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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 | ||
2f5f6ad9 SR |
21 | /* |
22 | * If the arch supports passing the variable contents of | |
23 | * function_trace_op as the third parameter back from the | |
24 | * mcount call, then the arch should define this as 1. | |
25 | */ | |
26 | #ifndef ARCH_SUPPORTS_FTRACE_OPS | |
27 | #define ARCH_SUPPORTS_FTRACE_OPS 0 | |
28 | #endif | |
29 | ||
ccf3672d SR |
30 | /* |
31 | * If the arch's mcount caller does not support all of ftrace's | |
32 | * features, then it must call an indirect function that | |
33 | * does. Or at least does enough to prevent any unwelcomed side effects. | |
34 | */ | |
35 | #if !defined(CONFIG_HAVE_FUNCTION_TRACE_MCOUNT_TEST) || \ | |
36 | !ARCH_SUPPORTS_FTRACE_OPS | |
37 | # define FTRACE_FORCE_LIST_FUNC 1 | |
38 | #else | |
39 | # define FTRACE_FORCE_LIST_FUNC 0 | |
40 | #endif | |
41 | ||
42 | ||
de477254 | 43 | struct module; |
04da85b8 SR |
44 | struct ftrace_hash; |
45 | ||
606576ce | 46 | #ifdef CONFIG_FUNCTION_TRACER |
3e1932ad | 47 | |
b0fc494f SR |
48 | extern int ftrace_enabled; |
49 | extern int | |
50 | ftrace_enable_sysctl(struct ctl_table *table, int write, | |
8d65af78 | 51 | void __user *buffer, size_t *lenp, |
b0fc494f SR |
52 | loff_t *ppos); |
53 | ||
2f5f6ad9 SR |
54 | struct ftrace_ops; |
55 | ||
56 | typedef void (*ftrace_func_t)(unsigned long ip, unsigned long parent_ip, | |
57 | struct ftrace_ops *op); | |
16444a8a | 58 | |
e248491a JO |
59 | /* |
60 | * FTRACE_OPS_FL_* bits denote the state of ftrace_ops struct and are | |
61 | * set in the flags member. | |
62 | * | |
63 | * ENABLED - set/unset when ftrace_ops is registered/unregistered | |
64 | * GLOBAL - set manualy by ftrace_ops user to denote the ftrace_ops | |
65 | * is part of the global tracers sharing the same filter | |
66 | * via set_ftrace_* debugfs files. | |
67 | * DYNAMIC - set when ftrace_ops is registered to denote dynamically | |
68 | * allocated ftrace_ops which need special care | |
69 | * CONTROL - set manualy by ftrace_ops user to denote the ftrace_ops | |
70 | * could be controled by following calls: | |
71 | * ftrace_function_local_enable | |
72 | * ftrace_function_local_disable | |
73 | */ | |
b848914c SR |
74 | enum { |
75 | FTRACE_OPS_FL_ENABLED = 1 << 0, | |
76 | FTRACE_OPS_FL_GLOBAL = 1 << 1, | |
cdbe61bf | 77 | FTRACE_OPS_FL_DYNAMIC = 1 << 2, |
e248491a | 78 | FTRACE_OPS_FL_CONTROL = 1 << 3, |
b848914c SR |
79 | }; |
80 | ||
16444a8a | 81 | struct ftrace_ops { |
f45948e8 SR |
82 | ftrace_func_t func; |
83 | struct ftrace_ops *next; | |
b848914c | 84 | unsigned long flags; |
e248491a | 85 | int __percpu *disabled; |
f45948e8 SR |
86 | #ifdef CONFIG_DYNAMIC_FTRACE |
87 | struct ftrace_hash *notrace_hash; | |
88 | struct ftrace_hash *filter_hash; | |
89 | #endif | |
16444a8a ACM |
90 | }; |
91 | ||
60a7ecf4 SR |
92 | extern int function_trace_stop; |
93 | ||
e7d3737e FW |
94 | /* |
95 | * Type of the current tracing. | |
96 | */ | |
97 | enum ftrace_tracing_type_t { | |
98 | FTRACE_TYPE_ENTER = 0, /* Hook the call of the function */ | |
99 | FTRACE_TYPE_RETURN, /* Hook the return of the function */ | |
100 | }; | |
101 | ||
102 | /* Current tracing type, default is FTRACE_TYPE_ENTER */ | |
103 | extern enum ftrace_tracing_type_t ftrace_tracing_type; | |
104 | ||
60a7ecf4 SR |
105 | /** |
106 | * ftrace_stop - stop function tracer. | |
107 | * | |
108 | * A quick way to stop the function tracer. Note this an on off switch, | |
109 | * it is not something that is recursive like preempt_disable. | |
110 | * This does not disable the calling of mcount, it only stops the | |
111 | * calling of functions from mcount. | |
