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 | ||
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 }, |
a98b05b0 | 163 | { "zone_wplugs", 0400, queue_zone_wplugs_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), | |
745ed372 | 259 | RQF_NAME(TIMED_OUT), |
745ed372 | 260 | RQF_NAME(RESV), |
8658dca8 | 261 | }; |
1a435111 | 262 | #undef RQF_NAME |
8658dca8 | 263 | |
ec6dcf63 BVA |
264 | static const char *const blk_mq_rq_state_name_array[] = { |
265 | [MQ_RQ_IDLE] = "idle", | |
266 | [MQ_RQ_IN_FLIGHT] = "in_flight", | |
267 | [MQ_RQ_COMPLETE] = "complete", | |
268 | }; | |
269 | ||
270 | static const char *blk_mq_rq_state_name(enum mq_rq_state rq_state) | |
271 | { | |
a1e79188 | 272 | if (WARN_ON_ONCE((unsigned int)rq_state >= |
ec6dcf63 BVA |
273 | ARRAY_SIZE(blk_mq_rq_state_name_array))) |
274 | return "(?)"; | |
275 | return blk_mq_rq_state_name_array[rq_state]; | |
276 | } | |
277 | ||
daaadb3e | 278 | int __blk_mq_debugfs_rq_show(struct seq_file *m, struct request *rq) |
950cd7e9 | 279 | { |
2836ee4b | 280 | const struct blk_mq_ops *const mq_ops = rq->q->mq_ops; |
77e7ffd7 | 281 | const enum req_op op = req_op(rq); |
874c893b | 282 | const char *op_str = blk_op_str(op); |
950cd7e9 | 283 | |
8658dca8 | 284 | seq_printf(m, "%p {.op=", rq); |
874c893b | 285 | if (strcmp(op_str, "UNKNOWN") == 0) |
3f6d385f | 286 | seq_printf(m, "%u", op); |
8658dca8 | 287 | else |
874c893b | 288 | seq_printf(m, "%s", op_str); |
8658dca8 | 289 | seq_puts(m, ", .cmd_flags="); |
16458cf3 BVA |
290 | blk_flags_show(m, (__force unsigned int)(rq->cmd_flags & ~REQ_OP_MASK), |
291 | cmd_flag_name, ARRAY_SIZE(cmd_flag_name)); | |
8658dca8 BVA |
292 | seq_puts(m, ", .rq_flags="); |
293 | blk_flags_show(m, (__force unsigned int)rq->rq_flags, rqf_name, | |
294 | ARRAY_SIZE(rqf_name)); | |
ec6dcf63 | 295 | seq_printf(m, ", .state=%s", blk_mq_rq_state_name(blk_mq_rq_state(rq))); |
2836ee4b | 296 | seq_printf(m, ", .tag=%d, .internal_tag=%d", rq->tag, |
8658dca8 | 297 | rq->internal_tag); |
2836ee4b BVA |
298 | if (mq_ops->show_rq) |
299 | mq_ops->show_rq(m, rq); | |
300 | seq_puts(m, "}\n"); | |
950cd7e9 OS |
301 | return 0; |
302 | } | |
daaadb3e OS |
303 | EXPORT_SYMBOL_GPL(__blk_mq_debugfs_rq_show); |
304 | ||
305 | int blk_mq_debugfs_rq_show(struct seq_file *m, void *v) | |
306 | { | |
307 | return __blk_mq_debugfs_rq_show(m, list_entry_rq(v)); | |
308 | } | |
16b738f6 | 309 | EXPORT_SYMBOL_GPL(blk_mq_debugfs_rq_show); |
950cd7e9 OS |
310 | |
311 | static void *hctx_dispatch_start(struct seq_file *m, loff_t *pos) | |
f3bcb0e6 | 312 | __acquires(&hctx->lock) |
950cd7e9 OS |
313 | { |
314 | struct blk_mq_hw_ctx *hctx = m->private; | |
315 | ||
316 | spin_lock(&hctx->lock); | |
317 | return seq_list_start(&hctx->dispatch, *pos); | |
