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 */ 18 static 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 accesible 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 __array 49 #define __array(type, item, size) type item[size]; 50 51 #undef __array_desc 52 #define __array_desc(type, container, item, size) type item[size]; 53 54 #undef __dynamic_array 55 #define __dynamic_array(type, item) type item[]; 56 57 #undef F_STRUCT 58 #define F_STRUCT(args...) args 59 60 #undef F_printk 61 #define F_printk(fmt, args...) fmt, args 62 63 #undef FTRACE_ENTRY 64 #define FTRACE_ENTRY(name, struct_name, id, tstruct, print) \ 65 struct ____ftrace_##name { \ 66 tstruct \ 67 }; \ 68 static void __always_unused ____ftrace_check_##name(void) \ 69 { \ 70 struct ____ftrace_##name *__entry = NULL; \ 71 \ 72 /* force compile-time check on F_printk() */ \ 73 printk(print); \ 74 } 75 76 #undef FTRACE_ENTRY_DUP 77 #define FTRACE_ENTRY_DUP(name, struct_name, id, tstruct, print) \ 78 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print)) 79 80 #include "trace_entries.h" 81 82 #undef __field_ext 83 #define __field_ext(_type, _item, _filter_type) { \ 84 .type = #_type, .name = #_item, \ 85 .size = sizeof(_type), .align = __alignof__(_type), \ 86 is_signed_type(_type), .filter_type = _filter_type }, 87 88 #undef __field 89 #define __field(_type, _item) __field_ext(_type, _item, FILTER_OTHER) 90 91 #undef __field_fn 92 #define __field_fn(_type, _item) __field_ext(_type, _item, FILTER_TRACE_FN) 93 94 #undef __field_desc 95 #define __field_desc(_type, _container, _item) __field_ext(_type, _item, FILTER_OTHER) 96 97 #undef __array 98 #define __array(_type, _item, _len) { \ 99 .type = #_type"["__stringify(_len)"]", .name = #_item, \ 100 .size = sizeof(_type[_len]), .align = __alignof__(_type), \ 101 is_signed_type(_type), .filter_type = FILTER_OTHER }, 102 103 #undef __array_desc 104 #define __array_desc(_type, _container, _item, _len) __array(_type, _item, _len) 105 106 #undef __dynamic_array 107 #define __dynamic_array(_type, _item) { \ 108 .type = #_type "[]", .name = #_item, \ 109 .size = 0, .align = __alignof__(_type), \ 110 is_signed_type(_type), .filter_type = FILTER_OTHER }, 111 112 #undef FTRACE_ENTRY 113 #define FTRACE_ENTRY(name, struct_name, id, tstruct, print) \ 114 static struct trace_event_fields ftrace_event_fields_##name[] = { \ 115 tstruct \ 116 {} }; 117 118 #include "trace_entries.h" 119 120 #undef __entry 121 #define __entry REC 122 123 #undef __field 124 #define __field(type, item) 125 126 #undef __field_fn 127 #define __field_fn(type, item) 128 129 #undef __field_desc 130 #define __field_desc(type, container, item) 131 132 #undef __array 133 #define __array(type, item, len) 134 135 #undef __array_desc 136 #define __array_desc(type, container, item, len) 137 138 #undef __dynamic_array 139 #define __dynamic_array(type, item) 140 141 #undef F_printk 142 #define F_printk(fmt, args...) __stringify(fmt) ", " __stringify(args) 143 144 #undef FTRACE_ENTRY_REG 145 #define FTRACE_ENTRY_REG(call, struct_name, etype, tstruct, print, regfn) \ 146 static struct trace_event_class __refdata event_class_ftrace_##call = { \ 147 .system = __stringify(TRACE_SYSTEM), \ 148 .fields_array = ftrace_event_fields_##call, \ 149 .fields = LIST_HEAD_INIT(event_class_ftrace_##call.fields),\ 150 .reg = regfn, \ 151 }; \ 152 \ 153 struct trace_event_call __used event_##call = { \ 154 .class = &event_class_ftrace_##call, \ 155 { \ 156 .name = #call, \ 157 }, \ 158 .event.type = etype, \ 159 .print_fmt = print, \ 160 .flags = TRACE_EVENT_FL_IGNORE_ENABLE, \ 161 }; \ 162 static struct trace_event_call __used \ 163 __attribute__((section("_ftrace_events"))) *__event_##call = &event_##call; 164 165 #undef FTRACE_ENTRY 166 #define FTRACE_ENTRY(call, struct_name, etype, tstruct, print) \ 167 FTRACE_ENTRY_REG(call, struct_name, etype, \ 168 PARAMS(tstruct), PARAMS(print), NULL) 169 170 bool ftrace_event_is_function(struct trace_event_call *call) 171 { 172 return call == &event_function; 173 } 174 175 #include "trace_entries.h" 176