usb: gadget: configfs: add tree trace entries

diff --git a/drivers/usb/gadget/Makefile b/drivers/usb/gadget/Makefile
index 130dad7..8e9c2b8 100644
--- a/drivers/usb/gadget/Makefile
+++ b/drivers/usb/gadget/Makefile
@@ -9,5 +9,6 @@  ccflags-y				+= -I$(srctree)/drivers/usb/gadget/udc
 obj-$(CONFIG_USB_LIBCOMPOSITE)	+= libcomposite.o
 libcomposite-y			:= usbstring.o config.o epautoconf.o
 libcomposite-y			+= composite.o functions.o configfs.o u_f.o
+libcomposite-y			+= configfs_trace.o
 
 obj-$(CONFIG_USB_GADGET)	+= udc/ function/ legacy/
diff --git a/drivers/usb/gadget/configfs.c b/drivers/usb/gadget/configfs.c
index 477e72a..4024f9b 100644
--- a/drivers/usb/gadget/configfs.c
+++ b/drivers/usb/gadget/configfs.c
@@ -9,6 +9,7 @@ 
 #include "configfs.h"
 #include "u_f.h"
 #include "u_os_desc.h"
+#include "configfs_trace.h"
 
 int check_user_usb_string(const char *name,
 		struct usb_gadget_strings *stringtab_dev)
@@ -270,6 +271,8 @@  static ssize_t gadget_dev_desc_UDC_store(struct config_item *item,
 	if (name[len - 1] == '\n')
 		name[len - 1] = '\0';
 
+	trace_gadget_dev_desc_UDC_store(config_item_name(item), name);
+
 	mutex_lock(&gi->lock);
 
 	if (!strlen(name)) {
@@ -423,6 +426,10 @@  static int config_usb_cfg_link(
 	struct usb_function *f;
 	int ret;
 
+	trace_config_usb_cfg_link(config_item_name(&gi->group.cg_item),
+				config_item_name(usb_cfg_ci),
+				config_item_name(usb_func_ci));
+
 	mutex_lock(&gi->lock);
 	/*
 	 * Make sure this function is from within our _this_ gadget and not
@@ -472,6 +479,10 @@  static void config_usb_cfg_unlink(
 			struct usb_function_instance, group);
 	struct usb_function *f;
 
+	trace_config_usb_cfg_unlink(config_item_name(&gi->group.cg_item),
+				config_item_name(usb_cfg_ci),
+				config_item_name(usb_func_ci));
+
 	/*
 	 * ideally I would like to forbid to unlink functions while a gadget is
 	 * bound to an UDC. Since this isn't possible at the moment, we simply
diff --git a/drivers/usb/gadget/configfs_trace.c b/drivers/usb/gadget/configfs_trace.c
new file mode 100644
index 0000000..b74ff21
--- /dev/null
+++ b/drivers/usb/gadget/configfs_trace.c
@@ -0,0 +1,7 @@ 
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2021 Qualcomm Innovation Center, Inc. All rights reserved.
+ */
+
+#define CREATE_TRACE_POINTS
+#include "configfs_trace.h"
diff --git a/drivers/usb/gadget/configfs_trace.h b/drivers/usb/gadget/configfs_trace.h
new file mode 100644
index 0000000..82e0121
--- /dev/null
+++ b/drivers/usb/gadget/configfs_trace.h
@@ -0,0 +1,73 @@ 
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2021 Qualcomm Innovation Center, Inc. All rights reserved.
+ */
+
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM configfs_gadget
+
+#if !defined(__GADGET_TRACE_H) || defined(TRACE_HEADER_MULTI_READ)
+#define __GADGET_TRACE_H
+
+#include <linux/tracepoint.h>
+
+TRACE_EVENT(gadget_dev_desc_UDC_store,
+	TP_PROTO(char *name, char *udc),
+	TP_ARGS(name, udc),
+	TP_STRUCT__entry(
+		__string(group_name, name)
+		__string(udc_name, udc)
+	),
+	TP_fast_assign(
+		__assign_str(group_name, name);
+		__assign_str(udc_name, udc);
+	),
+	TP_printk("gadget:%s UDC:%s", __get_str(group_name),
+		__get_str(udc_name))
+);
+
+TRACE_EVENT(config_usb_cfg_link,
+	TP_PROTO(char *name, char *cfg, char *func),
+	TP_ARGS(name, cfg, func),
+	TP_STRUCT__entry(
+		__string(group_name, name)
+		__string(cfg_name, cfg)
+		__string(func_name, func)
+	),
+	TP_fast_assign(
+		__assign_str(group_name, name);
+		__assign_str(cfg_name, cfg);
+		__assign_str(func_name, func)
+	),
+	TP_printk("gadget:%s cfg:%s link func:%s", __get_str(group_name),
+		__get_str(cfg_name), __get_str(func_name))
+);
+
+TRACE_EVENT(config_usb_cfg_unlink,
+	TP_PROTO(char *name, char *cfg, char *func),
+	TP_ARGS(name, cfg, func),
+	TP_STRUCT__entry(
+		__string(group_name, name)
+		__string(cfg_name, cfg)
+		__string(func_name, func)
+	),
+	TP_fast_assign(
+		__assign_str(group_name, name);
+		__assign_str(cfg_name, cfg);
+		__assign_str(func_name, func)
+	),
+	TP_printk("gadget:%s cfg:%s unlink func:%s", __get_str(group_name),
+		__get_str(cfg_name), __get_str(func_name))
+);
+
+#endif /* __GADGET_TRACE_H */
+
+/* this part has to be here */
+
+#undef TRACE_INCLUDE_PATH
+#define TRACE_INCLUDE_PATH ../../drivers/usb/gadget
+
+#undef TRACE_INCLUDE_FILE
+#define TRACE_INCLUDE_FILE configfs_trace
+
+#include <trace/define_trace.h>