tracing: Move fields from event to class structure
[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 <trace/boot.h>
13 #include <linux/kmemtrace.h>
14 #include <linux/hw_breakpoint.h>
15
16 #include <linux/trace_seq.h>
17 #include <linux/ftrace_event.h>
18
19 enum trace_type {
20         __TRACE_FIRST_TYPE = 0,
21
22         TRACE_FN,
23         TRACE_CTX,
24         TRACE_WAKE,
25         TRACE_STACK,
26         TRACE_PRINT,
27         TRACE_BPRINT,
28         TRACE_SPECIAL,
29         TRACE_MMIO_RW,
30         TRACE_MMIO_MAP,
31         TRACE_BRANCH,
32         TRACE_BOOT_CALL,
33         TRACE_BOOT_RET,
34         TRACE_GRAPH_RET,
35         TRACE_GRAPH_ENT,
36         TRACE_USER_STACK,
37         TRACE_HW_BRANCHES,
38         TRACE_KMEM_ALLOC,
39         TRACE_KMEM_FREE,
40         TRACE_BLK,
41         TRACE_KSYM,
42
43         __TRACE_LAST_TYPE,
44 };
45
46 enum kmemtrace_type_id {
47         KMEMTRACE_TYPE_KMALLOC = 0,     /* kmalloc() or kfree(). */
48         KMEMTRACE_TYPE_CACHE,           /* kmem_cache_*(). */
49         KMEMTRACE_TYPE_PAGES,           /* __get_free_pages() and friends. */
50 };
51
52 extern struct tracer boot_tracer;
53
54 #undef __field
55 #define __field(type, item)             type    item;
56
57 #undef __field_struct
58 #define __field_struct(type, item)      __field(type, item)
59
60 #undef __field_desc
61 #define __field_desc(type, container, item)
62
63 #undef __array
64 #define __array(type, item, size)       type    item[size];
65
66 #undef __array_desc
67 #define __array_desc(type, container, item, size)
68
69 #undef __dynamic_array
70 #define __dynamic_array(type, item)     type    item[];
71
72 #undef F_STRUCT
73 #define F_STRUCT(args...)               args
74
75 #undef FTRACE_ENTRY
76 #define FTRACE_ENTRY(name, struct_name, id, tstruct, print)     \
77         struct struct_name {                                    \
78                 struct trace_entry      ent;                    \
79                 tstruct                                         \
80         }
81
82 #undef TP_ARGS
83 #define TP_ARGS(args...)        args
84
85 #undef FTRACE_ENTRY_DUP
86 #define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk)
87
88 #include "trace_entries.h"
89
90 /*
91  * syscalls are special, and need special handling, this is why
92  * they are not included in trace_entries.h
93  */
94 struct syscall_trace_enter {
95         struct trace_entry      ent;
96         int                     nr;
97         unsigned long           args[];
98 };
99
100 struct syscall_trace_exit {
101         struct trace_entry      ent;
102         int                     nr;
103         long                    ret;
104 };
105
106 struct kprobe_trace_entry {
107         struct trace_entry      ent;
108         unsigned long           ip;
109         int                     nargs;
110         unsigned long           args[];
111 };
112
113 #define SIZEOF_KPROBE_TRACE_ENTRY(n)                    \
114         (offsetof(struct kprobe_trace_entry, args) +    \
115         (sizeof(unsigned long) * (n)))
116
117 struct kretprobe_trace_entry {
118         struct trace_entry      ent;
119         unsigned long           func;
120         unsigned long           ret_ip;
121         int                     nargs;
122         unsigned long           args[];
123 };
124
125 #define SIZEOF_KRETPROBE_TRACE_ENTRY(n)                 \
126         (offsetof(struct kretprobe_trace_entry, args) + \
127         (sizeof(unsigned long) * (n)))
128
129 /*
130  * trace_flag_type is an enumeration that holds different
131  * states when a trace occurs. These are:
132  *  IRQS_OFF            - interrupts were disabled
133  *  IRQS_NOSUPPORT      - arch does not support irqs_disabled_flags
134  *  NEED_RESCHED        - reschedule is requested
135  *  HARDIRQ             - inside an interrupt handler
136  *  SOFTIRQ             - inside a softirq handler
137  */
138 enum trace_flag_type {
139         TRACE_FLAG_IRQS_OFF             = 0x01,
140         TRACE_FLAG_IRQS_NOSUPPORT       = 0x02,
141         TRACE_FLAG_NEED_RESCHED         = 0x04,
142         TRACE_FLAG_HARDIRQ              = 0x08,
143         TRACE_FLAG_SOFTIRQ              = 0x10,
144 };
145
146 #define TRACE_BUF_SIZE          1024
147
148 /*
149  * The CPU trace array - it consists of thousands of trace entries
150  * plus some other descriptor data: (for example which task started
151  * the trace, etc.)
