hw/virtio/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/virtio-bus.h"
  29 #include "hw/virtio/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     if (klass->device_plugged != NULL) {
  50         klass->device_plugged(qbus->parent);
  51     }
  52
  53     return 0;
  54 }
  55
  56 /* Reset the virtio_bus */
  57 void virtio_bus_reset(VirtioBusState *bus)
  58 {
  59     VirtIODevice *vdev = virtio_bus_get_device(bus);
  60
  61     DPRINTF("%s: reset device.\n", qbus->name);
  62     if (vdev != NULL) {
  63         virtio_reset(vdev);
  64     }
  65 }
  66
  67 /* Destroy the VirtIODevice */
  68 void virtio_bus_destroy_device(VirtioBusState *bus)
  69 {
  70     BusState *qbus = BUS(bus);
  71     VirtioBusClass *klass = VIRTIO_BUS_GET_CLASS(bus);
  72     VirtIODevice *vdev = virtio_bus_get_device(bus);
  73
  74     DPRINTF("%s: remove device.\n", qbus->name);
  75
  76     if (vdev != NULL) {
  77         if (klass->device_unplug != NULL) {
  78             klass->device_unplug(qbus->parent);
  79         }
  80         object_unparent(OBJECT(vdev));
  81     }
  82 }
  83
  84 /* Get the device id of the plugged device. */
  85 uint16_t virtio_bus_get_vdev_id(VirtioBusState *bus)
  86 {
  87     VirtIODevice *vdev = virtio_bus_get_device(bus);
  88     assert(vdev != NULL);
  89     return vdev->device_id;
  90 }
  91
  92 /* Get the config_len field of the plugged device. */
  93 size_t virtio_bus_get_vdev_config_len(VirtioBusState *bus)
  94 {
  95     VirtIODevice *vdev = virtio_bus_get_device(bus);
  96     assert(vdev != NULL);
  97     return vdev->config_len;
  98 }
  99
 100 /* Get the features of the plugged device. */
 101 uint32_t virtio_bus_get_vdev_features(VirtioBusState *bus,
 102                                     uint32_t requested_features)
 103 {
 104     VirtIODevice *vdev = virtio_bus_get_device(bus);
 105     VirtioDeviceClass *k;
 106
 107     assert(vdev != NULL);
 108     k = VIRTIO_DEVICE_GET_CLASS(vdev);
 109     assert(k->get_features != NULL);
 110     return k->get_features(vdev, requested_features);
 111 }
 112
 113 /* Set the features of the plugged device. */
 114 void virtio_bus_set_vdev_features(VirtioBusState *bus,
 115                                       uint32_t requested_features)
 116 {
 117     VirtIODevice *vdev = virtio_bus_get_device(bus);
 118     VirtioDeviceClass *k;
 119
 120     assert(vdev != NULL);
 121     k = VIRTIO_DEVICE_GET_CLASS(vdev);
 122     if (k->set_features != NULL) {
 123         k->set_features(vdev, requested_features);
 124     }
 125 }
 126
 127 /* Get bad features of the plugged device. */
 128 uint32_t virtio_bus_get_vdev_bad_features(VirtioBusState *bus)
 129 {
 130     VirtIODevice *vdev = virtio_bus_get_device(bus);
 131     VirtioDeviceClass *k;
 132
 133     assert(vdev != NULL);
 134     k = VIRTIO_DEVICE_GET_CLASS(vdev);
 135     if (k->bad_features != NULL) {
 136         return k->bad_features(vdev);
 137     } else {
 138         return 0;
 139     }
 140 }
 141
 142 /* Get config of the plugged device. */
 143 void virtio_bus_get_vdev_config(VirtioBusState *bus, uint8_t *config)
 144 {
 145     VirtIODevice *vdev = virtio_bus_get_device(bus);
 146     VirtioDeviceClass *k;
 147
 148     assert(vdev != NULL);
 149     k = VIRTIO_DEVICE_GET_CLASS(vdev);
 150     if (k->get_config != NULL) {
 151         k->get_config(vdev, config);
 152     }
 153 }
 154
 155 /* Set config of the plugged device. */
 156 void virtio_bus_set_vdev_config(VirtioBusState *bus, uint8_t *config)
 157 {
 158     VirtIODevice *vdev = virtio_bus_get_device(bus);
 159     VirtioDeviceClass *k;
 160
 161     assert(vdev != NULL);
 162     k = VIRTIO_DEVICE_GET_CLASS(vdev);
 163     if (k->set_config != NULL) {
 164         k->set_config(vdev, config);
 165     }
 166 }
 167
 168 static char *virtio_bus_get_dev_path(DeviceState *dev)
 169 {
 170     BusState *bus = qdev_get_parent_bus(dev);
 171     DeviceState *proxy = DEVICE(bus->parent);
 172     return qdev_get_dev_path(proxy);
 173 }
 174
 175 static char *virtio_bus_get_fw_dev_path(DeviceState *dev)
 176 {
 177     return NULL;
 178 }
 179
 180 static void virtio_bus_class_init(ObjectClass *klass, void *data)
 181 {
 182     BusClass *bus_class = BUS_CLASS(klass);
 183     bus_class->get_dev_path = virtio_bus_get_dev_path;
 184     bus_class->get_fw_dev_path = virtio_bus_get_fw_dev_path;
 185 }
 186
 187 static const TypeInfo virtio_bus_info = {
 188     .name = TYPE_VIRTIO_BUS,
 189     .parent = TYPE_BUS,
 190     .instance_size = sizeof(VirtioBusState),
 191     .abstract = true,
 192     .class_size = sizeof(VirtioBusClass),
 193     .class_init = virtio_bus_class_init
 194 };
 195
 196 static void virtio_register_types(void)
 197 {
 198     type_register_static(&virtio_bus_info);
 199 }
 200
 201 type_init(virtio_register_types)