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17#include <linux/kernel.h>
18#include <linux/blkdev.h>
19#include <linux/debugfs.h>
20
21#include <linux/blk-mq.h>
22#include "blk.h"
23#include "blk-mq.h"
24#include "blk-mq-debugfs.h"
25#include "blk-mq-tag.h"
26
27static void print_stat(struct seq_file *m, struct blk_rq_stat *stat)
28{
29 if (stat->nr_samples) {
30 seq_printf(m, "samples=%d, mean=%lld, min=%llu, max=%llu",
31 stat->nr_samples, stat->mean, stat->min, stat->max);
32 } else {
33 seq_puts(m, "samples=0");
34 }
35}
36
37static int queue_poll_stat_show(void *data, struct seq_file *m)
38{
39 struct request_queue *q = data;
40 int bucket;
41
42 for (bucket = 0; bucket < BLK_MQ_POLL_STATS_BKTS/2; bucket++) {
43 seq_printf(m, "read (%d Bytes): ", 1 << (9+bucket));
44 print_stat(m, &q->poll_stat[2*bucket]);
45 seq_puts(m, "\n");
46
47 seq_printf(m, "write (%d Bytes): ", 1 << (9+bucket));
48 print_stat(m, &q->poll_stat[2*bucket+1]);
49 seq_puts(m, "\n");
50 }
51 return 0;
52}
53
54static void *queue_requeue_list_start(struct seq_file *m, loff_t *pos)
55 __acquires(&q->requeue_lock)
56{
57 struct request_queue *q = m->private;
58
59 spin_lock_irq(&q->requeue_lock);
60 return seq_list_start(&q->requeue_list, *pos);
61}
62
63static void *queue_requeue_list_next(struct seq_file *m, void *v, loff_t *pos)
64{
65 struct request_queue *q = m->private;
66
67 return seq_list_next(v, &q->requeue_list, pos);
68}
69
70static void queue_requeue_list_stop(struct seq_file *m, void *v)
71 __releases(&q->requeue_lock)
72{
73 struct request_queue *q = m->private;
74
75 spin_unlock_irq(&q->requeue_lock);
76}
77
78static const struct seq_operations queue_requeue_list_seq_ops = {
79 .start = queue_requeue_list_start,
80 .next = queue_requeue_list_next,
81 .stop = queue_requeue_list_stop,
82 .show = blk_mq_debugfs_rq_show,
83};
84
85static int blk_flags_show(struct seq_file *m, const unsigned long flags,
86 const char *const *flag_name, int flag_name_count)
87{
88 bool sep = false;
89 int i;
90
91 for (i = 0; i < sizeof(flags) * BITS_PER_BYTE; i++) {
92 if (!(flags & BIT(i)))
93 continue;
94 if (sep)
95 seq_puts(m, "|");
96 sep = true;
97 if (i < flag_name_count && flag_name[i])
98 seq_puts(m, flag_name[i]);
99 else
100 seq_printf(m, "%d", i);
101 }
102 return 0;
103}
104
105#define QUEUE_FLAG_NAME(name) [QUEUE_FLAG_##name] = #name
106static const char *const blk_queue_flag_name[] = {
107 QUEUE_FLAG_NAME(QUEUED),
108 QUEUE_FLAG_NAME(STOPPED),
109 QUEUE_FLAG_NAME(DYING),
110 QUEUE_FLAG_NAME(BYPASS),
111 QUEUE_FLAG_NAME(BIDI),
112 QUEUE_FLAG_NAME(NOMERGES),
113 QUEUE_FLAG_NAME(SAME_COMP),
114 QUEUE_FLAG_NAME(FAIL_IO),
115 QUEUE_FLAG_NAME(NONROT),
116 QUEUE_FLAG_NAME(IO_STAT),
117 QUEUE_FLAG_NAME(DISCARD),
118 QUEUE_FLAG_NAME(NOXMERGES),
119 QUEUE_FLAG_NAME(ADD_RANDOM),
120 QUEUE_FLAG_NAME(SECERASE),
121 QUEUE_FLAG_NAME(SAME_FORCE),
122 QUEUE_FLAG_NAME(DEAD),
123 QUEUE_FLAG_NAME(INIT_DONE),
124 QUEUE_FLAG_NAME(NO_SG_MERGE),
125 QUEUE_FLAG_NAME(POLL),
126 QUEUE_FLAG_NAME(WC),
127 QUEUE_FLAG_NAME(FUA),
128 QUEUE_FLAG_NAME(FLUSH_NQ),
129 QUEUE_FLAG_NAME(DAX),
130 QUEUE_FLAG_NAME(STATS),
131 QUEUE_FLAG_NAME(POLL_STATS),
132 QUEUE_FLAG_NAME(REGISTERED),
133 QUEUE_FLAG_NAME(SCSI_PASSTHROUGH),
