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.
93 * INITIALIZED - The ftrace_ops has already been initialized (first use time
94 * register_ftrace_function() is called, it will initialized the ops)
97 FTRACE_OPS_FL_ENABLED
= 1 << 0,
98 FTRACE_OPS_FL_GLOBAL
= 1 << 1,
99 FTRACE_OPS_FL_DYNAMIC
= 1 << 2,
100 FTRACE_OPS_FL_CONTROL
= 1 << 3,
101 FTRACE_OPS_FL_SAVE_REGS
= 1 << 4,
102 FTRACE_OPS_FL_SAVE_REGS_IF_SUPPORTED
= 1 << 5,
103 FTRACE_OPS_FL_RECURSION_SAFE
= 1 << 6,
104 FTRACE_OPS_FL_STUB
= 1 << 7,
105 FTRACE_OPS_FL_INITIALIZED
= 1 << 8,
110 struct ftrace_ops
*next
;
112 int __percpu
*disabled
;
113 #ifdef CONFIG_DYNAMIC_FTRACE
114 struct ftrace_hash
*notrace_hash
;
115 struct ftrace_hash
*filter_hash
;
116 struct mutex regex_lock
;
120 extern int function_trace_stop
;
123 * Type of the current tracing.
125 enum ftrace_tracing_type_t
{
126 FTRACE_TYPE_ENTER
= 0, /* Hook the call of the function */
127 FTRACE_TYPE_RETURN
, /* Hook the return of the function */
130 /* Current tracing type, default is FTRACE_TYPE_ENTER */
131 extern enum ftrace_tracing_type_t ftrace_tracing_type
;
134 * ftrace_stop - stop function tracer.
136 * A quick way to stop the function tracer. Note this an on off switch,
137 * it is not something that is recursive like preempt_disable.
138 * This does not disable the calling of mcount, it only stops the
139 * calling of functions from mcount.
141 static inline void ftrace_stop(void)
143 function_trace_stop
= 1;
147 * ftrace_start - start the function tracer.
149 * This function is the inverse of ftrace_stop. This does not enable
150 * the function tracing if the function tracer is disabled. This only
151 * sets the function tracer flag to continue calling the functions
154 static inline void ftrace_start(void)
156 function_trace_stop
= 0;
160 * The ftrace_ops must be a static and should also
161 * be read_mostly. These functions do modify read_mostly variables
162 * so use them sparely. Never free an ftrace_op or modify the
163 * next pointer after it has been registered. Even after unregistering
164 * it, the next pointer may still be used internally.
166 int register_ftrace_function(struct ftrace_ops
*ops
);
167 int unregister_ftrace_function(struct ftrace_ops
*ops
);
168 void clear_ftrace_function(void);
171 * ftrace_function_local_enable - enable controlled ftrace_ops on current cpu
173 * This function enables tracing on current cpu by decreasing
174 * the per cpu control variable.
175 * It must be called with preemption disabled and only on ftrace_ops
176 * registered with FTRACE_OPS_FL_CONTROL. If called without preemption
177 * disabled, this_cpu_ptr will complain when CONFIG_DEBUG_PREEMPT is enabled.
179 static inline void ftrace_function_local_enable(struct ftrace_ops
*ops
)
181 if (WARN_ON_ONCE(!(ops
->flags
& FTRACE_OPS_FL_CONTROL
)))
184 (*this_cpu_ptr(ops
->disabled
))--;
188 * ftrace_function_local_disable - enable controlled ftrace_ops on current cpu
190 * This function enables tracing on current cpu by decreasing
191 * the per cpu control variable.
192 * It must be called with preemption disabled and only on ftrace_ops
193 * registered with FTRACE_OPS_FL_CONTROL. If called without preemption
194 * disabled, this_cpu_ptr will complain when CONFIG_DEBUG_PREEMPT is enabled.
196 static inline void ftrace_function_local_disable(struct ftrace_ops
*ops
)
198 if (WARN_ON_ONCE(!(ops
->flags
& FTRACE_OPS_FL_CONTROL
)))
201 (*this_cpu_ptr(ops
->disabled
))++;
205 * ftrace_function_local_disabled - returns ftrace_ops disabled value
208 * This function returns value of ftrace_ops::disabled on current cpu.
209 * It must be called with preemption disabled and only on ftrace_ops
210 * registered with FTRACE_OPS_FL_CONTROL. If called without preemption
211 * disabled, this_cpu_ptr will complain when CONFIG_DEBUG_PREEMPT is enabled.
