2 * Ftrace header. For implementation details beyond the random comments
3 * scattered below, see: Documentation/trace/ftrace-design.txt
6 #ifndef _LINUX_FTRACE_H
7 #define _LINUX_FTRACE_H
9 #include <linux/trace_clock.h>
10 #include <linux/kallsyms.h>
11 #include <linux/linkage.h>
12 #include <linux/bitops.h>
13 #include <linux/ptrace.h>
14 #include <linux/ktime.h>
15 #include <linux/sched.h>
16 #include <linux/types.h>
17 #include <linux/init.h>
20 #include <asm/ftrace.h>
23 * If the arch supports passing the variable contents of
24 * function_trace_op as the third parameter back from the
25 * mcount call, then the arch should define this as 1.
27 #ifndef ARCH_SUPPORTS_FTRACE_OPS
28 #define ARCH_SUPPORTS_FTRACE_OPS 0
32 * If the arch's mcount caller does not support all of ftrace's
33 * features, then it must call an indirect function that
34 * does. Or at least does enough to prevent any unwelcomed side effects.
36 #if !ARCH_SUPPORTS_FTRACE_OPS
37 # define FTRACE_FORCE_LIST_FUNC 1
39 # define FTRACE_FORCE_LIST_FUNC 0
42 /* Main tracing buffer and events set up */
44 void trace_init(void);
45 void early_trace_init(void);
47 static inline void trace_init(void) { }
48 static inline void early_trace_init(void) { }
54 #ifdef CONFIG_FUNCTION_TRACER
56 extern int ftrace_enabled;
58 ftrace_enable_sysctl(struct ctl_table *table, int write,
59 void __user *buffer, size_t *lenp,
64 typedef void (*ftrace_func_t)(unsigned long ip, unsigned long parent_ip,
65 struct ftrace_ops *op, struct pt_regs *regs);
67 ftrace_func_t ftrace_ops_get_func(struct ftrace_ops *ops);
70 * FTRACE_OPS_FL_* bits denote the state of ftrace_ops struct and are
71 * set in the flags member.
72 * CONTROL, SAVE_REGS, SAVE_REGS_IF_SUPPORTED, RECURSION_SAFE, STUB and
73 * IPMODIFY are a kind of attribute flags which can be set only before
74 * registering the ftrace_ops, and can not be modified while registered.
75 * Changing those attribute flags after regsitering ftrace_ops will
76 * cause unexpected results.
78 * ENABLED - set/unset when ftrace_ops is registered/unregistered
79 * DYNAMIC - set when ftrace_ops is registered to denote dynamically
80 * allocated ftrace_ops which need special care
81 * PER_CPU - set manualy by ftrace_ops user to denote the ftrace_ops
82 * could be controlled by following calls:
83 * ftrace_function_local_enable
84 * ftrace_function_local_disable
85 * SAVE_REGS - The ftrace_ops wants regs saved at each function called
86 * and passed to the callback. If this flag is set, but the
87 * architecture does not support passing regs
88 * (CONFIG_DYNAMIC_FTRACE_WITH_REGS is not defined), then the
89 * ftrace_ops will fail to register, unless the next flag
91 * SAVE_REGS_IF_SUPPORTED - This is the same as SAVE_REGS, but if the
92 * handler can handle an arch that does not save regs
93 * (the handler tests if regs == NULL), then it can set
94 * this flag instead. It will not fail registering the ftrace_ops
95 * but, the regs field will be NULL if the arch does not support
96 * passing regs to the handler.
97 * Note, if this flag is set, the SAVE_REGS flag will automatically
98 * get set upon registering the ftrace_ops, if the arch supports it.
99 * RECURSION_SAFE - The ftrace_ops can set this to tell the ftrace infrastructure
100 * that the call back has its own recursion protection. If it does
101 * not set this, then the ftrace infrastructure will add recursion
102 * protection for the caller.
103 * STUB - The ftrace_ops is just a place holder.
104 * INITIALIZED - The ftrace_ops has already been initialized (first use time
105 * register_ftrace_function() is called, it will initialized the ops)
106 * DELETED - The ops are being deleted, do not let them be registered again.
107 * ADDING - The ops is in the process of being added.
108 * REMOVING - The ops is in the process of being removed.
109 * MODIFYING - The ops is in the process of changing its filter functions.
110 * ALLOC_TRAMP - A dynamic trampoline was allocated by the core code.
