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 /* not needed for this file */ 22 #undef __field_struct 23 #define __field_struct(type, item) 24 25 #undef __field 26 #define __field(type, item) type item; 27 28 #undef __field_desc 29 #define __field_desc(type, container, item) type item; 30 31 #undef __array 32 #define __array(type, item, size) type item[size]; 33 34 #undef __array_desc 35 #define __array_desc(type, container, item, size) type item[size]; 36 37 #undef __dynamic_array 38 #define __dynamic_array(type, item) type item[]; 39 40 #undef F_STRUCT 41 #define F_STRUCT(args...) args 42 43 #undef F_printk 44 #define F_printk(fmt, args...) fmt, args 45 46 #undef FTRACE_ENTRY 47 #define FTRACE_ENTRY(name, struct_name, id, tstruct, print) \ 48 struct ____ftrace_##name { \ 49 tstruct \ 50 }; \ 51 static void __always_unused ____ftrace_check_##name(void) \ 52 { \ 53 struct ____ftrace_##name *__entry = NULL; \ 54 \ 55 /* force compile-time check on F_printk() */ \ 56 printk(print); \ 57 } 58 59 #undef FTRACE_ENTRY_DUP 60 #define FTRACE_ENTRY_DUP(name, struct_name, id, tstruct, print) \ 61 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print)) 62 63 #include "trace_entries.h" 64 65 #undef __field 66 #define __field(type, item) \ 67 ret = trace_define_field(event_call, #type, #item, \ 68 offsetof(typeof(field), item), \ 69 sizeof(field.item), \ 70 is_signed_type(type), FILTER_OTHER); \ 71 if (ret) \ 72 return ret; 73 74 #undef __field_desc 75 #define __field_desc(type, container, item) \ 76 ret = trace_define_field(event_call, #type, #item, \ 77 offsetof(typeof(field), \ 78 container.item), \ 79 sizeof(field.container.item), \ 80 is_signed_type(type), FILTER_OTHER); \ 81 if (ret) \ 82 return ret; 83 84 #undef __array 85 #define __array(type, item, len) \ 86 do { \ 87 BUILD_BUG_ON(len > MAX_FILTER_STR_VAL); \ 88 mutex_lock(&event_storage_mutex); \ 89 snprintf(event_storage, sizeof(event_storage), \ 90 "%s[%d]", #type, len); \ 91 ret = trace_define_field(event_call, event_storage, #item, \ 92 offsetof(typeof(field), item), \ 93 sizeof(field.item), \ 94 is_signed_type(type), FILTER_OTHER); \ 95 mutex_unlock(&event_storage_mutex); \ 96 if (ret) \ 97 return ret; \ 98 } while (0); 99 100 #undef __array_desc 101 #define __array_desc(type, container, item, len) \ 102 BUILD_BUG_ON(len > MAX_FILTER_STR_VAL); \ 103 ret = trace_define_field(event_call, #type "[" #len "]", #item, \ 104 offsetof(typeof(field), \ 105 container.item), \ 106 sizeof(field.container.item), \ 107 is_signed_type(type), FILTER_OTHER); \ 108 if (ret) \ 109 return ret; 110 111 #undef __dynamic_array 112 #define __dynamic_array(type, item) \ 113 ret = trace_define_field(event_call, #type, #item, \ 114 offsetof(typeof(field), item), \ 115 0, is_signed_type(type), FILTER_OTHER);\ 116 if (ret) \ 117 return ret; 118 119 #undef FTRACE_ENTRY 120 #define FTRACE_ENTRY(name, struct_name, id, tstruct, print) \ 121 int \ 122 ftrace_define_fields_##name(struct ftrace_event_call *event_call) \ 123 { \ 124 struct struct_name field; \ 125 int ret; \ 126 \ 127 tstruct; \ 128 \ 129 return ret; \ 130 } 131 132 #include "trace_entries.h" 133 134 #undef __entry 135 #define __entry REC 136 137 #undef __field 138 #define __field(type, item) 139 140 #undef __field_desc 141 #define __field_desc(type, container, item) 142 143 #undef __array 144 #define __array(type, item, len) 145 146 #undef __array_desc 147 #define __array_desc(type, container, item, len) 148 149 #undef __dynamic_array 150 #define __dynamic_array(type, item) 151 152 #undef F_printk 153 #define F_printk(fmt, args...) __stringify(fmt) ", " __stringify(args) 154 155 #undef FTRACE_ENTRY 156 #define FTRACE_ENTRY(call, struct_name, etype, tstruct, print) \ 157 \ 158 struct ftrace_event_class event_class_ftrace_##call = { \ 159 .system = __stringify(TRACE_SYSTEM), \ 160 .define_fields = ftrace_define_fields_##call, \ 161 .fields = LIST_HEAD_INIT(event_class_ftrace_##call.fields),\ 162 }; \ 163 \ 164 struct ftrace_event_call __used event_##call = { \ 165 .name = #call, \ 166 .event.type = etype, \ 167 .class = &event_class_ftrace_##call, \ 168 .print_fmt = print, \ 169 }; \ 170 struct ftrace_event_call __used \ 171 __attribute__((section("_ftrace_events"))) *__event_##call = &event_##call; 172 173 #include "trace_entries.h" 174