include/trace/trace_events.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Stage 1 of the trace events.
   4  *
   5  * Override the macros in the event tracepoint header <trace/events/XXX.h>
   6  * to include the following:
   7  *
   8  * struct trace_event_raw_<call> {
   9  *      struct trace_entry              ent;
  10  *      <type>                          <item>;
  11  *      <type2>                         <item2>[<len>];
  12  *      [...]
  13  * };
  14  *
  15  * The <type> <item> is created by the __field(type, item) macro or
  16  * the __array(type2, item2, len) macro.
  17  * We simply do "type item;", and that will create the fields
  18  * in the structure.
  19  */
  20
  21 #include <linux/trace_events.h>
  22
  23 #ifndef TRACE_SYSTEM_VAR
  24 #define TRACE_SYSTEM_VAR TRACE_SYSTEM
  25 #endif
  26
  27 #define __app__(x, y) str__##x##y
  28 #define __app(x, y) __app__(x, y)
  29
  30 #define TRACE_SYSTEM_STRING __app(TRACE_SYSTEM_VAR,__trace_system_name)
  31
  32 #define TRACE_MAKE_SYSTEM_STR()                         \
  33         static const char TRACE_SYSTEM_STRING[] =       \
  34                 __stringify(TRACE_SYSTEM)
  35
  36 TRACE_MAKE_SYSTEM_STR();
  37
  38 #undef TRACE_DEFINE_ENUM
  39 #define TRACE_DEFINE_ENUM(a)                            \
  40         static struct trace_eval_map __used __initdata  \
  41         __##TRACE_SYSTEM##_##a =                        \
  42         {                                               \
  43                 .system = TRACE_SYSTEM_STRING,          \
  44                 .eval_string = #a,                      \
  45                 .eval_value = a                         \
  46         };                                              \
  47         static struct trace_eval_map __used             \
  48         __attribute__((section("_ftrace_eval_map")))    \
  49         *TRACE_SYSTEM##_##a = &__##TRACE_SYSTEM##_##a
  50
  51 #undef TRACE_DEFINE_SIZEOF
  52 #define TRACE_DEFINE_SIZEOF(a)                          \
  53         static struct trace_eval_map __used __initdata  \
  54         __##TRACE_SYSTEM##_##a =                        \
  55         {                                               \
  56                 .system = TRACE_SYSTEM_STRING,          \
  57                 .eval_string = "sizeof(" #a ")",        \
  58                 .eval_value = sizeof(a)                 \
  59         };                                              \
  60         static struct trace_eval_map __used             \
  61         __attribute__((section("_ftrace_eval_map")))    \
  62         *TRACE_SYSTEM##_##a = &__##TRACE_SYSTEM##_##a
  63
  64 /*
  65  * DECLARE_EVENT_CLASS can be used to add a generic function
  66  * handlers for events. That is, if all events have the same
  67  * parameters and just have distinct trace points.
  68  * Each tracepoint can be defined with DEFINE_EVENT and that
  69  * will map the DECLARE_EVENT_CLASS to the tracepoint.
  70  *
  71  * TRACE_EVENT is a one to one mapping between tracepoint and template.
