1 #ifndef _LINUX_KERNEL_TRACE_H
2 #define _LINUX_KERNEL_TRACE_H
3
4 #include <linux/fs.h>
5 #include <linux/atomic.h>
6 #include <linux/sched.h>
7 #include <linux/clocksource.h>
8 #include <linux/ring_buffer.h>
9 #include <linux/mmiotrace.h>
10 #include <linux/tracepoint.h>
11 #include <linux/ftrace.h>
12 #include <linux/hw_breakpoint.h>
13 #include <linux/trace_seq.h>
14 #include <linux/ftrace_event.h>
15
16 #ifdef CONFIG_FTRACE_SYSCALLS
17 #include <asm/unistd.h> /* For NR_SYSCALLS */
18 #include <asm/syscall.h> /* some archs define it here */
19 #endif
20
21 enum trace_type {
22 __TRACE_FIRST_TYPE = 0,
23
24 TRACE_FN,
25 TRACE_CTX,
26 TRACE_WAKE,
27 TRACE_STACK,
28 TRACE_PRINT,
29 TRACE_BPRINT,
30 TRACE_MMIO_RW,
31 TRACE_MMIO_MAP,
32 TRACE_BRANCH,
33 TRACE_GRAPH_RET,
34 TRACE_GRAPH_ENT,
35 TRACE_USER_STACK,
36 TRACE_BLK,
37 TRACE_BPUTS,
38
39 __TRACE_LAST_TYPE,
40 };
41
42
43 #undef __field
44 #define __field(type, item) type item;
45
46 #undef __field_struct
47 #define __field_struct(type, item) __field(type, item)
48
49 #undef __field_desc
50 #define __field_desc(type, container, item)
51
52 #undef __array
53 #define __array(type, item, size) type item[size];
54
55 #undef __array_desc
56 #define __array_desc(type, container, item, size)
57
58 #undef __dynamic_array
59 #define __dynamic_array(type, item) type item[];
60
61 #undef F_STRUCT
62 #define F_STRUCT(args...) args
63
64 #undef FTRACE_ENTRY
65 #define FTRACE_ENTRY(name, struct_name, id, tstruct, print, filter) \
66 struct struct_name { \
67 struct trace_entry ent; \
68 tstruct \
69 }
70
71 #undef TP_ARGS
72 #define TP_ARGS(args...) args
73
74 #undef FTRACE_ENTRY_DUP
75 #define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk, filter)
76
77 #undef FTRACE_ENTRY_REG
78 #define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, \
79 filter, regfn) \
80 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \
81 filter)
82
83 #include "trace_entries.h"
84
85 /*
86 * 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 };
128
129 #define TRACE_BUF_SIZE 1024
130
131 struct trace_array;
132
133 struct trace_cpu {
134 struct trace_array *tr;
135 struct dentry *dir;
136 int cpu;
137 };
138
139 /*
140 * The CPU trace array - it consists of thousands of trace entries
141 * plus some other descriptor data: (for example which task started
142 * the trace, etc.)
143 */
144 struct trace_array_cpu {
145 struct trace_cpu trace_cpu;
146 atomic_t disabled;
147 void *buffer_page; /* ring buffer spare */
148
149 unsigned long entries;
150 unsigned long saved_latency;
151 unsigned long critical_start;
152 unsigned long critical_end;
153 unsigned long critical_sequence;
154 unsigned long nice;
155 unsigned long policy;
156 unsigned long rt_priority;
157 unsigned long skipped_entries;
158 cycle_t preempt_timestamp;
159 pid_t pid;
160 kuid_t uid;
161 char comm[TASK_COMM_LEN];
162 };
163
164 struct tracer;
165
166 struct trace_buffer {
167 struct trace_array *tr;
168 struct ring_buffer *buffer;
169 struct trace_array_cpu __percpu *data;
170 cycle_t time_start;
171 int cpu;
172 };
173
174 /*
175 * The trace array - an array of per-CPU trace arrays. This is the
176 * highest level data structure that individual tracers deal with.
177 * They have on/off state as well:
178 */
179 struct trace_array {
180 struct list_head list;
181 char *name;
182 struct trace_buffer trace_buffer;
183 #ifdef CONFIG_TRACER_MAX_TRACE
184 /*
185 * The max_buffer is used to snapshot the trace when a maximum
186 * latency is reached, or when the user initiates a snapshot.
187 * Some tracers will use this to store a maximum trace while
188 * it continues examining live traces.
189 *
190 * The buffers for the max_buffer are set up the same as the trace_buffer
191 * When a snapshot is taken, the buffer of the max_buffer is swapped
192 * with the buffer of the trace_buffer and the buffers are reset for
193 * the trace_buffer so the tracing can continue.
