1
2
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5
6#include <linux/kernel.h>
7#include <linux/blkdev.h>
8#include <linux/debugfs.h>
9
10#include <linux/blk-mq.h>
11#include "blk.h"
12#include "blk-mq.h"
13#include "blk-mq-debugfs.h"
14#include "blk-mq-sched.h"
15#include "blk-mq-tag.h"
16#include "blk-rq-qos.h"
17
18static void print_stat(struct seq_file *m, struct blk_rq_stat *stat)
19{
20 if (stat->nr_samples) {
21 seq_printf(m, "samples=%d, mean=%llu, min=%llu, max=%llu",
22 stat->nr_samples, stat->mean, stat->min, stat->max);
23 } else {
24 seq_puts(m, "samples=0");
25 }
26}
27
28static int queue_poll_stat_show(void *data, struct seq_file *m)
29{
30 struct request_queue *q = data;
31 int bucket;
32
33 if (!q->poll_stat)
34 return 0;
35
36 for (bucket = 0; bucket < (BLK_MQ_POLL_STATS_BKTS / 2); bucket++) {
37 seq_printf(m, "read (%d Bytes): ", 1 << (9 + bucket));
38 print_stat(m, &q->poll_stat[2 * bucket]);
39 seq_puts(m, "\n");
40
41 seq_printf(m, "write (%d Bytes): ", 1 << (9 + bucket));
42 print_stat(m, &q->poll_stat[2 * bucket + 1]);
43 seq_puts(m, "\n");
44 }
45 return 0;
46}
47
48static void *queue_requeue_list_start(struct seq_file *m, loff_t *pos)
49 __acquires(&q->requeue_lock)
50{
51 struct request_queue *q = m->private;
52
53 spin_lock_irq(&q->requeue_lock);
54 return seq_list_start(&q->requeue_list, *pos);
55}
56
57static void *queue_requeue_list_next(struct seq_file *m, void *v, loff_t *pos)
58{
59 struct request_queue *q = m->private;
60
61 return seq_list_next(v, &q->requeue_list, pos);
62}
63
64static void queue_requeue_list_stop(struct seq_file *m, void *v)
65 __releases(&q->requeue_lock)
66{
67 struct request_queue *q = m->private;
68
69 spin_unlock_irq(&q->requeue_lock);
70}
71
72static const struct seq_operations queue_requeue_list_seq_ops = {
73 .start = queue_requeue_list_start,
74 .next = queue_requeue_list_next,
75 .stop = queue_requeue_list_stop,
76 .show = blk_mq_debugfs_rq_show,
77};
78
79static int blk_flags_show(struct seq_file *m, const unsigned long flags,
80 const char *const *flag_name, int flag_name_count)
81{
82 bool sep = false;
83 int i;
84
85 for (i = 0; i < sizeof(flags) * BITS_PER_BYTE; i++) {
86 if (!(flags & BIT(i)))
87 continue;
88 if (sep)
89 seq_puts(m, "|");
90 sep = true;
91 if (i < flag_name_count && flag_name[i])
92 seq_puts(m, flag_name[i]);
93 else
94 seq_printf(m, "%d", i);
95 }
96 return 0;
97}
98
99static int queue_pm_only_show(void *data, struct seq_file *m)
100{
101 struct request_queue *q = data;
102
103 seq_printf(m, "%d\n", atomic_read(&q->pm_only));
104 return 0;
105}
106
107#define QUEUE_FLAG_NAME(name) [QUEUE_FLAG_##name] = #name
108static const char *const blk_queue_flag_name[] = {
