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 /**
  34  * drm_atomic_state_default_release -
  35  * release memory initialized by drm_atomic_state_init
  36  * @state: atomic state
  37  *
  38  * Free all the memory allocated by drm_atomic_state_init.
  39  * This is useful for drivers that subclass the atomic state.
  40  */
  41 void drm_atomic_state_default_release(struct drm_atomic_state *state)
  42 {
  43         kfree(state->connectors);
  44         kfree(state->connector_states);
  45         kfree(state->crtcs);
  46         kfree(state->crtc_states);
  47         kfree(state->planes);
  48         kfree(state->plane_states);
  49 }
  50 EXPORT_SYMBOL(drm_atomic_state_default_release);
  51
  52 /**
  53  * drm_atomic_state_init - init new atomic state
  54  * @dev: DRM device
  55  * @state: atomic state
  56  *
  57  * Default implementation for filling in a new atomic state.
  58  * This is useful for drivers that subclass the atomic state.
  59  */
  60 int
  61 drm_atomic_state_init(struct drm_device *dev, struct drm_atomic_state *state)
  62 {
  63         /* TODO legacy paths should maybe do a better job about
  64          * setting this appropriately?
  65          */
  66         state->allow_modeset = true;
  67
  68         state->num_connector = ACCESS_ONCE(dev->mode_config.num_connector);
  69
  70         state->crtcs = kcalloc(dev->mode_config.num_crtc,
  71                                sizeof(*state->crtcs), GFP_KERNEL);
  72         if (!state->crtcs)
  73                 goto fail;
  74         state->crtc_states = kcalloc(dev->mode_config.num_crtc,
  75                                      sizeof(*state->crtc_states), GFP_KERNEL);
  76         if (!state->crtc_states)
  77                 goto fail;
  78         state->planes = kcalloc(dev->mode_config.num_total_plane,
  79                                 sizeof(*state->planes), GFP_KERNEL);
  80         if (!state->planes)
  81                 goto fail;
  82         state->plane_states = kcalloc(dev->mode_config.num_total_plane,
  83                                       sizeof(*state->plane_states), GFP_KERNEL);
  84         if (!state->plane_states)
  85                 goto fail;
  86         state->connectors = kcalloc(state->num_connector,
  87                                     sizeof(*state->connectors),
  88                                     GFP_KERNEL);
  89         if (!state->connectors)
  90                 goto fail;
  91         state->connector_states = kcalloc(state->num_connector,
  92                                           sizeof(*state->connector_states),
  93                                           GFP_KERNEL);
  94         if (!state->connector_states)
  95                 goto fail;
  96
  97         state->dev = dev;
  98
  99         DRM_DEBUG_ATOMIC("Allocated atomic state %p\n", state);
 100
 101         return 0;
 102 fail:
 103         drm_atomic_state_default_release(state);
 104         return -ENOMEM;
 105 }
 106 EXPORT_SYMBOL(drm_atomic_state_init);
 107
 108 /**
 109  * drm_atomic_state_alloc - allocate atomic state
 110  * @dev: DRM device
 111  *
 112  * This allocates an empty atomic state to track updates.
 113  */
 114 struct drm_atomic_state *
 115 drm_atomic_state_alloc(struct drm_device *dev)
 116 {
 117         struct drm_mode_config *config = &dev->mode_config;
 118         struct drm_atomic_state *state;
 119
 120         if (!config->funcs->atomic_state_alloc) {
 121                 state = kzalloc(sizeof(*state), GFP_KERNEL);
 122                 if (!state)
 123                         return NULL;
 124                 if (drm_atomic_state_init(dev, state) < 0) {
 125                         kfree(state);
 126                         return NULL;
 127                 }
 128                 return state;
 129         }
 130
 131         return config->funcs->atomic_state_alloc(dev);
 132 }
 133 EXPORT_SYMBOL(drm_atomic_state_alloc);
 134
 135 /**
 136  * drm_atomic_state_default_clear - clear base atomic state
 137  * @state: atomic state
 138  *
 139  * Default implementation for clearing atomic state.
 140  * This is useful for drivers that subclass the atomic state.
 141  */
 142 void drm_atomic_state_default_clear(struct drm_atomic_state *state)
 143 {
 144         struct drm_device *dev = state->dev;
 145         struct drm_mode_config *config = &dev->mode_config;
 146         int i;
 147
 148         DRM_DEBUG_ATOMIC("Clearing atomic state %p\n", state);
 149
 150         for (i = 0; i < state->num_connector; i++) {
 151                 struct drm_connector *connector = state->connectors[i];
 152
 153                 if (!connector)
 154                         continue;
 155
 156                 /*
 157                  * FIXME: Async commits can race with connector unplugging and
 158                  * there's currently nothing that prevents cleanup up state for
 159                  * deleted connectors. As long as the callback doesn't look at
 160                  * the connector we'll be fine though, so make sure that's the
 161                  * case by setting all connector pointers to NULL.
 162                  */
 163                 state->connector_states[i]->connector = NULL;
 164                 connector->funcs->atomic_destroy_state(NULL,
 165                                                        state->connector_states[i]);
 166                 state->connectors[i] = NULL;
 167                 state->connector_states[i] = NULL;
 168         }
 169
 170         for (i = 0; i < config->num_crtc; i++) {
 171                 struct drm_crtc *crtc = state->crtcs[i];
 172
 173                 if (!crtc)
 174                         continue;
 175
 176                 crtc->funcs->atomic_destroy_state(crtc,
 177                                                   state->crtc_states[i]);
 178                 state->crtcs[i] = NULL;
 179                 state->crtc_states[i] = NULL;
 180         }
 181
 182         for (i = 0; i < config->num_total_plane; i++) {
 183                 struct drm_plane *plane = state->planes[i];
 184
 185                 if (!plane)
 186                         continue;
 187
 188                 plane->funcs->atomic_destroy_state(plane,
 189                                                    state->plane_states[i]);
 190                 state->planes[i] = NULL;
 191                 state->plane_states[i] = NULL;
 192         }
 193 }
 194 EXPORT_SYMBOL(drm_atomic_state_default_clear);
 195
 196 /**
 197  * drm_atomic_state_clear - clear state object
 198  * @state: atomic state
 199  *
 200  * When the w/w mutex algorithm detects a deadlock we need to back off and drop
 201  * all locks. So someone else could sneak in and change the current modeset
 202  * configuration. Which means that all the state assembled in @state is no
 203  * longer an atomic update to the current state, but to some arbitrary earlier
 204  * state. Which could break assumptions the driver's ->atomic_check likely
 205  * relies on.
 206  *
 207  * Hence we must clear all cached state and completely start over, using this
 208  * function.
 209  */
 210 void drm_atomic_state_clear(struct drm_atomic_state *state)
 211 {
 212         struct drm_device *dev = state->dev;
 213         struct drm_mode_config *config = &dev->mode_config;
 214
 215         if (config->funcs->atomic_state_clear)
 216                 config->funcs->atomic_state_clear(state);
 217         else
 218                 drm_atomic_state_default_clear(state);
 219 }
 220 EXPORT_SYMBOL(drm_atomic_state_clear);
 221
 222 /**
 223  * drm_atomic_state_free - free all memory for an atomic state
 224  * @state: atomic state to deallocate
 225  *
 226  * This frees all memory associated with an atomic state, including all the
 227  * per-object state for planes, crtcs and connectors.
 228  */
 229 void drm_atomic_state_free(struct drm_atomic_state *state)
 230 {
 231         struct drm_device *dev;
 232         struct drm_mode_config *config;
 233
 234         if (!state)
 235                 return;
 236
 237         dev = state->dev;
 238         config = &dev->mode_config;
 239
 240         drm_atomic_state_clear(state);
 241
 242         DRM_DEBUG_ATOMIC("Freeing atomic state %p\n", state);
 243
 244         if (config->funcs->atomic_state_free) {
 245                 config->funcs->atomic_state_free(state);
 246         } else {
 247                 drm_atomic_state_default_release(state);
 248                 kfree(state);
 249         }
 250 }
 251 EXPORT_SYMBOL(drm_atomic_state_free);
 252
 253 /**
 254  * drm_atomic_get_crtc_state - get crtc state
 255  * @state: global atomic state object
 256  * @crtc: crtc to get state object for
 257  *
 258  * This function returns the crtc state for the given crtc, allocating it if
 259  * needed. It will also grab the relevant crtc lock to make sure that the state
 260  * is consistent.
