Re: [edk2-devel] [RFC PATCH edk2-platforms v4 0/1] add basic support for CXL on sbsa-ref

["Yuquan Wang" <wangyuquan1236@phytium.com.cn>]

On Thu, Dec 12, 2024 at 11:51:54AM +0800, Yuquan Wang wrote:
> On Wed, Dec 11, 2024 at 03:40:03PM +0000, Alejandro Lucero Palau wrote:
> > 
> > On 12/10/24 10:36, Yuquan Wang wrote:
> > > v3 -> v4:
> > > - Align base addresses of CXL relevant Windows
> > > 
> > > v2 -> v3:
> > > - PCDs values of pio, mmio32, mmio64 & ecam space for the independent cxl host
> > > - CXL Bus range: 0x00 ~ 0xff
> > > - Mcfg ecam structure for cxl
> > > - Iort RC node for cxl
> > > 
> > > RFC because
> > > - Many contents are ported from Jonathan' patch on qemu virt design
> > > 
> > > - Bring plenty of PCDs values
> > > 
> > > - Less experience and not particularly confident in ACPI area
> > > 
> > > This series leverages Jonathan's patches[1] to add acpi0016 & acpi0017 objects into the
> > > previous DSDT table of sbsa-ref. Since my latest acpi0016 implementation model on qemu
> > > side is a new host bridge qemu object rather than pxb-cxl, the cxl host(Segment 0001)
> > > would have its own ECAM sapce. Meanwhile, this adds exclusive pio, mmio32 & mmio64 space
> > > for cxl host.
> > 
> > 
> > Hi Yuquan,
> > 
> > 
> > Is there a roadmap for edk2 supporting other CXL features?
> > 
> Hi, Alejandro
> 
> Emmm. I have not find such edk2 roadmap (docs/webs/blog) yet. According to
> what I've learnd, the edk2 upstream only support some head files which
> define cxl registers structs and no cxl drivers have merged into upstream
> now, and mostly system software's work haved been done in linux kernel.
> 
> Regard to cxl patches in edk2, there is a series of patches in reviewing to
> support enabling cxl-type3 device as memory expander on Arm/RD platform[1].
> 
> Link:
> [1]: https://edk2.groups.io/g/devel/message/109488
> > 
> > I have noticed UEFI extensions are not supported yet, specifically
> > EFI_ADAPTER_INFO_CDAT_TYPE_GUID as an instance of
> > EFI_ADAPTER_INFORMATION_PROTOCOL.
> > 
> > 
> > Any feedback would be welcome.
> > 
> > 
> > Thanks
> > 
> > 
>
Hi, Jonathan & Ben

Recently I am trying to test EINJ for cxl error on sbsa-ref based on Ben
Cheatham's patches, but there seems no sample for cxl EINJ table in edk2.
Hence, I manage to write the EINJ table by what I have learnd in ACPI
SPEC, but I am struggling with which error injection actions need me to
build.

Do you know some limitations on this mechanism in QEMU or any suggestions?

Many thanks
Yuquan



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