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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 !ARCH_SUPPORTS_FTRACE_OPS | |
37 | # define FTRACE_FORCE_LIST_FUNC 1 | |
38 | #else | |
39 | # define FTRACE_FORCE_LIST_FUNC 0 | |
40 | #endif | |
41 | ||
42 | /* Main tracing buffer and events set up */ | |
43 | #ifdef CONFIG_TRACING | |
44 | void trace_init(void); | |
45 | #else | |
46 | static inline void trace_init(void) { } | |
47 | #endif | |
48 | ||
49 | struct module; | |
50 | struct ftrace_hash; | |
51 | ||
52 | #ifdef CONFIG_FUNCTION_TRACER | |
53 | ||
54 | extern int ftrace_enabled; | |
55 | extern int | |
56 | ftrace_enable_sysctl(struct ctl_table *table, int write, | |
57 | void __user *buffer, size_t *lenp, | |
58 | loff_t *ppos); | |
59 | ||
60 | struct ftrace_ops; | |
61 | ||
62 | typedef void (*ftrace_func_t)(unsigned long ip, unsigned long parent_ip, | |
63 | struct ftrace_ops *op, struct pt_regs *regs); | |
64 | ||
65 | ftrace_func_t ftrace_ops_get_func(struct ftrace_ops *ops); | |
66 | ||
67 | /* | |
68 | * FTRACE_OPS_FL_* bits denote the state of ftrace_ops struct and are | |
69 | * set in the flags member. | |
70 | * CONTROL, SAVE_REGS, SAVE_REGS_IF_SUPPORTED, RECURSION_SAFE, STUB and | |
71 | * IPMODIFY are a kind of attribute flags which can be set only before | |
72 | * registering the ftrace_ops, and can not be modified while registered. | |
73 | * Changing those attribute flags after regsitering ftrace_ops will | |
74 | * cause unexpected results. | |
75 | * | |
76 | * ENABLED - set/unset when ftrace_ops is registered/unregistered | |
77 | * DYNAMIC - set when ftrace_ops is registered to denote dynamically | |
78 | * allocated ftrace_ops which need special care | |
79 | * PER_CPU - set manualy by ftrace_ops user to denote the ftrace_ops | |
80 | * could be controlled by following calls: | |
81 | * ftrace_function_local_enable | |
82 | * ftrace_function_local_disable | |
83 | * SAVE_REGS - The ftrace_ops wants regs saved at each function called | |
84 | * and passed to the callback. If this flag is set, but the | |
85 | * architecture does not support passing regs | |
86 | * (CONFIG_DYNAMIC_FTRACE_WITH_REGS is not defined), then the | |
87 | * ftrace_ops will fail to register, unless the next flag | |
88 | * is set. | |
89 | * SAVE_REGS_IF_SUPPORTED - This is the same as SAVE_REGS, but if the | |
90 | * handler can handle an arch that does not save regs | |
91 | * (the handler tests if regs == NULL), then it can set | |
92 | * this flag instead. It will not fail registering the ftrace_ops | |
93 | * but, the regs field will be NULL if the arch does not support | |
94 | * passing regs to the handler. | |
95 | * Note, if this flag is set, the SAVE_REGS flag will automatically | |
96 | * get set upon registering the ftrace_ops, if the arch supports it. | |
97 | * RECURSION_SAFE - The ftrace_ops can set this to tell the ftrace infrastructure | |
98 | * that the call back has its own recursion protection. If it does | |
99 | * not set this, then the ftrace infrastructure will add recursion | |
100 | * protection for the caller. | |
101 | * STUB - The ftrace_ops is just a place holder. | |
102 | * INITIALIZED - The ftrace_ops has already been initialized (first use time | |
103 | * register_ftrace_function() is called, it will initialized the ops) | |
104 | * DELETED - The ops are being deleted, do not let them be registered again. | |
105 | * ADDING - The ops is in the process of being added. | |
106 | * REMOVING - The ops is in the process of being removed. | |
107 | * MODIFYING - The ops is in the process of changing its filter functions. | |
108 | * ALLOC_TRAMP - A dynamic trampoline was allocated by the core code. | |
109 | * The arch specific code sets this flag when it allocated a | |
110 | * trampoline. This lets the arch know that it can update the | |
111 | * trampoline in case the callback function changes. | |
112 | * The ftrace_ops trampoline can be set by the ftrace users, and | |
113 | * in such cases the arch must not modify it. Only the arch ftrace | |
114 | * core code should set this flag. | |
115 | * IPMODIFY - The ops can modify the IP register. This can only be set with | |
116 | * SAVE_REGS. If another ops with this flag set is already registered | |
117 | * for any of the functions that this ops will be registered for, then | |
118 | * this ops will fail to register or set_filter_ip. | |
119 | * PID - Is affected by set_ftrace_pid (allows filtering on those pids) | |
120 | */ | |
121 | enum { | |
122 | FTRACE_OPS_FL_ENABLED = 1 << 0, | |
123 | FTRACE_OPS_FL_DYNAMIC = 1 << 1, | |
