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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" |
cc56694f | 26 | #include "blk-rq-qos.h" |
07e4fead | 27 | |
1209cb7f BVA |
28 | static void print_stat(struct seq_file *m, struct blk_rq_stat *stat) |
29 | { | |
30 | if (stat->nr_samples) { | |
31 | seq_printf(m, "samples=%d, mean=%lld, min=%llu, max=%llu", | |
32 | stat->nr_samples, stat->mean, stat->min, stat->max); | |
33 | } else { | |
34 | seq_puts(m, "samples=0"); | |
35 | } | |
36 | } | |
37 | ||
38 | static int queue_poll_stat_show(void *data, struct seq_file *m) | |
39 | { | |
40 | struct request_queue *q = data; | |
41 | int bucket; | |
42 | ||
43 | for (bucket = 0; bucket < BLK_MQ_POLL_STATS_BKTS/2; bucket++) { | |
44 | seq_printf(m, "read (%d Bytes): ", 1 << (9+bucket)); | |
45 | print_stat(m, &q->poll_stat[2*bucket]); | |
46 | seq_puts(m, "\n"); | |
47 | ||
48 | seq_printf(m, "write (%d Bytes): ", 1 << (9+bucket)); | |
49 | print_stat(m, &q->poll_stat[2*bucket+1]); | |
50 | seq_puts(m, "\n"); | |
51 | } | |
52 | return 0; | |
53 | } | |
54 | ||
55 | static void *queue_requeue_list_start(struct seq_file *m, loff_t *pos) | |
56 | __acquires(&q->requeue_lock) | |
57 | { | |
58 | struct request_queue *q = m->private; | |
59 | ||
60 | spin_lock_irq(&q->requeue_lock); | |
61 | return seq_list_start(&q->requeue_list, *pos); | |
62 | } | |
63 | ||
64 | static void *queue_requeue_list_next(struct seq_file *m, void *v, loff_t *pos) | |
65 | { | |
66 | struct request_queue *q = m->private; | |
67 | ||
68 | return seq_list_next(v, &q->requeue_list, pos); | |
69 | } | |
70 | ||
71 | static void queue_requeue_list_stop(struct seq_file *m, void *v) | |
72 | __releases(&q->requeue_lock) | |
73 | { | |
74 | struct request_queue *q = m->private; | |
75 | ||
76 | spin_unlock_irq(&q->requeue_lock); | |
77 | } | |
78 | ||
79 | static const struct seq_operations queue_requeue_list_seq_ops = { | |
80 | .start = queue_requeue_list_start, | |
81 | .next = queue_requeue_list_next, | |
82 | .stop = queue_requeue_list_stop, | |
83 | .show = blk_mq_debugfs_rq_show, | |
84 | }; | |
85 | ||
91d68905 BVA |
86 | static int blk_flags_show(struct seq_file *m, const unsigned long flags, |
87 | const char *const *flag_name, int flag_name_count) | |
88 | { | |
89 | bool sep = false; | |
90 | int i; | |
91 | ||
92 | for (i = 0; i < sizeof(flags) * BITS_PER_BYTE; i++) { | |
93 | if (!(flags & BIT(i))) | |
94 | continue; | |
95 | if (sep) | |
bec03d6b | 96 | seq_puts(m, "|"); |
91d68905 BVA |
97 | sep = true; |
98 | if (i < flag_name_count && flag_name[i]) | |
99 | seq_puts(m, flag_name[i]); | |
100 | else | |
101 | seq_printf(m, "%d", i); | |
102 | } | |
91d68905 BVA |
103 | return 0; |
104 | } | |
105 | ||
cd84a62e BVA |
106 | static int queue_pm_only_show(void *data, struct seq_file *m) |
107 | { | |
108 | struct request_queue *q = data; | |
109 | ||
110 | seq_printf(m, "%d\n", atomic_read(&q->pm_only)); | |
111 | return 0; | |
112 | } | |
113 | ||
1a435111 | 114 | #define QUEUE_FLAG_NAME(name) [QUEUE_FLAG_##name] = #name |
91d68905 | 115 | static const char *const blk_queue_flag_name[] = { |
1a435111 | 116 | QUEUE_FLAG_NAME(STOPPED), |
1a435111 | 117 | QUEUE_FLAG_NAME(DYING), |
1a435111 OS |
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), | |
22d53821 | 311 | CMD_FLAG_NAME(NOWAIT), |
1c26010c JW |
312 | CMD_FLAG_NAME(NOUNMAP), |
313 | CMD_FLAG_NAME(HIPRI), | |
8658dca8 | 314 | }; |
1a435111 | 315 | #undef CMD_FLAG_NAME |
8658dca8 | 316 | |
1a435111 | 317 | #define RQF_NAME(name) [ilog2((__force u32)RQF_##name)] = #name |
8658dca8 | 318 | static const char *const rqf_name[] = { |
1a435111 | 319 | RQF_NAME(SORTED), |
85ba3eff | 320 | RQF_NAME(STARTED), |
1a435111 OS |
321 | RQF_NAME(SOFTBARRIER), |
322 | RQF_NAME(FLUSH_SEQ), | |
323 | RQF_NAME(MIXED_MERGE), | |
324 | RQF_NAME(MQ_INFLIGHT), | |
325 | RQF_NAME(DONTPREP), | |
326 | RQF_NAME(PREEMPT), | |
