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Commit | Line | Data |
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108f7bba PD |
1 | /* |
2 | * Copyright (c) 2018 Citrix Systems Inc. | |
3 | * | |
4 | * This work is licensed under the terms of the GNU GPL, version 2 or later. | |
5 | * See the COPYING file in the top-level directory. | |
6 | */ | |
7 | ||
8 | #include "qemu/osdep.h" | |
82a29e30 | 9 | #include "qemu/main-loop.h" |
0b8fa32f | 10 | #include "qemu/module.h" |
82a29e30 | 11 | #include "qemu/uuid.h" |
a27bd6c7 | 12 | #include "hw/qdev-properties.h" |
108f7bba | 13 | #include "hw/sysbus.h" |
094a2239 | 14 | #include "hw/xen/xen.h" |
a783f8ad | 15 | #include "hw/xen/xen-backend.h" |
108f7bba | 16 | #include "hw/xen/xen-bus.h" |
094a2239 PD |
17 | #include "hw/xen/xen-bus-helper.h" |
18 | #include "monitor/monitor.h" | |
108f7bba | 19 | #include "qapi/error.h" |
a783f8ad | 20 | #include "qapi/qmp/qdict.h" |
094a2239 | 21 | #include "sysemu/sysemu.h" |
108f7bba PD |
22 | #include "trace.h" |
23 | ||
094a2239 PD |
24 | static char *xen_device_get_backend_path(XenDevice *xendev) |
25 | { | |
26 | XenBus *xenbus = XEN_BUS(qdev_get_parent_bus(DEVICE(xendev))); | |
27 | XenDeviceClass *xendev_class = XEN_DEVICE_GET_CLASS(xendev); | |
28 | const char *type = object_get_typename(OBJECT(xendev)); | |
29 | const char *backend = xendev_class->backend; | |
30 | ||
31 | if (!backend) { | |
32 | backend = type; | |
33 | } | |
34 | ||
35 | return g_strdup_printf("/local/domain/%u/backend/%s/%u/%s", | |
36 | xenbus->backend_id, backend, xendev->frontend_id, | |
37 | xendev->name); | |
38 | } | |
39 | ||
40 | static char *xen_device_get_frontend_path(XenDevice *xendev) | |
41 | { | |
42 | XenDeviceClass *xendev_class = XEN_DEVICE_GET_CLASS(xendev); | |
43 | const char *type = object_get_typename(OBJECT(xendev)); | |
44 | const char *device = xendev_class->device; | |
45 | ||
46 | if (!device) { | |
47 | device = type; | |
48 | } | |
49 | ||
50 | return g_strdup_printf("/local/domain/%u/device/%s/%s", | |
51 | xendev->frontend_id, device, xendev->name); | |
52 | } | |
53 | ||
b6af8926 PD |
54 | static void xen_device_unplug(XenDevice *xendev, Error **errp) |
55 | { | |
56 | XenBus *xenbus = XEN_BUS(qdev_get_parent_bus(DEVICE(xendev))); | |
57 | const char *type = object_get_typename(OBJECT(xendev)); | |
58 | Error *local_err = NULL; | |
59 | xs_transaction_t tid; | |
60 | ||
61 | trace_xen_device_unplug(type, xendev->name); | |
62 | ||
63 | /* Mimic the way the Xen toolstack does an unplug */ | |
64 | again: | |
65 | tid = xs_transaction_start(xenbus->xsh); | |
66 | if (tid == XBT_NULL) { | |
67 | error_setg_errno(errp, errno, "failed xs_transaction_start"); | |
68 | return; | |
69 | } | |
70 | ||
71 | xs_node_printf(xenbus->xsh, tid, xendev->backend_path, "online", | |
72 | &local_err, "%u", 0); | |
73 | if (local_err) { | |
74 | goto abort; | |
75 | } | |
76 | ||
77 | xs_node_printf(xenbus->xsh, tid, xendev->backend_path, "state", | |
78 | &local_err, "%u", XenbusStateClosing); | |
79 | if (local_err) { | |
80 | goto abort; | |
81 | } | |
82 | ||
83 | if (!xs_transaction_end(xenbus->xsh, tid, false)) { | |
84 | if (errno == EAGAIN) { | |
85 | goto again; | |
86 | } | |
87 | ||
88 | error_setg_errno(errp, errno, "failed xs_transaction_end"); | |
89 | } | |
90 | ||
91 | return; | |
92 | ||
93 | abort: | |
94 | /* | |
95 | * We only abort if there is already a failure so ignore any error | |
96 | * from ending the transaction. | |
97 | */ | |
98 | xs_transaction_end(xenbus->xsh, tid, true); | |
99 | error_propagate(errp, local_err); | |
100 | } | |
101 | ||
094a2239 PD |
102 | static void xen_bus_print_dev(Monitor *mon, DeviceState *dev, int indent) |
103 | { | |
104 | XenDevice *xendev = XEN_DEVICE(dev); | |
105 | ||
106 | monitor_printf(mon, "%*sname = '%s' frontend_id = %u\n", | |
107 | indent, "", xendev->name, xendev->frontend_id); | |
108 | } | |
109 | ||
110 | static char *xen_bus_get_dev_path(DeviceState *dev) | |
111 | { | |
112 | return xen_device_get_backend_path(XEN_DEVICE(dev)); | |
113 | } | |
114 | ||
82a29e30 PD |
115 | struct XenWatch { |
116 | char *node, *key; | |
117 | char *token; | |
118 | XenWatchHandler handler; | |
119 | void *opaque; | |
120 | Notifier notifier; | |
121 | }; | |
122 | ||
123 | static void watch_notify(Notifier *n, void *data) | |
124 | { | |
125 | XenWatch *watch = container_of(n, XenWatch, notifier); | |
126 | const char *token = data; | |
127 | ||
128 | if (!strcmp(watch->token, token)) { | |
129 | watch->handler(watch->opaque); | |
130 | } | |
131 | } | |
132 | ||
133 | static XenWatch *new_watch(const char *node, const char *key, | |
134 | XenWatchHandler handler, void *opaque) | |
135 | { | |
136 | XenWatch *watch = g_new0(XenWatch, 1); | |
137 | QemuUUID uuid; | |
138 | ||
139 | qemu_uuid_generate(&uuid); | |
140 | ||
141 | watch->token = qemu_uuid_unparse_strdup(&uuid); | |
142 | watch->node = g_strdup(node); | |
143 | watch->key = g_strdup(key); | |
144 | watch->handler = handler; | |
145 | watch->opaque = opaque; | |
146 | watch->notifier.notify = watch_notify; | |
147 | ||
148 | return watch; | |
149 | } | |
150 | ||
151 | static void free_watch(XenWatch *watch) | |
152 | { | |
153 | g_free(watch->token); | |
154 | g_free(watch->key); | |
155 | g_free(watch->node); | |
156 | ||
157 | g_free(watch); | |
158 | } | |
159 | ||
374752a2 PD |
160 | struct XenWatchList { |
161 | struct xs_handle *xsh; | |
162 | NotifierList notifiers; | |
163 | }; | |
164 | ||
165 | static void watch_list_event(void *opaque) | |
166 | { | |
167 | XenWatchList *watch_list = opaque; | |
168 | char **v; | |
169 | const char *token; | |
170 | ||
171 | v = xs_check_watch(watch_list->xsh); | |
172 | if (!v) { | |
173 | return; | |
174 | } | |
175 | ||
176 | token = v[XS_WATCH_TOKEN]; | |
177 | ||
178 | notifier_list_notify(&watch_list->notifiers, (void *)token); | |
179 | ||
180 | free(v); | |
181 | } | |
182 | ||
