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To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Linus Torvalds <torvalds@transmeta.com>,
       Richard Henderson <rth@twiddle.net>, Patrick Mochel <mochel@osdl.org>,
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       jgarzik@pobox.com
Subject: Re: /proc/pci deprecation?
References: <Pine.LNX.4.44.0212090854510.3397-100000@home.transmeta.com>
	<1039458577.10470.49.camel@irongate.swansea.linux.org.uk>
From: ebiederm@xmission.com (Eric W. Biederman)
Date: 09 Dec 2002 22:57:26 -0700
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Alan Cox <alan@lxorguk.ukuu.org.uk> writes:

> On Mon, 2002-12-09 at 17:00, Linus Torvalds wrote:
> > On 9 Dec 2002, Alan Cox wrote:
> > > I wonder if this is why we have all these problems with VIA chipset
> > > interrupt handling. According to VIA docs they _do_ use
> > > PCI_INTERRUPT_LINE on integrated devices to select the IRQ routing
> > > between APIC and PCI/ISA etc, as well as 0 meaning "IRQ disabled"
> > 
> > Whee.. That sounds like a load of crock in the first place, since the
> > PCI_INTERRUPT_LINE thing should be just a scratch register as far as I
> > know. However, it doesn't really matter - we definitely should never write
> > to it anyway, so the VIA behaviour while strange should still be
> > acceptable.
> 
> Tested and verified. If I leave it alone non apic mode works. To use
> APIC mode I have to write the new IRQ value into that register. I've
> shoved that into the driver for now, since its a demented chip specific
> horror.

Think you can put in a reboot notifier/device shutdown method to restore
it to it's old value, so kexec has a chance of working correctly with
this hardware.


Eric
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