drivers/gpu/drm/drm_atomic_uapi.c

   1 /*
   2  * Copyright (C) 2014 Red Hat
   3  * Copyright (C) 2014 Intel Corp.
   4  * Copyright (C) 2018 Intel Corp.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the "Software"),
   8  * to deal in the Software without restriction, including without limitation
   9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10  * and/or sell copies of the Software, and to permit persons to whom the
  11  * Software is furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  22  * OTHER DEALINGS IN THE SOFTWARE.
  23  *
  24  * Authors:
  25  * Rob Clark <robdclark@gmail.com>
  26  * Daniel Vetter <daniel.vetter@ffwll.ch>
  27  */
  28
  29 #include <drm/drm_atomic_uapi.h>
  30 #include <drm/drm_atomic.h>
  31 #include <drm/drm_print.h>
  32 #include <drm/drm_drv.h>
  33 #include <drm/drm_writeback.h>
  34 #include <drm/drm_vblank.h>
  35
  36 #include <linux/dma-fence.h>
  37 #include <linux/uaccess.h>
  38 #include <linux/sync_file.h>
  39 #include <linux/file.h>
  40
  41 #include "drm_crtc_internal.h"
  42
  43 /**
  44  * DOC: overview
  45  *
  46  * This file contains the marshalling and demarshalling glue for the atomic UAPI
  47  * in all its forms: The monster ATOMIC IOCTL itself, code for GET_PROPERTY and
  48  * SET_PROPERTY IOCTLs. Plus interface functions for compatibility helpers and
  49  * drivers which have special needs to construct their own atomic updates, e.g.
  50  * for load detect or similiar.
  51  */
  52
  53 /**
  54  * drm_atomic_set_mode_for_crtc - set mode for CRTC
  55  * @state: the CRTC whose incoming state to update
  56  * @mode: kernel-internal mode to use for the CRTC, or NULL to disable
  57  *
  58  * Set a mode (originating from the kernel) on the desired CRTC state and update
  59  * the enable property.
  60  *
  61  * RETURNS:
  62  * Zero on success, error code on failure. Cannot return -EDEADLK.
  63  */
  64 int drm_atomic_set_mode_for_crtc(struct drm_crtc_state *state,
  65                                  const struct drm_display_mode *mode)
  66 {
  67         struct drm_crtc *crtc = state->crtc;
  68         struct drm_mode_modeinfo umode;
  69
  70         /* Early return for no change. */
  71         if (mode && memcmp(&state->mode, mode, sizeof(*mode)) == 0)
  72                 return 0;
  73
  74         drm_property_blob_put(state->mode_blob);
  75         state->mode_blob = NULL;
  76
  77         if (mode) {
  78                 struct drm_property_blob *blob;
  79
  80                 drm_mode_convert_to_umode(&umode, mode);
  81                 blob = drm_property_create_blob(crtc->dev,
  82                                                 sizeof(umode), &umode);
  83                 if (IS_ERR(blob))
  84                         return PTR_ERR(blob);
  85
  86                 drm_mode_copy(&state->mode, mode);
  87
  88                 state->mode_blob = blob;
  89                 state->enable = true;
  90                 DRM_DEBUG_ATOMIC("Set [MODE:%s] for [CRTC:%d:%s] state %p\n",
  91                                  mode->name, crtc->base.id, crtc->name, state);
  92         } else {
  93                 memset(&state->mode, 0, sizeof(state->mode));
  94                 state->enable = false;
  95                 DRM_DEBUG_ATOMIC("Set [NOMODE] for [CRTC:%d:%s] state %p\n",
  96                                  crtc->base.id, crtc->name, state);
  97         }
  98
  99         return 0;
 100 }
 101 EXPORT_SYMBOL(drm_atomic_set_mode_for_crtc);
 102
 103 /**
 104  * drm_atomic_set_mode_prop_for_crtc - set mode for CRTC
 105  * @state: the CRTC whose incoming state to update
 106  * @blob: pointer to blob property to use for mode
 107  *
 108  * Set a mode (originating from a blob property) on the desired CRTC state.
 109  * This function will take a reference on the blob property for the CRTC state,
 110  * and release the reference held on the state's existing mode property, if any
 111  * was set.
 112  *
 113  * RETURNS:
 114  * Zero on success, error code on failure. Cannot return -EDEADLK.
 115  */
 116 int drm_atomic_set_mode_prop_for_crtc(struct drm_crtc_state *state,
 117                                       struct drm_property_blob *blob)
 118 {
 119         struct drm_crtc *crtc = state->crtc;
 120
 121         if (blob == state->mode_blob)
 122                 return 0;
 123
 124         drm_property_blob_put(state->mode_blob);
 125         state->mode_blob = NULL;
 126
 127         memset(&state->mode, 0, sizeof(state->mode));
 128
 129         if (blob) {
 130                 int ret;
 131
 132                 if (blob->length != sizeof(struct drm_mode_modeinfo)) {
 133                         DRM_DEBUG_ATOMIC("[CRTC:%d:%s] bad mode blob length: %zu\n",
 134                                          crtc->base.id, crtc->name,
 135                                          blob->length);
 136                         return -EINVAL;
 137                 }
 138
 139                 ret = drm_mode_convert_umode(crtc->dev,
 140                                              &state->mode, blob->data);
 141                 if (ret) {
 142                         DRM_DEBUG_ATOMIC("[CRTC:%d:%s] invalid mode (ret=%d, status=%s):\n",
 143                                          crtc->base.id, crtc->name,
 144                                          ret, drm_get_mode_status_name(state->mode.status));
 145                         drm_mode_debug_printmodeline(&state->mode);
 146                         return -EINVAL;
 147                 }
 148
 149                 state->mode_blob = drm_property_blob_get(blob);
 150                 state->enable = true;
 151                 DRM_DEBUG_ATOMIC("Set [MODE:%s] for [CRTC:%d:%s] state %p\n",
 152                                  state->mode.name, crtc->base.id, crtc->name,
 153                                  state);
 154         } else {
 155                 state->enable = false;
 156                 DRM_DEBUG_ATOMIC("Set [NOMODE] for [CRTC:%d:%s] state %p\n",
 157                                  crtc->base.id, crtc->name, state);
 158         }
 159
 160         return 0;
 161 }
 162 EXPORT_SYMBOL(drm_atomic_set_mode_prop_for_crtc);
 163
 164 /**
 165  * drm_atomic_set_crtc_for_plane - set CRTC for plane
 166  * @plane_state: the plane whose incoming state to update
 167  * @crtc: CRTC to use for the plane
 168  *
 169  * Changing the assigned CRTC for a plane requires us to grab the lock and state
 170  * for the new CRTC, as needed. This function takes care of all these details
 171  * besides updating the pointer in the state object itself.
 172  *
 173  * Returns:
 174  * 0 on success or can fail with -EDEADLK or -ENOMEM. When the error is EDEADLK
 175  * then the w/w mutex code has detected a deadlock and the entire atomic
 176  * sequence must be restarted. All other errors are fatal.
