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Commit | Line | Data |
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9849ed4d MF |
1 | /* |
2 | * Ftrace header. For implementation details beyond the random comments | |
3 | * scattered below, see: Documentation/trace/ftrace-design.txt | |
4 | */ | |
5 | ||
16444a8a ACM |
6 | #ifndef _LINUX_FTRACE_H |
7 | #define _LINUX_FTRACE_H | |
8 | ||
0012693a | 9 | #include <linux/trace_clock.h> |
5601020f | 10 | #include <linux/kallsyms.h> |
0012693a | 11 | #include <linux/linkage.h> |
ea4e2bc4 | 12 | #include <linux/bitops.h> |
0012693a | 13 | #include <linux/ktime.h> |
21a8c466 | 14 | #include <linux/sched.h> |
0012693a FW |
15 | #include <linux/types.h> |
16 | #include <linux/init.h> | |
17 | #include <linux/fs.h> | |
16444a8a | 18 | |
c79a61f5 UKK |
19 | #include <asm/ftrace.h> |
20 | ||
de477254 | 21 | struct module; |
04da85b8 SR |
22 | struct ftrace_hash; |
23 | ||
606576ce | 24 | #ifdef CONFIG_FUNCTION_TRACER |
3e1932ad | 25 | |
b0fc494f SR |
26 | extern int ftrace_enabled; |
27 | extern int | |
28 | ftrace_enable_sysctl(struct ctl_table *table, int write, | |
8d65af78 | 29 | void __user *buffer, size_t *lenp, |
b0fc494f SR |
30 | loff_t *ppos); |
31 | ||
16444a8a ACM |
32 | typedef void (*ftrace_func_t)(unsigned long ip, unsigned long parent_ip); |
33 | ||
e248491a JO |
34 | /* |
35 | * FTRACE_OPS_FL_* bits denote the state of ftrace_ops struct and are | |
36 | * set in the flags member. | |
37 | * | |
38 | * ENABLED - set/unset when ftrace_ops is registered/unregistered | |
39 | * GLOBAL - set manualy by ftrace_ops user to denote the ftrace_ops | |
40 | * is part of the global tracers sharing the same filter | |
41 | * via set_ftrace_* debugfs files. | |
42 | * DYNAMIC - set when ftrace_ops is registered to denote dynamically | |
43 | * allocated ftrace_ops which need special care | |
44 | * CONTROL - set manualy by ftrace_ops user to denote the ftrace_ops | |
45 | * could be controled by following calls: | |
46 | * ftrace_function_local_enable | |
47 | * ftrace_function_local_disable | |
48 | */ | |
b848914c SR |
49 | enum { |
50 | FTRACE_OPS_FL_ENABLED = 1 << 0, | |
51 | FTRACE_OPS_FL_GLOBAL = 1 << 1, | |
cdbe61bf | 52 | FTRACE_OPS_FL_DYNAMIC = 1 << 2, |
e248491a | 53 | FTRACE_OPS_FL_CONTROL = 1 << 3, |
b848914c SR |
54 | }; |
55 | ||
16444a8a | 56 | struct ftrace_ops { |
f45948e8 SR |
57 | ftrace_func_t func; |
58 | struct ftrace_ops *next; | |
b848914c | 59 | unsigned long flags; |
e248491a | 60 | int __percpu *disabled; |
f45948e8 SR |
61 | #ifdef CONFIG_DYNAMIC_FTRACE |
62 | struct ftrace_hash *notrace_hash; | |
63 | struct ftrace_hash *filter_hash; | |
64 | #endif | |
16444a8a ACM |
65 | }; |
66 | ||
60a7ecf4 SR |
67 | extern int function_trace_stop; |
68 | ||
e7d3737e FW |
69 | /* |
70 | * Type of the current tracing. | |
71 | */ | |
72 | enum ftrace_tracing_type_t { | |
73 | FTRACE_TYPE_ENTER = 0, /* Hook the call of the function */ | |
74 | FTRACE_TYPE_RETURN, /* Hook the return of the function */ | |
75 | }; | |
76 | ||
77 | /* Current tracing type, default is FTRACE_TYPE_ENTER */ | |
78 | extern enum ftrace_tracing_type_t ftrace_tracing_type; | |
79 | ||
60a7ecf4 SR |
80 | /** |
81 | * ftrace_stop - stop function tracer. | |
82 | * | |
83 | * A quick way to stop the function tracer. Note this an on off switch, | |
84 | * it is not something that is recursive like preempt_disable. | |
85 | * This does not disable the calling of mcount, it only stops the | |
86 | * calling of functions from mcount. | |
87 | */ | |
88 | static inline void ftrace_stop(void) | |
