[mirror_ubuntu-artful-kernel.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)
{
	struct mmc_queue *mq = q->queuedata;

	/*
	 * 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;
	}

	if (mq && mmc_card_removed(mq->card))
		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);

			/*
			 * 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;
		} else {
			if (kthread_should_stop()) {
				set_current_state(TASK_RUNNING);
				break;
			}
			up(&mq->thread_sem);
			schedule();
			down(&mq->thread_sem);
		}
	} 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_fn(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 && !mmc_can_discard(card))
		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) || mmc_can_sanitize(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_fn, lock);
	if (!mq->queue)
		return -ENOMEM;

	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	{
a8ad82cc SRT	32	struct mmc_queue *mq = q->queuedata;
a8ad82cc SRT	33
9c9f2d63	34	/*
bd788c96	35	* We only like normal block requests and discards.
9c9f2d63	36	*/
bd788c96	37	if (req->cmd_type != REQ_TYPE_FS && !(req->cmd_flags & REQ_DISCARD)) {
1da177e4	38	blk_dump_rq_flags(req, "MMC bad request");
9c9f2d63	39	return BLKPREP_KILL;
1da177e4 LT	40	}
1da177e4 LT	41
a8ad82cc SRT	42	if (mq && mmc_card_removed(mq->card))
	43	return BLKPREP_KILL;
	44
9c9f2d63	45	req->cmd_flags \|= REQ_DONTPREP;
1da177e4	46
9c9f2d63	47	return BLKPREP_OK;
1da177e4 LT	48	}
	49
	50	static int mmc_queue_thread(void *d)
	51	{
	52	struct mmc_queue *mq = d;
	53	struct request_queue *q = mq->queue;
1da177e4	54
83144186	55	current->flags \|= PF_MEMALLOC;
1da177e4	56
1da177e4	57	down(&mq->thread_sem);
1da177e4 LT	58	do {
1da177e4 LT	59	struct request *req = NULL;
ee8a43a5	60	struct mmc_queue_req *tmp;
1da177e4 LT	61
	62	spin_lock_irq(q->queue_lock);
	63	set_current_state(TASK_INTERRUPTIBLE);
7eaceacc	64	req = blk_fetch_request(q);
97868a2b	65	mq->mqrq_cur->req = req;
1da177e4 LT	66	spin_unlock_irq(q->queue_lock);
1da177e4 LT	67
ee8a43a5 PF	68	if (req \|\| mq->mqrq_prev->req) {
	69	set_current_state(TASK_RUNNING);
	70	mq->issue_fn(mq, req);
45c5a914 SJ	71
	72	/*
	73	* Current request becomes previous request
	74	* and vice versa.
	75	*/
	76	mq->mqrq_prev->brq.mrq.data = NULL;
	77	mq->mqrq_prev->req = NULL;
	78	tmp = mq->mqrq_prev;
	79	mq->mqrq_prev = mq->mqrq_cur;
	80	mq->mqrq_cur = tmp;
ee8a43a5	81	} else {
7b30d281 VW	82	if (kthread_should_stop()) {
7b30d281 VW	83	set_current_state(TASK_RUNNING);
1da177e4	84	break;
7b30d281	85	}
1da177e4 LT	86	up(&mq->thread_sem);
	87	schedule();
	88	down(&mq->thread_sem);
1da177e4	89	}
1da177e4	90	} while (1);
1da177e4 LT	91	up(&mq->thread_sem);
1da177e4 LT	92
1da177e4 LT	93	return 0;
	94	}
	95
	96	/*
	97	* Generic MMC request handler. This is called for any queue on a
	98	* particular host. When the host is not busy, we look for a request
	99	* on any queue on this host, and attempt to issue it. This may
	100	* not be the queue we were asked to process.
