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Commit 589fc9a6 authored by FUJITA Tomonori's avatar FUJITA Tomonori Committed by Ingo Molnar
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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: default avatarFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent eecfffc1

include/linux/dma-mapping.h

+7 −0
Original line number Diff line number Diff line
@@ -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)