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                         drm_dbg_atomic(dev,
 379                                        "cannot find blob ID %llu\n", blob_id);
 380                         return -EINVAL;
 381                 }
 382
 383                 if (expected_size > 0 &&
 384                     new_blob->length != expected_size) {
 385                         drm_dbg_atomic(dev,
 386                                        "[BLOB:%d] length %zu different from expected %zu\n",
 387                                        new_blob->base.id, new_blob->length, expected_size);
 388                         drm_property_blob_put(new_blob);
 389                         return -EINVAL;
 390                 }
 391                 if (expected_elem_size > 0 &&
 392                     new_blob->length % expected_elem_size != 0) {
 393                         drm_dbg_atomic(dev,
 394                                        "[BLOB:%d] length %zu not divisible by element size %zu\n",
 395                                        new_blob->base.id, new_blob->length, expected_elem_size);
 396                         drm_property_blob_put(new_blob);
 397                         return -EINVAL;
 398                 }
 399         }
 400
 401         *replaced |= drm_property_replace_blob(blob, new_blob);
 402         drm_property_blob_put(new_blob);
 403
 404         return 0;
 405 }
 406
 407 static int drm_atomic_crtc_set_property(struct drm_crtc *crtc,
 408                 struct drm_crtc_state *state, struct drm_property *property,
 409                 uint64_t val)
 410 {
 411         struct drm_device *dev = crtc->dev;
 412         struct drm_mode_config *config = &dev->mode_config;
 413         bool replaced = false;
 414         int ret;
 415
 416         if (property == config->prop_active)
 417                 state->active = val;
 418         else if (property == config->prop_mode_id) {
 419                 struct drm_property_blob *mode =
 420                         drm_property_lookup_blob(dev, val);
 421                 ret = drm_atomic_set_mode_prop_for_crtc(state, mode);
 422                 drm_property_blob_put(mode);
 423                 return ret;
 424         } else if (property == config->prop_vrr_enabled) {
 425                 state->vrr_enabled = val;
 426         } else if (property == config->degamma_lut_property) {
 427                 ret = drm_atomic_replace_property_blob_from_id(dev,
 428                                         &state->degamma_lut,
 429                                         val,
 430                                         -1, sizeof(struct drm_color_lut),
 431                                         &replaced);
 432                 state->color_mgmt_changed |= replaced;
 433                 return ret;
 434         } else if (property == config->ctm_property) {
 435                 ret = drm_atomic_replace_property_blob_from_id(dev,
 436                                         &state->ctm,
 437                                         val,
 438                                         sizeof(struct drm_color_ctm), -1,
 439                                         &replaced);
 440                 state->color_mgmt_changed |= replaced;
 441                 return ret;
 442         } else if (property == config->gamma_lut_property) {
 443                 ret = drm_atomic_replace_property_blob_from_id(dev,
 444                                         &state->gamma_lut,
 445                                         val,
 446                                         -1, sizeof(struct drm_color_lut),
 447                                         &replaced);
 448                 state->color_mgmt_changed |= replaced;
 449                 return ret;
 450         } else if (property == config->prop_out_fence_ptr) {
 451                 s32 __user *fence_ptr = u64_to_user_ptr(val);
 452
 453                 if (!fence_ptr)
 454                         return 0;
 455
 456                 if (put_user(-1, fence_ptr))
 457                         return -EFAULT;
 458
 459                 set_out_fence_for_crtc(state->state, crtc, fence_ptr);
 460         } else if (property == crtc->scaling_filter_property) {
 461                 state->scaling_filter = val;
 462         } else if (crtc->funcs->atomic_set_property) {
 463                 return crtc->funcs->atomic_set_property(crtc, state, property, val);
 464         } else {
 465                 drm_dbg_atomic(crtc->dev,
 466                                "[CRTC:%d:%s] unknown property [PROP:%d:%s]\n",
 467                                crtc->base.id, crtc->name,
 468                                property->base.id, property->name);
 469                 return -EINVAL;
 470         }
 471
 472         return 0;
 473 }
 474
 475 static int
 476 drm_atomic_crtc_get_property(struct drm_crtc *crtc,
 477                 const struct drm_crtc_state *state,
 478                 struct drm_property *property, uint64_t *val)
 479 {
 480         struct drm_device *dev = crtc->dev;
 481         struct drm_mode_config *config = &dev->mode_config;
 482
 483         if (property == config->prop_active)
 484                 *val = drm_atomic_crtc_effectively_active(state);
 485         else if (property == config->prop_mode_id)
 486                 *val = (state->mode_blob) ? state->mode_blob->base.id : 0;
 487         else if (property == config->prop_vrr_enabled)
 488                 *val = state->vrr_enabled;
 489         else if (property == config->degamma_lut_property)
 490                 *val = (state->degamma_lut) ? state->degamma_lut->base.id : 0;
 491         else if (property == config->ctm_property)
 492                 *val = (state->ctm) ? state->ctm->base.id : 0;
 493         else if (property == config->gamma_lut_property)
 494                 *val = (state->gamma_lut) ? state->gamma_lut->base.id : 0;
 495         else if (property == config->prop_out_fence_ptr)
 496                 *val = 0;
 497         else if (property == crtc->scaling_filter_property)
 498                 *val = state->scaling_filter;
 499         else if (crtc->funcs->atomic_get_property)
 500                 return crtc->funcs->atomic_get_property(crtc, state, property, val);
 501         else {
 502                 drm_dbg_atomic(dev,
 503                                "[CRTC:%d:%s] unknown property [PROP:%d:%s]\n",
 504                                crtc->base.id, crtc->name,
 505                                property->base.id, property->name);
 506                 return -EINVAL;
 507         }
 508
 509         return 0;
 510 }
 511
 512 static int drm_atomic_plane_set_property(struct drm_plane *plane,
 513                 struct drm_plane_state *state, struct drm_file *file_priv,
