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<p class="MsoNormal"><span style="color:#002060">Some questions. <o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#002060"><o:p> </o:p></span></p>
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<li class="MsoListParagraph" style="color:#002060;margin-left:0in;mso-list:l0 level1 lfo2">
How does BMC know when to trigger NMI? Are we relying on agents to run and send heartbeat? Can this be done agentless ?
<o:p></o:p></li><li class="MsoListParagraph" style="color:#002060;margin-left:0in;mso-list:l0 level1 lfo2">
How do we NMI on non x86 platforms ? <o:p></o:p></li></ol>
<p class="MsoNormal"><span style="color:#002060"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#002060">we should brainstorm to create a generic framework to solve this problem.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#002060"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#002060">What<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#002060">Neeraj<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#002060"><o:p> </o:p></span></p>
<p class="MsoNormal"><b>From:</b> openbmc <openbmc-bounces+neladk=microsoft.com@lists.ozlabs.org>
<b>On Behalf Of </b>Jayanth Othayoth<br>
<b>Sent:</b> Wednesday, May 15, 2019 5:40 AM<br>
<b>To:</b> openbmc@lists.ozlabs.org; geissonator@gmail.com; bradleyb@fuzziesquirrel.com<br>
<b>Subject:</b> Add support to debug unresponsive host<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">## Problem Description<br>
Issue #457: Add support to debug unresponsive host.<br>
<br>
Scope: High level design direction to solve this problem, <br>
<br>
## Background and References<br>
There are situation at customer places where OPAL/Linux goes unresponsive causing a system hang. And there is no way to figure out what went wrong with Linux kernel or OPAL. Looking for a way to trigger a dump capture on Linux host so that we can capture the
OS dump for post analysis.<br>
<br>
## Proposed Design for POWER processor based systems:<br>
Get all Host CPUs in reset vector and Linux then has a mechanism to patch it into panic-kdump path to trigger dump capture. This will enable us to analyze and fix customer issue where we see Linux hang and unresponsive system.<br>
<br>
### Redfish Schema used:<br>
* Reference: DSP2046 2018.3,<br>
* ComputerSystem 1.6.0 schema provides an action called #ComputerSystem.Reset”, This action is used to reset the system. ResetType parameter is used for indicating type of reset need to be performed. In this use case we can use “Nmi” type
<br>
* Nmi: Generate a Diagnostic Interrupt (usually an NMI on x86 systems) to cease normal operations, perform diagnostic actions and typically halt the system.
<span style="font-family:"Tahoma",sans-serif">
</span><br>
* ### d-bus :<br>
<br>
Option 1: Extending the existing d-bus interface state.Host name space ( /openbmc/phosphor-dbus-interfaces/xyz/openbmc_project/State/Host.interface.yaml ) to support new RequestedHostTransition property called “Nmi”. d-bus backend can internally invoke
processor specific target to do Sreset( equivalent to x86 NMI) and associated actions.<br>
<br>
Option 2: Introducing new d-bus interface in the control.state namespace ( /openbmc/phosphor-dbus-interfaces/xyz/openbmc_project/Control/Host/NMI.interface.yaml) namespace and implement the new d-bus back-end for respective processor specific targets.<br>
<br>
## Alternatives Considered<br>
NA<br>
<br>
## Impacts:<br>
NA<br>
<br>
## Testing<br>
NA<br>
<br>
Looking for input from the team on this High level design direction approach.<o:p></o:p></p>
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