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         __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         __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
 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 the event tracepoint header <trace/events/XXX.h>
 227  * to include the following:
 228  *
 229  * enum print_line_t
 230  * trace_raw_output_<call>(struct trace_iterator *iter, int flags)
 231  * {
 232  *      struct trace_seq *s = &iter->seq;
 233  *      struct trace_event_raw_<call> *field; <-- defined in stage 1
 234  *      struct trace_entry *entry;
 235  *      struct trace_seq *p = &iter->tmp_seq;
 236  *      int ret;
 237  *
 238  *      entry = iter->ent;
 239  *
 240  *      if (entry->type != event_<call>->event.type) {
 241  *              WARN_ON_ONCE(1);
 242  *              return TRACE_TYPE_UNHANDLED;
 243  *      }
 244  *
 245  *      field = (typeof(field))entry;
 246  *
 247  *      trace_seq_init(p);
 248  *      ret = trace_seq_printf(s, "%s: ", <call>);
 249  *      if (ret)
 250  *              ret = trace_seq_printf(s, <TP_printk> "\n");
 251  *      if (!ret)
 252  *              return TRACE_TYPE_PARTIAL_LINE;
 253  *
 254  *      return TRACE_TYPE_HANDLED;
 255  * }
 256  *
 257  * This is the method used to print the raw event to the trace
 258  * output format. Note, this is not needed if the data is read
 259  * in binary.
 260  */
 261
 262 #undef __entry
 263 #define __entry field
 264
 265 #undef TP_printk
 266 #define TP_printk(fmt, args...) fmt "\n", args
 267
 268 #undef __get_dynamic_array
 269 #define __get_dynamic_array(field)      \
 270                 ((void *)__entry + (__entry->__data_loc_##field & 0xffff))
 271
 272 #undef __get_dynamic_array_len
 273 #define __get_dynamic_array_len(field)  \
 274                 ((__entry->__data_loc_##field >> 16) & 0xffff)
 275
 276 #undef __get_str
 277 #define __get_str(field) ((char *)__get_dynamic_array(field))
 278
 279 #undef __get_bitmask
 280 #define __get_bitmask(field)                                            \
 281         ({                                                              \
 282                 void *__bitmask = __get_dynamic_array(field);           \
 283                 unsigned int __bitmask_size;                            \
 284                 __bitmask_size = __get_dynamic_array_len(field);        \
 285                 trace_print_bitmask_seq(p, __bitmask, __bitmask_size);  \
 286         })
 287
 288 #undef __print_flags
 289 #define __print_flags(flag, delim, flag_array...)                       \
 290         ({                                                              \
 291                 static const struct trace_print_flags __flags[] =       \
 292                         { flag_array, { -1, NULL }};                    \
 293                 trace_print_flags_seq(p, delim, flag, __flags); \
 294         })
 295
 296 #undef __print_symbolic
 297 #define __print_symbolic(value, symbol_array...)                        \
 298         ({                                                              \
 299                 static const struct trace_print_flags symbols[] =       \
 300                         { symbol_array, { -1, NULL }};                  \
 301                 trace_print_symbols_seq(p, value, symbols);             \
 302         })
 303
 304 #undef __print_flags_u64
 305 #undef __print_symbolic_u64
 306 #if BITS_PER_LONG == 32
 307 #define __print_flags_u64(flag, delim, flag_array...)                   \
 308         ({                                                              \
 309                 static const struct trace_print_flags_u64 __flags[] =   \
 310                         { flag_array, { -1, NULL } };                   \
 311                 trace_print_flags_seq_u64(p, delim, flag, __flags);     \
 312         })
 313
 314 #define __print_symbolic_u64(value, symbol_array...)                    \
 315         ({                                                              \
 316                 static const struct trace_print_flags_u64 symbols[] =   \
 317                         { symbol_array, { -1, NULL } };                 \
 318                 trace_print_symbols_seq_u64(p, value, symbols); \
 319         })
 320 #else
 321 #define __print_flags_u64(flag, delim, flag_array...)                   \
 322                         __print_flags(flag, delim, flag_array)
 323
 324 #define __print_symbolic_u64(value, symbol_array...)                    \
