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Commit | Line | Data |
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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 | ||
a8ad82cc SRT |
41 | if (mq && mmc_card_removed(mq->card)) |
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; | |
ee8a43a5 | 59 | struct mmc_queue_req *tmp; |
369d321e | 60 | unsigned int cmd_flags = 0; |
1da177e4 LT |
61 | |
62 | spin_lock_irq(q->queue_lock); | |
63 | set_current_state(TASK_INTERRUPTIBLE); | |
7eaceacc | 64 | req = blk_fetch_request(q); |
97868a2b | 65 | mq->mqrq_cur->req = req; |
1da177e4 LT |
66 | spin_unlock_irq(q->queue_lock); |
67 | ||
ee8a43a5 PF |
68 | if (req || mq->mqrq_prev->req) { |
69 | set_current_state(TASK_RUNNING); | |
369d321e | 70 | cmd_flags = req ? req->cmd_flags : 0; |
ee8a43a5 | 71 | mq->issue_fn(mq, req); |
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; | |
89 | tmp = mq->mqrq_prev; | |
90 | mq->mqrq_prev = mq->mqrq_cur; | |
91 | mq->mqrq_cur = tmp; | |
ee8a43a5 | 92 | } else { |
7b30d281 VW |
93 | if (kthread_should_stop()) { |
94 | set_current_state(TASK_RUNNING); | |
1da177e4 | 95 | break; |
7b30d281 | 96 | } |
1da177e4 LT |
97 | up(&mq->thread_sem); |
98 | schedule(); | |
99 | down(&mq->thread_sem); | |
1da177e4 | 100 | } |
1da177e4 | 101 | } while (1); |
1da177e4 LT |
102 | up(&mq->thread_sem); |
103 | ||
1da177e4 LT |
104 | return 0; |
105 | } | |
106 | ||
107 | /* | |
108 | * Generic MMC request handler. This is called for any queue on a | |
109 | * particular host. When the host is not busy, we look for a request | |
110 | * on any queue on this host, and attempt to issue it. This may | |
111 | * not be the queue we were asked to process. | |
112 | */ | |
1b50f5f3 | 113 | static void mmc_request_fn(struct request_queue *q) |
1da177e4 LT |
114 | { |
115 | struct mmc_queue *mq = q->queuedata; | |
89b4e133 | 116 | struct request *req; |
2220eedf KD |
117 | unsigned long flags; |
118 | struct mmc_context_info *cntx; | |
89b4e133 PO |
119 | |
120 | if (!mq) { | |
5fa83ce2 AH |
121 | while ((req = blk_fetch_request(q)) != NULL) { |
122 | req->cmd_flags |= REQ_QUIET; | |
296b2f6a | 123 | __blk_end_request_all(req, -EIO); |
5fa83ce2 | 124 | } |
89b4e133 PO |
125 | return; |
126 | } | |
1da177e4 | 127 | |
2220eedf KD |
128 | cntx = &mq->card->host->context_info; |
129 | if (!mq->mqrq_cur->req && mq->mqrq_prev->req) { | |
130 | /* | |
131 | * New MMC request arrived when MMC thread may be | |
132 | * blocked on the previous request to be complete | |
133 | * with no current request fetched | |
134 | */ | |
135 | spin_lock_irqsave(&cntx->lock, flags); | |
136 | if (cntx->is_waiting_last_req) { | |
137 | cntx->is_new_req = true; | |
138 | wake_up_interruptible(&cntx->wait); | |
139 | } | |
140 | spin_unlock_irqrestore(&cntx->lock, flags); | |
141 | } else if (!mq->mqrq_cur->req && !mq->mqrq_prev->req) | |
87598a2b | 142 | wake_up_process(mq->thread); |
1da177e4 LT |
143 | } |
144 | ||
