2 * Ftrace header. For implementation details beyond the random comments
3 * scattered below, see: Documentation/trace/ftrace-design.txt
6 #ifndef _LINUX_FTRACE_H
7 #define _LINUX_FTRACE_H
9 #include <linux/trace_clock.h>
10 #include <linux/kallsyms.h>
11 #include <linux/linkage.h>
12 #include <linux/bitops.h>
13 #include <linux/ptrace.h>
14 #include <linux/ktime.h>
15 #include <linux/sched.h>
16 #include <linux/types.h>
17 #include <linux/init.h>
20 #include <asm/ftrace.h>
23 * If the arch supports passing the variable contents of
24 * function_trace_op as the third parameter back from the
25 * mcount call, then the arch should define this as 1.
27 #ifndef ARCH_SUPPORTS_FTRACE_OPS
28 #define ARCH_SUPPORTS_FTRACE_OPS 0
32 * If the arch's mcount caller does not support all of ftrace's
33 * features, then it must call an indirect function that
34 * does. Or at least does enough to prevent any unwelcomed side effects.
36 #if !defined(CONFIG_HAVE_FUNCTION_TRACE_MCOUNT_TEST) || \
37 !ARCH_SUPPORTS_FTRACE_OPS
38 # define FTRACE_FORCE_LIST_FUNC 1
40 # define FTRACE_FORCE_LIST_FUNC 0
47 #ifdef CONFIG_FUNCTION_TRACER
49 extern int ftrace_enabled
;
51 ftrace_enable_sysctl(struct ctl_table
*table
, int write
,
52 void __user
*buffer
, size_t *lenp
,
57 typedef void (*ftrace_func_t
)(unsigned long ip
, unsigned long parent_ip
,
58 struct ftrace_ops
*op
, struct pt_regs
*regs
);
61 * FTRACE_OPS_FL_* bits denote the state of ftrace_ops struct and are
62 * set in the flags member.
64 * ENABLED - set/unset when ftrace_ops is registered/unregistered
65 * GLOBAL - set manualy by ftrace_ops user to denote the ftrace_ops
66 * is part of the global tracers sharing the same filter
67 * via set_ftrace_* debugfs files.
68 * DYNAMIC - set when ftrace_ops is registered to denote dynamically
69 * allocated ftrace_ops which need special care
70 * CONTROL - set manualy by ftrace_ops user to denote the ftrace_ops
71 * could be controled by following calls:
72 * ftrace_function_local_enable
73 * ftrace_function_local_disable
74 * SAVE_REGS - The ftrace_ops wants regs saved at each function called
75 * and passed to the callback. If this flag is set, but the
76 * architecture does not support passing regs
77 * (CONFIG_DYNAMIC_FTRACE_WITH_REGS is not defined), then the
78 * ftrace_ops will fail to register, unless the next flag
80 * SAVE_REGS_IF_SUPPORTED - This is the same as SAVE_REGS, but if the
81 * handler can handle an arch that does not save regs
82 * (the handler tests if regs == NULL), then it can set
83 * this flag instead. It will not fail registering the ftrace_ops
84 * but, the regs field will be NULL if the arch does not support
85 * passing regs to the handler.
86 * Note, if this flag is set, the SAVE_REGS flag will automatically
87 * get set upon registering the ftrace_ops, if the arch supports it.
88 * RECURSION_SAFE - The ftrace_ops can set this to tell the ftrace infrastructure
89 * that the call back has its own recursion protection. If it does
90 * not set this, then the ftrace infrastructure will add recursion
91 * protection for the caller.
92 * STUB - The ftrace_ops is just a place holder.
95 FTRACE_OPS_FL_ENABLED
= 1 << 0,
96 FTRACE_OPS_FL_GLOBAL
= 1 << 1,
97 FTRACE_OPS_FL_DYNAMIC
= 1 << 2,
98 FTRACE_OPS_FL_CONTROL
= 1 << 3,
99 FTRACE_OPS_FL_SAVE_REGS
= 1 << 4,
100 FTRACE_OPS_FL_SAVE_REGS_IF_SUPPORTED
= 1 << 5,
101 FTRACE_OPS_FL_RECURSION_SAFE
= 1 << 6,
102 FTRACE_OPS_FL_STUB
= 1 << 7,
107 struct ftrace_ops
*next
;
109 int __percpu
*disabled
;
110 #ifdef CONFIG_DYNAMIC_FTRACE
111 struct ftrace_hash
*notrace_hash
;
112 struct ftrace_hash
*filter_hash
;
116 extern int function_trace_stop
;
119 * Type of the current tracing.
