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

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Message-ID: <20100914122131.GF12425@elte.hu>
Date:	Tue, 14 Sep 2010 14:21:31 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Don Zickus <dzickus@...hat.com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Huang Ying <ying.huang@...el.com>,
	"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


* Don Zickus <dzickus@...hat.com> wrote:

> > > > 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.
> 
> Oh ok.

The proper approach would be not to add hacks to the NMI code but to 
implement southbridge drivers - which would also have NMI callbacks. 
These are unchartered waters, but variance in that space is reducing 
systematically so it would be worth a shot.

Thanks,

	Ingo
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