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Date: Tue, 12 Jan 2021 22:06:28 +0000 From: Jonathan Cameron <Jonathan.Cameron@...wei.com> To: Dan Williams <dan.j.williams@...el.com> CC: Ben Widawsky <ben.widawsky@...el.com>, <linux-cxl@...r.kernel.org>, "Vishal Verma" <vishal.l.verma@...el.com>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Linux PCI <linux-pci@...r.kernel.org>, "linux-acpi@...r.kernel.org, Ira Weiny" <ira.weiny@...el.com>, "Kelley, Sean V" <sean.v.kelley@...el.com>, Rafael Wysocki <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>, "Moore, Robert" <robert.moore@...el.com>, "Kaneda, Erik" <erik.kaneda@...el.com> Subject: Re: [RFC PATCH v3 02/16] cxl/acpi: Add an acpi_cxl module for the CXL interconnect On Tue, 12 Jan 2021 11:43:31 -0800 Dan Williams <dan.j.williams@...el.com> wrote: > On Tue, Jan 12, 2021 at 10:44 AM Jonathan Cameron > <Jonathan.Cameron@...wei.com> wrote: > > > > On Mon, 11 Jan 2021 14:51:06 -0800 > > Ben Widawsky <ben.widawsky@...el.com> wrote: > > > > > From: Vishal Verma <vishal.l.verma@...el.com> > > > > > > Add an acpi_cxl module to coordinate the ACPI portions of the CXL > > > (Compute eXpress Link) interconnect. This driver binds to ACPI0017 > > > objects in the ACPI tree, and coordinates access to the resources > > > provided by the ACPI CEDT (CXL Early Discovery Table). > > > > > > It also coordinates operations of the root port _OSC object to notify > > > platform firmware that the OS has native support for the CXL > > > capabilities of endpoints. > > > > > > Note: the actbl1.h changes are speculative. The expectation is that they > > > will arrive through the ACPICA tree in due time. > > > > I would pull the ACPICA changes out into a precursor patch. > > > > > > > > > > Cc: Ben Widawsky <ben.widawsky@...el.com> > > > Cc: Dan Williams <dan.j.williams@...el.com> > > > Signed-off-by: Vishal Verma <vishal.l.verma@...el.com> > > > Signed-off-by: Ben Widawsky <ben.widawsky@...el.com> > > > > Hi, > > > > I think it would be good to also add CEDT to the list in drivers/acpi/tables.c > > so that we can dump it from /sys/firmware/acpi/tables/ and potentially > > override it from an initrd. > > ACPICA changes will eventually come through the ACPI tree not this patch set. That particular file isn't from ACPICA though I value in the entry will be. > > > > > > https://elixir.bootlin.com/linux/v5.11-rc3/source/drivers/acpi/tables.c#L482 > > Can be very helpful whilst debugging. Related to that, anyone know if anyone > > has acpica patches so we can have iasl -d work on the table? Would probably > > be useful but I'd rather not duplicate work if it's already done. > > > > 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. ...
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