95 lines
4.0 KiB
Diff
95 lines
4.0 KiB
Diff
|
From 3aac6827444c897aab59d7638aa191d510fd4758 Mon Sep 17 00:00:00 2001
|
||
|
|
From: Pratyush Anand <panand@redhat.com>
|
||
|
|
Date: Wed, 16 Mar 2016 09:09:10 +0530
|
||
|
|
Subject: [PATCH] watchdog: install module for active watchdog
|
||
|
|
|
||
|
|
Recently following patches have been added in upstream Linux kernel, which
|
||
|
|
(1) fixes parent of watchdog_device so that
|
||
|
|
/sys/class/watchdog/watchdogn/device is populated. (2) adds some sysfs
|
||
|
|
device attributes so that different watchdog status can be read.
|
||
|
|
|
||
|
|
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=6551881c86c791237a3bebf11eb3bd70b60ea782
|
||
|
|
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=906d7a5cfeda508e7361f021605579a00cd82815
|
||
|
|
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=33b711269ade3f6bc9d9d15e4343e6fa922d999b
|
||
|
|
|
||
|
|
With the above support, now we can find out whether a watchdog is active or
|
||
|
|
not. We can also find out the driver/module responsible for that watchdog
|
||
|
|
device.
|
||
|
|
|
||
|
|
Proposed patch uses above support and then adds module of active watchdog
|
||
|
|
in initramfs generated by dracut for hostonly mode. Kernel module for
|
||
|
|
inactive watchdog will be added as well for none hostonly mode.
|
||
|
|
|
||
|
|
When an user does not want to add kernel module, then one should exclude
|
||
|
|
complete dracut watchdog module with --omit.
|
||
|
|
|
||
|
|
Testing:
|
||
|
|
-- When watchdog is active watchdog modules were added
|
||
|
|
# cat /sys/class/watchdog/watchdog0/identity
|
||
|
|
iTCO_wdt
|
||
|
|
# cat /sys/class/watchdog/watchdog0/state
|
||
|
|
active
|
||
|
|
# dracut --hostonly initramfs-test.img -a watchdog
|
||
|
|
# lsinitrd initramfs-test.img | grep iTCO
|
||
|
|
-rw-r--r-- 1 root root 9100 Feb 24 09:19 usr/lib/modules/.../kernel/drivers/watchdog/iTCO_vendor_support.ko
|
||
|
|
-rw-r--r-- 1 root root 19252 Feb 24 09:19 usr/lib/modules/.../kernel/drivers/watchdog/iTCO_wdt.ko
|
||
|
|
|
||
|
|
-- When watchdog is inactive then watchdog modules were not added
|
||
|
|
# cat /sys/class/watchdog/watchdog0/state
|
||
|
|
inactive
|
||
|
|
# dracut --hostonly initramfs-test.img -a watchdog
|
||
|
|
# lsinitrd initramfs-test.img | grep iTCO
|
||
|
|
|
||
|
|
-- When watchdog is inactive, but no hostonly mode, watchdog modules were added
|
||
|
|
# cat /sys/class/watchdog/watchdog0/state
|
||
|
|
inactive
|
||
|
|
# dracut --no-hostonly initramfs-test.img -a watchdog
|
||
|
|
# lsinitrd initramfs-test.img | grep iTCO
|
||
|
|
-rw-r--r-- 1 root root 9100 Feb 24 09:19 usr/lib/modules/.../kernel/drivers/watchdog/iTCO_vendor_support.ko
|
||
|
|
-rw-r--r-- 1 root root 19252 Feb 24 09:19 usr/lib/modules/.../kernel/drivers/watchdog/iTCO_wdt.ko
|
||
|
|
|
||
|
|
Signed-off-by: Pratyush Anand <panand@redhat.com>
|
||
|
|
Cc: Dave Young <dyoung@redhat.com>
|
||
|
|
Cc: Don Zickus <dzickus@redhat.com>
|
||
|
|
Cc: Harald Hoyer <harald@redhat.com>
|
||
|
|
---
|
||
|
|
modules.d/04watchdog/module-setup.sh | 28 ++++++++++++++++++++++++++++
|
||
|
|
1 file changed, 28 insertions(+)
|
||
|
|
|
||
|
|
diff --git a/modules.d/04watchdog/module-setup.sh b/modules.d/04watchdog/module-setup.sh
|
||
|
|
index 7ec757a..0ffaa96 100755
|
||
|
|
--- a/modules.d/04watchdog/module-setup.sh
|
||
|
|
+++ b/modules.d/04watchdog/module-setup.sh
|
||
|
|
@@ -32,3 +32,31 @@ install() {
|
||
|
|
inst_multiple -o wdctl
|
||
|
|
}
|
||
|
|
|
||
|
|
+installkernel() {
|
||
|
|
+ [[ -d /sys/class/watchdog/ ]] || return
|
||
|
|
+ for dir in /sys/class/watchdog/*; do
|
||
|
|
+ [[ -d "$dir" ]] || continue
|
||
|
|
+ [[ -f "$dir/state" ]] || continue
|
||
|
|
+ active=$(< "$dir/state")
|
||
|
|
+ ! [[ $hostonly ]] || [[ "$active" = "active" ]] || continue
|
||
|
|
+ # device/modalias will return driver of this device
|
||
|
|
+ wdtdrv=$(< "$dir/device/modalias")
|
||
|
|
+ # There can be more than one module represented by same
|
||
|
|
+ # modalias. Currently load all of them.
|
||
|
|
+ # TODO: Need to find a way to avoid any unwanted module
|
||
|
|
+ # represented by modalias
|
||
|
|
+ wdtdrv=$(modprobe -R $wdtdrv)
|
||
|
|
+ instmods $wdtdrv
|
||
|
|
+ # however in some cases, we also need to check that if there is
|
||
|
|
+ # a specific driver for the parent bus/device. In such cases
|
||
|
|
+ # we also need to enable driver for parent bus/device.
|
||
|
|
+ wdtppath=$(readlink -f "$dir/device/..")
|
||
|
|
+ while [ -f "$wdtppath/modalias" ]
|
||
|
|
+ do
|
||
|
|
+ wdtpdrv=$(< "$wdtppath/modalias")
|
||
|
|
+ wdtpdrv=$(modprobe -R $wdtpdrv)
|
||
|
|
+ instmods $wdtpdrv
|
||
|
|
+ wdtppath=$(readlink -f "$wdtppath/..")
|
||
|
|
+ done
|
||
|
|
+ done
|
||
|
|
+}
|