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89ed4249 DI |
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> | |
60 | TRACE_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> |