121 enum ftrace_tracing_type_t
{
122 FTRACE_TYPE_ENTER
= 0, /* Hook the call of the function */
123 FTRACE_TYPE_RETURN
, /* Hook the return of the function */
126 /* Current tracing type, default is FTRACE_TYPE_ENTER */
127 extern enum ftrace_tracing_type_t ftrace_tracing_type
;
130 * ftrace_stop - stop function tracer.
132 * A quick way to stop the function tracer. Note this an on off switch,
133 * it is not something that is recursive like preempt_disable.
134 * This does not disable the calling of mcount, it only stops the
135 * calling of functions from mcount.
137 static inline void ftrace_stop(void)
139 function_trace_stop
= 1;
143 * ftrace_start - start the function tracer.
145 * This function is the inverse of ftrace_stop. This does not enable
146 * the function tracing if the function tracer is disabled. This only
147 * sets the function tracer flag to continue calling the functions
150 static inline void ftrace_start(void)
152 function_trace_stop
= 0;
156 * The ftrace_ops must be a static and should also
157 * be read_mostly. These functions do modify read_mostly variables
158 * so use them sparely. Never free an ftrace_op or modify the
159 * next pointer after it has been registered. Even after unregistering
160 * it, the next pointer may still be used internally.
162 int register_ftrace_function(struct ftrace_ops
*ops
);
163 int unregister_ftrace_function(struct ftrace_ops
*ops
);
164 void clear_ftrace_function(void);
167 * ftrace_function_local_enable - enable controlled ftrace_ops on current cpu
169 * This function enables tracing on current cpu by decreasing
170 * the per cpu control variable.
171 * It must be called with preemption disabled and only on ftrace_ops
172 * registered with FTRACE_OPS_FL_CONTROL. If called without preemption
173 * disabled, this_cpu_ptr will complain when CONFIG_DEBUG_PREEMPT is enabled.
175 static inline void ftrace_function_local_enable(struct ftrace_ops
*ops
)
177 if (WARN_ON_ONCE(!(ops
->flags
& FTRACE_OPS_FL_CONTROL
)))
180 (*this_cpu_ptr(ops
->disabled
))--;
184 * ftrace_function_local_disable - enable controlled ftrace_ops on current cpu
186 * This function enables tracing on current cpu by decreasing
187 * the per cpu control variable.
188 * It must be called with preemption disabled and only on ftrace_ops
189 * registered with FTRACE_OPS_FL_CONTROL. If called without preemption
190 * disabled, this_cpu_ptr will complain when CONFIG_DEBUG_PREEMPT is enabled.
192 static inline void ftrace_function_local_disable(struct ftrace_ops
*ops
)
194 if (WARN_ON_ONCE(!(ops
->flags
& FTRACE_OPS_FL_CONTROL
)))
197 (*this_cpu_ptr(ops
->disabled
))++;
201 * ftrace_function_local_disabled - returns ftrace_ops disabled value
204 * This function returns value of ftrace_ops::disabled on current cpu.
205 * It must be called with preemption disabled and only on ftrace_ops
206 * registered with FTRACE_OPS_FL_CONTROL. If called without preemption
207 * disabled, this_cpu_ptr will complain when CONFIG_DEBUG_PREEMPT is enabled.
209 static inline int ftrace_function_local_disabled(struct ftrace_ops
*ops
)
211 WARN_ON_ONCE(!(ops
->flags
& FTRACE_OPS_FL_CONTROL
));
212 return *this_cpu_ptr(ops
->disabled
);
215 extern void ftrace_stub(unsigned long a0
, unsigned long a1
,
216 struct ftrace_ops
*op
, struct pt_regs
*regs
);
218 #else /* !CONFIG_FUNCTION_TRACER */
220 * (un)register_ftrace_function must be a macro since the ops parameter
221 * must not be evaluated.
