LXR linux/include/trace/trace

   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
  36TRACE_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
 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)  \
 352static notrace enum print_line_t                                        \
 353trace_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_seq_printf(s, print);                                     \
 368                                                                        \
 369        return trace_handle_return(s);                                  \
 370}                                                                       \
 371static 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)          \
 377static notrace enum print_line_t                                        \
 378trace_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}                                                                       \
 397static 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#undef __field_ext
 404#define __field_ext(_type, _item, _filter_type) {                       \
 405        .type = #_type, .name = #_item,                                 \
 406        .size = sizeof(_type), .align = __alignof__(_type),             \
 407        .is_signed = is_signed_type(_type), .filter_type = _filter_type },
 408
 409#undef __field_struct_ext
 410#define __field_struct_ext(_type, _item, _filter_type) {                \
 411        .type = #_type, .name = #_item,                                 \
 412        .size = sizeof(_type), .align = __alignof__(_type),             \
 413        0, .filter_type = _filter_type },
 414
 415#undef __field
 416#define __field(type, item)     __field_ext(type, item, FILTER_OTHER)
 417
 418#undef __field_struct
 419#define __field_struct(type, item) __field_struct_ext(type, item, FILTER_OTHER)
 420
 421#undef __array
 422#define __array(_type, _item, _len) {                                   \
 423        .type = #_type"["__stringify(_len)"]", .name = #_item,          \
 424        .size = sizeof(_type[_len]), .align = __alignof__(_type),       \
 425        .is_signed = is_signed_type(_type), .filter_type = FILTER_OTHER },
 426
 427#undef __dynamic_array
 428#define __dynamic_array(_type, _item, _len) {                           \
 429        .type = "__data_loc " #_type "[]", .name = #_item,              \
 430        .size = 4, .align = 4,                                          \
 431        .is_signed = is_signed_type(_type), .filter_type = FILTER_OTHER },
 432
 433#undef __string
 434#define __string(item, src) __dynamic_array(char, item, -1)
 435
 436#undef __bitmask
 437#define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item, -1)
 438
 439#undef DECLARE_EVENT_CLASS
 440#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, func, print)    \
 441static struct trace_event_fields trace_event_fields_##call[] = {        \
 442        tstruct                                                         \
 443        {} };
 444
 445#undef DEFINE_EVENT_PRINT
 446#define DEFINE_EVENT_PRINT(template, name, proto, args, print)
 447
 448#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 449
 450/*
 451 * remember the offset of each array from the beginning of the event.
 452 */
 453
 454#undef __entry
 455#define __entry entry
 456
 457#undef __field
 458#define __field(type, item)
 459
 460#undef __field_ext
 461#define __field_ext(type, item, filter_type)
 462
 463#undef __field_struct
 464#define __field_struct(type, item)
 465
 466#undef __field_struct_ext
 467#define __field_struct_ext(type, item, filter_type)
 468
 469#undef __array
 470#define __array(type, item, len)
 471
 472#undef __dynamic_array
 473#define __dynamic_array(type, item, len)                                \
 474        __item_length = (len) * sizeof(type);                           \
 475        __data_offsets->item = __data_size +                            \
 476                               offsetof(typeof(*entry), __data);        \
 477        __data_offsets->item |= __item_length << 16;                    \
 478        __data_size += __item_length;
 479
 480#undef __string
 481#define __string(item, src) __dynamic_array(char, item,                 \
 482                    strlen((src) ? (const char *)(src) : "(null)") + 1)
 483
 484/*
 485 * __bitmask_size_in_bytes_raw is the number of bytes needed to hold
 486 * num_possible_cpus().