 514                 struct drm_property *property, uint64_t val)
 515 {
 516         struct drm_device *dev = plane->dev;
 517         struct drm_mode_config *config = &dev->mode_config;
 518         bool replaced = false;
 519         int ret;
 520
 521         if (property == config->prop_fb_id) {
 522                 struct drm_framebuffer *fb;
 523
 524                 fb = drm_framebuffer_lookup(dev, file_priv, val);
 525                 drm_atomic_set_fb_for_plane(state, fb);
 526                 if (fb)
 527                         drm_framebuffer_put(fb);
 528         } else if (property == config->prop_in_fence_fd) {
 529                 if (state->fence)
 530                         return -EINVAL;
 531
 532                 if (U642I64(val) == -1)
 533                         return 0;
 534
 535                 state->fence = sync_file_get_fence(val);
 536                 if (!state->fence)
 537                         return -EINVAL;
 538
 539         } else if (property == config->prop_crtc_id) {
 540                 struct drm_crtc *crtc = drm_crtc_find(dev, file_priv, val);
 541
 542                 if (val && !crtc) {
 543                         drm_dbg_atomic(dev,
 544                                        "[PROP:%d:%s] cannot find CRTC with ID %llu\n",
 545                                        property->base.id, property->name, val);
 546                         return -EACCES;
 547                 }
 548                 return drm_atomic_set_crtc_for_plane(state, crtc);
 549         } else if (property == config->prop_crtc_x) {
 550                 state->crtc_x = U642I64(val);
 551         } else if (property == config->prop_crtc_y) {
 552                 state->crtc_y = U642I64(val);
 553         } else if (property == config->prop_crtc_w) {
 554                 state->crtc_w = val;
 555         } else if (property == config->prop_crtc_h) {
 556                 state->crtc_h = val;
 557         } else if (property == config->prop_src_x) {
 558                 state->src_x = val;
 559         } else if (property == config->prop_src_y) {
 560                 state->src_y = val;
 561         } else if (property == config->prop_src_w) {
 562                 state->src_w = val;
 563         } else if (property == config->prop_src_h) {
 564                 state->src_h = val;
 565         } else if (property == plane->alpha_property) {
 566                 state->alpha = val;
 567         } else if (property == plane->blend_mode_property) {
 568                 state->pixel_blend_mode = val;
 569         } else if (property == plane->rotation_property) {
 570                 if (!is_power_of_2(val & DRM_MODE_ROTATE_MASK)) {
 571                         drm_dbg_atomic(plane->dev,
 572                                        "[PLANE:%d:%s] bad rotation bitmask: 0x%llx\n",
 573                                        plane->base.id, plane->name, val);
 574                         return -EINVAL;
 575                 }
 576                 state->rotation = val;
 577         } else if (property == plane->zpos_property) {
 578                 state->zpos = val;
 579         } else if (property == plane->color_encoding_property) {
 580                 state->color_encoding = val;
 581         } else if (property == plane->color_range_property) {
 582                 state->color_range = val;
 583         } else if (property == config->prop_fb_damage_clips) {
 584                 ret = drm_atomic_replace_property_blob_from_id(dev,
 585                                         &state->fb_damage_clips,
 586                                         val,
 587                                         -1,
 588                                         sizeof(struct drm_rect),
 589                                         &replaced);
 590                 return ret;
 591         } else if (property == plane->scaling_filter_property) {
 592                 state->scaling_filter = val;
 593         } else if (plane->funcs->atomic_set_property) {
 594                 return plane->funcs->atomic_set_property(plane, state,
 595                                 property, val);
 596         } else {
 597                 drm_dbg_atomic(plane->dev,
 598                                "[PLANE:%d:%s] unknown property [PROP:%d:%s]\n",
 599                                plane->base.id, plane->name,
 600                                property->base.id, property->name);
 601                 return -EINVAL;
 602         }
 603
 604         return 0;
 605 }
 606
 607 static int
 608 drm_atomic_plane_get_property(struct drm_plane *plane,
 609                 const struct drm_plane_state *state,
 610                 struct drm_property *property, uint64_t *val)
 611 {
 612         struct drm_device *dev = plane->dev;
 613         struct drm_mode_config *config = &dev->mode_config;
 614
 615         if (property == config->prop_fb_id) {
 616                 *val = (state->fb) ? state->fb->base.id : 0;
 617         } else if (property == config->prop_in_fence_fd) {
 618                 *val = -1;
 619         } else if (property == config->prop_crtc_id) {
 620                 *val = (state->crtc) ? state->crtc->base.id : 0;
 621         } else if (property == config->prop_crtc_x) {
 622                 *val = I642U64(state->crtc_x);
 623         } else if (property == config->prop_crtc_y) {
 624                 *val = I642U64(state->crtc_y);
 625         } else if (property == config->prop_crtc_w) {
 626                 *val = state->crtc_w;
 627         } else if (property == config->prop_crtc_h) {
 628                 *val = state->crtc_h;
 629         } else if (property == config->prop_src_x) {
 630                 *val = state->src_x;
 631         } else if (property == config->prop_src_y) {
 632                 *val = state->src_y;
 633         } else if (property == config->prop_src_w) {
 634                 *val = state->src_w;
 635         } else if (property == config->prop_src_h) {
 636                 *val = state->src_h;
 637         } else if (property == plane->alpha_property) {
 638                 *val = state->alpha;
 639         } else if (property == plane->blend_mode_property) {
 640                 *val = state->pixel_blend_mode;
 641         } else if (property == plane->rotation_property) {
 642                 *val = state->rotation;
 643         } else if (property == plane->zpos_property) {
 644                 *val = state->zpos;
 645         } else if (property == plane->color_encoding_property) {
 646                 *val = state->color_encoding;
 647         } else if (property == plane->color_range_property) {
 648                 *val = state->color_range;
 649         } else if (property == config->prop_fb_damage_clips) {
 650                 *val = (state->fb_damage_clips) ?
