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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2003 Russell King, All Rights Reserved.
4 * Copyright 2006-2007 Pierre Ossman
5 */
6#include <linux/slab.h>
7#include <linux/module.h>
8#include <linux/blkdev.h>
9#include <linux/freezer.h>
10#include <linux/scatterlist.h>
11#include <linux/dma-mapping.h>
12#include <linux/backing-dev.h>
13
14#include <linux/mmc/card.h>
15#include <linux/mmc/host.h>
16
17#include "queue.h"
18#include "block.h"
19#include "core.h"
20#include "card.h"
21#include "crypto.h"
22#include "host.h"
23
24#define MMC_DMA_MAP_MERGE_SEGMENTS 512
25
26static inline bool mmc_cqe_dcmd_busy(struct mmc_queue *mq)
27{
28 /* Allow only 1 DCMD at a time */
29 return mq->in_flight[MMC_ISSUE_DCMD];
30}
31
32void mmc_cqe_check_busy(struct mmc_queue *mq)
33{
34 if ((mq->cqe_busy & MMC_CQE_DCMD_BUSY) && !mmc_cqe_dcmd_busy(mq))
35 mq->cqe_busy &= ~MMC_CQE_DCMD_BUSY;
36}
37
38static inline bool mmc_cqe_can_dcmd(struct mmc_host *host)
39{
40 return host->caps2 & MMC_CAP2_CQE_DCMD;
41}
42
43static enum mmc_issue_type mmc_cqe_issue_type(struct mmc_host *host,
44 struct request *req)
45{
46 switch (req_op(req)) {
47 case REQ_OP_DRV_IN:
48 case REQ_OP_DRV_OUT:
49 case REQ_OP_DISCARD:
50 case REQ_OP_SECURE_ERASE:
51 case REQ_OP_WRITE_ZEROES:
52 return MMC_ISSUE_SYNC;
53 case REQ_OP_FLUSH:
54 return mmc_cqe_can_dcmd(host) ? MMC_ISSUE_DCMD : MMC_ISSUE_SYNC;
55 default:
56 return MMC_ISSUE_ASYNC;
57 }
58}
59
60enum mmc_issue_type mmc_issue_type(struct mmc_queue *mq, struct request *req)
61{
62 struct mmc_host *host = mq->card->host;
63
64 if (host->cqe_enabled && !host->hsq_enabled)
65 return mmc_cqe_issue_type(host, req);
66
67 if (req_op(req) == REQ_OP_READ || req_op(req) == REQ_OP_WRITE)
68 return MMC_ISSUE_ASYNC;
69
70 return MMC_ISSUE_SYNC;
71}
72
73static void __mmc_cqe_recovery_notifier(struct mmc_queue *mq)
74{
75 if (!mq->recovery_needed) {
76 mq->recovery_needed = true;
77 schedule_work(&mq->recovery_work);
78 }
79}
80
81void mmc_cqe_recovery_notifier(struct mmc_request *mrq)
82{
83 struct mmc_queue_req *mqrq = container_of(mrq, struct mmc_queue_req,
84 brq.mrq);
85 struct request *req = mmc_queue_req_to_req(mqrq);
86 struct request_queue *q = req->q;
87 struct mmc_queue *mq = q->queuedata;
88 unsigned long flags;
89
90 spin_lock_irqsave(&mq->lock, flags);
91 __mmc_cqe_recovery_notifier(mq);
92 spin_unlock_irqrestore(&mq->lock, flags);
93}
94
95static enum blk_eh_timer_return mmc_cqe_timed_out(struct request *req)
96{
97 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
98 struct mmc_request *mrq = &mqrq->brq.mrq;
99 struct mmc_queue *mq = req->q->queuedata;
100 struct mmc_host *host = mq->card->host;
101 enum mmc_issue_type issue_type = mmc_issue_type(mq, req);
102 bool recovery_needed = false;
103
104 switch (issue_type) {
105 case MMC_ISSUE_ASYNC:
106 case MMC_ISSUE_DCMD:
107 if (host->cqe_ops->cqe_timeout(host, mrq, &recovery_needed)) {
108 if (recovery_needed)
109 mmc_cqe_recovery_notifier(mrq);
110 return BLK_EH_RESET_TIMER;
111 }
112 /* The request has gone already */
113 return BLK_EH_DONE;
114 default:
115 /* Timeout is handled by mmc core */
116 return BLK_EH_RESET_TIMER;
117 }
118}
119
120static enum blk_eh_timer_return mmc_mq_timed_out(struct request *req)
121{
122 struct request_queue *q = req->q;
123 struct mmc_queue *mq = q->queuedata;
124 struct mmc_card *card = mq->card;
125 struct mmc_host *host = card->host;
126 unsigned long flags;
127 bool ignore_tout;
128
129 spin_lock_irqsave(&mq->lock, flags);
130 ignore_tout = mq->recovery_needed || !host->cqe_enabled || host->hsq_enabled;
131 spin_unlock_irqrestore(&mq->lock, flags);
