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                 drm_mode_convert_to_umode(&umode, mode);
  79                 state->mode_blob =
  80                         drm_property_create_blob(state->crtc->dev,
  81                                                  sizeof(umode),
  82                                                  &umode);
  83                 if (IS_ERR(state->mode_blob))
  84                         return PTR_ERR(state->mode_blob);
  85
  86                 drm_mode_copy(&state->mode, mode);
  87                 state->enable = true;
  88                 drm_dbg_atomic(crtc->dev,
  89                                "Set [MODE:%s] for [CRTC:%d:%s] state %p\n",
  90                                mode->name, crtc->base.id, crtc->name, state);
  91         } else {
  92                 memset(&state->mode, 0, sizeof(state->mode));
  93                 state->enable = false;
  94                 drm_dbg_atomic(crtc->dev,
  95                                "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_dbg_atomic(crtc->dev,
 134                                        "[CRTC:%d:%s] bad mode blob length: %zu\n",
 135                                        crtc->base.id, crtc->name,
 136                                        blob->length);
 137                         return -EINVAL;
 138                 }
 139
 140                 ret = drm_mode_convert_umode(crtc->dev,
 141                                              &state->mode, blob->data);
 142                 if (ret) {
 143                         drm_dbg_atomic(crtc->dev,
 144                                        "[CRTC:%d:%s] invalid mode (ret=%d, status=%s):\n",
 145                                        crtc->base.id, crtc->name,
 146                                        ret, drm_get_mode_status_name(state->mode.status));
 147                         drm_mode_debug_printmodeline(&state->mode);
 148                         return -EINVAL;
 149                 }
 150
 151                 state->mode_blob = drm_property_blob_get(blob);
 152                 state->enable = true;
 153                 drm_dbg_atomic(crtc->dev,
 154                                "Set [MODE:%s] for [CRTC:%d:%s] state %p\n",
 155                                state->mode.name, crtc->base.id, crtc->name,
 156                                state);
 157         } else {
 158                 state->enable = false;
 159                 drm_dbg_atomic(crtc->dev,
 160                                "Set [NOMODE] for [CRTC:%d:%s] state %p\n",
 161                                crtc->base.id, crtc->name, state);
 162         }
 163
 164         return 0;
 165 }
 166 EXPORT_SYMBOL(drm_atomic_set_mode_prop_for_crtc);
 167
 168 /**
 169  * drm_atomic_set_crtc_for_plane - set CRTC for plane
 170  * @plane_state: the plane whose incoming state to update
 171  * @crtc: CRTC to use for the plane
 172  *
 173  * Changing the assigned CRTC for a plane requires us to grab the lock and state
 174  * for the new CRTC, as needed. This function takes care of all these details
 175  * besides updating the pointer in the state object itself.
 176  *
 177  * Returns:
 178  * 0 on success or can fail with -EDEADLK or -ENOMEM. When the error is EDEADLK
 179  * then the w/w mutex code has detected a deadlock and the entire atomic
 180  * sequence must be restarted. All other errors are fatal.
 181  */
 182 int
 183 drm_atomic_set_crtc_for_plane(struct drm_plane_state *plane_state,
 184                               struct drm_crtc *crtc)
 185 {
 186         struct drm_plane *plane = plane_state->plane;
 187         struct drm_crtc_state *crtc_state;
 188         /* Nothing to do for same crtc*/
 189         if (plane_state->crtc == crtc)
 190                 return 0;
 191         if (plane_state->crtc) {
 192                 crtc_state = drm_atomic_get_crtc_state(plane_state->state,
 193                                                        plane_state->crtc);
 194                 if (WARN_ON(IS_ERR(crtc_state)))
 195                         return PTR_ERR(crtc_state);
 196
 197                 crtc_state->plane_mask &= ~drm_plane_mask(plane);
 198         }
 199
 200         plane_state->crtc = crtc;
 201
 202         if (crtc) {
 203                 crtc_state = drm_atomic_get_crtc_state(plane_state->state,
 204                                                        crtc);
 205                 if (IS_ERR(crtc_state))
 206                         return PTR_ERR(crtc_state);
 207                 crtc_state->plane_mask |= drm_plane_mask(plane);
 208         }
 209
 210         if (crtc)
 211                 drm_dbg_atomic(plane->dev,
 212                                "Link [PLANE:%d:%s] state %p to [CRTC:%d:%s]\n",
 213                                plane->base.id, plane->name, plane_state,
 214                                crtc->base.id, crtc->name);
 215         else
 216                 drm_dbg_atomic(plane->dev,
 217                                "Link [PLANE:%d:%s] state %p to [NOCRTC]\n",
 218                                plane->base.id, plane->name, plane_state);
 219
 220         return 0;
 221 }
 222 EXPORT_SYMBOL(drm_atomic_set_crtc_for_plane);
 223
 224 /**
 225  * drm_atomic_set_fb_for_plane - set framebuffer for plane
 226  * @plane_state: atomic state object for the plane
 227  * @fb: fb to use for the plane
 228  *
 229  * Changing the assigned framebuffer for a plane requires us to grab a reference
 230  * to the new fb and drop the reference to the old fb, if there is one. This
 231  * function takes care of all these details besides updating the pointer in the
 232  * state object itself.
 233  */
 234 void
 235 drm_atomic_set_fb_for_plane(struct drm_plane_state *plane_state,
 236                             struct drm_framebuffer *fb)
 237 {
 238         struct drm_plane *plane = plane_state->plane;
 239
 240         if (fb)
 241                 drm_dbg_atomic(plane->dev,
 242                                "Set [FB:%d] for [PLANE:%d:%s] state %p\n",
 243                                fb->base.id, plane->base.id, plane->name,
 244                                plane_state);
 245         else
 246                 drm_dbg_atomic(plane->dev,
 247                                "Set [NOFB] for [PLANE:%d:%s] state %p\n",
 248                                plane->base.id, plane->name, plane_state);
 249
 250         drm_framebuffer_assign(&plane_state->fb, fb);
 251 }
 252 EXPORT_SYMBOL(drm_atomic_set_fb_for_plane);
 253
 254 /**
 255  * drm_atomic_set_fence_for_plane - set fence for plane
 256  * @plane_state: atomic state object for the plane
 257  * @fence: dma_fence to use for the plane
 258  *
 259  * Helper to setup the plane_state fence in case it is not set yet.
 260  * By using this drivers doesn't need to worry if the user choose
 261  * implicit or explicit fencing.
 262  *
 263  * This function will not set the fence to the state if it was set
 264  * via explicit fencing interfaces on the atomic ioctl. In that case it will
 265  * drop the reference to the fence as we are not storing it anywhere.
 266  * Otherwise, if &drm_plane_state.fence is not set this function we just set it
 267  * with the received implicit fence. In both cases this function consumes a
 268  * reference for @fence.
