kernel/include/linux/trace_events.h

   1
   2 #ifndef _LINUX_TRACE_EVENT_H
   3 #define _LINUX_TRACE_EVENT_H
   4
   5 #include <linux/ring_buffer.h>
   6 #include <linux/trace_seq.h>
   7 #include <linux/percpu.h>
   8 #include <linux/hardirq.h>
   9 #include <linux/perf_event.h>
  10 #include <linux/tracepoint.h>
  11
  12 struct trace_array;
  13 struct trace_buffer;
  14 struct tracer;
  15 struct dentry;
  16 struct bpf_prog;
  17
  18 struct trace_print_flags {
  19         unsigned long           mask;
  20         const char              *name;
  21 };
  22
  23 struct trace_print_flags_u64 {
  24         unsigned long long      mask;
  25         const char              *name;
  26 };
  27
  28 const char *trace_print_flags_seq(struct trace_seq *p, const char *delim,
  29                                   unsigned long flags,
  30                                   const struct trace_print_flags *flag_array);
  31
  32 const char *trace_print_symbols_seq(struct trace_seq *p, unsigned long val,
  33                                     const struct trace_print_flags *symbol_array);
  34
  35 #if BITS_PER_LONG == 32
  36 const char *trace_print_symbols_seq_u64(struct trace_seq *p,
  37                                         unsigned long long val,
  38                                         const struct trace_print_flags_u64
  39                                                                  *symbol_array);
  40 #endif
  41
  42 const char *trace_print_bitmask_seq(struct trace_seq *p, void *bitmask_ptr,
  43                                     unsigned int bitmask_size);
  44
  45 const char *trace_print_hex_seq(struct trace_seq *p,
  46                                 const unsigned char *buf, int len);
  47
  48 const char *trace_print_array_seq(struct trace_seq *p,
  49                                    const void *buf, int count,
  50                                    size_t el_size);
  51
  52 struct trace_iterator;
  53 struct trace_event;
  54
  55 int trace_raw_output_prep(struct trace_iterator *iter,
  56                           struct trace_event *event);
  57
  58 /*
  59  * The trace entry - the most basic unit of tracing. This is what
  60  * is printed in the end as a single line in the trace output, such as:
  61  *
  62  *     bash-15816 [01]   235.197585: idle_cpu <- irq_enter
  63  */
  64 struct trace_entry {
  65         unsigned short          type;
  66         unsigned char           flags;
  67         unsigned char           preempt_count;
  68         int                     pid;
  69         unsigned short          migrate_disable;
  70         unsigned short          padding;
  71         unsigned char           preempt_lazy_count;
  72 };
  73
  74 #define TRACE_EVENT_TYPE_MAX                                            \
  75         ((1 << (sizeof(((struct trace_entry *)0)->type) * 8)) - 1)
  76
  77 /*
  78  * Trace iterator - used by printout routines who present trace
  79  * results to users and which routines might sleep, etc:
  80  */
  81 struct trace_iterator {
  82         struct trace_array      *tr;
  83         struct tracer           *trace;
  84         struct trace_buffer     *trace_buffer;
  85         void                    *private;
  86         int                     cpu_file;
  87         struct mutex            mutex;
  88         struct ring_buffer_iter **buffer_iter;
  89         unsigned long           iter_flags;
  90
  91         /* trace_seq for __print_flags() and __print_symbolic() etc. */
  92         struct trace_seq        tmp_seq;
  93
  94         cpumask_var_t           started;
  95
  96         /* it's true when current open file is snapshot */
  97         bool                    snapshot;
  98
  99         /* The below is zeroed out in pipe_read */
 100         struct trace_seq        seq;
 101         struct trace_entry      *ent;
 102         unsigned long           lost_events;
 103         int                     leftover;
 104         int                     ent_size;
