drivers/gpu/drm/drm_atomic.c

   1 /*
   2  * Copyright (C) 2014 Red Hat
   3  * Copyright (C) 2014 Intel Corp.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   9  * and/or sell copies of the Software, and to permit persons to whom the
  10  * Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice shall be included in
  13  * all copies or substantial portions of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  19  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  20  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  21  * OTHER DEALINGS IN THE SOFTWARE.
  22  *
  23  * Authors:
  24  * Rob Clark <robdclark@gmail.com>
  25  * Daniel Vetter <daniel.vetter@ffwll.ch>
  26  */
  27
  28
  29 #include <drm/drmP.h>
  30 #include <drm/drm_atomic.h>
  31 #include <drm/drm_plane_helper.h>
  32
  33 static void kfree_state(struct drm_atomic_state *state)
  34 {
  35         kfree(state->connectors);
  36         kfree(state->connector_states);
  37         kfree(state->crtcs);
  38         kfree(state->crtc_states);
  39         kfree(state->planes);
  40         kfree(state->plane_states);
  41         kfree(state);
  42 }
  43
  44 /**
  45  * drm_atomic_state_alloc - allocate atomic state
  46  * @dev: DRM device
  47  *
  48  * This allocates an empty atomic state to track updates.
  49  */
  50 struct drm_atomic_state *
  51 drm_atomic_state_alloc(struct drm_device *dev)
  52 {
  53         struct drm_atomic_state *state;
  54
  55         state = kzalloc(sizeof(*state), GFP_KERNEL);
  56         if (!state)
  57                 return NULL;
  58
  59         state->num_connector = ACCESS_ONCE(dev->mode_config.num_connector);
  60
  61         state->crtcs = kcalloc(dev->mode_config.num_crtc,
  62                                sizeof(*state->crtcs), GFP_KERNEL);
  63         if (!state->crtcs)
  64                 goto fail;
  65         state->crtc_states = kcalloc(dev->mode_config.num_crtc,
  66                                      sizeof(*state->crtc_states), GFP_KERNEL);
  67         if (!state->crtc_states)
  68                 goto fail;
  69         state->planes = kcalloc(dev->mode_config.num_total_plane,
  70                                 sizeof(*state->planes), GFP_KERNEL);
  71         if (!state->planes)
  72                 goto fail;
  73         state->plane_states = kcalloc(dev->mode_config.num_total_plane,
  74                                       sizeof(*state->plane_states), GFP_KERNEL);
  75         if (!state->plane_states)
  76                 goto fail;
  77         state->connectors = kcalloc(state->num_connector,
  78                                     sizeof(*state->connectors),
  79                                     GFP_KERNEL);
  80         if (!state->connectors)
  81                 goto fail;
  82         state->connector_states = kcalloc(state->num_connector,
  83                                           sizeof(*state->connector_states),
  84                                           GFP_KERNEL);
  85         if (!state->connector_states)
  86                 goto fail;
  87
  88         state->dev = dev;
  89
  90         DRM_DEBUG_KMS("Allocate atomic state %p\n", state);
  91
  92         return state;
  93 fail:
  94         kfree_state(state);
  95
  96         return NULL;
  97 }
  98 EXPORT_SYMBOL(drm_atomic_state_alloc);
  99
 100 /**
 101  * drm_atomic_state_clear - clear state object
 102  * @state: atomic state
 103  *
 104  * When the w/w mutex algorithm detects a deadlock we need to back off and drop
 105  * all locks. So someone else could sneak in and change the current modeset
 106  * configuration. Which means that all the state assembled in @state is no
 107  * longer an atomic update to the current state, but to some arbitrary earlier
 108  * state. Which could break assumptions the driver's ->atomic_check likely
 109  * relies on.
 110  *
 111  * Hence we must clear all cached state and completely start over, using this
 112  * function.
