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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 | ||
18fbda91 | 10 | #include "blk.h" |
07e4fead | 11 | #include "blk-mq.h" |
d173a251 | 12 | #include "blk-mq-debugfs.h" |
2aa7745b | 13 | #include "blk-mq-sched.h" |
cc56694f | 14 | #include "blk-rq-qos.h" |
07e4fead | 15 | |
1209cb7f BVA |
16 | static int queue_poll_stat_show(void *data, struct seq_file *m) |
17 | { | |
1209cb7f BVA |
18 | return 0; |
19 | } | |
20 | ||
21 | static void *queue_requeue_list_start(struct seq_file *m, loff_t *pos) | |
22 | __acquires(&q->requeue_lock) | |
23 | { | |
24 | struct request_queue *q = m->private; | |
25 | ||
26 | spin_lock_irq(&q->requeue_lock); | |
27 | return seq_list_start(&q->requeue_list, *pos); | |
28 | } | |
29 | ||
30 | static void *queue_requeue_list_next(struct seq_file *m, void *v, loff_t *pos) | |
31 | { | |
32 | struct request_queue *q = m->private; | |
33 | ||
34 | return seq_list_next(v, &q->requeue_list, pos); | |
35 | } | |
36 | ||
37 | static void queue_requeue_list_stop(struct seq_file *m, void *v) | |
38 | __releases(&q->requeue_lock) | |
39 | { | |
40 | struct request_queue *q = m->private; | |
41 | ||
42 | spin_unlock_irq(&q->requeue_lock); | |
43 | } | |
44 | ||
45 | static const struct seq_operations queue_requeue_list_seq_ops = { | |
46 | .start = queue_requeue_list_start, | |
47 | .next = queue_requeue_list_next, | |
48 | .stop = queue_requeue_list_stop, | |
49 | .show = blk_mq_debugfs_rq_show, | |
50 | }; | |
51 | ||
91d68905 BVA |
52 | static int blk_flags_show(struct seq_file *m, const unsigned long flags, |
53 | const char *const *flag_name, int flag_name_count) | |
54 | { | |
55 | bool sep = false; | |
56 | int i; | |
57 | ||
58 | for (i = 0; i < sizeof(flags) * BITS_PER_BYTE; i++) { | |
59 | if (!(flags & BIT(i))) | |
60 | continue; | |
61 | if (sep) | |
bec03d6b | 62 | seq_puts(m, "|"); |
91d68905 BVA |
63 | sep = true; |
64 | if (i < flag_name_count && flag_name[i]) | |
65 | seq_puts(m, flag_name[i]); | |
66 | else | |
67 | seq_printf(m, "%d", i); | |
68 | } | |
91d68905 BVA |
69 | return 0; |
70 | } | |
71 | ||
cd84a62e BVA |
72 | static int queue_pm_only_show(void *data, struct seq_file *m) |
73 | { | |
74 | struct request_queue *q = data; | |
75 | ||
76 | seq_printf(m, "%d\n", atomic_read(&q->pm_only)); | |
77 | return 0; | |
78 | } | |
79 | ||
1a435111 | 80 | #define QUEUE_FLAG_NAME(name) [QUEUE_FLAG_##name] = #name |
91d68905 | 81 | static const char *const blk_queue_flag_name[] = { |
1a435111 | 82 | QUEUE_FLAG_NAME(STOPPED), |
1a435111 | 83 | QUEUE_FLAG_NAME(DYING), |
1a435111 OS |
84 | QUEUE_FLAG_NAME(NOMERGES), |
85 | QUEUE_FLAG_NAME(SAME_COMP), | |
86 | QUEUE_FLAG_NAME(FAIL_IO), | |
1a435111 OS |
87 | QUEUE_FLAG_NAME(NONROT), |
88 | QUEUE_FLAG_NAME(IO_STAT), | |
1a435111 OS |
89 | QUEUE_FLAG_NAME(NOXMERGES), |
90 | QUEUE_FLAG_NAME(ADD_RANDOM), | |
d5fb8726 | 91 | QUEUE_FLAG_NAME(SYNCHRONOUS), |
1a435111 | 92 | QUEUE_FLAG_NAME(SAME_FORCE), |
1a435111 | 93 | QUEUE_FLAG_NAME(INIT_DONE), |
1cb039f3 | 94 | QUEUE_FLAG_NAME(STABLE_WRITES), |
1a435111 OS |
95 | QUEUE_FLAG_NAME(POLL), |
96 | QUEUE_FLAG_NAME(WC), | |
97 | QUEUE_FLAG_NAME(FUA), | |
1a435111 OS |
98 | QUEUE_FLAG_NAME(DAX), |
99 | QUEUE_FLAG_NAME(STATS), | |
1a435111 | 100 | QUEUE_FLAG_NAME(REGISTERED), |
22d53821 | 101 | QUEUE_FLAG_NAME(QUIESCED), |
bfe373f6 HT |
102 | QUEUE_FLAG_NAME(PCI_P2PDMA), |
103 | QUEUE_FLAG_NAME(ZONE_RESETALL), | |
104 | QUEUE_FLAG_NAME(RQ_ALLOC_TIME), | |
1dbdd99b | 105 | QUEUE_FLAG_NAME(HCTX_ACTIVE), |
dc304326 | 106 | QUEUE_FLAG_NAME(NOWAIT), |
d5fb8726 BVA |
107 | QUEUE_FLAG_NAME(SQ_SCHED), |
108 | QUEUE_FLAG_NAME(SKIP_TAGSET_QUIESCE), | |
91d68905 | 109 | }; |
1a435111 | 110 | #undef QUEUE_FLAG_NAME |
91d68905 | 111 | |
f57de23a | 112 | static int queue_state_show(void *data, struct seq_file *m) |
91d68905 | 113 | { |
f57de23a | 114 | struct request_queue *q = data; |
91d68905 BVA |
115 | |
