tracing: add trace_array_printk for internal tracers to use
[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/ftrace.h>
11 #include <trace/boot.h>
12 #include <linux/kmemtrace.h>
13 #include <trace/power.h>
14
15 #include <linux/trace_seq.h>
16 #include <linux/ftrace_event.h>
17
18 enum trace_type {
19         __TRACE_FIRST_TYPE = 0,
20
21         TRACE_FN,
22         TRACE_CTX,
23         TRACE_WAKE,
24         TRACE_STACK,
25         TRACE_PRINT,
26         TRACE_BPRINT,
27         TRACE_SPECIAL,
28         TRACE_MMIO_RW,
29         TRACE_MMIO_MAP,
30         TRACE_BRANCH,
31         TRACE_BOOT_CALL,
32         TRACE_BOOT_RET,
33         TRACE_GRAPH_RET,
34         TRACE_GRAPH_ENT,
35         TRACE_USER_STACK,
36         TRACE_HW_BRANCHES,
37         TRACE_KMEM_ALLOC,
38         TRACE_KMEM_FREE,
39         TRACE_POWER,
40         TRACE_BLK,
41
42         __TRACE_LAST_TYPE,
43 };
44
45 /*
46  * Function trace entry - function address and parent function addres:
47  */
48 struct ftrace_entry {
49         struct trace_entry      ent;
50         unsigned long           ip;
51         unsigned long           parent_ip;
52 };
53
54 /* Function call entry */
55 struct ftrace_graph_ent_entry {
56         struct trace_entry              ent;
57         struct ftrace_graph_ent         graph_ent;
58 };
59
60 /* Function return entry */
61 struct ftrace_graph_ret_entry {
62         struct trace_entry              ent;
63         struct ftrace_graph_ret         ret;
64 };
65 extern struct tracer boot_tracer;
66
67 /*
68  * Context switch trace entry - which task (and prio) we switched from/to:
69  */
70 struct ctx_switch_entry {
71         struct trace_entry      ent;
72         unsigned int            prev_pid;
73         unsigned char           prev_prio;
74         unsigned char           prev_state;
75         unsigned int            next_pid;
76         unsigned char           next_prio;
77         unsigned char           next_state;
78         unsigned int            next_cpu;
79 };
80
81 /*
82  * Special (free-form) trace entry:
83  */
84 struct special_entry {
85         struct trace_entry      ent;
86         unsigned long           arg1;
87         unsigned long           arg2;
88         unsigned long           arg3;
89 };
90
91 /*
92  * Stack-trace entry:
93  */
94
95 #define FTRACE_STACK_ENTRIES    8
96
97 struct stack_entry {
98         struct trace_entry      ent;
99         unsigned long           caller[FTRACE_STACK_ENTRIES];
100 };
101
102 struct userstack_entry {
103         struct trace_entry      ent;
104         unsigned long           caller[FTRACE_STACK_ENTRIES];
105 };
106
107 /*
108  * trace_printk entry:
109  */
110 struct bprint_entry {
111         struct trace_entry      ent;
112         unsigned long           ip;
113         const char              *fmt;
114         u32                     buf[];
115 };
116
117 struct print_entry {
118         struct trace_entry      ent;
119         unsigned long           ip;
120         char                    buf[];
121 };
122
123 #define TRACE_OLD_SIZE          88
124
125 struct trace_field_cont {
126         unsigned char           type;
127         /* Temporary till we get rid of this completely */
128         char                    buf[TRACE_OLD_SIZE - 1];
129 };
130
131 struct trace_mmiotrace_rw {
132         struct trace_entry      ent;
133         struct mmiotrace_rw     rw;
134 };
135
136 struct trace_mmiotrace_map {
137         struct trace_entry      ent;
138         struct mmiotrace_map    map;
139 };
140
141 struct trace_boot_call {
142         struct trace_entry      ent;
143         struct boot_trace_call boot_call;
144 };
145
146 struct trace_boot_ret {
