Patch: Make ACPI subsystem provide CEDT table

From: Robert Kiraly <me@boldcoder.com>
To: linux-acpi@vger.kernel.org, linux-cxl@vger.kernel.org
Cc: Len Brown <lenb@kernel.org>,
	"Rafael J. Wysocki" <rafael@kernel.org>,
	Dan Williams <dan.j.williams@intel.com>
Subject: Patch: Make ACPI subsystem provide CEDT table
Date: Thu, 27 Jan 2022 02:15:23 -0800	[thread overview]
Message-ID: <a20337bb-9e83-e387-7d10-a2843f7286b3@boldcoder.com> (raw)
In-Reply-To: <82f254a1-c765-0a87-f017-8c07c8ef07cd@boldcoder.com>

This is a simple ACPI patch. I'm submitting a revised version to 
linux-acpi per Rafael Wysocki and linux-cxl per Dan Williams.

Thunderbird has added CRs so "patch -p1 -l" is needed.

==== start of patch ====
Subject: Make ACPI subsystem provide CEDT table
Signed-off-by: Robert Kiraly <me@boldcoder.com>

This is a simple patch to the ACPI subsystem. The patch adds ACPI
_SIG_CEDT to table_sigs[] in  "drivers/acpi/tables.c".

Presently,  CXL code isn't able to make use of the  CEDT table at
the initrd stage. Subsequent to the change, the CEDT table can be
used.

If  a developer  plans to use the CEDT table to  program  the CXL
ports,  this change is needed.  Otherwise,  it isn't  expected to
make a difference.

I certify  compliance with  Developer’s Certificate of Origin 1.1
as listed in:
https://www.kernel.org/doc/html/v4.10/process/submitting-patches.
html

--- linux-5.16.old/drivers/acpi/tables.c
+++ linux-5.16/drivers/acpi/tables.c
@@ -500,7 +500,7 @@
  	ACPI_SIG_WDDT, ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT,
  	ACPI_SIG_PSDT, ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT,
  	ACPI_SIG_IORT, ACPI_SIG_NFIT, ACPI_SIG_HMAT, ACPI_SIG_PPTT,
-	ACPI_SIG_NHLT };
+	ACPI_SIG_CEDT, ACPI_SIG_NHLT };

  #define ACPI_HEADER_SIZE sizeof(struct acpi_table_header)

==== end of patch ====

