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
46 #ifdef CONFIG_FUNCTION_TRACER
48 extern int ftrace_enabled;
50 ftrace_enable_sysctl(struct ctl_table *table, int write,
51 void __user *buffer, size_t *lenp,
56 typedef void (*ftrace_func_t)(unsigned long ip, unsigned long parent_ip,
57 struct ftrace_ops *op, struct pt_regs *regs);
59 ftrace_func_t ftrace_ops_get_func(struct ftrace_ops *ops);
62 * FTRACE_OPS_FL_* bits denote the state of ftrace_ops struct and are
63 * set in the flags member.
65 * ENABLED - set/unset when ftrace_ops is registered/unregistered
66 * DYNAMIC - set when ftrace_ops is registered to denote dynamically
67 * allocated ftrace_ops which need special care
68 * CONTROL - set manualy by ftrace_ops user to denote the ftrace_ops
69 * could be controled by following calls:
70 * ftrace_function_local_enable
71 * ftrace_function_local_disable
72 * SAVE_REGS - The ftrace_ops wants regs saved at each function called
73 * and passed to the callback. If this flag is set, but the
74 * architecture does not support passing regs
75 * (CONFIG_DYNAMIC_FTRACE_WITH_REGS is not defined), then the
76 * ftrace_ops will fail to register, unless the next flag
78 * SAVE_REGS_IF_SUPPORTED - This is the same as SAVE_REGS, but if the
79 * handler can handle an arch that does not save regs
80 * (the handler tests if regs == NULL), then it can set
81 * this flag instead. It will not fail registering the ftrace_ops
82 * but, the regs field will be NULL if the arch does not support
83 * passing regs to the handler.
84 * Note, if this flag is set, the SAVE_REGS flag will automatically
85 * get set upon registering the ftrace_ops, if the arch supports it.
86 * RECURSION_SAFE - The ftrace_ops can set this to tell the ftrace infrastructure
87 * that the call back has its own recursion protection. If it does
88 * not set this, then the ftrace infrastructure will add recursion
89 * protection for the caller.
90 * STUB - The ftrace_ops is just a place holder.
91 * INITIALIZED - The ftrace_ops has already been initialized (first use time
92 * register_ftrace_function() is called, it will initialized the ops)
93 * DELETED - The ops are being deleted, do not let them be registered again.
94 * ADDING - The ops is in the process of being added.
95 * REMOVING - The ops is in the process of being removed.
96 * MODIFYING - The ops is in the process of changing its filter functions.
97 * ALLOC_TRAMP - A dynamic trampoline was allocated by the core code.
98 * The arch specific code sets this flag when it allocated a
99 * trampoline. This lets the arch know that it can update the
100 * trampoline in case the callback function changes.
101 * The ftrace_ops trampoline can be set by the ftrace users, and
102 * in such cases the arch must not modify it. Only the arch ftrace
103 * core code should set this flag.
106 FTRACE_OPS_FL_ENABLED = 1 << 0,
107 FTRACE_OPS_FL_DYNAMIC = 1 << 1,
108 FTRACE_OPS_FL_CONTROL = 1 << 2,
109 FTRACE_OPS_FL_SAVE_REGS = 1 << 3,
110 FTRACE_OPS_FL_SAVE_REGS_IF_SUPPORTED = 1 << 4,
111 FTRACE_OPS_FL_RECURSION_SAFE = 1 << 5,
112 FTRACE_OPS_FL_STUB = 1 << 6,
113 FTRACE_OPS_FL_INITIALIZED = 1 << 7,
114 FTRACE_OPS_FL_DELETED = 1 << 8,
115 FTRACE_OPS_FL_ADDING = 1 << 9,
116 FTRACE_OPS_FL_REMOVING = 1 << 10,
117 FTRACE_OPS_FL_MODIFYING = 1 << 11,
118 FTRACE_OPS_FL_ALLOC_TRAMP = 1 << 12,
121 #ifdef CONFIG_DYNAMIC_FTRACE
122 /* The hash used to know what functions callbacks trace */
123 struct ftrace_ops_hash {
124 struct ftrace_hash *notrace_hash;
125 struct ftrace_hash *filter_hash;
126 struct mutex regex_lock;
131 * Note, ftrace_ops can be referenced outside of RCU protection.
