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iommu: add iommu_device_max_index IOMMU helper function

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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>
This commit is contained in:
FUJITA Tomonori 2008-09-12 19:42:33 +09:00 committed by Ingo Molnar
parent 6e03f99803
commit eecfffc154
1 changed files with 10 additions and 0 deletions
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10
include/linux/iommu-helper.h
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@ -1,3 +1,13 @@
static inline unsigned long iommu_device_max_index(unsigned long size,
unsigned long offset,
u64 dma_mask)
{
if (size + offset > dma_mask)
return dma_mask - offset + 1;
else
return size;
}
extern int iommu_is_span_boundary(unsigned int index, unsigned int nr,
unsigned long shift,
unsigned long boundary_size);