1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _LINUX_TRACE_H 3 #define _LINUX_TRACE_H 4 5 #ifdef CONFIG_TRACING 6 7 #define TRACE_EXPORT_FUNCTION BIT(0) 8 9 /* 10 * The trace export - an export of Ftrace output. The trace_export 11 * can process traces and export them to a registered destination as 12 * an addition to the current only output of Ftrace - i.e. ring buffer. 13 * 14 * If you want traces to be sent to some other place rather than ring 15 * buffer only, just need to register a new trace_export and implement 16 * its own .write() function for writing traces to the storage. 17 * 18 * next - pointer to the next trace_export 19 * write - copy traces which have been delt with ->commit() to 20 * the destination 21 * flags - which ftrace to be exported 22 */ 23 struct trace_export { 24 struct trace_export __rcu *next; 25 void (*write)(struct trace_export *, const void *, unsigned int); 26 int flags; 27 }; 28 29 int register_ftrace_export(struct trace_export *export); 30 int unregister_ftrace_export(struct trace_export *export); 31 32 struct trace_array; 33 34 void trace_printk_init_buffers(void); 35 int trace_array_printk(struct trace_array *tr, unsigned long ip, 36 const char *fmt, ...); 37 int trace_array_init_printk(struct trace_array *tr); 38 void trace_array_put(struct trace_array *tr); 39 struct trace_array *trace_array_get_by_name(const char *name); 40 int trace_array_destroy(struct trace_array *tr); 41 #endif /* CONFIG_TRACING */ 42 43 #endif /* _LINUX_TRACE_H */ 44