194 */
195 struct trace_buffer max_buffer;
196 bool allocated_snapshot;
197 #endif
198 int buffer_disabled;
199 struct trace_cpu trace_cpu; /* place holder */
200 #ifdef CONFIG_FTRACE_SYSCALLS
201 int sys_refcount_enter;
202 int sys_refcount_exit;
203 DECLARE_BITMAP(enabled_enter_syscalls, NR_syscalls);
204 DECLARE_BITMAP(enabled_exit_syscalls, NR_syscalls);
205 #endif
206 int stop_count;
207 int clock_id;
208 struct tracer *current_trace;
209 unsigned int flags;
210 raw_spinlock_t start_lock;
211 struct dentry *dir;
212 struct dentry *options;
213 struct dentry *percpu_dir;
214 struct dentry *event_dir;
215 struct list_head systems;
216 struct list_head events;
217 struct task_struct *waiter;
218 int ref;
219 };
220
221 enum {
222 TRACE_ARRAY_FL_GLOBAL = (1 << 0)
223 };
224
225 extern struct list_head ftrace_trace_arrays;
226
227 /*
228 * The global tracer (top) should be the first trace array added,
229 * but we check the flag anyway.
230 */
top_trace_array(void)231 static inline struct trace_array *top_trace_array(void)
232 {
233 struct trace_array *tr;
234
235 tr = list_entry(ftrace_trace_arrays.prev,
236 typeof(*tr), list);
237 WARN_ON(!(tr->flags & TRACE_ARRAY_FL_GLOBAL));
238 return tr;
239 }
240
241 #define FTRACE_CMP_TYPE(var, type) \
242 __builtin_types_compatible_p(typeof(var), type *)
243
244 #undef IF_ASSIGN
245 #define IF_ASSIGN(var, entry, etype, id) \
246 if (FTRACE_CMP_TYPE(var, etype)) { \
247 var = (typeof(var))(entry); \
248 WARN_ON(id && (entry)->type != id); \
249 break; \
250 }
251
252 /* Will cause compile errors if type is not found. */
253 extern void __ftrace_bad_type(void);
254
255 /*
256 * The trace_assign_type is a verifier that the entry type is
257 * the same as the type being assigned. To add new types simply
258 * add a line with the following format:
259 *
260 * IF_ASSIGN(var, ent, type, id);
261 *
262 * Where "type" is the trace type that includes the trace_entry
263 * as the "ent" item. And "id" is the trace identifier that is
264 * used in the trace_type enum.
265 *
266 * If the type can have more than one id, then use zero.
267 */
268 #define trace_assign_type(var, ent) \
269 do { \
270 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \
271 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \
272 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \
273 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\
274 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \
275 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \
276 IF_ASSIGN(var, ent, struct bputs_entry, TRACE_BPUTS); \
277 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \
278 TRACE_MMIO_RW); \
279 IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \
280 TRACE_MMIO_MAP); \
281 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \
282 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \
283 TRACE_GRAPH_ENT); \
284 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \
285 TRACE_GRAPH_RET); \
286 __ftrace_bad_type(); \
287 } while (0)
288
289 /*
290 * An option specific to a tracer. This is a boolean value.
291 * The bit is the bit index that sets its value on the
292 * flags value in struct tracer_flags.
293 */
294 struct tracer_opt {
295 const char *name; /* Will appear on the trace_options file */
296 u32 bit; /* Mask assigned in val field in tracer_flags */
297 };
298
299 /*
300 * The set of specific options for a tracer. Your tracer
301 * have to set the initial value of the flags val.