  72  */
  73 #undef TRACE_EVENT
  74 #define TRACE_EVENT(name, proto, args, tstruct, assign, print) \
  75         DECLARE_EVENT_CLASS(name,                              \
  76                              PARAMS(proto),                    \
  77                              PARAMS(args),                     \
  78                              PARAMS(tstruct),                  \
  79                              PARAMS(assign),                   \
  80                              PARAMS(print));                   \
  81         DEFINE_EVENT(name, name, PARAMS(proto), PARAMS(args));
  82
  83
  84 #undef __field
  85 #define __field(type, item)             type    item;
  86
  87 #undef __field_ext
  88 #define __field_ext(type, item, filter_type)    type    item;
  89
  90 #undef __field_struct
  91 #define __field_struct(type, item)      type    item;
  92
  93 #undef __field_struct_ext
  94 #define __field_struct_ext(type, item, filter_type)     type    item;
  95
  96 #undef __array
  97 #define __array(type, item, len)        type    item[len];
  98
  99 #undef __dynamic_array
 100 #define __dynamic_array(type, item, len) u32 __data_loc_##item;
 101
 102 #undef __string
 103 #define __string(item, src) __dynamic_array(char, item, -1)
 104
 105 #undef __bitmask
 106 #define __bitmask(item, nr_bits) __dynamic_array(char, item, -1)
 107
 108 #undef TP_STRUCT__entry
 109 #define TP_STRUCT__entry(args...) args
 110
 111 #undef DECLARE_EVENT_CLASS
 112 #define DECLARE_EVENT_CLASS(name, proto, args, tstruct, assign, print)  \
 113         struct trace_event_raw_##name {                                 \
 114                 struct trace_entry      ent;                            \
 115                 tstruct                                                 \
 116                 char                    __data[0];                      \
 117         };                                                              \
 118                                                                         \
 119         static struct trace_event_class event_class_##name;
 120
 121 #undef DEFINE_EVENT
 122 #define DEFINE_EVENT(template, name, proto, args)       \
 123         static struct trace_event_call  __used          \
 124         __attribute__((__aligned__(4))) event_##name
 125
 126 #undef DEFINE_EVENT_FN
 127 #define DEFINE_EVENT_FN(template, name, proto, args, reg, unreg)        \
 128         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 129
 130 #undef DEFINE_EVENT_PRINT
 131 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
 132         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 133
 134 /* Callbacks are meaningless to ftrace. */
 135 #undef TRACE_EVENT_FN
 136 #define TRACE_EVENT_FN(name, proto, args, tstruct,                      \
 137                 assign, print, reg, unreg)                              \
 138         TRACE_EVENT(name, PARAMS(proto), PARAMS(args),                  \
 139                 PARAMS(tstruct), PARAMS(assign), PARAMS(print))         \
 140
 141 #undef TRACE_EVENT_FN_COND
 142 #define TRACE_EVENT_FN_COND(name, proto, args, cond, tstruct,   \
 143                 assign, print, reg, unreg)                              \
 144         TRACE_EVENT_CONDITION(name, PARAMS(proto), PARAMS(args), PARAMS(cond),          \
 145                 PARAMS(tstruct), PARAMS(assign), PARAMS(print))         \
 146
 147 #undef TRACE_EVENT_FLAGS
 148 #define TRACE_EVENT_FLAGS(name, value)                                  \
 149         __TRACE_EVENT_FLAGS(name, value)
 150
 151 #undef TRACE_EVENT_PERF_PERM
 152 #define TRACE_EVENT_PERF_PERM(name, expr...)                            \
 153         __TRACE_EVENT_PERF_PERM(name, expr)
 154
 155 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 156
 157 /*
 158  * Stage 2 of the trace events.
 159  *
 160  * Include the following:
 161  *
 162  * struct trace_event_data_offsets_<call> {
 163  *      u32                             <item1>;
 164  *      u32                             <item2>;
 165  *      [...]
 166  * };
 167  *
 168  * The __dynamic_array() macro will create each u32 <item>, this is
 169  * to keep the offset of each array from the beginning of the event.
 170  * The size of an array is also encoded, in the higher 16 bits of <item>.
 171  */
 172
 173 #undef TRACE_DEFINE_ENUM
 174 #define TRACE_DEFINE_ENUM(a)
 175
 176 #undef TRACE_DEFINE_SIZEOF
 177 #define TRACE_DEFINE_SIZEOF(a)
 178
 179 #undef __field
 180 #define __field(type, item)
 181
 182 #undef __field_ext
 183 #define __field_ext(type, item, filter_type)
 184
 185 #undef __field_struct
 186 #define __field_struct(type, item)
 187
 188 #undef __field_struct_ext
 189 #define __field_struct_ext(type, item, filter_type)
 190
 191 #undef __array
 192 #define __array(type, item, len)
 193
 194 #undef __dynamic_array
 195 #define __dynamic_array(type, item, len)        u32 item;
 196
 197 #undef __string
 198 #define __string(item, src) __dynamic_array(char, item, -1)
 199
 200 #undef __bitmask
 201 #define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item, -1)
 202
 203 #undef DECLARE_EVENT_CLASS
 204 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 205         struct trace_event_data_offsets_##call {                        \
 206                 tstruct;                                                \
 207         };
 208
 209 #undef DEFINE_EVENT
 210 #define DEFINE_EVENT(template, name, proto, args)
 211
 212 #undef DEFINE_EVENT_PRINT
 213 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
 214         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 215
 216 #undef TRACE_EVENT_FLAGS
 217 #define TRACE_EVENT_FLAGS(event, flag)
 218
 219 #undef TRACE_EVENT_PERF_PERM
 220 #define TRACE_EVENT_PERF_PERM(event, expr...)
