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Commit | Line | Data |
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07e4fead OS |
1 | /* |
2 | * Copyright (C) 2017 Facebook | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public | |
6 | * License v2 as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License | |
14 | * along with this program. If not, see <https://www.gnu.org/licenses/>. | |
15 | */ | |
16 | ||
17 | #include <linux/kernel.h> | |
18 | #include <linux/blkdev.h> | |
19 | #include <linux/debugfs.h> | |
20 | ||
21 | #include <linux/blk-mq.h> | |
18fbda91 | 22 | #include "blk.h" |
07e4fead | 23 | #include "blk-mq.h" |
d173a251 | 24 | #include "blk-mq-debugfs.h" |
d96b37c0 | 25 | #include "blk-mq-tag.h" |
07e4fead | 26 | |
91d68905 BVA |
27 | static int blk_flags_show(struct seq_file *m, const unsigned long flags, |
28 | const char *const *flag_name, int flag_name_count) | |
29 | { | |
30 | bool sep = false; | |
31 | int i; | |
32 | ||
33 | for (i = 0; i < sizeof(flags) * BITS_PER_BYTE; i++) { | |
34 | if (!(flags & BIT(i))) | |
35 | continue; | |
36 | if (sep) | |
bec03d6b | 37 | seq_puts(m, "|"); |
91d68905 BVA |
38 | sep = true; |
39 | if (i < flag_name_count && flag_name[i]) | |
40 | seq_puts(m, flag_name[i]); | |
41 | else | |
42 | seq_printf(m, "%d", i); | |
43 | } | |
91d68905 BVA |
44 | return 0; |
45 | } | |
46 | ||
1a435111 | 47 | #define QUEUE_FLAG_NAME(name) [QUEUE_FLAG_##name] = #name |
91d68905 | 48 | static const char *const blk_queue_flag_name[] = { |
1a435111 OS |
49 | QUEUE_FLAG_NAME(QUEUED), |
50 | QUEUE_FLAG_NAME(STOPPED), | |
51 | QUEUE_FLAG_NAME(SYNCFULL), | |
52 | QUEUE_FLAG_NAME(ASYNCFULL), | |
53 | QUEUE_FLAG_NAME(DYING), | |
54 | QUEUE_FLAG_NAME(BYPASS), | |
55 | QUEUE_FLAG_NAME(BIDI), | |
56 | QUEUE_FLAG_NAME(NOMERGES), | |
57 | QUEUE_FLAG_NAME(SAME_COMP), | |
58 | QUEUE_FLAG_NAME(FAIL_IO), | |
59 | QUEUE_FLAG_NAME(STACKABLE), | |
60 | QUEUE_FLAG_NAME(NONROT), | |
61 | QUEUE_FLAG_NAME(IO_STAT), | |
62 | QUEUE_FLAG_NAME(DISCARD), | |
63 | QUEUE_FLAG_NAME(NOXMERGES), | |
64 | QUEUE_FLAG_NAME(ADD_RANDOM), | |
65 | QUEUE_FLAG_NAME(SECERASE), | |
66 | QUEUE_FLAG_NAME(SAME_FORCE), | |
67 | QUEUE_FLAG_NAME(DEAD), | |
68 | QUEUE_FLAG_NAME(INIT_DONE), | |
69 | QUEUE_FLAG_NAME(NO_SG_MERGE), | |
70 | QUEUE_FLAG_NAME(POLL), | |
71 | QUEUE_FLAG_NAME(WC), | |
72 | QUEUE_FLAG_NAME(FUA), | |
73 | QUEUE_FLAG_NAME(FLUSH_NQ), | |
74 | QUEUE_FLAG_NAME(DAX), | |
75 | QUEUE_FLAG_NAME(STATS), | |
76 | QUEUE_FLAG_NAME(POLL_STATS), | |
77 | QUEUE_FLAG_NAME(REGISTERED), | |
91d68905 | 78 | }; |
1a435111 | 79 | #undef QUEUE_FLAG_NAME |
91d68905 | 80 | |
f57de23a | 81 | static int queue_state_show(void *data, struct seq_file *m) |
91d68905 | 82 | { |
f57de23a | 83 | struct request_queue *q = data; |
91d68905 BVA |
84 | |
85 | blk_flags_show(m, q->queue_flags, blk_queue_flag_name, | |
86 | ARRAY_SIZE(blk_queue_flag_name)); | |
fd07dc81 | 87 | seq_puts(m, "\n"); |
91d68905 BVA |
88 | return 0; |
89 | } | |
90 | ||
f57de23a OS |
91 | static ssize_t queue_state_write(void *data, const char __user *buf, |
92 | size_t count, loff_t *ppos) | |
91d68905 | 93 | { |
f57de23a | 94 | struct request_queue *q = data; |
71b90511 | 95 | char opbuf[16] = { }, *op; |
91d68905 | 96 | |
18d4d7d0 BVA |
97 | /* |
98 | * The "state" attribute is removed after blk_cleanup_queue() has called | |
99 | * blk_mq_free_queue(). Return if QUEUE_FLAG_DEAD has been set to avoid | |
100 | * triggering a use-after-free. | |
101 | */ | |
102 | if (blk_queue_dead(q)) | |
103 | return -ENOENT; | |
104 | ||
71b90511 | 105 | if (count >= sizeof(opbuf)) { |
c7e4145a OS |
106 | pr_err("%s: operation too long\n", __func__); |
107 | goto inval; | |
108 | } | |
109 | ||
71b90511 | 110 | if (copy_from_user(opbuf, buf, count)) |
91d68905 | 111 | return -EFAULT; |
71b90511 | 112 | op = strstrip(opbuf); |
91d68905 BVA |
113 | if (strcmp(op, "run") == 0) { |
114 | blk_mq_run_hw_queues(q, true); | |