223 #define register_ftrace_function(ops) ({ 0; })
224 #define unregister_ftrace_function(ops) ({ 0; })
225 static inline int ftrace_nr_registered_ops(void)
229 static inline void clear_ftrace_function(void) { }
230 static inline void ftrace_kill(void) { }
231 static inline void ftrace_stop(void) { }
232 static inline void ftrace_start(void) { }
233 #endif /* CONFIG_FUNCTION_TRACER */
235 #ifdef CONFIG_STACK_TRACER
236 extern int stack_tracer_enabled
;
238 stack_trace_sysctl(struct ctl_table
*table
, int write
,
239 void __user
*buffer
, size_t *lenp
,
243 struct ftrace_func_command
{
244 struct list_head list
;
246 int (*func
)(struct ftrace_hash
*hash
,
247 char *func
, char *cmd
,
248 char *params
, int enable
);
251 #ifdef CONFIG_DYNAMIC_FTRACE
253 int ftrace_arch_code_modify_prepare(void);
254 int ftrace_arch_code_modify_post_process(void);
256 void ftrace_bug(int err
, unsigned long ip
);
260 struct ftrace_probe_ops
{
261 void (*func
)(unsigned long ip
,
262 unsigned long parent_ip
,
264 int (*callback
)(unsigned long ip
, void **data
);
265 void (*free
)(void **data
);
266 int (*print
)(struct seq_file
*m
,
268 struct ftrace_probe_ops
*ops
,
273 register_ftrace_function_probe(char *glob
, struct ftrace_probe_ops
*ops
,
276 unregister_ftrace_function_probe(char *glob
, struct ftrace_probe_ops
*ops
,
279 unregister_ftrace_function_probe_func(char *glob
, struct ftrace_probe_ops
*ops
);
280 extern void unregister_ftrace_function_probe_all(char *glob
);
282 extern int ftrace_text_reserved(void *start
, void *end
);
284 extern int ftrace_nr_registered_ops(void);
287 * The dyn_ftrace record's flags field is split into two parts.
288 * the first part which is '0-FTRACE_REF_MAX' is a counter of
289 * the number of callbacks that have registered the function that
290 * the dyn_ftrace descriptor represents.
292 * The second part is a mask:
293 * ENABLED - the function is being traced
294 * REGS - the record wants the function to save regs
295 * REGS_EN - the function is set up to save regs.
297 * When a new ftrace_ops is registered and wants a function to save
298 * pt_regs, the rec->flag REGS is set. When the function has been
299 * set up to save regs, the REG_EN flag is set. Once a function
300 * starts saving regs it will do so until all ftrace_ops are removed
301 * from tracing that function.
304 FTRACE_FL_ENABLED
= (1UL << 29),
305 FTRACE_FL_REGS
= (1UL << 30),
306 FTRACE_FL_REGS_EN
= (1UL << 31)
309 #define FTRACE_FL_MASK (0x7UL << 29)
310 #define FTRACE_REF_MAX ((1UL << 29) - 1)
314 unsigned long ip
; /* address of mcount call-site */
315 struct dyn_ftrace
*freelist
;
318 struct dyn_arch_ftrace arch
;
321 int ftrace_force_update(void);
322 int ftrace_set_filter_ip(struct ftrace_ops
*ops
, unsigned long ip
,
323 int remove
, int reset
);
324 int ftrace_set_filter(struct ftrace_ops
*ops
, unsigned char *buf
,
326 int ftrace_set_notrace(struct ftrace_ops
*ops
, unsigned char *buf
,
328 void ftrace_set_global_filter(unsigned char *buf
, int len
, int reset
);
329 void ftrace_set_global_notrace(unsigned char *buf
, int len
, int reset
);
330 void ftrace_free_filter(struct ftrace_ops
*ops
);
332 int register_ftrace_command(struct ftrace_func_command
*cmd
);
333 int unregister_ftrace_command(struct ftrace_func_command
*cmd
);
336 FTRACE_UPDATE_CALLS
= (1 << 0),
337 FTRACE_DISABLE_CALLS
= (1 << 1),
338 FTRACE_UPDATE_TRACE_FUNC
= (1 << 2),
339 FTRACE_START_FUNC_RET
= (1 << 3),
340 FTRACE_STOP_FUNC_RET
= (1 << 4),
344 * The FTRACE_UPDATE_* enum is used to pass information back
345 * from the ftrace_update_record() and ftrace_test_record()
346 * functions. These are called by the code update routines
347 * to find out what is to be done for a given function.
