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 * (ARCH_SUPPORTS_FTRACE_SAVE_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.
94 FTRACE_OPS_FL_ENABLED = 1 << 0,
95 FTRACE_OPS_FL_GLOBAL = 1 << 1,
96 FTRACE_OPS_FL_DYNAMIC = 1 << 2,
97 FTRACE_OPS_FL_CONTROL = 1 << 3,
98 FTRACE_OPS_FL_SAVE_REGS = 1 << 4,
99 FTRACE_OPS_FL_SAVE_REGS_IF_SUPPORTED = 1 << 5,
100 FTRACE_OPS_FL_RECURSION_SAFE = 1 << 6,
105 struct ftrace_ops *next;
107 int __percpu *disabled;
108 #ifdef CONFIG_DYNAMIC_FTRACE
109 struct ftrace_hash *notrace_hash;
110 struct ftrace_hash *filter_hash;
114 extern int function_trace_stop;
117 * Type of the current tracing.
119 enum ftrace_tracing_type_t {
120 FTRACE_TYPE_ENTER = 0, /* Hook the call of the function */
121 FTRACE_TYPE_RETURN, /* Hook the return of the function */
124 /* Current tracing type, default is FTRACE_TYPE_ENTER */
125 extern enum ftrace_tracing_type_t ftrace_tracing_type;
128 * ftrace_stop - stop function tracer.
130 * A quick way to stop the function tracer. Note this an on off switch,
131 * it is not something that is recursive like preempt_disable.
132 * This does not disable the calling of mcount, it only stops the
133 * calling of functions from mcount.
135 static inline void ftrace_stop(void)
137 function_trace_stop = 1;
141 * ftrace_start - start the function tracer.
143 * This function is the inverse of ftrace_stop. This does not enable
144 * the function tracing if the function tracer is disabled. This only
145 * sets the function tracer flag to continue calling the functions
148 static inline void ftrace_start(void)
150 function_trace_stop = 0;
154 * The ftrace_ops must be a static and should also
155 * be read_mostly. These functions do modify read_mostly variables
156 * so use them sparely. Never free an ftrace_op or modify the
157 * next pointer after it has been registered. Even after unregistering
158 * it, the next pointer may still be used internally.
160 int register_ftrace_function(struct ftrace_ops *ops);
161 int unregister_ftrace_function(struct ftrace_ops *ops);
162 void clear_ftrace_function(void);
165 * ftrace_function_local_enable - enable controlled ftrace_ops on current cpu
167 * This function enables tracing on current cpu by decreasing
168 * the per cpu control variable.
169 * It must be called with preemption disabled and only on ftrace_ops
170 * registered with FTRACE_OPS_FL_CONTROL. If called without preemption
171 * disabled, this_cpu_ptr will complain when CONFIG_DEBUG_PREEMPT is enabled.
173 static inline void ftrace_function_local_enable(struct ftrace_ops *ops)
175 if (WARN_ON_ONCE(!(ops->flags & FTRACE_OPS_FL_CONTROL)))
178 (*this_cpu_ptr(ops->disabled))--;
182 * ftrace_function_local_disable - enable controlled ftrace_ops on current cpu
184 * This function enables tracing on current cpu by decreasing
185 * the per cpu control variable.
186 * It must be called with preemption disabled and only on ftrace_ops
187 * registered with FTRACE_OPS_FL_CONTROL. If called without preemption
188 * disabled, this_cpu_ptr will complain when CONFIG_DEBUG_PREEMPT is enabled.
190 static inline void ftrace_function_local_disable(struct ftrace_ops *ops)
192 if (WARN_ON_ONCE(!(ops->flags & FTRACE_OPS_FL_CONTROL)))
195 (*this_cpu_ptr(ops->disabled))++;
199 * ftrace_function_local_disabled - returns ftrace_ops disabled value
202 * This function returns value of ftrace_ops::disabled on current cpu.
203 * It must be called with preemption disabled and only on ftrace_ops
204 * registered with FTRACE_OPS_FL_CONTROL. If called without preemption
205 * disabled, this_cpu_ptr will complain when CONFIG_DEBUG_PREEMPT is enabled.
