[PATCH 1/2] arm/acpi: TPM2 ACPI table support

[Eric Auger <eric.auger@redhat.com>]

Add a TPM2 ACPI table if a TPM2.0 sysbus device has been
dynamically instantiated.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
---
 include/sysemu/tpm.h     |  2 ++
 hw/arm/virt-acpi-build.c | 36 ++++++++++++++++++++++++++++++++++++
 2 files changed, 38 insertions(+)

diff --git a/include/sysemu/tpm.h b/include/sysemu/tpm.h
index f37851b1aa..03fb25941c 100644
--- a/include/sysemu/tpm.h
+++ b/include/sysemu/tpm.h
@@ -50,6 +50,8 @@ typedef struct TPMIfClass {
 
 #define TPM_IS_TIS_ISA(chr)                         \
     object_dynamic_cast(OBJECT(chr), TYPE_TPM_TIS_ISA)
+#define TPM_IS_TIS_SYSBUS(chr)                      \
+    object_dynamic_cast(OBJECT(chr), TYPE_TPM_TIS_SYSBUS)
 #define TPM_IS_CRB(chr)                             \
     object_dynamic_cast(OBJECT(chr), TYPE_TPM_CRB)
 #define TPM_IS_SPAPR(chr)                           \
diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c
index 81d41a3990..cc5863eaf2 100644
--- a/hw/arm/virt-acpi-build.c
+++ b/hw/arm/virt-acpi-build.c
@@ -41,11 +41,13 @@
 #include "hw/acpi/pci.h"
 #include "hw/acpi/memory_hotplug.h"
 #include "hw/acpi/generic_event_device.h"
+#include "hw/acpi/tpm.h"
 #include "hw/pci/pcie_host.h"
 #include "hw/pci/pci.h"
 #include "hw/arm/virt.h"
 #include "sysemu/numa.h"
 #include "sysemu/reset.h"
+#include "sysemu/tpm.h"
 #include "kvm_arm.h"
 #include "migration/vmstate.h"
 
@@ -704,6 +706,35 @@ static void build_fadt_rev5(GArray *table_data, BIOSLinker *linker,
     build_fadt(table_data, linker, &fadt, NULL, NULL);
 }
 
+static void
+build_tpm2(GArray *table_data, BIOSLinker *linker, GArray *tcpalog)
+{
+    Acpi20TPM2 *tpm2_ptr = acpi_data_push(table_data, sizeof *tpm2_ptr);
+    unsigned log_addr_size = sizeof(tpm2_ptr->log_area_start_address);
+    unsigned log_addr_offset =
+        (char *)&tpm2_ptr->log_area_start_address - table_data->data;
+
+    tpm2_ptr->platform_class = cpu_to_le16(TPM2_ACPI_CLASS_CLIENT);
+    if (TPM_IS_TIS_SYSBUS(tpm_find())) {
+        tpm2_ptr->control_area_address = cpu_to_le64(0);
+        tpm2_ptr->start_method = cpu_to_le32(TPM2_START_METHOD_MMIO);
+    } else {
+        g_warn_if_reached();
+    }
+
+    tpm2_ptr->log_area_minimum_length = cpu_to_le32(TPM_LOG_AREA_MINIMUM_SIZE);
+    acpi_data_push(tcpalog, le32_to_cpu(tpm2_ptr->log_area_minimum_length));
+
+    /* log area start address to be filled by Guest linker */
+    bios_linker_loader_alloc(linker, ACPI_BUILD_TPMLOG_FILE,
+                             tcpalog, 1, false);
+    bios_linker_loader_add_pointer(linker, ACPI_BUILD_TABLE_FILE,
+                                   log_addr_offset, log_addr_size,
+                                   ACPI_BUILD_TPMLOG_FILE, 0);
+    build_header(linker, table_data,
+                 (void *)tpm2_ptr, "TPM2", sizeof(*tpm2_ptr), 4, NULL, NULL);
+}
+
 /* DSDT */
 static void
 build_dsdt(GArray *table_data, BIOSLinker *linker, VirtMachineState *vms)
@@ -831,6 +862,11 @@ void virt_acpi_build(VirtMachineState *vms, AcpiBuildTables *tables)
         build_iort(tables_blob, tables->linker, vms);
     }
 
+    if (tpm_get_version(tpm_find()) == TPM_VERSION_2_0) {
+        acpi_add_table(table_offsets, tables_blob);
+        build_tpm2(tables_blob, tables->linker, tables->tcpalog);
+    }
+
     /* XSDT is pointed to by RSDP */
     xsdt = tables_blob->len;
     build_xsdt(tables_blob, tables->linker, table_offsets, NULL, NULL);
-- 
2.20.1