115 | } else if (strcmp(op, "start") == 0) { | |
116 | blk_mq_start_stopped_hw_queues(q, true); | |
117 | } else { | |
c7e4145a OS |
118 | pr_err("%s: unsupported operation '%s'\n", __func__, op); |
119 | inval: | |
120 | pr_err("%s: use either 'run' or 'start'\n", __func__); | |
91d68905 BVA |
121 | return -EINVAL; |
122 | } | |
c7e4145a | 123 | return count; |
91d68905 BVA |
124 | } |
125 | ||
34dbad5d OS |
126 | static void print_stat(struct seq_file *m, struct blk_rq_stat *stat) |
127 | { | |
128 | if (stat->nr_samples) { | |
129 | seq_printf(m, "samples=%d, mean=%lld, min=%llu, max=%llu", | |
130 | stat->nr_samples, stat->mean, stat->min, stat->max); | |
131 | } else { | |
132 | seq_puts(m, "samples=0"); | |
133 | } | |
134 | } | |
135 | ||
f57de23a | 136 | static int queue_poll_stat_show(void *data, struct seq_file *m) |
34dbad5d | 137 | { |
f57de23a | 138 | struct request_queue *q = data; |
0206319f | 139 | int bucket; |
34dbad5d | 140 | |
0206319f SB |
141 | for (bucket = 0; bucket < BLK_MQ_POLL_STATS_BKTS/2; bucket++) { |
142 | seq_printf(m, "read (%d Bytes): ", 1 << (9+bucket)); | |
143 | print_stat(m, &q->poll_stat[2*bucket]); | |
144 | seq_puts(m, "\n"); | |
34dbad5d | 145 | |
0206319f SB |
146 | seq_printf(m, "write (%d Bytes): ", 1 << (9+bucket)); |
147 | print_stat(m, &q->poll_stat[2*bucket+1]); | |
148 | seq_puts(m, "\n"); | |
149 | } | |
34dbad5d OS |
150 | return 0; |
151 | } | |
152 | ||
1a435111 | 153 | #define HCTX_STATE_NAME(name) [BLK_MQ_S_##name] = #name |
f5c0b091 | 154 | static const char *const hctx_state_name[] = { |
1a435111 OS |
155 | HCTX_STATE_NAME(STOPPED), |
156 | HCTX_STATE_NAME(TAG_ACTIVE), | |
157 | HCTX_STATE_NAME(SCHED_RESTART), | |
158 | HCTX_STATE_NAME(TAG_WAITING), | |
159 | HCTX_STATE_NAME(START_ON_RUN), | |
f5c0b091 | 160 | }; |
1a435111 OS |
161 | #undef HCTX_STATE_NAME |
162 | ||
f57de23a | 163 | static int hctx_state_show(void *data, struct seq_file *m) |
9abb2ad2 | 164 | { |
f57de23a | 165 | struct blk_mq_hw_ctx *hctx = data; |
9abb2ad2 | 166 | |
f5c0b091 BVA |
167 | blk_flags_show(m, hctx->state, hctx_state_name, |
168 | ARRAY_SIZE(hctx_state_name)); | |
fd07dc81 | 169 | seq_puts(m, "\n"); |
9abb2ad2 OS |
170 | return 0; |
171 | } | |
172 | ||
1a435111 | 173 | #define BLK_TAG_ALLOC_NAME(name) [BLK_TAG_ALLOC_##name] = #name |
f5c0b091 | 174 | static const char *const alloc_policy_name[] = { |
1a435111 OS |
175 | BLK_TAG_ALLOC_NAME(FIFO), |
176 | BLK_TAG_ALLOC_NAME(RR), | |
f5c0b091 | 177 | }; |
1a435111 | 178 | #undef BLK_TAG_ALLOC_NAME |
f5c0b091 | 179 | |
1a435111 | 180 | #define HCTX_FLAG_NAME(name) [ilog2(BLK_MQ_F_##name)] = #name |
f5c0b091 | 181 | static const char *const hctx_flag_name[] = { |
1a435111 OS |
182 | HCTX_FLAG_NAME(SHOULD_MERGE), |
183 | HCTX_FLAG_NAME(TAG_SHARED), | |
184 | HCTX_FLAG_NAME(SG_MERGE), | |
185 | HCTX_FLAG_NAME(BLOCKING), | |
186 | HCTX_FLAG_NAME(NO_SCHED), | |
f5c0b091 | 187 | }; |
1a435111 | 188 | #undef HCTX_FLAG_NAME |
f5c0b091 | 189 | |
f57de23a | 190 | static int hctx_flags_show(void *data, struct seq_file *m) |
9abb2ad2 | 191 | { |
f57de23a | 192 | struct blk_mq_hw_ctx *hctx = data; |
f5c0b091 | 193 | const int alloc_policy = BLK_MQ_FLAG_TO_ALLOC_POLICY(hctx->flags); |
9abb2ad2 | 194 | |
f5c0b091 BVA |
195 | seq_puts(m, "alloc_policy="); |
196 | if (alloc_policy < ARRAY_SIZE(alloc_policy_name) && | |
197 | alloc_policy_name[alloc_policy]) | |
198 | seq_puts(m, alloc_policy_name[alloc_policy]); | |
199 | else | |
200 | seq_printf(m, "%d", alloc_policy); | |
201 | seq_puts(m, " "); | |
202 | blk_flags_show(m, | |
203 | hctx->flags ^ BLK_ALLOC_POLICY_TO_MQ_FLAG(alloc_policy), | |
204 | hctx_flag_name, ARRAY_SIZE(hctx_flag_name)); | |
fd07dc81 | 205 | seq_puts(m, "\n"); |
9abb2ad2 OS |
206 | return 0; |
207 | } | |
208 | ||
1a435111 | 209 | #define REQ_OP_NAME(name) [REQ_OP_##name] = #name |
8658dca8 | 210 | static const char *const op_name[] = { |
1a435111 OS |
211 | REQ_OP_NAME(READ), |
