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#ifdef CONFIG_FTRACE_SYSCALLS
17#include <asm/unistd.h>
18#include <asm/syscall.h>
19#endif
20
21enum trace_type {
22 __TRACE_FIRST_TYPE = 0,
23
24 TRACE_FN,
25 TRACE_CTX,
26 TRACE_WAKE,
27 TRACE_STACK,
28 TRACE_PRINT,
29 TRACE_BPRINT,
30 TRACE_MMIO_RW,
31 TRACE_MMIO_MAP,
32 TRACE_BRANCH,
33 TRACE_GRAPH_RET,
34 TRACE_GRAPH_ENT,
35 TRACE_USER_STACK,
36 TRACE_BLK,
37 TRACE_BPUTS,
38
39 __TRACE_LAST_TYPE,
40};
41
42
43#undef __field
44#define __field(type, item) type item;
45
46#undef __field_struct
47#define __field_struct(type, item) __field(type, item)
48
49#undef __field_desc
50#define __field_desc(type, container, item)
51
52#undef __array
53#define __array(type, item, size) type item[size];
54
55#undef __array_desc
56#define __array_desc(type, container, item, size)
57
58#undef __dynamic_array
59#define __dynamic_array(type, item) type item[];
60
61#undef F_STRUCT
62#define F_STRUCT(args...) args
63
64#undef FTRACE_ENTRY
65#define FTRACE_ENTRY(name, struct_name, id, tstruct, print, filter) \
66 struct struct_name { \
67 struct trace_entry ent; \
68 tstruct \
69 }
70
71#undef TP_ARGS
72#define TP_ARGS(args...) args
73
74#undef FTRACE_ENTRY_DUP
75#define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk, filter)
76
77#undef FTRACE_ENTRY_REG
78#define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, \
79 filter, regfn) \
80 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \
81 filter)
82
83#include "trace_entries.h"
84
85
86
87
88
89struct syscall_trace_enter {
90 struct trace_entry ent;
91 int nr;
92 unsigned long args[];
93};
94
95struct syscall_trace_exit {
96 struct trace_entry ent;
97 int nr;
98 long ret;
99};
100
101struct kprobe_trace_entry_head {
102 struct trace_entry ent;
103 unsigned long ip;
104};
105
106struct kretprobe_trace_entry_head {
107 struct trace_entry ent;
108 unsigned long func;
109 unsigned long ret_ip;
110};
111
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119
120
121enum trace_flag_type {
122 TRACE_FLAG_IRQS_OFF = 0x01,
123 TRACE_FLAG_IRQS_NOSUPPORT = 0x02,
124 TRACE_FLAG_NEED_RESCHED = 0x04,
125 TRACE_FLAG_HARDIRQ = 0x08,
126 TRACE_FLAG_SOFTIRQ = 0x10,
127};
128
129#define TRACE_BUF_SIZE 1024
130
131struct trace_array;
132
133struct trace_cpu {
134 struct trace_array *tr;
135 struct dentry *dir;
136 int cpu;
137};
138
139
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141
142
143
144struct trace_array_cpu {
145 struct trace_cpu trace_cpu;
146 atomic_t disabled;
147 void *buffer_page;
148
149 unsigned long entries;
150 unsigned long saved_latency;
151 unsigned long critical_start;
152 unsigned long critical_end;
153 unsigned long critical_sequence;
154 unsigned long nice;
155 unsigned long policy;
156 unsigned long rt_priority;
157 unsigned long skipped_entries;
158 cycle_t preempt_timestamp;
159 pid_t pid;
160 kuid_t uid;
161 char comm[TASK_COMM_LEN];
162};
163
164struct tracer;
165
166struct trace_buffer {
167 struct trace_array *tr;
168 struct ring_buffer *buffer;
169 struct trace_array_cpu __percpu *data;
170 cycle_t time_start;
171 int cpu;
172};
173
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178
179struct trace_array {
180 struct list_head list;
181 char *name;
182 struct trace_buffer trace_buffer;
183#ifdef CONFIG_TRACER_MAX_TRACE
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194
195 struct trace_buffer max_buffer;
196 bool allocated_snapshot;
197#endif
198 int buffer_disabled;
199 struct trace_cpu trace_cpu;
200#ifdef CONFIG_FTRACE_SYSCALLS
201 int sys_refcount_enter;
202 int sys_refcount_exit;
203 DECLARE_BITMAP(enabled_enter_syscalls, NR_syscalls);
