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x86/amd-iommu: Make amd_iommu_iova_to_phys aware of multiple page sizes 

This patch extends the amd_iommu_iova_to_phys() function to
handle different page sizes correctly. It doesn't use
fetch_pte() anymore because we don't know (or care about)
the page_size used for mapping the given iova.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Joerg Roedel 2010-01-21 16:15:24 +01:00
parent 24cd772315
commit f03152bb7d
1 changed files with 9 additions and 4 deletions
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13
arch/x86/kernel/amd_iommu.c
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@ -2556,17 +2556,22 @@ 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;
unsigned long offset_mask;
phys_addr_t paddr;
u64 *pte;
u64 *pte, __pte;
pte = fetch_pte(domain, iova);
if (!pte || !IOMMU_PTE_PRESENT(*pte))
return 0;
paddr = *pte & IOMMU_PAGE_MASK;
paddr |= offset;
if (PM_PTE_LEVEL(*pte) == 0)
offset_mask = PAGE_SIZE - 1;
else
offset_mask = PTE_PAGE_SIZE(*pte) - 1;
__pte = *pte & PM_ADDR_MASK;
paddr = (__pte & ~offset_mask) | (iova & offset_mask);
return paddr;
}