124 | FTRACE_OPS_FL_PER_CPU = 1 << 2, | |
125 | FTRACE_OPS_FL_SAVE_REGS = 1 << 3, | |
126 | FTRACE_OPS_FL_SAVE_REGS_IF_SUPPORTED = 1 << 4, | |
127 | FTRACE_OPS_FL_RECURSION_SAFE = 1 << 5, | |
128 | FTRACE_OPS_FL_STUB = 1 << 6, | |
129 | FTRACE_OPS_FL_INITIALIZED = 1 << 7, | |
130 | FTRACE_OPS_FL_DELETED = 1 << 8, | |
131 | FTRACE_OPS_FL_ADDING = 1 << 9, | |
132 | FTRACE_OPS_FL_REMOVING = 1 << 10, | |
133 | FTRACE_OPS_FL_MODIFYING = 1 << 11, | |
134 | FTRACE_OPS_FL_ALLOC_TRAMP = 1 << 12, | |
135 | FTRACE_OPS_FL_IPMODIFY = 1 << 13, | |
136 | FTRACE_OPS_FL_PID = 1 << 14, | |
137 | FTRACE_OPS_FL_RCU = 1 << 15, | |
138 | }; | |
139 | ||
140 | #ifdef CONFIG_DYNAMIC_FTRACE | |
141 | /* The hash used to know what functions callbacks trace */ | |
142 | struct ftrace_ops_hash { | |
143 | struct ftrace_hash *notrace_hash; | |
144 | struct ftrace_hash *filter_hash; | |
145 | struct mutex regex_lock; | |
146 | }; | |
147 | #endif | |
148 | ||
149 | /* | |
150 | * Note, ftrace_ops can be referenced outside of RCU protection, unless | |
151 | * the RCU flag is set. If ftrace_ops is allocated and not part of kernel | |
152 | * core data, the unregistering of it will perform a scheduling on all CPUs | |
153 | * to make sure that there are no more users. Depending on the load of the | |
154 | * system that may take a bit of time. | |
155 | * | |
156 | * Any private data added must also take care not to be freed and if private | |
157 | * data is added to a ftrace_ops that is in core code, the user of the | |
158 | * ftrace_ops must perform a schedule_on_each_cpu() before freeing it. | |
159 | */ | |
160 | struct ftrace_ops { | |
161 | ftrace_func_t func; | |
162 | struct ftrace_ops *next; | |
163 | unsigned long flags; | |
164 | void *private; | |
165 | ftrace_func_t saved_func; | |
166 | int __percpu *disabled; | |
167 | #ifdef CONFIG_DYNAMIC_FTRACE | |
168 | struct ftrace_ops_hash local_hash; | |
169 | struct ftrace_ops_hash *func_hash; | |
170 | struct ftrace_ops_hash old_hash; | |
171 | unsigned long trampoline; | |
172 | unsigned long trampoline_size; | |
173 | #endif | |
174 | }; | |
175 | ||
176 | /* | |
177 | * Type of the current tracing. | |
178 | */ | |
179 | enum ftrace_tracing_type_t { | |
180 | FTRACE_TYPE_ENTER = 0, /* Hook the call of the function */ | |
181 | FTRACE_TYPE_RETURN, /* Hook the return of the function */ | |
182 | }; | |
183 | ||
184 | /* Current tracing type, default is FTRACE_TYPE_ENTER */ | |
185 | extern enum ftrace_tracing_type_t ftrace_tracing_type; | |
186 | ||
187 | /* | |
188 | * The ftrace_ops must be a static and should also | |
189 | * be read_mostly. These functions do modify read_mostly variables | |
190 | * so use them sparely. Never free an ftrace_op or modify the | |
191 | * next pointer after it has been registered. Even after unregistering | |
192 | * it, the next pointer may still be used internally. | |
193 | */ | |
194 | int register_ftrace_function(struct ftrace_ops *ops); | |
195 | int unregister_ftrace_function(struct ftrace_ops *ops); | |
196 | void clear_ftrace_function(void); | |
197 | ||
198 | /** | |
199 | * ftrace_function_local_enable - enable ftrace_ops on current cpu | |
200 | * | |
201 | * This function enables tracing on current cpu by decreasing | |
202 | * the per cpu control variable. | |
203 | * It must be called with preemption disabled and only on ftrace_ops | |
204 | * registered with FTRACE_OPS_FL_PER_CPU. If called without preemption | |
205 | * disabled, this_cpu_ptr will complain when CONFIG_DEBUG_PREEMPT is enabled. | |
206 | */ | |
207 | static inline void ftrace_function_local_enable(struct ftrace_ops *ops) | |
208 | { | |
209 | if (WARN_ON_ONCE(!(ops->flags & FTRACE_OPS_FL_PER_CPU))) | |
210 | return; | |
211 | ||
212 | (*this_cpu_ptr(ops->disabled))--; | |
213 | } | |
214 | ||
215 | /** | |
216 | * ftrace_function_local_disable - disable ftrace_ops on current cpu | |
217 | * | |
218 | * This function disables tracing on current cpu by increasing | |
219 | * the per cpu control variable. | |
220 | * It must be called with preemption disabled and only on ftrace_ops | |
221 | * registered with FTRACE_OPS_FL_PER_CPU. If called without preemption | |
222 | * disabled, this_cpu_ptr will complain when CONFIG_DEBUG_PREEMPT is enabled. | |
223 | */ | |
224 | static inline void ftrace_function_local_disable(struct ftrace_ops *ops) | |
225 | { | |
226 | if (WARN_ON_ONCE(!(ops->flags & FTRACE_OPS_FL_PER_CPU))) | |
227 | return; | |
228 | ||
229 | (*this_cpu_ptr(ops->disabled))++; | |
230 | } | |
231 | ||
232 | /** | |
233 | * ftrace_function_local_disabled - returns ftrace_ops disabled value | |
234 | * on current cpu | |
