[net-next-2.6.git] / drivers / mmc / card / queue.c

/*
 *  linux/drivers/mmc/card/queue.c
 *
 *  Copyright (C) 2003 Russell King, All Rights Reserved.
 *  Copyright 2006-2007 Pierre Ossman
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 */
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/blkdev.h>
#include <linux/freezer.h>
#include <linux/kthread.h>
#include <linux/scatterlist.h>

#include <linux/mmc/card.h>
#include <linux/mmc/host.h>
#include "queue.h"

#define MMC_QUEUE_BOUNCESZ	65536

#define MMC_QUEUE_SUSPENDED	(1 << 0)

/*
 * Prepare a MMC request. This just filters out odd stuff.
 */
static int mmc_prep_request(struct request_queue *q, struct request *req)
{
	/*
	 * We only like normal block requests.
	 */
	if (!blk_fs_request(req)) {
		blk_dump_rq_flags(req, "MMC bad request");
		return BLKPREP_KILL;
	}

	req->cmd_flags |= REQ_DONTPREP;

	return BLKPREP_OK;
}

static int mmc_queue_thread(void *d)
{
	struct mmc_queue *mq = d;
	struct request_queue *q = mq->queue;

	current->flags |= PF_MEMALLOC;

	down(&mq->thread_sem);
	do {
		struct request *req = NULL;

		spin_lock_irq(q->queue_lock);
		set_current_state(TASK_INTERRUPTIBLE);
		if (!blk_queue_plugged(q))
			req = blk_fetch_request(q);
		mq->req = req;
		spin_unlock_irq(q->queue_lock);

		if (!req) {
			if (kthread_should_stop()) {
				set_current_state(TASK_RUNNING);
				break;
			}
			up(&mq->thread_sem);
			schedule();
			down(&mq->thread_sem);
			continue;
		}
		set_current_state(TASK_RUNNING);

		mq->issue_fn(mq, req);
	} while (1);
	up(&mq->thread_sem);

	return 0;
}

/*
 * Generic MMC request handler.  This is called for any queue on a
 * particular host.  When the host is not busy, we look for a request
 * on any queue on this host, and attempt to issue it.  This may
 * not be the queue we were asked to process.
 */
static void mmc_request(struct request_queue *q)
{
	struct mmc_queue *mq = q->queuedata;
	struct request *req;

	if (!mq) {
		while ((req = blk_fetch_request(q)) != NULL) {
			req->cmd_flags |= REQ_QUIET;
			__blk_end_request_all(req, -EIO);
		}
		return;
	}

	if (!mq->req)
		wake_up_process(mq->thread);
}

/**
 * mmc_init_queue - initialise a queue structure.
 * @mq: mmc queue
 * @card: mmc card to attach this queue
 * @lock: queue lock
 *
 * Initialise a MMC card request queue.
 */
int mmc_init_queue(struct mmc_queue *mq, struct mmc_card *card, spinlock_t *lock)
{
	struct mmc_host *host = card->host;
	u64 limit = BLK_BOUNCE_HIGH;
	int ret;

	if (mmc_dev(host)->dma_mask && *mmc_dev(host)->dma_mask)
		limit = *mmc_dev(host)->dma_mask;

	mq->card = card;
	mq->queue = blk_init_queue(mmc_request, lock);
	if (!mq->queue)
		return -ENOMEM;

	mq->queue->queuedata = mq;
	mq->req = NULL;

	blk_queue_prep_rq(mq->queue, mmc_prep_request);
	blk_queue_ordered(mq->queue, QUEUE_ORDERED_DRAIN, NULL);
	queue_flag_set_unlocked(QUEUE_FLAG_NONROT, mq->queue);

#ifdef CONFIG_MMC_BLOCK_BOUNCE
	if (host->max_hw_segs == 1) {
		unsigned int bouncesz;

		bouncesz = MMC_QUEUE_BOUNCESZ;

		if (bouncesz > host->max_req_size)
			bouncesz = host->max_req_size;
		if (bouncesz > host->max_seg_size)
			bouncesz = host->max_seg_size;
		if (bouncesz > (host->max_blk_count * 512))
			bouncesz = host->max_blk_count * 512;

		if (bouncesz > 512) {
			mq->bounce_buf = kmalloc(bouncesz, GFP_KERNEL);
			if (!mq->bounce_buf) {
				printk(KERN_WARNING "%s: unable to "
					"allocate bounce buffer\n",
					mmc_card_name(card));
			}
		}