302 */
303 struct tracer_flags {
304 u32 val;
305 struct tracer_opt *opts;
306 };
307
308 /* Makes more easy to define a tracer opt */
309 #define TRACER_OPT(s, b) .name = #s, .bit = b
310
311
312 /**
313 * struct tracer - a specific tracer and its callbacks to interact with debugfs
314 * @name: the name chosen to select it on the available_tracers file
315 * @init: called when one switches to this tracer (echo name > current_tracer)
316 * @reset: called when one switches to another tracer
317 * @start: called when tracing is unpaused (echo 1 > tracing_enabled)
318 * @stop: called when tracing is paused (echo 0 > tracing_enabled)
319 * @open: called when the trace file is opened
320 * @pipe_open: called when the trace_pipe file is opened
321 * @wait_pipe: override how the user waits for traces on trace_pipe
322 * @close: called when the trace file is released
323 * @pipe_close: called when the trace_pipe file is released
324 * @read: override the default read callback on trace_pipe
325 * @splice_read: override the default splice_read callback on trace_pipe
326 * @selftest: selftest to run on boot (see trace_selftest.c)
327 * @print_headers: override the first lines that describe your columns
328 * @print_line: callback that prints a trace
329 * @set_flag: signals one of your private flags changed (trace_options file)
330 * @flags: your private flags
331 */
332 struct tracer {
333 const char *name;
334 int (*init)(struct trace_array *tr);
335 void (*reset)(struct trace_array *tr);
336 void (*start)(struct trace_array *tr);
337 void (*stop)(struct trace_array *tr);
338 void (*open)(struct trace_iterator *iter);
339 void (*pipe_open)(struct trace_iterator *iter);
340 void (*wait_pipe)(struct trace_iterator *iter);
341 void (*close)(struct trace_iterator *iter);
342 void (*pipe_close)(struct trace_iterator *iter);
343 ssize_t (*read)(struct trace_iterator *iter,
344 struct file *filp, char __user *ubuf,
345 size_t cnt, loff_t *ppos);
346 ssize_t (*splice_read)(struct trace_iterator *iter,
347 struct file *filp,
348 loff_t *ppos,
349 struct pipe_inode_info *pipe,
350 size_t len,
351 unsigned int flags);
352 #ifdef CONFIG_FTRACE_STARTUP_TEST
353 int (*selftest)(struct tracer *trace,
354 struct trace_array *tr);
355 #endif
356 void (*print_header)(struct seq_file *m);
357 enum print_line_t (*print_line)(struct trace_iterator *iter);
358 /* If you handled the flag setting, return 0 */
359 int (*set_flag)(u32 old_flags, u32 bit, int set);
360 /* Return 0 if OK with change, else return non-zero */
361 int (*flag_changed)(struct tracer *tracer,
362 u32 mask, int set);
363 struct tracer *next;
364 struct tracer_flags *flags;
365 bool print_max;
366 bool enabled;
367 #ifdef CONFIG_TRACER_MAX_TRACE
368 bool use_max_tr;
369 #endif
370 };
371
372
373 /* Only current can touch trace_recursion */
374
375 /*
376 * For function tracing recursion:
377 * The order of these bits are important.
378 *
379 * When function tracing occurs, the following steps are made:
380 * If arch does not support a ftrace feature:
381 * call internal function (uses INTERNAL bits) which calls...
382 * If callback is registered to the "global" list, the list
383 * function is called and recursion checks the GLOBAL bits.
384 * then this function calls...
385 * The function callback, which can use the FTRACE bits to
386 * check for recursion.
387 *
388 * Now if the arch does not suppport a feature, and it calls
389 * the global list function which calls the ftrace callback
390 * all three of these steps will do a recursion protection.
391 * There's no reason to do one if the previous caller already
392 * did. The recursion that we are protecting against will
393 * go through the same steps again.
394 *
395 * To prevent the multiple recursion checks, if a recursion
396 * bit is set that is higher than the MAX bit of the current
397 * check, then we know that the check was made by the previous
398 * caller, and we can skip the current check.
399 */
400 enum {
401 TRACE_BUFFER_BIT,
402 TRACE_BUFFER_NMI_BIT,
403 TRACE_BUFFER_IRQ_BIT,
404 TRACE_BUFFER_SIRQ_BIT,
405
406 /* Start of function recursion bits */
407 TRACE_FTRACE_BIT,
408 TRACE_FTRACE_NMI_BIT,
409 TRACE_FTRACE_IRQ_BIT,
410 TRACE_FTRACE_SIRQ_BIT,
411
412 /* GLOBAL_BITs must be greater than FTRACE_BITs */
413 TRACE_GLOBAL_BIT,
414 TRACE_GLOBAL_NMI_BIT,
415 TRACE_GLOBAL_IRQ_BIT,
416 TRACE_GLOBAL_SIRQ_BIT,
417
418 /* INTERNAL_BITs must be greater than GLOBAL_BITs */
419 TRACE_INTERNAL_BIT,
420 TRACE_INTERNAL_NMI_BIT,
421 TRACE_INTERNAL_IRQ_BIT,
422 TRACE_INTERNAL_SIRQ_BIT,
423
424 TRACE_CONTROL_BIT,
425
426 /*
427 * Abuse of the trace_recursion.
428 * As we need a way to maintain state if we are tracing the function
429 * graph in irq because we want to trace a particular function that
430 * was called in irq context but we have irq tracing off. Since this
431 * can only be modified by current, we can reuse trace_recursion.
