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> |
85 | |