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Subject[PATCH 19/21] AMD IOMMU: add domain unmap function for IOMMU API
Date
Impact: add a generic function to unmap pages into protection domains

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
---
arch/x86/kernel/amd_iommu.c | 39 +++++++++++++++++++++++++++++++++++++++
1 files changed, 39 insertions(+), 0 deletions(-)
diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index 511f782..6ee9377 100644
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -438,6 +438,28 @@ static int iommu_map_page(struct protection_domain *dom,
return 0;
}

+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;
+}
+
/*
* This function checks if a specific unity mapping entry is needed for
* this specific IOMMU.
@@ -1663,3 +1685,20 @@ 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);
+}
--
1.5.6.4



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