LXR linux/include/trace/trace

   1/*
   2 * Stage 1 of the trace events.
   3 *
   4 * Override the macros in <trace/trace_events.h> to include the following:
   5 *
   6 * struct trace_event_raw_<call> {
   7 *      struct trace_entry              ent;
   8 *      <type>                          <item>;
   9 *      <type2>                         <item2>[<len>];
  10 *      [...]
  11 * };
  12 *
  13 * The <type> <item> is created by the __field(type, item) macro or
  14 * the __array(type2, item2, len) macro.
  15 * We simply do "type item;", and that will create the fields
  16 * in the structure.
  17 */
  18
  19#include <linux/trace_events.h>
  20
  21#ifndef TRACE_SYSTEM_VAR
  22#define TRACE_SYSTEM_VAR TRACE_SYSTEM
  23#endif
  24
  25#define __app__(x, y) str__##x##y
  26#define __app(x, y) __app__(x, y)
  27
  28#define TRACE_SYSTEM_STRING __app(TRACE_SYSTEM_VAR,__trace_system_name)
  29
  30#define TRACE_MAKE_SYSTEM_STR()                         \
  31        static const char TRACE_SYSTEM_STRING[] =       \
  32                __stringify(TRACE_SYSTEM)
  33
  34TRACE_MAKE_SYSTEM_STR();
  35
  36#undef TRACE_DEFINE_ENUM
  37#define TRACE_DEFINE_ENUM(a)                            \
  38        static struct trace_eval_map __used __initdata  \
  39        __##TRACE_SYSTEM##_##a =                        \
  40        {                                               \
  41                .system = TRACE_SYSTEM_STRING,          \
  42                .eval_string = #a,                      \
  43                .eval_value = a                         \
  44        };                                              \
  45        static struct trace_eval_map __used             \
  46        __attribute__((section("_ftrace_eval_map")))    \
  47        *TRACE_SYSTEM##_##a = &__##TRACE_SYSTEM##_##a
  48
  49#undef TRACE_DEFINE_SIZEOF
  50#define TRACE_DEFINE_SIZEOF(a)                          \
  51        static struct trace_eval_map __used __initdata  \
  52        __##TRACE_SYSTEM##_##a =                        \
  53        {                                               \
  54                .system = TRACE_SYSTEM_STRING,          \
  55                .eval_string = "sizeof(" #a ")",        \
  56                .eval_value = sizeof(a)                 \
  57        };                                              \
  58        static struct trace_eval_map __used             \
  59        __attribute__((section("_ftrace_eval_map")))    \
  60        *TRACE_SYSTEM##_##a = &__##TRACE_SYSTEM##_##a
  61
  62/*
  63 * DECLARE_EVENT_CLASS can be used to add a generic function
  64 * handlers for events. That is, if all events have the same
  65 * parameters and just have distinct trace points.
  66 * Each tracepoint can be defined with DEFINE_EVENT and that
  67 * will map the DECLARE_EVENT_CLASS to the tracepoint.
  68 *
  69 * TRACE_EVENT is a one to one mapping between tracepoint and template.
