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Linux/block/blk-mq-debugfs.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * Copyright (C) 2017 Facebook
  4  */
  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-tag.h"
 15 #include "blk-rq-qos.h"
 16 
 17 static void print_stat(struct seq_file *m, struct blk_rq_stat *stat)
 18 {
 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);
 22         } else {
 23                 seq_puts(m, "samples=0");
 24         }
 25 }
 26 
 27 static int queue_poll_stat_show(void *data, struct seq_file *m)
 28 {
 29         struct request_queue *q = data;
 30         int bucket;
 31 
 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]);
 35                 seq_puts(m, "\n");
 36 
 37                 seq_printf(m, "write (%d Bytes): ",  1 << (9 + bucket));
 38                 print_stat(m, &q->poll_stat[2 * bucket + 1]);
 39                 seq_puts(m, "\n");
 40         }
 41         return 0;
 42 }
 43 
 44 static void *queue_requeue_list_start(struct seq_file *m, loff_t *pos)
 45         __acquires(&q->requeue_lock)
 46 {
 47         struct request_queue *q = m->private;
 48 
 49         spin_lock_irq(&q->requeue_lock);
 50         return seq_list_start(&q->requeue_list, *pos);
 51 }
 52 
 53 static void *queue_requeue_list_next(struct seq_file *m, void *v, loff_t *pos)
 54 {
 55         struct request_queue *q = m->private;
 56 
 57         return seq_list_next(v, &q->requeue_list, pos);
 58 }
 59 
 60 static void queue_requeue_list_stop(struct seq_file *m, void *v)
 61         __releases(&q->requeue_lock)
 62 {
 63         struct request_queue *q = m->private;
 64 
 65         spin_unlock_irq(&q->requeue_lock);
 66 }
 67 
 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,
 73 };
 74 
 75 static int blk_flags_show(struct seq_file *m, const unsigned long flags,
 76                           const char *const *flag_name, int flag_name_count)
 77 {
 78         bool sep = false;
 79         int i;
 80 
 81         for (i = 0; i < sizeof(flags) * BITS_PER_BYTE; i++) {
 82                 if (!(flags & BIT(i)))
 83                         continue;
 84                 if (sep)
 85                         seq_puts(m, "|");
 86                 sep = true;
 87                 if (i < flag_name_count && flag_name[i])
 88                         seq_puts(m, flag_name[i]);
 89                 else
 90                         seq_printf(m, "%d", i);
 91         }
 92         return 0;
 93 }
 94 
 95 static int queue_pm_only_show(void *data, struct seq_file *m)
 96 {
 97         struct request_queue *q = data;
 98 
 99         seq_printf(m, "%d\n", atomic_read(&q->pm_only));
100         return 0;
101 }
102 
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(POLL),
120         QUEUE_FLAG_NAME(WC),
121         QUEUE_FLAG_NAME(FUA),
122         QUEUE_FLAG_NAME(DAX),
123         QUEUE_FLAG_NAME(STATS),
124         QUEUE_FLAG_NAME(POLL_STATS),
125         QUEUE_FLAG_NAME(REGISTERED),
126         QUEUE_FLAG_NAME(SCSI_PASSTHROUGH),
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 };
132 #undef QUEUE_FLAG_NAME
133 
134 static int queue_state_show(void *data, struct seq_file *m)
135 {
136         struct request_queue *q = data;
137 
138         blk_flags_show(m, q->queue_flags, blk_queue_flag_name,
139                        ARRAY_SIZE(blk_queue_flag_name));
140         seq_puts(m, "\n");
141         return 0;
142 }
143 
144 static ssize_t queue_state_write(void *data, const char __user *buf,
145                                  size_t count, loff_t *ppos)
146 {
147         struct request_queue *q = data;
148         char opbuf[16] = { }, *op;
149 
150         /*
151          * The "state" attribute is removed after blk_cleanup_queue() has called
152          * blk_mq_free_queue(). Return if QUEUE_FLAG_DEAD has been set to avoid
153          * triggering a use-after-free.
