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)
95 * DELETED - The ops are being deleted, do not let them be registered again.
98 FTRACE_OPS_FL_ENABLED = 1 << 0,
99 FTRACE_OPS_FL_GLOBAL = 1 << 1,
100 FTRACE_OPS_FL_DYNAMIC = 1 << 2,
101 FTRACE_OPS_FL_CONTROL = 1 << 3,
102 FTRACE_OPS_FL_SAVE_REGS = 1 << 4,
103 FTRACE_OPS_FL_SAVE_REGS_IF_SUPPORTED = 1 << 5,
104 FTRACE_OPS_FL_RECURSION_SAFE = 1 << 6,
105 FTRACE_OPS_FL_STUB = 1 << 7,
106 FTRACE_OPS_FL_INITIALIZED = 1 << 8,
107 FTRACE_OPS_FL_DELETED = 1 << 9,
111 * Note, ftrace_ops can be referenced outside of RCU protection.
112 * (Although, for perf, the control ops prevent that). If ftrace_ops is
113 * allocated and not part of kernel core data, the unregistering of it will
114 * perform a scheduling on all CPUs to make sure that there are no more users.
115 * Depending on the load of the system that may take a bit of time.
117 * Any private data added must also take care not to be freed and if private
118 * data is added to a ftrace_ops that is in core code, the user of the
119 * ftrace_ops must perform a schedule_on_each_cpu() before freeing it.
123 struct ftrace_ops *next;
125 int __percpu *disabled;
127 #ifdef CONFIG_DYNAMIC_FTRACE
128 struct ftrace_hash *notrace_hash;
129 struct ftrace_hash *filter_hash;
130 struct mutex regex_lock;
134 extern int function_trace_stop;
137 * Type of the current tracing.
139 enum ftrace_tracing_type_t {
140 FTRACE_TYPE_ENTER = 0, /* Hook the call of the function */
141 FTRACE_TYPE_RETURN, /* Hook the return of the function */
144 /* Current tracing type, default is FTRACE_TYPE_ENTER */
145 extern enum ftrace_tracing_type_t ftrace_tracing_type;
148 * ftrace_stop - stop function tracer.
150 * A quick way to stop the function tracer. Note this an on off switch,
151 * it is not something that is recursive like preempt_disable.
152 * This does not disable the calling of mcount, it only stops the
153 * calling of functions from mcount.
155 static inline void ftrace_stop(void)
157 function_trace_stop = 1;
161 * ftrace_start - start the function tracer.
163 * This function is the inverse of ftrace_stop. This does not enable
164 * the function tracing if the function tracer is disabled. This only
165 * sets the function tracer flag to continue calling the functions
168 static inline void ftrace_start(void)
170 function_trace_stop = 0;
174 * The ftrace_ops must be a static and should also
175 * be read_mostly. These functions do modify read_mostly variables
176 * so use them sparely. Never free an ftrace_op or modify the
177 * next pointer after it has been registered. Even after unregistering
178 * it, the next pointer may still be used internally.
180 int register_ftrace_function(struct ftrace_ops *ops);
181 int unregister_ftrace_function(struct ftrace_ops *ops);
182 void clear_ftrace_function(void);
185 * ftrace_function_local_enable - enable controlled ftrace_ops on current cpu
187 * This function enables tracing on current cpu by decreasing
188 * the per cpu control variable.
189 * It must be called with preemption disabled and only on ftrace_ops
190 * registered with FTRACE_OPS_FL_CONTROL. If called without preemption
191 * disabled, this_cpu_ptr will complain when CONFIG_DEBUG_PREEMPT is enabled.
193 static inline void ftrace_function_local_enable(struct ftrace_ops *ops)
195 if (WARN_ON_ONCE(!(ops->flags & FTRACE_OPS_FL_CONTROL)))
198 (*this_cpu_ptr(ops->disabled))--;
202 * ftrace_function_local_disable - enable controlled ftrace_ops on current cpu
204 * This function enables tracing on current cpu by decreasing
205 * the per cpu control variable.
206 * It must be called with preemption disabled and only on ftrace_ops
207 * registered with FTRACE_OPS_FL_CONTROL. If called without preemption
208 * disabled, this_cpu_ptr will complain when CONFIG_DEBUG_PREEMPT is enabled.
