[linux-2.6-block.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/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 "crypto.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;
}

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:
	case REQ_OP_WRITE_ZEROES:
		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 (host->cqe_enabled && !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)
{
	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 || !host->cqe_enabled || 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 (host->cqe_enabled && !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(unsigned short 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 mmc_card *card,
		struct queue_limits *lim)
{
	unsigned max_discard;

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

	lim->max_hw_discard_sectors = max_discard;
	if (mmc_can_secure_erase_trim(card))
		lim->max_secure_erase_sectors = max_discard;
	if (mmc_can_trim(card) && card->erased_byte == 0)
		lim->max_write_zeroes_sectors = max_discard;

	/* granularity must not be greater than max. discard */
	if (card->pref_erase > max_discard)
		lim->discard_granularity = SECTOR_SIZE;
	else
		lim->discard_granularity = card->pref_erase << 9;
}

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

static int mmc_mq_init_request(struct blk_mq_tag_set *set, struct request *req,
			       unsigned int hctx_idx, unsigned int numa_node)
{
	struct mmc_queue_req *mq_rq = req_to_mmc_queue_req(req);
	struct mmc_queue *mq = set->driver_data;
	struct mmc_card *card = mq->card;
	struct mmc_host *host = card->host;

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

	return 0;
}

static void mmc_mq_exit_request(struct blk_mq_tag_set *set, struct request *req,
				unsigned int hctx_idx)
{
	struct mmc_queue_req *mq_rq = req_to_mmc_queue_req(req);

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

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;
	blk_status_t 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:
		if (host->hsq_enabled && mq->in_flight[issue_type] > host->hsq_depth) {
			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 (host->cqe_enabled) {
		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 struct gendisk *mmc_alloc_disk(struct mmc_queue *mq,
		struct mmc_card *card)
{
	struct mmc_host *host = card->host;
	struct queue_limits lim = { };
	struct gendisk *disk;

	if (mmc_can_erase(card))
		mmc_queue_setup_discard(card, &lim);

	if (!mmc_dev(host)->dma_mask || !*mmc_dev(host)->dma_mask)
		lim.bounce = BLK_BOUNCE_HIGH;

	lim.max_hw_sectors = min(host->max_blk_count, host->max_req_size / 512);

	if (mmc_card_mmc(card) && card->ext_csd.data_sector_size)
		lim.logical_block_size = card->ext_csd.data_sector_size;
	else
		lim.logical_block_size = 512;

	WARN_ON_ONCE(lim.logical_block_size != 512 &&
		     lim.logical_block_size != 4096);

	/*
	 * Setting a virt_boundary implicity sets a max_segment_size, so try
	 * to set the hardware one here.
	 */
	if (host->can_dma_map_merge) {
		lim.virt_boundary_mask = dma_get_merge_boundary(mmc_dev(host));
		lim.max_segments = MMC_DMA_MAP_MERGE_SEGMENTS;
	} else {
		lim.max_segment_size =
			round_down(host->max_seg_size, lim.logical_block_size);
		lim.max_segments = host->max_segs;
	}

	disk = blk_mq_alloc_disk(&mq->tag_set, &lim, mq);
	if (IS_ERR(disk))
		return disk;
	mq->queue = disk->queue;

	if (mmc_host_is_spi(host) && host->use_spi_crc)
		blk_queue_flag_set(QUEUE_FLAG_STABLE_WRITES, mq->queue);
	blk_queue_rq_timeout(mq->queue, 60 * HZ);

	blk_queue_flag_set(QUEUE_FLAG_NONROT, mq->queue);
	blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, mq->queue);

	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);

	mmc_crypto_setup_queue(mq->queue, host);
	return disk;
}

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.
 */
struct gendisk *mmc_init_queue(struct mmc_queue *mq, struct mmc_card *card)
{
	struct mmc_host *host = card->host;
	struct gendisk *disk;
	int ret;

	mq->card = card;
	
	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 (host->cqe_enabled && !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 ERR_PTR(ret);
		

	disk = mmc_alloc_disk(mq, card);
	if (IS_ERR(disk))
		blk_mq_free_tag_set(&mq->tag_set);
	return disk;
}

