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1// SPDX-License-Identifier: GPL-2.0
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>
10#include <linux/uaccess.h>
11#include <linux/ftrace.h>
12#include <linux/module.h>
13#include <linux/init.h>
14
15#include "trace_output.h"
16
17#undef TRACE_SYSTEM
18#define TRACE_SYSTEM ftrace
19
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
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)
29
30/* not needed for this file */
31#undef __field_struct
32#define __field_struct(type, item)
33
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
56#define FTRACE_ENTRY(name, struct_name, id, tstruct, print, filter) \
57struct ____ftrace_##name { \
58 tstruct \
59}; \
60static 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); \
66}
67
68#undef FTRACE_ENTRY_DUP
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)
72
73#include "trace_entries.h"
74
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), \
80 is_signed_type(type), filter_type); \
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), \
90 is_signed_type(type), filter_type); \
91 if (ret) \
92 return ret;
93
94#undef __array
95#define __array(type, item, len) \
96 do { \
97 char *type_str = #type"["__stringify(len)"]"; \
98 BUILD_BUG_ON(len > MAX_FILTER_STR_VAL); \
99 ret = trace_define_field(event_call, type_str, #item, \
100 offsetof(typeof(field), item), \
101 sizeof(field.item), \
102 is_signed_type(type), filter_type); \
103 if (ret) \
104 return ret; \
105 } while (0);
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), \
113 sizeof(field.container.item), \
114 is_signed_type(type), filter_type); \
115 if (ret) \
116 return ret;
117
118#undef __dynamic_array
119#define __dynamic_array(type, item) \
120 ret = trace_define_field(event_call, #type, #item, \
121 offsetof(typeof(field), item), \
122 0, is_signed_type(type), filter_type);\
123 if (ret) \
124 return ret;
125
126#undef FTRACE_ENTRY
127#define FTRACE_ENTRY(name, struct_name, id, tstruct, print, filter) \
128static int __init \
129ftrace_define_fields_##name(struct trace_event_call *event_call) \
130{ \
131 struct struct_name field; \
132 int ret; \
133 int filter_type = filter; \
134 \
135 tstruct; \
136 \
137 return ret; \
138}
139
140#include "__KEEPIDENTS__BAF.h"
141
142#undef __entry
143#define __entry REC
144
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
160#undef F_printk
161#define F_printk(fmt, args...) __stringify(fmt) ", " __stringify(args)
162
163#undef FTRACE_ENTRY_REG
164#define FTRACE_ENTRY_REG(call, struct_name, etype, tstruct, print, filter,\
165 regfn) \
166 \
167struct trace_event_class __refdata event_class_ftrace_##call = { \
168 .system = __stringify(TRACE_SYSTEM), \
169 .define_fields = ftrace_define_fields_##call, \
170 .fields = LIST_HEAD_INIT(event_class_ftrace_##call.fields),\
171 .reg = regfn, \
172}; \
173 \
174struct trace_event_call __used event_##call = { \
175 .class = &event_class_ftrace_##call, \
176 { \
177 .name = #call, \
178 }, \
179 .event.type = etype, \
180 .print_fmt = print, \
181 .flags = TRACE_EVENT_FL_IGNORE_ENABLE, \
182}; \
183struct trace_event_call __used \
184__attribute__((section("_ftrace_events"))) *__event_##call = &event_##call;
185
186#undef FTRACE_ENTRY
187#define FTRACE_ENTRY(call, struct_name, etype, tstruct, print, filter) \
188 FTRACE_ENTRY_REG(call, struct_name, etype, \
189 PARAMS(tstruct), PARAMS(print), filter, NULL)
190
191bool ftrace_event_is_function(struct trace_event_call *call)
192{
193 return call == &event_function;
194}
195
196#include "trace_entries.h"
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) \
48struct ____ftrace_##name { \
49 tstruct \
50}; \
51static 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 do { \
87 BUILD_BUG_ON(len > MAX_FILTER_STR_VAL); \
88 mutex_lock(&event_storage_mutex); \
89 snprintf(event_storage, sizeof(event_storage), \
90 "%s[%d]", #type, len); \
91 ret = trace_define_field(event_call, event_storage, #item, \
92 offsetof(typeof(field), item), \
93 sizeof(field.item), \
94 is_signed_type(type), FILTER_OTHER); \
95 mutex_unlock(&event_storage_mutex); \
96 if (ret) \
97 return ret; \
98 } while (0);
99
100#undef __array_desc
101#define __array_desc(type, container, item, len) \
102 BUILD_BUG_ON(len > MAX_FILTER_STR_VAL); \
103 ret = trace_define_field(event_call, #type "[" #len "]", #item, \
104 offsetof(typeof(field), \
105 container.item), \
106 sizeof(field.container.item), \
107 is_signed_type(type), FILTER_OTHER); \
108 if (ret) \
109 return ret;
110
111#undef __dynamic_array
112#define __dynamic_array(type, item) \
113 ret = trace_define_field(event_call, #type, #item, \
114 offsetof(typeof(field), item), \
115 0, is_signed_type(type), FILTER_OTHER);\
116 if (ret) \
117 return ret;
118
119#undef FTRACE_ENTRY
120#define FTRACE_ENTRY(name, struct_name, id, tstruct, print) \
121int \
122ftrace_define_fields_##name(struct ftrace_event_call *event_call) \
123{ \
124 struct struct_name field; \
125 int ret; \
126 \
127 tstruct; \
128 \
129 return ret; \
130}
131
132#include "trace_entries.h"
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, etype, tstruct, print) \
157 \
158struct ftrace_event_class event_class_ftrace_##call = { \
159 .system = __stringify(TRACE_SYSTEM), \
160 .define_fields = ftrace_define_fields_##call, \
161 .fields = LIST_HEAD_INIT(event_class_ftrace_##call.fields),\
162}; \
163 \
164struct ftrace_event_call __used event_##call = { \
165 .name = #call, \
166 .event.type = etype, \
167 .class = &event_class_ftrace_##call, \
168 .print_fmt = print, \
169}; \
170struct ftrace_event_call __used \
171__attribute__((section("_ftrace_events"))) *__event_##call = &event_##call;
172
173#include "trace_entries.h"