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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(STABLE_WRITES),
120         QUEUE_FLAG_NAME(POLL),
121         QUEUE_FLAG_NAME(WC),
122         QUEUE_FLAG_NAME(FUA),
123         QUEUE_FLAG_NAME(DAX),
124         QUEUE_FLAG_NAME(STATS),
125         QUEUE_FLAG_NAME(POLL_STATS),
126         QUEUE_FLAG_NAME(REGISTERED),
127         QUEUE_FLAG_NAME(QUIESCED),
128         QUEUE_FLAG_NAME(PCI_P2PDMA),
129         QUEUE_FLAG_NAME(ZONE_RESETALL),
130         QUEUE_FLAG_NAME(RQ_ALLOC_TIME),
131         QUEUE_FLAG_NAME(HCTX_ACTIVE),
132         QUEUE_FLAG_NAME(NOWAIT),
133 };
134 #undef QUEUE_FLAG_NAME
135 
136 static int queue_state_show(void *data, struct seq_file *m)
137 {
138         struct request_queue *q = data;
139 
140         blk_flags_show(m, q->queue_flags, blk_queue_flag_name,
141                        ARRAY_SIZE(blk_queue_flag_name));
142         seq_puts(m, "\n");
143         return 0;
144 }
145 
146 static ssize_t queue_state_write(void *data, const char __user *buf,
147                                  size_t count, loff_t *ppos)
148 {
149         struct request_queue *q = data;
150         char opbuf[16] = { }, *op;
151 
152         /*
153          * The "state" attribute is removed after blk_cleanup_queue() has called
154          * blk_mq_free_queue(). Return if QUEUE_FLAG_DEAD has been set to avoid
155          * triggering a use-after-free.
156          */
157         if (blk_queue_dead(q))
158                 return -ENOENT;
159 
160         if (count >= sizeof(opbuf)) {
161                 pr_err("%s: operation too long\n", __func__);
162                 goto inval;
163         }
164 
165         if (copy_from_user(opbuf, buf, count))
166                 return -EFAULT;
167         op = strstrip(opbuf);
168         if (strcmp(op, "run") == 0) {
169                 blk_mq_run_hw_queues(q, true);
170         } else if (strcmp(op, "start") == 0) {
171                 blk_mq_start_stopped_hw_queues(q, true);
172         } else if (strcmp(op, "kick") == 0) {
173                 blk_mq_kick_requeue_list(q);
174         } else {
175                 pr_err("%s: unsupported operation '%s'\n", __func__, op);
176 inval:
177                 pr_err("%s: use 'run', 'start' or 'kick'\n", __func__);
178                 return -EINVAL;
179         }
180         return count;
181 }
182 
183 static int queue_write_hint_show(void *data, struct seq_file *m)
184 {
185         struct request_queue *q = data;
186         int i;
187 
188         for (i = 0; i < BLK_MAX_WRITE_HINTS; i++)
189                 seq_printf(m, "hint%d: %llu\n", i, q->write_hints[i]);
190 
191         return 0;
192 }
193 
194 static ssize_t queue_write_hint_store(void *data, const char __user *buf,
195                                       size_t count, loff_t *ppos)
196 {
197         struct request_queue *q = data;
198         int i;
199 
200         for (i = 0; i < BLK_MAX_WRITE_HINTS; i++)
201                 q->write_hints[i] = 0;
202 
203         return count;
204 }
205 
206 static const struct blk_mq_debugfs_attr blk_mq_debugfs_queue_attrs[] = {
207         { "poll_stat", 0400, queue_poll_stat_show },
208         { "requeue_list", 0400, .seq_ops = &queue_requeue_list_seq_ops },
209         { "pm_only", 0600, queue_pm_only_show, NULL },
210         { "state", 0600, queue_state_show, queue_state_write },
211         { "write_hints", 0600, queue_write_hint_show, queue_write_hint_store },
212         { "zone_wlock", 0400, queue_zone_wlock_show, NULL },
213         { },
214 };
215 
216 #define HCTX_STATE_NAME(name) [BLK_MQ_S_##name] = #name
217 static const char *const hctx_state_name[] = {
218         HCTX_STATE_NAME(STOPPED),
219         HCTX_STATE_NAME(TAG_ACTIVE),
220         HCTX_STATE_NAME(SCHED_RESTART),
221         HCTX_STATE_NAME(INACTIVE),
222 };
223 #undef HCTX_STATE_NAME
224 
225 static int hctx_state_show(void *data, struct seq_file *m)
226 {
227         struct blk_mq_hw_ctx *hctx = data;
228 
