Commit | Line | Data |
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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 | |
91d68905 BVA |
27 | static int blk_flags_show(struct seq_file *m, const unsigned long flags, |
28 | const char *const *flag_name, int flag_name_count) | |
29 | { | |
30 | bool sep = false; | |
31 | int i; | |
32 | ||
33 | for (i = 0; i < sizeof(flags) * BITS_PER_BYTE; i++) { | |
34 | if (!(flags & BIT(i))) | |
35 | continue; | |
36 | if (sep) | |
bec03d6b | 37 | seq_puts(m, "|"); |
91d68905 BVA |
38 | sep = true; |
39 | if (i < flag_name_count && flag_name[i]) | |
40 | seq_puts(m, flag_name[i]); | |
41 | else | |
42 | seq_printf(m, "%d", i); | |
43 | } | |
91d68905 BVA |
44 | return 0; |
45 | } | |
46 | ||
1a435111 | 47 | #define QUEUE_FLAG_NAME(name) [QUEUE_FLAG_##name] = #name |
91d68905 | 48 | static const char *const blk_queue_flag_name[] = { |
1a435111 OS |
49 | QUEUE_FLAG_NAME(QUEUED), |
50 | QUEUE_FLAG_NAME(STOPPED), | |
51 | QUEUE_FLAG_NAME(SYNCFULL), | |
52 | QUEUE_FLAG_NAME(ASYNCFULL), | |
53 | QUEUE_FLAG_NAME(DYING), | |
54 | QUEUE_FLAG_NAME(BYPASS), | |
55 | QUEUE_FLAG_NAME(BIDI), | |
56 | QUEUE_FLAG_NAME(NOMERGES), | |
57 | QUEUE_FLAG_NAME(SAME_COMP), | |
58 | QUEUE_FLAG_NAME(FAIL_IO), | |
59 | QUEUE_FLAG_NAME(STACKABLE), | |
60 | QUEUE_FLAG_NAME(NONROT), | |
61 | QUEUE_FLAG_NAME(IO_STAT), | |
62 | QUEUE_FLAG_NAME(DISCARD), | |
63 | QUEUE_FLAG_NAME(NOXMERGES), | |
64 | QUEUE_FLAG_NAME(ADD_RANDOM), | |
65 | QUEUE_FLAG_NAME(SECERASE), | |
66 | QUEUE_FLAG_NAME(SAME_FORCE), | |
67 | QUEUE_FLAG_NAME(DEAD), | |
68 | QUEUE_FLAG_NAME(INIT_DONE), | |
69 | QUEUE_FLAG_NAME(NO_SG_MERGE), | |
70 | QUEUE_FLAG_NAME(POLL), | |
71 | QUEUE_FLAG_NAME(WC), | |
72 | QUEUE_FLAG_NAME(FUA), | |
73 | QUEUE_FLAG_NAME(FLUSH_NQ), | |
74 | QUEUE_FLAG_NAME(DAX), | |
75 | QUEUE_FLAG_NAME(STATS), | |
76 | QUEUE_FLAG_NAME(POLL_STATS), | |
77 | QUEUE_FLAG_NAME(REGISTERED), | |
91d68905 | 78 | }; |
1a435111 | 79 | #undef QUEUE_FLAG_NAME |
91d68905 | 80 | |
f57de23a | 81 | static int queue_state_show(void *data, struct seq_file *m) |
91d68905 | 82 | { |
f57de23a | 83 | struct request_queue *q = data; |
91d68905 BVA |
84 | |
85 | blk_flags_show(m, q->queue_flags, blk_queue_flag_name, | |
86 | ARRAY_SIZE(blk_queue_flag_name)); | |
fd07dc81 | 87 | seq_puts(m, "\n"); |
91d68905 BVA |
88 | return 0; |
89 | } | |
90 | ||
f57de23a OS |
91 | static ssize_t queue_state_write(void *data, const char __user *buf, |
92 | size_t count, loff_t *ppos) | |
91d68905 | 93 | { |
f57de23a | 94 | struct request_queue *q = data; |
71b90511 | 95 | char opbuf[16] = { }, *op; |
91d68905 | 96 | |
18d4d7d0 BVA |
97 | /* |
98 | * The "state" attribute is removed after blk_cleanup_queue() has called | |
99 | * blk_mq_free_queue(). Return if QUEUE_FLAG_DEAD has been set to avoid | |
100 | * triggering a use-after-free. | |
101 | */ | |
102 | if (blk_queue_dead(q)) | |
103 | return -ENOENT; | |
104 | ||
71b90511 | 105 | if (count >= sizeof(opbuf)) { |
c7e4145a OS |
106 | pr_err("%s: operation too long\n", __func__); |
107 | goto inval; | |
108 | } | |
109 | ||
71b90511 | 110 | if (copy_from_user(opbuf, buf, count)) |
91d68905 | 111 | return -EFAULT; |
71b90511 | 112 | op = strstrip(opbuf); |
91d68905 BVA |
113 | if (strcmp(op, "run") == 0) { |
114 | blk_mq_run_hw_queues(q, true); | |
115 | } else if (strcmp(op, "start") == 0) { | |
116 | blk_mq_start_stopped_hw_queues(q, true); | |
edea55ab BVA |
117 | } else if (strcmp(op, "kick") == 0) { |
118 | blk_mq_kick_requeue_list(q); | |
91d68905 | 119 | } else { |
c7e4145a OS |
120 | pr_err("%s: unsupported operation '%s'\n", __func__, op); |
121 | inval: | |
edea55ab | 122 | pr_err("%s: use 'run', 'start' or 'kick'\n", __func__); |
91d68905 BVA |
123 | return -EINVAL; |
124 | } | |
c7e4145a | 125 | return count; |
91d68905 BVA |
126 | } |
127 | ||
34dbad5d OS |
128 | static void print_stat(struct seq_file *m, struct blk_rq_stat *stat) |
129 | { | |
130 | if (stat->nr_samples) { | |
131 | seq_printf(m, "samples=%d, mean=%lld, min=%llu, max=%llu", | |
132 | stat->nr_samples, stat->mean, stat->min, stat->max); | |
133 | } else { | |
134 | seq_puts(m, "samples=0"); | |
135 | } | |
136 | } | |
137 | ||
f57de23a | 138 | static int queue_poll_stat_show(void *data, struct seq_file *m) |
