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> > + /* On all p2p platforms bus_offset is the same for all BARs */ > > + p2p->mem.bus_offset = > > + pci_bus_address(pdev, 0) - pci_resource_start(pdev, 0); > > But not all devices implement BAR0, nor is BAR0 necessarily in the > memory space, wouldn't this calculation be wrong if BAR0 were > unimplemented or an IO BAR? I think you are correct about this. > Even within memory BARs I can imagine different translations for 32 > vs 64 bit, prefetch vs non-prefetch, but per the comment I guess > we're excluding those. Thanks, Humm, I had thought it was consistent for the device, but I guess not: resource_list_for_each_entry(window, &bridge->windows) { if (resource_contains(window->res, res)) { offset = window->offset; Seems like each window can have its own offset. So the p2p should be made per-bar, and hold the bar index from the constructor.. Jason