318 | } | |
319 | ||
320 | static void *hctx_dispatch_next(struct seq_file *m, void *v, loff_t *pos) | |
321 | { | |
322 | struct blk_mq_hw_ctx *hctx = m->private; | |
323 | ||
324 | return seq_list_next(v, &hctx->dispatch, pos); | |
325 | } | |
326 | ||
327 | static void hctx_dispatch_stop(struct seq_file *m, void *v) | |
f3bcb0e6 | 328 | __releases(&hctx->lock) |
950cd7e9 OS |
329 | { |
330 | struct blk_mq_hw_ctx *hctx = m->private; | |
331 | ||
332 | spin_unlock(&hctx->lock); | |
333 | } | |
334 | ||
335 | static const struct seq_operations hctx_dispatch_seq_ops = { | |
336 | .start = hctx_dispatch_start, | |
337 | .next = hctx_dispatch_next, | |
338 | .stop = hctx_dispatch_stop, | |
339 | .show = blk_mq_debugfs_rq_show, | |
340 | }; | |
341 | ||
2720bab5 BVA |
342 | struct show_busy_params { |
343 | struct seq_file *m; | |
344 | struct blk_mq_hw_ctx *hctx; | |
345 | }; | |
346 | ||
347 | /* | |
348 | * Note: the state of a request may change while this function is in progress, | |
7baa8572 JA |
349 | * e.g. due to a concurrent blk_mq_finish_request() call. Returns true to |
350 | * keep iterating requests. | |
2720bab5 | 351 | */ |
2dd6532e | 352 | static bool hctx_show_busy_rq(struct request *rq, void *data) |
2720bab5 BVA |
353 | { |
354 | const struct show_busy_params *params = data; | |
355 | ||
ea4f995e | 356 | if (rq->mq_hctx == params->hctx) |
b5fc1e8b | 357 | __blk_mq_debugfs_rq_show(params->m, rq); |
7baa8572 JA |
358 | |
359 | return true; | |
2720bab5 BVA |
360 | } |
361 | ||
362 | static int hctx_busy_show(void *data, struct seq_file *m) | |
363 | { | |
364 | struct blk_mq_hw_ctx *hctx = data; | |
365 | struct show_busy_params params = { .m = m, .hctx = hctx }; | |
366 | ||
367 | blk_mq_tagset_busy_iter(hctx->queue->tag_set, hctx_show_busy_rq, | |
368 | ¶ms); | |
369 | ||
370 | return 0; | |
371 | } | |
372 | ||
346fc108 ML |
373 | static const char *const hctx_types[] = { |
374 | [HCTX_TYPE_DEFAULT] = "default", | |
375 | [HCTX_TYPE_READ] = "read", | |
376 | [HCTX_TYPE_POLL] = "poll", | |
377 | }; | |
378 | ||
379 | static int hctx_type_show(void *data, struct seq_file *m) | |
380 | { | |
381 | struct blk_mq_hw_ctx *hctx = data; | |
382 | ||
383 | BUILD_BUG_ON(ARRAY_SIZE(hctx_types) != HCTX_MAX_TYPES); | |
384 | seq_printf(m, "%s\n", hctx_types[hctx->type]); | |
385 | return 0; | |
386 | } | |
387 | ||
f57de23a | 388 | static int hctx_ctx_map_show(void *data, struct seq_file *m) |
0bfa5288 | 389 | { |
f57de23a | 390 | struct blk_mq_hw_ctx *hctx = data; |
0bfa5288 OS |
391 | |
392 | sbitmap_bitmap_show(&hctx->ctx_map, m); | |
393 | return 0; | |
394 | } | |
395 | ||
d96b37c0 OS |
396 | static void blk_mq_debugfs_tags_show(struct seq_file *m, |
397 | struct blk_mq_tags *tags) | |
