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 | dc->props = 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) |
101 | |