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     if (klass->post_plugged != NULL) {
  60         klass->post_plugged(qbus->parent, errp);
  61     }
  62 }
  63
  64 /* Reset the virtio_bus */
  65 void virtio_bus_reset(VirtioBusState *bus)
  66 {
  67     VirtIODevice *vdev = virtio_bus_get_device(bus);
  68
  69     DPRINTF("%s: reset device.\n", BUS(bus)->name);
  70     if (vdev != NULL) {
  71         virtio_reset(vdev);
  72     }
  73 }
  74
  75 /* A VirtIODevice is being unplugged */
  76 void virtio_bus_device_unplugged(VirtIODevice *vdev)
  77 {
  78     DeviceState *qdev = DEVICE(vdev);
  79     BusState *qbus = BUS(qdev_get_parent_bus(qdev));
  80     VirtioBusClass *klass = VIRTIO_BUS_GET_CLASS(qbus);
  81
  82     DPRINTF("%s: remove device.\n", qbus->name);
  83
  84     if (vdev != NULL) {
  85         if (klass->device_unplugged != NULL) {
  86             klass->device_unplugged(qbus->parent);
  87         }
  88     }
  89 }
  90
  91 /* Get the device id of the plugged device. */
  92 uint16_t virtio_bus_get_vdev_id(VirtioBusState *bus)
  93 {
  94     VirtIODevice *vdev = virtio_bus_get_device(bus);
  95     assert(vdev != NULL);
  96     return vdev->device_id;
  97 }
  98
  99 /* Get the config_len field of the plugged device. */
 100 size_t virtio_bus_get_vdev_config_len(VirtioBusState *bus)
 101 {
 102     VirtIODevice *vdev = virtio_bus_get_device(bus);
 103     assert(vdev != NULL);
 104     return vdev->config_len;
 105 }
 106
 107 /* Get bad features of the plugged device. */
 108 uint32_t virtio_bus_get_vdev_bad_features(VirtioBusState *bus)
 109 {
 110     VirtIODevice *vdev = virtio_bus_get_device(bus);
 111     VirtioDeviceClass *k;
 112
 113     assert(vdev != NULL);
 114     k = VIRTIO_DEVICE_GET_CLASS(vdev);
 115     if (k->bad_features != NULL) {
 116         return k->bad_features(vdev);
 117     } else {
 118         return 0;
 119     }
 120 }
 121
 122 /* Get config of the plugged device. */
 123 void virtio_bus_get_vdev_config(VirtioBusState *bus, uint8_t *config)
 124 {
 125     VirtIODevice *vdev = virtio_bus_get_device(bus);
 126     VirtioDeviceClass *k;
 127
 128     assert(vdev != NULL);
 129     k = VIRTIO_DEVICE_GET_CLASS(vdev);
 130     if (k->get_config != NULL) {
 131         k->get_config(vdev, config);
 132     }
 133 }
 134
 135 /* Set config of the plugged device. */
 136 void virtio_bus_set_vdev_config(VirtioBusState *bus, uint8_t *config)
 137 {
 138     VirtIODevice *vdev = virtio_bus_get_device(bus);
 139     VirtioDeviceClass *k;
 140
 141     assert(vdev != NULL);
 142     k = VIRTIO_DEVICE_GET_CLASS(vdev);
 143     if (k->set_config != NULL) {
 144         k->set_config(vdev, config);
 145     }
 146 }
 147
 148 static char *virtio_bus_get_dev_path(DeviceState *dev)
 149 {
 150     BusState *bus = qdev_get_parent_bus(dev);
 151     DeviceState *proxy = DEVICE(bus->parent);
 152     return qdev_get_dev_path(proxy);
 153 }
 154
 155 static char *virtio_bus_get_fw_dev_path(DeviceState *dev)
 156 {
 157     return NULL;
 158 }
 159
 160 static void virtio_bus_class_init(ObjectClass *klass, void *data)
 161 {
 162     BusClass *bus_class = BUS_CLASS(klass);
 163     bus_class->get_dev_path = virtio_bus_get_dev_path;
 164     bus_class->get_fw_dev_path = virtio_bus_get_fw_dev_path;
 165 }
 166
 167 static const TypeInfo virtio_bus_info = {
 168     .name = TYPE_VIRTIO_BUS,
 169     .parent = TYPE_BUS,
 170     .instance_size = sizeof(VirtioBusState),
 171     .abstract = true,
 172     .class_size = sizeof(VirtioBusClass),
 173     .class_init = virtio_bus_class_init
 174 };
 175
 176 static void virtio_register_types(void)
 177 {
 178     type_register_static(&virtio_bus_info);
 179 }
 180
 181 type_init(virtio_register_types)