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/ftrace_event.h>
16 #include <linux/compiler.h>
17
18 #ifdef CONFIG_FTRACE_SYSCALLS
19 #include <asm/unistd.h> /* For NR_SYSCALLS */
20 #include <asm/syscall.h> /* some archs define it here */
21 #endif
22
23 enum trace_type {
24 __TRACE_FIRST_TYPE = 0,
25
26 TRACE_FN,
27 TRACE_CTX,
28 TRACE_WAKE,
29 TRACE_STACK,
30 TRACE_PRINT,
31 TRACE_BPRINT,
32 TRACE_MMIO_RW,
33 TRACE_MMIO_MAP,
34 TRACE_BRANCH,
35 TRACE_GRAPH_RET,
36 TRACE_GRAPH_ENT,
37 TRACE_USER_STACK,
38 TRACE_BLK,
39 TRACE_BPUTS,
40
41 __TRACE_LAST_TYPE,
42 };
43
44
45 #undef __field
46 #define __field(type, item) type item;
47
48 #undef __field_struct
49 #define __field_struct(type, item) __field(type, item)
50
51 #undef __field_desc
52 #define __field_desc(type, container, item)
53
54 #undef __array
55 #define __array(type, item, size) type item[size];
56
57 #undef __array_desc
58 #define __array_desc(type, container, item, size)
59
60 #undef __dynamic_array
61 #define __dynamic_array(type, item) type item[];
62
63 #undef F_STRUCT
64 #define F_STRUCT(args...) args
65
66 #undef FTRACE_ENTRY
67 #define FTRACE_ENTRY(name, struct_name, id, tstruct, print, filter) \
68 struct struct_name { \
69 struct trace_entry ent; \
70 tstruct \
71 }
72
73 #undef TP_ARGS
74 #define TP_ARGS(args...) args
75
76 #undef FTRACE_ENTRY_DUP
77 #define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk, filter)
78
79 #undef FTRACE_ENTRY_REG
80 #define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, \
81 filter, regfn) \
82 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \
83 filter)
84
85 #include "trace_entries.h"
86
87 /*
88 * syscalls are special, and need special handling, this is why
89 * they are not included in trace_entries.h
90 */
91 struct syscall_trace_enter {
92 struct trace_entry ent;
93 int nr;
94 unsigned long args[];
95 };
96
97 struct syscall_trace_exit {
98 struct trace_entry ent;
99 int nr;
100 long ret;
101 };
102
103 struct kprobe_trace_entry_head {
104 struct trace_entry ent;
105 unsigned long ip;
106 };
107
108 struct kretprobe_trace_entry_head {
109 struct trace_entry ent;
110 unsigned long func;
111 unsigned long ret_ip;
112 };
113
114 /*
115 * trace_flag_type is an enumeration that holds different
116 * states when a trace occurs. These are:
117 * IRQS_OFF - interrupts were disabled
118 * IRQS_NOSUPPORT - arch does not support irqs_disabled_flags
119 * NEED_RESCHED - reschedule is requested
120 * HARDIRQ - inside an interrupt handler
121 * SOFTIRQ - inside a softirq handler
122 */
123 enum trace_flag_type {
124 TRACE_FLAG_IRQS_OFF = 0x01,
125 TRACE_FLAG_IRQS_NOSUPPORT = 0x02,
126 TRACE_FLAG_NEED_RESCHED = 0x04,
127 TRACE_FLAG_HARDIRQ = 0x08,
128 TRACE_FLAG_SOFTIRQ = 0x10,
129 TRACE_FLAG_PREEMPT_RESCHED = 0x20,
130 };
131
132 #define TRACE_BUF_SIZE 1024
133
134 struct trace_array;
135
136 /*
137 * The CPU trace array - it consists of thousands of trace entries
138 * plus some other descriptor data: (for example which task started
139 * the trace, etc.)
140 */
141 struct trace_array_cpu {
142 atomic_t disabled;
143 void *buffer_page; /* ring buffer spare */
144
145 unsigned long entries;
146 unsigned long saved_latency;
147 unsigned long critical_start;
148 unsigned long critical_end;
149 unsigned long critical_sequence;
150 unsigned long nice;
151 unsigned long policy;
152 unsigned long rt_priority;
153 unsigned long skipped_entries;
154 cycle_t preempt_timestamp;
155 pid_t pid;
156 kuid_t uid;
157 char comm[TASK_COMM_LEN];
158 };
159
160 struct tracer;
161
162 struct trace_buffer {
163 struct trace_array *tr;
164 struct ring_buffer *buffer;
165 struct trace_array_cpu __percpu *data;
166 cycle_t time_start;
167 int cpu;
168 };
169
170 /*
171 * The trace array - an array of per-CPU trace arrays. This is the
172 * highest level data structure that individual tracers deal with.
173 * They have on/off state as well:
174 */
175 struct trace_array {
176 struct list_head list;
177 char *name;
178 struct trace_buffer trace_buffer;
179 #ifdef CONFIG_TRACER_MAX_TRACE
180 /*
181 * The max_buffer is used to snapshot the trace when a maximum
182 * latency is reached, or when the user initiates a snapshot.
183 * Some tracers will use this to store a maximum trace while
184 * it continues examining live traces.
185 *
186 * The buffers for the max_buffer are set up the same as the trace_buffer
187 * When a snapshot is taken, the buffer of the max_buffer is swapped
188 * with the buffer of the trace_buffer and the buffers are reset for
189 * the trace_buffer so the tracing can continue.
