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 BUILD_BUG_ON(len > MAX_FILTER_STR_VAL); \ 87 ret = trace_define_field(event_call, #type "[" #len "]", #item, \ 88 offsetof(typeof(field), item), \ 89 sizeof(field.item), \ 90 is_signed_type(type), FILTER_OTHER); \ 91 if (ret) \ 92 return ret; 93 94#undef __array_desc 95#define __array_desc(type, container, item, len) \ 96 BUILD_BUG_ON(len > MAX_FILTER_STR_VAL); \ 97 ret = trace_define_field(event_call, #type "[" #len "]", #item, \ 98 offsetof(typeof(field), \ 99 container.item), \ 100 sizeof(field.container.item), \ 101 is_signed_type(type), FILTER_OTHER); \ 102 if (ret) \ 103 return ret; 104 105#undef __dynamic_array 106#define __dynamic_array(type, item) \ 107 ret = trace_define_field(event_call, #type, #item, \ 108 offsetof(typeof(field), item), \ 109 0, is_signed_type(type), FILTER_OTHER);\ 110 if (ret) \ 111 return ret; 112 113#undef FTRACE_ENTRY 114#define FTRACE_ENTRY(name, struct_name, id, tstruct, print) \ 115int \ 116ftrace_define_fields_##name(struct ftrace_event_call *event_call) \ 117{ \ 118 struct struct_name field; \ 119 int ret; \ 120 \ 121 tstruct; \ 122 \ 123 return ret; \ 124} 125 126#include "trace_entries.h" 127 128#undef __entry 129#define __entry REC 130 131#undef __field 132#define __field(type, item) 133 134#undef __field_desc 135#define __field_desc(type, container, item) 136 137#undef __array 138#define __array(type, item, len) 139 140#undef __array_desc 141#define __array_desc(type, container, item, len) 142 143#undef __dynamic_array 144#define __dynamic_array(type, item) 145 146#undef F_printk 147#define F_printk(fmt, args...) #fmt ", " __stringify(args) 148 149#undef FTRACE_ENTRY 150#define FTRACE_ENTRY(call, struct_name, etype, tstruct, print) \ 151 \ 152struct ftrace_event_class event_class_ftrace_##call = { \ 153 .system = __stringify(TRACE_SYSTEM), \ 154 .define_fields = ftrace_define_fields_##call, \ 155 .fields = LIST_HEAD_INIT(event_class_ftrace_##call.fields),\ 156}; \ 157 \ 158struct ftrace_event_call __used \ 159__attribute__((__aligned__(4))) \ 160__attribute__((section("_ftrace_events"))) event_##call = { \ 161 .name = #call, \ 162 .event.type = etype, \ 163 .class = &event_class_ftrace_##call, \ 164 .print_fmt = print, \ 165}; \ 166 167#include "trace_entries.h" 168