Root/kernel/trace/trace_export.c

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) \
48struct ____ftrace_##name { \
49    tstruct \
50}; \
51static void __always_unused ____ftrace_check_##name(void) \
52{ \
53    struct ____ftrace_##name *__entry = NULL; \
54                                \
55    /* force compile-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#undef __field
66#define __field(type, item) \
67    ret = trace_define_field(event_call, #type, #item, \
68                 offsetof(typeof(field), item), \
69                 sizeof(field.item), \
70                 is_signed_type(type), FILTER_OTHER); \
71    if (ret) \
72        return ret;
73
74#undef __field_desc
75#define __field_desc(type, container, item) \
76    ret = trace_define_field(event_call, #type, #item, \
77                 offsetof(typeof(field), \
78                      container.item), \
79                 sizeof(field.container.item), \
80                 is_signed_type(type), FILTER_OTHER); \
81    if (ret) \
82        return ret;
83
84#undef __array
85#define __array(type, item, len) \
86    do { \
87        BUILD_BUG_ON(len > MAX_FILTER_STR_VAL); \
88        mutex_lock(&event_storage_mutex); \
89        snprintf(event_storage, sizeof(event_storage), \
90             "%s[%d]", #type, len); \
91        ret = trace_define_field(event_call, event_storage, #item, \
92                 offsetof(typeof(field), item), \
93                 sizeof(field.item), \
94                 is_signed_type(type), FILTER_OTHER); \
95        mutex_unlock(&event_storage_mutex); \
96        if (ret) \
97            return ret; \
98    } while (0);
99
100#undef __array_desc
101#define __array_desc(type, container, item, len) \
102    BUILD_BUG_ON(len > MAX_FILTER_STR_VAL); \
103    ret = trace_define_field(event_call, #type "[" #len "]", #item, \
104                 offsetof(typeof(field), \
105                      container.item), \
106                 sizeof(field.container.item), \
107                 is_signed_type(type), FILTER_OTHER); \
108    if (ret) \
109        return ret;
110
111#undef __dynamic_array
112#define __dynamic_array(type, item) \
113    ret = trace_define_field(event_call, #type, #item, \
114                 offsetof(typeof(field), item), \
115                 0, is_signed_type(type), FILTER_OTHER);\
116    if (ret) \
117        return ret;
118
119#undef FTRACE_ENTRY
120#define FTRACE_ENTRY(name, struct_name, id, tstruct, print) \
121int \
122ftrace_define_fields_##name(struct ftrace_event_call *event_call) \
123{ \
124    struct struct_name field; \
125    int ret; \
126                                    \
127    tstruct; \
128                                    \
129    return ret; \
130}
131
132#include "trace_entries.h"
133
134#undef __entry
135#define __entry REC
136
137#undef __field
138#define __field(type, item)
139
140#undef __field_desc
141#define __field_desc(type, container, item)
142
143#undef __array
144#define __array(type, item, len)
145
146#undef __array_desc
147#define __array_desc(type, container, item, len)
148
149#undef __dynamic_array
150#define __dynamic_array(type, item)
151
152#undef F_printk
153#define F_printk(fmt, args...) #fmt ", " __stringify(args)
154
155#undef FTRACE_ENTRY
156#define FTRACE_ENTRY(call, struct_name, etype, tstruct, print) \
157                                    \
158struct ftrace_event_class event_class_ftrace_##call = { \
159    .system = __stringify(TRACE_SYSTEM), \
160    .define_fields = ftrace_define_fields_##call, \
161    .fields = LIST_HEAD_INIT(event_class_ftrace_##call.fields),\
162}; \
163                                    \
164struct ftrace_event_call __used event_##call = { \
165    .name = #call, \
166    .event.type = etype, \
167    .class = &event_class_ftrace_##call, \
168    .print_fmt = print, \
169}; \
170struct ftrace_event_call __used \
171__attribute__((section("_ftrace_events"))) *__event_##call = &event_##call;
172
173#include "trace_entries.h"
174

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