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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> |
a1e2e31d | 13 | #include <linux/ptrace.h> |
0012693a | 14 | #include <linux/ktime.h> |
21a8c466 | 15 | #include <linux/sched.h> |
0012693a FW |
16 | #include <linux/types.h> |
17 | #include <linux/init.h> | |
18 | #include <linux/fs.h> | |
16444a8a | 19 | |
c79a61f5 UKK |
20 | #include <asm/ftrace.h> |
21 | ||
2f5f6ad9 SR |
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 | ||
ccf3672d SR |
31 | /* |
32 | * If the arch's mcount caller does not support all of ftrace's | |
33 | * features, then it must call an indirect function that | |
34 | * does. Or at least does enough to prevent any unwelcomed side effects. | |
35 | */ | |
36 | #if !defined(CONFIG_HAVE_FUNCTION_TRACE_MCOUNT_TEST) || \ | |
37 | !ARCH_SUPPORTS_FTRACE_OPS | |
38 | # define FTRACE_FORCE_LIST_FUNC 1 | |
39 | #else | |
40 | # define FTRACE_FORCE_LIST_FUNC 0 | |
41 | #endif | |
42 | ||
43 | ||
de477254 | 44 | struct module; |
04da85b8 SR |
45 | struct ftrace_hash; |
46 | ||
606576ce | 47 | #ifdef CONFIG_FUNCTION_TRACER |
3e1932ad | 48 | |
b0fc494f SR |
49 | extern int ftrace_enabled; |
50 | extern int | |
51 | ftrace_enable_sysctl(struct ctl_table *table, int write, | |
8d65af78 | 52 | void __user *buffer, size_t *lenp, |
b0fc494f SR |
53 | loff_t *ppos); |
54 | ||
2f5f6ad9 SR |
55 | struct ftrace_ops; |
56 | ||
57 | typedef void (*ftrace_func_t)(unsigned long ip, unsigned long parent_ip, | |
a1e2e31d | 58 | struct ftrace_ops *op, struct pt_regs *regs); |
16444a8a | 59 | |
e248491a JO |
60 | /* |
61 | * FTRACE_OPS_FL_* bits denote the state of ftrace_ops struct and are | |
62 | * set in the flags member. | |
63 | * | |
64 | * ENABLED - set/unset when ftrace_ops is registered/unregistered | |
65 | * GLOBAL - set manualy by ftrace_ops user to denote the ftrace_ops | |
66 | * is part of the global tracers sharing the same filter | |
67 | * via set_ftrace_* debugfs files. | |
68 | * DYNAMIC - set when ftrace_ops is registered to denote dynamically | |
69 | * allocated ftrace_ops which need special care | |
70 | * CONTROL - set manualy by ftrace_ops user to denote the ftrace_ops | |
71 | * could be controled by following calls: | |
72 | * ftrace_function_local_enable | |
73 | * ftrace_function_local_disable | |
74 | */ | |
b848914c SR |
75 | enum { |
76 | FTRACE_OPS_FL_ENABLED = 1 << 0, | |
77 | FTRACE_OPS_FL_GLOBAL = 1 << 1, | |
cdbe61bf | 78 | FTRACE_OPS_FL_DYNAMIC = 1 << 2, |
e248491a | 79 | FTRACE_OPS_FL_CONTROL = 1 << 3, |
b848914c SR |
80 | }; |
81 | ||
16444a8a | 82 | struct ftrace_ops { |
f45948e8 SR |
83 | ftrace_func_t func; |
84 | struct ftrace_ops *next; | |
b848914c | 85 | unsigned long flags; |
e248491a | 86 | int __percpu *disabled; |
f45948e8 SR |
87 | #ifdef CONFIG_DYNAMIC_FTRACE |
88 | struct ftrace_hash *notrace_hash; | |
89 | struct ftrace_hash *filter_hash; | |
90 | #endif | |
16444a8a ACM |
91 | }; |
92 | ||
60a7ecf4 SR |
93 | extern int function_trace_stop; |
94 | ||
e7d3737e FW |
95 | /* |
96 | * Type of the current tracing. | |
97 | */ | |
98 | enum ftrace_tracing_type_t { | |
99 | FTRACE_TYPE_ENTER = 0, /* Hook the call of the function */ | |
100 | FTRACE_TYPE_RETURN, /* Hook the return of the function */ | |
101 | }; | |
102 | ||
103 | /* Current tracing type, default is FTRACE_TYPE_ENTER */ | |
104 | extern enum ftrace_tracing_type_t ftrace_tracing_type; | |
105 | ||
60a7ecf4 SR |
106 | /** |
107 | * ftrace_stop - stop function tracer. | |
108 | * | |
109 | * A quick way to stop the function tracer. Note this an on off switch, | |
110 | * it is not something that is recursive like preempt_disable. | |
111 | * This does not disable the calling of mcount, it only stops the | |