152  */
153 struct trace_array_cpu {
154         atomic_t                disabled;
155         void                    *buffer_page;   /* ring buffer spare */
156
157         unsigned long           saved_latency;
158         unsigned long           critical_start;
159         unsigned long           critical_end;
160         unsigned long           critical_sequence;
161         unsigned long           nice;
162         unsigned long           policy;
163         unsigned long           rt_priority;
164         unsigned long           skipped_entries;
165         cycle_t                 preempt_timestamp;
166         pid_t                   pid;
167         uid_t                   uid;
168         char                    comm[TASK_COMM_LEN];
169 };
170
171 /*
172  * The trace array - an array of per-CPU trace arrays. This is the
173  * highest level data structure that individual tracers deal with.
174  * They have on/off state as well:
175  */
176 struct trace_array {
177         struct ring_buffer      *buffer;
178         unsigned long           entries;
179         int                     cpu;
180         cycle_t                 time_start;
181         struct task_struct      *waiter;
182         struct trace_array_cpu  *data[NR_CPUS];
183 };
184
185 #define FTRACE_CMP_TYPE(var, type) \
186         __builtin_types_compatible_p(typeof(var), type *)
187
188 #undef IF_ASSIGN
189 #define IF_ASSIGN(var, entry, etype, id)                \
190         if (FTRACE_CMP_TYPE(var, etype)) {              \
191                 var = (typeof(var))(entry);             \
192                 WARN_ON(id && (entry)->type != id);     \
193                 break;                                  \
194         }
195
196 /* Will cause compile errors if type is not found. */
197 extern void __ftrace_bad_type(void);
198
199 /*
200  * The trace_assign_type is a verifier that the entry type is
201  * the same as the type being assigned. To add new types simply
202  * add a line with the following format:
203  *
204  * IF_ASSIGN(var, ent, type, id);
205  *
206  *  Where "type" is the trace type that includes the trace_entry
207  *  as the "ent" item. And "id" is the trace identifier that is
208  *  used in the trace_type enum.
209  *
210  *  If the type can have more than one id, then use zero.
211  */
212 #define trace_assign_type(var, ent)                                     \
213         do {                                                            \
214                 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN);     \
215                 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0);        \
216                 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK);   \
217                 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\
218                 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT);   \
219                 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \
220                 IF_ASSIGN(var, ent, struct special_entry, 0);           \
221                 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw,          \
222                           TRACE_MMIO_RW);                               \
223                 IF_ASSIGN(var, ent, struct trace_mmiotrace_map,         \
224                           TRACE_MMIO_MAP);                              \
225                 IF_ASSIGN(var, ent, struct trace_boot_call, TRACE_BOOT_CALL);\
226                 IF_ASSIGN(var, ent, struct trace_boot_ret, TRACE_BOOT_RET);\
227                 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \
228                 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry,      \
229                           TRACE_GRAPH_ENT);             \
230                 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry,      \
231                           TRACE_GRAPH_RET);             \
232                 IF_ASSIGN(var, ent, struct hw_branch_entry, TRACE_HW_BRANCHES);\
233                 IF_ASSIGN(var, ent, struct kmemtrace_alloc_entry,       \
234                           TRACE_KMEM_ALLOC);    \
235                 IF_ASSIGN(var, ent, struct kmemtrace_free_entry,        \
236                           TRACE_KMEM_FREE);     \
237                 IF_ASSIGN(var, ent, struct ksym_trace_entry, TRACE_KSYM);\
238                 __ftrace_bad_type();                                    \
239         } while (0)
240
241 /*
242  * An option specific to a tracer. This is a boolean value.