 261  *
 262  * Returns:
 263  *
 264  * Either the allocated state or the error code encoded into the pointer. When
 265  * the error is EDEADLK then the w/w mutex code has detected a deadlock and the
 266  * entire atomic sequence must be restarted. All other errors are fatal.
 267  */
 268 struct drm_crtc_state *
 269 drm_atomic_get_crtc_state(struct drm_atomic_state *state,
 270                           struct drm_crtc *crtc)
 271 {
 272         int ret, index = drm_crtc_index(crtc);
 273         struct drm_crtc_state *crtc_state;
 274
 275         crtc_state = drm_atomic_get_existing_crtc_state(state, crtc);
 276         if (crtc_state)
 277                 return crtc_state;
 278
 279         ret = drm_modeset_lock(&crtc->mutex, state->acquire_ctx);
 280         if (ret)
 281                 return ERR_PTR(ret);
 282
 283         crtc_state = crtc->funcs->atomic_duplicate_state(crtc);
 284         if (!crtc_state)
 285                 return ERR_PTR(-ENOMEM);
 286
 287         state->crtc_states[index] = crtc_state;
 288         state->crtcs[index] = crtc;
 289         crtc_state->state = state;
 290
 291         DRM_DEBUG_ATOMIC("Added [CRTC:%d] %p state to %p\n",
 292                          crtc->base.id, crtc_state, state);
 293
 294         return crtc_state;
 295 }
 296 EXPORT_SYMBOL(drm_atomic_get_crtc_state);
 297
 298 /**
 299  * drm_atomic_set_mode_for_crtc - set mode for CRTC
 300  * @state: the CRTC whose incoming state to update
 301  * @mode: kernel-internal mode to use for the CRTC, or NULL to disable
 302  *
 303  * Set a mode (originating from the kernel) on the desired CRTC state. Does
 304  * not change any other state properties, including enable, active, or
 305  * mode_changed.
 306  *
 307  * RETURNS:
 308  * Zero on success, error code on failure. Cannot return -EDEADLK.
 309  */
 310 int drm_atomic_set_mode_for_crtc(struct drm_crtc_state *state,
 311                                  struct drm_display_mode *mode)
 312 {
 313         struct drm_mode_modeinfo umode;
 314
 315         /* Early return for no change. */
 316         if (mode && memcmp(&state->mode, mode, sizeof(*mode)) == 0)
 317                 return 0;
 318
 319         drm_property_unreference_blob(state->mode_blob);
 320         state->mode_blob = NULL;
 321
 322         if (mode) {
 323                 drm_mode_convert_to_umode(&umode, mode);
 324                 state->mode_blob =
 325                         drm_property_create_blob(state->crtc->dev,
 326                                                  sizeof(umode),
 327                                                  &umode);
 328                 if (IS_ERR(state->mode_blob))
 329                         return PTR_ERR(state->mode_blob);
 330
 331                 drm_mode_copy(&state->mode, mode);
 332                 state->enable = true;
 333                 DRM_DEBUG_ATOMIC("Set [MODE:%s] for CRTC state %p\n",
 334                                  mode->name, state);
 335         } else {
 336                 memset(&state->mode, 0, sizeof(state->mode));
 337                 state->enable = false;
 338                 DRM_DEBUG_ATOMIC("Set [NOMODE] for CRTC state %p\n",
 339                                  state);
 340         }
 341
 342         return 0;
 343 }
 344 EXPORT_SYMBOL(drm_atomic_set_mode_for_crtc);
 345
 346 /**
 347  * drm_atomic_set_mode_prop_for_crtc - set mode for CRTC
 348  * @state: the CRTC whose incoming state to update
 349  * @blob: pointer to blob property to use for mode
 350  *
 351  * Set a mode (originating from a blob property) on the desired CRTC state.
 352  * This function will take a reference on the blob property for the CRTC state,
 353  * and release the reference held on the state's existing mode property, if any
 354  * was set.
 355  *
 356  * RETURNS:
 357  * Zero on success, error code on failure. Cannot return -EDEADLK.
 358  */
 359 int drm_atomic_set_mode_prop_for_crtc(struct drm_crtc_state *state,
 360                                       struct drm_property_blob *blob)
 361 {
 362         if (blob == state->mode_blob)
 363                 return 0;
 364
 365         drm_property_unreference_blob(state->mode_blob);
 366         state->mode_blob = NULL;
 367
 368         if (blob) {
 369                 if (blob->length != sizeof(struct drm_mode_modeinfo) ||
 370                     drm_mode_convert_umode(&state->mode,
 371                                            (const struct drm_mode_modeinfo *)
 372                                             blob->data))
 373                         return -EINVAL;
 374
 375                 state->mode_blob = drm_property_reference_blob(blob);
 376                 state->enable = true;
 377                 DRM_DEBUG_ATOMIC("Set [MODE:%s] for CRTC state %p\n",
 378                                  state->mode.name, state);
 379         } else {
 380                 memset(&state->mode, 0, sizeof(state->mode));
 381                 state->enable = false;
 382                 DRM_DEBUG_ATOMIC("Set [NOMODE] for CRTC state %p\n",
 383                                  state);
 384         }
 385
 386         return 0;
 387 }
 388 EXPORT_SYMBOL(drm_atomic_set_mode_prop_for_crtc);
 389
 390 /**
 391  * drm_atomic_crtc_set_property - set property on CRTC
 392  * @crtc: the drm CRTC to set a property on
 393  * @state: the state object to update with the new property value
 394  * @property: the property to set
 395  * @val: the new property value
 396  *
 397  * Use this instead of calling crtc->atomic_set_property directly.
 398  * This function handles generic/core properties and calls out to
 399  * driver's ->atomic_set_property() for driver properties.  To ensure
 400  * consistent behavior you must call this function rather than the
 401  * driver hook directly.
 402  *
 403  * RETURNS:
 404  * Zero on success, error code on failure
 405  */
 406 int drm_atomic_crtc_set_property(struct drm_crtc *crtc,
 407                 struct drm_crtc_state *state, struct drm_property *property,
 408                 uint64_t val)
 409 {
 410         struct drm_device *dev = crtc->dev;
 411         struct drm_mode_config *config = &dev->mode_config;
 412         int ret;
 413
 414         if (property == config->prop_active)
 415                 state->active = val;
 416         else if (property == config->prop_mode_id) {
 417                 struct drm_property_blob *mode =
 418                         drm_property_lookup_blob(dev, val);
 419                 ret = drm_atomic_set_mode_prop_for_crtc(state, mode);
 420                 drm_property_unreference_blob(mode);
 421                 return ret;
 422         }
 423         else if (crtc->funcs->atomic_set_property)
 424                 return crtc->funcs->atomic_set_property(crtc, state, property, val);
 425         else
 426                 return -EINVAL;
 427
 428         return 0;
 429 }
 430 EXPORT_SYMBOL(drm_atomic_crtc_set_property);
 431
 432 /**
 433  * drm_atomic_crtc_get_property - get property value from CRTC state
 434  * @crtc: the drm CRTC to set a property on
 435  * @state: the state object to get the property value from
 436  * @property: the property to set
 437  * @val: return location for the property value
 438  *
 439  * This function handles generic/core properties and calls out to
 440  * driver's ->atomic_get_property() for driver properties.  To ensure
 441  * consistent behavior you must call this function rather than the
 442  * driver hook directly.