327 | RQF_NAME(COPY_USER), | |
328 | RQF_NAME(FAILED), | |
329 | RQF_NAME(QUIET), | |
330 | RQF_NAME(ELVPRIV), | |
331 | RQF_NAME(IO_STAT), | |
332 | RQF_NAME(ALLOCED), | |
333 | RQF_NAME(PM), | |
334 | RQF_NAME(HASHED), | |
335 | RQF_NAME(STATS), | |
336 | RQF_NAME(SPECIAL_PAYLOAD), | |
5d75d3f2 | 337 | RQF_NAME(ZONE_WRITE_LOCKED), |
76a86f9d | 338 | RQF_NAME(MQ_POLL_SLEPT), |
8658dca8 | 339 | }; |
1a435111 | 340 | #undef RQF_NAME |
8658dca8 | 341 | |
ec6dcf63 BVA |
342 | static const char *const blk_mq_rq_state_name_array[] = { |
343 | [MQ_RQ_IDLE] = "idle", | |
344 | [MQ_RQ_IN_FLIGHT] = "in_flight", | |
345 | [MQ_RQ_COMPLETE] = "complete", | |
346 | }; | |
347 | ||
348 | static const char *blk_mq_rq_state_name(enum mq_rq_state rq_state) | |
349 | { | |
a1e79188 | 350 | if (WARN_ON_ONCE((unsigned int)rq_state >= |
ec6dcf63 BVA |
351 | ARRAY_SIZE(blk_mq_rq_state_name_array))) |
352 | return "(?)"; | |
353 | return blk_mq_rq_state_name_array[rq_state]; | |
354 | } | |
355 | ||
daaadb3e | 356 | int __blk_mq_debugfs_rq_show(struct seq_file *m, struct request *rq) |
950cd7e9 | 357 | { |
2836ee4b | 358 | const struct blk_mq_ops *const mq_ops = rq->q->mq_ops; |
8658dca8 | 359 | const unsigned int op = rq->cmd_flags & REQ_OP_MASK; |
950cd7e9 | 360 | |
8658dca8 BVA |
361 | seq_printf(m, "%p {.op=", rq); |
362 | if (op < ARRAY_SIZE(op_name) && op_name[op]) | |
363 | seq_printf(m, "%s", op_name[op]); | |
364 | else | |
365 | seq_printf(m, "%d", op); | |
366 | seq_puts(m, ", .cmd_flags="); | |
367 | blk_flags_show(m, rq->cmd_flags & ~REQ_OP_MASK, cmd_flag_name, | |
368 | ARRAY_SIZE(cmd_flag_name)); | |
369 | seq_puts(m, ", .rq_flags="); | |
370 | blk_flags_show(m, (__force unsigned int)rq->rq_flags, rqf_name, | |
371 | ARRAY_SIZE(rqf_name)); | |
ec6dcf63 | 372 | seq_printf(m, ", .state=%s", blk_mq_rq_state_name(blk_mq_rq_state(rq))); |
2836ee4b | 373 | seq_printf(m, ", .tag=%d, .internal_tag=%d", rq->tag, |
8658dca8 | 374 | rq->internal_tag); |
2836ee4b BVA |
375 | if (mq_ops->show_rq) |
376 | mq_ops->show_rq(m, rq); | |
377 | seq_puts(m, "}\n"); | |
950cd7e9 OS |
378 | return 0; |
379 | } | |
daaadb3e OS |
380 | EXPORT_SYMBOL_GPL(__blk_mq_debugfs_rq_show); |
381 | ||
382 | int blk_mq_debugfs_rq_show(struct seq_file *m, void *v) | |
383 | { | |
384 | return __blk_mq_debugfs_rq_show(m, list_entry_rq(v)); | |
385 | } | |
16b738f6 | 386 | EXPORT_SYMBOL_GPL(blk_mq_debugfs_rq_show); |
950cd7e9 OS |
387 | |
388 | static void *hctx_dispatch_start(struct seq_file *m, loff_t *pos) | |
f3bcb0e6 | 389 | __acquires(&hctx->lock) |
950cd7e9 OS |
390 | { |
391 | struct blk_mq_hw_ctx *hctx = m->private; | |
392 | ||
393 | spin_lock(&hctx->lock); | |
394 | return seq_list_start(&hctx->dispatch, *pos); | |
395 | } | |
396 | ||
397 | static void *hctx_dispatch_next(struct seq_file *m, void *v, loff_t *pos) | |
398 | { | |
399 | struct blk_mq_hw_ctx *hctx = m->private; | |
400 | ||
401 | return seq_list_next(v, &hctx->dispatch, pos); | |
402 | } | |
403 | ||
404 | static void hctx_dispatch_stop(struct seq_file *m, void *v) | |
f3bcb0e6 | 405 | __releases(&hctx->lock) |
950cd7e9 OS |
406 | { |
407 | struct blk_mq_hw_ctx *hctx = m->private; | |
408 | ||
409 | spin_unlock(&hctx->lock); | |
410 | } | |
411 | ||
412 | static const struct seq_operations hctx_dispatch_seq_ops = { | |
413 | .start = hctx_dispatch_start, | |
414 | .next = hctx_dispatch_next, | |
415 | .stop = hctx_dispatch_stop, | |
416 | .show = blk_mq_debugfs_rq_show, | |
417 | }; | |
418 | ||
2720bab5 BVA |
419 | struct show_busy_params { |
420 | struct seq_file *m; | |
421 | struct blk_mq_hw_ctx *hctx; | |
422 | }; | |
423 | ||
424 | /* | |
425 | * Note: the state of a request may change while this function is in progress, | |
7baa8572 JA |
426 | * e.g. due to a concurrent blk_mq_finish_request() call. Returns true to |
427 | * keep iterating requests. | |
2720bab5 | 428 | */ |
7baa8572 | 429 | static bool hctx_show_busy_rq(struct request *rq, void *data, bool reserved) |
