On Thu, May 23, 2019 at 09:48:40AM +0000, Koenig, Christian wrote: > I don't adjust the address manually anywhere. I just call > dma_map_resource() and use the resulting DMA address to access the other > devices PCI BAR. > > At least on my test system (AMD CPU + AMD GPUs) this seems to work > totally fine. Currently trying to find time and an Intel box to test it > there as well. The problem shows up if pci_bus_address() returns a different address than pci_resource_start(), should be easy to check if that happens. IIRC it is something mostly seen on embedded SOCs.
