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:%s] %p state to %p\n",
 292                          crtc->base.id, crtc->name, 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:%s] active without enabled\n",
 490                                  crtc->base.id, crtc->name);
 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:%s] enabled without mode blob\n",
 500                                  crtc->base.id, crtc->name);
 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:%s] disabled with mode blob\n",
 507                                  crtc->base.id, crtc->name);
 508                 return -EINVAL;
 509         }
 510
 511         /*
 512          * Reject event generation for when a CRTC is off and stays off.
 513          * It wouldn't be hard to implement this, but userspace has a track
 514          * record of happily burning through 100% cpu (or worse, crash) when the
 515          * display pipe is suspended. To avoid all that fun just reject updates
 516          * that ask for events since likely that indicates a bug in the
 517          * compositor's drawing loop. This is consistent with the vblank IOCTL
 518          * and legacy page_flip IOCTL which also reject service on a disabled
 519          * pipe.
 520          */
 521         if (state->event && !state->active && !crtc->state->active) {
 522                 DRM_DEBUG_ATOMIC("[CRTC:%d] requesting event but off\n",
 523                                  crtc->base.id);
 524                 return -EINVAL;
 525         }
 526
 527         return 0;
 528 }
 529
 530 /**
 531  * drm_atomic_get_plane_state - get plane state
 532  * @state: global atomic state object
 533  * @plane: plane to get state object for
 534  *
 535  * This function returns the plane state for the given plane, allocating it if
 536  * needed. It will also grab the relevant plane lock to make sure that the state
 537  * is consistent.
 538  *
 539  * Returns:
 540  *
 541  * Either the allocated state or the error code encoded into the pointer. When
 542  * the error is EDEADLK then the w/w mutex code has detected a deadlock and the
 543  * entire atomic sequence must be restarted. All other errors are fatal.
 544  */
 545 struct drm_plane_state *
 546 drm_atomic_get_plane_state(struct drm_atomic_state *state,
 547                           struct drm_plane *plane)
 548 {
 549         int ret, index = drm_plane_index(plane);
 550         struct drm_plane_state *plane_state;
 551
 552         plane_state = drm_atomic_get_existing_plane_state(state, plane);
 553         if (plane_state)
 554                 return plane_state;
 555
 556         ret = drm_modeset_lock(&plane->mutex, state->acquire_ctx);
 557         if (ret)
 558                 return ERR_PTR(ret);
 559
 560         plane_state = plane->funcs->atomic_duplicate_state(plane);
 561         if (!plane_state)
 562                 return ERR_PTR(-ENOMEM);
 563
 564         state->plane_states[index] = plane_state;
 565         state->planes[index] = plane;
 566         plane_state->state = state;
 567
 568         DRM_DEBUG_ATOMIC("Added [PLANE:%d:%s] %p state to %p\n",
 569                          plane->base.id, plane->name, plane_state, state);
 570
 571         if (plane_state->crtc) {
 572                 struct drm_crtc_state *crtc_state;
 573
 574                 crtc_state = drm_atomic_get_crtc_state(state,
 575                                                        plane_state->crtc);
 576                 if (IS_ERR(crtc_state))
 577                         return ERR_CAST(crtc_state);
 578         }
 579
 580         return plane_state;
 581 }
 582 EXPORT_SYMBOL(drm_atomic_get_plane_state);
 583
 584 /**
 585  * drm_atomic_plane_set_property - set property on plane
 586  * @plane: the drm plane to set a property on
 587  * @state: the state object to update with the new property value
 588  * @property: the property to set
 589  * @val: the new property value
 590  *
 591  * Use this instead of calling plane->atomic_set_property directly.
 592  * This function handles generic/core properties and calls out to
 593  * driver's ->atomic_set_property() for driver properties.  To ensure
 594  * consistent behavior you must call this function rather than the
 595  * driver hook directly.
 596  *
 597  * RETURNS:
 598  * Zero on success, error code on failure
 599  */
 600 int drm_atomic_plane_set_property(struct drm_plane *plane,
 601                 struct drm_plane_state *state, struct drm_property *property,
 602                 uint64_t val)
 603 {
 604         struct drm_device *dev = plane->dev;
 605         struct drm_mode_config *config = &dev->mode_config;
 606
 607         if (property == config->prop_fb_id) {
 608                 struct drm_framebuffer *fb = drm_framebuffer_lookup(dev, val);
 609                 drm_atomic_set_fb_for_plane(state, fb);
 610                 if (fb)
 611                         drm_framebuffer_unreference(fb);
 612         } else if (property == config->prop_crtc_id) {
 613                 struct drm_crtc *crtc = drm_crtc_find(dev, val);
 614                 return drm_atomic_set_crtc_for_plane(state, crtc);
 615         } else if (property == config->prop_crtc_x) {
 616                 state->crtc_x = U642I64(val);
 617         } else if (property == config->prop_crtc_y) {
 618                 state->crtc_y = U642I64(val);
 619         } else if (property == config->prop_crtc_w) {
 620                 state->crtc_w = val;
 621         } else if (property == config->prop_crtc_h) {
 622                 state->crtc_h = val;
 623         } else if (property == config->prop_src_x) {
 624                 state->src_x = val;
 625         } else if (property == config->prop_src_y) {
 626                 state->src_y = val;
 627         } else if (property == config->prop_src_w) {
 628                 state->src_w = val;
 629         } else if (property == config->prop_src_h) {
 630                 state->src_h = val;
 631         } else if (property == config->rotation_property) {
 632                 state->rotation = val;
 633         } else if (plane->funcs->atomic_set_property) {
 634                 return plane->funcs->atomic_set_property(plane, state,
 635                                 property, val);
 636         } else {
 637                 return -EINVAL;
 638         }
 639
 640         return 0;
 641 }
 642 EXPORT_SYMBOL(drm_atomic_plane_set_property);
 643
 644 /**
 645  * drm_atomic_plane_get_property - get property value from plane state
 646  * @plane: the drm plane to set a property on
 647  * @state: the state object to get the property value from
 648  * @property: the property to set
 649  * @val: return location for the property value
 650  *
 651  * This function handles generic/core properties and calls out to
 652  * driver's ->atomic_get_property() for driver properties.  To ensure
 653  * consistent behavior you must call this function rather than the
 654  * driver hook directly.