207 static inline int ftrace_function_local_disabled(struct ftrace_ops *ops)
209 WARN_ON_ONCE(!(ops->flags & FTRACE_OPS_FL_CONTROL));
210 return *this_cpu_ptr(ops->disabled);
213 extern void ftrace_stub(unsigned long a0, unsigned long a1,
214 struct ftrace_ops *op, struct pt_regs *regs);
216 #else /* !CONFIG_FUNCTION_TRACER */
218 * (un)register_ftrace_function must be a macro since the ops parameter
219 * must not be evaluated.
221 #define register_ftrace_function(ops) ({ 0; })
222 #define unregister_ftrace_function(ops) ({ 0; })
223 static inline int ftrace_nr_registered_ops(void)
227 static inline void clear_ftrace_function(void) { }
228 static inline void ftrace_kill(void) { }
229 static inline void ftrace_stop(void) { }
230 static inline void ftrace_start(void) { }
231 #endif /* CONFIG_FUNCTION_TRACER */
233 #ifdef CONFIG_STACK_TRACER
234 extern int stack_tracer_enabled;
236 stack_trace_sysctl(struct ctl_table *table, int write,
237 void __user *buffer, size_t *lenp,
241 struct ftrace_func_command {
242 struct list_head list;
244 int (*func)(struct ftrace_hash *hash,
245 char *func, char *cmd,
246 char *params, int enable);
249 #ifdef CONFIG_DYNAMIC_FTRACE
251 int ftrace_arch_code_modify_prepare(void);
252 int ftrace_arch_code_modify_post_process(void);
254 void ftrace_bug(int err, unsigned long ip);
258 struct ftrace_probe_ops {
259 void (*func)(unsigned long ip,
260 unsigned long parent_ip,
262 int (*callback)(unsigned long ip, void **data);
263 void (*free)(void **data);
264 int (*print)(struct seq_file *m,
266 struct ftrace_probe_ops *ops,
271 register_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops,
274 unregister_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops,
277 unregister_ftrace_function_probe_func(char *glob, struct ftrace_probe_ops *ops);
278 extern void unregister_ftrace_function_probe_all(char *glob);
280 extern int ftrace_text_reserved(void *start, void *end);
282 extern int ftrace_nr_registered_ops(void);
285 * The dyn_ftrace record's flags field is split into two parts.
286 * the first part which is '0-FTRACE_REF_MAX' is a counter of
287 * the number of callbacks that have registered the function that
288 * the dyn_ftrace descriptor represents.
290 * The second part is a mask:
291 * ENABLED - the function is being traced
292 * REGS - the record wants the function to save regs
293 * REGS_EN - the function is set up to save regs.
295 * When a new ftrace_ops is registered and wants a function to save
296 * pt_regs, the rec->flag REGS is set. When the function has been
297 * set up to save regs, the REG_EN flag is set. Once a function
298 * starts saving regs it will do so until all ftrace_ops are removed
299 * from tracing that function.
302 FTRACE_FL_ENABLED = (1UL << 29),
303 FTRACE_FL_REGS = (1UL << 30),
304 FTRACE_FL_REGS_EN = (1UL << 31)
307 #define FTRACE_FL_MASK (0x7UL << 29)
308 #define FTRACE_REF_MAX ((1UL << 29) - 1)
312 unsigned long ip; /* address of mcount call-site */
313 struct dyn_ftrace *freelist;
316 struct dyn_arch_ftrace arch;
319 int ftrace_force_update(void);
320 int ftrace_set_filter_ip(struct ftrace_ops *ops, unsigned long ip,
321 int remove, int reset);
322 int ftrace_set_filter(struct ftrace_ops *ops, unsigned char *buf,
324 int ftrace_set_notrace(struct ftrace_ops *ops, unsigned char *buf,
326 void ftrace_set_global_filter(unsigned char *buf, int len, int reset);
327 void ftrace_set_global_notrace(unsigned char *buf, int len, int reset);
328 void ftrace_free_filter(struct ftrace_ops *ops);
330 int register_ftrace_command(struct ftrace_func_command *cmd);
331 int unregister_ftrace_command(struct ftrace_func_command *cmd);
334 FTRACE_UPDATE_CALLS = (1 << 0),
335 FTRACE_DISABLE_CALLS = (1 << 1),
336 FTRACE_UPDATE_TRACE_FUNC = (1 << 2),
337 FTRACE_START_FUNC_RET = (1 << 3),
338 FTRACE_STOP_FUNC_RET = (1 << 4),
342 * The FTRACE_UPDATE_* enum is used to pass information back
343 * from the ftrace_update_record() and ftrace_test_record()
344 * functions. These are called by the code update routines
345 * to find out what is to be done for a given function.
