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                 struct drm_property_blob *blob;
  80
  81                 drm_mode_convert_to_umode(&umode, mode);
  82                 blob = drm_property_create_blob(crtc->dev,
  83                                                 sizeof(umode), &umode);
  84                 if (IS_ERR(blob))
  85                         return PTR_ERR(blob);
  86
  87                 drm_mode_copy(&state->mode, mode);
  88
  89                 state->mode_blob = blob;
  90                 state->enable = true;
  91                 drm_dbg_atomic(crtc->dev,
  92                                "Set [MODE:%s] for [CRTC:%d:%s] state %p\n",
  93                                mode->name, crtc->base.id, crtc->name, state);
  94         } else {
  95                 memset(&state->mode, 0, sizeof(state->mode));
  96                 state->enable = false;
  97                 drm_dbg_atomic(crtc->dev,
  98                                "Set [NOMODE] for [CRTC:%d:%s] state %p\n",
  99                                crtc->base.id, crtc->name, state);
 100         }
 101
 102         return 0;
 103 }
 104 EXPORT_SYMBOL(drm_atomic_set_mode_for_crtc);
 105
 106 /**
 107  * drm_atomic_set_mode_prop_for_crtc - set mode for CRTC
 108  * @state: the CRTC whose incoming state to update
 109  * @blob: pointer to blob property to use for mode
 110  *
 111  * Set a mode (originating from a blob property) on the desired CRTC state.
 112  * This function will take a reference on the blob property for the CRTC state,
 113  * and release the reference held on the state's existing mode property, if any
 114  * was set.
 115  *
 116  * RETURNS:
 117  * Zero on success, error code on failure. Cannot return -EDEADLK.
 118  */
 119 int drm_atomic_set_mode_prop_for_crtc(struct drm_crtc_state *state,
 120                                       struct drm_property_blob *blob)
 121 {
 122         struct drm_crtc *crtc = state->crtc;
 123
 124         if (blob == state->mode_blob)
 125                 return 0;
 126
 127         drm_property_blob_put(state->mode_blob);
 128         state->mode_blob = NULL;
 129
 130         memset(&state->mode, 0, sizeof(state->mode));
 131
 132         if (blob) {
 133                 int ret;
 134
 135                 if (blob->length != sizeof(struct drm_mode_modeinfo)) {
 136                         drm_dbg_atomic(crtc->dev,
 137                                        "[CRTC:%d:%s] bad mode blob length: %zu\n",
 138                                        crtc->base.id, crtc->name,
 139                                        blob->length);
 140                         return -EINVAL;
 141                 }
 142
 143                 ret = drm_mode_convert_umode(crtc->dev,
 144                                              &state->mode, blob->data);
 145                 if (ret) {
 146                         drm_dbg_atomic(crtc->dev,
 147                                        "[CRTC:%d:%s] invalid mode (ret=%d, status=%s):\n",
 148                                        crtc->base.id, crtc->name,
 149                                        ret, drm_get_mode_status_name(state->mode.status));
 150                         drm_mode_debug_printmodeline(&state->mode);
 151                         return -EINVAL;
 152                 }
 153
 154                 state->mode_blob = drm_property_blob_get(blob);
 155                 state->enable = true;
 156                 drm_dbg_atomic(crtc->dev,
 157                                "Set [MODE:%s] for [CRTC:%d:%s] state %p\n",
 158                                state->mode.name, crtc->base.id, crtc->name,
 159                                state);
 160         } else {
 161                 state->enable = false;
 162                 drm_dbg_atomic(crtc->dev,
 163                                "Set [NOMODE] for [CRTC:%d:%s] state %p\n",
 164                                crtc->base.id, crtc->name, state);
 165         }
 166
 167         return 0;
 168 }
 169 EXPORT_SYMBOL(drm_atomic_set_mode_prop_for_crtc);
 170
 171 /**
 172  * drm_atomic_set_crtc_for_plane - set CRTC for plane
 173  * @plane_state: the plane whose incoming state to update
 174  * @crtc: CRTC to use for the plane
 175  *
 176  * Changing the assigned CRTC for a plane requires us to grab the lock and state
 177  * for the new CRTC, as needed. This function takes care of all these details
 178  * besides updating the pointer in the state object itself.
 179  *
 180  * Returns:
 181  * 0 on success or can fail with -EDEADLK or -ENOMEM. When the error is EDEADLK
 182  * then the w/w mutex code has detected a deadlock and the entire atomic
 183  * sequence must be restarted. All other errors are fatal.
 184  */
 185 int
 186 drm_atomic_set_crtc_for_plane(struct drm_plane_state *plane_state,
 187                               struct drm_crtc *crtc)
 188 {
 189         struct drm_plane *plane = plane_state->plane;
 190         struct drm_crtc_state *crtc_state;
 191         /* Nothing to do for same crtc*/
 192         if (plane_state->crtc == crtc)
 193                 return 0;
 194         if (plane_state->crtc) {
 195                 crtc_state = drm_atomic_get_crtc_state(plane_state->state,
 196                                                        plane_state->crtc);
 197                 if (WARN_ON(IS_ERR(crtc_state)))
 198                         return PTR_ERR(crtc_state);
 199
 200                 crtc_state->plane_mask &= ~drm_plane_mask(plane);
 201         }
 202
 203         plane_state->crtc = crtc;
 204
 205         if (crtc) {
 206                 crtc_state = drm_atomic_get_crtc_state(plane_state->state,
 207                                                        crtc);
 208                 if (IS_ERR(crtc_state))
 209                         return PTR_ERR(crtc_state);
 210                 crtc_state->plane_mask |= drm_plane_mask(plane);
 211         }
 212
 213         if (crtc)
 214                 drm_dbg_atomic(plane->dev,
 215                                "Link [PLANE:%d:%s] state %p to [CRTC:%d:%s]\n",
 216                                plane->base.id, plane->name, plane_state,
 217                                crtc->base.id, crtc->name);
 218         else
 219                 drm_dbg_atomic(plane->dev,
 220                                "Link [PLANE:%d:%s] state %p to [NOCRTC]\n",
 221                                plane->base.id, plane->name, plane_state);
 222
 223         return 0;
 224 }
 225 EXPORT_SYMBOL(drm_atomic_set_crtc_for_plane);
 226
 227 /**
 228  * drm_atomic_set_fb_for_plane - set framebuffer for plane
 229  * @plane_state: atomic state object for the plane
 230  * @fb: fb to use for the plane
 231  *
 232  * Changing the assigned framebuffer for a plane requires us to grab a reference
 233  * to the new fb and drop the reference to the old fb, if there is one. This
 234  * function takes care of all these details besides updating the pointer in the
 235  * state object itself.
