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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 | ||
3dd80953 SRV |
17 | /* Stub function for events with triggers */ |
18 | static int ftrace_event_register(struct trace_event_call *call, | |
19 | enum trace_reg type, void *data) | |
20 | { | |
21 | return 0; | |
22 | } | |
23 | ||
4e5292ea SR |
24 | #undef TRACE_SYSTEM |
25 | #define TRACE_SYSTEM ftrace | |
da4d0302 | 26 | |
e59a0bff JO |
27 | /* |
28 | * The FTRACE_ENTRY_REG macro allows ftrace entry to define register | |
2b5894cc | 29 | * function and thus become accessible via perf. |
e59a0bff JO |
30 | */ |
31 | #undef FTRACE_ENTRY_REG | |
04ae87a5 PZ |
32 | #define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, regfn) \ |
33 | FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print)) | |
e59a0bff | 34 | |
4e5292ea SR |
35 | /* not needed for this file */ |
36 | #undef __field_struct | |
37 | #define __field_struct(type, item) | |
da4d0302 | 38 | |
05ffa2d0 LZ |
39 | #undef __field |
40 | #define __field(type, item) type item; | |
41 | ||
04ae87a5 PZ |
42 | #undef __field_fn |
43 | #define __field_fn(type, item) type item; | |
44 | ||
05ffa2d0 LZ |
45 | #undef __field_desc |
46 | #define __field_desc(type, container, item) type item; | |
47 | ||
4649079b SRV |
48 | #undef __field_packed |
49 | #define __field_packed(type, container, item) type item; | |
50 | ||
05ffa2d0 LZ |
51 | #undef __array |
52 | #define __array(type, item, size) type item[size]; | |
53 | ||
54 | #undef __array_desc | |
55 | #define __array_desc(type, container, item, size) type item[size]; | |
56 | ||
57 | #undef __dynamic_array | |
58 | #define __dynamic_array(type, item) type item[]; | |
59 | ||
60 | #undef F_STRUCT | |
61 | #define F_STRUCT(args...) args | |
62 | ||
63 | #undef F_printk | |
64 | #define F_printk(fmt, args...) fmt, args | |
65 | ||
66 | #undef FTRACE_ENTRY | |
04ae87a5 | 67 | #define FTRACE_ENTRY(name, struct_name, id, tstruct, print) \ |
02aa3162 JO |
68 | struct ____ftrace_##name { \ |
69 | tstruct \ | |
70 | }; \ | |
71 | static void __always_unused ____ftrace_check_##name(void) \ | |
72 | { \ | |
73 | struct ____ftrace_##name *__entry = NULL; \ | |
74 | \ | |
75 | /* force compile-time check on F_printk() */ \ | |
76 | printk(print); \ | |
05ffa2d0 LZ |
77 | } |
78 | ||
79 | #undef FTRACE_ENTRY_DUP | |
04ae87a5 PZ |
80 | #define FTRACE_ENTRY_DUP(name, struct_name, id, tstruct, print) \ |
81 | FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print)) | |
05ffa2d0 LZ |
82 | |
83 | #include "trace_entries.h" | |
84 | ||
04ae87a5 PZ |
85 | #undef __field_ext |
86 | #define __field_ext(_type, _item, _filter_type) { \ | |
87 | .type = #_type, .name = #_item, \ | |
88 | .size = sizeof(_type), .align = __alignof__(_type), \ | |
89 | is_signed_type(_type), .filter_type = _filter_type }, | |
90 | ||
4649079b SRV |
91 | |
92 | #undef __field_ext_packed | |
93 | #define __field_ext_packed(_type, _item, _filter_type) { \ | |
94 | .type = #_type, .name = #_item, \ | |
95 | .size = sizeof(_type), .align = 1, \ | |
96 | is_signed_type(_type), .filter_type = _filter_type }, | |
97 | ||
4e5292ea | 98 | #undef __field |
04ae87a5 PZ |
99 | #define __field(_type, _item) __field_ext(_type, _item, FILTER_OTHER) |
100 | ||
101 | #undef __field_fn | |
102 | #define __field_fn(_type, _item) __field_ext(_type, _item, FILTER_TRACE_FN) | |
4e5292ea SR |
103 | |
104 | #undef __field_desc | |
04ae87a5 | 105 | #define __field_desc(_type, _container, _item) __field_ext(_type, _item, FILTER_OTHER) |
4e5292ea | 106 | |
4649079b SRV |