210 static inline void ftrace_function_local_disable(struct ftrace_ops *ops)
212 if (WARN_ON_ONCE(!(ops->flags & FTRACE_OPS_FL_CONTROL)))
215 (*this_cpu_ptr(ops->disabled))++;
219 * ftrace_function_local_disabled - returns ftrace_ops disabled value
222 * This function returns value of ftrace_ops::disabled on current cpu.
223 * It must be called with preemption disabled and only on ftrace_ops
224 * registered with FTRACE_OPS_FL_CONTROL. If called without preemption
225 * disabled, this_cpu_ptr will complain when CONFIG_DEBUG_PREEMPT is enabled.
227 static inline int ftrace_function_local_disabled(struct ftrace_ops *ops)
229 WARN_ON_ONCE(!(ops->flags & FTRACE_OPS_FL_CONTROL));
230 return *this_cpu_ptr(ops->disabled);
233 extern void ftrace_stub(unsigned long a0, unsigned long a1,
234 struct ftrace_ops *op, struct pt_regs *regs);
236 #else /* !CONFIG_FUNCTION_TRACER */
238 * (un)register_ftrace_function must be a macro since the ops parameter
239 * must not be evaluated.
241 #define register_ftrace_function(ops) ({ 0; })
242 #define unregister_ftrace_function(ops) ({ 0; })
243 static inline int ftrace_nr_registered_ops(void)
247 static inline void clear_ftrace_function(void) { }
248 static inline void ftrace_kill(void) { }
249 static inline void ftrace_stop(void) { }
250 static inline void ftrace_start(void) { }
251 #endif /* CONFIG_FUNCTION_TRACER */
253 #ifdef CONFIG_STACK_TRACER
254 extern int stack_tracer_enabled;
256 stack_trace_sysctl(struct ctl_table *table, int write,
257 void __user *buffer, size_t *lenp,
261 struct ftrace_func_command {
262 struct list_head list;
264 int (*func)(struct ftrace_hash *hash,
265 char *func, char *cmd,
266 char *params, int enable);
269 #ifdef CONFIG_DYNAMIC_FTRACE
271 int ftrace_arch_code_modify_prepare(void);
272 int ftrace_arch_code_modify_post_process(void);
274 void ftrace_bug(int err, unsigned long ip);
278 struct ftrace_probe_ops {
279 void (*func)(unsigned long ip,
280 unsigned long parent_ip,
282 int (*init)(struct ftrace_probe_ops *ops,
283 unsigned long ip, void **data);
284 void (*free)(struct ftrace_probe_ops *ops,
285 unsigned long ip, void **data);
286 int (*print)(struct seq_file *m,
288 struct ftrace_probe_ops *ops,
293 register_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops,
296 unregister_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops,
299 unregister_ftrace_function_probe_func(char *glob, struct ftrace_probe_ops *ops);
300 extern void unregister_ftrace_function_probe_all(char *glob);
302 extern int ftrace_text_reserved(const void *start, const void *end);
304 extern int ftrace_nr_registered_ops(void);
307 * The dyn_ftrace record's flags field is split into two parts.
308 * the first part which is '0-FTRACE_REF_MAX' is a counter of
309 * the number of callbacks that have registered the function that
310 * the dyn_ftrace descriptor represents.
312 * The second part is a mask:
313 * ENABLED - the function is being traced
314 * REGS - the record wants the function to save regs
315 * REGS_EN - the function is set up to save regs.
317 * When a new ftrace_ops is registered and wants a function to save
318 * pt_regs, the rec->flag REGS is set. When the function has been
319 * set up to save regs, the REG_EN flag is set. Once a function
320 * starts saving regs it will do so until all ftrace_ops are removed
321 * from tracing that function.