 177  */
 178 int
 179 drm_atomic_set_crtc_for_plane(struct drm_plane_state *plane_state,
 180                               struct drm_crtc *crtc)
 181 {
 182         struct drm_plane *plane = plane_state->plane;
 183         struct drm_crtc_state *crtc_state;
 184         /* Nothing to do for same crtc*/
 185         if (plane_state->crtc == crtc)
 186                 return 0;
 187         if (plane_state->crtc) {
 188                 crtc_state = drm_atomic_get_crtc_state(plane_state->state,
 189                                                        plane_state->crtc);
 190                 if (WARN_ON(IS_ERR(crtc_state)))
 191                         return PTR_ERR(crtc_state);
 192
 193                 crtc_state->plane_mask &= ~drm_plane_mask(plane);
 194         }
 195
 196         plane_state->crtc = crtc;
 197
 198         if (crtc) {
 199                 crtc_state = drm_atomic_get_crtc_state(plane_state->state,
 200                                                        crtc);
 201                 if (IS_ERR(crtc_state))
 202                         return PTR_ERR(crtc_state);
 203                 crtc_state->plane_mask |= drm_plane_mask(plane);
 204         }
 205
 206         if (crtc)
 207                 DRM_DEBUG_ATOMIC("Link [PLANE:%d:%s] state %p to [CRTC:%d:%s]\n",
 208                                  plane->base.id, plane->name, plane_state,
 209                                  crtc->base.id, crtc->name);
 210         else
 211                 DRM_DEBUG_ATOMIC("Link [PLANE:%d:%s] state %p to [NOCRTC]\n",
 212                                  plane->base.id, plane->name, plane_state);
 213
 214         return 0;
 215 }
 216 EXPORT_SYMBOL(drm_atomic_set_crtc_for_plane);
 217
 218 /**
 219  * drm_atomic_set_fb_for_plane - set framebuffer for plane
 220  * @plane_state: atomic state object for the plane
 221  * @fb: fb to use for the plane
 222  *
 223  * Changing the assigned framebuffer for a plane requires us to grab a reference
 224  * to the new fb and drop the reference to the old fb, if there is one. This
 225  * function takes care of all these details besides updating the pointer in the
 226  * state object itself.
 227  */
 228 void
 229 drm_atomic_set_fb_for_plane(struct drm_plane_state *plane_state,
 230                             struct drm_framebuffer *fb)
 231 {
 232         struct drm_plane *plane = plane_state->plane;
 233
 234         if (fb)
 235                 DRM_DEBUG_ATOMIC("Set [FB:%d] for [PLANE:%d:%s] state %p\n",
 236                                  fb->base.id, plane->base.id, plane->name,
 237                                  plane_state);
 238         else
 239                 DRM_DEBUG_ATOMIC("Set [NOFB] for [PLANE:%d:%s] state %p\n",
 240                                  plane->base.id, plane->name, plane_state);
 241
 242         drm_framebuffer_assign(&plane_state->fb, fb);
 243 }
 244 EXPORT_SYMBOL(drm_atomic_set_fb_for_plane);
 245
 246 /**
 247  * drm_atomic_set_fence_for_plane - set fence for plane
 248  * @plane_state: atomic state object for the plane
 249  * @fence: dma_fence to use for the plane
 250  *
 251  * Helper to setup the plane_state fence in case it is not set yet.
 252  * By using this drivers doesn't need to worry if the user choose
 253  * implicit or explicit fencing.
 254  *
 255  * This function will not set the fence to the state if it was set
 256  * via explicit fencing interfaces on the atomic ioctl. In that case it will
 257  * drop the reference to the fence as we are not storing it anywhere.
 258  * Otherwise, if &drm_plane_state.fence is not set this function we just set it
 259  * with the received implicit fence. In both cases this function consumes a
 260  * reference for @fence.
 261  *
 262  * This way explicit fencing can be used to overrule implicit fencing, which is
 263  * important to make explicit fencing use-cases work: One example is using one
 264  * buffer for 2 screens with different refresh rates. Implicit fencing will
 265  * clamp rendering to the refresh rate of the slower screen, whereas explicit
 266  * fence allows 2 independent render and display loops on a single buffer. If a
 267  * driver allows obeys both implicit and explicit fences for plane updates, then
 268  * it will break all the benefits of explicit fencing.
 269  */
 270 void
 271 drm_atomic_set_fence_for_plane(struct drm_plane_state *plane_state,
 272                                struct dma_fence *fence)
 273 {
 274         if (plane_state->fence) {
 275                 dma_fence_put(fence);
 276                 return;
 277         }
 278
 279         plane_state->fence = fence;
 280 }
 281 EXPORT_SYMBOL(drm_atomic_set_fence_for_plane);
 282
 283 /**
 284  * drm_atomic_set_crtc_for_connector - set CRTC for connector
 285  * @conn_state: atomic state object for the connector
 286  * @crtc: CRTC to use for the connector
 287  *
 288  * Changing the assigned CRTC for a connector requires us to grab the lock and
 289  * state for the new CRTC, as needed. This function takes care of all these
 290  * details besides updating the pointer in the state object itself.
 291  *
 292  * Returns:
 293  * 0 on success or can fail with -EDEADLK or -ENOMEM. When the error is EDEADLK
 294  * then the w/w mutex code has detected a deadlock and the entire atomic
 295  * sequence must be restarted. All other errors are fatal.
 296  */
 297 int
 298 drm_atomic_set_crtc_for_connector(struct drm_connector_state *conn_state,
 299                                   struct drm_crtc *crtc)
 300 {
 301         struct drm_connector *connector = conn_state->connector;
 302         struct drm_crtc_state *crtc_state;
 303
 304         if (conn_state->crtc == crtc)
 305                 return 0;
 306
 307         if (conn_state->crtc) {
 308                 crtc_state = drm_atomic_get_new_crtc_state(conn_state->state,
 309                                                            conn_state->crtc);
 310
 311                 crtc_state->connector_mask &=
 312                         ~drm_connector_mask(conn_state->connector);
 313
 314                 drm_connector_put(conn_state->connector);
 315                 conn_state->crtc = NULL;
 316         }
 317
 318         if (crtc) {
 319                 crtc_state = drm_atomic_get_crtc_state(conn_state->state, crtc);
 320                 if (IS_ERR(crtc_state))
 321                         return PTR_ERR(crtc_state);
 322
 323                 crtc_state->connector_mask |=
 324                         drm_connector_mask(conn_state->connector);
 325
 326                 drm_connector_get(conn_state->connector);
 327                 conn_state->crtc = crtc;
 328
 329                 DRM_DEBUG_ATOMIC("Link [CONNECTOR:%d:%s] state %p to [CRTC:%d:%s]\n",
 330                                  connector->base.id, connector->name,
 331                                  conn_state, crtc->base.id, crtc->name);
 332         } else {
 333                 DRM_DEBUG_ATOMIC("Link [CONNECTOR:%d:%s] state %p to [NOCRTC]\n",
 334                                  connector->base.id, connector->name,
 335                                  conn_state);
 336         }
 337
 338         return 0;
 339 }
 340 EXPORT_SYMBOL(drm_atomic_set_crtc_for_connector);
 341
 342 static void set_out_fence_for_crtc(struct drm_atomic_state *state,
 343                                    struct drm_crtc *crtc, s32 __user *fence_ptr)
 344 {
 345         state->crtcs[drm_crtc_index(crtc)].out_fence_ptr = fence_ptr;
 346 }
 347
 348 static s32 __user *get_out_fence_for_crtc(struct drm_atomic_state *state,
 349                                           struct drm_crtc *crtc)
 350 {
 351         s32 __user *fence_ptr;
 352
 353         fence_ptr = state->crtcs[drm_crtc_index(crtc)].out_fence_ptr;
 354         state->crtcs[drm_crtc_index(crtc)].out_fence_ptr = NULL;
 355
 356         return fence_ptr;
 357 }
 358
 359 static int set_out_fence_for_connector(struct drm_atomic_state *state,
 360                                         struct drm_connector *connector,
 361                                         s32 __user *fence_ptr)
 362 {
 363         unsigned int index = drm_connector_index(connector);
 364
 365         if (!fence_ptr)
 366                 return 0;
 367
 368         if (put_user(-1, fence_ptr))
 369                 return -EFAULT;
 370
