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 struct tracer *next;
275 struct tracer_flags *flags;
276 int print_max;
277 int use_max_tr;
278 };
279
280
281 #define TRACE_PIPE_ALL_CPU -1
282
283 int tracer_init(struct tracer *t, struct trace_array *tr);
284 int tracing_is_enabled(void);
285 void trace_wake_up(void);
286 void tracing_reset(struct trace_array *tr, int cpu);
287 void tracing_reset_online_cpus(struct trace_array *tr);
288 void tracing_reset_current(int cpu);
289 void tracing_reset_current_online_cpus(void);
290 int tracing_open_generic(struct inode *inode, struct file *filp);
291 struct dentry *trace_create_file(const char *name,
292 mode_t mode,
293 struct dentry *parent,
294 void *data,
295 const struct file_operations *fops);
296
297 struct dentry *tracing_init_dentry(void);
298
299 struct ring_buffer_event;
300
301 struct ring_buffer_event *
302 trace_buffer_lock_reserve(struct ring_buffer *buffer,
303 int type,
304 unsigned long len,
305 unsigned long flags,
306 int pc);
307 void trace_buffer_unlock_commit(struct ring_buffer *buffer,
308 struct ring_buffer_event *event,
309 unsigned long flags, int pc);
310
311 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,
312 struct trace_array_cpu *data);
313
314 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter,
315 int *ent_cpu, u64 *ent_ts);
316
317 int trace_empty(struct trace_iterator *iter);
318
319 void *trace_find_next_entry_inc(struct trace_iterator *iter);
320
321 void trace_init_global_iter(struct trace_iterator *iter);
322
323 void tracing_iter_reset(struct trace_iterator *iter, int cpu);
324
325 void default_wait_pipe(struct trace_iterator *iter);
326 void poll_wait_pipe(struct trace_iterator *iter);
327
328 void ftrace(struct trace_array *tr,
329 struct trace_array_cpu *data,
330 unsigned long ip,
331 unsigned long parent_ip,
332 unsigned long flags, int pc);
333 void tracing_sched_switch_trace(struct trace_array *tr,
334 struct task_struct *prev,
335 struct task_struct *next,
336 unsigned long flags, int pc);
337
338 void tracing_sched_wakeup_trace(struct trace_array *tr,
339 struct task_struct *wakee,
340 struct task_struct *cur,
341 unsigned long flags, int pc);
342 void trace_function(struct trace_array *tr,
343 unsigned long ip,
344 unsigned long parent_ip,
345 unsigned long flags, int pc);
346 void trace_graph_function(struct trace_array *tr,
347 unsigned long ip,
348 unsigned long parent_ip,
349 unsigned long flags, int pc);
350 void trace_default_header(struct seq_file *m);
351 void print_trace_header(struct seq_file *m, struct trace_iterator *iter);
352 int trace_empty(struct trace_iterator *iter);
353
354 void trace_graph_return(struct ftrace_graph_ret *trace);
355 int trace_graph_entry(struct ftrace_graph_ent *trace);
356 void set_graph_array(struct trace_array *tr);
357
358 void tracing_start_cmdline_record(void);
359 void tracing_stop_cmdline_record(void);
360 void tracing_sched_switch_assign_trace(struct trace_array *tr);
361 void tracing_stop_sched_switch_record(void);
362 void tracing_start_sched_switch_record(void);
363 int register_tracer(struct tracer *type);
364 void unregister_tracer(struct tracer *type);
365 int is_tracing_stopped(void);
366 enum trace_file_type {
367 TRACE_FILE_LAT_FMT = 1,
368 TRACE_FILE_ANNOTATE = 2,
369 };
370
371 extern cpumask_var_t __read_mostly tracing_buffer_mask;
372
373 #define for_each_tracing_cpu(cpu) \
374 for_each_cpu(cpu, tracing_buffer_mask)
375
376 extern unsigned long nsecs_to_usecs(unsigned long nsecs);
377
378 extern unsigned long tracing_thresh;
379
380 #ifdef CONFIG_TRACER_MAX_TRACE
