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 <trace/boot.h>
13#include <linux/kmemtrace.h>
14
15#include <linux/trace_seq.h>
16#include <linux/ftrace_event.h>
17
18enum trace_type {
19 __TRACE_FIRST_TYPE = 0,
20
21 TRACE_FN,
22 TRACE_CTX,
23 TRACE_WAKE,
24 TRACE_STACK,
25 TRACE_PRINT,
26 TRACE_BPRINT,
27 TRACE_SPECIAL,
28 TRACE_MMIO_RW,
29 TRACE_MMIO_MAP,
30 TRACE_BRANCH,
31 TRACE_BOOT_CALL,
32 TRACE_BOOT_RET,
33 TRACE_GRAPH_RET,
34 TRACE_GRAPH_ENT,
35 TRACE_USER_STACK,
36 TRACE_HW_BRANCHES,
37 TRACE_KMEM_ALLOC,
38 TRACE_KMEM_FREE,
39 TRACE_BLK,
40
41 __TRACE_LAST_TYPE,
42};
43
44enum kmemtrace_type_id {
45 KMEMTRACE_TYPE_KMALLOC = 0,
46 KMEMTRACE_TYPE_CACHE,
47 KMEMTRACE_TYPE_PAGES,
48};
49
50extern struct tracer boot_tracer;
51
52#undef __field
53#define __field(type, item) type item;
54
55#undef __field_struct
56#define __field_struct(type, item) __field(type, item)
57
58#undef __field_desc
59#define __field_desc(type, container, item)
60
61#undef __array
62#define __array(type, item, size) type item[size];
63
64#undef __array_desc
65#define __array_desc(type, container, item, size)
66
67#undef __dynamic_array
68#define __dynamic_array(type, item) type item[];
69
70#undef F_STRUCT
71#define F_STRUCT(args...) args
72
73#undef FTRACE_ENTRY
74#define FTRACE_ENTRY(name, struct_name, id, tstruct, print) \
75 struct struct_name { \
76 struct trace_entry ent; \
77 tstruct \
78 }
79
80#undef TP_ARGS
81#define TP_ARGS(args...) args
82
83#undef FTRACE_ENTRY_DUP
84#define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk)
85
86#include "trace_entries.h"
87
88
89
90
91
92struct syscall_trace_enter {
93 struct trace_entry ent;
94 int nr;
95 unsigned long args[];
96};
97
98struct syscall_trace_exit {
99 struct trace_entry ent;
100 int nr;
101 unsigned long ret;
102};
103
104
105
106
107
108
109
110
111
112
113enum trace_flag_type {
114 TRACE_FLAG_IRQS_OFF = 0x01,
115 TRACE_FLAG_IRQS_NOSUPPORT = 0x02,
116 TRACE_FLAG_NEED_RESCHED = 0x04,
117 TRACE_FLAG_HARDIRQ = 0x08,
118 TRACE_FLAG_SOFTIRQ = 0x10,
119};
120
121#define TRACE_BUF_SIZE 1024
122
123
124
125
126
127
128struct trace_array_cpu {
129 atomic_t disabled;
130 void *buffer_page;
131
132 unsigned long saved_latency;
133 unsigned long critical_start;
134 unsigned long critical_end;
135 unsigned long critical_sequence;
136 unsigned long nice;
137 unsigned long policy;
138 unsigned long rt_priority;
139 unsigned long skipped_entries;
140 cycle_t preempt_timestamp;
141 pid_t pid;
142 uid_t uid;
143 char comm[TASK_COMM_LEN];
144};
145
146
147
148
149
150
151struct trace_array {
152 struct ring_buffer *buffer;
153 unsigned long entries;
154 int cpu;
155 cycle_t time_start;
156 struct task_struct *waiter;
157 struct trace_array_cpu *data[NR_CPUS];
158};
159
160#define FTRACE_CMP_TYPE(var, type) \
161 __builtin_types_compatible_p(typeof(var), type *)
162
163#undef IF_ASSIGN
164#define IF_ASSIGN(var, entry, etype, id) \
165 if (FTRACE_CMP_TYPE(var, etype)) { \
166 var = (typeof(var))(entry); \
167 WARN_ON(id && (entry)->type != id); \
168 break; \
169 }
170
171
172extern void __ftrace_bad_type(void);
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187#define trace_assign_type(var, ent) \
188 do { \
189 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \
190 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \
191 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \
192 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\
193 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \
194 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \
