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1 | /* |
2 | * Ftrace header. For implementation details beyond the random comments |
3 | * scattered below, see: Documentation/trace/ftrace-design.txt |
4 | */ |
5 | |
6 | #ifndef _LINUX_FTRACE_H |
7 | #define _LINUX_FTRACE_H |
8 | |
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> |
18 | #include <linux/fs.h> |
19 | |
20 | #include <asm/ftrace.h> |
21 | |
22 | /* |
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. |
26 | */ |
27 | #ifndef ARCH_SUPPORTS_FTRACE_OPS |
28 | #define ARCH_SUPPORTS_FTRACE_OPS 0 |
29 | #endif |
30 | |
31 | /* |
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. |
35 | */ |
36 | #if !defined(CONFIG_HAVE_FUNCTION_TRACE_MCOUNT_TEST) || \ |
37 | !ARCH_SUPPORTS_FTRACE_OPS |
38 | # define FTRACE_FORCE_LIST_FUNC 1 |
39 | #else |
40 | # define FTRACE_FORCE_LIST_FUNC 0 |
41 | #endif |
42 | |
43 | |
44 | struct module; |
45 | struct ftrace_hash; |
46 | |
47 | #ifdef CONFIG_FUNCTION_TRACER |
48 | |
49 | extern int ftrace_enabled; |
50 | extern int |
51 | ftrace_enable_sysctl(struct ctl_table *table, int write, |
52 | void __user *buffer, size_t *lenp, |
53 | loff_t *ppos); |
54 | |
55 | struct ftrace_ops; |
56 | |
57 | typedef void (*ftrace_func_t)(unsigned long ip, unsigned long parent_ip, |
58 | struct ftrace_ops *op, struct pt_regs *regs); |
59 | |
60 | /* |
61 | * FTRACE_OPS_FL_* bits denote the state of ftrace_ops struct and are |
62 | * set in the flags member. |
63 | * |
64 | * ENABLED - set/unset when ftrace_ops is registered/unregistered |
65 | * GLOBAL - set manualy by ftrace_ops user to denote the ftrace_ops |
66 | * is part of the global tracers sharing the same filter |
67 | * via set_ftrace_* debugfs files. |
68 | * DYNAMIC - set when ftrace_ops is registered to denote dynamically |
69 | * allocated ftrace_ops which need special care |
70 | * CONTROL - set manualy by ftrace_ops user to denote the ftrace_ops |
71 | * could be controled by following calls: |
72 | * ftrace_function_local_enable |
73 | * ftrace_function_local_disable |
74 | * SAVE_REGS - The ftrace_ops wants regs saved at each function called |
75 | * and passed to the callback. If this flag is set, but the |
76 | * architecture does not support passing regs |
77 | * (CONFIG_DYNAMIC_FTRACE_WITH_REGS is not defined), then the |
78 | * ftrace_ops will fail to register, unless the next flag |
79 | * is set. |
80 | * SAVE_REGS_IF_SUPPORTED - This is the same as SAVE_REGS, but if the |
81 | * handler can handle an arch that does not save regs |
82 | * (the handler tests if regs == NULL), then it can set |
83 | * this flag instead. It will not fail registering the ftrace_ops |
84 | * but, the regs field will be NULL if the arch does not support |
85 | * passing regs to the handler. |
86 | * Note, if this flag is set, the SAVE_REGS flag will automatically |
87 | * get set upon registering the ftrace_ops, if the arch supports it. |
88 | * RECURSION_SAFE - The ftrace_ops can set this to tell the ftrace infrastructure |
89 | * that the call back has its own recursion protection. If it does |
90 | * not set this, then the ftrace infrastructure will add recursion |
91 | * protection for the caller. |
92 | * STUB - The ftrace_ops is just a place holder. |
93 | */ |
94 | enum { |
95 | FTRACE_OPS_FL_ENABLED = 1 << 0, |
96 | FTRACE_OPS_FL_GLOBAL = 1 << 1, |
97 | FTRACE_OPS_FL_DYNAMIC = 1 << 2, |
98 | FTRACE_OPS_FL_CONTROL = 1 << 3, |
99 | FTRACE_OPS_FL_SAVE_REGS = 1 << 4, |
100 | FTRACE_OPS_FL_SAVE_REGS_IF_SUPPORTED = 1 << 5, |
101 | FTRACE_OPS_FL_RECURSION_SAFE = 1 << 6, |
102 | FTRACE_OPS_FL_STUB = 1 << 7, |
103 | }; |
104 | |
105 | struct ftrace_ops { |
106 | ftrace_func_t func; |
107 | struct ftrace_ops *next; |
108 | unsigned long flags; |
109 | int __percpu *disabled; |
110 | #ifdef CONFIG_DYNAMIC_FTRACE |
111 | struct ftrace_hash *notrace_hash; |
112 | struct ftrace_hash *filter_hash; |
