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 <trace/trace_events.h> to include the following:
   6  *
   7  * struct trace_event_raw_<call> {
   8  *      struct trace_entry              ent;
   9  *      <type>                          <item>;
  10  *      <type2>                         <item2>[<len>];
  11  *      [...]
  12  * };
  13  *
  14  * The <type> <item> is created by the __field(type, item) macro or
  15  * the __array(type2, item2, len) macro.
  16  * We simply do "type item;", and that will create the fields
  17  * in the structure.
  18  */
  19
  20 #include <linux/trace_events.h>
  21
  22 #ifndef TRACE_SYSTEM_VAR
  23 #define TRACE_SYSTEM_VAR TRACE_SYSTEM
  24 #endif
  25
  26 #define __app__(x, y) str__##x##y
  27 #define __app(x, y) __app__(x, y)
  28
  29 #define TRACE_SYSTEM_STRING __app(TRACE_SYSTEM_VAR,__trace_system_name)
  30
  31 #define TRACE_MAKE_SYSTEM_STR()                         \
  32         static const char TRACE_SYSTEM_STRING[] =       \
  33                 __stringify(TRACE_SYSTEM)
  34
  35 TRACE_MAKE_SYSTEM_STR();
  36
  37 #undef TRACE_DEFINE_ENUM
  38 #define TRACE_DEFINE_ENUM(a)                            \
  39         static struct trace_eval_map __used __initdata  \
  40         __##TRACE_SYSTEM##_##a =                        \
  41         {                                               \
  42                 .system = TRACE_SYSTEM_STRING,          \
  43                 .eval_string = #a,                      \
  44                 .eval_value = a                         \
  45         };                                              \
  46         static struct trace_eval_map __used             \
  47         __attribute__((section("_ftrace_eval_map")))    \
  48         *TRACE_SYSTEM##_##a = &__##TRACE_SYSTEM##_##a
  49
  50 #undef TRACE_DEFINE_SIZEOF
  51 #define TRACE_DEFINE_SIZEOF(a)                          \
  52         static struct trace_eval_map __used __initdata  \
  53         __##TRACE_SYSTEM##_##a =                        \
  54         {                                               \
  55                 .system = TRACE_SYSTEM_STRING,          \
  56                 .eval_string = "sizeof(" #a ")",        \
  57                 .eval_value = sizeof(a)                 \
  58         };                                              \
  59         static struct trace_eval_map __used             \
  60         __attribute__((section("_ftrace_eval_map")))    \
  61         *TRACE_SYSTEM##_##a = &__##TRACE_SYSTEM##_##a
  62
  63 /*
  64  * DECLARE_EVENT_CLASS can be used to add a generic function
  65  * handlers for events. That is, if all events have the same
  66  * parameters and just have distinct trace points.
  67  * Each tracepoint can be defined with DEFINE_EVENT and that
  68  * will map the DECLARE_EVENT_CLASS to the tracepoint.
  69  *
  70  * TRACE_EVENT is a one to one mapping between tracepoint and template.
