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 */
19struct trace_export {
20	struct trace_export __rcu	*next;
21	void (*write)(struct trace_export *, const void *, unsigned int);
22};
23
24int register_ftrace_export(struct trace_export *export);
25int unregister_ftrace_export(struct trace_export *export);
26
27struct trace_array;
28
29void trace_printk_init_buffers(void);
30int trace_array_printk(struct trace_array *tr, unsigned long ip,
31		const char *fmt, ...);
32int trace_array_init_printk(struct trace_array *tr);
33void trace_array_put(struct trace_array *tr);
34struct trace_array *trace_array_get_by_name(const char *name);
35int trace_array_destroy(struct trace_array *tr);
36#endif	/* CONFIG_TRACING */
37
38#endif	/* _LINUX_TRACE_H */