113 | #endif |
114 | }; |
115 | |
116 | extern int function_trace_stop; |
117 | |
118 | /* |
119 | * Type of the current tracing. |
120 | */ |
121 | enum ftrace_tracing_type_t { |
122 | FTRACE_TYPE_ENTER = 0, /* Hook the call of the function */ |
123 | FTRACE_TYPE_RETURN, /* Hook the return of the function */ |
124 | }; |
125 | |
126 | /* Current tracing type, default is FTRACE_TYPE_ENTER */ |
127 | extern enum ftrace_tracing_type_t ftrace_tracing_type; |
128 | |
129 | /** |
130 | * ftrace_stop - stop function tracer. |
131 | * |
132 | * A quick way to stop the function tracer. Note this an on off switch, |
133 | * it is not something that is recursive like preempt_disable. |
134 | * This does not disable the calling of mcount, it only stops the |
135 | * calling of functions from mcount. |
136 | */ |
137 | static inline void ftrace_stop(void) |
138 | { |
139 | function_trace_stop = 1; |
140 | } |
141 | |
142 | /** |
143 | * ftrace_start - start the function tracer. |
144 | * |
145 | * This function is the inverse of ftrace_stop. This does not enable |
146 | * the function tracing if the function tracer is disabled. This only |
147 | * sets the function tracer flag to continue calling the functions |
148 | * from mcount. |
149 | */ |
150 | static inline void ftrace_start(void) |
151 | { |
152 | function_trace_stop = 0; |
153 | } |
154 | |
155 | /* |
156 | * The ftrace_ops must be a static and should also |
157 | * be read_mostly. These functions do modify read_mostly variables |
158 | * so use them sparely. Never free an ftrace_op or modify the |
159 | * next pointer after it has been registered. Even after unregistering |
160 | * it, the next pointer may still be used internally. |
161 | */ |
162 | int register_ftrace_function(struct ftrace_ops *ops); |
163 | int unregister_ftrace_function(struct ftrace_ops *ops); |
164 | void clear_ftrace_function(void); |
165 | |
166 | /** |
167 | * ftrace_function_local_enable - enable controlled ftrace_ops on current cpu |
168 | * |
169 | * This function enables tracing on current cpu by decreasing |
170 | * the per cpu control variable. |
171 | * It must be called with preemption disabled and only on ftrace_ops |
172 | * registered with FTRACE_OPS_FL_CONTROL. If called without preemption |
173 | * disabled, this_cpu_ptr will complain when CONFIG_DEBUG_PREEMPT is enabled. |
174 | */ |
175 | static inline void ftrace_function_local_enable(struct ftrace_ops *ops) |
176 | { |
177 | if (WARN_ON_ONCE(!(ops->flags & FTRACE_OPS_FL_CONTROL))) |
178 | return; |
179 | |
180 | (*this_cpu_ptr(ops->disabled))--; |
181 | } |
182 | |
183 | /** |
184 | * ftrace_function_local_disable - enable controlled ftrace_ops on current cpu |
185 | * |
186 | * This function enables tracing on current cpu by decreasing |
187 | * the per cpu control variable. |
188 | * It must be called with preemption disabled and only on ftrace_ops |
189 | * registered with FTRACE_OPS_FL_CONTROL. If called without preemption |
190 | * disabled, this_cpu_ptr will complain when CONFIG_DEBUG_PREEMPT is enabled. |
191 | */ |
192 | static inline void ftrace_function_local_disable(struct ftrace_ops *ops) |
193 | { |
194 | if (WARN_ON_ONCE(!(ops->flags & FTRACE_OPS_FL_CONTROL))) |
195 | return; |
196 | |
197 | (*this_cpu_ptr(ops->disabled))++; |
198 | } |
199 | |
200 | /** |
201 | * ftrace_function_local_disabled - returns ftrace_ops disabled value |
202 | * on current cpu |
203 | * |
204 | * This function returns value of ftrace_ops::disabled on current cpu. |
205 | * It must be called with preemption disabled and only on ftrace_ops |
206 | * registered with FTRACE_OPS_FL_CONTROL. If called without preemption |
207 | * disabled, this_cpu_ptr will complain when CONFIG_DEBUG_PREEMPT is enabled. |
208 | */ |
209 | static inline int ftrace_function_local_disabled(struct ftrace_ops *ops) |
210 | { |
211 | WARN_ON_ONCE(!(ops->flags & FTRACE_OPS_FL_CONTROL)); |