349 * IGNORE - The function is already what we want it to be
350 * MAKE_CALL - Start tracing the function
351 * MODIFY_CALL - Stop saving regs for the function
352 * MODIFY_CALL_REGS - Start saving regs for the function
353 * MAKE_NOP - Stop tracing the function
356 FTRACE_UPDATE_IGNORE
,
357 FTRACE_UPDATE_MAKE_CALL
,
358 FTRACE_UPDATE_MODIFY_CALL
,
359 FTRACE_UPDATE_MODIFY_CALL_REGS
,
360 FTRACE_UPDATE_MAKE_NOP
,
364 FTRACE_ITER_FILTER
= (1 << 0),
365 FTRACE_ITER_NOTRACE
= (1 << 1),
366 FTRACE_ITER_PRINTALL
= (1 << 2),
367 FTRACE_ITER_DO_HASH
= (1 << 3),
368 FTRACE_ITER_HASH
= (1 << 4),
369 FTRACE_ITER_ENABLED
= (1 << 5),
372 void arch_ftrace_update_code(int command
);
374 struct ftrace_rec_iter
;
376 struct ftrace_rec_iter
*ftrace_rec_iter_start(void);
377 struct ftrace_rec_iter
*ftrace_rec_iter_next(struct ftrace_rec_iter
*iter
);
378 struct dyn_ftrace
*ftrace_rec_iter_record(struct ftrace_rec_iter
*iter
);
380 #define for_ftrace_rec_iter(iter) \
381 for (iter = ftrace_rec_iter_start(); \
383 iter = ftrace_rec_iter_next(iter))
386 int ftrace_update_record(struct dyn_ftrace
*rec
, int enable
);
387 int ftrace_test_record(struct dyn_ftrace
*rec
, int enable
);
388 void ftrace_run_stop_machine(int command
);
389 unsigned long ftrace_location(unsigned long ip
);
391 extern ftrace_func_t ftrace_trace_function
;
393 int ftrace_regex_open(struct ftrace_ops
*ops
, int flag
,
394 struct inode
*inode
, struct file
*file
);
395 ssize_t
ftrace_filter_write(struct file
*file
, const char __user
*ubuf
,
396 size_t cnt
, loff_t
*ppos
);
397 ssize_t
ftrace_notrace_write(struct file
*file
, const char __user
*ubuf
,
398 size_t cnt
, loff_t
*ppos
);
399 int ftrace_regex_release(struct inode
*inode
, struct file
*file
);
402 ftrace_set_early_filter(struct ftrace_ops
*ops
, char *buf
, int enable
);
404 /* defined in arch */
405 extern int ftrace_ip_converted(unsigned long ip
);
406 extern int ftrace_dyn_arch_init(void *data
);
407 extern void ftrace_replace_code(int enable
);
408 extern int ftrace_update_ftrace_func(ftrace_func_t func
);
409 extern void ftrace_caller(void);
410 extern void ftrace_regs_caller(void);
411 extern void ftrace_call(void);
412 extern void ftrace_regs_call(void);
413 extern void mcount_call(void);
415 void ftrace_modify_all_code(int command
);
418 #define FTRACE_ADDR ((unsigned long)ftrace_caller)
421 #ifndef FTRACE_REGS_ADDR
422 #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
423 # define FTRACE_REGS_ADDR ((unsigned long)ftrace_regs_caller)
425 # define FTRACE_REGS_ADDR FTRACE_ADDR
429 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
430 extern void ftrace_graph_caller(void);
431 extern int ftrace_enable_ftrace_graph_caller(void);
432 extern int ftrace_disable_ftrace_graph_caller(void);
434 static inline int ftrace_enable_ftrace_graph_caller(void) { return 0; }
435 static inline int ftrace_disable_ftrace_graph_caller(void) { return 0; }
439 * ftrace_make_nop - convert code into nop
440 * @mod: module structure if called by module load initialization
441 * @rec: the mcount call site record
442 * @addr: the address that the call site should be calling
444 * This is a very sensitive operation and great care needs
445 * to be taken by the arch. The operation should carefully
446 * read the location, check to see if what is read is indeed
447 * what we expect it to be, and then on success of the compare,
448 * it should write to the location.
450 * The code segment at @rec->ip should be a caller to @addr
454 * -EFAULT on error reading the location
455 * -EINVAL on a failed compare of the contents
456 * -EPERM on error writing to the location
457 * Any other value will be considered a failure.