 655  *
 656  * RETURNS:
 657  * Zero on success, error code on failure
 658  */
 659 static int
 660 drm_atomic_plane_get_property(struct drm_plane *plane,
 661                 const struct drm_plane_state *state,
 662                 struct drm_property *property, uint64_t *val)
 663 {
 664         struct drm_device *dev = plane->dev;
 665         struct drm_mode_config *config = &dev->mode_config;
 666
 667         if (property == config->prop_fb_id) {
 668                 *val = (state->fb) ? state->fb->base.id : 0;
 669         } else if (property == config->prop_crtc_id) {
 670                 *val = (state->crtc) ? state->crtc->base.id : 0;
 671         } else if (property == config->prop_crtc_x) {
 672                 *val = I642U64(state->crtc_x);
 673         } else if (property == config->prop_crtc_y) {
 674                 *val = I642U64(state->crtc_y);
 675         } else if (property == config->prop_crtc_w) {
 676                 *val = state->crtc_w;
 677         } else if (property == config->prop_crtc_h) {
 678                 *val = state->crtc_h;
 679         } else if (property == config->prop_src_x) {
 680                 *val = state->src_x;
 681         } else if (property == config->prop_src_y) {
 682                 *val = state->src_y;
 683         } else if (property == config->prop_src_w) {
 684                 *val = state->src_w;
 685         } else if (property == config->prop_src_h) {
 686                 *val = state->src_h;
 687         } else if (property == config->rotation_property) {
 688                 *val = state->rotation;
 689         } else if (plane->funcs->atomic_get_property) {
 690                 return plane->funcs->atomic_get_property(plane, state, property, val);
 691         } else {
 692                 return -EINVAL;
 693         }
 694
 695         return 0;
 696 }
 697
 698 static bool
 699 plane_switching_crtc(struct drm_atomic_state *state,
 700                      struct drm_plane *plane,
 701                      struct drm_plane_state *plane_state)
 702 {
 703         if (!plane->state->crtc || !plane_state->crtc)
 704                 return false;
 705
 706         if (plane->state->crtc == plane_state->crtc)
 707                 return false;
 708
 709         /* This could be refined, but currently there's no helper or driver code
 710          * to implement direct switching of active planes nor userspace to take
 711          * advantage of more direct plane switching without the intermediate
 712          * full OFF state.
 713          */
 714         return true;
 715 }
 716
 717 /**
 718  * drm_atomic_plane_check - check plane state
 719  * @plane: plane to check
 720  * @state: plane state to check
 721  *
 722  * Provides core sanity checks for plane state.
 723  *
 724  * RETURNS:
 725  * Zero on success, error code on failure
 726  */
 727 static int drm_atomic_plane_check(struct drm_plane *plane,
 728                 struct drm_plane_state *state)
 729 {
 730         unsigned int fb_width, fb_height;
 731         int ret;
 732
 733         /* either *both* CRTC and FB must be set, or neither */
 734         if (WARN_ON(state->crtc && !state->fb)) {
 735                 DRM_DEBUG_ATOMIC("CRTC set but no FB\n");
 736                 return -EINVAL;
 737         } else if (WARN_ON(state->fb && !state->crtc)) {
 738                 DRM_DEBUG_ATOMIC("FB set but no CRTC\n");
 739                 return -EINVAL;
 740         }
 741
 742         /* if disabled, we don't care about the rest of the state: */
 743         if (!state->crtc)
 744                 return 0;
 745
 746         /* Check whether this plane is usable on this CRTC */
 747         if (!(plane->possible_crtcs & drm_crtc_mask(state->crtc))) {
 748                 DRM_DEBUG_ATOMIC("Invalid crtc for plane\n");
 749                 return -EINVAL;
 750         }
 751
 752         /* Check whether this plane supports the fb pixel format. */
 753         ret = drm_plane_check_pixel_format(plane, state->fb->pixel_format);
 754         if (ret) {
 755                 DRM_DEBUG_ATOMIC("Invalid pixel format %s\n",
 756                                  drm_get_format_name(state->fb->pixel_format));
 757                 return ret;
 758         }
 759
 760         /* Give drivers some help against integer overflows */
 761         if (state->crtc_w > INT_MAX ||
 762             state->crtc_x > INT_MAX - (int32_t) state->crtc_w ||
 763             state->crtc_h > INT_MAX ||
 764             state->crtc_y > INT_MAX - (int32_t) state->crtc_h) {
 765                 DRM_DEBUG_ATOMIC("Invalid CRTC coordinates %ux%u+%d+%d\n",
 766                                  state->crtc_w, state->crtc_h,
 767                                  state->crtc_x, state->crtc_y);
 768                 return -ERANGE;
 769         }
 770
 771         fb_width = state->fb->width << 16;
 772         fb_height = state->fb->height << 16;
 773
 774         /* Make sure source coordinates are inside the fb. */
 775         if (state->src_w > fb_width ||
 776             state->src_x > fb_width - state->src_w ||
 777             state->src_h > fb_height ||
 778             state->src_y > fb_height - state->src_h) {
 779                 DRM_DEBUG_ATOMIC("Invalid source coordinates "
 780                                  "%u.%06ux%u.%06u+%u.%06u+%u.%06u\n",
 781                                  state->src_w >> 16, ((state->src_w & 0xffff) * 15625) >> 10,
 782                                  state->src_h >> 16, ((state->src_h & 0xffff) * 15625) >> 10,
 783                                  state->src_x >> 16, ((state->src_x & 0xffff) * 15625) >> 10,
 784                                  state->src_y >> 16, ((state->src_y & 0xffff) * 15625) >> 10);
 785                 return -ENOSPC;
 786         }
 787
 788         if (plane_switching_crtc(state->state, plane, state)) {
 789                 DRM_DEBUG_ATOMIC("[PLANE:%d:%s] switching CRTC directly\n",
 790                                  plane->base.id, plane->name);
 791                 return -EINVAL;
 792         }
 793
 794         return 0;
 795 }
 796
 797 /**
 798  * drm_atomic_get_connector_state - get connector state
 799  * @state: global atomic state object
 800  * @connector: connector to get state object for
 801  *
 802  * This function returns the connector state for the given connector,
 803  * allocating it if needed. It will also grab the relevant connector lock to
 804  * make sure that the state is consistent.
