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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" |
2aa7745b | 14 | #include "blk-mq-sched.h" |
d96b37c0 | 15 | #include "blk-mq-tag.h" |
cc56694f | 16 | #include "blk-rq-qos.h" |
07e4fead | 17 | |
1209cb7f BVA |
18 | static void print_stat(struct seq_file *m, struct blk_rq_stat *stat) |
19 | { | |
20 | if (stat->nr_samples) { | |
315eb656 | 21 | seq_printf(m, "samples=%d, mean=%llu, min=%llu, max=%llu", |
1209cb7f BVA |
22 | stat->nr_samples, stat->mean, stat->min, stat->max); |
23 | } else { | |
24 | seq_puts(m, "samples=0"); | |
25 | } | |
26 | } | |
27 | ||
28 | static int queue_poll_stat_show(void *data, struct seq_file *m) | |
29 | { | |
30 | struct request_queue *q = data; | |
31 | int bucket; | |
32 | ||
18d78171 ML |
33 | if (!q->poll_stat) |
34 | return 0; | |
35 | ||
243d9f78 CK |
36 | for (bucket = 0; bucket < (BLK_MQ_POLL_STATS_BKTS / 2); bucket++) { |
37 | seq_printf(m, "read (%d Bytes): ", 1 << (9 + bucket)); | |
38 | print_stat(m, &q->poll_stat[2 * bucket]); | |
1209cb7f BVA |
39 | seq_puts(m, "\n"); |
40 | ||
243d9f78 CK |
41 | seq_printf(m, "write (%d Bytes): ", 1 << (9 + bucket)); |
42 | print_stat(m, &q->poll_stat[2 * bucket + 1]); | |
1209cb7f BVA |
43 | seq_puts(m, "\n"); |
44 | } | |
45 | return 0; | |
46 | } | |
47 | ||
48 | static void *queue_requeue_list_start(struct seq_file *m, loff_t *pos) | |
49 | __acquires(&q->requeue_lock) | |
50 | { | |
51 | struct request_queue *q = m->private; | |
52 | ||
53 | spin_lock_irq(&q->requeue_lock); | |
54 | return seq_list_start(&q->requeue_list, *pos); | |
55 | } | |
56 | ||
57 | static void *queue_requeue_list_next(struct seq_file *m, void *v, loff_t *pos) | |
58 | { | |
59 | struct request_queue *q = m->private; | |
60 | ||
61 | return seq_list_next(v, &q->requeue_list, pos); | |
62 | } | |
63 | ||
64 | static void queue_requeue_list_stop(struct seq_file *m, void *v) | |
65 | __releases(&q->requeue_lock) | |
66 | { | |
67 | struct request_queue *q = m->private; | |
68 | ||
69 | spin_unlock_irq(&q->requeue_lock); | |
70 | } | |
71 | ||
72 | static const struct seq_operations queue_requeue_list_seq_ops = { | |
73 | .start = queue_requeue_list_start, | |
74 | .next = queue_requeue_list_next, | |
75 | .stop = queue_requeue_list_stop, | |
76 | .show = blk_mq_debugfs_rq_show, | |
77 | }; | |
78 | ||
91d68905 BVA |
79 | static int blk_flags_show(struct seq_file *m, const unsigned long flags, |
80 | const char *const *flag_name, int flag_name_count) | |
81 | { | |
82 | bool sep = false; | |
83 | int i; | |
84 | ||
85 | for (i = 0; i < sizeof(flags) * BITS_PER_BYTE; i++) { | |
86 | if (!(flags & BIT(i))) | |
87 | continue; | |
88 | if (sep) | |
bec03d6b | 89 | seq_puts(m, "|"); |
91d68905 BVA |
90 | sep = true; |
91 | if (i < flag_name_count && flag_name[i]) | |
92 | seq_puts(m, flag_name[i]); | |
93 | else | |
94 | seq_printf(m, "%d", i); | |
95 | } | |
91d68905 BVA |
96 | return 0; |
97 | } | |
98 | ||
cd84a62e BVA |
99 | static int queue_pm_only_show(void *data, struct seq_file *m) |
100 | { | |
101 | struct request_queue *q = data; | |
102 | ||
103 | seq_printf(m, "%d\n", atomic_read(&q->pm_only)); | |
104 | return 0; | |
105 | } | |
106 | ||
1a435111 | 107 | #define QUEUE_FLAG_NAME(name) [QUEUE_FLAG_##name] = #name |
91d68905 | 108 | static const char *const blk_queue_flag_name[] = { |
1a435111 | 109 | QUEUE_FLAG_NAME(STOPPED), |
1a435111 | 110 | QUEUE_FLAG_NAME(DYING), |
1a435111 OS |
111 | QUEUE_FLAG_NAME(NOMERGES), |
112 | QUEUE_FLAG_NAME(SAME_COMP), | |
113 | QUEUE_FLAG_NAME(FAIL_IO), | |
1a435111 OS |
114 | QUEUE_FLAG_NAME(NONROT), |
115 | QUEUE_FLAG_NAME(IO_STAT), | |
116 | QUEUE_FLAG_NAME(DISCARD), | |
117 | QUEUE_FLAG_NAME(NOXMERGES), | |
118 | QUEUE_FLAG_NAME(ADD_RANDOM), | |
119 | QUEUE_FLAG_NAME(SECERASE), | |
120 | QUEUE_FLAG_NAME(SAME_FORCE), | |
121 | QUEUE_FLAG_NAME(DEAD), | |
122 | QUEUE_FLAG_NAME(INIT_DONE), | |
1cb039f3 | 123 | QUEUE_FLAG_NAME(STABLE_WRITES), |
1a435111 OS |
124 | QUEUE_FLAG_NAME(POLL), |
125 | QUEUE_FLAG_NAME(WC), | |
126 | QUEUE_FLAG_NAME(FUA), | |
1a435111 OS |
127 | QUEUE_FLAG_NAME(DAX), |
128 | QUEUE_FLAG_NAME(STATS), | |
1a435111 | 129 | QUEUE_FLAG_NAME(REGISTERED), |
