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e0097cf5f2
The only time the driver sleeps expecting to be woken upon the arrival of a new request, is when the dispatch queue is empty. The only time that it is known whether the dispatch queue is empty is after NULL is returned from blk_fetch_request() while under the queue lock. Recognizing those facts, simplify the synchronization between the queue thread and the request function. A couple of flags tell the request function what to do, and the queue lock and barriers associated with wake-ups ensure synchronization. The result is simpler and allows the removal of the context_info lock. Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Reviewed-by: Harjani Ritesh <riteshh@codeaurora.org> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
63 lines
1.5 KiB
C
63 lines
1.5 KiB
C
#ifndef MMC_QUEUE_H
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#define MMC_QUEUE_H
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static inline bool mmc_req_is_special(struct request *req)
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{
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return req &&
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(req_op(req) == REQ_OP_FLUSH ||
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req_op(req) == REQ_OP_DISCARD ||
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req_op(req) == REQ_OP_SECURE_ERASE);
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}
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struct request;
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struct task_struct;
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struct mmc_blk_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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int retune_retry_done;
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};
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struct mmc_queue_req {
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struct request *req;
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struct mmc_blk_request brq;
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struct scatterlist *sg;
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char *bounce_buf;
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struct scatterlist *bounce_sg;
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unsigned int bounce_sg_len;
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struct mmc_async_req mmc_active;
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};
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struct mmc_queue {
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struct mmc_card *card;
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struct task_struct *thread;
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struct semaphore thread_sem;
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unsigned int flags;
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#define MMC_QUEUE_SUSPENDED (1 << 0)
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#define MMC_QUEUE_NEW_REQUEST (1 << 1)
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bool asleep;
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struct mmc_blk_data *blkdata;
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struct request_queue *queue;
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struct mmc_queue_req mqrq[2];
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struct mmc_queue_req *mqrq_cur;
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struct mmc_queue_req *mqrq_prev;
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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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extern void mmc_queue_bounce_pre(struct mmc_queue_req *);
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extern void mmc_queue_bounce_post(struct mmc_queue_req *);
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extern int mmc_access_rpmb(struct mmc_queue *);
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#endif
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