iommu/vt-d: Consolidate the struct dev_pasid_info add/remove

The domain_add_dev_pasid() and domain_remove_dev_pasid() are added to
consolidate the adding/removing of the struct dev_pasid_info. Besides,
it includes the cache tag assign/unassign as well.

This also prepares for adding domain replacement for pasid. The
set_dev_pasid callbacks need to deal with the dev_pasid_info for both old
and new domain. These two helpers make the life easier.

intel_iommu_set_dev_pasid() and intel_svm_set_dev_pasid() are updated to
use the helpers.

Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Yi Liu <yi.l.liu@intel.com>
Link: https://lore.kernel.org/r/20241107122234.7424-6-yi.l.liu@intel.com
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>

3 files changed, 74 insertions, 51 deletions

diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index 2d1d208d5125..103b109e23a9 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -4036,8 +4036,8 @@ static int intel_iommu_iotlb_sync_map(struct iommu_domain *domain,
 	return 0;
 }
 
-static void intel_iommu_remove_dev_pasid(struct device *dev, ioasid_t pasid,
-					 struct iommu_domain *domain)
+void domain_remove_dev_pasid(struct iommu_domain *domain,
+			     struct device *dev, ioasid_t pasid)
 {
 	struct device_domain_info *info = dev_iommu_priv_get(dev);
 	struct dev_pasid_info *curr, *dev_pasid = NULL;
@@ -4045,10 +4045,12 @@ static void intel_iommu_remove_dev_pasid(struct device *dev, ioasid_t pasid,
 	struct dmar_domain *dmar_domain;
 	unsigned long flags;
 
-	if (domain->type == IOMMU_DOMAIN_IDENTITY) {
-		intel_pasid_tear_down_entry(iommu, dev, pasid, false);
+	if (!domain)
+		return;
+
+	/* Identity domain has no meta data for pasid. */
+	if (domain->type == IOMMU_DOMAIN_IDENTITY)
 		return;
-	}
 
 	dmar_domain = to_dmar_domain(domain);
 	spin_lock_irqsave(&dmar_domain->lock, flags);
@@ -4066,7 +4068,52 @@ static void intel_iommu_remove_dev_pasid(struct device *dev, ioasid_t pasid,
 	domain_detach_iommu(dmar_domain, iommu);
 	intel_iommu_debugfs_remove_dev_pasid(dev_pasid);
 	kfree(dev_pasid);
-	intel_pasid_tear_down_entry(iommu, dev, pasid, false);
+}
+
+static void intel_iommu_remove_dev_pasid(struct device *dev, ioasid_t pasid,
+					 struct iommu_domain *domain)
+{
+	struct device_domain_info *info = dev_iommu_priv_get(dev);
+
+	intel_pasid_tear_down_entry(info->iommu, dev, pasid, false);
+	domain_remove_dev_pasid(domain, dev, pasid);
+}
+
+struct dev_pasid_info *
+domain_add_dev_pasid(struct iommu_domain *domain,
+		     struct device *dev, ioasid_t pasid)
+{
+	struct device_domain_info *info = dev_iommu_priv_get(dev);
+	struct dmar_domain *dmar_domain = to_dmar_domain(domain);
+	struct intel_iommu *iommu = info->iommu;
+	struct dev_pasid_info *dev_pasid;
+	unsigned long flags;
+	int ret;
+
+	dev_pasid = kzalloc(sizeof(*dev_pasid), GFP_KERNEL);
+	if (!dev_pasid)
+		return ERR_PTR(-ENOMEM);
+
+	ret = domain_attach_iommu(dmar_domain, iommu);
+	if (ret)
+		goto out_free;
+
+	ret = cache_tag_assign_domain(dmar_domain, dev, pasid);
+	if (ret)
+		goto out_detach_iommu;
+
+	dev_pasid->dev = dev;
+	dev_pasid->pasid = pasid;
+	spin_lock_irqsave(&dmar_domain->lock, flags);
+	list_add(&dev_pasid->link_domain, &dmar_domain->dev_pasids);
+	spin_unlock_irqrestore(&dmar_domain->lock, flags);
+
+	return dev_pasid;
+out_detach_iommu:
+	domain_detach_iommu(dmar_domain, iommu);
+out_free:
+	kfree(dev_pasid);
+	return ERR_PTR(ret);
 }
 
 static int intel_iommu_set_dev_pasid(struct iommu_domain *domain,
@@ -4077,7 +4124,6 @@ static int intel_iommu_set_dev_pasid(struct iommu_domain *domain,
 	struct dmar_domain *dmar_domain = to_dmar_domain(domain);
 	struct intel_iommu *iommu = info->iommu;
 	struct dev_pasid_info *dev_pasid;
-	unsigned long flags;
 	int ret;
 
 	if (!pasid_supported(iommu) || dev_is_real_dma_subdevice(dev))
@@ -4093,17 +4139,9 @@ static int intel_iommu_set_dev_pasid(struct iommu_domain *domain,
 	if (ret)
 		return ret;
 
