include/trace/trace_events.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Stage 1 of the trace events.
   4  *
   5  * Override the macros in the event tracepoint header <trace/events/XXX.h>
   6  * to include the following:
   7  *
   8  * struct trace_event_raw_<call> {
   9  *      struct trace_entry              ent;
  10  *      <type>                          <item>;
  11  *      <type2>                         <item2>[<len>];
  12  *      [...]
  13  * };
  14  *
  15  * The <type> <item> is created by the __field(type, item) macro or
  16  * the __array(type2, item2, len) macro.
  17  * We simply do "type item;", and that will create the fields
  18  * in the structure.
  19  */
  20
  21 #include <linux/trace_events.h>
  22
  23 #ifndef TRACE_SYSTEM_VAR
  24 #define TRACE_SYSTEM_VAR TRACE_SYSTEM
  25 #endif
  26
  27 #define __app__(x, y) str__##x##y
  28 #define __app(x, y) __app__(x, y)
  29
  30 #define TRACE_SYSTEM_STRING __app(TRACE_SYSTEM_VAR,__trace_system_name)
  31
  32 #define TRACE_MAKE_SYSTEM_STR()                         \
  33         static const char TRACE_SYSTEM_STRING[] =       \
  34                 __stringify(TRACE_SYSTEM)
  35
  36 TRACE_MAKE_SYSTEM_STR();
  37
  38 #undef TRACE_DEFINE_ENUM
  39 #define TRACE_DEFINE_ENUM(a)                            \
  40         static struct trace_eval_map __used __initdata  \
  41         __##TRACE_SYSTEM##_##a =                        \
  42         {                                               \
  43                 .system = TRACE_SYSTEM_STRING,          \
  44                 .eval_string = #a,                      \
  45                 .eval_value = a                         \
  46         };                                              \
  47         static struct trace_eval_map __used             \
  48         __section("_ftrace_eval_map")                   \
  49         *TRACE_SYSTEM##_##a = &__##TRACE_SYSTEM##_##a
  50
  51 #undef TRACE_DEFINE_SIZEOF
  52 #define TRACE_DEFINE_SIZEOF(a)                          \
  53         static struct trace_eval_map __used __initdata  \
  54         __##TRACE_SYSTEM##_##a =                        \
  55         {                                               \
  56                 .system = TRACE_SYSTEM_STRING,          \
  57                 .eval_string = "sizeof(" #a ")",        \
  58                 .eval_value = sizeof(a)                 \
  59         };                                              \
  60         static struct trace_eval_map __used             \
  61         __section("_ftrace_eval_map")                   \
  62         *TRACE_SYSTEM##_##a = &__##TRACE_SYSTEM##_##a
  63
  64 /*
  65  * DECLARE_EVENT_CLASS can be used to add a generic function
  66  * handlers for events. That is, if all events have the same
  67  * parameters and just have distinct trace points.
  68  * Each tracepoint can be defined with DEFINE_EVENT and that
  69  * will map the DECLARE_EVENT_CLASS to the tracepoint.
  70  *
  71  * TRACE_EVENT is a one to one mapping between tracepoint and template.
  72  */
  73 #undef TRACE_EVENT
  74 #define TRACE_EVENT(name, proto, args, tstruct, assign, print) \
  75         DECLARE_EVENT_CLASS(name,                              \
  76                              PARAMS(proto),                    \
  77                              PARAMS(args),                     \
  78                              PARAMS(tstruct),                  \
  79                              PARAMS(assign),                   \
  80                              PARAMS(print));                   \
  81         DEFINE_EVENT(name, name, PARAMS(proto), PARAMS(args));
  82
  83
  84 #undef __field
  85 #define __field(type, item)             type    item;
  86
  87 #undef __field_ext
  88 #define __field_ext(type, item, filter_type)    type    item;
  89
  90 #undef __field_struct
  91 #define __field_struct(type, item)      type    item;
  92
  93 #undef __field_struct_ext
  94 #define __field_struct_ext(type, item, filter_type)     type    item;
  95
  96 #undef __array
  97 #define __array(type, item, len)        type    item[len];
  98
  99 #undef __dynamic_array
 100 #define __dynamic_array(type, item, len) u32 __data_loc_##item;
 101
 102 #undef __string
 103 #define __string(item, src) __dynamic_array(char, item, -1)
 104
 105 #undef __string_len
 106 #define __string_len(item, src, len) __dynamic_array(char, item, -1)
 107
 108 #undef __bitmask
 109 #define __bitmask(item, nr_bits) __dynamic_array(char, item, -1)
 110
 111 #undef __rel_dynamic_array
 112 #define __rel_dynamic_array(type, item, len) u32 __rel_loc_##item;
 113
 114 #undef __rel_string
 115 #define __rel_string(item, src) __rel_dynamic_array(char, item, -1)
 116
 117 #undef __rel_string_len
 118 #define __rel_string_len(item, src, len) __rel_dynamic_array(char, item, -1)
 119
 120 #undef __rel_bitmask
 121 #define __rel_bitmask(item, nr_bits) __rel_dynamic_array(char, item, -1)
