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#!/bin/bash
#
# Copyright IBM Corp. 2016, 2023
#
# 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/module_setup.sh
# This module installs configuration files (udev rules and modprobe.conf
# files) required to enable the root device on s390. It will only work when
# the root device was configured using the chzdev tool. In addition,
# hooks are installed to parse rd.zdev= and rd.zfcp= and rd.dasd=
# kernel parameters.
#
# called by dracut
check() {
local _arch
_arch=$(uname -m)
# Ensure that we're running on s390
[ "$_arch" = "s390" ] || [ "$_arch" = "s390x" ] || return 1
# shellcheck source=/dev/null
source "${moddir:?}/zdev-lib.sh"
# Leave kdump device configuration to module zdev-kdump to
# ensure a minimal device footprint
zdev_is_kdump && return 1
# Ensure that required tools are available
require_binaries chzdev lszdev /lib/s390-tools/zdev_id || return 1
require_binaries sed || return 1
require_binaries grep sort uniq || return 1
return 0
}
# called by dracut
depends() {
return 0
}
# called by dracut and (conditionally) locally by install()
# Generate rd.zfcp dracut cmdline options for each zfcp-attached
# SCSI disk in dracut's device dependency graph (to mount the root-fs,
# or to access the kdump target). With "dracut --print-cmdline", dracut
# prints the list. With "dracut --hostonly-cmdline" [the case where
# install() calls cmdline()], dracut stores the list inside the generated
# initrd.
cmdline() {
# shellcheck disable=SC2154
if [[ $hostonly ]]; then
for_each_host_dev_and_slaves_all zdev_check_dev | sort | uniq
fi
}
# called by dracut
installkernel() {
# Add modules for all device types supported by chzdev (required for
# auto-configuration)
hostonly="$(optional_hostonly)" \
instmods ctcm lcs qeth qeth_l2 qeth_l3 dasd_mod dasd_eckd_mod dasd_fba_mod \
dasd_diag_mod zfcp
}
# called by dracut
install() {
local _tempfile
# Ensure that required tools are available
inst_multiple chzdev lszdev vmcp /lib/s390-tools/zdev_id
inst_multiple grep
# Hook to parse zdev kernel parameter
inst_hook cmdline 95 "$moddir/parse-zdev.sh"
# Hook to parse zfcp dracut cmdline parameter
inst_hook cmdline 95 "$moddir/parse-zfcp.sh"
# Hook to parse dasd dracut cmdline parameter
# Must be the first one to use chzdev so dasd_mod is not yet loaded.
inst_hook cmdline 94 "$moddir/parse-dasd.sh"
inst_multiple /lib/s390-tools/zdev-from-dasd_mod.dasd
inst_hook pre-pivot 95 "$moddir/retain-zdev.sh"
# Rule to automatically enable devices when running in DPM
inst_rules "81-dpm.rules"
inst_rules "59-dasd.rules"
# Obtain early + root device configuration
# shellcheck disable=SC2154
if [[ $hostonly_cmdline == "yes" ]]; then
local _rdsomedev
for _rdsomedev in $(cmdline); do
printf "%s\n" "$_rdsomedev" >> "${initdir:?}/etc/cmdline.d/94zdev.conf"
done
fi
# If enabled, add the host-specific config of required devices into initrd
# shellcheck disable=SC2154
[[ $hostonly ]] || return 0
_tempfile=$(mktemp --tmpdir="${DRACUT_TMPDIR}" dracut-zdev.XXXXXX)
function check_zdev() {
local _dev=$1
local _devsysfs _bdevpath
_devsysfs=$(
cd -P /sys/dev/block/"$_dev" && echo "$PWD"
)
_bdevpath=/dev/${_devsysfs##*/}
chzdev --export - --active --by-node "$_bdevpath" --quiet \
2>/dev/null >> "$_tempfile"
#--type # needs a change in chzdev to not have subsequent
# import bail out on unknown type properties
}
for_each_host_dev_and_slaves_all check_zdev
sed -i -e 's/^\[active /\[persistent /' "$_tempfile"
chzdev --export - --persistent --by-attrib "zdev:early=1" --quiet \
--type 2>/dev/null >> "$_tempfile"
# Obtain early device configuration for site-specific settings
for (( site=0; site<10; site++ ))
do
chzdev --export - --persistent --by-attrib "zdev:early=1" --site $site \
--quiet 2>/dev/null >> "$_tempfile"
done
ddebug < "$_tempfile"
# Apply via --import to prevent other devices from being configured
chzdev --import "$_tempfile" --persistent --base "/etc=${initdir:?}/etc" \
--yes --no-root-update --force 2>&1 | ddebug
# Apply site-specific configurations via --import
for (( site=0; site<10; site++ ))
do
chzdev --import "$_tempfile" --persistent --base "/etc=$initdir/etc" \
--site $site --yes --no-root-update --force 2>&1 | ddebug
done
lszdev --configured --persistent --info \
--base "/etc=$initdir/etc" 2>&1 | ddebug
rm -f "$_tempfile"
# these are purely generated udev rules so we have to glob expand
# within $initdir and strip the $initdir prefix for mark_hostonly
local -a _array
local _nullglob
_nullglob=$(shopt -p nullglob)
shopt -u nullglob
readarray -t _array < \
<(ls -1 "$initdir"/etc/udev/rules.d/41-*.rules 2> /dev/null)
[[ ${#_array[@]} -gt 0 ]] && mark_hostonly "${_array[@]#$initdir}"
readarray -t _array < \
<(ls -1 "$initdir"/etc/modprobe.d/s390x-*.conf 2> /dev/null)
[[ ${#_array[@]} -gt 0 ]] && mark_hostonly "${_array[@]#$initdir}"
$_nullglob
return 0
}
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