Commit | Line | Data |
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8c16567d | 1 | // SPDX-License-Identifier: GPL-2.0 |
07e4fead OS |
2 | /* |
3 | * Copyright (C) 2017 Facebook | |
07e4fead OS |
4 | */ |
5 | ||
6 | #include <linux/kernel.h> | |
7 | #include <linux/blkdev.h> | |
8 | #include <linux/debugfs.h> | |
9 | ||
10 | #include <linux/blk-mq.h> | |
18fbda91 | 11 | #include "blk.h" |
07e4fead | 12 | #include "blk-mq.h" |
d173a251 | 13 | #include "blk-mq-debugfs.h" |
2aa7745b | 14 | #include "blk-mq-sched.h" |
d96b37c0 | 15 | #include "blk-mq-tag.h" |
cc56694f | 16 | #include "blk-rq-qos.h" |
07e4fead | 17 | |
1209cb7f BVA |
18 | static void print_stat(struct seq_file *m, struct blk_rq_stat *stat) |
19 | { | |
20 | if (stat->nr_samples) { | |
315eb656 | 21 | seq_printf(m, "samples=%d, mean=%llu, min=%llu, max=%llu", |
1209cb7f BVA |
22 | stat->nr_samples, stat->mean, stat->min, stat->max); |
23 | } else { | |
24 | seq_puts(m, "samples=0"); | |
25 | } | |
26 | } | |
27 | ||
28 | static int queue_poll_stat_show(void *data, struct seq_file *m) | |
29 | { | |
30 | struct request_queue *q = data; | |
31 | int bucket; | |
32 | ||
18d78171 ML |
33 | if (!q->poll_stat) |
34 | return 0; | |
35 | ||
243d9f78 CK |
36 | for (bucket = 0; bucket < (BLK_MQ_POLL_STATS_BKTS / 2); bucket++) { |
37 | seq_printf(m, "read (%d Bytes): ", 1 << (9 + bucket)); | |
38 | print_stat(m, &q->poll_stat[2 * bucket]); | |
1209cb7f BVA |
39 | seq_puts(m, "\n"); |
40 | ||
243d9f78 CK |
41 | seq_printf(m, "write (%d Bytes): ", 1 << (9 + bucket)); |
42 | print_stat(m, &q->poll_stat[2 * bucket + 1]); | |
1209cb7f BVA |
43 | seq_puts(m, "\n"); |
44 | } | |
45 | return 0; | |
46 | } | |
47 | ||
48 | static void *queue_requeue_list_start(struct seq_file *m, loff_t *pos) | |
49 | __acquires(&q->requeue_lock) | |
50 | { | |
51 | struct request_queue *q = m->private; | |
52 | ||
53 | spin_lock_irq(&q->requeue_lock); | |
54 | return seq_list_start(&q->requeue_list, *pos); | |
55 | } | |
56 | ||
57 | static void *queue_requeue_list_next(struct seq_file *m, void *v, loff_t *pos) | |
58 | { | |
59 | struct request_queue *q = m->private; | |
60 | ||
61 | return seq_list_next(v, &q->requeue_list, pos); | |
62 | } | |
63 | ||
64 | static void queue_requeue_list_stop(struct seq_file *m, void *v) | |
65 | __releases(&q->requeue_lock) | |
66 | { | |
67 | struct request_queue *q = m->private; | |
68 | ||
69 | spin_unlock_irq(&q->requeue_lock); | |
70 | } | |
71 | ||
72 | static const struct seq_operations queue_requeue_list_seq_ops = { | |
73 | .start = queue_requeue_list_start, | |
74 | .next = queue_requeue_list_next, | |
75 | .stop = queue_requeue_list_stop, | |
76 | .show = blk_mq_debugfs_rq_show, | |
77 | }; | |
78 | ||
91d68905 BVA |
79 | static int blk_flags_show(struct seq_file *m, const unsigned long flags, |
80 | const char *const *flag_name, int flag_name_count) | |
81 | { | |
82 | bool sep = false; | |
83 | int i; | |
84 | ||
85 | for (i = 0; i < sizeof(flags) * BITS_PER_BYTE; i++) { | |
86 | if (!(flags & BIT(i))) | |
87 | continue; | |
88 | if (sep) | |
bec03d6b | 89 | seq_puts(m, "|"); |
91d68905 BVA |
90 | sep = true; |
91 | if (i < flag_name_count && flag_name[i]) | |
92 | seq_puts(m, flag_name[i]); | |
93 | else | |
94 | seq_printf(m, "%d", i); | |
95 | } | |
91d68905 BVA |
96 | return 0; |
97 | } | |
98 | ||
cd84a62e BVA |
99 | static int queue_pm_only_show(void *data, struct seq_file *m) |
100 | { | |
101 | struct request_queue *q = data; | |
102 | ||
103 | seq_printf(m, "%d\n", atomic_read(&q->pm_only)); | |
104 | return 0; | |
105 | } | |
106 | ||
1a435111 | 107 | #define QUEUE_FLAG_NAME(name) [QUEUE_FLAG_##name] = #name |
91d68905 | 108 | static const char *const blk_queue_flag_name[] = { |
1a435111 | 109 | QUEUE_FLAG_NAME(STOPPED), |
1a435111 | 110 | QUEUE_FLAG_NAME(DYING), |
1a435111 OS |
111 | QUEUE_FLAG_NAME(NOMERGES), |
112 | QUEUE_FLAG_NAME(SAME_COMP), | |
113 | QUEUE_FLAG_NAME(FAIL_IO), | |
1a435111 OS |
114 | QUEUE_FLAG_NAME(NONROT), |
115 | QUEUE_FLAG_NAME(IO_STAT), | |
116 | QUEUE_FLAG_NAME(DISCARD), | |
117 | QUEUE_FLAG_NAME(NOXMERGES), | |
118 | QUEUE_FLAG_NAME(ADD_RANDOM), | |