204 DECLARE_BITMAP(enabled_exit_syscalls, NR_syscalls);
205#endif
206 int stop_count;
207 int clock_id;
208 struct tracer *current_trace;
209 unsigned int flags;
210 raw_spinlock_t start_lock;
211 struct dentry *dir;
212 struct dentry *options;
213 struct dentry *percpu_dir;
214 struct dentry *event_dir;
215 struct list_head systems;
216 struct list_head events;
217 struct task_struct *waiter;
218 int ref;
219};
220
221enum {
222 TRACE_ARRAY_FL_GLOBAL = (1 << 0)
223};
224
225extern struct list_head ftrace_trace_arrays;
226
227
228
229
230
231static inline struct trace_array *top_trace_array(void)
232{
233 struct trace_array *tr;
234
235 tr = list_entry(ftrace_trace_arrays.prev,
236 typeof(*tr), list);
237 WARN_ON(!(tr->flags & TRACE_ARRAY_FL_GLOBAL));
238 return tr;
239}
240
241#define FTRACE_CMP_TYPE(var, type) \
242 __builtin_types_compatible_p(typeof(var), type *)
243
244#undef IF_ASSIGN
245#define IF_ASSIGN(var, entry, etype, id) \
246 if (FTRACE_CMP_TYPE(var, etype)) { \
247 var = (typeof(var))(entry); \
248 WARN_ON(id && (entry)->type != id); \
249 break; \
250 }
251
252
253extern void __ftrace_bad_type(void);
254
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264
265
266
267
268#define trace_assign_type(var, ent) \
269 do { \
270 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \
271 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \
272 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \
273 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\
274 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \
275 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \
276 IF_ASSIGN(var, ent, struct bputs_entry, TRACE_BPUTS); \
277 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \
278 TRACE_MMIO_RW); \
279 IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \
280 TRACE_MMIO_MAP); \
281 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \
282 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \
283 TRACE_GRAPH_ENT); \
284 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \
285 TRACE_GRAPH_RET); \
286 __ftrace_bad_type(); \
287 } while (0)
288
289
290
291
292
293
294struct tracer_opt {
295 const char *name;
296 u32 bit;
297};
298
299
300
301
302
303struct tracer_flags {
304 u32 val;
305 struct tracer_opt *opts;
306};
307
308
309#define TRACER_OPT(s, b) .name = #s, .bit = b
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331
332struct tracer {
333 const char *name;
334 int (*init)(struct trace_array *tr);
335 void (*reset)(struct trace_array *tr);
336 void (*start)(struct trace_array *tr);
337 void (*stop)(struct trace_array *tr);
338 void (*open)(struct trace_iterator *iter);
339 void (*pipe_open)(struct trace_iterator *iter);
340 void (*wait_pipe)(struct trace_iterator *iter);
341 void (*close)(struct trace_iterator *iter);
342 void (*pipe_close)(struct trace_iterator *iter);
343 ssize_t (*read)(struct trace_iterator *iter,
344 struct file *filp, char __user *ubuf,
345 size_t cnt, loff_t *ppos);
346 ssize_t (*splice_read)(struct trace_iterator *iter,
347 struct file *filp,
348 loff_t *ppos,
349 struct pipe_inode_info *pipe,
350 size_t len,
351 unsigned int flags);
352#ifdef CONFIG_FTRACE_STARTUP_TEST
353 int (*selftest)(struct tracer *trace,
354 struct trace_array *tr);
355#endif
356 void (*print_header)(struct seq_file *m);
357 enum print_line_t (*print_line)(struct trace_iterator *iter);
358
359 int (*set_flag)(u32 old_flags, u32 bit, int set);
360
361 int (*flag_changed)(struct tracer *tracer,
362 u32 mask, int set);
363 struct tracer *next;
364 struct tracer_flags *flags;
365 bool print_max;
366 bool enabled;
367#ifdef CONFIG_TRACER_MAX_TRACE
