root/drivers/gpu/drm/drm_atomic.c

DEFINITIONS

1. __drm_crtc_commit_free
2. drm_atomic_state_default_release
3. drm_atomic_state_init
4. drm_atomic_state_alloc
5. drm_atomic_state_default_clear
6. drm_atomic_state_clear
7. __drm_atomic_state_free
8. drm_atomic_get_crtc_state
9. drm_atomic_crtc_check
10. drm_atomic_crtc_print_state
11. drm_atomic_connector_check
12. drm_atomic_get_plane_state
13. plane_switching_crtc
14. drm_atomic_plane_check
15. drm_atomic_plane_print_state
16. drm_atomic_private_obj_init
17. drm_atomic_private_obj_fini
18. drm_atomic_get_private_obj_state
19. drm_atomic_get_old_private_obj_state
20. drm_atomic_get_new_private_obj_state
21. drm_atomic_get_old_connector_for_encoder
22. drm_atomic_get_new_connector_for_encoder
23. drm_atomic_get_connector_state
24. drm_atomic_connector_print_state
25. drm_atomic_add_affected_connectors
26. drm_atomic_add_affected_planes
27. drm_atomic_check_only
28. drm_atomic_commit
29. drm_atomic_nonblocking_commit
30. __drm_atomic_helper_disable_plane
31. update_output_state
32. __drm_atomic_helper_set_config
33. drm_atomic_print_state
34. __drm_state_dump
35. drm_state_dump
36. drm_state_info
37. drm_atomic_debugfs_init

   1 /*
   2  * Copyright (C) 2014 Red Hat
   3  * Copyright (C) 2014 Intel Corp.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   9  * and/or sell copies of the Software, and to permit persons to whom the
  10  * Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice shall be included in
  13  * all copies or substantial portions of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  19  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  20  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  21  * OTHER DEALINGS IN THE SOFTWARE.
  22  *
  23  * Authors:
  24  * Rob Clark <robdclark@gmail.com>
  25  * Daniel Vetter <daniel.vetter@ffwll.ch>
  26  */
  27 
  28 
  29 #include <linux/sync_file.h>
  30 
  31 #include <drm/drm_atomic.h>
  32 #include <drm/drm_atomic_uapi.h>
  33 #include <drm/drm_debugfs.h>
  34 #include <drm/drm_device.h>
  35 #include <drm/drm_drv.h>
  36 #include <drm/drm_file.h>
  37 #include <drm/drm_fourcc.h>
  38 #include <drm/drm_mode.h>
  39 #include <drm/drm_print.h>
  40 #include <drm/drm_writeback.h>
  41 
  42 #include "drm_crtc_internal.h"
  43 #include "drm_internal.h"
  44 
  45 void __drm_crtc_commit_free(struct kref *kref)
  46 {
  47         struct drm_crtc_commit *commit =
  48                 container_of(kref, struct drm_crtc_commit, ref);
  49 
  50         kfree(commit);
  51 }
  52 EXPORT_SYMBOL(__drm_crtc_commit_free);
  53 
  54 /**
  55  * drm_atomic_state_default_release -
  56  * release memory initialized by drm_atomic_state_init
  57  * @state: atomic state
  58  *
  59  * Free all the memory allocated by drm_atomic_state_init.
  60  * This should only be used by drivers which are still subclassing
  61  * &drm_atomic_state and haven't switched to &drm_private_state yet.
  62  */
  63 void drm_atomic_state_default_release(struct drm_atomic_state *state)
  64 {
  65         kfree(state->connectors);
  66         kfree(state->crtcs);
  67         kfree(state->planes);
  68         kfree(state->private_objs);
  69 }
  70 EXPORT_SYMBOL(drm_atomic_state_default_release);
  71 
  72 /**
  73  * drm_atomic_state_init - init new atomic state
  74  * @dev: DRM device
  75  * @state: atomic state
  76  *
  77  * Default implementation for filling in a new atomic state.
  78  * This should only be used by drivers which are still subclassing
  79  * &drm_atomic_state and haven't switched to &drm_private_state yet.
  80  */
  81 int
  82 drm_atomic_state_init(struct drm_device *dev, struct drm_atomic_state *state)
  83 {
  84         kref_init(&state->ref);
  85 
  86         /* TODO legacy paths should maybe do a better job about
  87          * setting this appropriately?
  88          */
  89         state->allow_modeset = true;
  90 
  91         state->crtcs = kcalloc(dev->mode_config.num_crtc,
  92                                sizeof(*state->crtcs), GFP_KERNEL);
  93         if (!state->crtcs)
  94                 goto fail;
  95         state->planes = kcalloc(dev->mode_config.num_total_plane,
  96                                 sizeof(*state->planes), GFP_KERNEL);
  97         if (!state->planes)
  98                 goto fail;
  99 
 100         state->dev = dev;
 101 
 102         DRM_DEBUG_ATOMIC("Allocated atomic state %p\n", state);
 103 
 104         return 0;
 105 fail:
 106         drm_atomic_state_default_release(state);
 107         return -ENOMEM;
 108 }
 109 EXPORT_SYMBOL(drm_atomic_state_init);
 110 
 111 /**
 112  * drm_atomic_state_alloc - allocate atomic state
 113  * @dev: DRM device
 114  *
 115  * This allocates an empty atomic state to track updates.
 116  */
 117 struct drm_atomic_state *
 118 drm_atomic_state_alloc(struct drm_device *dev)
 119 {
 120         struct drm_mode_config *config = &dev->mode_config;
 121 
 122         if (!config->funcs->atomic_state_alloc) {
 123                 struct drm_atomic_state *state;
 124 
 125                 state = kzalloc(sizeof(*state), GFP_KERNEL);
 126                 if (!state)
 127                         return NULL;
 128                 if (drm_atomic_state_init(dev, state) < 0) {
 129                         kfree(state);
 130                         return NULL;
 131                 }
 132                 return state;
 133         }
 134 
 135         return config->funcs->atomic_state_alloc(dev);
 136 }
 137 EXPORT_SYMBOL(drm_atomic_state_alloc);
 138 
 139 /**
 140  * drm_atomic_state_default_clear - clear base atomic state
 141  * @state: atomic state
 142  *
 143  * Default implementation for clearing atomic state.
 144  * This should only be used by drivers which are still subclassing
 145  * &drm_atomic_state and haven't switched to &drm_private_state yet.
 146  */
 147 void drm_atomic_state_default_clear(struct drm_atomic_state *state)
 148 {
 149         struct drm_device *dev = state->dev;
 150         struct drm_mode_config *config = &dev->mode_config;
 151         int i;
 152 
 153         DRM_DEBUG_ATOMIC("Clearing atomic state %p\n", state);
 154 
 155         for (i = 0; i < state->num_connector; i++) {
 156                 struct drm_connector *connector = state->connectors[i].ptr;
 157 
 158                 if (!connector)
 159                         continue;
 160 
 161                 connector->funcs->atomic_destroy_state(connector,
 162                                                        state->connectors[i].state);
 163                 state->connectors[i].ptr = NULL;
 164                 state->connectors[i].state = NULL;
 165                 state->connectors[i].old_state = NULL;
 166                 state->connectors[i].new_state = NULL;
 167                 drm_connector_put(connector);
 168         }
 169 
 170         for (i = 0; i < config->num_crtc; i++) {
 171                 struct drm_crtc *crtc = state->crtcs[i].ptr;
 172 
 173                 if (!crtc)
 174                         continue;
 175 
 176                 crtc->funcs->atomic_destroy_state(crtc,
 177                                                   state->crtcs[i].state);
 178 
 179                 state->crtcs[i].ptr = NULL;
 180                 state->crtcs[i].state = NULL;
 181                 state->crtcs[i].old_state = NULL;
 182                 state->crtcs[i].new_state = NULL;
 183 
 184                 if (state->crtcs[i].commit) {
 185                         drm_crtc_commit_put(state->crtcs[i].commit);
 186                         state->crtcs[i].commit = NULL;
 187                 }
 188         }
 189 
 190         for (i = 0; i < config->num_total_plane; i++) {
 191                 struct drm_plane *plane = state->planes[i].ptr;
 192 
 193                 if (!plane)
 194                         continue;
 195 
 196                 plane->funcs->atomic_destroy_state(plane,
 197                                                    state->planes[i].state);
 198                 state->planes[i].ptr = NULL;
 199                 state->planes[i].state = NULL;
 200                 state->planes[i].old_state = NULL;
 201                 state->planes[i].new_state = NULL;
 202         }
 203 
 204         for (i = 0; i < state->num_private_objs; i++) {
 205                 struct drm_private_obj *obj = state->private_objs[i].ptr;
 206 
 207                 obj->funcs->atomic_destroy_state(obj,
 208                                                  state->private_objs[i].state);
 209                 state->private_objs[i].ptr = NULL;
 210                 state->private_objs[i].state = NULL;
 211                 state->private_objs[i].old_state = NULL;
 212                 state->private_objs[i].new_state = NULL;
 213         }
 214         state->num_private_objs = 0;
 215 
 216         if (state->fake_commit) {
 217                 drm_crtc_commit_put(state->fake_commit);
 218                 state->fake_commit = NULL;
 219         }
 220 }
 221 EXPORT_SYMBOL(drm_atomic_state_default_clear);
 222 
 223 /**
 224  * drm_atomic_state_clear - clear state object
 225  * @state: atomic state
 226  *
 227  * When the w/w mutex algorithm detects a deadlock we need to back off and drop
 228  * all locks. So someone else could sneak in and change the current modeset
 229  * configuration. Which means that all the state assembled in @state is no
 230  * longer an atomic update to the current state, but to some arbitrary earlier
 231  * state. Which could break assumptions the driver's
 232  * &drm_mode_config_funcs.atomic_check likely relies on.
