[Xen-devel] [PATCH V2 7/25] tools/libacpi: Add new fields in acpi_config for 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.
New fields are introduces for DMAR table. These new fields are set by
toolstack through parsing guest's config file. construct_dmar() is added to
build DMAR table according to the new fields.

Signed-off-by: Chao Gao <chao.gao@xxxxxxxxx>
Signed-off-by: Lan Tianyu <tianyu.lan@xxxxxxxxx>
---
 tools/libacpi/build.c   | 57 +++++++++++++++++++++++++++++++++++++++++++++++++
 tools/libacpi/libacpi.h |  9 ++++++++
 2 files changed, 66 insertions(+)

diff --git a/tools/libacpi/build.c b/tools/libacpi/build.c
index f9881c9..c7cc784 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 +307,59 @@ static struct acpi_20_slit *construct_slit(struct 
acpi_ctxt *ctxt,
     return slit;
 }
 
+/*
+ * Only one DMA remapping hardware unit is exposed and all devices
+ * are under the remapping hardware unit. I/O APIC should be explicitly
+ * enumerated.
+ */
+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;
+    if ( config->iommu_intremap_supported )
+        dmar->flags = ACPI_DMAR_INTR_REMAP;
+    if ( !config->iommu_x2apic_supported )
+        dmar->flags |= ACPI_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->base_address = config->iommu_base_addr;
+
+    scope = &drhd->scope[0];
+    scope->type = ACPI_DMAR_DEVICE_SCOPE_IOAPIC;
+    scope->length = ioapic_scope_size;
+    scope->enumeration_id = config->ioapic_id;
+    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..74778a5 100644
--- a/tools/libacpi/libacpi.h
+++ b/tools/libacpi/libacpi.h
@@ -20,6 +20,8 @@
 #ifndef __LIBACPI_H__
 #define __LIBACPI_H__
 
+#include <stdbool.h>
+
 #define ACPI_HAS_COM1              (1<<0)
 #define ACPI_HAS_COM2              (1<<1)
 #define ACPI_HAS_LPT1              (1<<2)
@@ -96,8 +98,15 @@ struct acpi_config {
     uint32_t ioapic_base_address;
     uint16_t pci_isa_irq_mask;
     uint8_t ioapic_id;
+
+    /* Emulated IOMMU features and location */
+    bool iommu_intremap_supported;
+    bool iommu_x2apic_supported;
+    uint64_t iommu_base_addr;
 };
 
+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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