 443  *
 444  * RETURNS:
 445  * Zero on success, error code on failure
 446  */
 447 static int
 448 drm_atomic_crtc_get_property(struct drm_crtc *crtc,
 449                 const struct drm_crtc_state *state,
 450                 struct drm_property *property, uint64_t *val)
 451 {
 452         struct drm_device *dev = crtc->dev;
 453         struct drm_mode_config *config = &dev->mode_config;
 454
 455         if (property == config->prop_active)
 456                 *val = state->active;
 457         else if (property == config->prop_mode_id)
 458                 *val = (state->mode_blob) ? state->mode_blob->base.id : 0;
 459         else if (crtc->funcs->atomic_get_property)
 460                 return crtc->funcs->atomic_get_property(crtc, state, property, val);
 461         else
 462                 return -EINVAL;
 463
 464         return 0;
 465 }
 466
 467 /**
 468  * drm_atomic_crtc_check - check crtc state
 469  * @crtc: crtc to check
 470  * @state: crtc state to check
 471  *
 472  * Provides core sanity checks for crtc state.
 473  *
 474  * RETURNS:
 475  * Zero on success, error code on failure
 476  */
 477 static int drm_atomic_crtc_check(struct drm_crtc *crtc,
 478                 struct drm_crtc_state *state)
 479 {
 480         /* NOTE: we explicitly don't enforce constraints such as primary
 481          * layer covering entire screen, since that is something we want
 482          * to allow (on hw that supports it).  For hw that does not, it
 483          * should be checked in driver's crtc->atomic_check() vfunc.
 484          *
 485          * TODO: Add generic modeset state checks once we support those.
 486          */
 487
 488         if (state->active && !state->enable) {
 489                 DRM_DEBUG_ATOMIC("[CRTC:%d] active without enabled\n",
 490                                  crtc->base.id);
 491                 return -EINVAL;
 492         }
 493
 494         /* The state->enable vs. state->mode_blob checks can be WARN_ON,
 495          * as this is a kernel-internal detail that userspace should never
 496          * be able to trigger. */
 497         if (drm_core_check_feature(crtc->dev, DRIVER_ATOMIC) &&
 498             WARN_ON(state->enable && !state->mode_blob)) {
 499                 DRM_DEBUG_ATOMIC("[CRTC:%d] enabled without mode blob\n",
 500                                  crtc->base.id);
 501                 return -EINVAL;
 502         }
 503
 504         if (drm_core_check_feature(crtc->dev, DRIVER_ATOMIC) &&
 505             WARN_ON(!state->enable && state->mode_blob)) {
 506                 DRM_DEBUG_ATOMIC("[CRTC:%d] disabled with mode blob\n",
 507                                  crtc->base.id);
 508                 return -EINVAL;
 509         }
 510
 511         return 0;
 512 }
 513
 514 /**
 515  * drm_atomic_get_plane_state - get plane state
 516  * @state: global atomic state object
 517  * @plane: plane to get state object for
 518  *
 519  * This function returns the plane state for the given plane, allocating it if
 520  * needed. It will also grab the relevant plane lock to make sure that the state
 521  * is consistent.
 522  *
 523  * Returns:
 524  *
 525  * Either the allocated state or the error code encoded into the pointer. When
 526  * the error is EDEADLK then the w/w mutex code has detected a deadlock and the
 527  * entire atomic sequence must be restarted. All other errors are fatal.
 528  */
 529 struct drm_plane_state *
 530 drm_atomic_get_plane_state(struct drm_atomic_state *state,
 531                           struct drm_plane *plane)
 532 {
 533         int ret, index = drm_plane_index(plane);
 534         struct drm_plane_state *plane_state;
 535
 536         plane_state = drm_atomic_get_existing_plane_state(state, plane);
 537         if (plane_state)
 538                 return plane_state;
 539
 540         ret = drm_modeset_lock(&plane->mutex, state->acquire_ctx);
 541         if (ret)
 542                 return ERR_PTR(ret);
 543
 544         plane_state = plane->funcs->atomic_duplicate_state(plane);
 545         if (!plane_state)
 546                 return ERR_PTR(-ENOMEM);
 547
 548         state->plane_states[index] = plane_state;
 549         state->planes[index] = plane;
 550         plane_state->state = state;
 551
 552         DRM_DEBUG_ATOMIC("Added [PLANE:%d] %p state to %p\n",
 553                          plane->base.id, plane_state, state);
 554
 555         if (plane_state->crtc) {
 556                 struct drm_crtc_state *crtc_state;
 557
 558                 crtc_state = drm_atomic_get_crtc_state(state,
 559                                                        plane_state->crtc);
 560                 if (IS_ERR(crtc_state))
 561                         return ERR_CAST(crtc_state);
 562         }
 563
 564         return plane_state;
 565 }
 566 EXPORT_SYMBOL(drm_atomic_get_plane_state);
 567
 568 /**
 569  * drm_atomic_plane_set_property - set property on plane
 570  * @plane: the drm plane to set a property on
 571  * @state: the state object to update with the new property value
 572  * @property: the property to set
 573  * @val: the new property value
 574  *
 575  * Use this instead of calling plane->atomic_set_property directly.
 576  * This function handles generic/core properties and calls out to
 577  * driver's ->atomic_set_property() for driver properties.  To ensure
 578  * consistent behavior you must call this function rather than the
 579  * driver hook directly.
 580  *
 581  * RETURNS:
 582  * Zero on success, error code on failure
 583  */
 584 int drm_atomic_plane_set_property(struct drm_plane *plane,
 585                 struct drm_plane_state *state, struct drm_property *property,
 586                 uint64_t val)
 587 {
 588         struct drm_device *dev = plane->dev;
 589         struct drm_mode_config *config = &dev->mode_config;
 590
 591         if (property == config->prop_fb_id) {
 592                 struct drm_framebuffer *fb = drm_framebuffer_lookup(dev, val);
 593                 drm_atomic_set_fb_for_plane(state, fb);
 594                 if (fb)
 595                         drm_framebuffer_unreference(fb);
 596         } else if (property == config->prop_crtc_id) {
 597                 struct drm_crtc *crtc = drm_crtc_find(dev, val);
 598                 return drm_atomic_set_crtc_for_plane(state, crtc);
 599         } else if (property == config->prop_crtc_x) {
 600                 state->crtc_x = U642I64(val);
 601         } else if (property == config->prop_crtc_y) {
 602                 state->crtc_y = U642I64(val);
 603         } else if (property == config->prop_crtc_w) {
 604                 state->crtc_w = val;
 605         } else if (property == config->prop_crtc_h) {
 606                 state->crtc_h = val;
 607         } else if (property == config->prop_src_x) {
 608                 state->src_x = val;
 609         } else if (property == config->prop_src_y) {
 610                 state->src_y = val;
 611         } else if (property == config->prop_src_w) {
 612                 state->src_w = val;
 613         } else if (property == config->prop_src_h) {
 614                 state->src_h = val;
 615         } else if (property == config->rotation_property) {
 616                 state->rotation = val;
 617         } else if (plane->funcs->atomic_set_property) {
 618                 return plane->funcs->atomic_set_property(plane, state,
 619                                 property, val);
 620         } else {
 621                 return -EINVAL;
 622         }
 623
 624         return 0;
 625 }
 626 EXPORT_SYMBOL(drm_atomic_plane_set_property);
 627
 628 /**
 629  * drm_atomic_plane_get_property - get property value from plane state
 630  * @plane: the drm plane to set a property on
 631  * @state: the state object to get the property value from
 632  * @property: the property to set
 633  * @val: return location for the property value
 634  *
 635  * This function handles generic/core properties and calls out to
 636  * driver's ->atomic_get_property() for driver properties.  To ensure
 637  * consistent behavior you must call this function rather than the
 638  * driver hook directly.
