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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
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 return MMC_ISSUE_SYNC;
52 case REQ_OP_FLUSH:
53 return mmc_cqe_can_dcmd(host) ? MMC_ISSUE_DCMD : MMC_ISSUE_SYNC;
54 default:
55 return MMC_ISSUE_ASYNC;
56 }
57}
58
59enum mmc_issue_type mmc_issue_type(struct mmc_queue *mq, struct request *req)
60{
61 struct mmc_host *host = mq->card->host;
62
63 if (host->cqe_enabled && !host->hsq_enabled)
64 return mmc_cqe_issue_type(host, req);
65
66 if (req_op(req) == REQ_OP_READ || req_op(req) == REQ_OP_WRITE)
67 return MMC_ISSUE_ASYNC;
68
69 return MMC_ISSUE_SYNC;
70}
71
72static void __mmc_cqe_recovery_notifier(struct mmc_queue *mq)
73{
74 if (!mq->recovery_needed) {
75 mq->recovery_needed = true;
76 schedule_work(&mq->recovery_work);
77 }
78}
79
80void mmc_cqe_recovery_notifier(struct mmc_request *mrq)
81{
82 struct mmc_queue_req *mqrq = container_of(mrq, struct mmc_queue_req,
83 brq.mrq);
84 struct request *req = mmc_queue_req_to_req(mqrq);
85 struct request_queue *q = req->q;
86 struct mmc_queue *mq = q->queuedata;
87 unsigned long flags;
88
89 spin_lock_irqsave(&mq->lock, flags);
90 __mmc_cqe_recovery_notifier(mq);
91 spin_unlock_irqrestore(&mq->lock, flags);
92}
93
94static enum blk_eh_timer_return mmc_cqe_timed_out(struct request *req)
95{
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;
102
103 switch (issue_type) {
104 case MMC_ISSUE_ASYNC:
105 case MMC_ISSUE_DCMD:
106 if (host->cqe_ops->cqe_timeout(host, mrq, &recovery_needed)) {
107 if (recovery_needed)
108 mmc_cqe_recovery_notifier(mrq);
109 return BLK_EH_RESET_TIMER;
110 }
111
112 return BLK_EH_DONE;
113 default:
114
115 return BLK_EH_RESET_TIMER;
116 }
117}
118
119static enum blk_eh_timer_return mmc_mq_timed_out(struct request *req,
120 bool reserved)
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_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
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);
194}
195
196static unsigned short mmc_get_max_segments(struct mmc_host *host)
197{
198 return host->can_dma_map_merge ? MMC_DMA_MAP_MERGE_SEGMENTS :
199 host->max_segs;
200}
201
202static int mmc_mq_init_request(struct blk_mq_tag_set *set, struct request *req,
203 unsigned int hctx_idx, unsigned int numa_node)
204{
205 struct mmc_queue_req *mq_rq = req_to_mmc_queue_req(req);
206 struct mmc_queue *mq = set->driver_data;
207 struct mmc_card *card = mq->card;
208 struct mmc_host *host = card->host;
209
210 mq_rq->sg = mmc_alloc_sg(mmc_get_max_segments(host), GFP_KERNEL);
211 if (!mq_rq->sg)
212 return -ENOMEM;
213
214 return 0;
215}
216
217static void mmc_mq_exit_request(struct blk_mq_tag_set *set, struct request *req,
218 unsigned int hctx_idx)
219{
220 struct mmc_queue_req *mq_rq = req_to_mmc_queue_req(req);
221
222 kfree(mq_rq->sg);
223 mq_rq->sg = NULL;
224}
225
226static blk_status_t mmc_mq_queue_rq(struct blk_mq_hw_ctx *hctx,
227 const struct blk_mq_queue_data *bd)
228{
229 struct request *req = bd->rq;
230 struct request_queue *q = req->q;
231 struct mmc_queue *mq = q->queuedata;
232 struct mmc_card *card = mq->card;
233 struct mmc_host *host = card->host;
