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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/* Stub function for events with triggers */
18static int ftrace_event_register(struct trace_event_call *call,
19 enum trace_reg type, void *data)
20{
21 return 0;
22}
23
24#undef TRACE_SYSTEM
25#define TRACE_SYSTEM ftrace
26
27/*
28 * The FTRACE_ENTRY_REG macro allows ftrace entry to define register
29 * function and thus become accessible via perf.
30 */
31#undef FTRACE_ENTRY_REG
32#define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, regfn) \
33 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print))
34
35/* not needed for this file */
36#undef __field_struct
37#define __field_struct(type, item)
38
39#undef __field
40#define __field(type, item) type item;
41
42#undef __field_fn
43#define __field_fn(type, item) type item;
44
45#undef __field_desc
46#define __field_desc(type, container, item) type item;
47
48#undef __field_packed
49#define __field_packed(type, container, item) type item;
50
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
67#define FTRACE_ENTRY(name, struct_name, id, tstruct, print) \
68struct ____ftrace_##name { \
69 tstruct \
70}; \
71static 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); \
77}
78
79#undef FTRACE_ENTRY_DUP
80#define FTRACE_ENTRY_DUP(name, struct_name, id, tstruct, print) \
81 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print))
82
83#include "trace_entries.h"
84
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
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
98#undef __field
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)
103
104#undef __field_desc
105#define __field_desc(_type, _container, _item) __field_ext(_type, _item, FILTER_OTHER)
106
107#undef __field_packed
108#define __field_packed(_type, _container, _item) __field_ext_packed(_type, _item, FILTER_OTHER)
109
110#undef __array
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, \
115 .len = _len },
116
117#undef __array_desc
118#define __array_desc(_type, _container, _item, _len) __array(_type, _item, _len)
119
120#undef __dynamic_array
121#define __dynamic_array(_type, _item) { \
122 .type = #_type "[]", .name = #_item, \
123 .size = 0, .align = __alignof__(_type), \
124 is_signed_type(_type), .filter_type = FILTER_OTHER },
125
126#undef FTRACE_ENTRY
127#define FTRACE_ENTRY(name, struct_name, id, tstruct, print) \
128static struct trace_event_fields ftrace_event_fields_##name[] = { \
129 tstruct \
130 {} };
131
132#include "__KEEPIDENTS__BCG.h"
133
134#undef __entry
135#define __entry REC
136
137#undef __field
138#define __field(type, item)
139
140#undef __field_fn
141#define __field_fn(type, item)
142
143#undef __field_desc
144#define __field_desc(type, container, item)
145
146#undef __field_packed
147#define __field_packed(type, container, item)
148
149#undef __array
150#define __array(type, item, len)
151
152#undef __array_desc
153#define __array_desc(type, container, item, len)
154
155#undef __dynamic_array
156#define __dynamic_array(type, item)
157
158#undef F_printk
159#define F_printk(fmt, args...) __stringify(fmt) ", " __stringify(args)
160
161#undef FTRACE_ENTRY_REG
162#define FTRACE_ENTRY_REG(call, struct_name, etype, tstruct, print, regfn) \
163static struct trace_event_class __refdata event_class_ftrace_##call = { \
164 .system = __stringify(TRACE_SYSTEM), \
165 .fields_array = ftrace_event_fields_##call, \
166 .fields = LIST_HEAD_INIT(event_class_ftrace_##call.fields),\
167 .reg = regfn, \
168}; \
169 \
170struct trace_event_call __used event_##call = { \
171 .class = &event_class_ftrace_##call, \
172 { \
173 .name = #call, \
174 }, \
175 .event.type = etype, \
176 .print_fmt = print, \
177 .flags = TRACE_EVENT_FL_IGNORE_ENABLE, \
178}; \
179static struct trace_event_call __used \
180__section("_ftrace_events") *__event_##call = &event_##call;
181
182#undef FTRACE_ENTRY
183#define FTRACE_ENTRY(call, struct_name, etype, tstruct, print) \
184 FTRACE_ENTRY_REG(call, struct_name, etype, \
