1 /*
2 * Ftrace header. For implementation details beyond the random comments
3 * scattered below, see: Documentation/trace/ftrace-design.txt
4 */
5
6 #ifndef _LINUX_FTRACE_H
7 #define _LINUX_FTRACE_H
8
9 #include <linux/trace_clock.h>
10 #include <linux/kallsyms.h>
11 #include <linux/linkage.h>
12 #include <linux/bitops.h>
13 #include <linux/ktime.h>
14 #include <linux/sched.h>
15 #include <linux/types.h>
16 #include <linux/init.h>
17 #include <linux/fs.h>
18
19 #include <asm/ftrace.h>
20
21 struct module;
22 struct ftrace_hash;
23
24 #ifdef CONFIG_FUNCTION_TRACER
25
26 extern int ftrace_enabled;
27 extern int
28 ftrace_enable_sysctl(struct ctl_table *table, int write,
29 void __user *buffer, size_t *lenp,
30 loff_t *ppos);
31
32 typedef void (*ftrace_func_t)(unsigned long ip, unsigned long parent_ip);
33
34 /*
35 * FTRACE_OPS_FL_* bits denote the state of ftrace_ops struct and are
36 * set in the flags member.
37 *
38 * ENABLED - set/unset when ftrace_ops is registered/unregistered
39 * GLOBAL - set manualy by ftrace_ops user to denote the ftrace_ops
40 * is part of the global tracers sharing the same filter
41 * via set_ftrace_* debugfs files.
42 * DYNAMIC - set when ftrace_ops is registered to denote dynamically
43 * allocated ftrace_ops which need special care
44 * CONTROL - set manualy by ftrace_ops user to denote the ftrace_ops
45 * could be controled by following calls:
46 * ftrace_function_local_enable
47 * ftrace_function_local_disable
48 */
49 enum {
50 FTRACE_OPS_FL_ENABLED = 1 << 0,
51 FTRACE_OPS_FL_GLOBAL = 1 << 1,
52 FTRACE_OPS_FL_DYNAMIC = 1 << 2,
53 FTRACE_OPS_FL_CONTROL = 1 << 3,
54 };
55
56 struct ftrace_ops {
57 ftrace_func_t func;
58 struct ftrace_ops *next;
59 unsigned long flags;
60 int __percpu *disabled;
61 #ifdef CONFIG_DYNAMIC_FTRACE
62 struct ftrace_hash *notrace_hash;
63 struct ftrace_hash *filter_hash;
64 #endif
65 };
66
67 extern int function_trace_stop;
68
69 /*
70 * Type of the current tracing.
71 */
72 enum ftrace_tracing_type_t {
73 FTRACE_TYPE_ENTER = 0, /* Hook the call of the function */
74 FTRACE_TYPE_RETURN, /* Hook the return of the function */
75 };
76
77 /* Current tracing type, default is FTRACE_TYPE_ENTER */
78 extern enum ftrace_tracing_type_t ftrace_tracing_type;
79
80 /**
81 * ftrace_stop - stop function tracer.
82 *
83 * A quick way to stop the function tracer. Note this an on off switch,
84 * it is not something that is recursive like preempt_disable.
85 * This does not disable the calling of mcount, it only stops the
86 * calling of functions from mcount.
87 */
ftrace_stop(void)88 static inline void ftrace_stop(void)
89 {
90 function_trace_stop = 1;
91 }
92
93 /**
94 * ftrace_start - start the function tracer.
95 *
96 * This function is the inverse of ftrace_stop. This does not enable
97 * the function tracing if the function tracer is disabled. This only
98 * sets the function tracer flag to continue calling the functions
99 * from mcount.
100 */
ftrace_start(void)101 static inline void ftrace_start(void)
102 {
103 function_trace_stop = 0;
104 }
105
106 /*
107 * The ftrace_ops must be a static and should also
108 * be read_mostly. These functions do modify read_mostly variables
109 * so use them sparely. Never free an ftrace_op or modify the
110 * next pointer after it has been registered. Even after unregistering
111 * it, the next pointer may still be used internally.
