include/linux/ftrace_event.h

   1
   2 #ifndef _LINUX_FTRACE_EVENT_H
   3 #define _LINUX_FTRACE_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
  17 struct trace_print_flags {
  18         unsigned long           mask;
  19         const char              *name;
  20 };
  21
  22 struct trace_print_flags_u64 {
  23         unsigned long long      mask;
  24         const char              *name;
  25 };
  26
  27 const char *ftrace_print_flags_seq(struct trace_seq *p, const char *delim,
  28                                    unsigned long flags,
  29                                    const struct trace_print_flags *flag_array);
  30
  31 const char *ftrace_print_symbols_seq(struct trace_seq *p, unsigned long val,
  32                                      const struct trace_print_flags *symbol_array);
  33
  34 #if BITS_PER_LONG == 32
  35 const char *ftrace_print_symbols_seq_u64(struct trace_seq *p,
  36                                          unsigned long long val,
  37                                          const struct trace_print_flags_u64
  38                                                                  *symbol_array);
  39 #endif
  40
  41 const char *ftrace_print_bitmask_seq(struct trace_seq *p, void *bitmask_ptr,
  42                                      unsigned int bitmask_size);
  43
  44 const char *ftrace_print_hex_seq(struct trace_seq *p,
  45                                  const unsigned char *buf, int len);
  46
  47 const char *ftrace_print_array_seq(struct trace_seq *p,
  48                                    const void *buf, int buf_len,
  49                                    size_t el_size);
  50
  51 struct trace_iterator;
  52 struct trace_event;
  53
  54 int ftrace_raw_output_prep(struct trace_iterator *iter,
  55                            struct trace_event *event);
  56
  57 /*
  58  * The trace entry - the most basic unit of tracing. This is what
  59  * is printed in the end as a single line in the trace output, such as:
  60  *
  61  *     bash-15816 [01]   235.197585: idle_cpu <- irq_enter
  62  */
  63 struct trace_entry {
  64         unsigned short          type;
  65         unsigned char           flags;
  66         unsigned char           preempt_count;
  67         int                     pid;
  68 };
  69
  70 #define FTRACE_MAX_EVENT                                                \
  71         ((1 << (sizeof(((struct trace_entry *)0)->type) * 8)) - 1)
  72
  73 /*
  74  * Trace iterator - used by printout routines who present trace
  75  * results to users and which routines might sleep, etc:
  76  */
  77 struct trace_iterator {
  78         struct trace_array      *tr;
  79         struct tracer           *trace;
  80         struct trace_buffer     *trace_buffer;
  81         void                    *private;
  82         int                     cpu_file;
  83         struct mutex            mutex;
  84         struct ring_buffer_iter **buffer_iter;
  85         unsigned long           iter_flags;
  86
  87         /* trace_seq for __print_flags() and __print_symbolic() etc. */
  88         struct trace_seq        tmp_seq;
  89
  90         cpumask_var_t           started;
  91
  92         /* it's true when current open file is snapshot */
  93         bool                    snapshot;
  94
  95         /* The below is zeroed out in pipe_read */
  96         struct trace_seq        seq;
  97         struct trace_entry      *ent;
  98         unsigned long           lost_events;
  99         int                     leftover;
 100         int                     ent_size;
 101         int                     cpu;
 102         u64                     ts;
 103
 104         loff_t                  pos;
 105         long                    idx;
 106
 107         /* All new field here will be zeroed out in pipe_read */
 108 };
 109
 110 enum trace_iter_flags {
 111         TRACE_FILE_LAT_FMT      = 1,
 112         TRACE_FILE_ANNOTATE     = 2,
 113         TRACE_FILE_TIME_IN_NS   = 4,
 114 };
 115
 116
 117 typedef enum print_line_t (*trace_print_func)(struct trace_iterator *iter,
 118                                       int flags, struct trace_event *event);
 119
 120 struct trace_event_functions {
 121         trace_print_func        trace;
 122         trace_print_func        raw;
 123         trace_print_func        hex;
 124         trace_print_func        binary;
 125 };
 126
 127 struct trace_event {
 128         struct hlist_node               node;
 129         struct list_head                list;
 130         int                             type;
 131         struct trace_event_functions    *funcs;
 132 };
 133
 134 extern int register_ftrace_event(struct trace_event *event);
 135 extern int unregister_ftrace_event(struct trace_event *event);
 136
 137 /* Return values for print_line callback */
 138 enum print_line_t {
 139         TRACE_TYPE_PARTIAL_LINE = 0,    /* Retry after flushing the seq */
 140         TRACE_TYPE_HANDLED      = 1,
 141         TRACE_TYPE_UNHANDLED    = 2,    /* Relay to other output functions */
 142         TRACE_TYPE_NO_CONSUME   = 3     /* Handled but ask to not consume */
 143 };
 144
 145 /*
 146  * Several functions return TRACE_TYPE_PARTIAL_LINE if the trace_seq
 147  * overflowed, and TRACE_TYPE_HANDLED otherwise. This helper function
 148  * simplifies those functions and keeps them in sync.
