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  * Copyright (c) 2020, The Linux Foundation. All rights reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included in
  15  * all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  21  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  22  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  23  * OTHER DEALINGS IN THE SOFTWARE.
  24  *
  25  * Authors:
  26  * Rob Clark <robdclark@gmail.com>
  27  * Daniel Vetter <daniel.vetter@ffwll.ch>
  28  */
  29
  30 #include <drm/drm_atomic_uapi.h>
  31 #include <drm/drm_atomic.h>
  32 #include <drm/drm_print.h>
  33 #include <drm/drm_drv.h>
  34 #include <drm/drm_writeback.h>
  35 #include <drm/drm_vblank.h>
  36
  37 #include <linux/dma-fence.h>
  38 #include <linux/uaccess.h>
  39 #include <linux/sync_file.h>
  40 #include <linux/file.h>
  41
  42 #include "drm_crtc_internal.h"
  43
  44 /**
  45  * DOC: overview
  46  *
  47  * This file contains the marshalling and demarshalling glue for the atomic UAPI
  48  * in all its forms: The monster ATOMIC IOCTL itself, code for GET_PROPERTY and
  49  * SET_PROPERTY IOCTLs. Plus interface functions for compatibility helpers and
  50  * drivers which have special needs to construct their own atomic updates, e.g.
  51  * for load detect or similar.
  52  */
  53
  54 /**
  55  * drm_atomic_set_mode_for_crtc - set mode for CRTC
  56  * @state: the CRTC whose incoming state to update
  57  * @mode: kernel-internal mode to use for the CRTC, or NULL to disable
  58  *
  59  * Set a mode (originating from the kernel) on the desired CRTC state and update
  60  * the enable property.
  61  *
  62  * RETURNS:
  63  * Zero on success, error code on failure. Cannot return -EDEADLK.
  64  */
  65 int drm_atomic_set_mode_for_crtc(struct drm_crtc_state *state,
  66                                  const struct drm_display_mode *mode)
  67 {
  68         struct drm_crtc *crtc = state->crtc;
  69         struct drm_mode_modeinfo umode;
  70
  71         /* Early return for no change. */
  72         if (mode && memcmp(&state->mode, mode, sizeof(*mode)) == 0)
  73                 return 0;
  74
  75         drm_property_blob_put(state->mode_blob);
  76         state->mode_blob = NULL;
  77
  78         if (mode) {
  79                 drm_mode_convert_to_umode(&umode, mode);
  80                 state->mode_blob =
  81                         drm_property_create_blob(state->crtc->dev,
  82                                                  sizeof(umode),
  83                                                  &umode);
  84                 if (IS_ERR(state->mode_blob))
  85                         return PTR_ERR(state->mode_blob);
  86
  87                 drm_mode_copy(&state->mode, mode);
  88                 state->enable = true;
  89                 drm_dbg_atomic(crtc->dev,
  90                                "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_dbg_atomic(crtc->dev,
  96                                "Set [NOMODE] for [CRTC:%d:%s] state %p\n",
  97                                crtc->base.id, crtc->name, state);
  98         }
  99
 100         return 0;
 101 }
 102 EXPORT_SYMBOL(drm_atomic_set_mode_for_crtc);
 103
 104 /**
 105  * drm_atomic_set_mode_prop_for_crtc - set mode for CRTC
 106  * @state: the CRTC whose incoming state to update
 107  * @blob: pointer to blob property to use for mode
 108  *
 109  * Set a mode (originating from a blob property) on the desired CRTC state.
 110  * This function will take a reference on the blob property for the CRTC state,
 111  * and release the reference held on the state's existing mode property, if any
 112  * was set.
 113  *
 114  * RETURNS:
 115  * Zero on success, error code on failure. Cannot return -EDEADLK.
 116  */
 117 int drm_atomic_set_mode_prop_for_crtc(struct drm_crtc_state *state,
 118                                       struct drm_property_blob *blob)
 119 {
 120         struct drm_crtc *crtc = state->crtc;
 121
 122         if (blob == state->mode_blob)
 123                 return 0;
 124
 125         drm_property_blob_put(state->mode_blob);
 126         state->mode_blob = NULL;
 127
 128         memset(&state->mode, 0, sizeof(state->mode));
 129
 130         if (blob) {
 131                 int ret;
 132
 133                 if (blob->length != sizeof(struct drm_mode_modeinfo)) {
 134                         drm_dbg_atomic(crtc->dev,
 135                                        "[CRTC:%d:%s] bad mode blob length: %zu\n",
 136                                        crtc->base.id, crtc->name,
 137                                        blob->length);
 138                         return -EINVAL;
 139                 }
 140
 141                 ret = drm_mode_convert_umode(crtc->dev,
 142                                              &state->mode, blob->data);
 143                 if (ret) {
 144                         drm_dbg_atomic(crtc->dev,
 145                                        "[CRTC:%d:%s] invalid mode (ret=%d, status=%s):\n",
 146                                        crtc->base.id, crtc->name,
 147                                        ret, drm_get_mode_status_name(state->mode.status));
 148                         drm_mode_debug_printmodeline(&state->mode);
 149                         return -EINVAL;
 150                 }
 151
 152                 state->mode_blob = drm_property_blob_get(blob);
 153                 state->enable = true;
 154                 drm_dbg_atomic(crtc->dev,
 155                                "Set [MODE:%s] for [CRTC:%d:%s] state %p\n",
 156                                state->mode.name, crtc->base.id, crtc->name,
 157                                state);
 158         } else {
 159                 state->enable = false;
 160                 drm_dbg_atomic(crtc->dev,
 161                                "Set [NOMODE] for [CRTC:%d:%s] state %p\n",
 162                                crtc->base.id, crtc->name, state);
 163         }
 164
 165         return 0;
 166 }
 167 EXPORT_SYMBOL(drm_atomic_set_mode_prop_for_crtc);
 168
 169 /**
 170  * drm_atomic_set_crtc_for_plane - set CRTC for plane
 171  * @plane_state: the plane whose incoming state to update
 172  * @crtc: CRTC to use for the plane
 173  *
 174  * Changing the assigned CRTC for a plane requires us to grab the lock and state
 175  * for the new CRTC, as needed. This function takes care of all these details
 176  * besides updating the pointer in the state object itself.
 177  *
 178  * Returns:
 179  * 0 on success or can fail with -EDEADLK or -ENOMEM. When the error is EDEADLK
 180  * then the w/w mutex code has detected a deadlock and the entire atomic
 181  * sequence must be restarted. All other errors are fatal.
