Commit eb74ff6c authored by Joerg Roedel's avatar Joerg Roedel

AMD IOMMU: add domain unmap function for IOMMU API

Impact: add a generic function to unmap pages into protection domains
Signed-off-by: default avatarJoerg Roedel <joerg.roedel@amd.com>
parent c6229ca6
......@@ -445,6 +445,30 @@ static int iommu_map_page(struct protection_domain *dom,
return 0;
}
#ifdef CONFIG_IOMMU_API
static void iommu_unmap_page(struct protection_domain *dom,
unsigned long bus_addr)
{
u64 *pte;
pte = &dom->pt_root[IOMMU_PTE_L2_INDEX(bus_addr)];
if (!IOMMU_PTE_PRESENT(*pte))
return;
pte = IOMMU_PTE_PAGE(*pte);
pte = &pte[IOMMU_PTE_L1_INDEX(bus_addr)];
if (!IOMMU_PTE_PRESENT(*pte))
return;
pte = IOMMU_PTE_PAGE(*pte);
pte = &pte[IOMMU_PTE_L1_INDEX(bus_addr)];
*pte = 0;
}
#endif
/*
* This function checks if a specific unity mapping entry is needed for
* this specific IOMMU.
......@@ -1747,4 +1771,21 @@ static int amd_iommu_map_range(struct iommu_domain *dom,
return 0;
}
static void amd_iommu_unmap_range(struct iommu_domain *dom,
unsigned long iova, size_t size)
{
struct protection_domain *domain = dom->priv;
unsigned long i, npages = iommu_num_pages(iova, size, PAGE_SIZE);
iova &= PAGE_MASK;
for (i = 0; i < npages; ++i) {
iommu_unmap_page(domain, iova);
iova += PAGE_SIZE;
}
iommu_flush_domain(domain->id);
}
#endif
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