[PATCH v6 1/6] iommu/arm-smmu-v3: Factor out a common domain alloc

[Shameer Kolothum]

And use that for arm_smmu_domain_alloc_paging(). This will be useful
in a subsequent patch as well where we introduce support for
domain_alloc_user().

While at it, rename arm_smmu_domain_free() to arm_smmu_domain_free_paging()
as it is only used for paging domain.

Reviewed-by: Jason Gunthorpe <jgg at nvidia.com>
Reviewed-by: Nicolin Chen <nicolinc at nvidia.com>
Reviewed-by: Kevin Tian <kevin.tian at intel.com>
Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi at huawei.com>
---
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 31 ++++++++++++++-------
 1 file changed, 21 insertions(+), 10 deletions(-)

diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
index ab415e107054..c296435896f7 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -2237,6 +2237,22 @@ static bool arm_smmu_capable(struct device *dev, enum iommu_cap cap)
 	}
 }
 
+static struct arm_smmu_domain *arm_smmu_domain_alloc_common(void)
+{
+	struct arm_smmu_domain *smmu_domain;
+
+	smmu_domain = kzalloc(sizeof(*smmu_domain), GFP_KERNEL);
+	if (!smmu_domain)
+		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);
+
+	return smmu_domain;
+}
+
 static struct iommu_domain *arm_smmu_domain_alloc(unsigned type)
 {
 
@@ -2254,14 +2270,9 @@ static struct iommu_domain *arm_smmu_domain_alloc_paging(struct device *dev)
 	 * We can't really do anything meaningful until we've added a
 	 * master.
 	 */
-	smmu_domain = kzalloc(sizeof(*smmu_domain), GFP_KERNEL);
-	if (!smmu_domain)
-		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);
+	smmu_domain = arm_smmu_domain_alloc_common();
+	if (IS_ERR(smmu_domain))
+		return ERR_CAST(smmu_domain);
 
 	if (dev) {
 		struct arm_smmu_master *master = dev_iommu_priv_get(dev);
@@ -2276,7 +2287,7 @@ static struct iommu_domain *arm_smmu_domain_alloc_paging(struct device *dev)
 	return &smmu_domain->domain;
 }
 
-static void arm_smmu_domain_free(struct iommu_domain *domain)
+static void arm_smmu_domain_free_paging(struct iommu_domain *domain)
 {
 	struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
 	struct arm_smmu_device *smmu = smmu_domain->smmu;
@@ -3119,7 +3130,7 @@ static struct iommu_ops arm_smmu_ops = {
 		.iotlb_sync		= arm_smmu_iotlb_sync,
 		.iova_to_phys		= arm_smmu_iova_to_phys,
 		.enable_nesting		= arm_smmu_enable_nesting,
-		.free			= arm_smmu_domain_free,
+		.free			= arm_smmu_domain_free_paging,
 	}
 };
 
-- 
2.34.1