[PATCH v2 3/3] iommu/vt-d: Make the blocked domain support PASID

[Yi Liu <yi.l.liu@intel.com>]

The blocked domain can be extended to park PASID of a device to be the
DMA blocking state. By this the remove_dev_pasid() op is dropped.

Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Yi Liu <yi.l.liu@intel.com>
---
 drivers/iommu/intel/iommu.c | 19 +++++++++++++------
 drivers/iommu/intel/pasid.c |  3 ++-
 2 files changed, 15 insertions(+), 7 deletions(-)

diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index d089ac148a7e..f814fadcf34e 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -3412,10 +3412,15 @@ static int blocking_domain_attach_dev(struct iommu_domain *domain,
 	return 0;
 }
 
+static int blocking_domain_set_dev_pasid(struct iommu_domain *domain,
+					 struct device *dev, ioasid_t pasid,
+					 struct iommu_domain *old);
+
 static struct iommu_domain blocking_domain = {
 	.type = IOMMU_DOMAIN_BLOCKED,
 	.ops = &(const struct iommu_domain_ops) {
 		.attach_dev	= blocking_domain_attach_dev,
+		.set_dev_pasid	= blocking_domain_set_dev_pasid,
 	}
 };
 
@@ -4282,8 +4287,9 @@ static void domain_remove_dev_pasid(struct iommu_domain *domain,
 	kfree(dev_pasid);
 }
 
-static void intel_iommu_remove_dev_pasid(struct device *dev, ioasid_t pasid,
-					 struct iommu_domain *domain)
+static int blocking_domain_set_dev_pasid(struct iommu_domain *domain,
+					 struct device *dev, ioasid_t pasid,
+					 struct iommu_domain *old)
 {
 	struct device_domain_info *info = dev_iommu_priv_get(dev);
 	struct intel_iommu *iommu = info->iommu;
@@ -4292,10 +4298,12 @@ static void intel_iommu_remove_dev_pasid(struct device *dev, ioasid_t pasid,
 				    INTEL_PASID_TEARDOWN_DRAIN_PRQ);
 
 	/* Identity domain has no meta data for pasid. */
-	if (domain->type == IOMMU_DOMAIN_IDENTITY)
-		return;
+	if (old->type == IOMMU_DOMAIN_IDENTITY)
+		goto out;
 
-	domain_remove_dev_pasid(domain, dev, pasid);
+	domain_remove_dev_pasid(old, dev, pasid);
+out:
+	return 0;
 }
 
 static struct dev_pasid_info *
@@ -4653,7 +4661,6 @@ const struct iommu_ops intel_iommu_ops = {
 	.dev_disable_feat	= intel_iommu_dev_disable_feat,
 	.is_attach_deferred	= intel_iommu_is_attach_deferred,
 	.def_domain_type	= device_def_domain_type,
-	.remove_dev_pasid	= intel_iommu_remove_dev_pasid,
 	.pgsize_bitmap		= SZ_4K,
 #ifdef CONFIG_INTEL_IOMMU_SVM
 	.page_response		= intel_svm_page_response,
diff --git a/drivers/iommu/intel/pasid.c b/drivers/iommu/intel/pasid.c
index ce0a3bf701df..abf2f54e847e 100644
--- a/drivers/iommu/intel/pasid.c
+++ b/drivers/iommu/intel/pasid.c
@@ -238,7 +238,8 @@ devtlb_invalidation_with_pasid(struct intel_iommu *iommu,
 
 /*
  * Caller can request to drain PRQ in this helper if it hasn't done so,
- * e.g. in a path which doesn't follow remove_dev_pasid().
+ * e.g. in a path which doesn't follow the set_dev_pasid() op of the
+ * blocked domain.
  * Return the pasid entry pointer if the entry is found or NULL if no
  * entry found.
  */
-- 
2.34.1