324 FTRACE_FL_ENABLED = (1UL << 29),
325 FTRACE_FL_REGS = (1UL << 30),
326 FTRACE_FL_REGS_EN = (1UL << 31)
329 #define FTRACE_FL_MASK (0x7UL << 29)
330 #define FTRACE_REF_MAX ((1UL << 29) - 1)
333 unsigned long ip; /* address of mcount call-site */
335 struct dyn_arch_ftrace arch;
338 int ftrace_force_update(void);
339 int ftrace_set_filter_ip(struct ftrace_ops *ops, unsigned long ip,
340 int remove, int reset);
341 int ftrace_set_filter(struct ftrace_ops *ops, unsigned char *buf,
343 int ftrace_set_notrace(struct ftrace_ops *ops, unsigned char *buf,
345 void ftrace_set_global_filter(unsigned char *buf, int len, int reset);
346 void ftrace_set_global_notrace(unsigned char *buf, int len, int reset);
347 void ftrace_free_filter(struct ftrace_ops *ops);
349 int register_ftrace_command(struct ftrace_func_command *cmd);
350 int unregister_ftrace_command(struct ftrace_func_command *cmd);
353 FTRACE_UPDATE_CALLS = (1 << 0),
354 FTRACE_DISABLE_CALLS = (1 << 1),
355 FTRACE_UPDATE_TRACE_FUNC = (1 << 2),
356 FTRACE_START_FUNC_RET = (1 << 3),
357 FTRACE_STOP_FUNC_RET = (1 << 4),
361 * The FTRACE_UPDATE_* enum is used to pass information back
362 * from the ftrace_update_record() and ftrace_test_record()
363 * functions. These are called by the code update routines
364 * to find out what is to be done for a given function.
366 * IGNORE - The function is already what we want it to be
367 * MAKE_CALL - Start tracing the function
368 * MODIFY_CALL - Stop saving regs for the function
369 * MODIFY_CALL_REGS - Start saving regs for the function
370 * MAKE_NOP - Stop tracing the function
373 FTRACE_UPDATE_IGNORE,
374 FTRACE_UPDATE_MAKE_CALL,
375 FTRACE_UPDATE_MODIFY_CALL,
376 FTRACE_UPDATE_MODIFY_CALL_REGS,
377 FTRACE_UPDATE_MAKE_NOP,
381 FTRACE_ITER_FILTER = (1 << 0),
382 FTRACE_ITER_NOTRACE = (1 << 1),
383 FTRACE_ITER_PRINTALL = (1 << 2),
384 FTRACE_ITER_DO_HASH = (1 << 3),
385 FTRACE_ITER_HASH = (1 << 4),
386 FTRACE_ITER_ENABLED = (1 << 5),
389 void arch_ftrace_update_code(int command);
391 struct ftrace_rec_iter;
393 struct ftrace_rec_iter *ftrace_rec_iter_start(void);
394 struct ftrace_rec_iter *ftrace_rec_iter_next(struct ftrace_rec_iter *iter);
395 struct dyn_ftrace *ftrace_rec_iter_record(struct ftrace_rec_iter *iter);
397 #define for_ftrace_rec_iter(iter) \
398 for (iter = ftrace_rec_iter_start(); \
400 iter = ftrace_rec_iter_next(iter))
403 int ftrace_update_record(struct dyn_ftrace *rec, int enable);
404 int ftrace_test_record(struct dyn_ftrace *rec, int enable);
405 void ftrace_run_stop_machine(int command);
406 unsigned long ftrace_location(unsigned long ip);
408 extern ftrace_func_t ftrace_trace_function;
410 int ftrace_regex_open(struct ftrace_ops *ops, int flag,
411 struct inode *inode, struct file *file);
412 ssize_t ftrace_filter_write(struct file *file, const char __user *ubuf,
413 size_t cnt, loff_t *ppos);
414 ssize_t ftrace_notrace_write(struct file *file, const char __user *ubuf,
415 size_t cnt, loff_t *ppos);
416 int ftrace_regex_release(struct inode *inode, struct file *file);
419 ftrace_set_early_filter(struct ftrace_ops *ops, char *buf, int enable);
421 /* defined in arch */
422 extern int ftrace_ip_converted(unsigned long ip);
423 extern int ftrace_dyn_arch_init(void);
424 extern void ftrace_replace_code(int enable);
425 extern int ftrace_update_ftrace_func(ftrace_func_t func);
426 extern void ftrace_caller(void);
427 extern void ftrace_regs_caller(void);
428 extern void ftrace_call(void);
429 extern void ftrace_regs_call(void);
430 extern void mcount_call(void);
432 void ftrace_modify_all_code(int command);
435 #define FTRACE_ADDR ((unsigned long)ftrace_caller)
438 #ifndef FTRACE_REGS_ADDR
439 #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
440 # define FTRACE_REGS_ADDR ((unsigned long)ftrace_regs_caller)
442 # define FTRACE_REGS_ADDR FTRACE_ADDR
446 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
447 extern void ftrace_graph_caller(void);
448 extern int ftrace_enable_ftrace_graph_caller(void);
449 extern int ftrace_disable_ftrace_graph_caller(void);
451 static inline int ftrace_enable_ftrace_graph_caller(void) { return 0; }
452 static inline int ftrace_disable_ftrace_graph_caller(void) { return 0; }
456 * ftrace_make_nop - convert code into nop
457 * @mod: module structure if called by module load initialization
458 * @rec: the mcount call site record
459 * @addr: the address that the call site should be calling
461 * This is a very sensitive operation and great care needs
462 * to be taken by the arch. The operation should carefully
463 * read the location, check to see if what is read is indeed
464 * what we expect it to be, and then on success of the compare,
465 * it should write to the location.
