kernel/drivers/gpu/drm/drm_atomic.c

   1 /*
   2  * Copyright (C) 2014 Red Hat
   3  * Copyright (C) 2014 Intel Corp.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   9  * and/or sell copies of the Software, and to permit persons to whom the
  10  * Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice shall be included in
  13  * all copies or substantial portions of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  19  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  20  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  21  * OTHER DEALINGS IN THE SOFTWARE.
  22  *
  23  * Authors:
  24  * Rob Clark <robdclark@gmail.com>
  25  * Daniel Vetter <daniel.vetter@ffwll.ch>
  26  */
  27
  28
  29 #include <drm/drmP.h>
  30 #include <drm/drm_atomic.h>
  31 #include <drm/drm_plane_helper.h>
  32
  33 static void kfree_state(struct drm_atomic_state *state)
  34 {
  35         kfree(state->connectors);
  36         kfree(state->connector_states);
  37         kfree(state->crtcs);
  38         kfree(state->crtc_states);
  39         kfree(state->planes);
  40         kfree(state->plane_states);
  41         kfree(state);
  42 }
  43
  44 /**
  45  * drm_atomic_state_alloc - allocate atomic state
  46  * @dev: DRM device
  47  *
  48  * This allocates an empty atomic state to track updates.
  49  */
  50 struct drm_atomic_state *
  51 drm_atomic_state_alloc(struct drm_device *dev)
  52 {
  53         struct drm_atomic_state *state;
  54
  55         state = kzalloc(sizeof(*state), GFP_KERNEL);
  56         if (!state)
  57                 return NULL;
  58
  59         /* TODO legacy paths should maybe do a better job about
  60          * setting this appropriately?
  61          */
  62         state->allow_modeset = true;
  63
  64         state->num_connector = ACCESS_ONCE(dev->mode_config.num_connector);
  65
  66         state->crtcs = kcalloc(dev->mode_config.num_crtc,
  67                                sizeof(*state->crtcs), GFP_KERNEL);
  68         if (!state->crtcs)
  69                 goto fail;
  70         state->crtc_states = kcalloc(dev->mode_config.num_crtc,
  71                                      sizeof(*state->crtc_states), GFP_KERNEL);
  72         if (!state->crtc_states)
  73                 goto fail;
  74         state->planes = kcalloc(dev->mode_config.num_total_plane,
  75                                 sizeof(*state->planes), GFP_KERNEL);
  76         if (!state->planes)
  77                 goto fail;
  78         state->plane_states = kcalloc(dev->mode_config.num_total_plane,
  79                                       sizeof(*state->plane_states), GFP_KERNEL);
  80         if (!state->plane_states)
  81                 goto fail;
  82         state->connectors = kcalloc(state->num_connector,
  83                                     sizeof(*state->connectors),
  84                                     GFP_KERNEL);
  85         if (!state->connectors)
  86                 goto fail;
  87         state->connector_states = kcalloc(state->num_connector,
  88                                           sizeof(*state->connector_states),
  89                                           GFP_KERNEL);
  90         if (!state->connector_states)
  91                 goto fail;
  92
  93         state->dev = dev;
  94
  95         DRM_DEBUG_ATOMIC("Allocate atomic state %p\n", state);
  96
  97         return state;
  98 fail:
  99         kfree_state(state);
 100
 101         return NULL;
 102 }
 103 EXPORT_SYMBOL(drm_atomic_state_alloc);
 104
 105 /**
 106  * drm_atomic_state_clear - clear state object
 107  * @state: atomic state
 108  *
 109  * When the w/w mutex algorithm detects a deadlock we need to back off and drop
 110  * all locks. So someone else could sneak in and change the current modeset
 111  * configuration. Which means that all the state assembled in @state is no
 112  * longer an atomic update to the current state, but to some arbitrary earlier
 113  * state. Which could break assumptions the driver's ->atomic_check likely
 114  * relies on.
 115  *
 116  * Hence we must clear all cached state and completely start over, using this
 117  * function.
 118  */
 119 void drm_atomic_state_clear(struct drm_atomic_state *state)
 120 {
 121         struct drm_device *dev = state->dev;
 122         struct drm_mode_config *config = &dev->mode_config;
 123         int i;
 124
 125         DRM_DEBUG_ATOMIC("Clearing atomic state %p\n", state);
 126
 127         for (i = 0; i < state->num_connector; i++) {
 128                 struct drm_connector *connector = state->connectors[i];
 129
 130                 if (!connector)
 131                         continue;
 132
 133                 WARN_ON(!drm_modeset_is_locked(&config->connection_mutex));
 134
 135                 connector->funcs->atomic_destroy_state(connector,
 136                                                        state->connector_states[i]);
 137                 state->connectors[i] = NULL;
 138                 state->connector_states[i] = NULL;
 139         }
 140
 141         for (i = 0; i < config->num_crtc; i++) {
 142                 struct drm_crtc *crtc = state->crtcs[i];
 143
 144                 if (!crtc)
 145                         continue;
 146
 147                 crtc->funcs->atomic_destroy_state(crtc,
 148                                                   state->crtc_states[i]);
 149                 state->crtcs[i] = NULL;
 150                 state->crtc_states[i] = NULL;
 151         }
 152
 153         for (i = 0; i < config->num_total_plane; i++) {
 154                 struct drm_plane *plane = state->planes[i];
 155
 156                 if (!plane)
 157                         continue;
 158
 159                 plane->funcs->atomic_destroy_state(plane,
 160                                                    state->plane_states[i]);
 161                 state->planes[i] = NULL;
 162                 state->plane_states[i] = NULL;
 163         }
 164 }
 165 EXPORT_SYMBOL(drm_atomic_state_clear);
 166
 167 /**
 168  * drm_atomic_state_free - free all memory for an atomic state
 169  * @state: atomic state to deallocate
 170  *
 171  * This frees all memory associated with an atomic state, including all the
 172  * per-object state for planes, crtcs and connectors.
 173  */
 174 void drm_atomic_state_free(struct drm_atomic_state *state)
 175 {
 176         if (!state)
 177                 return;
 178
 179         drm_atomic_state_clear(state);
 180
 181         DRM_DEBUG_ATOMIC("Freeing atomic state %p\n", state);
 182
 183         kfree_state(state);
 184 }
 185 EXPORT_SYMBOL(drm_atomic_state_free);
 186
 187 /**
 188  * drm_atomic_get_crtc_state - get crtc state
 189  * @state: global atomic state object
 190  * @crtc: crtc to get state object for
 191  *
 192  * This function returns the crtc state for the given crtc, allocating it if
 193  * needed. It will also grab the relevant crtc lock to make sure that the state
 194  * is consistent.
