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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>
60 lines
1.6 KiB
Bash
60 lines
1.6 KiB
Bash
#!/bin/sh
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#
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# Copyright IBM Corp. 2016, 2017
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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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# hooks/s390-tools-zdev
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# This hook script adds files required to apply firmware-provided I/O
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# configuration data during boot.
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#
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# Needs to run after udev or resulting udev rules could be overwritten
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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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. /usr/share/initramfs-tools/hook-functions
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# Add modules for all device types supported by chzdev (required for
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# auto-configuration)
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zdev_modules="lcs qeth qeth_l2 qeth_l3 dasd_mod dasd_eckd_mod dasd_fba_mod dasd_diag_mod zfcp"
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for x in $zdev_modules ; do
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manual_add_modules ${x}
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done
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copy_exec /sbin/chzdev
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copy_exec /sbin/lszdev
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copy_exec /sbin/vmcp
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copy_exec /lib/s390-tools/zdev_id
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cp -p /usr/lib/udev/rules.d/81-dpm.rules "$DESTDIR/usr/lib/udev/rules.d/"
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_tempfile=$(mktemp --tmpdir initramfs-zdev.XXXXXX)
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# Obtain early + root device configuration
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chzdev --export "$_tempfile" --persistent --by-path / \
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--by-attrib "zdev:early=1" --quiet --type 2>/dev/null
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# Apply via --import to prevent other devices from being configured.
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# Rename the resulting cio-ignore rule to ensure that it does not override
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# the one copied by the initramfs udev hook to /lib/udev.
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chzdev --import "$_tempfile" --persistent \
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--base "/etc/udev/rules.d/41-cio-ignore.rules=$DESTDIR/etc/udev/rules.d/41-cio-ignore-root.rules" \
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--base "/etc=$DESTDIR/etc" --yes --quiet --no-root-update --force \
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>/dev/null
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rm -f "$_tempfile"
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