368 bool use_max_tr;
369#endif
370};
371
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399
400enum {
401 TRACE_BUFFER_BIT,
402 TRACE_BUFFER_NMI_BIT,
403 TRACE_BUFFER_IRQ_BIT,
404 TRACE_BUFFER_SIRQ_BIT,
405
406
407 TRACE_FTRACE_BIT,
408 TRACE_FTRACE_NMI_BIT,
409 TRACE_FTRACE_IRQ_BIT,
410 TRACE_FTRACE_SIRQ_BIT,
411
412
413 TRACE_GLOBAL_BIT,
414 TRACE_GLOBAL_NMI_BIT,
415 TRACE_GLOBAL_IRQ_BIT,
416 TRACE_GLOBAL_SIRQ_BIT,
417
418
419 TRACE_INTERNAL_BIT,
420 TRACE_INTERNAL_NMI_BIT,
421 TRACE_INTERNAL_IRQ_BIT,
422 TRACE_INTERNAL_SIRQ_BIT,
423
424 TRACE_CONTROL_BIT,
425
426
427
428
429
430
431
432
433 TRACE_IRQ_BIT,
434};
435
436#define trace_recursion_set(bit) do { (current)->trace_recursion |= (1<<(bit)); } while (0)
437#define trace_recursion_clear(bit) do { (current)->trace_recursion &= ~(1<<(bit)); } while (0)
438#define trace_recursion_test(bit) ((current)->trace_recursion & (1<<(bit)))
439
440#define TRACE_CONTEXT_BITS 4
441
442#define TRACE_FTRACE_START TRACE_FTRACE_BIT
443#define TRACE_FTRACE_MAX ((1 << (TRACE_FTRACE_START + TRACE_CONTEXT_BITS)) - 1)
444
445#define TRACE_GLOBAL_START TRACE_GLOBAL_BIT
446#define TRACE_GLOBAL_MAX ((1 << (TRACE_GLOBAL_START + TRACE_CONTEXT_BITS)) - 1)
447
448#define TRACE_LIST_START TRACE_INTERNAL_BIT
449#define TRACE_LIST_MAX ((1 << (TRACE_LIST_START + TRACE_CONTEXT_BITS)) - 1)
450
451#define TRACE_CONTEXT_MASK TRACE_LIST_MAX
452
453static __always_inline int trace_get_context_bit(void)
454{
455 int bit;
456
457 if (in_interrupt()) {
458 if (in_nmi())
459 bit = 0;
460
461 else if (in_irq())
462 bit = 1;
463 else
464 bit = 2;
465 } else
466 bit = 3;
467
468 return bit;
469}
470
471static __always_inline int trace_test_and_set_recursion(int start, int max)
472{
473 unsigned int val = current->trace_recursion;
474 int bit;
475
476
477 if ((val & TRACE_CONTEXT_MASK) > max)
478 return 0;
479
480 bit = trace_get_context_bit() + start;
481 if (unlikely(val & (1 << bit)))
482 return -1;
483
484 val |= 1 << bit;
485 current->trace_recursion = val;
486 barrier();
487
488 return bit;
489}
490
491static __always_inline void trace_clear_recursion(int bit)
492{
493 unsigned int val = current->trace_recursion;
494
495 if (!bit)
496 return;
497
498 bit = 1 << bit;
499 val &= ~bit;
500
501 barrier();
502 current->trace_recursion = val;
503}
504
505static inline struct ring_buffer_iter *
506trace_buffer_iter(struct trace_iterator *iter, int cpu)
507{
508 if (iter->buffer_iter && iter->buffer_iter[cpu])
509 return iter->buffer_iter[cpu];
510 return NULL;
511}
512
513int tracer_init(struct tracer *t, struct trace_array *tr);
514int tracing_is_enabled(void);
515void tracing_reset(struct trace_buffer *buf, int cpu);
516void tracing_reset_online_cpus(struct trace_buffer *buf);
517void tracing_reset_current(int cpu);
518void tracing_reset_all_online_cpus(void);
519int tracing_open_generic(struct inode *inode, struct file *filp);
520struct dentry *trace_create_file(const char *name,
521 umode_t mode,
522 struct dentry *parent,
523 void *data,
524 const struct file_operations *fops);
525
526struct dentry *tracing_init_dentry_tr(struct trace_array *tr);
527struct dentry *tracing_init_dentry(void);
528
529struct ring_buffer_event;
530
531struct ring_buffer_event *
532trace_buffer_lock_reserve(struct ring_buffer *buffer,
533 int type,
534 unsigned long len,
535 unsigned long flags,
536 int pc);
537
538struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,
539 struct trace_array_cpu *data);
540
541struct trace_entry *trace_find_next_entry(struct trace_iterator *iter,
542 int *ent_cpu, u64 *ent_ts);
543
544void __buffer_unlock_commit(struct ring_buffer *buffer,
