include/trace/ftrace.h

   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 ftrace_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/ftrace_event.h>
  20
  21 /*
  22  * DECLARE_EVENT_CLASS can be used to add a generic function
  23  * handlers for events. That is, if all events have the same
  24  * parameters and just have distinct trace points.
  25  * Each tracepoint can be defined with DEFINE_EVENT and that
  26  * will map the DECLARE_EVENT_CLASS to the tracepoint.
  27  *
  28  * TRACE_EVENT is a one to one mapping between tracepoint and template.
  29  */
  30 #undef TRACE_EVENT
  31 #define TRACE_EVENT(name, proto, args, tstruct, assign, print) \
  32         DECLARE_EVENT_CLASS(name,                              \
  33                              PARAMS(proto),                    \
  34                              PARAMS(args),                     \
  35                              PARAMS(tstruct),                  \
  36                              PARAMS(assign),                   \
  37                              PARAMS(print));                   \
  38         DEFINE_EVENT(name, name, PARAMS(proto), PARAMS(args));
  39
  40
  41 #undef __field
  42 #define __field(type, item)             type    item;
  43
  44 #undef __field_ext
  45 #define __field_ext(type, item, filter_type)    type    item;
  46
  47 #undef __array
  48 #define __array(type, item, len)        type    item[len];
  49
  50 #undef __dynamic_array
  51 #define __dynamic_array(type, item, len) u32 __data_loc_##item;
  52
  53 #undef __string
  54 #define __string(item, src) __dynamic_array(char, item, -1)
  55
  56 #undef TP_STRUCT__entry
  57 #define TP_STRUCT__entry(args...) args
  58
  59 #undef DECLARE_EVENT_CLASS
  60 #define DECLARE_EVENT_CLASS(name, proto, args, tstruct, assign, print)  \
  61         struct ftrace_raw_##name {                                      \
  62                 struct trace_entry      ent;                            \
  63                 tstruct                                                 \
  64                 char                    __data[0];                      \
  65         };                                                              \
  66                                                                         \
  67         static struct ftrace_event_class event_class_##name;
  68
  69 #undef DEFINE_EVENT
  70 #define DEFINE_EVENT(template, name, proto, args)       \
  71         static struct ftrace_event_call __used          \
  72         __attribute__((__aligned__(4))) event_##name
  73
  74 #undef DEFINE_EVENT_FN
  75 #define DEFINE_EVENT_FN(template, name, proto, args, reg, unreg)        \
  76         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
  77
  78 #undef DEFINE_EVENT_PRINT
  79 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
  80         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
  81
  82 /* Callbacks are meaningless to ftrace. */
  83 #undef TRACE_EVENT_FN
  84 #define TRACE_EVENT_FN(name, proto, args, tstruct,                      \
  85                 assign, print, reg, unreg)                              \
  86         TRACE_EVENT(name, PARAMS(proto), PARAMS(args),                  \
  87                 PARAMS(tstruct), PARAMS(assign), PARAMS(print))         \
  88
  89 #undef TRACE_EVENT_FLAGS
  90 #define TRACE_EVENT_FLAGS(name, value)                                  \
  91         __TRACE_EVENT_FLAGS(name, value)
  92
  93 #undef TRACE_EVENT_PERF_PERM
  94 #define TRACE_EVENT_PERF_PERM(name, expr...)                            \
  95         __TRACE_EVENT_PERF_PERM(name, expr)
  96
  97 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
  98
  99
 100 /*
 101  * Stage 2 of the trace events.
 102  *
 103  * Include the following:
 104  *
 105  * struct ftrace_data_offsets_<call> {
 106  *      u32                             <item1>;
 107  *      u32                             <item2>;
 108  *      [...]
 109  * };
 110  *
 111  * The __dynamic_array() macro will create each u32 <item>, this is
 112  * to keep the offset of each array from the beginning of the event.
 113  * The size of an array is also encoded, in the higher 16 bits of <item>.