 639  *
 640  * RETURNS:
 641  * Zero on success, error code on failure
 642  */
 643 static int
 644 drm_atomic_plane_get_property(struct drm_plane *plane,
 645                 const struct drm_plane_state *state,
 646                 struct drm_property *property, uint64_t *val)
 647 {
 648         struct drm_device *dev = plane->dev;
 649         struct drm_mode_config *config = &dev->mode_config;
 650
 651         if (property == config->prop_fb_id) {
 652                 *val = (state->fb) ? state->fb->base.id : 0;
 653         } else if (property == config->prop_crtc_id) {
 654                 *val = (state->crtc) ? state->crtc->base.id : 0;
 655         } else if (property == config->prop_crtc_x) {
 656                 *val = I642U64(state->crtc_x);
 657         } else if (property == config->prop_crtc_y) {
 658                 *val = I642U64(state->crtc_y);
 659         } else if (property == config->prop_crtc_w) {
 660                 *val = state->crtc_w;
 661         } else if (property == config->prop_crtc_h) {
 662                 *val = state->crtc_h;
 663         } else if (property == config->prop_src_x) {
 664                 *val = state->src_x;
 665         } else if (property == config->prop_src_y) {
 666                 *val = state->src_y;
 667         } else if (property == config->prop_src_w) {
 668                 *val = state->src_w;
 669         } else if (property == config->prop_src_h) {
 670                 *val = state->src_h;
 671         } else if (property == config->rotation_property) {
 672                 *val = state->rotation;
 673         } else if (plane->funcs->atomic_get_property) {
 674                 return plane->funcs->atomic_get_property(plane, state, property, val);
 675         } else {
 676                 return -EINVAL;
 677         }
 678
 679         return 0;
 680 }
 681
 682 static bool
 683 plane_switching_crtc(struct drm_atomic_state *state,
 684                      struct drm_plane *plane,
 685                      struct drm_plane_state *plane_state)
 686 {
 687         if (!plane->state->crtc || !plane_state->crtc)
 688                 return false;
 689
 690         if (plane->state->crtc == plane_state->crtc)
 691                 return false;
 692
 693         /* This could be refined, but currently there's no helper or driver code
 694          * to implement direct switching of active planes nor userspace to take
 695          * advantage of more direct plane switching without the intermediate
 696          * full OFF state.
 697          */
 698         return true;
 699 }
 700
 701 /**
 702  * drm_atomic_plane_check - check plane state
 703  * @plane: plane to check
 704  * @state: plane state to check
 705  *
 706  * Provides core sanity checks for plane state.
 707  *
 708  * RETURNS:
 709  * Zero on success, error code on failure
 710  */
 711 static int drm_atomic_plane_check(struct drm_plane *plane,
 712                 struct drm_plane_state *state)
 713 {
 714         unsigned int fb_width, fb_height;
 715         int ret;
 716
 717         /* either *both* CRTC and FB must be set, or neither */
 718         if (WARN_ON(state->crtc && !state->fb)) {
 719                 DRM_DEBUG_ATOMIC("CRTC set but no FB\n");
 720                 return -EINVAL;
 721         } else if (WARN_ON(state->fb && !state->crtc)) {
 722                 DRM_DEBUG_ATOMIC("FB set but no CRTC\n");
 723                 return -EINVAL;
 724         }
 725
 726         /* if disabled, we don't care about the rest of the state: */
 727         if (!state->crtc)
 728                 return 0;
 729
 730         /* Check whether this plane is usable on this CRTC */
 731         if (!(plane->possible_crtcs & drm_crtc_mask(state->crtc))) {
 732                 DRM_DEBUG_ATOMIC("Invalid crtc for plane\n");
 733                 return -EINVAL;
 734         }
 735
 736         /* Check whether this plane supports the fb pixel format. */
 737         ret = drm_plane_check_pixel_format(plane, state->fb->pixel_format);
 738         if (ret) {
 739                 DRM_DEBUG_ATOMIC("Invalid pixel format %s\n",
 740                                  drm_get_format_name(state->fb->pixel_format));
 741                 return ret;
 742         }
 743
 744         /* Give drivers some help against integer overflows */
 745         if (state->crtc_w > INT_MAX ||
 746             state->crtc_x > INT_MAX - (int32_t) state->crtc_w ||
 747             state->crtc_h > INT_MAX ||
 748             state->crtc_y > INT_MAX - (int32_t) state->crtc_h) {
 749                 DRM_DEBUG_ATOMIC("Invalid CRTC coordinates %ux%u+%d+%d\n",
 750                                  state->crtc_w, state->crtc_h,
 751                                  state->crtc_x, state->crtc_y);
 752                 return -ERANGE;
 753         }
 754
 755         fb_width = state->fb->width << 16;
 756         fb_height = state->fb->height << 16;
 757
 758         /* Make sure source coordinates are inside the fb. */
 759         if (state->src_w > fb_width ||
 760             state->src_x > fb_width - state->src_w ||
 761             state->src_h > fb_height ||
 762             state->src_y > fb_height - state->src_h) {
 763                 DRM_DEBUG_ATOMIC("Invalid source coordinates "
 764                                  "%u.%06ux%u.%06u+%u.%06u+%u.%06u\n",
 765                                  state->src_w >> 16, ((state->src_w & 0xffff) * 15625) >> 10,
 766                                  state->src_h >> 16, ((state->src_h & 0xffff) * 15625) >> 10,
 767                                  state->src_x >> 16, ((state->src_x & 0xffff) * 15625) >> 10,
 768                                  state->src_y >> 16, ((state->src_y & 0xffff) * 15625) >> 10);
 769                 return -ENOSPC;
 770         }
 771
 772         if (plane_switching_crtc(state->state, plane, state)) {
 773                 DRM_DEBUG_ATOMIC("[PLANE:%d] switching CRTC directly\n",
 774                                  plane->base.id);
 775                 return -EINVAL;
 776         }
 777
 778         return 0;
 779 }
 780
 781 /**
 782  * drm_atomic_get_connector_state - get connector state
 783  * @state: global atomic state object
 784  * @connector: connector to get state object for
 785  *
 786  * This function returns the connector state for the given connector,
 787  * allocating it if needed. It will also grab the relevant connector lock to
 788  * make sure that the state is consistent.
 789  *
 790  * Returns:
 791  *
 792  * Either the allocated state or the error code encoded into the pointer. When
 793  * the error is EDEADLK then the w/w mutex code has detected a deadlock and the
 794  * entire atomic sequence must be restarted. All other errors are fatal.
 795  */
 796 struct drm_connector_state *
 797 drm_atomic_get_connector_state(struct drm_atomic_state *state,
 798                           struct drm_connector *connector)
 799 {
 800         int ret, index;
 801         struct drm_mode_config *config = &connector->dev->mode_config;
 802         struct drm_connector_state *connector_state;
 803
 804         ret = drm_modeset_lock(&config->connection_mutex, state->acquire_ctx);
 805         if (ret)
 806                 return ERR_PTR(ret);
 807
 808         index = drm_connector_index(connector);
 809
 810         /*
 811          * Construction of atomic state updates can race with a connector
 812          * hot-add which might overflow. In this case flip the table and just
 813          * restart the entire ioctl - no one is fast enough to livelock a cpu
 814          * with physical hotplug events anyway.
 815          *
 816          * Note that we only grab the indexes once we have the right lock to
 817          * prevent hotplug/unplugging of connectors. So removal is no problem,
 818          * at most the array is a bit too large.
 819          */
 820         if (index >= state->num_connector) {
 821                 DRM_DEBUG_ATOMIC("Hot-added connector would overflow state array, restarting\n");
 822                 return ERR_PTR(-EAGAIN);
 823         }
 824
 825         if (state->connector_states[index])
 826                 return state->connector_states[index];
 827
 828         connector_state = connector->funcs->atomic_duplicate_state(connector);
 829         if (!connector_state)
 830                 return ERR_PTR(-ENOMEM);
 831
 832         state->connector_states[index] = connector_state;
 833         state->connectors[index] = connector;
 834         connector_state->state = state;
 835
 836         DRM_DEBUG_ATOMIC("Added [CONNECTOR:%d] %p state to %p\n",
 837                          connector->base.id, connector_state, state);
 838
 839         if (connector_state->crtc) {
 840                 struct drm_crtc_state *crtc_state;
 841
 842                 crtc_state = drm_atomic_get_crtc_state(state,
 843                                                        connector_state->crtc);
 844                 if (IS_ERR(crtc_state))
 845                         return ERR_CAST(crtc_state);
 846         }
 847
 848         return connector_state;
 849 }
 850 EXPORT_SYMBOL(drm_atomic_get_connector_state);
 851
 852 /**
 853  * drm_atomic_connector_set_property - set property on connector.
