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authorYoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>2019-08-28 21:35:42 +0900
committerChristoph Hellwig <hch@lst.de>2019-09-03 08:32:50 +0200
commit45147fb522bb459e79bdcb7504ee7ec8cfd4c12c (patch)
tree5b02f6cc1daaaf79add184033aa31d399e8909ca /block
parentdb91427b6502e8e46db4b616e4eaa9b9cf4e6363 (diff)
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 'block')
-rw-r--r--block/blk-settings.c23
1 files changed, 23 insertions, 0 deletions
diff --git a/block/blk-settings.c b/block/blk-settings.c
index 2c1831207a8f..c3632fc6d540 100644
--- a/block/blk-settings.c
+++ b/block/blk-settings.c
@@ -12,6 +12,7 @@
#include <linux/lcm.h>
#include <linux/jiffies.h>
#include <linux/gfp.h>
+#include <linux/dma-mapping.h>
#include "blk.h"
#include "blk-wbt.h"
@@ -832,6 +833,28 @@ void blk_queue_write_cache(struct request_queue *q, bool wc, bool fua)
}
EXPORT_SYMBOL_GPL(blk_queue_write_cache);
+/**
+ * blk_queue_can_use_dma_map_merging - configure queue for merging segments.
+ * @q: the request queue for the device
+ * @dev: the device pointer for dma
+ *
+ * Tell the block layer about merging the segments by dma map of @q.
+ */
+bool blk_queue_can_use_dma_map_merging(struct request_queue *q,
+ struct device *dev)
+{
+ unsigned long boundary = dma_get_merge_boundary(dev);
+
+ if (!boundary)
+ return false;
+
+ /* No need to update max_segment_size. see blk_queue_virt_boundary() */
+ blk_queue_virt_boundary(q, boundary);
+
+ return true;
+}
+EXPORT_SYMBOL_GPL(blk_queue_can_use_dma_map_merging);
+
static int __init blk_settings_init(void)
{
blk_max_low_pfn = max_low_pfn - 1;

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