Commit | Line | Data |
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8c16567d | 1 | // SPDX-License-Identifier: GPL-2.0 |
07e4fead OS |
2 | /* |
3 | * Copyright (C) 2017 Facebook | |
07e4fead OS |
4 | */ |
5 | ||
6 | #include <linux/kernel.h> | |
7 | #include <linux/blkdev.h> | |
8 | #include <linux/debugfs.h> | |
9 | ||
10 | #include <linux/blk-mq.h> | |
18fbda91 | 11 | #include "blk.h" |
07e4fead | 12 | #include "blk-mq.h" |
d173a251 | 13 | #include "blk-mq-debugfs.h" |
d96b37c0 | 14 | #include "blk-mq-tag.h" |
cc56694f | 15 | #include "blk-rq-qos.h" |
07e4fead | 16 | |
1209cb7f BVA |
17 | static void print_stat(struct seq_file *m, struct blk_rq_stat *stat) |
18 | { | |
19 | if (stat->nr_samples) { | |
315eb656 | 20 | seq_printf(m, "samples=%d, mean=%llu, min=%llu, max=%llu", |
1209cb7f BVA |
21 | stat->nr_samples, stat->mean, stat->min, stat->max); |
22 | } else { | |
23 | seq_puts(m, "samples=0"); | |
24 | } | |
25 | } | |
26 | ||
27 | static int queue_poll_stat_show(void *data, struct seq_file *m) | |
28 | { | |
29 | struct request_queue *q = data; | |
30 | int bucket; | |
31 | ||
243d9f78 CK |
32 | for (bucket = 0; bucket < (BLK_MQ_POLL_STATS_BKTS / 2); bucket++) { |
33 | seq_printf(m, "read (%d Bytes): ", 1 << (9 + bucket)); | |
34 | print_stat(m, &q->poll_stat[2 * bucket]); | |
1209cb7f BVA |
35 | seq_puts(m, "\n"); |
36 | ||
243d9f78 CK |
37 | seq_printf(m, "write (%d Bytes): ", 1 << (9 + bucket)); |
38 | print_stat(m, &q->poll_stat[2 * bucket + 1]); | |
1209cb7f BVA |
39 | seq_puts(m, "\n"); |
40 | } | |
41 | return 0; | |
42 | } | |
43 | ||
44 | static void *queue_requeue_list_start(struct seq_file *m, loff_t *pos) | |
45 | __acquires(&q->requeue_lock) | |
46 | { | |
47 | struct request_queue *q = m->private; | |
48 | ||
49 | spin_lock_irq(&q->requeue_lock); | |
50 | return seq_list_start(&q->requeue_list, *pos); | |
51 | } | |
52 | ||
53 | static void *queue_requeue_list_next(struct seq_file *m, void *v, loff_t *pos) | |
54 | { | |
55 | struct request_queue *q = m->private; | |
56 | ||
57 | return seq_list_next(v, &q->requeue_list, pos); | |
58 | } | |
59 | ||
60 | static void queue_requeue_list_stop(struct seq_file *m, void *v) | |
61 | __releases(&q->requeue_lock) | |
62 | { | |
63 | struct request_queue *q = m->private; | |
64 | ||
65 | spin_unlock_irq(&q->requeue_lock); | |
66 | } | |
67 | ||
68 | static const struct seq_operations queue_requeue_list_seq_ops = { | |
69 | .start = queue_requeue_list_start, | |
70 | .next = queue_requeue_list_next, | |
71 | .stop = queue_requeue_list_stop, | |
72 | .show = blk_mq_debugfs_rq_show, | |
73 | }; | |
74 | ||
91d68905 BVA |
75 | static int blk_flags_show(struct seq_file *m, const unsigned long flags, |
76 | const char *const *flag_name, int flag_name_count) | |
77 | { | |
78 | bool sep = false; | |
79 | int i; | |
80 | ||
81 | for (i = 0; i < sizeof(flags) * BITS_PER_BYTE; i++) { | |
82 | if (!(flags & BIT(i))) | |
83 | continue; | |
84 | if (sep) | |
bec03d6b | 85 | seq_puts(m, "|"); |
91d68905 BVA |
86 | sep = true; |
87 | if (i < flag_name_count && flag_name[i]) | |
88 | seq_puts(m, flag_name[i]); | |
89 | else | |
90 | seq_printf(m, "%d", i); | |
91 | } | |
91d68905 BVA |
92 | return 0; |
93 | } | |
94 | ||
cd84a62e BVA |
95 | static int queue_pm_only_show(void *data, struct seq_file *m) |
96 | { | |
97 | struct request_queue *q = data; | |
98 | ||
99 | seq_printf(m, "%d\n", atomic_read(&q->pm_only)); | |
100 | return 0; | |
101 | } | |
102 | ||
1a435111 | 103 | #define QUEUE_FLAG_NAME(name) [QUEUE_FLAG_##name] = #name |
91d68905 | 104 | static const char *const blk_queue_flag_name[] = { |
1a435111 | 105 | QUEUE_FLAG_NAME(STOPPED), |
1a435111 | 106 | QUEUE_FLAG_NAME(DYING), |
1a435111 OS |
107 | QUEUE_FLAG_NAME(NOMERGES), |
108 | QUEUE_FLAG_NAME(SAME_COMP), | |
109 | QUEUE_FLAG_NAME(FAIL_IO), | |
1a435111 OS |
110 | QUEUE_FLAG_NAME(NONROT), |
111 | QUEUE_FLAG_NAME(IO_STAT), | |
112 | QUEUE_FLAG_NAME(DISCARD), | |
113 | QUEUE_FLAG_NAME(NOXMERGES), | |
114 | QUEUE_FLAG_NAME(ADD_RANDOM), | |
115 | QUEUE_FLAG_NAME(SECERASE), | |
116 | QUEUE_FLAG_NAME(SAME_FORCE), | |
117 | QUEUE_FLAG_NAME(DEAD), | |
118 | QUEUE_FLAG_NAME(INIT_DONE), | |
1cb039f3 | 119 | QUEUE_FLAG_NAME(STABLE_WRITES), |