147         struct trace_entry      ent;
148         struct boot_trace_ret boot_ret;
149 };
150
151 #define TRACE_FUNC_SIZE 30
152 #define TRACE_FILE_SIZE 20
153 struct trace_branch {
154         struct trace_entry      ent;
155         unsigned                line;
156         char                    func[TRACE_FUNC_SIZE+1];
157         char                    file[TRACE_FILE_SIZE+1];
158         char                    correct;
159 };
160
161 struct hw_branch_entry {
162         struct trace_entry      ent;
163         u64                     from;
164         u64                     to;
165 };
166
167 struct trace_power {
168         struct trace_entry      ent;
169         struct power_trace      state_data;
170 };
171
172 enum kmemtrace_type_id {
173         KMEMTRACE_TYPE_KMALLOC = 0,     /* kmalloc() or kfree(). */
174         KMEMTRACE_TYPE_CACHE,           /* kmem_cache_*(). */
175         KMEMTRACE_TYPE_PAGES,           /* __get_free_pages() and friends. */
176 };
177
178 struct kmemtrace_alloc_entry {
179         struct trace_entry      ent;
180         enum kmemtrace_type_id type_id;
181         unsigned long call_site;
182         const void *ptr;
183         size_t bytes_req;
184         size_t bytes_alloc;
185         gfp_t gfp_flags;
186         int node;
187 };
188
189 struct kmemtrace_free_entry {
190         struct trace_entry      ent;
191         enum kmemtrace_type_id type_id;
192         unsigned long call_site;
193         const void *ptr;
194 };
195
196 struct syscall_trace_enter {
197         struct trace_entry      ent;
198         int                     nr;
199         unsigned long           args[];
200 };
201
202 struct syscall_trace_exit {
203         struct trace_entry      ent;
204         int                     nr;
205         unsigned long           ret;
206 };
207
208
209 /*
210  * trace_flag_type is an enumeration that holds different
211  * states when a trace occurs. These are:
212  *  IRQS_OFF            - interrupts were disabled
213  *  IRQS_NOSUPPORT      - arch does not support irqs_disabled_flags
214  *  NEED_RESCED         - reschedule is requested
215  *  HARDIRQ             - inside an interrupt handler
216  *  SOFTIRQ             - inside a softirq handler
217  */
218 enum trace_flag_type {
219         TRACE_FLAG_IRQS_OFF             = 0x01,
220         TRACE_FLAG_IRQS_NOSUPPORT       = 0x02,
221         TRACE_FLAG_NEED_RESCHED         = 0x04,
222         TRACE_FLAG_HARDIRQ              = 0x08,
223         TRACE_FLAG_SOFTIRQ              = 0x10,
224 };
225
226 #define TRACE_BUF_SIZE          1024
227
228 /*
229  * The CPU trace array - it consists of thousands of trace entries
230  * plus some other descriptor data: (for example which task started
231  * the trace, etc.)
232  */
233 struct trace_array_cpu {
234         atomic_t                disabled;
235         void                    *buffer_page;   /* ring buffer spare */
236
237         unsigned long           saved_latency;
238         unsigned long           critical_start;
239         unsigned long           critical_end;
240         unsigned long           critical_sequence;
241         unsigned long           nice;
242         unsigned long           policy;
243         unsigned long           rt_priority;
244         unsigned long           skipped_entries;
245         cycle_t                 preempt_timestamp;
246         pid_t                   pid;
247         uid_t                   uid;
248         char                    comm[TASK_COMM_LEN];
249 };
250
251 /*
252  * The trace array - an array of per-CPU trace arrays. This is the
253  * highest level data structure that individual tracers deal with.