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);

	/*
	 * If the recovery completes the last (and only remaining) request in
	 * the queue, and the card has been removed, we could end up here with
	 * the recovery not quite finished yet, so cancel it.
	 */
	cancel_work_sync(&mq->recovery_work);

	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>
45711f1a	10	#include <linux/scatterlist.h>
8e0cb8a1	11	#include <linux/dma-mapping.h>
3a6ffb3c	12	#include <linux/backing-dev.h>
1da177e4 LT	13
	14	#include <linux/mmc/card.h>
	15	#include <linux/mmc/host.h>
29eb7bd0	16
98ac2162	17	#include "queue.h"
29eb7bd0	18	#include "block.h"
55244c56	19	#include "core.h"
4facdde1	20	#include "card.h"
93f1c150	21	#include "crypto.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;
1e8e55b6 AH	36	}
	37
	38	static inline bool mmc_cqe_can_dcmd(struct mmc_host *host)
	39	{
	40	return host->caps2 & MMC_CAP2_CQE_DCMD;
	41	}
	42
15ff2946 CIK	43	static enum mmc_issue_type mmc_cqe_issue_type(struct mmc_host *host,
15ff2946 CIK	44	struct request *req)
1e8e55b6 AH	45	{
	46	switch (req_op(req)) {
	47	case REQ_OP_DRV_IN:
	48	case REQ_OP_DRV_OUT:
	49	case REQ_OP_DISCARD:
	50	case REQ_OP_SECURE_ERASE:
028822b7	51	case REQ_OP_WRITE_ZEROES:
1e8e55b6 AH	52	return MMC_ISSUE_SYNC;
	53	case REQ_OP_FLUSH:
	54	return mmc_cqe_can_dcmd(host) ? MMC_ISSUE_DCMD : MMC_ISSUE_SYNC;
	55	default:
	56	return MMC_ISSUE_ASYNC;
	57	}
	58	}
	59
81196976 AH	60	enum mmc_issue_type mmc_issue_type(struct mmc_queue mq, struct request req)
81196976 AH	61	{
1e8e55b6 AH	62	struct mmc_host *host = mq->card->host;
1e8e55b6 AH	63
407a1c57	64	if (host->cqe_enabled && !host->hsq_enabled)
1e8e55b6 AH	65	return mmc_cqe_issue_type(host, req);
1e8e55b6 AH	66
81196976 AH	67	if (req_op(req) == REQ_OP_READ \|\| req_op(req) == REQ_OP_WRITE)
	68	return MMC_ISSUE_ASYNC;
	69
	70	return MMC_ISSUE_SYNC;
	71	}
	72
1e8e55b6 AH	73	static void __mmc_cqe_recovery_notifier(struct mmc_queue *mq)
	74	{
	75	if (!mq->recovery_needed) {
	76	mq->recovery_needed = true;
	77	schedule_work(&mq->recovery_work);
	78	}
	79	}
	80
	81	void mmc_cqe_recovery_notifier(struct mmc_request *mrq)
	82	{
	83	struct mmc_queue_req *mqrq = container_of(mrq, struct mmc_queue_req,
	84	brq.mrq);
	85	struct request *req = mmc_queue_req_to_req(mqrq);
	86	struct request_queue *q = req->q;
	87	struct mmc_queue *mq = q->queuedata;
	88	unsigned long flags;
	89
f5d72c5c	90	spin_lock_irqsave(&mq->lock, flags);
1e8e55b6	91	__mmc_cqe_recovery_notifier(mq);
f5d72c5c	92	spin_unlock_irqrestore(&mq->lock, flags);
1e8e55b6 AH	93	}
	94
	95	static enum blk_eh_timer_return mmc_cqe_timed_out(struct request *req)
	96	{
	97	struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
	98	struct mmc_request *mrq = &mqrq->brq.mrq;
	99	struct mmc_queue *mq = req->q->queuedata;
	100	struct mmc_host *host = mq->card->host;
