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98ccf14909
Some hosts cannot do scatter/gather in hardware. Since not doing sg is such a big performance hit, we (optionally) bounce the requests to a simple linear buffer that we hand over to the driver. Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
32 lines
849 B
C
32 lines
849 B
C
#ifndef MMC_QUEUE_H
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#define MMC_QUEUE_H
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struct request;
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struct task_struct;
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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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struct request *req;
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int (*issue_fn)(struct mmc_queue *, struct request *);
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void *data;
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struct request_queue *queue;
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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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};
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extern int mmc_init_queue(struct mmc_queue *, struct mmc_card *, spinlock_t *);
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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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extern void mmc_queue_bounce_pre(struct mmc_queue *);
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extern void mmc_queue_bounce_post(struct mmc_queue *);
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#endif
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