 371         state->connectors[index].out_fence_ptr = fence_ptr;
 372
 373         return 0;
 374 }
 375
 376 static s32 __user *get_out_fence_for_connector(struct drm_atomic_state *state,
 377                                                struct drm_connector *connector)
 378 {
 379         unsigned int index = drm_connector_index(connector);
 380         s32 __user *fence_ptr;
 381
 382         fence_ptr = state->connectors[index].out_fence_ptr;
 383         state->connectors[index].out_fence_ptr = NULL;
 384
 385         return fence_ptr;
 386 }
 387
 388 static int
 389 drm_atomic_replace_property_blob_from_id(struct drm_device *dev,
 390                                          struct drm_property_blob **blob,
 391                                          uint64_t blob_id,
 392                                          ssize_t expected_size,
 393                                          ssize_t expected_elem_size,
 394                                          bool *replaced)
 395 {
 396         struct drm_property_blob *new_blob = NULL;
 397
 398         if (blob_id != 0) {
 399                 new_blob = drm_property_lookup_blob(dev, blob_id);
 400                 if (new_blob == NULL)
 401                         return -EINVAL;
 402
 403                 if (expected_size > 0 &&
 404                     new_blob->length != expected_size) {
 405                         drm_property_blob_put(new_blob);
 406                         return -EINVAL;
 407                 }
 408                 if (expected_elem_size > 0 &&
 409                     new_blob->length % expected_elem_size != 0) {
 410                         drm_property_blob_put(new_blob);
 411                         return -EINVAL;
 412                 }
 413         }
 414
 415         *replaced |= drm_property_replace_blob(blob, new_blob);
 416         drm_property_blob_put(new_blob);
 417
 418         return 0;
 419 }
 420
 421 static int drm_atomic_crtc_set_property(struct drm_crtc *crtc,
 422                 struct drm_crtc_state *state, struct drm_property *property,
 423                 uint64_t val)
 424 {
 425         struct drm_device *dev = crtc->dev;
 426         struct drm_mode_config *config = &dev->mode_config;
 427         bool replaced = false;
 428         int ret;
 429
 430         if (property == config->prop_active)
 431                 state->active = val;
 432         else if (property == config->prop_mode_id) {
 433                 struct drm_property_blob *mode =
 434                         drm_property_lookup_blob(dev, val);
 435                 ret = drm_atomic_set_mode_prop_for_crtc(state, mode);
 436                 drm_property_blob_put(mode);
 437                 return ret;
 438         } else if (property == config->prop_vrr_enabled) {
 439                 state->vrr_enabled = val;
 440         } else if (property == config->degamma_lut_property) {
 441                 ret = drm_atomic_replace_property_blob_from_id(dev,
 442                                         &state->degamma_lut,
 443                                         val,
 444                                         -1, sizeof(struct drm_color_lut),
 445                                         &replaced);
 446                 state->color_mgmt_changed |= replaced;
 447                 return ret;
 448         } else if (property == config->ctm_property) {
 449                 ret = drm_atomic_replace_property_blob_from_id(dev,
 450                                         &state->ctm,
 451                                         val,
 452                                         sizeof(struct drm_color_ctm), -1,
 453                                         &replaced);
 454                 state->color_mgmt_changed |= replaced;
 455                 return ret;
 456         } else if (property == config->gamma_lut_property) {
 457                 ret = drm_atomic_replace_property_blob_from_id(dev,
 458                                         &state->gamma_lut,
 459                                         val,
 460                                         -1, sizeof(struct drm_color_lut),
 461                                         &replaced);
 462                 state->color_mgmt_changed |= replaced;
 463                 return ret;
 464         } else if (property == config->prop_out_fence_ptr) {
 465                 s32 __user *fence_ptr = u64_to_user_ptr(val);
 466
 467                 if (!fence_ptr)
 468                         return 0;
 469
 470                 if (put_user(-1, fence_ptr))
 471                         return -EFAULT;
 472
 473                 set_out_fence_for_crtc(state->state, crtc, fence_ptr);
 474         } else if (crtc->funcs->atomic_set_property) {
 475                 return crtc->funcs->atomic_set_property(crtc, state, property, val);
 476         } else {
 477                 DRM_DEBUG_ATOMIC("[CRTC:%d:%s] unknown property [PROP:%d:%s]]\n",
 478                                  crtc->base.id, crtc->name,
 479                                  property->base.id, property->name);
 480                 return -EINVAL;
 481         }
 482
 483         return 0;
 484 }
 485
 486 static int
 487 drm_atomic_crtc_get_property(struct drm_crtc *crtc,
 488                 const struct drm_crtc_state *state,
 489                 struct drm_property *property, uint64_t *val)
 490 {
 491         struct drm_device *dev = crtc->dev;
 492         struct drm_mode_config *config = &dev->mode_config;
 493
 494         if (property == config->prop_active)
 495                 *val = drm_atomic_crtc_effectively_active(state);
 496         else if (property == config->prop_mode_id)
 497                 *val = (state->mode_blob) ? state->mode_blob->base.id : 0;
 498         else if (property == config->prop_vrr_enabled)
 499                 *val = state->vrr_enabled;
 500         else if (property == config->degamma_lut_property)
 501                 *val = (state->degamma_lut) ? state->degamma_lut->base.id : 0;
 502         else if (property == config->ctm_property)
 503                 *val = (state->ctm) ? state->ctm->base.id : 0;
 504         else if (property == config->gamma_lut_property)
 505                 *val = (state->gamma_lut) ? state->gamma_lut->base.id : 0;
 506         else if (property == config->prop_out_fence_ptr)
 507                 *val = 0;
 508         else if (crtc->funcs->atomic_get_property)
 509                 return crtc->funcs->atomic_get_property(crtc, state, property, val);
 510         else
 511                 return -EINVAL;
 512
 513         return 0;
 514 }
 515
 516 static int drm_atomic_plane_set_property(struct drm_plane *plane,
 517                 struct drm_plane_state *state, struct drm_file *file_priv,
 518                 struct drm_property *property, uint64_t val)
 519 {
 520         struct drm_device *dev = plane->dev;
 521         struct drm_mode_config *config = &dev->mode_config;
 522         bool replaced = false;
 523         int ret;
 524
 525         if (property == config->prop_fb_id) {
 526                 struct drm_framebuffer *fb;
 527
 528                 fb = drm_framebuffer_lookup(dev, file_priv, val);
 529                 drm_atomic_set_fb_for_plane(state, fb);
 530                 if (fb)
 531                         drm_framebuffer_put(fb);
 532         } else if (property == config->prop_in_fence_fd) {
 533                 if (state->fence)
 534                         return -EINVAL;
 535
 536                 if (U642I64(val) == -1)
 537                         return 0;
 538
 539                 state->fence = sync_file_get_fence(val);
 540                 if (!state->fence)
 541                         return -EINVAL;
 542
 543         } else if (property == config->prop_crtc_id) {
 544                 struct drm_crtc *crtc = drm_crtc_find(dev, file_priv, val);
 545
 546                 if (val && !crtc)
 547                         return -EACCES;
 548                 return drm_atomic_set_crtc_for_plane(state, crtc);
 549         } else if (property == config->prop_crtc_x) {
 550                 state->crtc_x = U642I64(val);
 551         } else if (property == config->prop_crtc_y) {
 552                 state->crtc_y = U642I64(val);
 553         } else if (property == config->prop_crtc_w) {
 554                 state->crtc_w = val;
 555         } else if (property == config->prop_crtc_h) {
 556                 state->crtc_h = val;
