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Steven Rostedt770cb242009-03-05 21:35:29 -05001/*
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
Steven Rostedt4e5292e2009-09-12 19:26:21 -040018#undef TRACE_SYSTEM
19#define TRACE_SYSTEM ftrace
Steven Rostedtda4d0302009-03-09 17:14:30 -040020
Jiri Olsae59a0bf2012-02-15 15:51:51 +010021/*
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
Jiri Olsa02aa3162012-02-15 15:51:53 +010026#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)
Jiri Olsae59a0bf2012-02-15 15:51:51 +010030
Steven Rostedt4e5292e2009-09-12 19:26:21 -040031/* not needed for this file */
32#undef __field_struct
33#define __field_struct(type, item)
Steven Rostedtda4d0302009-03-09 17:14:30 -040034
Steven Rostedt4e5292e2009-09-12 19:26:21 -040035#undef __field
Li Zefan05ffa2d2009-09-14 15:54:52 +080036#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
Jiri Olsa02aa3162012-02-15 15:51:53 +010057#define FTRACE_ENTRY(name, struct_name, id, tstruct, print, filter) \
58struct ____ftrace_##name { \
59 tstruct \
60}; \
61static 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); \
Li Zefan05ffa2d2009-09-14 15:54:52 +080067}
68
69#undef FTRACE_ENTRY_DUP
Jiri Olsa02aa3162012-02-15 15:51:53 +010070#define FTRACE_ENTRY_DUP(name, struct_name, id, tstruct, print, filter) \
71 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \
72 filter)
Li Zefan05ffa2d2009-09-14 15:54:52 +080073
74#include "trace_entries.h"
75
Steven Rostedt4e5292e2009-09-12 19:26:21 -040076#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), \
Jiri Olsa02aa3162012-02-15 15:51:53 +010081 is_signed_type(type), filter_type); \
Steven Rostedt4e5292e2009-09-12 19:26:21 -040082 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), \
Jiri Olsa02aa3162012-02-15 15:51:53 +010091 is_signed_type(type), filter_type); \
Steven Rostedt4e5292e2009-09-12 19:26:21 -040092 if (ret) \
93 return ret;
94
95#undef __array
96#define __array(type, item, len) \
Steven Rostedt04295782010-11-12 22:32:11 -050097 do { \
Vaibhav Nagarnaik87291342014-02-13 19:51:48 -080098 char *type_str = #type"["__stringify(len)"]"; \
Steven Rostedt04295782010-11-12 22:32:11 -050099 BUILD_BUG_ON(len > MAX_FILTER_STR_VAL); \
Vaibhav Nagarnaik87291342014-02-13 19:51:48 -0800100 ret = trace_define_field(event_call, type_str, #item, \
Steven Rostedt4e5292e2009-09-12 19:26:21 -0400101 offsetof(typeof(field), item), \
Lai Jiangshanfb7ae982009-12-15 15:39:38 +0800102 sizeof(field.item), \
Jiri Olsa02aa3162012-02-15 15:51:53 +0100103 is_signed_type(type), filter_type); \
Steven Rostedt04295782010-11-12 22:32:11 -0500104 if (ret) \
105 return ret; \
106 } while (0);
Steven Rostedt4e5292e2009-09-12 19:26:21 -0400107
108#undef __array_desc
109#define __array_desc(type, container, item, len) \
110 BUILD_BUG_ON(len > MAX_FILTER_STR_VAL); \
111 ret = trace_define_field(event_call, #type "[" #len "]", #item, \
112 offsetof(typeof(field), \
113 container.item), \
Lai Jiangshanfb7ae982009-12-15 15:39:38 +0800114 sizeof(field.container.item), \
Jiri Olsa02aa3162012-02-15 15:51:53 +0100115 is_signed_type(type), filter_type); \
Steven Rostedt4e5292e2009-09-12 19:26:21 -0400116 if (ret) \
117 return ret;
118
119#undef __dynamic_array
Lai Jiangshan809826a2009-12-15 15:39:34 +0800120#define __dynamic_array(type, item) \
121 ret = trace_define_field(event_call, #type, #item, \
122 offsetof(typeof(field), item), \
Jiri Olsa02aa3162012-02-15 15:51:53 +0100123 0, is_signed_type(type), filter_type);\
Lai Jiangshan809826a2009-12-15 15:39:34 +0800124 if (ret) \
125 return ret;
Steven Rostedt4e5292e2009-09-12 19:26:21 -0400126
127#undef FTRACE_ENTRY
