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ff8eca55 FK |
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 | ||
9b8bfe21 | 25 | #include "qemu/osdep.h" |
ff8eca55 | 26 | #include "qemu/error-report.h" |
0b8fa32f | 27 | #include "qemu/module.h" |
a77690c4 | 28 | #include "qapi/error.h" |
0d09e41a PB |
29 | #include "hw/virtio/virtio-bus.h" |
30 | #include "hw/virtio/virtio.h" | |
8607f5c3 | 31 | #include "exec/address-spaces.h" |
ff8eca55 FK |
32 | |
33 | /* #define DEBUG_VIRTIO_BUS */ | |
34 | ||
35 | #ifdef DEBUG_VIRTIO_BUS | |
36 | #define DPRINTF(fmt, ...) \ | |
37 | do { printf("virtio_bus: " fmt , ## __VA_ARGS__); } while (0) | |
38 | #else | |
39 | #define DPRINTF(fmt, ...) do { } while (0) | |
40 | #endif | |
41 | ||
5e96f5d2 | 42 | /* A VirtIODevice is being plugged */ |
e8398045 | 43 | void virtio_bus_device_plugged(VirtIODevice *vdev, Error **errp) |
ff8eca55 FK |
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); | |
6b8f1020 | 49 | VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev); |
2943b53f | 50 | bool has_iommu = virtio_host_has_feature(vdev, VIRTIO_F_IOMMU_PLATFORM); |
a77690c4 | 51 | Error *local_err = NULL; |
6b8f1020 | 52 | |
ff8eca55 FK |
53 | DPRINTF("%s: plug device.\n", qbus->name); |
54 | ||
d1b4259f | 55 | if (klass->pre_plugged != NULL) { |
a77690c4 FZ |
56 | klass->pre_plugged(qbus->parent, &local_err); |
57 | if (local_err) { | |
58 | error_propagate(errp, local_err); | |
59 | return; | |
60 | } | |
ff8eca55 FK |
61 | } |
62 | ||
6b8f1020 CH |
63 | /* Get the features of the plugged device. */ |
64 | assert(vdc->get_features != NULL); | |
9d5b731d | 65 | vdev->host_features = vdc->get_features(vdev, vdev->host_features, |
a77690c4 FZ |
66 | &local_err); |
67 | if (local_err) { | |
68 | error_propagate(errp, local_err); | |
69 | return; | |
70 | } | |
d1b4259f MC |
71 | |
72 | if (klass->device_plugged != NULL) { | |
a77690c4 FZ |
73 | klass->device_plugged(qbus->parent, &local_err); |
74 | } | |
75 | if (local_err) { | |
76 | error_propagate(errp, local_err); | |
77 | return; | |
11380b36 | 78 | } |
8607f5c3 | 79 | |
2943b53f JW |
80 | if (klass->get_dma_as != NULL && has_iommu) { |
81 | virtio_add_feature(&vdev->host_features, VIRTIO_F_IOMMU_PLATFORM); | |
8607f5c3 JW |
82 | vdev->dma_as = klass->get_dma_as(qbus->parent); |
83 | } else { | |
84 | vdev->dma_as = &address_space_memory; | |
85 | } | |
ff8eca55 FK |
86 | } |
87 | ||
88 | /* Reset the virtio_bus */ | |
89 | void virtio_bus_reset(VirtioBusState *bus) | |
90 | { | |
06d3dff0 PB |
91 | VirtIODevice *vdev = virtio_bus_get_device(bus); |
92 | ||
2c80ab15 | 93 | DPRINTF("%s: reset device.\n", BUS(bus)->name); |
06d3dff0 PB |
94 | if (vdev != NULL) { |
95 | virtio_reset(vdev); | |
ff8eca55 FK |
96 | } |
97 | } | |
98 | ||
5e96f5d2 PB |
99 | /* A VirtIODevice is being unplugged */ |
100 | void virtio_bus_device_unplugged(VirtIODevice *vdev) | |
ff8eca55 | 101 | { |
5e96f5d2 PB |
102 | DeviceState *qdev = DEVICE(vdev); |
103 | BusState *qbus = BUS(qdev_get_parent_bus(qdev)); | |
