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25#include "qemu/osdep.h"
26#include "qemu/error-report.h"
27#include "qemu/module.h"
28#include "qapi/error.h"
29#include "hw/virtio/virtio-bus.h"
30#include "hw/virtio/virtio.h"
31#include "exec/address-spaces.h"
32
33
34
35#ifdef DEBUG_VIRTIO_BUS
36#define DPRINTF(fmt, ...) \
37do { printf("virtio_bus: " fmt , ## __VA_ARGS__); } while (0)
38#else
39#define DPRINTF(fmt, ...) do { } while (0)
40#endif
41
42
43void virtio_bus_device_plugged(VirtIODevice *vdev, Error **errp)
44{
45 DeviceState *qdev = DEVICE(vdev);
46 BusState *qbus = BUS(qdev_get_parent_bus(qdev));
47 VirtioBusState *bus = VIRTIO_BUS(qbus);
48 VirtioBusClass *klass = VIRTIO_BUS_GET_CLASS(bus);
49 VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev);
50 bool has_iommu = virtio_host_has_feature(vdev, VIRTIO_F_IOMMU_PLATFORM);
51 Error *local_err = NULL;
52
53 DPRINTF("%s: plug device.\n", qbus->name);
54
55 if (klass->pre_plugged != NULL) {
56 klass->pre_plugged(qbus->parent, &local_err);
57 if (local_err) {
58 error_propagate(errp, local_err);
59 return;
60 }
61 }
62
63
64 assert(vdc->get_features != NULL);
65 vdev->host_features = vdc->get_features(vdev, vdev->host_features,
66 &local_err);
67 if (local_err) {
68 error_propagate(errp, local_err);
69 return;
70 }
71
72 if (has_iommu && !virtio_host_has_feature(vdev, VIRTIO_F_IOMMU_PLATFORM)) {
73 error_setg(errp, "iommu_platform=true is not supported by the device");
74 return;
75 }
76
77 if (klass->device_plugged != NULL) {
78 klass->device_plugged(qbus->parent, &local_err);
79 }
80 if (local_err) {
81 error_propagate(errp, local_err);
82 return;
83 }
84
85 if (klass->get_dma_as != NULL && has_iommu) {
86 virtio_add_feature(&vdev->host_features, VIRTIO_F_IOMMU_PLATFORM);
87 vdev->dma_as = klass->get_dma_as(qbus->parent);
88 } else {
89 vdev->dma_as = &address_space_memory;
90 }
91}
92
93
94void virtio_bus_reset(VirtioBusState *bus)
95{
96 VirtIODevice *vdev = virtio_bus_get_device(bus);
97
98 DPRINTF("%s: reset device.\n", BUS(bus)->name);
99 if (vdev != NULL) {
100 virtio_reset(vdev);
101 }
102}
103
104
105void virtio_bus_device_unplugged(VirtIODevice *vdev)
106{
107 DeviceState *qdev = DEVICE(vdev);
108 BusState *qbus = BUS(qdev_get_parent_bus(qdev));
109 VirtioBusClass *klass = VIRTIO_BUS_GET_CLASS(qbus);
110
111 DPRINTF("%s: remove device.\n", qbus->name);
112
113 if (vdev != NULL) {
114 if (klass->device_unplugged != NULL) {
115 klass->device_unplugged(qbus->parent);
116 }
117 }
118}
119
120
121uint16_t virtio_bus_get_vdev_id(VirtioBusState *bus)
122{
123 VirtIODevice *vdev = virtio_bus_get_device(bus);
124 assert(vdev != NULL);
125 return vdev->device_id;
126}
127
128
129size_t virtio_bus_get_vdev_config_len(VirtioBusState *bus)
130{
131 VirtIODevice *vdev = virtio_bus_get_device(bus);
132 assert(vdev != NULL);
133 return vdev->config_len;
134}
135
136
137uint32_t virtio_bus_get_vdev_bad_features(VirtioBusState *bus)
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->bad_features != NULL) {
145 return k->bad_features(vdev);
146 } else {
147 return 0;
148 }
149}
150
151
152void virtio_bus_get_vdev_config(VirtioBusState *bus, uint8_t *config)
153{
154 VirtIODevice *vdev = virtio_bus_get_device(bus);
155 VirtioDeviceClass *k;
156
157 assert(vdev != NULL);
158 k = VIRTIO_DEVICE_GET_CLASS(vdev);
159 if (k->get_config != NULL) {
160 k->get_config(vdev, config);
161 }
162}
163
164
165void virtio_bus_set_vdev_config(VirtioBusState *bus, uint8_t *config)
166{
167 VirtIODevice *vdev = virtio_bus_get_device(bus);
168 VirtioDeviceClass *k;
169
170 assert(vdev != NULL);
171 k = VIRTIO_DEVICE_GET_CLASS(vdev);
172 if (k->set_config != NULL) {
173 k->set_config(vdev, config);
174 }
175}
176
177
178int virtio_bus_grab_ioeventfd(VirtioBusState *bus)
179{
180 VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(bus);
181
182
183
184
185 if (!k->ioeventfd_assign) {
186 return -ENOSYS;
187 }
188
189 if (bus->ioeventfd_grabbed == 0 && bus->ioeventfd_started) {
190 virtio_bus_stop_ioeventfd(bus);
191
192
193
194 bus->ioeventfd_started = true;
195 }
196 bus->ioeventfd_grabbed++;
197 return 0;
198}
199
200void virtio_bus_release_ioeventfd(VirtioBusState *bus)
201{