243  * The bit is the bit index that sets its value on the
244  * flags value in struct tracer_flags.
245  */
246 struct tracer_opt {
247         const char      *name; /* Will appear on the trace_options file */
248         u32             bit; /* Mask assigned in val field in tracer_flags */
249 };
250
251 /*
252  * The set of specific options for a tracer. Your tracer
253  * have to set the initial value of the flags val.
254  */
255 struct tracer_flags {
256         u32                     val;
257         struct tracer_opt       *opts;
258 };
259
260 /* Makes more easy to define a tracer opt */
261 #define TRACER_OPT(s, b)        .name = #s, .bit = b
262
263
264 /**
265  * struct tracer - a specific tracer and its callbacks to interact with debugfs
266  * @name: the name chosen to select it on the available_tracers file
267  * @init: called when one switches to this tracer (echo name > current_tracer)
268  * @reset: called when one switches to another tracer
269  * @start: called when tracing is unpaused (echo 1 > tracing_enabled)
270  * @stop: called when tracing is paused (echo 0 > tracing_enabled)
271  * @open: called when the trace file is opened
272  * @pipe_open: called when the trace_pipe file is opened
273  * @wait_pipe: override how the user waits for traces on trace_pipe
274  * @close: called when the trace file is released
275  * @pipe_close: called when the trace_pipe file is released
276  * @read: override the default read callback on trace_pipe
277  * @splice_read: override the default splice_read callback on trace_pipe
278  * @selftest: selftest to run on boot (see trace_selftest.c)
279  * @print_headers: override the first lines that describe your columns
280  * @print_line: callback that prints a trace
281  * @set_flag: signals one of your private flags changed (trace_options file)
282  * @flags: your private flags
283  */
284 struct tracer {
285         const char              *name;
286         int                     (*init)(struct trace_array *tr);
287         void                    (*reset)(struct trace_array *tr);
288         void                    (*start)(struct trace_array *tr);
289         void                    (*stop)(struct trace_array *tr);
290         void                    (*open)(struct trace_iterator *iter);
291         void                    (*pipe_open)(struct trace_iterator *iter);
292         void                    (*wait_pipe)(struct trace_iterator *iter);
293         void                    (*close)(struct trace_iterator *iter);
294         void                    (*pipe_close)(struct trace_iterator *iter);
295         ssize_t                 (*read)(struct trace_iterator *iter,
296                                         struct file *filp, char __user *ubuf,
297                                         size_t cnt, loff_t *ppos);
298         ssize_t                 (*splice_read)(struct trace_iterator *iter,
299                                                struct file *filp,
300                                                loff_t *ppos,
301                                                struct pipe_inode_info *pipe,
302                                                size_t len,
303                                                unsigned int flags);
304 #ifdef CONFIG_FTRACE_STARTUP_TEST
305         int                     (*selftest)(struct tracer *trace,
306                                             struct trace_array *tr);
307 #endif
308         void                    (*print_header)(struct seq_file *m);
309         enum print_line_t       (*print_line)(struct trace_iterator *iter);
310         /* If you handled the flag setting, return 0 */
311         int                     (*set_flag)(u32 old_flags, u32 bit, int set);
312         struct tracer           *next;
313         int                     print_max;
314         struct tracer_flags     *flags;
315 };
316
317
318 #define TRACE_PIPE_ALL_CPU      -1
319
320 int tracer_init(struct tracer *t, struct trace_array *tr);
321 int tracing_is_enabled(void);
322 void trace_wake_up(void);
323 void tracing_reset(struct trace_array *tr, int cpu);
324 void tracing_reset_online_cpus(struct trace_array *tr);
325 void tracing_reset_current(int cpu);
326 void tracing_reset_current_online_cpus(void);
327 int tracing_open_generic(struct inode *inode, struct file *filp);
328 struct dentry *trace_create_file(const char *name,