134 QUEUE_FLAG_NAME(QUIESCED),
135 QUEUE_FLAG_NAME(PREEMPT_ONLY),
136};
137#undef QUEUE_FLAG_NAME
138
139static int queue_state_show(void *data, struct seq_file *m)
140{
141 struct request_queue *q = data;
142
143 blk_flags_show(m, q->queue_flags, blk_queue_flag_name,
144 ARRAY_SIZE(blk_queue_flag_name));
145 seq_puts(m, "\n");
146 return 0;
147}
148
149static ssize_t queue_state_write(void *data, const char __user *buf,
150 size_t count, loff_t *ppos)
151{
152 struct request_queue *q = data;
153 char opbuf[16] = { }, *op;
154
155
156
157
158
159
160 if (blk_queue_dead(q))
161 return -ENOENT;
162
163 if (count >= sizeof(opbuf)) {
164 pr_err("%s: operation too long\n", __func__);
165 goto inval;
166 }
167
168 if (copy_from_user(opbuf, buf, count))
169 return -EFAULT;
170 op = strstrip(opbuf);
171 if (strcmp(op, "run") == 0) {
172 blk_mq_run_hw_queues(q, true);
173 } else if (strcmp(op, "start") == 0) {
174 blk_mq_start_stopped_hw_queues(q, true);
175 } else if (strcmp(op, "kick") == 0) {
176 blk_mq_kick_requeue_list(q);
177 } else {
178 pr_err("%s: unsupported operation '%s'\n", __func__, op);
179inval:
180 pr_err("%s: use 'run', 'start' or 'kick'\n", __func__);
181 return -EINVAL;
182 }
183 return count;
184}
185
186static int queue_write_hint_show(void *data, struct seq_file *m)
187{
188 struct request_queue *q = data;
189 int i;
190
191 for (i = 0; i < BLK_MAX_WRITE_HINTS; i++)
192 seq_printf(m, "hint%d: %llu\n", i, q->write_hints[i]);
193
194 return 0;
195}
196
197static ssize_t queue_write_hint_store(void *data, const char __user *buf,
198 size_t count, loff_t *ppos)
199{
200 struct request_queue *q = data;
201 int i;
202
203 for (i = 0; i < BLK_MAX_WRITE_HINTS; i++)
204 q->write_hints[i] = 0;
205
206 return count;
207}
208
209static const struct blk_mq_debugfs_attr blk_mq_debugfs_queue_attrs[] = {
210 { "poll_stat", 0400, queue_poll_stat_show },
211 { "requeue_list", 0400, .seq_ops = &queue_requeue_list_seq_ops },
212 { "state", 0600, queue_state_show, queue_state_write },
213 { "write_hints", 0600, queue_write_hint_show, queue_write_hint_store },
214 { "zone_wlock", 0400, queue_zone_wlock_show, NULL },
215 { },
216};
217
218#define HCTX_STATE_NAME(name) [BLK_MQ_S_##name] = #name
219static const char *const hctx_state_name[] = {
220 HCTX_STATE_NAME(STOPPED),
221 HCTX_STATE_NAME(TAG_ACTIVE),
222 HCTX_STATE_NAME(SCHED_RESTART),
223};
224#undef HCTX_STATE_NAME
225
226static int hctx_state_show(void *data, struct seq_file *m)
227{
228 struct blk_mq_hw_ctx *hctx = data;
229
230 blk_flags_show(m, hctx->state, hctx_state_name,
231 ARRAY_SIZE(hctx_state_name));
232 seq_puts(m, "\n");
233 return 0;
234}
235
236#define BLK_TAG_ALLOC_NAME(name) [BLK_TAG_ALLOC_##name] = #name
237static const char *const alloc_policy_name[] = {
238 BLK_TAG_ALLOC_NAME(FIFO),
239 BLK_TAG_ALLOC_NAME(RR),
240};
241#undef BLK_TAG_ALLOC_NAME
242
243#define HCTX_FLAG_NAME(name) [ilog2(BLK_MQ_F_##name)] = #name
244static const char *const hctx_flag_name[] = {
245 HCTX_FLAG_NAME(SHOULD_MERGE),
246 HCTX_FLAG_NAME(TAG_SHARED),
247 HCTX_FLAG_NAME(SG_MERGE),
248 HCTX_FLAG_NAME(BLOCKING),
249 HCTX_FLAG_NAME(NO_SCHED),
250};
251#undef HCTX_FLAG_NAME
252
253static int hctx_flags_show(void *data, struct seq_file *m)
