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 it's form: 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->degamma_lut_property) {
 437                 ret = drm_atomic_replace_property_blob_from_id(dev,
 438                                         &state->degamma_lut,
 439                                         val,
 440                                         -1, sizeof(struct drm_color_lut),
 441                                         &replaced);
 442                 state->color_mgmt_changed |= replaced;
 443                 return ret;
 444         } else if (property == config->ctm_property) {
 445                 ret = drm_atomic_replace_property_blob_from_id(dev,
 446                                         &state->ctm,
 447                                         val,
 448                                         sizeof(struct drm_color_ctm), -1,
 449                                         &replaced);
 450                 state->color_mgmt_changed |= replaced;
 451                 return ret;
 452         } else if (property == config->gamma_lut_property) {
 453                 ret = drm_atomic_replace_property_blob_from_id(dev,
 454                                         &state->gamma_lut,
 455                                         val,
 456                                         -1, sizeof(struct drm_color_lut),
 457                                         &replaced);
 458                 state->color_mgmt_changed |= replaced;
 459                 return ret;
 460         } else if (property == config->prop_out_fence_ptr) {
 461                 s32 __user *fence_ptr = u64_to_user_ptr(val);
 462
 463                 if (!fence_ptr)
 464                         return 0;
 465
 466                 if (put_user(-1, fence_ptr))
 467                         return -EFAULT;
 468
 469                 set_out_fence_for_crtc(state->state, crtc, fence_ptr);
 470         } else if (crtc->funcs->atomic_set_property) {
 471                 return crtc->funcs->atomic_set_property(crtc, state, property, val);
 472         } else {
 473                 DRM_DEBUG_ATOMIC("[CRTC:%d:%s] unknown property [PROP:%d:%s]]\n",
 474                                  crtc->base.id, crtc->name,
 475                                  property->base.id, property->name);
 476                 return -EINVAL;
 477         }
 478
 479         return 0;
 480 }
 481
 482 static int
 483 drm_atomic_crtc_get_property(struct drm_crtc *crtc,
 484                 const struct drm_crtc_state *state,
 485                 struct drm_property *property, uint64_t *val)
 486 {
 487         struct drm_device *dev = crtc->dev;
 488         struct drm_mode_config *config = &dev->mode_config;
 489
 490         if (property == config->prop_active)
 491                 *val = state->active;
 492         else if (property == config->prop_mode_id)
 493                 *val = (state->mode_blob) ? state->mode_blob->base.id : 0;
 494         else if (property == config->degamma_lut_property)
 495                 *val = (state->degamma_lut) ? state->degamma_lut->base.id : 0;
 496         else if (property == config->ctm_property)
 497                 *val = (state->ctm) ? state->ctm->base.id : 0;
 498         else if (property == config->gamma_lut_property)
 499                 *val = (state->gamma_lut) ? state->gamma_lut->base.id : 0;
 500         else if (property == config->prop_out_fence_ptr)
 501                 *val = 0;
 502         else if (crtc->funcs->atomic_get_property)
 503                 return crtc->funcs->atomic_get_property(crtc, state, property, val);
 504         else
 505                 return -EINVAL;
 506
 507         return 0;
 508 }
 509
 510 static int drm_atomic_plane_set_property(struct drm_plane *plane,
 511                 struct drm_plane_state *state, struct drm_property *property,
 512                 uint64_t val)
 513 {
 514         struct drm_device *dev = plane->dev;
 515         struct drm_mode_config *config = &dev->mode_config;
 516
 517         if (property == config->prop_fb_id) {
 518                 struct drm_framebuffer *fb = drm_framebuffer_lookup(dev, NULL, val);
 519                 drm_atomic_set_fb_for_plane(state, fb);
 520                 if (fb)
 521                         drm_framebuffer_put(fb);
 522         } else if (property == config->prop_in_fence_fd) {
 523                 if (state->fence)
 524                         return -EINVAL;
 525
 526                 if (U642I64(val) == -1)
 527                         return 0;
 528
 529                 state->fence = sync_file_get_fence(val);
 530                 if (!state->fence)
 531                         return -EINVAL;
 532
 533         } else if (property == config->prop_crtc_id) {
 534                 struct drm_crtc *crtc = drm_crtc_find(dev, NULL, val);
 535                 return drm_atomic_set_crtc_for_plane(state, crtc);
 536         } else if (property == config->prop_crtc_x) {
 537                 state->crtc_x = U642I64(val);
 538         } else if (property == config->prop_crtc_y) {
 539                 state->crtc_y = U642I64(val);
 540         } else if (property == config->prop_crtc_w) {
 541                 state->crtc_w = val;
 542         } else if (property == config->prop_crtc_h) {
 543                 state->crtc_h = val;
 544         } else if (property == config->prop_src_x) {
 545                 state->src_x = val;
