drivers/gpu/drm/drm_atomic_uapi.c

   1 /*
   2  * Copyright (C) 2014 Red Hat
   3  * Copyright (C) 2014 Intel Corp.
   4  * Copyright (C) 2018 Intel Corp.
   5  * Copyright (c) 2020, The Linux Foundation. All rights reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included in
  15  * all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  21  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  22  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  23  * OTHER DEALINGS IN THE SOFTWARE.
  24  *
  25  * Authors:
  26  * Rob Clark <robdclark@gmail.com>
  27  * Daniel Vetter <daniel.vetter@ffwll.ch>
  28  */
  29
  30 #include <drm/drm_atomic_uapi.h>
  31 #include <drm/drm_atomic.h>
  32 #include <drm/drm_print.h>
  33 #include <drm/drm_drv.h>
  34 #include <drm/drm_writeback.h>
  35 #include <drm/drm_vblank.h>
  36
  37 #include <linux/dma-fence.h>
  38 #include <linux/uaccess.h>
  39 #include <linux/sync_file.h>
  40 #include <linux/file.h>
  41
  42 #include "drm_crtc_internal.h"
  43
  44 /**
  45  * DOC: overview
  46  *
  47  * This file contains the marshalling and demarshalling glue for the atomic UAPI
  48  * in all its forms: The monster ATOMIC IOCTL itself, code for GET_PROPERTY and
  49  * SET_PROPERTY IOCTLs. Plus interface functions for compatibility helpers and
  50  * drivers which have special needs to construct their own atomic updates, e.g.
  51  * for load detect or similar.
  52  */
  53
  54 /**
  55  * drm_atomic_set_mode_for_crtc - set mode for CRTC
  56  * @state: the CRTC whose incoming state to update
  57  * @mode: kernel-internal mode to use for the CRTC, or NULL to disable
  58  *
  59  * Set a mode (originating from the kernel) on the desired CRTC state and update
  60  * the enable property.
  61  *
  62  * RETURNS:
  63  * Zero on success, error code on failure. Cannot return -EDEADLK.
  64  */
  65 int drm_atomic_set_mode_for_crtc(struct drm_crtc_state *state,
  66                                  const struct drm_display_mode *mode)
  67 {
  68         struct drm_crtc *crtc = state->crtc;
  69         struct drm_mode_modeinfo umode;
  70
  71         /* Early return for no change. */
  72         if (mode && memcmp(&state->mode, mode, sizeof(*mode)) == 0)
  73                 return 0;
  74
  75         drm_property_blob_put(state->mode_blob);
  76         state->mode_blob = NULL;
  77
  78         if (mode) {
  79                 struct drm_property_blob *blob;
  80
  81                 drm_mode_convert_to_umode(&umode, mode);
  82                 blob = drm_property_create_blob(crtc->dev,
  83                                                 sizeof(umode), &umode);
  84                 if (IS_ERR(blob))
  85                         return PTR_ERR(blob);
  86
  87                 drm_mode_copy(&state->mode, mode);
  88
  89                 state->mode_blob = blob;
  90                 state->enable = true;
  91                 drm_dbg_atomic(crtc->dev,
  92                                "Set [MODE:%s] for [CRTC:%d:%s] state %p\n",
  93                                mode->name, crtc->base.id, crtc->name, state);
  94         } else {
  95                 memset(&state->mode, 0, sizeof(state->mode));
  96                 state->enable = false;
  97                 drm_dbg_atomic(crtc->dev,
  98                                "Set [NOMODE] for [CRTC:%d:%s] state %p\n",
  99                                crtc->base.id, crtc->name, state);
 100         }
 101
 102         return 0;
 103 }
 104 EXPORT_SYMBOL(drm_atomic_set_mode_for_crtc);
 105
 106 /**
 107  * drm_atomic_set_mode_prop_for_crtc - set mode for CRTC
 108  * @state: the CRTC whose incoming state to update
 109  * @blob: pointer to blob property to use for mode
 110  *
 111  * Set a mode (originating from a blob property) on the desired CRTC state.
 112  * This function will take a reference on the blob property for the CRTC state,
 113  * and release the reference held on the state's existing mode property, if any
 114  * was set.
 115  *
 116  * RETURNS:
 117  * Zero on success, error code on failure. Cannot return -EDEADLK.
 118  */
 119 int drm_atomic_set_mode_prop_for_crtc(struct drm_crtc_state *state,
 120                                       struct drm_property_blob *blob)
 121 {
 122         struct drm_crtc *crtc = state->crtc;
 123
 124         if (blob == state->mode_blob)
 125                 return 0;
 126
 127         drm_property_blob_put(state->mode_blob);
 128         state->mode_blob = NULL;
 129
 130         memset(&state->mode, 0, sizeof(state->mode));
 131
 132         if (blob) {
 133                 int ret;
 134
 135                 if (blob->length != sizeof(struct drm_mode_modeinfo)) {
 136                         drm_dbg_atomic(crtc->dev,
 137                                        "[CRTC:%d:%s] bad mode blob length: %zu\n",
 138                                        crtc->base.id, crtc->name,
 139                                        blob->length);
 140                         return -EINVAL;
 141                 }
 142
 143                 ret = drm_mode_convert_umode(crtc->dev,
 144                                              &state->mode, blob->data);
 145                 if (ret) {
 146                         drm_dbg_atomic(crtc->dev,
 147                                        "[CRTC:%d:%s] invalid mode (ret=%d, status=%s):\n",
 148                                        crtc->base.id, crtc->name,
 149                                        ret, drm_get_mode_status_name(state->mode.status));
 150                         drm_mode_debug_printmodeline(&state->mode);
 151                         return -EINVAL;
 152                 }
 153
 154                 state->mode_blob = drm_property_blob_get(blob);
 155                 state->enable = true;
 156                 drm_dbg_atomic(crtc->dev,
 157                                "Set [MODE:%s] for [CRTC:%d:%s] state %p\n",
 158                                state->mode.name, crtc->base.id, crtc->name,
 159                                state);
 160         } else {
 161                 state->enable = false;
 162                 drm_dbg_atomic(crtc->dev,
 163                                "Set [NOMODE] for [CRTC:%d:%s] state %p\n",
 164                                crtc->base.id, crtc->name, state);
 165         }
 166
 167         return 0;
 168 }
 169 EXPORT_SYMBOL(drm_atomic_set_mode_prop_for_crtc);
 170
 171 /**
 172  * drm_atomic_set_crtc_for_plane - set CRTC for plane
 173  * @plane_state: the plane whose incoming state to update
 174  * @crtc: CRTC to use for the plane
 175  *
 176  * Changing the assigned CRTC for a plane requires us to grab the lock and state
 177  * for the new CRTC, as needed. This function takes care of all these details
 178  * besides updating the pointer in the state object itself.
 179  *
 180  * Returns:
 181  * 0 on success or can fail with -EDEADLK or -ENOMEM. When the error is EDEADLK
 182  * then the w/w mutex code has detected a deadlock and the entire atomic
 183  * sequence must be restarted. All other errors are fatal.
