Arnaldo Carvalho de Melo | 16444a8 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1 | #ifndef _LINUX_FTRACE_H |
| 2 | #define _LINUX_FTRACE_H |
| 3 | |
Arnaldo Carvalho de Melo | 16444a8 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 4 | #include <linux/linkage.h> |
Ingo Molnar | d49dbf3 | 2008-05-16 10:41:53 +0200 | [diff] [blame] | 5 | #include <linux/fs.h> |
Steven Noonan | eb7fa93 | 2008-10-02 12:00:07 -0700 | [diff] [blame] | 6 | #include <linux/ktime.h> |
Frédéric Weisbecker | d13744c | 2008-09-23 11:32:08 +0100 | [diff] [blame] | 7 | #include <linux/init.h> |
| 8 | #include <linux/types.h> |
Frederic Weisbecker | 5601020 | 2008-10-02 13:26:05 +0200 | [diff] [blame] | 9 | #include <linux/kallsyms.h> |
Arnaldo Carvalho de Melo | 16444a8 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 10 | |
Steven Rostedt | 606576c | 2008-10-06 19:06:12 -0400 | [diff] [blame] | 11 | #ifdef CONFIG_FUNCTION_TRACER |
Ingo Molnar | 3e1932a | 2008-10-02 17:45:47 +0200 | [diff] [blame] | 12 | |
Steven Rostedt | b0fc494 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 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 | |
Arnaldo Carvalho de Melo | 16444a8 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 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 | |
Steven Rostedt | 60a7ecf | 2008-11-05 16:05:44 -0500 | [diff] [blame] | 26 | extern int function_trace_stop; |
| 27 | |
| 28 | /** |
| 29 | * ftrace_stop - stop function tracer. |
| 30 | * |
| 31 | * A quick way to stop the function tracer. Note this an on off switch, |
| 32 | * it is not something that is recursive like preempt_disable. |
| 33 | * This does not disable the calling of mcount, it only stops the |
| 34 | * calling of functions from mcount. |
| 35 | */ |
| 36 | static inline void ftrace_stop(void) |
| 37 | { |
| 38 | function_trace_stop = 1; |
| 39 | } |
| 40 | |
| 41 | /** |
| 42 | * ftrace_start - start the function tracer. |
| 43 | * |
| 44 | * This function is the inverse of ftrace_stop. This does not enable |
| 45 | * the function tracing if the function tracer is disabled. This only |
| 46 | * sets the function tracer flag to continue calling the functions |
| 47 | * from mcount. |
| 48 | */ |
| 49 | static inline void ftrace_start(void) |
| 50 | { |
| 51 | function_trace_stop = 0; |
| 52 | } |
| 53 | |
Arnaldo Carvalho de Melo | 16444a8 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 54 | /* |
| 55 | * The ftrace_ops must be a static and should also |
| 56 | * be read_mostly. These functions do modify read_mostly variables |
| 57 | * so use them sparely. Never free an ftrace_op or modify the |
| 58 | * next pointer after it has been registered. Even after unregistering |
| 59 | * it, the next pointer may still be used internally. |
| 60 | */ |
| 61 | int register_ftrace_function(struct ftrace_ops *ops); |
| 62 | int unregister_ftrace_function(struct ftrace_ops *ops); |
| 63 | void clear_ftrace_function(void); |
| 64 | |
| 65 | extern void ftrace_stub(unsigned long a0, unsigned long a1); |
Arnaldo Carvalho de Melo | 16444a8 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 66 | |
Steven Rostedt | 606576c | 2008-10-06 19:06:12 -0400 | [diff] [blame] | 67 | #else /* !CONFIG_FUNCTION_TRACER */ |
Arnaldo Carvalho de Melo | 16444a8 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 68 | # define register_ftrace_function(ops) do { } while (0) |
| 69 | # define unregister_ftrace_function(ops) do { } while (0) |
| 70 | # define clear_ftrace_function(ops) do { } while (0) |
Steven Rostedt | 81adbdc | 2008-10-23 09:33:02 -0400 | [diff] [blame] | 71 | static inline void ftrace_kill(void) { } |
Steven Rostedt | 60a7ecf | 2008-11-05 16:05:44 -0500 | [diff] [blame] | 72 | static inline void ftrace_stop(void) { } |
| 73 | static inline void ftrace_start(void) { } |