 236  */
 237 void
 238 drm_atomic_set_fb_for_plane(struct drm_plane_state *plane_state,
 239                             struct drm_framebuffer *fb)
 240 {
 241         struct drm_plane *plane = plane_state->plane;
 242
 243         if (fb)
 244                 drm_dbg_atomic(plane->dev,
 245                                "Set [FB:%d] for [PLANE:%d:%s] state %p\n",
 246                                fb->base.id, plane->base.id, plane->name,
 247                                plane_state);
 248         else
 249                 drm_dbg_atomic(plane->dev,
 250                                "Set [NOFB] for [PLANE:%d:%s] state %p\n",
 251                                plane->base.id, plane->name, plane_state);
 252
 253         drm_framebuffer_assign(&plane_state->fb, fb);
 254 }
 255 EXPORT_SYMBOL(drm_atomic_set_fb_for_plane);
 256
 257 /**
 258  * drm_atomic_set_fence_for_plane - set fence for plane
 259  * @plane_state: atomic state object for the plane
 260  * @fence: dma_fence to use for the plane
 261  *
 262  * Helper to setup the plane_state fence in case it is not set yet.
 263  * By using this drivers doesn't need to worry if the user choose
 264  * implicit or explicit fencing.
 265  *
 266  * This function will not set the fence to the state if it was set
 267  * via explicit fencing interfaces on the atomic ioctl. In that case it will
 268  * drop the reference to the fence as we are not storing it anywhere.
 269  * Otherwise, if &drm_plane_state.fence is not set this function we just set it
 270  * with the received implicit fence. In both cases this function consumes a
 271  * reference for @fence.
 272  *
 273  * This way explicit fencing can be used to overrule implicit fencing, which is
 274  * important to make explicit fencing use-cases work: One example is using one
 275  * buffer for 2 screens with different refresh rates. Implicit fencing will
 276  * clamp rendering to the refresh rate of the slower screen, whereas explicit
 277  * fence allows 2 independent render and display loops on a single buffer. If a
 278  * driver allows obeys both implicit and explicit fences for plane updates, then
 279  * it will break all the benefits of explicit fencing.
 280  */
 281 void
 282 drm_atomic_set_fence_for_plane(struct drm_plane_state *plane_state,
 283                                struct dma_fence *fence)
 284 {
 285         if (plane_state->fence) {
 286                 dma_fence_put(fence);
 287                 return;
 288         }
 289
 290         plane_state->fence = fence;
 291 }
 292 EXPORT_SYMBOL(drm_atomic_set_fence_for_plane);
 293
 294 /**
 295  * drm_atomic_set_crtc_for_connector - set CRTC for connector
 296  * @conn_state: atomic state object for the connector
 297  * @crtc: CRTC to use for the connector
 298  *
 299  * Changing the assigned CRTC for a connector requires us to grab the lock and
 300  * state for the new CRTC, as needed. This function takes care of all these
 301  * details besides updating the pointer in the state object itself.
 302  *
 303  * Returns:
 304  * 0 on success or can fail with -EDEADLK or -ENOMEM. When the error is EDEADLK
 305  * then the w/w mutex code has detected a deadlock and the entire atomic
 306  * sequence must be restarted. All other errors are fatal.
 307  */
 308 int
 309 drm_atomic_set_crtc_for_connector(struct drm_connector_state *conn_state,
 310                                   struct drm_crtc *crtc)
 311 {
 312         struct drm_connector *connector = conn_state->connector;
 313         struct drm_crtc_state *crtc_state;
 314
 315         if (conn_state->crtc == crtc)
 316                 return 0;
 317
 318         if (conn_state->crtc) {
 319                 crtc_state = drm_atomic_get_new_crtc_state(conn_state->state,
 320                                                            conn_state->crtc);
 321
 322                 crtc_state->connector_mask &=
 323                         ~drm_connector_mask(conn_state->connector);
 324
 325                 drm_connector_put(conn_state->connector);
 326                 conn_state->crtc = NULL;
 327         }
 328
 329         if (crtc) {
 330                 crtc_state = drm_atomic_get_crtc_state(conn_state->state, crtc);
 331                 if (IS_ERR(crtc_state))
 332                         return PTR_ERR(crtc_state);
 333
 334                 crtc_state->connector_mask |=
 335                         drm_connector_mask(conn_state->connector);
 336
 337                 drm_connector_get(conn_state->connector);
 338                 conn_state->crtc = crtc;
 339
 340                 drm_dbg_atomic(connector->dev,
 341                                "Link [CONNECTOR:%d:%s] state %p to [CRTC:%d:%s]\n",
 342                                connector->base.id, connector->name,
 343                                conn_state, crtc->base.id, crtc->name);
 344         } else {
 345                 drm_dbg_atomic(connector->dev,
 346                                "Link [CONNECTOR:%d:%s] state %p to [NOCRTC]\n",
 347                                connector->base.id, connector->name,
 348                                conn_state);
 349         }
 350
 351         return 0;
 352 }
 353 EXPORT_SYMBOL(drm_atomic_set_crtc_for_connector);
 354
 355 static void set_out_fence_for_crtc(struct drm_atomic_state *state,
 356                                    struct drm_crtc *crtc, s32 __user *fence_ptr)
 357 {
 358         state->crtcs[drm_crtc_index(crtc)].out_fence_ptr = fence_ptr;
 359 }
 360
 361 static s32 __user *get_out_fence_for_crtc(struct drm_atomic_state *state,
 362                                           struct drm_crtc *crtc)
 363 {
 364         s32 __user *fence_ptr;
 365
 366         fence_ptr = state->crtcs[drm_crtc_index(crtc)].out_fence_ptr;
 367         state->crtcs[drm_crtc_index(crtc)].out_fence_ptr = NULL;
 368
 369         return fence_ptr;
 370 }
 371
 372 static int set_out_fence_for_connector(struct drm_atomic_state *state,
 373                                         struct drm_connector *connector,
 374                                         s32 __user *fence_ptr)
 375 {
 376         unsigned int index = drm_connector_index(connector);
 377
 378         if (!fence_ptr)
 379                 return 0;
 380
 381         if (put_user(-1, fence_ptr))
 382                 return -EFAULT;
 383
 384         state->connectors[index].out_fence_ptr = fence_ptr;
 385
 386         return 0;
 387 }
 388
 389 static s32 __user *get_out_fence_for_connector(struct drm_atomic_state *state,
 390                                                struct drm_connector *connector)
 391 {
 392         unsigned int index = drm_connector_index(connector);
 393         s32 __user *fence_ptr;
 394
 395         fence_ptr = state->connectors[index].out_fence_ptr;
 396         state->connectors[index].out_fence_ptr = NULL;
 397
 398         return fence_ptr;
 399 }
 400
 401 static int
 402 drm_atomic_replace_property_blob_from_id(struct drm_device *dev,
 403                                          struct drm_property_blob **blob,
 404                                          uint64_t blob_id,
 405                                          ssize_t expected_size,
 406                                          ssize_t expected_elem_size,
 407                                          bool *replaced)
 408 {
 409         struct drm_property_blob *new_blob = NULL;
 410
 411         if (blob_id != 0) {
 412                 new_blob = drm_property_lookup_blob(dev, blob_id);
 413                 if (new_blob == NULL)
 414                         return -EINVAL;
 415
 416                 if (expected_size > 0 &&
 417                     new_blob->length != expected_size) {
 418                         drm_property_blob_put(new_blob);
 419                         return -EINVAL;
 420                 }
 421                 if (expected_elem_size > 0 &&
 422                     new_blob->length % expected_elem_size != 0) {
 423                         drm_property_blob_put(new_blob);
 424                         return -EINVAL;
 425                 }
 426         }
 427