 269  *
 270  * This way explicit fencing can be used to overrule implicit fencing, which is
 271  * important to make explicit fencing use-cases work: One example is using one
 272  * buffer for 2 screens with different refresh rates. Implicit fencing will
 273  * clamp rendering to the refresh rate of the slower screen, whereas explicit
 274  * fence allows 2 independent render and display loops on a single buffer. If a
 275  * driver allows obeys both implicit and explicit fences for plane updates, then
 276  * it will break all the benefits of explicit fencing.
 277  */
 278 void
 279 drm_atomic_set_fence_for_plane(struct drm_plane_state *plane_state,
 280                                struct dma_fence *fence)
 281 {
 282         if (plane_state->fence) {
 283                 dma_fence_put(fence);
 284                 return;
 285         }
 286
 287         plane_state->fence = fence;
 288 }
 289 EXPORT_SYMBOL(drm_atomic_set_fence_for_plane);
 290
 291 /**
 292  * drm_atomic_set_crtc_for_connector - set CRTC for connector
 293  * @conn_state: atomic state object for the connector
 294  * @crtc: CRTC to use for the connector
 295  *
 296  * Changing the assigned CRTC for a connector requires us to grab the lock and
 297  * state for the new CRTC, as needed. This function takes care of all these
 298  * details besides updating the pointer in the state object itself.
 299  *
 300  * Returns:
 301  * 0 on success or can fail with -EDEADLK or -ENOMEM. When the error is EDEADLK
 302  * then the w/w mutex code has detected a deadlock and the entire atomic
 303  * sequence must be restarted. All other errors are fatal.
 304  */
 305 int
 306 drm_atomic_set_crtc_for_connector(struct drm_connector_state *conn_state,
 307                                   struct drm_crtc *crtc)
 308 {
 309         struct drm_connector *connector = conn_state->connector;
 310         struct drm_crtc_state *crtc_state;
 311
 312         if (conn_state->crtc == crtc)
 313                 return 0;
 314
 315         if (conn_state->crtc) {
 316                 crtc_state = drm_atomic_get_new_crtc_state(conn_state->state,
 317                                                            conn_state->crtc);
 318
 319                 crtc_state->connector_mask &=
 320                         ~drm_connector_mask(conn_state->connector);
 321
 322                 drm_connector_put(conn_state->connector);
 323                 conn_state->crtc = NULL;
 324         }
 325
 326         if (crtc) {
 327                 crtc_state = drm_atomic_get_crtc_state(conn_state->state, crtc);
 328                 if (IS_ERR(crtc_state))
 329                         return PTR_ERR(crtc_state);
 330
 331                 crtc_state->connector_mask |=
 332                         drm_connector_mask(conn_state->connector);
 333
 334                 drm_connector_get(conn_state->connector);
 335                 conn_state->crtc = crtc;
 336
 337                 drm_dbg_atomic(connector->dev,
 338                                "Link [CONNECTOR:%d:%s] state %p to [CRTC:%d:%s]\n",
 339                                connector->base.id, connector->name,
 340                                conn_state, crtc->base.id, crtc->name);
 341         } else {
 342                 drm_dbg_atomic(connector->dev,
 343                                "Link [CONNECTOR:%d:%s] state %p to [NOCRTC]\n",
 344                                connector->base.id, connector->name,
 345                                conn_state);
 346         }
 347
 348         return 0;
 349 }
 350 EXPORT_SYMBOL(drm_atomic_set_crtc_for_connector);
 351
 352 static void set_out_fence_for_crtc(struct drm_atomic_state *state,
 353                                    struct drm_crtc *crtc, s32 __user *fence_ptr)
 354 {
 355         state->crtcs[drm_crtc_index(crtc)].out_fence_ptr = fence_ptr;
 356 }
 357
 358 static s32 __user *get_out_fence_for_crtc(struct drm_atomic_state *state,
 359                                           struct drm_crtc *crtc)
 360 {
 361         s32 __user *fence_ptr;
 362
 363         fence_ptr = state->crtcs[drm_crtc_index(crtc)].out_fence_ptr;
 364         state->crtcs[drm_crtc_index(crtc)].out_fence_ptr = NULL;
 365
 366         return fence_ptr;
 367 }
 368
 369 static int set_out_fence_for_connector(struct drm_atomic_state *state,
 370                                         struct drm_connector *connector,
 371                                         s32 __user *fence_ptr)
 372 {
 373         unsigned int index = drm_connector_index(connector);
 374
 375         if (!fence_ptr)
 376                 return 0;
 377
 378         if (put_user(-1, fence_ptr))
 379                 return -EFAULT;
 380
 381         state->connectors[index].out_fence_ptr = fence_ptr;
 382
 383         return 0;
 384 }
 385
 386 static s32 __user *get_out_fence_for_connector(struct drm_atomic_state *state,
 387                                                struct drm_connector *connector)
 388 {
 389         unsigned int index = drm_connector_index(connector);
 390         s32 __user *fence_ptr;
 391
 392         fence_ptr = state->connectors[index].out_fence_ptr;
 393         state->connectors[index].out_fence_ptr = NULL;
 394
 395         return fence_ptr;
 396 }
 397
 398 static int
 399 drm_atomic_replace_property_blob_from_id(struct drm_device *dev,
 400                                          struct drm_property_blob **blob,
 401                                          uint64_t blob_id,
 402                                          ssize_t expected_size,
 403                                          ssize_t expected_elem_size,
 404                                          bool *replaced)
 405 {
 406         struct drm_property_blob *new_blob = NULL;
 407
 408         if (blob_id != 0) {
 409                 new_blob = drm_property_lookup_blob(dev, blob_id);
 410                 if (new_blob == NULL)
 411                         return -EINVAL;
 412
 413                 if (expected_size > 0 &&
 414                     new_blob->length != expected_size) {
 415                         drm_property_blob_put(new_blob);
 416                         return -EINVAL;
 417                 }
 418                 if (expected_elem_size > 0 &&
 419                     new_blob->length % expected_elem_size != 0) {
 420                         drm_property_blob_put(new_blob);
 421                         return -EINVAL;
 422                 }
 423         }
 424
 425         *replaced |= drm_property_replace_blob(blob, new_blob);
 426         drm_property_blob_put(new_blob);
 427
 428         return 0;
 429 }
 430
 431 static int drm_atomic_crtc_set_property(struct drm_crtc *crtc,
 432                 struct drm_crtc_state *state, struct drm_property *property,
 433                 uint64_t val)
 434 {
 435         struct drm_device *dev = crtc->dev;
 436         struct drm_mode_config *config = &dev->mode_config;
 437         bool replaced = false;
 438         int ret;
 439
 440         if (property == config->prop_active)
 441                 state->active = val;
 442         else if (property == config->prop_mode_id) {
 443                 struct drm_property_blob *mode =
 444                         drm_property_lookup_blob(dev, val);
 445                 ret = drm_atomic_set_mode_prop_for_crtc(state, mode);
 446                 drm_property_blob_put(mode);
 447                 return ret;
 448         } else if (property == config->prop_vrr_enabled) {
 449                 state->vrr_enabled = val;
 450         } else if (property == config->degamma_lut_property) {