329                                  mode_t mode,
330                                  struct dentry *parent,
331                                  void *data,
332                                  const struct file_operations *fops);
333
334 struct dentry *tracing_init_dentry(void);
335 void init_tracer_sysprof_debugfs(struct dentry *d_tracer);
336
337 struct ring_buffer_event;
338
339 struct ring_buffer_event *
340 trace_buffer_lock_reserve(struct ring_buffer *buffer,
341                           int type,
342                           unsigned long len,
343                           unsigned long flags,
344                           int pc);
345 void trace_buffer_unlock_commit(struct ring_buffer *buffer,
346                                 struct ring_buffer_event *event,
347                                 unsigned long flags, int pc);
348
349 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,
350                                                 struct trace_array_cpu *data);
351
352 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter,
353                                           int *ent_cpu, u64 *ent_ts);
354
355 void default_wait_pipe(struct trace_iterator *iter);
356 void poll_wait_pipe(struct trace_iterator *iter);
357
358 void ftrace(struct trace_array *tr,
359                             struct trace_array_cpu *data,
360                             unsigned long ip,
361                             unsigned long parent_ip,
362                             unsigned long flags, int pc);
363 void tracing_sched_switch_trace(struct trace_array *tr,
364                                 struct task_struct *prev,
365                                 struct task_struct *next,
366                                 unsigned long flags, int pc);
367
368 void tracing_sched_wakeup_trace(struct trace_array *tr,
369                                 struct task_struct *wakee,
370                                 struct task_struct *cur,
371                                 unsigned long flags, int pc);
372 void trace_special(struct trace_array *tr,
373                    struct trace_array_cpu *data,
374                    unsigned long arg1,
375                    unsigned long arg2,
376                    unsigned long arg3, int pc);
377 void trace_function(struct trace_array *tr,
378                     unsigned long ip,
379                     unsigned long parent_ip,
380                     unsigned long flags, int pc);
381 void trace_default_header(struct seq_file *m);
382 void print_trace_header(struct seq_file *m, struct trace_iterator *iter);
383 int trace_empty(struct trace_iterator *iter);
384
385 void trace_graph_return(struct ftrace_graph_ret *trace);
386 int trace_graph_entry(struct ftrace_graph_ent *trace);
387 void set_graph_array(struct trace_array *tr);
388
389 void tracing_start_cmdline_record(void);
390 void tracing_stop_cmdline_record(void);
391 void tracing_sched_switch_assign_trace(struct trace_array *tr);
392 void tracing_stop_sched_switch_record(void);
393 void tracing_start_sched_switch_record(void);
394 int register_tracer(struct tracer *type);
395 void unregister_tracer(struct tracer *type);
396 int is_tracing_stopped(void);
397
398 extern int process_new_ksym_entry(char *ksymname, int op, unsigned long addr);
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_userstack(struct ring_buffer *buffer, unsigned long flags,
417                             int pc);
418
419 void __trace_stack(struct trace_array *tr, unsigned long flags, int skip,
420                    int pc);
421 #else
422 static inline void ftrace_trace_stack(struct trace_array *tr,
423                                       unsigned long flags, int skip, int pc)
424 {
425 }
426
427 static inline void ftrace_trace_userstack(struct trace_array *tr,
428                                           unsigned long flags, int pc)
429 {
430 }
431
432 static inline void __trace_stack(struct trace_array *tr, unsigned long flags,
433                                  int skip, int pc)
434 {
435 }
436 #endif /* CONFIG_STACKTRACE */
437
438 extern cycle_t ftrace_now(int cpu);
439
440 extern void trace_find_cmdline(int pid, char comm[]);
441
442 #ifdef CONFIG_DYNAMIC_FTRACE
443 extern unsigned long ftrace_update_tot_cnt;
444 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
445 extern int DYN_FTRACE_TEST_NAME(void);
446 #endif
447
448 extern int ring_buffer_expanded;