 325                         __print_symbolic(value, symbol_array)
 326 #endif
 327
 328 #undef __print_hex
 329 #define __print_hex(buf, buf_len)                                       \
 330         trace_print_hex_seq(p, buf, buf_len, false)
 331
 332 #undef __print_hex_str
 333 #define __print_hex_str(buf, buf_len)                                   \
 334         trace_print_hex_seq(p, buf, buf_len, true)
 335
 336 #undef __print_array
 337 #define __print_array(array, count, el_size)                            \
 338         ({                                                              \
 339                 BUILD_BUG_ON(el_size != 1 && el_size != 2 &&            \
 340                              el_size != 4 && el_size != 8);             \
 341                 trace_print_array_seq(p, array, count, el_size);        \
 342         })
 343
 344 #undef __print_hex_dump
 345 #define __print_hex_dump(prefix_str, prefix_type,                       \
 346                          rowsize, groupsize, buf, len, ascii)           \
 347         trace_print_hex_dump_seq(p, prefix_str, prefix_type,            \
 348                                  rowsize, groupsize, buf, len, ascii)
 349
 350 #undef DECLARE_EVENT_CLASS
 351 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 352 static notrace enum print_line_t                                        \
 353 trace_raw_output_##call(struct trace_iterator *iter, int flags,         \
 354                         struct trace_event *trace_event)                \
 355 {                                                                       \
 356         struct trace_seq *s = &iter->seq;                               \
 357         struct trace_seq __maybe_unused *p = &iter->tmp_seq;            \
 358         struct trace_event_raw_##call *field;                           \
 359         int ret;                                                        \
 360                                                                         \
 361         field = (typeof(field))iter->ent;                               \
 362                                                                         \
 363         ret = trace_raw_output_prep(iter, trace_event);                 \
 364         if (ret != TRACE_TYPE_HANDLED)                                  \
 365                 return ret;                                             \
 366                                                                         \
 367         trace_event_printf(iter, print);                                \
 368                                                                         \
 369         return trace_handle_return(s);                                  \
 370 }                                                                       \
 371 static struct trace_event_functions trace_event_type_funcs_##call = {   \
 372         .trace                  = trace_raw_output_##call,              \
 373 };
 374
 375 #undef DEFINE_EVENT_PRINT
 376 #define DEFINE_EVENT_PRINT(template, call, proto, args, print)          \
 377 static notrace enum print_line_t                                        \
 378 trace_raw_output_##call(struct trace_iterator *iter, int flags,         \
 379                          struct trace_event *event)                     \
 380 {                                                                       \
 381         struct trace_event_raw_##template *field;                       \
 382         struct trace_entry *entry;                                      \
 383         struct trace_seq *p = &iter->tmp_seq;                           \
 384                                                                         \
 385         entry = iter->ent;                                              \
 386                                                                         \
 387         if (entry->type != event_##call.event.type) {                   \
 388                 WARN_ON_ONCE(1);                                        \
 389                 return TRACE_TYPE_UNHANDLED;                            \
 390         }                                                               \
 391                                                                         \
 392         field = (typeof(field))entry;                                   \
 393                                                                         \
 394         trace_seq_init(p);                                              \