  70 */
  71#undef TRACE_EVENT
  72#define TRACE_EVENT(name, proto, args, tstruct, assign, print) \
  73        DECLARE_EVENT_CLASS(name,                              \
  74                             PARAMS(proto),                    \
  75                             PARAMS(args),                     \
  76                             PARAMS(tstruct),                  \
  77                             PARAMS(assign),                   \
  78                             PARAMS(print));                   \
  79        DEFINE_EVENT(name, name, PARAMS(proto), PARAMS(args));
  80
  81
  82#undef __field
  83#define __field(type, item)             type    item;
  84
  85#undef __field_ext
  86#define __field_ext(type, item, filter_type)    type    item;
  87
  88#undef __field_struct
  89#define __field_struct(type, item)      type    item;
  90
  91#undef __field_struct_ext
  92#define __field_struct_ext(type, item, filter_type)     type    item;
  93
  94#undef __array
  95#define __array(type, item, len)        type    item[len];
  96
  97#undef __dynamic_array
  98#define __dynamic_array(type, item, len) u32 __data_loc_##item;
  99
 100#undef __string
 101#define __string(item, src) __dynamic_array(char, item, -1)
 102
 103#undef __bitmask
 104#define __bitmask(item, nr_bits) __dynamic_array(char, item, -1)
 105
 106#undef TP_STRUCT__entry
 107#define TP_STRUCT__entry(args...) args
 108
 109#undef DECLARE_EVENT_CLASS
 110#define DECLARE_EVENT_CLASS(name, proto, args, tstruct, assign, print)  \
 111        struct trace_event_raw_##name {                                 \
 112                struct trace_entry      ent;                            \
 113                tstruct                                                 \
 114                char                    __data[0];                      \
 115        };                                                              \
 116                                                                        \
 117        static struct trace_event_class event_class_##name;
 118
 119#undef DEFINE_EVENT
 120#define DEFINE_EVENT(template, name, proto, args)       \
 121        static struct trace_event_call  __used          \
 122        __attribute__((__aligned__(4))) event_##name
 123
 124#undef DEFINE_EVENT_FN
 125#define DEFINE_EVENT_FN(template, name, proto, args, reg, unreg)        \
 126        DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 127
 128#undef DEFINE_EVENT_PRINT
 129#define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
 130        DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 131
 132/* Callbacks are meaningless to ftrace. */
 133#undef TRACE_EVENT_FN
 134#define TRACE_EVENT_FN(name, proto, args, tstruct,                      \
 135                assign, print, reg, unreg)                              \
 136        TRACE_EVENT(name, PARAMS(proto), PARAMS(args),                  \
 137                PARAMS(tstruct), PARAMS(assign), PARAMS(print))         \
 138
 139#undef TRACE_EVENT_FN_COND
 140#define TRACE_EVENT_FN_COND(name, proto, args, cond, tstruct,   \
 141                assign, print, reg, unreg)                              \
 142        TRACE_EVENT_CONDITION(name, PARAMS(proto), PARAMS(args), PARAMS(cond),          \
 143                PARAMS(tstruct), PARAMS(assign), PARAMS(print))         \
 144
 145#undef TRACE_EVENT_FLAGS
 146#define TRACE_EVENT_FLAGS(name, value)                                  \
 147        __TRACE_EVENT_FLAGS(name, value)
 148
 149#undef TRACE_EVENT_PERF_PERM
 150#define TRACE_EVENT_PERF_PERM(name, expr...)                            \
 151        __TRACE_EVENT_PERF_PERM(name, expr)
 152
 153#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 154
 155/*
 156 * Stage 2 of the trace events.
 157 *
 158 * Include the following:
 159 *
 160 * struct trace_event_data_offsets_<call> {
 161 *      u32                             <item1>;
 162 *      u32                             <item2>;
 163 *      [...]
 164 * };
 165 *
 166 * The __dynamic_array() macro will create each u32 <item>, this is
 167 * to keep the offset of each array from the beginning of the event.
 168 * The size of an array is also encoded, in the higher 16 bits of <item>.
 169 */
 170
 171#undef TRACE_DEFINE_ENUM
 172#define TRACE_DEFINE_ENUM(a)
 173
 174#undef TRACE_DEFINE_SIZEOF
 175#define TRACE_DEFINE_SIZEOF(a)
 176
 177#undef __field
 178#define __field(type, item)
 179
 180#undef __field_ext
 181#define __field_ext(type, item, filter_type)
 182
 183#undef __field_struct
 184#define __field_struct(type, item)
 185
 186#undef __field_struct_ext
 187#define __field_struct_ext(type, item, filter_type)
 188
 189#undef __array
 190#define __array(type, item, len)
 191
 192#undef __dynamic_array
 193#define __dynamic_array(type, item, len)        u32 item;
 194
 195#undef __string
 196#define __string(item, src) __dynamic_array(char, item, -1)
 197
 198#undef __bitmask
 199#define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item, -1)
 200
 201#undef DECLARE_EVENT_CLASS
 202#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 203        struct trace_event_data_offsets_##call {                        \
 204                tstruct;                                                \
 205        };
 206
 207#undef DEFINE_EVENT
 208#define DEFINE_EVENT(template, name, proto, args)
 209
 210#undef DEFINE_EVENT_PRINT
 211#define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
 212        DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 213
 214#undef TRACE_EVENT_FLAGS
 215#define TRACE_EVENT_FLAGS(event, flag)
 216
 217#undef TRACE_EVENT_PERF_PERM
 218#define TRACE_EVENT_PERF_PERM(event, expr...)