 805  *
 806  * Returns:
 807  *
 808  * Either the allocated state or the error code encoded into the pointer. When
 809  * the error is EDEADLK then the w/w mutex code has detected a deadlock and the
 810  * entire atomic sequence must be restarted. All other errors are fatal.
 811  */
 812 struct drm_connector_state *
 813 drm_atomic_get_connector_state(struct drm_atomic_state *state,
 814                           struct drm_connector *connector)
 815 {
 816         int ret, index;
 817         struct drm_mode_config *config = &connector->dev->mode_config;
 818         struct drm_connector_state *connector_state;
 819
 820         ret = drm_modeset_lock(&config->connection_mutex, state->acquire_ctx);
 821         if (ret)
 822                 return ERR_PTR(ret);
 823
 824         index = drm_connector_index(connector);
 825
 826         /*
 827          * Construction of atomic state updates can race with a connector
 828          * hot-add which might overflow. In this case flip the table and just
 829          * restart the entire ioctl - no one is fast enough to livelock a cpu
 830          * with physical hotplug events anyway.
 831          *
 832          * Note that we only grab the indexes once we have the right lock to
 833          * prevent hotplug/unplugging of connectors. So removal is no problem,
 834          * at most the array is a bit too large.
 835          */
 836         if (index >= state->num_connector) {
 837                 DRM_DEBUG_ATOMIC("Hot-added connector would overflow state array, restarting\n");
 838                 return ERR_PTR(-EAGAIN);
 839         }
 840
 841         if (state->connector_states[index])
 842                 return state->connector_states[index];
 843
 844         connector_state = connector->funcs->atomic_duplicate_state(connector);
 845         if (!connector_state)
 846                 return ERR_PTR(-ENOMEM);
 847
 848         state->connector_states[index] = connector_state;
 849         state->connectors[index] = connector;
 850         connector_state->state = state;
 851
 852         DRM_DEBUG_ATOMIC("Added [CONNECTOR:%d] %p state to %p\n",
 853                          connector->base.id, connector_state, state);
 854
 855         if (connector_state->crtc) {
 856                 struct drm_crtc_state *crtc_state;
 857
 858                 crtc_state = drm_atomic_get_crtc_state(state,
 859                                                        connector_state->crtc);
 860                 if (IS_ERR(crtc_state))
 861                         return ERR_CAST(crtc_state);
 862         }
 863
 864         return connector_state;
 865 }
 866 EXPORT_SYMBOL(drm_atomic_get_connector_state);
 867
 868 /**
 869  * drm_atomic_connector_set_property - set property on connector.
 870  * @connector: the drm connector to set a property on
 871  * @state: the state object to update with the new property value
 872  * @property: the property to set
 873  * @val: the new property value
 874  *
 875  * Use this instead of calling connector->atomic_set_property directly.
 876  * This function handles generic/core properties and calls out to
 877  * driver's ->atomic_set_property() for driver properties.  To ensure
 878  * consistent behavior you must call this function rather than the
 879  * driver hook directly.
 880  *
 881  * RETURNS:
 882  * Zero on success, error code on failure
 883  */
 884 int drm_atomic_connector_set_property(struct drm_connector *connector,
 885                 struct drm_connector_state *state, struct drm_property *property,
 886                 uint64_t val)
 887 {
 888         struct drm_device *dev = connector->dev;
 889         struct drm_mode_config *config = &dev->mode_config;
 890
 891         if (property == config->prop_crtc_id) {
 892                 struct drm_crtc *crtc = drm_crtc_find(dev, val);
 893                 return drm_atomic_set_crtc_for_connector(state, crtc);
 894         } else if (property == config->dpms_property) {
 895                 /* setting DPMS property requires special handling, which
 896                  * is done in legacy setprop path for us.  Disallow (for
 897                  * now?) atomic writes to DPMS property:
 898                  */
 899                 return -EINVAL;
 900         } else if (connector->funcs->atomic_set_property) {
 901                 return connector->funcs->atomic_set_property(connector,
 902                                 state, property, val);
 903         } else {
 904                 return -EINVAL;
 905         }
 906 }
 907 EXPORT_SYMBOL(drm_atomic_connector_set_property);
 908
 909 /**
 910  * drm_atomic_connector_get_property - get property value from connector state
 911  * @connector: the drm connector to set a property on
 912  * @state: the state object to get the property value from
 913  * @property: the property to set
 914  * @val: return location for the property value
 915  *
 916  * This function handles generic/core properties and calls out to
 917  * driver's ->atomic_get_property() for driver properties.  To ensure
 918  * consistent behavior you must call this function rather than the
 919  * driver hook directly.