 184  */
 185 int
 186 drm_atomic_set_crtc_for_plane(struct drm_plane_state *plane_state,
 187                               struct drm_crtc *crtc)
 188 {
 189         struct drm_plane *plane = plane_state->plane;
 190         struct drm_crtc_state *crtc_state;
 191         /* Nothing to do for same crtc*/
 192         if (plane_state->crtc == crtc)
 193                 return 0;
 194         if (plane_state->crtc) {
 195                 crtc_state = drm_atomic_get_crtc_state(plane_state->state,
 196                                                        plane_state->crtc);
 197                 if (WARN_ON(IS_ERR(crtc_state)))
 198                         return PTR_ERR(crtc_state);
 199
 200                 crtc_state->plane_mask &= ~drm_plane_mask(plane);
 201         }
 202
 203         plane_state->crtc = crtc;
 204
 205         if (crtc) {
 206                 crtc_state = drm_atomic_get_crtc_state(plane_state->state,
 207                                                        crtc);
 208                 if (IS_ERR(crtc_state))
 209                         return PTR_ERR(crtc_state);
 210                 crtc_state->plane_mask |= drm_plane_mask(plane);
 211         }
 212
 213         if (crtc)
 214                 drm_dbg_atomic(plane->dev,
 215                                "Link [PLANE:%d:%s] state %p to [CRTC:%d:%s]\n",
 216                                plane->base.id, plane->name, plane_state,
 217                                crtc->base.id, crtc->name);
 218         else
 219                 drm_dbg_atomic(plane->dev,
 220                                "Link [PLANE:%d:%s] state %p to [NOCRTC]\n",
 221                                plane->base.id, plane->name, plane_state);
 222
 223         return 0;
 224 }
 225 EXPORT_SYMBOL(drm_atomic_set_crtc_for_plane);
 226
 227 /**
 228  * drm_atomic_set_fb_for_plane - set framebuffer for plane
 229  * @plane_state: atomic state object for the plane
 230  * @fb: fb to use for the plane
 231  *
 232  * Changing the assigned framebuffer for a plane requires us to grab a reference
 233  * to the new fb and drop the reference to the old fb, if there is one. This
 234  * function takes care of all these details besides updating the pointer in the
 235  * state object itself.
 236  */
 237 void
 238 drm_atomic_set_fb_for_plane(struct drm_plane_state *plane_state,
 239                             struct drm_framebuffer *fb)
 240 {
 241         struct drm_plane *plane = plane_state->plane;
 242
 243         if (fb)
 244                 drm_dbg_atomic(plane->dev,
 245                                "Set [FB:%d] for [PLANE:%d:%s] state %p\n",
 246                                fb->base.id, plane->base.id, plane->name,
 247                                plane_state);
 248         else
 249                 drm_dbg_atomic(plane->dev,
 250                                "Set [NOFB] for [PLANE:%d:%s] state %p\n",
 251                                plane->base.id, plane->name, plane_state);
 252
 253         drm_framebuffer_assign(&plane_state->fb, fb);
 254 }
 255 EXPORT_SYMBOL(drm_atomic_set_fb_for_plane);
 256
 257 /**
 258  * drm_atomic_set_crtc_for_connector - set CRTC for connector
 259  * @conn_state: atomic state object for the connector
 260  * @crtc: CRTC to use for the connector
 261  *
 262  * Changing the assigned CRTC for a connector requires us to grab the lock and
 263  * state for the new CRTC, as needed. This function takes care of all these
 264  * details besides updating the pointer in the state object itself.
 265  *
 266  * Returns:
 267  * 0 on success or can fail with -EDEADLK or -ENOMEM. When the error is EDEADLK
 268  * then the w/w mutex code has detected a deadlock and the entire atomic
 269  * sequence must be restarted. All other errors are fatal.
 270  */
 271 int
 272 drm_atomic_set_crtc_for_connector(struct drm_connector_state *conn_state,
 273                                   struct drm_crtc *crtc)
 274 {
 275         struct drm_connector *connector = conn_state->connector;
 276         struct drm_crtc_state *crtc_state;
 277
 278         if (conn_state->crtc == crtc)
 279                 return 0;
 280
 281         if (conn_state->crtc) {
 282                 crtc_state = drm_atomic_get_new_crtc_state(conn_state->state,
 283                                                            conn_state->crtc);
 284
 285                 crtc_state->connector_mask &=
 286                         ~drm_connector_mask(conn_state->connector);
 287
 288                 drm_connector_put(conn_state->connector);
 289                 conn_state->crtc = NULL;
 290         }
 291
 292         if (crtc) {
 293                 crtc_state = drm_atomic_get_crtc_state(conn_state->state, crtc);
 294                 if (IS_ERR(crtc_state))
 295                         return PTR_ERR(crtc_state);
 296
 297                 crtc_state->connector_mask |=
 298                         drm_connector_mask(conn_state->connector);
 299
 300                 drm_connector_get(conn_state->connector);
 301                 conn_state->crtc = crtc;
 302
 303                 drm_dbg_atomic(connector->dev,
 304                                "Link [CONNECTOR:%d:%s] state %p to [CRTC:%d:%s]\n",
 305                                connector->base.id, connector->name,
 306                                conn_state, crtc->base.id, crtc->name);
 307         } else {
 308                 drm_dbg_atomic(connector->dev,
 309                                "Link [CONNECTOR:%d:%s] state %p to [NOCRTC]\n",
 310                                connector->base.id, connector->name,
 311                                conn_state);
 312         }
 313
 314         return 0;
 315 }
 316 EXPORT_SYMBOL(drm_atomic_set_crtc_for_connector);
 317
 318 static void set_out_fence_for_crtc(struct drm_atomic_state *state,
 319                                    struct drm_crtc *crtc, s32 __user *fence_ptr)
 320 {
 321         state->crtcs[drm_crtc_index(crtc)].out_fence_ptr = fence_ptr;
 322 }
 323
 324 static s32 __user *get_out_fence_for_crtc(struct drm_atomic_state *state,
 325                                           struct drm_crtc *crtc)
 326 {
 327         s32 __user *fence_ptr;
 328
 329         fence_ptr = state->crtcs[drm_crtc_index(crtc)].out_fence_ptr;
 330         state->crtcs[drm_crtc_index(crtc)].out_fence_ptr = NULL;
 331
 332         return fence_ptr;
 333 }
 334
 335 static int set_out_fence_for_connector(struct drm_atomic_state *state,
 336                                         struct drm_connector *connector,
 337                                         s32 __user *fence_ptr)
 338 {
 339         unsigned int index = drm_connector_index(connector);
 340
 341         if (!fence_ptr)
 342                 return 0;
 343
 344         if (put_user(-1, fence_ptr))
 345                 return -EFAULT;
 346
 347         state->connectors[index].out_fence_ptr = fence_ptr;
 348
 349         return 0;
 350 }
 351
 352 static s32 __user *get_out_fence_for_connector(struct drm_atomic_state *state,
 353                                                struct drm_connector *connector)
 354 {
 355         unsigned int index = drm_connector_index(connector);
 356         s32 __user *fence_ptr;
 357
 358         fence_ptr = state->connectors[index].out_fence_ptr;
 359         state->connectors[index].out_fence_ptr = NULL;
 360
 361         return fence_ptr;
 362 }
 363
 364 static int
 365 drm_atomic_replace_property_blob_from_id(struct drm_device *dev,
 366                                          struct drm_property_blob **blob,
 367                                          uint64_t blob_id,
 368                                          ssize_t expected_size,
 369                                          ssize_t expected_elem_size,
 370                                          bool *replaced)
 371 {
 372         struct drm_property_blob *new_blob = NULL;
 373
 374         if (blob_id != 0) {
 375                 new_blob = drm_property_lookup_blob(dev, blob_id);
 376                 if (new_blob == NULL)
 377                         return -EINVAL;
 378
