iommu/arm-smmu-v3: Add an inline arm_smmu_domain_free()

There will be a bit more things to free than smmu_domain itself. So keep a
simple inline function in the header to share aross files.

Suggested-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Acked-by: Balbir Singh <balbirs@nvidia.com>
Reviewed-by: Pranjal Shrivastava <praan@google.com>
Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
Signed-off-by: Will Deacon <will@kernel.org>

Author: nicolinc

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

@@ -197,7 +197,8 @@ static void arm_smmu_mm_release(struct mmu_notifier *mn, struct mm_struct *mm)
 
 static void arm_smmu_mmu_notifier_free(struct mmu_notifier *mn)
 {
-	kfree(container_of(mn, struct arm_smmu_domain, mmu_notifier));
+	arm_smmu_domain_free(
+		container_of(mn, struct arm_smmu_domain, mmu_notifier));
 }
 
 static const struct mmu_notifier_ops arm_smmu_mmu_notifier_ops = {
@@ -365,6 +366,6 @@ struct iommu_domain *arm_smmu_sva_domain_alloc(struct device *dev,
 err_asid:
 	xa_erase(&arm_smmu_asid_xa, smmu_domain->cd.asid);
 err_free:
-	kfree(smmu_domain);
+	arm_smmu_domain_free(smmu_domain);
 	return ERR_PTR(ret);
 }

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

@@ -2559,7 +2559,7 @@ static void arm_smmu_domain_free_paging(struct iommu_domain *domain)
 			ida_free(&smmu->vmid_map, cfg->vmid);
 	}
 
-	kfree(smmu_domain);
+	arm_smmu_domain_free(smmu_domain);
 }
 
 static int arm_smmu_domain_finalise_s1(struct arm_smmu_device *smmu,
@@ -3427,7 +3427,7 @@ arm_smmu_domain_alloc_paging_flags(struct device *dev, u32 flags,
 	return &smmu_domain->domain;
 
 err_free:
-	kfree(smmu_domain);
+	arm_smmu_domain_free(smmu_domain);
 	return ERR_PTR(ret);
 }
 

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

@@ -956,6 +956,11 @@ extern struct mutex arm_smmu_asid_lock;
 
 struct arm_smmu_domain *arm_smmu_domain_alloc(void);
 
+static inline void arm_smmu_domain_free(struct arm_smmu_domain *smmu_domain)
+{
+	kfree(smmu_domain);
+}
+
 void arm_smmu_clear_cd(struct arm_smmu_master *master, ioasid_t ssid);
 struct arm_smmu_cd *arm_smmu_get_cd_ptr(struct arm_smmu_master *master,
 					u32 ssid);