	101	*/
1b50f5f3	102	static void mmc_request_fn(struct request_queue *q)
1da177e4 LT	103	{
1da177e4 LT	104	struct mmc_queue *mq = q->queuedata;
89b4e133	105	struct request *req;
89b4e133 PO	106
89b4e133 PO	107	if (!mq) {
5fa83ce2 AH	108	while ((req = blk_fetch_request(q)) != NULL) {
5fa83ce2 AH	109	req->cmd_flags \|= REQ_QUIET;
296b2f6a	110	__blk_end_request_all(req, -EIO);
5fa83ce2	111	}
89b4e133 PO	112	return;
89b4e133 PO	113	}
1da177e4	114
ee8a43a5	115	if (!mq->mqrq_cur->req && !mq->mqrq_prev->req)
87598a2b	116	wake_up_process(mq->thread);
1da177e4 LT	117	}
1da177e4 LT	118
7513cd7a	119	static struct scatterlist mmc_alloc_sg(int sg_len, int err)
97868a2b PF	120	{
	121	struct scatterlist *sg;
	122
	123	sg = kmalloc(sizeof(struct scatterlist)*sg_len, GFP_KERNEL);
	124	if (!sg)
	125	*err = -ENOMEM;
	126	else {
	127	*err = 0;
	128	sg_init_table(sg, sg_len);
	129	}
	130
	131	return sg;
	132	}
	133
e056a1b5 AH	134	static void mmc_queue_setup_discard(struct request_queue *q,
	135	struct mmc_card *card)
	136	{
	137	unsigned max_discard;
	138
	139	max_discard = mmc_calc_max_discard(card);
	140	if (!max_discard)
	141	return;
	142
	143	queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
	144	q->limits.max_discard_sectors = max_discard;
7194efb8	145	if (card->erased_byte == 0 && !mmc_can_discard(card))
e056a1b5 AH	146	q->limits.discard_zeroes_data = 1;
	147	q->limits.discard_granularity = card->pref_erase << 9;
	148	/* granularity must not be greater than max. discard */
	149	if (card->pref_erase > max_discard)
	150	q->limits.discard_granularity = 0;
d9ddd629	151	if (mmc_can_secure_erase_trim(card) \|\| mmc_can_sanitize(card))
e056a1b5 AH	152	queue_flag_set_unlocked(QUEUE_FLAG_SECDISCARD, q);
	153	}
	154
1da177e4 LT	155	/**
	156	* mmc_init_queue - initialise a queue structure.
	157	* @mq: mmc queue
	158	* @card: mmc card to attach this queue
	159	* @lock: queue lock
d09408ad	160	* @subname: partition subname
1da177e4 LT	161	*
	162	* Initialise a MMC card request queue.
	163	*/
d09408ad AH	164	int mmc_init_queue(struct mmc_queue mq, struct mmc_card card,
d09408ad AH	165	spinlock_t lock, const char subname)
1da177e4 LT	166	{
	167	struct mmc_host *host = card->host;
	168	u64 limit = BLK_BOUNCE_HIGH;
	169	int ret;
97868a2b	170	struct mmc_queue_req *mqrq_cur = &mq->mqrq[0];
04296b7b	171	struct mmc_queue_req *mqrq_prev = &mq->mqrq[1];
1da177e4	172
fcaf71fd GKH	173	if (mmc_dev(host)->dma_mask && *mmc_dev(host)->dma_mask)
fcaf71fd GKH	174	limit = *mmc_dev(host)->dma_mask;
1da177e4 LT	175
1da177e4 LT	176	mq->card = card;
1b50f5f3	177	mq->queue = blk_init_queue(mmc_request_fn, lock);
1da177e4 LT	178	if (!mq->queue)
	179	return -ENOMEM;
	180
97868a2b	181	mq->mqrq_cur = mqrq_cur;
04296b7b	182	mq->mqrq_prev = mqrq_prev;
