cc90ccdad4697e7984969a20a39fc149ede379f9
[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         TRACE_KSYM,
34
35         __TRACE_LAST_TYPE,
36 };
37
38
39 #undef __field
40 #define __field(type, item)             type    item;
41
42 #undef __field_struct
43 #define __field_struct(type, item)      __field(type, item)
44
45 #undef __field_desc
46 #define __field_desc(type, container, item)
47
48 #undef __array
49 #define __array(type, item, size)       type    item[size];
50
51 #undef __array_desc
52 #define __array_desc(type, container, item, size)
53
54 #undef __dynamic_array
55 #define __dynamic_array(type, item)     type    item[];
56
57 #undef F_STRUCT
58 #define F_STRUCT(args...)               args
59
60 #undef FTRACE_ENTRY
61 #define FTRACE_ENTRY(name, struct_name, id, tstruct, print)     \
62         struct struct_name {                                    \
63                 struct trace_entry      ent;                    \
64                 tstruct                                         \
65         }
66
67 #undef TP_ARGS
68 #define TP_ARGS(args...)        args
69
70 #undef FTRACE_ENTRY_DUP
71 #define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk)
72
73 #include "trace_entries.h"
74
75 /*
76  * syscalls are special, and need special handling, this is why
77  * they are not included in trace_entries.h
78  */
79 struct syscall_trace_enter {
80         struct trace_entry      ent;
81         int                     nr;
82         unsigned long           args[];
83 };
84
85 struct syscall_trace_exit {
86         struct trace_entry      ent;
87         int                     nr;
88         long                    ret;
89 };
90
91 struct kprobe_trace_entry_head {
92         struct trace_entry      ent;
93         unsigned long           ip;
94 };
95
96 struct kretprobe_trace_entry_head {
97         struct trace_entry      ent;
98         unsigned long           func;
99         unsigned long           ret_ip;
100 };
101
102 /*
103  * trace_flag_type is an enumeration that holds different
104  * states when a trace occurs. These are:
105  *  IRQS_OFF            - interrupts were disabled
106  *  IRQS_NOSUPPORT      - arch does not support irqs_disabled_flags
107  *  NEED_RESCHED        - reschedule is requested
108  *  HARDIRQ             - inside an interrupt handler
109  *  SOFTIRQ             - inside a softirq handler
110  */
111 enum trace_flag_type {
112         TRACE_FLAG_IRQS_OFF             = 0x01,
113         TRACE_FLAG_IRQS_NOSUPPORT       = 0x02,
114         TRACE_FLAG_NEED_RESCHED         = 0x04,
115         TRACE_FLAG_HARDIRQ              = 0x08,
116         TRACE_FLAG_SOFTIRQ              = 0x10,
117 };
118
119 #define TRACE_BUF_SIZE          1024
120
121 /*
122  * The CPU trace array - it consists of thousands of trace entries
123  * plus some other descriptor data: (for example which task started
124  * the trace, etc.)
125  */
126 struct trace_array_cpu {
127         atomic_t                disabled;
128         void                    *buffer_page;   /* ring buffer spare */
129
130         unsigned long           saved_latency;
131         unsigned long           critical_start;
132         unsigned long           critical_end;
133         unsigned long           critical_sequence;
134         unsigned long           nice;
135         unsigned long           policy;
136         unsigned long           rt_priority;
137         unsigned long           skipped_entries;
138         cycle_t                 preempt_timestamp;
139         pid_t                   pid;
140         uid_t                   uid;
141         char                    comm[TASK_COMM_LEN];
142 };
143
144 /*
145  * The trace array - an array of per-CPU trace arrays. This is the
146  * highest level data structure that individual tracers deal with.
147  * They have on/off state as well:
148  */
149 struct trace_array {
150         struct ring_buffer      *buffer;
151         unsigned long           entries;
152         int                     cpu;
153         cycle_t                 time_start;
154         struct task_struct      *waiter;
155         struct trace_array_cpu  *data[NR_CPUS];
156 };
157
158 #define FTRACE_CMP_TYPE(var, type) \
159         __builtin_types_compatible_p(typeof(var), type *)
160
161 #undef IF_ASSIGN
162 #define IF_ASSIGN(var, entry, etype, id)                \
163         if (FTRACE_CMP_TYPE(var, etype)) {              \
164                 var = (typeof(var))(entry);             \
165                 WARN_ON(id && (entry)->type != id);     \
166                 break;                                  \
167         }
168
169 /* Will cause compile errors if type is not found. */
170 extern void __ftrace_bad_type(void);
171
172 /*
173  * The trace_assign_type is a verifier that the entry type is
174  * the same as the type being assigned. To add new types simply
175  * add a line with the following format:
176  *
177  * IF_ASSIGN(var, ent, type, id);
178  *
179  *  Where "type" is the trace type that includes the trace_entry
180  *  as the "ent" item. And "id" is the trace identifier that is
181  *  used in the trace_type enum.
