Steven Rostedt (Red Hat) | ee53bbd | 2015-04-29 13:11:00 -0400 | [diff] [blame^] | 1 | /* |
| 2 | * Stage 4 of the trace events. |
| 3 | * |
| 4 | * Override the macros in <trace/trace_events.h> to include the following: |
| 5 | * |
| 6 | * For those macros defined with TRACE_EVENT: |
| 7 | * |
| 8 | * static struct ftrace_event_call event_<call>; |
| 9 | * |
| 10 | * static void ftrace_raw_event_<call>(void *__data, proto) |
| 11 | * { |
| 12 | * struct ftrace_event_file *ftrace_file = __data; |
| 13 | * struct ftrace_event_call *event_call = ftrace_file->event_call; |
| 14 | * struct ftrace_data_offsets_<call> __maybe_unused __data_offsets; |
| 15 | * unsigned long eflags = ftrace_file->flags; |
| 16 | * enum event_trigger_type __tt = ETT_NONE; |
| 17 | * struct ring_buffer_event *event; |
| 18 | * struct ftrace_raw_<call> *entry; <-- defined in stage 1 |
| 19 | * struct ring_buffer *buffer; |
| 20 | * unsigned long irq_flags; |
| 21 | * int __data_size; |
| 22 | * int pc; |
| 23 | * |
| 24 | * if (!(eflags & FTRACE_EVENT_FL_TRIGGER_COND)) { |
| 25 | * if (eflags & FTRACE_EVENT_FL_TRIGGER_MODE) |
| 26 | * event_triggers_call(ftrace_file, NULL); |
| 27 | * if (eflags & FTRACE_EVENT_FL_SOFT_DISABLED) |
| 28 | * return; |
| 29 | * } |
| 30 | * |
| 31 | * local_save_flags(irq_flags); |
| 32 | * pc = preempt_count(); |
| 33 | * |
| 34 | * __data_size = ftrace_get_offsets_<call>(&__data_offsets, args); |
| 35 | * |
| 36 | * event = trace_event_buffer_lock_reserve(&buffer, ftrace_file, |
| 37 | * event_<call>->event.type, |
| 38 | * sizeof(*entry) + __data_size, |
| 39 | * irq_flags, pc); |
| 40 | * if (!event) |
| 41 | * return; |
| 42 | * entry = ring_buffer_event_data(event); |
| 43 | * |
| 44 | * { <assign>; } <-- Here we assign the entries by the __field and |
| 45 | * __array macros. |
| 46 | * |
| 47 | * if (eflags & FTRACE_EVENT_FL_TRIGGER_COND) |
| 48 | * __tt = event_triggers_call(ftrace_file, entry); |
| 49 | * |
| 50 | * if (test_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, |
| 51 | * &ftrace_file->flags)) |
| 52 | * ring_buffer_discard_commit(buffer, event); |
| 53 | * else if (!filter_check_discard(ftrace_file, entry, buffer, event)) |
| 54 | * trace_buffer_unlock_commit(buffer, event, irq_flags, pc); |
| 55 | * |
| 56 | * if (__tt) |
| 57 | * event_triggers_post_call(ftrace_file, __tt); |
| 58 | * } |
| 59 | * |
| 60 | * static struct trace_event ftrace_event_type_<call> = { |
| 61 | * .trace = ftrace_raw_output_<call>, <-- stage 2 |
| 62 | * }; |
| 63 | * |
| 64 | * static char print_fmt_<call>[] = <TP_printk>; |
| 65 | * |
| 66 | * static struct ftrace_event_class __used event_class_<template> = { |
| 67 | * .system = "<system>", |
| 68 | * .define_fields = ftrace_define_fields_<call>, |
| 69 | * .fields = LIST_HEAD_INIT(event_class_##call.fields), |
| 70 | * .raw_init = trace_event_raw_init, |
| 71 | * .probe = ftrace_raw_event_##call, |
| 72 | * .reg = ftrace_event_reg, |
| 73 | * }; |
| 74 | * |
| 75 | * static struct ftrace_event_call event_<call> = { |
| 76 | * .class = event_class_<template>, |
| 77 | * { |
| 78 | * .tp = &__tracepoint_<call>, |
| 79 | * }, |
| 80 | * .event = &ftrace_event_type_<call>, |