398 | { | |
399 | seq_printf(m, "nr_tags=%u\n", tags->nr_tags); | |
400 | seq_printf(m, "nr_reserved_tags=%u\n", tags->nr_reserved_tags); | |
401 | seq_printf(m, "active_queues=%d\n", | |
4f1731df | 402 | READ_ONCE(tags->active_queues)); |
d96b37c0 OS |
403 | |
404 | seq_puts(m, "\nbitmap_tags:\n"); | |
ae0f1a73 | 405 | sbitmap_queue_show(&tags->bitmap_tags, m); |
d96b37c0 OS |
406 | |
407 | if (tags->nr_reserved_tags) { | |
408 | seq_puts(m, "\nbreserved_tags:\n"); | |
ae0f1a73 | 409 | sbitmap_queue_show(&tags->breserved_tags, m); |
d96b37c0 OS |
410 | } |
411 | } | |
412 | ||
f57de23a | 413 | static int hctx_tags_show(void *data, struct seq_file *m) |
d96b37c0 | 414 | { |
f57de23a | 415 | struct blk_mq_hw_ctx *hctx = data; |
d96b37c0 | 416 | struct request_queue *q = hctx->queue; |
8c0f14ea | 417 | int res; |
d96b37c0 | 418 | |
8c0f14ea BVA |
419 | res = mutex_lock_interruptible(&q->sysfs_lock); |
420 | if (res) | |
421 | goto out; | |
d96b37c0 OS |
422 | if (hctx->tags) |
423 | blk_mq_debugfs_tags_show(m, hctx->tags); | |
424 | mutex_unlock(&q->sysfs_lock); | |
425 | ||
8c0f14ea BVA |
426 | out: |
427 | return res; | |
d96b37c0 OS |
428 | } |
429 | ||
f57de23a | 430 | static int hctx_tags_bitmap_show(void *data, struct seq_file *m) |
d7e3621a | 431 | { |
f57de23a | 432 | struct blk_mq_hw_ctx *hctx = data; |
d7e3621a | 433 | struct request_queue *q = hctx->queue; |
8c0f14ea | 434 | int res; |
d7e3621a | 435 | |
8c0f14ea BVA |
436 | res = mutex_lock_interruptible(&q->sysfs_lock); |
437 | if (res) | |
438 | goto out; | |
d7e3621a | 439 | if (hctx->tags) |
ae0f1a73 | 440 | sbitmap_bitmap_show(&hctx->tags->bitmap_tags.sb, m); |
d7e3621a | 441 | mutex_unlock(&q->sysfs_lock); |
8c0f14ea BVA |
442 | |
443 | out: | |
444 | return res; | |
d7e3621a OS |
445 | } |
446 | ||
f57de23a | 447 | static int hctx_sched_tags_show(void *data, struct seq_file *m) |
d96b37c0 | 448 | { |
f57de23a | 449 | struct blk_mq_hw_ctx *hctx = data; |
d96b37c0 | 450 | struct request_queue *q = hctx->queue; |
8c0f14ea | 451 | int res; |
d96b37c0 | 452 | |
8c0f14ea BVA |
453 | res = mutex_lock_interruptible(&q->sysfs_lock); |
454 | if (res) | |
455 | goto out; | |
d96b37c0 OS |
456 | if (hctx->sched_tags) |
457 | blk_mq_debugfs_tags_show(m, hctx->sched_tags); | |
458 | mutex_unlock(&q->sysfs_lock); | |
459 | ||
8c0f14ea BVA |
460 | out: |
461 | return res; | |
d96b37c0 OS |
462 | } |
463 | ||
f57de23a | 464 | static int hctx_sched_tags_bitmap_show(void *data, struct seq_file *m) |
d7e3621a | 465 | { |
f57de23a | 466 | struct blk_mq_hw_ctx *hctx = data; |
d7e3621a | 467 | struct request_queue *q = hctx->queue; |
8c0f14ea | 468 | int res; |
d7e3621a | 469 | |
8c0f14ea BVA |
470 | res = mutex_lock_interruptible(&q->sysfs_lock); |
