On Tue, Nov 19, 2019 at 03:17:04AM +0000, Nicholas Johnson wrote: > I did just discover linux-next and I built it. Should I be doing this > more often to help find regressions? Yes, if you build and run linux-next, that's a great service because it helps find problems before they appear in mainline. > I will now concentrate on fixing the problem where pci=nocrs does not > ignore the bus resource. One motherboard I own gives 00-7e or similar, > instead of 00-ff. The nocrs does not help, and I had to patch the kernel > myself. Only acpi=off fixes the problem, while knocking out SMT (MADT), > IOMMU (DMAR) and the ability to suspend without crashing. > > If you disagree that nocrs should override bus resource, then let me > know and I will not attempt this. I guess the problem is that with "pci=nocrs", we ignore the MMIO and I/O port resources from _CRS, but we still pay attention to bus number resources in _CRS? That does sound like it would be unexpected behavior. I *would* like to see the complete dmesg log because these _CRS methods are pretty reliable because Windows relies on them as well, so problems are frequently a result of Linux defects. If we can fix Linux or automatically work around issues so users don't have to use "pci=nocrs" explicitly, that's the best. Bjorn