Steven Rostedt | 606576c | 2008-10-06 19:06:12 -0400 | [diff] [blame] | 74 | #endif /* CONFIG_FUNCTION_TRACER */ |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 75 | |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 76 | #ifdef CONFIG_DYNAMIC_FTRACE |
Steven Rostedt | 31e8890 | 2008-11-14 16:21:19 -0800 | [diff] [blame] | 77 | /* asm/ftrace.h must be defined for archs supporting dynamic ftrace */ |
| 78 | #include <asm/ftrace.h> |
| 79 | |
Steven Rostedt | 3c1720f | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 80 | enum { |
Steven Rostedt | 37ad508 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 81 | FTRACE_FL_FREE = (1 << 0), |
| 82 | FTRACE_FL_FAILED = (1 << 1), |
| 83 | FTRACE_FL_FILTER = (1 << 2), |
| 84 | FTRACE_FL_ENABLED = (1 << 3), |
Steven Rostedt | 41c52c0 | 2008-05-22 11:46:33 -0400 | [diff] [blame] | 85 | FTRACE_FL_NOTRACE = (1 << 4), |
Abhishek Sagar | 0eb9670 | 2008-06-01 21:47:30 +0530 | [diff] [blame] | 86 | FTRACE_FL_CONVERTED = (1 << 5), |
Abhishek Sagar | ecea656 | 2008-06-21 23:47:53 +0530 | [diff] [blame] | 87 | FTRACE_FL_FROZEN = (1 << 6), |
Steven Rostedt | 3c1720f | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 88 | }; |
| 89 | |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 90 | struct dyn_ftrace { |
Steven Rostedt | 08f5ac90 | 2008-10-23 09:33:07 -0400 | [diff] [blame] | 91 | struct list_head list; |
| 92 | unsigned long ip; /* address of mcount call-site */ |
| 93 | unsigned long flags; |
Steven Rostedt | 31e8890 | 2008-11-14 16:21:19 -0800 | [diff] [blame] | 94 | struct dyn_arch_ftrace arch; |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 95 | }; |
| 96 | |
Steven Rostedt | e1c08bd | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 97 | int ftrace_force_update(void); |
Steven Rostedt | 77a2b37 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 98 | void ftrace_set_filter(unsigned char *buf, int len, int reset); |
Steven Rostedt | e1c08bd | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 99 | |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 100 | /* defined in arch */ |
Steven Rostedt | 3c1720f | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 101 | extern int ftrace_ip_converted(unsigned long ip); |
Steven Rostedt | d61f82d | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 102 | extern int ftrace_dyn_arch_init(void *data); |
Steven Rostedt | d61f82d | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 103 | extern int ftrace_update_ftrace_func(ftrace_func_t func); |
| 104 | extern void ftrace_caller(void); |
| 105 | extern void ftrace_call(void); |
| 106 | extern void mcount_call(void); |
Steven Rostedt | ad90c0e | 2008-05-27 20:48:37 -0400 | [diff] [blame] | 107 | |
Steven Rostedt | 593eb8a | 2008-10-23 09:32:59 -0400 | [diff] [blame] | 108 | /** |
Steven Rostedt | 31e8890 | 2008-11-14 16:21:19 -0800 | [diff] [blame] | 109 | * ftrace_make_nop - convert code into top |
| 110 | * @mod: module structure if called by module load initialization |
| 111 | * @rec: the mcount call site record |
| 112 | * @addr: the address that the call site should be calling |
Steven Rostedt | 593eb8a | 2008-10-23 09:32:59 -0400 | [diff] [blame] | 113 | * |
| 114 | * This is a very sensitive operation and great care needs |
| 115 | * to be taken by the arch. The operation should carefully |
| 116 | * read the location, check to see if what is read is indeed |
| 117 | * what we expect it to be, and then on success of the compare, |
| 118 | * it should write to the location. |
| 119 | * |
Steven Rostedt | 31e8890 | 2008-11-14 16:21:19 -0800 | [diff] [blame] | 120 | * The code segment at @rec->ip should be a caller to @addr |
| 121 | * |
Steven Rostedt | 593eb8a | 2008-10-23 09:32:59 -0400 | [diff] [blame] | 122 | * Return must be: |
| 123 | * 0 on success |
| 124 | * -EFAULT on error reading the location |
| 125 | * -EINVAL on a failed compare of the contents |
