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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), | |
1a435111 | 91 | QUEUE_FLAG_NAME(SAME_FORCE), |
1a435111 | 92 | QUEUE_FLAG_NAME(INIT_DONE), |
1cb039f3 | 93 | QUEUE_FLAG_NAME(STABLE_WRITES), |
1a435111 OS |
94 | QUEUE_FLAG_NAME(POLL), |
95 | QUEUE_FLAG_NAME(WC), | |
96 | QUEUE_FLAG_NAME(FUA), | |
1a435111 OS |
97 | QUEUE_FLAG_NAME(DAX), |
98 | QUEUE_FLAG_NAME(STATS), | |
1a435111 | 99 | QUEUE_FLAG_NAME(REGISTERED), |
22d53821 | 100 | QUEUE_FLAG_NAME(QUIESCED), |
bfe373f6 HT |
101 | QUEUE_FLAG_NAME(PCI_P2PDMA), |
102 | QUEUE_FLAG_NAME(ZONE_RESETALL), | |
103 | QUEUE_FLAG_NAME(RQ_ALLOC_TIME), | |
1dbdd99b | 104 | QUEUE_FLAG_NAME(HCTX_ACTIVE), |
dc304326 | 105 | QUEUE_FLAG_NAME(NOWAIT), |
91d68905 | 106 | }; |
1a435111 | 107 | #undef QUEUE_FLAG_NAME |
91d68905 | 108 | |
f57de23a | 109 | static int queue_state_show(void *data, struct seq_file *m) |
91d68905 | 110 | { |
f57de23a | 111 | struct request_queue *q = data; |
91d68905 BVA |
112 | |
113 | blk_flags_show(m, q->queue_flags, blk_queue_flag_name, | |
114 | ARRAY_SIZE(blk_queue_flag_name)); | |
fd07dc81 | 115 | seq_puts(m, "\n"); |
91d68905 BVA |
116 | return 0; |
117 | } | |
118 | ||
f57de23a OS |
119 | static ssize_t queue_state_write(void *data, const char __user *buf, |
120 | size_t count, loff_t *ppos) | |
91d68905 | 121 | { |
f57de23a | 122 | struct request_queue *q = data; |
71b90511 | 123 | char opbuf[16] = { }, *op; |
91d68905 | 124 | |
18d4d7d0 | 125 | /* |
1f90307e CH |
126 | * The "state" attribute is removed when the queue is removed. Don't |
127 | * allow setting the state on a dying queue to avoid a use-after-free. | |
18d4d7d0 | 128 | */ |
1f90307e | 129 | if (blk_queue_dying(q)) |
18d4d7d0 BVA |
130 | return -ENOENT; |
131 | ||
71b90511 | 132 | if (count >= sizeof(opbuf)) { |
c7e4145a OS |
133 | pr_err("%s: operation too long\n", __func__); |
134 | goto inval; | |
135 | } | |
136 | ||
71b90511 | 137 | if (copy_from_user(opbuf, buf, count)) |
91d68905 | 138 | return -EFAULT; |
71b90511 | 139 | op = strstrip(opbuf); |
91d68905 BVA |
140 | if (strcmp(op, "run") == 0) { |
141 | blk_mq_run_hw_queues(q, true); | |
142 | } else if (strcmp(op, "start") == 0) { | |
143 | blk_mq_start_stopped_hw_queues(q, true); | |
edea55ab BVA |
144 | } else if (strcmp(op, "kick") == 0) { |
145 | blk_mq_kick_requeue_list(q); | |
91d68905 | 146 | } else { |
c7e4145a OS |
147 | pr_err("%s: unsupported operation '%s'\n", __func__, op); |
148 | inval: | |
edea55ab | 149 | pr_err("%s: use 'run', 'start' or 'kick'\n", __func__); |
91d68905 BVA |
150 | return -EINVAL; |
151 | } | |
c7e4145a | 152 | return count; |
91d68905 BVA |
