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#!/bin/sh
#
# Copyright IBM Corp. 2017,2021
#
# s390-tools is free software; you can redistribute it and/or modify
# it under the terms of the MIT license. See LICENSE for details.
#
# 95zdev/parse-zdev.sh
# Parse the kernel command line for rd.zdev kernel parameters. These
# parameters are evaluated and used to configure z Systems specific devices.
#
# Format:
# rd.zdev=no-auto
#
# where
#
# no-auto: Indicates that firmware-provided I/O configuration data
# should not be applied. This also affects automatic
# activation of PCI and crypto devices when running in a DPM
# LPAR.
#
zdev_fw_file="/sys/firmware/sclp_sd/config/data"
zdev_base_args="--force --yes --no-root-update --no-settle --auto-conf --quiet"
zdev_id="/lib/s390-tools/zdev_id"
if [ -e "$zdev_fw_file" ] ; then
zdev_auto=1
else
zdev_auto=0
fi
for zdev_arg in $(getargs rd.zdev); do
if [ "$zdev_arg" = "no-auto" ] ; then
zdev_auto=0
fi
done
if [ $zdev_auto -eq 1 ] ; then
# shellcheck disable=SC2086
chzdev --import "$zdev_fw_file" $zdev_base_args
# Get information about DPM environment
for line in $($zdev_id) ; do
eval "$line"
done
if [ "$ZDEV_IS_DPM,$ZDEV_NEST_LEVEL,$ZDEV_HYPERVISOR_0" = "1,1,LPAR" ] ; then
# Manually iterate over existing PCI devices - there is a udev rule
# that handles this for PCI devices added at runtime but that doesn't
# work for PCI devices defined before boot because there is no coldplug
# trigger for /sys/bus/pci/slots
for slot in /sys/bus/pci/slots/* ; do
read -r power < "$slot/power"
if [ "$power" = "0" ] ; then
echo 1 > "$slot/power"
fi
done
fi
fi
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