34dbad5d | 139 | { |
f57de23a | 140 | struct request_queue *q = data; |
0206319f | 141 | int bucket; |
34dbad5d | 142 | |
0206319f SB |
143 | for (bucket = 0; bucket < BLK_MQ_POLL_STATS_BKTS/2; bucket++) { |
144 | seq_printf(m, "read (%d Bytes): ", 1 << (9+bucket)); | |
145 | print_stat(m, &q->poll_stat[2*bucket]); | |
146 | seq_puts(m, "\n"); | |
34dbad5d | 147 | |
0206319f SB |
148 | seq_printf(m, "write (%d Bytes): ", 1 << (9+bucket)); |
149 | print_stat(m, &q->poll_stat[2*bucket+1]); | |
150 | seq_puts(m, "\n"); | |
151 | } | |
34dbad5d OS |
152 | return 0; |
153 | } | |
154 | ||
1a435111 | 155 | #define HCTX_STATE_NAME(name) [BLK_MQ_S_##name] = #name |
f5c0b091 | 156 | static const char *const hctx_state_name[] = { |
1a435111 OS |
157 | HCTX_STATE_NAME(STOPPED), |
158 | HCTX_STATE_NAME(TAG_ACTIVE), | |
159 | HCTX_STATE_NAME(SCHED_RESTART), | |
160 | HCTX_STATE_NAME(TAG_WAITING), | |
161 | HCTX_STATE_NAME(START_ON_RUN), | |
f5c0b091 | 162 | }; |
1a435111 OS |
163 | #undef HCTX_STATE_NAME |
164 | ||
f57de23a | 165 | static int hctx_state_show(void *data, struct seq_file *m) |
9abb2ad2 | 166 | { |
f57de23a | 167 | struct blk_mq_hw_ctx *hctx = data; |
9abb2ad2 | 168 | |
f5c0b091 BVA |
169 | blk_flags_show(m, hctx->state, hctx_state_name, |
170 | ARRAY_SIZE(hctx_state_name)); | |
fd07dc81 | 171 | seq_puts(m, "\n"); |
9abb2ad2 OS |
172 | return 0; |
173 | } | |
174 | ||
1a435111 | 175 | #define BLK_TAG_ALLOC_NAME(name) [BLK_TAG_ALLOC_##name] = #name |
f5c0b091 | 176 | static const char *const alloc_policy_name[] = { |
1a435111 OS |
177 | BLK_TAG_ALLOC_NAME(FIFO), |
178 | BLK_TAG_ALLOC_NAME(RR), | |
f5c0b091 | 179 | }; |
1a435111 | 180 | #undef BLK_TAG_ALLOC_NAME |
f5c0b091 | 181 | |
1a435111 | 182 | #define HCTX_FLAG_NAME(name) [ilog2(BLK_MQ_F_##name)] = #name |
f5c0b091 | 183 | static const char *const hctx_flag_name[] = { |
1a435111 OS |
184 | HCTX_FLAG_NAME(SHOULD_MERGE), |
185 | HCTX_FLAG_NAME(TAG_SHARED), | |
186 | HCTX_FLAG_NAME(SG_MERGE), | |
187 | HCTX_FLAG_NAME(BLOCKING), | |
188 | HCTX_FLAG_NAME(NO_SCHED), | |
f5c0b091 | 189 | }; |
1a435111 | 190 | #undef HCTX_FLAG_NAME |
f5c0b091 | 191 | |
f57de23a | 192 | static int hctx_flags_show(void *data, struct seq_file *m) |
9abb2ad2 | 193 | { |
f57de23a | 194 | struct blk_mq_hw_ctx *hctx = data; |
f5c0b091 | 195 | const int alloc_policy = BLK_MQ_FLAG_TO_ALLOC_POLICY(hctx->flags); |
9abb2ad2 | 196 | |
f5c0b091 BVA |
197 | seq_puts(m, "alloc_policy="); |
198 | if (alloc_policy < ARRAY_SIZE(alloc_policy_name) && | |
199 | alloc_policy_name[alloc_policy]) | |
200 | seq_puts(m, alloc_policy_name[alloc_policy]); | |
201 | else | |
202 | seq_printf(m, "%d", alloc_policy); | |
203 | seq_puts(m, " "); | |
204 | blk_flags_show(m, | |
205 | hctx->flags ^ BLK_ALLOC_POLICY_TO_MQ_FLAG(alloc_policy), | |
206 | hctx_flag_name, ARRAY_SIZE(hctx_flag_name)); | |
fd07dc81 | 207 | seq_puts(m, "\n"); |
9abb2ad2 OS |
208 | return 0; |
209 | } | |
210 | ||
1a435111 | 211 | #define REQ_OP_NAME(name) [REQ_OP_##name] = #name |
8658dca8 | 212 | static const char *const op_name[] = { |
1a435111 OS |
213 | REQ_OP_NAME(READ), |
214 | REQ_OP_NAME(WRITE), | |
215 | REQ_OP_NAME(FLUSH), | |
216 | REQ_OP_NAME(DISCARD), | |
217 | REQ_OP_NAME(ZONE_REPORT), | |
218 | REQ_OP_NAME(SECURE_ERASE), | |
219 | REQ_OP_NAME(ZONE_RESET), | |
220 | REQ_OP_NAME(WRITE_SAME), | |
221 | REQ_OP_NAME(WRITE_ZEROES), | |
222 | REQ_OP_NAME(SCSI_IN), | |
223 | REQ_OP_NAME(SCSI_OUT), | |
224 | REQ_OP_NAME(DRV_IN), | |
225 | REQ_OP_NAME(DRV_OUT), | |
8658dca8 | 226 | }; |
1a435111 | 227 | #undef REQ_OP_NAME |
8658dca8 | 228 | |
1a435111 | 229 | #define CMD_FLAG_NAME(name) [__REQ_##name] = #name |
8658dca8 | 230 | static const char *const cmd_flag_name[] = { |
1a435111 OS |
231 | CMD_FLAG_NAME(FAILFAST_DEV), |
232 | CMD_FLAG_NAME(FAILFAST_TRANSPORT), | |
233 | CMD_FLAG_NAME(FAILFAST_DRIVER), | |
234 | CMD_FLAG_NAME(SYNC), | |
235 | CMD_FLAG_NAME(META), | |
236 | CMD_FLAG_NAME(PRIO), | |
237 | CMD_FLAG_NAME(NOMERGE), | |
238 | CMD_FLAG_NAME(IDLE), | |
239 | CMD_FLAG_NAME(INTEGRITY), | |
240 | CMD_FLAG_NAME(FUA), | |
241 | CMD_FLAG_NAME(PREFLUSH), | |
242 | CMD_FLAG_NAME(RAHEAD), | |
243 | CMD_FLAG_NAME(BACKGROUND), | |
244 | CMD_FLAG_NAME(NOUNMAP), | |
