1
2 #ifndef _LINUX_KERNEL_TRACE_H
3 #define _LINUX_KERNEL_TRACE_H
4
5 #include <linux/fs.h>
6 #include <linux/atomic.h>
7 #include <linux/sched.h>
8 #include <linux/clocksource.h>
9 #include <linux/ring_buffer.h>
10 #include <linux/mmiotrace.h>
11 #include <linux/tracepoint.h>
12 #include <linux/ftrace.h>
13 #include <linux/hw_breakpoint.h>
14 #include <linux/trace_seq.h>
15 #include <linux/trace_events.h>
16 #include <linux/compiler.h>
17 #include <linux/trace_seq.h>
18
19 #ifdef CONFIG_FTRACE_SYSCALLS
20 #include <asm/unistd.h> /* For NR_SYSCALLS */
21 #include <asm/syscall.h> /* some archs define it here */
22 #endif
23
24 enum trace_type {
25 __TRACE_FIRST_TYPE = 0,
26
27 TRACE_FN,
28 TRACE_CTX,
29 TRACE_WAKE,
30 TRACE_STACK,
31 TRACE_PRINT,
32 TRACE_BPRINT,
33 TRACE_MMIO_RW,
34 TRACE_MMIO_MAP,
35 TRACE_BRANCH,
36 TRACE_GRAPH_RET,
37 TRACE_GRAPH_ENT,
38 TRACE_USER_STACK,
39 TRACE_BLK,
40 TRACE_BPUTS,
41
42 __TRACE_LAST_TYPE,
43 };
44
45
46 #undef __field
47 #define __field(type, item) type item;
48
49 #undef __field_struct
50 #define __field_struct(type, item) __field(type, item)
51
52 #undef __field_desc
53 #define __field_desc(type, container, item)
54
55 #undef __array
56 #define __array(type, item, size) type item[size];
57
58 #undef __array_desc
59 #define __array_desc(type, container, item, size)
60
61 #undef __dynamic_array
62 #define __dynamic_array(type, item) type item[];
63
64 #undef F_STRUCT
65 #define F_STRUCT(args...) args
66
67 #undef FTRACE_ENTRY
68 #define FTRACE_ENTRY(name, struct_name, id, tstruct, print, filter) \
69 struct struct_name { \
70 struct trace_entry ent; \
71 tstruct \
72 }
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 * syscalls are special, and need special handling, this is why
87 * they are not included in trace_entries.h
88 */
89 struct syscall_trace_enter {
90 struct trace_entry ent;
91 int nr;
92 unsigned long args[];
93 };
94
95 struct syscall_trace_exit {
96 struct trace_entry ent;
97 int nr;
98 long ret;
99 };
100
101 struct kprobe_trace_entry_head {
102 struct trace_entry ent;
103 unsigned long ip;
104 };
105
106 struct kretprobe_trace_entry_head {
107 struct trace_entry ent;
108 unsigned long func;
109 unsigned long ret_ip;
110 };
111
112 /*
113 * trace_flag_type is an enumeration that holds different
114 * states when a trace occurs. These are:
115 * IRQS_OFF - interrupts were disabled
116 * IRQS_NOSUPPORT - arch does not support irqs_disabled_flags
117 * NEED_RESCHED - reschedule is requested
118 * HARDIRQ - inside an interrupt handler
119 * SOFTIRQ - inside a softirq handler
120 */
121 enum 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 TRACE_FLAG_PREEMPT_RESCHED = 0x20,
128 };
129
130 #define TRACE_BUF_SIZE 1024
131
132 struct trace_array;
133
134 /*
135 * The CPU trace array - it consists of thousands of trace entries
136 * plus some other descriptor data: (for example which task started
137 * the trace, etc.)
138 */
139 struct trace_array_cpu {
140 atomic_t disabled;
141 void *buffer_page; /* ring buffer spare */
142
143 unsigned long entries;
144 unsigned long saved_latency;
145 unsigned long critical_start;
146 unsigned long critical_end;
147 unsigned long critical_sequence;
148 unsigned long nice;
149 unsigned long policy;
150 unsigned long rt_priority;
151 unsigned long skipped_entries;
152 cycle_t preempt_timestamp;
153 pid_t pid;
154 kuid_t uid;
155 char comm[TASK_COMM_LEN];
156
157 bool ignore_pid;
158 };
159
160 struct tracer;
161 struct trace_option_dentry;
162
163 struct trace_buffer {
164 struct trace_array *tr;
165 struct ring_buffer *buffer;
166 struct trace_array_cpu __percpu *data;
167 cycle_t time_start;
168 int cpu;
169 };
170
171 #define TRACE_FLAGS_MAX_SIZE 32
172
173 struct trace_options {
174 struct tracer *tracer;
175 struct trace_option_dentry *topts;
176 };
177
178 struct trace_pid_list {
179 unsigned int nr_pids;
180 int order;
181 pid_t *pids;
182 };
183
184 /*
185 * The trace array - an array of per-CPU trace arrays. This is the
186 * highest level data structure that individual tracers deal with.
187 * They have on/off state as well:
188 */
189 struct trace_array {
190 struct list_head list;
191 char *name;
192 struct trace_buffer trace_buffer;
193 #ifdef CONFIG_TRACER_MAX_TRACE
194 /*
195 * The max_buffer is used to snapshot the trace when a maximum
196 * latency is reached, or when the user initiates a snapshot.
197 * Some tracers will use this to store a maximum trace while
198 * it continues examining live traces.
199 *
200 * The buffers for the max_buffer are set up the same as the trace_buffer
201 * When a snapshot is taken, the buffer of the max_buffer is swapped
202 * with the buffer of the trace_buffer and the buffers are reset for
203 * the trace_buffer so the tracing can continue.
204 */
205 struct trace_buffer max_buffer;
206 bool allocated_snapshot;
207 unsigned long max_latency;
208 #endif
209 struct trace_pid_list __rcu *filtered_pids;
210 /*
211 * max_lock is used to protect the swapping of buffers
212 * when taking a max snapshot. The buffers themselves are
213 * protected by per_cpu spinlocks. But the action of the swap
214 * needs its own lock.
215 *
216 * This is defined as a arch_spinlock_t in order to help
217 * with performance when lockdep debugging is enabled.
218 *
219 * It is also used in other places outside the update_max_tr
220 * so it needs to be defined outside of the
221 * CONFIG_TRACER_MAX_TRACE.