 221
 222 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 223
 224 /*
 225  * Stage 3 of the trace events.
 226  *
 227  * Override the macros in the event tracepoint header <trace/events/XXX.h>
 228  * to include the following:
 229  *
 230  * enum print_line_t
 231  * trace_raw_output_<call>(struct trace_iterator *iter, int flags)
 232  * {
 233  *      struct trace_seq *s = &iter->seq;
 234  *      struct trace_event_raw_<call> *field; <-- defined in stage 1
 235  *      struct trace_entry *entry;
 236  *      struct trace_seq *p = &iter->tmp_seq;
 237  *      int ret;
 238  *
 239  *      entry = iter->ent;
 240  *
 241  *      if (entry->type != event_<call>->event.type) {
 242  *              WARN_ON_ONCE(1);
 243  *              return TRACE_TYPE_UNHANDLED;
 244  *      }
 245  *
 246  *      field = (typeof(field))entry;
 247  *
 248  *      trace_seq_init(p);
 249  *      ret = trace_seq_printf(s, "%s: ", <call>);
 250  *      if (ret)
 251  *              ret = trace_seq_printf(s, <TP_printk> "\n");
 252  *      if (!ret)
 253  *              return TRACE_TYPE_PARTIAL_LINE;
 254  *
 255  *      return TRACE_TYPE_HANDLED;
 256  * }
 257  *
 258  * This is the method used to print the raw event to the trace
 259  * output format. Note, this is not needed if the data is read
 260  * in binary.
 261  */
 262
 263 #undef __entry
 264 #define __entry field
 265
 266 #undef TP_printk
 267 #define TP_printk(fmt, args...) fmt "\n", args
 268
 269 #undef __get_dynamic_array
 270 #define __get_dynamic_array(field)      \
 271                 ((void *)__entry + (__entry->__data_loc_##field & 0xffff))
 272
 273 #undef __get_dynamic_array_len
 274 #define __get_dynamic_array_len(field)  \
 275                 ((__entry->__data_loc_##field >> 16) & 0xffff)
 276
 277 #undef __get_str
 278 #define __get_str(field) ((char *)__get_dynamic_array(field))
 279
 280 #undef __get_bitmask
 281 #define __get_bitmask(field)                                            \
 282         ({                                                              \
 283                 void *__bitmask = __get_dynamic_array(field);           \
 284                 unsigned int __bitmask_size;                            \
 285                 __bitmask_size = __get_dynamic_array_len(field);        \
 286                 trace_print_bitmask_seq(p, __bitmask, __bitmask_size);  \
 287         })
 288
 289 #undef __print_flags
 290 #define __print_flags(flag, delim, flag_array...)                       \
 291         ({                                                              \
 292                 static const struct trace_print_flags __flags[] =       \
 293                         { flag_array, { -1, NULL }};                    \
 294                 trace_print_flags_seq(p, delim, flag, __flags); \
 295         })
 296
 297 #undef __print_symbolic
 298 #define __print_symbolic(value, symbol_array...)                        \
 299         ({                                                              \
 300                 static const struct trace_print_flags symbols[] =       \
 301                         { symbol_array, { -1, NULL }};                  \
 302                 trace_print_symbols_seq(p, value, symbols);             \
 303         })
 304
 305 #undef __print_flags_u64
 306 #undef __print_symbolic_u64
 307 #if BITS_PER_LONG == 32
 308 #define __print_flags_u64(flag, delim, flag_array...)                   \
 309         ({                                                              \
 310                 static const struct trace_print_flags_u64 __flags[] =   \
 311                         { flag_array, { -1, NULL } };                   \
 312                 trace_print_flags_seq_u64(p, delim, flag, __flags);     \
 313         })
 314
 315 #define __print_symbolic_u64(value, symbol_array...)                    \
 316         ({                                                              \
 317                 static const struct trace_print_flags_u64 symbols[] =   \
 318                         { symbol_array, { -1, NULL } };                 \
 319                 trace_print_symbols_seq_u64(p, value, symbols); \
 320         })
 321 #else
 322 #define __print_flags_u64(flag, delim, flag_array...)                   \
 323                         __print_flags(flag, delim, flag_array)
 324
 325 #define __print_symbolic_u64(value, symbol_array...)                    \
 326                         __print_symbolic(value, symbol_array)
