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