1/* SPDX-License-Identifier: GPL-2.0 */
2
3/*
4 * If TRACE_SYSTEM is defined, that will be the directory created
5 * in the ftrace directory under /sys/kernel/tracing/events/<system>
6 *
7 * The define_trace.h below will also look for a file name of
8 * TRACE_SYSTEM.h where TRACE_SYSTEM is what is defined here.
9 * In this case, it would look for sample-trace.h
10 *
11 * If the header name will be different than the system name
12 * (as in this case), then you can override the header name that
13 * define_trace.h will look up by defining TRACE_INCLUDE_FILE
14 *
15 * This file is called sample-trace-array.h but we want the system
16 * to be called "sample-subsystem". Therefore we must define the name of this
17 * file:
18 *
19 * #define TRACE_INCLUDE_FILE sample-trace-array
20 *
21 * As we do in the bottom of this file.
22 *
23 * Notice that TRACE_SYSTEM should be defined outside of #if
24 * protection, just like TRACE_INCLUDE_FILE.
25 */
26#undef TRACE_SYSTEM
27#define TRACE_SYSTEM sample-subsystem
28
29/*
30 * TRACE_SYSTEM is expected to be a C valid variable (alpha-numeric
31 * and underscore), although it may start with numbers. If for some
32 * reason it is not, you need to add the following lines:
33 */
34#undef TRACE_SYSTEM_VAR
35#define TRACE_SYSTEM_VAR sample_subsystem
36
37/*
38 * But the above is only needed if TRACE_SYSTEM is not alpha-numeric
39 * and underscored. By default, TRACE_SYSTEM_VAR will be equal to
40 * TRACE_SYSTEM. As TRACE_SYSTEM_VAR must be alpha-numeric, if
41 * TRACE_SYSTEM is not, then TRACE_SYSTEM_VAR must be defined with
42 * only alpha-numeric and underscores.
43 *
44 * The TRACE_SYSTEM_VAR is only used internally and not visible to
45 * user space.
46 */
47
48/*
49 * Notice that this file is not protected like a normal header.
50 * We also must allow for rereading of this file. The
51 *
52 *  || defined(TRACE_HEADER_MULTI_READ)
53 *
54 * serves this purpose.
55 */
56#if !defined(_SAMPLE_TRACE_ARRAY_H) || defined(TRACE_HEADER_MULTI_READ)
57#define _SAMPLE_TRACE_ARRAY_H
58
59#include <linux/tracepoint.h>
60TRACE_EVENT(sample_event,
61
62	TP_PROTO(int count, unsigned long time),
63
64	TP_ARGS(count, time),
65
66	TP_STRUCT__entry(
67		__field(int, count)
68		__field(unsigned long, time)
69	),
70
71	TP_fast_assign(
72		__entry->count = count;
73		__entry->time = time;
74	),
75
76	TP_printk("count value=%d at jiffies=%lu", __entry->count,
77		__entry->time)
78	);
79#endif
80
81#undef TRACE_INCLUDE_PATH
82#define TRACE_INCLUDE_PATH .
83#define TRACE_INCLUDE_FILE sample-trace-array
84#include <trace/define_trace.h>
85