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