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| author |   FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> | 2008-09-10 01:06:46 +0900 |
|---|---|---|
| committer |   Ingo Molnar <mingo@elte.hu> | 2008-09-10 11:33:43 +0200 |
| commit | 636dc67cbf8c481a996faf6c23f0532d0f02ebad (patch) | |
| tree | 344e1d8c6e4b91cfb941d2dfba76ac6498393b19 /include/linux/dma-mapping.h | |
| parent | Merge commit 'v2.6.27-rc6' into x86/iommu (diff) | |
| download | linux-dev-636dc67cbf8c481a996faf6c23f0532d0f02ebad.tar.xz linux-dev-636dc67cbf8c481a996faf6c23f0532d0f02ebad.zip | |
add is_buffer_dma_capable helper function
is_buffer_dma_capable helper function is to see if a memory region is
DMA-capable or not. The arugments are the dma_mask (or
coherent_dma_mask) of a device and the address and size of a memory
region.
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Acked-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/linux/dma-mapping.h')
| -rw-r--r-- | include/linux/dma-mapping.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h index 952e0f857ac9..6ed50c1642f1 100644 --- a/include/linux/dma-mapping.h +++ b/include/linux/dma-mapping.h @@ -48,6 +48,11 @@ static inline int is_device_dma_capable(struct device *dev) return dev->dma_mask != NULL && *dev->dma_mask != DMA_MASK_NONE; } +static inline int is_buffer_dma_capable(u64 mask, dma_addr_t addr, size_t size) +{ + return addr + size <= mask; +} + #ifdef CONFIG_HAS_DMA #include <asm/dma-mapping.h> #else |