471 | if (res) | |
472 | goto out; | |
d7e3621a | 473 | if (hctx->sched_tags) |
ae0f1a73 | 474 | sbitmap_bitmap_show(&hctx->sched_tags->bitmap_tags.sb, m); |
d7e3621a | 475 | mutex_unlock(&q->sysfs_lock); |
8c0f14ea BVA |
476 | |
477 | out: | |
478 | return res; | |
d7e3621a OS |
479 | } |
480 | ||
f57de23a | 481 | static int hctx_active_show(void *data, struct seq_file *m) |
4a46f05e | 482 | { |
f57de23a | 483 | struct blk_mq_hw_ctx *hctx = data; |
4a46f05e | 484 | |
9b84c629 | 485 | seq_printf(m, "%d\n", __blk_mq_active_requests(hctx)); |
4a46f05e OS |
486 | return 0; |
487 | } | |
488 | ||
6e768717 ML |
489 | static int hctx_dispatch_busy_show(void *data, struct seq_file *m) |
490 | { | |
491 | struct blk_mq_hw_ctx *hctx = data; | |
492 | ||
493 | seq_printf(m, "%u\n", hctx->dispatch_busy); | |
494 | return 0; | |
495 | } | |
496 | ||
c16d6b5a ML |
497 | #define CTX_RQ_SEQ_OPS(name, type) \ |
498 | static void *ctx_##name##_rq_list_start(struct seq_file *m, loff_t *pos) \ | |
499 | __acquires(&ctx->lock) \ | |
500 | { \ | |
501 | struct blk_mq_ctx *ctx = m->private; \ | |
502 | \ | |
503 | spin_lock(&ctx->lock); \ | |
504 | return seq_list_start(&ctx->rq_lists[type], *pos); \ | |
505 | } \ | |
506 | \ | |
507 | static void *ctx_##name##_rq_list_next(struct seq_file *m, void *v, \ | |
508 | loff_t *pos) \ | |
509 | { \ | |
510 | struct blk_mq_ctx *ctx = m->private; \ | |
511 | \ | |
512 | return seq_list_next(v, &ctx->rq_lists[type], pos); \ | |
513 | } \ | |
514 | \ | |
515 | static void ctx_##name##_rq_list_stop(struct seq_file *m, void *v) \ | |
516 | __releases(&ctx->lock) \ | |
517 | { \ | |
518 | struct blk_mq_ctx *ctx = m->private; \ | |
519 | \ | |
520 | spin_unlock(&ctx->lock); \ | |
521 | } \ | |
522 | \ | |
523 | static const struct seq_operations ctx_##name##_rq_list_seq_ops = { \ | |
524 | .start = ctx_##name##_rq_list_start, \ | |
525 | .next = ctx_##name##_rq_list_next, \ | |
526 | .stop = ctx_##name##_rq_list_stop, \ | |
527 | .show = blk_mq_debugfs_rq_show, \ | |
528 | } | |
529 | ||
530 | CTX_RQ_SEQ_OPS(default, HCTX_TYPE_DEFAULT); | |
531 | CTX_RQ_SEQ_OPS(read, HCTX_TYPE_READ); | |
532 | CTX_RQ_SEQ_OPS(poll, HCTX_TYPE_POLL); | |
950cd7e9 | 533 | |
f57de23a OS |
534 | static int blk_mq_debugfs_show(struct seq_file *m, void *v) |
535 | { | |
536 | const struct blk_mq_debugfs_attr *attr = m->private; | |
537 | void *data = d_inode(m->file->f_path.dentry->d_parent)->i_private; | |
538 | ||
539 | return attr->show(data, m); | |
540 | } | |
541 | ||
542 | static ssize_t blk_mq_debugfs_write(struct file *file, const char __user *buf, | |
543 | size_t count, loff_t *ppos) | |
4a46f05e OS |
544 | { |
545 | struct seq_file *m = file->private_data; | |
f57de23a OS |
546 | const struct blk_mq_debugfs_attr *attr = m->private; |
