Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
70f10482 | 2 | * linux/drivers/mmc/card/queue.c |
1da177e4 LT |
3 | * |
4 | * Copyright (C) 2003 Russell King, All Rights Reserved. | |
98ac2162 | 5 | * Copyright 2006-2007 Pierre Ossman |
1da177e4 LT |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | * | |
11 | */ | |
5a0e3ad6 | 12 | #include <linux/slab.h> |
1da177e4 LT |
13 | #include <linux/module.h> |
14 | #include <linux/blkdev.h> | |
83144186 | 15 | #include <linux/freezer.h> |
87598a2b | 16 | #include <linux/kthread.h> |
45711f1a | 17 | #include <linux/scatterlist.h> |
8e0cb8a1 | 18 | #include <linux/dma-mapping.h> |
1da177e4 LT |
19 | |
20 | #include <linux/mmc/card.h> | |
21 | #include <linux/mmc/host.h> | |
98ac2162 | 22 | #include "queue.h" |
1da177e4 | 23 | |
98ccf149 PO |
24 | #define MMC_QUEUE_BOUNCESZ 65536 |
25 | ||
1da177e4 | 26 | /* |
9c9f2d63 | 27 | * Prepare a MMC request. This just filters out odd stuff. |
1da177e4 LT |
28 | */ |
29 | static int mmc_prep_request(struct request_queue *q, struct request *req) | |
30 | { | |
a8ad82cc SRT |
31 | struct mmc_queue *mq = q->queuedata; |
32 | ||
9c9f2d63 | 33 | /* |
bd788c96 | 34 | * We only like normal block requests and discards. |
9c9f2d63 | 35 | */ |
7afafc8a AH |
36 | if (req->cmd_type != REQ_TYPE_FS && req_op(req) != REQ_OP_DISCARD && |
37 | req_op(req) != REQ_OP_SECURE_ERASE) { | |
1da177e4 | 38 | blk_dump_rq_flags(req, "MMC bad request"); |
9c9f2d63 | 39 | return BLKPREP_KILL; |
1da177e4 LT |
40 | } |
41 | ||
4e93b9a6 | 42 | if (mq && (mmc_card_removed(mq->card) || mmc_access_rpmb(mq))) |
a8ad82cc SRT |
43 | return BLKPREP_KILL; |
44 | ||
9c9f2d63 | 45 | req->cmd_flags |= REQ_DONTPREP; |
1da177e4 | 46 | |
9c9f2d63 | 47 | return BLKPREP_OK; |
1da177e4 LT |
48 | } |
49 | ||
50 | static int mmc_queue_thread(void *d) | |
51 | { | |
52 | struct mmc_queue *mq = d; | |
53 | struct request_queue *q = mq->queue; | |
1da177e4 | 54 | |
83144186 | 55 | current->flags |= PF_MEMALLOC; |
1da177e4 | 56 | |
1da177e4 | 57 | down(&mq->thread_sem); |
1da177e4 LT |
58 | do { |
59 | struct request *req = NULL; | |
60 | ||
61 | spin_lock_irq(q->queue_lock); | |
62 | set_current_state(TASK_INTERRUPTIBLE); | |
7eaceacc | 63 | req = blk_fetch_request(q); |
97868a2b | 64 | mq->mqrq_cur->req = req; |
1da177e4 LT |
65 | spin_unlock_irq(q->queue_lock); |
66 | ||
ee8a43a5 | 67 | if (req || mq->mqrq_prev->req) { |
869c5548 AH |
68 | bool req_is_special = mmc_req_is_special(req); |
69 | ||
ee8a43a5 PF |
70 | set_current_state(TASK_RUNNING); |
71 | mq->issue_fn(mq, req); | |
a8c27c0b | 72 | cond_resched(); |
2220eedf KD |
73 | if (mq->flags & MMC_QUEUE_NEW_REQUEST) { |
74 | mq->flags &= ~MMC_QUEUE_NEW_REQUEST; | |
75 | continue; /* fetch again */ | |
76 | } | |
45c5a914 SJ |
77 | |
78 | /* | |
79 | * Current request becomes previous request | |
80 | * and vice versa. | |
369d321e SJ |