154          */
155         if (blk_queue_dead(q))
156                 return -ENOENT;
157 
158         if (count >= sizeof(opbuf)) {
159                 pr_err("%s: operation too long\n", __func__);
160                 goto inval;
161         }
162 
163         if (copy_from_user(opbuf, buf, count))
164                 return -EFAULT;
165         op = strstrip(opbuf);
166         if (strcmp(op, "run") == 0) {
167                 blk_mq_run_hw_queues(q, true);
168         } else if (strcmp(op, "start") == 0) {
169                 blk_mq_start_stopped_hw_queues(q, true);
170         } else if (strcmp(op, "kick") == 0) {
171                 blk_mq_kick_requeue_list(q);
172         } else {
173                 pr_err("%s: unsupported operation '%s'\n", __func__, op);
174 inval:
175                 pr_err("%s: use 'run', 'start' or 'kick'\n", __func__);
176                 return -EINVAL;
177         }
178         return count;
179 }
180 
181 static int queue_write_hint_show(void *data, struct seq_file *m)
182 {
183         struct request_queue *q = data;
184         int i;
185 
186         for (i = 0; i < BLK_MAX_WRITE_HINTS; i++)
187                 seq_printf(m, "hint%d: %llu\n", i, q->write_hints[i]);
188 
189         return 0;
190 }
191 
192 static ssize_t queue_write_hint_store(void *data, const char __user *buf,
193                                       size_t count, loff_t *ppos)
194 {
195         struct request_queue *q = data;
196         int i;
197 
198         for (i = 0; i < BLK_MAX_WRITE_HINTS; i++)
199                 q->write_hints[i] = 0;
200 
201         return count;
202 }
203 
204 static const struct blk_mq_debugfs_attr blk_mq_debugfs_queue_attrs[] = {
205         { "poll_stat", 0400, queue_poll_stat_show },
206         { "requeue_list", 0400, .seq_ops = &queue_requeue_list_seq_ops },
207         { "pm_only", 0600, queue_pm_only_show, NULL },
208         { "state", 0600, queue_state_show, queue_state_write },
209         { "write_hints", 0600, queue_write_hint_show, queue_write_hint_store },
210         { "zone_wlock", 0400, queue_zone_wlock_show, NULL },
211         { },
212 };
213 
214 #define HCTX_STATE_NAME(name) [BLK_MQ_S_##name] = #name
215 static const char *const hctx_state_name[] = {
216         HCTX_STATE_NAME(STOPPED),
217         HCTX_STATE_NAME(TAG_ACTIVE),
218         HCTX_STATE_NAME(SCHED_RESTART),
219         HCTX_STATE_NAME(INACTIVE),
220 };
221 #undef HCTX_STATE_NAME
222 
223 static int hctx_state_show(void *data, struct seq_file *m)
224 {
225         struct blk_mq_hw_ctx *hctx = data;
226 
227         blk_flags_show(m, hctx->state, hctx_state_name,
228                        ARRAY_SIZE(hctx_state_name));
229         seq_puts(m, "\n");
230         return 0;
231 }
232 
233 #define BLK_TAG_ALLOC_NAME(name) [BLK_TAG_ALLOC_##name] = #name
234 static const char *const alloc_policy_name[] = {
235         BLK_TAG_ALLOC_NAME(FIFO),
236         BLK_TAG_ALLOC_NAME(RR),
237 };
238 #undef BLK_TAG_ALLOC_NAME
239 
240 #define HCTX_FLAG_NAME(name) [ilog2(BLK_MQ_F_##name)] = #name
241 static const char *const hctx_flag_name[] = {
242         HCTX_FLAG_NAME(SHOULD_MERGE),
243         HCTX_FLAG_NAME(TAG_SHARED),
244         HCTX_FLAG_NAME(BLOCKING),
245         HCTX_FLAG_NAME(NO_SCHED),
246         HCTX_FLAG_NAME(STACKING),
247 };
248 #undef HCTX_FLAG_NAME
249 
250 static int hctx_flags_show(void *data, struct seq_file *m)
251 {
252         struct blk_mq_hw_ctx *hctx = data;
253         const int alloc_policy = BLK_MQ_FLAG_TO_ALLOC_POLICY(hctx->flags);
254 
255         seq_puts(m, "alloc_policy=");
256         if (alloc_policy < ARRAY_SIZE(alloc_policy_name) &&
257             alloc_policy_name[alloc_policy])
258                 seq_puts(m, alloc_policy_name[alloc_policy]);
259         else
260                 seq_printf(m, "%d", alloc_policy);
261         seq_puts(m, " ");
262         blk_flags_show(m,
263                        hctx->flags ^ BLK_ALLOC_POLICY_TO_MQ_FLAG(alloc_policy),
264                        hctx_flag_name, ARRAY_SIZE(hctx_flag_name));
265         seq_puts(m, "\n");
266         return 0;
267 }
268 
269 #define CMD_FLAG_NAME(name) [__REQ_##name] = #name
270 static const char *const cmd_flag_name[] = {
271         CMD_FLAG_NAME(FAILFAST_DEV),
272         CMD_FLAG_NAME(FAILFAST_TRANSPORT),
273         CMD_FLAG_NAME(FAILFAST_DRIVER),
274         CMD_FLAG_NAME(SYNC),