 182  */
 183 int
 184 drm_atomic_set_crtc_for_plane(struct drm_plane_state *plane_state,
 185                               struct drm_crtc *crtc)
 186 {
 187         struct drm_plane *plane = plane_state->plane;
 188         struct drm_crtc_state *crtc_state;
 189         /* Nothing to do for same crtc*/
 190         if (plane_state->crtc == crtc)
 191                 return 0;
 192         if (plane_state->crtc) {
 193                 crtc_state = drm_atomic_get_crtc_state(plane_state->state,
 194                                                        plane_state->crtc);
 195                 if (WARN_ON(IS_ERR(crtc_state)))
 196                         return PTR_ERR(crtc_state);
 197
 198                 crtc_state->plane_mask &= ~drm_plane_mask(plane);
 199         }
 200
 201         plane_state->crtc = crtc;
 202
 203         if (crtc) {
 204                 crtc_state = drm_atomic_get_crtc_state(plane_state->state,
 205                                                        crtc);
 206                 if (IS_ERR(crtc_state))
 207                         return PTR_ERR(crtc_state);
 208                 crtc_state->plane_mask |= drm_plane_mask(plane);
 209         }
 210
 211         if (crtc)
 212                 drm_dbg_atomic(plane->dev,
 213                                "Link [PLANE:%d:%s] state %p to [CRTC:%d:%s]\n",
 214                                plane->base.id, plane->name, plane_state,
 215                                crtc->base.id, crtc->name);
 216         else
 217                 drm_dbg_atomic(plane->dev,
 218                                "Link [PLANE:%d:%s] state %p to [NOCRTC]\n",
 219                                plane->base.id, plane->name, plane_state);
 220
 221         return 0;
 222 }
 223 EXPORT_SYMBOL(drm_atomic_set_crtc_for_plane);
 224
 225 /**
 226  * drm_atomic_set_fb_for_plane - set framebuffer for plane
 227  * @plane_state: atomic state object for the plane
 228  * @fb: fb to use for the plane
 229  *
 230  * Changing the assigned framebuffer for a plane requires us to grab a reference
 231  * to the new fb and drop the reference to the old fb, if there is one. This
 232  * function takes care of all these details besides updating the pointer in the
 233  * state object itself.
 234  */
 235 void
 236 drm_atomic_set_fb_for_plane(struct drm_plane_state *plane_state,
 237                             struct drm_framebuffer *fb)
 238 {
 239         struct drm_plane *plane = plane_state->plane;
 240
 241         if (fb)
 242                 drm_dbg_atomic(plane->dev,
 243                                "Set [FB:%d] for [PLANE:%d:%s] state %p\n",
 244                                fb->base.id, plane->base.id, plane->name,
 245                                plane_state);
 246         else
 247                 drm_dbg_atomic(plane->dev,
 248                                "Set [NOFB] for [PLANE:%d:%s] state %p\n",
 249                                plane->base.id, plane->name, plane_state);
 250
 251         drm_framebuffer_assign(&plane_state->fb, fb);
 252 }
 253 EXPORT_SYMBOL(drm_atomic_set_fb_for_plane);
 254
 255 /**
 256  * drm_atomic_set_fence_for_plane - set fence for plane
 257  * @plane_state: atomic state object for the plane
 258  * @fence: dma_fence to use for the plane
 259  *
 260  * Helper to setup the plane_state fence in case it is not set yet.
 261  * By using this drivers doesn't need to worry if the user choose
 262  * implicit or explicit fencing.
 263  *
 264  * This function will not set the fence to the state if it was set
 265  * via explicit fencing interfaces on the atomic ioctl. In that case it will
 266  * drop the reference to the fence as we are not storing it anywhere.
 267  * Otherwise, if &drm_plane_state.fence is not set this function we just set it
 268  * with the received implicit fence. In both cases this function consumes a
 269  * reference for @fence.
 270  *
 271  * This way explicit fencing can be used to overrule implicit fencing, which is
 272  * important to make explicit fencing use-cases work: One example is using one
 273  * buffer for 2 screens with different refresh rates. Implicit fencing will
 274  * clamp rendering to the refresh rate of the slower screen, whereas explicit
 275  * fence allows 2 independent render and display loops on a single buffer. If a
 276  * driver allows obeys both implicit and explicit fences for plane updates, then
 277  * it will break all the benefits of explicit fencing.
 278  */
 279 void
 280 drm_atomic_set_fence_for_plane(struct drm_plane_state *plane_state,
 281                                struct dma_fence *fence)
 282 {
 283         if (plane_state->fence) {
 284                 dma_fence_put(fence);
 285                 return;
 286         }
 287
 288         plane_state->fence = fence;
 289 }
 290 EXPORT_SYMBOL(drm_atomic_set_fence_for_plane);
 291
 292 /**
 293  * drm_atomic_set_crtc_for_connector - set CRTC for connector
 294  * @conn_state: atomic state object for the connector
 295  * @crtc: CRTC to use for the connector
 296  *
 297  * Changing the assigned CRTC for a connector requires us to grab the lock and
 298  * state for the new CRTC, as needed. This function takes care of all these
 299  * details besides updating the pointer in the state object itself.
 300  *
 301  * Returns:
 302  * 0 on success or can fail with -EDEADLK or -ENOMEM. When the error is EDEADLK
 303  * then the w/w mutex code has detected a deadlock and the entire atomic
 304  * sequence must be restarted. All other errors are fatal.
 305  */
 306 int
 307 drm_atomic_set_crtc_for_connector(struct drm_connector_state *conn_state,
 308                                   struct drm_crtc *crtc)
 309 {
 310         struct drm_connector *connector = conn_state->connector;
 311         struct drm_crtc_state *crtc_state;
 312
 313         if (conn_state->crtc == crtc)
 314                 return 0;
 315
 316         if (conn_state->crtc) {
 317                 crtc_state = drm_atomic_get_new_crtc_state(conn_state->state,
 318                                                            conn_state->crtc);
 319
 320                 crtc_state->connector_mask &=
 321                         ~drm_connector_mask(conn_state->connector);
 322
 323                 drm_connector_put(conn_state->connector);
 324                 conn_state->crtc = NULL;
 325         }
 326
 327         if (crtc) {
 328                 crtc_state = drm_atomic_get_crtc_state(conn_state->state, crtc);
 329                 if (IS_ERR(crtc_state))
 330                         return PTR_ERR(crtc_state);
 331
 332                 crtc_state->connector_mask |=
 333                         drm_connector_mask(conn_state->connector);
 334
 335                 drm_connector_get(conn_state->connector);
 336                 conn_state->crtc = crtc;
 337
 338                 drm_dbg_atomic(connector->dev,
 339                                "Link [CONNECTOR:%d:%s] state %p to [CRTC:%d:%s]\n",
 340                                connector->base.id, connector->name,
 341                                conn_state, crtc->base.id, crtc->name);
 342         } else {
 343                 drm_dbg_atomic(connector->dev,
 344                                "Link [CONNECTOR:%d:%s] state %p to [NOCRTC]\n",
 345                                connector->base.id, connector->name,
 346                                conn_state);
 347         }
 348
 349         return 0;
 350 }
 351 EXPORT_SYMBOL(drm_atomic_set_crtc_for_connector);
 352
 353 static void set_out_fence_for_crtc(struct drm_atomic_state *state,
 354                                    struct drm_crtc *crtc, s32 __user *fence_ptr)
 355 {
 356         state->crtcs[drm_crtc_index(crtc)].out_fence_ptr = fence_ptr;
 357 }
 358
 359 static s32 __user *get_out_fence_for_crtc(struct drm_atomic_state *state,
 360                                           struct drm_crtc *crtc)
 361 {
 362         s32 __user *fence_ptr;
 363
 364         fence_ptr = state->crtcs[drm_crtc_index(crtc)].out_fence_ptr;
 365         state->crtcs[drm_crtc_index(crtc)].out_fence_ptr = NULL;
 366
 367         return fence_ptr;
 368 }
 369
 370 static int set_out_fence_for_connector(struct drm_atomic_state *state,
 371                                         struct drm_connector *connector,
 372                                         s32 __user *fence_ptr)
 373 {
 374         unsigned int index = drm_connector_index(connector);
 375
 376         if (!fence_ptr)
 377                 return 0;
 378
 379         if (put_user(-1, fence_ptr))
 380                 return -EFAULT;
 381
 382         state->connectors[index].out_fence_ptr = fence_ptr;
 383
 384         return 0;
 385 }
 386