183 | static XenWatchList *watch_list_create(struct xs_handle *xsh) | |
184 | { | |
185 | XenWatchList *watch_list = g_new0(XenWatchList, 1); | |
186 | ||
187 | g_assert(xsh); | |
188 | ||
189 | watch_list->xsh = xsh; | |
190 | notifier_list_init(&watch_list->notifiers); | |
191 | qemu_set_fd_handler(xs_fileno(watch_list->xsh), watch_list_event, NULL, | |
192 | watch_list); | |
193 | ||
194 | return watch_list; | |
195 | } | |
196 | ||
197 | static void watch_list_destroy(XenWatchList *watch_list) | |
198 | { | |
199 | g_assert(notifier_list_empty(&watch_list->notifiers)); | |
200 | qemu_set_fd_handler(xs_fileno(watch_list->xsh), NULL, NULL, NULL); | |
201 | g_free(watch_list); | |
202 | } | |
203 | ||
204 | static XenWatch *watch_list_add(XenWatchList *watch_list, const char *node, | |
205 | const char *key, XenWatchHandler handler, | |
206 | void *opaque, Error **errp) | |
82a29e30 PD |
207 | { |
208 | XenWatch *watch = new_watch(node, key, handler, opaque); | |
209 | Error *local_err = NULL; | |
210 | ||
374752a2 | 211 | notifier_list_add(&watch_list->notifiers, &watch->notifier); |
82a29e30 | 212 | |
374752a2 | 213 | xs_node_watch(watch_list->xsh, node, key, watch->token, &local_err); |
82a29e30 PD |
214 | if (local_err) { |
215 | error_propagate(errp, local_err); | |
216 | ||
217 | notifier_remove(&watch->notifier); | |
218 | free_watch(watch); | |
219 | ||
220 | return NULL; | |
221 | } | |
222 | ||
223 | return watch; | |
224 | } | |
225 | ||
374752a2 PD |
226 | static void watch_list_remove(XenWatchList *watch_list, XenWatch *watch, |
227 | Error **errp) | |
82a29e30 | 228 | { |
374752a2 | 229 | xs_node_unwatch(watch_list->xsh, watch->node, watch->key, watch->token, |
82a29e30 PD |
230 | errp); |
231 | ||
232 | notifier_remove(&watch->notifier); | |
233 | free_watch(watch); | |
234 | } | |
235 | ||
374752a2 PD |
236 | static XenWatch *xen_bus_add_watch(XenBus *xenbus, const char *node, |
237 | const char *key, XenWatchHandler handler, | |
d198b711 | 238 | Error **errp) |
374752a2 PD |
239 | { |
240 | trace_xen_bus_add_watch(node, key); | |
241 | ||
d198b711 | 242 | return watch_list_add(xenbus->watch_list, node, key, handler, xenbus, |
374752a2 PD |
243 | errp); |
244 | } | |
245 | ||
246 | static void xen_bus_remove_watch(XenBus *xenbus, XenWatch *watch, | |
247 | Error **errp) | |
248 | { | |
249 | trace_xen_bus_remove_watch(watch->node, watch->key); | |
250 | ||
251 | watch_list_remove(xenbus->watch_list, watch, errp); | |
252 | } | |
253 | ||
a783f8ad PD |
254 | static void xen_bus_backend_create(XenBus *xenbus, const char *type, |
255 | const char *name, char *path, | |
256 | Error **errp) | |
257 | { | |
258 | xs_transaction_t tid; | |
259 | char **key; | |
260 | QDict *opts; | |
261 | unsigned int i, n; | |
262 | Error *local_err = NULL; | |
263 | ||
264 | trace_xen_bus_backend_create(type, path); | |
265 | ||
266 | again: | |
267 | tid = xs_transaction_start(xenbus->xsh); | |
268 | if (tid == XBT_NULL) { | |
269 | error_setg(errp, "failed xs_transaction_start"); | |
270 | return; | |
271 | } | |
272 | ||
273 | key = xs_directory(xenbus->xsh, tid, path, &n); | |
274 | if (!key) { | |
275 | if (!xs_transaction_end(xenbus->xsh, tid, true)) { | |
276 | error_setg_errno(errp, errno, "failed xs_transaction_end"); | |
277 | } | |
278 | return; | |
279 | } | |
280 | ||
281 | opts = qdict_new(); | |
282 | for (i = 0; i < n; i++) { | |
283 | char *val; | |
284 | ||
285 | /* | |
286 | * Assume anything found in the xenstore backend area, other than | |
287 | * the keys created for a generic XenDevice, are parameters | |
288 | * to be used to configure the backend. | |
289 | */ | |
290 | if (!strcmp(key[i], "state") || | |
291 | !strcmp(key[i], "online") || | |
292 | !strcmp(key[i], "frontend") || | |
293 | !strcmp(key[i], "frontend-id") || | |
294 | !strcmp(key[i], "hotplug-status")) | |
295 | continue; | |
296 | ||
297 | if (xs_node_scanf(xenbus->xsh, tid, path, key[i], NULL, "%ms", | |
298 | &val) == 1) { | |
299 | qdict_put_str(opts, key[i], val); | |
300 | free(val); | |
301 | } | |
302 | } | |
303 | ||
304 | free(key); | |
305 | ||
306 | if (!xs_transaction_end(xenbus->xsh, tid, false)) { | |
307 | qobject_unref(opts); | |
308 | ||
309 | if (errno == EAGAIN) { | |
310 | goto again; | |
311 | } | |
312 | ||
313 | error_setg_errno(errp, errno, "failed xs_transaction_end"); | |
314 | return; | |
315 | } | |
316 | ||
317 | xen_backend_device_create(xenbus, type, name, opts, &local_err); | |
318 | qobject_unref(opts); | |
319 | ||
320 | if (local_err) { | |
321 | error_propagate_prepend(errp, local_err, | |
322 | "failed to create '%s' device '%s': ", | |
323 | type, name); | |
324 | } | |
325 | } | |
326 | ||
327 | static void xen_bus_type_enumerate(XenBus *xenbus, const char *type) | |
328 | { | |
329 | char *domain_path = g_strdup_printf("backend/%s/%u", type, xen_domid); | |
330 | char **backend; | |
331 | unsigned int i, n; | |
332 | ||
333 | trace_xen_bus_type_enumerate(type); | |
334 | ||
335 | backend = xs_directory(xenbus->xsh, XBT_NULL, domain_path, &n); | |
336 | if (!backend) { | |
337 | goto out; | |
338 | } | |
339 | ||
340 | for (i = 0; i < n; i++) { | |
341 | char *backend_path = g_strdup_printf("%s/%s", domain_path, | |
342 | backend[i]); | |
3809f758 PD |
343 | enum xenbus_state state; |
344 | unsigned int online; | |
a783f8ad PD |
345 | |
346 | if (xs_node_scanf(xenbus->xsh, XBT_NULL, backend_path, "state", | |
3809f758 PD |
347 | NULL, "%u", &state) != 1) |
348 | state = XenbusStateUnknown; | |
a783f8ad | 349 | |
3809f758 PD |
350 | if (xs_node_scanf(xenbus->xsh, XBT_NULL, backend_path, "online", |
351 | NULL, "%u", &online) != 1) | |
352 | online = 0; | |
353 | ||
354 | if (online && state == XenbusStateInitialising) { | |
a783f8ad PD |
355 | Error *local_err = NULL; |
356 | ||
357 | xen_bus_backend_create(xenbus, type, backend[i], backend_path, | |
358 | &local_err); | |
359 | if (local_err) { | |
360 | error_report_err(local_err); | |
361 | } | |
