| 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/core/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, const 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) |