22d53821 | 130 | QUEUE_FLAG_NAME(QUIESCED), |
bfe373f6 HT |
131 | QUEUE_FLAG_NAME(PCI_P2PDMA), |
132 | QUEUE_FLAG_NAME(ZONE_RESETALL), | |
133 | QUEUE_FLAG_NAME(RQ_ALLOC_TIME), | |
1dbdd99b | 134 | QUEUE_FLAG_NAME(HCTX_ACTIVE), |
dc304326 | 135 | QUEUE_FLAG_NAME(NOWAIT), |
91d68905 | 136 | }; |
1a435111 | 137 | #undef QUEUE_FLAG_NAME |
91d68905 | 138 | |
f57de23a | 139 | static int queue_state_show(void *data, struct seq_file *m) |
91d68905 | 140 | { |
f57de23a | 141 | struct request_queue *q = data; |
91d68905 BVA |
142 | |
143 | blk_flags_show(m, q->queue_flags, blk_queue_flag_name, | |
144 | ARRAY_SIZE(blk_queue_flag_name)); | |
fd07dc81 | 145 | seq_puts(m, "\n"); |
91d68905 BVA |
146 | return 0; |
147 | } | |
148 | ||
f57de23a OS |
149 | static ssize_t queue_state_write(void *data, const char __user *buf, |
150 | size_t count, loff_t *ppos) | |
91d68905 | 151 | { |
f57de23a | 152 | struct request_queue *q = data; |
71b90511 | 153 | char opbuf[16] = { }, *op; |
91d68905 | 154 | |
18d4d7d0 BVA |
155 | /* |
156 | * The "state" attribute is removed after blk_cleanup_queue() has called | |
157 | * blk_mq_free_queue(). Return if QUEUE_FLAG_DEAD has been set to avoid | |
158 | * triggering a use-after-free. | |
159 | */ | |
160 | if (blk_queue_dead(q)) | |
161 | return -ENOENT; | |
162 | ||
71b90511 | 163 | if (count >= sizeof(opbuf)) { |
c7e4145a OS |
164 | pr_err("%s: operation too long\n", __func__); |
165 | goto inval; | |
166 | } | |
167 | ||
71b90511 | 168 | if (copy_from_user(opbuf, buf, count)) |
91d68905 | 169 | return -EFAULT; |
71b90511 | 170 | op = strstrip(opbuf); |
91d68905 BVA |
171 | if (strcmp(op, "run") == 0) { |
172 | blk_mq_run_hw_queues(q, true); | |
173 | } else if (strcmp(op, "start") == 0) { | |
174 | blk_mq_start_stopped_hw_queues(q, true); | |
edea55ab BVA |
175 | } else if (strcmp(op, "kick") == 0) { |
176 | blk_mq_kick_requeue_list(q); | |
91d68905 | 177 | } else { |
c7e4145a OS |
178 | pr_err("%s: unsupported operation '%s'\n", __func__, op); |
179 | inval: | |
edea55ab | 180 | pr_err("%s: use 'run', 'start' or 'kick'\n", __func__); |
91d68905 BVA |
181 | return -EINVAL; |
182 | } | |
c7e4145a | 183 | return count; |
91d68905 BVA |
184 | } |
185 | ||
f793dfd3 JA |
186 | static int queue_write_hint_show(void *data, struct seq_file *m) |
187 | { | |
188 | struct request_queue *q = data; | |
189 | int i; | |
190 | ||
191 | for (i = 0; i < BLK_MAX_WRITE_HINTS; i++) | |
192 | seq_printf(m, "hint%d: %llu\n", i, q->write_hints[i]); | |
193 | ||
194 | return 0; | |
195 | } | |
196 | ||
197 | static ssize_t queue_write_hint_store(void *data, const char __user *buf, | |
198 | size_t count, loff_t *ppos) | |
199 | { | |
200 | struct request_queue *q = data; | |
201 | int i; | |
202 | ||
203 | for (i = 0; i < BLK_MAX_WRITE_HINTS; i++) | |
204 | q->write_hints[i] = 0; | |
205 | ||
206 | return count; | |
207 | } | |
208 | ||
1209cb7f BVA |
209 | static const struct blk_mq_debugfs_attr blk_mq_debugfs_queue_attrs[] = { |
210 | { "poll_stat", 0400, queue_poll_stat_show }, | |
211 | { "requeue_list", 0400, .seq_ops = &queue_requeue_list_seq_ops }, | |
cd84a62e | 212 | { "pm_only", 0600, queue_pm_only_show, NULL }, |
1209cb7f BVA |
213 | { "state", 0600, queue_state_show, queue_state_write }, |
214 | { "write_hints", 0600, queue_write_hint_show, queue_write_hint_store }, | |
18bc4230 | 215 | { "zone_wlock", 0400, queue_zone_wlock_show, NULL }, |
1209cb7f BVA |
216 | { }, |
217 | }; | |
34dbad5d | 218 | |
1a435111 | 219 | #define HCTX_STATE_NAME(name) [BLK_MQ_S_##name] = #name |
f5c0b091 | 220 | static const char *const hctx_state_name[] = { |
1a435111 OS |
221 | HCTX_STATE_NAME(STOPPED), |
222 | HCTX_STATE_NAME(TAG_ACTIVE), | |
223 | HCTX_STATE_NAME(SCHED_RESTART), | |
bf0beec0 | 224 | HCTX_STATE_NAME(INACTIVE), |
f5c0b091 | 225 | }; |
1a435111 OS |
226 | #undef HCTX_STATE_NAME |
227 | ||
f57de23a | 228 | static int hctx_state_show(void *data, struct seq_file *m) |
9abb2ad2 | 229 | { |
f57de23a | 230 | struct blk_mq_hw_ctx *hctx = data; |
9abb2ad2 | 231 | |
f5c0b091 BVA |
232 | blk_flags_show(m, hctx->state, hctx_state_name, |
233 | ARRAY_SIZE(hctx_state_name)); | |