212 | REQ_OP_NAME(WRITE), | |
213 | REQ_OP_NAME(FLUSH), | |
214 | REQ_OP_NAME(DISCARD), | |
215 | REQ_OP_NAME(ZONE_REPORT), | |
216 | REQ_OP_NAME(SECURE_ERASE), | |
217 | REQ_OP_NAME(ZONE_RESET), | |
218 | REQ_OP_NAME(WRITE_SAME), | |
219 | REQ_OP_NAME(WRITE_ZEROES), | |
220 | REQ_OP_NAME(SCSI_IN), | |
221 | REQ_OP_NAME(SCSI_OUT), | |
222 | REQ_OP_NAME(DRV_IN), | |
223 | REQ_OP_NAME(DRV_OUT), | |
8658dca8 | 224 | }; |
1a435111 | 225 | #undef REQ_OP_NAME |
8658dca8 | 226 | |
1a435111 | 227 | #define CMD_FLAG_NAME(name) [__REQ_##name] = #name |
8658dca8 | 228 | static const char *const cmd_flag_name[] = { |
1a435111 OS |
229 | CMD_FLAG_NAME(FAILFAST_DEV), |
230 | CMD_FLAG_NAME(FAILFAST_TRANSPORT), | |
231 | CMD_FLAG_NAME(FAILFAST_DRIVER), | |
232 | CMD_FLAG_NAME(SYNC), | |
233 | CMD_FLAG_NAME(META), | |
234 | CMD_FLAG_NAME(PRIO), | |
235 | CMD_FLAG_NAME(NOMERGE), | |
236 | CMD_FLAG_NAME(IDLE), | |
237 | CMD_FLAG_NAME(INTEGRITY), | |
238 | CMD_FLAG_NAME(FUA), | |
239 | CMD_FLAG_NAME(PREFLUSH), | |
240 | CMD_FLAG_NAME(RAHEAD), | |
241 | CMD_FLAG_NAME(BACKGROUND), | |
242 | CMD_FLAG_NAME(NOUNMAP), | |
8658dca8 | 243 | }; |
1a435111 | 244 | #undef CMD_FLAG_NAME |
8658dca8 | 245 | |
1a435111 | 246 | #define RQF_NAME(name) [ilog2((__force u32)RQF_##name)] = #name |
8658dca8 | 247 | static const char *const rqf_name[] = { |
1a435111 OS |
248 | RQF_NAME(SORTED), |
249 | RQF_NAME(STARTED), | |
250 | RQF_NAME(QUEUED), | |
251 | RQF_NAME(SOFTBARRIER), | |
252 | RQF_NAME(FLUSH_SEQ), | |
253 | RQF_NAME(MIXED_MERGE), | |
254 | RQF_NAME(MQ_INFLIGHT), | |
255 | RQF_NAME(DONTPREP), | |
256 | RQF_NAME(PREEMPT), | |
257 | RQF_NAME(COPY_USER), | |
258 | RQF_NAME(FAILED), | |
259 | RQF_NAME(QUIET), | |
260 | RQF_NAME(ELVPRIV), | |
261 | RQF_NAME(IO_STAT), | |
262 | RQF_NAME(ALLOCED), | |
263 | RQF_NAME(PM), | |
264 | RQF_NAME(HASHED), | |
265 | RQF_NAME(STATS), | |
266 | RQF_NAME(SPECIAL_PAYLOAD), | |
8658dca8 | 267 | }; |
1a435111 | 268 | #undef RQF_NAME |
8658dca8 | 269 | |
16b738f6 | 270 | int blk_mq_debugfs_rq_show(struct seq_file *m, void *v) |
950cd7e9 OS |
271 | { |
272 | struct request *rq = list_entry_rq(v); | |
2836ee4b | 273 | const struct blk_mq_ops *const mq_ops = rq->q->mq_ops; |
8658dca8 | 274 | const unsigned int op = rq->cmd_flags & REQ_OP_MASK; |
950cd7e9 | 275 | |
8658dca8 BVA |
276 | seq_printf(m, "%p {.op=", rq); |
277 | if (op < ARRAY_SIZE(op_name) && op_name[op]) | |
278 | seq_printf(m, "%s", op_name[op]); | |
279 | else | |
280 | seq_printf(m, "%d", op); | |
281 | seq_puts(m, ", .cmd_flags="); | |
282 | blk_flags_show(m, rq->cmd_flags & ~REQ_OP_MASK, cmd_flag_name, | |
283 | ARRAY_SIZE(cmd_flag_name)); | |
284 | seq_puts(m, ", .rq_flags="); | |
285 | blk_flags_show(m, (__force unsigned int)rq->rq_flags, rqf_name, | |
286 | ARRAY_SIZE(rqf_name)); | |
2836ee4b | 287 | seq_printf(m, ", .tag=%d, .internal_tag=%d", rq->tag, |
8658dca8 | 288 | rq->internal_tag); |
2836ee4b BVA |
289 | if (mq_ops->show_rq) |
290 | mq_ops->show_rq(m, rq); | |
291 | seq_puts(m, "}\n"); | |
950cd7e9 OS |
292 | return 0; |
293 | } | |
16b738f6 | 294 | EXPORT_SYMBOL_GPL(blk_mq_debugfs_rq_show); |
950cd7e9 OS |
295 | |
296 | static void *hctx_dispatch_start(struct seq_file *m, loff_t *pos) | |
f3bcb0e6 | 297 | __acquires(&hctx->lock) |
950cd7e9 OS |
298 | { |
299 | struct blk_mq_hw_ctx *hctx = m->private; | |
300 | ||
301 | spin_lock(&hctx->lock); | |
302 | return seq_list_start(&hctx->dispatch, *pos); | |
303 | } | |
304 | ||
305 | static void *hctx_dispatch_next(struct seq_file *m, void *v, loff_t *pos) | |
306 | { | |
307 | struct blk_mq_hw_ctx *hctx = m->private; | |
308 | ||
309 | return seq_list_next(v, &hctx->dispatch, pos); | |
310 | } | |
311 | ||
312 | static void hctx_dispatch_stop(struct seq_file *m, void *v) | |
f3bcb0e6 | 313 | __releases(&hctx->lock) |
950cd7e9 OS |
314 | { |
315 | struct blk_mq_hw_ctx *hctx = m->private; | |
316 | ||
317 | spin_unlock(&hctx->lock); | |
