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 #ifndef VIRTIO_BUS_H 26 #define VIRTIO_BUS_H 27 28 #include "hw/qdev.h" 29 #include "sysemu/sysemu.h" 30 #include "hw/virtio/virtio.h" 31 32 #define TYPE_VIRTIO_BUS "virtio-bus" 33 #define VIRTIO_BUS_GET_CLASS(obj) \ 34 OBJECT_GET_CLASS(VirtioBusClass, obj, TYPE_VIRTIO_BUS) 35 #define VIRTIO_BUS_CLASS(klass) \ 36 OBJECT_CLASS_CHECK(VirtioBusClass, klass, TYPE_VIRTIO_BUS) 37 #define VIRTIO_BUS(obj) OBJECT_CHECK(VirtioBusState, (obj), TYPE_VIRTIO_BUS) 38 39 typedef struct VirtioBusState VirtioBusState; 40 41 typedef struct VirtioBusClass { 42 /* This is what a VirtioBus must implement */ 43 BusClass parent; 44 void (*notify)(DeviceState *d, uint16_t vector); 45 void (*save_config)(DeviceState *d, QEMUFile *f); 46 void (*save_queue)(DeviceState *d, int n, QEMUFile *f); 47 int (*load_config)(DeviceState *d, QEMUFile *f); 48 int (*load_queue)(DeviceState *d, int n, QEMUFile *f); 49 int (*load_done)(DeviceState *d, QEMUFile *f); 50 unsigned (*get_features)(DeviceState *d); 51 bool (*query_guest_notifiers)(DeviceState *d); 52 int (*set_guest_notifiers)(DeviceState *d, int nvqs, bool assign); 53 int (*set_host_notifier)(DeviceState *d, int n, bool assigned); 54 void (*vmstate_change)(DeviceState *d, bool running); 55 /* 56 * transport independent init function. 57 * This is called by virtio-bus just after the device is plugged. 58 */ 59 void (*device_plugged)(DeviceState *d); 60 /* 61 * transport independent exit function. 62 * This is called by virtio-bus just before the device is unplugged. 63 */ 64 void (*device_unplugged)(DeviceState *d); 65 /* 66 * Does the transport have variable vring alignment? 67 * (ie can it ever call virtio_queue_set_align()?) 68 * Note that changing this will break migration for this transport. 69 */ 70 bool has_variable_vring_alignment; 71 } VirtioBusClass; 72 73 struct VirtioBusState { 74 BusState parent_obj; 75 }; 76 77 int virtio_bus_device_plugged(VirtIODevice *vdev); 78 void virtio_bus_reset(VirtioBusState *bus); 79 void virtio_bus_device_unplugged(VirtIODevice *bus); 80 /* Get the device id of the plugged device. */ 81 uint16_t virtio_bus_get_vdev_id(VirtioBusState *bus); 82 /* Get the config_len field of the plugged device. */ 83 size_t virtio_bus_get_vdev_config_len(VirtioBusState *bus); 84 /* Get the features of the plugged device. */ 85 uint32_t virtio_bus_get_vdev_features(VirtioBusState *bus, 86 uint32_t requested_features); 87 /* Set the features of the plugged device. */ 88 void virtio_bus_set_vdev_features(VirtioBusState *bus, 89 uint32_t requested_features); 90 /* Get bad features of the plugged device. */ 91 uint32_t virtio_bus_get_vdev_bad_features(VirtioBusState *bus); 92 /* Get config of the plugged device. */ 93 void virtio_bus_get_vdev_config(VirtioBusState *bus, uint8_t *config); 94 /* Set config of the plugged device. */ 95 void virtio_bus_set_vdev_config(VirtioBusState *bus, uint8_t *config); 96 97 static inline VirtIODevice *virtio_bus_get_device(VirtioBusState *bus) 98 { 99 BusState *qbus = &bus->parent_obj; 100 BusChild *kid = QTAILQ_FIRST(&qbus->children); 101 DeviceState *qdev = kid ? kid->child : NULL; 102 103 /* This is used on the data path, the cast is guaranteed 104 * to succeed by the qdev machinery. 105 */ 106 return (VirtIODevice *)qdev; 107 } 108 109 #endif /* VIRTIO_BUS_H */ 110