153 | } |
154 | ||
1209cb7f BVA |
155 | static const struct blk_mq_debugfs_attr blk_mq_debugfs_queue_attrs[] = { |
156 | { "poll_stat", 0400, queue_poll_stat_show }, | |
157 | { "requeue_list", 0400, .seq_ops = &queue_requeue_list_seq_ops }, | |
cd84a62e | 158 | { "pm_only", 0600, queue_pm_only_show, NULL }, |
1209cb7f | 159 | { "state", 0600, queue_state_show, queue_state_write }, |
18bc4230 | 160 | { "zone_wlock", 0400, queue_zone_wlock_show, NULL }, |
1209cb7f BVA |
161 | { }, |
162 | }; | |
34dbad5d | 163 | |
1a435111 | 164 | #define HCTX_STATE_NAME(name) [BLK_MQ_S_##name] = #name |
f5c0b091 | 165 | static const char *const hctx_state_name[] = { |
1a435111 OS |
166 | HCTX_STATE_NAME(STOPPED), |
167 | HCTX_STATE_NAME(TAG_ACTIVE), | |
168 | HCTX_STATE_NAME(SCHED_RESTART), | |
bf0beec0 | 169 | HCTX_STATE_NAME(INACTIVE), |
f5c0b091 | 170 | }; |
1a435111 OS |
171 | #undef HCTX_STATE_NAME |
172 | ||
f57de23a | 173 | static int hctx_state_show(void *data, struct seq_file *m) |
9abb2ad2 | 174 | { |
f57de23a | 175 | struct blk_mq_hw_ctx *hctx = data; |
9abb2ad2 | 176 | |
f5c0b091 BVA |
177 | blk_flags_show(m, hctx->state, hctx_state_name, |
178 | ARRAY_SIZE(hctx_state_name)); | |
fd07dc81 | 179 | seq_puts(m, "\n"); |
9abb2ad2 OS |
180 | return 0; |
181 | } | |
182 | ||
1a435111 | 183 | #define BLK_TAG_ALLOC_NAME(name) [BLK_TAG_ALLOC_##name] = #name |
f5c0b091 | 184 | static const char *const alloc_policy_name[] = { |
1a435111 OS |
185 | BLK_TAG_ALLOC_NAME(FIFO), |
186 | BLK_TAG_ALLOC_NAME(RR), | |
f5c0b091 | 187 | }; |
1a435111 | 188 | #undef BLK_TAG_ALLOC_NAME |
f5c0b091 | 189 | |
1a435111 | 190 | #define HCTX_FLAG_NAME(name) [ilog2(BLK_MQ_F_##name)] = #name |
f5c0b091 | 191 | static const char *const hctx_flag_name[] = { |
1a435111 | 192 | HCTX_FLAG_NAME(SHOULD_MERGE), |
51db1c37 | 193 | HCTX_FLAG_NAME(TAG_QUEUE_SHARED), |
1a435111 OS |
194 | HCTX_FLAG_NAME(BLOCKING), |
195 | HCTX_FLAG_NAME(NO_SCHED), | |
bf0beec0 | 196 | HCTX_FLAG_NAME(STACKING), |
02f938e9 | 197 | HCTX_FLAG_NAME(TAG_HCTX_SHARED), |
f5c0b091 | 198 | }; |
1a435111 | 199 | #undef HCTX_FLAG_NAME |
f5c0b091 | 200 | |
f57de23a | 201 | static int hctx_flags_show(void *data, struct seq_file *m) |
9abb2ad2 | 202 | { |
f57de23a | 203 | struct blk_mq_hw_ctx *hctx = data; |
f5c0b091 | 204 | const int alloc_policy = BLK_MQ_FLAG_TO_ALLOC_POLICY(hctx->flags); |
9abb2ad2 | 205 | |
f5c0b091 BVA |
206 | seq_puts(m, "alloc_policy="); |
207 | if (alloc_policy < ARRAY_SIZE(alloc_policy_name) && | |
208 | alloc_policy_name[alloc_policy]) | |
209 | seq_puts(m, alloc_policy_name[alloc_policy]); | |
210 | else | |
211 | seq_printf(m, "%d", alloc_policy); | |
212 | seq_puts(m, " "); | |
