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>
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@ -48,6 +48,11 @@ static inline int is_device_dma_capable(struct device *dev)
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return dev->dma_mask != NULL && *dev->dma_mask != DMA_MASK_NONE;
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}
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static inline int is_buffer_dma_capable(u64 mask, dma_addr_t addr, size_t size)
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{
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return addr + size <= mask;
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}
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#ifdef CONFIG_HAS_DMA
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#include <asm/dma-mapping.h>
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#else
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