  71  */
  72 #undef TRACE_EVENT
  73 #define TRACE_EVENT(name, proto, args, tstruct, assign, print) \
  74         DECLARE_EVENT_CLASS(name,                              \
  75                              PARAMS(proto),                    \
  76                              PARAMS(args),                     \
  77                              PARAMS(tstruct),                  \
  78                              PARAMS(assign),                   \
  79                              PARAMS(print));                   \
  80         DEFINE_EVENT(name, name, PARAMS(proto), PARAMS(args));
  81
  82
  83 #undef __field
  84 #define __field(type, item)             type    item;
  85
  86 #undef __field_ext
  87 #define __field_ext(type, item, filter_type)    type    item;
  88
  89 #undef __field_struct
  90 #define __field_struct(type, item)      type    item;
  91
  92 #undef __field_struct_ext
  93 #define __field_struct_ext(type, item, filter_type)     type    item;
  94
  95 #undef __array
  96 #define __array(type, item, len)        type    item[len];
  97
  98 #undef __dynamic_array
  99 #define __dynamic_array(type, item, len) u32 __data_loc_##item;
 100
 101 #undef __string
 102 #define __string(item, src) __dynamic_array(char, item, -1)
 103
 104 #undef __bitmask
 105 #define __bitmask(item, nr_bits) __dynamic_array(char, item, -1)
 106
 107 #undef TP_STRUCT__entry
 108 #define TP_STRUCT__entry(args...) args
 109
 110 #undef DECLARE_EVENT_CLASS
 111 #define DECLARE_EVENT_CLASS(name, proto, args, tstruct, assign, print)  \
 112         struct trace_event_raw_##name {                                 \
 113                 struct trace_entry      ent;                            \
 114                 tstruct                                                 \
 115                 char                    __data[0];                      \
 116         };                                                              \
 117                                                                         \
 118         static struct trace_event_class event_class_##name;
 119
 120 #undef DEFINE_EVENT
 121 #define DEFINE_EVENT(template, name, proto, args)       \
 122         static struct trace_event_call  __used          \
 123         __attribute__((__aligned__(4))) event_##name
 124
 125 #undef DEFINE_EVENT_FN
 126 #define DEFINE_EVENT_FN(template, name, proto, args, reg, unreg)        \
 127         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 128
 129 #undef DEFINE_EVENT_PRINT
 130 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
 131         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 132
 133 /* Callbacks are meaningless to ftrace. */
 134 #undef TRACE_EVENT_FN
 135 #define TRACE_EVENT_FN(name, proto, args, tstruct,                      \
 136                 assign, print, reg, unreg)                              \
 137         TRACE_EVENT(name, PARAMS(proto), PARAMS(args),                  \
 138                 PARAMS(tstruct), PARAMS(assign), PARAMS(print))         \
 139
 140 #undef TRACE_EVENT_FN_COND
 141 #define TRACE_EVENT_FN_COND(name, proto, args, cond, tstruct,   \
 142                 assign, print, reg, unreg)                              \
 143         TRACE_EVENT_CONDITION(name, PARAMS(proto), PARAMS(args), PARAMS(cond),          \
 144                 PARAMS(tstruct), PARAMS(assign), PARAMS(print))         \
 145
 146 #undef TRACE_EVENT_FLAGS
 147 #define TRACE_EVENT_FLAGS(name, value)                                  \
 148         __TRACE_EVENT_FLAGS(name, value)
 149
 150 #undef TRACE_EVENT_PERF_PERM
 151 #define TRACE_EVENT_PERF_PERM(name, expr...)                            \
 152         __TRACE_EVENT_PERF_PERM(name, expr)
 153
 154 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 155
 156 /*
 157  * Stage 2 of the trace events.
 158  *
 159  * Include the following:
 160  *
 161  * struct trace_event_data_offsets_<call> {
 162  *      u32                             <item1>;
 163  *      u32                             <item2>;
 164  *      [...]
 165  * };
 166  *
 167  * The __dynamic_array() macro will create each u32 <item>, this is
 168  * to keep the offset of each array from the beginning of the event.
 169  * The size of an array is also encoded, in the higher 16 bits of <item>.
 170  */
 171
 172 #undef TRACE_DEFINE_ENUM
 173 #define TRACE_DEFINE_ENUM(a)
 174
 175 #undef TRACE_DEFINE_SIZEOF
 176 #define TRACE_DEFINE_SIZEOF(a)
 177
 178 #undef __field
 179 #define __field(type, item)
 180
 181 #undef __field_ext
 182 #define __field_ext(type, item, filter_type)
 183
 184 #undef __field_struct
 185 #define __field_struct(type, item)
 186
 187 #undef __field_struct_ext
 188 #define __field_struct_ext(type, item, filter_type)
 189
 190 #undef __array
 191 #define __array(type, item, len)
 192
 193 #undef __dynamic_array
 194 #define __dynamic_array(type, item, len)        u32 item;
 195
 196 #undef __string
 197 #define __string(item, src) __dynamic_array(char, item, -1)
 198
 199 #undef __bitmask
 200 #define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item, -1)
 201
 202 #undef DECLARE_EVENT_CLASS
 203 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 204         struct trace_event_data_offsets_##call {                        \
 205                 tstruct;                                                \
 206         };
 207
 208 #undef DEFINE_EVENT
 209 #define DEFINE_EVENT(template, name, proto, args)
 210
 211 #undef DEFINE_EVENT_PRINT
 212 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
 213         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 214
 215 #undef TRACE_EVENT_FLAGS
 216 #define TRACE_EVENT_FLAGS(event, flag)
 217
 218 #undef TRACE_EVENT_PERF_PERM
 219 #define TRACE_EVENT_PERF_PERM(event, expr...)
