/* * trace_export.c - export basic ftrace utilities to user space * * Copyright (C) 2009 Steven Rostedt <srostedt@redhat.com> */#include <linux/stringify.h>#include <linux/kallsyms.h>#include <linux/seq_file.h>#include <linux/debugfs.h>#include <linux/uaccess.h>#include <linux/ftrace.h>#include <linux/module.h>#include <linux/init.h>#include <linux/fs.h> #include "trace_output.h" #undef TRACE_SYSTEM#define TRACE_SYSTEM	ftrace /* not needed for this file */#undef __field_struct#define __field_struct(type, item) #undef __field#define __field(type, item)				type item; #undef __field_desc#define __field_desc(type, container, item)		type item; #undef __array#define __array(type, item, size)			type item[size]; #undef __array_desc#define __array_desc(type, container, item, size)	type item[size]; #undef __dynamic_array#define __dynamic_array(type, item)			type item[]; #undef F_STRUCT#define F_STRUCT(args...)				args #undef F_printk#define F_printk(fmt, args...) fmt, args #undef FTRACE_ENTRY#define FTRACE_ENTRY(name, struct_name, id, tstruct, print)	\struct ____ftrace_##name {					\	tstruct							\};								\static void __used ____ftrace_check_##name(void)		\{								\	struct ____ftrace_##name *__entry = NULL;		\								\	/* force cmpile-time check on F_printk() */		\	printk(print);						\} #undef FTRACE_ENTRY_DUP#define FTRACE_ENTRY_DUP(name, struct_name, id, tstruct, print)	\	FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print)) #include "trace_entries.h"  #undef __field#define __field(type, item)						\	ret = trace_seq_printf(s, "\tfield:" #type " " #item ";\t"	\			       "offset:%zu;\tsize:%zu;\n",		\			       offsetof(typeof(field), item),		\			       sizeof(field.item));			\	if (!ret)							\		return 0; #undef __field_desc#define __field_desc(type, container, item)				\	ret = trace_seq_printf(s, "\tfield:" #type " " #item ";\t"	\			       "offset:%zu;\tsize:%zu;\n",		\			       offsetof(typeof(field), container.item),	\			       sizeof(field.container.item));		\	if (!ret)							\		return 0; #undef __array#define __array(type, item, len)					\	ret = trace_seq_printf(s, "\tfield:" #type " " #item "[" #len "];\t" \			       "offset:%zu;\tsize:%zu;\n",		\			       offsetof(typeof(field), item),	\			       sizeof(field.item));		\	if (!ret)							\		return 0; #undef __array_desc#define __array_desc(type, container, item, len)			\	ret = trace_seq_printf(s, "\tfield:" #type " " #item "[" #len "];\t" \			       "offset:%zu;\tsize:%zu;\n",		\			       offsetof(typeof(field), container.item),	\			       sizeof(field.container.item));		\	if (!ret)							\		return 0; #undef __dynamic_array#define __dynamic_array(type, item)					\	ret = trace_seq_printf(s, "\tfield:" #type " " #item ";\t"	\			       "offset:%zu;\tsize:0;\n",		\			       offsetof(typeof(field), item));		\	if (!ret)							\		return 0; #undef F_printk#define F_printk(fmt, args...) "%s, %s\n", #fmt, __stringify(args) #undef __entry#define __entry REC #undef FTRACE_ENTRY#define FTRACE_ENTRY(name, struct_name, id, tstruct, print)		\static int								\ftrace_format_##name(struct ftrace_event_call *unused,			\		     struct trace_seq *s)				\{									\	struct struct_name field __attribute__((unused));		\	int ret = 0;							\									\	tstruct;							\									\	trace_seq_printf(s, "\nprint fmt: " print);			\									\	return ret;							\} #include "trace_entries.h"  #undef __field#define __field(type, item)						\	ret = trace_define_field(event_call, #type, #item,		\				 offsetof(typeof(field), item),		\				 sizeof(field.item),			\				 is_signed_type(type), FILTER_OTHER);	\	if (ret)							\		return ret; #undef __field_desc#define __field_desc(type, container, item)	\	ret = trace_define_field(event_call, #type, #item,		\				 offsetof(typeof(field),		\					  container.item),		\				 sizeof(field.container.item),		\				 is_signed_type(type), FILTER_OTHER);	\	if (ret)							\		return ret; #undef __array#define __array(type, item, len)					\	BUILD_BUG_ON(len > MAX_FILTER_STR_VAL);				\	ret = trace_define_field(event_call, #type "[" #len "]", #item,	\				 offsetof(typeof(field), item),		\				 sizeof(field.item), 0, FILTER_OTHER);	\	if (ret)							\		return ret; #undef __array_desc#define __array_desc(type, container, item, len)			\	BUILD_BUG_ON(len > MAX_FILTER_STR_VAL);				\	ret = trace_define_field(event_call, #type "[" #len "]", #item,	\				 offsetof(typeof(field),		\					  container.item),		\				 sizeof(field.container.item), 0,	\				 FILTER_OTHER);				\	if (ret)							\		return ret; #undef __dynamic_array#define __dynamic_array(type, item) #undef FTRACE_ENTRY#define FTRACE_ENTRY(name, struct_name, id, tstruct, print)		\int									\ftrace_define_fields_##name(struct ftrace_event_call *event_call)	\{									\	struct struct_name field;					\	int ret;							\									\	ret = trace_define_common_fields(event_call);			\	if (ret)							\		return ret;						\									\	tstruct;							\									\	return ret;							\} #include "trace_entries.h"  #undef __field#define __field(type, item) #undef __field_desc#define __field_desc(type, container, item) #undef __array#define __array(type, item, len) #undef __array_desc#define __array_desc(type, container, item, len) #undef __dynamic_array#define __dynamic_array(type, item) #undef FTRACE_ENTRY#define FTRACE_ENTRY(call, struct_name, type, tstruct, print)		\static int ftrace_raw_init_event_##call(void);				\									\struct ftrace_event_call __used						\__attribute__((__aligned__(4)))						\__attribute__((section("_ftrace_events"))) event_##call = {		\	.name			= #call,				\	.id			= type,					\	.system			= __stringify(TRACE_SYSTEM),		\	.raw_init		= ftrace_raw_init_event_##call,		\	.show_format		= ftrace_format_##call,			\	.define_fields		= ftrace_define_fields_##call,		\};									\static int ftrace_raw_init_event_##call(void)				\{									\	INIT_LIST_HEAD(&event_##call.fields);				\	return 0;							\}									\ #include "trace_entries.h"