132 * (Although, for perf, the control ops prevent that). If ftrace_ops is
133 * allocated and not part of kernel core data, the unregistering of it will
134 * perform a scheduling on all CPUs to make sure that there are no more users.
135 * Depending on the load of the system that may take a bit of time.
137 * Any private data added must also take care not to be freed and if private
138 * data is added to a ftrace_ops that is in core code, the user of the
139 * ftrace_ops must perform a schedule_on_each_cpu() before freeing it.
143 struct ftrace_ops *next;
146 int __percpu *disabled;
147 #ifdef CONFIG_DYNAMIC_FTRACE
149 struct ftrace_ops_hash local_hash;
150 struct ftrace_ops_hash *func_hash;
151 struct ftrace_ops_hash old_hash;
152 unsigned long trampoline;
157 * Type of the current tracing.
159 enum ftrace_tracing_type_t {
160 FTRACE_TYPE_ENTER = 0, /* Hook the call of the function */
161 FTRACE_TYPE_RETURN, /* Hook the return of the function */
164 /* Current tracing type, default is FTRACE_TYPE_ENTER */
165 extern enum ftrace_tracing_type_t ftrace_tracing_type;
168 * The ftrace_ops must be a static and should also
169 * be read_mostly. These functions do modify read_mostly variables
170 * so use them sparely. Never free an ftrace_op or modify the
171 * next pointer after it has been registered. Even after unregistering
172 * it, the next pointer may still be used internally.
174 int register_ftrace_function(struct ftrace_ops *ops);
175 int unregister_ftrace_function(struct ftrace_ops *ops);
176 void clear_ftrace_function(void);
179 * ftrace_function_local_enable - enable controlled ftrace_ops on current cpu
181 * This function enables tracing on current cpu by decreasing
182 * the per cpu control variable.
183 * It must be called with preemption disabled and only on ftrace_ops
184 * registered with FTRACE_OPS_FL_CONTROL. If called without preemption
185 * disabled, this_cpu_ptr will complain when CONFIG_DEBUG_PREEMPT is enabled.
187 static inline void ftrace_function_local_enable(struct ftrace_ops *ops)
189 if (WARN_ON_ONCE(!(ops->flags & FTRACE_OPS_FL_CONTROL)))
192 (*this_cpu_ptr(ops->disabled))--;
196 * ftrace_function_local_disable - 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_disable(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_disabled - returns ftrace_ops disabled value
216 * This function returns value of ftrace_ops::disabled on current cpu.
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 int ftrace_function_local_disabled(struct ftrace_ops *ops)
223 WARN_ON_ONCE(!(ops->flags & FTRACE_OPS_FL_CONTROL));
224 return *this_cpu_ptr(ops->disabled);
227 extern void ftrace_stub(unsigned long a0, unsigned long a1,
228 struct ftrace_ops *op, struct pt_regs *regs);
230 #else /* !CONFIG_FUNCTION_TRACER */
232 * (un)register_ftrace_function must be a macro since the ops parameter
233 * must not be evaluated.
235 #define register_ftrace_function(ops) ({ 0; })
236 #define unregister_ftrace_function(ops) ({ 0; })
237 static inline int ftrace_nr_registered_ops(void)
241 static inline void clear_ftrace_function(void) { }
242 static inline void ftrace_kill(void) { }
243 #endif /* CONFIG_FUNCTION_TRACER */
245 #ifdef CONFIG_STACK_TRACER
246 extern int stack_tracer_enabled;
248 stack_trace_sysctl(struct ctl_table *table, int write,
249 void __user *buffer, size_t *lenp,
253 struct ftrace_func_command {
254 struct list_head list;
256 int (*func)(struct ftrace_hash *hash,
257 char *func, char *cmd,
258 char *params, int enable);
261 #ifdef CONFIG_DYNAMIC_FTRACE
263 int ftrace_arch_code_modify_prepare(void);
264 int ftrace_arch_code_modify_post_process(void);
266 void ftrace_bug(int err, unsigned long ip);
270 struct ftrace_probe_ops {
271 void (*func)(unsigned long ip,
272 unsigned long parent_ip,
274 int (*init)(struct ftrace_probe_ops *ops,
275 unsigned long ip, void **data);
276 void (*free)(struct ftrace_probe_ops *ops,
277 unsigned long ip, void **data);
278 int (*print)(struct seq_file *m,
280 struct ftrace_probe_ops *ops,
285 register_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops,
288 unregister_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops,
291 unregister_ftrace_function_probe_func(char *glob, struct ftrace_probe_ops *ops);
292 extern void unregister_ftrace_function_probe_all(char *glob);
294 extern int ftrace_text_reserved(const void *start, const void *end);
296 extern int ftrace_nr_registered_ops(void);
299 * The dyn_ftrace record's flags field is split into two parts.
