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 !ARCH_SUPPORTS_FTRACE_OPS
37 # define FTRACE_FORCE_LIST_FUNC 1
39 # define FTRACE_FORCE_LIST_FUNC 0
42 /* Main tracing buffer and events set up */
44 void trace_init(void);
46 static inline void trace_init(void) { }
52 #ifdef CONFIG_FUNCTION_TRACER
54 extern int ftrace_enabled
;
56 ftrace_enable_sysctl(struct ctl_table
*table
, int write
,
57 void __user
*buffer
, size_t *lenp
,
62 typedef void (*ftrace_func_t
)(unsigned long ip
, unsigned long parent_ip
,
63 struct ftrace_ops
*op
, struct pt_regs
*regs
);
65 ftrace_func_t
ftrace_ops_get_func(struct ftrace_ops
*ops
);
68 * FTRACE_OPS_FL_* bits denote the state of ftrace_ops struct and are
69 * set in the flags member.
70 * CONTROL, SAVE_REGS, SAVE_REGS_IF_SUPPORTED, RECURSION_SAFE, STUB and
71 * IPMODIFY are a kind of attribute flags which can be set only before
72 * registering the ftrace_ops, and can not be modified while registered.
73 * Changing those attribute flags after regsitering ftrace_ops will
74 * cause unexpected results.
76 * ENABLED - set/unset when ftrace_ops is registered/unregistered
77 * DYNAMIC - set when ftrace_ops is registered to denote dynamically
78 * allocated ftrace_ops which need special care
79 * CONTROL - set manualy by ftrace_ops user to denote the ftrace_ops
80 * could be controled by following calls:
81 * ftrace_function_local_enable
82 * ftrace_function_local_disable
83 * SAVE_REGS - The ftrace_ops wants regs saved at each function called
84 * and passed to the callback. If this flag is set, but the
85 * architecture does not support passing regs
86 * (CONFIG_DYNAMIC_FTRACE_WITH_REGS is not defined), then the
87 * ftrace_ops will fail to register, unless the next flag
89 * SAVE_REGS_IF_SUPPORTED - This is the same as SAVE_REGS, but if the
90 * handler can handle an arch that does not save regs
91 * (the handler tests if regs == NULL), then it can set
92 * this flag instead. It will not fail registering the ftrace_ops
93 * but, the regs field will be NULL if the arch does not support
94 * passing regs to the handler.
95 * Note, if this flag is set, the SAVE_REGS flag will automatically
96 * get set upon registering the ftrace_ops, if the arch supports it.
97 * RECURSION_SAFE - The ftrace_ops can set this to tell the ftrace infrastructure
98 * that the call back has its own recursion protection. If it does
99 * not set this, then the ftrace infrastructure will add recursion
100 * protection for the caller.
101 * STUB - The ftrace_ops is just a place holder.
102 * INITIALIZED - The ftrace_ops has already been initialized (first use time
103 * register_ftrace_function() is called, it will initialized the ops)
104 * DELETED - The ops are being deleted, do not let them be registered again.
105 * ADDING - The ops is in the process of being added.
106 * REMOVING - The ops is in the process of being removed.
107 * MODIFYING - The ops is in the process of changing its filter functions.
108 * ALLOC_TRAMP - A dynamic trampoline was allocated by the core code.
109 * The arch specific code sets this flag when it allocated a
110 * trampoline. This lets the arch know that it can update the
111 * trampoline in case the callback function changes.
112 * The ftrace_ops trampoline can be set by the ftrace users, and
113 * in such cases the arch must not modify it. Only the arch ftrace
114 * core code should set this flag.
115 * IPMODIFY - The ops can modify the IP register. This can only be set with
116 * SAVE_REGS. If another ops with this flag set is already registered
117 * for any of the functions that this ops will be registered for, then
118 * this ops will fail to register or set_filter_ip.
