Commit | Line | Data |
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4cc96131 MS |
1 | /* |
2 | * Copyright (C) 2016 Red Hat, Inc. All rights reserved. | |
3 | * | |
4 | * This file is released under the GPL. | |
5 | */ | |
6 | ||
7 | #include "dm-core.h" | |
8 | #include "dm-rq.h" | |
9 | ||
10 | #include <linux/elevator.h> /* for rq_end_sector() */ | |
11 | #include <linux/blk-mq.h> | |
12 | ||
13 | #define DM_MSG_PREFIX "core-rq" | |
14 | ||
e689fbab MS |
15 | /* |
16 | * One of these is allocated per request. | |
17 | */ | |
18 | struct dm_rq_target_io { | |
19 | struct mapped_device *md; | |
20 | struct dm_target *ti; | |
21 | struct request *orig, *clone; | |
22 | struct kthread_work work; | |
23 | blk_status_t error; | |
24 | union map_info info; | |
25 | struct dm_stats_aux stats_aux; | |
26 | unsigned long duration_jiffies; | |
27 | unsigned n_sectors; | |
28 | unsigned completed; | |
29 | }; | |
30 | ||
4cc96131 MS |
31 | #define DM_MQ_NR_HW_QUEUES 1 |
32 | #define DM_MQ_QUEUE_DEPTH 2048 | |
33 | static unsigned dm_mq_nr_hw_queues = DM_MQ_NR_HW_QUEUES; | |
34 | static unsigned dm_mq_queue_depth = DM_MQ_QUEUE_DEPTH; | |
35 | ||
36 | /* | |
37 | * Request-based DM's mempools' reserved IOs set by the user. | |
38 | */ | |
39 | #define RESERVED_REQUEST_BASED_IOS 256 | |
40 | static unsigned reserved_rq_based_ios = RESERVED_REQUEST_BASED_IOS; | |
41 | ||
4cc96131 MS |
42 | unsigned dm_get_reserved_rq_based_ios(void) |
43 | { | |
44 | return __dm_get_module_param(&reserved_rq_based_ios, | |
45 | RESERVED_REQUEST_BASED_IOS, DM_RESERVED_MAX_IOS); | |
46 | } | |
47 | EXPORT_SYMBOL_GPL(dm_get_reserved_rq_based_ios); | |
48 | ||
49 | static unsigned dm_get_blk_mq_nr_hw_queues(void) | |
50 | { | |
51 | return __dm_get_module_param(&dm_mq_nr_hw_queues, 1, 32); | |
52 | } | |
53 | ||
54 | static unsigned dm_get_blk_mq_queue_depth(void) | |
55 | { | |
56 | return __dm_get_module_param(&dm_mq_queue_depth, | |
57 | DM_MQ_QUEUE_DEPTH, BLK_MQ_MAX_DEPTH); | |
58 | } | |
59 | ||
60 | int dm_request_based(struct mapped_device *md) | |
61 | { | |
344e9ffc | 62 | return queue_is_mq(md->queue); |
4cc96131 MS |
63 | } |
64 | ||
6a23e05c | 65 | void dm_start_queue(struct request_queue *q) |
9dbeaeab | 66 | { |
f660174e | 67 | blk_mq_unquiesce_queue(q); |
9dbeaeab MS |
68 | blk_mq_kick_requeue_list(q); |
69 | } | |
70 | ||
6a23e05c | 71 | void dm_stop_queue(struct request_queue *q) |
2397a15a | 72 | { |
7b17c2f7 | 73 | blk_mq_quiesce_queue(q); |
4cc96131 MS |
74 | } |
75 | ||
4cc96131 MS |
76 | /* |
77 | * Partial completion handling for request-based dm | |
78 | */ | |
79 | static void end_clone_bio(struct bio *clone) | |
80 | { | |
81 | struct dm_rq_clone_bio_info *info = | |
82 | container_of(clone, struct dm_rq_clone_bio_info, clone); | |
83 | struct dm_rq_target_io *tio = info->tio; | |
4cc96131 | 84 | unsigned int nr_bytes = info->orig->bi_iter.bi_size; |
4e4cbee9 | 85 | blk_status_t error = clone->bi_status; |
dc6364b5 | 86 | bool is_last = !clone->bi_next; |
4cc96131 MS |
87 | |
88 | bio_put(clone); | |
89 | ||
90 | if (tio->error) | |
91 | /* | |
92 | * An error has already been detected on the request. | |
93 | * Once error occurred, just let clone->end_io() handle | |
94 | * the remainder. | |