213 static inline int ftrace_function_local_disabled(struct ftrace_ops
*ops
)
215 WARN_ON_ONCE(!(ops
->flags
& FTRACE_OPS_FL_CONTROL
));
216 return *this_cpu_ptr(ops
->disabled
);
219 extern void ftrace_stub(unsigned long a0
, unsigned long a1
,
220 struct ftrace_ops
*op
, struct pt_regs
*regs
);
222 #else /* !CONFIG_FUNCTION_TRACER */
224 * (un)register_ftrace_function must be a macro since the ops parameter
225 * must not be evaluated.
227 #define register_ftrace_function(ops) ({ 0; })
228 #define unregister_ftrace_function(ops) ({ 0; })
229 static inline int ftrace_nr_registered_ops(void)
233 static inline void clear_ftrace_function(void) { }
234 static inline void ftrace_kill(void) { }
235 static inline void ftrace_stop(void) { }
236 static inline void ftrace_start(void) { }
237 #endif /* CONFIG_FUNCTION_TRACER */
239 #ifdef CONFIG_STACK_TRACER
240 extern int stack_tracer_enabled
;
242 stack_trace_sysctl(struct ctl_table
*table
, int write
,
243 void __user
*buffer
, size_t *lenp
,
247 struct ftrace_func_command
{
248 struct list_head list
;
250 int (*func
)(struct ftrace_hash
*hash
,
251 char *func
, char *cmd
,
252 char *params
, int enable
);
255 #ifdef CONFIG_DYNAMIC_FTRACE
257 int ftrace_arch_code_modify_prepare(void);
258 int ftrace_arch_code_modify_post_process(void);
260 void ftrace_bug(int err
, unsigned long ip
);
264 struct ftrace_probe_ops
{
265 void (*func
)(unsigned long ip
,
266 unsigned long parent_ip
,
268 int (*init
)(struct ftrace_probe_ops
*ops
,
269 unsigned long ip
, void **data
);
270 void (*free
)(struct ftrace_probe_ops
*ops
,
271 unsigned long ip
, void **data
);
272 int (*print
)(struct seq_file
*m
,
274 struct ftrace_probe_ops
*ops
,
279 register_ftrace_function_probe(char *glob
, struct ftrace_probe_ops
*ops
,
282 unregister_ftrace_function_probe(char *glob
, struct ftrace_probe_ops
*ops
,
285 unregister_ftrace_function_probe_func(char *glob
, struct ftrace_probe_ops
*ops
);
286 extern void unregister_ftrace_function_probe_all(char *glob
);
288 extern int ftrace_text_reserved(void *start
, void *end
);
290 extern int ftrace_nr_registered_ops(void);
293 * The dyn_ftrace record's flags field is split into two parts.
294 * the first part which is '0-FTRACE_REF_MAX' is a counter of
295 * the number of callbacks that have registered the function that
296 * the dyn_ftrace descriptor represents.
298 * The second part is a mask:
299 * ENABLED - the function is being traced
300 * REGS - the record wants the function to save regs
301 * REGS_EN - the function is set up to save regs.
303 * When a new ftrace_ops is registered and wants a function to save
304 * pt_regs, the rec->flag REGS is set. When the function has been
305 * set up to save regs, the REG_EN flag is set. Once a function
306 * starts saving regs it will do so until all ftrace_ops are removed
307 * from tracing that function.
310 FTRACE_FL_ENABLED
= (1UL << 29),
311 FTRACE_FL_REGS
= (1UL << 30),
312 FTRACE_FL_REGS_EN
= (1UL << 31)
315 #define FTRACE_FL_MASK (0x7UL << 29)
316 #define FTRACE_REF_MAX ((1UL << 29) - 1)
320 unsigned long ip
; /* address of mcount call-site */
321 struct dyn_ftrace
*freelist
;
324 struct dyn_arch_ftrace arch
;
327 int ftrace_force_update(void);
328 int ftrace_set_filter_ip(struct ftrace_ops
*ops
, unsigned long ip
,
329 int remove
, int reset
);
330 int ftrace_set_filter(struct ftrace_ops
*ops
, unsigned char *buf
,
332 int ftrace_set_notrace(struct ftrace_ops
*ops
, unsigned char *buf
,
334 void ftrace_set_global_filter(unsigned char *buf
, int len
, int reset
);
335 void ftrace_set_global_notrace(unsigned char *buf
, int len
, int reset
);
336 void ftrace_free_filter(struct ftrace_ops
*ops
);
338 int register_ftrace_command(struct ftrace_func_command
*cmd
);
339 int unregister_ftrace_command(struct ftrace_func_command
*cmd
);
342 FTRACE_UPDATE_CALLS
= (1 << 0),
343 FTRACE_DISABLE_CALLS
= (1 << 1),
344 FTRACE_UPDATE_TRACE_FUNC
= (1 << 2),
345 FTRACE_START_FUNC_RET
= (1 << 3),
346 FTRACE_STOP_FUNC_RET
= (1 << 4),
350 * The FTRACE_UPDATE_* enum is used to pass information back
351 * from the ftrace_update_record() and ftrace_test_record()
352 * functions. These are called by the code update routines
353 * to find out what is to be done for a given function.
