Commit | Line | Data |
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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
9849ed4d MF |
2 | /* |
3 | * Ftrace header. For implementation details beyond the random comments | |
5fb94e9c | 4 | * scattered below, see: Documentation/trace/ftrace-design.rst |
9849ed4d MF |
5 | */ |
6 | ||
16444a8a ACM |
7 | #ifndef _LINUX_FTRACE_H |
8 | #define _LINUX_FTRACE_H | |
9 | ||
0012693a | 10 | #include <linux/trace_clock.h> |
5601020f | 11 | #include <linux/kallsyms.h> |
0012693a | 12 | #include <linux/linkage.h> |
ea4e2bc4 | 13 | #include <linux/bitops.h> |
a1e2e31d | 14 | #include <linux/ptrace.h> |
0012693a | 15 | #include <linux/ktime.h> |
21a8c466 | 16 | #include <linux/sched.h> |
0012693a FW |
17 | #include <linux/types.h> |
18 | #include <linux/init.h> | |
19 | #include <linux/fs.h> | |
16444a8a | 20 | |
c79a61f5 UKK |
21 | #include <asm/ftrace.h> |
22 | ||
2f5f6ad9 SR |
23 | /* |
24 | * If the arch supports passing the variable contents of | |
25 | * function_trace_op as the third parameter back from the | |
26 | * mcount call, then the arch should define this as 1. | |
27 | */ | |
28 | #ifndef ARCH_SUPPORTS_FTRACE_OPS | |
29 | #define ARCH_SUPPORTS_FTRACE_OPS 0 | |
30 | #endif | |
31 | ||
ccf3672d SR |
32 | /* |
33 | * If the arch's mcount caller does not support all of ftrace's | |
34 | * features, then it must call an indirect function that | |
35 | * does. Or at least does enough to prevent any unwelcomed side effects. | |
36 | */ | |
7544256a | 37 | #if !ARCH_SUPPORTS_FTRACE_OPS |
ccf3672d SR |
38 | # define FTRACE_FORCE_LIST_FUNC 1 |
39 | #else | |
40 | # define FTRACE_FORCE_LIST_FUNC 0 | |
41 | #endif | |
42 | ||
5f893b26 SRRH |
43 | /* Main tracing buffer and events set up */ |
44 | #ifdef CONFIG_TRACING | |
45 | void trace_init(void); | |
e725c731 | 46 | void early_trace_init(void); |
5f893b26 SRRH |
47 | #else |
48 | static inline void trace_init(void) { } | |
e725c731 | 49 | static inline void early_trace_init(void) { } |
5f893b26 | 50 | #endif |
ccf3672d | 51 | |
de477254 | 52 | struct module; |
04da85b8 | 53 | struct ftrace_hash; |
013bf0da | 54 | struct ftrace_direct_func; |
04da85b8 | 55 | |
aba4b5c2 SRV |
56 | #if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_MODULES) && \ |
57 | defined(CONFIG_DYNAMIC_FTRACE) | |
58 | const char * | |
59 | ftrace_mod_address_lookup(unsigned long addr, unsigned long *size, | |
60 | unsigned long *off, char **modname, char *sym); | |
6171a031 SRV |
61 | int ftrace_mod_get_kallsym(unsigned int symnum, unsigned long *value, |
62 | char *type, char *name, | |
63 | char *module_name, int *exported); | |
aba4b5c2 SRV |
64 | #else |
65 | static inline const char * | |
66 | ftrace_mod_address_lookup(unsigned long addr, unsigned long *size, | |
67 | unsigned long *off, char **modname, char *sym) | |
68 | { | |
69 | return NULL; | |
70 | } | |
6171a031 SRV |
71 | static inline int ftrace_mod_get_kallsym(unsigned int symnum, unsigned long *value, |
72 | char *type, char *name, | |
73 | char *module_name, int *exported) | |
74 | { | |
75 | return -1; | |
76 | } | |
aba4b5c2 SRV |
77 | #endif |
78 | ||
79 | ||
606576ce | 80 | #ifdef CONFIG_FUNCTION_TRACER |
3e1932ad | 81 | |
b0fc494f SR |
82 | extern int ftrace_enabled; |
83 | extern int | |
84 | ftrace_enable_sysctl(struct ctl_table *table, int write, | |
8d65af78 | 85 | void __user *buffer, size_t *lenp, |
b0fc494f SR |
86 | loff_t *ppos); |
87 | ||
2f5f6ad9 SR |
88 | struct ftrace_ops; |
89 | ||
90 | typedef void (*ftrace_func_t)(unsigned long ip, unsigned long parent_ip, | |
a1e2e31d | 91 | struct ftrace_ops *op, struct pt_regs *regs); |
16444a8a | 92 | |
87354059 SRRH |
93 | ftrace_func_t ftrace_ops_get_func(struct ftrace_ops *ops); |
94 | ||
e248491a JO |
95 | /* |
96 | * FTRACE_OPS_FL_* bits denote the state of ftrace_ops struct and are | |
97 | * set in the flags member. | |
f8b8be8a MH |
98 | * CONTROL, SAVE_REGS, SAVE_REGS_IF_SUPPORTED, RECURSION_SAFE, STUB and |
99 | * IPMODIFY are a kind of attribute flags which can be set only before | |
100 | * registering the ftrace_ops, and can not be modified while registered. | |
ad61dd30 | 101 | * Changing those attribute flags after registering ftrace_ops will |
f8b8be8a | 102 | * cause unexpected results. |
e248491a JO |
103 | * |
104 | * ENABLED - set/unset when ftrace_ops is registered/unregistered | |
e248491a JO |
105 | * DYNAMIC - set when ftrace_ops is registered to denote dynamically |
106 | * allocated ftrace_ops which need special care | |
08f6fba5 SR |
107 | * SAVE_REGS - The ftrace_ops wants regs saved at each function called |
108 | * and passed to the callback. If this flag is set, but the | |
109 | * architecture does not support passing regs | |
06aeaaea | 110 | * (CONFIG_DYNAMIC_FTRACE_WITH_REGS is not defined), then the |
08f6fba5 SR |
111 | * ftrace_ops will fail to register, unless the next flag |
112 | * is set. | |
113 | * SAVE_REGS_IF_SUPPORTED - This is the same as SAVE_REGS, but if the | |
114 | * handler can handle an arch that does not save regs | |
115 | * (the handler tests if regs == NULL), then it can set | |
116 | * this flag instead. It will not fail registering the ftrace_ops | |
117 | * but, the regs field will be NULL if the arch does not support | |
118 | * passing regs to the handler. | |
119 | * Note, if this flag is set, the SAVE_REGS flag will automatically | |
120 | * get set upon registering the ftrace_ops, if the arch supports it. | |
4740974a SR |
121 | * RECURSION_SAFE - The ftrace_ops can set this to tell the ftrace infrastructure |