229         blk_flags_show(m, hctx->state, hctx_state_name,
230                        ARRAY_SIZE(hctx_state_name));
231         seq_puts(m, "\n");
232         return 0;
233 }
234 
235 #define BLK_TAG_ALLOC_NAME(name) [BLK_TAG_ALLOC_##name] = #name
236 static const char *const alloc_policy_name[] = {
237         BLK_TAG_ALLOC_NAME(FIFO),
238         BLK_TAG_ALLOC_NAME(RR),
239 };
240 #undef BLK_TAG_ALLOC_NAME
241 
242 #define HCTX_FLAG_NAME(name) [ilog2(BLK_MQ_F_##name)] = #name
243 static const char *const hctx_flag_name[] = {
244         HCTX_FLAG_NAME(SHOULD_MERGE),
245         HCTX_FLAG_NAME(TAG_QUEUE_SHARED),
246         HCTX_FLAG_NAME(BLOCKING),
247         HCTX_FLAG_NAME(NO_SCHED),
248         HCTX_FLAG_NAME(STACKING),
249         HCTX_FLAG_NAME(TAG_HCTX_SHARED),
250 };
251 #undef HCTX_FLAG_NAME
252 
253 static 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 CMD_FLAG_NAME(name) [__REQ_##name] = #name
273 static const char *const cmd_flag_name[] = {
274         CMD_FLAG_NAME(FAILFAST_DEV),
275         CMD_FLAG_NAME(FAILFAST_TRANSPORT),
276         CMD_FLAG_NAME(FAILFAST_DRIVER),
277         CMD_FLAG_NAME(SYNC),
278         CMD_FLAG_NAME(META),
279         CMD_FLAG_NAME(PRIO),
280         CMD_FLAG_NAME(NOMERGE),
281         CMD_FLAG_NAME(IDLE),
282         CMD_FLAG_NAME(INTEGRITY),
283         CMD_FLAG_NAME(FUA),
284         CMD_FLAG_NAME(PREFLUSH),
285         CMD_FLAG_NAME(RAHEAD),
286         CMD_FLAG_NAME(BACKGROUND),
287         CMD_FLAG_NAME(NOWAIT),
288         CMD_FLAG_NAME(NOUNMAP),
289         CMD_FLAG_NAME(POLLED),
290 };
291 #undef CMD_FLAG_NAME
292 
293 #define RQF_NAME(name) [ilog2((__force u32)RQF_##name)] = #name
294 static const char *const rqf_name[] = {
295         RQF_NAME(STARTED),
296         RQF_NAME(SOFTBARRIER),
297         RQF_NAME(FLUSH_SEQ),
298         RQF_NAME(MIXED_MERGE),
299         RQF_NAME(MQ_INFLIGHT),
300         RQF_NAME(DONTPREP),
301         RQF_NAME(FAILED),
302         RQF_NAME(QUIET),
303         RQF_NAME(ELVPRIV),
304         RQF_NAME(IO_STAT),
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         RQF_NAME(ELV),
312 };
313 #undef RQF_NAME
314 
315 static const char *const blk_mq_rq_state_name_array[] = {
316         [MQ_RQ_IDLE]            = "idle",
317         [MQ_RQ_IN_FLIGHT]       = "in_flight",
318         [MQ_RQ_COMPLETE]        = "complete",
319 };
320 
321 static const char *blk_mq_rq_state_name(enum mq_rq_state rq_state)
322 {
323         if (WARN_ON_ONCE((unsigned int)rq_state >=
324                          ARRAY_SIZE(blk_mq_rq_state_name_array)))
325                 return "(?)";
326         return blk_mq_rq_state_name_array[rq_state];
327 }
328 
329 int __blk_mq_debugfs_rq_show(struct seq_file *m, struct request *rq)
330 {
331         const struct blk_mq_ops *const mq_ops = rq->q->mq_ops;
332         const unsigned int op = req_op(rq);
333         const char *op_str = blk_op_str(op);
334 
335         seq_printf(m, "%p {.op=", rq);
336         if (strcmp(op_str, "UNKNOWN") == 0)
337                 seq_printf(m, "%u", op);
338         else
339                 seq_printf(m, "%s", op_str);
340         seq_puts(m, ", .cmd_flags=");
341         blk_flags_show(m, rq->cmd_flags & ~REQ_OP_MASK, cmd_flag_name,
342                        ARRAY_SIZE(cmd_flag_name));
343         seq_puts(m, ", .rq_flags=");
344         blk_flags_show(m, (__force unsigned int)rq->rq_flags, rqf_name,
345                        ARRAY_SIZE(rqf_name));
346         seq_printf(m, ", .state=%s", blk_mq_rq_state_name(blk_mq_rq_state(rq)));
347         seq_printf(m, ", .tag=%d, .internal_tag=%d", rq->tag,
348                    rq->internal_tag);
349         if (mq_ops->show_rq)
350                 mq_ops->show_rq(m, rq);
351         seq_puts(m, "}\n");
352         return 0;
353 }
354 EXPORT_SYMBOL_GPL(__blk_mq_debugfs_rq_show);
355 
356 int blk_mq_debugfs_rq_show(struct seq_file *m, void *v)
357 {
358         return __blk_mq_debugfs_rq_show(m, list_entry_rq(v));
359 }
360 EXPORT_SYMBOL_GPL(blk_mq_debugfs_rq_show);
361 
