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07e4fead OS |
1 | /* |
2 | * Copyright (C) 2017 Facebook | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public | |
6 | * License v2 as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License | |
14 | * along with this program. If not, see <https://www.gnu.org/licenses/>. | |
15 | */ | |
16 | ||
17 | #include <linux/kernel.h> | |
18 | #include <linux/blkdev.h> | |
19 | #include <linux/debugfs.h> | |
20 | ||
21 | #include <linux/blk-mq.h> | |
18fbda91 | 22 | #include "blk.h" |
07e4fead | 23 | #include "blk-mq.h" |
d173a251 | 24 | #include "blk-mq-debugfs.h" |
d96b37c0 | 25 | #include "blk-mq-tag.h" |
07e4fead | 26 | |
1209cb7f BVA |
27 | static void print_stat(struct seq_file *m, struct blk_rq_stat *stat) |
28 | { | |
29 | if (stat->nr_samples) { | |
30 | seq_printf(m, "samples=%d, mean=%lld, min=%llu, max=%llu", | |
31 | stat->nr_samples, stat->mean, stat->min, stat->max); | |
32 | } else { | |
33 | seq_puts(m, "samples=0"); | |
34 | } | |
35 | } | |
36 | ||
37 | static int queue_poll_stat_show(void *data, struct seq_file *m) | |
38 | { | |
39 | struct request_queue *q = data; | |
40 | int bucket; | |
41 | ||
42 | for (bucket = 0; bucket < BLK_MQ_POLL_STATS_BKTS/2; bucket++) { | |
43 | seq_printf(m, "read (%d Bytes): ", 1 << (9+bucket)); | |
44 | print_stat(m, &q->poll_stat[2*bucket]); | |
45 | seq_puts(m, "\n"); | |
46 | ||
47 | seq_printf(m, "write (%d Bytes): ", 1 << (9+bucket)); | |
48 | print_stat(m, &q->poll_stat[2*bucket+1]); | |
49 | seq_puts(m, "\n"); | |
50 | } | |
51 | return 0; | |
52 | } | |
53 | ||
54 | static void *queue_requeue_list_start(struct seq_file *m, loff_t *pos) | |
55 | __acquires(&q->requeue_lock) | |
56 | { | |
57 | struct request_queue *q = m->private; | |
58 | ||
59 | spin_lock_irq(&q->requeue_lock); | |
60 | return seq_list_start(&q->requeue_list, *pos); | |
61 | } | |
62 | ||
63 | static void *queue_requeue_list_next(struct seq_file *m, void *v, loff_t *pos) | |
64 | { | |
65 | struct request_queue *q = m->private; | |
66 | ||
67 | return seq_list_next(v, &q->requeue_list, pos); | |
68 | } | |
69 | ||
70 | static void queue_requeue_list_stop(struct seq_file *m, void *v) | |
71 | __releases(&q->requeue_lock) | |
72 | { | |
73 | struct request_queue *q = m->private; | |
74 | ||
75 | spin_unlock_irq(&q->requeue_lock); | |
76 | } | |
77 | ||
78 | static const struct seq_operations queue_requeue_list_seq_ops = { | |
79 | .start = queue_requeue_list_start, | |
80 | .next = queue_requeue_list_next, | |
81 | .stop = queue_requeue_list_stop, | |
82 | .show = blk_mq_debugfs_rq_show, | |
83 | }; | |
84 | ||
91d68905 BVA |
85 | static int blk_flags_show(struct seq_file *m, const unsigned long flags, |
86 | const char *const *flag_name, int flag_name_count) | |
87 | { | |
88 | bool sep = false; | |
89 | int i; | |
90 | ||
91 | for (i = 0; i < sizeof(flags) * BITS_PER_BYTE; i++) { | |
92 | if (!(flags & BIT(i))) | |
93 | continue; | |
94 | if (sep) | |
bec03d6b | 95 | seq_puts(m, "|"); |
91d68905 BVA |
96 | sep = true; |
97 | if (i < flag_name_count && flag_name[i]) | |
98 | seq_puts(m, flag_name[i]); | |
99 | else | |
100 | seq_printf(m, "%d", i); | |
101 | } | |
91d68905 BVA |
102 | return 0; |
103 | } | |
104 | ||
cd84a62e BVA |
105 | static int queue_pm_only_show(void *data, struct seq_file *m) |
106 | { | |
107 | struct request_queue *q = data; | |
108 | ||
109 | seq_printf(m, "%d\n", atomic_read(&q->pm_only)); | |
110 | return 0; | |
111 | } | |
112 | ||
1a435111 | 113 | #define QUEUE_FLAG_NAME(name) [QUEUE_FLAG_##name] = #name |
91d68905 | 114 | static const char *const blk_queue_flag_name[] = { |
1a435111 | 115 | QUEUE_FLAG_NAME(STOPPED), |
1a435111 OS |
116 | QUEUE_FLAG_NAME(DYING), |
117 | QUEUE_FLAG_NAME(BYPASS), | |
118 | QUEUE_FLAG_NAME(BIDI), | |
119 | QUEUE_FLAG_NAME(NOMERGES), | |
120 | QUEUE_FLAG_NAME(SAME_COMP), | |
121 | QUEUE_FLAG_NAME(FAIL_IO), | |
1a435111 OS |
122 | QUEUE_FLAG_NAME(NONROT), |
123 | QUEUE_FLAG_NAME(IO_STAT), | |
124 | QUEUE_FLAG_NAME(DISCARD), | |
125 | QUEUE_FLAG_NAME(NOXMERGES), | |
126 | QUEUE_FLAG_NAME(ADD_RANDOM), | |
127 | QUEUE_FLAG_NAME(SECERASE), | |
128 | QUEUE_FLAG_NAME(SAME_FORCE), | |
129 | QUEUE_FLAG_NAME(DEAD), | |
130 | QUEUE_FLAG_NAME(INIT_DONE), | |
131 | QUEUE_FLAG_NAME(NO_SG_MERGE), | |
132 | QUEUE_FLAG_NAME(POLL), | |
133 | QUEUE_FLAG_NAME(WC), | |
134 | QUEUE_FLAG_NAME(FUA), | |
135 | QUEUE_FLAG_NAME(FLUSH_NQ), | |
136 | QUEUE_FLAG_NAME(DAX), | |
137 | QUEUE_FLAG_NAME(STATS), | |
138 | QUEUE_FLAG_NAME(POLL_STATS), | |
139 | QUEUE_FLAG_NAME(REGISTERED), | |