95 | */ | |
96 | return; | |
97 | else if (error) { | |
98 | /* | |
99 | * Don't notice the error to the upper layer yet. | |
100 | * The error handling decision is made by the target driver, | |
101 | * when the request is completed. | |
102 | */ | |
103 | tio->error = error; | |
dc6364b5 | 104 | goto exit; |
4cc96131 MS |
105 | } |
106 | ||
107 | /* | |
108 | * I/O for the bio successfully completed. | |
109 | * Notice the data completion to the upper layer. | |
110 | */ | |
dc6364b5 | 111 | tio->completed += nr_bytes; |
4cc96131 MS |
112 | |
113 | /* | |
114 | * Update the original request. | |
d370ad23 | 115 | * Do not use blk_mq_end_request() here, because it may complete |
4cc96131 MS |
116 | * the original request before the clone, and break the ordering. |
117 | */ | |
dc6364b5 ML |
118 | if (is_last) |
119 | exit: | |
120 | blk_update_request(tio->orig, BLK_STS_OK, tio->completed); | |
4cc96131 MS |
121 | } |
122 | ||
123 | static struct dm_rq_target_io *tio_from_request(struct request *rq) | |
124 | { | |
eb8db831 | 125 | return blk_mq_rq_to_pdu(rq); |
4cc96131 MS |
126 | } |
127 | ||
128 | static void rq_end_stats(struct mapped_device *md, struct request *orig) | |
129 | { | |
130 | if (unlikely(dm_stats_used(&md->stats))) { | |
131 | struct dm_rq_target_io *tio = tio_from_request(orig); | |
132 | tio->duration_jiffies = jiffies - tio->duration_jiffies; | |
133 | dm_stats_account_io(&md->stats, rq_data_dir(orig), | |
134 | blk_rq_pos(orig), tio->n_sectors, true, | |
135 | tio->duration_jiffies, &tio->stats_aux); | |
136 | } | |
137 | } | |
138 | ||
139 | /* | |
140 | * Don't touch any member of the md after calling this function because | |
141 | * the md may be freed in dm_put() at the end of this function. | |
142 | * Or do dm_get() before calling this function and dm_put() later. | |
143 | */ | |
2adc5c55 | 144 | static void rq_completed(struct mapped_device *md) |
4cc96131 | 145 | { |
4cc96131 MS |
146 | /* |
147 | * dm_put() must be at the end of this function. See the comment above | |
148 | */ | |
149 | dm_put(md); | |
150 | } | |
151 | ||
4cc96131 MS |
152 | /* |
153 | * Complete the clone and the original request. | |
154 | * Must be called without clone's queue lock held, | |
155 | * see end_clone_request() for more details. | |
156 | */ | |
2a842aca | 157 | static void dm_end_request(struct request *clone, blk_status_t error) |
4cc96131 | 158 | { |
4cc96131 MS |
159 | struct dm_rq_target_io *tio = clone->end_io_data; |
160 | struct mapped_device *md = tio->md; | |
161 | struct request *rq = tio->orig; | |
162 | ||
eb8db831 | 163 | blk_rq_unprep_clone(clone); |
5de719e3 | 164 | tio->ti->type->release_clone_rq(clone, NULL); |
4cc96131 | 165 | |
4cc96131 | 166 | rq_end_stats(md, rq); |
6a23e05c | 167 | blk_mq_end_request(rq, error); |
2adc5c55 | 168 | rq_completed(md); |
4cc96131 MS |
169 | } |
170 | ||
e0c10752 | 171 | static void __dm_mq_kick_requeue_list(struct request_queue *q, unsigned long msecs) |
4cc96131 | 172 | { |
52d7f1b5 | 173 | blk_mq_delay_kick_requeue_list(q, msecs); |
4cc96131 MS |
174 | } |
175 | ||
e0c10752 MS |
176 | void dm_mq_kick_requeue_list(struct mapped_device *md) |
177 | { | |
33bd6f06 | 178 | __dm_mq_kick_requeue_list(md->queue, 0); |
e0c10752 MS |
179 | } |