 220
 221 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 222
 223 /*
 224  * Stage 3 of the trace events.
 225  *
 226  * Override the macros in <trace/trace_events.h> to include the following:
 227  *
 228  * enum print_line_t
 229  * trace_raw_output_<call>(struct trace_iterator *iter, int flags)
 230  * {
 231  *      struct trace_seq *s = &iter->seq;
 232  *      struct trace_event_raw_<call> *field; <-- defined in stage 1
 233  *      struct trace_entry *entry;
 234  *      struct trace_seq *p = &iter->tmp_seq;
 235  *      int ret;
 236  *
 237  *      entry = iter->ent;
 238  *
 239  *      if (entry->type != event_<call>->event.type) {
 240  *              WARN_ON_ONCE(1);
 241  *              return TRACE_TYPE_UNHANDLED;
 242  *      }
 243  *
 244  *      field = (typeof(field))entry;
 245  *
 246  *      trace_seq_init(p);
 247  *      ret = trace_seq_printf(s, "%s: ", <call>);
 248  *      if (ret)
 249  *              ret = trace_seq_printf(s, <TP_printk> "\n");
 250  *      if (!ret)
 251  *              return TRACE_TYPE_PARTIAL_LINE;
 252  *
 253  *      return TRACE_TYPE_HANDLED;
 254  * }
 255  *
 256  * This is the method used to print the raw event to the trace
 257  * output format. Note, this is not needed if the data is read
 258  * in binary.
 259  */
 260
 261 #undef __entry
 262 #define __entry field
 263
 264 #undef TP_printk
 265 #define TP_printk(fmt, args...) fmt "\n", args
 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)                                            \
 280         ({                                                              \
 281                 void *__bitmask = __get_dynamic_array(field);           \
 282                 unsigned int __bitmask_size;                            \
 283                 __bitmask_size = __get_dynamic_array_len(field);        \
 284                 trace_print_bitmask_seq(p, __bitmask, __bitmask_size);  \
 285         })
 286
 287 #undef __print_flags
 288 #define __print_flags(flag, delim, flag_array...)                       \
 289         ({                                                              \
 290                 static const struct trace_print_flags __flags[] =       \
 291                         { flag_array, { -1, NULL }};                    \
 292                 trace_print_flags_seq(p, delim, flag, __flags); \
 293         })
 294
 295 #undef __print_symbolic
 296 #define __print_symbolic(value, symbol_array...)                        \
 297         ({                                                              \
 298                 static const struct trace_print_flags symbols[] =       \
 299                         { symbol_array, { -1, NULL }};                  \
 300                 trace_print_symbols_seq(p, value, symbols);             \
 301         })
 302
 303 #undef __print_flags_u64
 304 #undef __print_symbolic_u64
 305 #if BITS_PER_LONG == 32
 306 #define __print_flags_u64(flag, delim, flag_array...)                   \
 307         ({                                                              \
 308                 static const struct trace_print_flags_u64 __flags[] =   \
 309                         { flag_array, { -1, NULL } };                   \
 310                 trace_print_flags_seq_u64(p, delim, flag, __flags);     \
 311         })
 312
 313 #define __print_symbolic_u64(value, symbol_array...)                    \
 314         ({                                                              \
 315                 static const struct trace_print_flags_u64 symbols[] =   \
 316                         { symbol_array, { -1, NULL } };                 \
 317                 trace_print_symbols_seq_u64(p, value, symbols); \
 318         })
 319 #else
 320 #define __print_flags_u64(flag, delim, flag_array...)                   \
 321                         __print_flags(flag, delim, flag_array)
 322
 323 #define __print_symbolic_u64(value, symbol_array...)                    \
 324                         __print_symbolic(value, symbol_array)
 325 #endif
 326
 327 #undef __print_hex
 328 #define __print_hex(buf, buf_len)                                       \
 329         trace_print_hex_seq(p, buf, buf_len, false)
 330
 331 #undef __print_hex_str
 332 #define __print_hex_str(buf, buf_len)                                   \
 333         trace_print_hex_seq(p, buf, buf_len, true)
 334
 335 #undef __print_array
 336 #define __print_array(array, count, el_size)                            \
 337         ({                                                              \
 338                 BUILD_BUG_ON(el_size != 1 && el_size != 2 &&            \
 339                              el_size != 4 && el_size != 8);             \
