perf: Fix double start/stop in x86_pmu_start()
[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 <linux/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         struct tracer_flags     *flags;
276         int                     print_max;
277         int                     use_max_tr;
278 };
279
280
281 /* Only current can touch trace_recursion */
282 #define trace_recursion_inc() do { (current)->trace_recursion++; } while (0)
283 #define trace_recursion_dec() do { (current)->trace_recursion--; } while (0)
284
285 /* Ring buffer has the 10 LSB bits to count */
286 #define trace_recursion_buffer() ((current)->trace_recursion & 0x3ff)
287
288 /* for function tracing recursion */
289 #define TRACE_INTERNAL_BIT              (1<<11)
290 #define TRACE_GLOBAL_BIT                (1<<12)
291 /*
292  * Abuse of the trace_recursion.
293  * As we need a way to maintain state if we are tracing the function
294  * graph in irq because we want to trace a particular function that
295  * was called in irq context but we have irq tracing off. Since this
296  * can only be modified by current, we can reuse trace_recursion.
297  */
298 #define TRACE_IRQ_BIT                   (1<<13)
299
300 #define trace_recursion_set(bit)        do { (current)->trace_recursion |= (bit); } while (0)
301 #define trace_recursion_clear(bit)      do { (current)->trace_recursion &= ~(bit); } while (0)
302 #define trace_recursion_test(bit)       ((current)->trace_recursion & (bit))
303
304 #define TRACE_PIPE_ALL_CPU      -1
305
306 int tracer_init(struct tracer *t, struct trace_array *tr);
307 int tracing_is_enabled(void);
308 void trace_wake_up(void);
309 void tracing_reset(struct trace_array *tr, int cpu);
310 void tracing_reset_online_cpus(struct trace_array *tr);
311 void tracing_reset_current(int cpu);
312 void tracing_reset_current_online_cpus(void);
313 int tracing_open_generic(struct inode *inode, struct file *filp);
314 struct dentry *trace_create_file(const char *name,
315                                  umode_t mode,
316                                  struct dentry *parent,
317                                  void *data,
318                                  const struct file_operations *fops);
319
320 struct dentry *tracing_init_dentry(void);
321
322 struct ring_buffer_event;
323
324 struct ring_buffer_event *
325 trace_buffer_lock_reserve(struct ring_buffer *buffer,
326                           int type,
327                           unsigned long len,
328                           unsigned long flags,
329                           int pc);
330 void trace_buffer_unlock_commit(struct ring_buffer *buffer,
331                                 struct ring_buffer_event *event,
332                                 unsigned long flags, int pc);
333
334 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,
335                                                 struct trace_array_cpu *data);
336
337 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter,
338                                           int *ent_cpu, u64 *ent_ts);
339
340 int trace_empty(struct trace_iterator *iter);
341
342 void *trace_find_next_entry_inc(struct trace_iterator *iter);
343
344 void trace_init_global_iter(struct trace_iterator *iter);
345
346 void tracing_iter_reset(struct trace_iterator *iter, int cpu);
347
348 void default_wait_pipe(struct trace_iterator *iter);
349 void poll_wait_pipe(struct trace_iterator *iter);
350
351 void ftrace(struct trace_array *tr,
352                             struct trace_array_cpu *data,
353                             unsigned long ip,
354                             unsigned long parent_ip,
355                             unsigned long flags, int pc);
356 void tracing_sched_switch_trace(struct trace_array *tr,
357                                 struct task_struct *prev,
358                                 struct task_struct *next,
359                                 unsigned long flags, int pc);
360
361 void tracing_sched_wakeup_trace(struct trace_array *tr,
362                                 struct task_struct *wakee,
363                                 struct task_struct *cur,
364                                 unsigned long flags, int pc);
365 void trace_function(struct trace_array *tr,
366                     unsigned long ip,
367                     unsigned long parent_ip,
368                     unsigned long flags, int pc);
369 void trace_graph_function(struct trace_array *tr,
370                     unsigned long ip,
371                     unsigned long parent_ip,
372                     unsigned long flags, int pc);
373 void trace_latency_header(struct seq_file *m);
374 void trace_default_header(struct seq_file *m);
375 void print_trace_header(struct seq_file *m, struct trace_iterator *iter);
376 int trace_empty(struct trace_iterator *iter);
377
378 void trace_graph_return(struct ftrace_graph_ret *trace);
