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1/*
2 * linux/drivers/mmc/card/queue.c
3 *
4 * Copyright (C) 2003 Russell King, All Rights Reserved.
5 * Copyright 2006-2007 Pierre Ossman
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 */
12#include <linux/slab.h>
13#include <linux/module.h>
14#include <linux/blkdev.h>
15#include <linux/freezer.h>
16#include <linux/kthread.h>
17#include <linux/scatterlist.h>
18
19#include <linux/mmc/card.h>
20#include <linux/mmc/host.h>
21#include "queue.h"
22
23#define MMC_QUEUE_BOUNCESZ 65536
24
25#define MMC_QUEUE_SUSPENDED (1 << 0)
26
27/*
28 * Prepare a MMC request. This just filters out odd stuff.
29 */
30static int mmc_prep_request(struct request_queue *q, struct request *req)
31{
32 struct mmc_queue *mq = q->queuedata;
33
34 /*
35 * We only like normal block requests and discards.
36 */
37 if (req->cmd_type != REQ_TYPE_FS && !(req->cmd_flags & REQ_DISCARD)) {
38 blk_dump_rq_flags(req, "MMC bad request");
39 return BLKPREP_KILL;
40 }
41
42 if (mq && mmc_card_removed(mq->card))
43 return BLKPREP_KILL;
44
45 req->cmd_flags |= REQ_DONTPREP;
46
47 return BLKPREP_OK;
48}
49
50static int mmc_queue_thread(void *d)
51{
52 struct mmc_queue *mq = d;
53 struct request_queue *q = mq->queue;
54
55 current->flags |= PF_MEMALLOC;
56
57 down(&mq->thread_sem);
58 do {
59 struct request *req = NULL;
60 struct mmc_queue_req *tmp;
61
62 spin_lock_irq(q->queue_lock);
63 set_current_state(TASK_INTERRUPTIBLE);
64 req = blk_fetch_request(q);
65 mq->mqrq_cur->req = req;
66 spin_unlock_irq(q->queue_lock);
67
68 if (req || mq->mqrq_prev->req) {
69 set_current_state(TASK_RUNNING);
70 mq->issue_fn(mq, req);
71 } else {
72 if (kthread_should_stop()) {
73 set_current_state(TASK_RUNNING);
74 break;
75 }
76 up(&mq->thread_sem);
77 schedule();
78 down(&mq->thread_sem);
79 }
80
81 /* Current request becomes previous request and vice versa. */
82 mq->mqrq_prev->brq.mrq.data = NULL;
83 mq->mqrq_prev->req = NULL;
84 tmp = mq->mqrq_prev;
85 mq->mqrq_prev = mq->mqrq_cur;
86 mq->mqrq_cur = tmp;
87 } while (1);
88 up(&mq->thread_sem);
89
90 return 0;
91}
92
93/*
94 * Generic MMC request handler. This is called for any queue on a
95 * particular host. When the host is not busy, we look for a request
96 * on any queue on this host, and attempt to issue it. This may
97 * not be the queue we were asked to process.
98 */
99static void mmc_request_fn(struct request_queue *q)
100{
101 struct mmc_queue *mq = q->queuedata;
102 struct request *req;
103
104 if (!mq) {
105 while ((req = blk_fetch_request(q)) != NULL) {
106 req->cmd_flags |= REQ_QUIET;
107 __blk_end_request_all(req, -EIO);
108 }
109 return;
110 }
111
112 if (!mq->mqrq_cur->req && !mq->mqrq_prev->req)
113 wake_up_process(mq->thread);
114}
115
116static struct scatterlist *mmc_alloc_sg(int sg_len, int *err)
117{
118 struct scatterlist *sg;
119
120 sg = kmalloc(sizeof(struct scatterlist)*sg_len, GFP_KERNEL);
121 if (!sg)
122 *err = -ENOMEM;
123 else {
124 *err = 0;
125 sg_init_table(sg, sg_len);
126 }
127
128 return sg;
129}
130
131static void mmc_queue_setup_discard(struct request_queue *q,
132 struct mmc_card *card)
133{
134 unsigned max_discard;
135
136 max_discard = mmc_calc_max_discard(card);
137 if (!max_discard)
138 return;
139
140 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
141 q->limits.max_discard_sectors = max_discard;
142 if (card->erased_byte == 0 && !mmc_can_discard(card))
143 q->limits.discard_zeroes_data = 1;
144 q->limits.discard_granularity = card->pref_erase << 9;
145 /* granularity must not be greater than max. discard */
146 if (card->pref_erase > max_discard)
147 q->limits.discard_granularity = 0;
148 if (mmc_can_secure_erase_trim(card) || mmc_can_sanitize(card))
149 queue_flag_set_unlocked(QUEUE_FLAG_SECDISCARD, q);
150}
151
152/**
153 * mmc_init_queue - initialise a queue structure.
