iommu/arm-smmu-v3: Enhance domain_alloc_user() to allocate PASID capable domain

Core layer is modified to call domain_alloc_user() to allocate PASID
capable domain. Enhance arm_smmu_domain_alloc_user() to allocate
PASID capable domain based on the 'flags' parameter.

Signed-off-by: Vasant Hegde <[email protected]>
Reviewed-by: Jason Gunthorpe <[email protected]>
Reviewed-by: Kevin Tian <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Joerg Roedel <[email protected]>

Author: hegdevasant

drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c

@@ -3084,7 +3084,8 @@ arm_smmu_domain_alloc_user(struct device *dev, u32 flags,
 			   const struct iommu_user_data *user_data)
 {
 	struct arm_smmu_master *master = dev_iommu_priv_get(dev);
-	const u32 PAGING_FLAGS = IOMMU_HWPT_ALLOC_DIRTY_TRACKING;
+	const u32 PAGING_FLAGS = IOMMU_HWPT_ALLOC_DIRTY_TRACKING |
+					IOMMU_HWPT_ALLOC_PASID;
 	struct arm_smmu_domain *smmu_domain;
 	int ret;
 
@@ -3093,6 +3094,9 @@ arm_smmu_domain_alloc_user(struct device *dev, u32 flags,
 	if (parent || user_data)
 		return ERR_PTR(-EOPNOTSUPP);
 
+	if (flags & IOMMU_HWPT_ALLOC_PASID)
+		return arm_smmu_domain_alloc_paging(dev);
+
 	smmu_domain = arm_smmu_domain_alloc();
 	if (IS_ERR(smmu_domain))
 		return ERR_CAST(smmu_domain);