 195  *
 196  * Returns:
 197  *
 198  * Either the allocated state or the error code encoded into the pointer. When
 199  * the error is EDEADLK then the w/w mutex code has detected a deadlock and the
 200  * entire atomic sequence must be restarted. All other errors are fatal.
 201  */
 202 struct drm_crtc_state *
 203 drm_atomic_get_crtc_state(struct drm_atomic_state *state,
 204                           struct drm_crtc *crtc)
 205 {
 206         int ret, index;
 207         struct drm_crtc_state *crtc_state;
 208
 209         index = drm_crtc_index(crtc);
 210
 211         if (state->crtc_states[index])
 212                 return state->crtc_states[index];
 213
 214         ret = drm_modeset_lock(&crtc->mutex, state->acquire_ctx);
 215         if (ret)
 216                 return ERR_PTR(ret);
 217
 218         crtc_state = crtc->funcs->atomic_duplicate_state(crtc);
 219         if (!crtc_state)
 220                 return ERR_PTR(-ENOMEM);
 221
 222         state->crtc_states[index] = crtc_state;
 223         state->crtcs[index] = crtc;
 224         crtc_state->state = state;
 225
 226         DRM_DEBUG_ATOMIC("Added [CRTC:%d] %p state to %p\n",
 227                          crtc->base.id, crtc_state, state);
 228
 229         return crtc_state;
 230 }
 231 EXPORT_SYMBOL(drm_atomic_get_crtc_state);
 232
 233 /**
 234  * drm_atomic_crtc_set_property - set property on CRTC
 235  * @crtc: the drm CRTC to set a property on
 236  * @state: the state object to update with the new property value
 237  * @property: the property to set
 238  * @val: the new property value
 239  *
 240  * Use this instead of calling crtc->atomic_set_property directly.
 241  * This function handles generic/core properties and calls out to
 242  * driver's ->atomic_set_property() for driver properties.  To ensure
 243  * consistent behavior you must call this function rather than the
 244  * driver hook directly.
 245  *
 246  * RETURNS:
 247  * Zero on success, error code on failure
 248  */
 249 int drm_atomic_crtc_set_property(struct drm_crtc *crtc,
 250                 struct drm_crtc_state *state, struct drm_property *property,
 251                 uint64_t val)
 252 {
 253         struct drm_device *dev = crtc->dev;
 254         struct drm_mode_config *config = &dev->mode_config;
 255
 256         /* FIXME: Mode prop is missing, which also controls ->enable. */
 257         if (property == config->prop_active)
 258                 state->active = val;
 259         else if (crtc->funcs->atomic_set_property)
 260                 return crtc->funcs->atomic_set_property(crtc, state, property, val);
 261         else
 262                 return -EINVAL;
 263
 264         return 0;
 265 }
 266 EXPORT_SYMBOL(drm_atomic_crtc_set_property);
 267
 268 /*
 269  * This function handles generic/core properties and calls out to
 270  * driver's ->atomic_get_property() for driver properties.  To ensure
 271  * consistent behavior you must call this function rather than the
 272  * driver hook directly.
 273  */
 274 int drm_atomic_crtc_get_property(struct drm_crtc *crtc,
 275                 const struct drm_crtc_state *state,
 276                 struct drm_property *property, uint64_t *val)
 277 {
 278         struct drm_device *dev = crtc->dev;
 279         struct drm_mode_config *config = &dev->mode_config;
 280
 281         if (property == config->prop_active)
 282                 *val = state->active;
 283         else if (crtc->funcs->atomic_get_property)
 284                 return crtc->funcs->atomic_get_property(crtc, state, property, val);
 285         else
 286                 return -EINVAL;
 287
 288         return 0;
 289 }
 290
 291 /**
 292  * drm_atomic_crtc_check - check crtc state
 293  * @crtc: crtc to check
 294  * @state: crtc state to check
 295  *
 296  * Provides core sanity checks for crtc state.
 297  *
 298  * RETURNS:
 299  * Zero on success, error code on failure
 300  */
 301 static int drm_atomic_crtc_check(struct drm_crtc *crtc,
 302                 struct drm_crtc_state *state)
 303 {
 304         /* NOTE: we explicitly don't enforce constraints such as primary
 305          * layer covering entire screen, since that is something we want
 306          * to allow (on hw that supports it).  For hw that does not, it
 307          * should be checked in driver's crtc->atomic_check() vfunc.
 308          *
 309          * TODO: Add generic modeset state checks once we support those.
 310          */
 311
 312         if (state->active && !state->enable) {
 313                 DRM_DEBUG_ATOMIC("[CRTC:%d] active without enabled\n",
 314                                  crtc->base.id);
 315                 return -EINVAL;
 316         }
 317
 318         return 0;
 319 }
 320
 321 /**
 322  * drm_atomic_get_plane_state - get plane state
 323  * @state: global atomic state object
 324  * @plane: plane to get state object for
 325  *
 326  * This function returns the plane state for the given plane, allocating it if
 327  * needed. It will also grab the relevant plane lock to make sure that the state
 328  * is consistent.
 329  *
 330  * Returns:
 331  *
 332  * Either the allocated state or the error code encoded into the pointer. When
 333  * the error is EDEADLK then the w/w mutex code has detected a deadlock and the
 334  * entire atomic sequence must be restarted. All other errors are fatal.
 335  */
 336 struct drm_plane_state *
 337 drm_atomic_get_plane_state(struct drm_atomic_state *state,
 338                           struct drm_plane *plane)
 339 {
 340         int ret, index;
 341         struct drm_plane_state *plane_state;
 342
 343         index = drm_plane_index(plane);
 344
 345         if (state->plane_states[index])
 346                 return state->plane_states[index];
 347
 348         ret = drm_modeset_lock(&plane->mutex, state->acquire_ctx);
 349         if (ret)
 350                 return ERR_PTR(ret);
 351
 352         plane_state = plane->funcs->atomic_duplicate_state(plane);
 353         if (!plane_state)
 354                 return ERR_PTR(-ENOMEM);
 355
 356         state->plane_states[index] = plane_state;
 357         state->planes[index] = plane;
 358         plane_state->state = state;
 359
 360         DRM_DEBUG_ATOMIC("Added [PLANE:%d] %p state to %p\n",
 361                          plane->base.id, plane_state, state);
 362
 363         if (plane_state->crtc) {
 364                 struct drm_crtc_state *crtc_state;
 365
 366                 crtc_state = drm_atomic_get_crtc_state(state,
 367                                                        plane_state->crtc);
 368                 if (IS_ERR(crtc_state))
 369                         return ERR_CAST(crtc_state);
 370         }
 371
 372         return plane_state;
 373 }
 374 EXPORT_SYMBOL(drm_atomic_get_plane_state);
 375
 376 /**
 377  * drm_atomic_plane_set_property - set property on plane
 378  * @plane: the drm plane to set a property on
 379  * @state: the state object to update with the new property value
 380  * @property: the property to set
 381  * @val: the new property value
 382  *
 383  * Use this instead of calling plane->atomic_set_property directly.