 219
 220#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 221
 222/*
 223 * Stage 3 of the trace events.
 224 *
 225 * Override the macros in <trace/trace_events.h> to include the following:
 226 *
 227 * enum print_line_t
 228 * trace_raw_output_<call>(struct trace_iterator *iter, int flags)
 229 * {
 230 *      struct trace_seq *s = &iter->seq;
 231 *      struct trace_event_raw_<call> *field; <-- defined in stage 1
 232 *      struct trace_entry *entry;
 233 *      struct trace_seq *p = &iter->tmp_seq;
 234 *      int ret;
 235 *
 236 *      entry = iter->ent;
 237 *
 238 *      if (entry->type != event_<call>->event.type) {
 239 *              WARN_ON_ONCE(1);
 240 *              return TRACE_TYPE_UNHANDLED;
 241 *      }
 242 *
 243 *      field = (typeof(field))entry;
 244 *
 245 *      trace_seq_init(p);
 246 *      ret = trace_seq_printf(s, "%s: ", <call>);
 247 *      if (ret)
 248 *              ret = trace_seq_printf(s, <TP_printk> "\n");
 249 *      if (!ret)
 250 *              return TRACE_TYPE_PARTIAL_LINE;
 251 *
 252 *      return TRACE_TYPE_HANDLED;
 253 * }
 254 *
 255 * This is the method used to print the raw event to the trace
 256 * output format. Note, this is not needed if the data is read
 257 * in binary.
 258 */
 259
 260#undef __entry
 261#define __entry field
 262
 263#undef TP_printk
 264#define TP_printk(fmt, args...) fmt "\n", args
 265
 266#undef __get_dynamic_array
 267#define __get_dynamic_array(field)      \
 268                ((void *)__entry + (__entry->__data_loc_##field & 0xffff))
 269
 270#undef __get_dynamic_array_len
 271#define __get_dynamic_array_len(field)  \
 272                ((__entry->__data_loc_##field >> 16) & 0xffff)
 273
 274#undef __get_str
 275#define __get_str(field) ((char *)__get_dynamic_array(field))
 276
 277#undef __get_bitmask
 278#define __get_bitmask(field)                                            \
 279        ({                                                              \
 280                void *__bitmask = __get_dynamic_array(field);           \
 281                unsigned int __bitmask_size;                            \
 282                __bitmask_size = __get_dynamic_array_len(field);        \
 283                trace_print_bitmask_seq(p, __bitmask, __bitmask_size);  \
 284        })
 285
 286#undef __print_flags
 287#define __print_flags(flag, delim, flag_array...)                       \
 288        ({                                                              \
 289                static const struct trace_print_flags __flags[] =       \
 290                        { flag_array, { -1, NULL }};                    \
 291                trace_print_flags_seq(p, delim, flag, __flags); \
 292        })
 293
 294#undef __print_symbolic
 295#define __print_symbolic(value, symbol_array...)                        \
 296        ({                                                              \
 297                static const struct trace_print_flags symbols[] =       \
 298                        { symbol_array, { -1, NULL }};                  \
 299                trace_print_symbols_seq(p, value, symbols);             \
 300        })
 301
 302#undef __print_flags_u64
 303#undef __print_symbolic_u64
 304#if BITS_PER_LONG == 32
 305#define __print_flags_u64(flag, delim, flag_array...)                   \
 306        ({                                                              \
 307                static const struct trace_print_flags_u64 __flags[] =   \
 308                        { flag_array, { -1, NULL } };                   \
 309                trace_print_flags_seq_u64(p, delim, flag, __flags);     \
 310        })
 311
 312#define __print_symbolic_u64(value, symbol_array...)                    \
 313        ({                                                              \
 314                static const struct trace_print_flags_u64 symbols[] =   \
 315                        { symbol_array, { -1, NULL } };                 \
 316                trace_print_symbols_seq_u64(p, value, symbols); \
 317        })
 318#else
 319#define __print_flags_u64(flag, delim, flag_array...)                   \
 320                        __print_flags(flag, delim, flag_array)
 321
 322#define __print_symbolic_u64(value, symbol_array...)                    \
 323                        __print_symbolic(value, symbol_array)
 324#endif
 325
 326#undef __print_hex
 327#define __print_hex(buf, buf_len)                                       \
 328        trace_print_hex_seq(p, buf, buf_len, false)
 329
 330#undef __print_hex_str
 331#define __print_hex_str(buf, buf_len)                                   \