 113  */
 114 void drm_atomic_state_clear(struct drm_atomic_state *state)
 115 {
 116         struct drm_device *dev = state->dev;
 117         struct drm_mode_config *config = &dev->mode_config;
 118         int i;
 119
 120         DRM_DEBUG_KMS("Clearing atomic state %p\n", state);
 121
 122         for (i = 0; i < state->num_connector; i++) {
 123                 struct drm_connector *connector = state->connectors[i];
 124
 125                 if (!connector)
 126                         continue;
 127
 128                 WARN_ON(!drm_modeset_is_locked(&config->connection_mutex));
 129
 130                 connector->funcs->atomic_destroy_state(connector,
 131                                                        state->connector_states[i]);
 132         }
 133
 134         for (i = 0; i < config->num_crtc; i++) {
 135                 struct drm_crtc *crtc = state->crtcs[i];
 136
 137                 if (!crtc)
 138                         continue;
 139
 140                 crtc->funcs->atomic_destroy_state(crtc,
 141                                                   state->crtc_states[i]);
 142         }
 143
 144         for (i = 0; i < config->num_total_plane; i++) {
 145                 struct drm_plane *plane = state->planes[i];
 146
 147                 if (!plane)
 148                         continue;
 149
 150                 plane->funcs->atomic_destroy_state(plane,
 151                                                    state->plane_states[i]);
 152         }
 153 }
 154 EXPORT_SYMBOL(drm_atomic_state_clear);
 155
 156 /**
 157  * drm_atomic_state_free - free all memory for an atomic state
 158  * @state: atomic state to deallocate
 159  *
 160  * This frees all memory associated with an atomic state, including all the
 161  * per-object state for planes, crtcs and connectors.
 162  */
 163 void drm_atomic_state_free(struct drm_atomic_state *state)
 164 {
 165         drm_atomic_state_clear(state);
 166
 167         DRM_DEBUG_KMS("Freeing atomic state %p\n", state);
 168
 169         kfree_state(state);
 170 }
 171 EXPORT_SYMBOL(drm_atomic_state_free);
 172
 173 /**
 174  * drm_atomic_get_crtc_state - get crtc state
 175  * @state: global atomic state object
 176  * @crtc: crtc to get state object for
 177  *
 178  * This function returns the crtc state for the given crtc, allocating it if
 179  * needed. It will also grab the relevant crtc lock to make sure that the state
 180  * is consistent.
 181  *
 182  * Returns:
 183  *
 184  * Either the allocated state or the error code encoded into the pointer. When
 185  * the error is EDEADLK then the w/w mutex code has detected a deadlock and the
 186  * entire atomic sequence must be restarted. All other errors are fatal.
 187  */
 188 struct drm_crtc_state *
 189 drm_atomic_get_crtc_state(struct drm_atomic_state *state,
 190                           struct drm_crtc *crtc)
 191 {
 192         int ret, index;
 193         struct drm_crtc_state *crtc_state;
 194
 195         index = drm_crtc_index(crtc);
 196
 197         if (state->crtc_states[index])
 198                 return state->crtc_states[index];
 199
 200         ret = drm_modeset_lock(&crtc->mutex, state->acquire_ctx);
 201         if (ret)
 202                 return ERR_PTR(ret);
 203
 204         crtc_state = crtc->funcs->atomic_duplicate_state(crtc);
 205         if (!crtc_state)
 206                 return ERR_PTR(-ENOMEM);
 207
 208         state->crtc_states[index] = crtc_state;
 209         state->crtcs[index] = crtc;
 210         crtc_state->state = state;
 211
 212         DRM_DEBUG_KMS("Added [CRTC:%d] %p state to %p\n",
 213                       crtc->base.id, crtc_state, state);
 214
 215         return crtc_state;
 216 }
 217 EXPORT_SYMBOL(drm_atomic_get_crtc_state);
 218
 219 /**
 220  * drm_atomic_get_plane_state - get plane state
 221  * @state: global atomic state object
 222  * @plane: plane to get state object for
 223  *
 224  * This function returns the plane state for the given plane, allocating it if
 225  * needed. It will also grab the relevant plane lock to make sure that the state
 226  * is consistent.
 227  *
 228  * Returns:
 229  *
 230  * Either the allocated state or the error code encoded into the pointer. When
 231  * the error is EDEADLK then the w/w mutex code has detected a deadlock and the
 232  * entire atomic sequence must be restarted. All other errors are fatal.
