Commit | Line | Data |
---|---|---|
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); | |
5500fa51 | 253 | void ftrace_free_filter(struct ftrace_ops *ops); |
e1c08bdd | 254 | |
f6180773 SR |
255 | int register_ftrace_command(struct ftrace_func_command *cmd); |
256 | int unregister_ftrace_command(struct ftrace_func_command *cmd); | |
257 | ||
c88fd863 SR |
258 | enum { |
259 | FTRACE_UPDATE_CALLS = (1 << 0), | |
260 | FTRACE_DISABLE_CALLS = (1 << 1), | |
261 | FTRACE_UPDATE_TRACE_FUNC = (1 << 2), | |
262 | FTRACE_START_FUNC_RET = (1 << 3), | |
263 | FTRACE_STOP_FUNC_RET = (1 << 4), | |
264 | }; | |
265 | ||
266 | enum { | |
267 | FTRACE_UPDATE_IGNORE, | |
268 | FTRACE_UPDATE_MAKE_CALL, | |
269 | FTRACE_UPDATE_MAKE_NOP, | |
270 | }; | |
271 | ||
fc13cb0c SR |
272 | enum { |
273 | FTRACE_ITER_FILTER = (1 << 0), | |
274 | FTRACE_ITER_NOTRACE = (1 << 1), | |
275 | FTRACE_ITER_PRINTALL = (1 << 2), | |
69a3083c SR |
276 | FTRACE_ITER_DO_HASH = (1 << 3), |
277 | FTRACE_ITER_HASH = (1 << 4), | |
278 | FTRACE_ITER_ENABLED = (1 << 5), | |
fc13cb0c SR |
279 | }; |
280 | ||
c88fd863 SR |
281 | void arch_ftrace_update_code(int command); |
282 | ||
283 | struct ftrace_rec_iter; | |
284 | ||
285 | struct ftrace_rec_iter *ftrace_rec_iter_start(void); | |
286 | struct ftrace_rec_iter *ftrace_rec_iter_next(struct ftrace_rec_iter *iter); | |
287 | struct dyn_ftrace *ftrace_rec_iter_record(struct ftrace_rec_iter *iter); | |
288 | ||
08d636b6 SR |
289 | #define for_ftrace_rec_iter(iter) \ |
290 | for (iter = ftrace_rec_iter_start(); \ | |
291 | iter; \ | |
292 | iter = ftrace_rec_iter_next(iter)) | |
293 | ||
294 | ||
c88fd863 SR |
295 | int ftrace_update_record(struct dyn_ftrace *rec, int enable); |
296 | int ftrace_test_record(struct dyn_ftrace *rec, int enable); | |
297 | void ftrace_run_stop_machine(int command); | |
f0cf973a | 298 | unsigned long ftrace_location(unsigned long ip); |
c88fd863 SR |
299 | |
300 | extern ftrace_func_t ftrace_trace_function; | |
301 | ||
fc13cb0c SR |
302 | int ftrace_regex_open(struct ftrace_ops *ops, int flag, |
303 | struct inode *inode, struct file *file); | |
304 | ssize_t ftrace_filter_write(struct file *file, const char __user *ubuf, | |
305 | size_t cnt, loff_t *ppos); | |
306 | ssize_t ftrace_notrace_write(struct file *file, const char __user *ubuf, | |
307 | size_t cnt, loff_t *ppos); | |
308 | loff_t ftrace_regex_lseek(struct file *file, loff_t offset, int origin); | |
309 | int ftrace_regex_release(struct inode *inode, struct file *file); | |
310 | ||
2a85a37f SR |
311 | void __init |
312 | ftrace_set_early_filter(struct ftrace_ops *ops, char *buf, int enable); | |
313 | ||
3d083395 | 314 | /* defined in arch */ |
3c1720f0 | 315 | extern int ftrace_ip_converted(unsigned long ip); |
d61f82d0 | 316 | extern int ftrace_dyn_arch_init(void *data); |
e4f5d544 | 317 | extern void ftrace_replace_code(int enable); |
d61f82d0 SR |
318 | extern int ftrace_update_ftrace_func(ftrace_func_t func); |
319 | extern void ftrace_caller(void); | |
320 | extern void ftrace_call(void); | |
321 | extern void mcount_call(void); | |
f0001207 | 322 | |
8ed3e2cf SR |
323 | void ftrace_modify_all_code(int command); |