		if (mq->bounce_buf) {
			blk_queue_bounce_limit(mq->queue, BLK_BOUNCE_ANY);
			blk_queue_max_hw_sectors(mq->queue, bouncesz / 512);
			blk_queue_max_segments(mq->queue, bouncesz / 512);
			blk_queue_max_segment_size(mq->queue, bouncesz);

			mq->sg = kmalloc(sizeof(struct scatterlist),
				GFP_KERNEL);
			if (!mq->sg) {
				ret = -ENOMEM;
				goto cleanup_queue;
			}
			sg_init_table(mq->sg, 1);

			mq->bounce_sg = kmalloc(sizeof(struct scatterlist) *
				bouncesz / 512, GFP_KERNEL);
			if (!mq->bounce_sg) {
				ret = -ENOMEM;
				goto cleanup_queue;
			}
			sg_init_table(mq->bounce_sg, bouncesz / 512);
		}
	}
#endif

	if (!mq->bounce_buf) {
		blk_queue_bounce_limit(mq->queue, limit);
		blk_queue_max_hw_sectors(mq->queue,
			min(host->max_blk_count, host->max_req_size / 512));
		blk_queue_max_segments(mq->queue, host->max_hw_segs);
		blk_queue_max_segment_size(mq->queue, host->max_seg_size);

		mq->sg = kmalloc(sizeof(struct scatterlist) *
			host->max_phys_segs, GFP_KERNEL);
		if (!mq->sg) {
			ret = -ENOMEM;
			goto cleanup_queue;
		}
		sg_init_table(mq->sg, host->max_phys_segs);
	}

	init_MUTEX(&mq->thread_sem);

	mq->thread = kthread_run(mmc_queue_thread, mq, "mmcqd");
	if (IS_ERR(mq->thread)) {
		ret = PTR_ERR(mq->thread);
		goto free_bounce_sg;
	}

	return 0;
 free_bounce_sg:
 	if (mq->bounce_sg)
 		kfree(mq->bounce_sg);
 	mq->bounce_sg = NULL;
 cleanup_queue:
 	if (mq->sg)
		kfree(mq->sg);
	mq->sg = NULL;
	if (mq->bounce_buf)
		kfree(mq->bounce_buf);
	mq->bounce_buf = NULL;
	blk_cleanup_queue(mq->queue);
	return ret;
}

void mmc_cleanup_queue(struct mmc_queue *mq)
{
	struct request_queue *q = mq->queue;
	unsigned long flags;

	/* Make sure the queue isn't suspended, as that will deadlock */
	mmc_queue_resume(mq);

	/* Then terminate our worker thread */
	kthread_stop(mq->thread);

	/* Empty the queue */
	spin_lock_irqsave(q->queue_lock, flags);
	q->queuedata = NULL;
	blk_start_queue(q);
	spin_unlock_irqrestore(q->queue_lock, flags);

 	if (mq->bounce_sg)
 		kfree(mq->bounce_sg);
 	mq->bounce_sg = NULL;

	kfree(mq->sg);
	mq->sg = NULL;

	if (mq->bounce_buf)
		kfree(mq->bounce_buf);
	mq->bounce_buf = NULL;

	mq->card = NULL;
}
EXPORT_SYMBOL(mmc_cleanup_queue);

/**
 * mmc_queue_suspend - suspend a MMC request queue
 * @mq: MMC queue to suspend
 *
 * Stop the block request queue, and wait for our thread to
 * complete any outstanding requests.  This ensures that we
 * won't suspend while a request is being processed.
 */
void mmc_queue_suspend(struct mmc_queue *mq)
{
	struct request_queue *q = mq->queue;
	unsigned long flags;

	if (!(mq->flags & MMC_QUEUE_SUSPENDED)) {
		mq->flags |= MMC_QUEUE_SUSPENDED;

		spin_lock_irqsave(q->queue_lock, flags);
		blk_stop_queue(q);
		spin_unlock_irqrestore(q->queue_lock, flags);

		down(&mq->thread_sem);
	}
}

/**
 * mmc_queue_resume - resume a previously suspended MMC request queue
 * @mq: MMC queue to resume
 */
void mmc_queue_resume(struct mmc_queue *mq)
{
	struct request_queue *q = mq->queue;
	unsigned long flags;

	if (mq->flags & MMC_QUEUE_SUSPENDED) {
		mq->flags &= ~MMC_QUEUE_SUSPENDED;

		up(&mq->thread_sem);

		spin_lock_irqsave(q->queue_lock, flags);
		blk_start_queue(q);
		spin_unlock_irqrestore(q->queue_lock, flags);
	}
}