8658dca8 | 245 | }; |
1a435111 | 246 | #undef CMD_FLAG_NAME |
8658dca8 | 247 | |
1a435111 | 248 | #define RQF_NAME(name) [ilog2((__force u32)RQF_##name)] = #name |
8658dca8 | 249 | static const char *const rqf_name[] = { |
1a435111 OS |
250 | RQF_NAME(SORTED), |
251 | RQF_NAME(STARTED), | |
252 | RQF_NAME(QUEUED), | |
253 | RQF_NAME(SOFTBARRIER), | |
254 | RQF_NAME(FLUSH_SEQ), | |
255 | RQF_NAME(MIXED_MERGE), | |
256 | RQF_NAME(MQ_INFLIGHT), | |
257 | RQF_NAME(DONTPREP), | |
258 | RQF_NAME(PREEMPT), | |
259 | RQF_NAME(COPY_USER), | |
260 | RQF_NAME(FAILED), | |
261 | RQF_NAME(QUIET), | |
262 | RQF_NAME(ELVPRIV), | |
263 | RQF_NAME(IO_STAT), | |
264 | RQF_NAME(ALLOCED), | |
265 | RQF_NAME(PM), | |
266 | RQF_NAME(HASHED), | |
267 | RQF_NAME(STATS), | |
268 | RQF_NAME(SPECIAL_PAYLOAD), | |
8658dca8 | 269 | }; |
1a435111 | 270 | #undef RQF_NAME |
8658dca8 | 271 | |
c0cb1c6d BVA |
272 | #define RQAF_NAME(name) [REQ_ATOM_##name] = #name |
273 | static const char *const rqaf_name[] = { | |
274 | RQAF_NAME(COMPLETE), | |
275 | RQAF_NAME(STARTED), | |
276 | RQAF_NAME(POLL_SLEPT), | |
277 | }; | |
278 | #undef RQAF_NAME | |
279 | ||
daaadb3e | 280 | int __blk_mq_debugfs_rq_show(struct seq_file *m, struct request *rq) |
950cd7e9 | 281 | { |
2836ee4b | 282 | const struct blk_mq_ops *const mq_ops = rq->q->mq_ops; |
8658dca8 | 283 | const unsigned int op = rq->cmd_flags & REQ_OP_MASK; |
950cd7e9 | 284 | |
8658dca8 BVA |
285 | seq_printf(m, "%p {.op=", rq); |
286 | if (op < ARRAY_SIZE(op_name) && op_name[op]) | |
287 | seq_printf(m, "%s", op_name[op]); | |
288 | else | |
289 | seq_printf(m, "%d", op); | |
290 | seq_puts(m, ", .cmd_flags="); | |
291 | blk_flags_show(m, rq->cmd_flags & ~REQ_OP_MASK, cmd_flag_name, | |
292 | ARRAY_SIZE(cmd_flag_name)); | |
293 | seq_puts(m, ", .rq_flags="); | |
294 | blk_flags_show(m, (__force unsigned int)rq->rq_flags, rqf_name, | |
295 | ARRAY_SIZE(rqf_name)); | |
c0cb1c6d BVA |
296 | seq_puts(m, ", .atomic_flags="); |
297 | blk_flags_show(m, rq->atomic_flags, rqaf_name, ARRAY_SIZE(rqaf_name)); | |
2836ee4b | 298 | seq_printf(m, ", .tag=%d, .internal_tag=%d", rq->tag, |
8658dca8 | 299 | rq->internal_tag); |
2836ee4b BVA |
300 | if (mq_ops->show_rq) |
301 | mq_ops->show_rq(m, rq); | |
302 | seq_puts(m, "}\n"); | |
950cd7e9 OS |
303 | return 0; |
304 | } | |
daaadb3e OS |
305 | EXPORT_SYMBOL_GPL(__blk_mq_debugfs_rq_show); |
306 | ||
307 | int blk_mq_debugfs_rq_show(struct seq_file *m, void *v) | |
308 | { | |
309 | return __blk_mq_debugfs_rq_show(m, list_entry_rq(v)); | |
310 | } | |
16b738f6 | 311 | EXPORT_SYMBOL_GPL(blk_mq_debugfs_rq_show); |
950cd7e9 | 312 | |
8ef1a191 BVA |
313 | static void *queue_requeue_list_start(struct seq_file *m, loff_t *pos) |
314 | __acquires(&q->requeue_lock) | |
315 | { | |
316 | struct request_queue *q = m->private; | |
317 | ||
318 | spin_lock_irq(&q->requeue_lock); | |
319 | return seq_list_start(&q->requeue_list, *pos); | |
320 | } | |
321 | ||
322 | static void *queue_requeue_list_next(struct seq_file *m, void *v, loff_t *pos) | |
323 | { | |
324 | struct request_queue *q = m->private; | |
325 | ||
326 | return seq_list_next(v, &q->requeue_list, pos); | |
327 | } | |
328 | ||
329 | static void queue_requeue_list_stop(struct seq_file *m, void *v) | |
330 | __releases(&q->requeue_lock) | |
331 | { | |
332 | struct request_queue *q = m->private; | |
333 | ||
334 | spin_unlock_irq(&q->requeue_lock); | |
335 | } | |
336 | ||
337 | static const struct seq_operations queue_requeue_list_seq_ops = { | |
338 | .start = queue_requeue_list_start, | |
339 | .next = queue_requeue_list_next, | |
340 | .stop = queue_requeue_list_stop, | |
341 | .show = blk_mq_debugfs_rq_show, | |
342 | }; | |
343 | ||
950cd7e9 | 344 | static void *hctx_dispatch_start(struct seq_file *m, loff_t *pos) |
f3bcb0e6 | 345 | __acquires(&hctx->lock) |
950cd7e9 OS |
346 | { |
347 | struct blk_mq_hw_ctx *hctx = m->private; | |
348 | ||
349 | spin_lock(&hctx->lock); | |
350 | return seq_list_start(&hctx->dispatch, *pos); | |
351 | } | |
352 | ||
353 | static void *hctx_dispatch_next(struct seq_file *m, void *v, loff_t *pos) | |
354 | { | |
355 | struct blk_mq_hw_ctx *hctx = m->private; | |
356 | ||
357 | return seq_list_next(v, &hctx->dispatch, pos); | |