81 | * In case of special requests, current request |
82 | * has been finished. Do not assign it to previous | |
83 | * request. | |
45c5a914 | 84 | */ |
869c5548 | 85 | if (req_is_special) |
369d321e SJ |
86 | mq->mqrq_cur->req = NULL; |
87 | ||
45c5a914 SJ |
88 | mq->mqrq_prev->brq.mrq.data = NULL; |
89 | mq->mqrq_prev->req = NULL; | |
7551847c | 90 | swap(mq->mqrq_prev, mq->mqrq_cur); |
ee8a43a5 | 91 | } else { |
7b30d281 VW |
92 | if (kthread_should_stop()) { |
93 | set_current_state(TASK_RUNNING); | |
1da177e4 | 94 | break; |
7b30d281 | 95 | } |
1da177e4 LT |
96 | up(&mq->thread_sem); |
97 | schedule(); | |
98 | down(&mq->thread_sem); | |
1da177e4 | 99 | } |
1da177e4 | 100 | } while (1); |
1da177e4 LT |
101 | up(&mq->thread_sem); |
102 | ||
1da177e4 LT |
103 | return 0; |
104 | } | |
105 | ||
106 | /* | |
107 | * Generic MMC request handler. This is called for any queue on a | |
108 | * particular host. When the host is not busy, we look for a request | |
109 | * on any queue on this host, and attempt to issue it. This may | |
110 | * not be the queue we were asked to process. | |
111 | */ | |
1b50f5f3 | 112 | static void mmc_request_fn(struct request_queue *q) |
1da177e4 LT |
113 | { |
114 | struct mmc_queue *mq = q->queuedata; | |
89b4e133 | 115 | struct request *req; |
2220eedf KD |
116 | unsigned long flags; |
117 | struct mmc_context_info *cntx; | |
89b4e133 PO |
118 | |
119 | if (!mq) { | |
5fa83ce2 AH |
120 | while ((req = blk_fetch_request(q)) != NULL) { |
121 | req->cmd_flags |= REQ_QUIET; | |
296b2f6a | 122 | __blk_end_request_all(req, -EIO); |
5fa83ce2 | 123 | } |
89b4e133 PO |
124 | return; |
125 | } | |
1da177e4 | 126 | |
2220eedf KD |
127 | cntx = &mq->card->host->context_info; |
128 | if (!mq->mqrq_cur->req && mq->mqrq_prev->req) { | |
129 | /* | |
130 | * New MMC request arrived when MMC thread may be | |
131 | * blocked on the previous request to be complete | |
132 | * with no current request fetched | |
133 | */ | |
134 | spin_lock_irqsave(&cntx->lock, flags); | |
135 | if (cntx->is_waiting_last_req) { | |
136 | cntx->is_new_req = true; | |
137 | wake_up_interruptible(&cntx->wait); | |
138 | } | |
139 | spin_unlock_irqrestore(&cntx->lock, flags); | |
140 | } else if (!mq->mqrq_cur->req && !mq->mqrq_prev->req) | |
87598a2b | 141 | wake_up_process(mq->thread); |
1da177e4 LT |
142 | } |
143 | ||
7513cd7a | 144 | static struct scatterlist *mmc_alloc_sg(int sg_len, int *err) |
97868a2b PF |
145 | { |
146 | struct scatterlist *sg; | |
147 | ||
148 | sg = kmalloc(sizeof(struct scatterlist)*sg_len, GFP_KERNEL); | |
149 | if (!sg) | |
150 | *err = -ENOMEM; | |
151 | else { | |
152 | *err = 0; | |
153 | sg_init_table(sg, sg_len); | |
154 | } | |
155 | ||
156 | return sg; | |
157 | } | |
158 | ||
e056a1b5 AH |
159 | static void mmc_queue_setup_discard(struct request_queue *q, |
160 | struct mmc_card *card) | |
161 | { | |
162 | unsigned max_discard; | |