 332        trace_print_hex_seq(p, buf, buf_len, true)
 333
 334#undef __print_array
 335#define __print_array(array, count, el_size)                            \
 336        ({                                                              \
 337                BUILD_BUG_ON(el_size != 1 && el_size != 2 &&            \
 338                             el_size != 4 && el_size != 8);             \
 339                trace_print_array_seq(p, array, count, el_size);        \
 340        })
 341
 342#undef DECLARE_EVENT_CLASS
 343#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 344static notrace enum print_line_t                                        \
 345trace_raw_output_##call(struct trace_iterator *iter, int flags,         \
 346                        struct trace_event *trace_event)                \
 347{                                                                       \
 348        struct trace_seq *s = &iter->seq;                               \
 349        struct trace_seq __maybe_unused *p = &iter->tmp_seq;            \
 350        struct trace_event_raw_##call *field;                           \
 351        int ret;                                                        \
 352                                                                        \
 353        field = (typeof(field))iter->ent;                               \
 354                                                                        \
 355        ret = trace_raw_output_prep(iter, trace_event);                 \
 356        if (ret != TRACE_TYPE_HANDLED)                                  \
 357                return ret;                                             \
 358                                                                        \
 359        trace_seq_printf(s, print);                                     \
 360                                                                        \
 361        return trace_handle_return(s);                                  \
 362}                                                                       \
 363static struct trace_event_functions trace_event_type_funcs_##call = {   \
 364        .trace                  = trace_raw_output_##call,              \
 365};
 366
 367#undef DEFINE_EVENT_PRINT
 368#define DEFINE_EVENT_PRINT(template, call, proto, args, print)          \
 369static notrace enum print_line_t                                        \
 370trace_raw_output_##call(struct trace_iterator *iter, int flags,         \
 371                         struct trace_event *event)                     \
 372{                                                                       \
 373        struct trace_event_raw_##template *field;                       \
 374        struct trace_entry *entry;                                      \
 375        struct trace_seq *p = &iter->tmp_seq;                           \
 376                                                                        \
 377        entry = iter->ent;                                              \
 378                                                                        \
 379        if (entry->type != event_##call.event.type) {                   \
 380                WARN_ON_ONCE(1);                                        \
 381                return TRACE_TYPE_UNHANDLED;                            \
 382        }                                                               \
 383                                                                        \
 384        field = (typeof(field))entry;                                   \
 385                                                                        \
 386        trace_seq_init(p);                                              \
 387        return trace_output_call(iter, #call, print);                   \
 388}                                                                       \
 389static struct trace_event_functions trace_event_type_funcs_##call = {   \
 390        .trace                  = trace_raw_output_##call,              \
 391};
 392
 393#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 394
 395#undef __field_ext
 396#define __field_ext(type, item, filter_type)                            \
 397        ret = trace_define_field(event_call, #type, #item,              \
 398                                 offsetof(typeof(field), item),         \
 399                                 sizeof(field.item),                    \
 400                                 is_signed_type(type), filter_type);    \
 401        if (ret)                                                        \