109 QUEUE_FLAG_NAME(STOPPED),
110 QUEUE_FLAG_NAME(DYING),
111 QUEUE_FLAG_NAME(NOMERGES),
112 QUEUE_FLAG_NAME(SAME_COMP),
113 QUEUE_FLAG_NAME(FAIL_IO),
114 QUEUE_FLAG_NAME(NONROT),
115 QUEUE_FLAG_NAME(IO_STAT),
116 QUEUE_FLAG_NAME(DISCARD),
117 QUEUE_FLAG_NAME(NOXMERGES),
118 QUEUE_FLAG_NAME(ADD_RANDOM),
119 QUEUE_FLAG_NAME(SECERASE),
120 QUEUE_FLAG_NAME(SAME_FORCE),
121 QUEUE_FLAG_NAME(DEAD),
122 QUEUE_FLAG_NAME(INIT_DONE),
123 QUEUE_FLAG_NAME(STABLE_WRITES),
124 QUEUE_FLAG_NAME(POLL),
125 QUEUE_FLAG_NAME(WC),
126 QUEUE_FLAG_NAME(FUA),
127 QUEUE_FLAG_NAME(DAX),
128 QUEUE_FLAG_NAME(STATS),
129 QUEUE_FLAG_NAME(REGISTERED),
130 QUEUE_FLAG_NAME(QUIESCED),
131 QUEUE_FLAG_NAME(PCI_P2PDMA),
132 QUEUE_FLAG_NAME(ZONE_RESETALL),
133 QUEUE_FLAG_NAME(RQ_ALLOC_TIME),
134 QUEUE_FLAG_NAME(HCTX_ACTIVE),
135 QUEUE_FLAG_NAME(NOWAIT),
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 { "pm_only", 0600, queue_pm_only_show, NULL },
213 { "state", 0600, queue_state_show, queue_state_write },
214 { "write_hints", 0600, queue_write_hint_show, queue_write_hint_store },
215 { "zone_wlock", 0400, queue_zone_wlock_show, NULL },
216 { },
217};
218
219#define HCTX_STATE_NAME(name) [BLK_MQ_S_##name] = #name
220static const char *const hctx_state_name[] = {
221 HCTX_STATE_NAME(STOPPED),
222 HCTX_STATE_NAME(TAG_ACTIVE),
223 HCTX_STATE_NAME(SCHED_RESTART),
224 HCTX_STATE_NAME(INACTIVE),
225};
226#undef HCTX_STATE_NAME
227
228static int hctx_state_show(void *data, struct seq_file *m)
229{
230 struct blk_mq_hw_ctx *hctx = data;
231
232 blk_flags_show(m, hctx->state, hctx_state_name,
233 ARRAY_SIZE(hctx_state_name));
234 seq_puts(m, "\n");
235 return 0;
236}
237
238#define BLK_TAG_ALLOC_NAME(name) [BLK_TAG_ALLOC_##name] = #name
239static const char *const alloc_policy_name[] = {
240 BLK_TAG_ALLOC_NAME(FIFO),
241 BLK_TAG_ALLOC_NAME(RR),
242};
243#undef BLK_TAG_ALLOC_NAME
244
245#define HCTX_FLAG_NAME(name) [ilog2(BLK_MQ_F_##name)] = #name
246static const char *const hctx_flag_name[] = {
247 HCTX_FLAG_NAME(SHOULD_MERGE),
248 HCTX_FLAG_NAME(TAG_QUEUE_SHARED),
249 HCTX_FLAG_NAME(BLOCKING),
250 HCTX_FLAG_NAME(NO_SCHED),
251 HCTX_FLAG_NAME(STACKING),
252 HCTX_FLAG_NAME(TAG_HCTX_SHARED),
253};
254#undef HCTX_FLAG_NAME
255
256static int hctx_flags_show(void *data, struct seq_file *m)
257{
258 struct blk_mq_hw_ctx *hctx = data;
259 const int alloc_policy = BLK_MQ_FLAG_TO_ALLOC_POLICY(hctx->flags);
260
261 seq_puts(m, "alloc_policy=");
262 if (alloc_policy < ARRAY_SIZE(alloc_policy_name) &&
263 alloc_policy_name[alloc_policy])
264 seq_puts(m, alloc_policy_name[alloc_policy]);
265 else
266 seq_printf(m, "%d", alloc_policy);
267 seq_puts(m, " ");
268 blk_flags_show(m,
269 hctx->flags ^ BLK_ALLOC_POLICY_TO_MQ_FLAG(alloc_policy),