89 | { | |
90 | function_trace_stop = 1; | |
91 | } | |
92 | ||
93 | /** | |
94 | * ftrace_start - start the function tracer. | |
95 | * | |
96 | * This function is the inverse of ftrace_stop. This does not enable | |
97 | * the function tracing if the function tracer is disabled. This only | |
98 | * sets the function tracer flag to continue calling the functions | |
99 | * from mcount. | |
100 | */ | |
101 | static inline void ftrace_start(void) | |
102 | { | |
103 | function_trace_stop = 0; | |
104 | } | |
105 | ||
16444a8a ACM |
106 | /* |
107 | * The ftrace_ops must be a static and should also | |
108 | * be read_mostly. These functions do modify read_mostly variables | |
109 | * so use them sparely. Never free an ftrace_op or modify the | |
110 | * next pointer after it has been registered. Even after unregistering | |
111 | * it, the next pointer may still be used internally. | |
112 | */ | |
113 | int register_ftrace_function(struct ftrace_ops *ops); | |
114 | int unregister_ftrace_function(struct ftrace_ops *ops); | |
115 | void clear_ftrace_function(void); | |
116 | ||
e248491a JO |
117 | /** |
118 | * ftrace_function_local_enable - enable controlled ftrace_ops on current cpu | |
119 | * | |
120 | * This function enables tracing on current cpu by decreasing | |
121 | * the per cpu control variable. | |
122 | * It must be called with preemption disabled and only on ftrace_ops | |
123 | * registered with FTRACE_OPS_FL_CONTROL. If called without preemption | |
124 | * disabled, this_cpu_ptr will complain when CONFIG_DEBUG_PREEMPT is enabled. | |
125 | */ | |
126 | static inline void ftrace_function_local_enable(struct ftrace_ops *ops) | |
127 | { | |
128 | if (WARN_ON_ONCE(!(ops->flags & FTRACE_OPS_FL_CONTROL))) | |
129 | return; | |
130 | ||
131 | (*this_cpu_ptr(ops->disabled))--; | |
132 | } | |
133 | ||
134 | /** | |
135 | * ftrace_function_local_disable - enable controlled ftrace_ops on current cpu | |
136 | * | |
137 | * This function enables tracing on current cpu by decreasing | |
138 | * the per cpu control variable. | |
139 | * It must be called with preemption disabled and only on ftrace_ops | |
140 | * registered with FTRACE_OPS_FL_CONTROL. If called without preemption | |
141 | * disabled, this_cpu_ptr will complain when CONFIG_DEBUG_PREEMPT is enabled. | |
142 | */ | |
143 | static inline void ftrace_function_local_disable(struct ftrace_ops *ops) | |
144 | { | |
145 | if (WARN_ON_ONCE(!(ops->flags & FTRACE_OPS_FL_CONTROL))) | |
146 | return; | |
147 | ||
148 | (*this_cpu_ptr(ops->disabled))++; | |
149 | } | |
150 | ||
151 | /** | |
152 | * ftrace_function_local_disabled - returns ftrace_ops disabled value | |
153 | * on current cpu | |
154 | * | |
155 | * This function returns value of ftrace_ops::disabled on current cpu. | |
156 | * It must be called with preemption disabled and only on ftrace_ops | |
157 | * registered with FTRACE_OPS_FL_CONTROL. If called without preemption | |
158 | * disabled, this_cpu_ptr will complain when CONFIG_DEBUG_PREEMPT is enabled. | |
159 | */ | |
160 | static inline int ftrace_function_local_disabled(struct ftrace_ops *ops) | |
161 | { | |
162 | WARN_ON_ONCE(!(ops->flags & FTRACE_OPS_FL_CONTROL)); | |
163 | return *this_cpu_ptr(ops->disabled); | |
164 | } | |
165 | ||
16444a8a | 166 | extern void ftrace_stub(unsigned long a0, unsigned long a1); |
16444a8a | 167 | |
606576ce | 168 | #else /* !CONFIG_FUNCTION_TRACER */ |
4dbf6bc2 SR |
169 | /* |
170 | * (un)register_ftrace_function must be a macro since the ops parameter | |
171 | * must not be evaluated. | |
