ring-buffer: Make benchmark handle missed events
[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 /* 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 __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         BUILD_BUG_ON(len > MAX_FILTER_STR_VAL);                         \
87         ret = trace_define_field(event_call, #type "[" #len "]", #item, \
88                                  offsetof(typeof(field), item),         \
89                                  sizeof(field.item),                    \
90                                  is_signed_type(type), FILTER_OTHER);   \
91         if (ret)                                                        \
92                 return ret;
93
94 #undef __array_desc
95 #define __array_desc(type, container, item, len)                        \
96         BUILD_BUG_ON(len > MAX_FILTER_STR_VAL);                         \
97         ret = trace_define_field(event_call, #type "[" #len "]", #item, \
98                                  offsetof(typeof(field),                \
99                                           container.item),              \
100                                  sizeof(field.container.item),          \
101                                  is_signed_type(type), FILTER_OTHER);   \
102         if (ret)                                                        \
103                 return ret;
104
105 #undef __dynamic_array
106 #define __dynamic_array(type, item)                                     \
107         ret = trace_define_field(event_call, #type, #item,              \
108                                  offsetof(typeof(field), item),         \
109                                  0, is_signed_type(type), FILTER_OTHER);\
110         if (ret)                                                        \
111                 return ret;
112
113 #undef FTRACE_ENTRY
114 #define FTRACE_ENTRY(name, struct_name, id, tstruct, print)             \
115 int                                                                     \
116 ftrace_define_fields_##name(struct ftrace_event_call *event_call)       \
117 {                                                                       \
118         struct struct_name field;                                       \
119         int ret;                                                        \
120                                                                         \
121         tstruct;                                                        \
122                                                                         \
123         return ret;                                                     \
124 }
125
126 #include "trace_entries.h"
127
128 static int ftrace_raw_init_event(struct ftrace_event_call *call)
129 {
130         INIT_LIST_HEAD(&call->fields);
131         return 0;
132 }
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, type, tstruct, print)           \
157                                                                         \
158 struct ftrace_event_call __used                                         \
159 __attribute__((__aligned__(4)))                                         \
160 __attribute__((section("_ftrace_events"))) event_##call = {             \
161         .name                   = #call,                                \
162         .id                     = type,                                 \
163         .system                 = __stringify(TRACE_SYSTEM),            \
164         .raw_init               = ftrace_raw_init_event,                \
165         .print_fmt              = print,                                \
166         .define_fields          = ftrace_define_fields_##call,          \
167 };                                                                      \
168
169 #include "trace_entries.h"