254{
255 struct blk_mq_hw_ctx *hctx = data;
256 const int alloc_policy = BLK_MQ_FLAG_TO_ALLOC_POLICY(hctx->flags);
257
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]);
262 else
263 seq_printf(m, "%d", alloc_policy);
264 seq_puts(m, " ");
265 blk_flags_show(m,
266 hctx->flags ^ BLK_ALLOC_POLICY_TO_MQ_FLAG(alloc_policy),
267 hctx_flag_name, ARRAY_SIZE(hctx_flag_name));
268 seq_puts(m, "\n");
269 return 0;
270}
271
272#define REQ_OP_NAME(name) [REQ_OP_##name] = #name
273static const char *const op_name[] = {
274 REQ_OP_NAME(READ),
275 REQ_OP_NAME(WRITE),
276 REQ_OP_NAME(FLUSH),
277 REQ_OP_NAME(DISCARD),
278 REQ_OP_NAME(ZONE_REPORT),
279 REQ_OP_NAME(SECURE_ERASE),
280 REQ_OP_NAME(ZONE_RESET),
281 REQ_OP_NAME(WRITE_SAME),
282 REQ_OP_NAME(WRITE_ZEROES),
283 REQ_OP_NAME(SCSI_IN),
284 REQ_OP_NAME(SCSI_OUT),
285 REQ_OP_NAME(DRV_IN),
286 REQ_OP_NAME(DRV_OUT),
287};
288#undef REQ_OP_NAME
289
290#define CMD_FLAG_NAME(name) [__REQ_##name] = #name
291static const char *const cmd_flag_name[] = {
292 CMD_FLAG_NAME(FAILFAST_DEV),
293 CMD_FLAG_NAME(FAILFAST_TRANSPORT),
294 CMD_FLAG_NAME(FAILFAST_DRIVER),
295 CMD_FLAG_NAME(SYNC),
296 CMD_FLAG_NAME(META),
297 CMD_FLAG_NAME(PRIO),
298 CMD_FLAG_NAME(NOMERGE),
299 CMD_FLAG_NAME(IDLE),
300 CMD_FLAG_NAME(INTEGRITY),
301 CMD_FLAG_NAME(FUA),
302 CMD_FLAG_NAME(PREFLUSH),
303 CMD_FLAG_NAME(RAHEAD),
304 CMD_FLAG_NAME(BACKGROUND),
305 CMD_FLAG_NAME(NOUNMAP),
306 CMD_FLAG_NAME(NOWAIT),
307};
308#undef CMD_FLAG_NAME
309
310#define RQF_NAME(name) [ilog2((__force u32)RQF_##name)] = #name
311static const char *const rqf_name[] = {
312 RQF_NAME(SORTED),
313 RQF_NAME(STARTED),
314 RQF_NAME(QUEUED),
315 RQF_NAME(SOFTBARRIER),
316 RQF_NAME(FLUSH_SEQ),
317 RQF_NAME(MIXED_MERGE),
318 RQF_NAME(MQ_INFLIGHT),
319 RQF_NAME(DONTPREP),
320 RQF_NAME(PREEMPT),
321 RQF_NAME(COPY_USER),
322 RQF_NAME(FAILED),
323 RQF_NAME(QUIET),
324 RQF_NAME(ELVPRIV),
325 RQF_NAME(IO_STAT),
326 RQF_NAME(ALLOCED),
327 RQF_NAME(PM),
328 RQF_NAME(HASHED),
329 RQF_NAME(STATS),
330 RQF_NAME(SPECIAL_PAYLOAD),
331 RQF_NAME(ZONE_WRITE_LOCKED),
332 RQF_NAME(MQ_POLL_SLEPT),
333};
334#undef RQF_NAME
335
336static const char *const blk_mq_rq_state_name_array[] = {
337 [MQ_RQ_IDLE] = "idle",
338 [MQ_RQ_IN_FLIGHT] = "in_flight",
339 [MQ_RQ_COMPLETE] = "complete",
340};
341
342static const char *blk_mq_rq_state_name(enum mq_rq_state rq_state)
343{
344 if (WARN_ON_ONCE((unsigned int)rq_state >=
345 ARRAY_SIZE(blk_mq_rq_state_name_array)))
346 return "(?)";
347 return blk_mq_rq_state_name_array[rq_state];
348}
349
350int __blk_mq_debugfs_rq_show(struct seq_file *m, struct request *rq)
351{
352 const struct blk_mq_ops *const mq_ops = rq->q->mq_ops;
353 const unsigned int op = rq->cmd_flags & REQ_OP_MASK;
354
355 seq_printf(m, "%p {.op=", rq);
356 if (op < ARRAY_SIZE(op_name) && op_name[op])
357 seq_printf(m, "%s", op_name[op]);
358 else
359 seq_printf(m, "%d", op);
360 seq_puts(m, ", .cmd_flags=");
361 blk_flags_show(m, rq->cmd_flags & ~REQ_OP_MASK, cmd_flag_name,
362 ARRAY_SIZE(cmd_flag_name));
363 seq_puts(m, ", .rq_flags=");
364 blk_flags_show(m, (__force unsigned int)rq->rq_flags, rqf_name,
365 ARRAY_SIZE(rqf_name));
366 seq_printf(m, ", .state=%s", blk_mq_rq_state_name(blk_mq_rq_state(rq)));
