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) 182