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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288
|
/*
* Vhost-user i2c virtio device
*
* Copyright (c) 2021 Viresh Kumar <viresh.kumar@linaro.org>
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "qemu/osdep.h"
#include "qapi/error.h"
#include "hw/qdev-properties.h"
#include "hw/virtio/virtio-bus.h"
#include "hw/virtio/vhost-user-i2c.h"
#include "qemu/error-report.h"
#include "standard-headers/linux/virtio_ids.h"
static const int feature_bits[] = {
VIRTIO_I2C_F_ZERO_LENGTH_REQUEST,
VIRTIO_F_RING_RESET,
VHOST_INVALID_FEATURE_BIT
};
static void vu_i2c_start(VirtIODevice *vdev)
{
BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
VHostUserI2C *i2c = VHOST_USER_I2C(vdev);
int ret, i;
if (!k->set_guest_notifiers) {
error_report("binding does not support guest notifiers");
return;
}
ret = vhost_dev_enable_notifiers(&i2c->vhost_dev, vdev);
if (ret < 0) {
error_report("Error enabling host notifiers: %d", -ret);
return;
}
ret = k->set_guest_notifiers(qbus->parent, i2c->vhost_dev.nvqs, true);
if (ret < 0) {
error_report("Error binding guest notifier: %d", -ret);
goto err_host_notifiers;
}
i2c->vhost_dev.acked_features = vdev->guest_features;
ret = vhost_dev_start(&i2c->vhost_dev, vdev, true);
if (ret < 0) {
error_report("Error starting vhost-user-i2c: %d", -ret);
goto err_guest_notifiers;
}
/*
* guest_notifier_mask/pending not used yet, so just unmask
* everything here. virtio-pci will do the right thing by
* enabling/disabling irqfd.
*/
for (i = 0; i < i2c->vhost_dev.nvqs; i++) {
vhost_virtqueue_mask(&i2c->vhost_dev, vdev, i, false);
}
return;
err_guest_notifiers:
k->set_guest_notifiers(qbus->parent, i2c->vhost_dev.nvqs, false);
err_host_notifiers:
vhost_dev_disable_notifiers(&i2c->vhost_dev, vdev);
}
static void vu_i2c_stop(VirtIODevice *vdev)
{
VHostUserI2C *i2c = VHOST_USER_I2C(vdev);
BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
int ret;
if (!k->set_guest_notifiers) {
return;
}
vhost_dev_stop(&i2c->vhost_dev, vdev, true);
ret = k->set_guest_notifiers(qbus->parent, i2c->vhost_dev.nvqs, false);
if (ret < 0) {
error_report("vhost guest notifier cleanup failed: %d", ret);
return;
}
vhost_dev_disable_notifiers(&i2c->vhost_dev, vdev);
}
static void vu_i2c_set_status(VirtIODevice *vdev, uint8_t status)
{
VHostUserI2C *i2c = VHOST_USER_I2C(vdev);
bool should_start = virtio_device_should_start(vdev, status);
if (vhost_dev_is_started(&i2c->vhost_dev) == should_start) {
return;
}
if (should_start) {
vu_i2c_start(vdev);
} else {
vu_i2c_stop(vdev);
}
}
static uint64_t vu_i2c_get_features(VirtIODevice *vdev,
uint64_t requested_features, Error **errp)
{
VHostUserI2C *i2c = VHOST_USER_I2C(vdev);
virtio_add_feature(&requested_features, VIRTIO_I2C_F_ZERO_LENGTH_REQUEST);
return vhost_get_features(&i2c->vhost_dev, feature_bits, requested_features);
}
static void vu_i2c_handle_output(VirtIODevice *vdev, VirtQueue *vq)
{
/*
* Not normally called; it's the daemon that handles the queue;
* however virtio's cleanup path can call this.
