Linux kernel mirror (for testing)
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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _LINUX_TRACE_H
3#define _LINUX_TRACE_H
4
5#define TRACE_EXPORT_FUNCTION BIT(0)
6#define TRACE_EXPORT_EVENT BIT(1)
7#define TRACE_EXPORT_MARKER BIT(2)
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 */
23struct trace_export {
24 struct trace_export __rcu *next;
25 void (*write)(struct trace_export *, const void *, unsigned int);
26 int flags;
27};
28
29struct trace_array;
30
31#ifdef CONFIG_TRACING
32
33int register_ftrace_export(struct trace_export *export);
34int unregister_ftrace_export(struct trace_export *export);
35
36void trace_printk_init_buffers(void);
37__printf(3, 4)
38int trace_array_printk(struct trace_array *tr, unsigned long ip,
39 const char *fmt, ...);
40int trace_array_init_printk(struct trace_array *tr);
41void trace_array_put(struct trace_array *tr);
42struct trace_array *trace_array_get_by_name(const char *name);
43int trace_array_destroy(struct trace_array *tr);
44
45/* For osnoise tracer */
46int osnoise_arch_register(void);
47void osnoise_arch_unregister(void);
48void osnoise_trace_irq_entry(int id);
49void osnoise_trace_irq_exit(int id, const char *desc);
50
51#else /* CONFIG_TRACING */
52static inline int register_ftrace_export(struct trace_export *export)
53{
54 return -EINVAL;
55}
56static inline int unregister_ftrace_export(struct trace_export *export)
57{
58 return 0;
59}
60static inline void trace_printk_init_buffers(void)
61{
62}
63static inline int trace_array_printk(struct trace_array *tr, unsigned long ip,
64 const char *fmt, ...)
65{
66 return 0;
67}
68static inline int trace_array_init_printk(struct trace_array *tr)
69{
70 return -EINVAL;
71}
72static inline void trace_array_put(struct trace_array *tr)
73{
74}
75static inline struct trace_array *trace_array_get_by_name(const char *name)
76{
77 return NULL;
78}
79static inline int trace_array_destroy(struct trace_array *tr)
80{
81 return 0;
82}
83#endif /* CONFIG_TRACING */
84
85#endif /* _LINUX_TRACE_H */