iommu/arm-smmu-v3: Convert to domain_alloc_paging()

Now that the BLOCKED and IDENTITY behaviors are managed with their own
domains change to the domain_alloc_paging() op.

For now SVA remains using the old interface, eventually it will get its
own op that can pass in the device and mm_struct which will let us have a
sane lifetime for the mmu_notifier.

Call arm_smmu_domain_finalise() early if dev is available.

Tested-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
Tested-by: Nicolin Chen <nicolinc@nvidia.com>
Tested-by: Moritz Fischer <moritzf@google.com>
Reviewed-by: Nicolin Chen <nicolinc@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/16-v6-96275f25c39d+2d4-smmuv3_newapi_p1_jgg@nvidia.com
Signed-off-by: Will Deacon <will@kernel.org>

Author: jgunthorpe

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

@@ -2197,14 +2197,15 @@ static bool arm_smmu_capable(struct device *dev, enum iommu_cap cap)
 
 static struct iommu_domain *arm_smmu_domain_alloc(unsigned type)
 {
-	struct arm_smmu_domain *smmu_domain;
 
 	if (type == IOMMU_DOMAIN_SVA)
 		return arm_smmu_sva_domain_alloc();
+	return ERR_PTR(-EOPNOTSUPP);
+}
 
-	if (type != IOMMU_DOMAIN_UNMANAGED &&
-	    type != IOMMU_DOMAIN_DMA)
-		return NULL;
+static struct iommu_domain *arm_smmu_domain_alloc_paging(struct device *dev)
+{
+	struct arm_smmu_domain *smmu_domain;
 
 	/*
 	 * Allocate the domain and initialise some of its data structures.
@@ -2213,13 +2214,23 @@ static struct iommu_domain *arm_smmu_domain_alloc(unsigned type)
 	 */
 	smmu_domain = kzalloc(sizeof(*smmu_domain), GFP_KERNEL);
 	if (!smmu_domain)
-		return NULL;
+		return ERR_PTR(-ENOMEM);
 
 	mutex_init(&smmu_domain->init_mutex);
 	INIT_LIST_HEAD(&smmu_domain->devices);
 	spin_lock_init(&smmu_domain->devices_lock);
 	INIT_LIST_HEAD(&smmu_domain->mmu_notifiers);
 
+	if (dev) {
+		struct arm_smmu_master *master = dev_iommu_priv_get(dev);
+		int ret;
+
+		ret = arm_smmu_domain_finalise(smmu_domain, master->smmu);
+		if (ret) {
+			kfree(smmu_domain);
+			return ERR_PTR(ret);
+		}
+	}
 	return &smmu_domain->domain;
 }
 
@@ -3083,6 +3094,7 @@ static struct iommu_ops arm_smmu_ops = {
 	.blocked_domain		= &arm_smmu_blocked_domain,
 	.capable		= arm_smmu_capable,
 	.domain_alloc		= arm_smmu_domain_alloc,
+	.domain_alloc_paging    = arm_smmu_domain_alloc_paging,
 	.probe_device		= arm_smmu_probe_device,
 	.release_device		= arm_smmu_release_device,
 	.device_group		= arm_smmu_device_group,