 546         } else if (property == config->prop_src_y) {
 547                 state->src_y = val;
 548         } else if (property == config->prop_src_w) {
 549                 state->src_w = val;
 550         } else if (property == config->prop_src_h) {
 551                 state->src_h = val;
 552         } else if (property == plane->alpha_property) {
 553                 state->alpha = val;
 554         } else if (property == plane->blend_mode_property) {
 555                 state->pixel_blend_mode = val;
 556         } else if (property == plane->rotation_property) {
 557                 if (!is_power_of_2(val & DRM_MODE_ROTATE_MASK)) {
 558                         DRM_DEBUG_ATOMIC("[PLANE:%d:%s] bad rotation bitmask: 0x%llx\n",
 559                                          plane->base.id, plane->name, val);
 560                         return -EINVAL;
 561                 }
 562                 state->rotation = val;
 563         } else if (property == plane->zpos_property) {
 564                 state->zpos = val;
 565         } else if (property == plane->color_encoding_property) {
 566                 state->color_encoding = val;
 567         } else if (property == plane->color_range_property) {
 568                 state->color_range = val;
 569         } else if (plane->funcs->atomic_set_property) {
 570                 return plane->funcs->atomic_set_property(plane, state,
 571                                 property, val);
 572         } else {
 573                 DRM_DEBUG_ATOMIC("[PLANE:%d:%s] unknown property [PROP:%d:%s]]\n",
 574                                  plane->base.id, plane->name,
 575                                  property->base.id, property->name);
 576                 return -EINVAL;
 577         }
 578
 579         return 0;
 580 }
 581
 582 static int
 583 drm_atomic_plane_get_property(struct drm_plane *plane,
 584                 const struct drm_plane_state *state,
 585                 struct drm_property *property, uint64_t *val)
 586 {
 587         struct drm_device *dev = plane->dev;
 588         struct drm_mode_config *config = &dev->mode_config;
 589
 590         if (property == config->prop_fb_id) {
 591                 *val = (state->fb) ? state->fb->base.id : 0;
 592         } else if (property == config->prop_in_fence_fd) {
 593                 *val = -1;
 594         } else if (property == config->prop_crtc_id) {
 595                 *val = (state->crtc) ? state->crtc->base.id : 0;
 596         } else if (property == config->prop_crtc_x) {
 597                 *val = I642U64(state->crtc_x);
 598         } else if (property == config->prop_crtc_y) {
 599                 *val = I642U64(state->crtc_y);
 600         } else if (property == config->prop_crtc_w) {
 601                 *val = state->crtc_w;
 602         } else if (property == config->prop_crtc_h) {
 603                 *val = state->crtc_h;
 604         } else if (property == config->prop_src_x) {
 605                 *val = state->src_x;
 606         } else if (property == config->prop_src_y) {
 607                 *val = state->src_y;
 608         } else if (property == config->prop_src_w) {
 609                 *val = state->src_w;
 610         } else if (property == config->prop_src_h) {
 611                 *val = state->src_h;
 612         } else if (property == plane->alpha_property) {
 613                 *val = state->alpha;
 614         } else if (property == plane->blend_mode_property) {
 615                 *val = state->pixel_blend_mode;
 616         } else if (property == plane->rotation_property) {
 617                 *val = state->rotation;
 618         } else if (property == plane->zpos_property) {
 619                 *val = state->zpos;
 620         } else if (property == plane->color_encoding_property) {
 621                 *val = state->color_encoding;
 622         } else if (property == plane->color_range_property) {
 623                 *val = state->color_range;
 624         } else if (plane->funcs->atomic_get_property) {
 625                 return plane->funcs->atomic_get_property(plane, state, property, val);
 626         } else {
 627                 return -EINVAL;
 628         }
 629
 630         return 0;
 631 }
 632
 633 static struct drm_writeback_job *
 634 drm_atomic_get_writeback_job(struct drm_connector_state *conn_state)
 635 {
 636         WARN_ON(conn_state->connector->connector_type != DRM_MODE_CONNECTOR_WRITEBACK);
 637
 638         if (!conn_state->writeback_job)
 639                 conn_state->writeback_job =
 640                         kzalloc(sizeof(*conn_state->writeback_job), GFP_KERNEL);
 641
 642         return conn_state->writeback_job;
 643 }
 644
 645 static int drm_atomic_set_writeback_fb_for_connector(
 646                 struct drm_connector_state *conn_state,
 647                 struct drm_framebuffer *fb)
 648 {
 649         struct drm_writeback_job *job =
 650                 drm_atomic_get_writeback_job(conn_state);
 651         if (!job)
 652                 return -ENOMEM;
 653
 654         drm_framebuffer_assign(&job->fb, fb);
 655
 656         if (fb)
 657                 DRM_DEBUG_ATOMIC("Set [FB:%d] for connector state %p\n",
 658                                  fb->base.id, conn_state);
 659         else
 660                 DRM_DEBUG_ATOMIC("Set [NOFB] for connector state %p\n",
 661                                  conn_state);
 662
 663         return 0;
 664 }
 665