362 static void *hctx_dispatch_start(struct seq_file *m, loff_t *pos)
363         __acquires(&hctx->lock)
364 {
365         struct blk_mq_hw_ctx *hctx = m->private;
366 
367         spin_lock(&hctx->lock);
368         return seq_list_start(&hctx->dispatch, *pos);
369 }
370 
371 static void *hctx_dispatch_next(struct seq_file *m, void *v, loff_t *pos)
372 {
373         struct blk_mq_hw_ctx *hctx = m->private;
374 
375         return seq_list_next(v, &hctx->dispatch, pos);
376 }
377 
378 static void hctx_dispatch_stop(struct seq_file *m, void *v)
379         __releases(&hctx->lock)
380 {
381         struct blk_mq_hw_ctx *hctx = m->private;
382 
383         spin_unlock(&hctx->lock);
384 }
385 
386 static const struct seq_operations hctx_dispatch_seq_ops = {
387         .start  = hctx_dispatch_start,
388         .next   = hctx_dispatch_next,
389         .stop   = hctx_dispatch_stop,
390         .show   = blk_mq_debugfs_rq_show,
391 };
392 
393 struct show_busy_params {
394         struct seq_file         *m;
395         struct blk_mq_hw_ctx    *hctx;
396 };
397 
398 /*
399  * Note: the state of a request may change while this function is in progress,
400  * e.g. due to a concurrent blk_mq_finish_request() call. Returns true to
401  * keep iterating requests.
402  */
403 static bool hctx_show_busy_rq(struct request *rq, void *data, bool reserved)
404 {
405         const struct show_busy_params *params = data;
406 
407         if (rq->mq_hctx == params->hctx)
408                 __blk_mq_debugfs_rq_show(params->m, rq);
409 
410         return true;
411 }
412 
413 static int hctx_busy_show(void *data, struct seq_file *m)
414 {
415         struct blk_mq_hw_ctx *hctx = data;
416         struct show_busy_params params = { .m = m, .hctx = hctx };
417 
418         blk_mq_tagset_busy_iter(hctx->queue->tag_set, hctx_show_busy_rq,
419                                 &params);
420 
421         return 0;
422 }
423 
424 static const char *const hctx_types[] = {
425         [HCTX_TYPE_DEFAULT]     = "default",
426         [HCTX_TYPE_READ]        = "read",
427         [HCTX_TYPE_POLL]        = "poll",
428 };
429 
430 static int hctx_type_show(void *data, struct seq_file *m)
431 {
432         struct blk_mq_hw_ctx *hctx = data;
433 
434         BUILD_BUG_ON(ARRAY_SIZE(hctx_types) != HCTX_MAX_TYPES);
435         seq_printf(m, "%s\n", hctx_types[hctx->type]);
436         return 0;
437 }
438 
439 static int hctx_ctx_map_show(void *data, struct seq_file *m)
440 {
441         struct blk_mq_hw_ctx *hctx = data;
442 
443         sbitmap_bitmap_show(&hctx->ctx_map, m);
444         return 0;
445 }
446 
447 static void blk_mq_debugfs_tags_show(struct seq_file *m,
448                                      struct blk_mq_tags *tags)
449 {
450         seq_printf(m, "nr_tags=%u\n", tags->nr_tags);
451         seq_printf(m, "nr_reserved_tags=%u\n", tags->nr_reserved_tags);
452         seq_printf(m, "active_queues=%d\n",
453                    atomic_read(&tags->active_queues));
454 
455         seq_puts(m, "\nbitmap_tags:\n");
456         sbitmap_queue_show(&tags->bitmap_tags, m);
457 
458         if (tags->nr_reserved_tags) {
459                 seq_puts(m, "\nbreserved_tags:\n");
460                 sbitmap_queue_show(&tags->breserved_tags, m);
461         }
462 }
463 
464 static int hctx_tags_show(void *data, struct seq_file *m)
465 {
466         struct blk_mq_hw_ctx *hctx = data;
467         struct request_queue *q = hctx->queue;
468         int res;
469 
470         res = mutex_lock_interruptible(&q->sysfs_lock);
471         if (res)
472                 goto out;
473         if (hctx->tags)
474                 blk_mq_debugfs_tags_show(m, hctx->tags);
475         mutex_unlock(&q->sysfs_lock);
476 
477 out:
478         return res;
479 }
480 
481 static int hctx_tags_bitmap_show(void *data, struct seq_file *m)
482 {
483         struct blk_mq_hw_ctx *hctx = data;
484         struct request_queue *q = hctx->queue;
485         int res;
486 
487         res = mutex_lock_interruptible(&q->sysfs_lock);