 428         *replaced |= drm_property_replace_blob(blob, new_blob);
 429         drm_property_blob_put(new_blob);
 430
 431         return 0;
 432 }
 433
 434 static int drm_atomic_crtc_set_property(struct drm_crtc *crtc,
 435                 struct drm_crtc_state *state, struct drm_property *property,
 436                 uint64_t val)
 437 {
 438         struct drm_device *dev = crtc->dev;
 439         struct drm_mode_config *config = &dev->mode_config;
 440         bool replaced = false;
 441         int ret;
 442
 443         if (property == config->prop_active)
 444                 state->active = val;
 445         else if (property == config->prop_mode_id) {
 446                 struct drm_property_blob *mode =
 447                         drm_property_lookup_blob(dev, val);
 448                 ret = drm_atomic_set_mode_prop_for_crtc(state, mode);
 449                 drm_property_blob_put(mode);
 450                 return ret;
 451         } else if (property == config->prop_vrr_enabled) {
 452                 state->vrr_enabled = val;
 453         } else if (property == config->degamma_lut_property) {
 454                 ret = drm_atomic_replace_property_blob_from_id(dev,
 455                                         &state->degamma_lut,
 456                                         val,
 457                                         -1, sizeof(struct drm_color_lut),
 458                                         &replaced);
 459                 state->color_mgmt_changed |= replaced;
 460                 return ret;
 461         } else if (property == config->ctm_property) {
 462                 ret = drm_atomic_replace_property_blob_from_id(dev,
 463                                         &state->ctm,
 464                                         val,
 465                                         sizeof(struct drm_color_ctm), -1,
 466                                         &replaced);
 467                 state->color_mgmt_changed |= replaced;
 468                 return ret;
 469         } else if (property == config->gamma_lut_property) {
 470                 ret = drm_atomic_replace_property_blob_from_id(dev,
 471                                         &state->gamma_lut,
 472                                         val,
 473                                         -1, sizeof(struct drm_color_lut),
 474                                         &replaced);
 475                 state->color_mgmt_changed |= replaced;
 476                 return ret;
 477         } else if (property == config->prop_out_fence_ptr) {
 478                 s32 __user *fence_ptr = u64_to_user_ptr(val);
 479
 480                 if (!fence_ptr)
 481                         return 0;
 482
 483                 if (put_user(-1, fence_ptr))
 484                         return -EFAULT;
 485
 486                 set_out_fence_for_crtc(state->state, crtc, fence_ptr);
 487         } else if (property == crtc->scaling_filter_property) {
 488                 state->scaling_filter = val;
 489         } else if (crtc->funcs->atomic_set_property) {
 490                 return crtc->funcs->atomic_set_property(crtc, state, property, val);
 491         } else {
 492                 drm_dbg_atomic(crtc->dev,
 493                                "[CRTC:%d:%s] unknown property [PROP:%d:%s]]\n",
 494                                crtc->base.id, crtc->name,
 495                                property->base.id, property->name);
 496                 return -EINVAL;
 497         }
 498
 499         return 0;
 500 }
 501
 502 static int
 503 drm_atomic_crtc_get_property(struct drm_crtc *crtc,
 504                 const struct drm_crtc_state *state,
 505                 struct drm_property *property, uint64_t *val)
 506 {
 507         struct drm_device *dev = crtc->dev;
 508         struct drm_mode_config *config = &dev->mode_config;
 509
 510         if (property == config->prop_active)
 511                 *val = drm_atomic_crtc_effectively_active(state);
 512         else if (property == config->prop_mode_id)
 513                 *val = (state->mode_blob) ? state->mode_blob->base.id : 0;
 514         else if (property == config->prop_vrr_enabled)
 515                 *val = state->vrr_enabled;
 516         else if (property == config->degamma_lut_property)
 517                 *val = (state->degamma_lut) ? state->degamma_lut->base.id : 0;
 518         else if (property == config->ctm_property)
 519                 *val = (state->ctm) ? state->ctm->base.id : 0;
 520         else if (property == config->gamma_lut_property)
 521                 *val = (state->gamma_lut) ? state->gamma_lut->base.id : 0;
 522         else if (property == config->prop_out_fence_ptr)
 523                 *val = 0;
 524         else if (property == crtc->scaling_filter_property)
 525                 *val = state->scaling_filter;
 526         else if (crtc->funcs->atomic_get_property)
 527                 return crtc->funcs->atomic_get_property(crtc, state, property, val);
 528         else
 529                 return -EINVAL;
 530
 531         return 0;
 532 }
 533
 534 static int drm_atomic_plane_set_property(struct drm_plane *plane,
 535                 struct drm_plane_state *state, struct drm_file *file_priv,
 536                 struct drm_property *property, uint64_t val)
 537 {
 538         struct drm_device *dev = plane->dev;
 539         struct drm_mode_config *config = &dev->mode_config;
 540         bool replaced = false;
 541         int ret;
 542
 543         if (property == config->prop_fb_id) {
 544                 struct drm_framebuffer *fb;
 545
 546                 fb = drm_framebuffer_lookup(dev, file_priv, val);
 547                 drm_atomic_set_fb_for_plane(state, fb);
 548                 if (fb)
 549                         drm_framebuffer_put(fb);
 550         } else if (property == config->prop_in_fence_fd) {
 551                 if (state->fence)
 552                         return -EINVAL;
 553
 554                 if (U642I64(val) == -1)
 555                         return 0;
 556
 557                 state->fence = sync_file_get_fence(val);
 558                 if (!state->fence)
 559                         return -EINVAL;
 560
 561         } else if (property == config->prop_crtc_id) {
 562                 struct drm_crtc *crtc = drm_crtc_find(dev, file_priv, val);
 563
 564                 if (val && !crtc)
 565                         return -EACCES;
 566                 return drm_atomic_set_crtc_for_plane(state, crtc);
 567         } else if (property == config->prop_crtc_x) {
 568                 state->crtc_x = U642I64(val);
 569         } else if (property == config->prop_crtc_y) {
 570                 state->crtc_y = U642I64(val);
 571         } else if (property == config->prop_crtc_w) {
 572                 state->crtc_w = val;
 573         } else if (property == config->prop_crtc_h) {
 574                 state->crtc_h = val;
 575         } else if (property == config->prop_src_x) {
 576                 state->src_x = val;
 577         } else if (property == config->prop_src_y) {
 578                 state->src_y = val;
 579         } else if (property == config->prop_src_w) {
 580                 state->src_w = val;
 581         } else if (property == config->prop_src_h) {
 582                 state->src_h = val;
 583         } else if (property == plane->alpha_property) {
 584                 state->alpha = val;
 585         } else if (property == plane->blend_mode_property) {
 586                 state->pixel_blend_mode = val;
 587         } else if (property == plane->rotation_property) {
 588                 if (!is_power_of_2(val & DRM_MODE_ROTATE_MASK)) {
 589                         drm_dbg_atomic(plane->dev,
 590                                        "[PLANE:%d:%s] bad rotation bitmask: 0x%llx\n",
 591                                        plane->base.id, plane->name, val);
 592                         return -EINVAL;
 593                 }
 594                 state->rotation = val;
 595         } else if (property == plane->zpos_property) {
 596                 state->zpos = val;
 597         } else if (property == plane->color_encoding_property) {