1da177e4	183	mq->queue->queuedata = mq;
1da177e4	184
98ccf149	185	blk_queue_prep_rq(mq->queue, mmc_prep_request);
8dddfe19	186	queue_flag_set_unlocked(QUEUE_FLAG_NONROT, mq->queue);
e056a1b5 AH	187	if (mmc_can_erase(card))
e056a1b5 AH	188	mmc_queue_setup_discard(mq->queue, card);
98ccf149 PO	189
98ccf149 PO	190	#ifdef CONFIG_MMC_BLOCK_BOUNCE
a36274e0	191	if (host->max_segs == 1) {
aafabfab PO	192	unsigned int bouncesz;
aafabfab PO	193
98ccf149 PO	194	bouncesz = MMC_QUEUE_BOUNCESZ;
	195
	196	if (bouncesz > host->max_req_size)
	197	bouncesz = host->max_req_size;
	198	if (bouncesz > host->max_seg_size)
	199	bouncesz = host->max_seg_size;
f3eb0aaa PO	200	if (bouncesz > (host->max_blk_count * 512))
	201	bouncesz = host->max_blk_count * 512;
	202
	203	if (bouncesz > 512) {
97868a2b PF	204	mqrq_cur->bounce_buf = kmalloc(bouncesz, GFP_KERNEL);
97868a2b PF	205	if (!mqrq_cur->bounce_buf) {
a3c76eb9	206	pr_warning("%s: unable to "
97868a2b	207	"allocate bounce cur buffer\n",
f3eb0aaa PO	208	mmc_card_name(card));
f3eb0aaa PO	209	}
04296b7b PF	210	mqrq_prev->bounce_buf = kmalloc(bouncesz, GFP_KERNEL);
04296b7b PF	211	if (!mqrq_prev->bounce_buf) {
a3c76eb9	212	pr_warning("%s: unable to "
04296b7b PF	213	"allocate bounce prev buffer\n",
	214	mmc_card_name(card));
	215	kfree(mqrq_cur->bounce_buf);
	216	mqrq_cur->bounce_buf = NULL;
	217	}
f3eb0aaa	218	}
98ccf149	219
04296b7b	220	if (mqrq_cur->bounce_buf && mqrq_prev->bounce_buf) {
2ff1fa67	221	blk_queue_bounce_limit(mq->queue, BLK_BOUNCE_ANY);
086fa5ff	222	blk_queue_max_hw_sectors(mq->queue, bouncesz / 512);
8a78362c	223	blk_queue_max_segments(mq->queue, bouncesz / 512);
98ccf149 PO	224	blk_queue_max_segment_size(mq->queue, bouncesz);
98ccf149 PO	225
97868a2b PF	226	mqrq_cur->sg = mmc_alloc_sg(1, &ret);
97868a2b PF	227	if (ret)
aafabfab	228	goto cleanup_queue;
98ccf149	229
97868a2b PF	230	mqrq_cur->bounce_sg =
	231	mmc_alloc_sg(bouncesz / 512, &ret);
	232	if (ret)
aafabfab	233	goto cleanup_queue;
97868a2b	234
04296b7b PF	235	mqrq_prev->sg = mmc_alloc_sg(1, &ret);
	236	if (ret)
	237	goto cleanup_queue;
	238
	239	mqrq_prev->bounce_sg =
	240	mmc_alloc_sg(bouncesz / 512, &ret);
	241	if (ret)
	242	goto cleanup_queue;
98ccf149 PO	243	}
	244	}
	245	#endif
	246
04296b7b	247	if (!mqrq_cur->bounce_buf && !mqrq_prev->bounce_buf) {
98ccf149	248	blk_queue_bounce_limit(mq->queue, limit);
086fa5ff	249	blk_queue_max_hw_sectors(mq->queue,
f3eb0aaa	250	min(host->max_blk_count, host->max_req_size / 512));
a36274e0	251	blk_queue_max_segments(mq->queue, host->max_segs);
98ccf149 PO	252	blk_queue_max_segment_size(mq->queue, host->max_seg_size);
98ccf149 PO	253
97868a2b PF	254	mqrq_cur->sg = mmc_alloc_sg(host->max_segs, &ret);
97868a2b PF	255	if (ret)
98ccf149	256	goto cleanup_queue;