347 * IGNORE - The function is already what we want it to be
348 * MAKE_CALL - Start tracing the function
349 * MODIFY_CALL - Stop saving regs for the function
350 * MODIFY_CALL_REGS - Start saving regs for the function
351 * MAKE_NOP - Stop tracing the function
354 FTRACE_UPDATE_IGNORE,
355 FTRACE_UPDATE_MAKE_CALL,
356 FTRACE_UPDATE_MODIFY_CALL,
357 FTRACE_UPDATE_MODIFY_CALL_REGS,
358 FTRACE_UPDATE_MAKE_NOP,
362 FTRACE_ITER_FILTER = (1 << 0),
363 FTRACE_ITER_NOTRACE = (1 << 1),
364 FTRACE_ITER_PRINTALL = (1 << 2),
365 FTRACE_ITER_DO_HASH = (1 << 3),
366 FTRACE_ITER_HASH = (1 << 4),
367 FTRACE_ITER_ENABLED = (1 << 5),
370 void arch_ftrace_update_code(int command);
372 struct ftrace_rec_iter;
374 struct ftrace_rec_iter *ftrace_rec_iter_start(void);
375 struct ftrace_rec_iter *ftrace_rec_iter_next(struct ftrace_rec_iter *iter);
376 struct dyn_ftrace *ftrace_rec_iter_record(struct ftrace_rec_iter *iter);
378 #define for_ftrace_rec_iter(iter) \
379 for (iter = ftrace_rec_iter_start(); \
381 iter = ftrace_rec_iter_next(iter))
384 int ftrace_update_record(struct dyn_ftrace *rec, int enable);
385 int ftrace_test_record(struct dyn_ftrace *rec, int enable);
386 void ftrace_run_stop_machine(int command);
387 unsigned long ftrace_location(unsigned long ip);
389 extern ftrace_func_t ftrace_trace_function;
391 int ftrace_regex_open(struct ftrace_ops *ops, int flag,
392 struct inode *inode, struct file *file);
393 ssize_t ftrace_filter_write(struct file *file, const char __user *ubuf,
394 size_t cnt, loff_t *ppos);
395 ssize_t ftrace_notrace_write(struct file *file, const char __user *ubuf,
396 size_t cnt, loff_t *ppos);
397 loff_t ftrace_regex_lseek(struct file *file, loff_t offset, int whence);
398 int ftrace_regex_release(struct inode *inode, struct file *file);
401 ftrace_set_early_filter(struct ftrace_ops *ops, char *buf, int enable);
403 /* defined in arch */
404 extern int ftrace_ip_converted(unsigned long ip);
405 extern int ftrace_dyn_arch_init(void *data);
406 extern void ftrace_replace_code(int enable);
407 extern int ftrace_update_ftrace_func(ftrace_func_t func);
408 extern void ftrace_caller(void);
409 extern void ftrace_regs_caller(void);
410 extern void ftrace_call(void);
411 extern void ftrace_regs_call(void);
412 extern void mcount_call(void);
414 void ftrace_modify_all_code(int command);
417 #define FTRACE_ADDR ((unsigned long)ftrace_caller)
420 #ifndef FTRACE_REGS_ADDR
421 #ifdef ARCH_SUPPORTS_FTRACE_SAVE_REGS
422 # define FTRACE_REGS_ADDR ((unsigned long)ftrace_regs_caller)
424 # define FTRACE_REGS_ADDR FTRACE_ADDR
428 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
429 extern void ftrace_graph_caller(void);
430 extern int ftrace_enable_ftrace_graph_caller(void);
431 extern int ftrace_disable_ftrace_graph_caller(void);
433 static inline int ftrace_enable_ftrace_graph_caller(void) { return 0; }
434 static inline int ftrace_disable_ftrace_graph_caller(void) { return 0; }
438 * ftrace_make_nop - convert code into nop
439 * @mod: module structure if called by module load initialization
440 * @rec: the mcount call site record
441 * @addr: the address that the call site should be calling
443 * This is a very sensitive operation and great care needs
444 * to be taken by the arch. The operation should carefully
445 * read the location, check to see if what is read is indeed
446 * what we expect it to be, and then on success of the compare,
447 * it should write to the location.