112 | */ | |
113 | static inline void ftrace_stop(void) | |
114 | { | |
115 | function_trace_stop = 1; | |
116 | } | |
117 | ||
118 | /** | |
119 | * ftrace_start - start the function tracer. | |
120 | * | |
121 | * This function is the inverse of ftrace_stop. This does not enable | |
122 | * the function tracing if the function tracer is disabled. This only | |
123 | * sets the function tracer flag to continue calling the functions | |
124 | * from mcount. | |
125 | */ | |
126 | static inline void ftrace_start(void) | |
127 | { | |
128 | function_trace_stop = 0; | |
129 | } | |
130 | ||
16444a8a ACM |
131 | /* |
132 | * The ftrace_ops must be a static and should also | |
133 | * be read_mostly. These functions do modify read_mostly variables | |
134 | * so use them sparely. Never free an ftrace_op or modify the | |
135 | * next pointer after it has been registered. Even after unregistering | |
136 | * it, the next pointer may still be used internally. | |
137 | */ | |
138 | int register_ftrace_function(struct ftrace_ops *ops); | |
139 | int unregister_ftrace_function(struct ftrace_ops *ops); | |
140 | void clear_ftrace_function(void); | |
141 | ||
e248491a JO |
142 | /** |
143 | * ftrace_function_local_enable - enable controlled ftrace_ops on current cpu | |
144 | * | |
145 | * This function enables tracing on current cpu by decreasing | |
146 | * the per cpu control variable. | |
147 | * It must be called with preemption disabled and only on ftrace_ops | |
148 | * registered with FTRACE_OPS_FL_CONTROL. If called without preemption | |
149 | * disabled, this_cpu_ptr will complain when CONFIG_DEBUG_PREEMPT is enabled. | |
150 | */ | |
151 | static inline void ftrace_function_local_enable(struct ftrace_ops *ops) | |
152 | { | |
153 | if (WARN_ON_ONCE(!(ops->flags & FTRACE_OPS_FL_CONTROL))) | |
154 | return; | |
155 | ||
156 | (*this_cpu_ptr(ops->disabled))--; | |
157 | } | |
158 | ||
159 | /** | |
160 | * ftrace_function_local_disable - enable controlled ftrace_ops on current cpu | |
161 | * | |
162 | * This function enables tracing on current cpu by decreasing | |
163 | * the per cpu control variable. | |
164 | * It must be called with preemption disabled and only on ftrace_ops | |
165 | * registered with FTRACE_OPS_FL_CONTROL. If called without preemption | |
166 | * disabled, this_cpu_ptr will complain when CONFIG_DEBUG_PREEMPT is enabled. | |
167 | */ | |
168 | static inline void ftrace_function_local_disable(struct ftrace_ops *ops) | |
169 | { | |
170 | if (WARN_ON_ONCE(!(ops->flags & FTRACE_OPS_FL_CONTROL))) | |
171 | return; | |
172 | ||
173 | (*this_cpu_ptr(ops->disabled))++; | |
174 | } | |
175 | ||
176 | /** | |
177 | * ftrace_function_local_disabled - returns ftrace_ops disabled value | |
178 | * on current cpu | |
179 | * | |
180 | * This function returns value of ftrace_ops::disabled on current cpu. | |
181 | * It must be called with preemption disabled and only on ftrace_ops | |
182 | * registered with FTRACE_OPS_FL_CONTROL. If called without preemption | |
183 | * disabled, this_cpu_ptr will complain when CONFIG_DEBUG_PREEMPT is enabled. | |
184 | */ | |
185 | static inline int ftrace_function_local_disabled(struct ftrace_ops *ops) | |
186 | { | |
187 | WARN_ON_ONCE(!(ops->flags & FTRACE_OPS_FL_CONTROL)); | |
188 | return *this_cpu_ptr(ops->disabled); | |
189 | } | |
190 | ||
2f5f6ad9 | 191 | extern void ftrace_stub(unsigned long a0, unsigned long a1, struct ftrace_ops *op); |
16444a8a | 192 | |
606576ce | 193 | #else /* !CONFIG_FUNCTION_TRACER */ |
4dbf6bc2 SR |
194 | /* |
195 | * (un)register_ftrace_function must be a macro since the ops parameter | |
196 | * must not be evaluated. | |
197 | */ | |