379 int trace_graph_entry(struct ftrace_graph_ent *trace);
380 void set_graph_array(struct trace_array *tr);
381
382 void tracing_start_cmdline_record(void);
383 void tracing_stop_cmdline_record(void);
384 void tracing_sched_switch_assign_trace(struct trace_array *tr);
385 void tracing_stop_sched_switch_record(void);
386 void tracing_start_sched_switch_record(void);
387 int register_tracer(struct tracer *type);
388 void unregister_tracer(struct tracer *type);
389 int is_tracing_stopped(void);
390 enum trace_file_type {
391         TRACE_FILE_LAT_FMT      = 1,
392         TRACE_FILE_ANNOTATE     = 2,
393 };
394
395 extern cpumask_var_t __read_mostly tracing_buffer_mask;
396
397 #define for_each_tracing_cpu(cpu)       \
398         for_each_cpu(cpu, tracing_buffer_mask)
399
400 extern unsigned long nsecs_to_usecs(unsigned long nsecs);
401
402 extern unsigned long tracing_thresh;
403
404 #ifdef CONFIG_TRACER_MAX_TRACE
405 extern unsigned long tracing_max_latency;
406
407 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu);
408 void update_max_tr_single(struct trace_array *tr,
409                           struct task_struct *tsk, int cpu);
410 #endif /* CONFIG_TRACER_MAX_TRACE */
411
412 #ifdef CONFIG_STACKTRACE
413 void ftrace_trace_stack(struct ring_buffer *buffer, unsigned long flags,
414                         int skip, int pc);
415
416 void ftrace_trace_stack_regs(struct ring_buffer *buffer, unsigned long flags,
417                              int skip, int pc, struct pt_regs *regs);
418
419 void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags,
420                             int pc);
421
422 void __trace_stack(struct trace_array *tr, unsigned long flags, int skip,
423                    int pc);
424 #else
425 static inline void ftrace_trace_stack(struct ring_buffer *buffer,
426                                       unsigned long flags, int skip, int pc)
427 {
428 }
429
430 static inline void ftrace_trace_stack_regs(struct ring_buffer *buffer,
431                                            unsigned long flags, int skip,
432                                            int pc, struct pt_regs *regs)
433 {
434 }
435
436 static inline void ftrace_trace_userstack(struct ring_buffer *buffer,
437                                           unsigned long flags, int pc)
438 {
439 }
440
441 static inline void __trace_stack(struct trace_array *tr, unsigned long flags,
442                                  int skip, int pc)
443 {
444 }
445 #endif /* CONFIG_STACKTRACE */
446
447 extern cycle_t ftrace_now(int cpu);
448
449 extern void trace_find_cmdline(int pid, char comm[]);
450
451 #ifdef CONFIG_DYNAMIC_FTRACE
452 extern unsigned long ftrace_update_tot_cnt;
453 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
454 extern int DYN_FTRACE_TEST_NAME(void);
455 #define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2
456 extern int DYN_FTRACE_TEST_NAME2(void);
457 #endif
458
459 extern int ring_buffer_expanded;
460 extern bool tracing_selftest_disabled;
461 DECLARE_PER_CPU(int, ftrace_cpu_disabled);
462
463 #ifdef CONFIG_FTRACE_STARTUP_TEST
464 extern int trace_selftest_startup_function(struct tracer *trace,
465                                            struct trace_array *tr);
466 extern int trace_selftest_startup_function_graph(struct tracer *trace,
467                                                  struct trace_array *tr);
468 extern int trace_selftest_startup_irqsoff(struct tracer *trace,
469                                           struct trace_array *tr);
470 extern int trace_selftest_startup_preemptoff(struct tracer *trace,
471                                              struct trace_array *tr);
472 extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace,
473                                                  struct trace_array *tr);
474 extern int trace_selftest_startup_wakeup(struct tracer *trace,
475                                          struct trace_array *tr);
476 extern int trace_selftest_startup_nop(struct tracer *trace,
477                                          struct trace_array *tr);
478 extern int trace_selftest_startup_sched_switch(struct tracer *trace,
479                                                struct trace_array *tr);
480 extern int trace_selftest_startup_branch(struct tracer *trace,
481                                          struct trace_array *tr);
482 #endif /* CONFIG_FTRACE_STARTUP_TEST */
483
484 extern void *head_page(struct trace_array_cpu *data);
485 extern unsigned long long ns2usecs(cycle_t nsec);
486 extern int
487 trace_vbprintk(unsigned long ip, const char *fmt, va_list args);
488 extern int
489 trace_vprintk(unsigned long ip, const char *fmt, va_list args);
490 extern int
491 trace_array_vprintk(struct trace_array *tr,
492                     unsigned long ip, const char *fmt, va_list args);