112 */
113 int register_ftrace_function(struct ftrace_ops *ops);
114 int unregister_ftrace_function(struct ftrace_ops *ops);
115 void clear_ftrace_function(void);
116
117 /**
118 * ftrace_function_local_enable - enable controlled ftrace_ops on current cpu
119 *
120 * This function enables tracing on current cpu by decreasing
121 * the per cpu control variable.
122 * It must be called with preemption disabled and only on ftrace_ops
123 * registered with FTRACE_OPS_FL_CONTROL. If called without preemption
124 * disabled, this_cpu_ptr will complain when CONFIG_DEBUG_PREEMPT is enabled.
125 */
ftrace_function_local_enable(struct ftrace_ops * ops)126 static inline void ftrace_function_local_enable(struct ftrace_ops *ops)
127 {
128 if (WARN_ON_ONCE(!(ops->flags & FTRACE_OPS_FL_CONTROL)))
129 return;
130
131 (*this_cpu_ptr(ops->disabled))--;
132 }
133
134 /**
135 * ftrace_function_local_disable - enable controlled ftrace_ops on current cpu
136 *
137 * This function enables tracing on current cpu by decreasing
138 * the per cpu control variable.
139 * It must be called with preemption disabled and only on ftrace_ops
140 * registered with FTRACE_OPS_FL_CONTROL. If called without preemption
141 * disabled, this_cpu_ptr will complain when CONFIG_DEBUG_PREEMPT is enabled.
142 */
ftrace_function_local_disable(struct ftrace_ops * ops)143 static inline void ftrace_function_local_disable(struct ftrace_ops *ops)
144 {
145 if (WARN_ON_ONCE(!(ops->flags & FTRACE_OPS_FL_CONTROL)))
146 return;
147
148 (*this_cpu_ptr(ops->disabled))++;
149 }
150
151 /**
152 * ftrace_function_local_disabled - returns ftrace_ops disabled value
153 * on current cpu
154 *
155 * This function returns value of ftrace_ops::disabled on current cpu.
156 * It must be called with preemption disabled and only on ftrace_ops
157 * registered with FTRACE_OPS_FL_CONTROL. If called without preemption
158 * disabled, this_cpu_ptr will complain when CONFIG_DEBUG_PREEMPT is enabled.
159 */
ftrace_function_local_disabled(struct ftrace_ops * ops)160 static inline int ftrace_function_local_disabled(struct ftrace_ops *ops)
161 {
162 WARN_ON_ONCE(!(ops->flags & FTRACE_OPS_FL_CONTROL));
163 return *this_cpu_ptr(ops->disabled);
164 }
165
166 extern void ftrace_stub(unsigned long a0, unsigned long a1);
167
168 #else /* !CONFIG_FUNCTION_TRACER */
169 /*
170 * (un)register_ftrace_function must be a macro since the ops parameter
171 * must not be evaluated.
172 */
173 #define register_ftrace_function(ops) ({ 0; })
174 #define unregister_ftrace_function(ops) ({ 0; })
clear_ftrace_function(void)175 static inline void clear_ftrace_function(void) { }
ftrace_kill(void)176 static inline void ftrace_kill(void) { }
ftrace_stop(void)177 static inline void ftrace_stop(void) { }
ftrace_start(void)178 static inline void ftrace_start(void) { }
179 #endif /* CONFIG_FUNCTION_TRACER */
180
181 #ifdef CONFIG_STACK_TRACER
182 extern int stack_tracer_enabled;
183 int
184 stack_trace_sysctl(struct ctl_table *table, int write,
185 void __user *buffer, size_t *lenp,
186 loff_t *ppos);
187 #endif
188
189 struct ftrace_func_command {
190 struct list_head list;
191 char *name;
192 int (*func)(struct ftrace_hash *hash,
193 char *func, char *cmd,
194 char *params, int enable);
195 };
196
197 #ifdef CONFIG_DYNAMIC_FTRACE
198
199 int ftrace_arch_code_modify_prepare(void);
200 int ftrace_arch_code_modify_post_process(void);
201
202 void ftrace_bug(int err, unsigned long ip);
203
204 struct seq_file;
205
206 struct ftrace_probe_ops {
207 void (*func)(unsigned long ip,
208 unsigned long parent_ip,
209 void **data);