154 * @mq: mmc queue
155 * @card: mmc card to attach this queue
156 * @lock: queue lock
157 * @subname: partition subname
158 *
159 * Initialise a MMC card request queue.
160 */
161int mmc_init_queue(struct mmc_queue *mq, struct mmc_card *card,
162 spinlock_t *lock, const char *subname)
163{
164 struct mmc_host *host = card->host;
165 u64 limit = BLK_BOUNCE_HIGH;
166 int ret;
167 struct mmc_queue_req *mqrq_cur = &mq->mqrq[0];
168 struct mmc_queue_req *mqrq_prev = &mq->mqrq[1];
169
170 if (mmc_dev(host)->dma_mask && *mmc_dev(host)->dma_mask)
171 limit = *mmc_dev(host)->dma_mask;
172
173 mq->card = card;
174 mq->queue = blk_init_queue(mmc_request_fn, lock);
175 if (!mq->queue)
176 return -ENOMEM;
177
178 mq->mqrq_cur = mqrq_cur;
179 mq->mqrq_prev = mqrq_prev;
180 mq->queue->queuedata = mq;
181
182 blk_queue_prep_rq(mq->queue, mmc_prep_request);
183 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, mq->queue);
184 if (mmc_can_erase(card))
185 mmc_queue_setup_discard(mq->queue, card);
186
187#ifdef CONFIG_MMC_BLOCK_BOUNCE
188 if (host->max_segs == 1) {
189 unsigned int bouncesz;
190
191 bouncesz = MMC_QUEUE_BOUNCESZ;
192
193 if (bouncesz > host->max_req_size)
194 bouncesz = host->max_req_size;
195 if (bouncesz > host->max_seg_size)
196 bouncesz = host->max_seg_size;
197 if (bouncesz > (host->max_blk_count * 512))
198 bouncesz = host->max_blk_count * 512;
199
200 if (bouncesz > 512) {
201 mqrq_cur->bounce_buf = kmalloc(bouncesz, GFP_KERNEL);
202 if (!mqrq_cur->bounce_buf) {
203 pr_warning("%s: unable to "
204 "allocate bounce cur buffer\n",
205 mmc_card_name(card));
206 }
207 mqrq_prev->bounce_buf = kmalloc(bouncesz, GFP_KERNEL);
208 if (!mqrq_prev->bounce_buf) {
209 pr_warning("%s: unable to "
210 "allocate bounce prev buffer\n",
211 mmc_card_name(card));
212 kfree(mqrq_cur->bounce_buf);
213 mqrq_cur->bounce_buf = NULL;
214 }
215 }
216
217 if (mqrq_cur->bounce_buf && mqrq_prev->bounce_buf) {
218 blk_queue_bounce_limit(mq->queue, BLK_BOUNCE_ANY);
219 blk_queue_max_hw_sectors(mq->queue, bouncesz / 512);
220 blk_queue_max_segments(mq->queue, bouncesz / 512);
221 blk_queue_max_segment_size(mq->queue, bouncesz);
222
223 mqrq_cur->sg = mmc_alloc_sg(1, &ret);
224 if (ret)
225 goto cleanup_queue;
226
227 mqrq_cur->bounce_sg =
228 mmc_alloc_sg(bouncesz / 512, &ret);
229 if (ret)
230 goto cleanup_queue;
231
232 mqrq_prev->sg = mmc_alloc_sg(1, &ret);
233 if (ret)
234 goto cleanup_queue;
235
236 mqrq_prev->bounce_sg =
237 mmc_alloc_sg(bouncesz / 512, &ret);
238 if (ret)
239 goto cleanup_queue;
240 }
241 }
242#endif
243