449 extern bool tracing_selftest_disabled;
450 DECLARE_PER_CPU(int, ftrace_cpu_disabled);
451
452 #ifdef CONFIG_FTRACE_STARTUP_TEST
453 extern int trace_selftest_startup_function(struct tracer *trace,
454                                            struct trace_array *tr);
455 extern int trace_selftest_startup_function_graph(struct tracer *trace,
456                                                  struct trace_array *tr);
457 extern int trace_selftest_startup_irqsoff(struct tracer *trace,
458                                           struct trace_array *tr);
459 extern int trace_selftest_startup_preemptoff(struct tracer *trace,
460                                              struct trace_array *tr);
461 extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace,
462                                                  struct trace_array *tr);
463 extern int trace_selftest_startup_wakeup(struct tracer *trace,
464                                          struct trace_array *tr);
465 extern int trace_selftest_startup_nop(struct tracer *trace,
466                                          struct trace_array *tr);
467 extern int trace_selftest_startup_sched_switch(struct tracer *trace,
468                                                struct trace_array *tr);
469 extern int trace_selftest_startup_sysprof(struct tracer *trace,
470                                                struct trace_array *tr);
471 extern int trace_selftest_startup_branch(struct tracer *trace,
472                                          struct trace_array *tr);
473 extern int trace_selftest_startup_hw_branches(struct tracer *trace,
474                                               struct trace_array *tr);
475 extern int trace_selftest_startup_ksym(struct tracer *trace,
476                                          struct trace_array *tr);
477 #endif /* CONFIG_FTRACE_STARTUP_TEST */
478
479 extern void *head_page(struct trace_array_cpu *data);
480 extern unsigned long long ns2usecs(cycle_t nsec);
481 extern int
482 trace_vbprintk(unsigned long ip, const char *fmt, va_list args);
483 extern int
484 trace_vprintk(unsigned long ip, const char *fmt, va_list args);
485 extern int
486 trace_array_vprintk(struct trace_array *tr,
487                     unsigned long ip, const char *fmt, va_list args);
488 int trace_array_printk(struct trace_array *tr,
489                        unsigned long ip, const char *fmt, ...);
490
491 extern unsigned long trace_flags;
492
493 extern int trace_clock_id;
494
495 /* Standard output formatting function used for function return traces */
496 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
497
498 /* Flag options */
499 #define TRACE_GRAPH_PRINT_OVERRUN       0x1
500 #define TRACE_GRAPH_PRINT_CPU           0x2
501 #define TRACE_GRAPH_PRINT_OVERHEAD      0x4
502 #define TRACE_GRAPH_PRINT_PROC          0x8
503 #define TRACE_GRAPH_PRINT_DURATION      0x10
504 #define TRACE_GRAPH_PRINT_ABS_TIME      0x20
505
506 extern enum print_line_t
507 print_graph_function_flags(struct trace_iterator *iter, u32 flags);
508 extern void print_graph_headers_flags(struct seq_file *s, u32 flags);
509 extern enum print_line_t
510 trace_print_graph_duration(unsigned long long duration, struct trace_seq *s);
511 extern void graph_trace_open(struct trace_iterator *iter);
512 extern void graph_trace_close(struct trace_iterator *iter);
513 extern int __trace_graph_entry(struct trace_array *tr,
514                                struct ftrace_graph_ent *trace,
515                                unsigned long flags, int pc);
516 extern void __trace_graph_return(struct trace_array *tr,
517                                  struct ftrace_graph_ret *trace,
518                                  unsigned long flags, int pc);
519
520
521 #ifdef CONFIG_DYNAMIC_FTRACE
522 /* TODO: make this variable */
523 #define FTRACE_GRAPH_MAX_FUNCS          32
524 extern int ftrace_graph_filter_enabled;
525 extern int ftrace_graph_count;
526 extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS];
527
528 static inline int ftrace_graph_addr(unsigned long addr)
529 {
530         int i;
531
532         if (!ftrace_graph_filter_enabled)
533                 return 1;
534
535         for (i = 0; i < ftrace_graph_count; i++) {
536                 if (addr == ftrace_graph_funcs[i])
537                         return 1;
538         }
539
540         return 0;
541 }
542 #else