 340                 trace_print_array_seq(p, array, count, el_size);        \
 341         })
 342
 343 #undef __print_hex_dump
 344 #define __print_hex_dump(prefix_str, prefix_type,                       \
 345                          rowsize, groupsize, buf, len, ascii)           \
 346         trace_print_hex_dump_seq(p, prefix_str, prefix_type,            \
 347                                  rowsize, groupsize, buf, len, ascii)
 348
 349 #undef DECLARE_EVENT_CLASS
 350 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 351 static notrace enum print_line_t                                        \
 352 trace_raw_output_##call(struct trace_iterator *iter, int flags,         \
 353                         struct trace_event *trace_event)                \
 354 {                                                                       \
 355         struct trace_seq *s = &iter->seq;                               \
 356         struct trace_seq __maybe_unused *p = &iter->tmp_seq;            \
 357         struct trace_event_raw_##call *field;                           \
 358         int ret;                                                        \
 359                                                                         \
 360         field = (typeof(field))iter->ent;                               \
 361                                                                         \
 362         ret = trace_raw_output_prep(iter, trace_event);                 \
 363         if (ret != TRACE_TYPE_HANDLED)                                  \
 364                 return ret;                                             \
 365                                                                         \
 366         trace_seq_printf(s, print);                                     \
 367                                                                         \
 368         return trace_handle_return(s);                                  \
 369 }                                                                       \
 370 static struct trace_event_functions trace_event_type_funcs_##call = {   \
 371         .trace                  = trace_raw_output_##call,              \
 372 };
 373
 374 #undef DEFINE_EVENT_PRINT
 375 #define DEFINE_EVENT_PRINT(template, call, proto, args, print)          \
 376 static notrace enum print_line_t                                        \
 377 trace_raw_output_##call(struct trace_iterator *iter, int flags,         \
 378                          struct trace_event *event)                     \
 379 {                                                                       \
 380         struct trace_event_raw_##template *field;                       \
 381         struct trace_entry *entry;                                      \
 382         struct trace_seq *p = &iter->tmp_seq;                           \
 383                                                                         \
 384         entry = iter->ent;                                              \
 385                                                                         \
 386         if (entry->type != event_##call.event.type) {                   \
 387                 WARN_ON_ONCE(1);                                        \
 388                 return TRACE_TYPE_UNHANDLED;                            \
 389         }                                                               \
 390                                                                         \
 391         field = (typeof(field))entry;                                   \
 392                                                                         \
 393         trace_seq_init(p);                                              \
 394         return trace_output_call(iter, #call, print);                   \
 395 }                                                                       \
 396 static struct trace_event_functions trace_event_type_funcs_##call = {   \
 397         .trace                  = trace_raw_output_##call,              \
 398 };
 399
 400 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 401
 402 #undef __field_ext
 403 #define __field_ext(type, item, filter_type)                            \
 404         ret = trace_define_field(event_call, #type, #item,              \
 405                                  offsetof(typeof(field), item),         \
 406                                  sizeof(field.item),                    \
 407                                  is_signed_type(type), filter_type);    \
 408         if (ret)                                                        \
 409                 return ret;
 410
 411 #undef __field_struct_ext
