[GitHub/mt8127/android_kernel_alcatel_ttab.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/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) {
		printk(KERN_ERR "MMC: killing requests for dead queue\n");
		while ((req = blk_fetch_request(q)) != NULL)
			__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_sectors(mq->queue, bouncesz / 512);
			blk_queue_max_phys_segments(mq->queue, bouncesz / 512);
			blk_queue_max_hw_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_sectors(mq->queue,
			min(host->max_blk_count, host->max_req_size / 512));
		blk_queue_max_phys_segments(mq->queue, host->max_phys_segs);
		blk_queue_max_hw_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;

	/* Mark that we should start throwing out stragglers */
	spin_lock_irqsave(q->queue_lock, flags);
	q->queuedata = NULL;
	spin_unlock_irqrestore(q->queue_lock, 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);

 	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;

	blk_cleanup_queue(mq->queue);

	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	*/
	12	#include <linux/module.h>
	13	#include <linux/blkdev.h>
83144186	14	#include <linux/freezer.h>
87598a2b	15	#include <linux/kthread.h>
45711f1a	16	#include <linux/scatterlist.h>
1da177e4 LT	17
	18	#include <linux/mmc/card.h>
	19	#include <linux/mmc/host.h>
98ac2162	20	#include "queue.h"
1da177e4	21
98ccf149 PO	22	#define MMC_QUEUE_BOUNCESZ 65536
98ccf149 PO	23
87598a2b	24	#define MMC_QUEUE_SUSPENDED (1 << 0)
1da177e4 LT	25
1da177e4 LT	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	{
9c9f2d63 PO	31	/*
	32	* We only like normal block requests.
	33	*/
d6d8de33	34	if (!blk_fs_request(req)) {
1da177e4	35	blk_dump_rq_flags(req, "MMC bad request");
9c9f2d63	36	return BLKPREP_KILL;
1da177e4 LT	37	}
1da177e4 LT	38
9c9f2d63	39	req->cmd_flags \|= REQ_DONTPREP;
1da177e4	40
9c9f2d63	41	return BLKPREP_OK;
1da177e4 LT	42	}
	43
	44	static int mmc_queue_thread(void *d)
	45	{
	46	struct mmc_queue *mq = d;
	47	struct request_queue *q = mq->queue;
1da177e4	48
83144186	49	current->flags \|= PF_MEMALLOC;
1da177e4	50
1da177e4	51	down(&mq->thread_sem);
1da177e4 LT	52	do {
	53	struct request *req = NULL;
	54
	55	spin_lock_irq(q->queue_lock);
	56	set_current_state(TASK_INTERRUPTIBLE);
9934c8c0 TH	57	if (!blk_queue_plugged(q))
9934c8c0 TH	58	req = blk_fetch_request(q);
c723e08a	59	mq->req = req;
1da177e4 LT	60	spin_unlock_irq(q->queue_lock);
	61
	62	if (!req) {
7b30d281 VW	63	if (kthread_should_stop()) {
7b30d281 VW	64	set_current_state(TASK_RUNNING);
1da177e4	65	break;
7b30d281	66	}
1da177e4 LT	67	up(&mq->thread_sem);
	68	schedule();
	69	down(&mq->thread_sem);
	70	continue;
	71	}
	72	set_current_state(TASK_RUNNING);
	73
	74	mq->issue_fn(mq, req);
	75	} while (1);
1da177e4 LT	76	up(&mq->thread_sem);
1da177e4 LT	77
1da177e4 LT	78	return 0;
	79	}
	80
	81	/*
	82	* Generic MMC request handler. This is called for any queue on a
	83	* particular host. When the host is not busy, we look for a request
	84	* on any queue on this host, and attempt to issue it. This may
	85	* not be the queue we were asked to process.
	86	*/
165125e1	87	static void mmc_request(struct request_queue *q)
1da177e4 LT	88	{
1da177e4 LT	89	struct mmc_queue *mq = q->queuedata;
89b4e133	90	struct request *req;
89b4e133 PO	91
	92	if (!mq) {
	93	printk(KERN_ERR "MMC: killing requests for dead queue\n");
9934c8c0	94	while ((req = blk_fetch_request(q)) != NULL)
296b2f6a	95	__blk_end_request_all(req, -EIO);
89b4e133 PO	96	return;
89b4e133 PO	97	}
1da177e4 LT	98
1da177e4 LT	99	if (!mq->req)
87598a2b	100	wake_up_process(mq->thread);
1da177e4 LT	101	}
	102
	103	/**
	104	* mmc_init_queue - initialise a queue structure.
	105	* @mq: mmc queue
	106	* @card: mmc card to attach this queue
	107	* @lock: queue lock
	108	*
	109	* Initialise a MMC card request queue.