 395         return trace_output_call(iter, #call, print);                   \
 396 }                                                                       \
 397 static struct trace_event_functions trace_event_type_funcs_##call = {   \
 398         .trace                  = trace_raw_output_##call,              \
 399 };
 400
 401 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 402
 403 #define ALIGN_STRUCTFIELD(type) ((int)(__alignof__(struct {type b;})))
 404
 405 #undef __field_ext
 406 #define __field_ext(_type, _item, _filter_type) {                       \
 407         .type = #_type, .name = #_item,                                 \
 408         .size = sizeof(_type), .align = ALIGN_STRUCTFIELD(_type),       \
 409         .is_signed = is_signed_type(_type), .filter_type = _filter_type },
 410
 411 #undef __field_struct_ext
 412 #define __field_struct_ext(_type, _item, _filter_type) {                \
 413         .type = #_type, .name = #_item,                                 \
 414         .size = sizeof(_type), .align = ALIGN_STRUCTFIELD(_type),       \
 415         0, .filter_type = _filter_type },
 416
 417 #undef __field
 418 #define __field(type, item)     __field_ext(type, item, FILTER_OTHER)
 419
 420 #undef __field_struct
 421 #define __field_struct(type, item) __field_struct_ext(type, item, FILTER_OTHER)
 422
 423 #undef __array
 424 #define __array(_type, _item, _len) {                                   \
 425         .type = #_type"["__stringify(_len)"]", .name = #_item,          \
 426         .size = sizeof(_type[_len]), .align = ALIGN_STRUCTFIELD(_type), \
 427         .is_signed = is_signed_type(_type), .filter_type = FILTER_OTHER },
 428
 429 #undef __dynamic_array
 430 #define __dynamic_array(_type, _item, _len) {                           \
 431         .type = "__data_loc " #_type "[]", .name = #_item,              \
 432         .size = 4, .align = 4,                                          \
 433         .is_signed = is_signed_type(_type), .filter_type = FILTER_OTHER },
 434
 435 #undef __string
 436 #define __string(item, src) __dynamic_array(char, item, -1)
 437
 438 #undef __bitmask
 439 #define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item, -1)
 440
 441 #undef DECLARE_EVENT_CLASS
 442 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, func, print)    \
 443 static struct trace_event_fields trace_event_fields_##call[] = {        \
 444         tstruct                                                         \
 445         {} };
 446
 447 #undef DEFINE_EVENT_PRINT
 448 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)
 449
 450 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 451
 452 /*
 453  * remember the offset of each array from the beginning of the event.
 454  */
 455
 456 #undef __entry
 457 #define __entry entry
 458
 459 #undef __field
 460 #define __field(type, item)
 461
 462 #undef __field_ext
 463 #define __field_ext(type, item, filter_type)
 464
 465 #undef __field_struct
 466 #define __field_struct(type, item)
 467
 468 #undef __field_struct_ext
 469 #define __field_struct_ext(type, item, filter_type)
 470
 471 #undef __array
 472 #define __array(type, item, len)
 473
 474 #undef __dynamic_array
 475 #define __dynamic_array(type, item, len)                                \
 476         __item_length = (len) * sizeof(type);                           \
 477         __data_offsets->item = __data_size +                            \
 478                                offsetof(typeof(*entry), __data);        \
 479         __data_offsets->item |= __item_length << 16;                    \
 480         __data_size += __item_length;
 481
 482 #undef __string
 483 #define __string(item, src) __dynamic_array(char, item,                 \
 484                     strlen((src) ? (const char *)(src) : "(null)") + 1)
 485
 486 /*
 487  * __bitmask_size_in_bytes_raw is the number of bytes needed to hold
 488  * num_possible_cpus().
 489  */
 490 #define __bitmask_size_in_bytes_raw(nr_bits)    \
 491         (((nr_bits) + 7) / 8)
 492
 493 #define __bitmask_size_in_longs(nr_bits)                        \
 494         ((__bitmask_size_in_bytes_raw(nr_bits) +                \
 495           ((BITS_PER_LONG / 8) - 1)) / (BITS_PER_LONG / 8))
 496
 497 /*
 498  * __bitmask_size_in_bytes is the number of bytes needed to hold
 499  * num_possible_cpus() padded out to the nearest long. This is what
 500  * is saved in the buffer, just to be consistent.
