iommu: add iommu_device_max_index IOMMU helper function
This function helps IOMMUs to know the highest address that a device can access to. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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@ -1,3 +1,13 @@
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static inline unsigned long iommu_device_max_index(unsigned long size,
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unsigned long offset,
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u64 dma_mask)
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{
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if (size + offset > dma_mask)
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return dma_mask - offset + 1;
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else
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return size;
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}
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extern int iommu_is_span_boundary(unsigned int index, unsigned int nr,
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unsigned long shift,
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unsigned long boundary_size);
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