270 hctx_flag_name, ARRAY_SIZE(hctx_flag_name));
271 seq_puts(m, "\n");
272 return 0;
273}
274
275#define CMD_FLAG_NAME(name) [__REQ_##name] = #name
276static const char *const cmd_flag_name[] = {
277 CMD_FLAG_NAME(FAILFAST_DEV),
278 CMD_FLAG_NAME(FAILFAST_TRANSPORT),
279 CMD_FLAG_NAME(FAILFAST_DRIVER),
280 CMD_FLAG_NAME(SYNC),
281 CMD_FLAG_NAME(META),
282 CMD_FLAG_NAME(PRIO),
283 CMD_FLAG_NAME(NOMERGE),
284 CMD_FLAG_NAME(IDLE),
285 CMD_FLAG_NAME(INTEGRITY),
286 CMD_FLAG_NAME(FUA),
287 CMD_FLAG_NAME(PREFLUSH),
288 CMD_FLAG_NAME(RAHEAD),
289 CMD_FLAG_NAME(BACKGROUND),
290 CMD_FLAG_NAME(NOWAIT),
291 CMD_FLAG_NAME(NOUNMAP),
292 CMD_FLAG_NAME(POLLED),
293};
294#undef CMD_FLAG_NAME
295
296#define RQF_NAME(name) [ilog2((__force u32)RQF_##name)] = #name
297static const char *const rqf_name[] = {
298 RQF_NAME(STARTED),
299 RQF_NAME(SOFTBARRIER),
300 RQF_NAME(FLUSH_SEQ),
301 RQF_NAME(MIXED_MERGE),
302 RQF_NAME(MQ_INFLIGHT),
303 RQF_NAME(DONTPREP),
304 RQF_NAME(FAILED),
305 RQF_NAME(QUIET),
306 RQF_NAME(ELVPRIV),
307 RQF_NAME(IO_STAT),
308 RQF_NAME(PM),
309 RQF_NAME(HASHED),
310 RQF_NAME(STATS),
311 RQF_NAME(SPECIAL_PAYLOAD),
312 RQF_NAME(ZONE_WRITE_LOCKED),
313 RQF_NAME(MQ_POLL_SLEPT),
314 RQF_NAME(ELV),
315};
316#undef RQF_NAME
317
318static const char *const blk_mq_rq_state_name_array[] = {
319 [MQ_RQ_IDLE] = "idle",
320 [MQ_RQ_IN_FLIGHT] = "in_flight",
321 [MQ_RQ_COMPLETE] = "complete",
322};
323
324static const char *blk_mq_rq_state_name(enum mq_rq_state rq_state)
325{
326 if (WARN_ON_ONCE((unsigned int)rq_state >=
327 ARRAY_SIZE(blk_mq_rq_state_name_array)))
328 return "(?)";
329 return blk_mq_rq_state_name_array[rq_state];
330}
331
332int __blk_mq_debugfs_rq_show(struct seq_file *m, struct request *rq)
333{
334 const struct blk_mq_ops *const mq_ops = rq->q->mq_ops;
335 const unsigned int op = req_op(rq);
336 const char *op_str = blk_op_str(op);
337
338 seq_printf(m, "%p {.op=", rq);
339 if (strcmp(op_str, "UNKNOWN") == 0)
340 seq_printf(m, "%u", op);
341 else
342 seq_printf(m, "%s", op_str);
343 seq_puts(m, ", .cmd_flags=");
344 blk_flags_show(m, rq->cmd_flags & ~REQ_OP_MASK, cmd_flag_name,
345 ARRAY_SIZE(cmd_flag_name));
346 seq_puts(m, ", .rq_flags=");
347 blk_flags_show(m, (__force unsigned int)rq->rq_flags, rqf_name,
348 ARRAY_SIZE(rqf_name));
349 seq_printf(m, ", .state=%s", blk_mq_rq_state_name(blk_mq_rq_state(rq)));
350 seq_printf(m, ", .tag=%d, .internal_tag=%d", rq->tag,
351 rq->internal_tag);
352 if (mq_ops->show_rq)
353 mq_ops->show_rq(m, rq);
354 seq_puts(m, "}\n");
355 return 0;
356}
357EXPORT_SYMBOL_GPL(__blk_mq_debugfs_rq_show);
358
359int blk_mq_debugfs_rq_show(struct seq_file *m, void *v)
360{
361 return __blk_mq_debugfs_rq_show(m, list_entry_rq(v));
362}