132
133 return ignore_tout ? BLK_EH_RESET_TIMER : mmc_cqe_timed_out(req);
134}
135
136static void mmc_mq_recovery_handler(struct work_struct *work)
137{
138 struct mmc_queue *mq = container_of(work, struct mmc_queue,
139 recovery_work);
140 struct request_queue *q = mq->queue;
141 struct mmc_host *host = mq->card->host;
142
143 mmc_get_card(mq->card, &mq->ctx);
144
145 mq->in_recovery = true;
146
147 if (host->cqe_enabled && !host->hsq_enabled)
148 mmc_blk_cqe_recovery(mq);
149 else
150 mmc_blk_mq_recovery(mq);
151
152 mq->in_recovery = false;
153
154 spin_lock_irq(&mq->lock);
155 mq->recovery_needed = false;
156 spin_unlock_irq(&mq->lock);
157
158 if (host->hsq_enabled)
159 host->cqe_ops->cqe_recovery_finish(host);
160
161 mmc_put_card(mq->card, &mq->ctx);
162
163 blk_mq_run_hw_queues(q, true);
164}
165
166static struct scatterlist *mmc_alloc_sg(unsigned short sg_len, gfp_t gfp)
167{
168 struct scatterlist *sg;
169
170 sg = kmalloc_array(sg_len, sizeof(*sg), gfp);
171 if (sg)
172 sg_init_table(sg, sg_len);
173
174 return sg;
175}
176
177static void mmc_queue_setup_discard(struct request_queue *q,
178 struct mmc_card *card)
179{
180 unsigned max_discard;
181
182 max_discard = mmc_calc_max_discard(card);
183 if (!max_discard)
184 return;
185
186 blk_queue_max_discard_sectors(q, max_discard);
187 q->limits.discard_granularity = card->pref_erase << 9;
188 /* granularity must not be greater than max. discard */
189 if (card->pref_erase > max_discard)
190 q->limits.discard_granularity = SECTOR_SIZE;
191 if (mmc_can_secure_erase_trim(card))
192 blk_queue_max_secure_erase_sectors(q, max_discard);
193 if (mmc_can_trim(card) && card->erased_byte == 0)
194 blk_queue_max_write_zeroes_sectors(q, max_discard);
195}
196
197static unsigned short mmc_get_max_segments(struct mmc_host *host)
198{
199 return host->can_dma_map_merge ? MMC_DMA_MAP_MERGE_SEGMENTS :
200 host->max_segs;
201}
202
203static int mmc_mq_init_request(struct blk_mq_tag_set *set, struct request *req,
204 unsigned int hctx_idx, unsigned int numa_node)
205{
206 struct mmc_queue_req *mq_rq = req_to_mmc_queue_req(req);
207 struct mmc_queue *mq = set->driver_data;
208 struct mmc_card *card = mq->card;
209 struct mmc_host *host = card->host;
210
211 mq_rq->sg = mmc_alloc_sg(mmc_get_max_segments(host), GFP_KERNEL);
212 if (!mq_rq->sg)
213 return -ENOMEM;
214
215 return 0;
216}
217
218static void mmc_mq_exit_request(struct blk_mq_tag_set *set, struct request *req,
219 unsigned int hctx_idx)
220{
221 struct mmc_queue_req *mq_rq = req_to_mmc_queue_req(req);
222
223 kfree(mq_rq->sg);
224 mq_rq->sg = NULL;
225}
226
227static blk_status_t mmc_mq_queue_rq(struct blk_mq_hw_ctx *hctx,
228 const struct blk_mq_queue_data *bd)
229{
230 struct request *req = bd->rq;
231 struct request_queue *q = req->q;
232 struct mmc_queue *mq = q->queuedata;
233 struct mmc_card *card = mq->card;
234 struct mmc_host *host = card->host;
235 enum mmc_issue_type issue_type;
236 enum mmc_issued issued;
237 bool get_card, cqe_retune_ok;
238 blk_status_t ret;
239
240 if (mmc_card_removed(mq->card)) {
241 req->rq_flags |= RQF_QUIET;
242 return BLK_STS_IOERR;
243 }
244
245 issue_type = mmc_issue_type(mq, req);
246
247 spin_lock_irq(&mq->lock);
248
249 if (mq->recovery_needed || mq->busy) {
250 spin_unlock_irq(&mq->lock);
251 return BLK_STS_RESOURCE;
252 }
253
254 switch (issue_type) {
255 case MMC_ISSUE_DCMD:
256 if (mmc_cqe_dcmd_busy(mq)) {
257 mq->cqe_busy |= MMC_CQE_DCMD_BUSY;
258 spin_unlock_irq(&mq->lock);
259 return BLK_STS_RESOURCE;
260 }
261 break;
262 case MMC_ISSUE_ASYNC:
263 /*
264 * For MMC host software queue, we only allow 2 requests in
265 * flight to avoid a long latency.
