Re: PCI Express support for 2.4 kernel

[Arjan van de Ven <arjanv@redhat.com>]

On Wed, Dec 17, 2003 at 01:55:40AM -0500, Jeff Garzik wrote:
> Linus Torvalds wrote:
> >So if this will only matter for PCI-X drivers and not for discovery etc, I
> >wonder if it wouldn't make sense to have this as a totally separate
> >function? Instead of trying to make the existing "pci_config_xxxx()" 
> >stuff work with PCI-X, wouldn't it be nicer to have the driver just map 
> >its config space on probe?
> 
> Not a bad idea...  After posting yesterday on this thread, I had the 
> thought:  Just like PCI has readl() and sbus has sbus_readl(), why not 
> pciex_cfg_readl() ?
> 
> 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...