 105         int                     cpu;
 106         u64                     ts;
 107
 108         loff_t                  pos;
 109         long                    idx;
 110
 111         /* All new field here will be zeroed out in pipe_read */
 112 };
 113
 114 enum trace_iter_flags {
 115         TRACE_FILE_LAT_FMT      = 1,
 116         TRACE_FILE_ANNOTATE     = 2,
 117         TRACE_FILE_TIME_IN_NS   = 4,
 118 };
 119
 120
 121 typedef enum print_line_t (*trace_print_func)(struct trace_iterator *iter,
 122                                       int flags, struct trace_event *event);
 123
 124 struct trace_event_functions {
 125         trace_print_func        trace;
 126         trace_print_func        raw;
 127         trace_print_func        hex;
 128         trace_print_func        binary;
 129 };
 130
 131 struct trace_event {
 132         struct hlist_node               node;
 133         struct list_head                list;
 134         int                             type;
 135         struct trace_event_functions    *funcs;
 136 };
 137
 138 extern int register_trace_event(struct trace_event *event);
 139 extern int unregister_trace_event(struct trace_event *event);
 140
 141 /* Return values for print_line callback */
 142 enum print_line_t {
 143         TRACE_TYPE_PARTIAL_LINE = 0,    /* Retry after flushing the seq */
 144         TRACE_TYPE_HANDLED      = 1,
 145         TRACE_TYPE_UNHANDLED    = 2,    /* Relay to other output functions */
 146         TRACE_TYPE_NO_CONSUME   = 3     /* Handled but ask to not consume */
 147 };
 148
 149 /*
 150  * Several functions return TRACE_TYPE_PARTIAL_LINE if the trace_seq
 151  * overflowed, and TRACE_TYPE_HANDLED otherwise. This helper function
 152  * simplifies those functions and keeps them in sync.
 153  */
 154 static inline enum print_line_t trace_handle_return(struct trace_seq *s)
 155 {
 156         return trace_seq_has_overflowed(s) ?
 157                 TRACE_TYPE_PARTIAL_LINE : TRACE_TYPE_HANDLED;
 158 }
 159
 160 void tracing_generic_entry_update(struct trace_entry *entry,
 161                                   unsigned long flags,
 162                                   int pc);
 163 struct trace_event_file;
 164
 165 struct ring_buffer_event *
 166 trace_event_buffer_lock_reserve(struct ring_buffer **current_buffer,
 167                                 struct trace_event_file *trace_file,
 168                                 int type, unsigned long len,
 169                                 unsigned long flags, int pc);
 170 struct ring_buffer_event *
 171 trace_current_buffer_lock_reserve(struct ring_buffer **current_buffer,
 172                                   int type, unsigned long len,
 173                                   unsigned long flags, int pc);
 174 void trace_buffer_unlock_commit(struct trace_array *tr,
 175                                 struct ring_buffer *buffer,
 176                                 struct ring_buffer_event *event,
 177                                 unsigned long flags, int pc);
 178 void trace_buffer_unlock_commit_regs(struct trace_array *tr,
 179                                      struct ring_buffer *buffer,
 180                                      struct ring_buffer_event *event,
 181                                      unsigned long flags, int pc,
 182                                      struct pt_regs *regs);
 183 void trace_current_buffer_discard_commit(struct ring_buffer *buffer,
 184                                          struct ring_buffer_event *event);
 185
 186 void tracing_record_cmdline(struct task_struct *tsk);
 187
 188 int trace_output_call(struct trace_iterator *iter, char *name, char *fmt, ...);
 189
 190 struct event_filter;
 191
 192 enum trace_reg {
 193         TRACE_REG_REGISTER,
 194         TRACE_REG_UNREGISTER,
 195 #ifdef CONFIG_PERF_EVENTS
 196         TRACE_REG_PERF_REGISTER,
 197         TRACE_REG_PERF_UNREGISTER,
 198         TRACE_REG_PERF_OPEN,
 199         TRACE_REG_PERF_CLOSE,