198 | #define register_ftrace_function(ops) ({ 0; }) | |
199 | #define unregister_ftrace_function(ops) ({ 0; }) | |
200 | static inline void clear_ftrace_function(void) { } | |
81adbdc0 | 201 | static inline void ftrace_kill(void) { } |
60a7ecf4 SR |
202 | static inline void ftrace_stop(void) { } |
203 | static inline void ftrace_start(void) { } | |
606576ce | 204 | #endif /* CONFIG_FUNCTION_TRACER */ |
352ad25a | 205 | |
f38f1d2a SR |
206 | #ifdef CONFIG_STACK_TRACER |
207 | extern int stack_tracer_enabled; | |
208 | int | |
209 | stack_trace_sysctl(struct ctl_table *table, int write, | |
8d65af78 | 210 | void __user *buffer, size_t *lenp, |
f38f1d2a SR |
211 | loff_t *ppos); |
212 | #endif | |
213 | ||
f6180773 SR |
214 | struct ftrace_func_command { |
215 | struct list_head list; | |
216 | char *name; | |
43dd61c9 SR |
217 | int (*func)(struct ftrace_hash *hash, |
218 | char *func, char *cmd, | |
f6180773 SR |
219 | char *params, int enable); |
220 | }; | |
221 | ||
3d083395 | 222 | #ifdef CONFIG_DYNAMIC_FTRACE |
31e88909 | 223 | |
000ab691 SR |
224 | int ftrace_arch_code_modify_prepare(void); |
225 | int ftrace_arch_code_modify_post_process(void); | |
226 | ||
c88fd863 SR |
227 | void ftrace_bug(int err, unsigned long ip); |
228 | ||
809dcf29 SR |
229 | struct seq_file; |
230 | ||
b6887d79 | 231 | struct ftrace_probe_ops { |
59df055f SR |
232 | void (*func)(unsigned long ip, |
233 | unsigned long parent_ip, | |
234 | void **data); | |
235 | int (*callback)(unsigned long ip, void **data); | |
236 | void (*free)(void **data); | |
809dcf29 SR |
237 | int (*print)(struct seq_file *m, |
238 | unsigned long ip, | |
b6887d79 | 239 | struct ftrace_probe_ops *ops, |
809dcf29 | 240 | void *data); |
59df055f SR |
241 | }; |
242 | ||
243 | extern int | |
b6887d79 | 244 | register_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops, |
59df055f SR |
245 | void *data); |
246 | extern void | |
b6887d79 | 247 | unregister_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops, |
59df055f SR |
248 | void *data); |
249 | extern void | |
b6887d79 SR |
250 | unregister_ftrace_function_probe_func(char *glob, struct ftrace_probe_ops *ops); |
251 | extern void unregister_ftrace_function_probe_all(char *glob); | |
59df055f | 252 | |
2cfa1978 MH |
253 | extern int ftrace_text_reserved(void *start, void *end); |
254 | ||
3c1720f0 | 255 | enum { |
ed926f9b | 256 | FTRACE_FL_ENABLED = (1 << 30), |
3c1720f0 SR |
257 | }; |
258 | ||
ed926f9b SR |
259 | #define FTRACE_FL_MASK (0x3UL << 30) |
260 | #define FTRACE_REF_MAX ((1 << 30) - 1) | |
261 | ||
3d083395 | 262 | struct dyn_ftrace { |
ee000b7f LJ |
263 | union { |
264 | unsigned long ip; /* address of mcount call-site */ | |
265 | struct dyn_ftrace *freelist; | |
266 | }; | |
85ae32ae | 267 | unsigned long flags; |
ee000b7f | 268 | struct dyn_arch_ftrace arch; |
3d083395 SR |
269 | }; |
270 | ||
e1c08bdd | 271 | int ftrace_force_update(void); |
ac483c44 | 272 | int ftrace_set_filter(struct ftrace_ops *ops, unsigned char *buf, |
936e074b | 273 | int len, int reset); |
ac483c44 | 274 | int ftrace_set_notrace(struct ftrace_ops *ops, unsigned char *buf, |
936e074b SR |
275 | int len, int reset); |
276 | void ftrace_set_global_filter(unsigned char *buf, int len, int reset); | |
277 | void ftrace_set_global_notrace(unsigned char *buf, int len, int reset); | |
5500fa51 | 278 | void ftrace_free_filter(struct ftrace_ops *ops); |
e1c08bdd | 279 | |
f6180773 SR |
280 | int register_ftrace_command(struct ftrace_func_command *cmd); |
281 | int unregister_ftrace_command(struct ftrace_func_command *cmd); | |
282 | ||
c88fd863 SR |
283 | enum { |
284 | FTRACE_UPDATE_CALLS = (1 << 0), | |
285 | FTRACE_DISABLE_CALLS = (1 << 1), | |