 451                 ret = drm_atomic_replace_property_blob_from_id(dev,
 452                                         &state->degamma_lut,
 453                                         val,
 454                                         -1, sizeof(struct drm_color_lut),
 455                                         &replaced);
 456                 state->color_mgmt_changed |= replaced;
 457                 return ret;
 458         } else if (property == config->ctm_property) {
 459                 ret = drm_atomic_replace_property_blob_from_id(dev,
 460                                         &state->ctm,
 461                                         val,
 462                                         sizeof(struct drm_color_ctm), -1,
 463                                         &replaced);
 464                 state->color_mgmt_changed |= replaced;
 465                 return ret;
 466         } else if (property == config->gamma_lut_property) {
 467                 ret = drm_atomic_replace_property_blob_from_id(dev,
 468                                         &state->gamma_lut,
 469                                         val,
 470                                         -1, sizeof(struct drm_color_lut),
 471                                         &replaced);
 472                 state->color_mgmt_changed |= replaced;
 473                 return ret;
 474         } else if (property == config->prop_out_fence_ptr) {
 475                 s32 __user *fence_ptr = u64_to_user_ptr(val);
 476
 477                 if (!fence_ptr)
 478                         return 0;
 479
 480                 if (put_user(-1, fence_ptr))
 481                         return -EFAULT;
 482
 483                 set_out_fence_for_crtc(state->state, crtc, fence_ptr);
 484         } else if (property == crtc->scaling_filter_property) {
 485                 state->scaling_filter = val;
 486         } else if (crtc->funcs->atomic_set_property) {
 487                 return crtc->funcs->atomic_set_property(crtc, state, property, val);
 488         } else {
 489                 drm_dbg_atomic(crtc->dev,
 490                                "[CRTC:%d:%s] unknown property [PROP:%d:%s]]\n",
 491                                crtc->base.id, crtc->name,
 492                                property->base.id, property->name);
 493                 return -EINVAL;
 494         }
 495
 496         return 0;
 497 }
 498
 499 static int
 500 drm_atomic_crtc_get_property(struct drm_crtc *crtc,
 501                 const struct drm_crtc_state *state,
 502                 struct drm_property *property, uint64_t *val)
 503 {
 504         struct drm_device *dev = crtc->dev;
 505         struct drm_mode_config *config = &dev->mode_config;
 506
 507         if (property == config->prop_active)
 508                 *val = drm_atomic_crtc_effectively_active(state);
 509         else if (property == config->prop_mode_id)
 510                 *val = (state->mode_blob) ? state->mode_blob->base.id : 0;
 511         else if (property == config->prop_vrr_enabled)
 512                 *val = state->vrr_enabled;
 513         else if (property == config->degamma_lut_property)
 514                 *val = (state->degamma_lut) ? state->degamma_lut->base.id : 0;
 515         else if (property == config->ctm_property)
 516                 *val = (state->ctm) ? state->ctm->base.id : 0;
 517         else if (property == config->gamma_lut_property)
 518                 *val = (state->gamma_lut) ? state->gamma_lut->base.id : 0;
 519         else if (property == config->prop_out_fence_ptr)
 520                 *val = 0;
 521         else if (property == crtc->scaling_filter_property)
 522                 *val = state->scaling_filter;
 523         else if (crtc->funcs->atomic_get_property)
 524                 return crtc->funcs->atomic_get_property(crtc, state, property, val);
 525         else
 526                 return -EINVAL;
 527
 528         return 0;
 529 }
 530
 531 static int drm_atomic_plane_set_property(struct drm_plane *plane,
 532                 struct drm_plane_state *state, struct drm_file *file_priv,
 533                 struct drm_property *property, uint64_t val)
 534 {
 535         struct drm_device *dev = plane->dev;
 536         struct drm_mode_config *config = &dev->mode_config;
 537         bool replaced = false;
 538         int ret;
 539
 540         if (property == config->prop_fb_id) {
 541                 struct drm_framebuffer *fb;
 542
 543                 fb = drm_framebuffer_lookup(dev, file_priv, val);
 544                 drm_atomic_set_fb_for_plane(state, fb);
 545                 if (fb)
 546                         drm_framebuffer_put(fb);
 547         } else if (property == config->prop_in_fence_fd) {
 548                 if (state->fence)
 549                         return -EINVAL;
 550
 551                 if (U642I64(val) == -1)
 552                         return 0;
 553
 554                 state->fence = sync_file_get_fence(val);
 555                 if (!state->fence)
 556                         return -EINVAL;
 557
 558         } else if (property == config->prop_crtc_id) {
 559                 struct drm_crtc *crtc = drm_crtc_find(dev, file_priv, val);
 560
 561                 if (val && !crtc)
 562                         return -EACCES;
 563                 return drm_atomic_set_crtc_for_plane(state, crtc);
 564         } else if (property == config->prop_crtc_x) {
 565                 state->crtc_x = U642I64(val);
 566         } else if (property == config->prop_crtc_y) {
 567                 state->crtc_y = U642I64(val);
 568         } else if (property == config->prop_crtc_w) {
 569                 state->crtc_w = val;
 570         } else if (property == config->prop_crtc_h) {
 571                 state->crtc_h = val;
 572         } else if (property == config->prop_src_x) {
 573                 state->src_x = val;
 574         } else if (property == config->prop_src_y) {
 575                 state->src_y = val;
 576         } else if (property == config->prop_src_w) {
 577                 state->src_w = val;
 578         } else if (property == config->prop_src_h) {
 579                 state->src_h = val;
 580         } else if (property == plane->alpha_property) {
 581                 state->alpha = val;
 582         } else if (property == plane->blend_mode_property) {
 583                 state->pixel_blend_mode = val;
 584         } else if (property == plane->rotation_property) {
 585                 if (!is_power_of_2(val & DRM_MODE_ROTATE_MASK)) {
 586                         drm_dbg_atomic(plane->dev,
 587                                        "[PLANE:%d:%s] bad rotation bitmask: 0x%llx\n",
 588                                        plane->base.id, plane->name, val);
 589                         return -EINVAL;
 590                 }
 591                 state->rotation = val;
 592         } else if (property == plane->zpos_property) {
 593                 state->zpos = val;
 594         } else if (property == plane->color_encoding_property) {
 595                 state->color_encoding = val;
 596         } else if (property == plane->color_range_property) {
 597                 state->color_range = val;
 598         } else if (property == config->prop_fb_damage_clips) {
 599                 ret = drm_atomic_replace_property_blob_from_id(dev,
 600                                         &state->fb_damage_clips,
 601                                         val,
 602                                         -1,
 603                                         sizeof(struct drm_rect),
