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 drm_atomic_crtc_set_property(struct drm_crtc *crtc,
 366                 struct drm_crtc_state *state, struct drm_property *property,
 367                 uint64_t val)
 368 {
 369         struct drm_device *dev = crtc->dev;
 370         struct drm_mode_config *config = &dev->mode_config;
 371         bool replaced = false;
 372         int ret;
 373
 374         if (property == config->prop_active)
 375                 state->active = val;
 376         else if (property == config->prop_mode_id) {
 377                 struct drm_property_blob *mode =
 378                         drm_property_lookup_blob(dev, val);
 379                 ret = drm_atomic_set_mode_prop_for_crtc(state, mode);
 380                 drm_property_blob_put(mode);
 381                 return ret;
 382         } else if (property == config->prop_vrr_enabled) {
 383                 state->vrr_enabled = val;
 384         } else if (property == config->degamma_lut_property) {
 385                 ret = drm_property_replace_blob_from_id(dev,
 386                                         &state->degamma_lut,
 387                                         val,
 388                                         -1, sizeof(struct drm_color_lut),
 389                                         &replaced);
 390                 state->color_mgmt_changed |= replaced;
 391                 return ret;
 392         } else if (property == config->ctm_property) {
 393                 ret = drm_property_replace_blob_from_id(dev,
 394                                         &state->ctm,
 395                                         val,
 396                                         sizeof(struct drm_color_ctm), -1,
 397                                         &replaced);
 398                 state->color_mgmt_changed |= replaced;
 399                 return ret;
 400         } else if (property == config->gamma_lut_property) {
 401                 ret = drm_property_replace_blob_from_id(dev,
 402                                         &state->gamma_lut,
 403                                         val,
 404                                         -1, sizeof(struct drm_color_lut),
 405                                         &replaced);
 406                 state->color_mgmt_changed |= replaced;
 407                 return ret;
 408         } else if (property == config->prop_out_fence_ptr) {
 409                 s32 __user *fence_ptr = u64_to_user_ptr(val);
 410
 411                 if (!fence_ptr)
 412                         return 0;
 413
 414                 if (put_user(-1, fence_ptr))
 415                         return -EFAULT;
 416
 417                 set_out_fence_for_crtc(state->state, crtc, fence_ptr);
 418         } else if (property == crtc->scaling_filter_property) {
 419                 state->scaling_filter = val;
 420         } else if (crtc->funcs->atomic_set_property) {
 421                 return crtc->funcs->atomic_set_property(crtc, state, property, val);
 422         } else {
 423                 drm_dbg_atomic(crtc->dev,
 424                                "[CRTC:%d:%s] unknown property [PROP:%d:%s]\n",
 425                                crtc->base.id, crtc->name,
 426                                property->base.id, property->name);
 427                 return -EINVAL;
 428         }
 429
 430         return 0;
 431 }
 432
 433 static int
 434 drm_atomic_crtc_get_property(struct drm_crtc *crtc,
 435                 const struct drm_crtc_state *state,
 436                 struct drm_property *property, uint64_t *val)
 437 {
 438         struct drm_device *dev = crtc->dev;
 439         struct drm_mode_config *config = &dev->mode_config;
 440
 441         if (property == config->prop_active)
 442                 *val = drm_atomic_crtc_effectively_active(state);
 443         else if (property == config->prop_mode_id)
 444                 *val = (state->mode_blob) ? state->mode_blob->base.id : 0;
 445         else if (property == config->prop_vrr_enabled)
 446                 *val = state->vrr_enabled;
 447         else if (property == config->degamma_lut_property)
 448                 *val = (state->degamma_lut) ? state->degamma_lut->base.id : 0;
 449         else if (property == config->ctm_property)
 450                 *val = (state->ctm) ? state->ctm->base.id : 0;
 451         else if (property == config->gamma_lut_property)
 452                 *val = (state->gamma_lut) ? state->gamma_lut->base.id : 0;
 453         else if (property == config->prop_out_fence_ptr)
 454                 *val = 0;
 455         else if (property == crtc->scaling_filter_property)
 456                 *val = state->scaling_filter;
 457         else if (crtc->funcs->atomic_get_property)
 458                 return crtc->funcs->atomic_get_property(crtc, state, property, val);
 459         else {
 460                 drm_dbg_atomic(dev,
 461                                "[CRTC:%d:%s] unknown property [PROP:%d:%s]\n",
 462                                crtc->base.id, crtc->name,
 463                                property->base.id, property->name);
 464                 return -EINVAL;
 465         }
 466
 467         return 0;
 468 }
 469
 470 static int drm_atomic_plane_set_property(struct drm_plane *plane,
 471                 struct drm_plane_state *state, struct drm_file *file_priv,
 472                 struct drm_property *property, uint64_t val)
 473 {
 474         struct drm_device *dev = plane->dev;
 475         struct drm_mode_config *config = &dev->mode_config;
 476         bool replaced = false;
 477         int ret;
 478
 479         if (property == config->prop_fb_id) {
 480                 struct drm_framebuffer *fb;
 481
 482                 fb = drm_framebuffer_lookup(dev, file_priv, val);
 483                 drm_atomic_set_fb_for_plane(state, fb);
 484                 if (fb)
 485                         drm_framebuffer_put(fb);
 486         } else if (property == config->prop_in_fence_fd) {
 487                 if (state->fence)
 488                         return -EINVAL;
 489
 490                 if (U642I64(val) == -1)
 491                         return 0;
 492
 493                 state->fence = sync_file_get_fence(val);
 494                 if (!state->fence)
 495                         return -EINVAL;
 496
 497         } else if (property == config->prop_crtc_id) {
 498                 struct drm_crtc *crtc = drm_crtc_find(dev, file_priv, val);
 499
 500                 if (val && !crtc) {
 501                         drm_dbg_atomic(dev,