116 | blk_flags_show(m, q->queue_flags, blk_queue_flag_name, | |
117 | ARRAY_SIZE(blk_queue_flag_name)); | |
fd07dc81 | 118 | seq_puts(m, "\n"); |
91d68905 BVA |
119 | return 0; |
120 | } | |
121 | ||
f57de23a OS |
122 | static ssize_t queue_state_write(void *data, const char __user *buf, |
123 | size_t count, loff_t *ppos) | |
91d68905 | 124 | { |
f57de23a | 125 | struct request_queue *q = data; |
71b90511 | 126 | char opbuf[16] = { }, *op; |
91d68905 | 127 | |
18d4d7d0 | 128 | /* |
1f90307e CH |
129 | * The "state" attribute is removed when the queue is removed. Don't |
130 | * allow setting the state on a dying queue to avoid a use-after-free. | |
18d4d7d0 | 131 | */ |
1f90307e | 132 | if (blk_queue_dying(q)) |
18d4d7d0 BVA |
133 | return -ENOENT; |
134 | ||
71b90511 | 135 | if (count >= sizeof(opbuf)) { |
c7e4145a OS |
136 | pr_err("%s: operation too long\n", __func__); |
137 | goto inval; | |
138 | } | |
139 | ||
71b90511 | 140 | if (copy_from_user(opbuf, buf, count)) |
91d68905 | 141 | return -EFAULT; |
71b90511 | 142 | op = strstrip(opbuf); |
91d68905 BVA |
143 | if (strcmp(op, "run") == 0) { |
144 | blk_mq_run_hw_queues(q, true); | |
145 | } else if (strcmp(op, "start") == 0) { | |
146 | blk_mq_start_stopped_hw_queues(q, true); | |
edea55ab BVA |
147 | } else if (strcmp(op, "kick") == 0) { |
148 | blk_mq_kick_requeue_list(q); | |
91d68905 | 149 | } else { |
c7e4145a OS |
150 | pr_err("%s: unsupported operation '%s'\n", __func__, op); |
151 | inval: | |
edea55ab | 152 | pr_err("%s: use 'run', 'start' or 'kick'\n", __func__); |
91d68905 BVA |
153 | return -EINVAL; |
154 | } | |
c7e4145a | 155 | return count; |
91d68905 BVA |
156 | } |
157 | ||
1209cb7f BVA |
158 | static const struct blk_mq_debugfs_attr blk_mq_debugfs_queue_attrs[] = { |
159 | { "poll_stat", 0400, queue_poll_stat_show }, | |
160 | { "requeue_list", 0400, .seq_ops = &queue_requeue_list_seq_ops }, | |
cd84a62e | 161 | { "pm_only", 0600, queue_pm_only_show, NULL }, |
1209cb7f | 162 | { "state", 0600, queue_state_show, queue_state_write }, |
18bc4230 | 163 | { "zone_wlock", 0400, queue_zone_wlock_show, NULL }, |
1209cb7f BVA |
164 | { }, |
165 | }; | |
34dbad5d | 166 | |
1a435111 | 167 | #define HCTX_STATE_NAME(name) [BLK_MQ_S_##name] = #name |
f5c0b091 | 168 | static const char *const hctx_state_name[] = { |
1a435111 OS |
169 | HCTX_STATE_NAME(STOPPED), |
170 | HCTX_STATE_NAME(TAG_ACTIVE), | |
171 | HCTX_STATE_NAME(SCHED_RESTART), | |
bf0beec0 | 172 | HCTX_STATE_NAME(INACTIVE), |
f5c0b091 | 173 | }; |
1a435111 OS |
174 | #undef HCTX_STATE_NAME |
175 | ||
f57de23a | 176 | static int hctx_state_show(void *data, struct seq_file *m) |
9abb2ad2 | 177 | { |
f57de23a | 178 | struct blk_mq_hw_ctx *hctx = data; |
9abb2ad2 | 179 | |
f5c0b091 BVA |
180 | blk_flags_show(m, hctx->state, hctx_state_name, |
181 | ARRAY_SIZE(hctx_state_name)); | |
fd07dc81 | 182 | seq_puts(m, "\n"); |
9abb2ad2 OS |
183 | return 0; |
184 | } | |
185 | ||
1a435111 | 186 | #define BLK_TAG_ALLOC_NAME(name) [BLK_TAG_ALLOC_##name] = #name |
f5c0b091 | 187 | static const char *const alloc_policy_name[] = { |
1a435111 OS |
188 | BLK_TAG_ALLOC_NAME(FIFO), |
189 | BLK_TAG_ALLOC_NAME(RR), | |
f5c0b091 | 190 | }; |
1a435111 | 191 | #undef BLK_TAG_ALLOC_NAME |
f5c0b091 | 192 | |
1a435111 | 193 | #define HCTX_FLAG_NAME(name) [ilog2(BLK_MQ_F_##name)] = #name |
f5c0b091 | 194 | static const char *const hctx_flag_name[] = { |
1a435111 | 195 | HCTX_FLAG_NAME(SHOULD_MERGE), |
51db1c37 | 196 | HCTX_FLAG_NAME(TAG_QUEUE_SHARED), |
1a435111 OS |
197 | HCTX_FLAG_NAME(BLOCKING), |
198 | HCTX_FLAG_NAME(NO_SCHED), | |
bf0beec0 | 199 | HCTX_FLAG_NAME(STACKING), |
02f938e9 | 200 | HCTX_FLAG_NAME(TAG_HCTX_SHARED), |
f5c0b091 | 201 | }; |
1a435111 | 202 | #undef HCTX_FLAG_NAME |
f5c0b091 | 203 | |
f57de23a | 204 | static int hctx_flags_show(void *data, struct seq_file *m) |
9abb2ad2 | 205 | { |
f57de23a | 206 | struct blk_mq_hw_ctx *hctx = data; |
f5c0b091 | 207 | const int alloc_policy = BLK_MQ_FLAG_TO_ALLOC_POLICY(hctx->flags); |