 387 static s32 __user *get_out_fence_for_connector(struct drm_atomic_state *state,
 388                                                struct drm_connector *connector)
 389 {
 390         unsigned int index = drm_connector_index(connector);
 391         s32 __user *fence_ptr;
 392
 393         fence_ptr = state->connectors[index].out_fence_ptr;
 394         state->connectors[index].out_fence_ptr = NULL;
 395
 396         return fence_ptr;
 397 }
 398
 399 static int
 400 drm_atomic_replace_property_blob_from_id(struct drm_device *dev,
 401                                          struct drm_property_blob **blob,
 402                                          uint64_t blob_id,
 403                                          ssize_t expected_size,
 404                                          ssize_t expected_elem_size,
 405                                          bool *replaced)
 406 {
 407         struct drm_property_blob *new_blob = NULL;
 408
 409         if (blob_id != 0) {
 410                 new_blob = drm_property_lookup_blob(dev, blob_id);
 411                 if (new_blob == NULL)
 412                         return -EINVAL;
 413
 414                 if (expected_size > 0 &&
 415                     new_blob->length != expected_size) {
 416                         drm_property_blob_put(new_blob);
 417                         return -EINVAL;
 418                 }
 419                 if (expected_elem_size > 0 &&
 420                     new_blob->length % expected_elem_size != 0) {
 421                         drm_property_blob_put(new_blob);
 422                         return -EINVAL;
 423                 }
 424         }
 425
 426         *replaced |= drm_property_replace_blob(blob, new_blob);
 427         drm_property_blob_put(new_blob);
 428
 429         return 0;
 430 }
 431
 432 static int drm_atomic_crtc_set_property(struct drm_crtc *crtc,
 433                 struct drm_crtc_state *state, struct drm_property *property,
 434                 uint64_t val)
 435 {
 436         struct drm_device *dev = crtc->dev;
 437         struct drm_mode_config *config = &dev->mode_config;
 438         bool replaced = false;
 439         int ret;
 440
 441         if (property == config->prop_active)
 442                 state->active = val;
 443         else if (property == config->prop_mode_id) {
 444                 struct drm_property_blob *mode =
 445                         drm_property_lookup_blob(dev, val);
 446                 ret = drm_atomic_set_mode_prop_for_crtc(state, mode);
 447                 drm_property_blob_put(mode);
 448                 return ret;
 449         } else if (property == config->prop_vrr_enabled) {
 450                 state->vrr_enabled = val;
 451         } else if (property == config->degamma_lut_property) {
 452                 ret = drm_atomic_replace_property_blob_from_id(dev,
 453                                         &state->degamma_lut,
 454                                         val,
 455                                         -1, sizeof(struct drm_color_lut),
 456                                         &replaced);
 457                 state->color_mgmt_changed |= replaced;
 458                 return ret;
 459         } else if (property == config->ctm_property) {
 460                 ret = drm_atomic_replace_property_blob_from_id(dev,
 461                                         &state->ctm,
 462                                         val,
 463                                         sizeof(struct drm_color_ctm), -1,
 464                                         &replaced);
 465                 state->color_mgmt_changed |= replaced;
 466                 return ret;
 467         } else if (property == config->gamma_lut_property) {
 468                 ret = drm_atomic_replace_property_blob_from_id(dev,
 469                                         &state->gamma_lut,
 470                                         val,
 471                                         -1, sizeof(struct drm_color_lut),
 472                                         &replaced);
 473                 state->color_mgmt_changed |= replaced;
 474                 return ret;
 475         } else if (property == config->prop_out_fence_ptr) {
 476                 s32 __user *fence_ptr = u64_to_user_ptr(val);
 477
 478                 if (!fence_ptr)
 479                         return 0;
 480
 481                 if (put_user(-1, fence_ptr))
 482                         return -EFAULT;
 483
 484                 set_out_fence_for_crtc(state->state, crtc, fence_ptr);
 485         } else if (property == crtc->scaling_filter_property) {
 486                 state->scaling_filter = val;
 487         } else if (crtc->funcs->atomic_set_property) {
 488                 return crtc->funcs->atomic_set_property(crtc, state, property, val);
 489         } else {
 490                 drm_dbg_atomic(crtc->dev,
 491                                "[CRTC:%d:%s] unknown property [PROP:%d:%s]]\n",
 492                                crtc->base.id, crtc->name,
 493                                property->base.id, property->name);
 494                 return -EINVAL;
 495         }
 496
 497         return 0;
 498 }
 499
 500 static int
 501 drm_atomic_crtc_get_property(struct drm_crtc *crtc,
 502                 const struct drm_crtc_state *state,
 503                 struct drm_property *property, uint64_t *val)
 504 {
 505         struct drm_device *dev = crtc->dev;
 506         struct drm_mode_config *config = &dev->mode_config;
 507
 508         if (property == config->prop_active)
 509                 *val = drm_atomic_crtc_effectively_active(state);
 510         else if (property == config->prop_mode_id)
 511                 *val = (state->mode_blob) ? state->mode_blob->base.id : 0;
 512         else if (property == config->prop_vrr_enabled)
 513                 *val = state->vrr_enabled;
 514         else if (property == config->degamma_lut_property)
 515                 *val = (state->degamma_lut) ? state->degamma_lut->base.id : 0;
 516         else if (property == config->ctm_property)
 517                 *val = (state->ctm) ? state->ctm->base.id : 0;
 518         else if (property == config->gamma_lut_property)
 519                 *val = (state->gamma_lut) ? state->gamma_lut->base.id : 0;
 520         else if (property == config->prop_out_fence_ptr)
 521                 *val = 0;
 522         else if (property == crtc->scaling_filter_property)
 523                 *val = state->scaling_filter;
 524         else if (crtc->funcs->atomic_get_property)
 525                 return crtc->funcs->atomic_get_property(crtc, state, property, val);
 526         else
 527                 return -EINVAL;
 528
 529         return 0;
 530 }
 531
 532 static int drm_atomic_plane_set_property(struct drm_plane *plane,
 533                 struct drm_plane_state *state, struct drm_file *file_priv,
 534                 struct drm_property *property, uint64_t val)
 535 {
 536         struct drm_device *dev = plane->dev;
 537         struct drm_mode_config *config = &dev->mode_config;
 538         bool replaced = false;
 539         int ret;
 540
 541         if (property == config->prop_fb_id) {
 542                 struct drm_framebuffer *fb;
 543
 544                 fb = drm_framebuffer_lookup(dev, file_priv, val);
 545                 drm_atomic_set_fb_for_plane(state, fb);
 546                 if (fb)
 547                         drm_framebuffer_put(fb);
 548         } else if (property == config->prop_in_fence_fd) {
 549                 if (state->fence)
 550                         return -EINVAL;
 551
 552                 if (U642I64(val) == -1)
 553                         return 0;
 554
 555                 state->fence = sync_file_get_fence(val);
 556                 if (!state->fence)
 557                         return -EINVAL;
 558
 559         } else if (property == config->prop_crtc_id) {
 560                 struct drm_crtc *crtc = drm_crtc_find(dev, file_priv, val);
 561
 562                 if (val && !crtc)
 563                         return -EACCES;
 564                 return drm_atomic_set_crtc_for_plane(state, crtc);
 565         } else if (property == config->prop_crtc_x) {
 566                 state->crtc_x = U642I64(val);
 567         } else if (property == config->prop_crtc_y) {
 568                 state->crtc_y = U642I64(val);
 569         } else if (property == config->prop_crtc_w) {
 570                 state->crtc_w = val;
 571         } else if (property == config->prop_crtc_h) {
 572                 state->crtc_h = val;
 573         } else if (property == config->prop_src_x) {
 574                 state->src_x = val;
 575         } else if (property == config->prop_src_y) {
