hw/cpu/core.c

   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)