104 | VirtioBusClass *klass = VIRTIO_BUS_GET_CLASS(qbus); | |
06d3dff0 | 105 | |
ff8eca55 FK |
106 | DPRINTF("%s: remove device.\n", qbus->name); |
107 | ||
06d3dff0 | 108 | if (vdev != NULL) { |
5e96f5d2 PB |
109 | if (klass->device_unplugged != NULL) { |
110 | klass->device_unplugged(qbus->parent); | |
ff8eca55 | 111 | } |
ff8eca55 FK |
112 | } |
113 | } | |
114 | ||
115 | /* Get the device id of the plugged device. */ | |
116 | uint16_t virtio_bus_get_vdev_id(VirtioBusState *bus) | |
117 | { | |
06d3dff0 PB |
118 | VirtIODevice *vdev = virtio_bus_get_device(bus); |
119 | assert(vdev != NULL); | |
120 | return vdev->device_id; | |
ff8eca55 FK |
121 | } |
122 | ||
123 | /* Get the config_len field of the plugged device. */ | |
124 | size_t virtio_bus_get_vdev_config_len(VirtioBusState *bus) | |
125 | { | |
06d3dff0 PB |
126 | VirtIODevice *vdev = virtio_bus_get_device(bus); |
127 | assert(vdev != NULL); | |
128 | return vdev->config_len; | |
ff8eca55 FK |
129 | } |
130 | ||
8e05db92 FK |
131 | /* Get bad features of the plugged device. */ |
132 | uint32_t virtio_bus_get_vdev_bad_features(VirtioBusState *bus) | |
133 | { | |
06d3dff0 | 134 | VirtIODevice *vdev = virtio_bus_get_device(bus); |
8e05db92 | 135 | VirtioDeviceClass *k; |
06d3dff0 PB |
136 | |
137 | assert(vdev != NULL); | |
138 | k = VIRTIO_DEVICE_GET_CLASS(vdev); | |
8e05db92 | 139 | if (k->bad_features != NULL) { |
06d3dff0 | 140 | return k->bad_features(vdev); |
8e05db92 FK |
141 | } else { |
142 | return 0; | |
143 | } | |
144 | } | |
145 | ||
146 | /* Get config of the plugged device. */ | |
147 | void virtio_bus_get_vdev_config(VirtioBusState *bus, uint8_t *config) | |
148 | { | |
06d3dff0 | 149 | VirtIODevice *vdev = virtio_bus_get_device(bus); |
8e05db92 | 150 | VirtioDeviceClass *k; |
06d3dff0 PB |
151 | |
152 | assert(vdev != NULL); | |
153 | k = VIRTIO_DEVICE_GET_CLASS(vdev); | |
8e05db92 | 154 | if (k->get_config != NULL) { |
06d3dff0 | 155 | k->get_config(vdev, config); |
8e05db92 FK |
156 | } |
157 | } | |
158 | ||
5d448f9d FK |
159 | /* Set config of the plugged device. */ |
160 | void virtio_bus_set_vdev_config(VirtioBusState *bus, uint8_t *config) | |
161 | { | |
06d3dff0 | 162 | VirtIODevice *vdev = virtio_bus_get_device(bus); |
5d448f9d | 163 | VirtioDeviceClass *k; |
06d3dff0 PB |
164 | |
165 | assert(vdev != NULL); | |
166 | k = VIRTIO_DEVICE_GET_CLASS(vdev); | |
5d448f9d | 167 | if (k->set_config != NULL) { |
06d3dff0 | 168 | k->set_config(vdev, config); |
5d448f9d FK |
169 | } |
170 | } | |
171 | ||
310837de PB |
172 | /* On success, ioeventfd ownership belongs to the caller. */ |
173 | int virtio_bus_grab_ioeventfd(VirtioBusState *bus) | |
174 | { | |
175 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(bus); | |
176 | ||
177 | /* vhost can be used even if ioeventfd=off in the proxy device, | |
178 | * so do not check k->ioeventfd_enabled. | |
179 | */ | |
180 | if (!k->ioeventfd_assign) { | |
181 | return -ENOSYS; | |
182 | } | |
183 | ||
184 | if (bus->ioeventfd_grabbed == 0 && bus->ioeventfd_started) { | |