7513cd7a | 145 | static struct scatterlist *mmc_alloc_sg(int sg_len, int *err) |
97868a2b PF |
146 | { |
147 | struct scatterlist *sg; | |
148 | ||
149 | sg = kmalloc(sizeof(struct scatterlist)*sg_len, GFP_KERNEL); | |
150 | if (!sg) | |
151 | *err = -ENOMEM; | |
152 | else { | |
153 | *err = 0; | |
154 | sg_init_table(sg, sg_len); | |
155 | } | |
156 | ||
157 | return sg; | |
158 | } | |
159 | ||
e056a1b5 AH |
160 | static void mmc_queue_setup_discard(struct request_queue *q, |
161 | struct mmc_card *card) | |
162 | { | |
163 | unsigned max_discard; | |
164 | ||
165 | max_discard = mmc_calc_max_discard(card); | |
166 | if (!max_discard) | |
167 | return; | |
168 | ||
169 | queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q); | |
170 | q->limits.max_discard_sectors = max_discard; | |
7194efb8 | 171 | if (card->erased_byte == 0 && !mmc_can_discard(card)) |
e056a1b5 AH |
172 | q->limits.discard_zeroes_data = 1; |
173 | q->limits.discard_granularity = card->pref_erase << 9; | |
174 | /* granularity must not be greater than max. discard */ | |
175 | if (card->pref_erase > max_discard) | |
176 | q->limits.discard_granularity = 0; | |
775a9362 | 177 | if (mmc_can_secure_erase_trim(card)) |
e056a1b5 AH |
178 | queue_flag_set_unlocked(QUEUE_FLAG_SECDISCARD, q); |
179 | } | |
180 | ||
1da177e4 LT |
181 | /** |
182 | * mmc_init_queue - initialise a queue structure. | |
183 | * @mq: mmc queue | |
184 | * @card: mmc card to attach this queue | |
185 | * @lock: queue lock | |
d09408ad | 186 | * @subname: partition subname |
1da177e4 LT |
187 | * |
188 | * Initialise a MMC card request queue. | |
189 | */ | |
d09408ad AH |
190 | int mmc_init_queue(struct mmc_queue *mq, struct mmc_card *card, |
191 | spinlock_t *lock, const char *subname) | |
1da177e4 LT |
192 | { |
193 | struct mmc_host *host = card->host; | |
194 | u64 limit = BLK_BOUNCE_HIGH; | |
195 | int ret; | |
97868a2b | 196 | struct mmc_queue_req *mqrq_cur = &mq->mqrq[0]; |
04296b7b | 197 | struct mmc_queue_req *mqrq_prev = &mq->mqrq[1]; |
1da177e4 | 198 | |
fcaf71fd | 199 | if (mmc_dev(host)->dma_mask && *mmc_dev(host)->dma_mask) |
e83b3664 | 200 | limit = (u64)dma_max_pfn(mmc_dev(host)) << PAGE_SHIFT; |
1da177e4 LT |
201 | |
202 | mq->card = card; | |
1b50f5f3 | 203 | mq->queue = blk_init_queue(mmc_request_fn, lock); |
1da177e4 LT |
204 | if (!mq->queue) |
205 | return -ENOMEM; | |
206 | ||
97868a2b | 207 | mq->mqrq_cur = mqrq_cur; |
04296b7b | 208 | mq->mqrq_prev = mqrq_prev; |
1da177e4 | 209 | mq->queue->queuedata = mq; |
1da177e4 | 210 | |
98ccf149 | 211 | blk_queue_prep_rq(mq->queue, mmc_prep_request); |
8dddfe19 | 212 | queue_flag_set_unlocked(QUEUE_FLAG_NONROT, mq->queue); |
b277da0a | 213 | queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, mq->queue); |
e056a1b5 AH |
214 | if (mmc_can_erase(card)) |
215 | mmc_queue_setup_discard(mq->queue, card); | |
98ccf149 PO |
216 | |
217 | #ifdef CONFIG_MMC_BLOCK_BOUNCE | |
a36274e0 | 218 | if (host->max_segs == 1) { |
aafabfab PO |
219 | unsigned int bouncesz; |
220 | ||
