linux-kernel - [PATCH 09/12] dmaengine: idxd: Remove unnecessary IOMMU_DEV_FEAT

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Message-ID: <20250214061104.1959525-10-baolu.lu@linux.intel.com>
Date: Fri, 14 Feb 2025 14:11:01 +0800
From: Lu Baolu <baolu.lu@...ux.intel.com>
To: Joerg Roedel <joro@...tes.org>,
	Will Deacon <will@...nel.org>,
	Robin Murphy <robin.murphy@....com>,
	Jason Gunthorpe <jgg@...pe.ca>,
	Kevin Tian <kevin.tian@...el.com>
Cc: Fenghua Yu <fenghua.yu@...el.com>,
	Dave Jiang <dave.jiang@...el.com>,
	Vinod Koul <vkoul@...nel.org>,
	Zhangfei Gao <zhangfei.gao@...aro.org>,
	Zhou Wang <wangzhou1@...ilicon.com>,
	iommu@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	Lu Baolu <baolu.lu@...ux.intel.com>
Subject: [PATCH 09/12] dmaengine: idxd: Remove unnecessary IOMMU_DEV_FEAT_IOPF

The IOMMU_DEV_FEAT_IOPF implementation in the iommu driver is just a no-op.
It will also be removed from the iommu driver in the subsequent patch.
Remove it to avoid dead code.

Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
---
 drivers/dma/idxd/init.c | 37 ++++++-------------------------------
 1 file changed, 6 insertions(+), 31 deletions(-)

diff --git a/drivers/dma/idxd/init.c b/drivers/dma/idxd/init.c
index 1e5038cca22c..d44944195807 100644
--- a/drivers/dma/idxd/init.c
+++ b/drivers/dma/idxd/init.c
@@ -626,21 +626,6 @@ static void idxd_disable_system_pasid(struct idxd_device *idxd)
 	idxd->pasid = IOMMU_PASID_INVALID;
 }
 
-static int idxd_enable_sva(struct pci_dev *pdev)
-{
-	int ret;
-
-	ret = iommu_dev_enable_feature(&pdev->dev, IOMMU_DEV_FEAT_IOPF);
-	if (ret)
-		return ret;
-	return 0;
-}
-
-static void idxd_disable_sva(struct pci_dev *pdev)
-{
-	iommu_dev_disable_feature(&pdev->dev, IOMMU_DEV_FEAT_IOPF);
-}
-
 static int idxd_probe(struct idxd_device *idxd)
 {
 	struct pci_dev *pdev = idxd->pdev;
@@ -655,17 +640,13 @@ static int idxd_probe(struct idxd_device *idxd)
 	dev_dbg(dev, "IDXD reset complete\n");
 
 	if (IS_ENABLED(CONFIG_INTEL_IDXD_SVM) && sva) {
-		if (idxd_enable_sva(pdev)) {
-			dev_warn(dev, "Unable to turn on user SVA feature.\n");
-		} else {
-			set_bit(IDXD_FLAG_USER_PASID_ENABLED, &idxd->flags);
+		set_bit(IDXD_FLAG_USER_PASID_ENABLED, &idxd->flags);
 
-			rc = idxd_enable_system_pasid(idxd);
-			if (rc)
-				dev_warn(dev, "No in-kernel DMA with PASID. %d\n", rc);
-			else
-				set_bit(IDXD_FLAG_PASID_ENABLED, &idxd->flags);
-		}
+		rc = idxd_enable_system_pasid(idxd);
+		if (rc)
+			dev_warn(dev, "No in-kernel DMA with PASID. %d\n", rc);
+		else
+			set_bit(IDXD_FLAG_PASID_ENABLED, &idxd->flags);
 	} else if (!sva) {
 		dev_warn(dev, "User forced SVA off via module param.\n");
 	}
@@ -703,8 +684,6 @@ static int idxd_probe(struct idxd_device *idxd)
  err:
 	if (device_pasid_enabled(idxd))
 		idxd_disable_system_pasid(idxd);
-	if (device_user_pasid_enabled(idxd))
-		idxd_disable_sva(pdev);
 	return rc;
 }
 
@@ -715,8 +694,6 @@ static void idxd_cleanup(struct idxd_device *idxd)
 	idxd_cleanup_internals(idxd);
 	if (device_pasid_enabled(idxd))
 		idxd_disable_system_pasid(idxd);
-	if (device_user_pasid_enabled(idxd))
-		idxd_disable_sva(idxd->pdev);
 }
 
 /*
@@ -1248,8 +1225,6 @@ static void idxd_remove(struct pci_dev *pdev)
 	free_irq(irq_entry->vector, irq_entry);
 	pci_free_irq_vectors(pdev);
 	pci_iounmap(pdev, idxd->reg_base);
-	if (device_user_pasid_enabled(idxd))
-		idxd_disable_sva(pdev);
 	pci_disable_device(pdev);
 	destroy_workqueue(idxd->wq);
 	perfmon_pmu_remove(idxd);
-- 
2.43.0