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 | { |
f0d33ab7 | 73 | if (blk_mq_queue_stopped(q)) |
4cc96131 | 74 | return; |
2397a15a | 75 | |
7b17c2f7 | 76 | blk_mq_quiesce_queue(q); |
4cc96131 MS |
77 | } |
78 | ||
4cc96131 MS |
79 | /* |
80 | * Partial completion handling for request-based dm | |
81 | */ | |
82 | static void end_clone_bio(struct bio *clone) | |
83 | { | |
84 | struct dm_rq_clone_bio_info *info = | |
85 | container_of(clone, struct dm_rq_clone_bio_info, clone); | |
86 | struct dm_rq_target_io *tio = info->tio; | |
4cc96131 | 87 | unsigned int nr_bytes = info->orig->bi_iter.bi_size; |
4e4cbee9 | 88 | blk_status_t error = clone->bi_status; |
dc6364b5 | 89 | bool is_last = !clone->bi_next; |
4cc96131 MS |
90 | |
91 | bio_put(clone); | |
92 | ||
93 | if (tio->error) | |
94 | /* | |
95 | * An error has already been detected on the request. | |
96 | * Once error occurred, just let clone->end_io() handle | |
97 | * the remainder. | |
98 | */ | |
99 | return; | |
100 | else if (error) { | |
101 | /* | |
102 | * Don't notice the error to the upper layer yet. | |
103 | * The error handling decision is made by the target driver, | |
104 | * when the request is completed. | |
105 | */ | |
106 | tio->error = error; | |
dc6364b5 | 107 | goto exit; |
4cc96131 MS |
108 | } |
109 | ||
110 | /* | |
111 | * I/O for the bio successfully completed. | |
112 | * Notice the data completion to the upper layer. | |
113 | */ | |
dc6364b5 | 114 | tio->completed += nr_bytes; |
4cc96131 MS |
115 | |
116 | /* | |
117 | * Update the original request. | |
118 | * Do not use blk_end_request() here, because it may complete | |
119 | * the original request before the clone, and break the ordering. | |
120 | */ | |
dc6364b5 ML |
121 | if (is_last) |
122 | exit: | |
123 | blk_update_request(tio->orig, BLK_STS_OK, tio->completed); | |
4cc96131 MS |
124 | } |
125 | ||
126 | static struct dm_rq_target_io *tio_from_request(struct request *rq) | |
127 | { | |
eb8db831 | 128 | return blk_mq_rq_to_pdu(rq); |
4cc96131 MS |
129 | } |
130 | ||
131 | static void rq_end_stats(struct mapped_device *md, struct request *orig) | |
132 | { | |
133 | if (unlikely(dm_stats_used(&md->stats))) { | |
134 | struct dm_rq_target_io *tio = tio_from_request(orig); | |
135 | tio->duration_jiffies = jiffies - tio->duration_jiffies; | |
136 | dm_stats_account_io(&md->stats, rq_data_dir(orig), | |
137 | blk_rq_pos(orig), tio->n_sectors, true, | |
138 | tio->duration_jiffies, &tio->stats_aux); | |
139 | } | |
140 | } | |
141 | ||
142 | /* | |
143 | * Don't touch any member of the md after calling this function because | |
144 | * the md may be freed in dm_put() at the end of this function. | |
145 | * Or do dm_get() before calling this function and dm_put() later. | |
146 | */ | |
2adc5c55 | 147 | static void rq_completed(struct mapped_device *md) |
4cc96131 | 148 | { |
4cc96131 | 149 | /* nudge anyone waiting on suspend queue */ |
645efa84 | 150 | if (unlikely(wq_has_sleeper(&md->wait))) |
c4576aed | 151 | wake_up(&md->wait); |
4cc96131 | 152 | |
4cc96131 MS |
153 | /* |
154 | * dm_put() must be at the end of this function. See the comment above | |
155 | */ | |
156 | dm_put(md); | |
157 | } | |
158 | ||
