Commit 645c4c8d authored by Joerg Roedel's avatar Joerg Roedel

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
......@@ -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
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