 149  */
 150 static inline enum print_line_t trace_handle_return(struct trace_seq *s)
 151 {
 152         return trace_seq_has_overflowed(s) ?
 153                 TRACE_TYPE_PARTIAL_LINE : TRACE_TYPE_HANDLED;
 154 }
 155
 156 void tracing_generic_entry_update(struct trace_entry *entry,
 157                                   unsigned long flags,
 158                                   int pc);
 159 struct ftrace_event_file;
 160
 161 struct ring_buffer_event *
 162 trace_event_buffer_lock_reserve(struct ring_buffer **current_buffer,
 163                                 struct ftrace_event_file *ftrace_file,
 164                                 int type, unsigned long len,
 165                                 unsigned long flags, int pc);
 166 struct ring_buffer_event *
 167 trace_current_buffer_lock_reserve(struct ring_buffer **current_buffer,
 168                                   int type, unsigned long len,
 169                                   unsigned long flags, int pc);
 170 void trace_current_buffer_unlock_commit(struct ring_buffer *buffer,
 171                                         struct ring_buffer_event *event,
 172                                         unsigned long flags, int pc);
 173 void trace_buffer_unlock_commit(struct ring_buffer *buffer,
 174                                 struct ring_buffer_event *event,
 175                                 unsigned long flags, int pc);
 176 void trace_buffer_unlock_commit_regs(struct ring_buffer *buffer,
 177                                      struct ring_buffer_event *event,
 178                                      unsigned long flags, int pc,
 179                                      struct pt_regs *regs);
 180 void trace_current_buffer_discard_commit(struct ring_buffer *buffer,
 181                                          struct ring_buffer_event *event);
 182
 183 void tracing_record_cmdline(struct task_struct *tsk);
 184
 185 int ftrace_output_call(struct trace_iterator *iter, char *name, char *fmt, ...);
 186
 187 struct event_filter;
 188
 189 enum trace_reg {
 190         TRACE_REG_REGISTER,
 191         TRACE_REG_UNREGISTER,
 192 #ifdef CONFIG_PERF_EVENTS
 193         TRACE_REG_PERF_REGISTER,
 194         TRACE_REG_PERF_UNREGISTER,
 195         TRACE_REG_PERF_OPEN,
 196         TRACE_REG_PERF_CLOSE,
 197         TRACE_REG_PERF_ADD,
 198         TRACE_REG_PERF_DEL,
 199 #endif
 200 };
 201
 202 struct ftrace_event_call;
 203
 204 struct ftrace_event_class {
 205         char                    *system;
 206         void                    *probe;
 207 #ifdef CONFIG_PERF_EVENTS
 208         void                    *perf_probe;
 209 #endif
 210         int                     (*reg)(struct ftrace_event_call *event,
 211                                        enum trace_reg type, void *data);
 212         int                     (*define_fields)(struct ftrace_event_call *);
 213         struct list_head        *(*get_fields)(struct ftrace_event_call *);
 214         struct list_head        fields;
 215         int                     (*raw_init)(struct ftrace_event_call *);
 216 };
 217
 218 extern int ftrace_event_reg(struct ftrace_event_call *event,
 219                             enum trace_reg type, void *data);
 220
 221 int ftrace_output_event(struct trace_iterator *iter, struct ftrace_event_call *event,
 222                         char *fmt, ...);
 223
 224 int ftrace_event_define_field(struct ftrace_event_call *call,
 225                               char *type, int len, char *item, int offset,
 226                               int field_size, int sign, int filter);
 227
 228 struct ftrace_event_buffer {
 229         struct ring_buffer              *buffer;
 230         struct ring_buffer_event        *event;
 231         struct ftrace_event_file        *ftrace_file;
 232         void                            *entry;
 233         unsigned long                   flags;
 234         int                             pc;
 235 };
 236
 237 void *ftrace_event_buffer_reserve(struct ftrace_event_buffer *fbuffer,
 238                                   struct ftrace_event_file *ftrace_file,
 239                                   unsigned long len);
 240
 241 void ftrace_event_buffer_commit(struct ftrace_event_buffer *fbuffer);
 242
 243 int ftrace_event_define_field(struct ftrace_event_call *call,
 244                               char *type, int len, char *item, int offset,