4cc96131 MS |
159 | /* |
160 | * Complete the clone and the original request. | |
161 | * Must be called without clone's queue lock held, | |
162 | * see end_clone_request() for more details. | |
163 | */ | |
2a842aca | 164 | static void dm_end_request(struct request *clone, blk_status_t error) |
4cc96131 | 165 | { |
4cc96131 MS |
166 | struct dm_rq_target_io *tio = clone->end_io_data; |
167 | struct mapped_device *md = tio->md; | |
168 | struct request *rq = tio->orig; | |
169 | ||
eb8db831 CH |
170 | blk_rq_unprep_clone(clone); |
171 | tio->ti->type->release_clone_rq(clone); | |
4cc96131 | 172 | |
4cc96131 | 173 | rq_end_stats(md, rq); |
6a23e05c | 174 | blk_mq_end_request(rq, error); |
2adc5c55 | 175 | rq_completed(md); |
4cc96131 MS |
176 | } |
177 | ||
e0c10752 | 178 | static void __dm_mq_kick_requeue_list(struct request_queue *q, unsigned long msecs) |
4cc96131 | 179 | { |
52d7f1b5 | 180 | blk_mq_delay_kick_requeue_list(q, msecs); |
4cc96131 MS |
181 | } |
182 | ||
e0c10752 MS |
183 | void dm_mq_kick_requeue_list(struct mapped_device *md) |
184 | { | |
185 | __dm_mq_kick_requeue_list(dm_get_md_queue(md), 0); | |
186 | } | |
187 | EXPORT_SYMBOL(dm_mq_kick_requeue_list); | |
188 | ||
189 | static void dm_mq_delay_requeue_request(struct request *rq, unsigned long msecs) | |
190 | { | |
2b053aca | 191 | blk_mq_requeue_request(rq, false); |
e0c10752 MS |
192 | __dm_mq_kick_requeue_list(rq->q, msecs); |
193 | } | |
194 | ||
fbc39b4c | 195 | static void dm_requeue_original_request(struct dm_rq_target_io *tio, bool delay_requeue) |
4cc96131 | 196 | { |
fbc39b4c MS |
197 | struct mapped_device *md = tio->md; |
198 | struct request *rq = tio->orig; | |
d5c27f3f | 199 | unsigned long delay_ms = delay_requeue ? 100 : 0; |
4cc96131 MS |
200 | |
201 | rq_end_stats(md, rq); | |
eb8db831 CH |
202 | if (tio->clone) { |
203 | blk_rq_unprep_clone(tio->clone); | |
204 | tio->ti->type->release_clone_rq(tio->clone); | |
205 | } | |
4cc96131 | 206 | |
6a23e05c | 207 | dm_mq_delay_requeue_request(rq, delay_ms); |
2adc5c55 | 208 | rq_completed(md); |
4cc96131 MS |
209 | } |
210 | ||
2a842aca | 211 | static void dm_done(struct request *clone, blk_status_t error, bool mapped) |
4cc96131 | 212 | { |
7ed8578a | 213 | int r = DM_ENDIO_DONE; |
4cc96131 MS |
214 | struct dm_rq_target_io *tio = clone->end_io_data; |
215 | dm_request_endio_fn rq_end_io = NULL; | |
216 | ||
217 | if (tio->ti) { | |
218 | rq_end_io = tio->ti->type->rq_end_io; | |
219 | ||
220 | if (mapped && rq_end_io) | |
221 | r = rq_end_io(tio->ti, clone, error, &tio->info); | |
222 | } | |
223 | ||
2a842aca | 224 | if (unlikely(error == BLK_STS_TARGET)) { |
ac62d620 CH |
225 | if (req_op(clone) == REQ_OP_WRITE_SAME && |
226 | !clone->q->limits.max_write_same_sectors) | |
227 | disable_write_same(tio->md); | |
228 | if (req_op(clone) == REQ_OP_WRITE_ZEROES && | |
229 | !clone->q->limits.max_write_zeroes_sectors) | |
230 | disable_write_zeroes(tio->md); | |
231 | } | |
4cc96131 | 232 | |
7ed8578a CH |
233 | switch (r) { |
234 | case DM_ENDIO_DONE: | |
4cc96131 | 235 | /* The target wants to complete the I/O */ |
7ed8578a CH |
236 | dm_end_request(clone, error); |
237 | break; | |
238 | case DM_ENDIO_INCOMPLETE: | |
4cc96131 MS |