 604                                         &replaced);
 605                 return ret;
 606         } else if (property == plane->scaling_filter_property) {
 607                 state->scaling_filter = val;
 608         } else if (plane->funcs->atomic_set_property) {
 609                 return plane->funcs->atomic_set_property(plane, state,
 610                                 property, val);
 611         } else {
 612                 drm_dbg_atomic(plane->dev,
 613                                "[PLANE:%d:%s] unknown property [PROP:%d:%s]]\n",
 614                                plane->base.id, plane->name,
 615                                property->base.id, property->name);
 616                 return -EINVAL;
 617         }
 618
 619         return 0;
 620 }
 621
 622 static int
 623 drm_atomic_plane_get_property(struct drm_plane *plane,
 624                 const struct drm_plane_state *state,
 625                 struct drm_property *property, uint64_t *val)
 626 {
 627         struct drm_device *dev = plane->dev;
 628         struct drm_mode_config *config = &dev->mode_config;
 629
 630         if (property == config->prop_fb_id) {
 631                 *val = (state->fb) ? state->fb->base.id : 0;
 632         } else if (property == config->prop_in_fence_fd) {
 633                 *val = -1;
 634         } else if (property == config->prop_crtc_id) {
 635                 *val = (state->crtc) ? state->crtc->base.id : 0;
 636         } else if (property == config->prop_crtc_x) {
 637                 *val = I642U64(state->crtc_x);
 638         } else if (property == config->prop_crtc_y) {
 639                 *val = I642U64(state->crtc_y);
 640         } else if (property == config->prop_crtc_w) {
 641                 *val = state->crtc_w;
 642         } else if (property == config->prop_crtc_h) {
 643                 *val = state->crtc_h;
 644         } else if (property == config->prop_src_x) {
 645                 *val = state->src_x;
 646         } else if (property == config->prop_src_y) {
 647                 *val = state->src_y;
 648         } else if (property == config->prop_src_w) {
 649                 *val = state->src_w;
 650         } else if (property == config->prop_src_h) {
 651                 *val = state->src_h;
 652         } else if (property == plane->alpha_property) {
 653                 *val = state->alpha;
 654         } else if (property == plane->blend_mode_property) {
 655                 *val = state->pixel_blend_mode;
 656         } else if (property == plane->rotation_property) {
 657                 *val = state->rotation;
 658         } else if (property == plane->zpos_property) {
 659                 *val = state->zpos;
 660         } else if (property == plane->color_encoding_property) {
 661                 *val = state->color_encoding;
 662         } else if (property == plane->color_range_property) {
 663                 *val = state->color_range;
 664         } else if (property == config->prop_fb_damage_clips) {
 665                 *val = (state->fb_damage_clips) ?
 666                         state->fb_damage_clips->base.id : 0;
 667         } else if (property == plane->scaling_filter_property) {
 668                 *val = state->scaling_filter;
 669         } else if (plane->funcs->atomic_get_property) {
 670                 return plane->funcs->atomic_get_property(plane, state, property, val);
 671         } else {
 672                 return -EINVAL;
 673         }
 674
 675         return 0;
 676 }
 677
 678 static int drm_atomic_set_writeback_fb_for_connector(
 679                 struct drm_connector_state *conn_state,
 680                 struct drm_framebuffer *fb)
 681 {
 682         int ret;
 683         struct drm_connector *conn = conn_state->connector;
 684
 685         ret = drm_writeback_set_fb(conn_state, fb);
 686         if (ret < 0)
 687                 return ret;
 688
 689         if (fb)
 690                 drm_dbg_atomic(conn->dev,
 691                                "Set [FB:%d] for connector state %p\n",
 692                                fb->base.id, conn_state);
 693         else
 694                 drm_dbg_atomic(conn->dev,
 695                                "Set [NOFB] for connector state %p\n",
 696                                conn_state);
 697
 698         return 0;
 699 }
 700
 701 static int drm_atomic_connector_set_property(struct drm_connector *connector,
 702                 struct drm_connector_state *state, struct drm_file *file_priv,
 703                 struct drm_property *property, uint64_t val)
 704 {
 705         struct drm_device *dev = connector->dev;
 706         struct drm_mode_config *config = &dev->mode_config;
 707         bool replaced = false;
 708         int ret;
 709
 710         if (property == config->prop_crtc_id) {
 711                 struct drm_crtc *crtc = drm_crtc_find(dev, file_priv, val);
 712
 713                 if (val && !crtc)
 714                         return -EACCES;
 715                 return drm_atomic_set_crtc_for_connector(state, crtc);
 716         } else if (property == config->dpms_property) {
 717                 /* setting DPMS property requires special handling, which
 718                  * is done in legacy setprop path for us.  Disallow (for
 719                  * now?) atomic writes to DPMS property:
 720                  */
 721                 return -EINVAL;
 722         } else if (property == config->tv_select_subconnector_property) {
 723                 state->tv.subconnector = val;
 724         } else if (property == config->tv_left_margin_property) {
 725                 state->tv.margins.left = val;
 726         } else if (property == config->tv_right_margin_property) {
 727                 state->tv.margins.right = val;
 728         } else if (property == config->tv_top_margin_property) {
 729                 state->tv.margins.top = val;
 730         } else if (property == config->tv_bottom_margin_property) {
 731                 state->tv.margins.bottom = val;
 732         } else if (property == config->tv_mode_property) {
 733                 state->tv.mode = val;
 734         } else if (property == config->tv_brightness_property) {
 735                 state->tv.brightness = val;
 736         } else if (property == config->tv_contrast_property) {
 737                 state->tv.contrast = val;
 738         } else if (property == config->tv_flicker_reduction_property) {
 739                 state->tv.flicker_reduction = val;
 740         } else if (property == config->tv_overscan_property) {
 741                 state->tv.overscan = val;
 742         } else if (property == config->tv_saturation_property) {
 743                 state->tv.saturation = val;
 744         } else if (property == config->tv_hue_property) {
 745                 state->tv.hue = val;
 746         } else if (property == config->link_status_property) {
 747                 /* Never downgrade from GOOD to BAD on userspace's request here,
 748                  * only hw issues can do that.
 749                  *
 750                  * For an atomic property the userspace doesn't need to be able
 751                  * to understand all the properties, but needs to be able to
 752                  * restore the state it wants on VT switch. So if the userspace
 753                  * tries to change the link_status from GOOD to BAD, driver
 754                  * silently rejects it and returns a 0. This prevents userspace
 755                  * from accidently breaking  the display when it restores the
 756                  * state.