222 */
223 arch_spinlock_t max_lock;
224 int buffer_disabled;
225 #ifdef CONFIG_FTRACE_SYSCALLS
226 int sys_refcount_enter;
227 int sys_refcount_exit;
228 struct trace_event_file __rcu *enter_syscall_files[NR_syscalls];
229 struct trace_event_file __rcu *exit_syscall_files[NR_syscalls];
230 #endif
231 int stop_count;
232 int clock_id;
233 int nr_topts;
234 struct tracer *current_trace;
235 unsigned int trace_flags;
236 unsigned char trace_flags_index[TRACE_FLAGS_MAX_SIZE];
237 unsigned int flags;
238 raw_spinlock_t start_lock;
239 struct dentry *dir;
240 struct dentry *options;
241 struct dentry *percpu_dir;
242 struct dentry *event_dir;
243 struct trace_options *topts;
244 struct list_head systems;
245 struct list_head events;
246 cpumask_var_t tracing_cpumask; /* only trace on set CPUs */
247 int ref;
248 #ifdef CONFIG_FUNCTION_TRACER
249 struct ftrace_ops *ops;
250 /* function tracing enabled */
251 int function_enabled;
252 #endif
253 };
254
255 enum {
256 TRACE_ARRAY_FL_GLOBAL = (1 << 0)
257 };
258
259 extern struct list_head ftrace_trace_arrays;
260
261 extern struct mutex trace_types_lock;
262
263 extern int trace_array_get(struct trace_array *tr);
264 extern void trace_array_put(struct trace_array *tr);
265
266 /*
267 * The global tracer (top) should be the first trace array added,
268 * but we check the flag anyway.
269 */
top_trace_array(void)270 static inline struct trace_array *top_trace_array(void)
271 {
272 struct trace_array *tr;
273
274 if (list_empty(&ftrace_trace_arrays))
275 return NULL;
276
277 tr = list_entry(ftrace_trace_arrays.prev,
278 typeof(*tr), list);
279 WARN_ON(!(tr->flags & TRACE_ARRAY_FL_GLOBAL));
280 return tr;
281 }
282
283 #define FTRACE_CMP_TYPE(var, type) \
284 __builtin_types_compatible_p(typeof(var), type *)
285
286 #undef IF_ASSIGN
287 #define IF_ASSIGN(var, entry, etype, id) \
288 if (FTRACE_CMP_TYPE(var, etype)) { \
289 var = (typeof(var))(entry); \
290 WARN_ON(id && (entry)->type != id); \
291 break; \
292 }
293
294 /* Will cause compile errors if type is not found. */
295 extern void __ftrace_bad_type(void);
296
297 /*
298 * The trace_assign_type is a verifier that the entry type is
299 * the same as the type being assigned. To add new types simply
300 * add a line with the following format:
301 *
302 * IF_ASSIGN(var, ent, type, id);
303 *
304 * Where "type" is the trace type that includes the trace_entry
305 * as the "ent" item. And "id" is the trace identifier that is
306 * used in the trace_type enum.
307 *
308 * If the type can have more than one id, then use zero.
309 */
310 #define trace_assign_type(var, ent) \
311 do { \
312 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \
313 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \
314 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \
315 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\
316 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \
317 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \
318 IF_ASSIGN(var, ent, struct bputs_entry, TRACE_BPUTS); \
319 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \
320 TRACE_MMIO_RW); \
321 IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \
322 TRACE_MMIO_MAP); \
323 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \
324 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \
325 TRACE_GRAPH_ENT); \
326 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \
327 TRACE_GRAPH_RET); \
328 __ftrace_bad_type(); \
329 } while (0)
330
331 /*
332 * An option specific to a tracer. This is a boolean value.
333 * The bit is the bit index that sets its value on the
334 * flags value in struct tracer_flags.
335 */
336 struct tracer_opt {
337 const char *name; /* Will appear on the trace_options file */
338 u32 bit; /* Mask assigned in val field in tracer_flags */
339 };
340
341 /*
342 * The set of specific options for a tracer. Your tracer
343 * have to set the initial value of the flags val.
344 */
345 struct tracer_flags {
346 u32 val;
347 struct tracer_opt *opts;
348 };
349
350 /* Makes more easy to define a tracer opt */
351 #define TRACER_OPT(s, b) .name = #s, .bit = b
352
353
354 struct trace_option_dentry {
355 struct tracer_opt *opt;
356 struct tracer_flags *flags;
357 struct trace_array *tr;
358 struct dentry *entry;
359 };
360
361 /**
362 * struct tracer - a specific tracer and its callbacks to interact with tracefs
363 * @name: the name chosen to select it on the available_tracers file
364 * @init: called when one switches to this tracer (echo name > current_tracer)
365 * @reset: called when one switches to another tracer
366 * @start: called when tracing is unpaused (echo 1 > tracing_enabled)
367 * @stop: called when tracing is paused (echo 0 > tracing_enabled)
368 * @update_thresh: called when tracing_thresh is updated
369 * @open: called when the trace file is opened
370 * @pipe_open: called when the trace_pipe file is opened
371 * @close: called when the trace file is released
372 * @pipe_close: called when the trace_pipe file is released
373 * @read: override the default read callback on trace_pipe
374 * @splice_read: override the default splice_read callback on trace_pipe
375 * @selftest: selftest to run on boot (see trace_selftest.c)
376 * @print_headers: override the first lines that describe your columns
377 * @print_line: callback that prints a trace
378 * @set_flag: signals one of your private flags changed (trace_options file)
379 * @flags: your private flags
380 */
381 struct tracer {
382 const char *name;
383 int (*init)(struct trace_array *tr);
384 void (*reset)(struct trace_array *tr);
385 void (*start)(struct trace_array *tr);
386 void (*stop)(struct trace_array *tr);
387 int (*update_thresh)(struct trace_array *tr);
388 void (*open)(struct trace_iterator *iter);
389 void (*pipe_open)(struct trace_iterator *iter);
390 void (*close)(struct trace_iterator *iter);
391 void (*pipe_close)(struct trace_iterator *iter);
392 ssize_t (*read)(struct trace_iterator *iter,
393 struct file *filp, char __user *ubuf,
394 size_t cnt, loff_t *ppos);
395 ssize_t (*splice_read)(struct trace_iterator *iter,
396 struct file *filp,
397 loff_t *ppos,
398 struct pipe_inode_info *pipe,
399 size_t len,
400 unsigned int flags);
401 #ifdef CONFIG_FTRACE_STARTUP_TEST
402 int (*selftest)(struct tracer *trace,
403 struct trace_array *tr);
404 #endif
405 void (*print_header)(struct seq_file *m);
406 enum print_line_t (*print_line)(struct trace_iterator *iter);
407 /* If you handled the flag setting, return 0 */
408 int (*set_flag)(struct trace_array *tr,
409 u32 old_flags, u32 bit, int set);
410 /* Return 0 if OK with change, else return non-zero */
411 int (*flag_changed)(struct trace_array *tr,
412 u32 mask, int set);
413 struct tracer *next;
414 struct tracer_flags *flags;
415 int enabled;
416 int ref;
417 bool print_max;
418 bool allow_instances;
419 #ifdef CONFIG_TRACER_MAX_TRACE
420 bool use_max_tr;
421 #endif
422 };
423
424
425 /* Only current can touch trace_recursion */
426
427 /*
428 * For function tracing recursion:
429 * The order of these bits are important.