22d53821 BVA |
140 | QUEUE_FLAG_NAME(SCSI_PASSTHROUGH), |
141 | QUEUE_FLAG_NAME(QUIESCED), | |
91d68905 | 142 | }; |
1a435111 | 143 | #undef QUEUE_FLAG_NAME |
91d68905 | 144 | |
f57de23a | 145 | static int queue_state_show(void *data, struct seq_file *m) |
91d68905 | 146 | { |
f57de23a | 147 | struct request_queue *q = data; |
91d68905 BVA |
148 | |
149 | blk_flags_show(m, q->queue_flags, blk_queue_flag_name, | |
150 | ARRAY_SIZE(blk_queue_flag_name)); | |
fd07dc81 | 151 | seq_puts(m, "\n"); |
91d68905 BVA |
152 | return 0; |
153 | } | |
154 | ||
f57de23a OS |
155 | static ssize_t queue_state_write(void *data, const char __user *buf, |
156 | size_t count, loff_t *ppos) | |
91d68905 | 157 | { |
f57de23a | 158 | struct request_queue *q = data; |
71b90511 | 159 | char opbuf[16] = { }, *op; |
91d68905 | 160 | |
18d4d7d0 BVA |
161 | /* |
162 | * The "state" attribute is removed after blk_cleanup_queue() has called | |
163 | * blk_mq_free_queue(). Return if QUEUE_FLAG_DEAD has been set to avoid | |
164 | * triggering a use-after-free. | |
165 | */ | |
166 | if (blk_queue_dead(q)) | |
167 | return -ENOENT; | |
168 | ||
71b90511 | 169 | if (count >= sizeof(opbuf)) { |
c7e4145a OS |
170 | pr_err("%s: operation too long\n", __func__); |
171 | goto inval; | |
172 | } | |
173 | ||
71b90511 | 174 | if (copy_from_user(opbuf, buf, count)) |
91d68905 | 175 | return -EFAULT; |
71b90511 | 176 | op = strstrip(opbuf); |
91d68905 BVA |
177 | if (strcmp(op, "run") == 0) { |
178 | blk_mq_run_hw_queues(q, true); | |
179 | } else if (strcmp(op, "start") == 0) { | |
180 | blk_mq_start_stopped_hw_queues(q, true); | |
edea55ab BVA |
181 | } else if (strcmp(op, "kick") == 0) { |
182 | blk_mq_kick_requeue_list(q); | |
91d68905 | 183 | } else { |
c7e4145a OS |
184 | pr_err("%s: unsupported operation '%s'\n", __func__, op); |
185 | inval: | |
edea55ab | 186 | pr_err("%s: use 'run', 'start' or 'kick'\n", __func__); |
91d68905 BVA |
187 | return -EINVAL; |
188 | } | |
c7e4145a | 189 | return count; |
91d68905 BVA |
190 | } |
191 | ||
f793dfd3 JA |
192 | static int queue_write_hint_show(void *data, struct seq_file *m) |
193 | { | |
194 | struct request_queue *q = data; | |
195 | int i; | |
196 | ||
197 | for (i = 0; i < BLK_MAX_WRITE_HINTS; i++) | |
198 | seq_printf(m, "hint%d: %llu\n", i, q->write_hints[i]); | |
199 | ||
200 | return 0; | |
201 | } | |
202 | ||
203 | static ssize_t queue_write_hint_store(void *data, const char __user *buf, | |
204 | size_t count, loff_t *ppos) | |
205 | { | |
206 | struct request_queue *q = data; | |
207 | int i; | |
208 | ||
209 | for (i = 0; i < BLK_MAX_WRITE_HINTS; i++) | |
210 | q->write_hints[i] = 0; | |
211 | ||
212 | return count; | |
213 | } | |
214 | ||
1209cb7f BVA |
215 | static const struct blk_mq_debugfs_attr blk_mq_debugfs_queue_attrs[] = { |
216 | { "poll_stat", 0400, queue_poll_stat_show }, | |
217 | { "requeue_list", 0400, .seq_ops = &queue_requeue_list_seq_ops }, | |
cd84a62e | 218 | { "pm_only", 0600, queue_pm_only_show, NULL }, |
1209cb7f BVA |
219 | { "state", 0600, queue_state_show, queue_state_write }, |
220 | { "write_hints", 0600, queue_write_hint_show, queue_write_hint_store }, | |
18bc4230 | 221 | { "zone_wlock", 0400, queue_zone_wlock_show, NULL }, |
1209cb7f BVA |
222 | { }, |
223 | }; | |
34dbad5d | 224 | |
1a435111 | 225 | #define HCTX_STATE_NAME(name) [BLK_MQ_S_##name] = #name |
f5c0b091 | 226 | static const char *const hctx_state_name[] = { |
1a435111 OS |
227 | HCTX_STATE_NAME(STOPPED), |
228 | HCTX_STATE_NAME(TAG_ACTIVE), | |
229 | HCTX_STATE_NAME(SCHED_RESTART), | |
f5c0b091 | 230 | }; |
1a435111 OS |
231 | #undef HCTX_STATE_NAME |
232 | ||
f57de23a | 233 | static int hctx_state_show(void *data, struct seq_file *m) |
9abb2ad2 | 234 | { |
f57de23a | 235 | struct blk_mq_hw_ctx *hctx = data; |
9abb2ad2 | 236 | |
f5c0b091 BVA |
237 | blk_flags_show(m, hctx->state, hctx_state_name, |
238 | ARRAY_SIZE(hctx_state_name)); | |
fd07dc81 | 239 | seq_puts(m, "\n"); |
9abb2ad2 OS |
240 | return 0; |
241 | } | |
242 | ||
1a435111 | 243 | #define BLK_TAG_ALLOC_NAME(name) [BLK_TAG_ALLOC_##name] = #name |
f5c0b091 | 244 | static const char *const alloc_policy_name[] = { |
1a435111 OS |
245 | BLK_TAG_ALLOC_NAME(FIFO), |
246 | BLK_TAG_ALLOC_NAME(RR), | |
f5c0b091 | 247 | }; |
1a435111 | 248 | #undef BLK_TAG_ALLOC_NAME |
f5c0b091 | 249 | |
1a435111 | 250 | #define HCTX_FLAG_NAME(name) [ilog2(BLK_MQ_F_##name)] = #name |
f5c0b091 | 251 | static const char *const hctx_flag_name[] = { |
1a435111 OS |
252 | HCTX_FLAG_NAME(SHOULD_MERGE), |
253 | HCTX_FLAG_NAME(TAG_SHARED), | |