547 | void *data = d_inode(file->f_path.dentry->d_parent)->i_private; | |
4a46f05e | 548 | |
6b136a24 EG |
549 | /* |
550 | * Attributes that only implement .seq_ops are read-only and 'attr' is | |
551 | * the same with 'data' in this case. | |
552 | */ | |
553 | if (attr == data || !attr->write) | |
f57de23a OS |
554 | return -EPERM; |
555 | ||
556 | return attr->write(data, buf, count, ppos); | |
557 | } | |
558 | ||
559 | static int blk_mq_debugfs_open(struct inode *inode, struct file *file) | |
560 | { | |
561 | const struct blk_mq_debugfs_attr *attr = inode->i_private; | |
562 | void *data = d_inode(file->f_path.dentry->d_parent)->i_private; | |
563 | struct seq_file *m; | |
564 | int ret; | |
565 | ||
566 | if (attr->seq_ops) { | |
567 | ret = seq_open(file, attr->seq_ops); | |
568 | if (!ret) { | |
569 | m = file->private_data; | |
570 | m->private = data; | |
571 | } | |
572 | return ret; | |
573 | } | |
574 | ||
575 | if (WARN_ON_ONCE(!attr->show)) | |
576 | return -EPERM; | |
577 | ||
578 | return single_open(file, blk_mq_debugfs_show, inode->i_private); | |
4a46f05e OS |
579 | } |
580 | ||
f57de23a OS |
581 | static int blk_mq_debugfs_release(struct inode *inode, struct file *file) |
582 | { | |
583 | const struct blk_mq_debugfs_attr *attr = inode->i_private; | |
584 | ||
585 | if (attr->show) | |
586 | return single_release(inode, file); | |
ee1e0359 CK |
587 | |
588 | return seq_release(inode, file); | |
f57de23a OS |
589 | } |
590 | ||
f8465933 | 591 | static const struct file_operations blk_mq_debugfs_fops = { |
f57de23a | 592 | .open = blk_mq_debugfs_open, |
4a46f05e | 593 | .read = seq_read, |
f57de23a | 594 | .write = blk_mq_debugfs_write, |
4a46f05e | 595 | .llseek = seq_lseek, |
f57de23a | 596 | .release = blk_mq_debugfs_release, |
4a46f05e OS |
597 | }; |
598 | ||
07e4fead | 599 | static const struct blk_mq_debugfs_attr blk_mq_debugfs_hctx_attrs[] = { |
f57de23a OS |
600 | {"state", 0400, hctx_state_show}, |
601 | {"flags", 0400, hctx_flags_show}, | |
602 | {"dispatch", 0400, .seq_ops = &hctx_dispatch_seq_ops}, | |
2720bab5 | 603 | {"busy", 0400, hctx_busy_show}, |
f57de23a OS |
604 | {"ctx_map", 0400, hctx_ctx_map_show}, |
605 | {"tags", 0400, hctx_tags_show}, | |
606 | {"tags_bitmap", 0400, hctx_tags_bitmap_show}, | |
607 | {"sched_tags", 0400, hctx_sched_tags_show}, | |
608 | {"sched_tags_bitmap", 0400, hctx_sched_tags_bitmap_show}, | |
f57de23a | 609 | {"active", 0400, hctx_active_show}, |
6e768717 | 610 | {"dispatch_busy", 0400, hctx_dispatch_busy_show}, |
346fc108 | 611 | {"type", 0400, hctx_type_show}, |
72f2f8f6 | 612 | {}, |
07e4fead OS |
613 | }; |
614 | ||
615 | static const struct blk_mq_debugfs_attr blk_mq_debugfs_ctx_attrs[] = { | |
c16d6b5a ML |