235 | * | |
236 | * This function returns value of ftrace_ops::disabled on current cpu. | |
237 | * It must be called with preemption disabled and only on ftrace_ops | |
238 | * registered with FTRACE_OPS_FL_PER_CPU. If called without preemption | |
239 | * disabled, this_cpu_ptr will complain when CONFIG_DEBUG_PREEMPT is enabled. | |
240 | */ | |
241 | static inline int ftrace_function_local_disabled(struct ftrace_ops *ops) | |
242 | { | |
243 | WARN_ON_ONCE(!(ops->flags & FTRACE_OPS_FL_PER_CPU)); | |
244 | return *this_cpu_ptr(ops->disabled); | |
245 | } | |
246 | ||
247 | extern void ftrace_stub(unsigned long a0, unsigned long a1, | |
248 | struct ftrace_ops *op, struct pt_regs *regs); | |
249 | ||
250 | #else /* !CONFIG_FUNCTION_TRACER */ | |
251 | /* | |
252 | * (un)register_ftrace_function must be a macro since the ops parameter | |
253 | * must not be evaluated. | |
254 | */ | |
255 | #define register_ftrace_function(ops) ({ 0; }) | |
256 | #define unregister_ftrace_function(ops) ({ 0; }) | |
257 | static inline int ftrace_nr_registered_ops(void) | |
258 | { | |
259 | return 0; | |
260 | } | |
261 | static inline void clear_ftrace_function(void) { } | |
262 | static inline void ftrace_kill(void) { } | |
263 | #endif /* CONFIG_FUNCTION_TRACER */ | |
264 | ||
265 | #ifdef CONFIG_STACK_TRACER | |
266 | ||
267 | #define STACK_TRACE_ENTRIES 500 | |
268 | ||
269 | struct stack_trace; | |
270 | ||
271 | extern unsigned stack_trace_index[]; | |
272 | extern struct stack_trace stack_trace_max; | |
273 | extern unsigned long stack_trace_max_size; | |
274 | extern arch_spinlock_t stack_trace_max_lock; | |
275 | ||
276 | extern int stack_tracer_enabled; | |
277 | void stack_trace_print(void); | |
278 | int | |
279 | stack_trace_sysctl(struct ctl_table *table, int write, | |
280 | void __user *buffer, size_t *lenp, | |
281 | loff_t *ppos); | |
282 | #endif | |
283 | ||
284 | struct ftrace_func_command { | |
285 | struct list_head list; | |
286 | char *name; | |
287 | int (*func)(struct ftrace_hash *hash, | |
288 | char *func, char *cmd, | |
289 | char *params, int enable); | |
290 | }; | |
291 | ||
292 | #ifdef CONFIG_DYNAMIC_FTRACE | |
293 | ||
294 | int ftrace_arch_code_modify_prepare(void); | |
295 | int ftrace_arch_code_modify_post_process(void); | |
296 | ||
297 | struct dyn_ftrace; | |
298 | ||
299 | enum ftrace_bug_type { | |
300 | FTRACE_BUG_UNKNOWN, | |
301 | FTRACE_BUG_INIT, | |
302 | FTRACE_BUG_NOP, | |
303 | FTRACE_BUG_CALL, | |
304 | FTRACE_BUG_UPDATE, | |
305 | }; | |
306 | extern enum ftrace_bug_type ftrace_bug_type; | |
307 | ||
308 | /* | |
309 | * Archs can set this to point to a variable that holds the value that was | |
310 | * expected at the call site before calling ftrace_bug(). | |
311 | */ | |
312 | extern const void *ftrace_expected; | |
313 | ||
314 | void ftrace_bug(int err, struct dyn_ftrace *rec); | |
315 | ||
316 | struct seq_file; | |
317 | ||
318 | struct ftrace_probe_ops { | |
319 | void (*func)(unsigned long ip, | |
320 | unsigned long parent_ip, | |
321 | void **data); | |
322 | int (*init)(struct ftrace_probe_ops *ops, | |
323 | unsigned long ip, void **data); | |
324 | void (*free)(struct ftrace_probe_ops *ops, | |
325 | unsigned long ip, void **data); | |
326 | int (*print)(struct seq_file *m, | |
327 | unsigned long ip, | |
328 | struct ftrace_probe_ops *ops, | |
329 | void *data); | |
330 | }; | |
331 | ||
332 | extern int | |
333 | register_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops, | |
334 | void *data); | |
335 | extern void | |
336 | unregister_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops, | |
337 | void *data); | |
338 | extern void | |
339 | unregister_ftrace_function_probe_func(char *glob, struct ftrace_probe_ops *ops); | |
340 | extern void unregister_ftrace_function_probe_all(char *glob); | |
341 | ||
342 | extern int ftrace_text_reserved(const void *start, const void *end); | |
343 | ||
344 | extern int ftrace_nr_registered_ops(void); | |
345 | ||
346 | bool is_ftrace_trampoline(unsigned long addr); | |
347 | ||
348 | /* | |
349 | * The dyn_ftrace record's flags field is split into two parts. | |
350 | * the first part which is '0-FTRACE_REF_MAX' is a counter of | |
351 | * the number of callbacks that have registered the function that | |
352 | * the dyn_ftrace descriptor represents. | |
353 | * | |
354 | * The second part is a mask: | |
355 | * ENABLED - the function is being traced | |
356 | * REGS - the record wants the function to save regs | |
357 | * REGS_EN - the function is set up to save regs. | |
358 | * IPMODIFY - the record allows for the IP address to be changed. | |