182  *
183  *  If the type can have more than one id, then use zero.
184  */
185 #define trace_assign_type(var, ent)                                     \
186         do {                                                            \
187                 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN);     \
188                 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0);        \
189                 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK);   \
190                 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\
191                 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT);   \
192                 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \
193                 IF_ASSIGN(var, ent, struct special_entry, 0);           \
194                 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw,          \
195                           TRACE_MMIO_RW);                               \
196                 IF_ASSIGN(var, ent, struct trace_mmiotrace_map,         \
197                           TRACE_MMIO_MAP);                              \
198                 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \
199                 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry,      \
200                           TRACE_GRAPH_ENT);             \
201                 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry,      \
202                           TRACE_GRAPH_RET);             \
203                 IF_ASSIGN(var, ent, struct ksym_trace_entry, TRACE_KSYM);\
204                 __ftrace_bad_type();                                    \
205         } while (0)
206
207 /*
208  * An option specific to a tracer. This is a boolean value.
209  * The bit is the bit index that sets its value on the
210  * flags value in struct tracer_flags.
211  */
212 struct tracer_opt {
213         const char      *name; /* Will appear on the trace_options file */
214         u32             bit; /* Mask assigned in val field in tracer_flags */
215 };
216
217 /*
218  * The set of specific options for a tracer. Your tracer
219  * have to set the initial value of the flags val.
220  */
221 struct tracer_flags {
222         u32                     val;
223         struct tracer_opt       *opts;
224 };
225
226 /* Makes more easy to define a tracer opt */
227 #define TRACER_OPT(s, b)        .name = #s, .bit = b
228
229
230 /**
231  * struct tracer - a specific tracer and its callbacks to interact with debugfs
232  * @name: the name chosen to select it on the available_tracers file
233  * @init: called when one switches to this tracer (echo name > current_tracer)
234  * @reset: called when one switches to another tracer
235  * @start: called when tracing is unpaused (echo 1 > tracing_enabled)
236  * @stop: called when tracing is paused (echo 0 > tracing_enabled)
237  * @open: called when the trace file is opened
238  * @pipe_open: called when the trace_pipe file is opened
239  * @wait_pipe: override how the user waits for traces on trace_pipe
240  * @close: called when the trace file is released
241  * @pipe_close: called when the trace_pipe file is released
242  * @read: override the default read callback on trace_pipe
243  * @splice_read: override the default splice_read callback on trace_pipe
244  * @selftest: selftest to run on boot (see trace_selftest.c)
245  * @print_headers: override the first lines that describe your columns
246  * @print_line: callback that prints a trace
247  * @set_flag: signals one of your private flags changed (trace_options file)
248  * @flags: your private flags
249  */
250 struct tracer {
251         const char              *name;
252         int                     (*init)(struct trace_array *tr);
253         void                    (*reset)(struct trace_array *tr);
254         void                    (*start)(struct trace_array *tr);
255         void                    (*stop)(struct trace_array *tr);
256         void                    (*open)(struct trace_iterator *iter);
257         void                    (*pipe_open)(struct trace_iterator *iter);
258         void                    (*wait_pipe)(struct trace_iterator *iter);
259         void                    (*close)(struct trace_iterator *iter);
260         void                    (*pipe_close)(struct trace_iterator *iter);
261         ssize_t                 (*read)(struct trace_iterator *iter,
262                                         struct file *filp, char __user *ubuf,
263                                         size_t cnt, loff_t *ppos);
264         ssize_t                 (*splice_read)(struct trace_iterator *iter,
265                                                struct file *filp,
