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 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 device_class_set_props(dc, 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) 100