 666 static int drm_atomic_connector_set_property(struct drm_connector *connector,
 667                 struct drm_connector_state *state, struct drm_property *property,
 668                 uint64_t val)
 669 {
 670         struct drm_device *dev = connector->dev;
 671         struct drm_mode_config *config = &dev->mode_config;
 672
 673         if (property == config->prop_crtc_id) {
 674                 struct drm_crtc *crtc = drm_crtc_find(dev, NULL, val);
 675                 return drm_atomic_set_crtc_for_connector(state, crtc);
 676         } else if (property == config->dpms_property) {
 677                 /* setting DPMS property requires special handling, which
 678                  * is done in legacy setprop path for us.  Disallow (for
 679                  * now?) atomic writes to DPMS property:
 680                  */
 681                 return -EINVAL;
 682         } else if (property == config->tv_select_subconnector_property) {
 683                 state->tv.subconnector = val;
 684         } else if (property == config->tv_left_margin_property) {
 685                 state->tv.margins.left = val;
 686         } else if (property == config->tv_right_margin_property) {
 687                 state->tv.margins.right = val;
 688         } else if (property == config->tv_top_margin_property) {
 689                 state->tv.margins.top = val;
 690         } else if (property == config->tv_bottom_margin_property) {
 691                 state->tv.margins.bottom = val;
 692         } else if (property == config->tv_mode_property) {
 693                 state->tv.mode = val;
 694         } else if (property == config->tv_brightness_property) {
 695                 state->tv.brightness = val;
 696         } else if (property == config->tv_contrast_property) {
 697                 state->tv.contrast = val;
 698         } else if (property == config->tv_flicker_reduction_property) {
 699                 state->tv.flicker_reduction = val;
 700         } else if (property == config->tv_overscan_property) {
 701                 state->tv.overscan = val;
 702         } else if (property == config->tv_saturation_property) {
 703                 state->tv.saturation = val;
 704         } else if (property == config->tv_hue_property) {
 705                 state->tv.hue = val;
 706         } else if (property == config->link_status_property) {
 707                 /* Never downgrade from GOOD to BAD on userspace's request here,
 708                  * only hw issues can do that.
 709                  *
 710                  * For an atomic property the userspace doesn't need to be able
 711                  * to understand all the properties, but needs to be able to
 712                  * restore the state it wants on VT switch. So if the userspace
 713                  * tries to change the link_status from GOOD to BAD, driver
 714                  * silently rejects it and returns a 0. This prevents userspace
 715                  * from accidently breaking  the display when it restores the
 716                  * state.
 717                  */
 718                 if (state->link_status != DRM_LINK_STATUS_GOOD)
 719                         state->link_status = val;
 720         } else if (property == config->aspect_ratio_property) {
 721                 state->picture_aspect_ratio = val;
 722         } else if (property == config->content_type_property) {
 723                 state->content_type = val;
 724         } else if (property == connector->scaling_mode_property) {
 725                 state->scaling_mode = val;
 726         } else if (property == connector->content_protection_property) {
 727                 if (val == DRM_MODE_CONTENT_PROTECTION_ENABLED) {
 728                         DRM_DEBUG_KMS("only drivers can set CP Enabled\n");
 729                         return -EINVAL;
 730                 }
 731                 state->content_protection = val;
 732         } else if (property == config->writeback_fb_id_property) {
 733                 struct drm_framebuffer *fb = drm_framebuffer_lookup(dev, NULL, val);
 734                 int ret = drm_atomic_set_writeback_fb_for_connector(state, fb);
 735                 if (fb)
 736                         drm_framebuffer_put(fb);
 737                 return ret;
 738         } else if (property == config->writeback_out_fence_ptr_property) {
 739                 s32 __user *fence_ptr = u64_to_user_ptr(val);
 740
 741                 return set_out_fence_for_connector(state->state, connector,
 742                                                    fence_ptr);
 743         } else if (connector->funcs->atomic_set_property) {
 744                 return connector->funcs->atomic_set_property(connector,
 745                                 state, property, val);
 746         } else {
 747                 DRM_DEBUG_ATOMIC("[CONNECTOR:%d:%s] unknown property [PROP:%d:%s]]\n",
 748                                  connector->base.id, connector->name,
 749                                  property->base.id, property->name);
 750                 return -EINVAL;
 751         }
 752
 753         return 0;
 754 }
 755
 756 static int
 757 drm_atomic_connector_get_property(struct drm_connector *connector,
 758                 const struct drm_connector_state *state,
 759                 struct drm_property *property, uint64_t *val)
 760 {
 761         struct drm_device *dev = connector->dev;