 598                 state->color_encoding = val;
 599         } else if (property == plane->color_range_property) {
 600                 state->color_range = val;
 601         } else if (property == config->prop_fb_damage_clips) {
 602                 ret = drm_atomic_replace_property_blob_from_id(dev,
 603                                         &state->fb_damage_clips,
 604                                         val,
 605                                         -1,
 606                                         sizeof(struct drm_rect),
 607                                         &replaced);
 608                 return ret;
 609         } else if (property == plane->scaling_filter_property) {
 610                 state->scaling_filter = val;
 611         } else if (plane->funcs->atomic_set_property) {
 612                 return plane->funcs->atomic_set_property(plane, state,
 613                                 property, val);
 614         } else {
 615                 drm_dbg_atomic(plane->dev,
 616                                "[PLANE:%d:%s] unknown property [PROP:%d:%s]]\n",
 617                                plane->base.id, plane->name,
 618                                property->base.id, property->name);
 619                 return -EINVAL;
 620         }
 621
 622         return 0;
 623 }
 624
 625 static int
 626 drm_atomic_plane_get_property(struct drm_plane *plane,
 627                 const struct drm_plane_state *state,
 628                 struct drm_property *property, uint64_t *val)
 629 {
 630         struct drm_device *dev = plane->dev;
 631         struct drm_mode_config *config = &dev->mode_config;
 632
 633         if (property == config->prop_fb_id) {
 634                 *val = (state->fb) ? state->fb->base.id : 0;
 635         } else if (property == config->prop_in_fence_fd) {
 636                 *val = -1;
 637         } else if (property == config->prop_crtc_id) {
 638                 *val = (state->crtc) ? state->crtc->base.id : 0;
 639         } else if (property == config->prop_crtc_x) {
 640                 *val = I642U64(state->crtc_x);
 641         } else if (property == config->prop_crtc_y) {
 642                 *val = I642U64(state->crtc_y);
 643         } else if (property == config->prop_crtc_w) {
 644                 *val = state->crtc_w;
 645         } else if (property == config->prop_crtc_h) {
 646                 *val = state->crtc_h;
 647         } else if (property == config->prop_src_x) {
 648                 *val = state->src_x;
 649         } else if (property == config->prop_src_y) {
 650                 *val = state->src_y;
 651         } else if (property == config->prop_src_w) {
 652                 *val = state->src_w;
 653         } else if (property == config->prop_src_h) {
 654                 *val = state->src_h;
 655         } else if (property == plane->alpha_property) {
 656                 *val = state->alpha;
 657         } else if (property == plane->blend_mode_property) {
 658                 *val = state->pixel_blend_mode;
 659         } else if (property == plane->rotation_property) {
 660                 *val = state->rotation;
 661         } else if (property == plane->zpos_property) {
 662                 *val = state->zpos;
 663         } else if (property == plane->color_encoding_property) {
 664                 *val = state->color_encoding;
 665         } else if (property == plane->color_range_property) {
 666                 *val = state->color_range;
 667         } else if (property == config->prop_fb_damage_clips) {
 668                 *val = (state->fb_damage_clips) ?
 669                         state->fb_damage_clips->base.id : 0;
 670         } else if (property == plane->scaling_filter_property) {
 671                 *val = state->scaling_filter;
 672         } else if (plane->funcs->atomic_get_property) {
 673                 return plane->funcs->atomic_get_property(plane, state, property, val);
 674         } else {
 675                 return -EINVAL;
 676         }
 677
 678         return 0;
 679 }
 680
 681 static int drm_atomic_set_writeback_fb_for_connector(
 682                 struct drm_connector_state *conn_state,
 683                 struct drm_framebuffer *fb)
 684 {
 685         int ret;
 686         struct drm_connector *conn = conn_state->connector;
 687
 688         ret = drm_writeback_set_fb(conn_state, fb);
 689         if (ret < 0)
 690                 return ret;
 691
 692         if (fb)
 693                 drm_dbg_atomic(conn->dev,
 694                                "Set [FB:%d] for connector state %p\n",
 695                                fb->base.id, conn_state);
 696         else
 697                 drm_dbg_atomic(conn->dev,
 698                                "Set [NOFB] for connector state %p\n",
 699                                conn_state);
 700
 701         return 0;
 702 }
 703
 704 static int drm_atomic_connector_set_property(struct drm_connector *connector,
 705                 struct drm_connector_state *state, struct drm_file *file_priv,
 706                 struct drm_property *property, uint64_t val)
 707 {
 708         struct drm_device *dev = connector->dev;
 709         struct drm_mode_config *config = &dev->mode_config;
 710         bool replaced = false;
 711         int ret;
 712
 713         if (property == config->prop_crtc_id) {
 714                 struct drm_crtc *crtc = drm_crtc_find(dev, file_priv, val);
 715
 716                 if (val && !crtc)
 717                         return -EACCES;
 718                 return drm_atomic_set_crtc_for_connector(state, crtc);
 719         } else if (property == config->dpms_property) {
 720                 /* setting DPMS property requires special handling, which
 721                  * is done in legacy setprop path for us.  Disallow (for
 722                  * now?) atomic writes to DPMS property:
 723                  */
 724                 return -EINVAL;
 725         } else if (property == config->tv_select_subconnector_property) {
 726                 state->tv.subconnector = val;
 727         } else if (property == config->tv_left_margin_property) {
 728                 state->tv.margins.left = val;
 729         } else if (property == config->tv_right_margin_property) {
 730                 state->tv.margins.right = val;
 731         } else if (property == config->tv_top_margin_property) {
 732                 state->tv.margins.top = val;
 733         } else if (property == config->tv_bottom_margin_property) {
 734                 state->tv.margins.bottom = val;
 735         } else if (property == config->tv_mode_property) {
 736                 state->tv.mode = val;
 737         } else if (property == config->tv_brightness_property) {
 738                 state->tv.brightness = val;
 739         } else if (property == config->tv_contrast_property) {
 740                 state->tv.contrast = val;
 741         } else if (property == config->tv_flicker_reduction_property) {
 742                 state->tv.flicker_reduction = val;
 743         } else if (property == config->tv_overscan_property) {
 744                 state->tv.overscan = val;
 745         } else if (property == config->tv_saturation_property) {
 746                 state->tv.saturation = val;
 747         } else if (property == config->tv_hue_property) {
 748                 state->tv.hue = val;
 749         } else if (property == config->link_status_property) {
 750                 /* Never downgrade from GOOD to BAD on userspace's request here,
 751                  * only hw issues can do that.
 752                  *
 753                  * For an atomic property the userspace doesn't need to be able
 754                  * to understand all the properties, but needs to be able to
 755                  * restore the state it wants on VT switch. So if the userspace
 756                  * tries to change the link_status from GOOD to BAD, driver
 757                  * silently rejects it and returns a 0. This prevents userspace
 758                  * from accidentally breaking  the display when it restores the
 759                  * state.
