include/trace/trace_events.h

   1 /*
   2  * Stage 1 of the trace events.
   3  *
   4  * Override the macros in <trace/trace_events.h> to include the following:
   5  *
   6  * struct trace_event_raw_<call> {
   7  *      struct trace_entry              ent;
   8  *      <type>                          <item>;
   9  *      <type2>                         <item2>[<len>];
  10  *      [...]
  11  * };
  12  *
  13  * The <type> <item> is created by the __field(type, item) macro or
  14  * the __array(type2, item2, len) macro.
  15  * We simply do "type item;", and that will create the fields
  16  * in the structure.
  17  */
  18
  19 #include <linux/trace_events.h>
  20
  21 #ifndef TRACE_SYSTEM_VAR
  22 #define TRACE_SYSTEM_VAR TRACE_SYSTEM
  23 #endif
  24
  25 #define __app__(x, y) str__##x##y
  26 #define __app(x, y) __app__(x, y)
  27
  28 #define TRACE_SYSTEM_STRING __app(TRACE_SYSTEM_VAR,__trace_system_name)
  29
  30 #define TRACE_MAKE_SYSTEM_STR()                         \
  31         static const char TRACE_SYSTEM_STRING[] =       \
  32                 __stringify(TRACE_SYSTEM)
  33
  34 TRACE_MAKE_SYSTEM_STR();
  35
  36 #undef TRACE_DEFINE_ENUM
  37 #define TRACE_DEFINE_ENUM(a)                            \
  38         static struct trace_eval_map __used __initdata  \
  39         __##TRACE_SYSTEM##_##a =                        \
  40         {                                               \
  41                 .system = TRACE_SYSTEM_STRING,          \
  42                 .eval_string = #a,                      \
  43                 .eval_value = a                         \
  44         };                                              \
  45         static struct trace_eval_map __used             \
  46         __attribute__((section("_ftrace_eval_map")))    \
  47         *TRACE_SYSTEM##_##a = &__##TRACE_SYSTEM##_##a
  48
  49 #undef TRACE_DEFINE_SIZEOF
  50 #define TRACE_DEFINE_SIZEOF(a)                          \
  51         static struct trace_eval_map __used __initdata  \
  52         __##TRACE_SYSTEM##_##a =                        \
  53         {                                               \
  54                 .system = TRACE_SYSTEM_STRING,          \
  55                 .eval_string = "sizeof(" #a ")",        \
  56                 .eval_value = sizeof(a)                 \
  57         };                                              \
  58         static struct trace_eval_map __used             \
  59         __attribute__((section("_ftrace_eval_map")))    \
  60         *TRACE_SYSTEM##_##a = &__##TRACE_SYSTEM##_##a
  61
  62 /*
  63  * DECLARE_EVENT_CLASS can be used to add a generic function
  64  * handlers for events. That is, if all events have the same
  65  * parameters and just have distinct trace points.
  66  * Each tracepoint can be defined with DEFINE_EVENT and that
  67  * will map the DECLARE_EVENT_CLASS to the tracepoint.
  68  *
  69  * TRACE_EVENT is a one to one mapping between tracepoint and template.