 122
 123 #undef TP_STRUCT__entry
 124 #define TP_STRUCT__entry(args...) args
 125
 126 #undef DECLARE_EVENT_CLASS
 127 #define DECLARE_EVENT_CLASS(name, proto, args, tstruct, assign, print)  \
 128         struct trace_event_raw_##name {                                 \
 129                 struct trace_entry      ent;                            \
 130                 tstruct                                                 \
 131                 char                    __data[];                       \
 132         };                                                              \
 133                                                                         \
 134         static struct trace_event_class event_class_##name;
 135
 136 #undef DEFINE_EVENT
 137 #define DEFINE_EVENT(template, name, proto, args)       \
 138         static struct trace_event_call  __used          \
 139         __attribute__((__aligned__(4))) event_##name
 140
 141 #undef DEFINE_EVENT_FN
 142 #define DEFINE_EVENT_FN(template, name, proto, args, reg, unreg)        \
 143         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 144
 145 #undef DEFINE_EVENT_PRINT
 146 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
 147         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 148
 149 /* Callbacks are meaningless to ftrace. */
 150 #undef TRACE_EVENT_FN
 151 #define TRACE_EVENT_FN(name, proto, args, tstruct,                      \
 152                 assign, print, reg, unreg)                              \
 153         TRACE_EVENT(name, PARAMS(proto), PARAMS(args),                  \
 154                 PARAMS(tstruct), PARAMS(assign), PARAMS(print))         \
 155
 156 #undef TRACE_EVENT_FN_COND
 157 #define TRACE_EVENT_FN_COND(name, proto, args, cond, tstruct,   \
 158                 assign, print, reg, unreg)                              \
 159         TRACE_EVENT_CONDITION(name, PARAMS(proto), PARAMS(args), PARAMS(cond),          \
 160                 PARAMS(tstruct), PARAMS(assign), PARAMS(print))         \
 161
 162 #undef TRACE_EVENT_FLAGS
 163 #define TRACE_EVENT_FLAGS(name, value)                                  \
 164         __TRACE_EVENT_FLAGS(name, value)
 165
 166 #undef TRACE_EVENT_PERF_PERM
 167 #define TRACE_EVENT_PERF_PERM(name, expr...)                            \
 168         __TRACE_EVENT_PERF_PERM(name, expr)
 169
 170 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 171
 172 /*
 173  * Stage 2 of the trace events.
 174  *
 175  * Include the following:
 176  *
 177  * struct trace_event_data_offsets_<call> {
 178  *      u32                             <item1>;
 179  *      u32                             <item2>;
 180  *      [...]
 181  * };
 182  *
 183  * The __dynamic_array() macro will create each u32 <item>, this is
 184  * to keep the offset of each array from the beginning of the event.
 185  * The size of an array is also encoded, in the higher 16 bits of <item>.
 186  */
 187
 188 #undef TRACE_DEFINE_ENUM
 189 #define TRACE_DEFINE_ENUM(a)
 190
 191 #undef TRACE_DEFINE_SIZEOF
 192 #define TRACE_DEFINE_SIZEOF(a)
 193
 194 #undef __field
 195 #define __field(type, item)
 196
 197 #undef __field_ext
 198 #define __field_ext(type, item, filter_type)
 199
 200 #undef __field_struct
 201 #define __field_struct(type, item)
 202
 203 #undef __field_struct_ext
 204 #define __field_struct_ext(type, item, filter_type)
 205
 206 #undef __array
 207 #define __array(type, item, len)
 208
 209 #undef __dynamic_array
 210 #define __dynamic_array(type, item, len)        u32 item;
 211
 212 #undef __string
 213 #define __string(item, src) __dynamic_array(char, item, -1)
 214
 215 #undef __bitmask
 216 #define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item, -1)
 217
 218 #undef __string_len
 219 #define __string_len(item, src, len) __dynamic_array(char, item, -1)
 220
 221 #undef __rel_dynamic_array
 222 #define __rel_dynamic_array(type, item, len)    u32 item;
 223
 224 #undef __rel_string
 225 #define __rel_string(item, src) __rel_dynamic_array(char, item, -1)
 226
 227 #undef __rel_string_len
 228 #define __rel_string_len(item, src, len) __rel_dynamic_array(char, item, -1)
 229
 230 #undef __rel_bitmask
 231 #define __rel_bitmask(item, nr_bits) __rel_dynamic_array(unsigned long, item, -1)
 232
 233 #undef DECLARE_EVENT_CLASS
 234 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 235         struct trace_event_data_offsets_##call {                        \
 236                 tstruct;                                                \
 237         };
 238
 239 #undef DEFINE_EVENT
 240 #define DEFINE_EVENT(template, name, proto, args)
 241
 242 #undef DEFINE_EVENT_PRINT
 243 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)
 244
 245 #undef TRACE_EVENT_FLAGS
 246 #define TRACE_EVENT_FLAGS(event, flag)
 247
 248 #undef TRACE_EVENT_PERF_PERM
 249 #define TRACE_EVENT_PERF_PERM(event, expr...)
