Loading...
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#include <linux/dma-mapping.h>
19
20#include <linux/mmc/card.h>
21#include <linux/mmc/host.h>
22#include "queue.h"
23
24#define MMC_QUEUE_BOUNCESZ 65536
25
26/*
27 * Prepare a MMC request. This just filters out odd stuff.
28 */
29static int mmc_prep_request(struct request_queue *q, struct request *req)
30{
31 struct mmc_queue *mq = q->queuedata;
32
33 /*
34 * We only like normal block requests and discards.
35 */
36 if (req->cmd_type != REQ_TYPE_FS && !(req->cmd_flags & REQ_DISCARD)) {
37 blk_dump_rq_flags(req, "MMC bad request");
38 return BLKPREP_KILL;
39 }
40
41 if (mq && (mmc_card_removed(mq->card) || mmc_access_rpmb(mq)))
42 return BLKPREP_KILL;
43
44 req->cmd_flags |= REQ_DONTPREP;
45
46 return BLKPREP_OK;
47}
48
49static int mmc_queue_thread(void *d)
50{
51 struct mmc_queue *mq = d;
52 struct request_queue *q = mq->queue;
53
54 current->flags |= PF_MEMALLOC;
55
56 down(&mq->thread_sem);
57 do {
58 struct request *req = NULL;
59 unsigned int cmd_flags = 0;
60
61 spin_lock_irq(q->queue_lock);
62 set_current_state(TASK_INTERRUPTIBLE);
63 req = blk_fetch_request(q);
64 mq->mqrq_cur->req = req;
65 spin_unlock_irq(q->queue_lock);
66
67 if (req || mq->mqrq_prev->req) {
68 set_current_state(TASK_RUNNING);
69 cmd_flags = req ? req->cmd_flags : 0;
70 mq->issue_fn(mq, req);
71 cond_resched();
72 if (mq->flags & MMC_QUEUE_NEW_REQUEST) {
73 mq->flags &= ~MMC_QUEUE_NEW_REQUEST;
74 continue; /* fetch again */
75 }
76
77 /*
78 * Current request becomes previous request
79 * and vice versa.
80 * In case of special requests, current request
81 * has been finished. Do not assign it to previous
82 * request.
83 */
84 if (cmd_flags & MMC_REQ_SPECIAL_MASK)
85 mq->mqrq_cur->req = NULL;
86
87 mq->mqrq_prev->brq.mrq.data = NULL;
88 mq->mqrq_prev->req = NULL;
89 swap(mq->mqrq_prev, mq->mqrq_cur);
90 } else {
91 if (kthread_should_stop()) {
92 set_current_state(TASK_RUNNING);
93 break;
94 }
95 up(&mq->thread_sem);
96 schedule();
97 down(&mq->thread_sem);
98 }
99 } while (1);
100 up(&mq->thread_sem);
101
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 */
111static void mmc_request_fn(struct request_queue *q)
112{
113 struct mmc_queue *mq = q->queuedata;
114 struct request *req;
115 unsigned long flags;
116 struct mmc_context_info *cntx;
117
118 if (!mq) {
119 while ((req = blk_fetch_request(q)) != NULL) {
120 req->cmd_flags |= REQ_QUIET;
121 __blk_end_request_all(req, -EIO);
122 }
123 return;
124 }
125
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)
140 wake_up_process(mq->thread);
141}
142
143static struct scatterlist *mmc_alloc_sg(int sg_len, int *err)
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
158static 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);
168 blk_queue_max_discard_sectors(q, max_discard);
169 if (card->erased_byte == 0 && !mmc_can_discard(card))
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;
175 if (mmc_can_secure_erase_trim(card))
176 queue_flag_set_unlocked(QUEUE_FLAG_SECDISCARD, q);
177}
178
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
184 * @subname: partition subname
185 *
186 * Initialise a MMC card request queue.
