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 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
add_cpu_to_cluster(Object * obj,void * opaque)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
cpu_cluster_realize(DeviceState * dev,Error ** errp)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
cpu_cluster_class_init(ObjectClass * klass,const void * data)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
cpu_cluster_register_types(void)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)
99