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26caddf274
The mmc block driver does not support parallel dispatch of requests. In
normal circumstances, all requests are anyway funneled through a single
work item, so parallel dispatch never happens. However it can happen if
there is no elevator.
Fix that by detecting if a dispatch is in progress and returning busy
(BLK_STS_RESOURCE) in that case
Fixes: 81196976ed ("mmc: block: Add blk-mq support")
Cc: stable@vger.kernel.org # v4.16+
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
124 lines
2.9 KiB
C
124 lines
2.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef MMC_QUEUE_H
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#define MMC_QUEUE_H
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#include <linux/types.h>
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#include <linux/blkdev.h>
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#include <linux/blk-mq.h>
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#include <linux/mmc/core.h>
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#include <linux/mmc/host.h>
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enum mmc_issued {
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MMC_REQ_STARTED,
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MMC_REQ_BUSY,
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MMC_REQ_FAILED_TO_START,
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MMC_REQ_FINISHED,
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};
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enum mmc_issue_type {
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MMC_ISSUE_SYNC,
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MMC_ISSUE_DCMD,
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MMC_ISSUE_ASYNC,
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MMC_ISSUE_MAX,
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};
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static inline struct mmc_queue_req *req_to_mmc_queue_req(struct request *rq)
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{
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return blk_mq_rq_to_pdu(rq);
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}
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struct mmc_queue_req;
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static inline struct request *mmc_queue_req_to_req(struct mmc_queue_req *mqr)
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{
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return blk_mq_rq_from_pdu(mqr);
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}
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struct mmc_blk_data;
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struct mmc_blk_ioc_data;
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struct mmc_blk_request {
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struct mmc_request mrq;
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struct mmc_command sbc;
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struct mmc_command cmd;
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struct mmc_command stop;
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struct mmc_data data;
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};
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/**
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* enum mmc_drv_op - enumerates the operations in the mmc_queue_req
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* @MMC_DRV_OP_IOCTL: ioctl operation
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* @MMC_DRV_OP_IOCTL_RPMB: RPMB-oriented ioctl operation
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* @MMC_DRV_OP_BOOT_WP: write protect boot partitions
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* @MMC_DRV_OP_GET_CARD_STATUS: get card status
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* @MMC_DRV_OP_GET_EXT_CSD: get the EXT CSD from an eMMC card
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*/
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enum mmc_drv_op {
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MMC_DRV_OP_IOCTL,
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MMC_DRV_OP_IOCTL_RPMB,
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MMC_DRV_OP_BOOT_WP,
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MMC_DRV_OP_GET_CARD_STATUS,
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MMC_DRV_OP_GET_EXT_CSD,
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};
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struct mmc_queue_req {
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struct mmc_blk_request brq;
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struct scatterlist *sg;
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enum mmc_drv_op drv_op;
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int drv_op_result;
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void *drv_op_data;
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unsigned int ioc_count;
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int retries;
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};
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struct mmc_queue {
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struct mmc_card *card;
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struct mmc_ctx ctx;
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struct blk_mq_tag_set tag_set;
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struct mmc_blk_data *blkdata;
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struct request_queue *queue;
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int in_flight[MMC_ISSUE_MAX];
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unsigned int cqe_busy;
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#define MMC_CQE_DCMD_BUSY BIT(0)
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#define MMC_CQE_QUEUE_FULL BIT(1)
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bool busy;
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bool use_cqe;
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bool recovery_needed;
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bool in_recovery;
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bool rw_wait;
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bool waiting;
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struct work_struct recovery_work;
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wait_queue_head_t wait;
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struct request *recovery_req;
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struct request *complete_req;
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struct mutex complete_lock;
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struct work_struct complete_work;
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};
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extern int mmc_init_queue(struct mmc_queue *, struct mmc_card *, spinlock_t *,
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const char *);
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extern void mmc_cleanup_queue(struct mmc_queue *);
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extern void mmc_queue_suspend(struct mmc_queue *);
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extern void mmc_queue_resume(struct mmc_queue *);
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extern unsigned int mmc_queue_map_sg(struct mmc_queue *,
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struct mmc_queue_req *);
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void mmc_cqe_check_busy(struct mmc_queue *mq);
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void mmc_cqe_recovery_notifier(struct mmc_request *mrq);
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enum mmc_issue_type mmc_issue_type(struct mmc_queue *mq, struct request *req);
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static inline int mmc_tot_in_flight(struct mmc_queue *mq)
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{
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return mq->in_flight[MMC_ISSUE_SYNC] +
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mq->in_flight[MMC_ISSUE_DCMD] +
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mq->in_flight[MMC_ISSUE_ASYNC];
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}
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static inline int mmc_cqe_qcnt(struct mmc_queue *mq)
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{
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return mq->in_flight[MMC_ISSUE_DCMD] +
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mq->in_flight[MMC_ISSUE_ASYNC];
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}
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#endif
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