  70  */
  71 #undef TRACE_EVENT
  72 #define TRACE_EVENT(name, proto, args, tstruct, assign, print) \
  73         DECLARE_EVENT_CLASS(name,                              \
  74                              PARAMS(proto),                    \
  75                              PARAMS(args),                     \
  76                              PARAMS(tstruct),                  \
  77                              PARAMS(assign),                   \
  78                              PARAMS(print));                   \
  79         DEFINE_EVENT(name, name, PARAMS(proto), PARAMS(args));
  80
  81
  82 #undef __field
  83 #define __field(type, item)             type    item;
  84
  85 #undef __field_ext
  86 #define __field_ext(type, item, filter_type)    type    item;
  87
  88 #undef __field_struct
  89 #define __field_struct(type, item)      type    item;
  90
  91 #undef __field_struct_ext
  92 #define __field_struct_ext(type, item, filter_type)     type    item;
  93
  94 #undef __array
  95 #define __array(type, item, len)        type    item[len];
  96
  97 #undef __dynamic_array
  98 #define __dynamic_array(type, item, len) u32 __data_loc_##item;
  99
 100 #undef __string
 101 #define __string(item, src) __dynamic_array(char, item, -1)
 102
 103 #undef __bitmask
 104 #define __bitmask(item, nr_bits) __dynamic_array(char, item, -1)
 105
 106 #undef TP_STRUCT__entry
 107 #define TP_STRUCT__entry(args...) args
 108
 109 #undef DECLARE_EVENT_CLASS
 110 #define DECLARE_EVENT_CLASS(name, proto, args, tstruct, assign, print)  \
 111         struct trace_event_raw_##name {                                 \
 112                 struct trace_entry      ent;                            \
 113                 tstruct                                                 \
 114                 char                    __data[0];                      \
 115         };                                                              \
 116                                                                         \
 117         static struct trace_event_class event_class_##name;
 118
 119 #undef DEFINE_EVENT
 120 #define DEFINE_EVENT(template, name, proto, args)       \
 121         static struct trace_event_call  __used          \
 122         __attribute__((__aligned__(4))) event_##name
 123
 124 #undef DEFINE_EVENT_FN
 125 #define DEFINE_EVENT_FN(template, name, proto, args, reg, unreg)        \
 126         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 127
 128 #undef DEFINE_EVENT_PRINT
 129 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
 130         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 131
 132 /* Callbacks are meaningless to ftrace. */
 133 #undef TRACE_EVENT_FN
 134 #define TRACE_EVENT_FN(name, proto, args, tstruct,                      \
 135                 assign, print, reg, unreg)                              \
 136         TRACE_EVENT(name, PARAMS(proto), PARAMS(args),                  \
 137                 PARAMS(tstruct), PARAMS(assign), PARAMS(print))         \
 138
 139 #undef TRACE_EVENT_FN_COND
 140 #define TRACE_EVENT_FN_COND(name, proto, args, cond, tstruct,   \
 141                 assign, print, reg, unreg)                              \
 142         TRACE_EVENT_CONDITION(name, PARAMS(proto), PARAMS(args), PARAMS(cond),          \
 143                 PARAMS(tstruct), PARAMS(assign), PARAMS(print))         \
 144
 145 #undef TRACE_EVENT_FLAGS
 146 #define TRACE_EVENT_FLAGS(name, value)                                  \
 147         __TRACE_EVENT_FLAGS(name, value)
 148
 149 #undef TRACE_EVENT_PERF_PERM
 150 #define TRACE_EVENT_PERF_PERM(name, expr...)                            \
 151         __TRACE_EVENT_PERF_PERM(name, expr)
 152
 153 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 154
 155 /*
 156  * Stage 2 of the trace events.
 157  *
 158  * Include the following:
 159  *
 160  * struct trace_event_data_offsets_<call> {
 161  *      u32                             <item1>;
 162  *      u32                             <item2>;
 163  *      [...]
 164  * };
 165  *
 166  * The __dynamic_array() macro will create each u32 <item>, this is
 167  * to keep the offset of each array from the beginning of the event.
 168  * The size of an array is also encoded, in the higher 16 bits of <item>.
 169  */
 170
 171 #undef TRACE_DEFINE_ENUM
 172 #define TRACE_DEFINE_ENUM(a)
 173
 174 #undef TRACE_DEFINE_SIZEOF
 175 #define TRACE_DEFINE_SIZEOF(a)
 176
 177 #undef __field
 178 #define __field(type, item)
 179
 180 #undef __field_ext
 181 #define __field_ext(type, item, filter_type)
 182
 183 #undef __field_struct
 184 #define __field_struct(type, item)
 185
 186 #undef __field_struct_ext
 187 #define __field_struct_ext(type, item, filter_type)
 188
 189 #undef __array
 190 #define __array(type, item, len)
 191
 192 #undef __dynamic_array
 193 #define __dynamic_array(type, item, len)        u32 item;
 194
 195 #undef __string
 196 #define __string(item, src) __dynamic_array(char, item, -1)
 197
 198 #undef __bitmask
 199 #define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item, -1)
 200
 201 #undef DECLARE_EVENT_CLASS
 202 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 203         struct trace_event_data_offsets_##call {                        \
 204                 tstruct;                                                \
 205         };
 206
 207 #undef DEFINE_EVENT
 208 #define DEFINE_EVENT(template, name, proto, args)
 209
 210 #undef DEFINE_EVENT_PRINT
 211 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
 212         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 213
 214 #undef TRACE_EVENT_FLAGS
 215 #define TRACE_EVENT_FLAGS(event, flag)
 216
 217 #undef TRACE_EVENT_PERF_PERM
 218 #define TRACE_EVENT_PERF_PERM(event, expr...)