119 | QUEUE_FLAG_NAME(SECERASE), | |
120 | QUEUE_FLAG_NAME(SAME_FORCE), | |
121 | QUEUE_FLAG_NAME(DEAD), | |
122 | QUEUE_FLAG_NAME(INIT_DONE), | |
1cb039f3 | 123 | QUEUE_FLAG_NAME(STABLE_WRITES), |
1a435111 OS |
124 | QUEUE_FLAG_NAME(POLL), |
125 | QUEUE_FLAG_NAME(WC), | |
126 | QUEUE_FLAG_NAME(FUA), | |
1a435111 OS |
127 | QUEUE_FLAG_NAME(DAX), |
128 | QUEUE_FLAG_NAME(STATS), | |
1a435111 | 129 | QUEUE_FLAG_NAME(REGISTERED), |
22d53821 | 130 | QUEUE_FLAG_NAME(QUIESCED), |
bfe373f6 HT |
131 | QUEUE_FLAG_NAME(PCI_P2PDMA), |
132 | QUEUE_FLAG_NAME(ZONE_RESETALL), | |
133 | QUEUE_FLAG_NAME(RQ_ALLOC_TIME), | |
1dbdd99b | 134 | QUEUE_FLAG_NAME(HCTX_ACTIVE), |
dc304326 | 135 | QUEUE_FLAG_NAME(NOWAIT), |
91d68905 | 136 | }; |
1a435111 | 137 | #undef QUEUE_FLAG_NAME |
91d68905 | 138 | |
f57de23a | 139 | static int queue_state_show(void *data, struct seq_file *m) |
91d68905 | 140 | { |
f57de23a | 141 | struct request_queue *q = data; |
91d68905 BVA |
142 | |
143 | blk_flags_show(m, q->queue_flags, blk_queue_flag_name, | |
144 | ARRAY_SIZE(blk_queue_flag_name)); | |
fd07dc81 | 145 | seq_puts(m, "\n"); |
91d68905 BVA |
146 | return 0; |
147 | } | |
148 | ||
f57de23a OS |
149 | static ssize_t queue_state_write(void *data, const char __user *buf, |
150 | size_t count, loff_t *ppos) | |
91d68905 | 151 | { |
f57de23a | 152 | struct request_queue *q = data; |
71b90511 | 153 | char opbuf[16] = { }, *op; |
91d68905 | 154 | |
18d4d7d0 BVA |
155 | /* |
156 | * The "state" attribute is removed after blk_cleanup_queue() has called | |
157 | * blk_mq_free_queue(). Return if QUEUE_FLAG_DEAD has been set to avoid | |
158 | * triggering a use-after-free. | |
159 | */ | |
160 | if (blk_queue_dead(q)) | |
161 | return -ENOENT; | |
162 | ||
71b90511 | 163 | if (count >= sizeof(opbuf)) { |
c7e4145a OS |
164 | pr_err("%s: operation too long\n", __func__); |
165 | goto inval; | |
166 | } | |
167 | ||
71b90511 | 168 | if (copy_from_user(opbuf, buf, count)) |
91d68905 | 169 | return -EFAULT; |
71b90511 | 170 | op = strstrip(opbuf); |
91d68905 BVA |
171 | if (strcmp(op, "run") == 0) { |
172 | blk_mq_run_hw_queues(q, true); | |
173 | } else if (strcmp(op, "start") == 0) { | |
174 | blk_mq_start_stopped_hw_queues(q, true); | |
edea55ab BVA |
175 | } else if (strcmp(op, "kick") == 0) { |
176 | blk_mq_kick_requeue_list(q); | |
91d68905 | 177 | } else { |
c7e4145a OS |
178 | pr_err("%s: unsupported operation '%s'\n", __func__, op); |
179 | inval: | |
edea55ab | 180 | pr_err("%s: use 'run', 'start' or 'kick'\n", __func__); |
91d68905 BVA |
181 | return -EINVAL; |
182 | } | |
c7e4145a | 183 | return count; |
91d68905 BVA |
184 | } |
185 | ||
1209cb7f BVA |
186 | static const struct blk_mq_debugfs_attr blk_mq_debugfs_queue_attrs[] = { |
187 | { "poll_stat", 0400, queue_poll_stat_show }, | |
188 | { "requeue_list", 0400, .seq_ops = &queue_requeue_list_seq_ops }, | |
cd84a62e | 189 | { "pm_only", 0600, queue_pm_only_show, NULL }, |
1209cb7f | 190 | { "state", 0600, queue_state_show, queue_state_write }, |
18bc4230 | 191 | { "zone_wlock", 0400, queue_zone_wlock_show, NULL }, |
1209cb7f BVA |
192 | { }, |
193 | }; | |
34dbad5d | 194 | |
1a435111 | 195 | #define HCTX_STATE_NAME(name) [BLK_MQ_S_##name] = #name |
f5c0b091 | 196 | static const char *const hctx_state_name[] = { |
1a435111 OS |
197 | HCTX_STATE_NAME(STOPPED), |
198 | HCTX_STATE_NAME(TAG_ACTIVE), | |
199 | HCTX_STATE_NAME(SCHED_RESTART), | |
bf0beec0 | 200 | HCTX_STATE_NAME(INACTIVE), |
f5c0b091 | 201 | }; |
1a435111 OS |
202 | #undef HCTX_STATE_NAME |
203 | ||
f57de23a | 204 | static int hctx_state_show(void *data, struct seq_file *m) |
9abb2ad2 | 205 | { |
f57de23a | 206 | struct blk_mq_hw_ctx *hctx = data; |
9abb2ad2 | 207 | |
f5c0b091 BVA |
208 | blk_flags_show(m, hctx->state, hctx_state_name, |
209 | ARRAY_SIZE(hctx_state_name)); | |
fd07dc81 | 210 | seq_puts(m, "\n"); |
9abb2ad2 OS |
211 | return 0; |
212 | } | |
213 | ||
1a435111 | 214 | #define BLK_TAG_ALLOC_NAME(name) [BLK_TAG_ALLOC_##name] = #name |
f5c0b091 | 215 | static const char *const alloc_policy_name[] = { |
1a435111 OS |
216 | BLK_TAG_ALLOC_NAME(FIFO), |
217 | BLK_TAG_ALLOC_NAME(RR), | |