467 * The code segment at @rec->ip should be a caller to @addr
471 * -EFAULT on error reading the location
472 * -EINVAL on a failed compare of the contents
473 * -EPERM on error writing to the location
474 * Any other value will be considered a failure.
476 extern int ftrace_make_nop(struct module *mod,
477 struct dyn_ftrace *rec, unsigned long addr);
480 * ftrace_make_call - convert a nop call site into a call to addr
481 * @rec: the mcount call site record
482 * @addr: the address that the call site should call
484 * This is a very sensitive operation and great care needs
485 * to be taken by the arch. The operation should carefully
486 * read the location, check to see if what is read is indeed
487 * what we expect it to be, and then on success of the compare,
488 * it should write to the location.
490 * The code segment at @rec->ip should be a nop
494 * -EFAULT on error reading the location
495 * -EINVAL on a failed compare of the contents
496 * -EPERM on error writing to the location
497 * Any other value will be considered a failure.
499 extern int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr);
501 #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
503 * ftrace_modify_call - convert from one addr to another (no nop)
504 * @rec: the mcount call site record
505 * @old_addr: the address expected to be currently called to
506 * @addr: the address to change to
508 * This is a very sensitive operation and great care needs
509 * to be taken by the arch. The operation should carefully
510 * read the location, check to see if what is read is indeed
511 * what we expect it to be, and then on success of the compare,
512 * it should write to the location.
514 * The code segment at @rec->ip should be a caller to @old_addr
518 * -EFAULT on error reading the location
519 * -EINVAL on a failed compare of the contents
520 * -EPERM on error writing to the location
521 * Any other value will be considered a failure.
523 extern int ftrace_modify_call(struct dyn_ftrace *rec, unsigned long old_addr,
526 /* Should never be called */
527 static inline int ftrace_modify_call(struct dyn_ftrace *rec, unsigned long old_addr,
534 /* May be defined in arch */
535 extern int ftrace_arch_read_dyn_info(char *buf, int size);
537 extern int skip_trace(unsigned long ip);
539 extern void ftrace_disable_daemon(void);
540 extern void ftrace_enable_daemon(void);
541 #else /* CONFIG_DYNAMIC_FTRACE */
542 static inline int skip_trace(unsigned long ip) { return 0; }
543 static inline int ftrace_force_update(void) { return 0; }
544 static inline void ftrace_disable_daemon(void) { }
545 static inline void ftrace_enable_daemon(void) { }
546 static inline void ftrace_release_mod(struct module *mod) {}
547 static inline __init int register_ftrace_command(struct ftrace_func_command *cmd)
551 static inline __init int unregister_ftrace_command(char *cmd_name)
555 static inline int ftrace_text_reserved(const void *start, const void *end)
559 static inline unsigned long ftrace_location(unsigned long ip)
565 * Again users of functions that have ftrace_ops may not
566 * have them defined when ftrace is not enabled, but these
567 * functions may still be called. Use a macro instead of inline.