 402                return ret;
 403
 404#undef __field_struct_ext
 405#define __field_struct_ext(type, item, filter_type)                     \
 406        ret = trace_define_field(event_call, #type, #item,              \
 407                                 offsetof(typeof(field), item),         \
 408                                 sizeof(field.item),                    \
 409                                 0, filter_type);                       \
 410        if (ret)                                                        \
 411                return ret;
 412
 413#undef __field
 414#define __field(type, item)     __field_ext(type, item, FILTER_OTHER)
 415
 416#undef __field_struct
 417#define __field_struct(type, item) __field_struct_ext(type, item, FILTER_OTHER)
 418
 419#undef __array
 420#define __array(type, item, len)                                        \
 421        do {                                                            \
 422                char *type_str = #type"["__stringify(len)"]";           \
 423                BUILD_BUG_ON(len > MAX_FILTER_STR_VAL);                 \
 424                ret = trace_define_field(event_call, type_str, #item,   \
 425                                 offsetof(typeof(field), item),         \
 426                                 sizeof(field.item),                    \
 427                                 is_signed_type(type), FILTER_OTHER);   \
 428                if (ret)                                                \
 429                        return ret;                                     \
 430        } while (0);
 431
 432#undef __dynamic_array
 433#define __dynamic_array(type, item, len)                                       \
 434        ret = trace_define_field(event_call, "__data_loc " #type "[]", #item,  \
 435                                 offsetof(typeof(field), __data_loc_##item),   \
 436                                 sizeof(field.__data_loc_##item),              \
 437                                 is_signed_type(type), FILTER_OTHER);
 438
 439#undef __string
 440#define __string(item, src) __dynamic_array(char, item, -1)
 441
 442#undef __bitmask
 443#define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item, -1)
 444
 445#undef DECLARE_EVENT_CLASS
 446#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, func, print)    \
 447static int notrace __init                                               \
 448trace_event_define_fields_##call(struct trace_event_call *event_call)   \
 449{                                                                       \
 450        struct trace_event_raw_##call field;                            \
 451        int ret;                                                        \
 452                                                                        \
 453        tstruct;                                                        \
 454                                                                        \
 455        return ret;                                                     \
 456}
 457
 458#undef DEFINE_EVENT
 459#define DEFINE_EVENT(template, name, proto, args)
 460
 461#undef DEFINE_EVENT_PRINT
 462#define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
 463        DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 464
 465#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 466
 467/*
 468 * remember the offset of each array from the beginning of the event.
 469 */
 470
 471#undef __entry
 472#define __entry entry
 473
 474#undef __field
 475#define __field(type, item)
 476
 477#undef __field_ext
 478#define __field_ext(type, item, filter_type)
 479
 480#undef __field_struct
 481#define __field_struct(type, item)
 482
 483#undef __field_struct_ext
 484#define __field_struct_ext(type, item, filter_type)
 485
 486#undef __array
 487#define __array(type, item, len)
 488
 489#undef __dynamic_array
 490#define __dynamic_array(type, item, len)                                \
 491        __item_length = (len) * sizeof(type);                           \
 492        __data_offsets->item = __data_size +                            \
 493                               offsetof(typeof(*entry), __data);        \
 494        __data_offsets->item |= __item_length << 16;                    \
 495        __data_size += __item_length;
 496
 497#undef __string
 498#define __string(item, src) __dynamic_array(char, item,                 \
 499                    strlen((src) ? (const char *)(src) : "(null)") + 1)
 500
 501/*
 502 * __bitmask_size_in_bytes_raw is the number of bytes needed to hold
 503 * num_possible_cpus().