275         CMD_FLAG_NAME(META),
276         CMD_FLAG_NAME(PRIO),
277         CMD_FLAG_NAME(NOMERGE),
278         CMD_FLAG_NAME(IDLE),
279         CMD_FLAG_NAME(INTEGRITY),
280         CMD_FLAG_NAME(FUA),
281         CMD_FLAG_NAME(PREFLUSH),
282         CMD_FLAG_NAME(RAHEAD),
283         CMD_FLAG_NAME(BACKGROUND),
284         CMD_FLAG_NAME(NOWAIT),
285         CMD_FLAG_NAME(NOUNMAP),
286         CMD_FLAG_NAME(HIPRI),
287 };
288 #undef CMD_FLAG_NAME
289 
290 #define RQF_NAME(name) [ilog2((__force u32)RQF_##name)] = #name
291 static const char *const rqf_name[] = {
292         RQF_NAME(SORTED),
293         RQF_NAME(STARTED),
294         RQF_NAME(SOFTBARRIER),
295         RQF_NAME(FLUSH_SEQ),
296         RQF_NAME(MIXED_MERGE),
297         RQF_NAME(MQ_INFLIGHT),
298         RQF_NAME(DONTPREP),
299         RQF_NAME(PREEMPT),
300         RQF_NAME(FAILED),
301         RQF_NAME(QUIET),
302         RQF_NAME(ELVPRIV),
303         RQF_NAME(IO_STAT),
304         RQF_NAME(ALLOCED),
305         RQF_NAME(PM),
306         RQF_NAME(HASHED),
307         RQF_NAME(STATS),
308         RQF_NAME(SPECIAL_PAYLOAD),
309         RQF_NAME(ZONE_WRITE_LOCKED),
310         RQF_NAME(MQ_POLL_SLEPT),
311 };
312 #undef RQF_NAME
313 
314 static const char *const blk_mq_rq_state_name_array[] = {
315         [MQ_RQ_IDLE]            = "idle",
316         [MQ_RQ_IN_FLIGHT]       = "in_flight",
317         [MQ_RQ_COMPLETE]        = "complete",
318 };
319 
320 static const char *blk_mq_rq_state_name(enum mq_rq_state rq_state)
321 {
322         if (WARN_ON_ONCE((unsigned int)rq_state >=
323                          ARRAY_SIZE(blk_mq_rq_state_name_array)))
324                 return "(?)";
325         return blk_mq_rq_state_name_array[rq_state];
326 }
327 
328 int __blk_mq_debugfs_rq_show(struct seq_file *m, struct request *rq)
329 {
330         const struct blk_mq_ops *const mq_ops = rq->q->mq_ops;
331         const unsigned int op = req_op(rq);
332         const char *op_str = blk_op_str(op);
333 
334         seq_printf(m, "%p {.op=", rq);
335         if (strcmp(op_str, "UNKNOWN") == 0)
336                 seq_printf(m, "%u", op);
337         else
338                 seq_printf(m, "%s", op_str);
339         seq_puts(m, ", .cmd_flags=");
340         blk_flags_show(m, rq->cmd_flags & ~REQ_OP_MASK, cmd_flag_name,
341                        ARRAY_SIZE(cmd_flag_name));
342         seq_puts(m, ", .rq_flags=");
343         blk_flags_show(m, (__force unsigned int)rq->rq_flags, rqf_name,
344                        ARRAY_SIZE(rqf_name));
345         seq_printf(m, ", .state=%s", blk_mq_rq_state_name(blk_mq_rq_state(rq)));
346         seq_printf(m, ", .tag=%d, .internal_tag=%d", rq->tag,
347                    rq->internal_tag);
348         if (mq_ops->show_rq)
349                 mq_ops->show_rq(m, rq);
350         seq_puts(m, "}\n");
351         return 0;
352 }
353 EXPORT_SYMBOL_GPL(__blk_mq_debugfs_rq_show);
354 
355 int blk_mq_debugfs_rq_show(struct seq_file *m, void *v)
356 {
357         return __blk_mq_debugfs_rq_show(m, list_entry_rq(v));
358 }
359 EXPORT_SYMBOL_GPL(blk_mq_debugfs_rq_show);
360 
361 static void *hctx_dispatch_start(struct seq_file *m, loff_t *pos)
362         __acquires(&hctx->lock)
363 {
364         struct blk_mq_hw_ctx *hctx = m->private;
365 
366         spin_lock(&hctx->lock);
367         return seq_list_start(&hctx->dispatch, *pos);
368 }
369 
370 static void *hctx_dispatch_next(struct seq_file *m, void *v, loff_t *pos)
371 {
372         struct blk_mq_hw_ctx *hctx = m->private;
373 
374         return seq_list_next(v, &hctx->dispatch, pos);
375 }
376 
377 static void hctx_dispatch_stop(struct seq_file *m, void *v)
378         __releases(&hctx->lock)
379 {
380         struct blk_mq_hw_ctx *hctx = m->private;
381 
382         spin_unlock(&hctx->lock);
383 }
384 
385 static const struct seq_operations hctx_dispatch_seq_ops = {
386         .start  = hctx_dispatch_start,
387         .next   = hctx_dispatch_next,
388         .stop   = hctx_dispatch_stop,
389         .show   = blk_mq_debugfs_rq_show,
390 };
391 
392 struct show_busy_params {
393         struct seq_file         *m;
394         struct blk_mq_hw_ctx    *hctx;
395 };
396 
397 /*
398  * Note: the state of a request may change while this function is in progress,
399  * e.g. due to a concurrent blk_mq_finish_request() call. Returns true to
400  * keep iterating requests.
