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TOMOYO Linux Cross Reference
Linux/kernel/trace/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 <asm/atomic.h>
  6 #include <linux/sched.h>
  7 #include <linux/clocksource.h>
  8 #include <linux/ring_buffer.h>
  9 #include <linux/mmiotrace.h>
 10 #include <linux/tracepoint.h>
 11 #include <linux/ftrace.h>
 12 #include <linux/hw_breakpoint.h>
 13 #include <linux/trace_seq.h>
 14 #include <linux/ftrace_event.h>
 15 
 16 enum trace_type {
 17         __TRACE_FIRST_TYPE = 0,
 18 
 19         TRACE_FN,
 20         TRACE_CTX,
 21         TRACE_WAKE,
 22         TRACE_STACK,
 23         TRACE_PRINT,
 24         TRACE_BPRINT,
 25         TRACE_MMIO_RW,
 26         TRACE_MMIO_MAP,
 27         TRACE_BRANCH,
 28         TRACE_GRAPH_RET,
 29         TRACE_GRAPH_ENT,
 30         TRACE_USER_STACK,
 31         TRACE_BLK,
 32 
 33         __TRACE_LAST_TYPE,
 34 };
 35 
 36 
 37 #undef __field
 38 #define __field(type, item)             type    item;
 39 
 40 #undef __field_struct
 41 #define __field_struct(type, item)      __field(type, item)
 42 
 43 #undef __field_desc
 44 #define __field_desc(type, container, item)
 45 
 46 #undef __array
 47 #define __array(type, item, size)       type    item[size];
 48 
 49 #undef __array_desc
 50 #define __array_desc(type, container, item, size)
 51 
 52 #undef __dynamic_array
 53 #define __dynamic_array(type, item)     type    item[];
 54 
 55 #undef F_STRUCT
 56 #define F_STRUCT(args...)               args
 57 
 58 #undef FTRACE_ENTRY
 59 #define FTRACE_ENTRY(name, struct_name, id, tstruct, print)     \
 60         struct struct_name {                                    \
 61                 struct trace_entry      ent;                    \
 62                 tstruct                                         \
 63         }
 64 
 65 #undef TP_ARGS
 66 #define TP_ARGS(args...)        args
 67 
 68 #undef FTRACE_ENTRY_DUP
 69 #define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk)
 70 
 71 #include "trace_entries.h"
 72 
 73 /*
 74  * syscalls are special, and need special handling, this is why
 75  * they are not included in trace_entries.h
 76  */
 77 struct syscall_trace_enter {
 78         struct trace_entry      ent;
 79         int                     nr;
 80         unsigned long           args[];
 81 };
 82 
 83 struct syscall_trace_exit {
 84         struct trace_entry      ent;
 85         int                     nr;
 86         long                    ret;
 87 };
 88 
 89 struct kprobe_trace_entry_head {
 90         struct trace_entry      ent;
 91         unsigned long           ip;
 92 };
 93 
 94 struct kretprobe_trace_entry_head {
 95         struct trace_entry      ent;
 96         unsigned long           func;
 97         unsigned long           ret_ip;
 98 };
 99 
100 /*
101  * trace_flag_type is an enumeration that holds different
102  * states when a trace occurs. These are:
103  *  IRQS_OFF            - interrupts were disabled
104  *  IRQS_NOSUPPORT      - arch does not support irqs_disabled_flags
105  *  NEED_RESCHED        - reschedule is requested
106  *  HARDIRQ             - inside an interrupt handler
107  *  SOFTIRQ             - inside a softirq handler
108  */
109 enum trace_flag_type {
110         TRACE_FLAG_IRQS_OFF             = 0x01,
111         TRACE_FLAG_IRQS_NOSUPPORT       = 0x02,
112         TRACE_FLAG_NEED_RESCHED         = 0x04,
113         TRACE_FLAG_HARDIRQ              = 0x08,
114         TRACE_FLAG_SOFTIRQ              = 0x10,
115 };
116 
117 #define TRACE_BUF_SIZE          1024
118 
119 /*
120  * The CPU trace array - it consists of thousands of trace entries
121  * plus some other descriptor data: (for example which task started
122  * the trace, etc.)