358 | } | |
359 | ||
360 | static void hctx_dispatch_stop(struct seq_file *m, void *v) | |
f3bcb0e6 | 361 | __releases(&hctx->lock) |
950cd7e9 OS |
362 | { |
363 | struct blk_mq_hw_ctx *hctx = m->private; | |
364 | ||
365 | spin_unlock(&hctx->lock); | |
366 | } | |
367 | ||
368 | static const struct seq_operations hctx_dispatch_seq_ops = { | |
369 | .start = hctx_dispatch_start, | |
370 | .next = hctx_dispatch_next, | |
371 | .stop = hctx_dispatch_stop, | |
372 | .show = blk_mq_debugfs_rq_show, | |
373 | }; | |
374 | ||
2720bab5 BVA |
375 | struct show_busy_params { |
376 | struct seq_file *m; | |
377 | struct blk_mq_hw_ctx *hctx; | |
378 | }; | |
379 | ||
380 | /* | |
381 | * Note: the state of a request may change while this function is in progress, | |
382 | * e.g. due to a concurrent blk_mq_finish_request() call. | |
383 | */ | |
384 | static void hctx_show_busy_rq(struct request *rq, void *data, bool reserved) | |
385 | { | |
386 | const struct show_busy_params *params = data; | |
387 | ||
388 | if (blk_mq_map_queue(rq->q, rq->mq_ctx->cpu) == params->hctx && | |
389 | test_bit(REQ_ATOM_STARTED, &rq->atomic_flags)) | |
390 | __blk_mq_debugfs_rq_show(params->m, | |
391 | list_entry_rq(&rq->queuelist)); | |
392 | } | |
393 | ||
394 | static int hctx_busy_show(void *data, struct seq_file *m) | |
395 | { | |
396 | struct blk_mq_hw_ctx *hctx = data; | |
397 | struct show_busy_params params = { .m = m, .hctx = hctx }; | |
398 | ||
399 | blk_mq_tagset_busy_iter(hctx->queue->tag_set, hctx_show_busy_rq, | |
400 | ¶ms); | |
401 | ||
402 | return 0; | |
403 | } | |
404 | ||
f57de23a | 405 | static int hctx_ctx_map_show(void *data, struct seq_file *m) |
0bfa5288 | 406 | { |
f57de23a | 407 | struct blk_mq_hw_ctx *hctx = data; |
0bfa5288 OS |
408 | |
409 | sbitmap_bitmap_show(&hctx->ctx_map, m); | |
410 | return 0; | |
411 | } | |
412 | ||
d96b37c0 OS |
413 | static void blk_mq_debugfs_tags_show(struct seq_file *m, |
414 | struct blk_mq_tags *tags) | |
415 | { | |
416 | seq_printf(m, "nr_tags=%u\n", tags->nr_tags); | |
417 | seq_printf(m, "nr_reserved_tags=%u\n", tags->nr_reserved_tags); | |
418 | seq_printf(m, "active_queues=%d\n", | |
419 | atomic_read(&tags->active_queues)); | |
420 | ||
421 | seq_puts(m, "\nbitmap_tags:\n"); | |
422 | sbitmap_queue_show(&tags->bitmap_tags, m); | |
423 | ||
424 | if (tags->nr_reserved_tags) { | |
425 | seq_puts(m, "\nbreserved_tags:\n"); | |
426 | sbitmap_queue_show(&tags->breserved_tags, m); | |
427 | } | |
428 | } | |
429 | ||
f57de23a | 430 | static int hctx_tags_show(void *data, struct seq_file *m) |
d96b37c0 | 431 | { |
f57de23a | 432 | struct blk_mq_hw_ctx *hctx = data; |
d96b37c0 | 433 | struct request_queue *q = hctx->queue; |
8c0f14ea | 434 | int res; |
d96b37c0 | 435 | |
8c0f14ea BVA |
436 | res = mutex_lock_interruptible(&q->sysfs_lock); |
437 | if (res) | |
438 | goto out; | |
d96b37c0 OS |
439 | if (hctx->tags) |
440 | blk_mq_debugfs_tags_show(m, hctx->tags); | |
441 | mutex_unlock(&q->sysfs_lock); | |
442 | ||
8c0f14ea BVA |
443 | out: |
444 | return res; | |
d96b37c0 OS |
445 | } |
446 | ||
f57de23a | 447 | static int hctx_tags_bitmap_show(void *data, struct seq_file *m) |
d7e3621a | 448 | { |
f57de23a | 449 | struct blk_mq_hw_ctx *hctx = data; |
d7e3621a | 450 | struct request_queue *q = hctx->queue; |
8c0f14ea | 451 | int res; |
d7e3621a | 452 | |
8c0f14ea BVA |
453 | res = mutex_lock_interruptible(&q->sysfs_lock); |
454 | if (res) | |
455 | goto out; | |
d7e3621a OS |
456 | if (hctx->tags) |
457 | sbitmap_bitmap_show(&hctx->tags->bitmap_tags.sb, m); | |
458 | mutex_unlock(&q->sysfs_lock); | |
8c0f14ea BVA |
459 | |
460 | out: | |
461 | return res; | |
d7e3621a OS |
462 | } |
463 | ||
f57de23a | 464 | static int hctx_sched_tags_show(void *data, struct seq_file *m) |
d96b37c0 | 465 | { |
f57de23a | 466 | struct blk_mq_hw_ctx *hctx = data; |
d96b37c0 | 467 | struct request_queue *q = hctx->queue; |
8c0f14ea | 468 | int res; |
d96b37c0 | 469 | |
8c0f14ea BVA |
470 | res = mutex_lock_interruptible(&q->sysfs_lock); |
471 | if (res) | |
472 | goto out; | |
d96b37c0 OS |
473 | if (hctx->sched_tags) |
474 | blk_mq_debugfs_tags_show(m, hctx->sched_tags); | |
475 | mutex_unlock(&q->sysfs_lock); | |
476 | ||
8c0f14ea BVA |