254 | HCTX_FLAG_NAME(SG_MERGE), | |
255 | HCTX_FLAG_NAME(BLOCKING), | |
256 | HCTX_FLAG_NAME(NO_SCHED), | |
f5c0b091 | 257 | }; |
1a435111 | 258 | #undef HCTX_FLAG_NAME |
f5c0b091 | 259 | |
f57de23a | 260 | static int hctx_flags_show(void *data, struct seq_file *m) |
9abb2ad2 | 261 | { |
f57de23a | 262 | struct blk_mq_hw_ctx *hctx = data; |
f5c0b091 | 263 | const int alloc_policy = BLK_MQ_FLAG_TO_ALLOC_POLICY(hctx->flags); |
9abb2ad2 | 264 | |
f5c0b091 BVA |
265 | seq_puts(m, "alloc_policy="); |
266 | if (alloc_policy < ARRAY_SIZE(alloc_policy_name) && | |
267 | alloc_policy_name[alloc_policy]) | |
268 | seq_puts(m, alloc_policy_name[alloc_policy]); | |
269 | else | |
270 | seq_printf(m, "%d", alloc_policy); | |
271 | seq_puts(m, " "); | |
272 | blk_flags_show(m, | |
273 | hctx->flags ^ BLK_ALLOC_POLICY_TO_MQ_FLAG(alloc_policy), | |
274 | hctx_flag_name, ARRAY_SIZE(hctx_flag_name)); | |
fd07dc81 | 275 | seq_puts(m, "\n"); |
9abb2ad2 OS |
276 | return 0; |
277 | } | |
278 | ||
1a435111 | 279 | #define REQ_OP_NAME(name) [REQ_OP_##name] = #name |
8658dca8 | 280 | static const char *const op_name[] = { |
1a435111 OS |
281 | REQ_OP_NAME(READ), |
282 | REQ_OP_NAME(WRITE), | |
283 | REQ_OP_NAME(FLUSH), | |
284 | REQ_OP_NAME(DISCARD), | |
1a435111 OS |
285 | REQ_OP_NAME(SECURE_ERASE), |
286 | REQ_OP_NAME(ZONE_RESET), | |
287 | REQ_OP_NAME(WRITE_SAME), | |
288 | REQ_OP_NAME(WRITE_ZEROES), | |
289 | REQ_OP_NAME(SCSI_IN), | |
290 | REQ_OP_NAME(SCSI_OUT), | |
291 | REQ_OP_NAME(DRV_IN), | |
292 | REQ_OP_NAME(DRV_OUT), | |
8658dca8 | 293 | }; |
1a435111 | 294 | #undef REQ_OP_NAME |
8658dca8 | 295 | |
1a435111 | 296 | #define CMD_FLAG_NAME(name) [__REQ_##name] = #name |
8658dca8 | 297 | static const char *const cmd_flag_name[] = { |
1a435111 OS |
298 | CMD_FLAG_NAME(FAILFAST_DEV), |
299 | CMD_FLAG_NAME(FAILFAST_TRANSPORT), | |
300 | CMD_FLAG_NAME(FAILFAST_DRIVER), | |
301 | CMD_FLAG_NAME(SYNC), | |
302 | CMD_FLAG_NAME(META), | |
303 | CMD_FLAG_NAME(PRIO), | |
304 | CMD_FLAG_NAME(NOMERGE), | |
305 | CMD_FLAG_NAME(IDLE), | |
306 | CMD_FLAG_NAME(INTEGRITY), | |
307 | CMD_FLAG_NAME(FUA), | |
308 | CMD_FLAG_NAME(PREFLUSH), | |
309 | CMD_FLAG_NAME(RAHEAD), | |
310 | CMD_FLAG_NAME(BACKGROUND), | |
311 | CMD_FLAG_NAME(NOUNMAP), | |
22d53821 | 312 | CMD_FLAG_NAME(NOWAIT), |
8658dca8 | 313 | }; |
1a435111 | 314 | #undef CMD_FLAG_NAME |
8658dca8 | 315 | |
1a435111 | 316 | #define RQF_NAME(name) [ilog2((__force u32)RQF_##name)] = #name |
8658dca8 | 317 | static const char *const rqf_name[] = { |
1a435111 | 318 | RQF_NAME(SORTED), |
85ba3eff | 319 | RQF_NAME(STARTED), |
1a435111 OS |
320 | RQF_NAME(SOFTBARRIER), |
321 | RQF_NAME(FLUSH_SEQ), | |
322 | RQF_NAME(MIXED_MERGE), | |
323 | RQF_NAME(MQ_INFLIGHT), | |
324 | RQF_NAME(DONTPREP), | |
325 | RQF_NAME(PREEMPT), | |
326 | RQF_NAME(COPY_USER), | |
327 | RQF_NAME(FAILED), | |
328 | RQF_NAME(QUIET), | |
329 | RQF_NAME(ELVPRIV), | |
330 | RQF_NAME(IO_STAT), | |
331 | RQF_NAME(ALLOCED), | |
332 | RQF_NAME(PM), | |
333 | RQF_NAME(HASHED), | |
334 | RQF_NAME(STATS), | |
335 | RQF_NAME(SPECIAL_PAYLOAD), | |
5d75d3f2 | 336 | RQF_NAME(ZONE_WRITE_LOCKED), |
76a86f9d | 337 | RQF_NAME(MQ_POLL_SLEPT), |
8658dca8 | 338 | }; |
1a435111 | 339 | #undef RQF_NAME |
8658dca8 | 340 | |
ec6dcf63 BVA |
341 | static const char *const blk_mq_rq_state_name_array[] = { |
342 | [MQ_RQ_IDLE] = "idle", | |
343 | [MQ_RQ_IN_FLIGHT] = "in_flight", | |
344 | [MQ_RQ_COMPLETE] = "complete", | |
345 | }; | |
346 | ||
347 | static const char *blk_mq_rq_state_name(enum mq_rq_state rq_state) | |
348 | { | |
a1e79188 | 349 | if (WARN_ON_ONCE((unsigned int)rq_state >= |
ec6dcf63 BVA |
350 | ARRAY_SIZE(blk_mq_rq_state_name_array))) |
351 | return "(?)"; | |
352 | return blk_mq_rq_state_name_array[rq_state]; | |
353 | } | |
354 | ||
daaadb3e | 355 | int __blk_mq_debugfs_rq_show(struct seq_file *m, struct request *rq) |
950cd7e9 | 356 | { |
2836ee4b | 357 | const struct blk_mq_ops *const mq_ops = rq->q->mq_ops; |
8658dca8 | 358 | const unsigned int op = rq->cmd_flags & REQ_OP_MASK; |
950cd7e9 | 359 | |
8658dca8 BVA |
360 | seq_printf(m, "%p {.op=", rq); |
361 | if (op < ARRAY_SIZE(op_name) && op_name[op]) | |
362 | seq_printf(m, "%s", op_name[op]); | |
363 | else | |
364 | seq_printf(m, "%d", op); | |
365 | seq_puts(m, ", .cmd_flags="); | |
366 | blk_flags_show(m, rq->cmd_flags & ~REQ_OP_MASK, cmd_flag_name, | |
367 | ARRAY_SIZE(cmd_flag_name)); | |
368 | seq_puts(m, ", .rq_flags="); | |
369 | blk_flags_show(m, (__force unsigned int)rq->rq_flags, rqf_name, | |
370 | ARRAY_SIZE(rqf_name)); | |
