[deliverable/linux.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 and discards.
	 */
	if (req->cmd_type != REQ_TYPE_FS && !(req->cmd_flags & REQ_DISCARD)) {
		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;
		struct mmc_queue_req *tmp;

		spin_lock_irq(q->queue_lock);
		set_current_state(TASK_INTERRUPTIBLE);
		req = blk_fetch_request(q);
		mq->mqrq_cur->req = req;
		spin_unlock_irq(q->queue_lock);

		if (req || mq->mqrq_prev->req) {
			set_current_state(TASK_RUNNING);
			mq->issue_fn(mq, req);
		} else {
			if (kthread_should_stop()) {
				set_current_state(TASK_RUNNING);
				break;
			}
			up(&mq->thread_sem);
			schedule();
			down(&mq->thread_sem);
		}

		/* Current request becomes previous request and vice versa. */
		mq->mqrq_prev->brq.mrq.data = NULL;
		mq->mqrq_prev->req = NULL;
		tmp = mq->mqrq_prev;
		mq->mqrq_prev = mq->mqrq_cur;
		mq->mqrq_cur = tmp;
	} 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->mqrq_cur->req && !mq->mqrq_prev->req)
		wake_up_process(mq->thread);
}

static struct scatterlist *mmc_alloc_sg(int sg_len, int *err)
{
	struct scatterlist *sg;

	sg = kmalloc(sizeof(struct scatterlist)*sg_len, GFP_KERNEL);
	if (!sg)
		*err = -ENOMEM;
	else {
		*err = 0;
		sg_init_table(sg, sg_len);
	}

	return sg;
}

static void mmc_queue_setup_discard(struct request_queue *q,
				    struct mmc_card *card)
{
	unsigned max_discard;

	max_discard = mmc_calc_max_discard(card);
	if (!max_discard)
		return;

	queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
	q->limits.max_discard_sectors = max_discard;
	if (card->erased_byte == 0)
		q->limits.discard_zeroes_data = 1;
	q->limits.discard_granularity = card->pref_erase << 9;
	/* granularity must not be greater than max. discard */
	if (card->pref_erase > max_discard)
		q->limits.discard_granularity = 0;
	if (mmc_can_secure_erase_trim(card))
		queue_flag_set_unlocked(QUEUE_FLAG_SECDISCARD, q);
}

/**
 * mmc_init_queue - initialise a queue structure.
 * @mq: mmc queue
 * @card: mmc card to attach this queue
 * @lock: queue lock
 * @subname: partition subname
 *
 * Initialise a MMC card request queue.
 */
int mmc_init_queue(struct mmc_queue *mq, struct mmc_card *card,
		   spinlock_t *lock, const char *subname)
{
	struct mmc_host *host = card->host;
	u64 limit = BLK_BOUNCE_HIGH;
	int ret;
	struct mmc_queue_req *mqrq_cur = &mq->mqrq[0];
	struct mmc_queue_req *mqrq_prev = &mq->mqrq[1];

	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;

	memset(&mq->mqrq_cur, 0, sizeof(mq->mqrq_cur));
	memset(&mq->mqrq_prev, 0, sizeof(mq->mqrq_prev));
	mq->mqrq_cur = mqrq_cur;
	mq->mqrq_prev = mqrq_prev;
	mq->queue->queuedata = mq;

	blk_queue_prep_rq(mq->queue, mmc_prep_request);
	queue_flag_set_unlocked(QUEUE_FLAG_NONROT, mq->queue);
	if (mmc_can_erase(card))
		mmc_queue_setup_discard(mq->queue, card);

#ifdef CONFIG_MMC_BLOCK_BOUNCE
	if (host->max_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) {
			mqrq_cur->bounce_buf = kmalloc(bouncesz, GFP_KERNEL);
			if (!mqrq_cur->bounce_buf) {
				pr_warning("%s: unable to "
					"allocate bounce cur buffer\n",
					mmc_card_name(card));
			}
			mqrq_prev->bounce_buf = kmalloc(bouncesz, GFP_KERNEL);
			if (!mqrq_prev->bounce_buf) {
				pr_warning("%s: unable to "
					"allocate bounce prev buffer\n",
					mmc_card_name(card));
				kfree(mqrq_cur->bounce_buf);
				mqrq_cur->bounce_buf = NULL;
			}
		}

		if (mqrq_cur->bounce_buf && mqrq_prev->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);