190 */
191 struct trace_buffer max_buffer;
192 bool allocated_snapshot;
193 unsigned long max_latency;
194 #endif
195 /*
196 * max_lock is used to protect the swapping of buffers
197 * when taking a max snapshot. The buffers themselves are
198 * protected by per_cpu spinlocks. But the action of the swap
199 * needs its own lock.
200 *
201 * This is defined as a arch_spinlock_t in order to help
202 * with performance when lockdep debugging is enabled.
203 *
204 * It is also used in other places outside the update_max_tr
205 * so it needs to be defined outside of the
206 * CONFIG_TRACER_MAX_TRACE.
207 */
208 arch_spinlock_t max_lock;
209 int buffer_disabled;
210 #ifdef CONFIG_FTRACE_SYSCALLS
211 int sys_refcount_enter;
212 int sys_refcount_exit;
213 struct ftrace_event_file __rcu *enter_syscall_files[NR_syscalls];
214 struct ftrace_event_file __rcu *exit_syscall_files[NR_syscalls];
215 #endif
216 int stop_count;
217 int clock_id;
218 struct tracer *current_trace;
219 unsigned int flags;
220 raw_spinlock_t start_lock;
221 struct dentry *dir;
222 struct dentry *options;
223 struct dentry *percpu_dir;
224 struct dentry *event_dir;
225 struct list_head systems;
226 struct list_head events;
227 cpumask_var_t tracing_cpumask; /* only trace on set CPUs */
228 int ref;
229 #ifdef CONFIG_FUNCTION_TRACER
230 struct ftrace_ops *ops;
231 /* function tracing enabled */
232 int function_enabled;
233 #endif
234 };
235
236 enum {
237 TRACE_ARRAY_FL_GLOBAL = (1 << 0)
238 };
239
240 extern struct list_head ftrace_trace_arrays;
241
242 extern struct mutex trace_types_lock;
243
244 extern int trace_array_get(struct trace_array *tr);
245 extern void trace_array_put(struct trace_array *tr);
246
247 /*
248 * The global tracer (top) should be the first trace array added,
249 * but we check the flag anyway.
250 */
top_trace_array(void)251 static inline struct trace_array *top_trace_array(void)
252 {
253 struct trace_array *tr;
254
255 if (list_empty(&ftrace_trace_arrays))
256 return NULL;
257
258 tr = list_entry(ftrace_trace_arrays.prev,
259 typeof(*tr), list);
260 WARN_ON(!(tr->flags & TRACE_ARRAY_FL_GLOBAL));
261 return tr;
262 }
263
264 #define FTRACE_CMP_TYPE(var, type) \
265 __builtin_types_compatible_p(typeof(var), type *)
266
267 #undef IF_ASSIGN
268 #define IF_ASSIGN(var, entry, etype, id) \
269 if (FTRACE_CMP_TYPE(var, etype)) { \
270 var = (typeof(var))(entry); \
271 WARN_ON(id && (entry)->type != id); \
272 break; \
273 }
274
275 /* Will cause compile errors if type is not found. */
276 extern void __ftrace_bad_type(void);
277
278 /*
279 * The trace_assign_type is a verifier that the entry type is
280 * the same as the type being assigned. To add new types simply
281 * add a line with the following format:
282 *
283 * IF_ASSIGN(var, ent, type, id);
284 *
285 * Where "type" is the trace type that includes the trace_entry
286 * as the "ent" item. And "id" is the trace identifier that is
287 * used in the trace_type enum.
288 *
289 * If the type can have more than one id, then use zero.
290 */
291 #define trace_assign_type(var, ent) \
292 do { \
293 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \
294 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \
295 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \
296 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\
297 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \
298 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \
299 IF_ASSIGN(var, ent, struct bputs_entry, TRACE_BPUTS); \
300 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \
301 TRACE_MMIO_RW); \
302 IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \
303 TRACE_MMIO_MAP); \
304 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \
305 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \
306 TRACE_GRAPH_ENT); \
307 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \
308 TRACE_GRAPH_RET); \
309 __ftrace_bad_type(); \
310 } while (0)
311
312 /*
313 * An option specific to a tracer. This is a boolean value.
314 * The bit is the bit index that sets its value on the
315 * flags value in struct tracer_flags.
316 */
317 struct tracer_opt {
318 const char *name; /* Will appear on the trace_options file */
319 u32 bit; /* Mask assigned in val field in tracer_flags */
320 };
321
322 /*
323 * The set of specific options for a tracer. Your tracer
324 * have to set the initial value of the flags val.