381 extern unsigned long tracing_max_latency;
382
383 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu);
384 void update_max_tr_single(struct trace_array *tr,
385 struct task_struct *tsk, int cpu);
386 #endif /* CONFIG_TRACER_MAX_TRACE */
387
388 #ifdef CONFIG_STACKTRACE
389 void ftrace_trace_stack(struct ring_buffer *buffer, unsigned long flags,
390 int skip, int pc);
391
392 void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags,
393 int pc);
394
395 void __trace_stack(struct trace_array *tr, unsigned long flags, int skip,
396 int pc);
397 #else
ftrace_trace_stack(struct ring_buffer * buffer,unsigned long flags,int skip,int pc)398 static inline void ftrace_trace_stack(struct ring_buffer *buffer,
399 unsigned long flags, int skip, int pc)
400 {
401 }
402
ftrace_trace_userstack(struct ring_buffer * buffer,unsigned long flags,int pc)403 static inline void ftrace_trace_userstack(struct ring_buffer *buffer,
404 unsigned long flags, int pc)
405 {
406 }
407
__trace_stack(struct trace_array * tr,unsigned long flags,int skip,int pc)408 static inline void __trace_stack(struct trace_array *tr, unsigned long flags,
409 int skip, int pc)
410 {
411 }
412 #endif /* CONFIG_STACKTRACE */
413
414 extern cycle_t ftrace_now(int cpu);
415
416 extern void trace_find_cmdline(int pid, char comm[]);
417
418 #ifdef CONFIG_DYNAMIC_FTRACE
419 extern unsigned long ftrace_update_tot_cnt;
420 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
421 extern int DYN_FTRACE_TEST_NAME(void);
422 #endif
423
424 extern int ring_buffer_expanded;
425 extern bool tracing_selftest_disabled;
426 DECLARE_PER_CPU(int, ftrace_cpu_disabled);
427
428 #ifdef CONFIG_FTRACE_STARTUP_TEST
429 extern int trace_selftest_startup_function(struct tracer *trace,
430 struct trace_array *tr);
431 extern int trace_selftest_startup_function_graph(struct tracer *trace,
432 struct trace_array *tr);
433 extern int trace_selftest_startup_irqsoff(struct tracer *trace,
434 struct trace_array *tr);
435 extern int trace_selftest_startup_preemptoff(struct tracer *trace,
436 struct trace_array *tr);
437 extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace,
438 struct trace_array *tr);
439 extern int trace_selftest_startup_wakeup(struct tracer *trace,
440 struct trace_array *tr);
441 extern int trace_selftest_startup_nop(struct tracer *trace,
442 struct trace_array *tr);
443 extern int trace_selftest_startup_sched_switch(struct tracer *trace,
444 struct trace_array *tr);
445 extern int trace_selftest_startup_branch(struct tracer *trace,
446 struct trace_array *tr);
447 #endif /* CONFIG_FTRACE_STARTUP_TEST */
448
449 extern void *head_page(struct trace_array_cpu *data);
450 extern unsigned long long ns2usecs(cycle_t nsec);
451 extern int
452 trace_vbprintk(unsigned long ip, const char *fmt, va_list args);
453 extern int
454 trace_vprintk(unsigned long ip, const char *fmt, va_list args);
455 extern int
456 trace_array_vprintk(struct trace_array *tr,
457 unsigned long ip, const char *fmt, va_list args);
458 int trace_array_printk(struct trace_array *tr,
459 unsigned long ip, const char *fmt, ...);
460 void trace_printk_seq(struct trace_seq *s);
461 enum print_line_t print_trace_line(struct trace_iterator *iter);
462
463 extern unsigned long trace_flags;
464
465 extern int trace_clock_id;
466
467 /* Standard output formatting function used for function return traces */
468 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
469
470 /* Flag options */
471 #define TRACE_GRAPH_PRINT_OVERRUN 0x1
472 #define TRACE_GRAPH_PRINT_CPU 0x2
473 #define TRACE_GRAPH_PRINT_OVERHEAD 0x4