 233  */
 234 struct drm_plane_state *
 235 drm_atomic_get_plane_state(struct drm_atomic_state *state,
 236                           struct drm_plane *plane)
 237 {
 238         int ret, index;
 239         struct drm_plane_state *plane_state;
 240
 241         index = drm_plane_index(plane);
 242
 243         if (state->plane_states[index])
 244                 return state->plane_states[index];
 245
 246         /*
 247          * TODO: We currently don't have per-plane mutexes. So instead of trying
 248          * crazy tricks with deferring plane->crtc and hoping for the best just
 249          * grab all crtc locks. Once we have per-plane locks we must update this
 250          * to only take the plane mutex.
 251          */
 252         ret = drm_modeset_lock(&plane->mutex, state->acquire_ctx);
 253         if (ret)
 254                 return ERR_PTR(ret);
 255
 256         plane_state = plane->funcs->atomic_duplicate_state(plane);
 257         if (!plane_state)
 258                 return ERR_PTR(-ENOMEM);
 259
 260         state->plane_states[index] = plane_state;
 261         state->planes[index] = plane;
 262         plane_state->state = state;
 263
 264         DRM_DEBUG_KMS("Added [PLANE:%d] %p state to %p\n",
 265                       plane->base.id, plane_state, state);
 266
 267         if (plane_state->crtc) {
 268                 struct drm_crtc_state *crtc_state;
 269
 270                 crtc_state = drm_atomic_get_crtc_state(state,
 271                                                        plane_state->crtc);
 272                 if (IS_ERR(crtc_state))
 273                         return ERR_CAST(crtc_state);
 274         }
 275
 276         return plane_state;
 277 }
 278 EXPORT_SYMBOL(drm_atomic_get_plane_state);
 279
 280 /**
 281  * drm_atomic_get_connector_state - get connector state
 282  * @state: global atomic state object
 283  * @connector: connector to get state object for
 284  *
 285  * This function returns the connector state for the given connector,
 286  * allocating it if needed. It will also grab the relevant connector lock to
 287  * make sure that the state is consistent.
 288  *
 289  * Returns:
 290  *
 291  * Either the allocated state or the error code encoded into the pointer. When
 292  * the error is EDEADLK then the w/w mutex code has detected a deadlock and the
 293  * entire atomic sequence must be restarted. All other errors are fatal.
 294  */
 295 struct drm_connector_state *
 296 drm_atomic_get_connector_state(struct drm_atomic_state *state,
 297                           struct drm_connector *connector)
 298 {
 299         int ret, index;
 300         struct drm_mode_config *config = &connector->dev->mode_config;
 301         struct drm_connector_state *connector_state;
 302
 303         ret = drm_modeset_lock(&config->connection_mutex, state->acquire_ctx);
 304         if (ret)
 305                 return ERR_PTR(ret);
 306
 307         index = drm_connector_index(connector);
 308
 309         /*
 310          * Construction of atomic state updates can race with a connector
 311          * hot-add which might overflow. In this case flip the table and just
 312          * restart the entire ioctl - no one is fast enough to livelock a cpu
 313          * with physical hotplug events anyway.
 314          *
 315          * Note that we only grab the indexes once we have the right lock to
 316          * prevent hotplug/unplugging of connectors. So removal is no problem,
 317          * at most the array is a bit too large.
