1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (C) 2017 Facebook
6 #include <linux/kernel.h>
7 #include <linux/blkdev.h>
8 #include <linux/debugfs.h>
10 #include <linux/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"
18 static void print_stat(struct seq_file
*m
, struct blk_rq_stat
*stat
)
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
);
24 seq_puts(m
, "samples=0");
28 static int queue_poll_stat_show(void *data
, struct seq_file
*m
)
30 struct request_queue
*q
= data
;
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
]);
41 seq_printf(m
, "write (%d Bytes): ", 1 << (9 + bucket
));
42 print_stat(m
, &q
->poll_stat
[2 * bucket
+ 1]);
48 static void *queue_requeue_list_start(struct seq_file
*m
, loff_t
*pos
)
49 __acquires(&q
->requeue_lock
)
51 struct request_queue
*q
= m
->private;
53 spin_lock_irq(&q
->requeue_lock
);
54 return seq_list_start(&q
->requeue_list
, *pos
);
57 static void *queue_requeue_list_next(struct seq_file
*m
, void *v
, loff_t
*pos
)
59 struct request_queue
*q
= m
->private;
61 return seq_list_next(v
, &q
->requeue_list
, pos
);
64 static void queue_requeue_list_stop(struct seq_file
*m
, void *v
)
65 __releases(&q
->requeue_lock
)
67 struct request_queue
*q
= m
->private;
69 spin_unlock_irq(&q
->requeue_lock
);
72 static 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
,
79 static int blk_flags_show(struct seq_file
*m
, const unsigned long flags
,
80 const char *const *flag_name
, int flag_name_count
)
85 for (i
= 0; i
< sizeof(flags
) * BITS_PER_BYTE
; i
++) {
86 if (!(flags
& BIT(i
)))
91 if (i
< flag_name_count
&& flag_name
[i
])
92 seq_puts(m
, flag_name
[i
]);
94 seq_printf(m
, "%d", i
);
99 static int queue_pm_only_show(void *data
, struct seq_file
*m
)
101 struct request_queue
*q
= data
;
103 seq_printf(m
, "%d\n", atomic_read(&q
->pm_only
));
107 #define QUEUE_FLAG_NAME(name) [QUEUE_FLAG_##name] = #name
108 static 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(NOXMERGES
),
117 QUEUE_FLAG_NAME(ADD_RANDOM
),
118 QUEUE_FLAG_NAME(SAME_FORCE
),
119 QUEUE_FLAG_NAME(INIT_DONE
),
120 QUEUE_FLAG_NAME(STABLE_WRITES
),
121 QUEUE_FLAG_NAME(POLL
),
123 QUEUE_FLAG_NAME(FUA
),
124 QUEUE_FLAG_NAME(DAX
),
125 QUEUE_FLAG_NAME(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
),
134 #undef QUEUE_FLAG_NAME
136 static int queue_state_show(void *data
, struct seq_file
*m
)
138 struct request_queue
*q
= data
;
140 blk_flags_show(m
, q
->queue_flags
, blk_queue_flag_name
,
141 ARRAY_SIZE(blk_queue_flag_name
));
146 static ssize_t
queue_state_write(void *data
, const char __user
*buf
,
147 size_t count
, loff_t
*ppos
)
149 struct request_queue
*q
= data
;
150 char opbuf
[16] = { }, *op
;
153 * The "state" attribute is removed when the queue is removed. Don't
154 * allow setting the state on a dying queue to avoid a use-after-free.