122 | * that the call back has its own recursion protection. If it does | |
123 | * not set this, then the ftrace infrastructure will add recursion | |
124 | * protection for the caller. | |
395b97a3 | 125 | * STUB - The ftrace_ops is just a place holder. |
f04f24fb MH |
126 | * INITIALIZED - The ftrace_ops has already been initialized (first use time |
127 | * register_ftrace_function() is called, it will initialized the ops) | |
591dffda | 128 | * DELETED - The ops are being deleted, do not let them be registered again. |
e1effa01 SRRH |
129 | * ADDING - The ops is in the process of being added. |
130 | * REMOVING - The ops is in the process of being removed. | |
131 | * MODIFYING - The ops is in the process of changing its filter functions. | |
f3bea491 SRRH |
132 | * ALLOC_TRAMP - A dynamic trampoline was allocated by the core code. |
133 | * The arch specific code sets this flag when it allocated a | |
134 | * trampoline. This lets the arch know that it can update the | |
135 | * trampoline in case the callback function changes. | |
136 | * The ftrace_ops trampoline can be set by the ftrace users, and | |
137 | * in such cases the arch must not modify it. Only the arch ftrace | |
138 | * core code should set this flag. | |
f8b8be8a MH |
139 | * IPMODIFY - The ops can modify the IP register. This can only be set with |
140 | * SAVE_REGS. If another ops with this flag set is already registered | |
141 | * for any of the functions that this ops will be registered for, then | |
142 | * this ops will fail to register or set_filter_ip. | |
e3eea140 | 143 | * PID - Is affected by set_ftrace_pid (allows filtering on those pids) |
d0ba52f1 | 144 | * RCU - Set when the ops can only be called when RCU is watching. |
8c08f0d5 | 145 | * TRACE_ARRAY - The ops->private points to a trace_array descriptor. |
7162431d MB |
146 | * PERMANENT - Set when the ops is permanent and should not be affected by |
147 | * ftrace_enabled. | |
763e34e7 SRV |
148 | * DIRECT - Used by the direct ftrace_ops helper for direct functions |
149 | * (internal ftrace only, should not be used by others) | |
e248491a | 150 | */ |
b848914c | 151 | enum { |
b41db132 EWI |
152 | FTRACE_OPS_FL_ENABLED = BIT(0), |
153 | FTRACE_OPS_FL_DYNAMIC = BIT(1), | |
154 | FTRACE_OPS_FL_SAVE_REGS = BIT(2), | |
155 | FTRACE_OPS_FL_SAVE_REGS_IF_SUPPORTED = BIT(3), | |
156 | FTRACE_OPS_FL_RECURSION_SAFE = BIT(4), | |
157 | FTRACE_OPS_FL_STUB = BIT(5), | |
158 | FTRACE_OPS_FL_INITIALIZED = BIT(6), | |
159 | FTRACE_OPS_FL_DELETED = BIT(7), | |
160 | FTRACE_OPS_FL_ADDING = BIT(8), | |
161 | FTRACE_OPS_FL_REMOVING = BIT(9), | |
162 | FTRACE_OPS_FL_MODIFYING = BIT(10), | |
163 | FTRACE_OPS_FL_ALLOC_TRAMP = BIT(11), | |
164 | FTRACE_OPS_FL_IPMODIFY = BIT(12), | |
165 | FTRACE_OPS_FL_PID = BIT(13), | |
166 | FTRACE_OPS_FL_RCU = BIT(14), | |
167 | FTRACE_OPS_FL_TRACE_ARRAY = BIT(15), | |
168 | FTRACE_OPS_FL_PERMANENT = BIT(16), | |
169 | FTRACE_OPS_FL_DIRECT = BIT(17), | |
b848914c SR |
170 | }; |
171 | ||
33b7f99c SRRH |
172 | #ifdef CONFIG_DYNAMIC_FTRACE |
173 | /* The hash used to know what functions callbacks trace */ | |
174 | struct ftrace_ops_hash { | |
f86f4180 CZ |
175 | struct ftrace_hash __rcu *notrace_hash; |
176 | struct ftrace_hash __rcu *filter_hash; | |
33b7f99c SRRH |
177 | struct mutex regex_lock; |
178 | }; | |
42c269c8 | 179 | |
b80f0f6c | 180 | void ftrace_free_init_mem(void); |
aba4b5c2 | 181 | void ftrace_free_mem(struct module *mod, void *start, void *end); |
42c269c8 | 182 | #else |
b80f0f6c | 183 | static inline void ftrace_free_init_mem(void) { } |
aba4b5c2 | 184 | static inline void ftrace_free_mem(struct module *mod, void *start, void *end) { } |
33b7f99c SRRH |
185 | #endif |
186 | ||
b7e00a6c | 187 | /* |
ba27f2bc SRRH |
188 | * Note, ftrace_ops can be referenced outside of RCU protection, unless |
189 | * the RCU flag is set. If ftrace_ops is allocated and not part of kernel | |
190 | * core data, the unregistering of it will perform a scheduling on all CPUs | |
191 | * to make sure that there are no more users. Depending on the load of the | |
192 | * system that may take a bit of time. | |
b7e00a6c SRRH |
193 | * |
194 | * Any private data added must also take care not to be freed and if private | |
195 | * data is added to a ftrace_ops that is in core code, the user of the | |
196 | * ftrace_ops must perform a schedule_on_each_cpu() before freeing it. | |
197 | */ | |
16444a8a | 198 | struct ftrace_ops { |
f45948e8 | 199 | ftrace_func_t func; |
f86f4180 | 200 | struct ftrace_ops __rcu *next; |
b848914c | 201 | unsigned long flags; |
b7e00a6c | 202 | void *private; |
e3eea140 | 203 | ftrace_func_t saved_func; |
f45948e8 | 204 | #ifdef CONFIG_DYNAMIC_FTRACE |
33b7f99c SRRH |
205 | struct ftrace_ops_hash local_hash; |
206 | struct ftrace_ops_hash *func_hash; | |
fef5aeee | 207 | struct ftrace_ops_hash old_hash; |
79922b80 | 208 | unsigned long trampoline; |
aec0be2d | 209 | unsigned long trampoline_size; |
f45948e8 | 210 | #endif |
16444a8a ACM |
211 | }; |
212 | ||
e7d3737e FW |
213 | /* |
214 | * Type of the current tracing. | |
215 | */ | |
216 | enum ftrace_tracing_type_t { | |
217 | FTRACE_TYPE_ENTER = 0, /* Hook the call of the function */ | |
218 | FTRACE_TYPE_RETURN, /* Hook the return of the function */ | |
219 | }; | |
220 | ||
221 | /* Current tracing type, default is FTRACE_TYPE_ENTER */ | |
222 | extern enum ftrace_tracing_type_t ftrace_tracing_type; | |
223 | ||
16444a8a ACM |
224 | /* |
225 | * The ftrace_ops must be a static and should also | |
226 | * be read_mostly. These functions do modify read_mostly variables | |