 651                         state->fb_damage_clips->base.id : 0;
 652         } else if (property == plane->scaling_filter_property) {
 653                 *val = state->scaling_filter;
 654         } else if (plane->funcs->atomic_get_property) {
 655                 return plane->funcs->atomic_get_property(plane, state, property, val);
 656         } else {
 657                 drm_dbg_atomic(dev,
 658                                "[PLANE:%d:%s] unknown property [PROP:%d:%s]\n",
 659                                plane->base.id, plane->name,
 660                                property->base.id, property->name);
 661                 return -EINVAL;
 662         }
 663
 664         return 0;
 665 }
 666
 667 static int drm_atomic_set_writeback_fb_for_connector(
 668                 struct drm_connector_state *conn_state,
 669                 struct drm_framebuffer *fb)
 670 {
 671         int ret;
 672         struct drm_connector *conn = conn_state->connector;
 673
 674         ret = drm_writeback_set_fb(conn_state, fb);
 675         if (ret < 0)
 676                 return ret;
 677
 678         if (fb)
 679                 drm_dbg_atomic(conn->dev,
 680                                "Set [FB:%d] for connector state %p\n",
 681                                fb->base.id, conn_state);
 682         else
 683                 drm_dbg_atomic(conn->dev,
 684                                "Set [NOFB] for connector state %p\n",
 685                                conn_state);
 686
 687         return 0;
 688 }
 689
 690 static int drm_atomic_connector_set_property(struct drm_connector *connector,
 691                 struct drm_connector_state *state, struct drm_file *file_priv,
 692                 struct drm_property *property, uint64_t val)
 693 {
 694         struct drm_device *dev = connector->dev;
 695         struct drm_mode_config *config = &dev->mode_config;
 696         bool replaced = false;
 697         int ret;
 698
 699         if (property == config->prop_crtc_id) {
 700                 struct drm_crtc *crtc = drm_crtc_find(dev, file_priv, val);
 701
 702                 if (val && !crtc) {
 703                         drm_dbg_atomic(dev,
 704                                        "[PROP:%d:%s] cannot find CRTC with ID %llu\n",
 705                                        property->base.id, property->name, val);
 706                         return -EACCES;
 707                 }
 708                 return drm_atomic_set_crtc_for_connector(state, crtc);
 709         } else if (property == config->dpms_property) {
 710                 /* setting DPMS property requires special handling, which
 711                  * is done in legacy setprop path for us.  Disallow (for
 712                  * now?) atomic writes to DPMS property:
 713                  */
 714                 drm_dbg_atomic(dev,
 715                                "legacy [PROP:%d:%s] can only be set via legacy uAPI\n",
 716                                property->base.id, property->name);
 717                 return -EINVAL;
 718         } else if (property == config->tv_select_subconnector_property) {
 719                 state->tv.select_subconnector = val;
 720         } else if (property == config->tv_subconnector_property) {
 721                 state->tv.subconnector = val;
 722         } else if (property == config->tv_left_margin_property) {
 723                 state->tv.margins.left = val;
 724         } else if (property == config->tv_right_margin_property) {
 725                 state->tv.margins.right = val;
 726         } else if (property == config->tv_top_margin_property) {
 727                 state->tv.margins.top = val;
 728         } else if (property == config->tv_bottom_margin_property) {
 729                 state->tv.margins.bottom = val;
 730         } else if (property == config->legacy_tv_mode_property) {
 731                 state->tv.legacy_mode = val;
 732         } else if (property == config->tv_mode_property) {
 733                 state->tv.mode = val;
 734         } else if (property == config->tv_brightness_property) {
 735                 state->tv.brightness = val;
 736         } else if (property == config->tv_contrast_property) {
 737                 state->tv.contrast = val;
 738         } else if (property == config->tv_flicker_reduction_property) {
 739                 state->tv.flicker_reduction = val;
 740         } else if (property == config->tv_overscan_property) {
 741                 state->tv.overscan = val;
 742         } else if (property == config->tv_saturation_property) {
 743                 state->tv.saturation = val;
 744         } else if (property == config->tv_hue_property) {
 745                 state->tv.hue = val;
 746         } else if (property == config->link_status_property) {
 747                 /* Never downgrade from GOOD to BAD on userspace's request here,
 748                  * only hw issues can do that.
 749                  *
 750                  * For an atomic property the userspace doesn't need to be able
 751                  * to understand all the properties, but needs to be able to
 752                  * restore the state it wants on VT switch. So if the userspace
 753                  * tries to change the link_status from GOOD to BAD, driver
 754                  * silently rejects it and returns a 0. This prevents userspace
 755                  * from accidentally breaking  the display when it restores the
 756                  * state.