 412 #define __field_struct_ext(type, item, filter_type)                     \
 413         ret = trace_define_field(event_call, #type, #item,              \
 414                                  offsetof(typeof(field), item),         \
 415                                  sizeof(field.item),                    \
 416                                  0, filter_type);                       \
 417         if (ret)                                                        \
 418                 return ret;
 419
 420 #undef __field
 421 #define __field(type, item)     __field_ext(type, item, FILTER_OTHER)
 422
 423 #undef __field_struct
 424 #define __field_struct(type, item) __field_struct_ext(type, item, FILTER_OTHER)
 425
 426 #undef __array
 427 #define __array(type, item, len)                                        \
 428         do {                                                            \
 429                 char *type_str = #type"["__stringify(len)"]";           \
 430                 BUILD_BUG_ON(len > MAX_FILTER_STR_VAL);                 \
 431                 BUILD_BUG_ON(len <= 0);                                 \
 432                 ret = trace_define_field(event_call, type_str, #item,   \
 433                                  offsetof(typeof(field), item),         \
 434                                  sizeof(field.item),                    \
 435                                  is_signed_type(type), FILTER_OTHER);   \
 436                 if (ret)                                                \
 437                         return ret;                                     \
 438         } while (0);
 439
 440 #undef __dynamic_array
 441 #define __dynamic_array(type, item, len)                                       \
 442         ret = trace_define_field(event_call, "__data_loc " #type "[]", #item,  \
 443                                  offsetof(typeof(field), __data_loc_##item),   \
 444                                  sizeof(field.__data_loc_##item),              \
 445                                  is_signed_type(type), FILTER_OTHER);
 446
 447 #undef __string
 448 #define __string(item, src) __dynamic_array(char, item, -1)
 449
 450 #undef __bitmask
 451 #define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item, -1)
 452
 453 #undef DECLARE_EVENT_CLASS
 454 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, func, print)    \
 455 static int notrace __init                                               \
 456 trace_event_define_fields_##call(struct trace_event_call *event_call)   \
 457 {                                                                       \
 458         struct trace_event_raw_##call field;                            \
 459         int ret;                                                        \
 460                                                                         \
 461         tstruct;                                                        \
 462                                                                         \
 463         return ret;                                                     \
 464 }
 465
 466 #undef DEFINE_EVENT
 467 #define DEFINE_EVENT(template, name, proto, args)
 468
 469 #undef DEFINE_EVENT_PRINT
 470 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
 471         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 472
 473 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 474
 475 /*
 476  * remember the offset of each array from the beginning of the event.
 477  */
 478
 479 #undef __entry
 480 #define __entry entry
 481
 482 #undef __field
 483 #define __field(type, item)
 484
 485 #undef __field_ext
 486 #define __field_ext(type, item, filter_type)
 487
 488 #undef __field_struct
 489 #define __field_struct(type, item)
 490
 491 #undef __field_struct_ext
 492 #define __field_struct_ext(type, item, filter_type)
 493
 494 #undef __array
 495 #define __array(type, item, len)
 496
 497 #undef __dynamic_array
 498 #define __dynamic_array(type, item, len)                                \
 499         __item_length = (len) * sizeof(type);                           \
 500         __data_offsets->item = __data_size +                            \
 501                                offsetof(typeof(*entry), __data);        \
 502         __data_offsets->item |= __item_length << 16;                    \
 503         __data_size += __item_length;
 504
 505 #undef __string
 506 #define __string(item, src) __dynamic_array(char, item,                 \
 507                     strlen((src) ? (const char *)(src) : "(null)") + 1)
 508
 509 /*
 510  * __bitmask_size_in_bytes_raw is the number of bytes needed to hold
 511  * num_possible_cpus().