f5c0b091 | 218 | }; |
1a435111 | 219 | #undef BLK_TAG_ALLOC_NAME |
f5c0b091 | 220 | |
1a435111 | 221 | #define HCTX_FLAG_NAME(name) [ilog2(BLK_MQ_F_##name)] = #name |
f5c0b091 | 222 | static const char *const hctx_flag_name[] = { |
1a435111 | 223 | HCTX_FLAG_NAME(SHOULD_MERGE), |
51db1c37 | 224 | HCTX_FLAG_NAME(TAG_QUEUE_SHARED), |
1a435111 OS |
225 | HCTX_FLAG_NAME(BLOCKING), |
226 | HCTX_FLAG_NAME(NO_SCHED), | |
bf0beec0 | 227 | HCTX_FLAG_NAME(STACKING), |
02f938e9 | 228 | HCTX_FLAG_NAME(TAG_HCTX_SHARED), |
f5c0b091 | 229 | }; |
1a435111 | 230 | #undef HCTX_FLAG_NAME |
f5c0b091 | 231 | |
f57de23a | 232 | static int hctx_flags_show(void *data, struct seq_file *m) |
9abb2ad2 | 233 | { |
f57de23a | 234 | struct blk_mq_hw_ctx *hctx = data; |
f5c0b091 | 235 | const int alloc_policy = BLK_MQ_FLAG_TO_ALLOC_POLICY(hctx->flags); |
9abb2ad2 | 236 | |
f5c0b091 BVA |
237 | seq_puts(m, "alloc_policy="); |
238 | if (alloc_policy < ARRAY_SIZE(alloc_policy_name) && | |
239 | alloc_policy_name[alloc_policy]) | |
240 | seq_puts(m, alloc_policy_name[alloc_policy]); | |
241 | else | |
242 | seq_printf(m, "%d", alloc_policy); | |
243 | seq_puts(m, " "); | |
244 | blk_flags_show(m, | |
245 | hctx->flags ^ BLK_ALLOC_POLICY_TO_MQ_FLAG(alloc_policy), | |
246 | hctx_flag_name, ARRAY_SIZE(hctx_flag_name)); | |
fd07dc81 | 247 | seq_puts(m, "\n"); |
9abb2ad2 OS |
248 | return 0; |
249 | } | |
250 | ||
1a435111 | 251 | #define CMD_FLAG_NAME(name) [__REQ_##name] = #name |
8658dca8 | 252 | static const char *const cmd_flag_name[] = { |
1a435111 OS |
253 | CMD_FLAG_NAME(FAILFAST_DEV), |
254 | CMD_FLAG_NAME(FAILFAST_TRANSPORT), | |
255 | CMD_FLAG_NAME(FAILFAST_DRIVER), | |
256 | CMD_FLAG_NAME(SYNC), | |
257 | CMD_FLAG_NAME(META), | |
258 | CMD_FLAG_NAME(PRIO), | |
259 | CMD_FLAG_NAME(NOMERGE), | |
260 | CMD_FLAG_NAME(IDLE), | |
261 | CMD_FLAG_NAME(INTEGRITY), | |
262 | CMD_FLAG_NAME(FUA), | |
263 | CMD_FLAG_NAME(PREFLUSH), | |
264 | CMD_FLAG_NAME(RAHEAD), | |
265 | CMD_FLAG_NAME(BACKGROUND), | |
22d53821 | 266 | CMD_FLAG_NAME(NOWAIT), |
1c26010c | 267 | CMD_FLAG_NAME(NOUNMAP), |
6ce913fe | 268 | CMD_FLAG_NAME(POLLED), |
8658dca8 | 269 | }; |
1a435111 | 270 | #undef CMD_FLAG_NAME |
8658dca8 | 271 | |
1a435111 | 272 | #define RQF_NAME(name) [ilog2((__force u32)RQF_##name)] = #name |
8658dca8 | 273 | static const char *const rqf_name[] = { |
85ba3eff | 274 | RQF_NAME(STARTED), |
1a435111 OS |
275 | RQF_NAME(SOFTBARRIER), |
276 | RQF_NAME(FLUSH_SEQ), | |
277 | RQF_NAME(MIXED_MERGE), | |
278 | RQF_NAME(MQ_INFLIGHT), | |
279 | RQF_NAME(DONTPREP), | |
1a435111 OS |
280 | RQF_NAME(FAILED), |
281 | RQF_NAME(QUIET), | |
282 | RQF_NAME(ELVPRIV), | |
283 | RQF_NAME(IO_STAT), | |
1a435111 OS |
284 | RQF_NAME(PM), |
285 | RQF_NAME(HASHED), | |
286 | RQF_NAME(STATS), | |
287 | RQF_NAME(SPECIAL_PAYLOAD), | |
5d75d3f2 | 288 | RQF_NAME(ZONE_WRITE_LOCKED), |
76a86f9d | 289 | RQF_NAME(MQ_POLL_SLEPT), |
62ba0c00 | 290 | RQF_NAME(ELV), |
8658dca8 | 291 | }; |
1a435111 | 292 | #undef RQF_NAME |
8658dca8 | 293 | |
ec6dcf63 BVA |
294 | static const char *const blk_mq_rq_state_name_array[] = { |
295 | [MQ_RQ_IDLE] = "idle", | |
296 | [MQ_RQ_IN_FLIGHT] = "in_flight", | |
297 | [MQ_RQ_COMPLETE] = "complete", | |
298 | }; | |
299 | ||
300 | static const char *blk_mq_rq_state_name(enum mq_rq_state rq_state) | |
301 | { | |
a1e79188 | 302 | if (WARN_ON_ONCE((unsigned int)rq_state >= |
ec6dcf63 BVA |
303 | ARRAY_SIZE(blk_mq_rq_state_name_array))) |
304 | return "(?)"; | |
305 | return blk_mq_rq_state_name_array[rq_state]; | |
306 | } | |
307 | ||
daaadb3e | 308 | int __blk_mq_debugfs_rq_show(struct seq_file *m, struct request *rq) |
950cd7e9 | 309 | { |
2836ee4b | 310 | const struct blk_mq_ops *const mq_ops = rq->q->mq_ops; |
f9bc64a0 | 311 | const unsigned int op = req_op(rq); |
874c893b | 312 | const char *op_str = blk_op_str(op); |
950cd7e9 | 313 | |
8658dca8 | 314 | seq_printf(m, "%p {.op=", rq); |
874c893b | 315 | if (strcmp(op_str, "UNKNOWN") == 0) |
3f6d385f | 316 | seq_printf(m, "%u", op); |
8658dca8 | 317 | else |
874c893b | 318 | seq_printf(m, "%s", op_str); |
8658dca8 BVA |
319 | seq_puts(m, ", .cmd_flags="); |
