2114b4c1150f0ce8a9d9fcc6c3ae067bf6dd7fc2
[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_SPECIAL,
26         TRACE_MMIO_RW,
27         TRACE_MMIO_MAP,
28         TRACE_BRANCH,
29         TRACE_GRAPH_RET,
30         TRACE_GRAPH_ENT,
31         TRACE_USER_STACK,
32         TRACE_BLK,
33
34         __TRACE_LAST_TYPE,
35 };
36
37
38 #undef __field
39 #define __field(type, item)             type    item;
40
41 #undef __field_struct
42 #define __field_struct(type, item)      __field(type, item)
43
44 #undef __field_desc
45 #define __field_desc(type, container, item)
46
47 #undef __array
48 #define __array(type, item, size)       type    item[size];
49
50 #undef __array_desc
51 #define __array_desc(type, container, item, size)
52
53 #undef __dynamic_array
54 #define __dynamic_array(type, item)     type    item[];
55
56 #undef F_STRUCT
57 #define F_STRUCT(args...)               args
58
59 #undef FTRACE_ENTRY
60 #define FTRACE_ENTRY(name, struct_name, id, tstruct, print)     \
61         struct struct_name {                                    \
62                 struct trace_entry      ent;                    \
63                 tstruct                                         \
64         }
65
66 #undef TP_ARGS
67 #define TP_ARGS(args...)        args
68
69 #undef FTRACE_ENTRY_DUP
70 #define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk)
71
72 #include "trace_entries.h"
73
74 /*
75  * syscalls are special, and need special handling, this is why
76  * they are not included in trace_entries.h
77  */
78 struct syscall_trace_enter {
79         struct trace_entry      ent;
80         int                     nr;
81         unsigned long           args[];
82 };
83
84 struct syscall_trace_exit {
85         struct trace_entry      ent;
86         int                     nr;
87         long                    ret;
88 };
89
90 struct kprobe_trace_entry_head {
91         struct trace_entry      ent;
92         unsigned long           ip;
93 };
94
95 struct kretprobe_trace_entry_head {
96         struct trace_entry      ent;
97         unsigned long           func;
98         unsigned long           ret_ip;
99 };
100
101 /*
102  * trace_flag_type is an enumeration that holds different
103  * states when a trace occurs. These are:
104  *  IRQS_OFF            - interrupts were disabled
105  *  IRQS_NOSUPPORT      - arch does not support irqs_disabled_flags
106  *  NEED_RESCHED        - reschedule is requested
107  *  HARDIRQ             - inside an interrupt handler
108  *  SOFTIRQ             - inside a softirq handler
109  */
110 enum trace_flag_type {
111         TRACE_FLAG_IRQS_OFF             = 0x01,
112         TRACE_FLAG_IRQS_NOSUPPORT       = 0x02,
113         TRACE_FLAG_NEED_RESCHED         = 0x04,
114         TRACE_FLAG_HARDIRQ              = 0x08,
115         TRACE_FLAG_SOFTIRQ              = 0x10,
116 };
117
118 #define TRACE_BUF_SIZE          1024
119
120 /*
121  * The CPU trace array - it consists of thousands of trace entries
122  * plus some other descriptor data: (for example which task started
123  * the trace, etc.)
124  */
125 struct trace_array_cpu {
126         atomic_t                disabled;
127         void                    *buffer_page;   /* ring buffer spare */
128
129         unsigned long           saved_latency;
130         unsigned long           critical_start;
131         unsigned long           critical_end;
132         unsigned long           critical_sequence;
133         unsigned long           nice;
134         unsigned long           policy;
135         unsigned long           rt_priority;
136         unsigned long           skipped_entries;
137         cycle_t                 preempt_timestamp;
138         pid_t                   pid;
139         uid_t                   uid;
140         char                    comm[TASK_COMM_LEN];
141 };
142
143 /*
144  * The trace array - an array of per-CPU trace arrays. This is the
145  * highest level data structure that individual tracers deal with.
