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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
770cb243 SR |
2 | /* |
3 | * trace_export.c - export basic ftrace utilities to user space | |
4 | * | |
5 | * Copyright (C) 2009 Steven Rostedt <srostedt@redhat.com> | |
6 | */ | |
7 | #include <linux/stringify.h> | |
8 | #include <linux/kallsyms.h> | |
9 | #include <linux/seq_file.h> | |
770cb243 SR |
10 | #include <linux/uaccess.h> |
11 | #include <linux/ftrace.h> | |
12 | #include <linux/module.h> | |
13 | #include <linux/init.h> | |
770cb243 SR |
14 | |
15 | #include "trace_output.h" | |
16 | ||
4e5292ea SR |
17 | #undef TRACE_SYSTEM |
18 | #define TRACE_SYSTEM ftrace | |
da4d0302 | 19 | |
e59a0bff JO |
20 | /* |
21 | * The FTRACE_ENTRY_REG macro allows ftrace entry to define register | |
22 | * function and thus become accesible via perf. | |
23 | */ | |
24 | #undef FTRACE_ENTRY_REG | |
02aa3162 JO |
25 | #define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, \ |
26 | filter, regfn) \ | |
27 | FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \ | |
28 | filter) | |
e59a0bff | 29 | |
4e5292ea SR |
30 | /* not needed for this file */ |
31 | #undef __field_struct | |
32 | #define __field_struct(type, item) | |
da4d0302 | 33 | |
05ffa2d0 LZ |
34 | #undef __field |
35 | #define __field(type, item) type item; | |
36 | ||
37 | #undef __field_desc | |
38 | #define __field_desc(type, container, item) type item; | |
39 | ||
40 | #undef __array | |
41 | #define __array(type, item, size) type item[size]; | |
42 | ||
43 | #undef __array_desc | |
44 | #define __array_desc(type, container, item, size) type item[size]; | |
45 | ||
46 | #undef __dynamic_array | |
47 | #define __dynamic_array(type, item) type item[]; | |
48 | ||
49 | #undef F_STRUCT | |
50 | #define F_STRUCT(args...) args | |
51 | ||
52 | #undef F_printk | |
53 | #define F_printk(fmt, args...) fmt, args | |
54 | ||
55 | #undef FTRACE_ENTRY | |
02aa3162 JO |
56 | #define FTRACE_ENTRY(name, struct_name, id, tstruct, print, filter) \ |
57 | struct ____ftrace_##name { \ | |
58 | tstruct \ | |
59 | }; \ | |
60 | static void __always_unused ____ftrace_check_##name(void) \ | |
61 | { \ | |
62 | struct ____ftrace_##name *__entry = NULL; \ | |
63 | \ | |
64 | /* force compile-time check on F_printk() */ \ | |
65 | printk(print); \ | |
05ffa2d0 LZ |
66 | } |
67 | ||
68 | #undef FTRACE_ENTRY_DUP | |
02aa3162 JO |
69 | #define FTRACE_ENTRY_DUP(name, struct_name, id, tstruct, print, filter) \ |
70 | FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \ | |
71 | filter) | |
05ffa2d0 LZ |
72 | |
73 | #include "trace_entries.h" | |
74 | ||
4e5292ea SR |
75 | #undef __field |
76 | #define __field(type, item) \ | |
77 | ret = trace_define_field(event_call, #type, #item, \ | |
78 | offsetof(typeof(field), item), \ | |
79 | sizeof(field.item), \ | |
02aa3162 | 80 | is_signed_type(type), filter_type); \ |
4e5292ea SR |
81 | if (ret) \ |
82 | return ret; | |
83 | ||
84 | #undef __field_desc | |
85 | #define __field_desc(type, container, item) \ | |
86 | ret = trace_define_field(event_call, #type, #item, \ | |
87 | offsetof(typeof(field), \ | |
88 | container.item), \ | |
89 | sizeof(field.container.item), \ | |
02aa3162 | 90 | is_signed_type(type), filter_type); \ |
4e5292ea SR |
91 | if (ret) \ |
92 | return ret; | |
93 | ||
94 | #undef __array | |
95 | #define __array(type, item, len) \ | |
04295780 | 96 | do { \ |
87291347 | 97 | char *type_str = #type"["__stringify(len)"]"; \ |
04295780 | 98 | BUILD_BUG_ON(len > MAX_FILTER_STR_VAL); \ |
87291347 | 99 | ret = trace_define_field(event_call, type_str, #item, \ |
4e5292ea | 100 | offsetof(typeof(field), item), \ |
fb7ae981 | 101 | sizeof(field.item), \ |