359 | * DISABLED - the record is not ready to be touched yet | |
360 | * | |
361 | * When a new ftrace_ops is registered and wants a function to save | |
362 | * pt_regs, the rec->flag REGS is set. When the function has been | |
363 | * set up to save regs, the REG_EN flag is set. Once a function | |
364 | * starts saving regs it will do so until all ftrace_ops are removed | |
365 | * from tracing that function. | |
366 | */ | |
367 | enum { | |
368 | FTRACE_FL_ENABLED = (1UL << 31), | |
369 | FTRACE_FL_REGS = (1UL << 30), | |
370 | FTRACE_FL_REGS_EN = (1UL << 29), | |
371 | FTRACE_FL_TRAMP = (1UL << 28), | |
372 | FTRACE_FL_TRAMP_EN = (1UL << 27), | |
373 | FTRACE_FL_IPMODIFY = (1UL << 26), | |
374 | FTRACE_FL_DISABLED = (1UL << 25), | |
375 | }; | |
376 | ||
377 | #define FTRACE_REF_MAX_SHIFT 25 | |
378 | #define FTRACE_FL_BITS 7 | |
379 | #define FTRACE_FL_MASKED_BITS ((1UL << FTRACE_FL_BITS) - 1) | |
380 | #define FTRACE_FL_MASK (FTRACE_FL_MASKED_BITS << FTRACE_REF_MAX_SHIFT) | |
381 | #define FTRACE_REF_MAX ((1UL << FTRACE_REF_MAX_SHIFT) - 1) | |
382 | ||
383 | #define ftrace_rec_count(rec) ((rec)->flags & ~FTRACE_FL_MASK) | |
384 | ||
385 | struct dyn_ftrace { | |
386 | unsigned long ip; /* address of mcount call-site */ | |
387 | unsigned long flags; | |
388 | struct dyn_arch_ftrace arch; | |
389 | }; | |
390 | ||
391 | int ftrace_force_update(void); | |
392 | int ftrace_set_filter_ip(struct ftrace_ops *ops, unsigned long ip, | |
393 | int remove, int reset); | |
394 | int ftrace_set_filter(struct ftrace_ops *ops, unsigned char *buf, | |
395 | int len, int reset); | |
396 | int ftrace_set_notrace(struct ftrace_ops *ops, unsigned char *buf, | |
397 | int len, int reset); | |
398 | void ftrace_set_global_filter(unsigned char *buf, int len, int reset); | |
399 | void ftrace_set_global_notrace(unsigned char *buf, int len, int reset); | |
400 | void ftrace_free_filter(struct ftrace_ops *ops); | |
401 | ||
402 | int register_ftrace_command(struct ftrace_func_command *cmd); | |
403 | int unregister_ftrace_command(struct ftrace_func_command *cmd); | |
404 | ||
405 | enum { | |
406 | FTRACE_UPDATE_CALLS = (1 << 0), | |
407 | FTRACE_DISABLE_CALLS = (1 << 1), | |
408 | FTRACE_UPDATE_TRACE_FUNC = (1 << 2), | |
409 | FTRACE_START_FUNC_RET = (1 << 3), | |
410 | FTRACE_STOP_FUNC_RET = (1 << 4), | |
411 | }; | |
412 | ||
413 | /* | |
414 | * The FTRACE_UPDATE_* enum is used to pass information back | |
415 | * from the ftrace_update_record() and ftrace_test_record() | |
416 | * functions. These are called by the code update routines | |
417 | * to find out what is to be done for a given function. | |
418 | * | |
419 | * IGNORE - The function is already what we want it to be | |
420 | * MAKE_CALL - Start tracing the function | |
421 | * MODIFY_CALL - Stop saving regs for the function | |
422 | * MAKE_NOP - Stop tracing the function | |
423 | */ | |
424 | enum { | |
425 | FTRACE_UPDATE_IGNORE, | |
426 | FTRACE_UPDATE_MAKE_CALL, | |
427 | FTRACE_UPDATE_MODIFY_CALL, | |
428 | FTRACE_UPDATE_MAKE_NOP, | |
429 | }; | |
430 | ||
431 | enum { | |
432 | FTRACE_ITER_FILTER = (1 << 0), | |
433 | FTRACE_ITER_NOTRACE = (1 << 1), | |
434 | FTRACE_ITER_PRINTALL = (1 << 2), | |
435 | FTRACE_ITER_DO_HASH = (1 << 3), | |
436 | FTRACE_ITER_HASH = (1 << 4), | |
437 | FTRACE_ITER_ENABLED = (1 << 5), | |
438 | }; | |
439 | ||
440 | void arch_ftrace_update_code(int command); | |
441 | ||
442 | struct ftrace_rec_iter; | |
443 | ||
444 | struct ftrace_rec_iter *ftrace_rec_iter_start(void); | |
445 | struct ftrace_rec_iter *ftrace_rec_iter_next(struct ftrace_rec_iter *iter); | |
446 | struct dyn_ftrace *ftrace_rec_iter_record(struct ftrace_rec_iter *iter); | |
447 | ||
448 | #define for_ftrace_rec_iter(iter) \ | |
449 | for (iter = ftrace_rec_iter_start(); \ | |
450 | iter; \ | |
451 | iter = ftrace_rec_iter_next(iter)) | |
452 | ||
453 | ||
454 | int ftrace_update_record(struct dyn_ftrace *rec, int enable); | |
455 | int ftrace_test_record(struct dyn_ftrace *rec, int enable); | |
456 | void ftrace_run_stop_machine(int command); | |
457 | unsigned long ftrace_location(unsigned long ip); | |
458 | unsigned long ftrace_location_range(unsigned long start, unsigned long end); | |
459 | unsigned long ftrace_get_addr_new(struct dyn_ftrace *rec); | |
460 | unsigned long ftrace_get_addr_curr(struct dyn_ftrace *rec); | |
461 | ||
462 | extern ftrace_func_t ftrace_trace_function; | |
463 | ||
464 | int ftrace_regex_open(struct ftrace_ops *ops, int flag, | |
465 | struct inode *inode, struct file *file); | |
466 | ssize_t ftrace_filter_write(struct file *file, const char __user *ubuf, | |