 245                               int field_size, int sign, int filter);
 246
 247 enum {
 248         TRACE_EVENT_FL_FILTERED_BIT,
 249         TRACE_EVENT_FL_CAP_ANY_BIT,
 250         TRACE_EVENT_FL_NO_SET_FILTER_BIT,
 251         TRACE_EVENT_FL_IGNORE_ENABLE_BIT,
 252         TRACE_EVENT_FL_WAS_ENABLED_BIT,
 253         TRACE_EVENT_FL_USE_CALL_FILTER_BIT,
 254         TRACE_EVENT_FL_TRACEPOINT_BIT,
 255 };
 256
 257 /*
 258  * Event flags:
 259  *  FILTERED      - The event has a filter attached
 260  *  CAP_ANY       - Any user can enable for perf
 261  *  NO_SET_FILTER - Set when filter has error and is to be ignored
 262  *  IGNORE_ENABLE - For ftrace internal events, do not enable with debugfs file
 263  *  WAS_ENABLED   - Set and stays set when an event was ever enabled
 264  *                    (used for module unloading, if a module event is enabled,
 265  *                     it is best to clear the buffers that used it).
 266  *  USE_CALL_FILTER - For ftrace internal events, don't use file filter
 267  *  TRACEPOINT    - Event is a tracepoint
 268  */
 269 enum {
 270         TRACE_EVENT_FL_FILTERED         = (1 << TRACE_EVENT_FL_FILTERED_BIT),
 271         TRACE_EVENT_FL_CAP_ANY          = (1 << TRACE_EVENT_FL_CAP_ANY_BIT),
 272         TRACE_EVENT_FL_NO_SET_FILTER    = (1 << TRACE_EVENT_FL_NO_SET_FILTER_BIT),
 273         TRACE_EVENT_FL_IGNORE_ENABLE    = (1 << TRACE_EVENT_FL_IGNORE_ENABLE_BIT),
 274         TRACE_EVENT_FL_WAS_ENABLED      = (1 << TRACE_EVENT_FL_WAS_ENABLED_BIT),
 275         TRACE_EVENT_FL_USE_CALL_FILTER  = (1 << TRACE_EVENT_FL_USE_CALL_FILTER_BIT),
 276         TRACE_EVENT_FL_TRACEPOINT       = (1 << TRACE_EVENT_FL_TRACEPOINT_BIT),
 277 };
 278
 279 struct ftrace_event_call {
 280         struct list_head        list;
 281         struct ftrace_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         const 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:             ftrace 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
 307         int     (*perf_perm)(struct ftrace_event_call *,
 308                              struct perf_event *);
 309 #endif
 310 };
 311
 312 static inline const char *
 313 ftrace_event_name(struct ftrace_event_call *call)
 314 {
 315         if (call->flags & TRACE_EVENT_FL_TRACEPOINT)
 316                 return call->tp ? call->tp->name : NULL;
 317         else
 318                 return call->name;
 319 }
 320
 321 struct trace_array;
 322 struct ftrace_subsystem_dir;
 323
 324 enum {
 325         FTRACE_EVENT_FL_ENABLED_BIT,
 326         FTRACE_EVENT_FL_RECORDED_CMD_BIT,
 327         FTRACE_EVENT_FL_FILTERED_BIT,
 328         FTRACE_EVENT_FL_NO_SET_FILTER_BIT,
 329         FTRACE_EVENT_FL_SOFT_MODE_BIT,
 330         FTRACE_EVENT_FL_SOFT_DISABLED_BIT,
 331         FTRACE_EVENT_FL_TRIGGER_MODE_BIT,
 332         FTRACE_EVENT_FL_TRIGGER_COND_BIT,
 333 };
 334
 335 /*
 336  * Ftrace event file flags:
 337  *  ENABLED       - The event is enabled
 338  *  RECORDED_CMD  - The comms should be recorded at sched_switch
 339  *  FILTERED      - The event has a filter attached
 340  *  NO_SET_FILTER - Set when filter has error and is to be ignored
 341  *  SOFT_MODE     - The event is enabled/disabled by SOFT_DISABLED
 342  *  SOFT_DISABLED - When set, do not trace the event (even though its
 343  *                   tracepoint may be enabled)
 344  *  TRIGGER_MODE  - When set, invoke the triggers associated with the event
 345  *  TRIGGER_COND  - When set, one or more triggers has an associated filter
 346  */
 347 enum {
 348         FTRACE_EVENT_FL_ENABLED         = (1 << FTRACE_EVENT_FL_ENABLED_BIT),
 349         FTRACE_EVENT_FL_RECORDED_CMD    = (1 << FTRACE_EVENT_FL_RECORDED_CMD_BIT),
 350         FTRACE_EVENT_FL_FILTERED        = (1 << FTRACE_EVENT_FL_FILTERED_BIT),
 351         FTRACE_EVENT_FL_NO_SET_FILTER   = (1 << FTRACE_EVENT_FL_NO_SET_FILTER_BIT),
 352         FTRACE_EVENT_FL_SOFT_MODE       = (1 << FTRACE_EVENT_FL_SOFT_MODE_BIT),
 353         FTRACE_EVENT_FL_SOFT_DISABLED   = (1 << FTRACE_EVENT_FL_SOFT_DISABLED_BIT),
 354         FTRACE_EVENT_FL_TRIGGER_MODE    = (1 << FTRACE_EVENT_FL_TRIGGER_MODE_BIT),
 355         FTRACE_EVENT_FL_TRIGGER_COND    = (1 << FTRACE_EVENT_FL_TRIGGER_COND_BIT),
 356 };
 357
 358 struct ftrace_event_file {
 359         struct list_head                list;
 360         struct ftrace_event_call        *event_call;