 920  *
 921  * RETURNS:
 922  * Zero on success, error code on failure
 923  */
 924 static int
 925 drm_atomic_connector_get_property(struct drm_connector *connector,
 926                 const struct drm_connector_state *state,
 927                 struct drm_property *property, uint64_t *val)
 928 {
 929         struct drm_device *dev = connector->dev;
 930         struct drm_mode_config *config = &dev->mode_config;
 931
 932         if (property == config->prop_crtc_id) {
 933                 *val = (state->crtc) ? state->crtc->base.id : 0;
 934         } else if (property == config->dpms_property) {
 935                 *val = connector->dpms;
 936         } else if (connector->funcs->atomic_get_property) {
 937                 return connector->funcs->atomic_get_property(connector,
 938                                 state, property, val);
 939         } else {
 940                 return -EINVAL;
 941         }
 942
 943         return 0;
 944 }
 945
 946 int drm_atomic_get_property(struct drm_mode_object *obj,
 947                 struct drm_property *property, uint64_t *val)
 948 {
 949         struct drm_device *dev = property->dev;
 950         int ret;
 951
 952         switch (obj->type) {
 953         case DRM_MODE_OBJECT_CONNECTOR: {
 954                 struct drm_connector *connector = obj_to_connector(obj);
 955                 WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
 956                 ret = drm_atomic_connector_get_property(connector,
 957                                 connector->state, property, val);
 958                 break;
 959         }
 960         case DRM_MODE_OBJECT_CRTC: {
 961                 struct drm_crtc *crtc = obj_to_crtc(obj);
 962                 WARN_ON(!drm_modeset_is_locked(&crtc->mutex));
 963                 ret = drm_atomic_crtc_get_property(crtc,
 964                                 crtc->state, property, val);
 965                 break;
 966         }
 967         case DRM_MODE_OBJECT_PLANE: {
 968                 struct drm_plane *plane = obj_to_plane(obj);
 969                 WARN_ON(!drm_modeset_is_locked(&plane->mutex));
 970                 ret = drm_atomic_plane_get_property(plane,
 971                                 plane->state, property, val);
 972                 break;
 973         }
 974         default:
 975                 ret = -EINVAL;
 976                 break;
 977         }
 978
 979         return ret;
 980 }
 981
 982 /**
 983  * drm_atomic_set_crtc_for_plane - set crtc for plane
 984  * @plane_state: the plane whose incoming state to update
 985  * @crtc: crtc to use for the plane
 986  *
 987  * Changing the assigned crtc for a plane requires us to grab the lock and state
 988  * for the new crtc, as needed. This function takes care of all these details
 989  * besides updating the pointer in the state object itself.
 990  *
 991  * Returns:
 992  * 0 on success or can fail with -EDEADLK or -ENOMEM. When the error is EDEADLK
 993  * then the w/w mutex code has detected a deadlock and the entire atomic
 994  * sequence must be restarted. All other errors are fatal.
 995  */
 996 int
 997 drm_atomic_set_crtc_for_plane(struct drm_plane_state *plane_state,
 998                               struct drm_crtc *crtc)
 999 {
1000         struct drm_plane *plane = plane_state->plane;
1001         struct drm_crtc_state *crtc_state;
1002
1003         if (plane_state->crtc) {
1004                 crtc_state = drm_atomic_get_crtc_state(plane_state->state,
1005                                                        plane_state->crtc);
1006                 if (WARN_ON(IS_ERR(crtc_state)))
1007                         return PTR_ERR(crtc_state);
1008
1009                 crtc_state->plane_mask &= ~(1 << drm_plane_index(plane));
1010         }
1011
1012         plane_state->crtc = crtc;
1013
1014         if (crtc) {
1015                 crtc_state = drm_atomic_get_crtc_state(plane_state->state,
1016                                                        crtc);
1017                 if (IS_ERR(crtc_state))
1018                         return PTR_ERR(crtc_state);
1019                 crtc_state->plane_mask |= (1 << drm_plane_index(plane));
1020         }
1021
1022         if (crtc)
1023                 DRM_DEBUG_ATOMIC("Link plane state %p to [CRTC:%d:%s]\n",
1024                                  plane_state, crtc->base.id, crtc->name);
1025         else
1026                 DRM_DEBUG_ATOMIC("Link plane state %p to [NOCRTC]\n",
1027                                  plane_state);
1028
1029         return 0;
1030 }
1031 EXPORT_SYMBOL(drm_atomic_set_crtc_for_plane);
1032
1033 /**
1034  * drm_atomic_set_fb_for_plane - set framebuffer for plane
1035  * @plane_state: atomic state object for the plane
1036  * @fb: fb to use for the plane
1037  *
1038  * Changing the assigned framebuffer for a plane requires us to grab a reference
1039  * to the new fb and drop the reference to the old fb, if there is one. This
1040  * function takes care of all these details besides updating the pointer in the
1041  * state object itself.
1042  */
1043 void
1044 drm_atomic_set_fb_for_plane(struct drm_plane_state *plane_state,
1045                             struct drm_framebuffer *fb)
1046 {
1047         if (plane_state->fb)
1048                 drm_framebuffer_unreference(plane_state->fb);
1049         if (fb)
1050                 drm_framebuffer_reference(fb);
1051         plane_state->fb = fb;
1052
1053         if (fb)
1054                 DRM_DEBUG_ATOMIC("Set [FB:%d] for plane state %p\n",
1055                                  fb->base.id, plane_state);
1056         else
1057                 DRM_DEBUG_ATOMIC("Set [NOFB] for plane state %p\n",
1058                                  plane_state);
1059 }
1060 EXPORT_SYMBOL(drm_atomic_set_fb_for_plane);
1061
1062 /**
1063  * drm_atomic_set_crtc_for_connector - set crtc for connector
1064  * @conn_state: atomic state object for the connector
1065  * @crtc: crtc to use for the connector
1066  *
1067  * Changing the assigned crtc for a connector requires us to grab the lock and
1068  * state for the new crtc, as needed. This function takes care of all these
1069  * details besides updating the pointer in the state object itself.
1070  *
1071  * Returns:
1072  * 0 on success or can fail with -EDEADLK or -ENOMEM. When the error is EDEADLK
1073  * then the w/w mutex code has detected a deadlock and the entire atomic
1074  * sequence must be restarted. All other errors are fatal.