187 */
188int mmc_init_queue(struct mmc_queue *mq, struct mmc_card *card,
189 spinlock_t *lock, const char *subname)
190{
191 struct mmc_host *host = card->host;
192 u64 limit = BLK_BOUNCE_HIGH;
193 int ret;
194 struct mmc_queue_req *mqrq_cur = &mq->mqrq[0];
195 struct mmc_queue_req *mqrq_prev = &mq->mqrq[1];
196
197 if (mmc_dev(host)->dma_mask && *mmc_dev(host)->dma_mask)
198 limit = (u64)dma_max_pfn(mmc_dev(host)) << PAGE_SHIFT;
199
200 mq->card = card;
201 mq->queue = blk_init_queue(mmc_request_fn, lock);
202 if (!mq->queue)
203 return -ENOMEM;
204
205 mq->mqrq_cur = mqrq_cur;
206 mq->mqrq_prev = mqrq_prev;
207 mq->queue->queuedata = mq;
208
209 blk_queue_prep_rq(mq->queue, mmc_prep_request);
210 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, mq->queue);
211 queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, mq->queue);
212 if (mmc_can_erase(card))
213 mmc_queue_setup_discard(mq->queue, card);
214
215#ifdef CONFIG_MMC_BLOCK_BOUNCE
216 if (host->max_segs == 1) {
217 unsigned int bouncesz;
218
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;
225 if (bouncesz > (host->max_blk_count * 512))
226 bouncesz = host->max_blk_count * 512;
227
228 if (bouncesz > 512) {
229 mqrq_cur->bounce_buf = kmalloc(bouncesz, GFP_KERNEL);
230 if (!mqrq_cur->bounce_buf) {
231 pr_warn("%s: unable to allocate bounce cur buffer\n",
232 mmc_card_name(card));
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 }
242 }
243 }
244
245 if (mqrq_cur->bounce_buf && mqrq_prev->bounce_buf) {
246 blk_queue_bounce_limit(mq->queue, BLK_BOUNCE_ANY);
247 blk_queue_max_hw_sectors(mq->queue, bouncesz / 512);
248 blk_queue_max_segments(mq->queue, bouncesz / 512);
249 blk_queue_max_segment_size(mq->queue, bouncesz);
250
251 mqrq_cur->sg = mmc_alloc_sg(1, &ret);
252 if (ret)
253 goto cleanup_queue;
254
255 mqrq_cur->bounce_sg =
256 mmc_alloc_sg(bouncesz / 512, &ret);
257 if (ret)
258 goto cleanup_queue;
259
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;
268 }
269 }
270#endif
271
272 if (!mqrq_cur->bounce_buf && !mqrq_prev->bounce_buf) {
273 blk_queue_bounce_limit(mq->queue, limit);
274 blk_queue_max_hw_sectors(mq->queue,
275 min(host->max_blk_count, host->max_req_size / 512));
276 blk_queue_max_segments(mq->queue, host->max_segs);
277 blk_queue_max_segment_size(mq->queue, host->max_seg_size);
278
279 mqrq_cur->sg = mmc_alloc_sg(host->max_segs, &ret);
280 if (ret)
281 goto cleanup_queue;
282
283
284 mqrq_prev->sg = mmc_alloc_sg(host->max_segs, &ret);
285 if (ret)
286 goto cleanup_queue;
287 }
288
289 sema_init(&mq->thread_sem, 1);
290
291 mq->thread = kthread_run(mmc_queue_thread, mq, "mmcqd/%d%s",
292 host->index, subname ? subname : "");
293
294 if (IS_ERR(mq->thread)) {
295 ret = PTR_ERR(mq->thread);
296 goto free_bounce_sg;
297 }
298
299 return 0;
300 free_bounce_sg:
301 kfree(mqrq_cur->bounce_sg);
302 mqrq_cur->bounce_sg = NULL;
303 kfree(mqrq_prev->bounce_sg);
304 mqrq_prev->bounce_sg = NULL;
305
306 cleanup_queue:
307 kfree(mqrq_cur->sg);
308 mqrq_cur->sg = NULL;
309 kfree(mqrq_cur->bounce_buf);
310 mqrq_cur->bounce_buf = NULL;
311
312 kfree(mqrq_prev->sg);
313 mqrq_prev->sg = NULL;
314 kfree(mqrq_prev->bounce_buf);