 757                  */
 758                 if (state->link_status != DRM_LINK_STATUS_GOOD)
 759                         state->link_status = val;
 760         } else if (property == config->hdr_output_metadata_property) {
 761                 ret = drm_atomic_replace_property_blob_from_id(dev,
 762                                 &state->hdr_output_metadata,
 763                                 val,
 764                                 sizeof(struct hdr_output_metadata), -1,
 765                                 &replaced);
 766                 return ret;
 767         } else if (property == config->aspect_ratio_property) {
 768                 state->picture_aspect_ratio = val;
 769         } else if (property == config->content_type_property) {
 770                 state->content_type = val;
 771         } else if (property == connector->scaling_mode_property) {
 772                 state->scaling_mode = val;
 773         } else if (property == config->content_protection_property) {
 774                 if (val == DRM_MODE_CONTENT_PROTECTION_ENABLED) {
 775                         drm_dbg_kms(dev, "only drivers can set CP Enabled\n");
 776                         return -EINVAL;
 777                 }
 778                 state->content_protection = val;
 779         } else if (property == config->hdcp_content_type_property) {
 780                 state->hdcp_content_type = val;
 781         } else if (property == connector->colorspace_property) {
 782                 state->colorspace = val;
 783         } else if (property == config->writeback_fb_id_property) {
 784                 struct drm_framebuffer *fb;
 785                 int ret;
 786
 787                 fb = drm_framebuffer_lookup(dev, file_priv, val);
 788                 ret = drm_atomic_set_writeback_fb_for_connector(state, fb);
 789                 if (fb)
 790                         drm_framebuffer_put(fb);
 791                 return ret;
 792         } else if (property == config->writeback_out_fence_ptr_property) {
 793                 s32 __user *fence_ptr = u64_to_user_ptr(val);
 794
 795                 return set_out_fence_for_connector(state->state, connector,
 796                                                    fence_ptr);
 797         } else if (property == connector->max_bpc_property) {
 798                 state->max_requested_bpc = val;
 799         } else if (property == connector->privacy_screen_sw_state_property) {
 800                 state->privacy_screen_sw_state = val;
 801         } else if (connector->funcs->atomic_set_property) {
 802                 return connector->funcs->atomic_set_property(connector,
 803                                 state, property, val);
 804         } else {
 805                 drm_dbg_atomic(connector->dev,
 806                                "[CONNECTOR:%d:%s] unknown property [PROP:%d:%s]\n",
 807                                connector->base.id, connector->name,
 808                                property->base.id, property->name);
 809                 return -EINVAL;
 810         }
 811
 812         return 0;
 813 }
 814
 815 static int
 816 drm_atomic_connector_get_property(struct drm_connector *connector,
 817                 const struct drm_connector_state *state,
 818                 struct drm_property *property, uint64_t *val)
 819 {
 820         struct drm_device *dev = connector->dev;
 821         struct drm_mode_config *config = &dev->mode_config;
 822
 823         if (property == config->prop_crtc_id) {
 824                 *val = (state->crtc) ? state->crtc->base.id : 0;
 825         } else if (property == config->dpms_property) {
 826                 if (state->crtc && state->crtc->state->self_refresh_active)
 827                         *val = DRM_MODE_DPMS_ON;
 828                 else
 829                         *val = connector->dpms;
 830         } else if (property == config->tv_select_subconnector_property) {
 831                 *val = state->tv.select_subconnector;
 832         } else if (property == config->tv_subconnector_property) {
 833                 *val = state->tv.subconnector;
 834         } else if (property == config->tv_left_margin_property) {
 835                 *val = state->tv.margins.left;
 836         } else if (property == config->tv_right_margin_property) {
 837                 *val = state->tv.margins.right;
 838         } else if (property == config->tv_top_margin_property) {
 839                 *val = state->tv.margins.top;
 840         } else if (property == config->tv_bottom_margin_property) {
 841                 *val = state->tv.margins.bottom;
 842         } else if (property == config->legacy_tv_mode_property) {
 843                 *val = state->tv.legacy_mode;
 844         } else if (property == config->tv_mode_property) {
 845                 *val = state->tv.mode;
 846         } else if (property == config->tv_brightness_property) {
 847                 *val = state->tv.brightness;
 848         } else if (property == config->tv_contrast_property) {
 849                 *val = state->tv.contrast;
 850         } else if (property == config->tv_flicker_reduction_property) {
 851                 *val = state->tv.flicker_reduction;
 852         } else if (property == config->tv_overscan_property) {
 853                 *val = state->tv.overscan;
 854         } else if (property == config->tv_saturation_property) {
 855                 *val = state->tv.saturation;
 856         } else if (property == config->tv_hue_property) {
 857                 *val = state->tv.hue;
 858         } else if (property == config->link_status_property) {
 859                 *val = state->link_status;
 860         } else if (property == config->aspect_ratio_property) {
 861                 *val = state->picture_aspect_ratio;
 862         } else if (property == config->content_type_property) {
 863                 *val = state->content_type;
 864         } else if (property == connector->colorspace_property) {
 865                 *val = state->colorspace;
 866         } else if (property == connector->scaling_mode_property) {
 867                 *val = state->scaling_mode;
 868         } else if (property == config->hdr_output_metadata_property) {
 869                 *val = state->hdr_output_metadata ?