fd07dc81 | 234 | seq_puts(m, "\n"); |
9abb2ad2 OS |
235 | return 0; |
236 | } | |
237 | ||
1a435111 | 238 | #define BLK_TAG_ALLOC_NAME(name) [BLK_TAG_ALLOC_##name] = #name |
f5c0b091 | 239 | static const char *const alloc_policy_name[] = { |
1a435111 OS |
240 | BLK_TAG_ALLOC_NAME(FIFO), |
241 | BLK_TAG_ALLOC_NAME(RR), | |
f5c0b091 | 242 | }; |
1a435111 | 243 | #undef BLK_TAG_ALLOC_NAME |
f5c0b091 | 244 | |
1a435111 | 245 | #define HCTX_FLAG_NAME(name) [ilog2(BLK_MQ_F_##name)] = #name |
f5c0b091 | 246 | static const char *const hctx_flag_name[] = { |
1a435111 | 247 | HCTX_FLAG_NAME(SHOULD_MERGE), |
51db1c37 | 248 | HCTX_FLAG_NAME(TAG_QUEUE_SHARED), |
1a435111 OS |
249 | HCTX_FLAG_NAME(BLOCKING), |
250 | HCTX_FLAG_NAME(NO_SCHED), | |
bf0beec0 | 251 | HCTX_FLAG_NAME(STACKING), |
02f938e9 | 252 | HCTX_FLAG_NAME(TAG_HCTX_SHARED), |
f5c0b091 | 253 | }; |
1a435111 | 254 | #undef HCTX_FLAG_NAME |
f5c0b091 | 255 | |
f57de23a | 256 | static int hctx_flags_show(void *data, struct seq_file *m) |
9abb2ad2 | 257 | { |
f57de23a | 258 | struct blk_mq_hw_ctx *hctx = data; |
f5c0b091 | 259 | const int alloc_policy = BLK_MQ_FLAG_TO_ALLOC_POLICY(hctx->flags); |
9abb2ad2 | 260 | |
f5c0b091 BVA |
261 | seq_puts(m, "alloc_policy="); |
262 | if (alloc_policy < ARRAY_SIZE(alloc_policy_name) && | |
263 | alloc_policy_name[alloc_policy]) | |
264 | seq_puts(m, alloc_policy_name[alloc_policy]); | |
265 | else | |
266 | seq_printf(m, "%d", alloc_policy); | |
267 | seq_puts(m, " "); | |
268 | blk_flags_show(m, | |
269 | hctx->flags ^ BLK_ALLOC_POLICY_TO_MQ_FLAG(alloc_policy), | |
270 | hctx_flag_name, ARRAY_SIZE(hctx_flag_name)); | |
fd07dc81 | 271 | seq_puts(m, "\n"); |
9abb2ad2 OS |
272 | return 0; |
273 | } | |
274 | ||
1a435111 | 275 | #define CMD_FLAG_NAME(name) [__REQ_##name] = #name |
8658dca8 | 276 | static const char *const cmd_flag_name[] = { |
1a435111 OS |
277 | CMD_FLAG_NAME(FAILFAST_DEV), |
278 | CMD_FLAG_NAME(FAILFAST_TRANSPORT), | |
279 | CMD_FLAG_NAME(FAILFAST_DRIVER), | |
280 | CMD_FLAG_NAME(SYNC), | |
281 | CMD_FLAG_NAME(META), | |
282 | CMD_FLAG_NAME(PRIO), | |
283 | CMD_FLAG_NAME(NOMERGE), | |
284 | CMD_FLAG_NAME(IDLE), | |
285 | CMD_FLAG_NAME(INTEGRITY), | |
286 | CMD_FLAG_NAME(FUA), | |
287 | CMD_FLAG_NAME(PREFLUSH), | |
288 | CMD_FLAG_NAME(RAHEAD), | |
289 | CMD_FLAG_NAME(BACKGROUND), | |
22d53821 | 290 | CMD_FLAG_NAME(NOWAIT), |
1c26010c | 291 | CMD_FLAG_NAME(NOUNMAP), |
6ce913fe | 292 | CMD_FLAG_NAME(POLLED), |
8658dca8 | 293 | }; |
1a435111 | 294 | #undef CMD_FLAG_NAME |
8658dca8 | 295 | |
1a435111 | 296 | #define RQF_NAME(name) [ilog2((__force u32)RQF_##name)] = #name |
8658dca8 | 297 | static const char *const rqf_name[] = { |
85ba3eff | 298 | RQF_NAME(STARTED), |
1a435111 OS |
299 | RQF_NAME(SOFTBARRIER), |
300 | RQF_NAME(FLUSH_SEQ), | |
301 | RQF_NAME(MIXED_MERGE), | |
302 | RQF_NAME(MQ_INFLIGHT), | |
303 | RQF_NAME(DONTPREP), | |
1a435111 OS |
304 | RQF_NAME(FAILED), |
305 | RQF_NAME(QUIET), | |
306 | RQF_NAME(ELVPRIV), | |
307 | RQF_NAME(IO_STAT), | |
1a435111 OS |
308 | RQF_NAME(PM), |
309 | RQF_NAME(HASHED), | |
310 | RQF_NAME(STATS), | |
311 | RQF_NAME(SPECIAL_PAYLOAD), | |
5d75d3f2 | 312 | RQF_NAME(ZONE_WRITE_LOCKED), |
76a86f9d | 313 | RQF_NAME(MQ_POLL_SLEPT), |
62ba0c00 | 314 | RQF_NAME(ELV), |
8658dca8 | 315 | }; |
1a435111 | 316 | #undef RQF_NAME |
8658dca8 | 317 | |
ec6dcf63 BVA |
318 | static const char *const blk_mq_rq_state_name_array[] = { |
319 | [MQ_RQ_IDLE] = "idle", | |
320 | [MQ_RQ_IN_FLIGHT] = "in_flight", | |
321 | [MQ_RQ_COMPLETE] = "complete", | |
322 | }; | |
323 | ||
324 | static const char *blk_mq_rq_state_name(enum mq_rq_state rq_state) | |
325 | { | |
a1e79188 | 326 | if (WARN_ON_ONCE((unsigned int)rq_state >= |
ec6dcf63 BVA |
327 | ARRAY_SIZE(blk_mq_rq_state_name_array))) |
328 | return "(?)"; | |
329 | return blk_mq_rq_state_name_array[rq_state]; | |
330 | } | |
331 | ||
daaadb3e | 332 | int __blk_mq_debugfs_rq_show(struct seq_file *m, struct request *rq) |
950cd7e9 | 333 | { |
2836ee4b | 334 | const struct blk_mq_ops *const mq_ops = rq->q->mq_ops; |
f9bc64a0 | 335 | const unsigned int op = req_op(rq); |
874c893b | 336 | const char *op_str = blk_op_str(op); |
950cd7e9 | 337 | |
