Merge branch 'tip/perf/core' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt...
[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         int                     use_max_tr;
278 };
279
280
281 #define TRACE_PIPE_ALL_CPU      -1
282
283 int tracer_init(struct tracer *t, struct trace_array *tr);
284 int tracing_is_enabled(void);
285 void trace_wake_up(void);
286 void tracing_reset(struct trace_array *tr, int cpu);
287 void tracing_reset_online_cpus(struct trace_array *tr);
288 void tracing_reset_current(int cpu);
289 void tracing_reset_current_online_cpus(void);
290 int tracing_open_generic(struct inode *inode, struct file *filp);
291 struct dentry *trace_create_file(const char *name,
292                                  mode_t mode,
293                                  struct dentry *parent,
294                                  void *data,
295                                  const struct file_operations *fops);
296
297 struct dentry *tracing_init_dentry(void);
298
299 struct ring_buffer_event;
300
301 struct ring_buffer_event *
302 trace_buffer_lock_reserve(struct ring_buffer *buffer,
303                           int type,
304                           unsigned long len,
305                           unsigned long flags,
306                           int pc);
307 void trace_buffer_unlock_commit(struct ring_buffer *buffer,
308                                 struct ring_buffer_event *event,
309                                 unsigned long flags, int pc);
310
311 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,
312                                                 struct trace_array_cpu *data);
313
314 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter,
315                                           int *ent_cpu, u64 *ent_ts);
316
317 void default_wait_pipe(struct trace_iterator *iter);
318 void poll_wait_pipe(struct trace_iterator *iter);
319
320 void ftrace(struct trace_array *tr,
321                             struct trace_array_cpu *data,
322                             unsigned long ip,
323                             unsigned long parent_ip,
324                             unsigned long flags, int pc);
325 void tracing_sched_switch_trace(struct trace_array *tr,
326                                 struct task_struct *prev,
327                                 struct task_struct *next,
328                                 unsigned long flags, int pc);
329
330 void tracing_sched_wakeup_trace(struct trace_array *tr,
331                                 struct task_struct *wakee,
332                                 struct task_struct *cur,
333                                 unsigned long flags, int pc);
334 void trace_function(struct trace_array *tr,
335                     unsigned long ip,
336                     unsigned long parent_ip,
337                     unsigned long flags, int pc);
338 void trace_default_header(struct seq_file *m);
339 void print_trace_header(struct seq_file *m, struct trace_iterator *iter);
340 int trace_empty(struct trace_iterator *iter);
341
342 void trace_graph_return(struct ftrace_graph_ret *trace);
343 int trace_graph_entry(struct ftrace_graph_ent *trace);
344 void set_graph_array(struct trace_array *tr);
345
346 void tracing_start_cmdline_record(void);
347 void tracing_stop_cmdline_record(void);
348 void tracing_sched_switch_assign_trace(struct trace_array *tr);
349 void tracing_stop_sched_switch_record(void);
350 void tracing_start_sched_switch_record(void);
351 int register_tracer(struct tracer *type);
352 void unregister_tracer(struct tracer *type);
353 int is_tracing_stopped(void);
354
355 extern unsigned long nsecs_to_usecs(unsigned long nsecs);
356
357 extern unsigned long tracing_thresh;
358
359 #ifdef CONFIG_TRACER_MAX_TRACE
360 extern unsigned long tracing_max_latency;
361
362 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu);
363 void update_max_tr_single(struct trace_array *tr,
364                           struct task_struct *tsk, int cpu);
365 #endif /* CONFIG_TRACER_MAX_TRACE */
366
367 #ifdef CONFIG_STACKTRACE
368 void ftrace_trace_stack(struct ring_buffer *buffer, unsigned long flags,
369                         int skip, int pc);
370
371 void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags,
