[mirror_ubuntu-zesty-kernel.git] / kernel / trace / trace_export.c

/*
 * 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_STRUCT
#define TRACE_STRUCT(args...) args

#undef TRACE_FIELD
#define TRACE_FIELD(type, item, assign)					\
	ret = trace_seq_printf(s, "\tfield:" #type " " #item ";\t"	\
			       "offset:%u;\tsize:%u;\n",		\
			       (unsigned int)offsetof(typeof(field), item), \
			       (unsigned int)sizeof(field.item));	\
	if (!ret)							\
		return 0;


#undef TRACE_FIELD_SPECIAL
#define TRACE_FIELD_SPECIAL(type_item, item, len, cmd)			\
	ret = trace_seq_printf(s, "\tfield special:" #type_item ";\t"	\
			       "offset:%u;\tsize:%u;\n",		\
			       (unsigned int)offsetof(typeof(field), item), \
			       (unsigned int)sizeof(field.item));	\
	if (!ret)							\
		return 0;

#undef TRACE_FIELD_ZERO_CHAR
#define TRACE_FIELD_ZERO_CHAR(item)					\
	ret = trace_seq_printf(s, "\tfield:char " #item ";\t"		\
			       "offset:%u;\tsize:0;\n",			\
			       (unsigned int)offsetof(typeof(field), item)); \
	if (!ret)							\
		return 0;


#undef TP_RAW_FMT
#define TP_RAW_FMT(args...) args

#undef TRACE_EVENT_FORMAT
#define TRACE_EVENT_FORMAT(call, proto, args, fmt, tstruct, tpfmt)	\
static int								\
ftrace_format_##call(struct trace_seq *s)				\
{									\
	struct args field;						\
	int ret;							\
									\
	tstruct;							\
									\
	trace_seq_printf(s, "\nprint fmt: \"%s\"\n", tpfmt);		\
									\
	return ret;							\
}

#include "trace_event_types.h"

#undef TRACE_ZERO_CHAR
#define TRACE_ZERO_CHAR(arg)

#undef TRACE_FIELD
#define TRACE_FIELD(type, item, assign)\
	entry->item = assign;

#undef TRACE_FIELD
#define TRACE_FIELD(type, item, assign)\
	entry->item = assign;

#undef TP_CMD
#define TP_CMD(cmd...)	cmd

#undef TRACE_ENTRY
#define TRACE_ENTRY	entry

#undef TRACE_FIELD_SPECIAL
#define TRACE_FIELD_SPECIAL(type_item, item, len, cmd)	\
	cmd;

#undef TRACE_EVENT_FORMAT
#define TRACE_EVENT_FORMAT(call, proto, args, fmt, tstruct, tpfmt)	\
int ftrace_define_fields_##call(void);					\
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			= proto,				\
	.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_event_types.h"

#undef TRACE_FIELD
#define TRACE_FIELD(type, item, assign)					\
	ret = trace_define_field(event_call, #type, #item,		\
				 offsetof(typeof(field), item),		\
				 sizeof(field.item));			\
	if (ret)							\
		return ret;

#undef TRACE_FIELD_SPECIAL
#define TRACE_FIELD_SPECIAL(type, item, len, cmd)			\
	ret = trace_define_field(event_call, #type "[" #len "]", #item,	\
				 offsetof(typeof(field), item),		\
				 sizeof(field.item));			\
	if (ret)							\
		return ret;

#undef TRACE_FIELD_ZERO_CHAR
#define TRACE_FIELD_ZERO_CHAR(item)

#undef TRACE_EVENT_FORMAT
#define TRACE_EVENT_FORMAT(call, proto, args, fmt, tstruct, tpfmt)	\
int									\
ftrace_define_fields_##call(void)					\
{									\
	struct ftrace_event_call *event_call = &event_##call;		\
	struct args field;						\
	int ret;							\
									\
	__common_field(unsigned char, type);				\
	__common_field(unsigned char, flags);				\
	__common_field(unsigned char, preempt_count);			\
	__common_field(int, pid);					\
	__common_field(int, tgid);					\
									\
	tstruct;							\
									\
	return ret;							\
}

