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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), | |
1a435111 OS |
116 | QUEUE_FLAG_NAME(NOXMERGES), |
117 | QUEUE_FLAG_NAME(ADD_RANDOM), | |
1a435111 | 118 | QUEUE_FLAG_NAME(SAME_FORCE), |
1a435111 | 119 | QUEUE_FLAG_NAME(INIT_DONE), |
1cb039f3 | 120 | QUEUE_FLAG_NAME(STABLE_WRITES), |
1a435111 OS |
121 | QUEUE_FLAG_NAME(POLL), |
122 | QUEUE_FLAG_NAME(WC), | |
123 | QUEUE_FLAG_NAME(FUA), | |
1a435111 OS |
124 | QUEUE_FLAG_NAME(DAX), |
125 | QUEUE_FLAG_NAME(STATS), | |
1a435111 | 126 | QUEUE_FLAG_NAME(REGISTERED), |
22d53821 | 127 | QUEUE_FLAG_NAME(QUIESCED), |
bfe373f6 HT |
128 | QUEUE_FLAG_NAME(PCI_P2PDMA), |
129 | QUEUE_FLAG_NAME(ZONE_RESETALL), | |
130 | QUEUE_FLAG_NAME(RQ_ALLOC_TIME), | |
1dbdd99b | 131 | QUEUE_FLAG_NAME(HCTX_ACTIVE), |
dc304326 | 132 | QUEUE_FLAG_NAME(NOWAIT), |
91d68905 | 133 | }; |
1a435111 | 134 | #undef QUEUE_FLAG_NAME |
91d68905 | 135 | |
f57de23a | 136 | static int queue_state_show(void *data, struct seq_file *m) |
91d68905 | 137 | { |
f57de23a | 138 | struct request_queue *q = data; |
91d68905 BVA |
139 | |
140 | blk_flags_show(m, q->queue_flags, blk_queue_flag_name, | |
141 | ARRAY_SIZE(blk_queue_flag_name)); | |
fd07dc81 | 142 | seq_puts(m, "\n"); |
91d68905 BVA |
143 | return 0; |
144 | } | |
145 | ||
f57de23a OS |
146 | static ssize_t queue_state_write(void *data, const char __user *buf, |
147 | size_t count, loff_t *ppos) | |
91d68905 | 148 | { |
f57de23a | 149 | struct request_queue *q = data; |
71b90511 | 150 | char opbuf[16] = { }, *op; |
91d68905 | 151 | |
18d4d7d0 | 152 | /* |
1f90307e CH |
153 | * The "state" attribute is removed when the queue is removed. Don't |
154 | * allow setting the state on a dying queue to avoid a use-after-free. | |
18d4d7d0 | 155 | */ |
1f90307e | 156 | if (blk_queue_dying(q)) |
18d4d7d0 BVA |
157 | return -ENOENT; |
158 | ||
71b90511 | 159 | if (count >= sizeof(opbuf)) { |
c7e4145a OS |
160 | pr_err("%s: operation too long\n", __func__); |
161 | goto inval; | |
162 | } | |
163 | ||
71b90511 | 164 | if (copy_from_user(opbuf, buf, count)) |
91d68905 | 165 | return -EFAULT; |
71b90511 | 166 | op = strstrip(opbuf); |
91d68905 BVA |
167 | if (strcmp(op, "run") == 0) { |
168 | blk_mq_run_hw_queues(q, true); | |
169 | } else if (strcmp(op, "start") == 0) { | |
170 | blk_mq_start_stopped_hw_queues(q, true); | |
edea55ab BVA |
171 | } else if (strcmp(op, "kick") == 0) { |
172 | blk_mq_kick_requeue_list(q); | |
91d68905 | 173 | } else { |
c7e4145a OS |
174 | pr_err("%s: unsupported operation '%s'\n", __func__, op); |
175 | inval: | |
edea55ab | 176 | pr_err("%s: use 'run', 'start' or 'kick'\n", __func__); |
91d68905 BVA |
177 | return -EINVAL; |
178 | } | |
c7e4145a | 179 | return count; |
91d68905 BVA |
180 | } |
181 | ||
1209cb7f BVA |
182 | static const struct blk_mq_debugfs_attr blk_mq_debugfs_queue_attrs[] = { |
183 | { "poll_stat", 0400, queue_poll_stat_show }, | |
184 | { "requeue_list", 0400, .seq_ops = &queue_requeue_list_seq_ops }, | |
cd84a62e | 185 | { "pm_only", 0600, queue_pm_only_show, NULL }, |
1209cb7f | 186 | { "state", 0600, queue_state_show, queue_state_write }, |
18bc4230 | 187 | { "zone_wlock", 0400, queue_zone_wlock_show, NULL }, |
1209cb7f BVA |
188 | { }, |
189 | }; | |
34dbad5d | 190 | |
1a435111 | 191 | #define HCTX_STATE_NAME(name) [BLK_MQ_S_##name] = #name |
f5c0b091 | 192 | static const char *const hctx_state_name[] = { |
1a435111 OS |
193 | HCTX_STATE_NAME(STOPPED), |
194 | HCTX_STATE_NAME(TAG_ACTIVE), | |
195 | HCTX_STATE_NAME(SCHED_RESTART), | |
bf0beec0 | 196 | HCTX_STATE_NAME(INACTIVE), |
