[PATCH 18/19] AMD IOMMU: add domain address lookup function for IOMMU API

Joerg Roedel
2008-12-04T17:43:29Z

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

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
---
arch/x86/kernel/amd_iommu.c | 31 +++++++++++++++++++++++++++++++
1 files changed, 31 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index 6898d10..57e636e 100644
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -1682,3 +1682,34 @@ 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;
+}
--
1.5.6.4