163 | ||
164 | max_discard = mmc_calc_max_discard(card); | |
165 | if (!max_discard) | |
166 | return; | |
167 | ||
168 | queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q); | |
2bb4cd5c | 169 | blk_queue_max_discard_sectors(q, max_discard); |
7194efb8 | 170 | if (card->erased_byte == 0 && !mmc_can_discard(card)) |
e056a1b5 AH |
171 | q->limits.discard_zeroes_data = 1; |
172 | q->limits.discard_granularity = card->pref_erase << 9; | |
173 | /* granularity must not be greater than max. discard */ | |
174 | if (card->pref_erase > max_discard) | |
175 | q->limits.discard_granularity = 0; | |
775a9362 | 176 | if (mmc_can_secure_erase_trim(card)) |
288dab8a | 177 | queue_flag_set_unlocked(QUEUE_FLAG_SECERASE, q); |
e056a1b5 AH |
178 | } |
179 | ||
1da177e4 LT |
180 | /** |
181 | * mmc_init_queue - initialise a queue structure. | |
182 | * @mq: mmc queue | |
183 | * @card: mmc card to attach this queue | |
184 | * @lock: queue lock | |
d09408ad | 185 | * @subname: partition subname |
1da177e4 LT |
186 | * |
187 | * Initialise a MMC card request queue. | |
188 | */ | |
d09408ad AH |
189 | int mmc_init_queue(struct mmc_queue *mq, struct mmc_card *card, |
190 | spinlock_t *lock, const char *subname) | |
1da177e4 LT |
191 | { |
192 | struct mmc_host *host = card->host; | |
193 | u64 limit = BLK_BOUNCE_HIGH; | |
194 | int ret; | |
97868a2b | 195 | struct mmc_queue_req *mqrq_cur = &mq->mqrq[0]; |
04296b7b | 196 | struct mmc_queue_req *mqrq_prev = &mq->mqrq[1]; |
1da177e4 | 197 | |
fcaf71fd | 198 | if (mmc_dev(host)->dma_mask && *mmc_dev(host)->dma_mask) |
e83b3664 | 199 | limit = (u64)dma_max_pfn(mmc_dev(host)) << PAGE_SHIFT; |
1da177e4 LT |
200 | |
201 | mq->card = card; | |
1b50f5f3 | 202 | mq->queue = blk_init_queue(mmc_request_fn, lock); |
1da177e4 LT |
203 | if (!mq->queue) |
204 | return -ENOMEM; | |
205 | ||
97868a2b | 206 | mq->mqrq_cur = mqrq_cur; |
04296b7b | 207 | mq->mqrq_prev = mqrq_prev; |
1da177e4 | 208 | mq->queue->queuedata = mq; |
1da177e4 | 209 | |
98ccf149 | 210 | blk_queue_prep_rq(mq->queue, mmc_prep_request); |
8dddfe19 | 211 | queue_flag_set_unlocked(QUEUE_FLAG_NONROT, mq->queue); |
b277da0a | 212 | queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, mq->queue); |
e056a1b5 AH |
213 | if (mmc_can_erase(card)) |
214 | mmc_queue_setup_discard(mq->queue, card); | |
98ccf149 PO |
215 | |
216 | #ifdef CONFIG_MMC_BLOCK_BOUNCE | |
a36274e0 | 217 | if (host->max_segs == 1) { |
aafabfab PO |
218 | unsigned int bouncesz; |
219 | ||
98ccf149 PO |
220 | bouncesz = MMC_QUEUE_BOUNCESZ; |
221 | ||
222 | if (bouncesz > host->max_req_size) | |
223 | bouncesz = host->max_req_size; | |
224 | if (bouncesz > host->max_seg_size) | |
225 | bouncesz = host->max_seg_size; | |
f3eb0aaa PO |
226 | if (bouncesz > (host->max_blk_count * 512)) |
227 | bouncesz = host->max_blk_count * 512; | |
228 | ||
229 | if (bouncesz > 512) { | |
97868a2b PF |