545 struct ring_buffer_event *event);
546
547int trace_empty(struct trace_iterator *iter);
548
549void *trace_find_next_entry_inc(struct trace_iterator *iter);
550
551void trace_init_global_iter(struct trace_iterator *iter);
552
553void tracing_iter_reset(struct trace_iterator *iter, int cpu);
554
555void poll_wait_pipe(struct trace_iterator *iter);
556
557void ftrace(struct trace_array *tr,
558 struct trace_array_cpu *data,
559 unsigned long ip,
560 unsigned long parent_ip,
561 unsigned long flags, int pc);
562void tracing_sched_switch_trace(struct trace_array *tr,
563 struct task_struct *prev,
564 struct task_struct *next,
565 unsigned long flags, int pc);
566
567void tracing_sched_wakeup_trace(struct trace_array *tr,
568 struct task_struct *wakee,
569 struct task_struct *cur,
570 unsigned long flags, int pc);
571void trace_function(struct trace_array *tr,
572 unsigned long ip,
573 unsigned long parent_ip,
574 unsigned long flags, int pc);
575void trace_graph_function(struct trace_array *tr,
576 unsigned long ip,
577 unsigned long parent_ip,
578 unsigned long flags, int pc);
579void trace_latency_header(struct seq_file *m);
580void trace_default_header(struct seq_file *m);
581void print_trace_header(struct seq_file *m, struct trace_iterator *iter);
582int trace_empty(struct trace_iterator *iter);
583
584void trace_graph_return(struct ftrace_graph_ret *trace);
585int trace_graph_entry(struct ftrace_graph_ent *trace);
586void set_graph_array(struct trace_array *tr);
587
588void tracing_start_cmdline_record(void);
589void tracing_stop_cmdline_record(void);
590void tracing_sched_switch_assign_trace(struct trace_array *tr);
591void tracing_stop_sched_switch_record(void);
592void tracing_start_sched_switch_record(void);
593int register_tracer(struct tracer *type);
594int is_tracing_stopped(void);
595
596extern cpumask_var_t __read_mostly tracing_buffer_mask;
597
598#define for_each_tracing_cpu(cpu) \
599 for_each_cpu(cpu, tracing_buffer_mask)
600
601extern unsigned long nsecs_to_usecs(unsigned long nsecs);
602
603extern unsigned long tracing_thresh;
604
605#ifdef CONFIG_TRACER_MAX_TRACE
606extern unsigned long tracing_max_latency;
607
608void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu);
609void update_max_tr_single(struct trace_array *tr,
610 struct task_struct *tsk, int cpu);
611#endif
612
613#ifdef CONFIG_STACKTRACE
614void ftrace_trace_stack(struct ring_buffer *buffer, unsigned long flags,
615 int skip, int pc);
616
617void ftrace_trace_stack_regs(struct ring_buffer *buffer, unsigned long flags,
618 int skip, int pc, struct pt_regs *regs);
619
620void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags,
621 int pc);
622
623void __trace_stack(struct trace_array *tr, unsigned long flags, int skip,
624 int pc);
625#else
626static inline void ftrace_trace_stack(struct ring_buffer *buffer,
627 unsigned long flags, int skip, int pc)
628{
629}
630
631static inline void ftrace_trace_stack_regs(struct ring_buffer *buffer,
632 unsigned long flags, int skip,
633 int pc, struct pt_regs *regs)
634{
635}
636
637static inline void ftrace_trace_userstack(struct ring_buffer *buffer,
638 unsigned long flags, int pc)
639{
640}
641
642static inline void __trace_stack(struct trace_array *tr, unsigned long flags,
643 int skip, int pc)
644{
645}
646#endif
647
648extern cycle_t ftrace_now(int cpu);
649
650extern void trace_find_cmdline(int pid, char comm[]);
651
652#ifdef CONFIG_DYNAMIC_FTRACE
653extern unsigned long ftrace_update_tot_cnt;
654#endif
655#define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
656extern int DYN_FTRACE_TEST_NAME(void);