432 */
433 TRACE_IRQ_BIT,
434 };
435
436 #define trace_recursion_set(bit) do { (current)->trace_recursion |= (1<<(bit)); } while (0)
437 #define trace_recursion_clear(bit) do { (current)->trace_recursion &= ~(1<<(bit)); } while (0)
438 #define trace_recursion_test(bit) ((current)->trace_recursion & (1<<(bit)))
439
440 #define TRACE_CONTEXT_BITS 4
441
442 #define TRACE_FTRACE_START TRACE_FTRACE_BIT
443 #define TRACE_FTRACE_MAX ((1 << (TRACE_FTRACE_START + TRACE_CONTEXT_BITS)) - 1)
444
445 #define TRACE_GLOBAL_START TRACE_GLOBAL_BIT
446 #define TRACE_GLOBAL_MAX ((1 << (TRACE_GLOBAL_START + TRACE_CONTEXT_BITS)) - 1)
447
448 #define TRACE_LIST_START TRACE_INTERNAL_BIT
449 #define TRACE_LIST_MAX ((1 << (TRACE_LIST_START + TRACE_CONTEXT_BITS)) - 1)
450
451 #define TRACE_CONTEXT_MASK TRACE_LIST_MAX
452
trace_get_context_bit(void)453 static __always_inline int trace_get_context_bit(void)
454 {
455 int bit;
456
457 if (in_interrupt()) {
458 if (in_nmi())
459 bit = 0;
460
461 else if (in_irq())
462 bit = 1;
463 else
464 bit = 2;
465 } else
466 bit = 3;
467
468 return bit;
469 }
470
trace_test_and_set_recursion(int start,int max)471 static __always_inline int trace_test_and_set_recursion(int start, int max)
472 {
473 unsigned int val = current->trace_recursion;
474 int bit;
475
476 /* A previous recursion check was made */
477 if ((val & TRACE_CONTEXT_MASK) > max)
478 return 0;
479
480 bit = trace_get_context_bit() + start;
481 if (unlikely(val & (1 << bit)))
482 return -1;
483
484 val |= 1 << bit;
485 current->trace_recursion = val;
486 barrier();
487
488 return bit;
489 }
490
trace_clear_recursion(int bit)491 static __always_inline void trace_clear_recursion(int bit)
492 {
493 unsigned int val = current->trace_recursion;
494
495 if (!bit)
496 return;
497
498 bit = 1 << bit;
499 val &= ~bit;
500
501 barrier();
502 current->trace_recursion = val;
503 }
504
505 static inline struct ring_buffer_iter *
trace_buffer_iter(struct trace_iterator * iter,int cpu)506 trace_buffer_iter(struct trace_iterator *iter, int cpu)
507 {
508 if (iter->buffer_iter && iter->buffer_iter[cpu])
509 return iter->buffer_iter[cpu];
510 return NULL;
511 }
512
513 int tracer_init(struct tracer *t, struct trace_array *tr);
514 int tracing_is_enabled(void);
515 void tracing_reset(struct trace_buffer *buf, int cpu);
516 void tracing_reset_online_cpus(struct trace_buffer *buf);
517 void tracing_reset_current(int cpu);
518 void tracing_reset_all_online_cpus(void);
519 int tracing_open_generic(struct inode *inode, struct file *filp);
520 struct dentry *trace_create_file(const char *name,
521 umode_t mode,
522 struct dentry *parent,
523 void *data,
524 const struct file_operations *fops);
525
526 struct dentry *tracing_init_dentry_tr(struct trace_array *tr);
527 struct dentry *tracing_init_dentry(void);
528
529 struct ring_buffer_event;
530
531 struct ring_buffer_event *
532 trace_buffer_lock_reserve(struct ring_buffer *buffer,
533 int type,
534 unsigned long len,
535 unsigned long flags,
536 int pc);
537
538 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,
539 struct trace_array_cpu *data);
540
541 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter,
542 int *ent_cpu, u64 *ent_ts);
543
544 void __buffer_unlock_commit(struct ring_buffer *buffer,
545 struct ring_buffer_event *event);
546
547 int trace_empty(struct trace_iterator *iter);
548
549 void *trace_find_next_entry_inc(struct trace_iterator *iter);
550
551 void trace_init_global_iter(struct trace_iterator *iter);
552
553 void tracing_iter_reset(struct trace_iterator *iter, int cpu);
554
555 void poll_wait_pipe(struct trace_iterator *iter);
556
557 void ftrace(struct trace_array *tr,
558 struct trace_array_cpu *data,
559 unsigned long ip,
560 unsigned long parent_ip,
561 unsigned long flags, int pc);
562 void tracing_sched_switch_trace(struct trace_array *tr,
563 struct task_struct *prev,
564 struct task_struct *next,
565 unsigned long flags, int pc);
566
567 void tracing_sched_wakeup_trace(struct trace_array *tr,
568 struct task_struct *wakee,
569 struct task_struct *cur,
570 unsigned long flags, int pc);
571 void trace_function(struct trace_array *tr,
572 unsigned long ip,
573 unsigned long parent_ip,
574 unsigned long flags, int pc);
575 void trace_graph_function(struct trace_array *tr,
576 unsigned long ip,
577 unsigned long parent_ip,
578 unsigned long flags, int pc);
579 void trace_latency_header(struct seq_file *m);
580 void trace_default_header(struct seq_file *m);
581 void print_trace_header(struct seq_file *m, struct trace_iterator *iter);