266                                                loff_t *ppos,
267                                                struct pipe_inode_info *pipe,
268                                                size_t len,
269                                                unsigned int flags);
270 #ifdef CONFIG_FTRACE_STARTUP_TEST
271         int                     (*selftest)(struct tracer *trace,
272                                             struct trace_array *tr);
273 #endif
274         void                    (*print_header)(struct seq_file *m);
275         enum print_line_t       (*print_line)(struct trace_iterator *iter);
276         /* If you handled the flag setting, return 0 */
277         int                     (*set_flag)(u32 old_flags, u32 bit, int set);
278         struct tracer           *next;
279         int                     print_max;
280         struct tracer_flags     *flags;
281 };
282
283
284 #define TRACE_PIPE_ALL_CPU      -1
285
286 int tracer_init(struct tracer *t, struct trace_array *tr);
287 int tracing_is_enabled(void);
288 void trace_wake_up(void);
289 void tracing_reset(struct trace_array *tr, int cpu);
290 void tracing_reset_online_cpus(struct trace_array *tr);
291 void tracing_reset_current(int cpu);
292 void tracing_reset_current_online_cpus(void);
293 int tracing_open_generic(struct inode *inode, struct file *filp);
294 struct dentry *trace_create_file(const char *name,
295                                  mode_t mode,
296                                  struct dentry *parent,
297                                  void *data,
298                                  const struct file_operations *fops);
299
300 struct dentry *tracing_init_dentry(void);
301 void init_tracer_sysprof_debugfs(struct dentry *d_tracer);
302
303 struct ring_buffer_event;
304
305 struct ring_buffer_event *
306 trace_buffer_lock_reserve(struct ring_buffer *buffer,
307                           int type,
308                           unsigned long len,
309                           unsigned long flags,
310                           int pc);
311 void trace_buffer_unlock_commit(struct ring_buffer *buffer,
312                                 struct ring_buffer_event *event,
313                                 unsigned long flags, int pc);
314
315 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,
316                                                 struct trace_array_cpu *data);
317
318 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter,
319                                           int *ent_cpu, u64 *ent_ts);
320
321 void default_wait_pipe(struct trace_iterator *iter);
322 void poll_wait_pipe(struct trace_iterator *iter);
323
324 void ftrace(struct trace_array *tr,
325                             struct trace_array_cpu *data,
326                             unsigned long ip,
327                             unsigned long parent_ip,
328                             unsigned long flags, int pc);
329 void tracing_sched_switch_trace(struct trace_array *tr,
330                                 struct task_struct *prev,
331                                 struct task_struct *next,
332                                 unsigned long flags, int pc);
333
334 void tracing_sched_wakeup_trace(struct trace_array *tr,
335                                 struct task_struct *wakee,
336                                 struct task_struct *cur,
337                                 unsigned long flags, int pc);
338 void trace_special(struct trace_array *tr,
339                    struct trace_array_cpu *data,
340                    unsigned long arg1,
341                    unsigned long arg2,
342                    unsigned long arg3, int pc);
343 void trace_function(struct trace_array *tr,
344                     unsigned long ip,
345                     unsigned long parent_ip,
346                     unsigned long flags, int pc);
347 void trace_default_header(struct seq_file *m);
348 void print_trace_header(struct seq_file *m, struct trace_iterator *iter);
349 int trace_empty(struct trace_iterator *iter);
350
351 void trace_graph_return(struct ftrace_graph_ret *trace);
352 int trace_graph_entry(struct ftrace_graph_ent *trace);
353 void set_graph_array(struct trace_array *tr);
354
355 void tracing_start_cmdline_record(void);
356 void tracing_stop_cmdline_record(void);
357 void tracing_sched_switch_assign_trace(struct trace_array *tr);
358 void tracing_stop_sched_switch_record(void);
359 void tracing_start_sched_switch_record(void);
360 int register_tracer(struct tracer *type);
361 void unregister_tracer(struct tracer *type);
362 int is_tracing_stopped(void);
363
