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trace.h
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1 #ifndef _LINUX_KERNEL_TRACE_H
2 #define _LINUX_KERNEL_TRACE_H
3 
4 #include <linux/fs.h>
5 #include <linux/atomic.h>
6 #include <linux/sched.h>
7 #include <linux/clocksource.h>
8 #include <linux/ring_buffer.h>
9 #include <linux/mmiotrace.h>
10 #include <linux/tracepoint.h>
11 #include <linux/ftrace.h>
12 #include <linux/hw_breakpoint.h>
13 #include <linux/trace_seq.h>
14 #include <linux/ftrace_event.h>
15 
16 enum trace_type {
17  __TRACE_FIRST_TYPE = 0,
18 
19  TRACE_FN,
20  TRACE_CTX,
21  TRACE_WAKE,
22  TRACE_STACK,
23  TRACE_PRINT,
24  TRACE_BPRINT,
25  TRACE_MMIO_RW,
26  TRACE_MMIO_MAP,
27  TRACE_BRANCH,
28  TRACE_GRAPH_RET,
29  TRACE_GRAPH_ENT,
30  TRACE_USER_STACK,
31  TRACE_BLK,
32 
33  __TRACE_LAST_TYPE,
34 };
35 
36 
37 #undef __field
38 #define __field(type, item) type item;
39 
40 #undef __field_struct
41 #define __field_struct(type, item) __field(type, item)
42 
43 #undef __field_desc
44 #define __field_desc(type, container, item)
45 
46 #undef __array
47 #define __array(type, item, size) type item[size];
48 
49 #undef __array_desc
50 #define __array_desc(type, container, item, size)
51 
52 #undef __dynamic_array
53 #define __dynamic_array(type, item) type item[];
54 
55 #undef F_STRUCT
56 #define F_STRUCT(args...) args
57 
58 #undef FTRACE_ENTRY
59 #define FTRACE_ENTRY(name, struct_name, id, tstruct, print, filter) \
60  struct struct_name { \
61  struct trace_entry ent; \
62  tstruct \
63  }
64 
65 #undef TP_ARGS
66 #define TP_ARGS(args...) args
67 
68 #undef FTRACE_ENTRY_DUP
69 #define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk, filter)
70 
71 #undef FTRACE_ENTRY_REG
72 #define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, \
73  filter, regfn) \
74  FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \
75  filter)
76 
77 #include "trace_entries.h"
78 
79 /*
80  * syscalls are special, and need special handling, this is why
81  * they are not included in trace_entries.h
82  */
83 struct syscall_trace_enter {
84  struct trace_entry ent;
85  int nr;
86  unsigned long args[];
87 };
88 
89 struct syscall_trace_exit {
90  struct trace_entry ent;
91  int nr;
92  long ret;
93 };
94 
95 struct kprobe_trace_entry_head {
96  struct trace_entry ent;
97  unsigned long ip;
98 };
99 
100 struct kretprobe_trace_entry_head {
101  struct trace_entry ent;
102  unsigned long func;
103  unsigned long ret_ip;
104 };
105 
106 struct uprobe_trace_entry_head {
107  struct trace_entry ent;
108  unsigned long ip;
109 };
110 
111 /*
112  * trace_flag_type is an enumeration that holds different
113  * states when a trace occurs. These are:
114  * IRQS_OFF - interrupts were disabled
115  * IRQS_NOSUPPORT - arch does not support irqs_disabled_flags
116  * NEED_RESCHED - reschedule is requested
117  * HARDIRQ - inside an interrupt handler
118  * SOFTIRQ - inside a softirq handler
119  */
120 enum trace_flag_type {
121  TRACE_FLAG_IRQS_OFF = 0x01,
122  TRACE_FLAG_IRQS_NOSUPPORT = 0x02,
123  TRACE_FLAG_NEED_RESCHED = 0x04,
124  TRACE_FLAG_HARDIRQ = 0x08,
125  TRACE_FLAG_SOFTIRQ = 0x10,
126 };
127 
128 #define TRACE_BUF_SIZE 1024
129 
130 /*
131  * The CPU trace array - it consists of thousands of trace entries
132  * plus some other descriptor data: (for example which task started
133  * the trace, etc.)
