From: Don Dutile <ddutile@redhat.com>
Date: Fri, 24 Apr 2009 14:40:08 -0400
Subject: [misc] VT-d: add DMAR ACPI table support
Message-id: 49F20788.7050907@redhat.com
O-Subject: [RHEL5.4 PATCH 3/6] VT-d for KVM: Add DMAR (Intel VT-d IOMMU) ACPI table support
Bugzilla: 480411
RH-Acked-by: Rik van Riel <riel@redhat.com>
RH-Acked-by: Chris Wright <chrisw@redhat.com>

BZ 480411

Add DMAR (Intel VT-d IOMMU) ACPI table support.

Intel VT-d hw support is triggered by the presence of
the DMAR ACPI table.  The setup of the IOMMU and
the association of PCI devices to its respective IOMMU
is also driven by this ACPI table.

Please review & ACK.

- Don

>From c4e90517d07f768366fbbbd93b8681e0ee1782e3 Mon Sep 17 00:00:00 2001
From: Mark McLoughlin <markmc@redhat.com>
Date: Mon, 17 Nov 2008 19:42:53 +0000
Subject: [PATCH 3/6] vt-d: add DMAR ACPI table structure definitions

Taken from upstream commit:

  2502fff ACPICA: Add support for DMAR table

Signed-off-by: Mark McLoughlin <markmc@redhat.com>

diff --git a/include/acpi/actbl1.h b/include/acpi/actbl1.h
index 745a644..b0e9536 100644
--- a/include/acpi/actbl1.h
+++ b/include/acpi/actbl1.h
@@ -61,6 +61,7 @@
 #define ACPI_SIG_BOOT           "BOOT"	/* Simple Boot Flag Table */
 #define ACPI_SIG_CPEP           "CPEP"	/* Corrected Platform Error Polling table */
 #define ACPI_SIG_DBGP           "DBGP"	/* Debug Port table */
+#define ACPI_SIG_DMAR           "DMAR"	/* DMA Remapping table */
 #define ACPI_SIG_ECDT           "ECDT"	/* Embedded Controller Boot Resources Table */
 #define ACPI_SIG_HPET           "HPET"	/* High Precision Event Timer table */
 #define ACPI_SIG_MADT           "APIC"	/* Multiple APIC Description Table */
@@ -216,6 +217,95 @@ struct acpi_table_dbgp {
 
 /*******************************************************************************
  *
+ * DMAR - DMA Remapping table
+ *
+ ******************************************************************************/
+
+struct acpi_table_dmar {
+	struct acpi_table_header header;	/* Common ACPI table header */
+	u8 width;		/* Host Address Width */
+	u8 flags;
+	u8 reserved[10];
+};
+
+/* Flags */
+
+#define ACPI_DMAR_INTR_REMAP	    (1)
+
+/* DMAR subtable header */
+
+struct acpi_dmar_header {
+	u16 type;
+	u16 length;
+};
+
+/* Values for subtable type in struct acpi_dmar_header */
+
+enum acpi_dmar_type {
+	ACPI_DMAR_TYPE_HARDWARE_UNIT = 0,
+	ACPI_DMAR_TYPE_RESERVED_MEMORY = 1,
+	ACPI_DMAR_TYPE_ATSR = 2,
+	ACPI_DMAR_TYPE_RESERVED = 3	/* 3 and greater are reserved */
+};
+
+struct acpi_dmar_device_scope {
+	u8 entry_type;
+	u8 length;
+	u16 reserved;
+	u8 enumeration_id;
+	u8 bus;
+};
+
+/* Values for entry_type in struct acpi_dmar_device_scope */
+
+enum acpi_dmar_scope_type {
+	ACPI_DMAR_SCOPE_TYPE_NOT_USED = 0,
+	ACPI_DMAR_SCOPE_TYPE_ENDPOINT = 1,
+	ACPI_DMAR_SCOPE_TYPE_BRIDGE = 2,
+	ACPI_DMAR_SCOPE_TYPE_IOAPIC = 3,
+	ACPI_DMAR_SCOPE_TYPE_HPET = 4,
+	ACPI_DMAR_SCOPE_TYPE_RESERVED = 5	/* 5 and greater are reserved */
+};
+
+struct acpi_dmar_pci_path {
+	u8 dev;
+	u8 fn;
+};
+
+/*
+ * DMAR Sub-tables, correspond to Type in struct acpi_dmar_header
+ */
+
+/* 0: Hardware Unit Definition */
+
+struct acpi_dmar_hardware_unit {
+	struct acpi_dmar_header header;
+	u8 flags;
+	u8 reserved;
+	u16 segment;
+	u64 address;		/* Register Base Address */
+};
+
+/* Flags */
+
+#define ACPI_DMAR_INCLUDE_ALL       (1)
+
+/* 1: Reserved Memory Defininition */
+
+struct acpi_dmar_reserved_memory {
+	struct acpi_dmar_header header;
+	u16 reserved;
+	u16 segment;
+	u64 base_address;		/* 4_k aligned base address */
+	u64 end_address;	/* 4_k aligned limit address */
+};
+
+/* Flags */
+
+#define ACPI_DMAR_ALLOW_ALL         (1)
+
+/*******************************************************************************
+ *
  * ECDT - Embedded Controller Boot Resources Table
  *
  ******************************************************************************/