121 FTRACE_OPS_FL_ENABLED
= 1 << 0,
122 FTRACE_OPS_FL_DYNAMIC
= 1 << 1,
123 FTRACE_OPS_FL_CONTROL
= 1 << 2,
124 FTRACE_OPS_FL_SAVE_REGS
= 1 << 3,
125 FTRACE_OPS_FL_SAVE_REGS_IF_SUPPORTED
= 1 << 4,
126 FTRACE_OPS_FL_RECURSION_SAFE
= 1 << 5,
127 FTRACE_OPS_FL_STUB
= 1 << 6,
128 FTRACE_OPS_FL_INITIALIZED
= 1 << 7,
129 FTRACE_OPS_FL_DELETED
= 1 << 8,
130 FTRACE_OPS_FL_ADDING
= 1 << 9,
131 FTRACE_OPS_FL_REMOVING
= 1 << 10,
132 FTRACE_OPS_FL_MODIFYING
= 1 << 11,
133 FTRACE_OPS_FL_ALLOC_TRAMP
= 1 << 12,
134 FTRACE_OPS_FL_IPMODIFY
= 1 << 13,
137 #ifdef CONFIG_DYNAMIC_FTRACE
138 /* The hash used to know what functions callbacks trace */
139 struct ftrace_ops_hash
{
140 struct ftrace_hash
*notrace_hash
;
141 struct ftrace_hash
*filter_hash
;
142 struct mutex regex_lock
;
147 * Note, ftrace_ops can be referenced outside of RCU protection.
148 * (Although, for perf, the control ops prevent that). If ftrace_ops is
149 * allocated and not part of kernel core data, the unregistering of it will
150 * perform a scheduling on all CPUs to make sure that there are no more users.
151 * Depending on the load of the system that may take a bit of time.
153 * Any private data added must also take care not to be freed and if private
154 * data is added to a ftrace_ops that is in core code, the user of the
155 * ftrace_ops must perform a schedule_on_each_cpu() before freeing it.
159 struct ftrace_ops
*next
;
162 int __percpu
*disabled
;
163 #ifdef CONFIG_DYNAMIC_FTRACE
165 struct ftrace_ops_hash local_hash
;
166 struct ftrace_ops_hash
*func_hash
;
167 struct ftrace_ops_hash old_hash
;
168 unsigned long trampoline
;
169 unsigned long trampoline_size
;
174 * Type of the current tracing.
176 enum ftrace_tracing_type_t
{
177 FTRACE_TYPE_ENTER
= 0, /* Hook the call of the function */
178 FTRACE_TYPE_RETURN
, /* Hook the return of the function */
181 /* Current tracing type, default is FTRACE_TYPE_ENTER */
182 extern enum ftrace_tracing_type_t ftrace_tracing_type
;
185 * The ftrace_ops must be a static and should also
186 * be read_mostly. These functions do modify read_mostly variables
187 * so use them sparely. Never free an ftrace_op or modify the
188 * next pointer after it has been registered. Even after unregistering
189 * it, the next pointer may still be used internally.
191 int register_ftrace_function(struct ftrace_ops
*ops
);
192 int unregister_ftrace_function(struct ftrace_ops
*ops
);
193 void clear_ftrace_function(void);
196 * ftrace_function_local_enable - enable controlled ftrace_ops on current cpu
198 * This function enables tracing on current cpu by decreasing
199 * the per cpu control variable.
200 * It must be called with preemption disabled and only on ftrace_ops
201 * registered with FTRACE_OPS_FL_CONTROL. If called without preemption
202 * disabled, this_cpu_ptr will complain when CONFIG_DEBUG_PREEMPT is enabled.
204 static inline void ftrace_function_local_enable(struct ftrace_ops
*ops
)
206 if (WARN_ON_ONCE(!(ops
->flags
& FTRACE_OPS_FL_CONTROL
)))
209 (*this_cpu_ptr(ops
->disabled
))--;
213 * ftrace_function_local_disable - enable controlled ftrace_ops on current cpu
215 * This function enables tracing on current cpu by decreasing
216 * the per cpu control variable.
217 * It must be called with preemption disabled and only on ftrace_ops
218 * registered with FTRACE_OPS_FL_CONTROL. If called without preemption
219 * disabled, this_cpu_ptr will complain when CONFIG_DEBUG_PREEMPT is enabled.