f5c0b091 | 197 | }; |
1a435111 OS |
198 | #undef HCTX_STATE_NAME |
199 | ||
f57de23a | 200 | static int hctx_state_show(void *data, struct seq_file *m) |
9abb2ad2 | 201 | { |
f57de23a | 202 | struct blk_mq_hw_ctx *hctx = data; |
9abb2ad2 | 203 | |
f5c0b091 BVA |
204 | blk_flags_show(m, hctx->state, hctx_state_name, |
205 | ARRAY_SIZE(hctx_state_name)); | |
fd07dc81 | 206 | seq_puts(m, "\n"); |
9abb2ad2 OS |
207 | return 0; |
208 | } | |
209 | ||
1a435111 | 210 | #define BLK_TAG_ALLOC_NAME(name) [BLK_TAG_ALLOC_##name] = #name |
f5c0b091 | 211 | static const char *const alloc_policy_name[] = { |
1a435111 OS |
212 | BLK_TAG_ALLOC_NAME(FIFO), |
213 | BLK_TAG_ALLOC_NAME(RR), | |
f5c0b091 | 214 | }; |
1a435111 | 215 | #undef BLK_TAG_ALLOC_NAME |
f5c0b091 | 216 | |
1a435111 | 217 | #define HCTX_FLAG_NAME(name) [ilog2(BLK_MQ_F_##name)] = #name |
f5c0b091 | 218 | static const char *const hctx_flag_name[] = { |
1a435111 | 219 | HCTX_FLAG_NAME(SHOULD_MERGE), |
51db1c37 | 220 | HCTX_FLAG_NAME(TAG_QUEUE_SHARED), |
1a435111 OS |
221 | HCTX_FLAG_NAME(BLOCKING), |
222 | HCTX_FLAG_NAME(NO_SCHED), | |
bf0beec0 | 223 | HCTX_FLAG_NAME(STACKING), |
02f938e9 | 224 | HCTX_FLAG_NAME(TAG_HCTX_SHARED), |
f5c0b091 | 225 | }; |
1a435111 | 226 | #undef HCTX_FLAG_NAME |
f5c0b091 | 227 | |
f57de23a | 228 | static int hctx_flags_show(void *data, struct seq_file *m) |
9abb2ad2 | 229 | { |
f57de23a | 230 | struct blk_mq_hw_ctx *hctx = data; |
f5c0b091 | 231 | const int alloc_policy = BLK_MQ_FLAG_TO_ALLOC_POLICY(hctx->flags); |
9abb2ad2 | 232 | |
f5c0b091 BVA |
233 | seq_puts(m, "alloc_policy="); |
234 | if (alloc_policy < ARRAY_SIZE(alloc_policy_name) && | |
235 | alloc_policy_name[alloc_policy]) | |
236 | seq_puts(m, alloc_policy_name[alloc_policy]); | |
237 | else | |
238 | seq_printf(m, "%d", alloc_policy); | |
239 | seq_puts(m, " "); | |
240 | blk_flags_show(m, | |
241 | hctx->flags ^ BLK_ALLOC_POLICY_TO_MQ_FLAG(alloc_policy), | |
242 | hctx_flag_name, ARRAY_SIZE(hctx_flag_name)); | |
fd07dc81 | 243 | seq_puts(m, "\n"); |
9abb2ad2 OS |
244 | return 0; |
245 | } | |
246 | ||
1a435111 | 247 | #define CMD_FLAG_NAME(name) [__REQ_##name] = #name |
8658dca8 | 248 | static const char *const cmd_flag_name[] = { |
1a435111 OS |
249 | CMD_FLAG_NAME(FAILFAST_DEV), |
250 | CMD_FLAG_NAME(FAILFAST_TRANSPORT), | |
251 | CMD_FLAG_NAME(FAILFAST_DRIVER), | |
252 | CMD_FLAG_NAME(SYNC), | |
253 | CMD_FLAG_NAME(META), | |
254 | CMD_FLAG_NAME(PRIO), | |
255 | CMD_FLAG_NAME(NOMERGE), | |
256 | CMD_FLAG_NAME(IDLE), | |
257 | CMD_FLAG_NAME(INTEGRITY), | |
258 | CMD_FLAG_NAME(FUA), | |
259 | CMD_FLAG_NAME(PREFLUSH), | |
260 | CMD_FLAG_NAME(RAHEAD), | |
261 | CMD_FLAG_NAME(BACKGROUND), | |
22d53821 | 262 | CMD_FLAG_NAME(NOWAIT), |
1c26010c | 263 | CMD_FLAG_NAME(NOUNMAP), |
6ce913fe | 264 | CMD_FLAG_NAME(POLLED), |
8658dca8 | 265 | }; |
1a435111 | 266 | #undef CMD_FLAG_NAME |
8658dca8 | 267 | |
1a435111 | 268 | #define RQF_NAME(name) [ilog2((__force u32)RQF_##name)] = #name |
8658dca8 | 269 | static const char *const rqf_name[] = { |
85ba3eff | 270 | RQF_NAME(STARTED), |
1a435111 OS |
271 | RQF_NAME(SOFTBARRIER), |
272 | RQF_NAME(FLUSH_SEQ), | |
273 | RQF_NAME(MIXED_MERGE), | |
274 | RQF_NAME(MQ_INFLIGHT), | |
275 | RQF_NAME(DONTPREP), | |
1a435111 OS |
276 | RQF_NAME(FAILED), |
277 | RQF_NAME(QUIET), | |
278 | RQF_NAME(ELVPRIV), | |
279 | RQF_NAME(IO_STAT), | |
1a435111 OS |
280 | RQF_NAME(PM), |
281 | RQF_NAME(HASHED), | |
282 | RQF_NAME(STATS), | |
283 | RQF_NAME(SPECIAL_PAYLOAD), | |
5d75d3f2 | 284 | RQF_NAME(ZONE_WRITE_LOCKED), |
76a86f9d | 285 | RQF_NAME(MQ_POLL_SLEPT), |
62ba0c00 | 286 | RQF_NAME(ELV), |
