xref: /openbmc/qemu/ui/dbus.c (revision b7f1bb38) 
1 /*
2  * QEMU DBus display
3  *
4  * Copyright (c) 2021 Marc-André Lureau <marcandre.lureau@redhat.com>
5  *
6  * Permission is hereby granted, free of charge, to any person obtaining a copy
7  * of this software and associated documentation files (the "Software"), to deal
8  * in the Software without restriction, including without limitation the rights
9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10  * copies of the Software, and to permit persons to whom the Software is
11  * furnished to do so, subject to the following conditions:
12  *
13  * The above copyright notice and this permission notice shall be included in
14  * all copies or substantial portions of the Software.
15  *
16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22  * THE SOFTWARE.
23  */
24 #include "qemu/osdep.h"
25 #include "qemu/cutils.h"
26 #include "qemu/error-report.h"
27 #include "qemu/dbus.h"
28 #include "qemu/main-loop.h"
29 #include "qemu/option.h"
30 #include "qom/object_interfaces.h"
31 #include "sysemu/sysemu.h"
32 #include "ui/dbus-module.h"
33 #ifdef CONFIG_OPENGL
34 #include "ui/egl-helpers.h"
35 #include "ui/egl-context.h"
36 #endif
37 #include "audio/audio.h"
38 #include "audio/audio_int.h"
39 #include "qapi/error.h"
40 #include "trace.h"
41 
42 #include "dbus.h"
43 
44 static DBusDisplay *dbus_display;
45 
46 #ifdef CONFIG_OPENGL
47 static QEMUGLContext dbus_create_context(DisplayGLCtx *dgc,
48                                          QEMUGLParams *params)
49 {
50     eglMakeCurrent(qemu_egl_display, EGL_NO_SURFACE, EGL_NO_SURFACE,
51                    qemu_egl_rn_ctx);
52     return qemu_egl_create_context(dgc, params);
53 }
54 
55 static bool
56 dbus_is_compatible_dcl(DisplayGLCtx *dgc,
57                        DisplayChangeListener *dcl)
58 {
59     return
60         dcl->ops == &dbus_gl_dcl_ops ||
61         dcl->ops == &dbus_console_dcl_ops;
62 }
63 
64 static void
65 dbus_create_texture(DisplayGLCtx *ctx, DisplaySurface *surface)
66 {
67     surface_gl_create_texture(ctx->gls, surface);
68 }
69 
70 static void
71 dbus_destroy_texture(DisplayGLCtx *ctx, DisplaySurface *surface)
72 {
73     surface_gl_destroy_texture(ctx->gls, surface);
74 }
75 
76 static void
77 dbus_update_texture(DisplayGLCtx *ctx, DisplaySurface *surface,
78                     int x, int y, int w, int h)
79 {
80     surface_gl_update_texture(ctx->gls, surface, x, y, w, h);
81 }
82 
83 static const DisplayGLCtxOps dbus_gl_ops = {
84     .dpy_gl_ctx_is_compatible_dcl = dbus_is_compatible_dcl,
85     .dpy_gl_ctx_create       = dbus_create_context,
86     .dpy_gl_ctx_destroy      = qemu_egl_destroy_context,
87     .dpy_gl_ctx_make_current = qemu_egl_make_context_current,
88     .dpy_gl_ctx_create_texture = dbus_create_texture,
89     .dpy_gl_ctx_destroy_texture = dbus_destroy_texture,
90     .dpy_gl_ctx_update_texture = dbus_update_texture,
91 };
92 #endif
93 
94 static NotifierList dbus_display_notifiers =
95     NOTIFIER_LIST_INITIALIZER(dbus_display_notifiers);
96 
97 void
98 dbus_display_notifier_add(Notifier *notifier)
99 {
100     notifier_list_add(&dbus_display_notifiers, notifier);
101 }
102 
103 static void
104 dbus_display_notifier_remove(Notifier *notifier)
105 {
106     notifier_remove(notifier);
107 }
108 
109 void
110 dbus_display_notify(DBusDisplayEvent *event)
111 {