 327 #endif
 328
 329 #undef __print_hex
 330 #define __print_hex(buf, buf_len)                                       \
 331         trace_print_hex_seq(p, buf, buf_len, false)
 332
 333 #undef __print_hex_str
 334 #define __print_hex_str(buf, buf_len)                                   \
 335         trace_print_hex_seq(p, buf, buf_len, true)
 336
 337 #undef __print_array
 338 #define __print_array(array, count, el_size)                            \
 339         ({                                                              \
 340                 BUILD_BUG_ON(el_size != 1 && el_size != 2 &&            \
 341                              el_size != 4 && el_size != 8);             \
 342                 trace_print_array_seq(p, array, count, el_size);        \
 343         })
 344
 345 #undef __print_hex_dump
 346 #define __print_hex_dump(prefix_str, prefix_type,                       \
 347                          rowsize, groupsize, buf, len, ascii)           \
 348         trace_print_hex_dump_seq(p, prefix_str, prefix_type,            \
 349                                  rowsize, groupsize, buf, len, ascii)
 350
 351 #undef DECLARE_EVENT_CLASS
 352 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 353 static notrace enum print_line_t                                        \
 354 trace_raw_output_##call(struct trace_iterator *iter, int flags,         \
 355                         struct trace_event *trace_event)                \
 356 {                                                                       \
 357         struct trace_seq *s = &iter->seq;                               \
 358         struct trace_seq __maybe_unused *p = &iter->tmp_seq;            \
 359         struct trace_event_raw_##call *field;                           \
 360         int ret;                                                        \
 361                                                                         \
 362         field = (typeof(field))iter->ent;                               \
 363                                                                         \
 364         ret = trace_raw_output_prep(iter, trace_event);                 \
 365         if (ret != TRACE_TYPE_HANDLED)                                  \
 366                 return ret;                                             \
 367                                                                         \
 368         trace_seq_printf(s, print);                                     \
 369                                                                         \
 370         return trace_handle_return(s);                                  \
 371 }                                                                       \
 372 static struct trace_event_functions trace_event_type_funcs_##call = {   \
 373         .trace                  = trace_raw_output_##call,              \
 374 };
 375
 376 #undef DEFINE_EVENT_PRINT
 377 #define DEFINE_EVENT_PRINT(template, call, proto, args, print)          \
 378 static notrace enum print_line_t                                        \
 379 trace_raw_output_##call(struct trace_iterator *iter, int flags,         \
 380                          struct trace_event *event)                     \
 381 {                                                                       \
 382         struct trace_event_raw_##template *field;                       \
 383         struct trace_entry *entry;                                      \
 384         struct trace_seq *p = &iter->tmp_seq;                           \
 385                                                                         \
 386         entry = iter->ent;                                              \
 387                                                                         \
 388         if (entry->type != event_##call.event.type) {                   \
 389                 WARN_ON_ONCE(1);                                        \
 390                 return TRACE_TYPE_UNHANDLED;                            \
 391         }                                                               \
 392                                                                         \
 393         field = (typeof(field))entry;                                   \
 394                                                                         \
 395         trace_seq_init(p);                                              \
 396         return trace_output_call(iter, #call, print);                   \
