iommu/amd: Consolidate protection domain free code

Consolidate protection domain free code inside amd_iommu_domain_free()
and remove protection_domain_free() function.

Signed-off-by: Vasant Hegde <vasant.hegde@amd.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/20250227162320.5805-8-vasant.hegde@amd.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>

Author: hegdevasant

drivers/iommu/amd/amd_iommu.h

@@ -47,7 +47,6 @@ extern unsigned long amd_iommu_pgsize_bitmap;
 /* Protection domain ops */
 void amd_iommu_init_identity_domain(void);
 struct protection_domain *protection_domain_alloc(void);
-void protection_domain_free(struct protection_domain *domain);
 struct iommu_domain *amd_iommu_domain_alloc_sva(struct device *dev,
 						struct mm_struct *mm);
 void amd_iommu_domain_free(struct iommu_domain *dom);

drivers/iommu/amd/iommu.c

@@ -2434,15 +2434,6 @@ static struct iommu_group *amd_iommu_device_group(struct device *dev)
  *
  *****************************************************************************/
 
-void protection_domain_free(struct protection_domain *domain)
-{
-	WARN_ON(!list_empty(&domain->dev_list));
-	if (domain->domain.type & __IOMMU_DOMAIN_PAGING)
-		free_io_pgtable_ops(&domain->iop.pgtbl.ops);
-	pdom_id_free(domain->id);
-	kfree(domain);
-}
-
 static void protection_domain_init(struct protection_domain *domain)
 {
 	spin_lock_init(&domain->lock);
@@ -2580,7 +2571,11 @@ void amd_iommu_domain_free(struct iommu_domain *dom)
 {
 	struct protection_domain *domain = to_pdomain(dom);
 
-	protection_domain_free(domain);
+	WARN_ON(!list_empty(&domain->dev_list));
+	if (domain->domain.type & __IOMMU_DOMAIN_PAGING)
+		free_io_pgtable_ops(&domain->iop.pgtbl.ops);
+	pdom_id_free(domain->id);
+	kfree(domain);
 }
 
 static int blocked_domain_attach_device(struct iommu_domain *domain,

drivers/iommu/amd/pasid.c

@@ -195,7 +195,7 @@ struct iommu_domain *amd_iommu_domain_alloc_sva(struct device *dev,
 
 	ret = mmu_notifier_register(&pdom->mn, mm);
 	if (ret) {
-		protection_domain_free(pdom);
+		amd_iommu_domain_free(&pdom->domain);
 		return ERR_PTR(ret);
 	}