	110	*/
	111	int mmc_init_queue(struct mmc_queue mq, struct mmc_card card, spinlock_t *lock)
	112	{
	113	struct mmc_host *host = card->host;
	114	u64 limit = BLK_BOUNCE_HIGH;
	115	int ret;
	116
fcaf71fd GKH	117	if (mmc_dev(host)->dma_mask && *mmc_dev(host)->dma_mask)
fcaf71fd GKH	118	limit = *mmc_dev(host)->dma_mask;
1da177e4 LT	119
	120	mq->card = card;
	121	mq->queue = blk_init_queue(mmc_request, lock);
	122	if (!mq->queue)
	123	return -ENOMEM;
	124
1da177e4 LT	125	mq->queue->queuedata = mq;
	126	mq->req = NULL;
	127
98ccf149	128	blk_queue_prep_rq(mq->queue, mmc_prep_request);
91028954	129	blk_queue_ordered(mq->queue, QUEUE_ORDERED_DRAIN, NULL);
8dddfe19	130	queue_flag_set_unlocked(QUEUE_FLAG_NONROT, mq->queue);
98ccf149 PO	131
	132	#ifdef CONFIG_MMC_BLOCK_BOUNCE
	133	if (host->max_hw_segs == 1) {
aafabfab PO	134	unsigned int bouncesz;
aafabfab PO	135
98ccf149 PO	136	bouncesz = MMC_QUEUE_BOUNCESZ;
	137
	138	if (bouncesz > host->max_req_size)
	139	bouncesz = host->max_req_size;
	140	if (bouncesz > host->max_seg_size)
	141	bouncesz = host->max_seg_size;
f3eb0aaa PO	142	if (bouncesz > (host->max_blk_count * 512))
	143	bouncesz = host->max_blk_count * 512;
	144
	145	if (bouncesz > 512) {
	146	mq->bounce_buf = kmalloc(bouncesz, GFP_KERNEL);
	147	if (!mq->bounce_buf) {
	148	printk(KERN_WARNING "%s: unable to "
	149	"allocate bounce buffer\n",
	150	mmc_card_name(card));
	151	}
	152	}
98ccf149	153
f3eb0aaa	154	if (mq->bounce_buf) {
2ff1fa67	155	blk_queue_bounce_limit(mq->queue, BLK_BOUNCE_ANY);
98ccf149 PO	156	blk_queue_max_sectors(mq->queue, bouncesz / 512);
	157	blk_queue_max_phys_segments(mq->queue, bouncesz / 512);
	158	blk_queue_max_hw_segments(mq->queue, bouncesz / 512);
	159	blk_queue_max_segment_size(mq->queue, bouncesz);
	160
45711f1a	161	mq->sg = kmalloc(sizeof(struct scatterlist),
98ccf149 PO	162	GFP_KERNEL);
	163	if (!mq->sg) {
	164	ret = -ENOMEM;
aafabfab	165	goto cleanup_queue;
98ccf149	166	}
45711f1a	167	sg_init_table(mq->sg, 1);
98ccf149	168
45711f1a	169	mq->bounce_sg = kmalloc(sizeof(struct scatterlist) *
98ccf149 PO	170	bouncesz / 512, GFP_KERNEL);
	171	if (!mq->bounce_sg) {
	172	ret = -ENOMEM;
aafabfab	173	goto cleanup_queue;
98ccf149	174	}
45711f1a	175	sg_init_table(mq->bounce_sg, bouncesz / 512);
98ccf149 PO	176	}
	177	}
	178	#endif
	179
	180	if (!mq->bounce_buf) {
	181	blk_queue_bounce_limit(mq->queue, limit);
f3eb0aaa PO	182	blk_queue_max_sectors(mq->queue,
f3eb0aaa PO	183	min(host->max_blk_count, host->max_req_size / 512));
98ccf149 PO	184	blk_queue_max_phys_segments(mq->queue, host->max_phys_segs);
	185	blk_queue_max_hw_segments(mq->queue, host->max_hw_segs);
	186	blk_queue_max_segment_size(mq->queue, host->max_seg_size);
	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;
	225
	226	/* Mark that we should start throwing out stragglers */
	227	spin_lock_irqsave(q->queue_lock, flags);
	228	q->queuedata = NULL;
	229	spin_unlock_irqrestore(q->queue_lock, flags);
	230
d2b46f66 PO	231	/* Make sure the queue isn't suspended, as that will deadlock */
	232	mmc_queue_resume(mq);
	233
89b4e133	234	/* Then terminate our worker thread */
87598a2b	235	kthread_stop(mq->thread);
1da177e4	236
98ccf149 PO	237	if (mq->bounce_sg)
	238	kfree(mq->bounce_sg);
	239	mq->bounce_sg = NULL;
	240
1da177e4 LT	241	kfree(mq->sg);
	242	mq->sg = NULL;
	243
98ccf149 PO	244	if (mq->bounce_buf)
	245	kfree(mq->bounce_buf);
	246	mq->bounce_buf = NULL;
	247
1da177e4 LT	248	blk_cleanup_queue(mq->queue);
	249
	250	mq->card = NULL;
	251	}
	252	EXPORT_SYMBOL(mmc_cleanup_queue);
	253
	254	/**
	255	* mmc_queue_suspend - suspend a MMC request queue
	256	* @mq: MMC queue to suspend
	257	*
	258	* Stop the block request queue, and wait for our thread to
	259	* complete any outstanding requests. This ensures that we
	260	* won't suspend while a request is being processed.
