LXR qemu/hw/cpu/cluster.c

   1/*
   2 * QEMU CPU cluster
   3 *
   4 * Copyright (c) 2018 GreenSocs SAS
   5 *
   6 * This program is free software; you can redistribute it and/or
   7 * modify it under the terms of the GNU General Public License
   8 * as published by the Free Software Foundation; either version 2
   9 * of the License, or (at your option) any later version.
  10 *
  11 * This program is distributed in the hope that it will be useful,
  12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 * GNU General Public License for more details.
  15 *
  16 * You should have received a copy of the GNU General Public License
  17 * along with this program; if not, see
  18 * <http://www.gnu.org/licenses/gpl-2.0.html>
  19 */
  20
  21#include "qemu/osdep.h"
  22#include "hw/cpu/cluster.h"
  23#include "qom/cpu.h"
  24#include "qapi/error.h"
  25#include "qemu/module.h"
  26#include "qemu/cutils.h"
  27
  28static Property cpu_cluster_properties[] = {
  29    DEFINE_PROP_UINT32("cluster-id", CPUClusterState, cluster_id, 0),
  30    DEFINE_PROP_END_OF_LIST()
  31};
  32
  33typedef struct CallbackData {
  34    CPUClusterState *cluster;
  35    int cpu_count;
  36} CallbackData;
  37
  38static int add_cpu_to_cluster(Object *obj, void *opaque)
  39{
  40    CallbackData *cbdata = opaque;
  41    CPUState *cpu = (CPUState *)object_dynamic_cast(obj, TYPE_CPU);
  42
  43    if (cpu) {
  44        cpu->cluster_index = cbdata->cluster->cluster_id;
  45        cbdata->cpu_count++;
  46    }
  47    return 0;
  48}
  49
  50static void cpu_cluster_realize(DeviceState *dev, Error **errp)
  51{
  52    /* Iterate through all our CPU children and set their cluster_index */
  53    CPUClusterState *cluster = CPU_CLUSTER(dev);
  54    Object *cluster_obj = OBJECT(dev);
  55    CallbackData cbdata = {
  56        .cluster = cluster,
  57        .cpu_count = 0,
  58    };
  59
  60    if (cluster->cluster_id >= MAX_CLUSTERS) {
  61        error_setg(errp, "cluster-id must be less than %d", MAX_CLUSTERS);
  62        return;
  63    }
  64
  65    object_child_foreach_recursive(cluster_obj, add_cpu_to_cluster, &cbdata);
  66
  67    /*
  68     * A cluster with no CPUs is a bug in the board/SoC code that created it;
  69     * if you hit this during development of new code, check that you have
  70     * created the CPUs and parented them into the cluster object before
  71     * realizing the cluster object.
  72     */
  73    assert(cbdata.cpu_count > 0);
  74}
  75
  76static void cpu_cluster_class_init(ObjectClass *klass, void *data)
  77{
  78    DeviceClass *dc = DEVICE_CLASS(klass);
  79
  80    dc->props = cpu_cluster_properties;
  81    dc->realize = cpu_cluster_realize;
  82
  83    /* This is not directly for users, CPU children must be attached by code */
  84    dc->user_creatable = false;
  85}
  86
  87static const TypeInfo cpu_cluster_type_info = {
  88    .name = TYPE_CPU_CLUSTER,
  89    .parent = TYPE_DEVICE,
  90    .instance_size = sizeof(CPUClusterState),
  91    .class_init = cpu_cluster_class_init,
  92};
  93
  94static void cpu_cluster_register_types(void)
  95{
  96    type_register_static(&cpu_cluster_type_info);
  97}
  98
  99type_init(cpu_cluster_register_types)
 100