112     notifier_list_notify(&dbus_display_notifiers, event);
113 }
114 
115 static void
116 dbus_display_init(Object *o)
117 {
118     DBusDisplay *dd = DBUS_DISPLAY(o);
119     g_autoptr(GDBusObjectSkeleton) vm = NULL;
120 
121 #ifdef CONFIG_OPENGL
122     dd->glctx.ops = &dbus_gl_ops;
123     if (display_opengl) {
124         dd->glctx.gls = qemu_gl_init_shader();
125     }
126 #endif
127     dd->iface = qemu_dbus_display1_vm_skeleton_new();
128     dd->consoles = g_ptr_array_new_with_free_func(g_object_unref);
129 
130     dd->server = g_dbus_object_manager_server_new(DBUS_DISPLAY1_ROOT);
131 
132     vm = g_dbus_object_skeleton_new(DBUS_DISPLAY1_ROOT "/VM");
133     g_dbus_object_skeleton_add_interface(
134         vm, G_DBUS_INTERFACE_SKELETON(dd->iface));
135     g_dbus_object_manager_server_export(dd->server, vm);
136 
137     dbus_clipboard_init(dd);
138     dbus_chardev_init(dd);
139 }
140 
141 static void
142 dbus_display_finalize(Object *o)
143 {
144     DBusDisplay *dd = DBUS_DISPLAY(o);
145 
146     if (dd->notifier.notify) {
147         dbus_display_notifier_remove(&dd->notifier);
148     }
149 
150     qemu_clipboard_peer_unregister(&dd->clipboard_peer);
151     g_clear_object(&dd->clipboard);
152 
153     g_clear_object(&dd->server);
154     g_clear_pointer(&dd->consoles, g_ptr_array_unref);
155     if (dd->add_client_cancellable) {
156         g_cancellable_cancel(dd->add_client_cancellable);
157     }
158     g_clear_object(&dd->add_client_cancellable);
159     g_clear_object(&dd->bus);
160     g_clear_object(&dd->iface);
161     g_free(dd->dbus_addr);
162     g_free(dd->audiodev);
163 #ifdef CONFIG_OPENGL
164     g_clear_pointer(&dd->glctx.gls, qemu_gl_fini_shader);
165 #endif
166     dbus_display = NULL;
167 }
168 
169 static bool
170 dbus_display_add_console(DBusDisplay *dd, int idx, Error **errp)
171 {
172     QemuConsole *con;
173     DBusDisplayConsole *dbus_console;
174 
175     con = qemu_console_lookup_by_index(idx);
176     assert(con);
177 
178     if (qemu_console_is_graphic(con) &&
179         dd->gl_mode != DISPLAYGL_MODE_OFF) {
180         qemu_console_set_display_gl_ctx(con, &dd->glctx);
181     }
182 
183     dbus_console = dbus_display_console_new(dd, con);
184     g_ptr_array_insert(dd->consoles, idx, dbus_console);
185     g_dbus_object_manager_server_export(dd->server,
186                                         G_DBUS_OBJECT_SKELETON(dbus_console));
187     return true;
188 }
189 
190 static void
191 dbus_display_complete(UserCreatable *uc, Error **errp)
192 {
193     DBusDisplay *dd = DBUS_DISPLAY(uc);
194     g_autoptr(GError) err = NULL;
195     g_autofree char *uuid = qemu_uuid_unparse_strdup(&qemu_uuid);
196     g_autoptr(GArray) consoles = NULL;
197     GVariant *console_ids;
198     int idx;
199 
200     if (!object_resolve_path_type("", TYPE_DBUS_DISPLAY, NULL)) {
201         error_setg(errp, "There is already an instance of %s",
202                    TYPE_DBUS_DISPLAY);
203         return;
204     }
205 
206     if (dd->p2p) {
207         /* wait for dbus_display_add_client() */
208         dbus_display = dd;
209     } else if (dd->dbus_addr && *dd->dbus_addr) {
210         dd->bus = g_dbus_connection_new_for_address_sync(dd->dbus_addr,
211                         G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_CLIENT |
212                         G_DBUS_CONNECTION_FLAGS_MESSAGE_BUS_CONNECTION,