355 * IGNORE - The function is already what we want it to be
356 * MAKE_CALL - Start tracing the function
357 * MODIFY_CALL - Stop saving regs for the function
358 * MODIFY_CALL_REGS - Start saving regs for the function
359 * MAKE_NOP - Stop tracing the function
362 FTRACE_UPDATE_IGNORE
,
363 FTRACE_UPDATE_MAKE_CALL
,
364 FTRACE_UPDATE_MODIFY_CALL
,
365 FTRACE_UPDATE_MODIFY_CALL_REGS
,
366 FTRACE_UPDATE_MAKE_NOP
,
370 FTRACE_ITER_FILTER
= (1 << 0),
371 FTRACE_ITER_NOTRACE
= (1 << 1),
372 FTRACE_ITER_PRINTALL
= (1 << 2),
373 FTRACE_ITER_DO_HASH
= (1 << 3),
374 FTRACE_ITER_HASH
= (1 << 4),
375 FTRACE_ITER_ENABLED
= (1 << 5),
378 void arch_ftrace_update_code(int command
);
380 struct ftrace_rec_iter
;
382 struct ftrace_rec_iter
*ftrace_rec_iter_start(void);
383 struct ftrace_rec_iter
*ftrace_rec_iter_next(struct ftrace_rec_iter
*iter
);
384 struct dyn_ftrace
*ftrace_rec_iter_record(struct ftrace_rec_iter
*iter
);
386 #define for_ftrace_rec_iter(iter) \
387 for (iter = ftrace_rec_iter_start(); \
389 iter = ftrace_rec_iter_next(iter))
392 int ftrace_update_record(struct dyn_ftrace
*rec
, int enable
);
393 int ftrace_test_record(struct dyn_ftrace
*rec
, int enable
);
394 void ftrace_run_stop_machine(int command
);
395 unsigned long ftrace_location(unsigned long ip
);
397 extern ftrace_func_t ftrace_trace_function
;
399 int ftrace_regex_open(struct ftrace_ops
*ops
, int flag
,
400 struct inode
*inode
, struct file
*file
);
401 ssize_t
ftrace_filter_write(struct file
*file
, const char __user
*ubuf
,
402 size_t cnt
, loff_t
*ppos
);
403 ssize_t
ftrace_notrace_write(struct file
*file
, const char __user
*ubuf
,
404 size_t cnt
, loff_t
*ppos
);
405 int ftrace_regex_release(struct inode
*inode
, struct file
*file
);
408 ftrace_set_early_filter(struct ftrace_ops
*ops
, char *buf
, int enable
);
410 /* defined in arch */
411 extern int ftrace_ip_converted(unsigned long ip
);
412 extern int ftrace_dyn_arch_init(void *data
);
413 extern void ftrace_replace_code(int enable
);
414 extern int ftrace_update_ftrace_func(ftrace_func_t func
);
415 extern void ftrace_caller(void);
416 extern void ftrace_regs_caller(void);
417 extern void ftrace_call(void);
418 extern void ftrace_regs_call(void);
419 extern void mcount_call(void);
421 void ftrace_modify_all_code(int command
);
424 #define FTRACE_ADDR ((unsigned long)ftrace_caller)
427 #ifndef FTRACE_REGS_ADDR
428 #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
429 # define FTRACE_REGS_ADDR ((unsigned long)ftrace_regs_caller)
431 # define FTRACE_REGS_ADDR FTRACE_ADDR
435 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
436 extern void ftrace_graph_caller(void);
437 extern int ftrace_enable_ftrace_graph_caller(void);
438 extern int ftrace_disable_ftrace_graph_caller(void);
440 static inline int ftrace_enable_ftrace_graph_caller(void) { return 0; }
441 static inline int ftrace_disable_ftrace_graph_caller(void) { return 0; }
445 * ftrace_make_nop - convert code into nop
446 * @mod: module structure if called by module load initialization
447 * @rec: the mcount call site record
448 * @addr: the address that the call site should be calling
450 * This is a very sensitive operation and great care needs
451 * to be taken by the arch. The operation should carefully
452 * read the location, check to see if what is read is indeed
453 * what we expect it to be, and then on success of the compare,
454 * it should write to the location.