266 */
267 if (host->hsq_enabled && mq->in_flight[issue_type] > 2) {
268 spin_unlock_irq(&mq->lock);
269 return BLK_STS_RESOURCE;
270 }
271 break;
272 default:
273 /*
274 * Timeouts are handled by mmc core, and we don't have a host
275 * API to abort requests, so we can't handle the timeout anyway.
276 * However, when the timeout happens, blk_mq_complete_request()
277 * no longer works (to stop the request disappearing under us).
278 * To avoid racing with that, set a large timeout.
279 */
280 req->timeout = 600 * HZ;
281 break;
282 }
283
284 /* Parallel dispatch of requests is not supported at the moment */
285 mq->busy = true;
286
287 mq->in_flight[issue_type] += 1;
288 get_card = (mmc_tot_in_flight(mq) == 1);
289 cqe_retune_ok = (mmc_cqe_qcnt(mq) == 1);
290
291 spin_unlock_irq(&mq->lock);
292
293 if (!(req->rq_flags & RQF_DONTPREP)) {
294 req_to_mmc_queue_req(req)->retries = 0;
295 req->rq_flags |= RQF_DONTPREP;
296 }
297
298 if (get_card)
299 mmc_get_card(card, &mq->ctx);
300
301 if (host->cqe_enabled) {
302 host->retune_now = host->need_retune && cqe_retune_ok &&
303 !host->hold_retune;
304 }
305
306 blk_mq_start_request(req);
307
308 issued = mmc_blk_mq_issue_rq(mq, req);
309
310 switch (issued) {
311 case MMC_REQ_BUSY:
312 ret = BLK_STS_RESOURCE;
313 break;
314 case MMC_REQ_FAILED_TO_START:
315 ret = BLK_STS_IOERR;
316 break;
317 default:
318 ret = BLK_STS_OK;
319 break;
320 }
321
322 if (issued != MMC_REQ_STARTED) {
323 bool put_card = false;
324
325 spin_lock_irq(&mq->lock);
326 mq->in_flight[issue_type] -= 1;
327 if (mmc_tot_in_flight(mq) == 0)
328 put_card = true;
329 mq->busy = false;
330 spin_unlock_irq(&mq->lock);
331 if (put_card)
332 mmc_put_card(card, &mq->ctx);
333 } else {
334 WRITE_ONCE(mq->busy, false);
335 }
336
337 return ret;
338}
339
340static const struct blk_mq_ops mmc_mq_ops = {
341 .queue_rq = mmc_mq_queue_rq,
342 .init_request = mmc_mq_init_request,
343 .exit_request = mmc_mq_exit_request,
344 .complete = mmc_blk_mq_complete,
345 .timeout = mmc_mq_timed_out,
346};
347
348static void mmc_setup_queue(struct mmc_queue *mq, struct mmc_card *card)
349{
350 struct mmc_host *host = card->host;
351 unsigned block_size = 512;
352
353 blk_queue_flag_set(QUEUE_FLAG_NONROT, mq->queue);
354 blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, mq->queue);
355 if (mmc_can_erase(card))
356 mmc_queue_setup_discard(mq->queue, card);
357
358 if (!mmc_dev(host)->dma_mask || !*mmc_dev(host)->dma_mask)
359 blk_queue_bounce_limit(mq->queue, BLK_BOUNCE_HIGH);
360 blk_queue_max_hw_sectors(mq->queue,
361 min(host->max_blk_count, host->max_req_size / 512));
362 if (host->can_dma_map_merge)
363 WARN(!blk_queue_can_use_dma_map_merging(mq->queue,
364 mmc_dev(host)),
365 "merging was advertised but not possible");
366 blk_queue_max_segments(mq->queue, mmc_get_max_segments(host));
367
368 if (mmc_card_mmc(card) && card->ext_csd.data_sector_size) {
369 block_size = card->ext_csd.data_sector_size;
370 WARN_ON(block_size != 512 && block_size != 4096);
371 }
372
373 blk_queue_logical_block_size(mq->queue, block_size);
374 /*
375 * After blk_queue_can_use_dma_map_merging() was called with succeed,
376 * since it calls blk_queue_virt_boundary(), the mmc should not call
377 * both blk_queue_max_segment_size().