02aa3162 | 102 | is_signed_type(type), filter_type); \ |
04295780 SR |
103 | if (ret) \ |
104 | return ret; \ | |
105 | } while (0); | |
4e5292ea SR |
106 | |
107 | #undef __array_desc | |
108 | #define __array_desc(type, container, item, len) \ | |
109 | BUILD_BUG_ON(len > MAX_FILTER_STR_VAL); \ | |
110 | ret = trace_define_field(event_call, #type "[" #len "]", #item, \ | |
111 | offsetof(typeof(field), \ | |
112 | container.item), \ | |
fb7ae981 | 113 | sizeof(field.container.item), \ |
02aa3162 | 114 | is_signed_type(type), filter_type); \ |
4e5292ea SR |
115 | if (ret) \ |
116 | return ret; | |
117 | ||
118 | #undef __dynamic_array | |
809826a3 LJ |
119 | #define __dynamic_array(type, item) \ |
120 | ret = trace_define_field(event_call, #type, #item, \ | |
121 | offsetof(typeof(field), item), \ | |
02aa3162 | 122 | 0, is_signed_type(type), filter_type);\ |
809826a3 LJ |
123 | if (ret) \ |
124 | return ret; | |
4e5292ea SR |
125 | |
126 | #undef FTRACE_ENTRY | |
02aa3162 | 127 | #define FTRACE_ENTRY(name, struct_name, id, tstruct, print, filter) \ |
7e4f44b1 | 128 | static int __init \ |
2425bcb9 | 129 | ftrace_define_fields_##name(struct trace_event_call *event_call) \ |
e45f2e2b | 130 | { \ |
4e5292ea | 131 | struct struct_name field; \ |
e45f2e2b | 132 | int ret; \ |
02aa3162 | 133 | int filter_type = filter; \ |
e45f2e2b | 134 | \ |
4e5292ea | 135 | tstruct; \ |
e45f2e2b TZ |
136 | \ |
137 | return ret; \ | |
138 | } | |
139 | ||
4e5292ea SR |
140 | #include "trace_entries.h" |
141 | ||
509e760c LJ |
142 | #undef __entry |
143 | #define __entry REC | |
144 | ||
4e5292ea SR |
145 | #undef __field |
146 | #define __field(type, item) | |
147 | ||
148 | #undef __field_desc | |
149 | #define __field_desc(type, container, item) | |
150 | ||
151 | #undef __array | |
152 | #define __array(type, item, len) | |
153 | ||
154 | #undef __array_desc | |
155 | #define __array_desc(type, container, item, len) | |
156 | ||
157 | #undef __dynamic_array | |
158 | #define __dynamic_array(type, item) | |
159 | ||
509e760c | 160 | #undef F_printk |
01de982a | 161 | #define F_printk(fmt, args...) __stringify(fmt) ", " __stringify(args) |
509e760c | 162 | |
e59a0bff | 163 | #undef FTRACE_ENTRY_REG |
02aa3162 JO |
164 | #define FTRACE_ENTRY_REG(call, struct_name, etype, tstruct, print, filter,\ |
165 | regfn) \ | |
770cb243 | 166 | \ |
2425bcb9 | 167 | struct trace_event_class __refdata event_class_ftrace_##call = { \ |
2e33af02 SR |
168 | .system = __stringify(TRACE_SYSTEM), \ |
169 | .define_fields = ftrace_define_fields_##call, \ | |
ffb9f995 | 170 | .fields = LIST_HEAD_INIT(event_class_ftrace_##call.fields),\ |
e59a0bff | 171 | .reg = regfn, \ |
2e33af02 SR |
172 | }; \ |
173 | \ | |
2425bcb9 | 174 | struct trace_event_call __used event_##call = { \ |
2e33af02 | 175 | .class = &event_class_ftrace_##call, \ |
abb43f69 MD |
176 | { \ |
177 | .name = #call, \ | |
178 | }, \ | |
179 | .event.type = etype, \ | |
509e760c | 180 | .print_fmt = print, \ |
754cb007 | 181 | .flags = TRACE_EVENT_FL_IGNORE_ENABLE, \ |
e1112b4d | 182 | }; \ |
2425bcb9 | 183 | struct trace_event_call __used \ |
e4a9ea5e | 184 | __attribute__((section("_ftrace_events"))) *__event_##call = &event_##call; |
e1112b4d | 185 | |
e59a0bff | 186 | #undef FTRACE_ENTRY |
02aa3162 | 187 | #define FTRACE_ENTRY(call, struct_name, etype, tstruct, print, filter) \ |
e59a0bff | 188 | FTRACE_ENTRY_REG(call, struct_name, etype, \ |
02aa3162 | 189 | PARAMS(tstruct), PARAMS(print), filter, NULL) |
e59a0bff | 190 | |
c6650b2e | 191 | bool ftrace_event_is_function(struct trace_event_call *call) |
ced39002 JO |
192 | { |
193 | return call == &event_function; | |
194 | } | |
195 | ||
4e5292ea | 196 | #include "trace_entries.h" |