9abb2ad2 | 208 | |
f5c0b091 BVA |
209 | seq_puts(m, "alloc_policy="); |
210 | if (alloc_policy < ARRAY_SIZE(alloc_policy_name) && | |
211 | alloc_policy_name[alloc_policy]) | |
212 | seq_puts(m, alloc_policy_name[alloc_policy]); | |
213 | else | |
214 | seq_printf(m, "%d", alloc_policy); | |
215 | seq_puts(m, " "); | |
216 | blk_flags_show(m, | |
217 | hctx->flags ^ BLK_ALLOC_POLICY_TO_MQ_FLAG(alloc_policy), | |
218 | hctx_flag_name, ARRAY_SIZE(hctx_flag_name)); | |
fd07dc81 | 219 | seq_puts(m, "\n"); |
9abb2ad2 OS |
220 | return 0; |
221 | } | |
222 | ||
1a435111 | 223 | #define CMD_FLAG_NAME(name) [__REQ_##name] = #name |
8658dca8 | 224 | static const char *const cmd_flag_name[] = { |
1a435111 OS |
225 | CMD_FLAG_NAME(FAILFAST_DEV), |
226 | CMD_FLAG_NAME(FAILFAST_TRANSPORT), | |
227 | CMD_FLAG_NAME(FAILFAST_DRIVER), | |
228 | CMD_FLAG_NAME(SYNC), | |
229 | CMD_FLAG_NAME(META), | |
230 | CMD_FLAG_NAME(PRIO), | |
231 | CMD_FLAG_NAME(NOMERGE), | |
232 | CMD_FLAG_NAME(IDLE), | |
233 | CMD_FLAG_NAME(INTEGRITY), | |
234 | CMD_FLAG_NAME(FUA), | |
235 | CMD_FLAG_NAME(PREFLUSH), | |
236 | CMD_FLAG_NAME(RAHEAD), | |
237 | CMD_FLAG_NAME(BACKGROUND), | |
22d53821 | 238 | CMD_FLAG_NAME(NOWAIT), |
1c26010c | 239 | CMD_FLAG_NAME(NOUNMAP), |
6ce913fe | 240 | CMD_FLAG_NAME(POLLED), |
8658dca8 | 241 | }; |
1a435111 | 242 | #undef CMD_FLAG_NAME |
8658dca8 | 243 | |
1a435111 | 244 | #define RQF_NAME(name) [ilog2((__force u32)RQF_##name)] = #name |
8658dca8 | 245 | static const char *const rqf_name[] = { |
85ba3eff | 246 | RQF_NAME(STARTED), |
1a435111 OS |
247 | RQF_NAME(FLUSH_SEQ), |
248 | RQF_NAME(MIXED_MERGE), | |
1a435111 | 249 | RQF_NAME(DONTPREP), |
dd6216bb CH |
250 | RQF_NAME(SCHED_TAGS), |
251 | RQF_NAME(USE_SCHED), | |
1a435111 OS |
252 | RQF_NAME(FAILED), |
253 | RQF_NAME(QUIET), | |
1a435111 | 254 | RQF_NAME(IO_STAT), |
1a435111 OS |
255 | RQF_NAME(PM), |
256 | RQF_NAME(HASHED), | |
257 | RQF_NAME(STATS), | |
258 | RQF_NAME(SPECIAL_PAYLOAD), | |
5d75d3f2 | 259 | RQF_NAME(ZONE_WRITE_LOCKED), |
745ed372 | 260 | RQF_NAME(TIMED_OUT), |
745ed372 | 261 | RQF_NAME(RESV), |
8658dca8 | 262 | }; |
1a435111 | 263 | #undef RQF_NAME |
8658dca8 | 264 | |
ec6dcf63 BVA |
265 | static const char *const blk_mq_rq_state_name_array[] = { |
266 | [MQ_RQ_IDLE] = "idle", | |
267 | [MQ_RQ_IN_FLIGHT] = "in_flight", | |
268 | [MQ_RQ_COMPLETE] = "complete", | |
269 | }; | |
270 | ||
271 | static const char *blk_mq_rq_state_name(enum mq_rq_state rq_state) | |
272 | { | |
a1e79188 | 273 | if (WARN_ON_ONCE((unsigned int)rq_state >= |
ec6dcf63 BVA |
274 | ARRAY_SIZE(blk_mq_rq_state_name_array))) |
275 | return "(?)"; | |
276 | return blk_mq_rq_state_name_array[rq_state]; | |
277 | } | |
278 | ||
daaadb3e | 279 | int __blk_mq_debugfs_rq_show(struct seq_file *m, struct request *rq) |
950cd7e9 | 280 | { |
2836ee4b | 281 | const struct blk_mq_ops *const mq_ops = rq->q->mq_ops; |
77e7ffd7 | 282 | const enum req_op op = req_op(rq); |
874c893b | 283 | const char *op_str = blk_op_str(op); |
950cd7e9 | 284 | |
8658dca8 | 285 | seq_printf(m, "%p {.op=", rq); |
874c893b | 286 | if (strcmp(op_str, "UNKNOWN") == 0) |
3f6d385f | 287 | seq_printf(m, "%u", op); |
8658dca8 | 288 | else |
874c893b | 289 | seq_printf(m, "%s", op_str); |
8658dca8 | 290 | seq_puts(m, ", .cmd_flags="); |
16458cf3 BVA |
291 | blk_flags_show(m, (__force unsigned int)(rq->cmd_flags & ~REQ_OP_MASK), |
292 | cmd_flag_name, ARRAY_SIZE(cmd_flag_name)); | |
8658dca8 BVA |
293 | seq_puts(m, ", .rq_flags="); |
294 | blk_flags_show(m, (__force unsigned int)rq->rq_flags, rqf_name, | |
295 | ARRAY_SIZE(rqf_name)); | |
ec6dcf63 | 296 | seq_printf(m, ", .state=%s", blk_mq_rq_state_name(blk_mq_rq_state(rq))); |
2836ee4b | 297 | seq_printf(m, ", .tag=%d, .internal_tag=%d", rq->tag, |
8658dca8 | 298 | rq->internal_tag); |
2836ee4b BVA |
299 | if (mq_ops->show_rq) |
300 | mq_ops->show_rq(m, rq); | |
301 | seq_puts(m, "}\n"); | |
950cd7e9 OS |
302 | return 0; |
303 | } | |
daaadb3e OS |