230 | mqrq_cur->bounce_buf = kmalloc(bouncesz, GFP_KERNEL); |
231 | if (!mqrq_cur->bounce_buf) { | |
6606110d | 232 | pr_warn("%s: unable to allocate bounce cur buffer\n", |
f3eb0aaa | 233 | mmc_card_name(card)); |
fdb409f6 BS |
234 | } else { |
235 | mqrq_prev->bounce_buf = | |
236 | kmalloc(bouncesz, GFP_KERNEL); | |
237 | if (!mqrq_prev->bounce_buf) { | |
238 | pr_warn("%s: unable to allocate bounce prev buffer\n", | |
239 | mmc_card_name(card)); | |
240 | kfree(mqrq_cur->bounce_buf); | |
241 | mqrq_cur->bounce_buf = NULL; | |
242 | } | |
04296b7b | 243 | } |
f3eb0aaa | 244 | } |
98ccf149 | 245 | |
04296b7b | 246 | if (mqrq_cur->bounce_buf && mqrq_prev->bounce_buf) { |
2ff1fa67 | 247 | blk_queue_bounce_limit(mq->queue, BLK_BOUNCE_ANY); |
086fa5ff | 248 | blk_queue_max_hw_sectors(mq->queue, bouncesz / 512); |
8a78362c | 249 | blk_queue_max_segments(mq->queue, bouncesz / 512); |
98ccf149 PO |
250 | blk_queue_max_segment_size(mq->queue, bouncesz); |
251 | ||
97868a2b PF |
252 | mqrq_cur->sg = mmc_alloc_sg(1, &ret); |
253 | if (ret) | |
aafabfab | 254 | goto cleanup_queue; |
98ccf149 | 255 | |
97868a2b PF |
256 | mqrq_cur->bounce_sg = |
257 | mmc_alloc_sg(bouncesz / 512, &ret); | |
258 | if (ret) | |
aafabfab | 259 | goto cleanup_queue; |
97868a2b | 260 | |
04296b7b PF |
261 | mqrq_prev->sg = mmc_alloc_sg(1, &ret); |
262 | if (ret) | |
263 | goto cleanup_queue; | |
264 | ||
265 | mqrq_prev->bounce_sg = | |
266 | mmc_alloc_sg(bouncesz / 512, &ret); | |
267 | if (ret) | |
268 | goto cleanup_queue; | |
98ccf149 PO |
269 | } |
270 | } | |
271 | #endif | |
272 | ||
04296b7b | 273 | if (!mqrq_cur->bounce_buf && !mqrq_prev->bounce_buf) { |
98ccf149 | 274 | blk_queue_bounce_limit(mq->queue, limit); |
086fa5ff | 275 | blk_queue_max_hw_sectors(mq->queue, |
f3eb0aaa | 276 | min(host->max_blk_count, host->max_req_size / 512)); |
a36274e0 | 277 | blk_queue_max_segments(mq->queue, host->max_segs); |
98ccf149 PO |
278 | blk_queue_max_segment_size(mq->queue, host->max_seg_size); |
279 | ||
97868a2b PF |
280 | mqrq_cur->sg = mmc_alloc_sg(host->max_segs, &ret); |
281 | if (ret) | |
98ccf149 | 282 | goto cleanup_queue; |
97868a2b | 283 | |
04296b7b PF |
284 | |
285 | mqrq_prev->sg = mmc_alloc_sg(host->max_segs, &ret); | |
286 | if (ret) | |
287 | goto cleanup_queue; | |
1da177e4 LT |
288 | } |
289 | ||
632cf92a | 290 | sema_init(&mq->thread_sem, 1); |
1da177e4 | 291 | |
d09408ad AH |
292 | mq->thread = kthread_run(mmc_queue_thread, mq, "mmcqd/%d%s", |
293 | host->index, subname ? subname : ""); | |
de528fa3 | 294 | |
87598a2b CH |
295 | if (IS_ERR(mq->thread)) { |
296 | ret = PTR_ERR(mq->thread); | |
98ccf149 | 297 | goto free_bounce_sg; |
1da177e4 LT |
298 | } |
299 | ||
87598a2b | 300 | return 0; |
98ccf149 | 301 | free_bounce_sg: |
97868a2b PF |
302 | kfree(mqrq_cur->bounce_sg); |
303 | mqrq_cur->bounce_sg = NULL; | |
04296b7b PF |
304 | kfree(mqrq_prev->bounce_sg); |