325 */
326 struct tracer_flags {
327 u32 val;
328 struct tracer_opt *opts;
329 };
330
331 /* Makes more easy to define a tracer opt */
332 #define TRACER_OPT(s, b) .name = #s, .bit = b
333
334
335 /**
336 * struct tracer - a specific tracer and its callbacks to interact with tracefs
337 * @name: the name chosen to select it on the available_tracers file
338 * @init: called when one switches to this tracer (echo name > current_tracer)
339 * @reset: called when one switches to another tracer
340 * @start: called when tracing is unpaused (echo 1 > tracing_enabled)
341 * @stop: called when tracing is paused (echo 0 > tracing_enabled)
342 * @update_thresh: called when tracing_thresh is updated
343 * @open: called when the trace file is opened
344 * @pipe_open: called when the trace_pipe file is opened
345 * @close: called when the trace file is released
346 * @pipe_close: called when the trace_pipe file is released
347 * @read: override the default read callback on trace_pipe
348 * @splice_read: override the default splice_read callback on trace_pipe
349 * @selftest: selftest to run on boot (see trace_selftest.c)
350 * @print_headers: override the first lines that describe your columns
351 * @print_line: callback that prints a trace
352 * @set_flag: signals one of your private flags changed (trace_options file)
353 * @flags: your private flags
354 */
355 struct tracer {
356 const char *name;
357 int (*init)(struct trace_array *tr);
358 void (*reset)(struct trace_array *tr);
359 void (*start)(struct trace_array *tr);
360 void (*stop)(struct trace_array *tr);
361 int (*update_thresh)(struct trace_array *tr);
362 void (*open)(struct trace_iterator *iter);
363 void (*pipe_open)(struct trace_iterator *iter);
364 void (*close)(struct trace_iterator *iter);
365 void (*pipe_close)(struct trace_iterator *iter);
366 ssize_t (*read)(struct trace_iterator *iter,
367 struct file *filp, char __user *ubuf,
368 size_t cnt, loff_t *ppos);
369 ssize_t (*splice_read)(struct trace_iterator *iter,
370 struct file *filp,
371 loff_t *ppos,
372 struct pipe_inode_info *pipe,
373 size_t len,
374 unsigned int flags);
375 #ifdef CONFIG_FTRACE_STARTUP_TEST
376 int (*selftest)(struct tracer *trace,
377 struct trace_array *tr);
378 #endif
379 void (*print_header)(struct seq_file *m);
380 enum print_line_t (*print_line)(struct trace_iterator *iter);
381 /* If you handled the flag setting, return 0 */
382 int (*set_flag)(struct trace_array *tr,
383 u32 old_flags, u32 bit, int set);
384 /* Return 0 if OK with change, else return non-zero */
385 int (*flag_changed)(struct trace_array *tr,
386 u32 mask, int set);
387 struct tracer *next;
388 struct tracer_flags *flags;
389 int enabled;
390 bool print_max;
391 bool allow_instances;
392 #ifdef CONFIG_TRACER_MAX_TRACE
393 bool use_max_tr;
394 #endif
395 };
396
397
398 /* Only current can touch trace_recursion */
399
400 /*
401 * For function tracing recursion:
402 * The order of these bits are important.
403 *
404 * When function tracing occurs, the following steps are made:
405 * If arch does not support a ftrace feature:
406 * call internal function (uses INTERNAL bits) which calls...
407 * If callback is registered to the "global" list, the list
408 * function is called and recursion checks the GLOBAL bits.
409 * then this function calls...
410 * The function callback, which can use the FTRACE bits to
411 * check for recursion.
412 *
413 * Now if the arch does not suppport a feature, and it calls
414 * the global list function which calls the ftrace callback
415 * all three of these steps will do a recursion protection.
416 * There's no reason to do one if the previous caller already
417 * did. The recursion that we are protecting against will
418 * go through the same steps again.
419 *
420 * To prevent the multiple recursion checks, if a recursion
421 * bit is set that is higher than the MAX bit of the current
422 * check, then we know that the check was made by the previous
423 * caller, and we can skip the current check.
424 */
425 enum {
426 TRACE_BUFFER_BIT,
427 TRACE_BUFFER_NMI_BIT,
428 TRACE_BUFFER_IRQ_BIT,
429 TRACE_BUFFER_SIRQ_BIT,
430
431 /* Start of function recursion bits */
432 TRACE_FTRACE_BIT,
433 TRACE_FTRACE_NMI_BIT,
434 TRACE_FTRACE_IRQ_BIT,
435 TRACE_FTRACE_SIRQ_BIT,
436
437 /* INTERNAL_BITs must be greater than FTRACE_BITs */
438 TRACE_INTERNAL_BIT,
439 TRACE_INTERNAL_NMI_BIT,
440 TRACE_INTERNAL_IRQ_BIT,
441 TRACE_INTERNAL_SIRQ_BIT,
442
443 TRACE_CONTROL_BIT,
444
445 TRACE_BRANCH_BIT,
446 /*
447 * Abuse of the trace_recursion.
448 * As we need a way to maintain state if we are tracing the function
449 * graph in irq because we want to trace a particular function that
450 * was called in irq context but we have irq tracing off. Since this
451 * can only be modified by current, we can reuse trace_recursion.