210 int (*callback)(unsigned long ip, void **data);
211 void (*free)(void **data);
212 int (*print)(struct seq_file *m,
213 unsigned long ip,
214 struct ftrace_probe_ops *ops,
215 void *data);
216 };
217
218 extern int
219 register_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops,
220 void *data);
221 extern void
222 unregister_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops,
223 void *data);
224 extern void
225 unregister_ftrace_function_probe_func(char *glob, struct ftrace_probe_ops *ops);
226 extern void unregister_ftrace_function_probe_all(char *glob);
227
228 extern int ftrace_text_reserved(void *start, void *end);
229
230 enum {
231 FTRACE_FL_ENABLED = (1 << 30),
232 };
233
234 #define FTRACE_FL_MASK (0x3UL << 30)
235 #define FTRACE_REF_MAX ((1 << 30) - 1)
236
237 struct dyn_ftrace {
238 union {
239 unsigned long ip; /* address of mcount call-site */
240 struct dyn_ftrace *freelist;
241 };
242 unsigned long flags;
243 struct dyn_arch_ftrace arch;
244 };
245
246 int ftrace_force_update(void);
247 int ftrace_set_filter(struct ftrace_ops *ops, unsigned char *buf,
248 int len, int reset);
249 int ftrace_set_notrace(struct ftrace_ops *ops, unsigned char *buf,
250 int len, int reset);
251 void ftrace_set_global_filter(unsigned char *buf, int len, int reset);
252 void ftrace_set_global_notrace(unsigned char *buf, int len, int reset);
253 void ftrace_free_filter(struct ftrace_ops *ops);
254
255 int register_ftrace_command(struct ftrace_func_command *cmd);
256 int unregister_ftrace_command(struct ftrace_func_command *cmd);
257
258 enum {
259 FTRACE_UPDATE_CALLS = (1 << 0),
260 FTRACE_DISABLE_CALLS = (1 << 1),
261 FTRACE_UPDATE_TRACE_FUNC = (1 << 2),
262 FTRACE_START_FUNC_RET = (1 << 3),
263 FTRACE_STOP_FUNC_RET = (1 << 4),
264 };
265
266 enum {
267 FTRACE_UPDATE_IGNORE,
268 FTRACE_UPDATE_MAKE_CALL,
269 FTRACE_UPDATE_MAKE_NOP,
270 };
271
272 enum {
273 FTRACE_ITER_FILTER = (1 << 0),
274 FTRACE_ITER_NOTRACE = (1 << 1),
275 FTRACE_ITER_PRINTALL = (1 << 2),
276 FTRACE_ITER_DO_HASH = (1 << 3),
277 FTRACE_ITER_HASH = (1 << 4),
278 FTRACE_ITER_ENABLED = (1 << 5),
279 };
280
281 void arch_ftrace_update_code(int command);
282
283 struct ftrace_rec_iter;
284
285 struct ftrace_rec_iter *ftrace_rec_iter_start(void);
286 struct ftrace_rec_iter *ftrace_rec_iter_next(struct ftrace_rec_iter *iter);
287 struct dyn_ftrace *ftrace_rec_iter_record(struct ftrace_rec_iter *iter);
288
289 int ftrace_update_record(struct dyn_ftrace *rec, int enable);
290 int ftrace_test_record(struct dyn_ftrace *rec, int enable);
291 void ftrace_run_stop_machine(int command);
292 int ftrace_location(unsigned long ip);
293
294 extern ftrace_func_t ftrace_trace_function;
295
296 int ftrace_regex_open(struct ftrace_ops *ops, int flag,
297 struct inode *inode, struct file *file);
298 ssize_t ftrace_filter_write(struct file *file, const char __user *ubuf,
299 size_t cnt, loff_t *ppos);
300 ssize_t ftrace_notrace_write(struct file *file, const char __user *ubuf,
301 size_t cnt, loff_t *ppos);
302 int ftrace_regex_release(struct inode *inode, struct file *file);
303
304 void __init
305 ftrace_set_early_filter(struct ftrace_ops *ops, char *buf, int enable);
306
307 /* defined in arch */
308 extern int ftrace_ip_converted(unsigned long ip);
309 extern int ftrace_dyn_arch_init(void *data);
310 extern int ftrace_update_ftrace_func(ftrace_func_t func);
311 extern void ftrace_caller(void);
312 extern void ftrace_call(void);
313 extern void mcount_call(void);
314
315 #ifndef FTRACE_ADDR
316 #define FTRACE_ADDR ((unsigned long)ftrace_caller)
317 #endif