449 * The code segment at @rec->ip should be a caller to @addr
453 * -EFAULT on error reading the location
454 * -EINVAL on a failed compare of the contents
455 * -EPERM on error writing to the location
456 * Any other value will be considered a failure.
458 extern int ftrace_make_nop(struct module *mod,
459 struct dyn_ftrace *rec, unsigned long addr);
462 * ftrace_make_call - convert a nop call site into a call to addr
463 * @rec: the mcount call site record
464 * @addr: the address that the call site should call
466 * This is a very sensitive operation and great care needs
467 * to be taken by the arch. The operation should carefully
468 * read the location, check to see if what is read is indeed
469 * what we expect it to be, and then on success of the compare,
470 * it should write to the location.
472 * The code segment at @rec->ip should be a nop
476 * -EFAULT on error reading the location
477 * -EINVAL on a failed compare of the contents
478 * -EPERM on error writing to the location
479 * Any other value will be considered a failure.
481 extern int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr);
483 #ifdef ARCH_SUPPORTS_FTRACE_SAVE_REGS
485 * ftrace_modify_call - convert from one addr to another (no nop)
486 * @rec: the mcount call site record
487 * @old_addr: the address expected to be currently called to
488 * @addr: the address to change to
490 * This is a very sensitive operation and great care needs
491 * to be taken by the arch. The operation should carefully
492 * read the location, check to see if what is read is indeed
493 * what we expect it to be, and then on success of the compare,
494 * it should write to the location.
496 * The code segment at @rec->ip should be a caller to @old_addr
500 * -EFAULT on error reading the location
501 * -EINVAL on a failed compare of the contents
502 * -EPERM on error writing to the location
503 * Any other value will be considered a failure.
505 extern int ftrace_modify_call(struct dyn_ftrace *rec, unsigned long old_addr,
508 /* Should never be called */
509 static inline int ftrace_modify_call(struct dyn_ftrace *rec, unsigned long old_addr,
516 /* May be defined in arch */
517 extern int ftrace_arch_read_dyn_info(char *buf, int size);
519 extern int skip_trace(unsigned long ip);
521 extern void ftrace_disable_daemon(void);
522 extern void ftrace_enable_daemon(void);
523 #else /* CONFIG_DYNAMIC_FTRACE */
524 static inline int skip_trace(unsigned long ip) { return 0; }
525 static inline int ftrace_force_update(void) { return 0; }
526 static inline void ftrace_disable_daemon(void) { }
527 static inline void ftrace_enable_daemon(void) { }
528 static inline void ftrace_release_mod(struct module *mod) {}
529 static inline int register_ftrace_command(struct ftrace_func_command *cmd)
533 static inline int unregister_ftrace_command(char *cmd_name)
537 static inline int ftrace_text_reserved(void *start, void *end)
541 static inline unsigned long ftrace_location(unsigned long ip)
547 * Again users of functions that have ftrace_ops may not
548 * have them defined when ftrace is not enabled, but these
549 * functions may still be called. Use a macro instead of inline.
