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AMD IOMMU: add domain address lookup function for IOMMU API

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

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Joerg Roedel 2008-12-02 20:05:50 +01:00
parent eb74ff6cc0
commit 645c4c8d72
1 changed files with 31 additions and 0 deletions
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31
arch/x86/kernel/amd_iommu.c
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@ -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