362 | } | |
363 | ||
364 | g_free(backend_path); | |
365 | } | |
366 | ||
367 | free(backend); | |
368 | ||
369 | out: | |
370 | g_free(domain_path); | |
371 | } | |
372 | ||
3809f758 | 373 | static void xen_bus_enumerate(XenBus *xenbus) |
a783f8ad | 374 | { |
a783f8ad PD |
375 | char **type; |
376 | unsigned int i, n; | |
377 | ||
378 | trace_xen_bus_enumerate(); | |
379 | ||
380 | type = xs_directory(xenbus->xsh, XBT_NULL, "backend", &n); | |
381 | if (!type) { | |
382 | return; | |
383 | } | |
384 | ||
385 | for (i = 0; i < n; i++) { | |
386 | xen_bus_type_enumerate(xenbus, type[i]); | |
387 | } | |
388 | ||
389 | free(type); | |
390 | } | |
391 | ||
3809f758 PD |
392 | static void xen_bus_device_cleanup(XenDevice *xendev) |
393 | { | |
394 | const char *type = object_get_typename(OBJECT(xendev)); | |
395 | Error *local_err = NULL; | |
396 | ||
397 | trace_xen_bus_device_cleanup(type, xendev->name); | |
398 | ||
399 | g_assert(!xendev->backend_online); | |
400 | ||
401 | if (!xen_backend_try_device_destroy(xendev, &local_err)) { | |
402 | object_unparent(OBJECT(xendev)); | |
403 | } | |
404 | ||
405 | if (local_err) { | |
406 | error_report_err(local_err); | |
407 | } | |
408 | } | |
409 | ||
410 | static void xen_bus_cleanup(XenBus *xenbus) | |
411 | { | |
412 | XenDevice *xendev, *next; | |
413 | ||
414 | trace_xen_bus_cleanup(); | |
415 | ||
416 | QLIST_FOREACH_SAFE(xendev, &xenbus->inactive_devices, list, next) { | |
417 | g_assert(xendev->inactive); | |
418 | QLIST_REMOVE(xendev, list); | |
419 | xen_bus_device_cleanup(xendev); | |
420 | } | |
421 | } | |
422 | ||
423 | static void xen_bus_backend_changed(void *opaque) | |
424 | { | |
425 | XenBus *xenbus = opaque; | |
426 | ||
427 | xen_bus_enumerate(xenbus); | |
428 | xen_bus_cleanup(xenbus); | |
429 | } | |
430 | ||
b69c3c21 | 431 | static void xen_bus_unrealize(BusState *bus) |
108f7bba | 432 | { |
094a2239 PD |
433 | XenBus *xenbus = XEN_BUS(bus); |
434 | ||
108f7bba | 435 | trace_xen_bus_unrealize(); |
094a2239 | 436 | |
a783f8ad PD |
437 | if (xenbus->backend_watch) { |
438 | xen_bus_remove_watch(xenbus, xenbus->backend_watch, NULL); | |
439 | xenbus->backend_watch = NULL; | |
440 | } | |
441 | ||
374752a2 PD |
442 | if (xenbus->watch_list) { |
443 | watch_list_destroy(xenbus->watch_list); | |
444 | xenbus->watch_list = NULL; | |
094a2239 PD |
445 | } |
446 | ||
374752a2 PD |
447 | if (xenbus->xsh) { |
448 | xs_close(xenbus->xsh); | |
82a29e30 | 449 | } |
82a29e30 PD |
450 | } |
451 | ||
108f7bba PD |
452 | static void xen_bus_realize(BusState *bus, Error **errp) |
453 | { | |
094a2239 PD |
454 | XenBus *xenbus = XEN_BUS(bus); |
455 | unsigned int domid; | |
a783f8ad | 456 | Error *local_err = NULL; |
094a2239 | 457 | |
108f7bba | 458 | trace_xen_bus_realize(); |
094a2239 PD |
459 | |
460 | xenbus->xsh = xs_open(0); | |
461 | if (!xenbus->xsh) { | |
462 | error_setg_errno(errp, errno, "failed xs_open"); | |
463 | goto fail; | |
464 | } | |
465 | ||
466 | if (xs_node_scanf(xenbus->xsh, XBT_NULL, "", /* domain root node */ | |
467 | "domid", NULL, "%u", &domid) == 1) { | |
468 | xenbus->backend_id = domid; | |
469 | } else { | |
470 | xenbus->backend_id = 0; /* Assume lack of node means dom0 */ | |
471 | } | |
472 | ||
374752a2 | 473 | xenbus->watch_list = watch_list_create(xenbus->xsh); |
a783f8ad PD |
474 | |
475 | module_call_init(MODULE_INIT_XEN_BACKEND); | |
476 | ||
477 | xenbus->backend_watch = | |
478 | xen_bus_add_watch(xenbus, "", /* domain root node */ | |
3809f758 | 479 | "backend", xen_bus_backend_changed, &local_err); |
a783f8ad PD |
480 | if (local_err) { |
481 | /* This need not be treated as a hard error so don't propagate */ | |
482 | error_reportf_err(local_err, | |
483 | "failed to set up enumeration watch: "); | |
484 | } | |
485 | ||
094a2239 PD |
486 | return; |
487 | ||
488 | fail: | |
b69c3c21 | 489 | xen_bus_unrealize(bus); |
108f7bba PD |
490 | } |
491 | ||
b6af8926 PD |
492 | static void xen_bus_unplug_request(HotplugHandler *hotplug, |
493 | DeviceState *dev, | |
494 | Error **errp) | |
495 | { | |
496 | XenDevice *xendev = XEN_DEVICE(dev); | |
497 | ||
498 | xen_device_unplug(xendev, errp); | |
499 | } | |
500 | ||
108f7bba PD |
501 | static void xen_bus_class_init(ObjectClass *class, void *data) |
502 | { | |
503 | BusClass *bus_class = BUS_CLASS(class); | |
b6af8926 | 504 | HotplugHandlerClass *hotplug_class = HOTPLUG_HANDLER_CLASS(class); |
108f7bba | 505 | |
094a2239 PD |
506 | bus_class->print_dev = xen_bus_print_dev; |
507 | bus_class->get_dev_path = xen_bus_get_dev_path; | |
108f7bba PD |
508 | bus_class->realize = xen_bus_realize; |
509 | bus_class->unrealize = xen_bus_unrealize; | |
b6af8926 PD |
510 | |
511 | hotplug_class->unplug_request = xen_bus_unplug_request; | |
108f7bba PD |
512 | } |
513 | ||
514 | static const TypeInfo xen_bus_type_info = { | |
515 | .name = TYPE_XEN_BUS, | |
516 | .parent = TYPE_BUS, | |
517 | .instance_size = sizeof(XenBus), | |
518 | .class_size = sizeof(XenBusClass), | |
519 | .class_init = xen_bus_class_init, | |
520 | .interfaces = (InterfaceInfo[]) { | |
521 | { TYPE_HOTPLUG_HANDLER }, | |
522 | { } | |
523 | }, | |
524 | }; | |
525 | ||
b6af8926 PD |
526 | void xen_device_backend_printf(XenDevice *xendev, const char *key, |
527 | const char *fmt, ...) | |
094a2239 PD |
528 | { |
529 | XenBus *xenbus = XEN_BUS(qdev_get_parent_bus(DEVICE(xendev))); | |
530 | Error *local_err = NULL; | |
531 | va_list ap; | |
532 | ||
533 | g_assert(xenbus->xsh); | |
534 | ||
535 | va_start(ap, fmt); | |
536 | xs_node_vprintf(xenbus->xsh, XBT_NULL, xendev->backend_path, key, | |
537 | &local_err, fmt, ap); | |
538 | va_end(ap); | |
539 | ||
540 | if (local_err) { | |
541 | error_report_err(local_err); | |
542 | } | |
543 | } | |
544 | ||
82a29e30 PD |
545 | static int xen_device_backend_scanf(XenDevice *xendev, const char *key, |
546 | const char *fmt, ...) | |
547 | { | |
548 | XenBus *xenbus = XEN_BUS(qdev_get_parent_bus(DEVICE(xendev))); | |
