aboutsummaryrefslogtreecommitdiff
path: root/hw/virtio-bus.c
blob: 6045d8ad86a4cb0e9b11bbfc96eeb6b42efda5d0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
/*
 * VirtioBus
 *
 *  Copyright (C) 2012 : GreenSocs Ltd
 *      http://www.greensocs.com/ , email: info@greensocs.com
 *
 *  Developed by :
 *  Frederic Konrad   <fred.konrad@greensocs.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, see <http://www.gnu.org/licenses/>.
 *
 */

#include "hw.h"
#include "qemu/error-report.h"
#include "qdev.h"
#include "virtio-bus.h"
#include "virtio.h"

/* #define DEBUG_VIRTIO_BUS */

#ifdef DEBUG_VIRTIO_BUS
#define DPRINTF(fmt, ...) \
do { printf("virtio_bus: " fmt , ## __VA_ARGS__); } while (0)
#else
#define DPRINTF(fmt, ...) do { } while (0)
#endif

/* Plug the VirtIODevice */
int virtio_bus_plug_device(VirtIODevice *vdev)
{
    DeviceState *qdev = DEVICE(vdev);
    BusState *qbus = BUS(qdev_get_parent_bus(qdev));
    VirtioBusState *bus = VIRTIO_BUS(qbus);
    VirtioBusClass *klass = VIRTIO_BUS_GET_CLASS(bus);
    DPRINTF("%s: plug device.\n", qbus->name);

    bus->vdev = vdev;

    /*
     * The lines below will disappear when we drop VirtIOBindings, at the end
     * of the series.
     */
    bus->bindings.notify = klass->notify;
    bus->bindings.save_config = klass->save_config;
    bus->bindings.save_queue = klass->save_queue;
    bus->bindings.load_config = klass->load_config;
    bus->bindings.load_queue = klass->load_queue;
    bus->bindings.load_done = klass->load_done;
    bus->bindings.get_features = klass->get_features;
    bus->bindings.query_guest_notifiers = klass->query_guest_notifiers;
    bus->bindings.set_guest_notifiers = klass->set_guest_notifiers;
    bus->bindings.set_host_notifier = klass->set_host_notifier;
    bus->bindings.vmstate_change = klass->vmstate_change;
    virtio_bind_device(bus->vdev, &bus->bindings, qbus->parent);

    if (klass->device_plugged != NULL) {
        klass->device_plugged(qbus->parent);
    }

    return 0;
}

/* Reset the virtio_bus */
void virtio_bus_reset(VirtioBusState *bus)
{
    DPRINTF("%s: reset device.\n", qbus->name);
    if (bus->vdev != NULL) {
        virtio_reset(bus->vdev);
    }
}

/* Destroy the VirtIODevice */
void virtio_bus_destroy_device(VirtioBusState *bus)
{
    DeviceState *qdev;
    BusState *qbus = BUS(bus);
    VirtioBusClass *klass = VIRTIO_BUS_GET_CLASS(bus);
    DPRINTF("%s: remove device.\n", qbus->name);

    if (bus->vdev != NULL) {
        if (klass->device_unplug != NULL) {
            klass->device_unplug(qbus->parent);
        }
        qdev = DEVICE(bus->vdev);
        qdev_free(qdev);
        bus->vdev = NULL;
    }
}

/* Get the device id of the plugged device. */
uint16_t virtio_bus_get_vdev_id(VirtioBusState *bus)
{
    assert(bus->vdev != NULL);
    return bus->vdev->device_id;
}

/* Get the config_len field of the plugged device. */
size_t virtio_bus_get_vdev_config_len(VirtioBusState *bus)
{
    assert(bus->vdev != NULL);
    return bus->vdev->config_len;
}

/* Get the features of the plugged device. */
uint32_t virtio_bus_get_vdev_features(VirtioBusState *bus,
                                    uint32_t requested_features)
{
    VirtioDeviceClass *k;
    assert(bus->vdev != NULL);
    k = VIRTIO_DEVICE_GET_CLASS(bus->vdev);
    assert(k->get_features != NULL);
    return k->get_features(bus->vdev, requested_features);
}

/* Get bad features of the plugged device. */
uint32_t virtio_bus_get_vdev_bad_features(VirtioBusState *bus)
{
    VirtioDeviceClass *k;
    assert(bus->vdev != NULL);
    k = VIRTIO_DEVICE_GET_CLASS(bus->vdev);
    if (k->bad_features != NULL) {
        return k->bad_features(bus->vdev);
    } else {
        return 0;
    }
}

/* Get config of the plugged device. */
void virtio_bus_get_vdev_config(VirtioBusState *bus, uint8_t *config)
{
    VirtioDeviceClass *k;
    assert(bus->vdev != NULL);
    k = VIRTIO_DEVICE_GET_CLASS(bus->vdev);
    if (k->get_config != NULL) {
        k->get_config(bus->vdev, config);
    }
}

static const TypeInfo virtio_bus_info = {
    .name = TYPE_VIRTIO_BUS,
    .parent = TYPE_BUS,
    .instance_size = sizeof(VirtioBusState),
    .abstract = true,
    .class_size = sizeof(VirtioBusClass),
};

static void virtio_register_types(void)
{
    type_register_static(&virtio_bus_info);
}

type_init(virtio_register_types)