474 #define TRACE_GRAPH_PRINT_PROC 0x8
475 #define TRACE_GRAPH_PRINT_DURATION 0x10
476 #define TRACE_GRAPH_PRINT_ABS_TIME 0x20
477
478 extern enum print_line_t
479 print_graph_function_flags(struct trace_iterator *iter, u32 flags);
480 extern void print_graph_headers_flags(struct seq_file *s, u32 flags);
481 extern enum print_line_t
482 trace_print_graph_duration(unsigned long long duration, struct trace_seq *s);
483 extern void graph_trace_open(struct trace_iterator *iter);
484 extern void graph_trace_close(struct trace_iterator *iter);
485 extern int __trace_graph_entry(struct trace_array *tr,
486 struct ftrace_graph_ent *trace,
487 unsigned long flags, int pc);
488 extern void __trace_graph_return(struct trace_array *tr,
489 struct ftrace_graph_ret *trace,
490 unsigned long flags, int pc);
491
492
493 #ifdef CONFIG_DYNAMIC_FTRACE
494 /* TODO: make this variable */
495 #define FTRACE_GRAPH_MAX_FUNCS 32
496 extern int ftrace_graph_filter_enabled;
497 extern int ftrace_graph_count;
498 extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS];
499
ftrace_graph_addr(unsigned long addr)500 static inline int ftrace_graph_addr(unsigned long addr)
501 {
502 int i;
503
504 if (!ftrace_graph_filter_enabled)
505 return 1;
506
507 for (i = 0; i < ftrace_graph_count; i++) {
508 if (addr == ftrace_graph_funcs[i])
509 return 1;
510 }
511
512 return 0;
513 }
514 #else
ftrace_graph_addr(unsigned long addr)515 static inline int ftrace_graph_addr(unsigned long addr)
516 {
517 return 1;
518 }
519 #endif /* CONFIG_DYNAMIC_FTRACE */
520 #else /* CONFIG_FUNCTION_GRAPH_TRACER */
521 static inline enum print_line_t
print_graph_function_flags(struct trace_iterator * iter,u32 flags)522 print_graph_function_flags(struct trace_iterator *iter, u32 flags)
523 {
524 return TRACE_TYPE_UNHANDLED;
525 }
526 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
527
528 extern struct list_head ftrace_pids;
529
530 #ifdef CONFIG_FUNCTION_TRACER
ftrace_trace_task(struct task_struct * task)531 static inline int ftrace_trace_task(struct task_struct *task)
532 {
533 if (list_empty(&ftrace_pids))
534 return 1;
535
536 return test_tsk_trace_trace(task);
537 }
538 #else
ftrace_trace_task(struct task_struct * task)539 static inline int ftrace_trace_task(struct task_struct *task)
540 {
541 return 1;
542 }
543 #endif
544
545 /*
546 * struct trace_parser - servers for reading the user input separated by spaces
547 * @cont: set if the input is not complete - no final space char was found
548 * @buffer: holds the parsed user input
549 * @idx: user input length
550 * @size: buffer size
551 */
552 struct trace_parser {
553 bool cont;
554 char *buffer;
555 unsigned idx;
556 unsigned size;
557 };
558
trace_parser_loaded(struct trace_parser * parser)559 static inline bool trace_parser_loaded(struct trace_parser *parser)
560 {
561 return (parser->idx != 0);
562 }
563
trace_parser_cont(struct trace_parser * parser)564 static inline bool trace_parser_cont(struct trace_parser *parser)
565 {
566 return parser->cont;
567 }
568
trace_parser_clear(struct trace_parser * parser)569 static inline void trace_parser_clear(struct trace_parser *parser)
570 {
571 parser->cont = false;
572 parser->idx = 0;
573 }
574
575 extern int trace_parser_get_init(struct trace_parser *parser, int size);
576 extern void trace_parser_put(struct trace_parser *parser);
577 extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
578 size_t cnt, loff_t *ppos);
579
580 /*
581 * trace_iterator_flags is an enumeration that defines bit
582 * positions into trace_flags that controls the output.