 870                         state->hdr_output_metadata->base.id : 0;
 871         } else if (property == config->content_protection_property) {
 872                 *val = state->content_protection;
 873         } else if (property == config->hdcp_content_type_property) {
 874                 *val = state->hdcp_content_type;
 875         } else if (property == config->writeback_fb_id_property) {
 876                 /* Writeback framebuffer is one-shot, write and forget */
 877                 *val = 0;
 878         } else if (property == config->writeback_out_fence_ptr_property) {
 879                 *val = 0;
 880         } else if (property == connector->max_bpc_property) {
 881                 *val = state->max_requested_bpc;
 882         } else if (property == connector->privacy_screen_sw_state_property) {
 883                 *val = state->privacy_screen_sw_state;
 884         } else if (connector->funcs->atomic_get_property) {
 885                 return connector->funcs->atomic_get_property(connector,
 886                                 state, property, val);
 887         } else {
 888                 drm_dbg_atomic(dev,
 889                                "[CONNECTOR:%d:%s] unknown property [PROP:%d:%s]\n",
 890                                connector->base.id, connector->name,
 891                                property->base.id, property->name);
 892                 return -EINVAL;
 893         }
 894
 895         return 0;
 896 }
 897
 898 int drm_atomic_get_property(struct drm_mode_object *obj,
 899                 struct drm_property *property, uint64_t *val)
 900 {
 901         struct drm_device *dev = property->dev;
 902         int ret;
 903
 904         switch (obj->type) {
 905         case DRM_MODE_OBJECT_CONNECTOR: {
 906                 struct drm_connector *connector = obj_to_connector(obj);
 907
 908                 WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
 909                 ret = drm_atomic_connector_get_property(connector,
 910                                 connector->state, property, val);
 911                 break;
 912         }
 913         case DRM_MODE_OBJECT_CRTC: {
 914                 struct drm_crtc *crtc = obj_to_crtc(obj);
 915
 916                 WARN_ON(!drm_modeset_is_locked(&crtc->mutex));
 917                 ret = drm_atomic_crtc_get_property(crtc,
 918                                 crtc->state, property, val);
 919                 break;
 920         }
 921         case DRM_MODE_OBJECT_PLANE: {
 922                 struct drm_plane *plane = obj_to_plane(obj);
 923
 924                 WARN_ON(!drm_modeset_is_locked(&plane->mutex));
 925                 ret = drm_atomic_plane_get_property(plane,
 926                                 plane->state, property, val);
 927                 break;
 928         }
 929         default:
 930                 drm_dbg_atomic(dev, "[OBJECT:%d] has no properties\n", obj->id);
 931                 ret = -EINVAL;
 932                 break;
 933         }
 934
 935         return ret;
 936 }
 937
 938 /*
 939  * The big monster ioctl
 940  */
 941
 942 static struct drm_pending_vblank_event *create_vblank_event(
 943                 struct drm_crtc *crtc, uint64_t user_data)
 944 {
 945         struct drm_pending_vblank_event *e = NULL;
 946
 947         e = kzalloc(sizeof *e, GFP_KERNEL);
 948         if (!e)
 949                 return NULL;
 950
 951         e->event.base.type = DRM_EVENT_FLIP_COMPLETE;
 952         e->event.base.length = sizeof(e->event);
 953         e->event.vbl.crtc_id = crtc->base.id;
 954         e->event.vbl.user_data = user_data;
 955
 956         return e;
 957 }
 958
 959 int drm_atomic_connector_commit_dpms(struct drm_atomic_state *state,
 960                                      struct drm_connector *connector,
 961                                      int mode)
 962 {
 963         struct drm_connector *tmp_connector;
 964         struct drm_connector_state *new_conn_state;
 965         struct drm_crtc *crtc;
 966         struct drm_crtc_state *crtc_state;
 967         int i, ret, old_mode = connector->dpms;
 968         bool active = false;
 969
 970         ret = drm_modeset_lock(&state->dev->mode_config.connection_mutex,
 971                                state->acquire_ctx);
 972         if (ret)
 973                 return ret;
 974
 975         if (mode != DRM_MODE_DPMS_ON)
 976                 mode = DRM_MODE_DPMS_OFF;
 977         connector->dpms = mode;
 978
 979         crtc = connector->state->crtc;
 980         if (!crtc)
 981                 goto out;
 982         ret = drm_atomic_add_affected_connectors(state, crtc);
 983         if (ret)
 984                 goto out;
 985
 986         crtc_state = drm_atomic_get_crtc_state(state, crtc);
 987         if (IS_ERR(crtc_state)) {
 988                 ret = PTR_ERR(crtc_state);
 989                 goto out;
 990         }
 991
 992         for_each_new_connector_in_state(state, tmp_connector, new_conn_state, i) {
 993                 if (new_conn_state->crtc != crtc)
 994                         continue;
 995                 if (tmp_connector->dpms == DRM_MODE_DPMS_ON) {
 996                         active = true;
 997                         break;
 998                 }
 999         }
1000
1001         crtc_state->active = active;
1002         ret = drm_atomic_commit(state);
1003 out:
1004         if (ret != 0)
1005                 connector->dpms = old_mode;
1006         return ret;
1007 }
1008
1009 int drm_atomic_set_property(struct drm_atomic_state *state,
1010                             struct drm_file *file_priv,
1011                             struct drm_mode_object *obj,
1012                             struct drm_property *prop,
1013                             uint64_t prop_value)
1014 {
1015         struct drm_mode_object *ref;
1016         int ret;
1017
1018         if (!drm_property_change_valid_get(prop, prop_value, &ref))
1019                 return -EINVAL;
1020
1021         switch (obj->type) {
1022         case DRM_MODE_OBJECT_CONNECTOR: {
1023                 struct drm_connector *connector = obj_to_connector(obj);
1024                 struct drm_connector_state *connector_state;
1025
1026                 connector_state = drm_atomic_get_connector_state(state, connector);
1027                 if (IS_ERR(connector_state)) {
1028                         ret = PTR_ERR(connector_state);
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                 ret = drm_atomic_crtc_set_property(crtc,
1048                                 crtc_state, prop, prop_value);
1049                 break;
1050         }
1051         case DRM_MODE_OBJECT_PLANE: {
1052                 struct drm_plane *plane = obj_to_plane(obj);
1053                 struct drm_plane_state *plane_state;
1054
1055                 plane_state = drm_atomic_get_plane_state(state, plane);
1056                 if (IS_ERR(plane_state)) {
1057                         ret = PTR_ERR(plane_state);
1058                         break;
1059                 }
1060
1061                 ret = drm_atomic_plane_set_property(plane,
1062                                 plane_state, file_priv,
1063                                 prop, prop_value);
1064                 break;
1065         }
1066         default:
1067                 drm_dbg_atomic(prop->dev, "[OBJECT:%d] has no properties\n", obj->id);
1068                 ret = -EINVAL;
1069                 break;
1070         }
1071
1072         drm_property_change_valid_put(prop, ref);
1073         return ret;
1074 }
1075
1076 /**
1077  * DOC: explicit fencing properties
1078  *
1079  * Explicit fencing allows userspace to control the buffer synchronization
1080  * between devices. A Fence or a group of fences are transferred to/from
1081  * userspace using Sync File fds and there are two DRM properties for that.