616 | {"default_rq_list", 0400, .seq_ops = &ctx_default_rq_list_seq_ops}, |
617 | {"read_rq_list", 0400, .seq_ops = &ctx_read_rq_list_seq_ops}, | |
618 | {"poll_rq_list", 0400, .seq_ops = &ctx_poll_rq_list_seq_ops}, | |
72f2f8f6 | 619 | {}, |
07e4fead OS |
620 | }; |
621 | ||
6cfc0081 | 622 | static void debugfs_create_files(struct dentry *parent, void *data, |
9c1051aa OS |
623 | const struct blk_mq_debugfs_attr *attr) |
624 | { | |
36991ca6 | 625 | if (IS_ERR_OR_NULL(parent)) |
6cfc0081 | 626 | return; |
36991ca6 | 627 | |
9c1051aa OS |
628 | d_inode(parent)->i_private = data; |
629 | ||
6cfc0081 GKH |
630 | for (; attr->name; attr++) |
631 | debugfs_create_file(attr->name, attr->mode, parent, | |
632 | (void *)attr, &blk_mq_debugfs_fops); | |
9c1051aa OS |
633 | } |
634 | ||
6cfc0081 | 635 | void blk_mq_debugfs_register(struct request_queue *q) |
07e4fead | 636 | { |
9c1051aa | 637 | struct blk_mq_hw_ctx *hctx; |
4f481208 | 638 | unsigned long i; |
9c1051aa | 639 | |
6cfc0081 | 640 | debugfs_create_files(q->debugfs_dir, q, blk_mq_debugfs_queue_attrs); |
07e4fead | 641 | |
9c1051aa | 642 | /* |
70e62f4b | 643 | * blk_mq_init_sched() attempted to do this already, but q->debugfs_dir |
9c1051aa OS |
644 | * didn't exist yet (because we don't know what to name the directory |
645 | * until the queue is registered to a gendisk). | |
646 | */ | |
70e62f4b OS |
647 | if (q->elevator && !q->sched_debugfs_dir) |
648 | blk_mq_debugfs_register_sched(q); | |
649 | ||
650 | /* Similarly, blk_mq_init_hctx() couldn't do this previously. */ | |
9c1051aa | 651 | queue_for_each_hw_ctx(q, hctx, i) { |
6cfc0081 GKH |
652 | if (!hctx->debugfs_dir) |
653 | blk_mq_debugfs_register_hctx(q, hctx); | |
654 | if (q->elevator && !hctx->sched_debugfs_dir) | |
655 | blk_mq_debugfs_register_sched_hctx(q, hctx); | |
9c1051aa OS |
656 | } |
657 | ||
cc56694f ML |
658 | if (q->rq_qos) { |
659 | struct rq_qos *rqos = q->rq_qos; | |
660 | ||
661 | while (rqos) { | |
662 | blk_mq_debugfs_register_rqos(rqos); | |
663 | rqos = rqos->next; | |
664 | } | |
665 | } | |
07e4fead OS |
666 | } |
667 | ||
6cfc0081 GKH |
668 | static void blk_mq_debugfs_register_ctx(struct blk_mq_hw_ctx *hctx, |
669 | struct blk_mq_ctx *ctx) | |
07e4fead OS |
670 | { |
671 | struct dentry *ctx_dir; | |
672 | char name[20]; | |
07e4fead OS |
673 | |
674 | snprintf(name, sizeof(name), "cpu%u", ctx->cpu); | |
9c1051aa | 675 | ctx_dir = debugfs_create_dir(name, hctx->debugfs_dir); |
07e4fead | 676 | |
6cfc0081 | 677 | debugfs_create_files(ctx_dir, ctx, blk_mq_debugfs_ctx_attrs); |
07e4fead OS |
678 | } |
679 | ||
6cfc0081 GKH |
680 | void blk_mq_debugfs_register_hctx(struct request_queue *q, |
681 | struct blk_mq_hw_ctx *hctx) | |
07e4fead OS |
682 | { |