 502                                        "[PROP:%d:%s] cannot find CRTC with ID %llu\n",
 503                                        property->base.id, property->name, val);
 504                         return -EACCES;
 505                 }
 506                 return drm_atomic_set_crtc_for_plane(state, crtc);
 507         } else if (property == config->prop_crtc_x) {
 508                 state->crtc_x = U642I64(val);
 509         } else if (property == config->prop_crtc_y) {
 510                 state->crtc_y = U642I64(val);
 511         } else if (property == config->prop_crtc_w) {
 512                 state->crtc_w = val;
 513         } else if (property == config->prop_crtc_h) {
 514                 state->crtc_h = val;
 515         } else if (property == config->prop_src_x) {
 516                 state->src_x = val;
 517         } else if (property == config->prop_src_y) {
 518                 state->src_y = val;
 519         } else if (property == config->prop_src_w) {
 520                 state->src_w = val;
 521         } else if (property == config->prop_src_h) {
 522                 state->src_h = val;
 523         } else if (property == plane->alpha_property) {
 524                 state->alpha = val;
 525         } else if (property == plane->blend_mode_property) {
 526                 state->pixel_blend_mode = val;
 527         } else if (property == plane->rotation_property) {
 528                 if (!is_power_of_2(val & DRM_MODE_ROTATE_MASK)) {
 529                         drm_dbg_atomic(plane->dev,
 530                                        "[PLANE:%d:%s] bad rotation bitmask: 0x%llx\n",
 531                                        plane->base.id, plane->name, val);
 532                         return -EINVAL;
 533                 }
 534                 state->rotation = val;
 535         } else if (property == plane->zpos_property) {
 536                 state->zpos = val;
 537         } else if (property == plane->color_encoding_property) {
 538                 state->color_encoding = val;
 539         } else if (property == plane->color_range_property) {
 540                 state->color_range = val;
 541         } else if (property == config->prop_fb_damage_clips) {
 542                 ret = drm_property_replace_blob_from_id(dev,
 543                                         &state->fb_damage_clips,
 544                                         val,
 545                                         -1,
 546                                         sizeof(struct drm_rect),
 547                                         &replaced);
 548                 return ret;
 549         } else if (property == plane->scaling_filter_property) {
 550                 state->scaling_filter = val;
 551         } else if (plane->funcs->atomic_set_property) {
 552                 return plane->funcs->atomic_set_property(plane, state,
 553                                 property, val);
 554         } else if (property == plane->hotspot_x_property) {
 555                 if (plane->type != DRM_PLANE_TYPE_CURSOR) {
 556                         drm_dbg_atomic(plane->dev,
 557                                        "[PLANE:%d:%s] is not a cursor plane: 0x%llx\n",
 558                                        plane->base.id, plane->name, val);
 559                         return -EINVAL;
 560                 }
 561                 state->hotspot_x = val;
 562         } else if (property == plane->hotspot_y_property) {
 563                 if (plane->type != DRM_PLANE_TYPE_CURSOR) {
 564                         drm_dbg_atomic(plane->dev,
 565                                        "[PLANE:%d:%s] is not a cursor plane: 0x%llx\n",
 566                                        plane->base.id, plane->name, val);
 567                         return -EINVAL;
 568                 }
 569                 state->hotspot_y = val;
 570         } else {
 571                 drm_dbg_atomic(plane->dev,
 572                                "[PLANE:%d:%s] unknown property [PROP:%d:%s]\n",
 573                                plane->base.id, plane->name,
 574                                property->base.id, property->name);
 575                 return -EINVAL;
 576         }
 577
 578         return 0;
 579 }
 580
 581 static int
 582 drm_atomic_plane_get_property(struct drm_plane *plane,
 583                 const struct drm_plane_state *state,
 584                 struct drm_property *property, uint64_t *val)
 585 {
 586         struct drm_device *dev = plane->dev;
 587         struct drm_mode_config *config = &dev->mode_config;
 588
 589         if (property == config->prop_fb_id) {
 590                 *val = (state->fb) ? state->fb->base.id : 0;
 591         } else if (property == config->prop_in_fence_fd) {
 592                 *val = -1;
 593         } else if (property == config->prop_crtc_id) {
 594                 *val = (state->crtc) ? state->crtc->base.id : 0;
 595         } else if (property == config->prop_crtc_x) {
 596                 *val = I642U64(state->crtc_x);
 597         } else if (property == config->prop_crtc_y) {
 598                 *val = I642U64(state->crtc_y);
 599         } else if (property == config->prop_crtc_w) {
 600                 *val = state->crtc_w;
 601         } else if (property == config->prop_crtc_h) {
 602                 *val = state->crtc_h;
 603         } else if (property == config->prop_src_x) {
 604                 *val = state->src_x;
 605         } else if (property == config->prop_src_y) {
 606                 *val = state->src_y;
 607         } else if (property == config->prop_src_w) {
 608                 *val = state->src_w;
 609         } else if (property == config->prop_src_h) {
 610                 *val = state->src_h;
 611         } else if (property == plane->alpha_property) {
 612                 *val = state->alpha;
 613         } else if (property == plane->blend_mode_property) {
 614                 *val = state->pixel_blend_mode;
 615         } else if (property == plane->rotation_property) {
 616                 *val = state->rotation;
 617         } else if (property == plane->zpos_property) {
 618                 *val = state->zpos;
 619         } else if (property == plane->color_encoding_property) {
 620                 *val = state->color_encoding;
 621         } else if (property == plane->color_range_property) {
 622                 *val = state->color_range;
 623         } else if (property == config->prop_fb_damage_clips) {
 624                 *val = (state->fb_damage_clips) ?