1a435111 OS |
120 | QUEUE_FLAG_NAME(POLL), |
121 | QUEUE_FLAG_NAME(WC), | |
122 | QUEUE_FLAG_NAME(FUA), | |
1a435111 OS |
123 | QUEUE_FLAG_NAME(DAX), |
124 | QUEUE_FLAG_NAME(STATS), | |
1a435111 | 125 | QUEUE_FLAG_NAME(REGISTERED), |
22d53821 | 126 | QUEUE_FLAG_NAME(QUIESCED), |
bfe373f6 HT |
127 | QUEUE_FLAG_NAME(PCI_P2PDMA), |
128 | QUEUE_FLAG_NAME(ZONE_RESETALL), | |
129 | QUEUE_FLAG_NAME(RQ_ALLOC_TIME), | |
1dbdd99b | 130 | QUEUE_FLAG_NAME(HCTX_ACTIVE), |
dc304326 | 131 | QUEUE_FLAG_NAME(NOWAIT), |
91d68905 | 132 | }; |
1a435111 | 133 | #undef QUEUE_FLAG_NAME |
91d68905 | 134 | |
f57de23a | 135 | static int queue_state_show(void *data, struct seq_file *m) |
91d68905 | 136 | { |
f57de23a | 137 | struct request_queue *q = data; |
91d68905 BVA |
138 | |
139 | blk_flags_show(m, q->queue_flags, blk_queue_flag_name, | |
140 | ARRAY_SIZE(blk_queue_flag_name)); | |
fd07dc81 | 141 | seq_puts(m, "\n"); |
91d68905 BVA |
142 | return 0; |
143 | } | |
144 | ||
f57de23a OS |
145 | static ssize_t queue_state_write(void *data, const char __user *buf, |
146 | size_t count, loff_t *ppos) | |
91d68905 | 147 | { |
f57de23a | 148 | struct request_queue *q = data; |
71b90511 | 149 | char opbuf[16] = { }, *op; |
91d68905 | 150 | |
18d4d7d0 BVA |
151 | /* |
152 | * The "state" attribute is removed after blk_cleanup_queue() has called | |
153 | * blk_mq_free_queue(). Return if QUEUE_FLAG_DEAD has been set to avoid | |
154 | * triggering a use-after-free. | |
155 | */ | |
156 | if (blk_queue_dead(q)) | |
157 | return -ENOENT; | |
158 | ||
71b90511 | 159 | if (count >= sizeof(opbuf)) { |
c7e4145a OS |
160 | pr_err("%s: operation too long\n", __func__); |
161 | goto inval; | |
162 | } | |
163 | ||
71b90511 | 164 | if (copy_from_user(opbuf, buf, count)) |
91d68905 | 165 | return -EFAULT; |
71b90511 | 166 | op = strstrip(opbuf); |
91d68905 BVA |
167 | if (strcmp(op, "run") == 0) { |
168 | blk_mq_run_hw_queues(q, true); | |
169 | } else if (strcmp(op, "start") == 0) { | |
170 | blk_mq_start_stopped_hw_queues(q, true); | |
edea55ab BVA |
171 | } else if (strcmp(op, "kick") == 0) { |
172 | blk_mq_kick_requeue_list(q); | |
91d68905 | 173 | } else { |
c7e4145a OS |
174 | pr_err("%s: unsupported operation '%s'\n", __func__, op); |
175 | inval: | |
edea55ab | 176 | pr_err("%s: use 'run', 'start' or 'kick'\n", __func__); |
91d68905 BVA |
177 | return -EINVAL; |
178 | } | |
c7e4145a | 179 | return count; |
91d68905 BVA |
180 | } |
181 | ||
f793dfd3 JA |
182 | static int queue_write_hint_show(void *data, struct seq_file *m) |
183 | { | |
184 | struct request_queue *q = data; | |
185 | int i; | |
186 | ||
187 | for (i = 0; i < BLK_MAX_WRITE_HINTS; i++) | |
188 | seq_printf(m, "hint%d: %llu\n", i, q->write_hints[i]); | |
189 | ||
190 | return 0; | |
191 | } | |
192 | ||
193 | static ssize_t queue_write_hint_store(void *data, const char __user *buf, | |
194 | size_t count, loff_t *ppos) | |
195 | { | |
196 | struct request_queue *q = data; | |
197 | int i; | |
198 | ||
199 | for (i = 0; i < BLK_MAX_WRITE_HINTS; i++) | |
200 | q->write_hints[i] = 0; | |
201 | ||
202 | return count; | |
203 | } | |
204 | ||
1209cb7f BVA |
205 | static const struct blk_mq_debugfs_attr blk_mq_debugfs_queue_attrs[] = { |
206 | { "poll_stat", 0400, queue_poll_stat_show }, | |
207 | { "requeue_list", 0400, .seq_ops = &queue_requeue_list_seq_ops }, | |
cd84a62e | 208 | { "pm_only", 0600, queue_pm_only_show, NULL }, |
1209cb7f BVA |
209 | { "state", 0600, queue_state_show, queue_state_write }, |
210 | { "write_hints", 0600, queue_write_hint_show, queue_write_hint_store }, | |
18bc4230 | 211 | { "zone_wlock", 0400, queue_zone_wlock_show, NULL }, |
1209cb7f BVA |
212 | { }, |
213 | }; | |
34dbad5d | 214 | |
1a435111 | 215 | #define HCTX_STATE_NAME(name) [BLK_MQ_S_##name] = #name |
f5c0b091 | 216 | static const char *const hctx_state_name[] = { |
1a435111 OS |
217 | HCTX_STATE_NAME(STOPPED), |
218 | HCTX_STATE_NAME(TAG_ACTIVE), | |
219 | HCTX_STATE_NAME(SCHED_RESTART), | |
bf0beec0 | 220 | HCTX_STATE_NAME(INACTIVE), |
f5c0b091 | 221 | }; |
1a435111 OS |
222 | #undef HCTX_STATE_NAME |
223 | ||
f57de23a | 224 | static int hctx_state_show(void *data, struct seq_file *m) |
9abb2ad2 | 225 | { |
