *tags)
402 seq_printf(m, "nr_tags=%u\n", tags->nr_tags);
403 seq_printf(m, "nr_reserved_tags=%u\n", tags->nr_reserved_tags);
404 seq_printf(m, "active_queues=%d\n",
405 atomic_read(&tags->active_queues));
407 seq_puts(m, "\nbitmap_tags:\n");
408 sbitmap_queue_show(&tags->bitmap_tags, m);
410 if (tags->nr_reserved_tags) {
411 seq_puts(m, "\nbreserved_tags:\n");
412 sbitmap_queue_show(&tags->breserved_tags, m);
416 static int hctx_tags_show(struct seq_file *m, void *v)
418 struct blk_mq_hw_ctx *hctx = m->private;
419 struct request_queue *q = hctx->queue;
422 res = mutex_lock_interruptible(&q->sysfs_lock);
426 blk_mq_debugfs_tags_show(m, hctx->tags);
427 mutex_unlock(&q->sysfs_lock);
433 static int hctx_tags_open(struct inode *inode, struct file *file)
435 return single_open(file, hctx_tags_show, inode->i_private);
438 static const struct file_operations hctx_tags_fops = {
439 .open = hctx_tags_open,
442 .release = single_release,
445 static int hctx_tags_bitmap_show(struct seq_file *m, void *v)
447 struct blk_mq_hw_ctx *hctx = m->private;
448 struct request_queue *q = hctx->queue;
451 res = mutex_lock_interruptible(&q->sysfs_lock);
455 sbitmap_bitmap_show(&hctx->tags->bitmap_tags.sb, m);
456 mutex_unlock(&q->sysfs_lock);
462 static int hctx_tags_bitmap_open(struct inode *inode, struct file *file)
464 return single_open(file, hctx_tags_bitmap_show, inode->i_private);
467 static const struct file_operations hctx_tags_bitmap_fops = {
468 .open = hctx_tags_bitmap_open,
471 .release = single_release,
474 static int hctx_sched_tags_show(struct seq_file *m, void *v)
476 struct blk_mq_hw_ctx *hctx = m->private;
477 struct request_queue *q = hctx->queue;
480 res = mutex_lock_interruptible(&q->sysfs_lock);
483 if (hctx->sched_tags)
484 blk_mq_debugfs_tags_show(m, hctx->sched_tags);
485 mutex_unlock(&q->sysfs_lock);
491 static int hctx_sched_tags_open(struct inode *inode, struct file *file)
493 return single_open(file, hctx_sched_tags_show, inode->i_private);
496 static const struct file_operations hctx_sched_tags_fops = {
497 .open = hctx_sched_tags_open,
500 .release = single_release,
503 static int hctx_sched_tags_bitmap_show(struct seq_file *m, void *v)
505 struct blk_mq_hw_ctx *hctx = m->private;
506 struct request_queue *q = hctx->queue;
509 res = mutex_lock_interruptible(&q->sysfs_lock);
512 if (hctx->sched_tags)
513 sbitmap_bitmap_show(&hctx->sched_tags->bitmap_tags.sb, m);
514 mutex_unlock(&q->sysfs_lock);
520 static int hctx_sched_tags_bitmap_open(struct inode *inode, struct file *file)
522 return single_open(file, hctx_sched_tags_bitmap_show, inode->i_private);
525 static const struct file_operations hctx_sched_tags_bitmap_fops = {
526 .open = hctx_sched_tags_bitmap_open,
529 .release = single_release,
532 static int hctx_io_poll_show(struct seq_file *m, void *v)
534 struct blk_mq_hw_ctx *hctx = m->private;
536 seq_printf(m, "considered=%lu\n", hctx->poll_considered);
537 seq_printf(m, "invoked=%lu\n", hctx->poll_invoked);
538 seq_printf(m, "success=%lu\n", hctx->poll_success);
542 static int hctx_io_poll_open(struct inode *inode, struct file *file)
