Linux kernel mirror (for testing)
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linux
1#!/bin/sh
2# Miscellaneous Intel PT testing
3# SPDX-License-Identifier: GPL-2.0
4
5set -e
6
7# Skip if no Intel PT
8perf list | grep -q 'intel_pt//' || exit 2
9
10skip_cnt=0
11ok_cnt=0
12err_cnt=0
13
14tmpfile=`mktemp`
15perfdatafile=`mktemp`
16
17can_cpu_wide()
18{
19 perf record -o ${tmpfile} -B -N --no-bpf-event -e dummy:u -C $1 true 2>&1 >/dev/null || return 2
20 return 0
21}
22
23test_system_wide_side_band()
24{
25 # Need CPU 0 and CPU 1
26 can_cpu_wide 0 || return $?
27 can_cpu_wide 1 || return $?
28
29 # Record on CPU 0 a task running on CPU 1
30 perf record -B -N --no-bpf-event -o ${perfdatafile} -e intel_pt//u -C 0 -- taskset --cpu-list 1 uname
31
32 # Should get MMAP events from CPU 1 because they can be needed to decode
33 mmap_cnt=`perf script -i ${perfdatafile} --no-itrace --show-mmap-events -C 1 2>/dev/null | grep MMAP | wc -l`
34
35 if [ ${mmap_cnt} -gt 0 ] ; then
36 return 0
37 fi
38
39 echo "Failed to record MMAP events on CPU 1 when tracing CPU 0"
40 return 1
41}
42
43count_result()
44{
45 if [ $1 -eq 2 ] ; then
46 skip_cnt=`expr ${skip_cnt} \+ 1`
47 return
48 fi
49 if [ $1 -eq 0 ] ; then
50 ok_cnt=`expr ${ok_cnt} \+ 1`
51 return
52 fi
53 err_cnt=`expr ${err_cnt} \+ 1`
54}
55
56test_system_wide_side_band
57
58count_result $?
59
60rm -f ${tmpfile}
61rm -f ${perfdatafile}
62
63if [ ${err_cnt} -gt 0 ] ; then
64 exit 1
65fi
66
67if [ ${ok_cnt} -gt 0 ] ; then
68 exit 0
69fi
70
71exit 2