1 #ifndef _LINUX_KERNEL_TRACE_H
2 #define _LINUX_KERNEL_TRACE_H
3
4 #include <linux/fs.h>
5 #include <linux/atomic.h>
6 #include <linux/sched.h>
7 #include <linux/clocksource.h>
8 #include <linux/ring_buffer.h>
9 #include <linux/mmiotrace.h>
10 #include <linux/tracepoint.h>
11 #include <linux/ftrace.h>
12 #include <linux/hw_breakpoint.h>
13 #include <linux/trace_seq.h>
14 #include <linux/ftrace_event.h>
15
16 enum trace_type {
17 __TRACE_FIRST_TYPE = 0,
18
19 TRACE_FN,
20 TRACE_CTX,
21 TRACE_WAKE,
22 TRACE_STACK,
23 TRACE_PRINT,
24 TRACE_BPRINT,
25 TRACE_MMIO_RW,
26 TRACE_MMIO_MAP,
27 TRACE_BRANCH,
28 TRACE_GRAPH_RET,
29 TRACE_GRAPH_ENT,
30 TRACE_USER_STACK,
31 TRACE_BLK,
32
33 __TRACE_LAST_TYPE,
34 };
35
36
37 #undef __field
38 #define __field(type, item) type item;
39
40 #undef __field_struct
41 #define __field_struct(type, item) __field(type, item)
42
43 #undef __field_desc
44 #define __field_desc(type, container, item)
45
46 #undef __array
47 #define __array(type, item, size) type item[size];
48
49 #undef __array_desc
50 #define __array_desc(type, container, item, size)
51
52 #undef __dynamic_array
53 #define __dynamic_array(type, item) type item[];
54
55 #undef F_STRUCT
56 #define F_STRUCT(args...) args
57
58 #undef FTRACE_ENTRY
59 #define FTRACE_ENTRY(name, struct_name, id, tstruct, print, filter) \
60 struct struct_name { \
61 struct trace_entry ent; \
62 tstruct \
63 }
64
65 #undef TP_ARGS
66 #define TP_ARGS(args...) args
67
68 #undef FTRACE_ENTRY_DUP
69 #define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk, filter)
70
71 #undef FTRACE_ENTRY_REG
72 #define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, \
73 filter, regfn) \
74 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \
75 filter)
76
77 #include "trace_entries.h"
78
79 /*
80 * syscalls are special, and need special handling, this is why
81 * they are not included in trace_entries.h
82 */
83 struct syscall_trace_enter {
84 struct trace_entry ent;
85 int nr;
86 unsigned long args[];
87 };
88
89 struct syscall_trace_exit {
90 struct trace_entry ent;
91 int nr;
92 long ret;
93 };
94
95 struct kprobe_trace_entry_head {
96 struct trace_entry ent;
97 unsigned long ip;
98 };
99
100 struct kretprobe_trace_entry_head {
101 struct trace_entry ent;
102 unsigned long func;
103 unsigned long ret_ip;
104 };
105
106 /*
107 * trace_flag_type is an enumeration that holds different
108 * states when a trace occurs. These are:
109 * IRQS_OFF - interrupts were disabled
110 * IRQS_NOSUPPORT - arch does not support irqs_disabled_flags
111 * NEED_RESCHED - reschedule is requested
112 * HARDIRQ - inside an interrupt handler
113 * SOFTIRQ - inside a softirq handler
114 */
115 enum trace_flag_type {
116 TRACE_FLAG_IRQS_OFF = 0x01,
117 TRACE_FLAG_IRQS_NOSUPPORT = 0x02,
118 TRACE_FLAG_NEED_RESCHED = 0x04,
119 TRACE_FLAG_HARDIRQ = 0x08,
120 TRACE_FLAG_SOFTIRQ = 0x10,
121 };
122
123 #define TRACE_BUF_SIZE 1024
124
125 /*
126 * The CPU trace array - it consists of thousands of trace entries
127 * plus some other descriptor data: (for example which task started
128 * the trace, etc.)