304 | EXPORT_SYMBOL_GPL(__blk_mq_debugfs_rq_show); |
305 | ||
306 | int blk_mq_debugfs_rq_show(struct seq_file *m, void *v) | |
307 | { | |
308 | return __blk_mq_debugfs_rq_show(m, list_entry_rq(v)); | |
309 | } | |
16b738f6 | 310 | EXPORT_SYMBOL_GPL(blk_mq_debugfs_rq_show); |
950cd7e9 OS |
311 | |
312 | static void *hctx_dispatch_start(struct seq_file *m, loff_t *pos) | |
f3bcb0e6 | 313 | __acquires(&hctx->lock) |
950cd7e9 OS |
314 | { |
315 | struct blk_mq_hw_ctx *hctx = m->private; | |
316 | ||
317 | spin_lock(&hctx->lock); | |
318 | return seq_list_start(&hctx->dispatch, *pos); | |
319 | } | |
320 | ||
321 | static void *hctx_dispatch_next(struct seq_file *m, void *v, loff_t *pos) | |
322 | { | |
323 | struct blk_mq_hw_ctx *hctx = m->private; | |
324 | ||
325 | return seq_list_next(v, &hctx->dispatch, pos); | |
326 | } | |
327 | ||
328 | static void hctx_dispatch_stop(struct seq_file *m, void *v) | |
f3bcb0e6 | 329 | __releases(&hctx->lock) |
950cd7e9 OS |
330 | { |
331 | struct blk_mq_hw_ctx *hctx = m->private; | |
332 | ||
333 | spin_unlock(&hctx->lock); | |
334 | } | |
335 | ||
336 | static const struct seq_operations hctx_dispatch_seq_ops = { | |
337 | .start = hctx_dispatch_start, | |
338 | .next = hctx_dispatch_next, | |
339 | .stop = hctx_dispatch_stop, | |
340 | .show = blk_mq_debugfs_rq_show, | |
341 | }; | |
342 | ||
2720bab5 BVA |
343 | struct show_busy_params { |
344 | struct seq_file *m; | |
345 | struct blk_mq_hw_ctx *hctx; | |
346 | }; | |
347 | ||
348 | /* | |
349 | * Note: the state of a request may change while this function is in progress, | |
7baa8572 JA |
350 | * e.g. due to a concurrent blk_mq_finish_request() call. Returns true to |
351 | * keep iterating requests. | |
2720bab5 | 352 | */ |
2dd6532e | 353 | static bool hctx_show_busy_rq(struct request *rq, void *data) |
2720bab5 BVA |
354 | { |
355 | const struct show_busy_params *params = data; | |
356 | ||
ea4f995e | 357 | if (rq->mq_hctx == params->hctx) |
b5fc1e8b | 358 | __blk_mq_debugfs_rq_show(params->m, rq); |
7baa8572 JA |
359 | |
360 | return true; | |
2720bab5 BVA |
361 | } |
362 | ||
363 | static int hctx_busy_show(void *data, struct seq_file *m) | |
364 | { | |
365 | struct blk_mq_hw_ctx *hctx = data; | |
366 | struct show_busy_params params = { .m = m, .hctx = hctx }; | |
367 | ||
368 | blk_mq_tagset_busy_iter(hctx->queue->tag_set, hctx_show_busy_rq, | |
369 | ¶ms); | |
370 | ||
371 | return 0; | |
372 | } | |
373 | ||
346fc108 ML |
374 | static const char *const hctx_types[] = { |
375 | [HCTX_TYPE_DEFAULT] = "default", | |
376 | [HCTX_TYPE_READ] = "read", | |
377 | [HCTX_TYPE_POLL] = "poll", | |
378 | }; | |
379 | ||
380 | static int hctx_type_show(void *data, struct seq_file *m) | |
381 | { | |
382 | struct blk_mq_hw_ctx *hctx = data; | |
383 | ||
384 | BUILD_BUG_ON(ARRAY_SIZE(hctx_types) != HCTX_MAX_TYPES); | |
385 | seq_printf(m, "%s\n", hctx_types[hctx->type]); | |
386 | return 0; | |
387 | } | |
388 | ||
f57de23a | 389 | static int hctx_ctx_map_show(void *data, struct seq_file *m) |
0bfa5288 | 390 | { |
f57de23a | 391 | struct blk_mq_hw_ctx *hctx = data; |
0bfa5288 OS |
392 | |
393 | sbitmap_bitmap_show(&hctx->ctx_map, m); | |
394 | return 0; | |
395 | } | |
396 | ||
d96b37c0 OS |
397 | static void blk_mq_debugfs_tags_show(struct seq_file *m, |
398 | struct blk_mq_tags *tags) | |
399 | { | |
400 | seq_printf(m, "nr_tags=%u\n", tags->nr_tags); | |
401 | seq_printf(m, "nr_reserved_tags=%u\n", tags->nr_reserved_tags); | |
402 | seq_printf(m, "active_queues=%d\n", | |
4f1731df | 403 | READ_ONCE(tags->active_queues)); |
d96b37c0 OS |
404 | |
405 | seq_puts(m, "\nbitmap_tags:\n"); | |
ae0f1a73 | 406 | sbitmap_queue_show(&tags->bitmap_tags, m); |
d96b37c0 OS |
407 | |
408 | if (tags->nr_reserved_tags) { | |
409 | seq_puts(m, "\nbreserved_tags:\n"); | |
ae0f1a73 | 410 | sbitmap_queue_show(&tags->breserved_tags, m); |
d96b37c0 OS |
411 | } |
412 | } | |
413 | ||
f57de23a | 414 | static int hctx_tags_show(void *data, struct seq_file *m) |
