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#!/bin/bash
##
# This script is to handle fan fail condition which is described below.
# Fan fail means one fan RPM is under its CriticalLow. If BMC encounters
# such situation, then sets other fans to full speed.
#
# get fan state
function get_fan_state() {
get_property_path='xyz.openbmc_project.Sensor.Threshold.Critical CriticalAlarmLow'
fan_state="$(busctl get-property $1 $2 $get_property_path | awk '{print $2}')"
echo "$fan_state"
}
# check fan fail
function is_fan_fail() {
fan_state=("$@")
for i in "${fan_state[@]}"
do
if [ ! -z "$i" ]
then
if [ $i == "true" ]
then
echo 1
return
fi
fi
done
echo 0
}
fan_tach_path=( '/xyz/openbmc_project/sensors/fan_tach/fan0'
'/xyz/openbmc_project/sensors/fan_tach/fan1'
'/xyz/openbmc_project/sensors/fan_tach/fb_fan0'
'/xyz/openbmc_project/sensors/fan_tach/fb_fan1'
'/xyz/openbmc_project/sensors/fan_tach/fb_fan2'
)
check_fail_flag=0
is_fan_fail_flag=0
current_fan_state=()
while true
do
for i in ${!fan_tach_path[@]}
do
mapper wait ${fan_tach_path[$i]}
hwmon_path="$(mapper get-service ${fan_tach_path[0]})"
current_fan_state[$i]=$(get_fan_state $hwmon_path ${fan_tach_path[$i]})
done
is_fan_fail_flag=$(is_fan_fail "${current_fan_state[@]}")
# if fan fails then set all fans to full speed
if [ $is_fan_fail_flag -eq 1 ] && [ $check_fail_flag -eq 0 ]
then
check_fail_flag=1
systemctl stop phosphor-pid-control.service
# fans recover to normal state
elif [ $is_fan_fail_flag -eq 0 ] && [ $check_fail_flag -eq 1 ]
then
check_fail_flag=0
systemctl restart phosphor-pid-control.service
fi
sleep 2
done
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