180 | EXPORT_SYMBOL(dm_mq_kick_requeue_list); | |
181 | ||
182 | static void dm_mq_delay_requeue_request(struct request *rq, unsigned long msecs) | |
183 | { | |
2b053aca | 184 | blk_mq_requeue_request(rq, false); |
e0c10752 MS |
185 | __dm_mq_kick_requeue_list(rq->q, msecs); |
186 | } | |
187 | ||
fbc39b4c | 188 | static void dm_requeue_original_request(struct dm_rq_target_io *tio, bool delay_requeue) |
4cc96131 | 189 | { |
fbc39b4c MS |
190 | struct mapped_device *md = tio->md; |
191 | struct request *rq = tio->orig; | |
d5c27f3f | 192 | unsigned long delay_ms = delay_requeue ? 100 : 0; |
4cc96131 MS |
193 | |
194 | rq_end_stats(md, rq); | |
eb8db831 CH |
195 | if (tio->clone) { |
196 | blk_rq_unprep_clone(tio->clone); | |
5de719e3 | 197 | tio->ti->type->release_clone_rq(tio->clone, NULL); |
eb8db831 | 198 | } |
4cc96131 | 199 | |
6a23e05c | 200 | dm_mq_delay_requeue_request(rq, delay_ms); |
2adc5c55 | 201 | rq_completed(md); |
4cc96131 MS |
202 | } |
203 | ||
2a842aca | 204 | static void dm_done(struct request *clone, blk_status_t error, bool mapped) |
4cc96131 | 205 | { |
7ed8578a | 206 | int r = DM_ENDIO_DONE; |
4cc96131 MS |
207 | struct dm_rq_target_io *tio = clone->end_io_data; |
208 | dm_request_endio_fn rq_end_io = NULL; | |
209 | ||
210 | if (tio->ti) { | |
211 | rq_end_io = tio->ti->type->rq_end_io; | |
212 | ||
213 | if (mapped && rq_end_io) | |
214 | r = rq_end_io(tio->ti, clone, error, &tio->info); | |
215 | } | |
216 | ||
2a842aca | 217 | if (unlikely(error == BLK_STS_TARGET)) { |
bcb44433 MS |
218 | if (req_op(clone) == REQ_OP_DISCARD && |
219 | !clone->q->limits.max_discard_sectors) | |
220 | disable_discard(tio->md); | |
221 | else if (req_op(clone) == REQ_OP_WRITE_SAME && | |
222 | !clone->q->limits.max_write_same_sectors) | |
ac62d620 | 223 | disable_write_same(tio->md); |
bcb44433 MS |
224 | else if (req_op(clone) == REQ_OP_WRITE_ZEROES && |
225 | !clone->q->limits.max_write_zeroes_sectors) | |
ac62d620 CH |
226 | disable_write_zeroes(tio->md); |
227 | } | |
4cc96131 | 228 | |
7ed8578a CH |
229 | switch (r) { |
230 | case DM_ENDIO_DONE: | |
4cc96131 | 231 | /* The target wants to complete the I/O */ |
7ed8578a CH |
232 | dm_end_request(clone, error); |
233 | break; | |
234 | case DM_ENDIO_INCOMPLETE: | |
4cc96131 MS |
235 | /* The target will handle the I/O */ |
236 | return; | |
7ed8578a | 237 | case DM_ENDIO_REQUEUE: |
4cc96131 | 238 | /* The target wants to requeue the I/O */ |
fbc39b4c | 239 | dm_requeue_original_request(tio, false); |
7ed8578a | 240 | break; |
ac514ffc MS |
241 | case DM_ENDIO_DELAY_REQUEUE: |
242 | /* The target wants to requeue the I/O after a delay */ | |
243 | dm_requeue_original_request(tio, true); | |
244 | break; | |
7ed8578a | 245 | default: |
4cc96131 MS |
246 | DMWARN("unimplemented target endio return value: %d", r); |
247 | BUG(); | |
248 | } | |
249 | } | |
250 | ||
251 | /* | |
252 | * Request completion handler for request-based dm | |
253 | */ | |
254 | static void dm_softirq_done(struct request *rq) | |
255 | { | |
256 | bool mapped = true; | |
257 | struct dm_rq_target_io *tio = tio_from_request(rq); | |
258 | struct request *clone = tio->clone; | |
4cc96131 MS |
259 | |
260 | if (!clone) { | |
61febef4 JA |
261 | struct mapped_device *md = tio->md; |
