iommu: Remove ops.pgsize_bitmap from drivers that don't use it

These drivers all set the domain->pgsize_bitmap in their
domain_alloc_paging() functions, so the ops value is never used. Delete
it.

Reviewed-by: Sven Peter <sven@svenpeter.dev> # for Apple DART
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Tomasz Jeznach <tjeznach@rivosinc.com> # for RISC-V
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Tested-by: Nicolin Chen <nicolinc@nvidia.com>
Link: https://lore.kernel.org/r/3-v2-68a2e1ba507c+1fb-iommu_rm_ops_pgsize_jgg@nvidia.com
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>

Author: jgunthorpe

drivers/iommu/apple-dart.c

@@ -991,7 +991,6 @@ static const struct iommu_ops apple_dart_iommu_ops = {
 	.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,

drivers/iommu/intel/iommu.c

@@ -4365,7 +4365,6 @@ const struct iommu_ops intel_iommu_ops = {
 	.device_group		= intel_iommu_device_group,
 	.is_attach_deferred	= intel_iommu_is_attach_deferred,
 	.def_domain_type	= device_def_domain_type,
-	.pgsize_bitmap		= SZ_4K,
 	.page_response		= intel_iommu_page_response,
 	.default_domain_ops = &(const struct iommu_domain_ops) {
 		.attach_dev		= intel_iommu_attach_device,

drivers/iommu/iommufd/selftest.c

@@ -801,7 +801,6 @@ static const struct iommu_ops mock_ops = {
 	.default_domain = &mock_blocking_domain,
 	.blocked_domain = &mock_blocking_domain,
 	.owner = THIS_MODULE,
-	.pgsize_bitmap = MOCK_IO_PAGE_SIZE,
 	.hw_info = mock_domain_hw_info,
 	.domain_alloc_paging_flags = mock_domain_alloc_paging_flags,
 	.domain_alloc_nested = mock_domain_alloc_nested,

drivers/iommu/riscv/iommu.c

@@ -1533,7 +1533,6 @@ static void riscv_iommu_release_device(struct device *dev)
 }
 
 static const struct iommu_ops riscv_iommu_ops = {
-	.pgsize_bitmap = SZ_4K,
 	.of_xlate = riscv_iommu_of_xlate,
 	.identity_domain = &riscv_iommu_identity_domain,
 	.blocked_domain = &riscv_iommu_blocking_domain,

drivers/iommu/virtio-iommu.c

@@ -998,7 +998,7 @@ static void viommu_get_resv_regions(struct device *dev, struct list_head *head)
 	iommu_dma_get_resv_regions(dev, head);
 }
 
-static struct iommu_ops viommu_ops;
+static const struct iommu_ops viommu_ops;
 static struct virtio_driver virtio_iommu_drv;
 
 static int viommu_match_node(struct device *dev, const void *data)
@@ -1086,7 +1086,7 @@ static bool viommu_capable(struct device *dev, enum iommu_cap cap)
 	}
 }
 
-static struct iommu_ops viommu_ops = {
+static const struct iommu_ops viommu_ops = {
 	.capable		= viommu_capable,
 	.domain_alloc_identity	= viommu_domain_alloc_identity,
 	.domain_alloc_paging	= viommu_domain_alloc_paging,
@@ -1217,8 +1217,6 @@ static int viommu_probe(struct virtio_device *vdev)
 		viommu->first_domain++;
 	}
 
-	viommu_ops.pgsize_bitmap = viommu->pgsize_bitmap;
-
 	virtio_device_ready(vdev);
 
 	/* Populate the event queue with buffers */