 114  */
 115
 116 #undef __field
 117 #define __field(type, item)
 118
 119 #undef __field_ext
 120 #define __field_ext(type, item, filter_type)
 121
 122 #undef __array
 123 #define __array(type, item, len)
 124
 125 #undef __dynamic_array
 126 #define __dynamic_array(type, item, len)        u32 item;
 127
 128 #undef __string
 129 #define __string(item, src) __dynamic_array(char, item, -1)
 130
 131 #undef DECLARE_EVENT_CLASS
 132 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 133         struct ftrace_data_offsets_##call {                             \
 134                 tstruct;                                                \
 135         };
 136
 137 #undef DEFINE_EVENT
 138 #define DEFINE_EVENT(template, name, proto, args)
 139
 140 #undef DEFINE_EVENT_PRINT
 141 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
 142         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 143
 144 #undef TRACE_EVENT_FLAGS
 145 #define TRACE_EVENT_FLAGS(event, flag)
 146
 147 #undef TRACE_EVENT_PERF_PERM
 148 #define TRACE_EVENT_PERF_PERM(event, expr...)
 149
 150 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 151
 152 /*
 153  * Stage 3 of the trace events.
 154  *
 155  * Override the macros in <trace/trace_events.h> to include the following:
 156  *
 157  * enum print_line_t
 158  * ftrace_raw_output_<call>(struct trace_iterator *iter, int flags)
 159  * {
 160  *      struct trace_seq *s = &iter->seq;
 161  *      struct ftrace_raw_<call> *field; <-- defined in stage 1
 162  *      struct trace_entry *entry;
 163  *      struct trace_seq *p = &iter->tmp_seq;
 164  *      int ret;
 165  *
 166  *      entry = iter->ent;
 167  *
 168  *      if (entry->type != event_<call>->event.type) {
 169  *              WARN_ON_ONCE(1);
 170  *              return TRACE_TYPE_UNHANDLED;
 171  *      }
 172  *
 173  *      field = (typeof(field))entry;
 174  *
 175  *      trace_seq_init(p);
 176  *      ret = trace_seq_printf(s, "%s: ", <call>);
 177  *      if (ret)
 178  *              ret = trace_seq_printf(s, <TP_printk> "\n");
 179  *      if (!ret)
 180  *              return TRACE_TYPE_PARTIAL_LINE;
 181  *
 182  *      return TRACE_TYPE_HANDLED;
 183  * }
 184  *
 185  * This is the method used to print the raw event to the trace
 186  * output format. Note, this is not needed if the data is read
 187  * in binary.
 188  */
 189
 190 #undef __entry
 191 #define __entry field
 192
 193 #undef TP_printk
 194 #define TP_printk(fmt, args...) fmt "\n", args
 195
 196 #undef __get_dynamic_array
 197 #define __get_dynamic_array(field)      \
 198                 ((void *)__entry + (__entry->__data_loc_##field & 0xffff))
 199
 200 #undef __get_str
 201 #define __get_str(field) (char *)__get_dynamic_array(field)
 202
 203 #undef __print_flags
 204 #define __print_flags(flag, delim, flag_array...)                       \
 205         ({                                                              \
 206                 static const struct trace_print_flags __flags[] =       \
 207                         { flag_array, { -1, NULL }};                    \
 208                 ftrace_print_flags_seq(p, delim, flag, __flags);        \
 209         })
 210
 211 #undef __print_symbolic
 212 #define __print_symbolic(value, symbol_array...)                        \
 213         ({                                                              \
 214                 static const struct trace_print_flags symbols[] =       \
 215                         { symbol_array, { -1, NULL }};                  \
 216                 ftrace_print_symbols_seq(p, value, symbols);            \
 217         })
 218
 219 #undef __print_symbolic_u64
 220 #if BITS_PER_LONG == 32
 221 #define __print_symbolic_u64(value, symbol_array...)                    \
 222         ({                                                              \
 223                 static const struct trace_print_flags_u64 symbols[] =   \
 224                         { symbol_array, { -1, NULL } };                 \
 225                 ftrace_print_symbols_seq_u64(p, value, symbols);        \
 226         })
 227 #else
 228 #define __print_symbolic_u64(value, symbol_array...)                    \
 229                         __print_symbolic(value, symbol_array)
 230 #endif
 231
 232 #undef __print_hex
 233 #define __print_hex(buf, buf_len) ftrace_print_hex_seq(p, buf, buf_len)
 234
 235 #undef DECLARE_EVENT_CLASS
 236 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 237 static notrace enum print_line_t                                        \
 238 ftrace_raw_output_##call(struct trace_iterator *iter, int flags,        \
 239                          struct trace_event *trace_event)               \
 240 {                                                                       \