97868a2b	257
04296b7b PF	258
	259	mqrq_prev->sg = mmc_alloc_sg(host->max_segs, &ret);
	260	if (ret)
	261	goto cleanup_queue;
1da177e4 LT	262	}
1da177e4 LT	263
632cf92a	264	sema_init(&mq->thread_sem, 1);
1da177e4	265
d09408ad AH	266	mq->thread = kthread_run(mmc_queue_thread, mq, "mmcqd/%d%s",
d09408ad AH	267	host->index, subname ? subname : "");
de528fa3	268
87598a2b CH	269	if (IS_ERR(mq->thread)) {
87598a2b CH	270	ret = PTR_ERR(mq->thread);
98ccf149	271	goto free_bounce_sg;
1da177e4 LT	272	}
1da177e4 LT	273
87598a2b	274	return 0;
98ccf149	275	free_bounce_sg:
97868a2b PF	276	kfree(mqrq_cur->bounce_sg);
97868a2b PF	277	mqrq_cur->bounce_sg = NULL;
04296b7b PF	278	kfree(mqrq_prev->bounce_sg);
04296b7b PF	279	mqrq_prev->bounce_sg = NULL;
97868a2b	280
aafabfab	281	cleanup_queue:
97868a2b PF	282	kfree(mqrq_cur->sg);
	283	mqrq_cur->sg = NULL;
	284	kfree(mqrq_cur->bounce_buf);
	285	mqrq_cur->bounce_buf = NULL;
	286
04296b7b PF	287	kfree(mqrq_prev->sg);
	288	mqrq_prev->sg = NULL;
	289	kfree(mqrq_prev->bounce_buf);
	290	mqrq_prev->bounce_buf = NULL;
	291
1da177e4	292	blk_cleanup_queue(mq->queue);
1da177e4 LT	293	return ret;
1da177e4 LT	294	}
1da177e4 LT	295
	296	void mmc_cleanup_queue(struct mmc_queue *mq)
	297	{
165125e1	298	struct request_queue *q = mq->queue;
89b4e133	299	unsigned long flags;
97868a2b	300	struct mmc_queue_req *mqrq_cur = mq->mqrq_cur;
04296b7b	301	struct mmc_queue_req *mqrq_prev = mq->mqrq_prev;
89b4e133	302
d2b46f66 PO	303	/* Make sure the queue isn't suspended, as that will deadlock */
	304	mmc_queue_resume(mq);
	305
89b4e133	306	/* Then terminate our worker thread */
87598a2b	307	kthread_stop(mq->thread);
1da177e4	308
5fa83ce2 AH	309	/* Empty the queue */
	310	spin_lock_irqsave(q->queue_lock, flags);
	311	q->queuedata = NULL;
	312	blk_start_queue(q);
	313	spin_unlock_irqrestore(q->queue_lock, flags);
	314
97868a2b PF	315	kfree(mqrq_cur->bounce_sg);
97868a2b PF	316	mqrq_cur->bounce_sg = NULL;
98ccf149	317
97868a2b PF	318	kfree(mqrq_cur->sg);
97868a2b PF	319	mqrq_cur->sg = NULL;
1da177e4	320
97868a2b PF	321	kfree(mqrq_cur->bounce_buf);
97868a2b PF	322	mqrq_cur->bounce_buf = NULL;
98ccf149	323
04296b7b PF	324	kfree(mqrq_prev->bounce_sg);
	325	mqrq_prev->bounce_sg = NULL;
	326
	327	kfree(mqrq_prev->sg);
	328	mqrq_prev->sg = NULL;
	329
	330	kfree(mqrq_prev->bounce_buf);
	331	mqrq_prev->bounce_buf = NULL;
	332
1da177e4 LT	333	mq->card = NULL;
	334	}
	335	EXPORT_SYMBOL(mmc_cleanup_queue);
	336
	337	/**
	338	* mmc_queue_suspend - suspend a MMC request queue
	339	* @mq: MMC queue to suspend
	340	*
	341	* Stop the block request queue, and wait for our thread to
	342	* complete any outstanding requests. This ensures that we
	343	* won't suspend while a request is being processed.