367 seq_printf(m, ", .tag=%d, .internal_tag=%d", rq->tag,
368 rq->internal_tag);
369 if (mq_ops->show_rq)
370 mq_ops->show_rq(m, rq);
371 seq_puts(m, "}\n");
372 return 0;
373}
374EXPORT_SYMBOL_GPL(__blk_mq_debugfs_rq_show);
375
376int blk_mq_debugfs_rq_show(struct seq_file *m, void *v)
377{
378 return __blk_mq_debugfs_rq_show(m, list_entry_rq(v));
379}
380EXPORT_SYMBOL_GPL(blk_mq_debugfs_rq_show);
381
382static void *hctx_dispatch_start(struct seq_file *m, loff_t *pos)
383 __acquires(&hctx->lock)
384{
385 struct blk_mq_hw_ctx *hctx = m->private;
386
387 spin_lock(&hctx->lock);
388 return seq_list_start(&hctx->dispatch, *pos);
389}
390
391static void *hctx_dispatch_next(struct seq_file *m, void *v, loff_t *pos)
392{
393 struct blk_mq_hw_ctx *hctx = m->private;
394
395 return seq_list_next(v, &hctx->dispatch, pos);
396}
397
398static void hctx_dispatch_stop(struct seq_file *m, void *v)
399 __releases(&hctx->lock)
400{
401 struct blk_mq_hw_ctx *hctx = m->private;
402
403 spin_unlock(&hctx->lock);
404}
405
406static const struct seq_operations hctx_dispatch_seq_ops = {
407 .start = hctx_dispatch_start,
408 .next = hctx_dispatch_next,
409 .stop = hctx_dispatch_stop,
410 .show = blk_mq_debugfs_rq_show,
411};
412
413struct show_busy_params {
414 struct seq_file *m;
415 struct blk_mq_hw_ctx *hctx;
416};
417
418
419
420
421
422static void hctx_show_busy_rq(struct request *rq, void *data, bool reserved)
423{
424 const struct show_busy_params *params = data;
425
426 if (blk_mq_map_queue(rq->q, rq->mq_ctx->cpu) == params->hctx &&
427 blk_mq_rq_state(rq) != MQ_RQ_IDLE)
428 __blk_mq_debugfs_rq_show(params->m,
429 list_entry_rq(&rq->queuelist));
430}
431
432static int hctx_busy_show(void *data, struct seq_file *m)
433{
434 struct blk_mq_hw_ctx *hctx = data;
435 struct show_busy_params params = { .m = m, .hctx = hctx };
436
437 blk_mq_tagset_busy_iter(hctx->queue->tag_set, hctx_show_busy_rq,
438 ¶ms);
439
440 return 0;
441}
442
443static int hctx_ctx_map_show(void *data, struct seq_file *m)
444{
445 struct blk_mq_hw_ctx *hctx = data;
446
447 sbitmap_bitmap_show(&hctx->ctx_map, m);
448 return 0;
449}
450
451static void blk_mq_debugfs_tags_show(struct seq_file *m,
452 struct blk_mq_tags *tags)
453{
454 seq_printf(m, "nr_tags=%u\n", tags->nr_tags);
455 seq_printf(m, "nr_reserved_tags=%u\n", tags->nr_reserved_tags);
456 seq_printf(m, "active_queues=%d\n",
457 atomic_read(&tags->active_queues));
458
459 seq_puts(m, "\nbitmap_tags:\n");
460 sbitmap_queue_show(&tags->bitmap_tags, m);
461
462 if (tags->nr_reserved_tags) {
463 seq_puts(m, "\nbreserved_tags:\n");
464 sbitmap_queue_show(&tags->breserved_tags, m);
465 }
466}
467
468static int hctx_tags_show(void *data, struct seq_file *m)
469{
470 struct blk_mq_hw_ctx *hctx = data;
471 struct request_queue *q = hctx->queue;
472 int res;
473
474 res = mutex_lock_interruptible(&q->sysfs_lock);
475 if (res)
476 goto out;
477 if (hctx->tags)
478 blk_mq_debugfs_tags_show(m, hctx->tags);
479 mutex_unlock(&q->sysfs_lock);
480
481out:
482 return res;
483}
484
485static int hctx_tags_bitmap_show(void *data, struct seq_file *m)
486{
487 struct blk_mq_hw_ctx *hctx = data;
488 struct request_queue *q = hctx->queue;
489 int res;
490
491 res = mutex_lock_interruptible(&q->sysfs_lock);
