iommu/dart: Use separate iommu_ops for DARTs w/o bypass

These DARTs do not support identity mappings so use a struct iommu_ops
without default identity domain. Since commit 3bc0102 ("iommu:
apple-dart: Allow mismatched bypass support") groups with mismatched
bypass support are supported so the check for bypass support in
apple_dart_attach_dev_identity() has to stay.

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

Author: jannau

drivers/iommu/apple-dart.c

@@ -1001,6 +1001,11 @@ static int apple_dart_def_domain_type(struct device *dev)
 	return 0;
 }
 
+static int apple_dart_def_domain_type_dma(struct device *dev)
+{
+	return IOMMU_DOMAIN_DMA;
+}
+
 #ifndef CONFIG_PCIE_APPLE_MSI_DOORBELL_ADDR
 /* Keep things compiling when CONFIG_PCI_APPLE isn't selected */
 #define CONFIG_PCIE_APPLE_MSI_DOORBELL_ADDR	0
@@ -1026,28 +1031,37 @@ static void apple_dart_get_resv_regions(struct device *dev,
 	iommu_dma_get_resv_regions(dev, head);
 }
 
+#define APPLE_DART_IOMMU_COMMON_OPS() \
+	.domain_alloc_paging = apple_dart_domain_alloc_paging, \
+	.probe_device = apple_dart_probe_device, \
+	.release_device = apple_dart_release_device, \
+	.device_group = apple_dart_device_group, \
+	.of_xlate = apple_dart_of_xlate, \
+	.get_resv_regions = apple_dart_get_resv_regions, \
+	.pgsize_bitmap = -1UL, /* Restricted during dart probe */ \
+	.owner = THIS_MODULE, \
+	.default_domain_ops = &(const struct iommu_domain_ops) { \
+		.attach_dev	= apple_dart_attach_dev_paging, \
+		.map_pages	= apple_dart_map_pages, \
+		.unmap_pages	= apple_dart_unmap_pages, \
+		.flush_iotlb_all = apple_dart_flush_iotlb_all, \
+		.iotlb_sync	= apple_dart_iotlb_sync, \
+		.iotlb_sync_map	= apple_dart_iotlb_sync_map, \
+		.iova_to_phys	= apple_dart_iova_to_phys, \
+		.free		= apple_dart_domain_free, \
+	}
+
 static const struct iommu_ops apple_dart_iommu_ops = {
 	.identity_domain = &apple_dart_identity_domain,
 	.blocked_domain = &apple_dart_blocked_domain,
-	.domain_alloc_paging = apple_dart_domain_alloc_paging,
-	.probe_device = apple_dart_probe_device,
-	.release_device = apple_dart_release_device,
-	.device_group = apple_dart_device_group,
-	.of_xlate = apple_dart_of_xlate,
 	.def_domain_type = apple_dart_def_domain_type,
-	.get_resv_regions = apple_dart_get_resv_regions,
-	.pgsize_bitmap = -1UL, /* Restricted during dart probe */
-	.owner = THIS_MODULE,
-	.default_domain_ops = &(const struct iommu_domain_ops) {
-		.attach_dev	= apple_dart_attach_dev_paging,
-		.map_pages	= apple_dart_map_pages,
-		.unmap_pages	= apple_dart_unmap_pages,
-		.flush_iotlb_all = apple_dart_flush_iotlb_all,
-		.iotlb_sync	= apple_dart_iotlb_sync,
-		.iotlb_sync_map	= apple_dart_iotlb_sync_map,
-		.iova_to_phys	= apple_dart_iova_to_phys,
-		.free		= apple_dart_domain_free,
-	}
+	APPLE_DART_IOMMU_COMMON_OPS()
+};
+
+static const struct iommu_ops apple_dart_iommu_no_bypass_ops = {
+	.blocked_domain = &apple_dart_blocked_domain,
+	.def_domain_type = apple_dart_def_domain_type_dma,
+	APPLE_DART_IOMMU_COMMON_OPS()
 };
 
 static irqreturn_t apple_dart_t8020_irq(int irq, void *dev)
@@ -1254,7 +1268,10 @@ static int apple_dart_probe(struct platform_device *pdev)
 	if (ret)
 		goto err_free_irq;
 
-	ret = iommu_device_register(&dart->iommu, &apple_dart_iommu_ops, dev);
+	if (!dart->supports_bypass)
+		ret = iommu_device_register(&dart->iommu, &apple_dart_iommu_no_bypass_ops, dev);
+	else
+		ret = iommu_device_register(&dart->iommu, &apple_dart_iommu_ops, dev);
 	if (ret)
 		goto err_sysfs_remove;