 384  * This function handles generic/core properties and calls out to
 385  * driver's ->atomic_set_property() for driver properties.  To ensure
 386  * consistent behavior you must call this function rather than the
 387  * driver hook directly.
 388  *
 389  * RETURNS:
 390  * Zero on success, error code on failure
 391  */
 392 int drm_atomic_plane_set_property(struct drm_plane *plane,
 393                 struct drm_plane_state *state, struct drm_property *property,
 394                 uint64_t val)
 395 {
 396         struct drm_device *dev = plane->dev;
 397         struct drm_mode_config *config = &dev->mode_config;
 398
 399         if (property == config->prop_fb_id) {
 400                 struct drm_framebuffer *fb = drm_framebuffer_lookup(dev, val);
 401                 drm_atomic_set_fb_for_plane(state, fb);
 402                 if (fb)
 403                         drm_framebuffer_unreference(fb);
 404         } else if (property == config->prop_crtc_id) {
 405                 struct drm_crtc *crtc = drm_crtc_find(dev, val);
 406                 return drm_atomic_set_crtc_for_plane(state, crtc);
 407         } else if (property == config->prop_crtc_x) {
 408                 state->crtc_x = U642I64(val);
 409         } else if (property == config->prop_crtc_y) {
 410                 state->crtc_y = U642I64(val);
 411         } else if (property == config->prop_crtc_w) {
 412                 state->crtc_w = val;
 413         } else if (property == config->prop_crtc_h) {
 414                 state->crtc_h = val;
 415         } else if (property == config->prop_src_x) {
 416                 state->src_x = val;
 417         } else if (property == config->prop_src_y) {
 418                 state->src_y = val;
 419         } else if (property == config->prop_src_w) {
 420                 state->src_w = val;
 421         } else if (property == config->prop_src_h) {
 422                 state->src_h = val;
 423         } else if (property == config->rotation_property) {
 424                 state->rotation = val;
 425         } else if (plane->funcs->atomic_set_property) {
 426                 return plane->funcs->atomic_set_property(plane, state,
 427                                 property, val);
 428         } else {
 429                 return -EINVAL;
 430         }
 431
 432         return 0;
 433 }
 434 EXPORT_SYMBOL(drm_atomic_plane_set_property);
 435
 436 /*
 437  * This function handles generic/core properties and calls out to
 438  * driver's ->atomic_get_property() for driver properties.  To ensure
 439  * consistent behavior you must call this function rather than the
 440  * driver hook directly.
 441  */
 442 static int
 443 drm_atomic_plane_get_property(struct drm_plane *plane,
 444                 const struct drm_plane_state *state,
 445                 struct drm_property *property, uint64_t *val)
 446 {
 447         struct drm_device *dev = plane->dev;
 448         struct drm_mode_config *config = &dev->mode_config;
 449
 450         if (property == config->prop_fb_id) {
 451                 *val = (state->fb) ? state->fb->base.id : 0;
 452         } else if (property == config->prop_crtc_id) {
 453                 *val = (state->crtc) ? state->crtc->base.id : 0;
 454         } else if (property == config->prop_crtc_x) {
 455                 *val = I642U64(state->crtc_x);
 456         } else if (property == config->prop_crtc_y) {
 457                 *val = I642U64(state->crtc_y);
 458         } else if (property == config->prop_crtc_w) {
 459                 *val = state->crtc_w;
 460         } else if (property == config->prop_crtc_h) {
 461                 *val = state->crtc_h;
 462         } else if (property == config->prop_src_x) {
 463                 *val = state->src_x;
 464         } else if (property == config->prop_src_y) {
 465                 *val = state->src_y;
 466         } else if (property == config->prop_src_w) {
 467                 *val = state->src_w;
 468         } else if (property == config->prop_src_h) {
 469                 *val = state->src_h;
 470         } else if (property == config->rotation_property) {
 471                 *val = state->rotation;
 472         } else if (plane->funcs->atomic_get_property) {
 473                 return plane->funcs->atomic_get_property(plane, state, property, val);
 474         } else {
 475                 return -EINVAL;
 476         }
 477
 478         return 0;
 479 }
 480
 481 /**
 482  * drm_atomic_plane_check - check plane state
 483  * @plane: plane to check
 484  * @state: plane state to check
 485  *
 486  * Provides core sanity checks for plane state.
 487  *
 488  * RETURNS:
 489  * Zero on success, error code on failure
 490  */
 491 static int drm_atomic_plane_check(struct drm_plane *plane,
 492                 struct drm_plane_state *state)
 493 {
 494         unsigned int fb_width, fb_height;
 495         int ret;
 496
 497         /* either *both* CRTC and FB must be set, or neither */
 498         if (WARN_ON(state->crtc && !state->fb)) {
 499                 DRM_DEBUG_ATOMIC("CRTC set but no FB\n");
 500                 return -EINVAL;
 501         } else if (WARN_ON(state->fb && !state->crtc)) {
 502                 DRM_DEBUG_ATOMIC("FB set but no CRTC\n");
 503                 return -EINVAL;
 504         }
 505
 506         /* if disabled, we don't care about the rest of the state: */
 507         if (!state->crtc)
 508                 return 0;
 509
 510         /* Check whether this plane is usable on this CRTC */
 511         if (!(plane->possible_crtcs & drm_crtc_mask(state->crtc))) {
 512                 DRM_DEBUG_ATOMIC("Invalid crtc for plane\n");
 513                 return -EINVAL;
 514         }
 515
 516         /* Check whether this plane supports the fb pixel format. */
 517         ret = drm_plane_check_pixel_format(plane, state->fb->pixel_format);
 518         if (ret) {
 519                 DRM_DEBUG_ATOMIC("Invalid pixel format %s\n",
 520                                  drm_get_format_name(state->fb->pixel_format));
 521                 return ret;
 522         }
 523
 524         /* Give drivers some help against integer overflows */
 525         if (state->crtc_w > INT_MAX ||
 526             state->crtc_x > INT_MAX - (int32_t) state->crtc_w ||
 527             state->crtc_h > INT_MAX ||
 528             state->crtc_y > INT_MAX - (int32_t) state->crtc_h) {
 529                 DRM_DEBUG_ATOMIC("Invalid CRTC coordinates %ux%u+%d+%d\n",
 530                                  state->crtc_w, state->crtc_h,
 531                                  state->crtc_x, state->crtc_y);
 532                 return -ERANGE;
 533         }
 534
 535         fb_width = state->fb->width << 16;
 536         fb_height = state->fb->height << 16;
 537
 538         /* Make sure source coordinates are inside the fb. */
 539         if (state->src_w > fb_width ||
 540             state->src_x > fb_width - state->src_w ||
 541             state->src_h > fb_height ||
 542             state->src_y > fb_height - state->src_h) {
 543                 DRM_DEBUG_ATOMIC("Invalid source coordinates "
 544                                  "%u.%06ux%u.%06u+%u.%06u+%u.%06u\n",
 545                                  state->src_w >> 16, ((state->src_w & 0xffff) * 15625) >> 10,
 546                                  state->src_h >> 16, ((state->src_h & 0xffff) * 15625) >> 10,
 547                                  state->src_x >> 16, ((state->src_x & 0xffff) * 15625) >> 10,
 548                                  state->src_y >> 16, ((state->src_y & 0xffff) * 15625) >> 10);
 549                 return -ENOSPC;
 550         }
 551
 552         return 0;
 553 }
 554
 555 /**
 556  * drm_atomic_get_connector_state - get connector state
 557  * @state: global atomic state object
 558  * @connector: connector to get state object for
 559  *
 560  * This function returns the connector state for the given connector,
 561  * allocating it if needed. It will also grab the relevant connector lock to
 562  * make sure that the state is consistent.