Jiri Olsa02aa3162012-02-15 15:51:53 +0100128#define FTRACE_ENTRY(name, struct_name, id, tstruct, print, filter) \
Li Zefan7e4f44b2013-02-21 10:33:33 +0800129static int __init \
Steven Rostedt4e5292e2009-09-12 19:26:21 -0400130ftrace_define_fields_##name(struct ftrace_event_call *event_call) \
Tom Zanussie45f2e22009-03-31 00:49:16 -0500131{ \
Steven Rostedt4e5292e2009-09-12 19:26:21 -0400132 struct struct_name field; \
Tom Zanussie45f2e22009-03-31 00:49:16 -0500133 int ret; \
Jiri Olsa02aa3162012-02-15 15:51:53 +0100134 int filter_type = filter; \
Tom Zanussie45f2e22009-03-31 00:49:16 -0500135 \
Steven Rostedt4e5292e2009-09-12 19:26:21 -0400136 tstruct; \
Tom Zanussie45f2e22009-03-31 00:49:16 -0500137 \
138 return ret; \
139}
140
Steven Rostedt4e5292e2009-09-12 19:26:21 -0400141#include "trace_entries.h"
142
Lai Jiangshan509e7602009-12-15 15:39:42 +0800143#undef __entry
144#define __entry REC
145
Steven Rostedt4e5292e2009-09-12 19:26:21 -0400146#undef __field
147#define __field(type, item)
148
149#undef __field_desc
150#define __field_desc(type, container, item)
151
152#undef __array
153#define __array(type, item, len)
154
155#undef __array_desc
156#define __array_desc(type, container, item, len)
157
158#undef __dynamic_array
159#define __dynamic_array(type, item)
160
Lai Jiangshan509e7602009-12-15 15:39:42 +0800161#undef F_printk
Wolfgang Mauerer01de9822012-03-22 11:18:20 +0100162#define F_printk(fmt, args...) __stringify(fmt) ", " __stringify(args)
Lai Jiangshan509e7602009-12-15 15:39:42 +0800163
Jiri Olsae59a0bf2012-02-15 15:51:51 +0100164#undef FTRACE_ENTRY_REG
Jiri Olsa02aa3162012-02-15 15:51:53 +0100165#define FTRACE_ENTRY_REG(call, struct_name, etype, tstruct, print, filter,\
166 regfn) \
Steven Rostedt770cb242009-03-05 21:35:29 -0500167 \
Li Zefan523c8112013-03-04 14:15:59 +0800168struct ftrace_event_class __refdata event_class_ftrace_##call = { \
Steven Rostedt2e33af02010-04-22 10:35:55 -0400169 .system = __stringify(TRACE_SYSTEM), \
170 .define_fields = ftrace_define_fields_##call, \
Li Zefanffb9f992010-05-24 16:24:52 +0800171 .fields = LIST_HEAD_INIT(event_class_ftrace_##call.fields),\
Jiri Olsae59a0bf2012-02-15 15:51:51 +0100172 .reg = regfn, \
Steven Rostedt2e33af02010-04-22 10:35:55 -0400173}; \
174 \
Steven Rostedte4a9ea52011-01-27 09:15:30 -0500175struct ftrace_event_call __used event_##call = { \
Steven Rostedt2e33af02010-04-22 10:35:55 -0400176 .class = &event_class_ftrace_##call, \
Mathieu Desnoyersabb43f62014-04-09 17:06:08 -0400177 { \
178 .name = #call, \
179 }, \
180 .event.type = etype, \
Lai Jiangshan509e7602009-12-15 15:39:42 +0800181 .print_fmt = print, \
Tom Zanussif306cc82013-10-24 08:34:17 -0500182 .flags = TRACE_EVENT_FL_IGNORE_ENABLE | TRACE_EVENT_FL_USE_CALL_FILTER, \
Tom Zanussie1112b42009-03-31 00:48:49 -0500183}; \
Steven Rostedte4a9ea52011-01-27 09:15:30 -0500184struct ftrace_event_call __used \
185__attribute__((section("_ftrace_events"))) *__event_##call = &event_##call;
Tom Zanussie1112b42009-03-31 00:48:49 -0500186
Jiri Olsae59a0bf2012-02-15 15:51:51 +0100187#undef FTRACE_ENTRY
Jiri Olsa02aa3162012-02-15 15:51:53 +0100188#define FTRACE_ENTRY(call, struct_name, etype, tstruct, print, filter) \
Jiri Olsae59a0bf2012-02-15 15:51:51 +0100189 FTRACE_ENTRY_REG(call, struct_name, etype, \
Jiri Olsa02aa3162012-02-15 15:51:53 +0100190 PARAMS(tstruct), PARAMS(print), filter, NULL)
Jiri Olsae59a0bf2012-02-15 15:51:51 +0100191
Jiri Olsaced39002012-02-15 15:51:52 +0100192int ftrace_event_is_function(struct ftrace_event_call *call)
193{
194 return call == &event_function;
195}
196
Steven Rostedt4e5292e2009-09-12 19:26:21 -0400197#include "trace_entries.h"