213 | blk_flags_show(m, | |
214 | hctx->flags ^ BLK_ALLOC_POLICY_TO_MQ_FLAG(alloc_policy), | |
215 | hctx_flag_name, ARRAY_SIZE(hctx_flag_name)); | |
fd07dc81 | 216 | seq_puts(m, "\n"); |
9abb2ad2 OS |
217 | return 0; |
218 | } | |
219 | ||
1a435111 | 220 | #define CMD_FLAG_NAME(name) [__REQ_##name] = #name |
8658dca8 | 221 | static const char *const cmd_flag_name[] = { |
1a435111 OS |
222 | CMD_FLAG_NAME(FAILFAST_DEV), |
223 | CMD_FLAG_NAME(FAILFAST_TRANSPORT), | |
224 | CMD_FLAG_NAME(FAILFAST_DRIVER), | |
225 | CMD_FLAG_NAME(SYNC), | |
226 | CMD_FLAG_NAME(META), | |
227 | CMD_FLAG_NAME(PRIO), | |
228 | CMD_FLAG_NAME(NOMERGE), | |
229 | CMD_FLAG_NAME(IDLE), | |
230 | CMD_FLAG_NAME(INTEGRITY), | |
231 | CMD_FLAG_NAME(FUA), | |
232 | CMD_FLAG_NAME(PREFLUSH), | |
233 | CMD_FLAG_NAME(RAHEAD), | |
234 | CMD_FLAG_NAME(BACKGROUND), | |
22d53821 | 235 | CMD_FLAG_NAME(NOWAIT), |
1c26010c | 236 | CMD_FLAG_NAME(NOUNMAP), |
6ce913fe | 237 | CMD_FLAG_NAME(POLLED), |
8658dca8 | 238 | }; |
1a435111 | 239 | #undef CMD_FLAG_NAME |
8658dca8 | 240 | |
1a435111 | 241 | #define RQF_NAME(name) [ilog2((__force u32)RQF_##name)] = #name |
8658dca8 | 242 | static const char *const rqf_name[] = { |
85ba3eff | 243 | RQF_NAME(STARTED), |
1a435111 OS |
244 | RQF_NAME(SOFTBARRIER), |
245 | RQF_NAME(FLUSH_SEQ), | |
246 | RQF_NAME(MIXED_MERGE), | |
247 | RQF_NAME(MQ_INFLIGHT), | |
248 | RQF_NAME(DONTPREP), | |
1a435111 OS |
249 | RQF_NAME(FAILED), |
250 | RQF_NAME(QUIET), | |
251 | RQF_NAME(ELVPRIV), | |
252 | RQF_NAME(IO_STAT), | |
1a435111 OS |
253 | RQF_NAME(PM), |
254 | RQF_NAME(HASHED), | |
255 | RQF_NAME(STATS), | |
256 | RQF_NAME(SPECIAL_PAYLOAD), | |
5d75d3f2 | 257 | RQF_NAME(ZONE_WRITE_LOCKED), |
745ed372 | 258 | RQF_NAME(TIMED_OUT), |
62ba0c00 | 259 | RQF_NAME(ELV), |
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", | |
402 | atomic_read(&tags->active_queues)); | |
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_run_show(void *data, struct seq_file *m) |
4a46f05e | 482 | { |
f57de23a | 483 | struct blk_mq_hw_ctx *hctx = data; |
4a46f05e OS |
484 | |
485 | seq_printf(m, "%lu\n", hctx->run); | |
486 | return 0; | |
487 | } | |
488 | ||
f57de23a OS |
489 | static ssize_t hctx_run_write(void *data, const char __user *buf, size_t count, |
490 | loff_t *ppos) | |
4a46f05e | 491 | { |
f57de23a | 492 | struct blk_mq_hw_ctx *hctx = data; |
4a46f05e OS |
493 | |
494 | hctx->run = 0; | |
495 | return count; | |
496 | } | |
497 | ||
f57de23a | 498 | static int hctx_active_show(void *data, struct seq_file *m) |
4a46f05e | 499 | { |
f57de23a | 500 | struct blk_mq_hw_ctx *hctx = data; |
4a46f05e | 501 | |