286 | FTRACE_UPDATE_TRACE_FUNC = (1 << 2), | |
287 | FTRACE_START_FUNC_RET = (1 << 3), | |
288 | FTRACE_STOP_FUNC_RET = (1 << 4), | |
289 | }; | |
290 | ||
291 | enum { | |
292 | FTRACE_UPDATE_IGNORE, | |
293 | FTRACE_UPDATE_MAKE_CALL, | |
294 | FTRACE_UPDATE_MAKE_NOP, | |
295 | }; | |
296 | ||
fc13cb0c SR |
297 | enum { |
298 | FTRACE_ITER_FILTER = (1 << 0), | |
299 | FTRACE_ITER_NOTRACE = (1 << 1), | |
300 | FTRACE_ITER_PRINTALL = (1 << 2), | |
69a3083c SR |
301 | FTRACE_ITER_DO_HASH = (1 << 3), |
302 | FTRACE_ITER_HASH = (1 << 4), | |
303 | FTRACE_ITER_ENABLED = (1 << 5), | |
fc13cb0c SR |
304 | }; |
305 | ||
c88fd863 SR |
306 | void arch_ftrace_update_code(int command); |
307 | ||
308 | struct ftrace_rec_iter; | |
309 | ||
310 | struct ftrace_rec_iter *ftrace_rec_iter_start(void); | |
311 | struct ftrace_rec_iter *ftrace_rec_iter_next(struct ftrace_rec_iter *iter); | |
312 | struct dyn_ftrace *ftrace_rec_iter_record(struct ftrace_rec_iter *iter); | |
313 | ||
08d636b6 SR |
314 | #define for_ftrace_rec_iter(iter) \ |
315 | for (iter = ftrace_rec_iter_start(); \ | |
316 | iter; \ | |
317 | iter = ftrace_rec_iter_next(iter)) | |
318 | ||
319 | ||
c88fd863 SR |
320 | int ftrace_update_record(struct dyn_ftrace *rec, int enable); |
321 | int ftrace_test_record(struct dyn_ftrace *rec, int enable); | |
322 | void ftrace_run_stop_machine(int command); | |
f0cf973a | 323 | unsigned long ftrace_location(unsigned long ip); |
c88fd863 SR |
324 | |
325 | extern ftrace_func_t ftrace_trace_function; | |
326 | ||
fc13cb0c SR |
327 | int ftrace_regex_open(struct ftrace_ops *ops, int flag, |
328 | struct inode *inode, struct file *file); | |
329 | ssize_t ftrace_filter_write(struct file *file, const char __user *ubuf, | |
330 | size_t cnt, loff_t *ppos); | |
331 | ssize_t ftrace_notrace_write(struct file *file, const char __user *ubuf, | |
332 | size_t cnt, loff_t *ppos); | |
333 | loff_t ftrace_regex_lseek(struct file *file, loff_t offset, int origin); | |
334 | int ftrace_regex_release(struct inode *inode, struct file *file); | |
335 | ||
2a85a37f SR |
336 | void __init |
337 | ftrace_set_early_filter(struct ftrace_ops *ops, char *buf, int enable); | |
338 | ||
3d083395 | 339 | /* defined in arch */ |
3c1720f0 | 340 | extern int ftrace_ip_converted(unsigned long ip); |
d61f82d0 | 341 | extern int ftrace_dyn_arch_init(void *data); |
e4f5d544 | 342 | extern void ftrace_replace_code(int enable); |
d61f82d0 SR |
343 | extern int ftrace_update_ftrace_func(ftrace_func_t func); |
344 | extern void ftrace_caller(void); | |
345 | extern void ftrace_call(void); | |
346 | extern void mcount_call(void); | |
f0001207 | 347 | |
8ed3e2cf SR |
348 | void ftrace_modify_all_code(int command); |
349 | ||
f0001207 SL |
350 | #ifndef FTRACE_ADDR |
351 | #define FTRACE_ADDR ((unsigned long)ftrace_caller) | |
352 | #endif | |
fb52607a FW |
353 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
354 | extern void ftrace_graph_caller(void); | |
5a45cfe1 SR |
355 | extern int ftrace_enable_ftrace_graph_caller(void); |
356 | extern int ftrace_disable_ftrace_graph_caller(void); | |
357 | #else | |
358 | static inline int ftrace_enable_ftrace_graph_caller(void) { return 0; } | |
359 | static inline int ftrace_disable_ftrace_graph_caller(void) { return 0; } | |
e7d3737e | 360 | #endif |
ad90c0e3 | 361 | |
31e88909 | 362 | /** |
57794a9d | 363 | * ftrace_make_nop - convert code into nop |
31e88909 SR |
364 | * @mod: module structure if called by module load initialization |
365 | * @rec: the mcount call site record | |
366 | * @addr: the address that the call site should be calling | |
367 | * | |
368 | * This is a very sensitive operation and great care needs | |