8658dca8 | 287 | }; |
1a435111 | 288 | #undef RQF_NAME |
8658dca8 | 289 | |
ec6dcf63 BVA |
290 | static const char *const blk_mq_rq_state_name_array[] = { |
291 | [MQ_RQ_IDLE] = "idle", | |
292 | [MQ_RQ_IN_FLIGHT] = "in_flight", | |
293 | [MQ_RQ_COMPLETE] = "complete", | |
294 | }; | |
295 | ||
296 | static const char *blk_mq_rq_state_name(enum mq_rq_state rq_state) | |
297 | { | |
a1e79188 | 298 | if (WARN_ON_ONCE((unsigned int)rq_state >= |
ec6dcf63 BVA |
299 | ARRAY_SIZE(blk_mq_rq_state_name_array))) |
300 | return "(?)"; | |
301 | return blk_mq_rq_state_name_array[rq_state]; | |
302 | } | |
303 | ||
daaadb3e | 304 | int __blk_mq_debugfs_rq_show(struct seq_file *m, struct request *rq) |
950cd7e9 | 305 | { |
2836ee4b | 306 | const struct blk_mq_ops *const mq_ops = rq->q->mq_ops; |
77e7ffd7 | 307 | const enum req_op op = req_op(rq); |
874c893b | 308 | const char *op_str = blk_op_str(op); |
950cd7e9 | 309 | |
8658dca8 | 310 | seq_printf(m, "%p {.op=", rq); |
874c893b | 311 | if (strcmp(op_str, "UNKNOWN") == 0) |
3f6d385f | 312 | seq_printf(m, "%u", op); |
8658dca8 | 313 | else |
874c893b | 314 | seq_printf(m, "%s", op_str); |
8658dca8 | 315 | seq_puts(m, ", .cmd_flags="); |
16458cf3 BVA |
316 | blk_flags_show(m, (__force unsigned int)(rq->cmd_flags & ~REQ_OP_MASK), |
317 | cmd_flag_name, ARRAY_SIZE(cmd_flag_name)); | |
8658dca8 BVA |
318 | seq_puts(m, ", .rq_flags="); |
319 | blk_flags_show(m, (__force unsigned int)rq->rq_flags, rqf_name, | |
320 | ARRAY_SIZE(rqf_name)); | |
ec6dcf63 | 321 | seq_printf(m, ", .state=%s", blk_mq_rq_state_name(blk_mq_rq_state(rq))); |
2836ee4b | 322 | seq_printf(m, ", .tag=%d, .internal_tag=%d", rq->tag, |
8658dca8 | 323 | rq->internal_tag); |
2836ee4b BVA |
324 | if (mq_ops->show_rq) |
325 | mq_ops->show_rq(m, rq); | |
326 | seq_puts(m, "}\n"); | |
950cd7e9 OS |
327 | return 0; |
328 | } | |
daaadb3e OS |
329 | EXPORT_SYMBOL_GPL(__blk_mq_debugfs_rq_show); |
330 | ||
331 | int blk_mq_debugfs_rq_show(struct seq_file *m, void *v) | |
332 | { | |
333 | return __blk_mq_debugfs_rq_show(m, list_entry_rq(v)); | |
334 | } | |
16b738f6 | 335 | EXPORT_SYMBOL_GPL(blk_mq_debugfs_rq_show); |
950cd7e9 OS |
336 | |
337 | static void *hctx_dispatch_start(struct seq_file *m, loff_t *pos) | |
f3bcb0e6 | 338 | __acquires(&hctx->lock) |
950cd7e9 OS |
339 | { |
340 | struct blk_mq_hw_ctx *hctx = m->private; | |
341 | ||
342 | spin_lock(&hctx->lock); | |
343 | return seq_list_start(&hctx->dispatch, *pos); | |
344 | } | |
345 | ||
346 | static void *hctx_dispatch_next(struct seq_file *m, void *v, loff_t *pos) | |
347 | { | |
348 | struct blk_mq_hw_ctx *hctx = m->private; | |
349 | ||
350 | return seq_list_next(v, &hctx->dispatch, pos); | |
351 | } | |
352 | ||
353 | static void hctx_dispatch_stop(struct seq_file *m, void *v) | |
f3bcb0e6 | 354 | __releases(&hctx->lock) |
950cd7e9 OS |
355 | { |
356 | struct blk_mq_hw_ctx *hctx = m->private; | |
357 | ||
358 | spin_unlock(&hctx->lock); | |
359 | } | |
360 | ||
361 | static const struct seq_operations hctx_dispatch_seq_ops = { | |
362 | .start = hctx_dispatch_start, | |
363 | .next = hctx_dispatch_next, | |
364 | .stop = hctx_dispatch_stop, | |
365 | .show = blk_mq_debugfs_rq_show, | |
366 | }; | |
367 | ||
2720bab5 BVA |
368 | struct show_busy_params { |
369 | struct seq_file *m; | |
370 | struct blk_mq_hw_ctx *hctx; | |
371 | }; | |
372 | ||
373 | /* | |
374 | * Note: the state of a request may change while this function is in progress, | |
7baa8572 JA |
375 | * e.g. due to a concurrent blk_mq_finish_request() call. Returns true to |
376 | * keep iterating requests. | |