467 | size_t cnt, loff_t *ppos); | |
468 | ssize_t ftrace_notrace_write(struct file *file, const char __user *ubuf, | |
469 | size_t cnt, loff_t *ppos); | |
470 | int ftrace_regex_release(struct inode *inode, struct file *file); | |
471 | ||
472 | void __init | |
473 | ftrace_set_early_filter(struct ftrace_ops *ops, char *buf, int enable); | |
474 | ||
475 | /* defined in arch */ | |
476 | extern int ftrace_ip_converted(unsigned long ip); | |
477 | extern int ftrace_dyn_arch_init(void); | |
478 | extern void ftrace_replace_code(int enable); | |
479 | extern int ftrace_update_ftrace_func(ftrace_func_t func); | |
480 | extern void ftrace_caller(void); | |
481 | extern void ftrace_regs_caller(void); | |
482 | extern void ftrace_call(void); | |
483 | extern void ftrace_regs_call(void); | |
484 | extern void mcount_call(void); | |
485 | ||
486 | void ftrace_modify_all_code(int command); | |
487 | ||
488 | #ifndef FTRACE_ADDR | |
489 | #define FTRACE_ADDR ((unsigned long)ftrace_caller) | |
490 | #endif | |
491 | ||
492 | #ifndef FTRACE_GRAPH_ADDR | |
493 | #define FTRACE_GRAPH_ADDR ((unsigned long)ftrace_graph_caller) | |
494 | #endif | |
495 | ||
496 | #ifndef FTRACE_REGS_ADDR | |
497 | #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS | |
498 | # define FTRACE_REGS_ADDR ((unsigned long)ftrace_regs_caller) | |
499 | #else | |
500 | # define FTRACE_REGS_ADDR FTRACE_ADDR | |
501 | #endif | |
502 | #endif | |
503 | ||
504 | /* | |
505 | * If an arch would like functions that are only traced | |
506 | * by the function graph tracer to jump directly to its own | |
507 | * trampoline, then they can define FTRACE_GRAPH_TRAMP_ADDR | |
508 | * to be that address to jump to. | |
509 | */ | |
510 | #ifndef FTRACE_GRAPH_TRAMP_ADDR | |
511 | #define FTRACE_GRAPH_TRAMP_ADDR ((unsigned long) 0) | |
512 | #endif | |
513 | ||
514 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER | |
515 | extern void ftrace_graph_caller(void); | |
516 | extern int ftrace_enable_ftrace_graph_caller(void); | |
517 | extern int ftrace_disable_ftrace_graph_caller(void); | |
518 | #else | |
519 | static inline int ftrace_enable_ftrace_graph_caller(void) { return 0; } | |
520 | static inline int ftrace_disable_ftrace_graph_caller(void) { return 0; } | |
521 | #endif | |
522 | ||
523 | /** | |
524 | * ftrace_make_nop - convert code into nop | |
525 | * @mod: module structure if called by module load initialization | |
526 | * @rec: the mcount call site record | |
527 | * @addr: the address that the call site should be calling | |
528 | * | |
529 | * This is a very sensitive operation and great care needs | |
530 | * to be taken by the arch. The operation should carefully | |
531 | * read the location, check to see if what is read is indeed | |
532 | * what we expect it to be, and then on success of the compare, | |
533 | * it should write to the location. | |
534 | * | |
535 | * The code segment at @rec->ip should be a caller to @addr | |
536 | * | |
537 | * Return must be: | |
538 | * 0 on success | |
539 | * -EFAULT on error reading the location | |
540 | * -EINVAL on a failed compare of the contents | |
541 | * -EPERM on error writing to the location | |
542 | * Any other value will be considered a failure. | |
543 | */ | |
544 | extern int ftrace_make_nop(struct module *mod, | |
545 | struct dyn_ftrace *rec, unsigned long addr); | |
546 | ||
547 | /** | |
548 | * ftrace_make_call - convert a nop call site into a call to addr | |
549 | * @rec: the mcount call site record | |
550 | * @addr: the address that the call site should call | |
551 | * | |
552 | * This is a very sensitive operation and great care needs | |
553 | * to be taken by the arch. The operation should carefully | |
554 | * read the location, check to see if what is read is indeed | |
555 | * what we expect it to be, and then on success of the compare, | |
556 | * it should write to the location. | |
557 | * | |
558 | * The code segment at @rec->ip should be a nop | |
559 | * | |
560 | * Return must be: | |
561 | * 0 on success | |
562 | * -EFAULT on error reading the location | |
563 | * -EINVAL on a failed compare of the contents | |
564 | * -EPERM on error writing to the location | |
565 | * Any other value will be considered a failure. | |
566 | */ | |
567 | extern int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr); | |
568 | ||
569 | #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS | |
570 | /** | |
571 | * ftrace_modify_call - convert from one addr to another (no nop) | |
572 | * @rec: the mcount call site record | |
573 | * @old_addr: the address expected to be currently called to | |
