hw/arm/bcm2836: Only provide "enabled-cpus" property to multicore SoCs
[qemu.git] / 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 "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)