linux-kernel - [PATCH 1/3] iommu/vt-d: Add new enum value and structure for SATC

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Date:   Tue,  2 Feb 2021 12:40:55 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     iommu@...ts.linux-foundation.org
Cc:     Yian Chen <yian.chen@...el.com>, Joerg Roedel <joro@...tes.org>,
        Ashok Raj <ashok.raj@...el.com>, linux-kernel@...r.kernel.org
Subject: [PATCH 1/3] iommu/vt-d: Add new enum value and structure for SATC

From: Yian Chen <yian.chen@...el.com>

Starting from Intel Platform VT-d v3.2, BIOS may provide new remapping
structure SATC for SOC integrated devices, according to section 8.8 of
Intel VT-d architecture specification v3.2. The SATC structure reports
a list of the devices that require SATC enabling via ATS capacity.

This patch introduces the new enum value and structure to represent the
remapping information. Kernel should parse the information from the
reporting structure and enable ATC for the devices as needed.

Signed-off-by: Yian Chen <yian.chen@...el.com>
---
 include/acpi/actbl1.h | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/include/acpi/actbl1.h b/include/acpi/actbl1.h
index 43549547ed3e..b7ca802b66d2 100644
--- a/include/acpi/actbl1.h
+++ b/include/acpi/actbl1.h
@@ -514,7 +514,8 @@ enum acpi_dmar_type {
 	ACPI_DMAR_TYPE_ROOT_ATS = 2,
 	ACPI_DMAR_TYPE_HARDWARE_AFFINITY = 3,
 	ACPI_DMAR_TYPE_NAMESPACE = 4,
-	ACPI_DMAR_TYPE_RESERVED = 5	/* 5 and greater are reserved */
+	ACPI_DMAR_TYPE_SATC = 5,
+	ACPI_DMAR_TYPE_RESERVED = 6	/* 5 and greater are reserved */
 };
 
 /* DMAR Device Scope structure */
@@ -607,6 +608,14 @@ struct acpi_dmar_andd {
 	char device_name[1];
 };
 
+/* 5: SOC Integrated Address Translation Cache Reporting Structure */
+
+struct acpi_dmar_satc {
+	struct acpi_dmar_header header;
+	u8 flags;
+	u8 reserved;
+	u16 segment;
+};
 /*******************************************************************************
  *
  * DRTM - Dynamic Root of Trust for Measurement table
-- 
2.25.1