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