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git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - drivers/mmc/card/queue.c
2 * linux/drivers/mmc/card/queue.c
4 * Copyright (C) 2003 Russell King, All Rights Reserved.
5 * Copyright 2006-2007 Pierre Ossman
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.
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>
19 #include <linux/mmc/card.h>
20 #include <linux/mmc/host.h>
23 #define MMC_QUEUE_BOUNCESZ 65536
25 #define MMC_QUEUE_SUSPENDED (1 << 0)
28 * Prepare a MMC request. This just filters out odd stuff.
30 static int mmc_prep_request(struct request_queue
*q
, struct request
*req
)
33 * We only like normal block requests and discards.
35 if (req
->cmd_type
!= REQ_TYPE_FS
&& !(req
->cmd_flags
& REQ_DISCARD
)) {
36 blk_dump_rq_flags(req
, "MMC bad request");
40 req
->cmd_flags
|= REQ_DONTPREP
;
45 static int mmc_queue_thread(void *d
)
47 struct mmc_queue
*mq
= d
;
48 struct request_queue
*q
= mq
->queue
;
50 current
->flags
|= PF_MEMALLOC
;
52 down(&mq
->thread_sem
);
54 struct request
*req
= NULL
;
56 spin_lock_irq(q
->queue_lock
);
57 set_current_state(TASK_INTERRUPTIBLE
);
58 if (!blk_queue_plugged(q
))
59 req
= blk_fetch_request(q
);
61 spin_unlock_irq(q
->queue_lock
);
64 if (kthread_should_stop()) {
65 set_current_state(TASK_RUNNING
);
70 down(&mq
->thread_sem
);
73 set_current_state(TASK_RUNNING
);
75 mq
->issue_fn(mq
, req
);
83 * Generic MMC request handler. This is called for any queue on a
84 * particular host. When the host is not busy, we look for a request
85 * on any queue on this host, and attempt to issue it. This may
86 * not be the queue we were asked to process.
88 static void mmc_request(struct request_queue
*q
)
90 struct mmc_queue
*mq
= q
->queuedata
;
94 while ((req
= blk_fetch_request(q
)) != NULL
) {
95 req
->cmd_flags
|= REQ_QUIET
;
96 __blk_end_request_all(req
, -EIO
);
102 wake_up_process(mq
->thread
);
106 * mmc_init_queue - initialise a queue structure.
108 * @card: mmc card to attach this queue
111 * Initialise a MMC card request queue.
113 int mmc_init_queue(struct mmc_queue
*mq
, struct mmc_card
*card
, spinlock_t
*lock
)
115 struct mmc_host
*host
= card
->host
;
116 u64 limit
= BLK_BOUNCE_HIGH
;
119 if (mmc_dev(host
)->dma_mask
&& *mmc_dev(host
)->dma_mask
)
120 limit
= *mmc_dev(host
)->dma_mask
;
123 mq
->queue
= blk_init_queue(mmc_request
, lock
);
127 mq
->queue
->queuedata
= mq
;
130 blk_queue_prep_rq(mq
->queue
, mmc_prep_request
);
131 queue_flag_set_unlocked(QUEUE_FLAG_NONROT
, mq
->queue
);
132 if (mmc_can_erase(card
)) {
133 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD
, mq
->queue
);
134 mq
->queue
->limits
.max_discard_sectors
= UINT_MAX
;
135 if (card
->erased_byte
== 0)
136 mq
->queue
->limits
.discard_zeroes_data
= 1;
137 if (!mmc_can_trim(card
) && is_power_of_2(card
->erase_size
)) {
138 mq
->queue
->limits
.discard_granularity
=
139 card
->erase_size
<< 9;
140 mq
->queue
->limits
.discard_alignment
=
141 card
->erase_size
<< 9;
143 if (mmc_can_secure_erase_trim(card
))
144 queue_flag_set_unlocked(QUEUE_FLAG_SECDISCARD
,
148 #ifdef CONFIG_MMC_BLOCK_BOUNCE
149 if (host
->max_hw_segs
== 1) {
150 unsigned int bouncesz
;
152 bouncesz
= MMC_QUEUE_BOUNCESZ
;
154 if (bouncesz
> host
->max_req_size
)
155 bouncesz
= host
->max_req_size
;
156 if (bouncesz
> host
->max_seg_size
)
157 bouncesz
= host
->max_seg_size
;
158 if (bouncesz
> (host
->max_blk_count
* 512))
159 bouncesz
= host
->max_blk_count
* 512;
161 if (bouncesz
> 512) {
162 mq
->bounce_buf
= kmalloc(bouncesz
, GFP_KERNEL
);
163 if (!mq
->bounce_buf
) {
164 printk(KERN_WARNING
"%s: unable to "
165 "allocate bounce buffer\n",
166 mmc_card_name(card
));
170 if (mq
->bounce_buf
) {
171 blk_queue_bounce_limit(mq
->queue
, BLK_BOUNCE_ANY
);
172 blk_queue_max_hw_sectors(mq
->queue
, bouncesz
/ 512);