 233  *
 234  * Hence we must clear all cached state and completely start over, using this
 235  * function.
 236  */
 237 void drm_atomic_state_clear(struct drm_atomic_state *state)
 238 {
 239         struct drm_device *dev = state->dev;
 240         struct drm_mode_config *config = &dev->mode_config;
 241 
 242         if (config->funcs->atomic_state_clear)
 243                 config->funcs->atomic_state_clear(state);
 244         else
 245                 drm_atomic_state_default_clear(state);
 246 }
 247 EXPORT_SYMBOL(drm_atomic_state_clear);
 248 
 249 /**
 250  * __drm_atomic_state_free - free all memory for an atomic state
 251  * @ref: This atomic state to deallocate
 252  *
 253  * This frees all memory associated with an atomic state, including all the
 254  * per-object state for planes, crtcs and connectors.
 255  */
 256 void __drm_atomic_state_free(struct kref *ref)
 257 {
 258         struct drm_atomic_state *state = container_of(ref, typeof(*state), ref);
 259         struct drm_mode_config *config = &state->dev->mode_config;
 260 
 261         drm_atomic_state_clear(state);
 262 
 263         DRM_DEBUG_ATOMIC("Freeing atomic state %p\n", state);
 264 
 265         if (config->funcs->atomic_state_free) {
 266                 config->funcs->atomic_state_free(state);
 267         } else {
 268                 drm_atomic_state_default_release(state);
 269                 kfree(state);
 270         }
 271 }
 272 EXPORT_SYMBOL(__drm_atomic_state_free);
 273 
 274 /**
 275  * drm_atomic_get_crtc_state - get crtc state
 276  * @state: global atomic state object
 277  * @crtc: crtc to get state object for
 278  *
 279  * This function returns the crtc state for the given crtc, allocating it if
 280  * needed. It will also grab the relevant crtc lock to make sure that the state
 281  * is consistent.
 282  *
 283  * Returns:
 284  *
 285  * Either the allocated state or the error code encoded into the pointer. When
 286  * the error is EDEADLK then the w/w mutex code has detected a deadlock and the
 287  * entire atomic sequence must be restarted. All other errors are fatal.
 288  */
 289 struct drm_crtc_state *
 290 drm_atomic_get_crtc_state(struct drm_atomic_state *state,
 291                           struct drm_crtc *crtc)
 292 {
 293         int ret, index = drm_crtc_index(crtc);
 294         struct drm_crtc_state *crtc_state;
 295 
 296         WARN_ON(!state->acquire_ctx);
 297 
 298         crtc_state = drm_atomic_get_existing_crtc_state(state, crtc);
 299         if (crtc_state)
 300                 return crtc_state;
 301 
 302         ret = drm_modeset_lock(&crtc->mutex, state->acquire_ctx);
 303         if (ret)
 304                 return ERR_PTR(ret);
 305 
 306         crtc_state = crtc->funcs->atomic_duplicate_state(crtc);
 307         if (!crtc_state)
 308                 return ERR_PTR(-ENOMEM);
 309 
 310         state->crtcs[index].state = crtc_state;
 311         state->crtcs[index].old_state = crtc->state;
 312         state->crtcs[index].new_state = crtc_state;
 313         state->crtcs[index].ptr = crtc;
 314         crtc_state->state = state;
 315 
 316         DRM_DEBUG_ATOMIC("Added [CRTC:%d:%s] %p state to %p\n",
 317                          crtc->base.id, crtc->name, crtc_state, state);
 318 
 319         return crtc_state;
 320 }
 321 EXPORT_SYMBOL(drm_atomic_get_crtc_state);
 322 
 323 static int drm_atomic_crtc_check(const struct drm_crtc_state *old_crtc_state,
 324                                  const struct drm_crtc_state *new_crtc_state)
 325 {
 326         struct drm_crtc *crtc = new_crtc_state->crtc;
 327 
 328         /* NOTE: we explicitly don't enforce constraints such as primary
 329          * layer covering entire screen, since that is something we want
 330          * to allow (on hw that supports it).  For hw that does not, it
 331          * should be checked in driver's crtc->atomic_check() vfunc.
 332          *
 333          * TODO: Add generic modeset state checks once we support those.
 334          */
 335 
 336         if (new_crtc_state->active && !new_crtc_state->enable) {
 337                 DRM_DEBUG_ATOMIC("[CRTC:%d:%s] active without enabled\n",
 338                                  crtc->base.id, crtc->name);
 339                 return -EINVAL;
 340         }
 341 
 342         /* The state->enable vs. state->mode_blob checks can be WARN_ON,
 343          * as this is a kernel-internal detail that userspace should never
 344          * be able to trigger. */
 345         if (drm_core_check_feature(crtc->dev, DRIVER_ATOMIC) &&
 346             WARN_ON(new_crtc_state->enable && !new_crtc_state->mode_blob)) {
 347                 DRM_DEBUG_ATOMIC("[CRTC:%d:%s] enabled without mode blob\n",
 348                                  crtc->base.id, crtc->name);
 349                 return -EINVAL;
 350         }
 351 
 352         if (drm_core_check_feature(crtc->dev, DRIVER_ATOMIC) &&
 353             WARN_ON(!new_crtc_state->enable && new_crtc_state->mode_blob)) {
 354                 DRM_DEBUG_ATOMIC("[CRTC:%d:%s] disabled with mode blob\n",
 355                                  crtc->base.id, crtc->name);
 356                 return -EINVAL;
 357         }
 358 
 359         /*
 360          * Reject event generation for when a CRTC is off and stays off.
 361          * It wouldn't be hard to implement this, but userspace has a track
 362          * record of happily burning through 100% cpu (or worse, crash) when the
 363          * display pipe is suspended. To avoid all that fun just reject updates
 364          * that ask for events since likely that indicates a bug in the
 365          * compositor's drawing loop. This is consistent with the vblank IOCTL
 366          * and legacy page_flip IOCTL which also reject service on a disabled
 367          * pipe.
