From 98ccf14909ba02a41c5925b0b2c92aeeef23d3b9 Mon Sep 17 00:00:00 2001 From: Pierre Ossman Date: Sat, 12 May 2007 00:26:16 +0200 Subject: mmc: bounce requests for simple hosts 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 --- drivers/mmc/card/queue.h | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'drivers/mmc/card/queue.h') diff --git a/drivers/mmc/card/queue.h b/drivers/mmc/card/queue.h index 1590b3f3f1f7..64e66e0d4994 100644 --- a/drivers/mmc/card/queue.h +++ b/drivers/mmc/card/queue.h @@ -14,6 +14,9 @@ struct mmc_queue { void *data; struct request_queue *queue; struct scatterlist *sg; + char *bounce_buf; + struct scatterlist *bounce_sg; + unsigned int bounce_sg_len; }; extern int mmc_init_queue(struct mmc_queue *, struct mmc_card *, spinlock_t *); @@ -21,4 +24,8 @@ extern void mmc_cleanup_queue(struct mmc_queue *); extern void mmc_queue_suspend(struct mmc_queue *); extern void mmc_queue_resume(struct mmc_queue *); +extern unsigned int mmc_queue_map_sg(struct mmc_queue *); +extern void mmc_queue_bounce_pre(struct mmc_queue *); +extern void mmc_queue_bounce_post(struct mmc_queue *); + #endif -- cgit v1.2.3