134  */
135 struct trace_array_cpu {
136  atomic_t disabled;
137  void *buffer_page; /* ring buffer spare */
138 
139  unsigned long entries;
140  unsigned long saved_latency;
141  unsigned long critical_start;
142  unsigned long critical_end;
143  unsigned long critical_sequence;
144  unsigned long nice;
145  unsigned long policy;
146  unsigned long rt_priority;
147  unsigned long skipped_entries;
148  cycle_t preempt_timestamp;
149  pid_t pid;
150  kuid_t uid;
151  char comm[TASK_COMM_LEN];
152 };
153 
154 /*
155  * The trace array - an array of per-CPU trace arrays. This is the
156  * highest level data structure that individual tracers deal with.
157  * They have on/off state as well:
158  */
159 struct trace_array {
160  struct ring_buffer *buffer;
161  int cpu;
162  int buffer_disabled;
163  cycle_t time_start;
164  struct task_struct *waiter;
165  struct trace_array_cpu *data[NR_CPUS];
166 };
167 
168 #define FTRACE_CMP_TYPE(var, type) \
169  __builtin_types_compatible_p(typeof(var), type *)
170 
171 #undef IF_ASSIGN
172 #define IF_ASSIGN(var, entry, etype, id) \
173  if (FTRACE_CMP_TYPE(var, etype)) { \
174  var = (typeof(var))(entry); \
175  WARN_ON(id && (entry)->type != id); \
176  break; \
177  }
178 
179 /* Will cause compile errors if type is not found. */
180 extern void __ftrace_bad_type(void);
181 
182 /*
183  * The trace_assign_type is a verifier that the entry type is
184  * the same as the type being assigned. To add new types simply
185  * add a line with the following format:
186  *
187  * IF_ASSIGN(var, ent, type, id);
188  *
189  * Where "type" is the trace type that includes the trace_entry
190  * as the "ent" item. And "id" is the trace identifier that is
191  * used in the trace_type enum.
192  *
193  * If the type can have more than one id, then use zero.
194  */
195 #define trace_assign_type(var, ent) \
196  do { \
197  IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \
198  IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \
199  IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \
200  IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\
201  IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \
202  IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \
203  IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \
204  TRACE_MMIO_RW); \
205  IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \
206  TRACE_MMIO_MAP); \
207  IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \
208  IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \
209  TRACE_GRAPH_ENT); \
210  IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \
211  TRACE_GRAPH_RET); \
212  __ftrace_bad_type(); \
213  } while (0)
214 
215 /*
216  * An option specific to a tracer. This is a boolean value.
217  * The bit is the bit index that sets its value on the
218  * flags value in struct tracer_flags.
219  */
220 struct tracer_opt {
221  const char *name; /* Will appear on the trace_options file */
222  u32 bit; /* Mask assigned in val field in tracer_flags */
223 };
224 
225 /*
226  * The set of specific options for a tracer. Your tracer
227  * have to set the initial value of the flags val.
