tracing: Remove special traces
[linux-2.6.git] / kernel / trace / trace.h
1 #ifndef _LINUX_KERNEL_TRACE_H
2 #define _LINUX_KERNEL_TRACE_H
3
4 #include <linux/fs.h>
5 #include <asm/atomic.h>
6 #include <linux/sched.h>
7 #include <linux/clocksource.h>
8 #include <linux/ring_buffer.h>
9 #include <linux/mmiotrace.h>
10 #include <linux/tracepoint.h>
11 #include <linux/ftrace.h>
12 #include <linux/hw_breakpoint.h>
13 #include <linux/trace_seq.h>
14 #include <linux/ftrace_event.h>
15
16 enum trace_type {
17         __TRACE_FIRST_TYPE = 0,
18
19         TRACE_FN,
20         TRACE_CTX,
21         TRACE_WAKE,
22         TRACE_STACK,
23         TRACE_PRINT,
24         TRACE_BPRINT,
25         TRACE_MMIO_RW,
26         TRACE_MMIO_MAP,
27         TRACE_BRANCH,
28         TRACE_GRAPH_RET,
29         TRACE_GRAPH_ENT,
30         TRACE_USER_STACK,
31         TRACE_BLK,
32
33         __TRACE_LAST_TYPE,
34 };
35
36
37 #undef __field
38 #define __field(type, item)             type    item;
39
40 #undef __field_struct
41 #define __field_struct(type, item)      __field(type, item)
42
43 #undef __field_desc
44 #define __field_desc(type, container, item)
45
46 #undef __array
47 #define __array(type, item, size)       type    item[size];
48
49 #undef __array_desc
50 #define __array_desc(type, container, item, size)
51
52 #undef __dynamic_array
53 #define __dynamic_array(type, item)     type    item[];
54
55 #undef F_STRUCT
56 #define F_STRUCT(args...)               args
57
58 #undef FTRACE_ENTRY
59 #define FTRACE_ENTRY(name, struct_name, id, tstruct, print)     \
60         struct struct_name {                                    \
61                 struct trace_entry      ent;                    \
62                 tstruct                                         \
63         }
64
65 #undef TP_ARGS
66 #define TP_ARGS(args...)        args
67
68 #undef FTRACE_ENTRY_DUP
69 #define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk)
70
71 #include "trace_entries.h"
72
73 /*
74  * syscalls are special, and need special handling, this is why
75  * they are not included in trace_entries.h
76  */
77 struct syscall_trace_enter {
78         struct trace_entry      ent;
79         int                     nr;
80         unsigned long           args[];
81 };
82
83 struct syscall_trace_exit {
84         struct trace_entry      ent;
85         int                     nr;
86         long                    ret;
87 };
88
89 struct kprobe_trace_entry_head {
90         struct trace_entry      ent;
91         unsigned long           ip;
92 };
93
94 struct kretprobe_trace_entry_head {
95         struct trace_entry      ent;
96         unsigned long           func;
97         unsigned long           ret_ip;
98 };
99
100 /*
101  * trace_flag_type is an enumeration that holds different
102  * states when a trace occurs. These are:
103  *  IRQS_OFF            - interrupts were disabled
104  *  IRQS_NOSUPPORT      - arch does not support irqs_disabled_flags
105  *  NEED_RESCHED        - reschedule is requested
106  *  HARDIRQ             - inside an interrupt handler
107  *  SOFTIRQ             - inside a softirq handler
108  */
109 enum trace_flag_type {
110         TRACE_FLAG_IRQS_OFF             = 0x01,
111         TRACE_FLAG_IRQS_NOSUPPORT       = 0x02,
112         TRACE_FLAG_NEED_RESCHED         = 0x04,
113         TRACE_FLAG_HARDIRQ              = 0x08,
114         TRACE_FLAG_SOFTIRQ              = 0x10,
115 };
116
117 #define TRACE_BUF_SIZE          1024
118
119 /*
120  * The CPU trace array - it consists of thousands of trace entries
121  * plus some other descriptor data: (for example which task started
122  * the trace, etc.)
123  */
124 struct trace_array_cpu {
125         atomic_t                disabled;
126         void                    *buffer_page;   /* ring buffer spare */
127
128         unsigned long           saved_latency;
129         unsigned long           critical_start;
130         unsigned long           critical_end;
131         unsigned long           critical_sequence;
132         unsigned long           nice;
133         unsigned long           policy;
134         unsigned long           rt_priority;
135         unsigned long           skipped_entries;
136         cycle_t                 preempt_timestamp;
137         pid_t                   pid;
138         uid_t                   uid;
139         char                    comm[TASK_COMM_LEN];
140 };
141
142 /*
143  * The trace array - an array of per-CPU trace arrays. This is the
144  * highest level data structure that individual tracers deal with.