212 | return *this_cpu_ptr(ops->disabled); |
213 | } |
214 | |
215 | extern void ftrace_stub(unsigned long a0, unsigned long a1, |
216 | struct ftrace_ops *op, struct pt_regs *regs); |
217 | |
218 | #else /* !CONFIG_FUNCTION_TRACER */ |
219 | /* |
220 | * (un)register_ftrace_function must be a macro since the ops parameter |
221 | * must not be evaluated. |
222 | */ |
223 | #define register_ftrace_function(ops) ({ 0; }) |
224 | #define unregister_ftrace_function(ops) ({ 0; }) |
225 | static inline int ftrace_nr_registered_ops(void) |
226 | { |
227 | return 0; |
228 | } |
229 | static inline void clear_ftrace_function(void) { } |
230 | static inline void ftrace_kill(void) { } |
231 | static inline void ftrace_stop(void) { } |
232 | static inline void ftrace_start(void) { } |
233 | #endif /* CONFIG_FUNCTION_TRACER */ |
234 | |
235 | #ifdef CONFIG_STACK_TRACER |
236 | extern int stack_tracer_enabled; |
237 | int |
238 | stack_trace_sysctl(struct ctl_table *table, int write, |
239 | void __user *buffer, size_t *lenp, |
240 | loff_t *ppos); |
241 | #endif |
242 | |
243 | struct ftrace_func_command { |
244 | struct list_head list; |
245 | char *name; |
246 | int (*func)(struct ftrace_hash *hash, |
247 | char *func, char *cmd, |
248 | char *params, int enable); |
249 | }; |
250 | |
251 | #ifdef CONFIG_DYNAMIC_FTRACE |
252 | |
253 | int ftrace_arch_code_modify_prepare(void); |
254 | int ftrace_arch_code_modify_post_process(void); |
255 | |
256 | void ftrace_bug(int err, unsigned long ip); |
257 | |
258 | struct seq_file; |
259 | |
260 | struct ftrace_probe_ops { |
261 | void (*func)(unsigned long ip, |
262 | unsigned long parent_ip, |
263 | void **data); |
264 | int (*callback)(unsigned long ip, void **data); |
265 | void (*free)(void **data); |
266 | int (*print)(struct seq_file *m, |
267 | unsigned long ip, |
268 | struct ftrace_probe_ops *ops, |
269 | void *data); |
270 | }; |
271 | |
272 | extern int |
273 | register_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops, |
274 | void *data); |
275 | extern void |
276 | unregister_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops, |
277 | void *data); |
278 | extern void |
279 | unregister_ftrace_function_probe_func(char *glob, struct ftrace_probe_ops *ops); |
280 | extern void unregister_ftrace_function_probe_all(char *glob); |
281 | |
282 | extern int ftrace_text_reserved(void *start, void *end); |
283 | |
284 | extern int ftrace_nr_registered_ops(void); |
285 | |
286 | /* |
287 | * The dyn_ftrace record's flags field is split into two parts. |
288 | * the first part which is '0-FTRACE_REF_MAX' is a counter of |
289 | * the number of callbacks that have registered the function that |
290 | * the dyn_ftrace descriptor represents. |
291 | * |
292 | * The second part is a mask: |
293 | * ENABLED - the function is being traced |
294 | * REGS - the record wants the function to save regs |
295 | * REGS_EN - the function is set up to save regs. |
296 | * |
297 | * When a new ftrace_ops is registered and wants a function to save |
298 | * pt_regs, the rec->flag REGS is set. When the function has been |
299 | * set up to save regs, the REG_EN flag is set. Once a function |
300 | * starts saving regs it will do so until all ftrace_ops are removed |
301 | * from tracing that function. |
302 | */ |
303 | enum { |
304 | FTRACE_FL_ENABLED = (1UL << 29), |
305 | FTRACE_FL_REGS = (1UL << 30), |
306 | FTRACE_FL_REGS_EN = (1UL << 31) |
307 | }; |
308 | |
309 | #define FTRACE_FL_MASK (0x7UL << 29) |
310 | #define FTRACE_REF_MAX ((1UL << 29) - 1) |
311 | |
312 | struct dyn_ftrace { |
313 | union { |
314 | unsigned long ip; /* address of mcount call-site */ |
315 | struct dyn_ftrace *freelist; |
316 | }; |
317 | unsigned long flags; |
318 | struct dyn_arch_ftrace arch; |
319 | }; |
320 | |
321 | int ftrace_force_update(void); |
322 | int ftrace_set_filter_ip(struct ftrace_ops *ops, unsigned long ip, |