185 PARAMS(tstruct), PARAMS(print), NULL)
186
187bool ftrace_event_is_function(struct trace_event_call *call)
188{
189 return call == &event_function;
190}
191
192#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/*
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
26#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)
30
31/* not needed for this file */
32#undef __field_struct
33#define __field_struct(type, item)
34
35#undef __field
36#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
57#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); \
67}
68
69#undef FTRACE_ENTRY_DUP
70#define FTRACE_ENTRY_DUP(name, struct_name, id, tstruct, print, filter) \
71 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \
72 filter)
73
74#include "trace_entries.h"
75
76#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), \
81 is_signed_type(type), filter_type); \
82 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), \
91 is_signed_type(type), filter_type); \
92 if (ret) \
93 return ret;
94
95#undef __array
96#define __array(type, item, len) \
97 do { \
98 BUILD_BUG_ON(len > MAX_FILTER_STR_VAL); \
99 mutex_lock(&event_storage_mutex); \
100 snprintf(event_storage, sizeof(event_storage), \
101 "%s[%d]", #type, len); \
102 ret = trace_define_field(event_call, event_storage, #item, \
103 offsetof(typeof(field), item), \
104 sizeof(field.item), \
105 is_signed_type(type), filter_type); \
106 mutex_unlock(&event_storage_mutex); \
107 if (ret) \
108 return ret; \
109 } while (0);
110
111#undef __array_desc
112#define __array_desc(type, container, item, len) \
113 BUILD_BUG_ON(len > MAX_FILTER_STR_VAL); \
114 ret = trace_define_field(event_call, #type "[" #len "]", #item, \
115 offsetof(typeof(field), \
116 container.item), \
117 sizeof(field.container.item), \
118 is_signed_type(type), filter_type); \
119 if (ret) \
120 return ret;
121
122#undef __dynamic_array
123#define __dynamic_array(type, item) \
124 ret = trace_define_field(event_call, #type, #item, \
125 offsetof(typeof(field), item), \
126 0, is_signed_type(type), filter_type);\
127 if (ret) \
128 return ret;
129
130#undef FTRACE_ENTRY
131#define FTRACE_ENTRY(name, struct_name, id, tstruct, print, filter) \
132int \
133ftrace_define_fields_##name(struct ftrace_event_call *event_call) \
134{ \
135 struct struct_name field; \
136 int ret; \
137 int filter_type = filter; \
138 \
139 tstruct; \
140 \
141 return ret; \
142}
143
144#include "trace_entries.h"
145
146#undef __entry
147#define __entry REC
148
149#undef __field
150#define __field(type, item)
151
152#undef __field_desc
153#define __field_desc(type, container, item)
154
155#undef __array
156#define __array(type, item, len)
157
158#undef __array_desc
159#define __array_desc(type, container, item, len)
160
161#undef __dynamic_array
162#define __dynamic_array(type, item)
163
164#undef F_printk
165#define F_printk(fmt, args...) __stringify(fmt) ", " __stringify(args)
166
167#undef FTRACE_ENTRY_REG
168#define FTRACE_ENTRY_REG(call, struct_name, etype, tstruct, print, filter,\
169 regfn) \
170 \
171struct ftrace_event_class event_class_ftrace_##call = { \
172 .system = __stringify(TRACE_SYSTEM), \
173 .define_fields = ftrace_define_fields_##call, \
174 .fields = LIST_HEAD_INIT(event_class_ftrace_##call.fields),\
175 .reg = regfn, \
176}; \
177 \
178struct ftrace_event_call __used event_##call = { \
179 .name = #call, \
180 .event.type = etype, \
181 .class = &event_class_ftrace_##call, \
182 .print_fmt = print, \
183 .flags = TRACE_EVENT_FL_IGNORE_ENABLE, \
184}; \
185struct ftrace_event_call __used \
186__attribute__((section("_ftrace_events"))) *__event_##call = &event_##call;
187
188#undef FTRACE_ENTRY
189#define FTRACE_ENTRY(call, struct_name, etype, tstruct, print, filter) \
190 FTRACE_ENTRY_REG(call, struct_name, etype, \
191 PARAMS(tstruct), PARAMS(print), filter, NULL)
192
193int ftrace_event_is_function(struct ftrace_event_call *call)
194{
195 return call == &event_function;
196}
197
198#include "trace_entries.h"