1*b2441318SGreg Kroah-Hartman /* SPDX-License-Identifier: GPL-2.0 */ 2478409ddSChunyan Zhang #ifndef _LINUX_TRACE_H 3478409ddSChunyan Zhang #define _LINUX_TRACE_H 4478409ddSChunyan Zhang 5478409ddSChunyan Zhang #ifdef CONFIG_TRACING 6478409ddSChunyan Zhang /* 7478409ddSChunyan Zhang * The trace export - an export of Ftrace output. The trace_export 8478409ddSChunyan Zhang * can process traces and export them to a registered destination as 9478409ddSChunyan Zhang * an addition to the current only output of Ftrace - i.e. ring buffer. 10478409ddSChunyan Zhang * 11478409ddSChunyan Zhang * If you want traces to be sent to some other place rather than ring 12478409ddSChunyan Zhang * buffer only, just need to register a new trace_export and implement 13478409ddSChunyan Zhang * its own .write() function for writing traces to the storage. 14478409ddSChunyan Zhang * 15478409ddSChunyan Zhang * next - pointer to the next trace_export 16478409ddSChunyan Zhang * write - copy traces which have been delt with ->commit() to 17478409ddSChunyan Zhang * the destination 18478409ddSChunyan Zhang */ 19478409ddSChunyan Zhang struct trace_export { 20478409ddSChunyan Zhang struct trace_export __rcu *next; 21478409ddSChunyan Zhang void (*write)(const void *, unsigned int); 22478409ddSChunyan Zhang }; 23478409ddSChunyan Zhang 24478409ddSChunyan Zhang int register_ftrace_export(struct trace_export *export); 25478409ddSChunyan Zhang int unregister_ftrace_export(struct trace_export *export); 26478409ddSChunyan Zhang 27478409ddSChunyan Zhang #endif /* CONFIG_TRACING */ 28478409ddSChunyan Zhang 29478409ddSChunyan Zhang #endif /* _LINUX_TRACE_H */ 30