iommu/amd: Put IOMMUv2 devices in a direct mapped domain

A device that might be used for HSA needs to be in a direct
mapped domain so that all DMA-API mappings stay alive when
the IOMMUv2 stack is used.

Signed-off-by: Joerg Roedel <jroedel@suse.de>

drivers/iommu/amd_iommu.c

@@ -2253,6 +2253,8 @@ static void detach_device(struct device *dev)
 
 static int amd_iommu_add_device(struct device *dev)
 {
+	struct iommu_dev_data *dev_data;
+	struct iommu_domain *domain;
 	struct amd_iommu *iommu;
 	u16 devid;
 	int ret;
@@ -2270,7 +2272,18 @@ static int amd_iommu_add_device(struct device *dev)
 	}
 	init_iommu_group(dev);
 
-	dev->archdata.dma_ops = &amd_iommu_dma_ops;
+	dev_data = get_dev_data(dev);
+	if (dev_data && dev_data->iommu_v2)
+		iommu_request_dm_for_dev(dev);
+
+	/* Domains are initialized for this device - have a look what we ended up with */
+	domain = iommu_get_domain_for_dev(dev);
+	if (domain->type == IOMMU_DOMAIN_IDENTITY) {
+		dev_data->passthrough = true;
+		dev->archdata.dma_ops = &nommu_dma_ops;
+	} else {
+		dev->archdata.dma_ops = &amd_iommu_dma_ops;
+	}
 
 out:
 	iommu_completion_wait(iommu);