300 * the first part which is '0-FTRACE_REF_MAX' is a counter of
301 * the number of callbacks that have registered the function that
302 * the dyn_ftrace descriptor represents.
304 * The second part is a mask:
305 * ENABLED - the function is being traced
306 * REGS - the record wants the function to save regs
307 * REGS_EN - the function is set up to save regs.
309 * When a new ftrace_ops is registered and wants a function to save
310 * pt_regs, the rec->flag REGS is set. When the function has been
311 * set up to save regs, the REG_EN flag is set. Once a function
312 * starts saving regs it will do so until all ftrace_ops are removed
313 * from tracing that function.
316 FTRACE_FL_ENABLED = (1UL << 31),
317 FTRACE_FL_REGS = (1UL << 30),
318 FTRACE_FL_REGS_EN = (1UL << 29),
319 FTRACE_FL_TRAMP = (1UL << 28),
320 FTRACE_FL_TRAMP_EN = (1UL << 27),
323 #define FTRACE_REF_MAX_SHIFT 27
324 #define FTRACE_FL_BITS 5
325 #define FTRACE_FL_MASKED_BITS ((1UL << FTRACE_FL_BITS) - 1)
326 #define FTRACE_FL_MASK (FTRACE_FL_MASKED_BITS << FTRACE_REF_MAX_SHIFT)
327 #define FTRACE_REF_MAX ((1UL << FTRACE_REF_MAX_SHIFT) - 1)
329 #define ftrace_rec_count(rec) ((rec)->flags & ~FTRACE_FL_MASK)
332 unsigned long ip; /* address of mcount call-site */
334 struct dyn_arch_ftrace arch;
337 int ftrace_force_update(void);
338 int ftrace_set_filter_ip(struct ftrace_ops *ops, unsigned long ip,
339 int remove, int reset);
340 int ftrace_set_filter(struct ftrace_ops *ops, unsigned char *buf,
342 int ftrace_set_notrace(struct ftrace_ops *ops, unsigned char *buf,
344 void ftrace_set_global_filter(unsigned char *buf, int len, int reset);
345 void ftrace_set_global_notrace(unsigned char *buf, int len, int reset);
346 void ftrace_free_filter(struct ftrace_ops *ops);
348 int register_ftrace_command(struct ftrace_func_command *cmd);
349 int unregister_ftrace_command(struct ftrace_func_command *cmd);
352 FTRACE_UPDATE_CALLS = (1 << 0),
353 FTRACE_DISABLE_CALLS = (1 << 1),
354 FTRACE_UPDATE_TRACE_FUNC = (1 << 2),
355 FTRACE_START_FUNC_RET = (1 << 3),
356 FTRACE_STOP_FUNC_RET = (1 << 4),
360 * The FTRACE_UPDATE_* enum is used to pass information back
361 * from the ftrace_update_record() and ftrace_test_record()
362 * functions. These are called by the code update routines
363 * to find out what is to be done for a given function.