107 | #undef __field_packed |
108 | #define __field_packed(_type, _container, _item) __field_ext_packed(_type, _item, FILTER_OTHER) | |
109 | ||
4e5292ea | 110 | #undef __array |
04ae87a5 PZ |
111 | #define __array(_type, _item, _len) { \ |
112 | .type = #_type"["__stringify(_len)"]", .name = #_item, \ | |
113 | .size = sizeof(_type[_len]), .align = __alignof__(_type), \ | |
114 | is_signed_type(_type), .filter_type = FILTER_OTHER }, | |
4e5292ea SR |
115 | |
116 | #undef __array_desc | |
04ae87a5 | 117 | #define __array_desc(_type, _container, _item, _len) __array(_type, _item, _len) |
4e5292ea SR |
118 | |
119 | #undef __dynamic_array | |
04ae87a5 PZ |
120 | #define __dynamic_array(_type, _item) { \ |
121 | .type = #_type "[]", .name = #_item, \ | |
122 | .size = 0, .align = __alignof__(_type), \ | |
123 | is_signed_type(_type), .filter_type = FILTER_OTHER }, | |
4e5292ea SR |
124 | |
125 | #undef FTRACE_ENTRY | |
04ae87a5 PZ |
126 | #define FTRACE_ENTRY(name, struct_name, id, tstruct, print) \ |
127 | static struct trace_event_fields ftrace_event_fields_##name[] = { \ | |
128 | tstruct \ | |
129 | {} }; | |
e45f2e2b | 130 | |
4e5292ea SR |
131 | #include "trace_entries.h" |
132 | ||
509e760c LJ |
133 | #undef __entry |
134 | #define __entry REC | |
135 | ||
4e5292ea SR |
136 | #undef __field |
137 | #define __field(type, item) | |
138 | ||
04ae87a5 PZ |
139 | #undef __field_fn |
140 | #define __field_fn(type, item) | |
141 | ||
4e5292ea SR |
142 | #undef __field_desc |
143 | #define __field_desc(type, container, item) | |
144 | ||
4649079b SRV |
145 | #undef __field_packed |
146 | #define __field_packed(type, container, item) | |
147 | ||
4e5292ea SR |
148 | #undef __array |
149 | #define __array(type, item, len) | |
150 | ||
151 | #undef __array_desc | |
152 | #define __array_desc(type, container, item, len) | |
153 | ||
154 | #undef __dynamic_array | |
155 | #define __dynamic_array(type, item) | |
156 | ||
509e760c | 157 | #undef F_printk |
01de982a | 158 | #define F_printk(fmt, args...) __stringify(fmt) ", " __stringify(args) |
509e760c | 159 | |
e59a0bff | 160 | #undef FTRACE_ENTRY_REG |
04ae87a5 | 161 | #define FTRACE_ENTRY_REG(call, struct_name, etype, tstruct, print, regfn) \ |
6dff4d7d | 162 | static struct trace_event_class __refdata event_class_ftrace_##call = { \ |
2e33af02 | 163 | .system = __stringify(TRACE_SYSTEM), \ |
04ae87a5 | 164 | .fields_array = ftrace_event_fields_##call, \ |
ffb9f995 | 165 | .fields = LIST_HEAD_INIT(event_class_ftrace_##call.fields),\ |
e59a0bff | 166 | .reg = regfn, \ |
2e33af02 SR |
167 | }; \ |
168 | \ | |
2425bcb9 | 169 | struct trace_event_call __used event_##call = { \ |
2e33af02 | 170 | .class = &event_class_ftrace_##call, \ |
abb43f69 MD |
171 | { \ |
172 | .name = #call, \ | |
173 | }, \ | |
174 | .event.type = etype, \ | |
509e760c | 175 | .print_fmt = print, \ |
754cb007 | 176 | .flags = TRACE_EVENT_FL_IGNORE_ENABLE, \ |
e1112b4d | 177 | }; \ |
6dff4d7d | 178 | static struct trace_event_call __used \ |
33def849 | 179 | __section("_ftrace_events") *__event_##call = &event_##call; |
e1112b4d | 180 | |
e59a0bff | 181 | #undef FTRACE_ENTRY |
04ae87a5 | 182 | #define FTRACE_ENTRY(call, struct_name, etype, tstruct, print) \ |
e59a0bff | 183 | FTRACE_ENTRY_REG(call, struct_name, etype, \ |
04ae87a5 | 184 | PARAMS(tstruct), PARAMS(print), NULL) |
e59a0bff | 185 | |
c6650b2e | 186 | bool ftrace_event_is_function(struct trace_event_call *call) |
ced39002 JO |
187 | { |
188 | return call == &event_function; | |
189 | } | |
190 | ||
4e5292ea | 191 | #include "trace_entries.h" |