 397 }                                                                       \
 398 static struct trace_event_functions trace_event_type_funcs_##call = {   \
 399         .trace                  = trace_raw_output_##call,              \
 400 };
 401
 402 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 403
 404 #undef __field_ext
 405 #define __field_ext(_type, _item, _filter_type) {                       \
 406         .type = #_type, .name = #_item,                                 \
 407         .size = sizeof(_type), .align = __alignof__(_type),             \
 408         .is_signed = is_signed_type(_type), .filter_type = _filter_type },
 409
 410 #undef __field_struct_ext
 411 #define __field_struct_ext(_type, _item, _filter_type) {                \
 412         .type = #_type, .name = #_item,                                 \
 413         .size = sizeof(_type), .align = __alignof__(_type),             \
 414         0, .filter_type = _filter_type },
 415
 416 #undef __field
 417 #define __field(type, item)     __field_ext(type, item, FILTER_OTHER)
 418
 419 #undef __field_struct
 420 #define __field_struct(type, item) __field_struct_ext(type, item, FILTER_OTHER)
 421
 422 #undef __array
 423 #define __array(_type, _item, _len) {                                   \
 424         .type = #_type"["__stringify(_len)"]", .name = #_item,          \
 425         .size = sizeof(_type[_len]), .align = __alignof__(_type),       \
 426         .is_signed = is_signed_type(_type), .filter_type = FILTER_OTHER },
 427
 428 #undef __dynamic_array
 429 #define __dynamic_array(_type, _item, _len) {                           \
 430         .type = "__data_loc " #_type "[]", .name = #_item,              \
 431         .size = 4, .align = 4,                                          \
 432         .is_signed = is_signed_type(_type), .filter_type = FILTER_OTHER },
 433
 434 #undef __string
 435 #define __string(item, src) __dynamic_array(char, item, -1)
 436
 437 #undef __bitmask
 438 #define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item, -1)
 439
 440 #undef DECLARE_EVENT_CLASS
 441 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, func, print)    \
 442 static struct trace_event_fields trace_event_fields_##call[] = {        \
 443         tstruct                                                         \
 444         {} };
 445
 446 #undef DEFINE_EVENT
 447 #define DEFINE_EVENT(template, name, proto, args)
 448
 449 #undef DEFINE_EVENT_PRINT
 450 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
 451         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 452
 453 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 454
 455 /*
 456  * remember the offset of each array from the beginning of the event.
 457  */
 458
 459 #undef __entry
 460 #define __entry entry
 461
 462 #undef __field
 463 #define __field(type, item)
 464
 465 #undef __field_ext
 466 #define __field_ext(type, item, filter_type)
 467
 468 #undef __field_struct
 469 #define __field_struct(type, item)
 470
 471 #undef __field_struct_ext
 472 #define __field_struct_ext(type, item, filter_type)
 473
 474 #undef __array
 475 #define __array(type, item, len)
 476
 477 #undef __dynamic_array
 478 #define __dynamic_array(type, item, len)                                \
 479         __item_length = (len) * sizeof(type);                           \
 480         __data_offsets->item = __data_size +                            \
 481                                offsetof(typeof(*entry), __data);        \
 482         __data_offsets->item |= __item_length << 16;                    \
 483         __data_size += __item_length;
 484
 485 #undef __string
 486 #define __string(item, src) __dynamic_array(char, item,                 \
 487                     strlen((src) ? (const char *)(src) : "(null)") + 1)
 488
 489 /*
 490  * __bitmask_size_in_bytes_raw is the number of bytes needed to hold
 491  * num_possible_cpus().
 492  */
 493 #define __bitmask_size_in_bytes_raw(nr_bits)    \
 494         (((nr_bits) + 7) / 8)
 495
 496 #define __bitmask_size_in_longs(nr_bits)                        \
 497         ((__bitmask_size_in_bytes_raw(nr_bits) +                \
 498           ((BITS_PER_LONG / 8) - 1)) / (BITS_PER_LONG / 8))
 499
 500 /*
 501  * __bitmask_size_in_bytes is the number of bytes needed to hold
 502  * num_possible_cpus() padded out to the nearest long. This is what
 503  * is saved in the buffer, just to be consistent.