145  * They have on/off state as well:
146  */
147 struct trace_array {
148         struct ring_buffer      *buffer;
149         unsigned long           entries;
150         int                     cpu;
151         cycle_t                 time_start;
152         struct task_struct      *waiter;
153         struct trace_array_cpu  *data[NR_CPUS];
154 };
155
156 #define FTRACE_CMP_TYPE(var, type) \
157         __builtin_types_compatible_p(typeof(var), type *)
158
159 #undef IF_ASSIGN
160 #define IF_ASSIGN(var, entry, etype, id)                \
161         if (FTRACE_CMP_TYPE(var, etype)) {              \
162                 var = (typeof(var))(entry);             \
163                 WARN_ON(id && (entry)->type != id);     \
164                 break;                                  \
165         }
166
167 /* Will cause compile errors if type is not found. */
168 extern void __ftrace_bad_type(void);
169
170 /*
171  * The trace_assign_type is a verifier that the entry type is
172  * the same as the type being assigned. To add new types simply
173  * add a line with the following format:
174  *
175  * IF_ASSIGN(var, ent, type, id);
176  *
177  *  Where "type" is the trace type that includes the trace_entry
178  *  as the "ent" item. And "id" is the trace identifier that is
179  *  used in the trace_type enum.
180  *
181  *  If the type can have more than one id, then use zero.
182  */
183 #define trace_assign_type(var, ent)                                     \
184         do {                                                            \
185                 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN);     \
186                 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0);        \
187                 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK);   \
188                 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\
189                 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT);   \
190                 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \
191                 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw,          \
192                           TRACE_MMIO_RW);                               \
193                 IF_ASSIGN(var, ent, struct trace_mmiotrace_map,         \
194                           TRACE_MMIO_MAP);                              \
195                 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \
196                 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry,      \
197                           TRACE_GRAPH_ENT);             \
198                 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry,      \
199                           TRACE_GRAPH_RET);             \
200                 __ftrace_bad_type();                                    \
201         } while (0)
202
203 /*
204  * An option specific to a tracer. This is a boolean value.
205  * The bit is the bit index that sets its value on the
206  * flags value in struct tracer_flags.
207  */
208 struct tracer_opt {
209         const char      *name; /* Will appear on the trace_options file */
210         u32             bit; /* Mask assigned in val field in tracer_flags */
211 };
212
213 /*
214  * The set of specific options for a tracer. Your tracer
215  * have to set the initial value of the flags val.
216  */
217 struct tracer_flags {
218         u32                     val;
219         struct tracer_opt       *opts;
220 };
221
222 /* Makes more easy to define a tracer opt */
223 #define TRACER_OPT(s, b)        .name = #s, .bit = b
224
225
226 /**
227  * struct tracer - a specific tracer and its callbacks to interact with debugfs
228  * @name: the name chosen to select it on the available_tracers file
229  * @init: called when one switches to this tracer (echo name > current_tracer)
230  * @reset: called when one switches to another tracer
231  * @start: called when tracing is unpaused (echo 1 > tracing_enabled)
232  * @stop: called when tracing is paused (echo 0 > tracing_enabled)
233  * @open: called when the trace file is opened
234  * @pipe_open: called when the trace_pipe file is opened
235  * @wait_pipe: override how the user waits for traces on trace_pipe
236  * @close: called when the trace file is released
237  * @pipe_close: called when the trace_pipe file is released
238  * @read: override the default read callback on trace_pipe
239  * @splice_read: override the default splice_read callback on trace_pipe
240  * @selftest: selftest to run on boot (see trace_selftest.c)
241  * @print_headers: override the first lines that describe your columns
242  * @print_line: callback that prints a trace
243  * @set_flag: signals one of your private flags changed (trace_options file)
244  * @flags: your private flags
245  */
246 struct tracer {