401  */
402 static bool hctx_show_busy_rq(struct request *rq, void *data, bool reserved)
403 {
404         const struct show_busy_params *params = data;
405 
406         if (rq->mq_hctx == params->hctx)
407                 __blk_mq_debugfs_rq_show(params->m, rq);
408 
409         return true;
410 }
411 
412 static int hctx_busy_show(void *data, struct seq_file *m)
413 {
414         struct blk_mq_hw_ctx *hctx = data;
415         struct show_busy_params params = { .m = m, .hctx = hctx };
416 
417         blk_mq_tagset_busy_iter(hctx->queue->tag_set, hctx_show_busy_rq,
418                                 &params);
419 
420         return 0;
421 }
422 
423 static const char *const hctx_types[] = {
424         [HCTX_TYPE_DEFAULT]     = "default",
425         [HCTX_TYPE_READ]        = "read",
426         [HCTX_TYPE_POLL]        = "poll",
427 };
428 
429 static int hctx_type_show(void *data, struct seq_file *m)
430 {
431         struct blk_mq_hw_ctx *hctx = data;
432 
433         BUILD_BUG_ON(ARRAY_SIZE(hctx_types) != HCTX_MAX_TYPES);
434         seq_printf(m, "%s\n", hctx_types[hctx->type]);
435         return 0;
436 }
437 
438 static int hctx_ctx_map_show(void *data, struct seq_file *m)
439 {
440         struct blk_mq_hw_ctx *hctx = data;
441 
442         sbitmap_bitmap_show(&hctx->ctx_map, m);
443         return 0;
444 }
445 
446 static void blk_mq_debugfs_tags_show(struct seq_file *m,
447                                      struct blk_mq_tags *tags)
448 {
449         seq_printf(m, "nr_tags=%u\n", tags->nr_tags);
450         seq_printf(m, "nr_reserved_tags=%u\n", tags->nr_reserved_tags);
451         seq_printf(m, "active_queues=%d\n",
452                    atomic_read(&tags->active_queues));
453 
454         seq_puts(m, "\nbitmap_tags:\n");
455         sbitmap_queue_show(&tags->bitmap_tags, m);
456 
457         if (tags->nr_reserved_tags) {
458                 seq_puts(m, "\nbreserved_tags:\n");
459                 sbitmap_queue_show(&tags->breserved_tags, m);
460         }
461 }
462 
463 static int hctx_tags_show(void *data, struct seq_file *m)
464 {
465         struct blk_mq_hw_ctx *hctx = data;
466         struct request_queue *q = hctx->queue;
467         int res;
468 
469         res = mutex_lock_interruptible(&q->sysfs_lock);
470         if (res)
471                 goto out;
472         if (hctx->tags)
473                 blk_mq_debugfs_tags_show(m, hctx->tags);
474         mutex_unlock(&q->sysfs_lock);
475 
476 out:
477         return res;
478 }
479 
480 static int hctx_tags_bitmap_show(void *data, struct seq_file *m)
481 {
482         struct blk_mq_hw_ctx *hctx = data;
483         struct request_queue *q = hctx->queue;
484         int res;
485 
486         res = mutex_lock_interruptible(&q->sysfs_lock);
487         if (res)
488                 goto out;
489         if (hctx->tags)
490                 sbitmap_bitmap_show(&hctx->tags->bitmap_tags.sb, m);
491         mutex_unlock(&q->sysfs_lock);
492 
493 out:
494         return res;
495 }
496 
497 static int hctx_sched_tags_show(void *data, struct seq_file *m)
498 {
499         struct blk_mq_hw_ctx *hctx = data;
500         struct request_queue *q = hctx->queue;
501         int res;
502 
503         res = mutex_lock_interruptible(&q->sysfs_lock);
504         if (res)
505                 goto out;
506         if (hctx->sched_tags)
507                 blk_mq_debugfs_tags_show(m, hctx->sched_tags);
508         mutex_unlock(&q->sysfs_lock);
509 
510 out:
511         return res;
512 }
513 
514 static int hctx_sched_tags_bitmap_show(void *data, struct seq_file *m)
515 {
516         struct blk_mq_hw_ctx *hctx = data;
517         struct request_queue *q = hctx->queue;
518         int res;
519 
520         res = mutex_lock_interruptible(&q->sysfs_lock);
521         if (res)
522                 goto out;
523         if (hctx->sched_tags)
524                 sbitmap_bitmap_show(&hctx->sched_tags->bitmap_tags.sb, m);