239 | /* The target will handle the I/O */ |
240 | return; | |
7ed8578a | 241 | case DM_ENDIO_REQUEUE: |
4cc96131 | 242 | /* The target wants to requeue the I/O */ |
fbc39b4c | 243 | dm_requeue_original_request(tio, false); |
7ed8578a | 244 | break; |
ac514ffc MS |
245 | case DM_ENDIO_DELAY_REQUEUE: |
246 | /* The target wants to requeue the I/O after a delay */ | |
247 | dm_requeue_original_request(tio, true); | |
248 | break; | |
7ed8578a | 249 | default: |
4cc96131 MS |
250 | DMWARN("unimplemented target endio return value: %d", r); |
251 | BUG(); | |
252 | } | |
253 | } | |
254 | ||
255 | /* | |
256 | * Request completion handler for request-based dm | |
257 | */ | |
258 | static void dm_softirq_done(struct request *rq) | |
259 | { | |
260 | bool mapped = true; | |
261 | struct dm_rq_target_io *tio = tio_from_request(rq); | |
262 | struct request *clone = tio->clone; | |
4cc96131 MS |
263 | |
264 | if (!clone) { | |
61febef4 JA |
265 | struct mapped_device *md = tio->md; |
266 | ||
267 | rq_end_stats(md, rq); | |
6a23e05c | 268 | blk_mq_end_request(rq, tio->error); |
2adc5c55 | 269 | rq_completed(md); |
4cc96131 MS |
270 | return; |
271 | } | |
272 | ||
e8064021 | 273 | if (rq->rq_flags & RQF_FAILED) |
4cc96131 MS |
274 | mapped = false; |
275 | ||
276 | dm_done(clone, tio->error, mapped); | |
277 | } | |
278 | ||
279 | /* | |
280 | * Complete the clone and the original request with the error status | |
281 | * through softirq context. | |
282 | */ | |
2a842aca | 283 | static void dm_complete_request(struct request *rq, blk_status_t error) |
4cc96131 MS |
284 | { |
285 | struct dm_rq_target_io *tio = tio_from_request(rq); | |
286 | ||
287 | tio->error = error; | |
6a23e05c | 288 | blk_mq_complete_request(rq); |
4cc96131 MS |
289 | } |
290 | ||
291 | /* | |
292 | * Complete the not-mapped clone and the original request with the error status | |
293 | * through softirq context. | |
294 | * Target's rq_end_io() function isn't called. | |
6a23e05c | 295 | * This may be used when the target's clone_and_map_rq() function fails. |
4cc96131 | 296 | */ |
2a842aca | 297 | static void dm_kill_unmapped_request(struct request *rq, blk_status_t error) |
4cc96131 | 298 | { |
e8064021 | 299 | rq->rq_flags |= RQF_FAILED; |
4cc96131 MS |
300 | dm_complete_request(rq, error); |
301 | } | |
302 | ||
2a842aca | 303 | static void end_clone_request(struct request *clone, blk_status_t error) |
4cc96131 MS |
304 | { |
305 | struct dm_rq_target_io *tio = clone->end_io_data; | |
306 | ||
4cc96131 MS |
307 | dm_complete_request(tio->orig, error); |
308 | } | |
309 | ||
396eaf21 | 310 | static blk_status_t dm_dispatch_clone_request(struct request *clone, struct request *rq) |
4cc96131 | 311 | { |
2a842aca | 312 | blk_status_t r; |
4cc96131 MS |
313 | |
314 | if (blk_queue_io_stat(clone->q)) | |
e8064021 | 315 | clone->rq_flags |= RQF_IO_STAT; |
4cc96131 | 316 | |
522a7775 | 317 | clone->start_time_ns = ktime_get_ns(); |
4cc96131 | 318 | r = blk_insert_cloned_request(clone->q, clone); |
86ff7c2a | 319 | if (r != BLK_STS_OK && r != BLK_STS_RESOURCE && r != BLK_STS_DEV_RESOURCE) |
4cc96131 MS |
320 | /* must complete clone in terms of original request */ |
321 | dm_complete_request(rq, r); | |