493 int trace_array_printk(struct trace_array *tr,
494                        unsigned long ip, const char *fmt, ...);
495 void trace_printk_seq(struct trace_seq *s);
496 enum print_line_t print_trace_line(struct trace_iterator *iter);
497
498 extern unsigned long trace_flags;
499
500 extern int trace_clock_id;
501
502 /* Standard output formatting function used for function return traces */
503 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
504
505 /* Flag options */
506 #define TRACE_GRAPH_PRINT_OVERRUN       0x1
507 #define TRACE_GRAPH_PRINT_CPU           0x2
508 #define TRACE_GRAPH_PRINT_OVERHEAD      0x4
509 #define TRACE_GRAPH_PRINT_PROC          0x8
510 #define TRACE_GRAPH_PRINT_DURATION      0x10
511 #define TRACE_GRAPH_PRINT_ABS_TIME      0x20
512
513 extern enum print_line_t
514 print_graph_function_flags(struct trace_iterator *iter, u32 flags);
515 extern void print_graph_headers_flags(struct seq_file *s, u32 flags);
516 extern enum print_line_t
517 trace_print_graph_duration(unsigned long long duration, struct trace_seq *s);
518 extern void graph_trace_open(struct trace_iterator *iter);
519 extern void graph_trace_close(struct trace_iterator *iter);
520 extern int __trace_graph_entry(struct trace_array *tr,
521                                struct ftrace_graph_ent *trace,
522                                unsigned long flags, int pc);
523 extern void __trace_graph_return(struct trace_array *tr,
524                                  struct ftrace_graph_ret *trace,
525                                  unsigned long flags, int pc);
526
527
528 #ifdef CONFIG_DYNAMIC_FTRACE
529 /* TODO: make this variable */
530 #define FTRACE_GRAPH_MAX_FUNCS          32
531 extern int ftrace_graph_filter_enabled;
532 extern int ftrace_graph_count;
533 extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS];
534
535 static inline int ftrace_graph_addr(unsigned long addr)
536 {
537         int i;
538
539         if (!ftrace_graph_filter_enabled)
540                 return 1;
541
542         for (i = 0; i < ftrace_graph_count; i++) {
543                 if (addr == ftrace_graph_funcs[i]) {
544                         /*
545                          * If no irqs are to be traced, but a set_graph_function
546                          * is set, and called by an interrupt handler, we still
547                          * want to trace it.
548                          */
549                         if (in_irq())
550                                 trace_recursion_set(TRACE_IRQ_BIT);
551                         else
552                                 trace_recursion_clear(TRACE_IRQ_BIT);
553                         return 1;
554                 }
555         }
556
557         return 0;
558 }
559 #else
560 static inline int ftrace_graph_addr(unsigned long addr)
561 {
562         return 1;
563 }
564 #endif /* CONFIG_DYNAMIC_FTRACE */
565 #else /* CONFIG_FUNCTION_GRAPH_TRACER */
566 static inline enum print_line_t
567 print_graph_function_flags(struct trace_iterator *iter, u32 flags)
568 {
569         return TRACE_TYPE_UNHANDLED;
570 }
571 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
572
573 extern struct list_head ftrace_pids;
574
575 #ifdef CONFIG_FUNCTION_TRACER
576 static inline int ftrace_trace_task(struct task_struct *task)
577 {
578         if (list_empty(&ftrace_pids))
579                 return 1;
580
581         return test_tsk_trace_trace(task);
582 }
583 extern int ftrace_is_dead(void);
584 #else
585 static inline int ftrace_trace_task(struct task_struct *task)
586 {
587         return 1;
588 }
589 static inline int ftrace_is_dead(void) { return 0; }
590 #endif
591
592 /*
593  * struct trace_parser - servers for reading the user input separated by spaces
594  * @cont: set if the input is not complete - no final space char was found
595  * @buffer: holds the parsed user input
596  * @idx: user input length
597  * @size: buffer size
598  */
599 struct trace_parser {
600         bool            cont;
601         char            *buffer;
602         unsigned        idx;
603         unsigned        size;
604 };
605
606 static inline bool trace_parser_loaded(struct trace_parser *parser)
607 {
608         return (parser->idx != 0);
609 }
610
611 static inline bool trace_parser_cont(struct trace_parser *parser)
612 {
613         return parser->cont;
614 }
615
616 static inline void trace_parser_clear(struct trace_parser *parser)
617 {
618         parser->cont = false;
619         parser->idx = 0;
620 }
621
622 extern int trace_parser_get_init(struct trace_parser *parser, int size);
623 extern void trace_parser_put(struct trace_parser *parser);
624 extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
625         size_t cnt, loff_t *ppos);
626
627 /*
628  * trace_iterator_flags is an enumeration that defines bit
629  * positions into trace_flags that controls the output.