2720bab5 BVA |
430 | { |
431 | const struct show_busy_params *params = data; | |
432 | ||
ea4f995e | 433 | if (rq->mq_hctx == params->hctx) |
2720bab5 BVA |
434 | __blk_mq_debugfs_rq_show(params->m, |
435 | list_entry_rq(&rq->queuelist)); | |
7baa8572 JA |
436 | |
437 | return true; | |
2720bab5 BVA |
438 | } |
439 | ||
440 | static int hctx_busy_show(void *data, struct seq_file *m) | |
441 | { | |
442 | struct blk_mq_hw_ctx *hctx = data; | |
443 | struct show_busy_params params = { .m = m, .hctx = hctx }; | |
444 | ||
445 | blk_mq_tagset_busy_iter(hctx->queue->tag_set, hctx_show_busy_rq, | |
446 | ¶ms); | |
447 | ||
448 | return 0; | |
449 | } | |
450 | ||
346fc108 ML |
451 | static const char *const hctx_types[] = { |
452 | [HCTX_TYPE_DEFAULT] = "default", | |
453 | [HCTX_TYPE_READ] = "read", | |
454 | [HCTX_TYPE_POLL] = "poll", | |
455 | }; | |
456 | ||
457 | static int hctx_type_show(void *data, struct seq_file *m) | |
458 | { | |
459 | struct blk_mq_hw_ctx *hctx = data; | |
460 | ||
461 | BUILD_BUG_ON(ARRAY_SIZE(hctx_types) != HCTX_MAX_TYPES); | |
462 | seq_printf(m, "%s\n", hctx_types[hctx->type]); | |
463 | return 0; | |
464 | } | |
465 | ||
f57de23a | 466 | static int hctx_ctx_map_show(void *data, struct seq_file *m) |
0bfa5288 | 467 | { |
f57de23a | 468 | struct blk_mq_hw_ctx *hctx = data; |
0bfa5288 OS |
469 | |
470 | sbitmap_bitmap_show(&hctx->ctx_map, m); | |
471 | return 0; | |
472 | } | |
473 | ||
d96b37c0 OS |
474 | static void blk_mq_debugfs_tags_show(struct seq_file *m, |
475 | struct blk_mq_tags *tags) | |
476 | { | |
477 | seq_printf(m, "nr_tags=%u\n", tags->nr_tags); | |
478 | seq_printf(m, "nr_reserved_tags=%u\n", tags->nr_reserved_tags); | |
479 | seq_printf(m, "active_queues=%d\n", | |
480 | atomic_read(&tags->active_queues)); | |
481 | ||
482 | seq_puts(m, "\nbitmap_tags:\n"); | |
483 | sbitmap_queue_show(&tags->bitmap_tags, m); | |
484 | ||
485 | if (tags->nr_reserved_tags) { | |
486 | seq_puts(m, "\nbreserved_tags:\n"); | |
487 | sbitmap_queue_show(&tags->breserved_tags, m); | |
488 | } | |
489 | } | |
490 | ||
f57de23a | 491 | static int hctx_tags_show(void *data, struct seq_file *m) |
d96b37c0 | 492 | { |
f57de23a | 493 | struct blk_mq_hw_ctx *hctx = data; |
d96b37c0 | 494 | struct request_queue *q = hctx->queue; |
8c0f14ea | 495 | int res; |
d96b37c0 | 496 | |
8c0f14ea BVA |
497 | res = mutex_lock_interruptible(&q->sysfs_lock); |
498 | if (res) | |
499 | goto out; | |
d96b37c0 OS |
500 | if (hctx->tags) |
501 | blk_mq_debugfs_tags_show(m, hctx->tags); | |
502 | mutex_unlock(&q->sysfs_lock); | |
503 | ||
8c0f14ea BVA |
504 | out: |
505 | return res; | |
d96b37c0 OS |
506 | } |
507 | ||
f57de23a | 508 | static int hctx_tags_bitmap_show(void *data, struct seq_file *m) |
d7e3621a | 509 | { |
f57de23a | 510 | struct blk_mq_hw_ctx *hctx = data; |
d7e3621a | 511 | struct request_queue *q = hctx->queue; |
8c0f14ea | 512 | int res; |
d7e3621a | 513 | |
8c0f14ea BVA |
514 | res = mutex_lock_interruptible(&q->sysfs_lock); |
515 | if (res) | |
516 | goto out; | |
d7e3621a OS |
517 | if (hctx->tags) |
518 | sbitmap_bitmap_show(&hctx->tags->bitmap_tags.sb, m); | |
519 | mutex_unlock(&q->sysfs_lock); | |
8c0f14ea BVA |
520 | |
521 | out: | |
522 | return res; | |
d7e3621a OS |
523 | } |
524 | ||
f57de23a | 525 | static int hctx_sched_tags_show(void *data, struct seq_file *m) |
d96b37c0 | 526 | { |
f57de23a | 527 | struct blk_mq_hw_ctx *hctx = data; |
d96b37c0 | 528 | struct request_queue *q = hctx->queue; |
8c0f14ea | 529 | int res; |
d96b37c0 | 530 | |
8c0f14ea BVA |
531 | res = mutex_lock_interruptible(&q->sysfs_lock); |
532 | if (res) | |
533 | goto out; | |
d96b37c0 OS |
534 | if (hctx->sched_tags) |
535 | blk_mq_debugfs_tags_show(m, hctx->sched_tags); | |
536 | mutex_unlock(&q->sysfs_lock); | |
537 | ||
8c0f14ea BVA |
538 | out: |
539 | return res; | |
d96b37c0 OS |
540 | } |
541 | ||
