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[Bug 1482343] Re: Trigger a checkstop on unrecoverable MCE/HMI errors to inform BMC/OCC about the error.
Submitted for Vivid: https://lists.ubuntu.com/archives/kernel-
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Trigger a checkstop on unrecoverable MCE/HMI errors to inform BMC/OCC
about the error.
Status in linux package in Ubuntu:
Status in linux source package in Vivid:
Status in linux source package in Wily:
The current implementation of Machine Check handler and HMI handler in
Linux, goes down kernel panic path for unrecoverable errors. On FSP
based system FSP also gets notified about these errors which then
forwards it to PRD (that runs on FSP) for error analysis and gard
On OpenPower (BMC based system e.g. Habanero from TYAN) where PRD runs
in Linux host, it never gets a chance to do error analysis at the time
of Linux crash and no gard record is created for such errors. Since
the faulty component never gets de-configured, the system is
vulnerable to get hit by same HW error again.
To fix this issue, a new OPAL call 'opal_cec_reboot2()' has been
introduced to trigger a checkstop on BMC based system to inform
BMC/OCC about this error, so that BMC can collect relevant data for
error analysis and decide what component to de-configure before
rebooting. Linux kernel should invoke this opal call for unrecoverable
MCE and HMI instead before calling kernel panic so that OCC is
informed about the error.
The kernel changes has already been posted to upstream and are listed
Above patches needs to be included in ubuntu 14.04.3+
We will update this bug with commit ids, once the above patches are
Contact Information = mahesh.salgaonkar@xxxxxxxxxx
Linux rcx2d403 3.19.0-26-generic #27 SMP Tue Aug 4 01:38:15 CDT 2015 ppc64le ppc64le ppc64le GNU/Linux
---Additional Hardware Info---
Habanero pass2 system
Machine Type = OpenPower, Habanero
If system is hung, it can be recovered by sending ipmi power off/on command.
$ ipmitool -H <BMC> -I lanplus -U <user> -P <passwd> power off
$ ipmitool -H <BMC> -I lanplus -U <user> -P <passwd> power on
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