 557         } else if (property == config->prop_src_x) {
 558                 state->src_x = val;
 559         } else if (property == config->prop_src_y) {
 560                 state->src_y = val;
 561         } else if (property == config->prop_src_w) {
 562                 state->src_w = val;
 563         } else if (property == config->prop_src_h) {
 564                 state->src_h = val;
 565         } else if (property == plane->alpha_property) {
 566                 state->alpha = val;
 567         } else if (property == plane->blend_mode_property) {
 568                 state->pixel_blend_mode = val;
 569         } else if (property == plane->rotation_property) {
 570                 if (!is_power_of_2(val & DRM_MODE_ROTATE_MASK)) {
 571                         DRM_DEBUG_ATOMIC("[PLANE:%d:%s] bad rotation bitmask: 0x%llx\n",
 572                                          plane->base.id, plane->name, val);
 573                         return -EINVAL;
 574                 }
 575                 state->rotation = val;
 576         } else if (property == plane->zpos_property) {
 577                 state->zpos = val;
 578         } else if (property == plane->color_encoding_property) {
 579                 state->color_encoding = val;
 580         } else if (property == plane->color_range_property) {
 581                 state->color_range = val;
 582         } else if (property == config->prop_fb_damage_clips) {
 583                 ret = drm_atomic_replace_property_blob_from_id(dev,
 584                                         &state->fb_damage_clips,
 585                                         val,
 586                                         -1,
 587                                         sizeof(struct drm_rect),
 588                                         &replaced);
 589                 return ret;
 590         } else if (plane->funcs->atomic_set_property) {
 591                 return plane->funcs->atomic_set_property(plane, state,
 592                                 property, val);
 593         } else {
 594                 DRM_DEBUG_ATOMIC("[PLANE:%d:%s] unknown property [PROP:%d:%s]]\n",
 595                                  plane->base.id, plane->name,
 596                                  property->base.id, property->name);
 597                 return -EINVAL;
 598         }
 599
 600         return 0;
 601 }
 602
 603 static int
 604 drm_atomic_plane_get_property(struct drm_plane *plane,
 605                 const struct drm_plane_state *state,
 606                 struct drm_property *property, uint64_t *val)
 607 {
 608         struct drm_device *dev = plane->dev;
 609         struct drm_mode_config *config = &dev->mode_config;
 610
 611         if (property == config->prop_fb_id) {
 612                 *val = (state->fb) ? state->fb->base.id : 0;
 613         } else if (property == config->prop_in_fence_fd) {
 614                 *val = -1;
 615         } else if (property == config->prop_crtc_id) {
 616                 *val = (state->crtc) ? state->crtc->base.id : 0;
 617         } else if (property == config->prop_crtc_x) {
 618                 *val = I642U64(state->crtc_x);
 619         } else if (property == config->prop_crtc_y) {
 620                 *val = I642U64(state->crtc_y);
 621         } else if (property == config->prop_crtc_w) {
 622                 *val = state->crtc_w;
 623         } else if (property == config->prop_crtc_h) {
 624                 *val = state->crtc_h;
 625         } else if (property == config->prop_src_x) {
 626                 *val = state->src_x;
 627         } else if (property == config->prop_src_y) {
 628                 *val = state->src_y;
 629         } else if (property == config->prop_src_w) {
 630                 *val = state->src_w;
 631         } else if (property == config->prop_src_h) {
 632                 *val = state->src_h;
 633         } else if (property == plane->alpha_property) {
 634                 *val = state->alpha;
 635         } else if (property == plane->blend_mode_property) {
 636                 *val = state->pixel_blend_mode;
 637         } else if (property == plane->rotation_property) {
 638                 *val = state->rotation;
 639         } else if (property == plane->zpos_property) {
 640                 *val = state->zpos;
 641         } else if (property == plane->color_encoding_property) {
 642                 *val = state->color_encoding;
 643         } else if (property == plane->color_range_property) {
 644                 *val = state->color_range;
 645         } else if (property == config->prop_fb_damage_clips) {
 646                 *val = (state->fb_damage_clips) ?
 647                         state->fb_damage_clips->base.id : 0;
 648         } else if (plane->funcs->atomic_get_property) {
 649                 return plane->funcs->atomic_get_property(plane, state, property, val);
 650         } else {
 651                 return -EINVAL;
 652         }
 653
 654         return 0;
 655 }
 656
 657 static int drm_atomic_set_writeback_fb_for_connector(
 658                 struct drm_connector_state *conn_state,
 659                 struct drm_framebuffer *fb)
 660 {
 661         int ret;
 662
 663         ret = drm_writeback_set_fb(conn_state, fb);
 664         if (ret < 0)
 665                 return ret;
 666
 667         if (fb)
 668                 DRM_DEBUG_ATOMIC("Set [FB:%d] for connector state %p\n",
 669                                  fb->base.id, conn_state);
 670         else
 671                 DRM_DEBUG_ATOMIC("Set [NOFB] for connector state %p\n",
 672                                  conn_state);
 673
 674         return 0;
 675 }
 676
 677 static int drm_atomic_connector_set_property(struct drm_connector *connector,
 678                 struct drm_connector_state *state, struct drm_file *file_priv,
 679                 struct drm_property *property, uint64_t val)
 680 {
 681         struct drm_device *dev = connector->dev;
 682         struct drm_mode_config *config = &dev->mode_config;
 683         bool replaced = false;
 684         int ret;
 685
 686         if (property == config->prop_crtc_id) {
 687                 struct drm_crtc *crtc = drm_crtc_find(dev, file_priv, val);
 688
 689                 if (val && !crtc)
 690                         return -EACCES;
 691                 return drm_atomic_set_crtc_for_connector(state, crtc);
 692         } else if (property == config->dpms_property) {
 693                 /* setting DPMS property requires special handling, which
 694                  * is done in legacy setprop path for us.  Disallow (for
 695                  * now?) atomic writes to DPMS property:
 696                  */
 697                 return -EINVAL;
 698         } else if (property == config->tv_select_subconnector_property) {
 699                 state->tv.subconnector = val;
 700         } else if (property == config->tv_left_margin_property) {
 701                 state->tv.margins.left = val;
 702         } else if (property == config->tv_right_margin_property) {
 703                 state->tv.margins.right = val;
 704         } else if (property == config->tv_top_margin_property) {
 705                 state->tv.margins.top = val;
 706         } else if (property == config->tv_bottom_margin_property) {
 707                 state->tv.margins.bottom = val;
 708         } else if (property == config->tv_mode_property) {
 709                 state->tv.mode = val;
 710         } else if (property == config->tv_brightness_property) {
 711                 state->tv.brightness = val;
 712         } else if (property == config->tv_contrast_property) {
 713                 state->tv.contrast = val;
 714         } else if (property == config->tv_flicker_reduction_property) {
 715                 state->tv.flicker_reduction = val;
 716         } else if (property == config->tv_overscan_property) {
 717                 state->tv.overscan = val;
 718         } else if (property == config->tv_saturation_property) {
 719                 state->tv.saturation = val;
 720         } else if (property == config->tv_hue_property) {
 721                 state->tv.hue = val;
 722         } else if (property == config->link_status_property) {
 723                 /* Never downgrade from GOOD to BAD on userspace's request here,
 724                  * only hw issues can do that.
