[deliverable/linux.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_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"
Commit	Line	Data
	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
	18	#undef TRACE_SYSTEM
	19	#define TRACE_SYSTEM ftrace
	20
	21	/* not needed for this file */
	22	#undef __field_struct
	23	#define __field_struct(type, item)
	24
	25	#undef __field
	26	#define __field(type, item) type item;
	27
	28	#undef __field_desc
	29	#define __field_desc(type, container, item) type item;
	30
	31	#undef __array
	32	#define __array(type, item, size) type item[size];
	33
	34	#undef __array_desc
	35	#define __array_desc(type, container, item, size) type item[size];
	36
	37	#undef __dynamic_array
	38	#define __dynamic_array(type, item) type item[];
	39
	40	#undef F_STRUCT
	41	#define F_STRUCT(args...) args
	42
	43	#undef F_printk
	44	#define F_printk(fmt, args...) fmt, args
	45
	46	#undef FTRACE_ENTRY
	47	#define FTRACE_ENTRY(name, struct_name, id, tstruct, print) \
	48	struct ____ftrace_##name { \
	49	tstruct \
	50	}; \
	51	static void __used ____ftrace_check_##name(void) \
	52	{ \
	53	struct ____ftrace_##name *__entry = NULL; \
	54	\
	55	/* force cmpile-time check on F_printk() */ \
	56	printk(print); \
	57	}
	58
	59	#undef FTRACE_ENTRY_DUP
	60	#define FTRACE_ENTRY_DUP(name, struct_name, id, tstruct, print) \
	61	FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print))
	62
	63	#include "trace_entries.h"
	64
	65
	66	#undef __field
	67	#define __field(type, item) \
	68	ret = trace_seq_printf(s, "\tfield:" #type " " #item ";\t" \
	69	"offset:%zu;\tsize:%zu;\n", \
	70	offsetof(typeof(field), item), \
	71	sizeof(field.item)); \
	72	if (!ret) \
	73	return 0;
	74
	75	#undef __field_desc
	76	#define __field_desc(type, container, item) \
	77	ret = trace_seq_printf(s, "\tfield:" #type " " #item ";\t" \
	78	"offset:%zu;\tsize:%zu;\n", \
	79	offsetof(typeof(field), container.item), \
	80	sizeof(field.container.item)); \
	81	if (!ret) \
	82	return 0;
	83
	84	#undef __array
	85	#define __array(type, item, len) \
	86	ret = trace_seq_printf(s, "\tfield:" #type " " #item "[" #len "];\t" \
	87	"offset:%zu;\tsize:%zu;\n", \
	88	offsetof(typeof(field), item), \
	89	sizeof(field.item)); \
	90	if (!ret) \
	91	return 0;
	92
	93	#undef __array_desc
	94	#define __array_desc(type, container, item, len) \
	95	ret = trace_seq_printf(s, "\tfield:" #type " " #item "[" #len "];\t" \
	96	"offset:%zu;\tsize:%zu;\n", \
	97	offsetof(typeof(field), container.item), \
	98	sizeof(field.container.item)); \
	99	if (!ret) \
	100	return 0;
	101
	102	#undef __dynamic_array
	103	#define __dynamic_array(type, item) \
	104	ret = trace_seq_printf(s, "\tfield:" #type " " #item ";\t" \
	105	"offset:%zu;\tsize:0;\n", \
	106	offsetof(typeof(field), item)); \
	107	if (!ret) \
	108	return 0;
	109
	110	#undef F_printk
	111	#define F_printk(fmt, args...) "%s, %s\n", #fmt, __stringify(args)
	112
	113	#undef __entry
	114	#define __entry REC
	115
	116	#undef FTRACE_ENTRY
	117	#define FTRACE_ENTRY(name, struct_name, id, tstruct, print) \
	118	static int \
	119	ftrace_format_##name(struct ftrace_event_call *unused, \
	120	struct trace_seq *s) \
	121	{ \
	122	struct struct_name field __attribute__((unused)); \
	123	int ret = 0; \
	124	\
	125	tstruct; \
	126	\
	127	trace_seq_printf(s, "\nprint fmt: " print); \
	128	\
	129	return ret; \
	130	}
	131
	132	#include "trace_entries.h"
	133
	134
	135	#undef __field
	136	#define __field(type, item) \
	137	ret = trace_define_field(event_call, #type, #item, \
	138	offsetof(typeof(field), item), \
	139	sizeof(field.item), \
	140	is_signed_type(type), FILTER_OTHER); \
	141	if (ret) \
	142	return ret;
	143
	144	#undef __field_desc
	145	#define __field_desc(type, container, item) \
	146	ret = trace_define_field(event_call, #type, #item, \
	147	offsetof(typeof(field), \
	148	container.item), \
	149	sizeof(field.container.item), \
	150	is_signed_type(type), FILTER_OTHER); \
	151	if (ret) \
	152	return ret;
	153
	154	#undef __array
	155	#define __array(type, item, len) \
	156	BUILD_BUG_ON(len > MAX_FILTER_STR_VAL); \
	157	ret = trace_define_field(event_call, #type "[" #len "]", #item, \
	158	offsetof(typeof(field), item), \
	159	sizeof(field.item), 0, FILTER_OTHER); \
	160	if (ret) \
	161	return ret;
	162
	163	#undef __array_desc
	164	#define __array_desc(type, container, item, len) \
	165	BUILD_BUG_ON(len > MAX_FILTER_STR_VAL); \
	166	ret = trace_define_field(event_call, #type "[" #len "]", #item, \
	167	offsetof(typeof(field), \
	168	container.item), \
	169	sizeof(field.container.item), 0, \
	170	FILTER_OTHER); \
	171	if (ret) \
	172	return ret;
	173
	174	#undef __dynamic_array
	175	#define __dynamic_array(type, item)
	176
	177	#undef FTRACE_ENTRY
	178	#define FTRACE_ENTRY(name, struct_name, id, tstruct, print) \
	179	int \
	180	ftrace_define_fields_##name(struct ftrace_event_call *event_call) \
	181	{ \
	182	struct struct_name field; \
	183	int ret; \
	184	\
	185	ret = trace_define_common_fields(event_call); \
	186	if (ret) \
	187	return ret; \
	188	\
	189	tstruct; \
	190	\
	191	return ret; \
	192	}
	193
	194	#include "trace_entries.h"
	195
	196
	197	#undef __field
	198	#define __field(type, item)
	199
	200	#undef __field_desc
	201	#define __field_desc(type, container, item)
	202
	203	#undef __array
	204	#define __array(type, item, len)
	205
	206	#undef __array_desc
	207	#define __array_desc(type, container, item, len)
	208
	209	#undef __dynamic_array
	210	#define __dynamic_array(type, item)
	211
	212	#undef FTRACE_ENTRY
	213	#define FTRACE_ENTRY(call, struct_name, type, tstruct, print) \
	214	static int ftrace_raw_init_event_##call(void); \
	215	\
	216	struct ftrace_event_call __used \
	217	__attribute__((__aligned__(4))) \
	218	__attribute__((section("_ftrace_events"))) event_##call = { \
	219	.name = #call, \
	220	.id = type, \
	221	.system = __stringify(TRACE_SYSTEM), \
	222	.raw_init = ftrace_raw_init_event_##call, \
	223	.show_format = ftrace_format_##call, \
	224	.define_fields = ftrace_define_fields_##call, \
	225	}; \
	226	static int ftrace_raw_init_event_##call(void) \
	227	{ \
	228	INIT_LIST_HEAD(&event_##call.fields); \
	229	return 0; \
	230	} \
	231
	232	#include "trace_entries.h"