 762         struct drm_mode_config *config = &dev->mode_config;
 763
 764         if (property == config->prop_crtc_id) {
 765                 *val = (state->crtc) ? state->crtc->base.id : 0;
 766         } else if (property == config->dpms_property) {
 767                 *val = connector->dpms;
 768         } else if (property == config->tv_select_subconnector_property) {
 769                 *val = state->tv.subconnector;
 770         } else if (property == config->tv_left_margin_property) {
 771                 *val = state->tv.margins.left;
 772         } else if (property == config->tv_right_margin_property) {
 773                 *val = state->tv.margins.right;
 774         } else if (property == config->tv_top_margin_property) {
 775                 *val = state->tv.margins.top;
 776         } else if (property == config->tv_bottom_margin_property) {
 777                 *val = state->tv.margins.bottom;
 778         } else if (property == config->tv_mode_property) {
 779                 *val = state->tv.mode;
 780         } else if (property == config->tv_brightness_property) {
 781                 *val = state->tv.brightness;
 782         } else if (property == config->tv_contrast_property) {
 783                 *val = state->tv.contrast;
 784         } else if (property == config->tv_flicker_reduction_property) {
 785                 *val = state->tv.flicker_reduction;
 786         } else if (property == config->tv_overscan_property) {
 787                 *val = state->tv.overscan;
 788         } else if (property == config->tv_saturation_property) {
 789                 *val = state->tv.saturation;
 790         } else if (property == config->tv_hue_property) {
 791                 *val = state->tv.hue;
 792         } else if (property == config->link_status_property) {
 793                 *val = state->link_status;
 794         } else if (property == config->aspect_ratio_property) {
 795                 *val = state->picture_aspect_ratio;
 796         } else if (property == config->content_type_property) {
 797                 *val = state->content_type;
 798         } else if (property == connector->scaling_mode_property) {
 799                 *val = state->scaling_mode;
 800         } else if (property == connector->content_protection_property) {
 801                 *val = state->content_protection;
 802         } else if (property == config->writeback_fb_id_property) {
 803                 /* Writeback framebuffer is one-shot, write and forget */
 804                 *val = 0;
 805         } else if (property == config->writeback_out_fence_ptr_property) {
 806                 *val = 0;
 807         } else if (connector->funcs->atomic_get_property) {
 808                 return connector->funcs->atomic_get_property(connector,
 809                                 state, property, val);
 810         } else {
 811                 return -EINVAL;
 812         }
 813
 814         return 0;
 815 }
 816
 817 int drm_atomic_get_property(struct drm_mode_object *obj,
 818                 struct drm_property *property, uint64_t *val)
 819 {
 820         struct drm_device *dev = property->dev;
 821         int ret;
 822
 823         switch (obj->type) {
 824         case DRM_MODE_OBJECT_CONNECTOR: {
 825                 struct drm_connector *connector = obj_to_connector(obj);
 826                 WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
 827                 ret = drm_atomic_connector_get_property(connector,
 828                                 connector->state, property, val);
 829                 break;
 830         }
 831         case DRM_MODE_OBJECT_CRTC: {
 832                 struct drm_crtc *crtc = obj_to_crtc(obj);
 833                 WARN_ON(!drm_modeset_is_locked(&crtc->mutex));
 834                 ret = drm_atomic_crtc_get_property(crtc,
 835                                 crtc->state, property, val);
 836                 break;
 837         }
 838         case DRM_MODE_OBJECT_PLANE: {
 839                 struct drm_plane *plane = obj_to_plane(obj);
 840                 WARN_ON(!drm_modeset_is_locked(&plane->mutex));
 841                 ret = drm_atomic_plane_get_property(plane,
 842                                 plane->state, property, val);
 843                 break;
 844         }
 845         default:
 846                 ret = -EINVAL;
 847                 break;
 848         }
 849
 850         return ret;
 851 }
 852
 853 /*
 854  * The big monster ioctl
 855  */
 856
 857 static struct drm_pending_vblank_event *create_vblank_event(
 858                 struct drm_crtc *crtc, uint64_t user_data)
 859 {
 860         struct drm_pending_vblank_event *e = NULL;
 861
 862         e = kzalloc(sizeof *e, GFP_KERNEL);
 863         if (!e)
 864                 return NULL;
 865
 866         e->event.base.type = DRM_EVENT_FLIP_COMPLETE;
 867         e->event.base.length = sizeof(e->event);
 868         e->event.vbl.crtc_id = crtc->base.id;
 869         e->event.vbl.user_data = user_data;
 870
 871         return e;
 872 }
 873
 874 int drm_atomic_connector_commit_dpms(struct drm_atomic_state *state,
 875                                      struct drm_connector *connector,
 876                                      int mode)
 877 {
 878         struct drm_connector *tmp_connector;
 879         struct drm_connector_state *new_conn_state;
 880         struct drm_crtc *crtc;
 881         struct drm_crtc_state *crtc_state;
