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, regfn) \ 27 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print)) 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) \ 56 struct ____ftrace_##name { \ 57 tstruct \ 58 }; \ 59 static 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) \ 69 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print)) 70 71 #include "trace_entries.h" 72 73 #undef __field 74 #define __field(type, item) \ 75 ret = trace_define_field(event_call, #type, #item, \ 76 offsetof(typeof(field), item), \ 77 sizeof(field.item), \ 78 is_signed_type(type), FILTER_OTHER); \ 79 if (ret) \ 80 return ret; 81 82 #undef __field_desc 83 #define __field_desc(type, container, item) \ 84 ret = trace_define_field(event_call, #type, #item, \ 85 offsetof(typeof(field), \ 86 container.item), \ 87 sizeof(field.container.item), \ 88 is_signed_type(type), FILTER_OTHER); \ 89 if (ret) \ 90 return ret; 91 92 #undef __array 93 #define __array(type, item, len) \ 94 do { \ 95 BUILD_BUG_ON(len > MAX_FILTER_STR_VAL); \ 96 mutex_lock(&event_storage_mutex); \ 97 snprintf(event_storage, sizeof(event_storage), \ 98 "%s[%d]", #type, len); \ 99 ret = trace_define_field(event_call, event_storage, #item, \ 100 offsetof(typeof(field), item), \ 101 sizeof(field.item), \ 102 is_signed_type(type), FILTER_OTHER); \ 103 mutex_unlock(&event_storage_mutex); \ 104 if (ret) \ 105 return ret; \ 106 } while (0); 107 108 #undef __array_desc 109 #define __array_desc(type, container, item, len) \ 110 BUILD_BUG_ON(len > MAX_FILTER_STR_VAL); \ 111 ret = trace_define_field(event_call, #type "[" #len "]", #item, \ 112 offsetof(typeof(field), \ 113 container.item), \ 114 sizeof(field.container.item), \ 115 is_signed_type(type), FILTER_OTHER); \ 116 if (ret) \ 117 return ret; 118 119 #undef __dynamic_array 120 #define __dynamic_array(type, item) \ 121 ret = trace_define_field(event_call, #type, #item, \ 122 offsetof(typeof(field), item), \ 123 0, is_signed_type(type), FILTER_OTHER);\ 124 if (ret) \ 125 return ret; 126 127 #undef FTRACE_ENTRY 128 #define FTRACE_ENTRY(name, struct_name, id, tstruct, print) \ 129 int \ 130 ftrace_define_fields_##name(struct ftrace_event_call *event_call) \ 131 { \ 132 struct struct_name field; \ 133 int ret; \ 134 \ 135 tstruct; \ 136 \ 137 return ret; \ 138 } 139 140 #include "trace_entries.h" 141 142 #undef __entry 143 #define __entry REC 144 145 #undef __field 146 #define __field(type, item) 147 148 #undef __field_desc 149 #define __field_desc(type, container, item) 150 151 #undef __array 152 #define __array(type, item, len) 153 154 #undef __array_desc 155 #define __array_desc(type, container, item, len) 156 157 #undef __dynamic_array 158 #define __dynamic_array(type, item) 159 160 #undef F_printk 161 #define F_printk(fmt, args...) #fmt ", " __stringify(args) 162 163 #undef FTRACE_ENTRY_REG 164 #define FTRACE_ENTRY_REG(call, struct_name, etype, tstruct, print, regfn)\ 165 \ 166 struct ftrace_event_class 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 \ 173 struct ftrace_event_call __used event_##call = { \ 174 .name = #call, \ 175 .event.type = etype, \ 176 .class = &event_class_ftrace_##call, \ 177 .print_fmt = print, \ 178 }; \ 179 struct ftrace_event_call __used \ 180 __attribute__((section("_ftrace_events"))) *__event_##call = &event_##call; 181 182 #undef FTRACE_ENTRY 183 #define FTRACE_ENTRY(call, struct_name, etype, tstruct, print) \ 184 FTRACE_ENTRY_REG(call, struct_name, etype, \ 185 PARAMS(tstruct), PARAMS(print), NULL) 186 187 int ftrace_event_is_function(struct ftrace_event_call *call) 188 { 189 return call == &event_function; 190 } 191 192 #include "trace_entries.h" 193