324 | ||
f0001207 SL |
325 | #ifndef FTRACE_ADDR |
326 | #define FTRACE_ADDR ((unsigned long)ftrace_caller) | |
327 | #endif | |
fb52607a FW |
328 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
329 | extern void ftrace_graph_caller(void); | |
5a45cfe1 SR |
330 | extern int ftrace_enable_ftrace_graph_caller(void); |
331 | extern int ftrace_disable_ftrace_graph_caller(void); | |
332 | #else | |
333 | static inline int ftrace_enable_ftrace_graph_caller(void) { return 0; } | |
334 | static inline int ftrace_disable_ftrace_graph_caller(void) { return 0; } | |
e7d3737e | 335 | #endif |
ad90c0e3 | 336 | |
31e88909 | 337 | /** |
57794a9d | 338 | * ftrace_make_nop - convert code into nop |
31e88909 SR |
339 | * @mod: module structure if called by module load initialization |
340 | * @rec: the mcount call site record | |
341 | * @addr: the address that the call site should be calling | |
342 | * | |
343 | * This is a very sensitive operation and great care needs | |
344 | * to be taken by the arch. The operation should carefully | |
345 | * read the location, check to see if what is read is indeed | |
346 | * what we expect it to be, and then on success of the compare, | |
347 | * it should write to the location. | |
348 | * | |
349 | * The code segment at @rec->ip should be a caller to @addr | |
350 | * | |
351 | * Return must be: | |
352 | * 0 on success | |
353 | * -EFAULT on error reading the location | |
354 | * -EINVAL on a failed compare of the contents | |
355 | * -EPERM on error writing to the location | |
356 | * Any other value will be considered a failure. | |
357 | */ | |
358 | extern int ftrace_make_nop(struct module *mod, | |
359 | struct dyn_ftrace *rec, unsigned long addr); | |
a26a2a27 | 360 | |
593eb8a2 | 361 | /** |
31e88909 SR |
362 | * ftrace_make_call - convert a nop call site into a call to addr |
363 | * @rec: the mcount call site record | |
364 | * @addr: the address that the call site should call | |
593eb8a2 SR |
365 | * |
366 | * This is a very sensitive operation and great care needs | |
367 | * to be taken by the arch. The operation should carefully | |
368 | * read the location, check to see if what is read is indeed | |
369 | * what we expect it to be, and then on success of the compare, | |
370 | * it should write to the location. | |
371 | * | |
31e88909 SR |
372 | * The code segment at @rec->ip should be a nop |
373 | * | |
593eb8a2 SR |
374 | * Return must be: |
375 | * 0 on success | |
376 | * -EFAULT on error reading the location | |
377 | * -EINVAL on a failed compare of the contents | |
378 | * -EPERM on error writing to the location | |
379 | * Any other value will be considered a failure. | |
380 | */ | |
31e88909 SR |
381 | extern int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr); |
382 | ||
31e88909 SR |
383 | /* May be defined in arch */ |
384 | extern int ftrace_arch_read_dyn_info(char *buf, int size); | |
593eb8a2 | 385 | |
ecea656d AS |
386 | extern int skip_trace(unsigned long ip); |
387 | ||
c0719e5a SR |
388 | extern void ftrace_disable_daemon(void); |
389 | extern void ftrace_enable_daemon(void); | |
e1c08bdd | 390 | #else |