/*
 * Prepare the sg list(s) to be handed of to the host driver
 */
unsigned int mmc_queue_map_sg(struct mmc_queue *mq)
{
	unsigned int sg_len;
	size_t buflen;
	struct scatterlist *sg;
	int i;

	if (!mq->bounce_buf)
		return blk_rq_map_sg(mq->queue, mq->req, mq->sg);

	BUG_ON(!mq->bounce_sg);

	sg_len = blk_rq_map_sg(mq->queue, mq->req, mq->bounce_sg);

	mq->bounce_sg_len = sg_len;

	buflen = 0;
	for_each_sg(mq->bounce_sg, sg, sg_len, i)
		buflen += sg->length;

	sg_init_one(mq->sg, mq->bounce_buf, buflen);

	return 1;
}

/*
 * If writing, bounce the data to the buffer before the request
 * is sent to the host driver
 */
void mmc_queue_bounce_pre(struct mmc_queue *mq)
{
	unsigned long flags;

	if (!mq->bounce_buf)
		return;

	if (rq_data_dir(mq->req) != WRITE)
		return;

	local_irq_save(flags);
	sg_copy_to_buffer(mq->bounce_sg, mq->bounce_sg_len,
		mq->bounce_buf, mq->sg[0].length);
	local_irq_restore(flags);
}

/*
 * If reading, bounce the data from the buffer after the request
 * has been handled by the host driver
 */
void mmc_queue_bounce_post(struct mmc_queue *mq)
{
	unsigned long flags;

	if (!mq->bounce_buf)
		return;

	if (rq_data_dir(mq->req) != READ)
		return;