112 | * calling of functions from mcount. | |
113 | */ | |
114 | static inline void ftrace_stop(void) | |
115 | { | |
116 | function_trace_stop = 1; | |
117 | } | |
118 | ||
119 | /** | |
120 | * ftrace_start - start the function tracer. | |
121 | * | |
122 | * This function is the inverse of ftrace_stop. This does not enable | |
123 | * the function tracing if the function tracer is disabled. This only | |
124 | * sets the function tracer flag to continue calling the functions | |
125 | * from mcount. | |
126 | */ | |
127 | static inline void ftrace_start(void) | |
128 | { | |
129 | function_trace_stop = 0; | |
130 | } | |
131 | ||
16444a8a ACM |
132 | /* |
133 | * The ftrace_ops must be a static and should also | |
134 | * be read_mostly. These functions do modify read_mostly variables | |
135 | * so use them sparely. Never free an ftrace_op or modify the | |
136 | * next pointer after it has been registered. Even after unregistering | |
137 | * it, the next pointer may still be used internally. | |
138 | */ | |
139 | int register_ftrace_function(struct ftrace_ops *ops); | |
140 | int unregister_ftrace_function(struct ftrace_ops *ops); | |
141 | void clear_ftrace_function(void); | |
142 | ||
e248491a JO |
143 | /** |
144 | * ftrace_function_local_enable - enable controlled ftrace_ops on current cpu | |
145 | * | |
146 | * This function enables tracing on current cpu by decreasing | |
147 | * the per cpu control variable. | |
148 | * It must be called with preemption disabled and only on ftrace_ops | |
149 | * registered with FTRACE_OPS_FL_CONTROL. If called without preemption | |
150 | * disabled, this_cpu_ptr will complain when CONFIG_DEBUG_PREEMPT is enabled. | |
151 | */ | |
152 | static inline void ftrace_function_local_enable(struct ftrace_ops *ops) | |
153 | { | |
154 | if (WARN_ON_ONCE(!(ops->flags & FTRACE_OPS_FL_CONTROL))) | |
155 | return; | |
156 | ||
157 | (*this_cpu_ptr(ops->disabled))--; | |
158 | } | |
159 | ||
160 | /** | |
161 | * ftrace_function_local_disable - enable controlled ftrace_ops on current cpu | |
162 | * | |
163 | * This function enables tracing on current cpu by decreasing | |
164 | * the per cpu control variable. | |
165 | * It must be called with preemption disabled and only on ftrace_ops | |
166 | * registered with FTRACE_OPS_FL_CONTROL. If called without preemption | |
167 | * disabled, this_cpu_ptr will complain when CONFIG_DEBUG_PREEMPT is enabled. | |
168 | */ | |
169 | static inline void ftrace_function_local_disable(struct ftrace_ops *ops) | |
170 | { | |
171 | if (WARN_ON_ONCE(!(ops->flags & FTRACE_OPS_FL_CONTROL))) | |
172 | return; | |
173 | ||
174 | (*this_cpu_ptr(ops->disabled))++; | |
175 | } | |
176 | ||
177 | /** | |
178 | * ftrace_function_local_disabled - returns ftrace_ops disabled value | |
179 | * on current cpu | |
180 | * | |
181 | * This function returns value of ftrace_ops::disabled on current cpu. | |
182 | * It must be called with preemption disabled and only on ftrace_ops | |
183 | * registered with FTRACE_OPS_FL_CONTROL. If called without preemption | |
184 | * disabled, this_cpu_ptr will complain when CONFIG_DEBUG_PREEMPT is enabled. | |
185 | */ | |
186 | static inline int ftrace_function_local_disabled(struct ftrace_ops *ops) | |
187 | { | |
188 | WARN_ON_ONCE(!(ops->flags & FTRACE_OPS_FL_CONTROL)); | |
189 | return *this_cpu_ptr(ops->disabled); | |
190 | } | |
191 | ||
a1e2e31d SR |
192 | extern void ftrace_stub(unsigned long a0, unsigned long a1, |
193 | struct ftrace_ops *op, struct pt_regs *regs); | |
16444a8a | 194 | |
606576ce | 195 | #else /* !CONFIG_FUNCTION_TRACER */ |
4dbf6bc2 SR |
196 | /* |
197 | * (un)register_ftrace_function must be a macro since the ops parameter | |