156 if (blk_queue_dying(q
))
159 if (count
>= sizeof(opbuf
)) {
160 pr_err("%s: operation too long\n", __func__
);
164 if (copy_from_user(opbuf
, buf
, count
))
166 op
= strstrip(opbuf
);
167 if (strcmp(op
, "run") == 0) {
168 blk_mq_run_hw_queues(q
, true);
169 } else if (strcmp(op
, "start") == 0) {
170 blk_mq_start_stopped_hw_queues(q
, true);
171 } else if (strcmp(op
, "kick") == 0) {
172 blk_mq_kick_requeue_list(q
);
174 pr_err("%s: unsupported operation '%s'\n", __func__
, op
);
176 pr_err("%s: use 'run', 'start' or 'kick'\n", __func__
);
182 static const struct blk_mq_debugfs_attr blk_mq_debugfs_queue_attrs
[] = {
183 { "poll_stat", 0400, queue_poll_stat_show
},
184 { "requeue_list", 0400, .seq_ops
= &queue_requeue_list_seq_ops
},
185 { "pm_only", 0600, queue_pm_only_show
, NULL
},
186 { "state", 0600, queue_state_show
, queue_state_write
},
187 { "zone_wlock", 0400, queue_zone_wlock_show
, NULL
},
191 #define HCTX_STATE_NAME(name) [BLK_MQ_S_##name] = #name
192 static const char *const hctx_state_name
[] = {
193 HCTX_STATE_NAME(STOPPED
),
194 HCTX_STATE_NAME(TAG_ACTIVE
),
195 HCTX_STATE_NAME(SCHED_RESTART
),
196 HCTX_STATE_NAME(INACTIVE
),
198 #undef HCTX_STATE_NAME
200 static int hctx_state_show(void *data
, struct seq_file
*m
)
202 struct blk_mq_hw_ctx
*hctx
= data
;
204 blk_flags_show(m
, hctx
->state
, hctx_state_name
,
205 ARRAY_SIZE(hctx_state_name
));
210 #define BLK_TAG_ALLOC_NAME(name) [BLK_TAG_ALLOC_##name] = #name
211 static const char *const alloc_policy_name
[] = {
212 BLK_TAG_ALLOC_NAME(FIFO
),
213 BLK_TAG_ALLOC_NAME(RR
),
215 #undef BLK_TAG_ALLOC_NAME
217 #define HCTX_FLAG_NAME(name) [ilog2(BLK_MQ_F_##name)] = #name
218 static const char *const hctx_flag_name
[] = {
219 HCTX_FLAG_NAME(SHOULD_MERGE
),
220 HCTX_FLAG_NAME(TAG_QUEUE_SHARED
),
221 HCTX_FLAG_NAME(BLOCKING
),
222 HCTX_FLAG_NAME(NO_SCHED
),
223 HCTX_FLAG_NAME(STACKING
),
224 HCTX_FLAG_NAME(TAG_HCTX_SHARED
),
226 #undef HCTX_FLAG_NAME
228 static int hctx_flags_show(void *data
, struct seq_file
*m
)
230 struct blk_mq_hw_ctx
*hctx
= data
;
231 const int alloc_policy
= BLK_MQ_FLAG_TO_ALLOC_POLICY(hctx
->flags
);
233 seq_puts(m
, "alloc_policy=");
234 if (alloc_policy
< ARRAY_SIZE(alloc_policy_name
) &&
235 alloc_policy_name
[alloc_policy
])
236 seq_puts(m
, alloc_policy_name
[alloc_policy
]);
238 seq_printf(m
, "%d", alloc_policy
);
241 hctx
->flags
^ BLK_ALLOC_POLICY_TO_MQ_FLAG(alloc_policy
),
242 hctx_flag_name
, ARRAY_SIZE(hctx_flag_name
));
247 #define CMD_FLAG_NAME(name) [__REQ_##name] = #name
248 static const char *const cmd_flag_name
[] = {
249 CMD_FLAG_NAME(FAILFAST_DEV
),
250 CMD_FLAG_NAME(FAILFAST_TRANSPORT
),
251 CMD_FLAG_NAME(FAILFAST_DRIVER
),
255 CMD_FLAG_NAME(NOMERGE
),
257 CMD_FLAG_NAME(INTEGRITY
),
259 CMD_FLAG_NAME(PREFLUSH
),
260 CMD_FLAG_NAME(RAHEAD
),
261 CMD_FLAG_NAME(BACKGROUND
),