4dbf6bc2 SR |
391 | static inline int skip_trace(unsigned long ip) { return 0; } |
392 | static inline int ftrace_force_update(void) { return 0; } | |
4dbf6bc2 SR |
393 | static inline void ftrace_disable_daemon(void) { } |
394 | static inline void ftrace_enable_daemon(void) { } | |
e7247a15 | 395 | static inline void ftrace_release_mod(struct module *mod) {} |
f6180773 SR |
396 | static inline int register_ftrace_command(struct ftrace_func_command *cmd) |
397 | { | |
97d0bb8d | 398 | return -EINVAL; |
f6180773 SR |
399 | } |
400 | static inline int unregister_ftrace_command(char *cmd_name) | |
401 | { | |
97d0bb8d | 402 | return -EINVAL; |
f6180773 | 403 | } |
2cfa1978 MH |
404 | static inline int ftrace_text_reserved(void *start, void *end) |
405 | { | |
406 | return 0; | |
407 | } | |
fc13cb0c SR |
408 | |
409 | /* | |
410 | * Again users of functions that have ftrace_ops may not | |
411 | * have them defined when ftrace is not enabled, but these | |
412 | * functions may still be called. Use a macro instead of inline. | |
413 | */ | |
414 | #define ftrace_regex_open(ops, flag, inod, file) ({ -ENODEV; }) | |
96de37b6 | 415 | #define ftrace_set_early_filter(ops, buf, enable) do { } while (0) |
5500fa51 JO |
416 | #define ftrace_set_filter(ops, buf, len, reset) ({ -ENODEV; }) |
417 | #define ftrace_set_notrace(ops, buf, len, reset) ({ -ENODEV; }) | |
418 | #define ftrace_free_filter(ops) do { } while (0) | |
fc13cb0c SR |
419 | |
420 | static inline ssize_t ftrace_filter_write(struct file *file, const char __user *ubuf, | |
421 | size_t cnt, loff_t *ppos) { return -ENODEV; } | |
422 | static inline ssize_t ftrace_notrace_write(struct file *file, const char __user *ubuf, | |
423 | size_t cnt, loff_t *ppos) { return -ENODEV; } | |
424 | static inline loff_t ftrace_regex_lseek(struct file *file, loff_t offset, int origin) | |
425 | { | |
426 | return -ENODEV; | |
427 | } | |
428 | static inline int | |
429 | ftrace_regex_release(struct inode *inode, struct file *file) { return -ENODEV; } | |
ecea656d | 430 | #endif /* CONFIG_DYNAMIC_FTRACE */ |
352ad25a | 431 | |
aeaee8a2 IM |
432 | /* totally disable ftrace - can not re-enable after this */ |
433 | void ftrace_kill(void); | |
434 | ||
f43fdad8 IM |
435 | static inline void tracer_disable(void) |
436 | { | |
606576ce | 437 | #ifdef CONFIG_FUNCTION_TRACER |
f43fdad8 IM |
438 | ftrace_enabled = 0; |
439 | #endif | |
440 | } | |
441 | ||
37002735 HY |
442 | /* |
443 | * Ftrace disable/restore without lock. Some synchronization mechanism | |
9bdeb7b5 | 444 | * must be used to prevent ftrace_enabled to be changed between |
37002735 HY |
445 | * disable/restore. |
446 | */ | |
9bdeb7b5 HY |
447 | static inline int __ftrace_enabled_save(void) |
448 | { | |
606576ce | 449 | #ifdef CONFIG_FUNCTION_TRACER |
9bdeb7b5 HY |
450 | int saved_ftrace_enabled = ftrace_enabled; |
451 | ftrace_enabled = 0; | |
452 | return saved_ftrace_enabled; | |
453 | #else | |
454 | return 0; | |
455 | #endif | |
456 | } | |
457 | ||
458 | static inline void __ftrace_enabled_restore(int enabled) | |
459 | { | |
606576ce | 460 | #ifdef CONFIG_FUNCTION_TRACER |
9bdeb7b5 HY |
