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 23 #include "hw/core/cpu.h" 24 #include "hw/cpu/cluster.h" 25 #include "hw/qdev-properties.h" 26 #include "qapi/error.h" 27 28 static const Property cpu_cluster_properties[] = { 29 DEFINE_PROP_UINT32("cluster-id", CPUClusterState, cluster_id, 0), 30 }; 31 32 typedef struct CallbackData { 33 CPUClusterState *cluster; 34 int cpu_count; 35 } CallbackData; 36 37 static int add_cpu_to_cluster(Object *obj, void *opaque) 38 { 39 CallbackData *cbdata = opaque; 40 CPUState *cpu = (CPUState *)object_dynamic_cast(obj, TYPE_CPU); 41 42 if (cpu) { 43 cpu->cluster_index = cbdata->cluster->cluster_id; 44 cbdata->cpu_count++; 45 } 46 return 0; 47 } 48 49 static void cpu_cluster_realize(DeviceState *dev, Error **errp) 50 { 51 /* Iterate through all our CPU children and set their cluster_index */ 52 CPUClusterState *cluster = CPU_CLUSTER(dev); 53 Object *cluster_obj = OBJECT(dev); 54 CallbackData cbdata = { 55 .cluster = cluster, 56 .cpu_count = 0, 57 }; 58 59 if (cluster->cluster_id >= MAX_CLUSTERS) { 60 error_setg(errp, "cluster-id must be less than %d", MAX_CLUSTERS); 61 return; 62 } 63 64 object_child_foreach_recursive(cluster_obj, add_cpu_to_cluster, &cbdata); 65 66 /* 67 * A cluster with no CPUs is a bug in the board/SoC code that created it; 68 * if you hit this during development of new code, check that you have 69 * created the CPUs and parented them into the cluster object before 70 * realizing the cluster object. 71 */ 72 assert(cbdata.cpu_count > 0); 73 } 74 75 static void cpu_cluster_class_init(ObjectClass *klass, void *data) 76 { 77 DeviceClass *dc = DEVICE_CLASS(klass); 78 79 device_class_set_props(dc, cpu_cluster_properties); 80 dc->realize = cpu_cluster_realize; 81 82 /* This is not directly for users, CPU children must be attached by code */ 83 dc->user_creatable = false; 84 } 85 86 static const TypeInfo cpu_cluster_type_info = { 87 .name = TYPE_CPU_CLUSTER, 88 .parent = TYPE_DEVICE, 89 .instance_size = sizeof(CPUClusterState), 90 .class_init = cpu_cluster_class_init, 91 }; 92 93 static void cpu_cluster_register_types(void) 94 { 95 type_register_static(&cpu_cluster_type_info); 96 } 97 98 type_init(cpu_cluster_register_types) 99