198 | * must not be evaluated. | |
199 | */ | |
200 | #define register_ftrace_function(ops) ({ 0; }) | |
201 | #define unregister_ftrace_function(ops) ({ 0; }) | |
202 | static inline void clear_ftrace_function(void) { } | |
81adbdc0 | 203 | static inline void ftrace_kill(void) { } |
60a7ecf4 SR |
204 | static inline void ftrace_stop(void) { } |
205 | static inline void ftrace_start(void) { } | |
606576ce | 206 | #endif /* CONFIG_FUNCTION_TRACER */ |
352ad25a | 207 | |
f38f1d2a SR |
208 | #ifdef CONFIG_STACK_TRACER |
209 | extern int stack_tracer_enabled; | |
210 | int | |
211 | stack_trace_sysctl(struct ctl_table *table, int write, | |
8d65af78 | 212 | void __user *buffer, size_t *lenp, |
f38f1d2a SR |
213 | loff_t *ppos); |
214 | #endif | |
215 | ||
f6180773 SR |
216 | struct ftrace_func_command { |
217 | struct list_head list; | |
218 | char *name; | |
43dd61c9 SR |
219 | int (*func)(struct ftrace_hash *hash, |
220 | char *func, char *cmd, | |
f6180773 SR |
221 | char *params, int enable); |
222 | }; | |
223 | ||
3d083395 | 224 | #ifdef CONFIG_DYNAMIC_FTRACE |
31e88909 | 225 | |
000ab691 SR |
226 | int ftrace_arch_code_modify_prepare(void); |
227 | int ftrace_arch_code_modify_post_process(void); | |
228 | ||
c88fd863 SR |
229 | void ftrace_bug(int err, unsigned long ip); |
230 | ||
809dcf29 SR |
231 | struct seq_file; |
232 | ||
b6887d79 | 233 | struct ftrace_probe_ops { |
59df055f SR |
234 | void (*func)(unsigned long ip, |
235 | unsigned long parent_ip, | |
236 | void **data); | |
237 | int (*callback)(unsigned long ip, void **data); | |
238 | void (*free)(void **data); | |
809dcf29 SR |
239 | int (*print)(struct seq_file *m, |
240 | unsigned long ip, | |
b6887d79 | 241 | struct ftrace_probe_ops *ops, |
809dcf29 | 242 | void *data); |
59df055f SR |
243 | }; |
244 | ||
245 | extern int | |
b6887d79 | 246 | register_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops, |
59df055f SR |
247 | void *data); |
248 | extern void | |
b6887d79 | 249 | unregister_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops, |
59df055f SR |
250 | void *data); |
251 | extern void | |
b6887d79 SR |
252 | unregister_ftrace_function_probe_func(char *glob, struct ftrace_probe_ops *ops); |
253 | extern void unregister_ftrace_function_probe_all(char *glob); | |
59df055f | 254 | |
2cfa1978 MH |
255 | extern int ftrace_text_reserved(void *start, void *end); |
256 | ||
3c1720f0 | 257 | enum { |
ed926f9b | 258 | FTRACE_FL_ENABLED = (1 << 30), |
3c1720f0 SR |
259 | }; |
260 | ||
ed926f9b SR |
261 | #define FTRACE_FL_MASK (0x3UL << 30) |
262 | #define FTRACE_REF_MAX ((1 << 30) - 1) | |
263 | ||
3d083395 | 264 | struct dyn_ftrace { |
ee000b7f LJ |
265 | union { |
266 | unsigned long ip; /* address of mcount call-site */ | |
267 | struct dyn_ftrace *freelist; | |
268 | }; | |
85ae32ae | 269 | unsigned long flags; |
ee000b7f | 270 | struct dyn_arch_ftrace arch; |
3d083395 SR |
271 | }; |
272 | ||
e1c08bdd | 273 | int ftrace_force_update(void); |
ac483c44 | 274 | int ftrace_set_filter(struct ftrace_ops *ops, unsigned char *buf, |
936e074b | 275 | int len, int reset); |
ac483c44 | 276 | int ftrace_set_notrace(struct ftrace_ops *ops, unsigned char *buf, |
936e074b SR |
277 | int len, int reset); |
278 | void ftrace_set_global_filter(unsigned char *buf, int len, int reset); | |
279 | void ftrace_set_global_notrace(unsigned char *buf, int len, int reset); | |
5500fa51 | 280 | void ftrace_free_filter(struct ftrace_ops *ops); |
e1c08bdd | 281 | |
f6180773 SR |
282 | int register_ftrace_command(struct ftrace_func_command *cmd); |
283 | int unregister_ftrace_command(struct ftrace_func_command *cmd); | |
284 | ||
c88fd863 SR |
285 | enum { |
