> -----Original Message----- > From: Dan Williams <dan.j.williams@xxxxxxxxx> > Sent: Tuesday, January 12, 2021 11:44 AM > To: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx> > Cc: Widawsky, Ben <ben.widawsky@xxxxxxxxx>; linux-cxl@xxxxxxxxxxxxxxx; > Verma, Vishal L <vishal.l.verma@xxxxxxxxx>; Linux Kernel Mailing List <linux- > kernel@xxxxxxxxxxxxxxx>; Linux PCI <linux-pci@xxxxxxxxxxxxxxx>; Weiny, Ira > <ira.weiny@xxxxxxxxx>; Kelley, Sean V <sean.v.kelley@xxxxxxxxx>; Wysocki, > Rafael J <rafael.j.wysocki@xxxxxxxxx>; Bjorn Helgaas <helgaas@xxxxxxxxxx>; > Jon Masters <jcm@xxxxxxxxxxxxxx>; Chris Browy <cbrowy@avery- > design.com>; Randy Dunlap <rdunlap@xxxxxxxxxxxxx>; Christoph Hellwig > <hch@xxxxxxxxxxxxx>; daniel.lll@xxxxxxxxxxxxxxx; Moore, Robert > <robert.moore@xxxxxxxxx>; Kaneda, Erik <erik.kaneda@xxxxxxxxx> > Subject: Re: [RFC PATCH v3 02/16] cxl/acpi: Add an acpi_cxl module for the > CXL interconnect > > On Tue, Jan 12, 2021 at 10:44 AM Jonathan Cameron > <Jonathan.Cameron@xxxxxxxxxx> wrote: > > > > On Mon, 11 Jan 2021 14:51:06 -0800 > > Ben Widawsky <ben.widawsky@xxxxxxxxx> wrote: > > > > > From: Vishal Verma <vishal.l.verma@xxxxxxxxx> > > > > > > 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@xxxxxxxxx> > > > Cc: Dan Williams <dan.j.williams@xxxxxxxxx> > > > Signed-off-by: Vishal Verma <vishal.l.verma@xxxxxxxxx> > > > Signed-off-by: Ben Widawsky <ben.widawsky@xxxxxxxxx> > > > > 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. > > > > > > 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. 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? Erik
