[thirdparty/linux.git] / drivers / mmc / core / queue.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 *  Copyright (C) 2003 Russell King, All Rights Reserved.
 *  Copyright 2006-2007 Pierre Ossman
 */
#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/backing-dev.h>

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

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

#define MMC_DMA_MAP_MERGE_SEGMENTS	512

static inline bool mmc_cqe_dcmd_busy(struct mmc_queue *mq)
{
	/* Allow only 1 DCMD at a time */
	return mq->in_flight[MMC_ISSUE_DCMD];
}

void mmc_cqe_check_busy(struct mmc_queue *mq)
{
	if ((mq->cqe_busy & MMC_CQE_DCMD_BUSY) && !mmc_cqe_dcmd_busy(mq))
		mq->cqe_busy &= ~MMC_CQE_DCMD_BUSY;

	mq->cqe_busy &= ~MMC_CQE_QUEUE_FULL;
}

static inline bool mmc_cqe_can_dcmd(struct mmc_host *host)
{
	return host->caps2 & MMC_CAP2_CQE_DCMD;
}

static enum mmc_issue_type mmc_cqe_issue_type(struct mmc_host *host,
					      struct request *req)
{
	switch (req_op(req)) {
	case REQ_OP_DRV_IN:
	case REQ_OP_DRV_OUT:
	case REQ_OP_DISCARD:
	case REQ_OP_SECURE_ERASE:
		return MMC_ISSUE_SYNC;
	case REQ_OP_FLUSH:
		return mmc_cqe_can_dcmd(host) ? MMC_ISSUE_DCMD : MMC_ISSUE_SYNC;
	default:
		return MMC_ISSUE_ASYNC;
	}
}

enum mmc_issue_type mmc_issue_type(struct mmc_queue *mq, struct request *req)
{
	struct mmc_host *host = mq->card->host;

	if (mq->use_cqe && !host->hsq_enabled)
		return mmc_cqe_issue_type(host, req);

	if (req_op(req) == REQ_OP_READ || req_op(req) == REQ_OP_WRITE)
		return MMC_ISSUE_ASYNC;

	return MMC_ISSUE_SYNC;
}

static void __mmc_cqe_recovery_notifier(struct mmc_queue *mq)
{
	if (!mq->recovery_needed) {
		mq->recovery_needed = true;
		schedule_work(&mq->recovery_work);
	}
}

void mmc_cqe_recovery_notifier(struct mmc_request *mrq)
{
	struct mmc_queue_req *mqrq = container_of(mrq, struct mmc_queue_req,
						  brq.mrq);
	struct request *req = mmc_queue_req_to_req(mqrq);
	struct request_queue *q = req->q;
	struct mmc_queue *mq = q->queuedata;
	unsigned long flags;

	spin_lock_irqsave(&mq->lock, flags);
	__mmc_cqe_recovery_notifier(mq);
	spin_unlock_irqrestore(&mq->lock, flags);
}

static enum blk_eh_timer_return mmc_cqe_timed_out(struct request *req)
{
	struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
	struct mmc_request *mrq = &mqrq->brq.mrq;
	struct mmc_queue *mq = req->q->queuedata;
	struct mmc_host *host = mq->card->host;
	enum mmc_issue_type issue_type = mmc_issue_type(mq, req);
	bool recovery_needed = false;

	switch (issue_type) {
	case MMC_ISSUE_ASYNC:
	case MMC_ISSUE_DCMD:
		if (host->cqe_ops->cqe_timeout(host, mrq, &recovery_needed)) {
			if (recovery_needed)
				mmc_cqe_recovery_notifier(mrq);
			return BLK_EH_RESET_TIMER;
		}
		/* The request has gone already */
		return BLK_EH_DONE;
	default:
		/* Timeout is handled by mmc core */
		return BLK_EH_RESET_TIMER;
	}
}

static enum blk_eh_timer_return mmc_mq_timed_out(struct request *req,
						 bool reserved)
{
	struct request_queue *q = req->q;
	struct mmc_queue *mq = q->queuedata;
	struct mmc_card *card = mq->card;
	struct mmc_host *host = card->host;
	unsigned long flags;
	bool ignore_tout;

	spin_lock_irqsave(&mq->lock, flags);
	ignore_tout = mq->recovery_needed || !mq->use_cqe || host->hsq_enabled;
	spin_unlock_irqrestore(&mq->lock, flags);

	return ignore_tout ? BLK_EH_RESET_TIMER : mmc_cqe_timed_out(req);
}

static void mmc_mq_recovery_handler(struct work_struct *work)
{
	struct mmc_queue *mq = container_of(work, struct mmc_queue,
					    recovery_work);
	struct request_queue *q = mq->queue;
	struct mmc_host *host = mq->card->host;

	mmc_get_card(mq->card, &mq->ctx);

	mq->in_recovery = true;

	if (mq->use_cqe && !host->hsq_enabled)
		mmc_blk_cqe_recovery(mq);
	else
		mmc_blk_mq_recovery(mq);

	mq->in_recovery = false;

	spin_lock_irq(&mq->lock);
	mq->recovery_needed = false;
	spin_unlock_irq(&mq->lock);

	if (host->hsq_enabled)
		host->cqe_ops->cqe_recovery_finish(host);

	mmc_put_card(mq->card, &mq->ctx);

	blk_mq_run_hw_queues(q, true);
}

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;
}

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;

	blk_queue_flag_set(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))
		blk_queue_flag_set(QUEUE_FLAG_SECERASE, q);
}

static unsigned int mmc_get_max_segments(struct mmc_host *host)
{
	return host->can_dma_map_merge ? MMC_DMA_MAP_MERGE_SEGMENTS :
					 host->max_segs;
}