185 | virtio_bus_stop_ioeventfd(bus); | |
186 | /* Remember that we need to restart ioeventfd | |
187 | * when ioeventfd_grabbed becomes zero. | |
188 | */ | |
189 | bus->ioeventfd_started = true; | |
190 | } | |
191 | bus->ioeventfd_grabbed++; | |
192 | return 0; | |
193 | } | |
194 | ||
195 | void virtio_bus_release_ioeventfd(VirtioBusState *bus) | |
196 | { | |
197 | assert(bus->ioeventfd_grabbed != 0); | |
198 | if (--bus->ioeventfd_grabbed == 0 && bus->ioeventfd_started) { | |
199 | /* Force virtio_bus_start_ioeventfd to act. */ | |
200 | bus->ioeventfd_started = false; | |
201 | virtio_bus_start_ioeventfd(bus); | |
202 | } | |
203 | } | |
204 | ||
ff4c07df | 205 | int virtio_bus_start_ioeventfd(VirtioBusState *bus) |
6798e245 CH |
206 | { |
207 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(bus); | |
208 | DeviceState *proxy = DEVICE(BUS(bus)->parent); | |
ff4c07df PB |
209 | VirtIODevice *vdev = virtio_bus_get_device(bus); |
210 | VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev); | |
211 | int r; | |
6798e245 | 212 | |
8e93cef1 | 213 | if (!k->ioeventfd_assign || !k->ioeventfd_enabled(proxy)) { |
ff4c07df | 214 | return -ENOSYS; |
6798e245 | 215 | } |
e616c2f3 | 216 | if (bus->ioeventfd_started) { |
ff4c07df | 217 | return 0; |
6798e245 | 218 | } |
310837de PB |
219 | |
220 | /* Only set our notifier if we have ownership. */ | |
221 | if (!bus->ioeventfd_grabbed) { | |
222 | r = vdc->start_ioeventfd(vdev); | |
223 | if (r < 0) { | |
224 | error_report("%s: failed. Fallback to userspace (slower).", __func__); | |
225 | return r; | |
226 | } | |
6798e245 | 227 | } |
b13d3962 | 228 | bus->ioeventfd_started = true; |
ff4c07df | 229 | return 0; |
6798e245 CH |
230 | } |
231 | ||
232 | void virtio_bus_stop_ioeventfd(VirtioBusState *bus) | |
233 | { | |
6798e245 | 234 | VirtIODevice *vdev; |
ff4c07df | 235 | VirtioDeviceClass *vdc; |
6798e245 | 236 | |
b13d3962 | 237 | if (!bus->ioeventfd_started) { |
6798e245 CH |
238 | return; |
239 | } | |
ff4c07df | 240 | |
310837de PB |
241 | /* Only remove our notifier if we have ownership. */ |
242 | if (!bus->ioeventfd_grabbed) { | |
243 | vdev = virtio_bus_get_device(bus); | |
244 | vdc = VIRTIO_DEVICE_GET_CLASS(vdev); | |
245 | vdc->stop_ioeventfd(vdev); | |
246 | } | |
b13d3962 | 247 | bus->ioeventfd_started = false; |
6798e245 CH |
248 | } |
249 | ||
8e93cef1 PB |
250 | bool virtio_bus_ioeventfd_enabled(VirtioBusState *bus) |
251 | { | |
252 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(bus); | |
253 | DeviceState *proxy = DEVICE(BUS(bus)->parent); | |
254 | ||
255 | return k->ioeventfd_assign && k->ioeventfd_enabled(proxy); | |
256 | } | |
257 | ||
6798e245 | 258 | /* |
e616c2f3 PB |
259 | * This function switches ioeventfd on/off in the device. |
260 | * The caller must set or clear the handlers for the EventNotifier. | |
6798e245 CH |
261 | */ |
262 | int virtio_bus_set_host_notifier(VirtioBusState *bus, int n, bool assign) | |
263 | { | |
2bd3c31a | 264 | VirtIODevice *vdev = virtio_bus_get_device(bus); |
