Commit | Line | Data |
---|---|---|
16444a8a ACM |
1 | #ifndef _LINUX_FTRACE_H |
2 | #define _LINUX_FTRACE_H | |
3 | ||
16444a8a | 4 | #include <linux/linkage.h> |
d49dbf33 | 5 | #include <linux/fs.h> |
eb7fa935 | 6 | #include <linux/ktime.h> |
d13744cd FW |
7 | #include <linux/init.h> |
8 | #include <linux/types.h> | |
5601020f | 9 | #include <linux/kallsyms.h> |
16444a8a | 10 | |
606576ce | 11 | #ifdef CONFIG_FUNCTION_TRACER |
3e1932ad | 12 | |
b0fc494f SR |
13 | extern int ftrace_enabled; |
14 | extern int | |
15 | ftrace_enable_sysctl(struct ctl_table *table, int write, | |
16 | struct file *filp, void __user *buffer, size_t *lenp, | |
17 | loff_t *ppos); | |
18 | ||
16444a8a ACM |
19 | typedef void (*ftrace_func_t)(unsigned long ip, unsigned long parent_ip); |
20 | ||
21 | struct ftrace_ops { | |
22 | ftrace_func_t func; | |
23 | struct ftrace_ops *next; | |
24 | }; | |
25 | ||
26 | /* | |
27 | * The ftrace_ops must be a static and should also | |
28 | * be read_mostly. These functions do modify read_mostly variables | |
29 | * so use them sparely. Never free an ftrace_op or modify the | |
30 | * next pointer after it has been registered. Even after unregistering | |
31 | * it, the next pointer may still be used internally. | |
32 | */ | |
33 | int register_ftrace_function(struct ftrace_ops *ops); | |
34 | int unregister_ftrace_function(struct ftrace_ops *ops); | |
35 | void clear_ftrace_function(void); | |
36 | ||
37 | extern void ftrace_stub(unsigned long a0, unsigned long a1); | |
16444a8a | 38 | |
606576ce | 39 | #else /* !CONFIG_FUNCTION_TRACER */ |
16444a8a ACM |
40 | # define register_ftrace_function(ops) do { } while (0) |
41 | # define unregister_ftrace_function(ops) do { } while (0) | |
42 | # define clear_ftrace_function(ops) do { } while (0) | |
81adbdc0 | 43 | static inline void ftrace_kill(void) { } |
606576ce | 44 | #endif /* CONFIG_FUNCTION_TRACER */ |
352ad25a | 45 | |
3d083395 | 46 | #ifdef CONFIG_DYNAMIC_FTRACE |
3d083395 | 47 | |
3c1720f0 | 48 | enum { |
37ad5084 SR |
49 | FTRACE_FL_FREE = (1 << 0), |
50 | FTRACE_FL_FAILED = (1 << 1), | |
51 | FTRACE_FL_FILTER = (1 << 2), | |
52 | FTRACE_FL_ENABLED = (1 << 3), | |
41c52c0d | 53 | FTRACE_FL_NOTRACE = (1 << 4), |
0eb96701 | 54 | FTRACE_FL_CONVERTED = (1 << 5), |
ecea656d | 55 | FTRACE_FL_FROZEN = (1 << 6), |
3c1720f0 SR |
56 | }; |
57 | ||
3d083395 | 58 | struct dyn_ftrace { |
08f5ac90 SR |
59 | struct list_head list; |
60 | unsigned long ip; /* address of mcount call-site */ | |
61 | unsigned long flags; | |
3d083395 SR |
62 | }; |
63 | ||
e1c08bdd | 64 | int ftrace_force_update(void); |
77a2b37d | 65 | void ftrace_set_filter(unsigned char *buf, int len, int reset); |
e1c08bdd | 66 | |
3d083395 | 67 | /* defined in arch */ |
3c1720f0 SR |
68 | extern int ftrace_ip_converted(unsigned long ip); |
69 | extern unsigned char *ftrace_nop_replace(void); | |
70 | extern unsigned char *ftrace_call_replace(unsigned long ip, unsigned long addr); | |
d61f82d0 | 71 | extern int ftrace_dyn_arch_init(void *data); |
d61f82d0 SR |
72 | extern int ftrace_update_ftrace_func(ftrace_func_t func); |
73 | extern void ftrace_caller(void); | |
74 | extern void ftrace_call(void); | |
75 | extern void mcount_call(void); | |
ad90c0e3 | 76 | |
593eb8a2 SR |
77 | /** |
78 | * ftrace_modify_code - modify code segment | |
79 | * @ip: the address of the code segment | |
80 | * @old_code: the contents of what is expected to be there | |
81 | * @new_code: the code to patch in | |
82 | * | |
83 | * This is a very sensitive operation and great care needs | |
84 | * to be taken by the arch. The operation should carefully | |