477 | out: |
478 | return res; | |
d96b37c0 OS |
479 | } |
480 | ||
f57de23a | 481 | static int hctx_sched_tags_bitmap_show(void *data, struct seq_file *m) |
d7e3621a | 482 | { |
f57de23a | 483 | struct blk_mq_hw_ctx *hctx = data; |
d7e3621a | 484 | struct request_queue *q = hctx->queue; |
8c0f14ea | 485 | int res; |
d7e3621a | 486 | |
8c0f14ea BVA |
487 | res = mutex_lock_interruptible(&q->sysfs_lock); |
488 | if (res) | |
489 | goto out; | |
d7e3621a OS |
490 | if (hctx->sched_tags) |
491 | sbitmap_bitmap_show(&hctx->sched_tags->bitmap_tags.sb, m); | |
492 | mutex_unlock(&q->sysfs_lock); | |
8c0f14ea BVA |
493 | |
494 | out: | |
495 | return res; | |
d7e3621a OS |
496 | } |
497 | ||
f57de23a | 498 | static int hctx_io_poll_show(void *data, struct seq_file *m) |
be215473 | 499 | { |
f57de23a | 500 | struct blk_mq_hw_ctx *hctx = data; |
be215473 OS |
501 | |
502 | seq_printf(m, "considered=%lu\n", hctx->poll_considered); | |
503 | seq_printf(m, "invoked=%lu\n", hctx->poll_invoked); | |
504 | seq_printf(m, "success=%lu\n", hctx->poll_success); | |
505 | return 0; | |
506 | } | |
507 | ||
f57de23a | 508 | static ssize_t hctx_io_poll_write(void *data, const char __user *buf, |
be215473 OS |
509 | size_t count, loff_t *ppos) |
510 | { | |
f57de23a | 511 | struct blk_mq_hw_ctx *hctx = data; |
be215473 OS |
512 | |
513 | hctx->poll_considered = hctx->poll_invoked = hctx->poll_success = 0; | |
514 | return count; | |
515 | } | |
516 | ||
f57de23a | 517 | static int hctx_dispatched_show(void *data, struct seq_file *m) |
be215473 | 518 | { |
f57de23a | 519 | struct blk_mq_hw_ctx *hctx = data; |
be215473 OS |
520 | int i; |
521 | ||
522 | seq_printf(m, "%8u\t%lu\n", 0U, hctx->dispatched[0]); | |
523 | ||
524 | for (i = 1; i < BLK_MQ_MAX_DISPATCH_ORDER - 1; i++) { | |
525 | unsigned int d = 1U << (i - 1); | |
526 | ||
527 | seq_printf(m, "%8u\t%lu\n", d, hctx->dispatched[i]); | |
528 | } | |
529 | ||
530 | seq_printf(m, "%8u+\t%lu\n", 1U << (i - 1), hctx->dispatched[i]); | |
531 | return 0; | |
532 | } | |
533 | ||
f57de23a | 534 | static ssize_t hctx_dispatched_write(void *data, const char __user *buf, |
be215473 OS |
535 | size_t count, loff_t *ppos) |
536 | { | |
f57de23a | 537 | struct blk_mq_hw_ctx *hctx = data; |
be215473 OS |
538 | int i; |
539 | ||
540 | for (i = 0; i < BLK_MQ_MAX_DISPATCH_ORDER; i++) | |
541 | hctx->dispatched[i] = 0; | |
542 | return count; | |
543 | } | |
544 | ||
f57de23a | 545 | static int hctx_queued_show(void *data, struct seq_file *m) |
4a46f05e | 546 | { |
f57de23a | 547 | struct blk_mq_hw_ctx *hctx = data; |
4a46f05e OS |
548 | |
549 | seq_printf(m, "%lu\n", hctx->queued); | |
550 | return 0; | |
551 | } | |
552 | ||
f57de23a | 553 | static ssize_t hctx_queued_write(void *data, const char __user *buf, |
4a46f05e OS |
554 | size_t count, loff_t *ppos) |
555 | { | |
f57de23a | 556 | struct blk_mq_hw_ctx *hctx = data; |
4a46f05e OS |
557 | |
558 | hctx->queued = 0; | |
559 | return count; | |
560 | } | |
561 | ||
f57de23a | 562 | static int hctx_run_show(void *data, struct seq_file *m) |
4a46f05e | 563 | { |
f57de23a | 564 | struct blk_mq_hw_ctx *hctx = data; |
4a46f05e OS |
565 | |
566 | seq_printf(m, "%lu\n", hctx->run); | |
567 | return 0; | |
568 | } | |
569 | ||
f57de23a OS |
570 | static ssize_t hctx_run_write(void *data, const char __user *buf, size_t count, |
571 | loff_t *ppos) | |
4a46f05e | 572 | { |
f57de23a | 573 | struct blk_mq_hw_ctx *hctx = data; |
4a46f05e OS |
574 | |
575 | hctx->run = 0; | |
576 | return count; | |
577 | } | |
578 | ||
f57de23a | 579 | static int hctx_active_show(void *data, struct seq_file *m) |
4a46f05e | 580 | { |
f57de23a | 581 | struct blk_mq_hw_ctx *hctx = data; |
4a46f05e OS |
582 | |
583 | seq_printf(m, "%d\n", atomic_read(&hctx->nr_active)); | |
584 | return 0; | |
585 | } | |
586 | ||
950cd7e9 | 587 | static void *ctx_rq_list_start(struct seq_file *m, loff_t *pos) |
f3bcb0e6 | 588 | __acquires(&ctx->lock) |
950cd7e9 OS |
589 | { |
590 | struct blk_mq_ctx *ctx = m->private; | |
591 | ||
592 | spin_lock(&ctx->lock); | |
593 | return seq_list_start(&ctx->rq_list, *pos); | |
594 | } | |
595 | ||
596 | static void *ctx_rq_list_next(struct seq_file *m, void *v, loff_t *pos) | |
597 | { | |