 854  * @connector: the drm connector to set a property on
 855  * @state: the state object to update with the new property value
 856  * @property: the property to set
 857  * @val: the new property value
 858  *
 859  * Use this instead of calling connector->atomic_set_property directly.
 860  * This function handles generic/core properties and calls out to
 861  * driver's ->atomic_set_property() for driver properties.  To ensure
 862  * consistent behavior you must call this function rather than the
 863  * driver hook directly.
 864  *
 865  * RETURNS:
 866  * Zero on success, error code on failure
 867  */
 868 int drm_atomic_connector_set_property(struct drm_connector *connector,
 869                 struct drm_connector_state *state, struct drm_property *property,
 870                 uint64_t val)
 871 {
 872         struct drm_device *dev = connector->dev;
 873         struct drm_mode_config *config = &dev->mode_config;
 874
 875         if (property == config->prop_crtc_id) {
 876                 struct drm_crtc *crtc = drm_crtc_find(dev, val);
 877                 return drm_atomic_set_crtc_for_connector(state, crtc);
 878         } else if (property == config->dpms_property) {
 879                 /* setting DPMS property requires special handling, which
 880                  * is done in legacy setprop path for us.  Disallow (for
 881                  * now?) atomic writes to DPMS property:
 882                  */
 883                 return -EINVAL;
 884         } else if (connector->funcs->atomic_set_property) {
 885                 return connector->funcs->atomic_set_property(connector,
 886                                 state, property, val);
 887         } else {
 888                 return -EINVAL;
 889         }
 890 }
 891 EXPORT_SYMBOL(drm_atomic_connector_set_property);
 892
 893 /**
 894  * drm_atomic_connector_get_property - get property value from connector state
 895  * @connector: the drm connector to set a property on
 896  * @state: the state object to get the property value from
 897  * @property: the property to set
 898  * @val: return location for the property value
 899  *
 900  * This function handles generic/core properties and calls out to
 901  * driver's ->atomic_get_property() for driver properties.  To ensure
 902  * consistent behavior you must call this function rather than the
 903  * driver hook directly.
 904  *
 905  * RETURNS:
 906  * Zero on success, error code on failure
 907  */
 908 static int
 909 drm_atomic_connector_get_property(struct drm_connector *connector,
 910                 const struct drm_connector_state *state,
 911                 struct drm_property *property, uint64_t *val)
 912 {
 913         struct drm_device *dev = connector->dev;
 914         struct drm_mode_config *config = &dev->mode_config;
 915
 916         if (property == config->prop_crtc_id) {
 917                 *val = (state->crtc) ? state->crtc->base.id : 0;
 918         } else if (property == config->dpms_property) {
 919                 *val = connector->dpms;
 920         } else if (connector->funcs->atomic_get_property) {
 921                 return connector->funcs->atomic_get_property(connector,
 922                                 state, property, val);
 923         } else {
 924                 return -EINVAL;
 925         }
 926
 927         return 0;
 928 }
 929
 930 int drm_atomic_get_property(struct drm_mode_object *obj,
 931                 struct drm_property *property, uint64_t *val)
 932 {
 933         struct drm_device *dev = property->dev;
 934         int ret;
 935
 936         switch (obj->type) {
 937         case DRM_MODE_OBJECT_CONNECTOR: {
 938                 struct drm_connector *connector = obj_to_connector(obj);
 939                 WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
 940                 ret = drm_atomic_connector_get_property(connector,
 941                                 connector->state, property, val);
 942                 break;
 943         }
 944         case DRM_MODE_OBJECT_CRTC: {
 945                 struct drm_crtc *crtc = obj_to_crtc(obj);
 946                 WARN_ON(!drm_modeset_is_locked(&crtc->mutex));
 947                 ret = drm_atomic_crtc_get_property(crtc,
 948                                 crtc->state, property, val);
 949                 break;
 950         }
 951         case DRM_MODE_OBJECT_PLANE: {
 952                 struct drm_plane *plane = obj_to_plane(obj);
 953                 WARN_ON(!drm_modeset_is_locked(&plane->mutex));
 954                 ret = drm_atomic_plane_get_property(plane,
 955                                 plane->state, property, val);
 956                 break;
 957         }
 958         default:
 959                 ret = -EINVAL;
 960                 break;
 961         }
 962
 963         return ret;
 964 }
 965
 966 /**
 967  * drm_atomic_set_crtc_for_plane - set crtc for plane
 968  * @plane_state: the plane whose incoming state to update
 969  * @crtc: crtc to use for the plane
 970  *
 971  * Changing the assigned crtc for a plane requires us to grab the lock and state
 972  * for the new crtc, as needed. This function takes care of all these details
 973  * besides updating the pointer in the state object itself.
 974  *
 975  * Returns:
 976  * 0 on success or can fail with -EDEADLK or -ENOMEM. When the error is EDEADLK
 977  * then the w/w mutex code has detected a deadlock and the entire atomic
 978  * sequence must be restarted. All other errors are fatal.
 979  */
 980 int
 981 drm_atomic_set_crtc_for_plane(struct drm_plane_state *plane_state,
 982                               struct drm_crtc *crtc)
 983 {
 984         struct drm_plane *plane = plane_state->plane;
 985         struct drm_crtc_state *crtc_state;
 986
 987         if (plane_state->crtc) {
 988                 crtc_state = drm_atomic_get_crtc_state(plane_state->state,
 989                                                        plane_state->crtc);
 990                 if (WARN_ON(IS_ERR(crtc_state)))
 991                         return PTR_ERR(crtc_state);
 992
 993                 crtc_state->plane_mask &= ~(1 << drm_plane_index(plane));
 994         }
 995
 996         plane_state->crtc = crtc;
 997
 998         if (crtc) {
 999                 crtc_state = drm_atomic_get_crtc_state(plane_state->state,
1000                                                        crtc);
1001                 if (IS_ERR(crtc_state))
1002                         return PTR_ERR(crtc_state);
1003                 crtc_state->plane_mask |= (1 << drm_plane_index(plane));
1004         }
1005
1006         if (crtc)
1007                 DRM_DEBUG_ATOMIC("Link plane state %p to [CRTC:%d]\n",
1008                                  plane_state, crtc->base.id);
1009         else
1010                 DRM_DEBUG_ATOMIC("Link plane state %p to [NOCRTC]\n",
1011                                  plane_state);
1012
1013         return 0;
1014 }
1015 EXPORT_SYMBOL(drm_atomic_set_crtc_for_plane);
1016
1017 /**
1018  * drm_atomic_set_fb_for_plane - set framebuffer for plane
1019  * @plane_state: atomic state object for the plane
1020  * @fb: fb to use for the plane
1021  *
1022  * Changing the assigned framebuffer for a plane requires us to grab a reference
1023  * to the new fb and drop the reference to the old fb, if there is one. This
1024  * function takes care of all these details besides updating the pointer in the
1025  * state object itself.
1026  */
1027 void
1028 drm_atomic_set_fb_for_plane(struct drm_plane_state *plane_state,
1029                             struct drm_framebuffer *fb)
1030 {
1031         if (plane_state->fb)
1032                 drm_framebuffer_unreference(plane_state->fb);
1033         if (fb)
1034                 drm_framebuffer_reference(fb);
1035         plane_state->fb = fb;
1036
1037         if (fb)
1038                 DRM_DEBUG_ATOMIC("Set [FB:%d] for plane state %p\n",
1039                                  fb->base.id, plane_state);
1040         else
1041                 DRM_DEBUG_ATOMIC("Set [NOFB] for plane state %p\n",
1042                                  plane_state);
1043 }
1044 EXPORT_SYMBOL(drm_atomic_set_fb_for_plane);
1045
1046 /**
1047  * drm_atomic_set_crtc_for_connector - set crtc for connector
1048  * @conn_state: atomic state object for the connector
1049  * @crtc: crtc to use for the connector
1050  *
1051  * Changing the assigned crtc for a connector requires us to grab the lock and
1052  * state for the new crtc, as needed. This function takes care of all these
1053  * details besides updating the pointer in the state object itself.