574 | * @addr: the address to change to | |
575 | * | |
576 | * This is a very sensitive operation and great care needs | |
577 | * to be taken by the arch. The operation should carefully | |
578 | * read the location, check to see if what is read is indeed | |
579 | * what we expect it to be, and then on success of the compare, | |
580 | * it should write to the location. | |
581 | * | |
582 | * The code segment at @rec->ip should be a caller to @old_addr | |
583 | * | |
584 | * Return must be: | |
585 | * 0 on success | |
586 | * -EFAULT on error reading the location | |
587 | * -EINVAL on a failed compare of the contents | |
588 | * -EPERM on error writing to the location | |
589 | * Any other value will be considered a failure. | |
590 | */ | |
591 | extern int ftrace_modify_call(struct dyn_ftrace *rec, unsigned long old_addr, | |
592 | unsigned long addr); | |
593 | #else | |
594 | /* Should never be called */ | |
595 | static inline int ftrace_modify_call(struct dyn_ftrace *rec, unsigned long old_addr, | |
596 | unsigned long addr) | |
597 | { | |
598 | return -EINVAL; | |
599 | } | |
600 | #endif | |
601 | ||
602 | /* May be defined in arch */ | |
603 | extern int ftrace_arch_read_dyn_info(char *buf, int size); | |
604 | ||
605 | extern int skip_trace(unsigned long ip); | |
606 | extern void ftrace_module_init(struct module *mod); | |
607 | extern void ftrace_module_enable(struct module *mod); | |
608 | extern void ftrace_release_mod(struct module *mod); | |
609 | ||
610 | extern void ftrace_disable_daemon(void); | |
611 | extern void ftrace_enable_daemon(void); | |
612 | #else /* CONFIG_DYNAMIC_FTRACE */ | |
613 | static inline int skip_trace(unsigned long ip) { return 0; } | |
614 | static inline int ftrace_force_update(void) { return 0; } | |
615 | static inline void ftrace_disable_daemon(void) { } | |
616 | static inline void ftrace_enable_daemon(void) { } | |
617 | static inline void ftrace_module_init(struct module *mod) { } | |
618 | static inline void ftrace_module_enable(struct module *mod) { } | |
619 | static inline void ftrace_release_mod(struct module *mod) { } | |
620 | static inline __init int register_ftrace_command(struct ftrace_func_command *cmd) | |
621 | { | |
622 | return -EINVAL; | |
623 | } | |
624 | static inline __init int unregister_ftrace_command(char *cmd_name) | |
625 | { | |
626 | return -EINVAL; | |
627 | } | |
628 | static inline int ftrace_text_reserved(const void *start, const void *end) | |
629 | { | |
630 | return 0; | |
631 | } | |
632 | static inline unsigned long ftrace_location(unsigned long ip) | |
633 | { | |
634 | return 0; | |
635 | } | |
636 | ||
637 | /* | |
638 | * Again users of functions that have ftrace_ops may not | |
639 | * have them defined when ftrace is not enabled, but these | |
640 | * functions may still be called. Use a macro instead of inline. | |
641 | */ | |
642 | #define ftrace_regex_open(ops, flag, inod, file) ({ -ENODEV; }) | |
643 | #define ftrace_set_early_filter(ops, buf, enable) do { } while (0) | |
644 | #define ftrace_set_filter_ip(ops, ip, remove, reset) ({ -ENODEV; }) | |
645 | #define ftrace_set_filter(ops, buf, len, reset) ({ -ENODEV; }) | |
646 | #define ftrace_set_notrace(ops, buf, len, reset) ({ -ENODEV; }) | |
647 | #define ftrace_free_filter(ops) do { } while (0) | |
648 | ||
649 | static inline ssize_t ftrace_filter_write(struct file *file, const char __user *ubuf, | |
650 | size_t cnt, loff_t *ppos) { return -ENODEV; } | |
651 | static inline ssize_t ftrace_notrace_write(struct file *file, const char __user *ubuf, | |
652 | size_t cnt, loff_t *ppos) { return -ENODEV; } | |
653 | static inline int | |
654 | ftrace_regex_release(struct inode *inode, struct file *file) { return -ENODEV; } | |
655 | ||
656 | static inline bool is_ftrace_trampoline(unsigned long addr) | |
657 | { | |
658 | return false; | |
659 | } | |
660 | #endif /* CONFIG_DYNAMIC_FTRACE */ | |
661 | ||
662 | /* totally disable ftrace - can not re-enable after this */ | |
663 | void ftrace_kill(void); | |
664 | ||
665 | static inline void tracer_disable(void) | |
666 | { | |
667 | #ifdef CONFIG_FUNCTION_TRACER | |
668 | ftrace_enabled = 0; | |
669 | #endif | |
670 | } | |
671 | ||
672 | /* | |
673 | * Ftrace disable/restore without lock. Some synchronization mechanism | |
674 | * must be used to prevent ftrace_enabled to be changed between | |
675 | * disable/restore. | |
676 | */ | |
677 | static inline int __ftrace_enabled_save(void) | |
678 | { | |
679 | #ifdef CONFIG_FUNCTION_TRACER | |
680 | int saved_ftrace_enabled = ftrace_enabled; | |
681 | ftrace_enabled = 0; | |
682 | return saved_ftrace_enabled; | |