	local_irq_save(flags);
	sg_copy_from_buffer(mq->bounce_sg, mq->bounce_sg_len,
		mq->bounce_buf, mq->sg[0].length);
	local_irq_restore(flags);
}
Commit	Line	Data
1da177e4	1	/*
70f10482	2	* linux/drivers/mmc/card/queue.c
1da177e4 LT	3	*
1da177e4 LT	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>
1da177e4 LT	14	#include <linux/blkdev.h>
83144186	15	#include <linux/freezer.h>
87598a2b	16	#include <linux/kthread.h>
45711f1a	17	#include <linux/scatterlist.h>
1da177e4 LT	18
	19	#include <linux/mmc/card.h>
	20	#include <linux/mmc/host.h>
98ac2162	21	#include "queue.h"
1da177e4	22
98ccf149 PO	23	#define MMC_QUEUE_BOUNCESZ 65536
98ccf149 PO	24
87598a2b	25	#define MMC_QUEUE_SUSPENDED (1 << 0)
1da177e4 LT	26
1da177e4 LT	27	/*
9c9f2d63	28	* Prepare a MMC request. This just filters out odd stuff.
1da177e4 LT	29	*/
	30	static int mmc_prep_request(struct request_queue q, struct request req)
	31	{
9c9f2d63 PO	32	/*
	33	* We only like normal block requests.
	34	*/
d6d8de33	35	if (!blk_fs_request(req)) {
1da177e4	36	blk_dump_rq_flags(req, "MMC bad request");
9c9f2d63	37	return BLKPREP_KILL;
1da177e4 LT	38	}
1da177e4 LT	39
9c9f2d63	40	req->cmd_flags \|= REQ_DONTPREP;
1da177e4	41
9c9f2d63	42	return BLKPREP_OK;
1da177e4 LT	43	}
	44
	45	static int mmc_queue_thread(void *d)
	46	{
	47	struct mmc_queue *mq = d;
	48	struct request_queue *q = mq->queue;
1da177e4	49
83144186	50	current->flags \|= PF_MEMALLOC;
1da177e4	51
1da177e4	52	down(&mq->thread_sem);
1da177e4 LT	53	do {
	54	struct request *req = NULL;
	55
	56	spin_lock_irq(q->queue_lock);
	57	set_current_state(TASK_INTERRUPTIBLE);
9934c8c0 TH	58	if (!blk_queue_plugged(q))
9934c8c0 TH	59	req = blk_fetch_request(q);
c723e08a	60	mq->req = req;
1da177e4 LT	61	spin_unlock_irq(q->queue_lock);
	62
	63	if (!req) {
7b30d281 VW	64	if (kthread_should_stop()) {
7b30d281 VW	65	set_current_state(TASK_RUNNING);
1da177e4	66	break;
7b30d281	67	}
1da177e4 LT	68	up(&mq->thread_sem);
	69	schedule();
	70	down(&mq->thread_sem);
	71	continue;
	72	}
	73	set_current_state(TASK_RUNNING);
	74
	75	mq->issue_fn(mq, req);
	76	} while (1);
1da177e4 LT	77	up(&mq->thread_sem);
1da177e4 LT	78
1da177e4 LT	79	return 0;
	80	}
	81
	82	/*
	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.
	87	*/
165125e1	88	static void mmc_request(struct request_queue *q)
1da177e4 LT	89	{
1da177e4 LT	90	struct mmc_queue *mq = q->queuedata;
89b4e133	91	struct request *req;
89b4e133 PO	92
89b4e133 PO	93	if (!mq) {
5fa83ce2 AH	94	while ((req = blk_fetch_request(q)) != NULL) {
5fa83ce2 AH	95	req->cmd_flags \|= REQ_QUIET;
296b2f6a	96	__blk_end_request_all(req, -EIO);
5fa83ce2	97	}
89b4e133 PO	98	return;
89b4e133 PO	99	}
1da177e4 LT	100
1da177e4 LT	101	if (!mq->req)
87598a2b	102	wake_up_process(mq->thread);
1da177e4 LT	103	}
	104
	105	/**
	106	* mmc_init_queue - initialise a queue structure.
	107	* @mq: mmc queue
	108	* @card: mmc card to attach this queue
	109	* @lock: queue lock
	110	*
	111	* Initialise a MMC card request queue.
	112	*/
	113	int mmc_init_queue(struct mmc_queue mq, struct mmc_card card, spinlock_t *lock)
	114	{
	115	struct mmc_host *host = card->host;
	116	u64 limit = BLK_BOUNCE_HIGH;
	117	int ret;
	118
fcaf71fd GKH	119	if (mmc_dev(host)->dma_mask && *mmc_dev(host)->dma_mask)
fcaf71fd GKH	120	limit = *mmc_dev(host)->dma_mask;
1da177e4 LT	121
	122	mq->card = card;
	123	mq->queue = blk_init_queue(mmc_request, lock);
	124	if (!mq->queue)
	125	return -ENOMEM;
	126
1da177e4 LT	127	mq->queue->queuedata = mq;
	128	mq->req = NULL;
	129
98ccf149	130	blk_queue_prep_rq(mq->queue, mmc_prep_request);