305 | mqrq_prev->bounce_sg = NULL; | |
97868a2b | 306 | |
aafabfab | 307 | cleanup_queue: |
97868a2b PF |
308 | kfree(mqrq_cur->sg); |
309 | mqrq_cur->sg = NULL; | |
310 | kfree(mqrq_cur->bounce_buf); | |
311 | mqrq_cur->bounce_buf = NULL; | |
312 | ||
04296b7b PF |
313 | kfree(mqrq_prev->sg); |
314 | mqrq_prev->sg = NULL; | |
315 | kfree(mqrq_prev->bounce_buf); | |
316 | mqrq_prev->bounce_buf = NULL; | |
317 | ||
1da177e4 | 318 | blk_cleanup_queue(mq->queue); |
1da177e4 LT |
319 | return ret; |
320 | } | |
1da177e4 LT |
321 | |
322 | void mmc_cleanup_queue(struct mmc_queue *mq) | |
323 | { | |
165125e1 | 324 | struct request_queue *q = mq->queue; |
89b4e133 | 325 | unsigned long flags; |
97868a2b | 326 | struct mmc_queue_req *mqrq_cur = mq->mqrq_cur; |
04296b7b | 327 | struct mmc_queue_req *mqrq_prev = mq->mqrq_prev; |
89b4e133 | 328 | |
d2b46f66 PO |
329 | /* Make sure the queue isn't suspended, as that will deadlock */ |
330 | mmc_queue_resume(mq); | |
331 | ||
89b4e133 | 332 | /* Then terminate our worker thread */ |
87598a2b | 333 | kthread_stop(mq->thread); |
1da177e4 | 334 | |
5fa83ce2 AH |
335 | /* Empty the queue */ |
336 | spin_lock_irqsave(q->queue_lock, flags); | |
337 | q->queuedata = NULL; | |
338 | blk_start_queue(q); | |
339 | spin_unlock_irqrestore(q->queue_lock, flags); | |
340 | ||
97868a2b PF |
341 | kfree(mqrq_cur->bounce_sg); |
342 | mqrq_cur->bounce_sg = NULL; | |
98ccf149 | 343 | |
97868a2b PF |
344 | kfree(mqrq_cur->sg); |
345 | mqrq_cur->sg = NULL; | |
1da177e4 | 346 | |
97868a2b PF |
347 | kfree(mqrq_cur->bounce_buf); |
348 | mqrq_cur->bounce_buf = NULL; | |
98ccf149 | 349 | |
04296b7b PF |
350 | kfree(mqrq_prev->bounce_sg); |
351 | mqrq_prev->bounce_sg = NULL; | |
352 | ||
353 | kfree(mqrq_prev->sg); | |
354 | mqrq_prev->sg = NULL; | |
355 | ||
356 | kfree(mqrq_prev->bounce_buf); | |
357 | mqrq_prev->bounce_buf = NULL; | |
358 | ||
1da177e4 LT |
359 | mq->card = NULL; |
360 | } | |
361 | EXPORT_SYMBOL(mmc_cleanup_queue); | |
362 | ||
ce39f9d1 SJ |
363 | int mmc_packed_init(struct mmc_queue *mq, struct mmc_card *card) |
364 | { | |
365 | struct mmc_queue_req *mqrq_cur = &mq->mqrq[0]; | |
366 | struct mmc_queue_req *mqrq_prev = &mq->mqrq[1]; | |
367 | int ret = 0; | |
368 | ||
369 | ||
370 | mqrq_cur->packed = kzalloc(sizeof(struct mmc_packed), GFP_KERNEL); | |
371 | if (!mqrq_cur->packed) { | |
372 | pr_warn("%s: unable to allocate packed cmd for mqrq_cur\n", | |
373 | mmc_card_name(card)); | |
374 | ret = -ENOMEM; | |
375 | goto out; | |
376 | } | |
377 | ||
378 | mqrq_prev->packed = kzalloc(sizeof(struct mmc_packed), GFP_KERNEL); | |
379 | if (!mqrq_prev->packed) { | |
380 | pr_warn("%s: unable to allocate packed cmd for mqrq_prev\n", | |
381 | mmc_card_name(card)); | |
382 | kfree(mqrq_cur->packed); | |
383 | mqrq_cur->packed = NULL; | |
384 | ret = -ENOMEM; | |
385 | goto out; | |
386 | } | |
387 | ||
388 | INIT_LIST_HEAD(&mqrq_cur->packed->list); | |