244 if (!mqrq_cur->bounce_buf && !mqrq_prev->bounce_buf) {
245 blk_queue_bounce_limit(mq->queue, limit);
246 blk_queue_max_hw_sectors(mq->queue,
247 min(host->max_blk_count, host->max_req_size / 512));
248 blk_queue_max_segments(mq->queue, host->max_segs);
249 blk_queue_max_segment_size(mq->queue, host->max_seg_size);
250
251 mqrq_cur->sg = mmc_alloc_sg(host->max_segs, &ret);
252 if (ret)
253 goto cleanup_queue;
254
255
256 mqrq_prev->sg = mmc_alloc_sg(host->max_segs, &ret);
257 if (ret)
258 goto cleanup_queue;
259 }
260
261 sema_init(&mq->thread_sem, 1);
262
263 mq->thread = kthread_run(mmc_queue_thread, mq, "mmcqd/%d%s",
264 host->index, subname ? subname : "");
265
266 if (IS_ERR(mq->thread)) {
267 ret = PTR_ERR(mq->thread);
268 goto free_bounce_sg;
269 }
270
271 return 0;
272 free_bounce_sg:
273 kfree(mqrq_cur->bounce_sg);
274 mqrq_cur->bounce_sg = NULL;
275 kfree(mqrq_prev->bounce_sg);
276 mqrq_prev->bounce_sg = NULL;
277
278 cleanup_queue:
279 kfree(mqrq_cur->sg);
280 mqrq_cur->sg = NULL;
281 kfree(mqrq_cur->bounce_buf);
282 mqrq_cur->bounce_buf = NULL;
283
284 kfree(mqrq_prev->sg);
285 mqrq_prev->sg = NULL;
286 kfree(mqrq_prev->bounce_buf);
287 mqrq_prev->bounce_buf = NULL;
288
289 blk_cleanup_queue(mq->queue);
290 return ret;
291}
292
293void mmc_cleanup_queue(struct mmc_queue *mq)
294{
295 struct request_queue *q = mq->queue;
296 unsigned long flags;
297 struct mmc_queue_req *mqrq_cur = mq->mqrq_cur;
298 struct mmc_queue_req *mqrq_prev = mq->mqrq_prev;
299
300 /* Make sure the queue isn't suspended, as that will deadlock */
301 mmc_queue_resume(mq);
302
303 /* Then terminate our worker thread */
304 kthread_stop(mq->thread);
305
306 /* Empty the queue */
307 spin_lock_irqsave(q->queue_lock, flags);
308 q->queuedata = NULL;
309 blk_start_queue(q);
310 spin_unlock_irqrestore(q->queue_lock, flags);
311
312 kfree(mqrq_cur->bounce_sg);
313 mqrq_cur->bounce_sg = NULL;
314
315 kfree(mqrq_cur->sg);
316 mqrq_cur->sg = NULL;
317
318 kfree(mqrq_cur->bounce_buf);
319 mqrq_cur->bounce_buf = NULL;
320
321 kfree(mqrq_prev->bounce_sg);
322 mqrq_prev->bounce_sg = NULL;
323
324 kfree(mqrq_prev->sg);
325 mqrq_prev->sg = NULL;
326
327 kfree(mqrq_prev->bounce_buf);
328 mqrq_prev->bounce_buf = NULL;
329
330 mq->card = NULL;
331}
332EXPORT_SYMBOL(mmc_cleanup_queue);
333
334/**
335 * mmc_queue_suspend - suspend a MMC request queue
336 * @mq: MMC queue to suspend
337 *
338 * Stop the block request queue, and wait for our thread to
339 * complete any outstanding requests. This ensures that we
340 * won't suspend while a request is being processed.
