Merge commit 'tracing/core' into tracing/kprobes
[~shefty/rdma-dev.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 struct kprobe_trace_entry {
209         struct trace_entry      ent;
210         unsigned long           ip;
211         int                     nargs;
212         unsigned long           args[];
213 };
214
215 #define SIZEOF_KPROBE_TRACE_ENTRY(n)                    \
216         (offsetof(struct kprobe_trace_entry, args) +    \
217         (sizeof(unsigned long) * (n)))
218
219 struct kretprobe_trace_entry {
220         struct trace_entry      ent;
221         unsigned long           func;
222         unsigned long           ret_ip;
223         int                     nargs;
224         unsigned long           args[];
225 };
226
227 #define SIZEOF_KRETPROBE_TRACE_ENTRY(n)                 \
228         (offsetof(struct kretprobe_trace_entry, args) + \
229         (sizeof(unsigned long) * (n)))
230
231
232
233 /*
234  * trace_flag_type is an enumeration that holds different
235  * states when a trace occurs. These are:
236  *  IRQS_OFF            - interrupts were disabled
237  *  IRQS_NOSUPPORT      - arch does not support irqs_disabled_flags
238  *  NEED_RESCED         - reschedule is requested
239  *  HARDIRQ             - inside an interrupt handler
240  *  SOFTIRQ             - inside a softirq handler
241  */
242 enum trace_flag_type {
243         TRACE_FLAG_IRQS_OFF             = 0x01,
244         TRACE_FLAG_IRQS_NOSUPPORT       = 0x02,
245         TRACE_FLAG_NEED_RESCHED         = 0x04,
246         TRACE_FLAG_HARDIRQ              = 0x08,
247         TRACE_FLAG_SOFTIRQ              = 0x10,
248 };
249
250 #define TRACE_BUF_SIZE          1024
251
252 /*
253  * The CPU trace array - it consists of thousands of trace entries
254  * plus some other descriptor data: (for example which task started
255  * the trace, etc.)
256  */
257 struct trace_array_cpu {
258         atomic_t                disabled;
259         void                    *buffer_page;   /* ring buffer spare */
260
261         unsigned long           saved_latency;
262         unsigned long           critical_start;
263         unsigned long           critical_end;
264         unsigned long           critical_sequence;
265         unsigned long           nice;
266         unsigned long           policy;
267         unsigned long           rt_priority;
268         unsigned long           skipped_entries;
269         cycle_t                 preempt_timestamp;
270         pid_t                   pid;
271         uid_t                   uid;
272         char                    comm[TASK_COMM_LEN];
273 };
274
275 /*
276  * The trace array - an array of per-CPU trace arrays. This is the
277  * highest level data structure that individual tracers deal with.
278  * They have on/off state as well:
279  */
280 struct trace_array {
281         struct ring_buffer      *buffer;
282         unsigned long           entries;
283         int                     cpu;
284         cycle_t                 time_start;
285         struct task_struct      *waiter;
286         struct trace_array_cpu  *data[NR_CPUS];
287 };
288
289 #define FTRACE_CMP_TYPE(var, type) \
290         __builtin_types_compatible_p(typeof(var), type *)
291
292 #undef IF_ASSIGN
293 #define IF_ASSIGN(var, entry, etype, id)                \
294         if (FTRACE_CMP_TYPE(var, etype)) {              \
295                 var = (typeof(var))(entry);             \
296                 WARN_ON(id && (entry)->type != id);     \
297                 break;                                  \
298         }
299
300 /* Will cause compile errors if type is not found. */
301 extern void __ftrace_bad_type(void);
302
303 /*
304  * The trace_assign_type is a verifier that the entry type is
305  * the same as the type being assigned. To add new types simply
306  * add a line with the following format:
307  *
308  * IF_ASSIGN(var, ent, type, id);
309  *
310  *  Where "type" is the trace type that includes the trace_entry
311  *  as the "ent" item. And "id" is the trace identifier that is
312  *  used in the trace_type enum.
313  *
314  *  If the type can have more than one id, then use zero.