d96b37c0 | 415 | { |
f57de23a | 416 | struct blk_mq_hw_ctx *hctx = data; |
d96b37c0 | 417 | struct request_queue *q = hctx->queue; |
8c0f14ea | 418 | int res; |
d96b37c0 | 419 | |
8c0f14ea BVA |
420 | res = mutex_lock_interruptible(&q->sysfs_lock); |
421 | if (res) | |
422 | goto out; | |
d96b37c0 OS |
423 | if (hctx->tags) |
424 | blk_mq_debugfs_tags_show(m, hctx->tags); | |
425 | mutex_unlock(&q->sysfs_lock); | |
426 | ||
8c0f14ea BVA |
427 | out: |
428 | return res; | |
d96b37c0 OS |
429 | } |
430 | ||
f57de23a | 431 | static int hctx_tags_bitmap_show(void *data, struct seq_file *m) |
d7e3621a | 432 | { |
f57de23a | 433 | struct blk_mq_hw_ctx *hctx = data; |
d7e3621a | 434 | struct request_queue *q = hctx->queue; |
8c0f14ea | 435 | int res; |
d7e3621a | 436 | |
8c0f14ea BVA |
437 | res = mutex_lock_interruptible(&q->sysfs_lock); |
438 | if (res) | |
439 | goto out; | |
d7e3621a | 440 | if (hctx->tags) |
ae0f1a73 | 441 | sbitmap_bitmap_show(&hctx->tags->bitmap_tags.sb, m); |
d7e3621a | 442 | mutex_unlock(&q->sysfs_lock); |
8c0f14ea BVA |
443 | |
444 | out: | |
445 | return res; | |
d7e3621a OS |
446 | } |
447 | ||
f57de23a | 448 | static int hctx_sched_tags_show(void *data, struct seq_file *m) |
d96b37c0 | 449 | { |
f57de23a | 450 | struct blk_mq_hw_ctx *hctx = data; |
d96b37c0 | 451 | struct request_queue *q = hctx->queue; |
8c0f14ea | 452 | int res; |
d96b37c0 | 453 | |
8c0f14ea BVA |
454 | res = mutex_lock_interruptible(&q->sysfs_lock); |
455 | if (res) | |
456 | goto out; | |
d96b37c0 OS |
457 | if (hctx->sched_tags) |
458 | blk_mq_debugfs_tags_show(m, hctx->sched_tags); | |
459 | mutex_unlock(&q->sysfs_lock); | |
460 | ||
8c0f14ea BVA |
461 | out: |
462 | return res; | |
d96b37c0 OS |
463 | } |
464 | ||
f57de23a | 465 | static int hctx_sched_tags_bitmap_show(void *data, struct seq_file *m) |
d7e3621a | 466 | { |
f57de23a | 467 | struct blk_mq_hw_ctx *hctx = data; |
d7e3621a | 468 | struct request_queue *q = hctx->queue; |
8c0f14ea | 469 | int res; |
d7e3621a | 470 | |
8c0f14ea BVA |
471 | res = mutex_lock_interruptible(&q->sysfs_lock); |
472 | if (res) | |
473 | goto out; | |
d7e3621a | 474 | if (hctx->sched_tags) |
ae0f1a73 | 475 | sbitmap_bitmap_show(&hctx->sched_tags->bitmap_tags.sb, m); |
d7e3621a | 476 | mutex_unlock(&q->sysfs_lock); |
8c0f14ea BVA |
477 | |
478 | out: | |
479 | return res; | |
d7e3621a OS |
480 | } |
481 | ||
f57de23a | 482 | static int hctx_active_show(void *data, struct seq_file *m) |
4a46f05e | 483 | { |
f57de23a | 484 | struct blk_mq_hw_ctx *hctx = data; |
4a46f05e | 485 | |
9b84c629 | 486 | seq_printf(m, "%d\n", __blk_mq_active_requests(hctx)); |
4a46f05e OS |
487 | return 0; |
488 | } | |
489 | ||
6e768717 ML |
490 | static int hctx_dispatch_busy_show(void *data, struct seq_file *m) |
491 | { | |
492 | struct blk_mq_hw_ctx *hctx = data; | |
493 | ||
494 | seq_printf(m, "%u\n", hctx->dispatch_busy); | |
495 | return 0; | |
496 | } | |
497 | ||
c16d6b5a ML |
498 | #define CTX_RQ_SEQ_OPS(name, type) \ |
499 | static void *ctx_##name##_rq_list_start(struct seq_file *m, loff_t *pos) \ | |
500 | __acquires(&ctx->lock) \ | |
501 | { \ | |
502 | struct blk_mq_ctx *ctx = m->private; \ | |
503 | \ | |
504 | spin_lock(&ctx->lock); \ | |
505 | return seq_list_start(&ctx->rq_lists[type], *pos); \ | |
506 | } \ | |
507 | \ | |
508 | static void *ctx_##name##_rq_list_next(struct seq_file *m, void *v, \ | |
509 | loff_t *pos) \ | |
510 | { \ | |
511 | struct blk_mq_ctx *ctx = m->private; \ | |
512 | \ | |
513 | return seq_list_next(v, &ctx->rq_lists[type], pos); \ | |
514 | } \ | |
515 | \ | |
516 | static void ctx_##name##_rq_list_stop(struct seq_file *m, void *v) \ | |
517 | __releases(&ctx->lock) \ | |
518 | { \ | |
519 | struct blk_mq_ctx *ctx = m->private; \ | |
520 | \ | |
521 | spin_unlock(&ctx->lock); \ | |
522 | } \ | |
523 | \ | |
524 | static const struct seq_operations ctx_##name##_rq_list_seq_ops = { \ | |
525 | .start = ctx_##name##_rq_list_start, \ | |