488         if (res)
489                 goto out;
490         if (hctx->tags)
491                 sbitmap_bitmap_show(&hctx->tags->bitmap_tags.sb, m);
492         mutex_unlock(&q->sysfs_lock);
493 
494 out:
495         return res;
496 }
497 
498 static int hctx_sched_tags_show(void *data, struct seq_file *m)
499 {
500         struct blk_mq_hw_ctx *hctx = data;
501         struct request_queue *q = hctx->queue;
502         int res;
503 
504         res = mutex_lock_interruptible(&q->sysfs_lock);
505         if (res)
506                 goto out;
507         if (hctx->sched_tags)
508                 blk_mq_debugfs_tags_show(m, hctx->sched_tags);
509         mutex_unlock(&q->sysfs_lock);
510 
511 out:
512         return res;
513 }
514 
515 static int hctx_sched_tags_bitmap_show(void *data, struct seq_file *m)
516 {
517         struct blk_mq_hw_ctx *hctx = data;
518         struct request_queue *q = hctx->queue;
519         int res;
520 
521         res = mutex_lock_interruptible(&q->sysfs_lock);
522         if (res)
523                 goto out;
524         if (hctx->sched_tags)
525                 sbitmap_bitmap_show(&hctx->sched_tags->bitmap_tags.sb, m);
526         mutex_unlock(&q->sysfs_lock);
527 
528 out:
529         return res;
530 }
531 
532 static int hctx_run_show(void *data, struct seq_file *m)
533 {
534         struct blk_mq_hw_ctx *hctx = data;
535 
536         seq_printf(m, "%lu\n", hctx->run);
537         return 0;
538 }
539 
540 static ssize_t hctx_run_write(void *data, const char __user *buf, size_t count,
541                               loff_t *ppos)
542 {
543         struct blk_mq_hw_ctx *hctx = data;
544 
545         hctx->run = 0;
546         return count;
547 }
548 
549 static int hctx_active_show(void *data, struct seq_file *m)
550 {
551         struct blk_mq_hw_ctx *hctx = data;
552 
553         seq_printf(m, "%d\n", __blk_mq_active_requests(hctx));
554         return 0;
555 }
556 
557 static int hctx_dispatch_busy_show(void *data, struct seq_file *m)
558 {
559         struct blk_mq_hw_ctx *hctx = data;
560 
561         seq_printf(m, "%u\n", hctx->dispatch_busy);
562         return 0;
563 }
564 
565 #define CTX_RQ_SEQ_OPS(name, type)                                      \
566 static void *ctx_##name##_rq_list_start(struct seq_file *m, loff_t *pos) \
567         __acquires(&ctx->lock)                                          \
568 {                                                                       \
569         struct blk_mq_ctx *ctx = m->private;                            \
570                                                                         \
571         spin_lock(&ctx->lock);                                          \
572         return seq_list_start(&ctx->rq_lists[type], *pos);              \
573 }                                                                       \
574                                                                         \
575 static void *ctx_##name##_rq_list_next(struct seq_file *m, void *v,     \
576                                      loff_t *pos)                       \
577 {                                                                       \
578         struct blk_mq_ctx *ctx = m->private;                            \
579                                                                         \
580         return seq_list_next(v, &ctx->rq_lists[type], pos);             \
581 }                                                                       \
582                                                                         \
583 static void ctx_##name##_rq_list_stop(struct seq_file *m, void *v)      \
584         __releases(&ctx->lock)                                          \
585 {                                                                       \
586         struct blk_mq_ctx *ctx = m->private;                            \
587                                                                         \
588         spin_unlock(&ctx->lock);                                        \
