Messages in this thread Patch in this message | | | From | Joerg Roedel <> | Subject | [PATCH 18/19] AMD IOMMU: add domain address lookup function for IOMMU API | Date | Thu, 4 Dec 2008 18:31:55 +0100 |
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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
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