Re: [PATCH] PCI: add support for root bus sizing

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On Sat, Mar 14, 2020 at 12:44 PM Ivan Kokshaysky
<ink@xxxxxxxxxxxxxxxxxxxx> wrote:
>
> In certain cases we should be able to enumerate IO and MEM ranges
> of all PCI devices installed in the system, and then set respective
> host bridge apertures basing on calculated size and alignment.
> Particularly when firmware is broken and fails to assign bridge
> windows properly, like on Alpha UP1500 platform.
>
> Actually, almost everything is already in place, and required
> changes are minimal:
>
> - add "size_windows" flag to struct pci_host_bridge: when set, it
>   instructs __pci_bus_size_bridges() to continue with the root bus;
> - in the __pci_bus_size_bridges() path: add checks for bus->self,
>   as it can legitimately be null for the root bus.

Works great. Thanks Ivan!

Tested-by: Matt Turner <mattst88@xxxxxxxxx>



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