 504 */
 505#define __bitmask_size_in_bytes_raw(nr_bits)    \
 506        (((nr_bits) + 7) / 8)
 507
 508#define __bitmask_size_in_longs(nr_bits)                        \
 509        ((__bitmask_size_in_bytes_raw(nr_bits) +                \
 510          ((BITS_PER_LONG / 8) - 1)) / (BITS_PER_LONG / 8))
 511
 512/*
 513 * __bitmask_size_in_bytes is the number of bytes needed to hold
 514 * num_possible_cpus() padded out to the nearest long. This is what
 515 * is saved in the buffer, just to be consistent.
 516 */
 517#define __bitmask_size_in_bytes(nr_bits)                                \
 518        (__bitmask_size_in_longs(nr_bits) * (BITS_PER_LONG / 8))
 519
 520#undef __bitmask
 521#define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item,   \
 522                                         __bitmask_size_in_longs(nr_bits))
 523
 524#undef DECLARE_EVENT_CLASS
 525#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 526static inline notrace int trace_event_get_offsets_##call(               \
 527        struct trace_event_data_offsets_##call *__data_offsets, proto)  \
 528{                                                                       \
 529        int __data_size = 0;                                            \
 530        int __maybe_unused __item_length;                               \
 531        struct trace_event_raw_##call __maybe_unused *entry;            \
 532                                                                        \
 533        tstruct;                                                        \
 534                                                                        \
 535        return __data_size;                                             \
 536}
 537
 538#undef DEFINE_EVENT
 539#define DEFINE_EVENT(template, name, proto, args)
 540
 541#undef DEFINE_EVENT_PRINT
 542#define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
 543        DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 544
 545#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 546
 547/*
 548 * Stage 4 of the trace events.
 549 *
 550 * Override the macros in <trace/trace_events.h> to include the following:
 551 *
 552 * For those macros defined with TRACE_EVENT:
 553 *
 554 * static struct trace_event_call event_<call>;
 555 *
 556 * static void trace_event_raw_event_<call>(void *__data, proto)
 557 * {
 558 *      struct trace_event_file *trace_file = __data;
 559 *      struct trace_event_call *event_call = trace_file->event_call;
 560 *      struct trace_event_data_offsets_<call> __maybe_unused __data_offsets;
 561 *      unsigned long eflags = trace_file->flags;
 562 *      enum event_trigger_type __tt = ETT_NONE;
 563 *      struct ring_buffer_event *event;
 564 *      struct trace_event_raw_<call> *entry; <-- defined in stage 1
 565 *      struct ring_buffer *buffer;
 566 *      unsigned long irq_flags;
 567 *      int __data_size;
 568 *      int pc;
 569 *
 570 *      if (!(eflags & EVENT_FILE_FL_TRIGGER_COND)) {
 571 *              if (eflags & EVENT_FILE_FL_TRIGGER_MODE)
 572 *                      event_triggers_call(trace_file, NULL);
 573 *              if (eflags & EVENT_FILE_FL_SOFT_DISABLED)
 574 *                      return;
 575 *      }
 576 *
 577 *      local_save_flags(irq_flags);
 578 *      pc = preempt_count();
 579 *
 580 *      __data_size = trace_event_get_offsets_<call>(&__data_offsets, args);
 581 *
 582 *      event = trace_event_buffer_lock_reserve(&buffer, trace_file,
 583 *                                event_<call>->event.type,
 584 *                                sizeof(*entry) + __data_size,
 585 *                                irq_flags, pc);
 586 *      if (!event)
 587 *              return;
 588 *      entry   = ring_buffer_event_data(event);
 589 *
 590 *      { <assign>; }  <-- Here we assign the entries by the __field and
 591 *                         __array macros.