 241         struct trace_seq *s = &iter->seq;                               \
 242         struct trace_seq __maybe_unused *p = &iter->tmp_seq;            \
 243         struct ftrace_raw_##call *field;                                \
 244         int ret;                                                        \
 245                                                                         \
 246         field = (typeof(field))iter->ent;                               \
 247                                                                         \
 248         ret = ftrace_raw_output_prep(iter, trace_event);                \
 249         if (ret)                                                        \
 250                 return ret;                                             \
 251                                                                         \
 252         ret = trace_seq_printf(s, print);                               \
 253         if (!ret)                                                       \
 254                 return TRACE_TYPE_PARTIAL_LINE;                         \
 255                                                                         \
 256         return TRACE_TYPE_HANDLED;                                      \
 257 }                                                                       \
 258 static struct trace_event_functions ftrace_event_type_funcs_##call = {  \
 259         .trace                  = ftrace_raw_output_##call,             \
 260 };
 261
 262 #undef DEFINE_EVENT_PRINT
 263 #define DEFINE_EVENT_PRINT(template, call, proto, args, print)          \
 264 static notrace enum print_line_t                                        \
 265 ftrace_raw_output_##call(struct trace_iterator *iter, int flags,        \
 266                          struct trace_event *event)                     \
 267 {                                                                       \
 268         struct trace_seq *s = &iter->seq;                               \
 269         struct ftrace_raw_##template *field;                            \
 270         struct trace_entry *entry;                                      \
 271         struct trace_seq *p = &iter->tmp_seq;                           \
 272         int ret;                                                        \
 273                                                                         \
 274         entry = iter->ent;                                              \
 275                                                                         \
 276         if (entry->type != event_##call.event.type) {                   \
 277                 WARN_ON_ONCE(1);                                        \
 278                 return TRACE_TYPE_UNHANDLED;                            \
 279         }                                                               \
 280                                                                         \
 281         field = (typeof(field))entry;                                   \
 282                                                                         \
 283         trace_seq_init(p);                                              \
 284         ret = trace_seq_printf(s, "%s: ", #call);                       \
 285         if (ret)                                                        \
 286                 ret = trace_seq_printf(s, print);                       \
 287         if (!ret)                                                       \
 288                 return TRACE_TYPE_PARTIAL_LINE;                         \
 289                                                                         \
 290         return TRACE_TYPE_HANDLED;                                      \
 291 }                                                                       \
 292 static struct trace_event_functions ftrace_event_type_funcs_##call = {  \
 293         .trace                  = ftrace_raw_output_##call,             \
 294 };
 295
 296 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 297
 298 #undef __field_ext
 299 #define __field_ext(type, item, filter_type)                            \
 300         ret = trace_define_field(event_call, #type, #item,              \
 301                                  offsetof(typeof(field), item),         \
 302                                  sizeof(field.item),                    \
 303                                  is_signed_type(type), filter_type);    \
 304         if (ret)                                                        \
 305                 return ret;
 306
 307 #undef __field
 308 #define __field(type, item)     __field_ext(type, item, FILTER_OTHER)
 309
 310 #undef __array
 311 #define __array(type, item, len)                                        \