234 enum mmc_issue_type issue_type;
235 enum mmc_issued issued;
236 bool get_card, cqe_retune_ok;
237 int ret;
238
239 if (mmc_card_removed(mq->card)) {
240 req->rq_flags |= RQF_QUIET;
241 return BLK_STS_IOERR;
242 }
243
244 issue_type = mmc_issue_type(mq, req);
245
246 spin_lock_irq(&mq->lock);
247
248 if (mq->recovery_needed || mq->busy) {
249 spin_unlock_irq(&mq->lock);
250 return BLK_STS_RESOURCE;
251 }
252
253 switch (issue_type) {
254 case MMC_ISSUE_DCMD:
255 if (mmc_cqe_dcmd_busy(mq)) {
256 mq->cqe_busy |= MMC_CQE_DCMD_BUSY;
257 spin_unlock_irq(&mq->lock);
258 return BLK_STS_RESOURCE;
259 }
260 break;
261 case MMC_ISSUE_ASYNC:
262
263
264
265
266 if (host->hsq_enabled && mq->in_flight[issue_type] > 2) {
267 spin_unlock_irq(&mq->lock);
268 return BLK_STS_RESOURCE;
269 }
270 break;
271 default:
272
273
274
275
276
277
278
279 req->timeout = 600 * HZ;
280 break;
281 }
282
283
284 mq->busy = true;
285
286 mq->in_flight[issue_type] += 1;
287 get_card = (mmc_tot_in_flight(mq) == 1);
288 cqe_retune_ok = (mmc_cqe_qcnt(mq) == 1);
289
290 spin_unlock_irq(&mq->lock);
291
292 if (!(req->rq_flags & RQF_DONTPREP)) {
293 req_to_mmc_queue_req(req)->retries = 0;
294 req->rq_flags |= RQF_DONTPREP;
295 }
296
297 if (get_card)
298 mmc_get_card(card, &mq->ctx);
299
300 if (host->cqe_enabled) {
301 host->retune_now = host->need_retune && cqe_retune_ok &&
302 !host->hold_retune;
303 }
304
305 blk_mq_start_request(req);
306
307 issued = mmc_blk_mq_issue_rq(mq, req);
308
309 switch (issued) {
310 case MMC_REQ_BUSY:
311 ret = BLK_STS_RESOURCE;
312 break;
313 case MMC_REQ_FAILED_TO_START:
314 ret = BLK_STS_IOERR;
315 break;
316 default:
317 ret = BLK_STS_OK;
318 break;
319 }
320
321 if (issued != MMC_REQ_STARTED) {
322 bool put_card = false;
323
324 spin_lock_irq(&mq->lock);
325 mq->in_flight[issue_type] -= 1;
326 if (mmc_tot_in_flight(mq) == 0)
327 put_card = true;
328 mq->busy = false;
329 spin_unlock_irq(&mq->lock);
330 if (put_card)
331 mmc_put_card(card, &mq->ctx);
332 } else {
333 WRITE_ONCE(mq->busy, false);
334 }
335
336 return ret;
337}
338
339static const struct blk_mq_ops mmc_mq_ops = {
340 .queue_rq = mmc_mq_queue_rq,
341 .init_request = mmc_mq_init_request,
342 .exit_request = mmc_mq_exit_request,
343 .complete = mmc_blk_mq_complete,
344 .timeout = mmc_mq_timed_out,
345};
346
347static void mmc_setup_queue(struct mmc_queue *mq, struct mmc_card *card)
348{
349 struct mmc_host *host = card->host;
350 unsigned block_size = 512;
351
352 blk_queue_flag_set(QUEUE_FLAG_NONROT, mq->queue);
353 blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, mq->queue);
354 if (mmc_can_erase(card))
355 mmc_queue_setup_discard(mq->queue, card);
356
357 if (!mmc_dev(host)->dma_mask || !*mmc_dev(host)->dma_mask)
358 blk_queue_bounce_limit(mq->queue, BLK_BOUNCE_HIGH);
359 blk_queue_max_hw_sectors(mq->queue,
360 min(host->max_blk_count, host->max_req_size / 512));
361 if (host->can_dma_map_merge)
362 WARN(!blk_queue_can_use_dma_map_merging(mq->queue,
363 mmc_dev(host)),
364 "merging was advertised but not possible");
365 blk_queue_max_segments(mq->queue, mmc_get_max_segments(host));
366
367 if (mmc_card_mmc(card) && card->ext_csd.data_sector_size) {