318 | } | |
319 | ||
320 | static const struct seq_operations hctx_dispatch_seq_ops = { | |
321 | .start = hctx_dispatch_start, | |
322 | .next = hctx_dispatch_next, | |
323 | .stop = hctx_dispatch_stop, | |
324 | .show = blk_mq_debugfs_rq_show, | |
325 | }; | |
326 | ||
f57de23a | 327 | static int hctx_ctx_map_show(void *data, struct seq_file *m) |
0bfa5288 | 328 | { |
f57de23a | 329 | struct blk_mq_hw_ctx *hctx = data; |
0bfa5288 OS |
330 | |
331 | sbitmap_bitmap_show(&hctx->ctx_map, m); | |
332 | return 0; | |
333 | } | |
334 | ||
d96b37c0 OS |
335 | static void blk_mq_debugfs_tags_show(struct seq_file *m, |
336 | struct blk_mq_tags *tags) | |
337 | { | |
338 | seq_printf(m, "nr_tags=%u\n", tags->nr_tags); | |
339 | seq_printf(m, "nr_reserved_tags=%u\n", tags->nr_reserved_tags); | |
340 | seq_printf(m, "active_queues=%d\n", | |
341 | atomic_read(&tags->active_queues)); | |
342 | ||
343 | seq_puts(m, "\nbitmap_tags:\n"); | |
344 | sbitmap_queue_show(&tags->bitmap_tags, m); | |
345 | ||
346 | if (tags->nr_reserved_tags) { | |
347 | seq_puts(m, "\nbreserved_tags:\n"); | |
348 | sbitmap_queue_show(&tags->breserved_tags, m); | |
349 | } | |
350 | } | |
351 | ||
f57de23a | 352 | static int hctx_tags_show(void *data, struct seq_file *m) |
d96b37c0 | 353 | { |
f57de23a | 354 | struct blk_mq_hw_ctx *hctx = data; |
d96b37c0 | 355 | struct request_queue *q = hctx->queue; |
8c0f14ea | 356 | int res; |
d96b37c0 | 357 | |
8c0f14ea BVA |
358 | res = mutex_lock_interruptible(&q->sysfs_lock); |
359 | if (res) | |
360 | goto out; | |
d96b37c0 OS |
361 | if (hctx->tags) |
362 | blk_mq_debugfs_tags_show(m, hctx->tags); | |
363 | mutex_unlock(&q->sysfs_lock); | |
364 | ||
8c0f14ea BVA |
365 | out: |
366 | return res; | |
d96b37c0 OS |
367 | } |
368 | ||
f57de23a | 369 | static int hctx_tags_bitmap_show(void *data, struct seq_file *m) |
d7e3621a | 370 | { |
f57de23a | 371 | struct blk_mq_hw_ctx *hctx = data; |
d7e3621a | 372 | struct request_queue *q = hctx->queue; |
8c0f14ea | 373 | int res; |
d7e3621a | 374 | |
8c0f14ea BVA |
375 | res = mutex_lock_interruptible(&q->sysfs_lock); |
376 | if (res) | |
377 | goto out; | |
d7e3621a OS |
378 | if (hctx->tags) |
379 | sbitmap_bitmap_show(&hctx->tags->bitmap_tags.sb, m); | |
380 | mutex_unlock(&q->sysfs_lock); | |
8c0f14ea BVA |
381 | |
382 | out: | |
383 | return res; | |
d7e3621a OS |
384 | } |
385 | ||
f57de23a | 386 | static int hctx_sched_tags_show(void *data, struct seq_file *m) |
d96b37c0 | 387 | { |
f57de23a | 388 | struct blk_mq_hw_ctx *hctx = data; |
d96b37c0 | 389 | struct request_queue *q = hctx->queue; |
8c0f14ea | 390 | int res; |
d96b37c0 | 391 | |
8c0f14ea BVA |
392 | res = mutex_lock_interruptible(&q->sysfs_lock); |
393 | if (res) | |
394 | goto out; | |
d96b37c0 OS |
395 | if (hctx->sched_tags) |
396 | blk_mq_debugfs_tags_show(m, hctx->sched_tags); | |
397 | mutex_unlock(&q->sysfs_lock); | |
398 | ||
8c0f14ea BVA |
399 | out: |
400 | return res; | |
d96b37c0 OS |
401 | } |
402 | ||
f57de23a | 403 | static int hctx_sched_tags_bitmap_show(void *data, struct seq_file *m) |
d7e3621a | 404 | { |
f57de23a | 405 | struct blk_mq_hw_ctx *hctx = data; |
d7e3621a | 406 | struct request_queue *q = hctx->queue; |
8c0f14ea | 407 | int res; |
d7e3621a | 408 | |
8c0f14ea BVA |
409 | res = mutex_lock_interruptible(&q->sysfs_lock); |
410 | if (res) | |
411 | goto out; | |
d7e3621a OS |
412 | if (hctx->sched_tags) |
413 | sbitmap_bitmap_show(&hctx->sched_tags->bitmap_tags.sb, m); | |
414 | mutex_unlock(&q->sysfs_lock); | |
8c0f14ea BVA |
415 | |
416 | out: | |
417 | return res; | |
d7e3621a OS |
418 | } |
419 | ||
f57de23a | 420 | static int hctx_io_poll_show(void *data, struct seq_file *m) |
be215473 | 421 | { |
f57de23a | 422 | struct blk_mq_hw_ctx *hctx = data; |
be215473 OS |
423 | |
424 | seq_printf(m, "considered=%lu\n", hctx->poll_considered); | |
425 | seq_printf(m, "invoked=%lu\n", hctx->poll_invoked); | |
426 | seq_printf(m, "success=%lu\n", hctx->poll_success); | |