 219
 220 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 221
 222 /*
 223  * Stage 3 of the trace events.
 224  *
 225  * Override the macros in <trace/trace_events.h> to include the following:
 226  *
 227  * enum print_line_t
 228  * trace_raw_output_<call>(struct trace_iterator *iter, int flags)
 229  * {
 230  *      struct trace_seq *s = &iter->seq;
 231  *      struct trace_event_raw_<call> *field; <-- defined in stage 1
 232  *      struct trace_entry *entry;
 233  *      struct trace_seq *p = &iter->tmp_seq;
 234  *      int ret;
 235  *
 236  *      entry = iter->ent;
 237  *
 238  *      if (entry->type != event_<call>->event.type) {
 239  *              WARN_ON_ONCE(1);
 240  *              return TRACE_TYPE_UNHANDLED;
 241  *      }
 242  *
 243  *      field = (typeof(field))entry;
 244  *
 245  *      trace_seq_init(p);
 246  *      ret = trace_seq_printf(s, "%s: ", <call>);
 247  *      if (ret)
 248  *              ret = trace_seq_printf(s, <TP_printk> "\n");
 249  *      if (!ret)
 250  *              return TRACE_TYPE_PARTIAL_LINE;
 251  *
 252  *      return TRACE_TYPE_HANDLED;
 253  * }
 254  *
 255  * This is the method used to print the raw event to the trace
 256  * output format. Note, this is not needed if the data is read
 257  * in binary.
 258  */
 259
 260 #undef __entry
 261 #define __entry field
 262
 263 #undef TP_printk
 264 #define TP_printk(fmt, args...) fmt "\n", args
 265
 266 #undef __get_dynamic_array
 267 #define __get_dynamic_array(field)      \
 268                 ((void *)__entry + (__entry->__data_loc_##field & 0xffff))
 269
 270 #undef __get_dynamic_array_len
 271 #define __get_dynamic_array_len(field)  \
 272                 ((__entry->__data_loc_##field >> 16) & 0xffff)
 273
 274 #undef __get_str
 275 #define __get_str(field) ((char *)__get_dynamic_array(field))
 276
 277 #undef __get_bitmask
 278 #define __get_bitmask(field)                                            \
 279         ({                                                              \
 280                 void *__bitmask = __get_dynamic_array(field);           \
 281                 unsigned int __bitmask_size;                            \
 282                 __bitmask_size = __get_dynamic_array_len(field);        \
 283                 trace_print_bitmask_seq(p, __bitmask, __bitmask_size);  \
 284         })
 285
 286 #undef __print_flags
 287 #define __print_flags(flag, delim, flag_array...)                       \
 288         ({                                                              \
 289                 static const struct trace_print_flags __flags[] =       \
 290                         { flag_array, { -1, NULL }};                    \
 291                 trace_print_flags_seq(p, delim, flag, __flags); \
 292         })
 293
 294 #undef __print_symbolic
 295 #define __print_symbolic(value, symbol_array...)                        \
 296         ({                                                              \
 297                 static const struct trace_print_flags symbols[] =       \
 298                         { symbol_array, { -1, NULL }};                  \
 299                 trace_print_symbols_seq(p, value, symbols);             \
 300         })
 301
 302 #undef __print_flags_u64
 303 #undef __print_symbolic_u64
 304 #if BITS_PER_LONG == 32
 305 #define __print_flags_u64(flag, delim, flag_array...)                   \
 306         ({                                                              \
 307                 static const struct trace_print_flags_u64 __flags[] =   \
 308                         { flag_array, { -1, NULL } };                   \
 309                 trace_print_flags_seq_u64(p, delim, flag, __flags);     \
 310         })
 311
 312 #define __print_symbolic_u64(value, symbol_array...)                    \
 313         ({                                                              \
 314                 static const struct trace_print_flags_u64 symbols[] =   \
 315                         { symbol_array, { -1, NULL } };                 \
 316                 trace_print_symbols_seq_u64(p, value, symbols); \
 317         })
 318 #else
 319 #define __print_flags_u64(flag, delim, flag_array...)                   \
 320                         __print_flags(flag, delim, flag_array)
 321
 322 #define __print_symbolic_u64(value, symbol_array...)                    \
 323                         __print_symbolic(value, symbol_array)
 324 #endif
 325
 326 #undef __print_hex
 327 #define __print_hex(buf, buf_len)                                       \
 328         trace_print_hex_seq(p, buf, buf_len, false)
 329
 330 #undef __print_hex_str