172 | */ | |
173 | #define register_ftrace_function(ops) ({ 0; }) | |
174 | #define unregister_ftrace_function(ops) ({ 0; }) | |
175 | static inline void clear_ftrace_function(void) { } | |
81adbdc0 | 176 | static inline void ftrace_kill(void) { } |
60a7ecf4 SR |
177 | static inline void ftrace_stop(void) { } |
178 | static inline void ftrace_start(void) { } | |
606576ce | 179 | #endif /* CONFIG_FUNCTION_TRACER */ |
352ad25a | 180 | |
f38f1d2a SR |
181 | #ifdef CONFIG_STACK_TRACER |
182 | extern int stack_tracer_enabled; | |
183 | int | |
184 | stack_trace_sysctl(struct ctl_table *table, int write, | |
8d65af78 | 185 | void __user *buffer, size_t *lenp, |
f38f1d2a SR |
186 | loff_t *ppos); |
187 | #endif | |
188 | ||
f6180773 SR |
189 | struct ftrace_func_command { |
190 | struct list_head list; | |
191 | char *name; | |
43dd61c9 SR |
192 | int (*func)(struct ftrace_hash *hash, |
193 | char *func, char *cmd, | |
f6180773 SR |
194 | char *params, int enable); |
195 | }; | |
196 | ||
3d083395 | 197 | #ifdef CONFIG_DYNAMIC_FTRACE |
31e88909 | 198 | |
000ab691 SR |
199 | int ftrace_arch_code_modify_prepare(void); |
200 | int ftrace_arch_code_modify_post_process(void); | |
201 | ||
c88fd863 SR |
202 | void ftrace_bug(int err, unsigned long ip); |
203 | ||
809dcf29 SR |
204 | struct seq_file; |
205 | ||
b6887d79 | 206 | struct ftrace_probe_ops { |
59df055f SR |
207 | void (*func)(unsigned long ip, |
208 | unsigned long parent_ip, | |
209 | void **data); | |
210 | int (*callback)(unsigned long ip, void **data); | |
211 | void (*free)(void **data); | |
809dcf29 SR |
212 | int (*print)(struct seq_file *m, |
213 | unsigned long ip, | |
b6887d79 | 214 | struct ftrace_probe_ops *ops, |
809dcf29 | 215 | void *data); |
59df055f SR |
216 | }; |
217 | ||
218 | extern int | |
b6887d79 | 219 | register_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops, |
59df055f SR |
220 | void *data); |
221 | extern void | |
b6887d79 | 222 | unregister_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops, |
59df055f SR |
223 | void *data); |
224 | extern void | |
b6887d79 SR |
225 | unregister_ftrace_function_probe_func(char *glob, struct ftrace_probe_ops *ops); |
226 | extern void unregister_ftrace_function_probe_all(char *glob); | |
59df055f | 227 | |
2cfa1978 MH |
228 | extern int ftrace_text_reserved(void *start, void *end); |
229 | ||
3c1720f0 | 230 | enum { |
ed926f9b | 231 | FTRACE_FL_ENABLED = (1 << 30), |
3c1720f0 SR |
232 | }; |
233 | ||
ed926f9b SR |
234 | #define FTRACE_FL_MASK (0x3UL << 30) |
235 | #define FTRACE_REF_MAX ((1 << 30) - 1) | |
236 | ||
3d083395 | 237 | struct dyn_ftrace { |
ee000b7f LJ |
238 | union { |
239 | unsigned long ip; /* address of mcount call-site */ | |
240 | struct dyn_ftrace *freelist; | |
241 | }; | |
85ae32ae | 242 | unsigned long flags; |
ee000b7f | 243 | struct dyn_arch_ftrace arch; |
3d083395 SR |
244 | }; |
245 | ||
e1c08bdd | 246 | int ftrace_force_update(void); |
ac483c44 | 247 | int ftrace_set_filter(struct ftrace_ops *ops, unsigned char *buf, |
936e074b | 248 | int len, int reset); |
ac483c44 | 249 | int ftrace_set_notrace(struct ftrace_ops *ops, unsigned char *buf, |
936e074b SR |
250 | int len, int reset); |
251 | void ftrace_set_global_filter(unsigned char *buf, int len, int reset); | |
252 | void ftrace_set_global_notrace(unsigned char *buf, int len, int reset); | |
e1c08bdd | 253 | |
f6180773 SR |
254 | int register_ftrace_command(struct ftrace_func_command *cmd); |
255 | int unregister_ftrace_command(struct ftrace_func_command *cmd); | |
256 | ||
c88fd863 SR |
257 | enum { |