262 | ||
263 | rq_end_stats(md, rq); | |
6a23e05c | 264 | blk_mq_end_request(rq, tio->error); |
2adc5c55 | 265 | rq_completed(md); |
4cc96131 MS |
266 | return; |
267 | } | |
268 | ||
e8064021 | 269 | if (rq->rq_flags & RQF_FAILED) |
4cc96131 MS |
270 | mapped = false; |
271 | ||
272 | dm_done(clone, tio->error, mapped); | |
273 | } | |
274 | ||
275 | /* | |
276 | * Complete the clone and the original request with the error status | |
277 | * through softirq context. | |
278 | */ | |
2a842aca | 279 | static void dm_complete_request(struct request *rq, blk_status_t error) |
4cc96131 MS |
280 | { |
281 | struct dm_rq_target_io *tio = tio_from_request(rq); | |
282 | ||
283 | tio->error = error; | |
15f73f5b CH |
284 | if (likely(!blk_should_fake_timeout(rq->q))) |
285 | blk_mq_complete_request(rq); | |
4cc96131 MS |
286 | } |
287 | ||
288 | /* | |
289 | * Complete the not-mapped clone and the original request with the error status | |
290 | * through softirq context. | |
291 | * Target's rq_end_io() function isn't called. | |
6a23e05c | 292 | * This may be used when the target's clone_and_map_rq() function fails. |
4cc96131 | 293 | */ |
2a842aca | 294 | static void dm_kill_unmapped_request(struct request *rq, blk_status_t error) |
4cc96131 | 295 | { |
e8064021 | 296 | rq->rq_flags |= RQF_FAILED; |
4cc96131 MS |
297 | dm_complete_request(rq, error); |
298 | } | |
299 | ||
2a842aca | 300 | static void end_clone_request(struct request *clone, blk_status_t error) |
4cc96131 MS |
301 | { |
302 | struct dm_rq_target_io *tio = clone->end_io_data; | |
303 | ||
4cc96131 MS |
304 | dm_complete_request(tio->orig, error); |
305 | } | |
306 | ||
396eaf21 | 307 | static blk_status_t dm_dispatch_clone_request(struct request *clone, struct request *rq) |
4cc96131 | 308 | { |
2a842aca | 309 | blk_status_t r; |
4cc96131 MS |
310 | |
311 | if (blk_queue_io_stat(clone->q)) | |
e8064021 | 312 | clone->rq_flags |= RQF_IO_STAT; |
4cc96131 | 313 | |
522a7775 | 314 | clone->start_time_ns = ktime_get_ns(); |
4cc96131 | 315 | r = blk_insert_cloned_request(clone->q, clone); |
86ff7c2a | 316 | if (r != BLK_STS_OK && r != BLK_STS_RESOURCE && r != BLK_STS_DEV_RESOURCE) |
4cc96131 MS |
317 | /* must complete clone in terms of original request */ |
318 | dm_complete_request(rq, r); | |
396eaf21 | 319 | return r; |
4cc96131 MS |
320 | } |
321 | ||
322 | static int dm_rq_bio_constructor(struct bio *bio, struct bio *bio_orig, | |
323 | void *data) | |
324 | { | |
325 | struct dm_rq_target_io *tio = data; | |
326 | struct dm_rq_clone_bio_info *info = | |
327 | container_of(bio, struct dm_rq_clone_bio_info, clone); | |
328 | ||
329 | info->orig = bio_orig; | |
330 | info->tio = tio; | |
331 | bio->bi_end_io = end_clone_bio; | |
332 | ||
333 | return 0; | |
334 | } | |
335 | ||
336 | static int setup_clone(struct request *clone, struct request *rq, | |
337 | struct dm_rq_target_io *tio, gfp_t gfp_mask) | |
338 | { | |
339 | int r; | |
340 | ||
6f1c819c | 341 | r = blk_rq_prep_clone(clone, rq, &tio->md->bs, gfp_mask, |
4cc96131 MS |
342 | dm_rq_bio_constructor, tio); |
343 | if (r) | |
344 | return r; | |
345 | ||
4cc96131 MS |
346 | clone->end_io = end_clone_request; |
347 | clone->end_io_data = tio; | |
348 | ||
