linux-kernel - [PATCH v1 1/3] iommu/arm-smmu-v3-sva: Remove unused iommu

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Date:   Tue,  5 Sep 2023 19:49:12 +0800
From:   Michael Shavit <mshavit@...gle.com>
To:     iommu@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Cc:     will@...nel.org, robin.murphy@....com, nicolinc@...dia.com,
        jean-philippe@...aro.org, jgg@...dia.com, tina.zhang@...el.com,
        Michael Shavit <mshavit@...gle.com>,
        Jason Gunthorpe <jgg@...pe.ca>, Joerg Roedel <joro@...tes.org>,
        Kevin Tian <kevin.tian@...el.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        Mark Brown <broonie@...nel.org>,
        Tomas Krcka <krckatom@...zon.de>,
        Yicong Yang <yangyicong@...ilicon.com>
Subject: [PATCH v1 1/3] iommu/arm-smmu-v3-sva: Remove unused iommu_sva handle

The __arm_smmu_sva_bind function returned an unused iommu_sva handle
that can be removed.

Signed-off-by: Michael Shavit <mshavit@...gle.com>
---

 .../iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c    | 18 ++++++------------
 1 file changed, 6 insertions(+), 12 deletions(-)

diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c
index a5a63b1c947eb..32784758ccce6 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c
@@ -25,7 +25,6 @@ struct arm_smmu_mmu_notifier {
 #define mn_to_smmu(mn) container_of(mn, struct arm_smmu_mmu_notifier, mn)
 
 struct arm_smmu_bond {
-	struct iommu_sva		sva;
 	struct mm_struct		*mm;
 	struct arm_smmu_mmu_notifier	*smmu_mn;
 	struct list_head		list;
@@ -320,8 +319,7 @@ static void arm_smmu_mmu_notifier_put(struct arm_smmu_mmu_notifier *smmu_mn)
 	arm_smmu_free_shared_cd(cd);
 }
 
-static struct iommu_sva *
-__arm_smmu_sva_bind(struct device *dev, struct mm_struct *mm)
+static int __arm_smmu_sva_bind(struct device *dev, struct mm_struct *mm)
 {
 	int ret;
 	struct arm_smmu_bond *bond;
@@ -330,7 +328,7 @@ __arm_smmu_sva_bind(struct device *dev, struct mm_struct *mm)
 	struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
 
 	if (!master || !master->sva_enabled)
-		return ERR_PTR(-ENODEV);
+		return -ENODEV;
 
 	/* If bind() was already called for this {dev, mm} pair, reuse it. */
 	list_for_each_entry(bond, &master->bonds, list) {
@@ -342,10 +340,9 @@ __arm_smmu_sva_bind(struct device *dev, struct mm_struct *mm)
 
 	bond = kzalloc(sizeof(*bond), GFP_KERNEL);
 	if (!bond)
-		return ERR_PTR(-ENOMEM);
+		return -ENOMEM;
 
 	bond->mm = mm;
-	bond->sva.dev = dev;
 	refcount_set(&bond->refs, 1);
 
 	bond->smmu_mn = arm_smmu_mmu_notifier_get(smmu_domain, mm);
@@ -355,11 +352,11 @@ __arm_smmu_sva_bind(struct device *dev, struct mm_struct *mm)
 	}
 
 	list_add(&bond->list, &master->bonds);
-	return &bond->sva;
+	return 0;
 
 err_free_bond:
 	kfree(bond);
-	return ERR_PTR(ret);
+	return ret;
 }
 
 bool arm_smmu_sva_supported(struct arm_smmu_device *smmu)
@@ -537,13 +534,10 @@ static int arm_smmu_sva_set_dev_pasid(struct iommu_domain *domain,
 				      struct device *dev, ioasid_t id)
 {
 	int ret = 0;
-	struct iommu_sva *handle;
 	struct mm_struct *mm = domain->mm;
 
 	mutex_lock(&sva_lock);
-	handle = __arm_smmu_sva_bind(dev, mm);
-	if (IS_ERR(handle))
-		ret = PTR_ERR(handle);
+	ret = __arm_smmu_sva_bind(dev, mm);
 	mutex_unlock(&sva_lock);
 
 	return ret;
-- 
2.42.0.283.g2d96d420d3-goog