254  * They have on/off state as well:
255  */
256 struct trace_array {
257         struct ring_buffer      *buffer;
258         unsigned long           entries;
259         int                     cpu;
260         cycle_t                 time_start;
261         struct task_struct      *waiter;
262         struct trace_array_cpu  *data[NR_CPUS];
263 };
264
265 #define FTRACE_CMP_TYPE(var, type) \
266         __builtin_types_compatible_p(typeof(var), type *)
267
268 #undef IF_ASSIGN
269 #define IF_ASSIGN(var, entry, etype, id)                \
270         if (FTRACE_CMP_TYPE(var, etype)) {              \
271                 var = (typeof(var))(entry);             \
272                 WARN_ON(id && (entry)->type != id);     \
273                 break;                                  \
274         }
275
276 /* Will cause compile errors if type is not found. */
277 extern void __ftrace_bad_type(void);
278
279 /*
280  * The trace_assign_type is a verifier that the entry type is
281  * the same as the type being assigned. To add new types simply
282  * add a line with the following format:
283  *
284  * IF_ASSIGN(var, ent, type, id);
285  *
286  *  Where "type" is the trace type that includes the trace_entry
287  *  as the "ent" item. And "id" is the trace identifier that is
288  *  used in the trace_type enum.
289  *
290  *  If the type can have more than one id, then use zero.
291  */
292 #define trace_assign_type(var, ent)                                     \
293         do {                                                            \
294                 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN);     \
295                 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0);        \
296                 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK);   \
297                 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\
298                 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT);   \
299                 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \
300                 IF_ASSIGN(var, ent, struct special_entry, 0);           \
301                 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw,          \
302                           TRACE_MMIO_RW);                               \
303                 IF_ASSIGN(var, ent, struct trace_mmiotrace_map,         \
304                           TRACE_MMIO_MAP);                              \
305                 IF_ASSIGN(var, ent, struct trace_boot_call, TRACE_BOOT_CALL);\
306                 IF_ASSIGN(var, ent, struct trace_boot_ret, TRACE_BOOT_RET);\
307                 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \
308                 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry,      \
309                           TRACE_GRAPH_ENT);             \
310                 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry,      \
311                           TRACE_GRAPH_RET);             \
312                 IF_ASSIGN(var, ent, struct hw_branch_entry, TRACE_HW_BRANCHES);\
313                 IF_ASSIGN(var, ent, struct trace_power, TRACE_POWER); \
314                 IF_ASSIGN(var, ent, struct kmemtrace_alloc_entry,       \
315                           TRACE_KMEM_ALLOC);    \
316                 IF_ASSIGN(var, ent, struct kmemtrace_free_entry,        \
317                           TRACE_KMEM_FREE);     \
318                 __ftrace_bad_type();                                    \
319         } while (0)
320
321 /*
322  * An option specific to a tracer. This is a boolean value.
323  * The bit is the bit index that sets its value on the
324  * flags value in struct tracer_flags.
325  */
326 struct tracer_opt {
327         const char      *name; /* Will appear on the trace_options file */
328         u32             bit; /* Mask assigned in val field in tracer_flags */
329 };
330
331 /*
332  * The set of specific options for a tracer. Your tracer
333  * have to set the initial value of the flags val.