 757                  */
 758                 if (state->link_status != DRM_LINK_STATUS_GOOD)
 759                         state->link_status = val;
 760         } else if (property == config->hdr_output_metadata_property) {
 761                 ret = drm_atomic_replace_property_blob_from_id(dev,
 762                                 &state->hdr_output_metadata,
 763                                 val,
 764                                 sizeof(struct hdr_output_metadata), -1,
 765                                 &replaced);
 766                 return ret;
 767         } else if (property == config->aspect_ratio_property) {
 768                 state->picture_aspect_ratio = val;
 769         } else if (property == config->content_type_property) {
 770                 state->content_type = val;
 771         } else if (property == connector->scaling_mode_property) {
 772                 state->scaling_mode = val;
 773         } else if (property == config->content_protection_property) {
 774                 if (val == DRM_MODE_CONTENT_PROTECTION_ENABLED) {
 775                         DRM_DEBUG_KMS("only drivers can set CP Enabled\n");
 776                         return -EINVAL;
 777                 }
 778                 state->content_protection = val;
 779         } else if (property == config->hdcp_content_type_property) {
 780                 state->hdcp_content_type = val;
 781         } else if (property == connector->colorspace_property) {
 782                 state->colorspace = val;
 783         } else if (property == config->writeback_fb_id_property) {
 784                 struct drm_framebuffer *fb;
 785                 int ret;
 786
 787                 fb = drm_framebuffer_lookup(dev, file_priv, val);
 788                 ret = drm_atomic_set_writeback_fb_for_connector(state, fb);
 789                 if (fb)
 790                         drm_framebuffer_put(fb);
 791                 return ret;
 792         } else if (property == config->writeback_out_fence_ptr_property) {
 793                 s32 __user *fence_ptr = u64_to_user_ptr(val);
 794
 795                 return set_out_fence_for_connector(state->state, connector,
 796                                                    fence_ptr);
 797         } else if (property == connector->max_bpc_property) {
 798                 state->max_requested_bpc = val;
 799         } else if (connector->funcs->atomic_set_property) {
 800                 return connector->funcs->atomic_set_property(connector,
 801                                 state, property, val);
 802         } else {
 803                 drm_dbg_atomic(connector->dev,
 804                                "[CONNECTOR:%d:%s] unknown property [PROP:%d:%s]]\n",
 805                                connector->base.id, connector->name,
 806                                property->base.id, property->name);
 807                 return -EINVAL;
 808         }
 809
 810         return 0;
 811 }
 812
 813 static int
 814 drm_atomic_connector_get_property(struct drm_connector *connector,
 815                 const struct drm_connector_state *state,
 816                 struct drm_property *property, uint64_t *val)
 817 {
 818         struct drm_device *dev = connector->dev;
 819         struct drm_mode_config *config = &dev->mode_config;
 820
 821         if (property == config->prop_crtc_id) {
 822                 *val = (state->crtc) ? state->crtc->base.id : 0;
 823         } else if (property == config->dpms_property) {
 824                 if (state->crtc && state->crtc->state->self_refresh_active)
 825                         *val = DRM_MODE_DPMS_ON;
 826                 else
 827                         *val = connector->dpms;
 828         } else if (property == config->tv_select_subconnector_property) {
 829                 *val = state->tv.subconnector;
 830         } else if (property == config->tv_left_margin_property) {
 831                 *val = state->tv.margins.left;
 832         } else if (property == config->tv_right_margin_property) {
 833                 *val = state->tv.margins.right;
 834         } else if (property == config->tv_top_margin_property) {
 835                 *val = state->tv.margins.top;
 836         } else if (property == config->tv_bottom_margin_property) {
 837                 *val = state->tv.margins.bottom;
 838         } else if (property == config->tv_mode_property) {
 839                 *val = state->tv.mode;
 840         } else if (property == config->tv_brightness_property) {
 841                 *val = state->tv.brightness;
 842         } else if (property == config->tv_contrast_property) {
 843                 *val = state->tv.contrast;
 844         } else if (property == config->tv_flicker_reduction_property) {
 845                 *val = state->tv.flicker_reduction;
 846         } else if (property == config->tv_overscan_property) {
 847                 *val = state->tv.overscan;
 848         } else if (property == config->tv_saturation_property) {
 849                 *val = state->tv.saturation;
 850         } else if (property == config->tv_hue_property) {
 851                 *val = state->tv.hue;
 852         } else if (property == config->link_status_property) {
 853                 *val = state->link_status;
 854         } else if (property == config->aspect_ratio_property) {
 855                 *val = state->picture_aspect_ratio;
 856         } else if (property == config->content_type_property) {
 857                 *val = state->content_type;
 858         } else if (property == connector->colorspace_property) {
 859                 *val = state->colorspace;
 860         } else if (property == connector->scaling_mode_property) {
 861                 *val = state->scaling_mode;
 862         } else if (property == config->hdr_output_metadata_property) {
 863                 *val = state->hdr_output_metadata ?
 864                         state->hdr_output_metadata->base.id : 0;
 865         } else if (property == config->content_protection_property) {
 866                 *val = state->content_protection;
 867         } else if (property == config->hdcp_content_type_property) {
 868                 *val = state->hdcp_content_type;
 869         } else if (property == config->writeback_fb_id_property) {
 870                 /* Writeback framebuffer is one-shot, write and forget */
 871                 *val = 0;
 872         } else if (property == config->writeback_out_fence_ptr_property) {
 873                 *val = 0;
 874         } else if (property == connector->max_bpc_property) {
 875                 *val = state->max_requested_bpc;
 876         } else if (connector->funcs->atomic_get_property) {
 877                 return connector->funcs->atomic_get_property(connector,
 878                                 state, property, val);
 879         } else {
 880                 return -EINVAL;
 881         }
 882
 883         return 0;
 884 }
 885
 886 int drm_atomic_get_property(struct drm_mode_object *obj,
 887                 struct drm_property *property, uint64_t *val)
 888 {
 889         struct drm_device *dev = property->dev;
 890         int ret;
 891
 892         switch (obj->type) {
 893         case DRM_MODE_OBJECT_CONNECTOR: {
 894                 struct drm_connector *connector = obj_to_connector(obj);
 895
 896                 WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
 897                 ret = drm_atomic_connector_get_property(connector,
 898                                 connector->state, property, val);
 899                 break;
 900         }
 901         case DRM_MODE_OBJECT_CRTC: {
 902                 struct drm_crtc *crtc = obj_to_crtc(obj);
 903
 904                 WARN_ON(!drm_modeset_is_locked(&crtc->mutex));
 905                 ret = drm_atomic_crtc_get_property(crtc,
 906                                 crtc->state, property, val);
 907                 break;
 908         }
 909         case DRM_MODE_OBJECT_PLANE: {
 910                 struct drm_plane *plane = obj_to_plane(obj);
 911
 912                 WARN_ON(!drm_modeset_is_locked(&plane->mutex));