323 | int remove, int reset); |
324 | int ftrace_set_filter(struct ftrace_ops *ops, unsigned char *buf, |
325 | int len, int reset); |
326 | int ftrace_set_notrace(struct ftrace_ops *ops, unsigned char *buf, |
327 | int len, int reset); |
328 | void ftrace_set_global_filter(unsigned char *buf, int len, int reset); |
329 | void ftrace_set_global_notrace(unsigned char *buf, int len, int reset); |
330 | void ftrace_free_filter(struct ftrace_ops *ops); |
331 | |
332 | int register_ftrace_command(struct ftrace_func_command *cmd); |
333 | int unregister_ftrace_command(struct ftrace_func_command *cmd); |
334 | |
335 | enum { |
336 | FTRACE_UPDATE_CALLS = (1 << 0), |
337 | FTRACE_DISABLE_CALLS = (1 << 1), |
338 | FTRACE_UPDATE_TRACE_FUNC = (1 << 2), |
339 | FTRACE_START_FUNC_RET = (1 << 3), |
340 | FTRACE_STOP_FUNC_RET = (1 << 4), |
341 | }; |
342 | |
343 | /* |
344 | * The FTRACE_UPDATE_* enum is used to pass information back |
345 | * from the ftrace_update_record() and ftrace_test_record() |
346 | * functions. These are called by the code update routines |
347 | * to find out what is to be done for a given function. |
348 | * |
349 | * IGNORE - The function is already what we want it to be |
350 | * MAKE_CALL - Start tracing the function |
351 | * MODIFY_CALL - Stop saving regs for the function |
352 | * MODIFY_CALL_REGS - Start saving regs for the function |
353 | * MAKE_NOP - Stop tracing the function |
354 | */ |
355 | enum { |
356 | FTRACE_UPDATE_IGNORE, |
357 | FTRACE_UPDATE_MAKE_CALL, |
358 | FTRACE_UPDATE_MODIFY_CALL, |
359 | FTRACE_UPDATE_MODIFY_CALL_REGS, |
360 | FTRACE_UPDATE_MAKE_NOP, |
361 | }; |
362 | |
363 | enum { |
364 | FTRACE_ITER_FILTER = (1 << 0), |
365 | FTRACE_ITER_NOTRACE = (1 << 1), |
366 | FTRACE_ITER_PRINTALL = (1 << 2), |
367 | FTRACE_ITER_DO_HASH = (1 << 3), |
368 | FTRACE_ITER_HASH = (1 << 4), |
369 | FTRACE_ITER_ENABLED = (1 << 5), |
370 | }; |
371 | |
372 | void arch_ftrace_update_code(int command); |
373 | |
374 | struct ftrace_rec_iter; |
375 | |
376 | struct ftrace_rec_iter *ftrace_rec_iter_start(void); |
377 | struct ftrace_rec_iter *ftrace_rec_iter_next(struct ftrace_rec_iter *iter); |
378 | struct dyn_ftrace *ftrace_rec_iter_record(struct ftrace_rec_iter *iter); |
379 | |
380 | #define for_ftrace_rec_iter(iter) \ |
381 | for (iter = ftrace_rec_iter_start(); \ |
382 | iter; \ |
383 | iter = ftrace_rec_iter_next(iter)) |
384 | |
385 | |
386 | int ftrace_update_record(struct dyn_ftrace *rec, int enable); |
387 | int ftrace_test_record(struct dyn_ftrace *rec, int enable); |
388 | void ftrace_run_stop_machine(int command); |
389 | unsigned long ftrace_location(unsigned long ip); |
390 | |
391 | extern ftrace_func_t ftrace_trace_function; |
392 | |
393 | int ftrace_regex_open(struct ftrace_ops *ops, int flag, |
394 | struct inode *inode, struct file *file); |
395 | ssize_t ftrace_filter_write(struct file *file, const char __user *ubuf, |
396 | size_t cnt, loff_t *ppos); |
397 | ssize_t ftrace_notrace_write(struct file *file, const char __user *ubuf, |
398 | size_t cnt, loff_t *ppos); |
399 | int ftrace_regex_release(struct inode *inode, struct file *file); |
400 | |
401 | void __init |
402 | ftrace_set_early_filter(struct ftrace_ops *ops, char *buf, int enable); |
403 | |
404 | /* defined in arch */ |
405 | extern int ftrace_ip_converted(unsigned long ip); |
406 | extern int ftrace_dyn_arch_init(void *data); |
407 | extern void ftrace_replace_code(int enable); |
408 | extern int ftrace_update_ftrace_func(ftrace_func_t func); |
409 | extern void ftrace_caller(void); |
410 | extern void ftrace_regs_caller(void); |
411 | extern void ftrace_call(void); |
412 | extern void ftrace_regs_call(void); |
413 | extern void mcount_call(void); |
414 | |
415 | void ftrace_modify_all_code(int command); |
416 | |
417 | #ifndef FTRACE_ADDR |
418 | #define FTRACE_ADDR ((unsigned long)ftrace_caller) |
419 | #endif |
420 | |