683 | struct blk_mq_ctx *ctx; | |
07e4fead OS |
684 | char name[20]; |
685 | int i; | |
686 | ||
f3ec5d11 ML |
687 | if (!q->debugfs_dir) |
688 | return; | |
689 | ||
88aabbd7 | 690 | snprintf(name, sizeof(name), "hctx%u", hctx->queue_num); |
9c1051aa | 691 | hctx->debugfs_dir = debugfs_create_dir(name, q->debugfs_dir); |
07e4fead | 692 | |
6cfc0081 | 693 | debugfs_create_files(hctx->debugfs_dir, hctx, blk_mq_debugfs_hctx_attrs); |
9c1051aa | 694 | |
6cfc0081 GKH |
695 | hctx_for_each_ctx(hctx, ctx, i) |
696 | blk_mq_debugfs_register_ctx(hctx, ctx); | |
9c1051aa OS |
697 | } |
698 | ||
699 | void blk_mq_debugfs_unregister_hctx(struct blk_mq_hw_ctx *hctx) | |
700 | { | |
5cf9c91b CH |
701 | if (!hctx->queue->debugfs_dir) |
702 | return; | |
9c1051aa | 703 | debugfs_remove_recursive(hctx->debugfs_dir); |
d332ce09 | 704 | hctx->sched_debugfs_dir = NULL; |
9c1051aa | 705 | hctx->debugfs_dir = NULL; |
07e4fead OS |
706 | } |
707 | ||
6cfc0081 | 708 | void blk_mq_debugfs_register_hctxs(struct request_queue *q) |
07e4fead OS |
709 | { |
710 | struct blk_mq_hw_ctx *hctx; | |
4f481208 | 711 | unsigned long i; |
07e4fead | 712 | |
6cfc0081 GKH |
713 | queue_for_each_hw_ctx(q, hctx, i) |
714 | blk_mq_debugfs_register_hctx(q, hctx); | |
07e4fead OS |
715 | } |
716 | ||
9c1051aa | 717 | void blk_mq_debugfs_unregister_hctxs(struct request_queue *q) |
07e4fead | 718 | { |
9c1051aa | 719 | struct blk_mq_hw_ctx *hctx; |
4f481208 | 720 | unsigned long i; |
9c1051aa OS |
721 | |
722 | queue_for_each_hw_ctx(q, hctx, i) | |
723 | blk_mq_debugfs_unregister_hctx(hctx); | |
07e4fead | 724 | } |
d332ce09 | 725 | |
6cfc0081 | 726 | void blk_mq_debugfs_register_sched(struct request_queue *q) |
d332ce09 OS |
727 | { |
728 | struct elevator_type *e = q->elevator->type; | |
729 | ||
5cf9c91b CH |
730 | lockdep_assert_held(&q->debugfs_mutex); |
731 | ||
7e41c3c9 GKH |
732 | /* |
733 | * If the parent directory has not been created yet, return, we will be | |
734 | * called again later on and the directory/files will be created then. | |
735 | */ | |
736 | if (!q->debugfs_dir) | |
737 | return; | |
738 | ||
d332ce09 | 739 | if (!e->queue_debugfs_attrs) |
6cfc0081 | 740 | return; |
d332ce09 OS |
741 | |
742 | q->sched_debugfs_dir = debugfs_create_dir("sched", q->debugfs_dir); | |
d332ce09 | 743 | |
6cfc0081 | 744 | debugfs_create_files(q->sched_debugfs_dir, q, e->queue_debugfs_attrs); |
d332ce09 OS |
745 | } |
746 | ||
747 | void blk_mq_debugfs_unregister_sched(struct request_queue *q) | |
748 | { | |
5cf9c91b CH |
749 | lockdep_assert_held(&q->debugfs_mutex); |
750 | ||
d332ce09 OS |
751 | debugfs_remove_recursive(q->sched_debugfs_dir); |
752 | q->sched_debugfs_dir = NULL; | |
753 | } | |
754 | ||
fb44023e BVA |
755 | static const char *rq_qos_id_to_name(enum rq_qos_id id) |