349 | tio->clone = clone; | |
350 | ||
351 | return 0; | |
352 | } | |
353 | ||
4cc96131 MS |
354 | static void init_tio(struct dm_rq_target_io *tio, struct request *rq, |
355 | struct mapped_device *md) | |
356 | { | |
357 | tio->md = md; | |
358 | tio->ti = NULL; | |
359 | tio->clone = NULL; | |
360 | tio->orig = rq; | |
361 | tio->error = 0; | |
dc6364b5 | 362 | tio->completed = 0; |
4cc96131 MS |
363 | /* |
364 | * Avoid initializing info for blk-mq; it passes | |
365 | * target-specific data through info.ptr | |
366 | * (see: dm_mq_init_request) | |
367 | */ | |
368 | if (!md->init_tio_pdu) | |
369 | memset(&tio->info, 0, sizeof(tio->info)); | |
4cc96131 MS |
370 | } |
371 | ||
4cc96131 MS |
372 | /* |
373 | * Returns: | |
a8ac51e4 MS |
374 | * DM_MAPIO_* : the request has been processed as indicated |
375 | * DM_MAPIO_REQUEUE : the original request needs to be immediately requeued | |
4cc96131 MS |
376 | * < 0 : the request was completed due to failure |
377 | */ | |
fbc39b4c | 378 | static int map_request(struct dm_rq_target_io *tio) |
4cc96131 MS |
379 | { |
380 | int r; | |
381 | struct dm_target *ti = tio->ti; | |
fbc39b4c MS |
382 | struct mapped_device *md = tio->md; |
383 | struct request *rq = tio->orig; | |
4cc96131 | 384 | struct request *clone = NULL; |
396eaf21 | 385 | blk_status_t ret; |
4cc96131 | 386 | |
eb8db831 | 387 | r = ti->type->clone_and_map_rq(ti, rq, &tio->info, &clone); |
4cc96131 MS |
388 | switch (r) { |
389 | case DM_MAPIO_SUBMITTED: | |
390 | /* The target has taken the I/O to submit by itself later */ | |
391 | break; | |
392 | case DM_MAPIO_REMAPPED: | |
eb8db831 CH |
393 | if (setup_clone(clone, rq, tio, GFP_ATOMIC)) { |
394 | /* -ENOMEM */ | |
5de719e3 | 395 | ti->type->release_clone_rq(clone, &tio->info); |
eb8db831 CH |
396 | return DM_MAPIO_REQUEUE; |
397 | } | |
398 | ||
4cc96131 | 399 | /* The target has remapped the I/O so dispatch it */ |
a54895fa | 400 | trace_block_rq_remap(clone, disk_devt(dm_disk(md)), |
4cc96131 | 401 | blk_rq_pos(rq)); |
396eaf21 | 402 | ret = dm_dispatch_clone_request(clone, rq); |
86ff7c2a | 403 | if (ret == BLK_STS_RESOURCE || ret == BLK_STS_DEV_RESOURCE) { |
396eaf21 | 404 | blk_rq_unprep_clone(clone); |
226b4fc7 | 405 | blk_mq_cleanup_rq(clone); |
5de719e3 | 406 | tio->ti->type->release_clone_rq(clone, &tio->info); |
396eaf21 | 407 | tio->clone = NULL; |
34743bfd | 408 | return DM_MAPIO_REQUEUE; |
396eaf21 | 409 | } |
4cc96131 MS |
410 | break; |
411 | case DM_MAPIO_REQUEUE: | |
412 | /* The target wants to requeue the I/O */ | |
a8ac51e4 MS |
413 | break; |
414 | case DM_MAPIO_DELAY_REQUEUE: | |
415 | /* The target wants to requeue the I/O after a delay */ | |
fbc39b4c | 416 | dm_requeue_original_request(tio, true); |
4cc96131 | 417 | break; |
412445ac | 418 | case DM_MAPIO_KILL: |
4cc96131 | 419 | /* The target wants to complete the I/O */ |
2a842aca | 420 | dm_kill_unmapped_request(rq, BLK_STS_IOERR); |
ece07280 | 421 | break; |
412445ac CH |
422 | default: |
423 | DMWARN("unimplemented target map return value: %d", r); | |
424 | BUG(); | |
4cc96131 MS |
425 | } |
426 | ||
a8ac51e4 | 427 | return r; |
4cc96131 MS |
428 | } |
429 | ||
6a23e05c JA |
430 | /* DEPRECATED: previously used for request-based merge heuristic in dm_request_fn() */ |