 563  *
 564  * Returns:
 565  *
 566  * Either the allocated state or the error code encoded into the pointer. When
 567  * the error is EDEADLK then the w/w mutex code has detected a deadlock and the
 568  * entire atomic sequence must be restarted. All other errors are fatal.
 569  */
 570 struct drm_connector_state *
 571 drm_atomic_get_connector_state(struct drm_atomic_state *state,
 572                           struct drm_connector *connector)
 573 {
 574         int ret, index;
 575         struct drm_mode_config *config = &connector->dev->mode_config;
 576         struct drm_connector_state *connector_state;
 577
 578         ret = drm_modeset_lock(&config->connection_mutex, state->acquire_ctx);
 579         if (ret)
 580                 return ERR_PTR(ret);
 581
 582         index = drm_connector_index(connector);
 583
 584         /*
 585          * Construction of atomic state updates can race with a connector
 586          * hot-add which might overflow. In this case flip the table and just
 587          * restart the entire ioctl - no one is fast enough to livelock a cpu
 588          * with physical hotplug events anyway.
 589          *
 590          * Note that we only grab the indexes once we have the right lock to
 591          * prevent hotplug/unplugging of connectors. So removal is no problem,
 592          * at most the array is a bit too large.
 593          */
 594         if (index >= state->num_connector) {
 595                 DRM_DEBUG_ATOMIC("Hot-added connector would overflow state array, restarting\n");
 596                 return ERR_PTR(-EAGAIN);
 597         }
 598
 599         if (state->connector_states[index])
 600                 return state->connector_states[index];
 601
 602         connector_state = connector->funcs->atomic_duplicate_state(connector);
 603         if (!connector_state)
 604                 return ERR_PTR(-ENOMEM);
 605
 606         state->connector_states[index] = connector_state;
 607         state->connectors[index] = connector;
 608         connector_state->state = state;
 609
 610         DRM_DEBUG_ATOMIC("Added [CONNECTOR:%d] %p state to %p\n",
 611                          connector->base.id, connector_state, state);
 612
 613         if (connector_state->crtc) {
 614                 struct drm_crtc_state *crtc_state;
 615
 616                 crtc_state = drm_atomic_get_crtc_state(state,
 617                                                        connector_state->crtc);
 618                 if (IS_ERR(crtc_state))
 619                         return ERR_CAST(crtc_state);
 620         }
 621
 622         return connector_state;
 623 }
 624 EXPORT_SYMBOL(drm_atomic_get_connector_state);
 625
 626 /**
 627  * drm_atomic_connector_set_property - set property on connector.
 628  * @connector: the drm connector to set a property on
 629  * @state: the state object to update with the new property value
 630  * @property: the property to set
 631  * @val: the new property value
 632  *
 633  * Use this instead of calling connector->atomic_set_property directly.
 634  * This function handles generic/core properties and calls out to
 635  * driver's ->atomic_set_property() for driver properties.  To ensure
 636  * consistent behavior you must call this function rather than the
 637  * driver hook directly.
 638  *
 639  * RETURNS:
 640  * Zero on success, error code on failure
 641  */
 642 int drm_atomic_connector_set_property(struct drm_connector *connector,
 643                 struct drm_connector_state *state, struct drm_property *property,
 644                 uint64_t val)
 645 {
 646         struct drm_device *dev = connector->dev;
 647         struct drm_mode_config *config = &dev->mode_config;
 648
 649         if (property == config->prop_crtc_id) {
 650                 struct drm_crtc *crtc = drm_crtc_find(dev, val);
 651                 return drm_atomic_set_crtc_for_connector(state, crtc);
 652         } else if (property == config->dpms_property) {
 653                 /* setting DPMS property requires special handling, which
 654                  * is done in legacy setprop path for us.  Disallow (for
 655                  * now?) atomic writes to DPMS property:
 656                  */
 657                 return -EINVAL;
 658         } else if (connector->funcs->atomic_set_property) {
 659                 return connector->funcs->atomic_set_property(connector,
 660                                 state, property, val);
 661         } else {
 662                 return -EINVAL;
 663         }
 664 }
 665 EXPORT_SYMBOL(drm_atomic_connector_set_property);
 666
 667 /*
 668  * This function handles generic/core properties and calls out to
 669  * driver's ->atomic_get_property() for driver properties.  To ensure
 670  * consistent behavior you must call this function rather than the
 671  * driver hook directly.
