hw/cpu: introduce CPU clusters

This commit adds the cpu-cluster type. It aims at gathering CPUs from
the same cluster in a machine.

For now it only has a `cluster-id` property.

Documentation in cluster.h written with the help of Peter Maydell.

Signed-off-by: Luc Michel <luc.michel@greensocs.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Tested-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
Message-id: 20181207090135.7651-2-luc.michel@greensocs.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

2 files changed, 51 insertions, 1 deletions

diff --git a/hw/cpu/Makefile.objs b/hw/cpu/Makefile.objs
index cd52d20b65..8db9e8a7b3 100644
--- a/hw/cpu/Makefile.objs
+++ b/hw/cpu/Makefile.objs
@@ -2,4 +2,4 @@ obj-$(CONFIG_ARM11MPCORE) += arm11mpcore.o
 obj-$(CONFIG_REALVIEW) += realview_mpcore.o
 obj-$(CONFIG_A9MPCORE) += a9mpcore.o
 obj-$(CONFIG_A15MPCORE) += a15mpcore.o
-common-obj-y += core.o
+common-obj-y += core.o cluster.o
diff --git a/hw/cpu/cluster.c b/hw/cpu/cluster.c
new file mode 100644
index 0000000000..9d50a235d5
--- /dev/null
+++ b/hw/cpu/cluster.c
@@ -0,0 +1,50 @@
+/*
+ * QEMU CPU cluster
+ *
+ * Copyright (c) 2018 GreenSocs SAS
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see
+ * <http://www.gnu.org/licenses/gpl-2.0.html>
+ */
+
+#include "qemu/osdep.h"
+#include "hw/cpu/cluster.h"
+#include "qapi/error.h"
+#include "qemu/module.h"
+
+static Property cpu_cluster_properties[] = {
+    DEFINE_PROP_UINT32("cluster-id", CPUClusterState, cluster_id, 0),
+    DEFINE_PROP_END_OF_LIST()
+};
+
+static void cpu_cluster_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+
+    dc->props = cpu_cluster_properties;
+}
+
+static const TypeInfo cpu_cluster_type_info = {
+    .name = TYPE_CPU_CLUSTER,
+    .parent = TYPE_DEVICE,
+    .instance_size = sizeof(CPUClusterState),
+    .class_init = cpu_cluster_class_init,
+};
+
+static void cpu_cluster_register_types(void)
+{
+    type_register_static(&cpu_cluster_type_info);
+}
+
+type_init(cpu_cluster_register_types)