 576                 state->src_y = val;
 577         } else if (property == config->prop_src_w) {
 578                 state->src_w = val;
 579         } else if (property == config->prop_src_h) {
 580                 state->src_h = val;
 581         } else if (property == plane->alpha_property) {
 582                 state->alpha = val;
 583         } else if (property == plane->blend_mode_property) {
 584                 state->pixel_blend_mode = val;
 585         } else if (property == plane->rotation_property) {
 586                 if (!is_power_of_2(val & DRM_MODE_ROTATE_MASK)) {
 587                         drm_dbg_atomic(plane->dev,
 588                                        "[PLANE:%d:%s] bad rotation bitmask: 0x%llx\n",
 589                                        plane->base.id, plane->name, val);
 590                         return -EINVAL;
 591                 }
 592                 state->rotation = val;
 593         } else if (property == plane->zpos_property) {
 594                 state->zpos = val;
 595         } else if (property == plane->color_encoding_property) {
 596                 state->color_encoding = val;
 597         } else if (property == plane->color_range_property) {
 598                 state->color_range = val;
 599         } else if (property == config->prop_fb_damage_clips) {
 600                 ret = drm_atomic_replace_property_blob_from_id(dev,
 601                                         &state->fb_damage_clips,
 602                                         val,
 603                                         -1,
 604                                         sizeof(struct drm_rect),
 605                                         &replaced);
 606                 return ret;
 607         } else if (property == plane->scaling_filter_property) {
 608                 state->scaling_filter = val;
 609         } else if (plane->funcs->atomic_set_property) {
 610                 return plane->funcs->atomic_set_property(plane, state,
 611                                 property, val);
 612         } else {
 613                 drm_dbg_atomic(plane->dev,
 614                                "[PLANE:%d:%s] unknown property [PROP:%d:%s]]\n",
 615                                plane->base.id, plane->name,
 616                                property->base.id, property->name);
 617                 return -EINVAL;
 618         }
 619
 620         return 0;
 621 }
 622
 623 static int
 624 drm_atomic_plane_get_property(struct drm_plane *plane,
 625                 const struct drm_plane_state *state,
 626                 struct drm_property *property, uint64_t *val)
 627 {
 628         struct drm_device *dev = plane->dev;
 629         struct drm_mode_config *config = &dev->mode_config;
 630
 631         if (property == config->prop_fb_id) {
 632                 *val = (state->fb) ? state->fb->base.id : 0;
 633         } else if (property == config->prop_in_fence_fd) {
 634                 *val = -1;
 635         } else if (property == config->prop_crtc_id) {
 636                 *val = (state->crtc) ? state->crtc->base.id : 0;
 637         } else if (property == config->prop_crtc_x) {
 638                 *val = I642U64(state->crtc_x);
 639         } else if (property == config->prop_crtc_y) {
 640                 *val = I642U64(state->crtc_y);
 641         } else if (property == config->prop_crtc_w) {
 642                 *val = state->crtc_w;
 643         } else if (property == config->prop_crtc_h) {
 644                 *val = state->crtc_h;
 645         } else if (property == config->prop_src_x) {
 646                 *val = state->src_x;
 647         } else if (property == config->prop_src_y) {
 648                 *val = state->src_y;
 649         } else if (property == config->prop_src_w) {
 650                 *val = state->src_w;
 651         } else if (property == config->prop_src_h) {
 652                 *val = state->src_h;
 653         } else if (property == plane->alpha_property) {
 654                 *val = state->alpha;
 655         } else if (property == plane->blend_mode_property) {
 656                 *val = state->pixel_blend_mode;
 657         } else if (property == plane->rotation_property) {
 658                 *val = state->rotation;
 659         } else if (property == plane->zpos_property) {
 660                 *val = state->zpos;
 661         } else if (property == plane->color_encoding_property) {
 662                 *val = state->color_encoding;
 663         } else if (property == plane->color_range_property) {
 664                 *val = state->color_range;
 665         } else if (property == config->prop_fb_damage_clips) {
 666                 *val = (state->fb_damage_clips) ?
 667                         state->fb_damage_clips->base.id : 0;
 668         } else if (property == plane->scaling_filter_property) {
 669                 *val = state->scaling_filter;
 670         } else if (plane->funcs->atomic_get_property) {
 671                 return plane->funcs->atomic_get_property(plane, state, property, val);
 672         } else {
 673                 return -EINVAL;
 674         }
 675
 676         return 0;
 677 }
 678
 679 static int drm_atomic_set_writeback_fb_for_connector(
 680                 struct drm_connector_state *conn_state,
 681                 struct drm_framebuffer *fb)
 682 {
 683         int ret;
 684         struct drm_connector *conn = conn_state->connector;
 685
 686         ret = drm_writeback_set_fb(conn_state, fb);
 687         if (ret < 0)
 688                 return ret;
 689
 690         if (fb)
 691                 drm_dbg_atomic(conn->dev,
 692                                "Set [FB:%d] for connector state %p\n",
 693                                fb->base.id, conn_state);
 694         else
 695                 drm_dbg_atomic(conn->dev,
 696                                "Set [NOFB] for connector state %p\n",
 697                                conn_state);
 698
 699         return 0;
 700 }
 701
 702 static int drm_atomic_connector_set_property(struct drm_connector *connector,
 703                 struct drm_connector_state *state, struct drm_file *file_priv,
 704                 struct drm_property *property, uint64_t val)
 705 {
 706         struct drm_device *dev = connector->dev;
 707         struct drm_mode_config *config = &dev->mode_config;
 708         bool replaced = false;
 709         int ret;
 710
 711         if (property == config->prop_crtc_id) {
 712                 struct drm_crtc *crtc = drm_crtc_find(dev, file_priv, val);
 713
 714                 if (val && !crtc)
 715                         return -EACCES;
 716                 return drm_atomic_set_crtc_for_connector(state, crtc);
 717         } else if (property == config->dpms_property) {
 718                 /* setting DPMS property requires special handling, which
 719                  * is done in legacy setprop path for us.  Disallow (for
 720                  * now?) atomic writes to DPMS property:
 721                  */
 722                 return -EINVAL;
 723         } else if (property == config->tv_select_subconnector_property) {
 724                 state->tv.subconnector = val;
 725         } else if (property == config->tv_left_margin_property) {
 726                 state->tv.margins.left = val;
 727         } else if (property == config->tv_right_margin_property) {
 728                 state->tv.margins.right = val;
 729         } else if (property == config->tv_top_margin_property) {
 730                 state->tv.margins.top = val;
 731         } else if (property == config->tv_bottom_margin_property) {
 732                 state->tv.margins.bottom = val;
 733         } else if (property == config->tv_mode_property) {
 734                 state->tv.mode = val;
 735         } else if (property == config->tv_brightness_property) {
 736                 state->tv.brightness = val;
 737         } else if (property == config->tv_contrast_property) {
 738                 state->tv.contrast = val;
 739         } else if (property == config->tv_flicker_reduction_property) {
 740                 state->tv.flicker_reduction = val;
 741         } else if (property == config->tv_overscan_property) {
 742                 state->tv.overscan = val;
 743         } else if (property == config->tv_saturation_property) {
 744                 state->tv.saturation = val;
 745         } else if (property == config->tv_hue_property) {
 746                 state->tv.hue = val;
 747         } else if (property == config->link_status_property) {
 748                 /* Never downgrade from GOOD to BAD on userspace's request here,
 749                  * only hw issues can do that.