421 | #ifndef FTRACE_REGS_ADDR |
422 | #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS |
423 | # define FTRACE_REGS_ADDR ((unsigned long)ftrace_regs_caller) |
424 | #else |
425 | # define FTRACE_REGS_ADDR FTRACE_ADDR |
426 | #endif |
427 | #endif |
428 | |
429 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
430 | extern void ftrace_graph_caller(void); |
431 | extern int ftrace_enable_ftrace_graph_caller(void); |
432 | extern int ftrace_disable_ftrace_graph_caller(void); |
433 | #else |
434 | static inline int ftrace_enable_ftrace_graph_caller(void) { return 0; } |
435 | static inline int ftrace_disable_ftrace_graph_caller(void) { return 0; } |
436 | #endif |
437 | |
438 | /** |
439 | * ftrace_make_nop - convert code into nop |
440 | * @mod: module structure if called by module load initialization |
441 | * @rec: the mcount call site record |
442 | * @addr: the address that the call site should be calling |
443 | * |
444 | * This is a very sensitive operation and great care needs |
445 | * to be taken by the arch. The operation should carefully |
446 | * read the location, check to see if what is read is indeed |
447 | * what we expect it to be, and then on success of the compare, |
448 | * it should write to the location. |
449 | * |
450 | * The code segment at @rec->ip should be a caller to @addr |
451 | * |
452 | * Return must be: |
453 | * 0 on success |
454 | * -EFAULT on error reading the location |
455 | * -EINVAL on a failed compare of the contents |
456 | * -EPERM on error writing to the location |
457 | * Any other value will be considered a failure. |
458 | */ |
459 | extern int ftrace_make_nop(struct module *mod, |
460 | struct dyn_ftrace *rec, unsigned long addr); |
461 | |
462 | /** |
463 | * ftrace_make_call - convert a nop call site into a call to addr |
464 | * @rec: the mcount call site record |
465 | * @addr: the address that the call site should call |
466 | * |
467 | * This is a very sensitive operation and great care needs |
468 | * to be taken by the arch. The operation should carefully |
469 | * read the location, check to see if what is read is indeed |
470 | * what we expect it to be, and then on success of the compare, |
471 | * it should write to the location. |
472 | * |
473 | * The code segment at @rec->ip should be a nop |
474 | * |
475 | * Return must be: |
476 | * 0 on success |
477 | * -EFAULT on error reading the location |
478 | * -EINVAL on a failed compare of the contents |
479 | * -EPERM on error writing to the location |
480 | * Any other value will be considered a failure. |
481 | */ |
482 | extern int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr); |
483 | |
484 | #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS |
485 | /** |
486 | * ftrace_modify_call - convert from one addr to another (no nop) |
487 | * @rec: the mcount call site record |
488 | * @old_addr: the address expected to be currently called to |
489 | * @addr: the address to change to |
490 | * |
491 | * This is a very sensitive operation and great care needs |
492 | * to be taken by the arch. The operation should carefully |
493 | * read the location, check to see if what is read is indeed |
494 | * what we expect it to be, and then on success of the compare, |
495 | * it should write to the location. |
496 | * |
497 | * The code segment at @rec->ip should be a caller to @old_addr |
498 | * |
499 | * Return must be: |
500 | * 0 on success |
501 | * -EFAULT on error reading the location |
502 | * -EINVAL on a failed compare of the contents |
503 | * -EPERM on error writing to the location |
504 | * Any other value will be considered a failure. |
505 | */ |
506 | extern int ftrace_modify_call(struct dyn_ftrace *rec, unsigned long old_addr, |
507 | unsigned long addr); |
508 | #else |
509 | /* Should never be called */ |
510 | static inline int ftrace_modify_call(struct dyn_ftrace *rec, unsigned long old_addr, |