378 */
379 if (!host->can_dma_map_merge)
380 blk_queue_max_segment_size(mq->queue,
381 round_down(host->max_seg_size, block_size));
382
383 dma_set_max_seg_size(mmc_dev(host), queue_max_segment_size(mq->queue));
384
385 INIT_WORK(&mq->recovery_work, mmc_mq_recovery_handler);
386 INIT_WORK(&mq->complete_work, mmc_blk_mq_complete_work);
387
388 mutex_init(&mq->complete_lock);
389
390 init_waitqueue_head(&mq->wait);
391
392 mmc_crypto_setup_queue(mq->queue, host);
393}
394
395static inline bool mmc_merge_capable(struct mmc_host *host)
396{
397 return host->caps2 & MMC_CAP2_MERGE_CAPABLE;
398}
399
400/* Set queue depth to get a reasonable value for q->nr_requests */
401#define MMC_QUEUE_DEPTH 64
402
403/**
404 * mmc_init_queue - initialise a queue structure.
405 * @mq: mmc queue
406 * @card: mmc card to attach this queue
407 *
408 * Initialise a MMC card request queue.
409 */
410struct gendisk *mmc_init_queue(struct mmc_queue *mq, struct mmc_card *card)
411{
412 struct mmc_host *host = card->host;
413 struct gendisk *disk;
414 int ret;
415
416 mq->card = card;
417
418 spin_lock_init(&mq->lock);
419
420 memset(&mq->tag_set, 0, sizeof(mq->tag_set));
421 mq->tag_set.ops = &mmc_mq_ops;
422 /*
423 * The queue depth for CQE must match the hardware because the request
424 * tag is used to index the hardware queue.
425 */
426 if (host->cqe_enabled && !host->hsq_enabled)
427 mq->tag_set.queue_depth =
428 min_t(int, card->ext_csd.cmdq_depth, host->cqe_qdepth);
429 else
430 mq->tag_set.queue_depth = MMC_QUEUE_DEPTH;
431 mq->tag_set.numa_node = NUMA_NO_NODE;
432 mq->tag_set.flags = BLK_MQ_F_SHOULD_MERGE | BLK_MQ_F_BLOCKING;
433 mq->tag_set.nr_hw_queues = 1;
434 mq->tag_set.cmd_size = sizeof(struct mmc_queue_req);
435 mq->tag_set.driver_data = mq;
436
437 /*
438 * Since blk_mq_alloc_tag_set() calls .init_request() of mmc_mq_ops,
439 * the host->can_dma_map_merge should be set before to get max_segs
440 * from mmc_get_max_segments().
441 */
442 if (mmc_merge_capable(host) &&
443 host->max_segs < MMC_DMA_MAP_MERGE_SEGMENTS &&
444 dma_get_merge_boundary(mmc_dev(host)))
445 host->can_dma_map_merge = 1;
446 else
447 host->can_dma_map_merge = 0;
448
449 ret = blk_mq_alloc_tag_set(&mq->tag_set);
450 if (ret)
451 return ERR_PTR(ret);
452
453
454 disk = blk_mq_alloc_disk(&mq->tag_set, mq);
455 if (IS_ERR(disk)) {
456 blk_mq_free_tag_set(&mq->tag_set);
457 return disk;
458 }
459 mq->queue = disk->queue;
460
461 if (mmc_host_is_spi(host) && host->use_spi_crc)
462 blk_queue_flag_set(QUEUE_FLAG_STABLE_WRITES, mq->queue);
463 blk_queue_rq_timeout(mq->queue, 60 * HZ);
464
465 mmc_setup_queue(mq, card);
466 return disk;
467}
468
469void mmc_queue_suspend(struct mmc_queue *mq)
470{
471 blk_mq_quiesce_queue(mq->queue);
472
473 /*
474 * The host remains claimed while there are outstanding requests, so
475 * simply claiming and releasing here ensures there are none.
476 */
477 mmc_claim_host(mq->card->host);
478 mmc_release_host(mq->card->host);
479}
480
481void mmc_queue_resume(struct mmc_queue *mq)
482{
483 blk_mq_unquiesce_queue(mq->queue);
484}
485
486void mmc_cleanup_queue(struct mmc_queue *mq)
487{
488 struct request_queue *q = mq->queue;
489
490 /*
491 * The legacy code handled the possibility of being suspended,
492 * so do that here too.
493 */
494 if (blk_queue_quiesced(q))
495 blk_mq_unquiesce_queue(q);
496
497 /*
498 * If the recovery completes the last (and only remaining) request in
499 * the queue, and the card has been removed, we could end up here with
500 * the recovery not quite finished yet, so cancel it.
501 */
502 cancel_work_sync(&mq->recovery_work);
503
504 blk_mq_free_tag_set(&mq->tag_set);
505
506 /*
507 * A request can be completed before the next request, potentially
508 * leaving a complete_work with nothing to do. Such a work item might
509 * still be queued at this point. Flush it.
510 */
511 flush_work(&mq->complete_work);
512
513 mq->card = NULL;
514}
515
516/*
517 * Prepare the sg list(s) to be handed of to the host driver
518 */
519unsigned int mmc_queue_map_sg(struct mmc_queue *mq, struct mmc_queue_req *mqrq)
520{
521 struct request *req = mmc_queue_req_to_req(mqrq);
522
523 return blk_rq_map_sg(mq->queue, req, mqrq->sg);
524}
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2003 Russell King, All Rights Reserved.