389 | INIT_LIST_HEAD(&mqrq_prev->packed->list); | |
390 | ||
391 | out: | |
392 | return ret; | |
393 | } | |
394 | ||
395 | void mmc_packed_clean(struct mmc_queue *mq) | |
396 | { | |
397 | struct mmc_queue_req *mqrq_cur = &mq->mqrq[0]; | |
398 | struct mmc_queue_req *mqrq_prev = &mq->mqrq[1]; | |
399 | ||
400 | kfree(mqrq_cur->packed); | |
401 | mqrq_cur->packed = NULL; | |
402 | kfree(mqrq_prev->packed); | |
403 | mqrq_prev->packed = NULL; | |
404 | } | |
405 | ||
1da177e4 LT |
406 | /** |
407 | * mmc_queue_suspend - suspend a MMC request queue | |
408 | * @mq: MMC queue to suspend | |
409 | * | |
410 | * Stop the block request queue, and wait for our thread to | |
411 | * complete any outstanding requests. This ensures that we | |
412 | * won't suspend while a request is being processed. | |
413 | */ | |
414 | void mmc_queue_suspend(struct mmc_queue *mq) | |
415 | { | |
165125e1 | 416 | struct request_queue *q = mq->queue; |
1da177e4 LT |
417 | unsigned long flags; |
418 | ||
419 | if (!(mq->flags & MMC_QUEUE_SUSPENDED)) { | |
420 | mq->flags |= MMC_QUEUE_SUSPENDED; | |
421 | ||
422 | spin_lock_irqsave(q->queue_lock, flags); | |
423 | blk_stop_queue(q); | |
424 | spin_unlock_irqrestore(q->queue_lock, flags); | |
425 | ||
426 | down(&mq->thread_sem); | |
427 | } | |
428 | } | |
1da177e4 LT |
429 | |
430 | /** | |
431 | * mmc_queue_resume - resume a previously suspended MMC request queue | |
432 | * @mq: MMC queue to resume | |
433 | */ | |
434 | void mmc_queue_resume(struct mmc_queue *mq) | |
435 | { | |
165125e1 | 436 | struct request_queue *q = mq->queue; |
1da177e4 LT |
437 | unsigned long flags; |
438 | ||
439 | if (mq->flags & MMC_QUEUE_SUSPENDED) { | |
440 | mq->flags &= ~MMC_QUEUE_SUSPENDED; | |
441 | ||
442 | up(&mq->thread_sem); | |
443 | ||
444 | spin_lock_irqsave(q->queue_lock, flags); | |
445 | blk_start_queue(q); | |
446 | spin_unlock_irqrestore(q->queue_lock, flags); | |
447 | } | |
448 | } | |
98ac2162 | 449 | |
ce39f9d1 SJ |
450 | static unsigned int mmc_queue_packed_map_sg(struct mmc_queue *mq, |
451 | struct mmc_packed *packed, | |
452 | struct scatterlist *sg, | |
453 | enum mmc_packed_type cmd_type) | |
454 | { | |
455 | struct scatterlist *__sg = sg; | |
456 | unsigned int sg_len = 0; | |
457 | struct request *req; | |
458 | ||
459 | if (mmc_packed_wr(cmd_type)) { | |
460 | unsigned int hdr_sz = mmc_large_sector(mq->card) ? 4096 : 512; | |
461 | unsigned int max_seg_sz = queue_max_segment_size(mq->queue); | |
462 | unsigned int len, remain, offset = 0; | |
463 | u8 *buf = (u8 *)packed->cmd_hdr; | |
464 | ||
465 | remain = hdr_sz; | |
466 | do { | |
467 | len = min(remain, max_seg_sz); | |
468 | sg_set_buf(__sg, buf + offset, len); | |
469 | offset += len; | |
470 | remain -= len; | |
da81ed16 | 471 | sg_unmark_end(__sg++); |
ce39f9d1 SJ |
472 | sg_len++; |
473 | } while (remain); | |
474 | } | |
475 | ||