/**
 * 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 mmc_queue *mq, struct request *req,
			      gfp_t gfp)
{
	struct mmc_queue_req *mq_rq = req_to_mmc_queue_req(req);
	struct mmc_card *card = mq->card;
	struct mmc_host *host = card->host;

	mq_rq->sg = mmc_alloc_sg(mmc_get_max_segments(host), gfp);
	if (!mq_rq->sg)
		return -ENOMEM;

	return 0;
}

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

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

static int mmc_mq_init_request(struct blk_mq_tag_set *set, struct request *req,
			       unsigned int hctx_idx, unsigned int numa_node)
{
	return __mmc_init_request(set->driver_data, req, GFP_KERNEL);
}

static void mmc_mq_exit_request(struct blk_mq_tag_set *set, struct request *req,
				unsigned int hctx_idx)
{
	struct mmc_queue *mq = set->driver_data;

	mmc_exit_request(mq->queue, req);
}

static blk_status_t mmc_mq_queue_rq(struct blk_mq_hw_ctx *hctx,
				    const struct blk_mq_queue_data *bd)
{
	struct request *req = bd->rq;
	struct request_queue *q = req->q;
	struct mmc_queue *mq = q->queuedata;
	struct mmc_card *card = mq->card;
	struct mmc_host *host = card->host;
	enum mmc_issue_type issue_type;
	enum mmc_issued issued;
	bool get_card, cqe_retune_ok;
	int ret;

	if (mmc_card_removed(mq->card)) {
		req->rq_flags |= RQF_QUIET;
		return BLK_STS_IOERR;
	}

	issue_type = mmc_issue_type(mq, req);

	spin_lock_irq(&mq->lock);

	if (mq->recovery_needed || mq->busy) {
		spin_unlock_irq(&mq->lock);
		return BLK_STS_RESOURCE;
	}

	switch (issue_type) {
	case MMC_ISSUE_DCMD:
		if (mmc_cqe_dcmd_busy(mq)) {
			mq->cqe_busy |= MMC_CQE_DCMD_BUSY;
			spin_unlock_irq(&mq->lock);
			return BLK_STS_RESOURCE;
		}
		break;
	case MMC_ISSUE_ASYNC:
		/*
		 * For MMC host software queue, we only allow 2 requests in
		 * flight to avoid a long latency.
		 */
		if (host->hsq_enabled && mq->in_flight[issue_type] > 2) {
			spin_unlock_irq(&mq->lock);
			return BLK_STS_RESOURCE;
		}
		break;
	default:
		/*
		 * Timeouts are handled by mmc core, and we don't have a host
		 * API to abort requests, so we can't handle the timeout anyway.
		 * However, when the timeout happens, blk_mq_complete_request()
		 * no longer works (to stop the request disappearing under us).
		 * To avoid racing with that, set a large timeout.
		 */
		req->timeout = 600 * HZ;
		break;
	}

	/* Parallel dispatch of requests is not supported at the moment */
	mq->busy = true;

	mq->in_flight[issue_type] += 1;
	get_card = (mmc_tot_in_flight(mq) == 1);
	cqe_retune_ok = (mmc_cqe_qcnt(mq) == 1);

	spin_unlock_irq(&mq->lock);

	if (!(req->rq_flags & RQF_DONTPREP)) {
		req_to_mmc_queue_req(req)->retries = 0;
		req->rq_flags |= RQF_DONTPREP;
	}

	if (get_card)
		mmc_get_card(card, &mq->ctx);

	if (mq->use_cqe) {
		host->retune_now = host->need_retune && cqe_retune_ok &&
				   !host->hold_retune;
	}

	blk_mq_start_request(req);

	issued = mmc_blk_mq_issue_rq(mq, req);

	switch (issued) {
	case MMC_REQ_BUSY:
		ret = BLK_STS_RESOURCE;
		break;
	case MMC_REQ_FAILED_TO_START:
		ret = BLK_STS_IOERR;
		break;
	default:
		ret = BLK_STS_OK;
		break;
	}

	if (issued != MMC_REQ_STARTED) {
		bool put_card = false;

		spin_lock_irq(&mq->lock);
		mq->in_flight[issue_type] -= 1;
		if (mmc_tot_in_flight(mq) == 0)
			put_card = true;
		mq->busy = false;
		spin_unlock_irq(&mq->lock);
		if (put_card)
			mmc_put_card(card, &mq->ctx);
	} else {
		WRITE_ONCE(mq->busy, false);
	}