8658dca8 | 338 | seq_printf(m, "%p {.op=", rq); |
874c893b | 339 | if (strcmp(op_str, "UNKNOWN") == 0) |
3f6d385f | 340 | seq_printf(m, "%u", op); |
8658dca8 | 341 | else |
874c893b | 342 | seq_printf(m, "%s", op_str); |
8658dca8 BVA |
343 | seq_puts(m, ", .cmd_flags="); |
344 | blk_flags_show(m, rq->cmd_flags & ~REQ_OP_MASK, cmd_flag_name, | |
345 | ARRAY_SIZE(cmd_flag_name)); | |
346 | seq_puts(m, ", .rq_flags="); | |
347 | blk_flags_show(m, (__force unsigned int)rq->rq_flags, rqf_name, | |
348 | ARRAY_SIZE(rqf_name)); | |
ec6dcf63 | 349 | seq_printf(m, ", .state=%s", blk_mq_rq_state_name(blk_mq_rq_state(rq))); |
2836ee4b | 350 | seq_printf(m, ", .tag=%d, .internal_tag=%d", rq->tag, |
8658dca8 | 351 | rq->internal_tag); |
2836ee4b BVA |
352 | if (mq_ops->show_rq) |
353 | mq_ops->show_rq(m, rq); | |
354 | seq_puts(m, "}\n"); | |
950cd7e9 OS |
355 | return 0; |
356 | } | |
daaadb3e OS |
357 | EXPORT_SYMBOL_GPL(__blk_mq_debugfs_rq_show); |
358 | ||
359 | int blk_mq_debugfs_rq_show(struct seq_file *m, void *v) | |
360 | { | |
361 | return __blk_mq_debugfs_rq_show(m, list_entry_rq(v)); | |
362 | } | |
16b738f6 | 363 | EXPORT_SYMBOL_GPL(blk_mq_debugfs_rq_show); |
950cd7e9 OS |
364 | |
365 | static void *hctx_dispatch_start(struct seq_file *m, loff_t *pos) | |
f3bcb0e6 | 366 | __acquires(&hctx->lock) |
950cd7e9 OS |
367 | { |
368 | struct blk_mq_hw_ctx *hctx = m->private; | |
369 | ||
370 | spin_lock(&hctx->lock); | |
371 | return seq_list_start(&hctx->dispatch, *pos); | |
372 | } | |
373 | ||
374 | static void *hctx_dispatch_next(struct seq_file *m, void *v, loff_t *pos) | |
375 | { | |
376 | struct blk_mq_hw_ctx *hctx = m->private; | |
377 | ||
378 | return seq_list_next(v, &hctx->dispatch, pos); | |
379 | } | |
380 | ||
381 | static void hctx_dispatch_stop(struct seq_file *m, void *v) | |
f3bcb0e6 | 382 | __releases(&hctx->lock) |
950cd7e9 OS |
383 | { |
384 | struct blk_mq_hw_ctx *hctx = m->private; | |
385 | ||
386 | spin_unlock(&hctx->lock); | |
387 | } | |
388 | ||
389 | static const struct seq_operations hctx_dispatch_seq_ops = { | |
390 | .start = hctx_dispatch_start, | |
391 | .next = hctx_dispatch_next, | |
392 | .stop = hctx_dispatch_stop, | |
393 | .show = blk_mq_debugfs_rq_show, | |
394 | }; | |
395 | ||
2720bab5 BVA |
396 | struct show_busy_params { |
397 | struct seq_file *m; | |
398 | struct blk_mq_hw_ctx *hctx; | |
399 | }; | |
400 | ||
401 | /* | |
402 | * Note: the state of a request may change while this function is in progress, | |
7baa8572 JA |
403 | * e.g. due to a concurrent blk_mq_finish_request() call. Returns true to |
404 | * keep iterating requests. | |
2720bab5 | 405 | */ |
7baa8572 | 406 | static bool hctx_show_busy_rq(struct request *rq, void *data, bool reserved) |
2720bab5 BVA |
407 | { |
408 | const struct show_busy_params *params = data; | |
409 | ||
ea4f995e | 410 | if (rq->mq_hctx == params->hctx) |
b5fc1e8b | 411 | __blk_mq_debugfs_rq_show(params->m, rq); |
7baa8572 JA |
412 | |
413 | return true; | |
2720bab5 BVA |
414 | } |
415 | ||
416 | static int hctx_busy_show(void *data, struct seq_file *m) | |
417 | { | |
418 | struct blk_mq_hw_ctx *hctx = data; | |
419 | struct show_busy_params params = { .m = m, .hctx = hctx }; | |
420 | ||
421 | blk_mq_tagset_busy_iter(hctx->queue->tag_set, hctx_show_busy_rq, | |
422 | ¶ms); | |
423 | ||
424 | return 0; | |
425 | } | |
426 | ||
346fc108 ML |
427 | static const char *const hctx_types[] = { |
428 | [HCTX_TYPE_DEFAULT] = "default", | |
429 | [HCTX_TYPE_READ] = "read", | |
430 | [HCTX_TYPE_POLL] = "poll", | |
431 | }; | |
432 | ||
433 | static int hctx_type_show(void *data, struct seq_file *m) | |
434 | { | |
435 | struct blk_mq_hw_ctx *hctx = data; | |
436 | ||
437 | BUILD_BUG_ON(ARRAY_SIZE(hctx_types) != HCTX_MAX_TYPES); | |
438 | seq_printf(m, "%s\n", hctx_types[hctx->type]); | |
439 | return 0; | |
440 | } | |
441 | ||
f57de23a | 442 | static int hctx_ctx_map_show(void *data, struct seq_file *m) |
0bfa5288 | 443 | { |
f57de23a | 444 | struct blk_mq_hw_ctx *hctx = data; |
0bfa5288 OS |
445 | |
446 | sbitmap_bitmap_show(&hctx->ctx_map, m); | |
447 | return 0; | |
448 | } | |
449 | ||
d96b37c0 OS |
450 | static void blk_mq_debugfs_tags_show(struct seq_file *m, |