258 | FTRACE_UPDATE_CALLS = (1 << 0), | |
259 | FTRACE_DISABLE_CALLS = (1 << 1), | |
260 | FTRACE_UPDATE_TRACE_FUNC = (1 << 2), | |
261 | FTRACE_START_FUNC_RET = (1 << 3), | |
262 | FTRACE_STOP_FUNC_RET = (1 << 4), | |
263 | }; | |
264 | ||
265 | enum { | |
266 | FTRACE_UPDATE_IGNORE, | |
267 | FTRACE_UPDATE_MAKE_CALL, | |
268 | FTRACE_UPDATE_MAKE_NOP, | |
269 | }; | |
270 | ||
fc13cb0c SR |
271 | enum { |
272 | FTRACE_ITER_FILTER = (1 << 0), | |
273 | FTRACE_ITER_NOTRACE = (1 << 1), | |
274 | FTRACE_ITER_PRINTALL = (1 << 2), | |
69a3083c SR |
275 | FTRACE_ITER_DO_HASH = (1 << 3), |
276 | FTRACE_ITER_HASH = (1 << 4), | |
277 | FTRACE_ITER_ENABLED = (1 << 5), | |
fc13cb0c SR |
278 | }; |
279 | ||
c88fd863 SR |
280 | void arch_ftrace_update_code(int command); |
281 | ||
282 | struct ftrace_rec_iter; | |
283 | ||
284 | struct ftrace_rec_iter *ftrace_rec_iter_start(void); | |
285 | struct ftrace_rec_iter *ftrace_rec_iter_next(struct ftrace_rec_iter *iter); | |
286 | struct dyn_ftrace *ftrace_rec_iter_record(struct ftrace_rec_iter *iter); | |
287 | ||
288 | int ftrace_update_record(struct dyn_ftrace *rec, int enable); | |
289 | int ftrace_test_record(struct dyn_ftrace *rec, int enable); | |
290 | void ftrace_run_stop_machine(int command); | |
291 | int ftrace_location(unsigned long ip); | |
292 | ||
293 | extern ftrace_func_t ftrace_trace_function; | |
294 | ||
fc13cb0c SR |
295 | int ftrace_regex_open(struct ftrace_ops *ops, int flag, |
296 | struct inode *inode, struct file *file); | |
297 | ssize_t ftrace_filter_write(struct file *file, const char __user *ubuf, | |
298 | size_t cnt, loff_t *ppos); | |
299 | ssize_t ftrace_notrace_write(struct file *file, const char __user *ubuf, | |
300 | size_t cnt, loff_t *ppos); | |
301 | loff_t ftrace_regex_lseek(struct file *file, loff_t offset, int origin); | |
302 | int ftrace_regex_release(struct inode *inode, struct file *file); | |
303 | ||
2a85a37f SR |
304 | void __init |
305 | ftrace_set_early_filter(struct ftrace_ops *ops, char *buf, int enable); | |
306 | ||
3d083395 | 307 | /* defined in arch */ |
3c1720f0 | 308 | extern int ftrace_ip_converted(unsigned long ip); |
d61f82d0 | 309 | extern int ftrace_dyn_arch_init(void *data); |
d61f82d0 SR |
310 | extern int ftrace_update_ftrace_func(ftrace_func_t func); |
311 | extern void ftrace_caller(void); | |
312 | extern void ftrace_call(void); | |
313 | extern void mcount_call(void); | |
f0001207 SL |
314 | |
315 | #ifndef FTRACE_ADDR | |
316 | #define FTRACE_ADDR ((unsigned long)ftrace_caller) | |
317 | #endif | |
fb52607a FW |
318 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
319 | extern void ftrace_graph_caller(void); | |
5a45cfe1 SR |
320 | extern int ftrace_enable_ftrace_graph_caller(void); |
321 | extern int ftrace_disable_ftrace_graph_caller(void); | |
322 | #else | |
323 | static inline int ftrace_enable_ftrace_graph_caller(void) { return 0; } | |
324 | static inline int ftrace_disable_ftrace_graph_caller(void) { return 0; } | |
e7d3737e | 325 | #endif |
ad90c0e3 | 326 | |
31e88909 | 327 | /** |
57794a9d | 328 | * ftrace_make_nop - convert code into nop |
31e88909 SR |
329 | * @mod: module structure if called by module load initialization |
330 | * @rec: the mcount call site record | |
331 | * @addr: the address that the call site should be calling | |
332 | * | |
333 | * This is a very sensitive operation and great care needs | |
334 | * to be taken by the arch. The operation should carefully | |
335 | * read the location, check to see if what is read is indeed | |
336 | * what we expect it to be, and then on success of the compare, | |