	101	enum mmc_issue_type issue_type = mmc_issue_type(mq, req);
	102	bool recovery_needed = false;
	103
	104	switch (issue_type) {
	105	case MMC_ISSUE_ASYNC:
	106	case MMC_ISSUE_DCMD:
	107	if (host->cqe_ops->cqe_timeout(host, mrq, &recovery_needed)) {
	108	if (recovery_needed)
39a22f73	109	mmc_cqe_recovery_notifier(mrq);
1e8e55b6 AH	110	return BLK_EH_RESET_TIMER;
1e8e55b6 AH	111	}
c077dc5e	112	/* The request has gone already */
ad73d6fe	113	return BLK_EH_DONE;
1e8e55b6 AH	114	default:
	115	/* Timeout is handled by mmc core */
	116	return BLK_EH_RESET_TIMER;
	117	}
	118	}
	119
9bdb4833	120	static enum blk_eh_timer_return mmc_mq_timed_out(struct request *req)
81196976	121	{
1e8e55b6 AH	122	struct request_queue *q = req->q;
1e8e55b6 AH	123	struct mmc_queue *mq = q->queuedata;
511ce378 BW	124	struct mmc_card *card = mq->card;
511ce378 BW	125	struct mmc_host *host = card->host;
1e8e55b6	126	unsigned long flags;
39a22f73	127	bool ignore_tout;
1e8e55b6	128
f5d72c5c	129	spin_lock_irqsave(&mq->lock, flags);
407a1c57	130	ignore_tout = mq->recovery_needed \|\| !host->cqe_enabled \|\| host->hsq_enabled;
f5d72c5c	131	spin_unlock_irqrestore(&mq->lock, flags);
1e8e55b6	132
39a22f73	133	return ignore_tout ? BLK_EH_RESET_TIMER : mmc_cqe_timed_out(req);
1e8e55b6 AH	134	}
	135
	136	static void mmc_mq_recovery_handler(struct work_struct *work)
	137	{
	138	struct mmc_queue *mq = container_of(work, struct mmc_queue,
	139	recovery_work);
	140	struct request_queue *q = mq->queue;
511ce378	141	struct mmc_host *host = mq->card->host;
1e8e55b6 AH	142
	143	mmc_get_card(mq->card, &mq->ctx);
	144
	145	mq->in_recovery = true;
	146
407a1c57	147	if (host->cqe_enabled && !host->hsq_enabled)
10f21df4 AH	148	mmc_blk_cqe_recovery(mq);
	149	else
	150	mmc_blk_mq_recovery(mq);
1e8e55b6 AH	151
	152	mq->in_recovery = false;
	153
f5d72c5c	154	spin_lock_irq(&mq->lock);
1e8e55b6	155	mq->recovery_needed = false;
f5d72c5c	156	spin_unlock_irq(&mq->lock);
1e8e55b6	157
511ce378 BW	158	if (host->hsq_enabled)
	159	host->cqe_ops->cqe_recovery_finish(host);
	160
1e8e55b6 AH	161	mmc_put_card(mq->card, &mq->ctx);
	162
	163	blk_mq_run_hw_queues(q, true);
81196976 AH	164	}
81196976 AH	165
f6f60707	166	static struct scatterlist *mmc_alloc_sg(unsigned short sg_len, gfp_t gfp)
97868a2b PF	167	{
	168	struct scatterlist *sg;
	169
304419d8	170	sg = kmalloc_array(sg_len, sizeof(*sg), gfp);
7b410d07	171	if (sg)
97868a2b	172	sg_init_table(sg, sg_len);
97868a2b PF	173
	174	return sg;
	175	}
	176
616f8766 CH	177	static void mmc_queue_setup_discard(struct mmc_card *card,
616f8766 CH	178	struct queue_limits *lim)
e056a1b5 AH	179	{
	180	unsigned max_discard;
	181
	182	max_discard = mmc_calc_max_discard(card);
	183	if (!max_discard)
	184	return;
	185
616f8766	186	lim->max_hw_discard_sectors = max_discard;
775a9362	187	if (mmc_can_secure_erase_trim(card))
616f8766	188	lim->max_secure_erase_sectors = max_discard;