451 | struct blk_mq_tags *tags) | |
452 | { | |
453 | seq_printf(m, "nr_tags=%u\n", tags->nr_tags); | |
454 | seq_printf(m, "nr_reserved_tags=%u\n", tags->nr_reserved_tags); | |
455 | seq_printf(m, "active_queues=%d\n", | |
456 | atomic_read(&tags->active_queues)); | |
457 | ||
458 | seq_puts(m, "\nbitmap_tags:\n"); | |
ae0f1a73 | 459 | sbitmap_queue_show(&tags->bitmap_tags, m); |
d96b37c0 OS |
460 | |
461 | if (tags->nr_reserved_tags) { | |
462 | seq_puts(m, "\nbreserved_tags:\n"); | |
ae0f1a73 | 463 | sbitmap_queue_show(&tags->breserved_tags, m); |
d96b37c0 OS |
464 | } |
465 | } | |
466 | ||
f57de23a | 467 | static int hctx_tags_show(void *data, struct seq_file *m) |
d96b37c0 | 468 | { |
f57de23a | 469 | struct blk_mq_hw_ctx *hctx = data; |
d96b37c0 | 470 | struct request_queue *q = hctx->queue; |
8c0f14ea | 471 | int res; |
d96b37c0 | 472 | |
8c0f14ea BVA |
473 | res = mutex_lock_interruptible(&q->sysfs_lock); |
474 | if (res) | |
475 | goto out; | |
d96b37c0 OS |
476 | if (hctx->tags) |
477 | blk_mq_debugfs_tags_show(m, hctx->tags); | |
478 | mutex_unlock(&q->sysfs_lock); | |
479 | ||
8c0f14ea BVA |
480 | out: |
481 | return res; | |
d96b37c0 OS |
482 | } |
483 | ||
f57de23a | 484 | static int hctx_tags_bitmap_show(void *data, struct seq_file *m) |
d7e3621a | 485 | { |
f57de23a | 486 | struct blk_mq_hw_ctx *hctx = data; |
d7e3621a | 487 | struct request_queue *q = hctx->queue; |
8c0f14ea | 488 | int res; |
d7e3621a | 489 | |
8c0f14ea BVA |
490 | res = mutex_lock_interruptible(&q->sysfs_lock); |
491 | if (res) | |
492 | goto out; | |
d7e3621a | 493 | if (hctx->tags) |
ae0f1a73 | 494 | sbitmap_bitmap_show(&hctx->tags->bitmap_tags.sb, m); |
d7e3621a | 495 | mutex_unlock(&q->sysfs_lock); |
8c0f14ea BVA |
496 | |
497 | out: | |
498 | return res; | |
d7e3621a OS |
499 | } |
500 | ||
f57de23a | 501 | static int hctx_sched_tags_show(void *data, struct seq_file *m) |
d96b37c0 | 502 | { |
f57de23a | 503 | struct blk_mq_hw_ctx *hctx = data; |
d96b37c0 | 504 | struct request_queue *q = hctx->queue; |
8c0f14ea | 505 | int res; |
d96b37c0 | 506 | |
8c0f14ea BVA |
507 | res = mutex_lock_interruptible(&q->sysfs_lock); |
508 | if (res) | |
509 | goto out; | |
d96b37c0 OS |
510 | if (hctx->sched_tags) |
511 | blk_mq_debugfs_tags_show(m, hctx->sched_tags); | |
512 | mutex_unlock(&q->sysfs_lock); | |
513 | ||
8c0f14ea BVA |
514 | out: |
515 | return res; | |
d96b37c0 OS |
516 | } |
517 | ||
f57de23a | 518 | static int hctx_sched_tags_bitmap_show(void *data, struct seq_file *m) |
d7e3621a | 519 | { |
f57de23a | 520 | struct blk_mq_hw_ctx *hctx = data; |
d7e3621a | 521 | struct request_queue *q = hctx->queue; |
8c0f14ea | 522 | int res; |
d7e3621a | 523 | |
8c0f14ea BVA |
524 | res = mutex_lock_interruptible(&q->sysfs_lock); |
525 | if (res) | |
526 | goto out; | |
d7e3621a | 527 | if (hctx->sched_tags) |
ae0f1a73 | 528 | sbitmap_bitmap_show(&hctx->sched_tags->bitmap_tags.sb, m); |
d7e3621a | 529 | mutex_unlock(&q->sysfs_lock); |
8c0f14ea BVA |
530 | |
531 | out: | |
532 | return res; | |
d7e3621a OS |
533 | } |
534 | ||
f57de23a | 535 | static int hctx_run_show(void *data, struct seq_file *m) |
4a46f05e | 536 | { |
f57de23a | 537 | struct blk_mq_hw_ctx *hctx = data; |
4a46f05e OS |
538 | |
539 | seq_printf(m, "%lu\n", hctx->run); | |
540 | return 0; | |
541 | } | |
542 | ||
f57de23a OS |
543 | static ssize_t hctx_run_write(void *data, const char __user *buf, size_t count, |
544 | loff_t *ppos) | |
4a46f05e | 545 | { |
f57de23a | 546 | struct blk_mq_hw_ctx *hctx = data; |
4a46f05e OS |
547 | |
548 | hctx->run = 0; | |
549 | return count; | |
550 | } | |
551 | ||
f57de23a | 552 | static int hctx_active_show(void *data, struct seq_file *m) |
4a46f05e | 553 | { |
f57de23a | 554 | struct blk_mq_hw_ctx *hctx = data; |
4a46f05e | 555 | |
9b84c629 | 556 | seq_printf(m, "%d\n", __blk_mq_active_requests(hctx)); |
4a46f05e OS |
557 | return 0; |
558 | } | |
559 | ||
6e768717 ML |
560 | static int hctx_dispatch_busy_show(void *data, struct seq_file *m) |
561 | { | |
562 | struct blk_mq_hw_ctx *hctx = data; | |
563 | ||
564 | seq_printf(m, "%u\n", hctx->dispatch_busy); | |
565 | return 0; | |
566 | } | |
567 | ||
c16d6b5a ML |