	261	*/
	262	void mmc_queue_suspend(struct mmc_queue *mq)
	263	{
165125e1	264	struct request_queue *q = mq->queue;
1da177e4 LT	265	unsigned long flags;
	266
	267	if (!(mq->flags & MMC_QUEUE_SUSPENDED)) {
	268	mq->flags \|= MMC_QUEUE_SUSPENDED;
	269
	270	spin_lock_irqsave(q->queue_lock, flags);
	271	blk_stop_queue(q);
	272	spin_unlock_irqrestore(q->queue_lock, flags);
	273
	274	down(&mq->thread_sem);
	275	}
	276	}
1da177e4 LT	277
	278	/**
	279	* mmc_queue_resume - resume a previously suspended MMC request queue
	280	* @mq: MMC queue to resume
	281	*/
	282	void mmc_queue_resume(struct mmc_queue *mq)
	283	{
165125e1	284	struct request_queue *q = mq->queue;
1da177e4 LT	285	unsigned long flags;
	286
	287	if (mq->flags & MMC_QUEUE_SUSPENDED) {
	288	mq->flags &= ~MMC_QUEUE_SUSPENDED;
	289
	290	up(&mq->thread_sem);
	291
	292	spin_lock_irqsave(q->queue_lock, flags);
	293	blk_start_queue(q);
	294	spin_unlock_irqrestore(q->queue_lock, flags);
	295	}
	296	}
98ac2162	297
2ff1fa67 PO	298	/*
	299	* Prepare the sg list(s) to be handed of to the host driver
	300	*/
98ccf149 PO	301	unsigned int mmc_queue_map_sg(struct mmc_queue *mq)
	302	{
	303	unsigned int sg_len;
2ff1fa67 PO	304	size_t buflen;
	305	struct scatterlist *sg;
	306	int i;
98ccf149 PO	307
	308	if (!mq->bounce_buf)
	309	return blk_rq_map_sg(mq->queue, mq->req, mq->sg);
	310
	311	BUG_ON(!mq->bounce_sg);
	312
	313	sg_len = blk_rq_map_sg(mq->queue, mq->req, mq->bounce_sg);
	314
	315	mq->bounce_sg_len = sg_len;
	316
2ff1fa67 PO	317	buflen = 0;
	318	for_each_sg(mq->bounce_sg, sg, sg_len, i)
	319	buflen += sg->length;
98ccf149	320
2ff1fa67	321	sg_init_one(mq->sg, mq->bounce_buf, buflen);
98ccf149 PO	322
	323	return 1;
	324	}
	325
2ff1fa67 PO	326	/*
	327	* If writing, bounce the data to the buffer before the request
	328	* is sent to the host driver
	329	*/
98ccf149 PO	330	void mmc_queue_bounce_pre(struct mmc_queue *mq)
98ccf149 PO	331	{
2ff1fa67 PO	332	unsigned long flags;
2ff1fa67 PO	333
98ccf149 PO	334	if (!mq->bounce_buf)
	335	return;
	336
98ccf149 PO	337	if (rq_data_dir(mq->req) != WRITE)
	338	return;
	339
2ff1fa67 PO	340	local_irq_save(flags);
	341	sg_copy_to_buffer(mq->bounce_sg, mq->bounce_sg_len,
	342	mq->bounce_buf, mq->sg[0].length);
	343	local_irq_restore(flags);
98ccf149 PO	344	}
98ccf149 PO	345
2ff1fa67 PO	346	/*
	347	* If reading, bounce the data from the buffer after the request
	348	* has been handled by the host driver
	349	*/
98ccf149 PO	350	void mmc_queue_bounce_post(struct mmc_queue *mq)
98ccf149 PO	351	{
2ff1fa67 PO	352	unsigned long flags;
2ff1fa67 PO	353
98ccf149 PO	354	if (!mq->bounce_buf)
	355	return;
	356
98ccf149 PO	357	if (rq_data_dir(mq->req) != READ)
	358	return;
	359
2ff1fa67 PO	360	local_irq_save(flags);
	361	sg_copy_from_buffer(mq->bounce_sg, mq->bounce_sg_len,
	362	mq->bounce_buf, mq->sg[0].length);
	363	local_irq_restore(flags);
98ccf149 PO	364	}
98ccf149 PO	365