525         mutex_unlock(&q->sysfs_lock);
526 
527 out:
528         return res;
529 }
530 
531 static int hctx_io_poll_show(void *data, struct seq_file *m)
532 {
533         struct blk_mq_hw_ctx *hctx = data;
534 
535         seq_printf(m, "considered=%lu\n", hctx->poll_considered);
536         seq_printf(m, "invoked=%lu\n", hctx->poll_invoked);
537         seq_printf(m, "success=%lu\n", hctx->poll_success);
538         return 0;
539 }
540 
541 static ssize_t hctx_io_poll_write(void *data, const char __user *buf,
542                                   size_t count, loff_t *ppos)
543 {
544         struct blk_mq_hw_ctx *hctx = data;
545 
546         hctx->poll_considered = hctx->poll_invoked = hctx->poll_success = 0;
547         return count;
548 }
549 
550 static int hctx_dispatched_show(void *data, struct seq_file *m)
551 {
552         struct blk_mq_hw_ctx *hctx = data;
553         int i;
554 
555         seq_printf(m, "%8u\t%lu\n", 0U, hctx->dispatched[0]);
556 
557         for (i = 1; i < BLK_MQ_MAX_DISPATCH_ORDER - 1; i++) {
558                 unsigned int d = 1U << (i - 1);
559 
560                 seq_printf(m, "%8u\t%lu\n", d, hctx->dispatched[i]);
561         }
562 
563         seq_printf(m, "%8u+\t%lu\n", 1U << (i - 1), hctx->dispatched[i]);
564         return 0;
565 }
566 
567 static ssize_t hctx_dispatched_write(void *data, const char __user *buf,
568                                      size_t count, loff_t *ppos)
569 {
570         struct blk_mq_hw_ctx *hctx = data;
571         int i;
572 
573         for (i = 0; i < BLK_MQ_MAX_DISPATCH_ORDER; i++)
574                 hctx->dispatched[i] = 0;
575         return count;
576 }
577 
578 static int hctx_queued_show(void *data, struct seq_file *m)
579 {
580         struct blk_mq_hw_ctx *hctx = data;
581 
582         seq_printf(m, "%lu\n", hctx->queued);
583         return 0;
584 }
585 
586 static ssize_t hctx_queued_write(void *data, const char __user *buf,
587                                  size_t count, loff_t *ppos)
588 {
589         struct blk_mq_hw_ctx *hctx = data;
590 
591         hctx->queued = 0;
592         return count;
593 }
594 
595 static int hctx_run_show(void *data, struct seq_file *m)
596 {
597         struct blk_mq_hw_ctx *hctx = data;
598 
599         seq_printf(m, "%lu\n", hctx->run);
600         return 0;
601 }
602 
603 static ssize_t hctx_run_write(void *data, const char __user *buf, size_t count,
604                               loff_t *ppos)
605 {
606         struct blk_mq_hw_ctx *hctx = data;
607 
608         hctx->run = 0;
609         return count;
610 }
611 
612 static int hctx_active_show(void *data, struct seq_file *m)
613 {
614         struct blk_mq_hw_ctx *hctx = data;
615 
616         seq_printf(m, "%d\n", atomic_read(&hctx->nr_active));
617         return 0;
618 }
619 
620 static int hctx_dispatch_busy_show(void *data, struct seq_file *m)
621 {
622         struct blk_mq_hw_ctx *hctx = data;
623 
624         seq_printf(m, "%u\n", hctx->dispatch_busy);
625         return 0;
626 }
627 
628 #define CTX_RQ_SEQ_OPS(name, type)                                      \
629 static void *ctx_##name##_rq_list_start(struct seq_file *m, loff_t *pos) \
630         __acquires(&ctx->lock)                                          \
631 {                                                                       \
632         struct blk_mq_ctx *ctx = m->private;                            \
633                                                                         \
634         spin_lock(&ctx->lock);                                          \
635         return seq_list_start(&ctx->rq_lists[type], *pos);              \
636 }                                                                       \
637                                                                         \
638 static void *ctx_##name##_rq_list_next(struct seq_file *m, void *v,     \
639                                      loff_t *pos)                       \
