iommu/arm-smmu-v3: Make set_dev_pasid() op support replace

set_dev_pasid() op is going to be enhanced to support domain replacement
of a pasid. This prepares for this op definition.

Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Nicolin Chen <nicolinc@nvidia.com>
Signed-off-by: Yi Liu <yi.l.liu@intel.com>
Link: https://lore.kernel.org/r/20241107122234.7424-13-yi.l.liu@intel.com
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>

Author: jgunthorpe

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

@@ -349,7 +349,7 @@ static int arm_smmu_sva_set_dev_pasid(struct iommu_domain *domain,
 	 * get reassigned
 	 */
 	arm_smmu_make_sva_cd(&target, master, domain->mm, smmu_domain->cd.asid);
-	ret = arm_smmu_set_pasid(master, smmu_domain, id, &target);
+	ret = arm_smmu_set_pasid(master, smmu_domain, id, &target, old);
 
 	mmput(domain->mm);
 	return ret;

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

@@ -2883,7 +2883,7 @@ static int arm_smmu_s1_set_dev_pasid(struct iommu_domain *domain,
 	 */
 	arm_smmu_make_s1_cd(&target_cd, master, smmu_domain);
 	return arm_smmu_set_pasid(master, to_smmu_domain(domain), id,
-				  &target_cd);
+				  &target_cd, old);
 }
 
 static void arm_smmu_update_ste(struct arm_smmu_master *master,
@@ -2913,16 +2913,13 @@ static void arm_smmu_update_ste(struct arm_smmu_master *master,
 
 int arm_smmu_set_pasid(struct arm_smmu_master *master,
 		       struct arm_smmu_domain *smmu_domain, ioasid_t pasid,
-		       struct arm_smmu_cd *cd)
+		       struct arm_smmu_cd *cd, struct iommu_domain *old)
 {
 	struct iommu_domain *sid_domain = iommu_get_domain_for_dev(master->dev);
 	struct arm_smmu_attach_state state = {
 		.master = master,
-		/*
-		 * For now the core code prevents calling this when a domain is
-		 * already attached, no need to set old_domain.
-		 */
 		.ssid = pasid,
+		.old_domain = old,
 	};
 	struct arm_smmu_cd *cdptr;
 	int ret;

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

@@ -875,7 +875,7 @@ void arm_smmu_write_cd_entry(struct arm_smmu_master *master, int ssid,
 
 int arm_smmu_set_pasid(struct arm_smmu_master *master,
 		       struct arm_smmu_domain *smmu_domain, ioasid_t pasid,
-		       struct arm_smmu_cd *cd);
+		       struct arm_smmu_cd *cd, struct iommu_domain *old);
 
 void arm_smmu_tlb_inv_asid(struct arm_smmu_device *smmu, u16 asid);
 void arm_smmu_tlb_inv_range_asid(unsigned long iova, size_t size, int asid,