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82b9328e48
While parsing the rd.dasd kernel parameter, the dracut module currently creates two separate udev rules for a single DASD — one for ECKD type and one for FBA type. Because the kernel parameter alone does not provide enough information to reliably determine the DASD type, this dual configuration can lead to inconsistencies. Update the logic to determine the DASD type dynamically by parsing the modalias of available devices. If a device is not present during boot, both udev rules will be generated. Also add --no-module-load to the chzdev functions, because during this time, we do not want chzdev to load the dasd module. The goal here is to generate the right udev-rules only. Suggested-by: Peter Oberparleiter <oberpar@linux.ibm.com> Signed-off-by: Vineeth Vijayan <vneethv@linux.ibm.com> Reviewed-by: Peter Oberparleiter <oberpar@linux.ibm.com> Signed-off-by: Steffen Eiden <seiden@linux.ibm.com>
123 lines
5.9 KiB
Plaintext
123 lines
5.9 KiB
Plaintext
#
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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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# zdev-from-dasd_mod.dasd
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# Shell library, which can be sourced by other POSIX compatible shell scripts.
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# Provide helper function parsing its stdin based on the syntax of kernel
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# device driver parameter dasd_mod.dasd= and invoking chzdev to produce
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# corresponding persistent device configurations. The helper function
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# takes one argument, which is either "globals" or "ranges". For a
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# complete configuration, call the function twice, first with "globals"
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# and then with "ranges".
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#
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# shellcheck shell=sh
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# It would be possible to pass the collected rd.dasd options via
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# modprobe.d. However, it is still required to parse the options to handle
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# cio_ignore. That in turn ensures devices get sensed. Sensing is in turn
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# required for automatically loading the device drivers via modalias and
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# for the dasd device driver to find devices it can probe (set online). So
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# go all the way and parse the rd.dasd options. For device bus-IDs, use
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# chzdev, which not only handles cio_ignore transparently, but also
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# generates persistent configuration that can be transferred from initrd to
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# another root files system such as in a distro installer environment.
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zdev_dasd_base_args="--no-settle --yes --no-root-update --no-module-load --quiet"
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zdev_parse_dasd_list() {
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sed 's/,/\n/g' | while read -r _zdev_dasditem; do
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unset _zdev_dasd_range _zdev_dasd_features _zdev_dasd_attrs
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case $_zdev_dasditem in
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autodetect|probeonly|nopav|nofcx)
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[ "$1" = "globals" ] || continue
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# Autodetect can of course only enable devices that are not
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# in the cio_ignore list.
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# Intentionally do not dynamically configure now, but only
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# generate a modprobe.d file, which configures the device
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# later during kernel module load.
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echo "rd.dasd ...,${_zdev_dasditem},... :"
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# shellcheck disable=SC2086
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chzdev dasd --type "${_zdev_dasditem}=1" --persistent \
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$zdev_dasd_base_args --force
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;;
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"") continue ;; # empty range
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*) # currently no support for a device-spec "ipldev", only devbusid
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[ "$1" = "ranges" ] || continue
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SAVED_IFS="$IFS"
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IFS='('
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read -r _zdev_dasd_range _zdev_dasd_features <<EOF
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$_zdev_dasditem
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EOF
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IFS="$SAVED_IFS"
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if [ "${_zdev_dasd_features%%*)}" != "" ]; then
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warn "rd.dasd: Missing closing parenthesis at features of DASD range $_zdev_dasd_range: ($_zdev_dasd_features"
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fi
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if [ -n "$_zdev_dasd_features" ]; then
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_zdev_dasd_features="${_zdev_dasd_features%)}"
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_zdev_dasd_features=$(echo "$_zdev_dasd_features" | sed 's/:/\n/g')
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while read -r _zdev_dasd_feature; do
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case $_zdev_dasd_feature in
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ro) _zdev_dasd_attrs="$_zdev_dasd_attrs readonly=1" ;;
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diag) _zdev_dasd_attrs="$_zdev_dasd_attrs use_diag=1" ;;
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raw) _zdev_dasd_attrs="$_zdev_dasd_attrs raw_track_access=1" ;;
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erplog|failfast) _zdev_dasd_attrs="$_zdev_dasd_attrs ${_zdev_dasd_feature}=1" ;;
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*)
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warn "rd.dasd: Unknown DASD feature for device range $_zdev_dasd_range: $_zdev_dasd_feature"
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;;
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esac
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done <<EOF
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$_zdev_dasd_features
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EOF
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fi
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# Without dynamic (active) config zdev cannot infer
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# the actual dasd type (eckd, fba). Add logic to generate the
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# udev rules based on the availability of modalias entry.
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echo "rd.dasd ...,${_zdev_dasditem},... :"
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# free the dev-ids from blacklist to analyse the modalias
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echo "free $_zdev_dasd_range" > /proc/cio_ignore
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echo 1 > /proc/cio_settle
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# Now, Configure both DASD types. While doing so, ensure that
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# module loading is suppressed and that the --force option
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# is not used with chzdev.
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# As a result:
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# - For non-existent devices, udev rules are generated for
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# both DASD types.
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# - For existing devices identified as generic-ccw, chzdev
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# skips generating udev rules.
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for dasd_type in dasd-eckd dasd-fba; do
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chzdev "$dasd_type" --enable --persistent "$_zdev_dasd_range" \
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$_zdev_dasd_attrs $zdev_dasd_base_args 2>/dev/null \
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| sed -e 's/^/Non-existent /g'
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done
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# For the existing devices, configure the right dasd-type based
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# on modalias
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lszdev "$_zdev_dasd_range" --active --no-headings --columns \
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ID,attr:modalias | \
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while read -r dev_id modalias_val; do
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case "$modalias_val" in
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# ECKD device types
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*3390*|*3380*|*9345*)
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chzdev dasd-eckd --enable --persistent "$dev_id" \
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$_zdev_dasd_attrs $zdev_dasd_base_args --force
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;;
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# FBA device types
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*3370*|*9336*)
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chzdev dasd-fba --enable --persistent "$dev_id" \
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$_zdev_dasd_attrs $zdev_dasd_base_args --force
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;;
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esac
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done
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;;
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esac
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done # input redir w/ process substitution causes syntax error in dracut env
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}
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