123  */
124 struct trace_array_cpu {
125         atomic_t                disabled;
126         void                    *buffer_page;   /* ring buffer spare */
127 
128         unsigned long           saved_latency;
129         unsigned long           critical_start;
130         unsigned long           critical_end;
131         unsigned long           critical_sequence;
132         unsigned long           nice;
133         unsigned long           policy;
134         unsigned long           rt_priority;
135         unsigned long           skipped_entries;
136         cycle_t                 preempt_timestamp;
137         pid_t                   pid;
138         uid_t                   uid;
139         char                    comm[TASK_COMM_LEN];
140 };
141 
142 /*
143  * The trace array - an array of per-CPU trace arrays. This is the
144  * highest level data structure that individual tracers deal with.
145  * They have on/off state as well:
146  */
147 struct trace_array {
148         struct ring_buffer      *buffer;
149         unsigned long           entries;
150         int                     cpu;
151         cycle_t                 time_start;
152         struct task_struct      *waiter;
153         struct trace_array_cpu  *data[NR_CPUS];
154 };
155 
156 #define FTRACE_CMP_TYPE(var, type) \
157         __builtin_types_compatible_p(typeof(var), type *)
158 
159 #undef IF_ASSIGN
160 #define IF_ASSIGN(var, entry, etype, id)                \
161         if (FTRACE_CMP_TYPE(var, etype)) {              \
162                 var = (typeof(var))(entry);             \
163                 WARN_ON(id && (entry)->type != id);     \
164                 break;                                  \
165         }
166 
167 /* Will cause compile errors if type is not found. */
168 extern void __ftrace_bad_type(void);
169 
170 /*
171  * The trace_assign_type is a verifier that the entry type is
172  * the same as the type being assigned. To add new types simply
173  * add a line with the following format:
174  *
175  * IF_ASSIGN(var, ent, type, id);
176  *
177  *  Where "type" is the trace type that includes the trace_entry
178  *  as the "ent" item. And "id" is the trace identifier that is
179  *  used in the trace_type enum.
180  *
181  *  If the type can have more than one id, then use zero.
182  */
183 #define trace_assign_type(var, ent)                                     \
184         do {                                                            \
185                 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN);     \
186                 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0);        \
187                 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK);   \
188                 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\
189                 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT);   \
190                 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \
191                 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw,          \
192                           TRACE_MMIO_RW);                               \
193                 IF_ASSIGN(var, ent, struct trace_mmiotrace_map,         \
194                           TRACE_MMIO_MAP);                              \
195                 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \
196                 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry,      \
197                           TRACE_GRAPH_ENT);             \
198                 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry,      \
199                           TRACE_GRAPH_RET);             \
200                 __ftrace_bad_type();                                    \
201         } while (0)
202 
203 /*
204  * An option specific to a tracer. This is a boolean value.
205  * The bit is the bit index that sets its value on the
206  * flags value in struct tracer_flags.
207  */
208 struct tracer_opt {
209         const char      *name; /* Will appear on the trace_options file */
210         u32             bit; /* Mask assigned in val field in tracer_flags */
211 };
212 
213 /*
214  * The set of specific options for a tracer. Your tracer
215  * have to set the initial value of the flags val.
216  */
217 struct tracer_flags {
218         u32                     val;
219         struct tracer_opt       *opts;
220 };
221 
222 /* Makes more easy to define a tracer opt */
223 #define TRACER_OPT(s, b)        .name = #s, .bit = b
224 
225 
226 /**
227  * struct tracer - a specific tracer and its callbacks to interact with debugfs
228  * @name: the name chosen to select it on the available_tracers file
229  * @init: called when one switches to this tracer (echo name > current_tracer)
230  * @reset: called when one switches to another tracer
231  * @start: called when tracing is unpaused (echo 1 > tracing_enabled)
232  * @stop: called when tracing is paused (echo 0 > tracing_enabled)
233  * @open: called when the trace file is opened
