linux-kernel - Re: [PATCH] x86: sysctl to allow panic on IOCK NMI error

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Message-ID: <20090701111003.GC15958@elte.hu>
Date:	Wed, 1 Jul 2009 13:10:03 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	"Maciej W. Rozycki" <macro@...ux-mips.org>
Cc:	Greg KH <gregkh@...e.de>, x86@...nel.org,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Kurt Garloff <garloff@...e.de>, linux-kernel@...r.kernel.org,
	Yinghai Lu <yinghai@...nel.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>
Subject: Re: [PATCH] x86: sysctl to allow panic on IOCK NMI error


* Maciej W. Rozycki <macro@...ux-mips.org> wrote:

> On Tue, 30 Jun 2009, Greg KH wrote:
> 
> > >  These days an IOCK NMI typically happens in response to a PCI 
> > > SERR -- it may be useful to traverse PCI buses to find the 
> > > offender and dump this information on this occasion too.  The 
> > > south bridge may have additional status too.
> > 
> > Sure, that would be great to have.  Care to make a patch?  :)
> 
>  ENOTIME, sorry.  Next year perhaps.  Or a homework project for 
> one of the newbies. ;)

You know that this project would kill a newbie, right? :)

We have no real southbridge drivers on x86 - but we should certainly 
add some. Also, walking the PCI device tree from NMI context is 
tricky as the lists there are not NMI safe - we could crash if we 
happen to get a #IOCK while loading/unloading drivers (which is rare 
but could happen).

IMHO it's all very much desired functionality, but highly 
non-trivial.

	Ingo
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