369 | * to be taken by the arch. The operation should carefully | |
370 | * read the location, check to see if what is read is indeed | |
371 | * what we expect it to be, and then on success of the compare, | |
372 | * it should write to the location. | |
373 | * | |
374 | * The code segment at @rec->ip should be a caller to @addr | |
375 | * | |
376 | * Return must be: | |
377 | * 0 on success | |
378 | * -EFAULT on error reading the location | |
379 | * -EINVAL on a failed compare of the contents | |
380 | * -EPERM on error writing to the location | |
381 | * Any other value will be considered a failure. | |
382 | */ | |
383 | extern int ftrace_make_nop(struct module *mod, | |
384 | struct dyn_ftrace *rec, unsigned long addr); | |
a26a2a27 | 385 | |
593eb8a2 | 386 | /** |
31e88909 SR |
387 | * ftrace_make_call - convert a nop call site into a call to addr |
388 | * @rec: the mcount call site record | |
389 | * @addr: the address that the call site should call | |
593eb8a2 SR |
390 | * |
391 | * This is a very sensitive operation and great care needs | |
392 | * to be taken by the arch. The operation should carefully | |
393 | * read the location, check to see if what is read is indeed | |
394 | * what we expect it to be, and then on success of the compare, | |
395 | * it should write to the location. | |
396 | * | |
31e88909 SR |
397 | * The code segment at @rec->ip should be a nop |
398 | * | |
593eb8a2 SR |
399 | * Return must be: |
400 | * 0 on success | |
401 | * -EFAULT on error reading the location | |
402 | * -EINVAL on a failed compare of the contents | |
403 | * -EPERM on error writing to the location | |
404 | * Any other value will be considered a failure. | |
405 | */ | |
31e88909 SR |
406 | extern int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr); |
407 | ||
31e88909 SR |
408 | /* May be defined in arch */ |
409 | extern int ftrace_arch_read_dyn_info(char *buf, int size); | |
593eb8a2 | 410 | |
ecea656d AS |
411 | extern int skip_trace(unsigned long ip); |
412 | ||
c0719e5a SR |
413 | extern void ftrace_disable_daemon(void); |
414 | extern void ftrace_enable_daemon(void); | |
e1c08bdd | 415 | #else |
4dbf6bc2 SR |
416 | static inline int skip_trace(unsigned long ip) { return 0; } |
417 | static inline int ftrace_force_update(void) { return 0; } | |
4dbf6bc2 SR |
418 | static inline void ftrace_disable_daemon(void) { } |
419 | static inline void ftrace_enable_daemon(void) { } | |
e7247a15 | 420 | static inline void ftrace_release_mod(struct module *mod) {} |
f6180773 SR |
421 | static inline int register_ftrace_command(struct ftrace_func_command *cmd) |
422 | { | |
97d0bb8d | 423 | return -EINVAL; |
f6180773 SR |
424 | } |
425 | static inline int unregister_ftrace_command(char *cmd_name) | |
426 | { | |
97d0bb8d | 427 | return -EINVAL; |
f6180773 | 428 | } |
2cfa1978 MH |
429 | static inline int ftrace_text_reserved(void *start, void *end) |
430 | { | |
431 | return 0; | |
432 | } | |
fc13cb0c SR |
433 | |
434 | /* | |
435 | * Again users of functions that have ftrace_ops may not | |
436 | * have them defined when ftrace is not enabled, but these | |
437 | * functions may still be called. Use a macro instead of inline. | |
438 | */ | |
439 | #define ftrace_regex_open(ops, flag, inod, file) ({ -ENODEV; }) | |
96de37b6 | 440 | #define ftrace_set_early_filter(ops, buf, enable) do { } while (0) |
5500fa51 JO |
441 | #define ftrace_set_filter(ops, buf, len, reset) ({ -ENODEV; }) |
442 | #define ftrace_set_notrace(ops, buf, len, reset) ({ -ENODEV; }) | |
443 | #define ftrace_free_filter(ops) do { } while (0) | |
fc13cb0c SR |
444 | |
445 | static inline ssize_t ftrace_filter_write(struct file *file, const char __user *ubuf, | |
