On Tue, 9 Feb 2021, Maciej W. Rozycki wrote: > > > Do you need to have this verified anyhow? I only have a non-coherent 5Kc > > > Malta though. > > > > If you get a chance to test this logic, that would be great. > > I'll try to give it a hit in the next few days then. Installed in my > Malta I have a DEFPA, which is about as serious a DMA user as a piece of > classic PCI hardware could be. I need to debug the issue of another DEFPA > not working with my POWER9 system, possibly due to an IOMMU handling bug > (hopefully not broken host hardware), so I'll take the opportunity and do > it all at once. FYI still working on it. The POWER9 issue turned out to be a combination of a driver configuration issue with the distribution caused by a chain of historical events leading to the use of PCI I/O bus commands not supported by the PHB PCIe host bridge and a bad solder joint with the adapter's main PDQ IC on a 20+ years old brand new card. I hope to have the adapter properly fixed soon and I'll look at the Malta side now, possibly using the old server whose DEFPA has worked flawlessly for some 20 years now. I have planned to use the interface to supply NFS root, which I think should be enough of a stress test. Patches will follow sometime too for the driver's configuration issue, a nonsense in 2021 I should have long addressed, and for resource handling which I think should explicitly fail port I/O claims on a system that does not support port I/O at all and should not allow this: # cat /proc/ioports 00000000-ffffffffffffffff : 0031:02:04.0 # to happen. Maciej
