[PATCH 2/3] PCI: ARM: add support for virtual PCI host controller

[Bjorn Helgaas]

On Wed, Feb 12, 2014 at 1:07 PM, Arnd Bergmann <arnd at arndb.de> wrote:
> On Wednesday 12 February 2014 12:43:13 Jason Gunthorpe wrote:
>> On Tue, Feb 11, 2014 at 11:42:52AM +0100, Arnd Bergmann wrote:
>>
>>
>> Still missing release_region..
>>
>> Thoughts on upstreamining these bits?
>
> Upstreaming them would be great. Patches look correct by inspection as well.
>
>> > Since the mvebu_pcie_setup() function seems very generic at this,
>> > we should probably try to factor out that code into a common
>> > helper, at least for arm64, but ideally shared with arm32
>> > as well.
>>
>> Yah, especially since people are not getting it completely right..
>>
>> But some of the trouble here is a lack of a generic pci host driver
>> structure, eg I have to pull the domain number out of the ARM32
>> specific structure ..
>
> I'm sure that Bjorn also has some plans of his own, but I think
> we should have a generic host driver structure and gradually move
> stuff into it from the architecture specific structs.

I don't have plans in this area right now, but I would definitely like
to migrate things like the domain, NUMA node, etc., into a generic
structure.

> Now there is a 'struct pci_host_bridge' that is used on some
> architectures already but not on ARM. It also contains a list
> of resource windows plus offsets, and there is a set of functions
> associated with it:
>
> pci_create_root_bus()
> pcibios_root_bridge_prepare()
>
> etc.
>
> Maybe all that's needed is to actually start using those on arm32?
>
>         Arnd
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