 312         do {                                                            \
 313                 mutex_lock(&event_storage_mutex);                       \
 314                 BUILD_BUG_ON(len > MAX_FILTER_STR_VAL);                 \
 315                 snprintf(event_storage, sizeof(event_storage),          \
 316                          "%s[%d]", #type, len);                         \
 317                 ret = trace_define_field(event_call, event_storage, #item, \
 318                                  offsetof(typeof(field), item),         \
 319                                  sizeof(field.item),                    \
 320                                  is_signed_type(type), FILTER_OTHER);   \
 321                 mutex_unlock(&event_storage_mutex);                     \
 322                 if (ret)                                                \
 323                         return ret;                                     \
 324         } while (0);
 325
 326 #undef __dynamic_array
 327 #define __dynamic_array(type, item, len)                                       \
 328         ret = trace_define_field(event_call, "__data_loc " #type "[]", #item,  \
 329                                  offsetof(typeof(field), __data_loc_##item),   \
 330                                  sizeof(field.__data_loc_##item),              \
 331                                  is_signed_type(type), FILTER_OTHER);
 332
 333 #undef __string
 334 #define __string(item, src) __dynamic_array(char, item, -1)
 335
 336 #undef DECLARE_EVENT_CLASS
 337 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, func, print)    \
 338 static int notrace __init                                               \
 339 ftrace_define_fields_##call(struct ftrace_event_call *event_call)       \
 340 {                                                                       \
 341         struct ftrace_raw_##call field;                                 \
 342         int ret;                                                        \
 343                                                                         \
 344         tstruct;                                                        \
 345                                                                         \
 346         return ret;                                                     \
 347 }
 348
 349 #undef DEFINE_EVENT
 350 #define DEFINE_EVENT(template, name, proto, args)
 351
 352 #undef DEFINE_EVENT_PRINT
 353 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
 354         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 355
 356 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 357
 358 /*
 359  * remember the offset of each array from the beginning of the event.
 360  */
 361
 362 #undef __entry
 363 #define __entry entry
 364
 365 #undef __field
 366 #define __field(type, item)
 367
 368 #undef __field_ext
 369 #define __field_ext(type, item, filter_type)
 370
 371 #undef __array
 372 #define __array(type, item, len)
 373
 374 #undef __dynamic_array
 375 #define __dynamic_array(type, item, len)                                \
 376         __data_offsets->item = __data_size +                            \
 377                                offsetof(typeof(*entry), __data);        \
 378         __data_offsets->item |= (len * sizeof(type)) << 16;             \
 379         __data_size += (len) * sizeof(type);
 380
 381 #undef __string
 382 #define __string(item, src) __dynamic_array(char, item,                 \
 383                     strlen((src) ? (const char *)(src) : "(null)") + 1)
 384
 385 #undef DECLARE_EVENT_CLASS
 386 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 387 static inline notrace int ftrace_get_offsets_##call(                    \
 388         struct ftrace_data_offsets_##call *__data_offsets, proto)       \
 389 {                                                                       \
 390         int __data_size = 0;                                            \
 391         struct ftrace_raw_##call __maybe_unused *entry;                 \
 392                                                                         \
 393         tstruct;                                                        \
 394                                                                         \
 395         return __data_size;                                             \
 396 }
 397
 398 #undef DEFINE_EVENT
 399 #define DEFINE_EVENT(template, name, proto, args)
 400
 401 #undef DEFINE_EVENT_PRINT
 402 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
 403         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 404
 405 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 406
 407 /*
 408  * Stage 4 of the trace events.