9b84c629 | 502 | seq_printf(m, "%d\n", __blk_mq_active_requests(hctx)); |
4a46f05e OS |
503 | return 0; |
504 | } | |
505 | ||
6e768717 ML |
506 | static int hctx_dispatch_busy_show(void *data, struct seq_file *m) |
507 | { | |
508 | struct blk_mq_hw_ctx *hctx = data; | |
509 | ||
510 | seq_printf(m, "%u\n", hctx->dispatch_busy); | |
511 | return 0; | |
512 | } | |
513 | ||
c16d6b5a ML |
514 | #define CTX_RQ_SEQ_OPS(name, type) \ |
515 | static void *ctx_##name##_rq_list_start(struct seq_file *m, loff_t *pos) \ | |
516 | __acquires(&ctx->lock) \ | |
517 | { \ | |
518 | struct blk_mq_ctx *ctx = m->private; \ | |
519 | \ | |
520 | spin_lock(&ctx->lock); \ | |
521 | return seq_list_start(&ctx->rq_lists[type], *pos); \ | |
522 | } \ | |
523 | \ | |
524 | static void *ctx_##name##_rq_list_next(struct seq_file *m, void *v, \ | |
525 | loff_t *pos) \ | |
526 | { \ | |
527 | struct blk_mq_ctx *ctx = m->private; \ | |
528 | \ | |
529 | return seq_list_next(v, &ctx->rq_lists[type], pos); \ | |
530 | } \ | |
531 | \ | |
532 | static void ctx_##name##_rq_list_stop(struct seq_file *m, void *v) \ | |
533 | __releases(&ctx->lock) \ | |
534 | { \ | |
535 | struct blk_mq_ctx *ctx = m->private; \ | |
536 | \ | |
537 | spin_unlock(&ctx->lock); \ | |
538 | } \ | |
539 | \ | |
540 | static const struct seq_operations ctx_##name##_rq_list_seq_ops = { \ | |
541 | .start = ctx_##name##_rq_list_start, \ | |
542 | .next = ctx_##name##_rq_list_next, \ | |
543 | .stop = ctx_##name##_rq_list_stop, \ | |
544 | .show = blk_mq_debugfs_rq_show, \ | |
545 | } | |
546 | ||
547 | CTX_RQ_SEQ_OPS(default, HCTX_TYPE_DEFAULT); | |
548 | CTX_RQ_SEQ_OPS(read, HCTX_TYPE_READ); | |
549 | CTX_RQ_SEQ_OPS(poll, HCTX_TYPE_POLL); | |
950cd7e9 | 550 | |
f57de23a OS |
551 | static int blk_mq_debugfs_show(struct seq_file *m, void *v) |
552 | { | |
553 | const struct blk_mq_debugfs_attr *attr = m->private; | |
554 | void *data = d_inode(m->file->f_path.dentry->d_parent)->i_private; | |
555 | ||
556 | return attr->show(data, m); | |
557 | } | |
558 | ||
559 | static ssize_t blk_mq_debugfs_write(struct file *file, const char __user *buf, | |
560 | size_t count, loff_t *ppos) | |
4a46f05e OS |
561 | { |
562 | struct seq_file *m = file->private_data; | |
f57de23a OS |
563 | const struct blk_mq_debugfs_attr *attr = m->private; |
564 | void *data = d_inode(file->f_path.dentry->d_parent)->i_private; | |
4a46f05e | 565 | |
6b136a24 EG |
566 | /* |
567 | * Attributes that only implement .seq_ops are read-only and 'attr' is | |
568 | * the same with 'data' in this case. | |
569 | */ | |
570 | if (attr == data || !attr->write) | |
f57de23a OS |
571 | return -EPERM; |
572 | ||
573 | return attr->write(data, buf, count, ppos); | |