228  */
229 struct tracer_flags {
230  u32 val;
231  struct tracer_opt *opts;
232 };
233 
234 /* Makes more easy to define a tracer opt */
235 #define TRACER_OPT(s, b) .name = #s, .bit = b
236 
237 
258 struct tracer {
259  const char *name;
260  int (*init)(struct trace_array *tr);
261  void (*reset)(struct trace_array *tr);
262  void (*start)(struct trace_array *tr);
263  void (*stop)(struct trace_array *tr);
264  void (*open)(struct trace_iterator *iter);
265  void (*pipe_open)(struct trace_iterator *iter);
266  void (*wait_pipe)(struct trace_iterator *iter);
267  void (*close)(struct trace_iterator *iter);
268  void (*pipe_close)(struct trace_iterator *iter);
269  ssize_t (*read)(struct trace_iterator *iter,
270  struct file *filp, char __user *ubuf,
271  size_t cnt, loff_t *ppos);
272  ssize_t (*splice_read)(struct trace_iterator *iter,
273  struct file *filp,
274  loff_t *ppos,
275  struct pipe_inode_info *pipe,
276  size_t len,
277  unsigned int flags);
278 #ifdef CONFIG_FTRACE_STARTUP_TEST
279  int (*selftest)(struct tracer *trace,
280  struct trace_array *tr);
281 #endif
282  void (*print_header)(struct seq_file *m);
283  enum print_line_t (*print_line)(struct trace_iterator *iter);
284  /* If you handled the flag setting, return 0 */
285  int (*set_flag)(u32 old_flags, u32 bit, int set);
286  struct tracer *next;
287  struct tracer_flags *flags;
288  int print_max;
289  int use_max_tr;
290 };
291 
292 
293 /* Only current can touch trace_recursion */
294 #define trace_recursion_inc() do { (current)->trace_recursion++; } while (0)
295 #define trace_recursion_dec() do { (current)->trace_recursion--; } while (0)
296 
297 /* Ring buffer has the 10 LSB bits to count */
298 #define trace_recursion_buffer() ((current)->trace_recursion & 0x3ff)
299 
300 /* for function tracing recursion */
301 #define TRACE_INTERNAL_BIT (1<<11)
302 #define TRACE_GLOBAL_BIT (1<<12)
303 #define TRACE_CONTROL_BIT (1<<13)
304 
305 /*
306  * Abuse of the trace_recursion.
307  * As we need a way to maintain state if we are tracing the function
308  * graph in irq because we want to trace a particular function that
309  * was called in irq context but we have irq tracing off. Since this
310  * can only be modified by current, we can reuse trace_recursion.
311  */
312 #define TRACE_IRQ_BIT (1<<13)
313 
314 #define trace_recursion_set(bit) do { (current)->trace_recursion |= (bit); } while (0)
315 #define trace_recursion_clear(bit) do { (current)->trace_recursion &= ~(bit); } while (0)
316 #define trace_recursion_test(bit) ((current)->trace_recursion & (bit))
317 
318 #define TRACE_PIPE_ALL_CPU -1
319 
320 static inline struct ring_buffer_iter *
321 trace_buffer_iter(struct trace_iterator *iter, int cpu)
322 {
323  if (iter->buffer_iter && iter->buffer_iter[cpu])
324  return iter->buffer_iter[cpu];
325  return NULL;
326 }
327 
328 int tracer_init(struct tracer *t, struct trace_array *tr);
329 int tracing_is_enabled(void);
330 void trace_wake_up(void);
331 void tracing_reset(struct trace_array *tr, int cpu);
332 void tracing_reset_online_cpus(struct trace_array *tr);
333 void tracing_reset_current(int cpu);
334 void tracing_reset_current_online_cpus(void);
335 int tracing_open_generic(struct inode *inode, struct file *filp);
336 struct dentry *trace_create_file(const char *name,
337  umode_t mode,
338  struct dentry *parent,
339  void *data,
340  const struct file_operations *fops);
341 
342 struct dentry *tracing_init_dentry(void);
343 
344 struct ring_buffer_event;
345 
346 struct ring_buffer_event *
347 trace_buffer_lock_reserve(struct ring_buffer *buffer,
348  int type,
349  unsigned long len,
350  unsigned long flags,
351  int pc);
352 void trace_buffer_unlock_commit(struct ring_buffer *buffer,
353  struct ring_buffer_event *event,
354  unsigned long flags, int pc);
355 
356 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,