 379                 if (expected_size > 0 &&
 380                     new_blob->length != expected_size) {
 381                         drm_property_blob_put(new_blob);
 382                         return -EINVAL;
 383                 }
 384                 if (expected_elem_size > 0 &&
 385                     new_blob->length % expected_elem_size != 0) {
 386                         drm_property_blob_put(new_blob);
 387                         return -EINVAL;
 388                 }
 389         }
 390
 391         *replaced |= drm_property_replace_blob(blob, new_blob);
 392         drm_property_blob_put(new_blob);
 393
 394         return 0;
 395 }
 396
 397 static int drm_atomic_crtc_set_property(struct drm_crtc *crtc,
 398                 struct drm_crtc_state *state, struct drm_property *property,
 399                 uint64_t val)
 400 {
 401         struct drm_device *dev = crtc->dev;
 402         struct drm_mode_config *config = &dev->mode_config;
 403         bool replaced = false;
 404         int ret;
 405
 406         if (property == config->prop_active)
 407                 state->active = val;
 408         else if (property == config->prop_mode_id) {
 409                 struct drm_property_blob *mode =
 410                         drm_property_lookup_blob(dev, val);
 411                 ret = drm_atomic_set_mode_prop_for_crtc(state, mode);
 412                 drm_property_blob_put(mode);
 413                 return ret;
 414         } else if (property == config->prop_vrr_enabled) {
 415                 state->vrr_enabled = val;
 416         } else if (property == config->degamma_lut_property) {
 417                 ret = drm_atomic_replace_property_blob_from_id(dev,
 418                                         &state->degamma_lut,
 419                                         val,
 420                                         -1, sizeof(struct drm_color_lut),
 421                                         &replaced);
 422                 state->color_mgmt_changed |= replaced;
 423                 return ret;
 424         } else if (property == config->ctm_property) {
 425                 ret = drm_atomic_replace_property_blob_from_id(dev,
 426                                         &state->ctm,
 427                                         val,
 428                                         sizeof(struct drm_color_ctm), -1,
 429                                         &replaced);
 430                 state->color_mgmt_changed |= replaced;
 431                 return ret;
 432         } else if (property == config->gamma_lut_property) {
 433                 ret = drm_atomic_replace_property_blob_from_id(dev,
 434                                         &state->gamma_lut,
 435                                         val,
 436                                         -1, sizeof(struct drm_color_lut),
 437                                         &replaced);
 438                 state->color_mgmt_changed |= replaced;
 439                 return ret;
 440         } else if (property == config->prop_out_fence_ptr) {
 441                 s32 __user *fence_ptr = u64_to_user_ptr(val);
 442
 443                 if (!fence_ptr)
 444                         return 0;
 445
 446                 if (put_user(-1, fence_ptr))
 447                         return -EFAULT;
 448
 449                 set_out_fence_for_crtc(state->state, crtc, fence_ptr);
 450         } else if (property == crtc->scaling_filter_property) {
 451                 state->scaling_filter = val;
 452         } else if (crtc->funcs->atomic_set_property) {
 453                 return crtc->funcs->atomic_set_property(crtc, state, property, val);
 454         } else {
 455                 drm_dbg_atomic(crtc->dev,
 456                                "[CRTC:%d:%s] unknown property [PROP:%d:%s]]\n",
 457                                crtc->base.id, crtc->name,
 458                                property->base.id, property->name);
 459                 return -EINVAL;
 460         }
 461
 462         return 0;
 463 }
 464
 465 static int
 466 drm_atomic_crtc_get_property(struct drm_crtc *crtc,
 467                 const struct drm_crtc_state *state,
 468                 struct drm_property *property, uint64_t *val)
 469 {
 470         struct drm_device *dev = crtc->dev;
 471         struct drm_mode_config *config = &dev->mode_config;
 472
 473         if (property == config->prop_active)
 474                 *val = drm_atomic_crtc_effectively_active(state);
 475         else if (property == config->prop_mode_id)
 476                 *val = (state->mode_blob) ? state->mode_blob->base.id : 0;
 477         else if (property == config->prop_vrr_enabled)
 478                 *val = state->vrr_enabled;
 479         else if (property == config->degamma_lut_property)
 480                 *val = (state->degamma_lut) ? state->degamma_lut->base.id : 0;
 481         else if (property == config->ctm_property)
 482                 *val = (state->ctm) ? state->ctm->base.id : 0;
 483         else if (property == config->gamma_lut_property)
 484                 *val = (state->gamma_lut) ? state->gamma_lut->base.id : 0;
 485         else if (property == config->prop_out_fence_ptr)
 486                 *val = 0;
 487         else if (property == crtc->scaling_filter_property)
 488                 *val = state->scaling_filter;
 489         else if (crtc->funcs->atomic_get_property)
 490                 return crtc->funcs->atomic_get_property(crtc, state, property, val);
 491         else
 492                 return -EINVAL;
 493
 494         return 0;
 495 }
 496
 497 static int drm_atomic_plane_set_property(struct drm_plane *plane,
 498                 struct drm_plane_state *state, struct drm_file *file_priv,
 499                 struct drm_property *property, uint64_t val)
 500 {
 501         struct drm_device *dev = plane->dev;
 502         struct drm_mode_config *config = &dev->mode_config;
 503         bool replaced = false;
 504         int ret;
 505
 506         if (property == config->prop_fb_id) {
 507                 struct drm_framebuffer *fb;
 508
 509                 fb = drm_framebuffer_lookup(dev, file_priv, val);
 510                 drm_atomic_set_fb_for_plane(state, fb);
 511                 if (fb)
 512                         drm_framebuffer_put(fb);
 513         } else if (property == config->prop_in_fence_fd) {
 514                 if (state->fence)
 515                         return -EINVAL;
 516
 517                 if (U642I64(val) == -1)
 518                         return 0;
 519
 520                 state->fence = sync_file_get_fence(val);
 521                 if (!state->fence)
 522                         return -EINVAL;
 523
 524         } else if (property == config->prop_crtc_id) {
 525                 struct drm_crtc *crtc = drm_crtc_find(dev, file_priv, val);
 526
 527                 if (val && !crtc)
 528                         return -EACCES;
 529                 return drm_atomic_set_crtc_for_plane(state, crtc);
 530         } else if (property == config->prop_crtc_x) {
 531                 state->crtc_x = U642I64(val);
 532         } else if (property == config->prop_crtc_y) {
 533                 state->crtc_y = U642I64(val);
 534         } else if (property == config->prop_crtc_w) {
 535                 state->crtc_w = val;
 536         } else if (property == config->prop_crtc_h) {
 537                 state->crtc_h = val;
 538         } else if (property == config->prop_src_x) {
 539                 state->src_x = val;
 540         } else if (property == config->prop_src_y) {
 541                 state->src_y = val;
 542         } else if (property == config->prop_src_w) {
 543                 state->src_w = val;
 544         } else if (property == config->prop_src_h) {
 545                 state->src_h = val;
 546         } else if (property == plane->alpha_property) {
 547                 state->alpha = val;
 548         } else if (property == plane->blend_mode_property) {
 549                 state->pixel_blend_mode = val;
 550         } else if (property == plane->rotation_property) {
 551                 if (!is_power_of_2(val & DRM_MODE_ROTATE_MASK)) {