549 | va_list ap; | |
550 | int rc; | |
551 | ||
552 | g_assert(xenbus->xsh); | |
553 | ||
554 | va_start(ap, fmt); | |
555 | rc = xs_node_vscanf(xenbus->xsh, XBT_NULL, xendev->backend_path, key, | |
556 | NULL, fmt, ap); | |
557 | va_end(ap); | |
558 | ||
559 | return rc; | |
560 | } | |
561 | ||
562 | void xen_device_backend_set_state(XenDevice *xendev, | |
563 | enum xenbus_state state) | |
094a2239 PD |
564 | { |
565 | const char *type = object_get_typename(OBJECT(xendev)); | |
566 | ||
567 | if (xendev->backend_state == state) { | |
568 | return; | |
569 | } | |
570 | ||
571 | trace_xen_device_backend_state(type, xendev->name, | |
572 | xs_strstate(state)); | |
573 | ||
574 | xendev->backend_state = state; | |
575 | xen_device_backend_printf(xendev, "state", "%u", state); | |
576 | } | |
577 | ||
82a29e30 PD |
578 | enum xenbus_state xen_device_backend_get_state(XenDevice *xendev) |
579 | { | |
580 | return xendev->backend_state; | |
581 | } | |
582 | ||
b6af8926 PD |
583 | static void xen_device_backend_set_online(XenDevice *xendev, bool online) |
584 | { | |
585 | const char *type = object_get_typename(OBJECT(xendev)); | |
586 | ||
587 | if (xendev->backend_online == online) { | |
588 | return; | |
589 | } | |
590 | ||
591 | trace_xen_device_backend_online(type, xendev->name, online); | |
592 | ||
593 | xendev->backend_online = online; | |
594 | xen_device_backend_printf(xendev, "online", "%u", online); | |
595 | } | |
596 | ||
cb323146 AP |
597 | /* |
598 | * Tell from the state whether the frontend is likely alive, | |
599 | * i.e. it will react to a change of state of the backend. | |
600 | */ | |
3809f758 | 601 | static bool xen_device_frontend_is_active(XenDevice *xendev) |
cb323146 | 602 | { |
3809f758 | 603 | switch (xendev->frontend_state) { |
cb323146 AP |
604 | case XenbusStateInitWait: |
605 | case XenbusStateInitialised: | |
606 | case XenbusStateConnected: | |
607 | case XenbusStateClosing: | |
608 | return true; | |
609 | default: | |
610 | return false; | |
611 | } | |
612 | } | |
613 | ||
b6af8926 PD |
614 | static void xen_device_backend_changed(void *opaque) |
615 | { | |
616 | XenDevice *xendev = opaque; | |
617 | const char *type = object_get_typename(OBJECT(xendev)); | |
618 | enum xenbus_state state; | |
619 | unsigned int online; | |
620 | ||
621 | trace_xen_device_backend_changed(type, xendev->name); | |
622 | ||
623 | if (xen_device_backend_scanf(xendev, "state", "%u", &state) != 1) { | |
624 | state = XenbusStateUnknown; | |
625 | } | |
626 | ||
627 | xen_device_backend_set_state(xendev, state); | |
628 | ||
629 | if (xen_device_backend_scanf(xendev, "online", "%u", &online) != 1) { | |
630 | online = 0; | |
631 | } | |
632 | ||
633 | xen_device_backend_set_online(xendev, !!online); | |
634 | ||
635 | /* | |
636 | * If the toolstack (or unplug request callback) has set the backend | |
cb323146 AP |
637 | * state to Closing, but there is no active frontend then set the |
638 | * backend state to Closed. | |
b6af8926 | 639 | */ |
3809f758 PD |
640 | if (state == XenbusStateClosing && |
641 | !xen_device_frontend_is_active(xendev)) { | |
b6af8926 PD |
642 | xen_device_backend_set_state(xendev, XenbusStateClosed); |
643 | } | |
644 | ||
645 | /* | |
67bc8e00 | 646 | * If a backend is still 'online' then we should leave it alone but, |
3809f758 PD |
647 | * if a backend is not 'online', then the device is a candidate |
648 | * for destruction. Hence add it to the 'inactive' list to be cleaned | |
649 | * by xen_bus_cleanup(). | |
b6af8926 | 650 | */ |
3809f758 PD |
651 | if (!online && |
652 | (state == XenbusStateClosed || state == XenbusStateInitialising || | |
653 | state == XenbusStateInitWait || state == XenbusStateUnknown) && | |
654 | !xendev->inactive) { | |
655 | XenBus *xenbus = XEN_BUS(qdev_get_parent_bus(DEVICE(xendev))); | |
a783f8ad | 656 | |
3809f758 PD |
657 | xendev->inactive = true; |
658 | QLIST_INSERT_HEAD(&xenbus->inactive_devices, xendev, list); | |
659 | ||
660 | /* | |
661 | * Re-write the state to cause a XenBus backend_watch notification, | |
662 | * resulting in a call to xen_bus_cleanup(). | |
663 | */ | |
664 | xen_device_backend_printf(xendev, "state", "%u", state); | |
b6af8926 PD |
665 | } |
666 | } | |
667 | ||
d198b711 PD |
668 | static XenWatch *xen_device_add_watch(XenDevice *xendev, const char *node, |
669 | const char *key, | |
670 | XenWatchHandler handler, | |
671 | Error **errp) | |
672 | { | |
673 | const char *type = object_get_typename(OBJECT(xendev)); | |
674 | ||
675 | trace_xen_device_add_watch(type, xendev->name, node, key); | |
676 | ||
677 | return watch_list_add(xendev->watch_list, node, key, handler, xendev, | |
678 | errp); | |
679 | } | |
680 | ||
681 | static void xen_device_remove_watch(XenDevice *xendev, XenWatch *watch, | |
682 | Error **errp) | |
683 | { | |
684 | const char *type = object_get_typename(OBJECT(xendev)); | |
685 | ||
686 | trace_xen_device_remove_watch(type, xendev->name, watch->node, | |
687 | watch->key); | |
688 | ||
689 | watch_list_remove(xendev->watch_list, watch, errp); | |
690 | } | |
691 | ||
692 | ||
094a2239 PD |
693 | static void xen_device_backend_create(XenDevice *xendev, Error **errp) |
694 | { | |
695 | XenBus *xenbus = XEN_BUS(qdev_get_parent_bus(DEVICE(xendev))); | |
696 | struct xs_permissions perms[2]; | |
697 | Error *local_err = NULL; | |
698 | ||
699 | xendev->backend_path = xen_device_get_backend_path(xendev); | |
700 | ||
701 | perms[0].id = xenbus->backend_id; | |
702 | perms[0].perms = XS_PERM_NONE; | |
703 | perms[1].id = xendev->frontend_id; | |
704 | perms[1].perms = XS_PERM_READ; | |
705 | ||
706 | g_assert(xenbus->xsh); | |
707 | ||
708 | xs_node_create(xenbus->xsh, XBT_NULL, xendev->backend_path, perms, | |
709 | ARRAY_SIZE(perms), &local_err); | |
710 | if (local_err) { | |
711 | error_propagate_prepend(errp, local_err, | |
712 | "failed to create backend: "); | |
b6af8926 PD |
713 | return; |
714 | } | |
715 | ||