446 | size_t cnt, loff_t *ppos) { return -ENODEV; } | |
447 | static inline ssize_t ftrace_notrace_write(struct file *file, const char __user *ubuf, | |
448 | size_t cnt, loff_t *ppos) { return -ENODEV; } | |
449 | static inline loff_t ftrace_regex_lseek(struct file *file, loff_t offset, int origin) | |
450 | { | |
451 | return -ENODEV; | |
452 | } | |
453 | static inline int | |
454 | ftrace_regex_release(struct inode *inode, struct file *file) { return -ENODEV; } | |
ecea656d | 455 | #endif /* CONFIG_DYNAMIC_FTRACE */ |
352ad25a | 456 | |
aeaee8a2 IM |
457 | /* totally disable ftrace - can not re-enable after this */ |
458 | void ftrace_kill(void); | |
459 | ||
f43fdad8 IM |
460 | static inline void tracer_disable(void) |
461 | { | |
606576ce | 462 | #ifdef CONFIG_FUNCTION_TRACER |
f43fdad8 IM |
463 | ftrace_enabled = 0; |
464 | #endif | |
465 | } | |
466 | ||
37002735 HY |
467 | /* |
468 | * Ftrace disable/restore without lock. Some synchronization mechanism | |
9bdeb7b5 | 469 | * must be used to prevent ftrace_enabled to be changed between |
37002735 HY |
470 | * disable/restore. |
471 | */ | |
9bdeb7b5 HY |
472 | static inline int __ftrace_enabled_save(void) |
473 | { | |
606576ce | 474 | #ifdef CONFIG_FUNCTION_TRACER |
9bdeb7b5 HY |
475 | int saved_ftrace_enabled = ftrace_enabled; |
476 | ftrace_enabled = 0; | |
477 | return saved_ftrace_enabled; | |
478 | #else | |
479 | return 0; | |
480 | #endif | |
481 | } | |
482 | ||
483 | static inline void __ftrace_enabled_restore(int enabled) | |
484 | { | |
606576ce | 485 | #ifdef CONFIG_FUNCTION_TRACER |
9bdeb7b5 HY |
486 | ftrace_enabled = enabled; |
487 | #endif | |
488 | } | |
489 | ||
c79a61f5 UKK |
490 | #ifndef HAVE_ARCH_CALLER_ADDR |
491 | # ifdef CONFIG_FRAME_POINTER | |
492 | # define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0)) | |
493 | # define CALLER_ADDR1 ((unsigned long)__builtin_return_address(1)) | |
494 | # define CALLER_ADDR2 ((unsigned long)__builtin_return_address(2)) | |
495 | # define CALLER_ADDR3 ((unsigned long)__builtin_return_address(3)) | |
496 | # define CALLER_ADDR4 ((unsigned long)__builtin_return_address(4)) | |
497 | # define CALLER_ADDR5 ((unsigned long)__builtin_return_address(5)) | |
498 | # define CALLER_ADDR6 ((unsigned long)__builtin_return_address(6)) | |
499 | # else | |
500 | # define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0)) | |
501 | # define CALLER_ADDR1 0UL | |
502 | # define CALLER_ADDR2 0UL | |
503 | # define CALLER_ADDR3 0UL | |
504 | # define CALLER_ADDR4 0UL | |
505 | # define CALLER_ADDR5 0UL | |
506 | # define CALLER_ADDR6 0UL | |
507 | # endif | |
508 | #endif /* ifndef HAVE_ARCH_CALLER_ADDR */ | |
352ad25a | 509 | |
81d68a96 | 510 | #ifdef CONFIG_IRQSOFF_TRACER |
489f1396 IM |
511 | extern void time_hardirqs_on(unsigned long a0, unsigned long a1); |
512 | extern void time_hardirqs_off(unsigned long a0, unsigned long a1); | |
81d68a96 | 513 | #else |
4dbf6bc2 SR |
514 | static inline void time_hardirqs_on(unsigned long a0, unsigned long a1) { } |
515 | static inline void time_hardirqs_off(unsigned long a0, unsigned long a1) { } | |
81d68a96 SR |
516 | #endif |
517 | ||
6cd8a4bb | 518 | #ifdef CONFIG_PREEMPT_TRACER |
489f1396 IM |
519 | extern void trace_preempt_on(unsigned long a0, unsigned long a1); |
520 | extern void trace_preempt_off(unsigned long a0, unsigned long a1); | |
6cd8a4bb | 521 | #else |
b02ee9a3 MB |
522 | /* |
523 | * Use defines instead of static inlines because some arches will make code out | |
524 | * of the CALLER_ADDR, when we really want these to be a real nop. | |
525 | */ | |
526 | # define trace_preempt_on(a0, a1) do { } while (0) | |
