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 | ||
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 | ||
3d083395 | 238 | /* defined in arch */ |
3c1720f0 | 239 | extern int ftrace_ip_converted(unsigned long ip); |
d61f82d0 | 240 | extern int ftrace_dyn_arch_init(void *data); |
d61f82d0 SR |
241 | extern int ftrace_update_ftrace_func(ftrace_func_t func); |
242 | extern void ftrace_caller(void); | |
243 | extern void ftrace_call(void); | |
244 | extern void mcount_call(void); | |
f0001207 SL |
245 | |
246 | #ifndef FTRACE_ADDR | |
247 | #define FTRACE_ADDR ((unsigned long)ftrace_caller) | |
248 | #endif | |
fb52607a FW |
249 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
250 | extern void ftrace_graph_caller(void); | |
5a45cfe1 SR |
251 | extern int ftrace_enable_ftrace_graph_caller(void); |
252 | extern int ftrace_disable_ftrace_graph_caller(void); | |
253 | #else | |
254 | static inline int ftrace_enable_ftrace_graph_caller(void) { return 0; } | |
255 | static inline int ftrace_disable_ftrace_graph_caller(void) { return 0; } | |
e7d3737e | 256 | #endif |
ad90c0e3 | 257 | |
31e88909 | 258 | /** |
57794a9d | 259 | * ftrace_make_nop - convert code into nop |
31e88909 SR |
260 | * @mod: module structure if called by module load initialization |
261 | * @rec: the mcount call site record | |
262 | * @addr: the address that the call site should be calling | |
263 | * | |
264 | * This is a very sensitive operation and great care needs | |
265 | * to be taken by the arch. The operation should carefully | |
266 | * read the location, check to see if what is read is indeed | |
267 | * what we expect it to be, and then on success of the compare, | |
268 | * it should write to the location. | |
269 | * | |
270 | * The code segment at @rec->ip should be a caller to @addr | |
271 | * | |
272 | * Return must be: | |
273 | * 0 on success | |
274 | * -EFAULT on error reading the location | |
275 | * -EINVAL on a failed compare of the contents | |
276 | * -EPERM on error writing to the location | |
277 | * Any other value will be considered a failure. | |
278 | */ | |
279 | extern int ftrace_make_nop(struct module *mod, | |
280 | struct dyn_ftrace *rec, unsigned long addr); | |
a26a2a27 | 281 | |
593eb8a2 | 282 | /** |
31e88909 SR |
283 | * ftrace_make_call - convert a nop call site into a call to addr |
284 | * @rec: the mcount call site record | |
285 | * @addr: the address that the call site should call | |
593eb8a2 SR |
286 | * |
287 | * This is a very sensitive operation and great care needs | |
288 | * to be taken by the arch. The operation should carefully | |
289 | * read the location, check to see if what is read is indeed | |
290 | * what we expect it to be, and then on success of the compare, | |
291 | * it should write to the location. | |
292 | * | |
31e88909 SR |
293 | * The code segment at @rec->ip should be a nop |
294 | * | |
593eb8a2 SR |
295 | * Return must be: |
296 | * 0 on success | |
297 | * -EFAULT on error reading the location | |
298 | * -EINVAL on a failed compare of the contents | |
299 | * -EPERM on error writing to the location | |
300 | * Any other value will be considered a failure. | |