582 int trace_empty(struct trace_iterator *iter);
583
584 void trace_graph_return(struct ftrace_graph_ret *trace);
585 int trace_graph_entry(struct ftrace_graph_ent *trace);
586 void set_graph_array(struct trace_array *tr);
587
588 void tracing_start_cmdline_record(void);
589 void tracing_stop_cmdline_record(void);
590 void tracing_sched_switch_assign_trace(struct trace_array *tr);
591 void tracing_stop_sched_switch_record(void);
592 void tracing_start_sched_switch_record(void);
593 int register_tracer(struct tracer *type);
594 int is_tracing_stopped(void);
595
596 extern cpumask_var_t __read_mostly tracing_buffer_mask;
597
598 #define for_each_tracing_cpu(cpu) \
599 for_each_cpu(cpu, tracing_buffer_mask)
600
601 extern unsigned long nsecs_to_usecs(unsigned long nsecs);
602
603 extern unsigned long tracing_thresh;
604
605 #ifdef CONFIG_TRACER_MAX_TRACE
606 extern unsigned long tracing_max_latency;
607
608 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu);
609 void update_max_tr_single(struct trace_array *tr,
610 struct task_struct *tsk, int cpu);
611 #endif /* CONFIG_TRACER_MAX_TRACE */
612
613 #ifdef CONFIG_STACKTRACE
614 void ftrace_trace_stack(struct ring_buffer *buffer, unsigned long flags,
615 int skip, int pc);
616
617 void ftrace_trace_stack_regs(struct ring_buffer *buffer, unsigned long flags,
618 int skip, int pc, struct pt_regs *regs);
619
620 void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags,
621 int pc);
622
623 void __trace_stack(struct trace_array *tr, unsigned long flags, int skip,
624 int pc);
625 #else
ftrace_trace_stack(struct ring_buffer * buffer,unsigned long flags,int skip,int pc)626 static inline void ftrace_trace_stack(struct ring_buffer *buffer,
627 unsigned long flags, int skip, int pc)
628 {
629 }
630
ftrace_trace_stack_regs(struct ring_buffer * buffer,unsigned long flags,int skip,int pc,struct pt_regs * regs)631 static inline void ftrace_trace_stack_regs(struct ring_buffer *buffer,
632 unsigned long flags, int skip,
633 int pc, struct pt_regs *regs)
634 {
635 }
636
ftrace_trace_userstack(struct ring_buffer * buffer,unsigned long flags,int pc)637 static inline void ftrace_trace_userstack(struct ring_buffer *buffer,
638 unsigned long flags, int pc)
639 {
640 }
641
__trace_stack(struct trace_array * tr,unsigned long flags,int skip,int pc)642 static inline void __trace_stack(struct trace_array *tr, unsigned long flags,
643 int skip, int pc)
644 {
645 }
646 #endif /* CONFIG_STACKTRACE */
647
648 extern cycle_t ftrace_now(int cpu);
649
650 extern void trace_find_cmdline(int pid, char comm[]);
651 extern int trace_find_tgid(int pid);
652
653 #ifdef CONFIG_DYNAMIC_FTRACE
654 extern unsigned long ftrace_update_tot_cnt;
655 #endif
656 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
657 extern int DYN_FTRACE_TEST_NAME(void);
658 #define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2
659 extern int DYN_FTRACE_TEST_NAME2(void);
660
661 extern bool ring_buffer_expanded;
662 extern bool tracing_selftest_disabled;
663 DECLARE_PER_CPU(int, ftrace_cpu_disabled);
664
665 #ifdef CONFIG_FTRACE_STARTUP_TEST
666 extern int trace_selftest_startup_function(struct tracer *trace,
667 struct trace_array *tr);
668 extern int trace_selftest_startup_function_graph(struct tracer *trace,
669 struct trace_array *tr);
670 extern int trace_selftest_startup_irqsoff(struct tracer *trace,
671 struct trace_array *tr);
672 extern int trace_selftest_startup_preemptoff(struct tracer *trace,
673 struct trace_array *tr);
674 extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace,
675 struct trace_array *tr);
676 extern int trace_selftest_startup_wakeup(struct tracer *trace,
677 struct trace_array *tr);
678 extern int trace_selftest_startup_nop(struct tracer *trace,
679 struct trace_array *tr);
680 extern int trace_selftest_startup_sched_switch(struct tracer *trace,
681 struct trace_array *tr);
682 extern int trace_selftest_startup_branch(struct tracer *trace,
683 struct trace_array *tr);
684 #endif /* CONFIG_FTRACE_STARTUP_TEST */
685
686 extern void *head_page(struct trace_array_cpu *data);
687 extern unsigned long long ns2usecs(cycle_t nsec);
688 extern int
689 trace_vbprintk(unsigned long ip, const char *fmt, va_list args);
690 extern int
691 trace_vprintk(unsigned long ip, const char *fmt, va_list args);
692 extern int
693 trace_array_vprintk(struct trace_array *tr,
694 unsigned long ip, const char *fmt, va_list args);
695 int trace_array_printk(struct trace_array *tr,
696 unsigned long ip, const char *fmt, ...);
697 int trace_array_printk_buf(struct ring_buffer *buffer,
