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.
90 FTRACE_OPS_FL_ENABLED = 1 << 0,
91 FTRACE_OPS_FL_GLOBAL = 1 << 1,
92 FTRACE_OPS_FL_DYNAMIC = 1 << 2,
93 FTRACE_OPS_FL_CONTROL = 1 << 3,
94 FTRACE_OPS_FL_SAVE_REGS = 1 << 4,
95 FTRACE_OPS_FL_SAVE_REGS_IF_SUPPORTED = 1 << 5,
100 struct ftrace_ops *next;
102 int __percpu *disabled;
103 #ifdef CONFIG_DYNAMIC_FTRACE
104 struct ftrace_hash *notrace_hash;
105 struct ftrace_hash *filter_hash;
109 extern int function_trace_stop;
112 * Type of the current tracing.
114 enum ftrace_tracing_type_t {
115 FTRACE_TYPE_ENTER = 0, /* Hook the call of the function */
116 FTRACE_TYPE_RETURN, /* Hook the return of the function */
119 /* Current tracing type, default is FTRACE_TYPE_ENTER */
120 extern enum ftrace_tracing_type_t ftrace_tracing_type;
123 * ftrace_stop - stop function tracer.
125 * A quick way to stop the function tracer. Note this an on off switch,
126 * it is not something that is recursive like preempt_disable.
127 * This does not disable the calling of mcount, it only stops the
128 * calling of functions from mcount.
130 static inline void ftrace_stop(void)
132 function_trace_stop = 1;
136 * ftrace_start - start the function tracer.
138 * This function is the inverse of ftrace_stop. This does not enable
139 * the function tracing if the function tracer is disabled. This only
140 * sets the function tracer flag to continue calling the functions
143 static inline void ftrace_start(void)
145 function_trace_stop = 0;
149 * The ftrace_ops must be a static and should also
150 * be read_mostly. These functions do modify read_mostly variables
151 * so use them sparely. Never free an ftrace_op or modify the
152 * next pointer after it has been registered. Even after unregistering
153 * it, the next pointer may still be used internally.
155 int register_ftrace_function(struct ftrace_ops *ops);
156 int unregister_ftrace_function(struct ftrace_ops *ops);
157 void clear_ftrace_function(void);
160 * ftrace_function_local_enable - enable controlled ftrace_ops on current cpu
162 * This function enables tracing on current cpu by decreasing
163 * the per cpu control variable.
164 * It must be called with preemption disabled and only on ftrace_ops
165 * registered with FTRACE_OPS_FL_CONTROL. If called without preemption
166 * disabled, this_cpu_ptr will complain when CONFIG_DEBUG_PREEMPT is enabled.
168 static inline void ftrace_function_local_enable(struct ftrace_ops *ops)
170 if (WARN_ON_ONCE(!(ops->flags & FTRACE_OPS_FL_CONTROL)))
173 (*this_cpu_ptr(ops->disabled))--;
177 * ftrace_function_local_disable - enable controlled ftrace_ops on current cpu
179 * This function enables tracing on current cpu by decreasing
180 * the per cpu control variable.
181 * It must be called with preemption disabled and only on ftrace_ops
182 * registered with FTRACE_OPS_FL_CONTROL. If called without preemption
183 * disabled, this_cpu_ptr will complain when CONFIG_DEBUG_PREEMPT is enabled.
185 static inline void ftrace_function_local_disable(struct ftrace_ops *ops)
187 if (WARN_ON_ONCE(!(ops->flags & FTRACE_OPS_FL_CONTROL)))
190 (*this_cpu_ptr(ops->disabled))++;
194 * ftrace_function_local_disabled - returns ftrace_ops disabled value
197 * This function returns value of ftrace_ops::disabled on current cpu.
198 * It must be called with preemption disabled and only on ftrace_ops
199 * registered with FTRACE_OPS_FL_CONTROL. If called without preemption
200 * disabled, this_cpu_ptr will complain when CONFIG_DEBUG_PREEMPT is enabled.