195 IF_ASSIGN(var, ent, struct special_entry, 0); \
196 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \
197 TRACE_MMIO_RW); \
198 IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \
199 TRACE_MMIO_MAP); \
200 IF_ASSIGN(var, ent, struct trace_boot_call, TRACE_BOOT_CALL);\
201 IF_ASSIGN(var, ent, struct trace_boot_ret, TRACE_BOOT_RET);\
202 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \
203 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \
204 TRACE_GRAPH_ENT); \
205 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \
206 TRACE_GRAPH_RET); \
207 IF_ASSIGN(var, ent, struct hw_branch_entry, TRACE_HW_BRANCHES);\
208 IF_ASSIGN(var, ent, struct kmemtrace_alloc_entry, \
209 TRACE_KMEM_ALLOC); \
210 IF_ASSIGN(var, ent, struct kmemtrace_free_entry, \
211 TRACE_KMEM_FREE); \
212 __ftrace_bad_type(); \
213 } while (0)
214
215
216
217
218
219
220struct tracer_opt {
221 const char *name;
222 u32 bit;
223};
224
225
226
227
228
229struct tracer_flags {
230 u32 val;
231 struct tracer_opt *opts;
232};
233
234
235#define TRACER_OPT(s, b) .name = #s, .bit = b
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257struct tracer {
258 const char *name;
259 int (*init)(struct trace_array *tr);
260 void (*reset)(struct trace_array *tr);
261 void (*start)(struct trace_array *tr);
262 void (*stop)(struct trace_array *tr);
263 void (*open)(struct trace_iterator *iter);
264 void (*pipe_open)(struct trace_iterator *iter);
265 void (*wait_pipe)(struct trace_iterator *iter);
266 void (*close)(struct trace_iterator *iter);
267 ssize_t (*read)(struct trace_iterator *iter,
268 struct file *filp, char __user *ubuf,
269 size_t cnt, loff_t *ppos);
270 ssize_t (*splice_read)(struct trace_iterator *iter,
271 struct file *filp,
272 loff_t *ppos,
273 struct pipe_inode_info *pipe,
274 size_t len,
275 unsigned int flags);
276#ifdef CONFIG_FTRACE_STARTUP_TEST
277 int (*selftest)(struct tracer *trace,
278 struct trace_array *tr);
279#endif
280 void (*print_header)(struct seq_file *m);
281 enum print_line_t (*print_line)(struct trace_iterator *iter);
282
283 int (*set_flag)(u32 old_flags, u32 bit, int set);
284 struct tracer *next;
285 int print_max;
286 struct tracer_flags *flags;
287};
288
289
290#define TRACE_PIPE_ALL_CPU -1
291
292int tracer_init(struct tracer *t, struct trace_array *tr);
293int tracing_is_enabled(void);
294void trace_wake_up(void);
295void tracing_reset(struct trace_array *tr, int cpu);
296void tracing_reset_online_cpus(struct trace_array *tr);
297void tracing_reset_current(int cpu);
298void tracing_reset_current_online_cpus(void);
299int tracing_open_generic(struct inode *inode, struct file *filp);
300struct dentry *trace_create_file(const char *name,
301 mode_t mode,
302 struct dentry *parent,
303 void *data,
304 const struct file_operations *fops);
305
306struct dentry *tracing_init_dentry(void);
307void init_tracer_sysprof_debugfs(struct dentry *d_tracer);
308
309struct ring_buffer_event;
310
311struct ring_buffer_event *
312trace_buffer_lock_reserve(struct ring_buffer *buffer,
313 int type,
314 unsigned long len,
315 unsigned long flags,
316 int pc);
317void trace_buffer_unlock_commit(struct ring_buffer *buffer,
318 struct ring_buffer_event *event,
319 unsigned long flags, int pc);
320
321struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,
322 struct trace_array_cpu *data);
323
324struct trace_entry *trace_find_next_entry(struct trace_iterator *iter,
325 int *ent_cpu, u64 *ent_ts);
326
327void default_wait_pipe(struct trace_iterator *iter);
328void poll_wait_pipe(struct trace_iterator *iter);
329