| 126 | * -EPERM on error writing to the location |
| 127 | * Any other value will be considered a failure. |
| 128 | */ |
Steven Rostedt | 31e8890 | 2008-11-14 16:21:19 -0800 | [diff] [blame] | 129 | extern int ftrace_make_nop(struct module *mod, |
| 130 | struct dyn_ftrace *rec, unsigned long addr); |
| 131 | |
| 132 | /** |
| 133 | * ftrace_make_call - convert a nop call site into a call to addr |
| 134 | * @rec: the mcount call site record |
| 135 | * @addr: the address that the call site should call |
| 136 | * |
| 137 | * This is a very sensitive operation and great care needs |
| 138 | * to be taken by the arch. The operation should carefully |
| 139 | * read the location, check to see if what is read is indeed |
| 140 | * what we expect it to be, and then on success of the compare, |
| 141 | * it should write to the location. |
| 142 | * |
| 143 | * The code segment at @rec->ip should be a nop |
| 144 | * |
| 145 | * Return must be: |
| 146 | * 0 on success |
| 147 | * -EFAULT on error reading the location |
| 148 | * -EINVAL on a failed compare of the contents |
| 149 | * -EPERM on error writing to the location |
| 150 | * Any other value will be considered a failure. |
| 151 | */ |
| 152 | extern int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr); |
| 153 | |
| 154 | |
| 155 | /* May be defined in arch */ |
| 156 | extern int ftrace_arch_read_dyn_info(char *buf, int size); |
Steven Rostedt | 593eb8a | 2008-10-23 09:32:59 -0400 | [diff] [blame] | 157 | |
Abhishek Sagar | ecea656 | 2008-06-21 23:47:53 +0530 | [diff] [blame] | 158 | extern int skip_trace(unsigned long ip); |
| 159 | |
Steven Rostedt | c0719e5 | 2008-09-06 01:06:03 -0400 | [diff] [blame] | 160 | extern void ftrace_release(void *start, unsigned long size); |
| 161 | |
| 162 | extern void ftrace_disable_daemon(void); |
| 163 | extern void ftrace_enable_daemon(void); |
Steven Rostedt | e1c08bd | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 164 | #else |
Abhishek Sagar | ecea656 | 2008-06-21 23:47:53 +0530 | [diff] [blame] | 165 | # define skip_trace(ip) ({ 0; }) |
Ingo Molnar | aeaee8a | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 166 | # define ftrace_force_update() ({ 0; }) |
| 167 | # define ftrace_set_filter(buf, len, reset) do { } while (0) |
Steven Rostedt | ad90c0e | 2008-05-27 20:48:37 -0400 | [diff] [blame] | 168 | # define ftrace_disable_daemon() do { } while (0) |
| 169 | # define ftrace_enable_daemon() do { } while (0) |
Steven Rostedt | c0719e5 | 2008-09-06 01:06:03 -0400 | [diff] [blame] | 170 | static inline void ftrace_release(void *start, unsigned long size) { } |
Abhishek Sagar | ecea656 | 2008-06-21 23:47:53 +0530 | [diff] [blame] | 171 | #endif /* CONFIG_DYNAMIC_FTRACE */ |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 172 | |
Ingo Molnar | aeaee8a | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 173 | /* totally disable ftrace - can not re-enable after this */ |
| 174 | void ftrace_kill(void); |
| 175 | |
Ingo Molnar | f43fdad | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 176 | static inline void tracer_disable(void) |
| 177 | { |
Steven Rostedt | 606576c | 2008-10-06 19:06:12 -0400 | [diff] [blame] | 178 | #ifdef CONFIG_FUNCTION_TRACER |
Ingo Molnar | f43fdad | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 179 | ftrace_enabled = 0; |
| 180 | #endif |
| 181 | } |
| 182 | |
Huang Ying | 3700273 | 2008-08-18 16:24:56 +0800 | [diff] [blame] | 183 | /* |
| 184 | * Ftrace disable/restore without lock. Some synchronization mechanism |
Huang Ying | 9bdeb7b | 2008-08-15 00:40:25 -0700 | [diff] [blame] | 185 | * must be used to prevent ftrace_enabled to be changed between |
Huang Ying | 3700273 | 2008-08-18 16:24:56 +0800 | [diff] [blame] | 186 | * disable/restore. |
| 187 | */ |
Huang Ying | 9bdeb7b | 2008-08-15 00:40:25 -0700 | [diff] [blame] | 188 | static inline int __ftrace_enabled_save(void) |