 625                         state->fb_damage_clips->base.id : 0;
 626         } else if (property == plane->scaling_filter_property) {
 627                 *val = state->scaling_filter;
 628         } else if (plane->funcs->atomic_get_property) {
 629                 return plane->funcs->atomic_get_property(plane, state, property, val);
 630         } else if (property == plane->hotspot_x_property) {
 631                 *val = state->hotspot_x;
 632         } else if (property == plane->hotspot_y_property) {
 633                 *val = state->hotspot_y;
 634         } else {
 635                 drm_dbg_atomic(dev,
 636                                "[PLANE:%d:%s] unknown property [PROP:%d:%s]\n",
 637                                plane->base.id, plane->name,
 638                                property->base.id, property->name);
 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                         drm_dbg_atomic(dev,
 682                                        "[PROP:%d:%s] cannot find CRTC with ID %llu\n",
 683                                        property->base.id, property->name, val);
 684                         return -EACCES;
 685                 }
 686                 return drm_atomic_set_crtc_for_connector(state, crtc);
 687         } else if (property == config->dpms_property) {
 688                 /* setting DPMS property requires special handling, which
 689                  * is done in legacy setprop path for us.  Disallow (for
 690                  * now?) atomic writes to DPMS property:
 691                  */
 692                 drm_dbg_atomic(dev,
 693                                "legacy [PROP:%d:%s] can only be set via legacy uAPI\n",
 694                                property->base.id, property->name);
 695                 return -EINVAL;
 696         } else if (property == config->tv_select_subconnector_property) {
 697                 state->tv.select_subconnector = val;
 698         } else if (property == config->tv_subconnector_property) {
 699                 state->tv.subconnector = val;
 700         } else if (property == config->tv_left_margin_property) {
 701                 state->tv.margins.left = val;
 702         } else if (property == config->tv_right_margin_property) {
 703                 state->tv.margins.right = val;
 704         } else if (property == config->tv_top_margin_property) {
 705                 state->tv.margins.top = val;
 706         } else if (property == config->tv_bottom_margin_property) {
 707                 state->tv.margins.bottom = val;
 708         } else if (property == config->legacy_tv_mode_property) {
 709                 state->tv.legacy_mode = val;
 710         } else if (property == config->tv_mode_property) {
 711                 state->tv.mode = val;
 712         } else if (property == config->tv_brightness_property) {
 713                 state->tv.brightness = val;
 714         } else if (property == config->tv_contrast_property) {
 715                 state->tv.contrast = val;
 716         } else if (property == config->tv_flicker_reduction_property) {
 717                 state->tv.flicker_reduction = val;
 718         } else if (property == config->tv_overscan_property) {
 719                 state->tv.overscan = val;
 720         } else if (property == config->tv_saturation_property) {
 721                 state->tv.saturation = val;
 722         } else if (property == config->tv_hue_property) {
 723                 state->tv.hue = val;
 724         } else if (property == config->link_status_property) {
 725                 /* Never downgrade from GOOD to BAD on userspace's request here,
 726                  * only hw issues can do that.
 727                  *
 728                  * For an atomic property the userspace doesn't need to be able
 729                  * to understand all the properties, but needs to be able to
 730                  * restore the state it wants on VT switch. So if the userspace
 731                  * tries to change the link_status from GOOD to BAD, driver
 732                  * silently rejects it and returns a 0. This prevents userspace
 733                  * from accidentally breaking  the display when it restores the
 734                  * state.
 735                  */
 736                 if (state->link_status != DRM_LINK_STATUS_GOOD)
 737                         state->link_status = val;
 738         } else if (property == config->hdr_output_metadata_property) {
 739                 ret = drm_property_replace_blob_from_id(dev,
 740                                 &state->hdr_output_metadata,
 741                                 val,
 742                                 sizeof(struct hdr_output_metadata), -1,
 743                                 &replaced);
 744                 return ret;
 745         } else if (property == config->aspect_ratio_property) {
 746                 state->picture_aspect_ratio = val;
 747         } else if (property == config->content_type_property) {
 748                 state->content_type = val;
 749         } else if (property == connector->scaling_mode_property) {
 750                 state->scaling_mode = val;
 751         } else if (property == config->content_protection_property) {
 752                 if (val == DRM_MODE_CONTENT_PROTECTION_ENABLED) {
 753                         drm_dbg_kms(dev, "only drivers can set CP Enabled\n");
 754                         return -EINVAL;
 755                 }
 756                 state->content_protection = val;
 757         } else if (property == config->hdcp_content_type_property) {
 758                 state->hdcp_content_type = val;
 759         } else if (property == connector->colorspace_property) {
 760                 state->colorspace = val;
 761         } else if (property == config->writeback_fb_id_property) {
 762                 struct drm_framebuffer *fb;
 763                 int ret;
 764
 765                 fb = drm_framebuffer_lookup(dev, file_priv, val);
 766                 ret = drm_atomic_set_writeback_fb_for_connector(state, fb);
 767                 if (fb)
 768                         drm_framebuffer_put(fb);
 769                 return ret;
 770         } else if (property == config->writeback_out_fence_ptr_property) {
 771                 s32 __user *fence_ptr = u64_to_user_ptr(val);
 772
 773                 return set_out_fence_for_connector(state->state, connector,
 774                                                    fence_ptr);
 775         } else if (property == connector->max_bpc_property) {
 776                 state->max_requested_bpc = val;
 777         } else if (property == connector->privacy_screen_sw_state_property) {
 778                 state->privacy_screen_sw_state = val;
 779         } else if (connector->funcs->atomic_set_property) {
 780                 return connector->funcs->atomic_set_property(connector,
 781                                 state, property, val);
 782         } else {
 783                 drm_dbg_atomic(connector->dev,
 784                                "[CONNECTOR:%d:%s] unknown property [PROP:%d:%s]\n",