430 *
431 * When function tracing occurs, the following steps are made:
432 * If arch does not support a ftrace feature:
433 * call internal function (uses INTERNAL bits) which calls...
434 * The function callback, which can use the FTRACE bits to
435 * check for recursion.
436 */
437 enum {
438 TRACE_BUFFER_BIT,
439 TRACE_BUFFER_NMI_BIT,
440 TRACE_BUFFER_IRQ_BIT,
441 TRACE_BUFFER_SIRQ_BIT,
442
443 /* Start of function recursion bits */
444 TRACE_FTRACE_BIT,
445 TRACE_FTRACE_NMI_BIT,
446 TRACE_FTRACE_IRQ_BIT,
447 TRACE_FTRACE_SIRQ_BIT,
448 TRACE_FTRACE_TRANSITION_BIT,
449
450 /* Internal use recursion bits */
451 TRACE_INTERNAL_BIT,
452 TRACE_INTERNAL_NMI_BIT,
453 TRACE_INTERNAL_IRQ_BIT,
454 TRACE_INTERNAL_SIRQ_BIT,
455 TRACE_INTERNAL_TRANSITION_BIT,
456
457 TRACE_CONTROL_BIT,
458
459 TRACE_BRANCH_BIT,
460 /*
461 * Abuse of the trace_recursion.
462 * As we need a way to maintain state if we are tracing the function
463 * graph in irq because we want to trace a particular function that
464 * was called in irq context but we have irq tracing off. Since this
465 * can only be modified by current, we can reuse trace_recursion.
466 */
467 TRACE_IRQ_BIT,
468 };
469
470 #define trace_recursion_set(bit) do { (current)->trace_recursion |= (1<<(bit)); } while (0)
471 #define trace_recursion_clear(bit) do { (current)->trace_recursion &= ~(1<<(bit)); } while (0)
472 #define trace_recursion_test(bit) ((current)->trace_recursion & (1<<(bit)))
473
474 #define TRACE_CONTEXT_BITS 4
475
476 #define TRACE_FTRACE_START TRACE_FTRACE_BIT
477
478 #define TRACE_LIST_START TRACE_INTERNAL_BIT
479
480 #define TRACE_CONTEXT_MASK ((1 << (TRACE_LIST_START + TRACE_CONTEXT_BITS)) - 1)
481
482 enum {
483 TRACE_CTX_NMI,
484 TRACE_CTX_IRQ,
485 TRACE_CTX_SOFTIRQ,
486 TRACE_CTX_NORMAL,
487 TRACE_CTX_TRANSITION,
488 };
489
trace_get_context_bit(void)490 static __always_inline int trace_get_context_bit(void)
491 {
492 int bit;
493
494 if (in_interrupt()) {
495 if (in_nmi())
496 bit = TRACE_CTX_NMI;
497
498 else if (in_irq())
499 bit = TRACE_CTX_IRQ;
500 else
501 bit = TRACE_CTX_SOFTIRQ;
502 } else
503 bit = TRACE_CTX_NORMAL;
504
505 return bit;
506 }
507
trace_test_and_set_recursion(int start)508 static __always_inline int trace_test_and_set_recursion(int start)
509 {
510 unsigned int val = current->trace_recursion;
511 int bit;
512
513 bit = trace_get_context_bit() + start;
514 if (unlikely(val & (1 << bit))) {
515 /*
516 * It could be that preempt_count has not been updated during
517 * a switch between contexts. Allow for a single recursion.
518 */
519 bit = start + TRACE_CTX_TRANSITION;
520 if (trace_recursion_test(bit))
521 return -1;
522 trace_recursion_set(bit);
523 barrier();
524 return bit;
525 }
526
527 val |= 1 << bit;
528 current->trace_recursion = val;
529 barrier();
530
531 return bit;
532 }
533
trace_clear_recursion(int bit)534 static __always_inline void trace_clear_recursion(int bit)
535 {
536 unsigned int val = current->trace_recursion;
537
538 bit = 1 << bit;
539 val &= ~bit;
540
541 barrier();
542 current->trace_recursion = val;
543 }
544
545 static inline struct ring_buffer_iter *
trace_buffer_iter(struct trace_iterator * iter,int cpu)546 trace_buffer_iter(struct trace_iterator *iter, int cpu)
547 {
548 if (iter->buffer_iter && iter->buffer_iter[cpu])
549 return iter->buffer_iter[cpu];
550 return NULL;
551 }
552
553 int tracer_init(struct tracer *t, struct trace_array *tr);
554 int tracing_is_enabled(void);
555 void tracing_reset(struct trace_buffer *buf, int cpu);
556 void tracing_reset_online_cpus(struct trace_buffer *buf);
557 void tracing_reset_current(int cpu);
558 void tracing_reset_all_online_cpus(void);
559 int tracing_open_generic(struct inode *inode, struct file *filp);
560 bool tracing_is_disabled(void);
561 struct dentry *trace_create_file(const char *name,
562 umode_t mode,
563 struct dentry *parent,
564 void *data,
565 const struct file_operations *fops);
566
567 struct dentry *tracing_init_dentry(void);
568
569 struct ring_buffer_event;
570
571 struct ring_buffer_event *
572 trace_buffer_lock_reserve(struct ring_buffer *buffer,
573 int type,
574 unsigned long len,
575 unsigned long flags,
576 int pc);
577
578 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,
579 struct trace_array_cpu *data);
580
581 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter,
582 int *ent_cpu, u64 *ent_ts);
583
584 void __buffer_unlock_commit(struct ring_buffer *buffer,
585 struct ring_buffer_event *event);
586
587 int trace_empty(struct trace_iterator *iter);
588
589 void *trace_find_next_entry_inc(struct trace_iterator *iter);
590
591 void trace_init_global_iter(struct trace_iterator *iter);
592
593 void tracing_iter_reset(struct trace_iterator *iter, int cpu);
594
595 void trace_function(struct trace_array *tr,
596 unsigned long ip,
597 unsigned long parent_ip,
598 unsigned long flags, int pc);
599 void trace_graph_function(struct trace_array *tr,
600 unsigned long ip,
601 unsigned long parent_ip,
602 unsigned long flags, int pc);
603 void trace_latency_header(struct seq_file *m);
604 void trace_default_header(struct seq_file *m);
605 void print_trace_header(struct seq_file *m, struct trace_iterator *iter);
606 int trace_empty(struct trace_iterator *iter);
607
608 void trace_graph_return(struct ftrace_graph_ret *trace);
609 int trace_graph_entry(struct ftrace_graph_ent *trace);
610 void set_graph_array(struct trace_array *tr);
611
612 void tracing_start_cmdline_record(void);
613 void tracing_stop_cmdline_record(void);
614 int register_tracer(struct tracer *type);
615 int is_tracing_stopped(void);
616
617 loff_t tracing_lseek(struct file *file, loff_t offset, int whence);
618
619 extern cpumask_var_t __read_mostly tracing_buffer_mask;
620
621 #define for_each_tracing_cpu(cpu) \
622 for_each_cpu(cpu, tracing_buffer_mask)
623
624 extern unsigned long nsecs_to_usecs(unsigned long nsecs);
625