 672  */
 673 static int
 674 drm_atomic_connector_get_property(struct drm_connector *connector,
 675                 const struct drm_connector_state *state,
 676                 struct drm_property *property, uint64_t *val)
 677 {
 678         struct drm_device *dev = connector->dev;
 679         struct drm_mode_config *config = &dev->mode_config;
 680
 681         if (property == config->prop_crtc_id) {
 682                 *val = (state->crtc) ? state->crtc->base.id : 0;
 683         } else if (property == config->dpms_property) {
 684                 *val = connector->dpms;
 685         } else if (connector->funcs->atomic_get_property) {
 686                 return connector->funcs->atomic_get_property(connector,
 687                                 state, property, val);
 688         } else {
 689                 return -EINVAL;
 690         }
 691
 692         return 0;
 693 }
 694
 695 int drm_atomic_get_property(struct drm_mode_object *obj,
 696                 struct drm_property *property, uint64_t *val)
 697 {
 698         struct drm_device *dev = property->dev;
 699         int ret;
 700
 701         switch (obj->type) {
 702         case DRM_MODE_OBJECT_CONNECTOR: {
 703                 struct drm_connector *connector = obj_to_connector(obj);
 704                 WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
 705                 ret = drm_atomic_connector_get_property(connector,
 706                                 connector->state, property, val);
 707                 break;
 708         }
 709         case DRM_MODE_OBJECT_CRTC: {
 710                 struct drm_crtc *crtc = obj_to_crtc(obj);
 711                 WARN_ON(!drm_modeset_is_locked(&crtc->mutex));
 712                 ret = drm_atomic_crtc_get_property(crtc,
 713                                 crtc->state, property, val);
 714                 break;
 715         }
 716         case DRM_MODE_OBJECT_PLANE: {
 717                 struct drm_plane *plane = obj_to_plane(obj);
 718                 WARN_ON(!drm_modeset_is_locked(&plane->mutex));
 719                 ret = drm_atomic_plane_get_property(plane,
 720                                 plane->state, property, val);
 721                 break;
 722         }
 723         default:
 724                 ret = -EINVAL;
 725                 break;
 726         }
 727
 728         return ret;
 729 }
 730
 731 /**
 732  * drm_atomic_set_crtc_for_plane - set crtc for plane
 733  * @plane_state: the plane whose incoming state to update
 734  * @crtc: crtc to use for the plane
 735  *
 736  * Changing the assigned crtc for a plane requires us to grab the lock and state
 737  * for the new crtc, as needed. This function takes care of all these details
 738  * besides updating the pointer in the state object itself.
 739  *
 740  * Returns:
 741  * 0 on success or can fail with -EDEADLK or -ENOMEM. When the error is EDEADLK
 742  * then the w/w mutex code has detected a deadlock and the entire atomic
 743  * sequence must be restarted. All other errors are fatal.
 744  */
 745 int
 746 drm_atomic_set_crtc_for_plane(struct drm_plane_state *plane_state,
 747                               struct drm_crtc *crtc)
 748 {
 749         struct drm_plane *plane = plane_state->plane;
 750         struct drm_crtc_state *crtc_state;
 751
 752         if (plane_state->crtc) {
 753                 crtc_state = drm_atomic_get_crtc_state(plane_state->state,
 754                                                        plane_state->crtc);
 755                 if (WARN_ON(IS_ERR(crtc_state)))
 756                         return PTR_ERR(crtc_state);
 757
 758                 crtc_state->plane_mask &= ~(1 << drm_plane_index(plane));
 759         }
 760
 761         plane_state->crtc = crtc;
 762
 763         if (crtc) {
 764                 crtc_state = drm_atomic_get_crtc_state(plane_state->state,
 765                                                        crtc);
 766                 if (IS_ERR(crtc_state))
 767                         return PTR_ERR(crtc_state);
 768                 crtc_state->plane_mask |= (1 << drm_plane_index(plane));
 769         }
 770
 771         if (crtc)
 772                 DRM_DEBUG_ATOMIC("Link plane state %p to [CRTC:%d]\n",
 773                                  plane_state, crtc->base.id);
 774         else
 775                 DRM_DEBUG_ATOMIC("Link plane state %p to [NOCRTC]\n",
 776                                  plane_state);
 777
 778         return 0;
 779 }
 780 EXPORT_SYMBOL(drm_atomic_set_crtc_for_plane);
 781
 782 /**
 783  * drm_atomic_set_fb_for_plane - set framebuffer for plane
 784  * @plane_state: atomic state object for the plane
 785  * @fb: fb to use for the plane
 786  *
 787  * Changing the assigned framebuffer for a plane requires us to grab a reference
 788  * to the new fb and drop the reference to the old fb, if there is one. This
 789  * function takes care of all these details besides updating the pointer in the
 790  * state object itself.
 791  */
 792 void
 793 drm_atomic_set_fb_for_plane(struct drm_plane_state *plane_state,
 794                             struct drm_framebuffer *fb)
 795 {
 796         if (plane_state->fb)
 797                 drm_framebuffer_unreference(plane_state->fb);
 798         if (fb)
 799                 drm_framebuffer_reference(fb);
 800         plane_state->fb = fb;
 801
 802         if (fb)
 803                 DRM_DEBUG_ATOMIC("Set [FB:%d] for plane state %p\n",
 804                                  fb->base.id, plane_state);
 805         else
 806                 DRM_DEBUG_ATOMIC("Set [NOFB] for plane state %p\n",
 807                                  plane_state);
 808 }
 809 EXPORT_SYMBOL(drm_atomic_set_fb_for_plane);
 810
 811 /**
 812  * drm_atomic_set_crtc_for_connector - set crtc for connector
 813  * @conn_state: atomic state object for the connector
 814  * @crtc: crtc to use for the connector
 815  *
 816  * Changing the assigned crtc for a connector requires us to grab the lock and
 817  * state for the new crtc, as needed. This function takes care of all these
 818  * details besides updating the pointer in the state object itself.
 819  *
 820  * Returns:
 821  * 0 on success or can fail with -EDEADLK or -ENOMEM. When the error is EDEADLK
 822  * then the w/w mutex code has detected a deadlock and the entire atomic
 823  * sequence must be restarted. All other errors are fatal.
 824  */
 825 int
 826 drm_atomic_set_crtc_for_connector(struct drm_connector_state *conn_state,
 827                                   struct drm_crtc *crtc)
 828 {
 829         struct drm_crtc_state *crtc_state;
 830
 831         if (crtc) {
 832                 crtc_state = drm_atomic_get_crtc_state(conn_state->state, crtc);
 833                 if (IS_ERR(crtc_state))
 834                         return PTR_ERR(crtc_state);
 835         }
 836
 837         conn_state->crtc = crtc;
 838
 839         if (crtc)
 840                 DRM_DEBUG_ATOMIC("Link connector state %p to [CRTC:%d]\n",
 841                                  conn_state, crtc->base.id);
 842         else
 843                 DRM_DEBUG_ATOMIC("Link connector state %p to [NOCRTC]\n",
 844                                  conn_state);
 845
 846         return 0;
 847 }
 848 EXPORT_SYMBOL(drm_atomic_set_crtc_for_connector);
 849
 850 /**
 851  * drm_atomic_add_affected_connectors - add connectors for crtc
 852  * @state: atomic state
 853  * @crtc: DRM crtc
 854  *
 855  * This function walks the current configuration and adds all connectors
 856  * currently using @crtc to the atomic configuration @state. Note that this
 857  * function must acquire the connection mutex. This can potentially cause
 858  * unneeded seralization if the update is just for the planes on one crtc. Hence
 859  * drivers and helpers should only call this when really needed (e.g. when a
 860  * full modeset needs to happen due to some change).