			mqrq_cur->sg = mmc_alloc_sg(1, &ret);
			if (ret)
				goto cleanup_queue;

			mqrq_cur->bounce_sg =
				mmc_alloc_sg(bouncesz / 512, &ret);
			if (ret)
				goto cleanup_queue;

			mqrq_prev->sg = mmc_alloc_sg(1, &ret);
			if (ret)
				goto cleanup_queue;

			mqrq_prev->bounce_sg =
				mmc_alloc_sg(bouncesz / 512, &ret);
			if (ret)
				goto cleanup_queue;
		}
	}
#endif

	if (!mqrq_cur->bounce_buf && !mqrq_prev->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_segs);
		blk_queue_max_segment_size(mq->queue, host->max_seg_size);

		mqrq_cur->sg = mmc_alloc_sg(host->max_segs, &ret);
		if (ret)
			goto cleanup_queue;


		mqrq_prev->sg = mmc_alloc_sg(host->max_segs, &ret);
		if (ret)
			goto cleanup_queue;
	}

	sema_init(&mq->thread_sem, 1);

	mq->thread = kthread_run(mmc_queue_thread, mq, "mmcqd/%d%s",
		host->index, subname ? subname : "");

	if (IS_ERR(mq->thread)) {
		ret = PTR_ERR(mq->thread);
		goto free_bounce_sg;
	}

	return 0;
 free_bounce_sg:
	kfree(mqrq_cur->bounce_sg);
	mqrq_cur->bounce_sg = NULL;
	kfree(mqrq_prev->bounce_sg);
	mqrq_prev->bounce_sg = NULL;

 cleanup_queue:
	kfree(mqrq_cur->sg);
	mqrq_cur->sg = NULL;
	kfree(mqrq_cur->bounce_buf);
	mqrq_cur->bounce_buf = NULL;

	kfree(mqrq_prev->sg);
	mqrq_prev->sg = NULL;
	kfree(mqrq_prev->bounce_buf);
	mqrq_prev->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;
	struct mmc_queue_req *mqrq_cur = mq->mqrq_cur;
	struct mmc_queue_req *mqrq_prev = mq->mqrq_prev;

	/* 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);

	kfree(mqrq_cur->bounce_sg);
	mqrq_cur->bounce_sg = NULL;

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

	kfree(mqrq_cur->bounce_buf);
	mqrq_cur->bounce_buf = NULL;

	kfree(mqrq_prev->bounce_sg);
	mqrq_prev->bounce_sg = NULL;

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

	kfree(mqrq_prev->bounce_buf);
	mqrq_prev->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, struct mmc_queue_req *mqrq)
{
	unsigned int sg_len;
	size_t buflen;
	struct scatterlist *sg;
	int i;

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

	BUG_ON(!mqrq->bounce_sg);

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

	mqrq->bounce_sg_len = sg_len;

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

	sg_init_one(mqrq->sg, mqrq->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_req *mqrq)
{
	if (!mqrq->bounce_buf)
		return;

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

	sg_copy_to_buffer(mqrq->bounce_sg, mqrq->bounce_sg_len,
		mqrq->bounce_buf, mqrq->sg[0].length);
}

/*
 * 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_req *mqrq)
{
	if (!mqrq->bounce_buf)
		return;