315 mqrq_prev->bounce_buf = NULL;
316
317 blk_cleanup_queue(mq->queue);
318 return ret;
319}
320
321void mmc_cleanup_queue(struct mmc_queue *mq)
322{
323 struct request_queue *q = mq->queue;
324 unsigned long flags;
325 struct mmc_queue_req *mqrq_cur = mq->mqrq_cur;
326 struct mmc_queue_req *mqrq_prev = mq->mqrq_prev;
327
328 /* Make sure the queue isn't suspended, as that will deadlock */
329 mmc_queue_resume(mq);
330
331 /* Then terminate our worker thread */
332 kthread_stop(mq->thread);
333
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
340 kfree(mqrq_cur->bounce_sg);
341 mqrq_cur->bounce_sg = NULL;
342
343 kfree(mqrq_cur->sg);
344 mqrq_cur->sg = NULL;
345
346 kfree(mqrq_cur->bounce_buf);
347 mqrq_cur->bounce_buf = NULL;
348
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
358 mq->card = NULL;
359}
360EXPORT_SYMBOL(mmc_cleanup_queue);
361
362int 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
390out:
391 return ret;
392}
393
394void 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
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 */
413void mmc_queue_suspend(struct mmc_queue *mq)
414{
415 struct request_queue *q = mq->queue;
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}
428
429/**
430 * mmc_queue_resume - resume a previously suspended MMC request queue
431 * @mq: MMC queue to resume
432 */
433void mmc_queue_resume(struct mmc_queue *mq)
434{
435 struct request_queue *q = mq->queue;
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}
448
449static 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;
470 sg_unmark_end(__sg++);
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);
478 sg_unmark_end(__sg++);
479 }
480 sg_mark_end(sg + (sg_len - 1));
481 return sg_len;
482}
483
484/*
485 * Prepare the sg list(s) to be handed of to the host driver
486 */
487unsigned int mmc_queue_map_sg(struct mmc_queue *mq, struct mmc_queue_req *mqrq)
488{
489 unsigned int sg_len;
490 size_t buflen;
491 struct scatterlist *sg;
492 enum mmc_packed_type cmd_type;
493 int i;
494
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 }
504
505 BUG_ON(!mqrq->bounce_sg);
506
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);
512
513 mqrq->bounce_sg_len = sg_len;
514
515 buflen = 0;
516 for_each_sg(mqrq->bounce_sg, sg, sg_len, i)
517 buflen += sg->length;
518
519 sg_init_one(mqrq->sg, mqrq->bounce_buf, buflen);
520
521 return 1;
522}
523
524/*
525 * If writing, bounce the data to the buffer before the request
526 * is sent to the host driver
527 */
528void mmc_queue_bounce_pre(struct mmc_queue_req *mqrq)
529{
530 if (!mqrq->bounce_buf)
531 return;
532
533 if (rq_data_dir(mqrq->req) != WRITE)
534 return;
535
536 sg_copy_to_buffer(mqrq->bounce_sg, mqrq->bounce_sg_len,
537 mqrq->bounce_buf, mqrq->sg[0].length);
538}
539
540/*
541 * If reading, bounce the data from the buffer after the request
542 * has been handled by the host driver
543 */
544void mmc_queue_bounce_post(struct mmc_queue_req *mqrq)
545{
546 if (!mqrq->bounce_buf)
547 return;
548
549 if (rq_data_dir(mqrq->req) != READ)
550 return;
551
552 sg_copy_from_buffer(mqrq->bounce_sg, mqrq->bounce_sg_len,
553 mqrq->bounce_buf, mqrq->sg[0].length);
554}