 331 #define __print_hex_str(buf, buf_len)                                   \
 332         trace_print_hex_seq(p, buf, buf_len, true)
 333
 334 #undef __print_array
 335 #define __print_array(array, count, el_size)                            \
 336         ({                                                              \
 337                 BUILD_BUG_ON(el_size != 1 && el_size != 2 &&            \
 338                              el_size != 4 && el_size != 8);             \
 339                 trace_print_array_seq(p, array, count, el_size);        \
 340         })
 341
 342 #undef DECLARE_EVENT_CLASS
 343 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 344 static notrace enum print_line_t                                        \
 345 trace_raw_output_##call(struct trace_iterator *iter, int flags,         \
 346                         struct trace_event *trace_event)                \
 347 {                                                                       \
 348         struct trace_seq *s = &iter->seq;                               \
 349         struct trace_seq __maybe_unused *p = &iter->tmp_seq;            \
 350         struct trace_event_raw_##call *field;                           \
 351         int ret;                                                        \
 352                                                                         \
 353         field = (typeof(field))iter->ent;                               \
 354                                                                         \
 355         ret = trace_raw_output_prep(iter, trace_event);                 \
 356         if (ret != TRACE_TYPE_HANDLED)                                  \
 357                 return ret;                                             \
 358                                                                         \
 359         trace_seq_printf(s, print);                                     \
 360                                                                         \
 361         return trace_handle_return(s);                                  \
 362 }                                                                       \
 363 static struct trace_event_functions trace_event_type_funcs_##call = {   \
 364         .trace                  = trace_raw_output_##call,              \
 365 };
 366
 367 #undef DEFINE_EVENT_PRINT
 368 #define DEFINE_EVENT_PRINT(template, call, proto, args, print)          \
 369 static notrace enum print_line_t                                        \
 370 trace_raw_output_##call(struct trace_iterator *iter, int flags,         \
 371                          struct trace_event *event)                     \
 372 {                                                                       \
 373         struct trace_event_raw_##template *field;                       \
 374         struct trace_entry *entry;                                      \
 375         struct trace_seq *p = &iter->tmp_seq;                           \
 376                                                                         \
 377         entry = iter->ent;                                              \
 378                                                                         \
 379         if (entry->type != event_##call.event.type) {                   \
 380                 WARN_ON_ONCE(1);                                        \
 381                 return TRACE_TYPE_UNHANDLED;                            \
 382         }                                                               \
 383                                                                         \
 384         field = (typeof(field))entry;                                   \
 385                                                                         \
 386         trace_seq_init(p);                                              \
 387         return trace_output_call(iter, #call, print);                   \
 388 }                                                                       \
 389 static struct trace_event_functions trace_event_type_funcs_##call = {   \
 390         .trace                  = trace_raw_output_##call,              \
 391 };
 392
 393 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 394
 395 #undef __field_ext
 396 #define __field_ext(type, item, filter_type)                            \
 397         ret = trace_define_field(event_call, #type, #item,              \
 398                                  offsetof(typeof(field), item),         \
 399                                  sizeof(field.item),                    \
 400                                  is_signed_type(type), filter_type);    \
 401         if (ret)                                                        \
