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 int virtio_bus_device_plugged(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", BUS(bus)->name);
  62     if (vdev != NULL) {
  63         virtio_reset(vdev);
  64     }
  65 }
  66
  67 /* A VirtIODevice is being unplugged */
  68 void virtio_bus_device_unplugged(VirtIODevice *vdev)
  69 {
  70     DeviceState *qdev = DEVICE(vdev);
  71     BusState *qbus = BUS(qdev_get_parent_bus(qdev));
  72     VirtioBusClass *klass = VIRTIO_BUS_GET_CLASS(qbus);
  73
  74     DPRINTF("%s: remove device.\n", qbus->name);
  75
  76     if (vdev != NULL) {
  77         if (klass->device_unplugged != NULL) {
  78             klass->device_unplugged(qbus->parent);
  79         }
  80     }
  81 }
  82
  83 /* Get the device id of the plugged device. */
  84 uint16_t virtio_bus_get_vdev_id(VirtioBusState *bus)
  85 {
  86     VirtIODevice *vdev = virtio_bus_get_device(bus);
  87     assert(vdev != NULL);
  88     return vdev->device_id;
  89 }
  90
  91 /* Get the config_len field of the plugged device. */
  92 size_t virtio_bus_get_vdev_config_len(VirtioBusState *bus)
  93 {
  94     VirtIODevice *vdev = virtio_bus_get_device(bus);
  95     assert(vdev != NULL);
  96     return 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     VirtIODevice *vdev = virtio_bus_get_device(bus);
 104     VirtioDeviceClass *k;
 105
 106     assert(vdev != NULL);
 107     k = VIRTIO_DEVICE_GET_CLASS(vdev);
 108     assert(k->get_features != NULL);
 109     return k->get_features(vdev, requested_features);
 110 }
 111
 112 /* Get bad features of the plugged device. */
 113 uint32_t virtio_bus_get_vdev_bad_features(VirtioBusState *bus)
 114 {
 115     VirtIODevice *vdev = virtio_bus_get_device(bus);
 116     VirtioDeviceClass *k;
 117
 118     assert(vdev != NULL);
 119     k = VIRTIO_DEVICE_GET_CLASS(vdev);
 120     if (k->bad_features != NULL) {
 121         return k->bad_features(vdev);
 122     } else {
 123         return 0;
 124     }
 125 }
 126
 127 /* Get config of the plugged device. */
 128 void virtio_bus_get_vdev_config(VirtioBusState *bus, uint8_t *config)
 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->get_config != NULL) {
 136         k->get_config(vdev, config);
 137     }
 138 }
 139
 140 /* Set config of the plugged device. */
 141 void virtio_bus_set_vdev_config(VirtioBusState *bus, uint8_t *config)
 142 {
 143     VirtIODevice *vdev = virtio_bus_get_device(bus);
 144     VirtioDeviceClass *k;
 145
 146     assert(vdev != NULL);
 147     k = VIRTIO_DEVICE_GET_CLASS(vdev);
 148     if (k->set_config != NULL) {
 149         k->set_config(vdev, config);
 150     }
 151 }
 152
 153 static char *virtio_bus_get_dev_path(DeviceState *dev)
 154 {
 155     BusState *bus = qdev_get_parent_bus(dev);
 156     DeviceState *proxy = DEVICE(bus->parent);
 157     return qdev_get_dev_path(proxy);
 158 }
 159
 160 static char *virtio_bus_get_fw_dev_path(DeviceState *dev)
 161 {
 162     return NULL;
 163 }
 164
 165 static void virtio_bus_class_init(ObjectClass *klass, void *data)
 166 {
 167     BusClass *bus_class = BUS_CLASS(klass);
 168     bus_class->get_dev_path = virtio_bus_get_dev_path;
 169     bus_class->get_fw_dev_path = virtio_bus_get_fw_dev_path;
 170 }
 171
 172 static const TypeInfo virtio_bus_info = {
 173     .name = TYPE_VIRTIO_BUS,
 174     .parent = TYPE_BUS,
 175     .instance_size = sizeof(VirtioBusState),
 176     .abstract = true,
 177     .class_size = sizeof(VirtioBusClass),
 178     .class_init = virtio_bus_class_init
 179 };
 180
 181 static void virtio_register_types(void)
 182 {
 183     type_register_static(&virtio_bus_info);
 184 }
 185
 186 type_init(virtio_register_types)