1075  */
1076 int
1077 drm_atomic_set_crtc_for_connector(struct drm_connector_state *conn_state,
1078                                   struct drm_crtc *crtc)
1079 {
1080         struct drm_crtc_state *crtc_state;
1081
1082         if (conn_state->crtc && conn_state->crtc != crtc) {
1083                 crtc_state = drm_atomic_get_existing_crtc_state(conn_state->state,
1084                                                                 conn_state->crtc);
1085
1086                 crtc_state->connector_mask &=
1087                         ~(1 << drm_connector_index(conn_state->connector));
1088         }
1089
1090         if (crtc) {
1091                 crtc_state = drm_atomic_get_crtc_state(conn_state->state, crtc);
1092                 if (IS_ERR(crtc_state))
1093                         return PTR_ERR(crtc_state);
1094
1095                 crtc_state->connector_mask |=
1096                         1 << drm_connector_index(conn_state->connector);
1097         }
1098
1099         conn_state->crtc = crtc;
1100
1101         if (crtc)
1102                 DRM_DEBUG_ATOMIC("Link connector state %p to [CRTC:%d:%s]\n",
1103                                  conn_state, crtc->base.id, crtc->name);
1104         else
1105                 DRM_DEBUG_ATOMIC("Link connector state %p to [NOCRTC]\n",
1106                                  conn_state);
1107
1108         return 0;
1109 }
1110 EXPORT_SYMBOL(drm_atomic_set_crtc_for_connector);
1111
1112 /**
1113  * drm_atomic_add_affected_connectors - add connectors for crtc
1114  * @state: atomic state
1115  * @crtc: DRM crtc
1116  *
1117  * This function walks the current configuration and adds all connectors
1118  * currently using @crtc to the atomic configuration @state. Note that this
1119  * function must acquire the connection mutex. This can potentially cause
1120  * unneeded seralization if the update is just for the planes on one crtc. Hence
1121  * drivers and helpers should only call this when really needed (e.g. when a
1122  * full modeset needs to happen due to some change).
1123  *
1124  * Returns:
1125  * 0 on success or can fail with -EDEADLK or -ENOMEM. When the error is EDEADLK
1126  * then the w/w mutex code has detected a deadlock and the entire atomic
1127  * sequence must be restarted. All other errors are fatal.
1128  */
1129 int
1130 drm_atomic_add_affected_connectors(struct drm_atomic_state *state,
1131                                    struct drm_crtc *crtc)
1132 {
1133         struct drm_mode_config *config = &state->dev->mode_config;
1134         struct drm_connector *connector;
1135         struct drm_connector_state *conn_state;
1136         int ret;
1137
1138         ret = drm_modeset_lock(&config->connection_mutex, state->acquire_ctx);
1139         if (ret)
1140                 return ret;
1141
1142         DRM_DEBUG_ATOMIC("Adding all current connectors for [CRTC:%d:%s] to %p\n",
1143                          crtc->base.id, crtc->name, state);
1144
1145         /*
1146          * Changed connectors are already in @state, so only need to look at the
1147          * current configuration.
1148          */
1149         drm_for_each_connector(connector, state->dev) {
1150                 if (connector->state->crtc != crtc)
1151                         continue;
1152
1153                 conn_state = drm_atomic_get_connector_state(state, connector);
1154                 if (IS_ERR(conn_state))
1155                         return PTR_ERR(conn_state);
1156         }
1157
1158         return 0;
1159 }
1160 EXPORT_SYMBOL(drm_atomic_add_affected_connectors);
1161
1162 /**
1163  * drm_atomic_add_affected_planes - add planes for crtc
1164  * @state: atomic state
1165  * @crtc: DRM crtc
1166  *
1167  * This function walks the current configuration and adds all planes
1168  * currently used by @crtc to the atomic configuration @state. This is useful
1169  * when an atomic commit also needs to check all currently enabled plane on
1170  * @crtc, e.g. when changing the mode. It's also useful when re-enabling a CRTC
1171  * to avoid special code to force-enable all planes.
1172  *
1173  * Since acquiring a plane state will always also acquire the w/w mutex of the
1174  * current CRTC for that plane (if there is any) adding all the plane states for
1175  * a CRTC will not reduce parallism of atomic updates.
1176  *
1177  * Returns:
1178  * 0 on success or can fail with -EDEADLK or -ENOMEM. When the error is EDEADLK
1179  * then the w/w mutex code has detected a deadlock and the entire atomic
1180  * sequence must be restarted. All other errors are fatal.
1181  */
1182 int
1183 drm_atomic_add_affected_planes(struct drm_atomic_state *state,
1184                                struct drm_crtc *crtc)
1185 {
1186         struct drm_plane *plane;
1187
1188         WARN_ON(!drm_atomic_get_existing_crtc_state(state, crtc));
1189
1190         drm_for_each_plane_mask(plane, state->dev, crtc->state->plane_mask) {
1191                 struct drm_plane_state *plane_state =
1192                         drm_atomic_get_plane_state(state, plane);
1193
1194                 if (IS_ERR(plane_state))
1195                         return PTR_ERR(plane_state);
1196         }
1197         return 0;
1198 }
1199 EXPORT_SYMBOL(drm_atomic_add_affected_planes);
1200
1201 /**
1202  * drm_atomic_legacy_backoff - locking backoff for legacy ioctls
1203  * @state: atomic state
1204  *
1205  * This function should be used by legacy entry points which don't understand
1206  * -EDEADLK semantics. For simplicity this one will grab all modeset locks after
1207  * the slowpath completed.