492 if (res)
493 goto out;
494 if (hctx->tags)
495 sbitmap_bitmap_show(&hctx->tags->bitmap_tags.sb, m);
496 mutex_unlock(&q->sysfs_lock);
497
498out:
499 return res;
500}
501
502static int hctx_sched_tags_show(void *data, struct seq_file *m)
503{
504 struct blk_mq_hw_ctx *hctx = data;
505 struct request_queue *q = hctx->queue;
506 int res;
507
508 res = mutex_lock_interruptible(&q->sysfs_lock);
509 if (res)
510 goto out;
511 if (hctx->sched_tags)
512 blk_mq_debugfs_tags_show(m, hctx->sched_tags);
513 mutex_unlock(&q->sysfs_lock);
514
515out:
516 return res;
517}
518
519static int hctx_sched_tags_bitmap_show(void *data, struct seq_file *m)
520{
521 struct blk_mq_hw_ctx *hctx = data;
522 struct request_queue *q = hctx->queue;
523 int res;
524
525 res = mutex_lock_interruptible(&q->sysfs_lock);
526 if (res)
527 goto out;
528 if (hctx->sched_tags)
529 sbitmap_bitmap_show(&hctx->sched_tags->bitmap_tags.sb, m);
530 mutex_unlock(&q->sysfs_lock);
531
532out:
533 return res;
534}
535
536static int hctx_io_poll_show(void *data, struct seq_file *m)
537{
538 struct blk_mq_hw_ctx *hctx = data;
539
540 seq_printf(m, "considered=%lu\n", hctx->poll_considered);
541 seq_printf(m, "invoked=%lu\n", hctx->poll_invoked);
542 seq_printf(m, "success=%lu\n", hctx->poll_success);
543 return 0;
544}
545
546static ssize_t hctx_io_poll_write(void *data, const char __user *buf,
547 size_t count, loff_t *ppos)
548{
549 struct blk_mq_hw_ctx *hctx = data;
550
551 hctx->poll_considered = hctx->poll_invoked = hctx->poll_success = 0;
552 return count;
553}
554
555static int hctx_dispatched_show(void *data, struct seq_file *m)
556{
557 struct blk_mq_hw_ctx *hctx = data;
558 int i;
559
560 seq_printf(m, "%8u\t%lu\n", 0U, hctx->dispatched[0]);
561
562 for (i = 1; i < BLK_MQ_MAX_DISPATCH_ORDER - 1; i++) {
563 unsigned int d = 1U << (i - 1);
564
565 seq_printf(m, "%8u\t%lu\n", d, hctx->dispatched[i]);
566 }
567
568 seq_printf(m, "%8u+\t%lu\n", 1U << (i - 1), hctx->dispatched[i]);
569 return 0;
570}
571
572static ssize_t hctx_dispatched_write(void *data, const char __user *buf,
573 size_t count, loff_t *ppos)
574{
575 struct blk_mq_hw_ctx *hctx = data;
576 int i;
577
578 for (i = 0; i < BLK_MQ_MAX_DISPATCH_ORDER; i++)
579 hctx->dispatched[i] = 0;
580 return count;
581}
582
583static int hctx_queued_show(void *data, struct seq_file *m)
584{
585 struct blk_mq_hw_ctx *hctx = data;
586
587 seq_printf(m, "%lu\n", hctx->queued);
588 return 0;
589}
590
591static ssize_t hctx_queued_write(void *data, const char __user *buf,
592 size_t count, loff_t *ppos)
593{
594 struct blk_mq_hw_ctx *hctx = data;
595
596 hctx->queued = 0;
597 return count;
598}
599
600static int hctx_run_show(void *data, struct seq_file *m)
601{
602 struct blk_mq_hw_ctx *hctx = data;
603
604 seq_printf(m, "%lu\n", hctx->run);
605 return 0;
606}
607
608static ssize_t hctx_run_write(void *data, const char __user *buf, size_t count,
609 loff_t *ppos)
610{
611 struct blk_mq_hw_ctx *hctx = data;
612
613 hctx->run = 0;
614 return count;
615}
616
617static int hctx_active_show(void *data, struct seq_file *m)
618{
619 struct blk_mq_hw_ctx *hctx = data;
620
621 seq_printf(m, "%d\n", atomic_read(&hctx->nr_active));
622 return 0;
623}
624