227 | * so use them sparely. Never free an ftrace_op or modify the | |
228 | * next pointer after it has been registered. Even after unregistering | |
229 | * it, the next pointer may still be used internally. | |
230 | */ | |
231 | int register_ftrace_function(struct ftrace_ops *ops); | |
232 | int unregister_ftrace_function(struct ftrace_ops *ops); | |
16444a8a | 233 | |
a1e2e31d SR |
234 | extern void ftrace_stub(unsigned long a0, unsigned long a1, |
235 | struct ftrace_ops *op, struct pt_regs *regs); | |
16444a8a | 236 | |
606576ce | 237 | #else /* !CONFIG_FUNCTION_TRACER */ |
4dbf6bc2 SR |
238 | /* |
239 | * (un)register_ftrace_function must be a macro since the ops parameter | |
240 | * must not be evaluated. | |
241 | */ | |
242 | #define register_ftrace_function(ops) ({ 0; }) | |
243 | #define unregister_ftrace_function(ops) ({ 0; }) | |
81adbdc0 | 244 | static inline void ftrace_kill(void) { } |
b80f0f6c | 245 | static inline void ftrace_free_init_mem(void) { } |
aba4b5c2 | 246 | static inline void ftrace_free_mem(struct module *mod, void *start, void *end) { } |
606576ce | 247 | #endif /* CONFIG_FUNCTION_TRACER */ |
352ad25a | 248 | |
ea806eb3 SRV |
249 | struct ftrace_func_entry { |
250 | struct hlist_node hlist; | |
251 | unsigned long ip; | |
252 | unsigned long direct; /* for direct lookup only */ | |
253 | }; | |
254 | ||
255 | struct dyn_ftrace; | |
256 | ||
763e34e7 | 257 | #ifdef CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS |
a3ad1a7e | 258 | extern int ftrace_direct_func_count; |
763e34e7 SRV |
259 | int register_ftrace_direct(unsigned long ip, unsigned long addr); |
260 | int unregister_ftrace_direct(unsigned long ip, unsigned long addr); | |
0567d680 | 261 | int modify_ftrace_direct(unsigned long ip, unsigned long old_addr, unsigned long new_addr); |
013bf0da | 262 | struct ftrace_direct_func *ftrace_find_direct_func(unsigned long addr); |
ea806eb3 SRV |
263 | int ftrace_modify_direct_caller(struct ftrace_func_entry *entry, |
264 | struct dyn_ftrace *rec, | |
265 | unsigned long old_addr, | |
266 | unsigned long new_addr); | |
763e34e7 | 267 | #else |
a3ad1a7e | 268 | # define ftrace_direct_func_count 0 |
763e34e7 SRV |
269 | static inline int register_ftrace_direct(unsigned long ip, unsigned long addr) |
270 | { | |
eb01fedc | 271 | return -ENOTSUPP; |
763e34e7 SRV |
272 | } |
273 | static inline int unregister_ftrace_direct(unsigned long ip, unsigned long addr) | |
274 | { | |
eb01fedc | 275 | return -ENOTSUPP; |
763e34e7 | 276 | } |
0567d680 SRV |
277 | static inline int modify_ftrace_direct(unsigned long ip, |
278 | unsigned long old_addr, unsigned long new_addr) | |
279 | { | |
eb01fedc | 280 | return -ENOTSUPP; |
0567d680 | 281 | } |
013bf0da SRV |
282 | static inline struct ftrace_direct_func *ftrace_find_direct_func(unsigned long addr) |
283 | { | |
284 | return NULL; | |
285 | } | |
ea806eb3 SRV |
286 | static inline int ftrace_modify_direct_caller(struct ftrace_func_entry *entry, |
287 | struct dyn_ftrace *rec, | |
288 | unsigned long old_addr, | |
289 | unsigned long new_addr) | |
290 | { | |
291 | return -ENODEV; | |
292 | } | |
763e34e7 SRV |
293 | #endif /* CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS */ |
294 | ||
295 | #ifndef CONFIG_HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS | |
296 | /* | |
297 | * This must be implemented by the architecture. | |
298 | * It is the way the ftrace direct_ops helper, when called | |
299 | * via ftrace (because there's other callbacks besides the | |
300 | * direct call), can inform the architecture's trampoline that this | |
301 | * routine has a direct caller, and what the caller is. | |
562955fe SRV |
302 | * |
303 | * For example, in x86, it returns the direct caller | |
304 | * callback function via the regs->orig_ax parameter. | |
305 | * Then in the ftrace trampoline, if this is set, it makes | |
306 | * the return from the trampoline jump to the direct caller | |
307 | * instead of going back to the function it just traced. | |
763e34e7 SRV |
308 | */ |
309 | static inline void arch_ftrace_set_direct_caller(struct pt_regs *regs, | |
310 | unsigned long addr) { } | |
311 | #endif /* CONFIG_HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS */ | |
312 | ||
f38f1d2a | 313 | #ifdef CONFIG_STACK_TRACER |
bb99d8cc | 314 | |
f38f1d2a | 315 | extern int stack_tracer_enabled; |
3d9a8072 TG |
316 | |
317 | int stack_trace_sysctl(struct ctl_table *table, int write, | |
318 | void __user *buffer, size_t *lenp, | |
319 | loff_t *ppos); | |
5367278c | 320 | |
8aaf1ee7 SRV |
321 | /* DO NOT MODIFY THIS VARIABLE DIRECTLY! */ |
322 | DECLARE_PER_CPU(int, disable_stack_tracer); | |
323 | ||
324 | /** | |
325 | * stack_tracer_disable - temporarily disable the stack tracer | |
326 | * | |
327 | * There's a few locations (namely in RCU) where stack tracing | |
328 | * cannot be executed. This function is used to disable stack | |
329 | * tracing during those critical sections. | |
330 | * | |
331 | * This function must be called with preemption or interrupts | |
332 | * disabled and stack_tracer_enable() must be called shortly after | |
333 | * while preemption or interrupts are still disabled. | |
334 | */ | |
335 | static inline void stack_tracer_disable(void) | |
336 | { | |
337 | /* Preemption or interupts must be disabled */ | |
60361e12 | 338 | if (IS_ENABLED(CONFIG_DEBUG_PREEMPT)) |
8aaf1ee7 SRV |
339 | WARN_ON_ONCE(!preempt_count() || !irqs_disabled()); |
340 | this_cpu_inc(disable_stack_tracer); | |
341 | } | |
342 | ||
343 | /** | |
344 | * stack_tracer_enable - re-enable the stack tracer | |
345 | * | |
