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     DeviceState *qdev;
  71     BusState *qbus = BUS(bus);
  72     VirtioBusClass *klass = VIRTIO_BUS_GET_CLASS(bus);
  73     DPRINTF("%s: remove device.\n", qbus->name);
  74
  75     if (bus->vdev != NULL) {
  76         if (klass->device_unplug != NULL) {
  77             klass->device_unplug(qbus->parent);
  78         }
  79         qdev = DEVICE(bus->vdev);
  80         qdev_free(qdev);
  81         bus->vdev = NULL;
  82     }
  83 }
  84
  85 /* Get the device id of the plugged device. */
  86 uint16_t virtio_bus_get_vdev_id(VirtioBusState *bus)
  87 {
  88     assert(bus->vdev != NULL);
  89     return bus->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     assert(bus->vdev != NULL);
  96     return bus->vdev->config_len;
  97 }
  98
  99 /* Get the features of the plugged device. */
 100 uint32_t virtio_bus_get_vdev_features(VirtioBusState *bus,
 101                                     uint32_t requested_features)
 102 {
 103     VirtioDeviceClass *k;
 104     assert(bus->vdev != NULL);
 105     k = VIRTIO_DEVICE_GET_CLASS(bus->vdev);
 106     assert(k->get_features != NULL);
 107     return k->get_features(bus->vdev, requested_features);
 108 }
 109
 110 /* Set the features of the plugged device. */
 111 void virtio_bus_set_vdev_features(VirtioBusState *bus,
 112                                       uint32_t requested_features)
 113 {
 114     VirtioDeviceClass *k;
 115     assert(bus->vdev != NULL);
 116     k = VIRTIO_DEVICE_GET_CLASS(bus->vdev);
 117     if (k->set_features != NULL) {
 118         k->set_features(bus->vdev, requested_features);
 119     }
 120 }
 121
 122 /* Get bad features of the plugged device. */
 123 uint32_t virtio_bus_get_vdev_bad_features(VirtioBusState *bus)
 124 {
 125     VirtioDeviceClass *k;
 126     assert(bus->vdev != NULL);
 127     k = VIRTIO_DEVICE_GET_CLASS(bus->vdev);
 128     if (k->bad_features != NULL) {
 129         return k->bad_features(bus->vdev);
 130     } else {
 131         return 0;
 132     }
 133 }
 134
 135 /* Get config of the plugged device. */
 136 void virtio_bus_get_vdev_config(VirtioBusState *bus, uint8_t *config)
 137 {
 138     VirtioDeviceClass *k;
 139     assert(bus->vdev != NULL);
 140     k = VIRTIO_DEVICE_GET_CLASS(bus->vdev);
 141     if (k->get_config != NULL) {
 142         k->get_config(bus->vdev, config);
 143     }
 144 }
 145
 146 /* Set config of the plugged device. */
 147 void virtio_bus_set_vdev_config(VirtioBusState *bus, uint8_t *config)
 148 {
 149     VirtioDeviceClass *k;
 150     assert(bus->vdev != NULL);
 151     k = VIRTIO_DEVICE_GET_CLASS(bus->vdev);
 152     if (k->set_config != NULL) {
 153         k->set_config(bus->vdev, config);
 154     }
 155 }
 156
 157 static const TypeInfo virtio_bus_info = {
 158     .name = TYPE_VIRTIO_BUS,
 159     .parent = TYPE_BUS,
 160     .instance_size = sizeof(VirtioBusState),
 161     .abstract = true,
 162     .class_size = sizeof(VirtioBusClass),
 163 };
 164
 165 static void virtio_register_types(void)
 166 {
 167     type_register_static(&virtio_bus_info);
 168 }
 169
 170 type_init(virtio_register_types)