AMD IOMMU: add domain map function for IOMMU API

Impact: add a generic function to map 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 2f7c0b3..1fcedbe 100644 (file)
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -1718,4 +1718,33 @@ static int amd_iommu_attach_device(struct iommu_domain *dom,
        return 0;
 }
 
+static int amd_iommu_map_range(struct iommu_domain *dom,
+                              unsigned long iova, phys_addr_t paddr,
+                              size_t size, int iommu_prot)
+{
+       struct protection_domain *domain = dom->priv;
+       unsigned long i,  npages = iommu_num_pages(paddr, size, PAGE_SIZE);
+       int prot = 0;
+       int ret;
+
+       if (iommu_prot & IOMMU_READ)
+               prot |= IOMMU_PROT_IR;
+       if (iommu_prot & IOMMU_WRITE)
+               prot |= IOMMU_PROT_IW;
+
+       iova  &= PAGE_MASK;
+       paddr &= PAGE_MASK;
+
+       for (i = 0; i < npages; ++i) {
+               ret = iommu_map_page(domain, iova, paddr, prot);
+               if (ret)
+                       return ret;
+
+               iova  += PAGE_SIZE;
+               paddr += PAGE_SIZE;
+       }
+
+       return 0;
+}
+
 #endif