 402                 return ret;
 403
 404 #undef __field_struct_ext
 405 #define __field_struct_ext(type, item, filter_type)                     \
 406         ret = trace_define_field(event_call, #type, #item,              \
 407                                  offsetof(typeof(field), item),         \
 408                                  sizeof(field.item),                    \
 409                                  0, filter_type);                       \
 410         if (ret)                                                        \
 411                 return ret;
 412
 413 #undef __field
 414 #define __field(type, item)     __field_ext(type, item, FILTER_OTHER)
 415
 416 #undef __field_struct
 417 #define __field_struct(type, item) __field_struct_ext(type, item, FILTER_OTHER)
 418
 419 #undef __array
 420 #define __array(type, item, len)                                        \
 421         do {                                                            \
 422                 char *type_str = #type"["__stringify(len)"]";           \
 423                 BUILD_BUG_ON(len > MAX_FILTER_STR_VAL);                 \
 424                 ret = trace_define_field(event_call, type_str, #item,   \
 425                                  offsetof(typeof(field), item),         \
 426                                  sizeof(field.item),                    \
 427                                  is_signed_type(type), FILTER_OTHER);   \
 428                 if (ret)                                                \
 429                         return ret;                                     \
 430         } while (0);
 431
 432 #undef __dynamic_array
 433 #define __dynamic_array(type, item, len)                                       \
 434         ret = trace_define_field(event_call, "__data_loc " #type "[]", #item,  \
 435                                  offsetof(typeof(field), __data_loc_##item),   \
 436                                  sizeof(field.__data_loc_##item),              \
 437                                  is_signed_type(type), FILTER_OTHER);
 438
 439 #undef __string
 440 #define __string(item, src) __dynamic_array(char, item, -1)
 441
 442 #undef __bitmask
 443 #define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item, -1)
 444
 445 #undef DECLARE_EVENT_CLASS
 446 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, func, print)    \
 447 static int notrace __init                                               \
 448 trace_event_define_fields_##call(struct trace_event_call *event_call)   \
 449 {                                                                       \
 450         struct trace_event_raw_##call field;                            \
 451         int ret;                                                        \
 452                                                                         \
 453         tstruct;                                                        \
 454                                                                         \
 455         return ret;                                                     \
 456 }
 457
 458 #undef DEFINE_EVENT
 459 #define DEFINE_EVENT(template, name, proto, args)
 460
 461 #undef DEFINE_EVENT_PRINT
 462 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
 463         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 464
 465 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 466
 467 /*
 468  * remember the offset of each array from the beginning of the event.
 469  */
 470
 471 #undef __entry
 472 #define __entry entry
 473
 474 #undef __field
 475 #define __field(type, item)
 476
 477 #undef __field_ext
 478 #define __field_ext(type, item, filter_type)
 479
 480 #undef __field_struct
 481 #define __field_struct(type, item)
 482
 483 #undef __field_struct_ext
 484 #define __field_struct_ext(type, item, filter_type)
 485
 486 #undef __array
 487 #define __array(type, item, len)
 488
 489 #undef __dynamic_array
 490 #define __dynamic_array(type, item, len)                                \
 491         __item_length = (len) * sizeof(type);                           \
 492         __data_offsets->item = __data_size +                            \
 493                                offsetof(typeof(*entry), __data);        \
 494         __data_offsets->item |= __item_length << 16;                    \
 495         __data_size += __item_length;
 496
 497 #undef __string
 498 #define __string(item, src) __dynamic_array(char, item,                 \
 499                     strlen((src) ? (const char *)(src) : "(null)") + 1)
 500
 501 /*
 502  * __bitmask_size_in_bytes_raw is the number of bytes needed to hold
 503  * num_possible_cpus().