2720bab5 | 377 | */ |
2dd6532e | 378 | static bool hctx_show_busy_rq(struct request *rq, void *data) |
2720bab5 BVA |
379 | { |
380 | const struct show_busy_params *params = data; | |
381 | ||
ea4f995e | 382 | if (rq->mq_hctx == params->hctx) |
b5fc1e8b | 383 | __blk_mq_debugfs_rq_show(params->m, rq); |
7baa8572 JA |
384 | |
385 | return true; | |
2720bab5 BVA |
386 | } |
387 | ||
388 | static int hctx_busy_show(void *data, struct seq_file *m) | |
389 | { | |
390 | struct blk_mq_hw_ctx *hctx = data; | |
391 | struct show_busy_params params = { .m = m, .hctx = hctx }; | |
392 | ||
393 | blk_mq_tagset_busy_iter(hctx->queue->tag_set, hctx_show_busy_rq, | |
394 | ¶ms); | |
395 | ||
396 | return 0; | |
397 | } | |
398 | ||
346fc108 ML |
399 | static const char *const hctx_types[] = { |
400 | [HCTX_TYPE_DEFAULT] = "default", | |
401 | [HCTX_TYPE_READ] = "read", | |
402 | [HCTX_TYPE_POLL] = "poll", | |
403 | }; | |
404 | ||
405 | static int hctx_type_show(void *data, struct seq_file *m) | |
406 | { | |
407 | struct blk_mq_hw_ctx *hctx = data; | |
408 | ||
409 | BUILD_BUG_ON(ARRAY_SIZE(hctx_types) != HCTX_MAX_TYPES); | |
410 | seq_printf(m, "%s\n", hctx_types[hctx->type]); | |
411 | return 0; | |
412 | } | |
413 | ||
f57de23a | 414 | static int hctx_ctx_map_show(void *data, struct seq_file *m) |
0bfa5288 | 415 | { |
f57de23a | 416 | struct blk_mq_hw_ctx *hctx = data; |
0bfa5288 OS |
417 | |
418 | sbitmap_bitmap_show(&hctx->ctx_map, m); | |
419 | return 0; | |
420 | } | |
421 | ||
d96b37c0 OS |
422 | static void blk_mq_debugfs_tags_show(struct seq_file *m, |
423 | struct blk_mq_tags *tags) | |
424 | { | |
425 | seq_printf(m, "nr_tags=%u\n", tags->nr_tags); | |
426 | seq_printf(m, "nr_reserved_tags=%u\n", tags->nr_reserved_tags); | |
427 | seq_printf(m, "active_queues=%d\n", | |
428 | atomic_read(&tags->active_queues)); | |
429 | ||
430 | seq_puts(m, "\nbitmap_tags:\n"); | |
ae0f1a73 | 431 | sbitmap_queue_show(&tags->bitmap_tags, m); |
d96b37c0 OS |
432 | |
433 | if (tags->nr_reserved_tags) { | |
434 | seq_puts(m, "\nbreserved_tags:\n"); | |
ae0f1a73 | 435 | sbitmap_queue_show(&tags->breserved_tags, m); |
d96b37c0 OS |
436 | } |
437 | } | |
438 | ||
f57de23a | 439 | static int hctx_tags_show(void *data, struct seq_file *m) |
d96b37c0 | 440 | { |
f57de23a | 441 | struct blk_mq_hw_ctx *hctx = data; |
d96b37c0 | 442 | struct request_queue *q = hctx->queue; |
8c0f14ea | 443 | int res; |
d96b37c0 | 444 | |
8c0f14ea BVA |
445 | res = mutex_lock_interruptible(&q->sysfs_lock); |
446 | if (res) | |
447 | goto out; | |
d96b37c0 OS |
448 | if (hctx->tags) |
449 | blk_mq_debugfs_tags_show(m, hctx->tags); | |
450 | mutex_unlock(&q->sysfs_lock); | |
451 | ||
8c0f14ea BVA |
452 | out: |
453 | return res; | |
d96b37c0 OS |
454 | } |
455 | ||
f57de23a | 456 | static int hctx_tags_bitmap_show(void *data, struct seq_file *m) |
d7e3621a | 457 | { |
f57de23a | 458 | struct blk_mq_hw_ctx *hctx = data; |
d7e3621a | 459 | struct request_queue *q = hctx->queue; |
8c0f14ea | 460 | int res; |
d7e3621a | 461 | |
8c0f14ea BVA |
462 | res = mutex_lock_interruptible(&q->sysfs_lock); |
463 | if (res) | |
464 | goto out; | |
d7e3621a | 465 | if (hctx->tags) |
ae0f1a73 | 466 | sbitmap_bitmap_show(&hctx->tags->bitmap_tags.sb, m); |
d7e3621a | 467 | mutex_unlock(&q->sysfs_lock); |
8c0f14ea BVA |
468 | |
469 | out: | |
470 | return res; | |
d7e3621a OS |
471 | } |
472 | ||
f57de23a | 473 | static int hctx_sched_tags_show(void *data, struct seq_file *m) |
d96b37c0 | 474 | { |
f57de23a | 475 | struct blk_mq_hw_ctx *hctx = data; |
d96b37c0 | 476 | struct request_queue *q = hctx->queue; |
