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