 552                         drm_dbg_atomic(plane->dev,
 553                                        "[PLANE:%d:%s] bad rotation bitmask: 0x%llx\n",
 554                                        plane->base.id, plane->name, val);
 555                         return -EINVAL;
 556                 }
 557                 state->rotation = val;
 558         } else if (property == plane->zpos_property) {
 559                 state->zpos = val;
 560         } else if (property == plane->color_encoding_property) {
 561                 state->color_encoding = val;
 562         } else if (property == plane->color_range_property) {
 563                 state->color_range = val;
 564         } else if (property == config->prop_fb_damage_clips) {
 565                 ret = drm_atomic_replace_property_blob_from_id(dev,
 566                                         &state->fb_damage_clips,
 567                                         val,
 568                                         -1,
 569                                         sizeof(struct drm_rect),
 570                                         &replaced);
 571                 return ret;
 572         } else if (property == plane->scaling_filter_property) {
 573                 state->scaling_filter = val;
 574         } else if (plane->funcs->atomic_set_property) {
 575                 return plane->funcs->atomic_set_property(plane, state,
 576                                 property, val);
 577         } else {
 578                 drm_dbg_atomic(plane->dev,
 579                                "[PLANE:%d:%s] unknown property [PROP:%d:%s]]\n",
 580                                plane->base.id, plane->name,
 581                                property->base.id, property->name);
 582                 return -EINVAL;
 583         }
 584
 585         return 0;
 586 }
 587
 588 static int
 589 drm_atomic_plane_get_property(struct drm_plane *plane,
 590                 const struct drm_plane_state *state,
 591                 struct drm_property *property, uint64_t *val)
 592 {
 593         struct drm_device *dev = plane->dev;
 594         struct drm_mode_config *config = &dev->mode_config;
 595
 596         if (property == config->prop_fb_id) {
 597                 *val = (state->fb) ? state->fb->base.id : 0;
 598         } else if (property == config->prop_in_fence_fd) {
 599                 *val = -1;
 600         } else if (property == config->prop_crtc_id) {
 601                 *val = (state->crtc) ? state->crtc->base.id : 0;
 602         } else if (property == config->prop_crtc_x) {
 603                 *val = I642U64(state->crtc_x);
 604         } else if (property == config->prop_crtc_y) {
 605                 *val = I642U64(state->crtc_y);
 606         } else if (property == config->prop_crtc_w) {
 607                 *val = state->crtc_w;
 608         } else if (property == config->prop_crtc_h) {
 609                 *val = state->crtc_h;
 610         } else if (property == config->prop_src_x) {
 611                 *val = state->src_x;
 612         } else if (property == config->prop_src_y) {
 613                 *val = state->src_y;
 614         } else if (property == config->prop_src_w) {
 615                 *val = state->src_w;
 616         } else if (property == config->prop_src_h) {
 617                 *val = state->src_h;
 618         } else if (property == plane->alpha_property) {
 619                 *val = state->alpha;
 620         } else if (property == plane->blend_mode_property) {
 621                 *val = state->pixel_blend_mode;
 622         } else if (property == plane->rotation_property) {
 623                 *val = state->rotation;
 624         } else if (property == plane->zpos_property) {
 625                 *val = state->zpos;
 626         } else if (property == plane->color_encoding_property) {
 627                 *val = state->color_encoding;
 628         } else if (property == plane->color_range_property) {
 629                 *val = state->color_range;
 630         } else if (property == config->prop_fb_damage_clips) {
 631                 *val = (state->fb_damage_clips) ?
 632                         state->fb_damage_clips->base.id : 0;
 633         } else if (property == plane->scaling_filter_property) {
 634                 *val = state->scaling_filter;
 635         } else if (plane->funcs->atomic_get_property) {
 636                 return plane->funcs->atomic_get_property(plane, state, property, val);
 637         } else {
 638                 return -EINVAL;
 639         }
 640
 641         return 0;
 642 }
 643
 644 static int drm_atomic_set_writeback_fb_for_connector(
 645                 struct drm_connector_state *conn_state,
 646                 struct drm_framebuffer *fb)
 647 {
 648         int ret;
 649         struct drm_connector *conn = conn_state->connector;
 650
 651         ret = drm_writeback_set_fb(conn_state, fb);
 652         if (ret < 0)
 653                 return ret;
 654
 655         if (fb)
 656                 drm_dbg_atomic(conn->dev,
 657                                "Set [FB:%d] for connector state %p\n",
 658                                fb->base.id, conn_state);
 659         else
 660                 drm_dbg_atomic(conn->dev,
 661                                "Set [NOFB] for connector state %p\n",
 662                                conn_state);
 663
 664         return 0;
 665 }
 666
 667 static int drm_atomic_connector_set_property(struct drm_connector *connector,
 668                 struct drm_connector_state *state, struct drm_file *file_priv,
 669                 struct drm_property *property, uint64_t val)
 670 {
 671         struct drm_device *dev = connector->dev;
 672         struct drm_mode_config *config = &dev->mode_config;
 673         bool replaced = false;
 674         int ret;
 675
 676         if (property == config->prop_crtc_id) {
 677                 struct drm_crtc *crtc = drm_crtc_find(dev, file_priv, val);
 678
 679                 if (val && !crtc)
 680                         return -EACCES;
 681                 return drm_atomic_set_crtc_for_connector(state, crtc);
 682         } else if (property == config->dpms_property) {
 683                 /* setting DPMS property requires special handling, which
 684                  * is done in legacy setprop path for us.  Disallow (for
 685                  * now?) atomic writes to DPMS property:
 686                  */
 687                 return -EINVAL;
 688         } else if (property == config->tv_select_subconnector_property) {
 689                 state->tv.subconnector = val;
 690         } else if (property == config->tv_left_margin_property) {
 691                 state->tv.margins.left = val;
 692         } else if (property == config->tv_right_margin_property) {
 693                 state->tv.margins.right = val;
 694         } else if (property == config->tv_top_margin_property) {
 695                 state->tv.margins.top = val;
 696         } else if (property == config->tv_bottom_margin_property) {
 697                 state->tv.margins.bottom = val;
 698         } else if (property == config->tv_mode_property) {
 699                 state->tv.mode = val;
 700         } else if (property == config->tv_brightness_property) {
 701                 state->tv.brightness = val;
 702         } else if (property == config->tv_contrast_property) {
 703                 state->tv.contrast = val;
 704         } else if (property == config->tv_flicker_reduction_property) {
 705                 state->tv.flicker_reduction = val;
 706         } else if (property == config->tv_overscan_property) {
 707                 state->tv.overscan = val;
 708         } else if (property == config->tv_saturation_property) {
 709                 state->tv.saturation = val;
 710         } else if (property == config->tv_hue_property) {
 711                 state->tv.hue = val;
 712         } else if (property == config->link_status_property) {
 713                 /* Never downgrade from GOOD to BAD on userspace's request here,
 714                  * only hw issues can do that.