 250
 251 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 252
 253 /*
 254  * Stage 3 of the trace events.
 255  *
 256  * Override the macros in the event tracepoint header <trace/events/XXX.h>
 257  * to include the following:
 258  *
 259  * enum print_line_t
 260  * trace_raw_output_<call>(struct trace_iterator *iter, int flags)
 261  * {
 262  *      struct trace_seq *s = &iter->seq;
 263  *      struct trace_event_raw_<call> *field; <-- defined in stage 1
 264  *      struct trace_seq *p = &iter->tmp_seq;
 265  *
 266  * -------(for event)-------
 267  *
 268  *      struct trace_entry *entry;
 269  *
 270  *      entry = iter->ent;
 271  *
 272  *      if (entry->type != event_<call>->event.type) {
 273  *              WARN_ON_ONCE(1);
 274  *              return TRACE_TYPE_UNHANDLED;
 275  *      }
 276  *
 277  *      field = (typeof(field))entry;
 278  *
 279  *      trace_seq_init(p);
 280  *      return trace_output_call(iter, <call>, <TP_printk> "\n");
 281  *
 282  * ------(or, for event class)------
 283  *
 284  *      int ret;
 285  *
 286  *      field = (typeof(field))iter->ent;
 287  *
 288  *      ret = trace_raw_output_prep(iter, trace_event);
 289  *      if (ret != TRACE_TYPE_HANDLED)
 290  *              return ret;
 291  *
 292  *      trace_event_printf(iter, <TP_printk> "\n");
 293  *
 294  *      return trace_handle_return(s);
 295  * -------
 296  *  }
 297  *
 298  * This is the method used to print the raw event to the trace
 299  * output format. Note, this is not needed if the data is read
 300  * in binary.
 301  */
 302
 303 #undef __entry
 304 #define __entry field
 305
 306 #undef TP_printk
 307 #define TP_printk(fmt, args...) fmt "\n", args
 308
 309 #undef __get_dynamic_array
 310 #define __get_dynamic_array(field)      \
 311                 ((void *)__entry + (__entry->__data_loc_##field & 0xffff))
 312
 313 #undef __get_dynamic_array_len
 314 #define __get_dynamic_array_len(field)  \
 315                 ((__entry->__data_loc_##field >> 16) & 0xffff)
 316
 317 #undef __get_str
 318 #define __get_str(field) ((char *)__get_dynamic_array(field))
 319
 320 #undef __get_rel_dynamic_array
 321 #define __get_rel_dynamic_array(field)                                  \
 322                 ((void *)__entry +                                      \
 323                  offsetof(typeof(*__entry), __rel_loc_##field) +        \
 324                  sizeof(__entry->__rel_loc_##field) +                   \
 325                  (__entry->__rel_loc_##field & 0xffff))
 326
 327 #undef __get_rel_dynamic_array_len
 328 #define __get_rel_dynamic_array_len(field)      \
 329                 ((__entry->__rel_loc_##field >> 16) & 0xffff)
 330
 331 #undef __get_rel_str
 332 #define __get_rel_str(field) ((char *)__get_rel_dynamic_array(field))
 333
 334 #undef __get_bitmask
 335 #define __get_bitmask(field)                                            \
 336         ({                                                              \
 337                 void *__bitmask = __get_dynamic_array(field);           \
 338                 unsigned int __bitmask_size;                            \
 339                 __bitmask_size = __get_dynamic_array_len(field);        \
 340                 trace_print_bitmask_seq(p, __bitmask, __bitmask_size);  \
 341         })
 342
 343 #undef __get_rel_bitmask
 344 #define __get_rel_bitmask(field)                                                \
 345         ({                                                              \
 346                 void *__bitmask = __get_rel_dynamic_array(field);               \
 347                 unsigned int __bitmask_size;                            \
 348                 __bitmask_size = __get_rel_dynamic_array_len(field);    \
 349                 trace_print_bitmask_seq(p, __bitmask, __bitmask_size);  \
 350         })
 351
 352 #undef __print_flags
 353 #define __print_flags(flag, delim, flag_array...)                       \
 354         ({                                                              \
 355                 static const struct trace_print_flags __flags[] =       \
 356                         { flag_array, { -1, NULL }};                    \
 357                 trace_print_flags_seq(p, delim, flag, __flags); \
 358         })
 359
 360 #undef __print_symbolic
 361 #define __print_symbolic(value, symbol_array...)                        \
 362         ({                                                              \
 363                 static const struct trace_print_flags symbols[] =       \
 364                         { symbol_array, { -1, NULL }};                  \
 365                 trace_print_symbols_seq(p, value, symbols);             \
 366         })
 367
 368 #undef __print_flags_u64
 369 #undef __print_symbolic_u64
 370 #if BITS_PER_LONG == 32
 371 #define __print_flags_u64(flag, delim, flag_array...)                   \
 372         ({                                                              \
 373                 static const struct trace_print_flags_u64 __flags[] =   \
 374                         { flag_array, { -1, NULL } };                   \
 375                 trace_print_flags_seq_u64(p, delim, flag, __flags);     \
 376         })
 377
 378 #define __print_symbolic_u64(value, symbol_array...)                    \
 379         ({                                                              \
 380                 static const struct trace_print_flags_u64 symbols[] =   \
 381                         { symbol_array, { -1, NULL } };                 \