526 | .next = ctx_##name##_rq_list_next, \ | |
527 | .stop = ctx_##name##_rq_list_stop, \ | |
528 | .show = blk_mq_debugfs_rq_show, \ | |
529 | } | |
530 | ||
531 | CTX_RQ_SEQ_OPS(default, HCTX_TYPE_DEFAULT); | |
532 | CTX_RQ_SEQ_OPS(read, HCTX_TYPE_READ); | |
533 | CTX_RQ_SEQ_OPS(poll, HCTX_TYPE_POLL); | |
950cd7e9 | 534 | |
f57de23a OS |
535 | static int blk_mq_debugfs_show(struct seq_file *m, void *v) |
536 | { | |
537 | const struct blk_mq_debugfs_attr *attr = m->private; | |
538 | void *data = d_inode(m->file->f_path.dentry->d_parent)->i_private; | |
539 | ||
540 | return attr->show(data, m); | |
541 | } | |
542 | ||
543 | static ssize_t blk_mq_debugfs_write(struct file *file, const char __user *buf, | |
544 | size_t count, loff_t *ppos) | |
4a46f05e OS |
545 | { |
546 | struct seq_file *m = file->private_data; | |
f57de23a OS |
547 | const struct blk_mq_debugfs_attr *attr = m->private; |
548 | void *data = d_inode(file->f_path.dentry->d_parent)->i_private; | |
4a46f05e | 549 | |
6b136a24 EG |
550 | /* |
551 | * Attributes that only implement .seq_ops are read-only and 'attr' is | |
552 | * the same with 'data' in this case. | |
553 | */ | |
554 | if (attr == data || !attr->write) | |
f57de23a OS |
555 | return -EPERM; |
556 | ||
557 | return attr->write(data, buf, count, ppos); | |
558 | } | |
559 | ||
560 | static int blk_mq_debugfs_open(struct inode *inode, struct file *file) | |
561 | { | |
562 | const struct blk_mq_debugfs_attr *attr = inode->i_private; | |
563 | void *data = d_inode(file->f_path.dentry->d_parent)->i_private; | |
564 | struct seq_file *m; | |
565 | int ret; | |
566 | ||
567 | if (attr->seq_ops) { | |
568 | ret = seq_open(file, attr->seq_ops); | |
569 | if (!ret) { | |
570 | m = file->private_data; | |
571 | m->private = data; | |
572 | } | |
573 | return ret; | |
574 | } | |
575 | ||
576 | if (WARN_ON_ONCE(!attr->show)) | |
577 | return -EPERM; | |
578 | ||
579 | return single_open(file, blk_mq_debugfs_show, inode->i_private); | |
4a46f05e OS |
580 | } |
581 | ||
f57de23a OS |
582 | static int blk_mq_debugfs_release(struct inode *inode, struct file *file) |
583 | { | |
584 | const struct blk_mq_debugfs_attr *attr = inode->i_private; | |
585 | ||
586 | if (attr->show) | |
587 | return single_release(inode, file); | |
ee1e0359 CK |
588 | |
589 | return seq_release(inode, file); | |
f57de23a OS |
590 | } |
591 | ||
f8465933 | 592 | static const struct file_operations blk_mq_debugfs_fops = { |
f57de23a | 593 | .open = blk_mq_debugfs_open, |
4a46f05e | 594 | .read = seq_read, |
f57de23a | 595 | .write = blk_mq_debugfs_write, |
4a46f05e | 596 | .llseek = seq_lseek, |
f57de23a | 597 | .release = blk_mq_debugfs_release, |
4a46f05e OS |
598 | }; |
599 | ||
07e4fead | 600 | static const struct blk_mq_debugfs_attr blk_mq_debugfs_hctx_attrs[] = { |
f57de23a OS |
601 | {"state", 0400, hctx_state_show}, |
602 | {"flags", 0400, hctx_flags_show}, | |
603 | {"dispatch", 0400, .seq_ops = &hctx_dispatch_seq_ops}, | |
2720bab5 | 604 | {"busy", 0400, hctx_busy_show}, |
f57de23a OS |
605 | {"ctx_map", 0400, hctx_ctx_map_show}, |
606 | {"tags", 0400, hctx_tags_show}, | |
607 | {"tags_bitmap", 0400, hctx_tags_bitmap_show}, | |
608 | {"sched_tags", 0400, hctx_sched_tags_show}, | |
609 | {"sched_tags_bitmap", 0400, hctx_sched_tags_bitmap_show}, | |
f57de23a | 610 | {"active", 0400, hctx_active_show}, |
6e768717 | 611 | {"dispatch_busy", 0400, hctx_dispatch_busy_show}, |
346fc108 | 612 | {"type", 0400, hctx_type_show}, |
72f2f8f6 | 613 | {}, |
07e4fead OS |
614 | }; |
615 | ||
616 | static const struct blk_mq_debugfs_attr blk_mq_debugfs_ctx_attrs[] = { | |
c16d6b5a ML |
617 | {"default_rq_list", 0400, .seq_ops = &ctx_default_rq_list_seq_ops}, |
618 | {"read_rq_list", 0400, .seq_ops = &ctx_read_rq_list_seq_ops}, | |
619 | {"poll_rq_list", 0400, .seq_ops = &ctx_poll_rq_list_seq_ops}, | |
72f2f8f6 | 620 | {}, |
07e4fead OS |
621 | }; |
622 | ||