	return ret;
}

static const struct blk_mq_ops mmc_mq_ops = {
	.queue_rq	= mmc_mq_queue_rq,
	.init_request	= mmc_mq_init_request,
	.exit_request	= mmc_mq_exit_request,
	.complete	= mmc_blk_mq_complete,
	.timeout	= mmc_mq_timed_out,
};

static void mmc_setup_queue(struct mmc_queue *mq, struct mmc_card *card)
{
	struct mmc_host *host = card->host;
	unsigned block_size = 512;

	blk_queue_flag_set(QUEUE_FLAG_NONROT, mq->queue);
	blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, mq->queue);
	if (mmc_can_erase(card))
		mmc_queue_setup_discard(mq->queue, card);

	if (!mmc_dev(host)->dma_mask || !*mmc_dev(host)->dma_mask)
		blk_queue_bounce_limit(mq->queue, BLK_BOUNCE_HIGH);
	blk_queue_max_hw_sectors(mq->queue,
		min(host->max_blk_count, host->max_req_size / 512));
	if (host->can_dma_map_merge)
		WARN(!blk_queue_can_use_dma_map_merging(mq->queue,
							mmc_dev(host)),
		     "merging was advertised but not possible");
	blk_queue_max_segments(mq->queue, mmc_get_max_segments(host));

	if (mmc_card_mmc(card))
		block_size = card->ext_csd.data_sector_size;

	blk_queue_logical_block_size(mq->queue, block_size);
	/*
	 * After blk_queue_can_use_dma_map_merging() was called with succeed,
	 * since it calls blk_queue_virt_boundary(), the mmc should not call
	 * both blk_queue_max_segment_size().
	 */
	if (!host->can_dma_map_merge)
		blk_queue_max_segment_size(mq->queue,
			round_down(host->max_seg_size, block_size));

	dma_set_max_seg_size(mmc_dev(host), queue_max_segment_size(mq->queue));

	INIT_WORK(&mq->recovery_work, mmc_mq_recovery_handler);
	INIT_WORK(&mq->complete_work, mmc_blk_mq_complete_work);

	mutex_init(&mq->complete_lock);

	init_waitqueue_head(&mq->wait);
}

static inline bool mmc_merge_capable(struct mmc_host *host)
{
	return host->caps2 & MMC_CAP2_MERGE_CAPABLE;
}

/* Set queue depth to get a reasonable value for q->nr_requests */
#define MMC_QUEUE_DEPTH 64

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

	mq->card = card;
	mq->use_cqe = host->cqe_enabled;
	
	spin_lock_init(&mq->lock);

	memset(&mq->tag_set, 0, sizeof(mq->tag_set));
	mq->tag_set.ops = &mmc_mq_ops;
	/*
	 * The queue depth for CQE must match the hardware because the request
	 * tag is used to index the hardware queue.
	 */
	if (mq->use_cqe && !host->hsq_enabled)
		mq->tag_set.queue_depth =
			min_t(int, card->ext_csd.cmdq_depth, host->cqe_qdepth);
	else
		mq->tag_set.queue_depth = MMC_QUEUE_DEPTH;
	mq->tag_set.numa_node = NUMA_NO_NODE;
	mq->tag_set.flags = BLK_MQ_F_SHOULD_MERGE | BLK_MQ_F_BLOCKING;
	mq->tag_set.nr_hw_queues = 1;
	mq->tag_set.cmd_size = sizeof(struct mmc_queue_req);
	mq->tag_set.driver_data = mq;

	/*
	 * Since blk_mq_alloc_tag_set() calls .init_request() of mmc_mq_ops,
	 * the host->can_dma_map_merge should be set before to get max_segs
	 * from mmc_get_max_segments().
	 */
	if (mmc_merge_capable(host) &&
	    host->max_segs < MMC_DMA_MAP_MERGE_SEGMENTS &&
	    dma_get_merge_boundary(mmc_dev(host)))
		host->can_dma_map_merge = 1;
	else
		host->can_dma_map_merge = 0;

	ret = blk_mq_alloc_tag_set(&mq->tag_set);
	if (ret)
		return ret;

	mq->queue = blk_mq_init_queue(&mq->tag_set);
	if (IS_ERR(mq->queue)) {
		ret = PTR_ERR(mq->queue);
		goto free_tag_set;
	}

	if (mmc_host_is_spi(host) && host->use_spi_crc)
		mq->queue->backing_dev_info->capabilities |=
			BDI_CAP_STABLE_WRITES;

	mq->queue->queuedata = mq;
	blk_queue_rq_timeout(mq->queue, 60 * HZ);

	mmc_setup_queue(mq, card);
	return 0;

free_tag_set:
	blk_mq_free_tag_set(&mq->tag_set);
	return ret;
}

void mmc_queue_suspend(struct mmc_queue *mq)
{
	blk_mq_quiesce_queue(mq->queue);

	/*
	 * The host remains claimed while there are outstanding requests, so
	 * simply claiming and releasing here ensures there are none.
	 */
	mmc_claim_host(mq->card->host);
	mmc_release_host(mq->card->host);
}

void mmc_queue_resume(struct mmc_queue *mq)
{
	blk_mq_unquiesce_queue(mq->queue);
}