*/
}
static void vu_i2c_guest_notifier_mask(VirtIODevice *vdev, int idx, bool mask)
{
VHostUserI2C *i2c = VHOST_USER_I2C(vdev);
vhost_virtqueue_mask(&i2c->vhost_dev, vdev, idx, mask);
}
static bool vu_i2c_guest_notifier_pending(VirtIODevice *vdev, int idx)
{
VHostUserI2C *i2c = VHOST_USER_I2C(vdev);
return vhost_virtqueue_pending(&i2c->vhost_dev, idx);
}
static void do_vhost_user_cleanup(VirtIODevice *vdev, VHostUserI2C *i2c)
{
vhost_user_cleanup(&i2c->vhost_user);
virtio_delete_queue(i2c->vq);
virtio_cleanup(vdev);
}
static int vu_i2c_connect(DeviceState *dev)
{
VirtIODevice *vdev = VIRTIO_DEVICE(dev);
VHostUserI2C *i2c = VHOST_USER_I2C(vdev);
if (i2c->connected) {
return 0;
}
i2c->connected = true;
/* restore vhost state */
if (virtio_device_started(vdev, vdev->status)) {
vu_i2c_start(vdev);
}
return 0;
}
static void vu_i2c_disconnect(DeviceState *dev)
{
VirtIODevice *vdev = VIRTIO_DEVICE(dev);
VHostUserI2C *i2c = VHOST_USER_I2C(vdev);
if (!i2c->connected) {
return;
}
i2c->connected = false;
if (vhost_dev_is_started(&i2c->vhost_dev)) {
vu_i2c_stop(vdev);
}
}
static void vu_i2c_event(void *opaque, QEMUChrEvent event)
{
DeviceState *dev = opaque;
VirtIODevice *vdev = VIRTIO_DEVICE(dev);
VHostUserI2C *i2c = VHOST_USER_I2C(vdev);
switch (event) {
case CHR_EVENT_OPENED:
if (vu_i2c_connect(dev) < 0) {
qemu_chr_fe_disconnect(&i2c->chardev);
return;
}
break;
case CHR_EVENT_CLOSED:
vu_i2c_disconnect(dev);
break;
case CHR_EVENT_BREAK:
case CHR_EVENT_MUX_IN:
case CHR_EVENT_MUX_OUT:
/* Ignore */
break;
}
}
static void vu_i2c_device_realize(DeviceState *dev, Error **errp)
{
VirtIODevice *vdev = VIRTIO_DEVICE(dev);
VHostUserI2C *i2c = VHOST_USER_I2C(dev);
int ret;
if (!i2c->chardev.chr) {
error_setg(errp, "vhost-user-i2c: missing chardev");
return;
}
if (!vhost_user_init(&i2c->vhost_user, &i2c->chardev, errp)) {
return;
}
virtio_init(vdev, VIRTIO_ID_I2C_ADAPTER, 0);
i2c->vhost_dev.nvqs = 1;
i2c->vq = virtio_add_queue(vdev, 4, vu_i2c_handle_output);
i2c->vhost_dev.vqs = g_new0(struct vhost_virtqueue, i2c->vhost_dev.nvqs);
ret = vhost_dev_init(&i2c->vhost_dev, &i2c->vhost_user,
VHOST_BACKEND_TYPE_USER, 0, errp);
if (ret < 0) {
g_free(i2c->vhost_dev.vqs);
do_vhost_user_cleanup(vdev, i2c);
}
qemu_chr_fe_set_handlers(&i2c->chardev, NULL, NULL, vu_i2c_event, NULL,
dev, NULL, true);
}
static void vu_i2c_device_unrealize(DeviceState *dev)
{
VirtIODevice *vdev = VIRTIO_DEVICE(dev);
VHostUserI2C *i2c = VHOST_USER_I2C(dev);
struct vhost_virtqueue *vhost_vqs = i2c->vhost_dev.vqs;
/* This will stop vhost backend if appropriate. */
vu_i2c_set_status(vdev, 0);
vhost_dev_cleanup(&i2c->vhost_dev);
g_free(vhost_vqs);
do_vhost_user_cleanup(vdev, i2c);
}
static const VMStateDescription vu_i2c_vmstate = {
.name = "vhost-user-i2c",
.unmigratable = 1,
};
static Property vu_i2c_properties[] = {
DEFINE_PROP_CHR("chardev", VHostUserI2C, chardev),
DEFINE_PROP_END_OF_LIST(),
};
static void vu_i2c_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
device_class_set_props(dc, vu_i2c_properties);
dc->vmsd = &vu_i2c_vmstate;
set_bit(DEVICE_CATEGORY_INPUT, dc->categories);
vdc->realize = vu_i2c_device_realize;
vdc->unrealize = vu_i2c_device_unrealize;
vdc->get_features = vu_i2c_get_features;
vdc->set_status = vu_i2c_set_status;
vdc->guest_notifier_mask = vu_i2c_guest_notifier_mask;
vdc->guest_notifier_pending = vu_i2c_guest_notifier_pending;
}
static const TypeInfo vu_i2c_info = {
.name = TYPE_VHOST_USER_I2C,
.parent = TYPE_VIRTIO_DEVICE,
.instance_size = sizeof(VHostUserI2C),
.class_init = vu_i2c_class_init,
};
static void vu_i2c_register_types(void)
{
type_register_static(&vu_i2c_info);
}
type_init(vu_i2c_register_types)
|