202 static inline int ftrace_function_local_disabled(struct ftrace_ops *ops)
204 WARN_ON_ONCE(!(ops->flags & FTRACE_OPS_FL_CONTROL));
205 return *this_cpu_ptr(ops->disabled);
208 extern void ftrace_stub(unsigned long a0, unsigned long a1,
209 struct ftrace_ops *op, struct pt_regs *regs);
211 #else /* !CONFIG_FUNCTION_TRACER */
213 * (un)register_ftrace_function must be a macro since the ops parameter
214 * must not be evaluated.
216 #define register_ftrace_function(ops) ({ 0; })
217 #define unregister_ftrace_function(ops) ({ 0; })
218 static inline void clear_ftrace_function(void) { }
219 static inline void ftrace_kill(void) { }
220 static inline void ftrace_stop(void) { }
221 static inline void ftrace_start(void) { }
222 #endif /* CONFIG_FUNCTION_TRACER */
224 #ifdef CONFIG_STACK_TRACER
225 extern int stack_tracer_enabled;
227 stack_trace_sysctl(struct ctl_table *table, int write,
228 void __user *buffer, size_t *lenp,
232 struct ftrace_func_command {
233 struct list_head list;
235 int (*func)(struct ftrace_hash *hash,
236 char *func, char *cmd,
237 char *params, int enable);
240 #ifdef CONFIG_DYNAMIC_FTRACE
242 int ftrace_arch_code_modify_prepare(void);
243 int ftrace_arch_code_modify_post_process(void);
245 void ftrace_bug(int err, unsigned long ip);
249 struct ftrace_probe_ops {
250 void (*func)(unsigned long ip,
251 unsigned long parent_ip,
253 int (*callback)(unsigned long ip, void **data);
254 void (*free)(void **data);
255 int (*print)(struct seq_file *m,
257 struct ftrace_probe_ops *ops,
262 register_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops,
265 unregister_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops,
268 unregister_ftrace_function_probe_func(char *glob, struct ftrace_probe_ops *ops);
269 extern void unregister_ftrace_function_probe_all(char *glob);
271 extern int ftrace_text_reserved(void *start, void *end);
274 * The dyn_ftrace record's flags field is split into two parts.
275 * the first part which is '0-FTRACE_REF_MAX' is a counter of
276 * the number of callbacks that have registered the function that
277 * the dyn_ftrace descriptor represents.
279 * The second part is a mask:
280 * ENABLED - the function is being traced
281 * REGS - the record wants the function to save regs
282 * REGS_EN - the function is set up to save regs.
284 * When a new ftrace_ops is registered and wants a function to save
285 * pt_regs, the rec->flag REGS is set. When the function has been
286 * set up to save regs, the REG_EN flag is set. Once a function
287 * starts saving regs it will do so until all ftrace_ops are removed
288 * from tracing that function.
291 FTRACE_FL_ENABLED = (1UL << 29),
292 FTRACE_FL_REGS = (1UL << 30),
293 FTRACE_FL_REGS_EN = (1UL << 31)
296 #define FTRACE_FL_MASK (0x7UL << 29)
297 #define FTRACE_REF_MAX ((1UL << 29) - 1)
301 unsigned long ip; /* address of mcount call-site */
302 struct dyn_ftrace *freelist;
305 struct dyn_arch_ftrace arch;
308 int ftrace_force_update(void);
309 int ftrace_set_filter(struct ftrace_ops *ops, unsigned char *buf,
311 int ftrace_set_notrace(struct ftrace_ops *ops, unsigned char *buf,
313 void ftrace_set_global_filter(unsigned char *buf, int len, int reset);
314 void ftrace_set_global_notrace(unsigned char *buf, int len, int reset);
315 void ftrace_free_filter(struct ftrace_ops *ops);
317 int register_ftrace_command(struct ftrace_func_command *cmd);
318 int unregister_ftrace_command(struct ftrace_func_command *cmd);
321 FTRACE_UPDATE_CALLS = (1 << 0),
322 FTRACE_DISABLE_CALLS = (1 << 1),
323 FTRACE_UPDATE_TRACE_FUNC = (1 << 2),
324 FTRACE_START_FUNC_RET = (1 << 3),
325 FTRACE_STOP_FUNC_RET = (1 << 4),
329 * The FTRACE_UPDATE_* enum is used to pass information back
330 * from the ftrace_update_record() and ftrace_test_record()
331 * functions. These are called by the code update routines
332 * to find out what is to be done for a given function.