 760                  */
 761                 if (state->link_status != DRM_LINK_STATUS_GOOD)
 762                         state->link_status = val;
 763         } else if (property == config->hdr_output_metadata_property) {
 764                 ret = drm_atomic_replace_property_blob_from_id(dev,
 765                                 &state->hdr_output_metadata,
 766                                 val,
 767                                 sizeof(struct hdr_output_metadata), -1,
 768                                 &replaced);
 769                 return ret;
 770         } else if (property == config->aspect_ratio_property) {
 771                 state->picture_aspect_ratio = val;
 772         } else if (property == config->content_type_property) {
 773                 state->content_type = val;
 774         } else if (property == connector->scaling_mode_property) {
 775                 state->scaling_mode = val;
 776         } else if (property == config->content_protection_property) {
 777                 if (val == DRM_MODE_CONTENT_PROTECTION_ENABLED) {
 778                         drm_dbg_kms(dev, "only drivers can set CP Enabled\n");
 779                         return -EINVAL;
 780                 }
 781                 state->content_protection = val;
 782         } else if (property == config->hdcp_content_type_property) {
 783                 state->hdcp_content_type = val;
 784         } else if (property == connector->colorspace_property) {
 785                 state->colorspace = val;
 786         } else if (property == config->writeback_fb_id_property) {
 787                 struct drm_framebuffer *fb;
 788                 int ret;
 789
 790                 fb = drm_framebuffer_lookup(dev, file_priv, val);
 791                 ret = drm_atomic_set_writeback_fb_for_connector(state, fb);
 792                 if (fb)
 793                         drm_framebuffer_put(fb);
 794                 return ret;
 795         } else if (property == config->writeback_out_fence_ptr_property) {
 796                 s32 __user *fence_ptr = u64_to_user_ptr(val);
 797
 798                 return set_out_fence_for_connector(state->state, connector,
 799                                                    fence_ptr);
 800         } else if (property == connector->max_bpc_property) {
 801                 state->max_requested_bpc = val;
 802         } else if (property == connector->privacy_screen_sw_state_property) {
 803                 state->privacy_screen_sw_state = val;
 804         } else if (connector->funcs->atomic_set_property) {
 805                 return connector->funcs->atomic_set_property(connector,
 806                                 state, property, val);
 807         } else {
 808                 drm_dbg_atomic(connector->dev,
 809                                "[CONNECTOR:%d:%s] unknown property [PROP:%d:%s]]\n",
 810                                connector->base.id, connector->name,
 811                                property->base.id, property->name);
 812                 return -EINVAL;
 813         }
 814
 815         return 0;
 816 }
 817
 818 static int
 819 drm_atomic_connector_get_property(struct drm_connector *connector,
 820                 const struct drm_connector_state *state,
 821                 struct drm_property *property, uint64_t *val)
 822 {
 823         struct drm_device *dev = connector->dev;
 824         struct drm_mode_config *config = &dev->mode_config;
 825
 826         if (property == config->prop_crtc_id) {
 827                 *val = (state->crtc) ? state->crtc->base.id : 0;
 828         } else if (property == config->dpms_property) {
 829                 if (state->crtc && state->crtc->state->self_refresh_active)
 830                         *val = DRM_MODE_DPMS_ON;
 831                 else
 832                         *val = connector->dpms;
 833         } else if (property == config->tv_select_subconnector_property) {
 834                 *val = state->tv.subconnector;
 835         } else if (property == config->tv_left_margin_property) {
 836                 *val = state->tv.margins.left;
 837         } else if (property == config->tv_right_margin_property) {
 838                 *val = state->tv.margins.right;
 839         } else if (property == config->tv_top_margin_property) {
 840                 *val = state->tv.margins.top;
 841         } else if (property == config->tv_bottom_margin_property) {
 842                 *val = state->tv.margins.bottom;
 843         } else if (property == config->tv_mode_property) {
 844                 *val = state->tv.mode;
 845         } else if (property == config->tv_brightness_property) {
 846                 *val = state->tv.brightness;
 847         } else if (property == config->tv_contrast_property) {
 848                 *val = state->tv.contrast;
 849         } else if (property == config->tv_flicker_reduction_property) {
 850                 *val = state->tv.flicker_reduction;
 851         } else if (property == config->tv_overscan_property) {
 852                 *val = state->tv.overscan;
 853         } else if (property == config->tv_saturation_property) {
 854                 *val = state->tv.saturation;
 855         } else if (property == config->tv_hue_property) {
 856                 *val = state->tv.hue;
 857         } else if (property == config->link_status_property) {
 858                 *val = state->link_status;
 859         } else if (property == config->aspect_ratio_property) {
 860                 *val = state->picture_aspect_ratio;
 861         } else if (property == config->content_type_property) {
 862                 *val = state->content_type;
 863         } else if (property == connector->colorspace_property) {
 864                 *val = state->colorspace;
 865         } else if (property == connector->scaling_mode_property) {
 866                 *val = state->scaling_mode;
 867         } else if (property == config->hdr_output_metadata_property) {
 868                 *val = state->hdr_output_metadata ?
 869                         state->hdr_output_metadata->base.id : 0;
 870         } else if (property == config->content_protection_property) {
 871                 *val = state->content_protection;
 872         } else if (property == config->hdcp_content_type_property) {
 873                 *val = state->hdcp_content_type;
 874         } else if (property == config->writeback_fb_id_property) {
 875                 /* Writeback framebuffer is one-shot, write and forget */
 876                 *val = 0;
 877         } else if (property == config->writeback_out_fence_ptr_property) {
 878                 *val = 0;
 879         } else if (property == connector->max_bpc_property) {
 880                 *val = state->max_requested_bpc;
 881         } else if (property == connector->privacy_screen_sw_state_property) {
 882                 *val = state->privacy_screen_sw_state;
 883         } else if (connector->funcs->atomic_get_property) {
 884                 return connector->funcs->atomic_get_property(connector,
 885                                 state, property, val);
 886         } else {
 887                 return -EINVAL;
 888         }
 889
 890         return 0;
 891 }
 892
 893 int drm_atomic_get_property(struct drm_mode_object *obj,
 894                 struct drm_property *property, uint64_t *val)
 895 {
 896         struct drm_device *dev = property->dev;
 897         int ret;
 898
 899         switch (obj->type) {
 900         case DRM_MODE_OBJECT_CONNECTOR: {
 901                 struct drm_connector *connector = obj_to_connector(obj);
 902
 903                 WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
 904                 ret = drm_atomic_connector_get_property(connector,
 905                                 connector->state, property, val);
 906                 break;
 907         }
 908         case DRM_MODE_OBJECT_CRTC: {
 909                 struct drm_crtc *crtc = obj_to_crtc(obj);
 910
 911                 WARN_ON(!drm_modeset_is_locked(&crtc->mutex));
 912                 ret = drm_atomic_crtc_get_property(crtc,