f7b6fc32	189	if (mmc_can_trim(card) && card->erased_byte == 0)
616f8766 CH	190	lim->max_write_zeroes_sectors = max_discard;
	191
	192	/* granularity must not be greater than max. discard */
	193	if (card->pref_erase > max_discard)
	194	lim->discard_granularity = SECTOR_SIZE;
	195	else
	196	lim->discard_granularity = card->pref_erase << 9;
e056a1b5 AH	197	}
e056a1b5 AH	198
f6f60707	199	static unsigned short mmc_get_max_segments(struct mmc_host *host)
38c38cb7 YS	200	{
	201	return host->can_dma_map_merge ? MMC_DMA_MAP_MERGE_SEGMENTS :
	202	host->max_segs;
	203	}
	204
f80c8e68 CL	205	static int mmc_mq_init_request(struct blk_mq_tag_set set, struct request req,
f80c8e68 CL	206	unsigned int hctx_idx, unsigned int numa_node)
64e29e42	207	{
304419d8	208	struct mmc_queue_req *mq_rq = req_to_mmc_queue_req(req);
f80c8e68	209	struct mmc_queue *mq = set->driver_data;
304419d8 LW	210	struct mmc_card *card = mq->card;
304419d8 LW	211	struct mmc_host *host = card->host;
64e29e42	212
f80c8e68	213	mq_rq->sg = mmc_alloc_sg(mmc_get_max_segments(host), GFP_KERNEL);
de3ee99b LW	214	if (!mq_rq->sg)
de3ee99b LW	215	return -ENOMEM;
64e29e42	216
c5bda0ca AH	217	return 0;
c5bda0ca AH	218	}
64e29e42	219
f80c8e68 CL	220	static void mmc_mq_exit_request(struct blk_mq_tag_set set, struct request req,
f80c8e68 CL	221	unsigned int hctx_idx)
c5bda0ca	222	{
304419d8	223	struct mmc_queue_req *mq_rq = req_to_mmc_queue_req(req);
7b410d07	224
304419d8 LW	225	kfree(mq_rq->sg);
304419d8 LW	226	mq_rq->sg = NULL;
c09949cf AH	227	}
c09949cf AH	228
81196976 AH	229	static blk_status_t mmc_mq_queue_rq(struct blk_mq_hw_ctx *hctx,
	230	const struct blk_mq_queue_data *bd)
	231	{
	232	struct request *req = bd->rq;
	233	struct request_queue *q = req->q;
	234	struct mmc_queue *mq = q->queuedata;
	235	struct mmc_card *card = mq->card;
1e8e55b6	236	struct mmc_host *host = card->host;
81196976 AH	237	enum mmc_issue_type issue_type;
81196976 AH	238	enum mmc_issued issued;
1e8e55b6	239	bool get_card, cqe_retune_ok;
1ccaa1bd	240	blk_status_t ret;
81196976 AH	241
	242	if (mmc_card_removed(mq->card)) {
	243	req->rq_flags \|= RQF_QUIET;
	244	return BLK_STS_IOERR;
	245	}
	246
	247	issue_type = mmc_issue_type(mq, req);
	248
f5d72c5c	249	spin_lock_irq(&mq->lock);
81196976	250
26caddf2	251	if (mq->recovery_needed \|\| mq->busy) {
f5d72c5c	252	spin_unlock_irq(&mq->lock);
1e8e55b6 AH	253	return BLK_STS_RESOURCE;
	254	}
	255
81196976	256	switch (issue_type) {
1e8e55b6 AH	257	case MMC_ISSUE_DCMD:
	258	if (mmc_cqe_dcmd_busy(mq)) {
	259	mq->cqe_busy \|= MMC_CQE_DCMD_BUSY;
f5d72c5c	260	spin_unlock_irq(&mq->lock);
1e8e55b6 AH	261	return BLK_STS_RESOURCE;
	262	}
	263	break;
81196976	264	case MMC_ISSUE_ASYNC:
2e2b5479	265	if (host->hsq_enabled && mq->in_flight[issue_type] > host->hsq_depth) {
511ce378 BW	266	spin_unlock_irq(&mq->lock);
	267	return BLK_STS_RESOURCE;
	268	}
81196976 AH	269	break;