569 #define ftrace_regex_open(ops, flag, inod, file) ({ -ENODEV; })
570 #define ftrace_set_early_filter(ops, buf, enable) do { } while (0)
571 #define ftrace_set_filter_ip(ops, ip, remove, reset) ({ -ENODEV; })
572 #define ftrace_set_filter(ops, buf, len, reset) ({ -ENODEV; })
573 #define ftrace_set_notrace(ops, buf, len, reset) ({ -ENODEV; })
574 #define ftrace_free_filter(ops) do { } while (0)
576 static inline ssize_t ftrace_filter_write(struct file *file, const char __user *ubuf,
577 size_t cnt, loff_t *ppos) { return -ENODEV; }
578 static inline ssize_t ftrace_notrace_write(struct file *file, const char __user *ubuf,
579 size_t cnt, loff_t *ppos) { return -ENODEV; }
581 ftrace_regex_release(struct inode *inode, struct file *file) { return -ENODEV; }
582 #endif /* CONFIG_DYNAMIC_FTRACE */
584 /* totally disable ftrace - can not re-enable after this */
585 void ftrace_kill(void);
587 static inline void tracer_disable(void)
589 #ifdef CONFIG_FUNCTION_TRACER
595 * Ftrace disable/restore without lock. Some synchronization mechanism
596 * must be used to prevent ftrace_enabled to be changed between
599 static inline int __ftrace_enabled_save(void)
601 #ifdef CONFIG_FUNCTION_TRACER
602 int saved_ftrace_enabled = ftrace_enabled;
604 return saved_ftrace_enabled;
610 static inline void __ftrace_enabled_restore(int enabled)
612 #ifdef CONFIG_FUNCTION_TRACER
613 ftrace_enabled = enabled;
617 #ifndef HAVE_ARCH_CALLER_ADDR
618 # ifdef CONFIG_FRAME_POINTER
619 # define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0))
620 # define CALLER_ADDR1 ((unsigned long)__builtin_return_address(1))
621 # define CALLER_ADDR2 ((unsigned long)__builtin_return_address(2))
622 # define CALLER_ADDR3 ((unsigned long)__builtin_return_address(3))
623 # define CALLER_ADDR4 ((unsigned long)__builtin_return_address(4))
624 # define CALLER_ADDR5 ((unsigned long)__builtin_return_address(5))
625 # define CALLER_ADDR6 ((unsigned long)__builtin_return_address(6))
627 # define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0))
628 # define CALLER_ADDR1 0UL
629 # define CALLER_ADDR2 0UL
630 # define CALLER_ADDR3 0UL
631 # define CALLER_ADDR4 0UL
632 # define CALLER_ADDR5 0UL
633 # define CALLER_ADDR6 0UL
635 #endif /* ifndef HAVE_ARCH_CALLER_ADDR */
637 #ifdef CONFIG_IRQSOFF_TRACER
638 extern void time_hardirqs_on(unsigned long a0, unsigned long a1);
639 extern void time_hardirqs_off(unsigned long a0, unsigned long a1);
641 static inline void time_hardirqs_on(unsigned long a0, unsigned long a1) { }
642 static inline void time_hardirqs_off(unsigned long a0, unsigned long a1) { }
645 #ifdef CONFIG_PREEMPT_TRACER
646 extern void trace_preempt_on(unsigned long a0, unsigned long a1);
647 extern void trace_preempt_off(unsigned long a0, unsigned long a1);
650 * Use defines instead of static inlines because some arches will make code out
651 * of the CALLER_ADDR, when we really want these to be a real nop.
653 # define trace_preempt_on(a0, a1) do { } while (0)
654 # define trace_preempt_off(a0, a1) do { } while (0)
657 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
658 extern void ftrace_init(void);
660 static inline void ftrace_init(void) { }
664 * Structure that defines an entry function trace.
666 struct ftrace_graph_ent {
667 unsigned long func; /* Current function */
672 * Structure that defines a return function trace.
674 struct ftrace_graph_ret {
675 unsigned long func; /* Current function */
676 unsigned long long calltime;
677 unsigned long long rettime;
678 /* Number of functions that overran the depth limit for current task */
679 unsigned long overrun;
683 /* Type of the callback handlers for tracing function graph*/
684 typedef void (*trace_func_graph_ret_t)(struct ftrace_graph_ret *); /* return */
685 typedef int (*trace_func_graph_ent_t)(struct ftrace_graph_ent *); /* entry */
687 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
690 #define INIT_FTRACE_GRAPH .ret_stack = NULL,
693 * Stack of return addresses for functions
695 * Used in struct thread_info
697 struct ftrace_ret_stack {
700 unsigned long long calltime;
701 unsigned long long subtime;
706 * Primary handler of a function return.
707 * It relays on ftrace_return_to_handler.
708 * Defined in entry_32/64.S
710 extern void return_to_handler(void);
713 ftrace_push_return_trace(unsigned long ret, unsigned long func, int *depth,
714 unsigned long frame_pointer);
717 * Sometimes we don't want to trace a function with the function
718 * graph tracer but we want them to keep traced by the usual function
719 * tracer if the function graph tracer is not configured.
721 #define __notrace_funcgraph notrace
724 * We want to which function is an entrypoint of a hardirq.
725 * That will help us to put a signal on output.