98ccf149 PO |
221 | bouncesz = MMC_QUEUE_BOUNCESZ; |
222 | ||
223 | if (bouncesz > host->max_req_size) | |
224 | bouncesz = host->max_req_size; | |
225 | if (bouncesz > host->max_seg_size) | |
226 | bouncesz = host->max_seg_size; | |
f3eb0aaa PO |
227 | if (bouncesz > (host->max_blk_count * 512)) |
228 | bouncesz = host->max_blk_count * 512; | |
229 | ||
230 | if (bouncesz > 512) { | |
97868a2b PF |
231 | mqrq_cur->bounce_buf = kmalloc(bouncesz, GFP_KERNEL); |
232 | if (!mqrq_cur->bounce_buf) { | |
6606110d | 233 | pr_warn("%s: unable to allocate bounce cur buffer\n", |
f3eb0aaa | 234 | mmc_card_name(card)); |
fdb409f6 BS |
235 | } else { |
236 | mqrq_prev->bounce_buf = | |
237 | kmalloc(bouncesz, GFP_KERNEL); | |
238 | if (!mqrq_prev->bounce_buf) { | |
239 | pr_warn("%s: unable to allocate bounce prev buffer\n", | |
240 | mmc_card_name(card)); | |
241 | kfree(mqrq_cur->bounce_buf); | |
242 | mqrq_cur->bounce_buf = NULL; | |
243 | } | |
04296b7b | 244 | } |
f3eb0aaa | 245 | } |
98ccf149 | 246 | |
04296b7b | 247 | if (mqrq_cur->bounce_buf && mqrq_prev->bounce_buf) { |
2ff1fa67 | 248 | blk_queue_bounce_limit(mq->queue, BLK_BOUNCE_ANY); |
086fa5ff | 249 | blk_queue_max_hw_sectors(mq->queue, bouncesz / 512); |
8a78362c | 250 | blk_queue_max_segments(mq->queue, bouncesz / 512); |
98ccf149 PO |
251 | blk_queue_max_segment_size(mq->queue, bouncesz); |
252 | ||
97868a2b PF |
253 | mqrq_cur->sg = mmc_alloc_sg(1, &ret); |
254 | if (ret) | |
aafabfab | 255 | goto cleanup_queue; |
98ccf149 | 256 | |
97868a2b PF |
257 | mqrq_cur->bounce_sg = |
258 | mmc_alloc_sg(bouncesz / 512, &ret); | |
259 | if (ret) | |
aafabfab | 260 | goto cleanup_queue; |
97868a2b | 261 | |
04296b7b PF |
262 | mqrq_prev->sg = mmc_alloc_sg(1, &ret); |
263 | if (ret) | |
264 | goto cleanup_queue; | |
265 | ||
266 | mqrq_prev->bounce_sg = | |
267 | mmc_alloc_sg(bouncesz / 512, &ret); | |
268 | if (ret) | |
269 | goto cleanup_queue; | |
98ccf149 PO |
270 | } |
271 | } | |
272 | #endif | |
273 | ||
04296b7b | 274 | if (!mqrq_cur->bounce_buf && !mqrq_prev->bounce_buf) { |
98ccf149 | 275 | blk_queue_bounce_limit(mq->queue, limit); |
086fa5ff | 276 | blk_queue_max_hw_sectors(mq->queue, |
f3eb0aaa | 277 | min(host->max_blk_count, host->max_req_size / 512)); |
a36274e0 | 278 | blk_queue_max_segments(mq->queue, host->max_segs); |
98ccf149 PO |
279 | blk_queue_max_segment_size(mq->queue, host->max_seg_size); |
280 | ||
97868a2b PF |
281 | mqrq_cur->sg = mmc_alloc_sg(host->max_segs, &ret); |
282 | if (ret) | |
98ccf149 | 283 | goto cleanup_queue; |
97868a2b | 284 | |
04296b7b PF |
285 | |
286 | mqrq_prev->sg = mmc_alloc_sg(host->max_segs, &ret); | |
287 | if (ret) | |
288 | goto cleanup_queue; | |
1da177e4 LT |
289 | } |
290 | ||
632cf92a | 291 | sema_init(&mq->thread_sem, 1); |
1da177e4 | 292 | |
d09408ad AH |
293 | mq->thread = kthread_run(mmc_queue_thread, mq, "mmcqd/%d%s", |
294 | host->index, subname ? subname : ""); | |
de528fa3 | 295 | |
87598a2b CH |
296 | if (IS_ERR(mq->thread)) { |