363EXPORT_SYMBOL_GPL(blk_mq_debugfs_rq_show);
364
365static void *hctx_dispatch_start(struct seq_file *m, loff_t *pos)
366 __acquires(&hctx->lock)
367{
368 struct blk_mq_hw_ctx *hctx = m->private;
369
370 spin_lock(&hctx->lock);
371 return seq_list_start(&hctx->dispatch, *pos);
372}
373
374static void *hctx_dispatch_next(struct seq_file *m, void *v, loff_t *pos)
375{
376 struct blk_mq_hw_ctx *hctx = m->private;
377
378 return seq_list_next(v, &hctx->dispatch, pos);
379}
380
381static void hctx_dispatch_stop(struct seq_file *m, void *v)
382 __releases(&hctx->lock)
383{
384 struct blk_mq_hw_ctx *hctx = m->private;
385
386 spin_unlock(&hctx->lock);
387}
388
389static const struct seq_operations hctx_dispatch_seq_ops = {
390 .start = hctx_dispatch_start,
391 .next = hctx_dispatch_next,
392 .stop = hctx_dispatch_stop,
393 .show = blk_mq_debugfs_rq_show,
394};
395
396struct show_busy_params {
397 struct seq_file *m;
398 struct blk_mq_hw_ctx *hctx;
399};
400
401
402
403
404
405
406static bool hctx_show_busy_rq(struct request *rq, void *data, bool reserved)
407{
408 const struct show_busy_params *params = data;
409
410 if (rq->mq_hctx == params->hctx)
411 __blk_mq_debugfs_rq_show(params->m, rq);
412
413 return true;
414}
415
416static int hctx_busy_show(void *data, struct seq_file *m)
417{
418 struct blk_mq_hw_ctx *hctx = data;
419 struct show_busy_params params = { .m = m, .hctx = hctx };
420
421 blk_mq_tagset_busy_iter(hctx->queue->tag_set, hctx_show_busy_rq,
422 ¶ms);
423
424 return 0;
425}
426
427static const char *const hctx_types[] = {
428 [HCTX_TYPE_DEFAULT] = "default",
429 [HCTX_TYPE_READ] = "read",
430 [HCTX_TYPE_POLL] = "poll",
431};
432
433static int hctx_type_show(void *data, struct seq_file *m)
434{
435 struct blk_mq_hw_ctx *hctx = data;
436
437 BUILD_BUG_ON(ARRAY_SIZE(hctx_types) != HCTX_MAX_TYPES);
438 seq_printf(m, "%s\n", hctx_types[hctx->type]);
439 return 0;
440}
441
442static int hctx_ctx_map_show(void *data, struct seq_file *m)
443{
444 struct blk_mq_hw_ctx *hctx = data;
445
446 sbitmap_bitmap_show(&hctx->ctx_map, m);
447 return 0;
448}
449
450static void blk_mq_debugfs_tags_show(struct seq_file *m,
451 struct blk_mq_tags *tags)
452{
453 seq_printf(m, "nr_tags=%u\n", tags->nr_tags);
454 seq_printf(m, "nr_reserved_tags=%u\n", tags->nr_reserved_tags);
455 seq_printf(m, "active_queues=%d\n",
456 atomic_read(&tags->active_queues));
457
458 seq_puts(m, "\nbitmap_tags:\n");
459 sbitmap_queue_show(&tags->bitmap_tags, m);
460
461 if (tags->nr_reserved_tags) {
462 seq_puts(m, "\nbreserved_tags:\n");
463 sbitmap_queue_show(&tags->breserved_tags, m);
464 }
465}
466
467static int hctx_tags_show(void *data, struct seq_file *m)
468{
469 struct blk_mq_hw_ctx *hctx = data;