234  * @pipe_open: called when the trace_pipe file is opened
235  * @wait_pipe: override how the user waits for traces on trace_pipe
236  * @close: called when the trace file is released
237  * @pipe_close: called when the trace_pipe file is released
238  * @read: override the default read callback on trace_pipe
239  * @splice_read: override the default splice_read callback on trace_pipe
240  * @selftest: selftest to run on boot (see trace_selftest.c)
241  * @print_headers: override the first lines that describe your columns
242  * @print_line: callback that prints a trace
243  * @set_flag: signals one of your private flags changed (trace_options file)
244  * @flags: your private flags
245  */
246 struct tracer {
247         const char              *name;
248         int                     (*init)(struct trace_array *tr);
249         void                    (*reset)(struct trace_array *tr);
250         void                    (*start)(struct trace_array *tr);
251         void                    (*stop)(struct trace_array *tr);
252         void                    (*open)(struct trace_iterator *iter);
253         void                    (*pipe_open)(struct trace_iterator *iter);
254         void                    (*wait_pipe)(struct trace_iterator *iter);
255         void                    (*close)(struct trace_iterator *iter);
256         void                    (*pipe_close)(struct trace_iterator *iter);
257         ssize_t                 (*read)(struct trace_iterator *iter,
258                                         struct file *filp, char __user *ubuf,
259                                         size_t cnt, loff_t *ppos);
260         ssize_t                 (*splice_read)(struct trace_iterator *iter,
261                                                struct file *filp,
262                                                loff_t *ppos,
263                                                struct pipe_inode_info *pipe,
264                                                size_t len,
265                                                unsigned int flags);
266 #ifdef CONFIG_FTRACE_STARTUP_TEST
267         int                     (*selftest)(struct tracer *trace,
268                                             struct trace_array *tr);
269 #endif
270         void                    (*print_header)(struct seq_file *m);
271         enum print_line_t       (*print_line)(struct trace_iterator *iter);
272         /* If you handled the flag setting, return 0 */
273         int                     (*set_flag)(u32 old_flags, u32 bit, int set);
274         /* Return 0 if OK with change, else return non-zero */
275         int                     (*flag_changed)(struct tracer *tracer,
276                                                 u32 mask, int set);
277         struct tracer           *next;
278         struct tracer_flags     *flags;
279         int                     print_max;
280         int                     use_max_tr;
281         bool                    enabled;
282 };
283 
284 
285 #define TRACE_PIPE_ALL_CPU      -1
286 
287 int tracer_init(struct tracer *t, struct trace_array *tr);
288 int tracing_is_enabled(void);
289 void trace_wake_up(void);
290 void tracing_reset(struct trace_array *tr, int cpu);
291 void tracing_reset_online_cpus(struct trace_array *tr);
292 void tracing_reset_current(int cpu);
293 void tracing_reset_current_online_cpus(void);
294 int tracing_open_generic(struct inode *inode, struct file *filp);
295 struct dentry *trace_create_file(const char *name,
296                                  mode_t mode,
297                                  struct dentry *parent,
298                                  void *data,
299                                  const struct file_operations *fops);
300 
301 struct dentry *tracing_init_dentry(void);
302 
303 struct ring_buffer_event;
304 
305 struct ring_buffer_event *
306 trace_buffer_lock_reserve(struct ring_buffer *buffer,
307                           int type,
308                           unsigned long len,
309                           unsigned long flags,
310                           int pc);
311 void trace_buffer_unlock_commit(struct ring_buffer *buffer,
312                                 struct ring_buffer_event *event,
313                                 unsigned long flags, int pc);
314 
315 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,
316                                                 struct trace_array_cpu *data);
317 
318 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter,
319                                           int *ent_cpu, u64 *ent_ts);
320 
321 int trace_empty(struct trace_iterator *iter);
322 
323 void *trace_find_next_entry_inc(struct trace_iterator *iter);
324 
325 void trace_init_global_iter(struct trace_iterator *iter);
326 
327 void tracing_iter_reset(struct trace_iterator *iter, int cpu);
328 
329 void default_wait_pipe(struct trace_iterator *iter);
330 void poll_wait_pipe(struct trace_iterator *iter);
331 
332 void ftrace(struct trace_array *tr,