 504  */
 505 #define __bitmask_size_in_bytes(nr_bits)                                \
 506         (__bitmask_size_in_longs(nr_bits) * (BITS_PER_LONG / 8))
 507
 508 #undef __bitmask
 509 #define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item,   \
 510                                          __bitmask_size_in_longs(nr_bits))
 511
 512 #undef DECLARE_EVENT_CLASS
 513 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 514 static inline notrace int trace_event_get_offsets_##call(               \
 515         struct trace_event_data_offsets_##call *__data_offsets, proto)  \
 516 {                                                                       \
 517         int __data_size = 0;                                            \
 518         int __maybe_unused __item_length;                               \
 519         struct trace_event_raw_##call __maybe_unused *entry;            \
 520                                                                         \
 521         tstruct;                                                        \
 522                                                                         \
 523         return __data_size;                                             \
 524 }
 525
 526 #undef DEFINE_EVENT
 527 #define DEFINE_EVENT(template, name, proto, args)
 528
 529 #undef DEFINE_EVENT_PRINT
 530 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
 531         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 532
 533 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 534
 535 /*
 536  * Stage 4 of the trace events.
 537  *
 538  * Override the macros in the event tracepoint header <trace/events/XXX.h>
 539  * to include the following:
 540  *
 541  * For those macros defined with TRACE_EVENT:
 542  *
 543  * static struct trace_event_call event_<call>;
 544  *
 545  * static void trace_event_raw_event_<call>(void *__data, proto)
 546  * {
 547  *      struct trace_event_file *trace_file = __data;
 548  *      struct trace_event_call *event_call = trace_file->event_call;
 549  *      struct trace_event_data_offsets_<call> __maybe_unused __data_offsets;
 550  *      unsigned long eflags = trace_file->flags;
 551  *      enum event_trigger_type __tt = ETT_NONE;
 552  *      struct ring_buffer_event *event;
 553  *      struct trace_event_raw_<call> *entry; <-- defined in stage 1
 554  *      struct trace_buffer *buffer;
 555  *      unsigned long irq_flags;
 556  *      int __data_size;
 557  *      int pc;
 558  *
 559  *      if (!(eflags & EVENT_FILE_FL_TRIGGER_COND)) {
 560  *              if (eflags & EVENT_FILE_FL_TRIGGER_MODE)
 561  *                      event_triggers_call(trace_file, NULL);
 562  *              if (eflags & EVENT_FILE_FL_SOFT_DISABLED)
 563  *                      return;
 564  *      }
 565  *
 566  *      local_save_flags(irq_flags);
 567  *      pc = preempt_count();
 568  *
 569  *      __data_size = trace_event_get_offsets_<call>(&__data_offsets, args);
 570  *
 571  *      event = trace_event_buffer_lock_reserve(&buffer, trace_file,
 572  *                                event_<call>->event.type,
 573  *                                sizeof(*entry) + __data_size,
 574  *                                irq_flags, pc);
 575  *      if (!event)
 576  *              return;
 577  *      entry   = ring_buffer_event_data(event);
 578  *
 579  *      { <assign>; }  <-- Here we assign the entries by the __field and
 580  *                         __array macros.