 725                  *
 726                  * For an atomic property the userspace doesn't need to be able
 727                  * to understand all the properties, but needs to be able to
 728                  * restore the state it wants on VT switch. So if the userspace
 729                  * tries to change the link_status from GOOD to BAD, driver
 730                  * silently rejects it and returns a 0. This prevents userspace
 731                  * from accidently breaking  the display when it restores the
 732                  * state.
 733                  */
 734                 if (state->link_status != DRM_LINK_STATUS_GOOD)
 735                         state->link_status = val;
 736         } else if (property == config->hdr_output_metadata_property) {
 737                 ret = drm_atomic_replace_property_blob_from_id(dev,
 738                                 &state->hdr_output_metadata,
 739                                 val,
 740                                 sizeof(struct hdr_output_metadata), -1,
 741                                 &replaced);
 742                 return ret;
 743         } else if (property == config->aspect_ratio_property) {
 744                 state->picture_aspect_ratio = val;
 745         } else if (property == config->content_type_property) {
 746                 state->content_type = val;
 747         } else if (property == connector->scaling_mode_property) {
 748                 state->scaling_mode = val;
 749         } else if (property == config->content_protection_property) {
 750                 if (val == DRM_MODE_CONTENT_PROTECTION_ENABLED) {
 751                         DRM_DEBUG_KMS("only drivers can set CP Enabled\n");
 752                         return -EINVAL;
 753                 }
 754                 state->content_protection = val;
 755         } else if (property == config->hdcp_content_type_property) {
 756                 state->hdcp_content_type = val;
 757         } else if (property == connector->colorspace_property) {
 758                 state->colorspace = val;
 759         } else if (property == config->writeback_fb_id_property) {
 760                 struct drm_framebuffer *fb;
 761                 int ret;
 762
 763                 fb = drm_framebuffer_lookup(dev, file_priv, val);
 764                 ret = drm_atomic_set_writeback_fb_for_connector(state, fb);
 765                 if (fb)
 766                         drm_framebuffer_put(fb);
 767                 return ret;
 768         } else if (property == config->writeback_out_fence_ptr_property) {
 769                 s32 __user *fence_ptr = u64_to_user_ptr(val);
 770
 771                 return set_out_fence_for_connector(state->state, connector,
 772                                                    fence_ptr);
 773         } else if (property == connector->max_bpc_property) {
 774                 state->max_requested_bpc = val;
 775         } else if (connector->funcs->atomic_set_property) {
 776                 return connector->funcs->atomic_set_property(connector,
 777                                 state, property, val);
 778         } else {
 779                 DRM_DEBUG_ATOMIC("[CONNECTOR:%d:%s] unknown property [PROP:%d:%s]]\n",
 780                                  connector->base.id, connector->name,
 781                                  property->base.id, property->name);
 782                 return -EINVAL;
 783         }
 784
 785         return 0;
 786 }
 787
 788 static int
 789 drm_atomic_connector_get_property(struct drm_connector *connector,
 790                 const struct drm_connector_state *state,
 791                 struct drm_property *property, uint64_t *val)
 792 {
 793         struct drm_device *dev = connector->dev;
 794         struct drm_mode_config *config = &dev->mode_config;
 795
 796         if (property == config->prop_crtc_id) {
 797                 *val = (state->crtc) ? state->crtc->base.id : 0;
 798         } else if (property == config->dpms_property) {
 799                 if (state->crtc && state->crtc->state->self_refresh_active)
 800                         *val = DRM_MODE_DPMS_ON;
 801                 else
 802                         *val = connector->dpms;
 803         } else if (property == config->tv_select_subconnector_property) {
 804                 *val = state->tv.subconnector;
 805         } else if (property == config->tv_left_margin_property) {
 806                 *val = state->tv.margins.left;
 807         } else if (property == config->tv_right_margin_property) {
 808                 *val = state->tv.margins.right;
 809         } else if (property == config->tv_top_margin_property) {
 810                 *val = state->tv.margins.top;
 811         } else if (property == config->tv_bottom_margin_property) {
 812                 *val = state->tv.margins.bottom;
 813         } else if (property == config->tv_mode_property) {
 814                 *val = state->tv.mode;
 815         } else if (property == config->tv_brightness_property) {
 816                 *val = state->tv.brightness;
 817         } else if (property == config->tv_contrast_property) {
 818                 *val = state->tv.contrast;
 819         } else if (property == config->tv_flicker_reduction_property) {
 820                 *val = state->tv.flicker_reduction;
 821         } else if (property == config->tv_overscan_property) {
 822                 *val = state->tv.overscan;
 823         } else if (property == config->tv_saturation_property) {
 824                 *val = state->tv.saturation;
 825         } else if (property == config->tv_hue_property) {
 826                 *val = state->tv.hue;
 827         } else if (property == config->link_status_property) {
 828                 *val = state->link_status;
 829         } else if (property == config->aspect_ratio_property) {
 830                 *val = state->picture_aspect_ratio;
 831         } else if (property == config->content_type_property) {
 832                 *val = state->content_type;
 833         } else if (property == connector->colorspace_property) {
 834                 *val = state->colorspace;
 835         } else if (property == connector->scaling_mode_property) {
 836                 *val = state->scaling_mode;
 837         } else if (property == config->hdr_output_metadata_property) {
 838                 *val = state->hdr_output_metadata ?