 785                                connector->base.id, connector->name,
 786                                property->base.id, property->name);
 787                 return -EINVAL;
 788         }
 789
 790         return 0;
 791 }
 792
 793 static int
 794 drm_atomic_connector_get_property(struct drm_connector *connector,
 795                 const struct drm_connector_state *state,
 796                 struct drm_property *property, uint64_t *val)
 797 {
 798         struct drm_device *dev = connector->dev;
 799         struct drm_mode_config *config = &dev->mode_config;
 800
 801         if (property == config->prop_crtc_id) {
 802                 *val = (state->crtc) ? state->crtc->base.id : 0;
 803         } else if (property == config->dpms_property) {
 804                 if (state->crtc && state->crtc->state->self_refresh_active)
 805                         *val = DRM_MODE_DPMS_ON;
 806                 else
 807                         *val = connector->dpms;
 808         } else if (property == config->tv_select_subconnector_property) {
 809                 *val = state->tv.select_subconnector;
 810         } else if (property == config->tv_subconnector_property) {
 811                 *val = state->tv.subconnector;
 812         } else if (property == config->tv_left_margin_property) {
 813                 *val = state->tv.margins.left;
 814         } else if (property == config->tv_right_margin_property) {
 815                 *val = state->tv.margins.right;
 816         } else if (property == config->tv_top_margin_property) {
 817                 *val = state->tv.margins.top;
 818         } else if (property == config->tv_bottom_margin_property) {
 819                 *val = state->tv.margins.bottom;
 820         } else if (property == config->legacy_tv_mode_property) {
 821                 *val = state->tv.legacy_mode;
 822         } else if (property == config->tv_mode_property) {
 823                 *val = state->tv.mode;
 824         } else if (property == config->tv_brightness_property) {
 825                 *val = state->tv.brightness;
 826         } else if (property == config->tv_contrast_property) {
 827                 *val = state->tv.contrast;
 828         } else if (property == config->tv_flicker_reduction_property) {
 829                 *val = state->tv.flicker_reduction;
 830         } else if (property == config->tv_overscan_property) {
 831                 *val = state->tv.overscan;
 832         } else if (property == config->tv_saturation_property) {
 833                 *val = state->tv.saturation;
 834         } else if (property == config->tv_hue_property) {
 835                 *val = state->tv.hue;
 836         } else if (property == config->link_status_property) {
 837                 *val = state->link_status;
 838         } else if (property == config->aspect_ratio_property) {
 839                 *val = state->picture_aspect_ratio;
 840         } else if (property == config->content_type_property) {
 841                 *val = state->content_type;
 842         } else if (property == connector->colorspace_property) {
 843                 *val = state->colorspace;
 844         } else if (property == connector->scaling_mode_property) {
 845                 *val = state->scaling_mode;
 846         } else if (property == config->hdr_output_metadata_property) {
 847                 *val = state->hdr_output_metadata ?
 848                         state->hdr_output_metadata->base.id : 0;
 849         } else if (property == config->content_protection_property) {
 850                 *val = state->content_protection;
 851         } else if (property == config->hdcp_content_type_property) {
 852                 *val = state->hdcp_content_type;
 853         } else if (property == config->writeback_fb_id_property) {
 854                 /* Writeback framebuffer is one-shot, write and forget */
 855                 *val = 0;
 856         } else if (property == config->writeback_out_fence_ptr_property) {
 857                 *val = 0;
 858         } else if (property == connector->max_bpc_property) {
 859                 *val = state->max_requested_bpc;
 860         } else if (property == connector->privacy_screen_sw_state_property) {
 861                 *val = state->privacy_screen_sw_state;
 862         } else if (connector->funcs->atomic_get_property) {
 863                 return connector->funcs->atomic_get_property(connector,
 864                                 state, property, val);
 865         } else {
 866                 drm_dbg_atomic(dev,
 867                                "[CONNECTOR:%d:%s] unknown property [PROP:%d:%s]\n",
 868                                connector->base.id, connector->name,
 869                                property->base.id, property->name);
 870                 return -EINVAL;
 871         }
 872
 873         return 0;
 874 }
 875
 876 int drm_atomic_get_property(struct drm_mode_object *obj,
 877                 struct drm_property *property, uint64_t *val)
 878 {
 879         struct drm_device *dev = property->dev;
 880         int ret;
 881
 882         switch (obj->type) {
 883         case DRM_MODE_OBJECT_CONNECTOR: {
 884                 struct drm_connector *connector = obj_to_connector(obj);
 885
 886                 WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
 887                 ret = drm_atomic_connector_get_property(connector,
 888                                 connector->state, property, val);
 889                 break;
 890         }
 891         case DRM_MODE_OBJECT_CRTC: {
 892                 struct drm_crtc *crtc = obj_to_crtc(obj);
 893
 894                 WARN_ON(!drm_modeset_is_locked(&crtc->mutex));
 895                 ret = drm_atomic_crtc_get_property(crtc,
 896                                 crtc->state, property, val);
 897                 break;
 898         }
 899         case DRM_MODE_OBJECT_PLANE: {
 900                 struct drm_plane *plane = obj_to_plane(obj);
 901
 902                 WARN_ON(!drm_modeset_is_locked(&plane->mutex));
 903                 ret = drm_atomic_plane_get_property(plane,
 904                                 plane->state, property, val);
 905                 break;
 906         }
 907         default:
 908                 drm_dbg_atomic(dev, "[OBJECT:%d] has no properties\n", obj->id);
 909                 ret = -EINVAL;
 910                 break;
 911         }
 912
 913         return ret;
 914 }
 915
 916 /*
 917  * The big monster ioctl
 918  */
 919
 920 static struct drm_pending_vblank_event *create_vblank_event(
 921                 struct drm_crtc *crtc, uint64_t user_data)
 922 {
 923         struct drm_pending_vblank_event *e = NULL;
 924
 925         e = kzalloc(sizeof *e, GFP_KERNEL);
 926         if (!e)
 927                 return NULL;
 928
 929         e->event.base.type = DRM_EVENT_FLIP_COMPLETE;
 930         e->event.base.length = sizeof(e->event);
 931         e->event.vbl.crtc_id = crtc->base.id;
 932         e->event.vbl.user_data = user_data;
 933
 934         return e;
 935 }
 936