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

	/*
	 * The legacy code handled the possibility of being suspended,
	 * so do that here too.
	 */
	if (blk_queue_quiesced(q))
		blk_mq_unquiesce_queue(q);

	blk_cleanup_queue(q);
	blk_mq_free_tag_set(&mq->tag_set);

	/*
	 * A request can be completed before the next request, potentially
	 * leaving a complete_work with nothing to do. Such a work item might
	 * still be queued at this point. Flush it.
	 */
	flush_work(&mq->complete_work);

	mq->card = NULL;
}

/*
 * 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)
{
	struct request *req = mmc_queue_req_to_req(mqrq);

	return blk_rq_map_sg(mq->queue, req, mqrq->sg);
}
Commit	Line	Data
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
1da177e4	2	/*
1da177e4	3	* Copyright (C) 2003 Russell King, All Rights Reserved.
98ac2162	4	* Copyright 2006-2007 Pierre Ossman
1da177e4	5	*/
5a0e3ad6	6	#include <linux/slab.h>
1da177e4 LT	7	#include <linux/module.h>
1da177e4 LT	8	#include <linux/blkdev.h>
83144186	9	#include <linux/freezer.h>
87598a2b	10	#include <linux/kthread.h>
45711f1a	11	#include <linux/scatterlist.h>
8e0cb8a1	12	#include <linux/dma-mapping.h>
3a6ffb3c	13	#include <linux/backing-dev.h>
1da177e4 LT	14
	15	#include <linux/mmc/card.h>
	16	#include <linux/mmc/host.h>
29eb7bd0	17
98ac2162	18	#include "queue.h"
29eb7bd0	19	#include "block.h"
55244c56	20	#include "core.h"
4facdde1	21	#include "card.h"
81196976	22	#include "host.h"
1da177e4	23
38c38cb7 YS	24	#define MMC_DMA_MAP_MERGE_SEGMENTS 512
38c38cb7 YS	25
1e8e55b6 AH	26	static inline bool mmc_cqe_dcmd_busy(struct mmc_queue *mq)
	27	{
	28	/* Allow only 1 DCMD at a time */
	29	return mq->in_flight[MMC_ISSUE_DCMD];
	30	}
	31
	32	void mmc_cqe_check_busy(struct mmc_queue *mq)
	33	{
	34	if ((mq->cqe_busy & MMC_CQE_DCMD_BUSY) && !mmc_cqe_dcmd_busy(mq))
	35	mq->cqe_busy &= ~MMC_CQE_DCMD_BUSY;
	36
	37	mq->cqe_busy &= ~MMC_CQE_QUEUE_FULL;
	38	}
	39
	40	static inline bool mmc_cqe_can_dcmd(struct mmc_host *host)
	41	{
	42	return host->caps2 & MMC_CAP2_CQE_DCMD;
	43	}
	44
15ff2946 CIK	45	static enum mmc_issue_type mmc_cqe_issue_type(struct mmc_host *host,
15ff2946 CIK	46	struct request *req)
1e8e55b6 AH	47	{
	48	switch (req_op(req)) {
	49	case REQ_OP_DRV_IN:
	50	case REQ_OP_DRV_OUT:
	51	case REQ_OP_DISCARD:
	52	case REQ_OP_SECURE_ERASE:
	53	return MMC_ISSUE_SYNC;
	54	case REQ_OP_FLUSH:
	55	return mmc_cqe_can_dcmd(host) ? MMC_ISSUE_DCMD : MMC_ISSUE_SYNC;
	56	default:
	57	return MMC_ISSUE_ASYNC;
	58	}
	59	}
	60
81196976 AH	61	enum mmc_issue_type mmc_issue_type(struct mmc_queue mq, struct request req)
81196976 AH	62	{
1e8e55b6 AH	63	struct mmc_host *host = mq->card->host;
1e8e55b6 AH	64
511ce378	65	if (mq->use_cqe && !host->hsq_enabled)
1e8e55b6 AH	66	return mmc_cqe_issue_type(host, req);
1e8e55b6 AH	67
81196976 AH	68	if (req_op(req) == REQ_OP_READ \|\| req_op(req) == REQ_OP_WRITE)
	69	return MMC_ISSUE_ASYNC;
	70
	71	return MMC_ISSUE_SYNC;
	72	}
	73
1e8e55b6 AH	74	static void __mmc_cqe_recovery_notifier(struct mmc_queue *mq)
	75	{
	76	if (!mq->recovery_needed) {
	77	mq->recovery_needed = true;
	78	schedule_work(&mq->recovery_work);
	79	}
	80	}
	81
	82	void mmc_cqe_recovery_notifier(struct mmc_request *mrq)
	83	{
	84	struct mmc_queue_req *mqrq = container_of(mrq, struct mmc_queue_req,
	85	brq.mrq);
	86	struct request *req = mmc_queue_req_to_req(mqrq);
	87	struct request_queue *q = req->q;
	88	struct mmc_queue *mq = q->queuedata;
	89	unsigned long flags;
	90
f5d72c5c	91	spin_lock_irqsave(&mq->lock, flags);
1e8e55b6	92	__mmc_cqe_recovery_notifier(mq);
f5d72c5c	93	spin_unlock_irqrestore(&mq->lock, flags);
1e8e55b6 AH	94	}
	95