 487 */
 488#define __bitmask_size_in_bytes_raw(nr_bits)    \
 489        (((nr_bits) + 7) / 8)
 490
 491#define __bitmask_size_in_longs(nr_bits)                        \
 492        ((__bitmask_size_in_bytes_raw(nr_bits) +                \
 493          ((BITS_PER_LONG / 8) - 1)) / (BITS_PER_LONG / 8))
 494
 495/*
 496 * __bitmask_size_in_bytes is the number of bytes needed to hold
 497 * num_possible_cpus() padded out to the nearest long. This is what
 498 * is saved in the buffer, just to be consistent.
 499 */
 500#define __bitmask_size_in_bytes(nr_bits)                                \
 501        (__bitmask_size_in_longs(nr_bits) * (BITS_PER_LONG / 8))
 502
 503#undef __bitmask
 504#define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item,   \
 505                                         __bitmask_size_in_longs(nr_bits))
 506
 507#undef DECLARE_EVENT_CLASS
 508#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 509static inline notrace int trace_event_get_offsets_##call(               \
 510        struct trace_event_data_offsets_##call *__data_offsets, proto)  \
 511{                                                                       \
 512        int __data_size = 0;                                            \
 513        int __maybe_unused __item_length;                               \
 514        struct trace_event_raw_##call __maybe_unused *entry;            \
 515                                                                        \
 516        tstruct;                                                        \
 517                                                                        \
 518        return __data_size;                                             \
 519}
 520
 521#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 522
 523/*
 524 * Stage 4 of the trace events.
 525 *
 526 * Override the macros in the event tracepoint header <trace/events/XXX.h>
 527 * to include the following:
 528 *
 529 * For those macros defined with TRACE_EVENT:
 530 *
 531 * static struct trace_event_call event_<call>;
 532 *
 533 * static void trace_event_raw_event_<call>(void *__data, proto)
 534 * {
 535 *      struct trace_event_file *trace_file = __data;
 536 *      struct trace_event_call *event_call = trace_file->event_call;
 537 *      struct trace_event_data_offsets_<call> __maybe_unused __data_offsets;
 538 *      unsigned long eflags = trace_file->flags;
 539 *      enum event_trigger_type __tt = ETT_NONE;
 540 *      struct ring_buffer_event *event;
 541 *      struct trace_event_raw_<call> *entry; <-- defined in stage 1
 542 *      struct trace_buffer *buffer;
 543 *      unsigned long irq_flags;
 544 *      int __data_size;
 545 *      int pc;
 546 *
 547 *      if (!(eflags & EVENT_FILE_FL_TRIGGER_COND)) {
 548 *              if (eflags & EVENT_FILE_FL_TRIGGER_MODE)
 549 *                      event_triggers_call(trace_file, NULL);
 550 *              if (eflags & EVENT_FILE_FL_SOFT_DISABLED)
 551 *                      return;
 552 *      }
 553 *
 554 *      local_save_flags(irq_flags);
 555 *      pc = preempt_count();
 556 *
 557 *      __data_size = trace_event_get_offsets_<call>(&__data_offsets, args);
 558 *
 559 *      event = trace_event_buffer_lock_reserve(&buffer, trace_file,
 560 *                                event_<call>->event.type,
 561 *                                sizeof(*entry) + __data_size,
 562 *                                irq_flags, pc);
 563 *      if (!event)
 564 *              return;
 565 *      entry   = ring_buffer_event_data(event);
 566 *
 567 *      { <assign>; }  <-- Here we assign the entries by the __field and
 568 *                         __array macros.