511 | unsigned long addr) |
512 | { |
513 | return -EINVAL; |
514 | } |
515 | #endif |
516 | |
517 | /* May be defined in arch */ |
518 | extern int ftrace_arch_read_dyn_info(char *buf, int size); |
519 | |
520 | extern int skip_trace(unsigned long ip); |
521 | |
522 | extern void ftrace_disable_daemon(void); |
523 | extern void ftrace_enable_daemon(void); |
524 | #else /* CONFIG_DYNAMIC_FTRACE */ |
525 | static inline int skip_trace(unsigned long ip) { return 0; } |
526 | static inline int ftrace_force_update(void) { return 0; } |
527 | static inline void ftrace_disable_daemon(void) { } |
528 | static inline void ftrace_enable_daemon(void) { } |
529 | static inline void ftrace_release_mod(struct module *mod) {} |
530 | static inline int register_ftrace_command(struct ftrace_func_command *cmd) |
531 | { |
532 | return -EINVAL; |
533 | } |
534 | static inline int unregister_ftrace_command(char *cmd_name) |
535 | { |
536 | return -EINVAL; |
537 | } |
538 | static inline int ftrace_text_reserved(void *start, void *end) |
539 | { |
540 | return 0; |
541 | } |
542 | static inline unsigned long ftrace_location(unsigned long ip) |
543 | { |
544 | return 0; |
545 | } |
546 | |
547 | /* |
548 | * Again users of functions that have ftrace_ops may not |
549 | * have them defined when ftrace is not enabled, but these |
550 | * functions may still be called. Use a macro instead of inline. |
551 | */ |
552 | #define ftrace_regex_open(ops, flag, inod, file) ({ -ENODEV; }) |
553 | #define ftrace_set_early_filter(ops, buf, enable) do { } while (0) |
554 | #define ftrace_set_filter_ip(ops, ip, remove, reset) ({ -ENODEV; }) |
555 | #define ftrace_set_filter(ops, buf, len, reset) ({ -ENODEV; }) |
556 | #define ftrace_set_notrace(ops, buf, len, reset) ({ -ENODEV; }) |
557 | #define ftrace_free_filter(ops) do { } while (0) |
558 | |
559 | static inline ssize_t ftrace_filter_write(struct file *file, const char __user *ubuf, |
560 | size_t cnt, loff_t *ppos) { return -ENODEV; } |
561 | static inline ssize_t ftrace_notrace_write(struct file *file, const char __user *ubuf, |
562 | size_t cnt, loff_t *ppos) { return -ENODEV; } |
563 | static inline loff_t ftrace_regex_lseek(struct file *file, loff_t offset, int whence) |
564 | { |
565 | return -ENODEV; |
566 | } |
567 | static inline int |
568 | ftrace_regex_release(struct inode *inode, struct file *file) { return -ENODEV; } |
569 | #endif /* CONFIG_DYNAMIC_FTRACE */ |
570 | |
571 | loff_t ftrace_filter_lseek(struct file *file, loff_t offset, int whence); |
572 | |
573 | /* totally disable ftrace - can not re-enable after this */ |
574 | void ftrace_kill(void); |
575 | |
576 | static inline void tracer_disable(void) |
577 | { |
578 | #ifdef CONFIG_FUNCTION_TRACER |
579 | ftrace_enabled = 0; |
580 | #endif |
581 | } |
582 | |
583 | /* |
584 | * Ftrace disable/restore without lock. Some synchronization mechanism |
585 | * must be used to prevent ftrace_enabled to be changed between |
586 | * disable/restore. |
587 | */ |
588 | static inline int __ftrace_enabled_save(void) |
589 | { |
590 | #ifdef CONFIG_FUNCTION_TRACER |
591 | int saved_ftrace_enabled = ftrace_enabled; |
592 | ftrace_enabled = 0; |
593 | return saved_ftrace_enabled; |
594 | #else |
595 | return 0; |
596 | #endif |
597 | } |
598 | |
599 | static inline void __ftrace_enabled_restore(int enabled) |
600 | { |
601 | #ifdef CONFIG_FUNCTION_TRACER |
602 | ftrace_enabled = enabled; |
603 | #endif |
604 | } |
605 | |
606 | #ifndef HAVE_ARCH_CALLER_ADDR |
607 | # ifdef CONFIG_FRAME_POINTER |
608 | # define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0)) |
609 | # define CALLER_ADDR1 ((unsigned long)__builtin_return_address(1)) |
610 | # define CALLER_ADDR2 ((unsigned long)__builtin_return_address(2)) |
611 | # define CALLER_ADDR3 ((unsigned long)__builtin_return_address(3)) |
612 | # define CALLER_ADDR4 ((unsigned long)__builtin_return_address(4)) |