| 189 | { |
Steven Rostedt | 606576c | 2008-10-06 19:06:12 -0400 | [diff] [blame] | 190 | #ifdef CONFIG_FUNCTION_TRACER |
Huang Ying | 9bdeb7b | 2008-08-15 00:40:25 -0700 | [diff] [blame] | 191 | int saved_ftrace_enabled = ftrace_enabled; |
| 192 | ftrace_enabled = 0; |
| 193 | return saved_ftrace_enabled; |
| 194 | #else |
| 195 | return 0; |
| 196 | #endif |
| 197 | } |
| 198 | |
| 199 | static inline void __ftrace_enabled_restore(int enabled) |
| 200 | { |
Steven Rostedt | 606576c | 2008-10-06 19:06:12 -0400 | [diff] [blame] | 201 | #ifdef CONFIG_FUNCTION_TRACER |
Huang Ying | 9bdeb7b | 2008-08-15 00:40:25 -0700 | [diff] [blame] | 202 | ftrace_enabled = enabled; |
| 203 | #endif |
| 204 | } |
| 205 | |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 206 | #ifdef CONFIG_FRAME_POINTER |
| 207 | /* TODO: need to fix this for ARM */ |
| 208 | # define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0)) |
| 209 | # define CALLER_ADDR1 ((unsigned long)__builtin_return_address(1)) |
| 210 | # define CALLER_ADDR2 ((unsigned long)__builtin_return_address(2)) |
| 211 | # define CALLER_ADDR3 ((unsigned long)__builtin_return_address(3)) |
| 212 | # define CALLER_ADDR4 ((unsigned long)__builtin_return_address(4)) |
| 213 | # define CALLER_ADDR5 ((unsigned long)__builtin_return_address(5)) |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 214 | # define CALLER_ADDR6 ((unsigned long)__builtin_return_address(6)) |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 215 | #else |
| 216 | # define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0)) |
| 217 | # define CALLER_ADDR1 0UL |
| 218 | # define CALLER_ADDR2 0UL |
| 219 | # define CALLER_ADDR3 0UL |
| 220 | # define CALLER_ADDR4 0UL |
| 221 | # define CALLER_ADDR5 0UL |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 222 | # define CALLER_ADDR6 0UL |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 223 | #endif |
| 224 | |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 225 | #ifdef CONFIG_IRQSOFF_TRACER |
Ingo Molnar | 489f139 | 2008-02-25 13:38:05 +0100 | [diff] [blame] | 226 | extern void time_hardirqs_on(unsigned long a0, unsigned long a1); |
| 227 | extern void time_hardirqs_off(unsigned long a0, unsigned long a1); |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 228 | #else |
| 229 | # define time_hardirqs_on(a0, a1) do { } while (0) |
| 230 | # define time_hardirqs_off(a0, a1) do { } while (0) |
| 231 | #endif |
| 232 | |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 233 | #ifdef CONFIG_PREEMPT_TRACER |
Ingo Molnar | 489f139 | 2008-02-25 13:38:05 +0100 | [diff] [blame] | 234 | extern void trace_preempt_on(unsigned long a0, unsigned long a1); |
| 235 | extern void trace_preempt_off(unsigned long a0, unsigned long a1); |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 236 | #else |
| 237 | # define trace_preempt_on(a0, a1) do { } while (0) |
| 238 | # define trace_preempt_off(a0, a1) do { } while (0) |
| 239 | #endif |
| 240 | |
Ingo Molnar | b1829d2 | 2008-05-28 01:22:08 +0200 | [diff] [blame] | 241 | #ifdef CONFIG_TRACING |
Steven Rostedt | 944ac42 | 2008-10-23 19:26:08 -0400 | [diff] [blame] | 242 | extern int ftrace_dump_on_oops; |
| 243 | |
Steven Rostedt | 0f04870 | 2008-11-05 16:05:44 -0500 | [diff] [blame] | 244 | extern void tracing_start(void); |
| 245 | extern void tracing_stop(void); |
| 246 | |
Ingo Molnar | 74f4e36 | 2008-05-12 21:21:15 +0200 | [diff] [blame] | 247 | extern void |
| 248 | ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3); |
Steven Rostedt | 2f2c99d | 2008-08-01 16:45:49 -0400 | [diff] [blame] | 249 | |
| 250 | /** |
| 251 | * ftrace_printk - printf formatting in the ftrace buffer |
| 252 | * @fmt: the printf format for printing |
| 253 | * |
| 254 | * Note: __ftrace_printk is an internal function for ftrace_printk and |
| 255 | * the @ip is passed in via the ftrace_printk macro. |