544 return single_open(file, hctx_io_poll_show, inode->i_private);
547 static ssize_t hctx_io_poll_write(struct file *file, const char __user *buf,
548 size_t count, loff_t *ppos)
550 struct seq_file *m = file->private_data;
551 struct blk_mq_hw_ctx *hctx = m->private;
553 hctx->poll_considered = hctx->poll_invoked = hctx->poll_success = 0;
557 static const struct file_operations hctx_io_poll_fops = {
558 .open = hctx_io_poll_open,
560 .write = hctx_io_poll_write,
562 .release = single_release,
565 static int hctx_dispatched_show(struct seq_file *m, void *v)
567 struct blk_mq_hw_ctx *hctx = m->private;
570 seq_printf(m, "%8u\t%lu\n", 0U, hctx->dispatched[0]);
572 for (i = 1; i < BLK_MQ_MAX_DISPATCH_ORDER - 1; i++) {
573 unsigned int d = 1U << (i - 1);
575 seq_printf(m, "%8u\t%lu\n", d, hctx->dispatched[i]);
578 seq_printf(m, "%8u+\t%lu\n", 1U << (i - 1), hctx->dispatched[i]);
582 static int hctx_dispatched_open(struct inode *inode, struct file *file)
584 return single_open(file, hctx_dispatched_show, inode->i_private);
587 static ssize_t hctx_dispatched_write(struct file *file, const char __user *buf,
588 size_t count, loff_t *ppos)
590 struct seq_file *m = file->private_data;
591 struct blk_mq_hw_ctx *hctx = m->private;
594 for (i = 0; i < BLK_MQ_MAX_DISPATCH_ORDER; i++)
595 hctx->dispatched[i] = 0;
599 static const struct file_operations hctx_dispatched_fops = {
600 .open = hctx_dispatched_open,
602 .write = hctx_dispatched_write,
604 .release = single_release,
607 static int hctx_queued_show(struct seq_file *m, void *v)
609 struct blk_mq_hw_ctx *hctx = m->private;
611 seq_printf(m, "%lu\n", hctx->queued);
615 static int hctx_queued_open(struct inode *inode, struct file *file)
617 return single_open(file, hctx_queued_show, inode->i_private);
620 static ssize_t hctx_queued_write(struct file *file, const char __user *buf,
621 size_t count, loff_t *ppos)
623 struct seq_file *m = file->private_data;
624 struct blk_mq_hw_ctx *hctx = m->private;
630 static const struct file_operations hctx_queued_fops = {
631 .open = hctx_queued_open,
633 .write = hctx_queued_write,
635 .release = single_release,
638 static int hctx_run_show(struct seq_file *m, void *v)
640 struct blk_mq_hw_ctx *hctx = m->private;
642 seq_printf(m, "%lu\n", hctx->run);
646 static int hctx_run_open(struct inode *inode, struct file *file)
648 return single_open(file, hctx_run_show, inode->i_private);
651 static ssize_t hctx_run_write(struct file *file, const char __user *buf,
652 size_t count, loff_t *ppos)
654 struct seq_file *m = file->private_data;
655 struct blk_mq_hw_ctx *hctx = m->private;
661 static const struct file_operations hctx_run_fops = {
662 .open = hctx_run_open,
664 .write = hctx_run_write,
666 .release = single_release,
669 static int hctx_active_show(struct seq_file *m, void *v)
671 struct blk_mq_hw_ctx *hctx = m->private;
673 seq_printf(m, "%d\n", atomic_read(&hctx->nr_active));
677 static int hctx_active_open(struct inode *inode, struct file *file)
679 return single_open(file, hctx_active_show, inode->i_private);