221 static inline void ftrace_function_local_disable(struct ftrace_ops
*ops
)
223 if (WARN_ON_ONCE(!(ops
->flags
& FTRACE_OPS_FL_CONTROL
)))
226 (*this_cpu_ptr(ops
->disabled
))++;
230 * ftrace_function_local_disabled - returns ftrace_ops disabled value
233 * This function returns value of ftrace_ops::disabled on current cpu.
234 * It must be called with preemption disabled and only on ftrace_ops
235 * registered with FTRACE_OPS_FL_CONTROL. If called without preemption
236 * disabled, this_cpu_ptr will complain when CONFIG_DEBUG_PREEMPT is enabled.
238 static inline int ftrace_function_local_disabled(struct ftrace_ops
*ops
)
240 WARN_ON_ONCE(!(ops
->flags
& FTRACE_OPS_FL_CONTROL
));
241 return *this_cpu_ptr(ops
->disabled
);
244 extern void ftrace_stub(unsigned long a0
, unsigned long a1
,
245 struct ftrace_ops
*op
, struct pt_regs
*regs
);
247 #else /* !CONFIG_FUNCTION_TRACER */
249 * (un)register_ftrace_function must be a macro since the ops parameter
250 * must not be evaluated.
252 #define register_ftrace_function(ops) ({ 0; })
253 #define unregister_ftrace_function(ops) ({ 0; })
254 static inline int ftrace_nr_registered_ops(void)
258 static inline void clear_ftrace_function(void) { }
259 static inline void ftrace_kill(void) { }
260 #endif /* CONFIG_FUNCTION_TRACER */
262 #ifdef CONFIG_STACK_TRACER
263 extern int stack_tracer_enabled
;
265 stack_trace_sysctl(struct ctl_table
*table
, int write
,
266 void __user
*buffer
, size_t *lenp
,
270 struct ftrace_func_command
{
271 struct list_head list
;
273 int (*func
)(struct ftrace_hash
*hash
,
274 char *func
, char *cmd
,
275 char *params
, int enable
);
278 #ifdef CONFIG_DYNAMIC_FTRACE
280 int ftrace_arch_code_modify_prepare(void);
281 int ftrace_arch_code_modify_post_process(void);
285 void ftrace_bug(int err
, struct dyn_ftrace
*rec
);
289 struct ftrace_probe_ops
{
290 void (*func
)(unsigned long ip
,
291 unsigned long parent_ip
,
293 int (*init
)(struct ftrace_probe_ops
*ops
,
294 unsigned long ip
, void **data
);
295 void (*free
)(struct ftrace_probe_ops
*ops
,
296 unsigned long ip
, void **data
);
297 int (*print
)(struct seq_file
*m
,
299 struct ftrace_probe_ops
*ops
,
304 register_ftrace_function_probe(char *glob
, struct ftrace_probe_ops
*ops
,
307 unregister_ftrace_function_probe(char *glob
, struct ftrace_probe_ops
*ops
,
310 unregister_ftrace_function_probe_func(char *glob
, struct ftrace_probe_ops
*ops
);
311 extern void unregister_ftrace_function_probe_all(char *glob
);
313 extern int ftrace_text_reserved(const void *start
, const void *end
);
315 extern int ftrace_nr_registered_ops(void);
317 bool is_ftrace_trampoline(unsigned long addr
);
320 * The dyn_ftrace record's flags field is split into two parts.
321 * the first part which is '0-FTRACE_REF_MAX' is a counter of
322 * the number of callbacks that have registered the function that
323 * the dyn_ftrace descriptor represents.
325 * The second part is a mask:
326 * ENABLED - the function is being traced
327 * REGS - the record wants the function to save regs
328 * REGS_EN - the function is set up to save regs.
329 * IPMODIFY - the record allows for the IP address to be changed.
331 * When a new ftrace_ops is registered and wants a function to save
332 * pt_regs, the rec->flag REGS is set. When the function has been
333 * set up to save regs, the REG_EN flag is set. Once a function
334 * starts saving regs it will do so until all ftrace_ops are removed
335 * from tracing that function.