589 }                                                                       \
590                                                                         \
591 static const struct seq_operations ctx_##name##_rq_list_seq_ops = {     \
592         .start  = ctx_##name##_rq_list_start,                           \
593         .next   = ctx_##name##_rq_list_next,                            \
594         .stop   = ctx_##name##_rq_list_stop,                            \
595         .show   = blk_mq_debugfs_rq_show,                               \
596 }
597 
598 CTX_RQ_SEQ_OPS(default, HCTX_TYPE_DEFAULT);
599 CTX_RQ_SEQ_OPS(read, HCTX_TYPE_READ);
600 CTX_RQ_SEQ_OPS(poll, HCTX_TYPE_POLL);
601 
602 static int blk_mq_debugfs_show(struct seq_file *m, void *v)
603 {
604         const struct blk_mq_debugfs_attr *attr = m->private;
605         void *data = d_inode(m->file->f_path.dentry->d_parent)->i_private;
606 
607         return attr->show(data, m);
608 }
609 
610 static ssize_t blk_mq_debugfs_write(struct file *file, const char __user *buf,
611                                     size_t count, loff_t *ppos)
612 {
613         struct seq_file *m = file->private_data;
614         const struct blk_mq_debugfs_attr *attr = m->private;
615         void *data = d_inode(file->f_path.dentry->d_parent)->i_private;
616 
617         /*
618          * Attributes that only implement .seq_ops are read-only and 'attr' is
619          * the same with 'data' in this case.
620          */
621         if (attr == data || !attr->write)
622                 return -EPERM;
623 
624         return attr->write(data, buf, count, ppos);
625 }
626 
627 static int blk_mq_debugfs_open(struct inode *inode, struct file *file)
628 {
629         const struct blk_mq_debugfs_attr *attr = inode->i_private;
630         void *data = d_inode(file->f_path.dentry->d_parent)->i_private;
631         struct seq_file *m;
632         int ret;
633 
634         if (attr->seq_ops) {
635                 ret = seq_open(file, attr->seq_ops);
636                 if (!ret) {
637                         m = file->private_data;
638                         m->private = data;
639                 }
640                 return ret;
641         }
642 
643         if (WARN_ON_ONCE(!attr->show))
644                 return -EPERM;
645 
646         return single_open(file, blk_mq_debugfs_show, inode->i_private);
647 }
648 
649 static int blk_mq_debugfs_release(struct inode *inode, struct file *file)
650 {
651         const struct blk_mq_debugfs_attr *attr = inode->i_private;
652 
653         if (attr->show)
654                 return single_release(inode, file);
655 
656         return seq_release(inode, file);
657 }
658 
659 static const struct file_operations blk_mq_debugfs_fops = {
660         .open           = blk_mq_debugfs_open,
661         .read           = seq_read,
662         .write          = blk_mq_debugfs_write,
663         .llseek         = seq_lseek,
664         .release        = blk_mq_debugfs_release,
665 };
666 
667 static const struct blk_mq_debugfs_attr blk_mq_debugfs_hctx_attrs[] = {
668         {"state", 0400, hctx_state_show},
669         {"flags", 0400, hctx_flags_show},
670         {"dispatch", 0400, .seq_ops = &hctx_dispatch_seq_ops},
671         {"busy", 0400, hctx_busy_show},
672         {"ctx_map", 0400, hctx_ctx_map_show},
673         {"tags", 0400, hctx_tags_show},
674         {"tags_bitmap", 0400, hctx_tags_bitmap_show},
675         {"sched_tags", 0400, hctx_sched_tags_show},
676         {"sched_tags_bitmap", 0400, hctx_sched_tags_bitmap_show},
677         {"run", 0600, hctx_run_show, hctx_run_write},
678         {"active", 0400, hctx_active_show},
679         {"dispatch_busy", 0400, hctx_dispatch_busy_show},
680         {"type", 0400, hctx_type_show},
681         {},
682 };
683 
684 static const struct blk_mq_debugfs_attr blk_mq_debugfs_ctx_attrs[] = {
685         {"default_rq_list", 0400, .seq_ops = &ctx_default_rq_list_seq_ops},
686         {"read_rq_list", 0400, .seq_ops = &ctx_read_rq_list_seq_ops},
