1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) 2003 Russell King, All Rights Reserved.
4 * Copyright 2006-2007 Pierre Ossman
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>
14 #include <linux/mmc/card.h>
15 #include <linux/mmc/host.h>
24 #define MMC_DMA_MAP_MERGE_SEGMENTS 512
26 static inline bool mmc_cqe_dcmd_busy(struct mmc_queue *mq)
28 /* Allow only 1 DCMD at a time */
29 return mq->in_flight[MMC_ISSUE_DCMD];
32 void mmc_cqe_check_busy(struct mmc_queue *mq)
34 if ((mq->cqe_busy & MMC_CQE_DCMD_BUSY) && !mmc_cqe_dcmd_busy(mq))
35 mq->cqe_busy &= ~MMC_CQE_DCMD_BUSY;
38 static inline bool mmc_cqe_can_dcmd(struct mmc_host *host)
40 return host->caps2 & MMC_CAP2_CQE_DCMD;
43 static enum mmc_issue_type mmc_cqe_issue_type(struct mmc_host *host,
46 switch (req_op(req)) {
50 case REQ_OP_SECURE_ERASE:
51 return MMC_ISSUE_SYNC;
53 return mmc_cqe_can_dcmd(host) ? MMC_ISSUE_DCMD : MMC_ISSUE_SYNC;
55 return MMC_ISSUE_ASYNC;
59 enum mmc_issue_type mmc_issue_type(struct mmc_queue *mq, struct request *req)
61 struct mmc_host *host = mq->card->host;
63 if (host->cqe_enabled && !host->hsq_enabled)
64 return mmc_cqe_issue_type(host, req);
66 if (req_op(req) == REQ_OP_READ || req_op(req) == REQ_OP_WRITE)
67 return MMC_ISSUE_ASYNC;
69 return MMC_ISSUE_SYNC;
72 static void __mmc_cqe_recovery_notifier(struct mmc_queue *mq)
74 if (!mq->recovery_needed) {
75 mq->recovery_needed = true;
76 schedule_work(&mq->recovery_work);
80 void mmc_cqe_recovery_notifier(struct mmc_request *mrq)
82 struct mmc_queue_req *mqrq = container_of(mrq, struct mmc_queue_req,
84 struct request *req = mmc_queue_req_to_req(mqrq);
85 struct request_queue *q = req->q;
86 struct mmc_queue *mq = q->queuedata;
89 spin_lock_irqsave(&mq->lock, flags);
90 __mmc_cqe_recovery_notifier(mq);
91 spin_unlock_irqrestore(&mq->lock, flags);
94 static enum blk_eh_timer_return mmc_cqe_timed_out(struct request *req)
96 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
97 struct mmc_request *mrq = &mqrq->brq.mrq;
98 struct mmc_queue *mq = req->q->queuedata;
99 struct mmc_host *host = mq->card->host;
100 enum mmc_issue_type issue_type = mmc_issue_type(mq, req);
101 bool recovery_needed = false;
103 switch (issue_type) {
104 case MMC_ISSUE_ASYNC:
106 if (host->cqe_ops->cqe_timeout(host, mrq, &recovery_needed)) {
108 mmc_cqe_recovery_notifier(mrq);
109 return BLK_EH_RESET_TIMER;
111 /* The request has gone already */
114 /* Timeout is handled by mmc core */
115 return BLK_EH_RESET_TIMER;
119 static enum blk_eh_timer_return mmc_mq_timed_out(struct request *req,
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;
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);
133 return ignore_tout ? BLK_EH_RESET_TIMER : mmc_cqe_timed_out(req);
136 static void mmc_mq_recovery_handler(struct work_struct *work)
138 struct mmc_queue *mq = container_of(work, struct mmc_queue,
140 struct request_queue *q = mq->queue;
141 struct mmc_host *host = mq->card->host;
143 mmc_get_card(mq->card, &mq->ctx);
145 mq->in_recovery = true;
147 if (host->cqe_enabled && !host->hsq_enabled)
148 mmc_blk_cqe_recovery(mq);