 715                  *
 716                  * For an atomic property the userspace doesn't need to be able
 717                  * to understand all the properties, but needs to be able to
 718                  * restore the state it wants on VT switch. So if the userspace
 719                  * tries to change the link_status from GOOD to BAD, driver
 720                  * silently rejects it and returns a 0. This prevents userspace
 721                  * from accidentally breaking  the display when it restores the
 722                  * state.
 723                  */
 724                 if (state->link_status != DRM_LINK_STATUS_GOOD)
 725                         state->link_status = val;
 726         } else if (property == config->hdr_output_metadata_property) {
 727                 ret = drm_atomic_replace_property_blob_from_id(dev,
 728                                 &state->hdr_output_metadata,
 729                                 val,
 730                                 sizeof(struct hdr_output_metadata), -1,
 731                                 &replaced);
 732                 return ret;
 733         } else if (property == config->aspect_ratio_property) {
 734                 state->picture_aspect_ratio = val;
 735         } else if (property == config->content_type_property) {
 736                 state->content_type = val;
 737         } else if (property == connector->scaling_mode_property) {
 738                 state->scaling_mode = val;
 739         } else if (property == config->content_protection_property) {
 740                 if (val == DRM_MODE_CONTENT_PROTECTION_ENABLED) {
 741                         drm_dbg_kms(dev, "only drivers can set CP Enabled\n");
 742                         return -EINVAL;
 743                 }
 744                 state->content_protection = val;
 745         } else if (property == config->hdcp_content_type_property) {
 746                 state->hdcp_content_type = val;
 747         } else if (property == connector->colorspace_property) {
 748                 state->colorspace = val;
 749         } else if (property == config->writeback_fb_id_property) {
 750                 struct drm_framebuffer *fb;
 751                 int ret;
 752
 753                 fb = drm_framebuffer_lookup(dev, file_priv, val);
 754                 ret = drm_atomic_set_writeback_fb_for_connector(state, fb);
 755                 if (fb)
 756                         drm_framebuffer_put(fb);
 757                 return ret;
 758         } else if (property == config->writeback_out_fence_ptr_property) {
 759                 s32 __user *fence_ptr = u64_to_user_ptr(val);
 760
 761                 return set_out_fence_for_connector(state->state, connector,
 762                                                    fence_ptr);
 763         } else if (property == connector->max_bpc_property) {
 764                 state->max_requested_bpc = val;
 765         } else if (property == connector->privacy_screen_sw_state_property) {
 766                 state->privacy_screen_sw_state = val;
 767         } else if (connector->funcs->atomic_set_property) {
 768                 return connector->funcs->atomic_set_property(connector,
 769                                 state, property, val);
 770         } else {
 771                 drm_dbg_atomic(connector->dev,
 772                                "[CONNECTOR:%d:%s] unknown property [PROP:%d:%s]]\n",
 773                                connector->base.id, connector->name,
 774                                property->base.id, property->name);
 775                 return -EINVAL;
 776         }
 777
 778         return 0;
 779 }
 780
 781 static int
 782 drm_atomic_connector_get_property(struct drm_connector *connector,
 783                 const struct drm_connector_state *state,
 784                 struct drm_property *property, uint64_t *val)
 785 {
 786         struct drm_device *dev = connector->dev;
 787         struct drm_mode_config *config = &dev->mode_config;
 788
 789         if (property == config->prop_crtc_id) {
 790                 *val = (state->crtc) ? state->crtc->base.id : 0;
 791         } else if (property == config->dpms_property) {
 792                 if (state->crtc && state->crtc->state->self_refresh_active)
 793                         *val = DRM_MODE_DPMS_ON;
 794                 else
 795                         *val = connector->dpms;
 796         } else if (property == config->tv_select_subconnector_property) {
 797                 *val = state->tv.subconnector;
 798         } else if (property == config->tv_left_margin_property) {
 799                 *val = state->tv.margins.left;
 800         } else if (property == config->tv_right_margin_property) {
 801                 *val = state->tv.margins.right;
 802         } else if (property == config->tv_top_margin_property) {
 803                 *val = state->tv.margins.top;
 804         } else if (property == config->tv_bottom_margin_property) {
 805                 *val = state->tv.margins.bottom;
 806         } else if (property == config->tv_mode_property) {
 807                 *val = state->tv.mode;
 808         } else if (property == config->tv_brightness_property) {
 809                 *val = state->tv.brightness;
 810         } else if (property == config->tv_contrast_property) {
 811                 *val = state->tv.contrast;
 812         } else if (property == config->tv_flicker_reduction_property) {
 813                 *val = state->tv.flicker_reduction;
 814         } else if (property == config->tv_overscan_property) {
 815                 *val = state->tv.overscan;
 816         } else if (property == config->tv_saturation_property) {
 817                 *val = state->tv.saturation;
 818         } else if (property == config->tv_hue_property) {
 819                 *val = state->tv.hue;
 820         } else if (property == config->link_status_property) {
 821                 *val = state->link_status;
 822         } else if (property == config->aspect_ratio_property) {
 823                 *val = state->picture_aspect_ratio;
 824         } else if (property == config->content_type_property) {
 825                 *val = state->content_type;
 826         } else if (property == connector->colorspace_property) {
 827                 *val = state->colorspace;
 828         } else if (property == connector->scaling_mode_property) {
 829                 *val = state->scaling_mode;
 830         } else if (property == config->hdr_output_metadata_property) {
 831                 *val = state->hdr_output_metadata ?