543 static inline int ftrace_graph_addr(unsigned long addr)
544 {
545         return 1;
546 }
547 #endif /* CONFIG_DYNAMIC_FTRACE */
548 #else /* CONFIG_FUNCTION_GRAPH_TRACER */
549 static inline enum print_line_t
550 print_graph_function_flags(struct trace_iterator *iter, u32 flags)
551 {
552         return TRACE_TYPE_UNHANDLED;
553 }
554 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
555
556 extern struct list_head ftrace_pids;
557
558 #ifdef CONFIG_FUNCTION_TRACER
559 static inline int ftrace_trace_task(struct task_struct *task)
560 {
561         if (list_empty(&ftrace_pids))
562                 return 1;
563
564         return test_tsk_trace_trace(task);
565 }
566 #else
567 static inline int ftrace_trace_task(struct task_struct *task)
568 {
569         return 1;
570 }
571 #endif
572
573 /*
574  * struct trace_parser - servers for reading the user input separated by spaces
575  * @cont: set if the input is not complete - no final space char was found
576  * @buffer: holds the parsed user input
577  * @idx: user input length
578  * @size: buffer size
579  */
580 struct trace_parser {
581         bool            cont;
582         char            *buffer;
583         unsigned        idx;
584         unsigned        size;
585 };
586
587 static inline bool trace_parser_loaded(struct trace_parser *parser)
588 {
589         return (parser->idx != 0);
590 }
591
592 static inline bool trace_parser_cont(struct trace_parser *parser)
593 {
594         return parser->cont;
595 }
596
597 static inline void trace_parser_clear(struct trace_parser *parser)
598 {
599         parser->cont = false;
600         parser->idx = 0;
601 }
602
603 extern int trace_parser_get_init(struct trace_parser *parser, int size);
604 extern void trace_parser_put(struct trace_parser *parser);
605 extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
606         size_t cnt, loff_t *ppos);
607
608 /*
609  * trace_iterator_flags is an enumeration that defines bit
610  * positions into trace_flags that controls the output.
611  *
612  * NOTE: These bits must match the trace_options array in
613  *       trace.c.
614  */
615 enum trace_iterator_flags {
616         TRACE_ITER_PRINT_PARENT         = 0x01,
617         TRACE_ITER_SYM_OFFSET           = 0x02,
618         TRACE_ITER_SYM_ADDR             = 0x04,
619         TRACE_ITER_VERBOSE              = 0x08,
620         TRACE_ITER_RAW                  = 0x10,
621         TRACE_ITER_HEX                  = 0x20,
622         TRACE_ITER_BIN                  = 0x40,
623         TRACE_ITER_BLOCK                = 0x80,
624         TRACE_ITER_STACKTRACE           = 0x100,
625         TRACE_ITER_PRINTK               = 0x200,
626         TRACE_ITER_PREEMPTONLY          = 0x400,
627         TRACE_ITER_BRANCH               = 0x800,
628         TRACE_ITER_ANNOTATE             = 0x1000,
629         TRACE_ITER_USERSTACKTRACE       = 0x2000,
630         TRACE_ITER_SYM_USEROBJ          = 0x4000,
631         TRACE_ITER_PRINTK_MSGONLY       = 0x8000,
632         TRACE_ITER_CONTEXT_INFO         = 0x10000, /* Print pid/cpu/time */
633         TRACE_ITER_LATENCY_FMT          = 0x20000,
634         TRACE_ITER_SLEEP_TIME           = 0x40000,
635         TRACE_ITER_GRAPH_TIME           = 0x80000,
636 };
637
638 /*
639  * TRACE_ITER_SYM_MASK masks the options in trace_flags that
640  * control the output of kernel symbols.
641  */
642 #define TRACE_ITER_SYM_MASK \
643         (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR)
644
645 extern struct tracer nop_trace;
646
647 /**
648  * ftrace_preempt_disable - disable preemption scheduler safe
649  *
650  * When tracing can happen inside the scheduler, there exists
651  * cases that the tracing might happen before the need_resched
652  * flag is checked. If this happens and the tracer calls
653  * preempt_enable (after a disable), a schedule might take place
654  * causing an infinite recursion.
655  *
656  * To prevent this, we read the need_resched flag before
657  * disabling preemption. When we want to enable preemption we
658  * check the flag, if it is set, then we call preempt_enable_no_resched.
659  * Otherwise, we call preempt_enable.
660  *
661  * The rational for doing the above is that if need_resched is set
662  * and we have yet to reschedule, we are either in an atomic location
663  * (where we do not need to check for scheduling) or we are inside
664  * the scheduler and do not want to resched.
