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hw/cpu: introduce CPU clusters

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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>
This commit is contained in:
Luc Michel 2019-01-07 15:23:45 +00:00 committed by Peter Maydell
parent 407e6ce7f1
commit 335d52f457
4 changed files with 111 additions and 1 deletions
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2
MAINTAINERS
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@ -1195,7 +1195,9 @@ M: Marcel Apfelbaum <marcel.apfelbaum@gmail.com>
S: Supported
F: hw/core/machine.c
F: hw/core/null-machine.c
F: hw/cpu/cluster.c
F: include/hw/boards.h
F: include/hw/cpu/cluster.h
T: git https://github.com/ehabkost/qemu.git machine-next
Xtensa Machines

2
hw/cpu/Makefile.objs
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@ -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

50
hw/cpu/cluster.c Normal file
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@ -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)

58
include/hw/cpu/cluster.h Normal file
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@ -0,0 +1,58 @@
/*
* 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>
*/
#ifndef HW_CPU_CLUSTER_H
#define HW_CPU_CLUSTER_H
#include "qemu/osdep.h"
#include "hw/qdev.h"
/*
* CPU Cluster type
*
* A cluster is a group of CPUs which are all identical and have the same view
* of the rest of the system. It is mainly an internal QEMU representation and
* does not necessarily match with the notion of clusters on the real hardware.
*
* If CPUs are not identical (for example, Cortex-A53 and Cortex-A57 CPUs in an
* Arm big.LITTLE system) they should be in different clusters. If the CPUs do
* not have the same view of memory (for example the main CPU and a management
* controller processor) they should be in different clusters.
*/
#define TYPE_CPU_CLUSTER "cpu-cluster"
#define CPU_CLUSTER(obj) \
OBJECT_CHECK(CPUClusterState, (obj), TYPE_CPU_CLUSTER)
/**
* CPUClusterState:
* @cluster_id: The cluster ID. This value is for internal use only and should
* not be exposed directly to the user or to the guest.
*
* State of a CPU cluster.
*/
typedef struct CPUClusterState {
/*< private >*/
DeviceState parent_obj;
/*< public >*/
uint32_t cluster_id;
} CPUClusterState;
#endif