| 81 | * .print_fmt = print_fmt_<call>, |
| 82 | * .flags = TRACE_EVENT_FL_TRACEPOINT, |
| 83 | * }; |
| 84 | * // its only safe to use pointers when doing linker tricks to |
| 85 | * // create an array. |
| 86 | * static struct ftrace_event_call __used |
| 87 | * __attribute__((section("_ftrace_events"))) *__event_<call> = &event_<call>; |
| 88 | * |
| 89 | */ |
| 90 | |
| 91 | #ifdef CONFIG_PERF_EVENTS |
| 92 | |
| 93 | #define _TRACE_PERF_PROTO(call, proto) \ |
| 94 | static notrace void \ |
| 95 | perf_trace_##call(void *__data, proto); |
| 96 | |
| 97 | #define _TRACE_PERF_INIT(call) \ |
| 98 | .perf_probe = perf_trace_##call, |
| 99 | |
| 100 | #else |
| 101 | #define _TRACE_PERF_PROTO(call, proto) |
| 102 | #define _TRACE_PERF_INIT(call) |
| 103 | #endif /* CONFIG_PERF_EVENTS */ |
| 104 | |
| 105 | #undef __entry |
| 106 | #define __entry entry |
| 107 | |
| 108 | #undef __field |
| 109 | #define __field(type, item) |
| 110 | |
| 111 | #undef __field_struct |
| 112 | #define __field_struct(type, item) |
| 113 | |
| 114 | #undef __array |
| 115 | #define __array(type, item, len) |
| 116 | |
| 117 | #undef __dynamic_array |
| 118 | #define __dynamic_array(type, item, len) \ |
| 119 | __entry->__data_loc_##item = __data_offsets.item; |
| 120 | |
| 121 | #undef __string |
| 122 | #define __string(item, src) __dynamic_array(char, item, -1) |
| 123 | |
| 124 | #undef __assign_str |
| 125 | #define __assign_str(dst, src) \ |
| 126 | strcpy(__get_str(dst), (src) ? (const char *)(src) : "(null)"); |
| 127 | |
| 128 | #undef __bitmask |
| 129 | #define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item, -1) |
| 130 | |
| 131 | #undef __get_bitmask |
| 132 | #define __get_bitmask(field) (char *)__get_dynamic_array(field) |
| 133 | |
| 134 | #undef __assign_bitmask |
| 135 | #define __assign_bitmask(dst, src, nr_bits) \ |
| 136 | memcpy(__get_bitmask(dst), (src), __bitmask_size_in_bytes(nr_bits)) |
| 137 | |
| 138 | #undef TP_fast_assign |
| 139 | #define TP_fast_assign(args...) args |
| 140 | |
| 141 | #undef __perf_addr |
| 142 | #define __perf_addr(a) (a) |
| 143 | |
| 144 | #undef __perf_count |
| 145 | #define __perf_count(c) (c) |
| 146 | |
| 147 | #undef __perf_task |
| 148 | #define __perf_task(t) (t) |
| 149 | |
| 150 | #undef DECLARE_EVENT_CLASS |
| 151 | #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \ |
| 152 | \ |
| 153 | static notrace void \ |
| 154 | ftrace_raw_event_##call(void *__data, proto) \ |
| 155 | { \ |
| 156 | struct ftrace_event_file *ftrace_file = __data; \ |
| 157 | struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\ |
| 158 | struct ftrace_event_buffer fbuffer; \ |
| 159 | struct ftrace_raw_##call *entry; \ |
| 160 | int __data_size; \ |
| 161 | \ |
| 162 | if (ftrace_trigger_soft_disabled(ftrace_file)) \ |
| 163 | return; \ |
| 164 | \ |
| 165 | __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \ |
| 166 | \ |
| 167 | entry = ftrace_event_buffer_reserve(&fbuffer, ftrace_file, \ |
| 168 | sizeof(*entry) + __data_size); \ |
| 169 | \ |
| 170 | if (!entry) \ |
| 171 | return; \ |
| 172 | \ |
| 173 | tstruct \ |
| 174 | \ |
| 175 | { assign; } \ |
| 176 | \ |
| 177 | ftrace_event_buffer_commit(&fbuffer); \ |