286 | FTRACE_UPDATE_CALLS = (1 << 0), | |
287 | FTRACE_DISABLE_CALLS = (1 << 1), | |
288 | FTRACE_UPDATE_TRACE_FUNC = (1 << 2), | |
289 | FTRACE_START_FUNC_RET = (1 << 3), | |
290 | FTRACE_STOP_FUNC_RET = (1 << 4), | |
291 | }; | |
292 | ||
293 | enum { | |
294 | FTRACE_UPDATE_IGNORE, | |
295 | FTRACE_UPDATE_MAKE_CALL, | |
296 | FTRACE_UPDATE_MAKE_NOP, | |
297 | }; | |
298 | ||
fc13cb0c SR |
299 | enum { |
300 | FTRACE_ITER_FILTER = (1 << 0), | |
301 | FTRACE_ITER_NOTRACE = (1 << 1), | |
302 | FTRACE_ITER_PRINTALL = (1 << 2), | |
69a3083c SR |
303 | FTRACE_ITER_DO_HASH = (1 << 3), |
304 | FTRACE_ITER_HASH = (1 << 4), | |
305 | FTRACE_ITER_ENABLED = (1 << 5), | |
fc13cb0c SR |
306 | }; |
307 | ||
c88fd863 SR |
308 | void arch_ftrace_update_code(int command); |
309 | ||
310 | struct ftrace_rec_iter; | |
311 | ||
312 | struct ftrace_rec_iter *ftrace_rec_iter_start(void); | |
313 | struct ftrace_rec_iter *ftrace_rec_iter_next(struct ftrace_rec_iter *iter); | |
314 | struct dyn_ftrace *ftrace_rec_iter_record(struct ftrace_rec_iter *iter); | |
315 | ||
08d636b6 SR |
316 | #define for_ftrace_rec_iter(iter) \ |
317 | for (iter = ftrace_rec_iter_start(); \ | |
318 | iter; \ | |
319 | iter = ftrace_rec_iter_next(iter)) | |
320 | ||
321 | ||
c88fd863 SR |
322 | int ftrace_update_record(struct dyn_ftrace *rec, int enable); |
323 | int ftrace_test_record(struct dyn_ftrace *rec, int enable); | |
324 | void ftrace_run_stop_machine(int command); | |
f0cf973a | 325 | unsigned long ftrace_location(unsigned long ip); |
c88fd863 SR |
326 | |
327 | extern ftrace_func_t ftrace_trace_function; | |
328 | ||
fc13cb0c SR |
329 | int ftrace_regex_open(struct ftrace_ops *ops, int flag, |
330 | struct inode *inode, struct file *file); | |
331 | ssize_t ftrace_filter_write(struct file *file, const char __user *ubuf, | |
332 | size_t cnt, loff_t *ppos); | |
333 | ssize_t ftrace_notrace_write(struct file *file, const char __user *ubuf, | |
334 | size_t cnt, loff_t *ppos); | |
335 | loff_t ftrace_regex_lseek(struct file *file, loff_t offset, int origin); | |
336 | int ftrace_regex_release(struct inode *inode, struct file *file); | |
337 | ||
2a85a37f SR |
338 | void __init |
339 | ftrace_set_early_filter(struct ftrace_ops *ops, char *buf, int enable); | |
340 | ||
3d083395 | 341 | /* defined in arch */ |
3c1720f0 | 342 | extern int ftrace_ip_converted(unsigned long ip); |
d61f82d0 | 343 | extern int ftrace_dyn_arch_init(void *data); |
e4f5d544 | 344 | extern void ftrace_replace_code(int enable); |
d61f82d0 SR |
345 | extern int ftrace_update_ftrace_func(ftrace_func_t func); |
346 | extern void ftrace_caller(void); | |
347 | extern void ftrace_call(void); | |
348 | extern void mcount_call(void); | |
f0001207 | 349 | |
8ed3e2cf SR |
350 | void ftrace_modify_all_code(int command); |
351 | ||
f0001207 SL |
352 | #ifndef FTRACE_ADDR |
353 | #define FTRACE_ADDR ((unsigned long)ftrace_caller) | |
354 | #endif | |
fb52607a FW |
355 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
356 | extern void ftrace_graph_caller(void); | |
5a45cfe1 SR |
357 | extern int ftrace_enable_ftrace_graph_caller(void); |
358 | extern int ftrace_disable_ftrace_graph_caller(void); | |
359 | #else | |
360 | static inline int ftrace_enable_ftrace_graph_caller(void) { return 0; } | |
361 | static inline int ftrace_disable_ftrace_graph_caller(void) { return 0; } | |
e7d3737e | 362 | #endif |
ad90c0e3 | 363 | |
31e88909 | 364 | /** |
57794a9d | 365 | * ftrace_make_nop - convert code into nop |
31e88909 SR |
366 | * @mod: module structure if called by module load initialization |
367 | * @rec: the mcount call site record | |
368 | * @addr: the address that the call site should be calling | |
369 | * | |
