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 "hw/qdev-properties.h" 24 #include "hw/core/cpu.h" 25 #include "qapi/error.h" 26 #include "qemu/module.h" 27 #include "qemu/cutils.h" 28 29 static Property cpu_cluster_properties[] = { 30 DEFINE_PROP_UINT32("cluster-id", CPUClusterState, cluster_id, 0), 31 DEFINE_PROP_END_OF_LIST() 32 }; 33 34 typedef struct CallbackData { 35 CPUClusterState *cluster; 36 int cpu_count; 37 } CallbackData; 38 39 static int add_cpu_to_cluster(Object *obj, void *opaque) 40 { 41 CallbackData *cbdata = opaque; 42 CPUState *cpu = (CPUState *)object_dynamic_cast(obj, TYPE_CPU); 43 44 if (cpu) { 45 cpu->cluster_index = cbdata->cluster->cluster_id; 46 cbdata->cpu_count++; 47 } 48 return 0; 49 } 50 51 static void cpu_cluster_realize(DeviceState *dev, Error **errp) 52 { 53 /* Iterate through all our CPU children and set their cluster_index */ 54 CPUClusterState *cluster = CPU_CLUSTER(dev); 55 Object *cluster_obj = OBJECT(dev); 56 CallbackData cbdata = { 57 .cluster = cluster, 58 .cpu_count = 0, 59 }; 60 61 if (cluster->cluster_id >= MAX_CLUSTERS) { 62 error_setg(errp, "cluster-id must be less than %d", MAX_CLUSTERS); 63 return; 64 } 65 66 object_child_foreach_recursive(cluster_obj, add_cpu_to_cluster, &cbdata); 67 68 /* 69 * A cluster with no CPUs is a bug in the board/SoC code that created it; 70 * if you hit this during development of new code, check that you have 71 * created the CPUs and parented them into the cluster object before 72 * realizing the cluster object. 73 */ 74 assert(cbdata.cpu_count > 0); 75 } 76 77 static void cpu_cluster_class_init(ObjectClass *klass, void *data) 78 { 79 DeviceClass *dc = DEVICE_CLASS(klass); 80 81 device_class_set_props(dc, cpu_cluster_properties); 82 dc->realize = cpu_cluster_realize; 83 84 /* This is not directly for users, CPU children must be attached by code */ 85 dc->user_creatable = false; 86 } 87 88 static const TypeInfo cpu_cluster_type_info = { 89 .name = TYPE_CPU_CLUSTER, 90 .parent = TYPE_DEVICE, 91 .instance_size = sizeof(CPUClusterState), 92 .class_init = cpu_cluster_class_init, 93 }; 94 95 static void cpu_cluster_register_types(void) 96 { 97 type_register_static(&cpu_cluster_type_info); 98 } 99 100 type_init(cpu_cluster_register_types) 101