716 | xendev->backend_state_watch = | |
d198b711 PD |
717 | xen_device_add_watch(xendev, xendev->backend_path, |
718 | "state", xen_device_backend_changed, | |
719 | &local_err); | |
b6af8926 PD |
720 | if (local_err) { |
721 | error_propagate_prepend(errp, local_err, | |
722 | "failed to watch backend state: "); | |
723 | return; | |
724 | } | |
725 | ||
726 | xendev->backend_online_watch = | |
d198b711 PD |
727 | xen_device_add_watch(xendev, xendev->backend_path, |
728 | "online", xen_device_backend_changed, | |
729 | &local_err); | |
b6af8926 PD |
730 | if (local_err) { |
731 | error_propagate_prepend(errp, local_err, | |
732 | "failed to watch backend online: "); | |
733 | return; | |
094a2239 PD |
734 | } |
735 | } | |
736 | ||
737 | static void xen_device_backend_destroy(XenDevice *xendev) | |
738 | { | |
739 | XenBus *xenbus = XEN_BUS(qdev_get_parent_bus(DEVICE(xendev))); | |
740 | Error *local_err = NULL; | |
741 | ||
b6af8926 | 742 | if (xendev->backend_online_watch) { |
d198b711 | 743 | xen_device_remove_watch(xendev, xendev->backend_online_watch, NULL); |
b6af8926 PD |
744 | xendev->backend_online_watch = NULL; |
745 | } | |
746 | ||
747 | if (xendev->backend_state_watch) { | |
d198b711 | 748 | xen_device_remove_watch(xendev, xendev->backend_state_watch, NULL); |
b6af8926 PD |
749 | xendev->backend_state_watch = NULL; |
750 | } | |
751 | ||
094a2239 PD |
752 | if (!xendev->backend_path) { |
753 | return; | |
754 | } | |
755 | ||
756 | g_assert(xenbus->xsh); | |
757 | ||
758 | xs_node_destroy(xenbus->xsh, XBT_NULL, xendev->backend_path, | |
759 | &local_err); | |
760 | g_free(xendev->backend_path); | |
761 | xendev->backend_path = NULL; | |
762 | ||
763 | if (local_err) { | |
764 | error_report_err(local_err); | |
765 | } | |
766 | } | |
767 | ||
b6af8926 PD |
768 | void xen_device_frontend_printf(XenDevice *xendev, const char *key, |
769 | const char *fmt, ...) | |
094a2239 PD |
770 | { |
771 | XenBus *xenbus = XEN_BUS(qdev_get_parent_bus(DEVICE(xendev))); | |
772 | Error *local_err = NULL; | |
773 | va_list ap; | |
774 | ||
775 | g_assert(xenbus->xsh); | |
776 | ||
777 | va_start(ap, fmt); | |
778 | xs_node_vprintf(xenbus->xsh, XBT_NULL, xendev->frontend_path, key, | |
779 | &local_err, fmt, ap); | |
780 | va_end(ap); | |
781 | ||
782 | if (local_err) { | |
783 | error_report_err(local_err); | |
784 | } | |
785 | } | |
786 | ||
b6af8926 PD |
787 | int xen_device_frontend_scanf(XenDevice *xendev, const char *key, |
788 | const char *fmt, ...) | |
82a29e30 PD |
789 | { |
790 | XenBus *xenbus = XEN_BUS(qdev_get_parent_bus(DEVICE(xendev))); | |
791 | va_list ap; | |
792 | int rc; | |
793 | ||
794 | g_assert(xenbus->xsh); | |
795 | ||
796 | va_start(ap, fmt); | |
797 | rc = xs_node_vscanf(xenbus->xsh, XBT_NULL, xendev->frontend_path, key, | |
798 | NULL, fmt, ap); | |
799 | va_end(ap); | |
800 | ||
801 | return rc; | |
802 | } | |
803 | ||
094a2239 | 804 | static void xen_device_frontend_set_state(XenDevice *xendev, |
705be570 AP |
805 | enum xenbus_state state, |
806 | bool publish) | |
094a2239 PD |
807 | { |
808 | const char *type = object_get_typename(OBJECT(xendev)); | |
809 | ||
810 | if (xendev->frontend_state == state) { | |
811 | return; | |
812 | } | |
813 | ||
814 | trace_xen_device_frontend_state(type, xendev->name, | |
815 | xs_strstate(state)); | |
816 | ||
817 | xendev->frontend_state = state; | |
705be570 AP |
818 | if (publish) { |
819 | xen_device_frontend_printf(xendev, "state", "%u", state); | |
820 | } | |
094a2239 PD |
821 | } |
822 | ||
82a29e30 PD |
823 | static void xen_device_frontend_changed(void *opaque) |
824 | { | |
825 | XenDevice *xendev = opaque; | |
826 | XenDeviceClass *xendev_class = XEN_DEVICE_GET_CLASS(xendev); | |
827 | const char *type = object_get_typename(OBJECT(xendev)); | |
828 | enum xenbus_state state; | |
829 | ||
830 | trace_xen_device_frontend_changed(type, xendev->name); | |
831 | ||
832 | if (xen_device_frontend_scanf(xendev, "state", "%u", &state) != 1) { | |
833 | state = XenbusStateUnknown; | |
834 | } | |
835 | ||
705be570 | 836 | xen_device_frontend_set_state(xendev, state, false); |
82a29e30 | 837 | |
67bc8e00 PD |
838 | if (state == XenbusStateInitialising && |
839 | xendev->backend_state == XenbusStateClosed && | |
840 | xendev->backend_online) { | |
841 | /* | |
842 | * The frontend is re-initializing so switch back to | |
843 | * InitWait. | |
844 | */ | |
845 | xen_device_backend_set_state(xendev, XenbusStateInitWait); | |
846 | return; | |
847 | } | |
848 | ||
82a29e30 PD |
849 | if (xendev_class->frontend_changed) { |
850 | Error *local_err = NULL; | |
851 | ||
852 | xendev_class->frontend_changed(xendev, state, &local_err); | |
853 | ||
854 | if (local_err) { | |
855 | error_reportf_err(local_err, "frontend change error: "); | |
856 | } | |
857 | } | |
82a29e30 PD |
858 | } |
859 | ||
6bd6b955 MS |
860 | static bool xen_device_frontend_exists(XenDevice *xendev) |
861 | { | |
862 | enum xenbus_state state; | |
863 | ||
864 | return (xen_device_frontend_scanf(xendev, "state", "%u", &state) == 1); | |
865 | } | |
866 | ||
094a2239 PD |
867 | static void xen_device_frontend_create(XenDevice *xendev, Error **errp) |
868 | { | |
869 | XenBus *xenbus = XEN_BUS(qdev_get_parent_bus(DEVICE(xendev))); | |
870 | struct xs_permissions perms[2]; | |
871 | Error *local_err = NULL; | |
872 | ||
873 | xendev->frontend_path = xen_device_get_frontend_path(xendev); | |
874 | ||
6bd6b955 MS |
875 | /* |
876 | * The frontend area may have already been created by a legacy | |
877 | * toolstack. | |
878 | */ | |
879 | if (!xen_device_frontend_exists(xendev)) { | |
880 | perms[0].id = xendev->frontend_id; | |
881 | perms[0].perms = XS_PERM_NONE; | |
882 | perms[1].id = xenbus->backend_id; | |
883 | perms[1].perms = XS_PERM_READ | XS_PERM_WRITE; | |
094a2239 | 884 | |
6bd6b955 | 885 | g_assert(xenbus->xsh); |
094a2239 | 886 | |
6bd6b955 MS |
887 | xs_node_create(xenbus->xsh, XBT_NULL, xendev->frontend_path, perms, |