727 #define __irq_entry __attribute__((__section__(".irqentry.text")))
729 /* Limits of hardirq entrypoints */
730 extern char __irqentry_text_start[];
731 extern char __irqentry_text_end[];
733 #define FTRACE_NOTRACE_DEPTH 65536
734 #define FTRACE_RETFUNC_DEPTH 50
735 #define FTRACE_RETSTACK_ALLOC_SIZE 32
736 extern int register_ftrace_graph(trace_func_graph_ret_t retfunc,
737 trace_func_graph_ent_t entryfunc);
739 extern void ftrace_graph_stop(void);
741 /* The current handlers in use */
742 extern trace_func_graph_ret_t ftrace_graph_return;
743 extern trace_func_graph_ent_t ftrace_graph_entry;
745 extern void unregister_ftrace_graph(void);
747 extern void ftrace_graph_init_task(struct task_struct *t);
748 extern void ftrace_graph_exit_task(struct task_struct *t);
749 extern void ftrace_graph_init_idle_task(struct task_struct *t, int cpu);
751 static inline int task_curr_ret_stack(struct task_struct *t)
753 return t->curr_ret_stack;
756 static inline void pause_graph_tracing(void)
758 atomic_inc(¤t->tracing_graph_pause);
761 static inline void unpause_graph_tracing(void)
763 atomic_dec(¤t->tracing_graph_pause);
765 #else /* !CONFIG_FUNCTION_GRAPH_TRACER */
767 #define __notrace_funcgraph
769 #define INIT_FTRACE_GRAPH
771 static inline void ftrace_graph_init_task(struct task_struct *t) { }
772 static inline void ftrace_graph_exit_task(struct task_struct *t) { }
773 static inline void ftrace_graph_init_idle_task(struct task_struct *t, int cpu) { }
775 static inline int register_ftrace_graph(trace_func_graph_ret_t retfunc,
776 trace_func_graph_ent_t entryfunc)
780 static inline void unregister_ftrace_graph(void) { }
782 static inline int task_curr_ret_stack(struct task_struct *tsk)
787 static inline void pause_graph_tracing(void) { }
788 static inline void unpause_graph_tracing(void) { }
789 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
791 #ifdef CONFIG_TRACING
793 /* flags for current->trace */
795 TSK_TRACE_FL_TRACE_BIT = 0,
796 TSK_TRACE_FL_GRAPH_BIT = 1,
799 TSK_TRACE_FL_TRACE = 1 << TSK_TRACE_FL_TRACE_BIT,
800 TSK_TRACE_FL_GRAPH = 1 << TSK_TRACE_FL_GRAPH_BIT,
803 static inline void set_tsk_trace_trace(struct task_struct *tsk)
805 set_bit(TSK_TRACE_FL_TRACE_BIT, &tsk->trace);
808 static inline void clear_tsk_trace_trace(struct task_struct *tsk)
810 clear_bit(TSK_TRACE_FL_TRACE_BIT, &tsk->trace);
813 static inline int test_tsk_trace_trace(struct task_struct *tsk)
815 return tsk->trace & TSK_TRACE_FL_TRACE;
818 static inline void set_tsk_trace_graph(struct task_struct *tsk)
820 set_bit(TSK_TRACE_FL_GRAPH_BIT, &tsk->trace);
823 static inline void clear_tsk_trace_graph(struct task_struct *tsk)
825 clear_bit(TSK_TRACE_FL_GRAPH_BIT, &tsk->trace);
828 static inline int test_tsk_trace_graph(struct task_struct *tsk)
830 return tsk->trace & TSK_TRACE_FL_GRAPH;
833 enum ftrace_dump_mode;
835 extern enum ftrace_dump_mode ftrace_dump_on_oops;
837 extern void disable_trace_on_warning(void);
838 extern int __disable_trace_on_warning;
840 #ifdef CONFIG_PREEMPT
841 #define INIT_TRACE_RECURSION .trace_recursion = 0,
844 #else /* CONFIG_TRACING */
845 static inline void disable_trace_on_warning(void) { }
846 #endif /* CONFIG_TRACING */
848 #ifndef INIT_TRACE_RECURSION
849 #define INIT_TRACE_RECURSION
852 #ifdef CONFIG_FTRACE_SYSCALLS
854 unsigned long arch_syscall_addr(int nr);
856 #endif /* CONFIG_FTRACE_SYSCALLS */
858 #endif /* _LINUX_FTRACE_H */