4 * Copyright 2006-2007 Pierre Ossman
5 */
6#include <linux/slab.h>
7#include <linux/module.h>
8#include <linux/blkdev.h>
9#include <linux/freezer.h>
10#include <linux/kthread.h>
11#include <linux/scatterlist.h>
12#include <linux/dma-mapping.h>
13#include <linux/backing-dev.h>
14
15#include <linux/mmc/card.h>
16#include <linux/mmc/host.h>
17
18#include "queue.h"
19#include "block.h"
20#include "core.h"
21#include "card.h"
22#include "host.h"
23
24#define MMC_DMA_MAP_MERGE_SEGMENTS 512
25
26static inline bool mmc_cqe_dcmd_busy(struct mmc_queue *mq)
27{
28 /* Allow only 1 DCMD at a time */
29 return mq->in_flight[MMC_ISSUE_DCMD];
30}
31
32void mmc_cqe_check_busy(struct mmc_queue *mq)
33{
34 if ((mq->cqe_busy & MMC_CQE_DCMD_BUSY) && !mmc_cqe_dcmd_busy(mq))
35 mq->cqe_busy &= ~MMC_CQE_DCMD_BUSY;
36
37 mq->cqe_busy &= ~MMC_CQE_QUEUE_FULL;
38}
39
40static inline bool mmc_cqe_can_dcmd(struct mmc_host *host)
41{
42 return host->caps2 & MMC_CAP2_CQE_DCMD;
43}
44
45static enum mmc_issue_type mmc_cqe_issue_type(struct mmc_host *host,
46 struct request *req)
47{
48 switch (req_op(req)) {
49 case REQ_OP_DRV_IN:
50 case REQ_OP_DRV_OUT:
51 case REQ_OP_DISCARD:
52 case REQ_OP_SECURE_ERASE:
53 return MMC_ISSUE_SYNC;
54 case REQ_OP_FLUSH:
55 return mmc_cqe_can_dcmd(host) ? MMC_ISSUE_DCMD : MMC_ISSUE_SYNC;
56 default:
57 return MMC_ISSUE_ASYNC;
58 }
59}
60
61enum mmc_issue_type mmc_issue_type(struct mmc_queue *mq, struct request *req)
62{
63 struct mmc_host *host = mq->card->host;
64
65 if (mq->use_cqe)
66 return mmc_cqe_issue_type(host, req);
67
68 if (req_op(req) == REQ_OP_READ || req_op(req) == REQ_OP_WRITE)
69 return MMC_ISSUE_ASYNC;
70
71 return MMC_ISSUE_SYNC;
72}
73
74static void __mmc_cqe_recovery_notifier(struct mmc_queue *mq)
75{
76 if (!mq->recovery_needed) {
77 mq->recovery_needed = true;
78 schedule_work(&mq->recovery_work);
79 }
80}
81
82void mmc_cqe_recovery_notifier(struct mmc_request *mrq)
83{
84 struct mmc_queue_req *mqrq = container_of(mrq, struct mmc_queue_req,
85 brq.mrq);
86 struct request *req = mmc_queue_req_to_req(mqrq);
87 struct request_queue *q = req->q;
88 struct mmc_queue *mq = q->queuedata;
89 unsigned long flags;
90
91 spin_lock_irqsave(&mq->lock, flags);
92 __mmc_cqe_recovery_notifier(mq);
93 spin_unlock_irqrestore(&mq->lock, flags);
94}
95
96static enum blk_eh_timer_return mmc_cqe_timed_out(struct request *req)
97{
98 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
99 struct mmc_request *mrq = &mqrq->brq.mrq;
100 struct mmc_queue *mq = req->q->queuedata;
101 struct mmc_host *host = mq->card->host;
102 enum mmc_issue_type issue_type = mmc_issue_type(mq, req);
103 bool recovery_needed = false;
104
105 switch (issue_type) {
106 case MMC_ISSUE_ASYNC:
107 case MMC_ISSUE_DCMD:
108 if (host->cqe_ops->cqe_timeout(host, mrq, &recovery_needed)) {
109 if (recovery_needed)
110 __mmc_cqe_recovery_notifier(mq);
111 return BLK_EH_RESET_TIMER;
112 }
113 /* No timeout (XXX: huh? comment doesn't make much sense) */
114 blk_mq_complete_request(req);
115 return BLK_EH_DONE;
116 default:
117 /* Timeout is handled by mmc core */
118 return BLK_EH_RESET_TIMER;
119 }
120}
121
122static enum blk_eh_timer_return mmc_mq_timed_out(struct request *req,
123 bool reserved)
124{
125 struct request_queue *q = req->q;
126 struct mmc_queue *mq = q->queuedata;
127 unsigned long flags;
128 int ret;
129
130 spin_lock_irqsave(&mq->lock, flags);
131
132 if (mq->recovery_needed || !mq->use_cqe)
133 ret = BLK_EH_RESET_TIMER;
134 else
135 ret = mmc_cqe_timed_out(req);
136
137 spin_unlock_irqrestore(&mq->lock, flags);
138
139 return ret;
140}
141
142static void mmc_mq_recovery_handler(struct work_struct *work)
143{
144 struct mmc_queue *mq = container_of(work, struct mmc_queue,