ec6dcf63 | 371 | seq_printf(m, ", .state=%s", blk_mq_rq_state_name(blk_mq_rq_state(rq))); |
2836ee4b | 372 | seq_printf(m, ", .tag=%d, .internal_tag=%d", rq->tag, |
8658dca8 | 373 | rq->internal_tag); |
2836ee4b BVA |
374 | if (mq_ops->show_rq) |
375 | mq_ops->show_rq(m, rq); | |
376 | seq_puts(m, "}\n"); | |
950cd7e9 OS |
377 | return 0; |
378 | } | |
daaadb3e OS |
379 | EXPORT_SYMBOL_GPL(__blk_mq_debugfs_rq_show); |
380 | ||
381 | int blk_mq_debugfs_rq_show(struct seq_file *m, void *v) | |
382 | { | |
383 | return __blk_mq_debugfs_rq_show(m, list_entry_rq(v)); | |
384 | } | |
16b738f6 | 385 | EXPORT_SYMBOL_GPL(blk_mq_debugfs_rq_show); |
950cd7e9 OS |
386 | |
387 | static void *hctx_dispatch_start(struct seq_file *m, loff_t *pos) | |
f3bcb0e6 | 388 | __acquires(&hctx->lock) |
950cd7e9 OS |
389 | { |
390 | struct blk_mq_hw_ctx *hctx = m->private; | |
391 | ||
392 | spin_lock(&hctx->lock); | |
393 | return seq_list_start(&hctx->dispatch, *pos); | |
394 | } | |
395 | ||
396 | static void *hctx_dispatch_next(struct seq_file *m, void *v, loff_t *pos) | |
397 | { | |
398 | struct blk_mq_hw_ctx *hctx = m->private; | |
399 | ||
400 | return seq_list_next(v, &hctx->dispatch, pos); | |
401 | } | |
402 | ||
403 | static void hctx_dispatch_stop(struct seq_file *m, void *v) | |
f3bcb0e6 | 404 | __releases(&hctx->lock) |
950cd7e9 OS |
405 | { |
406 | struct blk_mq_hw_ctx *hctx = m->private; | |
407 | ||
408 | spin_unlock(&hctx->lock); | |
409 | } | |
410 | ||
411 | static const struct seq_operations hctx_dispatch_seq_ops = { | |
412 | .start = hctx_dispatch_start, | |
413 | .next = hctx_dispatch_next, | |
414 | .stop = hctx_dispatch_stop, | |
415 | .show = blk_mq_debugfs_rq_show, | |
416 | }; | |
417 | ||
2720bab5 BVA |
418 | struct show_busy_params { |
419 | struct seq_file *m; | |
420 | struct blk_mq_hw_ctx *hctx; | |
421 | }; | |
422 | ||
423 | /* | |
424 | * Note: the state of a request may change while this function is in progress, | |
7baa8572 JA |
425 | * e.g. due to a concurrent blk_mq_finish_request() call. Returns true to |
426 | * keep iterating requests. | |
2720bab5 | 427 | */ |
7baa8572 | 428 | static bool hctx_show_busy_rq(struct request *rq, void *data, bool reserved) |
2720bab5 BVA |
429 | { |
430 | const struct show_busy_params *params = data; | |
431 | ||
ea4f995e | 432 | if (rq->mq_hctx == params->hctx) |
2720bab5 BVA |
433 | __blk_mq_debugfs_rq_show(params->m, |
434 | list_entry_rq(&rq->queuelist)); | |
7baa8572 JA |
435 | |
436 | return true; | |
2720bab5 BVA |
437 | } |
438 | ||
439 | static int hctx_busy_show(void *data, struct seq_file *m) | |
440 | { | |
441 | struct blk_mq_hw_ctx *hctx = data; | |
442 | struct show_busy_params params = { .m = m, .hctx = hctx }; | |
443 | ||
444 | blk_mq_tagset_busy_iter(hctx->queue->tag_set, hctx_show_busy_rq, | |
445 | ¶ms); | |
446 | ||
447 | return 0; | |
448 | } | |
449 | ||
f57de23a | 450 | static int hctx_ctx_map_show(void *data, struct seq_file *m) |
0bfa5288 | 451 | { |
f57de23a | 452 | struct blk_mq_hw_ctx *hctx = data; |
0bfa5288 OS |
453 | |
454 | sbitmap_bitmap_show(&hctx->ctx_map, m); | |
455 | return 0; | |
456 | } | |
457 | ||
d96b37c0 OS |
458 | static void blk_mq_debugfs_tags_show(struct seq_file *m, |
459 | struct blk_mq_tags *tags) | |
460 | { | |
461 | seq_printf(m, "nr_tags=%u\n", tags->nr_tags); | |
462 | seq_printf(m, "nr_reserved_tags=%u\n", tags->nr_reserved_tags); | |
463 | seq_printf(m, "active_queues=%d\n", | |
464 | atomic_read(&tags->active_queues)); | |
465 | ||
466 | seq_puts(m, "\nbitmap_tags:\n"); | |
467 | sbitmap_queue_show(&tags->bitmap_tags, m); | |
468 | ||
469 | if (tags->nr_reserved_tags) { | |
470 | seq_puts(m, "\nbreserved_tags:\n"); | |
471 | sbitmap_queue_show(&tags->breserved_tags, m); | |
472 | } | |
473 | } | |
474 | ||
f57de23a | 475 | static int hctx_tags_show(void *data, struct seq_file *m) |
d96b37c0 | 476 | { |
f57de23a | 477 | struct blk_mq_hw_ctx *hctx = data; |
d96b37c0 | 478 | struct request_queue *q = hctx->queue; |
8c0f14ea | 479 | int res; |
d96b37c0 | 480 | |
8c0f14ea BVA |
481 | res = mutex_lock_interruptible(&q->sysfs_lock); |
482 | if (res) | |
483 | goto out; | |
d96b37c0 OS |
484 | if (hctx->tags) |
485 | blk_mq_debugfs_tags_show(m, hctx->tags); | |
486 | mutex_unlock(&q->sysfs_lock); | |
487 | ||
8c0f14ea BVA |
488 | out: |
489 | return res; | |
d96b37c0 OS |
490 | } |
491 | ||
f57de23a | 492 | static int hctx_tags_bitmap_show(void *data, struct seq_file *m) |
d7e3621a | 493 | { |
f57de23a | 494 | struct blk_mq_hw_ctx *hctx = data; |
d7e3621a | 495 | struct request_queue *q = hctx->queue; |