 839                         state->hdr_output_metadata->base.id : 0;
 840         } else if (property == config->content_protection_property) {
 841                 *val = state->content_protection;
 842         } else if (property == config->hdcp_content_type_property) {
 843                 *val = state->hdcp_content_type;
 844         } else if (property == config->writeback_fb_id_property) {
 845                 /* Writeback framebuffer is one-shot, write and forget */
 846                 *val = 0;
 847         } else if (property == config->writeback_out_fence_ptr_property) {
 848                 *val = 0;
 849         } else if (property == connector->max_bpc_property) {
 850                 *val = state->max_requested_bpc;
 851         } else if (connector->funcs->atomic_get_property) {
 852                 return connector->funcs->atomic_get_property(connector,
 853                                 state, property, val);
 854         } else {
 855                 return -EINVAL;
 856         }
 857
 858         return 0;
 859 }
 860
 861 int drm_atomic_get_property(struct drm_mode_object *obj,
 862                 struct drm_property *property, uint64_t *val)
 863 {
 864         struct drm_device *dev = property->dev;
 865         int ret;
 866
 867         switch (obj->type) {
 868         case DRM_MODE_OBJECT_CONNECTOR: {
 869                 struct drm_connector *connector = obj_to_connector(obj);
 870
 871                 WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
 872                 ret = drm_atomic_connector_get_property(connector,
 873                                 connector->state, property, val);
 874                 break;
 875         }
 876         case DRM_MODE_OBJECT_CRTC: {
 877                 struct drm_crtc *crtc = obj_to_crtc(obj);
 878
 879                 WARN_ON(!drm_modeset_is_locked(&crtc->mutex));
 880                 ret = drm_atomic_crtc_get_property(crtc,
 881                                 crtc->state, property, val);
 882                 break;
 883         }
 884         case DRM_MODE_OBJECT_PLANE: {
 885                 struct drm_plane *plane = obj_to_plane(obj);
 886
 887                 WARN_ON(!drm_modeset_is_locked(&plane->mutex));
 888                 ret = drm_atomic_plane_get_property(plane,
 889                                 plane->state, property, val);
 890                 break;
 891         }
 892         default:
 893                 ret = -EINVAL;
 894                 break;
 895         }
 896
 897         return ret;
 898 }
 899
 900 /*
 901  * The big monster ioctl
 902  */
 903
 904 static struct drm_pending_vblank_event *create_vblank_event(
 905                 struct drm_crtc *crtc, uint64_t user_data)
 906 {
 907         struct drm_pending_vblank_event *e = NULL;
 908
 909         e = kzalloc(sizeof *e, GFP_KERNEL);
 910         if (!e)
 911                 return NULL;
 912
 913         e->event.base.type = DRM_EVENT_FLIP_COMPLETE;
 914         e->event.base.length = sizeof(e->event);
 915         e->event.vbl.crtc_id = crtc->base.id;
 916         e->event.vbl.user_data = user_data;
 917
 918         return e;
 919 }
 920
 921 int drm_atomic_connector_commit_dpms(struct drm_atomic_state *state,
 922                                      struct drm_connector *connector,
 923                                      int mode)
 924 {
 925         struct drm_connector *tmp_connector;
 926         struct drm_connector_state *new_conn_state;
 927         struct drm_crtc *crtc;
 928         struct drm_crtc_state *crtc_state;
 929         int i, ret, old_mode = connector->dpms;
 930         bool active = false;
 931
 932         ret = drm_modeset_lock(&state->dev->mode_config.connection_mutex,
 933                                state->acquire_ctx);
 934         if (ret)
 935                 return ret;
 936
 937         if (mode != DRM_MODE_DPMS_ON)
 938                 mode = DRM_MODE_DPMS_OFF;
 939         connector->dpms = mode;
 940
 941         crtc = connector->state->crtc;
 942         if (!crtc)
 943                 goto out;
 944         ret = drm_atomic_add_affected_connectors(state, crtc);
 945         if (ret)
 946                 goto out;
 947
 948         crtc_state = drm_atomic_get_crtc_state(state, crtc);
 949         if (IS_ERR(crtc_state)) {
 950                 ret = PTR_ERR(crtc_state);
 951                 goto out;
 952         }
 953
 954         for_each_new_connector_in_state(state, tmp_connector, new_conn_state, i) {
 955                 if (new_conn_state->crtc != crtc)
 956                         continue;
 957                 if (tmp_connector->dpms == DRM_MODE_DPMS_ON) {
 958                         active = true;
 959                         break;
 960                 }
 961         }
 962
 963         crtc_state->active = active;
 964         ret = drm_atomic_commit(state);
 965 out:
 966         if (ret != 0)
 967                 connector->dpms = old_mode;
 968         return ret;
 969 }
 970
 971 int drm_atomic_set_property(struct drm_atomic_state *state,
 972                             struct drm_file *file_priv,
 973                             struct drm_mode_object *obj,
 974                             struct drm_property *prop,
 975                             uint64_t prop_value)
 976 {
 977         struct drm_mode_object *ref;
 978         int ret;
 979
 980         if (!drm_property_change_valid_get(prop, prop_value, &ref))
 981                 return -EINVAL;
 982
 983         switch (obj->type) {
 984         case DRM_MODE_OBJECT_CONNECTOR: {
 985                 struct drm_connector *connector = obj_to_connector(obj);
 986                 struct drm_connector_state *connector_state;
 987
 988                 connector_state = drm_atomic_get_connector_state(state, connector);
 989                 if (IS_ERR(connector_state)) {
 990                         ret = PTR_ERR(connector_state);
 991                         break;
 992                 }
 993
 994                 ret = drm_atomic_connector_set_property(connector,
 995                                 connector_state, file_priv,
 996                                 prop, prop_value);
 997                 break;
 998         }
 999         case DRM_MODE_OBJECT_CRTC: {
1000                 struct drm_crtc *crtc = obj_to_crtc(obj);
1001                 struct drm_crtc_state *crtc_state;
1002
1003                 crtc_state = drm_atomic_get_crtc_state(state, crtc);
1004                 if (IS_ERR(crtc_state)) {
1005                         ret = PTR_ERR(crtc_state);
1006                         break;
1007                 }
1008
1009                 ret = drm_atomic_crtc_set_property(crtc,
1010                                 crtc_state, prop, prop_value);
1011                 break;
1012         }
1013         case DRM_MODE_OBJECT_PLANE: {
1014                 struct drm_plane *plane = obj_to_plane(obj);
1015                 struct drm_plane_state *plane_state;
1016
1017                 plane_state = drm_atomic_get_plane_state(state, plane);
1018                 if (IS_ERR(plane_state)) {
1019                         ret = PTR_ERR(plane_state);
1020                         break;
1021                 }
1022
1023                 ret = drm_atomic_plane_set_property(plane,
1024                                 plane_state, file_priv,
1025                                 prop, prop_value);
1026                 break;
1027         }
1028         default:
1029                 ret = -EINVAL;
1030                 break;
1031         }
1032
1033         drm_property_change_valid_put(prop, ref);
1034         return ret;
1035 }
1036
1037 /**
1038  * DOC: explicit fencing properties
1039  *
1040  * Explicit fencing allows userspace to control the buffer synchronization
1041  * between devices. A Fence or a group of fences are transfered to/from
1042  * userspace using Sync File fds and there are two DRM properties for that.
1043  * IN_FENCE_FD on each DRM Plane to send fences to the kernel and
1044  * OUT_FENCE_PTR on each DRM CRTC to receive fences from the kernel.
1045  *
1046  * As a contrast, with implicit fencing the kernel keeps track of any
1047  * ongoing rendering, and automatically ensures that the atomic update waits
1048  * for any pending rendering to complete. For shared buffers represented with
1049  * a &struct dma_buf this is tracked in &struct dma_resv.
1050  * Implicit syncing is how Linux traditionally worked (e.g. DRI2/3 on X.org),
1051  * whereas explicit fencing is what Android wants.
1052  *
1053  * "IN_FENCE_FD”:
1054  *      Use this property to pass a fence that DRM should wait on before
1055  *      proceeding with the Atomic Commit request and show the framebuffer for
1056  *      the plane on the screen. The fence can be either a normal fence or a
1057  *      merged one, the sync_file framework will handle both cases and use a
1058  *      fence_array if a merged fence is received. Passing -1 here means no
1059  *      fences to wait on.