 501  */
 502 #define __bitmask_size_in_bytes(nr_bits)                                \
 503         (__bitmask_size_in_longs(nr_bits) * (BITS_PER_LONG / 8))
 504
 505 #undef __bitmask
 506 #define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item,   \
 507                                          __bitmask_size_in_longs(nr_bits))
 508
 509 #undef DECLARE_EVENT_CLASS
 510 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 511 static inline notrace int trace_event_get_offsets_##call(               \
 512         struct trace_event_data_offsets_##call *__data_offsets, proto)  \
 513 {                                                                       \
 514         int __data_size = 0;                                            \
 515         int __maybe_unused __item_length;                               \
 516         struct trace_event_raw_##call __maybe_unused *entry;            \
 517                                                                         \
 518         tstruct;                                                        \
 519                                                                         \
 520         return __data_size;                                             \
 521 }
 522
 523 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 524
 525 /*
 526  * Stage 4 of the trace events.
 527  *
 528  * Override the macros in the event tracepoint header <trace/events/XXX.h>
 529  * to include the following:
 530  *
 531  * For those macros defined with TRACE_EVENT:
 532  *
 533  * static struct trace_event_call event_<call>;
 534  *
 535  * static void trace_event_raw_event_<call>(void *__data, proto)
 536  * {
 537  *      struct trace_event_file *trace_file = __data;
 538  *      struct trace_event_call *event_call = trace_file->event_call;
 539  *      struct trace_event_data_offsets_<call> __maybe_unused __data_offsets;
 540  *      unsigned long eflags = trace_file->flags;
 541  *      enum event_trigger_type __tt = ETT_NONE;
 542  *      struct ring_buffer_event *event;
 543  *      struct trace_event_raw_<call> *entry; <-- defined in stage 1
 544  *      struct trace_buffer *buffer;
 545  *      unsigned long irq_flags;
 546  *      int __data_size;
 547  *      int pc;
 548  *
 549  *      if (!(eflags & EVENT_FILE_FL_TRIGGER_COND)) {
 550  *              if (eflags & EVENT_FILE_FL_TRIGGER_MODE)
 551  *                      event_triggers_call(trace_file, NULL);
 552  *              if (eflags & EVENT_FILE_FL_SOFT_DISABLED)
 553  *                      return;
 554  *      }
 555  *
 556  *      local_save_flags(irq_flags);
 557  *      pc = preempt_count();
 558  *
 559  *      __data_size = trace_event_get_offsets_<call>(&__data_offsets, args);
 560  *
 561  *      event = trace_event_buffer_lock_reserve(&buffer, trace_file,
 562  *                                event_<call>->event.type,
 563  *                                sizeof(*entry) + __data_size,
 564  *                                irq_flags, pc);
 565  *      if (!event)
 566  *              return;
 567  *      entry   = ring_buffer_event_data(event);
 568  *
 569  *      { <assign>; }  <-- Here we assign the entries by the __field and
 570  *                         __array macros.