	96	static enum blk_eh_timer_return mmc_cqe_timed_out(struct request *req)
	97	{
	98	struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
	99	struct mmc_request *mrq = &mqrq->brq.mrq;
	100	struct mmc_queue *mq = req->q->queuedata;
	101	struct mmc_host *host = mq->card->host;
	102	enum mmc_issue_type issue_type = mmc_issue_type(mq, req);
	103	bool recovery_needed = false;
	104
	105	switch (issue_type) {
	106	case MMC_ISSUE_ASYNC:
	107	case MMC_ISSUE_DCMD:
	108	if (host->cqe_ops->cqe_timeout(host, mrq, &recovery_needed)) {
	109	if (recovery_needed)
39a22f73	110	mmc_cqe_recovery_notifier(mrq);
1e8e55b6 AH	111	return BLK_EH_RESET_TIMER;
1e8e55b6 AH	112	}
c077dc5e	113	/* The request has gone already */
ad73d6fe	114	return BLK_EH_DONE;
1e8e55b6 AH	115	default:
	116	/* Timeout is handled by mmc core */
	117	return BLK_EH_RESET_TIMER;
	118	}
	119	}
	120
81196976 AH	121	static enum blk_eh_timer_return mmc_mq_timed_out(struct request *req,
	122	bool reserved)
	123	{
1e8e55b6 AH	124	struct request_queue *q = req->q;
1e8e55b6 AH	125	struct mmc_queue *mq = q->queuedata;
511ce378 BW	126	struct mmc_card *card = mq->card;
511ce378 BW	127	struct mmc_host *host = card->host;
1e8e55b6	128	unsigned long flags;
39a22f73	129	bool ignore_tout;
1e8e55b6	130
f5d72c5c	131	spin_lock_irqsave(&mq->lock, flags);
39a22f73	132	ignore_tout = mq->recovery_needed \|\| !mq->use_cqe \|\| host->hsq_enabled;
f5d72c5c	133	spin_unlock_irqrestore(&mq->lock, flags);
1e8e55b6	134
39a22f73	135	return ignore_tout ? BLK_EH_RESET_TIMER : mmc_cqe_timed_out(req);
1e8e55b6 AH	136	}
	137
	138	static void mmc_mq_recovery_handler(struct work_struct *work)
	139	{
	140	struct mmc_queue *mq = container_of(work, struct mmc_queue,
	141	recovery_work);
	142	struct request_queue *q = mq->queue;
511ce378	143	struct mmc_host *host = mq->card->host;
1e8e55b6 AH	144
	145	mmc_get_card(mq->card, &mq->ctx);
	146
	147	mq->in_recovery = true;
	148
511ce378	149	if (mq->use_cqe && !host->hsq_enabled)
10f21df4 AH	150	mmc_blk_cqe_recovery(mq);
	151	else
	152	mmc_blk_mq_recovery(mq);
1e8e55b6 AH	153
	154	mq->in_recovery = false;
	155
f5d72c5c	156	spin_lock_irq(&mq->lock);
1e8e55b6	157	mq->recovery_needed = false;
f5d72c5c	158	spin_unlock_irq(&mq->lock);
1e8e55b6	159
511ce378 BW	160	if (host->hsq_enabled)
	161	host->cqe_ops->cqe_recovery_finish(host);
	162
1e8e55b6 AH	163	mmc_put_card(mq->card, &mq->ctx);
	164
	165	blk_mq_run_hw_queues(q, true);
81196976 AH	166	}
81196976 AH	167
304419d8	168	static struct scatterlist *mmc_alloc_sg(int sg_len, gfp_t gfp)
97868a2b PF	169	{
	170	struct scatterlist *sg;
	171
304419d8	172	sg = kmalloc_array(sg_len, sizeof(*sg), gfp);
7b410d07	173	if (sg)
97868a2b	174	sg_init_table(sg, sg_len);
97868a2b PF	175
	176	return sg;
	177	}
	178
e056a1b5 AH	179	static void mmc_queue_setup_discard(struct request_queue *q,
	180	struct mmc_card *card)
	181	{
	182	unsigned max_discard;
	183
	184	max_discard = mmc_calc_max_discard(card);
	185	if (!max_discard)
	186	return;
	187
8b904b5b	188	blk_queue_flag_set(QUEUE_FLAG_DISCARD, q);
2bb4cd5c	189	blk_queue_max_discard_sectors(q, max_discard);
e056a1b5 AH	190	q->limits.discard_granularity = card->pref_erase << 9;
	191	/* granularity must not be greater than max. discard */
	192	if (card->pref_erase > max_discard)
	193	q->limits.discard_granularity = 0;
775a9362	194	if (mmc_can_secure_erase_trim(card))
8b904b5b	195	blk_queue_flag_set(QUEUE_FLAG_SECERASE, q);
e056a1b5 AH	196	}
e056a1b5 AH	197
38c38cb7 YS	198	static unsigned int mmc_get_max_segments(struct mmc_host *host)
	199	{
	200	return host->can_dma_map_merge ? MMC_DMA_MAP_MERGE_SEGMENTS :
	201	host->max_segs;
	202	}
	203
304419d8 LW	204	/**
	205	* mmc_init_request() - initialize the MMC-specific per-request data