461 | ftrace_enabled = enabled; |
462 | #endif | |
463 | } | |
464 | ||
c79a61f5 UKK |
465 | #ifndef HAVE_ARCH_CALLER_ADDR |
466 | # ifdef CONFIG_FRAME_POINTER | |
467 | # define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0)) | |
468 | # define CALLER_ADDR1 ((unsigned long)__builtin_return_address(1)) | |
469 | # define CALLER_ADDR2 ((unsigned long)__builtin_return_address(2)) | |
470 | # define CALLER_ADDR3 ((unsigned long)__builtin_return_address(3)) | |
471 | # define CALLER_ADDR4 ((unsigned long)__builtin_return_address(4)) | |
472 | # define CALLER_ADDR5 ((unsigned long)__builtin_return_address(5)) | |
473 | # define CALLER_ADDR6 ((unsigned long)__builtin_return_address(6)) | |
474 | # else | |
475 | # define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0)) | |
476 | # define CALLER_ADDR1 0UL | |
477 | # define CALLER_ADDR2 0UL | |
478 | # define CALLER_ADDR3 0UL | |
479 | # define CALLER_ADDR4 0UL | |
480 | # define CALLER_ADDR5 0UL | |
481 | # define CALLER_ADDR6 0UL | |
482 | # endif | |
483 | #endif /* ifndef HAVE_ARCH_CALLER_ADDR */ | |
352ad25a | 484 | |
81d68a96 | 485 | #ifdef CONFIG_IRQSOFF_TRACER |
489f1396 IM |
486 | extern void time_hardirqs_on(unsigned long a0, unsigned long a1); |
487 | extern void time_hardirqs_off(unsigned long a0, unsigned long a1); | |
81d68a96 | 488 | #else |
4dbf6bc2 SR |
489 | static inline void time_hardirqs_on(unsigned long a0, unsigned long a1) { } |
490 | static inline void time_hardirqs_off(unsigned long a0, unsigned long a1) { } | |
81d68a96 SR |
491 | #endif |
492 | ||
6cd8a4bb | 493 | #ifdef CONFIG_PREEMPT_TRACER |
489f1396 IM |
494 | extern void trace_preempt_on(unsigned long a0, unsigned long a1); |
495 | extern void trace_preempt_off(unsigned long a0, unsigned long a1); | |
6cd8a4bb | 496 | #else |
b02ee9a3 MB |
497 | /* |
498 | * Use defines instead of static inlines because some arches will make code out | |
499 | * of the CALLER_ADDR, when we really want these to be a real nop. | |
500 | */ | |
501 | # define trace_preempt_on(a0, a1) do { } while (0) | |
502 | # define trace_preempt_off(a0, a1) do { } while (0) | |
6cd8a4bb SR |
503 | #endif |
504 | ||
68bf21aa SR |
505 | #ifdef CONFIG_FTRACE_MCOUNT_RECORD |
506 | extern void ftrace_init(void); | |
507 | #else | |
508 | static inline void ftrace_init(void) { } | |
509 | #endif | |
510 | ||
287b6e68 FW |
511 | /* |
512 | * Structure that defines an entry function trace. | |
513 | */ | |
514 | struct ftrace_graph_ent { | |
515 | unsigned long func; /* Current function */ | |
516 | int depth; | |
517 | }; | |
dd0e545f | 518 | |
caf4b323 FW |
519 | /* |
520 | * Structure that defines a return function trace. | |
521 | */ | |
fb52607a | 522 | struct ftrace_graph_ret { |
caf4b323 FW |
523 | unsigned long func; /* Current function */ |
524 | unsigned long long calltime; | |
525 | unsigned long long rettime; | |
0231022c FW |
526 | /* Number of functions that overran the depth limit for current task */ |
527 | unsigned long overrun; | |
287b6e68 | 528 | int depth; |
caf4b323 FW |
529 | }; |
530 | ||
62b915f1 JO |
531 | /* Type of the callback handlers for tracing function graph*/ |