1208  */
1209 void drm_atomic_legacy_backoff(struct drm_atomic_state *state)
1210 {
1211         int ret;
1212
1213 retry:
1214         drm_modeset_backoff(state->acquire_ctx);
1215
1216         ret = drm_modeset_lock_all_ctx(state->dev, state->acquire_ctx);
1217         if (ret)
1218                 goto retry;
1219 }
1220 EXPORT_SYMBOL(drm_atomic_legacy_backoff);
1221
1222 /**
1223  * drm_atomic_check_only - check whether a given config would work
1224  * @state: atomic configuration to check
1225  *
1226  * Note that this function can return -EDEADLK if the driver needed to acquire
1227  * more locks but encountered a deadlock. The caller must then do the usual w/w
1228  * backoff dance and restart. All other errors are fatal.
1229  *
1230  * Returns:
1231  * 0 on success, negative error code on failure.
1232  */
1233 int drm_atomic_check_only(struct drm_atomic_state *state)
1234 {
1235         struct drm_device *dev = state->dev;
1236         struct drm_mode_config *config = &dev->mode_config;
1237         struct drm_plane *plane;
1238         struct drm_plane_state *plane_state;
1239         struct drm_crtc *crtc;
1240         struct drm_crtc_state *crtc_state;
1241         int i, ret = 0;
1242
1243         DRM_DEBUG_ATOMIC("checking %p\n", state);
1244
1245         for_each_plane_in_state(state, plane, plane_state, i) {
1246                 ret = drm_atomic_plane_check(plane, plane_state);
1247                 if (ret) {
1248                         DRM_DEBUG_ATOMIC("[PLANE:%d:%s] atomic core check failed\n",
1249                                          plane->base.id, plane->name);
1250                         return ret;
1251                 }
1252         }
1253
1254         for_each_crtc_in_state(state, crtc, crtc_state, i) {
1255                 ret = drm_atomic_crtc_check(crtc, crtc_state);
1256                 if (ret) {
1257                         DRM_DEBUG_ATOMIC("[CRTC:%d:%s] atomic core check failed\n",
1258                                          crtc->base.id, crtc->name);
1259                         return ret;
1260                 }
1261         }
1262
1263         if (config->funcs->atomic_check)
1264                 ret = config->funcs->atomic_check(state->dev, state);
1265
1266         if (!state->allow_modeset) {
1267                 for_each_crtc_in_state(state, crtc, crtc_state, i) {
1268                         if (drm_atomic_crtc_needs_modeset(crtc_state)) {
1269                                 DRM_DEBUG_ATOMIC("[CRTC:%d:%s] requires full modeset\n",
1270                                                  crtc->base.id, crtc->name);
1271                                 return -EINVAL;
1272                         }
1273                 }
1274         }
1275
1276         return ret;
1277 }
1278 EXPORT_SYMBOL(drm_atomic_check_only);
1279
1280 /**
1281  * drm_atomic_commit - commit configuration atomically
1282  * @state: atomic configuration to check
1283  *
1284  * Note that this function can return -EDEADLK if the driver needed to acquire
1285  * more locks but encountered a deadlock. The caller must then do the usual w/w
1286  * backoff dance and restart. All other errors are fatal.
1287  *
1288  * Also note that on successful execution ownership of @state is transferred
1289  * from the caller of this function to the function itself. The caller must not
1290  * free or in any other way access @state. If the function fails then the caller
1291  * must clean up @state itself.
1292  *
1293  * Returns:
1294  * 0 on success, negative error code on failure.
1295  */
1296 int drm_atomic_commit(struct drm_atomic_state *state)
1297 {
1298         struct drm_mode_config *config = &state->dev->mode_config;
1299         int ret;
1300
1301         ret = drm_atomic_check_only(state);
1302         if (ret)
1303                 return ret;
1304
1305         DRM_DEBUG_ATOMIC("commiting %p\n", state);
1306
1307         return config->funcs->atomic_commit(state->dev, state, false);
1308 }
1309 EXPORT_SYMBOL(drm_atomic_commit);
1310
1311 /**
1312  * drm_atomic_async_commit - atomic&async configuration commit
1313  * @state: atomic configuration to check
1314  *
1315  * Note that this function can return -EDEADLK if the driver needed to acquire
1316  * more locks but encountered a deadlock. The caller must then do the usual w/w
1317  * backoff dance and restart. All other errors are fatal.
1318  *
1319  * Also note that on successful execution ownership of @state is transferred
1320  * from the caller of this function to the function itself. The caller must not
1321  * free or in any other way access @state. If the function fails then the caller
1322  * must clean up @state itself.
1323  *
1324  * Returns:
1325  * 0 on success, negative error code on failure.