338 FTRACE_FL_ENABLED
= (1UL << 31),
339 FTRACE_FL_REGS
= (1UL << 30),
340 FTRACE_FL_REGS_EN
= (1UL << 29),
341 FTRACE_FL_TRAMP
= (1UL << 28),
342 FTRACE_FL_TRAMP_EN
= (1UL << 27),
343 FTRACE_FL_IPMODIFY
= (1UL << 26),
346 #define FTRACE_REF_MAX_SHIFT 26
347 #define FTRACE_FL_BITS 6
348 #define FTRACE_FL_MASKED_BITS ((1UL << FTRACE_FL_BITS) - 1)
349 #define FTRACE_FL_MASK (FTRACE_FL_MASKED_BITS << FTRACE_REF_MAX_SHIFT)
350 #define FTRACE_REF_MAX ((1UL << FTRACE_REF_MAX_SHIFT) - 1)
352 #define ftrace_rec_count(rec) ((rec)->flags & ~FTRACE_FL_MASK)
355 unsigned long ip
; /* address of mcount call-site */
357 struct dyn_arch_ftrace arch
;
360 int ftrace_force_update(void);
361 int ftrace_set_filter_ip(struct ftrace_ops
*ops
, unsigned long ip
,
362 int remove
, int reset
);
363 int ftrace_set_filter(struct ftrace_ops
*ops
, unsigned char *buf
,
365 int ftrace_set_notrace(struct ftrace_ops
*ops
, unsigned char *buf
,
367 void ftrace_set_global_filter(unsigned char *buf
, int len
, int reset
);
368 void ftrace_set_global_notrace(unsigned char *buf
, int len
, int reset
);
369 void ftrace_free_filter(struct ftrace_ops
*ops
);
371 int register_ftrace_command(struct ftrace_func_command
*cmd
);
372 int unregister_ftrace_command(struct ftrace_func_command
*cmd
);
375 FTRACE_UPDATE_CALLS
= (1 << 0),
376 FTRACE_DISABLE_CALLS
= (1 << 1),
377 FTRACE_UPDATE_TRACE_FUNC
= (1 << 2),
378 FTRACE_START_FUNC_RET
= (1 << 3),
379 FTRACE_STOP_FUNC_RET
= (1 << 4),
383 * The FTRACE_UPDATE_* enum is used to pass information back
384 * from the ftrace_update_record() and ftrace_test_record()
385 * functions. These are called by the code update routines
386 * to find out what is to be done for a given function.
388 * IGNORE - The function is already what we want it to be
389 * MAKE_CALL - Start tracing the function
390 * MODIFY_CALL - Stop saving regs for the function
391 * MAKE_NOP - Stop tracing the function
394 FTRACE_UPDATE_IGNORE
,
395 FTRACE_UPDATE_MAKE_CALL
,
396 FTRACE_UPDATE_MODIFY_CALL
,
397 FTRACE_UPDATE_MAKE_NOP
,
401 FTRACE_ITER_FILTER
= (1 << 0),
402 FTRACE_ITER_NOTRACE
= (1 << 1),
403 FTRACE_ITER_PRINTALL
= (1 << 2),
404 FTRACE_ITER_DO_HASH
= (1 << 3),
405 FTRACE_ITER_HASH
= (1 << 4),
406 FTRACE_ITER_ENABLED
= (1 << 5),
409 void arch_ftrace_update_code(int command
);
411 struct ftrace_rec_iter
;
413 struct ftrace_rec_iter
*ftrace_rec_iter_start(void);
414 struct ftrace_rec_iter
*ftrace_rec_iter_next(struct ftrace_rec_iter
*iter
);
415 struct dyn_ftrace
*ftrace_rec_iter_record(struct ftrace_rec_iter
*iter
);
417 #define for_ftrace_rec_iter(iter) \
418 for (iter = ftrace_rec_iter_start(); \
420 iter = ftrace_rec_iter_next(iter))
423 int ftrace_update_record(struct dyn_ftrace
*rec
, int enable
);
424 int ftrace_test_record(struct dyn_ftrace
*rec
, int enable
);
425 void ftrace_run_stop_machine(int command
);
426 unsigned long ftrace_location(unsigned long ip
);
427 unsigned long ftrace_get_addr_new(struct dyn_ftrace
*rec
);
428 unsigned long ftrace_get_addr_curr(struct dyn_ftrace
*rec
);
430 extern ftrace_func_t ftrace_trace_function
;
432 int ftrace_regex_open(struct ftrace_ops
*ops
, int flag
,
433 struct inode
*inode
, struct file
*file
);
434 ssize_t
ftrace_filter_write(struct file
*file
, const char __user
*ubuf
,
435 size_t cnt
, loff_t
*ppos
);
436 ssize_t
ftrace_notrace_write(struct file
*file
, const char __user
*ubuf
,
437 size_t cnt
, loff_t
*ppos
);