452 */
453 TRACE_IRQ_BIT,
454 };
455
456 #define trace_recursion_set(bit) do { (current)->trace_recursion |= (1<<(bit)); } while (0)
457 #define trace_recursion_clear(bit) do { (current)->trace_recursion &= ~(1<<(bit)); } while (0)
458 #define trace_recursion_test(bit) ((current)->trace_recursion & (1<<(bit)))
459
460 #define TRACE_CONTEXT_BITS 4
461
462 #define TRACE_FTRACE_START TRACE_FTRACE_BIT
463 #define TRACE_FTRACE_MAX ((1 << (TRACE_FTRACE_START + TRACE_CONTEXT_BITS)) - 1)
464
465 #define TRACE_LIST_START TRACE_INTERNAL_BIT
466 #define TRACE_LIST_MAX ((1 << (TRACE_LIST_START + TRACE_CONTEXT_BITS)) - 1)
467
468 #define TRACE_CONTEXT_MASK TRACE_LIST_MAX
469
trace_get_context_bit(void)470 static __always_inline int trace_get_context_bit(void)
471 {
472 int bit;
473
474 if (in_interrupt()) {
475 if (in_nmi())
476 bit = 0;
477
478 else if (in_irq())
479 bit = 1;
480 else
481 bit = 2;
482 } else
483 bit = 3;
484
485 return bit;
486 }
487
trace_test_and_set_recursion(int start,int max)488 static __always_inline int trace_test_and_set_recursion(int start, int max)
489 {
490 unsigned int val = current->trace_recursion;
491 int bit;
492
493 /* A previous recursion check was made */
494 if ((val & TRACE_CONTEXT_MASK) > max)
495 return 0;
496
497 bit = trace_get_context_bit() + start;
498 if (unlikely(val & (1 << bit)))
499 return -1;
500
501 val |= 1 << bit;
502 current->trace_recursion = val;
503 barrier();
504
505 return bit;
506 }
507
trace_clear_recursion(int bit)508 static __always_inline void trace_clear_recursion(int bit)
509 {
510 unsigned int val = current->trace_recursion;
511
512 if (!bit)
513 return;
514
515 bit = 1 << bit;
516 val &= ~bit;
517
518 barrier();
519 current->trace_recursion = val;
520 }
521
522 static inline struct ring_buffer_iter *
trace_buffer_iter(struct trace_iterator * iter,int cpu)523 trace_buffer_iter(struct trace_iterator *iter, int cpu)
524 {
525 if (iter->buffer_iter && iter->buffer_iter[cpu])
526 return iter->buffer_iter[cpu];
527 return NULL;
528 }
529
530 int tracer_init(struct tracer *t, struct trace_array *tr);
531 int tracing_is_enabled(void);
532 void tracing_reset(struct trace_buffer *buf, int cpu);
533 void tracing_reset_online_cpus(struct trace_buffer *buf);
534 void tracing_reset_current(int cpu);
535 void tracing_reset_all_online_cpus(void);
536 int tracing_open_generic(struct inode *inode, struct file *filp);
537 bool tracing_is_disabled(void);
538 struct dentry *trace_create_file(const char *name,
539 umode_t mode,
540 struct dentry *parent,
541 void *data,
542 const struct file_operations *fops);
543
544 struct dentry *tracing_init_dentry(void);
545
546 struct ring_buffer_event;
547
548 struct ring_buffer_event *
549 trace_buffer_lock_reserve(struct ring_buffer *buffer,
550 int type,
551 unsigned long len,
552 unsigned long flags,
553 int pc);
554
555 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,
556 struct trace_array_cpu *data);
557
558 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter,
559 int *ent_cpu, u64 *ent_ts);
560
561 void __buffer_unlock_commit(struct ring_buffer *buffer,
562 struct ring_buffer_event *event);
563
564 int trace_empty(struct trace_iterator *iter);
565
566 void *trace_find_next_entry_inc(struct trace_iterator *iter);
567
568 void trace_init_global_iter(struct trace_iterator *iter);
569
570 void tracing_iter_reset(struct trace_iterator *iter, int cpu);
571
572 void tracing_sched_switch_trace(struct trace_array *tr,
573 struct task_struct *prev,
574 struct task_struct *next,
575 unsigned long flags, int pc);
576
577 void tracing_sched_wakeup_trace(struct trace_array *tr,
578 struct task_struct *wakee,
579 struct task_struct *cur,
580 unsigned long flags, int pc);
581 void trace_function(struct trace_array *tr,
582 unsigned long ip,
583 unsigned long parent_ip,
584 unsigned long flags, int pc);
585 void trace_graph_function(struct trace_array *tr,
586 unsigned long ip,
587 unsigned long parent_ip,
588 unsigned long flags, int pc);
589 void trace_latency_header(struct seq_file *m);
590 void trace_default_header(struct seq_file *m);
591 void print_trace_header(struct seq_file *m, struct trace_iterator *iter);
592 int trace_empty(struct trace_iterator *iter);
593
594 void trace_graph_return(struct ftrace_graph_ret *trace);
595 int trace_graph_entry(struct ftrace_graph_ent *trace);
596 void set_graph_array(struct trace_array *tr);
597
598 void tracing_start_cmdline_record(void);
599 void tracing_stop_cmdline_record(void);
600 void tracing_sched_switch_assign_trace(struct trace_array *tr);
601 void tracing_stop_sched_switch_record(void);
602 void tracing_start_sched_switch_record(void);
603 int register_tracer(struct tracer *type);
604 int is_tracing_stopped(void);
605
606 loff_t tracing_lseek(struct file *file, loff_t offset, int whence);
607
608 extern cpumask_var_t __read_mostly tracing_buffer_mask;
609
610 #define for_each_tracing_cpu(cpu) \
611 for_each_cpu(cpu, tracing_buffer_mask)
612
613 extern unsigned long nsecs_to_usecs(unsigned long nsecs);
614
615 extern unsigned long tracing_thresh;
616
617 #ifdef CONFIG_TRACER_MAX_TRACE
618 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu);
619 void update_max_tr_single(struct trace_array *tr,
