AMD IOMMU: add domain unmap function for IOMMU API
Impact: add a generic function to unmap pages into protection domains
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index 1fcedbe..d8a0abf 100644
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -445,6 +445,30 @@
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 @@
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