1054  *
1055  * Returns:
1056  * 0 on success or can fail with -EDEADLK or -ENOMEM. When the error is EDEADLK
1057  * then the w/w mutex code has detected a deadlock and the entire atomic
1058  * sequence must be restarted. All other errors are fatal.
1059  */
1060 int
1061 drm_atomic_set_crtc_for_connector(struct drm_connector_state *conn_state,
1062                                   struct drm_crtc *crtc)
1063 {
1064         struct drm_crtc_state *crtc_state;
1065
1066         if (crtc) {
1067                 crtc_state = drm_atomic_get_crtc_state(conn_state->state, crtc);
1068                 if (IS_ERR(crtc_state))
1069                         return PTR_ERR(crtc_state);
1070         }
1071
1072         conn_state->crtc = crtc;
1073
1074         if (crtc)
1075                 DRM_DEBUG_ATOMIC("Link connector state %p to [CRTC:%d]\n",
1076                                  conn_state, crtc->base.id);
1077         else
1078                 DRM_DEBUG_ATOMIC("Link connector state %p to [NOCRTC]\n",
1079                                  conn_state);
1080
1081         return 0;
1082 }
1083 EXPORT_SYMBOL(drm_atomic_set_crtc_for_connector);
1084
1085 /**
1086  * drm_atomic_add_affected_connectors - add connectors for crtc
1087  * @state: atomic state
1088  * @crtc: DRM crtc
1089  *
1090  * This function walks the current configuration and adds all connectors
1091  * currently using @crtc to the atomic configuration @state. Note that this
1092  * function must acquire the connection mutex. This can potentially cause
1093  * unneeded seralization if the update is just for the planes on one crtc. Hence
1094  * drivers and helpers should only call this when really needed (e.g. when a
1095  * full modeset needs to happen due to some change).
1096  *
1097  * Returns:
1098  * 0 on success or can fail with -EDEADLK or -ENOMEM. When the error is EDEADLK
1099  * then the w/w mutex code has detected a deadlock and the entire atomic
1100  * sequence must be restarted. All other errors are fatal.
1101  */
1102 int
1103 drm_atomic_add_affected_connectors(struct drm_atomic_state *state,
1104                                    struct drm_crtc *crtc)
1105 {
1106         struct drm_mode_config *config = &state->dev->mode_config;
1107         struct drm_connector *connector;
1108         struct drm_connector_state *conn_state;
1109         int ret;
1110
1111         ret = drm_modeset_lock(&config->connection_mutex, state->acquire_ctx);
1112         if (ret)
1113                 return ret;
1114
1115         DRM_DEBUG_ATOMIC("Adding all current connectors for [CRTC:%d] to %p\n",
1116                          crtc->base.id, state);
1117
1118         /*
1119          * Changed connectors are already in @state, so only need to look at the
1120          * current configuration.
1121          */
1122         drm_for_each_connector(connector, state->dev) {
1123                 if (connector->state->crtc != crtc)
1124                         continue;
1125
1126                 conn_state = drm_atomic_get_connector_state(state, connector);
1127                 if (IS_ERR(conn_state))
1128                         return PTR_ERR(conn_state);
1129         }
1130
1131         return 0;
1132 }
1133 EXPORT_SYMBOL(drm_atomic_add_affected_connectors);
1134
1135 /**
1136  * drm_atomic_add_affected_planes - add planes for crtc
1137  * @state: atomic state
1138  * @crtc: DRM crtc
1139  *
1140  * This function walks the current configuration and adds all planes
1141  * currently used by @crtc to the atomic configuration @state. This is useful
1142  * when an atomic commit also needs to check all currently enabled plane on
1143  * @crtc, e.g. when changing the mode. It's also useful when re-enabling a CRTC
1144  * to avoid special code to force-enable all planes.
1145  *
1146  * Since acquiring a plane state will always also acquire the w/w mutex of the
1147  * current CRTC for that plane (if there is any) adding all the plane states for
1148  * a CRTC will not reduce parallism of atomic updates.
1149  *
1150  * Returns:
1151  * 0 on success or can fail with -EDEADLK or -ENOMEM. When the error is EDEADLK
1152  * then the w/w mutex code has detected a deadlock and the entire atomic
1153  * sequence must be restarted. All other errors are fatal.
1154  */
1155 int
1156 drm_atomic_add_affected_planes(struct drm_atomic_state *state,
1157                                struct drm_crtc *crtc)
1158 {
1159         struct drm_plane *plane;
1160
1161         WARN_ON(!drm_atomic_get_existing_crtc_state(state, crtc));
1162
1163         drm_for_each_plane_mask(plane, state->dev, crtc->state->plane_mask) {
1164                 struct drm_plane_state *plane_state =
1165                         drm_atomic_get_plane_state(state, plane);
1166
1167                 if (IS_ERR(plane_state))
1168                         return PTR_ERR(plane_state);
1169         }
1170         return 0;
1171 }
1172 EXPORT_SYMBOL(drm_atomic_add_affected_planes);
1173
1174 /**
1175  * drm_atomic_connectors_for_crtc - count number of connected outputs
1176  * @state: atomic state
1177  * @crtc: DRM crtc
1178  *
1179  * This function counts all connectors which will be connected to @crtc
1180  * according to @state. Useful to recompute the enable state for @crtc.
1181  */
1182 int
1183 drm_atomic_connectors_for_crtc(struct drm_atomic_state *state,
1184                                struct drm_crtc *crtc)
1185 {
1186         struct drm_connector *connector;
1187         struct drm_connector_state *conn_state;
1188
1189         int i, num_connected_connectors = 0;
1190
1191         for_each_connector_in_state(state, connector, conn_state, i) {
1192                 if (conn_state->crtc == crtc)
1193                         num_connected_connectors++;
1194         }
1195
1196         DRM_DEBUG_ATOMIC("State %p has %i connectors for [CRTC:%d]\n",
1197                          state, num_connected_connectors, crtc->base.id);
1198
1199         return num_connected_connectors;
1200 }
1201 EXPORT_SYMBOL(drm_atomic_connectors_for_crtc);
1202
1203 /**
1204  * drm_atomic_legacy_backoff - locking backoff for legacy ioctls
1205  * @state: atomic state
1206  *
1207  * This function should be used by legacy entry points which don't understand
1208  * -EDEADLK semantics. For simplicity this one will grab all modeset locks after
1209  * the slowpath completed.
1210  */
1211 void drm_atomic_legacy_backoff(struct drm_atomic_state *state)
1212 {
1213         int ret;
1214
1215 retry:
1216         drm_modeset_backoff(state->acquire_ctx);
1217
1218         ret = drm_modeset_lock_all_ctx(state->dev, state->acquire_ctx);
1219         if (ret)
1220                 goto retry;
1221 }
1222 EXPORT_SYMBOL(drm_atomic_legacy_backoff);
1223
1224 /**
1225  * drm_atomic_check_only - check whether a given config would work
1226  * @state: atomic configuration to check
1227  *
1228  * Note that this function can return -EDEADLK if the driver needed to acquire
1229  * more locks but encountered a deadlock. The caller must then do the usual w/w
1230  * backoff dance and restart. All other errors are fatal.
1231  *
1232  * Returns:
1233  * 0 on success, negative error code on failure.