357  struct trace_array_cpu *data);
358 
359 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter,
360  int *ent_cpu, u64 *ent_ts);
361 
362 int trace_empty(struct trace_iterator *iter);
363 
364 void *trace_find_next_entry_inc(struct trace_iterator *iter);
365 
366 void trace_init_global_iter(struct trace_iterator *iter);
367 
368 void tracing_iter_reset(struct trace_iterator *iter, int cpu);
369 
370 void default_wait_pipe(struct trace_iterator *iter);
371 void poll_wait_pipe(struct trace_iterator *iter);
372 
373 void ftrace(struct trace_array *tr,
374  struct trace_array_cpu *data,
375  unsigned long ip,
376  unsigned long parent_ip,
377  unsigned long flags, int pc);
378 void tracing_sched_switch_trace(struct trace_array *tr,
379  struct task_struct *prev,
380  struct task_struct *next,
381  unsigned long flags, int pc);
382 
383 void tracing_sched_wakeup_trace(struct trace_array *tr,
384  struct task_struct *wakee,
385  struct task_struct *cur,
386  unsigned long flags, int pc);
387 void trace_function(struct trace_array *tr,
388  unsigned long ip,
389  unsigned long parent_ip,
390  unsigned long flags, int pc);
391 void trace_graph_function(struct trace_array *tr,
392  unsigned long ip,
393  unsigned long parent_ip,
394  unsigned long flags, int pc);
395 void trace_latency_header(struct seq_file *m);
396 void trace_default_header(struct seq_file *m);
397 void print_trace_header(struct seq_file *m, struct trace_iterator *iter);
398 int trace_empty(struct trace_iterator *iter);
399 
400 void trace_graph_return(struct ftrace_graph_ret *trace);
401 int trace_graph_entry(struct ftrace_graph_ent *trace);
402 void set_graph_array(struct trace_array *tr);
403 
404 void tracing_start_cmdline_record(void);
405 void tracing_stop_cmdline_record(void);
406 void tracing_sched_switch_assign_trace(struct trace_array *tr);
407 void tracing_stop_sched_switch_record(void);
408 void tracing_start_sched_switch_record(void);
409 int register_tracer(struct tracer *type);
410 void unregister_tracer(struct tracer *type);
411 int is_tracing_stopped(void);
412 enum trace_file_type {
413  TRACE_FILE_LAT_FMT = 1,
414  TRACE_FILE_ANNOTATE = 2,
415 };
416 
417 extern cpumask_var_t __read_mostly tracing_buffer_mask;
418 
419 #define for_each_tracing_cpu(cpu) \
420  for_each_cpu(cpu, tracing_buffer_mask)
421 
422 extern unsigned long nsecs_to_usecs(unsigned long nsecs);
423 
424 extern unsigned long tracing_thresh;
425 
426 #ifdef CONFIG_TRACER_MAX_TRACE
427 extern unsigned long tracing_max_latency;
428 
429 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu);
430 void update_max_tr_single(struct trace_array *tr,
431  struct task_struct *tsk, int cpu);
432 #endif /* CONFIG_TRACER_MAX_TRACE */
433 
434 #ifdef CONFIG_STACKTRACE
435 void ftrace_trace_stack(struct ring_buffer *buffer, unsigned long flags,
436  int skip, int pc);
437 
438 void ftrace_trace_stack_regs(struct ring_buffer *buffer, unsigned long flags,
439  int skip, int pc, struct pt_regs *regs);
440 
441 void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags,
442  int pc);
443 
444 void __trace_stack(struct trace_array *tr, unsigned long flags, int skip,
445  int pc);
446 #else
447 static inline void ftrace_trace_stack(struct ring_buffer *buffer,
448  unsigned long flags, int skip, int pc)
449 {
450 }
451 
452 static inline void ftrace_trace_stack_regs(struct ring_buffer *buffer,
453  unsigned long flags, int skip,
454  int pc, struct pt_regs *regs)
455 {
456 }
457 
458 static inline void ftrace_trace_userstack(struct ring_buffer *buffer,
459  unsigned long flags, int pc)
460 {
461 }
462 
463 static inline void __trace_stack(struct trace_array *tr, unsigned long flags,
464  int skip, int pc)
465 {
466 }
467 #endif /* CONFIG_STACKTRACE */
468 
469 extern cycle_t ftrace_now(int cpu);
470 
471 extern void trace_find_cmdline(int pid, char comm[]);