626 extern unsigned long tracing_thresh;
627
628 #ifdef CONFIG_TRACER_MAX_TRACE
629 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu);
630 void update_max_tr_single(struct trace_array *tr,
631 struct task_struct *tsk, int cpu);
632 #endif /* CONFIG_TRACER_MAX_TRACE */
633
634 #ifdef CONFIG_STACKTRACE
635 void ftrace_trace_userstack(struct trace_array *tr,
636 struct ring_buffer *buffer, unsigned long flags,
637 int pc);
638
639 void __trace_stack(struct trace_array *tr, unsigned long flags, int skip,
640 int pc);
641 #else
ftrace_trace_userstack(struct trace_array * tr,struct ring_buffer * buffer,unsigned long flags,int pc)642 static inline void ftrace_trace_userstack(struct trace_array *tr,
643 struct ring_buffer *buffer,
644 unsigned long flags, int pc)
645 {
646 }
647
__trace_stack(struct trace_array * tr,unsigned long flags,int skip,int pc)648 static inline void __trace_stack(struct trace_array *tr, unsigned long flags,
649 int skip, int pc)
650 {
651 }
652 #endif /* CONFIG_STACKTRACE */
653
654 extern cycle_t ftrace_now(int cpu);
655
656 extern void trace_find_cmdline(int pid, char comm[]);
657 extern int trace_find_tgid(int pid);
658
659 #ifdef CONFIG_DYNAMIC_FTRACE
660 extern unsigned long ftrace_update_tot_cnt;
661 #endif
662 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
663 extern int DYN_FTRACE_TEST_NAME(void);
664 #define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2
665 extern int DYN_FTRACE_TEST_NAME2(void);
666
667 extern bool ring_buffer_expanded;
668 extern bool tracing_selftest_disabled;
669
670 #ifdef CONFIG_FTRACE_STARTUP_TEST
671 extern int trace_selftest_startup_function(struct tracer *trace,
672 struct trace_array *tr);
673 extern int trace_selftest_startup_function_graph(struct tracer *trace,
674 struct trace_array *tr);
675 extern int trace_selftest_startup_irqsoff(struct tracer *trace,
676 struct trace_array *tr);
677 extern int trace_selftest_startup_preemptoff(struct tracer *trace,
678 struct trace_array *tr);
679 extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace,
680 struct trace_array *tr);
681 extern int trace_selftest_startup_wakeup(struct tracer *trace,
682 struct trace_array *tr);
683 extern int trace_selftest_startup_nop(struct tracer *trace,
684 struct trace_array *tr);
685 extern int trace_selftest_startup_sched_switch(struct tracer *trace,
686 struct trace_array *tr);
687 extern int trace_selftest_startup_branch(struct tracer *trace,
688 struct trace_array *tr);
689 /*
690 * Tracer data references selftest functions that only occur
691 * on boot up. These can be __init functions. Thus, when selftests
692 * are enabled, then the tracers need to reference __init functions.
693 */
694 #define __tracer_data __refdata
695 #else
696 /* Tracers are seldom changed. Optimize when selftests are disabled. */
697 #define __tracer_data __read_mostly
698 #endif /* CONFIG_FTRACE_STARTUP_TEST */
699
700 extern void *head_page(struct trace_array_cpu *data);
701 extern unsigned long long ns2usecs(cycle_t nsec);
702 extern int
703 trace_vbprintk(unsigned long ip, const char *fmt, va_list args);
704 extern int
705 trace_vprintk(unsigned long ip, const char *fmt, va_list args);
706 extern int
707 trace_array_vprintk(struct trace_array *tr,
708 unsigned long ip, const char *fmt, va_list args);
709 int trace_array_printk(struct trace_array *tr,
710 unsigned long ip, const char *fmt, ...);
711 int trace_array_printk_buf(struct ring_buffer *buffer,
712 unsigned long ip, const char *fmt, ...);
713 void trace_printk_seq(struct trace_seq *s);
714 enum print_line_t print_trace_line(struct trace_iterator *iter);
715
716 extern char trace_find_mark(unsigned long long duration);
717
718 /* Standard output formatting function used for function return traces */
719 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
720
721 /* Flag options */
722 #define TRACE_GRAPH_PRINT_OVERRUN 0x1
723 #define TRACE_GRAPH_PRINT_CPU 0x2
724 #define TRACE_GRAPH_PRINT_OVERHEAD 0x4
725 #define TRACE_GRAPH_PRINT_PROC 0x8
726 #define TRACE_GRAPH_PRINT_DURATION 0x10
727 #define TRACE_GRAPH_PRINT_ABS_TIME 0x20
728 #define TRACE_GRAPH_PRINT_IRQS 0x40
729 #define TRACE_GRAPH_PRINT_TAIL 0x80
730 #define TRACE_GRAPH_SLEEP_TIME 0x100
731 #define TRACE_GRAPH_GRAPH_TIME 0x200
732 #define TRACE_GRAPH_PRINT_FILL_SHIFT 28
733 #define TRACE_GRAPH_PRINT_FILL_MASK (0x3 << TRACE_GRAPH_PRINT_FILL_SHIFT)
734
735 extern void ftrace_graph_sleep_time_control(bool enable);
736 extern void ftrace_graph_graph_time_control(bool enable);
737
738 extern enum print_line_t
739 print_graph_function_flags(struct trace_iterator *iter, u32 flags);
740 extern void print_graph_headers_flags(struct seq_file *s, u32 flags);
741 extern void
742 trace_print_graph_duration(unsigned long long duration, struct trace_seq *s);
743 extern void graph_trace_open(struct trace_iterator *iter);
744 extern void graph_trace_close(struct trace_iterator *iter);
745 extern int __trace_graph_entry(struct trace_array *tr,
746 struct ftrace_graph_ent *trace,
747 unsigned long flags, int pc);
748 extern void __trace_graph_return(struct trace_array *tr,
749 struct ftrace_graph_ret *trace,
750 unsigned long flags, int pc);
751
752
753 #ifdef CONFIG_DYNAMIC_FTRACE
754 /* TODO: make this variable */
755 #define FTRACE_GRAPH_MAX_FUNCS 32
756 extern int ftrace_graph_count;
757 extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS];
758 extern int ftrace_graph_notrace_count;
759 extern unsigned long ftrace_graph_notrace_funcs[FTRACE_GRAPH_MAX_FUNCS];
760
ftrace_graph_addr(unsigned long addr)761 static inline int ftrace_graph_addr(unsigned long addr)
762 {
763 int i;
764
765 if (!ftrace_graph_count)
766 return 1;
767
768 for (i = 0; i < ftrace_graph_count; i++) {
769 if (addr == ftrace_graph_funcs[i]) {
770 /*
771 * If no irqs are to be traced, but a set_graph_function
772 * is set, and called by an interrupt handler, we still
773 * want to trace it.
