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