525 lines
13 KiB
C
525 lines
13 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2003 Russell King, All Rights Reserved.
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* Copyright 2006-2007 Pierre Ossman
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*/
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/blkdev.h>
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#include <linux/freezer.h>
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#include <linux/scatterlist.h>
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#include <linux/dma-mapping.h>
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#include <linux/backing-dev.h>
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#include <linux/mmc/card.h>
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#include <linux/mmc/host.h>
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#include "queue.h"
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#include "block.h"
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#include "core.h"
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#include "card.h"
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#include "crypto.h"
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#include "host.h"
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#define MMC_DMA_MAP_MERGE_SEGMENTS 512
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static inline bool mmc_cqe_dcmd_busy(struct mmc_queue *mq)
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{
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/* Allow only 1 DCMD at a time */
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return mq->in_flight[MMC_ISSUE_DCMD];
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}
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void mmc_cqe_check_busy(struct mmc_queue *mq)
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{
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if ((mq->cqe_busy & MMC_CQE_DCMD_BUSY) && !mmc_cqe_dcmd_busy(mq))
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mq->cqe_busy &= ~MMC_CQE_DCMD_BUSY;
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}
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static inline bool mmc_cqe_can_dcmd(struct mmc_host *host)
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{
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return host->caps2 & MMC_CAP2_CQE_DCMD;
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}
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static enum mmc_issue_type mmc_cqe_issue_type(struct mmc_host *host,
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struct request *req)
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{
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switch (req_op(req)) {
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case REQ_OP_DRV_IN:
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case REQ_OP_DRV_OUT:
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case REQ_OP_DISCARD:
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case REQ_OP_SECURE_ERASE:
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case REQ_OP_WRITE_ZEROES:
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return MMC_ISSUE_SYNC;
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case REQ_OP_FLUSH:
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return mmc_cqe_can_dcmd(host) ? MMC_ISSUE_DCMD : MMC_ISSUE_SYNC;
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default:
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return MMC_ISSUE_ASYNC;
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}
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}
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enum mmc_issue_type mmc_issue_type(struct mmc_queue *mq, struct request *req)
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{
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struct mmc_host *host = mq->card->host;
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if (host->cqe_enabled && !host->hsq_enabled)
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return mmc_cqe_issue_type(host, req);
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if (req_op(req) == REQ_OP_READ || req_op(req) == REQ_OP_WRITE)
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return MMC_ISSUE_ASYNC;
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return MMC_ISSUE_SYNC;
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}
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static void __mmc_cqe_recovery_notifier(struct mmc_queue *mq)
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{
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if (!mq->recovery_needed) {
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mq->recovery_needed = true;
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schedule_work(&mq->recovery_work);
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}
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}
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void mmc_cqe_recovery_notifier(struct mmc_request *mrq)
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{
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struct mmc_queue_req *mqrq = container_of(mrq, struct mmc_queue_req,
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brq.mrq);
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struct request *req = mmc_queue_req_to_req(mqrq);
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struct request_queue *q = req->q;
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struct mmc_queue *mq = q->queuedata;
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unsigned long flags;
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spin_lock_irqsave(&mq->lock, flags);
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__mmc_cqe_recovery_notifier(mq);
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spin_unlock_irqrestore(&mq->lock, flags);
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}
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static enum blk_eh_timer_return mmc_cqe_timed_out(struct request *req)
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{
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struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
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struct mmc_request *mrq = &mqrq->brq.mrq;
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struct mmc_queue *mq = req->q->queuedata;
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struct mmc_host *host = mq->card->host;
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enum mmc_issue_type issue_type = mmc_issue_type(mq, req);
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bool recovery_needed = false;
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switch (issue_type) {
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case MMC_ISSUE_ASYNC:
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case MMC_ISSUE_DCMD:
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if (host->cqe_ops->cqe_timeout(host, mrq, &recovery_needed)) {
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if (recovery_needed)
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mmc_cqe_recovery_notifier(mrq);
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return BLK_EH_RESET_TIMER;
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}
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/* The request has gone already */
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return BLK_EH_DONE;
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default:
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/* Timeout is handled by mmc core */
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return BLK_EH_RESET_TIMER;
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}
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}
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static enum blk_eh_timer_return mmc_mq_timed_out(struct request *req)
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{
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struct request_queue *q = req->q;
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struct mmc_queue *mq = q->queuedata;
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struct mmc_card *card = mq->card;
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struct mmc_host *host = card->host;
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unsigned long flags;
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bool ignore_tout;
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spin_lock_irqsave(&mq->lock, flags);
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ignore_tout = mq->recovery_needed || !host->cqe_enabled || host->hsq_enabled;