 750                  *
 751                  * For an atomic property the userspace doesn't need to be able
 752                  * to understand all the properties, but needs to be able to
 753                  * restore the state it wants on VT switch. So if the userspace
 754                  * tries to change the link_status from GOOD to BAD, driver
 755                  * silently rejects it and returns a 0. This prevents userspace
 756                  * from accidentally breaking  the display when it restores the
 757                  * state.
 758                  */
 759                 if (state->link_status != DRM_LINK_STATUS_GOOD)
 760                         state->link_status = val;
 761         } else if (property == config->hdr_output_metadata_property) {
 762                 ret = drm_atomic_replace_property_blob_from_id(dev,
 763                                 &state->hdr_output_metadata,
 764                                 val,
 765                                 sizeof(struct hdr_output_metadata), -1,
 766                                 &replaced);
 767                 return ret;
 768         } else if (property == config->aspect_ratio_property) {
 769                 state->picture_aspect_ratio = val;
 770         } else if (property == config->content_type_property) {
 771                 state->content_type = val;
 772         } else if (property == connector->scaling_mode_property) {
 773                 state->scaling_mode = val;
 774         } else if (property == config->content_protection_property) {
 775                 if (val == DRM_MODE_CONTENT_PROTECTION_ENABLED) {
 776                         DRM_DEBUG_KMS("only drivers can set CP Enabled\n");
 777                         return -EINVAL;
 778                 }
 779                 state->content_protection = val;
 780         } else if (property == config->hdcp_content_type_property) {
 781                 state->hdcp_content_type = val;
 782         } else if (property == connector->colorspace_property) {
 783                 state->colorspace = val;
 784         } else if (property == config->writeback_fb_id_property) {
 785                 struct drm_framebuffer *fb;
 786                 int ret;
 787
 788                 fb = drm_framebuffer_lookup(dev, file_priv, val);
 789                 ret = drm_atomic_set_writeback_fb_for_connector(state, fb);
 790                 if (fb)
 791                         drm_framebuffer_put(fb);
 792                 return ret;
 793         } else if (property == config->writeback_out_fence_ptr_property) {
 794                 s32 __user *fence_ptr = u64_to_user_ptr(val);
 795
 796                 return set_out_fence_for_connector(state->state, connector,
 797                                                    fence_ptr);
 798         } else if (property == connector->max_bpc_property) {
 799                 state->max_requested_bpc = val;
 800         } else if (connector->funcs->atomic_set_property) {
 801                 return connector->funcs->atomic_set_property(connector,
 802                                 state, property, val);
 803         } else {
 804                 drm_dbg_atomic(connector->dev,
 805                                "[CONNECTOR:%d:%s] unknown property [PROP:%d:%s]]\n",
 806                                connector->base.id, connector->name,
 807                                property->base.id, property->name);
 808                 return -EINVAL;
 809         }
 810
 811         return 0;
 812 }
 813
 814 static int
 815 drm_atomic_connector_get_property(struct drm_connector *connector,
 816                 const struct drm_connector_state *state,
 817                 struct drm_property *property, uint64_t *val)
 818 {
 819         struct drm_device *dev = connector->dev;
 820         struct drm_mode_config *config = &dev->mode_config;
 821
 822         if (property == config->prop_crtc_id) {
 823                 *val = (state->crtc) ? state->crtc->base.id : 0;
 824         } else if (property == config->dpms_property) {
 825                 if (state->crtc && state->crtc->state->self_refresh_active)
 826                         *val = DRM_MODE_DPMS_ON;
 827                 else
 828                         *val = connector->dpms;
 829         } else if (property == config->tv_select_subconnector_property) {
 830                 *val = state->tv.subconnector;
 831         } else if (property == config->tv_left_margin_property) {
 832                 *val = state->tv.margins.left;
 833         } else if (property == config->tv_right_margin_property) {
 834                 *val = state->tv.margins.right;
 835         } else if (property == config->tv_top_margin_property) {
 836                 *val = state->tv.margins.top;
 837         } else if (property == config->tv_bottom_margin_property) {
 838                 *val = state->tv.margins.bottom;
 839         } else if (property == config->tv_mode_property) {
 840                 *val = state->tv.mode;
 841         } else if (property == config->tv_brightness_property) {
 842                 *val = state->tv.brightness;
 843         } else if (property == config->tv_contrast_property) {
 844                 *val = state->tv.contrast;
 845         } else if (property == config->tv_flicker_reduction_property) {
 846                 *val = state->tv.flicker_reduction;
 847         } else if (property == config->tv_overscan_property) {
 848                 *val = state->tv.overscan;
 849         } else if (property == config->tv_saturation_property) {
 850                 *val = state->tv.saturation;
 851         } else if (property == config->tv_hue_property) {
 852                 *val = state->tv.hue;
 853         } else if (property == config->link_status_property) {
 854                 *val = state->link_status;
 855         } else if (property == config->aspect_ratio_property) {
 856                 *val = state->picture_aspect_ratio;
 857         } else if (property == config->content_type_property) {
 858                 *val = state->content_type;
 859         } else if (property == connector->colorspace_property) {
 860                 *val = state->colorspace;
 861         } else if (property == connector->scaling_mode_property) {
 862                 *val = state->scaling_mode;
 863         } else if (property == config->hdr_output_metadata_property) {
 864                 *val = state->hdr_output_metadata ?
