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