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 "qemu/osdep.h" 26 #include "hw/hw.h" 27 #include "qemu/error-report.h" 28 #include "hw/qdev.h" 29 #include "hw/virtio/virtio-bus.h" 30 #include "hw/virtio/virtio.h" 31 32 /* #define DEBUG_VIRTIO_BUS */ 33 34 #ifdef DEBUG_VIRTIO_BUS 35 #define DPRINTF(fmt, ...) \ 36 do { printf("virtio_bus: " fmt , ## __VA_ARGS__); } while (0) 37 #else 38 #define DPRINTF(fmt, ...) do { } while (0) 39 #endif 40 41 /* A VirtIODevice is being plugged */ 42 void virtio_bus_device_plugged(VirtIODevice *vdev, Error **errp) 43 { 44 DeviceState *qdev = DEVICE(vdev); 45 BusState *qbus = BUS(qdev_get_parent_bus(qdev)); 46 VirtioBusState *bus = VIRTIO_BUS(qbus); 47 VirtioBusClass *klass = VIRTIO_BUS_GET_CLASS(bus); 48 VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev); 49 50 DPRINTF("%s: plug device.\n", qbus->name); 51 52 if (klass->device_plugged != NULL) { 53 klass->device_plugged(qbus->parent, errp); 54 } 55 56 /* Get the features of the plugged device. */ 57 assert(vdc->get_features != NULL); 58 vdev->host_features = vdc->get_features(vdev, vdev->host_features, 59 errp); 60 if (klass->post_plugged != NULL) { 61 klass->post_plugged(qbus->parent, errp); 62 } 63 } 64 65 /* Reset the virtio_bus */ 66 void virtio_bus_reset(VirtioBusState *bus) 67 { 68 VirtIODevice *vdev = virtio_bus_get_device(bus); 69 70 DPRINTF("%s: reset device.\n", BUS(bus)->name); 71 if (vdev != NULL) { 72 virtio_reset(vdev); 73 } 74 } 75 76 /* A VirtIODevice is being unplugged */ 77 void virtio_bus_device_unplugged(VirtIODevice *vdev) 78 { 79 DeviceState *qdev = DEVICE(vdev); 80 BusState *qbus = BUS(qdev_get_parent_bus(qdev)); 81 VirtioBusClass *klass = VIRTIO_BUS_GET_CLASS(qbus); 82 83 DPRINTF("%s: remove device.\n", qbus->name); 84 85 if (vdev != NULL) { 86 if (klass->device_unplugged != NULL) { 87 klass->device_unplugged(qbus->parent); 88 } 89 } 90 } 91 92 /* Get the device id of the plugged device. */ 93 uint16_t virtio_bus_get_vdev_id(VirtioBusState *bus) 94 { 95 VirtIODevice *vdev = virtio_bus_get_device(bus); 96 assert(vdev != NULL); 97 return vdev->device_id; 98 } 99 100 /* Get the config_len field of the plugged device. */ 101 size_t virtio_bus_get_vdev_config_len(VirtioBusState *bus) 102 { 103 VirtIODevice *vdev = virtio_bus_get_device(bus); 104 assert(vdev != NULL); 105 return vdev->config_len; 106 } 107 108 /* Get bad features of the plugged device. */ 109 uint32_t virtio_bus_get_vdev_bad_features(VirtioBusState *bus) 110 { 111 VirtIODevice *vdev = virtio_bus_get_device(bus); 112 VirtioDeviceClass *k; 113 114 assert(vdev != NULL); 115 k = VIRTIO_DEVICE_GET_CLASS(vdev); 116 if (k->bad_features != NULL) { 117 return k->bad_features(vdev); 118 } else { 119 return 0; 120 } 121 } 122 123 /* Get config of the plugged device. */ 124 void virtio_bus_get_vdev_config(VirtioBusState *bus, uint8_t *config) 125 { 126 VirtIODevice *vdev = virtio_bus_get_device(bus); 127 VirtioDeviceClass *k; 128 129 assert(vdev != NULL); 130 k = VIRTIO_DEVICE_GET_CLASS(vdev); 131 if (k->get_config != NULL) { 132 k->get_config(vdev, config); 133 } 134 } 135 136 /* Set config of the plugged device. */ 137 void virtio_bus_set_vdev_config(VirtioBusState *bus, uint8_t *config) 138 { 139 VirtIODevice *vdev = virtio_bus_get_device(bus); 140 VirtioDeviceClass *k; 141 142 assert(vdev != NULL); 143 k = VIRTIO_DEVICE_GET_CLASS(vdev); 144 if (k->set_config != NULL) { 145 k->set_config(vdev, config); 146 } 147 } 148 149 static char *virtio_bus_get_dev_path(DeviceState *dev) 150 { 151 BusState *bus = qdev_get_parent_bus(dev); 152 DeviceState *proxy = DEVICE(bus->parent); 153 return qdev_get_dev_path(proxy); 154 } 155 156 static char *virtio_bus_get_fw_dev_path(DeviceState *dev) 157 { 158 return NULL; 159 } 160 161 static void virtio_bus_class_init(ObjectClass *klass, void *data) 162 { 163 BusClass *bus_class = BUS_CLASS(klass); 164 bus_class->get_dev_path = virtio_bus_get_dev_path; 165 bus_class->get_fw_dev_path = virtio_bus_get_fw_dev_path; 166 } 167 168 static const TypeInfo virtio_bus_info = { 169 .name = TYPE_VIRTIO_BUS, 170 .parent = TYPE_BUS, 171 .instance_size = sizeof(VirtioBusState), 172 .abstract = true, 173 .class_size = sizeof(VirtioBusClass), 174 .class_init = virtio_bus_class_init 175 }; 176 177 static void virtio_register_types(void) 178 { 179 type_register_static(&virtio_bus_info); 180 } 181 182 type_init(virtio_register_types) 183