315  */
316 #define trace_assign_type(var, ent)                                     \
317         do {                                                            \
318                 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN);     \
319                 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0);        \
320                 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK);   \
321                 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\
322                 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT);   \
323                 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \
324                 IF_ASSIGN(var, ent, struct special_entry, 0);           \
325                 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw,          \
326                           TRACE_MMIO_RW);                               \
327                 IF_ASSIGN(var, ent, struct trace_mmiotrace_map,         \
328                           TRACE_MMIO_MAP);                              \
329                 IF_ASSIGN(var, ent, struct trace_boot_call, TRACE_BOOT_CALL);\
330                 IF_ASSIGN(var, ent, struct trace_boot_ret, TRACE_BOOT_RET);\
331                 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \
332                 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry,      \
333                           TRACE_GRAPH_ENT);             \
334                 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry,      \
335                           TRACE_GRAPH_RET);             \
336                 IF_ASSIGN(var, ent, struct hw_branch_entry, TRACE_HW_BRANCHES);\
337                 IF_ASSIGN(var, ent, struct trace_power, TRACE_POWER); \
338                 IF_ASSIGN(var, ent, struct kmemtrace_alloc_entry,       \
339                           TRACE_KMEM_ALLOC);    \
340                 IF_ASSIGN(var, ent, struct kmemtrace_free_entry,        \
341                           TRACE_KMEM_FREE);     \
342                 __ftrace_bad_type();                                    \
343         } while (0)
344
345 /*
346  * An option specific to a tracer. This is a boolean value.
347  * The bit is the bit index that sets its value on the
348  * flags value in struct tracer_flags.
349  */
350 struct tracer_opt {
351         const char      *name; /* Will appear on the trace_options file */
352         u32             bit; /* Mask assigned in val field in tracer_flags */
353 };
354
355 /*
356  * The set of specific options for a tracer. Your tracer
357  * have to set the initial value of the flags val.
358  */
359 struct tracer_flags {
360         u32                     val;
361         struct tracer_opt       *opts;
362 };
363
364 /* Makes more easy to define a tracer opt */
365 #define TRACER_OPT(s, b)        .name = #s, .bit = b
366
367
368 /**
369  * struct tracer - a specific tracer and its callbacks to interact with debugfs
370  * @name: the name chosen to select it on the available_tracers file
371  * @init: called when one switches to this tracer (echo name > current_tracer)
372  * @reset: called when one switches to another tracer
373  * @start: called when tracing is unpaused (echo 1 > tracing_enabled)
374  * @stop: called when tracing is paused (echo 0 > tracing_enabled)
375  * @open: called when the trace file is opened
376  * @pipe_open: called when the trace_pipe file is opened
377  * @wait_pipe: override how the user waits for traces on trace_pipe
378  * @close: called when the trace file is released
379  * @read: override the default read callback on trace_pipe
380  * @splice_read: override the default splice_read callback on trace_pipe
381  * @selftest: selftest to run on boot (see trace_selftest.c)
382  * @print_headers: override the first lines that describe your columns
383  * @print_line: callback that prints a trace
384  * @set_flag: signals one of your private flags changed (trace_options file)
385  * @flags: your private flags
386  */
387 struct tracer {
388         const char              *name;
389         int                     (*init)(struct trace_array *tr);
390         void                    (*reset)(struct trace_array *tr);
391         void                    (*start)(struct trace_array *tr);
392         void                    (*stop)(struct trace_array *tr);
393         void                    (*open)(struct trace_iterator *iter);
394         void                    (*pipe_open)(struct trace_iterator *iter);
395         void                    (*wait_pipe)(struct trace_iterator *iter);
396         void                    (*close)(struct trace_iterator *iter);
397         ssize_t                 (*read)(struct trace_iterator *iter,
398                                         struct file *filp, char __user *ubuf,
399                                         size_t cnt, loff_t *ppos);
400         ssize_t                 (*splice_read)(struct trace_iterator *iter,
401                                                struct file *filp,
402                                                loff_t *ppos,
403                                                struct pipe_inode_info *pipe,
404                                                size_t len,
405                                                unsigned int flags);
406 #ifdef CONFIG_FTRACE_STARTUP_TEST