346 | * After stack_tracer_disable() is called, stack_tracer_enable() | |
347 | * must be called shortly afterward. | |
348 | */ | |
349 | static inline void stack_tracer_enable(void) | |
350 | { | |
60361e12 | 351 | if (IS_ENABLED(CONFIG_DEBUG_PREEMPT)) |
8aaf1ee7 SRV |
352 | WARN_ON_ONCE(!preempt_count() || !irqs_disabled()); |
353 | this_cpu_dec(disable_stack_tracer); | |
354 | } | |
5367278c SRV |
355 | #else |
356 | static inline void stack_tracer_disable(void) { } | |
357 | static inline void stack_tracer_enable(void) { } | |
f38f1d2a SR |
358 | #endif |
359 | ||
3d083395 | 360 | #ifdef CONFIG_DYNAMIC_FTRACE |
31e88909 | 361 | |
000ab691 SR |
362 | int ftrace_arch_code_modify_prepare(void); |
363 | int ftrace_arch_code_modify_post_process(void); | |
364 | ||
02a392a0 SRRH |
365 | enum ftrace_bug_type { |
366 | FTRACE_BUG_UNKNOWN, | |
367 | FTRACE_BUG_INIT, | |
368 | FTRACE_BUG_NOP, | |
369 | FTRACE_BUG_CALL, | |
370 | FTRACE_BUG_UPDATE, | |
371 | }; | |
372 | extern enum ftrace_bug_type ftrace_bug_type; | |
373 | ||
b05086c7 SRRH |
374 | /* |
375 | * Archs can set this to point to a variable that holds the value that was | |
376 | * expected at the call site before calling ftrace_bug(). | |
377 | */ | |
378 | extern const void *ftrace_expected; | |
379 | ||
4fd3279b | 380 | void ftrace_bug(int err, struct dyn_ftrace *rec); |
c88fd863 | 381 | |
809dcf29 SR |
382 | struct seq_file; |
383 | ||
d88471cb | 384 | extern int ftrace_text_reserved(const void *start, const void *end); |
2cfa1978 | 385 | |
6be7fa3c SRV |
386 | struct ftrace_ops *ftrace_ops_trampoline(unsigned long addr); |
387 | ||
aec0be2d SRRH |
388 | bool is_ftrace_trampoline(unsigned long addr); |
389 | ||
08f6fba5 SR |
390 | /* |
391 | * The dyn_ftrace record's flags field is split into two parts. | |
392 | * the first part which is '0-FTRACE_REF_MAX' is a counter of | |
393 | * the number of callbacks that have registered the function that | |
394 | * the dyn_ftrace descriptor represents. | |
395 | * | |
396 | * The second part is a mask: | |
397 | * ENABLED - the function is being traced | |
398 | * REGS - the record wants the function to save regs | |
399 | * REGS_EN - the function is set up to save regs. | |
f8b8be8a | 400 | * IPMODIFY - the record allows for the IP address to be changed. |
b7ffffbb | 401 | * DISABLED - the record is not ready to be touched yet |
763e34e7 | 402 | * DIRECT - there is a direct function to call |
08f6fba5 SR |
403 | * |
404 | * When a new ftrace_ops is registered and wants a function to save | |
405 | * pt_regs, the rec->flag REGS is set. When the function has been | |
406 | * set up to save regs, the REG_EN flag is set. Once a function | |
407 | * starts saving regs it will do so until all ftrace_ops are removed | |
408 | * from tracing that function. | |
409 | */ | |
3c1720f0 | 410 | enum { |
79922b80 | 411 | FTRACE_FL_ENABLED = (1UL << 31), |
08f6fba5 | 412 | FTRACE_FL_REGS = (1UL << 30), |
79922b80 SRRH |
413 | FTRACE_FL_REGS_EN = (1UL << 29), |
414 | FTRACE_FL_TRAMP = (1UL << 28), | |
415 | FTRACE_FL_TRAMP_EN = (1UL << 27), | |
f8b8be8a | 416 | FTRACE_FL_IPMODIFY = (1UL << 26), |
b7ffffbb | 417 | FTRACE_FL_DISABLED = (1UL << 25), |
763e34e7 SRV |
418 | FTRACE_FL_DIRECT = (1UL << 24), |
419 | FTRACE_FL_DIRECT_EN = (1UL << 23), | |
3c1720f0 SR |
420 | }; |
421 | ||
763e34e7 SRV |
422 | #define FTRACE_REF_MAX_SHIFT 23 |
423 | #define FTRACE_FL_BITS 9 | |
cf2cb0b2 SRRH |
424 | #define FTRACE_FL_MASKED_BITS ((1UL << FTRACE_FL_BITS) - 1) |
425 | #define FTRACE_FL_MASK (FTRACE_FL_MASKED_BITS << FTRACE_REF_MAX_SHIFT) | |
426 | #define FTRACE_REF_MAX ((1UL << FTRACE_REF_MAX_SHIFT) - 1) | |
ed926f9b | 427 | |
0376bde1 SRRH |
428 | #define ftrace_rec_count(rec) ((rec)->flags & ~FTRACE_FL_MASK) |
429 | ||
3d083395 | 430 | struct dyn_ftrace { |
a762782d | 431 | unsigned long ip; /* address of mcount call-site */ |
85ae32ae | 432 | unsigned long flags; |
a762782d | 433 | struct dyn_arch_ftrace arch; |
3d083395 SR |
434 | }; |
435 | ||
e1c08bdd | 436 | int ftrace_force_update(void); |
647664ea MH |
437 | int ftrace_set_filter_ip(struct ftrace_ops *ops, unsigned long ip, |
438 | int remove, int reset); | |
ac483c44 | 439 | int ftrace_set_filter(struct ftrace_ops *ops, unsigned char *buf, |
936e074b | 440 | int len, int reset); |
ac483c44 | 441 | int ftrace_set_notrace(struct ftrace_ops *ops, unsigned char *buf, |
936e074b SR |
442 | int len, int reset); |
443 | void ftrace_set_global_filter(unsigned char *buf, int len, int reset); | |
444 | void ftrace_set_global_notrace(unsigned char *buf, int len, int reset); | |
5500fa51 | 445 | void ftrace_free_filter(struct ftrace_ops *ops); |
d032ae89 | 446 | void ftrace_ops_set_global_filter(struct ftrace_ops *ops); |
e1c08bdd | 447 | |
c88fd863 SR |
448 | enum { |
449 | FTRACE_UPDATE_CALLS = (1 << 0), | |
450 | FTRACE_DISABLE_CALLS = (1 << 1), | |
451 | FTRACE_UPDATE_TRACE_FUNC = (1 << 2), | |
452 | FTRACE_START_FUNC_RET = (1 << 3), | |
453 | FTRACE_STOP_FUNC_RET = (1 << 4), | |
a0572f68 | 454 | FTRACE_MAY_SLEEP = (1 << 5), |
c88fd863 SR |
455 | }; |
456 | ||
08f6fba5 SR |
457 | /* |
458 | * The FTRACE_UPDATE_* enum is used to pass information back | |
459 | * from the ftrace_update_record() and ftrace_test_record() | |
460 | * functions. These are called by the code update routines | |
461 | * to find out what is to be done for a given function. | |
462 | * | |
463 | * IGNORE - The function is already what we want it to be | |
464 | * MAKE_CALL - Start tracing the function | |
465 | * MODIFY_CALL - Stop saving regs for the function | |
08f6fba5 SR |
466 | * MAKE_NOP - Stop tracing the function |