129 */
130 struct trace_array_cpu {
131 atomic_t disabled;
132 void *buffer_page; /* ring buffer spare */
133
134 unsigned long saved_latency;
135 unsigned long critical_start;
136 unsigned long critical_end;
137 unsigned long critical_sequence;
138 unsigned long nice;
139 unsigned long policy;
140 unsigned long rt_priority;
141 unsigned long skipped_entries;
142 cycle_t preempt_timestamp;
143 pid_t pid;
144 uid_t uid;
145 char comm[TASK_COMM_LEN];
146 };
147
148 /*
149 * The trace array - an array of per-CPU trace arrays. This is the
150 * highest level data structure that individual tracers deal with.
151 * They have on/off state as well:
152 */
153 struct trace_array {
154 struct ring_buffer *buffer;
155 unsigned long entries;
156 int cpu;
157 int buffer_disabled;
158 cycle_t time_start;
159 struct task_struct *waiter;
160 struct trace_array_cpu *data[NR_CPUS];
161 };
162
163 #define FTRACE_CMP_TYPE(var, type) \
164 __builtin_types_compatible_p(typeof(var), type *)
165
166 #undef IF_ASSIGN
167 #define IF_ASSIGN(var, entry, etype, id) \
168 if (FTRACE_CMP_TYPE(var, etype)) { \
169 var = (typeof(var))(entry); \
170 WARN_ON(id && (entry)->type != id); \
171 break; \
172 }
173
174 /* Will cause compile errors if type is not found. */
175 extern void __ftrace_bad_type(void);
176
177 /*
178 * The trace_assign_type is a verifier that the entry type is
179 * the same as the type being assigned. To add new types simply
180 * add a line with the following format:
181 *
182 * IF_ASSIGN(var, ent, type, id);
183 *
184 * Where "type" is the trace type that includes the trace_entry
185 * as the "ent" item. And "id" is the trace identifier that is
186 * used in the trace_type enum.
187 *
188 * If the type can have more than one id, then use zero.
189 */
190 #define trace_assign_type(var, ent) \
191 do { \
192 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \
193 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \
194 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \
195 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\
196 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \
197 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \
198 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \
199 TRACE_MMIO_RW); \
200 IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \
201 TRACE_MMIO_MAP); \
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 __ftrace_bad_type(); \
208 } while (0)
209
210 /*
211 * An option specific to a tracer. This is a boolean value.
212 * The bit is the bit index that sets its value on the
213 * flags value in struct tracer_flags.
214 */
215 struct tracer_opt {
216 const char *name; /* Will appear on the trace_options file */
217 u32 bit; /* Mask assigned in val field in tracer_flags */
218 };
219
220 /*
221 * The set of specific options for a tracer. Your tracer
222 * have to set the initial value of the flags val.