 882         int i, ret, old_mode = connector->dpms;
 883         bool active = false;
 884
 885         ret = drm_modeset_lock(&state->dev->mode_config.connection_mutex,
 886                                state->acquire_ctx);
 887         if (ret)
 888                 return ret;
 889
 890         if (mode != DRM_MODE_DPMS_ON)
 891                 mode = DRM_MODE_DPMS_OFF;
 892         connector->dpms = mode;
 893
 894         crtc = connector->state->crtc;
 895         if (!crtc)
 896                 goto out;
 897         ret = drm_atomic_add_affected_connectors(state, crtc);
 898         if (ret)
 899                 goto out;
 900
 901         crtc_state = drm_atomic_get_crtc_state(state, crtc);
 902         if (IS_ERR(crtc_state)) {
 903                 ret = PTR_ERR(crtc_state);
 904                 goto out;
 905         }
 906
 907         for_each_new_connector_in_state(state, tmp_connector, new_conn_state, i) {
 908                 if (new_conn_state->crtc != crtc)
 909                         continue;
 910                 if (tmp_connector->dpms == DRM_MODE_DPMS_ON) {
 911                         active = true;
 912                         break;
 913                 }
 914         }
 915
 916         crtc_state->active = active;
 917         ret = drm_atomic_commit(state);
 918 out:
 919         if (ret != 0)
 920                 connector->dpms = old_mode;
 921         return ret;
 922 }
 923
 924 int drm_atomic_set_property(struct drm_atomic_state *state,
 925                             struct drm_mode_object *obj,
 926                             struct drm_property *prop,
 927                             uint64_t prop_value)
 928 {
 929         struct drm_mode_object *ref;
 930         int ret;
 931
 932         if (!drm_property_change_valid_get(prop, prop_value, &ref))
 933                 return -EINVAL;
 934
 935         switch (obj->type) {
 936         case DRM_MODE_OBJECT_CONNECTOR: {
 937                 struct drm_connector *connector = obj_to_connector(obj);
 938                 struct drm_connector_state *connector_state;
 939
 940                 connector_state = drm_atomic_get_connector_state(state, connector);
 941                 if (IS_ERR(connector_state)) {
 942                         ret = PTR_ERR(connector_state);
 943                         break;
 944                 }
 945
 946                 ret = drm_atomic_connector_set_property(connector,
 947                                 connector_state, prop, prop_value);
 948                 break;
 949         }
 950         case DRM_MODE_OBJECT_CRTC: {
 951                 struct drm_crtc *crtc = obj_to_crtc(obj);
 952                 struct drm_crtc_state *crtc_state;
 953
 954                 crtc_state = drm_atomic_get_crtc_state(state, crtc);
 955                 if (IS_ERR(crtc_state)) {
 956                         ret = PTR_ERR(crtc_state);
 957                         break;
 958                 }
 959
 960                 ret = drm_atomic_crtc_set_property(crtc,
 961                                 crtc_state, prop, prop_value);
 962                 break;
 963         }
 964         case DRM_MODE_OBJECT_PLANE: {
 965                 struct drm_plane *plane = obj_to_plane(obj);
 966                 struct drm_plane_state *plane_state;
 967
 968                 plane_state = drm_atomic_get_plane_state(state, plane);
 969                 if (IS_ERR(plane_state)) {
 970                         ret = PTR_ERR(plane_state);
 971                         break;
 972                 }
 973
 974                 ret = drm_atomic_plane_set_property(plane,
 975                                 plane_state, prop, prop_value);
 976                 break;
 977         }
 978         default:
 979                 ret = -EINVAL;
 980                 break;
 981         }
 982
 983         drm_property_change_valid_put(prop, ref);
 984         return ret;
 985 }
 986
 987 /**
 988  * DOC: explicit fencing properties
 989  *
 990  * Explicit fencing allows userspace to control the buffer synchronization
 991  * between devices. A Fence or a group of fences are transfered to/from
 992  * userspace using Sync File fds and there are two DRM properties for that.
 993  * IN_FENCE_FD on each DRM Plane to send fences to the kernel and
 994  * OUT_FENCE_PTR on each DRM CRTC to receive fences from the kernel.
 995  *
 996  * As a contrast, with implicit fencing the kernel keeps track of any
 997  * ongoing rendering, and automatically ensures that the atomic update waits
 998  * for any pending rendering to complete. For shared buffers represented with
 999  * a &struct dma_buf this is tracked in &struct reservation_object.
1000  * Implicit syncing is how Linux traditionally worked (e.g. DRI2/3 on X.org),
1001  * whereas explicit fencing is what Android wants.
1002  *
1003  * "IN_FENCE_FD”:
1004  *      Use this property to pass a fence that DRM should wait on before
1005  *      proceeding with the Atomic Commit request and show the framebuffer for
1006  *      the plane on the screen. The fence can be either a normal fence or a
1007  *      merged one, the sync_file framework will handle both cases and use a
1008  *      fence_array if a merged fence is received. Passing -1 here means no
1009  *      fences to wait on.
1010  *
1011  *      If the Atomic Commit request has the DRM_MODE_ATOMIC_TEST_ONLY flag
1012  *      it will only check if the Sync File is a valid one.