574 | } | |
575 | ||
576 | static int blk_mq_debugfs_open(struct inode *inode, struct file *file) | |
577 | { | |
578 | const struct blk_mq_debugfs_attr *attr = inode->i_private; | |
579 | void *data = d_inode(file->f_path.dentry->d_parent)->i_private; | |
580 | struct seq_file *m; | |
581 | int ret; | |
582 | ||
583 | if (attr->seq_ops) { | |
584 | ret = seq_open(file, attr->seq_ops); | |
585 | if (!ret) { | |
586 | m = file->private_data; | |
587 | m->private = data; | |
588 | } | |
589 | return ret; | |
590 | } | |
591 | ||
592 | if (WARN_ON_ONCE(!attr->show)) | |
593 | return -EPERM; | |
594 | ||
595 | return single_open(file, blk_mq_debugfs_show, inode->i_private); | |
4a46f05e OS |
596 | } |
597 | ||
f57de23a OS |
598 | static int blk_mq_debugfs_release(struct inode *inode, struct file *file) |
599 | { | |
600 | const struct blk_mq_debugfs_attr *attr = inode->i_private; | |
601 | ||
602 | if (attr->show) | |
603 | return single_release(inode, file); | |
ee1e0359 CK |
604 | |
605 | return seq_release(inode, file); | |
f57de23a OS |
606 | } |
607 | ||
f8465933 | 608 | static const struct file_operations blk_mq_debugfs_fops = { |
f57de23a | 609 | .open = blk_mq_debugfs_open, |
4a46f05e | 610 | .read = seq_read, |
f57de23a | 611 | .write = blk_mq_debugfs_write, |
4a46f05e | 612 | .llseek = seq_lseek, |
f57de23a | 613 | .release = blk_mq_debugfs_release, |
4a46f05e OS |
614 | }; |
615 | ||
07e4fead | 616 | static const struct blk_mq_debugfs_attr blk_mq_debugfs_hctx_attrs[] = { |
f57de23a OS |
617 | {"state", 0400, hctx_state_show}, |
618 | {"flags", 0400, hctx_flags_show}, | |
619 | {"dispatch", 0400, .seq_ops = &hctx_dispatch_seq_ops}, | |
2720bab5 | 620 | {"busy", 0400, hctx_busy_show}, |
f57de23a OS |
621 | {"ctx_map", 0400, hctx_ctx_map_show}, |
622 | {"tags", 0400, hctx_tags_show}, | |
623 | {"tags_bitmap", 0400, hctx_tags_bitmap_show}, | |
624 | {"sched_tags", 0400, hctx_sched_tags_show}, | |
625 | {"sched_tags_bitmap", 0400, hctx_sched_tags_bitmap_show}, | |
f57de23a OS |
626 | {"run", 0600, hctx_run_show, hctx_run_write}, |
627 | {"active", 0400, hctx_active_show}, | |
6e768717 | 628 | {"dispatch_busy", 0400, hctx_dispatch_busy_show}, |
346fc108 | 629 | {"type", 0400, hctx_type_show}, |
72f2f8f6 | 630 | {}, |
07e4fead OS |
631 | }; |
632 | ||
633 | static const struct blk_mq_debugfs_attr blk_mq_debugfs_ctx_attrs[] = { | |
c16d6b5a ML |
634 | {"default_rq_list", 0400, .seq_ops = &ctx_default_rq_list_seq_ops}, |
635 | {"read_rq_list", 0400, .seq_ops = &ctx_read_rq_list_seq_ops}, | |
636 | {"poll_rq_list", 0400, .seq_ops = &ctx_poll_rq_list_seq_ops}, | |
72f2f8f6 | 637 | {}, |
07e4fead OS |