 569 *
 570 *      if (eflags & EVENT_FILE_FL_TRIGGER_COND)
 571 *              __tt = event_triggers_call(trace_file, entry);
 572 *
 573 *      if (test_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT,
 574 *                   &trace_file->flags))
 575 *              ring_buffer_discard_commit(buffer, event);
 576 *      else if (!filter_check_discard(trace_file, entry, buffer, event))
 577 *              trace_buffer_unlock_commit(buffer, event, irq_flags, pc);
 578 *
 579 *      if (__tt)
 580 *              event_triggers_post_call(trace_file, __tt);
 581 * }
 582 *
 583 * static struct trace_event ftrace_event_type_<call> = {
 584 *      .trace                  = trace_raw_output_<call>, <-- stage 2
 585 * };
 586 *
 587 * static char print_fmt_<call>[] = <TP_printk>;
 588 *
 589 * static struct trace_event_class __used event_class_<template> = {
 590 *      .system                 = "<system>",
 591 *      .fields_array           = trace_event_fields_<call>,
 592 *      .fields                 = LIST_HEAD_INIT(event_class_##call.fields),
 593 *      .raw_init               = trace_event_raw_init,
 594 *      .probe                  = trace_event_raw_event_##call,
 595 *      .reg                    = trace_event_reg,
 596 * };
 597 *
 598 * static struct trace_event_call event_<call> = {
 599 *      .class                  = event_class_<template>,
 600 *      {
 601 *              .tp                     = &__tracepoint_<call>,
 602 *      },
 603 *      .event                  = &ftrace_event_type_<call>,
 604 *      .print_fmt              = print_fmt_<call>,
 605 *      .flags                  = TRACE_EVENT_FL_TRACEPOINT,
 606 * };
 607 * // its only safe to use pointers when doing linker tricks to
 608 * // create an array.
 609 * static struct trace_event_call __used
 610 * __attribute__((section("_ftrace_events"))) *__event_<call> = &event_<call>;
 611 *
 612 */
 613
 614#ifdef CONFIG_PERF_EVENTS
 615
 616#define _TRACE_PERF_PROTO(call, proto)                                  \
 617        static notrace void                                             \
 618        perf_trace_##call(void *__data, proto);
 619
 620#define _TRACE_PERF_INIT(call)                                          \
 621        .perf_probe             = perf_trace_##call,
 622
 623#else
 624#define _TRACE_PERF_PROTO(call, proto)
 625#define _TRACE_PERF_INIT(call)
 626#endif /* CONFIG_PERF_EVENTS */
 627
 628#undef __entry
 629#define __entry entry
 630
 631#undef __field
 632#define __field(type, item)
 633
 634#undef __field_struct
 635#define __field_struct(type, item)
 636
 637#undef __array
 638#define __array(type, item, len)
 639
 640#undef __dynamic_array
 641#define __dynamic_array(type, item, len)                                \
 642        __entry->__data_loc_##item = __data_offsets.item;
 643
 644#undef __string
 645#define __string(item, src) __dynamic_array(char, item, -1)
 646
 647#undef __assign_str
 648#define __assign_str(dst, src)                                          \
 649        strcpy(__get_str(dst), (src) ? (const char *)(src) : "(null)");
 650
 651#undef __bitmask
 652#define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item, -1)
 653
 654#undef __get_bitmask
 655#define __get_bitmask(field) (char *)__get_dynamic_array(field)
 656
 657#undef __assign_bitmask
 658#define __assign_bitmask(dst, src, nr_bits)                                     \
 659        memcpy(__get_bitmask(dst), (src), __bitmask_size_in_bytes(nr_bits))
 660
 661#undef TP_fast_assign
 662#define TP_fast_assign(args...) args
 663
 664#undef __perf_count
 665#define __perf_count(c) (c)
 666
 667#undef __perf_task
 668#define __perf_task(t)  (t)
 669
 670#undef DECLARE_EVENT_CLASS
 671#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 672                                                                        \
 673static notrace void                                                     \
 674trace_event_raw_event_##call(void *__data, proto)                       \
 675{                                                                       \
 676        struct trace_event_file *trace_file = __data;                   \
 677        struct trace_event_data_offsets_##call __maybe_unused __data_offsets;\
 678        struct trace_event_buffer fbuffer;                              \
 679        struct trace_event_raw_##call *entry;                           \
 680        int __data_size;                                                \
 681                                                                        \
 682        if (trace_trigger_soft_disabled(trace_file))                    \
 683                return;                                                 \
 684                                                                        \
 685        __data_size = trace_event_get_offsets_##call(&__data_offsets, args); \
 686                                                                        \
 687        entry = trace_event_buffer_reserve(&fbuffer, trace_file,        \
 688                                 sizeof(*entry) + __data_size);         \
 689                                                                        \
 690        if (!entry)                                                     \
 691                return;                                                 \
 692                                                                        \
 693        tstruct                                                         \
 694                                                                        \
 695        { assign; }                                                     \
 696                                                                        \
 697        trace_event_buffer_commit(&fbuffer);                            \
 698}
 699/*
 700 * The ftrace_test_probe is compiled out, it is only here as a build time check
 701 * to make sure that if the tracepoint handling changes, the ftrace probe will
 702 * fail to compile unless it too is updated.