| 178 | } |
| 179 | /* |
| 180 | * The ftrace_test_probe is compiled out, it is only here as a build time check |
| 181 | * to make sure that if the tracepoint handling changes, the ftrace probe will |
| 182 | * fail to compile unless it too is updated. |
| 183 | */ |
| 184 | |
| 185 | #undef DEFINE_EVENT |
| 186 | #define DEFINE_EVENT(template, call, proto, args) \ |
| 187 | static inline void ftrace_test_probe_##call(void) \ |
| 188 | { \ |
| 189 | check_trace_callback_type_##call(ftrace_raw_event_##template); \ |
| 190 | } |
| 191 | |
| 192 | #undef DEFINE_EVENT_PRINT |
| 193 | #define DEFINE_EVENT_PRINT(template, name, proto, args, print) |
| 194 | |
| 195 | #include TRACE_INCLUDE(TRACE_INCLUDE_FILE) |
| 196 | |
| 197 | #undef __entry |
| 198 | #define __entry REC |
| 199 | |
| 200 | #undef __print_flags |
| 201 | #undef __print_symbolic |
| 202 | #undef __print_hex |
| 203 | #undef __get_dynamic_array |
| 204 | #undef __get_dynamic_array_len |
| 205 | #undef __get_str |
| 206 | #undef __get_bitmask |
| 207 | #undef __print_array |
| 208 | |
| 209 | #undef TP_printk |
| 210 | #define TP_printk(fmt, args...) "\"" fmt "\", " __stringify(args) |
| 211 | |
| 212 | #undef DECLARE_EVENT_CLASS |
| 213 | #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \ |
| 214 | _TRACE_PERF_PROTO(call, PARAMS(proto)); \ |
| 215 | static char print_fmt_##call[] = print; \ |
| 216 | static struct ftrace_event_class __used __refdata event_class_##call = { \ |
| 217 | .system = TRACE_SYSTEM_STRING, \ |
| 218 | .define_fields = ftrace_define_fields_##call, \ |
| 219 | .fields = LIST_HEAD_INIT(event_class_##call.fields),\ |
| 220 | .raw_init = trace_event_raw_init, \ |
| 221 | .probe = ftrace_raw_event_##call, \ |
| 222 | .reg = ftrace_event_reg, \ |
| 223 | _TRACE_PERF_INIT(call) \ |
| 224 | }; |
| 225 | |
| 226 | #undef DEFINE_EVENT |
| 227 | #define DEFINE_EVENT(template, call, proto, args) \ |
| 228 | \ |
| 229 | static struct ftrace_event_call __used event_##call = { \ |
| 230 | .class = &event_class_##template, \ |
| 231 | { \ |
| 232 | .tp = &__tracepoint_##call, \ |
| 233 | }, \ |
| 234 | .event.funcs = &ftrace_event_type_funcs_##template, \ |
| 235 | .print_fmt = print_fmt_##template, \ |
| 236 | .flags = TRACE_EVENT_FL_TRACEPOINT, \ |
| 237 | }; \ |
| 238 | static struct ftrace_event_call __used \ |
| 239 | __attribute__((section("_ftrace_events"))) *__event_##call = &event_##call |
| 240 | |
| 241 | #undef DEFINE_EVENT_PRINT |
| 242 | #define DEFINE_EVENT_PRINT(template, call, proto, args, print) \ |
| 243 | \ |
| 244 | static char print_fmt_##call[] = print; \ |
| 245 | \ |
| 246 | static struct ftrace_event_call __used event_##call = { \ |
| 247 | .class = &event_class_##template, \ |
| 248 | { \ |
| 249 | .tp = &__tracepoint_##call, \ |
| 250 | }, \ |
| 251 | .event.funcs = &ftrace_event_type_funcs_##call, \ |
| 252 | .print_fmt = print_fmt_##call, \ |
| 253 | .flags = TRACE_EVENT_FL_TRACEPOINT, \ |
| 254 | }; \ |
| 255 | static struct ftrace_event_call __used \ |
| 256 | __attribute__((section("_ftrace_events"))) *__event_##call = &event_##call |
| 257 | |
| 258 | #include TRACE_INCLUDE(TRACE_INCLUDE_FILE) |
| 259 | |
| 260 | #undef TRACE_SYSTEM_VAR |
