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/uaccess.h> 10#include <linux/ftrace.h> 11#include <linux/module.h> 12#include <linux/init.h> 13 14#include "trace_output.h" 15 16#undef TRACE_SYSTEM 17#define TRACE_SYSTEM ftrace 18 19/* 20 * The FTRACE_ENTRY_REG macro allows ftrace entry to define register 21 * function and thus become accesible via perf. 22 */ 23#undef FTRACE_ENTRY_REG 24#define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, \ 25 filter, regfn) \ 26 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \ 27 filter) 28 29/* not needed for this file */ 30#undef __field_struct 31#define __field_struct(type, item) 32 33#undef __field 34#define __field(type, item) type item; 35 36#undef __field_desc 37#define __field_desc(type, container, item) type item; 38 39#undef __array 40#define __array(type, item, size) type item[size]; 41 42#undef __array_desc 43#define __array_desc(type, container, item, size) type item[size]; 44 45#undef __dynamic_array 46#define __dynamic_array(type, item) type item[]; 47 48#undef F_STRUCT 49#define F_STRUCT(args...) args 50 51#undef F_printk 52#define F_printk(fmt, args...) fmt, args 53 54#undef FTRACE_ENTRY 55#define FTRACE_ENTRY(name, struct_name, id, tstruct, print, filter) \ 56struct ____ftrace_##name { \ 57 tstruct \ 58}; \ 59static void __always_unused ____ftrace_check_##name(void) \ 60{ \ 61 struct ____ftrace_##name *__entry = NULL; \ 62 \ 63 /* force compile-time check on F_printk() */ \ 64 printk(print); \ 65} 66 67#undef FTRACE_ENTRY_DUP 68#define FTRACE_ENTRY_DUP(name, struct_name, id, tstruct, print, filter) \ 69 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \ 70 filter) 71 72#include "trace_entries.h" 73 74#undef __field 75#define __field(type, item) \ 76 ret = trace_define_field(event_call, #type, #item, \ 77 offsetof(typeof(field), item), \ 78 sizeof(field.item), \ 79 is_signed_type(type), filter_type); \ 80 if (ret) \ 81 return ret; 82 83#undef __field_desc 84#define __field_desc(type, container, item) \ 85 ret = trace_define_field(event_call, #type, #item, \ 86 offsetof(typeof(field), \ 87 container.item), \ 88 sizeof(field.container.item), \ 89 is_signed_type(type), filter_type); \ 90 if (ret) \ 91 return ret; 92 93#undef __array 94#define __array(type, item, len) \ 95 do { \ 96 char *type_str = #type"["__stringify(len)"]"; \ 97 BUILD_BUG_ON(len > MAX_FILTER_STR_VAL); \ 98 ret = trace_define_field(event_call, type_str, #item, \ 99 offsetof(typeof(field), item), \ 100 sizeof(field.item), \ 101 is_signed_type(type), filter_type); \ 102 if (ret) \ 103 return ret; \ 104 } while (0); 105 106#undef __array_desc 107#define __array_desc(type, container, item, len) \ 108 BUILD_BUG_ON(len > MAX_FILTER_STR_VAL); \ 109 ret = trace_define_field(event_call, #type "[" #len "]", #item, \ 110 offsetof(typeof(field), \ 111 container.item), \ 112 sizeof(field.container.item), \ 113 is_signed_type(type), filter_type); \ 114 if (ret) \ 115 return ret; 116 117#undef __dynamic_array 118#define __dynamic_array(type, item) \ 119 ret = trace_define_field(event_call, #type, #item, \ 120 offsetof(typeof(field), item), \ 121 0, is_signed_type(type), filter_type);\ 122 if (ret) \ 123 return ret; 124 125#undef FTRACE_ENTRY 126#define FTRACE_ENTRY(name, struct_name, id, tstruct, print, filter) \ 127static int __init \ 128ftrace_define_fields_##name(struct ftrace_event_call *event_call) \ 129{ \ 130 struct struct_name field; \ 131 int ret; \ 132 int filter_type = filter; \ 133 \ 134 tstruct; \ 135 \ 136 return ret; \ 137} 138 139#include "trace_entries.h" 140 141#undef __entry 142#define __entry REC 143 144#undef __field 145#define __field(type, item) 146 147#undef __field_desc 148#define __field_desc(type, container, item) 149 150#undef __array 151#define __array(type, item, len) 152 153#undef __array_desc 154#define __array_desc(type, container, item, len) 155 156#undef __dynamic_array 157#define __dynamic_array(type, item) 158 159#undef F_printk 160#define F_printk(fmt, args...) __stringify(fmt) ", " __stringify(args) 161 162#undef FTRACE_ENTRY_REG 163#define FTRACE_ENTRY_REG(call, struct_name, etype, tstruct, print, filter,\ 164 regfn) \ 165 \ 166struct ftrace_event_class __refdata event_class_ftrace_##call = { \ 167 .system = __stringify(TRACE_SYSTEM), \ 168 .define_fields = ftrace_define_fields_##call, \ 169 .fields = LIST_HEAD_INIT(event_class_ftrace_##call.fields),\ 170 .reg = regfn, \ 171}; \ 172 \ 173struct ftrace_event_call __used event_##call = { \ 174 .class = &event_class_ftrace_##call, \ 175 { \ 176 .name = #call, \ 177 }, \ 178 .event.type = etype, \ 179 .print_fmt = print, \ 180 .flags = TRACE_EVENT_FL_IGNORE_ENABLE, \ 181}; \ 182struct ftrace_event_call __used \ 183__attribute__((section("_ftrace_events"))) *__event_##call = &event_##call; 184 185#undef FTRACE_ENTRY 186#define FTRACE_ENTRY(call, struct_name, etype, tstruct, print, filter) \ 187 FTRACE_ENTRY_REG(call, struct_name, etype, \ 188 PARAMS(tstruct), PARAMS(print), filter, NULL) 189 190int ftrace_event_is_function(struct ftrace_event_call *call) 191{ 192 return call == &event_function; 193} 194 195#include "trace_entries.h" 196