	206	* @q: the request queue
	207	* @req: the request
	208	* @gfp: memory allocation policy
	209	*/
81196976 AH	210	static int __mmc_init_request(struct mmc_queue mq, struct request req,
81196976 AH	211	gfp_t gfp)
64e29e42	212	{
304419d8	213	struct mmc_queue_req *mq_rq = req_to_mmc_queue_req(req);
304419d8 LW	214	struct mmc_card *card = mq->card;
304419d8 LW	215	struct mmc_host *host = card->host;
64e29e42	216
38c38cb7	217	mq_rq->sg = mmc_alloc_sg(mmc_get_max_segments(host), gfp);
de3ee99b LW	218	if (!mq_rq->sg)
de3ee99b LW	219	return -ENOMEM;
64e29e42	220
c5bda0ca AH	221	return 0;
c5bda0ca AH	222	}
64e29e42	223
304419d8	224	static void mmc_exit_request(struct request_queue q, struct request req)
c5bda0ca	225	{
304419d8	226	struct mmc_queue_req *mq_rq = req_to_mmc_queue_req(req);
7b410d07	227
304419d8 LW	228	kfree(mq_rq->sg);
304419d8 LW	229	mq_rq->sg = NULL;
c09949cf AH	230	}
c09949cf AH	231
81196976 AH	232	static int mmc_mq_init_request(struct blk_mq_tag_set set, struct request req,
	233	unsigned int hctx_idx, unsigned int numa_node)
	234	{
	235	return __mmc_init_request(set->driver_data, req, GFP_KERNEL);
	236	}
	237
	238	static void mmc_mq_exit_request(struct blk_mq_tag_set set, struct request req,
	239	unsigned int hctx_idx)
	240	{
	241	struct mmc_queue *mq = set->driver_data;
	242
	243	mmc_exit_request(mq->queue, req);
	244	}
	245
81196976 AH	246	static blk_status_t mmc_mq_queue_rq(struct blk_mq_hw_ctx *hctx,
	247	const struct blk_mq_queue_data *bd)
	248	{
	249	struct request *req = bd->rq;
	250	struct request_queue *q = req->q;
	251	struct mmc_queue *mq = q->queuedata;
	252	struct mmc_card *card = mq->card;
1e8e55b6	253	struct mmc_host *host = card->host;
81196976 AH	254	enum mmc_issue_type issue_type;
81196976 AH	255	enum mmc_issued issued;
1e8e55b6	256	bool get_card, cqe_retune_ok;
81196976 AH	257	int ret;
	258
	259	if (mmc_card_removed(mq->card)) {
	260	req->rq_flags \|= RQF_QUIET;
	261	return BLK_STS_IOERR;
	262	}
	263
	264	issue_type = mmc_issue_type(mq, req);
	265
f5d72c5c	266	spin_lock_irq(&mq->lock);
81196976	267
26caddf2	268	if (mq->recovery_needed \|\| mq->busy) {
f5d72c5c	269	spin_unlock_irq(&mq->lock);
1e8e55b6 AH	270	return BLK_STS_RESOURCE;
	271	}
	272
81196976	273	switch (issue_type) {
1e8e55b6 AH	274	case MMC_ISSUE_DCMD:
	275	if (mmc_cqe_dcmd_busy(mq)) {
	276	mq->cqe_busy \|= MMC_CQE_DCMD_BUSY;
f5d72c5c	277	spin_unlock_irq(&mq->lock);
1e8e55b6 AH	278	return BLK_STS_RESOURCE;
	279	}
	280	break;
81196976	281	case MMC_ISSUE_ASYNC:
511ce378 BW	282	/*
	283	* For MMC host software queue, we only allow 2 requests in
	284	* flight to avoid a long latency.
	285	*/
	286	if (host->hsq_enabled && mq->in_flight[issue_type] > 2) {
	287	spin_unlock_irq(&mq->lock);
	288	return BLK_STS_RESOURCE;
	289	}
81196976 AH	290	break;
	291	default:
	292	/*
	293	* Timeouts are handled by mmc core, and we don't have a host
	294	* API to abort requests, so we can't handle the timeout anyway.
	295	* However, when the timeout happens, blk_mq_complete_request()
	296	* no longer works (to stop the request disappearing under us).
	297	* To avoid racing with that, set a large timeout.
	298	*/
	299	req->timeout = 600 * HZ;
	300	break;
	301	}
	302
26caddf2 AH	303	/* Parallel dispatch of requests is not supported at the moment */
	304	mq->busy = true;
	305
81196976 AH	306	mq->in_flight[issue_type] += 1;
81196976 AH	307	get_card = (mmc_tot_in_flight(mq) == 1);
1e8e55b6	308	cqe_retune_ok = (mmc_cqe_qcnt(mq) == 1);
81196976	309
f5d72c5c	310	spin_unlock_irq(&mq->lock);
81196976 AH	311
	312	if (!(req->rq_flags & RQF_DONTPREP)) {
	313	req_to_mmc_queue_req(req)->retries = 0;
	314	req->rq_flags \|= RQF_DONTPREP;