620 struct task_struct *tsk, int cpu);
621 #endif /* CONFIG_TRACER_MAX_TRACE */
622
623 #ifdef CONFIG_STACKTRACE
624 void ftrace_trace_stack(struct ring_buffer *buffer, unsigned long flags,
625 int skip, int pc);
626
627 void ftrace_trace_stack_regs(struct ring_buffer *buffer, unsigned long flags,
628 int skip, int pc, struct pt_regs *regs);
629
630 void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags,
631 int pc);
632
633 void __trace_stack(struct trace_array *tr, unsigned long flags, int skip,
634 int pc);
635 #else
ftrace_trace_stack(struct ring_buffer * buffer,unsigned long flags,int skip,int pc)636 static inline void ftrace_trace_stack(struct ring_buffer *buffer,
637 unsigned long flags, int skip, int pc)
638 {
639 }
640
ftrace_trace_stack_regs(struct ring_buffer * buffer,unsigned long flags,int skip,int pc,struct pt_regs * regs)641 static inline void ftrace_trace_stack_regs(struct ring_buffer *buffer,
642 unsigned long flags, int skip,
643 int pc, struct pt_regs *regs)
644 {
645 }
646
ftrace_trace_userstack(struct ring_buffer * buffer,unsigned long flags,int pc)647 static inline void ftrace_trace_userstack(struct ring_buffer *buffer,
648 unsigned long flags, int pc)
649 {
650 }
651
__trace_stack(struct trace_array * tr,unsigned long flags,int skip,int pc)652 static inline void __trace_stack(struct trace_array *tr, unsigned long flags,
653 int skip, int pc)
654 {
655 }
656 #endif /* CONFIG_STACKTRACE */
657
658 extern cycle_t ftrace_now(int cpu);
659
660 extern void trace_find_cmdline(int pid, char comm[]);
661 extern int trace_find_tgid(int pid);
662
663 #ifdef CONFIG_DYNAMIC_FTRACE
664 extern unsigned long ftrace_update_tot_cnt;
665 #endif
666 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
667 extern int DYN_FTRACE_TEST_NAME(void);
668 #define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2
669 extern int DYN_FTRACE_TEST_NAME2(void);
670
671 extern bool ring_buffer_expanded;
672 extern bool tracing_selftest_disabled;
673 DECLARE_PER_CPU(int, ftrace_cpu_disabled);
674
675 #ifdef CONFIG_FTRACE_STARTUP_TEST
676 extern int trace_selftest_startup_function(struct tracer *trace,
677 struct trace_array *tr);
678 extern int trace_selftest_startup_function_graph(struct tracer *trace,
679 struct trace_array *tr);
680 extern int trace_selftest_startup_irqsoff(struct tracer *trace,
681 struct trace_array *tr);
682 extern int trace_selftest_startup_preemptoff(struct tracer *trace,
683 struct trace_array *tr);
684 extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace,
685 struct trace_array *tr);
686 extern int trace_selftest_startup_wakeup(struct tracer *trace,
687 struct trace_array *tr);
688 extern int trace_selftest_startup_nop(struct tracer *trace,
689 struct trace_array *tr);
690 extern int trace_selftest_startup_sched_switch(struct tracer *trace,
691 struct trace_array *tr);
692 extern int trace_selftest_startup_branch(struct tracer *trace,
693 struct trace_array *tr);
694 /*
695 * Tracer data references selftest functions that only occur
696 * on boot up. These can be __init functions. Thus, when selftests
697 * are enabled, then the tracers need to reference __init functions.
698 */
699 #define __tracer_data __refdata
700 #else
701 /* Tracers are seldom changed. Optimize when selftests are disabled. */
702 #define __tracer_data __read_mostly
703 #endif /* CONFIG_FTRACE_STARTUP_TEST */
704
705 extern void *head_page(struct trace_array_cpu *data);
706 extern unsigned long long ns2usecs(cycle_t nsec);
707 extern int
708 trace_vbprintk(unsigned long ip, const char *fmt, va_list args);
709 extern int
710 trace_vprintk(unsigned long ip, const char *fmt, va_list args);
711 extern int
712 trace_array_vprintk(struct trace_array *tr,
713 unsigned long ip, const char *fmt, va_list args);
714 int trace_array_printk(struct trace_array *tr,
715 unsigned long ip, const char *fmt, ...);
716 int trace_array_printk_buf(struct ring_buffer *buffer,
717 unsigned long ip, const char *fmt, ...);
718 void trace_printk_seq(struct trace_seq *s);
719 enum print_line_t print_trace_line(struct trace_iterator *iter);
720
721 extern unsigned long trace_flags;
722
723 /* Standard output formatting function used for function return traces */
724 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
725
726 /* Flag options */
727 #define TRACE_GRAPH_PRINT_OVERRUN 0x1
728 #define TRACE_GRAPH_PRINT_CPU 0x2
729 #define TRACE_GRAPH_PRINT_OVERHEAD 0x4
730 #define TRACE_GRAPH_PRINT_PROC 0x8
731 #define TRACE_GRAPH_PRINT_DURATION 0x10
732 #define TRACE_GRAPH_PRINT_ABS_TIME 0x20
733 #define TRACE_GRAPH_PRINT_IRQS 0x40
734 #define TRACE_GRAPH_PRINT_TAIL 0x80
735 #define TRACE_GRAPH_PRINT_FILL_SHIFT 28
736 #define TRACE_GRAPH_PRINT_FILL_MASK (0x3 << TRACE_GRAPH_PRINT_FILL_SHIFT)
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 enum print_line_t
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 int ftrace_event_is_function(struct ftrace_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 * trace_iterator_flags is an enumeration that defines bit
910 * positions into trace_flags that controls the output.
911 *
912 * NOTE: These bits must match the trace_options array in
913 * trace.c.
