linux-kernel - Re: [RFC 5/6] x86, NMI, Add support to notify hardware error with unknown NMI

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Message-ID: <20100913203654.26724055@basil.nowhere.org>
Date:	Mon, 13 Sep 2010 20:36:54 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Don Zickus <dzickus@...hat.com>
Cc:	Huang Ying <ying.huang@...el.com>, Ingo Molnar <mingo@...e.hu>,
	"H. Peter Anvin" <hpa@...or.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC 5/6] x86, NMI, Add support to notify hardware error with
 unknown NMI


> > 
> > But if it's generic if not on the screen it should
> > be at least in the error serialization data and logged after boot.
> 
> I guess I don't know what that is, 'error serialization data'.  Is
> there somewhere I can read more about it?

That's already supported in MCE -- saving the error record to NVRAM
and logging it after reboot. NMI should probably do the same.
It's much nicer than getting it from a console.

> > 
> > At least on PCI-E it may be enough to simply dump all recent AER
> > data.
> 
> This assumes AER is supported on the bridge?  Which for newer chips is
> probably true, but I wasn't sure about older ones.

Today's servers should usually have AER at least.

For old systems you only can get the few bits in PCI space.

> How would I dump AER data from within the kernel?

Would need a buffer that is dumped for past events and 
reading the registers for not yet reported. Right now some
infrastructure is needed.


-Andi
-- 
ak@...ux.intel.com -- Speaking for myself only.
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