 368          */
 369         if (new_crtc_state->event &&
 370             !new_crtc_state->active && !old_crtc_state->active) {
 371                 DRM_DEBUG_ATOMIC("[CRTC:%d:%s] requesting event but off\n",
 372                                  crtc->base.id, crtc->name);
 373                 return -EINVAL;
 374         }
 375 
 376         return 0;
 377 }
 378 
 379 static void drm_atomic_crtc_print_state(struct drm_printer *p,
 380                 const struct drm_crtc_state *state)
 381 {
 382         struct drm_crtc *crtc = state->crtc;
 383 
 384         drm_printf(p, "crtc[%u]: %s\n", crtc->base.id, crtc->name);
 385         drm_printf(p, "\tenable=%d\n", state->enable);
 386         drm_printf(p, "\tactive=%d\n", state->active);
 387         drm_printf(p, "\tself_refresh_active=%d\n", state->self_refresh_active);
 388         drm_printf(p, "\tplanes_changed=%d\n", state->planes_changed);
 389         drm_printf(p, "\tmode_changed=%d\n", state->mode_changed);
 390         drm_printf(p, "\tactive_changed=%d\n", state->active_changed);
 391         drm_printf(p, "\tconnectors_changed=%d\n", state->connectors_changed);
 392         drm_printf(p, "\tcolor_mgmt_changed=%d\n", state->color_mgmt_changed);
 393         drm_printf(p, "\tplane_mask=%x\n", state->plane_mask);
 394         drm_printf(p, "\tconnector_mask=%x\n", state->connector_mask);
 395         drm_printf(p, "\tencoder_mask=%x\n", state->encoder_mask);
 396         drm_printf(p, "\tmode: " DRM_MODE_FMT "\n", DRM_MODE_ARG(&state->mode));
 397 
 398         if (crtc->funcs->atomic_print_state)
 399                 crtc->funcs->atomic_print_state(p, state);
 400 }
 401 
 402 static int drm_atomic_connector_check(struct drm_connector *connector,
 403                 struct drm_connector_state *state)
 404 {
 405         struct drm_crtc_state *crtc_state;
 406         struct drm_writeback_job *writeback_job = state->writeback_job;
 407         const struct drm_display_info *info = &connector->display_info;
 408 
 409         state->max_bpc = info->bpc ? info->bpc : 8;
 410         if (connector->max_bpc_property)
 411                 state->max_bpc = min(state->max_bpc, state->max_requested_bpc);
 412 
 413         if ((connector->connector_type != DRM_MODE_CONNECTOR_WRITEBACK) || !writeback_job)
 414                 return 0;
 415 
 416         if (writeback_job->fb && !state->crtc) {
 417                 DRM_DEBUG_ATOMIC("[CONNECTOR:%d:%s] framebuffer without CRTC\n",
 418                                  connector->base.id, connector->name);
 419                 return -EINVAL;
 420         }
 421 
 422         if (state->crtc)
 423                 crtc_state = drm_atomic_get_existing_crtc_state(state->state,
 424                                                                 state->crtc);
 425 
 426         if (writeback_job->fb && !crtc_state->active) {
 427                 DRM_DEBUG_ATOMIC("[CONNECTOR:%d:%s] has framebuffer, but [CRTC:%d] is off\n",
 428                                  connector->base.id, connector->name,
 429                                  state->crtc->base.id);
 430                 return -EINVAL;
 431         }
 432 
 433         if (!writeback_job->fb) {
 434                 if (writeback_job->out_fence) {
 435                         DRM_DEBUG_ATOMIC("[CONNECTOR:%d:%s] requesting out-fence without framebuffer\n",
 436                                          connector->base.id, connector->name);
 437                         return -EINVAL;
 438                 }
 439 
 440                 drm_writeback_cleanup_job(writeback_job);
 441                 state->writeback_job = NULL;
 442         }
 443 
 444         return 0;
 445 }
 446 
 447 /**
 448  * drm_atomic_get_plane_state - get plane state
 449  * @state: global atomic state object
 450  * @plane: plane to get state object for
 451  *
 452  * This function returns the plane state for the given plane, allocating it if
 453  * needed. It will also grab the relevant plane lock to make sure that the state
 454  * is consistent.
 455  *
 456  * Returns:
 457  *
 458  * Either the allocated state or the error code encoded into the pointer. When
 459  * the error is EDEADLK then the w/w mutex code has detected a deadlock and the
 460  * entire atomic sequence must be restarted. All other errors are fatal.
 461  */
 462 struct drm_plane_state *
 463 drm_atomic_get_plane_state(struct drm_atomic_state *state,
 464                           struct drm_plane *plane)
 465 {
 466         int ret, index = drm_plane_index(plane);
 467         struct drm_plane_state *plane_state;
 468 
 469         WARN_ON(!state->acquire_ctx);
 470 
 471         /* the legacy pointers should never be set */
 472         WARN_ON(plane->fb);
 473         WARN_ON(plane->old_fb);
 474         WARN_ON(plane->crtc);
 475 
 476         plane_state = drm_atomic_get_existing_plane_state(state, plane);
 477         if (plane_state)
 478                 return plane_state;
 479 
 480         ret = drm_modeset_lock(&plane->mutex, state->acquire_ctx);
 481         if (ret)
 482                 return ERR_PTR(ret);
 483 
 484         plane_state = plane->funcs->atomic_duplicate_state(plane);
 485         if (!plane_state)
 486                 return ERR_PTR(-ENOMEM);
 487 
 488         state->planes[index].state = plane_state;
 489         state->planes[index].ptr = plane;
 490         state->planes[index].old_state = plane->state;
 491         state->planes[index].new_state = plane_state;
 492         plane_state->state = state;
 493 
 494         DRM_DEBUG_ATOMIC("Added [PLANE:%d:%s] %p state to %p\n",
 495                          plane->base.id, plane->name, plane_state, state);
 496 
 497         if (plane_state->crtc) {
 498                 struct drm_crtc_state *crtc_state;
 499 
 500                 crtc_state = drm_atomic_get_crtc_state(state,
 501                                                        plane_state->crtc);
 502                 if (IS_ERR(crtc_state))
 503                         return ERR_CAST(crtc_state);
 504         }
 505 
 506         return plane_state;
 507 }
 508 EXPORT_SYMBOL(drm_atomic_get_plane_state);
 509 
 510 static bool
 511 plane_switching_crtc(const struct drm_plane_state *old_plane_state,
 512                      const struct drm_plane_state *new_plane_state)
 513 {
 514         if (!old_plane_state->crtc || !new_plane_state->crtc)
 515                 return false;
 516 
 517         if (old_plane_state->crtc == new_plane_state->crtc)
 518                 return false;
 519 
 520         /* This could be refined, but currently there's no helper or driver code
 521          * to implement direct switching of active planes nor userspace to take
 522          * advantage of more direct plane switching without the intermediate
 523          * full OFF state.
 524          */
 525         return true;
 526 }
 527 
 528 /**
 529  * drm_atomic_plane_check - check plane state
 530  * @old_plane_state: old plane state to check
 531  * @new_plane_state: new plane state to check
 532  *
 533  * Provides core sanity checks for plane state.