#include "trace_event_types.h"
Commit	Line	Data
770cb243 SR	1	/*
	2	* trace_export.c - export basic ftrace utilities to user space
	3	*
	4	* Copyright (C) 2009 Steven Rostedt <srostedt@redhat.com>
	5	*/
	6	#include <linux/stringify.h>
	7	#include <linux/kallsyms.h>
	8	#include <linux/seq_file.h>
	9	#include <linux/debugfs.h>
	10	#include <linux/uaccess.h>
	11	#include <linux/ftrace.h>
	12	#include <linux/module.h>
	13	#include <linux/init.h>
	14	#include <linux/fs.h>
	15
	16	#include "trace_output.h"
	17
da4d0302 SR	18
	19	#undef TRACE_STRUCT
	20	#define TRACE_STRUCT(args...) args
	21
	22	#undef TRACE_FIELD
	23	#define TRACE_FIELD(type, item, assign) \
	24	ret = trace_seq_printf(s, "\tfield:" #type " " #item ";\t" \
	25	"offset:%u;\tsize:%u;\n", \
	26	(unsigned int)offsetof(typeof(field), item), \
	27	(unsigned int)sizeof(field.item)); \
	28	if (!ret) \
	29	return 0;
	30
	31
	32	#undef TRACE_FIELD_SPECIAL
e1112b4d	33	#define TRACE_FIELD_SPECIAL(type_item, item, len, cmd) \
da4d0302 SR	34	ret = trace_seq_printf(s, "\tfield special:" #type_item ";\t" \
	35	"offset:%u;\tsize:%u;\n", \
	36	(unsigned int)offsetof(typeof(field), item), \
	37	(unsigned int)sizeof(field.item)); \
	38	if (!ret) \
	39	return 0;
770cb243 SR	40
770cb243 SR	41	#undef TRACE_FIELD_ZERO_CHAR
156b5f17	42	#define TRACE_FIELD_ZERO_CHAR(item) \
1bbe2a83	43	ret = trace_seq_printf(s, "\tfield:char " #item ";\t" \
156b5f17 SR	44	"offset:%u;\tsize:0;\n", \
	45	(unsigned int)offsetof(typeof(field), item)); \
	46	if (!ret) \
770cb243 SR	47	return 0;
	48
	49
2939b046 SR	50	#undef TP_RAW_FMT
2939b046 SR	51	#define TP_RAW_FMT(args...) args
770cb243 SR	52
	53	#undef TRACE_EVENT_FORMAT
	54	#define TRACE_EVENT_FORMAT(call, proto, args, fmt, tstruct, tpfmt) \
	55	static int \
	56	ftrace_format_##call(struct trace_seq *s) \
	57	{ \
	58	struct args field; \
	59	int ret; \
	60	\
	61	tstruct; \
	62	\
	63	trace_seq_printf(s, "\nprint fmt: \"%s\"\n", tpfmt); \
	64	\
	65	return ret; \
	66	}
	67
	68	#include "trace_event_types.h"
	69
	70	#undef TRACE_ZERO_CHAR
	71	#define TRACE_ZERO_CHAR(arg)
	72
	73	#undef TRACE_FIELD
	74	#define TRACE_FIELD(type, item, assign)\
	75	entry->item = assign;
	76
	77	#undef TRACE_FIELD
	78	#define TRACE_FIELD(type, item, assign)\
	79	entry->item = assign;
	80
2939b046 SR	81	#undef TP_CMD
2939b046 SR	82	#define TP_CMD(cmd...) cmd
770cb243 SR	83
	84	#undef TRACE_ENTRY
	85	#define TRACE_ENTRY entry
	86
	87	#undef TRACE_FIELD_SPECIAL
e1112b4d	88	#define TRACE_FIELD_SPECIAL(type_item, item, len, cmd) \
770cb243 SR	89	cmd;
	90
	91	#undef TRACE_EVENT_FORMAT
	92	#define TRACE_EVENT_FORMAT(call, proto, args, fmt, tstruct, tpfmt) \
e1112b4d TZ	93	int ftrace_define_fields_##call(void); \
e1112b4d TZ	94	static int ftrace_raw_init_event_##call(void); \
770cb243	95	\
e1112b4d	96	struct ftrace_event_call __used \
770cb243 SR	97	__attribute__((__aligned__(4))) \
770cb243 SR	98	__attribute__((section("_ftrace_events"))) event_##call = { \
ef18012b	99	.name = #call, \
770cb243 SR	100	.id = proto, \
770cb243 SR	101	.system = __stringify(TRACE_SYSTEM), \
e1112b4d	102	.raw_init = ftrace_raw_init_event_##call, \
770cb243	103	.show_format = ftrace_format_##call, \
e1112b4d TZ	104	.define_fields = ftrace_define_fields_##call, \
	105	}; \
	106	static int ftrace_raw_init_event_##call(void) \
	107	{ \
	108	INIT_LIST_HEAD(&event_##call.fields); \
	109	return 0; \
	110	} \
	111
	112	#include "trace_event_types.h"
	113
	114	#undef TRACE_FIELD
	115	#define TRACE_FIELD(type, item, assign) \
	116	ret = trace_define_field(event_call, #type, #item, \
	117	offsetof(typeof(field), item), \
	118	sizeof(field.item)); \
	119	if (ret) \
	120	return ret;
	121
	122	#undef TRACE_FIELD_SPECIAL
	123	#define TRACE_FIELD_SPECIAL(type, item, len, cmd) \
	124	ret = trace_define_field(event_call, #type "[" #len "]", #item, \
	125	offsetof(typeof(field), item), \
	126	sizeof(field.item)); \
	127	if (ret) \
	128	return ret;
	129
	130	#undef TRACE_FIELD_ZERO_CHAR
	131	#define TRACE_FIELD_ZERO_CHAR(item)
	132
	133	#undef TRACE_EVENT_FORMAT
	134	#define TRACE_EVENT_FORMAT(call, proto, args, fmt, tstruct, tpfmt) \
	135	int \
	136	ftrace_define_fields_##call(void) \
	137	{ \
	138	struct ftrace_event_call *event_call = &event_##call; \
	139	struct args field; \
	140	int ret; \
	141	\
	142	__common_field(unsigned char, type); \
	143	__common_field(unsigned char, flags); \
	144	__common_field(unsigned char, preempt_count); \
	145	__common_field(int, pid); \
	146	__common_field(int, tgid); \
	147	\
	148	tstruct; \
	149	\
	150	return ret; \
770cb243	151	}
e1112b4d	152
770cb243	153	#include "trace_event_types.h"