Release 4.13 drivers/mmc/core/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/dma-mapping.h>

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

#include "queue.h"
#include "block.h"
#include "core.h"
#include "card.h"


#define MMC_QUEUE_BOUNCESZ	65536

/*
 * 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;

	if (mq && (mmc_card_removed(mq->card) || mmc_access_rpmb(mq)))
		return BLKPREP_KILL;

	req->rq_flags |= RQF_DONTPREP;

	return BLKPREP_OK;
}

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7
12.73%
1
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Christoph Hellwig
2
3.64%
1
20.00%
Pierre Ossman
1
1.82%
1
20.00%
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55
100.00%
5
100.00%



static int mmc_queue_thread(void *d)
{
	struct mmc_queue *mq = d;
	struct request_queue *q = mq->queue;
	struct mmc_context_info *cntx = &mq->card->host->context_info;

	current->flags |= PF_MEMALLOC;

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

		spin_lock_irq(q->queue_lock);
		set_current_state(TASK_INTERRUPTIBLE);
		req = blk_fetch_request(q);
		mq->asleep = false;
		cntx->is_waiting_last_req = false;
		cntx->is_new_req = false;
		if (!req) {
			/*
                         * Dispatch queue is empty so set flags for
                         * mmc_request_fn() to wake us up.
                         */
			if (mq->qcnt)
				cntx->is_waiting_last_req = true;
			else
				mq->asleep = true;
		}
		spin_unlock_irq(q->queue_lock);

		if (req || mq->qcnt) {
			set_current_state(TASK_RUNNING);
			mmc_blk_issue_rq(mq, req);
			cond_resched();
		} 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;
}

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58
27.75%
2
16.67%
Seungwon Jeon
36
17.22%
1
8.33%
Per Forlin
15
7.18%
1
8.33%
Rabin Vincent
3
1.44%
1
8.33%
Juha Yrjölä
2
0.96%
1
8.33%
Tejun Heo
1
0.48%
1
8.33%
Linus Walleij
1
0.48%
1
8.33%
Total
209
100.00%
12
100.00%

/*
 * 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;
	struct mmc_context_info *cntx;

	if (!mq) {
		while ((req = blk_fetch_request(q)) != NULL) {
			req->rq_flags |= RQF_QUIET;
			__blk_end_request_all(req, BLK_STS_IOERR);
		}
		return;
	}

	cntx = &mq->card->host->context_info;

	if (cntx->is_waiting_last_req) {
		cntx->is_new_req = true;
		wake_up_interruptible(&cntx->wait);
	}

	if (mq->asleep)
		wake_up_process(mq->thread);
}

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Konstantin Dorfman
38
33.93%
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7.69%
Pierre Ossman
30
26.79%
1
7.69%
Russell King
25
22.32%
1
7.69%
Adrian Hunter
7
6.25%
2
15.38%
Christoph Hellwig
5
4.46%
3
23.08%
Jens Axboe
2
1.79%
1
7.69%
Per Forlin
2
1.79%
1
7.69%
Tejun Heo
2
1.79%
2
15.38%
Venkatraman Sathiyamoorthy
1
0.89%
1
7.69%
Total
112
100.00%
13
100.00%



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

	sg = kmalloc_array(sg_len, sizeof(*sg), gfp);
	if (sg)
		sg_init_table(sg, sg_len);

	return sg;
}

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Per Forlin
38
79.17%
1
25.00%
SF Markus Elfring
5
10.42%
1
25.00%
Linus Walleij
4
8.33%
1
25.00%
Venkatraman Sathiyamoorthy
1
2.08%
1
25.00%
Total
48
100.00%
4
100.00%



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);
	blk_queue_max_discard_sectors(q, max_discard);
	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_SECERASE, q);
}

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1
1.12%
1
33.33%
Total
89
100.00%
3
100.00%



static unsigned int mmc_queue_calc_bouncesz(struct mmc_host *host)
{
	unsigned int bouncesz = MMC_QUEUE_BOUNCESZ;

	if (host->max_segs != 1 || (host->caps & MMC_CAP_NO_BOUNCE_BUFF))
		return 0;

	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)
		return 0;

	return bouncesz;
}

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3
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95
100.00%
4
100.00%

/**
 * mmc_init_request() - initialize the MMC-specific per-request data
 * @q: the request queue
 * @req: the request
 * @gfp: memory allocation policy
 */


static int mmc_init_request(struct request_queue *q, struct request *req,
			    gfp_t gfp)
{
	struct mmc_queue_req *mq_rq = req_to_mmc_queue_req(req);
	struct mmc_queue *mq = q->queuedata;
	struct mmc_card *card = mq->card;
	struct mmc_host *host = card->host;

	if (card->bouncesz) {
		mq_rq->bounce_buf = kmalloc(card->bouncesz, gfp);
		if (!mq_rq->bounce_buf)
			return -ENOMEM;
		if (card->bouncesz > 512) {
			mq_rq->sg = mmc_alloc_sg(1, gfp);
			if (!mq_rq->sg)
				return -ENOMEM;
			mq_rq->bounce_sg = mmc_alloc_sg(card->bouncesz / 512,
							gfp);
			if (!mq_rq->bounce_sg)
				return -ENOMEM;
		}
	} else {
		mq_rq->bounce_buf = NULL;
		mq_rq->bounce_sg = NULL;
		mq_rq->sg = mmc_alloc_sg(host->max_segs, gfp);
		if (!mq_rq->sg)
			return -ENOMEM;
	}

	return 0;
}

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100.00%



static void mmc_exit_request(struct request_queue *q, struct request *req)
{
	struct mmc_queue_req *mq_rq = req_to_mmc_queue_req(req);