914 */
915 enum trace_iterator_flags {
916 TRACE_ITER_PRINT_PARENT = 0x01,
917 TRACE_ITER_SYM_OFFSET = 0x02,
918 TRACE_ITER_SYM_ADDR = 0x04,
919 TRACE_ITER_VERBOSE = 0x08,
920 TRACE_ITER_RAW = 0x10,
921 TRACE_ITER_HEX = 0x20,
922 TRACE_ITER_BIN = 0x40,
923 TRACE_ITER_BLOCK = 0x80,
924 TRACE_ITER_STACKTRACE = 0x100,
925 TRACE_ITER_PRINTK = 0x200,
926 TRACE_ITER_PREEMPTONLY = 0x400,
927 TRACE_ITER_BRANCH = 0x800,
928 TRACE_ITER_ANNOTATE = 0x1000,
929 TRACE_ITER_USERSTACKTRACE = 0x2000,
930 TRACE_ITER_SYM_USEROBJ = 0x4000,
931 TRACE_ITER_PRINTK_MSGONLY = 0x8000,
932 TRACE_ITER_CONTEXT_INFO = 0x10000, /* Print pid/cpu/time */
933 TRACE_ITER_LATENCY_FMT = 0x20000,
934 TRACE_ITER_SLEEP_TIME = 0x40000,
935 TRACE_ITER_GRAPH_TIME = 0x80000,
936 TRACE_ITER_RECORD_CMD = 0x100000,
937 TRACE_ITER_OVERWRITE = 0x200000,
938 TRACE_ITER_STOP_ON_FREE = 0x400000,
939 TRACE_ITER_IRQ_INFO = 0x800000,
940 TRACE_ITER_MARKERS = 0x1000000,
941 TRACE_ITER_FUNCTION = 0x2000000,
942 TRACE_ITER_TGID = 0x4000000,
943 };
944
945 /*
946 * TRACE_ITER_SYM_MASK masks the options in trace_flags that
947 * control the output of kernel symbols.
948 */
949 #define TRACE_ITER_SYM_MASK \
950 (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR)
951
952 extern struct tracer nop_trace;
953
954 #ifdef CONFIG_BRANCH_TRACER
955 extern int enable_branch_tracing(struct trace_array *tr);
956 extern void disable_branch_tracing(void);
trace_branch_enable(struct trace_array * tr)957 static inline int trace_branch_enable(struct trace_array *tr)
958 {
959 if (trace_flags & TRACE_ITER_BRANCH)
960 return enable_branch_tracing(tr);
961 return 0;
962 }
trace_branch_disable(void)963 static inline void trace_branch_disable(void)
964 {
965 /* due to races, always disable */
966 disable_branch_tracing();
967 }
968 #else
trace_branch_enable(struct trace_array * tr)969 static inline int trace_branch_enable(struct trace_array *tr)
970 {
971 return 0;
972 }
trace_branch_disable(void)973 static inline void trace_branch_disable(void)
974 {
975 }
976 #endif /* CONFIG_BRANCH_TRACER */
977
978 /* set ring buffers to default size if not already done so */
979 int tracing_update_buffers(void);
980
981 struct ftrace_event_field {
982 struct list_head link;
983 const char *name;
984 const char *type;
985 int filter_type;
986 int offset;
987 int size;
988 int is_signed;
989 };
990
991 struct event_filter {
992 int n_preds; /* Number assigned */
993 int a_preds; /* allocated */
994 struct filter_pred *preds;
995 struct filter_pred *root;
996 char *filter_string;
997 };
998
999 struct event_subsystem {
1000 struct list_head list;
1001 const char *name;
1002 struct event_filter *filter;
1003 int ref_count;
1004 };
1005
1006 struct ftrace_subsystem_dir {
1007 struct list_head list;
1008 struct event_subsystem *subsystem;
1009 struct trace_array *tr;
1010 struct dentry *entry;
1011 int ref_count;
1012 int nr_events;
1013 };
1014
1015 #define FILTER_PRED_INVALID ((unsigned short)-1)
1016 #define FILTER_PRED_IS_RIGHT (1 << 15)
1017 #define FILTER_PRED_FOLD (1 << 15)
1018
1019 /*
1020 * The max preds is the size of unsigned short with
1021 * two flags at the MSBs. One bit is used for both the IS_RIGHT
1022 * and FOLD flags. The other is reserved.
1023 *
1024 * 2^14 preds is way more than enough.