1060  *
1061  *      If the Atomic Commit request has the DRM_MODE_ATOMIC_TEST_ONLY flag
1062  *      it will only check if the Sync File is a valid one.
1063  *
1064  *      On the driver side the fence is stored on the @fence parameter of
1065  *      &struct drm_plane_state. Drivers which also support implicit fencing
1066  *      should set the implicit fence using drm_atomic_set_fence_for_plane(),
1067  *      to make sure there's consistent behaviour between drivers in precedence
1068  *      of implicit vs. explicit fencing.
1069  *
1070  * "OUT_FENCE_PTR”:
1071  *      Use this property to pass a file descriptor pointer to DRM. Once the
1072  *      Atomic Commit request call returns OUT_FENCE_PTR will be filled with
1073  *      the file descriptor number of a Sync File. This Sync File contains the
1074  *      CRTC fence that will be signaled when all framebuffers present on the
1075  *      Atomic Commit * request for that given CRTC are scanned out on the
1076  *      screen.
1077  *
1078  *      The Atomic Commit request fails if a invalid pointer is passed. If the
1079  *      Atomic Commit request fails for any other reason the out fence fd
1080  *      returned will be -1. On a Atomic Commit with the
1081  *      DRM_MODE_ATOMIC_TEST_ONLY flag the out fence will also be set to -1.
1082  *
1083  *      Note that out-fences don't have a special interface to drivers and are
1084  *      internally represented by a &struct drm_pending_vblank_event in struct
1085  *      &drm_crtc_state, which is also used by the nonblocking atomic commit
1086  *      helpers and for the DRM event handling for existing userspace.
1087  */
1088
1089 struct drm_out_fence_state {
1090         s32 __user *out_fence_ptr;
1091         struct sync_file *sync_file;
1092         int fd;
1093 };
1094
1095 static int setup_out_fence(struct drm_out_fence_state *fence_state,
1096                            struct dma_fence *fence)
1097 {
1098         fence_state->fd = get_unused_fd_flags(O_CLOEXEC);
1099         if (fence_state->fd < 0)
1100                 return fence_state->fd;
1101
1102         if (put_user(fence_state->fd, fence_state->out_fence_ptr))
1103                 return -EFAULT;
1104
1105         fence_state->sync_file = sync_file_create(fence);
1106         if (!fence_state->sync_file)
1107                 return -ENOMEM;
1108
1109         return 0;
1110 }
1111
1112 static int prepare_signaling(struct drm_device *dev,
1113                                   struct drm_atomic_state *state,
1114                                   struct drm_mode_atomic *arg,
1115                                   struct drm_file *file_priv,
1116                                   struct drm_out_fence_state **fence_state,
1117                                   unsigned int *num_fences)
1118 {
1119         struct drm_crtc *crtc;
1120         struct drm_crtc_state *crtc_state;
1121         struct drm_connector *conn;
1122         struct drm_connector_state *conn_state;
1123         int i, c = 0, ret;
1124
1125         if (arg->flags & DRM_MODE_ATOMIC_TEST_ONLY)
1126                 return 0;
1127
1128         for_each_new_crtc_in_state(state, crtc, crtc_state, i) {
1129                 s32 __user *fence_ptr;
1130
1131                 fence_ptr = get_out_fence_for_crtc(crtc_state->state, crtc);
1132
1133                 if (arg->flags & DRM_MODE_PAGE_FLIP_EVENT || fence_ptr) {
1134                         struct drm_pending_vblank_event *e;
1135
1136                         e = create_vblank_event(crtc, arg->user_data);
1137                         if (!e)
1138                                 return -ENOMEM;
1139
1140                         crtc_state->event = e;
1141                 }
1142
1143                 if (arg->flags & DRM_MODE_PAGE_FLIP_EVENT) {
1144                         struct drm_pending_vblank_event *e = crtc_state->event;
1145
1146                         if (!file_priv)
1147                                 continue;
1148
1149                         ret = drm_event_reserve_init(dev, file_priv, &e->base,
1150                                                      &e->event.base);
1151                         if (ret) {
1152                                 kfree(e);
1153                                 crtc_state->event = NULL;
1154                                 return ret;
1155                         }
1156                 }
1157
1158                 if (fence_ptr) {
1159                         struct dma_fence *fence;
1160                         struct drm_out_fence_state *f;
1161
1162                         f = krealloc(*fence_state, sizeof(**fence_state) *
1163                                      (*num_fences + 1), GFP_KERNEL);
1164                         if (!f)
1165                                 return -ENOMEM;
1166
1167                         memset(&f[*num_fences], 0, sizeof(*f));
1168
1169                         f[*num_fences].out_fence_ptr = fence_ptr;
1170                         *fence_state = f;
1171
1172                         fence = drm_crtc_create_fence(crtc);
1173                         if (!fence)
1174                                 return -ENOMEM;
1175
1176                         ret = setup_out_fence(&f[(*num_fences)++], fence);
1177                         if (ret) {
1178                                 dma_fence_put(fence);
1179                                 return ret;
1180                         }
1181
1182                         crtc_state->event->base.fence = fence;
1183                 }
1184
1185                 c++;
1186         }
1187
1188         for_each_new_connector_in_state(state, conn, conn_state, i) {
1189                 struct drm_writeback_connector *wb_conn;
1190                 struct drm_out_fence_state *f;
1191                 struct dma_fence *fence;
1192                 s32 __user *fence_ptr;
1193
1194                 if (!conn_state->writeback_job)
1195                         continue;
1196
1197                 fence_ptr = get_out_fence_for_connector(state, conn);
1198                 if (!fence_ptr)
1199                         continue;
1200
1201                 f = krealloc(*fence_state, sizeof(**fence_state) *
1202                              (*num_fences + 1), GFP_KERNEL);
1203                 if (!f)
1204                         return -ENOMEM;
1205
1206                 memset(&f[*num_fences], 0, sizeof(*f));
1207
1208                 f[*num_fences].out_fence_ptr = fence_ptr;
1209                 *fence_state = f;
1210
1211                 wb_conn = drm_connector_to_writeback(conn);
1212                 fence = drm_writeback_get_out_fence(wb_conn);
1213                 if (!fence)
1214                         return -ENOMEM;
1215
1216                 ret = setup_out_fence(&f[(*num_fences)++], fence);
1217                 if (ret) {
1218                         dma_fence_put(fence);
1219                         return ret;
1220                 }
1221
1222                 conn_state->writeback_job->out_fence = fence;
1223         }
1224
1225         /*
1226          * Having this flag means user mode pends on event which will never
1227          * reach due to lack of at least one CRTC for signaling
1228          */
1229         if (c == 0 && (arg->flags & DRM_MODE_PAGE_FLIP_EVENT))
1230                 return -EINVAL;
1231
1232         return 0;
1233 }
1234
1235 static void complete_signaling(struct drm_device *dev,
1236                                struct drm_atomic_state *state,
1237                                struct drm_out_fence_state *fence_state,
1238                                unsigned int num_fences,
1239                                bool install_fds)
1240 {
1241         struct drm_crtc *crtc;
1242         struct drm_crtc_state *crtc_state;
1243         int i;
1244
1245         if (install_fds) {
1246                 for (i = 0; i < num_fences; i++)
1247                         fd_install(fence_state[i].fd,
1248                                    fence_state[i].sync_file->file);
1249
1250                 kfree(fence_state);
1251                 return;
1252         }
1253
1254         for_each_new_crtc_in_state(state, crtc, crtc_state, i) {
1255                 struct drm_pending_vblank_event *event = crtc_state->event;
1256                 /*
1257                  * Free the allocated event. drm_atomic_helper_setup_commit
1258                  * can allocate an event too, so only free it if it's ours
1259                  * to prevent a double free in drm_atomic_state_clear.