888 | ARRAY_SIZE(perms), &local_err); | |
889 | if (local_err) { | |
890 | error_propagate_prepend(errp, local_err, | |
891 | "failed to create frontend: "); | |
892 | return; | |
893 | } | |
82a29e30 PD |
894 | } |
895 | ||
896 | xendev->frontend_state_watch = | |
d198b711 PD |
897 | xen_device_add_watch(xendev, xendev->frontend_path, "state", |
898 | xen_device_frontend_changed, &local_err); | |
82a29e30 PD |
899 | if (local_err) { |
900 | error_propagate_prepend(errp, local_err, | |
901 | "failed to watch frontend state: "); | |
094a2239 PD |
902 | } |
903 | } | |
904 | ||
905 | static void xen_device_frontend_destroy(XenDevice *xendev) | |
906 | { | |
907 | XenBus *xenbus = XEN_BUS(qdev_get_parent_bus(DEVICE(xendev))); | |
908 | Error *local_err = NULL; | |
909 | ||
82a29e30 | 910 | if (xendev->frontend_state_watch) { |
d198b711 PD |
911 | xen_device_remove_watch(xendev, xendev->frontend_state_watch, |
912 | NULL); | |
82a29e30 PD |
913 | xendev->frontend_state_watch = NULL; |
914 | } | |
915 | ||
094a2239 PD |
916 | if (!xendev->frontend_path) { |
917 | return; | |
918 | } | |
919 | ||
920 | g_assert(xenbus->xsh); | |
921 | ||
922 | xs_node_destroy(xenbus->xsh, XBT_NULL, xendev->frontend_path, | |
923 | &local_err); | |
924 | g_free(xendev->frontend_path); | |
925 | xendev->frontend_path = NULL; | |
926 | ||
927 | if (local_err) { | |
928 | error_report_err(local_err); | |
929 | } | |
930 | } | |
931 | ||
4b34b5b1 PD |
932 | void xen_device_set_max_grant_refs(XenDevice *xendev, unsigned int nr_refs, |
933 | Error **errp) | |
934 | { | |
935 | if (xengnttab_set_max_grants(xendev->xgth, nr_refs)) { | |
936 | error_setg_errno(errp, errno, "xengnttab_set_max_grants failed"); | |
937 | } | |
938 | } | |
939 | ||
940 | void *xen_device_map_grant_refs(XenDevice *xendev, uint32_t *refs, | |
941 | unsigned int nr_refs, int prot, | |
942 | Error **errp) | |
943 | { | |
944 | void *map = xengnttab_map_domain_grant_refs(xendev->xgth, nr_refs, | |
945 | xendev->frontend_id, refs, | |
946 | prot); | |
947 | ||
948 | if (!map) { | |
949 | error_setg_errno(errp, errno, | |
950 | "xengnttab_map_domain_grant_refs failed"); | |
951 | } | |
952 | ||
953 | return map; | |
954 | } | |
955 | ||
956 | void xen_device_unmap_grant_refs(XenDevice *xendev, void *map, | |
957 | unsigned int nr_refs, Error **errp) | |
958 | { | |
959 | if (xengnttab_unmap(xendev->xgth, map, nr_refs)) { | |
960 | error_setg_errno(errp, errno, "xengnttab_unmap failed"); | |
961 | } | |
962 | } | |
963 | ||
964 | static void compat_copy_grant_refs(XenDevice *xendev, bool to_domain, | |
965 | XenDeviceGrantCopySegment segs[], | |
966 | unsigned int nr_segs, Error **errp) | |
967 | { | |
968 | uint32_t *refs = g_new(uint32_t, nr_segs); | |
969 | int prot = to_domain ? PROT_WRITE : PROT_READ; | |
970 | void *map; | |
971 | unsigned int i; | |
972 | ||
973 | for (i = 0; i < nr_segs; i++) { | |
974 | XenDeviceGrantCopySegment *seg = &segs[i]; | |
975 | ||
976 | refs[i] = to_domain ? seg->dest.foreign.ref : | |
977 | seg->source.foreign.ref; | |
978 | } | |
979 | ||
980 | map = xengnttab_map_domain_grant_refs(xendev->xgth, nr_segs, | |
981 | xendev->frontend_id, refs, | |
982 | prot); | |
983 | if (!map) { | |
984 | error_setg_errno(errp, errno, | |
985 | "xengnttab_map_domain_grant_refs failed"); | |
986 | goto done; | |
987 | } | |
988 | ||
989 | for (i = 0; i < nr_segs; i++) { | |
990 | XenDeviceGrantCopySegment *seg = &segs[i]; | |
991 | void *page = map + (i * XC_PAGE_SIZE); | |
992 | ||
993 | if (to_domain) { | |
994 | memcpy(page + seg->dest.foreign.offset, seg->source.virt, | |
995 | seg->len); | |
996 | } else { | |
997 | memcpy(seg->dest.virt, page + seg->source.foreign.offset, | |
998 | seg->len); | |
999 | } | |
1000 | } | |
1001 | ||
1002 | if (xengnttab_unmap(xendev->xgth, map, nr_segs)) { | |
1003 | error_setg_errno(errp, errno, "xengnttab_unmap failed"); | |
1004 | } | |
1005 | ||
1006 | done: | |
1007 | g_free(refs); | |
1008 | } | |
1009 | ||
1010 | void xen_device_copy_grant_refs(XenDevice *xendev, bool to_domain, | |
1011 | XenDeviceGrantCopySegment segs[], | |
1012 | unsigned int nr_segs, Error **errp) | |
1013 | { | |
1014 | xengnttab_grant_copy_segment_t *xengnttab_segs; | |
1015 | unsigned int i; | |
1016 | ||
1017 | if (!xendev->feature_grant_copy) { | |
1018 | compat_copy_grant_refs(xendev, to_domain, segs, nr_segs, errp); | |
1019 | return; | |
1020 | } | |
1021 | ||
1022 | xengnttab_segs = g_new0(xengnttab_grant_copy_segment_t, nr_segs); | |
1023 | ||
1024 | for (i = 0; i < nr_segs; i++) { | |
1025 | XenDeviceGrantCopySegment *seg = &segs[i]; | |
1026 | xengnttab_grant_copy_segment_t *xengnttab_seg = &xengnttab_segs[i]; | |
1027 | ||
1028 | if (to_domain) { | |
1029 | xengnttab_seg->flags = GNTCOPY_dest_gref; | |
1030 | xengnttab_seg->dest.foreign.domid = xendev->frontend_id; | |
1031 | xengnttab_seg->dest.foreign.ref = seg->dest.foreign.ref; | |
1032 | xengnttab_seg->dest.foreign.offset = seg->dest.foreign.offset; | |
1033 | xengnttab_seg->source.virt = seg->source.virt; | |
1034 | } else { | |
1035 | xengnttab_seg->flags = GNTCOPY_source_gref; | |
1036 | xengnttab_seg->source.foreign.domid = xendev->frontend_id; | |
1037 | xengnttab_seg->source.foreign.ref = seg->source.foreign.ref; | |
1038 | xengnttab_seg->source.foreign.offset = | |
1039 | seg->source.foreign.offset; | |
1040 | xengnttab_seg->dest.virt = seg->dest.virt; | |
1041 | } | |
1042 | ||
1043 | xengnttab_seg->len = seg->len; | |
1044 | } | |
1045 | ||
1046 | if (xengnttab_grant_copy(xendev->xgth, nr_segs, xengnttab_segs)) { | |
1047 | error_setg_errno(errp, errno, "xengnttab_grant_copy failed"); | |
1048 | goto done; | |
1049 | } | |
1050 | ||
1051 | for (i = 0; i < nr_segs; i++) { | |
1052 | xengnttab_grant_copy_segment_t *xengnttab_seg = &xengnttab_segs[i]; | |
1053 | ||
1054 | if (xengnttab_seg->status != GNTST_okay) { | |
1055 | error_setg(errp, "xengnttab_grant_copy seg[%u] failed", i); | |
1056 | break; | |
1057 | } | |
1058 | } | |