6798e245 CH |
265 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(bus); |
266 | DeviceState *proxy = DEVICE(BUS(bus)->parent); | |
2bd3c31a PB |
267 | VirtQueue *vq = virtio_get_queue(vdev, n); |
268 | EventNotifier *notifier = virtio_queue_get_host_notifier(vq); | |
269 | int r = 0; | |
6798e245 | 270 | |
b13d3962 | 271 | if (!k->ioeventfd_assign) { |
6798e245 CH |
272 | return -ENOSYS; |
273 | } | |
2bd3c31a | 274 | |
6798e245 | 275 | if (assign) { |
2bd3c31a PB |
276 | r = event_notifier_init(notifier, 1); |
277 | if (r < 0) { | |
278 | error_report("%s: unable to init event notifier: %s (%d)", | |
279 | __func__, strerror(-r), r); | |
280 | return r; | |
281 | } | |
282 | r = k->ioeventfd_assign(proxy, notifier, n, true); | |
283 | if (r < 0) { | |
284 | error_report("%s: unable to assign ioeventfd: %d", __func__, r); | |
76143618 | 285 | virtio_bus_cleanup_host_notifier(bus, n); |
2bd3c31a | 286 | } |
e616c2f3 | 287 | } else { |
2bd3c31a | 288 | k->ioeventfd_assign(proxy, notifier, n, false); |
6798e245 | 289 | } |
2bd3c31a | 290 | |
fcccb271 SH |
291 | if (r == 0) { |
292 | virtio_queue_set_host_notifier_enabled(vq, assign); | |
293 | } | |
294 | ||
76143618 GH |
295 | return r; |
296 | } | |
297 | ||
298 | void virtio_bus_cleanup_host_notifier(VirtioBusState *bus, int n) | |
299 | { | |
300 | VirtIODevice *vdev = virtio_bus_get_device(bus); | |
301 | VirtQueue *vq = virtio_get_queue(vdev, n); | |
302 | EventNotifier *notifier = virtio_queue_get_host_notifier(vq); | |
303 | ||
1ef8185a MT |
304 | /* Test and clear notifier after disabling event, |
305 | * in case poll callback didn't have time to run. | |
306 | */ | |
307 | virtio_queue_host_notifier_read(notifier); | |
308 | event_notifier_cleanup(notifier); | |
6798e245 CH |
309 | } |
310 | ||
6d46895b FK |
311 | static char *virtio_bus_get_dev_path(DeviceState *dev) |
312 | { | |
313 | BusState *bus = qdev_get_parent_bus(dev); | |
314 | DeviceState *proxy = DEVICE(bus->parent); | |
315 | return qdev_get_dev_path(proxy); | |
316 | } | |
317 | ||
bbfa18fc AK |
318 | static char *virtio_bus_get_fw_dev_path(DeviceState *dev) |
319 | { | |
320 | return NULL; | |
321 | } | |
322 | ||
6d46895b FK |
323 | static void virtio_bus_class_init(ObjectClass *klass, void *data) |
324 | { | |
325 | BusClass *bus_class = BUS_CLASS(klass); | |
326 | bus_class->get_dev_path = virtio_bus_get_dev_path; | |
bbfa18fc | 327 | bus_class->get_fw_dev_path = virtio_bus_get_fw_dev_path; |
6d46895b FK |
328 | } |
329 | ||
ff8eca55 FK |
330 | static const TypeInfo virtio_bus_info = { |
331 | .name = TYPE_VIRTIO_BUS, | |
332 | .parent = TYPE_BUS, | |
333 | .instance_size = sizeof(VirtioBusState), | |
334 | .abstract = true, | |
335 | .class_size = sizeof(VirtioBusClass), | |
6d46895b | 336 | .class_init = virtio_bus_class_init |
ff8eca55 FK |
337 | }; |
338 | ||
339 | static void virtio_register_types(void) | |
340 | { | |
341 | type_register_static(&virtio_bus_info); | |
342 | } | |
343 | ||
344 | type_init(virtio_register_types) |