	344	*/
	345	void mmc_queue_suspend(struct mmc_queue *mq)
	346	{
165125e1	347	struct request_queue *q = mq->queue;
1da177e4 LT	348	unsigned long flags;
	349
	350	if (!(mq->flags & MMC_QUEUE_SUSPENDED)) {
	351	mq->flags \|= MMC_QUEUE_SUSPENDED;
	352
	353	spin_lock_irqsave(q->queue_lock, flags);
	354	blk_stop_queue(q);
	355	spin_unlock_irqrestore(q->queue_lock, flags);
	356
	357	down(&mq->thread_sem);
	358	}
	359	}
1da177e4 LT	360
	361	/**
	362	* mmc_queue_resume - resume a previously suspended MMC request queue
	363	* @mq: MMC queue to resume
	364	*/
	365	void mmc_queue_resume(struct mmc_queue *mq)
	366	{
165125e1	367	struct request_queue *q = mq->queue;
1da177e4 LT	368	unsigned long flags;
	369
	370	if (mq->flags & MMC_QUEUE_SUSPENDED) {
	371	mq->flags &= ~MMC_QUEUE_SUSPENDED;
	372
	373	up(&mq->thread_sem);
	374
	375	spin_lock_irqsave(q->queue_lock, flags);
	376	blk_start_queue(q);
	377	spin_unlock_irqrestore(q->queue_lock, flags);
	378	}
	379	}
98ac2162	380
2ff1fa67 PO	381	/*
	382	* Prepare the sg list(s) to be handed of to the host driver
	383	*/
97868a2b	384	unsigned int mmc_queue_map_sg(struct mmc_queue mq, struct mmc_queue_req mqrq)
98ccf149 PO	385	{
98ccf149 PO	386	unsigned int sg_len;
2ff1fa67 PO	387	size_t buflen;
	388	struct scatterlist *sg;
	389	int i;
98ccf149	390
97868a2b PF	391	if (!mqrq->bounce_buf)
97868a2b PF	392	return blk_rq_map_sg(mq->queue, mqrq->req, mqrq->sg);
98ccf149	393
97868a2b	394	BUG_ON(!mqrq->bounce_sg);
98ccf149	395
97868a2b	396	sg_len = blk_rq_map_sg(mq->queue, mqrq->req, mqrq->bounce_sg);
98ccf149	397
97868a2b	398	mqrq->bounce_sg_len = sg_len;
98ccf149	399
2ff1fa67	400	buflen = 0;
97868a2b	401	for_each_sg(mqrq->bounce_sg, sg, sg_len, i)
2ff1fa67	402	buflen += sg->length;
98ccf149	403
97868a2b	404	sg_init_one(mqrq->sg, mqrq->bounce_buf, buflen);
98ccf149 PO	405
	406	return 1;
	407	}
	408
2ff1fa67 PO	409	/*
	410	* If writing, bounce the data to the buffer before the request
	411	* is sent to the host driver
	412	*/
97868a2b	413	void mmc_queue_bounce_pre(struct mmc_queue_req *mqrq)
98ccf149	414	{
97868a2b	415	if (!mqrq->bounce_buf)
98ccf149 PO	416	return;
98ccf149 PO	417
97868a2b	418	if (rq_data_dir(mqrq->req) != WRITE)
98ccf149 PO	419	return;
98ccf149 PO	420
97868a2b PF	421	sg_copy_to_buffer(mqrq->bounce_sg, mqrq->bounce_sg_len,
97868a2b PF	422	mqrq->bounce_buf, mqrq->sg[0].length);
98ccf149 PO	423	}
98ccf149 PO	424
2ff1fa67 PO	425	/*
	426	* If reading, bounce the data from the buffer after the request
	427	* has been handled by the host driver
	428	*/
97868a2b	429	void mmc_queue_bounce_post(struct mmc_queue_req *mqrq)
98ccf149	430	{
97868a2b	431	if (!mqrq->bounce_buf)
98ccf149 PO	432	return;
98ccf149 PO	433
97868a2b	434	if (rq_data_dir(mqrq->req) != READ)
98ccf149 PO	435	return;
98ccf149 PO	436
97868a2b PF	437	sg_copy_from_buffer(mqrq->bounce_sg, mqrq->bounce_sg_len,
97868a2b PF	438	mqrq->bounce_buf, mqrq->sg[0].length);
98ccf149	439	}