 937 int drm_atomic_connector_commit_dpms(struct drm_atomic_state *state,
 938                                      struct drm_connector *connector,
 939                                      int mode)
 940 {
 941         struct drm_connector *tmp_connector;
 942         struct drm_connector_state *new_conn_state;
 943         struct drm_crtc *crtc;
 944         struct drm_crtc_state *crtc_state;
 945         int i, ret, old_mode = connector->dpms;
 946         bool active = false;
 947
 948         ret = drm_modeset_lock(&state->dev->mode_config.connection_mutex,
 949                                state->acquire_ctx);
 950         if (ret)
 951                 return ret;
 952
 953         if (mode != DRM_MODE_DPMS_ON)
 954                 mode = DRM_MODE_DPMS_OFF;
 955         connector->dpms = mode;
 956
 957         crtc = connector->state->crtc;
 958         if (!crtc)
 959                 goto out;
 960         ret = drm_atomic_add_affected_connectors(state, crtc);
 961         if (ret)
 962                 goto out;
 963
 964         crtc_state = drm_atomic_get_crtc_state(state, crtc);
 965         if (IS_ERR(crtc_state)) {
 966                 ret = PTR_ERR(crtc_state);
 967                 goto out;
 968         }
 969
 970         for_each_new_connector_in_state(state, tmp_connector, new_conn_state, i) {
 971                 if (new_conn_state->crtc != crtc)
 972                         continue;
 973                 if (tmp_connector->dpms == DRM_MODE_DPMS_ON) {
 974                         active = true;
 975                         break;
 976                 }
 977         }
 978
 979         crtc_state->active = active;
 980         ret = drm_atomic_commit(state);
 981 out:
 982         if (ret != 0)
 983                 connector->dpms = old_mode;
 984         return ret;
 985 }
 986
 987 static int drm_atomic_check_prop_changes(int ret, uint64_t old_val, uint64_t prop_value,
 988                                          struct drm_property *prop)
 989 {
 990         if (ret != 0 || old_val != prop_value) {
 991                 drm_dbg_atomic(prop->dev,
 992                                "[PROP:%d:%s] No prop can be changed during async flip\n",
 993                                prop->base.id, prop->name);
 994                 return -EINVAL;
 995         }
 996
 997         return 0;
 998 }
 999
1000 int drm_atomic_set_property(struct drm_atomic_state *state,
1001                             struct drm_file *file_priv,
1002                             struct drm_mode_object *obj,
1003                             struct drm_property *prop,
1004                             u64 prop_value,
1005                             bool async_flip)
1006 {
1007         struct drm_mode_object *ref;
1008         u64 old_val;
1009         int ret;
1010
1011         if (!drm_property_change_valid_get(prop, prop_value, &ref))
1012                 return -EINVAL;
1013
1014         switch (obj->type) {
1015         case DRM_MODE_OBJECT_CONNECTOR: {
1016                 struct drm_connector *connector = obj_to_connector(obj);
1017                 struct drm_connector_state *connector_state;
1018
1019                 connector_state = drm_atomic_get_connector_state(state, connector);
1020                 if (IS_ERR(connector_state)) {
1021                         ret = PTR_ERR(connector_state);
1022                         break;
1023                 }
1024
1025                 if (async_flip) {
1026                         ret = drm_atomic_connector_get_property(connector, connector_state,
1027                                                                 prop, &old_val);
1028                         ret = drm_atomic_check_prop_changes(ret, old_val, prop_value, prop);
1029                         break;
1030                 }
1031
1032                 ret = drm_atomic_connector_set_property(connector,
1033                                 connector_state, file_priv,
1034                                 prop, prop_value);
1035                 break;
1036         }
1037         case DRM_MODE_OBJECT_CRTC: {
1038                 struct drm_crtc *crtc = obj_to_crtc(obj);
1039                 struct drm_crtc_state *crtc_state;
1040
1041                 crtc_state = drm_atomic_get_crtc_state(state, crtc);
1042                 if (IS_ERR(crtc_state)) {
1043                         ret = PTR_ERR(crtc_state);
1044                         break;
1045                 }
1046
1047                 if (async_flip) {
1048                         ret = drm_atomic_crtc_get_property(crtc, crtc_state,
1049                                                            prop, &old_val);
1050                         ret = drm_atomic_check_prop_changes(ret, old_val, prop_value, prop);
1051                         break;
1052                 }
1053
1054                 ret = drm_atomic_crtc_set_property(crtc,
1055                                 crtc_state, prop, prop_value);
1056                 break;
1057         }
1058         case DRM_MODE_OBJECT_PLANE: {
1059                 struct drm_plane *plane = obj_to_plane(obj);
1060                 struct drm_plane_state *plane_state;
1061                 struct drm_mode_config *config = &plane->dev->mode_config;
1062
1063                 plane_state = drm_atomic_get_plane_state(state, plane);
1064                 if (IS_ERR(plane_state)) {
1065                         ret = PTR_ERR(plane_state);
1066                         break;
1067                 }
1068
1069                 if (async_flip && prop != config->prop_fb_id) {
1070                         ret = drm_atomic_plane_get_property(plane, plane_state,
1071                                                             prop, &old_val);
1072                         ret = drm_atomic_check_prop_changes(ret, old_val, prop_value, prop);
1073                         break;
1074                 }
1075
1076                 if (async_flip && plane_state->plane->type != DRM_PLANE_TYPE_PRIMARY) {
1077                         drm_dbg_atomic(prop->dev,
1078                                        "[OBJECT:%d] Only primary planes can be changed during async flip\n",
1079                                        obj->id);
1080                         ret = -EINVAL;
1081                         break;
1082                 }
1083
1084                 ret = drm_atomic_plane_set_property(plane,
1085                                 plane_state, file_priv,
1086                                 prop, prop_value);
1087                 break;
1088         }
1089         default:
1090                 drm_dbg_atomic(prop->dev, "[OBJECT:%d] has no properties\n", obj->id);
1091                 ret = -EINVAL;
1092                 break;
1093         }
1094
1095         drm_property_change_valid_put(prop, ref);
1096         return ret;
1097 }
1098
1099 /**
1100  * DOC: explicit fencing properties
1101  *
1102  * Explicit fencing allows userspace to control the buffer synchronization
1103  * between devices. A Fence or a group of fences are transferred to/from
1104  * userspace using Sync File fds and there are two DRM properties for that.