774 */
775 if (in_irq())
776 trace_recursion_set(TRACE_IRQ_BIT);
777 else
778 trace_recursion_clear(TRACE_IRQ_BIT);
779 return 1;
780 }
781 }
782
783 return 0;
784 }
785
ftrace_graph_notrace_addr(unsigned long addr)786 static inline int ftrace_graph_notrace_addr(unsigned long addr)
787 {
788 int i;
789
790 if (!ftrace_graph_notrace_count)
791 return 0;
792
793 for (i = 0; i < ftrace_graph_notrace_count; i++) {
794 if (addr == ftrace_graph_notrace_funcs[i])
795 return 1;
796 }
797
798 return 0;
799 }
800 #else
ftrace_graph_addr(unsigned long addr)801 static inline int ftrace_graph_addr(unsigned long addr)
802 {
803 return 1;
804 }
805
ftrace_graph_notrace_addr(unsigned long addr)806 static inline int ftrace_graph_notrace_addr(unsigned long addr)
807 {
808 return 0;
809 }
810 #endif /* CONFIG_DYNAMIC_FTRACE */
811 #else /* CONFIG_FUNCTION_GRAPH_TRACER */
812 static inline enum print_line_t
print_graph_function_flags(struct trace_iterator * iter,u32 flags)813 print_graph_function_flags(struct trace_iterator *iter, u32 flags)
814 {
815 return TRACE_TYPE_UNHANDLED;
816 }
817 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
818
819 extern struct list_head ftrace_pids;
820
821 #ifdef CONFIG_FUNCTION_TRACER
822 extern bool ftrace_filter_param __initdata;
ftrace_trace_task(struct task_struct * task)823 static inline int ftrace_trace_task(struct task_struct *task)
824 {
825 if (list_empty(&ftrace_pids))
826 return 1;
827
828 return test_tsk_trace_trace(task);
829 }
830 extern int ftrace_is_dead(void);
831 int ftrace_create_function_files(struct trace_array *tr,
832 struct dentry *parent);
833 void ftrace_destroy_function_files(struct trace_array *tr);
834 void ftrace_init_global_array_ops(struct trace_array *tr);
835 void ftrace_init_array_ops(struct trace_array *tr, ftrace_func_t func);
836 void ftrace_reset_array_ops(struct trace_array *tr);
837 int using_ftrace_ops_list_func(void);
838 #else
ftrace_trace_task(struct task_struct * task)839 static inline int ftrace_trace_task(struct task_struct *task)
840 {
841 return 1;
842 }
ftrace_is_dead(void)843 static inline int ftrace_is_dead(void) { return 0; }
844 static inline int
ftrace_create_function_files(struct trace_array * tr,struct dentry * parent)845 ftrace_create_function_files(struct trace_array *tr,
846 struct dentry *parent)
847 {
848 return 0;
849 }
ftrace_destroy_function_files(struct trace_array * tr)850 static inline void ftrace_destroy_function_files(struct trace_array *tr) { }
851 static inline __init void
ftrace_init_global_array_ops(struct trace_array * tr)852 ftrace_init_global_array_ops(struct trace_array *tr) { }
ftrace_reset_array_ops(struct trace_array * tr)853 static inline void ftrace_reset_array_ops(struct trace_array *tr) { }
854 /* ftace_func_t type is not defined, use macro instead of static inline */
855 #define ftrace_init_array_ops(tr, func) do { } while (0)
856 #endif /* CONFIG_FUNCTION_TRACER */
857
858 #if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_DYNAMIC_FTRACE)
859 void ftrace_create_filter_files(struct ftrace_ops *ops,
860 struct dentry *parent);
861 void ftrace_destroy_filter_files(struct ftrace_ops *ops);
862 #else
863 /*
864 * The ops parameter passed in is usually undefined.
865 * This must be a macro.
866 */
867 #define ftrace_create_filter_files(ops, parent) do { } while (0)
868 #define ftrace_destroy_filter_files(ops) do { } while (0)
869 #endif /* CONFIG_FUNCTION_TRACER && CONFIG_DYNAMIC_FTRACE */
870
871 bool ftrace_event_is_function(struct trace_event_call *call);
872
873 /*
874 * struct trace_parser - servers for reading the user input separated by spaces
875 * @cont: set if the input is not complete - no final space char was found
876 * @buffer: holds the parsed user input
877 * @idx: user input length
878 * @size: buffer size
879 */
880 struct trace_parser {
881 bool cont;
882 char *buffer;
883 unsigned idx;
884 unsigned size;
885 };
886
trace_parser_loaded(struct trace_parser * parser)887 static inline bool trace_parser_loaded(struct trace_parser *parser)
888 {
889 return (parser->idx != 0);
890 }
891
trace_parser_cont(struct trace_parser * parser)892 static inline bool trace_parser_cont(struct trace_parser *parser)
893 {
894 return parser->cont;
895 }
896
trace_parser_clear(struct trace_parser * parser)897 static inline void trace_parser_clear(struct trace_parser *parser)
898 {
899 parser->cont = false;
900 parser->idx = 0;
901 }
902
903 extern int trace_parser_get_init(struct trace_parser *parser, int size);
904 extern void trace_parser_put(struct trace_parser *parser);
905 extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
906 size_t cnt, loff_t *ppos);
907
908 /*
909 * Only create function graph options if function graph is configured.