396eaf21 | 322 | return r; |
4cc96131 MS |
323 | } |
324 | ||
325 | static int dm_rq_bio_constructor(struct bio *bio, struct bio *bio_orig, | |
326 | void *data) | |
327 | { | |
328 | struct dm_rq_target_io *tio = data; | |
329 | struct dm_rq_clone_bio_info *info = | |
330 | container_of(bio, struct dm_rq_clone_bio_info, clone); | |
331 | ||
332 | info->orig = bio_orig; | |
333 | info->tio = tio; | |
334 | bio->bi_end_io = end_clone_bio; | |
335 | ||
336 | return 0; | |
337 | } | |
338 | ||
339 | static int setup_clone(struct request *clone, struct request *rq, | |
340 | struct dm_rq_target_io *tio, gfp_t gfp_mask) | |
341 | { | |
342 | int r; | |
343 | ||
6f1c819c | 344 | r = blk_rq_prep_clone(clone, rq, &tio->md->bs, gfp_mask, |
4cc96131 MS |
345 | dm_rq_bio_constructor, tio); |
346 | if (r) | |
347 | return r; | |
348 | ||
4cc96131 MS |
349 | clone->end_io = end_clone_request; |
350 | clone->end_io_data = tio; | |
351 | ||
352 | tio->clone = clone; | |
353 | ||
354 | return 0; | |
355 | } | |
356 | ||
4cc96131 MS |
357 | static void init_tio(struct dm_rq_target_io *tio, struct request *rq, |
358 | struct mapped_device *md) | |
359 | { | |
360 | tio->md = md; | |
361 | tio->ti = NULL; | |
362 | tio->clone = NULL; | |
363 | tio->orig = rq; | |
364 | tio->error = 0; | |
dc6364b5 | 365 | tio->completed = 0; |
4cc96131 MS |
366 | /* |
367 | * Avoid initializing info for blk-mq; it passes | |
368 | * target-specific data through info.ptr | |
369 | * (see: dm_mq_init_request) | |
370 | */ | |
371 | if (!md->init_tio_pdu) | |
372 | memset(&tio->info, 0, sizeof(tio->info)); | |
4cc96131 MS |
373 | } |
374 | ||
4cc96131 MS |
375 | /* |
376 | * Returns: | |
a8ac51e4 MS |
377 | * DM_MAPIO_* : the request has been processed as indicated |
378 | * DM_MAPIO_REQUEUE : the original request needs to be immediately requeued | |
4cc96131 MS |
379 | * < 0 : the request was completed due to failure |
380 | */ | |
fbc39b4c | 381 | static int map_request(struct dm_rq_target_io *tio) |
4cc96131 MS |
382 | { |
383 | int r; | |
384 | struct dm_target *ti = tio->ti; | |
fbc39b4c MS |
385 | struct mapped_device *md = tio->md; |
386 | struct request *rq = tio->orig; | |
4cc96131 | 387 | struct request *clone = NULL; |
396eaf21 | 388 | blk_status_t ret; |
4cc96131 | 389 | |
eb8db831 | 390 | r = ti->type->clone_and_map_rq(ti, rq, &tio->info, &clone); |
4cc96131 MS |
391 | switch (r) { |
392 | case DM_MAPIO_SUBMITTED: | |
393 | /* The target has taken the I/O to submit by itself later */ | |
394 | break; | |
395 | case DM_MAPIO_REMAPPED: | |
eb8db831 CH |
396 | if (setup_clone(clone, rq, tio, GFP_ATOMIC)) { |
397 | /* -ENOMEM */ | |
398 | ti->type->release_clone_rq(clone); | |
399 | return DM_MAPIO_REQUEUE; | |
400 | } | |
401 | ||
4cc96131 MS |
402 | /* The target has remapped the I/O so dispatch it */ |
403 | trace_block_rq_remap(clone->q, clone, disk_devt(dm_disk(md)), | |
404 | blk_rq_pos(rq)); | |
396eaf21 | 405 | ret = dm_dispatch_clone_request(clone, rq); |
86ff7c2a | 406 | if (ret == BLK_STS_RESOURCE || ret == BLK_STS_DEV_RESOURCE) { |
396eaf21 ML |
407 | blk_rq_unprep_clone(clone); |
408 | tio->ti->type->release_clone_rq(clone); | |
409 | tio->clone = NULL; | |
34743bfd | 410 | return DM_MAPIO_REQUEUE; |