551 #define ftrace_regex_open(ops, flag, inod, file) ({ -ENODEV; })
552 #define ftrace_set_early_filter(ops, buf, enable) do { } while (0)
553 #define ftrace_set_filter_ip(ops, ip, remove, reset) ({ -ENODEV; })
554 #define ftrace_set_filter(ops, buf, len, reset) ({ -ENODEV; })
555 #define ftrace_set_notrace(ops, buf, len, reset) ({ -ENODEV; })
556 #define ftrace_free_filter(ops) do { } while (0)
558 static inline ssize_t ftrace_filter_write(struct file *file, const char __user *ubuf,
559 size_t cnt, loff_t *ppos) { return -ENODEV; }
560 static inline ssize_t ftrace_notrace_write(struct file *file, const char __user *ubuf,
561 size_t cnt, loff_t *ppos) { return -ENODEV; }
562 static inline loff_t ftrace_regex_lseek(struct file *file, loff_t offset, int whence)
567 ftrace_regex_release(struct inode *inode, struct file *file) { return -ENODEV; }
568 #endif /* CONFIG_DYNAMIC_FTRACE */
570 /* totally disable ftrace - can not re-enable after this */
571 void ftrace_kill(void);
573 static inline void tracer_disable(void)
575 #ifdef CONFIG_FUNCTION_TRACER
581 * Ftrace disable/restore without lock. Some synchronization mechanism
582 * must be used to prevent ftrace_enabled to be changed between
585 static inline int __ftrace_enabled_save(void)
587 #ifdef CONFIG_FUNCTION_TRACER
588 int saved_ftrace_enabled = ftrace_enabled;
590 return saved_ftrace_enabled;
596 static inline void __ftrace_enabled_restore(int enabled)
598 #ifdef CONFIG_FUNCTION_TRACER
599 ftrace_enabled = enabled;
603 #ifndef HAVE_ARCH_CALLER_ADDR
604 # ifdef CONFIG_FRAME_POINTER
605 # define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0))
606 # define CALLER_ADDR1 ((unsigned long)__builtin_return_address(1))
607 # define CALLER_ADDR2 ((unsigned long)__builtin_return_address(2))
608 # define CALLER_ADDR3 ((unsigned long)__builtin_return_address(3))
609 # define CALLER_ADDR4 ((unsigned long)__builtin_return_address(4))
610 # define CALLER_ADDR5 ((unsigned long)__builtin_return_address(5))
611 # define CALLER_ADDR6 ((unsigned long)__builtin_return_address(6))
613 # define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0))
614 # define CALLER_ADDR1 0UL
615 # define CALLER_ADDR2 0UL
616 # define CALLER_ADDR3 0UL
617 # define CALLER_ADDR4 0UL
618 # define CALLER_ADDR5 0UL
619 # define CALLER_ADDR6 0UL
621 #endif /* ifndef HAVE_ARCH_CALLER_ADDR */
623 #ifdef CONFIG_IRQSOFF_TRACER
624 extern void time_hardirqs_on(unsigned long a0, unsigned long a1);
625 extern void time_hardirqs_off(unsigned long a0, unsigned long a1);
627 static inline void time_hardirqs_on(unsigned long a0, unsigned long a1) { }
628 static inline void time_hardirqs_off(unsigned long a0, unsigned long a1) { }
631 #ifdef CONFIG_PREEMPT_TRACER
632 extern void trace_preempt_on(unsigned long a0, unsigned long a1);
633 extern void trace_preempt_off(unsigned long a0, unsigned long a1);
636 * Use defines instead of static inlines because some arches will make code out
637 * of the CALLER_ADDR, when we really want these to be a real nop.
639 # define trace_preempt_on(a0, a1) do { } while (0)
640 # define trace_preempt_off(a0, a1) do { } while (0)
643 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
644 extern void ftrace_init(void);
646 static inline void ftrace_init(void) { }
650 * Structure that defines an entry function trace.
652 struct ftrace_graph_ent {
653 unsigned long func; /* Current function */
658 * Structure that defines a return function trace.
660 struct ftrace_graph_ret {
661 unsigned long func; /* Current function */
662 unsigned long long calltime;
663 unsigned long long rettime;
664 /* Number of functions that overran the depth limit for current task */
665 unsigned long overrun;
669 /* Type of the callback handlers for tracing function graph*/
670 typedef void (*trace_func_graph_ret_t)(struct ftrace_graph_ret *); /* return */
671 typedef int (*trace_func_graph_ent_t)(struct ftrace_graph_ent *); /* entry */
673 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
676 #define INIT_FTRACE_GRAPH .ret_stack = NULL,
679 * Stack of return addresses for functions
681 * Used in struct thread_info
683 struct ftrace_ret_stack {
686 unsigned long long calltime;
687 unsigned long long subtime;
692 * Primary handler of a function return.
693 * It relays on ftrace_return_to_handler.
694 * Defined in entry_32/64.S
696 extern void return_to_handler(void);
699 ftrace_push_return_trace(unsigned long ret, unsigned long func, int *depth,
700 unsigned long frame_pointer);
703 * Sometimes we don't want to trace a function with the function
704 * graph tracer but we want them to keep traced by the usual function
705 * tracer if the function graph tracer is not configured.