	315	}
	316
	317	if (get_card)
	318	mmc_get_card(card, &mq->ctx);
	319
1e8e55b6 AH	320	if (mq->use_cqe) {
	321	host->retune_now = host->need_retune && cqe_retune_ok &&
	322	!host->hold_retune;
	323	}
	324
81196976 AH	325	blk_mq_start_request(req);
	326
	327	issued = mmc_blk_mq_issue_rq(mq, req);
	328
	329	switch (issued) {
	330	case MMC_REQ_BUSY:
	331	ret = BLK_STS_RESOURCE;
	332	break;
	333	case MMC_REQ_FAILED_TO_START:
	334	ret = BLK_STS_IOERR;
	335	break;
	336	default:
	337	ret = BLK_STS_OK;
	338	break;
	339	}
	340
	341	if (issued != MMC_REQ_STARTED) {
	342	bool put_card = false;
	343
f5d72c5c	344	spin_lock_irq(&mq->lock);
81196976 AH	345	mq->in_flight[issue_type] -= 1;
	346	if (mmc_tot_in_flight(mq) == 0)
	347	put_card = true;
26caddf2	348	mq->busy = false;
f5d72c5c	349	spin_unlock_irq(&mq->lock);
81196976 AH	350	if (put_card)
81196976 AH	351	mmc_put_card(card, &mq->ctx);
26caddf2 AH	352	} else {
26caddf2 AH	353	WRITE_ONCE(mq->busy, false);
81196976 AH	354	}
	355
	356	return ret;
	357	}
	358
	359	static const struct blk_mq_ops mmc_mq_ops = {
	360	.queue_rq = mmc_mq_queue_rq,
	361	.init_request = mmc_mq_init_request,
	362	.exit_request = mmc_mq_exit_request,
	363	.complete = mmc_blk_mq_complete,
	364	.timeout = mmc_mq_timed_out,
	365	};
	366
c8b5fd03 AH	367	static void mmc_setup_queue(struct mmc_queue mq, struct mmc_card card)
	368	{
	369	struct mmc_host *host = card->host;
c53336c8	370	unsigned block_size = 512;
c8b5fd03	371
8b904b5b BVA	372	blk_queue_flag_set(QUEUE_FLAG_NONROT, mq->queue);
8b904b5b BVA	373	blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, mq->queue);
c8b5fd03 AH	374	if (mmc_can_erase(card))
	375	mmc_queue_setup_discard(mq->queue, card);
	376
7559d612 CH	377	if (!mmc_dev(host)->dma_mask \|\| !*mmc_dev(host)->dma_mask)
7559d612 CH	378	blk_queue_bounce_limit(mq->queue, BLK_BOUNCE_HIGH);
c8b5fd03 AH	379	blk_queue_max_hw_sectors(mq->queue,
c8b5fd03 AH	380	min(host->max_blk_count, host->max_req_size / 512));
38c38cb7 YS	381	if (host->can_dma_map_merge)
	382	WARN(!blk_queue_can_use_dma_map_merging(mq->queue,
	383	mmc_dev(host)),
	384	"merging was advertised but not possible");
	385	blk_queue_max_segments(mq->queue, mmc_get_max_segments(host));
c53336c8 ML	386
	387	if (mmc_card_mmc(card))
	388	block_size = card->ext_csd.data_sector_size;
	389
	390	blk_queue_logical_block_size(mq->queue, block_size);
38c38cb7 YS	391	/*
	392	* After blk_queue_can_use_dma_map_merging() was called with succeed,
	393	* since it calls blk_queue_virt_boundary(), the mmc should not call
	394	* both blk_queue_max_segment_size().
	395	*/
	396	if (!host->can_dma_map_merge)
	397	blk_queue_max_segment_size(mq->queue,
c53336c8	398	round_down(host->max_seg_size, block_size));
c8b5fd03	399
cf1db7fc CH	400	dma_set_max_seg_size(mmc_dev(host), queue_max_segment_size(mq->queue));
cf1db7fc CH	401
1e8e55b6	402	INIT_WORK(&mq->recovery_work, mmc_mq_recovery_handler);
81196976 AH	403	INIT_WORK(&mq->complete_work, mmc_blk_mq_complete_work);
	404
	405	mutex_init(&mq->complete_lock);
	406
	407	init_waitqueue_head(&mq->wait);
	408	}
	409
427b0034 YS	410	static inline bool mmc_merge_capable(struct mmc_host *host)
	411	{
	412	return host->caps2 & MMC_CAP2_MERGE_CAPABLE;
	413	}
	414
b061b326 CH	415	/* Set queue depth to get a reasonable value for q->nr_requests */
	416	#define MMC_QUEUE_DEPTH 64
	417
	418	/**
	419	* mmc_init_queue - initialise a queue structure.
	420	* @mq: mmc queue
	421	* @card: mmc card to attach this queue
b061b326 CH	422	*
	423	* Initialise a MMC card request queue.
	424	*/
f5d72c5c	425	int mmc_init_queue(struct mmc_queue mq, struct mmc_card card)
81196976	426	{
b061b326	427	struct mmc_host *host = card->host;