 409  *
 410  * Override the macros in <trace/trace_events.h> to include the following:
 411  *
 412  * For those macros defined with TRACE_EVENT:
 413  *
 414  * static struct ftrace_event_call event_<call>;
 415  *
 416  * static void ftrace_raw_event_<call>(void *__data, proto)
 417  * {
 418  *      struct ftrace_event_file *ftrace_file = __data;
 419  *      struct ftrace_event_call *event_call = ftrace_file->event_call;
 420  *      struct ftrace_data_offsets_<call> __maybe_unused __data_offsets;
 421  *      unsigned long eflags = ftrace_file->flags;
 422  *      enum event_trigger_type __tt = ETT_NONE;
 423  *      struct ring_buffer_event *event;
 424  *      struct ftrace_raw_<call> *entry; <-- defined in stage 1
 425  *      struct ring_buffer *buffer;
 426  *      unsigned long irq_flags;
 427  *      int __data_size;
 428  *      int pc;
 429  *
 430  *      if (!(eflags & FTRACE_EVENT_FL_TRIGGER_COND)) {
 431  *              if (eflags & FTRACE_EVENT_FL_TRIGGER_MODE)
 432  *                      event_triggers_call(ftrace_file, NULL);
 433  *              if (eflags & FTRACE_EVENT_FL_SOFT_DISABLED)
 434  *                      return;
 435  *      }
 436  *
 437  *      local_save_flags(irq_flags);
 438  *      pc = preempt_count();
 439  *
 440  *      __data_size = ftrace_get_offsets_<call>(&__data_offsets, args);
 441  *
 442  *      event = trace_event_buffer_lock_reserve(&buffer, ftrace_file,
 443  *                                event_<call>->event.type,
 444  *                                sizeof(*entry) + __data_size,
 445  *                                irq_flags, pc);
 446  *      if (!event)
 447  *              return;
 448  *      entry   = ring_buffer_event_data(event);
 449  *
 450  *      { <assign>; }  <-- Here we assign the entries by the __field and
 451  *                         __array macros.
 452  *
 453  *      if (eflags & FTRACE_EVENT_FL_TRIGGER_COND)
 454  *              __tt = event_triggers_call(ftrace_file, entry);
 455  *
 456  *      if (test_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT,
 457  *                   &ftrace_file->flags))
 458  *              ring_buffer_discard_commit(buffer, event);
 459  *      else if (!filter_check_discard(ftrace_file, entry, buffer, event))
 460  *              trace_buffer_unlock_commit(buffer, event, irq_flags, pc);
 461  *
 462  *      if (__tt)
 463  *              event_triggers_post_call(ftrace_file, __tt);
 464  * }
 465  *
 466  * static struct trace_event ftrace_event_type_<call> = {
 467  *      .trace                  = ftrace_raw_output_<call>, <-- stage 2
 468  * };
 469  *
 470  * static const char print_fmt_<call>[] = <TP_printk>;
 471  *
 472  * static struct ftrace_event_class __used event_class_<template> = {
 473  *      .system                 = "<system>",
 474  *      .define_fields          = ftrace_define_fields_<call>,
 475  *      .fields                 = LIST_HEAD_INIT(event_class_##call.fields),
 476  *      .raw_init               = trace_event_raw_init,
 477  *      .probe                  = ftrace_raw_event_##call,
 478  *      .reg                    = ftrace_event_reg,
 479  * };
 480  *
 481  * static struct ftrace_event_call event_<call> = {
 482  *      .name                   = "<call>",
 483  *      .class                  = event_class_<template>,
 484  *      .event                  = &ftrace_event_type_<call>,
 485  *      .print_fmt              = print_fmt_<call>,
 486  * };
 487  * // its only safe to use pointers when doing linker tricks to
 488  * // create an array.
 489  * static struct ftrace_event_call __used
 490  * __attribute__((section("_ftrace_events"))) *__event_<call> = &event_<call>;
 491  *
 492  */
 493
 494 #ifdef CONFIG_PERF_EVENTS
 495
 496 #define _TRACE_PERF_PROTO(call, proto)                                  \
 497         static notrace void                                             \
 498         perf_trace_##call(void *__data, proto);
 499
 500 #define _TRACE_PERF_INIT(call)                                          \
 501         .perf_probe             = perf_trace_##call,
 502
 503 #else
 504 #define _TRACE_PERF_PROTO(call, proto)
 505 #define _TRACE_PERF_INIT(call)
 506 #endif /* CONFIG_PERF_EVENTS */
 507
 508 #undef __entry
 509 #define __entry entry
 510
 511 #undef __field
 512 #define __field(type, item)
 513
 514 #undef __array
 515 #define __array(type, item, len)
 516
 517 #undef __dynamic_array
 518 #define __dynamic_array(type, item, len)                                \
 519         __entry->__data_loc_##item = __data_offsets.item;
 520
 521 #undef __string
 522 #define __string(item, src) __dynamic_array(char, item, -1)             \
 523
 524 #undef __assign_str
 525 #define __assign_str(dst, src)                                          \
 526         strcpy(__get_str(dst), (src) ? (const char *)(src) : "(null)");
 527
 528 #undef TP_fast_assign
 529 #define TP_fast_assign(args...) args
 530
 531 #undef __perf_addr
 532 #define __perf_addr(a)  (a)
 533
 534 #undef __perf_count
 535 #define __perf_count(c) (c)
 536
 537 #undef __perf_task
 538 #define __perf_task(t)  (t)
 539
 540 #undef DECLARE_EVENT_CLASS
 541 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 542                                                                         \
 543 static notrace void                                                     \
