[RFC 23/41] hw/cpu/die: Abstract cpu-die level as topology device

[Zhao Liu <zhao1.liu@xxxxxxxxxxxxxxx>]

From: Zhao Liu <zhao1.liu@xxxxxxxxx>

Abstract die level as a topology device "cpu-die" to allow user to
create die level topology from cli and later the cpu-dies could be added
into topology tree.

In addition, mark the cpu-die as DEVICE_CATEGORY_CPU_DEF category to
indicate it belongs to the basic CPU definition and should be created
from cli before board initialization.

Signed-off-by: Zhao Liu <zhao1.liu@xxxxxxxxx>
---
 MAINTAINERS          |  2 ++
 hw/cpu/die.c         | 46 ++++++++++++++++++++++++++++++++++++++++++++
 hw/cpu/meson.build   |  2 +-
 include/hw/cpu/die.h | 38 ++++++++++++++++++++++++++++++++++++
 4 files changed, 87 insertions(+), 1 deletion(-)
 create mode 100644 hw/cpu/die.c
 create mode 100644 include/hw/cpu/die.h

diff --git a/MAINTAINERS b/MAINTAINERS
index 89e350866d6a..91d0936edb32 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1863,6 +1863,7 @@ F: hw/core/machine-smp.c
 F: hw/core/null-machine.c
 F: hw/core/numa.c
 F: hw/cpu/cluster.c
+F: hw/cpu/die.c
 F: qapi/machine.json
 F: qapi/machine-common.json
 F: qapi/machine-target.json
@@ -1870,6 +1871,7 @@ F: include/hw/boards.h
 F: include/hw/core/cpu.h
 F: include/hw/core/cpu-topo.h
 F: include/hw/cpu/cluster.h
+F: include/hw/cpu/die.h
 F: include/sysemu/numa.h
 F: tests/unit/test-smp-parse.c
 T: git https://gitlab.com/ehabkost/qemu.git machine-next
diff --git a/hw/cpu/die.c b/hw/cpu/die.c
new file mode 100644
index 000000000000..06c4f7cc8fa2
--- /dev/null
+++ b/hw/cpu/die.c
@@ -0,0 +1,46 @@
+/*
+ * CPU die abstract device
+ *
+ * Copyright (c) 2023 Intel Corporation
+ * Author: Zhao Liu <zhao1.liu@xxxxxxxxx>
+ *
+ * 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/>.
+ */
+
+#include "qemu/osdep.h"
+#include "hw/cpu/die.h"
+
+static void cpu_die_class_init(ObjectClass *oc, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(oc);
+    CPUTopoClass *tc = CPU_TOPO_CLASS(oc);
+
+    set_bit(DEVICE_CATEGORY_CPU_DEF, dc->categories);
+
+    tc->level = CPU_TOPO_DIE;
+}
+
+static const TypeInfo cpu_die_type_info = {
+    .name = TYPE_CPU_DIE,
+    .parent = TYPE_CPU_TOPO,
+    .class_init = cpu_die_class_init,
+    .instance_size = sizeof(CPUDie),
+};
+
+static void cpu_die_register_types(void)
+{
+    type_register_static(&cpu_die_type_info);
+}
+
+type_init(cpu_die_register_types)
diff --git a/hw/cpu/meson.build b/hw/cpu/meson.build
index 6d319947ca0b..e685fe1c7d8a 100644
--- a/hw/cpu/meson.build
+++ b/hw/cpu/meson.build
@@ -1,4 +1,4 @@
-system_ss.add(files('core.c', 'cluster.c'))
+system_ss.add(files('core.c', 'cluster.c', 'die.c'))
 
 system_ss.add(when: 'CONFIG_ARM11MPCORE', if_true: files('arm11mpcore.c'))
 system_ss.add(when: 'CONFIG_REALVIEW', if_true: files('realview_mpcore.c'))
diff --git a/include/hw/cpu/die.h b/include/hw/cpu/die.h
new file mode 100644
index 000000000000..4c68786b5f2f
--- /dev/null
+++ b/include/hw/cpu/die.h
@@ -0,0 +1,38 @@
+/*
+ * CPU die abstract device
+ *
+ * Copyright (c) 2023 Intel Corporation
+ * Author: Zhao Liu <zhao1.liu@xxxxxxxxx>
+ *
+ * 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/>.
+ */
+
+#ifndef HW_CPU_DIE_H
+#define HW_CPU_DIE_H
+
+#include "hw/core/cpu-topo.h"
+#include "hw/qdev-core.h"
+
+#define TYPE_CPU_DIE "cpu-die"
+
+OBJECT_DECLARE_SIMPLE_TYPE(CPUDie, CPU_DIE)
+
+struct CPUDie {
+    /*< private >*/
+    CPUTopoState obj;
+
+    /*< public >*/
+};
+
+#endif /* HW_CPU_DIE_H */
-- 
2.34.1