334  */
335 struct tracer_flags {
336         u32                     val;
337         struct tracer_opt       *opts;
338 };
339
340 /* Makes more easy to define a tracer opt */
341 #define TRACER_OPT(s, b)        .name = #s, .bit = b
342
343
344 /**
345  * struct tracer - a specific tracer and its callbacks to interact with debugfs
346  * @name: the name chosen to select it on the available_tracers file
347  * @init: called when one switches to this tracer (echo name > current_tracer)
348  * @reset: called when one switches to another tracer
349  * @start: called when tracing is unpaused (echo 1 > tracing_enabled)
350  * @stop: called when tracing is paused (echo 0 > tracing_enabled)
351  * @open: called when the trace file is opened
352  * @pipe_open: called when the trace_pipe file is opened
353  * @wait_pipe: override how the user waits for traces on trace_pipe
354  * @close: called when the trace file is released
355  * @read: override the default read callback on trace_pipe
356  * @splice_read: override the default splice_read callback on trace_pipe
357  * @selftest: selftest to run on boot (see trace_selftest.c)
358  * @print_headers: override the first lines that describe your columns
359  * @print_line: callback that prints a trace
360  * @set_flag: signals one of your private flags changed (trace_options file)
361  * @flags: your private flags
362  */
363 struct tracer {
364         const char              *name;
365         int                     (*init)(struct trace_array *tr);
366         void                    (*reset)(struct trace_array *tr);
367         void                    (*start)(struct trace_array *tr);
368         void                    (*stop)(struct trace_array *tr);
369         void                    (*open)(struct trace_iterator *iter);
370         void                    (*pipe_open)(struct trace_iterator *iter);
371         void                    (*wait_pipe)(struct trace_iterator *iter);
372         void                    (*close)(struct trace_iterator *iter);
373         ssize_t                 (*read)(struct trace_iterator *iter,
374                                         struct file *filp, char __user *ubuf,
375                                         size_t cnt, loff_t *ppos);
376         ssize_t                 (*splice_read)(struct trace_iterator *iter,
377                                                struct file *filp,
378                                                loff_t *ppos,
379                                                struct pipe_inode_info *pipe,
380                                                size_t len,
381                                                unsigned int flags);
382 #ifdef CONFIG_FTRACE_STARTUP_TEST
383         int                     (*selftest)(struct tracer *trace,
384                                             struct trace_array *tr);
385 #endif
386         void                    (*print_header)(struct seq_file *m);
387         enum print_line_t       (*print_line)(struct trace_iterator *iter);
388         /* If you handled the flag setting, return 0 */
389         int                     (*set_flag)(u32 old_flags, u32 bit, int set);
390         struct tracer           *next;
391         int                     print_max;
392         struct tracer_flags     *flags;
393         struct tracer_stat      *stats;
394 };
395
396
397 #define TRACE_PIPE_ALL_CPU      -1
398
399 int tracer_init(struct tracer *t, struct trace_array *tr);
400 int tracing_is_enabled(void);
401 void trace_wake_up(void);
402 void tracing_reset(struct trace_array *tr, int cpu);
403 void tracing_reset_online_cpus(struct trace_array *tr);
404 void tracing_reset_current(int cpu);
405 void tracing_reset_current_online_cpus(void);
406 int tracing_open_generic(struct inode *inode, struct file *filp);
407 struct dentry *trace_create_file(const char *name,
408                                  mode_t mode,
409                                  struct dentry *parent,
410                                  void *data,
411                                  const struct file_operations *fops);
412
413 struct dentry *tracing_init_dentry(void);
414 void init_tracer_sysprof_debugfs(struct dentry *d_tracer);
415
416 struct ring_buffer_event;
417
418 struct ring_buffer_event *
419 trace_buffer_lock_reserve(struct ring_buffer *buffer,
420                           int type,
421                           unsigned long len,
422                           unsigned long flags,