145 recovery_work);
146 struct request_queue *q = mq->queue;
147
148 mmc_get_card(mq->card, &mq->ctx);
149
150 mq->in_recovery = true;
151
152 if (mq->use_cqe)
153 mmc_blk_cqe_recovery(mq);
154 else
155 mmc_blk_mq_recovery(mq);
156
157 mq->in_recovery = false;
158
159 spin_lock_irq(&mq->lock);
160 mq->recovery_needed = false;
161 spin_unlock_irq(&mq->lock);
162
163 mmc_put_card(mq->card, &mq->ctx);
164
165 blk_mq_run_hw_queues(q, true);
166}
167
168static struct scatterlist *mmc_alloc_sg(int sg_len, gfp_t gfp)
169{
170 struct scatterlist *sg;
171
172 sg = kmalloc_array(sg_len, sizeof(*sg), gfp);
173 if (sg)
174 sg_init_table(sg, sg_len);
175
176 return sg;
177}
178
179static void mmc_queue_setup_discard(struct request_queue *q,
180 struct mmc_card *card)
181{
182 unsigned max_discard;
183
184 max_discard = mmc_calc_max_discard(card);
185 if (!max_discard)
186 return;
187
188 blk_queue_flag_set(QUEUE_FLAG_DISCARD, q);
189 blk_queue_max_discard_sectors(q, max_discard);
190 q->limits.discard_granularity = card->pref_erase << 9;
191 /* granularity must not be greater than max. discard */
192 if (card->pref_erase > max_discard)
193 q->limits.discard_granularity = 0;
194 if (mmc_can_secure_erase_trim(card))
195 blk_queue_flag_set(QUEUE_FLAG_SECERASE, q);
196}
197
198static unsigned int mmc_get_max_segments(struct mmc_host *host)
199{
200 return host->can_dma_map_merge ? MMC_DMA_MAP_MERGE_SEGMENTS :
201 host->max_segs;
202}
203
204/**
205 * mmc_init_request() - initialize the MMC-specific per-request data
206 * @q: the request queue
207 * @req: the request
208 * @gfp: memory allocation policy
209 */
210static int __mmc_init_request(struct mmc_queue *mq, struct request *req,
211 gfp_t gfp)
212{
213 struct mmc_queue_req *mq_rq = req_to_mmc_queue_req(req);
214 struct mmc_card *card = mq->card;
215 struct mmc_host *host = card->host;
216
217 mq_rq->sg = mmc_alloc_sg(mmc_get_max_segments(host), gfp);
218 if (!mq_rq->sg)
219 return -ENOMEM;
220
221 return 0;
222}
223
224static void mmc_exit_request(struct request_queue *q, struct request *req)
225{
226 struct mmc_queue_req *mq_rq = req_to_mmc_queue_req(req);
227
228 kfree(mq_rq->sg);
229 mq_rq->sg = NULL;
230}
231
232static int mmc_mq_init_request(struct blk_mq_tag_set *set, struct request *req,
233 unsigned int hctx_idx, unsigned int numa_node)
234{
235 return __mmc_init_request(set->driver_data, req, GFP_KERNEL);
236}
237
238static void mmc_mq_exit_request(struct blk_mq_tag_set *set, struct request *req,
239 unsigned int hctx_idx)
240{
241 struct mmc_queue *mq = set->driver_data;
242
243 mmc_exit_request(mq->queue, req);
244}
245
246static blk_status_t mmc_mq_queue_rq(struct blk_mq_hw_ctx *hctx,
247 const struct blk_mq_queue_data *bd)
248{
249 struct request *req = bd->rq;
250 struct request_queue *q = req->q;
251 struct mmc_queue *mq = q->queuedata;
252 struct mmc_card *card = mq->card;
253 struct mmc_host *host = card->host;
254 enum mmc_issue_type issue_type;
255 enum mmc_issued issued;
256 bool get_card, cqe_retune_ok;
257 int ret;
258
259 if (mmc_card_removed(mq->card)) {
260 req->rq_flags |= RQF_QUIET;
261 return BLK_STS_IOERR;
262 }
263
264 issue_type = mmc_issue_type(mq, req);
265
266 spin_lock_irq(&mq->lock);
267
268 if (mq->recovery_needed || mq->busy) {
269 spin_unlock_irq(&mq->lock);
270 return BLK_STS_RESOURCE;
271 }
272
273 switch (issue_type) {
274 case MMC_ISSUE_DCMD:
275 if (mmc_cqe_dcmd_busy(mq)) {
276 mq->cqe_busy |= MMC_CQE_DCMD_BUSY;
277 spin_unlock_irq(&mq->lock);
278 return BLK_STS_RESOURCE;
279 }
280 break;
281 case MMC_ISSUE_ASYNC:
282 break;
283 default:
284 /*
285 * Timeouts are handled by mmc core, and we don't have a host
286 * API to abort requests, so we can't handle the timeout anyway.
