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Commit 636dc67c authored by FUJITA Tomonori's avatar FUJITA Tomonori Committed by Ingo Molnar
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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: default avatarFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Acked-by: default avatarJoerg Roedel <joerg.roedel@amd.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent e92b4fda

include/linux/dma-mapping.h

+5 −0
Original line number Diff line number Diff line
@@ -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