297 | ret = PTR_ERR(mq->thread); | |
98ccf149 | 298 | goto free_bounce_sg; |
1da177e4 LT |
299 | } |
300 | ||
87598a2b | 301 | return 0; |
98ccf149 | 302 | free_bounce_sg: |
97868a2b PF |
303 | kfree(mqrq_cur->bounce_sg); |
304 | mqrq_cur->bounce_sg = NULL; | |
04296b7b PF |
305 | kfree(mqrq_prev->bounce_sg); |
306 | mqrq_prev->bounce_sg = NULL; | |
97868a2b | 307 | |
aafabfab | 308 | cleanup_queue: |
97868a2b PF |
309 | kfree(mqrq_cur->sg); |
310 | mqrq_cur->sg = NULL; | |
311 | kfree(mqrq_cur->bounce_buf); | |
312 | mqrq_cur->bounce_buf = NULL; | |
313 | ||
04296b7b PF |
314 | kfree(mqrq_prev->sg); |
315 | mqrq_prev->sg = NULL; | |
316 | kfree(mqrq_prev->bounce_buf); | |
317 | mqrq_prev->bounce_buf = NULL; | |
318 | ||
1da177e4 | 319 | blk_cleanup_queue(mq->queue); |
1da177e4 LT |
320 | return ret; |
321 | } | |
1da177e4 LT |
322 | |
323 | void mmc_cleanup_queue(struct mmc_queue *mq) | |
324 | { | |
165125e1 | 325 | struct request_queue *q = mq->queue; |
89b4e133 | 326 | unsigned long flags; |
97868a2b | 327 | struct mmc_queue_req *mqrq_cur = mq->mqrq_cur; |
04296b7b | 328 | struct mmc_queue_req *mqrq_prev = mq->mqrq_prev; |
89b4e133 | 329 | |
d2b46f66 PO |
330 | /* Make sure the queue isn't suspended, as that will deadlock */ |
331 | mmc_queue_resume(mq); | |
332 | ||
89b4e133 | 333 | /* Then terminate our worker thread */ |
87598a2b | 334 | kthread_stop(mq->thread); |
1da177e4 | 335 | |
5fa83ce2 AH |
336 | /* Empty the queue */ |
337 | spin_lock_irqsave(q->queue_lock, flags); | |
338 | q->queuedata = NULL; | |
339 | blk_start_queue(q); | |
340 | spin_unlock_irqrestore(q->queue_lock, flags); | |
341 | ||
97868a2b PF |
342 | kfree(mqrq_cur->bounce_sg); |
343 | mqrq_cur->bounce_sg = NULL; | |
98ccf149 | 344 | |
97868a2b PF |
345 | kfree(mqrq_cur->sg); |
346 | mqrq_cur->sg = NULL; | |
1da177e4 | 347 | |
97868a2b PF |
348 | kfree(mqrq_cur->bounce_buf); |
349 | mqrq_cur->bounce_buf = NULL; | |
98ccf149 | 350 | |
04296b7b PF |
351 | kfree(mqrq_prev->bounce_sg); |
352 | mqrq_prev->bounce_sg = NULL; | |
353 | ||
354 | kfree(mqrq_prev->sg); | |
355 | mqrq_prev->sg = NULL; | |
356 | ||
357 | kfree(mqrq_prev->bounce_buf); | |
358 | mqrq_prev->bounce_buf = NULL; | |
359 | ||
1da177e4 LT |
360 | mq->card = NULL; |
361 | } | |
362 | EXPORT_SYMBOL(mmc_cleanup_queue); | |
363 | ||
ce39f9d1 SJ |
364 | int mmc_packed_init(struct mmc_queue *mq, struct mmc_card *card) |
365 | { | |
366 | struct mmc_queue_req *mqrq_cur = &mq->mqrq[0]; | |
367 | struct mmc_queue_req *mqrq_prev = &mq->mqrq[1]; | |
368 | int ret = 0; | |
369 | ||
370 | ||
371 | mqrq_cur->packed = kzalloc(sizeof(struct mmc_packed), GFP_KERNEL); | |
372 | if (!mqrq_cur->packed) { | |
373 | pr_warn("%s: unable to allocate packed cmd for mqrq_cur\n", | |
374 | mmc_card_name(card)); | |
375 | ret = -ENOMEM; | |
376 | goto out; | |
377 | } | |
378 | ||
379 | mqrq_prev->packed = kzalloc(sizeof(struct mmc_packed), GFP_KERNEL); | |
380 | if (!mqrq_prev->packed) { | |
381 | pr_warn("%s: unable to allocate packed cmd for mqrq_prev\n", | |
