+Cc: Mika, who is supporting watchdog driver(s). On Wed, Jul 24, 2019 at 01:04:45PM +0530, Vignesh Raman wrote: > Hi, > > I'm seeing an issue where the iTCO_wdt module doesn't load with the below error, > > [ 3.827599] iTCO_wdt: Intel TCO WatchDog Timer Driver v1.11 > [ 3.828440] iTCO_wdt iTCO_wdt: can't request region for resource > [mem 0x00c5fffc-0x00c5ffff] > [ 3.828803] iTCO_wdt: probe of iTCO_wdt failed with error -16 > > CPU and logs: > cpu: Intel(R) Core(TM) i3-8100 CPU @ 3.60GHz > dmesg logs: http://paste.debian.net/1092702/ > lsmod output: https://paste.debian.net/1092703/ > root@localhost:~# uname -a > Linux localhost.localdomain 4.14.103-rt55 #1 SMP PREEMPT RT Tue Jul 23 > 03:53:28 UTC 2019 x86_64 GNU/Linux > > Please let me know if the error (can't request region for resource) is > related to the patches below, > https://patchwork.kernel.org/patch/9627085/ > https://lore.kernel.org/patchwork/patch/770990/ > > I tested with the patch > https://lore.kernel.org/patchwork/patch/770990/ and it fixes the > issue. > root@localhost:/home/vignesh# dmesg | grep wdt > [ 5.766470] iTCO_wdt: Intel TCO WatchDog Timer Driver v1.11 > [ 5.767104] iTCO_wdt: Found a Intel PCH TCO device (Version=4, > TCOBASE=0x0400) > [ 5.767865] iTCO_wdt: initialized. heartbeat=30 sec (nowayout=0) > > But the patch was not merged upstream. > > When testing the hardware watchdog, it doesn't trigger a reset even > after triggering a sysrq crash. > The system freezes and there is no reboot. > > I noticed the timeleft value is not getting updated. > root@localhost:~# cat /sys/class/watchdog/watchdog0/timeleft > 15 > root@localhost:~# cat /sys/class/watchdog/watchdog0/timeleft > 15 > root@localhost:~# cat /sys/class/watchdog/watchdog0/timeleft > 15 > > This issue has been discussed in below email thread, > http://lkml.iu.edu/hypermail/linux/kernel/1609.1/01979.html > https://lkml.org/lkml/2016/9/8/641 > > In another platform the hardware watchdog works. > root@debian:~# dmesg | grep wdt > [ 3.901842] iTCO_wdt: Intel TCO WatchDog Timer Driver v1.11 > [ 3.903415] iTCO_wdt: Found a Intel PCH TCO device (Version=4, > TCOBASE=0x0400) > [ 3.937816] iTCO_wdt: initialized. heartbeat=30 sec (nowayout=0) > > CPU and logs > cpu: Intel(R) Core(TM) i7-6700 CPU @ 3.40GHz > dmesg logs: http://paste.debian.net/1092845/ > lsmod output: http://paste.debian.net/1092846/ > root@debian:~# uname -a > Linux debian 4.14.103-rt55 #1 SMP PREEMPT RT Tue Jul 23 03:53:28 UTC > 2019 x86_64 GNU/Linux > > Hardware watchdog triggers a reset and the watchdog timer counter is > started and the value gets updated. > root@debian:~# cat /sys/class/watchdog/watchdog0/timeleft > 13 > root@debian:~# cat /sys/class/watchdog/watchdog0/timeleft > 12 > root@debian:~# cat /sys/class/watchdog/watchdog0/timeleft > 11 > root@debian:~# > > My questions: > 1. Please let me know if it is okay to take > https://lore.kernel.org/patchwork/patch/770990/ patch or will there be > an update to the original patch? > 2. Could the hardware watchdog not triggering a reset (timeleft value > not getting updated) could be a hardware problem? > > Thanks. > > Regards, > Vignesh -- With Best Regards, Andy Shevchenko
