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/*
* 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 "hw/qdev-properties.h"
#include "hw/core/cpu.h"
#include "qapi/error.h"
#include "qemu/module.h"
#include "qemu/cutils.h"
static Property cpu_cluster_properties[] = {
DEFINE_PROP_UINT32("cluster-id", CPUClusterState, cluster_id, 0),
DEFINE_PROP_END_OF_LIST()
};
typedef struct CallbackData {
CPUClusterState *cluster;
int cpu_count;
} CallbackData;
static int add_cpu_to_cluster(Object *obj, void *opaque)
{
CallbackData *cbdata = opaque;
CPUState *cpu = (CPUState *)object_dynamic_cast(obj, TYPE_CPU);
if (cpu) {
cpu->cluster_index = cbdata->cluster->cluster_id;
cbdata->cpu_count++;
}
return 0;
}
static void cpu_cluster_realize(DeviceState *dev, Error **errp)
{
/* Iterate through all our CPU children and set their cluster_index */
CPUClusterState *cluster = CPU_CLUSTER(dev);
Object *cluster_obj = OBJECT(dev);
CallbackData cbdata = {
.cluster = cluster,
.cpu_count = 0,
};
if (cluster->cluster_id >= MAX_CLUSTERS) {
error_setg(errp, "cluster-id must be less than %d", MAX_CLUSTERS);
return;
}
object_child_foreach_recursive(cluster_obj, add_cpu_to_cluster, &cbdata);
/*
* A cluster with no CPUs is a bug in the board/SoC code that created it;
* if you hit this during development of new code, check that you have
* created the CPUs and parented them into the cluster object before
* realizing the cluster object.
*/
assert(cbdata.cpu_count > 0);
}
static void cpu_cluster_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->props = cpu_cluster_properties;
dc->realize = cpu_cluster_realize;
/* This is not directly for users, CPU children must be attached by code */
dc->user_creatable = false;
}
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)
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