iommu/amd: Remove amd_iommu_device_info()

No one is using this function. Hence remove it. Also move PCI device
feature detection flags to amd_iommu_types.h as its only used inside
AMD IOMMU driver.

Signed-off-by: Vasant Hegde <vasant.hegde@amd.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Jerry Snitselaar <jsnitsel@redhat.com>
Tested-by: Alex Deucher <alexander.deucher@amd.com>
Link: https://lore.kernel.org/r/20231006095706.5694-4-vasant.hegde@amd.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>

Author: hegdevasant

drivers/iommu/amd/amd_iommu_types.h

@@ -786,6 +786,14 @@ struct devid_map {
 	bool cmd_line;
 };
 
+#define AMD_IOMMU_DEVICE_FLAG_ATS_SUP     0x1    /* ATS feature supported */
+#define AMD_IOMMU_DEVICE_FLAG_PRI_SUP     0x2    /* PRI feature supported */
+#define AMD_IOMMU_DEVICE_FLAG_PASID_SUP   0x4    /* PASID context supported */
+/* Device may request execution on memory pages */
+#define AMD_IOMMU_DEVICE_FLAG_EXEC_SUP    0x8
+/* Device may request super-user privileges */
+#define AMD_IOMMU_DEVICE_FLAG_PRIV_SUP   0x10
+
 /*
  * This struct contains device specific data for the IOMMU
  */

drivers/iommu/amd/iommu.c

@@ -2741,48 +2741,6 @@ int amd_iommu_complete_ppr(struct pci_dev *pdev, u32 pasid,
 }
 EXPORT_SYMBOL(amd_iommu_complete_ppr);
 
-int amd_iommu_device_info(struct pci_dev *pdev,
-                          struct amd_iommu_device_info *info)
-{
-	int max_pasids;
-	int pos;
-
-	if (pdev == NULL || info == NULL)
-		return -EINVAL;
-
-	if (!amd_iommu_v2_supported())
-		return -EINVAL;
-
-	memset(info, 0, sizeof(*info));
-
-	if (pci_ats_supported(pdev))
-		info->flags |= AMD_IOMMU_DEVICE_FLAG_ATS_SUP;
-
-	pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PRI);
-	if (pos)
-		info->flags |= AMD_IOMMU_DEVICE_FLAG_PRI_SUP;
-
-	pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PASID);
-	if (pos) {
-		int features;
-
-		max_pasids = 1 << (9 * (amd_iommu_max_glx_val + 1));
-		max_pasids = min(max_pasids, (1 << 20));
-
-		info->flags |= AMD_IOMMU_DEVICE_FLAG_PASID_SUP;
-		info->max_pasids = min(pci_max_pasids(pdev), max_pasids);
-
-		features = pci_pasid_features(pdev);
-		if (features & PCI_PASID_CAP_EXEC)
-			info->flags |= AMD_IOMMU_DEVICE_FLAG_EXEC_SUP;
-		if (features & PCI_PASID_CAP_PRIV)
-			info->flags |= AMD_IOMMU_DEVICE_FLAG_PRIV_SUP;
-	}
-
-	return 0;
-}
-EXPORT_SYMBOL(amd_iommu_device_info);
-
 #ifdef CONFIG_IRQ_REMAP
 
 /*****************************************************************************

include/linux/amd-iommu.h

@@ -33,32 +33,6 @@ struct pci_dev;
 
 extern int amd_iommu_detect(void);
 
-/**
- * amd_iommu_device_info() - Get information about IOMMUv2 support of a
- *			     PCI device
- * @pdev: PCI device to query information from
- * @info: A pointer to an amd_iommu_device_info structure which will contain
- *	  the information about the PCI device
- *
- * Returns 0 on success, negative value on error
- */
-
-#define AMD_IOMMU_DEVICE_FLAG_ATS_SUP     0x1    /* ATS feature supported */
-#define AMD_IOMMU_DEVICE_FLAG_PRI_SUP     0x2    /* PRI feature supported */
-#define AMD_IOMMU_DEVICE_FLAG_PASID_SUP   0x4    /* PASID context supported */
-#define AMD_IOMMU_DEVICE_FLAG_EXEC_SUP    0x8    /* Device may request execution
-						    on memory pages */
-#define AMD_IOMMU_DEVICE_FLAG_PRIV_SUP   0x10    /* Device may request
-						    super-user privileges */
-
-struct amd_iommu_device_info {
-	int max_pasids;
-	u32 flags;
-};
-
-extern int amd_iommu_device_info(struct pci_dev *pdev,
-				 struct amd_iommu_device_info *info);
-
 #else /* CONFIG_AMD_IOMMU */
 
 static inline int amd_iommu_detect(void) { return -ENODEV; }