630  *
631  * NOTE: These bits must match the trace_options array in
632  *       trace.c.
633  */
634 enum trace_iterator_flags {
635         TRACE_ITER_PRINT_PARENT         = 0x01,
636         TRACE_ITER_SYM_OFFSET           = 0x02,
637         TRACE_ITER_SYM_ADDR             = 0x04,
638         TRACE_ITER_VERBOSE              = 0x08,
639         TRACE_ITER_RAW                  = 0x10,
640         TRACE_ITER_HEX                  = 0x20,
641         TRACE_ITER_BIN                  = 0x40,
642         TRACE_ITER_BLOCK                = 0x80,
643         TRACE_ITER_STACKTRACE           = 0x100,
644         TRACE_ITER_PRINTK               = 0x200,
645         TRACE_ITER_PREEMPTONLY          = 0x400,
646         TRACE_ITER_BRANCH               = 0x800,
647         TRACE_ITER_ANNOTATE             = 0x1000,
648         TRACE_ITER_USERSTACKTRACE       = 0x2000,
649         TRACE_ITER_SYM_USEROBJ          = 0x4000,
650         TRACE_ITER_PRINTK_MSGONLY       = 0x8000,
651         TRACE_ITER_CONTEXT_INFO         = 0x10000, /* Print pid/cpu/time */
652         TRACE_ITER_LATENCY_FMT          = 0x20000,
653         TRACE_ITER_SLEEP_TIME           = 0x40000,
654         TRACE_ITER_GRAPH_TIME           = 0x80000,
655         TRACE_ITER_RECORD_CMD           = 0x100000,
656         TRACE_ITER_OVERWRITE            = 0x200000,
657         TRACE_ITER_STOP_ON_FREE         = 0x400000,
658         TRACE_ITER_IRQ_INFO             = 0x800000,
659 };
660
661 /*
662  * TRACE_ITER_SYM_MASK masks the options in trace_flags that
663  * control the output of kernel symbols.