223 */
224 struct tracer_flags {
225 u32 val;
226 struct tracer_opt *opts;
227 };
228
229 /* Makes more easy to define a tracer opt */
230 #define TRACER_OPT(s, b) .name = #s, .bit = b
231
232
233 /**
234 * struct tracer - a specific tracer and its callbacks to interact with debugfs
235 * @name: the name chosen to select it on the available_tracers file
236 * @init: called when one switches to this tracer (echo name > current_tracer)
237 * @reset: called when one switches to another tracer
238 * @start: called when tracing is unpaused (echo 1 > tracing_enabled)
239 * @stop: called when tracing is paused (echo 0 > tracing_enabled)
240 * @open: called when the trace file is opened
241 * @pipe_open: called when the trace_pipe file is opened
242 * @wait_pipe: override how the user waits for traces on trace_pipe
243 * @close: called when the trace file is released
244 * @pipe_close: called when the trace_pipe file is released
245 * @read: override the default read callback on trace_pipe
246 * @splice_read: override the default splice_read callback on trace_pipe
247 * @selftest: selftest to run on boot (see trace_selftest.c)
248 * @print_headers: override the first lines that describe your columns
249 * @print_line: callback that prints a trace
250 * @set_flag: signals one of your private flags changed (trace_options file)
251 * @flags: your private flags
252 */
253 struct tracer {
254 const char *name;
255 int (*init)(struct trace_array *tr);
256 void (*reset)(struct trace_array *tr);
257 void (*start)(struct trace_array *tr);
258 void (*stop)(struct trace_array *tr);
259 void (*open)(struct trace_iterator *iter);
260 void (*pipe_open)(struct trace_iterator *iter);
261 void (*wait_pipe)(struct trace_iterator *iter);
262 void (*close)(struct trace_iterator *iter);
263 void (*pipe_close)(struct trace_iterator *iter);
264 ssize_t (*read)(struct trace_iterator *iter,
265 struct file *filp, char __user *ubuf,
266 size_t cnt, loff_t *ppos);
267 ssize_t (*splice_read)(struct trace_iterator *iter,
268 struct file *filp,
269 loff_t *ppos,
270 struct pipe_inode_info *pipe,
271 size_t len,
272 unsigned int flags);
273 #ifdef CONFIG_FTRACE_STARTUP_TEST
274 int (*selftest)(struct tracer *trace,
275 struct trace_array *tr);
276 #endif
277 void (*print_header)(struct seq_file *m);
278 enum print_line_t (*print_line)(struct trace_iterator *iter);
279 /* If you handled the flag setting, return 0 */
280 int (*set_flag)(u32 old_flags, u32 bit, int set);
281 /* Return 0 if OK with change, else return non-zero */
282 int (*flag_changed)(struct tracer *tracer,
283 u32 mask, int set);
284 struct tracer *next;
285 struct tracer_flags *flags;
286 int print_max;
287 int use_max_tr;
288 bool enabled;
289 };
290
291
292 /* Only current can touch trace_recursion */
293 #define trace_recursion_inc() do { (current)->trace_recursion++; } while (0)
294 #define trace_recursion_dec() do { (current)->trace_recursion--; } while (0)
295
296 /* Ring buffer has the 10 LSB bits to count */
297 #define trace_recursion_buffer() ((current)->trace_recursion & 0x3ff)
298
299 /* for function tracing recursion */
300 #define TRACE_INTERNAL_BIT (1<<11)
301 #define TRACE_GLOBAL_BIT (1<<12)
302 #define TRACE_CONTROL_BIT (1<<13)
303
304 /*
305 * Abuse of the trace_recursion.
306 * As we need a way to maintain state if we are tracing the function
307 * graph in irq because we want to trace a particular function that
308 * was called in irq context but we have irq tracing off. Since this
309 * can only be modified by current, we can reuse trace_recursion.
310 */
311 #define TRACE_IRQ_BIT (1<<13)
312
313 #define trace_recursion_set(bit) do { (current)->trace_recursion |= (bit); } while (0)
314 #define trace_recursion_clear(bit) do { (current)->trace_recursion &= ~(bit); } while (0)
315 #define trace_recursion_test(bit) ((current)->trace_recursion & (bit))
316