427 | return 0; | |
428 | } | |
429 | ||
f57de23a | 430 | static ssize_t hctx_io_poll_write(void *data, const char __user *buf, |
be215473 OS |
431 | size_t count, loff_t *ppos) |
432 | { | |
f57de23a | 433 | struct blk_mq_hw_ctx *hctx = data; |
be215473 OS |
434 | |
435 | hctx->poll_considered = hctx->poll_invoked = hctx->poll_success = 0; | |
436 | return count; | |
437 | } | |
438 | ||
f57de23a | 439 | static int hctx_dispatched_show(void *data, struct seq_file *m) |
be215473 | 440 | { |
f57de23a | 441 | struct blk_mq_hw_ctx *hctx = data; |
be215473 OS |
442 | int i; |
443 | ||
444 | seq_printf(m, "%8u\t%lu\n", 0U, hctx->dispatched[0]); | |
445 | ||
446 | for (i = 1; i < BLK_MQ_MAX_DISPATCH_ORDER - 1; i++) { | |
447 | unsigned int d = 1U << (i - 1); | |
448 | ||
449 | seq_printf(m, "%8u\t%lu\n", d, hctx->dispatched[i]); | |
450 | } | |
451 | ||
452 | seq_printf(m, "%8u+\t%lu\n", 1U << (i - 1), hctx->dispatched[i]); | |
453 | return 0; | |
454 | } | |
455 | ||
f57de23a | 456 | static ssize_t hctx_dispatched_write(void *data, const char __user *buf, |
be215473 OS |
457 | size_t count, loff_t *ppos) |
458 | { | |
f57de23a | 459 | struct blk_mq_hw_ctx *hctx = data; |
be215473 OS |
460 | int i; |
461 | ||
462 | for (i = 0; i < BLK_MQ_MAX_DISPATCH_ORDER; i++) | |
463 | hctx->dispatched[i] = 0; | |
464 | return count; | |
465 | } | |
466 | ||
f57de23a | 467 | static int hctx_queued_show(void *data, struct seq_file *m) |
4a46f05e | 468 | { |
f57de23a | 469 | struct blk_mq_hw_ctx *hctx = data; |
4a46f05e OS |
470 | |
471 | seq_printf(m, "%lu\n", hctx->queued); | |
472 | return 0; | |
473 | } | |
474 | ||
f57de23a | 475 | static ssize_t hctx_queued_write(void *data, const char __user *buf, |
4a46f05e OS |
476 | size_t count, loff_t *ppos) |
477 | { | |
f57de23a | 478 | struct blk_mq_hw_ctx *hctx = data; |
4a46f05e OS |
479 | |
480 | hctx->queued = 0; | |
481 | return count; | |
482 | } | |
483 | ||
f57de23a | 484 | static int hctx_run_show(void *data, struct seq_file *m) |
4a46f05e | 485 | { |
f57de23a | 486 | struct blk_mq_hw_ctx *hctx = data; |
4a46f05e OS |
487 | |
488 | seq_printf(m, "%lu\n", hctx->run); | |
489 | return 0; | |
490 | } | |
491 | ||
f57de23a OS |
492 | static ssize_t hctx_run_write(void *data, const char __user *buf, size_t count, |
493 | loff_t *ppos) | |
4a46f05e | 494 | { |
f57de23a | 495 | struct blk_mq_hw_ctx *hctx = data; |
4a46f05e OS |
496 | |
497 | hctx->run = 0; | |
498 | return count; | |
499 | } | |
500 | ||
f57de23a | 501 | static int hctx_active_show(void *data, struct seq_file *m) |
4a46f05e | 502 | { |
f57de23a | 503 | struct blk_mq_hw_ctx *hctx = data; |
4a46f05e OS |
504 | |
505 | seq_printf(m, "%d\n", atomic_read(&hctx->nr_active)); | |
506 | return 0; | |
507 | } | |
508 | ||
950cd7e9 | 509 | static void *ctx_rq_list_start(struct seq_file *m, loff_t *pos) |
f3bcb0e6 | 510 | __acquires(&ctx->lock) |
950cd7e9 OS |
511 | { |
512 | struct blk_mq_ctx *ctx = m->private; | |
513 | ||
514 | spin_lock(&ctx->lock); | |
515 | return seq_list_start(&ctx->rq_list, *pos); | |
516 | } | |
517 | ||
518 | static void *ctx_rq_list_next(struct seq_file *m, void *v, loff_t *pos) | |
519 | { | |
520 | struct blk_mq_ctx *ctx = m->private; | |
521 | ||
522 | return seq_list_next(v, &ctx->rq_list, pos); | |
523 | } | |
524 | ||
525 | static void ctx_rq_list_stop(struct seq_file *m, void *v) | |
f3bcb0e6 | 526 | __releases(&ctx->lock) |
950cd7e9 OS |
527 | { |
528 | struct blk_mq_ctx *ctx = m->private; | |
529 | ||
530 | spin_unlock(&ctx->lock); | |
531 | } | |
532 | ||
533 | static const struct seq_operations ctx_rq_list_seq_ops = { | |
534 | .start = ctx_rq_list_start, | |
535 | .next = ctx_rq_list_next, | |
536 | .stop = ctx_rq_list_stop, | |
537 | .show = blk_mq_debugfs_rq_show, | |
538 | }; | |
f57de23a | 539 | static int ctx_dispatched_show(void *data, struct seq_file *m) |
4a46f05e | 540 | { |
f57de23a | 541 | struct blk_mq_ctx *ctx = data; |