334 * IGNORE - The function is already what we want it to be
335 * MAKE_CALL - Start tracing the function
336 * MODIFY_CALL - Stop saving regs for the function
337 * MODIFY_CALL_REGS - Start saving regs for the function
338 * MAKE_NOP - Stop tracing the function
341 FTRACE_UPDATE_IGNORE,
342 FTRACE_UPDATE_MAKE_CALL,
343 FTRACE_UPDATE_MODIFY_CALL,
344 FTRACE_UPDATE_MODIFY_CALL_REGS,
345 FTRACE_UPDATE_MAKE_NOP,
349 FTRACE_ITER_FILTER = (1 << 0),
350 FTRACE_ITER_NOTRACE = (1 << 1),
351 FTRACE_ITER_PRINTALL = (1 << 2),
352 FTRACE_ITER_DO_HASH = (1 << 3),
353 FTRACE_ITER_HASH = (1 << 4),
354 FTRACE_ITER_ENABLED = (1 << 5),
357 void arch_ftrace_update_code(int command);
359 struct ftrace_rec_iter;
361 struct ftrace_rec_iter *ftrace_rec_iter_start(void);
362 struct ftrace_rec_iter *ftrace_rec_iter_next(struct ftrace_rec_iter *iter);
363 struct dyn_ftrace *ftrace_rec_iter_record(struct ftrace_rec_iter *iter);
365 #define for_ftrace_rec_iter(iter) \
366 for (iter = ftrace_rec_iter_start(); \
368 iter = ftrace_rec_iter_next(iter))
371 int ftrace_update_record(struct dyn_ftrace *rec, int enable);
372 int ftrace_test_record(struct dyn_ftrace *rec, int enable);
373 void ftrace_run_stop_machine(int command);
374 unsigned long ftrace_location(unsigned long ip);
376 extern ftrace_func_t ftrace_trace_function;
378 int ftrace_regex_open(struct ftrace_ops *ops, int flag,
379 struct inode *inode, struct file *file);
380 ssize_t ftrace_filter_write(struct file *file, const char __user *ubuf,
381 size_t cnt, loff_t *ppos);
382 ssize_t ftrace_notrace_write(struct file *file, const char __user *ubuf,
383 size_t cnt, loff_t *ppos);
384 loff_t ftrace_regex_lseek(struct file *file, loff_t offset, int origin);
385 int ftrace_regex_release(struct inode *inode, struct file *file);
388 ftrace_set_early_filter(struct ftrace_ops *ops, char *buf, int enable);
390 /* defined in arch */
391 extern int ftrace_ip_converted(unsigned long ip);
392 extern int ftrace_dyn_arch_init(void *data);
393 extern void ftrace_replace_code(int enable);
394 extern int ftrace_update_ftrace_func(ftrace_func_t func);
395 extern void ftrace_caller(void);
396 extern void ftrace_regs_caller(void);
397 extern void ftrace_call(void);
398 extern void ftrace_regs_call(void);
399 extern void mcount_call(void);
401 void ftrace_modify_all_code(int command);
404 #define FTRACE_ADDR ((unsigned long)ftrace_caller)
407 #ifndef FTRACE_REGS_ADDR
408 #ifdef ARCH_SUPPORTS_FTRACE_SAVE_REGS
409 # define FTRACE_REGS_ADDR ((unsigned long)ftrace_regs_caller)
411 # define FTRACE_REGS_ADDR FTRACE_ADDR
415 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
416 extern void ftrace_graph_caller(void);
417 extern int ftrace_enable_ftrace_graph_caller(void);
418 extern int ftrace_disable_ftrace_graph_caller(void);
420 static inline int ftrace_enable_ftrace_graph_caller(void) { return 0; }
421 static inline int ftrace_disable_ftrace_graph_caller(void) { return 0; }
425 * ftrace_make_nop - convert code into nop
426 * @mod: module structure if called by module load initialization
427 * @rec: the mcount call site record
428 * @addr: the address that the call site should be calling
430 * This is a very sensitive operation and great care needs
431 * to be taken by the arch. The operation should carefully
432 * read the location, check to see if what is read is indeed
433 * what we expect it to be, and then on success of the compare,
434 * it should write to the location.