f57de23a | 542 | static int hctx_sched_tags_bitmap_show(void *data, struct seq_file *m) |
d7e3621a | 543 | { |
f57de23a | 544 | struct blk_mq_hw_ctx *hctx = data; |
d7e3621a | 545 | struct request_queue *q = hctx->queue; |
8c0f14ea | 546 | int res; |
d7e3621a | 547 | |
8c0f14ea BVA |
548 | res = mutex_lock_interruptible(&q->sysfs_lock); |
549 | if (res) | |
550 | goto out; | |
d7e3621a OS |
551 | if (hctx->sched_tags) |
552 | sbitmap_bitmap_show(&hctx->sched_tags->bitmap_tags.sb, m); | |
553 | mutex_unlock(&q->sysfs_lock); | |
8c0f14ea BVA |
554 | |
555 | out: | |
556 | return res; | |
d7e3621a OS |
557 | } |
558 | ||
f57de23a | 559 | static int hctx_io_poll_show(void *data, struct seq_file *m) |
be215473 | 560 | { |
f57de23a | 561 | struct blk_mq_hw_ctx *hctx = data; |
be215473 OS |
562 | |
563 | seq_printf(m, "considered=%lu\n", hctx->poll_considered); | |
564 | seq_printf(m, "invoked=%lu\n", hctx->poll_invoked); | |
565 | seq_printf(m, "success=%lu\n", hctx->poll_success); | |
566 | return 0; | |
567 | } | |
568 | ||
f57de23a | 569 | static ssize_t hctx_io_poll_write(void *data, const char __user *buf, |
be215473 OS |
570 | size_t count, loff_t *ppos) |
571 | { | |
f57de23a | 572 | struct blk_mq_hw_ctx *hctx = data; |
be215473 OS |
573 | |
574 | hctx->poll_considered = hctx->poll_invoked = hctx->poll_success = 0; | |
575 | return count; | |
576 | } | |
577 | ||
f57de23a | 578 | static int hctx_dispatched_show(void *data, struct seq_file *m) |
be215473 | 579 | { |
f57de23a | 580 | struct blk_mq_hw_ctx *hctx = data; |
be215473 OS |
581 | int i; |
582 | ||
583 | seq_printf(m, "%8u\t%lu\n", 0U, hctx->dispatched[0]); | |
584 | ||
585 | for (i = 1; i < BLK_MQ_MAX_DISPATCH_ORDER - 1; i++) { | |
586 | unsigned int d = 1U << (i - 1); | |
587 | ||
588 | seq_printf(m, "%8u\t%lu\n", d, hctx->dispatched[i]); | |
589 | } | |
590 | ||
591 | seq_printf(m, "%8u+\t%lu\n", 1U << (i - 1), hctx->dispatched[i]); | |
592 | return 0; | |
593 | } | |
594 | ||
f57de23a | 595 | static ssize_t hctx_dispatched_write(void *data, const char __user *buf, |
be215473 OS |
596 | size_t count, loff_t *ppos) |
597 | { | |
f57de23a | 598 | struct blk_mq_hw_ctx *hctx = data; |
be215473 OS |
599 | int i; |
600 | ||
601 | for (i = 0; i < BLK_MQ_MAX_DISPATCH_ORDER; i++) | |
602 | hctx->dispatched[i] = 0; | |
603 | return count; | |
604 | } | |
605 | ||
f57de23a | 606 | static int hctx_queued_show(void *data, struct seq_file *m) |
4a46f05e | 607 | { |
f57de23a | 608 | struct blk_mq_hw_ctx *hctx = data; |
4a46f05e OS |
609 | |
610 | seq_printf(m, "%lu\n", hctx->queued); | |
611 | return 0; | |
612 | } | |
613 | ||
f57de23a | 614 | static ssize_t hctx_queued_write(void *data, const char __user *buf, |
4a46f05e OS |
615 | size_t count, loff_t *ppos) |
616 | { | |
f57de23a | 617 | struct blk_mq_hw_ctx *hctx = data; |
4a46f05e OS |
618 | |
619 | hctx->queued = 0; | |
620 | return count; | |
621 | } | |
622 | ||
f57de23a | 623 | static int hctx_run_show(void *data, struct seq_file *m) |
4a46f05e | 624 | { |
f57de23a | 625 | struct blk_mq_hw_ctx *hctx = data; |
4a46f05e OS |
626 | |
627 | seq_printf(m, "%lu\n", hctx->run); | |
628 | return 0; | |
629 | } | |
630 | ||
f57de23a OS |
631 | static ssize_t hctx_run_write(void *data, const char __user *buf, size_t count, |
632 | loff_t *ppos) | |
4a46f05e | 633 | { |
f57de23a | 634 | struct blk_mq_hw_ctx *hctx = data; |
4a46f05e OS |
635 | |
636 | hctx->run = 0; | |
637 | return count; | |
638 | } | |
639 | ||
f57de23a | 640 | static int hctx_active_show(void *data, struct seq_file *m) |
4a46f05e | 641 | { |
f57de23a | 642 | struct blk_mq_hw_ctx *hctx = data; |
4a46f05e OS |
643 | |
644 | seq_printf(m, "%d\n", atomic_read(&hctx->nr_active)); | |
645 | return 0; | |
646 | } | |
647 | ||
6e768717 ML |
648 | static int hctx_dispatch_busy_show(void *data, struct seq_file *m) |
649 | { | |
650 | struct blk_mq_hw_ctx *hctx = data; | |
651 | ||
652 | seq_printf(m, "%u\n", hctx->dispatch_busy); | |
