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#!/bin/sh
# SPDX-License-Identifier: GPL-2.0
# description: Test trace remote read with an offline CPU
# requires: remotes/test
. $TEST_DIR/remotes/functions
hotunplug_one_cpu()
{
[ "$(get_cpu_ids | wc -l)" -ge 2 ] || return 1
for cpu in $(get_cpu_ids); do
echo 0 > /sys/devices/system/cpu/cpu$cpu/online || return 1
break
done
echo $cpu
}
# Check non-consuming and consuming read
check_read()
{
for i in $(seq 1 8); do
echo $i > write_event
done
check_trace 1 8 trace
output=$(dump_trace_pipe)
check_trace 1 8 $output
rm $output
}
test_hotplug()
{
echo 0 > trace
assert_loaded
#
# Test a trace buffer containing an offline CPU
#
cpu=$(hotunplug_one_cpu) || exit_unsupported
trap "echo 1 > /sys/devices/system/cpu/cpu$cpu/online" EXIT
check_read
#
# Test a trace buffer with a missing CPU
#
reload_remote
check_read
#
# Test a trace buffer with a CPU added later
#
echo 1 > /sys/devices/system/cpu/cpu$cpu/online
trap "" EXIT
assert_loaded
check_read
# Test if the ring-buffer for the newly added CPU is both writable and
# readable
for i in $(seq 1 8); do
taskset -c $cpu echo $i > write_event
done
cd per_cpu/cpu$cpu/
check_trace 1 8 trace
output=$(dump_trace_pipe)
check_trace 1 8 $output
rm $output
cd -
}
if [ -z "$SOURCE_REMOTE_TEST" ]; then
set -e
setup_remote_test
test_hotplug
fi
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