4a46f05e OS |
542 | |
543 | seq_printf(m, "%lu %lu\n", ctx->rq_dispatched[1], ctx->rq_dispatched[0]); | |
544 | return 0; | |
545 | } | |
546 | ||
f57de23a | 547 | static ssize_t ctx_dispatched_write(void *data, const char __user *buf, |
4a46f05e OS |
548 | size_t count, loff_t *ppos) |
549 | { | |
f57de23a | 550 | struct blk_mq_ctx *ctx = data; |
4a46f05e OS |
551 | |
552 | ctx->rq_dispatched[0] = ctx->rq_dispatched[1] = 0; | |
553 | return count; | |
554 | } | |
555 | ||
f57de23a | 556 | static int ctx_merged_show(void *data, struct seq_file *m) |
4a46f05e | 557 | { |
f57de23a | 558 | struct blk_mq_ctx *ctx = data; |
4a46f05e OS |
559 | |
560 | seq_printf(m, "%lu\n", ctx->rq_merged); | |
561 | return 0; | |
562 | } | |
563 | ||
f57de23a OS |
564 | static ssize_t ctx_merged_write(void *data, const char __user *buf, |
565 | size_t count, loff_t *ppos) | |
4a46f05e | 566 | { |
f57de23a | 567 | struct blk_mq_ctx *ctx = data; |
4a46f05e OS |
568 | |
569 | ctx->rq_merged = 0; | |
570 | return count; | |
571 | } | |
572 | ||
f57de23a | 573 | static int ctx_completed_show(void *data, struct seq_file *m) |
4a46f05e | 574 | { |
f57de23a | 575 | struct blk_mq_ctx *ctx = data; |
4a46f05e OS |
576 | |
577 | seq_printf(m, "%lu %lu\n", ctx->rq_completed[1], ctx->rq_completed[0]); | |
578 | return 0; | |
579 | } | |
580 | ||
f57de23a OS |
581 | static ssize_t ctx_completed_write(void *data, const char __user *buf, |
582 | size_t count, loff_t *ppos) | |
4a46f05e | 583 | { |
f57de23a OS |
584 | struct blk_mq_ctx *ctx = data; |
585 | ||
586 | ctx->rq_completed[0] = ctx->rq_completed[1] = 0; | |
587 | return count; | |
4a46f05e OS |
588 | } |
589 | ||
f57de23a OS |
590 | static int blk_mq_debugfs_show(struct seq_file *m, void *v) |
591 | { | |
592 | const struct blk_mq_debugfs_attr *attr = m->private; | |
593 | void *data = d_inode(m->file->f_path.dentry->d_parent)->i_private; | |
594 | ||
595 | return attr->show(data, m); | |
596 | } | |
597 | ||
598 | static ssize_t blk_mq_debugfs_write(struct file *file, const char __user *buf, | |
599 | size_t count, loff_t *ppos) | |
4a46f05e OS |
600 | { |
601 | struct seq_file *m = file->private_data; | |
f57de23a OS |
602 | const struct blk_mq_debugfs_attr *attr = m->private; |
603 | void *data = d_inode(file->f_path.dentry->d_parent)->i_private; | |
4a46f05e | 604 | |
f57de23a OS |
605 | if (!attr->write) |
606 | return -EPERM; | |
607 | ||
608 | return attr->write(data, buf, count, ppos); | |
609 | } | |
610 | ||
611 | static int blk_mq_debugfs_open(struct inode *inode, struct file *file) | |
612 | { | |
613 | const struct blk_mq_debugfs_attr *attr = inode->i_private; | |
614 | void *data = d_inode(file->f_path.dentry->d_parent)->i_private; | |
615 | struct seq_file *m; | |
616 | int ret; | |
617 | ||
618 | if (attr->seq_ops) { | |
619 | ret = seq_open(file, attr->seq_ops); | |
620 | if (!ret) { | |
621 | m = file->private_data; | |
622 | m->private = data; | |
623 | } | |
624 | return ret; | |
625 | } | |
626 | ||
627 | if (WARN_ON_ONCE(!attr->show)) | |
628 | return -EPERM; | |
629 | ||
630 | return single_open(file, blk_mq_debugfs_show, inode->i_private); | |
4a46f05e OS |
631 | } |
632 | ||
f57de23a OS |
633 | static int blk_mq_debugfs_release(struct inode *inode, struct file *file) |
634 | { | |
635 | const struct blk_mq_debugfs_attr *attr = inode->i_private; | |
636 | ||
637 | if (attr->show) | |
638 | return single_release(inode, file); | |
639 | else | |
640 | return seq_release(inode, file); | |
641 | } | |
642 | ||
643 | const struct file_operations blk_mq_debugfs_fops = { | |
644 | .open = blk_mq_debugfs_open, | |
4a46f05e | 645 | .read = seq_read, |
f57de23a | 646 | .write = blk_mq_debugfs_write, |
4a46f05e | 647 | .llseek = seq_lseek, |
f57de23a | 648 | .release = blk_mq_debugfs_release, |
4a46f05e OS |
649 | }; |
650 | ||
34dbad5d | 651 | static const struct blk_mq_debugfs_attr blk_mq_debugfs_queue_attrs[] = { |