613 | # define CALLER_ADDR5 ((unsigned long)__builtin_return_address(5)) |
614 | # define CALLER_ADDR6 ((unsigned long)__builtin_return_address(6)) |
615 | # else |
616 | # define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0)) |
617 | # define CALLER_ADDR1 0UL |
618 | # define CALLER_ADDR2 0UL |
619 | # define CALLER_ADDR3 0UL |
620 | # define CALLER_ADDR4 0UL |
621 | # define CALLER_ADDR5 0UL |
622 | # define CALLER_ADDR6 0UL |
623 | # endif |
624 | #endif /* ifndef HAVE_ARCH_CALLER_ADDR */ |
625 | |
626 | #ifdef CONFIG_IRQSOFF_TRACER |
627 | extern void time_hardirqs_on(unsigned long a0, unsigned long a1); |
628 | extern void time_hardirqs_off(unsigned long a0, unsigned long a1); |
629 | #else |
630 | static inline void time_hardirqs_on(unsigned long a0, unsigned long a1) { } |
631 | static inline void time_hardirqs_off(unsigned long a0, unsigned long a1) { } |
632 | #endif |
633 | |
634 | #ifdef CONFIG_PREEMPT_TRACER |
635 | extern void trace_preempt_on(unsigned long a0, unsigned long a1); |
636 | extern void trace_preempt_off(unsigned long a0, unsigned long a1); |
637 | #else |
638 | /* |
639 | * Use defines instead of static inlines because some arches will make code out |
640 | * of the CALLER_ADDR, when we really want these to be a real nop. |
641 | */ |
642 | # define trace_preempt_on(a0, a1) do { } while (0) |
643 | # define trace_preempt_off(a0, a1) do { } while (0) |
644 | #endif |
645 | |
646 | #ifdef CONFIG_FTRACE_MCOUNT_RECORD |
647 | extern void ftrace_init(void); |
648 | #else |
649 | static inline void ftrace_init(void) { } |
650 | #endif |
651 | |
652 | /* |
653 | * Structure that defines an entry function trace. |
654 | */ |
655 | struct ftrace_graph_ent { |
656 | unsigned long func; /* Current function */ |
657 | int depth; |
658 | }; |
659 | |
660 | /* |
661 | * Structure that defines a return function trace. |
662 | */ |
663 | struct ftrace_graph_ret { |
664 | unsigned long func; /* Current function */ |
665 | unsigned long long calltime; |
666 | unsigned long long rettime; |
667 | /* Number of functions that overran the depth limit for current task */ |
668 | unsigned long overrun; |
669 | int depth; |
670 | }; |
671 | |
672 | /* Type of the callback handlers for tracing function graph*/ |
673 | typedef void (*trace_func_graph_ret_t)(struct ftrace_graph_ret *); /* return */ |
674 | typedef int (*trace_func_graph_ent_t)(struct ftrace_graph_ent *); /* entry */ |
675 | |
676 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
677 | |
678 | /* for init task */ |
679 | #define INIT_FTRACE_GRAPH .ret_stack = NULL, |
680 | |
681 | /* |
682 | * Stack of return addresses for functions |
683 | * of a thread. |
684 | * Used in struct thread_info |
685 | */ |
686 | struct ftrace_ret_stack { |
687 | unsigned long ret; |
688 | unsigned long func; |
689 | unsigned long long calltime; |
690 | unsigned long long subtime; |
691 | unsigned long fp; |
692 | }; |
693 | |
694 | /* |
695 | * Primary handler of a function return. |
696 | * It relays on ftrace_return_to_handler. |
697 | * Defined in entry_32/64.S |
698 | */ |
699 | extern void return_to_handler(void); |
700 | |
701 | extern int |
702 | ftrace_push_return_trace(unsigned long ret, unsigned long func, int *depth, |
703 | unsigned long frame_pointer); |
704 | |
705 | /* |
706 | * Sometimes we don't want to trace a function with the function |
707 | * graph tracer but we want them to keep traced by the usual function |
708 | * tracer if the function graph tracer is not configured. |
709 | */ |
710 | #define __notrace_funcgraph notrace |
711 | |
712 | /* |
713 | * We want to which function is an entrypoint of a hardirq. |
714 | * That will help us to put a signal on output. |
715 | */ |
716 | #define __irq_entry __attribute__((__section__(".irqentry.text"))) |
717 | |
718 | /* Limits of hardirq entrypoints */ |
719 | extern char __irqentry_text_start[]; |
720 | extern char __irqentry_text_end[]; |
