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 6*8438f521STingwei Zhang 7*8438f521STingwei Zhang #define TRACE_EXPORT_FUNCTION BIT(0) 8*8438f521STingwei Zhang 9478409ddSChunyan Zhang /* 10478409ddSChunyan Zhang * The trace export - an export of Ftrace output. The trace_export 11478409ddSChunyan Zhang * can process traces and export them to a registered destination as 12478409ddSChunyan Zhang * an addition to the current only output of Ftrace - i.e. ring buffer. 13478409ddSChunyan Zhang * 14478409ddSChunyan Zhang * If you want traces to be sent to some other place rather than ring 15478409ddSChunyan Zhang * buffer only, just need to register a new trace_export and implement 16478409ddSChunyan Zhang * its own .write() function for writing traces to the storage. 17478409ddSChunyan Zhang * 18478409ddSChunyan Zhang * next - pointer to the next trace_export 19478409ddSChunyan Zhang * write - copy traces which have been delt with ->commit() to 20478409ddSChunyan Zhang * the destination 21*8438f521STingwei Zhang * flags - which ftrace to be exported 22478409ddSChunyan Zhang */ 23478409ddSChunyan Zhang struct trace_export { 24478409ddSChunyan Zhang struct trace_export __rcu *next; 25a773d419SFelipe Balbi void (*write)(struct trace_export *, const void *, unsigned int); 26*8438f521STingwei Zhang int flags; 27478409ddSChunyan Zhang }; 28478409ddSChunyan Zhang 29478409ddSChunyan Zhang int register_ftrace_export(struct trace_export *export); 30478409ddSChunyan Zhang int unregister_ftrace_export(struct trace_export *export); 31478409ddSChunyan Zhang 322d6425afSDivya Indi struct trace_array; 332d6425afSDivya Indi 342d6425afSDivya Indi void trace_printk_init_buffers(void); 352d6425afSDivya Indi int trace_array_printk(struct trace_array *tr, unsigned long ip, 362d6425afSDivya Indi const char *fmt, ...); 3738ce2a9eSSteven Rostedt (VMware) int trace_array_init_printk(struct trace_array *tr); 3828879787SDivya Indi void trace_array_put(struct trace_array *tr); 3928879787SDivya Indi struct trace_array *trace_array_get_by_name(const char *name); 402d6425afSDivya Indi int trace_array_destroy(struct trace_array *tr); 41478409ddSChunyan Zhang #endif /* CONFIG_TRACING */ 42478409ddSChunyan Zhang 43478409ddSChunyan Zhang #endif /* _LINUX_TRACE_H */ 44