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." -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