1082  * IN_FENCE_FD on each DRM Plane to send fences to the kernel and
1083  * OUT_FENCE_PTR on each DRM CRTC to receive fences from the kernel.
1084  *
1085  * As a contrast, with implicit fencing the kernel keeps track of any
1086  * ongoing rendering, and automatically ensures that the atomic update waits
1087  * for any pending rendering to complete. This is usually tracked in &struct
1088  * dma_resv which can also contain mandatory kernel fences. Implicit syncing
1089  * is how Linux traditionally worked (e.g. DRI2/3 on X.org), whereas explicit
1090  * fencing is what Android wants.
1091  *
1092  * "IN_FENCE_FD”:
1093  *      Use this property to pass a fence that DRM should wait on before
1094  *      proceeding with the Atomic Commit request and show the framebuffer for
1095  *      the plane on the screen. The fence can be either a normal fence or a
1096  *      merged one, the sync_file framework will handle both cases and use a
1097  *      fence_array if a merged fence is received. Passing -1 here means no
1098  *      fences to wait on.
1099  *
1100  *      If the Atomic Commit request has the DRM_MODE_ATOMIC_TEST_ONLY flag
1101  *      it will only check if the Sync File is a valid one.
1102  *
1103  *      On the driver side the fence is stored on the @fence parameter of
1104  *      &struct drm_plane_state. Drivers which also support implicit fencing
1105  *      should extract the implicit fence using drm_gem_plane_helper_prepare_fb(),
1106  *      to make sure there's consistent behaviour between drivers in precedence
1107  *      of implicit vs. explicit fencing.
1108  *
1109  * "OUT_FENCE_PTR”:
1110  *      Use this property to pass a file descriptor pointer to DRM. Once the
1111  *      Atomic Commit request call returns OUT_FENCE_PTR will be filled with
1112  *      the file descriptor number of a Sync File. This Sync File contains the
1113  *      CRTC fence that will be signaled when all framebuffers present on the
1114  *      Atomic Commit * request for that given CRTC are scanned out on the
1115  *      screen.
1116  *
1117  *      The Atomic Commit request fails if a invalid pointer is passed. If the
1118  *      Atomic Commit request fails for any other reason the out fence fd
1119  *      returned will be -1. On a Atomic Commit with the
1120  *      DRM_MODE_ATOMIC_TEST_ONLY flag the out fence will also be set to -1.
1121  *
1122  *      Note that out-fences don't have a special interface to drivers and are
1123  *      internally represented by a &struct drm_pending_vblank_event in struct
1124  *      &drm_crtc_state, which is also used by the nonblocking atomic commit
1125  *      helpers and for the DRM event handling for existing userspace.
1126  */
1127
1128 struct drm_out_fence_state {
1129         s32 __user *out_fence_ptr;
1130         struct sync_file *sync_file;
1131         int fd;
1132 };
1133
1134 static int setup_out_fence(struct drm_out_fence_state *fence_state,
1135                            struct dma_fence *fence)
1136 {
1137         fence_state->fd = get_unused_fd_flags(O_CLOEXEC);
1138         if (fence_state->fd < 0)
1139                 return fence_state->fd;
1140
1141         if (put_user(fence_state->fd, fence_state->out_fence_ptr))
1142                 return -EFAULT;
1143
1144         fence_state->sync_file = sync_file_create(fence);
1145         if (!fence_state->sync_file)
1146                 return -ENOMEM;
1147
1148         return 0;
1149 }
1150
1151 static int prepare_signaling(struct drm_device *dev,
1152                                   struct drm_atomic_state *state,
1153                                   struct drm_mode_atomic *arg,
1154                                   struct drm_file *file_priv,
1155                                   struct drm_out_fence_state **fence_state,
1156                                   unsigned int *num_fences)
1157 {
1158         struct drm_crtc *crtc;
1159         struct drm_crtc_state *crtc_state;
1160         struct drm_connector *conn;
1161         struct drm_connector_state *conn_state;
1162         int i, c = 0, ret;
1163
1164         if (arg->flags & DRM_MODE_ATOMIC_TEST_ONLY)
1165                 return 0;
1166
1167         for_each_new_crtc_in_state(state, crtc, crtc_state, i) {
1168                 s32 __user *fence_ptr;
1169
1170                 fence_ptr = get_out_fence_for_crtc(crtc_state->state, crtc);
1171
1172                 if (arg->flags & DRM_MODE_PAGE_FLIP_EVENT || fence_ptr) {
1173                         struct drm_pending_vblank_event *e;
1174
1175                         e = create_vblank_event(crtc, arg->user_data);
1176                         if (!e)
1177                                 return -ENOMEM;
1178
1179                         crtc_state->event = e;
1180                 }
1181
1182                 if (arg->flags & DRM_MODE_PAGE_FLIP_EVENT) {
1183                         struct drm_pending_vblank_event *e = crtc_state->event;
1184
1185                         if (!file_priv)
1186                                 continue;
1187
1188                         ret = drm_event_reserve_init(dev, file_priv, &e->base,
1189                                                      &e->event.base);
1190                         if (ret) {
1191                                 kfree(e);
1192                                 crtc_state->event = NULL;
1193                                 return ret;
1194                         }
1195                 }
1196
1197                 if (fence_ptr) {
1198                         struct dma_fence *fence;
1199                         struct drm_out_fence_state *f;
1200
1201                         f = krealloc(*fence_state, sizeof(**fence_state) *
1202                                      (*num_fences + 1), GFP_KERNEL);
1203                         if (!f)
1204                                 return -ENOMEM;
1205
1206                         memset(&f[*num_fences], 0, sizeof(*f));