423                           int pc);
424 void trace_buffer_unlock_commit(struct ring_buffer *buffer,
425                                 struct ring_buffer_event *event,
426                                 unsigned long flags, int pc);
427
428 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,
429                                                 struct trace_array_cpu *data);
430
431 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter,
432                                           int *ent_cpu, u64 *ent_ts);
433
434 void default_wait_pipe(struct trace_iterator *iter);
435 void poll_wait_pipe(struct trace_iterator *iter);
436
437 void ftrace(struct trace_array *tr,
438                             struct trace_array_cpu *data,
439                             unsigned long ip,
440                             unsigned long parent_ip,
441                             unsigned long flags, int pc);
442 void tracing_sched_switch_trace(struct trace_array *tr,
443                                 struct task_struct *prev,
444                                 struct task_struct *next,
445                                 unsigned long flags, int pc);
446
447 void tracing_sched_wakeup_trace(struct trace_array *tr,
448                                 struct task_struct *wakee,
449                                 struct task_struct *cur,
450                                 unsigned long flags, int pc);
451 void trace_special(struct trace_array *tr,
452                    struct trace_array_cpu *data,
453                    unsigned long arg1,
454                    unsigned long arg2,
455                    unsigned long arg3, int pc);
456 void trace_function(struct trace_array *tr,
457                     unsigned long ip,
458                     unsigned long parent_ip,
459                     unsigned long flags, int pc);
460
461 void trace_graph_return(struct ftrace_graph_ret *trace);
462 int trace_graph_entry(struct ftrace_graph_ent *trace);
463 void set_graph_array(struct trace_array *tr);
464
465 void tracing_start_cmdline_record(void);
466 void tracing_stop_cmdline_record(void);
467 void tracing_sched_switch_assign_trace(struct trace_array *tr);
468 void tracing_stop_sched_switch_record(void);
469 void tracing_start_sched_switch_record(void);
470 int register_tracer(struct tracer *type);
471 void unregister_tracer(struct tracer *type);
472
473 extern unsigned long nsecs_to_usecs(unsigned long nsecs);
474
475 #ifdef CONFIG_TRACER_MAX_TRACE
476 extern unsigned long tracing_max_latency;
477 extern unsigned long tracing_thresh;
478
479 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu);
480 void update_max_tr_single(struct trace_array *tr,
481                           struct task_struct *tsk, int cpu);
482 #endif /* CONFIG_TRACER_MAX_TRACE */
483
484 #ifdef CONFIG_STACKTRACE
485 void ftrace_trace_stack(struct ring_buffer *buffer, unsigned long flags,
486                         int skip, int pc);
487
488 void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags,
489                             int pc);
490
491 void __trace_stack(struct trace_array *tr, unsigned long flags, int skip,
492                    int pc);
493 #else
494 static inline void ftrace_trace_stack(struct trace_array *tr,
495                                       unsigned long flags, int skip, int pc)
496 {
497 }
498
499 static inline void ftrace_trace_userstack(struct trace_array *tr,
500                                           unsigned long flags, int pc)
501 {
502 }
503
504 static inline void __trace_stack(struct trace_array *tr, unsigned long flags,
505                                  int skip, int pc)
506 {
507 }
508 #endif /* CONFIG_STACKTRACE */
509
510 extern cycle_t ftrace_now(int cpu);
511
512 #ifdef CONFIG_CONTEXT_SWITCH_TRACER
513 typedef void
514 (*tracer_switch_func_t)(void *private,
515                         void *__rq,
516                         struct task_struct *prev,
517                         struct task_struct *next);
518
519 struct tracer_switch_ops {
520         tracer_switch_func_t            func;
521         void                            *private;
522         struct tracer_switch_ops        *next;
523 };
524 #endif /* CONFIG_CONTEXT_SWITCH_TRACER */
525
526 extern void trace_find_cmdline(int pid, char comm[]);
527
528 #ifdef CONFIG_DYNAMIC_FTRACE
529 extern unsigned long ftrace_update_tot_cnt;
530 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
531 extern int DYN_FTRACE_TEST_NAME(void);
