include/trace/trace

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

INCLUDED FROM