85 | * read the location, check to see if what is read is indeed | |
86 | * what we expect it to be, and then on success of the compare, | |
87 | * it should write to the location. | |
88 | * | |
89 | * Return must be: | |
90 | * 0 on success | |
91 | * -EFAULT on error reading the location | |
92 | * -EINVAL on a failed compare of the contents | |
93 | * -EPERM on error writing to the location | |
94 | * Any other value will be considered a failure. | |
95 | */ | |
96 | extern int ftrace_modify_code(unsigned long ip, unsigned char *old_code, | |
97 | unsigned char *new_code); | |
98 | ||
ecea656d AS |
99 | extern int skip_trace(unsigned long ip); |
100 | ||
c0719e5a SR |
101 | extern void ftrace_release(void *start, unsigned long size); |
102 | ||
103 | extern void ftrace_disable_daemon(void); | |
104 | extern void ftrace_enable_daemon(void); | |
ad90c0e3 | 105 | |
e1c08bdd | 106 | #else |
ecea656d | 107 | # define skip_trace(ip) ({ 0; }) |
aeaee8a2 IM |
108 | # define ftrace_force_update() ({ 0; }) |
109 | # define ftrace_set_filter(buf, len, reset) do { } while (0) | |
ad90c0e3 SR |
110 | # define ftrace_disable_daemon() do { } while (0) |
111 | # define ftrace_enable_daemon() do { } while (0) | |
c0719e5a | 112 | static inline void ftrace_release(void *start, unsigned long size) { } |
ecea656d | 113 | #endif /* CONFIG_DYNAMIC_FTRACE */ |
352ad25a | 114 | |
aeaee8a2 IM |
115 | /* totally disable ftrace - can not re-enable after this */ |
116 | void ftrace_kill(void); | |
117 | ||
f43fdad8 IM |
118 | static inline void tracer_disable(void) |
119 | { | |
606576ce | 120 | #ifdef CONFIG_FUNCTION_TRACER |
f43fdad8 IM |
121 | ftrace_enabled = 0; |
122 | #endif | |
123 | } | |
124 | ||
37002735 HY |
125 | /* |
126 | * Ftrace disable/restore without lock. Some synchronization mechanism | |
9bdeb7b5 | 127 | * must be used to prevent ftrace_enabled to be changed between |
37002735 HY |
128 | * disable/restore. |
129 | */ | |
9bdeb7b5 HY |
130 | static inline int __ftrace_enabled_save(void) |
131 | { | |
606576ce | 132 | #ifdef CONFIG_FUNCTION_TRACER |
9bdeb7b5 HY |
133 | int saved_ftrace_enabled = ftrace_enabled; |
134 | ftrace_enabled = 0; | |
135 | return saved_ftrace_enabled; | |
136 | #else | |
137 | return 0; | |
138 | #endif | |
139 | } | |
140 | ||
141 | static inline void __ftrace_enabled_restore(int enabled) | |
142 | { | |
606576ce | 143 | #ifdef CONFIG_FUNCTION_TRACER |
9bdeb7b5 HY |
144 | ftrace_enabled = enabled; |
145 | #endif | |
146 | } | |
147 | ||
352ad25a SR |
148 | #ifdef CONFIG_FRAME_POINTER |
149 | /* TODO: need to fix this for ARM */ | |
150 | # define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0)) | |
151 | # define CALLER_ADDR1 ((unsigned long)__builtin_return_address(1)) | |
152 | # define CALLER_ADDR2 ((unsigned long)__builtin_return_address(2)) | |
153 | # define CALLER_ADDR3 ((unsigned long)__builtin_return_address(3)) | |
154 | # define CALLER_ADDR4 ((unsigned long)__builtin_return_address(4)) | |
155 | # define CALLER_ADDR5 ((unsigned long)__builtin_return_address(5)) | |
86387f7e | 156 | # define CALLER_ADDR6 ((unsigned long)__builtin_return_address(6)) |
352ad25a SR |
157 | #else |
158 | # define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0)) | |
159 | # define CALLER_ADDR1 0UL | |
160 | # define CALLER_ADDR2 0UL | |
161 | # define CALLER_ADDR3 0UL | |
162 | # define CALLER_ADDR4 0UL | |
163 | # define CALLER_ADDR5 0UL | |
86387f7e | 164 | # define CALLER_ADDR6 0UL |
352ad25a SR |
165 | #endif |
166 | ||
81d68a96 | 167 | #ifdef CONFIG_IRQSOFF_TRACER |
489f1396 IM |
168 | extern void time_hardirqs_on(unsigned long a0, unsigned long a1); |