382 | mmc_card_name(card)); | |
383 | kfree(mqrq_cur->packed); | |
384 | mqrq_cur->packed = NULL; | |
385 | ret = -ENOMEM; | |
386 | goto out; | |
387 | } | |
388 | ||
389 | INIT_LIST_HEAD(&mqrq_cur->packed->list); | |
390 | INIT_LIST_HEAD(&mqrq_prev->packed->list); | |
391 | ||
392 | out: | |
393 | return ret; | |
394 | } | |
395 | ||
396 | void mmc_packed_clean(struct mmc_queue *mq) | |
397 | { | |
398 | struct mmc_queue_req *mqrq_cur = &mq->mqrq[0]; | |
399 | struct mmc_queue_req *mqrq_prev = &mq->mqrq[1]; | |
400 | ||
401 | kfree(mqrq_cur->packed); | |
402 | mqrq_cur->packed = NULL; | |
403 | kfree(mqrq_prev->packed); | |
404 | mqrq_prev->packed = NULL; | |
405 | } | |
406 | ||
1da177e4 LT |
407 | /** |
408 | * mmc_queue_suspend - suspend a MMC request queue | |
409 | * @mq: MMC queue to suspend | |
410 | * | |
411 | * Stop the block request queue, and wait for our thread to | |
412 | * complete any outstanding requests. This ensures that we | |
413 | * won't suspend while a request is being processed. | |
414 | */ | |
415 | void mmc_queue_suspend(struct mmc_queue *mq) | |
416 | { | |
165125e1 | 417 | struct request_queue *q = mq->queue; |
1da177e4 LT |
418 | unsigned long flags; |
419 | ||
420 | if (!(mq->flags & MMC_QUEUE_SUSPENDED)) { | |
421 | mq->flags |= MMC_QUEUE_SUSPENDED; | |
422 | ||
423 | spin_lock_irqsave(q->queue_lock, flags); | |
424 | blk_stop_queue(q); | |
425 | spin_unlock_irqrestore(q->queue_lock, flags); | |
426 | ||
427 | down(&mq->thread_sem); | |
428 | } | |
429 | } | |
1da177e4 LT |
430 | |
431 | /** | |
432 | * mmc_queue_resume - resume a previously suspended MMC request queue | |
433 | * @mq: MMC queue to resume | |
434 | */ | |
435 | void mmc_queue_resume(struct mmc_queue *mq) | |
436 | { | |
165125e1 | 437 | struct request_queue *q = mq->queue; |
1da177e4 LT |
438 | unsigned long flags; |
439 | ||
440 | if (mq->flags & MMC_QUEUE_SUSPENDED) { | |
441 | mq->flags &= ~MMC_QUEUE_SUSPENDED; | |
442 | ||
443 | up(&mq->thread_sem); | |
444 | ||
445 | spin_lock_irqsave(q->queue_lock, flags); | |
446 | blk_start_queue(q); | |
447 | spin_unlock_irqrestore(q->queue_lock, flags); | |
448 | } | |
449 | } | |
98ac2162 | 450 | |
ce39f9d1 SJ |
451 | static unsigned int mmc_queue_packed_map_sg(struct mmc_queue *mq, |
452 | struct mmc_packed *packed, | |
453 | struct scatterlist *sg, | |
454 | enum mmc_packed_type cmd_type) | |
455 | { | |
456 | struct scatterlist *__sg = sg; | |
457 | unsigned int sg_len = 0; | |
458 | struct request *req; | |
459 | ||
460 | if (mmc_packed_wr(cmd_type)) { | |
461 | unsigned int hdr_sz = mmc_large_sector(mq->card) ? 4096 : 512; | |
462 | unsigned int max_seg_sz = queue_max_segment_size(mq->queue); | |
463 | unsigned int len, remain, offset = 0; | |
464 | u8 *buf = (u8 *)packed->cmd_hdr; | |
465 | ||
466 | remain = hdr_sz; | |
467 | do { | |
468 | len = min(remain, max_seg_sz); | |
469 | sg_set_buf(__sg, buf + offset, len); | |
470 | offset += len; | |
471 | remain -= len; | |