664  */
665 #define TRACE_ITER_SYM_MASK \
666         (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR)
667
668 extern struct tracer nop_trace;
669
670 #ifdef CONFIG_BRANCH_TRACER
671 extern int enable_branch_tracing(struct trace_array *tr);
672 extern void disable_branch_tracing(void);
673 static inline int trace_branch_enable(struct trace_array *tr)
674 {
675         if (trace_flags & TRACE_ITER_BRANCH)
676                 return enable_branch_tracing(tr);
677         return 0;
678 }
679 static inline void trace_branch_disable(void)
680 {
681         /* due to races, always disable */
682         disable_branch_tracing();
683 }
684 #else
685 static inline int trace_branch_enable(struct trace_array *tr)
686 {
687         return 0;
688 }
689 static inline void trace_branch_disable(void)
690 {
691 }
692 #endif /* CONFIG_BRANCH_TRACER */
693
694 /* set ring buffers to default size if not already done so */
695 int tracing_update_buffers(void);
696
697 /* trace event type bit fields, not numeric */
698 enum {
699         TRACE_EVENT_TYPE_PRINTF         = 1,
700         TRACE_EVENT_TYPE_RAW            = 2,
701 };
702
703 struct ftrace_event_field {
704         struct list_head        link;
705         char                    *name;
706         char                    *type;
707         int                     filter_type;
708         int                     offset;
709         int                     size;
710         int                     is_signed;
711 };
712
713 struct event_filter {
714         int                     n_preds;        /* Number assigned */
715         int                     a_preds;        /* allocated */
716         struct filter_pred      *preds;
717         struct filter_pred      *root;
718         char                    *filter_string;
719 };
720
721 struct event_subsystem {
722         struct list_head        list;
723         const char              *name;
724         struct dentry           *entry;
725         struct event_filter     *filter;
726         int                     nr_events;
727         int                     ref_count;
728 };
729
730 #define FILTER_PRED_INVALID     ((unsigned short)-1)
731 #define FILTER_PRED_IS_RIGHT    (1 << 15)
732 #define FILTER_PRED_FOLD        (1 << 15)
733
734 /*
735  * The max preds is the size of unsigned short with
736  * two flags at the MSBs. One bit is used for both the IS_RIGHT
737  * and FOLD flags. The other is reserved.
738  *
739  * 2^14 preds is way more than enough.
740  */
741 #define MAX_FILTER_PRED         16384
742
743 struct filter_pred;
744 struct regex;
745
746 typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event);
747
748 typedef int (*regex_match_func)(char *str, struct regex *r, int len);
749
750 enum regex_type {
751         MATCH_FULL = 0,
752         MATCH_FRONT_ONLY,
753         MATCH_MIDDLE_ONLY,
754         MATCH_END_ONLY,
755 };
756
757 struct regex {
758         char                    pattern[MAX_FILTER_STR_VAL];
759         int                     len;
760         int                     field_len;
761         regex_match_func        match;
762 };
763
764 struct filter_pred {
765         filter_pred_fn_t        fn;
766         u64                     val;
767         struct regex            regex;
768         unsigned short          *ops;
769 #ifdef CONFIG_FTRACE_STARTUP_TEST
770         struct ftrace_event_field *field;
771 #endif
772         int                     offset;
773         int                     not;
774         int                     op;
775         unsigned short          index;
776         unsigned short          parent;
777         unsigned short          left;
778         unsigned short          right;
779 };
780
781 extern struct list_head ftrace_common_fields;
782
783 extern enum regex_type
784 filter_parse_regex(char *buff, int len, char **search, int *not);
785 extern void print_event_filter(struct ftrace_event_call *call,
786                                struct trace_seq *s);
787 extern int apply_event_filter(struct ftrace_event_call *call,
788                               char *filter_string);
789 extern int apply_subsystem_event_filter(struct event_subsystem *system,
790                                         char *filter_string);
791 extern void print_subsystem_event_filter(struct event_subsystem *system,
792                                          struct trace_seq *s);
793 extern int filter_assign_type(const char *type);
794
795 struct list_head *
796 trace_get_fields(struct ftrace_event_call *event_call);
797
798 static inline int
799 filter_check_discard(struct ftrace_event_call *call, void *rec,
800                      struct ring_buffer *buffer,
801                      struct ring_buffer_event *event)
802 {
803         if (unlikely(call->flags & TRACE_EVENT_FL_FILTERED) &&
804             !filter_match_preds(call->filter, rec)) {
805                 ring_buffer_discard_commit(buffer, event);
806                 return 1;
807         }
808
809         return 0;
810 }
811
812 extern void trace_event_enable_cmd_record(bool enable);
813
814 extern struct mutex event_mutex;
815 extern struct list_head ftrace_events;
816
817 extern const char *__start___trace_bprintk_fmt[];
818 extern const char *__stop___trace_bprintk_fmt[];
819
820 #undef FTRACE_ENTRY
821 #define FTRACE_ENTRY(call, struct_name, id, tstruct, print)             \
822         extern struct ftrace_event_call                                 \
823         __attribute__((__aligned__(4))) event_##call;
824 #undef FTRACE_ENTRY_DUP
825 #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print)         \
826         FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print))
827 #include "trace_entries.h"
828
829 #endif /* _LINUX_KERNEL_TRACE_H */