640 {                                                                       \
641         struct blk_mq_ctx *ctx = m->private;                            \
642                                                                         \
643         return seq_list_next(v, &ctx->rq_lists[type], pos);             \
644 }                                                                       \
645                                                                         \
646 static void ctx_##name##_rq_list_stop(struct seq_file *m, void *v)      \
647         __releases(&ctx->lock)                                          \
648 {                                                                       \
649         struct blk_mq_ctx *ctx = m->private;                            \
650                                                                         \
651         spin_unlock(&ctx->lock);                                        \
652 }                                                                       \
653                                                                         \
654 static const struct seq_operations ctx_##name##_rq_list_seq_ops = {     \
655         .start  = ctx_##name##_rq_list_start,                           \
656         .next   = ctx_##name##_rq_list_next,                            \
657         .stop   = ctx_##name##_rq_list_stop,                            \
658         .show   = blk_mq_debugfs_rq_show,                               \
659 }
660 
661 CTX_RQ_SEQ_OPS(default, HCTX_TYPE_DEFAULT);
662 CTX_RQ_SEQ_OPS(read, HCTX_TYPE_READ);
663 CTX_RQ_SEQ_OPS(poll, HCTX_TYPE_POLL);
664 
665 static int ctx_dispatched_show(void *data, struct seq_file *m)
666 {
667         struct blk_mq_ctx *ctx = data;
668 
669         seq_printf(m, "%lu %lu\n", ctx->rq_dispatched[1], ctx->rq_dispatched[0]);
670         return 0;
671 }
672 
673 static ssize_t ctx_dispatched_write(void *data, const char __user *buf,
674                                     size_t count, loff_t *ppos)
675 {
676         struct blk_mq_ctx *ctx = data;
677 
678         ctx->rq_dispatched[0] = ctx->rq_dispatched[1] = 0;
679         return count;
680 }
681 
682 static int ctx_merged_show(void *data, struct seq_file *m)
683 {
684         struct blk_mq_ctx *ctx = data;
685 
686         seq_printf(m, "%lu\n", ctx->rq_merged);
687         return 0;
688 }
689 
690 static ssize_t ctx_merged_write(void *data, const char __user *buf,
691                                 size_t count, loff_t *ppos)
692 {
693         struct blk_mq_ctx *ctx = data;
694 
695         ctx->rq_merged = 0;
696         return count;
697 }
698 
699 static int ctx_completed_show(void *data, struct seq_file *m)
700 {
701         struct blk_mq_ctx *ctx = data;
702 
703         seq_printf(m, "%lu %lu\n", ctx->rq_completed[1], ctx->rq_completed[0]);
704         return 0;
705 }
706 
707 static ssize_t ctx_completed_write(void *data, const char __user *buf,
708                                    size_t count, loff_t *ppos)
709 {
710         struct blk_mq_ctx *ctx = data;
711 
712         ctx->rq_completed[0] = ctx->rq_completed[1] = 0;
713         return count;
714 }
715 
716 static int blk_mq_debugfs_show(struct seq_file *m, void *v)
717 {
718         const struct blk_mq_debugfs_attr *attr = m->private;
719         void *data = d_inode(m->file->f_path.dentry->d_parent)->i_private;
720 
721         return attr->show(data, m);
722 }
723 
724 static ssize_t blk_mq_debugfs_write(struct file *file, const char __user *buf,
725                                     size_t count, loff_t *ppos)
726 {
727         struct seq_file *m = file->private_data;
728         const struct blk_mq_debugfs_attr *attr = m->private;
729         void *data = d_inode(file->f_path.dentry->d_parent)->i_private;
730 
731         /*
732          * Attributes that only implement .seq_ops are read-only and 'attr' is
733          * the same with 'data' in this case.