f57de23a | 226 | struct blk_mq_hw_ctx *hctx = data; |
9abb2ad2 | 227 | |
f5c0b091 BVA |
228 | blk_flags_show(m, hctx->state, hctx_state_name, |
229 | ARRAY_SIZE(hctx_state_name)); | |
fd07dc81 | 230 | seq_puts(m, "\n"); |
9abb2ad2 OS |
231 | return 0; |
232 | } | |
233 | ||
1a435111 | 234 | #define BLK_TAG_ALLOC_NAME(name) [BLK_TAG_ALLOC_##name] = #name |
f5c0b091 | 235 | static const char *const alloc_policy_name[] = { |
1a435111 OS |
236 | BLK_TAG_ALLOC_NAME(FIFO), |
237 | BLK_TAG_ALLOC_NAME(RR), | |
f5c0b091 | 238 | }; |
1a435111 | 239 | #undef BLK_TAG_ALLOC_NAME |
f5c0b091 | 240 | |
1a435111 | 241 | #define HCTX_FLAG_NAME(name) [ilog2(BLK_MQ_F_##name)] = #name |
f5c0b091 | 242 | static const char *const hctx_flag_name[] = { |
1a435111 | 243 | HCTX_FLAG_NAME(SHOULD_MERGE), |
51db1c37 | 244 | HCTX_FLAG_NAME(TAG_QUEUE_SHARED), |
1a435111 OS |
245 | HCTX_FLAG_NAME(BLOCKING), |
246 | HCTX_FLAG_NAME(NO_SCHED), | |
bf0beec0 | 247 | HCTX_FLAG_NAME(STACKING), |
02f938e9 | 248 | HCTX_FLAG_NAME(TAG_HCTX_SHARED), |
f5c0b091 | 249 | }; |
1a435111 | 250 | #undef HCTX_FLAG_NAME |
f5c0b091 | 251 | |
f57de23a | 252 | static int hctx_flags_show(void *data, struct seq_file *m) |
9abb2ad2 | 253 | { |
f57de23a | 254 | struct blk_mq_hw_ctx *hctx = data; |
f5c0b091 | 255 | const int alloc_policy = BLK_MQ_FLAG_TO_ALLOC_POLICY(hctx->flags); |
9abb2ad2 | 256 | |
f5c0b091 BVA |
257 | seq_puts(m, "alloc_policy="); |
258 | if (alloc_policy < ARRAY_SIZE(alloc_policy_name) && | |
259 | alloc_policy_name[alloc_policy]) | |
260 | seq_puts(m, alloc_policy_name[alloc_policy]); | |
261 | else | |
262 | seq_printf(m, "%d", alloc_policy); | |
263 | seq_puts(m, " "); | |
264 | blk_flags_show(m, | |
265 | hctx->flags ^ BLK_ALLOC_POLICY_TO_MQ_FLAG(alloc_policy), | |
266 | hctx_flag_name, ARRAY_SIZE(hctx_flag_name)); | |
fd07dc81 | 267 | seq_puts(m, "\n"); |
9abb2ad2 OS |
268 | return 0; |
269 | } | |
270 | ||
1a435111 | 271 | #define CMD_FLAG_NAME(name) [__REQ_##name] = #name |
8658dca8 | 272 | static const char *const cmd_flag_name[] = { |
1a435111 OS |
273 | CMD_FLAG_NAME(FAILFAST_DEV), |
274 | CMD_FLAG_NAME(FAILFAST_TRANSPORT), | |
275 | CMD_FLAG_NAME(FAILFAST_DRIVER), | |
276 | CMD_FLAG_NAME(SYNC), | |
277 | CMD_FLAG_NAME(META), | |
278 | CMD_FLAG_NAME(PRIO), | |
279 | CMD_FLAG_NAME(NOMERGE), | |
280 | CMD_FLAG_NAME(IDLE), | |
281 | CMD_FLAG_NAME(INTEGRITY), | |
282 | CMD_FLAG_NAME(FUA), | |
283 | CMD_FLAG_NAME(PREFLUSH), | |
284 | CMD_FLAG_NAME(RAHEAD), | |
285 | CMD_FLAG_NAME(BACKGROUND), | |
22d53821 | 286 | CMD_FLAG_NAME(NOWAIT), |
1c26010c | 287 | CMD_FLAG_NAME(NOUNMAP), |
6ce913fe | 288 | CMD_FLAG_NAME(POLLED), |
8658dca8 | 289 | }; |
1a435111 | 290 | #undef CMD_FLAG_NAME |
8658dca8 | 291 | |
1a435111 | 292 | #define RQF_NAME(name) [ilog2((__force u32)RQF_##name)] = #name |
8658dca8 | 293 | static const char *const rqf_name[] = { |
85ba3eff | 294 | RQF_NAME(STARTED), |
1a435111 OS |
295 | RQF_NAME(SOFTBARRIER), |
296 | RQF_NAME(FLUSH_SEQ), | |
297 | RQF_NAME(MIXED_MERGE), | |
298 | RQF_NAME(MQ_INFLIGHT), | |
299 | RQF_NAME(DONTPREP), | |
1a435111 OS |
300 | RQF_NAME(FAILED), |
301 | RQF_NAME(QUIET), | |
302 | RQF_NAME(ELVPRIV), | |
303 | RQF_NAME(IO_STAT), | |
1a435111 OS |
304 | RQF_NAME(PM), |
305 | RQF_NAME(HASHED), | |
306 | RQF_NAME(STATS), | |
307 | RQF_NAME(SPECIAL_PAYLOAD), | |
5d75d3f2 | 308 | RQF_NAME(ZONE_WRITE_LOCKED), |
76a86f9d | 309 | RQF_NAME(MQ_POLL_SLEPT), |
62ba0c00 | 310 | RQF_NAME(ELV), |
8658dca8 | 311 | }; |
1a435111 | 312 | #undef RQF_NAME |
8658dca8 | 313 | |
ec6dcf63 BVA |
314 | static const char *const blk_mq_rq_state_name_array[] = { |
315 | [MQ_RQ_IDLE] = "idle", | |
316 | [MQ_RQ_IN_FLIGHT] = "in_flight", | |
317 | [MQ_RQ_COMPLETE] = "complete", | |
318 | }; | |
319 | ||
320 | static const char *blk_mq_rq_state_name(enum mq_rq_state rq_state) | |
321 | { | |
a1e79188 | 322 | if (WARN_ON_ONCE((unsigned int)rq_state >= |
ec6dcf63 BVA |
323 | ARRAY_SIZE(blk_mq_rq_state_name_array))) |
324 | return "(?)"; | |
325 | return blk_mq_rq_state_name_array[rq_state]; | |
326 | } | |
327 | ||
daaadb3e | 328 | int __blk_mq_debugfs_rq_show(struct seq_file *m, struct request *rq) |
950cd7e9 | 329 | { |
2836ee4b | 330 | const struct blk_mq_ops *const mq_ops = rq->q->mq_ops; |