-	dev_pasid = kzalloc(sizeof(*dev_pasid), GFP_KERNEL);
-	if (!dev_pasid)
-		return -ENOMEM;
-
-	ret = domain_attach_iommu(dmar_domain, iommu);
-	if (ret)
-		goto out_free;
-
-	ret = cache_tag_assign_domain(dmar_domain, dev, pasid);
-	if (ret)
-		goto out_detach_iommu;
+	dev_pasid = domain_add_dev_pasid(domain, dev, pasid);
+	if (IS_ERR(dev_pasid))
+		return PTR_ERR(dev_pasid);
 
 	if (dmar_domain->use_first_level)
 		ret = domain_setup_first_level(iommu, dmar_domain,
@@ -4112,24 +4150,17 @@ static int intel_iommu_set_dev_pasid(struct iommu_domain *domain,
 		ret = intel_pasid_setup_second_level(iommu, dmar_domain,
 						     dev, pasid);
 	if (ret)
-		goto out_unassign_tag;
+		goto out_remove_dev_pasid;
 
-	dev_pasid->dev = dev;
-	dev_pasid->pasid = pasid;
-	spin_lock_irqsave(&dmar_domain->lock, flags);
-	list_add(&dev_pasid->link_domain, &dmar_domain->dev_pasids);
-	spin_unlock_irqrestore(&dmar_domain->lock, flags);
+	domain_remove_dev_pasid(old, dev, pasid);
 
 	if (domain->type & __IOMMU_DOMAIN_PAGING)
 		intel_iommu_debugfs_create_dev_pasid(dev_pasid);
 
 	return 0;
-out_unassign_tag:
-	cache_tag_unassign_domain(dmar_domain, dev, pasid);
-out_detach_iommu:
-	domain_detach_iommu(dmar_domain, iommu);
-out_free:
-	kfree(dev_pasid);
+
+out_remove_dev_pasid:
+	domain_remove_dev_pasid(domain, dev, pasid);
 	return ret;
 }
 
diff --git a/drivers/iommu/intel/iommu.h b/drivers/iommu/intel/iommu.h
index b3912633ce25..df0261e03fad 100644
--- a/drivers/iommu/intel/iommu.h
+++ b/drivers/iommu/intel/iommu.h
@@ -1228,6 +1228,12 @@ void domain_detach_iommu(struct dmar_domain *domain, struct intel_iommu *iommu);
 void device_block_translation(struct device *dev);
 int paging_domain_compatible(struct iommu_domain *domain, struct device *dev);
 
+struct dev_pasid_info *
+domain_add_dev_pasid(struct iommu_domain *domain,
+		     struct device *dev, ioasid_t pasid);
+void domain_remove_dev_pasid(struct iommu_domain *domain,
+			     struct device *dev, ioasid_t pasid);
+
 int dmar_ir_support(void);
 
 void iommu_flush_write_buffer(struct intel_iommu *iommu);
diff --git a/drivers/iommu/intel/svm.c b/drivers/iommu/intel/svm.c
index 4a2bd65614ad..6c0685ea8466 100644
--- a/drivers/iommu/intel/svm.c
+++ b/drivers/iommu/intel/svm.c
@@ -115,43 +115,29 @@ static int intel_svm_set_dev_pasid(struct iommu_domain *domain,
 				   struct iommu_domain *old)
 {
 	struct device_domain_info *info = dev_iommu_priv_get(dev);
-	struct dmar_domain *dmar_domain = to_dmar_domain(domain);
 	struct intel_iommu *iommu = info->iommu;
 	struct mm_struct *mm = domain->mm;
 	struct dev_pasid_info *dev_pasid;
 	unsigned long sflags;
-	unsigned long flags;
 	int ret = 0;
 
-	dev_pasid = kzalloc(sizeof(*dev_pasid), GFP_KERNEL);
-	if (!dev_pasid)
-		return -ENOMEM;
-
-	dev_pasid->dev = dev;
-	dev_pasid->pasid = pasid;
-
-	ret = cache_tag_assign_domain(to_dmar_domain(domain), dev, pasid);
-	if (ret)
-		goto free_dev_pasid;
+	dev_pasid = domain_add_dev_pasid(domain, dev, pasid);
+	if (IS_ERR(dev_pasid))
+		return PTR_ERR(dev_pasid);
 
 	/* Setup the pasid table: */
 	sflags = cpu_feature_enabled(X86_FEATURE_LA57) ? PASID_FLAG_FL5LP : 0;
 	ret = intel_pasid_setup_first_level(iommu, dev, mm->pgd, pasid,
 					    FLPT_DEFAULT_DID, sflags);
 	if (ret)
-		goto unassign_tag;
+		goto out_remove_dev_pasid;
 
-	spin_lock_irqsave(&dmar_domain->lock, flags);
-	list_add(&dev_pasid->link_domain, &dmar_domain->dev_pasids);
-	spin_unlock_irqrestore(&dmar_domain->lock, flags);
+	domain_remove_dev_pasid(old, dev, pasid);
 
 	return 0;
 
-unassign_tag:
-	cache_tag_unassign_domain(to_dmar_domain(domain), dev, pasid);
-free_dev_pasid:
-	kfree(dev_pasid);
-
+out_remove_dev_pasid:
+	domain_remove_dev_pasid(domain, dev, pasid);
 	return ret;
 }