 361         struct event_filter             *filter;
 362         struct dentry                   *dir;
 363         struct trace_array              *tr;
 364         struct ftrace_subsystem_dir     *system;
 365         struct list_head                triggers;
 366
 367         /*
 368          * 32 bit flags:
 369          *   bit 0:             enabled
 370          *   bit 1:             enabled cmd record
 371          *   bit 2:             enable/disable with the soft disable bit
 372          *   bit 3:             soft disabled
 373          *   bit 4:             trigger enabled
 374          *
 375          * Note: The bits must be set atomically to prevent races
 376          * from other writers. Reads of flags do not need to be in
 377          * sync as they occur in critical sections. But the way flags
 378          * is currently used, these changes do not affect the code
 379          * except that when a change is made, it may have a slight
 380          * delay in propagating the changes to other CPUs due to
 381          * caching and such. Which is mostly OK ;-)
 382          */
 383         unsigned long           flags;
 384         atomic_t                sm_ref; /* soft-mode reference counter */
 385         atomic_t                tm_ref; /* trigger-mode reference counter */
 386 };
 387
 388 #define __TRACE_EVENT_FLAGS(name, value)                                \
 389         static int __init trace_init_flags_##name(void)                 \
 390         {                                                               \
 391                 event_##name.flags |= value;                            \
 392                 return 0;                                               \
 393         }                                                               \
 394         early_initcall(trace_init_flags_##name);
 395
 396 #define __TRACE_EVENT_PERF_PERM(name, expr...)                          \
 397         static int perf_perm_##name(struct ftrace_event_call *tp_event, \
 398                                     struct perf_event *p_event)         \
 399         {                                                               \
 400                 return ({ expr; });                                     \
 401         }                                                               \
 402         static int __init trace_init_perf_perm_##name(void)             \
 403         {                                                               \
 404                 event_##name.perf_perm = &perf_perm_##name;             \
 405                 return 0;                                               \
 406         }                                                               \
 407         early_initcall(trace_init_perf_perm_##name);
 408
 409 #define PERF_MAX_TRACE_SIZE     2048
 410
 411 #define MAX_FILTER_STR_VAL      256     /* Should handle KSYM_SYMBOL_LEN */
 412
 413 enum event_trigger_type {
 414         ETT_NONE                = (0),
 415         ETT_TRACE_ONOFF         = (1 << 0),
 416         ETT_SNAPSHOT            = (1 << 1),
 417         ETT_STACKTRACE          = (1 << 2),
 418         ETT_EVENT_ENABLE        = (1 << 3),
 419 };
 420
 421 extern int filter_match_preds(struct event_filter *filter, void *rec);
 422
 423 extern int filter_check_discard(struct ftrace_event_file *file, void *rec,
 424                                 struct ring_buffer *buffer,
 425                                 struct ring_buffer_event *event);
 426 extern int call_filter_check_discard(struct ftrace_event_call *call, void *rec,
 427                                      struct ring_buffer *buffer,
 428                                      struct ring_buffer_event *event);
 429 extern enum event_trigger_type event_triggers_call(struct ftrace_event_file *file,
 430                                                    void *rec);
 431 extern void event_triggers_post_call(struct ftrace_event_file *file,
 432                                      enum event_trigger_type tt);
 433
 434 /**
 435  * ftrace_trigger_soft_disabled - do triggers and test if soft disabled
 436  * @file: The file pointer of the event to test
 437  *
 438  * If any triggers without filters are attached to this event, they
 439  * will be called here. If the event is soft disabled and has no
 440  * triggers that require testing the fields, it will return true,
 441  * otherwise false.