213                         NULL, NULL, &err);
214     } else {
215         dd->bus = g_bus_get_sync(G_BUS_TYPE_SESSION, NULL, &err);
216     }
217     if (err) {
218         error_setg(errp, "failed to connect to DBus: %s", err->message);
219         return;
220     }
221 
222     if (dd->audiodev && *dd->audiodev) {
223         AudioState *audio_state = audio_state_by_name(dd->audiodev, errp);
224         if (!audio_state) {
225             return;
226         }
227         if (!g_str_equal(audio_state->drv->name, "dbus")) {
228             error_setg(errp, "Audiodev '%s' is not compatible with DBus",
229                        dd->audiodev);
230             return;
231         }
232         audio_state->drv->set_dbus_server(audio_state, dd->server, dd->p2p);
233     }
234 
235     consoles = g_array_new(FALSE, FALSE, sizeof(guint32));
236     for (idx = 0;; idx++) {
237         if (!qemu_console_lookup_by_index(idx)) {
238             break;
239         }
240         if (!dbus_display_add_console(dd, idx, errp)) {
241             return;
242         }
243         g_array_append_val(consoles, idx);
244     }
245 
246     console_ids = g_variant_new_from_data(
247         G_VARIANT_TYPE("au"),
248         consoles->data, consoles->len * sizeof(guint32), TRUE,
249         (GDestroyNotify)g_array_unref, consoles);
250     g_steal_pointer(&consoles);
251     g_object_set(dd->iface,
252                  "name", qemu_name ?: "QEMU " QEMU_VERSION,
253                  "uuid", uuid,
254                  "console-ids", console_ids,
255                  NULL);
256 
257     if (dd->bus) {
258         g_dbus_object_manager_server_set_connection(dd->server, dd->bus);
259         g_bus_own_name_on_connection(dd->bus, "org.qemu",
260                                      G_BUS_NAME_OWNER_FLAGS_NONE,
261                                      NULL, NULL, NULL, NULL);
262     }
263 }
264 
265 static void
266 dbus_display_add_client_ready(GObject *source_object,
267                               GAsyncResult *res,
268                               gpointer user_data)
269 {
270     g_autoptr(GError) err = NULL;
271     g_autoptr(GDBusConnection) conn = NULL;
272 
273     g_clear_object(&dbus_display->add_client_cancellable);
274 
275     conn = g_dbus_connection_new_finish(res, &err);
276     if (!conn) {
277         error_printf("Failed to accept D-Bus client: %s", err->message);
278     }
279 
280     g_dbus_object_manager_server_set_connection(dbus_display->server, conn);
281     g_dbus_connection_start_message_processing(conn);
282 }
283 
284 
285 static bool
286 dbus_display_add_client(int csock, Error **errp)
287 {
288     g_autoptr(GError) err = NULL;
289     g_autoptr(GSocket) socket = NULL;
290     g_autoptr(GSocketConnection) conn = NULL;
291     g_autofree char *guid = g_dbus_generate_guid();
292 
293     if (!dbus_display) {
294         error_setg(errp, "p2p connections not accepted in bus mode");
295         return false;
296     }
297 
298     if (dbus_display->add_client_cancellable) {
299         g_cancellable_cancel(dbus_display->add_client_cancellable);
300     }
301 
302 #ifdef WIN32
303     socket = g_socket_new_from_fd(_get_osfhandle(csock), &err);
304 #else
305     socket = g_socket_new_from_fd(csock, &err);
306 #endif
307     if (!socket) {
308         error_setg(errp, "Failed to setup D-Bus socket: %s", err->message);