1326  */
1327 int drm_atomic_async_commit(struct drm_atomic_state *state)
1328 {
1329         struct drm_mode_config *config = &state->dev->mode_config;
1330         int ret;
1331
1332         ret = drm_atomic_check_only(state);
1333         if (ret)
1334                 return ret;
1335
1336         DRM_DEBUG_ATOMIC("commiting %p asynchronously\n", state);
1337
1338         return config->funcs->atomic_commit(state->dev, state, true);
1339 }
1340 EXPORT_SYMBOL(drm_atomic_async_commit);
1341
1342 /*
1343  * The big monstor ioctl
1344  */
1345
1346 static struct drm_pending_vblank_event *create_vblank_event(
1347                 struct drm_device *dev, struct drm_file *file_priv, uint64_t user_data)
1348 {
1349         struct drm_pending_vblank_event *e = NULL;
1350         unsigned long flags;
1351
1352         spin_lock_irqsave(&dev->event_lock, flags);
1353         if (file_priv->event_space < sizeof e->event) {
1354                 spin_unlock_irqrestore(&dev->event_lock, flags);
1355                 goto out;
1356         }
1357         file_priv->event_space -= sizeof e->event;
1358         spin_unlock_irqrestore(&dev->event_lock, flags);
1359
1360         e = kzalloc(sizeof *e, GFP_KERNEL);
1361         if (e == NULL) {
1362                 spin_lock_irqsave(&dev->event_lock, flags);
1363                 file_priv->event_space += sizeof e->event;
1364                 spin_unlock_irqrestore(&dev->event_lock, flags);
1365                 goto out;
1366         }
1367
1368         e->event.base.type = DRM_EVENT_FLIP_COMPLETE;
1369         e->event.base.length = sizeof e->event;
1370         e->event.user_data = user_data;
1371         e->base.event = &e->event.base;
1372         e->base.file_priv = file_priv;
1373         e->base.destroy = (void (*) (struct drm_pending_event *)) kfree;
1374
1375 out:
1376         return e;
1377 }
1378
1379 static void destroy_vblank_event(struct drm_device *dev,
1380                 struct drm_file *file_priv, struct drm_pending_vblank_event *e)
1381 {
1382         unsigned long flags;
1383
1384         spin_lock_irqsave(&dev->event_lock, flags);
1385         file_priv->event_space += sizeof e->event;
1386         spin_unlock_irqrestore(&dev->event_lock, flags);
1387         kfree(e);
1388 }
1389
1390 static int atomic_set_prop(struct drm_atomic_state *state,
1391                 struct drm_mode_object *obj, struct drm_property *prop,
1392                 uint64_t prop_value)
1393 {
1394         struct drm_mode_object *ref;
1395         int ret;
1396
1397         if (!drm_property_change_valid_get(prop, prop_value, &ref))
1398                 return -EINVAL;
1399
1400         switch (obj->type) {
1401         case DRM_MODE_OBJECT_CONNECTOR: {
1402                 struct drm_connector *connector = obj_to_connector(obj);
1403                 struct drm_connector_state *connector_state;
1404
1405                 connector_state = drm_atomic_get_connector_state(state, connector);
1406                 if (IS_ERR(connector_state)) {
1407                         ret = PTR_ERR(connector_state);
1408                         break;
1409                 }
1410
1411                 ret = drm_atomic_connector_set_property(connector,
1412                                 connector_state, prop, prop_value);
1413                 break;
1414         }
1415         case DRM_MODE_OBJECT_CRTC: {
1416                 struct drm_crtc *crtc = obj_to_crtc(obj);
1417                 struct drm_crtc_state *crtc_state;
1418
1419                 crtc_state = drm_atomic_get_crtc_state(state, crtc);
1420                 if (IS_ERR(crtc_state)) {
1421                         ret = PTR_ERR(crtc_state);
1422                         break;
1423                 }
1424
1425                 ret = drm_atomic_crtc_set_property(crtc,
1426                                 crtc_state, prop, prop_value);
1427                 break;
1428         }
1429         case DRM_MODE_OBJECT_PLANE: {
1430                 struct drm_plane *plane = obj_to_plane(obj);
1431                 struct drm_plane_state *plane_state;
1432
1433                 plane_state = drm_atomic_get_plane_state(state, plane);
1434                 if (IS_ERR(plane_state)) {
1435                         ret = PTR_ERR(plane_state);
1436                         break;
1437                 }
1438
1439                 ret = drm_atomic_plane_set_property(plane,
1440                                 plane_state, prop, prop_value);
1441                 break;
1442         }
1443         default:
1444                 ret = -EINVAL;
1445                 break;
1446         }
1447
1448         drm_property_change_valid_put(prop, ref);
1449         return ret;
1450 }
1451
1452 /**
1453  * drm_atomic_clean_old_fb -- Unset old_fb pointers and set plane->fb pointers.
1454  *
1455  * @dev: drm device to check.
1456  * @plane_mask: plane mask for planes that were updated.
1457  * @ret: return value, can be -EDEADLK for a retry.
1458  *
1459  * Before doing an update plane->old_fb is set to plane->fb,
1460  * but before dropping the locks old_fb needs to be set to NULL
1461  * and plane->fb updated. This is a common operation for each
1462  * atomic update, so this call is split off as a helper.
1463  */
1464 void drm_atomic_clean_old_fb(struct drm_device *dev,
1465                              unsigned plane_mask,
1466                              int ret)
1467 {
1468         struct drm_plane *plane;
1469
1470         /* if succeeded, fixup legacy plane crtc/fb ptrs before dropping
1471          * locks (ie. while it is still safe to deref plane->state).  We
1472          * need to do this here because the driver entry points cannot
1473          * distinguish between legacy and atomic ioctls.