f9bc64a0 | 331 | const unsigned int op = req_op(rq); |
874c893b | 332 | const char *op_str = blk_op_str(op); |
950cd7e9 | 333 | |
8658dca8 | 334 | seq_printf(m, "%p {.op=", rq); |
874c893b | 335 | if (strcmp(op_str, "UNKNOWN") == 0) |
3f6d385f | 336 | seq_printf(m, "%u", op); |
8658dca8 | 337 | else |
874c893b | 338 | seq_printf(m, "%s", op_str); |
8658dca8 BVA |
339 | seq_puts(m, ", .cmd_flags="); |
340 | blk_flags_show(m, rq->cmd_flags & ~REQ_OP_MASK, cmd_flag_name, | |
341 | ARRAY_SIZE(cmd_flag_name)); | |
342 | seq_puts(m, ", .rq_flags="); | |
343 | blk_flags_show(m, (__force unsigned int)rq->rq_flags, rqf_name, | |
344 | ARRAY_SIZE(rqf_name)); | |
ec6dcf63 | 345 | seq_printf(m, ", .state=%s", blk_mq_rq_state_name(blk_mq_rq_state(rq))); |
2836ee4b | 346 | seq_printf(m, ", .tag=%d, .internal_tag=%d", rq->tag, |
8658dca8 | 347 | rq->internal_tag); |
2836ee4b BVA |
348 | if (mq_ops->show_rq) |
349 | mq_ops->show_rq(m, rq); | |
350 | seq_puts(m, "}\n"); | |
950cd7e9 OS |
351 | return 0; |
352 | } | |
daaadb3e OS |
353 | EXPORT_SYMBOL_GPL(__blk_mq_debugfs_rq_show); |
354 | ||
355 | int blk_mq_debugfs_rq_show(struct seq_file *m, void *v) | |
356 | { | |
357 | return __blk_mq_debugfs_rq_show(m, list_entry_rq(v)); | |
358 | } | |
16b738f6 | 359 | EXPORT_SYMBOL_GPL(blk_mq_debugfs_rq_show); |
950cd7e9 OS |
360 | |
361 | static void *hctx_dispatch_start(struct seq_file *m, loff_t *pos) | |
f3bcb0e6 | 362 | __acquires(&hctx->lock) |
950cd7e9 OS |
363 | { |
364 | struct blk_mq_hw_ctx *hctx = m->private; | |
365 | ||
366 | spin_lock(&hctx->lock); | |
367 | return seq_list_start(&hctx->dispatch, *pos); | |
368 | } | |
369 | ||
370 | static void *hctx_dispatch_next(struct seq_file *m, void *v, loff_t *pos) | |
371 | { | |
372 | struct blk_mq_hw_ctx *hctx = m->private; | |
373 | ||
374 | return seq_list_next(v, &hctx->dispatch, pos); | |
375 | } | |
376 | ||
377 | static void hctx_dispatch_stop(struct seq_file *m, void *v) | |
f3bcb0e6 | 378 | __releases(&hctx->lock) |
950cd7e9 OS |
379 | { |
380 | struct blk_mq_hw_ctx *hctx = m->private; | |
381 | ||
382 | spin_unlock(&hctx->lock); | |
383 | } | |
384 | ||
385 | static const struct seq_operations hctx_dispatch_seq_ops = { | |
386 | .start = hctx_dispatch_start, | |
387 | .next = hctx_dispatch_next, | |
388 | .stop = hctx_dispatch_stop, | |
389 | .show = blk_mq_debugfs_rq_show, | |
390 | }; | |
391 | ||
2720bab5 BVA |
392 | struct show_busy_params { |
393 | struct seq_file *m; | |
394 | struct blk_mq_hw_ctx *hctx; | |
395 | }; | |
396 | ||
397 | /* | |
398 | * Note: the state of a request may change while this function is in progress, | |
7baa8572 JA |
399 | * e.g. due to a concurrent blk_mq_finish_request() call. Returns true to |
400 | * keep iterating requests. | |
2720bab5 | 401 | */ |
7baa8572 | 402 | static bool hctx_show_busy_rq(struct request *rq, void *data, bool reserved) |
2720bab5 BVA |
403 | { |
404 | const struct show_busy_params *params = data; | |
405 | ||
ea4f995e | 406 | if (rq->mq_hctx == params->hctx) |
b5fc1e8b | 407 | __blk_mq_debugfs_rq_show(params->m, rq); |
7baa8572 JA |
408 | |
409 | return true; | |
2720bab5 BVA |
410 | } |
411 | ||
412 | static int hctx_busy_show(void *data, struct seq_file *m) | |
413 | { | |
414 | struct blk_mq_hw_ctx *hctx = data; | |
415 | struct show_busy_params params = { .m = m, .hctx = hctx }; | |
416 | ||
417 | blk_mq_tagset_busy_iter(hctx->queue->tag_set, hctx_show_busy_rq, | |
418 | ¶ms); | |
419 | ||
420 | return 0; | |
421 | } | |
422 | ||
346fc108 ML |
423 | static const char *const hctx_types[] = { |
424 | [HCTX_TYPE_DEFAULT] = "default", | |
425 | [HCTX_TYPE_READ] = "read", | |
426 | [HCTX_TYPE_POLL] = "poll", | |
427 | }; | |
428 | ||
429 | static int hctx_type_show(void *data, struct seq_file *m) | |
430 | { | |
431 | struct blk_mq_hw_ctx *hctx = data; | |
432 | ||
433 | BUILD_BUG_ON(ARRAY_SIZE(hctx_types) != HCTX_MAX_TYPES); | |
434 | seq_printf(m, "%s\n", hctx_types[hctx->type]); | |
435 | return 0; | |
436 | } | |
437 | ||
f57de23a | 438 | static int hctx_ctx_map_show(void *data, struct seq_file *m) |
0bfa5288 | 439 | { |
f57de23a | 440 | struct blk_mq_hw_ctx *hctx = data; |
0bfa5288 OS |
441 | |
442 | sbitmap_bitmap_show(&hctx->ctx_map, m); | |
