2 * trace_export.c - export basic ftrace utilities to user space
4 * Copyright (C) 2009 Steven Rostedt <srostedt@redhat.com>
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>
16 #include "trace_output.h"
19 #define TRACE_SYSTEM ftrace
22 * The FTRACE_ENTRY_REG macro allows ftrace entry to define register
23 * function and thus become accesible via perf.
25 #undef FTRACE_ENTRY_REG
26 #define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, \
28 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \
31 /* not needed for this file */
33 #define __field_struct(type, item)
36 #define __field(type, item) type item;
39 #define __field_desc(type, container, item) type item;
42 #define __array(type, item, size) type item[size];
45 #define __array_desc(type, container, item, size) type item[size];
47 #undef __dynamic_array
48 #define __dynamic_array(type, item) type item[];
51 #define F_STRUCT(args...) args
54 #define F_printk(fmt, args...) fmt, args
57 #define FTRACE_ENTRY(name, struct_name, id, tstruct, print, filter) \
58 struct ____ftrace_##name { \
61 static void __always_unused ____ftrace_check_##name(void) \
63 struct ____ftrace_##name *__entry = NULL; \
65 /* force compile-time check on F_printk() */ \
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), \
74 #include "trace_entries.h"
77 #define __field(type, item) \
78 ret = trace_define_field(event_call, #type, #item, \
79 offsetof(typeof(field), item), \
81 is_signed_type(type), filter_type); \
86 #define __field_desc(type, container, item) \
87 ret = trace_define_field(event_call, #type, #item, \
88 offsetof(typeof(field), \
90 sizeof(field.container.item), \
91 is_signed_type(type), filter_type); \
96 #define __array(type, item, len) \
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); \
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), \
117 sizeof(field.container.item), \
118 is_signed_type(type), filter_type); \
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);\
131 #define FTRACE_ENTRY(name, struct_name, id, tstruct, print, filter) \
133 ftrace_define_fields_##name(struct ftrace_event_call *event_call) \
135 struct struct_name field; \
137 int filter_type = filter; \
144 #include "trace_entries.h"
150 #define __field(type, item)
153 #define __field_desc(type, container, item)
156 #define __array(type, item, len)
159 #define __array_desc(type, container, item, len)
161 #undef __dynamic_array
162 #define __dynamic_array(type, item)
165 #define F_printk(fmt, args...) __stringify(fmt) ", " __stringify(args)
167 #undef FTRACE_ENTRY_REG
168 #define FTRACE_ENTRY_REG(call, struct_name, etype, tstruct, print, filter,\
171 struct 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),\
178 struct ftrace_event_call __used event_##call = { \
180 .event.type = etype, \
181 .class = &event_class_ftrace_##call, \
182 .print_fmt = print, \
183 .flags = TRACE_EVENT_FL_IGNORE_ENABLE, \
185 struct ftrace_event_call __used \
186 __attribute__((section("_ftrace_events"))) *__event_##call = &event_##call;
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)
193 int ftrace_event_is_function(struct ftrace_event_call
*call
)
195 return call
== &event_function
;
198 #include "trace_entries.h"
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