317 #define TRACE_PIPE_ALL_CPU -1
318
319 int tracer_init(struct tracer *t, struct trace_array *tr);
320 int tracing_is_enabled(void);
321 void trace_wake_up(void);
322 void tracing_reset(struct trace_array *tr, int cpu);
323 void tracing_reset_online_cpus(struct trace_array *tr);
324 void tracing_reset_current(int cpu);
325 void tracing_reset_current_online_cpus(void);
326 int tracing_open_generic(struct inode *inode, struct file *filp);
327 struct dentry *trace_create_file(const char *name,
328 umode_t mode,
329 struct dentry *parent,
330 void *data,
331 const struct file_operations *fops);
332
333 struct dentry *tracing_init_dentry(void);
334
335 struct ring_buffer_event;
336
337 struct ring_buffer_event *
338 trace_buffer_lock_reserve(struct ring_buffer *buffer,
339 int type,
340 unsigned long len,
341 unsigned long flags,
342 int pc);
343 void trace_buffer_unlock_commit(struct ring_buffer *buffer,
344 struct ring_buffer_event *event,
345 unsigned long flags, int pc);
346
347 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,
348 struct trace_array_cpu *data);
349
350 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter,
351 int *ent_cpu, u64 *ent_ts);
352
353 int trace_empty(struct trace_iterator *iter);
354
355 void *trace_find_next_entry_inc(struct trace_iterator *iter);
356
357 void trace_init_global_iter(struct trace_iterator *iter);
358
359 void tracing_iter_reset(struct trace_iterator *iter, int cpu);
360
361 void default_wait_pipe(struct trace_iterator *iter);
362 void poll_wait_pipe(struct trace_iterator *iter);
363
364 void ftrace(struct trace_array *tr,
365 struct trace_array_cpu *data,
366 unsigned long ip,
367 unsigned long parent_ip,
368 unsigned long flags, int pc);
369 void tracing_sched_switch_trace(struct trace_array *tr,
370 struct task_struct *prev,
371 struct task_struct *next,
372 unsigned long flags, int pc);
373
374 void tracing_sched_wakeup_trace(struct trace_array *tr,
375 struct task_struct *wakee,
376 struct task_struct *cur,
377 unsigned long flags, int pc);
378 void trace_function(struct trace_array *tr,
379 unsigned long ip,
380 unsigned long parent_ip,
381 unsigned long flags, int pc);
382 void trace_graph_function(struct trace_array *tr,
383 unsigned long ip,
384 unsigned long parent_ip,
385 unsigned long flags, int pc);
386 void trace_latency_header(struct seq_file *m);
387 void trace_default_header(struct seq_file *m);
388 void print_trace_header(struct seq_file *m, struct trace_iterator *iter);
389 int trace_empty(struct trace_iterator *iter);
390
391 void trace_graph_return(struct ftrace_graph_ret *trace);
392 int trace_graph_entry(struct ftrace_graph_ent *trace);
393 void set_graph_array(struct trace_array *tr);
394
395 void tracing_start_cmdline_record(void);
396 void tracing_stop_cmdline_record(void);
397 void tracing_sched_switch_assign_trace(struct trace_array *tr);
398 void tracing_stop_sched_switch_record(void);
399 void tracing_start_sched_switch_record(void);
400 int register_tracer(struct tracer *type);
401 void unregister_tracer(struct tracer *type);
402 int is_tracing_stopped(void);
403 enum trace_file_type {
404 TRACE_FILE_LAT_FMT = 1,
405 TRACE_FILE_ANNOTATE = 2,
406 };
407
408 extern cpumask_var_t __read_mostly tracing_buffer_mask;
409
410 #define for_each_tracing_cpu(cpu) \
411 for_each_cpu(cpu, tracing_buffer_mask)
412
413 extern unsigned long nsecs_to_usecs(unsigned long nsecs);
414
415 extern unsigned long tracing_thresh;
416
417 #ifdef CONFIG_TRACER_MAX_TRACE
418 extern unsigned long tracing_max_latency;
419
420 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu);
421 void update_max_tr_single(struct trace_array *tr,
422 struct task_struct *tsk, int cpu);
423 #endif /* CONFIG_TRACER_MAX_TRACE */
424
425 #ifdef CONFIG_STACKTRACE
426 void ftrace_trace_stack(struct ring_buffer *buffer, unsigned long flags,
427 int skip, int pc);
428