431 | ssize_t dm_attr_rq_based_seq_io_merge_deadline_show(struct mapped_device *md, char *buf) | |
432 | { | |
433 | return sprintf(buf, "%u\n", 0); | |
434 | } | |
435 | ||
436 | ssize_t dm_attr_rq_based_seq_io_merge_deadline_store(struct mapped_device *md, | |
437 | const char *buf, size_t count) | |
438 | { | |
439 | return count; | |
440 | } | |
441 | ||
4cc96131 MS |
442 | static void dm_start_request(struct mapped_device *md, struct request *orig) |
443 | { | |
6a23e05c | 444 | blk_mq_start_request(orig); |
4cc96131 | 445 | |
4cc96131 MS |
446 | if (unlikely(dm_stats_used(&md->stats))) { |
447 | struct dm_rq_target_io *tio = tio_from_request(orig); | |
448 | tio->duration_jiffies = jiffies; | |
449 | tio->n_sectors = blk_rq_sectors(orig); | |
450 | dm_stats_account_io(&md->stats, rq_data_dir(orig), | |
451 | blk_rq_pos(orig), tio->n_sectors, false, 0, | |
452 | &tio->stats_aux); | |
453 | } | |
454 | ||
455 | /* | |
456 | * Hold the md reference here for the in-flight I/O. | |
457 | * We can't rely on the reference count by device opener, | |
458 | * because the device may be closed during the request completion | |
459 | * when all bios are completed. | |
460 | * See the comment in rq_completed() too. | |
461 | */ | |
462 | dm_get(md); | |
463 | } | |
464 | ||
6a23e05c JA |
465 | static int dm_mq_init_request(struct blk_mq_tag_set *set, struct request *rq, |
466 | unsigned int hctx_idx, unsigned int numa_node) | |
eb8db831 | 467 | { |
6a23e05c | 468 | struct mapped_device *md = set->driver_data; |
eb8db831 CH |
469 | struct dm_rq_target_io *tio = blk_mq_rq_to_pdu(rq); |
470 | ||
471 | /* | |
472 | * Must initialize md member of tio, otherwise it won't | |
473 | * be available in dm_mq_queue_rq. | |
474 | */ | |
475 | tio->md = md; | |
476 | ||
477 | if (md->init_tio_pdu) { | |
478 | /* target-specific per-io data is immediately after the tio */ | |
479 | tio->info.ptr = tio + 1; | |
480 | } | |
481 | ||
482 | return 0; | |
483 | } | |
484 | ||
fc17b653 | 485 | static blk_status_t dm_mq_queue_rq(struct blk_mq_hw_ctx *hctx, |
4cc96131 MS |
486 | const struct blk_mq_queue_data *bd) |
487 | { | |
488 | struct request *rq = bd->rq; | |
489 | struct dm_rq_target_io *tio = blk_mq_rq_to_pdu(rq); | |
490 | struct mapped_device *md = tio->md; | |
491 | struct dm_target *ti = md->immutable_target; | |
492 | ||
493 | if (unlikely(!ti)) { | |
494 | int srcu_idx; | |
495 | struct dm_table *map = dm_get_live_table(md, &srcu_idx); | |
496 | ||
497 | ti = dm_table_find_target(map, 0); | |
498 | dm_put_live_table(md, srcu_idx); | |
499 | } | |
500 | ||
501 | if (ti->type->busy && ti->type->busy(ti)) | |
fc17b653 | 502 | return BLK_STS_RESOURCE; |
4cc96131 MS |
503 | |
504 | dm_start_request(md, rq); | |
505 | ||
506 | /* Init tio using md established in .init_request */ | |
507 | init_tio(tio, rq, md); | |
508 | ||
509 | /* | |
510 | * Establish tio->ti before calling map_request(). | |
511 | */ | |
512 | tio->ti = ti; | |
513 | ||
514 | /* Direct call is fine since .queue_rq allows allocations */ | |
fbc39b4c | 515 | if (map_request(tio) == DM_MAPIO_REQUEUE) { |
4cc96131 MS |
516 | /* Undo dm_start_request() before requeuing */ |
517 | rq_end_stats(md, rq); | |
2adc5c55 | 518 | rq_completed(md); |