 534  *
 535  * RETURNS:
 536  * Zero on success, error code on failure
 537  */
 538 static int drm_atomic_plane_check(const struct drm_plane_state *old_plane_state,
 539                                   const struct drm_plane_state *new_plane_state)
 540 {
 541         struct drm_plane *plane = new_plane_state->plane;
 542         struct drm_crtc *crtc = new_plane_state->crtc;
 543         const struct drm_framebuffer *fb = new_plane_state->fb;
 544         unsigned int fb_width, fb_height;
 545         struct drm_mode_rect *clips;
 546         uint32_t num_clips;
 547         int ret;
 548 
 549         /* either *both* CRTC and FB must be set, or neither */
 550         if (crtc && !fb) {
 551                 DRM_DEBUG_ATOMIC("[PLANE:%d:%s] CRTC set but no FB\n",
 552                                  plane->base.id, plane->name);
 553                 return -EINVAL;
 554         } else if (fb && !crtc) {
 555                 DRM_DEBUG_ATOMIC("[PLANE:%d:%s] FB set but no CRTC\n",
 556                                  plane->base.id, plane->name);
 557                 return -EINVAL;
 558         }
 559 
 560         /* if disabled, we don't care about the rest of the state: */
 561         if (!crtc)
 562                 return 0;
 563 
 564         /* Check whether this plane is usable on this CRTC */
 565         if (!(plane->possible_crtcs & drm_crtc_mask(crtc))) {
 566                 DRM_DEBUG_ATOMIC("Invalid [CRTC:%d:%s] for [PLANE:%d:%s]\n",
 567                                  crtc->base.id, crtc->name,
 568                                  plane->base.id, plane->name);
 569                 return -EINVAL;
 570         }
 571 
 572         /* Check whether this plane supports the fb pixel format. */
 573         ret = drm_plane_check_pixel_format(plane, fb->format->format,
 574                                            fb->modifier);
 575         if (ret) {
 576                 struct drm_format_name_buf format_name;
 577                 DRM_DEBUG_ATOMIC("[PLANE:%d:%s] invalid pixel format %s, modifier 0x%llx\n",
 578                                  plane->base.id, plane->name,
 579                                  drm_get_format_name(fb->format->format,
 580                                                      &format_name),
 581                                  fb->modifier);
 582                 return ret;
 583         }
 584 
 585         /* Give drivers some help against integer overflows */
 586         if (new_plane_state->crtc_w > INT_MAX ||
 587             new_plane_state->crtc_x > INT_MAX - (int32_t) new_plane_state->crtc_w ||
 588             new_plane_state->crtc_h > INT_MAX ||
 589             new_plane_state->crtc_y > INT_MAX - (int32_t) new_plane_state->crtc_h) {
 590                 DRM_DEBUG_ATOMIC("[PLANE:%d:%s] invalid CRTC coordinates %ux%u+%d+%d\n",
 591                                  plane->base.id, plane->name,
 592                                  new_plane_state->crtc_w, new_plane_state->crtc_h,
 593                                  new_plane_state->crtc_x, new_plane_state->crtc_y);
 594                 return -ERANGE;
 595         }
 596 
 597         fb_width = fb->width << 16;
 598         fb_height = fb->height << 16;
 599 
 600         /* Make sure source coordinates are inside the fb. */
 601         if (new_plane_state->src_w > fb_width ||
 602             new_plane_state->src_x > fb_width - new_plane_state->src_w ||
 603             new_plane_state->src_h > fb_height ||
 604             new_plane_state->src_y > fb_height - new_plane_state->src_h) {
 605                 DRM_DEBUG_ATOMIC("[PLANE:%d:%s] invalid source coordinates "
 606                                  "%u.%06ux%u.%06u+%u.%06u+%u.%06u (fb %ux%u)\n",
 607                                  plane->base.id, plane->name,
 608                                  new_plane_state->src_w >> 16,
 609                                  ((new_plane_state->src_w & 0xffff) * 15625) >> 10,
 610                                  new_plane_state->src_h >> 16,
 611                                  ((new_plane_state->src_h & 0xffff) * 15625) >> 10,
 612                                  new_plane_state->src_x >> 16,
 613                                  ((new_plane_state->src_x & 0xffff) * 15625) >> 10,
 614                                  new_plane_state->src_y >> 16,
 615                                  ((new_plane_state->src_y & 0xffff) * 15625) >> 10,
 616                                  fb->width, fb->height);
 617                 return -ENOSPC;
 618         }
 619 
 620         clips = drm_plane_get_damage_clips(new_plane_state);
 621         num_clips = drm_plane_get_damage_clips_count(new_plane_state);
 622 
 623         /* Make sure damage clips are valid and inside the fb. */
 624         while (num_clips > 0) {
 625                 if (clips->x1 >= clips->x2 ||
 626                     clips->y1 >= clips->y2 ||
 627                     clips->x1 < 0 ||
 628                     clips->y1 < 0 ||
 629                     clips->x2 > fb_width ||
 630                     clips->y2 > fb_height) {
 631                         DRM_DEBUG_ATOMIC("[PLANE:%d:%s] invalid damage clip %d %d %d %d\n",
 632                                          plane->base.id, plane->name, clips->x1,
 633                                          clips->y1, clips->x2, clips->y2);
 634                         return -EINVAL;
 635                 }
 636                 clips++;
 637                 num_clips--;
 638         }
 639 
 640         if (plane_switching_crtc(old_plane_state, new_plane_state)) {
 641                 DRM_DEBUG_ATOMIC("[PLANE:%d:%s] switching CRTC directly\n",
 642                                  plane->base.id, plane->name);
 643                 return -EINVAL;
 644         }
 645 
 646         return 0;
 647 }
 648 
 649 static void drm_atomic_plane_print_state(struct drm_printer *p,
 650                 const struct drm_plane_state *state)
 651 {
 652         struct drm_plane *plane = state->plane;
 653         struct drm_rect src  = drm_plane_state_src(state);
 654         struct drm_rect dest = drm_plane_state_dest(state);
 655 
 656         drm_printf(p, "plane[%u]: %s\n", plane->base.id, plane->name);
 657         drm_printf(p, "\tcrtc=%s\n", state->crtc ? state->crtc->name : "(null)");
 658         drm_printf(p, "\tfb=%u\n", state->fb ? state->fb->base.id : 0);
 659         if (state->fb)
 660                 drm_framebuffer_print_info(p, 2, state->fb);
 661         drm_printf(p, "\tcrtc-pos=" DRM_RECT_FMT "\n", DRM_RECT_ARG(&dest));
 662         drm_printf(p, "\tsrc-pos=" DRM_RECT_FP_FMT "\n", DRM_RECT_FP_ARG(&src));
 663         drm_printf(p, "\trotation=%x\n", state->rotation);
 664         drm_printf(p, "\tnormalized-zpos=%x\n", state->normalized_zpos);
 665         drm_printf(p, "\tcolor-encoding=%s\n",
 666                    drm_get_color_encoding_name(state->color_encoding));
 667         drm_printf(p, "\tcolor-range=%s\n",
 668                    drm_get_color_range_name(state->color_range));
 669 
 670         if (plane->funcs->atomic_print_state)
 671                 plane->funcs->atomic_print_state(p, state);
 672 }
 673 
 674 /**
 675  * DOC: handling driver private state
 676  *
 677  * Very often the DRM objects exposed to userspace in the atomic modeset api
 678  * (&drm_connector, &drm_crtc and &drm_plane) do not map neatly to the
 679  * underlying hardware. Especially for any kind of shared resources (e.g. shared
 680  * clocks, scaler units, bandwidth and fifo limits shared among a group of
 681  * planes or CRTCs, and so on) it makes sense to model these as independent
 682  * objects. Drivers then need to do similar state tracking and commit ordering for
 683  * such private (since not exposed to userpace) objects as the atomic core and
 684  * helpers already provide for connectors, planes and CRTCs.
 685  *
 686  * To make this easier on drivers the atomic core provides some support to track
 687  * driver private state objects using struct &drm_private_obj, with the
 688  * associated state struct &drm_private_state.
 689  *
 690  * Similar to userspace-exposed objects, private state structures can be
 691  * acquired by calling drm_atomic_get_private_obj_state(). Since this function
 692  * does not take care of locking, drivers should wrap it for each type of
 693  * private state object they have with the required call to drm_modeset_lock()
 694  * for the corresponding &drm_modeset_lock.
 695  *
 696  * All private state structures contained in a &drm_atomic_state update can be
 697  * iterated using for_each_oldnew_private_obj_in_state(),
 698  * for_each_new_private_obj_in_state() and for_each_old_private_obj_in_state().
 699  * Drivers are recommended to wrap these for each type of driver private state
 700  * object they have, filtering on &drm_private_obj.funcs using for_each_if(), at
 701  * least if they want to iterate over all objects of a given type.
 702  *
 703  * An earlier way to handle driver private state was by subclassing struct
 704  * &drm_atomic_state. But since that encourages non-standard ways to implement
 705  * the check/commit split atomic requires (by using e.g. "check and rollback or
 706  * commit instead" of "duplicate state, check, then either commit or release
 707  * duplicated state) it is deprecated in favour of using &drm_private_state.
 708  */
 709 
 710 /**
 711  * drm_atomic_private_obj_init - initialize private object
 712  * @dev: DRM device this object will be attached to
 713  * @obj: private object
 714  * @state: initial private object state
 715  * @funcs: pointer to the struct of function pointers that identify the object
 716  * type
 717  *
 718  * Initialize the private object, which can be embedded into any
 719  * driver private object that needs its own atomic state.