459 extern int ftrace_make_nop(struct module
*mod
,
460 struct dyn_ftrace
*rec
, unsigned long addr
);
463 * ftrace_make_call - convert a nop call site into a call to addr
464 * @rec: the mcount call site record
465 * @addr: the address that the call site should call
467 * This is a very sensitive operation and great care needs
468 * to be taken by the arch. The operation should carefully
469 * read the location, check to see if what is read is indeed
470 * what we expect it to be, and then on success of the compare,
471 * it should write to the location.
473 * The code segment at @rec->ip should be a nop
477 * -EFAULT on error reading the location
478 * -EINVAL on a failed compare of the contents
479 * -EPERM on error writing to the location
480 * Any other value will be considered a failure.
482 extern int ftrace_make_call(struct dyn_ftrace
*rec
, unsigned long addr
);
484 #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
486 * ftrace_modify_call - convert from one addr to another (no nop)
487 * @rec: the mcount call site record
488 * @old_addr: the address expected to be currently called to
489 * @addr: the address to change to
491 * This is a very sensitive operation and great care needs
492 * to be taken by the arch. The operation should carefully
493 * read the location, check to see if what is read is indeed
494 * what we expect it to be, and then on success of the compare,
495 * it should write to the location.
497 * The code segment at @rec->ip should be a caller to @old_addr
501 * -EFAULT on error reading the location
502 * -EINVAL on a failed compare of the contents
503 * -EPERM on error writing to the location
504 * Any other value will be considered a failure.
506 extern int ftrace_modify_call(struct dyn_ftrace
*rec
, unsigned long old_addr
,
509 /* Should never be called */
510 static inline int ftrace_modify_call(struct dyn_ftrace
*rec
, unsigned long old_addr
,
517 /* May be defined in arch */
518 extern int ftrace_arch_read_dyn_info(char *buf
, int size
);
520 extern int skip_trace(unsigned long ip
);
522 extern void ftrace_disable_daemon(void);
523 extern void ftrace_enable_daemon(void);
524 #else /* CONFIG_DYNAMIC_FTRACE */
525 static inline int skip_trace(unsigned long ip
) { return 0; }
526 static inline int ftrace_force_update(void) { return 0; }
527 static inline void ftrace_disable_daemon(void) { }
528 static inline void ftrace_enable_daemon(void) { }
529 static inline void ftrace_release_mod(struct module
*mod
) {}
530 static inline int register_ftrace_command(struct ftrace_func_command
*cmd
)
534 static inline int unregister_ftrace_command(char *cmd_name
)
538 static inline int ftrace_text_reserved(void *start
, void *end
)
542 static inline unsigned long ftrace_location(unsigned long ip
)
548 * Again users of functions that have ftrace_ops may not
549 * have them defined when ftrace is not enabled, but these
550 * functions may still be called. Use a macro instead of inline.
552 #define ftrace_regex_open(ops, flag, inod, file) ({ -ENODEV; })
553 #define ftrace_set_early_filter(ops, buf, enable) do { } while (0)
554 #define ftrace_set_filter_ip(ops, ip, remove, reset) ({ -ENODEV; })
555 #define ftrace_set_filter(ops, buf, len, reset) ({ -ENODEV; })
556 #define ftrace_set_notrace(ops, buf, len, reset) ({ -ENODEV; })
557 #define ftrace_free_filter(ops) do { } while (0)
559 static inline ssize_t
ftrace_filter_write(struct file
*file
, const char __user
*ubuf
,
560 size_t cnt
, loff_t
*ppos
) { return -ENODEV
; }
561 static inline ssize_t
ftrace_notrace_write(struct file
*file
, const char __user
*ubuf
,
562 size_t cnt
, loff_t
*ppos
) { return -ENODEV
; }
563 static inline loff_t
ftrace_regex_lseek(struct file
*file
, loff_t offset
, int whence
)
568 ftrace_regex_release(struct inode
*inode
, struct file
*file
) { return -ENODEV
; }
569 #endif /* CONFIG_DYNAMIC_FTRACE */
571 loff_t
ftrace_filter_lseek(struct file
*file
, loff_t offset
, int whence
);
