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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}