333                             struct trace_array_cpu *data,
334                             unsigned long ip,
335                             unsigned long parent_ip,
336                             unsigned long flags, int pc);
337 void tracing_sched_switch_trace(struct trace_array *tr,
338                                 struct task_struct *prev,
339                                 struct task_struct *next,
340                                 unsigned long flags, int pc);
341 
342 void tracing_sched_wakeup_trace(struct trace_array *tr,
343                                 struct task_struct *wakee,
344                                 struct task_struct *cur,
345                                 unsigned long flags, int pc);
346 void trace_function(struct trace_array *tr,
347                     unsigned long ip,
348                     unsigned long parent_ip,
349                     unsigned long flags, int pc);
350 void trace_graph_function(struct trace_array *tr,
351                     unsigned long ip,
352                     unsigned long parent_ip,
353                     unsigned long flags, int pc);
354 void trace_default_header(struct seq_file *m);
355 void print_trace_header(struct seq_file *m, struct trace_iterator *iter);
356 int trace_empty(struct trace_iterator *iter);
357 
358 void trace_graph_return(struct ftrace_graph_ret *trace);
359 int trace_graph_entry(struct ftrace_graph_ent *trace);
360 void set_graph_array(struct trace_array *tr);
361 
362 void tracing_start_cmdline_record(void);
363 void tracing_stop_cmdline_record(void);
364 void tracing_sched_switch_assign_trace(struct trace_array *tr);
365 void tracing_stop_sched_switch_record(void);
366 void tracing_start_sched_switch_record(void);
367 int register_tracer(struct tracer *type);
368 void unregister_tracer(struct tracer *type);
369 int is_tracing_stopped(void);
370 enum trace_file_type {
371         TRACE_FILE_LAT_FMT      = 1,
372         TRACE_FILE_ANNOTATE     = 2,
373 };
374 
375 extern cpumask_var_t __read_mostly tracing_buffer_mask;
376 
377 #define for_each_tracing_cpu(cpu)       \
378         for_each_cpu(cpu, tracing_buffer_mask)
379 
380 extern unsigned long nsecs_to_usecs(unsigned long nsecs);
381 
382 extern unsigned long tracing_thresh;
383 
384 #ifdef CONFIG_TRACER_MAX_TRACE
385 extern unsigned long tracing_max_latency;
386 
387 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu);
388 void update_max_tr_single(struct trace_array *tr,
389                           struct task_struct *tsk, int cpu);
390 #endif /* CONFIG_TRACER_MAX_TRACE */
391 
392 #ifdef CONFIG_STACKTRACE
393 void ftrace_trace_stack(struct ring_buffer *buffer, unsigned long flags,
394                         int skip, int pc);
395 
396 void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags,
397                             int pc);
398 
399 void __trace_stack(struct trace_array *tr, unsigned long flags, int skip,
400                    int pc);
401 #else
402 static inline void ftrace_trace_stack(struct ring_buffer *buffer,
403                                       unsigned long flags, int skip, int pc)
404 {
405 }
406 
407 static inline void ftrace_trace_userstack(struct ring_buffer *buffer,
408                                           unsigned long flags, int pc)
409 {
410 }
411 
412 static inline void __trace_stack(struct trace_array *tr, unsigned long flags,
413                                  int skip, int pc)
414 {
415 }
416 #endif /* CONFIG_STACKTRACE */
417 
418 extern cycle_t ftrace_now(int cpu);
419 
420 extern void trace_find_cmdline(int pid, char comm[]);
421 
422 #ifdef CONFIG_DYNAMIC_FTRACE
423 extern unsigned long ftrace_update_tot_cnt;
424 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
425 extern int DYN_FTRACE_TEST_NAME(void);
426 #define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2
427 extern int DYN_FTRACE_TEST_NAME2(void);
428 #endif
429 
430 extern int ring_buffer_expanded;
431 extern bool tracing_selftest_disabled;
432 DECLARE_PER_CPU(int, ftrace_cpu_disabled);
433 
434 #ifdef CONFIG_FTRACE_STARTUP_TEST
435 extern int trace_selftest_startup_function(struct tracer *trace,
436                                            struct trace_array *tr);
437 extern int trace_selftest_startup_function_graph(struct tracer *trace,
438                                                  struct trace_array *tr);
439 extern int trace_selftest_startup_irqsoff(struct tracer *trace,
440                                           struct trace_array *tr);
441 extern int trace_selftest_startup_preemptoff(struct tracer *trace,
442                                              struct trace_array *tr);
443 extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace,
444                                                  struct trace_array *tr);
445 extern int trace_selftest_startup_wakeup(struct tracer *trace,
446                                          struct trace_array *tr);
447 extern int trace_selftest_startup_nop(struct tracer *trace,
448                                          struct trace_array *tr);