370 | * This is a very sensitive operation and great care needs | |
371 | * to be taken by the arch. The operation should carefully | |
372 | * read the location, check to see if what is read is indeed | |
373 | * what we expect it to be, and then on success of the compare, | |
374 | * it should write to the location. | |
375 | * | |
376 | * The code segment at @rec->ip should be a caller to @addr | |
377 | * | |
378 | * Return must be: | |
379 | * 0 on success | |
380 | * -EFAULT on error reading the location | |
381 | * -EINVAL on a failed compare of the contents | |
382 | * -EPERM on error writing to the location | |
383 | * Any other value will be considered a failure. | |
384 | */ | |
385 | extern int ftrace_make_nop(struct module *mod, | |
386 | struct dyn_ftrace *rec, unsigned long addr); | |
a26a2a27 | 387 | |
593eb8a2 | 388 | /** |
31e88909 SR |
389 | * ftrace_make_call - convert a nop call site into a call to addr |
390 | * @rec: the mcount call site record | |
391 | * @addr: the address that the call site should call | |
593eb8a2 SR |
392 | * |
393 | * This is a very sensitive operation and great care needs | |
394 | * to be taken by the arch. The operation should carefully | |
395 | * read the location, check to see if what is read is indeed | |
396 | * what we expect it to be, and then on success of the compare, | |
397 | * it should write to the location. | |
398 | * | |
31e88909 SR |
399 | * The code segment at @rec->ip should be a nop |
400 | * | |
593eb8a2 SR |
401 | * Return must be: |
402 | * 0 on success | |
403 | * -EFAULT on error reading the location | |
404 | * -EINVAL on a failed compare of the contents | |
405 | * -EPERM on error writing to the location | |
406 | * Any other value will be considered a failure. | |
407 | */ | |
31e88909 SR |
408 | extern int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr); |
409 | ||
31e88909 SR |
410 | /* May be defined in arch */ |
411 | extern int ftrace_arch_read_dyn_info(char *buf, int size); | |
593eb8a2 | 412 | |
ecea656d AS |
413 | extern int skip_trace(unsigned long ip); |
414 | ||
c0719e5a SR |
415 | extern void ftrace_disable_daemon(void); |
416 | extern void ftrace_enable_daemon(void); | |
e1c08bdd | 417 | #else |
4dbf6bc2 SR |
418 | static inline int skip_trace(unsigned long ip) { return 0; } |
419 | static inline int ftrace_force_update(void) { return 0; } | |
4dbf6bc2 SR |
420 | static inline void ftrace_disable_daemon(void) { } |
421 | static inline void ftrace_enable_daemon(void) { } | |
e7247a15 | 422 | static inline void ftrace_release_mod(struct module *mod) {} |
f6180773 SR |
423 | static inline int register_ftrace_command(struct ftrace_func_command *cmd) |
424 | { | |
97d0bb8d | 425 | return -EINVAL; |
f6180773 SR |
426 | } |
427 | static inline int unregister_ftrace_command(char *cmd_name) | |
428 | { | |
97d0bb8d | 429 | return -EINVAL; |
f6180773 | 430 | } |
2cfa1978 MH |
431 | static inline int ftrace_text_reserved(void *start, void *end) |
432 | { | |
433 | return 0; | |
434 | } | |
fc13cb0c SR |
435 | |
436 | /* | |
437 | * Again users of functions that have ftrace_ops may not | |
438 | * have them defined when ftrace is not enabled, but these | |
439 | * functions may still be called. Use a macro instead of inline. | |
440 | */ | |
441 | #define ftrace_regex_open(ops, flag, inod, file) ({ -ENODEV; }) | |
96de37b6 | 442 | #define ftrace_set_early_filter(ops, buf, enable) do { } while (0) |
5500fa51 JO |
443 | #define ftrace_set_filter(ops, buf, len, reset) ({ -ENODEV; }) |
444 | #define ftrace_set_notrace(ops, buf, len, reset) ({ -ENODEV; }) | |
445 | #define ftrace_free_filter(ops) do { } while (0) | |
fc13cb0c SR |
446 | |