467 | */ | |
c88fd863 SR |
468 | enum { |
469 | FTRACE_UPDATE_IGNORE, | |
470 | FTRACE_UPDATE_MAKE_CALL, | |
08f6fba5 | 471 | FTRACE_UPDATE_MODIFY_CALL, |
c88fd863 SR |
472 | FTRACE_UPDATE_MAKE_NOP, |
473 | }; | |
474 | ||
fc13cb0c SR |
475 | enum { |
476 | FTRACE_ITER_FILTER = (1 << 0), | |
477 | FTRACE_ITER_NOTRACE = (1 << 1), | |
478 | FTRACE_ITER_PRINTALL = (1 << 2), | |
eee8ded1 SRV |
479 | FTRACE_ITER_DO_PROBES = (1 << 3), |
480 | FTRACE_ITER_PROBE = (1 << 4), | |
5985ea8b SRV |
481 | FTRACE_ITER_MOD = (1 << 5), |
482 | FTRACE_ITER_ENABLED = (1 << 6), | |
fc13cb0c SR |
483 | }; |
484 | ||
c88fd863 | 485 | void arch_ftrace_update_code(int command); |
89f579ce YW |
486 | void arch_ftrace_update_trampoline(struct ftrace_ops *ops); |
487 | void *arch_ftrace_trampoline_func(struct ftrace_ops *ops, struct dyn_ftrace *rec); | |
488 | void arch_ftrace_trampoline_free(struct ftrace_ops *ops); | |
c88fd863 SR |
489 | |
490 | struct ftrace_rec_iter; | |
491 | ||
492 | struct ftrace_rec_iter *ftrace_rec_iter_start(void); | |
493 | struct ftrace_rec_iter *ftrace_rec_iter_next(struct ftrace_rec_iter *iter); | |
494 | struct dyn_ftrace *ftrace_rec_iter_record(struct ftrace_rec_iter *iter); | |
495 | ||
08d636b6 SR |
496 | #define for_ftrace_rec_iter(iter) \ |
497 | for (iter = ftrace_rec_iter_start(); \ | |
498 | iter; \ | |
499 | iter = ftrace_rec_iter_next(iter)) | |
500 | ||
501 | ||
7375dca1 SRV |
502 | int ftrace_update_record(struct dyn_ftrace *rec, bool enable); |
503 | int ftrace_test_record(struct dyn_ftrace *rec, bool enable); | |
c88fd863 | 504 | void ftrace_run_stop_machine(int command); |
f0cf973a | 505 | unsigned long ftrace_location(unsigned long ip); |
04cf31a7 | 506 | unsigned long ftrace_location_range(unsigned long start, unsigned long end); |
7413af1f SRRH |
507 | unsigned long ftrace_get_addr_new(struct dyn_ftrace *rec); |
508 | unsigned long ftrace_get_addr_curr(struct dyn_ftrace *rec); | |
c88fd863 SR |
509 | |
510 | extern ftrace_func_t ftrace_trace_function; | |
511 | ||
fc13cb0c SR |
512 | int ftrace_regex_open(struct ftrace_ops *ops, int flag, |
513 | struct inode *inode, struct file *file); | |
514 | ssize_t ftrace_filter_write(struct file *file, const char __user *ubuf, | |
515 | size_t cnt, loff_t *ppos); | |
516 | ssize_t ftrace_notrace_write(struct file *file, const char __user *ubuf, | |
517 | size_t cnt, loff_t *ppos); | |
fc13cb0c SR |
518 | int ftrace_regex_release(struct inode *inode, struct file *file); |
519 | ||
2a85a37f SR |
520 | void __init |
521 | ftrace_set_early_filter(struct ftrace_ops *ops, char *buf, int enable); | |
522 | ||
3d083395 | 523 | /* defined in arch */ |
3c1720f0 | 524 | extern int ftrace_ip_converted(unsigned long ip); |
3a36cb11 | 525 | extern int ftrace_dyn_arch_init(void); |
e4f5d544 | 526 | extern void ftrace_replace_code(int enable); |
d61f82d0 SR |
527 | extern int ftrace_update_ftrace_func(ftrace_func_t func); |
528 | extern void ftrace_caller(void); | |
08f6fba5 | 529 | extern void ftrace_regs_caller(void); |
d61f82d0 | 530 | extern void ftrace_call(void); |
08f6fba5 | 531 | extern void ftrace_regs_call(void); |
d61f82d0 | 532 | extern void mcount_call(void); |
f0001207 | 533 | |
8ed3e2cf SR |
534 | void ftrace_modify_all_code(int command); |
535 | ||
f0001207 SL |
536 | #ifndef FTRACE_ADDR |
537 | #define FTRACE_ADDR ((unsigned long)ftrace_caller) | |
538 | #endif | |
08f6fba5 | 539 | |
79922b80 SRRH |
540 | #ifndef FTRACE_GRAPH_ADDR |
541 | #define FTRACE_GRAPH_ADDR ((unsigned long)ftrace_graph_caller) | |
542 | #endif | |
543 | ||
08f6fba5 | 544 | #ifndef FTRACE_REGS_ADDR |
06aeaaea | 545 | #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS |
08f6fba5 SR |
546 | # define FTRACE_REGS_ADDR ((unsigned long)ftrace_regs_caller) |
547 | #else | |
548 | # define FTRACE_REGS_ADDR FTRACE_ADDR | |
549 | #endif | |
550 | #endif | |
551 | ||
646d7043 SRRH |
552 | /* |
553 | * If an arch would like functions that are only traced | |
554 | * by the function graph tracer to jump directly to its own | |
555 | * trampoline, then they can define FTRACE_GRAPH_TRAMP_ADDR | |
556 | * to be that address to jump to. | |
557 | */ | |
558 | #ifndef FTRACE_GRAPH_TRAMP_ADDR | |
559 | #define FTRACE_GRAPH_TRAMP_ADDR ((unsigned long) 0) | |
560 | #endif | |
561 | ||
fb52607a FW |
562 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
563 | extern void ftrace_graph_caller(void); | |
5a45cfe1 SR |
564 | extern int ftrace_enable_ftrace_graph_caller(void); |
565 | extern int ftrace_disable_ftrace_graph_caller(void); | |
566 | #else | |
567 | static inline int ftrace_enable_ftrace_graph_caller(void) { return 0; } | |
568 | static inline int ftrace_disable_ftrace_graph_caller(void) { return 0; } | |
e7d3737e | 569 | #endif |
ad90c0e3 | 570 | |
31e88909 | 571 | /** |
57794a9d | 572 | * ftrace_make_nop - convert code into nop |
31e88909 SR |
573 | * @mod: module structure if called by module load initialization |
574 | * @rec: the mcount call site record | |
575 | * @addr: the address that the call site should be calling | |
576 | * | |
577 | * This is a very sensitive operation and great care needs | |
578 | * to be taken by the arch. The operation should carefully | |
579 | * read the location, check to see if what is read is indeed | |
580 | * what we expect it to be, and then on success of the compare, | |
581 | * it should write to the location. | |
582 | * | |
583 | * The code segment at @rec->ip should be a caller to @addr | |
584 | * | |
585 | * Return must be: | |
586 | * 0 on success | |
587 | * -EFAULT on error reading the location | |