247         const char              *name;
248         int                     (*init)(struct trace_array *tr);
249         void                    (*reset)(struct trace_array *tr);
250         void                    (*start)(struct trace_array *tr);
251         void                    (*stop)(struct trace_array *tr);
252         void                    (*open)(struct trace_iterator *iter);
253         void                    (*pipe_open)(struct trace_iterator *iter);
254         void                    (*wait_pipe)(struct trace_iterator *iter);
255         void                    (*close)(struct trace_iterator *iter);
256         void                    (*pipe_close)(struct trace_iterator *iter);
257         ssize_t                 (*read)(struct trace_iterator *iter,
258                                         struct file *filp, char __user *ubuf,
259                                         size_t cnt, loff_t *ppos);
260         ssize_t                 (*splice_read)(struct trace_iterator *iter,
261                                                struct file *filp,
262                                                loff_t *ppos,
263                                                struct pipe_inode_info *pipe,
264                                                size_t len,
265                                                unsigned int flags);
266 #ifdef CONFIG_FTRACE_STARTUP_TEST
267         int                     (*selftest)(struct tracer *trace,
268                                             struct trace_array *tr);
269 #endif
270         void                    (*print_header)(struct seq_file *m);
271         enum print_line_t       (*print_line)(struct trace_iterator *iter);
272         /* If you handled the flag setting, return 0 */
273         int                     (*set_flag)(u32 old_flags, u32 bit, int set);
274         struct tracer           *next;
275         int                     print_max;
276         struct tracer_flags     *flags;
277 };
278
279
280 #define TRACE_PIPE_ALL_CPU      -1
281
282 int tracer_init(struct tracer *t, struct trace_array *tr);
283 int tracing_is_enabled(void);
284 void trace_wake_up(void);
285 void tracing_reset(struct trace_array *tr, int cpu);
286 void tracing_reset_online_cpus(struct trace_array *tr);
287 void tracing_reset_current(int cpu);
288 void tracing_reset_current_online_cpus(void);
289 int tracing_open_generic(struct inode *inode, struct file *filp);
290 struct dentry *trace_create_file(const char *name,
291                                  mode_t mode,
292                                  struct dentry *parent,
293                                  void *data,
294                                  const struct file_operations *fops);
295
296 struct dentry *tracing_init_dentry(void);
297
298 struct ring_buffer_event;
299
300 struct ring_buffer_event *
301 trace_buffer_lock_reserve(struct ring_buffer *buffer,
302                           int type,
303                           unsigned long len,
304                           unsigned long flags,
305                           int pc);
306 void trace_buffer_unlock_commit(struct ring_buffer *buffer,
307                                 struct ring_buffer_event *event,
308                                 unsigned long flags, int pc);
309
310 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,
311                                                 struct trace_array_cpu *data);
312
313 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter,
314                                           int *ent_cpu, u64 *ent_ts);
315
316 void default_wait_pipe(struct trace_iterator *iter);
317 void poll_wait_pipe(struct trace_iterator *iter);
318
319 void ftrace(struct trace_array *tr,
320                             struct trace_array_cpu *data,
321                             unsigned long ip,
322                             unsigned long parent_ip,
323                             unsigned long flags, int pc);
324 void tracing_sched_switch_trace(struct trace_array *tr,
325                                 struct task_struct *prev,
326                                 struct task_struct *next,
327                                 unsigned long flags, int pc);
328
329 void tracing_sched_wakeup_trace(struct trace_array *tr,
330                                 struct task_struct *wakee,
331                                 struct task_struct *cur,
332                                 unsigned long flags, int pc);
333 void trace_function(struct trace_array *tr,
334                     unsigned long ip,
335                     unsigned long parent_ip,
336                     unsigned long flags, int pc);
337 void trace_default_header(struct seq_file *m);
338 void print_trace_header(struct seq_file *m, struct trace_iterator *iter);