698 unsigned long ip, const char *fmt, ...);
699 void trace_printk_seq(struct trace_seq *s);
700 enum print_line_t print_trace_line(struct trace_iterator *iter);
701
702 extern unsigned long trace_flags;
703
704 /* Standard output formatting function used for function return traces */
705 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
706
707 /* Flag options */
708 #define TRACE_GRAPH_PRINT_OVERRUN 0x1
709 #define TRACE_GRAPH_PRINT_CPU 0x2
710 #define TRACE_GRAPH_PRINT_OVERHEAD 0x4
711 #define TRACE_GRAPH_PRINT_PROC 0x8
712 #define TRACE_GRAPH_PRINT_DURATION 0x10
713 #define TRACE_GRAPH_PRINT_ABS_TIME 0x20
714
715 extern enum print_line_t
716 print_graph_function_flags(struct trace_iterator *iter, u32 flags);
717 extern void print_graph_headers_flags(struct seq_file *s, u32 flags);
718 extern enum print_line_t
719 trace_print_graph_duration(unsigned long long duration, struct trace_seq *s);
720 extern void graph_trace_open(struct trace_iterator *iter);
721 extern void graph_trace_close(struct trace_iterator *iter);
722 extern int __trace_graph_entry(struct trace_array *tr,
723 struct ftrace_graph_ent *trace,
724 unsigned long flags, int pc);
725 extern void __trace_graph_return(struct trace_array *tr,
726 struct ftrace_graph_ret *trace,
727 unsigned long flags, int pc);
728
729
730 #ifdef CONFIG_DYNAMIC_FTRACE
731 /* TODO: make this variable */
732 #define FTRACE_GRAPH_MAX_FUNCS 32
733 extern int ftrace_graph_filter_enabled;
734 extern int ftrace_graph_count;
735 extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS];
736
ftrace_graph_addr(unsigned long addr)737 static inline int ftrace_graph_addr(unsigned long addr)
738 {
739 int i;
740
741 if (!ftrace_graph_filter_enabled)
742 return 1;
743
744 for (i = 0; i < ftrace_graph_count; i++) {
745 if (addr == ftrace_graph_funcs[i]) {
746 /*
747 * If no irqs are to be traced, but a set_graph_function
748 * is set, and called by an interrupt handler, we still
749 * want to trace it.
750 */
751 if (in_irq())
752 trace_recursion_set(TRACE_IRQ_BIT);
753 else
754 trace_recursion_clear(TRACE_IRQ_BIT);
755 return 1;
756 }
757 }
758
759 return 0;
760 }
761 #else
ftrace_graph_addr(unsigned long addr)762 static inline int ftrace_graph_addr(unsigned long addr)
763 {
764 return 1;
765 }
766 #endif /* CONFIG_DYNAMIC_FTRACE */
767 #else /* CONFIG_FUNCTION_GRAPH_TRACER */
768 static inline enum print_line_t
print_graph_function_flags(struct trace_iterator * iter,u32 flags)769 print_graph_function_flags(struct trace_iterator *iter, u32 flags)
770 {
771 return TRACE_TYPE_UNHANDLED;
772 }
773 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
774
775 extern struct list_head ftrace_pids;
776
777 #ifdef CONFIG_FUNCTION_TRACER
ftrace_trace_task(struct task_struct * task)778 static inline int ftrace_trace_task(struct task_struct *task)
779 {
780 if (list_empty(&ftrace_pids))
781 return 1;
782
783 return test_tsk_trace_trace(task);
784 }
785 extern int ftrace_is_dead(void);
786 #else
ftrace_trace_task(struct task_struct * task)787 static inline int ftrace_trace_task(struct task_struct *task)
788 {
789 return 1;
790 }
ftrace_is_dead(void)791 static inline int ftrace_is_dead(void) { return 0; }
792 #endif
793
794 int ftrace_event_is_function(struct ftrace_event_call *call);
795
796 /*
797 * struct trace_parser - servers for reading the user input separated by spaces
798 * @cont: set if the input is not complete - no final space char was found
799 * @buffer: holds the parsed user input
800 * @idx: user input length
801 * @size: buffer size
802 */
803 struct trace_parser {
804 bool cont;
805 char *buffer;
806 unsigned idx;
807 unsigned size;
808 };
809
trace_parser_loaded(struct trace_parser * parser)810 static inline bool trace_parser_loaded(struct trace_parser *parser)
811 {
812 return (parser->idx != 0);
813 }
814
trace_parser_cont(struct trace_parser * parser)815 static inline bool trace_parser_cont(struct trace_parser *parser)
816 {
817 return parser->cont;
818 }
819
trace_parser_clear(struct trace_parser * parser)820 static inline void trace_parser_clear(struct trace_parser *parser)
821 {
822 parser->cont = false;
823 parser->idx = 0;
824 }
825
826 extern int trace_parser_get_init(struct trace_parser *parser, int size);
827 extern void trace_parser_put(struct trace_parser *parser);
828 extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
829 size_t cnt, loff_t *ppos);
830
831 /*
832 * trace_iterator_flags is an enumeration that defines bit
833 * positions into trace_flags that controls the output.