| 261 | |
| 262 | #ifdef CONFIG_PERF_EVENTS |
| 263 | |
| 264 | #undef __entry |
| 265 | #define __entry entry |
| 266 | |
| 267 | #undef __get_dynamic_array |
| 268 | #define __get_dynamic_array(field) \ |
| 269 | ((void *)__entry + (__entry->__data_loc_##field & 0xffff)) |
| 270 | |
| 271 | #undef __get_dynamic_array_len |
| 272 | #define __get_dynamic_array_len(field) \ |
| 273 | ((__entry->__data_loc_##field >> 16) & 0xffff) |
| 274 | |
| 275 | #undef __get_str |
| 276 | #define __get_str(field) (char *)__get_dynamic_array(field) |
| 277 | |
| 278 | #undef __get_bitmask |
| 279 | #define __get_bitmask(field) (char *)__get_dynamic_array(field) |
| 280 | |
| 281 | #undef __perf_addr |
| 282 | #define __perf_addr(a) (__addr = (a)) |
| 283 | |
| 284 | #undef __perf_count |
| 285 | #define __perf_count(c) (__count = (c)) |
| 286 | |
| 287 | #undef __perf_task |
| 288 | #define __perf_task(t) (__task = (t)) |
| 289 | |
| 290 | #undef DECLARE_EVENT_CLASS |
| 291 | #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \ |
| 292 | static notrace void \ |
| 293 | perf_trace_##call(void *__data, proto) \ |
| 294 | { \ |
| 295 | struct ftrace_event_call *event_call = __data; \ |
| 296 | struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\ |
| 297 | struct ftrace_raw_##call *entry; \ |
| 298 | struct pt_regs *__regs; \ |
| 299 | u64 __addr = 0, __count = 1; \ |
| 300 | struct task_struct *__task = NULL; \ |
| 301 | struct hlist_head *head; \ |
| 302 | int __entry_size; \ |
| 303 | int __data_size; \ |
| 304 | int rctx; \ |
| 305 | \ |
| 306 | __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \ |
| 307 | \ |
| 308 | head = this_cpu_ptr(event_call->perf_events); \ |
| 309 | if (__builtin_constant_p(!__task) && !__task && \ |
| 310 | hlist_empty(head)) \ |
| 311 | return; \ |
| 312 | \ |
| 313 | __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),\ |
| 314 | sizeof(u64)); \ |
| 315 | __entry_size -= sizeof(u32); \ |
| 316 | \ |
| 317 | entry = perf_trace_buf_prepare(__entry_size, \ |
| 318 | event_call->event.type, &__regs, &rctx); \ |
| 319 | if (!entry) \ |
| 320 | return; \ |
| 321 | \ |
| 322 | perf_fetch_caller_regs(__regs); \ |
| 323 | \ |
| 324 | tstruct \ |
| 325 | \ |
| 326 | { assign; } \ |
| 327 | \ |
| 328 | perf_trace_buf_submit(entry, __entry_size, rctx, __addr, \ |
| 329 | __count, __regs, head, __task); \ |
| 330 | } |
| 331 | |
| 332 | /* |
| 333 | * This part is compiled out, it is only here as a build time check |
| 334 | * to make sure that if the tracepoint handling changes, the |
| 335 | * perf probe will fail to compile unless it too is updated. |
| 336 | */ |
| 337 | #undef DEFINE_EVENT |
| 338 | #define DEFINE_EVENT(template, call, proto, args) \ |
| 339 | static inline void perf_test_probe_##call(void) \ |
| 340 | { \ |
| 341 | check_trace_callback_type_##call(perf_trace_##template); \ |
| 342 | } |
| 343 | |
| 344 | |
| 345 | #undef DEFINE_EVENT_PRINT |
| 346 | #define DEFINE_EVENT_PRINT(template, name, proto, args, print) \ |
| 347 | DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args)) |
| 348 | |
| 349 | #include TRACE_INCLUDE(TRACE_INCLUDE_FILE) |
| 350 | #endif /* CONFIG_PERF_EVENTS */ |