1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_TRACE_H
3 #define _LINUX_TRACE_H
4 
5 #ifdef CONFIG_TRACING
6 /*
7  * The trace export - an export of Ftrace output. The trace_export
8  * can process traces and export them to a registered destination as
9  * an addition to the current only output of Ftrace - i.e. ring buffer.
10  *
11  * If you want traces to be sent to some other place rather than ring
12  * buffer only, just need to register a new trace_export and implement
13  * its own .write() function for writing traces to the storage.
14  *
15  * next		- pointer to the next trace_export
16  * write	- copy traces which have been delt with ->commit() to
17  *		  the destination
18  */
19 struct trace_export {
20 	struct trace_export __rcu	*next;
21 	void (*write)(struct trace_export *, const void *, unsigned int);
22 };
23 
24 int register_ftrace_export(struct trace_export *export);
25 int unregister_ftrace_export(struct trace_export *export);
26 
27 #endif	/* CONFIG_TRACING */
28 
29 #endif	/* _LINUX_TRACE_H */
30