365 * IGNORE - The function is already what we want it to be
366 * MAKE_CALL - Start tracing the function
367 * MODIFY_CALL - Stop saving regs for the function
368 * MAKE_NOP - Stop tracing the function
371 FTRACE_UPDATE_IGNORE,
372 FTRACE_UPDATE_MAKE_CALL,
373 FTRACE_UPDATE_MODIFY_CALL,
374 FTRACE_UPDATE_MAKE_NOP,
378 FTRACE_ITER_FILTER = (1 << 0),
379 FTRACE_ITER_NOTRACE = (1 << 1),
380 FTRACE_ITER_PRINTALL = (1 << 2),
381 FTRACE_ITER_DO_HASH = (1 << 3),
382 FTRACE_ITER_HASH = (1 << 4),
383 FTRACE_ITER_ENABLED = (1 << 5),
386 void arch_ftrace_update_code(int command);
388 struct ftrace_rec_iter;
390 struct ftrace_rec_iter *ftrace_rec_iter_start(void);
391 struct ftrace_rec_iter *ftrace_rec_iter_next(struct ftrace_rec_iter *iter);
392 struct dyn_ftrace *ftrace_rec_iter_record(struct ftrace_rec_iter *iter);
394 #define for_ftrace_rec_iter(iter) \
395 for (iter = ftrace_rec_iter_start(); \
397 iter = ftrace_rec_iter_next(iter))
400 int ftrace_update_record(struct dyn_ftrace *rec, int enable);
401 int ftrace_test_record(struct dyn_ftrace *rec, int enable);
402 void ftrace_run_stop_machine(int command);
403 unsigned long ftrace_location(unsigned long ip);
404 unsigned long ftrace_get_addr_new(struct dyn_ftrace *rec);
405 unsigned long ftrace_get_addr_curr(struct dyn_ftrace *rec);
407 extern ftrace_func_t ftrace_trace_function;
409 int ftrace_regex_open(struct ftrace_ops *ops, int flag,
410 struct inode *inode, struct file *file);
411 ssize_t ftrace_filter_write(struct file *file, const char __user *ubuf,
412 size_t cnt, loff_t *ppos);
413 ssize_t ftrace_notrace_write(struct file *file, const char __user *ubuf,
414 size_t cnt, loff_t *ppos);
415 int ftrace_regex_release(struct inode *inode, struct file *file);
418 ftrace_set_early_filter(struct ftrace_ops *ops, char *buf, int enable);
420 /* defined in arch */
421 extern int ftrace_ip_converted(unsigned long ip);
422 extern int ftrace_dyn_arch_init(void);
423 extern void ftrace_replace_code(int enable);
424 extern int ftrace_update_ftrace_func(ftrace_func_t func);
425 extern void ftrace_caller(void);
426 extern void ftrace_regs_caller(void);
427 extern void ftrace_call(void);
428 extern void ftrace_regs_call(void);
429 extern void mcount_call(void);
431 void ftrace_modify_all_code(int command);
434 #define FTRACE_ADDR ((unsigned long)ftrace_caller)
437 #ifndef FTRACE_GRAPH_ADDR
438 #define FTRACE_GRAPH_ADDR ((unsigned long)ftrace_graph_caller)
441 #ifndef FTRACE_REGS_ADDR
442 #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
443 # define FTRACE_REGS_ADDR ((unsigned long)ftrace_regs_caller)
445 # define FTRACE_REGS_ADDR FTRACE_ADDR
450 * If an arch would like functions that are only traced
451 * by the function graph tracer to jump directly to its own
452 * trampoline, then they can define FTRACE_GRAPH_TRAMP_ADDR
453 * to be that address to jump to.
455 #ifndef FTRACE_GRAPH_TRAMP_ADDR
456 #define FTRACE_GRAPH_TRAMP_ADDR ((unsigned long) 0)
459 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
460 extern void ftrace_graph_caller(void);
461 extern int ftrace_enable_ftrace_graph_caller(void);
462 extern int ftrace_disable_ftrace_graph_caller(void);
464 static inline int ftrace_enable_ftrace_graph_caller(void) { return 0; }
465 static inline int ftrace_disable_ftrace_graph_caller(void) { return 0; }
469 * ftrace_make_nop - convert code into nop
470 * @mod: module structure if called by module load initialization
471 * @rec: the mcount call site record
472 * @addr: the address that the call site should be calling
474 * This is a very sensitive operation and great care needs
475 * to be taken by the arch. The operation should carefully
476 * read the location, check to see if what is read is indeed
477 * what we expect it to be, and then on success of the compare,
478 * it should write to the location.
