linux-kernel - [PATCH 04/12] iommu/vt-d: Remove sva from intel_svm

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Date:   Tue, 31 Jan 2023 15:37:32 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     Joerg Roedel <joro@...tes.org>
Cc:     kan.liang@...ux.intel.com, iommu@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: [PATCH 04/12] iommu/vt-d: Remove sva from intel_svm_dev

After commit be51b1d6bbff ("iommu/sva: Refactoring
iommu_sva_bind/unbind_device()"), the iommu driver doesn't need to
return an iommu_sva pointer anymore. This removes the sva field
from intel_svm_dev and cleanups the code accordingly.

Reviewed-by: Kevin Tian <kevin.tian@...el.com>
Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
Link: https://lore.kernel.org/r/20230109014955.147068-5-baolu.lu@linux.intel.com
---
 drivers/iommu/intel/iommu.h |  1 -
 drivers/iommu/intel/svm.c   | 23 +++++++++--------------
 2 files changed, 9 insertions(+), 15 deletions(-)

diff --git a/drivers/iommu/intel/iommu.h b/drivers/iommu/intel/iommu.h
index 2a1619ff0d79..f0222ad38757 100644
--- a/drivers/iommu/intel/iommu.h
+++ b/drivers/iommu/intel/iommu.h
@@ -761,7 +761,6 @@ struct intel_svm_dev {
 	struct rcu_head rcu;
 	struct device *dev;
 	struct intel_iommu *iommu;
-	struct iommu_sva sva;
 	u16 did;
 	u16 sid, qdep;
 };
diff --git a/drivers/iommu/intel/svm.c b/drivers/iommu/intel/svm.c
index c7dc53e40c26..e7b9bedebcc0 100644
--- a/drivers/iommu/intel/svm.c
+++ b/drivers/iommu/intel/svm.c
@@ -298,9 +298,8 @@ static int pasid_to_svm_sdev(struct device *dev, unsigned int pasid,
 	return 0;
 }
 
-static struct iommu_sva *intel_svm_bind_mm(struct intel_iommu *iommu,
-					   struct device *dev,
-					   struct mm_struct *mm)
+static int intel_svm_bind_mm(struct intel_iommu *iommu, struct device *dev,
+			     struct mm_struct *mm)
 {
 	struct device_domain_info *info = dev_iommu_priv_get(dev);
 	struct intel_svm_dev *sdev;
@@ -312,7 +311,7 @@ static struct iommu_sva *intel_svm_bind_mm(struct intel_iommu *iommu,
 	if (!svm) {
 		svm = kzalloc(sizeof(*svm), GFP_KERNEL);
 		if (!svm)
-			return ERR_PTR(-ENOMEM);
+			return -ENOMEM;
 
 		svm->pasid = mm->pasid;
 		svm->mm = mm;
@@ -322,14 +321,14 @@ static struct iommu_sva *intel_svm_bind_mm(struct intel_iommu *iommu,
 		ret = mmu_notifier_register(&svm->notifier, mm);
 		if (ret) {
 			kfree(svm);
-			return ERR_PTR(ret);
+			return ret;
 		}
 
 		ret = pasid_private_add(svm->pasid, svm);
 		if (ret) {
 			mmu_notifier_unregister(&svm->notifier, mm);
 			kfree(svm);
-			return ERR_PTR(ret);
+			return ret;
 		}
 	}
 
@@ -343,7 +342,6 @@ static struct iommu_sva *intel_svm_bind_mm(struct intel_iommu *iommu,
 	sdev->iommu = iommu;
 	sdev->did = FLPT_DEFAULT_DID;
 	sdev->sid = PCI_DEVID(info->bus, info->devfn);
-	sdev->sva.dev = dev;
 	init_rcu_head(&sdev->rcu);
 	if (info->ats_enabled) {
 		sdev->qdep = info->ats_qdep;
@@ -360,7 +358,7 @@ static struct iommu_sva *intel_svm_bind_mm(struct intel_iommu *iommu,
 
 	list_add_rcu(&sdev->list, &svm->devs);
 
-	return &sdev->sva;
+	return 0;
 
 free_sdev:
 	kfree(sdev);
@@ -371,7 +369,7 @@ static struct iommu_sva *intel_svm_bind_mm(struct intel_iommu *iommu,
 		kfree(svm);
 	}
 
-	return ERR_PTR(ret);
+	return ret;
 }
 
 /* Caller must hold pasid_mutex */
@@ -843,13 +841,10 @@ 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;
-	struct iommu_sva *sva;
-	int ret = 0;
+	int ret;
 
 	mutex_lock(&pasid_mutex);
-	sva = intel_svm_bind_mm(iommu, dev, mm);
-	if (IS_ERR(sva))
-		ret = PTR_ERR(sva);
+	ret = intel_svm_bind_mm(iommu, dev, mm);
 	mutex_unlock(&pasid_mutex);
 
 	return ret;
-- 
2.34.1