1105  * IN_FENCE_FD on each DRM Plane to send fences to the kernel and
1106  * OUT_FENCE_PTR on each DRM CRTC to receive fences from the kernel.
1107  *
1108  * As a contrast, with implicit fencing the kernel keeps track of any
1109  * ongoing rendering, and automatically ensures that the atomic update waits
1110  * for any pending rendering to complete. This is usually tracked in &struct
1111  * dma_resv which can also contain mandatory kernel fences. Implicit syncing
1112  * is how Linux traditionally worked (e.g. DRI2/3 on X.org), whereas explicit
1113  * fencing is what Android wants.
1114  *
1115  * "IN_FENCE_FD”:
1116  *      Use this property to pass a fence that DRM should wait on before
1117  *      proceeding with the Atomic Commit request and show the framebuffer for
1118  *      the plane on the screen. The fence can be either a normal fence or a
1119  *      merged one, the sync_file framework will handle both cases and use a
1120  *      fence_array if a merged fence is received. Passing -1 here means no
1121  *      fences to wait on.
1122  *
1123  *      If the Atomic Commit request has the DRM_MODE_ATOMIC_TEST_ONLY flag
1124  *      it will only check if the Sync File is a valid one.
1125  *
1126  *      On the driver side the fence is stored on the @fence parameter of
1127  *      &struct drm_plane_state. Drivers which also support implicit fencing
1128  *      should extract the implicit fence using drm_gem_plane_helper_prepare_fb(),
1129  *      to make sure there's consistent behaviour between drivers in precedence
1130  *      of implicit vs. explicit fencing.
1131  *
1132  * "OUT_FENCE_PTR”:
1133  *      Use this property to pass a file descriptor pointer to DRM. Once the
1134  *      Atomic Commit request call returns OUT_FENCE_PTR will be filled with
1135  *      the file descriptor number of a Sync File. This Sync File contains the
1136  *      CRTC fence that will be signaled when all framebuffers present on the
1137  *      Atomic Commit * request for that given CRTC are scanned out on the
1138  *      screen.
1139  *
1140  *      The Atomic Commit request fails if a invalid pointer is passed. If the
1141  *      Atomic Commit request fails for any other reason the out fence fd
1142  *      returned will be -1. On a Atomic Commit with the
1143  *      DRM_MODE_ATOMIC_TEST_ONLY flag the out fence will also be set to -1.
1144  *
1145  *      Note that out-fences don't have a special interface to drivers and are
1146  *      internally represented by a &struct drm_pending_vblank_event in struct
1147  *      &drm_crtc_state, which is also used by the nonblocking atomic commit
1148  *      helpers and for the DRM event handling for existing userspace.
1149  */
1150
1151 struct drm_out_fence_state {
1152         s32 __user *out_fence_ptr;
1153         struct sync_file *sync_file;
1154         int fd;
1155 };
1156
1157 static int setup_out_fence(struct drm_out_fence_state *fence_state,
1158                            struct dma_fence *fence)
1159 {
1160         fence_state->fd = get_unused_fd_flags(O_CLOEXEC);
1161         if (fence_state->fd < 0)
1162                 return fence_state->fd;
1163
1164         if (put_user(fence_state->fd, fence_state->out_fence_ptr))
1165                 return -EFAULT;
1166
1167         fence_state->sync_file = sync_file_create(fence);
1168         if (!fence_state->sync_file)
1169                 return -ENOMEM;
1170
1171         return 0;
1172 }
1173
1174 static int prepare_signaling(struct drm_device *dev,
1175                                   struct drm_atomic_state *state,
1176                                   struct drm_mode_atomic *arg,
1177                                   struct drm_file *file_priv,
1178                                   struct drm_out_fence_state **fence_state,
1179                                   unsigned int *num_fences)
1180 {
1181         struct drm_crtc *crtc;
1182         struct drm_crtc_state *crtc_state;
1183         struct drm_connector *conn;
1184         struct drm_connector_state *conn_state;
1185         int i, c = 0, ret;
1186
1187         if (arg->flags & DRM_MODE_ATOMIC_TEST_ONLY)
1188                 return 0;
1189
1190         for_each_new_crtc_in_state(state, crtc, crtc_state, i) {
1191                 s32 __user *fence_ptr;
1192
1193                 fence_ptr = get_out_fence_for_crtc(crtc_state->state, crtc);
1194
1195                 if (arg->flags & DRM_MODE_PAGE_FLIP_EVENT || fence_ptr) {
1196                         struct drm_pending_vblank_event *e;
1197
1198                         e = create_vblank_event(crtc, arg->user_data);
1199                         if (!e)
1200                                 return -ENOMEM;
1201
1202                         crtc_state->event = e;
1203                 }
1204
1205                 if (arg->flags & DRM_MODE_PAGE_FLIP_EVENT) {
1206                         struct drm_pending_vblank_event *e = crtc_state->event;
1207
1208                         if (!file_priv)
1209                                 continue;
1210
1211                         ret = drm_event_reserve_init(dev, file_priv, &e->base,
1212                                                      &e->event.base);
1213                         if (ret) {
1214                                 kfree(e);
1215                                 crtc_state->event = NULL;
1216                                 return ret;
1217                         }
1218                 }
1219
1220                 if (fence_ptr) {
1221                         struct dma_fence *fence;
1222                         struct drm_out_fence_state *f;
1223
1224                         f = krealloc(*fence_state, sizeof(**fence_state) *
1225                                      (*num_fences + 1), GFP_KERNEL);
1226                         if (!f)
1227                                 return -ENOMEM;
1228
1229                         memset(&f[*num_fences], 0, sizeof(*f));
1230
1231                         f[*num_fences].out_fence_ptr = fence_ptr;
1232                         *fence_state = f;
1233
1234                         fence = drm_crtc_create_fence(crtc);