111 * The arch specific code sets this flag when it allocated a
112 * trampoline. This lets the arch know that it can update the
113 * trampoline in case the callback function changes.
114 * The ftrace_ops trampoline can be set by the ftrace users, and
115 * in such cases the arch must not modify it. Only the arch ftrace
116 * core code should set this flag.
117 * IPMODIFY - The ops can modify the IP register. This can only be set with
118 * SAVE_REGS. If another ops with this flag set is already registered
119 * for any of the functions that this ops will be registered for, then
120 * this ops will fail to register or set_filter_ip.
121 * PID - Is affected by set_ftrace_pid (allows filtering on those pids)
124 FTRACE_OPS_FL_ENABLED = 1 << 0,
125 FTRACE_OPS_FL_DYNAMIC = 1 << 1,
126 FTRACE_OPS_FL_PER_CPU = 1 << 2,
127 FTRACE_OPS_FL_SAVE_REGS = 1 << 3,
128 FTRACE_OPS_FL_SAVE_REGS_IF_SUPPORTED = 1 << 4,
129 FTRACE_OPS_FL_RECURSION_SAFE = 1 << 5,
130 FTRACE_OPS_FL_STUB = 1 << 6,
131 FTRACE_OPS_FL_INITIALIZED = 1 << 7,
132 FTRACE_OPS_FL_DELETED = 1 << 8,
133 FTRACE_OPS_FL_ADDING = 1 << 9,
134 FTRACE_OPS_FL_REMOVING = 1 << 10,
135 FTRACE_OPS_FL_MODIFYING = 1 << 11,
136 FTRACE_OPS_FL_ALLOC_TRAMP = 1 << 12,
137 FTRACE_OPS_FL_IPMODIFY = 1 << 13,
138 FTRACE_OPS_FL_PID = 1 << 14,
139 FTRACE_OPS_FL_RCU = 1 << 15,
142 #ifdef CONFIG_DYNAMIC_FTRACE
143 /* The hash used to know what functions callbacks trace */
144 struct ftrace_ops_hash {
145 struct ftrace_hash *notrace_hash;
146 struct ftrace_hash *filter_hash;
147 struct mutex regex_lock;
152 * Note, ftrace_ops can be referenced outside of RCU protection, unless
153 * the RCU flag is set. If ftrace_ops is allocated and not part of kernel
154 * core data, the unregistering of it will perform a scheduling on all CPUs
155 * to make sure that there are no more users. Depending on the load of the
156 * system that may take a bit of time.
158 * Any private data added must also take care not to be freed and if private
159 * data is added to a ftrace_ops that is in core code, the user of the
160 * ftrace_ops must perform a schedule_on_each_cpu() before freeing it.
164 struct ftrace_ops *next;
167 ftrace_func_t saved_func;
168 int __percpu *disabled;
169 #ifdef CONFIG_DYNAMIC_FTRACE
170 struct ftrace_ops_hash local_hash;
171 struct ftrace_ops_hash *func_hash;
172 struct ftrace_ops_hash old_hash;
173 unsigned long trampoline;
174 unsigned long trampoline_size;
179 * Type of the current tracing.
181 enum ftrace_tracing_type_t {
182 FTRACE_TYPE_ENTER = 0, /* Hook the call of the function */
183 FTRACE_TYPE_RETURN, /* Hook the return of the function */
186 /* Current tracing type, default is FTRACE_TYPE_ENTER */
187 extern enum ftrace_tracing_type_t ftrace_tracing_type;
190 * The ftrace_ops must be a static and should also
191 * be read_mostly. These functions do modify read_mostly variables
192 * so use them sparely. Never free an ftrace_op or modify the
193 * next pointer after it has been registered. Even after unregistering
194 * it, the next pointer may still be used internally.
196 int register_ftrace_function(struct ftrace_ops *ops);
197 int unregister_ftrace_function(struct ftrace_ops *ops);
198 void clear_ftrace_function(void);
201 * ftrace_function_local_enable - enable ftrace_ops on current cpu
203 * This function enables tracing on current cpu by decreasing
204 * the per cpu control variable.
205 * It must be called with preemption disabled and only on ftrace_ops
206 * registered with FTRACE_OPS_FL_PER_CPU. If called without preemption
207 * disabled, this_cpu_ptr will complain when CONFIG_DEBUG_PREEMPT is enabled.