146  * They have on/off state as well:
147  */
148 struct trace_array {
149         struct ring_buffer      *buffer;
150         unsigned long           entries;
151         int                     cpu;
152         cycle_t                 time_start;
153         struct task_struct      *waiter;
154         struct trace_array_cpu  *data[NR_CPUS];
155 };
156
157 #define FTRACE_CMP_TYPE(var, type) \
158         __builtin_types_compatible_p(typeof(var), type *)
159
160 #undef IF_ASSIGN
161 #define IF_ASSIGN(var, entry, etype, id)                \
162         if (FTRACE_CMP_TYPE(var, etype)) {              \
163                 var = (typeof(var))(entry);             \
164                 WARN_ON(id && (entry)->type != id);     \
165                 break;                                  \
166         }
167
168 /* Will cause compile errors if type is not found. */
169 extern void __ftrace_bad_type(void);
170
171 /*
172  * The trace_assign_type is a verifier that the entry type is
173  * the same as the type being assigned. To add new types simply
174  * add a line with the following format:
175  *
176  * IF_ASSIGN(var, ent, type, id);
177  *
178  *  Where "type" is the trace type that includes the trace_entry
179  *  as the "ent" item. And "id" is the trace identifier that is
180  *  used in the trace_type enum.
181  *
182  *  If the type can have more than one id, then use zero.
183  */
184 #define trace_assign_type(var, ent)                                     \
185         do {                                                            \
186                 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN);     \
187                 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0);        \
188                 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK);   \
189                 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\
190                 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT);   \
191                 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \
192                 IF_ASSIGN(var, ent, struct special_entry, 0);           \
193                 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw,          \
194                           TRACE_MMIO_RW);                               \
195                 IF_ASSIGN(var, ent, struct trace_mmiotrace_map,         \
196                           TRACE_MMIO_MAP);                              \
197                 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \
198                 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry,      \
199                           TRACE_GRAPH_ENT);             \
200                 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry,      \
201                           TRACE_GRAPH_RET);             \
202                 __ftrace_bad_type();                                    \
203         } while (0)
204
205 /*
206  * An option specific to a tracer. This is a boolean value.
207  * The bit is the bit index that sets its value on the
208  * flags value in struct tracer_flags.
209  */
210 struct tracer_opt {
211         const char      *name; /* Will appear on the trace_options file */
212         u32             bit; /* Mask assigned in val field in tracer_flags */
213 };
214
215 /*
216  * The set of specific options for a tracer. Your tracer
217  * have to set the initial value of the flags val.
218  */
219 struct tracer_flags {
220         u32                     val;
221         struct tracer_opt       *opts;
222 };
223
224 /* Makes more easy to define a tracer opt */
225 #define TRACER_OPT(s, b)        .name = #s, .bit = b
226
227
228 /**
229  * struct tracer - a specific tracer and its callbacks to interact with debugfs
230  * @name: the name chosen to select it on the available_tracers file
231  * @init: called when one switches to this tracer (echo name > current_tracer)
232  * @reset: called when one switches to another tracer
233  * @start: called when tracing is unpaused (echo 1 > tracing_enabled)
234  * @stop: called when tracing is paused (echo 0 > tracing_enabled)
235  * @open: called when the trace file is opened
236  * @pipe_open: called when the trace_pipe file is opened
237  * @wait_pipe: override how the user waits for traces on trace_pipe
238  * @close: called when the trace file is released
239  * @pipe_close: called when the trace_pipe file is released
240  * @read: override the default read callback on trace_pipe
241  * @splice_read: override the default splice_read callback on trace_pipe
242  * @selftest: selftest to run on boot (see trace_selftest.c)
243  * @print_headers: override the first lines that describe your columns
244  * @print_line: callback that prints a trace
245  * @set_flag: signals one of your private flags changed (trace_options file)
246  * @flags: your private flags
247  */
248 struct tracer {