683 | #else | |
684 | return 0; | |
685 | #endif | |
686 | } | |
687 | ||
688 | static inline void __ftrace_enabled_restore(int enabled) | |
689 | { | |
690 | #ifdef CONFIG_FUNCTION_TRACER | |
691 | ftrace_enabled = enabled; | |
692 | #endif | |
693 | } | |
694 | ||
695 | /* All archs should have this, but we define it for consistency */ | |
696 | #ifndef ftrace_return_address0 | |
697 | # define ftrace_return_address0 __builtin_return_address(0) | |
698 | #endif | |
699 | ||
700 | /* Archs may use other ways for ADDR1 and beyond */ | |
701 | #ifndef ftrace_return_address | |
702 | # ifdef CONFIG_FRAME_POINTER | |
703 | # define ftrace_return_address(n) __builtin_return_address(n) | |
704 | # else | |
705 | # define ftrace_return_address(n) 0UL | |
706 | # endif | |
707 | #endif | |
708 | ||
709 | #define CALLER_ADDR0 ((unsigned long)ftrace_return_address0) | |
710 | #define CALLER_ADDR1 ((unsigned long)ftrace_return_address(1)) | |
711 | #define CALLER_ADDR2 ((unsigned long)ftrace_return_address(2)) | |
712 | #define CALLER_ADDR3 ((unsigned long)ftrace_return_address(3)) | |
713 | #define CALLER_ADDR4 ((unsigned long)ftrace_return_address(4)) | |
714 | #define CALLER_ADDR5 ((unsigned long)ftrace_return_address(5)) | |
715 | #define CALLER_ADDR6 ((unsigned long)ftrace_return_address(6)) | |
716 | ||
717 | static inline unsigned long get_lock_parent_ip(void) | |
718 | { | |
719 | unsigned long addr = CALLER_ADDR0; | |
720 | ||
721 | if (!in_lock_functions(addr)) | |
722 | return addr; | |
723 | addr = CALLER_ADDR1; | |
724 | if (!in_lock_functions(addr)) | |
725 | return addr; | |
726 | return CALLER_ADDR2; | |
727 | } | |
728 | ||
729 | #ifdef CONFIG_IRQSOFF_TRACER | |
730 | extern void time_hardirqs_on(unsigned long a0, unsigned long a1); | |
731 | extern void time_hardirqs_off(unsigned long a0, unsigned long a1); | |
732 | #else | |
733 | static inline void time_hardirqs_on(unsigned long a0, unsigned long a1) { } | |
734 | static inline void time_hardirqs_off(unsigned long a0, unsigned long a1) { } | |
735 | #endif | |
736 | ||
737 | #ifdef CONFIG_PREEMPT_TRACER | |
738 | extern void trace_preempt_on(unsigned long a0, unsigned long a1); | |
739 | extern void trace_preempt_off(unsigned long a0, unsigned long a1); | |
740 | #else | |
741 | /* | |
742 | * Use defines instead of static inlines because some arches will make code out | |
743 | * of the CALLER_ADDR, when we really want these to be a real nop. | |
744 | */ | |
745 | # define trace_preempt_on(a0, a1) do { } while (0) | |
746 | # define trace_preempt_off(a0, a1) do { } while (0) | |
747 | #endif | |
748 | ||
749 | #ifdef CONFIG_FTRACE_MCOUNT_RECORD | |
750 | extern void ftrace_init(void); | |
751 | #else | |
752 | static inline void ftrace_init(void) { } | |
753 | #endif | |
754 | ||
755 | /* | |
756 | * Structure that defines an entry function trace. | |
757 | */ | |
758 | struct ftrace_graph_ent { | |
759 | unsigned long func; /* Current function */ | |
760 | int depth; | |
761 | }; | |
762 | ||
763 | /* | |
764 | * Structure that defines a return function trace. | |
765 | */ | |
766 | struct ftrace_graph_ret { | |
767 | unsigned long func; /* Current function */ | |
768 | unsigned long long calltime; | |
769 | unsigned long long rettime; | |
770 | /* Number of functions that overran the depth limit for current task */ | |
771 | unsigned long overrun; | |
772 | int depth; | |
773 | }; | |
774 | ||
775 | /* Type of the callback handlers for tracing function graph*/ | |
776 | typedef void (*trace_func_graph_ret_t)(struct ftrace_graph_ret *); /* return */ | |
777 | typedef int (*trace_func_graph_ent_t)(struct ftrace_graph_ent *); /* entry */ | |
778 | ||
779 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER | |
780 | ||
781 | /* for init task */ | |
782 | #define INIT_FTRACE_GRAPH .ret_stack = NULL, | |
783 | ||
784 | /* | |
785 | * Stack of return addresses for functions | |
786 | * of a thread. | |
787 | * Used in struct thread_info | |
788 | */ | |
789 | struct ftrace_ret_stack { | |
790 | unsigned long ret; | |
791 | unsigned long func; | |
792 | unsigned long long calltime; | |
793 | unsigned long long subtime; | |
794 | unsigned long fp; | |
795 | }; | |
796 | ||
797 | /* | |
798 | * Primary handler of a function return. | |
799 | * It relays on ftrace_return_to_handler. | |
800 | * Defined in entry_32/64.S | |
801 | */ | |
802 | extern void return_to_handler(void); | |
803 | ||
804 | extern int | |
805 | ftrace_push_return_trace(unsigned long ret, unsigned long func, int *depth, | |
806 | unsigned long frame_pointer); | |
807 | ||
808 | /* | |