438 int ftrace_regex_release(struct inode
*inode
, struct file
*file
);
441 ftrace_set_early_filter(struct ftrace_ops
*ops
, char *buf
, int enable
);
443 /* defined in arch */
444 extern int ftrace_ip_converted(unsigned long ip
);
445 extern int ftrace_dyn_arch_init(void);
446 extern void ftrace_replace_code(int enable
);
447 extern int ftrace_update_ftrace_func(ftrace_func_t func
);
448 extern void ftrace_caller(void);
449 extern void ftrace_regs_caller(void);
450 extern void ftrace_call(void);
451 extern void ftrace_regs_call(void);
452 extern void mcount_call(void);
454 void ftrace_modify_all_code(int command
);
457 #define FTRACE_ADDR ((unsigned long)ftrace_caller)
460 #ifndef FTRACE_GRAPH_ADDR
461 #define FTRACE_GRAPH_ADDR ((unsigned long)ftrace_graph_caller)
464 #ifndef FTRACE_REGS_ADDR
465 #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
466 # define FTRACE_REGS_ADDR ((unsigned long)ftrace_regs_caller)
468 # define FTRACE_REGS_ADDR FTRACE_ADDR
473 * If an arch would like functions that are only traced
474 * by the function graph tracer to jump directly to its own
475 * trampoline, then they can define FTRACE_GRAPH_TRAMP_ADDR
476 * to be that address to jump to.
478 #ifndef FTRACE_GRAPH_TRAMP_ADDR
479 #define FTRACE_GRAPH_TRAMP_ADDR ((unsigned long) 0)
482 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
483 extern void ftrace_graph_caller(void);
484 extern int ftrace_enable_ftrace_graph_caller(void);
485 extern int ftrace_disable_ftrace_graph_caller(void);
487 static inline int ftrace_enable_ftrace_graph_caller(void) { return 0; }
488 static inline int ftrace_disable_ftrace_graph_caller(void) { return 0; }
492 * ftrace_make_nop - convert code into nop
493 * @mod: module structure if called by module load initialization
494 * @rec: the mcount call site record
495 * @addr: the address that the call site should be calling
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 @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_make_nop(struct module
*mod
,
513 struct dyn_ftrace
*rec
, unsigned long addr
);
516 * ftrace_make_call - convert a nop call site into a call to addr
517 * @rec: the mcount call site record
518 * @addr: the address that the call site should call
520 * This is a very sensitive operation and great care needs
521 * to be taken by the arch. The operation should carefully
522 * read the location, check to see if what is read is indeed
523 * what we expect it to be, and then on success of the compare,
524 * it should write to the location.
526 * The code segment at @rec->ip should be a nop
530 * -EFAULT on error reading the location
531 * -EINVAL on a failed compare of the contents
532 * -EPERM on error writing to the location
533 * Any other value will be considered a failure.
535 extern int ftrace_make_call(struct dyn_ftrace
*rec
, unsigned long addr
);
537 #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
539 * ftrace_modify_call - convert from one addr to another (no nop)
540 * @rec: the mcount call site record
541 * @old_addr: the address expected to be currently called to
542 * @addr: the address to change to
544 * This is a very sensitive operation and great care needs
545 * to be taken by the arch. The operation should carefully
546 * read the location, check to see if what is read is indeed
547 * what we expect it to be, and then on success of the compare,
548 * it should write to the location.
