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 */