1b2441318SGreg 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; 21a773d419SFelipe Balbi void (*write)(struct trace_export *, 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 27*2d6425afSDivya Indi struct trace_array; 28*2d6425afSDivya Indi 29*2d6425afSDivya Indi void trace_printk_init_buffers(void); 30*2d6425afSDivya Indi int trace_array_printk(struct trace_array *tr, unsigned long ip, 31*2d6425afSDivya Indi const char *fmt, ...); 32*2d6425afSDivya Indi struct trace_array *trace_array_create(const char *name); 33*2d6425afSDivya Indi int trace_array_destroy(struct trace_array *tr); 34478409ddSChunyan Zhang #endif /* CONFIG_TRACING */ 35478409ddSChunyan Zhang 36478409ddSChunyan Zhang #endif /* _LINUX_TRACE_H */ 37