396eaf21 | 411 | } |
4cc96131 MS |
412 | break; |
413 | case DM_MAPIO_REQUEUE: | |
414 | /* The target wants to requeue the I/O */ | |
a8ac51e4 MS |
415 | break; |
416 | case DM_MAPIO_DELAY_REQUEUE: | |
417 | /* The target wants to requeue the I/O after a delay */ | |
fbc39b4c | 418 | dm_requeue_original_request(tio, true); |
4cc96131 | 419 | break; |
412445ac | 420 | case DM_MAPIO_KILL: |
4cc96131 | 421 | /* The target wants to complete the I/O */ |
2a842aca | 422 | dm_kill_unmapped_request(rq, BLK_STS_IOERR); |
ece07280 | 423 | break; |
412445ac CH |
424 | default: |
425 | DMWARN("unimplemented target map return value: %d", r); | |
426 | BUG(); | |
4cc96131 MS |
427 | } |
428 | ||
a8ac51e4 | 429 | return r; |
4cc96131 MS |
430 | } |
431 | ||
6a23e05c JA |
432 | /* DEPRECATED: previously used for request-based merge heuristic in dm_request_fn() */ |
433 | ssize_t dm_attr_rq_based_seq_io_merge_deadline_show(struct mapped_device *md, char *buf) | |
434 | { | |
435 | return sprintf(buf, "%u\n", 0); | |
436 | } | |
437 | ||
438 | ssize_t dm_attr_rq_based_seq_io_merge_deadline_store(struct mapped_device *md, | |
439 | const char *buf, size_t count) | |
440 | { | |
441 | return count; | |
442 | } | |
443 | ||
4cc96131 MS |
444 | static void dm_start_request(struct mapped_device *md, struct request *orig) |
445 | { | |
6a23e05c | 446 | blk_mq_start_request(orig); |
4cc96131 | 447 | |
4cc96131 MS |
448 | if (unlikely(dm_stats_used(&md->stats))) { |
449 | struct dm_rq_target_io *tio = tio_from_request(orig); | |
450 | tio->duration_jiffies = jiffies; | |
451 | tio->n_sectors = blk_rq_sectors(orig); | |
452 | dm_stats_account_io(&md->stats, rq_data_dir(orig), | |
453 | blk_rq_pos(orig), tio->n_sectors, false, 0, | |
454 | &tio->stats_aux); | |
455 | } | |
456 | ||
457 | /* | |
458 | * Hold the md reference here for the in-flight I/O. | |
459 | * We can't rely on the reference count by device opener, | |
460 | * because the device may be closed during the request completion | |
461 | * when all bios are completed. | |
462 | * See the comment in rq_completed() too. | |
463 | */ | |
464 | dm_get(md); | |
465 | } | |
466 | ||
6a23e05c JA |
467 | static int dm_mq_init_request(struct blk_mq_tag_set *set, struct request *rq, |
468 | unsigned int hctx_idx, unsigned int numa_node) | |
eb8db831 | 469 | { |
6a23e05c | 470 | struct mapped_device *md = set->driver_data; |
eb8db831 CH |
471 | struct dm_rq_target_io *tio = blk_mq_rq_to_pdu(rq); |
472 | ||
473 | /* | |
474 | * Must initialize md member of tio, otherwise it won't | |
475 | * be available in dm_mq_queue_rq. | |
476 | */ | |
477 | tio->md = md; | |
478 | ||
479 | if (md->init_tio_pdu) { | |
480 | /* target-specific per-io data is immediately after the tio */ | |
481 | tio->info.ptr = tio + 1; | |
482 | } | |
483 | ||
484 | return 0; | |
485 | } | |
486 | ||
fc17b653 | 487 | static blk_status_t dm_mq_queue_rq(struct blk_mq_hw_ctx *hctx, |
4cc96131 MS |
488 | const struct blk_mq_queue_data *bd) |
489 | { | |
490 | struct request *rq = bd->rq; | |
491 | struct dm_rq_target_io *tio = blk_mq_rq_to_pdu(rq); | |
492 | struct mapped_device *md = tio->md; | |
493 | struct dm_target *ti = md->immutable_target; | |