372                             int pc);
373
374 void __trace_stack(struct trace_array *tr, unsigned long flags, int skip,
375                    int pc);
376 #else
377 static inline void ftrace_trace_stack(struct ring_buffer *buffer,
378                                       unsigned long flags, int skip, int pc)
379 {
380 }
381
382 static inline void ftrace_trace_userstack(struct ring_buffer *buffer,
383                                           unsigned long flags, int pc)
384 {
385 }
386
387 static inline void __trace_stack(struct trace_array *tr, unsigned long flags,
388                                  int skip, int pc)
389 {
390 }
391 #endif /* CONFIG_STACKTRACE */
392
393 extern cycle_t ftrace_now(int cpu);
394
395 extern void trace_find_cmdline(int pid, char comm[]);
396
397 #ifdef CONFIG_DYNAMIC_FTRACE
398 extern unsigned long ftrace_update_tot_cnt;
399 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
400 extern int DYN_FTRACE_TEST_NAME(void);
401 #endif
402
403 extern int ring_buffer_expanded;
404 extern bool tracing_selftest_disabled;
405 DECLARE_PER_CPU(int, ftrace_cpu_disabled);
406
407 #ifdef CONFIG_FTRACE_STARTUP_TEST
408 extern int trace_selftest_startup_function(struct tracer *trace,
409                                            struct trace_array *tr);
410 extern int trace_selftest_startup_function_graph(struct tracer *trace,
411                                                  struct trace_array *tr);
412 extern int trace_selftest_startup_irqsoff(struct tracer *trace,
413                                           struct trace_array *tr);
414 extern int trace_selftest_startup_preemptoff(struct tracer *trace,
415                                              struct trace_array *tr);
416 extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace,
417                                                  struct trace_array *tr);
418 extern int trace_selftest_startup_wakeup(struct tracer *trace,
419                                          struct trace_array *tr);
420 extern int trace_selftest_startup_nop(struct tracer *trace,
421                                          struct trace_array *tr);
422 extern int trace_selftest_startup_sched_switch(struct tracer *trace,
423                                                struct trace_array *tr);
424 extern int trace_selftest_startup_branch(struct tracer *trace,
425                                          struct trace_array *tr);
426 #endif /* CONFIG_FTRACE_STARTUP_TEST */
427
428 extern void *head_page(struct trace_array_cpu *data);
429 extern unsigned long long ns2usecs(cycle_t nsec);
430 extern int
431 trace_vbprintk(unsigned long ip, const char *fmt, va_list args);
432 extern int
433 trace_vprintk(unsigned long ip, const char *fmt, va_list args);
434 extern int
435 trace_array_vprintk(struct trace_array *tr,
436                     unsigned long ip, const char *fmt, va_list args);
437 int trace_array_printk(struct trace_array *tr,
438                        unsigned long ip, const char *fmt, ...);
439
440 extern unsigned long trace_flags;
441
442 extern int trace_clock_id;
443
444 /* Standard output formatting function used for function return traces */
445 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
446
447 /* Flag options */
448 #define TRACE_GRAPH_PRINT_OVERRUN       0x1
449 #define TRACE_GRAPH_PRINT_CPU           0x2
450 #define TRACE_GRAPH_PRINT_OVERHEAD      0x4
451 #define TRACE_GRAPH_PRINT_PROC          0x8
452 #define TRACE_GRAPH_PRINT_DURATION      0x10
453 #define TRACE_GRAPH_PRINT_ABS_TIME      0x20
454
455 extern enum print_line_t
456 print_graph_function_flags(struct trace_iterator *iter, u32 flags);
457 extern void print_graph_headers_flags(struct seq_file *s, u32 flags);
458 extern enum print_line_t
459 trace_print_graph_duration(unsigned long long duration, struct trace_seq *s);
460 extern void graph_trace_open(struct trace_iterator *iter);
461 extern void graph_trace_close(struct trace_iterator *iter);
462 extern int __trace_graph_entry(struct trace_array *tr,
463                                struct ftrace_graph_ent *trace,
464                                unsigned long flags, int pc);
465 extern void __trace_graph_return(struct trace_array *tr,