429 void ftrace_trace_stack_regs(struct ring_buffer *buffer, unsigned long flags,
430 int skip, int pc, struct pt_regs *regs);
431
432 void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags,
433 int pc);
434
435 void __trace_stack(struct trace_array *tr, unsigned long flags, int skip,
436 int pc);
437 #else
ftrace_trace_stack(struct ring_buffer * buffer,unsigned long flags,int skip,int pc)438 static inline void ftrace_trace_stack(struct ring_buffer *buffer,
439 unsigned long flags, int skip, int pc)
440 {
441 }
442
ftrace_trace_stack_regs(struct ring_buffer * buffer,unsigned long flags,int skip,int pc,struct pt_regs * regs)443 static inline void ftrace_trace_stack_regs(struct ring_buffer *buffer,
444 unsigned long flags, int skip,
445 int pc, struct pt_regs *regs)
446 {
447 }
448
ftrace_trace_userstack(struct ring_buffer * buffer,unsigned long flags,int pc)449 static inline void ftrace_trace_userstack(struct ring_buffer *buffer,
450 unsigned long flags, int pc)
451 {
452 }
453
__trace_stack(struct trace_array * tr,unsigned long flags,int skip,int pc)454 static inline void __trace_stack(struct trace_array *tr, unsigned long flags,
455 int skip, int pc)
456 {
457 }
458 #endif /* CONFIG_STACKTRACE */
459
460 extern cycle_t ftrace_now(int cpu);
461
462 extern void trace_find_cmdline(int pid, char comm[]);
463
464 #ifdef CONFIG_DYNAMIC_FTRACE
465 extern unsigned long ftrace_update_tot_cnt;
466 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
467 extern int DYN_FTRACE_TEST_NAME(void);
468 #define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2
469 extern int DYN_FTRACE_TEST_NAME2(void);
470 #endif
471
472 extern int ring_buffer_expanded;
473 extern bool tracing_selftest_disabled;
474 DECLARE_PER_CPU(int, ftrace_cpu_disabled);
475
476 #ifdef CONFIG_FTRACE_STARTUP_TEST
477 extern int trace_selftest_startup_function(struct tracer *trace,
478 struct trace_array *tr);
479 extern int trace_selftest_startup_function_graph(struct tracer *trace,
480 struct trace_array *tr);
481 extern int trace_selftest_startup_irqsoff(struct tracer *trace,
482 struct trace_array *tr);
483 extern int trace_selftest_startup_preemptoff(struct tracer *trace,
484 struct trace_array *tr);
485 extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace,
486 struct trace_array *tr);
487 extern int trace_selftest_startup_wakeup(struct tracer *trace,
488 struct trace_array *tr);
489 extern int trace_selftest_startup_nop(struct tracer *trace,
490 struct trace_array *tr);
491 extern int trace_selftest_startup_sched_switch(struct tracer *trace,
492 struct trace_array *tr);
493 extern int trace_selftest_startup_branch(struct tracer *trace,
494 struct trace_array *tr);
495 #endif /* CONFIG_FTRACE_STARTUP_TEST */
496
497 extern void *head_page(struct trace_array_cpu *data);
498 extern unsigned long long ns2usecs(cycle_t nsec);
499 extern int
500 trace_vbprintk(unsigned long ip, const char *fmt, va_list args);
501 extern int
502 trace_vprintk(unsigned long ip, const char *fmt, va_list args);
503 extern int
504 trace_array_vprintk(struct trace_array *tr,
505 unsigned long ip, const char *fmt, va_list args);
506 int trace_array_printk(struct trace_array *tr,
507 unsigned long ip, const char *fmt, ...);
508 void trace_printk_seq(struct trace_seq *s);
509 enum print_line_t print_trace_line(struct trace_iterator *iter);
510
511 extern unsigned long trace_flags;
512
513 extern int trace_clock_id;
514
515 /* Standard output formatting function used for function return traces */
516 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
517
518 /* Flag options */
519 #define TRACE_GRAPH_PRINT_OVERRUN 0x1
520 #define TRACE_GRAPH_PRINT_CPU 0x2
521 #define TRACE_GRAPH_PRINT_OVERHEAD 0x4
522 #define TRACE_GRAPH_PRINT_PROC 0x8
523 #define TRACE_GRAPH_PRINT_DURATION 0x10
524 #define TRACE_GRAPH_PRINT_ABS_TIME 0x20
525
526 extern enum print_line_t