341 */
342void mmc_queue_suspend(struct mmc_queue *mq)
343{
344 struct request_queue *q = mq->queue;
345 unsigned long flags;
346
347 if (!(mq->flags & MMC_QUEUE_SUSPENDED)) {
348 mq->flags |= MMC_QUEUE_SUSPENDED;
349
350 spin_lock_irqsave(q->queue_lock, flags);
351 blk_stop_queue(q);
352 spin_unlock_irqrestore(q->queue_lock, flags);
353
354 down(&mq->thread_sem);
355 }
356}
357
358/**
359 * mmc_queue_resume - resume a previously suspended MMC request queue
360 * @mq: MMC queue to resume
361 */
362void mmc_queue_resume(struct mmc_queue *mq)
363{
364 struct request_queue *q = mq->queue;
365 unsigned long flags;
366
367 if (mq->flags & MMC_QUEUE_SUSPENDED) {
368 mq->flags &= ~MMC_QUEUE_SUSPENDED;
369
370 up(&mq->thread_sem);
371
372 spin_lock_irqsave(q->queue_lock, flags);
373 blk_start_queue(q);
374 spin_unlock_irqrestore(q->queue_lock, flags);
375 }
376}
377
378/*
379 * Prepare the sg list(s) to be handed of to the host driver
380 */
381unsigned int mmc_queue_map_sg(struct mmc_queue *mq, struct mmc_queue_req *mqrq)
382{
383 unsigned int sg_len;
384 size_t buflen;
385 struct scatterlist *sg;
386 int i;
387
388 if (!mqrq->bounce_buf)
389 return blk_rq_map_sg(mq->queue, mqrq->req, mqrq->sg);
390
391 BUG_ON(!mqrq->bounce_sg);
392
393 sg_len = blk_rq_map_sg(mq->queue, mqrq->req, mqrq->bounce_sg);
394
395 mqrq->bounce_sg_len = sg_len;
396
397 buflen = 0;
398 for_each_sg(mqrq->bounce_sg, sg, sg_len, i)
399 buflen += sg->length;
400
401 sg_init_one(mqrq->sg, mqrq->bounce_buf, buflen);
402
403 return 1;
404}
405
406/*
407 * If writing, bounce the data to the buffer before the request
408 * is sent to the host driver
409 */
410void mmc_queue_bounce_pre(struct mmc_queue_req *mqrq)
411{
412 if (!mqrq->bounce_buf)
413 return;
414
415 if (rq_data_dir(mqrq->req) != WRITE)
416 return;
417
418 sg_copy_to_buffer(mqrq->bounce_sg, mqrq->bounce_sg_len,
419 mqrq->bounce_buf, mqrq->sg[0].length);
420}
421
422/*
423 * If reading, bounce the data from the buffer after the request
424 * has been handled by the host driver
425 */
426void mmc_queue_bounce_post(struct mmc_queue_req *mqrq)
427{
428 if (!mqrq->bounce_buf)
429 return;
430
431 if (rq_data_dir(mqrq->req) != READ)
432 return;
433
434 sg_copy_from_buffer(mqrq->bounce_sg, mqrq->bounce_sg_len,
435 mqrq->bounce_buf, mqrq->sg[0].length);
436}
1/*
2 * linux/drivers/mmc/card/queue.c
3 *
4 * Copyright (C) 2003 Russell King, All Rights Reserved.
5 * Copyright 2006-2007 Pierre Ossman
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 */
12#include <linux/slab.h>
13#include <linux/module.h>
14#include <linux/blkdev.h>
15#include <linux/freezer.h>
16#include <linux/kthread.h>
17#include <linux/scatterlist.h>
18
19#include <linux/mmc/card.h>
20#include <linux/mmc/host.h>
21#include "queue.h"
22
23#define MMC_QUEUE_BOUNCESZ 65536
24
25#define MMC_QUEUE_SUSPENDED (1 << 0)
26
27/*
28 * Prepare a MMC request. This just filters out odd stuff.
29 */
30static int mmc_prep_request(struct request_queue *q, struct request *req)
31{
32 /*
33 * We only like normal block requests and discards.
34 */
35 if (req->cmd_type != REQ_TYPE_FS && !(req->cmd_flags & REQ_DISCARD)) {
36 blk_dump_rq_flags(req, "MMC bad request");
37 return BLKPREP_KILL;
38 }
39
40 req->cmd_flags |= REQ_DONTPREP;
41
42 return BLKPREP_OK;
43}
44
45static int mmc_queue_thread(void *d)
46{
47 struct mmc_queue *mq = d;
48 struct request_queue *q = mq->queue;
49
50 current->flags |= PF_MEMALLOC;
51
52 down(&mq->thread_sem);
53 do {
54 struct request *req = NULL;
55 struct mmc_queue_req *tmp;
56
57 spin_lock_irq(q->queue_lock);
58 set_current_state(TASK_INTERRUPTIBLE);
59 req = blk_fetch_request(q);
60 mq->mqrq_cur->req = req;
61 spin_unlock_irq(q->queue_lock);
62
63 if (req || mq->mqrq_prev->req) {
64 set_current_state(TASK_RUNNING);
65 mq->issue_fn(mq, req);
66 } else {
67 if (kthread_should_stop()) {
68 set_current_state(TASK_RUNNING);
69 break;
70 }
71 up(&mq->thread_sem);
72 schedule();
73 down(&mq->thread_sem);
74 }
75
76 /* Current request becomes previous request and vice versa. */
77 mq->mqrq_prev->brq.mrq.data = NULL;
78 mq->mqrq_prev->req = NULL;
79 tmp = mq->mqrq_prev;
80 mq->mqrq_prev = mq->mqrq_cur;
81 mq->mqrq_cur = tmp;
82 } while (1);
83 up(&mq->thread_sem);
84
85 return 0;
86}
87
88/*
89 * Generic MMC request handler. This is called for any queue on a
90 * particular host. When the host is not busy, we look for a request
91 * on any queue on this host, and attempt to issue it. This may
92 * not be the queue we were asked to process.