657#define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2
658extern int DYN_FTRACE_TEST_NAME2(void);
659
660extern bool ring_buffer_expanded;
661extern bool tracing_selftest_disabled;
662DECLARE_PER_CPU(int, ftrace_cpu_disabled);
663
664#ifdef CONFIG_FTRACE_STARTUP_TEST
665extern int trace_selftest_startup_function(struct tracer *trace,
666 struct trace_array *tr);
667extern int trace_selftest_startup_function_graph(struct tracer *trace,
668 struct trace_array *tr);
669extern int trace_selftest_startup_irqsoff(struct tracer *trace,
670 struct trace_array *tr);
671extern int trace_selftest_startup_preemptoff(struct tracer *trace,
672 struct trace_array *tr);
673extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace,
674 struct trace_array *tr);
675extern int trace_selftest_startup_wakeup(struct tracer *trace,
676 struct trace_array *tr);
677extern int trace_selftest_startup_nop(struct tracer *trace,
678 struct trace_array *tr);
679extern int trace_selftest_startup_sched_switch(struct tracer *trace,
680 struct trace_array *tr);
681extern int trace_selftest_startup_branch(struct tracer *trace,
682 struct trace_array *tr);
683#endif
684
685extern void *head_page(struct trace_array_cpu *data);
686extern unsigned long long ns2usecs(cycle_t nsec);
687extern int
688trace_vbprintk(unsigned long ip, const char *fmt, va_list args);
689extern int
690trace_vprintk(unsigned long ip, const char *fmt, va_list args);
691extern int
692trace_array_vprintk(struct trace_array *tr,
693 unsigned long ip, const char *fmt, va_list args);
694int trace_array_printk(struct trace_array *tr,
695 unsigned long ip, const char *fmt, ...);
696int trace_array_printk_buf(struct ring_buffer *buffer,
697 unsigned long ip, const char *fmt, ...);
698void trace_printk_seq(struct trace_seq *s);
699enum print_line_t print_trace_line(struct trace_iterator *iter);
700
701extern unsigned long trace_flags;
702
703
704#ifdef CONFIG_FUNCTION_GRAPH_TRACER
705
706
707#define TRACE_GRAPH_PRINT_OVERRUN 0x1
708#define TRACE_GRAPH_PRINT_CPU 0x2
709#define TRACE_GRAPH_PRINT_OVERHEAD 0x4
710#define TRACE_GRAPH_PRINT_PROC 0x8
711#define TRACE_GRAPH_PRINT_DURATION 0x10
712#define TRACE_GRAPH_PRINT_ABS_TIME 0x20
713
714extern enum print_line_t
715print_graph_function_flags(struct trace_iterator *iter, u32 flags);
716extern void print_graph_headers_flags(struct seq_file *s, u32 flags);
717extern enum print_line_t
718trace_print_graph_duration(unsigned long long duration, struct trace_seq *s);
719extern void graph_trace_open(struct trace_iterator *iter);
720extern void graph_trace_close(struct trace_iterator *iter);
721extern int __trace_graph_entry(struct trace_array *tr,
722 struct ftrace_graph_ent *trace,
723 unsigned long flags, int pc);
724extern void __trace_graph_return(struct trace_array *tr,
725 struct ftrace_graph_ret *trace,
726 unsigned long flags, int pc);
727
728
729#ifdef CONFIG_DYNAMIC_FTRACE
730
731#define FTRACE_GRAPH_MAX_FUNCS 32
732extern int ftrace_graph_filter_enabled;
733extern int ftrace_graph_count;
734extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS];
735
736static inline int ftrace_graph_addr(unsigned long addr)
737{
738 int i;
739
740 if (!ftrace_graph_filter_enabled)
741 return 1;
742
743 for (i = 0; i < ftrace_graph_count; i++) {
744 if (addr == ftrace_graph_funcs[i]) {
745
746
747
748
749
750 if (in_irq())
751 trace_recursion_set(TRACE_IRQ_BIT);
752 else
753 trace_recursion_clear(TRACE_IRQ_BIT);
754 return 1;
755 }
756 }
757
758 return 0;
759}
760#else
761static inline int ftrace_graph_addr(unsigned long addr)
762{
763 return 1;
764}
765#endif
766#else
767static inline enum print_line_t