249         const char              *name;
250         int                     (*init)(struct trace_array *tr);
251         void                    (*reset)(struct trace_array *tr);
252         void                    (*start)(struct trace_array *tr);
253         void                    (*stop)(struct trace_array *tr);
254         void                    (*open)(struct trace_iterator *iter);
255         void                    (*pipe_open)(struct trace_iterator *iter);
256         void                    (*wait_pipe)(struct trace_iterator *iter);
257         void                    (*close)(struct trace_iterator *iter);
258         void                    (*pipe_close)(struct trace_iterator *iter);
259         ssize_t                 (*read)(struct trace_iterator *iter,
260                                         struct file *filp, char __user *ubuf,
261                                         size_t cnt, loff_t *ppos);
262         ssize_t                 (*splice_read)(struct trace_iterator *iter,
263                                                struct file *filp,
264                                                loff_t *ppos,
265                                                struct pipe_inode_info *pipe,
266                                                size_t len,
267                                                unsigned int flags);
268 #ifdef CONFIG_FTRACE_STARTUP_TEST
269         int                     (*selftest)(struct tracer *trace,
270                                             struct trace_array *tr);
271 #endif
272         void                    (*print_header)(struct seq_file *m);
273         enum print_line_t       (*print_line)(struct trace_iterator *iter);
274         /* If you handled the flag setting, return 0 */
275         int                     (*set_flag)(u32 old_flags, u32 bit, int set);
276         struct tracer           *next;
277         int                     print_max;
278         struct tracer_flags     *flags;
279 };
280
281
282 #define TRACE_PIPE_ALL_CPU      -1
283
284 int tracer_init(struct tracer *t, struct trace_array *tr);
285 int tracing_is_enabled(void);
286 void trace_wake_up(void);
287 void tracing_reset(struct trace_array *tr, int cpu);
288 void tracing_reset_online_cpus(struct trace_array *tr);
289 void tracing_reset_current(int cpu);
290 void tracing_reset_current_online_cpus(void);
291 int tracing_open_generic(struct inode *inode, struct file *filp);
292 struct dentry *trace_create_file(const char *name,
293                                  mode_t mode,
294                                  struct dentry *parent,
295                                  void *data,
296                                  const struct file_operations *fops);
297
298 struct dentry *tracing_init_dentry(void);
299
300 struct ring_buffer_event;
301
302 struct ring_buffer_event *
303 trace_buffer_lock_reserve(struct ring_buffer *buffer,
304                           int type,
305                           unsigned long len,
306                           unsigned long flags,
307                           int pc);
308 void trace_buffer_unlock_commit(struct ring_buffer *buffer,
309                                 struct ring_buffer_event *event,
310                                 unsigned long flags, int pc);
311
312 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,
313                                                 struct trace_array_cpu *data);
314
315 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter,
316                                           int *ent_cpu, u64 *ent_ts);
317
318 void default_wait_pipe(struct trace_iterator *iter);
319 void poll_wait_pipe(struct trace_iterator *iter);
320
321 void ftrace(struct trace_array *tr,
322                             struct trace_array_cpu *data,
323                             unsigned long ip,
324                             unsigned long parent_ip,
325                             unsigned long flags, int pc);
326 void tracing_sched_switch_trace(struct trace_array *tr,
327                                 struct task_struct *prev,
328                                 struct task_struct *next,
329                                 unsigned long flags, int pc);
330
331 void tracing_sched_wakeup_trace(struct trace_array *tr,
332                                 struct task_struct *wakee,
333                                 struct task_struct *cur,
334                                 unsigned long flags, int pc);
335 void trace_special(struct trace_array *tr,
336                    struct trace_array_cpu *data,
337                    unsigned long arg1,
338                    unsigned long arg2,
339                    unsigned long arg3, int pc);
340 void trace_function(struct trace_array *tr,
341                     unsigned long ip,
342                     unsigned long parent_ip,
343                     unsigned long flags, int pc);