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

	sg_copy_from_buffer(mqrq->bounce_sg, mqrq->bounce_sg_len,
		mqrq->bounce_buf, mqrq->sg[0].length);
}
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	32	/*
bd788c96	33	* We only like normal block requests and discards.
9c9f2d63	34	*/
bd788c96	35	if (req->cmd_type != REQ_TYPE_FS && !(req->cmd_flags & REQ_DISCARD)) {
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 {
1da177e4 LT	54	struct request *req = NULL;
ee8a43a5	55	struct mmc_queue_req *tmp;
1da177e4 LT	56
	57	spin_lock_irq(q->queue_lock);
	58	set_current_state(TASK_INTERRUPTIBLE);
7eaceacc	59	req = blk_fetch_request(q);
97868a2b	60	mq->mqrq_cur->req = req;
1da177e4 LT	61	spin_unlock_irq(q->queue_lock);
1da177e4 LT	62
ee8a43a5 PF	63	if (req \|\| mq->mqrq_prev->req) {
	64	set_current_state(TASK_RUNNING);
	65	mq->issue_fn(mq, req);
	66	} else {
7b30d281 VW	67	if (kthread_should_stop()) {
7b30d281 VW	68	set_current_state(TASK_RUNNING);
1da177e4	69	break;
7b30d281	70	}
1da177e4 LT	71	up(&mq->thread_sem);
	72	schedule();
	73	down(&mq->thread_sem);
1da177e4	74	}
1da177e4	75
ee8a43a5 PF	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;
1da177e4	82	} while (1);
1da177e4 LT	83	up(&mq->thread_sem);
1da177e4 LT	84
1da177e4 LT	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	*/
165125e1	94	static void mmc_request(struct request_queue *q)
1da177e4 LT	95	{
1da177e4 LT	96	struct mmc_queue *mq = q->queuedata;
89b4e133	97	struct request *req;
89b4e133 PO	98
89b4e133 PO	99	if (!mq) {
5fa83ce2 AH	100	while ((req = blk_fetch_request(q)) != NULL) {
5fa83ce2 AH	101	req->cmd_flags \|= REQ_QUIET;
296b2f6a	102	__blk_end_request_all(req, -EIO);
5fa83ce2	103	}
89b4e133 PO	104	return;
89b4e133 PO	105	}
1da177e4	106
ee8a43a5	107	if (!mq->mqrq_cur->req && !mq->mqrq_prev->req)
87598a2b	108	wake_up_process(mq->thread);
1da177e4 LT	109	}
1da177e4 LT	110
7513cd7a	111	static struct scatterlist mmc_alloc_sg(int sg_len, int err)
97868a2b PF	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
e056a1b5 AH	126	static 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
1da177e4 LT	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
d09408ad	152	* @subname: partition subname
1da177e4 LT	153	*
	154	* Initialise a MMC card request queue.
	155	*/
d09408ad AH	156	int mmc_init_queue(struct mmc_queue mq, struct mmc_card card,
d09408ad AH	157	spinlock_t lock, const char subname)
1da177e4 LT	158	{
	159	struct mmc_host *host = card->host;
	160	u64 limit = BLK_BOUNCE_HIGH;
	161	int ret;
97868a2b	162	struct mmc_queue_req *mqrq_cur = &mq->mqrq[0];
04296b7b	163	struct mmc_queue_req *mqrq_prev = &mq->mqrq[1];
1da177e4	164
fcaf71fd GKH	165	if (mmc_dev(host)->dma_mask && *mmc_dev(host)->dma_mask)
fcaf71fd GKH	166	limit = *mmc_dev(host)->dma_mask;
1da177e4 LT	167
	168	mq->card = card;
	169	mq->queue = blk_init_queue(mmc_request, lock);
	170	if (!mq->queue)
	171	return -ENOMEM;
	172
97868a2b	173	memset(&mq->mqrq_cur, 0, sizeof(mq->mqrq_cur));
04296b7b	174	memset(&mq->mqrq_prev, 0, sizeof(mq->mqrq_prev));
97868a2b	175	mq->mqrq_cur = mqrq_cur;
04296b7b	176	mq->mqrq_prev = mqrq_prev;
1da177e4	177	mq->queue->queuedata = mq;
1da177e4	178
98ccf149	179	blk_queue_prep_rq(mq->queue, mmc_prep_request);
8dddfe19	180	queue_flag_set_unlocked(QUEUE_FLAG_NONROT, mq->queue);
e056a1b5 AH	181	if (mmc_can_erase(card))
e056a1b5 AH	182	mmc_queue_setup_discard(mq->queue, card);
98ccf149 PO	183