 318          */
 319         if (index >= state->num_connector) {
 320                 DRM_DEBUG_KMS("Hot-added connector would overflow state array, restarting\n");
 321                 return ERR_PTR(-EAGAIN);
 322         }
 323
 324         if (state->connector_states[index])
 325                 return state->connector_states[index];
 326
 327         connector_state = connector->funcs->atomic_duplicate_state(connector);
 328         if (!connector_state)
 329                 return ERR_PTR(-ENOMEM);
 330
 331         state->connector_states[index] = connector_state;
 332         state->connectors[index] = connector;
 333         connector_state->state = state;
 334
 335         DRM_DEBUG_KMS("Added [CONNECTOR:%d] %p state to %p\n",
 336                       connector->base.id, connector_state, state);
 337
 338         if (connector_state->crtc) {
 339                 struct drm_crtc_state *crtc_state;
 340
 341                 crtc_state = drm_atomic_get_crtc_state(state,
 342                                                        connector_state->crtc);
 343                 if (IS_ERR(crtc_state))
 344                         return ERR_CAST(crtc_state);
 345         }
 346
 347         return connector_state;
 348 }
 349 EXPORT_SYMBOL(drm_atomic_get_connector_state);
 350
 351 /**
 352  * drm_atomic_set_crtc_for_plane - set crtc for plane
 353  * @plane_state: atomic state object for the plane
 354  * @crtc: crtc to use for the plane
 355  *
 356  * Changing the assigned crtc for a plane requires us to grab the lock and state
 357  * for the new crtc, as needed. This function takes care of all these details
 358  * besides updating the pointer in the state object itself.
 359  *
 360  * Returns:
 361  * 0 on success or can fail with -EDEADLK or -ENOMEM. When the error is EDEADLK
 362  * then the w/w mutex code has detected a deadlock and the entire atomic
 363  * sequence must be restarted. All other errors are fatal.
 364  */
 365 int
 366 drm_atomic_set_crtc_for_plane(struct drm_plane_state *plane_state,
 367                               struct drm_crtc *crtc)
 368 {
 369         struct drm_crtc_state *crtc_state;
 370
 371         if (crtc) {
 372                 crtc_state = drm_atomic_get_crtc_state(plane_state->state,
 373                                                        crtc);
 374                 if (IS_ERR(crtc_state))
 375                         return PTR_ERR(crtc_state);
 376         }
 377
 378         plane_state->crtc = crtc;
 379
 380         if (crtc)
 381                 DRM_DEBUG_KMS("Link plane state %p to [CRTC:%d]\n",
 382                               plane_state, crtc->base.id);
 383         else
 384                 DRM_DEBUG_KMS("Link plane state %p to [NOCRTC]\n", plane_state);
 385
 386         return 0;
 387 }
 388 EXPORT_SYMBOL(drm_atomic_set_crtc_for_plane);
 389
 390 /**
 391  * drm_atomic_set_fb_for_plane - set crtc for plane
 392  * @plane_state: atomic state object for the plane
 393  * @fb: fb to use for the plane
 394  *
 395  * Changing the assigned framebuffer for a plane requires us to grab a reference
 396  * to the new fb and drop the reference to the old fb, if there is one. This
 397  * function takes care of all these details besides updating the pointer in the
 398  * state object itself.
 399  */
 400 void
 401 drm_atomic_set_fb_for_plane(struct drm_plane_state *plane_state,
 402                             struct drm_framebuffer *fb)
 403 {
 404         if (plane_state->fb)
 405                 drm_framebuffer_unreference(plane_state->fb);
 406         if (fb)
 407                 drm_framebuffer_reference(fb);
 408         plane_state->fb = fb;
 409
 410         if (fb)
 411                 DRM_DEBUG_KMS("Set [FB:%d] for plane state %p\n",
 412                               fb->base.id, plane_state);
 413         else
 414                 DRM_DEBUG_KMS("Set [NOFB] for plane state %p\n", plane_state);
 415 }
 416 EXPORT_SYMBOL(drm_atomic_set_fb_for_plane);
 417
 418 /**
 419  * drm_atomic_set_crtc_for_connector - set crtc for connector
 420  * @conn_state: atomic state object for the connector
 421  * @crtc: crtc to use for the connector
 422  *
 423  * Changing the assigned crtc for a connector requires us to grab the lock and
 424  * state for the new crtc, as needed. This function takes care of all these
 425  * details besides updating the pointer in the state object itself.
 426  *
 427  * Returns:
 428  * 0 on success or can fail with -EDEADLK or -ENOMEM. When the error is EDEADLK
 429  * then the w/w mutex code has detected a deadlock and the entire atomic
 430  * sequence must be restarted. All other errors are fatal.