209 static inline void ftrace_function_local_enable(struct ftrace_ops *ops)
211 if (WARN_ON_ONCE(!(ops->flags & FTRACE_OPS_FL_PER_CPU)))
214 (*this_cpu_ptr(ops->disabled))--;
218 * ftrace_function_local_disable - disable ftrace_ops on current cpu
220 * This function disables tracing on current cpu by increasing
221 * the per cpu control variable.
222 * It must be called with preemption disabled and only on ftrace_ops
223 * registered with FTRACE_OPS_FL_PER_CPU. If called without preemption
224 * disabled, this_cpu_ptr will complain when CONFIG_DEBUG_PREEMPT is enabled.
226 static inline void ftrace_function_local_disable(struct ftrace_ops *ops)
228 if (WARN_ON_ONCE(!(ops->flags & FTRACE_OPS_FL_PER_CPU)))
231 (*this_cpu_ptr(ops->disabled))++;
235 * ftrace_function_local_disabled - returns ftrace_ops disabled value
238 * This function returns value of ftrace_ops::disabled on current cpu.
239 * It must be called with preemption disabled and only on ftrace_ops
240 * registered with FTRACE_OPS_FL_PER_CPU. If called without preemption
241 * disabled, this_cpu_ptr will complain when CONFIG_DEBUG_PREEMPT is enabled.
243 static inline int ftrace_function_local_disabled(struct ftrace_ops *ops)
245 WARN_ON_ONCE(!(ops->flags & FTRACE_OPS_FL_PER_CPU));
246 return *this_cpu_ptr(ops->disabled);
249 extern void ftrace_stub(unsigned long a0, unsigned long a1,
250 struct ftrace_ops *op, struct pt_regs *regs);
252 #else /* !CONFIG_FUNCTION_TRACER */
254 * (un)register_ftrace_function must be a macro since the ops parameter
255 * must not be evaluated.
257 #define register_ftrace_function(ops) ({ 0; })
258 #define unregister_ftrace_function(ops) ({ 0; })
259 static inline int ftrace_nr_registered_ops(void)
263 static inline void clear_ftrace_function(void) { }
264 static inline void ftrace_kill(void) { }
265 #endif /* CONFIG_FUNCTION_TRACER */
267 #ifdef CONFIG_STACK_TRACER
269 #define STACK_TRACE_ENTRIES 500
273 extern unsigned stack_trace_index[];
274 extern struct stack_trace stack_trace_max;
275 extern unsigned long stack_trace_max_size;
276 extern arch_spinlock_t stack_trace_max_lock;
278 extern int stack_tracer_enabled;
279 void stack_trace_print(void);
281 stack_trace_sysctl(struct ctl_table *table, int write,
282 void __user *buffer, size_t *lenp,
286 struct ftrace_func_command {
287 struct list_head list;
289 int (*func)(struct ftrace_hash *hash,
290 char *func, char *cmd,
291 char *params, int enable);
294 #ifdef CONFIG_DYNAMIC_FTRACE
296 int ftrace_arch_code_modify_prepare(void);
297 int ftrace_arch_code_modify_post_process(void);
301 enum ftrace_bug_type {
308 extern enum ftrace_bug_type ftrace_bug_type;
311 * Archs can set this to point to a variable that holds the value that was
312 * expected at the call site before calling ftrace_bug().
314 extern const void *ftrace_expected;
316 void ftrace_bug(int err, struct dyn_ftrace *rec);
320 struct ftrace_probe_ops {
321 void (*func)(unsigned long ip,
322 unsigned long parent_ip,
324 int (*init)(struct ftrace_probe_ops *ops,
325 unsigned long ip, void **data);
326 void (*free)(struct ftrace_probe_ops *ops,
327 unsigned long ip, void **data);
328 int (*print)(struct seq_file *m,
330 struct ftrace_probe_ops *ops,
335 register_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops,
338 unregister_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops,
341 unregister_ftrace_function_probe_func(char *glob, struct ftrace_probe_ops *ops);
342 extern void unregister_ftrace_function_probe_all(char *glob);
344 extern int ftrace_text_reserved(const void *start, const void *end);
346 extern int ftrace_nr_registered_ops(void);
348 bool is_ftrace_trampoline(unsigned long addr);
351 * The dyn_ftrace record's flags field is split into two parts.