449 extern int trace_selftest_startup_sched_switch(struct tracer *trace,
450                                                struct trace_array *tr);
451 extern int trace_selftest_startup_branch(struct tracer *trace,
452                                          struct trace_array *tr);
453 #endif /* CONFIG_FTRACE_STARTUP_TEST */
454 
455 extern void *head_page(struct trace_array_cpu *data);
456 extern unsigned long long ns2usecs(cycle_t nsec);
457 extern int
458 trace_vbprintk(unsigned long ip, const char *fmt, va_list args);
459 extern int
460 trace_vprintk(unsigned long ip, const char *fmt, va_list args);
461 extern int
462 trace_array_vprintk(struct trace_array *tr,
463                     unsigned long ip, const char *fmt, va_list args);
464 int trace_array_printk(struct trace_array *tr,
465                        unsigned long ip, const char *fmt, ...);
466 void trace_printk_seq(struct trace_seq *s);
467 enum print_line_t print_trace_line(struct trace_iterator *iter);
468 
469 extern unsigned long trace_flags;
470 
471 extern int trace_clock_id;
472 
473 /* Standard output formatting function used for function return traces */
474 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
475 
476 /* Flag options */
477 #define TRACE_GRAPH_PRINT_OVERRUN       0x1
478 #define TRACE_GRAPH_PRINT_CPU           0x2
479 #define TRACE_GRAPH_PRINT_OVERHEAD      0x4
480 #define TRACE_GRAPH_PRINT_PROC          0x8
481 #define TRACE_GRAPH_PRINT_DURATION      0x10
482 #define TRACE_GRAPH_PRINT_ABS_TIME      0x20
483 
484 extern enum print_line_t
485 print_graph_function_flags(struct trace_iterator *iter, u32 flags);
486 extern void print_graph_headers_flags(struct seq_file *s, u32 flags);
487 extern enum print_line_t
488 trace_print_graph_duration(unsigned long long duration, struct trace_seq *s);
489 extern void graph_trace_open(struct trace_iterator *iter);
490 extern void graph_trace_close(struct trace_iterator *iter);
491 extern int __trace_graph_entry(struct trace_array *tr,
492                                struct ftrace_graph_ent *trace,
493                                unsigned long flags, int pc);
494 extern void __trace_graph_return(struct trace_array *tr,
495                                  struct ftrace_graph_ret *trace,
496                                  unsigned long flags, int pc);
497 
498 
499 #ifdef CONFIG_DYNAMIC_FTRACE
500 /* TODO: make this variable */
501 #define FTRACE_GRAPH_MAX_FUNCS          32
502 extern int ftrace_graph_filter_enabled;
503 extern int ftrace_graph_count;
504 extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS];
505 
506 static inline int ftrace_graph_addr(unsigned long addr)
507 {
508         int i;
509 
510         if (!ftrace_graph_filter_enabled)
511                 return 1;
512 
513         for (i = 0; i < ftrace_graph_count; i++) {
514                 if (addr == ftrace_graph_funcs[i])
515                         return 1;
516         }
517 
518         return 0;
519 }
520 #else
521 static inline int ftrace_graph_addr(unsigned long addr)
522 {
523         return 1;
524 }
525 #endif /* CONFIG_DYNAMIC_FTRACE */
526 #else /* CONFIG_FUNCTION_GRAPH_TRACER */
527 static inline enum print_line_t
528 print_graph_function_flags(struct trace_iterator *iter, u32 flags)
529 {
530         return TRACE_TYPE_UNHANDLED;
531 }
532 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
533 
534 extern struct list_head ftrace_pids;
535 
536 #ifdef CONFIG_FUNCTION_TRACER
537 static inline int ftrace_trace_task(struct task_struct *task)
538 {
539         if (list_empty(&ftrace_pids))
540                 return 1;
541 
542         return test_tsk_trace_trace(task);
543 }
544 #else
545 static inline int ftrace_trace_task(struct task_struct *task)
546 {
547         return 1;
548 }
549 #endif
550 
551 /*
552  * struct trace_parser - servers for reading the user input separated by spaces
553  * @cont: set if the input is not complete - no final space char was found
554  * @buffer: holds the parsed user input
555  * @idx: user input length
556  * @size: buffer size
557  */
558 struct trace_parser {
559         bool            cont;
560         char            *buffer;
561         unsigned        idx;
562         unsigned        size;
563 };
564 
565 static inline bool trace_parser_loaded(struct trace_parser *parser)
566 {
567         return (parser->idx != 0);
568 }
569 
570 static inline bool trace_parser_cont(struct trace_parser *parser)
571 {
572         return parser->cont;
573 }
574 
575 static inline void trace_parser_clear(struct trace_parser *parser)
576 {
577         parser->cont = false;
578         parser->idx = 0;
579 }
580 
581 extern int trace_parser_get_init(struct trace_parser *parser, int size);
582 extern void trace_parser_put(struct trace_parser *parser);
583 extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
584         size_t cnt, loff_t *ppos);
585 
586 /*
587  * trace_iterator_flags is an enumeration that defines bit
588  * positions into trace_flags that controls the output.