 200         TRACE_REG_PERF_ADD,
 201         TRACE_REG_PERF_DEL,
 202 #endif
 203 };
 204
 205 struct trace_event_call;
 206
 207 struct trace_event_class {
 208         const char              *system;
 209         void                    *probe;
 210 #ifdef CONFIG_PERF_EVENTS
 211         void                    *perf_probe;
 212 #endif
 213         int                     (*reg)(struct trace_event_call *event,
 214                                        enum trace_reg type, void *data);
 215         int                     (*define_fields)(struct trace_event_call *);
 216         struct list_head        *(*get_fields)(struct trace_event_call *);
 217         struct list_head        fields;
 218         int                     (*raw_init)(struct trace_event_call *);
 219 };
 220
 221 extern int trace_event_reg(struct trace_event_call *event,
 222                             enum trace_reg type, void *data);
 223
 224 struct trace_event_buffer {
 225         struct ring_buffer              *buffer;
 226         struct ring_buffer_event        *event;
 227         struct trace_event_file         *trace_file;
 228         void                            *entry;
 229         unsigned long                   flags;
 230         int                             pc;
 231 };
 232
 233 void *trace_event_buffer_reserve(struct trace_event_buffer *fbuffer,
 234                                   struct trace_event_file *trace_file,
 235                                   unsigned long len);
 236
 237 void trace_event_buffer_commit(struct trace_event_buffer *fbuffer);
 238
 239 enum {
 240         TRACE_EVENT_FL_FILTERED_BIT,
 241         TRACE_EVENT_FL_CAP_ANY_BIT,
 242         TRACE_EVENT_FL_NO_SET_FILTER_BIT,
 243         TRACE_EVENT_FL_IGNORE_ENABLE_BIT,
 244         TRACE_EVENT_FL_WAS_ENABLED_BIT,
 245         TRACE_EVENT_FL_USE_CALL_FILTER_BIT,
 246         TRACE_EVENT_FL_TRACEPOINT_BIT,
 247         TRACE_EVENT_FL_KPROBE_BIT,
 248         TRACE_EVENT_FL_UPROBE_BIT,
 249 };
 250
 251 /*
 252  * Event flags:
 253  *  FILTERED      - The event has a filter attached
 254  *  CAP_ANY       - Any user can enable for perf
 255  *  NO_SET_FILTER - Set when filter has error and is to be ignored
 256  *  IGNORE_ENABLE - For trace internal events, do not enable with debugfs file
 257  *  WAS_ENABLED   - Set and stays set when an event was ever enabled
 258  *                    (used for module unloading, if a module event is enabled,
 259  *                     it is best to clear the buffers that used it).
 260  *  USE_CALL_FILTER - For trace internal events, don't use file filter
 261  *  TRACEPOINT    - Event is a tracepoint
 262  *  KPROBE        - Event is a kprobe
 263  *  UPROBE        - Event is a uprobe
 264  */
 265 enum {
 266         TRACE_EVENT_FL_FILTERED         = (1 << TRACE_EVENT_FL_FILTERED_BIT),
 267         TRACE_EVENT_FL_CAP_ANY          = (1 << TRACE_EVENT_FL_CAP_ANY_BIT),
 268         TRACE_EVENT_FL_NO_SET_FILTER    = (1 << TRACE_EVENT_FL_NO_SET_FILTER_BIT),
 269         TRACE_EVENT_FL_IGNORE_ENABLE    = (1 << TRACE_EVENT_FL_IGNORE_ENABLE_BIT),
 270         TRACE_EVENT_FL_WAS_ENABLED      = (1 << TRACE_EVENT_FL_WAS_ENABLED_BIT),
 271         TRACE_EVENT_FL_USE_CALL_FILTER  = (1 << TRACE_EVENT_FL_USE_CALL_FILTER_BIT),
 272         TRACE_EVENT_FL_TRACEPOINT       = (1 << TRACE_EVENT_FL_TRACEPOINT_BIT),
 273         TRACE_EVENT_FL_KPROBE           = (1 << TRACE_EVENT_FL_KPROBE_BIT),
 274         TRACE_EVENT_FL_UPROBE           = (1 << TRACE_EVENT_FL_UPROBE_BIT),
 275 };
 276
 277 #define TRACE_EVENT_FL_UKPROBE (TRACE_EVENT_FL_KPROBE | TRACE_EVENT_FL_UPROBE)
 278
 279 struct trace_event_call {
 280         struct list_head        list;
 281         struct trace_event_class *class;
 282         union {
 283                 char                    *name;
 284                 /* Set TRACE_EVENT_FL_TRACEPOINT flag when using "tp" */
 285                 struct tracepoint       *tp;
 286         };
 287         struct trace_event      event;