301 | */ | |
31e88909 SR |
302 | extern int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr); |
303 | ||
31e88909 SR |
304 | /* May be defined in arch */ |
305 | extern int ftrace_arch_read_dyn_info(char *buf, int size); | |
593eb8a2 | 306 | |
ecea656d AS |
307 | extern int skip_trace(unsigned long ip); |
308 | ||
c0719e5a SR |
309 | extern void ftrace_disable_daemon(void); |
310 | extern void ftrace_enable_daemon(void); | |
e1c08bdd | 311 | #else |
4dbf6bc2 SR |
312 | static inline int skip_trace(unsigned long ip) { return 0; } |
313 | static inline int ftrace_force_update(void) { return 0; } | |
314 | static inline void ftrace_set_filter(unsigned char *buf, int len, int reset) | |
315 | { | |
316 | } | |
317 | static inline void ftrace_disable_daemon(void) { } | |
318 | static inline void ftrace_enable_daemon(void) { } | |
e7247a15 | 319 | static inline void ftrace_release_mod(struct module *mod) {} |
f6180773 SR |
320 | static inline int register_ftrace_command(struct ftrace_func_command *cmd) |
321 | { | |
97d0bb8d | 322 | return -EINVAL; |
f6180773 SR |
323 | } |
324 | static inline int unregister_ftrace_command(char *cmd_name) | |
325 | { | |
97d0bb8d | 326 | return -EINVAL; |
f6180773 | 327 | } |
2cfa1978 MH |
328 | static inline int ftrace_text_reserved(void *start, void *end) |
329 | { | |
330 | return 0; | |
331 | } | |
fc13cb0c SR |
332 | |
333 | /* | |
334 | * Again users of functions that have ftrace_ops may not | |
335 | * have them defined when ftrace is not enabled, but these | |
336 | * functions may still be called. Use a macro instead of inline. | |
337 | */ | |
338 | #define ftrace_regex_open(ops, flag, inod, file) ({ -ENODEV; }) | |
339 | ||
340 | static inline ssize_t ftrace_filter_write(struct file *file, const char __user *ubuf, | |
341 | size_t cnt, loff_t *ppos) { return -ENODEV; } | |
342 | static inline ssize_t ftrace_notrace_write(struct file *file, const char __user *ubuf, | |
343 | size_t cnt, loff_t *ppos) { return -ENODEV; } | |
344 | static inline loff_t ftrace_regex_lseek(struct file *file, loff_t offset, int origin) | |
345 | { | |
346 | return -ENODEV; | |
347 | } | |
348 | static inline int | |
349 | ftrace_regex_release(struct inode *inode, struct file *file) { return -ENODEV; } | |
ecea656d | 350 | #endif /* CONFIG_DYNAMIC_FTRACE */ |
352ad25a | 351 | |
aeaee8a2 IM |
352 | /* totally disable ftrace - can not re-enable after this */ |
353 | void ftrace_kill(void); | |
354 | ||
f43fdad8 IM |
355 | static inline void tracer_disable(void) |
356 | { | |
606576ce | 357 | #ifdef CONFIG_FUNCTION_TRACER |
f43fdad8 IM |
358 | ftrace_enabled = 0; |
359 | #endif | |
360 | } | |
361 | ||
37002735 HY |
362 | /* |
363 | * Ftrace disable/restore without lock. Some synchronization mechanism | |
9bdeb7b5 | 364 | * must be used to prevent ftrace_enabled to be changed between |
37002735 HY |
365 | * disable/restore. |
366 | */ | |
9bdeb7b5 HY |
367 | static inline int __ftrace_enabled_save(void) |
368 | { | |
606576ce | 369 | #ifdef CONFIG_FUNCTION_TRACER |
9bdeb7b5 HY |
370 | int saved_ftrace_enabled = ftrace_enabled; |
371 | ftrace_enabled = 0; | |
372 | return saved_ftrace_enabled; | |
373 | #else | |