682 static const struct file_operations hctx_active_fops = {
683 .open = hctx_active_open,
686 .release = single_release,
689 static void *ctx_rq_list_start(struct seq_file *m, loff_t *pos)
690 __acquires(&ctx->lock)
692 struct blk_mq_ctx *ctx = m->private;
694 spin_lock(&ctx->lock);
695 return seq_list_start(&ctx->rq_list, *pos);
698 static void *ctx_rq_list_next(struct seq_file *m, void *v, loff_t *pos)
700 struct blk_mq_ctx *ctx = m->private;
702 return seq_list_next(v, &ctx->rq_list, pos);
705 static void ctx_rq_list_stop(struct seq_file *m, void *v)
706 __releases(&ctx->lock)
708 struct blk_mq_ctx *ctx = m->private;
710 spin_unlock(&ctx->lock);
713 static const struct seq_operations ctx_rq_list_seq_ops = {
714 .start = ctx_rq_list_start,
715 .next = ctx_rq_list_next,
716 .stop = ctx_rq_list_stop,
717 .show = blk_mq_debugfs_rq_show,
720 static int ctx_rq_list_open(struct inode *inode, struct file *file)
722 return blk_mq_debugfs_seq_open(inode, file, &ctx_rq_list_seq_ops);
725 static const struct file_operations ctx_rq_list_fops = {
726 .open = ctx_rq_list_open,
729 .release = seq_release,
732 static int ctx_dispatched_show(struct seq_file *m, void *v)
734 struct blk_mq_ctx *ctx = m->private;
736 seq_printf(m, "%lu %lu\n", ctx->rq_dispatched[1], ctx->rq_dispatched[0]);
740 static int ctx_dispatched_open(struct inode *inode, struct file *file)
742 return single_open(file, ctx_dispatched_show, inode->i_private);
745 static ssize_t ctx_dispatched_write(struct file *file, const char __user *buf,
746 size_t count, loff_t *ppos)
748 struct seq_file *m = file->private_data;
749 struct blk_mq_ctx *ctx = m->private;
751 ctx->rq_dispatched[0] = ctx->rq_dispatched[1] = 0;
755 static const struct file_operations ctx_dispatched_fops = {
756 .open = ctx_dispatched_open,
758 .write = ctx_dispatched_write,
760 .release = single_release,
763 static int ctx_merged_show(struct seq_file *m, void *v)
765 struct blk_mq_ctx *ctx = m->private;
767 seq_printf(m, "%lu\n", ctx->rq_merged);
771 static int ctx_merged_open(struct inode *inode, struct file *file)
773 return single_open(file, ctx_merged_show, inode->i_private);
776 static ssize_t ctx_merged_write(struct file *file, const char __user *buf,
777 size_t count, loff_t *ppos)
779 struct seq_file *m = file->private_data;
780 struct blk_mq_ctx *ctx = m->private;
786 static const struct file_operations ctx_merged_fops = {
787 .open = ctx_merged_open,
789 .write = ctx_merged_write,
791 .release = single_release,
794 static int ctx_completed_show(struct seq_file *m, void *v)
796 struct blk_mq_ctx *ctx = m->private;
798 seq_printf(m, "%lu %lu\n", ctx->rq_completed[1], ctx->rq_completed[0]);
802 static int ctx_completed_open(struct inode *inode, struct file *file)
804 return single_open(file, ctx_completed_show, inode->i_private);
807 static ssize_t ctx_completed_write(struct file *file, const char __user *buf,
808 size_t count, loff_t *ppos)
810 struct seq_file *m = file->private_data;
811 struct blk_mq_ctx *ctx = m->private;
813 ctx->rq_completed[0] = ctx->rq_completed[1] = 0;
817 static const struct file_operations ctx_completed_fops = {