93 */
94static void mmc_request(struct request_queue *q)
95{
96 struct mmc_queue *mq = q->queuedata;
97 struct request *req;
98
99 if (!mq) {
100 while ((req = blk_fetch_request(q)) != NULL) {
101 req->cmd_flags |= REQ_QUIET;
102 __blk_end_request_all(req, -EIO);
103 }
104 return;
105 }
106
107 if (!mq->mqrq_cur->req && !mq->mqrq_prev->req)
108 wake_up_process(mq->thread);
109}
110
111struct scatterlist *mmc_alloc_sg(int sg_len, int *err)
112{
113 struct scatterlist *sg;
114
115 sg = kmalloc(sizeof(struct scatterlist)*sg_len, GFP_KERNEL);
116 if (!sg)
117 *err = -ENOMEM;
118 else {
119 *err = 0;
120 sg_init_table(sg, sg_len);
121 }
122
123 return sg;
124}
125
126static void mmc_queue_setup_discard(struct request_queue *q,
127 struct mmc_card *card)
128{
129 unsigned max_discard;
130
131 max_discard = mmc_calc_max_discard(card);
132 if (!max_discard)
133 return;
134
135 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
136 q->limits.max_discard_sectors = max_discard;
137 if (card->erased_byte == 0)
138 q->limits.discard_zeroes_data = 1;
139 q->limits.discard_granularity = card->pref_erase << 9;
140 /* granularity must not be greater than max. discard */
141 if (card->pref_erase > max_discard)
142 q->limits.discard_granularity = 0;
143 if (mmc_can_secure_erase_trim(card))
144 queue_flag_set_unlocked(QUEUE_FLAG_SECDISCARD, q);
145}
146
147/**
148 * mmc_init_queue - initialise a queue structure.
149 * @mq: mmc queue
150 * @card: mmc card to attach this queue
151 * @lock: queue lock
152 * @subname: partition subname
153 *
154 * Initialise a MMC card request queue.
155 */
156int mmc_init_queue(struct mmc_queue *mq, struct mmc_card *card,
157 spinlock_t *lock, const char *subname)
158{
159 struct mmc_host *host = card->host;
160 u64 limit = BLK_BOUNCE_HIGH;
161 int ret;
162 struct mmc_queue_req *mqrq_cur = &mq->mqrq[0];
163 struct mmc_queue_req *mqrq_prev = &mq->mqrq[1];
164
165 if (mmc_dev(host)->dma_mask && *mmc_dev(host)->dma_mask)
166 limit = *mmc_dev(host)->dma_mask;
167
168 mq->card = card;
169 mq->queue = blk_init_queue(mmc_request, lock);
170 if (!mq->queue)
171 return -ENOMEM;
172
173 memset(&mq->mqrq_cur, 0, sizeof(mq->mqrq_cur));
174 memset(&mq->mqrq_prev, 0, sizeof(mq->mqrq_prev));
175 mq->mqrq_cur = mqrq_cur;
176 mq->mqrq_prev = mqrq_prev;
177 mq->queue->queuedata = mq;
178
179 blk_queue_prep_rq(mq->queue, mmc_prep_request);
180 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, mq->queue);
181 if (mmc_can_erase(card))
182 mmc_queue_setup_discard(mq->queue, card);
183
184#ifdef CONFIG_MMC_BLOCK_BOUNCE
185 if (host->max_segs == 1) {
186 unsigned int bouncesz;
187
188 bouncesz = MMC_QUEUE_BOUNCESZ;
189
190 if (bouncesz > host->max_req_size)
191 bouncesz = host->max_req_size;
192 if (bouncesz > host->max_seg_size)
193 bouncesz = host->max_seg_size;
194 if (bouncesz > (host->max_blk_count * 512))
195 bouncesz = host->max_blk_count * 512;
196
197 if (bouncesz > 512) {
198 mqrq_cur->bounce_buf = kmalloc(bouncesz, GFP_KERNEL);
199 if (!mqrq_cur->bounce_buf) {
200 printk(KERN_WARNING "%s: unable to "
201 "allocate bounce cur buffer\n",
202 mmc_card_name(card));
203 }
204 mqrq_prev->bounce_buf = kmalloc(bouncesz, GFP_KERNEL);
205 if (!mqrq_prev->bounce_buf) {
206 printk(KERN_WARNING "%s: unable to "
207 "allocate bounce prev buffer\n",
208 mmc_card_name(card));