407         int                     (*selftest)(struct tracer *trace,
408                                             struct trace_array *tr);
409 #endif
410         void                    (*print_header)(struct seq_file *m);
411         enum print_line_t       (*print_line)(struct trace_iterator *iter);
412         /* If you handled the flag setting, return 0 */
413         int                     (*set_flag)(u32 old_flags, u32 bit, int set);
414         struct tracer           *next;
415         int                     print_max;
416         struct tracer_flags     *flags;
417         struct tracer_stat      *stats;
418 };
419
420
421 #define TRACE_PIPE_ALL_CPU      -1
422
423 int tracer_init(struct tracer *t, struct trace_array *tr);
424 int tracing_is_enabled(void);
425 void trace_wake_up(void);
426 void tracing_reset(struct trace_array *tr, int cpu);
427 void tracing_reset_online_cpus(struct trace_array *tr);
428 void tracing_reset_current(int cpu);
429 void tracing_reset_current_online_cpus(void);
430 int tracing_open_generic(struct inode *inode, struct file *filp);
431 struct dentry *trace_create_file(const char *name,
432                                  mode_t mode,
433                                  struct dentry *parent,
434                                  void *data,
435                                  const struct file_operations *fops);
436
437 struct dentry *tracing_init_dentry(void);
438 void init_tracer_sysprof_debugfs(struct dentry *d_tracer);
439
440 struct ring_buffer_event;
441
442 struct ring_buffer_event *
443 trace_buffer_lock_reserve(struct ring_buffer *buffer,
444                           int type,
445                           unsigned long len,
446                           unsigned long flags,
447                           int pc);
448 void trace_buffer_unlock_commit(struct ring_buffer *buffer,
449                                 struct ring_buffer_event *event,
450                                 unsigned long flags, int pc);
451
452 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,
453                                                 struct trace_array_cpu *data);
454
455 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter,
456                                           int *ent_cpu, u64 *ent_ts);
457
458 void default_wait_pipe(struct trace_iterator *iter);
459 void poll_wait_pipe(struct trace_iterator *iter);
460
461 void ftrace(struct trace_array *tr,
462                             struct trace_array_cpu *data,
463                             unsigned long ip,
464                             unsigned long parent_ip,
465                             unsigned long flags, int pc);
466 void tracing_sched_switch_trace(struct trace_array *tr,
467                                 struct task_struct *prev,
468                                 struct task_struct *next,
469                                 unsigned long flags, int pc);
470
471 void tracing_sched_wakeup_trace(struct trace_array *tr,
472                                 struct task_struct *wakee,
473                                 struct task_struct *cur,
474                                 unsigned long flags, int pc);
475 void trace_special(struct trace_array *tr,
476                    struct trace_array_cpu *data,
477                    unsigned long arg1,
478                    unsigned long arg2,
479                    unsigned long arg3, int pc);
480 void trace_function(struct trace_array *tr,
481                     unsigned long ip,
482                     unsigned long parent_ip,
483                     unsigned long flags, int pc);
484
485 void trace_graph_return(struct ftrace_graph_ret *trace);
486 int trace_graph_entry(struct ftrace_graph_ent *trace);
487 void set_graph_array(struct trace_array *tr);
488
489 void tracing_start_cmdline_record(void);
490 void tracing_stop_cmdline_record(void);
491 void tracing_sched_switch_assign_trace(struct trace_array *tr);
492 void tracing_stop_sched_switch_record(void);
493 void tracing_start_sched_switch_record(void);
494 int register_tracer(struct tracer *type);
495 void unregister_tracer(struct tracer *type);
496
497 extern unsigned long nsecs_to_usecs(unsigned long nsecs);
498
499 #ifdef CONFIG_TRACER_MAX_TRACE
500 extern unsigned long tracing_max_latency;
501 extern unsigned long tracing_thresh;
502
503 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu);
504 void update_max_tr_single(struct trace_array *tr,
505                           struct task_struct *tsk, int cpu);
506 #endif /* CONFIG_TRACER_MAX_TRACE */
507
508 #ifdef CONFIG_STACKTRACE
509 void ftrace_trace_stack(struct ring_buffer *buffer, unsigned long flags,
510                         int skip, int pc);
511
512 void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags,
513                             int pc);
514
515 void __trace_stack(struct trace_array *tr, unsigned long flags, int skip,
516                    int pc);
517 #else
518 static inline void ftrace_trace_stack(struct trace_array *tr,
519                                       unsigned long flags, int skip, int pc)
520 {
521 }
522
523 static inline void ftrace_trace_userstack(struct trace_array *tr,
524                                           unsigned long flags, int pc)
525 {
526 }
527
