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

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Date:	Tue, 14 Sep 2010 09:45:14 -0400
From:	Don Zickus <dzickus@...hat.com>
To:	Ingo Molnar <mingo@...e.hu>
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

On Tue, Sep 14, 2010 at 02:21:31PM +0200, Ingo Molnar wrote:
> 
> * 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.

Interesting.  I think the only southbridge I see regularly are Intel, AMD
and Nvidia (with Nvidia being more problematic than others).
Unfortunately, getting specs for Nvidia is very difficult.

But that might help narrow down where the NMI problem is.

Cheers,
Don

> 
> Thanks,
> 
> 	Ingo
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