trace_export.c (5327B)
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 }, 115 116#undef __array_desc 117#define __array_desc(_type, _container, _item, _len) __array(_type, _item, _len) 118 119#undef __dynamic_array 120#define __dynamic_array(_type, _item) { \ 121 .type = #_type "[]", .name = #_item, \ 122 .size = 0, .align = __alignof__(_type), \ 123 is_signed_type(_type), .filter_type = FILTER_OTHER }, 124 125#undef FTRACE_ENTRY 126#define FTRACE_ENTRY(name, struct_name, id, tstruct, print) \ 127static struct trace_event_fields ftrace_event_fields_##name[] = { \ 128 tstruct \ 129 {} }; 130 131#include "trace_entries.h" 132 133#undef __entry 134#define __entry REC 135 136#undef __field 137#define __field(type, item) 138 139#undef __field_fn 140#define __field_fn(type, item) 141 142#undef __field_desc 143#define __field_desc(type, container, item) 144 145#undef __field_packed 146#define __field_packed(type, container, item) 147 148#undef __array 149#define __array(type, item, len) 150 151#undef __array_desc 152#define __array_desc(type, container, item, len) 153 154#undef __dynamic_array 155#define __dynamic_array(type, item) 156 157#undef F_printk 158#define F_printk(fmt, args...) __stringify(fmt) ", " __stringify(args) 159 160#undef FTRACE_ENTRY_REG 161#define FTRACE_ENTRY_REG(call, struct_name, etype, tstruct, print, regfn) \ 162static struct trace_event_class __refdata event_class_ftrace_##call = { \ 163 .system = __stringify(TRACE_SYSTEM), \ 164 .fields_array = ftrace_event_fields_##call, \ 165 .fields = LIST_HEAD_INIT(event_class_ftrace_##call.fields),\ 166 .reg = regfn, \ 167}; \ 168 \ 169struct trace_event_call __used event_##call = { \ 170 .class = &event_class_ftrace_##call, \ 171 { \ 172 .name = #call, \ 173 }, \ 174 .event.type = etype, \ 175 .print_fmt = print, \ 176 .flags = TRACE_EVENT_FL_IGNORE_ENABLE, \ 177}; \ 178static struct trace_event_call __used \ 179__section("_ftrace_events") *__event_##call = &event_##call; 180 181#undef FTRACE_ENTRY 182#define FTRACE_ENTRY(call, struct_name, etype, tstruct, print) \ 183 FTRACE_ENTRY_REG(call, struct_name, etype, \ 184 PARAMS(tstruct), PARAMS(print), NULL) 185 186bool ftrace_event_is_function(struct trace_event_call *call) 187{ 188 return call == &event_function; 189} 190 191#include "trace_entries.h"