320 | blk_flags_show(m, rq->cmd_flags & ~REQ_OP_MASK, cmd_flag_name, | |
321 | ARRAY_SIZE(cmd_flag_name)); | |
322 | seq_puts(m, ", .rq_flags="); | |
323 | blk_flags_show(m, (__force unsigned int)rq->rq_flags, rqf_name, | |
324 | ARRAY_SIZE(rqf_name)); | |
ec6dcf63 | 325 | seq_printf(m, ", .state=%s", blk_mq_rq_state_name(blk_mq_rq_state(rq))); |
2836ee4b | 326 | seq_printf(m, ", .tag=%d, .internal_tag=%d", rq->tag, |
8658dca8 | 327 | rq->internal_tag); |
2836ee4b BVA |
328 | if (mq_ops->show_rq) |
329 | mq_ops->show_rq(m, rq); | |
330 | seq_puts(m, "}\n"); | |
950cd7e9 OS |
331 | return 0; |
332 | } | |
daaadb3e OS |
333 | EXPORT_SYMBOL_GPL(__blk_mq_debugfs_rq_show); |
334 | ||
335 | int blk_mq_debugfs_rq_show(struct seq_file *m, void *v) | |
336 | { | |
337 | return __blk_mq_debugfs_rq_show(m, list_entry_rq(v)); | |
338 | } | |
16b738f6 | 339 | EXPORT_SYMBOL_GPL(blk_mq_debugfs_rq_show); |
950cd7e9 OS |
340 | |
341 | static void *hctx_dispatch_start(struct seq_file *m, loff_t *pos) | |
f3bcb0e6 | 342 | __acquires(&hctx->lock) |
950cd7e9 OS |
343 | { |
344 | struct blk_mq_hw_ctx *hctx = m->private; | |
345 | ||
346 | spin_lock(&hctx->lock); | |
347 | return seq_list_start(&hctx->dispatch, *pos); | |
348 | } | |
349 | ||
350 | static void *hctx_dispatch_next(struct seq_file *m, void *v, loff_t *pos) | |
351 | { | |
352 | struct blk_mq_hw_ctx *hctx = m->private; | |
353 | ||
354 | return seq_list_next(v, &hctx->dispatch, pos); | |
355 | } | |
356 | ||
357 | static void hctx_dispatch_stop(struct seq_file *m, void *v) | |
f3bcb0e6 | 358 | __releases(&hctx->lock) |
950cd7e9 OS |
359 | { |
360 | struct blk_mq_hw_ctx *hctx = m->private; | |
361 | ||
362 | spin_unlock(&hctx->lock); | |
363 | } | |
364 | ||
365 | static const struct seq_operations hctx_dispatch_seq_ops = { | |
366 | .start = hctx_dispatch_start, | |
367 | .next = hctx_dispatch_next, | |
368 | .stop = hctx_dispatch_stop, | |
369 | .show = blk_mq_debugfs_rq_show, | |
370 | }; | |
371 | ||
2720bab5 BVA |
372 | struct show_busy_params { |
373 | struct seq_file *m; | |
374 | struct blk_mq_hw_ctx *hctx; | |
375 | }; | |
376 | ||
377 | /* | |
378 | * Note: the state of a request may change while this function is in progress, | |
7baa8572 JA |
379 | * e.g. due to a concurrent blk_mq_finish_request() call. Returns true to |
380 | * keep iterating requests. | |
2720bab5 | 381 | */ |
7baa8572 | 382 | static bool hctx_show_busy_rq(struct request *rq, void *data, bool reserved) |
2720bab5 BVA |
383 | { |
384 | const struct show_busy_params *params = data; | |
385 | ||
ea4f995e | 386 | if (rq->mq_hctx == params->hctx) |
b5fc1e8b | 387 | __blk_mq_debugfs_rq_show(params->m, rq); |
7baa8572 JA |
388 | |
389 | return true; | |
2720bab5 BVA |
390 | } |
391 | ||
392 | static int hctx_busy_show(void *data, struct seq_file *m) | |
393 | { | |
394 | struct blk_mq_hw_ctx *hctx = data; | |
395 | struct show_busy_params params = { .m = m, .hctx = hctx }; | |
396 | ||
397 | blk_mq_tagset_busy_iter(hctx->queue->tag_set, hctx_show_busy_rq, | |
398 | ¶ms); | |
399 | ||
400 | return 0; | |
401 | } | |
402 | ||
346fc108 ML |
403 | static const char *const hctx_types[] = { |
404 | [HCTX_TYPE_DEFAULT] = "default", | |
405 | [HCTX_TYPE_READ] = "read", | |
406 | [HCTX_TYPE_POLL] = "poll", | |
407 | }; | |
408 | ||
409 | static int hctx_type_show(void *data, struct seq_file *m) | |
410 | { | |
411 | struct blk_mq_hw_ctx *hctx = data; | |
412 | ||
413 | BUILD_BUG_ON(ARRAY_SIZE(hctx_types) != HCTX_MAX_TYPES); | |
414 | seq_printf(m, "%s\n", hctx_types[hctx->type]); | |
415 | return 0; | |
416 | } | |
417 | ||
f57de23a | 418 | static int hctx_ctx_map_show(void *data, struct seq_file *m) |
0bfa5288 | 419 | { |
f57de23a | 420 | struct blk_mq_hw_ctx *hctx = data; |
0bfa5288 OS |
421 | |
422 | sbitmap_bitmap_show(&hctx->ctx_map, m); | |
423 | return 0; | |
424 | } | |
425 | ||
d96b37c0 OS |
426 | static void blk_mq_debugfs_tags_show(struct seq_file *m, |
427 | struct blk_mq_tags *tags) | |
428 | { | |
429 | seq_printf(m, "nr_tags=%u\n", tags->nr_tags); | |
430 | seq_printf(m, "nr_reserved_tags=%u\n", tags->nr_reserved_tags); | |
431 | seq_printf(m, "active_queues=%d\n", | |