 832                         state->hdr_output_metadata->base.id : 0;
 833         } else if (property == config->content_protection_property) {
 834                 *val = state->content_protection;
 835         } else if (property == config->hdcp_content_type_property) {
 836                 *val = state->hdcp_content_type;
 837         } else if (property == config->writeback_fb_id_property) {
 838                 /* Writeback framebuffer is one-shot, write and forget */
 839                 *val = 0;
 840         } else if (property == config->writeback_out_fence_ptr_property) {
 841                 *val = 0;
 842         } else if (property == connector->max_bpc_property) {
 843                 *val = state->max_requested_bpc;
 844         } else if (property == connector->privacy_screen_sw_state_property) {
 845                 *val = state->privacy_screen_sw_state;
 846         } else if (connector->funcs->atomic_get_property) {
 847                 return connector->funcs->atomic_get_property(connector,
 848                                 state, property, val);
 849         } else {
 850                 return -EINVAL;
 851         }
 852
 853         return 0;
 854 }
 855
 856 int drm_atomic_get_property(struct drm_mode_object *obj,
 857                 struct drm_property *property, uint64_t *val)
 858 {
 859         struct drm_device *dev = property->dev;
 860         int ret;
 861
 862         switch (obj->type) {
 863         case DRM_MODE_OBJECT_CONNECTOR: {
 864                 struct drm_connector *connector = obj_to_connector(obj);
 865
 866                 WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
 867                 ret = drm_atomic_connector_get_property(connector,
 868                                 connector->state, property, val);
 869                 break;
 870         }
 871         case DRM_MODE_OBJECT_CRTC: {
 872                 struct drm_crtc *crtc = obj_to_crtc(obj);
 873
 874                 WARN_ON(!drm_modeset_is_locked(&crtc->mutex));
 875                 ret = drm_atomic_crtc_get_property(crtc,
 876                                 crtc->state, property, val);
 877                 break;
 878         }
 879         case DRM_MODE_OBJECT_PLANE: {
 880                 struct drm_plane *plane = obj_to_plane(obj);
 881
 882                 WARN_ON(!drm_modeset_is_locked(&plane->mutex));
 883                 ret = drm_atomic_plane_get_property(plane,
 884                                 plane->state, property, val);
 885                 break;
 886         }
 887         default:
 888                 ret = -EINVAL;
 889                 break;
 890         }
 891
 892         return ret;
 893 }
 894
 895 /*
 896  * The big monster ioctl
 897  */
 898
 899 static struct drm_pending_vblank_event *create_vblank_event(
 900                 struct drm_crtc *crtc, uint64_t user_data)
 901 {
 902         struct drm_pending_vblank_event *e = NULL;
 903
 904         e = kzalloc(sizeof *e, GFP_KERNEL);
 905         if (!e)
 906                 return NULL;
 907
 908         e->event.base.type = DRM_EVENT_FLIP_COMPLETE;
 909         e->event.base.length = sizeof(e->event);
 910         e->event.vbl.crtc_id = crtc->base.id;
 911         e->event.vbl.user_data = user_data;
 912
 913         return e;
 914 }
 915
 916 int drm_atomic_connector_commit_dpms(struct drm_atomic_state *state,
 917                                      struct drm_connector *connector,
 918                                      int mode)
 919 {
 920         struct drm_connector *tmp_connector;
 921         struct drm_connector_state *new_conn_state;
 922         struct drm_crtc *crtc;
 923         struct drm_crtc_state *crtc_state;
 924         int i, ret, old_mode = connector->dpms;
 925         bool active = false;
 926
 927         ret = drm_modeset_lock(&state->dev->mode_config.connection_mutex,
 928                                state->acquire_ctx);
 929         if (ret)
 930                 return ret;
 931
 932         if (mode != DRM_MODE_DPMS_ON)
 933                 mode = DRM_MODE_DPMS_OFF;
 934         connector->dpms = mode;
 935
 936         crtc = connector->state->crtc;
 937         if (!crtc)
 938                 goto out;
 939         ret = drm_atomic_add_affected_connectors(state, crtc);
 940         if (ret)
 941                 goto out;
 942
 943         crtc_state = drm_atomic_get_crtc_state(state, crtc);
 944         if (IS_ERR(crtc_state)) {
 945                 ret = PTR_ERR(crtc_state);
 946                 goto out;
 947         }
 948
 949         for_each_new_connector_in_state(state, tmp_connector, new_conn_state, i) {
 950                 if (new_conn_state->crtc != crtc)
 951                         continue;
 952                 if (tmp_connector->dpms == DRM_MODE_DPMS_ON) {
 953                         active = true;
 954                         break;
 955                 }
 956         }
 957
 958         crtc_state->active = active;
 959         ret = drm_atomic_commit(state);
 960 out:
 961         if (ret != 0)
 962                 connector->dpms = old_mode;
 963         return ret;
 964 }
 965
 966 int drm_atomic_set_property(struct drm_atomic_state *state,
 967                             struct drm_file *file_priv,
 968                             struct drm_mode_object *obj,
 969                             struct drm_property *prop,
 970                             uint64_t prop_value)
 971 {
 972         struct drm_mode_object *ref;
 973         int ret;
 974
 975         if (!drm_property_change_valid_get(prop, prop_value, &ref))
 976                 return -EINVAL;
 977
 978         switch (obj->type) {
 979         case DRM_MODE_OBJECT_CONNECTOR: {
 980                 struct drm_connector *connector = obj_to_connector(obj);
 981                 struct drm_connector_state *connector_state;
 982
 983                 connector_state = drm_atomic_get_connector_state(state, connector);
 984                 if (IS_ERR(connector_state)) {
 985                         ret = PTR_ERR(connector_state);
 986                         break;
 987                 }
 988
 989                 ret = drm_atomic_connector_set_property(connector,
 990                                 connector_state, file_priv,
 991                                 prop, prop_value);
 992                 break;
 993         }
 994         case DRM_MODE_OBJECT_CRTC: {
 995                 struct drm_crtc *crtc = obj_to_crtc(obj);
 996                 struct drm_crtc_state *crtc_state;
 997
 998                 crtc_state = drm_atomic_get_crtc_state(state, crtc);
 999                 if (IS_ERR(crtc_state)) {
1000                         ret = PTR_ERR(crtc_state);
1001                         break;
1002                 }
1003
1004                 ret = drm_atomic_crtc_set_property(crtc,
1005                                 crtc_state, prop, prop_value);
1006                 break;
1007         }
1008         case DRM_MODE_OBJECT_PLANE: {
1009                 struct drm_plane *plane = obj_to_plane(obj);
1010                 struct drm_plane_state *plane_state;
1011
1012                 plane_state = drm_atomic_get_plane_state(state, plane);
1013                 if (IS_ERR(plane_state)) {
1014                         ret = PTR_ERR(plane_state);
1015                         break;
1016                 }
1017
1018                 ret = drm_atomic_plane_set_property(plane,
1019                                 plane_state, file_priv,
1020                                 prop, prop_value);
1021                 break;
1022         }
1023         default:
1024                 ret = -EINVAL;
1025                 break;
1026         }
1027
1028         drm_property_change_valid_put(prop, ref);
1029         return ret;
1030 }
1031
1032 /**
1033  * DOC: explicit fencing properties
1034  *
1035  * Explicit fencing allows userspace to control the buffer synchronization
1036  * between devices. A Fence or a group of fences are transferred to/from
1037  * userspace using Sync File fds and there are two DRM properties for that.
1038  * IN_FENCE_FD on each DRM Plane to send fences to the kernel and
1039  * OUT_FENCE_PTR on each DRM CRTC to receive fences from the kernel.
1040  *
1041  * As a contrast, with implicit fencing the kernel keeps track of any
1042  * ongoing rendering, and automatically ensures that the atomic update waits
1043  * for any pending rendering to complete. This is usually tracked in &struct
1044  * dma_resv which can also contain mandatory kernel fences. Implicit syncing
1045  * is how Linux traditionally worked (e.g. DRI2/3 on X.org), whereas explicit
1046  * fencing is what Android wants.
1047  *
1048  * "IN_FENCE_FD”:
1049  *      Use this property to pass a fence that DRM should wait on before
1050  *      proceeding with the Atomic Commit request and show the framebuffer for
1051  *      the plane on the screen. The fence can be either a normal fence or a
1052  *      merged one, the sync_file framework will handle both cases and use a
1053  *      fence_array if a merged fence is received. Passing -1 here means no
1054  *      fences to wait on.
1055  *
1056  *      If the Atomic Commit request has the DRM_MODE_ATOMIC_TEST_ONLY flag
1057  *      it will only check if the Sync File is a valid one.
1058  *
1059  *      On the driver side the fence is stored on the @fence parameter of
1060  *      &struct drm_plane_state. Drivers which also support implicit fencing
1061  *      should extract the implicit fence using drm_gem_plane_helper_prepare_fb(),
1062  *      to make sure there's consistent behaviour between drivers in precedence
1063  *      of implicit vs. explicit fencing.