653 | return 0; | |
654 | } | |
655 | ||
c16d6b5a ML |
656 | #define CTX_RQ_SEQ_OPS(name, type) \ |
657 | static void *ctx_##name##_rq_list_start(struct seq_file *m, loff_t *pos) \ | |
658 | __acquires(&ctx->lock) \ | |
659 | { \ | |
660 | struct blk_mq_ctx *ctx = m->private; \ | |
661 | \ | |
662 | spin_lock(&ctx->lock); \ | |
663 | return seq_list_start(&ctx->rq_lists[type], *pos); \ | |
664 | } \ | |
665 | \ | |
666 | static void *ctx_##name##_rq_list_next(struct seq_file *m, void *v, \ | |
667 | loff_t *pos) \ | |
668 | { \ | |
669 | struct blk_mq_ctx *ctx = m->private; \ | |
670 | \ | |
671 | return seq_list_next(v, &ctx->rq_lists[type], pos); \ | |
672 | } \ | |
673 | \ | |
674 | static void ctx_##name##_rq_list_stop(struct seq_file *m, void *v) \ | |
675 | __releases(&ctx->lock) \ | |
676 | { \ | |
677 | struct blk_mq_ctx *ctx = m->private; \ | |
678 | \ | |
679 | spin_unlock(&ctx->lock); \ | |
680 | } \ | |
681 | \ | |
682 | static const struct seq_operations ctx_##name##_rq_list_seq_ops = { \ | |
683 | .start = ctx_##name##_rq_list_start, \ | |
684 | .next = ctx_##name##_rq_list_next, \ | |
685 | .stop = ctx_##name##_rq_list_stop, \ | |
686 | .show = blk_mq_debugfs_rq_show, \ | |
687 | } | |
688 | ||
689 | CTX_RQ_SEQ_OPS(default, HCTX_TYPE_DEFAULT); | |
690 | CTX_RQ_SEQ_OPS(read, HCTX_TYPE_READ); | |
691 | CTX_RQ_SEQ_OPS(poll, HCTX_TYPE_POLL); | |
950cd7e9 | 692 | |
f57de23a | 693 | static int ctx_dispatched_show(void *data, struct seq_file *m) |
4a46f05e | 694 | { |
f57de23a | 695 | struct blk_mq_ctx *ctx = data; |
4a46f05e OS |
696 | |
697 | seq_printf(m, "%lu %lu\n", ctx->rq_dispatched[1], ctx->rq_dispatched[0]); | |
698 | return 0; | |
699 | } | |
700 | ||
f57de23a | 701 | static ssize_t ctx_dispatched_write(void *data, const char __user *buf, |
4a46f05e OS |
702 | size_t count, loff_t *ppos) |
703 | { | |
f57de23a | 704 | struct blk_mq_ctx *ctx = data; |
4a46f05e OS |
705 | |
706 | ctx->rq_dispatched[0] = ctx->rq_dispatched[1] = 0; | |
707 | return count; | |
708 | } | |
709 | ||
f57de23a | 710 | static int ctx_merged_show(void *data, struct seq_file *m) |
4a46f05e | 711 | { |
f57de23a | 712 | struct blk_mq_ctx *ctx = data; |
4a46f05e OS |
713 | |
714 | seq_printf(m, "%lu\n", ctx->rq_merged); | |
715 | return 0; | |
716 | } | |
717 | ||
f57de23a OS |
718 | static ssize_t ctx_merged_write(void *data, const char __user *buf, |
719 | size_t count, loff_t *ppos) | |
4a46f05e | 720 | { |
f57de23a | 721 | struct blk_mq_ctx *ctx = data; |
4a46f05e OS |
722 | |
723 | ctx->rq_merged = 0; | |
724 | return count; | |
725 | } | |
726 | ||
f57de23a | 727 | static int ctx_completed_show(void *data, struct seq_file *m) |
4a46f05e | 728 | { |
f57de23a | 729 | struct blk_mq_ctx *ctx = data; |
4a46f05e OS |
730 | |
731 | seq_printf(m, "%lu %lu\n", ctx->rq_completed[1], ctx->rq_completed[0]); | |
732 | return 0; | |
733 | } | |
734 | ||
f57de23a OS |
735 | static ssize_t ctx_completed_write(void *data, const char __user *buf, |
736 | size_t count, loff_t *ppos) | |
4a46f05e | 737 | { |
f57de23a OS |
738 | struct blk_mq_ctx *ctx = data; |
739 | ||
740 | ctx->rq_completed[0] = ctx->rq_completed[1] = 0; | |
741 | return count; | |
4a46f05e OS |
742 | } |
743 | ||
f57de23a OS |
744 | static int blk_mq_debugfs_show(struct seq_file *m, void *v) |
745 | { | |
746 | const struct blk_mq_debugfs_attr *attr = m->private; | |
747 | void *data = d_inode(m->file->f_path.dentry->d_parent)->i_private; | |
748 | ||
749 | return attr->show(data, m); | |
750 | } | |
751 | ||
752 | static ssize_t blk_mq_debugfs_write(struct file *file, const char __user *buf, | |
753 | size_t count, loff_t *ppos) | |
4a46f05e OS |
754 | { |
755 | struct seq_file *m = file->private_data; | |
f57de23a OS |
756 | const struct blk_mq_debugfs_attr *attr = m->private; |
757 | void *data = d_inode(file->f_path.dentry->d_parent)->i_private; | |
4a46f05e | 758 | |
6b136a24 EG |