 544 ftrace_raw_event_##call(void *__data, proto)                            \
 545 {                                                                       \
 546         struct ftrace_event_file *ftrace_file = __data;                 \
 547         struct ftrace_event_call *event_call = ftrace_file->event_call; \
 548         struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
 549         struct ring_buffer_event *event;                                \
 550         struct ftrace_raw_##call *entry;                                \
 551         struct ring_buffer *buffer;                                     \
 552         unsigned long irq_flags;                                        \
 553         int __data_size;                                                \
 554         int pc;                                                         \
 555                                                                         \
 556         if (ftrace_trigger_soft_disabled(ftrace_file))                  \
 557                 return;                                                 \
 558                                                                         \
 559         local_save_flags(irq_flags);                                    \
 560         pc = preempt_count();                                           \
 561                                                                         \
 562         __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
 563                                                                         \
 564         event = trace_event_buffer_lock_reserve(&buffer, ftrace_file,   \
 565                                  event_call->event.type,                \
 566                                  sizeof(*entry) + __data_size,          \
 567                                  irq_flags, pc);                        \
 568         if (!event)                                                     \
 569                 return;                                                 \
 570         entry   = ring_buffer_event_data(event);                        \
 571                                                                         \
 572         tstruct                                                         \
 573                                                                         \
 574         { assign; }                                                     \
 575                                                                         \
 576         event_trigger_unlock_commit(ftrace_file, buffer, event, entry, \
 577                                     irq_flags, pc);                    \
 578 }
 579 /*
 580  * The ftrace_test_probe is compiled out, it is only here as a build time check
 581  * to make sure that if the tracepoint handling changes, the ftrace probe will
 582  * fail to compile unless it too is updated.
 583  */
 584
 585 #undef DEFINE_EVENT
 586 #define DEFINE_EVENT(template, call, proto, args)                       \
 587 static inline void ftrace_test_probe_##call(void)                       \
 588 {                                                                       \
 589         check_trace_callback_type_##call(ftrace_raw_event_##template);  \
 590 }
 591
 592 #undef DEFINE_EVENT_PRINT
 593 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)
 594
 595 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 596
 597 #undef __entry
 598 #define __entry REC
 599
 600 #undef __print_flags
 601 #undef __print_symbolic
 602 #undef __print_hex
 603 #undef __get_dynamic_array
 604 #undef __get_str
 605
 606 #undef TP_printk
 607 #define TP_printk(fmt, args...) "\"" fmt "\", "  __stringify(args)
 608
 609 #undef DECLARE_EVENT_CLASS
 610 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 611 _TRACE_PERF_PROTO(call, PARAMS(proto));                                 \
 612 static const char print_fmt_##call[] = print;                           \
 613 static struct ftrace_event_class __used __refdata event_class_##call = { \
 614         .system                 = __stringify(TRACE_SYSTEM),            \
 615         .define_fields          = ftrace_define_fields_##call,          \
 616         .fields                 = LIST_HEAD_INIT(event_class_##call.fields),\
 617         .raw_init               = trace_event_raw_init,                 \
 618         .probe                  = ftrace_raw_event_##call,              \
 619         .reg                    = ftrace_event_reg,                     \
 620         _TRACE_PERF_INIT(call)                                          \
 621 };
 622
 623 #undef DEFINE_EVENT
 624 #define DEFINE_EVENT(template, call, proto, args)                       \
 625                                                                         \
 626 static struct ftrace_event_call __used event_##call = {                 \
 627         .name                   = #call,                                \
 628         .class                  = &event_class_##template,              \
 629         .event.funcs            = &ftrace_event_type_funcs_##template,  \
 630         .print_fmt              = print_fmt_##template,                 \
 631 };                                                                      \
 632 static struct ftrace_event_call __used                                  \
 633 __attribute__((section("_ftrace_events"))) *__event_##call = &event_##call
 634
 635 #undef DEFINE_EVENT_PRINT
