LXR qemu/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, ...) \
  35do { printf("virtio_bus: " fmt , ## __VA_ARGS__); } while (0)
  36#else
  37#define DPRINTF(fmt, ...) do { } while (0)
  38#endif
  39
  40/* Plug the VirtIODevice */
  41int 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 */
  59void 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 */
  68void 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. */
  86uint16_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. */
  93size_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. */
 100uint32_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. */
 111void 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. */
 123uint32_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. */
 136void 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. */
 147void 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
 157static char *virtio_bus_get_dev_path(DeviceState *dev)
 158{
 159    BusState *bus = qdev_get_parent_bus(dev);
 160    DeviceState *proxy = DEVICE(bus->parent);
 161    return qdev_get_dev_path(proxy);
 162}
 163
 164static char *virtio_bus_get_fw_dev_path(DeviceState *dev)
 165{
 166    return NULL;
 167}
 168
 169static void virtio_bus_class_init(ObjectClass *klass, void *data)
 170{
 171    BusClass *bus_class = BUS_CLASS(klass);
 172    bus_class->get_dev_path = virtio_bus_get_dev_path;
 173    bus_class->get_fw_dev_path = virtio_bus_get_fw_dev_path;
 174}
 175
 176static const TypeInfo virtio_bus_info = {
 177    .name = TYPE_VIRTIO_BUS,
 178    .parent = TYPE_BUS,
 179    .instance_size = sizeof(VirtioBusState),
 180    .abstract = true,
 181    .class_size = sizeof(VirtioBusClass),
 182    .class_init = virtio_bus_class_init
 183};
 184
 185static void virtio_register_types(void)
 186{
 187    type_register_static(&virtio_bus_info);
 188}
 189
 190type_init(virtio_register_types)
 191