436 * The code segment at @rec->ip should be a caller to @addr
440 * -EFAULT on error reading the location
441 * -EINVAL on a failed compare of the contents
442 * -EPERM on error writing to the location
443 * Any other value will be considered a failure.
445 extern int ftrace_make_nop(struct module *mod,
446 struct dyn_ftrace *rec, unsigned long addr);
449 * ftrace_make_call - convert a nop call site into a call to addr
450 * @rec: the mcount call site record
451 * @addr: the address that the call site should call
453 * This is a very sensitive operation and great care needs
454 * to be taken by the arch. The operation should carefully
455 * read the location, check to see if what is read is indeed
456 * what we expect it to be, and then on success of the compare,
457 * it should write to the location.
459 * The code segment at @rec->ip should be a nop
463 * -EFAULT on error reading the location
464 * -EINVAL on a failed compare of the contents
465 * -EPERM on error writing to the location
466 * Any other value will be considered a failure.
468 extern int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr);
470 #ifdef ARCH_SUPPORTS_FTRACE_SAVE_REGS
472 * ftrace_modify_call - convert from one addr to another (no nop)
473 * @rec: the mcount call site record
474 * @old_addr: the address expected to be currently called to
475 * @addr: the address to change to
477 * This is a very sensitive operation and great care needs
478 * to be taken by the arch. The operation should carefully
479 * read the location, check to see if what is read is indeed
480 * what we expect it to be, and then on success of the compare,
481 * it should write to the location.
483 * The code segment at @rec->ip should be a caller to @old_addr
487 * -EFAULT on error reading the location
488 * -EINVAL on a failed compare of the contents
489 * -EPERM on error writing to the location
490 * Any other value will be considered a failure.
492 extern int ftrace_modify_call(struct dyn_ftrace *rec, unsigned long old_addr,
495 /* Should never be called */
496 static inline int ftrace_modify_call(struct dyn_ftrace *rec, unsigned long old_addr,
503 /* May be defined in arch */
504 extern int ftrace_arch_read_dyn_info(char *buf, int size);
506 extern int skip_trace(unsigned long ip);
508 extern void ftrace_disable_daemon(void);
509 extern void ftrace_enable_daemon(void);
511 static inline int skip_trace(unsigned long ip) { return 0; }
512 static inline int ftrace_force_update(void) { return 0; }
513 static inline void ftrace_disable_daemon(void) { }
514 static inline void ftrace_enable_daemon(void) { }
515 static inline void ftrace_release_mod(struct module *mod) {}
516 static inline int register_ftrace_command(struct ftrace_func_command *cmd)
520 static inline int unregister_ftrace_command(char *cmd_name)
524 static inline int ftrace_text_reserved(void *start, void *end)
530 * Again users of functions that have ftrace_ops may not
531 * have them defined when ftrace is not enabled, but these
532 * functions may still be called. Use a macro instead of inline.