1260                  */
1261                 if (event && (event->base.fence || event->base.file_priv)) {
1262                         drm_event_cancel_free(dev, &event->base);
1263                         crtc_state->event = NULL;
1264                 }
1265         }
1266
1267         if (!fence_state)
1268                 return;
1269
1270         for (i = 0; i < num_fences; i++) {
1271                 if (fence_state[i].sync_file)
1272                         fput(fence_state[i].sync_file->file);
1273                 if (fence_state[i].fd >= 0)
1274                         put_unused_fd(fence_state[i].fd);
1275
1276                 /* If this fails log error to the user */
1277                 if (fence_state[i].out_fence_ptr &&
1278                     put_user(-1, fence_state[i].out_fence_ptr))
1279                         DRM_DEBUG_ATOMIC("Couldn't clear out_fence_ptr\n");
1280         }
1281
1282         kfree(fence_state);
1283 }
1284
1285 int drm_mode_atomic_ioctl(struct drm_device *dev,
1286                           void *data, struct drm_file *file_priv)
1287 {
1288         struct drm_mode_atomic *arg = data;
1289         uint32_t __user *objs_ptr = (uint32_t __user *)(unsigned long)(arg->objs_ptr);
1290         uint32_t __user *count_props_ptr = (uint32_t __user *)(unsigned long)(arg->count_props_ptr);
1291         uint32_t __user *props_ptr = (uint32_t __user *)(unsigned long)(arg->props_ptr);
1292         uint64_t __user *prop_values_ptr = (uint64_t __user *)(unsigned long)(arg->prop_values_ptr);
1293         unsigned int copied_objs, copied_props;
1294         struct drm_atomic_state *state;
1295         struct drm_modeset_acquire_ctx ctx;
1296         struct drm_out_fence_state *fence_state;
1297         int ret = 0;
1298         unsigned int i, j, num_fences;
1299
1300         /* disallow for drivers not supporting atomic: */
1301         if (!drm_core_check_feature(dev, DRIVER_ATOMIC))
1302                 return -EOPNOTSUPP;
1303
1304         /* disallow for userspace that has not enabled atomic cap (even
1305          * though this may be a bit overkill, since legacy userspace
1306          * wouldn't know how to call this ioctl)
1307          */
1308         if (!file_priv->atomic)
1309                 return -EINVAL;
1310
1311         if (arg->flags & ~DRM_MODE_ATOMIC_FLAGS)
1312                 return -EINVAL;
1313
1314         if (arg->reserved)
1315                 return -EINVAL;
1316
1317         if (arg->flags & DRM_MODE_PAGE_FLIP_ASYNC)
1318                 return -EINVAL;
1319
1320         /* can't test and expect an event at the same time. */
1321         if ((arg->flags & DRM_MODE_ATOMIC_TEST_ONLY) &&
1322                         (arg->flags & DRM_MODE_PAGE_FLIP_EVENT))
1323                 return -EINVAL;
1324
1325         state = drm_atomic_state_alloc(dev);
1326         if (!state)
1327                 return -ENOMEM;
1328
1329         drm_modeset_acquire_init(&ctx, DRM_MODESET_ACQUIRE_INTERRUPTIBLE);
1330         state->acquire_ctx = &ctx;
1331         state->allow_modeset = !!(arg->flags & DRM_MODE_ATOMIC_ALLOW_MODESET);
1332
1333 retry:
1334         copied_objs = 0;
1335         copied_props = 0;
1336         fence_state = NULL;
1337         num_fences = 0;
1338
1339         for (i = 0; i < arg->count_objs; i++) {
1340                 uint32_t obj_id, count_props;
1341                 struct drm_mode_object *obj;
1342
1343                 if (get_user(obj_id, objs_ptr + copied_objs)) {
1344                         ret = -EFAULT;
1345                         goto out;
1346                 }
1347
1348                 obj = drm_mode_object_find(dev, file_priv, obj_id, DRM_MODE_OBJECT_ANY);
1349                 if (!obj) {
1350                         ret = -ENOENT;
1351                         goto out;
1352                 }
1353
1354                 if (!obj->properties) {
1355                         drm_mode_object_put(obj);
1356                         ret = -ENOENT;
1357                         goto out;
1358                 }
1359
1360                 if (get_user(count_props, count_props_ptr + copied_objs)) {
1361                         drm_mode_object_put(obj);
1362                         ret = -EFAULT;
1363                         goto out;
1364                 }
1365
1366                 copied_objs++;
1367
1368                 for (j = 0; j < count_props; j++) {
1369                         uint32_t prop_id;
1370                         uint64_t prop_value;
1371                         struct drm_property *prop;
1372
1373                         if (get_user(prop_id, props_ptr + copied_props)) {
1374                                 drm_mode_object_put(obj);
1375                                 ret = -EFAULT;
1376                                 goto out;
1377                         }
1378
1379                         prop = drm_mode_obj_find_prop_id(obj, prop_id);
1380                         if (!prop) {
1381                                 drm_mode_object_put(obj);
1382                                 ret = -ENOENT;
1383                                 goto out;
1384                         }
1385
1386                         if (copy_from_user(&prop_value,
1387                                            prop_values_ptr + copied_props,
1388                                            sizeof(prop_value))) {
1389                                 drm_mode_object_put(obj);
1390                                 ret = -EFAULT;
1391                                 goto out;
1392                         }
1393
1394                         ret = drm_atomic_set_property(state, file_priv,
1395                                                       obj, prop, prop_value);
1396                         if (ret) {
1397                                 drm_mode_object_put(obj);
1398                                 goto out;
1399                         }
1400
1401                         copied_props++;
1402                 }
1403
1404                 drm_mode_object_put(obj);
1405         }
1406
1407         ret = prepare_signaling(dev, state, arg, file_priv, &fence_state,
1408                                 &num_fences);
1409         if (ret)
1410                 goto out;
1411
1412         if (arg->flags & DRM_MODE_ATOMIC_TEST_ONLY) {
1413                 ret = drm_atomic_check_only(state);
1414         } else if (arg->flags & DRM_MODE_ATOMIC_NONBLOCK) {
1415                 ret = drm_atomic_nonblocking_commit(state);
1416         } else {
1417                 if (drm_debug_enabled(DRM_UT_STATE))
1418                         drm_atomic_print_state(state);
1419
1420                 ret = drm_atomic_commit(state);
1421         }
1422
1423 out:
1424         complete_signaling(dev, state, fence_state, num_fences, !ret);
1425
1426         if (ret == -EDEADLK) {
1427                 drm_atomic_state_clear(state);
1428                 ret = drm_modeset_backoff(&ctx);
1429                 if (!ret)
1430                         goto retry;
1431         }
1432
1433         drm_atomic_state_put(state);
1434
1435         drm_modeset_drop_locks(&ctx);
1436         drm_modeset_acquire_fini(&ctx);
1437
1438         return ret;
1439 }