368 block_size = card->ext_csd.data_sector_size;
369 WARN_ON(block_size != 512 && block_size != 4096);
370 }
371
372 blk_queue_logical_block_size(mq->queue, block_size);
373
374
375
376
377
378 if (!host->can_dma_map_merge)
379 blk_queue_max_segment_size(mq->queue,
380 round_down(host->max_seg_size, block_size));
381
382 dma_set_max_seg_size(mmc_dev(host), queue_max_segment_size(mq->queue));
383
384 INIT_WORK(&mq->recovery_work, mmc_mq_recovery_handler);
385 INIT_WORK(&mq->complete_work, mmc_blk_mq_complete_work);
386
387 mutex_init(&mq->complete_lock);
388
389 init_waitqueue_head(&mq->wait);
390
391 mmc_crypto_setup_queue(mq->queue, host);
392}
393
394static inline bool mmc_merge_capable(struct mmc_host *host)
395{
396 return host->caps2 & MMC_CAP2_MERGE_CAPABLE;
397}
398
399
400#define MMC_QUEUE_DEPTH 64
401
402
403
404
405
406
407
408
409struct gendisk *mmc_init_queue(struct mmc_queue *mq, struct mmc_card *card)
410{
411 struct mmc_host *host = card->host;
412 struct gendisk *disk;
413 int ret;
414
415 mq->card = card;
416
417 spin_lock_init(&mq->lock);
418
419 memset(&mq->tag_set, 0, sizeof(mq->tag_set));
420 mq->tag_set.ops = &mmc_mq_ops;
421
422
423
424
425 if (host->cqe_enabled && !host->hsq_enabled)
426 mq->tag_set.queue_depth =
427 min_t(int, card->ext_csd.cmdq_depth, host->cqe_qdepth);
428 else
429 mq->tag_set.queue_depth = MMC_QUEUE_DEPTH;
430 mq->tag_set.numa_node = NUMA_NO_NODE;
431 mq->tag_set.flags = BLK_MQ_F_SHOULD_MERGE | BLK_MQ_F_BLOCKING;
432 mq->tag_set.nr_hw_queues = 1;
433 mq->tag_set.cmd_size = sizeof(struct mmc_queue_req);
434 mq->tag_set.driver_data = mq;
435
436
437
438
439
440
441 if (mmc_merge_capable(host) &&
442 host->max_segs < MMC_DMA_MAP_MERGE_SEGMENTS &&
443 dma_get_merge_boundary(mmc_dev(host)))
444 host->can_dma_map_merge = 1;
445 else
446 host->can_dma_map_merge = 0;
447
448 ret = blk_mq_alloc_tag_set(&mq->tag_set);
449 if (ret)
450 return ERR_PTR(ret);
451
452
453 disk = blk_mq_alloc_disk(&mq->tag_set, mq);
454 if (IS_ERR(disk)) {
455 blk_mq_free_tag_set(&mq->tag_set);
456 return disk;
457 }
458 mq->queue = disk->queue;
459
460 if (mmc_host_is_spi(host) && host->use_spi_crc)
461 blk_queue_flag_set(QUEUE_FLAG_STABLE_WRITES, mq->queue);
462 blk_queue_rq_timeout(mq->queue, 60 * HZ);
463
464 mmc_setup_queue(mq, card);
465 return disk;
466}
467
468void mmc_queue_suspend(struct mmc_queue *mq)
469{
470 blk_mq_quiesce_queue(mq->queue);
471
472
473
474
475
476 mmc_claim_host(mq->card->host);
477 mmc_release_host(mq->card->host);
478}
479
480void mmc_queue_resume(struct mmc_queue *mq)
481{
482 blk_mq_unquiesce_queue(mq->queue);
483}
484
485void mmc_cleanup_queue(struct mmc_queue *mq)
486{
487 struct request_queue *q = mq->queue;
488
489
490
491
492
493 if (blk_queue_quiesced(q))
494 blk_mq_unquiesce_queue(q);
495
496 blk_cleanup_queue(q);
497 blk_mq_free_tag_set(&mq->tag_set);
498
499
500
501
502
503
504 flush_work(&mq->complete_work);
505
506 mq->card = NULL;
507}
508
509
510
511
512unsigned int mmc_queue_map_sg(struct mmc_queue *mq, struct mmc_queue_req *mqrq)
513{
514 struct request *req = mmc_queue_req_to_req(mqrq);
515
516 return blk_rq_map_sg(mq->queue, req, mqrq->sg);
517}
518