588 | * -EINVAL on a failed compare of the contents | |
589 | * -EPERM on error writing to the location | |
590 | * Any other value will be considered a failure. | |
591 | */ | |
592 | extern int ftrace_make_nop(struct module *mod, | |
593 | struct dyn_ftrace *rec, unsigned long addr); | |
a26a2a27 | 594 | |
593eb8a2 | 595 | /** |
31e88909 SR |
596 | * ftrace_make_call - convert a nop call site into a call to addr |
597 | * @rec: the mcount call site record | |
598 | * @addr: the address that the call site should call | |
593eb8a2 SR |
599 | * |
600 | * This is a very sensitive operation and great care needs | |
601 | * to be taken by the arch. The operation should carefully | |
602 | * read the location, check to see if what is read is indeed | |
603 | * what we expect it to be, and then on success of the compare, | |
604 | * it should write to the location. | |
605 | * | |
31e88909 SR |
606 | * The code segment at @rec->ip should be a nop |
607 | * | |
593eb8a2 SR |
608 | * Return must be: |
609 | * 0 on success | |
610 | * -EFAULT on error reading the location | |
611 | * -EINVAL on a failed compare of the contents | |
612 | * -EPERM on error writing to the location | |
613 | * Any other value will be considered a failure. | |
614 | */ | |
31e88909 SR |
615 | extern int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr); |
616 | ||
06aeaaea | 617 | #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS |
08f6fba5 SR |
618 | /** |
619 | * ftrace_modify_call - convert from one addr to another (no nop) | |
620 | * @rec: the mcount call site record | |
621 | * @old_addr: the address expected to be currently called to | |
622 | * @addr: the address to change to | |
623 | * | |
624 | * This is a very sensitive operation and great care needs | |
625 | * to be taken by the arch. The operation should carefully | |
626 | * read the location, check to see if what is read is indeed | |
627 | * what we expect it to be, and then on success of the compare, | |
628 | * it should write to the location. | |
629 | * | |
630 | * The code segment at @rec->ip should be a caller to @old_addr | |
631 | * | |
632 | * Return must be: | |
633 | * 0 on success | |
634 | * -EFAULT on error reading the location | |
635 | * -EINVAL on a failed compare of the contents | |
636 | * -EPERM on error writing to the location | |
637 | * Any other value will be considered a failure. | |
638 | */ | |
639 | extern int ftrace_modify_call(struct dyn_ftrace *rec, unsigned long old_addr, | |
640 | unsigned long addr); | |
641 | #else | |
642 | /* Should never be called */ | |
643 | static inline int ftrace_modify_call(struct dyn_ftrace *rec, unsigned long old_addr, | |
644 | unsigned long addr) | |
645 | { | |
646 | return -EINVAL; | |
647 | } | |
648 | #endif | |
649 | ||
31e88909 SR |
650 | /* May be defined in arch */ |
651 | extern int ftrace_arch_read_dyn_info(char *buf, int size); | |
593eb8a2 | 652 | |
ecea656d | 653 | extern int skip_trace(unsigned long ip); |
a949ae56 | 654 | extern void ftrace_module_init(struct module *mod); |
7dcd182b | 655 | extern void ftrace_module_enable(struct module *mod); |
049fb9bd | 656 | extern void ftrace_release_mod(struct module *mod); |
ecea656d | 657 | |
c0719e5a SR |
658 | extern void ftrace_disable_daemon(void); |
659 | extern void ftrace_enable_daemon(void); | |
4dc93676 | 660 | #else /* CONFIG_DYNAMIC_FTRACE */ |
4dbf6bc2 SR |
661 | static inline int skip_trace(unsigned long ip) { return 0; } |
662 | static inline int ftrace_force_update(void) { return 0; } | |
4dbf6bc2 SR |
663 | static inline void ftrace_disable_daemon(void) { } |
664 | static inline void ftrace_enable_daemon(void) { } | |
7dcd182b JY |
665 | static inline void ftrace_module_init(struct module *mod) { } |
666 | static inline void ftrace_module_enable(struct module *mod) { } | |
667 | static inline void ftrace_release_mod(struct module *mod) { } | |
d88471cb | 668 | static inline int ftrace_text_reserved(const void *start, const void *end) |
2cfa1978 MH |
669 | { |
670 | return 0; | |
671 | } | |
4dc93676 SR |
672 | static inline unsigned long ftrace_location(unsigned long ip) |
673 | { | |
674 | return 0; | |
675 | } | |
fc13cb0c SR |
676 | |
677 | /* | |
678 | * Again users of functions that have ftrace_ops may not | |
679 | * have them defined when ftrace is not enabled, but these | |
680 | * functions may still be called. Use a macro instead of inline. | |
681 | */ | |
682 | #define ftrace_regex_open(ops, flag, inod, file) ({ -ENODEV; }) | |
96de37b6 | 683 | #define ftrace_set_early_filter(ops, buf, enable) do { } while (0) |
647664ea | 684 | #define ftrace_set_filter_ip(ops, ip, remove, reset) ({ -ENODEV; }) |
5500fa51 JO |
685 | #define ftrace_set_filter(ops, buf, len, reset) ({ -ENODEV; }) |
686 | #define ftrace_set_notrace(ops, buf, len, reset) ({ -ENODEV; }) | |
687 | #define ftrace_free_filter(ops) do { } while (0) | |
d032ae89 | 688 | #define ftrace_ops_set_global_filter(ops) do { } while (0) |
fc13cb0c SR |
689 | |
690 | static inline ssize_t ftrace_filter_write(struct file *file, const char __user *ubuf, | |
691 | size_t cnt, loff_t *ppos) { return -ENODEV; } | |
692 | static inline ssize_t ftrace_notrace_write(struct file *file, const char __user *ubuf, | |
693 | size_t cnt, loff_t *ppos) { return -ENODEV; } | |
fc13cb0c SR |
694 | static inline int |
695 | ftrace_regex_release(struct inode *inode, struct file *file) { return -ENODEV; } | |
aec0be2d SRRH |
696 | |
697 | static inline bool is_ftrace_trampoline(unsigned long addr) | |
698 | { | |
699 | return false; | |
700 | } | |
ecea656d | 701 | #endif /* CONFIG_DYNAMIC_FTRACE */ |