 431  */
 432 int
 433 drm_atomic_set_crtc_for_connector(struct drm_connector_state *conn_state,
 434                                   struct drm_crtc *crtc)
 435 {
 436         struct drm_crtc_state *crtc_state;
 437
 438         if (crtc) {
 439                 crtc_state = drm_atomic_get_crtc_state(conn_state->state, crtc);
 440                 if (IS_ERR(crtc_state))
 441                         return PTR_ERR(crtc_state);
 442         }
 443
 444         conn_state->crtc = crtc;
 445
 446         if (crtc)
 447                 DRM_DEBUG_KMS("Link connector state %p to [CRTC:%d]\n",
 448                               conn_state, crtc->base.id);
 449         else
 450                 DRM_DEBUG_KMS("Link connector state %p to [NOCRTC]\n",
 451                               conn_state);
 452
 453         return 0;
 454 }
 455 EXPORT_SYMBOL(drm_atomic_set_crtc_for_connector);
 456
 457 /**
 458  * drm_atomic_add_affected_connectors - add connectors for crtc
 459  * @state: atomic state
 460  * @crtc: DRM crtc
 461  *
 462  * This function walks the current configuration and adds all connectors
 463  * currently using @crtc to the atomic configuration @state. Note that this
 464  * function must acquire the connection mutex. This can potentially cause
 465  * unneeded seralization if the update is just for the planes on one crtc. Hence
 466  * drivers and helpers should only call this when really needed (e.g. when a
 467  * full modeset needs to happen due to some change).
 468  *
 469  * Returns:
 470  * 0 on success or can fail with -EDEADLK or -ENOMEM. When the error is EDEADLK
 471  * then the w/w mutex code has detected a deadlock and the entire atomic
 472  * sequence must be restarted. All other errors are fatal.
 473  */
 474 int
 475 drm_atomic_add_affected_connectors(struct drm_atomic_state *state,
 476                                    struct drm_crtc *crtc)
 477 {
 478         struct drm_mode_config *config = &state->dev->mode_config;
 479         struct drm_connector *connector;
 480         struct drm_connector_state *conn_state;
 481         int ret;
 482
 483         ret = drm_modeset_lock(&config->connection_mutex, state->acquire_ctx);
 484         if (ret)
 485                 return ret;
 486
 487         DRM_DEBUG_KMS("Adding all current connectors for [CRTC:%d] to %p\n",
 488                       crtc->base.id, state);
 489
 490         /*
 491          * Changed connectors are already in @state, so only need to look at the
 492          * current configuration.
 493          */
 494         list_for_each_entry(connector, &config->connector_list, head) {
 495                 if (connector->state->crtc != crtc)
 496                         continue;
 497
 498                 conn_state = drm_atomic_get_connector_state(state, connector);
 499                 if (IS_ERR(conn_state))
 500                         return PTR_ERR(conn_state);
 501         }
 502
 503         return 0;
 504 }
 505 EXPORT_SYMBOL(drm_atomic_add_affected_connectors);
 506
 507 /**
 508  * drm_atomic_connectors_for_crtc - count number of connected outputs
 509  * @state: atomic state
 510  * @crtc: DRM crtc
 511  *
 512  * This function counts all connectors which will be connected to @crtc
 513  * according to @state. Useful to recompute the enable state for @crtc.
 514  */
 515 int
 516 drm_atomic_connectors_for_crtc(struct drm_atomic_state *state,
 517                                struct drm_crtc *crtc)
 518 {
 519         int i, num_connected_connectors = 0;
 520
 521         for (i = 0; i < state->num_connector; i++) {
 522                 struct drm_connector_state *conn_state;
 523
 524                 conn_state = state->connector_states[i];
 525
 526                 if (conn_state && conn_state->crtc == crtc)
 527                         num_connected_connectors++;
 528         }
 529
 530         DRM_DEBUG_KMS("State %p has %i connectors for [CRTC:%d]\n",
 531                       state, num_connected_connectors, crtc->base.id);
 532
 533         return num_connected_connectors;
 534 }
 535 EXPORT_SYMBOL(drm_atomic_connectors_for_crtc);
 536
 537 /**
 538  * drm_atomic_legacy_backoff - locking backoff for legacy ioctls
 539  * @state: atomic state
 540  *
 541  * This function should be used by legacy entry points which don't understand
 542  * -EDEADLK semantics. For simplicity this one will grab all modeset locks after
 543  *  the slowpath completed.