480 * The code segment at @rec->ip should be a caller to @addr
484 * -EFAULT on error reading the location
485 * -EINVAL on a failed compare of the contents
486 * -EPERM on error writing to the location
487 * Any other value will be considered a failure.
489 extern int ftrace_make_nop(struct module *mod,
490 struct dyn_ftrace *rec, unsigned long addr);
493 * ftrace_make_call - convert a nop call site into a call to addr
494 * @rec: the mcount call site record
495 * @addr: the address that the call site should call
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 nop
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_call(struct dyn_ftrace *rec, unsigned long addr);
514 #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
516 * ftrace_modify_call - convert from one addr to another (no nop)
517 * @rec: the mcount call site record
518 * @old_addr: the address expected to be currently called to
519 * @addr: the address to change to
521 * This is a very sensitive operation and great care needs
522 * to be taken by the arch. The operation should carefully
523 * read the location, check to see if what is read is indeed
524 * what we expect it to be, and then on success of the compare,
525 * it should write to the location.
527 * The code segment at @rec->ip should be a caller to @old_addr
531 * -EFAULT on error reading the location
532 * -EINVAL on a failed compare of the contents
533 * -EPERM on error writing to the location
534 * Any other value will be considered a failure.
536 extern int ftrace_modify_call(struct dyn_ftrace *rec, unsigned long old_addr,
539 /* Should never be called */
540 static inline int ftrace_modify_call(struct dyn_ftrace *rec, unsigned long old_addr,
547 /* May be defined in arch */
548 extern int ftrace_arch_read_dyn_info(char *buf, int size);
550 extern int skip_trace(unsigned long ip);
551 extern void ftrace_module_init(struct module *mod);
553 extern void ftrace_disable_daemon(void);
554 extern void ftrace_enable_daemon(void);
555 #else /* CONFIG_DYNAMIC_FTRACE */
556 static inline int skip_trace(unsigned long ip) { return 0; }
557 static inline int ftrace_force_update(void) { return 0; }
558 static inline void ftrace_disable_daemon(void) { }
559 static inline void ftrace_enable_daemon(void) { }
560 static inline void ftrace_release_mod(struct module *mod) {}
561 static inline void ftrace_module_init(struct module *mod) {}
562 static inline __init int register_ftrace_command(struct ftrace_func_command *cmd)
566 static inline __init int unregister_ftrace_command(char *cmd_name)
570 static inline int ftrace_text_reserved(const void *start, const void *end)
574 static inline unsigned long ftrace_location(unsigned long ip)
580 * Again users of functions that have ftrace_ops may not
581 * have them defined when ftrace is not enabled, but these
582 * functions may still be called. Use a macro instead of inline.
584 #define ftrace_regex_open(ops, flag, inod, file) ({ -ENODEV; })
585 #define ftrace_set_early_filter(ops, buf, enable) do { } while (0)
586 #define ftrace_set_filter_ip(ops, ip, remove, reset) ({ -ENODEV; })
587 #define ftrace_set_filter(ops, buf, len, reset) ({ -ENODEV; })
588 #define ftrace_set_notrace(ops, buf, len, reset) ({ -ENODEV; })
589 #define ftrace_free_filter(ops) do { } while (0)
591 static inline ssize_t ftrace_filter_write(struct file *file, const char __user *ubuf,
592 size_t cnt, loff_t *ppos) { return -ENODEV; }
593 static inline ssize_t ftrace_notrace_write(struct file *file, const char __user *ubuf,
594 size_t cnt, loff_t *ppos) { return -ENODEV; }
596 ftrace_regex_release(struct inode *inode, struct file *file) { return -ENODEV; }
597 #endif /* CONFIG_DYNAMIC_FTRACE */
599 /* totally disable ftrace - can not re-enable after this */
600 void ftrace_kill(void);
602 static inline void tracer_disable(void)