339 int trace_empty(struct trace_iterator *iter);
340
341 void trace_graph_return(struct ftrace_graph_ret *trace);
342 int trace_graph_entry(struct ftrace_graph_ent *trace);
343 void set_graph_array(struct trace_array *tr);
344
345 void tracing_start_cmdline_record(void);
346 void tracing_stop_cmdline_record(void);
347 void tracing_sched_switch_assign_trace(struct trace_array *tr);
348 void tracing_stop_sched_switch_record(void);
349 void tracing_start_sched_switch_record(void);
350 int register_tracer(struct tracer *type);
351 void unregister_tracer(struct tracer *type);
352 int is_tracing_stopped(void);
353
354 extern unsigned long nsecs_to_usecs(unsigned long nsecs);
355
356 extern unsigned long tracing_thresh;
357
358 #ifdef CONFIG_TRACER_MAX_TRACE
359 extern unsigned long tracing_max_latency;
360
361 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu);
362 void update_max_tr_single(struct trace_array *tr,
363                           struct task_struct *tsk, int cpu);
364 #endif /* CONFIG_TRACER_MAX_TRACE */
365
366 #ifdef CONFIG_STACKTRACE
367 void ftrace_trace_stack(struct ring_buffer *buffer, unsigned long flags,
368                         int skip, int pc);
369
370 void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags,
371                             int pc);
372
373 void __trace_stack(struct trace_array *tr, unsigned long flags, int skip,
374                    int pc);
375 #else
376 static inline void ftrace_trace_stack(struct ring_buffer *buffer,
377                                       unsigned long flags, int skip, int pc)
378 {
379 }
380
381 static inline void ftrace_trace_userstack(struct ring_buffer *buffer,
382                                           unsigned long flags, int pc)
383 {
384 }
385
386 static inline void __trace_stack(struct trace_array *tr, unsigned long flags,
387                                  int skip, int pc)
388 {
389 }
390 #endif /* CONFIG_STACKTRACE */
391
392 extern cycle_t ftrace_now(int cpu);
393
394 extern void trace_find_cmdline(int pid, char comm[]);
395
396 #ifdef CONFIG_DYNAMIC_FTRACE
397 extern unsigned long ftrace_update_tot_cnt;
398 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
399 extern int DYN_FTRACE_TEST_NAME(void);
400 #endif
401
402 extern int ring_buffer_expanded;
403 extern bool tracing_selftest_disabled;
404 DECLARE_PER_CPU(int, ftrace_cpu_disabled);
405
406 #ifdef CONFIG_FTRACE_STARTUP_TEST
407 extern int trace_selftest_startup_function(struct tracer *trace,
408                                            struct trace_array *tr);
409 extern int trace_selftest_startup_function_graph(struct tracer *trace,
410                                                  struct trace_array *tr);
411 extern int trace_selftest_startup_irqsoff(struct tracer *trace,
412                                           struct trace_array *tr);
413 extern int trace_selftest_startup_preemptoff(struct tracer *trace,
414                                              struct trace_array *tr);
415 extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace,
416                                                  struct trace_array *tr);
417 extern int trace_selftest_startup_wakeup(struct tracer *trace,
418                                          struct trace_array *tr);
419 extern int trace_selftest_startup_nop(struct tracer *trace,
420                                          struct trace_array *tr);
421 extern int trace_selftest_startup_sched_switch(struct tracer *trace,
422                                                struct trace_array *tr);
423 extern int trace_selftest_startup_branch(struct tracer *trace,
424                                          struct trace_array *tr);
425 #endif /* CONFIG_FTRACE_STARTUP_TEST */
426
427 extern void *head_page(struct trace_array_cpu *data);
428 extern unsigned long long ns2usecs(cycle_t nsec);
429 extern int
430 trace_vbprintk(unsigned long ip, const char *fmt, va_list args);
431 extern int
432 trace_vprintk(unsigned long ip, const char *fmt, va_list args);
433 extern int
434 trace_array_vprintk(struct trace_array *tr,
435                     unsigned long ip, const char *fmt, va_list args);
436 int trace_array_printk(struct trace_array *tr,
437                        unsigned long ip, const char *fmt, ...);
438
439 extern unsigned long trace_flags;
440
441 extern int trace_clock_id;
442
443 /* Standard output formatting function used for function return traces */
444 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
445
446 /* Flag options */
447 #define TRACE_GRAPH_PRINT_OVERRUN       0x1
448 #define TRACE_GRAPH_PRINT_CPU           0x2
449 #define TRACE_GRAPH_PRINT_OVERHEAD      0x4
450 #define TRACE_GRAPH_PRINT_PROC          0x8
451 #define TRACE_GRAPH_PRINT_DURATION      0x10
452 #define TRACE_GRAPH_PRINT_ABS_TIME      0x20
453