 288         char                    *print_fmt;
 289         struct event_filter     *filter;
 290         void                    *mod;
 291         void                    *data;
 292         /*
 293          *   bit 0:             filter_active
 294          *   bit 1:             allow trace by non root (cap any)
 295          *   bit 2:             failed to apply filter
 296          *   bit 3:             trace internal event (do not enable)
 297          *   bit 4:             Event was enabled by module
 298          *   bit 5:             use call filter rather than file filter
 299          *   bit 6:             Event is a tracepoint
 300          */
 301         int                     flags; /* static flags of different events */
 302
 303 #ifdef CONFIG_PERF_EVENTS
 304         int                             perf_refcount;
 305         struct hlist_head __percpu      *perf_events;
 306         struct bpf_prog                 *prog;
 307
 308         int     (*perf_perm)(struct trace_event_call *,
 309                              struct perf_event *);
 310 #endif
 311 };
 312
 313 static inline const char *
 314 trace_event_name(struct trace_event_call *call)
 315 {
 316         if (call->flags & TRACE_EVENT_FL_TRACEPOINT)
 317                 return call->tp ? call->tp->name : NULL;
 318         else
 319                 return call->name;
 320 }
 321
 322 struct trace_array;
 323 struct trace_subsystem_dir;
 324
 325 enum {
 326         EVENT_FILE_FL_ENABLED_BIT,
 327         EVENT_FILE_FL_RECORDED_CMD_BIT,
 328         EVENT_FILE_FL_FILTERED_BIT,
 329         EVENT_FILE_FL_NO_SET_FILTER_BIT,
 330         EVENT_FILE_FL_SOFT_MODE_BIT,
 331         EVENT_FILE_FL_SOFT_DISABLED_BIT,
 332         EVENT_FILE_FL_TRIGGER_MODE_BIT,
 333         EVENT_FILE_FL_TRIGGER_COND_BIT,
 334         EVENT_FILE_FL_PID_FILTER_BIT,
 335 };
 336
 337 /*
 338  * Event file flags:
 339  *  ENABLED       - The event is enabled
 340  *  RECORDED_CMD  - The comms should be recorded at sched_switch
 341  *  FILTERED      - The event has a filter attached
 342  *  NO_SET_FILTER - Set when filter has error and is to be ignored
 343  *  SOFT_MODE     - The event is enabled/disabled by SOFT_DISABLED
 344  *  SOFT_DISABLED - When set, do not trace the event (even though its
 345  *                   tracepoint may be enabled)
 346  *  TRIGGER_MODE  - When set, invoke the triggers associated with the event
 347  *  TRIGGER_COND  - When set, one or more triggers has an associated filter
 348  *  PID_FILTER    - When set, the event is filtered based on pid
 349  */
 350 enum {
 351         EVENT_FILE_FL_ENABLED           = (1 << EVENT_FILE_FL_ENABLED_BIT),
 352         EVENT_FILE_FL_RECORDED_CMD      = (1 << EVENT_FILE_FL_RECORDED_CMD_BIT),
 353         EVENT_FILE_FL_FILTERED          = (1 << EVENT_FILE_FL_FILTERED_BIT),
 354         EVENT_FILE_FL_NO_SET_FILTER     = (1 << EVENT_FILE_FL_NO_SET_FILTER_BIT),
 355         EVENT_FILE_FL_SOFT_MODE         = (1 << EVENT_FILE_FL_SOFT_MODE_BIT),
 356         EVENT_FILE_FL_SOFT_DISABLED     = (1 << EVENT_FILE_FL_SOFT_DISABLED_BIT),
 357         EVENT_FILE_FL_TRIGGER_MODE      = (1 << EVENT_FILE_FL_TRIGGER_MODE_BIT),
 358         EVENT_FILE_FL_TRIGGER_COND      = (1 << EVENT_FILE_FL_TRIGGER_COND_BIT),
 359         EVENT_FILE_FL_PID_FILTER        = (1 << EVENT_FILE_FL_PID_FILTER_BIT),
 360 };
 361
 362 struct trace_event_file {
 363         struct list_head                list;
 364         struct trace_event_call         *event_call;
 365         struct event_filter             *filter;
 366         struct dentry                   *dir;
 367         struct trace_array              *tr;
 368         struct trace_subsystem_dir      *system;
 369         struct list_head                triggers;
 370
 371         /*
 372          * 32 bit flags:
 373          *   bit 0:             enabled
 374          *   bit 1:             enabled cmd record
 375          *   bit 2:             enable/disable with the soft disable bit