625static int hctx_dispatch_busy_show(void *data, struct seq_file *m)
626{
627 struct blk_mq_hw_ctx *hctx = data;
628
629 seq_printf(m, "%u\n", hctx->dispatch_busy);
630 return 0;
631}
632
633static void *ctx_rq_list_start(struct seq_file *m, loff_t *pos)
634 __acquires(&ctx->lock)
635{
636 struct blk_mq_ctx *ctx = m->private;
637
638 spin_lock(&ctx->lock);
639 return seq_list_start(&ctx->rq_list, *pos);
640}
641
642static void *ctx_rq_list_next(struct seq_file *m, void *v, loff_t *pos)
643{
644 struct blk_mq_ctx *ctx = m->private;
645
646 return seq_list_next(v, &ctx->rq_list, pos);
647}
648
649static void ctx_rq_list_stop(struct seq_file *m, void *v)
650 __releases(&ctx->lock)
651{
652 struct blk_mq_ctx *ctx = m->private;
653
654 spin_unlock(&ctx->lock);
655}
656
657static const struct seq_operations ctx_rq_list_seq_ops = {
658 .start = ctx_rq_list_start,
659 .next = ctx_rq_list_next,
660 .stop = ctx_rq_list_stop,
661 .show = blk_mq_debugfs_rq_show,
662};
663static int ctx_dispatched_show(void *data, struct seq_file *m)
664{
665 struct blk_mq_ctx *ctx = data;
666
667 seq_printf(m, "%lu %lu\n", ctx->rq_dispatched[1], ctx->rq_dispatched[0]);
668 return 0;
669}
670
671static ssize_t ctx_dispatched_write(void *data, const char __user *buf,
672 size_t count, loff_t *ppos)
673{
674 struct blk_mq_ctx *ctx = data;
675
676 ctx->rq_dispatched[0] = ctx->rq_dispatched[1] = 0;
677 return count;
678}
679
680static int ctx_merged_show(void *data, struct seq_file *m)
681{
682 struct blk_mq_ctx *ctx = data;
683
684 seq_printf(m, "%lu\n", ctx->rq_merged);
685 return 0;
686}
687
688static ssize_t ctx_merged_write(void *data, const char __user *buf,
689 size_t count, loff_t *ppos)
690{
691 struct blk_mq_ctx *ctx = data;
692
693 ctx->rq_merged = 0;
694 return count;
695}
696
697static int ctx_completed_show(void *data, struct seq_file *m)
698{
699 struct blk_mq_ctx *ctx = data;
700
701 seq_printf(m, "%lu %lu\n", ctx->rq_completed[1], ctx->rq_completed[0]);
702 return 0;
703}
704
705static ssize_t ctx_completed_write(void *data, const char __user *buf,
706 size_t count, loff_t *ppos)
707{
708 struct blk_mq_ctx *ctx = data;
709
710 ctx->rq_completed[0] = ctx->rq_completed[1] = 0;
711 return count;
712}
713
714static int blk_mq_debugfs_show(struct seq_file *m, void *v)
715{
716 const struct blk_mq_debugfs_attr *attr = m->private;
717 void *data = d_inode(m->file->f_path.dentry->d_parent)->i_private;
718
719 return attr->show(data, m);
720}
721
722static ssize_t blk_mq_debugfs_write(struct file *file, const char __user *buf,
723 size_t count, loff_t *ppos)
724{
725 struct seq_file *m = file->private_data;
726 const struct blk_mq_debugfs_attr *attr = m->private;
727 void *data = d_inode(file->f_path.dentry->d_parent)->i_private;
728
729
730
731
732
733 if (attr == data || !attr->write)
734 return -EPERM;
735
736 return attr->write(data, buf, count, ppos);
737}
738
739static int blk_mq_debugfs_open(struct inode *inode, struct file *file)
740{
741 const struct blk_mq_debugfs_attr *attr = inode->i_private;
742 void *data = d_inode(file->f_path.dentry->d_parent)->i_private;
743 struct seq_file *m;
744 int ret;
745
746 if (attr->seq_ops) {
747 ret = seq_open(file, attr->seq_ops);
748 if (!ret) {