364 extern int process_new_ksym_entry(char *ksymname, int op, unsigned long addr);
365
366 extern unsigned long nsecs_to_usecs(unsigned long nsecs);
367
368 extern unsigned long tracing_thresh;
369
370 #ifdef CONFIG_TRACER_MAX_TRACE
371 extern unsigned long tracing_max_latency;
372
373 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu);
374 void update_max_tr_single(struct trace_array *tr,
375                           struct task_struct *tsk, int cpu);
376 #endif /* CONFIG_TRACER_MAX_TRACE */
377
378 #ifdef CONFIG_STACKTRACE
379 void ftrace_trace_stack(struct ring_buffer *buffer, unsigned long flags,
380                         int skip, int pc);
381
382 void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags,
383                             int pc);
384
385 void __trace_stack(struct trace_array *tr, unsigned long flags, int skip,
386                    int pc);
387 #else
388 static inline void ftrace_trace_stack(struct ring_buffer *buffer,
389                                       unsigned long flags, int skip, int pc)
390 {
391 }
392
393 static inline void ftrace_trace_userstack(struct ring_buffer *buffer,
394                                           unsigned long flags, int pc)
395 {
396 }
397
398 static inline void __trace_stack(struct trace_array *tr, unsigned long flags,
399                                  int skip, int pc)
400 {
401 }
402 #endif /* CONFIG_STACKTRACE */
403
404 extern cycle_t ftrace_now(int cpu);
405
406 extern void trace_find_cmdline(int pid, char comm[]);
407
408 #ifdef CONFIG_DYNAMIC_FTRACE
409 extern unsigned long ftrace_update_tot_cnt;
410 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
411 extern int DYN_FTRACE_TEST_NAME(void);
412 #endif
413
414 extern int ring_buffer_expanded;
415 extern bool tracing_selftest_disabled;
416 DECLARE_PER_CPU(int, ftrace_cpu_disabled);
417
418 #ifdef CONFIG_FTRACE_STARTUP_TEST
419 extern int trace_selftest_startup_function(struct tracer *trace,
420                                            struct trace_array *tr);
421 extern int trace_selftest_startup_function_graph(struct tracer *trace,
422                                                  struct trace_array *tr);
423 extern int trace_selftest_startup_irqsoff(struct tracer *trace,
424                                           struct trace_array *tr);
425 extern int trace_selftest_startup_preemptoff(struct tracer *trace,
426                                              struct trace_array *tr);
427 extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace,
428                                                  struct trace_array *tr);
429 extern int trace_selftest_startup_wakeup(struct tracer *trace,
430                                          struct trace_array *tr);
431 extern int trace_selftest_startup_nop(struct tracer *trace,
432                                          struct trace_array *tr);
433 extern int trace_selftest_startup_sched_switch(struct tracer *trace,
434                                                struct trace_array *tr);
435 extern int trace_selftest_startup_sysprof(struct tracer *trace,
436                                                struct trace_array *tr);
437 extern int trace_selftest_startup_branch(struct tracer *trace,
438                                          struct trace_array *tr);
439 extern int trace_selftest_startup_ksym(struct tracer *trace,
440                                          struct trace_array *tr);
441 #endif /* CONFIG_FTRACE_STARTUP_TEST */
442
443 extern void *head_page(struct trace_array_cpu *data);
444 extern unsigned long long ns2usecs(cycle_t nsec);
445 extern int
446 trace_vbprintk(unsigned long ip, const char *fmt, va_list args);
447 extern int
448 trace_vprintk(unsigned long ip, const char *fmt, va_list args);
449 extern int
450 trace_array_vprintk(struct trace_array *tr,
451                     unsigned long ip, const char *fmt, va_list args);
452 int trace_array_printk(struct trace_array *tr,
453                        unsigned long ip, const char *fmt, ...);
454
455 extern unsigned long trace_flags;
456
457 extern int trace_clock_id;
458
459 /* Standard output formatting function used for function return traces */
460 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
461
462 /* Flag options */
463 #define TRACE_GRAPH_PRINT_OVERRUN       0x1
464 #define TRACE_GRAPH_PRINT_CPU           0x2
465 #define TRACE_GRAPH_PRINT_OVERHEAD      0x4
466 #define TRACE_GRAPH_PRINT_PROC          0x8
467 #define TRACE_GRAPH_PRINT_DURATION      0x10
468 #define TRACE_GRAPH_PRINT_ABS_TIME      0x20
469
470 extern enum print_line_t
471 print_graph_function_flags(struct trace_iterator *iter, u32 flags);