352 * the first part which is '0-FTRACE_REF_MAX' is a counter of
353 * the number of callbacks that have registered the function that
354 * the dyn_ftrace descriptor represents.
356 * The second part is a mask:
357 * ENABLED - the function is being traced
358 * REGS - the record wants the function to save regs
359 * REGS_EN - the function is set up to save regs.
360 * IPMODIFY - the record allows for the IP address to be changed.
361 * DISABLED - the record is not ready to be touched yet
363 * When a new ftrace_ops is registered and wants a function to save
364 * pt_regs, the rec->flag REGS is set. When the function has been
365 * set up to save regs, the REG_EN flag is set. Once a function
366 * starts saving regs it will do so until all ftrace_ops are removed
367 * from tracing that function.
370 FTRACE_FL_ENABLED = (1UL << 31),
371 FTRACE_FL_REGS = (1UL << 30),
372 FTRACE_FL_REGS_EN = (1UL << 29),
373 FTRACE_FL_TRAMP = (1UL << 28),
374 FTRACE_FL_TRAMP_EN = (1UL << 27),
375 FTRACE_FL_IPMODIFY = (1UL << 26),
376 FTRACE_FL_DISABLED = (1UL << 25),
379 #define FTRACE_REF_MAX_SHIFT 25
380 #define FTRACE_FL_BITS 7
381 #define FTRACE_FL_MASKED_BITS ((1UL << FTRACE_FL_BITS) - 1)
382 #define FTRACE_FL_MASK (FTRACE_FL_MASKED_BITS << FTRACE_REF_MAX_SHIFT)
383 #define FTRACE_REF_MAX ((1UL << FTRACE_REF_MAX_SHIFT) - 1)
385 #define ftrace_rec_count(rec) ((rec)->flags & ~FTRACE_FL_MASK)
388 unsigned long ip; /* address of mcount call-site */
390 struct dyn_arch_ftrace arch;
393 int ftrace_force_update(void);
394 int ftrace_set_filter_ip(struct ftrace_ops *ops, unsigned long ip,
395 int remove, int reset);
396 int ftrace_set_filter(struct ftrace_ops *ops, unsigned char *buf,
398 int ftrace_set_notrace(struct ftrace_ops *ops, unsigned char *buf,
400 void ftrace_set_global_filter(unsigned char *buf, int len, int reset);
401 void ftrace_set_global_notrace(unsigned char *buf, int len, int reset);
402 void ftrace_free_filter(struct ftrace_ops *ops);
403 void ftrace_ops_set_global_filter(struct ftrace_ops *ops);
405 int register_ftrace_command(struct ftrace_func_command *cmd);
406 int unregister_ftrace_command(struct ftrace_func_command *cmd);
409 FTRACE_UPDATE_CALLS = (1 << 0),
410 FTRACE_DISABLE_CALLS = (1 << 1),
411 FTRACE_UPDATE_TRACE_FUNC = (1 << 2),
412 FTRACE_START_FUNC_RET = (1 << 3),
413 FTRACE_STOP_FUNC_RET = (1 << 4),
417 * The FTRACE_UPDATE_* enum is used to pass information back
418 * from the ftrace_update_record() and ftrace_test_record()
419 * functions. These are called by the code update routines
420 * to find out what is to be done for a given function.