1235                         if (!fence)
1236                                 return -ENOMEM;
1237
1238                         ret = setup_out_fence(&f[(*num_fences)++], fence);
1239                         if (ret) {
1240                                 dma_fence_put(fence);
1241                                 return ret;
1242                         }
1243
1244                         crtc_state->event->base.fence = fence;
1245                 }
1246
1247                 c++;
1248         }
1249
1250         for_each_new_connector_in_state(state, conn, conn_state, i) {
1251                 struct drm_writeback_connector *wb_conn;
1252                 struct drm_out_fence_state *f;
1253                 struct dma_fence *fence;
1254                 s32 __user *fence_ptr;
1255
1256                 if (!conn_state->writeback_job)
1257                         continue;
1258
1259                 fence_ptr = get_out_fence_for_connector(state, conn);
1260                 if (!fence_ptr)
1261                         continue;
1262
1263                 f = krealloc(*fence_state, sizeof(**fence_state) *
1264                              (*num_fences + 1), GFP_KERNEL);
1265                 if (!f)
1266                         return -ENOMEM;
1267
1268                 memset(&f[*num_fences], 0, sizeof(*f));
1269
1270                 f[*num_fences].out_fence_ptr = fence_ptr;
1271                 *fence_state = f;
1272
1273                 wb_conn = drm_connector_to_writeback(conn);
1274                 fence = drm_writeback_get_out_fence(wb_conn);
1275                 if (!fence)
1276                         return -ENOMEM;
1277
1278                 ret = setup_out_fence(&f[(*num_fences)++], fence);
1279                 if (ret) {
1280                         dma_fence_put(fence);
1281                         return ret;
1282                 }
1283
1284                 conn_state->writeback_job->out_fence = fence;
1285         }
1286
1287         /*
1288          * Having this flag means user mode pends on event which will never
1289          * reach due to lack of at least one CRTC for signaling
1290          */
1291         if (c == 0 && (arg->flags & DRM_MODE_PAGE_FLIP_EVENT)) {
1292                 drm_dbg_atomic(dev, "need at least one CRTC for DRM_MODE_PAGE_FLIP_EVENT");
1293                 return -EINVAL;
1294         }
1295
1296         return 0;
1297 }
1298
1299 static void complete_signaling(struct drm_device *dev,
1300                                struct drm_atomic_state *state,
1301                                struct drm_out_fence_state *fence_state,
1302                                unsigned int num_fences,
1303                                bool install_fds)
1304 {
1305         struct drm_crtc *crtc;
1306         struct drm_crtc_state *crtc_state;
1307         int i;
1308
1309         if (install_fds) {
1310                 for (i = 0; i < num_fences; i++)
1311                         fd_install(fence_state[i].fd,
1312                                    fence_state[i].sync_file->file);
1313
1314                 kfree(fence_state);
1315                 return;
1316         }
1317
1318         for_each_new_crtc_in_state(state, crtc, crtc_state, i) {
1319                 struct drm_pending_vblank_event *event = crtc_state->event;
1320                 /*
1321                  * Free the allocated event. drm_atomic_helper_setup_commit
1322                  * can allocate an event too, so only free it if it's ours
1323                  * to prevent a double free in drm_atomic_state_clear.
1324                  */
1325                 if (event && (event->base.fence || event->base.file_priv)) {
1326                         drm_event_cancel_free(dev, &event->base);
1327                         crtc_state->event = NULL;
1328                 }
1329         }
1330
1331         if (!fence_state)
1332                 return;
1333
1334         for (i = 0; i < num_fences; i++) {
1335                 if (fence_state[i].sync_file)
1336                         fput(fence_state[i].sync_file->file);
1337                 if (fence_state[i].fd >= 0)
1338                         put_unused_fd(fence_state[i].fd);
1339
1340                 /* If this fails log error to the user */
1341                 if (fence_state[i].out_fence_ptr &&
1342                     put_user(-1, fence_state[i].out_fence_ptr))
1343                         drm_dbg_atomic(dev, "Couldn't clear out_fence_ptr\n");
1344         }
1345
1346         kfree(fence_state);
1347 }
1348
1349 static void
1350 set_async_flip(struct drm_atomic_state *state)
1351 {
1352         struct drm_crtc *crtc;
1353         struct drm_crtc_state *crtc_state;
1354         int i;
1355
1356         for_each_new_crtc_in_state(state, crtc, crtc_state, i) {
1357                 crtc_state->async_flip = true;
1358         }
1359 }
1360
1361 int drm_mode_atomic_ioctl(struct drm_device *dev,
1362                           void *data, struct drm_file *file_priv)
1363 {
1364         struct drm_mode_atomic *arg = data;
1365         uint32_t __user *objs_ptr = (uint32_t __user *)(unsigned long)(arg->objs_ptr);
1366         uint32_t __user *count_props_ptr = (uint32_t __user *)(unsigned long)(arg->count_props_ptr);
1367         uint32_t __user *props_ptr = (uint32_t __user *)(unsigned long)(arg->props_ptr);
1368         uint64_t __user *prop_values_ptr = (uint64_t __user *)(unsigned long)(arg->prop_values_ptr);
1369         unsigned int copied_objs, copied_props;
1370         struct drm_atomic_state *state;
1371         struct drm_modeset_acquire_ctx ctx;
1372         struct drm_out_fence_state *fence_state;
1373         int ret = 0;
1374         unsigned int i, j, num_fences;
1375         bool async_flip = false;
1376
1377         /* disallow for drivers not supporting atomic: */
1378         if (!drm_core_check_feature(dev, DRIVER_ATOMIC))
1379                 return -EOPNOTSUPP;
1380
1381         /* disallow for userspace that has not enabled atomic cap (even
1382          * though this may be a bit overkill, since legacy userspace
1383          * wouldn't know how to call this ioctl)
1384          */
1385         if (!file_priv->atomic) {