573 /* totally disable ftrace - can not re-enable after this */
574 void ftrace_kill(void);
576 static inline void tracer_disable(void)
578 #ifdef CONFIG_FUNCTION_TRACER
584 * Ftrace disable/restore without lock. Some synchronization mechanism
585 * must be used to prevent ftrace_enabled to be changed between
588 static inline int __ftrace_enabled_save(void)
590 #ifdef CONFIG_FUNCTION_TRACER
591 int saved_ftrace_enabled
= ftrace_enabled
;
593 return saved_ftrace_enabled
;
599 static inline void __ftrace_enabled_restore(int enabled
)
601 #ifdef CONFIG_FUNCTION_TRACER
602 ftrace_enabled
= enabled
;
606 #ifndef HAVE_ARCH_CALLER_ADDR
607 # ifdef CONFIG_FRAME_POINTER
608 # define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0))
609 # define CALLER_ADDR1 ((unsigned long)__builtin_return_address(1))
610 # define CALLER_ADDR2 ((unsigned long)__builtin_return_address(2))
611 # define CALLER_ADDR3 ((unsigned long)__builtin_return_address(3))
612 # define CALLER_ADDR4 ((unsigned long)__builtin_return_address(4))
613 # define CALLER_ADDR5 ((unsigned long)__builtin_return_address(5))
614 # define CALLER_ADDR6 ((unsigned long)__builtin_return_address(6))
616 # define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0))
617 # define CALLER_ADDR1 0UL
618 # define CALLER_ADDR2 0UL
619 # define CALLER_ADDR3 0UL
620 # define CALLER_ADDR4 0UL
621 # define CALLER_ADDR5 0UL
622 # define CALLER_ADDR6 0UL
624 #endif /* ifndef HAVE_ARCH_CALLER_ADDR */
626 #ifdef CONFIG_IRQSOFF_TRACER
627 extern void time_hardirqs_on(unsigned long a0
, unsigned long a1
);
628 extern void time_hardirqs_off(unsigned long a0
, unsigned long a1
);
630 static inline void time_hardirqs_on(unsigned long a0
, unsigned long a1
) { }
631 static inline void time_hardirqs_off(unsigned long a0
, unsigned long a1
) { }
634 #ifdef CONFIG_PREEMPT_TRACER
635 extern void trace_preempt_on(unsigned long a0
, unsigned long a1
);
636 extern void trace_preempt_off(unsigned long a0
, unsigned long a1
);
639 * Use defines instead of static inlines because some arches will make code out
640 * of the CALLER_ADDR, when we really want these to be a real nop.
642 # define trace_preempt_on(a0, a1) do { } while (0)
643 # define trace_preempt_off(a0, a1) do { } while (0)
646 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
647 extern void ftrace_init(void);
649 static inline void ftrace_init(void) { }
653 * Structure that defines an entry function trace.
655 struct ftrace_graph_ent
{
656 unsigned long func
; /* Current function */
661 * Structure that defines a return function trace.
663 struct ftrace_graph_ret
{
664 unsigned long func
; /* Current function */
665 unsigned long long calltime
;
666 unsigned long long rettime
;
667 /* Number of functions that overran the depth limit for current task */
668 unsigned long overrun
;
672 /* Type of the callback handlers for tracing function graph*/
673 typedef void (*trace_func_graph_ret_t
)(struct ftrace_graph_ret
*); /* return */
674 typedef int (*trace_func_graph_ent_t
)(struct ftrace_graph_ent
*); /* entry */
676 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
679 #define INIT_FTRACE_GRAPH .ret_stack = NULL,
682 * Stack of return addresses for functions
684 * Used in struct thread_info
686 struct ftrace_ret_stack
{
689 unsigned long long calltime
;
690 unsigned long long subtime
;
695 * Primary handler of a function return.
696 * It relays on ftrace_return_to_handler.
697 * Defined in entry_32/64.S
699 extern void return_to_handler(void);
702 ftrace_push_return_trace(unsigned long ret
, unsigned long func
, int *depth
,
703 unsigned long frame_pointer
);
706 * Sometimes we don't want to trace a function with the function
707 * graph tracer but we want them to keep traced by the usual function
708 * tracer if the function graph tracer is not configured.
710 #define __notrace_funcgraph notrace
713 * We want to which function is an entrypoint of a hardirq.
714 * That will help us to put a signal on output.