8c0f14ea | 496 | int res; |
d7e3621a | 497 | |
8c0f14ea BVA |
498 | res = mutex_lock_interruptible(&q->sysfs_lock); |
499 | if (res) | |
500 | goto out; | |
d7e3621a OS |
501 | if (hctx->tags) |
502 | sbitmap_bitmap_show(&hctx->tags->bitmap_tags.sb, m); | |
503 | mutex_unlock(&q->sysfs_lock); | |
8c0f14ea BVA |
504 | |
505 | out: | |
506 | return res; | |
d7e3621a OS |
507 | } |
508 | ||
f57de23a | 509 | static int hctx_sched_tags_show(void *data, struct seq_file *m) |
d96b37c0 | 510 | { |
f57de23a | 511 | struct blk_mq_hw_ctx *hctx = data; |
d96b37c0 | 512 | struct request_queue *q = hctx->queue; |
8c0f14ea | 513 | int res; |
d96b37c0 | 514 | |
8c0f14ea BVA |
515 | res = mutex_lock_interruptible(&q->sysfs_lock); |
516 | if (res) | |
517 | goto out; | |
d96b37c0 OS |
518 | if (hctx->sched_tags) |
519 | blk_mq_debugfs_tags_show(m, hctx->sched_tags); | |
520 | mutex_unlock(&q->sysfs_lock); | |
521 | ||
8c0f14ea BVA |
522 | out: |
523 | return res; | |
d96b37c0 OS |
524 | } |
525 | ||
f57de23a | 526 | static int hctx_sched_tags_bitmap_show(void *data, struct seq_file *m) |
d7e3621a | 527 | { |
f57de23a | 528 | struct blk_mq_hw_ctx *hctx = data; |
d7e3621a | 529 | struct request_queue *q = hctx->queue; |
8c0f14ea | 530 | int res; |
d7e3621a | 531 | |
8c0f14ea BVA |
532 | res = mutex_lock_interruptible(&q->sysfs_lock); |
533 | if (res) | |
534 | goto out; | |
d7e3621a OS |
535 | if (hctx->sched_tags) |
536 | sbitmap_bitmap_show(&hctx->sched_tags->bitmap_tags.sb, m); | |
537 | mutex_unlock(&q->sysfs_lock); | |
8c0f14ea BVA |
538 | |
539 | out: | |
540 | return res; | |
d7e3621a OS |
541 | } |
542 | ||
f57de23a | 543 | static int hctx_io_poll_show(void *data, struct seq_file *m) |
be215473 | 544 | { |
f57de23a | 545 | struct blk_mq_hw_ctx *hctx = data; |
be215473 OS |
546 | |
547 | seq_printf(m, "considered=%lu\n", hctx->poll_considered); | |
548 | seq_printf(m, "invoked=%lu\n", hctx->poll_invoked); | |
549 | seq_printf(m, "success=%lu\n", hctx->poll_success); | |
550 | return 0; | |
551 | } | |
552 | ||
f57de23a | 553 | static ssize_t hctx_io_poll_write(void *data, const char __user *buf, |
be215473 OS |
554 | size_t count, loff_t *ppos) |
555 | { | |
f57de23a | 556 | struct blk_mq_hw_ctx *hctx = data; |
be215473 OS |
557 | |
558 | hctx->poll_considered = hctx->poll_invoked = hctx->poll_success = 0; | |
559 | return count; | |
560 | } | |
561 | ||
f57de23a | 562 | static int hctx_dispatched_show(void *data, struct seq_file *m) |
be215473 | 563 | { |
f57de23a | 564 | struct blk_mq_hw_ctx *hctx = data; |
be215473 OS |
565 | int i; |
566 | ||
567 | seq_printf(m, "%8u\t%lu\n", 0U, hctx->dispatched[0]); | |
568 | ||
569 | for (i = 1; i < BLK_MQ_MAX_DISPATCH_ORDER - 1; i++) { | |
570 | unsigned int d = 1U << (i - 1); | |
571 | ||
572 | seq_printf(m, "%8u\t%lu\n", d, hctx->dispatched[i]); | |
573 | } | |
574 | ||
575 | seq_printf(m, "%8u+\t%lu\n", 1U << (i - 1), hctx->dispatched[i]); | |
576 | return 0; | |
577 | } | |
578 | ||
f57de23a | 579 | static ssize_t hctx_dispatched_write(void *data, const char __user *buf, |
be215473 OS |
580 | size_t count, loff_t *ppos) |
581 | { | |
f57de23a | 582 | struct blk_mq_hw_ctx *hctx = data; |
be215473 OS |
583 | int i; |
584 | ||
585 | for (i = 0; i < BLK_MQ_MAX_DISPATCH_ORDER; i++) | |
586 | hctx->dispatched[i] = 0; | |
587 | return count; | |
588 | } | |
589 | ||
f57de23a | 590 | static int hctx_queued_show(void *data, struct seq_file *m) |
4a46f05e | 591 | { |
f57de23a | 592 | struct blk_mq_hw_ctx *hctx = data; |
4a46f05e OS |
593 | |
594 | seq_printf(m, "%lu\n", hctx->queued); | |
595 | return 0; | |
596 | } | |
597 | ||
f57de23a | 598 | static ssize_t hctx_queued_write(void *data, const char __user *buf, |
4a46f05e OS |
599 | size_t count, loff_t *ppos) |
600 | { | |
f57de23a | 601 | struct blk_mq_hw_ctx *hctx = data; |
4a46f05e OS |
602 | |
603 | hctx->queued = 0; | |
604 | return count; | |
605 | } | |
606 | ||
f57de23a | 607 | static int hctx_run_show(void *data, struct seq_file *m) |
4a46f05e | 608 | { |
f57de23a | 609 | struct blk_mq_hw_ctx *hctx = data; |
4a46f05e OS |
610 | |
611 | seq_printf(m, "%lu\n", hctx->run); | |
612 | return 0; | |
613 | } | |
614 | ||
f57de23a OS |
615 | static ssize_t hctx_run_write(void *data, const char __user *buf, size_t count, |
616 | loff_t *ppos) | |
4a46f05e | 617 | { |
f57de23a | 618 | struct blk_mq_hw_ctx *hctx = data; |
4a46f05e OS |
619 | |
620 | hctx->run = 0; | |
621 | return count; | |
622 | } | |
623 | ||
f57de23a | 624 | static int hctx_active_show(void *data, struct seq_file *m) |
4a46f05e | 625 | { |