598 | struct blk_mq_ctx *ctx = m->private; | |
599 | ||
600 | return seq_list_next(v, &ctx->rq_list, pos); | |
601 | } | |
602 | ||
603 | static void ctx_rq_list_stop(struct seq_file *m, void *v) | |
f3bcb0e6 | 604 | __releases(&ctx->lock) |
950cd7e9 OS |
605 | { |
606 | struct blk_mq_ctx *ctx = m->private; | |
607 | ||
608 | spin_unlock(&ctx->lock); | |
609 | } | |
610 | ||
611 | static const struct seq_operations ctx_rq_list_seq_ops = { | |
612 | .start = ctx_rq_list_start, | |
613 | .next = ctx_rq_list_next, | |
614 | .stop = ctx_rq_list_stop, | |
615 | .show = blk_mq_debugfs_rq_show, | |
616 | }; | |
f57de23a | 617 | static int ctx_dispatched_show(void *data, struct seq_file *m) |
4a46f05e | 618 | { |
f57de23a | 619 | struct blk_mq_ctx *ctx = data; |
4a46f05e OS |
620 | |
621 | seq_printf(m, "%lu %lu\n", ctx->rq_dispatched[1], ctx->rq_dispatched[0]); | |
622 | return 0; | |
623 | } | |
624 | ||
f57de23a | 625 | static ssize_t ctx_dispatched_write(void *data, const char __user *buf, |
4a46f05e OS |
626 | size_t count, loff_t *ppos) |
627 | { | |
f57de23a | 628 | struct blk_mq_ctx *ctx = data; |
4a46f05e OS |
629 | |
630 | ctx->rq_dispatched[0] = ctx->rq_dispatched[1] = 0; | |
631 | return count; | |
632 | } | |
633 | ||
f57de23a | 634 | static int ctx_merged_show(void *data, struct seq_file *m) |
4a46f05e | 635 | { |
f57de23a | 636 | struct blk_mq_ctx *ctx = data; |
4a46f05e OS |
637 | |
638 | seq_printf(m, "%lu\n", ctx->rq_merged); | |
639 | return 0; | |
640 | } | |
641 | ||
f57de23a OS |
642 | static ssize_t ctx_merged_write(void *data, const char __user *buf, |
643 | size_t count, loff_t *ppos) | |
4a46f05e | 644 | { |
f57de23a | 645 | struct blk_mq_ctx *ctx = data; |
4a46f05e OS |
646 | |
647 | ctx->rq_merged = 0; | |
648 | return count; | |
649 | } | |
650 | ||
f57de23a | 651 | static int ctx_completed_show(void *data, struct seq_file *m) |
4a46f05e | 652 | { |
f57de23a | 653 | struct blk_mq_ctx *ctx = data; |
4a46f05e OS |
654 | |
655 | seq_printf(m, "%lu %lu\n", ctx->rq_completed[1], ctx->rq_completed[0]); | |
656 | return 0; | |
657 | } | |
658 | ||
f57de23a OS |
659 | static ssize_t ctx_completed_write(void *data, const char __user *buf, |
660 | size_t count, loff_t *ppos) | |
4a46f05e | 661 | { |
f57de23a OS |
662 | struct blk_mq_ctx *ctx = data; |
663 | ||
664 | ctx->rq_completed[0] = ctx->rq_completed[1] = 0; | |
665 | return count; | |
4a46f05e OS |
666 | } |
667 | ||
f57de23a OS |
668 | static int blk_mq_debugfs_show(struct seq_file *m, void *v) |
669 | { | |
670 | const struct blk_mq_debugfs_attr *attr = m->private; | |
671 | void *data = d_inode(m->file->f_path.dentry->d_parent)->i_private; | |
672 | ||
673 | return attr->show(data, m); | |
674 | } | |
675 | ||
676 | static ssize_t blk_mq_debugfs_write(struct file *file, const char __user *buf, | |
677 | size_t count, loff_t *ppos) | |
4a46f05e OS |
678 | { |
679 | struct seq_file *m = file->private_data; | |
f57de23a OS |
680 | const struct blk_mq_debugfs_attr *attr = m->private; |
681 | void *data = d_inode(file->f_path.dentry->d_parent)->i_private; | |
4a46f05e | 682 | |
f57de23a OS |
683 | if (!attr->write) |
684 | return -EPERM; | |
685 | ||
686 | return attr->write(data, buf, count, ppos); | |
687 | } | |
688 | ||
689 | static int blk_mq_debugfs_open(struct inode *inode, struct file *file) | |
690 | { | |
691 | const struct blk_mq_debugfs_attr *attr = inode->i_private; | |
692 | void *data = d_inode(file->f_path.dentry->d_parent)->i_private; | |
693 | struct seq_file *m; | |
694 | int ret; | |
695 | ||
696 | if (attr->seq_ops) { | |
697 | ret = seq_open(file, attr->seq_ops); | |
698 | if (!ret) { | |
699 | m = file->private_data; | |
700 | m->private = data; | |
701 | } | |
702 | return ret; | |
703 | } | |
704 | ||
705 | if (WARN_ON_ONCE(!attr->show)) | |
706 | return -EPERM; | |
707 | ||
708 | return single_open(file, blk_mq_debugfs_show, inode->i_private); | |
4a46f05e OS |
709 | } |
710 | ||
f57de23a OS |
711 | static int blk_mq_debugfs_release(struct inode *inode, struct file *file) |
712 | { | |
713 | const struct blk_mq_debugfs_attr *attr = inode->i_private; | |
714 | ||
715 | if (attr->show) | |
716 | return single_release(inode, file); | |
717 | else | |
718 | return seq_release(inode, file); | |