1025 */
1026 #define MAX_FILTER_PRED 16384
1027
1028 struct filter_pred;
1029 struct regex;
1030
1031 typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event);
1032
1033 typedef int (*regex_match_func)(char *str, struct regex *r, int len);
1034
1035 enum regex_type {
1036 MATCH_FULL = 0,
1037 MATCH_FRONT_ONLY,
1038 MATCH_MIDDLE_ONLY,
1039 MATCH_END_ONLY,
1040 };
1041
1042 struct regex {
1043 char pattern[MAX_FILTER_STR_VAL];
1044 int len;
1045 int field_len;
1046 regex_match_func match;
1047 };
1048
1049 struct filter_pred {
1050 filter_pred_fn_t fn;
1051 u64 val;
1052 struct regex regex;
1053 unsigned short *ops;
1054 struct ftrace_event_field *field;
1055 int offset;
1056 int not;
1057 int op;
1058 unsigned short index;
1059 unsigned short parent;
1060 unsigned short left;
1061 unsigned short right;
1062 };
1063
1064 extern enum regex_type
1065 filter_parse_regex(char *buff, int len, char **search, int *not);
1066 extern void print_event_filter(struct ftrace_event_file *file,
1067 struct trace_seq *s);
1068 extern int apply_event_filter(struct ftrace_event_file *file,
1069 char *filter_string);
1070 extern int apply_subsystem_event_filter(struct ftrace_subsystem_dir *dir,
1071 char *filter_string);
1072 extern void print_subsystem_event_filter(struct event_subsystem *system,
1073 struct trace_seq *s);
1074 extern int filter_assign_type(const char *type);
1075 extern int create_event_filter(struct ftrace_event_call *call,
1076 char *filter_str, bool set_str,
1077 struct event_filter **filterp);
1078 extern void free_event_filter(struct event_filter *filter);
1079
1080 struct ftrace_event_field *
1081 trace_find_event_field(struct ftrace_event_call *call, char *name);
1082
1083 extern void trace_event_enable_cmd_record(bool enable);
1084 extern int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr);
1085 extern int event_trace_del_tracer(struct trace_array *tr);
1086
1087 extern struct ftrace_event_file *find_event_file(struct trace_array *tr,
1088 const char *system,
1089 const char *event);
1090
event_file_data(struct file * filp)1091 static inline void *event_file_data(struct file *filp)
1092 {
1093 return ACCESS_ONCE(file_inode(filp)->i_private);
1094 }
1095
1096 extern struct mutex event_mutex;
1097 extern struct list_head ftrace_events;
1098
1099 extern const struct file_operations event_trigger_fops;
1100
1101 extern int register_trigger_cmds(void);
1102 extern void clear_event_triggers(struct trace_array *tr);
1103
1104 struct event_trigger_data {
1105 unsigned long count;
1106 int ref;
1107 struct event_trigger_ops *ops;
1108 struct event_command *cmd_ops;
1109 struct event_filter __rcu *filter;
1110 char *filter_str;
1111 void *private_data;
1112 struct list_head list;
1113 };
1114
1115 /**
1116 * struct event_trigger_ops - callbacks for trace event triggers
1117 *
1118 * The methods in this structure provide per-event trigger hooks for
1119 * various trigger operations.
1120 *
1121 * All the methods below, except for @init() and @free(), must be
1122 * implemented.
1123 *
1124 * @func: The trigger 'probe' function called when the triggering
1125 * event occurs. The data passed into this callback is the data
1126 * that was supplied to the event_command @reg() function that
1127 * registered the trigger (see struct event_command).
1128 *
1129 * @init: An optional initialization function called for the trigger
1130 * when the trigger is registered (via the event_command reg()
1131 * function). This can be used to perform per-trigger
1132 * initialization such as incrementing a per-trigger reference
1133 * count, for instance. This is usually implemented by the
1134 * generic utility function @event_trigger_init() (see
1135 * trace_event_triggers.c).
1136 *
1137 * @free: An optional de-initialization function called for the
1138 * trigger when the trigger is unregistered (via the
1139 * event_command @reg() function). This can be used to perform
1140 * per-trigger de-initialization such as decrementing a
1141 * per-trigger reference count and freeing corresponding trigger
1142 * data, for instance. This is usually implemented by the
1143 * generic utility function @event_trigger_free() (see
1144 * trace_event_triggers.c).
1145 *
1146 * @print: The callback function invoked to have the trigger print
1147 * itself. This is usually implemented by a wrapper function
1148 * that calls the generic utility function @event_trigger_print()
1149 * (see trace_event_triggers.c).
1150 */
1151 struct event_trigger_ops {
1152 void (*func)(struct event_trigger_data *data);
1153 int (*init)(struct event_trigger_ops *ops,
1154 struct event_trigger_data *data);
1155 void (*free)(struct event_trigger_ops *ops,
1156 struct event_trigger_data *data);
1157 int (*print)(struct seq_file *m,
1158 struct event_trigger_ops *ops,
1159 struct event_trigger_data *data);
1160 };
1161
1162 /**
1163 * struct event_command - callbacks and data members for event commands
1164 *
1165 * Event commands are invoked by users by writing the command name
1166 * into the 'trigger' file associated with a trace event. The
1167 * parameters associated with a specific invocation of an event
1168 * command are used to create an event trigger instance, which is
1169 * added to the list of trigger instances associated with that trace
1170 * event. When the event is hit, the set of triggers associated with
1171 * that event is invoked.
1172 *
1173 * The data members in this structure provide per-event command data
1174 * for various event commands.
1175 *
1176 * All the data members below, except for @post_trigger, must be set
1177 * for each event command.
1178 *
1179 * @name: The unique name that identifies the event command. This is
1180 * the name used when setting triggers via trigger files.
1181 *
1182 * @trigger_type: A unique id that identifies the event command
1183 * 'type'. This value has two purposes, the first to ensure that
1184 * only one trigger of the same type can be set at a given time
1185 * for a particular event e.g. it doesn't make sense to have both
1186 * a traceon and traceoff trigger attached to a single event at
1187 * the same time, so traceon and traceoff have the same type
1188 * though they have different names. The @trigger_type value is
1189 * also used as a bit value for deferring the actual trigger
1190 * action until after the current event is finished. Some
1191 * commands need to do this if they themselves log to the trace
1192 * buffer (see the @post_trigger() member below). @trigger_type
1193 * values are defined by adding new values to the trigger_type
1194 * enum in include/linux/ftrace_event.h.