466                                  struct ftrace_graph_ret *trace,
467                                  unsigned long flags, int pc);
468
469
470 #ifdef CONFIG_DYNAMIC_FTRACE
471 /* TODO: make this variable */
472 #define FTRACE_GRAPH_MAX_FUNCS          32
473 extern int ftrace_graph_filter_enabled;
474 extern int ftrace_graph_count;
475 extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS];
476
477 static inline int ftrace_graph_addr(unsigned long addr)
478 {
479         int i;
480
481         if (!ftrace_graph_filter_enabled)
482                 return 1;
483
484         for (i = 0; i < ftrace_graph_count; i++) {
485                 if (addr == ftrace_graph_funcs[i])
486                         return 1;
487         }
488
489         return 0;
490 }
491 #else
492 static inline int ftrace_graph_addr(unsigned long addr)
493 {
494         return 1;
495 }
496 #endif /* CONFIG_DYNAMIC_FTRACE */
497 #else /* CONFIG_FUNCTION_GRAPH_TRACER */
498 static inline enum print_line_t
499 print_graph_function_flags(struct trace_iterator *iter, u32 flags)
500 {
501         return TRACE_TYPE_UNHANDLED;
502 }
503 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
504
505 extern struct list_head ftrace_pids;
506
507 #ifdef CONFIG_FUNCTION_TRACER
508 static inline int ftrace_trace_task(struct task_struct *task)
509 {
510         if (list_empty(&ftrace_pids))
511                 return 1;
512
513         return test_tsk_trace_trace(task);
514 }
515 #else
516 static inline int ftrace_trace_task(struct task_struct *task)
517 {
518         return 1;
519 }
520 #endif
521
522 /*
523  * struct trace_parser - servers for reading the user input separated by spaces
524  * @cont: set if the input is not complete - no final space char was found
525  * @buffer: holds the parsed user input
526  * @idx: user input length
527  * @size: buffer size
528  */
529 struct trace_parser {
530         bool            cont;
531         char            *buffer;
532         unsigned        idx;
533         unsigned        size;
534 };
535
536 static inline bool trace_parser_loaded(struct trace_parser *parser)
537 {
538         return (parser->idx != 0);
539 }
540
541 static inline bool trace_parser_cont(struct trace_parser *parser)
542 {
543         return parser->cont;
544 }
545
546 static inline void trace_parser_clear(struct trace_parser *parser)
547 {
548         parser->cont = false;
549         parser->idx = 0;
550 }
551
552 extern int trace_parser_get_init(struct trace_parser *parser, int size);
553 extern void trace_parser_put(struct trace_parser *parser);
554 extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
555         size_t cnt, loff_t *ppos);
556
557 /*
558  * trace_iterator_flags is an enumeration that defines bit
559  * positions into trace_flags that controls the output.
560  *
561  * NOTE: These bits must match the trace_options array in
562  *       trace.c.
563  */
564 enum trace_iterator_flags {
565         TRACE_ITER_PRINT_PARENT         = 0x01,
566         TRACE_ITER_SYM_OFFSET           = 0x02,
567         TRACE_ITER_SYM_ADDR             = 0x04,
568         TRACE_ITER_VERBOSE              = 0x08,
569         TRACE_ITER_RAW                  = 0x10,
570         TRACE_ITER_HEX                  = 0x20,
571         TRACE_ITER_BIN                  = 0x40,
572         TRACE_ITER_BLOCK                = 0x80,
573         TRACE_ITER_STACKTRACE           = 0x100,
574         TRACE_ITER_PRINTK               = 0x200,
575         TRACE_ITER_PREEMPTONLY          = 0x400,
576         TRACE_ITER_BRANCH               = 0x800,
577         TRACE_ITER_ANNOTATE             = 0x1000,
578         TRACE_ITER_USERSTACKTRACE       = 0x2000,
579         TRACE_ITER_SYM_USEROBJ          = 0x4000,
580         TRACE_ITER_PRINTK_MSGONLY       = 0x8000,
581         TRACE_ITER_CONTEXT_INFO         = 0x10000, /* Print pid/cpu/time */
582         TRACE_ITER_LATENCY_FMT          = 0x20000,
583         TRACE_ITER_SLEEP_TIME           = 0x40000,
584         TRACE_ITER_GRAPH_TIME           = 0x80000,
585         TRACE_ITER_RECORD_CMD           = 0x100000,
586 };
587
588 /*
589  * TRACE_ITER_SYM_MASK masks the options in trace_flags that
590  * control the output of kernel symbols.