432 | atomic_read(&tags->active_queues)); | |
433 | ||
434 | seq_puts(m, "\nbitmap_tags:\n"); | |
ae0f1a73 | 435 | sbitmap_queue_show(&tags->bitmap_tags, m); |
d96b37c0 OS |
436 | |
437 | if (tags->nr_reserved_tags) { | |
438 | seq_puts(m, "\nbreserved_tags:\n"); | |
ae0f1a73 | 439 | sbitmap_queue_show(&tags->breserved_tags, m); |
d96b37c0 OS |
440 | } |
441 | } | |
442 | ||
f57de23a | 443 | static int hctx_tags_show(void *data, struct seq_file *m) |
d96b37c0 | 444 | { |
f57de23a | 445 | struct blk_mq_hw_ctx *hctx = data; |
d96b37c0 | 446 | struct request_queue *q = hctx->queue; |
8c0f14ea | 447 | int res; |
d96b37c0 | 448 | |
8c0f14ea BVA |
449 | res = mutex_lock_interruptible(&q->sysfs_lock); |
450 | if (res) | |
451 | goto out; | |
d96b37c0 OS |
452 | if (hctx->tags) |
453 | blk_mq_debugfs_tags_show(m, hctx->tags); | |
454 | mutex_unlock(&q->sysfs_lock); | |
455 | ||
8c0f14ea BVA |
456 | out: |
457 | return res; | |
d96b37c0 OS |
458 | } |
459 | ||
f57de23a | 460 | static int hctx_tags_bitmap_show(void *data, struct seq_file *m) |
d7e3621a | 461 | { |
f57de23a | 462 | struct blk_mq_hw_ctx *hctx = data; |
d7e3621a | 463 | struct request_queue *q = hctx->queue; |
8c0f14ea | 464 | int res; |
d7e3621a | 465 | |
8c0f14ea BVA |
466 | res = mutex_lock_interruptible(&q->sysfs_lock); |
467 | if (res) | |
468 | goto out; | |
d7e3621a | 469 | if (hctx->tags) |
ae0f1a73 | 470 | sbitmap_bitmap_show(&hctx->tags->bitmap_tags.sb, m); |
d7e3621a | 471 | mutex_unlock(&q->sysfs_lock); |
8c0f14ea BVA |
472 | |
473 | out: | |
474 | return res; | |
d7e3621a OS |
475 | } |
476 | ||
f57de23a | 477 | static int hctx_sched_tags_show(void *data, struct seq_file *m) |
d96b37c0 | 478 | { |
f57de23a | 479 | struct blk_mq_hw_ctx *hctx = data; |
d96b37c0 | 480 | struct request_queue *q = hctx->queue; |
8c0f14ea | 481 | int res; |
d96b37c0 | 482 | |
8c0f14ea BVA |
483 | res = mutex_lock_interruptible(&q->sysfs_lock); |
484 | if (res) | |
485 | goto out; | |
d96b37c0 OS |
486 | if (hctx->sched_tags) |
487 | blk_mq_debugfs_tags_show(m, hctx->sched_tags); | |
488 | mutex_unlock(&q->sysfs_lock); | |
489 | ||
8c0f14ea BVA |
490 | out: |
491 | return res; | |
d96b37c0 OS |
492 | } |
493 | ||
f57de23a | 494 | static int hctx_sched_tags_bitmap_show(void *data, struct seq_file *m) |
d7e3621a | 495 | { |
f57de23a | 496 | struct blk_mq_hw_ctx *hctx = data; |
d7e3621a | 497 | struct request_queue *q = hctx->queue; |
8c0f14ea | 498 | int res; |
d7e3621a | 499 | |
8c0f14ea BVA |
500 | res = mutex_lock_interruptible(&q->sysfs_lock); |
501 | if (res) | |
502 | goto out; | |
d7e3621a | 503 | if (hctx->sched_tags) |
ae0f1a73 | 504 | sbitmap_bitmap_show(&hctx->sched_tags->bitmap_tags.sb, m); |
d7e3621a | 505 | mutex_unlock(&q->sysfs_lock); |
8c0f14ea BVA |
506 | |
507 | out: | |
508 | return res; | |
d7e3621a OS |
509 | } |
510 | ||
f57de23a | 511 | static int hctx_run_show(void *data, struct seq_file *m) |
4a46f05e | 512 | { |
f57de23a | 513 | struct blk_mq_hw_ctx *hctx = data; |
4a46f05e OS |
514 | |
515 | seq_printf(m, "%lu\n", hctx->run); | |
516 | return 0; | |
517 | } | |
518 | ||
f57de23a OS |
519 | static ssize_t hctx_run_write(void *data, const char __user *buf, size_t count, |
520 | loff_t *ppos) | |
4a46f05e | 521 | { |
f57de23a | 522 | struct blk_mq_hw_ctx *hctx = data; |
4a46f05e OS |
523 | |
524 | hctx->run = 0; | |
525 | return count; | |
526 | } | |
527 | ||
f57de23a | 528 | static int hctx_active_show(void *data, struct seq_file *m) |
4a46f05e | 529 | { |
f57de23a | 530 | struct blk_mq_hw_ctx *hctx = data; |
4a46f05e | 531 | |
9b84c629 | 532 | seq_printf(m, "%d\n", __blk_mq_active_requests(hctx)); |
4a46f05e OS |
533 | return 0; |
534 | } | |
535 | ||
6e768717 ML |
536 | static int hctx_dispatch_busy_show(void *data, struct seq_file *m) |
537 | { | |
538 | struct blk_mq_hw_ctx *hctx = data; | |
539 | ||
540 | seq_printf(m, "%u\n", hctx->dispatch_busy); | |
541 | return 0; | |
542 | } | |
543 | ||
c16d6b5a ML |
544 | #define CTX_RQ_SEQ_OPS(name, type) \ |
545 | static void *ctx_##name##_rq_list_start(struct seq_file *m, loff_t *pos) \ | |
546 | __acquires(&ctx->lock) \ | |
547 | { \ | |