262 CMD_FLAG_NAME(NOWAIT
),
263 CMD_FLAG_NAME(NOUNMAP
),
264 CMD_FLAG_NAME(POLLED
),
268 #define RQF_NAME(name) [ilog2((__force u32)RQF_##name)] = #name
269 static const char *const rqf_name
[] = {
271 RQF_NAME(SOFTBARRIER
),
273 RQF_NAME(MIXED_MERGE
),
274 RQF_NAME(MQ_INFLIGHT
),
283 RQF_NAME(SPECIAL_PAYLOAD
),
284 RQF_NAME(ZONE_WRITE_LOCKED
),
285 RQF_NAME(MQ_POLL_SLEPT
),
290 static const char *const blk_mq_rq_state_name_array
[] = {
291 [MQ_RQ_IDLE
] = "idle",
292 [MQ_RQ_IN_FLIGHT
] = "in_flight",
293 [MQ_RQ_COMPLETE
] = "complete",
296 static const char *blk_mq_rq_state_name(enum mq_rq_state rq_state
)
298 if (WARN_ON_ONCE((unsigned int)rq_state
>=
299 ARRAY_SIZE(blk_mq_rq_state_name_array
)))
301 return blk_mq_rq_state_name_array
[rq_state
];
304 int __blk_mq_debugfs_rq_show(struct seq_file
*m
, struct request
*rq
)
306 const struct blk_mq_ops
*const mq_ops
= rq
->q
->mq_ops
;
307 const enum req_op op
= req_op(rq
);
308 const char *op_str
= blk_op_str(op
);
310 seq_printf(m
, "%p {.op=", rq
);
311 if (strcmp(op_str
, "UNKNOWN") == 0)
312 seq_printf(m
, "%u", op
);
314 seq_printf(m
, "%s", op_str
);
315 seq_puts(m
, ", .cmd_flags=");
316 blk_flags_show(m
, (__force
unsigned int)(rq
->cmd_flags
& ~REQ_OP_MASK
),
317 cmd_flag_name
, ARRAY_SIZE(cmd_flag_name
));
318 seq_puts(m
, ", .rq_flags=");
319 blk_flags_show(m
, (__force
unsigned int)rq
->rq_flags
, rqf_name
,
320 ARRAY_SIZE(rqf_name
));
321 seq_printf(m
, ", .state=%s", blk_mq_rq_state_name(blk_mq_rq_state(rq
)));
322 seq_printf(m
, ", .tag=%d, .internal_tag=%d", rq
->tag
,
325 mq_ops
->show_rq(m
, rq
);
329 EXPORT_SYMBOL_GPL(__blk_mq_debugfs_rq_show
);
331 int blk_mq_debugfs_rq_show(struct seq_file
*m
, void *v
)
333 return __blk_mq_debugfs_rq_show(m
, list_entry_rq(v
));
335 EXPORT_SYMBOL_GPL(blk_mq_debugfs_rq_show
);
337 static void *hctx_dispatch_start(struct seq_file
*m
, loff_t
*pos
)
338 __acquires(&hctx
->lock
)
340 struct blk_mq_hw_ctx
*hctx
= m
->private;
342 spin_lock(&hctx
->lock
);
343 return seq_list_start(&hctx
->dispatch
, *pos
);
346 static void *hctx_dispatch_next(struct seq_file
*m
, void *v
, loff_t
*pos
)
348 struct blk_mq_hw_ctx
*hctx
= m
->private;
350 return seq_list_next(v
, &hctx
->dispatch
, pos
);
353 static void hctx_dispatch_stop(struct seq_file
*m
, void *v
)
354 __releases(&hctx
->lock
)
356 struct blk_mq_hw_ctx
*hctx
= m
->private;
358 spin_unlock(&hctx
->lock
);
361 static const struct seq_operations hctx_dispatch_seq_ops
= {
362 .start
= hctx_dispatch_start
,
363 .next
= hctx_dispatch_next
,
364 .stop
= hctx_dispatch_stop
,
365 .show
= blk_mq_debugfs_rq_show
,
368 struct show_busy_params
{
370 struct blk_mq_hw_ctx
*hctx
;
374 * Note: the state of a request may change while this function is in progress,
375 * e.g. due to a concurrent blk_mq_finish_request() call. Returns true to
376 * keep iterating requests.