759 | /* |
760 | * Attributes that only implement .seq_ops are read-only and 'attr' is | |
761 | * the same with 'data' in this case. | |
762 | */ | |
763 | if (attr == data || !attr->write) | |
f57de23a OS |
764 | return -EPERM; |
765 | ||
766 | return attr->write(data, buf, count, ppos); | |
767 | } | |
768 | ||
769 | static int blk_mq_debugfs_open(struct inode *inode, struct file *file) | |
770 | { | |
771 | const struct blk_mq_debugfs_attr *attr = inode->i_private; | |
772 | void *data = d_inode(file->f_path.dentry->d_parent)->i_private; | |
773 | struct seq_file *m; | |
774 | int ret; | |
775 | ||
776 | if (attr->seq_ops) { | |
777 | ret = seq_open(file, attr->seq_ops); | |
778 | if (!ret) { | |
779 | m = file->private_data; | |
780 | m->private = data; | |
781 | } | |
782 | return ret; | |
783 | } | |
784 | ||
785 | if (WARN_ON_ONCE(!attr->show)) | |
786 | return -EPERM; | |
787 | ||
788 | return single_open(file, blk_mq_debugfs_show, inode->i_private); | |
4a46f05e OS |
789 | } |
790 | ||
f57de23a OS |
791 | static int blk_mq_debugfs_release(struct inode *inode, struct file *file) |
792 | { | |
793 | const struct blk_mq_debugfs_attr *attr = inode->i_private; | |
794 | ||
795 | if (attr->show) | |
796 | return single_release(inode, file); | |
797 | else | |
798 | return seq_release(inode, file); | |
799 | } | |
800 | ||
f8465933 | 801 | static const struct file_operations blk_mq_debugfs_fops = { |
f57de23a | 802 | .open = blk_mq_debugfs_open, |
4a46f05e | 803 | .read = seq_read, |
f57de23a | 804 | .write = blk_mq_debugfs_write, |
4a46f05e | 805 | .llseek = seq_lseek, |
f57de23a | 806 | .release = blk_mq_debugfs_release, |
4a46f05e OS |
807 | }; |
808 | ||
07e4fead | 809 | static const struct blk_mq_debugfs_attr blk_mq_debugfs_hctx_attrs[] = { |
f57de23a OS |
810 | {"state", 0400, hctx_state_show}, |
811 | {"flags", 0400, hctx_flags_show}, | |
812 | {"dispatch", 0400, .seq_ops = &hctx_dispatch_seq_ops}, | |
2720bab5 | 813 | {"busy", 0400, hctx_busy_show}, |
f57de23a OS |
814 | {"ctx_map", 0400, hctx_ctx_map_show}, |
815 | {"tags", 0400, hctx_tags_show}, | |
816 | {"tags_bitmap", 0400, hctx_tags_bitmap_show}, | |
817 | {"sched_tags", 0400, hctx_sched_tags_show}, | |
818 | {"sched_tags_bitmap", 0400, hctx_sched_tags_bitmap_show}, | |
819 | {"io_poll", 0600, hctx_io_poll_show, hctx_io_poll_write}, | |
820 | {"dispatched", 0600, hctx_dispatched_show, hctx_dispatched_write}, | |
821 | {"queued", 0600, hctx_queued_show, hctx_queued_write}, | |
822 | {"run", 0600, hctx_run_show, hctx_run_write}, | |
823 | {"active", 0400, hctx_active_show}, | |
6e768717 | 824 | {"dispatch_busy", 0400, hctx_dispatch_busy_show}, |
346fc108 | 825 | {"type", 0400, hctx_type_show}, |
72f2f8f6 | 826 | {}, |
07e4fead OS |
827 | }; |
828 | ||
829 | static const struct blk_mq_debugfs_attr blk_mq_debugfs_ctx_attrs[] = { | |
c16d6b5a ML |
830 | {"default_rq_list", 0400, .seq_ops = &ctx_default_rq_list_seq_ops}, |
831 | {"read_rq_list", 0400, .seq_ops = &ctx_read_rq_list_seq_ops}, | |
832 | {"poll_rq_list", 0400, .seq_ops = &ctx_poll_rq_list_seq_ops}, | |
f57de23a OS |
833 | {"dispatched", 0600, ctx_dispatched_show, ctx_dispatched_write}, |
834 | {"merged", 0600, ctx_merged_show, ctx_merged_write}, | |
835 | {"completed", 0600, ctx_completed_show, ctx_completed_write}, | |
72f2f8f6 | 836 | {}, |
07e4fead OS |
837 | }; |
838 | ||
9c1051aa OS |
839 | static bool debugfs_create_files(struct dentry *parent, void *data, |
840 | const struct blk_mq_debugfs_attr *attr) | |
841 | { | |
36991ca6 GKH |
842 | if (IS_ERR_OR_NULL(parent)) |
843 | return false; | |
844 | ||
9c1051aa OS |
845 | d_inode(parent)->i_private = data; |
846 | ||
847 | for (; attr->name; attr++) { | |
848 | if (!debugfs_create_file(attr->name, attr->mode, parent, | |
849 | (void *)attr, &blk_mq_debugfs_fops)) | |
850 | return false; | |
851 | } | |
852 | return true; | |
853 | } | |
854 | ||
4c9e4019 | 855 | int blk_mq_debugfs_register(struct request_queue *q) |