91028954	131	blk_queue_ordered(mq->queue, QUEUE_ORDERED_DRAIN, NULL);
8dddfe19	132	queue_flag_set_unlocked(QUEUE_FLAG_NONROT, mq->queue);
98ccf149 PO	133
	134	#ifdef CONFIG_MMC_BLOCK_BOUNCE
	135	if (host->max_hw_segs == 1) {
aafabfab PO	136	unsigned int bouncesz;
aafabfab PO	137
98ccf149 PO	138	bouncesz = MMC_QUEUE_BOUNCESZ;
	139
	140	if (bouncesz > host->max_req_size)
	141	bouncesz = host->max_req_size;
	142	if (bouncesz > host->max_seg_size)
	143	bouncesz = host->max_seg_size;
f3eb0aaa PO	144	if (bouncesz > (host->max_blk_count * 512))
	145	bouncesz = host->max_blk_count * 512;
	146
	147	if (bouncesz > 512) {
	148	mq->bounce_buf = kmalloc(bouncesz, GFP_KERNEL);
	149	if (!mq->bounce_buf) {
	150	printk(KERN_WARNING "%s: unable to "
	151	"allocate bounce buffer\n",
	152	mmc_card_name(card));
	153	}
	154	}
98ccf149	155
f3eb0aaa	156	if (mq->bounce_buf) {
2ff1fa67	157	blk_queue_bounce_limit(mq->queue, BLK_BOUNCE_ANY);
086fa5ff	158	blk_queue_max_hw_sectors(mq->queue, bouncesz / 512);
8a78362c	159	blk_queue_max_segments(mq->queue, bouncesz / 512);
98ccf149 PO	160	blk_queue_max_segment_size(mq->queue, bouncesz);
98ccf149 PO	161
45711f1a	162	mq->sg = kmalloc(sizeof(struct scatterlist),
98ccf149 PO	163	GFP_KERNEL);
	164	if (!mq->sg) {
	165	ret = -ENOMEM;
aafabfab	166	goto cleanup_queue;
98ccf149	167	}
45711f1a	168	sg_init_table(mq->sg, 1);
98ccf149	169
45711f1a	170	mq->bounce_sg = kmalloc(sizeof(struct scatterlist) *
98ccf149 PO	171	bouncesz / 512, GFP_KERNEL);
	172	if (!mq->bounce_sg) {
	173	ret = -ENOMEM;
aafabfab	174	goto cleanup_queue;
98ccf149	175	}
45711f1a	176	sg_init_table(mq->bounce_sg, bouncesz / 512);
98ccf149 PO	177	}
	178	}
	179	#endif
	180
	181	if (!mq->bounce_buf) {
	182	blk_queue_bounce_limit(mq->queue, limit);
086fa5ff	183	blk_queue_max_hw_sectors(mq->queue,
f3eb0aaa	184	min(host->max_blk_count, host->max_req_size / 512));
8a78362c	185	blk_queue_max_segments(mq->queue, host->max_hw_segs);
98ccf149 PO	186	blk_queue_max_segment_size(mq->queue, host->max_seg_size);
98ccf149 PO	187
05e5b136	188	mq->sg = kmalloc(sizeof(struct scatterlist) *
98ccf149 PO	189	host->max_phys_segs, GFP_KERNEL);
	190	if (!mq->sg) {
	191	ret = -ENOMEM;
	192	goto cleanup_queue;
	193	}
05e5b136	194	sg_init_table(mq->sg, host->max_phys_segs);
1da177e4 LT	195	}
1da177e4 LT	196
1da177e4 LT	197	init_MUTEX(&mq->thread_sem);
1da177e4 LT	198
87598a2b CH	199	mq->thread = kthread_run(mmc_queue_thread, mq, "mmcqd");
	200	if (IS_ERR(mq->thread)) {
	201	ret = PTR_ERR(mq->thread);
98ccf149	202	goto free_bounce_sg;
1da177e4 LT	203	}
1da177e4 LT	204
87598a2b	205	return 0;
98ccf149 PO	206	free_bounce_sg:
	207	if (mq->bounce_sg)
	208	kfree(mq->bounce_sg);
	209	mq->bounce_sg = NULL;
aafabfab PO	210	cleanup_queue:
	211	if (mq->sg)
	212	kfree(mq->sg);
1da177e4	213	mq->sg = NULL;
98ccf149 PO	214	if (mq->bounce_buf)
	215	kfree(mq->bounce_buf);
	216	mq->bounce_buf = NULL;
1da177e4	217	blk_cleanup_queue(mq->queue);
1da177e4 LT	218	return ret;
1da177e4 LT	219	}
1da177e4 LT	220
	221	void mmc_cleanup_queue(struct mmc_queue *mq)
	222	{
165125e1	223	struct request_queue *q = mq->queue;
89b4e133 PO	224	unsigned long flags;
89b4e133 PO	225
d2b46f66 PO	226	/* Make sure the queue isn't suspended, as that will deadlock */
	227	mmc_queue_resume(mq);
	228
89b4e133	229	/* Then terminate our worker thread */
87598a2b	230	kthread_stop(mq->thread);
1da177e4	231
5fa83ce2 AH	232	/* Empty the queue */
	233	spin_lock_irqsave(q->queue_lock, flags);
	234	q->queuedata = NULL;
	235	blk_start_queue(q);
	236	spin_unlock_irqrestore(q->queue_lock, flags);
