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authorJoerg Roedel <joerg.roedel@amd.com>2008-12-02 22:05:50 +0300
committerJoerg Roedel <joerg.roedel@amd.com>2009-01-03 16:11:56 +0300
commit645c4c8d7289a718c9c828ec217f2b94e3b3e6ff (patch)
tree9f6e26175240dce2a9264f0acbce9ea26c216511 /arch
parenteb74ff6cc0080c7f6270fdfffba65c4eff23d3ad (diff)
downloadlinux-645c4c8d7289a718c9c828ec217f2b94e3b3e6ff.tar.xz
AMD IOMMU: add domain address lookup function for IOMMU API
Impact: add a generic function to lockup addresses in protection domains Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/kernel/amd_iommu.c31
1 files changed, 31 insertions, 0 deletions
diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index d8a0abf423ba..b599e80051fc 100644
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -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