422 * IGNORE - The function is already what we want it to be
423 * MAKE_CALL - Start tracing the function
424 * MODIFY_CALL - Stop saving regs for the function
425 * MAKE_NOP - Stop tracing the function
428 FTRACE_UPDATE_IGNORE,
429 FTRACE_UPDATE_MAKE_CALL,
430 FTRACE_UPDATE_MODIFY_CALL,
431 FTRACE_UPDATE_MAKE_NOP,
435 FTRACE_ITER_FILTER = (1 << 0),
436 FTRACE_ITER_NOTRACE = (1 << 1),
437 FTRACE_ITER_PRINTALL = (1 << 2),
438 FTRACE_ITER_DO_HASH = (1 << 3),
439 FTRACE_ITER_HASH = (1 << 4),
440 FTRACE_ITER_ENABLED = (1 << 5),
443 void arch_ftrace_update_code(int command);
445 struct ftrace_rec_iter;
447 struct ftrace_rec_iter *ftrace_rec_iter_start(void);
448 struct ftrace_rec_iter *ftrace_rec_iter_next(struct ftrace_rec_iter *iter);
449 struct dyn_ftrace *ftrace_rec_iter_record(struct ftrace_rec_iter *iter);
451 #define for_ftrace_rec_iter(iter) \
452 for (iter = ftrace_rec_iter_start(); \
454 iter = ftrace_rec_iter_next(iter))
457 int ftrace_update_record(struct dyn_ftrace *rec, int enable);
458 int ftrace_test_record(struct dyn_ftrace *rec, int enable);
459 void ftrace_run_stop_machine(int command);
460 unsigned long ftrace_location(unsigned long ip);
461 unsigned long ftrace_location_range(unsigned long start, unsigned long end);
462 unsigned long ftrace_get_addr_new(struct dyn_ftrace *rec);
463 unsigned long ftrace_get_addr_curr(struct dyn_ftrace *rec);
465 extern ftrace_func_t ftrace_trace_function;
467 int ftrace_regex_open(struct ftrace_ops *ops, int flag,
468 struct inode *inode, struct file *file);
469 ssize_t ftrace_filter_write(struct file *file, const char __user *ubuf,
470 size_t cnt, loff_t *ppos);
471 ssize_t ftrace_notrace_write(struct file *file, const char __user *ubuf,
472 size_t cnt, loff_t *ppos);
473 int ftrace_regex_release(struct inode *inode, struct file *file);
476 ftrace_set_early_filter(struct ftrace_ops *ops, char *buf, int enable);
478 /* defined in arch */
479 extern int ftrace_ip_converted(unsigned long ip);
480 extern int ftrace_dyn_arch_init(void);
481 extern void ftrace_replace_code(int enable);
482 extern int ftrace_update_ftrace_func(ftrace_func_t func);
483 extern void ftrace_caller(void);
484 extern void ftrace_regs_caller(void);
485 extern void ftrace_call(void);
486 extern void ftrace_regs_call(void);
487 extern void mcount_call(void);
489 void ftrace_modify_all_code(int command);
492 #define FTRACE_ADDR ((unsigned long)ftrace_caller)
495 #ifndef FTRACE_GRAPH_ADDR
496 #define FTRACE_GRAPH_ADDR ((unsigned long)ftrace_graph_caller)
499 #ifndef FTRACE_REGS_ADDR
500 #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
501 # define FTRACE_REGS_ADDR ((unsigned long)ftrace_regs_caller)
503 # define FTRACE_REGS_ADDR FTRACE_ADDR
508 * If an arch would like functions that are only traced
509 * by the function graph tracer to jump directly to its own
510 * trampoline, then they can define FTRACE_GRAPH_TRAMP_ADDR
511 * to be that address to jump to.
513 #ifndef FTRACE_GRAPH_TRAMP_ADDR
514 #define FTRACE_GRAPH_TRAMP_ADDR ((unsigned long) 0)
517 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
518 extern void ftrace_graph_caller(void);
519 extern int ftrace_enable_ftrace_graph_caller(void);
520 extern int ftrace_disable_ftrace_graph_caller(void);
522 static inline int ftrace_enable_ftrace_graph_caller(void) { return 0; }
523 static inline int ftrace_disable_ftrace_graph_caller(void) { return 0; }
527 * ftrace_make_nop - convert code into nop
528 * @mod: module structure if called by module load initialization
529 * @rec: the mcount call site record
530 * @addr: the address that the call site should be calling
532 * This is a very sensitive operation and great care needs
533 * to be taken by the arch. The operation should carefully
534 * read the location, check to see if what is read is indeed
535 * what we expect it to be, and then on success of the compare,
536 * it should write to the location.
538 * The code segment at @rec->ip should be a caller to @addr
542 * -EFAULT on error reading the location
543 * -EINVAL on a failed compare of the contents
544 * -EPERM on error writing to the location
545 * Any other value will be considered a failure.
547 extern int ftrace_make_nop(struct module *mod,
548 struct dyn_ftrace *rec, unsigned long addr);
551 * ftrace_make_call - convert a nop call site into a call to addr
552 * @rec: the mcount call site record
553 * @addr: the address that the call site should call
555 * This is a very sensitive operation and great care needs
556 * to be taken by the arch. The operation should carefully
557 * read the location, check to see if what is read is indeed
558 * what we expect it to be, and then on success of the compare,
559 * it should write to the location.
561 * The code segment at @rec->ip should be a nop
565 * -EFAULT on error reading the location
566 * -EINVAL on a failed compare of the contents
567 * -EPERM on error writing to the location
568 * Any other value will be considered a failure.