 512  */
 513 #define __bitmask_size_in_bytes_raw(nr_bits)    \
 514         (((nr_bits) + 7) / 8)
 515
 516 #define __bitmask_size_in_longs(nr_bits)                        \
 517         ((__bitmask_size_in_bytes_raw(nr_bits) +                \
 518           ((BITS_PER_LONG / 8) - 1)) / (BITS_PER_LONG / 8))
 519
 520 /*
 521  * __bitmask_size_in_bytes is the number of bytes needed to hold
 522  * num_possible_cpus() padded out to the nearest long. This is what
 523  * is saved in the buffer, just to be consistent.
 524  */
 525 #define __bitmask_size_in_bytes(nr_bits)                                \
 526         (__bitmask_size_in_longs(nr_bits) * (BITS_PER_LONG / 8))
 527
 528 #undef __bitmask
 529 #define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item,   \
 530                                          __bitmask_size_in_longs(nr_bits))
 531
 532 #undef DECLARE_EVENT_CLASS
 533 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 534 static inline notrace int trace_event_get_offsets_##call(               \
 535         struct trace_event_data_offsets_##call *__data_offsets, proto)  \
 536 {                                                                       \
 537         int __data_size = 0;                                            \
 538         int __maybe_unused __item_length;                               \
 539         struct trace_event_raw_##call __maybe_unused *entry;            \
 540                                                                         \
 541         tstruct;                                                        \
 542                                                                         \
 543         return __data_size;                                             \
 544 }
 545
 546 #undef DEFINE_EVENT
 547 #define DEFINE_EVENT(template, name, proto, args)
 548
 549 #undef DEFINE_EVENT_PRINT
 550 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
 551         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 552
 553 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 554
 555 /*
 556  * Stage 4 of the trace events.
 557  *
 558  * Override the macros in <trace/trace_events.h> to include the following:
 559  *
 560  * For those macros defined with TRACE_EVENT:
 561  *
 562  * static struct trace_event_call event_<call>;
 563  *
 564  * static void trace_event_raw_event_<call>(void *__data, proto)
 565  * {
 566  *      struct trace_event_file *trace_file = __data;
 567  *      struct trace_event_call *event_call = trace_file->event_call;
 568  *      struct trace_event_data_offsets_<call> __maybe_unused __data_offsets;
 569  *      unsigned long eflags = trace_file->flags;
 570  *      enum event_trigger_type __tt = ETT_NONE;
 571  *      struct ring_buffer_event *event;
 572  *      struct trace_event_raw_<call> *entry; <-- defined in stage 1
 573  *      struct ring_buffer *buffer;
 574  *      unsigned long irq_flags;
 575  *      int __data_size;
 576  *      int pc;
 577  *
 578  *      if (!(eflags & EVENT_FILE_FL_TRIGGER_COND)) {
 579  *              if (eflags & EVENT_FILE_FL_TRIGGER_MODE)
 580  *                      event_triggers_call(trace_file, NULL);
 581  *              if (eflags & EVENT_FILE_FL_SOFT_DISABLED)
 582  *                      return;
 583  *      }
 584  *
 585  *      local_save_flags(irq_flags);
 586  *      pc = preempt_count();
 587  *
 588  *      __data_size = trace_event_get_offsets_<call>(&__data_offsets, args);
 589  *
 590  *      event = trace_event_buffer_lock_reserve(&buffer, trace_file,
 591  *                                event_<call>->event.type,
 592  *                                sizeof(*entry) + __data_size,
 593  *                                irq_flags, pc);
 594  *      if (!event)
 595  *              return;
 596  *      entry   = ring_buffer_event_data(event);
 597  *
 598  *      { <assign>; }  <-- Here we assign the entries by the __field and
 599  *                         __array macros.