447 | static inline ssize_t ftrace_filter_write(struct file *file, const char __user *ubuf, | |
448 | size_t cnt, loff_t *ppos) { return -ENODEV; } | |
449 | static inline ssize_t ftrace_notrace_write(struct file *file, const char __user *ubuf, | |
450 | size_t cnt, loff_t *ppos) { return -ENODEV; } | |
451 | static inline loff_t ftrace_regex_lseek(struct file *file, loff_t offset, int origin) | |
452 | { | |
453 | return -ENODEV; | |
454 | } | |
455 | static inline int | |
456 | ftrace_regex_release(struct inode *inode, struct file *file) { return -ENODEV; } | |
ecea656d | 457 | #endif /* CONFIG_DYNAMIC_FTRACE */ |
352ad25a | 458 | |
aeaee8a2 IM |
459 | /* totally disable ftrace - can not re-enable after this */ |
460 | void ftrace_kill(void); | |
461 | ||
f43fdad8 IM |
462 | static inline void tracer_disable(void) |
463 | { | |
606576ce | 464 | #ifdef CONFIG_FUNCTION_TRACER |
f43fdad8 IM |
465 | ftrace_enabled = 0; |
466 | #endif | |
467 | } | |
468 | ||
37002735 HY |
469 | /* |
470 | * Ftrace disable/restore without lock. Some synchronization mechanism | |
9bdeb7b5 | 471 | * must be used to prevent ftrace_enabled to be changed between |
37002735 HY |
472 | * disable/restore. |
473 | */ | |
9bdeb7b5 HY |
474 | static inline int __ftrace_enabled_save(void) |
475 | { | |
606576ce | 476 | #ifdef CONFIG_FUNCTION_TRACER |
9bdeb7b5 HY |
477 | int saved_ftrace_enabled = ftrace_enabled; |
478 | ftrace_enabled = 0; | |
479 | return saved_ftrace_enabled; | |
480 | #else | |
481 | return 0; | |
482 | #endif | |
483 | } | |
484 | ||
485 | static inline void __ftrace_enabled_restore(int enabled) | |
486 | { | |
606576ce | 487 | #ifdef CONFIG_FUNCTION_TRACER |
9bdeb7b5 HY |
488 | ftrace_enabled = enabled; |
489 | #endif | |
490 | } | |
491 | ||
c79a61f5 UKK |
492 | #ifndef HAVE_ARCH_CALLER_ADDR |
493 | # ifdef CONFIG_FRAME_POINTER | |
494 | # define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0)) | |
495 | # define CALLER_ADDR1 ((unsigned long)__builtin_return_address(1)) | |
496 | # define CALLER_ADDR2 ((unsigned long)__builtin_return_address(2)) | |
497 | # define CALLER_ADDR3 ((unsigned long)__builtin_return_address(3)) | |
498 | # define CALLER_ADDR4 ((unsigned long)__builtin_return_address(4)) | |
499 | # define CALLER_ADDR5 ((unsigned long)__builtin_return_address(5)) | |
500 | # define CALLER_ADDR6 ((unsigned long)__builtin_return_address(6)) | |
501 | # else | |
502 | # define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0)) | |
503 | # define CALLER_ADDR1 0UL | |
504 | # define CALLER_ADDR2 0UL | |
505 | # define CALLER_ADDR3 0UL | |
506 | # define CALLER_ADDR4 0UL | |
507 | # define CALLER_ADDR5 0UL | |
508 | # define CALLER_ADDR6 0UL | |
509 | # endif | |
510 | #endif /* ifndef HAVE_ARCH_CALLER_ADDR */ | |
352ad25a | 511 | |
81d68a96 | 512 | #ifdef CONFIG_IRQSOFF_TRACER |
489f1396 IM |
513 | extern void time_hardirqs_on(unsigned long a0, unsigned long a1); |
514 | extern void time_hardirqs_off(unsigned long a0, unsigned long a1); | |
81d68a96 | 515 | #else |
4dbf6bc2 SR |
516 | static inline void time_hardirqs_on(unsigned long a0, unsigned long a1) { } |
517 | static inline void time_hardirqs_off(unsigned long a0, unsigned long a1) { } | |
81d68a96 SR |
518 | #endif |
519 | ||
6cd8a4bb | 520 | #ifdef CONFIG_PREEMPT_TRACER |
489f1396 IM |
521 | extern void trace_preempt_on(unsigned long a0, unsigned long a1); |
522 | extern void trace_preempt_off(unsigned long a0, unsigned long a1); | |
6cd8a4bb | 523 | #else |
b02ee9a3 MB |
524 | /* |
525 | * Use defines instead of static inlines because some arches will make code out | |
526 | * of the CALLER_ADDR, when we really want these to be a real nop. | |
527 | */ | |
528 | # define trace_preempt_on(a0, a1) do { } while (0) | |