570 extern int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr);
572 #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
574 * ftrace_modify_call - convert from one addr to another (no nop)
575 * @rec: the mcount call site record
576 * @old_addr: the address expected to be currently called to
577 * @addr: the address to change to
579 * This is a very sensitive operation and great care needs
580 * to be taken by the arch. The operation should carefully
581 * read the location, check to see if what is read is indeed
582 * what we expect it to be, and then on success of the compare,
583 * it should write to the location.
585 * The code segment at @rec->ip should be a caller to @old_addr
589 * -EFAULT on error reading the location
590 * -EINVAL on a failed compare of the contents
591 * -EPERM on error writing to the location
592 * Any other value will be considered a failure.
594 extern int ftrace_modify_call(struct dyn_ftrace *rec, unsigned long old_addr,
597 /* Should never be called */
598 static inline int ftrace_modify_call(struct dyn_ftrace *rec, unsigned long old_addr,
605 /* May be defined in arch */
606 extern int ftrace_arch_read_dyn_info(char *buf, int size);
608 extern int skip_trace(unsigned long ip);
609 extern void ftrace_module_init(struct module *mod);
610 extern void ftrace_module_enable(struct module *mod);
611 extern void ftrace_release_mod(struct module *mod);
613 extern void ftrace_disable_daemon(void);
614 extern void ftrace_enable_daemon(void);
615 #else /* CONFIG_DYNAMIC_FTRACE */
616 static inline int skip_trace(unsigned long ip) { return 0; }
617 static inline int ftrace_force_update(void) { return 0; }
618 static inline void ftrace_disable_daemon(void) { }
619 static inline void ftrace_enable_daemon(void) { }
620 static inline void ftrace_module_init(struct module *mod) { }
621 static inline void ftrace_module_enable(struct module *mod) { }
622 static inline void ftrace_release_mod(struct module *mod) { }
623 static inline __init int register_ftrace_command(struct ftrace_func_command *cmd)
627 static inline __init int unregister_ftrace_command(char *cmd_name)
631 static inline int ftrace_text_reserved(const void *start, const void *end)
635 static inline unsigned long ftrace_location(unsigned long ip)
641 * Again users of functions that have ftrace_ops may not
642 * have them defined when ftrace is not enabled, but these
643 * functions may still be called. Use a macro instead of inline.
645 #define ftrace_regex_open(ops, flag, inod, file) ({ -ENODEV; })
646 #define ftrace_set_early_filter(ops, buf, enable) do { } while (0)
647 #define ftrace_set_filter_ip(ops, ip, remove, reset) ({ -ENODEV; })
648 #define ftrace_set_filter(ops, buf, len, reset) ({ -ENODEV; })
649 #define ftrace_set_notrace(ops, buf, len, reset) ({ -ENODEV; })
650 #define ftrace_free_filter(ops) do { } while (0)
651 #define ftrace_ops_set_global_filter(ops) do { } while (0)
653 static inline ssize_t ftrace_filter_write(struct file *file, const char __user *ubuf,
654 size_t cnt, loff_t *ppos) { return -ENODEV; }
655 static inline ssize_t ftrace_notrace_write(struct file *file, const char __user *ubuf,
656 size_t cnt, loff_t *ppos) { return -ENODEV; }
658 ftrace_regex_release(struct inode *inode, struct file *file) { return -ENODEV; }
660 static inline bool is_ftrace_trampoline(unsigned long addr)
664 #endif /* CONFIG_DYNAMIC_FTRACE */
666 /* totally disable ftrace - can not re-enable after this */
667 void ftrace_kill(void);
669 static inline void tracer_disable(void)
671 #ifdef CONFIG_FUNCTION_TRACER
677 * Ftrace disable/restore without lock. Some synchronization mechanism
678 * must be used to prevent ftrace_enabled to be changed between
681 static inline int __ftrace_enabled_save(void)
683 #ifdef CONFIG_FUNCTION_TRACER
684 int saved_ftrace_enabled = ftrace_enabled;
686 return saved_ftrace_enabled;
692 static inline void __ftrace_enabled_restore(int enabled)