534 #define ftrace_regex_open(ops, flag, inod, file) ({ -ENODEV; })
535 #define ftrace_set_early_filter(ops, buf, enable) do { } while (0)
536 #define ftrace_set_filter(ops, buf, len, reset) ({ -ENODEV; })
537 #define ftrace_set_notrace(ops, buf, len, reset) ({ -ENODEV; })
538 #define ftrace_free_filter(ops) do { } while (0)
540 static inline ssize_t ftrace_filter_write(struct file *file, const char __user *ubuf,
541 size_t cnt, loff_t *ppos) { return -ENODEV; }
542 static inline ssize_t ftrace_notrace_write(struct file *file, const char __user *ubuf,
543 size_t cnt, loff_t *ppos) { return -ENODEV; }
544 static inline loff_t ftrace_regex_lseek(struct file *file, loff_t offset, int origin)
549 ftrace_regex_release(struct inode *inode, struct file *file) { return -ENODEV; }
550 #endif /* CONFIG_DYNAMIC_FTRACE */
552 /* totally disable ftrace - can not re-enable after this */
553 void ftrace_kill(void);
555 static inline void tracer_disable(void)
557 #ifdef CONFIG_FUNCTION_TRACER
563 * Ftrace disable/restore without lock. Some synchronization mechanism
564 * must be used to prevent ftrace_enabled to be changed between
567 static inline int __ftrace_enabled_save(void)
569 #ifdef CONFIG_FUNCTION_TRACER
570 int saved_ftrace_enabled = ftrace_enabled;
572 return saved_ftrace_enabled;
578 static inline void __ftrace_enabled_restore(int enabled)
580 #ifdef CONFIG_FUNCTION_TRACER
581 ftrace_enabled = enabled;
585 #ifndef HAVE_ARCH_CALLER_ADDR
586 # ifdef CONFIG_FRAME_POINTER
587 # define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0))
588 # define CALLER_ADDR1 ((unsigned long)__builtin_return_address(1))
589 # define CALLER_ADDR2 ((unsigned long)__builtin_return_address(2))
590 # define CALLER_ADDR3 ((unsigned long)__builtin_return_address(3))
591 # define CALLER_ADDR4 ((unsigned long)__builtin_return_address(4))
592 # define CALLER_ADDR5 ((unsigned long)__builtin_return_address(5))
593 # define CALLER_ADDR6 ((unsigned long)__builtin_return_address(6))
595 # define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0))
596 # define CALLER_ADDR1 0UL
597 # define CALLER_ADDR2 0UL
598 # define CALLER_ADDR3 0UL
599 # define CALLER_ADDR4 0UL
600 # define CALLER_ADDR5 0UL
601 # define CALLER_ADDR6 0UL
603 #endif /* ifndef HAVE_ARCH_CALLER_ADDR */
605 #ifdef CONFIG_IRQSOFF_TRACER
606 extern void time_hardirqs_on(unsigned long a0, unsigned long a1);
607 extern void time_hardirqs_off(unsigned long a0, unsigned long a1);
609 static inline void time_hardirqs_on(unsigned long a0, unsigned long a1) { }
610 static inline void time_hardirqs_off(unsigned long a0, unsigned long a1) { }
613 #ifdef CONFIG_PREEMPT_TRACER
614 extern void trace_preempt_on(unsigned long a0, unsigned long a1);
615 extern void trace_preempt_off(unsigned long a0, unsigned long a1);
618 * Use defines instead of static inlines because some arches will make code out
619 * of the CALLER_ADDR, when we really want these to be a real nop.
621 # define trace_preempt_on(a0, a1) do { } while (0)
622 # define trace_preempt_off(a0, a1) do { } while (0)
625 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
626 extern void ftrace_init(void);
628 static inline void ftrace_init(void) { }
632 * Structure that defines an entry function trace.
634 struct ftrace_graph_ent {
635 unsigned long func; /* Current function */
640 * Structure that defines a return function trace.
642 struct ftrace_graph_ret {
643 unsigned long func; /* Current function */
644 unsigned long long calltime;
645 unsigned long long rettime;
646 /* Number of functions that overran the depth limit for current task */
647 unsigned long overrun;
651 /* Type of the callback handlers for tracing function graph*/
652 typedef void (*trace_func_graph_ret_t)(struct ftrace_graph_ret *); /* return */
653 typedef int (*trace_func_graph_ent_t)(struct ftrace_graph_ent *); /* entry */
655 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
658 #define INIT_FTRACE_GRAPH .ret_stack = NULL,
661 * Stack of return addresses for functions
663 * Used in struct thread_info
665 struct ftrace_ret_stack {
668 unsigned long long calltime;
669 unsigned long long subtime;
674 * Primary handler of a function return.
675 * It relays on ftrace_return_to_handler.
676 * Defined in entry_32/64.S
678 extern void return_to_handler(void);
681 ftrace_push_return_trace(unsigned long ret, unsigned long func, int *depth,
682 unsigned long frame_pointer);
685 * Sometimes we don't want to trace a function with the function
686 * graph tracer but we want them to keep traced by the usual function
687 * tracer if the function graph tracer is not configured.
689 #define __notrace_funcgraph notrace
692 * We want to which function is an entrypoint of a hardirq.
693 * That will help us to put a signal on output.