665  */
666 static inline int ftrace_preempt_disable(void)
667 {
668         int resched;
669
670         resched = need_resched();
671         preempt_disable_notrace();
672
673         return resched;
674 }
675
676 /**
677  * ftrace_preempt_enable - enable preemption scheduler safe
678  * @resched: the return value from ftrace_preempt_disable
679  *
680  * This is a scheduler safe way to enable preemption and not miss
681  * any preemption checks. The disabled saved the state of preemption.
682  * If resched is set, then we are either inside an atomic or
683  * are inside the scheduler (we would have already scheduled
684  * otherwise). In this case, we do not want to call normal
685  * preempt_enable, but preempt_enable_no_resched instead.
686  */
687 static inline void ftrace_preempt_enable(int resched)
688 {
689         if (resched)
690                 preempt_enable_no_resched_notrace();
691         else
692                 preempt_enable_notrace();
693 }
694
695 #ifdef CONFIG_BRANCH_TRACER
696 extern int enable_branch_tracing(struct trace_array *tr);
697 extern void disable_branch_tracing(void);
698 static inline int trace_branch_enable(struct trace_array *tr)
699 {
700         if (trace_flags & TRACE_ITER_BRANCH)
701                 return enable_branch_tracing(tr);
702         return 0;
703 }
704 static inline void trace_branch_disable(void)
705 {
706         /* due to races, always disable */
707         disable_branch_tracing();
708 }
709 #else
710 static inline int trace_branch_enable(struct trace_array *tr)
711 {
712         return 0;
713 }
714 static inline void trace_branch_disable(void)
715 {
716 }
717 #endif /* CONFIG_BRANCH_TRACER */
718
719 /* set ring buffers to default size if not already done so */
720 int tracing_update_buffers(void);
721
722 /* trace event type bit fields, not numeric */
723 enum {
724         TRACE_EVENT_TYPE_PRINTF         = 1,
725         TRACE_EVENT_TYPE_RAW            = 2,
726 };
727
728 struct ftrace_event_field {
729         struct list_head        link;
730         char                    *name;
731         char                    *type;
732         int                     filter_type;
733         int                     offset;
734         int                     size;
735         int                     is_signed;
736 };
737
738 struct event_filter {
739         int                     n_preds;
740         struct filter_pred      **preds;
741         char                    *filter_string;
742 };
743
744 struct event_subsystem {
745         struct list_head        list;
746         const char              *name;
747         struct dentry           *entry;
748         struct event_filter     *filter;
749         int                     nr_events;
750 };
751
752 struct filter_pred;
753 struct regex;
754
755 typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event,
756                                  int val1, int val2);
757
758 typedef int (*regex_match_func)(char *str, struct regex *r, int len);
759
760 enum regex_type {
761         MATCH_FULL = 0,
762         MATCH_FRONT_ONLY,
763         MATCH_MIDDLE_ONLY,
764         MATCH_END_ONLY,
765 };
766
767 struct regex {
768         char                    pattern[MAX_FILTER_STR_VAL];
769         int                     len;
770         int                     field_len;
771         regex_match_func        match;
772 };
773
774 struct filter_pred {
775         filter_pred_fn_t        fn;
776         u64                     val;
777         struct regex            regex;
778         char                    *field_name;
779         int                     offset;
780         int                     not;
781         int                     op;
782         int                     pop_n;
783 };
784
785 extern enum regex_type
786 filter_parse_regex(char *buff, int len, char **search, int *not);
787 extern void print_event_filter(struct ftrace_event_call *call,
788                                struct trace_seq *s);
789 extern int apply_event_filter(struct ftrace_event_call *call,
790                               char *filter_string);
791 extern int apply_subsystem_event_filter(struct event_subsystem *system,
792                                         char *filter_string);
793 extern void print_subsystem_event_filter(struct event_subsystem *system,
794                                          struct trace_seq *s);
795 extern int filter_assign_type(const char *type);
796
797 struct list_head *
798 trace_get_fields(struct ftrace_event_call *event_call);
799
800 static inline int
801 filter_check_discard(struct ftrace_event_call *call, void *rec,
802                      struct ring_buffer *buffer,
803                      struct ring_buffer_event *event)
804 {
805         if (unlikely(call->filter_active) &&
806             !filter_match_preds(call->filter, rec)) {
807                 ring_buffer_discard_commit(buffer, event);
808                 return 1;
809         }
810
811         return 0;
812 }
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 */