694 #ifdef CONFIG_FUNCTION_TRACER
695 ftrace_enabled = enabled;
699 /* All archs should have this, but we define it for consistency */
700 #ifndef ftrace_return_address0
701 # define ftrace_return_address0 __builtin_return_address(0)
704 /* Archs may use other ways for ADDR1 and beyond */
705 #ifndef ftrace_return_address
706 # ifdef CONFIG_FRAME_POINTER
707 # define ftrace_return_address(n) __builtin_return_address(n)
709 # define ftrace_return_address(n) 0UL
713 #define CALLER_ADDR0 ((unsigned long)ftrace_return_address0)
714 #define CALLER_ADDR1 ((unsigned long)ftrace_return_address(1))
715 #define CALLER_ADDR2 ((unsigned long)ftrace_return_address(2))
716 #define CALLER_ADDR3 ((unsigned long)ftrace_return_address(3))
717 #define CALLER_ADDR4 ((unsigned long)ftrace_return_address(4))
718 #define CALLER_ADDR5 ((unsigned long)ftrace_return_address(5))
719 #define CALLER_ADDR6 ((unsigned long)ftrace_return_address(6))
721 static inline unsigned long get_lock_parent_ip(void)
723 unsigned long addr = CALLER_ADDR0;
725 if (!in_lock_functions(addr))
728 if (!in_lock_functions(addr))
733 #ifdef CONFIG_IRQSOFF_TRACER
734 extern void time_hardirqs_on(unsigned long a0, unsigned long a1);
735 extern void time_hardirqs_off(unsigned long a0, unsigned long a1);
737 static inline void time_hardirqs_on(unsigned long a0, unsigned long a1) { }
738 static inline void time_hardirqs_off(unsigned long a0, unsigned long a1) { }
741 #ifdef CONFIG_PREEMPT_TRACER
742 extern void trace_preempt_on(unsigned long a0, unsigned long a1);
743 extern void trace_preempt_off(unsigned long a0, unsigned long a1);
746 * Use defines instead of static inlines because some arches will make code out
747 * of the CALLER_ADDR, when we really want these to be a real nop.
749 # define trace_preempt_on(a0, a1) do { } while (0)
750 # define trace_preempt_off(a0, a1) do { } while (0)
753 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
754 extern void ftrace_init(void);
756 static inline void ftrace_init(void) { }
760 * Structure that defines an entry function trace.
761 * It's already packed but the attribute "packed" is needed
762 * to remove extra padding at the end.
764 struct ftrace_graph_ent {
765 unsigned long func; /* Current function */
770 * Structure that defines a return function trace.
771 * It's already packed but the attribute "packed" is needed
772 * to remove extra padding at the end.
774 struct ftrace_graph_ret {
775 unsigned long func; /* Current function */
776 /* Number of functions that overran the depth limit for current task */
777 unsigned long overrun;
778 unsigned long long calltime;
779 unsigned long long rettime;
783 /* Type of the callback handlers for tracing function graph*/
784 typedef void (*trace_func_graph_ret_t)(struct ftrace_graph_ret *); /* return */
785 typedef int (*trace_func_graph_ent_t)(struct ftrace_graph_ent *); /* entry */
787 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
790 #define INIT_FTRACE_GRAPH .ret_stack = NULL,
793 * Stack of return addresses for functions
795 * Used in struct thread_info
797 struct ftrace_ret_stack {
800 unsigned long long calltime;
801 #ifdef CONFIG_FUNCTION_PROFILER
802 unsigned long long subtime;
804 #ifdef HAVE_FUNCTION_GRAPH_FP_TEST
807 #ifdef HAVE_FUNCTION_GRAPH_RET_ADDR_PTR
813 * Primary handler of a function return.
814 * It relays on ftrace_return_to_handler.
815 * Defined in entry_32/64.S
817 extern void return_to_handler(void);
820 ftrace_push_return_trace(unsigned long ret, unsigned long func, int *depth,
821 unsigned long frame_pointer, unsigned long *retp);
823 unsigned long ftrace_graph_ret_addr(struct task_struct *task, int *idx,
824 unsigned long ret, unsigned long *retp);
827 * Sometimes we don't want to trace a function with the function
828 * graph tracer but we want them to keep traced by the usual function
829 * tracer if the function graph tracer is not configured.