202 assert(bus->ioeventfd_grabbed != 0);
203 if (--bus->ioeventfd_grabbed == 0 && bus->ioeventfd_started) {
204
205 bus->ioeventfd_started = false;
206 virtio_bus_start_ioeventfd(bus);
207 }
208}
209
210int virtio_bus_start_ioeventfd(VirtioBusState *bus)
211{
212 VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(bus);
213 DeviceState *proxy = DEVICE(BUS(bus)->parent);
214 VirtIODevice *vdev = virtio_bus_get_device(bus);
215 VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev);
216 int r;
217
218 if (!k->ioeventfd_assign || !k->ioeventfd_enabled(proxy)) {
219 return -ENOSYS;
220 }
221 if (bus->ioeventfd_started) {
222 return 0;
223 }
224
225
226 if (!bus->ioeventfd_grabbed) {
227 r = vdc->start_ioeventfd(vdev);
228 if (r < 0) {
229 error_report("%s: failed. Fallback to userspace (slower).", __func__);
230 return r;
231 }
232 }
233 bus->ioeventfd_started = true;
234 return 0;
235}
236
237void virtio_bus_stop_ioeventfd(VirtioBusState *bus)
238{
239 VirtIODevice *vdev;
240 VirtioDeviceClass *vdc;
241
242 if (!bus->ioeventfd_started) {
243 return;
244 }
245
246
247 if (!bus->ioeventfd_grabbed) {
248 vdev = virtio_bus_get_device(bus);
249 vdc = VIRTIO_DEVICE_GET_CLASS(vdev);
250 vdc->stop_ioeventfd(vdev);
251 }
252 bus->ioeventfd_started = false;
253}
254
255bool virtio_bus_ioeventfd_enabled(VirtioBusState *bus)
256{
257 VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(bus);
258 DeviceState *proxy = DEVICE(BUS(bus)->parent);
259
260 return k->ioeventfd_assign && k->ioeventfd_enabled(proxy);
261}
262
263
264
265
266
267int virtio_bus_set_host_notifier(VirtioBusState *bus, int n, bool assign)
268{
269 VirtIODevice *vdev = virtio_bus_get_device(bus);
270 VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(bus);
271 DeviceState *proxy = DEVICE(BUS(bus)->parent);
272 VirtQueue *vq = virtio_get_queue(vdev, n);
273 EventNotifier *notifier = virtio_queue_get_host_notifier(vq);
274 int r = 0;
275
276 if (!k->ioeventfd_assign) {
277 return -ENOSYS;
278 }
279
280 if (assign) {
281 r = event_notifier_init(notifier, 1);
282 if (r < 0) {
283 error_report("%s: unable to init event notifier: %s (%d)",
284 __func__, strerror(-r), r);
285 return r;
286 }
287 r = k->ioeventfd_assign(proxy, notifier, n, true);
288 if (r < 0) {
289 error_report("%s: unable to assign ioeventfd: %d", __func__, r);
290 virtio_bus_cleanup_host_notifier(bus, n);
291 }
292 } else {
293 k->ioeventfd_assign(proxy, notifier, n, false);
294 }
295
296 if (r == 0) {
297 virtio_queue_set_host_notifier_enabled(vq, assign);
298 }
299
300 return r;
301}
302
303void virtio_bus_cleanup_host_notifier(VirtioBusState *bus, int n)
304{
305 VirtIODevice *vdev = virtio_bus_get_device(bus);
306 VirtQueue *vq = virtio_get_queue(vdev, n);
307 EventNotifier *notifier = virtio_queue_get_host_notifier(vq);
308
309
310
311
312 virtio_queue_host_notifier_read(notifier);
313 event_notifier_cleanup(notifier);
314}
315
316static char *virtio_bus_get_dev_path(DeviceState *dev)
317{
318 BusState *bus = qdev_get_parent_bus(dev);
319 DeviceState *proxy = DEVICE(bus->parent);
320 return qdev_get_dev_path(proxy);
321}
322
323static char *virtio_bus_get_fw_dev_path(DeviceState *dev)
324{
325 return NULL;
326}
327
328bool virtio_bus_device_iommu_enabled(VirtIODevice *vdev)
329{
330 DeviceState *qdev = DEVICE(vdev);
331 BusState *qbus = BUS(qdev_get_parent_bus(qdev));
332 VirtioBusState *bus = VIRTIO_BUS(qbus);
333 VirtioBusClass *klass = VIRTIO_BUS_GET_CLASS(bus);
334
335 if (!klass->iommu_enabled) {
336 return false;
337 }
338
339 return klass->iommu_enabled(qbus->parent);
340}
341
342static void virtio_bus_class_init(ObjectClass *klass, void *data)
343{
344 BusClass *bus_class = BUS_CLASS(klass);
345 bus_class->get_dev_path = virtio_bus_get_dev_path;
346 bus_class->get_fw_dev_path = virtio_bus_get_fw_dev_path;
347}
348
349static const TypeInfo virtio_bus_info = {
350 .name = TYPE_VIRTIO_BUS,
351 .parent = TYPE_BUS,
352 .instance_size = sizeof(VirtioBusState),
353 .abstract = true,
354 .class_size = sizeof(VirtioBusClass),
355 .class_init = virtio_bus_class_init
356};
357
358static void virtio_register_types(void)
359{
360 type_register_static(&virtio_bus_info);
361}
362
363type_init(virtio_register_types)
364