589  *
590  * NOTE: These bits must match the trace_options array in
591  *       trace.c.
592  */
593 enum trace_iterator_flags {
594         TRACE_ITER_PRINT_PARENT         = 0x01,
595         TRACE_ITER_SYM_OFFSET           = 0x02,
596         TRACE_ITER_SYM_ADDR             = 0x04,
597         TRACE_ITER_VERBOSE              = 0x08,
598         TRACE_ITER_RAW                  = 0x10,
599         TRACE_ITER_HEX                  = 0x20,
600         TRACE_ITER_BIN                  = 0x40,
601         TRACE_ITER_BLOCK                = 0x80,
602         TRACE_ITER_STACKTRACE           = 0x100,
603         TRACE_ITER_PRINTK               = 0x200,
604         TRACE_ITER_PREEMPTONLY          = 0x400,
605         TRACE_ITER_BRANCH               = 0x800,
606         TRACE_ITER_ANNOTATE             = 0x1000,
607         TRACE_ITER_USERSTACKTRACE       = 0x2000,
608         TRACE_ITER_SYM_USEROBJ          = 0x4000,
609         TRACE_ITER_PRINTK_MSGONLY       = 0x8000,
610         TRACE_ITER_CONTEXT_INFO         = 0x10000, /* Print pid/cpu/time */
611         TRACE_ITER_LATENCY_FMT          = 0x20000,
612         TRACE_ITER_SLEEP_TIME           = 0x40000,
613         TRACE_ITER_GRAPH_TIME           = 0x80000,
614         TRACE_ITER_RECORD_CMD           = 0x100000,
615         TRACE_ITER_OVERWRITE            = 0x200000,
616 };
617 
618 /*
619  * TRACE_ITER_SYM_MASK masks the options in trace_flags that
620  * control the output of kernel symbols.
621  */
622 #define TRACE_ITER_SYM_MASK \
623         (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR)
624 
625 extern struct tracer nop_trace;
626 
627 #ifdef CONFIG_BRANCH_TRACER
628 extern int enable_branch_tracing(struct trace_array *tr);
629 extern void disable_branch_tracing(void);
630 static inline int trace_branch_enable(struct trace_array *tr)
631 {
632         if (trace_flags & TRACE_ITER_BRANCH)
633                 return enable_branch_tracing(tr);
634         return 0;
635 }
636 static inline void trace_branch_disable(void)
637 {
638         /* due to races, always disable */
639         disable_branch_tracing();
640 }
641 #else
642 static inline int trace_branch_enable(struct trace_array *tr)
643 {
644         return 0;
645 }
646 static inline void trace_branch_disable(void)
647 {
648 }
649 #endif /* CONFIG_BRANCH_TRACER */
650 
651 /* set ring buffers to default size if not already done so */
652 int tracing_update_buffers(void);
653 
654 /* trace event type bit fields, not numeric */
655 enum {
656         TRACE_EVENT_TYPE_PRINTF         = 1,
657         TRACE_EVENT_TYPE_RAW            = 2,
658 };
659 
660 struct ftrace_event_field {
661         struct list_head        link;
662         char                    *name;
663         char                    *type;
664         int                     filter_type;
665         int                     offset;
666         int                     size;
667         int                     is_signed;
668 };
669 
670 struct event_filter {
671         int                     n_preds;        /* Number assigned */
672         int                     a_preds;        /* allocated */
673         struct filter_pred      *preds;
674         struct filter_pred      *root;
675         char                    *filter_string;
676 };
677 
678 struct event_subsystem {
679         struct list_head        list;
680         const char              *name;
681         struct dentry           *entry;
682         struct event_filter     *filter;
683         int                     nr_events;
684         int                     ref_count;
685 };
686 
687 #define FILTER_PRED_INVALID     ((unsigned short)-1)
688 #define FILTER_PRED_IS_RIGHT    (1 << 15)
689 #define FILTER_PRED_FOLD        (1 << 15)
690 
691 /*
692  * The max preds is the size of unsigned short with
693  * two flags at the MSBs. One bit is used for both the IS_RIGHT
694  * and FOLD flags. The other is reserved.