528 static inline void __trace_stack(struct trace_array *tr, unsigned long flags,
529                                  int skip, int pc)
530 {
531 }
532 #endif /* CONFIG_STACKTRACE */
533
534 extern cycle_t ftrace_now(int cpu);
535
536 #ifdef CONFIG_CONTEXT_SWITCH_TRACER
537 typedef void
538 (*tracer_switch_func_t)(void *private,
539                         void *__rq,
540                         struct task_struct *prev,
541                         struct task_struct *next);
542
543 struct tracer_switch_ops {
544         tracer_switch_func_t            func;
545         void                            *private;
546         struct tracer_switch_ops        *next;
547 };
548 #endif /* CONFIG_CONTEXT_SWITCH_TRACER */
549
550 extern void trace_find_cmdline(int pid, char comm[]);
551
552 #ifdef CONFIG_DYNAMIC_FTRACE
553 extern unsigned long ftrace_update_tot_cnt;
554 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
555 extern int DYN_FTRACE_TEST_NAME(void);
556 #endif
557
558 extern int ring_buffer_expanded;
559 extern bool tracing_selftest_disabled;
560 DECLARE_PER_CPU(local_t, ftrace_cpu_disabled);
561
562 #ifdef CONFIG_FTRACE_STARTUP_TEST
563 extern int trace_selftest_startup_function(struct tracer *trace,
564                                            struct trace_array *tr);
565 extern int trace_selftest_startup_function_graph(struct tracer *trace,
566                                                  struct trace_array *tr);
567 extern int trace_selftest_startup_irqsoff(struct tracer *trace,
568                                           struct trace_array *tr);
569 extern int trace_selftest_startup_preemptoff(struct tracer *trace,
570                                              struct trace_array *tr);
571 extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace,
572                                                  struct trace_array *tr);
573 extern int trace_selftest_startup_wakeup(struct tracer *trace,
574                                          struct trace_array *tr);
575 extern int trace_selftest_startup_nop(struct tracer *trace,
576                                          struct trace_array *tr);
577 extern int trace_selftest_startup_sched_switch(struct tracer *trace,
578                                                struct trace_array *tr);
579 extern int trace_selftest_startup_sysprof(struct tracer *trace,
580                                                struct trace_array *tr);
581 extern int trace_selftest_startup_branch(struct tracer *trace,
582                                          struct trace_array *tr);
583 extern int trace_selftest_startup_hw_branches(struct tracer *trace,
584                                               struct trace_array *tr);
585 #endif /* CONFIG_FTRACE_STARTUP_TEST */
586
587 extern void *head_page(struct trace_array_cpu *data);
588 extern unsigned long long ns2usecs(cycle_t nsec);
589 extern int
590 trace_vbprintk(unsigned long ip, const char *fmt, va_list args);
591 extern int
592 trace_vprintk(unsigned long ip, const char *fmt, va_list args);
593 extern int
594 trace_array_vprintk(struct trace_array *tr,
595                     unsigned long ip, const char *fmt, va_list args);
596 int trace_array_printk(struct trace_array *tr,
597                        unsigned long ip, const char *fmt, ...);
598
599 extern unsigned long trace_flags;
600
601 extern int trace_clock_id;
602
603 /* Standard output formatting function used for function return traces */
604 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
605 extern enum print_line_t print_graph_function(struct trace_iterator *iter);
606 extern enum print_line_t
607 trace_print_graph_duration(unsigned long long duration, struct trace_seq *s);
608
609 #ifdef CONFIG_DYNAMIC_FTRACE
610 /* TODO: make this variable */
611 #define FTRACE_GRAPH_MAX_FUNCS          32
612 extern int ftrace_graph_count;
613 extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS];
614
615 static inline int ftrace_graph_addr(unsigned long addr)
616 {
617         int i;
618
619         if (!ftrace_graph_count || test_tsk_trace_graph(current))
620                 return 1;
621
622         for (i = 0; i < ftrace_graph_count; i++) {
623                 if (addr == ftrace_graph_funcs[i])
624                         return 1;
625         }
626
627         return 0;
628 }
629 #else
630 static inline int ftrace_trace_addr(unsigned long addr)
631 {
632         return 1;
633 }
634 static inline int ftrace_graph_addr(unsigned long addr)
635 {
636         return 1;
637 }
638 #endif /* CONFIG_DYNAMIC_FTRACE */
639 #else /* CONFIG_FUNCTION_GRAPH_TRACER */
640 static inline enum print_line_t
641 print_graph_function(struct trace_iterator *iter)
642 {
643         return TRACE_TYPE_UNHANDLED;
644 }
645 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
646
647 extern struct pid *ftrace_pid_trace;
648
649 #ifdef CONFIG_FUNCTION_TRACER
650 static inline int ftrace_trace_task(struct task_struct *task)
651 {
652         if (!ftrace_pid_trace)
653                 return 1;
654
655         return test_tsk_trace_trace(task);
656 }
657 #else
658 static inline int ftrace_trace_task(struct task_struct *task)
659 {
660         return 1;
661 }
662 #endif
663
664 /*
665  * trace_iterator_flags is an enumeration that defines bit
666  * positions into trace_flags that controls the output.