98ccf149 PO	184	#ifdef CONFIG_MMC_BLOCK_BOUNCE
a36274e0	185	if (host->max_segs == 1) {
aafabfab PO	186	unsigned int bouncesz;
aafabfab PO	187
98ccf149 PO	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;
f3eb0aaa PO	194	if (bouncesz > (host->max_blk_count * 512))
	195	bouncesz = host->max_blk_count * 512;
	196
	197	if (bouncesz > 512) {
97868a2b PF	198	mqrq_cur->bounce_buf = kmalloc(bouncesz, GFP_KERNEL);
97868a2b PF	199	if (!mqrq_cur->bounce_buf) {
a3c76eb9	200	pr_warning("%s: unable to "
97868a2b	201	"allocate bounce cur buffer\n",
f3eb0aaa PO	202	mmc_card_name(card));
f3eb0aaa PO	203	}
04296b7b PF	204	mqrq_prev->bounce_buf = kmalloc(bouncesz, GFP_KERNEL);
04296b7b PF	205	if (!mqrq_prev->bounce_buf) {
a3c76eb9	206	pr_warning("%s: unable to "
04296b7b PF	207	"allocate bounce prev buffer\n",
	208	mmc_card_name(card));
	209	kfree(mqrq_cur->bounce_buf);
	210	mqrq_cur->bounce_buf = NULL;
	211	}
f3eb0aaa	212	}
98ccf149	213
04296b7b	214	if (mqrq_cur->bounce_buf && mqrq_prev->bounce_buf) {
2ff1fa67	215	blk_queue_bounce_limit(mq->queue, BLK_BOUNCE_ANY);
086fa5ff	216	blk_queue_max_hw_sectors(mq->queue, bouncesz / 512);
8a78362c	217	blk_queue_max_segments(mq->queue, bouncesz / 512);
98ccf149 PO	218	blk_queue_max_segment_size(mq->queue, bouncesz);
98ccf149 PO	219
97868a2b PF	220	mqrq_cur->sg = mmc_alloc_sg(1, &ret);
97868a2b PF	221	if (ret)
aafabfab	222	goto cleanup_queue;
98ccf149	223
97868a2b PF	224	mqrq_cur->bounce_sg =
	225	mmc_alloc_sg(bouncesz / 512, &ret);
	226	if (ret)
aafabfab	227	goto cleanup_queue;
97868a2b	228
04296b7b PF	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;
98ccf149 PO	237	}
	238	}
	239	#endif
	240
04296b7b	241	if (!mqrq_cur->bounce_buf && !mqrq_prev->bounce_buf) {
98ccf149	242	blk_queue_bounce_limit(mq->queue, limit);
086fa5ff	243	blk_queue_max_hw_sectors(mq->queue,
f3eb0aaa	244	min(host->max_blk_count, host->max_req_size / 512));
a36274e0	245	blk_queue_max_segments(mq->queue, host->max_segs);
98ccf149 PO	246	blk_queue_max_segment_size(mq->queue, host->max_seg_size);
98ccf149 PO	247
97868a2b PF	248	mqrq_cur->sg = mmc_alloc_sg(host->max_segs, &ret);
97868a2b PF	249	if (ret)
98ccf149	250	goto cleanup_queue;
97868a2b	251
04296b7b PF	252
	253	mqrq_prev->sg = mmc_alloc_sg(host->max_segs, &ret);
	254	if (ret)
	255	goto cleanup_queue;
1da177e4 LT	256	}
1da177e4 LT	257
632cf92a	258	sema_init(&mq->thread_sem, 1);
1da177e4	259
d09408ad AH	260	mq->thread = kthread_run(mmc_queue_thread, mq, "mmcqd/%d%s",
d09408ad AH	261	host->index, subname ? subname : "");
de528fa3	262
87598a2b CH	263	if (IS_ERR(mq->thread)) {
87598a2b CH	264	ret = PTR_ERR(mq->thread);
98ccf149	265	goto free_bounce_sg;
1da177e4 LT	266	}
1da177e4 LT	267
87598a2b	268	return 0;
98ccf149	269	free_bounce_sg:
97868a2b PF	270	kfree(mqrq_cur->bounce_sg);
97868a2b PF	271	mqrq_cur->bounce_sg = NULL;
04296b7b PF	272	kfree(mqrq_prev->bounce_sg);
04296b7b PF	273	mqrq_prev->bounce_sg = NULL;
97868a2b	274
aafabfab	275	cleanup_queue:
97868a2b PF	276	kfree(mqrq_cur->sg);
	277	mqrq_cur->sg = NULL;
	278	kfree(mqrq_cur->bounce_buf);
	279	mqrq_cur->bounce_buf = NULL;
	280
04296b7b PF	281	kfree(mqrq_prev->sg);
	282	mqrq_prev->sg = NULL;
	283	kfree(mqrq_prev->bounce_buf);
	284	mqrq_prev->bounce_buf = NULL;
	285
1da177e4	286	blk_cleanup_queue(mq->queue);
1da177e4 LT	287	return ret;
1da177e4 LT	288	}
1da177e4 LT	289
	290	void mmc_cleanup_queue(struct mmc_queue *mq)
	291	{
