On Wed, 2015-10-21 at 18:27 -0700, David Miller wrote: > From: Yinghai Lu <ying...@kernel.org> > Date: Wed, 21 Oct 2015 11:16:53 -0700 > > > otherwise we need to compare res with pbm->mem_space or pbm > ->mem64_space > > to get direct parent for request_resource_conflict() calling in > > pci_register_legacy_regions(). > > Right, this is the issue. > > On sparc64, the cpu physical base address used for accessing 64-bit > and non-64-bit memory spaces is different. > > And that's why the resource values will be different.
This is the same on power btw, we have separate PowerBus windows to the PHB that get mapped respectively to 32-bit PCI MMIO and 64-bit PCI MMIO. The former gets "remapped" to generates 0-based PCI cycles, while the latter is 1:1. So the offset between CPU and PCI changes depending on which window you hit. Cheers, Ben. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