 600  *
 601  *      if (eflags & EVENT_FILE_FL_TRIGGER_COND)
 602  *              __tt = event_triggers_call(trace_file, entry);
 603  *
 604  *      if (test_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT,
 605  *                   &trace_file->flags))
 606  *              ring_buffer_discard_commit(buffer, event);
 607  *      else if (!filter_check_discard(trace_file, entry, buffer, event))
 608  *              trace_buffer_unlock_commit(buffer, event, irq_flags, pc);
 609  *
 610  *      if (__tt)
 611  *              event_triggers_post_call(trace_file, __tt);
 612  * }
 613  *
 614  * static struct trace_event ftrace_event_type_<call> = {
 615  *      .trace                  = trace_raw_output_<call>, <-- stage 2
 616  * };
 617  *
 618  * static char print_fmt_<call>[] = <TP_printk>;
 619  *
 620  * static struct trace_event_class __used event_class_<template> = {
 621  *      .system                 = "<system>",
 622  *      .define_fields          = trace_event_define_fields_<call>,
 623  *      .fields                 = LIST_HEAD_INIT(event_class_##call.fields),
 624  *      .raw_init               = trace_event_raw_init,
 625  *      .probe                  = trace_event_raw_event_##call,
 626  *      .reg                    = trace_event_reg,
 627  * };
 628  *
 629  * static struct trace_event_call event_<call> = {
 630  *      .class                  = event_class_<template>,
 631  *      {
 632  *              .tp                     = &__tracepoint_<call>,
 633  *      },
 634  *      .event                  = &ftrace_event_type_<call>,
 635  *      .print_fmt              = print_fmt_<call>,
 636  *      .flags                  = TRACE_EVENT_FL_TRACEPOINT,
 637  * };
 638  * // its only safe to use pointers when doing linker tricks to
 639  * // create an array.
 640  * static struct trace_event_call __used
 641  * __attribute__((section("_ftrace_events"))) *__event_<call> = &event_<call>;
 642  *
 643  */
 644
 645 #ifdef CONFIG_PERF_EVENTS
 646
 647 #define _TRACE_PERF_PROTO(call, proto)                                  \
 648         static notrace void                                             \
 649         perf_trace_##call(void *__data, proto);
 650
 651 #define _TRACE_PERF_INIT(call)                                          \
 652         .perf_probe             = perf_trace_##call,
 653
 654 #else
 655 #define _TRACE_PERF_PROTO(call, proto)
 656 #define _TRACE_PERF_INIT(call)
 657 #endif /* CONFIG_PERF_EVENTS */
 658
 659 #undef __entry
 660 #define __entry entry
 661
 662 #undef __field
 663 #define __field(type, item)
 664
 665 #undef __field_struct
 666 #define __field_struct(type, item)
 667
 668 #undef __array
 669 #define __array(type, item, len)
 670
 671 #undef __dynamic_array
 672 #define __dynamic_array(type, item, len)                                \
 673         __entry->__data_loc_##item = __data_offsets.item;
 674
 675 #undef __string
 676 #define __string(item, src) __dynamic_array(char, item, -1)
 677
 678 #undef __assign_str
 679 #define __assign_str(dst, src)                                          \
 680         strcpy(__get_str(dst), (src) ? (const char *)(src) : "(null)");
 681
 682 #undef __bitmask
 683 #define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item, -1)
 684
 685 #undef __get_bitmask
 686 #define __get_bitmask(field) (char *)__get_dynamic_array(field)
 687
 688 #undef __assign_bitmask
 689 #define __assign_bitmask(dst, src, nr_bits)                                     \
 690         memcpy(__get_bitmask(dst), (src), __bitmask_size_in_bytes(nr_bits))
 691
 692 #undef TP_fast_assign
 693 #define TP_fast_assign(args...) args
 694
 695 #undef __perf_count
 696 #define __perf_count(c) (c)
 697
 698 #undef __perf_task
 699 #define __perf_task(t)  (t)
 700
 701 #undef DECLARE_EVENT_CLASS
 702 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 703                                                                         \
 704 static notrace void                                                     \
 705 trace_event_raw_event_##call(void *__data, proto)                       \
 706 {                                                                       \
 707         struct trace_event_file *trace_file = __data;                   \
 708         struct trace_event_data_offsets_##call __maybe_unused __data_offsets;\
 709         struct trace_event_buffer fbuffer;                              \
 710         struct trace_event_raw_##call *entry;                           \
 711         int __data_size;                                                \
 712                                                                         \
 713         if (trace_trigger_soft_disabled(trace_file))                    \
 714                 return;                                                 \
 715                                                                         \
 716         __data_size = trace_event_get_offsets_##call(&__data_offsets, args); \
 717                                                                         \
 718         entry = trace_event_buffer_reserve(&fbuffer, trace_file,        \
 719                                  sizeof(*entry) + __data_size);         \
 720                                                                         \
 721         if (!entry)                                                     \
 722                 return;                                                 \
 723                                                                         \
 724         tstruct                                                         \
 725                                                                         \
 726         { assign; }                                                     \
 727                                                                         \
 728         trace_event_buffer_commit(&fbuffer);                            \
 729 }
 730 /*
 731  * The ftrace_test_probe is compiled out, it is only here as a build time check
 732  * to make sure that if the tracepoint handling changes, the ftrace probe will
 733  * fail to compile unless it too is updated.
