Merge commit 'v3.4.4' into android-tegra-nv-3.4
[linux-2.6.git] / 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 /*
22  * The FTRACE_ENTRY_REG macro allows ftrace entry to define register
23  * function and thus become accesible via perf.
24  */
25 #undef FTRACE_ENTRY_REG
26 #define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, \
27                          filter, regfn) \
28         FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \
29                      filter)
30
31 /* not needed for this file */
32 #undef __field_struct
33 #define __field_struct(type, item)
34
35 #undef __field
36 #define __field(type, item)                             type item;
37
38 #undef __field_desc
39 #define __field_desc(type, container, item)             type item;
40
41 #undef __array
42 #define __array(type, item, size)                       type item[size];
43
44 #undef __array_desc
45 #define __array_desc(type, container, item, size)       type item[size];
46
47 #undef __dynamic_array
48 #define __dynamic_array(type, item)                     type item[];
49
50 #undef F_STRUCT
51 #define F_STRUCT(args...)                               args
52
53 #undef F_printk
54 #define F_printk(fmt, args...) fmt, args
55
56 #undef FTRACE_ENTRY
57 #define FTRACE_ENTRY(name, struct_name, id, tstruct, print, filter)     \
58 struct ____ftrace_##name {                                              \
59         tstruct                                                         \
60 };                                                                      \
61 static void __always_unused ____ftrace_check_##name(void)               \
62 {                                                                       \
63         struct ____ftrace_##name *__entry = NULL;                       \
64                                                                         \
65         /* force compile-time check on F_printk() */                    \
66         printk(print);                                                  \
67 }
68
69 #undef FTRACE_ENTRY_DUP
70 #define FTRACE_ENTRY_DUP(name, struct_name, id, tstruct, print, filter) \
71         FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \
72                      filter)
73
74 #include "trace_entries.h"
75
76 #undef __field
77 #define __field(type, item)                                             \
78         ret = trace_define_field(event_call, #type, #item,              \
79                                  offsetof(typeof(field), item),         \
80                                  sizeof(field.item),                    \
81                                  is_signed_type(type), filter_type);    \
82         if (ret)                                                        \
83                 return ret;
84
85 #undef __field_desc
86 #define __field_desc(type, container, item)     \
87         ret = trace_define_field(event_call, #type, #item,              \
88                                  offsetof(typeof(field),                \
89                                           container.item),              \
90                                  sizeof(field.container.item),          \
91                                  is_signed_type(type), filter_type);    \
92         if (ret)                                                        \
93                 return ret;
94
95 #undef __array
96 #define __array(type, item, len)                                        \
97         do {                                                            \
98                 BUILD_BUG_ON(len > MAX_FILTER_STR_VAL);                 \
99                 mutex_lock(&event_storage_mutex);                       \
100                 snprintf(event_storage, sizeof(event_storage),          \
101                          "%s[%d]", #type, len);                         \
102                 ret = trace_define_field(event_call, event_storage, #item, \
103                                  offsetof(typeof(field), item),         \
104                                  sizeof(field.item),                    \
105                                  is_signed_type(type), filter_type);    \
106                 mutex_unlock(&event_storage_mutex);                     \
107                 if (ret)                                                \
108                         return ret;                                     \
109         } while (0);
110
111 #undef __array_desc
112 #define __array_desc(type, container, item, len)                        \
113         BUILD_BUG_ON(len > MAX_FILTER_STR_VAL);                         \
114         ret = trace_define_field(event_call, #type "[" #len "]", #item, \
115                                  offsetof(typeof(field),                \
116                                           container.item),              \
117                                  sizeof(field.container.item),          \
118                                  is_signed_type(type), filter_type);    \
119         if (ret)                                                        \
120                 return ret;
121
122 #undef __dynamic_array
123 #define __dynamic_array(type, item)                                     \
124         ret = trace_define_field(event_call, #type, #item,              \
125                                  offsetof(typeof(field), item),         \
126                                  0, is_signed_type(type), filter_type);\
127         if (ret)                                                        \
128                 return ret;
129
130 #undef FTRACE_ENTRY
131 #define FTRACE_ENTRY(name, struct_name, id, tstruct, print, filter)     \
132 int                                                                     \
133 ftrace_define_fields_##name(struct ftrace_event_call *event_call)       \
134 {                                                                       \
135         struct struct_name field;                                       \
136         int ret;                                                        \
137         int filter_type = filter;                                       \
138                                                                         \
139         tstruct;                                                        \
140                                                                         \
141         return ret;                                                     \
142 }
143
144 #include "trace_entries.h"
145
146 #undef __entry
147 #define __entry REC
148
149 #undef __field
150 #define __field(type, item)
151
152 #undef __field_desc
153 #define __field_desc(type, container, item)
154
155 #undef __array
156 #define __array(type, item, len)
157
158 #undef __array_desc
159 #define __array_desc(type, container, item, len)
160
161 #undef __dynamic_array
162 #define __dynamic_array(type, item)
163
164 #undef F_printk
165 #define F_printk(fmt, args...) __stringify(fmt) ", "  __stringify(args)
166
167 #undef FTRACE_ENTRY_REG
168 #define FTRACE_ENTRY_REG(call, struct_name, etype, tstruct, print, filter,\
169                          regfn)                                         \
170                                                                         \
171 struct ftrace_event_class event_class_ftrace_##call = {                 \
172         .system                 = __stringify(TRACE_SYSTEM),            \
173         .define_fields          = ftrace_define_fields_##call,          \
174         .fields                 = LIST_HEAD_INIT(event_class_ftrace_##call.fields),\
175         .reg                    = regfn,                                \
176 };                                                                      \
177                                                                         \
178 struct ftrace_event_call __used event_##call = {                        \
179         .name                   = #call,                                \
180         .event.type             = etype,                                \
181         .class                  = &event_class_ftrace_##call,           \
182         .print_fmt              = print,                                \
183         .flags                  = TRACE_EVENT_FL_IGNORE_ENABLE,         \
184 };                                                                      \
185 struct ftrace_event_call __used                                         \
186 __attribute__((section("_ftrace_events"))) *__event_##call = &event_##call;
187
188 #undef FTRACE_ENTRY
189 #define FTRACE_ENTRY(call, struct_name, etype, tstruct, print, filter)  \
190         FTRACE_ENTRY_REG(call, struct_name, etype,                      \
191                          PARAMS(tstruct), PARAMS(print), filter, NULL)
192
193 int ftrace_event_is_function(struct ftrace_event_call *call)
194 {
195         return call == &event_function;
196 }
197
198 #include "trace_entries.h"