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Commit c6229ca6 authored by Joerg Roedel's avatar Joerg Roedel
Browse files

AMD IOMMU: add domain map function for IOMMU API 



Impact: add a generic function to map pages into protection domains

Signed-off-by: default avatarJoerg Roedel <joerg.roedel@amd.com>
parent 01106066

arch/x86/kernel/amd_iommu.c

+29 −0
Original line number Diff line number Diff line
@@ -1718,4 +1718,33 @@ static int amd_iommu_attach_device(struct iommu_domain *dom, 
	return 0;

}



static int amd_iommu_map_range(struct iommu_domain *dom,

			       unsigned long iova, phys_addr_t paddr,

			       size_t size, int iommu_prot)

{

	struct protection_domain *domain = dom->priv;

	unsigned long i,  npages = iommu_num_pages(paddr, size, PAGE_SIZE);

	int prot = 0;

	int ret;



	if (iommu_prot & IOMMU_READ)

		prot |= IOMMU_PROT_IR;

	if (iommu_prot & IOMMU_WRITE)

		prot |= IOMMU_PROT_IW;



	iova  &= PAGE_MASK;

	paddr &= PAGE_MASK;



	for (i = 0; i < npages; ++i) {

		ret = iommu_map_page(domain, iova, paddr, prot);

		if (ret)

			return ret;



		iova  += PAGE_SIZE;

		paddr += PAGE_SIZE;

	}



	return 0;

}



#endif