On Mon, 2014-09-29 at 15:33 -0600, Bjorn Helgaas wrote: > > Right and on powerpc and others as well. We need to survey existing > > resources. We also have a number of platform things that might need > > to happen before we do the final re-assignment pass. > > That's true today. But I don't know whether it *has* to be this way > forever. On x86, pcibios_resource_survey() throws in E820 information > (which we know long before we do any PCI enumeration) and some IO-APIC > resources (it looks like we also know these before PCI enumeration). > Powerpc has pcibios_reserve_legacy_regions(), but that looks like > mostly stuff that could be done when we find the host bridge, before > we enumerate PCI devices below it. Oh we can probably change that but it's going to be much more work than just moving the assignment into pci_scan_root_bus(). There are also a number of subtle and not-so-subtle bits of code that rely on side effects of the current code such as anything that tests for bus->added or dev->added. Again, nothing we can't sort out eventually but the transition might be a bit painful. We might need to introduce a new flag for platforms converted to the "new style" generalized resource assignment which we can deprecate once everybody has moved over. Cheers, Ben. -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