	270	default:
	271	/*
	272	* Timeouts are handled by mmc core, and we don't have a host
	273	* API to abort requests, so we can't handle the timeout anyway.
	274	* However, when the timeout happens, blk_mq_complete_request()
	275	* no longer works (to stop the request disappearing under us).
	276	* To avoid racing with that, set a large timeout.
	277	*/
	278	req->timeout = 600 * HZ;
	279	break;
	280	}
	281
26caddf2 AH	282	/* Parallel dispatch of requests is not supported at the moment */
	283	mq->busy = true;
	284
81196976 AH	285	mq->in_flight[issue_type] += 1;
81196976 AH	286	get_card = (mmc_tot_in_flight(mq) == 1);
1e8e55b6	287	cqe_retune_ok = (mmc_cqe_qcnt(mq) == 1);
81196976	288
f5d72c5c	289	spin_unlock_irq(&mq->lock);
81196976 AH	290
	291	if (!(req->rq_flags & RQF_DONTPREP)) {
	292	req_to_mmc_queue_req(req)->retries = 0;
	293	req->rq_flags \|= RQF_DONTPREP;
	294	}
	295
	296	if (get_card)
	297	mmc_get_card(card, &mq->ctx);
	298
407a1c57	299	if (host->cqe_enabled) {
1e8e55b6 AH	300	host->retune_now = host->need_retune && cqe_retune_ok &&
	301	!host->hold_retune;
	302	}
	303
81196976 AH	304	blk_mq_start_request(req);
	305
	306	issued = mmc_blk_mq_issue_rq(mq, req);
	307
	308	switch (issued) {
	309	case MMC_REQ_BUSY:
	310	ret = BLK_STS_RESOURCE;
	311	break;
	312	case MMC_REQ_FAILED_TO_START:
	313	ret = BLK_STS_IOERR;
	314	break;
	315	default:
	316	ret = BLK_STS_OK;
	317	break;
	318	}
	319
	320	if (issued != MMC_REQ_STARTED) {
	321	bool put_card = false;
	322
f5d72c5c	323	spin_lock_irq(&mq->lock);
81196976 AH	324	mq->in_flight[issue_type] -= 1;
	325	if (mmc_tot_in_flight(mq) == 0)
	326	put_card = true;
26caddf2	327	mq->busy = false;
f5d72c5c	328	spin_unlock_irq(&mq->lock);
81196976 AH	329	if (put_card)
81196976 AH	330	mmc_put_card(card, &mq->ctx);
26caddf2 AH	331	} else {
26caddf2 AH	332	WRITE_ONCE(mq->busy, false);
81196976 AH	333	}
	334
	335	return ret;
	336	}
	337
	338	static const struct blk_mq_ops mmc_mq_ops = {
	339	.queue_rq = mmc_mq_queue_rq,
	340	.init_request = mmc_mq_init_request,
	341	.exit_request = mmc_mq_exit_request,
	342	.complete = mmc_blk_mq_complete,
	343	.timeout = mmc_mq_timed_out,
	344	};
	345
616f8766 CH	346	static struct gendisk mmc_alloc_disk(struct mmc_queue mq,
616f8766 CH	347	struct mmc_card *card)
c8b5fd03 AH	348	{
c8b5fd03 AH	349	struct mmc_host *host = card->host;
616f8766 CH	350	struct queue_limits lim = { };
616f8766 CH	351	struct gendisk *disk;
c8b5fd03	352
c8b5fd03	353	if (mmc_can_erase(card))
616f8766	354	mmc_queue_setup_discard(card, &lim);
c8b5fd03	355
7559d612	356	if (!mmc_dev(host)->dma_mask \|\| !*mmc_dev(host)->dma_mask)
616f8766 CH	357	lim.bounce = BLK_BOUNCE_HIGH;
	358
	359	lim.max_hw_sectors = min(host->max_blk_count, host->max_req_size / 512);
	360
	361	if (mmc_card_mmc(card) && card->ext_csd.data_sector_size)
	362	lim.logical_block_size = card->ext_csd.data_sector_size;