344 void trace_default_header(struct seq_file *m);
345 void print_trace_header(struct seq_file *m, struct trace_iterator *iter);
346 int trace_empty(struct trace_iterator *iter);
347
348 void trace_graph_return(struct ftrace_graph_ret *trace);
349 int trace_graph_entry(struct ftrace_graph_ent *trace);
350 void set_graph_array(struct trace_array *tr);
351
352 void tracing_start_cmdline_record(void);
353 void tracing_stop_cmdline_record(void);
354 void tracing_sched_switch_assign_trace(struct trace_array *tr);
355 void tracing_stop_sched_switch_record(void);
356 void tracing_start_sched_switch_record(void);
357 int register_tracer(struct tracer *type);
358 void unregister_tracer(struct tracer *type);
359 int is_tracing_stopped(void);
360
361 extern unsigned long nsecs_to_usecs(unsigned long nsecs);
362
363 extern unsigned long tracing_thresh;
364
365 #ifdef CONFIG_TRACER_MAX_TRACE
366 extern unsigned long tracing_max_latency;
367
368 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu);
369 void update_max_tr_single(struct trace_array *tr,
370                           struct task_struct *tsk, int cpu);
371 #endif /* CONFIG_TRACER_MAX_TRACE */
372
373 #ifdef CONFIG_STACKTRACE
374 void ftrace_trace_stack(struct ring_buffer *buffer, unsigned long flags,
375                         int skip, int pc);
376
377 void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags,
378                             int pc);
379
380 void __trace_stack(struct trace_array *tr, unsigned long flags, int skip,
381                    int pc);
382 #else
383 static inline void ftrace_trace_stack(struct ring_buffer *buffer,
384                                       unsigned long flags, int skip, int pc)
385 {
386 }
387
388 static inline void ftrace_trace_userstack(struct ring_buffer *buffer,
389                                           unsigned long flags, int pc)
390 {
391 }
392
393 static inline void __trace_stack(struct trace_array *tr, unsigned long flags,
394                                  int skip, int pc)
395 {
396 }
397 #endif /* CONFIG_STACKTRACE */
398
399 extern cycle_t ftrace_now(int cpu);
400
401 extern void trace_find_cmdline(int pid, char comm[]);
402
403 #ifdef CONFIG_DYNAMIC_FTRACE
404 extern unsigned long ftrace_update_tot_cnt;
405 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
406 extern int DYN_FTRACE_TEST_NAME(void);
407 #endif
408
409 extern int ring_buffer_expanded;
410 extern bool tracing_selftest_disabled;
411 DECLARE_PER_CPU(int, ftrace_cpu_disabled);
412
413 #ifdef CONFIG_FTRACE_STARTUP_TEST
414 extern int trace_selftest_startup_function(struct tracer *trace,
415                                            struct trace_array *tr);
416 extern int trace_selftest_startup_function_graph(struct tracer *trace,
417                                                  struct trace_array *tr);
418 extern int trace_selftest_startup_irqsoff(struct tracer *trace,
419                                           struct trace_array *tr);
420 extern int trace_selftest_startup_preemptoff(struct tracer *trace,
421                                              struct trace_array *tr);
422 extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace,
423                                                  struct trace_array *tr);
424 extern int trace_selftest_startup_wakeup(struct tracer *trace,
425                                          struct trace_array *tr);
426 extern int trace_selftest_startup_nop(struct tracer *trace,
427                                          struct trace_array *tr);
428 extern int trace_selftest_startup_sched_switch(struct tracer *trace,
429                                                struct trace_array *tr);
430 extern int trace_selftest_startup_branch(struct tracer *trace,
431                                          struct trace_array *tr);
432 #endif /* CONFIG_FTRACE_STARTUP_TEST */
433
434 extern void *head_page(struct trace_array_cpu *data);
435 extern unsigned long long ns2usecs(cycle_t nsec);
436 extern int
437 trace_vbprintk(unsigned long ip, const char *fmt, va_list args);
438 extern int
439 trace_vprintk(unsigned long ip, const char *fmt, va_list args);
440 extern int
441 trace_array_vprintk(struct trace_array *tr,
442                     unsigned long ip, const char *fmt, va_list args);
443 int trace_array_printk(struct trace_array *tr,
444                        unsigned long ip, const char *fmt, ...);
445
446 extern unsigned long trace_flags;
447
448 extern int trace_clock_id;
449
450 /* Standard output formatting function used for function return traces */
451 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
452
453 /* Flag options */
454 #define TRACE_GRAPH_PRINT_OVERRUN       0x1
455 #define TRACE_GRAPH_PRINT_CPU           0x2
456 #define TRACE_GRAPH_PRINT_OVERHEAD      0x4
457 #define TRACE_GRAPH_PRINT_PROC          0x8
458 #define TRACE_GRAPH_PRINT_DURATION      0x10