378 static bool hctx_show_busy_rq(struct request
*rq
, void *data
)
380 const struct show_busy_params
*params
= data
;
382 if (rq
->mq_hctx
== params
->hctx
)
383 __blk_mq_debugfs_rq_show(params
->m
, rq
);
388 static int hctx_busy_show(void *data
, struct seq_file
*m
)
390 struct blk_mq_hw_ctx
*hctx
= data
;
391 struct show_busy_params params
= { .m
= m
, .hctx
= hctx
};
393 blk_mq_tagset_busy_iter(hctx
->queue
->tag_set
, hctx_show_busy_rq
,
399 static const char *const hctx_types
[] = {
400 [HCTX_TYPE_DEFAULT
] = "default",
401 [HCTX_TYPE_READ
] = "read",
402 [HCTX_TYPE_POLL
] = "poll",
405 static int hctx_type_show(void *data
, struct seq_file
*m
)
407 struct blk_mq_hw_ctx
*hctx
= data
;
409 BUILD_BUG_ON(ARRAY_SIZE(hctx_types
) != HCTX_MAX_TYPES
);
410 seq_printf(m
, "%s\n", hctx_types
[hctx
->type
]);
414 static int hctx_ctx_map_show(void *data
, struct seq_file
*m
)
416 struct blk_mq_hw_ctx
*hctx
= data
;
418 sbitmap_bitmap_show(&hctx
->ctx_map
, m
);
422 static void blk_mq_debugfs_tags_show(struct seq_file
*m
,
423 struct blk_mq_tags
*tags
)
425 seq_printf(m
, "nr_tags=%u\n", tags
->nr_tags
);
426 seq_printf(m
, "nr_reserved_tags=%u\n", tags
->nr_reserved_tags
);
427 seq_printf(m
, "active_queues=%d\n",
428 atomic_read(&tags
->active_queues
));
430 seq_puts(m
, "\nbitmap_tags:\n");
431 sbitmap_queue_show(&tags
->bitmap_tags
, m
);
433 if (tags
->nr_reserved_tags
) {
434 seq_puts(m
, "\nbreserved_tags:\n");
435 sbitmap_queue_show(&tags
->breserved_tags
, m
);
439 static int hctx_tags_show(void *data
, struct seq_file
*m
)
441 struct blk_mq_hw_ctx
*hctx
= data
;
442 struct request_queue
*q
= hctx
->queue
;
445 res
= mutex_lock_interruptible(&q
->sysfs_lock
);
449 blk_mq_debugfs_tags_show(m
, hctx
->tags
);
450 mutex_unlock(&q
->sysfs_lock
);
456 static int hctx_tags_bitmap_show(void *data
, struct seq_file
*m
)
458 struct blk_mq_hw_ctx
*hctx
= data
;
459 struct request_queue
*q
= hctx
->queue
;
462 res
= mutex_lock_interruptible(&q
->sysfs_lock
);
466 sbitmap_bitmap_show(&hctx
->tags
->bitmap_tags
.sb
, m
);
467 mutex_unlock(&q
->sysfs_lock
);
473 static int hctx_sched_tags_show(void *data
, struct seq_file
*m
)
475 struct blk_mq_hw_ctx
*hctx
= data
;
476 struct request_queue
*q
= hctx
->queue
;
479 res
= mutex_lock_interruptible(&q
->sysfs_lock
);
482 if (hctx
->sched_tags
)
483 blk_mq_debugfs_tags_show(m
, hctx
->sched_tags
);
484 mutex_unlock(&q
->sysfs_lock
);
490 static int hctx_sched_tags_bitmap_show(void *data
, struct seq_file
*m
)
492 struct blk_mq_hw_ctx
*hctx
= data
;
493 struct request_queue
*q
= hctx
->queue
;
496 res
= mutex_lock_interruptible(&q
->sysfs_lock
);
499 if (hctx
->sched_tags
)
500 sbitmap_bitmap_show(&hctx
->sched_tags
->bitmap_tags
.sb
, m
);
501 mutex_unlock(&q
->sysfs_lock
);
507 static int hctx_run_show(void *data
, struct seq_file
*m
)
509 struct blk_mq_hw_ctx
*hctx
= data
;
511 seq_printf(m
, "%lu\n", hctx
->run
);
515 static ssize_t
hctx_run_write(void *data
, const char __user
*buf
, size_t count
,
518 struct blk_mq_hw_ctx
*hctx
= data
;
524 static int hctx_active_show(void *data
, struct seq_file
*m
)
526 struct blk_mq_hw_ctx
*hctx
= data
;
528 seq_printf(m
, "%d\n", __blk_mq_active_requests(hctx
));
532 static int hctx_dispatch_busy_show(void *data