318 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
319 extern void ftrace_graph_caller(void);
320 extern int ftrace_enable_ftrace_graph_caller(void);
321 extern int ftrace_disable_ftrace_graph_caller(void);
322 #else
ftrace_enable_ftrace_graph_caller(void)323 static inline int ftrace_enable_ftrace_graph_caller(void) { return 0; }
ftrace_disable_ftrace_graph_caller(void)324 static inline int ftrace_disable_ftrace_graph_caller(void) { return 0; }
325 #endif
326
327 /**
328 * ftrace_make_nop - convert code into nop
329 * @mod: module structure if called by module load initialization
330 * @rec: the mcount call site record
331 * @addr: the address that the call site should be calling
332 *
333 * This is a very sensitive operation and great care needs
334 * to be taken by the arch. The operation should carefully
335 * read the location, check to see if what is read is indeed
336 * what we expect it to be, and then on success of the compare,
337 * it should write to the location.
338 *
339 * The code segment at @rec->ip should be a caller to @addr
340 *
341 * Return must be:
342 * 0 on success
343 * -EFAULT on error reading the location
344 * -EINVAL on a failed compare of the contents
345 * -EPERM on error writing to the location
346 * Any other value will be considered a failure.
347 */
348 extern int ftrace_make_nop(struct module *mod,
349 struct dyn_ftrace *rec, unsigned long addr);
350
351 /**
352 * ftrace_make_call - convert a nop call site into a call to addr
353 * @rec: the mcount call site record
354 * @addr: the address that the call site should call
355 *
356 * This is a very sensitive operation and great care needs
357 * to be taken by the arch. The operation should carefully
358 * read the location, check to see if what is read is indeed
359 * what we expect it to be, and then on success of the compare,
360 * it should write to the location.
361 *
362 * The code segment at @rec->ip should be a nop
363 *
364 * Return must be:
365 * 0 on success
366 * -EFAULT on error reading the location
367 * -EINVAL on a failed compare of the contents
368 * -EPERM on error writing to the location
369 * Any other value will be considered a failure.
370 */
371 extern int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr);
372
373 /* May be defined in arch */
374 extern int ftrace_arch_read_dyn_info(char *buf, int size);
375
376 extern int skip_trace(unsigned long ip);
377
378 extern void ftrace_disable_daemon(void);
379 extern void ftrace_enable_daemon(void);
380 #else
skip_trace(unsigned long ip)381 static inline int skip_trace(unsigned long ip) { return 0; }
ftrace_force_update(void)382 static inline int ftrace_force_update(void) { return 0; }
ftrace_disable_daemon(void)383 static inline void ftrace_disable_daemon(void) { }
ftrace_enable_daemon(void)384 static inline void ftrace_enable_daemon(void) { }
ftrace_release_mod(struct module * mod)385 static inline void ftrace_release_mod(struct module *mod) {}
register_ftrace_command(struct ftrace_func_command * cmd)386 static inline int register_ftrace_command(struct ftrace_func_command *cmd)
387 {
388 return -EINVAL;
389 }
unregister_ftrace_command(char * cmd_name)390 static inline int unregister_ftrace_command(char *cmd_name)
391 {
392 return -EINVAL;
393 }
ftrace_text_reserved(void * start,void * end)394 static inline int ftrace_text_reserved(void *start, void *end)
395 {
396 return 0;
397 }
398
399 /*
400 * Again users of functions that have ftrace_ops may not
401 * have them defined when ftrace is not enabled, but these
402 * functions may still be called. Use a macro instead of inline.
