linux-kernel - Re: [RFC PATCH v3 02/16] cxl/acpi: Add an acpi

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Date:   Wed, 20 Jan 2021 11:27:21 -0800
From:   Dan Williams <dan.j.williams@...el.com>
To:     "Kaneda, Erik" <erik.kaneda@...el.com>
Cc:     Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        "Widawsky, Ben" <ben.widawsky@...el.com>,
        "linux-cxl@...r.kernel.org" <linux-cxl@...r.kernel.org>,
        "Verma, Vishal L" <vishal.l.verma@...el.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux PCI <linux-pci@...r.kernel.org>,
        "Weiny, Ira" <ira.weiny@...el.com>,
        "Kelley, Sean V" <sean.v.kelley@...el.com>,
        "Wysocki, Rafael J" <rafael.j.wysocki@...el.com>,
        Bjorn Helgaas <helgaas@...nel.org>,
        Jon Masters <jcm@...masters.org>,
        Chris Browy <cbrowy@...ry-design.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Christoph Hellwig <hch@...radead.org>,
        "daniel.lll@...baba-inc.com" <daniel.lll@...baba-inc.com>,
        "Moore, Robert" <robert.moore@...el.com>
Subject: Re: [RFC PATCH v3 02/16] cxl/acpi: Add an acpi_cxl module for the CXL interconnect

On Wed, Jan 13, 2021 at 9:55 AM Kaneda, Erik <erik.kaneda@...el.com> wrote:
[..]
> > The supplemental tables described here:
> >
> > https://www.uefi.org/acpi
> >
> > ...do eventually make there way into ACPICA. Added Bob and Erik in
> > case they can comment on when CEDT and CDAT support will be picked up.
>
> We would be happy to add support. I think Ben has reached out to me earlier about something like this but I haven’t had a chance to implement... Sorry about the delay.. How soon is the iASL/ACPICA support needed for CDAT and CDET?

CDAT and CEDT definitions in include/acpi/actbl* would be useful as
soon as v5.12. If that's too soon I don't think we're blocked, but the
driver is fast approaching the point where it needs to consult these
tables to enable higher order functionality.