linux-kernel - [PATCH v1 14/16] ACPICA: CEDT: Add Back-Invalidate restriction to CXL Window

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Message-ID: <2032933.yKVeVyVuyW@rafael.j.wysocki>
Date: Fri, 12 Sep 2025 22:04:04 +0200
From: "Rafael J. Wysocki" <rafael@...nel.org>
To: Linux ACPI <linux-acpi@...r.kernel.org>
Cc: LKML <linux-kernel@...r.kernel.org>,
 "Dumbre, Saket" <saket.dumbre@...el.com>
Subject:
 [PATCH v1 14/16] ACPICA: CEDT: Add Back-Invalidate restriction to CXL Window

From: Davidlohr Bueso <dave@...olabs.net>

This is added in newer version (3.0+) of the CXL Spec to support the
HDM-DB coherency model.

Link: https://github.com/acpica/acpica/commit/a6886da1
Signed-off-by: Davidlohr Bueso <dave@...olabs.net>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---
 include/acpi/actbl1.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/acpi/actbl1.h b/include/acpi/actbl1.h
index 99fd1588ff38..0b4c332df25c 100644
--- a/include/acpi/actbl1.h
+++ b/include/acpi/actbl1.h
@@ -565,6 +565,7 @@ struct acpi_cedt_cfmws_target_element {
 #define ACPI_CEDT_CFMWS_RESTRICT_VOLATILE   (1<<2)
 #define ACPI_CEDT_CFMWS_RESTRICT_PMEM       (1<<3)
 #define ACPI_CEDT_CFMWS_RESTRICT_FIXED      (1<<4)
+#define ACPI_CEDT_CFMWS_RESTRICT_BI         (1<<5)

 /* 2: CXL XOR Interleave Math Structure */

-- 
2.51.0