403 */
404 #define ftrace_regex_open(ops, flag, inod, file) ({ -ENODEV; })
405 #define ftrace_set_early_filter(ops, buf, enable) do { } while (0)
406 #define ftrace_set_filter(ops, buf, len, reset) ({ -ENODEV; })
407 #define ftrace_set_notrace(ops, buf, len, reset) ({ -ENODEV; })
408 #define ftrace_free_filter(ops) do { } while (0)
409
ftrace_filter_write(struct file * file,const char __user * ubuf,size_t cnt,loff_t * ppos)410 static inline ssize_t ftrace_filter_write(struct file *file, const char __user *ubuf,
411 size_t cnt, loff_t *ppos) { return -ENODEV; }
ftrace_notrace_write(struct file * file,const char __user * ubuf,size_t cnt,loff_t * ppos)412 static inline ssize_t ftrace_notrace_write(struct file *file, const char __user *ubuf,
413 size_t cnt, loff_t *ppos) { return -ENODEV; }
ftrace_regex_lseek(struct file * file,loff_t offset,int origin)414 static inline loff_t ftrace_regex_lseek(struct file *file, loff_t offset, int origin)
415 {
416 return -ENODEV;
417 }
418 static inline int
ftrace_regex_release(struct inode * inode,struct file * file)419 ftrace_regex_release(struct inode *inode, struct file *file) { return -ENODEV; }
420 #endif /* CONFIG_DYNAMIC_FTRACE */
421
422 loff_t ftrace_filter_lseek(struct file *file, loff_t offset, int whence);
423
424 /* totally disable ftrace - can not re-enable after this */
425 void ftrace_kill(void);
426
tracer_disable(void)427 static inline void tracer_disable(void)
428 {
429 #ifdef CONFIG_FUNCTION_TRACER
430 ftrace_enabled = 0;
431 #endif
432 }
433
434 /*
435 * Ftrace disable/restore without lock. Some synchronization mechanism
436 * must be used to prevent ftrace_enabled to be changed between
437 * disable/restore.
438 */
__ftrace_enabled_save(void)439 static inline int __ftrace_enabled_save(void)
440 {
441 #ifdef CONFIG_FUNCTION_TRACER
442 int saved_ftrace_enabled = ftrace_enabled;
443 ftrace_enabled = 0;
444 return saved_ftrace_enabled;
445 #else
446 return 0;
447 #endif
448 }
449
__ftrace_enabled_restore(int enabled)450 static inline void __ftrace_enabled_restore(int enabled)
451 {
452 #ifdef CONFIG_FUNCTION_TRACER
453 ftrace_enabled = enabled;
454 #endif
455 }
456
457 #ifndef HAVE_ARCH_CALLER_ADDR
458 # ifdef CONFIG_FRAME_POINTER
459 # define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0))
460 # define CALLER_ADDR1 ((unsigned long)__builtin_return_address(1))
461 # define CALLER_ADDR2 ((unsigned long)__builtin_return_address(2))
462 # define CALLER_ADDR3 ((unsigned long)__builtin_return_address(3))
463 # define CALLER_ADDR4 ((unsigned long)__builtin_return_address(4))
464 # define CALLER_ADDR5 ((unsigned long)__builtin_return_address(5))
465 # define CALLER_ADDR6 ((unsigned long)__builtin_return_address(6))
466 # else
467 # define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0))
468 # define CALLER_ADDR1 0UL
469 # define CALLER_ADDR2 0UL
470 # define CALLER_ADDR3 0UL
471 # define CALLER_ADDR4 0UL
472 # define CALLER_ADDR5 0UL
473 # define CALLER_ADDR6 0UL
474 # endif
475 #endif /* ifndef HAVE_ARCH_CALLER_ADDR */
476
477 #ifdef CONFIG_IRQSOFF_TRACER
478 extern void time_hardirqs_on(unsigned long a0, unsigned long a1);
479 extern void time_hardirqs_off(unsigned long a0, unsigned long a1);
480 #else
time_hardirqs_on(unsigned long a0,unsigned long a1)481 static inline void time_hardirqs_on(unsigned long a0, unsigned long a1) { }
time_hardirqs_off(unsigned long a0,unsigned long a1)482 static inline void time_hardirqs_off(unsigned long a0, unsigned long a1) { }
483 #endif
484
485 #ifdef CONFIG_PREEMPT_TRACER
486 extern void trace_preempt_on(unsigned long a0, unsigned long a1);
487 extern void trace_preempt_off(unsigned long a0, unsigned long a1);
488 #else
trace_preempt_on(unsigned long a0,unsigned long a1)489 static inline void trace_preempt_on(unsigned long a0, unsigned long a1) { }
trace_preempt_off(unsigned long a0,unsigned long a1)490 static inline void trace_preempt_off(unsigned long a0, unsigned long a1) { }
491 #endif
492
493 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
494 extern void ftrace_init(void);
495 #else
ftrace_init(void)496 static inline void ftrace_init(void) { }
497 #endif
498
499 /*
500 * Structure that defines an entry function trace.
