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100 lines
2.8 KiB
C
100 lines
2.8 KiB
C
/*
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* QEMU CPU cluster
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*
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* Copyright (c) 2018 GreenSocs SAS
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see
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* <http://www.gnu.org/licenses/gpl-2.0.html>
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*/
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#include "qemu/osdep.h"
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#include "hw/core/cpu.h"
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#include "hw/cpu/cluster.h"
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#include "hw/qdev-properties.h"
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#include "qapi/error.h"
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static Property cpu_cluster_properties[] = {
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DEFINE_PROP_UINT32("cluster-id", CPUClusterState, cluster_id, 0),
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DEFINE_PROP_END_OF_LIST()
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};
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typedef struct CallbackData {
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CPUClusterState *cluster;
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int cpu_count;
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} CallbackData;
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static int add_cpu_to_cluster(Object *obj, void *opaque)
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{
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CallbackData *cbdata = opaque;
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CPUState *cpu = (CPUState *)object_dynamic_cast(obj, TYPE_CPU);
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if (cpu) {
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cpu->cluster_index = cbdata->cluster->cluster_id;
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cbdata->cpu_count++;
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}
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return 0;
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}
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static void cpu_cluster_realize(DeviceState *dev, Error **errp)
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{
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/* Iterate through all our CPU children and set their cluster_index */
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CPUClusterState *cluster = CPU_CLUSTER(dev);
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Object *cluster_obj = OBJECT(dev);
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CallbackData cbdata = {
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.cluster = cluster,
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.cpu_count = 0,
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};
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if (cluster->cluster_id >= MAX_CLUSTERS) {
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error_setg(errp, "cluster-id must be less than %d", MAX_CLUSTERS);
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return;
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}
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object_child_foreach_recursive(cluster_obj, add_cpu_to_cluster, &cbdata);
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/*
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* A cluster with no CPUs is a bug in the board/SoC code that created it;
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* if you hit this during development of new code, check that you have
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* created the CPUs and parented them into the cluster object before
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* realizing the cluster object.
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*/
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assert(cbdata.cpu_count > 0);
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}
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static void cpu_cluster_class_init(ObjectClass *klass, void *data)
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{
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DeviceClass *dc = DEVICE_CLASS(klass);
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device_class_set_props(dc, cpu_cluster_properties);
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dc->realize = cpu_cluster_realize;
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/* This is not directly for users, CPU children must be attached by code */
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dc->user_creatable = false;
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}
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static const TypeInfo cpu_cluster_type_info = {
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.name = TYPE_CPU_CLUSTER,
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.parent = TYPE_DEVICE,
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.instance_size = sizeof(CPUClusterState),
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.class_init = cpu_cluster_class_init,
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};
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static void cpu_cluster_register_types(void)
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{
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type_register_static(&cpu_cluster_type_info);
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}
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type_init(cpu_cluster_register_types)
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