	/* It is OK to kfree(NULL) so this will be smooth */
	kfree(mq_rq->bounce_sg);
	mq_rq->bounce_sg = NULL;

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

	kfree(mq_rq->sg);
	mq_rq->sg = NULL;
}

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3
100.00%

/**
 * 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 = -ENOMEM;

	if (mmc_dev(host)->dma_mask && *mmc_dev(host)->dma_mask)
		limit = (u64)dma_max_pfn(mmc_dev(host)) << PAGE_SHIFT;

	mq->card = card;
	mq->queue = blk_alloc_queue(GFP_KERNEL);
	if (!mq->queue)
		return -ENOMEM;
	mq->queue->queue_lock = lock;
	mq->queue->request_fn = mmc_request_fn;
	mq->queue->init_rq_fn = mmc_init_request;
	mq->queue->exit_rq_fn = mmc_exit_request;
	mq->queue->cmd_size = sizeof(struct mmc_queue_req);
	mq->queue->queuedata = mq;
	mq->qcnt = 0;
	ret = blk_init_allocated_queue(mq->queue);
	if (ret) {
		blk_cleanup_queue(mq->queue);
		return ret;
	}

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

	card->bouncesz = mmc_queue_calc_bouncesz(host);
	if (card->bouncesz) {
		blk_queue_max_hw_sectors(mq->queue, card->bouncesz / 512);
		blk_queue_max_segments(mq->queue, card->bouncesz / 512);
		blk_queue_max_segment_size(mq->queue, card->bouncesz);
	} else {
		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);
	}

	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 cleanup_queue;
	}

	return 0;

cleanup_queue:
	blk_cleanup_queue(mq->queue);
	return ret;
}

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15.97%
5
16.67%
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45
11.06%
7
23.33%
Christoph Hellwig
15
3.69%
1
3.33%
Per Forlin
11
2.70%
2
6.67%
Greg Kroah-Hartman
9
2.21%
1
3.33%
Mike Snitzer
9
2.21%
1
3.33%
Martin K. Petersen
5
1.23%
3
10.00%
Santosh Shilimkar
5
1.23%
1
3.33%
Ethan Du
4
0.98%
1
3.33%
Thomas Gleixner
3
0.74%
1
3.33%
Total
407
100.00%
30
100.00%



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);

	mq->card = NULL;
}
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22
30.14%
2
33.33%
Jens Axboe
2
2.74%
1
16.67%
Total
73
100.00%
6
100.00%


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->suspended) {
		mq->suspended |= true;

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

		down(&mq->thread_sem);
	}
}

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2
2.90%
1
33.33%
Total
69
100.00%
3
100.00%

/**
 * 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->suspended) {
		mq->suspended = false;

		up(&mq->thread_sem);

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

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2
2.94%
1
33.33%
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68
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3
100.00%

/*
 * 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;
	struct request *req = mmc_queue_req_to_req(mqrq);
	int i;

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

	sg_len = blk_rq_map_sg(mq->queue, 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;
}

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Per Forlin
12
10.08%
1
20.00%
Linus Walleij
10
8.40%
1
20.00%
Jens Axboe
4
3.36%
1
20.00%
Total
119
100.00%
5
100.00%

/*
 * 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(mmc_queue_req_to_req(mqrq)) != WRITE)
		return;

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

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3
5.45%
1
25.00%
Total
55
100.00%
4
100.00%

/*
 * 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(mmc_queue_req_to_req(mqrq)) != READ)
		return;

	sg_copy_from_buffer(mqrq->bounce_sg, mqrq->bounce_sg_len,
		mqrq->bounce_buf, mqrq->sg[0].length);
}
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44
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8
14.55%
1
25.00%
Linus Walleij
3
5.45%
1
25.00%
Total
55
100.00%
4
100.00%

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13.04%
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356
20.16%
13
18.84%
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313
17.72%
9
13.04%
Linus Walleij
312
17.67%
4
5.80%
Per Forlin
94
5.32%
3
4.35%
Konstantin Dorfman
38
2.15%
1
1.45%
Seungwon Jeon
36
2.04%
1
1.45%
Christoph Hellwig
26
1.47%
4
5.80%
Sujit Reddy Thumma
23
1.30%
1
1.45%
Jens Axboe
19
1.08%
3
4.35%
Mike Snitzer
9
0.51%
1
1.45%
Greg Kroah-Hartman
9
0.51%
1
1.45%
Santosh Shilimkar
8
0.45%
1
1.45%
Ulf Hansson
7
0.40%
3
4.35%
Chuanxiao Dong
7
0.40%
1
1.45%
Tejun Heo
6
0.34%
3
4.35%
Martin K. Petersen
5
0.28%
3
4.35%
SF Markus Elfring
5
0.28%
1
1.45%
Ethan Du
4
0.23%
1
1.45%
Rabin Vincent
3
0.17%
1
1.45%
Thomas Gleixner
3
0.17%
1
1.45%
Rafael J. Wysocki
3
0.17%
1
1.45%
Juha Yrjölä
2
0.11%
1
1.45%
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2
0.11%
2
2.90%
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1766
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69
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Directory: drivers/mmc/core

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