 913                                 crtc->state, property, val);
 914                 break;
 915         }
 916         case DRM_MODE_OBJECT_PLANE: {
 917                 struct drm_plane *plane = obj_to_plane(obj);
 918
 919                 WARN_ON(!drm_modeset_is_locked(&plane->mutex));
 920                 ret = drm_atomic_plane_get_property(plane,
 921                                 plane->state, property, val);
 922                 break;
 923         }
 924         default:
 925                 ret = -EINVAL;
 926                 break;
 927         }
 928
 929         return ret;
 930 }
 931
 932 /*
 933  * The big monster ioctl
 934  */
 935
 936 static struct drm_pending_vblank_event *create_vblank_event(
 937                 struct drm_crtc *crtc, uint64_t user_data)
 938 {
 939         struct drm_pending_vblank_event *e = NULL;
 940
 941         e = kzalloc(sizeof *e, GFP_KERNEL);
 942         if (!e)
 943                 return NULL;
 944
 945         e->event.base.type = DRM_EVENT_FLIP_COMPLETE;
 946         e->event.base.length = sizeof(e->event);
 947         e->event.vbl.crtc_id = crtc->base.id;
 948         e->event.vbl.user_data = user_data;
 949
 950         return e;
 951 }
 952
 953 int drm_atomic_connector_commit_dpms(struct drm_atomic_state *state,
 954                                      struct drm_connector *connector,
 955                                      int mode)
 956 {
 957         struct drm_connector *tmp_connector;
 958         struct drm_connector_state *new_conn_state;
 959         struct drm_crtc *crtc;
 960         struct drm_crtc_state *crtc_state;
 961         int i, ret, old_mode = connector->dpms;
 962         bool active = false;
 963
 964         ret = drm_modeset_lock(&state->dev->mode_config.connection_mutex,
 965                                state->acquire_ctx);
 966         if (ret)
 967                 return ret;
 968
 969         if (mode != DRM_MODE_DPMS_ON)
 970                 mode = DRM_MODE_DPMS_OFF;
 971         connector->dpms = mode;
 972
 973         crtc = connector->state->crtc;
 974         if (!crtc)
 975                 goto out;
 976         ret = drm_atomic_add_affected_connectors(state, crtc);
 977         if (ret)
 978                 goto out;
 979
 980         crtc_state = drm_atomic_get_crtc_state(state, crtc);
 981         if (IS_ERR(crtc_state)) {
 982                 ret = PTR_ERR(crtc_state);
 983                 goto out;
 984         }
 985
 986         for_each_new_connector_in_state(state, tmp_connector, new_conn_state, i) {
 987                 if (new_conn_state->crtc != crtc)
 988                         continue;
 989                 if (tmp_connector->dpms == DRM_MODE_DPMS_ON) {
 990                         active = true;
 991                         break;
 992                 }
 993         }
 994
 995         crtc_state->active = active;
 996         ret = drm_atomic_commit(state);
 997 out:
 998         if (ret != 0)
 999                 connector->dpms = old_mode;
1000         return ret;
1001 }
1002
1003 int drm_atomic_set_property(struct drm_atomic_state *state,
1004                             struct drm_file *file_priv,
1005                             struct drm_mode_object *obj,
1006                             struct drm_property *prop,
1007                             uint64_t prop_value)
1008 {
1009         struct drm_mode_object *ref;
1010         int ret;
1011
1012         if (!drm_property_change_valid_get(prop, prop_value, &ref))
1013                 return -EINVAL;
1014
1015         switch (obj->type) {
1016         case DRM_MODE_OBJECT_CONNECTOR: {
1017                 struct drm_connector *connector = obj_to_connector(obj);
1018                 struct drm_connector_state *connector_state;
1019
1020                 connector_state = drm_atomic_get_connector_state(state, connector);
1021                 if (IS_ERR(connector_state)) {
1022                         ret = PTR_ERR(connector_state);
1023                         break;
1024                 }
1025
1026                 ret = drm_atomic_connector_set_property(connector,
1027                                 connector_state, file_priv,
1028                                 prop, prop_value);
1029                 break;
1030         }
1031         case DRM_MODE_OBJECT_CRTC: {
1032                 struct drm_crtc *crtc = obj_to_crtc(obj);
1033                 struct drm_crtc_state *crtc_state;
1034
1035                 crtc_state = drm_atomic_get_crtc_state(state, crtc);
1036                 if (IS_ERR(crtc_state)) {
1037                         ret = PTR_ERR(crtc_state);
1038                         break;
1039                 }
1040
1041                 ret = drm_atomic_crtc_set_property(crtc,
1042                                 crtc_state, prop, prop_value);
1043                 break;
1044         }
1045         case DRM_MODE_OBJECT_PLANE: {
1046                 struct drm_plane *plane = obj_to_plane(obj);
1047                 struct drm_plane_state *plane_state;
1048
1049                 plane_state = drm_atomic_get_plane_state(state, plane);
1050                 if (IS_ERR(plane_state)) {
1051                         ret = PTR_ERR(plane_state);
1052                         break;
1053                 }
1054
1055                 ret = drm_atomic_plane_set_property(plane,
1056                                 plane_state, file_priv,
1057                                 prop, prop_value);
1058                 break;
1059         }
1060         default:
1061                 ret = -EINVAL;
1062                 break;
1063         }
1064
1065         drm_property_change_valid_put(prop, ref);
1066         return ret;
1067 }
1068
1069 /**
1070  * DOC: explicit fencing properties
1071  *
1072  * Explicit fencing allows userspace to control the buffer synchronization
1073  * between devices. A Fence or a group of fences are transferred to/from
1074  * userspace using Sync File fds and there are two DRM properties for that.
1075  * IN_FENCE_FD on each DRM Plane to send fences to the kernel and
1076  * OUT_FENCE_PTR on each DRM CRTC to receive fences from the kernel.
1077  *
1078  * As a contrast, with implicit fencing the kernel keeps track of any
1079  * ongoing rendering, and automatically ensures that the atomic update waits
1080  * for any pending rendering to complete. For shared buffers represented with
1081  * a &struct dma_buf this is tracked in &struct dma_resv.
1082  * Implicit syncing is how Linux traditionally worked (e.g. DRI2/3 on X.org),
1083  * whereas explicit fencing is what Android wants.
1084  *
1085  * "IN_FENCE_FD”:
1086  *      Use this property to pass a fence that DRM should wait on before
1087  *      proceeding with the Atomic Commit request and show the framebuffer for
1088  *      the plane on the screen. The fence can be either a normal fence or a
1089  *      merged one, the sync_file framework will handle both cases and use a
1090  *      fence_array if a merged fence is received. Passing -1 here means no
1091  *      fences to wait on.
1092  *
1093  *      If the Atomic Commit request has the DRM_MODE_ATOMIC_TEST_ONLY flag
1094  *      it will only check if the Sync File is a valid one.
1095  *
1096  *      On the driver side the fence is stored on the @fence parameter of
1097  *      &struct drm_plane_state. Drivers which also support implicit fencing
1098  *      should set the implicit fence using drm_atomic_set_fence_for_plane(),
1099  *      to make sure there's consistent behaviour between drivers in precedence
1100  *      of implicit vs. explicit fencing.
1101  *
1102  * "OUT_FENCE_PTR”:
1103  *      Use this property to pass a file descriptor pointer to DRM. Once the
1104  *      Atomic Commit request call returns OUT_FENCE_PTR will be filled with
1105  *      the file descriptor number of a Sync File. This Sync File contains the
1106  *      CRTC fence that will be signaled when all framebuffers present on the
1107  *      Atomic Commit * request for that given CRTC are scanned out on the
1108  *      screen.
