[Xen-devel] [RFC PATCH V2 8/26] Tools/libacpi: Add new fields in acpi_config to build DMAR table

[Lan Tianyu <tianyu.lan@xxxxxxxxx>]

From: Chao Gao <chao.gao@xxxxxxxxx>

The BIOS reports the remapping hardware units in a platform to system software
through the DMA Remapping Reporting (DMAR) ACPI table.

To build DMAR table during domain construction, two fields are added to struct
acpi_config. One is dmar_flag which indicates whether interrupt remapping is
supported and whether enabling X2APIC mode is premitted. The other is the base
address of remapping hardware register-set for a remapping unit. Also, a
function construct_dmar() is added to build DMAR table according the two
fields.

Signed-off-by: Chao Gao <chao.gao@xxxxxxxxx>
Signed-off-by: Lan Tianyu <tianyu.lan@xxxxxxxxx>
---
 tools/libacpi/build.c   | 53 +++++++++++++++++++++++++++++++++++++++++++++++++
 tools/libacpi/libacpi.h | 11 ++++++++++
 2 files changed, 64 insertions(+)

diff --git a/tools/libacpi/build.c b/tools/libacpi/build.c
index f9881c9..d5bedfd 100644
--- a/tools/libacpi/build.c
+++ b/tools/libacpi/build.c
@@ -28,6 +28,10 @@
 
 #define ACPI_MAX_SECONDARY_TABLES 16
 
+#define VTD_HOST_ADDRESS_WIDTH 39
+#define I440_PSEUDO_BUS_PLATFORM 0xff
+#define I440_PSEUDO_DEVFN_IOAPIC 0x0
+
 #define align16(sz)        (((sz) + 15) & ~15)
 #define fixed_strcpy(d, s) strncpy((d), (s), sizeof(d))
 
@@ -303,6 +307,55 @@ static struct acpi_20_slit *construct_slit(struct 
acpi_ctxt *ctxt,
     return slit;
 }
 
+struct acpi_dmar *construct_dmar(struct acpi_ctxt *ctxt,
+                                 const struct acpi_config *config)
+{
+    struct acpi_dmar *dmar;
+    struct acpi_dmar_hardware_unit *drhd;
+    struct dmar_device_scope *scope;
+    unsigned int size;
+    unsigned int ioapic_scope_size = sizeof(*scope) + sizeof(scope->path[0]);
+
+    size = sizeof(*dmar) + sizeof(*drhd) + ioapic_scope_size;
+
+    dmar = ctxt->mem_ops.alloc(ctxt, size, 16);
+    if ( !dmar )
+        return NULL;
+
+    memset(dmar, 0, size);
+    dmar->header.signature = ACPI_2_0_DMAR_SIGNATURE;
+    dmar->header.revision = ACPI_2_0_DMAR_REVISION;
+    dmar->header.length = size;
+    fixed_strcpy(dmar->header.oem_id, ACPI_OEM_ID);
+    fixed_strcpy(dmar->header.oem_table_id, ACPI_OEM_TABLE_ID);
+    dmar->header.oem_revision = ACPI_OEM_REVISION;
+    dmar->header.creator_id   = ACPI_CREATOR_ID;
+    dmar->header.creator_revision = ACPI_CREATOR_REVISION;
+    dmar->host_address_width = VTD_HOST_ADDRESS_WIDTH - 1;
+    dmar->flags = config->dmar_flag & (DMAR_INTR_REMAP|DMAR_X2APIC_OPT_OUT);
+
+    drhd = (struct acpi_dmar_hardware_unit *)((void*)dmar + sizeof(*dmar));
+    drhd->type = ACPI_DMAR_TYPE_HARDWARE_UNIT;
+    drhd->length = sizeof(*drhd) + ioapic_scope_size;
+    drhd->flags = ACPI_DMAR_INCLUDE_PCI_ALL;
+    drhd->pci_segment = 0;
+    drhd->address = config->viommu_base_addr;
+
+    scope = &drhd->scope[0];
+    scope->type = ACPI_DMAR_DEVICE_SCOPE_IOAPIC;
+    scope->length = ioapic_scope_size;
+    /*
+     * This field provides the I/O APICID as provided in the I/O APIC structure
+     * in the ACPI MADT (Multiple APIC Descriptor Table).
+     */
+    scope->enumeration_id = 1;
+    scope->bus = I440_PSEUDO_BUS_PLATFORM;
+    scope->path[0] = I440_PSEUDO_DEVFN_IOAPIC;
+
+    set_checksum(dmar, offsetof(struct acpi_header, checksum), size);
+    return dmar;
+}
+
 static int construct_passthrough_tables(struct acpi_ctxt *ctxt,
                                         unsigned long *table_ptrs,
                                         int nr_tables,
diff --git a/tools/libacpi/libacpi.h b/tools/libacpi/libacpi.h
index 2ed1ecf..6a4e1cf 100644
--- a/tools/libacpi/libacpi.h
+++ b/tools/libacpi/libacpi.h
@@ -20,6 +20,8 @@
 #ifndef __LIBACPI_H__
 #define __LIBACPI_H__
 
+#include "acpi2_0.h"
+
 #define ACPI_HAS_COM1              (1<<0)
 #define ACPI_HAS_COM2              (1<<1)
 #define ACPI_HAS_LPT1              (1<<2)
@@ -36,6 +38,7 @@
 #define ACPI_HAS_8042              (1<<13)
 #define ACPI_HAS_CMOS_RTC          (1<<14)
 #define ACPI_HAS_SSDT_LAPTOP_SLATE (1<<15)
+#define ACPI_HAS_DMAR              (1<<16)
 
 struct xen_vmemrange;
 struct acpi_numa {
@@ -96,8 +99,16 @@ struct acpi_config {
     uint32_t ioapic_base_address;
     uint16_t pci_isa_irq_mask;
     uint8_t ioapic_id;
+
+    /* dmar info */
+    uint8_t dmar_flag;
+    uint64_t viommu_base_addr;
 };
 
+#define DMAR_INTR_REMAP 0x1
+#define DMAR_X2APIC_OPT_OUT 0x2
+struct acpi_dmar *construct_dmar(struct acpi_ctxt *ctxt,
+                                 const struct acpi_config *config);
 int acpi_build_tables(struct acpi_ctxt *ctxt, struct acpi_config *config);
 
 #endif /* __LIBACPI_H__ */
-- 
1.8.3.1


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