150 mmc_blk_mq_recovery(mq);
152 mq->in_recovery = false;
154 spin_lock_irq(&mq->lock);
155 mq->recovery_needed = false;
156 spin_unlock_irq(&mq->lock);
158 if (host->hsq_enabled)
159 host->cqe_ops->cqe_recovery_finish(host);
161 mmc_put_card(mq->card, &mq->ctx);
163 blk_mq_run_hw_queues(q, true);
166 static struct scatterlist *mmc_alloc_sg(int sg_len, gfp_t gfp)
168 struct scatterlist *sg;
170 sg = kmalloc_array(sg_len, sizeof(*sg), gfp);
172 sg_init_table(sg, sg_len);
177 static void mmc_queue_setup_discard(struct request_queue *q,
178 struct mmc_card *card)
180 unsigned max_discard;
182 max_discard = mmc_calc_max_discard(card);
186 blk_queue_flag_set(QUEUE_FLAG_DISCARD, q);
187 blk_queue_max_discard_sectors(q, max_discard);
188 q->limits.discard_granularity = card->pref_erase << 9;
189 /* granularity must not be greater than max. discard */
190 if (card->pref_erase > max_discard)
191 q->limits.discard_granularity = SECTOR_SIZE;
192 if (mmc_can_secure_erase_trim(card))
193 blk_queue_flag_set(QUEUE_FLAG_SECERASE, q);
196 static unsigned int mmc_get_max_segments(struct mmc_host *host)
198 return host->can_dma_map_merge ? MMC_DMA_MAP_MERGE_SEGMENTS :
203 * mmc_init_request() - initialize the MMC-specific per-request data
204 * @mq: the request queue
206 * @gfp: memory allocation policy
208 static int __mmc_init_request(struct mmc_queue *mq, struct request *req,
211 struct mmc_queue_req *mq_rq = req_to_mmc_queue_req(req);
212 struct mmc_card *card = mq->card;
213 struct mmc_host *host = card->host;
215 mq_rq->sg = mmc_alloc_sg(mmc_get_max_segments(host), gfp);
222 static void mmc_exit_request(struct request_queue *q, struct request *req)
224 struct mmc_queue_req *mq_rq = req_to_mmc_queue_req(req);
230 static int mmc_mq_init_request(struct blk_mq_tag_set *set, struct request *req,
231 unsigned int hctx_idx, unsigned int numa_node)
233 return __mmc_init_request(set->driver_data, req, GFP_KERNEL);
236 static void mmc_mq_exit_request(struct blk_mq_tag_set *set, struct request *req,
237 unsigned int hctx_idx)
239 struct mmc_queue *mq = set->driver_data;
241 mmc_exit_request(mq->queue, req);
244 static blk_status_t mmc_mq_queue_rq(struct blk_mq_hw_ctx *hctx,
245 const struct blk_mq_queue_data *bd)
247 struct request *req = bd->rq;
248 struct request_queue *q = req->q;
249 struct mmc_queue *mq = q->queuedata;
250 struct mmc_card *card = mq->card;
251 struct mmc_host *host = card->host;
252 enum mmc_issue_type issue_type;
253 enum mmc_issued issued;
254 bool get_card, cqe_retune_ok;
257 if (mmc_card_removed(mq->card)) {
258 req->rq_flags |= RQF_QUIET;
259 return BLK_STS_IOERR;
262 issue_type = mmc_issue_type(mq, req);
264 spin_lock_irq(&mq->lock);
266 if (mq->recovery_needed || mq->busy) {
267 spin_unlock_irq(&mq->lock);
268 return BLK_STS_RESOURCE;
271 switch (issue_type) {
273 if (mmc_cqe_dcmd_busy(mq)) {
274 mq->cqe_busy |= MMC_CQE_DCMD_BUSY;
275 spin_unlock_irq(&mq->lock);
276 return BLK_STS_RESOURCE;
279 case MMC_ISSUE_ASYNC:
281 * For MMC host software queue, we only allow 2 requests in
282 * flight to avoid a long latency.