 376          *   bit 3:             soft disabled
 377          *   bit 4:             trigger enabled
 378          *
 379          * Note: The bits must be set atomically to prevent races
 380          * from other writers. Reads of flags do not need to be in
 381          * sync as they occur in critical sections. But the way flags
 382          * is currently used, these changes do not affect the code
 383          * except that when a change is made, it may have a slight
 384          * delay in propagating the changes to other CPUs due to
 385          * caching and such. Which is mostly OK ;-)
 386          */
 387         unsigned long           flags;
 388         atomic_t                sm_ref; /* soft-mode reference counter */
 389         atomic_t                tm_ref; /* trigger-mode reference counter */
 390 };
 391
 392 #define __TRACE_EVENT_FLAGS(name, value)                                \
 393         static int __init trace_init_flags_##name(void)                 \
 394         {                                                               \
 395                 event_##name.flags |= value;                            \
 396                 return 0;                                               \
 397         }                                                               \
 398         early_initcall(trace_init_flags_##name);
 399
 400 #define __TRACE_EVENT_PERF_PERM(name, expr...)                          \
 401         static int perf_perm_##name(struct trace_event_call *tp_event, \
 402                                     struct perf_event *p_event)         \
 403         {                                                               \
 404                 return ({ expr; });                                     \
 405         }                                                               \
 406         static int __init trace_init_perf_perm_##name(void)             \
 407         {                                                               \
 408                 event_##name.perf_perm = &perf_perm_##name;             \
 409                 return 0;                                               \
 410         }                                                               \
 411         early_initcall(trace_init_perf_perm_##name);
 412
 413 #define PERF_MAX_TRACE_SIZE     2048
 414
 415 #define MAX_FILTER_STR_VAL      256     /* Should handle KSYM_SYMBOL_LEN */
 416
 417 enum event_trigger_type {
 418         ETT_NONE                = (0),
 419         ETT_TRACE_ONOFF         = (1 << 0),
 420         ETT_SNAPSHOT            = (1 << 1),
 421         ETT_STACKTRACE          = (1 << 2),
 422         ETT_EVENT_ENABLE        = (1 << 3),
 423 };
 424
 425 extern int filter_match_preds(struct event_filter *filter, void *rec);
 426
 427 extern int filter_check_discard(struct trace_event_file *file, void *rec,
 428                                 struct ring_buffer *buffer,
 429                                 struct ring_buffer_event *event);
 430 extern int call_filter_check_discard(struct trace_event_call *call, void *rec,
 431                                      struct ring_buffer *buffer,
 432                                      struct ring_buffer_event *event);
 433 extern enum event_trigger_type event_triggers_call(struct trace_event_file *file,
 434                                                    void *rec);
 435 extern void event_triggers_post_call(struct trace_event_file *file,
 436                                      enum event_trigger_type tt);
 437
 438 bool trace_event_ignore_this_pid(struct trace_event_file *trace_file);
 439
 440 /**
 441  * trace_trigger_soft_disabled - do triggers and test if soft disabled
 442  * @file: The file pointer of the event to test
 443  *
 444  * If any triggers without filters are attached to this event, they
 445  * will be called here. If the event is soft disabled and has no
 446  * triggers that require testing the fields, it will return true,
 447  * otherwise false.