470 struct request_queue *q = hctx->queue;
471 int res;
472
473 res = mutex_lock_interruptible(&q->sysfs_lock);
474 if (res)
475 goto out;
476 if (hctx->tags)
477 blk_mq_debugfs_tags_show(m, hctx->tags);
478 mutex_unlock(&q->sysfs_lock);
479
480out:
481 return res;
482}
483
484static int hctx_tags_bitmap_show(void *data, struct seq_file *m)
485{
486 struct blk_mq_hw_ctx *hctx = data;
487 struct request_queue *q = hctx->queue;
488 int res;
489
490 res = mutex_lock_interruptible(&q->sysfs_lock);
491 if (res)
492 goto out;
493 if (hctx->tags)
494 sbitmap_bitmap_show(&hctx->tags->bitmap_tags.sb, m);
495 mutex_unlock(&q->sysfs_lock);
496
497out:
498 return res;
499}
500
501static int hctx_sched_tags_show(void *data, struct seq_file *m)
502{
503 struct blk_mq_hw_ctx *hctx = data;
504 struct request_queue *q = hctx->queue;
505 int res;
506
507 res = mutex_lock_interruptible(&q->sysfs_lock);
508 if (res)
509 goto out;
510 if (hctx->sched_tags)
511 blk_mq_debugfs_tags_show(m, hctx->sched_tags);
512 mutex_unlock(&q->sysfs_lock);
513
514out:
515 return res;
516}
517
518static int hctx_sched_tags_bitmap_show(void *data, struct seq_file *m)
519{
520 struct blk_mq_hw_ctx *hctx = data;
521 struct request_queue *q = hctx->queue;
522 int res;
523
524 res = mutex_lock_interruptible(&q->sysfs_lock);
525 if (res)
526 goto out;
527 if (hctx->sched_tags)
528 sbitmap_bitmap_show(&hctx->sched_tags->bitmap_tags.sb, m);
529 mutex_unlock(&q->sysfs_lock);
530
531out:
532 return res;
533}
534
535static int hctx_run_show(void *data, struct seq_file *m)
536{
537 struct blk_mq_hw_ctx *hctx = data;
538
539 seq_printf(m, "%lu\n", hctx->run);
540 return 0;
541}
542
543static ssize_t hctx_run_write(void *data, const char __user *buf, size_t count,
544 loff_t *ppos)
545{
546 struct blk_mq_hw_ctx *hctx = data;
547
548 hctx->run = 0;
549 return count;
550}
551
552static int hctx_active_show(void *data, struct seq_file *m)
553{
554 struct blk_mq_hw_ctx *hctx = data;
555
556 seq_printf(m, "%d\n", __blk_mq_active_requests(hctx));
557 return 0;
558}
559
560static int hctx_dispatch_busy_show(void *data, struct seq_file *m)
561{
562 struct blk_mq_hw_ctx *hctx = data;
563
564 seq_printf(m, "%u\n", hctx->dispatch_busy);
565 return 0;
566}
567
568#define CTX_RQ_SEQ_OPS(name, type) \
569static void *ctx_##name##_rq_list_start(struct seq_file *m, loff_t *pos) \
570 __acquires(&ctx->lock) \
571{ \
572 struct blk_mq_ctx *ctx = m->private; \
573 \
574 spin_lock(&ctx->lock); \
575 return seq_list_start(&ctx->rq_lists[type], *pos); \
576} \
577 \
578static void *ctx_##name##_rq_list_next(struct seq_file *m, void *v, \
579 loff_t *pos) \
580{ \
581 struct blk_mq_ctx *ctx = m->private; \
582 \
583 return seq_list_next(v, &ctx->rq_lists[type], pos); \
