1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_KERNEL_FTRACE_INTERNAL_H
3 #define _LINUX_KERNEL_FTRACE_INTERNAL_H
4
5 int __register_ftrace_function(struct ftrace_ops *ops);
6 int __unregister_ftrace_function(struct ftrace_ops *ops);
7
8 #ifdef CONFIG_FUNCTION_TRACER
9
10 extern struct mutex ftrace_lock;
11 extern struct ftrace_ops global_ops;
12
13 #ifdef CONFIG_DYNAMIC_FTRACE
14
15 int ftrace_startup(struct ftrace_ops *ops, int command);
16 int ftrace_shutdown(struct ftrace_ops *ops, int command);
17 int ftrace_ops_test(struct ftrace_ops *ops, unsigned long ip, void *regs);
18 int ftrace_startup_subops(struct ftrace_ops *ops, struct ftrace_ops *subops, int command);
19 int ftrace_shutdown_subops(struct ftrace_ops *ops, struct ftrace_ops *subops, int command);
20
21 #else /* !CONFIG_DYNAMIC_FTRACE */
22
23 /* Keep as macros so we do not need to define the commands */
24 # define ftrace_startup(ops, command) \
25 ({ \
26 int ___ret = __register_ftrace_function(ops); \
27 if (!___ret) \
28 (ops)->flags |= FTRACE_OPS_FL_ENABLED; \
29 ___ret; \
30 })
31 # define ftrace_shutdown(ops, command) \
32 ({ \
33 int ___ret = __unregister_ftrace_function(ops); \
34 if (!___ret) \
35 (ops)->flags &= ~FTRACE_OPS_FL_ENABLED; \
36 ___ret; \
37 })
38 static inline int
ftrace_ops_test(struct ftrace_ops * ops,unsigned long ip,void * regs)39 ftrace_ops_test(struct ftrace_ops *ops, unsigned long ip, void *regs)
40 {
41 return 1;
42 }
ftrace_startup_subops(struct ftrace_ops * ops,struct ftrace_ops * subops,int command)43 static inline int ftrace_startup_subops(struct ftrace_ops *ops, struct ftrace_ops *subops, int command)
44 {
45 return -EINVAL;
46 }
ftrace_shutdown_subops(struct ftrace_ops * ops,struct ftrace_ops * subops,int command)47 static inline int ftrace_shutdown_subops(struct ftrace_ops *ops, struct ftrace_ops *subops, int command)
48 {
49 return -EINVAL;
50 }
51 #endif /* CONFIG_DYNAMIC_FTRACE */
52
53 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
54 extern int ftrace_graph_active;
55 # ifdef CONFIG_DYNAMIC_FTRACE
56 extern void fgraph_update_pid_func(void);
57 # else
fgraph_update_pid_func(void)58 static inline void fgraph_update_pid_func(void) {}
59 # endif
60 #else /* !CONFIG_FUNCTION_GRAPH_TRACER */
61 # define ftrace_graph_active 0
fgraph_update_pid_func(void)62 static inline void fgraph_update_pid_func(void) {}
63 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
64
65 #else /* !CONFIG_FUNCTION_TRACER */
66 #endif /* CONFIG_FUNCTION_TRACER */
67
68 #endif
69