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) 179