472 
473 #ifdef CONFIG_DYNAMIC_FTRACE
474 extern unsigned long ftrace_update_tot_cnt;
475 #endif
476 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
477 extern int DYN_FTRACE_TEST_NAME(void);
478 #define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2
479 extern int DYN_FTRACE_TEST_NAME2(void);
480 
481 extern int ring_buffer_expanded;
482 extern bool tracing_selftest_disabled;
483 DECLARE_PER_CPU(int, ftrace_cpu_disabled);
484 
485 #ifdef CONFIG_FTRACE_STARTUP_TEST
486 extern int trace_selftest_startup_function(struct tracer *trace,
487  struct trace_array *tr);
488 extern int trace_selftest_startup_function_graph(struct tracer *trace,
489  struct trace_array *tr);
490 extern int trace_selftest_startup_irqsoff(struct tracer *trace,
491  struct trace_array *tr);
492 extern int trace_selftest_startup_preemptoff(struct tracer *trace,
493  struct trace_array *tr);
494 extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace,
495  struct trace_array *tr);
496 extern int trace_selftest_startup_wakeup(struct tracer *trace,
497  struct trace_array *tr);
498 extern int trace_selftest_startup_nop(struct tracer *trace,
499  struct trace_array *tr);
500 extern int trace_selftest_startup_sched_switch(struct tracer *trace,
501  struct trace_array *tr);
502 extern int trace_selftest_startup_branch(struct tracer *trace,
503  struct trace_array *tr);
504 #endif /* CONFIG_FTRACE_STARTUP_TEST */
505 
506 extern void *head_page(struct trace_array_cpu *data);
507 extern unsigned long long ns2usecs(cycle_t nsec);
508 extern int
509 trace_vbprintk(unsigned long ip, const char *fmt, va_list args);
510 extern int
511 trace_vprintk(unsigned long ip, const char *fmt, va_list args);
512 extern int
513 trace_array_vprintk(struct trace_array *tr,
514  unsigned long ip, const char *fmt, va_list args);
515 int trace_array_printk(struct trace_array *tr,
516  unsigned long ip, const char *fmt, ...);
517 void trace_printk_seq(struct trace_seq *s);
518 enum print_line_t print_trace_line(struct trace_iterator *iter);
519 
520 extern unsigned long trace_flags;
521 
522 extern int trace_clock_id;
523 
524 /* Standard output formatting function used for function return traces */
525 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
526 
527 /* Flag options */
528 #define TRACE_GRAPH_PRINT_OVERRUN 0x1
529 #define TRACE_GRAPH_PRINT_CPU 0x2
530 #define TRACE_GRAPH_PRINT_OVERHEAD 0x4
531 #define TRACE_GRAPH_PRINT_PROC 0x8
532 #define TRACE_GRAPH_PRINT_DURATION 0x10
533 #define TRACE_GRAPH_PRINT_ABS_TIME 0x20
534 
535 extern enum print_line_t
536 print_graph_function_flags(struct trace_iterator *iter, u32 flags);
537 extern void print_graph_headers_flags(struct seq_file *s, u32 flags);
538 extern enum print_line_t
539 trace_print_graph_duration(unsigned long long duration, struct trace_seq *s);
540 extern void graph_trace_open(struct trace_iterator *iter);
541 extern void graph_trace_close(struct trace_iterator *iter);
542 extern int __trace_graph_entry(struct trace_array *tr,
543  struct ftrace_graph_ent *trace,
544  unsigned long flags, int pc);
545 extern void __trace_graph_return(struct trace_array *tr,
546  struct ftrace_graph_ret *trace,
547  unsigned long flags, int pc);
548 
549 
550 #ifdef CONFIG_DYNAMIC_FTRACE
551 /* TODO: make this variable */
552 #define FTRACE_GRAPH_MAX_FUNCS 32
553 extern int ftrace_graph_filter_enabled;
554 extern int ftrace_graph_count;
555 extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS];
556 
557 static inline int ftrace_graph_addr(unsigned long addr)
558 {
559  int i;
560 
561  if (!ftrace_graph_filter_enabled)
562  return 1;
563 
564  for (i = 0; i < ftrace_graph_count; i++) {
565  if (addr == ftrace_graph_funcs[i]) {
566  /*
567  * If no irqs are to be traced, but a set_graph_function
568  * is set, and called by an interrupt handler, we still
569  * want to trace it.