548 | struct blk_mq_ctx *ctx = m->private; \ | |
549 | \ | |
550 | spin_lock(&ctx->lock); \ | |
551 | return seq_list_start(&ctx->rq_lists[type], *pos); \ | |
552 | } \ | |
553 | \ | |
554 | static void *ctx_##name##_rq_list_next(struct seq_file *m, void *v, \ | |
555 | loff_t *pos) \ | |
556 | { \ | |
557 | struct blk_mq_ctx *ctx = m->private; \ | |
558 | \ | |
559 | return seq_list_next(v, &ctx->rq_lists[type], pos); \ | |
560 | } \ | |
561 | \ | |
562 | static void ctx_##name##_rq_list_stop(struct seq_file *m, void *v) \ | |
563 | __releases(&ctx->lock) \ | |
564 | { \ | |
565 | struct blk_mq_ctx *ctx = m->private; \ | |
566 | \ | |
567 | spin_unlock(&ctx->lock); \ | |
568 | } \ | |
569 | \ | |
570 | static const struct seq_operations ctx_##name##_rq_list_seq_ops = { \ | |
571 | .start = ctx_##name##_rq_list_start, \ | |
572 | .next = ctx_##name##_rq_list_next, \ | |
573 | .stop = ctx_##name##_rq_list_stop, \ | |
574 | .show = blk_mq_debugfs_rq_show, \ | |
575 | } | |
576 | ||
577 | CTX_RQ_SEQ_OPS(default, HCTX_TYPE_DEFAULT); | |
578 | CTX_RQ_SEQ_OPS(read, HCTX_TYPE_READ); | |
579 | CTX_RQ_SEQ_OPS(poll, HCTX_TYPE_POLL); | |
950cd7e9 | 580 | |
f57de23a OS |
581 | static int blk_mq_debugfs_show(struct seq_file *m, void *v) |
582 | { | |
583 | const struct blk_mq_debugfs_attr *attr = m->private; | |
584 | void *data = d_inode(m->file->f_path.dentry->d_parent)->i_private; | |
585 | ||
586 | return attr->show(data, m); | |
587 | } | |
588 | ||
589 | static ssize_t blk_mq_debugfs_write(struct file *file, const char __user *buf, | |
590 | size_t count, loff_t *ppos) | |
4a46f05e OS |
591 | { |
592 | struct seq_file *m = file->private_data; | |
f57de23a OS |
593 | const struct blk_mq_debugfs_attr *attr = m->private; |
594 | void *data = d_inode(file->f_path.dentry->d_parent)->i_private; | |
4a46f05e | 595 | |
6b136a24 EG |
596 | /* |
597 | * Attributes that only implement .seq_ops are read-only and 'attr' is | |
598 | * the same with 'data' in this case. | |
599 | */ | |
600 | if (attr == data || !attr->write) | |
f57de23a OS |
601 | return -EPERM; |
602 | ||
603 | return attr->write(data, buf, count, ppos); | |
604 | } | |
605 | ||
606 | static int blk_mq_debugfs_open(struct inode *inode, struct file *file) | |
607 | { | |
608 | const struct blk_mq_debugfs_attr *attr = inode->i_private; | |
609 | void *data = d_inode(file->f_path.dentry->d_parent)->i_private; | |
610 | struct seq_file *m; | |
611 | int ret; | |
612 | ||
613 | if (attr->seq_ops) { | |
614 | ret = seq_open(file, attr->seq_ops); | |
615 | if (!ret) { | |
616 | m = file->private_data; | |
617 | m->private = data; | |
618 | } | |
619 | return ret; | |
620 | } | |
621 | ||
622 | if (WARN_ON_ONCE(!attr->show)) | |
623 | return -EPERM; | |
624 | ||
625 | return single_open(file, blk_mq_debugfs_show, inode->i_private); | |
4a46f05e OS |
626 | } |
627 | ||
f57de23a OS |
628 | static int blk_mq_debugfs_release(struct inode *inode, struct file *file) |
629 | { | |
630 | const struct blk_mq_debugfs_attr *attr = inode->i_private; | |
631 | ||
632 | if (attr->show) | |
633 | return single_release(inode, file); | |
ee1e0359 CK |
634 | |
635 | return seq_release(inode, file); | |
f57de23a OS |
636 | } |
637 | ||
f8465933 | 638 | static const struct file_operations blk_mq_debugfs_fops = { |
f57de23a | 639 | .open = blk_mq_debugfs_open, |
4a46f05e | 640 | .read = seq_read, |
f57de23a | 641 | .write = blk_mq_debugfs_write, |
4a46f05e | 642 | .llseek = seq_lseek, |
f57de23a | 643 | .release = blk_mq_debugfs_release, |
4a46f05e OS |
644 | }; |
645 | ||
07e4fead | 646 | static const struct blk_mq_debugfs_attr blk_mq_debugfs_hctx_attrs[] = { |
f57de23a OS |
647 | {"state", 0400, hctx_state_show}, |
648 | {"flags", 0400, hctx_flags_show}, | |
649 | {"dispatch", 0400, .seq_ops = &hctx_dispatch_seq_ops}, | |
2720bab5 | 650 | {"busy", 0400, hctx_busy_show}, |
f57de23a OS |
651 | {"ctx_map", 0400, hctx_ctx_map_show}, |
652 | {"tags", 0400, hctx_tags_show}, | |
653 | {"tags_bitmap", 0400, hctx_tags_bitmap_show}, | |
654 | {"sched_tags", 0400, hctx_sched_tags_show}, | |
655 | {"sched_tags_bitmap", 0400, hctx_sched_tags_bitmap_show}, | |
f57de23a OS |