734          */
735         if (attr == data || !attr->write)
736                 return -EPERM;
737 
738         return attr->write(data, buf, count, ppos);
739 }
740 
741 static int blk_mq_debugfs_open(struct inode *inode, struct file *file)
742 {
743         const struct blk_mq_debugfs_attr *attr = inode->i_private;
744         void *data = d_inode(file->f_path.dentry->d_parent)->i_private;
745         struct seq_file *m;
746         int ret;
747 
748         if (attr->seq_ops) {
749                 ret = seq_open(file, attr->seq_ops);
750                 if (!ret) {
751                         m = file->private_data;
752                         m->private = data;
753                 }
754                 return ret;
755         }
756 
757         if (WARN_ON_ONCE(!attr->show))
758                 return -EPERM;
759 
760         return single_open(file, blk_mq_debugfs_show, inode->i_private);
761 }
762 
763 static int blk_mq_debugfs_release(struct inode *inode, struct file *file)
764 {
765         const struct blk_mq_debugfs_attr *attr = inode->i_private;
766 
767         if (attr->show)
768                 return single_release(inode, file);
769 
770         return seq_release(inode, file);
771 }
772 
773 static const struct file_operations blk_mq_debugfs_fops = {
774         .open           = blk_mq_debugfs_open,
775         .read           = seq_read,
776         .write          = blk_mq_debugfs_write,
777         .llseek         = seq_lseek,
778         .release        = blk_mq_debugfs_release,
779 };
780 
781 static const struct blk_mq_debugfs_attr blk_mq_debugfs_hctx_attrs[] = {
782         {"state", 0400, hctx_state_show},
783         {"flags", 0400, hctx_flags_show},
784         {"dispatch", 0400, .seq_ops = &hctx_dispatch_seq_ops},
785         {"busy", 0400, hctx_busy_show},
786         {"ctx_map", 0400, hctx_ctx_map_show},
787         {"tags", 0400, hctx_tags_show},
788         {"tags_bitmap", 0400, hctx_tags_bitmap_show},
789         {"sched_tags", 0400, hctx_sched_tags_show},
790         {"sched_tags_bitmap", 0400, hctx_sched_tags_bitmap_show},
791         {"io_poll", 0600, hctx_io_poll_show, hctx_io_poll_write},
792         {"dispatched", 0600, hctx_dispatched_show, hctx_dispatched_write},
793         {"queued", 0600, hctx_queued_show, hctx_queued_write},
794         {"run", 0600, hctx_run_show, hctx_run_write},
795         {"active", 0400, hctx_active_show},
796         {"dispatch_busy", 0400, hctx_dispatch_busy_show},
797         {"type", 0400, hctx_type_show},
798         {},
799 };
800 
801 static const struct blk_mq_debugfs_attr blk_mq_debugfs_ctx_attrs[] = {
802         {"default_rq_list", 0400, .seq_ops = &ctx_default_rq_list_seq_ops},
803         {"read_rq_list", 0400, .seq_ops = &ctx_read_rq_list_seq_ops},
804         {"poll_rq_list", 0400, .seq_ops = &ctx_poll_rq_list_seq_ops},
805         {"dispatched", 0600, ctx_dispatched_show, ctx_dispatched_write},
806         {"merged", 0600, ctx_merged_show, ctx_merged_write},
807         {"completed", 0600, ctx_completed_show, ctx_completed_write},
808         {},
809 };
810 
811 static void debugfs_create_files(struct dentry *parent, void *data,
812                                  const struct blk_mq_debugfs_attr *attr)
813 {
814         if (IS_ERR_OR_NULL(parent))
815                 return;
816 
817         d_inode(parent)->i_private = data;
818 
819         for (; attr->name; attr++)
820                 debugfs_create_file(attr->name, attr->mode, parent,
821                                     (void *)attr, &blk_mq_debugfs_fops);
822 }
823 
824 void blk_mq_debugfs_register(struct request_queue *q)
825 {
826         struct blk_mq_hw_ctx *hctx;
827         int i;
828 
829         debugfs_create_files(q->debugfs_dir, q, blk_mq_debugfs_queue_attrs);
830 
831         /*
832          * blk_mq_init_sched() attempted to do this already, but q->debugfs_dir
833          * didn't exist yet (because we don't know what to name the directory
834          * until the queue is registered to a gendisk).