756 | { | |
757 | switch (id) { | |
758 | case RQ_QOS_WBT: | |
759 | return "wbt"; | |
760 | case RQ_QOS_LATENCY: | |
761 | return "latency"; | |
762 | case RQ_QOS_COST: | |
763 | return "cost"; | |
764 | } | |
765 | return "unknown"; | |
766 | } | |
767 | ||
cc56694f ML |
768 | void blk_mq_debugfs_unregister_rqos(struct rq_qos *rqos) |
769 | { | |
ba91c849 | 770 | lockdep_assert_held(&rqos->disk->queue->debugfs_mutex); |
5cf9c91b | 771 | |
ba91c849 | 772 | if (!rqos->disk->queue->debugfs_dir) |
5cf9c91b | 773 | return; |
cc56694f ML |
774 | debugfs_remove_recursive(rqos->debugfs_dir); |
775 | rqos->debugfs_dir = NULL; | |
776 | } | |
777 | ||
6cfc0081 | 778 | void blk_mq_debugfs_register_rqos(struct rq_qos *rqos) |
cc56694f | 779 | { |
ba91c849 | 780 | struct request_queue *q = rqos->disk->queue; |
cc56694f ML |
781 | const char *dir_name = rq_qos_id_to_name(rqos->id); |
782 | ||
5cf9c91b CH |
783 | lockdep_assert_held(&q->debugfs_mutex); |
784 | ||
cc56694f | 785 | if (rqos->debugfs_dir || !rqos->ops->debugfs_attrs) |
6cfc0081 | 786 | return; |
cc56694f | 787 | |
6cfc0081 | 788 | if (!q->rqos_debugfs_dir) |
cc56694f ML |
789 | q->rqos_debugfs_dir = debugfs_create_dir("rqos", |
790 | q->debugfs_dir); | |
cc56694f | 791 | |
ba91c849 | 792 | rqos->debugfs_dir = debugfs_create_dir(dir_name, q->rqos_debugfs_dir); |
6cfc0081 | 793 | debugfs_create_files(rqos->debugfs_dir, rqos, rqos->ops->debugfs_attrs); |
cc56694f ML |
794 | } |
795 | ||
6cfc0081 GKH |
796 | void blk_mq_debugfs_register_sched_hctx(struct request_queue *q, |
797 | struct blk_mq_hw_ctx *hctx) | |
d332ce09 OS |
798 | { |
799 | struct elevator_type *e = q->elevator->type; | |
800 | ||
5cf9c91b CH |
801 | lockdep_assert_held(&q->debugfs_mutex); |
802 | ||
1e91e28e S |
803 | /* |
804 | * If the parent debugfs directory has not been created yet, return; | |
805 | * We will be called again later on with appropriate parent debugfs | |
806 | * directory from blk_register_queue() | |
807 | */ | |
808 | if (!hctx->debugfs_dir) | |
809 | return; | |
810 | ||
d332ce09 | 811 | if (!e->hctx_debugfs_attrs) |
6cfc0081 | 812 | return; |
d332ce09 OS |
813 | |
814 | hctx->sched_debugfs_dir = debugfs_create_dir("sched", | |
815 | hctx->debugfs_dir); | |
6cfc0081 GKH |
816 | debugfs_create_files(hctx->sched_debugfs_dir, hctx, |
817 | e->hctx_debugfs_attrs); | |
d332ce09 OS |
818 | } |
819 | ||
820 | void blk_mq_debugfs_unregister_sched_hctx(struct blk_mq_hw_ctx *hctx) | |
821 | { | |
5cf9c91b CH |
822 | lockdep_assert_held(&hctx->queue->debugfs_mutex); |
823 | ||
824 | if (!hctx->queue->debugfs_dir) | |
825 | return; | |
d332ce09 OS |
826 | debugfs_remove_recursive(hctx->sched_debugfs_dir); |
827 | hctx->sched_debugfs_dir = NULL; | |
828 | } |