 592 *
 593 *      if (eflags & EVENT_FILE_FL_TRIGGER_COND)
 594 *              __tt = event_triggers_call(trace_file, entry);
 595 *
 596 *      if (test_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT,
 597 *                   &trace_file->flags))
 598 *              ring_buffer_discard_commit(buffer, event);
 599 *      else if (!filter_check_discard(trace_file, entry, buffer, event))
 600 *              trace_buffer_unlock_commit(buffer, event, irq_flags, pc);
 601 *
 602 *      if (__tt)
 603 *              event_triggers_post_call(trace_file, __tt);
 604 * }
 605 *
 606 * static struct trace_event ftrace_event_type_<call> = {
 607 *      .trace                  = trace_raw_output_<call>, <-- stage 2
 608 * };
 609 *
 610 * static char print_fmt_<call>[] = <TP_printk>;
 611 *
 612 * static struct trace_event_class __used event_class_<template> = {
 613 *      .system                 = "<system>",
 614 *      .define_fields          = trace_event_define_fields_<call>,
 615 *      .fields                 = LIST_HEAD_INIT(event_class_##call.fields),
 616 *      .raw_init               = trace_event_raw_init,
 617 *      .probe                  = trace_event_raw_event_##call,
 618 *      .reg                    = trace_event_reg,
 619 * };
 620 *
 621 * static struct trace_event_call event_<call> = {
 622 *      .class                  = event_class_<template>,
 623 *      {
 624 *              .tp                     = &__tracepoint_<call>,
 625 *      },
 626 *      .event                  = &ftrace_event_type_<call>,
 627 *      .print_fmt              = print_fmt_<call>,
 628 *      .flags                  = TRACE_EVENT_FL_TRACEPOINT,
 629 * };
 630 * // its only safe to use pointers when doing linker tricks to
 631 * // create an array.
 632 * static struct trace_event_call __used
 633 * __attribute__((section("_ftrace_events"))) *__event_<call> = &event_<call>;
 634 *
 635 */
 636
 637#ifdef CONFIG_PERF_EVENTS
 638
 639#define _TRACE_PERF_PROTO(call, proto)                                  \
 640        static notrace void                                             \
 641        perf_trace_##call(void *__data, proto);
 642
 643#define _TRACE_PERF_INIT(call)                                          \
 644        .perf_probe             = perf_trace_##call,
 645
 646#else
 647#define _TRACE_PERF_PROTO(call, proto)
 648#define _TRACE_PERF_INIT(call)
 649#endif /* CONFIG_PERF_EVENTS */
 650
 651#undef __entry
 652#define __entry entry
 653
 654#undef __field
 655#define __field(type, item)
 656
 657#undef __field_struct
 658#define __field_struct(type, item)
 659
 660#undef __array
 661#define __array(type, item, len)
 662
 663#undef __dynamic_array
 664#define __dynamic_array(type, item, len)                                \
 665        __entry->__data_loc_##item = __data_offsets.item;
 666
 667#undef __string
 668#define __string(item, src) __dynamic_array(char, item, -1)
 669
 670#undef __assign_str
 671#define __assign_str(dst, src)                                          \
 672        strcpy(__get_str(dst), (src) ? (const char *)(src) : "(null)");
 673
 674#undef __bitmask
 675#define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item, -1)
 676
 677#undef __get_bitmask
 678#define __get_bitmask(field) (char *)__get_dynamic_array(field)
 679
 680#undef __assign_bitmask
 681#define __assign_bitmask(dst, src, nr_bits)                                     \
 682        memcpy(__get_bitmask(dst), (src), __bitmask_size_in_bytes(nr_bits))
 683
 684#undef TP_fast_assign
 685#define TP_fast_assign(args...) args
 686
 687#undef __perf_count
 688#define __perf_count(c) (c)
 689
 690#undef __perf_task
 691#define __perf_task(t)  (t)
 692
 693#undef DECLARE_EVENT_CLASS
 694#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 695                                                                        \
 696static notrace void                                                     \
 697trace_event_raw_event_##call(void *__data, proto)                       \
 698{                                                                       \
 699        struct trace_event_file *trace_file = __data;                   \
 700        struct trace_event_data_offsets_##call __maybe_unused __data_offsets;\
 701        struct trace_event_buffer fbuffer;                              \
 702        struct trace_event_raw_##call *entry;                           \
 703        int __data_size;                                                \
 704                                                                        \
 705        if (trace_trigger_soft_disabled(trace_file))                    \
 706                return;                                                 \
 707                                                                        \
 708        __data_size = trace_event_get_offsets_##call(&__data_offsets, args); \
 709                                                                        \
 710        entry = trace_event_buffer_reserve(&fbuffer, trace_file,        \
 711                                 sizeof(*entry) + __data_size);         \
 712                                                                        \
 713        if (!entry)                                                     \
 714                return;                                                 \
 715                                                                        \
 716        tstruct                                                         \
 717                                                                        \
 718        { assign; }                                                     \
 719                                                                        \
 720        trace_event_buffer_commit(&fbuffer);                            \
 721}
 722/*
 723 * The ftrace_test_probe is compiled out, it is only here as a build time check
 724 * to make sure that if the tracepoint handling changes, the ftrace probe will
 725 * fail to compile unless it too is updated.