719 | } | |
720 | ||
721 | const struct file_operations blk_mq_debugfs_fops = { | |
722 | .open = blk_mq_debugfs_open, | |
4a46f05e | 723 | .read = seq_read, |
f57de23a | 724 | .write = blk_mq_debugfs_write, |
4a46f05e | 725 | .llseek = seq_lseek, |
f57de23a | 726 | .release = blk_mq_debugfs_release, |
4a46f05e OS |
727 | }; |
728 | ||
34dbad5d | 729 | static const struct blk_mq_debugfs_attr blk_mq_debugfs_queue_attrs[] = { |
f57de23a | 730 | {"poll_stat", 0400, queue_poll_stat_show}, |
8ef1a191 | 731 | {"requeue_list", 0400, .seq_ops = &queue_requeue_list_seq_ops}, |
f57de23a | 732 | {"state", 0600, queue_state_show, queue_state_write}, |
34dbad5d OS |
733 | {}, |
734 | }; | |
735 | ||
07e4fead | 736 | static const struct blk_mq_debugfs_attr blk_mq_debugfs_hctx_attrs[] = { |
f57de23a OS |
737 | {"state", 0400, hctx_state_show}, |
738 | {"flags", 0400, hctx_flags_show}, | |
739 | {"dispatch", 0400, .seq_ops = &hctx_dispatch_seq_ops}, | |
2720bab5 | 740 | {"busy", 0400, hctx_busy_show}, |
f57de23a OS |
741 | {"ctx_map", 0400, hctx_ctx_map_show}, |
742 | {"tags", 0400, hctx_tags_show}, | |
743 | {"tags_bitmap", 0400, hctx_tags_bitmap_show}, | |
744 | {"sched_tags", 0400, hctx_sched_tags_show}, | |
745 | {"sched_tags_bitmap", 0400, hctx_sched_tags_bitmap_show}, | |
746 | {"io_poll", 0600, hctx_io_poll_show, hctx_io_poll_write}, | |
747 | {"dispatched", 0600, hctx_dispatched_show, hctx_dispatched_write}, | |
748 | {"queued", 0600, hctx_queued_show, hctx_queued_write}, | |
749 | {"run", 0600, hctx_run_show, hctx_run_write}, | |
750 | {"active", 0400, hctx_active_show}, | |
72f2f8f6 | 751 | {}, |
07e4fead OS |
752 | }; |
753 | ||
754 | static const struct blk_mq_debugfs_attr blk_mq_debugfs_ctx_attrs[] = { | |
f57de23a OS |
755 | {"rq_list", 0400, .seq_ops = &ctx_rq_list_seq_ops}, |
756 | {"dispatched", 0600, ctx_dispatched_show, ctx_dispatched_write}, | |
757 | {"merged", 0600, ctx_merged_show, ctx_merged_write}, | |
758 | {"completed", 0600, ctx_completed_show, ctx_completed_write}, | |
72f2f8f6 | 759 | {}, |
07e4fead OS |
760 | }; |
761 | ||
9c1051aa OS |
762 | static bool debugfs_create_files(struct dentry *parent, void *data, |
763 | const struct blk_mq_debugfs_attr *attr) | |
764 | { | |
765 | d_inode(parent)->i_private = data; | |
766 | ||
767 | for (; attr->name; attr++) { | |
768 | if (!debugfs_create_file(attr->name, attr->mode, parent, | |
769 | (void *)attr, &blk_mq_debugfs_fops)) | |
770 | return false; | |
771 | } | |
772 | return true; | |
773 | } | |
774 | ||
4c9e4019 | 775 | int blk_mq_debugfs_register(struct request_queue *q) |
07e4fead | 776 | { |
9c1051aa OS |
777 | struct blk_mq_hw_ctx *hctx; |
778 | int i; | |
779 | ||
18fbda91 | 780 | if (!blk_debugfs_root) |
07e4fead OS |
781 | return -ENOENT; |
782 | ||
4c9e4019 BVA |
783 | q->debugfs_dir = debugfs_create_dir(kobject_name(q->kobj.parent), |
784 | blk_debugfs_root); | |
07e4fead | 785 | if (!q->debugfs_dir) |
9c1051aa | 786 | return -ENOMEM; |
07e4fead | 787 | |
9c1051aa OS |
788 | if (!debugfs_create_files(q->debugfs_dir, q, |
789 | blk_mq_debugfs_queue_attrs)) | |
07e4fead OS |
790 | goto err; |
791 | ||
9c1051aa OS |
792 | /* |
793 | * blk_mq_init_hctx() attempted to do this already, but q->debugfs_dir | |
794 | * didn't exist yet (because we don't know what to name the directory | |
795 | * until the queue is registered to a gendisk). | |
796 | */ | |
797 | queue_for_each_hw_ctx(q, hctx, i) { | |
798 | if (!hctx->debugfs_dir && blk_mq_debugfs_register_hctx(q, hctx)) | |
799 | goto err; | |
d332ce09 OS |
800 | if (q->elevator && !hctx->sched_debugfs_dir && |
801 | blk_mq_debugfs_register_sched_hctx(q, hctx)) | |
802 | goto err; | |
9c1051aa OS |
803 | } |
804 | ||
07e4fead OS |
805 | return 0; |
806 | ||
807 | err: | |
808 | blk_mq_debugfs_unregister(q); | |
809 | return -ENOMEM; | |
810 | } | |
811 | ||
812 | void blk_mq_debugfs_unregister(struct request_queue *q) | |
813 | { | |
814 | debugfs_remove_recursive(q->debugfs_dir); | |
d332ce09 | 815 | q->sched_debugfs_dir = NULL; |
07e4fead OS |
816 | q->debugfs_dir = NULL; |
817 | } | |
818 | ||
9c1051aa OS |
819 | static int blk_mq_debugfs_register_ctx(struct blk_mq_hw_ctx *hctx, |
820 | struct blk_mq_ctx *ctx) | |
07e4fead OS |
821 | { |
