xref: /openbmc/qemu/hw/cpu/core.c (revision b86c6ba6)
1 /*
2  * CPU core abstract device
3  *
4  * Copyright (C) 2016 Bharata B Rao <bharata@linux.vnet.ibm.com>
5  *
6  * This work is licensed under the terms of the GNU GPL, version 2 or later.
7  * See the COPYING file in the top-level directory.
8  */
9 
10 #include "qemu/osdep.h"
11 
12 #include "hw/boards.h"
13 #include "hw/cpu/core.h"
14 #include "qapi/error.h"
15 #include "qapi/visitor.h"
16 
17 static void core_prop_get_core_id(Object *obj, Visitor *v, const char *name,
18                                   void *opaque, Error **errp)
19 {
20     CPUCore *core = CPU_CORE(obj);
21     int64_t value = core->core_id;
22 
23     visit_type_int(v, name, &value, errp);
24 }
25 
26 static void core_prop_set_core_id(Object *obj, Visitor *v, const char *name,
27                                   void *opaque, Error **errp)
28 {
29     CPUCore *core = CPU_CORE(obj);
30     int64_t value;
31 
32     if (!visit_type_int(v, name, &value, errp)) {
33         return;
34     }
35 
36     if (value < 0) {
37         error_setg(errp, "Invalid core id %"PRId64, value);
38         return;
39     }
40 
41     core->core_id = value;
42 }
43 
44 static void core_prop_get_nr_threads(Object *obj, Visitor *v, const char *name,
45                                      void *opaque, Error **errp)
46 {
47     CPUCore *core = CPU_CORE(obj);
48     int64_t value = core->nr_threads;
49 
50     visit_type_int(v, name, &value, errp);
51 }
52 
53 static void core_prop_set_nr_threads(Object *obj, Visitor *v, const char *name,
54                                      void *opaque, Error **errp)
55 {
56     CPUCore *core = CPU_CORE(obj);
57     int64_t value;
58 
59     if (!visit_type_int(v, name, &value, errp)) {
60         return;
61     }
62 
63     core->nr_threads = value;
64 }
65 
66 static void cpu_core_instance_init(Object *obj)
67 {
68     CPUCore *core = CPU_CORE(obj);
69 
70     /*
71      * Only '-device something-cpu-core,help' can get us there before
72      * the machine has been created. We don't care to set nr_threads
73      * in this case since it isn't used afterwards.
74      */
75     if (current_machine) {
76         core->nr_threads = current_machine->smp.threads;
77     }
78 }
79 
80 static void cpu_core_class_init(ObjectClass *oc, void *data)
81 {
82     DeviceClass *dc = DEVICE_CLASS(oc);
83 
84     set_bit(DEVICE_CATEGORY_CPU, dc->categories);
85     object_class_property_add(oc, "core-id", "int", core_prop_get_core_id,
86                               core_prop_set_core_id, NULL, NULL);
87     object_class_property_add(oc, "nr-threads", "int", core_prop_get_nr_threads,
88                               core_prop_set_nr_threads, NULL, NULL);
89 }
90 
91 static const TypeInfo cpu_core_type_info = {
92     .name = TYPE_CPU_CORE,
93     .parent = TYPE_DEVICE,
94     .abstract = true,
95     .class_init = cpu_core_class_init,
96     .instance_size = sizeof(CPUCore),
97     .instance_init = cpu_core_instance_init,
98 };
99 
100 static void cpu_core_register_types(void)
101 {
102     type_register_static(&cpu_core_type_info);
103 }
104 
105 type_init(cpu_core_register_types)
106