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

Ingo Molnar
2009-07-01T11:11:20Z

* Maciej W. Rozycki <macro@linux-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