iommu: Remove IOMMU_DEV_FEAT_SVA

None of the drivers implement anything here anymore, remove the dead code.

Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Yi Liu <yi.l.liu@intel.com>
Tested-by: Zhangfei Gao <zhangfei.gao@linaro.org>
Link: https://lore.kernel.org/r/20250418080130.1844424-3-baolu.lu@linux.intel.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>

Author: jgunthorpe

drivers/accel/amdxdna/aie2_pci.c

@@ -512,12 +512,6 @@ static int aie2_init(struct amdxdna_dev *xdna)
 		goto release_fw;
 	}
 
-	ret = iommu_dev_enable_feature(&pdev->dev, IOMMU_DEV_FEAT_SVA);
-	if (ret) {
-		XDNA_ERR(xdna, "Enable PASID failed, ret %d", ret);
-		goto free_irq;
-	}
-
 	psp_conf.fw_size = fw->size;
 	psp_conf.fw_buf = fw->data;
 	for (i = 0; i < PSP_MAX_REGS; i++)
@@ -526,14 +520,14 @@ static int aie2_init(struct amdxdna_dev *xdna)
 	if (!ndev->psp_hdl) {
 		XDNA_ERR(xdna, "failed to create psp");
 		ret = -ENOMEM;
-		goto disable_sva;
+		goto free_irq;
 	}
 	xdna->dev_handle = ndev;
 
 	ret = aie2_hw_start(xdna);
 	if (ret) {
 		XDNA_ERR(xdna, "start npu failed, ret %d", ret);
-		goto disable_sva;
+		goto free_irq;
 	}
 
 	ret = aie2_mgmt_fw_query(ndev);
@@ -584,8 +578,6 @@ static int aie2_init(struct amdxdna_dev *xdna)
 	aie2_error_async_events_free(ndev);
 stop_hw:
 	aie2_hw_stop(xdna);
-disable_sva:
-	iommu_dev_disable_feature(&pdev->dev, IOMMU_DEV_FEAT_SVA);
 free_irq:
 	pci_free_irq_vectors(pdev);
 release_fw:
@@ -601,7 +593,6 @@ static void aie2_fini(struct amdxdna_dev *xdna)
 
 	aie2_hw_stop(xdna);
 	aie2_error_async_events_free(ndev);
-	iommu_dev_disable_feature(&pdev->dev, IOMMU_DEV_FEAT_SVA);
 	pci_free_irq_vectors(pdev);
 }
 

drivers/dma/idxd/init.c

@@ -633,17 +633,11 @@ static int idxd_enable_sva(struct pci_dev *pdev)
 	ret = iommu_dev_enable_feature(&pdev->dev, IOMMU_DEV_FEAT_IOPF);
 	if (ret)
 		return ret;
-
-	ret = iommu_dev_enable_feature(&pdev->dev, IOMMU_DEV_FEAT_SVA);
-	if (ret)
-		iommu_dev_disable_feature(&pdev->dev, IOMMU_DEV_FEAT_IOPF);
-
-	return ret;
+	return 0;
 }
 
 static void idxd_disable_sva(struct pci_dev *pdev)
 {
-	iommu_dev_disable_feature(&pdev->dev, IOMMU_DEV_FEAT_SVA);
 	iommu_dev_disable_feature(&pdev->dev, IOMMU_DEV_FEAT_IOPF);
 }
 

drivers/iommu/amd/iommu.c

@@ -2991,7 +2991,6 @@ static int amd_iommu_dev_enable_feature(struct device *dev,
 
 	switch (feat) {
 	case IOMMU_DEV_FEAT_IOPF:
-	case IOMMU_DEV_FEAT_SVA:
 		break;
 	default:
 		ret = -EINVAL;
@@ -3007,7 +3006,6 @@ static int amd_iommu_dev_disable_feature(struct device *dev,
 
 	switch (feat) {
 	case IOMMU_DEV_FEAT_IOPF:
-	case IOMMU_DEV_FEAT_SVA:
 		break;
 	default:
 		ret = -EINVAL;

drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c

@@ -3653,7 +3653,6 @@ static int arm_smmu_dev_enable_feature(struct device *dev,
 
 	switch (feat) {
 	case IOMMU_DEV_FEAT_IOPF:
-	case IOMMU_DEV_FEAT_SVA:
 		return 0;
 	default:
 		return -EINVAL;
@@ -3670,7 +3669,6 @@ static int arm_smmu_dev_disable_feature(struct device *dev,
 
 	switch (feat) {
 	case IOMMU_DEV_FEAT_IOPF:
-	case IOMMU_DEV_FEAT_SVA:
 		return 0;
 	default:
 		return -EINVAL;

drivers/iommu/intel/iommu.c

@@ -3950,9 +3950,6 @@ intel_iommu_dev_enable_feat(struct device *dev, enum iommu_dev_features feat)
 	case IOMMU_DEV_FEAT_IOPF:
 		return intel_iommu_enable_iopf(dev);
 
-	case IOMMU_DEV_FEAT_SVA:
-		return 0;
-
 	default:
 		return -ENODEV;
 	}
@@ -3966,9 +3963,6 @@ intel_iommu_dev_disable_feat(struct device *dev, enum iommu_dev_features feat)
 		intel_iommu_disable_iopf(dev);
 		return 0;
 
-	case IOMMU_DEV_FEAT_SVA:
-		return 0;
-
 	default:
 		return -ENODEV;
 	}

drivers/iommu/iommu-sva.c

@@ -63,9 +63,6 @@ static struct iommu_mm_data *iommu_alloc_mm_data(struct mm_struct *mm, struct de
  * reference is taken. Caller must call iommu_sva_unbind_device()
  * to release each reference.
  *
- * iommu_dev_enable_feature(dev, IOMMU_DEV_FEAT_SVA) must be called first, to
- * initialize the required SVA features.
- *
  * On error, returns an ERR_PTR value.
  */
 struct iommu_sva *iommu_sva_bind_device(struct device *dev, struct mm_struct *mm)

drivers/misc/uacce/uacce.c

@@ -479,14 +479,6 @@ static unsigned int uacce_enable_sva(struct device *parent, unsigned int flags)
 		dev_err(parent, "failed to enable IOPF feature! ret = %pe\n", ERR_PTR(ret));
 		return flags;
 	}
-
-	ret = iommu_dev_enable_feature(parent, IOMMU_DEV_FEAT_SVA);
-	if (ret) {
-		dev_err(parent, "failed to enable SVA feature! ret = %pe\n", ERR_PTR(ret));
-		iommu_dev_disable_feature(parent, IOMMU_DEV_FEAT_IOPF);
-		return flags;
-	}
-
 	return flags | UACCE_DEV_SVA;
 }
 
@@ -495,7 +487,6 @@ static void uacce_disable_sva(struct uacce_device *uacce)
 	if (!(uacce->flags & UACCE_DEV_SVA))
 		return;
 
-	iommu_dev_disable_feature(uacce->parent, IOMMU_DEV_FEAT_SVA);
 	iommu_dev_disable_feature(uacce->parent, IOMMU_DEV_FEAT_IOPF);
 }
 

include/linux/iommu.h

@@ -318,18 +318,11 @@ struct iommu_iort_rmr_data {
 
 /**
  * enum iommu_dev_features - Per device IOMMU features
- * @IOMMU_DEV_FEAT_SVA: Shared Virtual Addresses
- * @IOMMU_DEV_FEAT_IOPF: I/O Page Faults such as PRI or Stall. Generally
- *			 enabling %IOMMU_DEV_FEAT_SVA requires
- *			 %IOMMU_DEV_FEAT_IOPF, but some devices manage I/O Page
- *			 Faults themselves instead of relying on the IOMMU. When
- *			 supported, this feature must be enabled before and
- *			 disabled after %IOMMU_DEV_FEAT_SVA.
+ * @IOMMU_DEV_FEAT_IOPF: I/O Page Faults such as PRI or Stall.
  *
  * Device drivers enable a feature using iommu_dev_enable_feature().
  */
 enum iommu_dev_features {
-	IOMMU_DEV_FEAT_SVA,
 	IOMMU_DEV_FEAT_IOPF,
 };