 504  */
 505 #define __bitmask_size_in_bytes_raw(nr_bits)    \
 506         (((nr_bits) + 7) / 8)
 507
 508 #define __bitmask_size_in_longs(nr_bits)                        \
 509         ((__bitmask_size_in_bytes_raw(nr_bits) +                \
 510           ((BITS_PER_LONG / 8) - 1)) / (BITS_PER_LONG / 8))
 511
 512 /*
 513  * __bitmask_size_in_bytes is the number of bytes needed to hold
 514  * num_possible_cpus() padded out to the nearest long. This is what
 515  * is saved in the buffer, just to be consistent.
 516  */
 517 #define __bitmask_size_in_bytes(nr_bits)                                \
 518         (__bitmask_size_in_longs(nr_bits) * (BITS_PER_LONG / 8))
 519
 520 #undef __bitmask
 521 #define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item,   \
 522                                          __bitmask_size_in_longs(nr_bits))
 523
 524 #undef DECLARE_EVENT_CLASS
 525 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 526 static inline notrace int trace_event_get_offsets_##call(               \
 527         struct trace_event_data_offsets_##call *__data_offsets, proto)  \
 528 {                                                                       \
 529         int __data_size = 0;                                            \
 530         int __maybe_unused __item_length;                               \
 531         struct trace_event_raw_##call __maybe_unused *entry;            \
 532                                                                         \
 533         tstruct;                                                        \
 534                                                                         \
 535         return __data_size;                                             \
 536 }
 537
 538 #undef DEFINE_EVENT
 539 #define DEFINE_EVENT(template, name, proto, args)
 540
 541 #undef DEFINE_EVENT_PRINT
 542 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
 543         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 544
 545 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 546
 547 /*
 548  * Stage 4 of the trace events.
 549  *
 550  * Override the macros in <trace/trace_events.h> to include the following:
 551  *
 552  * For those macros defined with TRACE_EVENT:
 553  *
 554  * static struct trace_event_call event_<call>;
 555  *
 556  * static void trace_event_raw_event_<call>(void *__data, proto)
 557  * {
 558  *      struct trace_event_file *trace_file = __data;
 559  *      struct trace_event_call *event_call = trace_file->event_call;
 560  *      struct trace_event_data_offsets_<call> __maybe_unused __data_offsets;
 561  *      unsigned long eflags = trace_file->flags;
 562  *      enum event_trigger_type __tt = ETT_NONE;
 563  *      struct ring_buffer_event *event;
 564  *      struct trace_event_raw_<call> *entry; <-- defined in stage 1
 565  *      struct ring_buffer *buffer;
 566  *      unsigned long irq_flags;
 567  *      int __data_size;
 568  *      int pc;
 569  *
 570  *      if (!(eflags & EVENT_FILE_FL_TRIGGER_COND)) {
 571  *              if (eflags & EVENT_FILE_FL_TRIGGER_MODE)
 572  *                      event_triggers_call(trace_file, NULL);
 573  *              if (eflags & EVENT_FILE_FL_SOFT_DISABLED)
 574  *                      return;
 575  *      }
 576  *
 577  *      local_save_flags(irq_flags);
 578  *      pc = preempt_count();
 579  *
 580  *      __data_size = trace_event_get_offsets_<call>(&__data_offsets, args);
 581  *
 582  *      event = trace_event_buffer_lock_reserve(&buffer, trace_file,
 583  *                                event_<call>->event.type,
 584  *                                sizeof(*entry) + __data_size,
 585  *                                irq_flags, pc);
 586  *      if (!event)
 587  *              return;
 588  *      entry   = ring_buffer_event_data(event);
 589  *
 590  *      { <assign>; }  <-- Here we assign the entries by the __field and
 591  *                         __array macros.