527 | # define trace_preempt_off(a0, a1) do { } while (0) | |
6cd8a4bb SR |
528 | #endif |
529 | ||
68bf21aa SR |
530 | #ifdef CONFIG_FTRACE_MCOUNT_RECORD |
531 | extern void ftrace_init(void); | |
532 | #else | |
533 | static inline void ftrace_init(void) { } | |
534 | #endif | |
535 | ||
287b6e68 FW |
536 | /* |
537 | * Structure that defines an entry function trace. | |
538 | */ | |
539 | struct ftrace_graph_ent { | |
540 | unsigned long func; /* Current function */ | |
541 | int depth; | |
542 | }; | |
dd0e545f | 543 | |
caf4b323 FW |
544 | /* |
545 | * Structure that defines a return function trace. | |
546 | */ | |
fb52607a | 547 | struct ftrace_graph_ret { |
caf4b323 FW |
548 | unsigned long func; /* Current function */ |
549 | unsigned long long calltime; | |
550 | unsigned long long rettime; | |
0231022c FW |
551 | /* Number of functions that overran the depth limit for current task */ |
552 | unsigned long overrun; | |
287b6e68 | 553 | int depth; |
caf4b323 FW |
554 | }; |
555 | ||
62b915f1 JO |
556 | /* Type of the callback handlers for tracing function graph*/ |
557 | typedef void (*trace_func_graph_ret_t)(struct ftrace_graph_ret *); /* return */ | |
558 | typedef int (*trace_func_graph_ent_t)(struct ftrace_graph_ent *); /* entry */ | |
559 | ||
fb52607a | 560 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
8b96f011 | 561 | |
5ac9f622 | 562 | /* for init task */ |
f876d346 | 563 | #define INIT_FTRACE_GRAPH .ret_stack = NULL, |
5ac9f622 | 564 | |
712406a6 SR |
565 | /* |
566 | * Stack of return addresses for functions | |
567 | * of a thread. | |
568 | * Used in struct thread_info | |
569 | */ | |
570 | struct ftrace_ret_stack { | |
571 | unsigned long ret; | |
572 | unsigned long func; | |
573 | unsigned long long calltime; | |
a2a16d6a | 574 | unsigned long long subtime; |
71e308a2 | 575 | unsigned long fp; |
712406a6 SR |
576 | }; |
577 | ||
578 | /* | |
579 | * Primary handler of a function return. | |
580 | * It relays on ftrace_return_to_handler. | |
581 | * Defined in entry_32/64.S | |
582 | */ | |
583 | extern void return_to_handler(void); | |
584 | ||
585 | extern int | |
71e308a2 SR |
586 | ftrace_push_return_trace(unsigned long ret, unsigned long func, int *depth, |
587 | unsigned long frame_pointer); | |
712406a6 | 588 | |
8b96f011 FW |
589 | /* |
590 | * Sometimes we don't want to trace a function with the function | |
591 | * graph tracer but we want them to keep traced by the usual function | |
592 | * tracer if the function graph tracer is not configured. | |
593 | */ | |
594 | #define __notrace_funcgraph notrace | |
595 | ||
bcbc4f20 FW |
596 | /* |
597 | * We want to which function is an entrypoint of a hardirq. | |
598 | * That will help us to put a signal on output. | |
599 | */ | |
600 | #define __irq_entry __attribute__((__section__(".irqentry.text"))) | |
601 | ||
602 | /* Limits of hardirq entrypoints */ | |
603 | extern char __irqentry_text_start[]; | |
604 | extern char __irqentry_text_end[]; | |
605 | ||
f201ae23 FW |
606 | #define FTRACE_RETFUNC_DEPTH 50 |
607 | #define FTRACE_RETSTACK_ALLOC_SIZE 32 | |
287b6e68 FW |
608 | extern int register_ftrace_graph(trace_func_graph_ret_t retfunc, |
609 | trace_func_graph_ent_t entryfunc); | |
610 | ||
14a866c5 SR |
611 | extern void ftrace_graph_stop(void); |
612 | ||
287b6e68 FW |
613 | /* The current handlers in use */ |
614 | extern trace_func_graph_ret_t ftrace_graph_return; | |
615 | extern trace_func_graph_ent_t ftrace_graph_entry; | |
caf4b323 | 616 | |
fb52607a | 617 | extern void unregister_ftrace_graph(void); |
f201ae23 | 618 | |
fb52607a FW |
619 | extern void ftrace_graph_init_task(struct task_struct *t); |
620 | extern void ftrace_graph_exit_task(struct task_struct *t); | |