687         {"poll_rq_list", 0400, .seq_ops = &ctx_poll_rq_list_seq_ops},
688         {},
689 };
690 
691 static void debugfs_create_files(struct dentry *parent, void *data,
692                                  const struct blk_mq_debugfs_attr *attr)
693 {
694         if (IS_ERR_OR_NULL(parent))
695                 return;
696 
697         d_inode(parent)->i_private = data;
698 
699         for (; attr->name; attr++)
700                 debugfs_create_file(attr->name, attr->mode, parent,
701                                     (void *)attr, &blk_mq_debugfs_fops);
702 }
703 
704 void blk_mq_debugfs_register(struct request_queue *q)
705 {
706         struct blk_mq_hw_ctx *hctx;
707         int i;
708 
709         debugfs_create_files(q->debugfs_dir, q, blk_mq_debugfs_queue_attrs);
710 
711         /*
712          * blk_mq_init_sched() attempted to do this already, but q->debugfs_dir
713          * didn't exist yet (because we don't know what to name the directory
714          * until the queue is registered to a gendisk).
715          */
716         if (q->elevator && !q->sched_debugfs_dir)
717                 blk_mq_debugfs_register_sched(q);
718 
719         /* Similarly, blk_mq_init_hctx() couldn't do this previously. */
720         queue_for_each_hw_ctx(q, hctx, i) {
721                 if (!hctx->debugfs_dir)
722                         blk_mq_debugfs_register_hctx(q, hctx);
723                 if (q->elevator && !hctx->sched_debugfs_dir)
724                         blk_mq_debugfs_register_sched_hctx(q, hctx);
725         }
726 
727         if (q->rq_qos) {
728                 struct rq_qos *rqos = q->rq_qos;
729 
730                 while (rqos) {
731                         blk_mq_debugfs_register_rqos(rqos);
732                         rqos = rqos->next;
733                 }
734         }
735 }
736 
737 void blk_mq_debugfs_unregister(struct request_queue *q)
738 {
739         q->sched_debugfs_dir = NULL;
740 }
741 
742 static void blk_mq_debugfs_register_ctx(struct blk_mq_hw_ctx *hctx,
743                                         struct blk_mq_ctx *ctx)
744 {
745         struct dentry *ctx_dir;
746         char name[20];
747 
748         snprintf(name, sizeof(name), "cpu%u", ctx->cpu);
749         ctx_dir = debugfs_create_dir(name, hctx->debugfs_dir);
750 
751         debugfs_create_files(ctx_dir, ctx, blk_mq_debugfs_ctx_attrs);
752 }
753 
754 void blk_mq_debugfs_register_hctx(struct request_queue *q,
755                                   struct blk_mq_hw_ctx *hctx)
756 {
757         struct blk_mq_ctx *ctx;
758         char name[20];
759         int i;
760 
761         snprintf(name, sizeof(name), "hctx%u", hctx->queue_num);
762         hctx->debugfs_dir = debugfs_create_dir(name, q->debugfs_dir);
763 
764         debugfs_create_files(hctx->debugfs_dir, hctx, blk_mq_debugfs_hctx_attrs);
765 
766         hctx_for_each_ctx(hctx, ctx, i)
767                 blk_mq_debugfs_register_ctx(hctx, ctx);
768 }
769 
770 void blk_mq_debugfs_unregister_hctx(struct blk_mq_hw_ctx *hctx)
771 {
772         debugfs_remove_recursive(hctx->debugfs_dir);
773         hctx->sched_debugfs_dir = NULL;
774         hctx->debugfs_dir = NULL;
775 }
776 
777 void blk_mq_debugfs_register_hctxs(struct request_queue *q)
778 {
779         struct blk_mq_hw_ctx *hctx;
780         int i;
781 
782         queue_for_each_hw_ctx(q, hctx, i)
783                 blk_mq_debugfs_register_hctx(q, hctx);
784 }
785 
786 void blk_mq_debugfs_unregister_hctxs(struct request_queue *q)
787 {
788         struct blk_mq_hw_ctx *hctx;
789         int i;
790 
791         queue_for_each_hw_ctx(q, hctx, i)
792                 blk_mq_debugfs_unregister_hctx(hctx);
793 }
794 
795 void blk_mq_debugfs_register_sched(struct request_queue *q)
796 {
797         struct elevator_type *e = q->elevator->type;
798 
799         /*
800          * If the parent directory has not been created yet, return, we will be
801          * called again later on and the directory/files will be created then.