f57de23a | 626 | struct blk_mq_hw_ctx *hctx = data; |
4a46f05e OS |
627 | |
628 | seq_printf(m, "%d\n", atomic_read(&hctx->nr_active)); | |
629 | return 0; | |
630 | } | |
631 | ||
6e768717 ML |
632 | static int hctx_dispatch_busy_show(void *data, struct seq_file *m) |
633 | { | |
634 | struct blk_mq_hw_ctx *hctx = data; | |
635 | ||
636 | seq_printf(m, "%u\n", hctx->dispatch_busy); | |
637 | return 0; | |
638 | } | |
639 | ||
950cd7e9 | 640 | static void *ctx_rq_list_start(struct seq_file *m, loff_t *pos) |
f3bcb0e6 | 641 | __acquires(&ctx->lock) |
950cd7e9 OS |
642 | { |
643 | struct blk_mq_ctx *ctx = m->private; | |
644 | ||
645 | spin_lock(&ctx->lock); | |
646 | return seq_list_start(&ctx->rq_list, *pos); | |
647 | } | |
648 | ||
649 | static void *ctx_rq_list_next(struct seq_file *m, void *v, loff_t *pos) | |
650 | { | |
651 | struct blk_mq_ctx *ctx = m->private; | |
652 | ||
653 | return seq_list_next(v, &ctx->rq_list, pos); | |
654 | } | |
655 | ||
656 | static void ctx_rq_list_stop(struct seq_file *m, void *v) | |
f3bcb0e6 | 657 | __releases(&ctx->lock) |
950cd7e9 OS |
658 | { |
659 | struct blk_mq_ctx *ctx = m->private; | |
660 | ||
661 | spin_unlock(&ctx->lock); | |
662 | } | |
663 | ||
664 | static const struct seq_operations ctx_rq_list_seq_ops = { | |
665 | .start = ctx_rq_list_start, | |
666 | .next = ctx_rq_list_next, | |
667 | .stop = ctx_rq_list_stop, | |
668 | .show = blk_mq_debugfs_rq_show, | |
669 | }; | |
f57de23a | 670 | static int ctx_dispatched_show(void *data, struct seq_file *m) |
4a46f05e | 671 | { |
f57de23a | 672 | struct blk_mq_ctx *ctx = data; |
4a46f05e OS |
673 | |
674 | seq_printf(m, "%lu %lu\n", ctx->rq_dispatched[1], ctx->rq_dispatched[0]); | |
675 | return 0; | |
676 | } | |
677 | ||
f57de23a | 678 | static ssize_t ctx_dispatched_write(void *data, const char __user *buf, |
4a46f05e OS |
679 | size_t count, loff_t *ppos) |
680 | { | |
f57de23a | 681 | struct blk_mq_ctx *ctx = data; |
4a46f05e OS |
682 | |
683 | ctx->rq_dispatched[0] = ctx->rq_dispatched[1] = 0; | |
684 | return count; | |
685 | } | |
686 | ||
f57de23a | 687 | static int ctx_merged_show(void *data, struct seq_file *m) |
4a46f05e | 688 | { |
f57de23a | 689 | struct blk_mq_ctx *ctx = data; |
4a46f05e OS |
690 | |
691 | seq_printf(m, "%lu\n", ctx->rq_merged); | |
692 | return 0; | |
693 | } | |
694 | ||
f57de23a OS |
695 | static ssize_t ctx_merged_write(void *data, const char __user *buf, |
696 | size_t count, loff_t *ppos) | |
4a46f05e | 697 | { |
f57de23a | 698 | struct blk_mq_ctx *ctx = data; |
4a46f05e OS |
699 | |
700 | ctx->rq_merged = 0; | |
701 | return count; | |
702 | } | |
703 | ||
f57de23a | 704 | static int ctx_completed_show(void *data, struct seq_file *m) |
4a46f05e | 705 | { |
f57de23a | 706 | struct blk_mq_ctx *ctx = data; |
4a46f05e OS |
707 | |
708 | seq_printf(m, "%lu %lu\n", ctx->rq_completed[1], ctx->rq_completed[0]); | |
709 | return 0; | |
710 | } | |
711 | ||
f57de23a OS |
712 | static ssize_t ctx_completed_write(void *data, const char __user *buf, |
713 | size_t count, loff_t *ppos) | |
4a46f05e | 714 | { |
f57de23a OS |
715 | struct blk_mq_ctx *ctx = data; |
716 | ||
717 | ctx->rq_completed[0] = ctx->rq_completed[1] = 0; | |
718 | return count; | |
4a46f05e OS |
719 | } |
720 | ||
f57de23a OS |
721 | static int blk_mq_debugfs_show(struct seq_file *m, void *v) |
722 | { | |
723 | const struct blk_mq_debugfs_attr *attr = m->private; | |
724 | void *data = d_inode(m->file->f_path.dentry->d_parent)->i_private; | |
725 | ||
726 | return attr->show(data, m); | |
727 | } | |
728 | ||
729 | static ssize_t blk_mq_debugfs_write(struct file *file, const char __user *buf, | |
730 | size_t count, loff_t *ppos) | |
4a46f05e OS |
731 | { |
732 | struct seq_file *m = file->private_data; | |
f57de23a OS |
733 | const struct blk_mq_debugfs_attr *attr = m->private; |
734 | void *data = d_inode(file->f_path.dentry->d_parent)->i_private; | |
4a46f05e | 735 | |
6b136a24 EG |
736 | /* |
737 | * Attributes that only implement .seq_ops are read-only and 'attr' is | |
738 | * the same with 'data' in this case. | |
739 | */ | |
740 | if (attr == data || !attr->write) | |
f57de23a OS |
741 | return -EPERM; |
742 | ||
743 | return attr->write(data, buf, count, ppos); | |
744 | } | |
745 | ||
746 | static int blk_mq_debugfs_open(struct inode *inode, struct file *file) | |
747 | { | |
748 | const struct blk_mq_debugfs_attr *attr = inode->i_private; | |
749 | void *data = d_inode(file->f_path.dentry->d_parent)->i_private; | |
750 | struct seq_file *m; | |
751 | int ret; | |
752 | ||
