On 21-02-08 10:55:51, Jonathan Cameron wrote: > ... > > > > > > > > >> > > >>>> > > >>>> Just like you we feel what's most important is to have DOE supported > > >>>> so that > > >>>> UEFI and Linux kernel and drivers can progress. We're also > > >>>> contributing to > > >>>> writing compliance tests for the CXL Compliance Software Development > > >>>> WG. > > >>> > > >>> Great. > > >> > > >> Is anyone doing the kernel enabling for it? > > > > > > Planning to look at this but plenty of other things on my todo list if > > > someone > > > else gets to it first. > > > > > > Generic DOE support should be straight forward (the infrastructure). > > > Parsing CDAT also straight forward. > > > Doing something with the results is hard unless we just provide an > > > interface for > > > userspace to query them for a given device - or dump the table > > > (I think we do want to be able to that). > > > > > > What I'm really not sure on is how to handle NUMA domains that are > > > created late > > > in the kernel boot sequence. The ACPI flow is set up with the assumption > > > that we can get them from SRAT very early in boot. Need to figure out how > > > to > > > work around that. (e.g. preallocate a bunch of spare nodes for example > > > though that's > > > ugly). Note IIRC the kernel doesn't do runtime update of any of the ACPI > > > performance parameters yet (_SLI, _HMA) so there probably isn't any > > > infrastructure > > > that we can reuse. > > > > > > There is also the firmware based enumeration and description option (OS > > > not necessarily > > > aware of CXL) in which this is all up to EDK2 and the kernel gets it all > > > presented > > > as standard tables. > > > > Do we know who’s on this as part of the EDK2 development? It would be > > great if they could > > address the SRAT/HMAT generation from reading CDAT. EDK2 does address CXL > > 1.1 now. > > No idea who, if anyone, is looking at this currently. Perhaps ask on the > EDK2 list? > > Jonathan >
I did ping the folks at #edk2 in OFTC a few months back and got basically no response. Mailing list might be best though. > > > > > > > > As you can perhaps tell from my half done reviews, this week disappeared > > > in > > > other things so bit of catch up for me to do next week. > > > > > > Thanks, > > > > > > Joanthan > > > > ... >