550 * The code segment at @rec->ip should be a caller to @old_addr
554 * -EFAULT on error reading the location
555 * -EINVAL on a failed compare of the contents
556 * -EPERM on error writing to the location
557 * Any other value will be considered a failure.
559 extern int ftrace_modify_call(struct dyn_ftrace
*rec
, unsigned long old_addr
,
562 /* Should never be called */
563 static inline int ftrace_modify_call(struct dyn_ftrace
*rec
, unsigned long old_addr
,
570 /* May be defined in arch */
571 extern int ftrace_arch_read_dyn_info(char *buf
, int size
);
573 extern int skip_trace(unsigned long ip
);
574 extern void ftrace_module_init(struct module
*mod
);
576 extern void ftrace_disable_daemon(void);
577 extern void ftrace_enable_daemon(void);
578 #else /* CONFIG_DYNAMIC_FTRACE */
579 static inline int skip_trace(unsigned long ip
) { return 0; }
580 static inline int ftrace_force_update(void) { return 0; }
581 static inline void ftrace_disable_daemon(void) { }
582 static inline void ftrace_enable_daemon(void) { }
583 static inline void ftrace_release_mod(struct module
*mod
) {}
584 static inline void ftrace_module_init(struct module
*mod
) {}
585 static inline __init
int register_ftrace_command(struct ftrace_func_command
*cmd
)
589 static inline __init
int unregister_ftrace_command(char *cmd_name
)
593 static inline int ftrace_text_reserved(const void *start
, const void *end
)
597 static inline unsigned long ftrace_location(unsigned long ip
)
603 * Again users of functions that have ftrace_ops may not
604 * have them defined when ftrace is not enabled, but these
605 * functions may still be called. Use a macro instead of inline.
607 #define ftrace_regex_open(ops, flag, inod, file) ({ -ENODEV; })
608 #define ftrace_set_early_filter(ops, buf, enable) do { } while (0)
609 #define ftrace_set_filter_ip(ops, ip, remove, reset) ({ -ENODEV; })
610 #define ftrace_set_filter(ops, buf, len, reset) ({ -ENODEV; })
611 #define ftrace_set_notrace(ops, buf, len, reset) ({ -ENODEV; })
612 #define ftrace_free_filter(ops) do { } while (0)
614 static inline ssize_t
ftrace_filter_write(struct file
*file
, const char __user
*ubuf
,
615 size_t cnt
, loff_t
*ppos
) { return -ENODEV
; }
616 static inline ssize_t
ftrace_notrace_write(struct file
*file
, const char __user
*ubuf
,
617 size_t cnt
, loff_t
*ppos
) { return -ENODEV
; }
619 ftrace_regex_release(struct inode
*inode
, struct file
*file
) { return -ENODEV
; }
621 static inline bool is_ftrace_trampoline(unsigned long addr
)
625 #endif /* CONFIG_DYNAMIC_FTRACE */
627 /* totally disable ftrace - can not re-enable after this */
628 void ftrace_kill(void);
630 static inline void tracer_disable(void)
632 #ifdef CONFIG_FUNCTION_TRACER
638 * Ftrace disable/restore without lock. Some synchronization mechanism
639 * must be used to prevent ftrace_enabled to be changed between
642 static inline int __ftrace_enabled_save(void)
644 #ifdef CONFIG_FUNCTION_TRACER
645 int saved_ftrace_enabled
= ftrace_enabled
;
647 return saved_ftrace_enabled
;
653 static inline void __ftrace_enabled_restore(int enabled
)
655 #ifdef CONFIG_FUNCTION_TRACER
656 ftrace_enabled
= enabled
;
660 /* All archs should have this, but we define it for consistency */
661 #ifndef ftrace_return_address0
