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| author | FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> | 2008-09-12 19:42:34 +0900 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-09-14 16:42:37 +0200 |
| commit | 589fc9a6e2102b498978f6350581ec7fa5aeb032 (patch) | |
| tree | 52bc87c5868170e8f6ff0205654149b47d19e2d5 /include/linux/dma-mapping.h | |
| parent | eecfffc154ffbfe70686a9905c090b488778c28e (diff) | |
| download | linux-3.10-589fc9a6e2102b498978f6350581ec7fa5aeb032.tar.gz linux-3.10-589fc9a6e2102b498978f6350581ec7fa5aeb032.tar.bz2 linux-3.10-589fc9a6e2102b498978f6350581ec7fa5aeb032.zip | |
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.h | 7 |
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) |