1013  *
1014  *      On the driver side the fence is stored on the @fence parameter of
1015  *      &struct drm_plane_state. Drivers which also support implicit fencing
1016  *      should set the implicit fence using drm_atomic_set_fence_for_plane(),
1017  *      to make sure there's consistent behaviour between drivers in precedence
1018  *      of implicit vs. explicit fencing.
1019  *
1020  * "OUT_FENCE_PTR”:
1021  *      Use this property to pass a file descriptor pointer to DRM. Once the
1022  *      Atomic Commit request call returns OUT_FENCE_PTR will be filled with
1023  *      the file descriptor number of a Sync File. This Sync File contains the
1024  *      CRTC fence that will be signaled when all framebuffers present on the
1025  *      Atomic Commit * request for that given CRTC are scanned out on the
1026  *      screen.
1027  *
1028  *      The Atomic Commit request fails if a invalid pointer is passed. If the
1029  *      Atomic Commit request fails for any other reason the out fence fd
1030  *      returned will be -1. On a Atomic Commit with the
1031  *      DRM_MODE_ATOMIC_TEST_ONLY flag the out fence will also be set to -1.
1032  *
1033  *      Note that out-fences don't have a special interface to drivers and are
1034  *      internally represented by a &struct drm_pending_vblank_event in struct
1035  *      &drm_crtc_state, which is also used by the nonblocking atomic commit
1036  *      helpers and for the DRM event handling for existing userspace.
1037  */
1038
1039 struct drm_out_fence_state {
1040         s32 __user *out_fence_ptr;
1041         struct sync_file *sync_file;
1042         int fd;
1043 };
1044
1045 static int setup_out_fence(struct drm_out_fence_state *fence_state,
1046                            struct dma_fence *fence)
1047 {
1048         fence_state->fd = get_unused_fd_flags(O_CLOEXEC);
1049         if (fence_state->fd < 0)
1050                 return fence_state->fd;
1051
1052         if (put_user(fence_state->fd, fence_state->out_fence_ptr))
1053                 return -EFAULT;
1054
1055         fence_state->sync_file = sync_file_create(fence);
1056         if (!fence_state->sync_file)
1057                 return -ENOMEM;
1058
1059         return 0;
1060 }
1061
1062 static int prepare_signaling(struct drm_device *dev,
1063                                   struct drm_atomic_state *state,
1064                                   struct drm_mode_atomic *arg,
1065                                   struct drm_file *file_priv,
1066                                   struct drm_out_fence_state **fence_state,
1067                                   unsigned int *num_fences)
1068 {
1069         struct drm_crtc *crtc;
1070         struct drm_crtc_state *crtc_state;
1071         struct drm_connector *conn;
1072         struct drm_connector_state *conn_state;
1073         int i, c = 0, ret;
1074
1075         if (arg->flags & DRM_MODE_ATOMIC_TEST_ONLY)
1076                 return 0;
1077
1078         for_each_new_crtc_in_state(state, crtc, crtc_state, i) {
1079                 s32 __user *fence_ptr;
1080
1081                 fence_ptr = get_out_fence_for_crtc(crtc_state->state, crtc);
1082
1083                 if (arg->flags & DRM_MODE_PAGE_FLIP_EVENT || fence_ptr) {
1084                         struct drm_pending_vblank_event *e;
1085
1086                         e = create_vblank_event(crtc, arg->user_data);
1087                         if (!e)
1088                                 return -ENOMEM;
1089
1090                         crtc_state->event = e;
1091                 }
1092
1093                 if (arg->flags & DRM_MODE_PAGE_FLIP_EVENT) {
1094                         struct drm_pending_vblank_event *e = crtc_state->event;
1095
1096                         if (!file_priv)
1097                                 continue;
1098
1099                         ret = drm_event_reserve_init(dev, file_priv, &e->base,
1100                                                      &e->event.base);
1101                         if (ret) {
1102                                 kfree(e);
1103                                 crtc_state->event = NULL;
1104                                 return ret;
1105                         }
1106                 }
1107
1108                 if (fence_ptr) {
1109                         struct dma_fence *fence;
1110                         struct drm_out_fence_state *f;
1111
1112                         f = krealloc(*fence_state, sizeof(**fence_state) *
1113                                      (*num_fences + 1), GFP_KERNEL);
1114                         if (!f)
1115                                 return -ENOMEM;
1116
1117                         memset(&f[*num_fences], 0, sizeof(*f));
1118
1119                         f[*num_fences].out_fence_ptr = fence_ptr;
1120                         *fence_state = f;
1121
1122                         fence = drm_crtc_create_fence(crtc);
1123                         if (!fence)
1124                                 return -ENOMEM;
1125
1126                         ret = setup_out_fence(&f[(*num_fences)++], fence);
1127                         if (ret) {
1128                                 dma_fence_put(fence);
1129                                 return ret;