910 */
911 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
912 # define FGRAPH_FLAGS \
913 C(DISPLAY_GRAPH, "display-graph"),
914 #else
915 # define FGRAPH_FLAGS
916 #endif
917
918 #ifdef CONFIG_BRANCH_TRACER
919 # define BRANCH_FLAGS \
920 C(BRANCH, "branch"),
921 #else
922 # define BRANCH_FLAGS
923 #endif
924
925 #ifdef CONFIG_FUNCTION_TRACER
926 # define FUNCTION_FLAGS \
927 C(FUNCTION, "function-trace"),
928 # define FUNCTION_DEFAULT_FLAGS TRACE_ITER_FUNCTION
929 #else
930 # define FUNCTION_FLAGS
931 # define FUNCTION_DEFAULT_FLAGS 0UL
932 #endif
933
934 #ifdef CONFIG_STACKTRACE
935 # define STACK_FLAGS \
936 C(STACKTRACE, "stacktrace"),
937 #else
938 # define STACK_FLAGS
939 #endif
940
941 /*
942 * trace_iterator_flags is an enumeration that defines bit
943 * positions into trace_flags that controls the output.
944 *
945 * NOTE: These bits must match the trace_options array in
946 * trace.c (this macro guarantees it).
947 */
948 #define TRACE_FLAGS \
949 C(PRINT_PARENT, "print-parent"), \
950 C(SYM_OFFSET, "sym-offset"), \
951 C(SYM_ADDR, "sym-addr"), \
952 C(VERBOSE, "verbose"), \
953 C(RAW, "raw"), \
954 C(HEX, "hex"), \
955 C(BIN, "bin"), \
956 C(BLOCK, "block"), \
957 C(PRINTK, "trace_printk"), \
958 C(ANNOTATE, "annotate"), \
959 C(USERSTACKTRACE, "userstacktrace"), \
960 C(SYM_USEROBJ, "sym-userobj"), \
961 C(PRINTK_MSGONLY, "printk-msg-only"), \
962 C(CONTEXT_INFO, "context-info"), /* Print pid/cpu/time */ \
963 C(LATENCY_FMT, "latency-format"), \
964 C(RECORD_CMD, "record-cmd"), \
965 C(OVERWRITE, "overwrite"), \
966 C(STOP_ON_FREE, "disable_on_free"), \
967 C(IRQ_INFO, "irq-info"), \
968 C(MARKERS, "markers"), \
969 FUNCTION_FLAGS \
970 FGRAPH_FLAGS \
971 STACK_FLAGS \
972 BRANCH_FLAGS \
973 C(TGID, "print-tgid"),
974
975 /*
976 * By defining C, we can make TRACE_FLAGS a list of bit names
977 * that will define the bits for the flag masks.
978 */
979 #undef C
980 #define C(a, b) TRACE_ITER_##a##_BIT
981
982 enum trace_iterator_bits {
983 TRACE_FLAGS
984 /* Make sure we don't go more than we have bits for */
985 TRACE_ITER_LAST_BIT
986 };
987
988 /*
989 * By redefining C, we can make TRACE_FLAGS a list of masks that
990 * use the bits as defined above.
991 */
992 #undef C
993 #define C(a, b) TRACE_ITER_##a = (1 << TRACE_ITER_##a##_BIT)
994
995 enum trace_iterator_flags { TRACE_FLAGS };
996
997 /*
998 * TRACE_ITER_SYM_MASK masks the options in trace_flags that
999 * control the output of kernel symbols.
1000 */
1001 #define TRACE_ITER_SYM_MASK \
1002 (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR)
1003
1004 extern struct tracer nop_trace;
1005
1006 #ifdef CONFIG_BRANCH_TRACER
1007 extern int enable_branch_tracing(struct trace_array *tr);
1008 extern void disable_branch_tracing(void);
trace_branch_enable(struct trace_array * tr)1009 static inline int trace_branch_enable(struct trace_array *tr)
1010 {
1011 if (tr->trace_flags & TRACE_ITER_BRANCH)
1012 return enable_branch_tracing(tr);
1013 return 0;
1014 }
trace_branch_disable(void)1015 static inline void trace_branch_disable(void)
1016 {
1017 /* due to races, always disable */
1018 disable_branch_tracing();
1019 }
1020 #else
trace_branch_enable(struct trace_array * tr)1021 static inline int trace_branch_enable(struct trace_array *tr)
1022 {
1023 return 0;
1024 }
trace_branch_disable(void)1025 static inline void trace_branch_disable(void)
1026 {
1027 }
1028 #endif /* CONFIG_BRANCH_TRACER */
1029
1030 /* set ring buffers to default size if not already done so */
1031 int tracing_update_buffers(void);
1032
1033 struct ftrace_event_field {
1034 struct list_head link;
1035 const char *name;
1036 const char *type;
1037 int filter_type;
1038 int offset;
1039 int size;
1040 int is_signed;
1041 };
1042
1043 struct event_filter {
1044 int n_preds; /* Number assigned */
1045 int a_preds; /* allocated */
1046 struct filter_pred *preds;
1047 struct filter_pred *root;
1048 char *filter_string;
1049 };
1050
1051 struct event_subsystem {
1052 struct list_head list;
1053 const char *name;
1054 struct event_filter *filter;
1055 int ref_count;
1056 };
1057
1058 struct trace_subsystem_dir {
1059 struct list_head list;
1060 struct event_subsystem *subsystem;
1061 struct trace_array *tr;
1062 struct dentry *entry;
1063 int ref_count;
1064 int nr_events;
1065 };
1066
1067 #define FILTER_PRED_INVALID ((unsigned short)-1)
1068 #define FILTER_PRED_IS_RIGHT (1 << 15)
1069 #define FILTER_PRED_FOLD (1 << 15)
1070
1071 /*
1072 * The max preds is the size of unsigned short with
1073 * two flags at the MSBs. One bit is used for both the IS_RIGHT
1074 * and FOLD flags. The other is reserved.
1075 *
1076 * 2^14 preds is way more than enough.