656 | {"run", 0600, hctx_run_show, hctx_run_write}, |
657 | {"active", 0400, hctx_active_show}, | |
6e768717 | 658 | {"dispatch_busy", 0400, hctx_dispatch_busy_show}, |
346fc108 | 659 | {"type", 0400, hctx_type_show}, |
72f2f8f6 | 660 | {}, |
07e4fead OS |
661 | }; |
662 | ||
663 | static const struct blk_mq_debugfs_attr blk_mq_debugfs_ctx_attrs[] = { | |
c16d6b5a ML |
664 | {"default_rq_list", 0400, .seq_ops = &ctx_default_rq_list_seq_ops}, |
665 | {"read_rq_list", 0400, .seq_ops = &ctx_read_rq_list_seq_ops}, | |
666 | {"poll_rq_list", 0400, .seq_ops = &ctx_poll_rq_list_seq_ops}, | |
72f2f8f6 | 667 | {}, |
07e4fead OS |
668 | }; |
669 | ||
6cfc0081 | 670 | static void debugfs_create_files(struct dentry *parent, void *data, |
9c1051aa OS |
671 | const struct blk_mq_debugfs_attr *attr) |
672 | { | |
36991ca6 | 673 | if (IS_ERR_OR_NULL(parent)) |
6cfc0081 | 674 | return; |
36991ca6 | 675 | |
9c1051aa OS |
676 | d_inode(parent)->i_private = data; |
677 | ||
6cfc0081 GKH |
678 | for (; attr->name; attr++) |
679 | debugfs_create_file(attr->name, attr->mode, parent, | |
680 | (void *)attr, &blk_mq_debugfs_fops); | |
9c1051aa OS |
681 | } |
682 | ||
6cfc0081 | 683 | void blk_mq_debugfs_register(struct request_queue *q) |
07e4fead | 684 | { |
9c1051aa | 685 | struct blk_mq_hw_ctx *hctx; |
4f481208 | 686 | unsigned long i; |
9c1051aa | 687 | |
6cfc0081 | 688 | debugfs_create_files(q->debugfs_dir, q, blk_mq_debugfs_queue_attrs); |
07e4fead | 689 | |
9c1051aa | 690 | /* |
70e62f4b | 691 | * blk_mq_init_sched() attempted to do this already, but q->debugfs_dir |
9c1051aa OS |
692 | * didn't exist yet (because we don't know what to name the directory |
693 | * until the queue is registered to a gendisk). | |
694 | */ | |
70e62f4b OS |
695 | if (q->elevator && !q->sched_debugfs_dir) |
696 | blk_mq_debugfs_register_sched(q); | |
697 | ||
698 | /* Similarly, blk_mq_init_hctx() couldn't do this previously. */ | |
9c1051aa | 699 | queue_for_each_hw_ctx(q, hctx, i) { |
6cfc0081 GKH |
700 | if (!hctx->debugfs_dir) |
701 | blk_mq_debugfs_register_hctx(q, hctx); | |
702 | if (q->elevator && !hctx->sched_debugfs_dir) | |
703 | blk_mq_debugfs_register_sched_hctx(q, hctx); | |
9c1051aa OS |
704 | } |
705 | ||
cc56694f ML |
706 | if (q->rq_qos) { |
707 | struct rq_qos *rqos = q->rq_qos; | |
708 | ||
709 | while (rqos) { | |
710 | blk_mq_debugfs_register_rqos(rqos); | |
711 | rqos = rqos->next; | |
712 | } | |
713 | } | |
07e4fead OS |
714 | } |
715 | ||
716 | void blk_mq_debugfs_unregister(struct request_queue *q) | |
717 | { | |
d332ce09 | 718 | q->sched_debugfs_dir = NULL; |
07e4fead OS |
719 | } |
720 | ||
6cfc0081 GKH |
721 | static void blk_mq_debugfs_register_ctx(struct blk_mq_hw_ctx *hctx, |
722 | struct blk_mq_ctx *ctx) | |
07e4fead OS |
723 | { |
724 | struct dentry *ctx_dir; | |
725 | char name[20]; | |
07e4fead OS |
726 | |
727 | snprintf(name, sizeof(name), "cpu%u", ctx->cpu); | |
9c1051aa | 728 | ctx_dir = debugfs_create_dir(name, hctx->debugfs_dir); |
07e4fead | 729 | |
6cfc0081 | 730 | debugfs_create_files(ctx_dir, ctx, blk_mq_debugfs_ctx_attrs); |
07e4fead OS |
731 | } |
732 | ||
6cfc0081 GKH |
733 | void blk_mq_debugfs_register_hctx(struct request_queue *q, |
734 | struct blk_mq_hw_ctx *hctx) | |
07e4fead OS |
735 | { |
736 | struct blk_mq_ctx *ctx; | |
07e4fead OS |
737 | char name[20]; |
738 | int i; | |
739 | ||
88aabbd7 | 740 | snprintf(name, sizeof(name), "hctx%u", hctx->queue_num); |
9c1051aa | 741 | hctx->debugfs_dir = debugfs_create_dir(name, q->debugfs_dir); |
07e4fead | 742 | |
6cfc0081 | 743 | debugfs_create_files(hctx->debugfs_dir, hctx, blk_mq_debugfs_hctx_attrs); |
9c1051aa | 744 | |
6cfc0081 GKH |
745 | hctx_for_each_ctx(hctx, ctx, i) |
746 | blk_mq_debugfs_register_ctx(hctx, ctx); | |
9c1051aa OS |
747 | } |
748 | ||
749 | void blk_mq_debugfs_unregister_hctx(struct blk_mq_hw_ctx *hctx) | |
750 | { | |
751 | debugfs_remove_recursive(hctx->debugfs_dir); | |
d332ce09 | 752 | hctx->sched_debugfs_dir = NULL; |
9c1051aa | 753 | hctx->debugfs_dir = NULL; |
07e4fead OS |
754 | } |
755 | ||
6cfc0081 | 756 | void blk_mq_debugfs_register_hctxs(struct request_queue *q) |
07e4fead OS |