768print_graph_function_flags(struct trace_iterator *iter, u32 flags)
769{
770 return TRACE_TYPE_UNHANDLED;
771}
772#endif
773
774extern struct list_head ftrace_pids;
775
776#ifdef CONFIG_FUNCTION_TRACER
777static inline int ftrace_trace_task(struct task_struct *task)
778{
779 if (list_empty(&ftrace_pids))
780 return 1;
781
782 return test_tsk_trace_trace(task);
783}
784extern int ftrace_is_dead(void);
785#else
786static inline int ftrace_trace_task(struct task_struct *task)
787{
788 return 1;
789}
790static inline int ftrace_is_dead(void) { return 0; }
791#endif
792
793int ftrace_event_is_function(struct ftrace_event_call *call);
794
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801
802struct trace_parser {
803 bool cont;
804 char *buffer;
805 unsigned idx;
806 unsigned size;
807};
808
809static inline bool trace_parser_loaded(struct trace_parser *parser)
810{
811 return (parser->idx != 0);
812}
813
814static inline bool trace_parser_cont(struct trace_parser *parser)
815{
816 return parser->cont;
817}
818
819static inline void trace_parser_clear(struct trace_parser *parser)
820{
821 parser->cont = false;
822 parser->idx = 0;
823}
824
825extern int trace_parser_get_init(struct trace_parser *parser, int size);
826extern void trace_parser_put(struct trace_parser *parser);
827extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
828 size_t cnt, loff_t *ppos);
829
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836
837enum trace_iterator_flags {
838 TRACE_ITER_PRINT_PARENT = 0x01,
839 TRACE_ITER_SYM_OFFSET = 0x02,
840 TRACE_ITER_SYM_ADDR = 0x04,
841 TRACE_ITER_VERBOSE = 0x08,
842 TRACE_ITER_RAW = 0x10,
843 TRACE_ITER_HEX = 0x20,
844 TRACE_ITER_BIN = 0x40,
845 TRACE_ITER_BLOCK = 0x80,
846 TRACE_ITER_STACKTRACE = 0x100,
847 TRACE_ITER_PRINTK = 0x200,
848 TRACE_ITER_PREEMPTONLY = 0x400,
849 TRACE_ITER_BRANCH = 0x800,
850 TRACE_ITER_ANNOTATE = 0x1000,
851 TRACE_ITER_USERSTACKTRACE = 0x2000,
852 TRACE_ITER_SYM_USEROBJ = 0x4000,
853 TRACE_ITER_PRINTK_MSGONLY = 0x8000,
854 TRACE_ITER_CONTEXT_INFO = 0x10000,
855 TRACE_ITER_LATENCY_FMT = 0x20000,
856 TRACE_ITER_SLEEP_TIME = 0x40000,
857 TRACE_ITER_GRAPH_TIME = 0x80000,
858 TRACE_ITER_RECORD_CMD = 0x100000,
859 TRACE_ITER_OVERWRITE = 0x200000,
860 TRACE_ITER_STOP_ON_FREE = 0x400000,
861 TRACE_ITER_IRQ_INFO = 0x800000,
862 TRACE_ITER_MARKERS = 0x1000000,
863 TRACE_ITER_FUNCTION = 0x2000000,
864};
865
866
867
868
869
870#define TRACE_ITER_SYM_MASK \
871 (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR)
872
873extern struct tracer nop_trace;
874
875#ifdef CONFIG_BRANCH_TRACER
876extern int enable_branch_tracing(struct trace_array *tr);
877extern void disable_branch_tracing(void);
878static inline int trace_branch_enable(struct trace_array *tr)
879{
880 if (trace_flags & TRACE_ITER_BRANCH)
881 return enable_branch_tracing(tr);
882 return 0;
883}
884static inline void trace_branch_disable(void)
885{
886
887 disable_branch_tracing();
888}
889#else
890static inline int trace_branch_enable(struct trace_array *tr)
891{
892 return 0;
893}
894static inline void trace_branch_disable(void)
895{
896}
897#endif
898
899
900int tracing_update_buffers(void);
901
902
903enum {
904 TRACE_EVENT_TYPE_PRINTF = 1,
905 TRACE_EVENT_TYPE_RAW = 2,
906};
907
908struct ftrace_event_field {
909 struct list_head link;
910 const char *name;
911 const char *type;
912 int filter_type;
913 int offset;
914 int size;
915 int is_signed;
916};
917
918struct event_filter {
919 int n_preds;
920 int a_preds;
921 struct filter_pred *preds;
922 struct filter_pred *root;
923 char *filter_string;
924};
925
926struct event_subsystem {
927 struct list_head list;
928 const char *name;