 865                         state->hdr_output_metadata->base.id : 0;
 866         } else if (property == config->content_protection_property) {
 867                 *val = state->content_protection;
 868         } else if (property == config->hdcp_content_type_property) {
 869                 *val = state->hdcp_content_type;
 870         } else if (property == config->writeback_fb_id_property) {
 871                 /* Writeback framebuffer is one-shot, write and forget */
 872                 *val = 0;
 873         } else if (property == config->writeback_out_fence_ptr_property) {
 874                 *val = 0;
 875         } else if (property == connector->max_bpc_property) {
 876                 *val = state->max_requested_bpc;
 877         } else if (connector->funcs->atomic_get_property) {
 878                 return connector->funcs->atomic_get_property(connector,
 879                                 state, property, val);
 880         } else {
 881                 return -EINVAL;
 882         }
 883
 884         return 0;
 885 }
 886
 887 int drm_atomic_get_property(struct drm_mode_object *obj,
 888                 struct drm_property *property, uint64_t *val)
 889 {
 890         struct drm_device *dev = property->dev;
 891         int ret;
 892
 893         switch (obj->type) {
 894         case DRM_MODE_OBJECT_CONNECTOR: {
 895                 struct drm_connector *connector = obj_to_connector(obj);
 896
 897                 WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
 898                 ret = drm_atomic_connector_get_property(connector,
 899                                 connector->state, property, val);
 900                 break;
 901         }
 902         case DRM_MODE_OBJECT_CRTC: {
 903                 struct drm_crtc *crtc = obj_to_crtc(obj);
 904
 905                 WARN_ON(!drm_modeset_is_locked(&crtc->mutex));
 906                 ret = drm_atomic_crtc_get_property(crtc,
 907                                 crtc->state, property, val);
 908                 break;
 909         }
 910         case DRM_MODE_OBJECT_PLANE: {
 911                 struct drm_plane *plane = obj_to_plane(obj);
 912
 913                 WARN_ON(!drm_modeset_is_locked(&plane->mutex));
 914                 ret = drm_atomic_plane_get_property(plane,
 915                                 plane->state, property, val);
 916                 break;
 917         }
 918         default:
 919                 ret = -EINVAL;
 920                 break;
 921         }
 922
 923         return ret;
 924 }
 925
 926 /*
 927  * The big monster ioctl
 928  */
 929
 930 static struct drm_pending_vblank_event *create_vblank_event(
 931                 struct drm_crtc *crtc, uint64_t user_data)
 932 {
 933         struct drm_pending_vblank_event *e = NULL;
 934
 935         e = kzalloc(sizeof *e, GFP_KERNEL);
 936         if (!e)
 937                 return NULL;
 938
 939         e->event.base.type = DRM_EVENT_FLIP_COMPLETE;
 940         e->event.base.length = sizeof(e->event);
 941         e->event.vbl.crtc_id = crtc->base.id;
 942         e->event.vbl.user_data = user_data;
 943
 944         return e;
 945 }
 946
 947 int drm_atomic_connector_commit_dpms(struct drm_atomic_state *state,
 948                                      struct drm_connector *connector,
 949                                      int mode)
 950 {
 951         struct drm_connector *tmp_connector;
 952         struct drm_connector_state *new_conn_state;
 953         struct drm_crtc *crtc;
 954         struct drm_crtc_state *crtc_state;
 955         int i, ret, old_mode = connector->dpms;
 956         bool active = false;
 957
 958         ret = drm_modeset_lock(&state->dev->mode_config.connection_mutex,
 959                                state->acquire_ctx);
 960         if (ret)
 961                 return ret;
 962
 963         if (mode != DRM_MODE_DPMS_ON)
 964                 mode = DRM_MODE_DPMS_OFF;
 965         connector->dpms = mode;
 966
 967         crtc = connector->state->crtc;
 968         if (!crtc)
 969                 goto out;
 970         ret = drm_atomic_add_affected_connectors(state, crtc);
 971         if (ret)
 972                 goto out;
 973
 974         crtc_state = drm_atomic_get_crtc_state(state, crtc);
 975         if (IS_ERR(crtc_state)) {
 976                 ret = PTR_ERR(crtc_state);
 977                 goto out;
 978         }
 979
 980         for_each_new_connector_in_state(state, tmp_connector, new_conn_state, i) {
 981                 if (new_conn_state->crtc != crtc)
 982                         continue;
 983                 if (tmp_connector->dpms == DRM_MODE_DPMS_ON) {
 984                         active = true;
 985                         break;
 986                 }
 987         }
 988
 989         crtc_state->active = active;
 990         ret = drm_atomic_commit(state);
 991 out:
 992         if (ret != 0)
 993                 connector->dpms = old_mode;
 994         return ret;
 995 }
 996
 997 int drm_atomic_set_property(struct drm_atomic_state *state,
 998                             struct drm_file *file_priv,
 999                             struct drm_mode_object *obj,
1000                             struct drm_property *prop,
1001                             uint64_t prop_value)
1002 {
1003         struct drm_mode_object *ref;
1004         int ret;
1005
1006         if (!drm_property_change_valid_get(prop, prop_value, &ref))
1007                 return -EINVAL;
1008
1009         switch (obj->type) {
1010         case DRM_MODE_OBJECT_CONNECTOR: {
1011                 struct drm_connector *connector = obj_to_connector(obj);
1012                 struct drm_connector_state *connector_state;
1013
1014                 connector_state = drm_atomic_get_connector_state(state, connector);
1015                 if (IS_ERR(connector_state)) {
1016                         ret = PTR_ERR(connector_state);
1017                         break;
1018                 }
1019
1020                 ret = drm_atomic_connector_set_property(connector,
1021                                 connector_state, file_priv,
1022                                 prop, prop_value);
1023                 break;
1024         }
1025         case DRM_MODE_OBJECT_CRTC: {
1026                 struct drm_crtc *crtc = obj_to_crtc(obj);
1027                 struct drm_crtc_state *crtc_state;
1028
1029                 crtc_state = drm_atomic_get_crtc_state(state, crtc);
1030                 if (IS_ERR(crtc_state)) {
1031                         ret = PTR_ERR(crtc_state);
1032                         break;
1033                 }
1034
1035                 ret = drm_atomic_crtc_set_property(crtc,
1036                                 crtc_state, prop, prop_value);
1037                 break;
1038         }
1039         case DRM_MODE_OBJECT_PLANE: {
1040                 struct drm_plane *plane = obj_to_plane(obj);
1041                 struct drm_plane_state *plane_state;
1042
1043                 plane_state = drm_atomic_get_plane_state(state, plane);
1044                 if (IS_ERR(plane_state)) {
1045                         ret = PTR_ERR(plane_state);
1046                         break;
1047                 }
1048
1049                 ret = drm_atomic_plane_set_property(plane,
1050                                 plane_state, file_priv,
1051                                 prop, prop_value);
1052                 break;
1053         }
1054         default:
1055                 ret = -EINVAL;
1056                 break;
1057         }
1058
1059         drm_property_change_valid_put(prop, ref);
1060         return ret;
1061 }
1062
1063 /**
1064  * DOC: explicit fencing properties
1065  *
1066  * Explicit fencing allows userspace to control the buffer synchronization
1067  * between devices. A Fence or a group of fences are transferred to/from
1068  * userspace using Sync File fds and there are two DRM properties for that.
1069  * IN_FENCE_FD on each DRM Plane to send fences to the kernel and
1070  * OUT_FENCE_PTR on each DRM CRTC to receive fences from the kernel.
1071  *
1072  * As a contrast, with implicit fencing the kernel keeps track of any
1073  * ongoing rendering, and automatically ensures that the atomic update waits
1074  * for any pending rendering to complete. For shared buffers represented with
1075  * a &struct dma_buf this is tracked in &struct dma_resv.
1076  * Implicit syncing is how Linux traditionally worked (e.g. DRI2/3 on X.org),
1077  * whereas explicit fencing is what Android wants.
1078  *
1079  * "IN_FENCE_FD”:
1080  *      Use this property to pass a fence that DRM should wait on before
1081  *      proceeding with the Atomic Commit request and show the framebuffer for
1082  *      the plane on the screen. The fence can be either a normal fence or a
1083  *      merged one, the sync_file framework will handle both cases and use a
1084  *      fence_array if a merged fence is received. Passing -1 here means no
1085  *      fences to wait on.
1086  *
1087  *      If the Atomic Commit request has the DRM_MODE_ATOMIC_TEST_ONLY flag
1088  *      it will only check if the Sync File is a valid one.
1089  *
1090  *      On the driver side the fence is stored on the @fence parameter of
1091  *      &struct drm_plane_state. Drivers which also support implicit fencing
1092  *      should set the implicit fence using drm_atomic_set_fence_for_plane(),
1093  *      to make sure there's consistent behaviour between drivers in precedence
1094  *      of implicit vs. explicit fencing.