662 # define ftrace_return_address0 __builtin_return_address(0)
665 /* Archs may use other ways for ADDR1 and beyond */
666 #ifndef ftrace_return_address
667 # ifdef CONFIG_FRAME_POINTER
668 # define ftrace_return_address(n) __builtin_return_address(n)
670 # define ftrace_return_address(n) 0UL
674 #define CALLER_ADDR0 ((unsigned long)ftrace_return_address0)
675 #define CALLER_ADDR1 ((unsigned long)ftrace_return_address(1))
676 #define CALLER_ADDR2 ((unsigned long)ftrace_return_address(2))
677 #define CALLER_ADDR3 ((unsigned long)ftrace_return_address(3))
678 #define CALLER_ADDR4 ((unsigned long)ftrace_return_address(4))
679 #define CALLER_ADDR5 ((unsigned long)ftrace_return_address(5))
680 #define CALLER_ADDR6 ((unsigned long)ftrace_return_address(6))
682 #ifdef CONFIG_IRQSOFF_TRACER
683 extern void time_hardirqs_on(unsigned long a0
, unsigned long a1
);
684 extern void time_hardirqs_off(unsigned long a0
, unsigned long a1
);
686 static inline void time_hardirqs_on(unsigned long a0
, unsigned long a1
) { }
687 static inline void time_hardirqs_off(unsigned long a0
, unsigned long a1
) { }
690 #ifdef CONFIG_PREEMPT_TRACER
691 extern void trace_preempt_on(unsigned long a0
, unsigned long a1
);
692 extern void trace_preempt_off(unsigned long a0
, unsigned long a1
);
695 * Use defines instead of static inlines because some arches will make code out
696 * of the CALLER_ADDR, when we really want these to be a real nop.
698 # define trace_preempt_on(a0, a1) do { } while (0)
699 # define trace_preempt_off(a0, a1) do { } while (0)
702 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
703 extern void ftrace_init(void);
705 static inline void ftrace_init(void) { }
709 * Structure that defines an entry function trace.
711 struct ftrace_graph_ent
{
712 unsigned long func
; /* Current function */
717 * Structure that defines a return function trace.
719 struct ftrace_graph_ret
{
720 unsigned long func
; /* Current function */
721 unsigned long long calltime
;
722 unsigned long long rettime
;
723 /* Number of functions that overran the depth limit for current task */
724 unsigned long overrun
;
728 /* Type of the callback handlers for tracing function graph*/
729 typedef void (*trace_func_graph_ret_t
)(struct ftrace_graph_ret
*); /* return */
730 typedef int (*trace_func_graph_ent_t
)(struct ftrace_graph_ent
*); /* entry */
732 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
735 #define INIT_FTRACE_GRAPH .ret_stack = NULL,
738 * Stack of return addresses for functions
740 * Used in struct thread_info
742 struct ftrace_ret_stack
{
745 unsigned long long calltime
;
746 unsigned long long subtime
;
751 * Primary handler of a function return.
752 * It relays on ftrace_return_to_handler.
753 * Defined in entry_32/64.S
755 extern void return_to_handler(void);
758 ftrace_push_return_trace(unsigned long ret
, unsigned long func
, int *depth
,
759 unsigned long frame_pointer
);
762 * Sometimes we don't want to trace a function with the function
763 * graph tracer but we want them to keep traced by the usual function
764 * tracer if the function graph tracer is not configured.
766 #define __notrace_funcgraph notrace
769 * We want to which function is an entrypoint of a hardirq.
770 * That will help us to put a signal on output.