169 | extern void time_hardirqs_off(unsigned long a0, unsigned long a1); | |
81d68a96 SR |
170 | #else |
171 | # define time_hardirqs_on(a0, a1) do { } while (0) | |
172 | # define time_hardirqs_off(a0, a1) do { } while (0) | |
173 | #endif | |
174 | ||
6cd8a4bb | 175 | #ifdef CONFIG_PREEMPT_TRACER |
489f1396 IM |
176 | extern void trace_preempt_on(unsigned long a0, unsigned long a1); |
177 | extern void trace_preempt_off(unsigned long a0, unsigned long a1); | |
6cd8a4bb SR |
178 | #else |
179 | # define trace_preempt_on(a0, a1) do { } while (0) | |
180 | # define trace_preempt_off(a0, a1) do { } while (0) | |
181 | #endif | |
182 | ||
b1829d27 | 183 | #ifdef CONFIG_TRACING |
74f4e369 IM |
184 | extern void |
185 | ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3); | |
2f2c99db SR |
186 | |
187 | /** | |
188 | * ftrace_printk - printf formatting in the ftrace buffer | |
189 | * @fmt: the printf format for printing | |
190 | * | |
191 | * Note: __ftrace_printk is an internal function for ftrace_printk and | |
192 | * the @ip is passed in via the ftrace_printk macro. | |
193 | * | |
194 | * This function allows a kernel developer to debug fast path sections | |
195 | * that printk is not appropriate for. By scattering in various | |
196 | * printk like tracing in the code, a developer can quickly see | |
197 | * where problems are occurring. | |
198 | * | |
199 | * This is intended as a debugging tool for the developer only. | |
200 | * Please refrain from leaving ftrace_printks scattered around in | |
201 | * your code. | |
202 | */ | |
203 | # define ftrace_printk(fmt...) __ftrace_printk(_THIS_IP_, fmt) | |
dd0e545f SR |
204 | extern int |
205 | __ftrace_printk(unsigned long ip, const char *fmt, ...) | |
206 | __attribute__ ((format (printf, 2, 3))); | |
3f5a54e3 | 207 | extern void ftrace_dump(void); |
74f4e369 IM |
208 | #else |
209 | static inline void | |
210 | ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3) { } | |
dd0e545f | 211 | static inline int |
7b928c23 IM |
212 | ftrace_printk(const char *fmt, ...) __attribute__ ((format (printf, 1, 0))); |
213 | ||
214 | static inline int | |
215 | ftrace_printk(const char *fmt, ...) | |
dd0e545f SR |
216 | { |
217 | return 0; | |
218 | } | |
3f5a54e3 | 219 | static inline void ftrace_dump(void) { } |
74f4e369 IM |
220 | #endif |
221 | ||
68bf21aa SR |
222 | #ifdef CONFIG_FTRACE_MCOUNT_RECORD |
223 | extern void ftrace_init(void); | |
90d595fe | 224 | extern void ftrace_init_module(unsigned long *start, unsigned long *end); |
68bf21aa SR |
225 | #else |
226 | static inline void ftrace_init(void) { } | |
90d595fe SR |
227 | static inline void |
228 | ftrace_init_module(unsigned long *start, unsigned long *end) { } | |
68bf21aa SR |
229 | #endif |
230 | ||
dd0e545f | 231 | |
d13744cd FW |
232 | struct boot_trace { |
233 | pid_t caller; | |
ca538f6b | 234 | char func[KSYM_NAME_LEN]; |
d13744cd | 235 | int result; |
ca538f6b | 236 | unsigned long long duration; /* usecs */ |
cb5ab742 FW |
237 | ktime_t calltime; |
238 | ktime_t rettime; | |
d13744cd FW |
239 | }; |
240 | ||
241 | #ifdef CONFIG_BOOT_TRACER | |
5601020f | 242 | extern void trace_boot(struct boot_trace *it, initcall_t fn); |
d13744cd | 243 | extern void start_boot_trace(void); |
097d036a | 244 | extern void stop_boot_trace(void); |
d13744cd | 245 | #else |
5601020f | 246 | static inline void trace_boot(struct boot_trace *it, initcall_t fn) { } |
d13744cd | 247 | static inline void start_boot_trace(void) { } |
097d036a | 248 | static inline void stop_boot_trace(void) { } |
d13744cd FW |
249 | #endif |
250 | ||
251 | ||
252 | ||
16444a8a | 253 | #endif /* _LINUX_FTRACE_H */ |