Re: [PATCH v1 23/29] cxl/region: Use root decoders interleaving parameters to create a region

[Robert Richter]

On 13.01.25 09:48:47, Alison Schofield wrote:
> On Tue, Jan 07, 2025 at 03:10:09PM +0100, Robert Richter wrote:
> > Endpoints requiring address translation might not be aware of the
> > system's interleaving configuration. Instead, interleaving can be
> > configured on an upper memory domain (from an endpoint view) and thus
> > is not visible to the endpoint. For region creation this might cause
> > an invalid interleaving config that does not match the CFMWS entries.
> > 
> > Use the interleaving configuration of the root decoders to create a
> > region which bases on CFMWS entries. This always matches the system's
> > interleaving configuration and is independent of the underlying memory
> > topology.
> 
> This sounds like a restriction, more restrictive than present.
> 
> Won't it block all region interleave ways greater than root decoder
> interleave ways? ie. disallows 2, 2+2, 2+2+2, 4, etc.

Yes, a combination of all decoders from the endpoint up to the root
result in the interleaving config. This will be fixed in the next
version.

Thanks for catching this,

-Robert