Re: PCI Express support for 2.4 kernel

[Alan Cox]

On Wed, Dec 17, 2003 at 09:22:35AM +0100, Arjan van de Ven wrote:
> > Any PCI-Ex drivers would obviously _know_ they are PCI Ex, and they 
> > could communicate that by virtue of simply using new functions.  Older 
> > drivers for older hardware would use the old API and not care... 
> > Further, PCI-Ex operations are already basically readl/writel anyway, so 
> > going through the forest of pci_cfg_ops pointers and such would just add 
> > needless layering.
> 
> BUT powermanagement and co will need to potentially do stuff too with the
> config space...

And X11 will want to access it via /proc interfaces. And someone will eventually
go and design a different way to access PCI-EX for their hardware 8)

The PCI layer is a nice abstraction and config space is slow anyway

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