8c0f14ea | 477 | int res; |
d96b37c0 | 478 | |
8c0f14ea BVA |
479 | res = mutex_lock_interruptible(&q->sysfs_lock); |
480 | if (res) | |
481 | goto out; | |
d96b37c0 OS |
482 | if (hctx->sched_tags) |
483 | blk_mq_debugfs_tags_show(m, hctx->sched_tags); | |
484 | mutex_unlock(&q->sysfs_lock); | |
485 | ||
8c0f14ea BVA |
486 | out: |
487 | return res; | |
d96b37c0 OS |
488 | } |
489 | ||
f57de23a | 490 | static int hctx_sched_tags_bitmap_show(void *data, struct seq_file *m) |
d7e3621a | 491 | { |
f57de23a | 492 | struct blk_mq_hw_ctx *hctx = data; |
d7e3621a | 493 | struct request_queue *q = hctx->queue; |
8c0f14ea | 494 | int res; |
d7e3621a | 495 | |
8c0f14ea BVA |
496 | res = mutex_lock_interruptible(&q->sysfs_lock); |
497 | if (res) | |
498 | goto out; | |
d7e3621a | 499 | if (hctx->sched_tags) |
ae0f1a73 | 500 | sbitmap_bitmap_show(&hctx->sched_tags->bitmap_tags.sb, m); |
d7e3621a | 501 | mutex_unlock(&q->sysfs_lock); |
8c0f14ea BVA |
502 | |
503 | out: | |
504 | return res; | |
d7e3621a OS |
505 | } |
506 | ||
f57de23a | 507 | static int hctx_run_show(void *data, struct seq_file *m) |
4a46f05e | 508 | { |
f57de23a | 509 | struct blk_mq_hw_ctx *hctx = data; |
4a46f05e OS |
510 | |
511 | seq_printf(m, "%lu\n", hctx->run); | |
512 | return 0; | |
513 | } | |
514 | ||
f57de23a OS |
515 | static ssize_t hctx_run_write(void *data, const char __user *buf, size_t count, |
516 | loff_t *ppos) | |
4a46f05e | 517 | { |
f57de23a | 518 | struct blk_mq_hw_ctx *hctx = data; |
4a46f05e OS |
519 | |
520 | hctx->run = 0; | |
521 | return count; | |
522 | } | |
523 | ||
f57de23a | 524 | static int hctx_active_show(void *data, struct seq_file *m) |
4a46f05e | 525 | { |
f57de23a | 526 | struct blk_mq_hw_ctx *hctx = data; |
4a46f05e | 527 | |
9b84c629 | 528 | seq_printf(m, "%d\n", __blk_mq_active_requests(hctx)); |
4a46f05e OS |
529 | return 0; |
530 | } | |
531 | ||
6e768717 ML |
532 | static int hctx_dispatch_busy_show(void *data, struct seq_file *m) |
533 | { | |
534 | struct blk_mq_hw_ctx *hctx = data; | |
535 | ||
536 | seq_printf(m, "%u\n", hctx->dispatch_busy); | |
537 | return 0; | |
538 | } | |
539 | ||
c16d6b5a ML |
540 | #define CTX_RQ_SEQ_OPS(name, type) \ |
541 | static void *ctx_##name##_rq_list_start(struct seq_file *m, loff_t *pos) \ | |
542 | __acquires(&ctx->lock) \ | |
543 | { \ | |
544 | struct blk_mq_ctx *ctx = m->private; \ | |
545 | \ | |
546 | spin_lock(&ctx->lock); \ | |
547 | return seq_list_start(&ctx->rq_lists[type], *pos); \ | |
548 | } \ | |
549 | \ | |
550 | static void *ctx_##name##_rq_list_next(struct seq_file *m, void *v, \ | |
551 | loff_t *pos) \ | |
552 | { \ | |
553 | struct blk_mq_ctx *ctx = m->private; \ | |
554 | \ | |
555 | return seq_list_next(v, &ctx->rq_lists[type], pos); \ | |
556 | } \ | |
557 | \ | |
558 | static void ctx_##name##_rq_list_stop(struct seq_file *m, void *v) \ | |
559 | __releases(&ctx->lock) \ | |
560 | { \ | |
561 | struct blk_mq_ctx *ctx = m->private; \ | |
562 | \ | |
563 | spin_unlock(&ctx->lock); \ | |
564 | } \ | |
565 | \ | |
566 | static const struct seq_operations ctx_##name##_rq_list_seq_ops = { \ | |
567 | .start = ctx_##name##_rq_list_start, \ | |
568 | .next = ctx_##name##_rq_list_next, \ | |
569 | .stop = ctx_##name##_rq_list_stop, \ | |
570 | .show = blk_mq_debugfs_rq_show, \ | |
571 | } | |
572 | ||
573 | CTX_RQ_SEQ_OPS(default, HCTX_TYPE_DEFAULT); | |
574 | CTX_RQ_SEQ_OPS(read, HCTX_TYPE_READ); | |
575 | CTX_RQ_SEQ_OPS(poll, HCTX_TYPE_POLL); | |
950cd7e9 | 576 | |
f57de23a OS |
577 | static int blk_mq_debugfs_show(struct seq_file *m, void *v) |
578 | { | |