287 * However, when the timeout happens, blk_mq_complete_request()
288 * no longer works (to stop the request disappearing under us).
289 * To avoid racing with that, set a large timeout.
290 */
291 req->timeout = 600 * HZ;
292 break;
293 }
294
295 /* Parallel dispatch of requests is not supported at the moment */
296 mq->busy = true;
297
298 mq->in_flight[issue_type] += 1;
299 get_card = (mmc_tot_in_flight(mq) == 1);
300 cqe_retune_ok = (mmc_cqe_qcnt(mq) == 1);
301
302 spin_unlock_irq(&mq->lock);
303
304 if (!(req->rq_flags & RQF_DONTPREP)) {
305 req_to_mmc_queue_req(req)->retries = 0;
306 req->rq_flags |= RQF_DONTPREP;
307 }
308
309 if (get_card)
310 mmc_get_card(card, &mq->ctx);
311
312 if (mq->use_cqe) {
313 host->retune_now = host->need_retune && cqe_retune_ok &&
314 !host->hold_retune;
315 }
316
317 blk_mq_start_request(req);
318
319 issued = mmc_blk_mq_issue_rq(mq, req);
320
321 switch (issued) {
322 case MMC_REQ_BUSY:
323 ret = BLK_STS_RESOURCE;
324 break;
325 case MMC_REQ_FAILED_TO_START:
326 ret = BLK_STS_IOERR;
327 break;
328 default:
329 ret = BLK_STS_OK;
330 break;
331 }
332
333 if (issued != MMC_REQ_STARTED) {
334 bool put_card = false;
335
336 spin_lock_irq(&mq->lock);
337 mq->in_flight[issue_type] -= 1;
338 if (mmc_tot_in_flight(mq) == 0)
339 put_card = true;
340 mq->busy = false;
341 spin_unlock_irq(&mq->lock);
342 if (put_card)
343 mmc_put_card(card, &mq->ctx);
344 } else {
345 WRITE_ONCE(mq->busy, false);
346 }
347
348 return ret;
349}
350
351static const struct blk_mq_ops mmc_mq_ops = {
352 .queue_rq = mmc_mq_queue_rq,
353 .init_request = mmc_mq_init_request,
354 .exit_request = mmc_mq_exit_request,
355 .complete = mmc_blk_mq_complete,
356 .timeout = mmc_mq_timed_out,
357};
358
359static void mmc_setup_queue(struct mmc_queue *mq, struct mmc_card *card)
360{
361 struct mmc_host *host = card->host;
362 unsigned block_size = 512;
363
364 blk_queue_flag_set(QUEUE_FLAG_NONROT, mq->queue);
365 blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, mq->queue);
366 if (mmc_can_erase(card))
367 mmc_queue_setup_discard(mq->queue, card);
368
369 if (!mmc_dev(host)->dma_mask || !*mmc_dev(host)->dma_mask)
370 blk_queue_bounce_limit(mq->queue, BLK_BOUNCE_HIGH);
371 blk_queue_max_hw_sectors(mq->queue,
372 min(host->max_blk_count, host->max_req_size / 512));
373 if (host->can_dma_map_merge)
374 WARN(!blk_queue_can_use_dma_map_merging(mq->queue,
375 mmc_dev(host)),
376 "merging was advertised but not possible");
377 blk_queue_max_segments(mq->queue, mmc_get_max_segments(host));
378
379 if (mmc_card_mmc(card))
380 block_size = card->ext_csd.data_sector_size;
381
382 blk_queue_logical_block_size(mq->queue, block_size);
383 /*
384 * After blk_queue_can_use_dma_map_merging() was called with succeed,
385 * since it calls blk_queue_virt_boundary(), the mmc should not call
386 * both blk_queue_max_segment_size().