604 #ifdef CONFIG_FUNCTION_TRACER
610 * Ftrace disable/restore without lock. Some synchronization mechanism
611 * must be used to prevent ftrace_enabled to be changed between
614 static inline int __ftrace_enabled_save(void)
616 #ifdef CONFIG_FUNCTION_TRACER
617 int saved_ftrace_enabled = ftrace_enabled;
619 return saved_ftrace_enabled;
625 static inline void __ftrace_enabled_restore(int enabled)
627 #ifdef CONFIG_FUNCTION_TRACER
628 ftrace_enabled = enabled;
632 /* All archs should have this, but we define it for consistency */
633 #ifndef ftrace_return_address0
634 # define ftrace_return_address0 __builtin_return_address(0)
637 /* Archs may use other ways for ADDR1 and beyond */
638 #ifndef ftrace_return_address
639 # ifdef CONFIG_FRAME_POINTER
640 # define ftrace_return_address(n) __builtin_return_address(n)
642 # define ftrace_return_address(n) 0UL
646 #define CALLER_ADDR0 ((unsigned long)ftrace_return_address0)
647 #define CALLER_ADDR1 ((unsigned long)ftrace_return_address(1))
648 #define CALLER_ADDR2 ((unsigned long)ftrace_return_address(2))
649 #define CALLER_ADDR3 ((unsigned long)ftrace_return_address(3))
650 #define CALLER_ADDR4 ((unsigned long)ftrace_return_address(4))
651 #define CALLER_ADDR5 ((unsigned long)ftrace_return_address(5))
652 #define CALLER_ADDR6 ((unsigned long)ftrace_return_address(6))
654 #ifdef CONFIG_IRQSOFF_TRACER
655 extern void time_hardirqs_on(unsigned long a0, unsigned long a1);
656 extern void time_hardirqs_off(unsigned long a0, unsigned long a1);
658 static inline void time_hardirqs_on(unsigned long a0, unsigned long a1) { }
659 static inline void time_hardirqs_off(unsigned long a0, unsigned long a1) { }
662 #ifdef CONFIG_PREEMPT_TRACER
663 extern void trace_preempt_on(unsigned long a0, unsigned long a1);
664 extern void trace_preempt_off(unsigned long a0, unsigned long a1);
667 * Use defines instead of static inlines because some arches will make code out
668 * of the CALLER_ADDR, when we really want these to be a real nop.
670 # define trace_preempt_on(a0, a1) do { } while (0)
671 # define trace_preempt_off(a0, a1) do { } while (0)
674 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
675 extern void ftrace_init(void);
677 static inline void ftrace_init(void) { }
681 * Structure that defines an entry function trace.
683 struct ftrace_graph_ent {
684 unsigned long func; /* Current function */
689 * Structure that defines a return function trace.
691 struct ftrace_graph_ret {
692 unsigned long func; /* Current function */
693 unsigned long long calltime;
694 unsigned long long rettime;
695 /* Number of functions that overran the depth limit for current task */
696 unsigned long overrun;
700 /* Type of the callback handlers for tracing function graph*/
701 typedef void (*trace_func_graph_ret_t)(struct ftrace_graph_ret *); /* return */
702 typedef int (*trace_func_graph_ent_t)(struct ftrace_graph_ent *); /* entry */
704 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
707 #define INIT_FTRACE_GRAPH .ret_stack = NULL,
710 * Stack of return addresses for functions
712 * Used in struct thread_info
714 struct ftrace_ret_stack {
717 unsigned long long calltime;
718 unsigned long long subtime;
723 * Primary handler of a function return.
724 * It relays on ftrace_return_to_handler.
725 * Defined in entry_32/64.S
727 extern void return_to_handler(void);
730 ftrace_push_return_trace(unsigned long ret, unsigned long func, int *depth,
731 unsigned long frame_pointer);
734 * Sometimes we don't want to trace a function with the function
735 * graph tracer but we want them to keep traced by the usual function
736 * tracer if the function graph tracer is not configured.
738 #define __notrace_funcgraph notrace
741 * We want to which function is an entrypoint of a hardirq.
742 * That will help us to put a signal on output.