501 */
502 struct ftrace_graph_ent {
503 unsigned long func; /* Current function */
504 int depth;
505 };
506
507 /*
508 * Structure that defines a return function trace.
509 */
510 struct ftrace_graph_ret {
511 unsigned long func; /* Current function */
512 unsigned long long calltime;
513 unsigned long long rettime;
514 /* Number of functions that overran the depth limit for current task */
515 unsigned long overrun;
516 int depth;
517 };
518
519 /* Type of the callback handlers for tracing function graph*/
520 typedef void (*trace_func_graph_ret_t)(struct ftrace_graph_ret *); /* return */
521 typedef int (*trace_func_graph_ent_t)(struct ftrace_graph_ent *); /* entry */
522
523 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
524
525 /* for init task */
526 #define INIT_FTRACE_GRAPH .ret_stack = NULL,
527
528 /*
529 * Stack of return addresses for functions
530 * of a thread.
531 * Used in struct thread_info
532 */
533 struct ftrace_ret_stack {
534 unsigned long ret;
535 unsigned long func;
536 unsigned long long calltime;
537 unsigned long long subtime;
538 unsigned long fp;
539 };
540
541 /*
542 * Primary handler of a function return.
543 * It relays on ftrace_return_to_handler.
544 * Defined in entry_32/64.S
545 */
546 extern void return_to_handler(void);
547
548 extern int
549 ftrace_push_return_trace(unsigned long ret, unsigned long func, int *depth,
550 unsigned long frame_pointer);
551
552 /*
553 * Sometimes we don't want to trace a function with the function
554 * graph tracer but we want them to keep traced by the usual function
555 * tracer if the function graph tracer is not configured.
556 */
557 #define __notrace_funcgraph notrace
558
559 /*
560 * We want to which function is an entrypoint of a hardirq.
561 * That will help us to put a signal on output.
562 */
563 #define __irq_entry __attribute__((__section__(".irqentry.text")))
564
565 /* Limits of hardirq entrypoints */
566 extern char __irqentry_text_start[];
567 extern char __irqentry_text_end[];
568
569 #define FTRACE_RETFUNC_DEPTH 50
570 #define FTRACE_RETSTACK_ALLOC_SIZE 32
571 extern int register_ftrace_graph(trace_func_graph_ret_t retfunc,
572 trace_func_graph_ent_t entryfunc);
573
574 extern void ftrace_graph_stop(void);
575
576 /* The current handlers in use */
577 extern trace_func_graph_ret_t ftrace_graph_return;
578 extern trace_func_graph_ent_t ftrace_graph_entry;
579
580 extern void unregister_ftrace_graph(void);
581
582 extern void ftrace_graph_init_task(struct task_struct *t);
583 extern void ftrace_graph_exit_task(struct task_struct *t);
584 extern void ftrace_graph_init_idle_task(struct task_struct *t, int cpu);
585
task_curr_ret_stack(struct task_struct * t)586 static inline int task_curr_ret_stack(struct task_struct *t)
587 {
588 return t->curr_ret_stack;
589 }
590
pause_graph_tracing(void)591 static inline void pause_graph_tracing(void)
592 {
593 atomic_inc(¤t->tracing_graph_pause);
594 }
595
unpause_graph_tracing(void)596 static inline void unpause_graph_tracing(void)
597 {
598 atomic_dec(¤t->tracing_graph_pause);