568 | #define CTX_RQ_SEQ_OPS(name, type) \ |
569 | static void *ctx_##name##_rq_list_start(struct seq_file *m, loff_t *pos) \ | |
570 | __acquires(&ctx->lock) \ | |
571 | { \ | |
572 | struct blk_mq_ctx *ctx = m->private; \ | |
573 | \ | |
574 | spin_lock(&ctx->lock); \ | |
575 | return seq_list_start(&ctx->rq_lists[type], *pos); \ | |
576 | } \ | |
577 | \ | |
578 | static void *ctx_##name##_rq_list_next(struct seq_file *m, void *v, \ | |
579 | loff_t *pos) \ | |
580 | { \ | |
581 | struct blk_mq_ctx *ctx = m->private; \ | |
582 | \ | |
583 | return seq_list_next(v, &ctx->rq_lists[type], pos); \ | |
584 | } \ | |
585 | \ | |
586 | static void ctx_##name##_rq_list_stop(struct seq_file *m, void *v) \ | |
587 | __releases(&ctx->lock) \ | |
588 | { \ | |
589 | struct blk_mq_ctx *ctx = m->private; \ | |
590 | \ | |
591 | spin_unlock(&ctx->lock); \ | |
592 | } \ | |
593 | \ | |
594 | static const struct seq_operations ctx_##name##_rq_list_seq_ops = { \ | |
595 | .start = ctx_##name##_rq_list_start, \ | |
596 | .next = ctx_##name##_rq_list_next, \ | |
597 | .stop = ctx_##name##_rq_list_stop, \ | |
598 | .show = blk_mq_debugfs_rq_show, \ | |
599 | } | |
600 | ||
601 | CTX_RQ_SEQ_OPS(default, HCTX_TYPE_DEFAULT); | |
602 | CTX_RQ_SEQ_OPS(read, HCTX_TYPE_READ); | |
603 | CTX_RQ_SEQ_OPS(poll, HCTX_TYPE_POLL); | |
950cd7e9 | 604 | |
f57de23a OS |
605 | static int blk_mq_debugfs_show(struct seq_file *m, void *v) |
606 | { | |
607 | const struct blk_mq_debugfs_attr *attr = m->private; | |
608 | void *data = d_inode(m->file->f_path.dentry->d_parent)->i_private; | |
609 | ||
610 | return attr->show(data, m); | |
611 | } | |
612 | ||
613 | static ssize_t blk_mq_debugfs_write(struct file *file, const char __user *buf, | |
614 | size_t count, loff_t *ppos) | |
4a46f05e OS |
615 | { |
616 | struct seq_file *m = file->private_data; | |
f57de23a OS |
617 | const struct blk_mq_debugfs_attr *attr = m->private; |
618 | void *data = d_inode(file->f_path.dentry->d_parent)->i_private; | |
4a46f05e | 619 | |
6b136a24 EG |
620 | /* |
621 | * Attributes that only implement .seq_ops are read-only and 'attr' is | |
622 | * the same with 'data' in this case. | |
623 | */ | |
624 | if (attr == data || !attr->write) | |
f57de23a OS |
625 | return -EPERM; |
626 | ||
627 | return attr->write(data, buf, count, ppos); | |
628 | } | |
629 | ||
630 | static int blk_mq_debugfs_open(struct inode *inode, struct file *file) | |
631 | { | |
632 | const struct blk_mq_debugfs_attr *attr = inode->i_private; | |
633 | void *data = d_inode(file->f_path.dentry->d_parent)->i_private; | |
634 | struct seq_file *m; | |
635 | int ret; | |
636 | ||
637 | if (attr->seq_ops) { | |
638 | ret = seq_open(file, attr->seq_ops); | |
639 | if (!ret) { | |
640 | m = file->private_data; | |
641 | m->private = data; | |
642 | } | |
643 | return ret; | |
644 | } | |
645 | ||
646 | if (WARN_ON_ONCE(!attr->show)) | |
647 | return -EPERM; | |
648 | ||
649 | return single_open(file, blk_mq_debugfs_show, inode->i_private); | |
4a46f05e OS |
650 | } |
651 | ||
f57de23a OS |
652 | static int blk_mq_debugfs_release(struct inode *inode, struct file *file) |
653 | { | |
654 | const struct blk_mq_debugfs_attr *attr = inode->i_private; | |
655 | ||
656 | if (attr->show) | |
657 | return single_release(inode, file); | |
ee1e0359 CK |
658 | |
659 | return seq_release(inode, file); | |
f57de23a OS |
660 | } |
661 | ||
f8465933 | 662 | static const struct file_operations blk_mq_debugfs_fops = { |
f57de23a | 663 | .open = blk_mq_debugfs_open, |
4a46f05e | 664 | .read = seq_read, |
f57de23a | 665 | .write = blk_mq_debugfs_write, |
4a46f05e | 666 | .llseek = seq_lseek, |
f57de23a | 667 | .release = blk_mq_debugfs_release, |
4a46f05e OS |
668 | }; |
669 | ||
07e4fead | 670 | static const struct blk_mq_debugfs_attr blk_mq_debugfs_hctx_attrs[] = { |
f57de23a OS |
671 | {"state", 0400, hctx_state_show}, |
672 | {"flags", 0400, hctx_flags_show}, | |
673 | {"dispatch", 0400, .seq_ops = &hctx_dispatch_seq_ops}, | |
2720bab5 | 674 | {"busy", 0400, hctx_busy_show}, |
f57de23a OS |
675 | {"ctx_map", 0400, hctx_ctx_map_show}, |
676 | {"tags", 0400, hctx_tags_show}, | |
677 | {"tags_bitmap", 0400, hctx_tags_bitmap_show}, | |