284 if (host->hsq_enabled && mq->in_flight[issue_type] > 2) {
285 spin_unlock_irq(&mq->lock);
286 return BLK_STS_RESOURCE;
291 * Timeouts are handled by mmc core, and we don't have a host
292 * API to abort requests, so we can't handle the timeout anyway.
293 * However, when the timeout happens, blk_mq_complete_request()
294 * no longer works (to stop the request disappearing under us).
295 * To avoid racing with that, set a large timeout.
297 req->timeout = 600 * HZ;
301 /* Parallel dispatch of requests is not supported at the moment */
304 mq->in_flight[issue_type] += 1;
305 get_card = (mmc_tot_in_flight(mq) == 1);
306 cqe_retune_ok = (mmc_cqe_qcnt(mq) == 1);
308 spin_unlock_irq(&mq->lock);
310 if (!(req->rq_flags & RQF_DONTPREP)) {
311 req_to_mmc_queue_req(req)->retries = 0;
312 req->rq_flags |= RQF_DONTPREP;
316 mmc_get_card(card, &mq->ctx);
318 if (host->cqe_enabled) {
319 host->retune_now = host->need_retune && cqe_retune_ok &&
323 blk_mq_start_request(req);
325 issued = mmc_blk_mq_issue_rq(mq, req);
329 ret = BLK_STS_RESOURCE;
331 case MMC_REQ_FAILED_TO_START:
339 if (issued != MMC_REQ_STARTED) {
340 bool put_card = false;
342 spin_lock_irq(&mq->lock);
343 mq->in_flight[issue_type] -= 1;
344 if (mmc_tot_in_flight(mq) == 0)
347 spin_unlock_irq(&mq->lock);
349 mmc_put_card(card, &mq->ctx);
351 WRITE_ONCE(mq->busy, false);
357 static const struct blk_mq_ops mmc_mq_ops = {
358 .queue_rq = mmc_mq_queue_rq,
359 .init_request = mmc_mq_init_request,
360 .exit_request = mmc_mq_exit_request,
361 .complete = mmc_blk_mq_complete,
362 .timeout = mmc_mq_timed_out,
365 static void mmc_setup_queue(struct mmc_queue *mq, struct mmc_card *card)
367 struct mmc_host *host = card->host;
368 unsigned block_size = 512;
370 blk_queue_flag_set(QUEUE_FLAG_NONROT, mq->queue);
371 blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, mq->queue);
372 if (mmc_can_erase(card))
373 mmc_queue_setup_discard(mq->queue, card);
375 if (!mmc_dev(host)->dma_mask || !*mmc_dev(host)->dma_mask)
376 blk_queue_bounce_limit(mq->queue, BLK_BOUNCE_HIGH);
377 blk_queue_max_hw_sectors(mq->queue,
378 min(host->max_blk_count, host->max_req_size / 512));
379 if (host->can_dma_map_merge)
380 WARN(!blk_queue_can_use_dma_map_merging(mq->queue,
382 "merging was advertised but not possible");
383 blk_queue_max_segments(mq->queue, mmc_get_max_segments(host));
385 if (mmc_card_mmc(card) && card->ext_csd.data_sector_size) {
386 block_size = card->ext_csd.data_sector_size;
387 WARN_ON(block_size != 512 && block_size != 4096);
390 blk_queue_logical_block_size(mq->queue, block_size);
392 * After blk_queue_can_use_dma_map_merging() was called with succeed,
393 * since it calls blk_queue_virt_boundary(), the mmc should not call
394 * both blk_queue_max_segment_size().
396 if (!host->can_dma_map_merge)
397 blk_queue_max_segment_size(mq->queue,
398 round_down(host->max_seg_size, block_size));
400 dma_set_max_seg_size(mmc_dev(host), queue_max_segment_size(mq->queue));
402 INIT_WORK(&mq->recovery_work, mmc_mq_recovery_handler);
403 INIT_WORK(&mq->complete_work, mmc_blk_mq_complete_work);
405 mutex_init(&mq->complete_lock);
407 init_waitqueue_head(&mq->wait);
409 mmc_crypto_setup_queue(mq->queue, host);
412 static inline bool mmc_merge_capable(struct mmc_host *host)
414 return host->caps2 & MMC_CAP2_MERGE_CAPABLE;
417 /* Set queue depth to get a reasonable value for q->nr_requests */
418 #define MMC_QUEUE_DEPTH 64
421 * mmc_init_queue - initialise a queue structure.
