iommu/dart: Convert to domain_alloc_paging()

Since the IDENTITY and BLOCKED behaviors were moved to global statics all
that remains is the paging domain. Rename to
apple_dart_attach_dev_paging() and remove the left over type check.

Reviewed-by: Janne Grunau <j@jannau.net>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Acked-by: Sven Peter <sven@svenpeter.dev>
Link: https://lore.kernel.org/r/7-v2-bff223cf6409+282-dart_paging_jgg@nvidia.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>

Author: jgunthorpe

drivers/iommu/apple-dart.c

@@ -651,8 +651,8 @@ static int apple_dart_domain_add_streams(struct apple_dart_domain *domain,
 				      true);
 }
 
-static int apple_dart_attach_dev(struct iommu_domain *domain,
-				 struct device *dev)
+static int apple_dart_attach_dev_paging(struct iommu_domain *domain,
+					struct device *dev)
 {
 	int ret, i;
 	struct apple_dart_stream_map *stream_map;
@@ -748,13 +748,10 @@ static void apple_dart_release_device(struct device *dev)
 	kfree(cfg);
 }
 
-static struct iommu_domain *apple_dart_domain_alloc(unsigned int type)
+static struct iommu_domain *apple_dart_domain_alloc_paging(struct device *dev)
 {
 	struct apple_dart_domain *dart_domain;
 
-	if (type != IOMMU_DOMAIN_DMA && type != IOMMU_DOMAIN_UNMANAGED)
-		return NULL;
-
 	dart_domain = kzalloc(sizeof(*dart_domain), GFP_KERNEL);
 	if (!dart_domain)
 		return NULL;
@@ -975,7 +972,7 @@ static void apple_dart_get_resv_regions(struct device *dev,
 static const struct iommu_ops apple_dart_iommu_ops = {
 	.identity_domain = &apple_dart_identity_domain,
 	.blocked_domain = &apple_dart_blocked_domain,
-	.domain_alloc = apple_dart_domain_alloc,
+	.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,
@@ -985,7 +982,7 @@ static const struct iommu_ops apple_dart_iommu_ops = {
 	.pgsize_bitmap = -1UL, /* Restricted during dart probe */
 	.owner = THIS_MODULE,
 	.default_domain_ops = &(const struct iommu_domain_ops) {
-		.attach_dev	= apple_dart_attach_dev,
+		.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,