[PATCH v2 2/6] iommu/vt-d: Move intel_drain_pasid_prq() into intel_pasid_tear_down_entry()

[Yi Liu <yi.l.liu@xxxxxxxxx>]

Draining PRQ is mostly conjuncted with pasid teardown, and with more callers coming,
move it into it in the intel_pasid_tear_down_entry(). But there is scenario that only
teardown pasid entry but no PRQ drain, so passing a flag to mark it.

Signed-off-by: Yi Liu <yi.l.liu@xxxxxxxxx>
---
 drivers/iommu/intel/iommu.c |  8 ++++----
 drivers/iommu/intel/pasid.c | 13 +++++++++++--
 drivers/iommu/intel/pasid.h |  8 +++++---
 drivers/iommu/intel/svm.c   |  3 ++-
 4 files changed, 22 insertions(+), 10 deletions(-)

diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index 1a2a5cf4ef60..80b587de226d 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -3376,7 +3376,7 @@ void device_block_translation(struct device *dev)
 	if (!dev_is_real_dma_subdevice(dev)) {
 		if (sm_supported(iommu))
 			intel_pasid_tear_down_entry(iommu, dev,
-						    IOMMU_NO_PASID, false);
+						    IOMMU_NO_PASID, 0);
 		else
 			domain_context_clear(info);
 	}
@@ -4258,7 +4258,7 @@ static void intel_iommu_remove_dev_pasid(struct device *dev, ioasid_t pasid,
 	unsigned long flags;
 
 	if (domain->type == IOMMU_DOMAIN_IDENTITY) {
-		intel_pasid_tear_down_entry(iommu, dev, pasid, false);
+		intel_pasid_tear_down_entry(iommu, dev, pasid, 0);
 		return;
 	}
 
@@ -4278,8 +4278,8 @@ 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);
-	intel_drain_pasid_prq(dev, pasid);
+	intel_pasid_tear_down_entry(iommu, dev, pasid,
+				    INTEL_PASID_TEARDOWN_DRAIN_PRQ);
 }
 
 static int intel_iommu_set_dev_pasid(struct iommu_domain *domain,
diff --git a/drivers/iommu/intel/pasid.c b/drivers/iommu/intel/pasid.c
index b51fc268dc84..ceb9c5274a39 100644
--- a/drivers/iommu/intel/pasid.c
+++ b/drivers/iommu/intel/pasid.c
@@ -236,8 +236,13 @@ devtlb_invalidation_with_pasid(struct intel_iommu *iommu,
 		qi_flush_dev_iotlb_pasid(iommu, sid, pfsid, pasid, qdep, 0, 64 - VTD_PAGE_SHIFT);
 }
 
+/*
+ * Not all PASID entry destroy requires PRQ drain as it can be handled in
+ * the remove_dev_pasid path. Caller should be clear about it and set the
+ * @flags properly.
+ */
 void intel_pasid_tear_down_entry(struct intel_iommu *iommu, struct device *dev,
-				 u32 pasid, bool fault_ignore)
+				 u32 pasid, u32 flags)
 {
 	struct pasid_entry *pte;
 	u16 did, pgtt;
@@ -251,7 +256,8 @@ void intel_pasid_tear_down_entry(struct intel_iommu *iommu, struct device *dev,
 
 	did = pasid_get_domain_id(pte);
 	pgtt = pasid_pte_get_pgtt(pte);
-	intel_pasid_clear_entry(dev, pasid, fault_ignore);
+	intel_pasid_clear_entry(dev, pasid,
+				flags & INTEL_PASID_TEARDOWN_IGNORE_FAULT);
 	spin_unlock(&iommu->lock);
 
 	if (!ecap_coherent(iommu->ecap))
@@ -267,6 +273,9 @@ void intel_pasid_tear_down_entry(struct intel_iommu *iommu, struct device *dev,
 	/* Device IOTLB doesn't need to be flushed in caching mode. */
 	if (!cap_caching_mode(iommu->cap))
 		devtlb_invalidation_with_pasid(iommu, dev, pasid);
+
+	if (flags & INTEL_PASID_TEARDOWN_DRAIN_PRQ)
+		intel_drain_pasid_prq(dev, pasid);
 }
 
 /*
diff --git a/drivers/iommu/intel/pasid.h b/drivers/iommu/intel/pasid.h
index dde6d3ba5ae0..6eb849ec5fb8 100644
--- a/drivers/iommu/intel/pasid.h
+++ b/drivers/iommu/intel/pasid.h
@@ -303,9 +303,11 @@ int intel_pasid_setup_pass_through(struct intel_iommu *iommu,
 				   struct device *dev, u32 pasid);
 int intel_pasid_setup_nested(struct intel_iommu *iommu, struct device *dev,
 			     u32 pasid, struct dmar_domain *domain);
-void intel_pasid_tear_down_entry(struct intel_iommu *iommu,
-				 struct device *dev, u32 pasid,
-				 bool fault_ignore);
+
+#define INTEL_PASID_TEARDOWN_IGNORE_FAULT	(1U << 0)
+#define INTEL_PASID_TEARDOWN_DRAIN_PRQ		(1U << 1)
+void intel_pasid_tear_down_entry(struct intel_iommu *iommu, struct device *dev,
+				 u32 pasid, u32 flags);
 void intel_pasid_setup_page_snoop_control(struct intel_iommu *iommu,
 					  struct device *dev, u32 pasid);
 int intel_pasid_setup_sm_context(struct device *dev);
diff --git a/drivers/iommu/intel/svm.c b/drivers/iommu/intel/svm.c
index 5ae1df7598b7..3c1e105b9da6 100644
--- a/drivers/iommu/intel/svm.c
+++ b/drivers/iommu/intel/svm.c
@@ -176,7 +176,8 @@ static void intel_mm_release(struct mmu_notifier *mn, struct mm_struct *mm)
 	list_for_each_entry(dev_pasid, &domain->dev_pasids, link_domain) {
 		info = dev_iommu_priv_get(dev_pasid->dev);
 		intel_pasid_tear_down_entry(info->iommu, dev_pasid->dev,
-					    dev_pasid->pasid, true);
+					    dev_pasid->pasid,
+					    INTEL_PASID_TEARDOWN_IGNORE_FAULT);
 	}
 	spin_unlock_irqrestore(&domain->lock, flags);
 
-- 
2.34.1