 571  *
 572  *      if (eflags & EVENT_FILE_FL_TRIGGER_COND)
 573  *              __tt = event_triggers_call(trace_file, entry);
 574  *
 575  *      if (test_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT,
 576  *                   &trace_file->flags))
 577  *              ring_buffer_discard_commit(buffer, event);
 578  *      else if (!filter_check_discard(trace_file, entry, buffer, event))
 579  *              trace_buffer_unlock_commit(buffer, event, irq_flags, pc);
 580  *
 581  *      if (__tt)
 582  *              event_triggers_post_call(trace_file, __tt);
 583  * }
 584  *
 585  * static struct trace_event ftrace_event_type_<call> = {
 586  *      .trace                  = trace_raw_output_<call>, <-- stage 2
 587  * };
 588  *
 589  * static char print_fmt_<call>[] = <TP_printk>;
 590  *
 591  * static struct trace_event_class __used event_class_<template> = {
 592  *      .system                 = "<system>",
 593  *      .fields_array           = trace_event_fields_<call>,
 594  *      .fields                 = LIST_HEAD_INIT(event_class_##call.fields),
 595  *      .raw_init               = trace_event_raw_init,
 596  *      .probe                  = trace_event_raw_event_##call,
 597  *      .reg                    = trace_event_reg,
 598  * };
 599  *
 600  * static struct trace_event_call event_<call> = {
 601  *      .class                  = event_class_<template>,
 602  *      {
 603  *              .tp                     = &__tracepoint_<call>,
 604  *      },
 605  *      .event                  = &ftrace_event_type_<call>,
 606  *      .print_fmt              = print_fmt_<call>,
 607  *      .flags                  = TRACE_EVENT_FL_TRACEPOINT,
 608  * };
 609  * // its only safe to use pointers when doing linker tricks to
 610  * // create an array.
 611  * static struct trace_event_call __used
 612  * __section("_ftrace_events") *__event_<call> = &event_<call>;
 613  *
 614  */
 615
 616 #ifdef CONFIG_PERF_EVENTS
 617
 618 #define _TRACE_PERF_PROTO(call, proto)                                  \
 619         static notrace void                                             \
 620         perf_trace_##call(void *__data, proto);
 621
 622 #define _TRACE_PERF_INIT(call)                                          \
 623         .perf_probe             = perf_trace_##call,
 624
 625 #else
 626 #define _TRACE_PERF_PROTO(call, proto)
 627 #define _TRACE_PERF_INIT(call)
 628 #endif /* CONFIG_PERF_EVENTS */
 629
 630 #undef __entry
 631 #define __entry entry
 632
 633 #undef __field
 634 #define __field(type, item)
 635
 636 #undef __field_struct
 637 #define __field_struct(type, item)
 638
 639 #undef __array
 640 #define __array(type, item, len)
 641
 642 #undef __dynamic_array
 643 #define __dynamic_array(type, item, len)                                \
 644         __entry->__data_loc_##item = __data_offsets.item;
 645
 646 #undef __string
 647 #define __string(item, src) __dynamic_array(char, item, -1)
 648
 649 #undef __assign_str
 650 #define __assign_str(dst, src)                                          \
 651         strcpy(__get_str(dst), (src) ? (const char *)(src) : "(null)");
 652
 653 #undef __bitmask
 654 #define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item, -1)
 655
 656 #undef __get_bitmask
 657 #define __get_bitmask(field) (char *)__get_dynamic_array(field)
 658
 659 #undef __assign_bitmask
 660 #define __assign_bitmask(dst, src, nr_bits)                                     \
 661         memcpy(__get_bitmask(dst), (src), __bitmask_size_in_bytes(nr_bits))
 662
 663 #undef TP_fast_assign
 664 #define TP_fast_assign(args...) args
 665
 666 #undef __perf_count
 667 #define __perf_count(c) (c)
 668
 669 #undef __perf_task
 670 #define __perf_task(t)  (t)
 671
 672 #undef DECLARE_EVENT_CLASS
 673 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 674                                                                         \
 675 static notrace void                                                     \
 676 trace_event_raw_event_##call(void *__data, proto)                       \
 677 {                                                                       \
 678         struct trace_event_file *trace_file = __data;                   \
 679         struct trace_event_data_offsets_##call __maybe_unused __data_offsets;\
 680         struct trace_event_buffer fbuffer;                              \
 681         struct trace_event_raw_##call *entry;                           \
 682         int __data_size;                                                \
 683                                                                         \
 684         if (trace_trigger_soft_disabled(trace_file))                    \
 685                 return;                                                 \
 686                                                                         \
 687         __data_size = trace_event_get_offsets_##call(&__data_offsets, args); \
 688                                                                         \
 689         entry = trace_event_buffer_reserve(&fbuffer, trace_file,        \
 690                                  sizeof(*entry) + __data_size);         \
 691                                                                         \
 692         if (!entry)                                                     \
 693                 return;                                                 \
 694                                                                         \
 695         tstruct                                                         \
 696                                                                         \
 697         { assign; }                                                     \
 698                                                                         \
 699         trace_event_buffer_commit(&fbuffer);                            \
 700 }
 701 /*
 702  * The ftrace_test_probe is compiled out, it is only here as a build time check
 703  * to make sure that if the tracepoint handling changes, the ftrace probe will
 704  * fail to compile unless it too is updated.
