Re: [PATCH v3 9/9] cxl/acpi: Set ACPI's CXL _OSC to indicate CXL1.1 support

Bjorn Helgaas
2022-11-10T17:11:20Z

On Thu, Nov 10, 2022 at 12:51:02AM +0000, Verma, Vishal L wrote:
> On Wed, 2022-11-09 at 17:35 -0600, Bjorn Helgaas wrote:

> > I don't know the history, but OSC_CXL_1_1_PORT_REG_ACCESS_SUPPORT and
> > OSC_CXL_2_0_PORT_DEV_REG_ACCESS_SUPPORT seem like sort of weird names
> > since they don't match the spec at all ("RCD and RCH Port Register
> > Access Supported" and "CXL VH Register Access Supported").
>
> Ah the RCH/RCD and VH terminology was only introduced in the CXL-3.0
> spec. When the above defines were added, the spec was at 2.0, and it
> used the descriptions: "CXL 1.1 Port Register Access supported", and
> "CXL 2.0 Port/Device Register Access supported" (Table 217 in 2.0).

Haha, that's annoying :) I didn't dig back through the old versions.
I guess CXL folks can decide whether to keep the old names or update.