454 extern enum print_line_t
455 print_graph_function_flags(struct trace_iterator *iter, u32 flags);
456 extern void print_graph_headers_flags(struct seq_file *s, u32 flags);
457 extern enum print_line_t
458 trace_print_graph_duration(unsigned long long duration, struct trace_seq *s);
459 extern void graph_trace_open(struct trace_iterator *iter);
460 extern void graph_trace_close(struct trace_iterator *iter);
461 extern int __trace_graph_entry(struct trace_array *tr,
462                                struct ftrace_graph_ent *trace,
463                                unsigned long flags, int pc);
464 extern void __trace_graph_return(struct trace_array *tr,
465                                  struct ftrace_graph_ret *trace,
466                                  unsigned long flags, int pc);
467
468
469 #ifdef CONFIG_DYNAMIC_FTRACE
470 /* TODO: make this variable */
471 #define FTRACE_GRAPH_MAX_FUNCS          32
472 extern int ftrace_graph_filter_enabled;
473 extern int ftrace_graph_count;
474 extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS];
475
476 static inline int ftrace_graph_addr(unsigned long addr)
477 {
478         int i;
479
480         if (!ftrace_graph_filter_enabled)
481                 return 1;
482
483         for (i = 0; i < ftrace_graph_count; i++) {
484                 if (addr == ftrace_graph_funcs[i])
485                         return 1;
486         }
487
488         return 0;
489 }
490 #else
491 static inline int ftrace_graph_addr(unsigned long addr)
492 {
493         return 1;
494 }
495 #endif /* CONFIG_DYNAMIC_FTRACE */
496 #else /* CONFIG_FUNCTION_GRAPH_TRACER */
497 static inline enum print_line_t
498 print_graph_function_flags(struct trace_iterator *iter, u32 flags)
499 {
500         return TRACE_TYPE_UNHANDLED;
501 }
502 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
503
504 extern struct list_head ftrace_pids;
505
506 #ifdef CONFIG_FUNCTION_TRACER
507 static inline int ftrace_trace_task(struct task_struct *task)
508 {
509         if (list_empty(&ftrace_pids))
510                 return 1;
511
512         return test_tsk_trace_trace(task);
513 }
514 #else
515 static inline int ftrace_trace_task(struct task_struct *task)
516 {
517         return 1;
518 }
519 #endif
520
521 /*
522  * struct trace_parser - servers for reading the user input separated by spaces
523  * @cont: set if the input is not complete - no final space char was found
524  * @buffer: holds the parsed user input
525  * @idx: user input length
526  * @size: buffer size
527  */
528 struct trace_parser {
529         bool            cont;
530         char            *buffer;
531         unsigned        idx;
532         unsigned        size;
533 };
534
535 static inline bool trace_parser_loaded(struct trace_parser *parser)
536 {
537         return (parser->idx != 0);
538 }
539
540 static inline bool trace_parser_cont(struct trace_parser *parser)
541 {
542         return parser->cont;
543 }
544
545 static inline void trace_parser_clear(struct trace_parser *parser)
546 {
547         parser->cont = false;
548         parser->idx = 0;
549 }
550
551 extern int trace_parser_get_init(struct trace_parser *parser, int size);
552 extern void trace_parser_put(struct trace_parser *parser);
553 extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
554         size_t cnt, loff_t *ppos);
555
556 /*
557  * trace_iterator_flags is an enumeration that defines bit
558  * positions into trace_flags that controls the output.
559  *
560  * NOTE: These bits must match the trace_options array in
561  *       trace.c.
562  */
563 enum trace_iterator_flags {
564         TRACE_ITER_PRINT_PARENT         = 0x01,
565         TRACE_ITER_SYM_OFFSET           = 0x02,
566         TRACE_ITER_SYM_ADDR             = 0x04,
567         TRACE_ITER_VERBOSE              = 0x08,
568         TRACE_ITER_RAW                  = 0x10,
569         TRACE_ITER_HEX                  = 0x20,
570         TRACE_ITER_BIN                  = 0x40,
571         TRACE_ITER_BLOCK                = 0x80,
572         TRACE_ITER_STACKTRACE           = 0x100,
573         TRACE_ITER_PRINTK               = 0x200,
574         TRACE_ITER_PREEMPTONLY          = 0x400,
575         TRACE_ITER_BRANCH               = 0x800,
576         TRACE_ITER_ANNOTATE             = 0x1000,
577         TRACE_ITER_USERSTACKTRACE       = 0x2000,
578         TRACE_ITER_SYM_USEROBJ          = 0x4000,
579         TRACE_ITER_PRINTK_MSGONLY       = 0x8000,
580         TRACE_ITER_CONTEXT_INFO         = 0x10000, /* Print pid/cpu/time */
581         TRACE_ITER_LATENCY_FMT          = 0x20000,
582         TRACE_ITER_SLEEP_TIME           = 0x40000,
583         TRACE_ITER_GRAPH_TIME           = 0x80000,
584 };
585
586 /*
587  * TRACE_ITER_SYM_MASK masks the options in trace_flags that
588  * control the output of kernel symbols.