309         close(csock);
310         return false;
311     }
312 #ifdef WIN32
313     /* socket owns the SOCKET handle now, so release our osf handle */
314     qemu_close_socket_osfhandle(csock);
315 #endif
316 
317     conn = g_socket_connection_factory_create_connection(socket);
318 
319     dbus_display->add_client_cancellable = g_cancellable_new();
320 
321     g_dbus_connection_new(G_IO_STREAM(conn),
322                           guid,
323                           G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_SERVER |
324                           G_DBUS_CONNECTION_FLAGS_DELAY_MESSAGE_PROCESSING,
325                           NULL,
326                           dbus_display->add_client_cancellable,
327                           dbus_display_add_client_ready,
328                           NULL);
329 
330     return true;
331 }
332 
333 static bool
334 get_dbus_p2p(Object *o, Error **errp)
335 {
336     DBusDisplay *dd = DBUS_DISPLAY(o);
337 
338     return dd->p2p;
339 }
340 
341 static void
342 set_dbus_p2p(Object *o, bool p2p, Error **errp)
343 {
344     DBusDisplay *dd = DBUS_DISPLAY(o);
345 
346     dd->p2p = p2p;
347 }
348 
349 static char *
350 get_dbus_addr(Object *o, Error **errp)
351 {
352     DBusDisplay *dd = DBUS_DISPLAY(o);
353 
354     return g_strdup(dd->dbus_addr);
355 }
356 
357 static void
358 set_dbus_addr(Object *o, const char *str, Error **errp)
359 {
360     DBusDisplay *dd = DBUS_DISPLAY(o);
361 
362     g_free(dd->dbus_addr);
363     dd->dbus_addr = g_strdup(str);
364 }
365 
366 static char *
367 get_audiodev(Object *o, Error **errp)
368 {
369     DBusDisplay *dd = DBUS_DISPLAY(o);
370 
371     return g_strdup(dd->audiodev);
372 }
373 
374 static void
375 set_audiodev(Object *o, const char *str, Error **errp)
376 {
377     DBusDisplay *dd = DBUS_DISPLAY(o);
378 
379     g_free(dd->audiodev);
380     dd->audiodev = g_strdup(str);
381 }
382 
383 
384 static int
385 get_gl_mode(Object *o, Error **errp)
386 {
387     DBusDisplay *dd = DBUS_DISPLAY(o);
388 
389     return dd->gl_mode;
390 }
391 
392 static void
393 set_gl_mode(Object *o, int val, Error **errp)
394 {
395     DBusDisplay *dd = DBUS_DISPLAY(o);
396 
397     dd->gl_mode = val;
398 }
399 
400 static void
401 dbus_display_class_init(ObjectClass *oc, void *data)
402 {
403     UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc);
404 
405     ucc->complete = dbus_display_complete;
406     object_class_property_add_bool(oc, "p2p", get_dbus_p2p, set_dbus_p2p);
407     object_class_property_add_str(oc, "addr", get_dbus_addr, set_dbus_addr);
408     object_class_property_add_str(oc, "audiodev", get_audiodev, set_audiodev);
409     object_class_property_add_enum(oc, "gl-mode",
410                                    "DisplayGLMode", &DisplayGLMode_lookup,
411                                    get_gl_mode, set_gl_mode);
412 }
413 
414 #define TYPE_CHARDEV_VC "chardev-vc"
415 
416 typedef struct DBusVCClass {
417     DBusChardevClass parent_class;
418 
419     void (*parent_parse)(QemuOpts *opts, ChardevBackend *b, Error **errp);
420 } DBusVCClass;
421 
422 DECLARE_CLASS_CHECKERS(DBusVCClass, DBUS_VC,
423                        TYPE_CHARDEV_VC)
424 
425 static void
426 dbus_vc_parse(QemuOpts *opts, ChardevBackend *backend,
427               Error **errp)
428 {