1130                         }
1131
1132                         crtc_state->event->base.fence = fence;
1133                 }
1134
1135                 c++;
1136         }
1137
1138         for_each_new_connector_in_state(state, conn, conn_state, i) {
1139                 struct drm_writeback_connector *wb_conn;
1140                 struct drm_writeback_job *job;
1141                 struct drm_out_fence_state *f;
1142                 struct dma_fence *fence;
1143                 s32 __user *fence_ptr;
1144
1145                 fence_ptr = get_out_fence_for_connector(state, conn);
1146                 if (!fence_ptr)
1147                         continue;
1148
1149                 job = drm_atomic_get_writeback_job(conn_state);
1150                 if (!job)
1151                         return -ENOMEM;
1152
1153                 f = krealloc(*fence_state, sizeof(**fence_state) *
1154                              (*num_fences + 1), GFP_KERNEL);
1155                 if (!f)
1156                         return -ENOMEM;
1157
1158                 memset(&f[*num_fences], 0, sizeof(*f));
1159
1160                 f[*num_fences].out_fence_ptr = fence_ptr;
1161                 *fence_state = f;
1162
1163                 wb_conn = drm_connector_to_writeback(conn);
1164                 fence = drm_writeback_get_out_fence(wb_conn);
1165                 if (!fence)
1166                         return -ENOMEM;
1167
1168                 ret = setup_out_fence(&f[(*num_fences)++], fence);
1169                 if (ret) {
1170                         dma_fence_put(fence);
1171                         return ret;
1172                 }
1173
1174                 job->out_fence = fence;
1175         }
1176
1177         /*
1178          * Having this flag means user mode pends on event which will never
1179          * reach due to lack of at least one CRTC for signaling
1180          */
1181         if (c == 0 && (arg->flags & DRM_MODE_PAGE_FLIP_EVENT))
1182                 return -EINVAL;
1183
1184         return 0;
1185 }
1186
1187 static void complete_signaling(struct drm_device *dev,
1188                                struct drm_atomic_state *state,
1189                                struct drm_out_fence_state *fence_state,
1190                                unsigned int num_fences,
1191                                bool install_fds)
1192 {
1193         struct drm_crtc *crtc;
1194         struct drm_crtc_state *crtc_state;
1195         int i;
1196
1197         if (install_fds) {
1198                 for (i = 0; i < num_fences; i++)
1199                         fd_install(fence_state[i].fd,
1200                                    fence_state[i].sync_file->file);
1201
1202                 kfree(fence_state);
1203                 return;
1204         }
1205
1206         for_each_new_crtc_in_state(state, crtc, crtc_state, i) {
1207                 struct drm_pending_vblank_event *event = crtc_state->event;
1208                 /*
1209                  * Free the allocated event. drm_atomic_helper_setup_commit
1210                  * can allocate an event too, so only free it if it's ours
1211                  * to prevent a double free in drm_atomic_state_clear.
1212                  */
1213                 if (event && (event->base.fence || event->base.file_priv)) {
1214                         drm_event_cancel_free(dev, &event->base);
1215                         crtc_state->event = NULL;
1216                 }
1217         }
1218
1219         if (!fence_state)
1220                 return;
1221
1222         for (i = 0; i < num_fences; i++) {
1223                 if (fence_state[i].sync_file)
1224                         fput(fence_state[i].sync_file->file);
1225                 if (fence_state[i].fd >= 0)
1226                         put_unused_fd(fence_state[i].fd);
1227
1228                 /* If this fails log error to the user */
1229                 if (fence_state[i].out_fence_ptr &&
1230                     put_user(-1, fence_state[i].out_fence_ptr))
1231                         DRM_DEBUG_ATOMIC("Couldn't clear out_fence_ptr\n");
1232         }
1233
1234         kfree(fence_state);
1235 }
1236
1237 int drm_mode_atomic_ioctl(struct drm_device *dev,
1238                           void *data, struct drm_file *file_priv)
1239 {
1240         struct drm_mode_atomic *arg = data;
1241         uint32_t __user *objs_ptr = (uint32_t __user *)(unsigned long)(arg->objs_ptr);
1242         uint32_t __user *count_props_ptr = (uint32_t __user *)(unsigned long)(arg->count_props_ptr);
1243         uint32_t __user *props_ptr = (uint32_t __user *)(unsigned long)(arg->props_ptr);
1244         uint64_t __user *prop_values_ptr = (uint64_t __user *)(unsigned long)(arg->prop_values_ptr);
1245         unsigned int copied_objs, copied_props;
1246         struct drm_atomic_state *state;
1247         struct drm_modeset_acquire_ctx ctx;
1248         struct drm_out_fence_state *fence_state;
1249         int ret = 0;
1250         unsigned int i, j, num_fences;
1251
1252         /* disallow for drivers not supporting atomic: */
1253         if (!drm_core_check_feature(dev, DRIVER_ATOMIC))
1254                 return -EOPNOTSUPP;
1255