, struct seq_file
*m
)
534 struct blk_mq_hw_ctx
*hctx
= data
;
536 seq_printf(m
, "%u\n", hctx
->dispatch_busy
);
540 #define CTX_RQ_SEQ_OPS(name, type) \
541 static void *ctx_##name##_rq_list_start(struct seq_file *m, loff_t *pos) \
542 __acquires(&ctx->lock) \
544 struct blk_mq_ctx *ctx = m->private; \
546 spin_lock(&ctx->lock); \
547 return seq_list_start(&ctx->rq_lists[type], *pos); \
550 static void *ctx_##name##_rq_list_next(struct seq_file *m, void *v, \
553 struct blk_mq_ctx *ctx = m->private; \
555 return seq_list_next(v, &ctx->rq_lists[type], pos); \
558 static void ctx_##name##_rq_list_stop(struct seq_file *m, void *v) \
559 __releases(&ctx->lock) \
561 struct blk_mq_ctx *ctx = m->private; \
563 spin_unlock(&ctx->lock); \
566 static const struct seq_operations ctx_##name##_rq_list_seq_ops = { \
567 .start = ctx_##name##_rq_list_start, \
568 .next = ctx_##name##_rq_list_next, \
569 .stop = ctx_##name##_rq_list_stop, \
570 .show = blk_mq_debugfs_rq_show, \
573 CTX_RQ_SEQ_OPS(default, HCTX_TYPE_DEFAULT
);
574 CTX_RQ_SEQ_OPS(read
, HCTX_TYPE_READ
);
575 CTX_RQ_SEQ_OPS(poll
, HCTX_TYPE_POLL
);
577 static int blk_mq_debugfs_show(struct seq_file
*m
, void *v
)
579 const struct blk_mq_debugfs_attr
*attr
= m
->private;
580 void *data
= d_inode(m
->file
->f_path
.dentry
->d_parent
)->i_private
;
582 return attr
->show(data
, m
);
585 static ssize_t
blk_mq_debugfs_write(struct file
*file
, const char __user
*buf
,
586 size_t count
, loff_t
*ppos
)
588 struct seq_file
*m
= file
->private_data
;
589 const struct blk_mq_debugfs_attr
*attr
= m
->private;
590 void *data
= d_inode(file
->f_path
.dentry
->d_parent
)->i_private
;
593 * Attributes that only implement .seq_ops are read-only and 'attr' is
594 * the same with 'data' in this case.
596 if (attr
== data
|| !attr
->write
)
599 return attr
->write(data
, buf
, count
, ppos
);
602 static int blk_mq_debugfs_open(struct inode
*inode
, struct file
*file
)
604 const struct blk_mq_debugfs_attr
*attr
= inode
->i_private
;
605 void *data
= d_inode(file
->f_path
.dentry
->d_parent
)->i_private
;
610 ret
= seq_open(file
, attr
->seq_ops
);
612 m
= file
->private_data
;
618 if (WARN_ON_ONCE(!attr
->show
))
621 return single_open(file
, blk_mq_debugfs_show
, inode
->i_private
);
624 static int blk_mq_debugfs_release(struct inode
*inode
, struct file
*file
)
626 const struct blk_mq_debugfs_attr
*attr
= inode
->i_private
;
629 return single_release(inode
, file
);
631 return seq_release(inode
, file
);
634 static const struct file_operations blk_mq_debugfs_fops
= {
635 .open
= blk_mq_debugfs_open
,
637 .write
= blk_mq_debugfs_write
,
639 .release
= blk_mq_debugfs_release
,
642 static const struct blk_mq_debugfs_attr blk_mq_debugfs_hctx_attrs
[] = {
643 {"state", 0400, hctx_state_show
},
644 {"flags", 0400, hctx_flags_show
},
645 {"dispatch", 0400, .seq_ops
= &hctx_dispatch_seq_ops
},
646 {"busy", 0400, hctx_busy_show
},
647 {"ctx_map", 0400, hctx_ctx_map_show
},
648 {"tags", 0400, hctx_tags_show
},
649 {"tags_bitmap", 0400, hctx_tags_bitmap_show
},
650 {"sched_tags", 0400, hctx_sched_tags_show
},
651 {"sched_tags_bitmap", 0400, hctx_sched_tags_bitmap_show
},
652 {"run", 0600, hctx_run_show
, hctx_run_write
},