387 */
388 if (!host->can_dma_map_merge)
389 blk_queue_max_segment_size(mq->queue,
390 round_down(host->max_seg_size, block_size));
391
392 dma_set_max_seg_size(mmc_dev(host), queue_max_segment_size(mq->queue));
393
394 INIT_WORK(&mq->recovery_work, mmc_mq_recovery_handler);
395 INIT_WORK(&mq->complete_work, mmc_blk_mq_complete_work);
396
397 mutex_init(&mq->complete_lock);
398
399 init_waitqueue_head(&mq->wait);
400}
401
402static inline bool mmc_merge_capable(struct mmc_host *host)
403{
404 return host->caps2 & MMC_CAP2_MERGE_CAPABLE;
405}
406
407/* Set queue depth to get a reasonable value for q->nr_requests */
408#define MMC_QUEUE_DEPTH 64
409
410/**
411 * mmc_init_queue - initialise a queue structure.
412 * @mq: mmc queue
413 * @card: mmc card to attach this queue
414 *
415 * Initialise a MMC card request queue.
416 */
417int mmc_init_queue(struct mmc_queue *mq, struct mmc_card *card)
418{
419 struct mmc_host *host = card->host;
420 int ret;
421
422 mq->card = card;
423 mq->use_cqe = host->cqe_enabled;
424
425 spin_lock_init(&mq->lock);
426
427 memset(&mq->tag_set, 0, sizeof(mq->tag_set));
428 mq->tag_set.ops = &mmc_mq_ops;
429 /*
430 * The queue depth for CQE must match the hardware because the request
431 * tag is used to index the hardware queue.
432 */
433 if (mq->use_cqe)
434 mq->tag_set.queue_depth =
435 min_t(int, card->ext_csd.cmdq_depth, host->cqe_qdepth);
436 else
437 mq->tag_set.queue_depth = MMC_QUEUE_DEPTH;
438 mq->tag_set.numa_node = NUMA_NO_NODE;
439 mq->tag_set.flags = BLK_MQ_F_SHOULD_MERGE | BLK_MQ_F_BLOCKING;
440 mq->tag_set.nr_hw_queues = 1;
441 mq->tag_set.cmd_size = sizeof(struct mmc_queue_req);
442 mq->tag_set.driver_data = mq;
443
444 /*
445 * Since blk_mq_alloc_tag_set() calls .init_request() of mmc_mq_ops,
446 * the host->can_dma_map_merge should be set before to get max_segs
447 * from mmc_get_max_segments().
448 */
449 if (mmc_merge_capable(host) &&
450 host->max_segs < MMC_DMA_MAP_MERGE_SEGMENTS &&
451 dma_get_merge_boundary(mmc_dev(host)))
452 host->can_dma_map_merge = 1;
453 else
454 host->can_dma_map_merge = 0;
455
456 ret = blk_mq_alloc_tag_set(&mq->tag_set);
457 if (ret)
458 return ret;
459
460 mq->queue = blk_mq_init_queue(&mq->tag_set);
461 if (IS_ERR(mq->queue)) {
462 ret = PTR_ERR(mq->queue);
463 goto free_tag_set;
464 }
465
466 if (mmc_host_is_spi(host) && host->use_spi_crc)
467 mq->queue->backing_dev_info->capabilities |=
468 BDI_CAP_STABLE_WRITES;
469
470 mq->queue->queuedata = mq;
471 blk_queue_rq_timeout(mq->queue, 60 * HZ);
472
473 mmc_setup_queue(mq, card);
474 return 0;
475
476free_tag_set:
477 blk_mq_free_tag_set(&mq->tag_set);
478 return ret;
479}
480
481void mmc_queue_suspend(struct mmc_queue *mq)
482{
483 blk_mq_quiesce_queue(mq->queue);
484
485 /*
486 * The host remains claimed while there are outstanding requests, so
487 * simply claiming and releasing here ensures there are none.
488 */
489 mmc_claim_host(mq->card->host);
490 mmc_release_host(mq->card->host);
491}
492
493void mmc_queue_resume(struct mmc_queue *mq)
494{
495 blk_mq_unquiesce_queue(mq->queue);
496}
497
498void mmc_cleanup_queue(struct mmc_queue *mq)
499{
500 struct request_queue *q = mq->queue;
501
502 /*
503 * The legacy code handled the possibility of being suspended,
504 * so do that here too.
505 */
506 if (blk_queue_quiesced(q))
507 blk_mq_unquiesce_queue(q);
508
509 blk_cleanup_queue(q);
510 blk_mq_free_tag_set(&mq->tag_set);
511
512 /*
513 * A request can be completed before the next request, potentially
514 * leaving a complete_work with nothing to do. Such a work item might
515 * still be queued at this point. Flush it.
516 */
517 flush_work(&mq->complete_work);
518
519 mq->card = NULL;
520}
521
522/*
523 * Prepare the sg list(s) to be handed of to the host driver
524 */
525unsigned int mmc_queue_map_sg(struct mmc_queue *mq, struct mmc_queue_req *mqrq)
526{
527 struct request *req = mmc_queue_req_to_req(mqrq);
528
529 return blk_rq_map_sg(mq->queue, req, mqrq->sg);
530}