 448  */
 449 static inline bool
 450 trace_trigger_soft_disabled(struct trace_event_file *file)
 451 {
 452         unsigned long eflags = file->flags;
 453
 454         if (!(eflags & EVENT_FILE_FL_TRIGGER_COND)) {
 455                 if (eflags & EVENT_FILE_FL_TRIGGER_MODE)
 456                         event_triggers_call(file, NULL);
 457                 if (eflags & EVENT_FILE_FL_SOFT_DISABLED)
 458                         return true;
 459                 if (eflags & EVENT_FILE_FL_PID_FILTER)
 460                         return trace_event_ignore_this_pid(file);
 461         }
 462         return false;
 463 }
 464
 465 /*
 466  * Helper function for event_trigger_unlock_commit{_regs}().
 467  * If there are event triggers attached to this event that requires
 468  * filtering against its fields, then they wil be called as the
 469  * entry already holds the field information of the current event.
 470  *
 471  * It also checks if the event should be discarded or not.
 472  * It is to be discarded if the event is soft disabled and the
 473  * event was only recorded to process triggers, or if the event
 474  * filter is active and this event did not match the filters.
 475  *
 476  * Returns true if the event is discarded, false otherwise.
 477  */
 478 static inline bool
 479 __event_trigger_test_discard(struct trace_event_file *file,
 480                              struct ring_buffer *buffer,
 481                              struct ring_buffer_event *event,
 482                              void *entry,
 483                              enum event_trigger_type *tt)
 484 {
 485         unsigned long eflags = file->flags;
 486
 487         if (eflags & EVENT_FILE_FL_TRIGGER_COND)
 488                 *tt = event_triggers_call(file, entry);
 489
 490         if (test_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags))
 491                 ring_buffer_discard_commit(buffer, event);
 492         else if (!filter_check_discard(file, entry, buffer, event))
 493                 return false;
 494
 495         return true;
 496 }
 497
 498 /**
 499  * event_trigger_unlock_commit - handle triggers and finish event commit
 500  * @file: The file pointer assoctiated to the event
 501  * @buffer: The ring buffer that the event is being written to
 502  * @event: The event meta data in the ring buffer
 503  * @entry: The event itself
 504  * @irq_flags: The state of the interrupts at the start of the event
 505  * @pc: The state of the preempt count at the start of the event.
 506  *
 507  * This is a helper function to handle triggers that require data
 508  * from the event itself. It also tests the event against filters and
 509  * if the event is soft disabled and should be discarded.
 510  */
 511 static inline void
 512 event_trigger_unlock_commit(struct trace_event_file *file,
 513                             struct ring_buffer *buffer,
 514                             struct ring_buffer_event *event,
 515                             void *entry, unsigned long irq_flags, int pc)
 516 {
 517         enum event_trigger_type tt = ETT_NONE;
 518
 519         if (!__event_trigger_test_discard(file, buffer, event, entry, &tt))
 520                 trace_buffer_unlock_commit(file->tr, buffer, event, irq_flags, pc);
 521
 522         if (tt)
 523                 event_triggers_post_call(file, tt);
 524 }
 525
 526 /**
 527  * event_trigger_unlock_commit_regs - handle triggers and finish event commit
 528  * @file: The file pointer assoctiated to the event
 529  * @buffer: The ring buffer that the event is being written to
 530  * @event: The event meta data in the ring buffer
 531  * @entry: The event itself
 532  * @irq_flags: The state of the interrupts at the start of the event
 533  * @pc: The state of the preempt count at the start of the event.
 534  *
 535  * This is a helper function to handle triggers that require data
 536  * from the event itself. It also tests the event against filters and
 537  * if the event is soft disabled and should be discarded.
 538  *
 539  * Same as event_trigger_unlock_commit() but calls
 540  * trace_buffer_unlock_commit_regs() instead of trace_buffer_unlock_commit().
