linux-kernel - [PATCH v1 04/19] ACPICA: Interpret SIDP structures in DMAR

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Message-ID: <2239745.irdbgypaU6@rjwysocki.net>
Date: Fri, 25 Apr 2025 21:22:35 +0200
From: "Rafael J. Wysocki" <rjw@...ysocki.net>
To: Linux ACPI <linux-acpi@...r.kernel.org>
Cc: LKML <linux-kernel@...r.kernel.org>, Bob Moore <robert.moore@...el.com>,
 Saket Dumbre <saket.dumbre@...el.com>
Subject: [PATCH v1 04/19] ACPICA: Interpret SIDP structures in DMAR

From: Alexey Neyman <aneyman@...gle.com>

ACPICA commit af51f730e0bccf789686cea68e116d5f0b27aacb

Added in revision 3.4 of the VT-d spec. To support SIDP, part of the
previously reserved field in the device scope structure was used to
create a 1-byte "Flags" field.

Link: https://github.com/acpica/acpica/commit/af51f730
Signed-off-by: Alexey Neyman <aneyman@...gle.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---
 include/acpi/actbl1.h | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/include/acpi/actbl1.h b/include/acpi/actbl1.h
index 329454c303b9..e0cbda95fec8 100644
--- a/include/acpi/actbl1.h
+++ b/include/acpi/actbl1.h
@@ -819,7 +819,8 @@ enum acpi_dmar_type {
 	ACPI_DMAR_TYPE_HARDWARE_AFFINITY = 3,
 	ACPI_DMAR_TYPE_NAMESPACE = 4,
 	ACPI_DMAR_TYPE_SATC = 5,
-	ACPI_DMAR_TYPE_RESERVED = 6	/* 6 and greater are reserved */
+	ACPI_DMAR_TYPE_SIDP = 6,
+	ACPI_DMAR_TYPE_RESERVED = 7	/* 7 and greater are reserved */
 };
 
 /* DMAR Device Scope structure */
@@ -827,7 +828,8 @@ enum acpi_dmar_type {
 struct acpi_dmar_device_scope {
 	u8 entry_type;
 	u8 length;
-	u16 reserved;
+	u8 flags;
+	u8 reserved;
 	u8 enumeration_id;
 	u8 bus;
 };
@@ -923,6 +925,15 @@ struct acpi_dmar_satc {
 	u8 reserved;
 	u16 segment;
 };
+
+/* 6: so_c Integrated Device Property Reporting Structure */
+
+struct acpi_dmar_sidp {
+	struct acpi_dmar_header header;
+	u16 reserved;
+	u16 segment;
+};
+
 /*******************************************************************************
  *
  * DRTM - Dynamic Root of Trust for Measurement table
-- 
2.43.0