584} \
585 \
586static void ctx_##name##_rq_list_stop(struct seq_file *m, void *v) \
587 __releases(&ctx->lock) \
588{ \
589 struct blk_mq_ctx *ctx = m->private; \
590 \
591 spin_unlock(&ctx->lock); \
592} \
593 \
594static const struct seq_operations ctx_##name##_rq_list_seq_ops = { \
595 .start = ctx_##name##_rq_list_start, \
596 .next = ctx_##name##_rq_list_next, \
597 .stop = ctx_##name##_rq_list_stop, \
598 .show = blk_mq_debugfs_rq_show, \
599}
600
601CTX_RQ_SEQ_OPS(default, HCTX_TYPE_DEFAULT);
602CTX_RQ_SEQ_OPS(read, HCTX_TYPE_READ);
603CTX_RQ_SEQ_OPS(poll, HCTX_TYPE_POLL);
604
605static int blk_mq_debugfs_show(struct seq_file *m, void *v)
606{
607 const struct blk_mq_debugfs_attr *attr = m->private;
608 void *data = d_inode(m->file->f_path.dentry->d_parent)->i_private;
609
610 return attr->show(data, m);
611}
612
613static ssize_t blk_mq_debugfs_write(struct file *file, const char __user *buf,
614 size_t count, loff_t *ppos)
615{
616 struct seq_file *m = file->private_data;
617 const struct blk_mq_debugfs_attr *attr = m->private;
618 void *data = d_inode(file->f_path.dentry->d_parent)->i_private;
619
620
621
622
623
624 if (attr == data || !attr->write)
625 return -EPERM;
626
627 return attr->write(data, buf, count, ppos);
628}
629
630static int blk_mq_debugfs_open(struct inode *inode, struct file *file)
631{
632 const struct blk_mq_debugfs_attr *attr = inode->i_private;
633 void *data = d_inode(file->f_path.dentry->d_parent)->i_private;
634 struct seq_file *m;
635 int ret;
636
637 if (attr->seq_ops) {
638 ret = seq_open(file, attr->seq_ops);
639 if (!ret) {
640 m = file->private_data;
641 m->private = data;
642 }
643 return ret;
644 }
645
646 if (WARN_ON_ONCE(!attr->show))
647 return -EPERM;
648
649 return single_open(file, blk_mq_debugfs_show, inode->i_private);
650}
651
652static int blk_mq_debugfs_release(struct inode *inode, struct file *file)
653{
654 const struct blk_mq_debugfs_attr *attr = inode->i_private;
655
656 if (attr->show)
657 return single_release(inode, file);
658
659 return seq_release(inode, file);
660}
661
662static const struct file_operations blk_mq_debugfs_fops = {
663 .open = blk_mq_debugfs_open,
664 .read = seq_read,
665 .write = blk_mq_debugfs_write,
666 .llseek = seq_lseek,
667 .release = blk_mq_debugfs_release,
668};
669
670static const struct blk_mq_debugfs_attr blk_mq_debugfs_hctx_attrs[] = {
671 {"state", 0400, hctx_state_show},
672 {"flags", 0400, hctx_flags_show},
673 {"dispatch", 0400, .seq_ops = &hctx_dispatch_seq_ops},
674 {"busy", 0400, hctx_busy_show},
675 {"ctx_map", 0400, hctx_ctx_map_show},
676 {"tags", 0400, hctx_tags_show},
677 {"tags_bitmap", 0400, hctx_tags_bitmap_show},
