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| author | Pierre Ossman <drzeus@drzeus.cx> | 2007-05-12 00:26:16 +0200 |
|---|---|---|
| committer | Pierre Ossman <drzeus@drzeus.cx> | 2007-07-09 21:22:53 +0200 |
| commit | 98ccf14909ba02a41c5925b0b2c92aeeef23d3b9 (patch) | |
| tree | 331b645ee008f858305f7406f4639119b275ff82 /drivers/mmc/card/queue.h | |
| parent | 7dcca30a32aadb0520417521b0c44f42d09fe05c (diff) | |
| download | linux-98ccf14909ba02a41c5925b0b2c92aeeef23d3b9.tar.gz linux-98ccf14909ba02a41c5925b0b2c92aeeef23d3b9.tar.bz2 linux-98ccf14909ba02a41c5925b0b2c92aeeef23d3b9.zip | |
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.h | 7 |
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 |