 720  */
 721 void
 722 drm_atomic_private_obj_init(struct drm_device *dev,
 723                             struct drm_private_obj *obj,
 724                             struct drm_private_state *state,
 725                             const struct drm_private_state_funcs *funcs)
 726 {
 727         memset(obj, 0, sizeof(*obj));
 728 
 729         drm_modeset_lock_init(&obj->lock);
 730 
 731         obj->state = state;
 732         obj->funcs = funcs;
 733         list_add_tail(&obj->head, &dev->mode_config.privobj_list);
 734 }
 735 EXPORT_SYMBOL(drm_atomic_private_obj_init);
 736 
 737 /**
 738  * drm_atomic_private_obj_fini - finalize private object
 739  * @obj: private object
 740  *
 741  * Finalize the private object.
 742  */
 743 void
 744 drm_atomic_private_obj_fini(struct drm_private_obj *obj)
 745 {
 746         list_del(&obj->head);
 747         obj->funcs->atomic_destroy_state(obj, obj->state);
 748         drm_modeset_lock_fini(&obj->lock);
 749 }
 750 EXPORT_SYMBOL(drm_atomic_private_obj_fini);
 751 
 752 /**
 753  * drm_atomic_get_private_obj_state - get private object state
 754  * @state: global atomic state
 755  * @obj: private object to get the state for
 756  *
 757  * This function returns the private object state for the given private object,
 758  * allocating the state if needed. It will also grab the relevant private
 759  * object lock to make sure that the state is consistent.
 760  *
 761  * RETURNS:
 762  *
 763  * Either the allocated state or the error code encoded into a pointer.
 764  */
 765 struct drm_private_state *
 766 drm_atomic_get_private_obj_state(struct drm_atomic_state *state,
 767                                  struct drm_private_obj *obj)
 768 {
 769         int index, num_objs, i, ret;
 770         size_t size;
 771         struct __drm_private_objs_state *arr;
 772         struct drm_private_state *obj_state;
 773 
 774         for (i = 0; i < state->num_private_objs; i++)
 775                 if (obj == state->private_objs[i].ptr)
 776                         return state->private_objs[i].state;
 777 
 778         ret = drm_modeset_lock(&obj->lock, state->acquire_ctx);
 779         if (ret)
 780                 return ERR_PTR(ret);
 781 
 782         num_objs = state->num_private_objs + 1;
 783         size = sizeof(*state->private_objs) * num_objs;
 784         arr = krealloc(state->private_objs, size, GFP_KERNEL);
 785         if (!arr)
 786                 return ERR_PTR(-ENOMEM);
 787 
 788         state->private_objs = arr;
 789         index = state->num_private_objs;
 790         memset(&state->private_objs[index], 0, sizeof(*state->private_objs));
 791 
 792         obj_state = obj->funcs->atomic_duplicate_state(obj);
 793         if (!obj_state)
 794                 return ERR_PTR(-ENOMEM);
 795 
 796         state->private_objs[index].state = obj_state;
 797         state->private_objs[index].old_state = obj->state;
 798         state->private_objs[index].new_state = obj_state;
 799         state->private_objs[index].ptr = obj;
 800         obj_state->state = state;
 801 
 802         state->num_private_objs = num_objs;
 803 
 804         DRM_DEBUG_ATOMIC("Added new private object %p state %p to %p\n",
 805                          obj, obj_state, state);
 806 
 807         return obj_state;
 808 }
 809 EXPORT_SYMBOL(drm_atomic_get_private_obj_state);
 810 
 811 /**
 812  * drm_atomic_get_old_private_obj_state
 813  * @state: global atomic state object
 814  * @obj: private_obj to grab
 815  *
 816  * This function returns the old private object state for the given private_obj,
 817  * or NULL if the private_obj is not part of the global atomic state.
 818  */
 819 struct drm_private_state *
 820 drm_atomic_get_old_private_obj_state(struct drm_atomic_state *state,
 821                                      struct drm_private_obj *obj)
 822 {
 823         int i;
 824 
 825         for (i = 0; i < state->num_private_objs; i++)
 826                 if (obj == state->private_objs[i].ptr)
 827                         return state->private_objs[i].old_state;
 828 
 829         return NULL;
 830 }
 831 EXPORT_SYMBOL(drm_atomic_get_old_private_obj_state);
 832 
 833 /**
 834  * drm_atomic_get_new_private_obj_state
 835  * @state: global atomic state object
 836  * @obj: private_obj to grab
 837  *
 838  * This function returns the new private object state for the given private_obj,
 839  * or NULL if the private_obj is not part of the global atomic state.
 840  */
 841 struct drm_private_state *
 842 drm_atomic_get_new_private_obj_state(struct drm_atomic_state *state,
 843                                      struct drm_private_obj *obj)
 844 {
 845         int i;
 846 
 847         for (i = 0; i < state->num_private_objs; i++)
 848                 if (obj == state->private_objs[i].ptr)
 849                         return state->private_objs[i].new_state;
 850 
 851         return NULL;
 852 }
 853 EXPORT_SYMBOL(drm_atomic_get_new_private_obj_state);
 854 
 855 /**
 856  * drm_atomic_get_old_connector_for_encoder - Get old connector for an encoder
 857  * @state: Atomic state
 858  * @encoder: The encoder to fetch the connector state for
 859  *
 860  * This function finds and returns the connector that was connected to @encoder
 861  * as specified by the @state.
 862  *
 863  * If there is no connector in @state which previously had @encoder connected to
 864  * it, this function will return NULL. While this may seem like an invalid use
 865  * case, it is sometimes useful to differentiate commits which had no prior
 866  * connectors attached to @encoder vs ones that did (and to inspect their
 867  * state). This is especially true in enable hooks because the pipeline has
 868  * changed.
 869  *
 870  * Returns: The old connector connected to @encoder, or NULL if the encoder is
 871  * not connected.
 872  */
 873 struct drm_connector *
 874 drm_atomic_get_old_connector_for_encoder(struct drm_atomic_state *state,
 875                                          struct drm_encoder *encoder)
 876 {
 877         struct drm_connector_state *conn_state;
 878         struct drm_connector *connector;
 879         unsigned int i;
 880 
 881         for_each_old_connector_in_state(state, connector, conn_state, i) {
 882                 if (conn_state->best_encoder == encoder)
 883                         return connector;
 884         }
 885 
 886         return NULL;
 887 }
 888 EXPORT_SYMBOL(drm_atomic_get_old_connector_for_encoder);
 889 
 890 /**
 891  * drm_atomic_get_new_connector_for_encoder - Get new connector for an encoder
 892  * @state: Atomic state
 893  * @encoder: The encoder to fetch the connector state for
 894  *
 895  * This function finds and returns the connector that will be connected to
 896  * @encoder as specified by the @state.
 897  *
 898  * If there is no connector in @state which will have @encoder connected to it,
 899  * this function will return NULL. While this may seem like an invalid use case,
 900  * it is sometimes useful to differentiate commits which have no connectors
 901  * attached to @encoder vs ones that do (and to inspect their state). This is
 902  * especially true in disable hooks because the pipeline will change.
 903  *
 904  * Returns: The new connector connected to @encoder, or NULL if the encoder is
 905  * not connected.
 906  */
 907 struct drm_connector *
 908 drm_atomic_get_new_connector_for_encoder(struct drm_atomic_state *state,
 909                                          struct drm_encoder *encoder)
 910 {
 911         struct drm_connector_state *conn_state;
 912         struct drm_connector *connector;
 913         unsigned int i;
 914 
 915         for_each_new_connector_in_state(state, connector, conn_state, i) {
 916                 if (conn_state->best_encoder == encoder)
 917                         return connector;
 918         }
 919 
 920         return NULL;
 921 }
 922 EXPORT_SYMBOL(drm_atomic_get_new_connector_for_encoder);
 923 
 924 /**
 925  * drm_atomic_get_connector_state - get connector state
 926  * @state: global atomic state object
 927  * @connector: connector to get state object for
 928  *
 929  * This function returns the connector state for the given connector,
 930  * allocating it if needed. It will also grab the relevant connector lock to
 931  * make sure that the state is consistent.