 705  */
 706
 707 #undef DEFINE_EVENT
 708 #define DEFINE_EVENT(template, call, proto, args)                       \
 709 static inline void ftrace_test_probe_##call(void)                       \
 710 {                                                                       \
 711         check_trace_callback_type_##call(trace_event_raw_event_##template); \
 712 }
 713
 714 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 715
 716 #undef __entry
 717 #define __entry REC
 718
 719 #undef __print_flags
 720 #undef __print_symbolic
 721 #undef __print_hex
 722 #undef __print_hex_str
 723 #undef __get_dynamic_array
 724 #undef __get_dynamic_array_len
 725 #undef __get_str
 726 #undef __get_bitmask
 727 #undef __print_array
 728 #undef __print_hex_dump
 729
 730 #undef TP_printk
 731 #define TP_printk(fmt, args...) "\"" fmt "\", "  __stringify(args)
 732
 733 #undef DECLARE_EVENT_CLASS
 734 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 735 _TRACE_PERF_PROTO(call, PARAMS(proto));                                 \
 736 static char print_fmt_##call[] = print;                                 \
 737 static struct trace_event_class __used __refdata event_class_##call = { \
 738         .system                 = TRACE_SYSTEM_STRING,                  \
 739         .fields_array           = trace_event_fields_##call,            \
 740         .fields                 = LIST_HEAD_INIT(event_class_##call.fields),\
 741         .raw_init               = trace_event_raw_init,                 \
 742         .probe                  = trace_event_raw_event_##call,         \
 743         .reg                    = trace_event_reg,                      \
 744         _TRACE_PERF_INIT(call)                                          \
 745 };
 746
 747 #undef DEFINE_EVENT
 748 #define DEFINE_EVENT(template, call, proto, args)                       \
 749                                                                         \
 750 static struct trace_event_call __used event_##call = {                  \
 751         .class                  = &event_class_##template,              \
 752         {                                                               \
 753                 .tp                     = &__tracepoint_##call,         \
 754         },                                                              \
 755         .event.funcs            = &trace_event_type_funcs_##template,   \
 756         .print_fmt              = print_fmt_##template,                 \
 757         .flags                  = TRACE_EVENT_FL_TRACEPOINT,            \
 758 };                                                                      \
 759 static struct trace_event_call __used                                   \
 760 __section("_ftrace_events") *__event_##call = &event_##call
 761
 762 #undef DEFINE_EVENT_PRINT
 763 #define DEFINE_EVENT_PRINT(template, call, proto, args, print)          \
 764                                                                         \
 765 static char print_fmt_##call[] = print;                                 \
 766                                                                         \
 767 static struct trace_event_call __used event_##call = {                  \
 768         .class                  = &event_class_##template,              \
 769         {                                                               \
 770                 .tp                     = &__tracepoint_##call,         \
 771         },                                                              \
 772         .event.funcs            = &trace_event_type_funcs_##call,       \
 773         .print_fmt              = print_fmt_##call,                     \
 774         .flags                  = TRACE_EVENT_FL_TRACEPOINT,            \
 775 };                                                                      \
 776 static struct trace_event_call __used                                   \
 777 __section("_ftrace_events") *__event_##call = &event_##call
 778
 779 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)