iommu: Remove domain_init and domain_free iommu_ops

All drivers have been converted to the new domain_alloc and
domain_free iommu-ops. So remove the old ones and get rid of
iommu_domain->priv too, as this is no longer needed when the
struct iommu_domain is embedded in the private structures of
the iommu drivers.

Tested-by: Thierry Reding <treding@nvidia.com>
Tested-by: Heiko Stuebner <heiko@sntech.de>
Reviewed-by: Alex Williamson <alex.williamson@redhat.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>

drivers/iommu/iommu.c

@@ -900,51 +900,25 @@ EXPORT_SYMBOL_GPL(iommu_set_fault_handler);
 
 struct iommu_domain *iommu_domain_alloc(struct bus_type *bus)
 {
-	const struct iommu_ops *ops;
 	struct iommu_domain *domain;
 
 	if (bus == NULL || bus->iommu_ops == NULL)
 		return NULL;
 
-	ops = bus->iommu_ops;
-
-	if (ops->domain_alloc)
-		domain = ops->domain_alloc(IOMMU_DOMAIN_UNMANAGED);
-	else
-		domain = kzalloc(sizeof(*domain), GFP_KERNEL);
-
+	domain = bus->iommu_ops->domain_alloc(IOMMU_DOMAIN_UNMANAGED);
 	if (!domain)
 		return NULL;
 
 	domain->ops  = bus->iommu_ops;
 	domain->type = IOMMU_DOMAIN_UNMANAGED;
 
-	if (ops->domain_init && domain->ops->domain_init(domain))
-		goto out_free;
-
 	return domain;
-
-out_free:
-	if (ops->domain_free)
-		ops->domain_free(domain);
-	else
-		kfree(domain);
-
-	return NULL;
 }
 EXPORT_SYMBOL_GPL(iommu_domain_alloc);
 
 void iommu_domain_free(struct iommu_domain *domain)
 {
-	const struct iommu_ops *ops = domain->ops;
-
-	if (likely(ops->domain_destroy != NULL))
-		ops->domain_destroy(domain);
-
-	if (ops->domain_free)
-		ops->domain_free(domain);
-	else
-		kfree(domain);
+	domain->ops->domain_free(domain);
 }
 EXPORT_SYMBOL_GPL(iommu_domain_free);
 

include/linux/iommu.h

@@ -78,7 +78,6 @@ struct iommu_domain_geometry {
 struct iommu_domain {
 	unsigned type;
 	const struct iommu_ops *ops;
-	void *priv;
 	iommu_fault_handler_t handler;
 	void *handler_token;
 	struct iommu_domain_geometry geometry;
@@ -138,8 +137,6 @@ enum iommu_attr {
  */
 struct iommu_ops {
 	bool (*capable)(enum iommu_cap);
-	int (*domain_init)(struct iommu_domain *domain);
-	void (*domain_destroy)(struct iommu_domain *domain);
 
 	/* Domain allocation and freeing by the iommu driver */
 	struct iommu_domain *(*domain_alloc)(unsigned iommu_domain_type);