834 *
835 * NOTE: These bits must match the trace_options array in
836 * trace.c.
837 */
838 enum trace_iterator_flags {
839 TRACE_ITER_PRINT_PARENT = 0x01,
840 TRACE_ITER_SYM_OFFSET = 0x02,
841 TRACE_ITER_SYM_ADDR = 0x04,
842 TRACE_ITER_VERBOSE = 0x08,
843 TRACE_ITER_RAW = 0x10,
844 TRACE_ITER_HEX = 0x20,
845 TRACE_ITER_BIN = 0x40,
846 TRACE_ITER_BLOCK = 0x80,
847 TRACE_ITER_STACKTRACE = 0x100,
848 TRACE_ITER_PRINTK = 0x200,
849 TRACE_ITER_PREEMPTONLY = 0x400,
850 TRACE_ITER_BRANCH = 0x800,
851 TRACE_ITER_ANNOTATE = 0x1000,
852 TRACE_ITER_USERSTACKTRACE = 0x2000,
853 TRACE_ITER_SYM_USEROBJ = 0x4000,
854 TRACE_ITER_PRINTK_MSGONLY = 0x8000,
855 TRACE_ITER_CONTEXT_INFO = 0x10000, /* Print pid/cpu/time */
856 TRACE_ITER_LATENCY_FMT = 0x20000,
857 TRACE_ITER_SLEEP_TIME = 0x40000,
858 TRACE_ITER_GRAPH_TIME = 0x80000,
859 TRACE_ITER_RECORD_CMD = 0x100000,
860 TRACE_ITER_OVERWRITE = 0x200000,
861 TRACE_ITER_STOP_ON_FREE = 0x400000,
862 TRACE_ITER_IRQ_INFO = 0x800000,
863 TRACE_ITER_MARKERS = 0x1000000,
864 TRACE_ITER_FUNCTION = 0x2000000,
865 TRACE_ITER_TGID = 0x4000000,
866 };
867
868 /*
869 * TRACE_ITER_SYM_MASK masks the options in trace_flags that
870 * control the output of kernel symbols.
871 */
872 #define TRACE_ITER_SYM_MASK \
873 (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR)
874
875 extern struct tracer nop_trace;
876
877 #ifdef CONFIG_BRANCH_TRACER
878 extern int enable_branch_tracing(struct trace_array *tr);
879 extern void disable_branch_tracing(void);
trace_branch_enable(struct trace_array * tr)880 static inline int trace_branch_enable(struct trace_array *tr)
881 {
882 if (trace_flags & TRACE_ITER_BRANCH)
883 return enable_branch_tracing(tr);
884 return 0;
885 }
trace_branch_disable(void)886 static inline void trace_branch_disable(void)
887 {
888 /* due to races, always disable */
889 disable_branch_tracing();
890 }
891 #else
trace_branch_enable(struct trace_array * tr)892 static inline int trace_branch_enable(struct trace_array *tr)
893 {
894 return 0;
895 }
trace_branch_disable(void)896 static inline void trace_branch_disable(void)
897 {
898 }
899 #endif /* CONFIG_BRANCH_TRACER */
900
901 /* set ring buffers to default size if not already done so */
902 int tracing_update_buffers(void);
903
904 /* trace event type bit fields, not numeric */
905 enum {
906 TRACE_EVENT_TYPE_PRINTF = 1,
907 TRACE_EVENT_TYPE_RAW = 2,
908 };
909
910 struct ftrace_event_field {
911 struct list_head link;
912 const char *name;
913 const char *type;
914 int filter_type;
915 int offset;
916 int size;
917 int is_signed;
918 };
919
920 struct event_filter {
921 int n_preds; /* Number assigned */
922 int a_preds; /* allocated */
923 struct filter_pred *preds;
924 struct filter_pred *root;
925 char *filter_string;
926 };
927
928 struct event_subsystem {
929 struct list_head list;
930 const char *name;
931 struct event_filter *filter;
932 int ref_count;
933 };
934
935 struct ftrace_subsystem_dir {
936 struct list_head list;
937 struct event_subsystem *subsystem;
938 struct trace_array *tr;
939 struct dentry *entry;
940 int ref_count;
941 int nr_events;
942 };
943
944 #define FILTER_PRED_INVALID ((unsigned short)-1)
945 #define FILTER_PRED_IS_RIGHT (1 << 15)
946 #define FILTER_PRED_FOLD (1 << 15)
947
948 /*
949 * The max preds is the size of unsigned short with
950 * two flags at the MSBs. One bit is used for both the IS_RIGHT
951 * and FOLD flags. The other is reserved.