589  */
590 #define TRACE_ITER_SYM_MASK \
591         (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR)
592
593 extern struct tracer nop_trace;
594
595 #ifdef CONFIG_BRANCH_TRACER
596 extern int enable_branch_tracing(struct trace_array *tr);
597 extern void disable_branch_tracing(void);
598 static inline int trace_branch_enable(struct trace_array *tr)
599 {
600         if (trace_flags & TRACE_ITER_BRANCH)
601                 return enable_branch_tracing(tr);
602         return 0;
603 }
604 static inline void trace_branch_disable(void)
605 {
606         /* due to races, always disable */
607         disable_branch_tracing();
608 }
609 #else
610 static inline int trace_branch_enable(struct trace_array *tr)
611 {
612         return 0;
613 }
614 static inline void trace_branch_disable(void)
615 {
616 }
617 #endif /* CONFIG_BRANCH_TRACER */
618
619 /* set ring buffers to default size if not already done so */
620 int tracing_update_buffers(void);
621
622 /* trace event type bit fields, not numeric */
623 enum {
624         TRACE_EVENT_TYPE_PRINTF         = 1,
625         TRACE_EVENT_TYPE_RAW            = 2,
626 };
627
628 struct ftrace_event_field {
629         struct list_head        link;
630         char                    *name;
631         char                    *type;
632         int                     filter_type;
633         int                     offset;
634         int                     size;
635         int                     is_signed;
636 };
637
638 struct event_filter {
639         int                     n_preds;
640         struct filter_pred      **preds;
641         char                    *filter_string;
642 };
643
644 struct event_subsystem {
645         struct list_head        list;
646         const char              *name;
647         struct dentry           *entry;
648         struct event_filter     *filter;
649         int                     nr_events;
650 };
651
652 struct filter_pred;
653 struct regex;
654
655 typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event,
656                                  int val1, int val2);
657
658 typedef int (*regex_match_func)(char *str, struct regex *r, int len);
659
660 enum regex_type {
661         MATCH_FULL = 0,
662         MATCH_FRONT_ONLY,
663         MATCH_MIDDLE_ONLY,
664         MATCH_END_ONLY,
665 };
666
667 struct regex {
668         char                    pattern[MAX_FILTER_STR_VAL];
669         int                     len;
670         int                     field_len;
671         regex_match_func        match;
672 };
673
674 struct filter_pred {
675         filter_pred_fn_t        fn;
676         u64                     val;
677         struct regex            regex;
678         char                    *field_name;
679         int                     offset;
680         int                     not;
681         int                     op;
682         int                     pop_n;
683 };
684
685 extern struct list_head ftrace_common_fields;
686
687 extern enum regex_type
688 filter_parse_regex(char *buff, int len, char **search, int *not);
689 extern void print_event_filter(struct ftrace_event_call *call,
690                                struct trace_seq *s);
691 extern int apply_event_filter(struct ftrace_event_call *call,
692                               char *filter_string);
693 extern int apply_subsystem_event_filter(struct event_subsystem *system,
694                                         char *filter_string);
695 extern void print_subsystem_event_filter(struct event_subsystem *system,
696                                          struct trace_seq *s);
697 extern int filter_assign_type(const char *type);
698
699 struct list_head *
700 trace_get_fields(struct ftrace_event_call *event_call);
701
702 static inline int
703 filter_check_discard(struct ftrace_event_call *call, void *rec,
704                      struct ring_buffer *buffer,
705                      struct ring_buffer_event *event)
706 {
707         if (unlikely(call->flags & TRACE_EVENT_FL_FILTERED) &&
708             !filter_match_preds(call->filter, rec)) {
709                 ring_buffer_discard_commit(buffer, event);
710                 return 1;
711         }
712
713         return 0;
714 }
715
716 extern struct mutex event_mutex;
717 extern struct list_head ftrace_events;
718
719 extern const char *__start___trace_bprintk_fmt[];
720 extern const char *__stop___trace_bprintk_fmt[];
721
722 #undef FTRACE_ENTRY
723 #define FTRACE_ENTRY(call, struct_name, id, tstruct, print)             \
724         extern struct ftrace_event_call                                 \
725         __attribute__((__aligned__(4))) event_##call;
726 #undef FTRACE_ENTRY_DUP
727 #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print)         \
728         FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print))
729 #include "trace_entries.h"
730
731 #endif /* _LINUX_KERNEL_TRACE_H */