1207
1208                         f[*num_fences].out_fence_ptr = fence_ptr;
1209                         *fence_state = f;
1210
1211                         fence = drm_crtc_create_fence(crtc);
1212                         if (!fence)
1213                                 return -ENOMEM;
1214
1215                         ret = setup_out_fence(&f[(*num_fences)++], fence);
1216                         if (ret) {
1217                                 dma_fence_put(fence);
1218                                 return ret;
1219                         }
1220
1221                         crtc_state->event->base.fence = fence;
1222                 }
1223
1224                 c++;
1225         }
1226
1227         for_each_new_connector_in_state(state, conn, conn_state, i) {
1228                 struct drm_writeback_connector *wb_conn;
1229                 struct drm_out_fence_state *f;
1230                 struct dma_fence *fence;
1231                 s32 __user *fence_ptr;
1232
1233                 if (!conn_state->writeback_job)
1234                         continue;
1235
1236                 fence_ptr = get_out_fence_for_connector(state, conn);
1237                 if (!fence_ptr)
1238                         continue;
1239
1240                 f = krealloc(*fence_state, sizeof(**fence_state) *
1241                              (*num_fences + 1), GFP_KERNEL);
1242                 if (!f)
1243                         return -ENOMEM;
1244
1245                 memset(&f[*num_fences], 0, sizeof(*f));
1246
1247                 f[*num_fences].out_fence_ptr = fence_ptr;
1248                 *fence_state = f;
1249
1250                 wb_conn = drm_connector_to_writeback(conn);
1251                 fence = drm_writeback_get_out_fence(wb_conn);
1252                 if (!fence)
1253                         return -ENOMEM;
1254
1255                 ret = setup_out_fence(&f[(*num_fences)++], fence);
1256                 if (ret) {
1257                         dma_fence_put(fence);
1258                         return ret;
1259                 }
1260
1261                 conn_state->writeback_job->out_fence = fence;
1262         }
1263
1264         /*
1265          * Having this flag means user mode pends on event which will never
1266          * reach due to lack of at least one CRTC for signaling
1267          */
1268         if (c == 0 && (arg->flags & DRM_MODE_PAGE_FLIP_EVENT)) {
1269                 drm_dbg_atomic(dev, "need at least one CRTC for DRM_MODE_PAGE_FLIP_EVENT");
1270                 return -EINVAL;
1271         }
1272
1273         return 0;
1274 }
1275
1276 static void complete_signaling(struct drm_device *dev,
1277                                struct drm_atomic_state *state,
1278                                struct drm_out_fence_state *fence_state,
1279                                unsigned int num_fences,
1280                                bool install_fds)
1281 {
1282         struct drm_crtc *crtc;
1283         struct drm_crtc_state *crtc_state;
1284         int i;
1285
1286         if (install_fds) {
1287                 for (i = 0; i < num_fences; i++)
1288                         fd_install(fence_state[i].fd,
1289                                    fence_state[i].sync_file->file);
1290
1291                 kfree(fence_state);
1292                 return;
1293         }
1294
1295         for_each_new_crtc_in_state(state, crtc, crtc_state, i) {
1296                 struct drm_pending_vblank_event *event = crtc_state->event;
1297                 /*
1298                  * Free the allocated event. drm_atomic_helper_setup_commit
1299                  * can allocate an event too, so only free it if it's ours
1300                  * to prevent a double free in drm_atomic_state_clear.
1301                  */
1302                 if (event && (event->base.fence || event->base.file_priv)) {
1303                         drm_event_cancel_free(dev, &event->base);
1304                         crtc_state->event = NULL;
1305                 }
1306         }
1307
1308         if (!fence_state)
1309                 return;
1310
1311         for (i = 0; i < num_fences; i++) {
1312                 if (fence_state[i].sync_file)
1313                         fput(fence_state[i].sync_file->file);
1314                 if (fence_state[i].fd >= 0)
1315                         put_unused_fd(fence_state[i].fd);
1316
1317                 /* If this fails log error to the user */
1318                 if (fence_state[i].out_fence_ptr &&
1319                     put_user(-1, fence_state[i].out_fence_ptr))
1320                         drm_dbg_atomic(dev, "Couldn't clear out_fence_ptr\n");
1321         }
1322
1323         kfree(fence_state);
1324 }
1325
1326 int drm_mode_atomic_ioctl(struct drm_device *dev,
1327                           void *data, struct drm_file *file_priv)
1328 {
1329         struct drm_mode_atomic *arg = data;
1330         uint32_t __user *objs_ptr = (uint32_t __user *)(unsigned long)(arg->objs_ptr);
1331         uint32_t __user *count_props_ptr = (uint32_t __user *)(unsigned long)(arg->count_props_ptr);
1332         uint32_t __user *props_ptr = (uint32_t __user *)(unsigned long)(arg->props_ptr);
1333         uint64_t __user *prop_values_ptr = (uint64_t __user *)(unsigned long)(arg->prop_values_ptr);
1334         unsigned int copied_objs, copied_props;
1335         struct drm_atomic_state *state;
1336         struct drm_modeset_acquire_ctx ctx;
1337         struct drm_out_fence_state *fence_state;
1338         int ret = 0;
1339         unsigned int i, j, num_fences;
1340
1341         /* disallow for drivers not supporting atomic: */
1342         if (!drm_core_check_feature(dev, DRIVER_ATOMIC))
1343                 return -EOPNOTSUPP;
1344
1345         /* disallow for userspace that has not enabled atomic cap (even
1346          * though this may be a bit overkill, since legacy userspace
1347          * wouldn't know how to call this ioctl)