667  *
668  * NOTE: These bits must match the trace_options array in
669  *       trace.c.
670  */
671 enum trace_iterator_flags {
672         TRACE_ITER_PRINT_PARENT         = 0x01,
673         TRACE_ITER_SYM_OFFSET           = 0x02,
674         TRACE_ITER_SYM_ADDR             = 0x04,
675         TRACE_ITER_VERBOSE              = 0x08,
676         TRACE_ITER_RAW                  = 0x10,
677         TRACE_ITER_HEX                  = 0x20,
678         TRACE_ITER_BIN                  = 0x40,
679         TRACE_ITER_BLOCK                = 0x80,
680         TRACE_ITER_STACKTRACE           = 0x100,
681         TRACE_ITER_SCHED_TREE           = 0x200,
682         TRACE_ITER_PRINTK               = 0x400,
683         TRACE_ITER_PREEMPTONLY          = 0x800,
684         TRACE_ITER_BRANCH               = 0x1000,
685         TRACE_ITER_ANNOTATE             = 0x2000,
686         TRACE_ITER_USERSTACKTRACE       = 0x4000,
687         TRACE_ITER_SYM_USEROBJ          = 0x8000,
688         TRACE_ITER_PRINTK_MSGONLY       = 0x10000,
689         TRACE_ITER_CONTEXT_INFO         = 0x20000, /* Print pid/cpu/time */
690         TRACE_ITER_LATENCY_FMT          = 0x40000,
691         TRACE_ITER_SLEEP_TIME           = 0x80000,
692         TRACE_ITER_GRAPH_TIME           = 0x100000,
693 };
694
695 /*
696  * TRACE_ITER_SYM_MASK masks the options in trace_flags that
697  * control the output of kernel symbols.
698  */
699 #define TRACE_ITER_SYM_MASK \
700         (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR)
701
702 extern struct tracer nop_trace;
703
704 /**
705  * ftrace_preempt_disable - disable preemption scheduler safe
706  *
707  * When tracing can happen inside the scheduler, there exists
708  * cases that the tracing might happen before the need_resched
709  * flag is checked. If this happens and the tracer calls
710  * preempt_enable (after a disable), a schedule might take place
711  * causing an infinite recursion.
712  *
713  * To prevent this, we read the need_resched flag before
714  * disabling preemption. When we want to enable preemption we
715  * check the flag, if it is set, then we call preempt_enable_no_resched.
716  * Otherwise, we call preempt_enable.
717  *
718  * The rational for doing the above is that if need_resched is set
719  * and we have yet to reschedule, we are either in an atomic location
720  * (where we do not need to check for scheduling) or we are inside
721  * the scheduler and do not want to resched.
722  */
723 static inline int ftrace_preempt_disable(void)
724 {
725         int resched;
726
727         resched = need_resched();
728         preempt_disable_notrace();
729
730         return resched;
731 }
732
733 /**
734  * ftrace_preempt_enable - enable preemption scheduler safe
735  * @resched: the return value from ftrace_preempt_disable
736  *
737  * This is a scheduler safe way to enable preemption and not miss
738  * any preemption checks. The disabled saved the state of preemption.
739  * If resched is set, then we are either inside an atomic or
740  * are inside the scheduler (we would have already scheduled
741  * otherwise). In this case, we do not want to call normal
742  * preempt_enable, but preempt_enable_no_resched instead.