 541  */
 542 static inline void
 543 event_trigger_unlock_commit_regs(struct trace_event_file *file,
 544                                  struct ring_buffer *buffer,
 545                                  struct ring_buffer_event *event,
 546                                  void *entry, unsigned long irq_flags, int pc,
 547                                  struct pt_regs *regs)
 548 {
 549         enum event_trigger_type tt = ETT_NONE;
 550
 551         if (!__event_trigger_test_discard(file, buffer, event, entry, &tt))
 552                 trace_buffer_unlock_commit_regs(file->tr, buffer, event,
 553                                                 irq_flags, pc, regs);
 554
 555         if (tt)
 556                 event_triggers_post_call(file, tt);
 557 }
 558
 559 #ifdef CONFIG_BPF_EVENTS
 560 unsigned int trace_call_bpf(struct bpf_prog *prog, void *ctx);
 561 #else
 562 static inline unsigned int trace_call_bpf(struct bpf_prog *prog, void *ctx)
 563 {
 564         return 1;
 565 }
 566 #endif
 567
 568 enum {
 569         FILTER_OTHER = 0,
 570         FILTER_STATIC_STRING,
 571         FILTER_DYN_STRING,
 572         FILTER_PTR_STRING,
 573         FILTER_TRACE_FN,
 574         FILTER_COMM,
 575         FILTER_CPU,
 576 };
 577
 578 extern int trace_event_raw_init(struct trace_event_call *call);
 579 extern int trace_define_field(struct trace_event_call *call, const char *type,
 580                               const char *name, int offset, int size,
 581                               int is_signed, int filter_type);
 582 extern int trace_add_event_call(struct trace_event_call *call);
 583 extern int trace_remove_event_call(struct trace_event_call *call);
 584
 585 #define is_signed_type(type)    (((type)(-1)) < (type)1)
 586
 587 int trace_set_clr_event(const char *system, const char *event, int set);
 588
 589 /*
 590  * The double __builtin_constant_p is because gcc will give us an error
 591  * if we try to allocate the static variable to fmt if it is not a
 592  * constant. Even with the outer if statement optimizing out.
 593  */
 594 #define event_trace_printk(ip, fmt, args...)                            \
 595 do {                                                                    \
 596         __trace_printk_check_format(fmt, ##args);                       \
 597         tracing_record_cmdline(current);                                \
 598         if (__builtin_constant_p(fmt)) {                                \
 599                 static const char *trace_printk_fmt                     \
 600                   __attribute__((section("__trace_printk_fmt"))) =      \
 601                         __builtin_constant_p(fmt) ? fmt : NULL;         \
 602                                                                         \
 603                 __trace_bprintk(ip, trace_printk_fmt, ##args);          \
 604         } else                                                          \
 605                 __trace_printk(ip, fmt, ##args);                        \
 606 } while (0)
 607
 608 #ifdef CONFIG_PERF_EVENTS
 609 struct perf_event;
 610
 611 DECLARE_PER_CPU(struct pt_regs, perf_trace_regs);
 612
 613 extern int  perf_trace_init(struct perf_event *event);
 614 extern void perf_trace_destroy(struct perf_event *event);
 615 extern int  perf_trace_add(struct perf_event *event, int flags);
 616 extern void perf_trace_del(struct perf_event *event, int flags);
 617 extern int  ftrace_profile_set_filter(struct perf_event *event, int event_id,
 618                                      char *filter_str);
 619 extern void ftrace_profile_free_filter(struct perf_event *event);
 620 extern void *perf_trace_buf_prepare(int size, unsigned short type,
 621                                     struct pt_regs **regs, int *rctxp);
 622
 623 static inline void
 624 perf_trace_buf_submit(void *raw_data, int size, int rctx, u64 addr,
 625                        u64 count, struct pt_regs *regs, void *head,
 626                        struct task_struct *task)
 627 {
 628         perf_tp_event(addr, count, raw_data, size, regs, head, rctx, task);
 629 }
 630 #endif
 631
 632 #endif /* _LINUX_TRACE_EVENT_H */