570  */
571  if (in_irq())
572  trace_recursion_set(TRACE_IRQ_BIT);
573  else
574  trace_recursion_clear(TRACE_IRQ_BIT);
575  return 1;
576  }
577  }
578 
579  return 0;
580 }
581 #else
582 static inline int ftrace_graph_addr(unsigned long addr)
583 {
584  return 1;
585 }
586 #endif /* CONFIG_DYNAMIC_FTRACE */
587 #else /* CONFIG_FUNCTION_GRAPH_TRACER */
588 static inline enum print_line_t
589 print_graph_function_flags(struct trace_iterator *iter, u32 flags)
590 {
591  return TRACE_TYPE_UNHANDLED;
592 }
593 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
594 
595 extern struct list_head ftrace_pids;
596 
597 #ifdef CONFIG_FUNCTION_TRACER
598 static inline int ftrace_trace_task(struct task_struct *task)
599 {
600  if (list_empty(&ftrace_pids))
601  return 1;
602 
603  return test_tsk_trace_trace(task);
604 }
605 extern int ftrace_is_dead(void);
606 #else
607 static inline int ftrace_trace_task(struct task_struct *task)
608 {
609  return 1;
610 }
611 static inline int ftrace_is_dead(void) { return 0; }
612 #endif
613 
614 int ftrace_event_is_function(struct ftrace_event_call *call);
615 
616 /*
617  * struct trace_parser - servers for reading the user input separated by spaces
618  * @cont: set if the input is not complete - no final space char was found
619  * @buffer: holds the parsed user input
620  * @idx: user input length
621  * @size: buffer size
622  */
623 struct trace_parser {
624  bool cont;
625  char *buffer;
626  unsigned idx;
627  unsigned size;
628 };
629 
630 static inline bool trace_parser_loaded(struct trace_parser *parser)
631 {
632  return (parser->idx != 0);
633 }
634 
635 static inline bool trace_parser_cont(struct trace_parser *parser)
636 {
637  return parser->cont;
638 }
639 
640 static inline void trace_parser_clear(struct trace_parser *parser)
641 {
642  parser->cont = false;
643  parser->idx = 0;
644 }
645 
646 extern int trace_parser_get_init(struct trace_parser *parser, int size);
647 extern void trace_parser_put(struct trace_parser *parser);
648 extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
649  size_t cnt, loff_t *ppos);
650 
651 /*
652  * trace_iterator_flags is an enumeration that defines bit
653  * positions into trace_flags that controls the output.
654  *
655  * NOTE: These bits must match the trace_options array in
656  * trace.c.
657  */
658 enum trace_iterator_flags {
659  TRACE_ITER_PRINT_PARENT = 0x01,
660  TRACE_ITER_SYM_OFFSET = 0x02,
661  TRACE_ITER_SYM_ADDR = 0x04,
662  TRACE_ITER_VERBOSE = 0x08,
663  TRACE_ITER_RAW = 0x10,
664  TRACE_ITER_HEX = 0x20,
665  TRACE_ITER_BIN = 0x40,
666  TRACE_ITER_BLOCK = 0x80,
667  TRACE_ITER_STACKTRACE = 0x100,
668  TRACE_ITER_PRINTK = 0x200,
669  TRACE_ITER_PREEMPTONLY = 0x400,
670  TRACE_ITER_BRANCH = 0x800,
671  TRACE_ITER_ANNOTATE = 0x1000,
672  TRACE_ITER_USERSTACKTRACE = 0x2000,
673  TRACE_ITER_SYM_USEROBJ = 0x4000,
674  TRACE_ITER_PRINTK_MSGONLY = 0x8000,
675  TRACE_ITER_CONTEXT_INFO = 0x10000, /* Print pid/cpu/time */
676  TRACE_ITER_LATENCY_FMT = 0x20000,
677  TRACE_ITER_SLEEP_TIME = 0x40000,
678  TRACE_ITER_GRAPH_TIME = 0x80000,
679  TRACE_ITER_RECORD_CMD = 0x100000,
680  TRACE_ITER_OVERWRITE = 0x200000,
681  TRACE_ITER_STOP_ON_FREE = 0x400000,
682  TRACE_ITER_IRQ_INFO = 0x800000,
683  TRACE_ITER_MARKERS = 0x1000000,
684 };
685 
686 /*
687  * TRACE_ITER_SYM_MASK masks the options in trace_flags that
688  * control the output of kernel symbols.
