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 void (*save_extra_state)(DeviceState *d, QEMUFile *f); 48 int (*load_config)(DeviceState *d, QEMUFile *f); 49 int (*load_queue)(DeviceState *d, int n, QEMUFile *f); 50 int (*load_done)(DeviceState *d, QEMUFile *f); 51 int (*load_extra_state)(DeviceState *d, QEMUFile *f); 52 bool (*has_extra_state)(DeviceState *d); 53 bool (*query_guest_notifiers)(DeviceState *d); 54 int (*set_guest_notifiers)(DeviceState *d, int nvqs, bool assign); 55 int (*set_host_notifier)(DeviceState *d, int n, bool assigned); 56 void (*vmstate_change)(DeviceState *d, bool running); 57 /* 58 * transport independent init function. 59 * This is called by virtio-bus just after the device is plugged. 60 */ 61 void (*device_plugged)(DeviceState *d, Error **errp); 62 /* 63 * Re-evaluate setup after feature bits have been validated 64 * by the device backend. 65 */ 66 void (*post_plugged)(DeviceState *d, Error **errp); 67 /* 68 * transport independent exit function. 69 * This is called by virtio-bus just before the device is unplugged. 70 */ 71 void (*device_unplugged)(DeviceState *d); 72 int (*query_nvectors)(DeviceState *d); 73 /* 74 * Does the transport have variable vring alignment? 75 * (ie can it ever call virtio_queue_set_align()?) 76 * Note that changing this will break migration for this transport. 77 */ 78 bool has_variable_vring_alignment; 79 } VirtioBusClass; 80 81 struct VirtioBusState { 82 BusState parent_obj; 83 }; 84 85 void virtio_bus_device_plugged(VirtIODevice *vdev, Error **errp); 86 void virtio_bus_reset(VirtioBusState *bus); 87 void virtio_bus_device_unplugged(VirtIODevice *bus); 88 /* Get the device id of the plugged device. */ 89 uint16_t virtio_bus_get_vdev_id(VirtioBusState *bus); 90 /* Get the config_len field of the plugged device. */ 91 size_t virtio_bus_get_vdev_config_len(VirtioBusState *bus); 92 /* Get the features of the plugged device. */ 93 uint32_t virtio_bus_get_vdev_features(VirtioBusState *bus, 94 uint32_t requested_features); 95 /* Get bad features of the plugged device. */ 96 uint32_t virtio_bus_get_vdev_bad_features(VirtioBusState *bus); 97 /* Get config of the plugged device. */ 98 void virtio_bus_get_vdev_config(VirtioBusState *bus, uint8_t *config); 99 /* Set config of the plugged device. */ 100 void virtio_bus_set_vdev_config(VirtioBusState *bus, uint8_t *config); 101 102 static inline VirtIODevice *virtio_bus_get_device(VirtioBusState *bus) 103 { 104 BusState *qbus = &bus->parent_obj; 105 BusChild *kid = QTAILQ_FIRST(&qbus->children); 106 DeviceState *qdev = kid ? kid->child : NULL; 107 108 /* This is used on the data path, the cast is guaranteed 109 * to succeed by the qdev machinery. 110 */ 111 return (VirtIODevice *)qdev; 112 } 113 114 #endif /* VIRTIO_BUS_H */ 115