772 #define __irq_entry __attribute__((__section__(".irqentry.text")))
774 /* Limits of hardirq entrypoints */
775 extern char __irqentry_text_start
[];
776 extern char __irqentry_text_end
[];
778 #define FTRACE_NOTRACE_DEPTH 65536
779 #define FTRACE_RETFUNC_DEPTH 50
780 #define FTRACE_RETSTACK_ALLOC_SIZE 32
781 extern int register_ftrace_graph(trace_func_graph_ret_t retfunc
,
782 trace_func_graph_ent_t entryfunc
);
784 extern bool ftrace_graph_is_dead(void);
785 extern void ftrace_graph_stop(void);
787 /* The current handlers in use */
788 extern trace_func_graph_ret_t ftrace_graph_return
;
789 extern trace_func_graph_ent_t ftrace_graph_entry
;
791 extern void unregister_ftrace_graph(void);
793 extern void ftrace_graph_init_task(struct task_struct
*t
);
794 extern void ftrace_graph_exit_task(struct task_struct
*t
);
795 extern void ftrace_graph_init_idle_task(struct task_struct
*t
, int cpu
);
797 static inline int task_curr_ret_stack(struct task_struct
*t
)
799 return t
->curr_ret_stack
;
802 static inline void pause_graph_tracing(void)
804 atomic_inc(¤t
->tracing_graph_pause
);
807 static inline void unpause_graph_tracing(void)
809 atomic_dec(¤t
->tracing_graph_pause
);
811 #else /* !CONFIG_FUNCTION_GRAPH_TRACER */
813 #define __notrace_funcgraph
815 #define INIT_FTRACE_GRAPH
817 static inline void ftrace_graph_init_task(struct task_struct
*t
) { }
818 static inline void ftrace_graph_exit_task(struct task_struct
*t
) { }
819 static inline void ftrace_graph_init_idle_task(struct task_struct
*t
, int cpu
) { }
821 static inline int register_ftrace_graph(trace_func_graph_ret_t retfunc
,
822 trace_func_graph_ent_t entryfunc
)
826 static inline void unregister_ftrace_graph(void) { }
828 static inline int task_curr_ret_stack(struct task_struct
*tsk
)
833 static inline void pause_graph_tracing(void) { }
834 static inline void unpause_graph_tracing(void) { }
835 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
837 #ifdef CONFIG_TRACING
839 /* flags for current->trace */
841 TSK_TRACE_FL_TRACE_BIT
= 0,
842 TSK_TRACE_FL_GRAPH_BIT
= 1,
845 TSK_TRACE_FL_TRACE
= 1 << TSK_TRACE_FL_TRACE_BIT
,
846 TSK_TRACE_FL_GRAPH
= 1 << TSK_TRACE_FL_GRAPH_BIT
,
849 static inline void set_tsk_trace_trace(struct task_struct
*tsk
)
851 set_bit(TSK_TRACE_FL_TRACE_BIT
, &tsk
->trace
);
854 static inline void clear_tsk_trace_trace(struct task_struct
*tsk
)
856 clear_bit(TSK_TRACE_FL_TRACE_BIT
, &tsk
->trace
);
859 static inline int test_tsk_trace_trace(struct task_struct
*tsk
)
861 return tsk
->trace
& TSK_TRACE_FL_TRACE
;
864 static inline void set_tsk_trace_graph(struct task_struct
*tsk
)
866 set_bit(TSK_TRACE_FL_GRAPH_BIT
, &tsk
->trace
);
869 static inline void clear_tsk_trace_graph(struct task_struct
*tsk
)
871 clear_bit(TSK_TRACE_FL_GRAPH_BIT
, &tsk
->trace
);
874 static inline int test_tsk_trace_graph(struct task_struct
*tsk
)
876 return tsk
->trace
& TSK_TRACE_FL_GRAPH
;
879 enum ftrace_dump_mode
;
881 extern enum ftrace_dump_mode ftrace_dump_on_oops
;
882 extern int tracepoint_printk
;
884 extern void disable_trace_on_warning(void);
885 extern int __disable_trace_on_warning
;
887 #ifdef CONFIG_PREEMPT
888 #define INIT_TRACE_RECURSION .trace_recursion = 0,
891 #else /* CONFIG_TRACING */
892 static inline void disable_trace_on_warning(void) { }
893 #endif /* CONFIG_TRACING */
895 #ifndef INIT_TRACE_RECURSION
896 #define INIT_TRACE_RECURSION
899 #ifdef CONFIG_FTRACE_SYSCALLS
901 unsigned long arch_syscall_addr(int nr
);
903 #endif /* CONFIG_FTRACE_SYSCALLS */
905 #endif /* _LINUX_FTRACE_H */