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
add_cpu_to_cluster(Object * obj,void * opaque)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
cpu_cluster_realize(DeviceState * dev,Error ** errp)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
cpu_cluster_class_init(ObjectClass * klass,void * data)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
cpu_cluster_register_types(void)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