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authorPierre Ossman <drzeus@drzeus.cx>2007-05-12 00:26:16 +0200
committerPierre Ossman <drzeus@drzeus.cx>2007-07-09 21:22:53 +0200
commit98ccf14909ba02a41c5925b0b2c92aeeef23d3b9 (patch)
tree331b645ee008f858305f7406f4639119b275ff82 /drivers/mmc/card/queue.h
parent7dcca30a32aadb0520417521b0c44f42d09fe05c (diff)
downloadlinux-linaro-stable-98ccf14909ba02a41c5925b0b2c92aeeef23d3b9.tar.gz
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 <drzeus@drzeus.cx>
Diffstat (limited to 'drivers/mmc/card/queue.h')
-rw-r--r--drivers/mmc/card/queue.h7
1 files changed, 7 insertions, 0 deletions
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