1059 | ||
1060 | done: | |
1061 | g_free(xengnttab_segs); | |
1062 | } | |
1063 | ||
a3d669c8 | 1064 | struct XenEventChannel { |
c0b336ea | 1065 | QLIST_ENTRY(XenEventChannel) list; |
83361a8a | 1066 | AioContext *ctx; |
c0b336ea | 1067 | xenevtchn_handle *xeh; |
a3d669c8 PD |
1068 | evtchn_port_t local_port; |
1069 | XenEventHandler handler; | |
1070 | void *opaque; | |
a3d669c8 PD |
1071 | }; |
1072 | ||
345f42b4 PD |
1073 | static bool xen_device_poll(void *opaque) |
1074 | { | |
1075 | XenEventChannel *channel = opaque; | |
1076 | ||
1077 | return channel->handler(channel->opaque); | |
1078 | } | |
1079 | ||
c0b336ea | 1080 | static void xen_device_event(void *opaque) |
a3d669c8 | 1081 | { |
c0b336ea PD |
1082 | XenEventChannel *channel = opaque; |
1083 | unsigned long port = xenevtchn_pending(channel->xeh); | |
a3d669c8 PD |
1084 | |
1085 | if (port == channel->local_port) { | |
345f42b4 | 1086 | xen_device_poll(channel); |
c0b336ea PD |
1087 | |
1088 | xenevtchn_unmask(channel->xeh, port); | |
a3d669c8 PD |
1089 | } |
1090 | } | |
1091 | ||
32d0b7be PD |
1092 | void xen_device_set_event_channel_context(XenDevice *xendev, |
1093 | XenEventChannel *channel, | |
1094 | AioContext *ctx, | |
1095 | Error **errp) | |
1096 | { | |
1097 | if (!channel) { | |
1098 | error_setg(errp, "bad channel"); | |
1099 | return; | |
1100 | } | |
1101 | ||
1102 | if (channel->ctx) | |
1103 | aio_set_fd_handler(channel->ctx, xenevtchn_fd(channel->xeh), true, | |
1104 | NULL, NULL, NULL, NULL); | |
1105 | ||
1106 | channel->ctx = ctx; | |
1107 | aio_set_fd_handler(channel->ctx, xenevtchn_fd(channel->xeh), true, | |
1108 | xen_device_event, NULL, xen_device_poll, channel); | |
1109 | } | |
1110 | ||
a3d669c8 PD |
1111 | XenEventChannel *xen_device_bind_event_channel(XenDevice *xendev, |
1112 | unsigned int port, | |
1113 | XenEventHandler handler, | |
1114 | void *opaque, Error **errp) | |
1115 | { | |
1116 | XenEventChannel *channel = g_new0(XenEventChannel, 1); | |
1117 | xenevtchn_port_or_error_t local_port; | |
1118 | ||
c0b336ea PD |
1119 | channel->xeh = xenevtchn_open(NULL, 0); |
1120 | if (!channel->xeh) { | |
1121 | error_setg_errno(errp, errno, "failed xenevtchn_open"); | |
1122 | goto fail; | |
1123 | } | |
1124 | ||
1125 | local_port = xenevtchn_bind_interdomain(channel->xeh, | |
a3d669c8 PD |
1126 | xendev->frontend_id, |
1127 | port); | |
1128 | if (local_port < 0) { | |
1129 | error_setg_errno(errp, errno, "xenevtchn_bind_interdomain failed"); | |
c0b336ea | 1130 | goto fail; |
a3d669c8 PD |
1131 | } |
1132 | ||
1133 | channel->local_port = local_port; | |
1134 | channel->handler = handler; | |
1135 | channel->opaque = opaque; | |
a3d669c8 | 1136 | |
32d0b7be PD |
1137 | /* Only reason for failure is a NULL channel */ |
1138 | xen_device_set_event_channel_context(xendev, channel, | |
1139 | qemu_get_aio_context(), | |
1140 | &error_abort); | |
c0b336ea PD |
1141 | |
1142 | QLIST_INSERT_HEAD(&xendev->event_channels, channel, list); | |
a3d669c8 PD |
1143 | |
1144 | return channel; | |
c0b336ea PD |
1145 | |
1146 | fail: | |
1147 | if (channel->xeh) { | |
1148 | xenevtchn_close(channel->xeh); | |
1149 | } | |
1150 | ||
1151 | g_free(channel); | |
1152 | ||
1153 | return NULL; | |
a3d669c8 PD |
1154 | } |
1155 | ||
1156 | void xen_device_notify_event_channel(XenDevice *xendev, | |
1157 | XenEventChannel *channel, | |
1158 | Error **errp) | |
1159 | { | |
1160 | if (!channel) { | |
1161 | error_setg(errp, "bad channel"); | |
1162 | return; | |
1163 | } | |
1164 | ||
c0b336ea | 1165 | if (xenevtchn_notify(channel->xeh, channel->local_port) < 0) { |
a3d669c8 PD |
1166 | error_setg_errno(errp, errno, "xenevtchn_notify failed"); |
1167 | } | |
1168 | } | |
1169 | ||
1170 | void xen_device_unbind_event_channel(XenDevice *xendev, | |
1171 | XenEventChannel *channel, | |
1172 | Error **errp) | |
1173 | { | |
1174 | if (!channel) { | |
1175 | error_setg(errp, "bad channel"); | |
1176 | return; | |
1177 | } | |
1178 | ||
c0b336ea | 1179 | QLIST_REMOVE(channel, list); |
a3d669c8 | 1180 | |
83361a8a PD |
1181 | aio_set_fd_handler(channel->ctx, xenevtchn_fd(channel->xeh), true, |
1182 | NULL, NULL, NULL, NULL); | |
c0b336ea PD |
1183 | |
1184 | if (xenevtchn_unbind(channel->xeh, channel->local_port) < 0) { | |
a3d669c8 PD |
1185 | error_setg_errno(errp, errno, "xenevtchn_unbind failed"); |
1186 | } | |
1187 | ||
c0b336ea | 1188 | xenevtchn_close(channel->xeh); |
a3d669c8 PD |
1189 | g_free(channel); |
1190 | } | |
1191 | ||
b69c3c21 | 1192 | static void xen_device_unrealize(DeviceState *dev) |
108f7bba PD |
1193 | { |
1194 | XenDevice *xendev = XEN_DEVICE(dev); | |
1195 | XenDeviceClass *xendev_class = XEN_DEVICE_GET_CLASS(xendev); | |
1196 | const char *type = object_get_typename(OBJECT(xendev)); | |
c0b336ea | 1197 | XenEventChannel *channel, *next; |
108f7bba | 1198 | |
094a2239 PD |
1199 | if (!xendev->name) { |
1200 | return; | |
1201 | } | |
1202 | ||
1203 | trace_xen_device_unrealize(type, xendev->name); | |
1204 | ||
1205 | if (xendev->exit.notify) { | |
1206 | qemu_remove_exit_notifier(&xendev->exit); | |
1207 | xendev->exit.notify = NULL; | |
1208 | } | |
108f7bba PD |
1209 | |
1210 | if (xendev_class->unrealize) { | |
b69c3c21 | 1211 | xendev_class->unrealize(xendev); |
108f7bba | 1212 | } |
094a2239 | 1213 | |
c0b336ea PD |
1214 | /* Make sure all event channels are cleaned up */ |
1215 | QLIST_FOREACH_SAFE(channel, &xendev->event_channels, list, next) { | |
1216 | xen_device_unbind_event_channel(xendev, channel, NULL); | |
1217 | } | |
1218 | ||
094a2239 PD |
1219 | xen_device_frontend_destroy(xendev); |
1220 | xen_device_backend_destroy(xendev); | |
1221 | ||
4b34b5b1 PD |
1222 | if (xendev->xgth) { |
1223 | xengnttab_close(xendev->xgth); | |
1224 | xendev->xgth = NULL; | |
1225 | } | |
1226 | ||
d198b711 PD |
1227 | if (xendev->watch_list) { |
1228 | watch_list_destroy(xendev->watch_list); | |
1229 | xendev->watch_list = NULL; | |
1230 | } | |
1231 | ||