1256         /* disallow for userspace that has not enabled atomic cap (even
1257          * though this may be a bit overkill, since legacy userspace
1258          * wouldn't know how to call this ioctl)
1259          */
1260         if (!file_priv->atomic)
1261                 return -EINVAL;
1262
1263         if (arg->flags & ~DRM_MODE_ATOMIC_FLAGS)
1264                 return -EINVAL;
1265
1266         if (arg->reserved)
1267                 return -EINVAL;
1268
1269         if ((arg->flags & DRM_MODE_PAGE_FLIP_ASYNC) &&
1270                         !dev->mode_config.async_page_flip)
1271                 return -EINVAL;
1272
1273         /* can't test and expect an event at the same time. */
1274         if ((arg->flags & DRM_MODE_ATOMIC_TEST_ONLY) &&
1275                         (arg->flags & DRM_MODE_PAGE_FLIP_EVENT))
1276                 return -EINVAL;
1277
1278         drm_modeset_acquire_init(&ctx, DRM_MODESET_ACQUIRE_INTERRUPTIBLE);
1279
1280         state = drm_atomic_state_alloc(dev);
1281         if (!state)
1282                 return -ENOMEM;
1283
1284         state->acquire_ctx = &ctx;
1285         state->allow_modeset = !!(arg->flags & DRM_MODE_ATOMIC_ALLOW_MODESET);
1286
1287 retry:
1288         copied_objs = 0;
1289         copied_props = 0;
1290         fence_state = NULL;
1291         num_fences = 0;
1292
1293         for (i = 0; i < arg->count_objs; i++) {
1294                 uint32_t obj_id, count_props;
1295                 struct drm_mode_object *obj;
1296
1297                 if (get_user(obj_id, objs_ptr + copied_objs)) {
1298                         ret = -EFAULT;
1299                         goto out;
1300                 }
1301
1302                 obj = drm_mode_object_find(dev, file_priv, obj_id, DRM_MODE_OBJECT_ANY);
1303                 if (!obj) {
1304                         ret = -ENOENT;
1305                         goto out;
1306                 }
1307
1308                 if (!obj->properties) {
1309                         drm_mode_object_put(obj);
1310                         ret = -ENOENT;
1311                         goto out;
1312                 }
1313
1314                 if (get_user(count_props, count_props_ptr + copied_objs)) {
1315                         drm_mode_object_put(obj);
1316                         ret = -EFAULT;
1317                         goto out;
1318                 }
1319
1320                 copied_objs++;
1321
1322                 for (j = 0; j < count_props; j++) {
1323                         uint32_t prop_id;
1324                         uint64_t prop_value;
1325                         struct drm_property *prop;
1326
1327                         if (get_user(prop_id, props_ptr + copied_props)) {
1328                                 drm_mode_object_put(obj);
1329                                 ret = -EFAULT;
1330                                 goto out;
1331                         }
1332
1333                         prop = drm_mode_obj_find_prop_id(obj, prop_id);
1334                         if (!prop) {
1335                                 drm_mode_object_put(obj);
1336                                 ret = -ENOENT;
1337                                 goto out;
1338                         }
1339
1340                         if (copy_from_user(&prop_value,
1341                                            prop_values_ptr + copied_props,
1342                                            sizeof(prop_value))) {
1343                                 drm_mode_object_put(obj);
1344                                 ret = -EFAULT;
1345                                 goto out;
1346                         }
1347
1348                         ret = drm_atomic_set_property(state, obj, prop,
1349                                                       prop_value);
1350                         if (ret) {
1351                                 drm_mode_object_put(obj);
1352                                 goto out;
1353                         }
1354
1355                         copied_props++;
1356                 }
1357
1358                 drm_mode_object_put(obj);
1359         }
1360
1361         ret = prepare_signaling(dev, state, arg, file_priv, &fence_state,
1362                                 &num_fences);
1363         if (ret)
1364                 goto out;
1365
1366         if (arg->flags & DRM_MODE_ATOMIC_TEST_ONLY) {
1367                 ret = drm_atomic_check_only(state);
1368         } else if (arg->flags & DRM_MODE_ATOMIC_NONBLOCK) {
1369                 ret = drm_atomic_nonblocking_commit(state);
1370         } else {
1371                 if (unlikely(drm_debug & DRM_UT_STATE))
1372                         drm_atomic_print_state(state);
1373
1374                 ret = drm_atomic_commit(state);
1375         }
1376
1377 out:
1378         complete_signaling(dev, state, fence_state, num_fences, !ret);
1379
1380         if (ret == -EDEADLK) {
1381                 drm_atomic_state_clear(state);
1382                 ret = drm_modeset_backoff(&ctx);
1383                 if (!ret)
1384                         goto retry;
1385         }
1386
1387         drm_atomic_state_put(state);
1388
1389         drm_modeset_drop_locks(&ctx);
1390         drm_modeset_acquire_fini(&ctx);
1391
1392         return ret;
1393 }