 592  *
 593  *      if (eflags & EVENT_FILE_FL_TRIGGER_COND)
 594  *              __tt = event_triggers_call(trace_file, entry);
 595  *
 596  *      if (test_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT,
 597  *                   &trace_file->flags))
 598  *              ring_buffer_discard_commit(buffer, event);
 599  *      else if (!filter_check_discard(trace_file, entry, buffer, event))
 600  *              trace_buffer_unlock_commit(buffer, event, irq_flags, pc);
 601  *
 602  *      if (__tt)
 603  *              event_triggers_post_call(trace_file, __tt);
 604  * }
 605  *
 606  * static struct trace_event ftrace_event_type_<call> = {
 607  *      .trace                  = trace_raw_output_<call>, <-- stage 2
 608  * };
 609  *
 610  * static char print_fmt_<call>[] = <TP_printk>;
 611  *
 612  * static struct trace_event_class __used event_class_<template> = {
 613  *      .system                 = "<system>",
 614  *      .define_fields          = trace_event_define_fields_<call>,
 615  *      .fields                 = LIST_HEAD_INIT(event_class_##call.fields),
 616  *      .raw_init               = trace_event_raw_init,
 617  *      .probe                  = trace_event_raw_event_##call,
 618  *      .reg                    = trace_event_reg,
 619  * };
 620  *
 621  * static struct trace_event_call event_<call> = {
 622  *      .class                  = event_class_<template>,
 623  *      {
 624  *              .tp                     = &__tracepoint_<call>,
 625  *      },
 626  *      .event                  = &ftrace_event_type_<call>,
 627  *      .print_fmt              = print_fmt_<call>,
 628  *      .flags                  = TRACE_EVENT_FL_TRACEPOINT,
 629  * };
 630  * // its only safe to use pointers when doing linker tricks to
 631  * // create an array.
 632  * static struct trace_event_call __used
 633  * __attribute__((section("_ftrace_events"))) *__event_<call> = &event_<call>;
 634  *
 635  */
 636
 637 #ifdef CONFIG_PERF_EVENTS
 638
 639 #define _TRACE_PERF_PROTO(call, proto)                                  \
 640         static notrace void                                             \
 641         perf_trace_##call(void *__data, proto);
 642
 643 #define _TRACE_PERF_INIT(call)                                          \
 644         .perf_probe             = perf_trace_##call,
 645
 646 #else
 647 #define _TRACE_PERF_PROTO(call, proto)
 648 #define _TRACE_PERF_INIT(call)
 649 #endif /* CONFIG_PERF_EVENTS */
 650
 651 #undef __entry
 652 #define __entry entry
 653
 654 #undef __field
 655 #define __field(type, item)
 656
 657 #undef __field_struct
 658 #define __field_struct(type, item)
 659
 660 #undef __array
 661 #define __array(type, item, len)
 662
 663 #undef __dynamic_array
 664 #define __dynamic_array(type, item, len)                                \
 665         __entry->__data_loc_##item = __data_offsets.item;
 666
 667 #undef __string
 668 #define __string(item, src) __dynamic_array(char, item, -1)
 669
 670 #undef __assign_str
 671 #define __assign_str(dst, src)                                          \
 672         strcpy(__get_str(dst), (src) ? (const char *)(src) : "(null)");
 673
 674 #undef __bitmask
 675 #define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item, -1)
 676
 677 #undef __get_bitmask
 678 #define __get_bitmask(field) (char *)__get_dynamic_array(field)
 679
 680 #undef __assign_bitmask
 681 #define __assign_bitmask(dst, src, nr_bits)                                     \
 682         memcpy(__get_bitmask(dst), (src), __bitmask_size_in_bytes(nr_bits))
 683
 684 #undef TP_fast_assign
 685 #define TP_fast_assign(args...) args
 686
 687 #undef __perf_count
 688 #define __perf_count(c) (c)
 689
 690 #undef __perf_task
 691 #define __perf_task(t)  (t)
 692
 693 #undef DECLARE_EVENT_CLASS
 694 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 695                                                                         \
 696 static notrace void                                                     \
 697 trace_event_raw_event_##call(void *__data, proto)                       \
 698 {                                                                       \
 699         struct trace_event_file *trace_file = __data;                   \
 700         struct trace_event_data_offsets_##call __maybe_unused __data_offsets;\
 701         struct trace_event_buffer fbuffer;                              \
 702         struct trace_event_raw_##call *entry;                           \
 703         int __data_size;                                                \
 704                                                                         \
 705         if (trace_trigger_soft_disabled(trace_file))                    \
 706                 return;                                                 \
 707                                                                         \
 708         __data_size = trace_event_get_offsets_##call(&__data_offsets, args); \
 709                                                                         \
 710         entry = trace_event_buffer_reserve(&fbuffer, trace_file,        \
 711                                  sizeof(*entry) + __data_size);         \
 712                                                                         \
 713         if (!entry)                                                     \
 714                 return;                                                 \
 715                                                                         \
 716         tstruct                                                         \
 717                                                                         \
 718         { assign; }                                                     \
 719                                                                         \
 720         trace_event_buffer_commit(&fbuffer);                            \
 721 }
 722 /*
 723  * The ftrace_test_probe is compiled out, it is only here as a build time check
 724  * to make sure that if the tracepoint handling changes, the ftrace probe will
 725  * fail to compile unless it too is updated.