 861  *
 862  * Returns:
 863  * 0 on success or can fail with -EDEADLK or -ENOMEM. When the error is EDEADLK
 864  * then the w/w mutex code has detected a deadlock and the entire atomic
 865  * sequence must be restarted. All other errors are fatal.
 866  */
 867 int
 868 drm_atomic_add_affected_connectors(struct drm_atomic_state *state,
 869                                    struct drm_crtc *crtc)
 870 {
 871         struct drm_mode_config *config = &state->dev->mode_config;
 872         struct drm_connector *connector;
 873         struct drm_connector_state *conn_state;
 874         int ret;
 875
 876         ret = drm_modeset_lock(&config->connection_mutex, state->acquire_ctx);
 877         if (ret)
 878                 return ret;
 879
 880         DRM_DEBUG_ATOMIC("Adding all current connectors for [CRTC:%d] to %p\n",
 881                          crtc->base.id, state);
 882
 883         /*
 884          * Changed connectors are already in @state, so only need to look at the
 885          * current configuration.
 886          */
 887         list_for_each_entry(connector, &config->connector_list, head) {
 888                 if (connector->state->crtc != crtc)
 889                         continue;
 890
 891                 conn_state = drm_atomic_get_connector_state(state, connector);
 892                 if (IS_ERR(conn_state))
 893                         return PTR_ERR(conn_state);
 894         }
 895
 896         return 0;
 897 }
 898 EXPORT_SYMBOL(drm_atomic_add_affected_connectors);
 899
 900 /**
 901  * drm_atomic_connectors_for_crtc - count number of connected outputs
 902  * @state: atomic state
 903  * @crtc: DRM crtc
 904  *
 905  * This function counts all connectors which will be connected to @crtc
 906  * according to @state. Useful to recompute the enable state for @crtc.
 907  */
 908 int
 909 drm_atomic_connectors_for_crtc(struct drm_atomic_state *state,
 910                                struct drm_crtc *crtc)
 911 {
 912         struct drm_connector *connector;
 913         struct drm_connector_state *conn_state;
 914
 915         int i, num_connected_connectors = 0;
 916
 917         for_each_connector_in_state(state, connector, conn_state, i) {
 918                 if (conn_state->crtc == crtc)
 919                         num_connected_connectors++;
 920         }
 921
 922         DRM_DEBUG_ATOMIC("State %p has %i connectors for [CRTC:%d]\n",
 923                          state, num_connected_connectors, crtc->base.id);
 924
 925         return num_connected_connectors;
 926 }
 927 EXPORT_SYMBOL(drm_atomic_connectors_for_crtc);
 928
 929 /**
 930  * drm_atomic_legacy_backoff - locking backoff for legacy ioctls
 931  * @state: atomic state
 932  *
 933  * This function should be used by legacy entry points which don't understand
 934  * -EDEADLK semantics. For simplicity this one will grab all modeset locks after
 935  * the slowpath completed.
 936  */
 937 void drm_atomic_legacy_backoff(struct drm_atomic_state *state)
 938 {
 939         int ret;
 940
 941 retry:
 942         drm_modeset_backoff(state->acquire_ctx);
 943
 944         ret = drm_modeset_lock(&state->dev->mode_config.connection_mutex,
 945                                state->acquire_ctx);
 946         if (ret)
 947                 goto retry;
 948         ret = drm_modeset_lock_all_crtcs(state->dev,
 949                                          state->acquire_ctx);
 950         if (ret)
 951                 goto retry;
 952 }
 953 EXPORT_SYMBOL(drm_atomic_legacy_backoff);
 954
 955 /**
 956  * drm_atomic_check_only - check whether a given config would work
 957  * @state: atomic configuration to check
 958  *
 959  * Note that this function can return -EDEADLK if the driver needed to acquire
 960  * more locks but encountered a deadlock. The caller must then do the usual w/w
 961  * backoff dance and restart. All other errors are fatal.
 962  *
 963  * Returns:
 964  * 0 on success, negative error code on failure.
 965  */
 966 int drm_atomic_check_only(struct drm_atomic_state *state)
 967 {
 968         struct drm_device *dev = state->dev;
 969         struct drm_mode_config *config = &dev->mode_config;
 970         struct drm_plane *plane;
 971         struct drm_plane_state *plane_state;
 972         struct drm_crtc *crtc;
 973         struct drm_crtc_state *crtc_state;
 974         int i, ret = 0;
 975
 976         DRM_DEBUG_ATOMIC("checking %p\n", state);
 977
 978         for_each_plane_in_state(state, plane, plane_state, i) {
 979                 ret = drm_atomic_plane_check(plane, plane_state);
 980                 if (ret) {
 981                         DRM_DEBUG_ATOMIC("[PLANE:%d] atomic core check failed\n",
 982                                          plane->base.id);
 983                         return ret;
 984                 }
 985         }
 986
 987         for_each_crtc_in_state(state, crtc, crtc_state, i) {
 988                 ret = drm_atomic_crtc_check(crtc, crtc_state);
 989                 if (ret) {
 990                         DRM_DEBUG_ATOMIC("[CRTC:%d] atomic core check failed\n",
 991                                          crtc->base.id);
 992                         return ret;
 993                 }
 994         }
 995
 996         if (config->funcs->atomic_check)
 997                 ret = config->funcs->atomic_check(state->dev, state);
 998
 999         if (!state->allow_modeset) {
1000                 for_each_crtc_in_state(state, crtc, crtc_state, i) {
1001                         if (crtc_state->mode_changed ||
1002                             crtc_state->active_changed) {
1003                                 DRM_DEBUG_ATOMIC("[CRTC:%d] requires full modeset\n",
1004                                                  crtc->base.id);
1005                                 return -EINVAL;
1006                         }
1007                 }
1008         }
1009
1010         return ret;
1011 }
1012 EXPORT_SYMBOL(drm_atomic_check_only);
1013
1014 /**
1015  * drm_atomic_commit - commit configuration atomically
1016  * @state: atomic configuration to check
1017  *
1018  * Note that this function can return -EDEADLK if the driver needed to acquire
1019  * more locks but encountered a deadlock. The caller must then do the usual w/w
1020  * backoff dance and restart. All other errors are fatal.
1021  *
1022  * Also note that on successful execution ownership of @state is transferred
1023  * from the caller of this function to the function itself. The caller must not
1024  * free or in any other way access @state. If the function fails then the caller
1025  * must clean up @state itself.