352ad25a | 702 | |
aeaee8a2 IM |
703 | /* totally disable ftrace - can not re-enable after this */ |
704 | void ftrace_kill(void); | |
705 | ||
f43fdad8 IM |
706 | static inline void tracer_disable(void) |
707 | { | |
606576ce | 708 | #ifdef CONFIG_FUNCTION_TRACER |
f43fdad8 IM |
709 | ftrace_enabled = 0; |
710 | #endif | |
711 | } | |
712 | ||
37002735 HY |
713 | /* |
714 | * Ftrace disable/restore without lock. Some synchronization mechanism | |
9bdeb7b5 | 715 | * must be used to prevent ftrace_enabled to be changed between |
37002735 HY |
716 | * disable/restore. |
717 | */ | |
9bdeb7b5 HY |
718 | static inline int __ftrace_enabled_save(void) |
719 | { | |
606576ce | 720 | #ifdef CONFIG_FUNCTION_TRACER |
9bdeb7b5 HY |
721 | int saved_ftrace_enabled = ftrace_enabled; |
722 | ftrace_enabled = 0; | |
723 | return saved_ftrace_enabled; | |
724 | #else | |
725 | return 0; | |
726 | #endif | |
727 | } | |
728 | ||
729 | static inline void __ftrace_enabled_restore(int enabled) | |
730 | { | |
606576ce | 731 | #ifdef CONFIG_FUNCTION_TRACER |
9bdeb7b5 HY |
732 | ftrace_enabled = enabled; |
733 | #endif | |
734 | } | |
735 | ||
eed542d6 AT |
736 | /* All archs should have this, but we define it for consistency */ |
737 | #ifndef ftrace_return_address0 | |
738 | # define ftrace_return_address0 __builtin_return_address(0) | |
739 | #endif | |
740 | ||
741 | /* Archs may use other ways for ADDR1 and beyond */ | |
742 | #ifndef ftrace_return_address | |
c79a61f5 | 743 | # ifdef CONFIG_FRAME_POINTER |
eed542d6 | 744 | # define ftrace_return_address(n) __builtin_return_address(n) |
c79a61f5 | 745 | # else |
eed542d6 | 746 | # define ftrace_return_address(n) 0UL |
c79a61f5 | 747 | # endif |
eed542d6 AT |
748 | #endif |
749 | ||
750 | #define CALLER_ADDR0 ((unsigned long)ftrace_return_address0) | |
751 | #define CALLER_ADDR1 ((unsigned long)ftrace_return_address(1)) | |
752 | #define CALLER_ADDR2 ((unsigned long)ftrace_return_address(2)) | |
753 | #define CALLER_ADDR3 ((unsigned long)ftrace_return_address(3)) | |
754 | #define CALLER_ADDR4 ((unsigned long)ftrace_return_address(4)) | |
755 | #define CALLER_ADDR5 ((unsigned long)ftrace_return_address(5)) | |
756 | #define CALLER_ADDR6 ((unsigned long)ftrace_return_address(6)) | |
352ad25a | 757 | |
f904f582 SAS |
758 | static inline unsigned long get_lock_parent_ip(void) |
759 | { | |
760 | unsigned long addr = CALLER_ADDR0; | |
761 | ||
762 | if (!in_lock_functions(addr)) | |
763 | return addr; | |
764 | addr = CALLER_ADDR1; | |
765 | if (!in_lock_functions(addr)) | |
766 | return addr; | |
767 | return CALLER_ADDR2; | |
768 | } | |
769 | ||
c3bc8fd6 | 770 | #ifdef CONFIG_TRACE_PREEMPT_TOGGLE |
489f1396 IM |
771 | extern void trace_preempt_on(unsigned long a0, unsigned long a1); |
772 | extern void trace_preempt_off(unsigned long a0, unsigned long a1); | |
6cd8a4bb | 773 | #else |
b02ee9a3 MB |
774 | /* |
775 | * Use defines instead of static inlines because some arches will make code out | |
776 | * of the CALLER_ADDR, when we really want these to be a real nop. | |
777 | */ | |
778 | # define trace_preempt_on(a0, a1) do { } while (0) | |
779 | # define trace_preempt_off(a0, a1) do { } while (0) | |
6cd8a4bb SR |
780 | #endif |
781 | ||
68bf21aa SR |
782 | #ifdef CONFIG_FTRACE_MCOUNT_RECORD |
783 | extern void ftrace_init(void); | |
784 | #else | |
785 | static inline void ftrace_init(void) { } | |
786 | #endif | |
787 | ||
287b6e68 FW |
788 | /* |
789 | * Structure that defines an entry function trace. | |
a4a551b8 NK |
790 | * It's already packed but the attribute "packed" is needed |
791 | * to remove extra padding at the end. | |
287b6e68 FW |
792 | */ |
793 | struct ftrace_graph_ent { | |
794 | unsigned long func; /* Current function */ | |
795 | int depth; | |
a4a551b8 | 796 | } __packed; |
dd0e545f | 797 | |
caf4b323 FW |
798 | /* |
799 | * Structure that defines a return function trace. | |
a4a551b8 NK |
800 | * It's already packed but the attribute "packed" is needed |
801 | * to remove extra padding at the end. | |
caf4b323 | 802 | */ |
fb52607a | 803 | struct ftrace_graph_ret { |
caf4b323 | 804 | unsigned long func; /* Current function */ |
0231022c FW |
805 | /* Number of functions that overran the depth limit for current task */ |
806 | unsigned long overrun; | |
a4a551b8 NK |
807 | unsigned long long calltime; |
808 | unsigned long long rettime; | |
287b6e68 | 809 | int depth; |
a4a551b8 | 810 | } __packed; |
caf4b323 | 811 | |
62b915f1 JO |
812 | /* Type of the callback handlers for tracing function graph*/ |
813 | typedef void (*trace_func_graph_ret_t)(struct ftrace_graph_ret *); /* return */ | |
814 | typedef int (*trace_func_graph_ent_t)(struct ftrace_graph_ent *); /* entry */ | |
815 | ||
e8025bab SRV |
816 | extern int ftrace_graph_entry_stub(struct ftrace_graph_ent *trace); |
817 | ||
fb52607a | 818 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
8b96f011 | 819 | |
688f7089 SRV |
820 | struct fgraph_ops { |
821 | trace_func_graph_ent_t entryfunc; | |
822 | trace_func_graph_ret_t retfunc; | |
823 | }; | |
824 | ||
712406a6 SR |
825 | /* |
826 | * Stack of return addresses for functions | |
827 | * of a thread. | |
828 | * Used in struct thread_info | |
829 | */ | |
830 | struct ftrace_ret_stack { | |
831 | unsigned long ret; | |
832 | unsigned long func; | |
833 | unsigned long long calltime; | |
8861dd30 | 834 | #ifdef CONFIG_FUNCTION_PROFILER |
a2a16d6a | 835 | unsigned long long subtime; |
8861dd30 | 836 | #endif |
daa460a8 | 837 | #ifdef HAVE_FUNCTION_GRAPH_FP_TEST |
71e308a2 | 838 | unsigned long fp; |