456 * The code segment at @rec->ip should be a caller to @addr
460 * -EFAULT on error reading the location
461 * -EINVAL on a failed compare of the contents
462 * -EPERM on error writing to the location
463 * Any other value will be considered a failure.
465 extern int ftrace_make_nop(struct module
*mod
,
466 struct dyn_ftrace
*rec
, unsigned long addr
);
469 * ftrace_make_call - convert a nop call site into a call to addr
470 * @rec: the mcount call site record
471 * @addr: the address that the call site should call
473 * This is a very sensitive operation and great care needs
474 * to be taken by the arch. The operation should carefully
475 * read the location, check to see if what is read is indeed
476 * what we expect it to be, and then on success of the compare,
477 * it should write to the location.
479 * The code segment at @rec->ip should be a nop
483 * -EFAULT on error reading the location
484 * -EINVAL on a failed compare of the contents
485 * -EPERM on error writing to the location
486 * Any other value will be considered a failure.
488 extern int ftrace_make_call(struct dyn_ftrace
*rec
, unsigned long addr
);
490 #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
492 * ftrace_modify_call - convert from one addr to another (no nop)
493 * @rec: the mcount call site record
494 * @old_addr: the address expected to be currently called to
495 * @addr: the address to change to
497 * This is a very sensitive operation and great care needs
498 * to be taken by the arch. The operation should carefully
499 * read the location, check to see if what is read is indeed
500 * what we expect it to be, and then on success of the compare,
501 * it should write to the location.
503 * The code segment at @rec->ip should be a caller to @old_addr
507 * -EFAULT on error reading the location
508 * -EINVAL on a failed compare of the contents
509 * -EPERM on error writing to the location
510 * Any other value will be considered a failure.
512 extern int ftrace_modify_call(struct dyn_ftrace
*rec
, unsigned long old_addr
,
515 /* Should never be called */
516 static inline int ftrace_modify_call(struct dyn_ftrace
*rec
, unsigned long old_addr
,
523 /* May be defined in arch */
524 extern int ftrace_arch_read_dyn_info(char *buf
, int size
);
526 extern int skip_trace(unsigned long ip
);
528 extern void ftrace_disable_daemon(void);
529 extern void ftrace_enable_daemon(void);
530 #else /* CONFIG_DYNAMIC_FTRACE */
531 static inline int skip_trace(unsigned long ip
) { return 0; }
532 static inline int ftrace_force_update(void) { return 0; }
533 static inline void ftrace_disable_daemon(void) { }
534 static inline void ftrace_enable_daemon(void) { }
535 static inline void ftrace_release_mod(struct module
*mod
) {}
536 static inline int register_ftrace_command(struct ftrace_func_command
*cmd
)
540 static inline int unregister_ftrace_command(char *cmd_name
)
544 static inline int ftrace_text_reserved(void *start
, void *end
)
548 static inline unsigned long ftrace_location(unsigned long ip
)
554 * Again users of functions that have ftrace_ops may not
555 * have them defined when ftrace is not enabled, but these
556 * functions may still be called. Use a macro instead of inline.