868baf07 | 621 | extern void ftrace_graph_init_idle_task(struct task_struct *t, int cpu); |
21a8c466 FW |
622 | |
623 | static inline int task_curr_ret_stack(struct task_struct *t) | |
624 | { | |
625 | return t->curr_ret_stack; | |
626 | } | |
380c4b14 FW |
627 | |
628 | static inline void pause_graph_tracing(void) | |
629 | { | |
630 | atomic_inc(¤t->tracing_graph_pause); | |
631 | } | |
632 | ||
633 | static inline void unpause_graph_tracing(void) | |
634 | { | |
635 | atomic_dec(¤t->tracing_graph_pause); | |
636 | } | |
5ac9f622 | 637 | #else /* !CONFIG_FUNCTION_GRAPH_TRACER */ |
8b96f011 FW |
638 | |
639 | #define __notrace_funcgraph | |
bcbc4f20 | 640 | #define __irq_entry |
5ac9f622 | 641 | #define INIT_FTRACE_GRAPH |
8b96f011 | 642 | |
fb52607a FW |
643 | static inline void ftrace_graph_init_task(struct task_struct *t) { } |
644 | static inline void ftrace_graph_exit_task(struct task_struct *t) { } | |
868baf07 | 645 | static inline void ftrace_graph_init_idle_task(struct task_struct *t, int cpu) { } |
21a8c466 | 646 | |
62b915f1 JO |
647 | static inline int register_ftrace_graph(trace_func_graph_ret_t retfunc, |
648 | trace_func_graph_ent_t entryfunc) | |
649 | { | |
650 | return -1; | |
651 | } | |
652 | static inline void unregister_ftrace_graph(void) { } | |
653 | ||
21a8c466 FW |
654 | static inline int task_curr_ret_stack(struct task_struct *tsk) |
655 | { | |
656 | return -1; | |
657 | } | |
380c4b14 FW |
658 | |
659 | static inline void pause_graph_tracing(void) { } | |
660 | static inline void unpause_graph_tracing(void) { } | |
5ac9f622 | 661 | #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ |
caf4b323 | 662 | |
ea4e2bc4 | 663 | #ifdef CONFIG_TRACING |
ea4e2bc4 SR |
664 | |
665 | /* flags for current->trace */ | |
666 | enum { | |
667 | TSK_TRACE_FL_TRACE_BIT = 0, | |
668 | TSK_TRACE_FL_GRAPH_BIT = 1, | |
669 | }; | |
670 | enum { | |
671 | TSK_TRACE_FL_TRACE = 1 << TSK_TRACE_FL_TRACE_BIT, | |
672 | TSK_TRACE_FL_GRAPH = 1 << TSK_TRACE_FL_GRAPH_BIT, | |
673 | }; | |
674 | ||
675 | static inline void set_tsk_trace_trace(struct task_struct *tsk) | |
676 | { | |
677 | set_bit(TSK_TRACE_FL_TRACE_BIT, &tsk->trace); | |
678 | } | |
679 | ||
680 | static inline void clear_tsk_trace_trace(struct task_struct *tsk) | |
681 | { | |
682 | clear_bit(TSK_TRACE_FL_TRACE_BIT, &tsk->trace); | |
683 | } | |
684 | ||
685 | static inline int test_tsk_trace_trace(struct task_struct *tsk) | |
686 | { | |
687 | return tsk->trace & TSK_TRACE_FL_TRACE; | |
688 | } | |
689 | ||
690 | static inline void set_tsk_trace_graph(struct task_struct *tsk) | |
691 | { | |
692 | set_bit(TSK_TRACE_FL_GRAPH_BIT, &tsk->trace); | |
693 | } | |
694 | ||
695 | static inline void clear_tsk_trace_graph(struct task_struct *tsk) | |
696 | { | |
697 | clear_bit(TSK_TRACE_FL_GRAPH_BIT, &tsk->trace); | |
698 | } | |
699 | ||
700 | static inline int test_tsk_trace_graph(struct task_struct *tsk) | |
701 | { | |
702 | return tsk->trace & TSK_TRACE_FL_GRAPH; | |
703 | } | |
704 | ||
cecbca96 FW |
705 | enum ftrace_dump_mode; |
706 | ||
707 | extern enum ftrace_dump_mode ftrace_dump_on_oops; | |
526211bc | 708 | |
261842b7 SR |
709 | #ifdef CONFIG_PREEMPT |
710 | #define INIT_TRACE_RECURSION .trace_recursion = 0, | |
711 | #endif | |
712 | ||
ea4e2bc4 SR |
713 | #endif /* CONFIG_TRACING */ |
714 | ||
261842b7 SR |
715 | #ifndef INIT_TRACE_RECURSION |
716 | #define INIT_TRACE_RECURSION | |
717 | #endif | |
b1818748 | 718 | |
e7b8e675 MF |
719 | #ifdef CONFIG_FTRACE_SYSCALLS |
720 | ||
721 | unsigned long arch_syscall_addr(int nr); | |
722 | ||
723 | #endif /* CONFIG_FTRACE_SYSCALLS */ | |
724 | ||
16444a8a | 725 | #endif /* _LINUX_FTRACE_H */ |