 581  *
 582  *      if (eflags & EVENT_FILE_FL_TRIGGER_COND)
 583  *              __tt = event_triggers_call(trace_file, entry);
 584  *
 585  *      if (test_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT,
 586  *                   &trace_file->flags))
 587  *              ring_buffer_discard_commit(buffer, event);
 588  *      else if (!filter_check_discard(trace_file, entry, buffer, event))
 589  *              trace_buffer_unlock_commit(buffer, event, irq_flags, pc);
 590  *
 591  *      if (__tt)
 592  *              event_triggers_post_call(trace_file, __tt);
 593  * }
 594  *
 595  * static struct trace_event ftrace_event_type_<call> = {
 596  *      .trace                  = trace_raw_output_<call>, <-- stage 2
 597  * };
 598  *
 599  * static char print_fmt_<call>[] = <TP_printk>;
 600  *
 601  * static struct trace_event_class __used event_class_<template> = {
 602  *      .system                 = "<system>",
 603  *      .fields_array           = trace_event_fields_<call>,
 604  *      .fields                 = LIST_HEAD_INIT(event_class_##call.fields),
 605  *      .raw_init               = trace_event_raw_init,
 606  *      .probe                  = trace_event_raw_event_##call,
 607  *      .reg                    = trace_event_reg,
 608  * };
 609  *
 610  * static struct trace_event_call event_<call> = {
 611  *      .class                  = event_class_<template>,
 612  *      {
 613  *              .tp                     = &__tracepoint_<call>,
 614  *      },
 615  *      .event                  = &ftrace_event_type_<call>,
 616  *      .print_fmt              = print_fmt_<call>,
 617  *      .flags                  = TRACE_EVENT_FL_TRACEPOINT,
 618  * };
 619  * // its only safe to use pointers when doing linker tricks to
 620  * // create an array.
 621  * static struct trace_event_call __used
 622  * __attribute__((section("_ftrace_events"))) *__event_<call> = &event_<call>;
 623  *
 624  */
 625
 626 #ifdef CONFIG_PERF_EVENTS
 627
 628 #define _TRACE_PERF_PROTO(call, proto)                                  \
 629         static notrace void                                             \
 630         perf_trace_##call(void *__data, proto);
 631
 632 #define _TRACE_PERF_INIT(call)                                          \
 633         .perf_probe             = perf_trace_##call,
 634
 635 #else
 636 #define _TRACE_PERF_PROTO(call, proto)
 637 #define _TRACE_PERF_INIT(call)
 638 #endif /* CONFIG_PERF_EVENTS */
 639
 640 #undef __entry
 641 #define __entry entry
 642
 643 #undef __field
 644 #define __field(type, item)
 645
 646 #undef __field_struct
 647 #define __field_struct(type, item)
 648
 649 #undef __array
 650 #define __array(type, item, len)
 651
 652 #undef __dynamic_array
 653 #define __dynamic_array(type, item, len)                                \
 654         __entry->__data_loc_##item = __data_offsets.item;
 655
 656 #undef __string
 657 #define __string(item, src) __dynamic_array(char, item, -1)
 658
 659 #undef __assign_str
 660 #define __assign_str(dst, src)                                          \
 661         strcpy(__get_str(dst), (src) ? (const char *)(src) : "(null)");
 662
 663 #undef __bitmask
 664 #define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item, -1)
 665
 666 #undef __get_bitmask
 667 #define __get_bitmask(field) (char *)__get_dynamic_array(field)
 668
 669 #undef __assign_bitmask
 670 #define __assign_bitmask(dst, src, nr_bits)                                     \
 671         memcpy(__get_bitmask(dst), (src), __bitmask_size_in_bytes(nr_bits))
 672
 673 #undef TP_fast_assign
 674 #define TP_fast_assign(args...) args
 675
 676 #undef __perf_count
 677 #define __perf_count(c) (c)
 678
 679 #undef __perf_task
 680 #define __perf_task(t)  (t)
 681
 682 #undef DECLARE_EVENT_CLASS
 683 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 684                                                                         \
 685 static notrace void                                                     \
 686 trace_event_raw_event_##call(void *__data, proto)                       \
 687 {                                                                       \
 688         struct trace_event_file *trace_file = __data;                   \
 689         struct trace_event_data_offsets_##call __maybe_unused __data_offsets;\
 690         struct trace_event_buffer fbuffer;                              \
 691         struct trace_event_raw_##call *entry;                           \
 692         int __data_size;                                                \
 693                                                                         \
 694         if (trace_trigger_soft_disabled(trace_file))                    \
 695                 return;                                                 \
 696                                                                         \
 697         __data_size = trace_event_get_offsets_##call(&__data_offsets, args); \
 698                                                                         \
 699         entry = trace_event_buffer_reserve(&fbuffer, trace_file,        \
 700                                  sizeof(*entry) + __data_size);         \
 701                                                                         \
 702         if (!entry)                                                     \
 703                 return;                                                 \
 704                                                                         \
 705         tstruct                                                         \
 706                                                                         \
 707         { assign; }                                                     \
 708                                                                         \
 709         trace_event_buffer_commit(&fbuffer);                            \
 710 }
 711 /*
 712  * The ftrace_test_probe is compiled out, it is only here as a build time check
 713  * to make sure that if the tracepoint handling changes, the ftrace probe will
 714  * fail to compile unless it too is updated.