721 | |
722 | #define FTRACE_RETFUNC_DEPTH 50 |
723 | #define FTRACE_RETSTACK_ALLOC_SIZE 32 |
724 | extern int register_ftrace_graph(trace_func_graph_ret_t retfunc, |
725 | trace_func_graph_ent_t entryfunc); |
726 | |
727 | extern void ftrace_graph_stop(void); |
728 | |
729 | /* The current handlers in use */ |
730 | extern trace_func_graph_ret_t ftrace_graph_return; |
731 | extern trace_func_graph_ent_t ftrace_graph_entry; |
732 | |
733 | extern void unregister_ftrace_graph(void); |
734 | |
735 | extern void ftrace_graph_init_task(struct task_struct *t); |
736 | extern void ftrace_graph_exit_task(struct task_struct *t); |
737 | extern void ftrace_graph_init_idle_task(struct task_struct *t, int cpu); |
738 | |
739 | static inline int task_curr_ret_stack(struct task_struct *t) |
740 | { |
741 | return t->curr_ret_stack; |
742 | } |
743 | |
744 | static inline void pause_graph_tracing(void) |
745 | { |
746 | atomic_inc(¤t->tracing_graph_pause); |
747 | } |
748 | |
749 | static inline void unpause_graph_tracing(void) |
750 | { |
751 | atomic_dec(¤t->tracing_graph_pause); |
752 | } |
753 | #else /* !CONFIG_FUNCTION_GRAPH_TRACER */ |
754 | |
755 | #define __notrace_funcgraph |
756 | #define __irq_entry |
757 | #define INIT_FTRACE_GRAPH |
758 | |
759 | static inline void ftrace_graph_init_task(struct task_struct *t) { } |
760 | static inline void ftrace_graph_exit_task(struct task_struct *t) { } |
761 | static inline void ftrace_graph_init_idle_task(struct task_struct *t, int cpu) { } |
762 | |
763 | static inline int register_ftrace_graph(trace_func_graph_ret_t retfunc, |
764 | trace_func_graph_ent_t entryfunc) |
765 | { |
766 | return -1; |
767 | } |
768 | static inline void unregister_ftrace_graph(void) { } |
769 | |
770 | static inline int task_curr_ret_stack(struct task_struct *tsk) |
771 | { |
772 | return -1; |
773 | } |
774 | |
775 | static inline void pause_graph_tracing(void) { } |
776 | static inline void unpause_graph_tracing(void) { } |
777 | #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ |
778 | |
779 | #ifdef CONFIG_TRACING |
780 | |
781 | /* flags for current->trace */ |
782 | enum { |
783 | TSK_TRACE_FL_TRACE_BIT = 0, |
784 | TSK_TRACE_FL_GRAPH_BIT = 1, |
785 | }; |
786 | enum { |
787 | TSK_TRACE_FL_TRACE = 1 << TSK_TRACE_FL_TRACE_BIT, |
788 | TSK_TRACE_FL_GRAPH = 1 << TSK_TRACE_FL_GRAPH_BIT, |
789 | }; |
790 | |
791 | static inline void set_tsk_trace_trace(struct task_struct *tsk) |
792 | { |
793 | set_bit(TSK_TRACE_FL_TRACE_BIT, &tsk->trace); |
794 | } |
795 | |
796 | static inline void clear_tsk_trace_trace(struct task_struct *tsk) |
797 | { |
798 | clear_bit(TSK_TRACE_FL_TRACE_BIT, &tsk->trace); |
799 | } |
800 | |
801 | static inline int test_tsk_trace_trace(struct task_struct *tsk) |
802 | { |
803 | return tsk->trace & TSK_TRACE_FL_TRACE; |
804 | } |
805 | |
806 | static inline void set_tsk_trace_graph(struct task_struct *tsk) |
807 | { |
808 | set_bit(TSK_TRACE_FL_GRAPH_BIT, &tsk->trace); |
809 | } |
810 | |
811 | static inline void clear_tsk_trace_graph(struct task_struct *tsk) |
812 | { |
813 | clear_bit(TSK_TRACE_FL_GRAPH_BIT, &tsk->trace); |
814 | } |
815 | |
816 | static inline int test_tsk_trace_graph(struct task_struct *tsk) |
817 | { |
818 | return tsk->trace & TSK_TRACE_FL_GRAPH; |
819 | } |
820 | |
821 | enum ftrace_dump_mode; |
822 | |
823 | extern enum ftrace_dump_mode ftrace_dump_on_oops; |
824 | |
825 | #ifdef CONFIG_PREEMPT |
826 | #define INIT_TRACE_RECURSION .trace_recursion = 0, |
827 | #endif |
828 | |
829 | #endif /* CONFIG_TRACING */ |
830 | |
831 | #ifndef INIT_TRACE_RECURSION |
832 | #define INIT_TRACE_RECURSION |
833 | #endif |
834 | |
835 | #ifdef CONFIG_FTRACE_SYSCALLS |
836 | |
837 | unsigned long arch_syscall_addr(int nr); |
838 | |
839 | #endif /* CONFIG_FTRACE_SYSCALLS */ |
840 | |
841 | #endif /* _LINUX_FTRACE_H */ |
842 |
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