Re: [patch] Make MMCONFIG space (extended PCI config space) a driver opt-in issue

[Jeff Garzik <jeff@garzik.org>]

Linus Torvalds wrote:
> (For example: I have three machines that I know have working MMCONF. On 
> only one of theose does Linux actually even enable MMCONF accesses, 
> because on the two other ones the BIOSes do the crazy "put it in some 
> space that is reserved by PnP crap later", so we actually refuse to touch 
> it. So at least in my limited environment, we hardly get any MMCONFIG test 
> coverage, exactly because we have to be so totally anal about not enabling 
> it early, because we cannot guarantee that it's not clashing with anything 
> else).

Definitely.  So, two questions:


What's the preferred way to deal with the desire to view extended config 
space with "lspci -vvvxxx"?



Right now, we enable mmconfig for the bus/domain range requested by the 
BIOS [heh, so by implication many early BIOSen stomp themselves].

Is there a path for hw vendors, after passing 1,001 anal checks, to 
maintain the current behavior as it exists today in 
arch/x86/pci/mmconfig_{32,64}.c?

	Jeff