f57de23a OS |
652 | {"poll_stat", 0400, queue_poll_stat_show}, |
653 | {"state", 0600, queue_state_show, queue_state_write}, | |
34dbad5d OS |
654 | {}, |
655 | }; | |
656 | ||
07e4fead | 657 | static const struct blk_mq_debugfs_attr blk_mq_debugfs_hctx_attrs[] = { |
f57de23a OS |
658 | {"state", 0400, hctx_state_show}, |
659 | {"flags", 0400, hctx_flags_show}, | |
660 | {"dispatch", 0400, .seq_ops = &hctx_dispatch_seq_ops}, | |
661 | {"ctx_map", 0400, hctx_ctx_map_show}, | |
662 | {"tags", 0400, hctx_tags_show}, | |
663 | {"tags_bitmap", 0400, hctx_tags_bitmap_show}, | |
664 | {"sched_tags", 0400, hctx_sched_tags_show}, | |
665 | {"sched_tags_bitmap", 0400, hctx_sched_tags_bitmap_show}, | |
666 | {"io_poll", 0600, hctx_io_poll_show, hctx_io_poll_write}, | |
667 | {"dispatched", 0600, hctx_dispatched_show, hctx_dispatched_write}, | |
668 | {"queued", 0600, hctx_queued_show, hctx_queued_write}, | |
669 | {"run", 0600, hctx_run_show, hctx_run_write}, | |
670 | {"active", 0400, hctx_active_show}, | |
72f2f8f6 | 671 | {}, |
07e4fead OS |
672 | }; |
673 | ||
674 | static const struct blk_mq_debugfs_attr blk_mq_debugfs_ctx_attrs[] = { | |
f57de23a OS |
675 | {"rq_list", 0400, .seq_ops = &ctx_rq_list_seq_ops}, |
676 | {"dispatched", 0600, ctx_dispatched_show, ctx_dispatched_write}, | |
677 | {"merged", 0600, ctx_merged_show, ctx_merged_write}, | |
678 | {"completed", 0600, ctx_completed_show, ctx_completed_write}, | |
72f2f8f6 | 679 | {}, |
07e4fead OS |
680 | }; |
681 | ||
9c1051aa OS |
682 | static bool debugfs_create_files(struct dentry *parent, void *data, |
683 | const struct blk_mq_debugfs_attr *attr) | |
684 | { | |
685 | d_inode(parent)->i_private = data; | |
686 | ||
687 | for (; attr->name; attr++) { | |
688 | if (!debugfs_create_file(attr->name, attr->mode, parent, | |
689 | (void *)attr, &blk_mq_debugfs_fops)) | |
690 | return false; | |
691 | } | |
692 | return true; | |
693 | } | |
694 | ||
4c9e4019 | 695 | int blk_mq_debugfs_register(struct request_queue *q) |
07e4fead | 696 | { |
9c1051aa OS |
697 | struct blk_mq_hw_ctx *hctx; |
698 | int i; | |
699 | ||
18fbda91 | 700 | if (!blk_debugfs_root) |
07e4fead OS |
701 | return -ENOENT; |
702 | ||
4c9e4019 BVA |
703 | q->debugfs_dir = debugfs_create_dir(kobject_name(q->kobj.parent), |
704 | blk_debugfs_root); | |
07e4fead | 705 | if (!q->debugfs_dir) |
9c1051aa | 706 | return -ENOMEM; |
07e4fead | 707 | |
9c1051aa OS |
708 | if (!debugfs_create_files(q->debugfs_dir, q, |
709 | blk_mq_debugfs_queue_attrs)) | |
07e4fead OS |
710 | goto err; |
711 | ||
9c1051aa OS |
712 | /* |
713 | * blk_mq_init_hctx() attempted to do this already, but q->debugfs_dir | |
714 | * didn't exist yet (because we don't know what to name the directory | |
715 | * until the queue is registered to a gendisk). | |
716 | */ | |
717 | queue_for_each_hw_ctx(q, hctx, i) { | |
718 | if (!hctx->debugfs_dir && blk_mq_debugfs_register_hctx(q, hctx)) | |
719 | goto err; | |
d332ce09 OS |
720 | if (q->elevator && !hctx->sched_debugfs_dir && |
721 | blk_mq_debugfs_register_sched_hctx(q, hctx)) | |
722 | goto err; | |
9c1051aa OS |
723 | } |
724 | ||
07e4fead OS |
725 | return 0; |
726 | ||
727 | err: | |
728 | blk_mq_debugfs_unregister(q); | |
729 | return -ENOMEM; | |
730 | } | |
731 | ||
732 | void blk_mq_debugfs_unregister(struct request_queue *q) | |
733 | { | |
734 | debugfs_remove_recursive(q->debugfs_dir); | |
d332ce09 | 735 | q->sched_debugfs_dir = NULL; |
07e4fead OS |
736 | q->debugfs_dir = NULL; |
737 | } | |
738 | ||
9c1051aa OS |
739 | static int blk_mq_debugfs_register_ctx(struct blk_mq_hw_ctx *hctx, |
740 | struct blk_mq_ctx *ctx) | |
07e4fead OS |
741 | { |
742 | struct dentry *ctx_dir; | |
743 | char name[20]; | |
07e4fead OS |
744 | |
745 | snprintf(name, sizeof(name), "cpu%u", ctx->cpu); | |
9c1051aa | 746 | ctx_dir = debugfs_create_dir(name, hctx->debugfs_dir); |
07e4fead OS |
747 | if (!ctx_dir) |
748 | return -ENOMEM; | |
749 | ||
72f2f8f6 BVA |