337 | * it should write to the location. | |
338 | * | |
339 | * The code segment at @rec->ip should be a caller to @addr | |
340 | * | |
341 | * Return must be: | |
342 | * 0 on success | |
343 | * -EFAULT on error reading the location | |
344 | * -EINVAL on a failed compare of the contents | |
345 | * -EPERM on error writing to the location | |
346 | * Any other value will be considered a failure. | |
347 | */ | |
348 | extern int ftrace_make_nop(struct module *mod, | |
349 | struct dyn_ftrace *rec, unsigned long addr); | |
a26a2a27 | 350 | |
593eb8a2 | 351 | /** |
31e88909 SR |
352 | * ftrace_make_call - convert a nop call site into a call to addr |
353 | * @rec: the mcount call site record | |
354 | * @addr: the address that the call site should call | |
593eb8a2 SR |
355 | * |
356 | * This is a very sensitive operation and great care needs | |
357 | * to be taken by the arch. The operation should carefully | |
358 | * read the location, check to see if what is read is indeed | |
359 | * what we expect it to be, and then on success of the compare, | |
360 | * it should write to the location. | |
361 | * | |
31e88909 SR |
362 | * The code segment at @rec->ip should be a nop |
363 | * | |
593eb8a2 SR |
364 | * Return must be: |
365 | * 0 on success | |
366 | * -EFAULT on error reading the location | |
367 | * -EINVAL on a failed compare of the contents | |
368 | * -EPERM on error writing to the location | |
369 | * Any other value will be considered a failure. | |
370 | */ | |
31e88909 SR |
371 | extern int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr); |
372 | ||
31e88909 SR |
373 | /* May be defined in arch */ |
374 | extern int ftrace_arch_read_dyn_info(char *buf, int size); | |
593eb8a2 | 375 | |
ecea656d AS |
376 | extern int skip_trace(unsigned long ip); |
377 | ||
c0719e5a SR |
378 | extern void ftrace_disable_daemon(void); |
379 | extern void ftrace_enable_daemon(void); | |
e1c08bdd | 380 | #else |
4dbf6bc2 SR |
381 | static inline int skip_trace(unsigned long ip) { return 0; } |
382 | static inline int ftrace_force_update(void) { return 0; } | |
383 | static inline void ftrace_set_filter(unsigned char *buf, int len, int reset) | |
384 | { | |
385 | } | |
386 | static inline void ftrace_disable_daemon(void) { } | |
387 | static inline void ftrace_enable_daemon(void) { } | |
e7247a15 | 388 | static inline void ftrace_release_mod(struct module *mod) {} |
f6180773 SR |
389 | static inline int register_ftrace_command(struct ftrace_func_command *cmd) |
390 | { | |
97d0bb8d | 391 | return -EINVAL; |
f6180773 SR |
392 | } |
393 | static inline int unregister_ftrace_command(char *cmd_name) | |
394 | { | |
97d0bb8d | 395 | return -EINVAL; |
f6180773 | 396 | } |
2cfa1978 MH |
397 | static inline int ftrace_text_reserved(void *start, void *end) |
398 | { | |
399 | return 0; | |
400 | } | |
fc13cb0c SR |
401 | |
402 | /* | |
403 | * Again users of functions that have ftrace_ops may not | |
404 | * have them defined when ftrace is not enabled, but these | |
405 | * functions may still be called. Use a macro instead of inline. | |
406 | */ | |
407 | #define ftrace_regex_open(ops, flag, inod, file) ({ -ENODEV; }) | |
96de37b6 | 408 | #define ftrace_set_early_filter(ops, buf, enable) do { } while (0) |
fc13cb0c SR |
409 | |
410 | static inline ssize_t ftrace_filter_write(struct file *file, const char __user *ubuf, | |
411 | size_t cnt, loff_t *ppos) { return -ENODEV; } | |
412 | static inline ssize_t ftrace_notrace_write(struct file *file, const char __user *ubuf, | |
413 | size_t cnt, loff_t *ppos) { return -ENODEV; } | |