 442  */
 443 static inline bool
 444 ftrace_trigger_soft_disabled(struct ftrace_event_file *file)
 445 {
 446         unsigned long eflags = file->flags;
 447
 448         if (!(eflags & FTRACE_EVENT_FL_TRIGGER_COND)) {
 449                 if (eflags & FTRACE_EVENT_FL_TRIGGER_MODE)
 450                         event_triggers_call(file, NULL);
 451                 if (eflags & FTRACE_EVENT_FL_SOFT_DISABLED)
 452                         return true;
 453         }
 454         return false;
 455 }
 456
 457 /*
 458  * Helper function for event_trigger_unlock_commit{_regs}().
 459  * If there are event triggers attached to this event that requires
 460  * filtering against its fields, then they wil be called as the
 461  * entry already holds the field information of the current event.
 462  *
 463  * It also checks if the event should be discarded or not.
 464  * It is to be discarded if the event is soft disabled and the
 465  * event was only recorded to process triggers, or if the event
 466  * filter is active and this event did not match the filters.
 467  *
 468  * Returns true if the event is discarded, false otherwise.
 469  */
 470 static inline bool
 471 __event_trigger_test_discard(struct ftrace_event_file *file,
 472                              struct ring_buffer *buffer,
 473                              struct ring_buffer_event *event,
 474                              void *entry,
 475                              enum event_trigger_type *tt)
 476 {
 477         unsigned long eflags = file->flags;
 478
 479         if (eflags & FTRACE_EVENT_FL_TRIGGER_COND)
 480                 *tt = event_triggers_call(file, entry);
 481
 482         if (test_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &file->flags))
 483                 ring_buffer_discard_commit(buffer, event);
 484         else if (!filter_check_discard(file, entry, buffer, event))
 485                 return false;
 486
 487         return true;
 488 }
 489
 490 /**
 491  * event_trigger_unlock_commit - handle triggers and finish event commit
 492  * @file: The file pointer assoctiated to the event
 493  * @buffer: The ring buffer that the event is being written to
 494  * @event: The event meta data in the ring buffer
 495  * @entry: The event itself
 496  * @irq_flags: The state of the interrupts at the start of the event
 497  * @pc: The state of the preempt count at the start of the event.
 498  *
 499  * This is a helper function to handle triggers that require data
 500  * from the event itself. It also tests the event against filters and
 501  * if the event is soft disabled and should be discarded.
 502  */
 503 static inline void
 504 event_trigger_unlock_commit(struct ftrace_event_file *file,
 505                             struct ring_buffer *buffer,
 506                             struct ring_buffer_event *event,
 507                             void *entry, unsigned long irq_flags, int pc)
 508 {
 509         enum event_trigger_type tt = ETT_NONE;
 510
 511         if (!__event_trigger_test_discard(file, buffer, event, entry, &tt))
 512                 trace_buffer_unlock_commit(buffer, event, irq_flags, pc);
 513
 514         if (tt)
 515                 event_triggers_post_call(file, tt);
 516 }
 517
 518 /**
 519  * event_trigger_unlock_commit_regs - handle triggers and finish event commit
 520  * @file: The file pointer assoctiated to the event
 521  * @buffer: The ring buffer that the event is being written to
 522  * @event: The event meta data in the ring buffer
 523  * @entry: The event itself
 524  * @irq_flags: The state of the interrupts at the start of the event
 525  * @pc: The state of the preempt count at the start of the event.