583 *
584 * NOTE: These bits must match the trace_options array in
585 * trace.c.
586 */
587 enum trace_iterator_flags {
588 TRACE_ITER_PRINT_PARENT = 0x01,
589 TRACE_ITER_SYM_OFFSET = 0x02,
590 TRACE_ITER_SYM_ADDR = 0x04,
591 TRACE_ITER_VERBOSE = 0x08,
592 TRACE_ITER_RAW = 0x10,
593 TRACE_ITER_HEX = 0x20,
594 TRACE_ITER_BIN = 0x40,
595 TRACE_ITER_BLOCK = 0x80,
596 TRACE_ITER_STACKTRACE = 0x100,
597 TRACE_ITER_PRINTK = 0x200,
598 TRACE_ITER_PREEMPTONLY = 0x400,
599 TRACE_ITER_BRANCH = 0x800,
600 TRACE_ITER_ANNOTATE = 0x1000,
601 TRACE_ITER_USERSTACKTRACE = 0x2000,
602 TRACE_ITER_SYM_USEROBJ = 0x4000,
603 TRACE_ITER_PRINTK_MSGONLY = 0x8000,
604 TRACE_ITER_CONTEXT_INFO = 0x10000, /* Print pid/cpu/time */
605 TRACE_ITER_LATENCY_FMT = 0x20000,
606 TRACE_ITER_SLEEP_TIME = 0x40000,
607 TRACE_ITER_GRAPH_TIME = 0x80000,
608 TRACE_ITER_RECORD_CMD = 0x100000,
609 TRACE_ITER_OVERWRITE = 0x200000,
610 };
611
612 /*
613 * TRACE_ITER_SYM_MASK masks the options in trace_flags that
614 * control the output of kernel symbols.
615 */
616 #define TRACE_ITER_SYM_MASK \
617 (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR)
618
619 extern struct tracer nop_trace;
620
621 #ifdef CONFIG_BRANCH_TRACER
622 extern int enable_branch_tracing(struct trace_array *tr);
623 extern void disable_branch_tracing(void);
trace_branch_enable(struct trace_array * tr)624 static inline int trace_branch_enable(struct trace_array *tr)
625 {
626 if (trace_flags & TRACE_ITER_BRANCH)
627 return enable_branch_tracing(tr);
628 return 0;
629 }
trace_branch_disable(void)630 static inline void trace_branch_disable(void)
631 {
632 /* due to races, always disable */
633 disable_branch_tracing();
634 }
635 #else
trace_branch_enable(struct trace_array * tr)636 static inline int trace_branch_enable(struct trace_array *tr)
637 {
638 return 0;
639 }
trace_branch_disable(void)640 static inline void trace_branch_disable(void)
641 {
642 }
643 #endif /* CONFIG_BRANCH_TRACER */
644
645 /* set ring buffers to default size if not already done so */
646 int tracing_update_buffers(void);
647
648 /* trace event type bit fields, not numeric */
649 enum {
650 TRACE_EVENT_TYPE_PRINTF = 1,
651 TRACE_EVENT_TYPE_RAW = 2,
652 };
653
654 struct ftrace_event_field {
655 struct list_head link;
656 char *name;
657 char *type;
658 int filter_type;
659 int offset;
660 int size;
661 int is_signed;
662 };
663
664 struct event_filter {
665 int n_preds; /* Number assigned */
666 int a_preds; /* allocated */
667 struct filter_pred *preds;
668 struct filter_pred *root;
669 char *filter_string;
670 };
671
672 struct event_subsystem {
673 struct list_head list;
674 const char *name;
675 struct dentry *entry;
676 struct event_filter *filter;
677 int nr_events;
678 };
679
680 #define FILTER_PRED_INVALID ((unsigned short)-1)
681 #define FILTER_PRED_IS_RIGHT (1 << 15)
682 #define FILTER_PRED_FOLD (1 << 15)
683
684 /*
685 * The max preds is the size of unsigned short with
686 * two flags at the MSBs. One bit is used for both the IS_RIGHT
687 * and FOLD flags. The other is reserved.