527 print_graph_function_flags(struct trace_iterator *iter, u32 flags);
528 extern void print_graph_headers_flags(struct seq_file *s, u32 flags);
529 extern enum print_line_t
530 trace_print_graph_duration(unsigned long long duration, struct trace_seq *s);
531 extern void graph_trace_open(struct trace_iterator *iter);
532 extern void graph_trace_close(struct trace_iterator *iter);
533 extern int __trace_graph_entry(struct trace_array *tr,
534 struct ftrace_graph_ent *trace,
535 unsigned long flags, int pc);
536 extern void __trace_graph_return(struct trace_array *tr,
537 struct ftrace_graph_ret *trace,
538 unsigned long flags, int pc);
539
540
541 #ifdef CONFIG_DYNAMIC_FTRACE
542 /* TODO: make this variable */
543 #define FTRACE_GRAPH_MAX_FUNCS 32
544 extern int ftrace_graph_filter_enabled;
545 extern int ftrace_graph_count;
546 extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS];
547
ftrace_graph_addr(unsigned long addr)548 static inline int ftrace_graph_addr(unsigned long addr)
549 {
550 int i;
551
552 if (!ftrace_graph_filter_enabled)
553 return 1;
554
555 for (i = 0; i < ftrace_graph_count; i++) {
556 if (addr == ftrace_graph_funcs[i]) {
557 /*
558 * If no irqs are to be traced, but a set_graph_function
559 * is set, and called by an interrupt handler, we still
560 * want to trace it.
561 */
562 if (in_irq())
563 trace_recursion_set(TRACE_IRQ_BIT);
564 else
565 trace_recursion_clear(TRACE_IRQ_BIT);
566 return 1;
567 }
568 }
569
570 return 0;
571 }
572 #else
ftrace_graph_addr(unsigned long addr)573 static inline int ftrace_graph_addr(unsigned long addr)
574 {
575 return 1;
576 }
577 #endif /* CONFIG_DYNAMIC_FTRACE */
578 #else /* CONFIG_FUNCTION_GRAPH_TRACER */
579 static inline enum print_line_t
print_graph_function_flags(struct trace_iterator * iter,u32 flags)580 print_graph_function_flags(struct trace_iterator *iter, u32 flags)
581 {
582 return TRACE_TYPE_UNHANDLED;
583 }
584 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
585
586 extern struct list_head ftrace_pids;
587
588 #ifdef CONFIG_FUNCTION_TRACER
ftrace_trace_task(struct task_struct * task)589 static inline int ftrace_trace_task(struct task_struct *task)
590 {
591 if (list_empty(&ftrace_pids))
592 return 1;
593
594 return test_tsk_trace_trace(task);
595 }
596 extern int ftrace_is_dead(void);
597 #else
ftrace_trace_task(struct task_struct * task)598 static inline int ftrace_trace_task(struct task_struct *task)
599 {
600 return 1;
601 }
ftrace_is_dead(void)602 static inline int ftrace_is_dead(void) { return 0; }
603 #endif
604
605 int ftrace_event_is_function(struct ftrace_event_call *call);
606
607 /*
608 * struct trace_parser - servers for reading the user input separated by spaces
609 * @cont: set if the input is not complete - no final space char was found
610 * @buffer: holds the parsed user input
611 * @idx: user input length
612 * @size: buffer size
613 */
614 struct trace_parser {
615 bool cont;
616 char *buffer;
617 unsigned idx;
618 unsigned size;
619 };
620
trace_parser_loaded(struct trace_parser * parser)621 static inline bool trace_parser_loaded(struct trace_parser *parser)
622 {
623 return (parser->idx != 0);
624 }
625
trace_parser_cont(struct trace_parser * parser)626 static inline bool trace_parser_cont(struct trace_parser *parser)
627 {
628 return parser->cont;
629 }
630
trace_parser_clear(struct trace_parser * parser)631 static inline void trace_parser_clear(struct trace_parser *parser)
632 {
633 parser->cont = false;
634 parser->idx = 0;
635 }
636
637 extern int trace_parser_get_init(struct trace_parser *parser, int size);
638 extern void trace_parser_put(struct trace_parser *parser);
639 extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
640 size_t cnt, loff_t *ppos);
641
642 /*
643 * trace_iterator_flags is an enumeration that defines bit
644 * positions into trace_flags that controls the output.
