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Commit 645c4c8d authored by Joerg Roedel's avatar Joerg Roedel
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AMD IOMMU: add domain address lookup function for IOMMU API 



Impact: add a generic function to lockup addresses in protection domains

Signed-off-by: default avatarJoerg Roedel <joerg.roedel@amd.com>
parent eb74ff6c

arch/x86/kernel/amd_iommu.c

+31 −0
Original line number Diff line number Diff line
@@ -1788,4 +1788,35 @@ static void amd_iommu_unmap_range(struct iommu_domain *dom, 
	iommu_flush_domain(domain->id);

}



static phys_addr_t amd_iommu_iova_to_phys(struct iommu_domain *dom,

					  unsigned long iova)

{

	struct protection_domain *domain = dom->priv;

	unsigned long offset = iova & ~PAGE_MASK;

	phys_addr_t paddr;

	u64 *pte;



	pte = &domain->pt_root[IOMMU_PTE_L2_INDEX(iova)];



	if (!IOMMU_PTE_PRESENT(*pte))

		return 0;



	pte = IOMMU_PTE_PAGE(*pte);

	pte = &pte[IOMMU_PTE_L1_INDEX(iova)];



	if (!IOMMU_PTE_PRESENT(*pte))

		return 0;



	pte = IOMMU_PTE_PAGE(*pte);

	pte = &pte[IOMMU_PTE_L0_INDEX(iova)];



	if (!IOMMU_PTE_PRESENT(*pte))

		return 0;



	paddr  = *pte & IOMMU_PAGE_MASK;

	paddr |= offset;



	return paddr;

}



#endif