443 | return 0; | |
444 | } | |
445 | ||
d96b37c0 OS |
446 | static void blk_mq_debugfs_tags_show(struct seq_file *m, |
447 | struct blk_mq_tags *tags) | |
448 | { | |
449 | seq_printf(m, "nr_tags=%u\n", tags->nr_tags); | |
450 | seq_printf(m, "nr_reserved_tags=%u\n", tags->nr_reserved_tags); | |
451 | seq_printf(m, "active_queues=%d\n", | |
452 | atomic_read(&tags->active_queues)); | |
453 | ||
454 | seq_puts(m, "\nbitmap_tags:\n"); | |
ae0f1a73 | 455 | sbitmap_queue_show(&tags->bitmap_tags, m); |
d96b37c0 OS |
456 | |
457 | if (tags->nr_reserved_tags) { | |
458 | seq_puts(m, "\nbreserved_tags:\n"); | |
ae0f1a73 | 459 | sbitmap_queue_show(&tags->breserved_tags, m); |
d96b37c0 OS |
460 | } |
461 | } | |
462 | ||
f57de23a | 463 | static int hctx_tags_show(void *data, struct seq_file *m) |
d96b37c0 | 464 | { |
f57de23a | 465 | struct blk_mq_hw_ctx *hctx = data; |
d96b37c0 | 466 | struct request_queue *q = hctx->queue; |
8c0f14ea | 467 | int res; |
d96b37c0 | 468 | |
8c0f14ea BVA |
469 | res = mutex_lock_interruptible(&q->sysfs_lock); |
470 | if (res) | |
471 | goto out; | |
d96b37c0 OS |
472 | if (hctx->tags) |
473 | blk_mq_debugfs_tags_show(m, hctx->tags); | |
474 | mutex_unlock(&q->sysfs_lock); | |
475 | ||
8c0f14ea BVA |
476 | out: |
477 | return res; | |
d96b37c0 OS |
478 | } |
479 | ||
f57de23a | 480 | static int hctx_tags_bitmap_show(void *data, struct seq_file *m) |
d7e3621a | 481 | { |
f57de23a | 482 | struct blk_mq_hw_ctx *hctx = data; |
d7e3621a | 483 | struct request_queue *q = hctx->queue; |
8c0f14ea | 484 | int res; |
d7e3621a | 485 | |
8c0f14ea BVA |
486 | res = mutex_lock_interruptible(&q->sysfs_lock); |
487 | if (res) | |
488 | goto out; | |
d7e3621a | 489 | if (hctx->tags) |
ae0f1a73 | 490 | sbitmap_bitmap_show(&hctx->tags->bitmap_tags.sb, m); |
d7e3621a | 491 | mutex_unlock(&q->sysfs_lock); |
8c0f14ea BVA |
492 | |
493 | out: | |
494 | return res; | |
d7e3621a OS |
495 | } |
496 | ||
f57de23a | 497 | static int hctx_sched_tags_show(void *data, struct seq_file *m) |
d96b37c0 | 498 | { |
f57de23a | 499 | struct blk_mq_hw_ctx *hctx = data; |
d96b37c0 | 500 | struct request_queue *q = hctx->queue; |
8c0f14ea | 501 | int res; |
d96b37c0 | 502 | |
8c0f14ea BVA |
503 | res = mutex_lock_interruptible(&q->sysfs_lock); |
504 | if (res) | |
505 | goto out; | |
d96b37c0 OS |
506 | if (hctx->sched_tags) |
507 | blk_mq_debugfs_tags_show(m, hctx->sched_tags); | |
508 | mutex_unlock(&q->sysfs_lock); | |
509 | ||
8c0f14ea BVA |
510 | out: |
511 | return res; | |
d96b37c0 OS |
512 | } |
513 | ||
f57de23a | 514 | static int hctx_sched_tags_bitmap_show(void *data, struct seq_file *m) |
d7e3621a | 515 | { |
f57de23a | 516 | struct blk_mq_hw_ctx *hctx = data; |
d7e3621a | 517 | struct request_queue *q = hctx->queue; |
8c0f14ea | 518 | int res; |
d7e3621a | 519 | |
8c0f14ea BVA |
520 | res = mutex_lock_interruptible(&q->sysfs_lock); |
521 | if (res) | |
522 | goto out; | |
d7e3621a | 523 | if (hctx->sched_tags) |
ae0f1a73 | 524 | sbitmap_bitmap_show(&hctx->sched_tags->bitmap_tags.sb, m); |
d7e3621a | 525 | mutex_unlock(&q->sysfs_lock); |
8c0f14ea BVA |
526 | |
527 | out: | |
528 | return res; | |
d7e3621a OS |
529 | } |
530 | ||
f57de23a | 531 | static int hctx_run_show(void *data, struct seq_file *m) |
4a46f05e | 532 | { |
f57de23a | 533 | struct blk_mq_hw_ctx *hctx = data; |
4a46f05e OS |
534 | |
535 | seq_printf(m, "%lu\n", hctx->run); | |
536 | return 0; | |
537 | } | |
538 | ||
f57de23a OS |
539 | static ssize_t hctx_run_write(void *data, const char __user *buf, size_t count, |
540 | loff_t *ppos) | |
4a46f05e | 541 | { |
f57de23a | 542 | struct blk_mq_hw_ctx *hctx = data; |
4a46f05e OS |
543 | |
544 | hctx->run = 0; | |
545 | return count; | |
546 | } | |
547 | ||
f57de23a | 548 | static int hctx_active_show(void *data, struct seq_file *m) |
4a46f05e | 549 | { |
f57de23a | 550 | struct blk_mq_hw_ctx *hctx = data; |
4a46f05e | 551 | |
9b84c629 | 552 | seq_printf(m, "%d\n", __blk_mq_active_requests(hctx)); |
4a46f05e OS |
553 | return 0; |
554 | } | |
555 | ||
6e768717 ML |
556 | static int hctx_dispatch_busy_show(void *data, struct seq_file *m) |
557 | { | |
558 | struct blk_mq_hw_ctx *hctx = data; | |
559 | ||
