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 /* 22 * The FTRACE_ENTRY_REG macro allows ftrace entry to define register 23 * function and thus become accesible via perf. 24 */ 25 #undef FTRACE_ENTRY_REG 26 #define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, \ 27 filter, regfn) \ 28 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \ 29 filter) 30 31 /* not needed for this file */ 32 #undef __field_struct 33 #define __field_struct(type, item) 34 35 #undef __field 36 #define __field(type, item) type item; 37 38 #undef __field_desc 39 #define __field_desc(type, container, item) type item; 40 41 #undef __array 42 #define __array(type, item, size) type item[size]; 43 44 #undef __array_desc 45 #define __array_desc(type, container, item, size) type item[size]; 46 47 #undef __dynamic_array 48 #define __dynamic_array(type, item) type item[]; 49 50 #undef F_STRUCT 51 #define F_STRUCT(args...) args 52 53 #undef F_printk 54 #define F_printk(fmt, args...) fmt, args 55 56 #undef FTRACE_ENTRY 57 #define FTRACE_ENTRY(name, struct_name, id, tstruct, print, filter) \ 58 struct ____ftrace_##name { \ 59 tstruct \ 60 }; \ 61 static void __always_unused ____ftrace_check_##name(void) \ 62 { \ 63 struct ____ftrace_##name *__entry = NULL; \ 64 \ 65 /* force compile-time check on F_printk() */ \ 66 printk(print); \ 67 } 68 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), \ 72 filter) 73 74 #include "trace_entries.h" 75 76 #undef __field 77 #define __field(type, item) \ 78 ret = trace_define_field(event_call, #type, #item, \ 79 offsetof(typeof(field), item), \ 80 sizeof(field.item), \ 81 is_signed_type(type), filter_type); \ 82 if (ret) \ 83 return ret; 84 85 #undef __field_desc 86 #define __field_desc(type, container, item) \ 87 ret = trace_define_field(event_call, #type, #item, \ 88 offsetof(typeof(field), \ 89 container.item), \ 90 sizeof(field.container.item), \ 91 is_signed_type(type), filter_type); \ 92 if (ret) \ 93 return ret; 94 95 #undef __array 96 #define __array(type, item, len) \ 97 do { \ 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); \ 107 if (ret) \ 108 return ret; \ 109 } while (0); 110 111 #undef __array_desc 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), \ 116 container.item), \ 117 sizeof(field.container.item), \ 118 is_signed_type(type), filter_type); \ 119 if (ret) \ 120 return ret; 121 122 #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);\ 127 if (ret) \ 128 return ret; 129 130 #undef FTRACE_ENTRY 131 #define FTRACE_ENTRY(name, struct_name, id, tstruct, print, filter) \ 132 static int __init \ 133 ftrace_define_fields_##name(struct ftrace_event_call *event_call) \ 134 { \ 135 struct struct_name field; \ 136 int ret; \ 137 int filter_type = filter; \ 138 \ 139 tstruct; \ 140 \ 141 return ret; \ 142 } 143 144 #include "trace_entries.h" 145 146 #undef __entry 147 #define __entry REC 148 149 #undef __field 150 #define __field(type, item) 151 152 #undef __field_desc 153 #define __field_desc(type, container, item) 154 155 #undef __array 156 #define __array(type, item, len) 157 158 #undef __array_desc 159 #define __array_desc(type, container, item, len) 160 161 #undef __dynamic_array 162 #define __dynamic_array(type, item) 163 164 #undef F_printk 165 #define F_printk(fmt, args...) __stringify(fmt) ", " __stringify(args) 166 167 #undef FTRACE_ENTRY_REG 168 #define FTRACE_ENTRY_REG(call, struct_name, etype, tstruct, print, filter,\ 169 regfn) \ 170 \ 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),\ 175 .reg = regfn, \ 176 }; \ 177 \ 178 struct ftrace_event_call __used event_##call = { \ 179 .name = #call, \ 180 .event.type = etype, \ 181 .class = &event_class_ftrace_##call, \ 182 .print_fmt = print, \ 183 .flags = TRACE_EVENT_FL_IGNORE_ENABLE, \ 184 }; \ 185 struct ftrace_event_call __used \ 186 __attribute__((section("_ftrace_events"))) *__event_##call = &event_##call; 187 188 #undef FTRACE_ENTRY 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) 192 193 int ftrace_event_is_function(struct ftrace_event_call *call) 194 { 195 return call == &event_function; 196 } 197 198 #include "trace_entries.h" 199