532 #endif
533
534 extern int ring_buffer_expanded;
535 extern bool tracing_selftest_disabled;
536 DECLARE_PER_CPU(local_t, ftrace_cpu_disabled);
537
538 #ifdef CONFIG_FTRACE_STARTUP_TEST
539 extern int trace_selftest_startup_function(struct tracer *trace,
540                                            struct trace_array *tr);
541 extern int trace_selftest_startup_function_graph(struct tracer *trace,
542                                                  struct trace_array *tr);
543 extern int trace_selftest_startup_irqsoff(struct tracer *trace,
544                                           struct trace_array *tr);
545 extern int trace_selftest_startup_preemptoff(struct tracer *trace,
546                                              struct trace_array *tr);
547 extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace,
548                                                  struct trace_array *tr);
549 extern int trace_selftest_startup_wakeup(struct tracer *trace,
550                                          struct trace_array *tr);
551 extern int trace_selftest_startup_nop(struct tracer *trace,
552                                          struct trace_array *tr);
553 extern int trace_selftest_startup_sched_switch(struct tracer *trace,
554                                                struct trace_array *tr);
555 extern int trace_selftest_startup_sysprof(struct tracer *trace,
556                                                struct trace_array *tr);
557 extern int trace_selftest_startup_branch(struct tracer *trace,
558                                          struct trace_array *tr);
559 extern int trace_selftest_startup_hw_branches(struct tracer *trace,
560                                               struct trace_array *tr);
561 #endif /* CONFIG_FTRACE_STARTUP_TEST */
562
563 extern void *head_page(struct trace_array_cpu *data);
564 extern unsigned long long ns2usecs(cycle_t nsec);
565 extern int
566 trace_vbprintk(unsigned long ip, const char *fmt, va_list args);
567 extern int
568 trace_vprintk(unsigned long ip, const char *fmt, va_list args);
569 extern int
570 trace_array_vprintk(struct trace_array *tr,
571                     unsigned long ip, const char *fmt, va_list args);
572 int trace_array_printk(struct trace_array *tr,
573                        unsigned long ip, const char *fmt, ...);
574
575 extern unsigned long trace_flags;
576
577 extern int trace_clock_id;
578
579 /* Standard output formatting function used for function return traces */
580 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
581 extern enum print_line_t print_graph_function(struct trace_iterator *iter);
582 extern enum print_line_t
583 trace_print_graph_duration(unsigned long long duration, struct trace_seq *s);
584
585 #ifdef CONFIG_DYNAMIC_FTRACE
586 /* TODO: make this variable */
587 #define FTRACE_GRAPH_MAX_FUNCS          32
588 extern int ftrace_graph_count;
589 extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS];
590
591 static inline int ftrace_graph_addr(unsigned long addr)
592 {
593         int i;
594
595         if (!ftrace_graph_count || test_tsk_trace_graph(current))
596                 return 1;
597
598         for (i = 0; i < ftrace_graph_count; i++) {
599                 if (addr == ftrace_graph_funcs[i])
600                         return 1;
601         }
602
603         return 0;
604 }
605 #else
606 static inline int ftrace_trace_addr(unsigned long addr)
607 {
608         return 1;
609 }
610 static inline int ftrace_graph_addr(unsigned long addr)
611 {
612         return 1;
613 }
614 #endif /* CONFIG_DYNAMIC_FTRACE */
615 #else /* CONFIG_FUNCTION_GRAPH_TRACER */
616 static inline enum print_line_t
617 print_graph_function(struct trace_iterator *iter)
618 {
619         return TRACE_TYPE_UNHANDLED;
620 }
621 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
622
623 extern struct pid *ftrace_pid_trace;
624
625 #ifdef CONFIG_FUNCTION_TRACER
626 static inline int ftrace_trace_task(struct task_struct *task)
627 {
628         if (!ftrace_pid_trace)
629                 return 1;
630
631         return test_tsk_trace_trace(task);
632 }
633 #else
634 static inline int ftrace_trace_task(struct task_struct *task)
635 {
636         return 1;
637 }
638 #endif
639
640 /*
641  * trace_iterator_flags is an enumeration that defines bit
642  * positions into trace_flags that controls the output.
643  *
644  * NOTE: These bits must match the trace_options array in
645  *       trace.c.