daa460a8 | 839 | #endif |
9a7c348b JP |
840 | #ifdef HAVE_FUNCTION_GRAPH_RET_ADDR_PTR |
841 | unsigned long *retp; | |
842 | #endif | |
712406a6 SR |
843 | }; |
844 | ||
845 | /* | |
846 | * Primary handler of a function return. | |
847 | * It relays on ftrace_return_to_handler. | |
848 | * Defined in entry_32/64.S | |
849 | */ | |
850 | extern void return_to_handler(void); | |
851 | ||
852 | extern int | |
8114865f SRV |
853 | function_graph_enter(unsigned long ret, unsigned long func, |
854 | unsigned long frame_pointer, unsigned long *retp); | |
712406a6 | 855 | |
b0e21a61 SRV |
856 | struct ftrace_ret_stack * |
857 | ftrace_graph_get_ret_stack(struct task_struct *task, int idx); | |
858 | ||
223918e3 JP |
859 | unsigned long ftrace_graph_ret_addr(struct task_struct *task, int *idx, |
860 | unsigned long ret, unsigned long *retp); | |
861 | ||
8b96f011 FW |
862 | /* |
863 | * Sometimes we don't want to trace a function with the function | |
864 | * graph tracer but we want them to keep traced by the usual function | |
865 | * tracer if the function graph tracer is not configured. | |
866 | */ | |
867 | #define __notrace_funcgraph notrace | |
868 | ||
f201ae23 FW |
869 | #define FTRACE_RETFUNC_DEPTH 50 |
870 | #define FTRACE_RETSTACK_ALLOC_SIZE 32 | |
688f7089 SRV |
871 | |
872 | extern int register_ftrace_graph(struct fgraph_ops *ops); | |
873 | extern void unregister_ftrace_graph(struct fgraph_ops *ops); | |
287b6e68 | 874 | |
1b2f121c | 875 | extern bool ftrace_graph_is_dead(void); |
14a866c5 SR |
876 | extern void ftrace_graph_stop(void); |
877 | ||
287b6e68 FW |
878 | /* The current handlers in use */ |
879 | extern trace_func_graph_ret_t ftrace_graph_return; | |
880 | extern trace_func_graph_ent_t ftrace_graph_entry; | |
caf4b323 | 881 | |
fb52607a FW |
882 | extern void ftrace_graph_init_task(struct task_struct *t); |
883 | extern void ftrace_graph_exit_task(struct task_struct *t); | |
868baf07 | 884 | extern void ftrace_graph_init_idle_task(struct task_struct *t, int cpu); |
21a8c466 | 885 | |
380c4b14 FW |
886 | static inline void pause_graph_tracing(void) |
887 | { | |
888 | atomic_inc(¤t->tracing_graph_pause); | |
889 | } | |
890 | ||
891 | static inline void unpause_graph_tracing(void) | |
892 | { | |
893 | atomic_dec(¤t->tracing_graph_pause); | |
894 | } | |
5ac9f622 | 895 | #else /* !CONFIG_FUNCTION_GRAPH_TRACER */ |
8b96f011 FW |
896 | |
897 | #define __notrace_funcgraph | |
898 | ||
fb52607a FW |
899 | static inline void ftrace_graph_init_task(struct task_struct *t) { } |
900 | static inline void ftrace_graph_exit_task(struct task_struct *t) { } | |
868baf07 | 901 | static inline void ftrace_graph_init_idle_task(struct task_struct *t, int cpu) { } |
21a8c466 | 902 | |
688f7089 SRV |
903 | /* Define as macros as fgraph_ops may not be defined */ |
904 | #define register_ftrace_graph(ops) ({ -1; }) | |
905 | #define unregister_ftrace_graph(ops) do { } while (0) | |
380c4b14 | 906 | |
223918e3 JP |
907 | static inline unsigned long |
908 | ftrace_graph_ret_addr(struct task_struct *task, int *idx, unsigned long ret, | |
909 | unsigned long *retp) | |
910 | { | |
911 | return ret; | |
912 | } | |
913 | ||
380c4b14 FW |
914 | static inline void pause_graph_tracing(void) { } |
915 | static inline void unpause_graph_tracing(void) { } | |
5ac9f622 | 916 | #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ |
caf4b323 | 917 | |
ea4e2bc4 | 918 | #ifdef CONFIG_TRACING |
ea4e2bc4 SR |
919 | |
920 | /* flags for current->trace */ | |
921 | enum { | |
922 | TSK_TRACE_FL_TRACE_BIT = 0, | |
923 | TSK_TRACE_FL_GRAPH_BIT = 1, | |
924 | }; | |
925 | enum { | |
926 | TSK_TRACE_FL_TRACE = 1 << TSK_TRACE_FL_TRACE_BIT, | |
927 | TSK_TRACE_FL_GRAPH = 1 << TSK_TRACE_FL_GRAPH_BIT, | |
928 | }; | |
929 | ||
930 | static inline void set_tsk_trace_trace(struct task_struct *tsk) | |
931 | { | |
932 | set_bit(TSK_TRACE_FL_TRACE_BIT, &tsk->trace); | |
933 | } | |
934 | ||
935 | static inline void clear_tsk_trace_trace(struct task_struct *tsk) | |
936 | { | |
937 | clear_bit(TSK_TRACE_FL_TRACE_BIT, &tsk->trace); | |
938 | } | |
939 | ||
940 | static inline int test_tsk_trace_trace(struct task_struct *tsk) | |
941 | { | |
942 | return tsk->trace & TSK_TRACE_FL_TRACE; | |
943 | } | |
944 | ||
945 | static inline void set_tsk_trace_graph(struct task_struct *tsk) | |
946 | { | |
947 | set_bit(TSK_TRACE_FL_GRAPH_BIT, &tsk->trace); | |
948 | } | |
949 | ||
950 | static inline void clear_tsk_trace_graph(struct task_struct *tsk) | |
951 | { | |
952 | clear_bit(TSK_TRACE_FL_GRAPH_BIT, &tsk->trace); | |
953 | } | |
954 | ||
955 | static inline int test_tsk_trace_graph(struct task_struct *tsk) | |
956 | { | |
957 | return tsk->trace & TSK_TRACE_FL_GRAPH; | |
958 | } | |
959 | ||
cecbca96 FW |
960 | enum ftrace_dump_mode; |
961 | ||
962 | extern enum ftrace_dump_mode ftrace_dump_on_oops; | |
0daa2302 | 963 | extern int tracepoint_printk; |
526211bc | 964 | |
de7edd31 SRRH |
965 | extern void disable_trace_on_warning(void); |
966 | extern int __disable_trace_on_warning; | |
967 | ||
42391745 SRRH |
968 | int tracepoint_printk_sysctl(struct ctl_table *table, int write, |
969 | void __user *buffer, size_t *lenp, | |
970 | loff_t *ppos); | |
971 | ||
de7edd31 SRRH |
972 | #else /* CONFIG_TRACING */ |
973 | static inline void disable_trace_on_warning(void) { } | |
ea4e2bc4 SR |
974 | #endif /* CONFIG_TRACING */ |
975 | ||
e7b8e675 MF |
976 | #ifdef CONFIG_FTRACE_SYSCALLS |
977 | ||
978 | unsigned long arch_syscall_addr(int nr); | |
979 | ||
980 | #endif /* CONFIG_FTRACE_SYSCALLS */ | |
981 | ||
16444a8a | 982 | #endif /* _LINUX_FTRACE_H */ |