 715  */
 716
 717 #undef DEFINE_EVENT
 718 #define DEFINE_EVENT(template, call, proto, args)                       \
 719 static inline void ftrace_test_probe_##call(void)                       \
 720 {                                                                       \
 721         check_trace_callback_type_##call(trace_event_raw_event_##template); \
 722 }
 723
 724 #undef DEFINE_EVENT_PRINT
 725 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)
 726
 727 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 728
 729 #undef __entry
 730 #define __entry REC
 731
 732 #undef __print_flags
 733 #undef __print_symbolic
 734 #undef __print_hex
 735 #undef __print_hex_str
 736 #undef __get_dynamic_array
 737 #undef __get_dynamic_array_len
 738 #undef __get_str
 739 #undef __get_bitmask
 740 #undef __print_array
 741 #undef __print_hex_dump
 742
 743 #undef TP_printk
 744 #define TP_printk(fmt, args...) "\"" fmt "\", "  __stringify(args)
 745
 746 #undef DECLARE_EVENT_CLASS
 747 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 748 _TRACE_PERF_PROTO(call, PARAMS(proto));                                 \
 749 static char print_fmt_##call[] = print;                                 \
 750 static struct trace_event_class __used __refdata event_class_##call = { \
 751         .system                 = TRACE_SYSTEM_STRING,                  \
 752         .fields_array           = trace_event_fields_##call,            \
 753         .fields                 = LIST_HEAD_INIT(event_class_##call.fields),\
 754         .raw_init               = trace_event_raw_init,                 \
 755         .probe                  = trace_event_raw_event_##call,         \
 756         .reg                    = trace_event_reg,                      \
 757         _TRACE_PERF_INIT(call)                                          \
 758 };
 759
 760 #undef DEFINE_EVENT
 761 #define DEFINE_EVENT(template, call, proto, args)                       \
 762                                                                         \
 763 static struct trace_event_call __used event_##call = {                  \
 764         .class                  = &event_class_##template,              \
 765         {                                                               \
 766                 .tp                     = &__tracepoint_##call,         \
 767         },                                                              \
 768         .event.funcs            = &trace_event_type_funcs_##template,   \
 769         .print_fmt              = print_fmt_##template,                 \
 770         .flags                  = TRACE_EVENT_FL_TRACEPOINT,            \
 771 };                                                                      \
 772 static struct trace_event_call __used                                   \
 773 __attribute__((section("_ftrace_events"))) *__event_##call = &event_##call
 774
 775 #undef DEFINE_EVENT_PRINT
 776 #define DEFINE_EVENT_PRINT(template, call, proto, args, print)          \
 777                                                                         \
 778 static char print_fmt_##call[] = print;                                 \
 779                                                                         \
 780 static struct trace_event_call __used event_##call = {                  \
 781         .class                  = &event_class_##template,              \
 782         {                                                               \
 783                 .tp                     = &__tracepoint_##call,         \
 784         },                                                              \
 785         .event.funcs            = &trace_event_type_funcs_##call,       \
 786         .print_fmt              = print_fmt_##call,                     \
 787         .flags                  = TRACE_EVENT_FL_TRACEPOINT,            \
 788 };                                                                      \
 789 static struct trace_event_call __used                                   \
 790 __attribute__((section("_ftrace_events"))) *__event_##call = &event_##call
 791
 792 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)