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spin_unlock_irqrestore(&mq->lock, flags);
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return ignore_tout ? BLK_EH_RESET_TIMER : mmc_cqe_timed_out(req);
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}
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static void mmc_mq_recovery_handler(struct work_struct *work)
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{
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struct mmc_queue *mq = container_of(work, struct mmc_queue,
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recovery_work);
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struct request_queue *q = mq->queue;
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struct mmc_host *host = mq->card->host;
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mmc_get_card(mq->card, &mq->ctx);
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mq->in_recovery = true;
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if (host->cqe_enabled && !host->hsq_enabled)
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mmc_blk_cqe_recovery(mq);
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else
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mmc_blk_mq_recovery(mq);
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mq->in_recovery = false;
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spin_lock_irq(&mq->lock);
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mq->recovery_needed = false;
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spin_unlock_irq(&mq->lock);
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if (host->hsq_enabled)
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host->cqe_ops->cqe_recovery_finish(host);
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mmc_put_card(mq->card, &mq->ctx);
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blk_mq_run_hw_queues(q, true);
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}
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static struct scatterlist *mmc_alloc_sg(unsigned short sg_len, gfp_t gfp)
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{
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struct scatterlist *sg;
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sg = kmalloc_array(sg_len, sizeof(*sg), gfp);
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if (sg)
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sg_init_table(sg, sg_len);
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return sg;
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}
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static void mmc_queue_setup_discard(struct request_queue *q,
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struct mmc_card *card)
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{
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unsigned max_discard;
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max_discard = mmc_calc_max_discard(card);
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if (!max_discard)
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return;
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blk_queue_max_discard_sectors(q, max_discard);
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q->limits.discard_granularity = card->pref_erase << 9;
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/* granularity must not be greater than max. discard */
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if (card->pref_erase > max_discard)
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q->limits.discard_granularity = SECTOR_SIZE;
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if (mmc_can_secure_erase_trim(card))
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blk_queue_max_secure_erase_sectors(q, max_discard);
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if (mmc_can_trim(card) && card->erased_byte == 0)
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blk_queue_max_write_zeroes_sectors(q, max_discard);
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}
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static unsigned short mmc_get_max_segments(struct mmc_host *host)
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{
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return host->can_dma_map_merge ? MMC_DMA_MAP_MERGE_SEGMENTS :
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host->max_segs;
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}
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static int mmc_mq_init_request(struct blk_mq_tag_set *set, struct request *req,
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unsigned int hctx_idx, unsigned int numa_node)
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{
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struct mmc_queue_req *mq_rq = req_to_mmc_queue_req(req);
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struct mmc_queue *mq = set->driver_data;
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struct mmc_card *card = mq->card;
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struct mmc_host *host = card->host;
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mq_rq->sg = mmc_alloc_sg(mmc_get_max_segments(host), GFP_KERNEL);
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if (!mq_rq->sg)
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return -ENOMEM;
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return 0;
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}
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static void mmc_mq_exit_request(struct blk_mq_tag_set *set, struct request *req,
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unsigned int hctx_idx)
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{
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struct mmc_queue_req *mq_rq = req_to_mmc_queue_req(req);
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kfree(mq_rq->sg);
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mq_rq->sg = NULL;
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}
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static blk_status_t mmc_mq_queue_rq(struct blk_mq_hw_ctx *hctx,
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const struct blk_mq_queue_data *bd)
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{
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struct request *req = bd->rq;
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struct request_queue *q = req->q;
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struct mmc_queue *mq = q->queuedata;
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struct mmc_card *card = mq->card;
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struct mmc_host *host = card->host;
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enum mmc_issue_type issue_type;
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enum mmc_issued issued;
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bool get_card, cqe_retune_ok;
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blk_status_t ret;
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if (mmc_card_removed(mq->card)) {
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req->rq_flags |= RQF_QUIET;
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return BLK_STS_IOERR;
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}
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issue_type = mmc_issue_type(mq, req);
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spin_lock_irq(&mq->lock);
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if (mq->recovery_needed || mq->busy) {
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spin_unlock_irq(&mq->lock);
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return BLK_STS_RESOURCE;
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}
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switch (issue_type) {
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case MMC_ISSUE_DCMD:
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if (mmc_cqe_dcmd_busy(mq)) {
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mq->cqe_busy |= MMC_CQE_DCMD_BUSY;
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spin_unlock_irq(&mq->lock);
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return BLK_STS_RESOURCE;
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}
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break;
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case MMC_ISSUE_ASYNC:
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/*
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* For MMC host software queue, we only allow 2 requests in
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* flight to avoid a long latency.