579 | const struct blk_mq_debugfs_attr *attr = m->private; | |
580 | void *data = d_inode(m->file->f_path.dentry->d_parent)->i_private; | |
581 | ||
582 | return attr->show(data, m); | |
583 | } | |
584 | ||
585 | static ssize_t blk_mq_debugfs_write(struct file *file, const char __user *buf, | |
586 | size_t count, loff_t *ppos) | |
4a46f05e OS |
587 | { |
588 | struct seq_file *m = file->private_data; | |
f57de23a OS |
589 | const struct blk_mq_debugfs_attr *attr = m->private; |
590 | void *data = d_inode(file->f_path.dentry->d_parent)->i_private; | |
4a46f05e | 591 | |
6b136a24 EG |
592 | /* |
593 | * Attributes that only implement .seq_ops are read-only and 'attr' is | |
594 | * the same with 'data' in this case. | |
595 | */ | |
596 | if (attr == data || !attr->write) | |
f57de23a OS |
597 | return -EPERM; |
598 | ||
599 | return attr->write(data, buf, count, ppos); | |
600 | } | |
601 | ||
602 | static int blk_mq_debugfs_open(struct inode *inode, struct file *file) | |
603 | { | |
604 | const struct blk_mq_debugfs_attr *attr = inode->i_private; | |
605 | void *data = d_inode(file->f_path.dentry->d_parent)->i_private; | |
606 | struct seq_file *m; | |
607 | int ret; | |
608 | ||
609 | if (attr->seq_ops) { | |
610 | ret = seq_open(file, attr->seq_ops); | |
611 | if (!ret) { | |
612 | m = file->private_data; | |
613 | m->private = data; | |
614 | } | |
615 | return ret; | |
616 | } | |
617 | ||
618 | if (WARN_ON_ONCE(!attr->show)) | |
619 | return -EPERM; | |
620 | ||
621 | return single_open(file, blk_mq_debugfs_show, inode->i_private); | |
4a46f05e OS |
622 | } |
623 | ||
f57de23a OS |
624 | static int blk_mq_debugfs_release(struct inode *inode, struct file *file) |
625 | { | |
626 | const struct blk_mq_debugfs_attr *attr = inode->i_private; | |
627 | ||
628 | if (attr->show) | |
629 | return single_release(inode, file); | |
ee1e0359 CK |
630 | |
631 | return seq_release(inode, file); | |
f57de23a OS |
632 | } |
633 | ||
f8465933 | 634 | static const struct file_operations blk_mq_debugfs_fops = { |
f57de23a | 635 | .open = blk_mq_debugfs_open, |
4a46f05e | 636 | .read = seq_read, |
f57de23a | 637 | .write = blk_mq_debugfs_write, |
4a46f05e | 638 | .llseek = seq_lseek, |
f57de23a | 639 | .release = blk_mq_debugfs_release, |
4a46f05e OS |
640 | }; |
641 | ||
07e4fead | 642 | static const struct blk_mq_debugfs_attr blk_mq_debugfs_hctx_attrs[] = { |
f57de23a OS |
643 | {"state", 0400, hctx_state_show}, |
644 | {"flags", 0400, hctx_flags_show}, | |
645 | {"dispatch", 0400, .seq_ops = &hctx_dispatch_seq_ops}, | |
2720bab5 | 646 | {"busy", 0400, hctx_busy_show}, |
f57de23a OS |
647 | {"ctx_map", 0400, hctx_ctx_map_show}, |
648 | {"tags", 0400, hctx_tags_show}, | |
649 | {"tags_bitmap", 0400, hctx_tags_bitmap_show}, | |
650 | {"sched_tags", 0400, hctx_sched_tags_show}, | |
651 | {"sched_tags_bitmap", 0400, hctx_sched_tags_bitmap_show}, | |
f57de23a OS |
652 | {"run", 0600, hctx_run_show, hctx_run_write}, |
653 | {"active", 0400, hctx_active_show}, | |
6e768717 | 654 | {"dispatch_busy", 0400, hctx_dispatch_busy_show}, |
346fc108 | 655 | {"type", 0400, hctx_type_show}, |
72f2f8f6 | 656 | {}, |
07e4fead OS |
657 | }; |
658 | ||
659 | static const struct blk_mq_debugfs_attr blk_mq_debugfs_ctx_attrs[] = { | |
c16d6b5a ML |
660 | {"default_rq_list", 0400, .seq_ops = &ctx_default_rq_list_seq_ops}, |
661 | {"read_rq_list", 0400, .seq_ops = &ctx_read_rq_list_seq_ops}, | |
662 | {"poll_rq_list", 0400, .seq_ops = &ctx_poll_rq_list_seq_ops}, | |
72f2f8f6 | 663 | {}, |
07e4fead OS |
664 | }; |
665 | ||
6cfc0081 | 666 | static void debugfs_create_files(struct dentry *parent, void *data, |