591  */
592 #define TRACE_ITER_SYM_MASK \
593         (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR)
594
595 extern struct tracer nop_trace;
596
597 #ifdef CONFIG_BRANCH_TRACER
598 extern int enable_branch_tracing(struct trace_array *tr);
599 extern void disable_branch_tracing(void);
600 static inline int trace_branch_enable(struct trace_array *tr)
601 {
602         if (trace_flags & TRACE_ITER_BRANCH)
603                 return enable_branch_tracing(tr);
604         return 0;
605 }
606 static inline void trace_branch_disable(void)
607 {
608         /* due to races, always disable */
609         disable_branch_tracing();
610 }
611 #else
612 static inline int trace_branch_enable(struct trace_array *tr)
613 {
614         return 0;
615 }
616 static inline void trace_branch_disable(void)
617 {
618 }
619 #endif /* CONFIG_BRANCH_TRACER */
620
621 /* set ring buffers to default size if not already done so */
622 int tracing_update_buffers(void);
623
624 /* trace event type bit fields, not numeric */
625 enum {
626         TRACE_EVENT_TYPE_PRINTF         = 1,
627         TRACE_EVENT_TYPE_RAW            = 2,
628 };
629
630 struct ftrace_event_field {
631         struct list_head        link;
632         char                    *name;
633         char                    *type;
634         int                     filter_type;
635         int                     offset;
636         int                     size;
637         int                     is_signed;
638 };
639
640 struct event_filter {
641         int                     n_preds;
642         struct filter_pred      **preds;
643         char                    *filter_string;
644 };
645
646 struct event_subsystem {
647         struct list_head        list;
648         const char              *name;
649         struct dentry           *entry;
650         struct event_filter     *filter;
651         int                     nr_events;
652 };
653
654 struct filter_pred;
655 struct regex;
656
657 typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event,
658                                  int val1, int val2);
659
660 typedef int (*regex_match_func)(char *str, struct regex *r, int len);
661
662 enum regex_type {
663         MATCH_FULL = 0,
664         MATCH_FRONT_ONLY,
665         MATCH_MIDDLE_ONLY,
666         MATCH_END_ONLY,
667 };
668
669 struct regex {
670         char                    pattern[MAX_FILTER_STR_VAL];
671         int                     len;
672         int                     field_len;
673         regex_match_func        match;
674 };
675
676 struct filter_pred {
677         filter_pred_fn_t        fn;
678         u64                     val;
679         struct regex            regex;
680         char                    *field_name;
681         int                     offset;
682         int                     not;
683         int                     op;
684         int                     pop_n;
685 };
686
687 extern struct list_head ftrace_common_fields;
688
689 extern enum regex_type
690 filter_parse_regex(char *buff, int len, char **search, int *not);
691 extern void print_event_filter(struct ftrace_event_call *call,
692                                struct trace_seq *s);
693 extern int apply_event_filter(struct ftrace_event_call *call,
694                               char *filter_string);
695 extern int apply_subsystem_event_filter(struct event_subsystem *system,
696                                         char *filter_string);
697 extern void print_subsystem_event_filter(struct event_subsystem *system,
698                                          struct trace_seq *s);
699 extern int filter_assign_type(const char *type);
700
701 struct list_head *
702 trace_get_fields(struct ftrace_event_call *event_call);
703
704 static inline int
705 filter_check_discard(struct ftrace_event_call *call, void *rec,
706                      struct ring_buffer *buffer,
707                      struct ring_buffer_event *event)
708 {
709         if (unlikely(call->flags & TRACE_EVENT_FL_FILTERED) &&
710             !filter_match_preds(call->filter, rec)) {
711                 ring_buffer_discard_commit(buffer, event);
712                 return 1;
713         }
714
715         return 0;
716 }
717
718 extern void trace_event_enable_cmd_record(bool enable);
719
720 extern struct mutex event_mutex;
721 extern struct list_head ftrace_events;
722
723 extern const char *__start___trace_bprintk_fmt[];
724 extern const char *__stop___trace_bprintk_fmt[];
725
726 #undef FTRACE_ENTRY
727 #define FTRACE_ENTRY(call, struct_name, id, tstruct, print)             \
728         extern struct ftrace_event_call                                 \
729         __attribute__((__aligned__(4))) event_##call;
730 #undef FTRACE_ENTRY_DUP
731 #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print)         \
732         FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print))
733 #include "trace_entries.h"
734
735 #endif /* _LINUX_KERNEL_TRACE_H */