 726 */
 727
 728#undef DEFINE_EVENT
 729#define DEFINE_EVENT(template, call, proto, args)                       \
 730static inline void ftrace_test_probe_##call(void)                       \
 731{                                                                       \
 732        check_trace_callback_type_##call(trace_event_raw_event_##template); \
 733}
 734
 735#undef DEFINE_EVENT_PRINT
 736#define DEFINE_EVENT_PRINT(template, name, proto, args, print)
 737
 738#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 739
 740#undef __entry
 741#define __entry REC
 742
 743#undef __print_flags
 744#undef __print_symbolic
 745#undef __print_hex
 746#undef __print_hex_str
 747#undef __get_dynamic_array
 748#undef __get_dynamic_array_len
 749#undef __get_str
 750#undef __get_bitmask
 751#undef __print_array
 752
 753#undef TP_printk
 754#define TP_printk(fmt, args...) "\"" fmt "\", "  __stringify(args)
 755
 756#undef DECLARE_EVENT_CLASS
 757#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 758_TRACE_PERF_PROTO(call, PARAMS(proto));                                 \
 759static char print_fmt_##call[] = print;                                 \
 760static struct trace_event_class __used __refdata event_class_##call = { \
 761        .system                 = TRACE_SYSTEM_STRING,                  \
 762        .define_fields          = trace_event_define_fields_##call,     \
 763        .fields                 = LIST_HEAD_INIT(event_class_##call.fields),\
 764        .raw_init               = trace_event_raw_init,                 \
 765        .probe                  = trace_event_raw_event_##call,         \
 766        .reg                    = trace_event_reg,                      \
 767        _TRACE_PERF_INIT(call)                                          \
 768};
 769
 770#undef DEFINE_EVENT
 771#define DEFINE_EVENT(template, call, proto, args)                       \
 772                                                                        \
 773static struct trace_event_call __used event_##call = {                  \
 774        .class                  = &event_class_##template,              \
 775        {                                                               \
 776                .tp                     = &__tracepoint_##call,         \
 777        },                                                              \
 778        .event.funcs            = &trace_event_type_funcs_##template,   \
 779        .print_fmt              = print_fmt_##template,                 \
 780        .flags                  = TRACE_EVENT_FL_TRACEPOINT,            \
 781};                                                                      \
 782static struct trace_event_call __used                                   \
 783__attribute__((section("_ftrace_events"))) *__event_##call = &event_##call
 784
 785#undef DEFINE_EVENT_PRINT
 786#define DEFINE_EVENT_PRINT(template, call, proto, args, print)          \
 787                                                                        \
 788static char print_fmt_##call[] = print;                                 \
 789                                                                        \
 790static struct trace_event_call __used event_##call = {                  \
 791        .class                  = &event_class_##template,              \
 792        {                                                               \
 793                .tp                     = &__tracepoint_##call,         \
 794        },                                                              \
 795        .event.funcs            = &trace_event_type_funcs_##call,       \
 796        .print_fmt              = print_fmt_##call,                     \
 797        .flags                  = TRACE_EVENT_FL_TRACEPOINT,            \
 798};                                                                      \
 799static struct trace_event_call __used                                   \
 800__attribute__((section("_ftrace_events"))) *__event_##call = &event_##call
 801
 802#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 803