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*/
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if (host->hsq_enabled && mq->in_flight[issue_type] > 2) {
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spin_unlock_irq(&mq->lock);
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return BLK_STS_RESOURCE;
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}
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break;
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default:
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/*
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* Timeouts are handled by mmc core, and we don't have a host
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* API to abort requests, so we can't handle the timeout anyway.
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* However, when the timeout happens, blk_mq_complete_request()
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* no longer works (to stop the request disappearing under us).
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* To avoid racing with that, set a large timeout.
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*/
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req->timeout = 600 * HZ;
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break;
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}
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/* Parallel dispatch of requests is not supported at the moment */
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mq->busy = true;
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mq->in_flight[issue_type] += 1;
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get_card = (mmc_tot_in_flight(mq) == 1);
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cqe_retune_ok = (mmc_cqe_qcnt(mq) == 1);
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spin_unlock_irq(&mq->lock);
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if (!(req->rq_flags & RQF_DONTPREP)) {
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req_to_mmc_queue_req(req)->retries = 0;
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req->rq_flags |= RQF_DONTPREP;
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}
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if (get_card)
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mmc_get_card(card, &mq->ctx);
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if (host->cqe_enabled) {
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host->retune_now = host->need_retune && cqe_retune_ok &&
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!host->hold_retune;
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}
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blk_mq_start_request(req);
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issued = mmc_blk_mq_issue_rq(mq, req);
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switch (issued) {
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case MMC_REQ_BUSY:
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ret = BLK_STS_RESOURCE;
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break;
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case MMC_REQ_FAILED_TO_START:
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ret = BLK_STS_IOERR;
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break;
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default:
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ret = BLK_STS_OK;
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break;
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}
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if (issued != MMC_REQ_STARTED) {
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bool put_card = false;
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spin_lock_irq(&mq->lock);
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mq->in_flight[issue_type] -= 1;
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if (mmc_tot_in_flight(mq) == 0)
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put_card = true;
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mq->busy = false;
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spin_unlock_irq(&mq->lock);
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if (put_card)
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mmc_put_card(card, &mq->ctx);
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} else {
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WRITE_ONCE(mq->busy, false);
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}
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return ret;
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}
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static const struct blk_mq_ops mmc_mq_ops = {
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.queue_rq = mmc_mq_queue_rq,
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.init_request = mmc_mq_init_request,
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.exit_request = mmc_mq_exit_request,
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.complete = mmc_blk_mq_complete,
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.timeout = mmc_mq_timed_out,
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};
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static void mmc_setup_queue(struct mmc_queue *mq, struct mmc_card *card)
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{
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struct mmc_host *host = card->host;
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unsigned block_size = 512;
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blk_queue_flag_set(QUEUE_FLAG_NONROT, mq->queue);
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blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, mq->queue);
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if (mmc_can_erase(card))
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mmc_queue_setup_discard(mq->queue, card);
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if (!mmc_dev(host)->dma_mask || !*mmc_dev(host)->dma_mask)
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blk_queue_bounce_limit(mq->queue, BLK_BOUNCE_HIGH);
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blk_queue_max_hw_sectors(mq->queue,
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min(host->max_blk_count, host->max_req_size / 512));
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if (host->can_dma_map_merge)
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WARN(!blk_queue_can_use_dma_map_merging(mq->queue,
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mmc_dev(host)),
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"merging was advertised but not possible");
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blk_queue_max_segments(mq->queue, mmc_get_max_segments(host));
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if (mmc_card_mmc(card) && card->ext_csd.data_sector_size) {
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block_size = card->ext_csd.data_sector_size;
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WARN_ON(block_size != 512 && block_size != 4096);
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}
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blk_queue_logical_block_size(mq->queue, block_size);
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/*
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* After blk_queue_can_use_dma_map_merging() was called with succeed,
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* since it calls blk_queue_virt_boundary(), the mmc should not call
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* both blk_queue_max_segment_size().