472 extern void print_graph_headers_flags(struct seq_file *s, u32 flags);
473 extern enum print_line_t
474 trace_print_graph_duration(unsigned long long duration, struct trace_seq *s);
475 extern void graph_trace_open(struct trace_iterator *iter);
476 extern void graph_trace_close(struct trace_iterator *iter);
477 extern int __trace_graph_entry(struct trace_array *tr,
478                                struct ftrace_graph_ent *trace,
479                                unsigned long flags, int pc);
480 extern void __trace_graph_return(struct trace_array *tr,
481                                  struct ftrace_graph_ret *trace,
482                                  unsigned long flags, int pc);
483
484
485 #ifdef CONFIG_DYNAMIC_FTRACE
486 /* TODO: make this variable */
487 #define FTRACE_GRAPH_MAX_FUNCS          32
488 extern int ftrace_graph_filter_enabled;
489 extern int ftrace_graph_count;
490 extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS];
491
492 static inline int ftrace_graph_addr(unsigned long addr)
493 {
494         int i;
495
496         if (!ftrace_graph_filter_enabled)
497                 return 1;
498
499         for (i = 0; i < ftrace_graph_count; i++) {
500                 if (addr == ftrace_graph_funcs[i])
501                         return 1;
502         }
503
504         return 0;
505 }
506 #else
507 static inline int ftrace_graph_addr(unsigned long addr)
508 {
509         return 1;
510 }
511 #endif /* CONFIG_DYNAMIC_FTRACE */
512 #else /* CONFIG_FUNCTION_GRAPH_TRACER */
513 static inline enum print_line_t
514 print_graph_function_flags(struct trace_iterator *iter, u32 flags)
515 {
516         return TRACE_TYPE_UNHANDLED;
517 }
518 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
519
520 extern struct list_head ftrace_pids;
521
522 #ifdef CONFIG_FUNCTION_TRACER
523 static inline int ftrace_trace_task(struct task_struct *task)
524 {
525         if (list_empty(&ftrace_pids))
526                 return 1;
527
528         return test_tsk_trace_trace(task);
529 }
530 #else
531 static inline int ftrace_trace_task(struct task_struct *task)
532 {
533         return 1;
534 }
535 #endif
536
537 /*
538  * struct trace_parser - servers for reading the user input separated by spaces
539  * @cont: set if the input is not complete - no final space char was found
540  * @buffer: holds the parsed user input
541  * @idx: user input length
542  * @size: buffer size
543  */
544 struct trace_parser {
545         bool            cont;
546         char            *buffer;
547         unsigned        idx;
548         unsigned        size;
549 };
550
551 static inline bool trace_parser_loaded(struct trace_parser *parser)
552 {
553         return (parser->idx != 0);
554 }
555
556 static inline bool trace_parser_cont(struct trace_parser *parser)
557 {
558         return parser->cont;
559 }
560
561 static inline void trace_parser_clear(struct trace_parser *parser)
562 {
563         parser->cont = false;
564         parser->idx = 0;
565 }
566
567 extern int trace_parser_get_init(struct trace_parser *parser, int size);
568 extern void trace_parser_put(struct trace_parser *parser);
569 extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
570         size_t cnt, loff_t *ppos);
571
572 /*
573  * trace_iterator_flags is an enumeration that defines bit
574  * positions into trace_flags that controls the output.
575  *
576  * NOTE: These bits must match the trace_options array in
577  *       trace.c.
578  */
579 enum trace_iterator_flags {
580         TRACE_ITER_PRINT_PARENT         = 0x01,
581         TRACE_ITER_SYM_OFFSET           = 0x02,
582         TRACE_ITER_SYM_ADDR             = 0x04,
583         TRACE_ITER_VERBOSE              = 0x08,
584         TRACE_ITER_RAW                  = 0x10,
585         TRACE_ITER_HEX                  = 0x20,
586         TRACE_ITER_BIN                  = 0x40,
587         TRACE_ITER_BLOCK                = 0x80,
588         TRACE_ITER_STACKTRACE           = 0x100,
589         TRACE_ITER_PRINTK               = 0x200,
590         TRACE_ITER_PREEMPTONLY          = 0x400,
591         TRACE_ITER_BRANCH               = 0x800,
592         TRACE_ITER_ANNOTATE             = 0x1000,
593         TRACE_ITER_USERSTACKTRACE       = 0x2000,
594         TRACE_ITER_SYM_USEROBJ          = 0x4000,
595         TRACE_ITER_PRINTK_MSGONLY       = 0x8000,
596         TRACE_ITER_CONTEXT_INFO         = 0x10000, /* Print pid/cpu/time */
597         TRACE_ITER_LATENCY_FMT          = 0x20000,
598         TRACE_ITER_SLEEP_TIME           = 0x40000,
599         TRACE_ITER_GRAPH_TIME           = 0x80000,
600 };
601
602 /*
603  * TRACE_ITER_SYM_MASK masks the options in trace_flags that
604  * control the output of kernel symbols.