374 | return 0; | |
375 | #endif | |
376 | } | |
377 | ||
378 | static inline void __ftrace_enabled_restore(int enabled) | |
379 | { | |
606576ce | 380 | #ifdef CONFIG_FUNCTION_TRACER |
9bdeb7b5 HY |
381 | ftrace_enabled = enabled; |
382 | #endif | |
383 | } | |
384 | ||
c79a61f5 UKK |
385 | #ifndef HAVE_ARCH_CALLER_ADDR |
386 | # ifdef CONFIG_FRAME_POINTER | |
387 | # define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0)) | |
388 | # define CALLER_ADDR1 ((unsigned long)__builtin_return_address(1)) | |
389 | # define CALLER_ADDR2 ((unsigned long)__builtin_return_address(2)) | |
390 | # define CALLER_ADDR3 ((unsigned long)__builtin_return_address(3)) | |
391 | # define CALLER_ADDR4 ((unsigned long)__builtin_return_address(4)) | |
392 | # define CALLER_ADDR5 ((unsigned long)__builtin_return_address(5)) | |
393 | # define CALLER_ADDR6 ((unsigned long)__builtin_return_address(6)) | |
394 | # else | |
395 | # define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0)) | |
396 | # define CALLER_ADDR1 0UL | |
397 | # define CALLER_ADDR2 0UL | |
398 | # define CALLER_ADDR3 0UL | |
399 | # define CALLER_ADDR4 0UL | |
400 | # define CALLER_ADDR5 0UL | |
401 | # define CALLER_ADDR6 0UL | |
402 | # endif | |
403 | #endif /* ifndef HAVE_ARCH_CALLER_ADDR */ | |
352ad25a | 404 | |
81d68a96 | 405 | #ifdef CONFIG_IRQSOFF_TRACER |
489f1396 IM |
406 | extern void time_hardirqs_on(unsigned long a0, unsigned long a1); |
407 | extern void time_hardirqs_off(unsigned long a0, unsigned long a1); | |
81d68a96 | 408 | #else |
4dbf6bc2 SR |
409 | static inline void time_hardirqs_on(unsigned long a0, unsigned long a1) { } |
410 | static inline void time_hardirqs_off(unsigned long a0, unsigned long a1) { } | |
81d68a96 SR |
411 | #endif |
412 | ||
6cd8a4bb | 413 | #ifdef CONFIG_PREEMPT_TRACER |
489f1396 IM |
414 | extern void trace_preempt_on(unsigned long a0, unsigned long a1); |
415 | extern void trace_preempt_off(unsigned long a0, unsigned long a1); | |
6cd8a4bb | 416 | #else |
4dbf6bc2 SR |
417 | static inline void trace_preempt_on(unsigned long a0, unsigned long a1) { } |
418 | static inline void trace_preempt_off(unsigned long a0, unsigned long a1) { } | |
6cd8a4bb SR |
419 | #endif |
420 | ||
68bf21aa SR |
421 | #ifdef CONFIG_FTRACE_MCOUNT_RECORD |
422 | extern void ftrace_init(void); | |
423 | #else | |
424 | static inline void ftrace_init(void) { } | |
425 | #endif | |
426 | ||
287b6e68 FW |
427 | /* |
428 | * Structure that defines an entry function trace. | |
429 | */ | |
430 | struct ftrace_graph_ent { | |
431 | unsigned long func; /* Current function */ | |
432 | int depth; | |
433 | }; | |
dd0e545f | 434 | |
caf4b323 FW |
435 | /* |
436 | * Structure that defines a return function trace. | |
437 | */ | |
fb52607a | 438 | struct ftrace_graph_ret { |
caf4b323 FW |
439 | unsigned long func; /* Current function */ |
440 | unsigned long long calltime; | |
441 | unsigned long long rettime; | |
0231022c FW |
442 | /* Number of functions that overran the depth limit for current task */ |
443 | unsigned long overrun; | |
287b6e68 | 444 | int depth; |
caf4b323 FW |
445 | }; |
446 | ||
62b915f1 JO |
447 | /* Type of the callback handlers for tracing function graph*/ |