459 #define TRACE_GRAPH_PRINT_ABS_TIME      0x20
460
461 extern enum print_line_t
462 print_graph_function_flags(struct trace_iterator *iter, u32 flags);
463 extern void print_graph_headers_flags(struct seq_file *s, u32 flags);
464 extern enum print_line_t
465 trace_print_graph_duration(unsigned long long duration, struct trace_seq *s);
466 extern void graph_trace_open(struct trace_iterator *iter);
467 extern void graph_trace_close(struct trace_iterator *iter);
468 extern int __trace_graph_entry(struct trace_array *tr,
469                                struct ftrace_graph_ent *trace,
470                                unsigned long flags, int pc);
471 extern void __trace_graph_return(struct trace_array *tr,
472                                  struct ftrace_graph_ret *trace,
473                                  unsigned long flags, int pc);
474
475
476 #ifdef CONFIG_DYNAMIC_FTRACE
477 /* TODO: make this variable */
478 #define FTRACE_GRAPH_MAX_FUNCS          32
479 extern int ftrace_graph_filter_enabled;
480 extern int ftrace_graph_count;
481 extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS];
482
483 static inline int ftrace_graph_addr(unsigned long addr)
484 {
485         int i;
486
487         if (!ftrace_graph_filter_enabled)
488                 return 1;
489
490         for (i = 0; i < ftrace_graph_count; i++) {
491                 if (addr == ftrace_graph_funcs[i])
492                         return 1;
493         }
494
495         return 0;
496 }
497 #else
498 static inline int ftrace_graph_addr(unsigned long addr)
499 {
500         return 1;
501 }
502 #endif /* CONFIG_DYNAMIC_FTRACE */
503 #else /* CONFIG_FUNCTION_GRAPH_TRACER */
504 static inline enum print_line_t
505 print_graph_function_flags(struct trace_iterator *iter, u32 flags)
506 {
507         return TRACE_TYPE_UNHANDLED;
508 }
509 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
510
511 extern struct list_head ftrace_pids;
512
513 #ifdef CONFIG_FUNCTION_TRACER
514 static inline int ftrace_trace_task(struct task_struct *task)
515 {
516         if (list_empty(&ftrace_pids))
517                 return 1;
518
519         return test_tsk_trace_trace(task);
520 }
521 #else
522 static inline int ftrace_trace_task(struct task_struct *task)
523 {
524         return 1;
525 }
526 #endif
527
528 /*
529  * struct trace_parser - servers for reading the user input separated by spaces
530  * @cont: set if the input is not complete - no final space char was found
531  * @buffer: holds the parsed user input
532  * @idx: user input length
533  * @size: buffer size
534  */
535 struct trace_parser {
536         bool            cont;
537         char            *buffer;
538         unsigned        idx;
539         unsigned        size;
540 };
541
542 static inline bool trace_parser_loaded(struct trace_parser *parser)
543 {
544         return (parser->idx != 0);
545 }
546
547 static inline bool trace_parser_cont(struct trace_parser *parser)
548 {
549         return parser->cont;
550 }
551
552 static inline void trace_parser_clear(struct trace_parser *parser)
553 {
554         parser->cont = false;
555         parser->idx = 0;
556 }
557
558 extern int trace_parser_get_init(struct trace_parser *parser, int size);
559 extern void trace_parser_put(struct trace_parser *parser);
560 extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
561         size_t cnt, loff_t *ppos);
562
563 /*
564  * trace_iterator_flags is an enumeration that defines bit
565  * positions into trace_flags that controls the output.
566  *
567  * NOTE: These bits must match the trace_options array in
568  *       trace.c.
569  */
570 enum trace_iterator_flags {
571         TRACE_ITER_PRINT_PARENT         = 0x01,
572         TRACE_ITER_SYM_OFFSET           = 0x02,
573         TRACE_ITER_SYM_ADDR             = 0x04,
574         TRACE_ITER_VERBOSE              = 0x08,
575         TRACE_ITER_RAW                  = 0x10,
576         TRACE_ITER_HEX                  = 0x20,
577         TRACE_ITER_BIN                  = 0x40,
578         TRACE_ITER_BLOCK                = 0x80,
579         TRACE_ITER_STACKTRACE           = 0x100,
580         TRACE_ITER_PRINTK               = 0x200,
581         TRACE_ITER_PREEMPTONLY          = 0x400,
582         TRACE_ITER_BRANCH               = 0x800,
583         TRACE_ITER_ANNOTATE             = 0x1000,
584         TRACE_ITER_USERSTACKTRACE       = 0x2000,
585         TRACE_ITER_SYM_USEROBJ          = 0x4000,
586         TRACE_ITER_PRINTK_MSGONLY       = 0x8000,
587         TRACE_ITER_CONTEXT_INFO         = 0x10000, /* Print pid/cpu/time */
588         TRACE_ITER_LATENCY_FMT          = 0x20000,
589         TRACE_ITER_SLEEP_TIME           = 0x40000,
590         TRACE_ITER_GRAPH_TIME           = 0x80000,
591 };
592
593 /*
594  * TRACE_ITER_SYM_MASK masks the options in trace_flags that
595  * control the output of kernel symbols.