165125e1	292	struct request_queue *q = mq->queue;
89b4e133	293	unsigned long flags;
97868a2b	294	struct mmc_queue_req *mqrq_cur = mq->mqrq_cur;
04296b7b	295	struct mmc_queue_req *mqrq_prev = mq->mqrq_prev;
89b4e133	296
d2b46f66 PO	297	/* Make sure the queue isn't suspended, as that will deadlock */
	298	mmc_queue_resume(mq);
	299
89b4e133	300	/* Then terminate our worker thread */
87598a2b	301	kthread_stop(mq->thread);
1da177e4	302
5fa83ce2 AH	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
97868a2b PF	309	kfree(mqrq_cur->bounce_sg);
97868a2b PF	310	mqrq_cur->bounce_sg = NULL;
98ccf149	311
97868a2b PF	312	kfree(mqrq_cur->sg);
97868a2b PF	313	mqrq_cur->sg = NULL;
1da177e4	314
97868a2b PF	315	kfree(mqrq_cur->bounce_buf);
97868a2b PF	316	mqrq_cur->bounce_buf = NULL;
98ccf149	317
04296b7b PF	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
1da177e4 LT	327	mq->card = NULL;
	328	}
	329	EXPORT_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	*/
	339	void mmc_queue_suspend(struct mmc_queue *mq)
	340	{
165125e1	341	struct request_queue *q = mq->queue;
1da177e4 LT	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	}
1da177e4 LT	354
	355	/**
	356	* mmc_queue_resume - resume a previously suspended MMC request queue
	357	* @mq: MMC queue to resume
	358	*/
	359	void mmc_queue_resume(struct mmc_queue *mq)
	360	{
165125e1	361	struct request_queue *q = mq->queue;
1da177e4 LT	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	}
98ac2162	374
2ff1fa67 PO	375	/*
	376	* Prepare the sg list(s) to be handed of to the host driver
	377	*/
97868a2b	378	unsigned int mmc_queue_map_sg(struct mmc_queue mq, struct mmc_queue_req mqrq)
98ccf149 PO	379	{
98ccf149 PO	380	unsigned int sg_len;
2ff1fa67 PO	381	size_t buflen;
	382	struct scatterlist *sg;
	383	int i;
98ccf149	384
97868a2b PF	385	if (!mqrq->bounce_buf)
97868a2b PF	386	return blk_rq_map_sg(mq->queue, mqrq->req, mqrq->sg);
98ccf149	387
97868a2b	388	BUG_ON(!mqrq->bounce_sg);
98ccf149	389
97868a2b	390	sg_len = blk_rq_map_sg(mq->queue, mqrq->req, mqrq->bounce_sg);
98ccf149	391
97868a2b	392	mqrq->bounce_sg_len = sg_len;
98ccf149	393
2ff1fa67	394	buflen = 0;
97868a2b	395	for_each_sg(mqrq->bounce_sg, sg, sg_len, i)
2ff1fa67	396	buflen += sg->length;
98ccf149	397
97868a2b	398	sg_init_one(mqrq->sg, mqrq->bounce_buf, buflen);
98ccf149 PO	399
	400	return 1;
	401	}
	402
2ff1fa67 PO	403	/*
	404	* If writing, bounce the data to the buffer before the request
	405	* is sent to the host driver
	406	*/
97868a2b	407	void mmc_queue_bounce_pre(struct mmc_queue_req *mqrq)
98ccf149	408	{
97868a2b	409	if (!mqrq->bounce_buf)
98ccf149 PO	410	return;
98ccf149 PO	411
97868a2b	412	if (rq_data_dir(mqrq->req) != WRITE)
98ccf149 PO	413	return;
98ccf149 PO	414
97868a2b PF	415	sg_copy_to_buffer(mqrq->bounce_sg, mqrq->bounce_sg_len,
97868a2b PF	416	mqrq->bounce_buf, mqrq->sg[0].length);
98ccf149 PO	417	}
98ccf149 PO	418
2ff1fa67 PO	419	/*
	420	* If reading, bounce the data from the buffer after the request
	421	* has been handled by the host driver
	422	*/
97868a2b	423	void mmc_queue_bounce_post(struct mmc_queue_req *mqrq)
98ccf149	424	{
97868a2b	425	if (!mqrq->bounce_buf)
98ccf149 PO	426	return;
98ccf149 PO	427
97868a2b	428	if (rq_data_dir(mqrq->req) != READ)
98ccf149 PO	429	return;
98ccf149 PO	430
97868a2b PF	431	sg_copy_from_buffer(mqrq->bounce_sg, mqrq->bounce_sg_len,
97868a2b PF	432	mqrq->bounce_buf, mqrq->sg[0].length);
98ccf149	433	}