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. It is reasonable to always add kernel watchdog module if dracut watchdog module has been added. When an user does not want to add kernel module, then he/she 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 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 # lsinitrd -f tmp/active-watchdogs initramfs-test.img iTCO_wdt -- When watchdog is inactive then watchdog modules were not added # cat /sys/class/watchdog/watchdog0/state inactive # dracut initramfs-test.img -a watchdog # lsinitrd initramfs-test.img | grep iTCO # lsinitrd -f tmp/active-watchdogs initramfs-test.img Signed-off-by: Pratyush Anand <panand@xxxxxxxxxx> Cc: Dave Young <dyoung@xxxxxxxxxx> Cc: Don Zickus <dzickus@xxxxxxxxxx> Cc: Harald Hoyer <harald@xxxxxxxxxx> --- modules.d/04watchdog/module-setup.sh | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) diff --git a/modules.d/04watchdog/module-setup.sh b/modules.d/04watchdog/module-setup.sh index 7ec757aec032..6232afb0d9ca 100755 --- a/modules.d/04watchdog/module-setup.sh +++ b/modules.d/04watchdog/module-setup.sh @@ -32,3 +32,36 @@ install() { inst_multiple -o wdctl } +installkernel() { + cd /sys/class/watchdog + for dir in */; do + cd $dir + active=`[ -f state ] && cat state` + if [ "$active" = "active" ]; then + # applications like kdump need to know that, which + # watchdog modules have been added into initramfs + echo `cat identity` >> "$initdir/tmp/active-watchdogs" + # device/modalias will return driver of this device + wdtdrv=`cat 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 $wdtdrv | tr "\n" "," | sed 's/.$//'` + instmods $wdtdrv + # however in some cases, we also need to check that if + # there is a specific driver for the parent bus/device. + # In such cases we also need to enable driver for parent + # bus/device. + wdtppath="device/.."; + while [ -f "$wdtppath/modalias" ] + do + wdtpdrv=`cat $wdtppath/modalias` + wdtpdrv=`modprobe -R $wdtpdrv | tr "\n" "," | sed 's/.$//'` + instmods $wdtpdrv + wdtppath="$wdtppath/.." + done + fi + cd .. + done +} -- 2.5.0 -- To unsubscribe from this list: send the line "unsubscribe initramfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