1474          */
1475         drm_for_each_plane_mask(plane, dev, plane_mask) {
1476                 if (ret == 0) {
1477                         struct drm_framebuffer *new_fb = plane->state->fb;
1478                         if (new_fb)
1479                                 drm_framebuffer_reference(new_fb);
1480                         plane->fb = new_fb;
1481                         plane->crtc = plane->state->crtc;
1482
1483                         if (plane->old_fb)
1484                                 drm_framebuffer_unreference(plane->old_fb);
1485                 }
1486                 plane->old_fb = NULL;
1487         }
1488 }
1489 EXPORT_SYMBOL(drm_atomic_clean_old_fb);
1490
1491 int drm_mode_atomic_ioctl(struct drm_device *dev,
1492                           void *data, struct drm_file *file_priv)
1493 {
1494         struct drm_mode_atomic *arg = data;
1495         uint32_t __user *objs_ptr = (uint32_t __user *)(unsigned long)(arg->objs_ptr);
1496         uint32_t __user *count_props_ptr = (uint32_t __user *)(unsigned long)(arg->count_props_ptr);
1497         uint32_t __user *props_ptr = (uint32_t __user *)(unsigned long)(arg->props_ptr);
1498         uint64_t __user *prop_values_ptr = (uint64_t __user *)(unsigned long)(arg->prop_values_ptr);
1499         unsigned int copied_objs, copied_props;
1500         struct drm_atomic_state *state;
1501         struct drm_modeset_acquire_ctx ctx;
1502         struct drm_plane *plane;
1503         struct drm_crtc *crtc;
1504         struct drm_crtc_state *crtc_state;
1505         unsigned plane_mask;
1506         int ret = 0;
1507         unsigned int i, j;
1508
1509         /* disallow for drivers not supporting atomic: */
1510         if (!drm_core_check_feature(dev, DRIVER_ATOMIC))
1511                 return -EINVAL;
1512
1513         /* disallow for userspace that has not enabled atomic cap (even
1514          * though this may be a bit overkill, since legacy userspace
1515          * wouldn't know how to call this ioctl)
1516          */
1517         if (!file_priv->atomic)
1518                 return -EINVAL;
1519
1520         if (arg->flags & ~DRM_MODE_ATOMIC_FLAGS)
1521                 return -EINVAL;
1522
1523         if (arg->reserved)
1524                 return -EINVAL;
1525
1526         if ((arg->flags & DRM_MODE_PAGE_FLIP_ASYNC) &&
1527                         !dev->mode_config.async_page_flip)
1528                 return -EINVAL;
1529
1530         /* can't test and expect an event at the same time. */
1531         if ((arg->flags & DRM_MODE_ATOMIC_TEST_ONLY) &&
1532                         (arg->flags & DRM_MODE_PAGE_FLIP_EVENT))
1533                 return -EINVAL;
1534
1535         drm_modeset_acquire_init(&ctx, 0);
1536
1537         state = drm_atomic_state_alloc(dev);
1538         if (!state)
1539                 return -ENOMEM;
1540
1541         state->acquire_ctx = &ctx;
1542         state->allow_modeset = !!(arg->flags & DRM_MODE_ATOMIC_ALLOW_MODESET);
1543
1544 retry:
1545         plane_mask = 0;
1546         copied_objs = 0;
1547         copied_props = 0;
1548
1549         for (i = 0; i < arg->count_objs; i++) {
1550                 uint32_t obj_id, count_props;
1551                 struct drm_mode_object *obj;
1552
1553                 if (get_user(obj_id, objs_ptr + copied_objs)) {
1554                         ret = -EFAULT;
1555                         goto out;
1556                 }
1557
1558                 obj = drm_mode_object_find(dev, obj_id, DRM_MODE_OBJECT_ANY);
1559                 if (!obj || !obj->properties) {
1560                         ret = -ENOENT;
1561                         goto out;
1562                 }
1563
1564                 if (get_user(count_props, count_props_ptr + copied_objs)) {
1565                         ret = -EFAULT;
1566                         goto out;
1567                 }
1568
1569                 copied_objs++;
1570
1571                 for (j = 0; j < count_props; j++) {
1572                         uint32_t prop_id;
1573                         uint64_t prop_value;
1574                         struct drm_property *prop;
1575
1576                         if (get_user(prop_id, props_ptr + copied_props)) {
1577                                 ret = -EFAULT;
1578                                 goto out;
1579                         }
1580
1581                         prop = drm_property_find(dev, prop_id);
1582                         if (!prop) {
1583                                 ret = -ENOENT;
1584                                 goto out;
1585                         }
1586
1587                         if (copy_from_user(&prop_value,
1588                                            prop_values_ptr + copied_props,
1589                                            sizeof(prop_value))) {
1590                                 ret = -EFAULT;
1591                                 goto out;
1592                         }
1593
1594                         ret = atomic_set_prop(state, obj, prop, prop_value);
1595                         if (ret)
1596                                 goto out;
1597
1598                         copied_props++;
1599                 }
1600
1601                 if (obj->type == DRM_MODE_OBJECT_PLANE && count_props &&
1602                     !(arg->flags & DRM_MODE_ATOMIC_TEST_ONLY)) {
1603                         plane = obj_to_plane(obj);
1604                         plane_mask |= (1 << drm_plane_index(plane));
1605                         plane->old_fb = plane->fb;
1606                 }
1607         }
1608
1609         if (arg->flags & DRM_MODE_PAGE_FLIP_EVENT) {
1610                 for_each_crtc_in_state(state, crtc, crtc_state, i) {
1611                         struct drm_pending_vblank_event *e;
1612
1613                         e = create_vblank_event(dev, file_priv, arg->user_data);
1614                         if (!e) {
1615                                 ret = -ENOMEM;
1616                                 goto out;
1617                         }
1618
1619                         crtc_state->event = e;
1620                 }
1621         }
1622
1623         if (arg->flags & DRM_MODE_ATOMIC_TEST_ONLY) {
1624                 /*
1625                  * Unlike commit, check_only does not clean up state.
1626                  * Below we call drm_atomic_state_free for it.
1627                  */
1628                 ret = drm_atomic_check_only(state);
1629         } else if (arg->flags & DRM_MODE_ATOMIC_NONBLOCK) {
1630                 ret = drm_atomic_async_commit(state);
1631         } else {
1632                 ret = drm_atomic_commit(state);
1633         }
1634
1635 out:
1636         drm_atomic_clean_old_fb(dev, plane_mask, ret);
1637
1638         if (ret && arg->flags & DRM_MODE_PAGE_FLIP_EVENT) {
1639                 /*
1640                  * TEST_ONLY and PAGE_FLIP_EVENT are mutually exclusive,
1641                  * if they weren't, this code should be called on success
1642                  * for TEST_ONLY too.
1643                  */
1644
1645                 for_each_crtc_in_state(state, crtc, crtc_state, i) {
1646                         if (!crtc_state->event)
1647                                 continue;
1648
1649                         destroy_vblank_event(dev, file_priv,
1650                                              crtc_state->event);
1651                 }
1652         }
1653
1654         if (ret == -EDEADLK) {
1655                 drm_atomic_state_clear(state);
1656                 drm_modeset_backoff(&ctx);
1657                 goto retry;
1658         }
1659
1660         if (ret || arg->flags & DRM_MODE_ATOMIC_TEST_ONLY)
1661                 drm_atomic_state_free(state);
1662
1663         drm_modeset_drop_locks(&ctx);
1664         drm_modeset_acquire_fini(&ctx);
1665
1666         return ret;
1667 }