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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>
66 lines
1.9 KiB
Bash
66 lines
1.9 KiB
Bash
#!/bin/bash
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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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#
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# 95zdev/module_setup.sh
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# This module installs configuration files (udev rules and modprobe.conf
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# files) required to enable the root device on s390. It will only work when
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# the root device was configured using the chzdev tool. In addition,
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# a hook is installed to parse rd.zdev= kernel parameters.
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#
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check() {
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local _arch=$(uname -m)
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# Ensure that we're running on s390
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[ "$_arch" = "s390" -o "$_arch" = "s390x" ] || return 1
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# Ensure that required tools are available
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require_binaries chzdev lszdev /lib/s390-tools/zdev_id || return 1
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return 0
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}
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depends() {
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return 0
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}
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installkernel() {
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# Add modules for all device types supported by chzdev (required for
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# auto-configuration)
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instmods ctcm lcs qeth qeth_l2 qeth_l3 dasd_mod dasd_eckd_mod dasd_fba_mod \
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dasd_diag_mod zfcp
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}
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install() {
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local _tempfile
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# Ensure that required tools are available
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inst_multiple chzdev lszdev vmcp /lib/s390-tools/zdev_id
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# Hook to parse zdev kernel parameter
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inst_hook cmdline 95 "$moddir/parse-zdev.sh"
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# Rule to automatically enable devices when running in DPM
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inst_rules "81-dpm.rules"
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# Obtain early + root device configuration
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_tempfile=$(mktemp --tmpdir dracut-zdev.XXXXXX)
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chzdev --export "$_tempfile" --persistent --by-path / --quiet \
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--type 2>/dev/null
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chzdev --export - --persistent --by-attrib "zdev:early=1" --quiet \
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--type 2>/dev/null >> "$_tempfile"
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# Apply via --import to prevent other devices from being configured
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chzdev --import "$_tempfile" --persistent --base "/etc=$initdir/etc" \
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--yes --quiet --no-root-update --force >/dev/null
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rm -f "$_tempfile"
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return 0
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}
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