6cfc0081 | 623 | static void debugfs_create_files(struct dentry *parent, void *data, |
9c1051aa OS |
624 | const struct blk_mq_debugfs_attr *attr) |
625 | { | |
36991ca6 | 626 | if (IS_ERR_OR_NULL(parent)) |
6cfc0081 | 627 | return; |
36991ca6 | 628 | |
9c1051aa OS |
629 | d_inode(parent)->i_private = data; |
630 | ||
6cfc0081 GKH |
631 | for (; attr->name; attr++) |
632 | debugfs_create_file(attr->name, attr->mode, parent, | |
633 | (void *)attr, &blk_mq_debugfs_fops); | |
9c1051aa OS |
634 | } |
635 | ||
6cfc0081 | 636 | void blk_mq_debugfs_register(struct request_queue *q) |
07e4fead | 637 | { |
9c1051aa | 638 | struct blk_mq_hw_ctx *hctx; |
4f481208 | 639 | unsigned long i; |
9c1051aa | 640 | |
6cfc0081 | 641 | debugfs_create_files(q->debugfs_dir, q, blk_mq_debugfs_queue_attrs); |
07e4fead | 642 | |
9c1051aa | 643 | /* |
70e62f4b | 644 | * blk_mq_init_sched() attempted to do this already, but q->debugfs_dir |
9c1051aa OS |
645 | * didn't exist yet (because we don't know what to name the directory |
646 | * until the queue is registered to a gendisk). | |
647 | */ | |
70e62f4b OS |
648 | if (q->elevator && !q->sched_debugfs_dir) |
649 | blk_mq_debugfs_register_sched(q); | |
650 | ||
651 | /* Similarly, blk_mq_init_hctx() couldn't do this previously. */ | |
9c1051aa | 652 | queue_for_each_hw_ctx(q, hctx, i) { |
6cfc0081 GKH |
653 | if (!hctx->debugfs_dir) |
654 | blk_mq_debugfs_register_hctx(q, hctx); | |
655 | if (q->elevator && !hctx->sched_debugfs_dir) | |
656 | blk_mq_debugfs_register_sched_hctx(q, hctx); | |
9c1051aa OS |
657 | } |
658 | ||
cc56694f ML |
659 | if (q->rq_qos) { |
660 | struct rq_qos *rqos = q->rq_qos; | |
661 | ||
662 | while (rqos) { | |
663 | blk_mq_debugfs_register_rqos(rqos); | |
664 | rqos = rqos->next; | |
665 | } | |
666 | } | |
07e4fead OS |
667 | } |
668 | ||
6cfc0081 GKH |
669 | static void blk_mq_debugfs_register_ctx(struct blk_mq_hw_ctx *hctx, |
670 | struct blk_mq_ctx *ctx) | |
07e4fead OS |
671 | { |
672 | struct dentry *ctx_dir; | |
673 | char name[20]; | |
07e4fead OS |
674 | |
675 | snprintf(name, sizeof(name), "cpu%u", ctx->cpu); | |
9c1051aa | 676 | ctx_dir = debugfs_create_dir(name, hctx->debugfs_dir); |
07e4fead | 677 | |
6cfc0081 | 678 | debugfs_create_files(ctx_dir, ctx, blk_mq_debugfs_ctx_attrs); |
07e4fead OS |
679 | } |
680 | ||
6cfc0081 GKH |
681 | void blk_mq_debugfs_register_hctx(struct request_queue *q, |
682 | struct blk_mq_hw_ctx *hctx) | |
07e4fead OS |
683 | { |
684 | struct blk_mq_ctx *ctx; | |
07e4fead OS |
685 | char name[20]; |
686 | int i; | |
687 | ||
f3ec5d11 ML |
688 | if (!q->debugfs_dir) |
689 | return; | |
690 | ||
88aabbd7 | 691 | snprintf(name, sizeof(name), "hctx%u", hctx->queue_num); |
9c1051aa | 692 | hctx->debugfs_dir = debugfs_create_dir(name, q->debugfs_dir); |
07e4fead | 693 | |
6cfc0081 | 694 | debugfs_create_files(hctx->debugfs_dir, hctx, blk_mq_debugfs_hctx_attrs); |
9c1051aa | 695 | |
6cfc0081 GKH |
696 | hctx_for_each_ctx(hctx, ctx, i) |
697 | blk_mq_debugfs_register_ctx(hctx, ctx); | |
9c1051aa OS |
698 | } |
699 | ||
700 | void blk_mq_debugfs_unregister_hctx(struct blk_mq_hw_ctx *hctx) | |
701 | { | |
5cf9c91b CH |
702 | if (!hctx->queue->debugfs_dir) |
703 | return; | |
9c1051aa | 704 | debugfs_remove_recursive(hctx->debugfs_dir); |
d332ce09 | 705 | hctx->sched_debugfs_dir = NULL; |
9c1051aa | 706 | hctx->debugfs_dir = NULL; |
07e4fead OS |
707 | } |
708 | ||
6cfc0081 | 709 | void blk_mq_debugfs_register_hctxs(struct request_queue *q) |
07e4fead OS |
710 | { |
711 | struct blk_mq_hw_ctx *hctx; | |
4f481208 | 712 | unsigned long i; |
07e4fead | 713 | |
6cfc0081 GKH |
714 | queue_for_each_hw_ctx(q, hctx, i) |
715 | blk_mq_debugfs_register_hctx(q, hctx); | |
07e4fead OS |
716 | } |
717 | ||
9c1051aa | 718 | void blk_mq_debugfs_unregister_hctxs(struct request_queue *q) |
07e4fead | 719 | { |
9c1051aa | 720 | struct blk_mq_hw_ctx *hctx; |
4f481208 | 721 | unsigned long i; |
9c1051aa OS |
722 | |
723 | queue_for_each_hw_ctx(q, hctx, i) | |
724 | blk_mq_debugfs_unregister_hctx(hctx); | |