749 m = file->private_data;
750 m->private = data;
751 }
752 return ret;
753 }
754
755 if (WARN_ON_ONCE(!attr->show))
756 return -EPERM;
757
758 return single_open(file, blk_mq_debugfs_show, inode->i_private);
759}
760
761static int blk_mq_debugfs_release(struct inode *inode, struct file *file)
762{
763 const struct blk_mq_debugfs_attr *attr = inode->i_private;
764
765 if (attr->show)
766 return single_release(inode, file);
767 else
768 return seq_release(inode, file);
769}
770
771static const struct file_operations blk_mq_debugfs_fops = {
772 .open = blk_mq_debugfs_open,
773 .read = seq_read,
774 .write = blk_mq_debugfs_write,
775 .llseek = seq_lseek,
776 .release = blk_mq_debugfs_release,
777};
778
779static const struct blk_mq_debugfs_attr blk_mq_debugfs_hctx_attrs[] = {
780 {"state", 0400, hctx_state_show},
781 {"flags", 0400, hctx_flags_show},
782 {"dispatch", 0400, .seq_ops = &hctx_dispatch_seq_ops},
783 {"busy", 0400, hctx_busy_show},
784 {"ctx_map", 0400, hctx_ctx_map_show},
785 {"tags", 0400, hctx_tags_show},
786 {"tags_bitmap", 0400, hctx_tags_bitmap_show},
787 {"sched_tags", 0400, hctx_sched_tags_show},
788 {"sched_tags_bitmap", 0400, hctx_sched_tags_bitmap_show},
789 {"io_poll", 0600, hctx_io_poll_show, hctx_io_poll_write},
790 {"dispatched", 0600, hctx_dispatched_show, hctx_dispatched_write},
791 {"queued", 0600, hctx_queued_show, hctx_queued_write},
792 {"run", 0600, hctx_run_show, hctx_run_write},
793 {"active", 0400, hctx_active_show},
794 {"dispatch_busy", 0400, hctx_dispatch_busy_show},
795 {},
796};
797
798static const struct blk_mq_debugfs_attr blk_mq_debugfs_ctx_attrs[] = {
799 {"rq_list", 0400, .seq_ops = &ctx_rq_list_seq_ops},
800 {"dispatched", 0600, ctx_dispatched_show, ctx_dispatched_write},
801 {"merged", 0600, ctx_merged_show, ctx_merged_write},
802 {"completed", 0600, ctx_completed_show, ctx_completed_write},
803 {},
804};
805
806static bool debugfs_create_files(struct dentry *parent, void *data,
807 const struct blk_mq_debugfs_attr *attr)
808{
809 d_inode(parent)->i_private = data;
810
811 for (; attr->name; attr++) {
812 if (!debugfs_create_file(attr->name, attr->mode, parent,
813 (void *)attr, &blk_mq_debugfs_fops))
814 return false;
815 }
816 return true;
817}
818
819int blk_mq_debugfs_register(struct request_queue *q)
820{
821 struct blk_mq_hw_ctx *hctx;
822 int i;
823
824 if (!blk_debugfs_root)
825 return -ENOENT;
826
827 q->debugfs_dir = debugfs_create_dir(kobject_name(q->kobj.parent),
828 blk_debugfs_root);
829 if (!q->debugfs_dir)
830 return -ENOMEM;
831
832 if (!debugfs_create_files(q->debugfs_dir, q,
833 blk_mq_debugfs_queue_attrs))
834 goto err;
835
836
837
838
839
840
841 if (q->elevator && !q->sched_debugfs_dir)
842 blk_mq_debugfs_register_sched(q);
843
844
845 queue_for_each_hw_ctx(q, hctx, i) {
846 if (!hctx->debugfs_dir && blk_mq_debugfs_register_hctx(q, hctx))
847 goto err;
848 if (q->elevator && !hctx->sched_debugfs_dir &&
849 blk_mq_debugfs_register_sched_hctx(q, hctx))
850 goto err;
851 }
852
853 return 0;
854
855err:
856 blk_mq_debugfs_unregister(q);
857 return -ENOMEM;
858}
859
860void blk_mq_debugfs_unregister(struct request_queue *q)
861{
862 debugfs_remove_recursive(q->debugfs_dir);
863 q->sched_debugfs_dir = NULL;