952 *
953 * 2^14 preds is way more than enough.
954 */
955 #define MAX_FILTER_PRED 16384
956
957 struct filter_pred;
958 struct regex;
959
960 typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event);
961
962 typedef int (*regex_match_func)(char *str, struct regex *r, int len);
963
964 enum regex_type {
965 MATCH_FULL = 0,
966 MATCH_FRONT_ONLY,
967 MATCH_MIDDLE_ONLY,
968 MATCH_END_ONLY,
969 };
970
971 struct regex {
972 char pattern[MAX_FILTER_STR_VAL];
973 int len;
974 int field_len;
975 regex_match_func match;
976 };
977
978 struct filter_pred {
979 filter_pred_fn_t fn;
980 u64 val;
981 struct regex regex;
982 unsigned short *ops;
983 struct ftrace_event_field *field;
984 int offset;
985 int not;
986 int op;
987 unsigned short index;
988 unsigned short parent;
989 unsigned short left;
990 unsigned short right;
991 };
992
993 extern enum regex_type
994 filter_parse_regex(char *buff, int len, char **search, int *not);
995 extern void print_event_filter(struct ftrace_event_call *call,
996 struct trace_seq *s);
997 extern int apply_event_filter(struct ftrace_event_call *call,
998 char *filter_string);
999 extern int apply_subsystem_event_filter(struct ftrace_subsystem_dir *dir,
1000 char *filter_string);
1001 extern void print_subsystem_event_filter(struct event_subsystem *system,
1002 struct trace_seq *s);
1003 extern int filter_assign_type(const char *type);
1004
1005 struct ftrace_event_field *
1006 trace_find_event_field(struct ftrace_event_call *call, char *name);
1007
1008 static inline int
filter_check_discard(struct ftrace_event_call * call,void * rec,struct ring_buffer * buffer,struct ring_buffer_event * event)1009 filter_check_discard(struct ftrace_event_call *call, void *rec,
1010 struct ring_buffer *buffer,
1011 struct ring_buffer_event *event)
1012 {
1013 if (unlikely(call->flags & TRACE_EVENT_FL_FILTERED) &&
1014 !filter_match_preds(call->filter, rec)) {
1015 ring_buffer_discard_commit(buffer, event);
1016 return 1;
1017 }
1018
1019 return 0;
1020 }
1021
1022 extern void trace_event_enable_cmd_record(bool enable);
1023 extern int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr);
1024 extern int event_trace_del_tracer(struct trace_array *tr);
1025
1026 extern struct mutex event_mutex;
1027 extern struct list_head ftrace_events;
1028
1029 extern const char *__start___trace_bprintk_fmt[];
1030 extern const char *__stop___trace_bprintk_fmt[];
1031
1032 void trace_printk_init_buffers(void);
1033 void trace_printk_start_comm(void);
1034 int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set);
1035 int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled);
1036
1037 /*
1038 * Normal trace_printk() and friends allocates special buffers
1039 * to do the manipulation, as well as saves the print formats
1040 * into sections to display. But the trace infrastructure wants
1041 * to use these without the added overhead at the price of being
1042 * a bit slower (used mainly for warnings, where we don't care
1043 * about performance). The internal_trace_puts() is for such
1044 * a purpose.
1045 */
1046 #define internal_trace_puts(str) __trace_puts(_THIS_IP_, str, strlen(str))
1047
1048 #undef FTRACE_ENTRY
1049 #define FTRACE_ENTRY(call, struct_name, id, tstruct, print, filter) \
1050 extern struct ftrace_event_call \
1051 __attribute__((__aligned__(4))) event_##call;
1052 #undef FTRACE_ENTRY_DUP
1053 #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print, filter) \
1054 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \
1055 filter)
1056 #include "trace_entries.h"
1057
1058 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER)
1059 int perf_ftrace_event_register(struct ftrace_event_call *call,
1060 enum trace_reg type, void *data);
1061 #else
1062 #define perf_ftrace_event_register NULL
1063 #endif
1064
1065 #endif /* _LINUX_KERNEL_TRACE_H */
1066