653 {"active", 0400, hctx_active_show
},
654 {"dispatch_busy", 0400, hctx_dispatch_busy_show
},
655 {"type", 0400, hctx_type_show
},
659 static const struct blk_mq_debugfs_attr blk_mq_debugfs_ctx_attrs
[] = {
660 {"default_rq_list", 0400, .seq_ops
= &ctx_default_rq_list_seq_ops
},
661 {"read_rq_list", 0400, .seq_ops
= &ctx_read_rq_list_seq_ops
},
662 {"poll_rq_list", 0400, .seq_ops
= &ctx_poll_rq_list_seq_ops
},
666 static void debugfs_create_files(struct dentry
*parent
, void *data
,
667 const struct blk_mq_debugfs_attr
*attr
)
669 if (IS_ERR_OR_NULL(parent
))
672 d_inode(parent
)->i_private
= data
;
674 for (; attr
->name
; attr
++)
675 debugfs_create_file(attr
->name
, attr
->mode
, parent
,
676 (void *)attr
, &blk_mq_debugfs_fops
);
679 void blk_mq_debugfs_register(struct request_queue
*q
)
681 struct blk_mq_hw_ctx
*hctx
;
684 debugfs_create_files(q
->debugfs_dir
, q
, blk_mq_debugfs_queue_attrs
);
687 * blk_mq_init_sched() attempted to do this already, but q->debugfs_dir
688 * didn't exist yet (because we don't know what to name the directory
689 * until the queue is registered to a gendisk).
691 if (q
->elevator
&& !q
->sched_debugfs_dir
)
692 blk_mq_debugfs_register_sched(q
);
694 /* Similarly, blk_mq_init_hctx() couldn't do this previously. */
695 queue_for_each_hw_ctx(q
, hctx
, i
) {
696 if (!hctx
->debugfs_dir
)
697 blk_mq_debugfs_register_hctx(q
, hctx
);
698 if (q
->elevator
&& !hctx
->sched_debugfs_dir
)
699 blk_mq_debugfs_register_sched_hctx(q
, hctx
);
703 struct rq_qos
*rqos
= q
->rq_qos
;
706 blk_mq_debugfs_register_rqos(rqos
);
712 static void blk_mq_debugfs_register_ctx(struct blk_mq_hw_ctx
*hctx
,
713 struct blk_mq_ctx
*ctx
)
715 struct dentry
*ctx_dir
;
718 snprintf(name
, sizeof(name
), "cpu%u", ctx
->cpu
);
719 ctx_dir
= debugfs_create_dir(name
, hctx
->debugfs_dir
);
721 debugfs_create_files(ctx_dir
, ctx
, blk_mq_debugfs_ctx_attrs
);
724 void blk_mq_debugfs_register_hctx(struct request_queue
*q
,
725 struct blk_mq_hw_ctx
*hctx
)
727 struct blk_mq_ctx
*ctx
;
734 snprintf(name
, sizeof(name
), "hctx%u", hctx
->queue_num
);
735 hctx
->debugfs_dir
= debugfs_create_dir(name
, q
->debugfs_dir
);
737 debugfs_create_files(hctx
->debugfs_dir
, hctx
, blk_mq_debugfs_hctx_attrs
);
739 hctx_for_each_ctx(hctx
, ctx
, i
)
740 blk_mq_debugfs_register_ctx(hctx
, ctx
);
743 void blk_mq_debugfs_unregister_hctx(struct blk_mq_hw_ctx
*hctx
)
745 if (!hctx
->queue
->debugfs_dir
)
747 debugfs_remove_recursive(hctx
->debugfs_dir
);
748 hctx
->sched_debugfs_dir
= NULL
;
749 hctx
->debugfs_dir
= NULL
;
752 void blk_mq_debugfs_register_hctxs(struct request_queue
*q
)
754 struct blk_mq_hw_ctx
*hctx
;
757 queue_for_each_hw_ctx(q
, hctx
, i
)
758 blk_mq_debugfs_register_hctx(q
, hctx
);
761 void blk_mq_debugfs_unregister_hctxs(struct request_queue
*q
)
763 struct blk_mq_hw_ctx
*hctx
;
766 queue_for_each_hw_ctx(q
, hctx
, i
)
767 blk_mq_debugfs_unregister_hctx(hctx
);
770 void blk_mq_debugfs_register_sched(struct request_queue
*q
)
772 struct elevator_type
*e
= q
->elevator
->type
;
774 lockdep_assert_held(&q
->debugfs_mutex
);
777 * If the parent directory has not been created yet, return, we will be
778 * called again later on and the directory/files will be created then.
