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 /* A VirtIODevice is being plugged */
  41 void virtio_bus_device_plugged(VirtIODevice *vdev, Error **errp)
  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     VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev);
  48
  49     DPRINTF("%s: plug device.\n", qbus->name);
  50
  51     if (klass->device_plugged != NULL) {
  52         klass->device_plugged(qbus->parent, errp);
  53     }
  54
  55     /* Get the features of the plugged device. */
  56     assert(vdc->get_features != NULL);
  57     vdev->host_features = vdc->get_features(vdev, vdev->host_features,
  58                                             errp);
  59 }
  60
  61 /* Reset the virtio_bus */
  62 void virtio_bus_reset(VirtioBusState *bus)
  63 {
  64     VirtIODevice *vdev = virtio_bus_get_device(bus);
  65
  66     DPRINTF("%s: reset device.\n", BUS(bus)->name);
  67     if (vdev != NULL) {
  68         virtio_reset(vdev);
  69     }
  70 }
  71
  72 /* A VirtIODevice is being unplugged */
  73 void virtio_bus_device_unplugged(VirtIODevice *vdev)
  74 {
  75     DeviceState *qdev = DEVICE(vdev);
  76     BusState *qbus = BUS(qdev_get_parent_bus(qdev));
  77     VirtioBusClass *klass = VIRTIO_BUS_GET_CLASS(qbus);
  78
  79     DPRINTF("%s: remove device.\n", qbus->name);
  80
  81     if (vdev != NULL) {
  82         if (klass->device_unplugged != NULL) {
  83             klass->device_unplugged(qbus->parent);
  84         }
  85     }
  86 }
  87
  88 /* Get the device id of the plugged device. */
  89 uint16_t virtio_bus_get_vdev_id(VirtioBusState *bus)
  90 {
  91     VirtIODevice *vdev = virtio_bus_get_device(bus);
  92     assert(vdev != NULL);
  93     return vdev->device_id;
  94 }
  95
  96 /* Get the config_len field of the plugged device. */
  97 size_t virtio_bus_get_vdev_config_len(VirtioBusState *bus)
  98 {
  99     VirtIODevice *vdev = virtio_bus_get_device(bus);
 100     assert(vdev != NULL);
 101     return vdev->config_len;
 102 }
 103
 104 /* Get bad features of the plugged device. */
 105 uint32_t virtio_bus_get_vdev_bad_features(VirtioBusState *bus)
 106 {
 107     VirtIODevice *vdev = virtio_bus_get_device(bus);
 108     VirtioDeviceClass *k;
 109
 110     assert(vdev != NULL);
 111     k = VIRTIO_DEVICE_GET_CLASS(vdev);
 112     if (k->bad_features != NULL) {
 113         return k->bad_features(vdev);
 114     } else {
 115         return 0;
 116     }
 117 }
 118
 119 /* Get config of the plugged device. */
 120 void virtio_bus_get_vdev_config(VirtioBusState *bus, uint8_t *config)
 121 {
 122     VirtIODevice *vdev = virtio_bus_get_device(bus);
 123     VirtioDeviceClass *k;
 124
 125     assert(vdev != NULL);
 126     k = VIRTIO_DEVICE_GET_CLASS(vdev);
 127     if (k->get_config != NULL) {
 128         k->get_config(vdev, config);
 129     }
 130 }
 131
 132 /* Set config of the plugged device. */
 133 void virtio_bus_set_vdev_config(VirtioBusState *bus, uint8_t *config)
 134 {
 135     VirtIODevice *vdev = virtio_bus_get_device(bus);
 136     VirtioDeviceClass *k;
 137
 138     assert(vdev != NULL);
 139     k = VIRTIO_DEVICE_GET_CLASS(vdev);
 140     if (k->set_config != NULL) {
 141         k->set_config(vdev, config);
 142     }
 143 }
 144
 145 static char *virtio_bus_get_dev_path(DeviceState *dev)
 146 {
 147     BusState *bus = qdev_get_parent_bus(dev);
 148     DeviceState *proxy = DEVICE(bus->parent);
 149     return qdev_get_dev_path(proxy);
 150 }
 151
 152 static char *virtio_bus_get_fw_dev_path(DeviceState *dev)
 153 {
 154     return NULL;
 155 }
 156
 157 static void virtio_bus_class_init(ObjectClass *klass, void *data)
 158 {
 159     BusClass *bus_class = BUS_CLASS(klass);
 160     bus_class->get_dev_path = virtio_bus_get_dev_path;
 161     bus_class->get_fw_dev_path = virtio_bus_get_fw_dev_path;
 162 }
 163
 164 static const TypeInfo virtio_bus_info = {
 165     .name = TYPE_VIRTIO_BUS,
 166     .parent = TYPE_BUS,
 167     .instance_size = sizeof(VirtioBusState),
 168     .abstract = true,
 169     .class_size = sizeof(VirtioBusClass),
 170     .class_init = virtio_bus_class_init
 171 };
 172
 173 static void virtio_register_types(void)
 174 {
 175     type_register_static(&virtio_bus_info);
 176 }
 177
 178 type_init(virtio_register_types)