 913                 ret = drm_atomic_plane_get_property(plane,
 914                                 plane->state, property, val);
 915                 break;
 916         }
 917         default:
 918                 ret = -EINVAL;
 919                 break;
 920         }
 921
 922         return ret;
 923 }
 924
 925 /*
 926  * The big monster ioctl
 927  */
 928
 929 static struct drm_pending_vblank_event *create_vblank_event(
 930                 struct drm_crtc *crtc, uint64_t user_data)
 931 {
 932         struct drm_pending_vblank_event *e = NULL;
 933
 934         e = kzalloc(sizeof *e, GFP_KERNEL);
 935         if (!e)
 936                 return NULL;
 937
 938         e->event.base.type = DRM_EVENT_FLIP_COMPLETE;
 939         e->event.base.length = sizeof(e->event);
 940         e->event.vbl.crtc_id = crtc->base.id;
 941         e->event.vbl.user_data = user_data;
 942
 943         return e;
 944 }
 945
 946 int drm_atomic_connector_commit_dpms(struct drm_atomic_state *state,
 947                                      struct drm_connector *connector,
 948                                      int mode)
 949 {
 950         struct drm_connector *tmp_connector;
 951         struct drm_connector_state *new_conn_state;
 952         struct drm_crtc *crtc;
 953         struct drm_crtc_state *crtc_state;
 954         int i, ret, old_mode = connector->dpms;
 955         bool active = false;
 956
 957         ret = drm_modeset_lock(&state->dev->mode_config.connection_mutex,
 958                                state->acquire_ctx);
 959         if (ret)
 960                 return ret;
 961
 962         if (mode != DRM_MODE_DPMS_ON)
 963                 mode = DRM_MODE_DPMS_OFF;
 964         connector->dpms = mode;
 965
 966         crtc = connector->state->crtc;
 967         if (!crtc)
 968                 goto out;
 969         ret = drm_atomic_add_affected_connectors(state, crtc);
 970         if (ret)
 971                 goto out;
 972
 973         crtc_state = drm_atomic_get_crtc_state(state, crtc);
 974         if (IS_ERR(crtc_state)) {
 975                 ret = PTR_ERR(crtc_state);
 976                 goto out;
 977         }
 978
 979         for_each_new_connector_in_state(state, tmp_connector, new_conn_state, i) {
 980                 if (new_conn_state->crtc != crtc)
 981                         continue;
 982                 if (tmp_connector->dpms == DRM_MODE_DPMS_ON) {
 983                         active = true;
 984                         break;
 985                 }
 986         }
 987
 988         crtc_state->active = active;
 989         ret = drm_atomic_commit(state);
 990 out:
 991         if (ret != 0)
 992                 connector->dpms = old_mode;
 993         return ret;
 994 }
 995
 996 int drm_atomic_set_property(struct drm_atomic_state *state,
 997                             struct drm_file *file_priv,
 998                             struct drm_mode_object *obj,
 999                             struct drm_property *prop,
1000                             uint64_t prop_value)
1001 {
1002         struct drm_mode_object *ref;
1003         int ret;
1004
1005         if (!drm_property_change_valid_get(prop, prop_value, &ref))
1006                 return -EINVAL;
1007
1008         switch (obj->type) {
1009         case DRM_MODE_OBJECT_CONNECTOR: {
1010                 struct drm_connector *connector = obj_to_connector(obj);
1011                 struct drm_connector_state *connector_state;
1012
1013                 connector_state = drm_atomic_get_connector_state(state, connector);
1014                 if (IS_ERR(connector_state)) {
1015                         ret = PTR_ERR(connector_state);
1016                         break;
1017                 }
1018
1019                 ret = drm_atomic_connector_set_property(connector,
1020                                 connector_state, file_priv,
1021                                 prop, prop_value);
1022                 break;
1023         }
1024         case DRM_MODE_OBJECT_CRTC: {
1025                 struct drm_crtc *crtc = obj_to_crtc(obj);
1026                 struct drm_crtc_state *crtc_state;
1027
1028                 crtc_state = drm_atomic_get_crtc_state(state, crtc);
1029                 if (IS_ERR(crtc_state)) {
1030                         ret = PTR_ERR(crtc_state);
1031                         break;
1032                 }
1033
1034                 ret = drm_atomic_crtc_set_property(crtc,
1035                                 crtc_state, prop, prop_value);
1036                 break;
1037         }
1038         case DRM_MODE_OBJECT_PLANE: {
1039                 struct drm_plane *plane = obj_to_plane(obj);
1040                 struct drm_plane_state *plane_state;
1041
1042                 plane_state = drm_atomic_get_plane_state(state, plane);
1043                 if (IS_ERR(plane_state)) {
1044                         ret = PTR_ERR(plane_state);
1045                         break;
1046                 }
1047
1048                 ret = drm_atomic_plane_set_property(plane,
1049                                 plane_state, file_priv,
1050                                 prop, prop_value);
1051                 break;
1052         }
1053         default:
1054                 ret = -EINVAL;
1055                 break;
1056         }
1057
1058         drm_property_change_valid_put(prop, ref);
1059         return ret;
1060 }
1061
1062 /**
1063  * DOC: explicit fencing properties
1064  *
1065  * Explicit fencing allows userspace to control the buffer synchronization
1066  * between devices. A Fence or a group of fences are transfered to/from
1067  * userspace using Sync File fds and there are two DRM properties for that.
1068  * IN_FENCE_FD on each DRM Plane to send fences to the kernel and
1069  * OUT_FENCE_PTR on each DRM CRTC to receive fences from the kernel.
1070  *
1071  * As a contrast, with implicit fencing the kernel keeps track of any
1072  * ongoing rendering, and automatically ensures that the atomic update waits
1073  * for any pending rendering to complete. For shared buffers represented with
1074  * a &struct dma_buf this is tracked in &struct dma_resv.
1075  * Implicit syncing is how Linux traditionally worked (e.g. DRI2/3 on X.org),
1076  * whereas explicit fencing is what Android wants.
1077  *
1078  * "IN_FENCE_FD”:
1079  *      Use this property to pass a fence that DRM should wait on before
1080  *      proceeding with the Atomic Commit request and show the framebuffer for
1081  *      the plane on the screen. The fence can be either a normal fence or a
1082  *      merged one, the sync_file framework will handle both cases and use a
1083  *      fence_array if a merged fence is received. Passing -1 here means no
1084  *      fences to wait on.
1085  *
1086  *      If the Atomic Commit request has the DRM_MODE_ATOMIC_TEST_ONLY flag
1087  *      it will only check if the Sync File is a valid one.
1088  *
1089  *      On the driver side the fence is stored on the @fence parameter of
1090  *      &struct drm_plane_state. Drivers which also support implicit fencing
1091  *      should set the implicit fence using drm_atomic_set_fence_for_plane(),
1092  *      to make sure there's consistent behaviour between drivers in precedence
1093  *      of implicit vs. explicit fencing.
1094  *
1095  * "OUT_FENCE_PTR”:
1096  *      Use this property to pass a file descriptor pointer to DRM. Once the
1097  *      Atomic Commit request call returns OUT_FENCE_PTR will be filled with
1098  *      the file descriptor number of a Sync File. This Sync File contains the
1099  *      CRTC fence that will be signaled when all framebuffers present on the
1100  *      Atomic Commit * request for that given CRTC are scanned out on the
1101  *      screen.
1102  *
1103  *      The Atomic Commit request fails if a invalid pointer is passed. If the
1104  *      Atomic Commit request fails for any other reason the out fence fd
1105  *      returned will be -1. On a Atomic Commit with the
1106  *      DRM_MODE_ATOMIC_TEST_ONLY flag the out fence will also be set to -1.