678 | {"sched_tags", 0400, hctx_sched_tags_show}, | |
679 | {"sched_tags_bitmap", 0400, hctx_sched_tags_bitmap_show}, | |
f57de23a OS |
680 | {"run", 0600, hctx_run_show, hctx_run_write}, |
681 | {"active", 0400, hctx_active_show}, | |
6e768717 | 682 | {"dispatch_busy", 0400, hctx_dispatch_busy_show}, |
346fc108 | 683 | {"type", 0400, hctx_type_show}, |
72f2f8f6 | 684 | {}, |
07e4fead OS |
685 | }; |
686 | ||
687 | static const struct blk_mq_debugfs_attr blk_mq_debugfs_ctx_attrs[] = { | |
c16d6b5a ML |
688 | {"default_rq_list", 0400, .seq_ops = &ctx_default_rq_list_seq_ops}, |
689 | {"read_rq_list", 0400, .seq_ops = &ctx_read_rq_list_seq_ops}, | |
690 | {"poll_rq_list", 0400, .seq_ops = &ctx_poll_rq_list_seq_ops}, | |
72f2f8f6 | 691 | {}, |
07e4fead OS |
692 | }; |
693 | ||
6cfc0081 | 694 | static void debugfs_create_files(struct dentry *parent, void *data, |
9c1051aa OS |
695 | const struct blk_mq_debugfs_attr *attr) |
696 | { | |
36991ca6 | 697 | if (IS_ERR_OR_NULL(parent)) |
6cfc0081 | 698 | return; |
36991ca6 | 699 | |
9c1051aa OS |
700 | d_inode(parent)->i_private = data; |
701 | ||
6cfc0081 GKH |
702 | for (; attr->name; attr++) |
703 | debugfs_create_file(attr->name, attr->mode, parent, | |
704 | (void *)attr, &blk_mq_debugfs_fops); | |
9c1051aa OS |
705 | } |
706 | ||
6cfc0081 | 707 | void blk_mq_debugfs_register(struct request_queue *q) |
07e4fead | 708 | { |
9c1051aa OS |
709 | struct blk_mq_hw_ctx *hctx; |
710 | int i; | |
711 | ||
6cfc0081 | 712 | debugfs_create_files(q->debugfs_dir, q, blk_mq_debugfs_queue_attrs); |
07e4fead | 713 | |
9c1051aa | 714 | /* |
70e62f4b | 715 | * blk_mq_init_sched() attempted to do this already, but q->debugfs_dir |
9c1051aa OS |
716 | * didn't exist yet (because we don't know what to name the directory |
717 | * until the queue is registered to a gendisk). | |
718 | */ | |
70e62f4b OS |
719 | if (q->elevator && !q->sched_debugfs_dir) |
720 | blk_mq_debugfs_register_sched(q); | |
721 | ||
722 | /* Similarly, blk_mq_init_hctx() couldn't do this previously. */ | |
9c1051aa | 723 | queue_for_each_hw_ctx(q, hctx, i) { |
6cfc0081 GKH |
724 | if (!hctx->debugfs_dir) |
725 | blk_mq_debugfs_register_hctx(q, hctx); | |
726 | if (q->elevator && !hctx->sched_debugfs_dir) | |
727 | blk_mq_debugfs_register_sched_hctx(q, hctx); | |
9c1051aa OS |
728 | } |
729 | ||
cc56694f ML |
730 | if (q->rq_qos) { |
731 | struct rq_qos *rqos = q->rq_qos; | |
732 | ||
733 | while (rqos) { | |
734 | blk_mq_debugfs_register_rqos(rqos); | |
735 | rqos = rqos->next; | |
736 | } | |
737 | } | |
07e4fead OS |
738 | } |
739 | ||
740 | void blk_mq_debugfs_unregister(struct request_queue *q) | |
741 | { | |
d332ce09 | 742 | q->sched_debugfs_dir = NULL; |
07e4fead OS |
743 | } |
744 | ||
6cfc0081 GKH |
745 | static void blk_mq_debugfs_register_ctx(struct blk_mq_hw_ctx *hctx, |
746 | struct blk_mq_ctx *ctx) | |
07e4fead OS |
747 | { |
748 | struct dentry *ctx_dir; | |
749 | char name[20]; | |
07e4fead OS |
750 | |
751 | snprintf(name, sizeof(name), "cpu%u", ctx->cpu); | |
9c1051aa | 752 | ctx_dir = debugfs_create_dir(name, hctx->debugfs_dir); |
07e4fead | 753 | |
6cfc0081 | 754 | debugfs_create_files(ctx_dir, ctx, blk_mq_debugfs_ctx_attrs); |
07e4fead OS |
755 | } |
756 | ||
6cfc0081 GKH |
757 | void blk_mq_debugfs_register_hctx(struct request_queue *q, |
758 | struct blk_mq_hw_ctx *hctx) | |
07e4fead OS |
759 | { |
760 | struct blk_mq_ctx *ctx; | |
07e4fead OS |
761 | char name[20]; |
762 | int i; | |
763 | ||
88aabbd7 | 764 | snprintf(name, sizeof(name), "hctx%u", hctx->queue_num); |
9c1051aa | 765 | hctx->debugfs_dir = debugfs_create_dir(name, q->debugfs_dir); |
07e4fead | 766 | |
6cfc0081 | 767 | debugfs_create_files(hctx->debugfs_dir, hctx, blk_mq_debugfs_hctx_attrs); |
9c1051aa | 768 | |
6cfc0081 GKH |
769 | hctx_for_each_ctx(hctx, ctx, i) |
770 | blk_mq_debugfs_register_ctx(hctx, ctx); | |
9c1051aa OS |
771 | } |
772 | ||
773 | void blk_mq_debugfs_unregister_hctx(struct blk_mq_hw_ctx *hctx) | |
774 | { | |
775 | debugfs_remove_recursive(hctx->debugfs_dir); | |
d332ce09 | 776 | hctx->sched_debugfs_dir = NULL; |
9c1051aa | 777 | hctx->debugfs_dir = NULL; |
07e4fead OS |
778 | } |