529 | # define trace_preempt_off(a0, a1) do { } while (0) | |
6cd8a4bb SR |
530 | #endif |
531 | ||
68bf21aa SR |
532 | #ifdef CONFIG_FTRACE_MCOUNT_RECORD |
533 | extern void ftrace_init(void); | |
534 | #else | |
535 | static inline void ftrace_init(void) { } | |
536 | #endif | |
537 | ||
287b6e68 FW |
538 | /* |
539 | * Structure that defines an entry function trace. | |
540 | */ | |
541 | struct ftrace_graph_ent { | |
542 | unsigned long func; /* Current function */ | |
543 | int depth; | |
544 | }; | |
dd0e545f | 545 | |
caf4b323 FW |
546 | /* |
547 | * Structure that defines a return function trace. | |
548 | */ | |
fb52607a | 549 | struct ftrace_graph_ret { |
caf4b323 FW |
550 | unsigned long func; /* Current function */ |
551 | unsigned long long calltime; | |
552 | unsigned long long rettime; | |
0231022c FW |
553 | /* Number of functions that overran the depth limit for current task */ |
554 | unsigned long overrun; | |
287b6e68 | 555 | int depth; |
caf4b323 FW |
556 | }; |
557 | ||
62b915f1 JO |
558 | /* Type of the callback handlers for tracing function graph*/ |
559 | typedef void (*trace_func_graph_ret_t)(struct ftrace_graph_ret *); /* return */ | |
560 | typedef int (*trace_func_graph_ent_t)(struct ftrace_graph_ent *); /* entry */ | |
561 | ||
fb52607a | 562 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
8b96f011 | 563 | |
5ac9f622 | 564 | /* for init task */ |
f876d346 | 565 | #define INIT_FTRACE_GRAPH .ret_stack = NULL, |
5ac9f622 | 566 | |
712406a6 SR |
567 | /* |
568 | * Stack of return addresses for functions | |
569 | * of a thread. | |
570 | * Used in struct thread_info | |
571 | */ | |
572 | struct ftrace_ret_stack { | |
573 | unsigned long ret; | |
574 | unsigned long func; | |
575 | unsigned long long calltime; | |
a2a16d6a | 576 | unsigned long long subtime; |
71e308a2 | 577 | unsigned long fp; |
712406a6 SR |
578 | }; |
579 | ||
580 | /* | |
581 | * Primary handler of a function return. | |
582 | * It relays on ftrace_return_to_handler. | |
583 | * Defined in entry_32/64.S | |
584 | */ | |
585 | extern void return_to_handler(void); | |
586 | ||
587 | extern int | |
71e308a2 SR |
588 | ftrace_push_return_trace(unsigned long ret, unsigned long func, int *depth, |
589 | unsigned long frame_pointer); | |
712406a6 | 590 | |
8b96f011 FW |
591 | /* |
592 | * Sometimes we don't want to trace a function with the function | |
593 | * graph tracer but we want them to keep traced by the usual function | |
594 | * tracer if the function graph tracer is not configured. | |
595 | */ | |
596 | #define __notrace_funcgraph notrace | |
597 | ||
bcbc4f20 FW |
598 | /* |
599 | * We want to which function is an entrypoint of a hardirq. | |
600 | * That will help us to put a signal on output. | |
601 | */ | |
602 | #define __irq_entry __attribute__((__section__(".irqentry.text"))) | |
603 | ||
604 | /* Limits of hardirq entrypoints */ | |
605 | extern char __irqentry_text_start[]; | |
606 | extern char __irqentry_text_end[]; | |
607 | ||
f201ae23 FW |
608 | #define FTRACE_RETFUNC_DEPTH 50 |
609 | #define FTRACE_RETSTACK_ALLOC_SIZE 32 | |
287b6e68 FW |
610 | extern int register_ftrace_graph(trace_func_graph_ret_t retfunc, |
611 | trace_func_graph_ent_t entryfunc); | |
612 | ||
14a866c5 SR |
613 | extern void ftrace_graph_stop(void); |
614 | ||
287b6e68 FW |
615 | /* The current handlers in use */ |
616 | extern trace_func_graph_ret_t ftrace_graph_return; | |
617 | extern trace_func_graph_ent_t ftrace_graph_entry; | |
caf4b323 | 618 | |
fb52607a | 619 | extern void unregister_ftrace_graph(void); |
f201ae23 | 620 | |
fb52607a FW |
621 | extern void ftrace_graph_init_task(struct task_struct *t); |
622 | extern void ftrace_graph_exit_task(struct task_struct *t); | |
