Re: [RFC PATCH 3/6] PCI/AER: Enable RCEC to report internal error for CXL root port

[Dan Williams]

Li, Ming wrote:
> On 4/16/2024 10:46 PM, Terry Bowman wrote:
> > The driver support is much simpler if RCEC does not handle VH protocol errors. Is there 
> > a reason to forward root port VH mode protocol errors to an RCEC rather than consume 
> > in the root port's AER driver and forward to CXL error handler? 
> > 
> I agree that is simpler if only root port handle VH protocol errors,
> but I think that software has no chance to choose if VH protocol
> errors reported to RCEC or root port, it depends on platform
> implementation. So I think we should support both cases.

The question is whether the CXL spec RDPAS behavior causes any problems
for platforms that follow PCIe rather than CXL reporting flows for
root-port errors. I.e. does it cause problems if Linux starts scanning
root ports on RCEC notifications?

I do think the lookup needs to change to be based on CXL host-bridge
detection and not CXL-type-3 endpoint detection, but otherwise it looks
like CXL spec wants to invalidate PCIe spec expectations.