hw/virtio-bus.c

   1 /*
   2  * VirtioBus
   3  *
   4  *  Copyright (C) 2012 : GreenSocs Ltd
   5  *      http://www.greensocs.com/ , email: info@greensocs.com
   6  *
   7  *  Developed by :
   8  *  Frederic Konrad   <fred.konrad@greensocs.com>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation, either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License along
  21  * with this program; if not, see <http://www.gnu.org/licenses/>.
  22  *
  23  */
  24
  25 #include "hw/hw.h"
  26 #include "qemu/error-report.h"
  27 #include "hw/qdev.h"
  28 #include "hw/virtio-bus.h"
  29 #include "hw/virtio.h"
  30
  31 /* #define DEBUG_VIRTIO_BUS */
  32
  33 #ifdef DEBUG_VIRTIO_BUS
  34 #define DPRINTF(fmt, ...) \
  35 do { printf("virtio_bus: " fmt , ## __VA_ARGS__); } while (0)
  36 #else
  37 #define DPRINTF(fmt, ...) do { } while (0)
  38 #endif
  39
  40 /* Plug the VirtIODevice */
  41 int virtio_bus_plug_device(VirtIODevice *vdev)
  42 {
  43     DeviceState *qdev = DEVICE(vdev);
  44     BusState *qbus = BUS(qdev_get_parent_bus(qdev));
  45     VirtioBusState *bus = VIRTIO_BUS(qbus);
  46     VirtioBusClass *klass = VIRTIO_BUS_GET_CLASS(bus);
  47     DPRINTF("%s: plug device.\n", qbus->name);
  48
  49     bus->vdev = vdev;
  50
  51     /*
  52      * The lines below will disappear when we drop VirtIOBindings, at the end
  53      * of the series.
  54      */
  55     bus->bindings.notify = klass->notify;
  56     bus->bindings.save_config = klass->save_config;
  57     bus->bindings.save_queue = klass->save_queue;
  58     bus->bindings.load_config = klass->load_config;
  59     bus->bindings.load_queue = klass->load_queue;
  60     bus->bindings.load_done = klass->load_done;
  61     bus->bindings.get_features = klass->get_features;
  62     bus->bindings.query_guest_notifiers = klass->query_guest_notifiers;
  63     bus->bindings.set_guest_notifiers = klass->set_guest_notifiers;
  64     bus->bindings.set_host_notifier = klass->set_host_notifier;
  65     bus->bindings.vmstate_change = klass->vmstate_change;
  66     virtio_bind_device(bus->vdev, &bus->bindings, qbus->parent);
  67
  68     if (klass->device_plugged != NULL) {
  69         klass->device_plugged(qbus->parent);
  70     }
  71
  72     return 0;
  73 }
  74
  75 /* Reset the virtio_bus */
  76 void virtio_bus_reset(VirtioBusState *bus)
  77 {
  78     DPRINTF("%s: reset device.\n", qbus->name);
  79     if (bus->vdev != NULL) {
  80         virtio_reset(bus->vdev);
  81     }
  82 }
  83
  84 /* Destroy the VirtIODevice */
  85 void virtio_bus_destroy_device(VirtioBusState *bus)
  86 {
  87     DeviceState *qdev;
  88     BusState *qbus = BUS(bus);
  89     VirtioBusClass *klass = VIRTIO_BUS_GET_CLASS(bus);
  90     DPRINTF("%s: remove device.\n", qbus->name);
  91
  92     if (bus->vdev != NULL) {
  93         if (klass->device_unplug != NULL) {
  94             klass->device_unplug(qbus->parent);
  95         }
  96         qdev = DEVICE(bus->vdev);
  97         qdev_free(qdev);
  98         bus->vdev = NULL;
  99     }
 100 }
 101
 102 /* Get the device id of the plugged device. */
 103 uint16_t virtio_bus_get_vdev_id(VirtioBusState *bus)
 104 {
 105     assert(bus->vdev != NULL);
 106     return bus->vdev->device_id;
 107 }
 108
 109 /* Get the config_len field of the plugged device. */
 110 size_t virtio_bus_get_vdev_config_len(VirtioBusState *bus)
 111 {
 112     assert(bus->vdev != NULL);
 113     return bus->vdev->config_len;
 114 }
 115
 116 /* Get the features of the plugged device. */
 117 uint32_t virtio_bus_get_vdev_features(VirtioBusState *bus,
 118                                     uint32_t requested_features)
 119 {
 120     VirtioDeviceClass *k;
 121     assert(bus->vdev != NULL);
 122     k = VIRTIO_DEVICE_GET_CLASS(bus->vdev);
 123     assert(k->get_features != NULL);
 124     return k->get_features(bus->vdev, requested_features);
 125 }
 126
 127 /* Get bad features of the plugged device. */
 128 uint32_t virtio_bus_get_vdev_bad_features(VirtioBusState *bus)
 129 {
 130     VirtioDeviceClass *k;
 131     assert(bus->vdev != NULL);
 132     k = VIRTIO_DEVICE_GET_CLASS(bus->vdev);
 133     if (k->bad_features != NULL) {
 134         return k->bad_features(bus->vdev);
 135     } else {
 136         return 0;
 137     }
 138 }
 139
 140 /* Get config of the plugged device. */
 141 void virtio_bus_get_vdev_config(VirtioBusState *bus, uint8_t *config)
 142 {
 143     VirtioDeviceClass *k;
 144     assert(bus->vdev != NULL);
 145     k = VIRTIO_DEVICE_GET_CLASS(bus->vdev);
 146     if (k->get_config != NULL) {
 147         k->get_config(bus->vdev, config);
 148     }
 149 }
 150
 151 static const TypeInfo virtio_bus_info = {
 152     .name = TYPE_VIRTIO_BUS,
 153     .parent = TYPE_BUS,
 154     .instance_size = sizeof(VirtioBusState),
 155     .abstract = true,
 156     .class_size = sizeof(VirtioBusClass),
 157 };
 158
 159 static void virtio_register_types(void)
 160 {
 161     type_register_static(&virtio_bus_info);
 162 }
 163
 164 type_init(virtio_register_types)