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*/
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if (!host->can_dma_map_merge)
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blk_queue_max_segment_size(mq->queue,
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round_down(host->max_seg_size, block_size));
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dma_set_max_seg_size(mmc_dev(host), queue_max_segment_size(mq->queue));
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INIT_WORK(&mq->recovery_work, mmc_mq_recovery_handler);
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INIT_WORK(&mq->complete_work, mmc_blk_mq_complete_work);
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mutex_init(&mq->complete_lock);
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init_waitqueue_head(&mq->wait);
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mmc_crypto_setup_queue(mq->queue, host);
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}
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static inline bool mmc_merge_capable(struct mmc_host *host)
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{
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return host->caps2 & MMC_CAP2_MERGE_CAPABLE;
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}
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/* Set queue depth to get a reasonable value for q->nr_requests */
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#define MMC_QUEUE_DEPTH 64
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/**
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* mmc_init_queue - initialise a queue structure.
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* @mq: mmc queue
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* @card: mmc card to attach this queue
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*
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* Initialise a MMC card request queue.
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*/
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struct gendisk *mmc_init_queue(struct mmc_queue *mq, struct mmc_card *card)
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{
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struct mmc_host *host = card->host;
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struct gendisk *disk;
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int ret;
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mq->card = card;
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spin_lock_init(&mq->lock);
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memset(&mq->tag_set, 0, sizeof(mq->tag_set));
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mq->tag_set.ops = &mmc_mq_ops;
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/*
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* The queue depth for CQE must match the hardware because the request
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* tag is used to index the hardware queue.
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*/
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if (host->cqe_enabled && !host->hsq_enabled)
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mq->tag_set.queue_depth =
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min_t(int, card->ext_csd.cmdq_depth, host->cqe_qdepth);
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else
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mq->tag_set.queue_depth = MMC_QUEUE_DEPTH;
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mq->tag_set.numa_node = NUMA_NO_NODE;
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mq->tag_set.flags = BLK_MQ_F_SHOULD_MERGE | BLK_MQ_F_BLOCKING;
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mq->tag_set.nr_hw_queues = 1;
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mq->tag_set.cmd_size = sizeof(struct mmc_queue_req);
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mq->tag_set.driver_data = mq;
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/*
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* Since blk_mq_alloc_tag_set() calls .init_request() of mmc_mq_ops,
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* the host->can_dma_map_merge should be set before to get max_segs
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* from mmc_get_max_segments().
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*/
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if (mmc_merge_capable(host) &&
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host->max_segs < MMC_DMA_MAP_MERGE_SEGMENTS &&
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dma_get_merge_boundary(mmc_dev(host)))
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host->can_dma_map_merge = 1;
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else
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host->can_dma_map_merge = 0;
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ret = blk_mq_alloc_tag_set(&mq->tag_set);
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if (ret)
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return ERR_PTR(ret);
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disk = blk_mq_alloc_disk(&mq->tag_set, mq);
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if (IS_ERR(disk)) {
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blk_mq_free_tag_set(&mq->tag_set);
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return disk;
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}
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mq->queue = disk->queue;
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if (mmc_host_is_spi(host) && host->use_spi_crc)
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blk_queue_flag_set(QUEUE_FLAG_STABLE_WRITES, mq->queue);
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blk_queue_rq_timeout(mq->queue, 60 * HZ);
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mmc_setup_queue(mq, card);
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return disk;
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}
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void mmc_queue_suspend(struct mmc_queue *mq)
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{
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blk_mq_quiesce_queue(mq->queue);
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/*
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* The host remains claimed while there are outstanding requests, so
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* simply claiming and releasing here ensures there are none.
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*/
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mmc_claim_host(mq->card->host);
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mmc_release_host(mq->card->host);
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}
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void mmc_queue_resume(struct mmc_queue *mq)
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{
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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);
|
|
}
|