532 | typedef void (*trace_func_graph_ret_t)(struct ftrace_graph_ret *); /* return */ | |
533 | typedef int (*trace_func_graph_ent_t)(struct ftrace_graph_ent *); /* entry */ | |
534 | ||
fb52607a | 535 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
8b96f011 | 536 | |
5ac9f622 | 537 | /* for init task */ |
f876d346 | 538 | #define INIT_FTRACE_GRAPH .ret_stack = NULL, |
5ac9f622 | 539 | |
712406a6 SR |
540 | /* |
541 | * Stack of return addresses for functions | |
542 | * of a thread. | |
543 | * Used in struct thread_info | |
544 | */ | |
545 | struct ftrace_ret_stack { | |
546 | unsigned long ret; | |
547 | unsigned long func; | |
548 | unsigned long long calltime; | |
a2a16d6a | 549 | unsigned long long subtime; |
71e308a2 | 550 | unsigned long fp; |
712406a6 SR |
551 | }; |
552 | ||
553 | /* | |
554 | * Primary handler of a function return. | |
555 | * It relays on ftrace_return_to_handler. | |
556 | * Defined in entry_32/64.S | |
557 | */ | |
558 | extern void return_to_handler(void); | |
559 | ||
560 | extern int | |
71e308a2 SR |
561 | ftrace_push_return_trace(unsigned long ret, unsigned long func, int *depth, |
562 | unsigned long frame_pointer); | |
712406a6 | 563 | |
8b96f011 FW |
564 | /* |
565 | * Sometimes we don't want to trace a function with the function | |
566 | * graph tracer but we want them to keep traced by the usual function | |
567 | * tracer if the function graph tracer is not configured. | |
568 | */ | |
569 | #define __notrace_funcgraph notrace | |
570 | ||
bcbc4f20 FW |
571 | /* |
572 | * We want to which function is an entrypoint of a hardirq. | |
573 | * That will help us to put a signal on output. | |
574 | */ | |
575 | #define __irq_entry __attribute__((__section__(".irqentry.text"))) | |
576 | ||
577 | /* Limits of hardirq entrypoints */ | |
578 | extern char __irqentry_text_start[]; | |
579 | extern char __irqentry_text_end[]; | |
580 | ||
f201ae23 FW |
581 | #define FTRACE_RETFUNC_DEPTH 50 |
582 | #define FTRACE_RETSTACK_ALLOC_SIZE 32 | |
287b6e68 FW |
583 | extern int register_ftrace_graph(trace_func_graph_ret_t retfunc, |
584 | trace_func_graph_ent_t entryfunc); | |
585 | ||
14a866c5 SR |
586 | extern void ftrace_graph_stop(void); |
587 | ||
287b6e68 FW |
588 | /* The current handlers in use */ |
589 | extern trace_func_graph_ret_t ftrace_graph_return; | |
590 | extern trace_func_graph_ent_t ftrace_graph_entry; | |
caf4b323 | 591 | |
fb52607a | 592 | extern void unregister_ftrace_graph(void); |
f201ae23 | 593 | |
fb52607a FW |
594 | extern void ftrace_graph_init_task(struct task_struct *t); |
595 | extern void ftrace_graph_exit_task(struct task_struct *t); | |
868baf07 | 596 | extern void ftrace_graph_init_idle_task(struct task_struct *t, int cpu); |
21a8c466 FW |
597 | |
598 | static inline int task_curr_ret_stack(struct task_struct *t) | |
599 | { | |
600 | return t->curr_ret_stack; | |
601 | } | |
380c4b14 FW |
602 | |
603 | static inline void pause_graph_tracing(void) | |
604 | { | |
605 | atomic_inc(¤t->tracing_graph_pause); | |
606 | } | |
607 | ||
608 | static inline void unpause_graph_tracing(void) | |
609 | { | |
610 | atomic_dec(¤t->tracing_graph_pause); | |