 382                 trace_print_symbols_seq_u64(p, value, symbols); \
 383         })
 384 #else
 385 #define __print_flags_u64(flag, delim, flag_array...)                   \
 386                         __print_flags(flag, delim, flag_array)
 387
 388 #define __print_symbolic_u64(value, symbol_array...)                    \
 389                         __print_symbolic(value, symbol_array)
 390 #endif
 391
 392 #undef __print_hex
 393 #define __print_hex(buf, buf_len)                                       \
 394         trace_print_hex_seq(p, buf, buf_len, false)
 395
 396 #undef __print_hex_str
 397 #define __print_hex_str(buf, buf_len)                                   \
 398         trace_print_hex_seq(p, buf, buf_len, true)
 399
 400 #undef __print_array
 401 #define __print_array(array, count, el_size)                            \
 402         ({                                                              \
 403                 BUILD_BUG_ON(el_size != 1 && el_size != 2 &&            \
 404                              el_size != 4 && el_size != 8);             \
 405                 trace_print_array_seq(p, array, count, el_size);        \
 406         })
 407
 408 #undef __print_hex_dump
 409 #define __print_hex_dump(prefix_str, prefix_type,                       \
 410                          rowsize, groupsize, buf, len, ascii)           \
 411         trace_print_hex_dump_seq(p, prefix_str, prefix_type,            \
 412                                  rowsize, groupsize, buf, len, ascii)
 413
 414 #undef __print_ns_to_secs
 415 #define __print_ns_to_secs(value)                       \
 416         ({                                              \
 417                 u64 ____val = (u64)(value);             \
 418                 do_div(____val, NSEC_PER_SEC);          \
 419                 ____val;                                \
 420         })
 421
 422 #undef __print_ns_without_secs
 423 #define __print_ns_without_secs(value)                  \
 424         ({                                              \
 425                 u64 ____val = (u64)(value);             \
 426                 (u32) do_div(____val, NSEC_PER_SEC);    \
 427         })
 428
 429 #undef DECLARE_EVENT_CLASS
 430 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 431 static notrace enum print_line_t                                        \
 432 trace_raw_output_##call(struct trace_iterator *iter, int flags,         \
 433                         struct trace_event *trace_event)                \
 434 {                                                                       \
 435         struct trace_seq *s = &iter->seq;                               \
 436         struct trace_seq __maybe_unused *p = &iter->tmp_seq;            \
 437         struct trace_event_raw_##call *field;                           \
 438         int ret;                                                        \
 439                                                                         \
 440         field = (typeof(field))iter->ent;                               \
 441                                                                         \
 442         ret = trace_raw_output_prep(iter, trace_event);                 \
 443         if (ret != TRACE_TYPE_HANDLED)                                  \
 444                 return ret;                                             \
 445                                                                         \
 446         trace_event_printf(iter, print);                                \
 447                                                                         \
 448         return trace_handle_return(s);                                  \
 449 }                                                                       \
 450 static struct trace_event_functions trace_event_type_funcs_##call = {   \
 451         .trace                  = trace_raw_output_##call,              \
 452 };
 453
 454 #undef DEFINE_EVENT_PRINT
 455 #define DEFINE_EVENT_PRINT(template, call, proto, args, print)          \
 456 static notrace enum print_line_t                                        \
 457 trace_raw_output_##call(struct trace_iterator *iter, int flags,         \
 458                          struct trace_event *event)                     \
 459 {                                                                       \
 460         struct trace_event_raw_##template *field;                       \
 461         struct trace_entry *entry;                                      \
 462         struct trace_seq *p = &iter->tmp_seq;                           \
 463                                                                         \
 464         entry = iter->ent;                                              \
 465                                                                         \
 466         if (entry->type != event_##call.event.type) {                   \
 467                 WARN_ON_ONCE(1);                                        \
 468                 return TRACE_TYPE_UNHANDLED;                            \
 469         }                                                               \
 470                                                                         \
 471         field = (typeof(field))entry;                                   \
 472                                                                         \
 473         trace_seq_init(p);                                              \
 474         return trace_output_call(iter, #call, print);                   \
 475 }                                                                       \