1107  *
1108  *      Note that out-fences don't have a special interface to drivers and are
1109  *      internally represented by a &struct drm_pending_vblank_event in struct
1110  *      &drm_crtc_state, which is also used by the nonblocking atomic commit
1111  *      helpers and for the DRM event handling for existing userspace.
1112  */
1113
1114 struct drm_out_fence_state {
1115         s32 __user *out_fence_ptr;
1116         struct sync_file *sync_file;
1117         int fd;
1118 };
1119
1120 static int setup_out_fence(struct drm_out_fence_state *fence_state,
1121                            struct dma_fence *fence)
1122 {
1123         fence_state->fd = get_unused_fd_flags(O_CLOEXEC);
1124         if (fence_state->fd < 0)
1125                 return fence_state->fd;
1126
1127         if (put_user(fence_state->fd, fence_state->out_fence_ptr))
1128                 return -EFAULT;
1129
1130         fence_state->sync_file = sync_file_create(fence);
1131         if (!fence_state->sync_file)
1132                 return -ENOMEM;
1133
1134         return 0;
1135 }
1136
1137 static int prepare_signaling(struct drm_device *dev,
1138                                   struct drm_atomic_state *state,
1139                                   struct drm_mode_atomic *arg,
1140                                   struct drm_file *file_priv,
1141                                   struct drm_out_fence_state **fence_state,
1142                                   unsigned int *num_fences)
1143 {
1144         struct drm_crtc *crtc;
1145         struct drm_crtc_state *crtc_state;
1146         struct drm_connector *conn;
1147         struct drm_connector_state *conn_state;
1148         int i, c = 0, ret;
1149
1150         if (arg->flags & DRM_MODE_ATOMIC_TEST_ONLY)
1151                 return 0;
1152
1153         for_each_new_crtc_in_state(state, crtc, crtc_state, i) {
1154                 s32 __user *fence_ptr;
1155
1156                 fence_ptr = get_out_fence_for_crtc(crtc_state->state, crtc);
1157
1158                 if (arg->flags & DRM_MODE_PAGE_FLIP_EVENT || fence_ptr) {
1159                         struct drm_pending_vblank_event *e;
1160
1161                         e = create_vblank_event(crtc, arg->user_data);
1162                         if (!e)
1163                                 return -ENOMEM;
1164
1165                         crtc_state->event = e;
1166                 }
1167
1168                 if (arg->flags & DRM_MODE_PAGE_FLIP_EVENT) {
1169                         struct drm_pending_vblank_event *e = crtc_state->event;
1170
1171                         if (!file_priv)
1172                                 continue;
1173
1174                         ret = drm_event_reserve_init(dev, file_priv, &e->base,
1175                                                      &e->event.base);
1176                         if (ret) {
1177                                 kfree(e);
1178                                 crtc_state->event = NULL;
1179                                 return ret;
1180                         }
1181                 }
1182
1183                 if (fence_ptr) {
1184                         struct dma_fence *fence;
1185                         struct drm_out_fence_state *f;
1186
1187                         f = krealloc(*fence_state, sizeof(**fence_state) *
1188                                      (*num_fences + 1), GFP_KERNEL);
1189                         if (!f)
1190                                 return -ENOMEM;
1191
1192                         memset(&f[*num_fences], 0, sizeof(*f));
1193
1194                         f[*num_fences].out_fence_ptr = fence_ptr;
1195                         *fence_state = f;
1196
1197                         fence = drm_crtc_create_fence(crtc);
1198                         if (!fence)
1199                                 return -ENOMEM;
1200
1201                         ret = setup_out_fence(&f[(*num_fences)++], fence);
1202                         if (ret) {
1203                                 dma_fence_put(fence);
1204                                 return ret;
1205                         }
1206
1207                         crtc_state->event->base.fence = fence;
1208                 }
1209
1210                 c++;
1211         }
1212
1213         for_each_new_connector_in_state(state, conn, conn_state, i) {
1214                 struct drm_writeback_connector *wb_conn;
1215                 struct drm_out_fence_state *f;
1216                 struct dma_fence *fence;
1217                 s32 __user *fence_ptr;
1218
1219                 if (!conn_state->writeback_job)
1220                         continue;
1221
1222                 fence_ptr = get_out_fence_for_connector(state, conn);
1223                 if (!fence_ptr)
1224                         continue;
1225
1226                 f = krealloc(*fence_state, sizeof(**fence_state) *
1227                              (*num_fences + 1), GFP_KERNEL);
1228                 if (!f)
1229                         return -ENOMEM;
1230
1231                 memset(&f[*num_fences], 0, sizeof(*f));
1232
1233                 f[*num_fences].out_fence_ptr = fence_ptr;
1234                 *fence_state = f;
1235
1236                 wb_conn = drm_connector_to_writeback(conn);
1237                 fence = drm_writeback_get_out_fence(wb_conn);
1238                 if (!fence)
1239                         return -ENOMEM;
1240
1241                 ret = setup_out_fence(&f[(*num_fences)++], fence);
1242                 if (ret) {
1243                         dma_fence_put(fence);
1244                         return ret;
1245                 }
1246
1247                 conn_state->writeback_job->out_fence = fence;
1248         }
1249
1250         /*
1251          * Having this flag means user mode pends on event which will never
1252          * reach due to lack of at least one CRTC for signaling
1253          */
1254         if (c == 0 && (arg->flags & DRM_MODE_PAGE_FLIP_EVENT))
1255                 return -EINVAL;
1256
1257         return 0;
1258 }
1259
1260 static void complete_signaling(struct drm_device *dev,
1261                                struct drm_atomic_state *state,
1262                                struct drm_out_fence_state *fence_state,
1263                                unsigned int num_fences,
1264                                bool install_fds)
1265 {
1266         struct drm_crtc *crtc;
1267         struct drm_crtc_state *crtc_state;
1268         int i;
1269
1270         if (install_fds) {
1271                 for (i = 0; i < num_fences; i++)
1272                         fd_install(fence_state[i].fd,
1273                                    fence_state[i].sync_file->file);
1274
1275                 kfree(fence_state);
1276                 return;
1277         }
1278
1279         for_each_new_crtc_in_state(state, crtc, crtc_state, i) {
1280                 struct drm_pending_vblank_event *event = crtc_state->event;
1281                 /*
1282                  * Free the allocated event. drm_atomic_helper_setup_commit
1283                  * can allocate an event too, so only free it if it's ours
1284                  * to prevent a double free in drm_atomic_state_clear.