173 blk_queue_max_segments(mq
->queue
, bouncesz
/ 512);
174 blk_queue_max_segment_size(mq
->queue
, bouncesz
);
176 mq
->sg
= kmalloc(sizeof(struct scatterlist
),
182 sg_init_table(mq
->sg
, 1);
184 mq
->bounce_sg
= kmalloc(sizeof(struct scatterlist
) *
185 bouncesz
/ 512, GFP_KERNEL
);
186 if (!mq
->bounce_sg
) {
190 sg_init_table(mq
->bounce_sg
, bouncesz
/ 512);
195 if (!mq
->bounce_buf
) {
196 blk_queue_bounce_limit(mq
->queue
, limit
);
197 blk_queue_max_hw_sectors(mq
->queue
,
198 min(host
->max_blk_count
, host
->max_req_size
/ 512));
199 blk_queue_max_segments(mq
->queue
, host
->max_hw_segs
);
200 blk_queue_max_segment_size(mq
->queue
, host
->max_seg_size
);
202 mq
->sg
= kmalloc(sizeof(struct scatterlist
) *
203 host
->max_phys_segs
, GFP_KERNEL
);
208 sg_init_table(mq
->sg
, host
->max_phys_segs
);
211 init_MUTEX(&mq
->thread_sem
);
213 mq
->thread
= kthread_run(mmc_queue_thread
, mq
, "mmcqd");
214 if (IS_ERR(mq
->thread
)) {
215 ret
= PTR_ERR(mq
->thread
);
222 kfree(mq
->bounce_sg
);
223 mq
->bounce_sg
= NULL
;
229 kfree(mq
->bounce_buf
);
230 mq
->bounce_buf
= NULL
;
231 blk_cleanup_queue(mq
->queue
);
235 void mmc_cleanup_queue(struct mmc_queue
*mq
)
237 struct request_queue
*q
= mq
->queue
;
240 /* Make sure the queue isn't suspended, as that will deadlock */
241 mmc_queue_resume(mq
);
243 /* Then terminate our worker thread */
244 kthread_stop(mq
->thread
);
246 /* Empty the queue */
247 spin_lock_irqsave(q
->queue_lock
, flags
);
250 spin_unlock_irqrestore(q
->queue_lock
, flags
);
253 kfree(mq
->bounce_sg
);
254 mq
->bounce_sg
= NULL
;
260 kfree(mq
->bounce_buf
);
261 mq
->bounce_buf
= NULL
;
265 EXPORT_SYMBOL(mmc_cleanup_queue
);
268 * mmc_queue_suspend - suspend a MMC request queue
269 * @mq: MMC queue to suspend
271 * Stop the block request queue, and wait for our thread to
272 * complete any outstanding requests. This ensures that we
273 * won't suspend while a request is being processed.
275 void mmc_queue_suspend(struct mmc_queue
*mq
)
277 struct request_queue
*q
= mq
->queue
;
280 if (!(mq
->flags
& MMC_QUEUE_SUSPENDED
)) {
281 mq
->flags
|= MMC_QUEUE_SUSPENDED
;
283 spin_lock_irqsave(q
->queue_lock
, flags
);
285 spin_unlock_irqrestore(q
->queue_lock
, flags
);
287 down(&mq
->thread_sem
);
292 * mmc_queue_resume - resume a previously suspended MMC request queue
293 * @mq: MMC queue to resume
295 void mmc_queue_resume(struct mmc_queue
*mq
)
297 struct request_queue
*q
= mq
->queue
;
300 if (mq
->flags
& MMC_QUEUE_SUSPENDED
) {
301 mq
->flags
&= ~MMC_QUEUE_SUSPENDED
;
305 spin_lock_irqsave(q
->queue_lock
, flags
);
307 spin_unlock_irqrestore(q
->queue_lock
, flags
);
312 * Prepare the sg list(s) to be handed of to the host driver
314 unsigned int mmc_queue_map_sg(struct mmc_queue
*mq
)
318 struct scatterlist
*sg
;
322 return blk_rq_map_sg(mq
->queue
, mq
->req
, mq
->sg
);
324 BUG_ON(!mq
->bounce_sg
);
326 sg_len
= blk_rq_map_sg(mq
->queue
, mq
->req
, mq
->bounce_sg
);
328 mq
->bounce_sg_len
= sg_len
;
331 for_each_sg(mq
->bounce_sg
, sg
, sg_len
, i
)
332 buflen
+= sg
->length
;
334 sg_init_one(mq
->sg
, mq
->bounce_buf
, buflen
);
340 * If writing, bounce the data to the buffer before the request
341 * is sent to the host driver
343 void mmc_queue_bounce_pre(struct mmc_queue
*mq
)
350 if (rq_data_dir(mq
->req
) != WRITE
)
353 local_irq_save(flags
);
354 sg_copy_to_buffer(mq
->bounce_sg
, mq
->bounce_sg_len
,
355 mq
->bounce_buf
, mq
->sg
[0].length
);
356 local_irq_restore(flags
);
360 * If reading, bounce the data from the buffer after the request
361 * has been handled by the host driver
363 void mmc_queue_bounce_post(struct mmc_queue
*mq
)
370 if (rq_data_dir(mq
->req
) != READ
)
373 local_irq_save(flags
);
374 sg_copy_from_buffer(mq
->bounce_sg
, mq
->bounce_sg_len
,
375 mq
->bounce_buf
, mq
->sg
[0].length
);
376 local_irq_restore(flags
);