560 | seq_printf(m, "%u\n", hctx->dispatch_busy); | |
561 | return 0; | |
562 | } | |
563 | ||
c16d6b5a ML |
564 | #define CTX_RQ_SEQ_OPS(name, type) \ |
565 | static void *ctx_##name##_rq_list_start(struct seq_file *m, loff_t *pos) \ | |
566 | __acquires(&ctx->lock) \ | |
567 | { \ | |
568 | struct blk_mq_ctx *ctx = m->private; \ | |
569 | \ | |
570 | spin_lock(&ctx->lock); \ | |
571 | return seq_list_start(&ctx->rq_lists[type], *pos); \ | |
572 | } \ | |
573 | \ | |
574 | static void *ctx_##name##_rq_list_next(struct seq_file *m, void *v, \ | |
575 | loff_t *pos) \ | |
576 | { \ | |
577 | struct blk_mq_ctx *ctx = m->private; \ | |
578 | \ | |
579 | return seq_list_next(v, &ctx->rq_lists[type], pos); \ | |
580 | } \ | |
581 | \ | |
582 | static void ctx_##name##_rq_list_stop(struct seq_file *m, void *v) \ | |
583 | __releases(&ctx->lock) \ | |
584 | { \ | |
585 | struct blk_mq_ctx *ctx = m->private; \ | |
586 | \ | |
587 | spin_unlock(&ctx->lock); \ | |
588 | } \ | |
589 | \ | |
590 | static const struct seq_operations ctx_##name##_rq_list_seq_ops = { \ | |
591 | .start = ctx_##name##_rq_list_start, \ | |
592 | .next = ctx_##name##_rq_list_next, \ | |
593 | .stop = ctx_##name##_rq_list_stop, \ | |
594 | .show = blk_mq_debugfs_rq_show, \ | |
595 | } | |
596 | ||
597 | CTX_RQ_SEQ_OPS(default, HCTX_TYPE_DEFAULT); | |
598 | CTX_RQ_SEQ_OPS(read, HCTX_TYPE_READ); | |
599 | CTX_RQ_SEQ_OPS(poll, HCTX_TYPE_POLL); | |
950cd7e9 | 600 | |
f57de23a OS |
601 | static int blk_mq_debugfs_show(struct seq_file *m, void *v) |
602 | { | |
603 | const struct blk_mq_debugfs_attr *attr = m->private; | |
604 | void *data = d_inode(m->file->f_path.dentry->d_parent)->i_private; | |
605 | ||
606 | return attr->show(data, m); | |
607 | } | |
608 | ||
609 | static ssize_t blk_mq_debugfs_write(struct file *file, const char __user *buf, | |
610 | size_t count, loff_t *ppos) | |
4a46f05e OS |
611 | { |
612 | struct seq_file *m = file->private_data; | |
f57de23a OS |
613 | const struct blk_mq_debugfs_attr *attr = m->private; |
614 | void *data = d_inode(file->f_path.dentry->d_parent)->i_private; | |
4a46f05e | 615 | |
6b136a24 EG |
616 | /* |
617 | * Attributes that only implement .seq_ops are read-only and 'attr' is | |
618 | * the same with 'data' in this case. | |
619 | */ | |
620 | if (attr == data || !attr->write) | |
f57de23a OS |
621 | return -EPERM; |
622 | ||
623 | return attr->write(data, buf, count, ppos); | |
624 | } | |
625 | ||
626 | static int blk_mq_debugfs_open(struct inode *inode, struct file *file) | |
627 | { | |
628 | const struct blk_mq_debugfs_attr *attr = inode->i_private; | |
629 | void *data = d_inode(file->f_path.dentry->d_parent)->i_private; | |
630 | struct seq_file *m; | |
631 | int ret; | |
632 | ||
633 | if (attr->seq_ops) { | |
634 | ret = seq_open(file, attr->seq_ops); | |
635 | if (!ret) { | |
636 | m = file->private_data; | |
637 | m->private = data; | |
638 | } | |
639 | return ret; | |
640 | } | |
641 | ||
642 | if (WARN_ON_ONCE(!attr->show)) | |
643 | return -EPERM; | |
644 | ||
645 | return single_open(file, blk_mq_debugfs_show, inode->i_private); | |
4a46f05e OS |
646 | } |
647 | ||
f57de23a OS |
648 | static int blk_mq_debugfs_release(struct inode *inode, struct file *file) |
649 | { | |
650 | const struct blk_mq_debugfs_attr *attr = inode->i_private; | |
651 | ||
652 | if (attr->show) | |
653 | return single_release(inode, file); | |
ee1e0359 CK |
654 | |
655 | return seq_release(inode, file); | |
f57de23a OS |
656 | } |
657 | ||
f8465933 | 658 | static const struct file_operations blk_mq_debugfs_fops = { |
f57de23a | 659 | .open = blk_mq_debugfs_open, |
4a46f05e | 660 | .read = seq_read, |
f57de23a | 661 | .write = blk_mq_debugfs_write, |
4a46f05e | 662 | .llseek = seq_lseek, |
f57de23a | 663 | .release = blk_mq_debugfs_release, |
4a46f05e OS |
664 | }; |
665 | ||
07e4fead | 666 | static const struct blk_mq_debugfs_attr blk_mq_debugfs_hctx_attrs[] = { |
f57de23a OS |
667 | {"state", 0400, hctx_state_show}, |
668 | {"flags", 0400, hctx_flags_show}, | |
669 | {"dispatch", 0400, .seq_ops = &hctx_dispatch_seq_ops}, | |
2720bab5 | 670 | {"busy", 0400, hctx_busy_show}, |
f57de23a OS |
671 | {"ctx_map", 0400, hctx_ctx_map_show}, |
