iommu: Parse translated reserved regions

These regions are setup by the boot loader and require an iommu to
translate arbitray physical to device VA mappings.

Signed-off-by: Janne Grunau <j@jannau.net>

Author: jannau

drivers/iommu/dma-iommu.c

@@ -500,8 +500,13 @@ static int iova_reserve_iommu_regions(struct device *dev,
 		if (region->type == IOMMU_RESV_SW_MSI)
 			continue;
 
-		lo = iova_pfn(iovad, region->start);
-		hi = iova_pfn(iovad, region->start + region->length - 1);
+		if (region->type == IOMMU_RESV_TRANSLATED) {
+			lo = iova_pfn(iovad, region->dva);
+			hi = iova_pfn(iovad, region->dva + region->length - 1);
+		} else {
+			lo = iova_pfn(iovad, region->start);
+			hi = iova_pfn(iovad, region->start + region->length - 1);
+		}
 		reserve_iova(iovad, lo, hi);
 
 		if (region->type == IOMMU_RESV_MSI)

drivers/iommu/of_iommu.c

@@ -168,9 +168,7 @@ iommu_resv_region_get_type(struct device *dev,
 	if (start == phys->start && end == phys->end)
 		return IOMMU_RESV_DIRECT;
 
-	dev_warn(dev, "treating non-direct mapping [%pr] -> [%pap-%pap] as reservation\n", &phys,
-		 &start, &end);
-	return IOMMU_RESV_RESERVED;
+	return IOMMU_RESV_TRANSLATED;
 }
 
 /**
@@ -234,8 +232,13 @@ void of_iommu_get_resv_regions(struct device *dev, struct list_head *list)
 				maps = of_translate_dma_region(np, maps, &iova, &length);
 				type = iommu_resv_region_get_type(dev, &phys, iova, length);
 
-				region = iommu_alloc_resv_region(iova, length, prot, type,
+				if (type == IOMMU_RESV_TRANSLATED)
+					region = iommu_alloc_resv_region_tr(phys.start, iova, length, prot, type,
+								    GFP_KERNEL);
+				else
+					region = iommu_alloc_resv_region(iova, length, prot, type,
 								 GFP_KERNEL);
+
 				if (region)
 					list_add_tail(&region->list, list);
 			}