1234  */
1235 int drm_atomic_check_only(struct drm_atomic_state *state)
1236 {
1237         struct drm_device *dev = state->dev;
1238         struct drm_mode_config *config = &dev->mode_config;
1239         struct drm_plane *plane;
1240         struct drm_plane_state *plane_state;
1241         struct drm_crtc *crtc;
1242         struct drm_crtc_state *crtc_state;
1243         int i, ret = 0;
1244
1245         DRM_DEBUG_ATOMIC("checking %p\n", state);
1246
1247         for_each_plane_in_state(state, plane, plane_state, i) {
1248                 ret = drm_atomic_plane_check(plane, plane_state);
1249                 if (ret) {
1250                         DRM_DEBUG_ATOMIC("[PLANE:%d] atomic core check failed\n",
1251                                          plane->base.id);
1252                         return ret;
1253                 }
1254         }
1255
1256         for_each_crtc_in_state(state, crtc, crtc_state, i) {
1257                 ret = drm_atomic_crtc_check(crtc, crtc_state);
1258                 if (ret) {
1259                         DRM_DEBUG_ATOMIC("[CRTC:%d] atomic core check failed\n",
1260                                          crtc->base.id);
1261                         return ret;
1262                 }
1263         }
1264
1265         if (config->funcs->atomic_check)
1266                 ret = config->funcs->atomic_check(state->dev, state);
1267
1268         if (!state->allow_modeset) {
1269                 for_each_crtc_in_state(state, crtc, crtc_state, i) {
1270                         if (drm_atomic_crtc_needs_modeset(crtc_state)) {
1271                                 DRM_DEBUG_ATOMIC("[CRTC:%d] requires full modeset\n",
1272                                                  crtc->base.id);
1273                                 return -EINVAL;
1274                         }
1275                 }
1276         }
1277
1278         return ret;
1279 }
1280 EXPORT_SYMBOL(drm_atomic_check_only);
1281
1282 /**
1283  * drm_atomic_commit - commit configuration atomically
1284  * @state: atomic configuration to check
1285  *
1286  * Note that this function can return -EDEADLK if the driver needed to acquire
1287  * more locks but encountered a deadlock. The caller must then do the usual w/w
1288  * backoff dance and restart. All other errors are fatal.
1289  *
1290  * Also note that on successful execution ownership of @state is transferred
1291  * from the caller of this function to the function itself. The caller must not
1292  * free or in any other way access @state. If the function fails then the caller
1293  * must clean up @state itself.
1294  *
1295  * Returns:
1296  * 0 on success, negative error code on failure.
1297  */
1298 int drm_atomic_commit(struct drm_atomic_state *state)
1299 {
1300         struct drm_mode_config *config = &state->dev->mode_config;
1301         int ret;
1302
1303         ret = drm_atomic_check_only(state);
1304         if (ret)
1305                 return ret;
1306
1307         DRM_DEBUG_ATOMIC("commiting %p\n", state);
1308
1309         return config->funcs->atomic_commit(state->dev, state, false);
1310 }
1311 EXPORT_SYMBOL(drm_atomic_commit);
1312
1313 /**
1314  * drm_atomic_async_commit - atomic&async configuration commit
1315  * @state: atomic configuration to check
1316  *
1317  * Note that this function can return -EDEADLK if the driver needed to acquire
1318  * more locks but encountered a deadlock. The caller must then do the usual w/w
1319  * backoff dance and restart. All other errors are fatal.
1320  *
1321  * Also note that on successful execution ownership of @state is transferred
1322  * from the caller of this function to the function itself. The caller must not
1323  * free or in any other way access @state. If the function fails then the caller
1324  * must clean up @state itself.
1325  *
1326  * Returns:
1327  * 0 on success, negative error code on failure.
1328  */
1329 int drm_atomic_async_commit(struct drm_atomic_state *state)
1330 {
1331         struct drm_mode_config *config = &state->dev->mode_config;
1332         int ret;
1333
1334         ret = drm_atomic_check_only(state);
1335         if (ret)
1336                 return ret;
1337
1338         DRM_DEBUG_ATOMIC("commiting %p asynchronously\n", state);
1339
1340         return config->funcs->atomic_commit(state->dev, state, true);
1341 }
1342 EXPORT_SYMBOL(drm_atomic_async_commit);
1343
1344 /*
1345  * The big monstor ioctl
1346  */
1347
1348 static struct drm_pending_vblank_event *create_vblank_event(
1349                 struct drm_device *dev, struct drm_file *file_priv, uint64_t user_data)
1350 {
1351         struct drm_pending_vblank_event *e = NULL;
1352         unsigned long flags;
1353
1354         spin_lock_irqsave(&dev->event_lock, flags);
1355         if (file_priv->event_space < sizeof e->event) {
1356                 spin_unlock_irqrestore(&dev->event_lock, flags);
1357                 goto out;
1358         }
1359         file_priv->event_space -= sizeof e->event;
1360         spin_unlock_irqrestore(&dev->event_lock, flags);
1361
1362         e = kzalloc(sizeof *e, GFP_KERNEL);
1363         if (e == NULL) {
1364                 spin_lock_irqsave(&dev->event_lock, flags);
1365                 file_priv->event_space += sizeof e->event;
1366                 spin_unlock_irqrestore(&dev->event_lock, flags);
1367                 goto out;
1368         }
1369
1370         e->event.base.type = DRM_EVENT_FLIP_COMPLETE;
1371         e->event.base.length = sizeof e->event;
1372         e->event.user_data = user_data;
1373         e->base.event = &e->event.base;
1374         e->base.file_priv = file_priv;
1375         e->base.destroy = (void (*) (struct drm_pending_event *)) kfree;
1376
1377 out:
1378         return e;
1379 }
1380
1381 static void destroy_vblank_event(struct drm_device *dev,
1382                 struct drm_file *file_priv, struct drm_pending_vblank_event *e)
1383 {
1384         unsigned long flags;
1385
1386         spin_lock_irqsave(&dev->event_lock, flags);
1387         file_priv->event_space += sizeof e->event;
1388         spin_unlock_irqrestore(&dev->event_lock, flags);
1389         kfree(e);
1390 }
1391
1392 static int atomic_set_prop(struct drm_atomic_state *state,
1393                 struct drm_mode_object *obj, struct drm_property *prop,
1394                 uint64_t prop_value)
1395 {
1396         struct drm_mode_object *ref;
1397         int ret;
1398
1399         if (!drm_property_change_valid_get(prop, prop_value, &ref))
1400                 return -EINVAL;
1401
1402         switch (obj->type) {
1403         case DRM_MODE_OBJECT_CONNECTOR: {
1404                 struct drm_connector *connector = obj_to_connector(obj);
1405                 struct drm_connector_state *connector_state;
1406
1407                 connector_state = drm_atomic_get_connector_state(state, connector);
1408                 if (IS_ERR(connector_state)) {
1409                         ret = PTR_ERR(connector_state);
1410                         break;
1411                 }
1412
1413                 ret = drm_atomic_connector_set_property(connector,
1414                                 connector_state, prop, prop_value);
1415                 break;
1416         }
1417         case DRM_MODE_OBJECT_CRTC: {
1418                 struct drm_crtc *crtc = obj_to_crtc(obj);
1419                 struct drm_crtc_state *crtc_state;
1420
1421                 crtc_state = drm_atomic_get_crtc_state(state, crtc);
1422                 if (IS_ERR(crtc_state)) {
1423                         ret = PTR_ERR(crtc_state);
1424                         break;
1425                 }
1426
1427                 ret = drm_atomic_crtc_set_property(crtc,
1428                                 crtc_state, prop, prop_value);
1429                 break;
1430         }
1431         case DRM_MODE_OBJECT_PLANE: {
1432                 struct drm_plane *plane = obj_to_plane(obj);
1433                 struct drm_plane_state *plane_state;
1434
1435                 plane_state = drm_atomic_get_plane_state(state, plane);
1436                 if (IS_ERR(plane_state)) {
1437                         ret = PTR_ERR(plane_state);
1438                         break;
1439                 }
1440
1441                 ret = drm_atomic_plane_set_property(plane,
1442                                 plane_state, prop, prop_value);
1443                 break;
1444         }
1445         default:
1446                 ret = -EINVAL;
1447                 break;
1448         }
1449
1450         drm_property_change_valid_put(prop, ref);
1451         return ret;
1452 }
1453
1454 /**
1455  * drm_atomic_clean_old_fb -- Unset old_fb pointers and set plane->fb pointers.
1456  *
1457  * @dev: drm device to check.
1458  * @plane_mask: plane mask for planes that were updated.
1459  * @ret: return value, can be -EDEADLK for a retry.
1460  *
1461  * Before doing an update plane->old_fb is set to plane->fb,
1462  * but before dropping the locks old_fb needs to be set to NULL
1463  * and plane->fb updated. This is a common operation for each
1464  * atomic update, so this call is split off as a helper.