605  */
606 #define TRACE_ITER_SYM_MASK \
607         (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR)
608
609 extern struct tracer nop_trace;
610
611 #ifdef CONFIG_BRANCH_TRACER
612 extern int enable_branch_tracing(struct trace_array *tr);
613 extern void disable_branch_tracing(void);
614 static inline int trace_branch_enable(struct trace_array *tr)
615 {
616         if (trace_flags & TRACE_ITER_BRANCH)
617                 return enable_branch_tracing(tr);
618         return 0;
619 }
620 static inline void trace_branch_disable(void)
621 {
622         /* due to races, always disable */
623         disable_branch_tracing();
624 }
625 #else
626 static inline int trace_branch_enable(struct trace_array *tr)
627 {
628         return 0;
629 }
630 static inline void trace_branch_disable(void)
631 {
632 }
633 #endif /* CONFIG_BRANCH_TRACER */
634
635 /* set ring buffers to default size if not already done so */
636 int tracing_update_buffers(void);
637
638 /* trace event type bit fields, not numeric */
639 enum {
640         TRACE_EVENT_TYPE_PRINTF         = 1,
641         TRACE_EVENT_TYPE_RAW            = 2,
642 };
643
644 struct ftrace_event_field {
645         struct list_head        link;
646         char                    *name;
647         char                    *type;
648         int                     filter_type;
649         int                     offset;
650         int                     size;
651         int                     is_signed;
652 };
653
654 struct event_filter {
655         int                     n_preds;
656         struct filter_pred      **preds;
657         char                    *filter_string;
658 };
659
660 struct event_subsystem {
661         struct list_head        list;
662         const char              *name;
663         struct dentry           *entry;
664         struct event_filter     *filter;
665         int                     nr_events;
666 };
667
668 struct filter_pred;
669 struct regex;
670
671 typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event,
672                                  int val1, int val2);
673
674 typedef int (*regex_match_func)(char *str, struct regex *r, int len);
675
676 enum regex_type {
677         MATCH_FULL = 0,
678         MATCH_FRONT_ONLY,
679         MATCH_MIDDLE_ONLY,
680         MATCH_END_ONLY,
681 };
682
683 struct regex {
684         char                    pattern[MAX_FILTER_STR_VAL];
685         int                     len;
686         int                     field_len;
687         regex_match_func        match;
688 };
689
690 struct filter_pred {
691         filter_pred_fn_t        fn;
692         u64                     val;
693         struct regex            regex;
694         char                    *field_name;
695         int                     offset;
696         int                     not;
697         int                     op;
698         int                     pop_n;
699 };
700
701 extern struct list_head ftrace_common_fields;
702
703 extern enum regex_type
704 filter_parse_regex(char *buff, int len, char **search, int *not);
705 extern void print_event_filter(struct ftrace_event_call *call,
706                                struct trace_seq *s);
707 extern int apply_event_filter(struct ftrace_event_call *call,
708                               char *filter_string);
709 extern int apply_subsystem_event_filter(struct event_subsystem *system,
710                                         char *filter_string);
711 extern void print_subsystem_event_filter(struct event_subsystem *system,
712                                          struct trace_seq *s);
713 extern int filter_assign_type(const char *type);
714
715 struct list_head *
716 trace_get_fields(struct ftrace_event_call *event_call);
717
718 static inline int
719 filter_check_discard(struct ftrace_event_call *call, void *rec,
720                      struct ring_buffer *buffer,
721                      struct ring_buffer_event *event)
722 {
723         if (unlikely(call->flags & TRACE_EVENT_FL_FILTERED) &&
724             !filter_match_preds(call->filter, rec)) {
725                 ring_buffer_discard_commit(buffer, event);
726                 return 1;
727         }
728
729         return 0;
730 }
731
732 extern struct mutex event_mutex;
733 extern struct list_head ftrace_events;
734
735 extern const char *__start___trace_bprintk_fmt[];
736 extern const char *__stop___trace_bprintk_fmt[];
737
738 #undef FTRACE_ENTRY
739 #define FTRACE_ENTRY(call, struct_name, id, tstruct, print)             \
740         extern struct ftrace_event_call                                 \
741         __attribute__((__aligned__(4))) event_##call;
742 #undef FTRACE_ENTRY_DUP
743 #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print)         \
744         FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print))
745 #include "trace_entries.h"
746
747 #endif /* _LINUX_KERNEL_TRACE_H */