drm: Mark PCI AGP helpers as legacy

DRM's AGP helpers for PCI are only required by legacy drivers. Put them
behind CONFIG_DRM_LEGACY and add the _legacy_ infix.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Christian König <christian.koenig@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210507185709.22797-4-tzimmermann@suse.de

drivers/gpu/drm/drm_drv.c

@@ -941,9 +941,7 @@ void drm_dev_unregister(struct drm_device *dev)
 	if (dev->driver->unload)
 		dev->driver->unload(dev);
 
-	if (dev->agp)
-		drm_pci_agp_destroy(dev);
-
+	drm_legacy_pci_agp_destroy(dev);
 	drm_legacy_rmmaps(dev);
 
 	remove_compat_control_link(dev);

drivers/gpu/drm/drm_internal.h

@@ -56,7 +56,6 @@ void drm_lastclose(struct drm_device *dev);
 /* drm_pci.c */
 int drm_legacy_irq_by_busid(struct drm_device *dev, void *data,
 			    struct drm_file *file_priv);
-void drm_pci_agp_destroy(struct drm_device *dev);
 int drm_pci_set_busid(struct drm_device *dev, struct drm_master *master);
 
 #else
@@ -67,10 +66,6 @@ static inline int drm_legacy_irq_by_busid(struct drm_device *dev, void *data,
 	return -EINVAL;
 }
 
-static inline void drm_pci_agp_destroy(struct drm_device *dev)
-{
-}
-
 static inline int drm_pci_set_busid(struct drm_device *dev,
 				    struct drm_master *master)
 {

drivers/gpu/drm/drm_legacy.h

@@ -211,4 +211,10 @@ void drm_master_legacy_init(struct drm_master *master);
 static inline void drm_master_legacy_init(struct drm_master *master) {}
 #endif
 
+#if IS_ENABLED(CONFIG_DRM_LEGACY) && IS_ENABLED(CONFIG_PCI)
+void drm_legacy_pci_agp_destroy(struct drm_device *dev);
+#else
+static inline void drm_legacy_pci_agp_destroy(struct drm_device *dev) {}
+#endif
+
 #endif /* __DRM_LEGACY_H__ */

drivers/gpu/drm/drm_pci.c

@@ -119,7 +119,9 @@ int drm_legacy_irq_by_busid(struct drm_device *dev, void *data,
 	return drm_pci_irq_by_busid(dev, p);
 }
 
-void drm_pci_agp_destroy(struct drm_device *dev)
+#ifdef CONFIG_DRM_LEGACY
+
+void drm_legacy_pci_agp_destroy(struct drm_device *dev)
 {
 	if (dev->agp) {
 		arch_phys_wc_del(dev->agp->agp_mtrr);
@@ -129,9 +131,7 @@ void drm_pci_agp_destroy(struct drm_device *dev)
 	}
 }
 
-#ifdef CONFIG_DRM_LEGACY
-
-static void drm_pci_agp_init(struct drm_device *dev)
+static void drm_legacy_pci_agp_init(struct drm_device *dev)
 {
 	if (drm_core_check_feature(dev, DRIVER_USE_AGP)) {
 		if (pci_find_capability(to_pci_dev(dev->dev), PCI_CAP_ID_AGP))
@@ -145,7 +145,7 @@ static void drm_pci_agp_init(struct drm_device *dev)
 	}
 }
 
-static int drm_get_pci_dev(struct pci_dev *pdev,
+static int drm_legacy_get_pci_dev(struct pci_dev *pdev,
 				  const struct pci_device_id *ent,
 				  const struct drm_driver *driver)
 {
@@ -169,7 +169,7 @@ static int drm_get_pci_dev(struct pci_dev *pdev,
 	if (drm_core_check_feature(dev, DRIVER_MODESET))
 		pci_set_drvdata(pdev, dev);
 
-	drm_pci_agp_init(dev);
+	drm_legacy_pci_agp_init(dev);
 
 	ret = drm_dev_register(dev, ent->driver_data);
 	if (ret)
@@ -184,7 +184,7 @@ static int drm_get_pci_dev(struct pci_dev *pdev,
 	return 0;
 
 err_agp:
-	drm_pci_agp_destroy(dev);
+	drm_legacy_pci_agp_destroy(dev);
 	pci_disable_device(pdev);
 err_free:
 	drm_dev_put(dev);
@@ -231,7 +231,7 @@ int drm_legacy_pci_init(const struct drm_driver *driver,
 
 			/* stealth mode requires a manual probe */
 			pci_dev_get(pdev);
-			drm_get_pci_dev(pdev, pid, driver);
+			drm_legacy_get_pci_dev(pdev, pid, driver);
 		}
 	}
 	return 0;