1064  *
1065  * "OUT_FENCE_PTR”:
1066  *      Use this property to pass a file descriptor pointer to DRM. Once the
1067  *      Atomic Commit request call returns OUT_FENCE_PTR will be filled with
1068  *      the file descriptor number of a Sync File. This Sync File contains the
1069  *      CRTC fence that will be signaled when all framebuffers present on the
1070  *      Atomic Commit * request for that given CRTC are scanned out on the
1071  *      screen.
1072  *
1073  *      The Atomic Commit request fails if a invalid pointer is passed. If the
1074  *      Atomic Commit request fails for any other reason the out fence fd
1075  *      returned will be -1. On a Atomic Commit with the
1076  *      DRM_MODE_ATOMIC_TEST_ONLY flag the out fence will also be set to -1.
1077  *
1078  *      Note that out-fences don't have a special interface to drivers and are
1079  *      internally represented by a &struct drm_pending_vblank_event in struct
1080  *      &drm_crtc_state, which is also used by the nonblocking atomic commit
1081  *      helpers and for the DRM event handling for existing userspace.
1082  */
1083
1084 struct drm_out_fence_state {
1085         s32 __user *out_fence_ptr;
1086         struct sync_file *sync_file;
1087         int fd;
1088 };
1089
1090 static int setup_out_fence(struct drm_out_fence_state *fence_state,
1091                            struct dma_fence *fence)
1092 {
1093         fence_state->fd = get_unused_fd_flags(O_CLOEXEC);
1094         if (fence_state->fd < 0)
1095                 return fence_state->fd;
1096
1097         if (put_user(fence_state->fd, fence_state->out_fence_ptr))
1098                 return -EFAULT;
1099
1100         fence_state->sync_file = sync_file_create(fence);
1101         if (!fence_state->sync_file)
1102                 return -ENOMEM;
1103
1104         return 0;
1105 }
1106
1107 static int prepare_signaling(struct drm_device *dev,
1108                                   struct drm_atomic_state *state,
1109                                   struct drm_mode_atomic *arg,
1110                                   struct drm_file *file_priv,
1111                                   struct drm_out_fence_state **fence_state,
1112                                   unsigned int *num_fences)
1113 {
1114         struct drm_crtc *crtc;
1115         struct drm_crtc_state *crtc_state;
1116         struct drm_connector *conn;
1117         struct drm_connector_state *conn_state;
1118         int i, c = 0, ret;
1119
1120         if (arg->flags & DRM_MODE_ATOMIC_TEST_ONLY)
1121                 return 0;
1122
1123         for_each_new_crtc_in_state(state, crtc, crtc_state, i) {
1124                 s32 __user *fence_ptr;
1125
1126                 fence_ptr = get_out_fence_for_crtc(crtc_state->state, crtc);
1127
1128                 if (arg->flags & DRM_MODE_PAGE_FLIP_EVENT || fence_ptr) {
1129                         struct drm_pending_vblank_event *e;
1130
1131                         e = create_vblank_event(crtc, arg->user_data);
1132                         if (!e)
1133                                 return -ENOMEM;
1134
1135                         crtc_state->event = e;
1136                 }
1137
1138                 if (arg->flags & DRM_MODE_PAGE_FLIP_EVENT) {
1139                         struct drm_pending_vblank_event *e = crtc_state->event;
1140
1141                         if (!file_priv)
1142                                 continue;
1143
1144                         ret = drm_event_reserve_init(dev, file_priv, &e->base,
1145                                                      &e->event.base);
1146                         if (ret) {
1147                                 kfree(e);
1148                                 crtc_state->event = NULL;
1149                                 return ret;
1150                         }
1151                 }
1152
1153                 if (fence_ptr) {
1154                         struct dma_fence *fence;
1155                         struct drm_out_fence_state *f;
1156
1157                         f = krealloc(*fence_state, sizeof(**fence_state) *
1158                                      (*num_fences + 1), GFP_KERNEL);
1159                         if (!f)
1160                                 return -ENOMEM;
1161
1162                         memset(&f[*num_fences], 0, sizeof(*f));
1163
1164                         f[*num_fences].out_fence_ptr = fence_ptr;
1165                         *fence_state = f;
1166
1167                         fence = drm_crtc_create_fence(crtc);
1168                         if (!fence)
1169                                 return -ENOMEM;
1170
1171                         ret = setup_out_fence(&f[(*num_fences)++], fence);
1172                         if (ret) {
1173                                 dma_fence_put(fence);
1174                                 return ret;
1175                         }
1176
1177                         crtc_state->event->base.fence = fence;
1178                 }
1179
1180                 c++;
1181         }
1182
1183         for_each_new_connector_in_state(state, conn, conn_state, i) {
1184                 struct drm_writeback_connector *wb_conn;
1185                 struct drm_out_fence_state *f;
1186                 struct dma_fence *fence;
1187                 s32 __user *fence_ptr;
1188
1189                 if (!conn_state->writeback_job)
1190                         continue;
1191
1192                 fence_ptr = get_out_fence_for_connector(state, conn);
1193                 if (!fence_ptr)
1194                         continue;
1195
1196                 f = krealloc(*fence_state, sizeof(**fence_state) *
1197                              (*num_fences + 1), GFP_KERNEL);
1198                 if (!f)
1199                         return -ENOMEM;
1200
1201                 memset(&f[*num_fences], 0, sizeof(*f));
1202
1203                 f[*num_fences].out_fence_ptr = fence_ptr;
1204                 *fence_state = f;
1205
1206                 wb_conn = drm_connector_to_writeback(conn);
1207                 fence = drm_writeback_get_out_fence(wb_conn);
1208                 if (!fence)
1209                         return -ENOMEM;
1210
1211                 ret = setup_out_fence(&f[(*num_fences)++], fence);
1212                 if (ret) {
1213                         dma_fence_put(fence);
1214                         return ret;
1215                 }
1216
1217                 conn_state->writeback_job->out_fence = fence;
1218         }
1219
1220         /*
1221          * Having this flag means user mode pends on event which will never
1222          * reach due to lack of at least one CRTC for signaling
1223          */
1224         if (c == 0 && (arg->flags & DRM_MODE_PAGE_FLIP_EVENT))
1225                 return -EINVAL;
1226
1227         return 0;
1228 }
1229
1230 static void complete_signaling(struct drm_device *dev,
1231                                struct drm_atomic_state *state,
1232                                struct drm_out_fence_state *fence_state,
1233                                unsigned int num_fences,
1234                                bool install_fds)
1235 {
1236         struct drm_crtc *crtc;
1237         struct drm_crtc_state *crtc_state;
1238         int i;
1239
1240         if (install_fds) {
1241                 for (i = 0; i < num_fences; i++)
1242                         fd_install(fence_state[i].fd,
1243                                    fence_state[i].sync_file->file);
1244
1245                 kfree(fence_state);
1246                 return;
1247         }
1248
1249         for_each_new_crtc_in_state(state, crtc, crtc_state, i) {
1250                 struct drm_pending_vblank_event *event = crtc_state->event;
1251                 /*
1252                  * Free the allocated event. drm_atomic_helper_setup_commit
1253                  * can allocate an event too, so only free it if it's ours
1254                  * to prevent a double free in drm_atomic_state_clear.