 476 static struct trace_event_functions trace_event_type_funcs_##call = {   \
 477         .trace                  = trace_raw_output_##call,              \
 478 };
 479
 480 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 481
 482 #undef __field_ext
 483 #define __field_ext(_type, _item, _filter_type) {                       \
 484         .type = #_type, .name = #_item,                                 \
 485         .size = sizeof(_type), .align = __alignof__(_type),             \
 486         .is_signed = is_signed_type(_type), .filter_type = _filter_type },
 487
 488 #undef __field_struct_ext
 489 #define __field_struct_ext(_type, _item, _filter_type) {                \
 490         .type = #_type, .name = #_item,                                 \
 491         .size = sizeof(_type), .align = __alignof__(_type),             \
 492         0, .filter_type = _filter_type },
 493
 494 #undef __field
 495 #define __field(type, item)     __field_ext(type, item, FILTER_OTHER)
 496
 497 #undef __field_struct
 498 #define __field_struct(type, item) __field_struct_ext(type, item, FILTER_OTHER)
 499
 500 #undef __array
 501 #define __array(_type, _item, _len) {                                   \
 502         .type = #_type"["__stringify(_len)"]", .name = #_item,          \
 503         .size = sizeof(_type[_len]), .align = __alignof__(_type),       \
 504         .is_signed = is_signed_type(_type), .filter_type = FILTER_OTHER },
 505
 506 #undef __dynamic_array
 507 #define __dynamic_array(_type, _item, _len) {                           \
 508         .type = "__data_loc " #_type "[]", .name = #_item,              \
 509         .size = 4, .align = 4,                                          \
 510         .is_signed = is_signed_type(_type), .filter_type = FILTER_OTHER },
 511
 512 #undef __string
 513 #define __string(item, src) __dynamic_array(char, item, -1)
 514
 515 #undef __string_len
 516 #define __string_len(item, src, len) __dynamic_array(char, item, -1)
 517
 518 #undef __bitmask
 519 #define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item, -1)
 520
 521 #undef __rel_dynamic_array
 522 #define __rel_dynamic_array(_type, _item, _len) {                       \
 523         .type = "__rel_loc " #_type "[]", .name = #_item,               \
 524         .size = 4, .align = 4,                                          \
 525         .is_signed = is_signed_type(_type), .filter_type = FILTER_OTHER },
 526
 527 #undef __rel_string
 528 #define __rel_string(item, src) __rel_dynamic_array(char, item, -1)
 529
 530 #undef __rel_string_len
 531 #define __rel_string_len(item, src, len) __rel_dynamic_array(char, item, -1)
 532
 533 #undef __rel_bitmask
 534 #define __rel_bitmask(item, nr_bits) __rel_dynamic_array(unsigned long, item, -1)
 535
 536 #undef DECLARE_EVENT_CLASS
 537 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, func, print)    \
 538 static struct trace_event_fields trace_event_fields_##call[] = {        \
 539         tstruct                                                         \
 540         {} };
 541
 542 #undef DEFINE_EVENT_PRINT
 543 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)
 544
 545 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 546
 547 /*
 548  * remember the offset of each array from the beginning of the event.
 549  */
 550
 551 #undef __entry
 552 #define __entry entry
 553
 554 #undef __field
 555 #define __field(type, item)
 556
 557 #undef __field_ext
 558 #define __field_ext(type, item, filter_type)
 559
 560 #undef __field_struct
 561 #define __field_struct(type, item)
 562
 563 #undef __field_struct_ext
 564 #define __field_struct_ext(type, item, filter_type)
 565
 566 #undef __array
 567 #define __array(type, item, len)
 568
 569 #undef __dynamic_array
 570 #define __dynamic_array(type, item, len)                                \
 571         __item_length = (len) * sizeof(type);                           \
 572         __data_offsets->item = __data_size +                            \
 573                                offsetof(typeof(*entry), __data);        \
 574         __data_offsets->item |= __item_length << 16;                    \
 575         __data_size += __item_length;
 576
 577 #undef __string
 578 #define __string(item, src) __dynamic_array(char, item,                 \
 579                     strlen((src) ? (const char *)(src) : "(null)") + 1)
 580
 581 #undef __string_len
 582 #define __string_len(item, src, len) __dynamic_array(char, item, (len) + 1)
 583
 584 #undef __rel_dynamic_array
 585 #define __rel_dynamic_array(type, item, len)                            \
 586         __item_length = (len) * sizeof(type);                           \
 587         __data_offsets->item = __data_size +                            \
 588                                offsetof(typeof(*entry), __data) -       \
 589                                offsetof(typeof(*entry), __rel_loc_##item) -     \
 590                                sizeof(u32);                             \
 591         __data_offsets->item |= __item_length << 16;                    \
 592         __data_size += __item_length;
 593
 594 #undef __rel_string
 595 #define __rel_string(item, src) __rel_dynamic_array(char, item,                 \
 596                     strlen((src) ? (const char *)(src) : "(null)") + 1)
 597
 598 #undef __rel_string_len
 599 #define __rel_string_len(item, src, len) __rel_dynamic_array(char, item, (len) + 1)
 600 /*
 601  * __bitmask_size_in_bytes_raw is the number of bytes needed to hold
 602  * num_possible_cpus().