596  */
597 #define TRACE_ITER_SYM_MASK \
598         (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR)
599
600 extern struct tracer nop_trace;
601
602 #ifdef CONFIG_BRANCH_TRACER
603 extern int enable_branch_tracing(struct trace_array *tr);
604 extern void disable_branch_tracing(void);
605 static inline int trace_branch_enable(struct trace_array *tr)
606 {
607         if (trace_flags & TRACE_ITER_BRANCH)
608                 return enable_branch_tracing(tr);
609         return 0;
610 }
611 static inline void trace_branch_disable(void)
612 {
613         /* due to races, always disable */
614         disable_branch_tracing();
615 }
616 #else
617 static inline int trace_branch_enable(struct trace_array *tr)
618 {
619         return 0;
620 }
621 static inline void trace_branch_disable(void)
622 {
623 }
624 #endif /* CONFIG_BRANCH_TRACER */
625
626 /* set ring buffers to default size if not already done so */
627 int tracing_update_buffers(void);
628
629 /* trace event type bit fields, not numeric */
630 enum {
631         TRACE_EVENT_TYPE_PRINTF         = 1,
632         TRACE_EVENT_TYPE_RAW            = 2,
633 };
634
635 struct ftrace_event_field {
636         struct list_head        link;
637         char                    *name;
638         char                    *type;
639         int                     filter_type;
640         int                     offset;
641         int                     size;
642         int                     is_signed;
643 };
644
645 struct event_filter {
646         int                     n_preds;
647         struct filter_pred      **preds;
648         char                    *filter_string;
649 };
650
651 struct event_subsystem {
652         struct list_head        list;
653         const char              *name;
654         struct dentry           *entry;
655         struct event_filter     *filter;
656         int                     nr_events;
657 };
658
659 struct filter_pred;
660 struct regex;
661
662 typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event,
663                                  int val1, int val2);
664
665 typedef int (*regex_match_func)(char *str, struct regex *r, int len);
666
667 enum regex_type {
668         MATCH_FULL = 0,
669         MATCH_FRONT_ONLY,
670         MATCH_MIDDLE_ONLY,
671         MATCH_END_ONLY,
672 };
673
674 struct regex {
675         char                    pattern[MAX_FILTER_STR_VAL];
676         int                     len;
677         int                     field_len;
678         regex_match_func        match;
679 };
680
681 struct filter_pred {
682         filter_pred_fn_t        fn;
683         u64                     val;
684         struct regex            regex;
685         char                    *field_name;
686         int                     offset;
687         int                     not;
688         int                     op;
689         int                     pop_n;
690 };
691
692 extern struct list_head ftrace_common_fields;
693
694 extern enum regex_type
695 filter_parse_regex(char *buff, int len, char **search, int *not);
696 extern void print_event_filter(struct ftrace_event_call *call,
697                                struct trace_seq *s);
698 extern int apply_event_filter(struct ftrace_event_call *call,
699                               char *filter_string);
700 extern int apply_subsystem_event_filter(struct event_subsystem *system,
701                                         char *filter_string);
702 extern void print_subsystem_event_filter(struct event_subsystem *system,
703                                          struct trace_seq *s);
704 extern int filter_assign_type(const char *type);
705
706 struct list_head *
707 trace_get_fields(struct ftrace_event_call *event_call);
708
709 static inline int
710 filter_check_discard(struct ftrace_event_call *call, void *rec,
711                      struct ring_buffer *buffer,
712                      struct ring_buffer_event *event)
713 {
714         if (unlikely(call->flags & TRACE_EVENT_FL_FILTERED) &&
715             !filter_match_preds(call->filter, rec)) {
716                 ring_buffer_discard_commit(buffer, event);
717                 return 1;
718         }
719
720         return 0;
721 }
722
723 extern struct mutex event_mutex;
724 extern struct list_head ftrace_events;
725
726 extern const char *__start___trace_bprintk_fmt[];
727 extern const char *__stop___trace_bprintk_fmt[];
728
729 #undef FTRACE_ENTRY
730 #define FTRACE_ENTRY(call, struct_name, id, tstruct, print)             \
731         extern struct ftrace_event_call                                 \
732         __attribute__((__aligned__(4))) event_##call;
733 #undef FTRACE_ENTRY_DUP
734 #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print)         \
735         FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print))
736 #include "trace_entries.h"
737
738 #endif /* _LINUX_KERNEL_TRACE_H */