linux-kernel - [RFC PATCH 03/12] iommu/vt-d: Retire intel_svm_bind

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Date:   Tue, 17 Oct 2023 11:20:35 +0800
From:   Tina Zhang <tina.zhang@...el.com>
To:     iommu@...ts.linux.dev, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Cc:     David Woodhouse <dwmw2@...radead.org>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        Joerg Roedel <joro@...tes.org>, Jason Gunthorpe <jgg@...pe.ca>,
        Kevin Tian <kevin.tian@...el.com>,
        Tina Zhang <tina.zhang@...el.com>
Subject: [RFC PATCH 03/12] iommu/vt-d: Retire intel_svm_bind_mm()

Refactor intel_svm_set_dev_pasid() by moving the logic from
intel_svm_bind_mm() into intel_svm_set_dev_pasid() and retire
intel_svm_bind_mm().

No functional change intended.

The motivation is to let intel_iommu_set_dev_pasid() serve for both sva
domain and default domain set_dev_pasid operation, instead of duplicating
code for them. In latter patches, we will first do some refactoring to
intel_svm_set_dev_pasid(), and then extend intel_iommu_set_dev_pasid()
to support sva domain. After that, intel_svm_set_dev_pasid() will call
intel_iommu_set_dev_pasid() for set_dev_pasid purpose.

Signed-off-by: Tina Zhang <tina.zhang@...el.com>
---
 drivers/iommu/intel/svm.c | 14 +++-----------
 1 file changed, 3 insertions(+), 11 deletions(-)

diff --git a/drivers/iommu/intel/svm.c b/drivers/iommu/intel/svm.c
index f9b1f13bd068..03406395ac5b 100644
--- a/drivers/iommu/intel/svm.c
+++ b/drivers/iommu/intel/svm.c
@@ -289,10 +289,11 @@ static int pasid_to_svm_sdev(struct device *dev, unsigned int pasid,
 	return 0;
 }
 
-static int intel_svm_bind_mm(struct intel_iommu *iommu, struct device *dev,
-			     struct iommu_domain *domain, ioasid_t pasid)
+static int intel_svm_set_dev_pasid(struct iommu_domain *domain,
+				   struct device *dev, ioasid_t pasid)
 {
 	struct device_domain_info *info = dev_iommu_priv_get(dev);
+	struct intel_iommu *iommu = info->iommu;
 	struct mm_struct *mm = domain->mm;
 	struct intel_svm_dev *sdev;
 	struct intel_svm *svm;
@@ -784,15 +785,6 @@ int intel_svm_page_response(struct device *dev,
 	return ret;
 }
 
-static int intel_svm_set_dev_pasid(struct iommu_domain *domain,
-				   struct device *dev, ioasid_t pasid)
-{
-	struct device_domain_info *info = dev_iommu_priv_get(dev);
-	struct intel_iommu *iommu = info->iommu;
-
-	return intel_svm_bind_mm(iommu, dev, domain, pasid);
-}
-
 static void intel_svm_domain_free(struct iommu_domain *domain)
 {
 	kfree(to_dmar_domain(domain));
-- 
2.39.3