fc17b653 | 519 | return BLK_STS_RESOURCE; |
4cc96131 MS |
520 | } |
521 | ||
fc17b653 | 522 | return BLK_STS_OK; |
4cc96131 MS |
523 | } |
524 | ||
f363b089 | 525 | static const struct blk_mq_ops dm_mq_ops = { |
4cc96131 | 526 | .queue_rq = dm_mq_queue_rq, |
4cc96131 MS |
527 | .complete = dm_softirq_done, |
528 | .init_request = dm_mq_init_request, | |
529 | }; | |
530 | ||
e83068a5 | 531 | int dm_mq_init_request_queue(struct mapped_device *md, struct dm_table *t) |
4cc96131 MS |
532 | { |
533 | struct request_queue *q; | |
e83068a5 | 534 | struct dm_target *immutable_tgt; |
4cc96131 MS |
535 | int err; |
536 | ||
4cc96131 MS |
537 | md->tag_set = kzalloc_node(sizeof(struct blk_mq_tag_set), GFP_KERNEL, md->numa_node_id); |
538 | if (!md->tag_set) | |
539 | return -ENOMEM; | |
540 | ||
541 | md->tag_set->ops = &dm_mq_ops; | |
542 | md->tag_set->queue_depth = dm_get_blk_mq_queue_depth(); | |
543 | md->tag_set->numa_node = md->numa_node_id; | |
bf0beec0 | 544 | md->tag_set->flags = BLK_MQ_F_SHOULD_MERGE | BLK_MQ_F_STACKING; |
4cc96131 MS |
545 | md->tag_set->nr_hw_queues = dm_get_blk_mq_nr_hw_queues(); |
546 | md->tag_set->driver_data = md; | |
547 | ||
548 | md->tag_set->cmd_size = sizeof(struct dm_rq_target_io); | |
e83068a5 | 549 | immutable_tgt = dm_table_get_immutable_target(t); |
4cc96131 MS |
550 | if (immutable_tgt && immutable_tgt->per_io_data_size) { |
551 | /* any target-specific per-io data is immediately after the tio */ | |
552 | md->tag_set->cmd_size += immutable_tgt->per_io_data_size; | |
553 | md->init_tio_pdu = true; | |
554 | } | |
555 | ||
556 | err = blk_mq_alloc_tag_set(md->tag_set); | |
557 | if (err) | |
558 | goto out_kfree_tag_set; | |
559 | ||
737eb78e | 560 | q = blk_mq_init_allocated_queue(md->tag_set, md->queue, true); |
4cc96131 MS |
561 | if (IS_ERR(q)) { |
562 | err = PTR_ERR(q); | |
563 | goto out_tag_set; | |
564 | } | |
4cc96131 | 565 | |
4cc96131 MS |
566 | return 0; |
567 | ||
568 | out_tag_set: | |
569 | blk_mq_free_tag_set(md->tag_set); | |
570 | out_kfree_tag_set: | |
571 | kfree(md->tag_set); | |
8e947c8f | 572 | md->tag_set = NULL; |
4cc96131 MS |
573 | |
574 | return err; | |
575 | } | |
576 | ||
577 | void dm_mq_cleanup_mapped_device(struct mapped_device *md) | |
578 | { | |
579 | if (md->tag_set) { | |
580 | blk_mq_free_tag_set(md->tag_set); | |
581 | kfree(md->tag_set); | |
8e947c8f | 582 | md->tag_set = NULL; |
4cc96131 MS |
583 | } |
584 | } | |
585 | ||
586 | module_param(reserved_rq_based_ios, uint, S_IRUGO | S_IWUSR); | |
587 | MODULE_PARM_DESC(reserved_rq_based_ios, "Reserved IOs in request-based mempools"); | |
588 | ||
6a23e05c JA |
589 | /* Unused, but preserved for userspace compatibility */ |
590 | static bool use_blk_mq = true; | |
4cc96131 MS |
591 | module_param(use_blk_mq, bool, S_IRUGO | S_IWUSR); |
592 | MODULE_PARM_DESC(use_blk_mq, "Use block multiqueue for request-based DM devices"); | |
593 | ||
594 | module_param(dm_mq_nr_hw_queues, uint, S_IRUGO | S_IWUSR); | |
595 | MODULE_PARM_DESC(dm_mq_nr_hw_queues, "Number of hardware queues for request-based dm-mq devices"); | |
596 | ||
597 | module_param(dm_mq_queue_depth, uint, S_IRUGO | S_IWUSR); | |
598 | MODULE_PARM_DESC(dm_mq_queue_depth, "Queue depth for request-based dm-mq devices"); |