646  */
647 enum trace_iterator_flags {
648         TRACE_ITER_PRINT_PARENT         = 0x01,
649         TRACE_ITER_SYM_OFFSET           = 0x02,
650         TRACE_ITER_SYM_ADDR             = 0x04,
651         TRACE_ITER_VERBOSE              = 0x08,
652         TRACE_ITER_RAW                  = 0x10,
653         TRACE_ITER_HEX                  = 0x20,
654         TRACE_ITER_BIN                  = 0x40,
655         TRACE_ITER_BLOCK                = 0x80,
656         TRACE_ITER_STACKTRACE           = 0x100,
657         TRACE_ITER_SCHED_TREE           = 0x200,
658         TRACE_ITER_PRINTK               = 0x400,
659         TRACE_ITER_PREEMPTONLY          = 0x800,
660         TRACE_ITER_BRANCH               = 0x1000,
661         TRACE_ITER_ANNOTATE             = 0x2000,
662         TRACE_ITER_USERSTACKTRACE       = 0x4000,
663         TRACE_ITER_SYM_USEROBJ          = 0x8000,
664         TRACE_ITER_PRINTK_MSGONLY       = 0x10000,
665         TRACE_ITER_CONTEXT_INFO         = 0x20000, /* Print pid/cpu/time */
666         TRACE_ITER_LATENCY_FMT          = 0x40000,
667         TRACE_ITER_SLEEP_TIME           = 0x80000,
668         TRACE_ITER_GRAPH_TIME           = 0x100000,
669 };
670
671 /*
672  * TRACE_ITER_SYM_MASK masks the options in trace_flags that
673  * control the output of kernel symbols.
674  */
675 #define TRACE_ITER_SYM_MASK \
676         (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR)
677
678 extern struct tracer nop_trace;
679
680 /**
681  * ftrace_preempt_disable - disable preemption scheduler safe
682  *
683  * When tracing can happen inside the scheduler, there exists
684  * cases that the tracing might happen before the need_resched
685  * flag is checked. If this happens and the tracer calls
686  * preempt_enable (after a disable), a schedule might take place
687  * causing an infinite recursion.
688  *
689  * To prevent this, we read the need_resched flag before
690  * disabling preemption. When we want to enable preemption we
691  * check the flag, if it is set, then we call preempt_enable_no_resched.
692  * Otherwise, we call preempt_enable.
693  *
694  * The rational for doing the above is that if need_resched is set
695  * and we have yet to reschedule, we are either in an atomic location
696  * (where we do not need to check for scheduling) or we are inside
697  * the scheduler and do not want to resched.
698  */
699 static inline int ftrace_preempt_disable(void)
700 {
701         int resched;
702
703         resched = need_resched();
704         preempt_disable_notrace();
705
706         return resched;
707 }
708
709 /**
710  * ftrace_preempt_enable - enable preemption scheduler safe
711  * @resched: the return value from ftrace_preempt_disable
712  *
713  * This is a scheduler safe way to enable preemption and not miss
714  * any preemption checks. The disabled saved the state of preemption.
715  * If resched is set, then we are either inside an atomic or
716  * are inside the scheduler (we would have already scheduled
717  * otherwise). In this case, we do not want to call normal
718  * preempt_enable, but preempt_enable_no_resched instead.
719  */
720 static inline void ftrace_preempt_enable(int resched)
721 {
722         if (resched)
723                 preempt_enable_no_resched_notrace();
724         else
725                 preempt_enable_notrace();
726 }
727
728 #ifdef CONFIG_BRANCH_TRACER
729 extern int enable_branch_tracing(struct trace_array *tr);
730 extern void disable_branch_tracing(void);
731 static inline int trace_branch_enable(struct trace_array *tr)
732 {
733         if (trace_flags & TRACE_ITER_BRANCH)
734                 return enable_branch_tracing(tr);
735         return 0;
736 }
737 static inline void trace_branch_disable(void)
738 {
739         /* due to races, always disable */
740         disable_branch_tracing();
741 }
742 #else
743 static inline int trace_branch_enable(struct trace_array *tr)
744 {
745         return 0;
746 }
747 static inline void trace_branch_disable(void)
748 {
749 }
750 #endif /* CONFIG_BRANCH_TRACER */
751
752 /* set ring buffers to default size if not already done so */
753 int tracing_update_buffers(void);
754
755 /* trace event type bit fields, not numeric */
756 enum {
757         TRACE_EVENT_TYPE_PRINTF         = 1,
758         TRACE_EVENT_TYPE_RAW            = 2,
759 };
760
761 struct ftrace_event_field {
762         struct list_head        link;
763         char                    *name;
764         char                    *type;
765         int                     filter_type;
766         int                     offset;
767         int                     size;
768         int                     is_signed;
769 };
770
771 struct event_filter {
772         int                     n_preds;
773         struct filter_pred      **preds;
774         char                    *filter_string;
775         bool                    no_reset;
776 };
777
778 struct event_subsystem {
779         struct list_head        list;
780         const char              *name;