1026  *
1027  * Returns:
1028  * 0 on success, negative error code on failure.
1029  */
1030 int drm_atomic_commit(struct drm_atomic_state *state)
1031 {
1032         struct drm_mode_config *config = &state->dev->mode_config;
1033         int ret;
1034
1035         ret = drm_atomic_check_only(state);
1036         if (ret)
1037                 return ret;
1038
1039         DRM_DEBUG_ATOMIC("commiting %p\n", state);
1040
1041         return config->funcs->atomic_commit(state->dev, state, false);
1042 }
1043 EXPORT_SYMBOL(drm_atomic_commit);
1044
1045 /**
1046  * drm_atomic_async_commit - atomic&async configuration commit
1047  * @state: atomic configuration to check
1048  *
1049  * Note that this function can return -EDEADLK if the driver needed to acquire
1050  * more locks but encountered a deadlock. The caller must then do the usual w/w
1051  * backoff dance and restart. All other errors are fatal.
1052  *
1053  * Also note that on successful execution ownership of @state is transferred
1054  * from the caller of this function to the function itself. The caller must not
1055  * free or in any other way access @state. If the function fails then the caller
1056  * must clean up @state itself.
1057  *
1058  * Returns:
1059  * 0 on success, negative error code on failure.
1060  */
1061 int drm_atomic_async_commit(struct drm_atomic_state *state)
1062 {
1063         struct drm_mode_config *config = &state->dev->mode_config;
1064         int ret;
1065
1066         ret = drm_atomic_check_only(state);
1067         if (ret)
1068                 return ret;
1069
1070         DRM_DEBUG_ATOMIC("commiting %p asynchronously\n", state);
1071
1072         return config->funcs->atomic_commit(state->dev, state, true);
1073 }
1074 EXPORT_SYMBOL(drm_atomic_async_commit);
1075
1076 /*
1077  * The big monstor ioctl
1078  */
1079
1080 static struct drm_pending_vblank_event *create_vblank_event(
1081                 struct drm_device *dev, struct drm_file *file_priv, uint64_t user_data)
1082 {
1083         struct drm_pending_vblank_event *e = NULL;
1084         unsigned long flags;
1085
1086         spin_lock_irqsave(&dev->event_lock, flags);
1087         if (file_priv->event_space < sizeof e->event) {
1088                 spin_unlock_irqrestore(&dev->event_lock, flags);
1089                 goto out;
1090         }
1091         file_priv->event_space -= sizeof e->event;
1092         spin_unlock_irqrestore(&dev->event_lock, flags);
1093
1094         e = kzalloc(sizeof *e, GFP_KERNEL);
1095         if (e == NULL) {
1096                 spin_lock_irqsave(&dev->event_lock, flags);
1097                 file_priv->event_space += sizeof e->event;
1098                 spin_unlock_irqrestore(&dev->event_lock, flags);
1099                 goto out;
1100         }
1101
1102         e->event.base.type = DRM_EVENT_FLIP_COMPLETE;
1103         e->event.base.length = sizeof e->event;
1104         e->event.user_data = user_data;
1105         e->base.event = &e->event.base;
1106         e->base.file_priv = file_priv;
1107         e->base.destroy = (void (*) (struct drm_pending_event *)) kfree;
1108
1109 out:
1110         return e;
1111 }
1112
1113 static void destroy_vblank_event(struct drm_device *dev,
1114                 struct drm_file *file_priv, struct drm_pending_vblank_event *e)
1115 {
1116         unsigned long flags;
1117
1118         spin_lock_irqsave(&dev->event_lock, flags);
1119         file_priv->event_space += sizeof e->event;
1120         spin_unlock_irqrestore(&dev->event_lock, flags);
1121         kfree(e);
1122 }
1123
1124 static int atomic_set_prop(struct drm_atomic_state *state,
1125                 struct drm_mode_object *obj, struct drm_property *prop,
1126                 uint64_t prop_value)
1127 {
1128         struct drm_mode_object *ref;
1129         int ret;
1130
1131         if (!drm_property_change_valid_get(prop, prop_value, &ref))
1132                 return -EINVAL;
1133
1134         switch (obj->type) {
1135         case DRM_MODE_OBJECT_CONNECTOR: {
1136                 struct drm_connector *connector = obj_to_connector(obj);
1137                 struct drm_connector_state *connector_state;
1138
1139                 connector_state = drm_atomic_get_connector_state(state, connector);
1140                 if (IS_ERR(connector_state)) {
1141                         ret = PTR_ERR(connector_state);
1142                         break;
1143                 }
1144
1145                 ret = drm_atomic_connector_set_property(connector,
1146                                 connector_state, prop, prop_value);
1147                 break;
1148         }
1149         case DRM_MODE_OBJECT_CRTC: {
1150                 struct drm_crtc *crtc = obj_to_crtc(obj);
1151                 struct drm_crtc_state *crtc_state;
1152
1153                 crtc_state = drm_atomic_get_crtc_state(state, crtc);
1154                 if (IS_ERR(crtc_state)) {
1155                         ret = PTR_ERR(crtc_state);
1156                         break;
1157                 }
1158
1159                 ret = drm_atomic_crtc_set_property(crtc,
1160                                 crtc_state, prop, prop_value);
1161                 break;
1162         }
1163         case DRM_MODE_OBJECT_PLANE: {
1164                 struct drm_plane *plane = obj_to_plane(obj);
1165                 struct drm_plane_state *plane_state;
1166
1167                 plane_state = drm_atomic_get_plane_state(state, plane);
1168                 if (IS_ERR(plane_state)) {
1169                         ret = PTR_ERR(plane_state);
1170                         break;
1171                 }
1172
1173                 ret = drm_atomic_plane_set_property(plane,
1174                                 plane_state, prop, prop_value);
1175                 break;
1176         }
1177         default:
1178                 ret = -EINVAL;
1179                 break;
1180         }
1181
1182         drm_property_change_valid_put(prop, ref);
1183         return ret;
1184 }
1185
1186 int drm_mode_atomic_ioctl(struct drm_device *dev,
1187                           void *data, struct drm_file *file_priv)
1188 {
1189         struct drm_mode_atomic *arg = data;
1190         uint32_t __user *objs_ptr = (uint32_t __user *)(unsigned long)(arg->objs_ptr);
1191         uint32_t __user *count_props_ptr = (uint32_t __user *)(unsigned long)(arg->count_props_ptr);
1192         uint32_t __user *props_ptr = (uint32_t __user *)(unsigned long)(arg->props_ptr);
1193         uint64_t __user *prop_values_ptr = (uint64_t __user *)(unsigned long)(arg->prop_values_ptr);
1194         unsigned int copied_objs, copied_props;
1195         struct drm_atomic_state *state;
1196         struct drm_modeset_acquire_ctx ctx;
1197         struct drm_plane *plane;
1198         struct drm_crtc *crtc;
