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https://github.com/ibm-s390-linux/s390-tools.git
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9927023680
Add parsing of dracut cmdline option "rd.dasd=..." at initrd runtime. It delegates configuration to chzdev. Implement `dracut --print-cmdline` and `dracut --hostonly-cmdline` for initrd build time. Emit an rd.dasd option for each DASD disk in dracut's device dependency graph (to mount the root-fs, or to access the kdump target). This allows a distribution independent device configuration. Configuration is consistent by using chzdev as backend. It also prevents duplicate activations of the same device. Copy the udev rule for unique DASD device nodes under /dev/disk/ [59-dasd.rules] into initrd for the same functionality like 95dasd or 95dasd_rules. Along with the existing functionality of zdev/dracut, it makes the following dracut modules superfluous: https://github.com/dracutdevs/dracut/tree/master/modules.d/95dasd https://github.com/dracutdevs/dracut/tree/master/modules.d/95dasd_mod https://github.com/dracutdevs/dracut/tree/master/modules.d/95dasd_rules Github-ID: https://github.com/ibm-s390-linux/s390-tools/pull/158 Acked-by: Vineeth Vijayan <vneethv@linux.ibm.com> Acked-by: Peter Oberparleiter <oberpar@linux.ibm.com> Signed-off-by: Steffen Maier <maier@linux.ibm.com> Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
111 lines
4.2 KiB
Bash
111 lines
4.2 KiB
Bash
#
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# Copyright IBM Corp. 2023
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#
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# s390-tools is free software; you can redistribute it and/or modify
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# it under the terms of the MIT license. See LICENSE for details.
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#
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#
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# 95zdev/zdev-lib.sh
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# Common shell library functionality for 95zdev and 95zdev-kdump.
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#
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# shellcheck shell=bash
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zdev_is_kdump() {
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# https://src.fedoraproject.org/rpms/kexec-tools/c/4eedcae5e1540690a3761857fe2e692774c44960
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# https://src.fedoraproject.org/rpms/kexec-tools/blob/rawhide/f/mkdumprd
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# https://src.fedoraproject.org/rpms/kexec-tools/blob/rawhide/f/dracut-module-setup.sh
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# shellcheck disable=SC2154
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if [[ $hostonly && "$hostonly_mode" == "strict" && -n "$IN_KDUMP" ]]; then
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return 0
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fi
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# https://github.com/openSUSE/kdump/blob/master/dracut/module-setup.sh
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# shellcheck disable=SC2154
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if [[ " $dracutmodules $add_dracutmodules $force_add_dracutmodules " == *\ kdump\ * ]]; then
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return 0
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fi
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return 1
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}
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zdev_zfcp_auto_lun_scan_active() {
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local _fcpdevsysfs=$1
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local _porttype _lunscan
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read -r _porttype < "$_fcpdevsysfs"/host*/fc_host/host*/port_type
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read -r _lunscan < /sys/module/zfcp/parameters/allow_lun_scan
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if [[ "$_porttype" == "NPIV VPORT" && "$_lunscan" == "Y" ]]; then
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return 0
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fi
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return 1
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}
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# zdev_check_dev() can be extended for other device types such as PCIe
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zdev_check_dev() {
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local _dev=$1
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local _devsysfs _devtype _subsystem _driver
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local _intlun _fcplun _scsitarget _wwpn _hbaid
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local _busid _arg
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_devsysfs=$(
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cd -P /sys/dev/block/"$_dev" 2> /dev/null && echo "$PWD"
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)
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# This is roughly what systemd's udev-builtin-path_id does:
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while [[ -n "$_devsysfs" ]]; do
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# ascend to parent: strip last path part
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_devsysfs=${_devsysfs%/*}
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_subsystem=$(
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cd -P "$_devsysfs"/subsystem 2> /dev/null && echo "$PWD"
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)
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if [[ "${_subsystem##*/}" == "scsi" ]]; then
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_devtype=$(grep "^DEVTYPE=" "$_devsysfs"/uevent)
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# check for FCP LUN
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if [[ "$_devtype" == "DEVTYPE=scsi_device" ]]; then
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_intlun=${_devsysfs##*:}
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# convert _intlun to _fcplun [int_to_scsilun()]
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_fcplun=0
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((_fcplun |= (_intlun & 0x000000000000ffff) << 48))
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((_fcplun |= (_intlun & 0x00000000ffff0000) << 16))
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((_fcplun |= (_intlun & 0x0000ffff00000000) >> 16))
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((_fcplun |= (_intlun & 0xffff000000000000) >> 48))
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printf -v _fcplun "0x%016x" "$_fcplun"
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# bail out if not scsi_transport_fc
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[[ "${_devsysfs/*rport-*/FOUND}" == "FOUND" ]] || return 0
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continue
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fi
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# check for target WWPN
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if [[ "$_devtype" == "DEVTYPE=scsi_target" ]]; then
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_scsitarget=${_devsysfs##*/}
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read -r _wwpn < "$_devsysfs/fc_transport/$_scsitarget/port_name"
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continue
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fi
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fi
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if [[ "${_subsystem##*/}" == "ccw" ]]; then
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_driver=$(
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cd -P "$_devsysfs"/driver 2> /dev/null && echo "$PWD"
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)
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# check for FCP device (vHBA) bus-ID
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if [[ "${_driver##*/}" == "zfcp" ]]; then
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_hbaid=${_devsysfs##*/}
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# drop full path and use zfcp auto LUN scan, if:
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# - not building for kdump which has zfcp auto LUN scan off
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# - and zfcp auto LUN scan is available
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if ! zdev_is_kdump && \
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zdev_zfcp_auto_lun_scan_active "$_devsysfs"; then
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unset _wwpn
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unset _fcplun
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fi
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if [[ -n "$_wwpn" ]] && [[ -n "$_fcplun" ]]; then
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printf " rd.zfcp=%s,%s,%s\n" "$_hbaid" "$_wwpn" "$_fcplun"
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else
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printf " rd.zfcp=%s\n" "$_hbaid"
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fi
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break
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fi
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# check for DASD device bus-ID
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if [[ "${_driver##*/}" == dasd-* ]]; then
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_busid=${_devsysfs##*/}
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_arg=$(/lib/s390-tools/zdev-to-dasd_mod.dasd "active" "$_busid")
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printf " rd.dasd=%s\n" "$_arg"
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break
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fi
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fi
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done
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}
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