	363	else
	364	lim.logical_block_size = 512;
	365
	366	WARN_ON_ONCE(lim.logical_block_size != 512 &&
	367	lim.logical_block_size != 4096);
c53336c8	368
38c38cb7	369	/*
616f8766 CH	370	* Setting a virt_boundary implicity sets a max_segment_size, so try
616f8766 CH	371	* to set the hardware one here.
38c38cb7	372	*/
616f8766 CH	373	if (host->can_dma_map_merge) {
	374	lim.virt_boundary_mask = dma_get_merge_boundary(mmc_dev(host));
	375	lim.max_segments = MMC_DMA_MAP_MERGE_SEGMENTS;
	376	} else {
	377	lim.max_segment_size =
	378	round_down(host->max_seg_size, lim.logical_block_size);
	379	lim.max_segments = host->max_segs;
	380	}
	381
	382	disk = blk_mq_alloc_disk(&mq->tag_set, &lim, mq);
	383	if (IS_ERR(disk))
	384	return disk;
	385	mq->queue = disk->queue;
	386
	387	if (mmc_host_is_spi(host) && host->use_spi_crc)
	388	blk_queue_flag_set(QUEUE_FLAG_STABLE_WRITES, mq->queue);
	389	blk_queue_rq_timeout(mq->queue, 60 * HZ);
	390
	391	blk_queue_flag_set(QUEUE_FLAG_NONROT, mq->queue);
	392	blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, mq->queue);
c8b5fd03	393
cf1db7fc CH	394	dma_set_max_seg_size(mmc_dev(host), queue_max_segment_size(mq->queue));
cf1db7fc CH	395
1e8e55b6	396	INIT_WORK(&mq->recovery_work, mmc_mq_recovery_handler);
81196976 AH	397	INIT_WORK(&mq->complete_work, mmc_blk_mq_complete_work);
	398
	399	mutex_init(&mq->complete_lock);
	400
	401	init_waitqueue_head(&mq->wait);
93f1c150 EB	402
93f1c150 EB	403	mmc_crypto_setup_queue(mq->queue, host);
616f8766	404	return disk;
81196976 AH	405	}
81196976 AH	406
427b0034 YS	407	static inline bool mmc_merge_capable(struct mmc_host *host)
	408	{
	409	return host->caps2 & MMC_CAP2_MERGE_CAPABLE;
	410	}
	411
b061b326 CH	412	/* Set queue depth to get a reasonable value for q->nr_requests */
	413	#define MMC_QUEUE_DEPTH 64
	414
	415	/**
	416	* mmc_init_queue - initialise a queue structure.
	417	* @mq: mmc queue
	418	* @card: mmc card to attach this queue
b061b326 CH	419	*
	420	* Initialise a MMC card request queue.
	421	*/
607d968a	422	struct gendisk mmc_init_queue(struct mmc_queue mq, struct mmc_card *card)
81196976	423	{
b061b326	424	struct mmc_host *host = card->host;
607d968a	425	struct gendisk *disk;
81196976 AH	426	int ret;
81196976 AH	427
b061b326	428	mq->card = card;
f5d72c5c CH	429
f5d72c5c CH	430	spin_lock_init(&mq->lock);
b061b326	431
81196976	432	memset(&mq->tag_set, 0, sizeof(mq->tag_set));
b061b326 CH	433	mq->tag_set.ops = &mmc_mq_ops;
	434	/*
	435	* The queue depth for CQE must match the hardware because the request
	436	* tag is used to index the hardware queue.
	437	*/
407a1c57	438	if (host->cqe_enabled && !host->hsq_enabled)
b061b326 CH	439	mq->tag_set.queue_depth =
	440	min_t(int, card->ext_csd.cmdq_depth, host->cqe_qdepth);
	441	else
	442	mq->tag_set.queue_depth = MMC_QUEUE_DEPTH;
81196976	443	mq->tag_set.numa_node = NUMA_NO_NODE;