1095  *
1096  * "OUT_FENCE_PTR”:
1097  *      Use this property to pass a file descriptor pointer to DRM. Once the
1098  *      Atomic Commit request call returns OUT_FENCE_PTR will be filled with
1099  *      the file descriptor number of a Sync File. This Sync File contains the
1100  *      CRTC fence that will be signaled when all framebuffers present on the
1101  *      Atomic Commit * request for that given CRTC are scanned out on the
1102  *      screen.
1103  *
1104  *      The Atomic Commit request fails if a invalid pointer is passed. If the
1105  *      Atomic Commit request fails for any other reason the out fence fd
1106  *      returned will be -1. On a Atomic Commit with the
1107  *      DRM_MODE_ATOMIC_TEST_ONLY flag the out fence will also be set to -1.
1108  *
1109  *      Note that out-fences don't have a special interface to drivers and are
1110  *      internally represented by a &struct drm_pending_vblank_event in struct
1111  *      &drm_crtc_state, which is also used by the nonblocking atomic commit
1112  *      helpers and for the DRM event handling for existing userspace.
1113  */
1114
1115 struct drm_out_fence_state {
1116         s32 __user *out_fence_ptr;
1117         struct sync_file *sync_file;
1118         int fd;
1119 };
1120
1121 static int setup_out_fence(struct drm_out_fence_state *fence_state,
1122                            struct dma_fence *fence)
1123 {
1124         fence_state->fd = get_unused_fd_flags(O_CLOEXEC);
1125         if (fence_state->fd < 0)
1126                 return fence_state->fd;
1127
1128         if (put_user(fence_state->fd, fence_state->out_fence_ptr))
1129                 return -EFAULT;
1130
1131         fence_state->sync_file = sync_file_create(fence);
1132         if (!fence_state->sync_file)
1133                 return -ENOMEM;
1134
1135         return 0;
1136 }
1137
1138 static int prepare_signaling(struct drm_device *dev,
1139                                   struct drm_atomic_state *state,
1140                                   struct drm_mode_atomic *arg,
1141                                   struct drm_file *file_priv,
1142                                   struct drm_out_fence_state **fence_state,
1143                                   unsigned int *num_fences)
1144 {
1145         struct drm_crtc *crtc;
1146         struct drm_crtc_state *crtc_state;
1147         struct drm_connector *conn;
1148         struct drm_connector_state *conn_state;
1149         int i, c = 0, ret;
1150
1151         if (arg->flags & DRM_MODE_ATOMIC_TEST_ONLY)
1152                 return 0;
1153
1154         for_each_new_crtc_in_state(state, crtc, crtc_state, i) {
1155                 s32 __user *fence_ptr;
1156
1157                 fence_ptr = get_out_fence_for_crtc(crtc_state->state, crtc);
1158
1159                 if (arg->flags & DRM_MODE_PAGE_FLIP_EVENT || fence_ptr) {
1160                         struct drm_pending_vblank_event *e;
1161
1162                         e = create_vblank_event(crtc, arg->user_data);
1163                         if (!e)
1164                                 return -ENOMEM;
1165
1166                         crtc_state->event = e;
1167                 }
1168
1169                 if (arg->flags & DRM_MODE_PAGE_FLIP_EVENT) {
1170                         struct drm_pending_vblank_event *e = crtc_state->event;
1171
1172                         if (!file_priv)
1173                                 continue;
1174
1175                         ret = drm_event_reserve_init(dev, file_priv, &e->base,
1176                                                      &e->event.base);
1177                         if (ret) {
1178                                 kfree(e);
1179                                 crtc_state->event = NULL;
1180                                 return ret;
1181                         }
1182                 }
1183
1184                 if (fence_ptr) {
1185                         struct dma_fence *fence;
1186                         struct drm_out_fence_state *f;
1187
1188                         f = krealloc(*fence_state, sizeof(**fence_state) *
1189                                      (*num_fences + 1), GFP_KERNEL);
1190                         if (!f)
1191                                 return -ENOMEM;
1192
1193                         memset(&f[*num_fences], 0, sizeof(*f));
1194
1195                         f[*num_fences].out_fence_ptr = fence_ptr;
1196                         *fence_state = f;
1197
1198                         fence = drm_crtc_create_fence(crtc);
1199                         if (!fence)
1200                                 return -ENOMEM;
1201
1202                         ret = setup_out_fence(&f[(*num_fences)++], fence);
1203                         if (ret) {
1204                                 dma_fence_put(fence);
1205                                 return ret;
1206                         }
1207
1208                         crtc_state->event->base.fence = fence;
1209                 }
1210
1211                 c++;
1212         }
1213
1214         for_each_new_connector_in_state(state, conn, conn_state, i) {
1215                 struct drm_writeback_connector *wb_conn;
1216                 struct drm_out_fence_state *f;
1217                 struct dma_fence *fence;
1218                 s32 __user *fence_ptr;
1219
1220                 if (!conn_state->writeback_job)
1221                         continue;
1222
1223                 fence_ptr = get_out_fence_for_connector(state, conn);
1224                 if (!fence_ptr)
1225                         continue;
1226
1227                 f = krealloc(*fence_state, sizeof(**fence_state) *
1228                              (*num_fences + 1), GFP_KERNEL);
1229                 if (!f)
1230                         return -ENOMEM;
1231
1232                 memset(&f[*num_fences], 0, sizeof(*f));
1233
1234                 f[*num_fences].out_fence_ptr = fence_ptr;
1235                 *fence_state = f;
1236
1237                 wb_conn = drm_connector_to_writeback(conn);
1238                 fence = drm_writeback_get_out_fence(wb_conn);
1239                 if (!fence)
1240                         return -ENOMEM;
1241
1242                 ret = setup_out_fence(&f[(*num_fences)++], fence);
1243                 if (ret) {
1244                         dma_fence_put(fence);
1245                         return ret;
1246                 }
1247
1248                 conn_state->writeback_job->out_fence = fence;
1249         }
1250
1251         /*
1252          * Having this flag means user mode pends on event which will never
1253          * reach due to lack of at least one CRTC for signaling
1254          */
1255         if (c == 0 && (arg->flags & DRM_MODE_PAGE_FLIP_EVENT))
1256                 return -EINVAL;
1257
1258         return 0;
1259 }
1260
1261 static void complete_signaling(struct drm_device *dev,
1262                                struct drm_atomic_state *state,
1263                                struct drm_out_fence_state *fence_state,
1264                                unsigned int num_fences,
1265                                bool install_fds)
1266 {
1267         struct drm_crtc *crtc;
1268         struct drm_crtc_state *crtc_state;
1269         int i;
1270
1271         if (install_fds) {
1272                 for (i = 0; i < num_fences; i++)
1273                         fd_install(fence_state[i].fd,
1274                                    fence_state[i].sync_file->file);
1275
1276                 kfree(fence_state);
1277                 return;
1278         }
1279
1280         for_each_new_crtc_in_state(state, crtc, crtc_state, i) {
1281                 struct drm_pending_vblank_event *event = crtc_state->event;
1282                 /*
1283                  * Free the allocated event. drm_atomic_helper_setup_commit
1284                  * can allocate an event too, so only free it if it's ours
1285                  * to prevent a double free in drm_atomic_state_clear.