744 #define __irq_entry __attribute__((__section__(".irqentry.text")))
746 /* Limits of hardirq entrypoints */
747 extern char __irqentry_text_start[];
748 extern char __irqentry_text_end[];
750 #define FTRACE_NOTRACE_DEPTH 65536
751 #define FTRACE_RETFUNC_DEPTH 50
752 #define FTRACE_RETSTACK_ALLOC_SIZE 32
753 extern int register_ftrace_graph(trace_func_graph_ret_t retfunc,
754 trace_func_graph_ent_t entryfunc);
756 extern bool ftrace_graph_is_dead(void);
757 extern void ftrace_graph_stop(void);
759 /* The current handlers in use */
760 extern trace_func_graph_ret_t ftrace_graph_return;
761 extern trace_func_graph_ent_t ftrace_graph_entry;
763 extern void unregister_ftrace_graph(void);
765 extern void ftrace_graph_init_task(struct task_struct *t);
766 extern void ftrace_graph_exit_task(struct task_struct *t);
767 extern void ftrace_graph_init_idle_task(struct task_struct *t, int cpu);
769 static inline int task_curr_ret_stack(struct task_struct *t)
771 return t->curr_ret_stack;
774 static inline void pause_graph_tracing(void)
776 atomic_inc(¤t->tracing_graph_pause);
779 static inline void unpause_graph_tracing(void)
781 atomic_dec(¤t->tracing_graph_pause);
783 #else /* !CONFIG_FUNCTION_GRAPH_TRACER */
785 #define __notrace_funcgraph
787 #define INIT_FTRACE_GRAPH
789 static inline void ftrace_graph_init_task(struct task_struct *t) { }
790 static inline void ftrace_graph_exit_task(struct task_struct *t) { }
791 static inline void ftrace_graph_init_idle_task(struct task_struct *t, int cpu) { }
793 static inline int register_ftrace_graph(trace_func_graph_ret_t retfunc,
794 trace_func_graph_ent_t entryfunc)
798 static inline void unregister_ftrace_graph(void) { }
800 static inline int task_curr_ret_stack(struct task_struct *tsk)
805 static inline void pause_graph_tracing(void) { }
806 static inline void unpause_graph_tracing(void) { }
807 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
809 #ifdef CONFIG_TRACING
811 /* flags for current->trace */
813 TSK_TRACE_FL_TRACE_BIT = 0,
814 TSK_TRACE_FL_GRAPH_BIT = 1,
817 TSK_TRACE_FL_TRACE = 1 << TSK_TRACE_FL_TRACE_BIT,
818 TSK_TRACE_FL_GRAPH = 1 << TSK_TRACE_FL_GRAPH_BIT,
821 static inline void set_tsk_trace_trace(struct task_struct *tsk)
823 set_bit(TSK_TRACE_FL_TRACE_BIT, &tsk->trace);
826 static inline void clear_tsk_trace_trace(struct task_struct *tsk)
828 clear_bit(TSK_TRACE_FL_TRACE_BIT, &tsk->trace);
831 static inline int test_tsk_trace_trace(struct task_struct *tsk)
833 return tsk->trace & TSK_TRACE_FL_TRACE;
836 static inline void set_tsk_trace_graph(struct task_struct *tsk)
838 set_bit(TSK_TRACE_FL_GRAPH_BIT, &tsk->trace);
841 static inline void clear_tsk_trace_graph(struct task_struct *tsk)
843 clear_bit(TSK_TRACE_FL_GRAPH_BIT, &tsk->trace);
846 static inline int test_tsk_trace_graph(struct task_struct *tsk)
848 return tsk->trace & TSK_TRACE_FL_GRAPH;
851 enum ftrace_dump_mode;
853 extern enum ftrace_dump_mode ftrace_dump_on_oops;
855 extern void disable_trace_on_warning(void);
856 extern int __disable_trace_on_warning;
858 #ifdef CONFIG_PREEMPT
859 #define INIT_TRACE_RECURSION .trace_recursion = 0,
862 #else /* CONFIG_TRACING */
863 static inline void disable_trace_on_warning(void) { }
864 #endif /* CONFIG_TRACING */
866 #ifndef INIT_TRACE_RECURSION
867 #define INIT_TRACE_RECURSION
870 #ifdef CONFIG_FTRACE_SYSCALLS
872 unsigned long arch_syscall_addr(int nr);
874 #endif /* CONFIG_FTRACE_SYSCALLS */
876 #endif /* _LINUX_FTRACE_H */