672 | {"tags", 0400, hctx_tags_show}, | |
673 | {"tags_bitmap", 0400, hctx_tags_bitmap_show}, | |
674 | {"sched_tags", 0400, hctx_sched_tags_show}, | |
675 | {"sched_tags_bitmap", 0400, hctx_sched_tags_bitmap_show}, | |
f57de23a OS |
676 | {"run", 0600, hctx_run_show, hctx_run_write}, |
677 | {"active", 0400, hctx_active_show}, | |
6e768717 | 678 | {"dispatch_busy", 0400, hctx_dispatch_busy_show}, |
346fc108 | 679 | {"type", 0400, hctx_type_show}, |
72f2f8f6 | 680 | {}, |
07e4fead OS |
681 | }; |
682 | ||
683 | static const struct blk_mq_debugfs_attr blk_mq_debugfs_ctx_attrs[] = { | |
c16d6b5a ML |
684 | {"default_rq_list", 0400, .seq_ops = &ctx_default_rq_list_seq_ops}, |
685 | {"read_rq_list", 0400, .seq_ops = &ctx_read_rq_list_seq_ops}, | |
686 | {"poll_rq_list", 0400, .seq_ops = &ctx_poll_rq_list_seq_ops}, | |
72f2f8f6 | 687 | {}, |
07e4fead OS |
688 | }; |
689 | ||
6cfc0081 | 690 | static void debugfs_create_files(struct dentry *parent, void *data, |
9c1051aa OS |
691 | const struct blk_mq_debugfs_attr *attr) |
692 | { | |
36991ca6 | 693 | if (IS_ERR_OR_NULL(parent)) |
6cfc0081 | 694 | return; |
36991ca6 | 695 | |
9c1051aa OS |
696 | d_inode(parent)->i_private = data; |
697 | ||
6cfc0081 GKH |
698 | for (; attr->name; attr++) |
699 | debugfs_create_file(attr->name, attr->mode, parent, | |
700 | (void *)attr, &blk_mq_debugfs_fops); | |
9c1051aa OS |
701 | } |
702 | ||
6cfc0081 | 703 | void blk_mq_debugfs_register(struct request_queue *q) |
07e4fead | 704 | { |
9c1051aa OS |
705 | struct blk_mq_hw_ctx *hctx; |
706 | int i; | |
707 | ||
6cfc0081 | 708 | debugfs_create_files(q->debugfs_dir, q, blk_mq_debugfs_queue_attrs); |
07e4fead | 709 | |
9c1051aa | 710 | /* |
70e62f4b | 711 | * blk_mq_init_sched() attempted to do this already, but q->debugfs_dir |
9c1051aa OS |
712 | * didn't exist yet (because we don't know what to name the directory |
713 | * until the queue is registered to a gendisk). | |
714 | */ | |
70e62f4b OS |
715 | if (q->elevator && !q->sched_debugfs_dir) |
716 | blk_mq_debugfs_register_sched(q); | |
717 | ||
718 | /* Similarly, blk_mq_init_hctx() couldn't do this previously. */ | |
9c1051aa | 719 | queue_for_each_hw_ctx(q, hctx, i) { |
6cfc0081 GKH |
720 | if (!hctx->debugfs_dir) |
721 | blk_mq_debugfs_register_hctx(q, hctx); | |
722 | if (q->elevator && !hctx->sched_debugfs_dir) | |
723 | blk_mq_debugfs_register_sched_hctx(q, hctx); | |
9c1051aa OS |
724 | } |
725 | ||
cc56694f ML |
726 | if (q->rq_qos) { |
727 | struct rq_qos *rqos = q->rq_qos; | |
728 | ||
729 | while (rqos) { | |
730 | blk_mq_debugfs_register_rqos(rqos); | |
731 | rqos = rqos->next; | |
732 | } | |
733 | } | |
07e4fead OS |
734 | } |
735 | ||
736 | void blk_mq_debugfs_unregister(struct request_queue *q) | |
737 | { | |
d332ce09 | 738 | q->sched_debugfs_dir = NULL; |
07e4fead OS |
739 | } |
740 | ||
6cfc0081 GKH |
741 | static void blk_mq_debugfs_register_ctx(struct blk_mq_hw_ctx *hctx, |
742 | struct blk_mq_ctx *ctx) | |
07e4fead OS |
743 | { |
744 | struct dentry *ctx_dir; | |
745 | char name[20]; | |
07e4fead OS |
746 | |
747 | snprintf(name, sizeof(name), "cpu%u", ctx->cpu); | |
9c1051aa | 748 | ctx_dir = debugfs_create_dir(name, hctx->debugfs_dir); |
07e4fead | 749 | |
6cfc0081 | 750 | debugfs_create_files(ctx_dir, ctx, blk_mq_debugfs_ctx_attrs); |
07e4fead OS |
751 | } |
752 | ||
6cfc0081 GKH |
753 | void blk_mq_debugfs_register_hctx(struct request_queue *q, |
754 | struct blk_mq_hw_ctx *hctx) | |
07e4fead OS |
755 | { |
756 | struct blk_mq_ctx *ctx; | |
07e4fead OS |
757 | char name[20]; |
758 | int i; | |
759 | ||
88aabbd7 | 760 | snprintf(name, sizeof(name), "hctx%u", hctx->queue_num); |
9c1051aa | 761 | hctx->debugfs_dir = debugfs_create_dir(name, q->debugfs_dir); |
07e4fead | 762 | |
6cfc0081 | 763 | debugfs_create_files(hctx->debugfs_dir, hctx, blk_mq_debugfs_hctx_attrs); |
9c1051aa | 764 | |
6cfc0081 GKH |
765 | hctx_for_each_ctx(hctx, ctx, i) |
766 | blk_mq_debugfs_register_ctx(hctx, ctx); | |
9c1051aa OS |
767 | } |
768 | ||
769 | void blk_mq_debugfs_unregister_hctx(struct blk_mq_hw_ctx *hctx) | |
770 | { | |
771 | debugfs_remove_recursive(hctx->debugfs_dir); | |
d332ce09 | 772 | hctx->sched_debugfs_dir = NULL; |
9c1051aa | 773 | hctx->debugfs_dir = NULL; |
