ui/dbus.c

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