448 | typedef void (*trace_func_graph_ret_t)(struct ftrace_graph_ret *); /* return */ | |
449 | typedef int (*trace_func_graph_ent_t)(struct ftrace_graph_ent *); /* entry */ | |
450 | ||
fb52607a | 451 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
8b96f011 | 452 | |
5ac9f622 | 453 | /* for init task */ |
f876d346 | 454 | #define INIT_FTRACE_GRAPH .ret_stack = NULL, |
5ac9f622 | 455 | |
712406a6 SR |
456 | /* |
457 | * Stack of return addresses for functions | |
458 | * of a thread. | |
459 | * Used in struct thread_info | |
460 | */ | |
461 | struct ftrace_ret_stack { | |
462 | unsigned long ret; | |
463 | unsigned long func; | |
464 | unsigned long long calltime; | |
a2a16d6a | 465 | unsigned long long subtime; |
71e308a2 | 466 | unsigned long fp; |
712406a6 SR |
467 | }; |
468 | ||
469 | /* | |
470 | * Primary handler of a function return. | |
471 | * It relays on ftrace_return_to_handler. | |
472 | * Defined in entry_32/64.S | |
473 | */ | |
474 | extern void return_to_handler(void); | |
475 | ||
476 | extern int | |
71e308a2 SR |
477 | ftrace_push_return_trace(unsigned long ret, unsigned long func, int *depth, |
478 | unsigned long frame_pointer); | |
712406a6 | 479 | |
8b96f011 FW |
480 | /* |
481 | * Sometimes we don't want to trace a function with the function | |
482 | * graph tracer but we want them to keep traced by the usual function | |
483 | * tracer if the function graph tracer is not configured. | |
484 | */ | |
485 | #define __notrace_funcgraph notrace | |
486 | ||
bcbc4f20 FW |
487 | /* |
488 | * We want to which function is an entrypoint of a hardirq. | |
489 | * That will help us to put a signal on output. | |
490 | */ | |
491 | #define __irq_entry __attribute__((__section__(".irqentry.text"))) | |
492 | ||
493 | /* Limits of hardirq entrypoints */ | |
494 | extern char __irqentry_text_start[]; | |
495 | extern char __irqentry_text_end[]; | |
496 | ||
f201ae23 FW |
497 | #define FTRACE_RETFUNC_DEPTH 50 |
498 | #define FTRACE_RETSTACK_ALLOC_SIZE 32 | |
287b6e68 FW |
499 | extern int register_ftrace_graph(trace_func_graph_ret_t retfunc, |
500 | trace_func_graph_ent_t entryfunc); | |
501 | ||
14a866c5 SR |
502 | extern void ftrace_graph_stop(void); |
503 | ||
287b6e68 FW |
504 | /* The current handlers in use */ |
505 | extern trace_func_graph_ret_t ftrace_graph_return; | |
506 | extern trace_func_graph_ent_t ftrace_graph_entry; | |
caf4b323 | 507 | |
fb52607a | 508 | extern void unregister_ftrace_graph(void); |
f201ae23 | 509 | |
fb52607a FW |
510 | extern void ftrace_graph_init_task(struct task_struct *t); |
511 | extern void ftrace_graph_exit_task(struct task_struct *t); | |
868baf07 | 512 | extern void ftrace_graph_init_idle_task(struct task_struct *t, int cpu); |
21a8c466 FW |
513 | |
514 | static inline int task_curr_ret_stack(struct task_struct *t) | |
515 | { | |
516 | return t->curr_ret_stack; | |
517 | } | |
380c4b14 FW |
518 | |
519 | static inline void pause_graph_tracing(void) | |
520 | { | |
521 | atomic_inc(¤t->tracing_graph_pause); | |
522 | } | |
523 | ||
524 | static inline void unpause_graph_tracing(void) | |
525 | { | |
526 | atomic_dec(¤t->tracing_graph_pause); | |