645 *
646 * NOTE: These bits must match the trace_options array in
647 * trace.c.
648 */
649 enum trace_iterator_flags {
650 TRACE_ITER_PRINT_PARENT = 0x01,
651 TRACE_ITER_SYM_OFFSET = 0x02,
652 TRACE_ITER_SYM_ADDR = 0x04,
653 TRACE_ITER_VERBOSE = 0x08,
654 TRACE_ITER_RAW = 0x10,
655 TRACE_ITER_HEX = 0x20,
656 TRACE_ITER_BIN = 0x40,
657 TRACE_ITER_BLOCK = 0x80,
658 TRACE_ITER_STACKTRACE = 0x100,
659 TRACE_ITER_PRINTK = 0x200,
660 TRACE_ITER_PREEMPTONLY = 0x400,
661 TRACE_ITER_BRANCH = 0x800,
662 TRACE_ITER_ANNOTATE = 0x1000,
663 TRACE_ITER_USERSTACKTRACE = 0x2000,
664 TRACE_ITER_SYM_USEROBJ = 0x4000,
665 TRACE_ITER_PRINTK_MSGONLY = 0x8000,
666 TRACE_ITER_CONTEXT_INFO = 0x10000, /* Print pid/cpu/time */
667 TRACE_ITER_LATENCY_FMT = 0x20000,
668 TRACE_ITER_SLEEP_TIME = 0x40000,
669 TRACE_ITER_GRAPH_TIME = 0x80000,
670 TRACE_ITER_RECORD_CMD = 0x100000,
671 TRACE_ITER_OVERWRITE = 0x200000,
672 TRACE_ITER_STOP_ON_FREE = 0x400000,
673 TRACE_ITER_IRQ_INFO = 0x800000,
674 };
675
676 /*
677 * TRACE_ITER_SYM_MASK masks the options in trace_flags that
678 * control the output of kernel symbols.
679 */
680 #define TRACE_ITER_SYM_MASK \
681 (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR)
682
683 extern struct tracer nop_trace;
684
685 #ifdef CONFIG_BRANCH_TRACER
686 extern int enable_branch_tracing(struct trace_array *tr);
687 extern void disable_branch_tracing(void);
trace_branch_enable(struct trace_array * tr)688 static inline int trace_branch_enable(struct trace_array *tr)
689 {
690 if (trace_flags & TRACE_ITER_BRANCH)
691 return enable_branch_tracing(tr);
692 return 0;
693 }
trace_branch_disable(void)694 static inline void trace_branch_disable(void)
695 {
696 /* due to races, always disable */
697 disable_branch_tracing();
698 }
699 #else
trace_branch_enable(struct trace_array * tr)700 static inline int trace_branch_enable(struct trace_array *tr)
701 {
702 return 0;
703 }
trace_branch_disable(void)704 static inline void trace_branch_disable(void)
705 {
706 }
707 #endif /* CONFIG_BRANCH_TRACER */
708
709 /* set ring buffers to default size if not already done so */
710 int tracing_update_buffers(void);
711
712 /* trace event type bit fields, not numeric */
713 enum {
714 TRACE_EVENT_TYPE_PRINTF = 1,
715 TRACE_EVENT_TYPE_RAW = 2,
716 };
717
718 struct ftrace_event_field {
719 struct list_head link;
720 char *name;
721 char *type;
722 int filter_type;
723 int offset;
724 int size;
725 int is_signed;
726 };
727
728 struct event_filter {
729 int n_preds; /* Number assigned */
730 int a_preds; /* allocated */
731 struct filter_pred *preds;
732 struct filter_pred *root;
733 char *filter_string;
734 };
735
736 struct event_subsystem {
737 struct list_head list;
738 const char *name;
739 struct dentry *entry;
740 struct event_filter *filter;
741 int nr_events;
742 int ref_count;
743 };
744
745 #define FILTER_PRED_INVALID ((unsigned short)-1)
746 #define FILTER_PRED_IS_RIGHT (1 << 15)
747 #define FILTER_PRED_FOLD (1 << 15)
748
749 /*
750 * The max preds is the size of unsigned short with
751 * two flags at the MSBs. One bit is used for both the IS_RIGHT
752 * and FOLD flags. The other is reserved.