472 | (__sg++)->page_link &= ~0x02; | |
473 | sg_len++; | |
474 | } while (remain); | |
475 | } | |
476 | ||
477 | list_for_each_entry(req, &packed->list, queuelist) { | |
478 | sg_len += blk_rq_map_sg(mq->queue, req, __sg); | |
479 | __sg = sg + (sg_len - 1); | |
480 | (__sg++)->page_link &= ~0x02; | |
481 | } | |
482 | sg_mark_end(sg + (sg_len - 1)); | |
483 | return sg_len; | |
484 | } | |
485 | ||
2ff1fa67 PO |
486 | /* |
487 | * Prepare the sg list(s) to be handed of to the host driver | |
488 | */ | |
97868a2b | 489 | unsigned int mmc_queue_map_sg(struct mmc_queue *mq, struct mmc_queue_req *mqrq) |
98ccf149 PO |
490 | { |
491 | unsigned int sg_len; | |
2ff1fa67 PO |
492 | size_t buflen; |
493 | struct scatterlist *sg; | |
ce39f9d1 | 494 | enum mmc_packed_type cmd_type; |
2ff1fa67 | 495 | int i; |
98ccf149 | 496 | |
ce39f9d1 SJ |
497 | cmd_type = mqrq->cmd_type; |
498 | ||
499 | if (!mqrq->bounce_buf) { | |
500 | if (mmc_packed_cmd(cmd_type)) | |
501 | return mmc_queue_packed_map_sg(mq, mqrq->packed, | |
502 | mqrq->sg, cmd_type); | |
503 | else | |
504 | return blk_rq_map_sg(mq->queue, mqrq->req, mqrq->sg); | |
505 | } | |
98ccf149 | 506 | |
97868a2b | 507 | BUG_ON(!mqrq->bounce_sg); |
98ccf149 | 508 | |
ce39f9d1 SJ |
509 | if (mmc_packed_cmd(cmd_type)) |
510 | sg_len = mmc_queue_packed_map_sg(mq, mqrq->packed, | |
511 | mqrq->bounce_sg, cmd_type); | |
512 | else | |
513 | sg_len = blk_rq_map_sg(mq->queue, mqrq->req, mqrq->bounce_sg); | |
98ccf149 | 514 | |
97868a2b | 515 | mqrq->bounce_sg_len = sg_len; |
98ccf149 | 516 | |
2ff1fa67 | 517 | buflen = 0; |
97868a2b | 518 | for_each_sg(mqrq->bounce_sg, sg, sg_len, i) |
2ff1fa67 | 519 | buflen += sg->length; |
98ccf149 | 520 | |
97868a2b | 521 | sg_init_one(mqrq->sg, mqrq->bounce_buf, buflen); |
98ccf149 PO |
522 | |
523 | return 1; | |
524 | } | |
525 | ||
2ff1fa67 PO |
526 | /* |
527 | * If writing, bounce the data to the buffer before the request | |
528 | * is sent to the host driver | |
529 | */ | |
97868a2b | 530 | void mmc_queue_bounce_pre(struct mmc_queue_req *mqrq) |
98ccf149 | 531 | { |
97868a2b | 532 | if (!mqrq->bounce_buf) |
98ccf149 PO |
533 | return; |
534 | ||
97868a2b | 535 | if (rq_data_dir(mqrq->req) != WRITE) |
98ccf149 PO |
536 | return; |
537 | ||
97868a2b PF |
538 | sg_copy_to_buffer(mqrq->bounce_sg, mqrq->bounce_sg_len, |
539 | mqrq->bounce_buf, mqrq->sg[0].length); | |
98ccf149 PO |
540 | } |
541 | ||
2ff1fa67 PO |
542 | /* |
543 | * If reading, bounce the data from the buffer after the request | |
544 | * has been handled by the host driver | |
545 | */ | |
97868a2b | 546 | void mmc_queue_bounce_post(struct mmc_queue_req *mqrq) |
98ccf149 | 547 | { |
97868a2b | 548 | if (!mqrq->bounce_buf) |
98ccf149 PO |
549 | return; |
550 | ||
97868a2b | 551 | if (rq_data_dir(mqrq->req) != READ) |
98ccf149 PO |
552 | return; |
553 | ||
97868a2b PF |
554 | sg_copy_from_buffer(mqrq->bounce_sg, mqrq->bounce_sg_len, |
555 | mqrq->bounce_buf, mqrq->sg[0].length); | |
98ccf149 | 556 | } |