 603  */
 604 #define __bitmask_size_in_bytes_raw(nr_bits)    \
 605         (((nr_bits) + 7) / 8)
 606
 607 #define __bitmask_size_in_longs(nr_bits)                        \
 608         ((__bitmask_size_in_bytes_raw(nr_bits) +                \
 609           ((BITS_PER_LONG / 8) - 1)) / (BITS_PER_LONG / 8))
 610
 611 /*
 612  * __bitmask_size_in_bytes is the number of bytes needed to hold
 613  * num_possible_cpus() padded out to the nearest long. This is what
 614  * is saved in the buffer, just to be consistent.
 615  */
 616 #define __bitmask_size_in_bytes(nr_bits)                                \
 617         (__bitmask_size_in_longs(nr_bits) * (BITS_PER_LONG / 8))
 618
 619 #undef __bitmask
 620 #define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item,   \
 621                                          __bitmask_size_in_longs(nr_bits))
 622
 623 #undef __rel_bitmask
 624 #define __rel_bitmask(item, nr_bits) __rel_dynamic_array(unsigned long, item,   \
 625                                          __bitmask_size_in_longs(nr_bits))
 626
 627 #undef DECLARE_EVENT_CLASS
 628 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 629 static inline notrace int trace_event_get_offsets_##call(               \
 630         struct trace_event_data_offsets_##call *__data_offsets, proto)  \
 631 {                                                                       \
 632         int __data_size = 0;                                            \
 633         int __maybe_unused __item_length;                               \
 634         struct trace_event_raw_##call __maybe_unused *entry;            \
 635                                                                         \
 636         tstruct;                                                        \
 637                                                                         \
 638         return __data_size;                                             \
 639 }
 640
 641 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 642
 643 /*
 644  * Stage 4 of the trace events.
 645  *
 646  * Override the macros in the event tracepoint header <trace/events/XXX.h>
 647  * to include the following:
 648  *
 649  * For those macros defined with TRACE_EVENT:
 650  *
 651  * static struct trace_event_call event_<call>;
 652  *
 653  * static void trace_event_raw_event_<call>(void *__data, proto)
 654  * {
 655  *      struct trace_event_file *trace_file = __data;
 656  *      struct trace_event_call *event_call = trace_file->event_call;
 657  *      struct trace_event_data_offsets_<call> __maybe_unused __data_offsets;
 658  *      unsigned long eflags = trace_file->flags;
 659  *      enum event_trigger_type __tt = ETT_NONE;
 660  *      struct ring_buffer_event *event;
 661  *      struct trace_event_raw_<call> *entry; <-- defined in stage 1
 662  *      struct trace_buffer *buffer;
 663  *      unsigned long irq_flags;
 664  *      int __data_size;
 665  *      int pc;
 666  *
 667  *      if (!(eflags & EVENT_FILE_FL_TRIGGER_COND)) {
 668  *              if (eflags & EVENT_FILE_FL_TRIGGER_MODE)
 669  *                      event_triggers_call(trace_file, NULL);
 670  *              if (eflags & EVENT_FILE_FL_SOFT_DISABLED)
 671  *                      return;
 672  *      }
 673  *
 674  *      local_save_flags(irq_flags);
 675  *      pc = preempt_count();
 676  *
 677  *      __data_size = trace_event_get_offsets_<call>(&__data_offsets, args);
 678  *
 679  *      event = trace_event_buffer_lock_reserve(&buffer, trace_file,
 680  *                                event_<call>->event.type,
 681  *                                sizeof(*entry) + __data_size,
 682  *                                irq_flags, pc);
 683  *      if (!event)
 684  *              return;
 685  *      entry   = ring_buffer_event_data(event);
 686  *
 687  *      { <assign>; }  <-- Here we assign the entries by the __field and
 688  *                         __array macros.
 689  *
 690  *      if (eflags & EVENT_FILE_FL_TRIGGER_COND)
 691  *              __tt = event_triggers_call(trace_file, entry);
 692  *
 693  *      if (test_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT,
 694  *                   &trace_file->flags))
 695  *              ring_buffer_discard_commit(buffer, event);
 696  *      else if (!filter_check_discard(trace_file, entry, buffer, event))
 697  *              trace_buffer_unlock_commit(buffer, event, irq_flags, pc);
 698  *
 699  *      if (__tt)
 700  *              event_triggers_post_call(trace_file, __tt);
 701  * }
 702  *
 703  * static struct trace_event ftrace_event_type_<call> = {
 704  *      .trace                  = trace_raw_output_<call>, <-- stage 2
 705  * };
 706  *
 707  * static char print_fmt_<call>[] = <TP_printk>;
 708  *
 709  * static struct trace_event_class __used event_class_<template> = {
 710  *      .system                 = "<system>",
 711  *      .fields_array           = trace_event_fields_<call>,
 712  *      .fields                 = LIST_HEAD_INIT(event_class_##call.fields),
 713  *      .raw_init               = trace_event_raw_init,
 714  *      .probe                  = trace_event_raw_event_##call,
 715  *      .reg                    = trace_event_reg,
 716  * };
 717  *
 718  * static struct trace_event_call event_<call> = {
 719  *      .class                  = event_class_<template>,
 720  *      {
 721  *              .tp                     = &__tracepoint_<call>,
 722  *      },
 723  *      .event                  = &ftrace_event_type_<call>,
 724  *      .print_fmt              = print_fmt_<call>,
 725  *      .flags                  = TRACE_EVENT_FL_TRACEPOINT,
 726  * };
 727  * // its only safe to use pointers when doing linker tricks to
 728  * // create an array.