 703 */
 704
 705#undef DEFINE_EVENT
 706#define DEFINE_EVENT(template, call, proto, args)                       \
 707static inline void ftrace_test_probe_##call(void)                       \
 708{                                                                       \
 709        check_trace_callback_type_##call(trace_event_raw_event_##template); \
 710}
 711
 712#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 713
 714#undef __entry
 715#define __entry REC
 716
 717#undef __print_flags
 718#undef __print_symbolic
 719#undef __print_hex
 720#undef __print_hex_str
 721#undef __get_dynamic_array
 722#undef __get_dynamic_array_len
 723#undef __get_str
 724#undef __get_bitmask
 725#undef __print_array
 726#undef __print_hex_dump
 727
 728#undef TP_printk
 729#define TP_printk(fmt, args...) "\"" fmt "\", "  __stringify(args)
 730
 731#undef DECLARE_EVENT_CLASS
 732#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 733_TRACE_PERF_PROTO(call, PARAMS(proto));                                 \
 734static char print_fmt_##call[] = print;                                 \
 735static struct trace_event_class __used __refdata event_class_##call = { \
 736        .system                 = TRACE_SYSTEM_STRING,                  \
 737        .fields_array           = trace_event_fields_##call,            \
 738        .fields                 = LIST_HEAD_INIT(event_class_##call.fields),\
 739        .raw_init               = trace_event_raw_init,                 \
 740        .probe                  = trace_event_raw_event_##call,         \
 741        .reg                    = trace_event_reg,                      \
 742        _TRACE_PERF_INIT(call)                                          \
 743};
 744
 745#undef DEFINE_EVENT
 746#define DEFINE_EVENT(template, call, proto, args)                       \
 747                                                                        \
 748static struct trace_event_call __used event_##call = {                  \
 749        .class                  = &event_class_##template,              \
 750        {                                                               \
 751                .tp                     = &__tracepoint_##call,         \
 752        },                                                              \
 753        .event.funcs            = &trace_event_type_funcs_##template,   \
 754        .print_fmt              = print_fmt_##template,                 \
 755        .flags                  = TRACE_EVENT_FL_TRACEPOINT,            \
 756};                                                                      \
 757static struct trace_event_call __used                                   \
 758__attribute__((section("_ftrace_events"))) *__event_##call = &event_##call
 759
 760#undef DEFINE_EVENT_PRINT
 761#define DEFINE_EVENT_PRINT(template, call, proto, args, print)          \
 762                                                                        \
 763static char print_fmt_##call[] = print;                                 \
 764                                                                        \
 765static struct trace_event_call __used event_##call = {                  \
 766        .class                  = &event_class_##template,              \
 767        {                                                               \
 768                .tp                     = &__tracepoint_##call,         \
 769        },                                                              \
 770        .event.funcs            = &trace_event_type_funcs_##call,       \
 771        .print_fmt              = print_fmt_##call,                     \
 772        .flags                  = TRACE_EVENT_FL_TRACEPOINT,            \
 773};                                                                      \
 774static struct trace_event_call __used                                   \
 775__attribute__((section("_ftrace_events"))) *__event_##call = &event_##call
 776
 777#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 778