678 {"sched_tags", 0400, hctx_sched_tags_show},
679 {"sched_tags_bitmap", 0400, hctx_sched_tags_bitmap_show},
680 {"run", 0600, hctx_run_show, hctx_run_write},
681 {"active", 0400, hctx_active_show},
682 {"dispatch_busy", 0400, hctx_dispatch_busy_show},
683 {"type", 0400, hctx_type_show},
684 {},
685};
686
687static const struct blk_mq_debugfs_attr blk_mq_debugfs_ctx_attrs[] = {
688 {"default_rq_list", 0400, .seq_ops = &ctx_default_rq_list_seq_ops},
689 {"read_rq_list", 0400, .seq_ops = &ctx_read_rq_list_seq_ops},
690 {"poll_rq_list", 0400, .seq_ops = &ctx_poll_rq_list_seq_ops},
691 {},
692};
693
694static void debugfs_create_files(struct dentry *parent, void *data,
695 const struct blk_mq_debugfs_attr *attr)
696{
697 if (IS_ERR_OR_NULL(parent))
698 return;
699
700 d_inode(parent)->i_private = data;
701
702 for (; attr->name; attr++)
703 debugfs_create_file(attr->name, attr->mode, parent,
704 (void *)attr, &blk_mq_debugfs_fops);
705}
706
707void blk_mq_debugfs_register(struct request_queue *q)
708{
709 struct blk_mq_hw_ctx *hctx;
710 int i;
711
712 debugfs_create_files(q->debugfs_dir, q, blk_mq_debugfs_queue_attrs);
713
714
715
716
717
718
719 if (q->elevator && !q->sched_debugfs_dir)
720 blk_mq_debugfs_register_sched(q);
721
722
723 queue_for_each_hw_ctx(q, hctx, i) {
724 if (!hctx->debugfs_dir)
725 blk_mq_debugfs_register_hctx(q, hctx);
726 if (q->elevator && !hctx->sched_debugfs_dir)
727 blk_mq_debugfs_register_sched_hctx(q, hctx);
728 }
729
730 if (q->rq_qos) {
731 struct rq_qos *rqos = q->rq_qos;
732
733 while (rqos) {
734 blk_mq_debugfs_register_rqos(rqos);
735 rqos = rqos->next;
736 }
737 }
738}
739
740void blk_mq_debugfs_unregister(struct request_queue *q)
741{
742 q->sched_debugfs_dir = NULL;
743}
744
745static void blk_mq_debugfs_register_ctx(struct blk_mq_hw_ctx *hctx,
746 struct blk_mq_ctx *ctx)
747{
748 struct dentry *ctx_dir;
749 char name[20];
750
751 snprintf(name, sizeof(name), "cpu%u", ctx->cpu);
752 ctx_dir = debugfs_create_dir(name, hctx->debugfs_dir);
753
754 debugfs_create_files(ctx_dir, ctx, blk_mq_debugfs_ctx_attrs);
755}
756
757void blk_mq_debugfs_register_hctx(struct request_queue *q,
758 struct blk_mq_hw_ctx *hctx)
759{
760 struct blk_mq_ctx *ctx;
761 char name[20];
762 int i;
763
764 snprintf(name, sizeof(name), "hctx%u", hctx->queue_num);
765 hctx->debugfs_dir = debugfs_create_dir(name, q->debugfs_dir);
766
767 debugfs_create_files(hctx->debugfs_dir, hctx, blk_mq_debugfs_hctx_attrs);
768
769 hctx_for_each_ctx(hctx, ctx, i)
770 blk_mq_debugfs_register_ctx(hctx, ctx);
771}
772
773void blk_mq_debugfs_unregister_hctx(struct blk_mq_hw_ctx *hctx)
774{
775 debugfs_remove_recursive(hctx->debugfs_dir);
776 hctx->sched_debugfs_dir = NULL;
777 hctx->debugfs_dir = NULL;
778}