707 #define __notrace_funcgraph notrace
710 * We want to which function is an entrypoint of a hardirq.
711 * That will help us to put a signal on output.
713 #define __irq_entry __attribute__((__section__(".irqentry.text")))
715 /* Limits of hardirq entrypoints */
716 extern char __irqentry_text_start[];
717 extern char __irqentry_text_end[];
719 #define FTRACE_RETFUNC_DEPTH 50
720 #define FTRACE_RETSTACK_ALLOC_SIZE 32
721 extern int register_ftrace_graph(trace_func_graph_ret_t retfunc,
722 trace_func_graph_ent_t entryfunc);
724 extern void ftrace_graph_stop(void);
726 /* The current handlers in use */
727 extern trace_func_graph_ret_t ftrace_graph_return;
728 extern trace_func_graph_ent_t ftrace_graph_entry;
730 extern void unregister_ftrace_graph(void);
732 extern void ftrace_graph_init_task(struct task_struct *t);
733 extern void ftrace_graph_exit_task(struct task_struct *t);
734 extern void ftrace_graph_init_idle_task(struct task_struct *t, int cpu);
736 static inline int task_curr_ret_stack(struct task_struct *t)
738 return t->curr_ret_stack;
741 static inline void pause_graph_tracing(void)
743 atomic_inc(¤t->tracing_graph_pause);
746 static inline void unpause_graph_tracing(void)
748 atomic_dec(¤t->tracing_graph_pause);
750 #else /* !CONFIG_FUNCTION_GRAPH_TRACER */
752 #define __notrace_funcgraph
754 #define INIT_FTRACE_GRAPH
756 static inline void ftrace_graph_init_task(struct task_struct *t) { }
757 static inline void ftrace_graph_exit_task(struct task_struct *t) { }
758 static inline void ftrace_graph_init_idle_task(struct task_struct *t, int cpu) { }
760 static inline int register_ftrace_graph(trace_func_graph_ret_t retfunc,
761 trace_func_graph_ent_t entryfunc)
765 static inline void unregister_ftrace_graph(void) { }
767 static inline int task_curr_ret_stack(struct task_struct *tsk)
772 static inline void pause_graph_tracing(void) { }
773 static inline void unpause_graph_tracing(void) { }
774 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
776 #ifdef CONFIG_TRACING
778 /* flags for current->trace */
780 TSK_TRACE_FL_TRACE_BIT = 0,
781 TSK_TRACE_FL_GRAPH_BIT = 1,
784 TSK_TRACE_FL_TRACE = 1 << TSK_TRACE_FL_TRACE_BIT,
785 TSK_TRACE_FL_GRAPH = 1 << TSK_TRACE_FL_GRAPH_BIT,
788 static inline void set_tsk_trace_trace(struct task_struct *tsk)
790 set_bit(TSK_TRACE_FL_TRACE_BIT, &tsk->trace);
793 static inline void clear_tsk_trace_trace(struct task_struct *tsk)
795 clear_bit(TSK_TRACE_FL_TRACE_BIT, &tsk->trace);
798 static inline int test_tsk_trace_trace(struct task_struct *tsk)
800 return tsk->trace & TSK_TRACE_FL_TRACE;
803 static inline void set_tsk_trace_graph(struct task_struct *tsk)
805 set_bit(TSK_TRACE_FL_GRAPH_BIT, &tsk->trace);
808 static inline void clear_tsk_trace_graph(struct task_struct *tsk)
810 clear_bit(TSK_TRACE_FL_GRAPH_BIT, &tsk->trace);
813 static inline int test_tsk_trace_graph(struct task_struct *tsk)
815 return tsk->trace & TSK_TRACE_FL_GRAPH;
818 enum ftrace_dump_mode;
820 extern enum ftrace_dump_mode ftrace_dump_on_oops;
822 #ifdef CONFIG_PREEMPT
823 #define INIT_TRACE_RECURSION .trace_recursion = 0,
826 #endif /* CONFIG_TRACING */
828 #ifndef INIT_TRACE_RECURSION
829 #define INIT_TRACE_RECURSION
832 #ifdef CONFIG_FTRACE_SYSCALLS
834 unsigned long arch_syscall_addr(int nr);
836 #endif /* CONFIG_FTRACE_SYSCALLS */
838 #endif /* _LINUX_FTRACE_H */