1386                 drm_dbg_atomic(dev,
1387                                "commit failed: atomic cap not enabled\n");
1388                 return -EINVAL;
1389         }
1390
1391         if (arg->flags & ~DRM_MODE_ATOMIC_FLAGS) {
1392                 drm_dbg_atomic(dev, "commit failed: invalid flag\n");
1393                 return -EINVAL;
1394         }
1395
1396         if (arg->reserved) {
1397                 drm_dbg_atomic(dev, "commit failed: reserved field set\n");
1398                 return -EINVAL;
1399         }
1400
1401         if (arg->flags & DRM_MODE_PAGE_FLIP_ASYNC) {
1402                 if (!dev->mode_config.async_page_flip) {
1403                         drm_dbg_atomic(dev,
1404                                        "commit failed: DRM_MODE_PAGE_FLIP_ASYNC not supported\n");
1405                         return -EINVAL;
1406                 }
1407
1408                 async_flip = true;
1409         }
1410
1411         /* can't test and expect an event at the same time. */
1412         if ((arg->flags & DRM_MODE_ATOMIC_TEST_ONLY) &&
1413                         (arg->flags & DRM_MODE_PAGE_FLIP_EVENT)) {
1414                 drm_dbg_atomic(dev,
1415                                "commit failed: page-flip event requested with test-only commit\n");
1416                 return -EINVAL;
1417         }
1418
1419         state = drm_atomic_state_alloc(dev);
1420         if (!state)
1421                 return -ENOMEM;
1422
1423         drm_modeset_acquire_init(&ctx, DRM_MODESET_ACQUIRE_INTERRUPTIBLE);
1424         state->acquire_ctx = &ctx;
1425         state->allow_modeset = !!(arg->flags & DRM_MODE_ATOMIC_ALLOW_MODESET);
1426
1427 retry:
1428         copied_objs = 0;
1429         copied_props = 0;
1430         fence_state = NULL;
1431         num_fences = 0;
1432
1433         for (i = 0; i < arg->count_objs; i++) {
1434                 uint32_t obj_id, count_props;
1435                 struct drm_mode_object *obj;
1436
1437                 if (get_user(obj_id, objs_ptr + copied_objs)) {
1438                         ret = -EFAULT;
1439                         goto out;
1440                 }
1441
1442                 obj = drm_mode_object_find(dev, file_priv, obj_id, DRM_MODE_OBJECT_ANY);
1443                 if (!obj) {
1444                         drm_dbg_atomic(dev, "cannot find object ID %d", obj_id);
1445                         ret = -ENOENT;
1446                         goto out;
1447                 }
1448
1449                 if (!obj->properties) {
1450                         drm_dbg_atomic(dev, "[OBJECT:%d] has no properties", obj_id);
1451                         drm_mode_object_put(obj);
1452                         ret = -ENOENT;
1453                         goto out;
1454                 }
1455
1456                 if (get_user(count_props, count_props_ptr + copied_objs)) {
1457                         drm_mode_object_put(obj);
1458                         ret = -EFAULT;
1459                         goto out;
1460                 }
1461
1462                 copied_objs++;
1463
1464                 for (j = 0; j < count_props; j++) {
1465                         uint32_t prop_id;
1466                         uint64_t prop_value;
1467                         struct drm_property *prop;
1468
1469                         if (get_user(prop_id, props_ptr + copied_props)) {
1470                                 drm_mode_object_put(obj);
1471                                 ret = -EFAULT;
1472                                 goto out;
1473                         }
1474
1475                         prop = drm_mode_obj_find_prop_id(obj, prop_id);
1476                         if (!prop) {
1477                                 drm_dbg_atomic(dev,
1478                                                "[OBJECT:%d] cannot find property ID %d",
1479                                                obj_id, prop_id);
1480                                 drm_mode_object_put(obj);
1481                                 ret = -ENOENT;
1482                                 goto out;
1483                         }
1484
1485                         if (copy_from_user(&prop_value,
1486                                            prop_values_ptr + copied_props,
1487                                            sizeof(prop_value))) {
1488                                 drm_mode_object_put(obj);
1489                                 ret = -EFAULT;
1490                                 goto out;
1491                         }
1492
1493                         ret = drm_atomic_set_property(state, file_priv, obj,
1494                                                       prop, prop_value, async_flip);
1495                         if (ret) {
1496                                 drm_mode_object_put(obj);
1497                                 goto out;
1498                         }
1499
1500                         copied_props++;
1501                 }
1502
1503                 drm_mode_object_put(obj);
1504         }
1505
1506         ret = prepare_signaling(dev, state, arg, file_priv, &fence_state,
1507                                 &num_fences);
1508         if (ret)
1509                 goto out;
1510
1511         if (arg->flags & DRM_MODE_PAGE_FLIP_ASYNC)
1512                 set_async_flip(state);
1513
1514         if (arg->flags & DRM_MODE_ATOMIC_TEST_ONLY) {
1515                 ret = drm_atomic_check_only(state);
1516         } else if (arg->flags & DRM_MODE_ATOMIC_NONBLOCK) {
1517                 ret = drm_atomic_nonblocking_commit(state);
1518         } else {
1519                 ret = drm_atomic_commit(state);
1520         }
1521
1522 out:
1523         complete_signaling(dev, state, fence_state, num_fences, !ret);
1524
1525         if (ret == -EDEADLK) {
1526                 drm_atomic_state_clear(state);
1527                 ret = drm_modeset_backoff(&ctx);
1528                 if (!ret)
1529                         goto retry;
1530         }
1531
1532         drm_atomic_state_put(state);
1533
1534         drm_modeset_drop_locks(&ctx);
1535         drm_modeset_acquire_fini(&ctx);
1536
1537         return ret;
1538 }