330void ftrace(struct trace_array *tr,
331 struct trace_array_cpu *data,
332 unsigned long ip,
333 unsigned long parent_ip,
334 unsigned long flags, int pc);
335void tracing_sched_switch_trace(struct trace_array *tr,
336 struct task_struct *prev,
337 struct task_struct *next,
338 unsigned long flags, int pc);
339
340void tracing_sched_wakeup_trace(struct trace_array *tr,
341 struct task_struct *wakee,
342 struct task_struct *cur,
343 unsigned long flags, int pc);
344void trace_special(struct trace_array *tr,
345 struct trace_array_cpu *data,
346 unsigned long arg1,
347 unsigned long arg2,
348 unsigned long arg3, int pc);
349void trace_function(struct trace_array *tr,
350 unsigned long ip,
351 unsigned long parent_ip,
352 unsigned long flags, int pc);
353
354void trace_graph_return(struct ftrace_graph_ret *trace);
355int trace_graph_entry(struct ftrace_graph_ent *trace);
356void set_graph_array(struct trace_array *tr);
357
358void tracing_start_cmdline_record(void);
359void tracing_stop_cmdline_record(void);
360void tracing_sched_switch_assign_trace(struct trace_array *tr);
361void tracing_stop_sched_switch_record(void);
362void tracing_start_sched_switch_record(void);
363int register_tracer(struct tracer *type);
364void unregister_tracer(struct tracer *type);
365int is_tracing_stopped(void);
366
367extern unsigned long nsecs_to_usecs(unsigned long nsecs);
368
369#ifdef CONFIG_TRACER_MAX_TRACE
370extern unsigned long tracing_max_latency;
371extern unsigned long tracing_thresh;
372
373void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu);
374void update_max_tr_single(struct trace_array *tr,
375 struct task_struct *tsk, int cpu);
376#endif
377
378#ifdef CONFIG_STACKTRACE
379void ftrace_trace_stack(struct ring_buffer *buffer, unsigned long flags,
380 int skip, int pc);
381
382void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags,
383 int pc);
384
385void __trace_stack(struct trace_array *tr, unsigned long flags, int skip,
386 int pc);
387#else
388static inline void ftrace_trace_stack(struct trace_array *tr,
389 unsigned long flags, int skip, int pc)
390{
391}
392
393static inline void ftrace_trace_userstack(struct trace_array *tr,
394 unsigned long flags, int pc)
395{
396}
397
398static inline void __trace_stack(struct trace_array *tr, unsigned long flags,
399 int skip, int pc)
400{
401}
402#endif
403
404extern cycle_t ftrace_now(int cpu);
405
406extern void trace_find_cmdline(int pid, char comm[]);
407
408#ifdef CONFIG_DYNAMIC_FTRACE
409extern unsigned long ftrace_update_tot_cnt;
410#define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
411extern int DYN_FTRACE_TEST_NAME(void);
412#endif
413
414extern int ring_buffer_expanded;
415extern bool tracing_selftest_disabled;
416DECLARE_PER_CPU(local_t, ftrace_cpu_disabled);
417
418#ifdef CONFIG_FTRACE_STARTUP_TEST
419extern int trace_selftest_startup_function(struct tracer *trace,
420 struct trace_array *tr);
421extern int trace_selftest_startup_function_graph(struct tracer *trace,
422 struct trace_array *tr);
423extern int trace_selftest_startup_irqsoff(struct tracer *trace,
424 struct trace_array *tr);
425extern int trace_selftest_startup_preemptoff(struct tracer *trace,
426 struct trace_array *tr);
427extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace,
428 struct trace_array *tr);
429extern int trace_selftest_startup_wakeup(struct tracer *trace,
430 struct trace_array *tr);
431extern int trace_selftest_startup_nop(struct tracer *trace,
432 struct trace_array *tr);
433extern int trace_selftest_startup_sched_switch(struct tracer *trace,
434 struct trace_array *tr);
