1#!/bin/sh
2# SPDX-License-Identifier: GPL-2.0
3# description: Basic tests on writing to trace_marker
4# requires: trace_marker
5# flags: instance
6
7get_buffer_data_size() {
8	sed -ne 's/^.*data.*size:\([0-9][0-9]*\).*/\1/p' events/header_page
9}
10
11get_buffer_data_offset() {
12	sed -ne 's/^.*data.*offset:\([0-9][0-9]*\).*/\1/p' events/header_page
13}
14
15get_event_header_size() {
16	type_len=`sed -ne 's/^.*type_len.*:[^0-9]*\([0-9][0-9]*\).*/\1/p' events/header_event`
17	time_len=`sed -ne 's/^.*time_delta.*:[^0-9]*\([0-9][0-9]*\).*/\1/p' events/header_event`
18	array_len=`sed -ne 's/^.*array.*:[^0-9]*\([0-9][0-9]*\).*/\1/p' events/header_event`
19	total_bits=$((type_len+time_len+array_len))
20	total_bits=$((total_bits+7))
21	echo $((total_bits/8))
22}
23
24get_print_event_buf_offset() {
25	sed -ne 's/^.*buf.*offset:\([0-9][0-9]*\).*/\1/p' events/ftrace/print/format
26}
27
28event_header_size=`get_event_header_size`
29print_header_size=`get_print_event_buf_offset`
30
31data_offset=`get_buffer_data_offset`
32
33marker_meta=$((event_header_size+print_header_size))
34
35make_str() {
36        cnt=$1
37	# subtract two for \n\0 as marker adds these
38	cnt=$((cnt-2))
39	printf -- 'X%.0s' $(seq $cnt)
40}
41
42write_buffer() {
43	size=$1
44
45	str=`make_str $size`
46
47	# clear the buffer
48	echo > trace
49
50	# write the string into the marker
51	echo -n $str > trace_marker
52
53	echo $str
54}
55
56test_buffer() {
57
58	size=`get_buffer_data_size`
59	oneline_size=$((size-marker_meta))
60	echo size = $size
61	echo meta size = $marker_meta
62
63	# Now add a little more the meta data overhead will overflow
64
65	str=`write_buffer $size`
66
67	# Make sure the line was broken
68	new_str=`awk ' /tracing_mark_write:/ { sub(/^.*tracing_mark_write: /,"");printf "%s", $0; exit}' trace`
69
70	if [ "$new_str" = "$str" ]; then
71		exit fail;
72	fi
73
74	# Make sure the entire line can be found
75	new_str=`awk ' /tracing_mark_write:/ { sub(/^.*tracing_mark_write: /,"");printf "%s", $0; }' trace`
76
77	if [ "$new_str" != "$str" ]; then
78		exit fail;
79	fi
80}
81
82test_buffer
83