1199         struct drm_crtc_state *crtc_state;
1200         unsigned plane_mask = 0;
1201         int ret = 0;
1202         unsigned int i, j;
1203
1204         /* disallow for drivers not supporting atomic: */
1205         if (!drm_core_check_feature(dev, DRIVER_ATOMIC))
1206                 return -EINVAL;
1207
1208         /* disallow for userspace that has not enabled atomic cap (even
1209          * though this may be a bit overkill, since legacy userspace
1210          * wouldn't know how to call this ioctl)
1211          */
1212         if (!file_priv->atomic)
1213                 return -EINVAL;
1214
1215         if (arg->flags & ~DRM_MODE_ATOMIC_FLAGS)
1216                 return -EINVAL;
1217
1218         if (arg->reserved)
1219                 return -EINVAL;
1220
1221         if ((arg->flags & DRM_MODE_PAGE_FLIP_ASYNC) &&
1222                         !dev->mode_config.async_page_flip)
1223                 return -EINVAL;
1224
1225         /* can't test and expect an event at the same time. */
1226         if ((arg->flags & DRM_MODE_ATOMIC_TEST_ONLY) &&
1227                         (arg->flags & DRM_MODE_PAGE_FLIP_EVENT))
1228                 return -EINVAL;
1229
1230         drm_modeset_acquire_init(&ctx, 0);
1231
1232         state = drm_atomic_state_alloc(dev);
1233         if (!state)
1234                 return -ENOMEM;
1235
1236         state->acquire_ctx = &ctx;
1237         state->allow_modeset = !!(arg->flags & DRM_MODE_ATOMIC_ALLOW_MODESET);
1238
1239 retry:
1240         copied_objs = 0;
1241         copied_props = 0;
1242
1243         for (i = 0; i < arg->count_objs; i++) {
1244                 uint32_t obj_id, count_props;
1245                 struct drm_mode_object *obj;
1246
1247                 if (get_user(obj_id, objs_ptr + copied_objs)) {
1248                         ret = -EFAULT;
1249                         goto fail;
1250                 }
1251
1252                 obj = drm_mode_object_find(dev, obj_id, DRM_MODE_OBJECT_ANY);
1253                 if (!obj || !obj->properties) {
1254                         ret = -ENOENT;
1255                         goto fail;
1256                 }
1257
1258                 if (obj->type == DRM_MODE_OBJECT_PLANE) {
1259                         plane = obj_to_plane(obj);
1260                         plane_mask |= (1 << drm_plane_index(plane));
1261                         plane->old_fb = plane->fb;
1262                 }
1263
1264                 if (get_user(count_props, count_props_ptr + copied_objs)) {
1265                         ret = -EFAULT;
1266                         goto fail;
1267                 }
1268
1269                 copied_objs++;
1270
1271                 for (j = 0; j < count_props; j++) {
1272                         uint32_t prop_id;
1273                         uint64_t prop_value;
1274                         struct drm_property *prop;
1275
1276                         if (get_user(prop_id, props_ptr + copied_props)) {
1277                                 ret = -EFAULT;
1278                                 goto fail;
1279                         }
1280
1281                         prop = drm_property_find(dev, prop_id);
1282                         if (!prop) {
1283                                 ret = -ENOENT;
1284                                 goto fail;
1285                         }
1286
1287                         if (copy_from_user(&prop_value,
1288                                            prop_values_ptr + copied_props,
1289                                            sizeof(prop_value))) {
1290                                 ret = -EFAULT;
1291                                 goto fail;
1292                         }
1293
1294                         ret = atomic_set_prop(state, obj, prop, prop_value);
1295                         if (ret)
1296                                 goto fail;
1297
1298                         copied_props++;
1299                 }
1300         }
1301
1302         if (arg->flags & DRM_MODE_PAGE_FLIP_EVENT) {
1303                 for_each_crtc_in_state(state, crtc, crtc_state, i) {
1304                         struct drm_pending_vblank_event *e;
1305
1306                         e = create_vblank_event(dev, file_priv, arg->user_data);
1307                         if (!e) {
1308                                 ret = -ENOMEM;
1309                                 goto fail;
1310                         }
1311
1312                         crtc_state->event = e;
1313                 }
1314         }
1315
1316         if (arg->flags & DRM_MODE_ATOMIC_TEST_ONLY) {
1317                 ret = drm_atomic_check_only(state);
1318                 /* _check_only() does not free state, unlike _commit() */
1319                 drm_atomic_state_free(state);
1320         } else if (arg->flags & DRM_MODE_ATOMIC_NONBLOCK) {
1321                 ret = drm_atomic_async_commit(state);
1322         } else {
1323                 ret = drm_atomic_commit(state);
1324         }
1325
1326         /* if succeeded, fixup legacy plane crtc/fb ptrs before dropping
1327          * locks (ie. while it is still safe to deref plane->state).  We
1328          * need to do this here because the driver entry points cannot
1329          * distinguish between legacy and atomic ioctls.
1330          */
1331         drm_for_each_plane_mask(plane, dev, plane_mask) {
1332                 if (ret == 0) {
1333                         struct drm_framebuffer *new_fb = plane->state->fb;
1334                         if (new_fb)
1335                                 drm_framebuffer_reference(new_fb);
1336                         plane->fb = new_fb;
1337                         plane->crtc = plane->state->crtc;
1338                 } else {
1339                         plane->old_fb = NULL;
1340                 }
1341                 if (plane->old_fb) {
1342                         drm_framebuffer_unreference(plane->old_fb);
1343                         plane->old_fb = NULL;
1344                 }
1345         }
1346
1347         drm_modeset_drop_locks(&ctx);
1348         drm_modeset_acquire_fini(&ctx);
1349
1350         return ret;
1351
1352 fail:
1353         if (ret == -EDEADLK)
1354                 goto backoff;
1355
1356         if (arg->flags & DRM_MODE_PAGE_FLIP_EVENT) {
1357                 for_each_crtc_in_state(state, crtc, crtc_state, i) {
1358                         destroy_vblank_event(dev, file_priv, crtc_state->event);
1359                         crtc_state->event = NULL;
1360                 }
1361         }
1362
1363         drm_atomic_state_free(state);
1364
1365         drm_modeset_drop_locks(&ctx);
1366         drm_modeset_acquire_fini(&ctx);
1367
1368         return ret;
1369
1370 backoff:
1371         drm_atomic_state_clear(state);
1372         drm_modeset_backoff(&ctx);
1373
1374         goto retry;
1375 }