638 | }; |
639 | ||
6cfc0081 | 640 | static void debugfs_create_files(struct dentry *parent, void *data, |
9c1051aa OS |
641 | const struct blk_mq_debugfs_attr *attr) |
642 | { | |
36991ca6 | 643 | if (IS_ERR_OR_NULL(parent)) |
6cfc0081 | 644 | return; |
36991ca6 | 645 | |
9c1051aa OS |
646 | d_inode(parent)->i_private = data; |
647 | ||
6cfc0081 GKH |
648 | for (; attr->name; attr++) |
649 | debugfs_create_file(attr->name, attr->mode, parent, | |
650 | (void *)attr, &blk_mq_debugfs_fops); | |
9c1051aa OS |
651 | } |
652 | ||
6cfc0081 | 653 | void blk_mq_debugfs_register(struct request_queue *q) |
07e4fead | 654 | { |
9c1051aa | 655 | struct blk_mq_hw_ctx *hctx; |
4f481208 | 656 | unsigned long i; |
9c1051aa | 657 | |
6cfc0081 | 658 | debugfs_create_files(q->debugfs_dir, q, blk_mq_debugfs_queue_attrs); |
07e4fead | 659 | |
9c1051aa | 660 | /* |
70e62f4b | 661 | * blk_mq_init_sched() attempted to do this already, but q->debugfs_dir |
9c1051aa OS |
662 | * didn't exist yet (because we don't know what to name the directory |
663 | * until the queue is registered to a gendisk). | |
664 | */ | |
70e62f4b OS |
665 | if (q->elevator && !q->sched_debugfs_dir) |
666 | blk_mq_debugfs_register_sched(q); | |
667 | ||
668 | /* Similarly, blk_mq_init_hctx() couldn't do this previously. */ | |
9c1051aa | 669 | queue_for_each_hw_ctx(q, hctx, i) { |
6cfc0081 GKH |
670 | if (!hctx->debugfs_dir) |
671 | blk_mq_debugfs_register_hctx(q, hctx); | |
672 | if (q->elevator && !hctx->sched_debugfs_dir) | |
673 | blk_mq_debugfs_register_sched_hctx(q, hctx); | |
9c1051aa OS |
674 | } |
675 | ||
cc56694f ML |
676 | if (q->rq_qos) { |
677 | struct rq_qos *rqos = q->rq_qos; | |
678 | ||
679 | while (rqos) { | |
680 | blk_mq_debugfs_register_rqos(rqos); | |
681 | rqos = rqos->next; | |
682 | } | |
683 | } | |
07e4fead OS |
684 | } |
685 | ||
6cfc0081 GKH |
686 | static void blk_mq_debugfs_register_ctx(struct blk_mq_hw_ctx *hctx, |
687 | struct blk_mq_ctx *ctx) | |
07e4fead OS |
688 | { |
689 | struct dentry *ctx_dir; | |
690 | char name[20]; | |
07e4fead OS |
691 | |
692 | snprintf(name, sizeof(name), "cpu%u", ctx->cpu); | |
9c1051aa | 693 | ctx_dir = debugfs_create_dir(name, hctx->debugfs_dir); |
07e4fead | 694 | |
6cfc0081 | 695 | debugfs_create_files(ctx_dir, ctx, blk_mq_debugfs_ctx_attrs); |
07e4fead OS |
696 | } |
697 | ||
6cfc0081 GKH |
698 | void blk_mq_debugfs_register_hctx(struct request_queue *q, |
699 | struct blk_mq_hw_ctx *hctx) | |
07e4fead OS |
700 | { |
701 | struct blk_mq_ctx *ctx; | |
07e4fead OS |
702 | char name[20]; |
703 | int i; | |
704 | ||
f3ec5d11 ML |
705 | if (!q->debugfs_dir) |
706 | return; | |
707 | ||