414 | static inline loff_t ftrace_regex_lseek(struct file *file, loff_t offset, int origin) | |
415 | { | |
416 | return -ENODEV; | |
417 | } | |
418 | static inline int | |
419 | ftrace_regex_release(struct inode *inode, struct file *file) { return -ENODEV; } | |
ecea656d | 420 | #endif /* CONFIG_DYNAMIC_FTRACE */ |
352ad25a | 421 | |
aeaee8a2 IM |
422 | /* totally disable ftrace - can not re-enable after this */ |
423 | void ftrace_kill(void); | |
424 | ||
f43fdad8 IM |
425 | static inline void tracer_disable(void) |
426 | { | |
606576ce | 427 | #ifdef CONFIG_FUNCTION_TRACER |
f43fdad8 IM |
428 | ftrace_enabled = 0; |
429 | #endif | |
430 | } | |
431 | ||
37002735 HY |
432 | /* |
433 | * Ftrace disable/restore without lock. Some synchronization mechanism | |
9bdeb7b5 | 434 | * must be used to prevent ftrace_enabled to be changed between |
37002735 HY |
435 | * disable/restore. |
436 | */ | |
9bdeb7b5 HY |
437 | static inline int __ftrace_enabled_save(void) |
438 | { | |
606576ce | 439 | #ifdef CONFIG_FUNCTION_TRACER |
9bdeb7b5 HY |
440 | int saved_ftrace_enabled = ftrace_enabled; |
441 | ftrace_enabled = 0; | |
442 | return saved_ftrace_enabled; | |
443 | #else | |
444 | return 0; | |
445 | #endif | |
446 | } | |
447 | ||
448 | static inline void __ftrace_enabled_restore(int enabled) | |
449 | { | |
606576ce | 450 | #ifdef CONFIG_FUNCTION_TRACER |
9bdeb7b5 HY |
451 | ftrace_enabled = enabled; |
452 | #endif | |
453 | } | |
454 | ||
c79a61f5 UKK |
455 | #ifndef HAVE_ARCH_CALLER_ADDR |
456 | # ifdef CONFIG_FRAME_POINTER | |
457 | # define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0)) | |
458 | # define CALLER_ADDR1 ((unsigned long)__builtin_return_address(1)) | |
459 | # define CALLER_ADDR2 ((unsigned long)__builtin_return_address(2)) | |
460 | # define CALLER_ADDR3 ((unsigned long)__builtin_return_address(3)) | |
461 | # define CALLER_ADDR4 ((unsigned long)__builtin_return_address(4)) | |
462 | # define CALLER_ADDR5 ((unsigned long)__builtin_return_address(5)) | |
463 | # define CALLER_ADDR6 ((unsigned long)__builtin_return_address(6)) | |
464 | # else | |
465 | # define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0)) | |
466 | # define CALLER_ADDR1 0UL | |
467 | # define CALLER_ADDR2 0UL | |
468 | # define CALLER_ADDR3 0UL | |
469 | # define CALLER_ADDR4 0UL | |
470 | # define CALLER_ADDR5 0UL | |
471 | # define CALLER_ADDR6 0UL | |
472 | # endif | |
473 | #endif /* ifndef HAVE_ARCH_CALLER_ADDR */ | |
352ad25a | 474 | |
81d68a96 | 475 | #ifdef CONFIG_IRQSOFF_TRACER |
489f1396 IM |
476 | extern void time_hardirqs_on(unsigned long a0, unsigned long a1); |
477 | extern void time_hardirqs_off(unsigned long a0, unsigned long a1); | |
81d68a96 | 478 | #else |
4dbf6bc2 SR |
479 | static inline void time_hardirqs_on(unsigned long a0, unsigned long a1) { } |
480 | static inline void time_hardirqs_off(unsigned long a0, unsigned long a1) { } | |
81d68a96 SR |
481 | #endif |
482 | ||
6cd8a4bb | 483 | #ifdef CONFIG_PREEMPT_TRACER |
489f1396 IM |
484 | extern void trace_preempt_on(unsigned long a0, unsigned long a1); |
485 | extern void trace_preempt_off(unsigned long a0, unsigned long a1); | |
6cd8a4bb | 486 | #else |
4dbf6bc2 SR |
487 | static inline void trace_preempt_on(unsigned long a0, unsigned long a1) { } |
488 | static inline void trace_preempt_off(unsigned long a0, unsigned long a1) { } | |
6cd8a4bb SR |
489 | #endif |
490 | ||
68bf21aa SR |
491 | #ifdef CONFIG_FTRACE_MCOUNT_RECORD |
492 | extern void ftrace_init(void); | |
493 | #else | |
494 | static inline void ftrace_init(void) { } | |
