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authorFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>2008-09-12 19:42:34 +0900
committerIngo Molnar <mingo@elte.hu>2008-09-14 16:42:37 +0200
commit589fc9a6e2102b498978f6350581ec7fa5aeb032 (patch)
tree52bc87c5868170e8f6ff0205654149b47d19e2d5 /include/linux/dma-mapping.h
parenteecfffc154ffbfe70686a9905c090b488778c28e (diff)
iommu: add dma_get_mask helper function
Several IOMMUs do the same thing to get the dma_mask of a device. This adds a helper function to do the same thing to sweep them. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/linux/dma-mapping.h')
-rw-r--r--include/linux/dma-mapping.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
index 6ed50c1642f..0dba7433af1 100644
--- a/include/linux/dma-mapping.h
+++ b/include/linux/dma-mapping.h
@@ -63,6 +63,13 @@ static inline int is_buffer_dma_capable(u64 mask, dma_addr_t addr, size_t size)
#define dma_sync_single dma_sync_single_for_cpu
#define dma_sync_sg dma_sync_sg_for_cpu
+static inline u64 dma_get_mask(struct device *dev)
+{
+ if (dev->dma_mask && *dev->dma_mask)
+ return *dev->dma_mask;
+ return DMA_32BIT_MASK;
+}
+
extern u64 dma_get_required_mask(struct device *dev);
static inline unsigned int dma_get_max_seg_size(struct device *dev)