818 .open = ctx_completed_open,
820 .write = ctx_completed_write,
822 .release = single_release,
825 static const struct blk_mq_debugfs_attr blk_mq_debugfs_queue_attrs[] = {
826 {"poll_stat", 0400, &queue_poll_stat_fops},
827 {"state", 0600, &blk_queue_flags_fops},
831 static const struct blk_mq_debugfs_attr blk_mq_debugfs_hctx_attrs[] = {
832 {"state", 0400, &hctx_state_fops},
833 {"flags", 0400, &hctx_flags_fops},
834 {"dispatch", 0400, &hctx_dispatch_fops},
835 {"ctx_map", 0400, &hctx_ctx_map_fops},
836 {"tags", 0400, &hctx_tags_fops},
837 {"tags_bitmap", 0400, &hctx_tags_bitmap_fops},
838 {"sched_tags", 0400, &hctx_sched_tags_fops},
839 {"sched_tags_bitmap", 0400, &hctx_sched_tags_bitmap_fops},
840 {"io_poll", 0600, &hctx_io_poll_fops},
841 {"dispatched", 0600, &hctx_dispatched_fops},
842 {"queued", 0600, &hctx_queued_fops},
843 {"run", 0600, &hctx_run_fops},
844 {"active", 0400, &hctx_active_fops},
848 static const struct blk_mq_debugfs_attr blk_mq_debugfs_ctx_attrs[] = {
849 {"rq_list", 0400, &ctx_rq_list_fops},
850 {"dispatched", 0600, &ctx_dispatched_fops},
851 {"merged", 0600, &ctx_merged_fops},
852 {"completed", 0600, &ctx_completed_fops},
856 int blk_mq_debugfs_register(struct request_queue *q)
858 if (!blk_debugfs_root)
861 q->debugfs_dir = debugfs_create_dir(kobject_name(q->kobj.parent),
866 if (blk_mq_debugfs_register_mq(q))
872 blk_mq_debugfs_unregister(q);
876 void blk_mq_debugfs_unregister(struct request_queue *q)
878 debugfs_remove_recursive(q->debugfs_dir);
879 q->mq_debugfs_dir = NULL;
880 q->debugfs_dir = NULL;
883 static bool debugfs_create_files(struct dentry *parent, void *data,
884 const struct blk_mq_debugfs_attr *attr)
886 for (; attr->name; attr++) {
887 if (!debugfs_create_file(attr->name, attr->mode, parent,
894 static int blk_mq_debugfs_register_ctx(struct request_queue *q,
895 struct blk_mq_ctx *ctx,
896 struct dentry *hctx_dir)
898 struct dentry *ctx_dir;
901 snprintf(name, sizeof(name), "cpu%u", ctx->cpu);
902 ctx_dir = debugfs_create_dir(name, hctx_dir);
906 if (!debugfs_create_files(ctx_dir, ctx, blk_mq_debugfs_ctx_attrs))
912 static int blk_mq_debugfs_register_hctx(struct request_queue *q,
913 struct blk_mq_hw_ctx *hctx)
915 struct blk_mq_ctx *ctx;
916 struct dentry *hctx_dir;
920 snprintf(name, sizeof(name), "%u", hctx->queue_num);
921 hctx_dir = debugfs_create_dir(name, q->mq_debugfs_dir);
925 if (!debugfs_create_files(hctx_dir, hctx, blk_mq_debugfs_hctx_attrs))
928 hctx_for_each_ctx(hctx, ctx, i) {
929 if (blk_mq_debugfs_register_ctx(q, ctx, hctx_dir))
936 int blk_mq_debugfs_register_mq(struct request_queue *q)
938 struct blk_mq_hw_ctx *hctx;
944 q->mq_debugfs_dir = debugfs_create_dir("mq", q->debugfs_dir);
945 if (!q->mq_debugfs_dir)
948 if (!debugfs_create_files(q->mq_debugfs_dir, q, blk_mq_debugfs_queue_attrs))
951 queue_for_each_hw_ctx(q, hctx, i) {
952 if (blk_mq_debugfs_register_hctx(q, hctx))
959 blk_mq_debugfs_unregister_mq(q);
963 void blk_mq_debugfs_unregister_mq(struct request_queue *q)
965 debugfs_remove_recursive(q->mq_debugfs_dir);
966 q->mq_debugfs_dir = NULL;