429     DBusVCClass *klass = DBUS_VC_CLASS(object_class_by_name(TYPE_CHARDEV_VC));
430     const char *name = qemu_opt_get(opts, "name");
431     const char *id = qemu_opts_id(opts);
432 
433     if (name == NULL) {
434         if (g_str_has_prefix(id, "compat_monitor")) {
435             name = "org.qemu.monitor.hmp.0";
436         } else if (g_str_has_prefix(id, "serial")) {
437             name = "org.qemu.console.serial.0";
438         } else {
439             name = "";
440         }
441         if (!qemu_opt_set(opts, "name", name, errp)) {
442             return;
443         }
444     }
445 
446     klass->parent_parse(opts, backend, errp);
447 }
448 
449 static void
450 dbus_vc_class_init(ObjectClass *oc, void *data)
451 {
452     DBusVCClass *klass = DBUS_VC_CLASS(oc);
453     ChardevClass *cc = CHARDEV_CLASS(oc);
454 
455     klass->parent_parse = cc->parse;
456     cc->parse = dbus_vc_parse;
457 }
458 
459 static const TypeInfo dbus_vc_type_info = {
460     .name = TYPE_CHARDEV_VC,
461     .parent = TYPE_CHARDEV_DBUS,
462     .class_size = sizeof(DBusVCClass),
463     .class_init = dbus_vc_class_init,
464 };
465 
466 static void
467 early_dbus_init(DisplayOptions *opts)
468 {
469     DisplayGLMode mode = opts->has_gl ? opts->gl : DISPLAYGL_MODE_OFF;
470 
471     if (mode != DISPLAYGL_MODE_OFF) {
472 #ifdef CONFIG_OPENGL
473         egl_init(opts->u.dbus.rendernode, mode, &error_fatal);
474 #else
475         error_report("dbus: GL rendering is not supported");
476 #endif
477     }
478 
479     type_register(&dbus_vc_type_info);
480 }
481 
482 static void
483 dbus_init(DisplayState *ds, DisplayOptions *opts)
484 {
485     DisplayGLMode mode = opts->has_gl ? opts->gl : DISPLAYGL_MODE_OFF;
486 
487     if (opts->u.dbus.addr && opts->u.dbus.p2p) {
488         error_report("dbus: can't accept both addr=X and p2p=yes options");
489         exit(1);
490     }
491 
492     using_dbus_display = 1;
493 
494     object_new_with_props(TYPE_DBUS_DISPLAY,
495                           object_get_objects_root(),
496                           "dbus-display", &error_fatal,
497                           "addr", opts->u.dbus.addr ?: "",
498                           "audiodev", opts->u.dbus.audiodev ?: "",
499                           "gl-mode", DisplayGLMode_str(mode),
500                           "p2p", yes_no(opts->u.dbus.p2p),
501                           NULL);
502 }
503 
504 static const TypeInfo dbus_display_info = {
505     .name = TYPE_DBUS_DISPLAY,
506     .parent = TYPE_OBJECT,
507     .instance_size = sizeof(DBusDisplay),
508     .instance_init = dbus_display_init,
509     .instance_finalize = dbus_display_finalize,
510     .class_init = dbus_display_class_init,
511     .interfaces = (InterfaceInfo[]) {
512         { TYPE_USER_CREATABLE },
513         { }
514     }
515 };
516 
517 static QemuDisplay qemu_display_dbus = {
518     .type       = DISPLAY_TYPE_DBUS,
519     .early_init = early_dbus_init,
520     .init       = dbus_init,
521     .vc         = "vc",
522 };
523 
524 static void register_dbus(void)
525 {
526     qemu_dbus_display = (struct QemuDBusDisplayOps) {
527         .add_client = dbus_display_add_client,
528     };
529     type_register_static(&dbus_display_info);
530     qemu_display_register(&qemu_display_dbus);
531 }
532 
533 type_init(register_dbus);
534 
535 #ifdef CONFIG_OPENGL
536 module_dep("ui-opengl");
537 #endif
538