558 #define ftrace_regex_open(ops, flag, inod, file) ({ -ENODEV; })
559 #define ftrace_set_early_filter(ops, buf, enable) do { } while (0)
560 #define ftrace_set_filter_ip(ops, ip, remove, reset) ({ -ENODEV; })
561 #define ftrace_set_filter(ops, buf, len, reset) ({ -ENODEV; })
562 #define ftrace_set_notrace(ops, buf, len, reset) ({ -ENODEV; })
563 #define ftrace_free_filter(ops) do { } while (0)
565 static inline ssize_t
ftrace_filter_write(struct file
*file
, const char __user
*ubuf
,
566 size_t cnt
, loff_t
*ppos
) { return -ENODEV
; }
567 static inline ssize_t
ftrace_notrace_write(struct file
*file
, const char __user
*ubuf
,
568 size_t cnt
, loff_t
*ppos
) { return -ENODEV
; }
569 static inline loff_t
ftrace_regex_lseek(struct file
*file
, loff_t offset
, int whence
)
574 ftrace_regex_release(struct inode
*inode
, struct file
*file
) { return -ENODEV
; }
575 #endif /* CONFIG_DYNAMIC_FTRACE */
577 loff_t
ftrace_filter_lseek(struct file
*file
, loff_t offset
, int whence
);
579 /* totally disable ftrace - can not re-enable after this */
580 void ftrace_kill(void);
582 static inline void tracer_disable(void)
584 #ifdef CONFIG_FUNCTION_TRACER
590 * Ftrace disable/restore without lock. Some synchronization mechanism
591 * must be used to prevent ftrace_enabled to be changed between
594 static inline int __ftrace_enabled_save(void)
596 #ifdef CONFIG_FUNCTION_TRACER
597 int saved_ftrace_enabled
= ftrace_enabled
;
599 return saved_ftrace_enabled
;
605 static inline void __ftrace_enabled_restore(int enabled
)
607 #ifdef CONFIG_FUNCTION_TRACER
608 ftrace_enabled
= enabled
;
612 #ifndef HAVE_ARCH_CALLER_ADDR
613 # ifdef CONFIG_FRAME_POINTER
614 # define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0))
615 # define CALLER_ADDR1 ((unsigned long)__builtin_return_address(1))
616 # define CALLER_ADDR2 ((unsigned long)__builtin_return_address(2))
617 # define CALLER_ADDR3 ((unsigned long)__builtin_return_address(3))
618 # define CALLER_ADDR4 ((unsigned long)__builtin_return_address(4))
619 # define CALLER_ADDR5 ((unsigned long)__builtin_return_address(5))
620 # define CALLER_ADDR6 ((unsigned long)__builtin_return_address(6))
622 # define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0))
623 # define CALLER_ADDR1 0UL
624 # define CALLER_ADDR2 0UL
625 # define CALLER_ADDR3 0UL
626 # define CALLER_ADDR4 0UL
627 # define CALLER_ADDR5 0UL
628 # define CALLER_ADDR6 0UL
630 #endif /* ifndef HAVE_ARCH_CALLER_ADDR */
632 #ifdef CONFIG_IRQSOFF_TRACER
633 extern void time_hardirqs_on(unsigned long a0
, unsigned long a1
);
634 extern void time_hardirqs_off(unsigned long a0
, unsigned long a1
);
636 static inline void time_hardirqs_on(unsigned long a0
, unsigned long a1
) { }
637 static inline void time_hardirqs_off(unsigned long a0
, unsigned long a1
) { }
640 #ifdef CONFIG_PREEMPT_TRACER
641 extern void trace_preempt_on(unsigned long a0
, unsigned long a1
);
642 extern void trace_preempt_off(unsigned long a0
, unsigned long a1
);
645 * Use defines instead of static inlines because some arches will make code out
646 * of the CALLER_ADDR, when we really want these to be a real nop.
648 # define trace_preempt_on(a0, a1) do { } while (0)
649 # define trace_preempt_off(a0, a1) do { } while (0)
652 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
653 extern void ftrace_init(void);
655 static inline void ftrace_init(void) { }
659 * Structure that defines an entry function trace.
661 struct ftrace_graph_ent
{
662 unsigned long func
; /* Current function */
667 * Structure that defines a return function trace.
669 struct ftrace_graph_ret
{
670 unsigned long func
; /* Current function */
671 unsigned long long calltime
;
672 unsigned long long rettime
;
673 /* Number of functions that overran the depth limit for current task */
674 unsigned long overrun
;
678 /* Type of the callback handlers for tracing function graph*/
679 typedef void (*trace_func_graph_ret_t
)(struct ftrace_graph_ret
*); /* return */
680 typedef int (*trace_func_graph_ent_t
)(struct ftrace_graph_ent
*); /* entry */
682 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
685 #define INIT_FTRACE_GRAPH .ret_stack = NULL,
688 * Stack of return addresses for functions
690 * Used in struct thread_info
692 struct ftrace_ret_stack
{
695 unsigned long long calltime
;
696 unsigned long long subtime
;
701 * Primary handler of a function return.
702 * It relays on ftrace_return_to_handler.
703 * Defined in entry_32/64.S
705 extern void return_to_handler(void);
708 ftrace_push_return_trace(unsigned long ret
, unsigned long func
, int *depth
,
709 unsigned long frame_pointer
);
712 * Sometimes we don't want to trace a function with the function
713 * graph tracer but we want them to keep traced by the usual function
714 * tracer if the function graph tracer is not configured.
