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