1465  */
1466 void drm_atomic_clean_old_fb(struct drm_device *dev,
1467                              unsigned plane_mask,
1468                              int ret)
1469 {
1470         struct drm_plane *plane;
1471
1472         /* if succeeded, fixup legacy plane crtc/fb ptrs before dropping
1473          * locks (ie. while it is still safe to deref plane->state).  We
1474          * need to do this here because the driver entry points cannot
1475          * distinguish between legacy and atomic ioctls.
1476          */
1477         drm_for_each_plane_mask(plane, dev, plane_mask) {
1478                 if (ret == 0) {
1479                         struct drm_framebuffer *new_fb = plane->state->fb;
1480                         if (new_fb)
1481                                 drm_framebuffer_reference(new_fb);
1482                         plane->fb = new_fb;
1483                         plane->crtc = plane->state->crtc;
1484
1485                         if (plane->old_fb)
1486                                 drm_framebuffer_unreference(plane->old_fb);
1487                 }
1488                 plane->old_fb = NULL;
1489         }
1490 }
1491 EXPORT_SYMBOL(drm_atomic_clean_old_fb);
1492
1493 int drm_mode_atomic_ioctl(struct drm_device *dev,
1494                           void *data, struct drm_file *file_priv)
1495 {
1496         struct drm_mode_atomic *arg = data;
1497         uint32_t __user *objs_ptr = (uint32_t __user *)(unsigned long)(arg->objs_ptr);
1498         uint32_t __user *count_props_ptr = (uint32_t __user *)(unsigned long)(arg->count_props_ptr);
1499         uint32_t __user *props_ptr = (uint32_t __user *)(unsigned long)(arg->props_ptr);
1500         uint64_t __user *prop_values_ptr = (uint64_t __user *)(unsigned long)(arg->prop_values_ptr);
1501         unsigned int copied_objs, copied_props;
1502         struct drm_atomic_state *state;
1503         struct drm_modeset_acquire_ctx ctx;
1504         struct drm_plane *plane;
1505         struct drm_crtc *crtc;
1506         struct drm_crtc_state *crtc_state;
1507         unsigned plane_mask;
1508         int ret = 0;
1509         unsigned int i, j;
1510
1511         /* disallow for drivers not supporting atomic: */
1512         if (!drm_core_check_feature(dev, DRIVER_ATOMIC))
1513                 return -EINVAL;
1514
1515         /* disallow for userspace that has not enabled atomic cap (even
1516          * though this may be a bit overkill, since legacy userspace
1517          * wouldn't know how to call this ioctl)
1518          */
1519         if (!file_priv->atomic)
1520                 return -EINVAL;
1521
1522         if (arg->flags & ~DRM_MODE_ATOMIC_FLAGS)
1523                 return -EINVAL;
1524
1525         if (arg->reserved)
1526                 return -EINVAL;
1527
1528         if ((arg->flags & DRM_MODE_PAGE_FLIP_ASYNC) &&
1529                         !dev->mode_config.async_page_flip)
1530                 return -EINVAL;
1531
1532         /* can't test and expect an event at the same time. */
1533         if ((arg->flags & DRM_MODE_ATOMIC_TEST_ONLY) &&
1534                         (arg->flags & DRM_MODE_PAGE_FLIP_EVENT))
1535                 return -EINVAL;
1536
1537         drm_modeset_acquire_init(&ctx, 0);
1538
1539         state = drm_atomic_state_alloc(dev);
1540         if (!state)
1541                 return -ENOMEM;
1542
1543         state->acquire_ctx = &ctx;
1544         state->allow_modeset = !!(arg->flags & DRM_MODE_ATOMIC_ALLOW_MODESET);
1545
1546 retry:
1547         plane_mask = 0;
1548         copied_objs = 0;
1549         copied_props = 0;
1550
1551         for (i = 0; i < arg->count_objs; i++) {
1552                 uint32_t obj_id, count_props;
1553                 struct drm_mode_object *obj;
1554
1555                 if (get_user(obj_id, objs_ptr + copied_objs)) {
1556                         ret = -EFAULT;
1557                         goto out;
1558                 }
1559
1560                 obj = drm_mode_object_find(dev, obj_id, DRM_MODE_OBJECT_ANY);
1561                 if (!obj || !obj->properties) {
1562                         ret = -ENOENT;
1563                         goto out;
1564                 }
1565
1566                 if (get_user(count_props, count_props_ptr + copied_objs)) {
1567                         ret = -EFAULT;
1568                         goto out;
1569                 }
1570
1571                 copied_objs++;
1572
1573                 for (j = 0; j < count_props; j++) {
1574                         uint32_t prop_id;
1575                         uint64_t prop_value;
1576                         struct drm_property *prop;
1577
1578                         if (get_user(prop_id, props_ptr + copied_props)) {
1579                                 ret = -EFAULT;
1580                                 goto out;
1581                         }
1582
1583                         prop = drm_property_find(dev, prop_id);
1584                         if (!prop) {
1585                                 ret = -ENOENT;
1586                                 goto out;
1587                         }
1588
1589                         if (copy_from_user(&prop_value,
1590                                            prop_values_ptr + copied_props,
1591                                            sizeof(prop_value))) {
1592                                 ret = -EFAULT;
1593                                 goto out;
1594                         }
1595
1596                         ret = atomic_set_prop(state, obj, prop, prop_value);
1597                         if (ret)
1598                                 goto out;
1599
1600                         copied_props++;
1601                 }
1602
1603                 if (obj->type == DRM_MODE_OBJECT_PLANE && count_props &&
1604                     !(arg->flags & DRM_MODE_ATOMIC_TEST_ONLY)) {
1605                         plane = obj_to_plane(obj);
1606                         plane_mask |= (1 << drm_plane_index(plane));
1607                         plane->old_fb = plane->fb;
1608                 }
1609         }
1610
1611         if (arg->flags & DRM_MODE_PAGE_FLIP_EVENT) {
1612                 for_each_crtc_in_state(state, crtc, crtc_state, i) {
1613                         struct drm_pending_vblank_event *e;
1614
1615                         e = create_vblank_event(dev, file_priv, arg->user_data);
1616                         if (!e) {
1617                                 ret = -ENOMEM;
1618                                 goto out;
1619                         }
1620
1621                         crtc_state->event = e;
1622                 }
1623         }
1624
1625         if (arg->flags & DRM_MODE_ATOMIC_TEST_ONLY) {
1626                 /*
1627                  * Unlike commit, check_only does not clean up state.
1628                  * Below we call drm_atomic_state_free for it.
1629                  */
1630                 ret = drm_atomic_check_only(state);
1631         } else if (arg->flags & DRM_MODE_ATOMIC_NONBLOCK) {
1632                 ret = drm_atomic_async_commit(state);
1633         } else {
1634                 ret = drm_atomic_commit(state);
1635         }
1636
1637 out:
1638         drm_atomic_clean_old_fb(dev, plane_mask, ret);
1639
1640         if (ret && arg->flags & DRM_MODE_PAGE_FLIP_EVENT) {
1641                 /*
1642                  * TEST_ONLY and PAGE_FLIP_EVENT are mutually exclusive,
1643                  * if they weren't, this code should be called on success
1644                  * for TEST_ONLY too.
1645                  */
1646
1647                 for_each_crtc_in_state(state, crtc, crtc_state, i) {
1648                         if (!crtc_state->event)
1649                                 continue;
1650
1651                         destroy_vblank_event(dev, file_priv,
1652                                              crtc_state->event);
1653                 }
1654         }
1655
1656         if (ret == -EDEADLK) {
1657                 drm_atomic_state_clear(state);
1658                 drm_modeset_backoff(&ctx);
1659                 goto retry;
1660         }
1661
1662         if (ret || arg->flags & DRM_MODE_ATOMIC_TEST_ONLY)
1663                 drm_atomic_state_free(state);
1664
1665         drm_modeset_drop_locks(&ctx);
1666         drm_modeset_acquire_fini(&ctx);
1667
1668         return ret;
1669 }