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