 526  *
 527  * This is a helper function to handle triggers that require data
 528  * from the event itself. It also tests the event against filters and
 529  * if the event is soft disabled and should be discarded.
 530  *
 531  * Same as event_trigger_unlock_commit() but calls
 532  * trace_buffer_unlock_commit_regs() instead of trace_buffer_unlock_commit().
 533  */
 534 static inline void
 535 event_trigger_unlock_commit_regs(struct ftrace_event_file *file,
 536                                  struct ring_buffer *buffer,
 537                                  struct ring_buffer_event *event,
 538                                  void *entry, unsigned long irq_flags, int pc,
 539                                  struct pt_regs *regs)
 540 {
 541         enum event_trigger_type tt = ETT_NONE;
 542
 543         if (!__event_trigger_test_discard(file, buffer, event, entry, &tt))
 544                 trace_buffer_unlock_commit_regs(buffer, event,
 545                                                 irq_flags, pc, regs);
 546
 547         if (tt)
 548                 event_triggers_post_call(file, tt);
 549 }
 550
 551 enum {
 552         FILTER_OTHER = 0,
 553         FILTER_STATIC_STRING,
 554         FILTER_DYN_STRING,
 555         FILTER_PTR_STRING,
 556         FILTER_TRACE_FN,
 557 };
 558
 559 extern int trace_event_raw_init(struct ftrace_event_call *call);
 560 extern int trace_define_field(struct ftrace_event_call *call, const char *type,
 561                               const char *name, int offset, int size,
 562                               int is_signed, int filter_type);
 563 extern int trace_add_event_call(struct ftrace_event_call *call);
 564 extern int trace_remove_event_call(struct ftrace_event_call *call);
 565
 566 #define is_signed_type(type)    (((type)(-1)) < (type)1)
 567
 568 int trace_set_clr_event(const char *system, const char *event, int set);
 569
 570 /*
 571  * The double __builtin_constant_p is because gcc will give us an error
 572  * if we try to allocate the static variable to fmt if it is not a
 573  * constant. Even with the outer if statement optimizing out.
 574  */
 575 #define event_trace_printk(ip, fmt, args...)                            \
 576 do {                                                                    \
 577         __trace_printk_check_format(fmt, ##args);                       \
 578         tracing_record_cmdline(current);                                \
 579         if (__builtin_constant_p(fmt)) {                                \
 580                 static const char *trace_printk_fmt                     \
 581                   __attribute__((section("__trace_printk_fmt"))) =      \
 582                         __builtin_constant_p(fmt) ? fmt : NULL;         \
 583                                                                         \
 584                 __trace_bprintk(ip, trace_printk_fmt, ##args);          \
 585         } else                                                          \
 586                 __trace_printk(ip, fmt, ##args);                        \
 587 } while (0)
 588
 589 #ifdef CONFIG_PERF_EVENTS
 590 struct perf_event;
 591
 592 DECLARE_PER_CPU(struct pt_regs, perf_trace_regs);
 593
 594 extern int  perf_trace_init(struct perf_event *event);
 595 extern void perf_trace_destroy(struct perf_event *event);
 596 extern int  perf_trace_add(struct perf_event *event, int flags);
 597 extern void perf_trace_del(struct perf_event *event, int flags);
 598 extern int  ftrace_profile_set_filter(struct perf_event *event, int event_id,
 599                                      char *filter_str);
 600 extern void ftrace_profile_free_filter(struct perf_event *event);
 601 extern void *perf_trace_buf_prepare(int size, unsigned short type,
 602                                     struct pt_regs **regs, int *rctxp);
 603
 604 static inline void
 605 perf_trace_buf_submit(void *raw_data, int size, int rctx, u64 addr,
 606                        u64 count, struct pt_regs *regs, void *head,
 607                        struct task_struct *task)
 608 {
 609         perf_tp_event(addr, count, raw_data, size, regs, head, rctx, task);
 610 }
 611 #endif
 612
 613 #endif /* _LINUX_FTRACE_EVENT_H */