831 #define __notrace_funcgraph notrace
833 #define FTRACE_NOTRACE_DEPTH 65536
834 #define FTRACE_RETFUNC_DEPTH 50
835 #define FTRACE_RETSTACK_ALLOC_SIZE 32
836 extern int register_ftrace_graph(trace_func_graph_ret_t retfunc,
837 trace_func_graph_ent_t entryfunc);
839 extern bool ftrace_graph_is_dead(void);
840 extern void ftrace_graph_stop(void);
842 /* The current handlers in use */
843 extern trace_func_graph_ret_t ftrace_graph_return;
844 extern trace_func_graph_ent_t ftrace_graph_entry;
846 extern void unregister_ftrace_graph(void);
848 extern void ftrace_graph_init_task(struct task_struct *t);
849 extern void ftrace_graph_exit_task(struct task_struct *t);
850 extern void ftrace_graph_init_idle_task(struct task_struct *t, int cpu);
852 static inline int task_curr_ret_stack(struct task_struct *t)
854 return t->curr_ret_stack;
857 static inline void pause_graph_tracing(void)
859 atomic_inc(¤t->tracing_graph_pause);
862 static inline void unpause_graph_tracing(void)
864 atomic_dec(¤t->tracing_graph_pause);
866 #else /* !CONFIG_FUNCTION_GRAPH_TRACER */
868 #define __notrace_funcgraph
869 #define INIT_FTRACE_GRAPH
871 static inline void ftrace_graph_init_task(struct task_struct *t) { }
872 static inline void ftrace_graph_exit_task(struct task_struct *t) { }
873 static inline void ftrace_graph_init_idle_task(struct task_struct *t, int cpu) { }
875 static inline int register_ftrace_graph(trace_func_graph_ret_t retfunc,
876 trace_func_graph_ent_t entryfunc)
880 static inline void unregister_ftrace_graph(void) { }
882 static inline int task_curr_ret_stack(struct task_struct *tsk)
887 static inline unsigned long
888 ftrace_graph_ret_addr(struct task_struct *task, int *idx, unsigned long ret,
894 static inline void pause_graph_tracing(void) { }
895 static inline void unpause_graph_tracing(void) { }
896 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
898 #ifdef CONFIG_TRACING
900 /* flags for current->trace */
902 TSK_TRACE_FL_TRACE_BIT = 0,
903 TSK_TRACE_FL_GRAPH_BIT = 1,
906 TSK_TRACE_FL_TRACE = 1 << TSK_TRACE_FL_TRACE_BIT,
907 TSK_TRACE_FL_GRAPH = 1 << TSK_TRACE_FL_GRAPH_BIT,
910 static inline void set_tsk_trace_trace(struct task_struct *tsk)
912 set_bit(TSK_TRACE_FL_TRACE_BIT, &tsk->trace);
915 static inline void clear_tsk_trace_trace(struct task_struct *tsk)
917 clear_bit(TSK_TRACE_FL_TRACE_BIT, &tsk->trace);
920 static inline int test_tsk_trace_trace(struct task_struct *tsk)
922 return tsk->trace & TSK_TRACE_FL_TRACE;
925 static inline void set_tsk_trace_graph(struct task_struct *tsk)
927 set_bit(TSK_TRACE_FL_GRAPH_BIT, &tsk->trace);
930 static inline void clear_tsk_trace_graph(struct task_struct *tsk)
932 clear_bit(TSK_TRACE_FL_GRAPH_BIT, &tsk->trace);
935 static inline int test_tsk_trace_graph(struct task_struct *tsk)
937 return tsk->trace & TSK_TRACE_FL_GRAPH;
940 enum ftrace_dump_mode;
942 extern enum ftrace_dump_mode ftrace_dump_on_oops;
943 extern int tracepoint_printk;
945 extern void disable_trace_on_warning(void);
946 extern int __disable_trace_on_warning;
948 #ifdef CONFIG_PREEMPT
949 #define INIT_TRACE_RECURSION .trace_recursion = 0,
952 int tracepoint_printk_sysctl(struct ctl_table *table, int write,
953 void __user *buffer, size_t *lenp,
956 #else /* CONFIG_TRACING */
957 static inline void disable_trace_on_warning(void) { }
958 #endif /* CONFIG_TRACING */
960 #ifndef INIT_TRACE_RECURSION
961 #define INIT_TRACE_RECURSION
964 #ifdef CONFIG_FTRACE_SYSCALLS
966 unsigned long arch_syscall_addr(int nr);
968 #endif /* CONFIG_FTRACE_SYSCALLS */
970 #endif /* _LINUX_FTRACE_H */