Commit eecfffc1 authored by FUJITA Tomonori's avatar FUJITA Tomonori Committed by Ingo Molnar
Browse files

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: default avatarFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 6e03f998

include/linux/iommu-helper.h

+10 −0
Original line number Diff line number Diff line 
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);