695 #define __irq_entry __attribute__((__section__(".irqentry.text")))
697 /* Limits of hardirq entrypoints */
698 extern char __irqentry_text_start[];
699 extern char __irqentry_text_end[];
701 #define FTRACE_RETFUNC_DEPTH 50
702 #define FTRACE_RETSTACK_ALLOC_SIZE 32
703 extern int register_ftrace_graph(trace_func_graph_ret_t retfunc,
704 trace_func_graph_ent_t entryfunc);
706 extern void ftrace_graph_stop(void);
708 /* The current handlers in use */
709 extern trace_func_graph_ret_t ftrace_graph_return;
710 extern trace_func_graph_ent_t ftrace_graph_entry;
712 extern void unregister_ftrace_graph(void);
714 extern void ftrace_graph_init_task(struct task_struct *t);
715 extern void ftrace_graph_exit_task(struct task_struct *t);
716 extern void ftrace_graph_init_idle_task(struct task_struct *t, int cpu);
718 static inline int task_curr_ret_stack(struct task_struct *t)
720 return t->curr_ret_stack;
723 static inline void pause_graph_tracing(void)
725 atomic_inc(¤t->tracing_graph_pause);
728 static inline void unpause_graph_tracing(void)
730 atomic_dec(¤t->tracing_graph_pause);
732 #else /* !CONFIG_FUNCTION_GRAPH_TRACER */
734 #define __notrace_funcgraph
736 #define INIT_FTRACE_GRAPH
738 static inline void ftrace_graph_init_task(struct task_struct *t) { }
739 static inline void ftrace_graph_exit_task(struct task_struct *t) { }
740 static inline void ftrace_graph_init_idle_task(struct task_struct *t, int cpu) { }
742 static inline int register_ftrace_graph(trace_func_graph_ret_t retfunc,
743 trace_func_graph_ent_t entryfunc)
747 static inline void unregister_ftrace_graph(void) { }
749 static inline int task_curr_ret_stack(struct task_struct *tsk)
754 static inline void pause_graph_tracing(void) { }
755 static inline void unpause_graph_tracing(void) { }
756 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
758 #ifdef CONFIG_TRACING
760 /* flags for current->trace */
762 TSK_TRACE_FL_TRACE_BIT = 0,
763 TSK_TRACE_FL_GRAPH_BIT = 1,
766 TSK_TRACE_FL_TRACE = 1 << TSK_TRACE_FL_TRACE_BIT,
767 TSK_TRACE_FL_GRAPH = 1 << TSK_TRACE_FL_GRAPH_BIT,
770 static inline void set_tsk_trace_trace(struct task_struct *tsk)
772 set_bit(TSK_TRACE_FL_TRACE_BIT, &tsk->trace);
775 static inline void clear_tsk_trace_trace(struct task_struct *tsk)
777 clear_bit(TSK_TRACE_FL_TRACE_BIT, &tsk->trace);
780 static inline int test_tsk_trace_trace(struct task_struct *tsk)
782 return tsk->trace & TSK_TRACE_FL_TRACE;
785 static inline void set_tsk_trace_graph(struct task_struct *tsk)
787 set_bit(TSK_TRACE_FL_GRAPH_BIT, &tsk->trace);
790 static inline void clear_tsk_trace_graph(struct task_struct *tsk)
792 clear_bit(TSK_TRACE_FL_GRAPH_BIT, &tsk->trace);
795 static inline int test_tsk_trace_graph(struct task_struct *tsk)
797 return tsk->trace & TSK_TRACE_FL_GRAPH;
800 enum ftrace_dump_mode;
802 extern enum ftrace_dump_mode ftrace_dump_on_oops;
804 #ifdef CONFIG_PREEMPT
805 #define INIT_TRACE_RECURSION .trace_recursion = 0,
808 #endif /* CONFIG_TRACING */
810 #ifndef INIT_TRACE_RECURSION
811 #define INIT_TRACE_RECURSION
814 #ifdef CONFIG_FTRACE_SYSCALLS
816 unsigned long arch_syscall_addr(int nr);
818 #endif /* CONFIG_FTRACE_SYSCALLS */
820 #endif /* _LINUX_FTRACE_H */