435extern int trace_selftest_startup_sysprof(struct tracer *trace,
436 struct trace_array *tr);
437extern int trace_selftest_startup_branch(struct tracer *trace,
438 struct trace_array *tr);
439extern int trace_selftest_startup_hw_branches(struct tracer *trace,
440 struct trace_array *tr);
441#endif
442
443extern void *head_page(struct trace_array_cpu *data);
444extern unsigned long long ns2usecs(cycle_t nsec);
445extern int
446trace_vbprintk(unsigned long ip, const char *fmt, va_list args);
447extern int
448trace_vprintk(unsigned long ip, const char *fmt, va_list args);
449extern int
450trace_array_vprintk(struct trace_array *tr,
451 unsigned long ip, const char *fmt, va_list args);
452int trace_array_printk(struct trace_array *tr,
453 unsigned long ip, const char *fmt, ...);
454
455extern unsigned long trace_flags;
456
457extern int trace_clock_id;
458
459
460#ifdef CONFIG_FUNCTION_GRAPH_TRACER
461extern enum print_line_t print_graph_function(struct trace_iterator *iter);
462extern enum print_line_t
463trace_print_graph_duration(unsigned long long duration, struct trace_seq *s);
464
465#ifdef CONFIG_DYNAMIC_FTRACE
466
467#define FTRACE_GRAPH_MAX_FUNCS 32
468extern int ftrace_graph_count;
469extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS];
470
471static inline int ftrace_graph_addr(unsigned long addr)
472{
473 int i;
474
475 if (!ftrace_graph_count || test_tsk_trace_graph(current))
476 return 1;
477
478 for (i = 0; i < ftrace_graph_count; i++) {
479 if (addr == ftrace_graph_funcs[i])
480 return 1;
481 }
482
483 return 0;
484}
485#else
486static inline int ftrace_trace_addr(unsigned long addr)
487{
488 return 1;
489}
490static inline int ftrace_graph_addr(unsigned long addr)
491{
492 return 1;
493}
494#endif
495#else
496static inline enum print_line_t
497print_graph_function(struct trace_iterator *iter)
498{
499 return TRACE_TYPE_UNHANDLED;
500}
501#endif
502
503extern struct pid *ftrace_pid_trace;
504
505#ifdef CONFIG_FUNCTION_TRACER
506static inline int ftrace_trace_task(struct task_struct *task)
507{
508 if (!ftrace_pid_trace)
509 return 1;
510
511 return test_tsk_trace_trace(task);
512}
513#else
514static inline int ftrace_trace_task(struct task_struct *task)
515{
516 return 1;
517}
518#endif
519
520
521
522
523
524
525
526
527struct trace_parser {
528 bool cont;
529 char *buffer;
530 unsigned idx;
531 unsigned size;
532};
533
534static inline bool trace_parser_loaded(struct trace_parser *parser)
535{
536 return (parser->idx != 0);
537}
538
539static inline bool trace_parser_cont(struct trace_parser *parser)
540{
541 return parser->cont;
542}
543
544static inline void trace_parser_clear(struct trace_parser *parser)
545{
546 parser->cont = false;
547 parser->idx = 0;
548}
549
550extern int trace_parser_get_init(struct trace_parser *parser, int size);
551extern void trace_parser_put(struct trace_parser *parser);
552extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
553 size_t cnt, loff_t *ppos);
554
555
556
557
558
559
560
561
562enum trace_iterator_flags {
563 TRACE_ITER_PRINT_PARENT = 0x01,
564 TRACE_ITER_SYM_OFFSET = 0x02,
565 TRACE_ITER_SYM_ADDR = 0x04,
566 TRACE_ITER_VERBOSE = 0x08,
567 TRACE_ITER_RAW = 0x10,
568 TRACE_ITER_HEX = 0x20,
569 TRACE_ITER_BIN = 0x40,
570 TRACE_ITER_BLOCK = 0x80,
571 TRACE_ITER_STACKTRACE = 0x100,
572 TRACE_ITER_SCHED_TREE = 0x200,
573 TRACE_ITER_PRINTK = 0x400,
574 TRACE_ITER_PREEMPTONLY = 0x800,
575 TRACE_ITER_BRANCH = 0x1000,
576 TRACE_ITER_ANNOTATE = 0x2000,
577 TRACE_ITER_USERSTACKTRACE = 0x4000,
578 TRACE_ITER_SYM_USEROBJ = 0x8000,