1195 *
1196 * @post_trigger: A flag that says whether or not this command needs
1197 * to have its action delayed until after the current event has
1198 * been closed. Some triggers need to avoid being invoked while
1199 * an event is currently in the process of being logged, since
1200 * the trigger may itself log data into the trace buffer. Thus
1201 * we make sure the current event is committed before invoking
1202 * those triggers. To do that, the trigger invocation is split
1203 * in two - the first part checks the filter using the current
1204 * trace record; if a command has the @post_trigger flag set, it
1205 * sets a bit for itself in the return value, otherwise it
1206 * directly invokes the trigger. Once all commands have been
1207 * either invoked or set their return flag, the current record is
1208 * either committed or discarded. At that point, if any commands
1209 * have deferred their triggers, those commands are finally
1210 * invoked following the close of the current event. In other
1211 * words, if the event_trigger_ops @func() probe implementation
1212 * itself logs to the trace buffer, this flag should be set,
1213 * otherwise it can be left unspecified.
1214 *
1215 * All the methods below, except for @set_filter(), must be
1216 * implemented.
1217 *
1218 * @func: The callback function responsible for parsing and
1219 * registering the trigger written to the 'trigger' file by the
1220 * user. It allocates the trigger instance and registers it with
1221 * the appropriate trace event. It makes use of the other
1222 * event_command callback functions to orchestrate this, and is
1223 * usually implemented by the generic utility function
1224 * @event_trigger_callback() (see trace_event_triggers.c).
1225 *
1226 * @reg: Adds the trigger to the list of triggers associated with the
1227 * event, and enables the event trigger itself, after
1228 * initializing it (via the event_trigger_ops @init() function).
1229 * This is also where commands can use the @trigger_type value to
1230 * make the decision as to whether or not multiple instances of
1231 * the trigger should be allowed. This is usually implemented by
1232 * the generic utility function @register_trigger() (see
1233 * trace_event_triggers.c).
1234 *
1235 * @unreg: Removes the trigger from the list of triggers associated
1236 * with the event, and disables the event trigger itself, after
1237 * initializing it (via the event_trigger_ops @free() function).
1238 * This is usually implemented by the generic utility function
1239 * @unregister_trigger() (see trace_event_triggers.c).
1240 *
1241 * @set_filter: An optional function called to parse and set a filter
1242 * for the trigger. If no @set_filter() method is set for the
1243 * event command, filters set by the user for the command will be
1244 * ignored. This is usually implemented by the generic utility
1245 * function @set_trigger_filter() (see trace_event_triggers.c).
1246 *
1247 * @get_trigger_ops: The callback function invoked to retrieve the
1248 * event_trigger_ops implementation associated with the command.
1249 */
1250 struct event_command {
1251 struct list_head list;
1252 char *name;
1253 enum event_trigger_type trigger_type;
1254 bool post_trigger;
1255 int (*func)(struct event_command *cmd_ops,
1256 struct ftrace_event_file *file,
1257 char *glob, char *cmd, char *params);
1258 int (*reg)(char *glob,
1259 struct event_trigger_ops *ops,
1260 struct event_trigger_data *data,
1261 struct ftrace_event_file *file);
1262 void (*unreg)(char *glob,
1263 struct event_trigger_ops *ops,
1264 struct event_trigger_data *data,
1265 struct ftrace_event_file *file);
1266 int (*set_filter)(char *filter_str,
1267 struct event_trigger_data *data,
1268 struct ftrace_event_file *file);
1269 struct event_trigger_ops *(*get_trigger_ops)(char *cmd, char *param);
1270 };
1271
1272 extern int trace_event_enable_disable(struct ftrace_event_file *file,
1273 int enable, int soft_disable);
1274 extern int tracing_alloc_snapshot(void);
1275
1276 extern const char *__start___trace_bprintk_fmt[];
1277 extern const char *__stop___trace_bprintk_fmt[];
1278
1279 extern const char *__start___tracepoint_str[];
1280 extern const char *__stop___tracepoint_str[];
1281
1282 void trace_printk_init_buffers(void);
1283 void trace_printk_start_comm(void);
1284 int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set);
1285 int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled);
1286
1287 /*
1288 * Normal trace_printk() and friends allocates special buffers
1289 * to do the manipulation, as well as saves the print formats
1290 * into sections to display. But the trace infrastructure wants
1291 * to use these without the added overhead at the price of being
1292 * a bit slower (used mainly for warnings, where we don't care
1293 * about performance). The internal_trace_puts() is for such
1294 * a purpose.
1295 */
1296 #define internal_trace_puts(str) __trace_puts(_THIS_IP_, str, strlen(str))
1297
1298 #undef FTRACE_ENTRY
1299 #define FTRACE_ENTRY(call, struct_name, id, tstruct, print, filter) \
1300 extern struct ftrace_event_call \
1301 __aligned(4) event_##call;
1302 #undef FTRACE_ENTRY_DUP
1303 #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print, filter) \
1304 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \
1305 filter)
1306 #include "trace_entries.h"
1307
1308 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER)
1309 int perf_ftrace_event_register(struct ftrace_event_call *call,
1310 enum trace_reg type, void *data);
1311 #else
1312 #define perf_ftrace_event_register NULL
1313 #endif
1314
1315 #ifdef CONFIG_FTRACE_SYSCALLS
1316 void init_ftrace_syscalls(void);
1317 #else
init_ftrace_syscalls(void)1318 static inline void init_ftrace_syscalls(void) { }
1319 #endif
1320
1321 #ifdef CONFIG_EVENT_TRACING
1322 void trace_event_init(void);
1323 #else
trace_event_init(void)1324 static inline void __init trace_event_init(void) { }
1325 #endif
1326
1327
1328 #endif /* _LINUX_KERNEL_TRACE_H */
1329