Re: [PATCH v1 00/25] PCI: Request host bridge window resources

Arnd Bergmann
2016-06-07T13:25:46Z

On Tuesday, June 7, 2016 8:11:05 AM CEST Bjorn Helgaas wrote:
> >
> > What do you think is the correct behavior here, should the driver only
> > request the PIO range with parent=ioport_resource, or should it also
> > request the MMIO window for the I/O ports with parent=iomem_resource?
> > In the latter case, any idea how that can be generalized?
>
> I think it should request both because I think iomem_resource should
> contain everything in the memory map. This would be required if we ever
> did any significant reassignment of top-level devices, e.g., ACPI devices.

Ok. Should we try to pass the mmio resource for the I/O window to
the devm_request_pci_bus_resources() function along with the other
arguments then?

As far as I can tell, it should not go into the resource list
because it is not something the PCI core code should access the
way it handles the other resources.

Arnd