579 TRACE_ITER_PRINTK_MSGONLY = 0x10000,
580 TRACE_ITER_CONTEXT_INFO = 0x20000,
581 TRACE_ITER_LATENCY_FMT = 0x40000,
582 TRACE_ITER_SLEEP_TIME = 0x80000,
583 TRACE_ITER_GRAPH_TIME = 0x100000,
584};
585
586
587
588
589
590#define TRACE_ITER_SYM_MASK \
591 (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR)
592
593extern struct tracer nop_trace;
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614static inline int ftrace_preempt_disable(void)
615{
616 int resched;
617
618 resched = need_resched();
619 preempt_disable_notrace();
620
621 return resched;
622}
623
624
625
626
627
628
629
630
631
632
633
634
635static inline void ftrace_preempt_enable(int resched)
636{
637 if (resched)
638 preempt_enable_no_resched_notrace();
639 else
640 preempt_enable_notrace();
641}
642
643#ifdef CONFIG_BRANCH_TRACER
644extern int enable_branch_tracing(struct trace_array *tr);
645extern void disable_branch_tracing(void);
646static inline int trace_branch_enable(struct trace_array *tr)
647{
648 if (trace_flags & TRACE_ITER_BRANCH)
649 return enable_branch_tracing(tr);
650 return 0;
651}
652static inline void trace_branch_disable(void)
653{
654
655 disable_branch_tracing();
656}
657#else
658static inline int trace_branch_enable(struct trace_array *tr)
659{
660 return 0;
661}
662static inline void trace_branch_disable(void)
663{
664}
665#endif
666
667
668int tracing_update_buffers(void);
669
670
671enum {
672 TRACE_EVENT_TYPE_PRINTF = 1,
673 TRACE_EVENT_TYPE_RAW = 2,
674};
675
676struct ftrace_event_field {
677 struct list_head link;
678 char *name;
679 char *type;
680 int filter_type;
681 int offset;
682 int size;
683 int is_signed;
684};
685
686struct event_filter {
687 int n_preds;
688 struct filter_pred **preds;
689 char *filter_string;
690 bool no_reset;
691};
692
693struct event_subsystem {
694 struct list_head list;
695 const char *name;
696 struct dentry *entry;
697 struct event_filter *filter;
698 int nr_events;
699};
700
701struct filter_pred;
702
703typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event,
704 int val1, int val2);
705
706struct filter_pred {
707 filter_pred_fn_t fn;
708 u64 val;
709 char str_val[MAX_FILTER_STR_VAL];
710 int str_len;
711 char *field_name;
712 int offset;
713 int not;
714 int op;
715 int pop_n;
716};
717
718extern void print_event_filter(struct ftrace_event_call *call,
719 struct trace_seq *s);
720extern int apply_event_filter(struct ftrace_event_call *call,
721 char *filter_string);
722extern int apply_subsystem_event_filter(struct event_subsystem *system,
723 char *filter_string);
724extern void print_subsystem_event_filter(struct event_subsystem *system,
725 struct trace_seq *s);
726extern int filter_assign_type(const char *type);
727
728static inline int
729filter_check_discard(struct ftrace_event_call *call, void *rec,
730 struct ring_buffer *buffer,
731 struct ring_buffer_event *event)
732{
733 if (unlikely(call->filter_active) && !filter_match_preds(call, rec)) {
734 ring_buffer_discard_commit(buffer, event);
735 return 1;
736 }
737
738 return 0;
739}
740
741extern struct mutex event_mutex;
742extern struct list_head ftrace_events;
743
744extern const char *__start___trace_bprintk_fmt[];
745extern const char *__stop___trace_bprintk_fmt[];
746
747#undef FTRACE_ENTRY
748#define FTRACE_ENTRY(call, struct_name, id, tstruct, print) \
749 extern struct ftrace_event_call event_##call;
750#undef FTRACE_ENTRY_DUP
751#define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print) \
752 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print))
753#include "trace_entries.h"
754
755#endif
756