689  */
690 #define TRACE_ITER_SYM_MASK \
691  (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR)
692 
693 extern struct tracer nop_trace;
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; /* Number assigned */
740  int a_preds; /* allocated */
741  struct filter_pred *preds;
742  struct filter_pred *root;
743  char *filter_string;
744 };
745 
746 struct event_subsystem {
747  struct list_head list;
748  const char *name;
749  struct dentry *entry;
750  struct event_filter *filter;
751  int nr_events;
752  int ref_count;
753 };
754 
755 #define FILTER_PRED_INVALID ((unsigned short)-1)
756 #define FILTER_PRED_IS_RIGHT (1 << 15)
757 #define FILTER_PRED_FOLD (1 << 15)
758 
759 /*
760  * The max preds is the size of unsigned short with
761  * two flags at the MSBs. One bit is used for both the IS_RIGHT
762  * and FOLD flags. The other is reserved.
763  *
764  * 2^14 preds is way more than enough.
765  */
766 #define MAX_FILTER_PRED 16384
767 
768 struct filter_pred;
769 struct regex;
770 
771 typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event);
772 
773 typedef int (*regex_match_func)(char *str, struct regex *r, int len);
774 
775 enum regex_type {
776  MATCH_FULL = 0,
777  MATCH_FRONT_ONLY,
778  MATCH_MIDDLE_ONLY,
779  MATCH_END_ONLY,
780 };
781 
782 struct regex {
783  char pattern[MAX_FILTER_STR_VAL];
784  int len;
785  int field_len;
786  regex_match_func match;
787 };
788 
789 struct filter_pred {
790  filter_pred_fn_t fn;
791  u64 val;
792  struct regex regex;
793  unsigned short *ops;
794  struct ftrace_event_field *field;
795  int offset;
796  int not;
797  int op;
798  unsigned short index;
799  unsigned short parent;
800  unsigned short left;
801  unsigned short right;
802 };
803 
804 extern struct list_head ftrace_common_fields;
805 
806 extern enum regex_type
807 filter_parse_regex(char *buff, int len, char **search, int *not);
808 extern void print_event_filter(struct ftrace_event_call *call,
809  struct trace_seq *s);
810 extern int apply_event_filter(struct ftrace_event_call *call,
811  char *filter_string);
812 extern int apply_subsystem_event_filter(struct event_subsystem *system,
813  char *filter_string);
814 extern void print_subsystem_event_filter(struct event_subsystem *system,
815  struct trace_seq *s);
816 extern int filter_assign_type(const char *type);
817 
818 struct list_head *
819 trace_get_fields(struct ftrace_event_call *event_call);
820 
821 static inline int
822 filter_check_discard(struct ftrace_event_call *call, void *rec,
823  struct ring_buffer *buffer,
824  struct ring_buffer_event *event)
825 {
826  if (unlikely(call->flags & TRACE_EVENT_FL_FILTERED) &&
827  !filter_match_preds(call->filter, rec)) {
828  ring_buffer_discard_commit(buffer, event);
829  return 1;
830  }
831 
832  return 0;
833 }
834 
835 extern void trace_event_enable_cmd_record(bool enable);
836 
837 extern struct mutex event_mutex;
838 extern struct list_head ftrace_events;
839 
840 extern const char *__start___trace_bprintk_fmt[];
841 extern const char *__stop___trace_bprintk_fmt[];
842 
843 void trace_printk_init_buffers(void);
844 
845 #undef FTRACE_ENTRY
846 #define FTRACE_ENTRY(call, struct_name, id, tstruct, print, filter) \
847  extern struct ftrace_event_call \
848  __attribute__((__aligned__(4))) event_##call;
849 #undef FTRACE_ENTRY_DUP
850 #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print, filter) \
851  FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \
852  filter)
853 #include "trace_entries.h"
854 
855 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER)
856 int perf_ftrace_event_register(struct ftrace_event_call *call,
857  enum trace_reg type, void *data);
858 #else
859 #define perf_ftrace_event_register NULL
860 #endif
861 
862 #endif /* _LINUX_KERNEL_TRACE_H */
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