07e4fead | 856 | { |
9c1051aa OS |
857 | struct blk_mq_hw_ctx *hctx; |
858 | int i; | |
859 | ||
18fbda91 | 860 | if (!blk_debugfs_root) |
07e4fead OS |
861 | return -ENOENT; |
862 | ||
4c9e4019 BVA |
863 | q->debugfs_dir = debugfs_create_dir(kobject_name(q->kobj.parent), |
864 | blk_debugfs_root); | |
07e4fead | 865 | if (!q->debugfs_dir) |
9c1051aa | 866 | return -ENOMEM; |
07e4fead | 867 | |
9c1051aa OS |
868 | if (!debugfs_create_files(q->debugfs_dir, q, |
869 | blk_mq_debugfs_queue_attrs)) | |
07e4fead OS |
870 | goto err; |
871 | ||
9c1051aa | 872 | /* |
70e62f4b | 873 | * blk_mq_init_sched() attempted to do this already, but q->debugfs_dir |
9c1051aa OS |
874 | * didn't exist yet (because we don't know what to name the directory |
875 | * until the queue is registered to a gendisk). | |
876 | */ | |
70e62f4b OS |
877 | if (q->elevator && !q->sched_debugfs_dir) |
878 | blk_mq_debugfs_register_sched(q); | |
879 | ||
880 | /* Similarly, blk_mq_init_hctx() couldn't do this previously. */ | |
9c1051aa OS |
881 | queue_for_each_hw_ctx(q, hctx, i) { |
882 | if (!hctx->debugfs_dir && blk_mq_debugfs_register_hctx(q, hctx)) | |
883 | goto err; | |
d332ce09 OS |
884 | if (q->elevator && !hctx->sched_debugfs_dir && |
885 | blk_mq_debugfs_register_sched_hctx(q, hctx)) | |
886 | goto err; | |
9c1051aa OS |
887 | } |
888 | ||
cc56694f ML |
889 | if (q->rq_qos) { |
890 | struct rq_qos *rqos = q->rq_qos; | |
891 | ||
892 | while (rqos) { | |
893 | blk_mq_debugfs_register_rqos(rqos); | |
894 | rqos = rqos->next; | |
895 | } | |
896 | } | |
897 | ||
07e4fead OS |
898 | return 0; |
899 | ||
900 | err: | |
901 | blk_mq_debugfs_unregister(q); | |
902 | return -ENOMEM; | |
903 | } | |
904 | ||
905 | void blk_mq_debugfs_unregister(struct request_queue *q) | |
906 | { | |
907 | debugfs_remove_recursive(q->debugfs_dir); | |
d332ce09 | 908 | q->sched_debugfs_dir = NULL; |
07e4fead OS |
909 | q->debugfs_dir = NULL; |
910 | } | |
911 | ||
9c1051aa OS |
912 | static int blk_mq_debugfs_register_ctx(struct blk_mq_hw_ctx *hctx, |
913 | struct blk_mq_ctx *ctx) | |
07e4fead OS |
914 | { |
915 | struct dentry *ctx_dir; | |
916 | char name[20]; | |
07e4fead OS |
917 | |
918 | snprintf(name, sizeof(name), "cpu%u", ctx->cpu); | |
9c1051aa | 919 | ctx_dir = debugfs_create_dir(name, hctx->debugfs_dir); |
07e4fead OS |
920 | if (!ctx_dir) |
921 | return -ENOMEM; | |
922 | ||
72f2f8f6 BVA |
923 | if (!debugfs_create_files(ctx_dir, ctx, blk_mq_debugfs_ctx_attrs)) |
924 | return -ENOMEM; | |
07e4fead OS |
925 | |
926 | return 0; | |
927 | } | |
928 | ||
9c1051aa OS |
929 | int blk_mq_debugfs_register_hctx(struct request_queue *q, |
930 | struct blk_mq_hw_ctx *hctx) | |
07e4fead OS |
931 | { |
932 | struct blk_mq_ctx *ctx; | |
07e4fead OS |
933 | char name[20]; |
934 | int i; | |
935 | ||
9c1051aa OS |
936 | if (!q->debugfs_dir) |
937 | return -ENOENT; | |
938 | ||
88aabbd7 | 939 | snprintf(name, sizeof(name), "hctx%u", hctx->queue_num); |
9c1051aa OS |
940 | hctx->debugfs_dir = debugfs_create_dir(name, q->debugfs_dir); |
941 | if (!hctx->debugfs_dir) | |
07e4fead OS |
942 | return -ENOMEM; |
943 | ||
9c1051aa OS |
944 | if (!debugfs_create_files(hctx->debugfs_dir, hctx, |
945 | blk_mq_debugfs_hctx_attrs)) | |
946 | goto err; | |
07e4fead OS |
947 | |
948 | hctx_for_each_ctx(hctx, ctx, i) { | |
9c1051aa OS |
949 | if (blk_mq_debugfs_register_ctx(hctx, ctx)) |
950 | goto err; | |
07e4fead OS |
951 | } |
952 | ||
953 | return 0; | |
9c1051aa OS |
954 | |
955 | err: | |
956 | blk_mq_debugfs_unregister_hctx(hctx); | |
957 | return -ENOMEM; | |
958 | } | |
959 | ||
960 | void blk_mq_debugfs_unregister_hctx(struct blk_mq_hw_ctx *hctx) | |
961 | { | |
962 | debugfs_remove_recursive(hctx->debugfs_dir); | |
d332ce09 | 963 | hctx->sched_debugfs_dir = NULL; |
9c1051aa | 964 | hctx->debugfs_dir = NULL; |
07e4fead OS |
965 | } |
966 | ||