757 | { |
758 | struct blk_mq_hw_ctx *hctx; | |
4f481208 | 759 | unsigned long i; |
07e4fead | 760 | |
6cfc0081 GKH |
761 | queue_for_each_hw_ctx(q, hctx, i) |
762 | blk_mq_debugfs_register_hctx(q, hctx); | |
07e4fead OS |
763 | } |
764 | ||
9c1051aa | 765 | void blk_mq_debugfs_unregister_hctxs(struct request_queue *q) |
07e4fead | 766 | { |
9c1051aa | 767 | struct blk_mq_hw_ctx *hctx; |
4f481208 | 768 | unsigned long i; |
9c1051aa OS |
769 | |
770 | queue_for_each_hw_ctx(q, hctx, i) | |
771 | blk_mq_debugfs_unregister_hctx(hctx); | |
07e4fead | 772 | } |
d332ce09 | 773 | |
6cfc0081 | 774 | void blk_mq_debugfs_register_sched(struct request_queue *q) |
d332ce09 OS |
775 | { |
776 | struct elevator_type *e = q->elevator->type; | |
777 | ||
7e41c3c9 GKH |
778 | /* |
779 | * If the parent directory has not been created yet, return, we will be | |
780 | * called again later on and the directory/files will be created then. | |
781 | */ | |
782 | if (!q->debugfs_dir) | |
783 | return; | |
784 | ||
d332ce09 | 785 | if (!e->queue_debugfs_attrs) |
6cfc0081 | 786 | return; |
d332ce09 OS |
787 | |
788 | q->sched_debugfs_dir = debugfs_create_dir("sched", q->debugfs_dir); | |
d332ce09 | 789 | |
6cfc0081 | 790 | debugfs_create_files(q->sched_debugfs_dir, q, e->queue_debugfs_attrs); |
d332ce09 OS |
791 | } |
792 | ||
793 | void blk_mq_debugfs_unregister_sched(struct request_queue *q) | |
794 | { | |
795 | debugfs_remove_recursive(q->sched_debugfs_dir); | |
796 | q->sched_debugfs_dir = NULL; | |
797 | } | |
798 | ||
fb44023e BVA |
799 | static const char *rq_qos_id_to_name(enum rq_qos_id id) |
800 | { | |
801 | switch (id) { | |
802 | case RQ_QOS_WBT: | |
803 | return "wbt"; | |
804 | case RQ_QOS_LATENCY: | |
805 | return "latency"; | |
806 | case RQ_QOS_COST: | |
807 | return "cost"; | |
556910e3 BVA |
808 | case RQ_QOS_IOPRIO: |
809 | return "ioprio"; | |
fb44023e BVA |
810 | } |
811 | return "unknown"; | |
812 | } | |
813 | ||
cc56694f ML |
814 | void blk_mq_debugfs_unregister_rqos(struct rq_qos *rqos) |
815 | { | |
816 | debugfs_remove_recursive(rqos->debugfs_dir); | |
817 | rqos->debugfs_dir = NULL; | |
818 | } | |
819 | ||
6cfc0081 | 820 | void blk_mq_debugfs_register_rqos(struct rq_qos *rqos) |
cc56694f ML |
821 | { |
822 | struct request_queue *q = rqos->q; | |
823 | const char *dir_name = rq_qos_id_to_name(rqos->id); | |
824 | ||
cc56694f | 825 | if (rqos->debugfs_dir || !rqos->ops->debugfs_attrs) |
6cfc0081 | 826 | return; |
cc56694f | 827 | |
6cfc0081 | 828 | if (!q->rqos_debugfs_dir) |
cc56694f ML |
829 | q->rqos_debugfs_dir = debugfs_create_dir("rqos", |
830 | q->debugfs_dir); | |
cc56694f ML |
831 | |
832 | rqos->debugfs_dir = debugfs_create_dir(dir_name, | |
833 | rqos->q->rqos_debugfs_dir); | |
cc56694f | 834 | |
6cfc0081 | 835 | debugfs_create_files(rqos->debugfs_dir, rqos, rqos->ops->debugfs_attrs); |
cc56694f ML |
836 | } |
837 | ||
838 | void blk_mq_debugfs_unregister_queue_rqos(struct request_queue *q) | |
839 | { | |
840 | debugfs_remove_recursive(q->rqos_debugfs_dir); | |
841 | q->rqos_debugfs_dir = NULL; | |
842 | } | |
843 | ||
6cfc0081 GKH |
844 | void blk_mq_debugfs_register_sched_hctx(struct request_queue *q, |
845 | struct blk_mq_hw_ctx *hctx) | |
d332ce09 OS |
846 | { |
847 | struct elevator_type *e = q->elevator->type; | |
848 | ||
1e91e28e S |
849 | /* |
850 | * If the parent debugfs directory has not been created yet, return; | |
851 | * We will be called again later on with appropriate parent debugfs | |
852 | * directory from blk_register_queue() | |
853 | */ | |
854 | if (!hctx->debugfs_dir) | |
855 | return; | |
856 | ||
d332ce09 | 857 | if (!e->hctx_debugfs_attrs) |
6cfc0081 | 858 | return; |
d332ce09 OS |
859 | |
860 | hctx->sched_debugfs_dir = debugfs_create_dir("sched", | |
861 | hctx->debugfs_dir); | |
6cfc0081 GKH |
862 | debugfs_create_files(hctx->sched_debugfs_dir, hctx, |
863 | e->hctx_debugfs_attrs); | |
d332ce09 OS |
864 | } |
865 | ||
866 | void blk_mq_debugfs_unregister_sched_hctx(struct blk_mq_hw_ctx *hctx) | |
867 | { | |
868 | debugfs_remove_recursive(hctx->sched_debugfs_dir); | |
869 | hctx->sched_debugfs_dir = NULL; | |
870 | } |