 544  */
 545 void drm_atomic_legacy_backoff(struct drm_atomic_state *state)
 546 {
 547         int ret;
 548
 549 retry:
 550         drm_modeset_backoff(state->acquire_ctx);
 551
 552         ret = drm_modeset_lock(&state->dev->mode_config.connection_mutex,
 553                                state->acquire_ctx);
 554         if (ret)
 555                 goto retry;
 556         ret = drm_modeset_lock_all_crtcs(state->dev,
 557                                          state->acquire_ctx);
 558         if (ret)
 559                 goto retry;
 560 }
 561 EXPORT_SYMBOL(drm_atomic_legacy_backoff);
 562
 563 /**
 564  * drm_atomic_check_only - check whether a given config would work
 565  * @state: atomic configuration to check
 566  *
 567  * Note that this function can return -EDEADLK if the driver needed to acquire
 568  * more locks but encountered a deadlock. The caller must then do the usual w/w
 569  * backoff dance and restart. All other errors are fatal.
 570  *
 571  * Returns:
 572  * 0 on success, negative error code on failure.
 573  */
 574 int drm_atomic_check_only(struct drm_atomic_state *state)
 575 {
 576         struct drm_mode_config *config = &state->dev->mode_config;
 577
 578         DRM_DEBUG_KMS("checking %p\n", state);
 579
 580         if (config->funcs->atomic_check)
 581                 return config->funcs->atomic_check(state->dev, state);
 582         else
 583                 return 0;
 584 }
 585 EXPORT_SYMBOL(drm_atomic_check_only);
 586
 587 /**
 588  * drm_atomic_commit - commit configuration atomically
 589  * @state: atomic configuration to check
 590  *
 591  * Note that this function can return -EDEADLK if the driver needed to acquire
 592  * more locks but encountered a deadlock. The caller must then do the usual w/w
 593  * backoff dance and restart. All other errors are fatal.
 594  *
 595  * Also note that on successful execution ownership of @state is transferred
 596  * from the caller of this function to the function itself. The caller must not
 597  * free or in any other way access @state. If the function fails then the caller
 598  * must clean up @state itself.
 599  *
 600  * Returns:
 601  * 0 on success, negative error code on failure.
 602  */
 603 int drm_atomic_commit(struct drm_atomic_state *state)
 604 {
 605         struct drm_mode_config *config = &state->dev->mode_config;
 606         int ret;
 607
 608         ret = drm_atomic_check_only(state);
 609         if (ret)
 610                 return ret;
 611
 612         DRM_DEBUG_KMS("commiting %p\n", state);
 613
 614         return config->funcs->atomic_commit(state->dev, state, false);
 615 }
 616 EXPORT_SYMBOL(drm_atomic_commit);
 617
 618 /**
 619  * drm_atomic_async_commit - atomic&async configuration commit
 620  * @state: atomic configuration to check
 621  *
 622  * Note that this function can return -EDEADLK if the driver needed to acquire
 623  * more locks but encountered a deadlock. The caller must then do the usual w/w
 624  * backoff dance and restart. All other errors are fatal.
 625  *
 626  * Also note that on successful execution ownership of @state is transferred
 627  * from the caller of this function to the function itself. The caller must not
 628  * free or in any other way access @state. If the function fails then the caller
 629  * must clean up @state itself.
 630  *
 631  * Returns:
 632  * 0 on success, negative error code on failure.
 633  */
 634 int drm_atomic_async_commit(struct drm_atomic_state *state)
 635 {
 636         struct drm_mode_config *config = &state->dev->mode_config;
 637         int ret;
 638
 639         ret = drm_atomic_check_only(state);
 640         if (ret)
 641                 return ret;
 642
 643         DRM_DEBUG_KMS("commiting %p asynchronously\n", state);
 644
 645         return config->funcs->atomic_commit(state->dev, state, true);
 646 }
 647 EXPORT_SYMBOL(drm_atomic_async_commit);