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335d52f4 LM |
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" | |
a27bd6c7 | 23 | #include "hw/qdev-properties.h" |
2e5b09fd | 24 | #include "hw/core/cpu.h" |
335d52f4 LM |
25 | #include "qapi/error.h" |
26 | #include "qemu/module.h" | |
7ea7b9ad | 27 | #include "qemu/cutils.h" |
335d52f4 LM |
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 | ||
7ea7b9ad PM |
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 | ||
335d52f4 LM |
77 | static void cpu_cluster_class_init(ObjectClass *klass, void *data) |
78 | { | |
79 | DeviceClass *dc = DEVICE_CLASS(klass); | |
80 | ||
81 | dc->props = cpu_cluster_properties; | |
7ea7b9ad | 82 | dc->realize = cpu_cluster_realize; |
dab864dc TH |
83 | |
84 | /* This is not directly for users, CPU children must be attached by code */ | |
85 | dc->user_creatable = false; | |
335d52f4 LM |
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) |