 726  */
 727
 728 #undef DEFINE_EVENT
 729 #define DEFINE_EVENT(template, call, proto, args)                       \
 730 static inline void ftrace_test_probe_##call(void)                       \
 731 {                                                                       \
 732         check_trace_callback_type_##call(trace_event_raw_event_##template); \
 733 }
 734
 735 #undef DEFINE_EVENT_PRINT
 736 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)
 737
 738 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 739
 740 #undef __entry
 741 #define __entry REC
 742
 743 #undef __print_flags
 744 #undef __print_symbolic
 745 #undef __print_hex
 746 #undef __print_hex_str
 747 #undef __get_dynamic_array
 748 #undef __get_dynamic_array_len
 749 #undef __get_str
 750 #undef __get_bitmask
 751 #undef __print_array
 752
 753 #undef TP_printk
 754 #define TP_printk(fmt, args...) "\"" fmt "\", "  __stringify(args)
 755
 756 #undef DECLARE_EVENT_CLASS
 757 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 758 _TRACE_PERF_PROTO(call, PARAMS(proto));                                 \
 759 static char print_fmt_##call[] = print;                                 \
 760 static struct trace_event_class __used __refdata event_class_##call = { \
 761         .system                 = TRACE_SYSTEM_STRING,                  \
 762         .define_fields          = trace_event_define_fields_##call,     \
 763         .fields                 = LIST_HEAD_INIT(event_class_##call.fields),\
 764         .raw_init               = trace_event_raw_init,                 \
 765         .probe                  = trace_event_raw_event_##call,         \
 766         .reg                    = trace_event_reg,                      \
 767         _TRACE_PERF_INIT(call)                                          \
 768 };
 769
 770 #undef DEFINE_EVENT
 771 #define DEFINE_EVENT(template, call, proto, args)                       \
 772                                                                         \
 773 static struct trace_event_call __used event_##call = {                  \
 774         .class                  = &event_class_##template,              \
 775         {                                                               \
 776                 .tp                     = &__tracepoint_##call,         \
 777         },                                                              \
 778         .event.funcs            = &trace_event_type_funcs_##template,   \
 779         .print_fmt              = print_fmt_##template,                 \
 780         .flags                  = TRACE_EVENT_FL_TRACEPOINT,            \
 781 };                                                                      \
 782 static struct trace_event_call __used                                   \
 783 __attribute__((section("_ftrace_events"))) *__event_##call = &event_##call
 784
 785 #undef DEFINE_EVENT_PRINT
 786 #define DEFINE_EVENT_PRINT(template, call, proto, args, print)          \
 787                                                                         \
 788 static char print_fmt_##call[] = print;                                 \
 789                                                                         \
 790 static struct trace_event_call __used event_##call = {                  \
 791         .class                  = &event_class_##template,              \
 792         {                                                               \
 793                 .tp                     = &__tracepoint_##call,         \
 794         },                                                              \
 795         .event.funcs            = &trace_event_type_funcs_##call,       \
 796         .print_fmt              = print_fmt_##call,                     \
 797         .flags                  = TRACE_EVENT_FL_TRACEPOINT,            \
 798 };                                                                      \
 799 static struct trace_event_call __used                                   \
 800 __attribute__((section("_ftrace_events"))) *__event_##call = &event_##call
 801
 802 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)