 734  */
 735
 736 #undef DEFINE_EVENT
 737 #define DEFINE_EVENT(template, call, proto, args)                       \
 738 static inline void ftrace_test_probe_##call(void)                       \
 739 {                                                                       \
 740         check_trace_callback_type_##call(trace_event_raw_event_##template); \
 741 }
 742
 743 #undef DEFINE_EVENT_PRINT
 744 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)
 745
 746 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 747
 748 #undef __entry
 749 #define __entry REC
 750
 751 #undef __print_flags
 752 #undef __print_symbolic
 753 #undef __print_hex
 754 #undef __print_hex_str
 755 #undef __get_dynamic_array
 756 #undef __get_dynamic_array_len
 757 #undef __get_str
 758 #undef __get_bitmask
 759 #undef __print_array
 760 #undef __print_hex_dump
 761
 762 #undef TP_printk
 763 #define TP_printk(fmt, args...) "\"" fmt "\", "  __stringify(args)
 764
 765 #undef DECLARE_EVENT_CLASS
 766 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 767 _TRACE_PERF_PROTO(call, PARAMS(proto));                                 \
 768 static char print_fmt_##call[] = print;                                 \
 769 static struct trace_event_class __used __refdata event_class_##call = { \
 770         .system                 = TRACE_SYSTEM_STRING,                  \
 771         .define_fields          = trace_event_define_fields_##call,     \
 772         .fields                 = LIST_HEAD_INIT(event_class_##call.fields),\
 773         .raw_init               = trace_event_raw_init,                 \
 774         .probe                  = trace_event_raw_event_##call,         \
 775         .reg                    = trace_event_reg,                      \
 776         _TRACE_PERF_INIT(call)                                          \
 777 };
 778
 779 #undef DEFINE_EVENT
 780 #define DEFINE_EVENT(template, call, proto, args)                       \
 781                                                                         \
 782 static struct trace_event_call __used event_##call = {                  \
 783         .class                  = &event_class_##template,              \
 784         {                                                               \
 785                 .tp                     = &__tracepoint_##call,         \
 786         },                                                              \
 787         .event.funcs            = &trace_event_type_funcs_##template,   \
 788         .print_fmt              = print_fmt_##template,                 \
 789         .flags                  = TRACE_EVENT_FL_TRACEPOINT,            \
 790 };                                                                      \
 791 static struct trace_event_call __used                                   \
 792 __attribute__((section("_ftrace_events"))) *__event_##call = &event_##call
 793
 794 #undef DEFINE_EVENT_PRINT
 795 #define DEFINE_EVENT_PRINT(template, call, proto, args, print)          \
 796                                                                         \
 797 static char print_fmt_##call[] = print;                                 \
 798                                                                         \
 799 static struct trace_event_call __used event_##call = {                  \
 800         .class                  = &event_class_##template,              \
 801         {                                                               \
 802                 .tp                     = &__tracepoint_##call,         \
 803         },                                                              \
 804         .event.funcs            = &trace_event_type_funcs_##call,       \
 805         .print_fmt              = print_fmt_##call,                     \
 806         .flags                  = TRACE_EVENT_FL_TRACEPOINT,            \
 807 };                                                                      \
 808 static struct trace_event_call __used                                   \
 809 __attribute__((section("_ftrace_events"))) *__event_##call = &event_##call
 810
 811 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)