1232 | if (xendev->xsh) { | |
1233 | xs_close(xendev->xsh); | |
1234 | xendev->xsh = NULL; | |
1235 | } | |
1236 | ||
094a2239 PD |
1237 | g_free(xendev->name); |
1238 | xendev->name = NULL; | |
1239 | } | |
1240 | ||
1241 | static void xen_device_exit(Notifier *n, void *data) | |
1242 | { | |
1243 | XenDevice *xendev = container_of(n, XenDevice, exit); | |
1244 | ||
b69c3c21 | 1245 | xen_device_unrealize(DEVICE(xendev)); |
108f7bba PD |
1246 | } |
1247 | ||
1248 | static void xen_device_realize(DeviceState *dev, Error **errp) | |
1249 | { | |
1250 | XenDevice *xendev = XEN_DEVICE(dev); | |
1251 | XenDeviceClass *xendev_class = XEN_DEVICE_GET_CLASS(xendev); | |
094a2239 | 1252 | XenBus *xenbus = XEN_BUS(qdev_get_parent_bus(DEVICE(xendev))); |
108f7bba PD |
1253 | const char *type = object_get_typename(OBJECT(xendev)); |
1254 | Error *local_err = NULL; | |
1255 | ||
094a2239 PD |
1256 | if (xendev->frontend_id == DOMID_INVALID) { |
1257 | xendev->frontend_id = xen_domid; | |
1258 | } | |
1259 | ||
1260 | if (xendev->frontend_id >= DOMID_FIRST_RESERVED) { | |
1261 | error_setg(errp, "invalid frontend-id"); | |
1262 | goto unrealize; | |
1263 | } | |
1264 | ||
1265 | if (!xendev_class->get_name) { | |
1266 | error_setg(errp, "get_name method not implemented"); | |
1267 | goto unrealize; | |
1268 | } | |
1269 | ||
1270 | xendev->name = xendev_class->get_name(xendev, &local_err); | |
1271 | if (local_err) { | |
1272 | error_propagate_prepend(errp, local_err, | |
1273 | "failed to get device name: "); | |
1274 | goto unrealize; | |
1275 | } | |
1276 | ||
1277 | trace_xen_device_realize(type, xendev->name); | |
1278 | ||
d198b711 PD |
1279 | xendev->xsh = xs_open(0); |
1280 | if (!xendev->xsh) { | |
1281 | error_setg_errno(errp, errno, "failed xs_open"); | |
1282 | goto unrealize; | |
1283 | } | |
1284 | ||
1285 | xendev->watch_list = watch_list_create(xendev->xsh); | |
1286 | ||
4b34b5b1 PD |
1287 | xendev->xgth = xengnttab_open(NULL, 0); |
1288 | if (!xendev->xgth) { | |
1289 | error_setg_errno(errp, errno, "failed xengnttab_open"); | |
1290 | goto unrealize; | |
1291 | } | |
1292 | ||
1293 | xendev->feature_grant_copy = | |
1294 | (xengnttab_grant_copy(xendev->xgth, 0, NULL) == 0); | |
1295 | ||
094a2239 PD |
1296 | xen_device_backend_create(xendev, &local_err); |
1297 | if (local_err) { | |
1298 | error_propagate(errp, local_err); | |
1299 | goto unrealize; | |
1300 | } | |
1301 | ||
1302 | xen_device_frontend_create(xendev, &local_err); | |
1303 | if (local_err) { | |
1304 | error_propagate(errp, local_err); | |
1305 | goto unrealize; | |
1306 | } | |
108f7bba PD |
1307 | |
1308 | if (xendev_class->realize) { | |
1309 | xendev_class->realize(xendev, &local_err); | |
1310 | if (local_err) { | |
1311 | error_propagate(errp, local_err); | |
1312 | goto unrealize; | |
1313 | } | |
1314 | } | |
1315 | ||
094a2239 PD |
1316 | xen_device_backend_printf(xendev, "frontend", "%s", |
1317 | xendev->frontend_path); | |
1318 | xen_device_backend_printf(xendev, "frontend-id", "%u", | |
1319 | xendev->frontend_id); | |
094a2239 PD |
1320 | xen_device_backend_printf(xendev, "hotplug-status", "connected"); |
1321 | ||
b6af8926 | 1322 | xen_device_backend_set_online(xendev, true); |
094a2239 PD |
1323 | xen_device_backend_set_state(xendev, XenbusStateInitWait); |
1324 | ||
6bd6b955 MS |
1325 | if (!xen_device_frontend_exists(xendev)) { |
1326 | xen_device_frontend_printf(xendev, "backend", "%s", | |
1327 | xendev->backend_path); | |
1328 | xen_device_frontend_printf(xendev, "backend-id", "%u", | |
1329 | xenbus->backend_id); | |
094a2239 | 1330 | |
6bd6b955 MS |
1331 | xen_device_frontend_set_state(xendev, XenbusStateInitialising, true); |
1332 | } | |
094a2239 PD |
1333 | |
1334 | xendev->exit.notify = xen_device_exit; | |
1335 | qemu_add_exit_notifier(&xendev->exit); | |
108f7bba PD |
1336 | return; |
1337 | ||
1338 | unrealize: | |
b69c3c21 | 1339 | xen_device_unrealize(dev); |
108f7bba PD |
1340 | } |
1341 | ||
094a2239 PD |
1342 | static Property xen_device_props[] = { |
1343 | DEFINE_PROP_UINT16("frontend-id", XenDevice, frontend_id, | |
1344 | DOMID_INVALID), | |
1345 | DEFINE_PROP_END_OF_LIST() | |
1346 | }; | |
1347 | ||
108f7bba PD |
1348 | static void xen_device_class_init(ObjectClass *class, void *data) |
1349 | { | |
1350 | DeviceClass *dev_class = DEVICE_CLASS(class); | |
1351 | ||
1352 | dev_class->realize = xen_device_realize; | |
1353 | dev_class->unrealize = xen_device_unrealize; | |
4f67d30b | 1354 | device_class_set_props(dev_class, xen_device_props); |
108f7bba PD |
1355 | dev_class->bus_type = TYPE_XEN_BUS; |
1356 | } | |
1357 | ||
1358 | static const TypeInfo xen_device_type_info = { | |
1359 | .name = TYPE_XEN_DEVICE, | |
1360 | .parent = TYPE_DEVICE, | |
1361 | .instance_size = sizeof(XenDevice), | |
1362 | .abstract = true, | |
1363 | .class_size = sizeof(XenDeviceClass), | |
1364 | .class_init = xen_device_class_init, | |
1365 | }; | |
1366 | ||
1367 | typedef struct XenBridge { | |
1368 | SysBusDevice busdev; | |
1369 | } XenBridge; | |
1370 | ||
1371 | #define TYPE_XEN_BRIDGE "xen-bridge" | |
1372 | ||
1373 | static const TypeInfo xen_bridge_type_info = { | |
1374 | .name = TYPE_XEN_BRIDGE, | |
1375 | .parent = TYPE_SYS_BUS_DEVICE, | |
1376 | .instance_size = sizeof(XenBridge), | |
1377 | }; | |
1378 | ||
1379 | static void xen_register_types(void) | |
1380 | { | |
1381 | type_register_static(&xen_bridge_type_info); | |
1382 | type_register_static(&xen_bus_type_info); | |
1383 | type_register_static(&xen_device_type_info); | |
1384 | } | |
1385 | ||
1386 | type_init(xen_register_types) | |
1387 | ||
1388 | void xen_bus_init(void) | |
1389 | { | |
3e80f690 | 1390 | DeviceState *dev = qdev_new(TYPE_XEN_BRIDGE); |
108f7bba PD |
1391 | BusState *bus = qbus_create(TYPE_XEN_BUS, dev, NULL); |
1392 | ||
3c6ef471 | 1393 | sysbus_realize_and_unref(SYS_BUS_DEVICE(dev), &error_fatal); |
108f7bba PD |
1394 | qbus_set_bus_hotplug_handler(bus, &error_abort); |
1395 | } |