695  *
696  * 2^14 preds is way more than enough.
697  */
698 #define MAX_FILTER_PRED         16384
699 
700 struct filter_pred;
701 struct regex;
702 
703 typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event);
704 
705 typedef int (*regex_match_func)(char *str, struct regex *r, int len);
706 
707 enum regex_type {
708         MATCH_FULL = 0,
709         MATCH_FRONT_ONLY,
710         MATCH_MIDDLE_ONLY,
711         MATCH_END_ONLY,
712 };
713 
714 struct regex {
715         char                    pattern[MAX_FILTER_STR_VAL];
716         int                     len;
717         int                     field_len;
718         regex_match_func        match;
719 };
720 
721 struct filter_pred {
722         filter_pred_fn_t        fn;
723         u64                     val;
724         struct regex            regex;
725         /*
726          * Leaf nodes use field_name, ops is used by AND and OR
727          * nodes. The field_name is always freed when freeing a pred.
728          * We can overload field_name for ops and have it freed
729          * as well.
730          */
731         union {
732                 char            *field_name;
733                 unsigned short  *ops;
734         };
735         int                     offset;
736         int                     not;
737         int                     op;
738         unsigned short          index;
739         unsigned short          parent;
740         unsigned short          left;
741         unsigned short          right;
742 };
743 
744 extern struct list_head ftrace_common_fields;
745 
746 extern enum regex_type
747 filter_parse_regex(char *buff, int len, char **search, int *not);
748 extern void print_event_filter(struct ftrace_event_call *call,
749                                struct trace_seq *s);
750 extern int apply_event_filter(struct ftrace_event_call *call,
751                               char *filter_string);
752 extern int apply_subsystem_event_filter(struct event_subsystem *system,
753                                         char *filter_string);
754 extern void print_subsystem_event_filter(struct event_subsystem *system,
755                                          struct trace_seq *s);
756 extern int filter_assign_type(const char *type);
757 
758 struct list_head *
759 trace_get_fields(struct ftrace_event_call *event_call);
760 
761 static inline int
762 filter_check_discard(struct ftrace_event_call *call, void *rec,
763                      struct ring_buffer *buffer,
764                      struct ring_buffer_event *event)
765 {
766         if (unlikely(call->flags & TRACE_EVENT_FL_FILTERED) &&
767             !filter_match_preds(call->filter, rec)) {
768                 ring_buffer_discard_commit(buffer, event);
769                 return 1;
770         }
771 
772         return 0;
773 }
774 
775 extern void trace_event_enable_cmd_record(bool enable);
776 
777 extern struct mutex event_mutex;
778 extern struct list_head ftrace_events;
779 
780 extern const char *__start___trace_bprintk_fmt[];
781 extern const char *__stop___trace_bprintk_fmt[];
782 
783 int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set);
784 int set_tracer_flag(unsigned int mask, int enabled);
785 
786 #undef FTRACE_ENTRY
787 #define FTRACE_ENTRY(call, struct_name, id, tstruct, print)             \
788         extern struct ftrace_event_call                                 \
789         __attribute__((__aligned__(4))) event_##call;
790 #undef FTRACE_ENTRY_DUP
791 #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print)         \
792         FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print))
793 #include "trace_entries.h"
794 
795 /* Only current can touch trace_recursion */
796 #define trace_recursion_inc() do { (current)->trace_recursion++; } while (0)
797 #define trace_recursion_dec() do { (current)->trace_recursion--; } while (0)
798 
799 /* Ring buffer has the 10 LSB bits to count */
800 #define trace_recursion_buffer() ((current)->trace_recursion & 0x3ff)
801 
802 /* for function tracing recursion */
803 #define TRACE_INTERNAL_BIT              (1<<11)
804 #define TRACE_GLOBAL_BIT                (1<<12)
805 
806 #define trace_recursion_set(bit)        do { (current)->trace_recursion |= (bit); } while (0)
807 #define trace_recursion_clear(bit)      do { (current)->trace_recursion &= ~(bit); } while (0)
808 #define trace_recursion_test(bit)       ((current)->trace_recursion & (bit))
809 
810 #endif /* _LINUX_KERNEL_TRACE_H */
811 

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