864 q->debugfs_dir = NULL;
865}
866
867static int blk_mq_debugfs_register_ctx(struct blk_mq_hw_ctx *hctx,
868 struct blk_mq_ctx *ctx)
869{
870 struct dentry *ctx_dir;
871 char name[20];
872
873 snprintf(name, sizeof(name), "cpu%u", ctx->cpu);
874 ctx_dir = debugfs_create_dir(name, hctx->debugfs_dir);
875 if (!ctx_dir)
876 return -ENOMEM;
877
878 if (!debugfs_create_files(ctx_dir, ctx, blk_mq_debugfs_ctx_attrs))
879 return -ENOMEM;
880
881 return 0;
882}
883
884int blk_mq_debugfs_register_hctx(struct request_queue *q,
885 struct blk_mq_hw_ctx *hctx)
886{
887 struct blk_mq_ctx *ctx;
888 char name[20];
889 int i;
890
891 if (!q->debugfs_dir)
892 return -ENOENT;
893
894 snprintf(name, sizeof(name), "hctx%u", hctx->queue_num);
895 hctx->debugfs_dir = debugfs_create_dir(name, q->debugfs_dir);
896 if (!hctx->debugfs_dir)
897 return -ENOMEM;
898
899 if (!debugfs_create_files(hctx->debugfs_dir, hctx,
900 blk_mq_debugfs_hctx_attrs))
901 goto err;
902
903 hctx_for_each_ctx(hctx, ctx, i) {
904 if (blk_mq_debugfs_register_ctx(hctx, ctx))
905 goto err;
906 }
907
908 return 0;
909
910err:
911 blk_mq_debugfs_unregister_hctx(hctx);
912 return -ENOMEM;
913}
914
915void blk_mq_debugfs_unregister_hctx(struct blk_mq_hw_ctx *hctx)
916{
917 debugfs_remove_recursive(hctx->debugfs_dir);
918 hctx->sched_debugfs_dir = NULL;
919 hctx->debugfs_dir = NULL;
920}
921
922int blk_mq_debugfs_register_hctxs(struct request_queue *q)
923{
924 struct blk_mq_hw_ctx *hctx;
925 int i;
926
927 queue_for_each_hw_ctx(q, hctx, i) {
928 if (blk_mq_debugfs_register_hctx(q, hctx))
929 return -ENOMEM;
930 }
931
932 return 0;
933}
934
935void blk_mq_debugfs_unregister_hctxs(struct request_queue *q)
936{
937 struct blk_mq_hw_ctx *hctx;
938 int i;
939
940 queue_for_each_hw_ctx(q, hctx, i)
941 blk_mq_debugfs_unregister_hctx(hctx);
942}
943
944int blk_mq_debugfs_register_sched(struct request_queue *q)
945{
946 struct elevator_type *e = q->elevator->type;
947
948 if (!q->debugfs_dir)
949 return -ENOENT;
950
951 if (!e->queue_debugfs_attrs)
952 return 0;
953
954 q->sched_debugfs_dir = debugfs_create_dir("sched", q->debugfs_dir);
955 if (!q->sched_debugfs_dir)
956 return -ENOMEM;
957
958 if (!debugfs_create_files(q->sched_debugfs_dir, q,
959 e->queue_debugfs_attrs))
960 goto err;
961
962 return 0;
963
964err:
965 blk_mq_debugfs_unregister_sched(q);
966 return -ENOMEM;
967}
968
969void blk_mq_debugfs_unregister_sched(struct request_queue *q)
970{
971 debugfs_remove_recursive(q->sched_debugfs_dir);
972 q->sched_debugfs_dir = NULL;
973}
974
975int blk_mq_debugfs_register_sched_hctx(struct request_queue *q,
976 struct blk_mq_hw_ctx *hctx)
977{
978 struct elevator_type *e = q->elevator->type;
979
980 if (!hctx->debugfs_dir)
981 return -ENOENT;
982
983 if (!e->hctx_debugfs_attrs)
984 return 0;
985
986 hctx->sched_debugfs_dir = debugfs_create_dir("sched",
987 hctx->debugfs_dir);
988 if (!hctx->sched_debugfs_dir)
989 return -ENOMEM;
990
991 if (!debugfs_create_files(hctx->sched_debugfs_dir, hctx,
992 e->hctx_debugfs_attrs))
993 return -ENOMEM;
994
995 return 0;
996}
997
998void blk_mq_debugfs_unregister_sched_hctx(struct blk_mq_hw_ctx *hctx)
999{
1000 debugfs_remove_recursive(hctx->sched_debugfs_dir);
1001 hctx->sched_debugfs_dir = NULL;
1002}
1003