495 | #endif | |
496 | ||
287b6e68 FW |
497 | /* |
498 | * Structure that defines an entry function trace. | |
499 | */ | |
500 | struct ftrace_graph_ent { | |
501 | unsigned long func; /* Current function */ | |
502 | int depth; | |
503 | }; | |
dd0e545f | 504 | |
caf4b323 FW |
505 | /* |
506 | * Structure that defines a return function trace. | |
507 | */ | |
fb52607a | 508 | struct ftrace_graph_ret { |
caf4b323 FW |
509 | unsigned long func; /* Current function */ |
510 | unsigned long long calltime; | |
511 | unsigned long long rettime; | |
0231022c FW |
512 | /* Number of functions that overran the depth limit for current task */ |
513 | unsigned long overrun; | |
287b6e68 | 514 | int depth; |
caf4b323 FW |
515 | }; |
516 | ||
62b915f1 JO |
517 | /* Type of the callback handlers for tracing function graph*/ |
518 | typedef void (*trace_func_graph_ret_t)(struct ftrace_graph_ret *); /* return */ | |
519 | typedef int (*trace_func_graph_ent_t)(struct ftrace_graph_ent *); /* entry */ | |
520 | ||
fb52607a | 521 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
8b96f011 | 522 | |
5ac9f622 | 523 | /* for init task */ |
f876d346 | 524 | #define INIT_FTRACE_GRAPH .ret_stack = NULL, |
5ac9f622 | 525 | |
712406a6 SR |
526 | /* |
527 | * Stack of return addresses for functions | |
528 | * of a thread. | |
529 | * Used in struct thread_info | |
530 | */ | |
531 | struct ftrace_ret_stack { | |
532 | unsigned long ret; | |
533 | unsigned long func; | |
534 | unsigned long long calltime; | |
a2a16d6a | 535 | unsigned long long subtime; |
71e308a2 | 536 | unsigned long fp; |
712406a6 SR |
537 | }; |
538 | ||
539 | /* | |
540 | * Primary handler of a function return. | |
541 | * It relays on ftrace_return_to_handler. | |
542 | * Defined in entry_32/64.S | |
543 | */ | |
544 | extern void return_to_handler(void); | |
545 | ||
546 | extern int | |
71e308a2 SR |
547 | ftrace_push_return_trace(unsigned long ret, unsigned long func, int *depth, |
548 | unsigned long frame_pointer); | |
712406a6 | 549 | |
8b96f011 FW |
550 | /* |
551 | * Sometimes we don't want to trace a function with the function | |
552 | * graph tracer but we want them to keep traced by the usual function | |
553 | * tracer if the function graph tracer is not configured. | |
554 | */ | |
555 | #define __notrace_funcgraph notrace | |
556 | ||
bcbc4f20 FW |
557 | /* |
558 | * We want to which function is an entrypoint of a hardirq. | |
559 | * That will help us to put a signal on output. | |
560 | */ | |
561 | #define __irq_entry __attribute__((__section__(".irqentry.text"))) | |
562 | ||
563 | /* Limits of hardirq entrypoints */ | |
564 | extern char __irqentry_text_start[]; | |
565 | extern char __irqentry_text_end[]; | |
566 | ||
f201ae23 FW |
567 | #define FTRACE_RETFUNC_DEPTH 50 |
568 | #define FTRACE_RETSTACK_ALLOC_SIZE 32 | |
287b6e68 FW |
569 | extern int register_ftrace_graph(trace_func_graph_ret_t retfunc, |
570 | trace_func_graph_ent_t entryfunc); | |
571 | ||
14a866c5 SR |
572 | extern void ftrace_graph_stop(void); |
573 | ||
287b6e68 FW |
574 | /* The current handlers in use */ |
575 | extern trace_func_graph_ret_t ftrace_graph_return; | |
576 | extern trace_func_graph_ent_t ftrace_graph_entry; | |
caf4b323 | 577 | |
fb52607a | 578 | extern void unregister_ftrace_graph(void); |
f201ae23 | 579 | |
fb52607a FW |
580 | extern void ftrace_graph_init_task(struct task_struct *t); |
581 | extern void ftrace_graph_exit_task(struct task_struct *t); | |
868baf07 | 582 | extern void ftrace_graph_init_idle_task(struct task_struct *t, int cpu); |