1109  *
1110  *      The Atomic Commit request fails if a invalid pointer is passed. If the
1111  *      Atomic Commit request fails for any other reason the out fence fd
1112  *      returned will be -1. On a Atomic Commit with the
1113  *      DRM_MODE_ATOMIC_TEST_ONLY flag the out fence will also be set to -1.
1114  *
1115  *      Note that out-fences don't have a special interface to drivers and are
1116  *      internally represented by a &struct drm_pending_vblank_event in struct
1117  *      &drm_crtc_state, which is also used by the nonblocking atomic commit
1118  *      helpers and for the DRM event handling for existing userspace.
1119  */
1120
1121 struct drm_out_fence_state {
1122         s32 __user *out_fence_ptr;
1123         struct sync_file *sync_file;
1124         int fd;
1125 };
1126
1127 static int setup_out_fence(struct drm_out_fence_state *fence_state,
1128                            struct dma_fence *fence)
1129 {
1130         fence_state->fd = get_unused_fd_flags(O_CLOEXEC);
1131         if (fence_state->fd < 0)
1132                 return fence_state->fd;
1133
1134         if (put_user(fence_state->fd, fence_state->out_fence_ptr))
1135                 return -EFAULT;
1136
1137         fence_state->sync_file = sync_file_create(fence);
1138         if (!fence_state->sync_file)
1139                 return -ENOMEM;
1140
1141         return 0;
1142 }
1143
1144 static int prepare_signaling(struct drm_device *dev,
1145                                   struct drm_atomic_state *state,
1146                                   struct drm_mode_atomic *arg,
1147                                   struct drm_file *file_priv,
1148                                   struct drm_out_fence_state **fence_state,
1149                                   unsigned int *num_fences)
1150 {
1151         struct drm_crtc *crtc;
1152         struct drm_crtc_state *crtc_state;
1153         struct drm_connector *conn;
1154         struct drm_connector_state *conn_state;
1155         int i, c = 0, ret;
1156
1157         if (arg->flags & DRM_MODE_ATOMIC_TEST_ONLY)
1158                 return 0;
1159
1160         for_each_new_crtc_in_state(state, crtc, crtc_state, i) {
1161                 s32 __user *fence_ptr;
1162
1163                 fence_ptr = get_out_fence_for_crtc(crtc_state->state, crtc);
1164
1165                 if (arg->flags & DRM_MODE_PAGE_FLIP_EVENT || fence_ptr) {
1166                         struct drm_pending_vblank_event *e;
1167
1168                         e = create_vblank_event(crtc, arg->user_data);
1169                         if (!e)
1170                                 return -ENOMEM;
1171
1172                         crtc_state->event = e;
1173                 }
1174
1175                 if (arg->flags & DRM_MODE_PAGE_FLIP_EVENT) {
1176                         struct drm_pending_vblank_event *e = crtc_state->event;
1177
1178                         if (!file_priv)
1179                                 continue;
1180
1181                         ret = drm_event_reserve_init(dev, file_priv, &e->base,
1182                                                      &e->event.base);
1183                         if (ret) {
1184                                 kfree(e);
1185                                 crtc_state->event = NULL;
1186                                 return ret;
1187                         }
1188                 }
1189
1190                 if (fence_ptr) {
1191                         struct dma_fence *fence;
1192                         struct drm_out_fence_state *f;
1193
1194                         f = krealloc(*fence_state, sizeof(**fence_state) *
1195                                      (*num_fences + 1), GFP_KERNEL);
1196                         if (!f)
1197                                 return -ENOMEM;
1198
1199                         memset(&f[*num_fences], 0, sizeof(*f));
1200
1201                         f[*num_fences].out_fence_ptr = fence_ptr;
1202                         *fence_state = f;
1203
1204                         fence = drm_crtc_create_fence(crtc);
1205                         if (!fence)
1206                                 return -ENOMEM;
1207
1208                         ret = setup_out_fence(&f[(*num_fences)++], fence);
1209                         if (ret) {
1210                                 dma_fence_put(fence);
1211                                 return ret;
1212                         }
1213
1214                         crtc_state->event->base.fence = fence;
1215                 }
1216
1217                 c++;
1218         }
1219
1220         for_each_new_connector_in_state(state, conn, conn_state, i) {
1221                 struct drm_writeback_connector *wb_conn;
1222                 struct drm_out_fence_state *f;
1223                 struct dma_fence *fence;
1224                 s32 __user *fence_ptr;
1225
1226                 if (!conn_state->writeback_job)
1227                         continue;
1228
1229                 fence_ptr = get_out_fence_for_connector(state, conn);
1230                 if (!fence_ptr)
1231                         continue;
1232
1233                 f = krealloc(*fence_state, sizeof(**fence_state) *
1234                              (*num_fences + 1), GFP_KERNEL);
1235                 if (!f)
1236                         return -ENOMEM;
1237
1238                 memset(&f[*num_fences], 0, sizeof(*f));
1239
1240                 f[*num_fences].out_fence_ptr = fence_ptr;
1241                 *fence_state = f;
1242
1243                 wb_conn = drm_connector_to_writeback(conn);
1244                 fence = drm_writeback_get_out_fence(wb_conn);
1245                 if (!fence)
1246                         return -ENOMEM;
1247
1248                 ret = setup_out_fence(&f[(*num_fences)++], fence);
1249                 if (ret) {
1250                         dma_fence_put(fence);
1251                         return ret;
1252                 }
1253
1254                 conn_state->writeback_job->out_fence = fence;
1255         }
1256
1257         /*
1258          * Having this flag means user mode pends on event which will never
1259          * reach due to lack of at least one CRTC for signaling
1260          */
1261         if (c == 0 && (arg->flags & DRM_MODE_PAGE_FLIP_EVENT))
1262                 return -EINVAL;
1263
1264         return 0;
1265 }
1266
1267 static void complete_signaling(struct drm_device *dev,
1268                                struct drm_atomic_state *state,
1269                                struct drm_out_fence_state *fence_state,
1270                                unsigned int num_fences,
1271                                bool install_fds)
1272 {
1273         struct drm_crtc *crtc;
1274         struct drm_crtc_state *crtc_state;
1275         int i;
1276
1277         if (install_fds) {
1278                 for (i = 0; i < num_fences; i++)
1279                         fd_install(fence_state[i].fd,
1280                                    fence_state[i].sync_file->file);
1281
1282                 kfree(fence_state);
1283                 return;
1284         }
1285
1286         for_each_new_crtc_in_state(state, crtc, crtc_state, i) {
1287                 struct drm_pending_vblank_event *event = crtc_state->event;
1288                 /*
1289                  * Free the allocated event. drm_atomic_helper_setup_commit
1290                  * can allocate an event too, so only free it if it's ours
1291                  * to prevent a double free in drm_atomic_state_clear.