802          */
803         if (!q->debugfs_dir)
804                 return;
805 
806         if (!e->queue_debugfs_attrs)
807                 return;
808 
809         q->sched_debugfs_dir = debugfs_create_dir("sched", q->debugfs_dir);
810 
811         debugfs_create_files(q->sched_debugfs_dir, q, e->queue_debugfs_attrs);
812 }
813 
814 void blk_mq_debugfs_unregister_sched(struct request_queue *q)
815 {
816         debugfs_remove_recursive(q->sched_debugfs_dir);
817         q->sched_debugfs_dir = NULL;
818 }
819 
820 static const char *rq_qos_id_to_name(enum rq_qos_id id)
821 {
822         switch (id) {
823         case RQ_QOS_WBT:
824                 return "wbt";
825         case RQ_QOS_LATENCY:
826                 return "latency";
827         case RQ_QOS_COST:
828                 return "cost";
829         case RQ_QOS_IOPRIO:
830                 return "ioprio";
831         }
832         return "unknown";
833 }
834 
835 void blk_mq_debugfs_unregister_rqos(struct rq_qos *rqos)
836 {
837         debugfs_remove_recursive(rqos->debugfs_dir);
838         rqos->debugfs_dir = NULL;
839 }
840 
841 void blk_mq_debugfs_register_rqos(struct rq_qos *rqos)
842 {
843         struct request_queue *q = rqos->q;
844         const char *dir_name = rq_qos_id_to_name(rqos->id);
845 
846         if (rqos->debugfs_dir || !rqos->ops->debugfs_attrs)
847                 return;
848 
849         if (!q->rqos_debugfs_dir)
850                 q->rqos_debugfs_dir = debugfs_create_dir("rqos",
851                                                          q->debugfs_dir);
852 
853         rqos->debugfs_dir = debugfs_create_dir(dir_name,
854                                                rqos->q->rqos_debugfs_dir);
855 
856         debugfs_create_files(rqos->debugfs_dir, rqos, rqos->ops->debugfs_attrs);
857 }
858 
859 void blk_mq_debugfs_unregister_queue_rqos(struct request_queue *q)
860 {
861         debugfs_remove_recursive(q->rqos_debugfs_dir);
862         q->rqos_debugfs_dir = NULL;
863 }
864 
865 void blk_mq_debugfs_register_sched_hctx(struct request_queue *q,
866                                         struct blk_mq_hw_ctx *hctx)
867 {
868         struct elevator_type *e = q->elevator->type;
869 
870         /*
871          * If the parent debugfs directory has not been created yet, return;
872          * We will be called again later on with appropriate parent debugfs
873          * directory from blk_register_queue()
874          */
875         if (!hctx->debugfs_dir)
876                 return;
877 
878         if (!e->hctx_debugfs_attrs)
879                 return;
880 
881         hctx->sched_debugfs_dir = debugfs_create_dir("sched",
882                                                      hctx->debugfs_dir);
883         debugfs_create_files(hctx->sched_debugfs_dir, hctx,
884                              e->hctx_debugfs_attrs);
885 }
886 
887 void blk_mq_debugfs_unregister_sched_hctx(struct blk_mq_hw_ctx *hctx)
888 {
889         debugfs_remove_recursive(hctx->sched_debugfs_dir);
890         hctx->sched_debugfs_dir = NULL;
891 }
892 

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