 932  *
 933  * Returns:
 934  *
 935  * Either the allocated state or the error code encoded into the pointer. When
 936  * the error is EDEADLK then the w/w mutex code has detected a deadlock and the
 937  * entire atomic sequence must be restarted. All other errors are fatal.
 938  */
 939 struct drm_connector_state *
 940 drm_atomic_get_connector_state(struct drm_atomic_state *state,
 941                           struct drm_connector *connector)
 942 {
 943         int ret, index;
 944         struct drm_mode_config *config = &connector->dev->mode_config;
 945         struct drm_connector_state *connector_state;
 946 
 947         WARN_ON(!state->acquire_ctx);
 948 
 949         ret = drm_modeset_lock(&config->connection_mutex, state->acquire_ctx);
 950         if (ret)
 951                 return ERR_PTR(ret);
 952 
 953         index = drm_connector_index(connector);
 954 
 955         if (index >= state->num_connector) {
 956                 struct __drm_connnectors_state *c;
 957                 int alloc = max(index + 1, config->num_connector);
 958 
 959                 c = krealloc(state->connectors, alloc * sizeof(*state->connectors), GFP_KERNEL);
 960                 if (!c)
 961                         return ERR_PTR(-ENOMEM);
 962 
 963                 state->connectors = c;
 964                 memset(&state->connectors[state->num_connector], 0,
 965                        sizeof(*state->connectors) * (alloc - state->num_connector));
 966 
 967                 state->num_connector = alloc;
 968         }
 969 
 970         if (state->connectors[index].state)
 971                 return state->connectors[index].state;
 972 
 973         connector_state = connector->funcs->atomic_duplicate_state(connector);
 974         if (!connector_state)
 975                 return ERR_PTR(-ENOMEM);
 976 
 977         drm_connector_get(connector);
 978         state->connectors[index].state = connector_state;
 979         state->connectors[index].old_state = connector->state;
 980         state->connectors[index].new_state = connector_state;
 981         state->connectors[index].ptr = connector;
 982         connector_state->state = state;
 983 
 984         DRM_DEBUG_ATOMIC("Added [CONNECTOR:%d:%s] %p state to %p\n",
 985                          connector->base.id, connector->name,
 986                          connector_state, state);
 987 
 988         if (connector_state->crtc) {
 989                 struct drm_crtc_state *crtc_state;
 990 
 991                 crtc_state = drm_atomic_get_crtc_state(state,
 992                                                        connector_state->crtc);
 993                 if (IS_ERR(crtc_state))
 994                         return ERR_CAST(crtc_state);
 995         }
 996 
 997         return connector_state;
 998 }
 999 EXPORT_SYMBOL(drm_atomic_get_connector_state);
1000 
1001 static void drm_atomic_connector_print_state(struct drm_printer *p,
1002                 const struct drm_connector_state *state)
1003 {
1004         struct drm_connector *connector = state->connector;
1005 
1006         drm_printf(p, "connector[%u]: %s\n", connector->base.id, connector->name);
1007         drm_printf(p, "\tcrtc=%s\n", state->crtc ? state->crtc->name : "(null)");
1008         drm_printf(p, "\tself_refresh_aware=%d\n", state->self_refresh_aware);
1009 
1010         if (connector->connector_type == DRM_MODE_CONNECTOR_WRITEBACK)
1011                 if (state->writeback_job && state->writeback_job->fb)
1012                         drm_printf(p, "\tfb=%d\n", state->writeback_job->fb->base.id);
1013 
1014         if (connector->funcs->atomic_print_state)
1015                 connector->funcs->atomic_print_state(p, state);
1016 }
1017 
1018 /**
1019  * drm_atomic_add_affected_connectors - add connectors for crtc
1020  * @state: atomic state
1021  * @crtc: DRM crtc
1022  *
1023  * This function walks the current configuration and adds all connectors
1024  * currently using @crtc to the atomic configuration @state. Note that this
1025  * function must acquire the connection mutex. This can potentially cause
1026  * unneeded seralization if the update is just for the planes on one crtc. Hence
1027  * drivers and helpers should only call this when really needed (e.g. when a
1028  * full modeset needs to happen due to some change).
1029  *
1030  * Returns:
1031  * 0 on success or can fail with -EDEADLK or -ENOMEM. When the error is EDEADLK
1032  * then the w/w mutex code has detected a deadlock and the entire atomic
1033  * sequence must be restarted. All other errors are fatal.
1034  */
1035 int
1036 drm_atomic_add_affected_connectors(struct drm_atomic_state *state,
1037                                    struct drm_crtc *crtc)
1038 {
1039         struct drm_mode_config *config = &state->dev->mode_config;
1040         struct drm_connector *connector;
1041         struct drm_connector_state *conn_state;
1042         struct drm_connector_list_iter conn_iter;
1043         struct drm_crtc_state *crtc_state;
1044         int ret;
1045 
1046         crtc_state = drm_atomic_get_crtc_state(state, crtc);
1047         if (IS_ERR(crtc_state))
1048                 return PTR_ERR(crtc_state);
1049 
1050         ret = drm_modeset_lock(&config->connection_mutex, state->acquire_ctx);
1051         if (ret)
1052                 return ret;
1053 
1054         DRM_DEBUG_ATOMIC("Adding all current connectors for [CRTC:%d:%s] to %p\n",
1055                          crtc->base.id, crtc->name, state);
1056 
1057         /*
1058          * Changed connectors are already in @state, so only need to look
1059          * at the connector_mask in crtc_state.
1060          */
1061         drm_connector_list_iter_begin(state->dev, &conn_iter);
1062         drm_for_each_connector_iter(connector, &conn_iter) {
1063                 if (!(crtc_state->connector_mask & drm_connector_mask(connector)))
1064                         continue;
1065 
1066                 conn_state = drm_atomic_get_connector_state(state, connector);
1067                 if (IS_ERR(conn_state)) {
1068                         drm_connector_list_iter_end(&conn_iter);
1069                         return PTR_ERR(conn_state);
1070                 }
1071         }
1072         drm_connector_list_iter_end(&conn_iter);
1073 
1074         return 0;
1075 }
1076 EXPORT_SYMBOL(drm_atomic_add_affected_connectors);
1077 
1078 /**
1079  * drm_atomic_add_affected_planes - add planes for crtc
1080  * @state: atomic state
1081  * @crtc: DRM crtc
1082  *
1083  * This function walks the current configuration and adds all planes
1084  * currently used by @crtc to the atomic configuration @state. This is useful
1085  * when an atomic commit also needs to check all currently enabled plane on
1086  * @crtc, e.g. when changing the mode. It's also useful when re-enabling a CRTC
1087  * to avoid special code to force-enable all planes.
1088  *
1089  * Since acquiring a plane state will always also acquire the w/w mutex of the
1090  * current CRTC for that plane (if there is any) adding all the plane states for
1091  * a CRTC will not reduce parallism of atomic updates.
1092  *
1093  * Returns:
1094  * 0 on success or can fail with -EDEADLK or -ENOMEM. When the error is EDEADLK
1095  * then the w/w mutex code has detected a deadlock and the entire atomic
1096  * sequence must be restarted. All other errors are fatal.
1097  */
1098 int
1099 drm_atomic_add_affected_planes(struct drm_atomic_state *state,
1100                                struct drm_crtc *crtc)
1101 {
1102         const struct drm_crtc_state *old_crtc_state =
1103                 drm_atomic_get_old_crtc_state(state, crtc);
1104         struct drm_plane *plane;
1105 
1106         WARN_ON(!drm_atomic_get_new_crtc_state(state, crtc));
1107 
1108         DRM_DEBUG_ATOMIC("Adding all current planes for [CRTC:%d:%s] to %p\n",
1109                          crtc->base.id, crtc->name, state);
1110 
1111         drm_for_each_plane_mask(plane, state->dev, old_crtc_state->plane_mask) {
1112                 struct drm_plane_state *plane_state =
1113                         drm_atomic_get_plane_state(state, plane);
1114 
1115                 if (IS_ERR(plane_state))
1116                         return PTR_ERR(plane_state);
1117         }
1118         return 0;
1119 }
1120 EXPORT_SYMBOL(drm_atomic_add_affected_planes);
1121 
1122 /**
1123  * drm_atomic_check_only - check whether a given config would work
1124  * @state: atomic configuration to check
1125  *
1126  * Note that this function can return -EDEADLK if the driver needed to acquire
1127  * more locks but encountered a deadlock. The caller must then do the usual w/w
1128  * backoff dance and restart. All other errors are fatal.