527 | } | |
5ac9f622 | 528 | #else /* !CONFIG_FUNCTION_GRAPH_TRACER */ |
8b96f011 FW |
529 | |
530 | #define __notrace_funcgraph | |
bcbc4f20 | 531 | #define __irq_entry |
5ac9f622 | 532 | #define INIT_FTRACE_GRAPH |
8b96f011 | 533 | |
fb52607a FW |
534 | static inline void ftrace_graph_init_task(struct task_struct *t) { } |
535 | static inline void ftrace_graph_exit_task(struct task_struct *t) { } | |
868baf07 | 536 | static inline void ftrace_graph_init_idle_task(struct task_struct *t, int cpu) { } |
21a8c466 | 537 | |
62b915f1 JO |
538 | static inline int register_ftrace_graph(trace_func_graph_ret_t retfunc, |
539 | trace_func_graph_ent_t entryfunc) | |
540 | { | |
541 | return -1; | |
542 | } | |
543 | static inline void unregister_ftrace_graph(void) { } | |
544 | ||
21a8c466 FW |
545 | static inline int task_curr_ret_stack(struct task_struct *tsk) |
546 | { | |
547 | return -1; | |
548 | } | |
380c4b14 FW |
549 | |
550 | static inline void pause_graph_tracing(void) { } | |
551 | static inline void unpause_graph_tracing(void) { } | |
5ac9f622 | 552 | #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ |
caf4b323 | 553 | |
ea4e2bc4 | 554 | #ifdef CONFIG_TRACING |
ea4e2bc4 SR |
555 | |
556 | /* flags for current->trace */ | |
557 | enum { | |
558 | TSK_TRACE_FL_TRACE_BIT = 0, | |
559 | TSK_TRACE_FL_GRAPH_BIT = 1, | |
560 | }; | |
561 | enum { | |
562 | TSK_TRACE_FL_TRACE = 1 << TSK_TRACE_FL_TRACE_BIT, | |
563 | TSK_TRACE_FL_GRAPH = 1 << TSK_TRACE_FL_GRAPH_BIT, | |
564 | }; | |
565 | ||
566 | static inline void set_tsk_trace_trace(struct task_struct *tsk) | |
567 | { | |
568 | set_bit(TSK_TRACE_FL_TRACE_BIT, &tsk->trace); | |
569 | } | |
570 | ||
571 | static inline void clear_tsk_trace_trace(struct task_struct *tsk) | |
572 | { | |
573 | clear_bit(TSK_TRACE_FL_TRACE_BIT, &tsk->trace); | |
574 | } | |
575 | ||
576 | static inline int test_tsk_trace_trace(struct task_struct *tsk) | |
577 | { | |
578 | return tsk->trace & TSK_TRACE_FL_TRACE; | |
579 | } | |
580 | ||
581 | static inline void set_tsk_trace_graph(struct task_struct *tsk) | |
582 | { | |
583 | set_bit(TSK_TRACE_FL_GRAPH_BIT, &tsk->trace); | |
584 | } | |
585 | ||
586 | static inline void clear_tsk_trace_graph(struct task_struct *tsk) | |
587 | { | |
588 | clear_bit(TSK_TRACE_FL_GRAPH_BIT, &tsk->trace); | |
589 | } | |
590 | ||
591 | static inline int test_tsk_trace_graph(struct task_struct *tsk) | |
592 | { | |
593 | return tsk->trace & TSK_TRACE_FL_GRAPH; | |
594 | } | |
595 | ||
cecbca96 FW |
596 | enum ftrace_dump_mode; |
597 | ||
598 | extern enum ftrace_dump_mode ftrace_dump_on_oops; | |
526211bc | 599 | |
261842b7 SR |
600 | #ifdef CONFIG_PREEMPT |
601 | #define INIT_TRACE_RECURSION .trace_recursion = 0, | |
602 | #endif | |
603 | ||
ea4e2bc4 SR |
604 | #endif /* CONFIG_TRACING */ |
605 | ||
261842b7 SR |
606 | #ifndef INIT_TRACE_RECURSION |
607 | #define INIT_TRACE_RECURSION | |
608 | #endif | |
b1818748 | 609 | |
e7b8e675 MF |
610 | #ifdef CONFIG_FTRACE_SYSCALLS |
611 | ||
612 | unsigned long arch_syscall_addr(int nr); | |
613 | ||
614 | #endif /* CONFIG_FTRACE_SYSCALLS */ | |
615 | ||
16444a8a | 616 | #endif /* _LINUX_FTRACE_H */ |