783 if (!e
->queue_debugfs_attrs
)
786 q
->sched_debugfs_dir
= debugfs_create_dir("sched", q
->debugfs_dir
);
788 debugfs_create_files(q
->sched_debugfs_dir
, q
, e
->queue_debugfs_attrs
);
791 void blk_mq_debugfs_unregister_sched(struct request_queue
*q
)
793 lockdep_assert_held(&q
->debugfs_mutex
);
795 debugfs_remove_recursive(q
->sched_debugfs_dir
);
796 q
->sched_debugfs_dir
= NULL
;
799 static const char *rq_qos_id_to_name(enum rq_qos_id id
)
814 void blk_mq_debugfs_unregister_rqos(struct rq_qos
*rqos
)
816 lockdep_assert_held(&rqos
->q
->debugfs_mutex
);
818 if (!rqos
->q
->debugfs_dir
)
820 debugfs_remove_recursive(rqos
->debugfs_dir
);
821 rqos
->debugfs_dir
= NULL
;
824 void blk_mq_debugfs_register_rqos(struct rq_qos
*rqos
)
826 struct request_queue
*q
= rqos
->q
;
827 const char *dir_name
= rq_qos_id_to_name(rqos
->id
);
829 lockdep_assert_held(&q
->debugfs_mutex
);
831 if (rqos
->debugfs_dir
|| !rqos
->ops
->debugfs_attrs
)
834 if (!q
->rqos_debugfs_dir
)
835 q
->rqos_debugfs_dir
= debugfs_create_dir("rqos",
838 rqos
->debugfs_dir
= debugfs_create_dir(dir_name
,
839 rqos
->q
->rqos_debugfs_dir
);
841 debugfs_create_files(rqos
->debugfs_dir
, rqos
, rqos
->ops
->debugfs_attrs
);
844 void blk_mq_debugfs_register_sched_hctx(struct request_queue
*q
,
845 struct blk_mq_hw_ctx
*hctx
)
847 struct elevator_type
*e
= q
->elevator
->type
;
849 lockdep_assert_held(&q
->debugfs_mutex
);
852 * If the parent debugfs directory has not been created yet, return;
853 * We will be called again later on with appropriate parent debugfs
854 * directory from blk_register_queue()
856 if (!hctx
->debugfs_dir
)
859 if (!e
->hctx_debugfs_attrs
)
862 hctx
->sched_debugfs_dir
= debugfs_create_dir("sched",
864 debugfs_create_files(hctx
->sched_debugfs_dir
, hctx
,
865 e
->hctx_debugfs_attrs
);
868 void blk_mq_debugfs_unregister_sched_hctx(struct blk_mq_hw_ctx
*hctx
)
870 lockdep_assert_held(&hctx
->queue
->debugfs_mutex
);
872 if (!hctx
->queue
->debugfs_dir
)
874 debugfs_remove_recursive(hctx
->sched_debugfs_dir
);
875 hctx
->sched_debugfs_dir
= NULL
;