88aabbd7 | 708 | snprintf(name, sizeof(name), "hctx%u", hctx->queue_num); |
9c1051aa | 709 | hctx->debugfs_dir = debugfs_create_dir(name, q->debugfs_dir); |
07e4fead | 710 | |
6cfc0081 | 711 | debugfs_create_files(hctx->debugfs_dir, hctx, blk_mq_debugfs_hctx_attrs); |
9c1051aa | 712 | |
6cfc0081 GKH |
713 | hctx_for_each_ctx(hctx, ctx, i) |
714 | blk_mq_debugfs_register_ctx(hctx, ctx); | |
9c1051aa OS |
715 | } |
716 | ||
717 | void blk_mq_debugfs_unregister_hctx(struct blk_mq_hw_ctx *hctx) | |
718 | { | |
5cf9c91b CH |
719 | if (!hctx->queue->debugfs_dir) |
720 | return; | |
9c1051aa | 721 | debugfs_remove_recursive(hctx->debugfs_dir); |
d332ce09 | 722 | hctx->sched_debugfs_dir = NULL; |
9c1051aa | 723 | hctx->debugfs_dir = NULL; |
07e4fead OS |
724 | } |
725 | ||
6cfc0081 | 726 | void blk_mq_debugfs_register_hctxs(struct request_queue *q) |
07e4fead OS |
727 | { |
728 | struct blk_mq_hw_ctx *hctx; | |
4f481208 | 729 | unsigned long i; |
07e4fead | 730 | |
6cfc0081 GKH |
731 | queue_for_each_hw_ctx(q, hctx, i) |
732 | blk_mq_debugfs_register_hctx(q, hctx); | |
07e4fead OS |
733 | } |
734 | ||
9c1051aa | 735 | void blk_mq_debugfs_unregister_hctxs(struct request_queue *q) |
07e4fead | 736 | { |
9c1051aa | 737 | struct blk_mq_hw_ctx *hctx; |
4f481208 | 738 | unsigned long i; |
9c1051aa OS |
739 | |
740 | queue_for_each_hw_ctx(q, hctx, i) | |
741 | blk_mq_debugfs_unregister_hctx(hctx); | |
07e4fead | 742 | } |
d332ce09 | 743 | |
6cfc0081 | 744 | void blk_mq_debugfs_register_sched(struct request_queue *q) |
d332ce09 OS |
745 | { |
746 | struct elevator_type *e = q->elevator->type; | |
747 | ||
5cf9c91b CH |
748 | lockdep_assert_held(&q->debugfs_mutex); |
749 | ||
7e41c3c9 GKH |
750 | /* |
751 | * If the parent directory has not been created yet, return, we will be | |
752 | * called again later on and the directory/files will be created then. | |
753 | */ | |
754 | if (!q->debugfs_dir) | |
755 | return; | |
756 | ||
d332ce09 | 757 | if (!e->queue_debugfs_attrs) |
6cfc0081 | 758 | return; |
d332ce09 OS |
759 | |
760 | q->sched_debugfs_dir = debugfs_create_dir("sched", q->debugfs_dir); | |
d332ce09 | 761 | |
6cfc0081 | 762 | debugfs_create_files(q->sched_debugfs_dir, q, e->queue_debugfs_attrs); |
d332ce09 OS |
763 | } |
764 | ||
765 | void blk_mq_debugfs_unregister_sched(struct request_queue *q) | |
766 | { | |
5cf9c91b CH |
767 | lockdep_assert_held(&q->debugfs_mutex); |
768 | ||
d332ce09 OS |
769 | debugfs_remove_recursive(q->sched_debugfs_dir); |
770 | q->sched_debugfs_dir = NULL; | |
771 | } | |
772 | ||
fb44023e BVA |
773 | static const char *rq_qos_id_to_name(enum rq_qos_id id) |
774 | { | |
775 | switch (id) { | |
776 | case RQ_QOS_WBT: | |
