linux-kernel - [PATCH v3 2/6] iommu/vt-d: Remove mm->pasid in intel_sva_bind

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Message-Id: <20230905000930.24515-3-tina.zhang@intel.com>
Date:   Tue,  5 Sep 2023 08:09:26 +0800
From:   Tina Zhang <tina.zhang@...el.com>
To:     Jason Gunthorpe <jgg@...pe.ca>, Kevin Tian <kevin.tian@...el.com>,
        Lu Baolu <baolu.lu@...ux.intel.com>
Cc:     Michael Shavit <mshavit@...gle.com>,
        Vasant Hegde <vasant.hegde@....com>, iommu@...ts.linux.dev,
        linux-kernel@...r.kernel.org, Tina Zhang <tina.zhang@...el.com>
Subject: [PATCH v3 2/6] iommu/vt-d: Remove mm->pasid in intel_sva_bind_mm()

The pasid is passed in as a parameter through .set_dev_pasid() callback.
Thus, intel_sva_bind_mm() can directly use it instead of retrieving the
pasid value from mm->pasid.

Suggested-by: Lu Baolu <baolu.lu@...ux.intel.com>
Signed-off-by: Tina Zhang <tina.zhang@...el.com>
---
 drivers/iommu/intel/svm.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/iommu/intel/svm.c b/drivers/iommu/intel/svm.c
index e95b339e9cdc..3527f8833d84 100644
--- a/drivers/iommu/intel/svm.c
+++ b/drivers/iommu/intel/svm.c
@@ -298,21 +298,22 @@ static int pasid_to_svm_sdev(struct device *dev, unsigned int pasid,
 }
 
 static int intel_svm_bind_mm(struct intel_iommu *iommu, struct device *dev,
-			     struct mm_struct *mm)
+			     struct iommu_domain *domain, ioasid_t pasid)
 {
 	struct device_domain_info *info = dev_iommu_priv_get(dev);
+	struct mm_struct *mm = domain->mm;
 	struct intel_svm_dev *sdev;
 	struct intel_svm *svm;
 	unsigned long sflags;
 	int ret = 0;
 
-	svm = pasid_private_find(mm->pasid);
+	svm = pasid_private_find(pasid);
 	if (!svm) {
 		svm = kzalloc(sizeof(*svm), GFP_KERNEL);
 		if (!svm)
 			return -ENOMEM;
 
-		svm->pasid = mm->pasid;
+		svm->pasid = pasid;
 		svm->mm = mm;
 		INIT_LIST_HEAD_RCU(&svm->devs);
 
@@ -350,7 +351,7 @@ static int intel_svm_bind_mm(struct intel_iommu *iommu, struct device *dev,
 
 	/* 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, mm->pasid,
+	ret = intel_pasid_setup_first_level(iommu, dev, mm->pgd, pasid,
 					    FLPT_DEFAULT_DID, sflags);
 	if (ret)
 		goto free_sdev;
@@ -364,7 +365,7 @@ static int intel_svm_bind_mm(struct intel_iommu *iommu, struct device *dev,
 free_svm:
 	if (list_empty(&svm->devs)) {
 		mmu_notifier_unregister(&svm->notifier, mm);
-		pasid_private_remove(mm->pasid);
+		pasid_private_remove(pasid);
 		kfree(svm);
 	}
 
@@ -839,11 +840,10 @@ static int intel_svm_set_dev_pasid(struct iommu_domain *domain,
 {
 	struct device_domain_info *info = dev_iommu_priv_get(dev);
 	struct intel_iommu *iommu = info->iommu;
-	struct mm_struct *mm = domain->mm;
 	int ret;
 
 	mutex_lock(&pasid_mutex);
-	ret = intel_svm_bind_mm(iommu, dev, mm);
+	ret = intel_svm_bind_mm(iommu, dev, domain, pasid);
 	mutex_unlock(&pasid_mutex);
 
 	return ret;
-- 
2.17.1