599 }
600 #else /* !CONFIG_FUNCTION_GRAPH_TRACER */
601
602 #define __notrace_funcgraph
603 #define __irq_entry
604 #define INIT_FTRACE_GRAPH
605
ftrace_graph_init_task(struct task_struct * t)606 static inline void ftrace_graph_init_task(struct task_struct *t) { }
ftrace_graph_exit_task(struct task_struct * t)607 static inline void ftrace_graph_exit_task(struct task_struct *t) { }
ftrace_graph_init_idle_task(struct task_struct * t,int cpu)608 static inline void ftrace_graph_init_idle_task(struct task_struct *t, int cpu) { }
609
register_ftrace_graph(trace_func_graph_ret_t retfunc,trace_func_graph_ent_t entryfunc)610 static inline int register_ftrace_graph(trace_func_graph_ret_t retfunc,
611 trace_func_graph_ent_t entryfunc)
612 {
613 return -1;
614 }
unregister_ftrace_graph(void)615 static inline void unregister_ftrace_graph(void) { }
616
task_curr_ret_stack(struct task_struct * tsk)617 static inline int task_curr_ret_stack(struct task_struct *tsk)
618 {
619 return -1;
620 }
621
pause_graph_tracing(void)622 static inline void pause_graph_tracing(void) { }
unpause_graph_tracing(void)623 static inline void unpause_graph_tracing(void) { }
624 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
625
626 #ifdef CONFIG_TRACING
627
628 /* flags for current->trace */
629 enum {
630 TSK_TRACE_FL_TRACE_BIT = 0,
631 TSK_TRACE_FL_GRAPH_BIT = 1,
632 };
633 enum {
634 TSK_TRACE_FL_TRACE = 1 << TSK_TRACE_FL_TRACE_BIT,
635 TSK_TRACE_FL_GRAPH = 1 << TSK_TRACE_FL_GRAPH_BIT,
636 };
637
set_tsk_trace_trace(struct task_struct * tsk)638 static inline void set_tsk_trace_trace(struct task_struct *tsk)
639 {
640 set_bit(TSK_TRACE_FL_TRACE_BIT, &tsk->trace);
641 }
642
clear_tsk_trace_trace(struct task_struct * tsk)643 static inline void clear_tsk_trace_trace(struct task_struct *tsk)
644 {
645 clear_bit(TSK_TRACE_FL_TRACE_BIT, &tsk->trace);
646 }
647
test_tsk_trace_trace(struct task_struct * tsk)648 static inline int test_tsk_trace_trace(struct task_struct *tsk)
649 {
650 return tsk->trace & TSK_TRACE_FL_TRACE;
651 }
652
set_tsk_trace_graph(struct task_struct * tsk)653 static inline void set_tsk_trace_graph(struct task_struct *tsk)
654 {
655 set_bit(TSK_TRACE_FL_GRAPH_BIT, &tsk->trace);
656 }
657
clear_tsk_trace_graph(struct task_struct * tsk)658 static inline void clear_tsk_trace_graph(struct task_struct *tsk)
659 {
660 clear_bit(TSK_TRACE_FL_GRAPH_BIT, &tsk->trace);
661 }
662
test_tsk_trace_graph(struct task_struct * tsk)663 static inline int test_tsk_trace_graph(struct task_struct *tsk)
664 {
665 return tsk->trace & TSK_TRACE_FL_GRAPH;
666 }
667
668 enum ftrace_dump_mode;
669
670 extern enum ftrace_dump_mode ftrace_dump_on_oops;
671
672 #ifdef CONFIG_PREEMPT
673 #define INIT_TRACE_RECURSION .trace_recursion = 0,
674 #endif
675
676 #endif /* CONFIG_TRACING */
677
678 #ifndef INIT_TRACE_RECURSION
679 #define INIT_TRACE_RECURSION
680 #endif
681
682 #ifdef CONFIG_FTRACE_SYSCALLS
683
684 unsigned long arch_syscall_addr(int nr);
685
686 #endif /* CONFIG_FTRACE_SYSCALLS */
687
688 #endif /* _LINUX_FTRACE_H */
689