753 *
754 * 2^14 preds is way more than enough.
755 */
756 #define MAX_FILTER_PRED 16384
757
758 struct filter_pred;
759 struct regex;
760
761 typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event);
762
763 typedef int (*regex_match_func)(char *str, struct regex *r, int len);
764
765 enum regex_type {
766 MATCH_FULL = 0,
767 MATCH_FRONT_ONLY,
768 MATCH_MIDDLE_ONLY,
769 MATCH_END_ONLY,
770 };
771
772 struct regex {
773 char pattern[MAX_FILTER_STR_VAL];
774 int len;
775 int field_len;
776 regex_match_func match;
777 };
778
779 struct filter_pred {
780 filter_pred_fn_t fn;
781 u64 val;
782 struct regex regex;
783 unsigned short *ops;
784 struct ftrace_event_field *field;
785 int offset;
786 int not;
787 int op;
788 unsigned short index;
789 unsigned short parent;
790 unsigned short left;
791 unsigned short right;
792 };
793
794 extern struct list_head ftrace_common_fields;
795
796 extern enum regex_type
797 filter_parse_regex(char *buff, int len, char **search, int *not);
798 extern void print_event_filter(struct ftrace_event_call *call,
799 struct trace_seq *s);
800 extern int apply_event_filter(struct ftrace_event_call *call,
801 char *filter_string);
802 extern int apply_subsystem_event_filter(struct event_subsystem *system,
803 char *filter_string);
804 extern void print_subsystem_event_filter(struct event_subsystem *system,
805 struct trace_seq *s);
806 extern int filter_assign_type(const char *type);
807
808 struct list_head *
809 trace_get_fields(struct ftrace_event_call *event_call);
810
811 static inline int
filter_check_discard(struct ftrace_event_call * call,void * rec,struct ring_buffer * buffer,struct ring_buffer_event * event)812 filter_check_discard(struct ftrace_event_call *call, void *rec,
813 struct ring_buffer *buffer,
814 struct ring_buffer_event *event)
815 {
816 if (unlikely(call->flags & TRACE_EVENT_FL_FILTERED) &&
817 !filter_match_preds(call->filter, rec)) {
818 ring_buffer_discard_commit(buffer, event);
819 return 1;
820 }
821
822 return 0;
823 }
824
825 extern void trace_event_enable_cmd_record(bool enable);
826
827 extern struct mutex event_mutex;
828 extern struct list_head ftrace_events;
829
830 extern const char *__start___trace_bprintk_fmt[];
831 extern const char *__stop___trace_bprintk_fmt[];
832
833 int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set);
834 int set_tracer_flag(unsigned int mask, int enabled);
835
836 #undef FTRACE_ENTRY
837 #define FTRACE_ENTRY(call, struct_name, id, tstruct, print, filter) \
838 extern struct ftrace_event_call \
839 __attribute__((__aligned__(4))) event_##call;
840 #undef FTRACE_ENTRY_DUP
841 #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print, filter) \
842 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \
843 filter)
844 #include "trace_entries.h"
845
846 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER)
847 int perf_ftrace_event_register(struct ftrace_event_call *call,
848 enum trace_reg type, void *data);
849 #else
850 #define perf_ftrace_event_register NULL
851 #endif
852
853 #endif /* _LINUX_KERNEL_TRACE_H */
854