1292                  */
1293                 if (event && (event->base.fence || event->base.file_priv)) {
1294                         drm_event_cancel_free(dev, &event->base);
1295                         crtc_state->event = NULL;
1296                 }
1297         }
1298
1299         if (!fence_state)
1300                 return;
1301
1302         for (i = 0; i < num_fences; i++) {
1303                 if (fence_state[i].sync_file)
1304                         fput(fence_state[i].sync_file->file);
1305                 if (fence_state[i].fd >= 0)
1306                         put_unused_fd(fence_state[i].fd);
1307
1308                 /* If this fails log error to the user */
1309                 if (fence_state[i].out_fence_ptr &&
1310                     put_user(-1, fence_state[i].out_fence_ptr))
1311                         drm_dbg_atomic(dev, "Couldn't clear out_fence_ptr\n");
1312         }
1313
1314         kfree(fence_state);
1315 }
1316
1317 int drm_mode_atomic_ioctl(struct drm_device *dev,
1318                           void *data, struct drm_file *file_priv)
1319 {
1320         struct drm_mode_atomic *arg = data;
1321         uint32_t __user *objs_ptr = (uint32_t __user *)(unsigned long)(arg->objs_ptr);
1322         uint32_t __user *count_props_ptr = (uint32_t __user *)(unsigned long)(arg->count_props_ptr);
1323         uint32_t __user *props_ptr = (uint32_t __user *)(unsigned long)(arg->props_ptr);
1324         uint64_t __user *prop_values_ptr = (uint64_t __user *)(unsigned long)(arg->prop_values_ptr);
1325         unsigned int copied_objs, copied_props;
1326         struct drm_atomic_state *state;
1327         struct drm_modeset_acquire_ctx ctx;
1328         struct drm_out_fence_state *fence_state;
1329         int ret = 0;
1330         unsigned int i, j, num_fences;
1331         struct drm_printer p = drm_info_printer(dev->dev);
1332
1333         /* disallow for drivers not supporting atomic: */
1334         if (!drm_core_check_feature(dev, DRIVER_ATOMIC))
1335                 return -EOPNOTSUPP;
1336
1337         /* disallow for userspace that has not enabled atomic cap (even
1338          * though this may be a bit overkill, since legacy userspace
1339          * wouldn't know how to call this ioctl)
1340          */
1341         if (!file_priv->atomic) {
1342                 drm_dbg_atomic(dev,
1343                                "commit failed: atomic cap not enabled\n");
1344                 return -EINVAL;
1345         }
1346
1347         if (arg->flags & ~DRM_MODE_ATOMIC_FLAGS) {
1348                 drm_dbg_atomic(dev, "commit failed: invalid flag\n");
1349                 return -EINVAL;
1350         }
1351
1352         if (arg->reserved) {
1353                 drm_dbg_atomic(dev, "commit failed: reserved field set\n");
1354                 return -EINVAL;
1355         }
1356
1357         if (arg->flags & DRM_MODE_PAGE_FLIP_ASYNC) {
1358                 drm_dbg_atomic(dev,
1359                                "commit failed: invalid flag DRM_MODE_PAGE_FLIP_ASYNC\n");
1360                 return -EINVAL;
1361         }
1362
1363         /* can't test and expect an event at the same time. */
1364         if ((arg->flags & DRM_MODE_ATOMIC_TEST_ONLY) &&
1365                         (arg->flags & DRM_MODE_PAGE_FLIP_EVENT)) {
1366                 drm_dbg_atomic(dev,
1367                                "commit failed: page-flip event requested with test-only commit\n");
1368                 return -EINVAL;
1369         }
1370
1371         state = drm_atomic_state_alloc(dev);
1372         if (!state)
1373                 return -ENOMEM;
1374
1375         drm_modeset_acquire_init(&ctx, DRM_MODESET_ACQUIRE_INTERRUPTIBLE);
1376         state->acquire_ctx = &ctx;
1377         state->allow_modeset = !!(arg->flags & DRM_MODE_ATOMIC_ALLOW_MODESET);
1378
1379 retry:
1380         copied_objs = 0;
1381         copied_props = 0;
1382         fence_state = NULL;
1383         num_fences = 0;
1384
1385         for (i = 0; i < arg->count_objs; i++) {
1386                 uint32_t obj_id, count_props;
1387                 struct drm_mode_object *obj;
1388
1389                 if (get_user(obj_id, objs_ptr + copied_objs)) {
1390                         ret = -EFAULT;
1391                         goto out;
1392                 }
1393
1394                 obj = drm_mode_object_find(dev, file_priv, obj_id, DRM_MODE_OBJECT_ANY);
1395                 if (!obj) {
1396                         ret = -ENOENT;
1397                         goto out;
1398                 }
1399
1400                 if (!obj->properties) {
1401                         drm_mode_object_put(obj);
1402                         ret = -ENOENT;
1403                         goto out;
1404                 }
1405
1406                 if (get_user(count_props, count_props_ptr + copied_objs)) {
1407                         drm_mode_object_put(obj);
1408                         ret = -EFAULT;
1409                         goto out;
1410                 }
1411
1412                 copied_objs++;
1413
1414                 for (j = 0; j < count_props; j++) {
1415                         uint32_t prop_id;
1416                         uint64_t prop_value;
1417                         struct drm_property *prop;
1418
1419                         if (get_user(prop_id, props_ptr + copied_props)) {
1420                                 drm_mode_object_put(obj);
1421                                 ret = -EFAULT;
1422                                 goto out;
1423                         }
1424
1425                         prop = drm_mode_obj_find_prop_id(obj, prop_id);
1426                         if (!prop) {
1427                                 drm_mode_object_put(obj);
1428                                 ret = -ENOENT;
1429                                 goto out;
1430                         }
1431
1432                         if (copy_from_user(&prop_value,
1433                                            prop_values_ptr + copied_props,
1434                                            sizeof(prop_value))) {
1435                                 drm_mode_object_put(obj);
1436                                 ret = -EFAULT;
1437                                 goto out;
1438                         }
1439
1440                         ret = drm_atomic_set_property(state, file_priv,
1441                                                       obj, prop, prop_value);
1442                         if (ret) {
1443                                 drm_mode_object_put(obj);
1444                                 goto out;
1445                         }
1446
1447                         copied_props++;
1448                 }
1449
1450                 drm_mode_object_put(obj);
1451         }
1452
1453         ret = prepare_signaling(dev, state, arg, file_priv, &fence_state,
1454                                 &num_fences);
1455         if (ret)
1456                 goto out;
1457
1458         if (arg->flags & DRM_MODE_ATOMIC_TEST_ONLY) {
1459                 ret = drm_atomic_check_only(state);
1460         } else if (arg->flags & DRM_MODE_ATOMIC_NONBLOCK) {
1461                 ret = drm_atomic_nonblocking_commit(state);
1462         } else {
1463                 if (drm_debug_enabled(DRM_UT_STATE))
1464                         drm_atomic_print_new_state(state, &p);
1465
1466                 ret = drm_atomic_commit(state);
1467         }
1468
1469 out:
1470         complete_signaling(dev, state, fence_state, num_fences, !ret);
1471
1472         if (ret == -EDEADLK) {
1473                 drm_atomic_state_clear(state);
1474                 ret = drm_modeset_backoff(&ctx);
1475                 if (!ret)
1476                         goto retry;
1477         }
1478
1479         drm_atomic_state_put(state);
1480
1481         drm_modeset_drop_locks(&ctx);
1482         drm_modeset_acquire_fini(&ctx);
1483
1484         return ret;
1485 }