9c1051aa OS |
667 | const struct blk_mq_debugfs_attr *attr) |
668 | { | |
36991ca6 | 669 | if (IS_ERR_OR_NULL(parent)) |
6cfc0081 | 670 | return; |
36991ca6 | 671 | |
9c1051aa OS |
672 | d_inode(parent)->i_private = data; |
673 | ||
6cfc0081 GKH |
674 | for (; attr->name; attr++) |
675 | debugfs_create_file(attr->name, attr->mode, parent, | |
676 | (void *)attr, &blk_mq_debugfs_fops); | |
9c1051aa OS |
677 | } |
678 | ||
6cfc0081 | 679 | void blk_mq_debugfs_register(struct request_queue *q) |
07e4fead | 680 | { |
9c1051aa | 681 | struct blk_mq_hw_ctx *hctx; |
4f481208 | 682 | unsigned long i; |
9c1051aa | 683 | |
6cfc0081 | 684 | debugfs_create_files(q->debugfs_dir, q, blk_mq_debugfs_queue_attrs); |
07e4fead | 685 | |
9c1051aa | 686 | /* |
70e62f4b | 687 | * blk_mq_init_sched() attempted to do this already, but q->debugfs_dir |
9c1051aa OS |
688 | * didn't exist yet (because we don't know what to name the directory |
689 | * until the queue is registered to a gendisk). | |
690 | */ | |
70e62f4b OS |
691 | if (q->elevator && !q->sched_debugfs_dir) |
692 | blk_mq_debugfs_register_sched(q); | |
693 | ||
694 | /* Similarly, blk_mq_init_hctx() couldn't do this previously. */ | |
9c1051aa | 695 | queue_for_each_hw_ctx(q, hctx, i) { |
6cfc0081 GKH |
696 | if (!hctx->debugfs_dir) |
697 | blk_mq_debugfs_register_hctx(q, hctx); | |
698 | if (q->elevator && !hctx->sched_debugfs_dir) | |
699 | blk_mq_debugfs_register_sched_hctx(q, hctx); | |
9c1051aa OS |
700 | } |
701 | ||
cc56694f ML |
702 | if (q->rq_qos) { |
703 | struct rq_qos *rqos = q->rq_qos; | |
704 | ||
705 | while (rqos) { | |
706 | blk_mq_debugfs_register_rqos(rqos); | |
707 | rqos = rqos->next; | |
708 | } | |
709 | } | |
07e4fead OS |
710 | } |
711 | ||
6cfc0081 GKH |
712 | static void blk_mq_debugfs_register_ctx(struct blk_mq_hw_ctx *hctx, |
713 | struct blk_mq_ctx *ctx) | |
07e4fead OS |
714 | { |
715 | struct dentry *ctx_dir; | |
716 | char name[20]; | |
07e4fead OS |
717 | |
718 | snprintf(name, sizeof(name), "cpu%u", ctx->cpu); | |
9c1051aa | 719 | ctx_dir = debugfs_create_dir(name, hctx->debugfs_dir); |
07e4fead | 720 | |
6cfc0081 | 721 | debugfs_create_files(ctx_dir, ctx, blk_mq_debugfs_ctx_attrs); |
07e4fead OS |
722 | } |
723 | ||
6cfc0081 GKH |
724 | void blk_mq_debugfs_register_hctx(struct request_queue *q, |
725 | struct blk_mq_hw_ctx *hctx) | |
07e4fead OS |
726 | { |
727 | struct blk_mq_ctx *ctx; | |
07e4fead OS |
728 | char name[20]; |
729 | int i; | |
730 | ||
f3ec5d11 ML |
731 | if (!q->debugfs_dir) |
732 | return; | |
733 | ||
88aabbd7 | 734 | snprintf(name, sizeof(name), "hctx%u", hctx->queue_num); |
9c1051aa | 735 | hctx->debugfs_dir = debugfs_create_dir(name, q->debugfs_dir); |
07e4fead | 736 | |
6cfc0081 | 737 | debugfs_create_files(hctx->debugfs_dir, hctx, blk_mq_debugfs_hctx_attrs); |
9c1051aa | 738 | |
6cfc0081 GKH |
739 | hctx_for_each_ctx(hctx, ctx, i) |
740 | blk_mq_debugfs_register_ctx(hctx, ctx); | |
9c1051aa OS |
741 | } |
742 | ||
743 | void blk_mq_debugfs_unregister_hctx(struct blk_mq_hw_ctx *hctx) | |
744 | { | |
5cf9c91b CH |
745 | if (!hctx->queue->debugfs_dir) |
746 | return; | |
9c1051aa | 747 | debugfs_remove_recursive(hctx->debugfs_dir); |
d332ce09 | 748 | hctx->sched_debugfs_dir = NULL; |
9c1051aa | 749 | hctx->debugfs_dir = NULL; |
07e4fead OS |
750 | } |
751 | ||
6cfc0081 | 752 | void blk_mq_debugfs_register_hctxs(struct request_queue *q) |
07e4fead OS |
753 | { |
754 | struct blk_mq_hw_ctx *hctx; | |
4f481208 | 755 | unsigned long i; |
07e4fead | 756 | |
6cfc0081 GKH |
757 | queue_for_each_hw_ctx(q, hctx, i) |