 729  * static struct trace_event_call __used
 730  * __section("_ftrace_events") *__event_<call> = &event_<call>;
 731  *
 732  */
 733
 734 #ifdef CONFIG_PERF_EVENTS
 735
 736 #define _TRACE_PERF_PROTO(call, proto)                                  \
 737         static notrace void                                             \
 738         perf_trace_##call(void *__data, proto);
 739
 740 #define _TRACE_PERF_INIT(call)                                          \
 741         .perf_probe             = perf_trace_##call,
 742
 743 #else
 744 #define _TRACE_PERF_PROTO(call, proto)
 745 #define _TRACE_PERF_INIT(call)
 746 #endif /* CONFIG_PERF_EVENTS */
 747
 748 #undef __entry
 749 #define __entry entry
 750
 751 #undef __field
 752 #define __field(type, item)
 753
 754 #undef __field_struct
 755 #define __field_struct(type, item)
 756
 757 #undef __array
 758 #define __array(type, item, len)
 759
 760 #undef __dynamic_array
 761 #define __dynamic_array(type, item, len)                                \
 762         __entry->__data_loc_##item = __data_offsets.item;
 763
 764 #undef __string
 765 #define __string(item, src) __dynamic_array(char, item, -1)
 766
 767 #undef __string_len
 768 #define __string_len(item, src, len) __dynamic_array(char, item, -1)
 769
 770 #undef __assign_str
 771 #define __assign_str(dst, src)                                          \
 772         strcpy(__get_str(dst), (src) ? (const char *)(src) : "(null)");
 773
 774 #undef __assign_str_len
 775 #define __assign_str_len(dst, src, len)                                 \
 776         do {                                                            \
 777                 memcpy(__get_str(dst), (src), (len));                   \
 778                 __get_str(dst)[len] = '\0';                             \
 779         } while(0)
 780
 781 #undef __bitmask
 782 #define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item, -1)
 783
 784 #undef __get_bitmask
 785 #define __get_bitmask(field) (char *)__get_dynamic_array(field)
 786
 787 #undef __assign_bitmask
 788 #define __assign_bitmask(dst, src, nr_bits)                                     \
 789         memcpy(__get_bitmask(dst), (src), __bitmask_size_in_bytes(nr_bits))
 790
 791 #undef __rel_dynamic_array
 792 #define __rel_dynamic_array(type, item, len)                            \
 793         __entry->__rel_loc_##item = __data_offsets.item;
 794
 795 #undef __rel_string
 796 #define __rel_string(item, src) __rel_dynamic_array(char, item, -1)
 797
 798 #undef __rel_string_len
 799 #define __rel_string_len(item, src, len) __rel_dynamic_array(char, item, -1)
 800
 801 #undef __assign_rel_str
 802 #define __assign_rel_str(dst, src)                                      \
 803         strcpy(__get_rel_str(dst), (src) ? (const char *)(src) : "(null)");
 804
 805 #undef __assign_rel_str_len
 806 #define __assign_rel_str_len(dst, src, len)                             \
 807         do {                                                            \
 808                 memcpy(__get_rel_str(dst), (src), (len));               \
 809                 __get_rel_str(dst)[len] = '\0';                         \
 810         } while (0)
 811
 812 #undef __rel_bitmask
 813 #define __rel_bitmask(item, nr_bits) __rel_dynamic_array(unsigned long, item, -1)
 814
 815 #undef __get_rel_bitmask
 816 #define __get_rel_bitmask(field) (char *)__get_rel_dynamic_array(field)
 817
 818 #undef __assign_rel_bitmask
 819 #define __assign_rel_bitmask(dst, src, nr_bits)                                 \
 820         memcpy(__get_rel_bitmask(dst), (src), __bitmask_size_in_bytes(nr_bits))
 821
 822 #undef TP_fast_assign
 823 #define TP_fast_assign(args...) args
 824
 825 #undef __perf_count
 826 #define __perf_count(c) (c)
 827
 828 #undef __perf_task
 829 #define __perf_task(t)  (t)
 830
 831 #undef DECLARE_EVENT_CLASS
 832 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 833                                                                         \
 834 static notrace void                                                     \
 835 trace_event_raw_event_##call(void *__data, proto)                       \
 836 {                                                                       \
 837         struct trace_event_file *trace_file = __data;                   \
 838         struct trace_event_data_offsets_##call __maybe_unused __data_offsets;\
 839         struct trace_event_buffer fbuffer;                              \
 840         struct trace_event_raw_##call *entry;                           \
 841         int __data_size;                                                \
 842                                                                         \
 843         if (trace_trigger_soft_disabled(trace_file))                    \
 844                 return;                                                 \
 845                                                                         \
 846         __data_size = trace_event_get_offsets_##call(&__data_offsets, args); \
 847                                                                         \
 848         entry = trace_event_buffer_reserve(&fbuffer, trace_file,        \
 849                                  sizeof(*entry) + __data_size);         \
 850                                                                         \
 851         if (!entry)                                                     \
 852                 return;                                                 \
 853                                                                         \
 854         tstruct                                                         \
 855                                                                         \
 856         { assign; }                                                     \
 857                                                                         \
 858         trace_event_buffer_commit(&fbuffer);                            \
 859 }
 860 /*
 861  * The ftrace_test_probe is compiled out, it is only here as a build time check
 862  * to make sure that if the tracepoint handling changes, the ftrace probe will
 863  * fail to compile unless it too is updated.
