Re: PCI Express support for 2.4 kernel

Alan Cox
2003-12-17T23:06:29Z

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