1077 */
1078 #define MAX_FILTER_PRED 16384
1079
1080 struct filter_pred;
1081 struct regex;
1082
1083 typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event);
1084
1085 typedef int (*regex_match_func)(char *str, struct regex *r, int len);
1086
1087 enum regex_type {
1088 MATCH_FULL = 0,
1089 MATCH_FRONT_ONLY,
1090 MATCH_MIDDLE_ONLY,
1091 MATCH_END_ONLY,
1092 };
1093
1094 struct regex {
1095 char pattern[MAX_FILTER_STR_VAL];
1096 int len;
1097 int field_len;
1098 regex_match_func match;
1099 };
1100
1101 struct filter_pred {
1102 filter_pred_fn_t fn;
1103 u64 val;
1104 struct regex regex;
1105 unsigned short *ops;
1106 struct ftrace_event_field *field;
1107 int offset;
1108 int not;
1109 int op;
1110 unsigned short index;
1111 unsigned short parent;
1112 unsigned short left;
1113 unsigned short right;
1114 };
1115
1116 extern enum regex_type
1117 filter_parse_regex(char *buff, int len, char **search, int *not);
1118 extern void print_event_filter(struct trace_event_file *file,
1119 struct trace_seq *s);
1120 extern int apply_event_filter(struct trace_event_file *file,
1121 char *filter_string);
1122 extern int apply_subsystem_event_filter(struct trace_subsystem_dir *dir,
1123 char *filter_string);
1124 extern void print_subsystem_event_filter(struct event_subsystem *system,
1125 struct trace_seq *s);
1126 extern int filter_assign_type(const char *type);
1127 extern int create_event_filter(struct trace_event_call *call,
1128 char *filter_str, bool set_str,
1129 struct event_filter **filterp);
1130 extern void free_event_filter(struct event_filter *filter);
1131
1132 struct ftrace_event_field *
1133 trace_find_event_field(struct trace_event_call *call, char *name);
1134
1135 extern void trace_event_enable_cmd_record(bool enable);
1136 extern int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr);
1137 extern int event_trace_del_tracer(struct trace_array *tr);
1138
1139 extern struct trace_event_file *find_event_file(struct trace_array *tr,
1140 const char *system,
1141 const char *event);
1142
event_file_data(struct file * filp)1143 static inline void *event_file_data(struct file *filp)
1144 {
1145 return ACCESS_ONCE(file_inode(filp)->i_private);
1146 }
1147
1148 extern struct mutex event_mutex;
1149 extern struct list_head ftrace_events;
1150
1151 extern const struct file_operations event_trigger_fops;
1152
1153 extern int register_trigger_cmds(void);
1154 extern void clear_event_triggers(struct trace_array *tr);
1155
1156 struct event_trigger_data {
1157 unsigned long count;
1158 int ref;
1159 struct event_trigger_ops *ops;
1160 struct event_command *cmd_ops;
1161 struct event_filter __rcu *filter;
1162 char *filter_str;
1163 void *private_data;
1164 struct list_head list;
1165 };
1166
1167 /**
1168 * struct event_trigger_ops - callbacks for trace event triggers
1169 *
1170 * The methods in this structure provide per-event trigger hooks for
1171 * various trigger operations.
1172 *
1173 * All the methods below, except for @init() and @free(), must be
1174 * implemented.
1175 *
1176 * @func: The trigger 'probe' function called when the triggering
1177 * event occurs. The data passed into this callback is the data
1178 * that was supplied to the event_command @reg() function that
1179 * registered the trigger (see struct event_command).
1180 *
1181 * @init: An optional initialization function called for the trigger
1182 * when the trigger is registered (via the event_command reg()
1183 * function). This can be used to perform per-trigger
1184 * initialization such as incrementing a per-trigger reference
1185 * count, for instance. This is usually implemented by the
1186 * generic utility function @event_trigger_init() (see
1187 * trace_event_triggers.c).
1188 *
1189 * @free: An optional de-initialization function called for the
1190 * trigger when the trigger is unregistered (via the
1191 * event_command @reg() function). This can be used to perform
1192 * per-trigger de-initialization such as decrementing a
1193 * per-trigger reference count and freeing corresponding trigger
1194 * data, for instance. This is usually implemented by the
1195 * generic utility function @event_trigger_free() (see
1196 * trace_event_triggers.c).
1197 *
1198 * @print: The callback function invoked to have the trigger print
1199 * itself. This is usually implemented by a wrapper function
1200 * that calls the generic utility function @event_trigger_print()
1201 * (see trace_event_triggers.c).
1202 */
1203 struct event_trigger_ops {
1204 void (*func)(struct event_trigger_data *data);
1205 int (*init)(struct event_trigger_ops *ops,
1206 struct event_trigger_data *data);
1207 void (*free)(struct event_trigger_ops *ops,
1208 struct event_trigger_data *data);
1209 int (*print)(struct seq_file *m,
1210 struct event_trigger_ops *ops,
1211 struct event_trigger_data *data);
1212 };
1213
1214 /**
1215 * struct event_command - callbacks and data members for event commands
1216 *
1217 * Event commands are invoked by users by writing the command name
1218 * into the 'trigger' file associated with a trace event. The
1219 * parameters associated with a specific invocation of an event
1220 * command are used to create an event trigger instance, which is
1221 * added to the list of trigger instances associated with that trace
1222 * event. When the event is hit, the set of triggers associated with
1223 * that event is invoked.
1224 *
1225 * The data members in this structure provide per-event command data
1226 * for various event commands.
1227 *
1228 * All the data members below, except for @post_trigger, must be set
1229 * for each event command.
1230 *
1231 * @name: The unique name that identifies the event command. This is
1232 * the name used when setting triggers via trigger files.
1233 *
1234 * @trigger_type: A unique id that identifies the event command
1235 * 'type'. This value has two purposes, the first to ensure that
1236 * only one trigger of the same type can be set at a given time
1237 * for a particular event e.g. it doesn't make sense to have both
1238 * a traceon and traceoff trigger attached to a single event at
1239 * the same time, so traceon and traceoff have the same type
1240 * though they have different names. The @trigger_type value is
1241 * also used as a bit value for deferring the actual trigger
1242 * action until after the current event is finished. Some
1243 * commands need to do this if they themselves log to the trace
1244 * buffer (see the @post_trigger() member below). @trigger_type
1245 * values are defined by adding new values to the trigger_type
1246 * enum in include/linux/trace_events.h.