1129  *
1130  * Returns:
1131  * 0 on success, negative error code on failure.
1132  */
1133 int drm_atomic_check_only(struct drm_atomic_state *state)
1134 {
1135         struct drm_device *dev = state->dev;
1136         struct drm_mode_config *config = &dev->mode_config;
1137         struct drm_plane *plane;
1138         struct drm_plane_state *old_plane_state;
1139         struct drm_plane_state *new_plane_state;
1140         struct drm_crtc *crtc;
1141         struct drm_crtc_state *old_crtc_state;
1142         struct drm_crtc_state *new_crtc_state;
1143         struct drm_connector *conn;
1144         struct drm_connector_state *conn_state;
1145         int i, ret = 0;
1146 
1147         DRM_DEBUG_ATOMIC("checking %p\n", state);
1148 
1149         for_each_oldnew_plane_in_state(state, plane, old_plane_state, new_plane_state, i) {
1150                 ret = drm_atomic_plane_check(old_plane_state, new_plane_state);
1151                 if (ret) {
1152                         DRM_DEBUG_ATOMIC("[PLANE:%d:%s] atomic core check failed\n",
1153                                          plane->base.id, plane->name);
1154                         return ret;
1155                 }
1156         }
1157 
1158         for_each_oldnew_crtc_in_state(state, crtc, old_crtc_state, new_crtc_state, i) {
1159                 ret = drm_atomic_crtc_check(old_crtc_state, new_crtc_state);
1160                 if (ret) {
1161                         DRM_DEBUG_ATOMIC("[CRTC:%d:%s] atomic core check failed\n",
1162                                          crtc->base.id, crtc->name);
1163                         return ret;
1164                 }
1165         }
1166 
1167         for_each_new_connector_in_state(state, conn, conn_state, i) {
1168                 ret = drm_atomic_connector_check(conn, conn_state);
1169                 if (ret) {
1170                         DRM_DEBUG_ATOMIC("[CONNECTOR:%d:%s] atomic core check failed\n",
1171                                          conn->base.id, conn->name);
1172                         return ret;
1173                 }
1174         }
1175 
1176         if (config->funcs->atomic_check) {
1177                 ret = config->funcs->atomic_check(state->dev, state);
1178 
1179                 if (ret) {
1180                         DRM_DEBUG_ATOMIC("atomic driver check for %p failed: %d\n",
1181                                          state, ret);
1182                         return ret;
1183                 }
1184         }
1185 
1186         if (!state->allow_modeset) {
1187                 for_each_new_crtc_in_state(state, crtc, new_crtc_state, i) {
1188                         if (drm_atomic_crtc_needs_modeset(new_crtc_state)) {
1189                                 DRM_DEBUG_ATOMIC("[CRTC:%d:%s] requires full modeset\n",
1190                                                  crtc->base.id, crtc->name);
1191                                 return -EINVAL;
1192                         }
1193                 }
1194         }
1195 
1196         return 0;
1197 }
1198 EXPORT_SYMBOL(drm_atomic_check_only);
1199 
1200 /**
1201  * drm_atomic_commit - commit configuration atomically
1202  * @state: atomic configuration to check
1203  *
1204  * Note that this function can return -EDEADLK if the driver needed to acquire
1205  * more locks but encountered a deadlock. The caller must then do the usual w/w
1206  * backoff dance and restart. All other errors are fatal.
1207  *
1208  * This function will take its own reference on @state.
1209  * Callers should always release their reference with drm_atomic_state_put().
1210  *
1211  * Returns:
1212  * 0 on success, negative error code on failure.
1213  */
1214 int drm_atomic_commit(struct drm_atomic_state *state)
1215 {
1216         struct drm_mode_config *config = &state->dev->mode_config;
1217         int ret;
1218 
1219         ret = drm_atomic_check_only(state);
1220         if (ret)
1221                 return ret;
1222 
1223         DRM_DEBUG_ATOMIC("committing %p\n", state);
1224 
1225         return config->funcs->atomic_commit(state->dev, state, false);
1226 }
1227 EXPORT_SYMBOL(drm_atomic_commit);
1228 
1229 /**
1230  * drm_atomic_nonblocking_commit - atomic nonblocking commit
1231  * @state: atomic configuration to check
1232  *
1233  * Note that this function can return -EDEADLK if the driver needed to acquire
1234  * more locks but encountered a deadlock. The caller must then do the usual w/w
1235  * backoff dance and restart. All other errors are fatal.
1236  *
1237  * This function will take its own reference on @state.
1238  * Callers should always release their reference with drm_atomic_state_put().
1239  *
1240  * Returns:
1241  * 0 on success, negative error code on failure.
1242  */
1243 int drm_atomic_nonblocking_commit(struct drm_atomic_state *state)
1244 {
1245         struct drm_mode_config *config = &state->dev->mode_config;
1246         int ret;
1247 
1248         ret = drm_atomic_check_only(state);
1249         if (ret)
1250                 return ret;
1251 
1252         DRM_DEBUG_ATOMIC("committing %p nonblocking\n", state);
1253 
1254         return config->funcs->atomic_commit(state->dev, state, true);
1255 }
1256 EXPORT_SYMBOL(drm_atomic_nonblocking_commit);
1257 
1258 /* just used from drm-client and atomic-helper: */
1259 int __drm_atomic_helper_disable_plane(struct drm_plane *plane,
1260                                       struct drm_plane_state *plane_state)
1261 {
1262         int ret;
1263 
1264         ret = drm_atomic_set_crtc_for_plane(plane_state, NULL);
1265         if (ret != 0)
1266                 return ret;
1267 
1268         drm_atomic_set_fb_for_plane(plane_state, NULL);
1269         plane_state->crtc_x = 0;
1270         plane_state->crtc_y = 0;
1271         plane_state->crtc_w = 0;
1272         plane_state->crtc_h = 0;
1273         plane_state->src_x = 0;
1274         plane_state->src_y = 0;
1275         plane_state->src_w = 0;
1276         plane_state->src_h = 0;
1277 
1278         return 0;
1279 }
1280 EXPORT_SYMBOL(__drm_atomic_helper_disable_plane);
1281 
1282 static int update_output_state(struct drm_atomic_state *state,
1283                                struct drm_mode_set *set)
1284 {
1285         struct drm_device *dev = set->crtc->dev;
1286         struct drm_crtc *crtc;
1287         struct drm_crtc_state *new_crtc_state;
1288         struct drm_connector *connector;
1289         struct drm_connector_state *new_conn_state;
1290         int ret, i;
1291 
1292         ret = drm_modeset_lock(&dev->mode_config.connection_mutex,
1293                                state->acquire_ctx);
1294         if (ret)
1295                 return ret;
1296 
1297         /* First disable all connectors on the target crtc. */
1298         ret = drm_atomic_add_affected_connectors(state, set->crtc);
1299         if (ret)
1300                 return ret;
1301 
1302         for_each_new_connector_in_state(state, connector, new_conn_state, i) {
1303                 if (new_conn_state->crtc == set->crtc) {
1304                         ret = drm_atomic_set_crtc_for_connector(new_conn_state,
1305                                                                 NULL);
1306                         if (ret)
1307                                 return ret;
1308 
1309                         /* Make sure legacy setCrtc always re-trains */
1310                         new_conn_state->link_status = DRM_LINK_STATUS_GOOD;
1311                 }
1312         }
1313 
1314         /* Then set all connectors from set->connectors on the target crtc */
1315         for (i = 0; i < set->num_connectors; i++) {
1316                 new_conn_state = drm_atomic_get_connector_state(state,
1317                                                                 set->connectors[i]);
1318                 if (IS_ERR(new_conn_state))
1319                         return PTR_ERR(new_conn_state);
1320 
1321                 ret = drm_atomic_set_crtc_for_connector(new_conn_state,
1322                                                         set->crtc);
1323                 if (ret)
1324                         return ret;
1325         }
1326 
1327         for_each_new_crtc_in_state(state, crtc, new_crtc_state, i) {
1328                 /*
1329                  * Don't update ->enable for the CRTC in the set_config request,
1330                  * since a mismatch would indicate a bug in the upper layers.