 636 #define DEFINE_EVENT_PRINT(template, call, proto, args, print)          \
 637                                                                         \
 638 static const char print_fmt_##call[] = print;                           \
 639                                                                         \
 640 static struct ftrace_event_call __used event_##call = {                 \
 641         .name                   = #call,                                \
 642         .class                  = &event_class_##template,              \
 643         .event.funcs            = &ftrace_event_type_funcs_##call,      \
 644         .print_fmt              = print_fmt_##call,                     \
 645 };                                                                      \
 646 static struct ftrace_event_call __used                                  \
 647 __attribute__((section("_ftrace_events"))) *__event_##call = &event_##call
 648
 649 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 650
 651
 652 #ifdef CONFIG_PERF_EVENTS
 653
 654 #undef __entry
 655 #define __entry entry
 656
 657 #undef __get_dynamic_array
 658 #define __get_dynamic_array(field)      \
 659                 ((void *)__entry + (__entry->__data_loc_##field & 0xffff))
 660
 661 #undef __get_str
 662 #define __get_str(field) (char *)__get_dynamic_array(field)
 663
 664 #undef __perf_addr
 665 #define __perf_addr(a)  (__addr = (a))
 666
 667 #undef __perf_count
 668 #define __perf_count(c) (__count = (c))
 669
 670 #undef __perf_task
 671 #define __perf_task(t)  (__task = (t))
 672
 673 #undef DECLARE_EVENT_CLASS
 674 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 675 static notrace void                                                     \
 676 perf_trace_##call(void *__data, proto)                                  \
 677 {                                                                       \
 678         struct ftrace_event_call *event_call = __data;                  \
 679         struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
 680         struct ftrace_raw_##call *entry;                                \
 681         struct pt_regs __regs;                                          \
 682         u64 __addr = 0, __count = 1;                                    \
 683         struct task_struct *__task = NULL;                              \
 684         struct hlist_head *head;                                        \
 685         int __entry_size;                                               \
 686         int __data_size;                                                \
 687         int rctx;                                                       \
 688                                                                         \
 689         __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
 690                                                                         \
 691         head = this_cpu_ptr(event_call->perf_events);                   \
 692         if (__builtin_constant_p(!__task) && !__task &&                 \
 693                                 hlist_empty(head))                      \
 694                 return;                                                 \
 695                                                                         \
 696         __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),\
 697                              sizeof(u64));                              \
 698         __entry_size -= sizeof(u32);                                    \
 699                                                                         \
 700         perf_fetch_caller_regs(&__regs);                                \
 701         entry = perf_trace_buf_prepare(__entry_size,                    \
 702                         event_call->event.type, &__regs, &rctx);        \
 703         if (!entry)                                                     \
 704                 return;                                                 \
 705                                                                         \
 706         tstruct                                                         \
 707                                                                         \
 708         { assign; }                                                     \
 709                                                                         \
 710         perf_trace_buf_submit(entry, __entry_size, rctx, __addr,        \
 711                 __count, &__regs, head, __task);                        \
 712 }
 713
 714 /*
 715  * This part is compiled out, it is only here as a build time check
 716  * to make sure that if the tracepoint handling changes, the
 717  * perf probe will fail to compile unless it too is updated.
 718  */
 719 #undef DEFINE_EVENT
 720 #define DEFINE_EVENT(template, call, proto, args)                       \
 721 static inline void perf_test_probe_##call(void)                         \
 722 {                                                                       \
 723         check_trace_callback_type_##call(perf_trace_##template);        \
 724 }
 725
 726
 727 #undef DEFINE_EVENT_PRINT
 728 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
 729         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 730
 731 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 732 #endif /* CONFIG_PERF_EVENTS */
 733