809 | * Sometimes we don't want to trace a function with the function | |
810 | * graph tracer but we want them to keep traced by the usual function | |
811 | * tracer if the function graph tracer is not configured. | |
812 | */ | |
813 | #define __notrace_funcgraph notrace | |
814 | ||
815 | #define FTRACE_NOTRACE_DEPTH 65536 | |
816 | #define FTRACE_RETFUNC_DEPTH 50 | |
817 | #define FTRACE_RETSTACK_ALLOC_SIZE 32 | |
818 | extern int register_ftrace_graph(trace_func_graph_ret_t retfunc, | |
819 | trace_func_graph_ent_t entryfunc); | |
820 | ||
821 | extern bool ftrace_graph_is_dead(void); | |
822 | extern void ftrace_graph_stop(void); | |
823 | ||
824 | /* The current handlers in use */ | |
825 | extern trace_func_graph_ret_t ftrace_graph_return; | |
826 | extern trace_func_graph_ent_t ftrace_graph_entry; | |
827 | ||
828 | extern void unregister_ftrace_graph(void); | |
829 | ||
830 | extern void ftrace_graph_init_task(struct task_struct *t); | |
831 | extern void ftrace_graph_exit_task(struct task_struct *t); | |
832 | extern void ftrace_graph_init_idle_task(struct task_struct *t, int cpu); | |
833 | ||
834 | static inline int task_curr_ret_stack(struct task_struct *t) | |
835 | { | |
836 | return t->curr_ret_stack; | |
837 | } | |
838 | ||
839 | static inline void pause_graph_tracing(void) | |
840 | { | |
841 | atomic_inc(¤t->tracing_graph_pause); | |
842 | } | |
843 | ||
844 | static inline void unpause_graph_tracing(void) | |
845 | { | |
846 | atomic_dec(¤t->tracing_graph_pause); | |
847 | } | |
848 | #else /* !CONFIG_FUNCTION_GRAPH_TRACER */ | |
849 | ||
850 | #define __notrace_funcgraph | |
851 | #define INIT_FTRACE_GRAPH | |
852 | ||
853 | static inline void ftrace_graph_init_task(struct task_struct *t) { } | |
854 | static inline void ftrace_graph_exit_task(struct task_struct *t) { } | |
855 | static inline void ftrace_graph_init_idle_task(struct task_struct *t, int cpu) { } | |
856 | ||
857 | static inline int register_ftrace_graph(trace_func_graph_ret_t retfunc, | |
858 | trace_func_graph_ent_t entryfunc) | |
859 | { | |
860 | return -1; | |
861 | } | |
862 | static inline void unregister_ftrace_graph(void) { } | |
863 | ||
864 | static inline int task_curr_ret_stack(struct task_struct *tsk) | |
865 | { | |
866 | return -1; | |
867 | } | |
868 | ||
869 | static inline void pause_graph_tracing(void) { } | |
870 | static inline void unpause_graph_tracing(void) { } | |
871 | #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ | |
872 | ||
873 | #ifdef CONFIG_TRACING | |
874 | ||
875 | /* flags for current->trace */ | |
876 | enum { | |
877 | TSK_TRACE_FL_TRACE_BIT = 0, | |
878 | TSK_TRACE_FL_GRAPH_BIT = 1, | |
879 | }; | |
880 | enum { | |
881 | TSK_TRACE_FL_TRACE = 1 << TSK_TRACE_FL_TRACE_BIT, | |
882 | TSK_TRACE_FL_GRAPH = 1 << TSK_TRACE_FL_GRAPH_BIT, | |
883 | }; | |
884 | ||
885 | static inline void set_tsk_trace_trace(struct task_struct *tsk) | |
886 | { | |
887 | set_bit(TSK_TRACE_FL_TRACE_BIT, &tsk->trace); | |
888 | } | |
889 | ||
890 | static inline void clear_tsk_trace_trace(struct task_struct *tsk) | |
891 | { | |
892 | clear_bit(TSK_TRACE_FL_TRACE_BIT, &tsk->trace); | |
893 | } | |
894 | ||
895 | static inline int test_tsk_trace_trace(struct task_struct *tsk) | |
896 | { | |
897 | return tsk->trace & TSK_TRACE_FL_TRACE; | |
898 | } | |
899 | ||
900 | static inline void set_tsk_trace_graph(struct task_struct *tsk) | |
901 | { | |
902 | set_bit(TSK_TRACE_FL_GRAPH_BIT, &tsk->trace); | |
903 | } | |
904 | ||
905 | static inline void clear_tsk_trace_graph(struct task_struct *tsk) | |
906 | { | |
907 | clear_bit(TSK_TRACE_FL_GRAPH_BIT, &tsk->trace); | |
908 | } | |
909 | ||
910 | static inline int test_tsk_trace_graph(struct task_struct *tsk) | |
911 | { | |
912 | return tsk->trace & TSK_TRACE_FL_GRAPH; | |
913 | } | |
914 | ||
915 | enum ftrace_dump_mode; | |
916 | ||
917 | extern enum ftrace_dump_mode ftrace_dump_on_oops; | |
918 | extern int tracepoint_printk; | |
919 | ||
920 | extern void disable_trace_on_warning(void); | |
921 | extern int __disable_trace_on_warning; | |
922 | ||
923 | #ifdef CONFIG_PREEMPT | |
924 | #define INIT_TRACE_RECURSION .trace_recursion = 0, | |
925 | #endif | |
926 | ||
927 | #else /* CONFIG_TRACING */ | |
928 | static inline void disable_trace_on_warning(void) { } | |
929 | #endif /* CONFIG_TRACING */ | |
930 | ||
931 | #ifndef INIT_TRACE_RECURSION | |
932 | #define INIT_TRACE_RECURSION | |
933 | #endif | |
934 | ||
935 | #ifdef CONFIG_FTRACE_SYSCALLS | |
936 | ||
937 | unsigned long arch_syscall_addr(int nr); | |
938 | ||
939 | #endif /* CONFIG_FTRACE_SYSCALLS */ | |
940 | ||
941 | #endif /* _LINUX_FTRACE_H */ |