| 256 | * |
| 257 | * This function allows a kernel developer to debug fast path sections |
| 258 | * that printk is not appropriate for. By scattering in various |
| 259 | * printk like tracing in the code, a developer can quickly see |
| 260 | * where problems are occurring. |
| 261 | * |
| 262 | * This is intended as a debugging tool for the developer only. |
| 263 | * Please refrain from leaving ftrace_printks scattered around in |
| 264 | * your code. |
| 265 | */ |
| 266 | # define ftrace_printk(fmt...) __ftrace_printk(_THIS_IP_, fmt) |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 267 | extern int |
| 268 | __ftrace_printk(unsigned long ip, const char *fmt, ...) |
| 269 | __attribute__ ((format (printf, 2, 3))); |
Steven Rostedt | 3f5a54e | 2008-07-30 22:36:46 -0400 | [diff] [blame] | 270 | extern void ftrace_dump(void); |
Ingo Molnar | 74f4e36 | 2008-05-12 21:21:15 +0200 | [diff] [blame] | 271 | #else |
| 272 | static inline void |
| 273 | ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3) { } |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 274 | static inline int |
Ingo Molnar | 7b928c2 | 2008-08-15 17:48:02 +0200 | [diff] [blame] | 275 | ftrace_printk(const char *fmt, ...) __attribute__ ((format (printf, 1, 0))); |
| 276 | |
Steven Rostedt | 0f04870 | 2008-11-05 16:05:44 -0500 | [diff] [blame] | 277 | static inline void tracing_start(void) { } |
| 278 | static inline void tracing_stop(void) { } |
Ingo Molnar | 7b928c2 | 2008-08-15 17:48:02 +0200 | [diff] [blame] | 279 | static inline int |
| 280 | ftrace_printk(const char *fmt, ...) |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 281 | { |
| 282 | return 0; |
| 283 | } |
Steven Rostedt | 3f5a54e | 2008-07-30 22:36:46 -0400 | [diff] [blame] | 284 | static inline void ftrace_dump(void) { } |
Ingo Molnar | 74f4e36 | 2008-05-12 21:21:15 +0200 | [diff] [blame] | 285 | #endif |
| 286 | |
Steven Rostedt | 68bf21a | 2008-08-14 15:45:08 -0400 | [diff] [blame] | 287 | #ifdef CONFIG_FTRACE_MCOUNT_RECORD |
| 288 | extern void ftrace_init(void); |
Steven Rostedt | 31e8890 | 2008-11-14 16:21:19 -0800 | [diff] [blame] | 289 | extern void ftrace_init_module(struct module *mod, |
| 290 | unsigned long *start, unsigned long *end); |
Steven Rostedt | 68bf21a | 2008-08-14 15:45:08 -0400 | [diff] [blame] | 291 | #else |
| 292 | static inline void ftrace_init(void) { } |
Steven Rostedt | 90d595f | 2008-08-14 15:45:09 -0400 | [diff] [blame] | 293 | static inline void |
Steven Rostedt | 31e8890 | 2008-11-14 16:21:19 -0800 | [diff] [blame] | 294 | ftrace_init_module(struct module *mod, |
| 295 | unsigned long *start, unsigned long *end) { } |
Steven Rostedt | 68bf21a | 2008-08-14 15:45:08 -0400 | [diff] [blame] | 296 | #endif |
| 297 | |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 298 | |
Frederic Weisbecker | 71566a0 | 2008-10-31 12:57:20 +0100 | [diff] [blame] | 299 | /* |
Frederic Weisbecker | caf4b32 | 2008-11-11 07:03:45 +0100 | [diff] [blame] | 300 | * Structure that defines a return function trace. |
| 301 | */ |
| 302 | struct ftrace_retfunc { |
| 303 | unsigned long ret; /* Return address */ |
| 304 | unsigned long func; /* Current function */ |
| 305 | unsigned long long calltime; |
| 306 | unsigned long long rettime; |
| 307 | }; |
| 308 | |
| 309 | #ifdef CONFIG_FUNCTION_RET_TRACER |
| 310 | /* Type of a callback handler of tracing return function */ |
| 311 | typedef void (*trace_function_return_t)(struct ftrace_retfunc *); |
| 312 | |
| 313 | extern void register_ftrace_return(trace_function_return_t func); |
| 314 | /* The current handler in use */ |
| 315 | extern trace_function_return_t ftrace_function_return; |
| 316 | extern void unregister_ftrace_return(void); |
| 317 | #endif |
| 318 | |
Arnaldo Carvalho de Melo | 16444a8 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 319 | #endif /* _LINUX_FTRACE_H */ |