209 kfree(mqrq_cur->bounce_buf);
210 mqrq_cur->bounce_buf = NULL;
211 }
212 }
213
214 if (mqrq_cur->bounce_buf && mqrq_prev->bounce_buf) {
215 blk_queue_bounce_limit(mq->queue, BLK_BOUNCE_ANY);
216 blk_queue_max_hw_sectors(mq->queue, bouncesz / 512);
217 blk_queue_max_segments(mq->queue, bouncesz / 512);
218 blk_queue_max_segment_size(mq->queue, bouncesz);
219
220 mqrq_cur->sg = mmc_alloc_sg(1, &ret);
221 if (ret)
222 goto cleanup_queue;
223
224 mqrq_cur->bounce_sg =
225 mmc_alloc_sg(bouncesz / 512, &ret);
226 if (ret)
227 goto cleanup_queue;
228
229 mqrq_prev->sg = mmc_alloc_sg(1, &ret);
230 if (ret)
231 goto cleanup_queue;
232
233 mqrq_prev->bounce_sg =
234 mmc_alloc_sg(bouncesz / 512, &ret);
235 if (ret)
236 goto cleanup_queue;
237 }
238 }
239#endif
240
241 if (!mqrq_cur->bounce_buf && !mqrq_prev->bounce_buf) {
242 blk_queue_bounce_limit(mq->queue, limit);
243 blk_queue_max_hw_sectors(mq->queue,
244 min(host->max_blk_count, host->max_req_size / 512));
245 blk_queue_max_segments(mq->queue, host->max_segs);
246 blk_queue_max_segment_size(mq->queue, host->max_seg_size);
247
248 mqrq_cur->sg = mmc_alloc_sg(host->max_segs, &ret);
249 if (ret)
250 goto cleanup_queue;
251
252
253 mqrq_prev->sg = mmc_alloc_sg(host->max_segs, &ret);
254 if (ret)
255 goto cleanup_queue;
256 }
257
258 sema_init(&mq->thread_sem, 1);
259
260 mq->thread = kthread_run(mmc_queue_thread, mq, "mmcqd/%d%s",
261 host->index, subname ? subname : "");
262
263 if (IS_ERR(mq->thread)) {
264 ret = PTR_ERR(mq->thread);
265 goto free_bounce_sg;
266 }
267
268 return 0;
269 free_bounce_sg:
270 kfree(mqrq_cur->bounce_sg);
271 mqrq_cur->bounce_sg = NULL;
272 kfree(mqrq_prev->bounce_sg);
273 mqrq_prev->bounce_sg = NULL;
274
275 cleanup_queue:
276 kfree(mqrq_cur->sg);
277 mqrq_cur->sg = NULL;
278 kfree(mqrq_cur->bounce_buf);
279 mqrq_cur->bounce_buf = NULL;
280
281 kfree(mqrq_prev->sg);
282 mqrq_prev->sg = NULL;
283 kfree(mqrq_prev->bounce_buf);
284 mqrq_prev->bounce_buf = NULL;
285
286 blk_cleanup_queue(mq->queue);
287 return ret;
288}
289
290void mmc_cleanup_queue(struct mmc_queue *mq)
291{
292 struct request_queue *q = mq->queue;
293 unsigned long flags;
294 struct mmc_queue_req *mqrq_cur = mq->mqrq_cur;
295 struct mmc_queue_req *mqrq_prev = mq->mqrq_prev;
296
297 /* Make sure the queue isn't suspended, as that will deadlock */
298 mmc_queue_resume(mq);
299
300 /* Then terminate our worker thread */
301 kthread_stop(mq->thread);
302
303 /* Empty the queue */
304 spin_lock_irqsave(q->queue_lock, flags);
305 q->queuedata = NULL;
306 blk_start_queue(q);
307 spin_unlock_irqrestore(q->queue_lock, flags);
308
309 kfree(mqrq_cur->bounce_sg);
310 mqrq_cur->bounce_sg = NULL;
311
312 kfree(mqrq_cur->sg);
313 mqrq_cur->sg = NULL;
314
315 kfree(mqrq_cur->bounce_buf);
316 mqrq_cur->bounce_buf = NULL;
317
318 kfree(mqrq_prev->bounce_sg);
319 mqrq_prev->bounce_sg = NULL;
320
321 kfree(mqrq_prev->sg);
322 mqrq_prev->sg = NULL;
323
324 kfree(mqrq_prev->bounce_buf);
325 mqrq_prev->bounce_buf = NULL;
326
327 mq->card = NULL;
328}
329EXPORT_SYMBOL(mmc_cleanup_queue);
330
331/**
332 * mmc_queue_suspend - suspend a MMC request queue
333 * @mq: MMC queue to suspend
334 *
335 * Stop the block request queue, and wait for our thread to
336 * complete any outstanding requests. This ensures that we
337 * won't suspend while a request is being processed.