423 * @card: mmc card to attach this queue
425 * Initialise a MMC card request queue.
427 struct gendisk *mmc_init_queue(struct mmc_queue *mq, struct mmc_card *card)
429 struct mmc_host *host = card->host;
430 struct gendisk *disk;
435 spin_lock_init(&mq->lock);
437 memset(&mq->tag_set, 0, sizeof(mq->tag_set));
438 mq->tag_set.ops = &mmc_mq_ops;
440 * The queue depth for CQE must match the hardware because the request
441 * tag is used to index the hardware queue.
443 if (host->cqe_enabled && !host->hsq_enabled)
444 mq->tag_set.queue_depth =
445 min_t(int, card->ext_csd.cmdq_depth, host->cqe_qdepth);
447 mq->tag_set.queue_depth = MMC_QUEUE_DEPTH;
448 mq->tag_set.numa_node = NUMA_NO_NODE;
449 mq->tag_set.flags = BLK_MQ_F_SHOULD_MERGE | BLK_MQ_F_BLOCKING;
450 mq->tag_set.nr_hw_queues = 1;
451 mq->tag_set.cmd_size = sizeof(struct mmc_queue_req);
452 mq->tag_set.driver_data = mq;
455 * Since blk_mq_alloc_tag_set() calls .init_request() of mmc_mq_ops,
456 * the host->can_dma_map_merge should be set before to get max_segs
457 * from mmc_get_max_segments().
459 if (mmc_merge_capable(host) &&
460 host->max_segs < MMC_DMA_MAP_MERGE_SEGMENTS &&
461 dma_get_merge_boundary(mmc_dev(host)))
462 host->can_dma_map_merge = 1;
464 host->can_dma_map_merge = 0;
466 ret = blk_mq_alloc_tag_set(&mq->tag_set);
471 disk = blk_mq_alloc_disk(&mq->tag_set, mq);
473 blk_mq_free_tag_set(&mq->tag_set);
476 mq->queue = disk->queue;
478 if (mmc_host_is_spi(host) && host->use_spi_crc)
479 blk_queue_flag_set(QUEUE_FLAG_STABLE_WRITES, mq->queue);
480 blk_queue_rq_timeout(mq->queue, 60 * HZ);
482 mmc_setup_queue(mq, card);
486 void mmc_queue_suspend(struct mmc_queue *mq)
488 blk_mq_quiesce_queue(mq->queue);
491 * The host remains claimed while there are outstanding requests, so
492 * simply claiming and releasing here ensures there are none.
494 mmc_claim_host(mq->card->host);
495 mmc_release_host(mq->card->host);
498 void mmc_queue_resume(struct mmc_queue *mq)
500 blk_mq_unquiesce_queue(mq->queue);
503 void mmc_cleanup_queue(struct mmc_queue *mq)
505 struct request_queue *q = mq->queue;
508 * The legacy code handled the possibility of being suspended,
509 * so do that here too.
511 if (blk_queue_quiesced(q))
512 blk_mq_unquiesce_queue(q);
514 blk_cleanup_queue(q);
515 blk_mq_free_tag_set(&mq->tag_set);
518 * A request can be completed before the next request, potentially
519 * leaving a complete_work with nothing to do. Such a work item might
520 * still be queued at this point. Flush it.
522 flush_work(&mq->complete_work);
528 * Prepare the sg list(s) to be handed of to the host driver
530 unsigned int mmc_queue_map_sg(struct mmc_queue *mq, struct mmc_queue_req *mqrq)
532 struct request *req = mmc_queue_req_to_req(mqrq);
534 return blk_rq_map_sg(mq->queue, req, mqrq->sg);