81196976 AH	428	int ret;
81196976 AH	429
b061b326 CH	430	mq->card = card;
b061b326 CH	431	mq->use_cqe = host->cqe_enabled;
f5d72c5c CH	432
f5d72c5c CH	433	spin_lock_init(&mq->lock);
b061b326	434
81196976	435	memset(&mq->tag_set, 0, sizeof(mq->tag_set));
b061b326 CH	436	mq->tag_set.ops = &mmc_mq_ops;
	437	/*
	438	* The queue depth for CQE must match the hardware because the request
	439	* tag is used to index the hardware queue.
	440	*/
511ce378	441	if (mq->use_cqe && !host->hsq_enabled)
b061b326 CH	442	mq->tag_set.queue_depth =
	443	min_t(int, card->ext_csd.cmdq_depth, host->cqe_qdepth);
	444	else
	445	mq->tag_set.queue_depth = MMC_QUEUE_DEPTH;
81196976	446	mq->tag_set.numa_node = NUMA_NO_NODE;
56d18f62	447	mq->tag_set.flags = BLK_MQ_F_SHOULD_MERGE \| BLK_MQ_F_BLOCKING;
81196976 AH	448	mq->tag_set.nr_hw_queues = 1;
	449	mq->tag_set.cmd_size = sizeof(struct mmc_queue_req);
	450	mq->tag_set.driver_data = mq;
	451
38c38cb7 YS	452	/*
	453	* Since blk_mq_alloc_tag_set() calls .init_request() of mmc_mq_ops,
	454	* the host->can_dma_map_merge should be set before to get max_segs
	455	* from mmc_get_max_segments().
	456	*/
427b0034 YS	457	if (mmc_merge_capable(host) &&
427b0034 YS	458	host->max_segs < MMC_DMA_MAP_MERGE_SEGMENTS &&
38c38cb7 YS	459	dma_get_merge_boundary(mmc_dev(host)))
	460	host->can_dma_map_merge = 1;
	461	else
	462	host->can_dma_map_merge = 0;
	463
81196976 AH	464	ret = blk_mq_alloc_tag_set(&mq->tag_set);
	465	if (ret)
	466	return ret;
	467
	468	mq->queue = blk_mq_init_queue(&mq->tag_set);
	469	if (IS_ERR(mq->queue)) {
	470	ret = PTR_ERR(mq->queue);
	471	goto free_tag_set;
	472	}
	473
3a6ffb3c AK	474	if (mmc_host_is_spi(host) && host->use_spi_crc)
	475	mq->queue->backing_dev_info->capabilities \|=
	476	BDI_CAP_STABLE_WRITES;
	477
81196976	478	mq->queue->queuedata = mq;
b061b326	479	blk_queue_rq_timeout(mq->queue, 60 * HZ);
81196976	480
b061b326	481	mmc_setup_queue(mq, card);
81196976 AH	482	return 0;
	483
	484	free_tag_set:
	485	blk_mq_free_tag_set(&mq->tag_set);
81196976 AH	486	return ret;
	487	}
	488
0fbfd125	489	void mmc_queue_suspend(struct mmc_queue *mq)
81196976 AH	490	{
	491	blk_mq_quiesce_queue(mq->queue);
	492
	493	/*
	494	* The host remains claimed while there are outstanding requests, so
	495	* simply claiming and releasing here ensures there are none.
	496	*/
	497	mmc_claim_host(mq->card->host);
	498	mmc_release_host(mq->card->host);
	499	}
	500
0fbfd125	501	void mmc_queue_resume(struct mmc_queue *mq)
81196976 AH	502	{
	503	blk_mq_unquiesce_queue(mq->queue);
	504	}
	505
1da177e4 LT	506	void mmc_cleanup_queue(struct mmc_queue *mq)
1da177e4 LT	507	{
165125e1	508	struct request_queue *q = mq->queue;
89b4e133	509
0fbfd125 AH	510	/*
	511	* The legacy code handled the possibility of being suspended,
	512	* so do that here too.
	513	*/
	514	if (blk_queue_quiesced(q))
	515	blk_mq_unquiesce_queue(q);
5fa83ce2	516
41e3efd0	517	blk_cleanup_queue(q);
43d8dabb	518	blk_mq_free_tag_set(&mq->tag_set);
41e3efd0	519
81196976 AH	520	/*
	521	* A request can be completed before the next request, potentially
	522	* leaving a complete_work with nothing to do. Such a work item might
	523	* still be queued at this point. Flush it.
	524	*/
	525	flush_work(&mq->complete_work);
	526
1da177e4 LT	527	mq->card = NULL;
1da177e4 LT	528	}
1da177e4	529
2ff1fa67 PO	530	/*
	531	* Prepare the sg list(s) to be handed of to the host driver
	532	*/
97868a2b	533	unsigned int mmc_queue_map_sg(struct mmc_queue mq, struct mmc_queue_req mqrq)
98ccf149	534	{
67e69d52	535	struct request *req = mmc_queue_req_to_req(mqrq);
98ccf149	536
de3ee99b	537	return blk_rq_map_sg(mq->queue, req, mqrq->sg);
98ccf149	538	}