	237
98ccf149 PO	238	if (mq->bounce_sg)
	239	kfree(mq->bounce_sg);
	240	mq->bounce_sg = NULL;
	241
1da177e4 LT	242	kfree(mq->sg);
	243	mq->sg = NULL;
	244
98ccf149 PO	245	if (mq->bounce_buf)
	246	kfree(mq->bounce_buf);
	247	mq->bounce_buf = NULL;
	248
1da177e4 LT	249	mq->card = NULL;
	250	}
	251	EXPORT_SYMBOL(mmc_cleanup_queue);
	252
	253	/**
	254	* mmc_queue_suspend - suspend a MMC request queue
	255	* @mq: MMC queue to suspend
	256	*
	257	* Stop the block request queue, and wait for our thread to
	258	* complete any outstanding requests. This ensures that we
	259	* won't suspend while a request is being processed.
	260	*/
	261	void mmc_queue_suspend(struct mmc_queue *mq)
	262	{
165125e1	263	struct request_queue *q = mq->queue;
1da177e4 LT	264	unsigned long flags;
	265
	266	if (!(mq->flags & MMC_QUEUE_SUSPENDED)) {
	267	mq->flags \|= MMC_QUEUE_SUSPENDED;
	268
	269	spin_lock_irqsave(q->queue_lock, flags);
	270	blk_stop_queue(q);
	271	spin_unlock_irqrestore(q->queue_lock, flags);
	272
	273	down(&mq->thread_sem);
	274	}
	275	}
1da177e4 LT	276
	277	/**
	278	* mmc_queue_resume - resume a previously suspended MMC request queue
	279	* @mq: MMC queue to resume
	280	*/
	281	void mmc_queue_resume(struct mmc_queue *mq)
	282	{
165125e1	283	struct request_queue *q = mq->queue;
1da177e4 LT	284	unsigned long flags;
	285
	286	if (mq->flags & MMC_QUEUE_SUSPENDED) {
	287	mq->flags &= ~MMC_QUEUE_SUSPENDED;
	288
	289	up(&mq->thread_sem);
	290
	291	spin_lock_irqsave(q->queue_lock, flags);
	292	blk_start_queue(q);
	293	spin_unlock_irqrestore(q->queue_lock, flags);
	294	}
	295	}
98ac2162	296
2ff1fa67 PO	297	/*
	298	* Prepare the sg list(s) to be handed of to the host driver
	299	*/
98ccf149 PO	300	unsigned int mmc_queue_map_sg(struct mmc_queue *mq)
	301	{
	302	unsigned int sg_len;
2ff1fa67 PO	303	size_t buflen;
	304	struct scatterlist *sg;
	305	int i;
98ccf149 PO	306
	307	if (!mq->bounce_buf)
	308	return blk_rq_map_sg(mq->queue, mq->req, mq->sg);
	309
	310	BUG_ON(!mq->bounce_sg);
	311
	312	sg_len = blk_rq_map_sg(mq->queue, mq->req, mq->bounce_sg);
	313
	314	mq->bounce_sg_len = sg_len;
	315
2ff1fa67 PO	316	buflen = 0;
	317	for_each_sg(mq->bounce_sg, sg, sg_len, i)
	318	buflen += sg->length;
98ccf149	319
2ff1fa67	320	sg_init_one(mq->sg, mq->bounce_buf, buflen);
98ccf149 PO	321
	322	return 1;
	323	}
	324
2ff1fa67 PO	325	/*
	326	* If writing, bounce the data to the buffer before the request
	327	* is sent to the host driver
	328	*/
98ccf149 PO	329	void mmc_queue_bounce_pre(struct mmc_queue *mq)
98ccf149 PO	330	{
2ff1fa67 PO	331	unsigned long flags;
2ff1fa67 PO	332
98ccf149 PO	333	if (!mq->bounce_buf)
	334	return;
	335
98ccf149 PO	336	if (rq_data_dir(mq->req) != WRITE)
	337	return;
	338
2ff1fa67 PO	339	local_irq_save(flags);
	340	sg_copy_to_buffer(mq->bounce_sg, mq->bounce_sg_len,
	341	mq->bounce_buf, mq->sg[0].length);
	342	local_irq_restore(flags);
98ccf149 PO	343	}
98ccf149 PO	344
2ff1fa67 PO	345	/*
	346	* If reading, bounce the data from the buffer after the request
	347	* has been handled by the host driver
	348	*/
98ccf149 PO	349	void mmc_queue_bounce_post(struct mmc_queue *mq)
98ccf149 PO	350	{
2ff1fa67 PO	351	unsigned long flags;
2ff1fa67 PO	352
98ccf149 PO	353	if (!mq->bounce_buf)
	354	return;
	355
98ccf149 PO	356	if (rq_data_dir(mq->req) != READ)
	357	return;
	358
2ff1fa67 PO	359	local_irq_save(flags);
	360	sg_copy_from_buffer(mq->bounce_sg, mq->bounce_sg_len,
	361	mq->bounce_buf, mq->sg[0].length);
	362	local_irq_restore(flags);
98ccf149 PO	363	}
98ccf149 PO	364