07e4fead OS |
774 | } |
775 | ||
6cfc0081 | 776 | void blk_mq_debugfs_register_hctxs(struct request_queue *q) |
07e4fead OS |
777 | { |
778 | struct blk_mq_hw_ctx *hctx; | |
779 | int i; | |
780 | ||
6cfc0081 GKH |
781 | queue_for_each_hw_ctx(q, hctx, i) |
782 | blk_mq_debugfs_register_hctx(q, hctx); | |
07e4fead OS |
783 | } |
784 | ||
9c1051aa | 785 | void blk_mq_debugfs_unregister_hctxs(struct request_queue *q) |
07e4fead | 786 | { |
9c1051aa OS |
787 | struct blk_mq_hw_ctx *hctx; |
788 | int i; | |
789 | ||
790 | queue_for_each_hw_ctx(q, hctx, i) | |
791 | blk_mq_debugfs_unregister_hctx(hctx); | |
07e4fead | 792 | } |
d332ce09 | 793 | |
6cfc0081 | 794 | void blk_mq_debugfs_register_sched(struct request_queue *q) |
d332ce09 OS |
795 | { |
796 | struct elevator_type *e = q->elevator->type; | |
797 | ||
7e41c3c9 GKH |
798 | /* |
799 | * If the parent directory has not been created yet, return, we will be | |
800 | * called again later on and the directory/files will be created then. | |
801 | */ | |
802 | if (!q->debugfs_dir) | |
803 | return; | |
804 | ||
d332ce09 | 805 | if (!e->queue_debugfs_attrs) |
6cfc0081 | 806 | return; |
d332ce09 OS |
807 | |
808 | q->sched_debugfs_dir = debugfs_create_dir("sched", q->debugfs_dir); | |
d332ce09 | 809 | |
6cfc0081 | 810 | debugfs_create_files(q->sched_debugfs_dir, q, e->queue_debugfs_attrs); |
d332ce09 OS |
811 | } |
812 | ||
813 | void blk_mq_debugfs_unregister_sched(struct request_queue *q) | |
814 | { | |
815 | debugfs_remove_recursive(q->sched_debugfs_dir); | |
816 | q->sched_debugfs_dir = NULL; | |
817 | } | |
818 | ||
fb44023e BVA |
819 | static const char *rq_qos_id_to_name(enum rq_qos_id id) |
820 | { | |
821 | switch (id) { | |
822 | case RQ_QOS_WBT: | |
823 | return "wbt"; | |
824 | case RQ_QOS_LATENCY: | |
825 | return "latency"; | |
826 | case RQ_QOS_COST: | |
827 | return "cost"; | |
556910e3 BVA |
828 | case RQ_QOS_IOPRIO: |
829 | return "ioprio"; | |
fb44023e BVA |
830 | } |
831 | return "unknown"; | |
832 | } | |
833 | ||
cc56694f ML |
834 | void blk_mq_debugfs_unregister_rqos(struct rq_qos *rqos) |
835 | { | |
836 | debugfs_remove_recursive(rqos->debugfs_dir); | |
837 | rqos->debugfs_dir = NULL; | |
838 | } | |
839 | ||
6cfc0081 | 840 | void blk_mq_debugfs_register_rqos(struct rq_qos *rqos) |
cc56694f ML |
841 | { |
842 | struct request_queue *q = rqos->q; | |
843 | const char *dir_name = rq_qos_id_to_name(rqos->id); | |
844 | ||
cc56694f | 845 | if (rqos->debugfs_dir || !rqos->ops->debugfs_attrs) |
6cfc0081 | 846 | return; |
cc56694f | 847 | |
6cfc0081 | 848 | if (!q->rqos_debugfs_dir) |
cc56694f ML |
849 | q->rqos_debugfs_dir = debugfs_create_dir("rqos", |
850 | q->debugfs_dir); | |
cc56694f ML |
851 | |
852 | rqos->debugfs_dir = debugfs_create_dir(dir_name, | |
853 | rqos->q->rqos_debugfs_dir); | |
cc56694f | 854 | |
6cfc0081 | 855 | debugfs_create_files(rqos->debugfs_dir, rqos, rqos->ops->debugfs_attrs); |
cc56694f ML |
856 | } |
857 | ||
858 | void blk_mq_debugfs_unregister_queue_rqos(struct request_queue *q) | |
859 | { | |
860 | debugfs_remove_recursive(q->rqos_debugfs_dir); | |
861 | q->rqos_debugfs_dir = NULL; | |
862 | } | |
863 | ||
6cfc0081 GKH |
864 | void blk_mq_debugfs_register_sched_hctx(struct request_queue *q, |
865 | struct blk_mq_hw_ctx *hctx) | |
d332ce09 OS |
866 | { |
867 | struct elevator_type *e = q->elevator->type; | |
868 | ||
1e91e28e S |
869 | /* |
870 | * If the parent debugfs directory has not been created yet, return; | |
871 | * We will be called again later on with appropriate parent debugfs | |
872 | * directory from blk_register_queue() | |
873 | */ | |
874 | if (!hctx->debugfs_dir) | |
875 | return; | |
876 | ||
d332ce09 | 877 | if (!e->hctx_debugfs_attrs) |
6cfc0081 | 878 | return; |
d332ce09 OS |
879 | |
880 | hctx->sched_debugfs_dir = debugfs_create_dir("sched", | |
881 | hctx->debugfs_dir); | |
6cfc0081 GKH |
882 | debugfs_create_files(hctx->sched_debugfs_dir, hctx, |
883 | e->hctx_debugfs_attrs); | |
d332ce09 OS |
884 | } |
885 | ||
886 | void blk_mq_debugfs_unregister_sched_hctx(struct blk_mq_hw_ctx *hctx) | |
887 | { | |
888 | debugfs_remove_recursive(hctx->sched_debugfs_dir); | |
889 | hctx->sched_debugfs_dir = NULL; | |
890 | } |