1286                  */
1287                 if (event && (event->base.fence || event->base.file_priv)) {
1288                         drm_event_cancel_free(dev, &event->base);
1289                         crtc_state->event = NULL;
1290                 }
1291         }
1292
1293         if (!fence_state)
1294                 return;
1295
1296         for (i = 0; i < num_fences; i++) {
1297                 if (fence_state[i].sync_file)
1298                         fput(fence_state[i].sync_file->file);
1299                 if (fence_state[i].fd >= 0)
1300                         put_unused_fd(fence_state[i].fd);
1301
1302                 /* If this fails log error to the user */
1303                 if (fence_state[i].out_fence_ptr &&
1304                     put_user(-1, fence_state[i].out_fence_ptr))
1305                         drm_dbg_atomic(dev, "Couldn't clear out_fence_ptr\n");
1306         }
1307
1308         kfree(fence_state);
1309 }
1310
1311 int drm_mode_atomic_ioctl(struct drm_device *dev,
1312                           void *data, struct drm_file *file_priv)
1313 {
1314         struct drm_mode_atomic *arg = data;
1315         uint32_t __user *objs_ptr = (uint32_t __user *)(unsigned long)(arg->objs_ptr);
1316         uint32_t __user *count_props_ptr = (uint32_t __user *)(unsigned long)(arg->count_props_ptr);
1317         uint32_t __user *props_ptr = (uint32_t __user *)(unsigned long)(arg->props_ptr);
1318         uint64_t __user *prop_values_ptr = (uint64_t __user *)(unsigned long)(arg->prop_values_ptr);
1319         unsigned int copied_objs, copied_props;
1320         struct drm_atomic_state *state;
1321         struct drm_modeset_acquire_ctx ctx;
1322         struct drm_out_fence_state *fence_state;
1323         int ret = 0;
1324         unsigned int i, j, num_fences;
1325         struct drm_printer p = drm_info_printer(dev->dev);
1326
1327         /* disallow for drivers not supporting atomic: */
1328         if (!drm_core_check_feature(dev, DRIVER_ATOMIC))
1329                 return -EOPNOTSUPP;
1330
1331         /* disallow for userspace that has not enabled atomic cap (even
1332          * though this may be a bit overkill, since legacy userspace
1333          * wouldn't know how to call this ioctl)
1334          */
1335         if (!file_priv->atomic) {
1336                 drm_dbg_atomic(dev,
1337                                "commit failed: atomic cap not enabled\n");
1338                 return -EINVAL;
1339         }
1340
1341         if (arg->flags & ~DRM_MODE_ATOMIC_FLAGS) {
1342                 drm_dbg_atomic(dev, "commit failed: invalid flag\n");
1343                 return -EINVAL;
1344         }
1345
1346         if (arg->reserved) {
1347                 drm_dbg_atomic(dev, "commit failed: reserved field set\n");
1348                 return -EINVAL;
1349         }
1350
1351         if (arg->flags & DRM_MODE_PAGE_FLIP_ASYNC) {
1352                 drm_dbg_atomic(dev,
1353                                "commit failed: invalid flag DRM_MODE_PAGE_FLIP_ASYNC\n");
1354                 return -EINVAL;
1355         }
1356
1357         /* can't test and expect an event at the same time. */
1358         if ((arg->flags & DRM_MODE_ATOMIC_TEST_ONLY) &&
1359                         (arg->flags & DRM_MODE_PAGE_FLIP_EVENT)) {
1360                 drm_dbg_atomic(dev,
1361                                "commit failed: page-flip event requested with test-only commit\n");
1362                 return -EINVAL;
1363         }
1364
1365         state = drm_atomic_state_alloc(dev);
1366         if (!state)
1367                 return -ENOMEM;
1368
1369         drm_modeset_acquire_init(&ctx, DRM_MODESET_ACQUIRE_INTERRUPTIBLE);
1370         state->acquire_ctx = &ctx;
1371         state->allow_modeset = !!(arg->flags & DRM_MODE_ATOMIC_ALLOW_MODESET);
1372
1373 retry:
1374         copied_objs = 0;
1375         copied_props = 0;
1376         fence_state = NULL;
1377         num_fences = 0;
1378
1379         for (i = 0; i < arg->count_objs; i++) {
1380                 uint32_t obj_id, count_props;
1381                 struct drm_mode_object *obj;
1382
1383                 if (get_user(obj_id, objs_ptr + copied_objs)) {
1384                         ret = -EFAULT;
1385                         goto out;
1386                 }
1387
1388                 obj = drm_mode_object_find(dev, file_priv, obj_id, DRM_MODE_OBJECT_ANY);
1389                 if (!obj) {
1390                         ret = -ENOENT;
1391                         goto out;
1392                 }
1393
1394                 if (!obj->properties) {
1395                         drm_mode_object_put(obj);
1396                         ret = -ENOENT;
1397                         goto out;
1398                 }
1399
1400                 if (get_user(count_props, count_props_ptr + copied_objs)) {
1401                         drm_mode_object_put(obj);
1402                         ret = -EFAULT;
1403                         goto out;
1404                 }
1405
1406                 copied_objs++;
1407
1408                 for (j = 0; j < count_props; j++) {
1409                         uint32_t prop_id;
1410                         uint64_t prop_value;
1411                         struct drm_property *prop;
1412
1413                         if (get_user(prop_id, props_ptr + copied_props)) {
1414                                 drm_mode_object_put(obj);
1415                                 ret = -EFAULT;
1416                                 goto out;
1417                         }
1418
1419                         prop = drm_mode_obj_find_prop_id(obj, prop_id);
1420                         if (!prop) {
1421                                 drm_mode_object_put(obj);
1422                                 ret = -ENOENT;
1423                                 goto out;
1424                         }
1425
1426                         if (copy_from_user(&prop_value,
1427                                            prop_values_ptr + copied_props,
1428                                            sizeof(prop_value))) {
1429                                 drm_mode_object_put(obj);
1430                                 ret = -EFAULT;
1431                                 goto out;
1432                         }
1433
1434                         ret = drm_atomic_set_property(state, file_priv,
1435                                                       obj, prop, prop_value);
1436                         if (ret) {
1437                                 drm_mode_object_put(obj);
1438                                 goto out;
1439                         }
1440
1441                         copied_props++;
1442                 }
1443
1444                 drm_mode_object_put(obj);
1445         }
1446
1447         ret = prepare_signaling(dev, state, arg, file_priv, &fence_state,
1448                                 &num_fences);
1449         if (ret)
1450                 goto out;
1451
1452         if (arg->flags & DRM_MODE_ATOMIC_TEST_ONLY) {
1453                 ret = drm_atomic_check_only(state);
1454         } else if (arg->flags & DRM_MODE_ATOMIC_NONBLOCK) {
1455                 ret = drm_atomic_nonblocking_commit(state);
1456         } else {
1457                 if (drm_debug_enabled(DRM_UT_STATE))
1458                         drm_atomic_print_new_state(state, &p);
1459
1460                 ret = drm_atomic_commit(state);
1461         }
1462
1463 out:
1464         complete_signaling(dev, state, fence_state, num_fences, !ret);
1465
1466         if (ret == -EDEADLK) {
1467                 drm_atomic_state_clear(state);
1468                 ret = drm_modeset_backoff(&ctx);
1469                 if (!ret)
1470                         goto retry;
1471         }
1472
1473         drm_atomic_state_put(state);
1474
1475         drm_modeset_drop_locks(&ctx);
1476         drm_modeset_acquire_fini(&ctx);
1477
1478         return ret;
1479 }