ftrace_internal.h

 1/* SPDX-License-Identifier: GPL-2.0 */
 2#ifndef _LINUX_KERNEL_FTRACE_INTERNAL_H
 3#define  _LINUX_KERNEL_FTRACE_INTERNAL_H
 4
 5int __register_ftrace_function(struct ftrace_ops *ops);
 6int __unregister_ftrace_function(struct ftrace_ops *ops);
 7
 8#ifdef CONFIG_FUNCTION_TRACER
 9
10extern struct mutex ftrace_lock;
11extern struct ftrace_ops global_ops;
12
13#ifdef CONFIG_DYNAMIC_FTRACE
14
15int ftrace_startup(struct ftrace_ops *ops, int command);
16int ftrace_shutdown(struct ftrace_ops *ops, int command);
17int ftrace_ops_test(struct ftrace_ops *ops, unsigned long ip, void *regs);
18int ftrace_startup_subops(struct ftrace_ops *ops, struct ftrace_ops *subops, int command);
19int 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	})
38static inline int
39ftrace_ops_test(struct ftrace_ops *ops, unsigned long ip, void *regs)
40{
41	return 1;
42}
43static inline int ftrace_startup_subops(struct ftrace_ops *ops, struct ftrace_ops *subops, int command)
44{
45	return -EINVAL;
46}
47static 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
54extern int ftrace_graph_active;
55# ifdef CONFIG_DYNAMIC_FTRACE
56extern void fgraph_update_pid_func(void);
57# else
58static inline void fgraph_update_pid_func(void) {}
59# endif
60#else /* !CONFIG_FUNCTION_GRAPH_TRACER */
61# define ftrace_graph_active 0
62static 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