summaryrefslogtreecommitdiff
path: root/kernel/trace/trace_export.c
blob: 458e5bfe26d0f700a9a913b204d53d761ae69b7f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
/*
 * 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 __always_unused ____ftrace_check_##name(void)	\
{								\
	struct ____ftrace_##name *__entry = NULL;		\
								\
	/* force compile-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;\tsigned:%u;\n",	\
			       offsetof(typeof(field), item),		\
			       sizeof(field.item), is_signed_type(type)); \
	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;\tsigned:%u;\n",	\
			       offsetof(typeof(field), container.item),	\
			       sizeof(field.container.item),		\
			       is_signed_type(type));			\
	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;\tsigned:%u;\n",	\
			       offsetof(typeof(field), item),		\
			       sizeof(field.item), is_signed_type(type)); \
	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;\tsigned:%u;\n",	\
			       offsetof(typeof(field), container.item),	\
			       sizeof(field.container.item),		\
			       is_signed_type(type));			\
	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;\tsigned:%u;\n",	\
			       offsetof(typeof(field), item),		\
			       is_signed_type(type));			\
	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;							\
									\
	tstruct;							\
									\
	return ret;							\
}

#include "trace_entries.h"

static int ftrace_raw_init_event(struct ftrace_event_call *call)
{
	INIT_LIST_HEAD(&call->fields);
	return 0;
}

#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)		\
									\
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,		\
	.show_format		= ftrace_format_##call,			\
	.define_fields		= ftrace_define_fields_##call,		\
};									\

#include "trace_entries.h"