716 #define __notrace_funcgraph notrace
719 * We want to which function is an entrypoint of a hardirq.
720 * That will help us to put a signal on output.
722 #define __irq_entry __attribute__((__section__(".irqentry.text")))
724 /* Limits of hardirq entrypoints */
725 extern char __irqentry_text_start
[];
726 extern char __irqentry_text_end
[];
728 #define FTRACE_RETFUNC_DEPTH 50
729 #define FTRACE_RETSTACK_ALLOC_SIZE 32
730 extern int register_ftrace_graph(trace_func_graph_ret_t retfunc
,
731 trace_func_graph_ent_t entryfunc
);
733 extern void ftrace_graph_stop(void);
735 /* The current handlers in use */
736 extern trace_func_graph_ret_t ftrace_graph_return
;
737 extern trace_func_graph_ent_t ftrace_graph_entry
;
739 extern void unregister_ftrace_graph(void);
741 extern void ftrace_graph_init_task(struct task_struct
*t
);
742 extern void ftrace_graph_exit_task(struct task_struct
*t
);
743 extern void ftrace_graph_init_idle_task(struct task_struct
*t
, int cpu
);
745 static inline int task_curr_ret_stack(struct task_struct
*t
)
747 return t
->curr_ret_stack
;
750 static inline void pause_graph_tracing(void)
752 atomic_inc(¤t
->tracing_graph_pause
);
755 static inline void unpause_graph_tracing(void)
757 atomic_dec(¤t
->tracing_graph_pause
);
759 #else /* !CONFIG_FUNCTION_GRAPH_TRACER */
761 #define __notrace_funcgraph
763 #define INIT_FTRACE_GRAPH
765 static inline void ftrace_graph_init_task(struct task_struct
*t
) { }
766 static inline void ftrace_graph_exit_task(struct task_struct
*t
) { }
767 static inline void ftrace_graph_init_idle_task(struct task_struct
*t
, int cpu
) { }
769 static inline int register_ftrace_graph(trace_func_graph_ret_t retfunc
,
770 trace_func_graph_ent_t entryfunc
)
774 static inline void unregister_ftrace_graph(void) { }
776 static inline int task_curr_ret_stack(struct task_struct
*tsk
)
781 static inline void pause_graph_tracing(void) { }
782 static inline void unpause_graph_tracing(void) { }
783 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
785 #ifdef CONFIG_TRACING
787 /* flags for current->trace */
789 TSK_TRACE_FL_TRACE_BIT
= 0,
790 TSK_TRACE_FL_GRAPH_BIT
= 1,
793 TSK_TRACE_FL_TRACE
= 1 << TSK_TRACE_FL_TRACE_BIT
,
794 TSK_TRACE_FL_GRAPH
= 1 << TSK_TRACE_FL_GRAPH_BIT
,
797 static inline void set_tsk_trace_trace(struct task_struct
*tsk
)
799 set_bit(TSK_TRACE_FL_TRACE_BIT
, &tsk
->trace
);
802 static inline void clear_tsk_trace_trace(struct task_struct
*tsk
)
804 clear_bit(TSK_TRACE_FL_TRACE_BIT
, &tsk
->trace
);
807 static inline int test_tsk_trace_trace(struct task_struct
*tsk
)
809 return tsk
->trace
& TSK_TRACE_FL_TRACE
;
812 static inline void set_tsk_trace_graph(struct task_struct
*tsk
)
814 set_bit(TSK_TRACE_FL_GRAPH_BIT
, &tsk
->trace
);
817 static inline void clear_tsk_trace_graph(struct task_struct
*tsk
)
819 clear_bit(TSK_TRACE_FL_GRAPH_BIT
, &tsk
->trace
);
822 static inline int test_tsk_trace_graph(struct task_struct
*tsk
)
824 return tsk
->trace
& TSK_TRACE_FL_GRAPH
;
827 enum ftrace_dump_mode
;
829 extern enum ftrace_dump_mode ftrace_dump_on_oops
;
831 #ifdef CONFIG_PREEMPT
832 #define INIT_TRACE_RECURSION .trace_recursion = 0,
835 #endif /* CONFIG_TRACING */
837 #ifndef INIT_TRACE_RECURSION
838 #define INIT_TRACE_RECURSION
841 #ifdef CONFIG_FTRACE_SYSCALLS
843 unsigned long arch_syscall_addr(int nr
);
845 #endif /* CONFIG_FTRACE_SYSCALLS */
847 #endif /* _LINUX_FTRACE_H */