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#!/bin/bash # SPDX-License-Identifier: GPL-2.0 SYSFS= # Kselftest framework requirement - SKIP code is 4. ksft_skip=4 prerequisite() { msg="skip all tests:" if [ $UID != 0 ]; then echo $msg must be run as root >&2 exit $ksft_skip fi taskset -p 01 $$ SYSFS=`mount -t sysfs \| head -1 \| awk '{ print $3 }'` if [ ! -d "$SYSFS" ]; then echo $msg sysfs is not mounted >&2 exit $ksft_skip fi if ! ls $SYSFS/devices/system/cpu/cpu* > /dev/null 2>&1; then echo $msg cpu hotplug is not supported >&2 exit $ksft_skip fi echo "CPU online/offline summary:" online_cpus=`cat $SYSFS/devices/system/cpu/online` online_max=${online_cpus##-} if [[ "$online_cpus" = "$online_max" ]]; then echo "$msg: since there is only one cpu: $online_cpus" exit $ksft_skip fi present_cpus=`cat $SYSFS/devices/system/cpu/present` present_max=${present_cpus##-} echo "present_cpus = $present_cpus present_max = $present_max" echo -e "\t Cpus in online state: $online_cpus" offline_cpus=`cat $SYSFS/devices/system/cpu/offline` if [[ "a$offline_cpus" = "a" ]]; then offline_cpus=0 else offline_max=${offline_cpus##-} fi echo -e "\t Cpus in offline state: $offline_cpus" } # # list all hot-pluggable CPUs # hotpluggable_cpus() { local state=${1:-.\} for cpu in $SYSFS/devices/system/cpu/cpu; do if [ -f $cpu/online ] && grep -q $state $cpu/online; then echo ${cpu##//cpu} fi done } hotplaggable_offline_cpus() { hotpluggable_cpus 0 } hotpluggable_online_cpus() { hotpluggable_cpus 1 } cpu_is_online() { grep -q 1 $SYSFS/devices/system/cpu/cpu$1/online } cpu_is_offline() { grep -q 0 $SYSFS/devices/system/cpu/cpu$1/online } online_cpu() { echo 1 > $SYSFS/devices/system/cpu/cpu$1/online } offline_cpu() { echo 0 > $SYSFS/devices/system/cpu/cpu$1/online } online_cpu_expect_success() { local cpu=$1 if ! online_cpu $cpu; then echo $FUNCNAME $cpu: unexpected fail >&2 exit 1 elif ! cpu_is_online $cpu; then echo $FUNCNAME $cpu: unexpected offline >&2 exit 1 fi } online_cpu_expect_fail() { local cpu=$1 if online_cpu $cpu 2> /dev/null; then echo $FUNCNAME $cpu: unexpected success >&2 exit 1 elif ! cpu_is_offline $cpu; then echo $FUNCNAME $cpu: unexpected online >&2 exit 1 fi } offline_cpu_expect_success() { local cpu=$1 if ! offline_cpu $cpu; then echo $FUNCNAME $cpu: unexpected fail >&2 exit 1 elif ! cpu_is_offline $cpu; then echo $FUNCNAME $cpu: unexpected offline >&2 exit 1 fi } offline_cpu_expect_fail() { local cpu=$1 if offline_cpu $cpu 2> /dev/null; then echo $FUNCNAME $cpu: unexpected success >&2 exit 1 elif ! cpu_is_online $cpu; then echo $FUNCNAME $cpu: unexpected offline >&2 exit 1 fi } error=-12 allcpus=0 priority=0 online_cpus=0 online_max=0 offline_cpus=0 offline_max=0 present_cpus=0 present_max=0 while getopts e:ahp: opt; do case $opt in e) error=$OPTARG ;; a) allcpus=1 ;; h) echo "Usage $0 [ -a ] [ -e errno ] [ -p notifier-priority ]" echo -e "\t default offline one cpu" echo -e "\t run with -a option to offline all cpus" exit ;; p) priority=$OPTARG ;; esac done if ! [ "$error" -ge -4095 -a "$error" -lt 0 ]; then echo "error code must be -4095 <= errno < 0" >&2 exit 1 fi prerequisite # # Safe test (default) - offline and online one cpu # if [ $allcpus -eq 0 ]; then echo "Limited scope test: one hotplug cpu" echo -e "\t (leaves cpu in the original state):" echo -e "\t online to offline to online: cpu $online_max" offline_cpu_expect_success $online_max online_cpu_expect_success $online_max if [[ $offline_cpus -gt 0 ]]; then echo -e "\t offline to online to offline: cpu $present_max" online_cpu_expect_success $present_max offline_cpu_expect_success $present_max online_cpu $present_max fi exit 0 else echo "Full scope test: all hotplug cpus" echo -e "\t online all offline cpus" echo -e "\t offline all online cpus" echo -e "\t online all offline cpus" fi # # Online all hot-pluggable CPUs # for cpu in `hotplaggable_offline_cpus`; do online_cpu_expect_success $cpu done # # Offline all hot-pluggable CPUs # for cpu in `hotpluggable_online_cpus`; do offline_cpu_expect_success $cpu done # # Online all hot-pluggable CPUs again # for cpu in `hotplaggable_offline_cpus`; do online_cpu_expect_success $cpu done # # Test with cpu notifier error injection # DEBUGFS=`mount -t debugfs \| head -1 \| awk '{ print $3 }'` NOTIFIER_ERR_INJECT_DIR=$DEBUGFS/notifier-error-inject/cpu prerequisite_extra() { msg="skip extra tests:" /sbin/modprobe -q -r cpu-notifier-error-inject /sbin/modprobe -q cpu-notifier-error-inject priority=$priority if [ ! -d "$DEBUGFS" ]; then echo $msg debugfs is not mounted >&2 exit $ksft_skip fi if [ ! -d $NOTIFIER_ERR_INJECT_DIR ]; then echo $msg cpu-notifier-error-inject module is not available >&2 exit $ksft_skip fi } prerequisite_extra # # Offline all hot-pluggable CPUs # echo 0 > $NOTIFIER_ERR_INJECT_DIR/actions/CPU_DOWN_PREPARE/error for cpu in `hotpluggable_online_cpus`; do offline_cpu_expect_success $cpu done # # Test CPU hot-add error handling (offline => online) # echo $error > $NOTIFIER_ERR_INJECT_DIR/actions/CPU_UP_PREPARE/error for cpu in `hotplaggable_offline_cpus`; do online_cpu_expect_fail $cpu done # # Online all hot-pluggable CPUs # echo 0 > $NOTIFIER_ERR_INJECT_DIR/actions/CPU_UP_PREPARE/error for cpu in `hotplaggable_offline_cpus`; do online_cpu_expect_success $cpu done # # Test CPU hot-remove error handling (online => offline) # echo $error > $NOTIFIER_ERR_INJECT_DIR/actions/CPU_DOWN_PREPARE/error for cpu in `hotpluggable_online_cpus`; do offline_cpu_expect_fail $cpu done echo 0 > $NOTIFIER_ERR_INJECT_DIR/actions/CPU_DOWN_PREPARE/error /sbin/modprobe -q -r cpu-notifier-error-inject

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