56d18f62	444	mq->tag_set.flags = BLK_MQ_F_SHOULD_MERGE \| BLK_MQ_F_BLOCKING;
81196976 AH	445	mq->tag_set.nr_hw_queues = 1;
	446	mq->tag_set.cmd_size = sizeof(struct mmc_queue_req);
	447	mq->tag_set.driver_data = mq;
	448
38c38cb7 YS	449	/*
	450	* Since blk_mq_alloc_tag_set() calls .init_request() of mmc_mq_ops,
	451	* the host->can_dma_map_merge should be set before to get max_segs
	452	* from mmc_get_max_segments().
	453	*/
427b0034 YS	454	if (mmc_merge_capable(host) &&
427b0034 YS	455	host->max_segs < MMC_DMA_MAP_MERGE_SEGMENTS &&
38c38cb7 YS	456	dma_get_merge_boundary(mmc_dev(host)))
	457	host->can_dma_map_merge = 1;
	458	else
	459	host->can_dma_map_merge = 0;
	460
81196976 AH	461	ret = blk_mq_alloc_tag_set(&mq->tag_set);
81196976 AH	462	if (ret)
607d968a CH	463	return ERR_PTR(ret);
607d968a CH	464
81196976	465
616f8766 CH	466	disk = mmc_alloc_disk(mq, card);
616f8766 CH	467	if (IS_ERR(disk))
607d968a	468	blk_mq_free_tag_set(&mq->tag_set);
607d968a	469	return disk;
81196976 AH	470	}
81196976 AH	471
0fbfd125	472	void mmc_queue_suspend(struct mmc_queue *mq)
81196976 AH	473	{
	474	blk_mq_quiesce_queue(mq->queue);
	475
	476	/*
	477	* The host remains claimed while there are outstanding requests, so
	478	* simply claiming and releasing here ensures there are none.
	479	*/
	480	mmc_claim_host(mq->card->host);
	481	mmc_release_host(mq->card->host);
	482	}
	483
0fbfd125	484	void mmc_queue_resume(struct mmc_queue *mq)
81196976 AH	485	{
	486	blk_mq_unquiesce_queue(mq->queue);
	487	}
	488
1da177e4 LT	489	void mmc_cleanup_queue(struct mmc_queue *mq)
1da177e4 LT	490	{
165125e1	491	struct request_queue *q = mq->queue;
89b4e133	492
0fbfd125 AH	493	/*
	494	* The legacy code handled the possibility of being suspended,
	495	* so do that here too.
	496	*/
	497	if (blk_queue_quiesced(q))
	498	blk_mq_unquiesce_queue(q);
5fa83ce2	499
339e3eb1 CL	500	/*
	501	* If the recovery completes the last (and only remaining) request in
	502	* the queue, and the card has been removed, we could end up here with
	503	* the recovery not quite finished yet, so cancel it.
	504	*/
	505	cancel_work_sync(&mq->recovery_work);
	506
43d8dabb	507	blk_mq_free_tag_set(&mq->tag_set);
41e3efd0	508
81196976 AH	509	/*
	510	* A request can be completed before the next request, potentially
	511	* leaving a complete_work with nothing to do. Such a work item might
	512	* still be queued at this point. Flush it.
	513	*/
	514	flush_work(&mq->complete_work);
	515
1da177e4 LT	516	mq->card = NULL;
1da177e4 LT	517	}
1da177e4	518
2ff1fa67 PO	519	/*
	520	* Prepare the sg list(s) to be handed of to the host driver
	521	*/
97868a2b	522	unsigned int mmc_queue_map_sg(struct mmc_queue mq, struct mmc_queue_req mqrq)
98ccf149	523	{
67e69d52	524	struct request *req = mmc_queue_req_to_req(mqrq);
98ccf149	525
de3ee99b	526	return blk_rq_map_sg(mq->queue, req, mqrq->sg);
98ccf149	527	}