781         struct dentry           *entry;
782         struct event_filter     *filter;
783         int                     nr_events;
784 };
785
786 struct filter_pred;
787
788 typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event,
789                                  int val1, int val2);
790
791 struct filter_pred {
792         filter_pred_fn_t fn;
793         u64 val;
794         char str_val[MAX_FILTER_STR_VAL];
795         int str_len;
796         char *field_name;
797         int offset;
798         int not;
799         int op;
800         int pop_n;
801 };
802
803 extern void print_event_filter(struct ftrace_event_call *call,
804                                struct trace_seq *s);
805 extern int apply_event_filter(struct ftrace_event_call *call,
806                               char *filter_string);
807 extern int apply_subsystem_event_filter(struct event_subsystem *system,
808                                         char *filter_string);
809 extern void print_subsystem_event_filter(struct event_subsystem *system,
810                                          struct trace_seq *s);
811 extern int filter_assign_type(const char *type);
812
813 static inline int
814 filter_check_discard(struct ftrace_event_call *call, void *rec,
815                      struct ring_buffer *buffer,
816                      struct ring_buffer_event *event)
817 {
818         if (unlikely(call->filter_active) && !filter_match_preds(call, rec)) {
819                 ring_buffer_discard_commit(buffer, event);
820                 return 1;
821         }
822
823         return 0;
824 }
825
826 #define DEFINE_COMPARISON_PRED(type)                                    \
827 static int filter_pred_##type(struct filter_pred *pred, void *event,    \
828                               int val1, int val2)                       \
829 {                                                                       \
830         type *addr = (type *)(event + pred->offset);                    \
831         type val = (type)pred->val;                                     \
832         int match = 0;                                                  \
833                                                                         \
834         switch (pred->op) {                                             \
835         case OP_LT:                                                     \
836                 match = (*addr < val);                                  \
837                 break;                                                  \
838         case OP_LE:                                                     \
839                 match = (*addr <= val);                                 \
840                 break;                                                  \
841         case OP_GT:                                                     \
842                 match = (*addr > val);                                  \
843                 break;                                                  \
844         case OP_GE:                                                     \
845                 match = (*addr >= val);                                 \
846                 break;                                                  \
847         default:                                                        \
848                 break;                                                  \
849         }                                                               \
850                                                                         \
851         return match;                                                   \
852 }
853
854 #define DEFINE_EQUALITY_PRED(size)                                      \
855 static int filter_pred_##size(struct filter_pred *pred, void *event,    \
856                               int val1, int val2)                       \
857 {                                                                       \
858         u##size *addr = (u##size *)(event + pred->offset);              \
859         u##size val = (u##size)pred->val;                               \
860         int match;                                                      \
861                                                                         \
862         match = (val == *addr) ^ pred->not;                             \
863                                                                         \
864         return match;                                                   \
865 }
866
867 extern struct mutex event_mutex;
868 extern struct list_head ftrace_events;
869
870 extern const char *__start___trace_bprintk_fmt[];
871 extern const char *__stop___trace_bprintk_fmt[];
872
873 #undef TRACE_EVENT_FORMAT
874 #define TRACE_EVENT_FORMAT(call, proto, args, fmt, tstruct, tpfmt)      \
875         extern struct ftrace_event_call event_##call;
876 #undef TRACE_EVENT_FORMAT_NOFILTER
877 #define TRACE_EVENT_FORMAT_NOFILTER(call, proto, args, fmt, tstruct, tpfmt)
878 #include "trace_event_types.h"
879
880 #endif /* _LINUX_KERNEL_TRACE_H */