drivers: iommu: Add flags to iommu_domain_alloc

Add the ability to pass flags into the iommu_domain_alloc
function to specify domain attributes.

Signed-off-by: Stepan Moskovchenko <[email protected]>

Author: Stepan Moskovchenko

drivers/iommu/iommu.c

@@ -136,7 +136,7 @@ void iommu_set_fault_handler(struct iommu_domain *domain,
 }
 EXPORT_SYMBOL_GPL(iommu_set_fault_handler);
 
-struct iommu_domain *iommu_domain_alloc(struct bus_type *bus)
+struct iommu_domain *iommu_domain_alloc(struct bus_type *bus, int flags)
 {
 	struct iommu_domain *domain;
 	int ret;
@@ -150,7 +150,7 @@ struct iommu_domain *iommu_domain_alloc(struct bus_type *bus)
 
 	domain->ops = bus->iommu_ops;
 
-	ret = domain->ops->domain_init(domain);
+	ret = domain->ops->domain_init(domain, flags);
 	if (ret)
 		goto out_free;
 

drivers/iommu/msm_iommu.c

@@ -210,7 +210,7 @@ static void __program_context(void __iomem *base, int ctx, phys_addr_t pgtable)
 	SET_M(base, ctx, 1);
 }
 
-static int msm_iommu_domain_init(struct iommu_domain *domain)
+static int msm_iommu_domain_init(struct iommu_domain *domain, int flags)
 {
 	struct msm_priv *priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 

include/linux/iommu.h

@@ -63,7 +63,7 @@ struct iommu_domain {
  * @pgsize_bitmap: bitmap of supported page sizes
  */
 struct iommu_ops {
-	int (*domain_init)(struct iommu_domain *domain);
+	int (*domain_init)(struct iommu_domain *domain, int flags);
 	void (*domain_destroy)(struct iommu_domain *domain);
 	int (*attach_dev)(struct iommu_domain *domain, struct device *dev);
 	void (*detach_dev)(struct iommu_domain *domain, struct device *dev);
@@ -85,7 +85,7 @@ struct iommu_ops {
 
 extern int bus_set_iommu(struct bus_type *bus, struct iommu_ops *ops);
 extern bool iommu_present(struct bus_type *bus);
-extern struct iommu_domain *iommu_domain_alloc(struct bus_type *bus);
+extern struct iommu_domain *iommu_domain_alloc(struct bus_type *bus, int flags);
 extern void iommu_domain_free(struct iommu_domain *domain);
 extern int iommu_attach_device(struct iommu_domain *domain,
 			       struct device *dev);
@@ -155,7 +155,7 @@ static inline bool iommu_present(struct bus_type *bus)
 	return false;
 }
 
-static inline struct iommu_domain *iommu_domain_alloc(struct bus_type *bus)
+static inline struct iommu_domain *iommu_domain_alloc(struct bus_type *bus, int flags)
 {
 	return NULL;
 }

virt/kvm/iommu.c

@@ -242,7 +242,7 @@ int kvm_iommu_map_guest(struct kvm *kvm)
 
 	mutex_lock(&kvm->slots_lock);
 
-	kvm->arch.iommu_domain = iommu_domain_alloc(&pci_bus_type);
+	kvm->arch.iommu_domain = iommu_domain_alloc(&pci_bus_type, 0);
 	if (!kvm->arch.iommu_domain) {
 		r = -ENOMEM;
 		goto out_unlock;