Re: /proc/pci deprecation?

[Jeff Garzik <jgarzik@pobox.com>]

On Mon, Dec 09, 2002 at 10:11:39AM -0800, Linus Torvalds wrote:
> 
> On 9 Dec 2002, Alan Cox wrote:
> >
> > 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.
> 
> That's definitely where it should be - the behaviour of the
> PCI_INTERRUPT_LINE register is clearly chip-specific, so it should be in
> the chip-specific drivers..
> 
> It's a kind of strange behaviour, though. What chip is this? It sounds
> kind of convenient, but as far as I can tell it can only work for those
> kinds of PCI devices that are on the same chip as the irq controller..

As a reminder of ancient times, one of the reasons I wanted to do
per-PCI-device interrupt routing was due to the older incarnation of
these chips, the Via 686 a/b southbridges.  They have a similar method
of routing interrupts, where writing to PCI_INTERRUPT_LINE directly
makes internal chip magic occur.  So you are correct WRT
"only work ... on the same chip as the irq controller"

	Jeff