750 | if (!debugfs_create_files(ctx_dir, ctx, blk_mq_debugfs_ctx_attrs)) |
751 | return -ENOMEM; | |
07e4fead OS |
752 | |
753 | return 0; | |
754 | } | |
755 | ||
9c1051aa OS |
756 | int blk_mq_debugfs_register_hctx(struct request_queue *q, |
757 | struct blk_mq_hw_ctx *hctx) | |
07e4fead OS |
758 | { |
759 | struct blk_mq_ctx *ctx; | |
07e4fead OS |
760 | char name[20]; |
761 | int i; | |
762 | ||
9c1051aa OS |
763 | if (!q->debugfs_dir) |
764 | return -ENOENT; | |
765 | ||
88aabbd7 | 766 | snprintf(name, sizeof(name), "hctx%u", hctx->queue_num); |
9c1051aa OS |
767 | hctx->debugfs_dir = debugfs_create_dir(name, q->debugfs_dir); |
768 | if (!hctx->debugfs_dir) | |
07e4fead OS |
769 | return -ENOMEM; |
770 | ||
9c1051aa OS |
771 | if (!debugfs_create_files(hctx->debugfs_dir, hctx, |
772 | blk_mq_debugfs_hctx_attrs)) | |
773 | goto err; | |
07e4fead OS |
774 | |
775 | hctx_for_each_ctx(hctx, ctx, i) { | |
9c1051aa OS |
776 | if (blk_mq_debugfs_register_ctx(hctx, ctx)) |
777 | goto err; | |
07e4fead OS |
778 | } |
779 | ||
780 | return 0; | |
9c1051aa OS |
781 | |
782 | err: | |
783 | blk_mq_debugfs_unregister_hctx(hctx); | |
784 | return -ENOMEM; | |
785 | } | |
786 | ||
787 | void blk_mq_debugfs_unregister_hctx(struct blk_mq_hw_ctx *hctx) | |
788 | { | |
789 | debugfs_remove_recursive(hctx->debugfs_dir); | |
d332ce09 | 790 | hctx->sched_debugfs_dir = NULL; |
9c1051aa | 791 | hctx->debugfs_dir = NULL; |
07e4fead OS |
792 | } |
793 | ||
9c1051aa | 794 | int blk_mq_debugfs_register_hctxs(struct request_queue *q) |
07e4fead OS |
795 | { |
796 | struct blk_mq_hw_ctx *hctx; | |
797 | int i; | |
798 | ||
07e4fead OS |
799 | queue_for_each_hw_ctx(q, hctx, i) { |
800 | if (blk_mq_debugfs_register_hctx(q, hctx)) | |
9c1051aa | 801 | return -ENOMEM; |
07e4fead OS |
802 | } |
803 | ||
804 | return 0; | |
07e4fead OS |
805 | } |
806 | ||
9c1051aa | 807 | void blk_mq_debugfs_unregister_hctxs(struct request_queue *q) |
07e4fead | 808 | { |
9c1051aa OS |
809 | struct blk_mq_hw_ctx *hctx; |
810 | int i; | |
811 | ||
812 | queue_for_each_hw_ctx(q, hctx, i) | |
813 | blk_mq_debugfs_unregister_hctx(hctx); | |
07e4fead | 814 | } |
d332ce09 OS |
815 | |
816 | int blk_mq_debugfs_register_sched(struct request_queue *q) | |
817 | { | |
818 | struct elevator_type *e = q->elevator->type; | |
819 | ||
820 | if (!q->debugfs_dir) | |
821 | return -ENOENT; | |
822 | ||
823 | if (!e->queue_debugfs_attrs) | |
824 | return 0; | |
825 | ||
826 | q->sched_debugfs_dir = debugfs_create_dir("sched", q->debugfs_dir); | |
827 | if (!q->sched_debugfs_dir) | |
828 | return -ENOMEM; | |
829 | ||
830 | if (!debugfs_create_files(q->sched_debugfs_dir, q, | |
831 | e->queue_debugfs_attrs)) | |
832 | goto err; | |
833 | ||
834 | return 0; | |
835 | ||
836 | err: | |
837 | blk_mq_debugfs_unregister_sched(q); | |
838 | return -ENOMEM; | |
839 | } | |
840 | ||
841 | void blk_mq_debugfs_unregister_sched(struct request_queue *q) | |
842 | { | |
843 | debugfs_remove_recursive(q->sched_debugfs_dir); | |
844 | q->sched_debugfs_dir = NULL; | |
845 | } | |
846 | ||
847 | int blk_mq_debugfs_register_sched_hctx(struct request_queue *q, | |
848 | struct blk_mq_hw_ctx *hctx) | |
849 | { | |
850 | struct elevator_type *e = q->elevator->type; | |
851 | ||
852 | if (!hctx->debugfs_dir) | |
853 | return -ENOENT; | |
854 | ||
855 | if (!e->hctx_debugfs_attrs) | |
856 | return 0; | |
857 | ||
858 | hctx->sched_debugfs_dir = debugfs_create_dir("sched", | |
859 | hctx->debugfs_dir); | |
860 | if (!hctx->sched_debugfs_dir) | |
861 | return -ENOMEM; | |
862 | ||
863 | if (!debugfs_create_files(hctx->sched_debugfs_dir, hctx, | |
864 | e->hctx_debugfs_attrs)) | |
865 | return -ENOMEM; | |
866 | ||
867 | return 0; | |
868 | } | |
869 | ||
870 | void blk_mq_debugfs_unregister_sched_hctx(struct blk_mq_hw_ctx *hctx) | |
871 | { | |
872 | debugfs_remove_recursive(hctx->sched_debugfs_dir); | |
873 | hctx->sched_debugfs_dir = NULL; | |
874 | } |