929 struct event_filter *filter;
930 int ref_count;
931};
932
933struct ftrace_subsystem_dir {
934 struct list_head list;
935 struct event_subsystem *subsystem;
936 struct trace_array *tr;
937 struct dentry *entry;
938 int ref_count;
939 int nr_events;
940};
941
942#define FILTER_PRED_INVALID ((unsigned short)-1)
943#define FILTER_PRED_IS_RIGHT (1 << 15)
944#define FILTER_PRED_FOLD (1 << 15)
945
946
947
948
949
950
951
952
953#define MAX_FILTER_PRED 16384
954
955struct filter_pred;
956struct regex;
957
958typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event);
959
960typedef int (*regex_match_func)(char *str, struct regex *r, int len);
961
962enum regex_type {
963 MATCH_FULL = 0,
964 MATCH_FRONT_ONLY,
965 MATCH_MIDDLE_ONLY,
966 MATCH_END_ONLY,
967};
968
969struct regex {
970 char pattern[MAX_FILTER_STR_VAL];
971 int len;
972 int field_len;
973 regex_match_func match;
974};
975
976struct filter_pred {
977 filter_pred_fn_t fn;
978 u64 val;
979 struct regex regex;
980 unsigned short *ops;
981 struct ftrace_event_field *field;
982 int offset;
983 int not;
984 int op;
985 unsigned short index;
986 unsigned short parent;
987 unsigned short left;
988 unsigned short right;
989};
990
991extern enum regex_type
992filter_parse_regex(char *buff, int len, char **search, int *not);
993extern void print_event_filter(struct ftrace_event_call *call,
994 struct trace_seq *s);
995extern int apply_event_filter(struct ftrace_event_call *call,
996 char *filter_string);
997extern int apply_subsystem_event_filter(struct ftrace_subsystem_dir *dir,
998 char *filter_string);
999extern void print_subsystem_event_filter(struct event_subsystem *system,
1000 struct trace_seq *s);
1001extern int filter_assign_type(const char *type);
1002
1003struct ftrace_event_field *
1004trace_find_event_field(struct ftrace_event_call *call, char *name);
1005
1006static inline int
1007filter_check_discard(struct ftrace_event_call *call, void *rec,
1008 struct ring_buffer *buffer,
1009 struct ring_buffer_event *event)
1010{
1011 if (unlikely(call->flags & TRACE_EVENT_FL_FILTERED) &&
1012 !filter_match_preds(call->filter, rec)) {
1013 ring_buffer_discard_commit(buffer, event);
1014 return 1;
1015 }
1016
1017 return 0;
1018}
1019
1020extern void trace_event_enable_cmd_record(bool enable);
1021extern int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr);
1022extern int event_trace_del_tracer(struct trace_array *tr);
1023
1024extern struct mutex event_mutex;
1025extern struct list_head ftrace_events;
1026
1027extern const char *__start___trace_bprintk_fmt[];
1028extern const char *__stop___trace_bprintk_fmt[];
1029
1030void trace_printk_init_buffers(void);
1031void trace_printk_start_comm(void);
1032int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set);
1033int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled);
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044#define internal_trace_puts(str) __trace_puts(_THIS_IP_, str, strlen(str))
1045
1046#undef FTRACE_ENTRY
1047#define FTRACE_ENTRY(call, struct_name, id, tstruct, print, filter) \
1048 extern struct ftrace_event_call \
1049 __attribute__((__aligned__(4))) event_##call;
1050#undef FTRACE_ENTRY_DUP
1051#define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print, filter) \
1052 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \
1053 filter)
1054#include "trace_entries.h"
1055
1056#if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER)
1057int perf_ftrace_event_register(struct ftrace_event_call *call,
1058 enum trace_reg type, void *data);
1059#else
1060#define perf_ftrace_event_register NULL
1061#endif
1062
1063#endif
1064