716 #define __irq_entry __attribute__((__section__(".irqentry.text")))
718 /* Limits of hardirq entrypoints */
719 extern char __irqentry_text_start
[];
720 extern char __irqentry_text_end
[];
722 #define FTRACE_RETFUNC_DEPTH 50
723 #define FTRACE_RETSTACK_ALLOC_SIZE 32
724 extern int register_ftrace_graph(trace_func_graph_ret_t retfunc
,
725 trace_func_graph_ent_t entryfunc
);
727 extern void ftrace_graph_stop(void);
729 /* The current handlers in use */
730 extern trace_func_graph_ret_t ftrace_graph_return
;
731 extern trace_func_graph_ent_t ftrace_graph_entry
;
733 extern void unregister_ftrace_graph(void);
735 extern void ftrace_graph_init_task(struct task_struct
*t
);
736 extern void ftrace_graph_exit_task(struct task_struct
*t
);
737 extern void ftrace_graph_init_idle_task(struct task_struct
*t
, int cpu
);
739 static inline int task_curr_ret_stack(struct task_struct
*t
)
741 return t
->curr_ret_stack
;
744 static inline void pause_graph_tracing(void)
746 atomic_inc(¤t
->tracing_graph_pause
);
749 static inline void unpause_graph_tracing(void)
751 atomic_dec(¤t
->tracing_graph_pause
);
753 #else /* !CONFIG_FUNCTION_GRAPH_TRACER */
755 #define __notrace_funcgraph
757 #define INIT_FTRACE_GRAPH
759 static inline void ftrace_graph_init_task(struct task_struct
*t
) { }
760 static inline void ftrace_graph_exit_task(struct task_struct
*t
) { }
761 static inline void ftrace_graph_init_idle_task(struct task_struct
*t
, int cpu
) { }
763 static inline int register_ftrace_graph(trace_func_graph_ret_t retfunc
,
764 trace_func_graph_ent_t entryfunc
)
768 static inline void unregister_ftrace_graph(void) { }
770 static inline int task_curr_ret_stack(struct task_struct
*tsk
)
775 static inline void pause_graph_tracing(void) { }
776 static inline void unpause_graph_tracing(void) { }
777 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
779 #ifdef CONFIG_TRACING
781 /* flags for current->trace */
783 TSK_TRACE_FL_TRACE_BIT
= 0,
784 TSK_TRACE_FL_GRAPH_BIT
= 1,
787 TSK_TRACE_FL_TRACE
= 1 << TSK_TRACE_FL_TRACE_BIT
,
788 TSK_TRACE_FL_GRAPH
= 1 << TSK_TRACE_FL_GRAPH_BIT
,
791 static inline void set_tsk_trace_trace(struct task_struct
*tsk
)
793 set_bit(TSK_TRACE_FL_TRACE_BIT
, &tsk
->trace
);
796 static inline void clear_tsk_trace_trace(struct task_struct
*tsk
)
798 clear_bit(TSK_TRACE_FL_TRACE_BIT
, &tsk
->trace
);
801 static inline int test_tsk_trace_trace(struct task_struct
*tsk
)
803 return tsk
->trace
& TSK_TRACE_FL_TRACE
;
806 static inline void set_tsk_trace_graph(struct task_struct
*tsk
)
808 set_bit(TSK_TRACE_FL_GRAPH_BIT
, &tsk
->trace
);
811 static inline void clear_tsk_trace_graph(struct task_struct
*tsk
)
813 clear_bit(TSK_TRACE_FL_GRAPH_BIT
, &tsk
->trace
);
816 static inline int test_tsk_trace_graph(struct task_struct
*tsk
)
818 return tsk
->trace
& TSK_TRACE_FL_GRAPH
;
821 enum ftrace_dump_mode
;
823 extern enum ftrace_dump_mode ftrace_dump_on_oops
;
825 #ifdef CONFIG_PREEMPT
826 #define INIT_TRACE_RECURSION .trace_recursion = 0,
829 #endif /* CONFIG_TRACING */
831 #ifndef INIT_TRACE_RECURSION
832 #define INIT_TRACE_RECURSION
835 #ifdef CONFIG_FTRACE_SYSCALLS
837 unsigned long arch_syscall_addr(int nr
);
839 #endif /* CONFIG_FTRACE_SYSCALLS */
841 #endif /* _LINUX_FTRACE_H */