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
72