linux-kernel - Re: [PATCH v3 9/9] cxl/acpi: Set ACPI's CXL

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Message-ID: <20221110171055.GA627971@bhelgaas>
Date:   Thu, 10 Nov 2022 11:10:55 -0600
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     "Verma, Vishal L" <vishal.l.verma@...el.com>
Cc:     "rrichter@....com" <rrichter@....com>,
        "terry.bowman@....com" <terry.bowman@....com>,
        "Jiang, Dave" <dave.jiang@...el.com>,
        "rafael@...nel.org" <rafael@...nel.org>,
        "Schofield, Alison" <alison.schofield@...el.com>,
        "linux-cxl@...r.kernel.org" <linux-cxl@...r.kernel.org>,
        "lenb@...nel.org" <lenb@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Williams, Dan J" <dan.j.williams@...el.com>,
        "Weiny, Ira" <ira.weiny@...el.com>,
        "bwidawsk@...nel.org" <bwidawsk@...nel.org>,
        "Jonathan.Cameron@...wei.com" <Jonathan.Cameron@...wei.com>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        "dave@...olabs.net" <dave@...olabs.net>,
        "linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>
Subject: Re: [PATCH v3 9/9] cxl/acpi: Set ACPI's CXL _OSC to indicate CXL1.1
 support

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.