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
  28 static Property cpu_cluster_properties[] = {
  29     DEFINE_PROP_UINT32("cluster-id", CPUClusterState, cluster_id, 0),
  30     DEFINE_PROP_END_OF_LIST()
  31 };
  32
  33 typedef struct CallbackData {
  34     CPUClusterState *cluster;
  35     int cpu_count;
  36 } CallbackData;
  37
  38 static 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
  50 static 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
  76 static 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
  87 static 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
  94 static void cpu_cluster_register_types(void)
  95 {
  96     type_register_static(&cpu_cluster_type_info);
  97 }
  98
  99 type_init(cpu_cluster_register_types)