21a8c466 FW |
583 | |
584 | static inline int task_curr_ret_stack(struct task_struct *t) | |
585 | { | |
586 | return t->curr_ret_stack; | |
587 | } | |
380c4b14 FW |
588 | |
589 | static inline void pause_graph_tracing(void) | |
590 | { | |
591 | atomic_inc(¤t->tracing_graph_pause); | |
592 | } | |
593 | ||
594 | static inline void unpause_graph_tracing(void) | |
595 | { | |
596 | atomic_dec(¤t->tracing_graph_pause); | |
597 | } | |
5ac9f622 | 598 | #else /* !CONFIG_FUNCTION_GRAPH_TRACER */ |
8b96f011 FW |
599 | |
600 | #define __notrace_funcgraph | |
bcbc4f20 | 601 | #define __irq_entry |
5ac9f622 | 602 | #define INIT_FTRACE_GRAPH |
8b96f011 | 603 | |
fb52607a FW |
604 | static inline void ftrace_graph_init_task(struct task_struct *t) { } |
605 | static inline void ftrace_graph_exit_task(struct task_struct *t) { } | |
868baf07 | 606 | static inline void ftrace_graph_init_idle_task(struct task_struct *t, int cpu) { } |
21a8c466 | 607 | |
62b915f1 JO |
608 | static inline int register_ftrace_graph(trace_func_graph_ret_t retfunc, |
609 | trace_func_graph_ent_t entryfunc) | |
610 | { | |
611 | return -1; | |
612 | } | |
613 | static inline void unregister_ftrace_graph(void) { } | |
614 | ||
21a8c466 FW |
615 | static inline int task_curr_ret_stack(struct task_struct *tsk) |
616 | { | |
617 | return -1; | |
618 | } | |
380c4b14 FW |
619 | |
620 | static inline void pause_graph_tracing(void) { } | |
621 | static inline void unpause_graph_tracing(void) { } | |
5ac9f622 | 622 | #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ |
caf4b323 | 623 | |
ea4e2bc4 | 624 | #ifdef CONFIG_TRACING |
ea4e2bc4 SR |
625 | |
626 | /* flags for current->trace */ | |
627 | enum { | |
628 | TSK_TRACE_FL_TRACE_BIT = 0, | |
629 | TSK_TRACE_FL_GRAPH_BIT = 1, | |
630 | }; | |
631 | enum { | |
632 | TSK_TRACE_FL_TRACE = 1 << TSK_TRACE_FL_TRACE_BIT, | |
633 | TSK_TRACE_FL_GRAPH = 1 << TSK_TRACE_FL_GRAPH_BIT, | |
634 | }; | |
635 | ||
636 | static inline void set_tsk_trace_trace(struct task_struct *tsk) | |
637 | { | |
638 | set_bit(TSK_TRACE_FL_TRACE_BIT, &tsk->trace); | |
639 | } | |
640 | ||
641 | static inline void clear_tsk_trace_trace(struct task_struct *tsk) | |
642 | { | |
643 | clear_bit(TSK_TRACE_FL_TRACE_BIT, &tsk->trace); | |
644 | } | |
645 | ||
646 | static inline int test_tsk_trace_trace(struct task_struct *tsk) | |
647 | { | |
648 | return tsk->trace & TSK_TRACE_FL_TRACE; | |
649 | } | |
650 | ||
651 | static inline void set_tsk_trace_graph(struct task_struct *tsk) | |
652 | { | |
653 | set_bit(TSK_TRACE_FL_GRAPH_BIT, &tsk->trace); | |
654 | } | |
655 | ||
656 | static inline void clear_tsk_trace_graph(struct task_struct *tsk) | |
657 | { | |
658 | clear_bit(TSK_TRACE_FL_GRAPH_BIT, &tsk->trace); | |
659 | } | |
660 | ||
661 | static inline int test_tsk_trace_graph(struct task_struct *tsk) | |
662 | { | |
663 | return tsk->trace & TSK_TRACE_FL_GRAPH; | |
664 | } | |
665 | ||
cecbca96 FW |
666 | enum ftrace_dump_mode; |
667 | ||
668 | extern enum ftrace_dump_mode ftrace_dump_on_oops; | |
526211bc | 669 | |
261842b7 SR |
670 | #ifdef CONFIG_PREEMPT |
671 | #define INIT_TRACE_RECURSION .trace_recursion = 0, | |
672 | #endif | |
673 | ||
ea4e2bc4 SR |
674 | #endif /* CONFIG_TRACING */ |
675 | ||
261842b7 SR |
676 | #ifndef INIT_TRACE_RECURSION |
677 | #define INIT_TRACE_RECURSION | |
678 | #endif | |
b1818748 | 679 | |
e7b8e675 MF |
680 | #ifdef CONFIG_FTRACE_SYSCALLS |
681 | ||
682 | unsigned long arch_syscall_addr(int nr); | |
683 | ||
684 | #endif /* CONFIG_FTRACE_SYSCALLS */ | |
685 | ||
16444a8a | 686 | #endif /* _LINUX_FTRACE_H */ |