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zdev: Add auto-config for PCI and crypto devices

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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>
This commit is contained in:
Peter Oberparleiter
2021-09-22 16:23:59 +02:00
committed by Jan Höppner
parent 8c6c2ef30e
commit 3949c62f6f
7 changed files with 104 additions and 6 deletions
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25
zdev/initramfs/scripts/init-top/s390-tools-zdev
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@@ -1,6 +1,6 @@
#!/bin/sh
#
# Copyright IBM Corp. 2017
# Copyright IBM Corp. 2017,2021
#
# s390-tools is free software; you can redistribute it and/or modify
# it under the terms of the MIT license. See LICENSE for details.
@@ -15,7 +15,9 @@
# where
#
# no-auto: Indicates that firmware-provided I/O configuration data
# should not be applied.
# should not be applied. This also affects automatic
# activation of PCI and crypto devices when running in a DPM
# LPAR.
#
PREREQ="udev"
@@ -36,6 +38,7 @@ esac
zdev_fw_file="/sys/firmware/sclp_sd/config/data"
zdev_base_args="--force --yes --no-root-update --no-settle --auto-conf --quiet"
zdev_id="/lib/s390-tools/zdev_id"
if [ -e "$zdev_fw_file" ] ; then
zdev_auto=1
@@ -64,4 +67,22 @@ if [ $zdev_auto -eq 1 ] ; then
udevadm trigger --type=subsystems --action=add
udevadm trigger --action=add
udevadm settle || true
# Get information about DPM environment
for line in $($zdev_id) ; do
eval "$line"
done
if [ "$ZDEV_IS_DPM,$ZDEV_NEST_LEVEL,$ZDEV_HYPERVISOR_0" = "1,1,LPAR" ] ; then
# Manually iterate over existing PCI devices - there is a udev
# rule that handles this for PCI devices added at runtime but
# that doesn't work for PCI devices defined before boot because
# there is no coldplug trigger for /sys/bus/pci/slots
for slot in /sys/bus/pci/slots/* ; do
read power < "$slot/power"
if [ "$power" = "0" ] ; then
echo 1 > "$slot/power"
fi
done
fi
fi