1348          */
1349         if (!file_priv->atomic) {
1350                 drm_dbg_atomic(dev,
1351                                "commit failed: atomic cap not enabled\n");
1352                 return -EINVAL;
1353         }
1354
1355         if (arg->flags & ~DRM_MODE_ATOMIC_FLAGS) {
1356                 drm_dbg_atomic(dev, "commit failed: invalid flag\n");
1357                 return -EINVAL;
1358         }
1359
1360         if (arg->reserved) {
1361                 drm_dbg_atomic(dev, "commit failed: reserved field set\n");
1362                 return -EINVAL;
1363         }
1364
1365         if (arg->flags & DRM_MODE_PAGE_FLIP_ASYNC) {
1366                 drm_dbg_atomic(dev,
1367                                "commit failed: invalid flag DRM_MODE_PAGE_FLIP_ASYNC\n");
1368                 return -EINVAL;
1369         }
1370
1371         /* can't test and expect an event at the same time. */
1372         if ((arg->flags & DRM_MODE_ATOMIC_TEST_ONLY) &&
1373                         (arg->flags & DRM_MODE_PAGE_FLIP_EVENT)) {
1374                 drm_dbg_atomic(dev,
1375                                "commit failed: page-flip event requested with test-only commit\n");
1376                 return -EINVAL;
1377         }
1378
1379         state = drm_atomic_state_alloc(dev);
1380         if (!state)
1381                 return -ENOMEM;
1382
1383         drm_modeset_acquire_init(&ctx, DRM_MODESET_ACQUIRE_INTERRUPTIBLE);
1384         state->acquire_ctx = &ctx;
1385         state->allow_modeset = !!(arg->flags & DRM_MODE_ATOMIC_ALLOW_MODESET);
1386
1387 retry:
1388         copied_objs = 0;
1389         copied_props = 0;
1390         fence_state = NULL;
1391         num_fences = 0;
1392
1393         for (i = 0; i < arg->count_objs; i++) {
1394                 uint32_t obj_id, count_props;
1395                 struct drm_mode_object *obj;
1396
1397                 if (get_user(obj_id, objs_ptr + copied_objs)) {
1398                         ret = -EFAULT;
1399                         goto out;
1400                 }
1401
1402                 obj = drm_mode_object_find(dev, file_priv, obj_id, DRM_MODE_OBJECT_ANY);
1403                 if (!obj) {
1404                         drm_dbg_atomic(dev, "cannot find object ID %d", obj_id);
1405                         ret = -ENOENT;
1406                         goto out;
1407                 }
1408
1409                 if (!obj->properties) {
1410                         drm_dbg_atomic(dev, "[OBJECT:%d] has no properties", obj_id);
1411                         drm_mode_object_put(obj);
1412                         ret = -ENOENT;
1413                         goto out;
1414                 }
1415
1416                 if (get_user(count_props, count_props_ptr + copied_objs)) {
1417                         drm_mode_object_put(obj);
1418                         ret = -EFAULT;
1419                         goto out;
1420                 }
1421
1422                 copied_objs++;
1423
1424                 for (j = 0; j < count_props; j++) {
1425                         uint32_t prop_id;
1426                         uint64_t prop_value;
1427                         struct drm_property *prop;
1428
1429                         if (get_user(prop_id, props_ptr + copied_props)) {
1430                                 drm_mode_object_put(obj);
1431                                 ret = -EFAULT;
1432                                 goto out;
1433                         }
1434
1435                         prop = drm_mode_obj_find_prop_id(obj, prop_id);
1436                         if (!prop) {
1437                                 drm_dbg_atomic(dev,
1438                                                "[OBJECT:%d] cannot find property ID %d",
1439                                                obj_id, prop_id);
1440                                 drm_mode_object_put(obj);
1441                                 ret = -ENOENT;
1442                                 goto out;
1443                         }
1444
1445                         if (copy_from_user(&prop_value,
1446                                            prop_values_ptr + copied_props,
1447                                            sizeof(prop_value))) {
1448                                 drm_mode_object_put(obj);
1449                                 ret = -EFAULT;
1450                                 goto out;
1451                         }
1452
1453                         ret = drm_atomic_set_property(state, file_priv,
1454                                                       obj, prop, prop_value);
1455                         if (ret) {
1456                                 drm_mode_object_put(obj);
1457                                 goto out;
1458                         }
1459
1460                         copied_props++;
1461                 }
1462
1463                 drm_mode_object_put(obj);
1464         }
1465
1466         ret = prepare_signaling(dev, state, arg, file_priv, &fence_state,
1467                                 &num_fences);
1468         if (ret)
1469                 goto out;
1470
1471         if (arg->flags & DRM_MODE_ATOMIC_TEST_ONLY) {
1472                 ret = drm_atomic_check_only(state);
1473         } else if (arg->flags & DRM_MODE_ATOMIC_NONBLOCK) {
1474                 ret = drm_atomic_nonblocking_commit(state);
1475         } else {
1476                 ret = drm_atomic_commit(state);
1477         }
1478
1479 out:
1480         complete_signaling(dev, state, fence_state, num_fences, !ret);
1481
1482         if (ret == -EDEADLK) {
1483                 drm_atomic_state_clear(state);
1484                 ret = drm_modeset_backoff(&ctx);
1485                 if (!ret)
1486                         goto retry;
1487         }
1488
1489         drm_atomic_state_put(state);
1490
1491         drm_modeset_drop_locks(&ctx);
1492         drm_modeset_acquire_fini(&ctx);
1493
1494         return ret;
1495 }