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From 0be17528e527c3e5081fc7e03ec51bb17d9b08cc Mon Sep 17 00:00:00 2001
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From: Pratyush Anand <panand@redhat.com>
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Date: Wed, 16 Mar 2016 09:09:10 +0530
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Subject: [PATCH] watchdog: install module for active watchdog
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Recently following patches have been added in upstream Linux kernel, which
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(1) fixes parent of watchdog_device so that
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/sys/class/watchdog/watchdogn/device is populated. (2) adds some sysfs
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device attributes so that different watchdog status can be read.
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http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=6551881c86c791237a3bebf11eb3bd70b60ea782
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http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=906d7a5cfeda508e7361f021605579a00cd82815
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http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=33b711269ade3f6bc9d9d15e4343e6fa922d999b
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With the above support, now we can find out whether a watchdog is active or
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not. We can also find out the driver/module responsible for that watchdog
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device.
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Proposed patch uses above support and then adds module of active watchdog
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in initramfs generated by dracut for hostonly mode. Kernel module for
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inactive watchdog will be added as well for none hostonly mode.
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When an user does not want to add kernel module, then one should exclude
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complete dracut watchdog module with --omit.
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Testing:
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-- When watchdog is active watchdog modules were added
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# cat /sys/class/watchdog/watchdog0/identity
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iTCO_wdt
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# cat /sys/class/watchdog/watchdog0/state
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active
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# dracut --hostonly initramfs-test.img -a watchdog
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# lsinitrd initramfs-test.img | grep iTCO
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-rw-r--r-- 1 root root 9100 Feb 24 09:19 usr/lib/modules/.../kernel/drivers/watchdog/iTCO_vendor_support.ko
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-rw-r--r-- 1 root root 19252 Feb 24 09:19 usr/lib/modules/.../kernel/drivers/watchdog/iTCO_wdt.ko
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-- When watchdog is inactive then watchdog modules were not added
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# cat /sys/class/watchdog/watchdog0/state
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inactive
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# dracut --hostonly initramfs-test.img -a watchdog
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# lsinitrd initramfs-test.img | grep iTCO
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-- When watchdog is inactive, but no hostonly mode, watchdog modules were added
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# cat /sys/class/watchdog/watchdog0/state
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inactive
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# dracut --no-hostonly initramfs-test.img -a watchdog
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# lsinitrd initramfs-test.img | grep iTCO
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-rw-r--r-- 1 root root 9100 Feb 24 09:19 usr/lib/modules/.../kernel/drivers/watchdog/iTCO_vendor_support.ko
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-rw-r--r-- 1 root root 19252 Feb 24 09:19 usr/lib/modules/.../kernel/drivers/watchdog/iTCO_wdt.ko
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Signed-off-by: Pratyush Anand <panand@redhat.com>
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Cc: Dave Young <dyoung@redhat.com>
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Cc: Don Zickus <dzickus@redhat.com>
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Cc: Harald Hoyer <harald@redhat.com>
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---
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modules.d/04watchdog/module-setup.sh | 28 ++++++++++++++++++++++++++++
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1 file changed, 28 insertions(+)
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diff --git a/modules.d/04watchdog/module-setup.sh b/modules.d/04watchdog/module-setup.sh
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index 7e32210e..4680936f 100755
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--- a/modules.d/04watchdog/module-setup.sh
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+++ b/modules.d/04watchdog/module-setup.sh
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@@ -31,3 +31,31 @@ install() {
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inst_multiple -o wdctl
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}
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+installkernel() {
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+ [[ -d /sys/class/watchdog/ ]] || return
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+ for dir in /sys/class/watchdog/*; do
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+ [[ -d "$dir" ]] || continue
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+ [[ -f "$dir/state" ]] || continue
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+ active=$(< "$dir/state")
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+ ! [[ $hostonly ]] || [[ "$active" = "active" ]] || continue
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+ # device/modalias will return driver of this device
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+ wdtdrv=$(< "$dir/device/modalias")
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+ # There can be more than one module represented by same
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+ # modalias. Currently load all of them.
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+ # TODO: Need to find a way to avoid any unwanted module
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+ # represented by modalias
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+ wdtdrv=$(modprobe -R $wdtdrv)
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+ instmods $wdtdrv
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+ # however in some cases, we also need to check that if there is
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+ # a specific driver for the parent bus/device. In such cases
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+ # we also need to enable driver for parent bus/device.
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+ wdtppath=$(readlink -f "$dir/device/..")
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+ while [ -f "$wdtppath/modalias" ]
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+ do
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+ wdtpdrv=$(< "$wdtppath/modalias")
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+ wdtpdrv=$(modprobe -R $wdtpdrv)
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+ instmods $wdtpdrv
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+ wdtppath=$(readlink -f "$wdtppath/..")
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+ done
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+ done
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+}
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