diff options
| author |   Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> | 2019-08-28 21:35:42 +0900 |
|---|---|---|
| committer |   Christoph Hellwig <hch@lst.de> | 2019-09-03 08:32:50 +0200 |
| commit | 45147fb522bb459e79bdcb7504ee7ec8cfd4c12c (patch) | |
| tree | 5b02f6cc1daaaf79add184033aa31d399e8909ca /include/linux/blkdev.h | |
| parent | MIPS: document mixing "slightly different CCAs" (diff) | |
| download | linux-dev-45147fb522bb459e79bdcb7504ee7ec8cfd4c12c.tar.xz linux-dev-45147fb522bb459e79bdcb7504ee7ec8cfd4c12c.zip | |
block: add a helper function to merge the segments
This patch adds a helper function whether a queue can merge
the segments by the DMA MAP layer (e.g. via IOMMU).
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Simon Horman <horms+renesas@verge.net.au
Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to '')
| -rw-r--r-- | include/linux/blkdev.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 1ef375dafb1c..f6d55e2490dc 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -1085,6 +1085,8 @@ extern void blk_queue_dma_alignment(struct request_queue *, int); extern void blk_queue_update_dma_alignment(struct request_queue *, int); extern void blk_queue_rq_timeout(struct request_queue *, unsigned int); extern void blk_queue_write_cache(struct request_queue *q, bool enabled, bool fua); +extern bool blk_queue_can_use_dma_map_merging(struct request_queue *q, + struct device *dev); /* * Number of physical segments as sent to the device. |