1247 *
1248 * @post_trigger: A flag that says whether or not this command needs
1249 * to have its action delayed until after the current event has
1250 * been closed. Some triggers need to avoid being invoked while
1251 * an event is currently in the process of being logged, since
1252 * the trigger may itself log data into the trace buffer. Thus
1253 * we make sure the current event is committed before invoking
1254 * those triggers. To do that, the trigger invocation is split
1255 * in two - the first part checks the filter using the current
1256 * trace record; if a command has the @post_trigger flag set, it
1257 * sets a bit for itself in the return value, otherwise it
1258 * directly invokes the trigger. Once all commands have been
1259 * either invoked or set their return flag, the current record is
1260 * either committed or discarded. At that point, if any commands
1261 * have deferred their triggers, those commands are finally
1262 * invoked following the close of the current event. In other
1263 * words, if the event_trigger_ops @func() probe implementation
1264 * itself logs to the trace buffer, this flag should be set,
1265 * otherwise it can be left unspecified.
1266 *
1267 * All the methods below, except for @set_filter(), must be
1268 * implemented.
1269 *
1270 * @func: The callback function responsible for parsing and
1271 * registering the trigger written to the 'trigger' file by the
1272 * user. It allocates the trigger instance and registers it with
1273 * the appropriate trace event. It makes use of the other
1274 * event_command callback functions to orchestrate this, and is
1275 * usually implemented by the generic utility function
1276 * @event_trigger_callback() (see trace_event_triggers.c).
1277 *
1278 * @reg: Adds the trigger to the list of triggers associated with the
1279 * event, and enables the event trigger itself, after
1280 * initializing it (via the event_trigger_ops @init() function).
1281 * This is also where commands can use the @trigger_type value to
1282 * make the decision as to whether or not multiple instances of
1283 * the trigger should be allowed. This is usually implemented by
1284 * the generic utility function @register_trigger() (see
1285 * trace_event_triggers.c).
1286 *
1287 * @unreg: Removes the trigger from the list of triggers associated
1288 * with the event, and disables the event trigger itself, after
1289 * initializing it (via the event_trigger_ops @free() function).
1290 * This is usually implemented by the generic utility function
1291 * @unregister_trigger() (see trace_event_triggers.c).
1292 *
1293 * @set_filter: An optional function called to parse and set a filter
1294 * for the trigger. If no @set_filter() method is set for the
1295 * event command, filters set by the user for the command will be
1296 * ignored. This is usually implemented by the generic utility
1297 * function @set_trigger_filter() (see trace_event_triggers.c).
1298 *
1299 * @get_trigger_ops: The callback function invoked to retrieve the
1300 * event_trigger_ops implementation associated with the command.
1301 */
1302 struct event_command {
1303 struct list_head list;
1304 char *name;
1305 enum event_trigger_type trigger_type;
1306 bool post_trigger;
1307 int (*func)(struct event_command *cmd_ops,
1308 struct trace_event_file *file,
1309 char *glob, char *cmd, char *params);
1310 int (*reg)(char *glob,
1311 struct event_trigger_ops *ops,
1312 struct event_trigger_data *data,
1313 struct trace_event_file *file);
1314 void (*unreg)(char *glob,
1315 struct event_trigger_ops *ops,
1316 struct event_trigger_data *data,
1317 struct trace_event_file *file);
1318 int (*set_filter)(char *filter_str,
1319 struct event_trigger_data *data,
1320 struct trace_event_file *file);
1321 struct event_trigger_ops *(*get_trigger_ops)(char *cmd, char *param);
1322 };
1323
1324 extern int trace_event_enable_disable(struct trace_event_file *file,
1325 int enable, int soft_disable);
1326 extern int tracing_alloc_snapshot(void);
1327
1328 extern const char *__start___trace_bprintk_fmt[];
1329 extern const char *__stop___trace_bprintk_fmt[];
1330
1331 extern const char *__start___tracepoint_str[];
1332 extern const char *__stop___tracepoint_str[];
1333
1334 void trace_printk_control(bool enabled);
1335 void trace_printk_init_buffers(void);
1336 void trace_printk_start_comm(void);
1337 int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set);
1338 int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled);
1339
1340 /*
1341 * Normal trace_printk() and friends allocates special buffers
1342 * to do the manipulation, as well as saves the print formats
1343 * into sections to display. But the trace infrastructure wants
1344 * to use these without the added overhead at the price of being
1345 * a bit slower (used mainly for warnings, where we don't care
1346 * about performance). The internal_trace_puts() is for such
1347 * a purpose.
1348 */
1349 #define internal_trace_puts(str) __trace_puts(_THIS_IP_, str, strlen(str))
1350
1351 #undef FTRACE_ENTRY
1352 #define FTRACE_ENTRY(call, struct_name, id, tstruct, print, filter) \
1353 extern struct trace_event_call \
1354 __aligned(4) event_##call;
1355 #undef FTRACE_ENTRY_DUP
1356 #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print, filter) \
1357 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \
1358 filter)
1359 #include "trace_entries.h"
1360
1361 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER)
1362 int perf_ftrace_event_register(struct trace_event_call *call,
1363 enum trace_reg type, void *data);
1364 #else
1365 #define perf_ftrace_event_register NULL
1366 #endif
1367
1368 #ifdef CONFIG_FTRACE_SYSCALLS
1369 void init_ftrace_syscalls(void);
1370 #else
init_ftrace_syscalls(void)1371 static inline void init_ftrace_syscalls(void) { }
1372 #endif
1373
1374 #ifdef CONFIG_EVENT_TRACING
1375 void trace_event_init(void);
1376 void trace_event_enum_update(struct trace_enum_map **map, int len);
1377 #else
trace_event_init(void)1378 static inline void __init trace_event_init(void) { }
trace_event_enum_update(struct trace_enum_map ** map,int len)1379 static inline void trace_event_enum_update(struct trace_enum_map **map, int len) { }
1380 #endif
1381
1382 extern struct trace_iterator *tracepoint_print_iter;
1383
1384 /*
1385 * Reset the state of the trace_iterator so that it can read consumed data.
1386 * Normally, the trace_iterator is used for reading the data when it is not
1387 * consumed, and must retain state.
1388 */
trace_iterator_reset(struct trace_iterator * iter)1389 static __always_inline void trace_iterator_reset(struct trace_iterator *iter)
1390 {
1391 const size_t offset = offsetof(struct trace_iterator, seq);
1392
1393 /*
1394 * Keep gcc from complaining about overwriting more than just one
1395 * member in the structure.
1396 */
1397 memset((char *)iter + offset, 0, sizeof(struct trace_iterator) - offset);
1398
1399 iter->pos = -1;
1400 }
1401
1402 #endif /* _LINUX_KERNEL_TRACE_H */
1403