Out-of-band SRESET

[Rick Altherr]

I know x86 has debug modes but I'm unfamiliar with them.  I'll ask my
teammates who know more for some details to see if and how the BMC is
involved.

On Thu, Mar 16, 2017 at 8:37 AM, Patrick Williams <patrick at stwcx.xyz> wrote:
> On Thu, Mar 16, 2017 at 01:32:52PM +0530, Ananth N Mavinakayanahalli wrote:
>> Hi,
>>
>> One requirement from a OpenPOWER service point-of-view is to be able to
>> trigger an out-of-band SRESET on a unresponsive system. We can then have
>> the necessary plumbing in the host Linux kernel to either drop the
>> machine into a debugger or trigger a dump capture, if configured.
>>
>> On P9, this would translate to a series of SCOM operations for the SBE
>> It would be good to have a REST API defined to cater to this specific
>> purpose.
>>
>> The API should cater to:
>> - SRESET a core
>> - SRESET a chip
>> - SRESET all cores
>>
>> Thoughts?
>>
>> Regards,
>> Ananth
>>
>
> Ananth,
>
> I understand the desire from your end with respect to debugging the
> host.  Is there something we can do to model this better from a REST
> perspective to make this less Power-specific?  Do other architectures
> also have a "send debug interrupt"?
>
> Do you need to SRESET targeting an SMT thread?  We will need to come up
> with some kind of identifier for sending the debug interrupts.
>
> --
> Patrick Williams