822 | struct dentry *ctx_dir; | |
823 | char name[20]; | |
07e4fead OS |
824 | |
825 | snprintf(name, sizeof(name), "cpu%u", ctx->cpu); | |
9c1051aa | 826 | ctx_dir = debugfs_create_dir(name, hctx->debugfs_dir); |
07e4fead OS |
827 | if (!ctx_dir) |
828 | return -ENOMEM; | |
829 | ||
72f2f8f6 BVA |
830 | if (!debugfs_create_files(ctx_dir, ctx, blk_mq_debugfs_ctx_attrs)) |
831 | return -ENOMEM; | |
07e4fead OS |
832 | |
833 | return 0; | |
834 | } | |
835 | ||
9c1051aa OS |
836 | int blk_mq_debugfs_register_hctx(struct request_queue *q, |
837 | struct blk_mq_hw_ctx *hctx) | |
07e4fead OS |
838 | { |
839 | struct blk_mq_ctx *ctx; | |
07e4fead OS |
840 | char name[20]; |
841 | int i; | |
842 | ||
9c1051aa OS |
843 | if (!q->debugfs_dir) |
844 | return -ENOENT; | |
845 | ||
88aabbd7 | 846 | snprintf(name, sizeof(name), "hctx%u", hctx->queue_num); |
9c1051aa OS |
847 | hctx->debugfs_dir = debugfs_create_dir(name, q->debugfs_dir); |
848 | if (!hctx->debugfs_dir) | |
07e4fead OS |
849 | return -ENOMEM; |
850 | ||
9c1051aa OS |
851 | if (!debugfs_create_files(hctx->debugfs_dir, hctx, |
852 | blk_mq_debugfs_hctx_attrs)) | |
853 | goto err; | |
07e4fead OS |
854 | |
855 | hctx_for_each_ctx(hctx, ctx, i) { | |
9c1051aa OS |
856 | if (blk_mq_debugfs_register_ctx(hctx, ctx)) |
857 | goto err; | |
07e4fead OS |
858 | } |
859 | ||
860 | return 0; | |
9c1051aa OS |
861 | |
862 | err: | |
863 | blk_mq_debugfs_unregister_hctx(hctx); | |
864 | return -ENOMEM; | |
865 | } | |
866 | ||
867 | void blk_mq_debugfs_unregister_hctx(struct blk_mq_hw_ctx *hctx) | |
868 | { | |
869 | debugfs_remove_recursive(hctx->debugfs_dir); | |
d332ce09 | 870 | hctx->sched_debugfs_dir = NULL; |
9c1051aa | 871 | hctx->debugfs_dir = NULL; |
07e4fead OS |
872 | } |
873 | ||
9c1051aa | 874 | int blk_mq_debugfs_register_hctxs(struct request_queue *q) |
07e4fead OS |
875 | { |
876 | struct blk_mq_hw_ctx *hctx; | |
877 | int i; | |
878 | ||
07e4fead OS |
879 | queue_for_each_hw_ctx(q, hctx, i) { |
880 | if (blk_mq_debugfs_register_hctx(q, hctx)) | |
9c1051aa | 881 | return -ENOMEM; |
07e4fead OS |
882 | } |
883 | ||
884 | return 0; | |
07e4fead OS |
885 | } |
886 | ||
9c1051aa | 887 | void blk_mq_debugfs_unregister_hctxs(struct request_queue *q) |
07e4fead | 888 | { |
9c1051aa OS |
889 | struct blk_mq_hw_ctx *hctx; |
890 | int i; | |
891 | ||
892 | queue_for_each_hw_ctx(q, hctx, i) | |
893 | blk_mq_debugfs_unregister_hctx(hctx); | |
07e4fead | 894 | } |
d332ce09 OS |
895 | |
896 | int blk_mq_debugfs_register_sched(struct request_queue *q) | |
897 | { | |
898 | struct elevator_type *e = q->elevator->type; | |
899 | ||
900 | if (!q->debugfs_dir) | |
901 | return -ENOENT; | |
902 | ||
903 | if (!e->queue_debugfs_attrs) | |
904 | return 0; | |
905 | ||
906 | q->sched_debugfs_dir = debugfs_create_dir("sched", q->debugfs_dir); | |
907 | if (!q->sched_debugfs_dir) | |
908 | return -ENOMEM; | |
909 | ||
910 | if (!debugfs_create_files(q->sched_debugfs_dir, q, | |
911 | e->queue_debugfs_attrs)) | |
912 | goto err; | |
913 | ||
914 | return 0; | |
915 | ||
916 | err: | |
917 | blk_mq_debugfs_unregister_sched(q); | |
918 | return -ENOMEM; | |
919 | } | |
920 | ||
921 | void blk_mq_debugfs_unregister_sched(struct request_queue *q) | |
922 | { | |
923 | debugfs_remove_recursive(q->sched_debugfs_dir); | |
924 | q->sched_debugfs_dir = NULL; | |
925 | } | |
926 | ||
927 | int blk_mq_debugfs_register_sched_hctx(struct request_queue *q, | |
928 | struct blk_mq_hw_ctx *hctx) | |
929 | { | |
930 | struct elevator_type *e = q->elevator->type; | |
931 | ||
932 | if (!hctx->debugfs_dir) | |
933 | return -ENOENT; | |
934 | ||
935 | if (!e->hctx_debugfs_attrs) | |
936 | return 0; | |
937 | ||
938 | hctx->sched_debugfs_dir = debugfs_create_dir("sched", | |
939 | hctx->debugfs_dir); | |
940 | if (!hctx->sched_debugfs_dir) | |
941 | return -ENOMEM; | |
942 | ||
943 | if (!debugfs_create_files(hctx->sched_debugfs_dir, hctx, | |
944 | e->hctx_debugfs_attrs)) | |
945 | return -ENOMEM; | |
946 | ||
947 | return 0; | |
948 | } | |
949 | ||
950 | void blk_mq_debugfs_unregister_sched_hctx(struct blk_mq_hw_ctx *hctx) | |
951 | { | |
952 | debugfs_remove_recursive(hctx->sched_debugfs_dir); | |
953 | hctx->sched_debugfs_dir = NULL; | |
954 | } |