494 | ||
495 | if (unlikely(!ti)) { | |
496 | int srcu_idx; | |
497 | struct dm_table *map = dm_get_live_table(md, &srcu_idx); | |
498 | ||
499 | ti = dm_table_find_target(map, 0); | |
500 | dm_put_live_table(md, srcu_idx); | |
501 | } | |
502 | ||
503 | if (ti->type->busy && ti->type->busy(ti)) | |
fc17b653 | 504 | return BLK_STS_RESOURCE; |
4cc96131 MS |
505 | |
506 | dm_start_request(md, rq); | |
507 | ||
508 | /* Init tio using md established in .init_request */ | |
509 | init_tio(tio, rq, md); | |
510 | ||
511 | /* | |
512 | * Establish tio->ti before calling map_request(). | |
513 | */ | |
514 | tio->ti = ti; | |
515 | ||
516 | /* Direct call is fine since .queue_rq allows allocations */ | |
fbc39b4c | 517 | if (map_request(tio) == DM_MAPIO_REQUEUE) { |
4cc96131 MS |
518 | /* Undo dm_start_request() before requeuing */ |
519 | rq_end_stats(md, rq); | |
2adc5c55 | 520 | rq_completed(md); |
fc17b653 | 521 | return BLK_STS_RESOURCE; |
4cc96131 MS |
522 | } |
523 | ||
fc17b653 | 524 | return BLK_STS_OK; |
4cc96131 MS |
525 | } |
526 | ||
f363b089 | 527 | static const struct blk_mq_ops dm_mq_ops = { |
4cc96131 | 528 | .queue_rq = dm_mq_queue_rq, |
4cc96131 MS |
529 | .complete = dm_softirq_done, |
530 | .init_request = dm_mq_init_request, | |
531 | }; | |
532 | ||
e83068a5 | 533 | int dm_mq_init_request_queue(struct mapped_device *md, struct dm_table *t) |
4cc96131 MS |
534 | { |
535 | struct request_queue *q; | |
e83068a5 | 536 | struct dm_target *immutable_tgt; |
4cc96131 MS |
537 | int err; |
538 | ||
4cc96131 MS |
539 | md->tag_set = kzalloc_node(sizeof(struct blk_mq_tag_set), GFP_KERNEL, md->numa_node_id); |
540 | if (!md->tag_set) | |
541 | return -ENOMEM; | |
542 | ||
543 | md->tag_set->ops = &dm_mq_ops; | |
544 | md->tag_set->queue_depth = dm_get_blk_mq_queue_depth(); | |
545 | md->tag_set->numa_node = md->numa_node_id; | |
56d18f62 | 546 | md->tag_set->flags = BLK_MQ_F_SHOULD_MERGE; |
4cc96131 MS |
547 | md->tag_set->nr_hw_queues = dm_get_blk_mq_nr_hw_queues(); |
548 | md->tag_set->driver_data = md; | |
549 | ||
550 | md->tag_set->cmd_size = sizeof(struct dm_rq_target_io); | |
e83068a5 | 551 | immutable_tgt = dm_table_get_immutable_target(t); |
4cc96131 MS |
552 | if (immutable_tgt && immutable_tgt->per_io_data_size) { |
553 | /* any target-specific per-io data is immediately after the tio */ | |
554 | md->tag_set->cmd_size += immutable_tgt->per_io_data_size; | |
555 | md->init_tio_pdu = true; | |
556 | } | |
557 | ||
558 | err = blk_mq_alloc_tag_set(md->tag_set); | |
559 | if (err) | |
560 | goto out_kfree_tag_set; | |
561 | ||
562 | q = blk_mq_init_allocated_queue(md->tag_set, md->queue); | |
563 | if (IS_ERR(q)) { | |
564 | err = PTR_ERR(q); | |
565 | goto out_tag_set; | |
566 | } | |
4cc96131 | 567 | |
4cc96131 MS |
568 | return 0; |
569 | ||
570 | out_tag_set: | |
571 | blk_mq_free_tag_set(md->tag_set); | |
572 | out_kfree_tag_set: | |
573 | kfree(md->tag_set); | |
574 | ||
575 | return err; | |
576 | } | |
577 | ||
578 | void dm_mq_cleanup_mapped_device(struct mapped_device *md) | |
579 | { | |
580 | if (md->tag_set) { | |
581 | blk_mq_free_tag_set(md->tag_set); | |
582 | kfree(md->tag_set); | |
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"); |