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