779 | ||
6cfc0081 | 780 | void blk_mq_debugfs_register_hctxs(struct request_queue *q) |
07e4fead OS |
781 | { |
782 | struct blk_mq_hw_ctx *hctx; | |
783 | int i; | |
784 | ||
6cfc0081 GKH |
785 | queue_for_each_hw_ctx(q, hctx, i) |
786 | blk_mq_debugfs_register_hctx(q, hctx); | |
07e4fead OS |
787 | } |
788 | ||
9c1051aa | 789 | void blk_mq_debugfs_unregister_hctxs(struct request_queue *q) |
07e4fead | 790 | { |
9c1051aa OS |
791 | struct blk_mq_hw_ctx *hctx; |
792 | int i; | |
793 | ||
794 | queue_for_each_hw_ctx(q, hctx, i) | |
795 | blk_mq_debugfs_unregister_hctx(hctx); | |
07e4fead | 796 | } |
d332ce09 | 797 | |
6cfc0081 | 798 | void blk_mq_debugfs_register_sched(struct request_queue *q) |
d332ce09 OS |
799 | { |
800 | struct elevator_type *e = q->elevator->type; | |
801 | ||
7e41c3c9 GKH |
802 | /* |
803 | * If the parent directory has not been created yet, return, we will be | |
804 | * called again later on and the directory/files will be created then. | |
805 | */ | |
806 | if (!q->debugfs_dir) | |
807 | return; | |
808 | ||
d332ce09 | 809 | if (!e->queue_debugfs_attrs) |
6cfc0081 | 810 | return; |
d332ce09 OS |
811 | |
812 | q->sched_debugfs_dir = debugfs_create_dir("sched", q->debugfs_dir); | |
d332ce09 | 813 | |
6cfc0081 | 814 | debugfs_create_files(q->sched_debugfs_dir, q, e->queue_debugfs_attrs); |
d332ce09 OS |
815 | } |
816 | ||
817 | void blk_mq_debugfs_unregister_sched(struct request_queue *q) | |
818 | { | |
819 | debugfs_remove_recursive(q->sched_debugfs_dir); | |
820 | q->sched_debugfs_dir = NULL; | |
821 | } | |
822 | ||
fb44023e BVA |
823 | static const char *rq_qos_id_to_name(enum rq_qos_id id) |
824 | { | |
825 | switch (id) { | |
826 | case RQ_QOS_WBT: | |
827 | return "wbt"; | |
828 | case RQ_QOS_LATENCY: | |
829 | return "latency"; | |
830 | case RQ_QOS_COST: | |
831 | return "cost"; | |
556910e3 BVA |
832 | case RQ_QOS_IOPRIO: |
833 | return "ioprio"; | |
fb44023e BVA |
834 | } |
835 | return "unknown"; | |
836 | } | |
837 | ||
cc56694f ML |
838 | void blk_mq_debugfs_unregister_rqos(struct rq_qos *rqos) |
839 | { | |
840 | debugfs_remove_recursive(rqos->debugfs_dir); | |
841 | rqos->debugfs_dir = NULL; | |
842 | } | |
843 | ||
6cfc0081 | 844 | void blk_mq_debugfs_register_rqos(struct rq_qos *rqos) |
cc56694f ML |
845 | { |
846 | struct request_queue *q = rqos->q; | |
847 | const char *dir_name = rq_qos_id_to_name(rqos->id); | |
848 | ||
cc56694f | 849 | if (rqos->debugfs_dir || !rqos->ops->debugfs_attrs) |
6cfc0081 | 850 | return; |
cc56694f | 851 | |
6cfc0081 | 852 | if (!q->rqos_debugfs_dir) |
cc56694f ML |
853 | q->rqos_debugfs_dir = debugfs_create_dir("rqos", |
854 | q->debugfs_dir); | |
cc56694f ML |
855 | |
856 | rqos->debugfs_dir = debugfs_create_dir(dir_name, | |
857 | rqos->q->rqos_debugfs_dir); | |
cc56694f | 858 | |
6cfc0081 | 859 | debugfs_create_files(rqos->debugfs_dir, rqos, rqos->ops->debugfs_attrs); |
cc56694f ML |
860 | } |
861 | ||
862 | void blk_mq_debugfs_unregister_queue_rqos(struct request_queue *q) | |
863 | { | |
864 | debugfs_remove_recursive(q->rqos_debugfs_dir); | |
865 | q->rqos_debugfs_dir = NULL; | |
866 | } | |
867 | ||
6cfc0081 GKH |
868 | void blk_mq_debugfs_register_sched_hctx(struct request_queue *q, |
869 | struct blk_mq_hw_ctx *hctx) | |
d332ce09 OS |
870 | { |
871 | struct elevator_type *e = q->elevator->type; | |
872 | ||
1e91e28e S |
873 | /* |
874 | * If the parent debugfs directory has not been created yet, return; | |
875 | * We will be called again later on with appropriate parent debugfs | |
876 | * directory from blk_register_queue() | |
877 | */ | |
878 | if (!hctx->debugfs_dir) | |
879 | return; | |
880 | ||
d332ce09 | 881 | if (!e->hctx_debugfs_attrs) |
6cfc0081 | 882 | return; |
d332ce09 OS |
883 | |
884 | hctx->sched_debugfs_dir = debugfs_create_dir("sched", | |
885 | hctx->debugfs_dir); | |
6cfc0081 GKH |
886 | debugfs_create_files(hctx->sched_debugfs_dir, hctx, |
887 | e->hctx_debugfs_attrs); | |
d332ce09 OS |
888 | } |
889 | ||
890 | void blk_mq_debugfs_unregister_sched_hctx(struct blk_mq_hw_ctx *hctx) | |
891 | { | |
892 | debugfs_remove_recursive(hctx->sched_debugfs_dir); | |
893 | hctx->sched_debugfs_dir = NULL; | |
894 | } |