9c1051aa | 967 | int blk_mq_debugfs_register_hctxs(struct request_queue *q) |
07e4fead OS |
968 | { |
969 | struct blk_mq_hw_ctx *hctx; | |
970 | int i; | |
971 | ||
07e4fead OS |
972 | queue_for_each_hw_ctx(q, hctx, i) { |
973 | if (blk_mq_debugfs_register_hctx(q, hctx)) | |
9c1051aa | 974 | return -ENOMEM; |
07e4fead OS |
975 | } |
976 | ||
977 | return 0; | |
07e4fead OS |
978 | } |
979 | ||
9c1051aa | 980 | void blk_mq_debugfs_unregister_hctxs(struct request_queue *q) |
07e4fead | 981 | { |
9c1051aa OS |
982 | struct blk_mq_hw_ctx *hctx; |
983 | int i; | |
984 | ||
985 | queue_for_each_hw_ctx(q, hctx, i) | |
986 | blk_mq_debugfs_unregister_hctx(hctx); | |
07e4fead | 987 | } |
d332ce09 OS |
988 | |
989 | int blk_mq_debugfs_register_sched(struct request_queue *q) | |
990 | { | |
991 | struct elevator_type *e = q->elevator->type; | |
992 | ||
993 | if (!q->debugfs_dir) | |
994 | return -ENOENT; | |
995 | ||
996 | if (!e->queue_debugfs_attrs) | |
997 | return 0; | |
998 | ||
999 | q->sched_debugfs_dir = debugfs_create_dir("sched", q->debugfs_dir); | |
1000 | if (!q->sched_debugfs_dir) | |
1001 | return -ENOMEM; | |
1002 | ||
1003 | if (!debugfs_create_files(q->sched_debugfs_dir, q, | |
1004 | e->queue_debugfs_attrs)) | |
1005 | goto err; | |
1006 | ||
1007 | return 0; | |
1008 | ||
1009 | err: | |
1010 | blk_mq_debugfs_unregister_sched(q); | |
1011 | return -ENOMEM; | |
1012 | } | |
1013 | ||
1014 | void blk_mq_debugfs_unregister_sched(struct request_queue *q) | |
1015 | { | |
1016 | debugfs_remove_recursive(q->sched_debugfs_dir); | |
1017 | q->sched_debugfs_dir = NULL; | |
1018 | } | |
1019 | ||
cc56694f ML |
1020 | void blk_mq_debugfs_unregister_rqos(struct rq_qos *rqos) |
1021 | { | |
1022 | debugfs_remove_recursive(rqos->debugfs_dir); | |
1023 | rqos->debugfs_dir = NULL; | |
1024 | } | |
1025 | ||
1026 | int blk_mq_debugfs_register_rqos(struct rq_qos *rqos) | |
1027 | { | |
1028 | struct request_queue *q = rqos->q; | |
1029 | const char *dir_name = rq_qos_id_to_name(rqos->id); | |
1030 | ||
1031 | if (!q->debugfs_dir) | |
1032 | return -ENOENT; | |
1033 | ||
1034 | if (rqos->debugfs_dir || !rqos->ops->debugfs_attrs) | |
1035 | return 0; | |
1036 | ||
1037 | if (!q->rqos_debugfs_dir) { | |
1038 | q->rqos_debugfs_dir = debugfs_create_dir("rqos", | |
1039 | q->debugfs_dir); | |
1040 | if (!q->rqos_debugfs_dir) | |
1041 | return -ENOMEM; | |
1042 | } | |
1043 | ||
1044 | rqos->debugfs_dir = debugfs_create_dir(dir_name, | |
1045 | rqos->q->rqos_debugfs_dir); | |
1046 | if (!rqos->debugfs_dir) | |
1047 | return -ENOMEM; | |
1048 | ||
1049 | if (!debugfs_create_files(rqos->debugfs_dir, rqos, | |
1050 | rqos->ops->debugfs_attrs)) | |
1051 | goto err; | |
1052 | return 0; | |
1053 | err: | |
1054 | blk_mq_debugfs_unregister_rqos(rqos); | |
1055 | return -ENOMEM; | |
1056 | } | |
1057 | ||
1058 | void blk_mq_debugfs_unregister_queue_rqos(struct request_queue *q) | |
1059 | { | |
1060 | debugfs_remove_recursive(q->rqos_debugfs_dir); | |
1061 | q->rqos_debugfs_dir = NULL; | |
1062 | } | |
1063 | ||
d332ce09 OS |
1064 | int blk_mq_debugfs_register_sched_hctx(struct request_queue *q, |
1065 | struct blk_mq_hw_ctx *hctx) | |
1066 | { | |
1067 | struct elevator_type *e = q->elevator->type; | |
1068 | ||
1069 | if (!hctx->debugfs_dir) | |
1070 | return -ENOENT; | |
1071 | ||
1072 | if (!e->hctx_debugfs_attrs) | |
1073 | return 0; | |
1074 | ||
1075 | hctx->sched_debugfs_dir = debugfs_create_dir("sched", | |
1076 | hctx->debugfs_dir); | |
1077 | if (!hctx->sched_debugfs_dir) | |
1078 | return -ENOMEM; | |
1079 | ||
1080 | if (!debugfs_create_files(hctx->sched_debugfs_dir, hctx, | |
1081 | e->hctx_debugfs_attrs)) | |
1082 | return -ENOMEM; | |
1083 | ||
1084 | return 0; | |
1085 | } | |
1086 | ||
1087 | void blk_mq_debugfs_unregister_sched_hctx(struct blk_mq_hw_ctx *hctx) | |
1088 | { | |
1089 | debugfs_remove_recursive(hctx->sched_debugfs_dir); | |
1090 | hctx->sched_debugfs_dir = NULL; | |
1091 | } |