1285                  */
1286                 if (event && (event->base.fence || event->base.file_priv)) {
1287                         drm_event_cancel_free(dev, &event->base);
1288                         crtc_state->event = NULL;
1289                 }
1290         }
1291
1292         if (!fence_state)
1293                 return;
1294
1295         for (i = 0; i < num_fences; i++) {
1296                 if (fence_state[i].sync_file)
1297                         fput(fence_state[i].sync_file->file);
1298                 if (fence_state[i].fd >= 0)
1299                         put_unused_fd(fence_state[i].fd);
1300
1301                 /* If this fails log error to the user */
1302                 if (fence_state[i].out_fence_ptr &&
1303                     put_user(-1, fence_state[i].out_fence_ptr))
1304                         drm_dbg_atomic(dev, "Couldn't clear out_fence_ptr\n");
1305         }
1306
1307         kfree(fence_state);
1308 }
1309
1310 int drm_mode_atomic_ioctl(struct drm_device *dev,
1311                           void *data, struct drm_file *file_priv)
1312 {
1313         struct drm_mode_atomic *arg = data;
1314         uint32_t __user *objs_ptr = (uint32_t __user *)(unsigned long)(arg->objs_ptr);
1315         uint32_t __user *count_props_ptr = (uint32_t __user *)(unsigned long)(arg->count_props_ptr);
1316         uint32_t __user *props_ptr = (uint32_t __user *)(unsigned long)(arg->props_ptr);
1317         uint64_t __user *prop_values_ptr = (uint64_t __user *)(unsigned long)(arg->prop_values_ptr);
1318         unsigned int copied_objs, copied_props;
1319         struct drm_atomic_state *state;
1320         struct drm_modeset_acquire_ctx ctx;
1321         struct drm_out_fence_state *fence_state;
1322         int ret = 0;
1323         unsigned int i, j, num_fences;
1324
1325         /* disallow for drivers not supporting atomic: */
1326         if (!drm_core_check_feature(dev, DRIVER_ATOMIC))
1327                 return -EOPNOTSUPP;
1328
1329         /* disallow for userspace that has not enabled atomic cap (even
1330          * though this may be a bit overkill, since legacy userspace
1331          * wouldn't know how to call this ioctl)
1332          */
1333         if (!file_priv->atomic) {
1334                 drm_dbg_atomic(dev,
1335                                "commit failed: atomic cap not enabled\n");
1336                 return -EINVAL;
1337         }
1338
1339         if (arg->flags & ~DRM_MODE_ATOMIC_FLAGS) {
1340                 drm_dbg_atomic(dev, "commit failed: invalid flag\n");
1341                 return -EINVAL;
1342         }
1343
1344         if (arg->reserved) {
1345                 drm_dbg_atomic(dev, "commit failed: reserved field set\n");
1346                 return -EINVAL;
1347         }
1348
1349         if (arg->flags & DRM_MODE_PAGE_FLIP_ASYNC) {
1350                 drm_dbg_atomic(dev,
1351                                "commit failed: invalid flag DRM_MODE_PAGE_FLIP_ASYNC\n");
1352                 return -EINVAL;
1353         }
1354
1355         /* can't test and expect an event at the same time. */
1356         if ((arg->flags & DRM_MODE_ATOMIC_TEST_ONLY) &&
1357                         (arg->flags & DRM_MODE_PAGE_FLIP_EVENT)) {
1358                 drm_dbg_atomic(dev,
1359                                "commit failed: page-flip event requested with test-only commit\n");
1360                 return -EINVAL;
1361         }
1362
1363         state = drm_atomic_state_alloc(dev);
1364         if (!state)
1365                 return -ENOMEM;
1366
1367         drm_modeset_acquire_init(&ctx, DRM_MODESET_ACQUIRE_INTERRUPTIBLE);
1368         state->acquire_ctx = &ctx;
1369         state->allow_modeset = !!(arg->flags & DRM_MODE_ATOMIC_ALLOW_MODESET);
1370
1371 retry:
1372         copied_objs = 0;
1373         copied_props = 0;
1374         fence_state = NULL;
1375         num_fences = 0;
1376
1377         for (i = 0; i < arg->count_objs; i++) {
1378                 uint32_t obj_id, count_props;
1379                 struct drm_mode_object *obj;
1380
1381                 if (get_user(obj_id, objs_ptr + copied_objs)) {
1382                         ret = -EFAULT;
1383                         goto out;
1384                 }
1385
1386                 obj = drm_mode_object_find(dev, file_priv, obj_id, DRM_MODE_OBJECT_ANY);
1387                 if (!obj) {
1388                         ret = -ENOENT;
1389                         goto out;
1390                 }
1391
1392                 if (!obj->properties) {
1393                         drm_mode_object_put(obj);
1394                         ret = -ENOENT;
1395                         goto out;
1396                 }
1397
1398                 if (get_user(count_props, count_props_ptr + copied_objs)) {
1399                         drm_mode_object_put(obj);
1400                         ret = -EFAULT;
1401                         goto out;
1402                 }
1403
1404                 copied_objs++;
1405
1406                 for (j = 0; j < count_props; j++) {
1407                         uint32_t prop_id;
1408                         uint64_t prop_value;
1409                         struct drm_property *prop;
1410
1411                         if (get_user(prop_id, props_ptr + copied_props)) {
1412                                 drm_mode_object_put(obj);
1413                                 ret = -EFAULT;
1414                                 goto out;
1415                         }
1416
1417                         prop = drm_mode_obj_find_prop_id(obj, prop_id);
1418                         if (!prop) {
1419                                 drm_mode_object_put(obj);
1420                                 ret = -ENOENT;
1421                                 goto out;
1422                         }
1423
1424                         if (copy_from_user(&prop_value,
1425                                            prop_values_ptr + copied_props,
1426                                            sizeof(prop_value))) {
1427                                 drm_mode_object_put(obj);
1428                                 ret = -EFAULT;
1429                                 goto out;
1430                         }
1431
1432                         ret = drm_atomic_set_property(state, file_priv,
1433                                                       obj, prop, prop_value);
1434                         if (ret) {
1435                                 drm_mode_object_put(obj);
1436                                 goto out;
1437                         }
1438
1439                         copied_props++;
1440                 }
1441
1442                 drm_mode_object_put(obj);
1443         }
1444
1445         ret = prepare_signaling(dev, state, arg, file_priv, &fence_state,
1446                                 &num_fences);
1447         if (ret)
1448                 goto out;
1449
1450         if (arg->flags & DRM_MODE_ATOMIC_TEST_ONLY) {
1451                 ret = drm_atomic_check_only(state);
1452         } else if (arg->flags & DRM_MODE_ATOMIC_NONBLOCK) {
1453                 ret = drm_atomic_nonblocking_commit(state);
1454         } else {
1455                 if (drm_debug_enabled(DRM_UT_STATE))
1456                         drm_atomic_print_state(state);
1457
1458                 ret = drm_atomic_commit(state);
1459         }
1460
1461 out:
1462         complete_signaling(dev, state, fence_state, num_fences, !ret);
1463
1464         if (ret == -EDEADLK) {
1465                 drm_atomic_state_clear(state);
1466                 ret = drm_modeset_backoff(&ctx);
1467                 if (!ret)
1468                         goto retry;
1469         }
1470
1471         drm_atomic_state_put(state);
1472
1473         drm_modeset_drop_locks(&ctx);
1474         drm_modeset_acquire_fini(&ctx);
1475
1476         return ret;
1477 }