758 | blk_mq_debugfs_register_hctx(q, hctx); | |
07e4fead OS |
759 | } |
760 | ||
9c1051aa | 761 | void blk_mq_debugfs_unregister_hctxs(struct request_queue *q) |
07e4fead | 762 | { |
9c1051aa | 763 | struct blk_mq_hw_ctx *hctx; |
4f481208 | 764 | unsigned long i; |
9c1051aa OS |
765 | |
766 | queue_for_each_hw_ctx(q, hctx, i) | |
767 | blk_mq_debugfs_unregister_hctx(hctx); | |
07e4fead | 768 | } |
d332ce09 | 769 | |
6cfc0081 | 770 | void blk_mq_debugfs_register_sched(struct request_queue *q) |
d332ce09 OS |
771 | { |
772 | struct elevator_type *e = q->elevator->type; | |
773 | ||
5cf9c91b CH |
774 | lockdep_assert_held(&q->debugfs_mutex); |
775 | ||
7e41c3c9 GKH |
776 | /* |
777 | * If the parent directory has not been created yet, return, we will be | |
778 | * called again later on and the directory/files will be created then. | |
779 | */ | |
780 | if (!q->debugfs_dir) | |
781 | return; | |
782 | ||
d332ce09 | 783 | if (!e->queue_debugfs_attrs) |
6cfc0081 | 784 | return; |
d332ce09 OS |
785 | |
786 | q->sched_debugfs_dir = debugfs_create_dir("sched", q->debugfs_dir); | |
d332ce09 | 787 | |
6cfc0081 | 788 | debugfs_create_files(q->sched_debugfs_dir, q, e->queue_debugfs_attrs); |
d332ce09 OS |
789 | } |
790 | ||
791 | void blk_mq_debugfs_unregister_sched(struct request_queue *q) | |
792 | { | |
5cf9c91b CH |
793 | lockdep_assert_held(&q->debugfs_mutex); |
794 | ||
d332ce09 OS |
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 | { | |
5cf9c91b CH |
816 | lockdep_assert_held(&rqos->q->debugfs_mutex); |
817 | ||
818 | if (!rqos->q->debugfs_dir) | |
819 | return; | |
cc56694f ML |
820 | debugfs_remove_recursive(rqos->debugfs_dir); |
821 | rqos->debugfs_dir = NULL; | |
822 | } | |
823 | ||
6cfc0081 | 824 | void blk_mq_debugfs_register_rqos(struct rq_qos *rqos) |
cc56694f ML |
825 | { |
826 | struct request_queue *q = rqos->q; | |
827 | const char *dir_name = rq_qos_id_to_name(rqos->id); | |
828 | ||
5cf9c91b CH |
829 | lockdep_assert_held(&q->debugfs_mutex); |
830 | ||
cc56694f | 831 | if (rqos->debugfs_dir || !rqos->ops->debugfs_attrs) |
6cfc0081 | 832 | return; |
cc56694f | 833 | |
6cfc0081 | 834 | if (!q->rqos_debugfs_dir) |
cc56694f ML |
835 | q->rqos_debugfs_dir = debugfs_create_dir("rqos", |
836 | q->debugfs_dir); | |
cc56694f ML |
837 | |
838 | rqos->debugfs_dir = debugfs_create_dir(dir_name, | |
839 | rqos->q->rqos_debugfs_dir); | |
cc56694f | 840 | |
6cfc0081 | 841 | debugfs_create_files(rqos->debugfs_dir, rqos, rqos->ops->debugfs_attrs); |
cc56694f ML |
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 | ||
5cf9c91b CH |
849 | lockdep_assert_held(&q->debugfs_mutex); |
850 | ||
1e91e28e S |
851 | /* |
852 | * If the parent debugfs directory has not been created yet, return; | |
853 | * We will be called again later on with appropriate parent debugfs | |
854 | * directory from blk_register_queue() | |
855 | */ | |
856 | if (!hctx->debugfs_dir) | |
857 | return; | |
858 | ||
d332ce09 | 859 | if (!e->hctx_debugfs_attrs) |
6cfc0081 | 860 | return; |
d332ce09 OS |
861 | |
862 | hctx->sched_debugfs_dir = debugfs_create_dir("sched", | |
863 | hctx->debugfs_dir); | |
6cfc0081 GKH |
864 | debugfs_create_files(hctx->sched_debugfs_dir, hctx, |
865 | e->hctx_debugfs_attrs); | |
d332ce09 OS |
866 | } |
867 | ||
868 | void blk_mq_debugfs_unregister_sched_hctx(struct blk_mq_hw_ctx *hctx) | |
869 | { | |
5cf9c91b CH |
870 | lockdep_assert_held(&hctx->queue->debugfs_mutex); |
871 | ||
872 | if (!hctx->queue->debugfs_dir) | |
873 | return; | |
d332ce09 OS |
874 | debugfs_remove_recursive(hctx->sched_debugfs_dir); |
875 | hctx->sched_debugfs_dir = NULL; | |
876 | } |