753 | if (attr->seq_ops) { | |
754 | ret = seq_open(file, attr->seq_ops); | |
755 | if (!ret) { | |
756 | m = file->private_data; | |
757 | m->private = data; | |
758 | } | |
759 | return ret; | |
760 | } | |
761 | ||
762 | if (WARN_ON_ONCE(!attr->show)) | |
763 | return -EPERM; | |
764 | ||
765 | return single_open(file, blk_mq_debugfs_show, inode->i_private); | |
4a46f05e OS |
766 | } |
767 | ||
f57de23a OS |
768 | static int blk_mq_debugfs_release(struct inode *inode, struct file *file) |
769 | { | |
770 | const struct blk_mq_debugfs_attr *attr = inode->i_private; | |
771 | ||
772 | if (attr->show) | |
773 | return single_release(inode, file); | |
774 | else | |
775 | return seq_release(inode, file); | |
776 | } | |
777 | ||
f8465933 | 778 | static const struct file_operations blk_mq_debugfs_fops = { |
f57de23a | 779 | .open = blk_mq_debugfs_open, |
4a46f05e | 780 | .read = seq_read, |
f57de23a | 781 | .write = blk_mq_debugfs_write, |
4a46f05e | 782 | .llseek = seq_lseek, |
f57de23a | 783 | .release = blk_mq_debugfs_release, |
4a46f05e OS |
784 | }; |
785 | ||
07e4fead | 786 | static const struct blk_mq_debugfs_attr blk_mq_debugfs_hctx_attrs[] = { |
f57de23a OS |
787 | {"state", 0400, hctx_state_show}, |
788 | {"flags", 0400, hctx_flags_show}, | |
789 | {"dispatch", 0400, .seq_ops = &hctx_dispatch_seq_ops}, | |
2720bab5 | 790 | {"busy", 0400, hctx_busy_show}, |
f57de23a OS |
791 | {"ctx_map", 0400, hctx_ctx_map_show}, |
792 | {"tags", 0400, hctx_tags_show}, | |
793 | {"tags_bitmap", 0400, hctx_tags_bitmap_show}, | |
794 | {"sched_tags", 0400, hctx_sched_tags_show}, | |
795 | {"sched_tags_bitmap", 0400, hctx_sched_tags_bitmap_show}, | |
796 | {"io_poll", 0600, hctx_io_poll_show, hctx_io_poll_write}, | |
797 | {"dispatched", 0600, hctx_dispatched_show, hctx_dispatched_write}, | |
798 | {"queued", 0600, hctx_queued_show, hctx_queued_write}, | |
799 | {"run", 0600, hctx_run_show, hctx_run_write}, | |
800 | {"active", 0400, hctx_active_show}, | |
6e768717 | 801 | {"dispatch_busy", 0400, hctx_dispatch_busy_show}, |
72f2f8f6 | 802 | {}, |
07e4fead OS |
803 | }; |
804 | ||
805 | static const struct blk_mq_debugfs_attr blk_mq_debugfs_ctx_attrs[] = { | |
f57de23a OS |
806 | {"rq_list", 0400, .seq_ops = &ctx_rq_list_seq_ops}, |
807 | {"dispatched", 0600, ctx_dispatched_show, ctx_dispatched_write}, | |
808 | {"merged", 0600, ctx_merged_show, ctx_merged_write}, | |
809 | {"completed", 0600, ctx_completed_show, ctx_completed_write}, | |
72f2f8f6 | 810 | {}, |
07e4fead OS |
811 | }; |
812 | ||
9c1051aa OS |
813 | static bool debugfs_create_files(struct dentry *parent, void *data, |
814 | const struct blk_mq_debugfs_attr *attr) | |
815 | { | |
816 | d_inode(parent)->i_private = data; | |
817 | ||
818 | for (; attr->name; attr++) { | |
819 | if (!debugfs_create_file(attr->name, attr->mode, parent, | |
820 | (void *)attr, &blk_mq_debugfs_fops)) | |
821 | return false; | |
822 | } | |
823 | return true; | |
824 | } | |
825 | ||
4c9e4019 | 826 | int blk_mq_debugfs_register(struct request_queue *q) |
07e4fead | 827 | { |
9c1051aa OS |
828 | struct blk_mq_hw_ctx *hctx; |
829 | int i; | |
830 | ||
18fbda91 | 831 | if (!blk_debugfs_root) |
07e4fead OS |
832 | return -ENOENT; |
833 | ||
4c9e4019 BVA |
834 | q->debugfs_dir = debugfs_create_dir(kobject_name(q->kobj.parent), |
835 | blk_debugfs_root); | |
07e4fead | 836 | if (!q->debugfs_dir) |
9c1051aa | 837 | return -ENOMEM; |
07e4fead | 838 | |
9c1051aa OS |
839 | if (!debugfs_create_files(q->debugfs_dir, q, |
840 | blk_mq_debugfs_queue_attrs)) | |
07e4fead OS |
841 | goto err; |
842 | ||
9c1051aa | 843 | /* |
70e62f4b | 844 | * blk_mq_init_sched() attempted to do this already, but q->debugfs_dir |
9c1051aa OS |
845 | * didn't exist yet (because we don't know what to name the directory |
846 | * until the queue is registered to a gendisk). | |
847 | */ | |
70e62f4b OS |
848 | if (q->elevator && !q->sched_debugfs_dir) |
849 | blk_mq_debugfs_register_sched(q); | |
850 | ||
851 | /* Similarly, blk_mq_init_hctx() couldn't do this previously. */ | |
9c1051aa OS |
852 | queue_for_each_hw_ctx(q, hctx, i) { |
853 | if (!hctx->debugfs_dir && blk_mq_debugfs_register_hctx(q, hctx)) | |
854 | goto err; | |
d332ce09 OS |
855 | if (q->elevator && !hctx->sched_debugfs_dir && |
856 | blk_mq_debugfs_register_sched_hctx(q, hctx)) | |
857 | goto err; | |
9c1051aa OS |
858 | } |
859 | ||
07e4fead OS |
860 | return 0; |
861 | ||
862 | err: | |
863 | blk_mq_debugfs_unregister(q); | |
864 | return -ENOMEM; | |
865 | } | |
866 | ||
867 | void blk_mq_debugfs_unregister(struct request_queue *q) | |