835          */
836         if (q->elevator && !q->sched_debugfs_dir)
837                 blk_mq_debugfs_register_sched(q);
838 
839         /* Similarly, blk_mq_init_hctx() couldn't do this previously. */
840         queue_for_each_hw_ctx(q, hctx, i) {
841                 if (!hctx->debugfs_dir)
842                         blk_mq_debugfs_register_hctx(q, hctx);
843                 if (q->elevator && !hctx->sched_debugfs_dir)
844                         blk_mq_debugfs_register_sched_hctx(q, hctx);
845         }
846 
847         if (q->rq_qos) {
848                 struct rq_qos *rqos = q->rq_qos;
849 
850                 while (rqos) {
851                         blk_mq_debugfs_register_rqos(rqos);
852                         rqos = rqos->next;
853                 }
854         }
855 }
856 
857 void blk_mq_debugfs_unregister(struct request_queue *q)
858 {
859         q->sched_debugfs_dir = NULL;
860 }
861 
862 static void blk_mq_debugfs_register_ctx(struct blk_mq_hw_ctx *hctx,
863                                         struct blk_mq_ctx *ctx)
864 {
865         struct dentry *ctx_dir;
866         char name[20];
867 
868         snprintf(name, sizeof(name), "cpu%u", ctx->cpu);
869         ctx_dir = debugfs_create_dir(name, hctx->debugfs_dir);
870 
871         debugfs_create_files(ctx_dir, ctx, blk_mq_debugfs_ctx_attrs);
872 }
873 
874 void blk_mq_debugfs_register_hctx(struct request_queue *q,
875                                   struct blk_mq_hw_ctx *hctx)
876 {
877         struct blk_mq_ctx *ctx;
878         char name[20];
879         int i;
880 
881         snprintf(name, sizeof(name), "hctx%u", hctx->queue_num);
882         hctx->debugfs_dir = debugfs_create_dir(name, q->debugfs_dir);
883 
884         debugfs_create_files(hctx->debugfs_dir, hctx, blk_mq_debugfs_hctx_attrs);
885 
886         hctx_for_each_ctx(hctx, ctx, i)
887                 blk_mq_debugfs_register_ctx(hctx, ctx);
888 }
889 
890 void blk_mq_debugfs_unregister_hctx(struct blk_mq_hw_ctx *hctx)
891 {
892         debugfs_remove_recursive(hctx->debugfs_dir);
893         hctx->sched_debugfs_dir = NULL;
894         hctx->debugfs_dir = NULL;
895 }
896 
897 void blk_mq_debugfs_register_hctxs(struct request_queue *q)
898 {
899         struct blk_mq_hw_ctx *hctx;
900         int i;
901 
902         queue_for_each_hw_ctx(q, hctx, i)
903                 blk_mq_debugfs_register_hctx(q, hctx);
904 }
905 
906 void blk_mq_debugfs_unregister_hctxs(struct request_queue *q)
907 {
908         struct blk_mq_hw_ctx *hctx;
909         int i;
910 
911         queue_for_each_hw_ctx(q, hctx, i)
912                 blk_mq_debugfs_unregister_hctx(hctx);
913 }
914 
915 void blk_mq_debugfs_register_sched(struct request_queue *q)
916 {
917         struct elevator_type *e = q->elevator->type;
918 
919         /*
920          * If the parent directory has not been created yet, return, we will be
921          * called again later on and the directory/files will be created then.
922          */
923         if (!q->debugfs_dir)
924                 return;
925 
926         if (!e->queue_debugfs_attrs)
927                 return;
928 
929         q->sched_debugfs_dir = debugfs_create_dir("sched", q->debugfs_dir);
930 
931         debugfs_create_files(q->sched_debugfs_dir, q, e->queue_debugfs_attrs);
932 }
933 
934 void blk_mq_debugfs_unregister_sched(struct request_queue *q)
935 {
936         debugfs_remove_recursive(q->sched_debugfs_dir);
937         q->sched_debugfs_dir = NULL;
938 }
939 
940 void blk_mq_debugfs_unregister_rqos(struct rq_qos *rqos)
941 {
942         debugfs_remove_recursive(rqos->debugfs_dir);
943         rqos->debugfs_dir = NULL;
944 }
945 
946 void blk_mq_debugfs_register_rqos(struct rq_qos *rqos)
947 {
948         struct request_queue *q = rqos->q;
949         const char *dir_name = rq_qos_id_to_name(rqos->id);
950 
951         if (rqos->debugfs_dir || !rqos->ops->debugfs_attrs)
952                 return;
953 
954         if (!q->rqos_debugfs_dir)
955                 q->rqos_debugfs_dir = debugfs_create_dir("rqos",
956                                                          q->debugfs_dir);
957 
958         rqos->debugfs_dir = debugfs_create_dir(dir_name,
959                                                rqos->q->rqos_debugfs_dir);
960 
961         debugfs_create_files(rqos->debugfs_dir, rqos, rqos->ops->debugfs_attrs);
962 }
963 
964 void blk_mq_debugfs_unregister_queue_rqos(struct request_queue *q)
965 {
966         debugfs_remove_recursive(q->rqos_debugfs_dir);
967         q->rqos_debugfs_dir = NULL;
968 }
969 
970 void blk_mq_debugfs_register_sched_hctx(struct request_queue *q,
971                                         struct blk_mq_hw_ctx *hctx)
972 {
973         struct elevator_type *e = q->elevator->type;
974 
975         if (!e->hctx_debugfs_attrs)
976                 return;
977 
978         hctx->sched_debugfs_dir = debugfs_create_dir("sched",
979                                                      hctx->debugfs_dir);
980         debugfs_create_files(hctx->sched_debugfs_dir, hctx,
981                              e->hctx_debugfs_attrs);
982 }
983 
984 void blk_mq_debugfs_unregister_sched_hctx(struct blk_mq_hw_ctx *hctx)
985 {
986         debugfs_remove_recursive(hctx->sched_debugfs_dir);
987         hctx->sched_debugfs_dir = NULL;
988 }
989 

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