777 | return "wbt"; | |
778 | case RQ_QOS_LATENCY: | |
779 | return "latency"; | |
780 | case RQ_QOS_COST: | |
781 | return "cost"; | |
782 | } | |
783 | return "unknown"; | |
784 | } | |
785 | ||
cc56694f ML |
786 | void blk_mq_debugfs_unregister_rqos(struct rq_qos *rqos) |
787 | { | |
ba91c849 | 788 | lockdep_assert_held(&rqos->disk->queue->debugfs_mutex); |
5cf9c91b | 789 | |
ba91c849 | 790 | if (!rqos->disk->queue->debugfs_dir) |
5cf9c91b | 791 | return; |
cc56694f ML |
792 | debugfs_remove_recursive(rqos->debugfs_dir); |
793 | rqos->debugfs_dir = NULL; | |
794 | } | |
795 | ||
6cfc0081 | 796 | void blk_mq_debugfs_register_rqos(struct rq_qos *rqos) |
cc56694f | 797 | { |
ba91c849 | 798 | struct request_queue *q = rqos->disk->queue; |
cc56694f ML |
799 | const char *dir_name = rq_qos_id_to_name(rqos->id); |
800 | ||
5cf9c91b CH |
801 | lockdep_assert_held(&q->debugfs_mutex); |
802 | ||
cc56694f | 803 | if (rqos->debugfs_dir || !rqos->ops->debugfs_attrs) |
6cfc0081 | 804 | return; |
cc56694f | 805 | |
6cfc0081 | 806 | if (!q->rqos_debugfs_dir) |
cc56694f ML |
807 | q->rqos_debugfs_dir = debugfs_create_dir("rqos", |
808 | q->debugfs_dir); | |
cc56694f | 809 | |
ba91c849 | 810 | rqos->debugfs_dir = debugfs_create_dir(dir_name, q->rqos_debugfs_dir); |
6cfc0081 | 811 | debugfs_create_files(rqos->debugfs_dir, rqos, rqos->ops->debugfs_attrs); |
cc56694f ML |
812 | } |
813 | ||
6cfc0081 GKH |
814 | void blk_mq_debugfs_register_sched_hctx(struct request_queue *q, |
815 | struct blk_mq_hw_ctx *hctx) | |
d332ce09 OS |
816 | { |
817 | struct elevator_type *e = q->elevator->type; | |
818 | ||
5cf9c91b CH |
819 | lockdep_assert_held(&q->debugfs_mutex); |
820 | ||
1e91e28e S |
821 | /* |
822 | * If the parent debugfs directory has not been created yet, return; | |
823 | * We will be called again later on with appropriate parent debugfs | |
824 | * directory from blk_register_queue() | |
825 | */ | |
826 | if (!hctx->debugfs_dir) | |
827 | return; | |
828 | ||
d332ce09 | 829 | if (!e->hctx_debugfs_attrs) |
6cfc0081 | 830 | return; |
d332ce09 OS |
831 | |
832 | hctx->sched_debugfs_dir = debugfs_create_dir("sched", | |
833 | hctx->debugfs_dir); | |
6cfc0081 GKH |
834 | debugfs_create_files(hctx->sched_debugfs_dir, hctx, |
835 | e->hctx_debugfs_attrs); | |
d332ce09 OS |
836 | } |
837 | ||
838 | void blk_mq_debugfs_unregister_sched_hctx(struct blk_mq_hw_ctx *hctx) | |
839 | { | |
5cf9c91b CH |
840 | lockdep_assert_held(&hctx->queue->debugfs_mutex); |
841 | ||
842 | if (!hctx->queue->debugfs_dir) | |
843 | return; | |
d332ce09 OS |
844 | debugfs_remove_recursive(hctx->sched_debugfs_dir); |
845 | hctx->sched_debugfs_dir = NULL; | |
846 | } |