868baf07 | 623 | extern void ftrace_graph_init_idle_task(struct task_struct *t, int cpu); |
21a8c466 FW |
624 | |
625 | static inline int task_curr_ret_stack(struct task_struct *t) | |
626 | { | |
627 | return t->curr_ret_stack; | |
628 | } | |
380c4b14 FW |
629 | |
630 | static inline void pause_graph_tracing(void) | |
631 | { | |
632 | atomic_inc(¤t->tracing_graph_pause); | |
633 | } | |
634 | ||
635 | static inline void unpause_graph_tracing(void) | |
636 | { | |
637 | atomic_dec(¤t->tracing_graph_pause); | |
638 | } | |
5ac9f622 | 639 | #else /* !CONFIG_FUNCTION_GRAPH_TRACER */ |
8b96f011 FW |
640 | |
641 | #define __notrace_funcgraph | |
bcbc4f20 | 642 | #define __irq_entry |
5ac9f622 | 643 | #define INIT_FTRACE_GRAPH |
8b96f011 | 644 | |
fb52607a FW |
645 | static inline void ftrace_graph_init_task(struct task_struct *t) { } |
646 | static inline void ftrace_graph_exit_task(struct task_struct *t) { } | |
868baf07 | 647 | static inline void ftrace_graph_init_idle_task(struct task_struct *t, int cpu) { } |
21a8c466 | 648 | |
62b915f1 JO |
649 | static inline int register_ftrace_graph(trace_func_graph_ret_t retfunc, |
650 | trace_func_graph_ent_t entryfunc) | |
651 | { | |
652 | return -1; | |
653 | } | |
654 | static inline void unregister_ftrace_graph(void) { } | |
655 | ||
21a8c466 FW |
656 | static inline int task_curr_ret_stack(struct task_struct *tsk) |
657 | { | |
658 | return -1; | |
659 | } | |
380c4b14 FW |
660 | |
661 | static inline void pause_graph_tracing(void) { } | |
662 | static inline void unpause_graph_tracing(void) { } | |
5ac9f622 | 663 | #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ |
caf4b323 | 664 | |
ea4e2bc4 | 665 | #ifdef CONFIG_TRACING |
ea4e2bc4 SR |
666 | |
667 | /* flags for current->trace */ | |
668 | enum { | |
669 | TSK_TRACE_FL_TRACE_BIT = 0, | |
670 | TSK_TRACE_FL_GRAPH_BIT = 1, | |
671 | }; | |
672 | enum { | |
673 | TSK_TRACE_FL_TRACE = 1 << TSK_TRACE_FL_TRACE_BIT, | |
674 | TSK_TRACE_FL_GRAPH = 1 << TSK_TRACE_FL_GRAPH_BIT, | |
675 | }; | |
676 | ||
677 | static inline void set_tsk_trace_trace(struct task_struct *tsk) | |
678 | { | |
679 | set_bit(TSK_TRACE_FL_TRACE_BIT, &tsk->trace); | |
680 | } | |
681 | ||
682 | static inline void clear_tsk_trace_trace(struct task_struct *tsk) | |
683 | { | |
684 | clear_bit(TSK_TRACE_FL_TRACE_BIT, &tsk->trace); | |
685 | } | |
686 | ||
687 | static inline int test_tsk_trace_trace(struct task_struct *tsk) | |
688 | { | |
689 | return tsk->trace & TSK_TRACE_FL_TRACE; | |
690 | } | |
691 | ||
692 | static inline void set_tsk_trace_graph(struct task_struct *tsk) | |
693 | { | |
694 | set_bit(TSK_TRACE_FL_GRAPH_BIT, &tsk->trace); | |
695 | } | |
696 | ||
697 | static inline void clear_tsk_trace_graph(struct task_struct *tsk) | |
698 | { | |
699 | clear_bit(TSK_TRACE_FL_GRAPH_BIT, &tsk->trace); | |
700 | } | |
701 | ||
702 | static inline int test_tsk_trace_graph(struct task_struct *tsk) | |
703 | { | |
704 | return tsk->trace & TSK_TRACE_FL_GRAPH; | |
705 | } | |
706 | ||
cecbca96 FW |
707 | enum ftrace_dump_mode; |
708 | ||
709 | extern enum ftrace_dump_mode ftrace_dump_on_oops; | |
526211bc | 710 | |
261842b7 SR |
711 | #ifdef CONFIG_PREEMPT |
712 | #define INIT_TRACE_RECURSION .trace_recursion = 0, | |
713 | #endif | |
714 | ||
ea4e2bc4 SR |
715 | #endif /* CONFIG_TRACING */ |
716 | ||
261842b7 SR |
717 | #ifndef INIT_TRACE_RECURSION |
718 | #define INIT_TRACE_RECURSION | |
719 | #endif | |
b1818748 | 720 | |
e7b8e675 MF |
721 | #ifdef CONFIG_FTRACE_SYSCALLS |
722 | ||
723 | unsigned long arch_syscall_addr(int nr); | |
724 | ||
725 | #endif /* CONFIG_FTRACE_SYSCALLS */ | |
726 | ||
16444a8a | 727 | #endif /* _LINUX_FTRACE_H */ |