611 | } | |
5ac9f622 | 612 | #else /* !CONFIG_FUNCTION_GRAPH_TRACER */ |
8b96f011 FW |
613 | |
614 | #define __notrace_funcgraph | |
bcbc4f20 | 615 | #define __irq_entry |
5ac9f622 | 616 | #define INIT_FTRACE_GRAPH |
8b96f011 | 617 | |
fb52607a FW |
618 | static inline void ftrace_graph_init_task(struct task_struct *t) { } |
619 | static inline void ftrace_graph_exit_task(struct task_struct *t) { } | |
868baf07 | 620 | static inline void ftrace_graph_init_idle_task(struct task_struct *t, int cpu) { } |
21a8c466 | 621 | |
62b915f1 JO |
622 | static inline int register_ftrace_graph(trace_func_graph_ret_t retfunc, |
623 | trace_func_graph_ent_t entryfunc) | |
624 | { | |
625 | return -1; | |
626 | } | |
627 | static inline void unregister_ftrace_graph(void) { } | |
628 | ||
21a8c466 FW |
629 | static inline int task_curr_ret_stack(struct task_struct *tsk) |
630 | { | |
631 | return -1; | |
632 | } | |
380c4b14 FW |
633 | |
634 | static inline void pause_graph_tracing(void) { } | |
635 | static inline void unpause_graph_tracing(void) { } | |
5ac9f622 | 636 | #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ |
caf4b323 | 637 | |
ea4e2bc4 | 638 | #ifdef CONFIG_TRACING |
ea4e2bc4 SR |
639 | |
640 | /* flags for current->trace */ | |
641 | enum { | |
642 | TSK_TRACE_FL_TRACE_BIT = 0, | |
643 | TSK_TRACE_FL_GRAPH_BIT = 1, | |
644 | }; | |
645 | enum { | |
646 | TSK_TRACE_FL_TRACE = 1 << TSK_TRACE_FL_TRACE_BIT, | |
647 | TSK_TRACE_FL_GRAPH = 1 << TSK_TRACE_FL_GRAPH_BIT, | |
648 | }; | |
649 | ||
650 | static inline void set_tsk_trace_trace(struct task_struct *tsk) | |
651 | { | |
652 | set_bit(TSK_TRACE_FL_TRACE_BIT, &tsk->trace); | |
653 | } | |
654 | ||
655 | static inline void clear_tsk_trace_trace(struct task_struct *tsk) | |
656 | { | |
657 | clear_bit(TSK_TRACE_FL_TRACE_BIT, &tsk->trace); | |
658 | } | |
659 | ||
660 | static inline int test_tsk_trace_trace(struct task_struct *tsk) | |
661 | { | |
662 | return tsk->trace & TSK_TRACE_FL_TRACE; | |
663 | } | |
664 | ||
665 | static inline void set_tsk_trace_graph(struct task_struct *tsk) | |
666 | { | |
667 | set_bit(TSK_TRACE_FL_GRAPH_BIT, &tsk->trace); | |
668 | } | |
669 | ||
670 | static inline void clear_tsk_trace_graph(struct task_struct *tsk) | |
671 | { | |
672 | clear_bit(TSK_TRACE_FL_GRAPH_BIT, &tsk->trace); | |
673 | } | |
674 | ||
675 | static inline int test_tsk_trace_graph(struct task_struct *tsk) | |
676 | { | |
677 | return tsk->trace & TSK_TRACE_FL_GRAPH; | |
678 | } | |
679 | ||
cecbca96 FW |
680 | enum ftrace_dump_mode; |
681 | ||
682 | extern enum ftrace_dump_mode ftrace_dump_on_oops; | |
526211bc | 683 | |
261842b7 SR |
684 | #ifdef CONFIG_PREEMPT |
685 | #define INIT_TRACE_RECURSION .trace_recursion = 0, | |
686 | #endif | |
687 | ||
ea4e2bc4 SR |
688 | #endif /* CONFIG_TRACING */ |
689 | ||
261842b7 SR |
690 | #ifndef INIT_TRACE_RECURSION |
691 | #define INIT_TRACE_RECURSION | |
692 | #endif | |
b1818748 | 693 | |
e7b8e675 MF |
694 | #ifdef CONFIG_FTRACE_SYSCALLS |
695 | ||
696 | unsigned long arch_syscall_addr(int nr); | |
697 | ||
698 | #endif /* CONFIG_FTRACE_SYSCALLS */ | |
699 | ||
16444a8a | 700 | #endif /* _LINUX_FTRACE_H */ |