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SubjectRe: [PATCH 16/16 v6] PCI: document the new PCI boot parameters
On Fri, Nov 07, 2008 at 11:40:21AM +0800, Zhao, Yu wrote:
> Greg KH wrote:
> >We've thought about this in the past, and even Microsoft said it was
> >going to happen for Vista, but they realized in the end, like we did a
> >few years previously, that it would require full support of all PCI
> >drivers as well (if you rebalance stuff that is already bound to a
> >driver.) So they dropped it.
> >
> >When would you want to do this kind of rebalancing? Before any PCI
> >driver is bound to any devices? Or afterwards?
>
> I guess if we want the rebalance dynamic, then we should have it full --
> the rebalance would be functional even after the driver is loaded.
>
> But in most cases, there will be problem when we unload driver from a
> hard disk controller, etc. We can mount root on a ramdisk and do the
> rebalance there, but it's complicated for a real user.
>
> So looks like doing rebalancing before any driver is bound to any device
> is also a nice idea, if user can get a shell to do rebalance before
> built-in PCI driver grabs device.

Can we use the suspend/resume code to do this? Some drivers (sym2 for
one) would definitely need to rerun some of their init code to cope with
a BAR address changing.

--
Matthew Wilcox Intel Open Source Technology Centre
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours. We can't possibly take such
a retrograde step."


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