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3949c62f6f
PCI and crypto devices defined using the IBM Z Dynamic Partition Manager (DPM) will start in an offline/unconfigured state that requires manual intervention before the associated Linux function can be used. This results for example in PCI networking interfaces being unavailable in a distribution installer system. Fix this by providing a udev rule and initial RAM-disk logic that automatically enables PCI and crypto devices either during boot, or when they are defined at run-time. This processing can be suppressed by specifying the "rd.zdev=no-auto" parameter on the kernel command line. Auto-configuration is limited to Linux running in DPM LPARs because PCI-functions and crypto devices defined by DPM are always intended for use by a single LPAR only. For Linux running in classic-mode LPARs or virtual machines, leaving PCI and crypto devices in an offline state may be useful to allow defining a device as available to multiple systems, where only the system that intends to make use of the device should enable it. Signed-off-by: Peter Oberparleiter <oberpar@linux.ibm.com> Reviewed-by: Jan Höppner <hoeppner@linux.ibm.com> Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
89 lines
2.0 KiB
Bash
89 lines
2.0 KiB
Bash
#!/bin/sh
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#
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# Copyright IBM Corp. 2017,2021
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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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# scripts/init-top/s390-tools-zdev
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# Parse the kernel command line for rd.zdev kernel parameters. These
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# parameters are evaluated and used to configure z Systems specific devices.
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#
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# Format:
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# rd.zdev=no-auto
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#
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# where
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#
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# no-auto: Indicates that firmware-provided I/O configuration data
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# should not be applied. This also affects automatic
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# activation of PCI and crypto devices when running in a DPM
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# LPAR.
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#
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PREREQ="udev"
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prereqs()
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{
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echo "$PREREQ"
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}
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case $1 in
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prereqs)
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prereqs
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exit 0
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;;
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esac
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. /scripts/functions
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zdev_fw_file="/sys/firmware/sclp_sd/config/data"
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zdev_base_args="--force --yes --no-root-update --no-settle --auto-conf --quiet"
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zdev_id="/lib/s390-tools/zdev_id"
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if [ -e "$zdev_fw_file" ] ; then
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zdev_auto=1
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else
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zdev_auto=0
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fi
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for x in $(cat /proc/cmdline); do
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case ${x} in
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rd.zdev=*)
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zdev_arg=${x#*=}
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if [ "$zdev_arg" = "no-auto" ] ; then
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zdev_auto=0
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fi
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;;
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esac
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done
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if [ $zdev_auto -eq 1 ] ; then
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log_begin_msg "Starting firmware auto-configuration"
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chzdev --import "$zdev_fw_file" $zdev_base_args
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log_end_msg
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# Repeat cold-plug after creating udev rules
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udevadm control --reload
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udevadm trigger --type=subsystems --action=add
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udevadm trigger --action=add
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udevadm settle || true
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# Get information about DPM environment
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for line in $($zdev_id) ; do
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eval "$line"
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done
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if [ "$ZDEV_IS_DPM,$ZDEV_NEST_LEVEL,$ZDEV_HYPERVISOR_0" = "1,1,LPAR" ] ; then
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# Manually iterate over existing PCI devices - there is a udev
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# rule that handles this for PCI devices added at runtime but
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# that doesn't work for PCI devices defined before boot because
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# there is no coldplug trigger for /sys/bus/pci/slots
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for slot in /sys/bus/pci/slots/* ; do
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read power < "$slot/power"
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if [ "$power" = "0" ] ; then
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echo 1 > "$slot/power"
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fi
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done
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fi
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fi
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