743  */
744 static inline void ftrace_preempt_enable(int resched)
745 {
746         if (resched)
747                 preempt_enable_no_resched_notrace();
748         else
749                 preempt_enable_notrace();
750 }
751
752 #ifdef CONFIG_BRANCH_TRACER
753 extern int enable_branch_tracing(struct trace_array *tr);
754 extern void disable_branch_tracing(void);
755 static inline int trace_branch_enable(struct trace_array *tr)
756 {
757         if (trace_flags & TRACE_ITER_BRANCH)
758                 return enable_branch_tracing(tr);
759         return 0;
760 }
761 static inline void trace_branch_disable(void)
762 {
763         /* due to races, always disable */
764         disable_branch_tracing();
765 }
766 #else
767 static inline int trace_branch_enable(struct trace_array *tr)
768 {
769         return 0;
770 }
771 static inline void trace_branch_disable(void)
772 {
773 }
774 #endif /* CONFIG_BRANCH_TRACER */
775
776 /* set ring buffers to default size if not already done so */
777 int tracing_update_buffers(void);
778
779 /* trace event type bit fields, not numeric */
780 enum {
781         TRACE_EVENT_TYPE_PRINTF         = 1,
782         TRACE_EVENT_TYPE_RAW            = 2,
783 };
784
785 struct ftrace_event_field {
786         struct list_head        link;
787         char                    *name;
788         char                    *type;
789         int                     filter_type;
790         int                     offset;
791         int                     size;
792         int                     is_signed;
793 };
794
795 struct event_filter {
796         int                     n_preds;
797         struct filter_pred      **preds;
798         char                    *filter_string;
799         bool                    no_reset;
800 };
801
802 struct event_subsystem {
803         struct list_head        list;
804         const char              *name;
805         struct dentry           *entry;
806         struct event_filter     *filter;
807         int                     nr_events;
808 };
809
810 struct filter_pred;
811
812 typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event,
813                                  int val1, int val2);
814
815 struct filter_pred {
816         filter_pred_fn_t fn;
817         u64 val;
818         char str_val[MAX_FILTER_STR_VAL];
819         int str_len;
820         char *field_name;
821         int offset;
822         int not;
823         int op;
824         int pop_n;
825 };
826
827 extern void print_event_filter(struct ftrace_event_call *call,
828                                struct trace_seq *s);
829 extern int apply_event_filter(struct ftrace_event_call *call,
830                               char *filter_string);
831 extern int apply_subsystem_event_filter(struct event_subsystem *system,
832                                         char *filter_string);
833 extern void print_subsystem_event_filter(struct event_subsystem *system,
834                                          struct trace_seq *s);
835 extern int filter_assign_type(const char *type);
836
837 static inline int
838 filter_check_discard(struct ftrace_event_call *call, void *rec,
839                      struct ring_buffer *buffer,
840                      struct ring_buffer_event *event)
841 {
842         if (unlikely(call->filter_active) && !filter_match_preds(call, rec)) {
843                 ring_buffer_discard_commit(buffer, event);
844                 return 1;
845         }
846
847         return 0;
848 }
849
850 #define DEFINE_COMPARISON_PRED(type)                                    \
851 static int filter_pred_##type(struct filter_pred *pred, void *event,    \
852                               int val1, int val2)                       \
853 {                                                                       \
854         type *addr = (type *)(event + pred->offset);                    \
855         type val = (type)pred->val;                                     \
856         int match = 0;                                                  \
857                                                                         \
858         switch (pred->op) {                                             \
859         case OP_LT:                                                     \
860                 match = (*addr < val);                                  \
861                 break;                                                  \
862         case OP_LE:                                                     \
863                 match = (*addr <= val);                                 \
864                 break;                                                  \
865         case OP_GT:                                                     \
866                 match = (*addr > val);                                  \
867                 break;                                                  \
868         case OP_GE:                                                     \
869                 match = (*addr >= val);                                 \
870                 break;                                                  \
871         default:                                                        \
872                 break;                                                  \
873         }                                                               \
874                                                                         \
875         return match;                                                   \
876 }
877
878 #define DEFINE_EQUALITY_PRED(size)                                      \
879 static int filter_pred_##size(struct filter_pred *pred, void *event,    \
880                               int val1, int val2)                       \
881 {                                                                       \
882         u##size *addr = (u##size *)(event + pred->offset);              \
883         u##size val = (u##size)pred->val;                               \
884         int match;                                                      \
885                                                                         \
886         match = (val == *addr) ^ pred->not;                             \
887                                                                         \
888         return match;                                                   \
889 }
890
891 extern struct mutex event_mutex;
892 extern struct list_head ftrace_events;
893
894 extern const char *__start___trace_bprintk_fmt[];
895 extern const char *__stop___trace_bprintk_fmt[];
896
897 #undef TRACE_EVENT_FORMAT
898 #define TRACE_EVENT_FORMAT(call, proto, args, fmt, tstruct, tpfmt)      \
899         extern struct ftrace_event_call event_##call;
900 #undef TRACE_EVENT_FORMAT_NOFILTER
901 #define TRACE_EVENT_FORMAT_NOFILTER(call, proto, args, fmt, tstruct, tpfmt)
902 #include "trace_event_types.h"
903
904 #endif /* _LINUX_KERNEL_TRACE_H */