688 *
689 * 2^14 preds is way more than enough.
690 */
691 #define MAX_FILTER_PRED 16384
692
693 struct filter_pred;
694 struct regex;
695
696 typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event);
697
698 typedef int (*regex_match_func)(char *str, struct regex *r, int len);
699
700 enum regex_type {
701 MATCH_FULL = 0,
702 MATCH_FRONT_ONLY,
703 MATCH_MIDDLE_ONLY,
704 MATCH_END_ONLY,
705 };
706
707 struct regex {
708 char pattern[MAX_FILTER_STR_VAL];
709 int len;
710 int field_len;
711 regex_match_func match;
712 };
713
714 struct filter_pred {
715 filter_pred_fn_t fn;
716 u64 val;
717 struct regex regex;
718 /*
719 * Leaf nodes use field_name, ops is used by AND and OR
720 * nodes. The field_name is always freed when freeing a pred.
721 * We can overload field_name for ops and have it freed
722 * as well.
723 */
724 union {
725 char *field_name;
726 unsigned short *ops;
727 };
728 int offset;
729 int not;
730 int op;
731 unsigned short index;
732 unsigned short parent;
733 unsigned short left;
734 unsigned short right;
735 };
736
737 extern struct list_head ftrace_common_fields;
738
739 extern enum regex_type
740 filter_parse_regex(char *buff, int len, char **search, int *not);
741 extern void print_event_filter(struct ftrace_event_call *call,
742 struct trace_seq *s);
743 extern int apply_event_filter(struct ftrace_event_call *call,
744 char *filter_string);
745 extern int apply_subsystem_event_filter(struct event_subsystem *system,
746 char *filter_string);
747 extern void print_subsystem_event_filter(struct event_subsystem *system,
748 struct trace_seq *s);
749 extern int filter_assign_type(const char *type);
750
751 struct list_head *
752 trace_get_fields(struct ftrace_event_call *event_call);
753
754 static inline int
filter_check_discard(struct ftrace_event_call * call,void * rec,struct ring_buffer * buffer,struct ring_buffer_event * event)755 filter_check_discard(struct ftrace_event_call *call, void *rec,
756 struct ring_buffer *buffer,
757 struct ring_buffer_event *event)
758 {
759 if (unlikely(call->flags & TRACE_EVENT_FL_FILTERED) &&
760 !filter_match_preds(call->filter, rec)) {
761 ring_buffer_discard_commit(buffer, event);
762 return 1;
763 }
764
765 return 0;
766 }
767
768 extern void trace_event_enable_cmd_record(bool enable);
769
770 extern struct mutex event_mutex;
771 extern struct list_head ftrace_events;
772
773 extern const char *__start___trace_bprintk_fmt[];
774 extern const char *__stop___trace_bprintk_fmt[];
775
776 #undef FTRACE_ENTRY
777 #define FTRACE_ENTRY(call, struct_name, id, tstruct, print) \
778 extern struct ftrace_event_call \
779 __attribute__((__aligned__(4))) event_##call;
780 #undef FTRACE_ENTRY_DUP
781 #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print) \
782 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print))
783 #include "trace_entries.h"
784
785 #endif /* _LINUX_KERNEL_TRACE_H */
786