07e4fead | 725 | } |
d332ce09 | 726 | |
6cfc0081 | 727 | void blk_mq_debugfs_register_sched(struct request_queue *q) |
d332ce09 OS |
728 | { |
729 | struct elevator_type *e = q->elevator->type; | |
730 | ||
5cf9c91b CH |
731 | lockdep_assert_held(&q->debugfs_mutex); |
732 | ||
7e41c3c9 GKH |
733 | /* |
734 | * If the parent directory has not been created yet, return, we will be | |
735 | * called again later on and the directory/files will be created then. | |
736 | */ | |
737 | if (!q->debugfs_dir) | |
738 | return; | |
739 | ||
d332ce09 | 740 | if (!e->queue_debugfs_attrs) |
6cfc0081 | 741 | return; |
d332ce09 OS |
742 | |
743 | q->sched_debugfs_dir = debugfs_create_dir("sched", q->debugfs_dir); | |
d332ce09 | 744 | |
6cfc0081 | 745 | debugfs_create_files(q->sched_debugfs_dir, q, e->queue_debugfs_attrs); |
d332ce09 OS |
746 | } |
747 | ||
748 | void blk_mq_debugfs_unregister_sched(struct request_queue *q) | |
749 | { | |
5cf9c91b CH |
750 | lockdep_assert_held(&q->debugfs_mutex); |
751 | ||
d332ce09 OS |
752 | debugfs_remove_recursive(q->sched_debugfs_dir); |
753 | q->sched_debugfs_dir = NULL; | |
754 | } | |
755 | ||
fb44023e BVA |
756 | static const char *rq_qos_id_to_name(enum rq_qos_id id) |
757 | { | |
758 | switch (id) { | |
759 | case RQ_QOS_WBT: | |
760 | return "wbt"; | |
761 | case RQ_QOS_LATENCY: | |
762 | return "latency"; | |
763 | case RQ_QOS_COST: | |
764 | return "cost"; | |
765 | } | |
766 | return "unknown"; | |
767 | } | |
768 | ||
cc56694f ML |
769 | void blk_mq_debugfs_unregister_rqos(struct rq_qos *rqos) |
770 | { | |
ba91c849 | 771 | lockdep_assert_held(&rqos->disk->queue->debugfs_mutex); |
5cf9c91b | 772 | |
ba91c849 | 773 | if (!rqos->disk->queue->debugfs_dir) |
5cf9c91b | 774 | return; |
cc56694f ML |
775 | debugfs_remove_recursive(rqos->debugfs_dir); |
776 | rqos->debugfs_dir = NULL; | |
777 | } | |
778 | ||
6cfc0081 | 779 | void blk_mq_debugfs_register_rqos(struct rq_qos *rqos) |
cc56694f | 780 | { |
ba91c849 | 781 | struct request_queue *q = rqos->disk->queue; |
cc56694f ML |
782 | const char *dir_name = rq_qos_id_to_name(rqos->id); |
783 | ||
5cf9c91b CH |
784 | lockdep_assert_held(&q->debugfs_mutex); |
785 | ||
cc56694f | 786 | if (rqos->debugfs_dir || !rqos->ops->debugfs_attrs) |
6cfc0081 | 787 | return; |
cc56694f | 788 | |
6cfc0081 | 789 | if (!q->rqos_debugfs_dir) |
cc56694f ML |
790 | q->rqos_debugfs_dir = debugfs_create_dir("rqos", |
791 | q->debugfs_dir); | |
cc56694f | 792 | |
ba91c849 | 793 | rqos->debugfs_dir = debugfs_create_dir(dir_name, q->rqos_debugfs_dir); |
6cfc0081 | 794 | debugfs_create_files(rqos->debugfs_dir, rqos, rqos->ops->debugfs_attrs); |
cc56694f ML |
795 | } |
796 | ||
6cfc0081 GKH |
797 | void blk_mq_debugfs_register_sched_hctx(struct request_queue *q, |
798 | struct blk_mq_hw_ctx *hctx) | |
d332ce09 OS |
799 | { |
800 | struct elevator_type *e = q->elevator->type; | |
801 | ||
5cf9c91b CH |
802 | lockdep_assert_held(&q->debugfs_mutex); |
803 | ||
1e91e28e S |
804 | /* |
805 | * If the parent debugfs directory has not been created yet, return; | |
806 | * We will be called again later on with appropriate parent debugfs | |
807 | * directory from blk_register_queue() | |
808 | */ | |
809 | if (!hctx->debugfs_dir) | |
810 | return; | |
811 | ||
d332ce09 | 812 | if (!e->hctx_debugfs_attrs) |
6cfc0081 | 813 | return; |
d332ce09 OS |
814 | |
815 | hctx->sched_debugfs_dir = debugfs_create_dir("sched", | |
816 | hctx->debugfs_dir); | |
6cfc0081 GKH |
817 | debugfs_create_files(hctx->sched_debugfs_dir, hctx, |
818 | e->hctx_debugfs_attrs); | |
d332ce09 OS |
819 | } |
820 | ||
821 | void blk_mq_debugfs_unregister_sched_hctx(struct blk_mq_hw_ctx *hctx) | |
822 | { | |
5cf9c91b CH |
823 | lockdep_assert_held(&hctx->queue->debugfs_mutex); |
824 | ||
825 | if (!hctx->queue->debugfs_dir) | |
826 | return; | |
d332ce09 OS |
827 | debugfs_remove_recursive(hctx->sched_debugfs_dir); |
828 | hctx->sched_debugfs_dir = NULL; | |
829 | } |