 864  */
 865
 866 #undef DEFINE_EVENT
 867 #define DEFINE_EVENT(template, call, proto, args)                       \
 868 static inline void ftrace_test_probe_##call(void)                       \
 869 {                                                                       \
 870         check_trace_callback_type_##call(trace_event_raw_event_##template); \
 871 }
 872
 873 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 874
 875 #undef __entry
 876 #define __entry REC
 877
 878 #undef __print_flags
 879 #undef __print_symbolic
 880 #undef __print_hex
 881 #undef __print_hex_str
 882 #undef __get_dynamic_array
 883 #undef __get_dynamic_array_len
 884 #undef __get_str
 885 #undef __get_bitmask
 886 #undef __get_rel_dynamic_array
 887 #undef __get_rel_dynamic_array_len
 888 #undef __get_rel_str
 889 #undef __get_rel_bitmask
 890 #undef __print_array
 891 #undef __print_hex_dump
 892
 893 /*
 894  * The below is not executed in the kernel. It is only what is
 895  * displayed in the print format for userspace to parse.
 896  */
 897 #undef __print_ns_to_secs
 898 #define __print_ns_to_secs(val) (val) / 1000000000UL
 899
 900 #undef __print_ns_without_secs
 901 #define __print_ns_without_secs(val) (val) % 1000000000UL
 902
 903 #undef TP_printk
 904 #define TP_printk(fmt, args...) "\"" fmt "\", "  __stringify(args)
 905
 906 #undef DECLARE_EVENT_CLASS
 907 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 908 _TRACE_PERF_PROTO(call, PARAMS(proto));                                 \
 909 static char print_fmt_##call[] = print;                                 \
 910 static struct trace_event_class __used __refdata event_class_##call = { \
 911         .system                 = TRACE_SYSTEM_STRING,                  \
 912         .fields_array           = trace_event_fields_##call,            \
 913         .fields                 = LIST_HEAD_INIT(event_class_##call.fields),\
 914         .raw_init               = trace_event_raw_init,                 \
 915         .probe                  = trace_event_raw_event_##call,         \
 916         .reg                    = trace_event_reg,                      \
 917         _TRACE_PERF_INIT(call)                                          \
 918 };
 919
 920 #undef DEFINE_EVENT
 921 #define DEFINE_EVENT(template, call, proto, args)                       \
 922                                                                         \
 923 static struct trace_event_call __used event_##call = {                  \
 924         .class                  = &event_class_##template,              \
 925         {                                                               \
 926                 .tp                     = &__tracepoint_##call,         \
 927         },                                                              \
 928         .event.funcs            = &trace_event_type_funcs_##template,   \
 929         .print_fmt              = print_fmt_##template,                 \
 930         .flags                  = TRACE_EVENT_FL_TRACEPOINT,            \
 931 };                                                                      \
 932 static struct trace_event_call __used                                   \
 933 __section("_ftrace_events") *__event_##call = &event_##call
 934
 935 #undef DEFINE_EVENT_PRINT
 936 #define DEFINE_EVENT_PRINT(template, call, proto, args, print)          \
 937                                                                         \
 938 static char print_fmt_##call[] = print;                                 \
 939                                                                         \
 940 static struct trace_event_call __used event_##call = {                  \
 941         .class                  = &event_class_##template,              \
 942         {                                                               \
 943                 .tp                     = &__tracepoint_##call,         \
 944         },                                                              \
 945         .event.funcs            = &trace_event_type_funcs_##call,       \
 946         .print_fmt              = print_fmt_##call,                     \
 947         .flags                  = TRACE_EVENT_FL_TRACEPOINT,            \
 948 };                                                                      \
 949 static struct trace_event_call __used                                   \
 950 __section("_ftrace_events") *__event_##call = &event_##call
 951
 952 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)