1255                  */
1256                 if (event && (event->base.fence || event->base.file_priv)) {
1257                         drm_event_cancel_free(dev, &event->base);
1258                         crtc_state->event = NULL;
1259                 }
1260         }
1261
1262         if (!fence_state)
1263                 return;
1264
1265         for (i = 0; i < num_fences; i++) {
1266                 if (fence_state[i].sync_file)
1267                         fput(fence_state[i].sync_file->file);
1268                 if (fence_state[i].fd >= 0)
1269                         put_unused_fd(fence_state[i].fd);
1270
1271                 /* If this fails log error to the user */
1272                 if (fence_state[i].out_fence_ptr &&
1273                     put_user(-1, fence_state[i].out_fence_ptr))
1274                         drm_dbg_atomic(dev, "Couldn't clear out_fence_ptr\n");
1275         }
1276
1277         kfree(fence_state);
1278 }
1279
1280 int drm_mode_atomic_ioctl(struct drm_device *dev,
1281                           void *data, struct drm_file *file_priv)
1282 {
1283         struct drm_mode_atomic *arg = data;
1284         uint32_t __user *objs_ptr = (uint32_t __user *)(unsigned long)(arg->objs_ptr);
1285         uint32_t __user *count_props_ptr = (uint32_t __user *)(unsigned long)(arg->count_props_ptr);
1286         uint32_t __user *props_ptr = (uint32_t __user *)(unsigned long)(arg->props_ptr);
1287         uint64_t __user *prop_values_ptr = (uint64_t __user *)(unsigned long)(arg->prop_values_ptr);
1288         unsigned int copied_objs, copied_props;
1289         struct drm_atomic_state *state;
1290         struct drm_modeset_acquire_ctx ctx;
1291         struct drm_out_fence_state *fence_state;
1292         int ret = 0;
1293         unsigned int i, j, num_fences;
1294
1295         /* disallow for drivers not supporting atomic: */
1296         if (!drm_core_check_feature(dev, DRIVER_ATOMIC))
1297                 return -EOPNOTSUPP;
1298
1299         /* disallow for userspace that has not enabled atomic cap (even
1300          * though this may be a bit overkill, since legacy userspace
1301          * wouldn't know how to call this ioctl)
1302          */
1303         if (!file_priv->atomic) {
1304                 drm_dbg_atomic(dev,
1305                                "commit failed: atomic cap not enabled\n");
1306                 return -EINVAL;
1307         }
1308
1309         if (arg->flags & ~DRM_MODE_ATOMIC_FLAGS) {
1310                 drm_dbg_atomic(dev, "commit failed: invalid flag\n");
1311                 return -EINVAL;
1312         }
1313
1314         if (arg->reserved) {
1315                 drm_dbg_atomic(dev, "commit failed: reserved field set\n");
1316                 return -EINVAL;
1317         }
1318
1319         if (arg->flags & DRM_MODE_PAGE_FLIP_ASYNC) {
1320                 drm_dbg_atomic(dev,
1321                                "commit failed: invalid flag DRM_MODE_PAGE_FLIP_ASYNC\n");
1322                 return -EINVAL;
1323         }
1324
1325         /* can't test and expect an event at the same time. */
1326         if ((arg->flags & DRM_MODE_ATOMIC_TEST_ONLY) &&
1327                         (arg->flags & DRM_MODE_PAGE_FLIP_EVENT)) {
1328                 drm_dbg_atomic(dev,
1329                                "commit failed: page-flip event requested with test-only commit\n");
1330                 return -EINVAL;
1331         }
1332
1333         state = drm_atomic_state_alloc(dev);
1334         if (!state)
1335                 return -ENOMEM;
1336
1337         drm_modeset_acquire_init(&ctx, DRM_MODESET_ACQUIRE_INTERRUPTIBLE);
1338         state->acquire_ctx = &ctx;
1339         state->allow_modeset = !!(arg->flags & DRM_MODE_ATOMIC_ALLOW_MODESET);
1340
1341 retry:
1342         copied_objs = 0;
1343         copied_props = 0;
1344         fence_state = NULL;
1345         num_fences = 0;
1346
1347         for (i = 0; i < arg->count_objs; i++) {
1348                 uint32_t obj_id, count_props;
1349                 struct drm_mode_object *obj;
1350
1351                 if (get_user(obj_id, objs_ptr + copied_objs)) {
1352                         ret = -EFAULT;
1353                         goto out;
1354                 }
1355
1356                 obj = drm_mode_object_find(dev, file_priv, obj_id, DRM_MODE_OBJECT_ANY);
1357                 if (!obj) {
1358                         ret = -ENOENT;
1359                         goto out;
1360                 }
1361
1362                 if (!obj->properties) {
1363                         drm_mode_object_put(obj);
1364                         ret = -ENOENT;
1365                         goto out;
1366                 }
1367
1368                 if (get_user(count_props, count_props_ptr + copied_objs)) {
1369                         drm_mode_object_put(obj);
1370                         ret = -EFAULT;
1371                         goto out;
1372                 }
1373
1374                 copied_objs++;
1375
1376                 for (j = 0; j < count_props; j++) {
1377                         uint32_t prop_id;
1378                         uint64_t prop_value;
1379                         struct drm_property *prop;
1380
1381                         if (get_user(prop_id, props_ptr + copied_props)) {
1382                                 drm_mode_object_put(obj);
1383                                 ret = -EFAULT;
1384                                 goto out;
1385                         }
1386
1387                         prop = drm_mode_obj_find_prop_id(obj, prop_id);
1388                         if (!prop) {
1389                                 drm_mode_object_put(obj);
1390                                 ret = -ENOENT;
1391                                 goto out;
1392                         }
1393
1394                         if (copy_from_user(&prop_value,
1395                                            prop_values_ptr + copied_props,
1396                                            sizeof(prop_value))) {
1397                                 drm_mode_object_put(obj);
1398                                 ret = -EFAULT;
1399                                 goto out;
1400                         }
1401
1402                         ret = drm_atomic_set_property(state, file_priv,
1403                                                       obj, prop, prop_value);
1404                         if (ret) {
1405                                 drm_mode_object_put(obj);
1406                                 goto out;
1407                         }
1408
1409                         copied_props++;
1410                 }
1411
1412                 drm_mode_object_put(obj);
1413         }
1414
1415         ret = prepare_signaling(dev, state, arg, file_priv, &fence_state,
1416                                 &num_fences);
1417         if (ret)
1418                 goto out;
1419
1420         if (arg->flags & DRM_MODE_ATOMIC_TEST_ONLY) {
1421                 ret = drm_atomic_check_only(state);
1422         } else if (arg->flags & DRM_MODE_ATOMIC_NONBLOCK) {
1423                 ret = drm_atomic_nonblocking_commit(state);
1424         } else {
1425                 ret = drm_atomic_commit(state);
1426         }
1427
1428 out:
1429         complete_signaling(dev, state, fence_state, num_fences, !ret);
1430
1431         if (ret == -EDEADLK) {
1432                 drm_atomic_state_clear(state);
1433                 ret = drm_modeset_backoff(&ctx);
1434                 if (!ret)
1435                         goto retry;
1436         }
1437
1438         drm_atomic_state_put(state);
1439
1440         drm_modeset_drop_locks(&ctx);
1441         drm_modeset_acquire_fini(&ctx);
1442
1443         return ret;
1444 }