476 | list_for_each_entry(req, &packed->list, queuelist) { | |
477 | sg_len += blk_rq_map_sg(mq->queue, req, __sg); | |
478 | __sg = sg + (sg_len - 1); | |
da81ed16 | 479 | sg_unmark_end(__sg++); |
ce39f9d1 SJ |
480 | } |
481 | sg_mark_end(sg + (sg_len - 1)); | |
482 | return sg_len; | |
483 | } | |
484 | ||
2ff1fa67 PO |
485 | /* |
486 | * Prepare the sg list(s) to be handed of to the host driver | |
487 | */ | |
97868a2b | 488 | unsigned int mmc_queue_map_sg(struct mmc_queue *mq, struct mmc_queue_req *mqrq) |
98ccf149 PO |
489 | { |
490 | unsigned int sg_len; | |
2ff1fa67 PO |
491 | size_t buflen; |
492 | struct scatterlist *sg; | |
ce39f9d1 | 493 | enum mmc_packed_type cmd_type; |
2ff1fa67 | 494 | int i; |
98ccf149 | 495 | |
ce39f9d1 SJ |
496 | cmd_type = mqrq->cmd_type; |
497 | ||
498 | if (!mqrq->bounce_buf) { | |
499 | if (mmc_packed_cmd(cmd_type)) | |
500 | return mmc_queue_packed_map_sg(mq, mqrq->packed, | |
501 | mqrq->sg, cmd_type); | |
502 | else | |
503 | return blk_rq_map_sg(mq->queue, mqrq->req, mqrq->sg); | |
504 | } | |
98ccf149 | 505 | |
97868a2b | 506 | BUG_ON(!mqrq->bounce_sg); |
98ccf149 | 507 | |
ce39f9d1 SJ |
508 | if (mmc_packed_cmd(cmd_type)) |
509 | sg_len = mmc_queue_packed_map_sg(mq, mqrq->packed, | |
510 | mqrq->bounce_sg, cmd_type); | |
511 | else | |
512 | sg_len = blk_rq_map_sg(mq->queue, mqrq->req, mqrq->bounce_sg); | |
98ccf149 | 513 | |
97868a2b | 514 | mqrq->bounce_sg_len = sg_len; |
98ccf149 | 515 | |
2ff1fa67 | 516 | buflen = 0; |
97868a2b | 517 | for_each_sg(mqrq->bounce_sg, sg, sg_len, i) |
2ff1fa67 | 518 | buflen += sg->length; |
98ccf149 | 519 | |
97868a2b | 520 | sg_init_one(mqrq->sg, mqrq->bounce_buf, buflen); |
98ccf149 PO |
521 | |
522 | return 1; | |
523 | } | |
524 | ||
2ff1fa67 PO |
525 | /* |
526 | * If writing, bounce the data to the buffer before the request | |
527 | * is sent to the host driver | |
528 | */ | |
97868a2b | 529 | void mmc_queue_bounce_pre(struct mmc_queue_req *mqrq) |
98ccf149 | 530 | { |
97868a2b | 531 | if (!mqrq->bounce_buf) |
98ccf149 PO |
532 | return; |
533 | ||
97868a2b | 534 | if (rq_data_dir(mqrq->req) != WRITE) |
98ccf149 PO |
535 | return; |
536 | ||
97868a2b PF |
537 | sg_copy_to_buffer(mqrq->bounce_sg, mqrq->bounce_sg_len, |
538 | mqrq->bounce_buf, mqrq->sg[0].length); | |
98ccf149 PO |
539 | } |
540 | ||
2ff1fa67 PO |
541 | /* |
542 | * If reading, bounce the data from the buffer after the request | |
543 | * has been handled by the host driver | |
544 | */ | |
97868a2b | 545 | void mmc_queue_bounce_post(struct mmc_queue_req *mqrq) |
98ccf149 | 546 | { |
97868a2b | 547 | if (!mqrq->bounce_buf) |
98ccf149 PO |
548 | return; |
549 | ||
97868a2b | 550 | if (rq_data_dir(mqrq->req) != READ) |
98ccf149 PO |
551 | return; |
552 | ||
97868a2b PF |
553 | sg_copy_from_buffer(mqrq->bounce_sg, mqrq->bounce_sg_len, |
554 | mqrq->bounce_buf, mqrq->sg[0].length); | |
98ccf149 | 555 | } |