779
780void blk_mq_debugfs_register_hctxs(struct request_queue *q)
781{
782 struct blk_mq_hw_ctx *hctx;
783 int i;
784
785 queue_for_each_hw_ctx(q, hctx, i)
786 blk_mq_debugfs_register_hctx(q, hctx);
787}
788
789void blk_mq_debugfs_unregister_hctxs(struct request_queue *q)
790{
791 struct blk_mq_hw_ctx *hctx;
792 int i;
793
794 queue_for_each_hw_ctx(q, hctx, i)
795 blk_mq_debugfs_unregister_hctx(hctx);
796}
797
798void blk_mq_debugfs_register_sched(struct request_queue *q)
799{
800 struct elevator_type *e = q->elevator->type;
801
802
803
804
805
806 if (!q->debugfs_dir)
807 return;
808
809 if (!e->queue_debugfs_attrs)
810 return;
811
812 q->sched_debugfs_dir = debugfs_create_dir("sched", q->debugfs_dir);
813
814 debugfs_create_files(q->sched_debugfs_dir, q, e->queue_debugfs_attrs);
815}
816
817void blk_mq_debugfs_unregister_sched(struct request_queue *q)
818{
819 debugfs_remove_recursive(q->sched_debugfs_dir);
820 q->sched_debugfs_dir = NULL;
821}
822
823static const char *rq_qos_id_to_name(enum rq_qos_id id)
824{
825 switch (id) {
826 case RQ_QOS_WBT:
827 return "wbt";
828 case RQ_QOS_LATENCY:
829 return "latency";
830 case RQ_QOS_COST:
831 return "cost";
832 case RQ_QOS_IOPRIO:
833 return "ioprio";
834 }
835 return "unknown";
836}
837
838void blk_mq_debugfs_unregister_rqos(struct rq_qos *rqos)
839{
840 debugfs_remove_recursive(rqos->debugfs_dir);
841 rqos->debugfs_dir = NULL;
842}
843
844void blk_mq_debugfs_register_rqos(struct rq_qos *rqos)
845{
846 struct request_queue *q = rqos->q;
847 const char *dir_name = rq_qos_id_to_name(rqos->id);
848
849 if (rqos->debugfs_dir || !rqos->ops->debugfs_attrs)
850 return;
851
852 if (!q->rqos_debugfs_dir)
853 q->rqos_debugfs_dir = debugfs_create_dir("rqos",
854 q->debugfs_dir);
855
856 rqos->debugfs_dir = debugfs_create_dir(dir_name,
857 rqos->q->rqos_debugfs_dir);
858
859 debugfs_create_files(rqos->debugfs_dir, rqos, rqos->ops->debugfs_attrs);
860}
861
862void blk_mq_debugfs_unregister_queue_rqos(struct request_queue *q)
863{
864 debugfs_remove_recursive(q->rqos_debugfs_dir);
865 q->rqos_debugfs_dir = NULL;
866}
867
868void blk_mq_debugfs_register_sched_hctx(struct request_queue *q,
869 struct blk_mq_hw_ctx *hctx)
870{
871 struct elevator_type *e = q->elevator->type;
872
873
874
875
876
877
878 if (!hctx->debugfs_dir)
879 return;
880
881 if (!e->hctx_debugfs_attrs)
882 return;
883
884 hctx->sched_debugfs_dir = debugfs_create_dir("sched",
885 hctx->debugfs_dir);
886 debugfs_create_files(hctx->sched_debugfs_dir, hctx,
887 e->hctx_debugfs_attrs);
888}
889
890void blk_mq_debugfs_unregister_sched_hctx(struct blk_mq_hw_ctx *hctx)
891{
892 debugfs_remove_recursive(hctx->sched_debugfs_dir);
893 hctx->sched_debugfs_dir = NULL;
894}
895