338 */
339void mmc_queue_suspend(struct mmc_queue *mq)
340{
341 struct request_queue *q = mq->queue;
342 unsigned long flags;
343
344 if (!(mq->flags & MMC_QUEUE_SUSPENDED)) {
345 mq->flags |= MMC_QUEUE_SUSPENDED;
346
347 spin_lock_irqsave(q->queue_lock, flags);
348 blk_stop_queue(q);
349 spin_unlock_irqrestore(q->queue_lock, flags);
350
351 down(&mq->thread_sem);
352 }
353}
354
355/**
356 * mmc_queue_resume - resume a previously suspended MMC request queue
357 * @mq: MMC queue to resume
358 */
359void mmc_queue_resume(struct mmc_queue *mq)
360{
361 struct request_queue *q = mq->queue;
362 unsigned long flags;
363
364 if (mq->flags & MMC_QUEUE_SUSPENDED) {
365 mq->flags &= ~MMC_QUEUE_SUSPENDED;
366
367 up(&mq->thread_sem);
368
369 spin_lock_irqsave(q->queue_lock, flags);
370 blk_start_queue(q);
371 spin_unlock_irqrestore(q->queue_lock, flags);
372 }
373}
374
375/*
376 * Prepare the sg list(s) to be handed of to the host driver
377 */
378unsigned int mmc_queue_map_sg(struct mmc_queue *mq, struct mmc_queue_req *mqrq)
379{
380 unsigned int sg_len;
381 size_t buflen;
382 struct scatterlist *sg;
383 int i;
384
385 if (!mqrq->bounce_buf)
386 return blk_rq_map_sg(mq->queue, mqrq->req, mqrq->sg);
387
388 BUG_ON(!mqrq->bounce_sg);
389
390 sg_len = blk_rq_map_sg(mq->queue, mqrq->req, mqrq->bounce_sg);
391
392 mqrq->bounce_sg_len = sg_len;
393
394 buflen = 0;
395 for_each_sg(mqrq->bounce_sg, sg, sg_len, i)
396 buflen += sg->length;
397
398 sg_init_one(mqrq->sg, mqrq->bounce_buf, buflen);
399
400 return 1;
401}
402
403/*
404 * If writing, bounce the data to the buffer before the request
405 * is sent to the host driver
406 */
407void mmc_queue_bounce_pre(struct mmc_queue_req *mqrq)
408{
409 if (!mqrq->bounce_buf)
410 return;
411
412 if (rq_data_dir(mqrq->req) != WRITE)
413 return;
414
415 sg_copy_to_buffer(mqrq->bounce_sg, mqrq->bounce_sg_len,
416 mqrq->bounce_buf, mqrq->sg[0].length);
417}
418
419/*
420 * If reading, bounce the data from the buffer after the request
421 * has been handled by the host driver
422 */
423void mmc_queue_bounce_post(struct mmc_queue_req *mqrq)
424{
425 if (!mqrq->bounce_buf)
426 return;
427
428 if (rq_data_dir(mqrq->req) != READ)
429 return;
430
431 sg_copy_from_buffer(mqrq->bounce_sg, mqrq->bounce_sg_len,
432 mqrq->bounce_buf, mqrq->sg[0].length);
433}