868 | { | |
869 | debugfs_remove_recursive(q->debugfs_dir); | |
d332ce09 | 870 | q->sched_debugfs_dir = NULL; |
07e4fead OS |
871 | q->debugfs_dir = NULL; |
872 | } | |
873 | ||
9c1051aa OS |
874 | static int blk_mq_debugfs_register_ctx(struct blk_mq_hw_ctx *hctx, |
875 | struct blk_mq_ctx *ctx) | |
07e4fead OS |
876 | { |
877 | struct dentry *ctx_dir; | |
878 | char name[20]; | |
07e4fead OS |
879 | |
880 | snprintf(name, sizeof(name), "cpu%u", ctx->cpu); | |
9c1051aa | 881 | ctx_dir = debugfs_create_dir(name, hctx->debugfs_dir); |
07e4fead OS |
882 | if (!ctx_dir) |
883 | return -ENOMEM; | |
884 | ||
72f2f8f6 BVA |
885 | if (!debugfs_create_files(ctx_dir, ctx, blk_mq_debugfs_ctx_attrs)) |
886 | return -ENOMEM; | |
07e4fead OS |
887 | |
888 | return 0; | |
889 | } | |
890 | ||
9c1051aa OS |
891 | int blk_mq_debugfs_register_hctx(struct request_queue *q, |
892 | struct blk_mq_hw_ctx *hctx) | |
07e4fead OS |
893 | { |
894 | struct blk_mq_ctx *ctx; | |
07e4fead OS |
895 | char name[20]; |
896 | int i; | |
897 | ||
9c1051aa OS |
898 | if (!q->debugfs_dir) |
899 | return -ENOENT; | |
900 | ||
88aabbd7 | 901 | snprintf(name, sizeof(name), "hctx%u", hctx->queue_num); |
9c1051aa OS |
902 | hctx->debugfs_dir = debugfs_create_dir(name, q->debugfs_dir); |
903 | if (!hctx->debugfs_dir) | |
07e4fead OS |
904 | return -ENOMEM; |
905 | ||
9c1051aa OS |
906 | if (!debugfs_create_files(hctx->debugfs_dir, hctx, |
907 | blk_mq_debugfs_hctx_attrs)) | |
908 | goto err; | |
07e4fead OS |
909 | |
910 | hctx_for_each_ctx(hctx, ctx, i) { | |
9c1051aa OS |
911 | if (blk_mq_debugfs_register_ctx(hctx, ctx)) |
912 | goto err; | |
07e4fead OS |
913 | } |
914 | ||
915 | return 0; | |
9c1051aa OS |
916 | |
917 | err: | |
918 | blk_mq_debugfs_unregister_hctx(hctx); | |
919 | return -ENOMEM; | |
920 | } | |
921 | ||
922 | void blk_mq_debugfs_unregister_hctx(struct blk_mq_hw_ctx *hctx) | |
923 | { | |
924 | debugfs_remove_recursive(hctx->debugfs_dir); | |
d332ce09 | 925 | hctx->sched_debugfs_dir = NULL; |
9c1051aa | 926 | hctx->debugfs_dir = NULL; |
07e4fead OS |
927 | } |
928 | ||
9c1051aa | 929 | int blk_mq_debugfs_register_hctxs(struct request_queue *q) |
07e4fead OS |
930 | { |
931 | struct blk_mq_hw_ctx *hctx; | |
932 | int i; | |
933 | ||
07e4fead OS |
934 | queue_for_each_hw_ctx(q, hctx, i) { |
935 | if (blk_mq_debugfs_register_hctx(q, hctx)) | |
9c1051aa | 936 | return -ENOMEM; |
07e4fead OS |
937 | } |
938 | ||
939 | return 0; | |
07e4fead OS |
940 | } |
941 | ||
9c1051aa | 942 | void blk_mq_debugfs_unregister_hctxs(struct request_queue *q) |
07e4fead | 943 | { |
9c1051aa OS |
944 | struct blk_mq_hw_ctx *hctx; |
945 | int i; | |
946 | ||
947 | queue_for_each_hw_ctx(q, hctx, i) | |
948 | blk_mq_debugfs_unregister_hctx(hctx); | |
07e4fead | 949 | } |
d332ce09 OS |
950 | |
951 | int blk_mq_debugfs_register_sched(struct request_queue *q) | |
952 | { | |
953 | struct elevator_type *e = q->elevator->type; | |
954 | ||
955 | if (!q->debugfs_dir) | |
956 | return -ENOENT; | |
957 | ||
958 | if (!e->queue_debugfs_attrs) | |
959 | return 0; | |
960 | ||
961 | q->sched_debugfs_dir = debugfs_create_dir("sched", q->debugfs_dir); | |
962 | if (!q->sched_debugfs_dir) | |
963 | return -ENOMEM; | |
964 | ||
965 | if (!debugfs_create_files(q->sched_debugfs_dir, q, | |
966 | e->queue_debugfs_attrs)) | |
967 | goto err; | |
968 | ||
969 | return 0; | |
970 | ||
971 | err: | |
972 | blk_mq_debugfs_unregister_sched(q); | |
973 | return -ENOMEM; | |
974 | } | |
975 | ||
976 | void blk_mq_debugfs_unregister_sched(struct request_queue *q) | |
977 | { | |
978 | debugfs_remove_recursive(q->sched_debugfs_dir); | |
979 | q->sched_debugfs_dir = NULL; | |
980 | } | |
981 | ||
982 | int blk_mq_debugfs_register_sched_hctx(struct request_queue *q, | |
983 | struct blk_mq_hw_ctx *hctx) | |
984 | { | |
985 | struct elevator_type *e = q->elevator->type; | |
986 | ||
987 | if (!hctx->debugfs_dir) | |
988 | return -ENOENT; | |
989 | ||
990 | if (!e->hctx_debugfs_attrs) | |
991 | return 0; | |
992 | ||
993 | hctx->sched_debugfs_dir = debugfs_create_dir("sched", | |
994 | hctx->debugfs_dir); | |
995 | if (!hctx->sched_debugfs_dir) | |
996 | return -ENOMEM; | |
997 | ||
998 | if (!debugfs_create_files(hctx->sched_debugfs_dir, hctx, | |
999 | e->hctx_debugfs_attrs)) | |
1000 | return -ENOMEM; | |
1001 | ||
1002 | return 0; | |
1003 | } | |
1004 | ||
1005 | void blk_mq_debugfs_unregister_sched_hctx(struct blk_mq_hw_ctx *hctx) | |
1006 | { | |
1007 | debugfs_remove_recursive(hctx->sched_debugfs_dir); | |
1008 | hctx->sched_debugfs_dir = NULL; | |
1009 | } |