Re: [Xen-devel] [PATCH v2 2/4] xen/arm: Add GSER region to ThunderX platform mapping

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

On Thu, 2015-03-05 at 16:46 +0000, Ian Campbell wrote:
> On Wed, 2015-03-04 at 11:36 +0530, vijay.kilari@xxxxxxxxx wrote:
> > From: Vijaya Kumar K <Vijaya.Kumar@xxxxxxxxxxxxxxxxxx>
> > 
> > Add GSER region to thunderx platfrom specific mappings.
> > This region is not mentioned in DT. This is required by
> > PCI driver to detect and configure pci devices attached.
> > 
> > In future we can remove this mapping, if pci driver
> > in Dom does not require this.
> 
> How do we know what the PCI driver in dom0 needs? I don't think we can,
> so we can in effect never remove this specific mapping, which is a
> shame.
> 
> Unless you have some scheme in mind which would allow us to do so?
> 
> IMHO by far the best solution would be to add this device to the DTB so
> that it is correctly mapped. I'm not quite sure what that will look like
> since thne mainline DTB doesn't have the PCI node at all.

Looking at a more recent DTB which I have access to it seems like
0x87e090000000 is correctly covered by a ranges entry on the PCI
controller node.

So I think all which is needed is a) to use this updated DTB and b) my
series "xen: arm: Parse PCI DT nodes' ranges and interrupt-map" from
last October which, as it happens, I've been working on bringing up to
date yesterday and today (one more thing to clean up before I repost).

Ian.


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