drm/xe: Interface xe drm client with fdinfo interface

DRM core driver has introduced recently fdinfo interface to
show memory stats of individual drm client. Lets interface
xe drm client to fdinfo interface.

V2:
  - cover call to xe_drm_client_fdinfo under PROC_FS
Reviewed-by: Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>
Signed-off-by: Tejas Upadhyay <tejas.upadhyay@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

drivers/gpu/drm/xe/xe_device.c

@@ -137,6 +137,9 @@ static const struct file_operations xe_driver_fops = {
 	.read = drm_read,
 	.compat_ioctl = drm_compat_ioctl,
 	.llseek = noop_llseek,
+#ifdef CONFIG_PROC_FS
+	.show_fdinfo = drm_show_fdinfo,
+#endif
 };
 
 static void xe_driver_release(struct drm_device *dev)
@@ -161,6 +164,9 @@ static struct drm_driver driver = {
 
 	.dumb_create = xe_bo_dumb_create,
 	.dumb_map_offset = drm_gem_ttm_dumb_map_offset,
+#ifdef CONFIG_PROC_FS
+	.show_fdinfo = xe_drm_client_fdinfo,
+#endif
 	.release = &xe_driver_release,
 
 	.ioctls = xe_ioctls,

drivers/gpu/drm/xe/xe_drm_client.c

@@ -50,3 +50,20 @@ void __xe_drm_client_free(struct kref *kref)
 
 	kfree(client);
 }
+
+#ifdef CONFIG_PROC_FS
+/**
+ * xe_drm_client_fdinfo() - Callback for fdinfo interface
+ * @p: The drm_printer ptr
+ * @file: The drm_file ptr
+ *
+ * This is callabck for drm fdinfo interface. Register this callback
+ * in drm driver ops for show_fdinfo.
+ *
+ * Return: void
+ */
+void xe_drm_client_fdinfo(struct drm_printer *p, struct drm_file *file)
+{
+	/* show_meminfo() will be developed here */
+}
+#endif

drivers/gpu/drm/xe/xe_drm_client.h

@@ -39,5 +39,7 @@ struct xe_drm_client *xe_drm_client_alloc(void);
 static inline struct xe_drm_client *
 xe_drm_client_get(struct xe_drm_client *client);
 static inline void xe_drm_client_put(struct xe_drm_client *client);
-
+#ifdef CONFIG_PROC_FS
+void xe_drm_client_fdinfo(struct drm_printer *p, struct drm_file *file);
+#endif
 #endif