1331                  * The actual modeset code later on will catch any
1332                  * inconsistencies here.
1333                  */
1334                 if (crtc == set->crtc)
1335                         continue;
1336 
1337                 if (!new_crtc_state->connector_mask) {
1338                         ret = drm_atomic_set_mode_prop_for_crtc(new_crtc_state,
1339                                                                 NULL);
1340                         if (ret < 0)
1341                                 return ret;
1342 
1343                         new_crtc_state->active = false;
1344                 }
1345         }
1346 
1347         return 0;
1348 }
1349 
1350 /* just used from drm-client and atomic-helper: */
1351 int __drm_atomic_helper_set_config(struct drm_mode_set *set,
1352                                    struct drm_atomic_state *state)
1353 {
1354         struct drm_crtc_state *crtc_state;
1355         struct drm_plane_state *primary_state;
1356         struct drm_crtc *crtc = set->crtc;
1357         int hdisplay, vdisplay;
1358         int ret;
1359 
1360         crtc_state = drm_atomic_get_crtc_state(state, crtc);
1361         if (IS_ERR(crtc_state))
1362                 return PTR_ERR(crtc_state);
1363 
1364         primary_state = drm_atomic_get_plane_state(state, crtc->primary);
1365         if (IS_ERR(primary_state))
1366                 return PTR_ERR(primary_state);
1367 
1368         if (!set->mode) {
1369                 WARN_ON(set->fb);
1370                 WARN_ON(set->num_connectors);
1371 
1372                 ret = drm_atomic_set_mode_for_crtc(crtc_state, NULL);
1373                 if (ret != 0)
1374                         return ret;
1375 
1376                 crtc_state->active = false;
1377 
1378                 ret = drm_atomic_set_crtc_for_plane(primary_state, NULL);
1379                 if (ret != 0)
1380                         return ret;
1381 
1382                 drm_atomic_set_fb_for_plane(primary_state, NULL);
1383 
1384                 goto commit;
1385         }
1386 
1387         WARN_ON(!set->fb);
1388         WARN_ON(!set->num_connectors);
1389 
1390         ret = drm_atomic_set_mode_for_crtc(crtc_state, set->mode);
1391         if (ret != 0)
1392                 return ret;
1393 
1394         crtc_state->active = true;
1395 
1396         ret = drm_atomic_set_crtc_for_plane(primary_state, crtc);
1397         if (ret != 0)
1398                 return ret;
1399 
1400         drm_mode_get_hv_timing(set->mode, &hdisplay, &vdisplay);
1401 
1402         drm_atomic_set_fb_for_plane(primary_state, set->fb);
1403         primary_state->crtc_x = 0;
1404         primary_state->crtc_y = 0;
1405         primary_state->crtc_w = hdisplay;
1406         primary_state->crtc_h = vdisplay;
1407         primary_state->src_x = set->x << 16;
1408         primary_state->src_y = set->y << 16;
1409         if (drm_rotation_90_or_270(primary_state->rotation)) {
1410                 primary_state->src_w = vdisplay << 16;
1411                 primary_state->src_h = hdisplay << 16;
1412         } else {
1413                 primary_state->src_w = hdisplay << 16;
1414                 primary_state->src_h = vdisplay << 16;
1415         }
1416 
1417 commit:
1418         ret = update_output_state(state, set);
1419         if (ret)
1420                 return ret;
1421 
1422         return 0;
1423 }
1424 EXPORT_SYMBOL(__drm_atomic_helper_set_config);
1425 
1426 void drm_atomic_print_state(const struct drm_atomic_state *state)
1427 {
1428         struct drm_printer p = drm_info_printer(state->dev->dev);
1429         struct drm_plane *plane;
1430         struct drm_plane_state *plane_state;
1431         struct drm_crtc *crtc;
1432         struct drm_crtc_state *crtc_state;
1433         struct drm_connector *connector;
1434         struct drm_connector_state *connector_state;
1435         int i;
1436 
1437         DRM_DEBUG_ATOMIC("checking %p\n", state);
1438 
1439         for_each_new_plane_in_state(state, plane, plane_state, i)
1440                 drm_atomic_plane_print_state(&p, plane_state);
1441 
1442         for_each_new_crtc_in_state(state, crtc, crtc_state, i)
1443                 drm_atomic_crtc_print_state(&p, crtc_state);
1444 
1445         for_each_new_connector_in_state(state, connector, connector_state, i)
1446                 drm_atomic_connector_print_state(&p, connector_state);
1447 }
1448 
1449 static void __drm_state_dump(struct drm_device *dev, struct drm_printer *p,
1450                              bool take_locks)
1451 {
1452         struct drm_mode_config *config = &dev->mode_config;
1453         struct drm_plane *plane;
1454         struct drm_crtc *crtc;
1455         struct drm_connector *connector;
1456         struct drm_connector_list_iter conn_iter;
1457 
1458         if (!drm_drv_uses_atomic_modeset(dev))
1459                 return;
1460 
1461         list_for_each_entry(plane, &config->plane_list, head) {
1462                 if (take_locks)
1463                         drm_modeset_lock(&plane->mutex, NULL);
1464                 drm_atomic_plane_print_state(p, plane->state);
1465                 if (take_locks)
1466                         drm_modeset_unlock(&plane->mutex);
1467         }
1468 
1469         list_for_each_entry(crtc, &config->crtc_list, head) {
1470                 if (take_locks)
1471                         drm_modeset_lock(&crtc->mutex, NULL);
1472                 drm_atomic_crtc_print_state(p, crtc->state);
1473                 if (take_locks)
1474                         drm_modeset_unlock(&crtc->mutex);
1475         }
1476 
1477         drm_connector_list_iter_begin(dev, &conn_iter);
1478         if (take_locks)
1479                 drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
1480         drm_for_each_connector_iter(connector, &conn_iter)
1481                 drm_atomic_connector_print_state(p, connector->state);
1482         if (take_locks)
1483                 drm_modeset_unlock(&dev->mode_config.connection_mutex);
1484         drm_connector_list_iter_end(&conn_iter);
1485 }
1486 
1487 /**
1488  * drm_state_dump - dump entire device atomic state
1489  * @dev: the drm device
1490  * @p: where to print the state to
1491  *
1492  * Just for debugging.  Drivers might want an option to dump state
1493  * to dmesg in case of error irq's.  (Hint, you probably want to
1494  * ratelimit this!)
1495  *
1496  * The caller must drm_modeset_lock_all(), or if this is called
1497  * from error irq handler, it should not be enabled by default.
1498  * (Ie. if you are debugging errors you might not care that this
1499  * is racey.  But calling this without all modeset locks held is
1500  * not inherently safe.)
1501  */
1502 void drm_state_dump(struct drm_device *dev, struct drm_printer *p)
1503 {
1504         __drm_state_dump(dev, p, false);
1505 }
1506 EXPORT_SYMBOL(drm_state_dump);
1507 
1508 #ifdef CONFIG_DEBUG_FS
1509 static int drm_state_info(struct seq_file *m, void *data)
1510 {
1511         struct drm_info_node *node = (struct drm_info_node *) m->private;
1512         struct drm_device *dev = node->minor->dev;
1513         struct drm_printer p = drm_seq_file_printer(m);
1514 
1515         __drm_state_dump(dev, &p, true);
1516 
1517         return 0;
1518 }
1519 
1520 /* any use in debugfs files to dump individual planes/crtc/etc? */
1521 static const struct drm_info_list drm_atomic_debugfs_list[] = {
1522         {"state", drm_state_info, 0},
1523 };
1524 
1525 int drm_atomic_debugfs_init(struct drm_minor *minor)
1526 {
1527         return drm_debugfs_create_files(drm_atomic_debugfs_list,
1528                         ARRAY_SIZE(drm_atomic_debugfs_list),
1529                         minor->debugfs_root, minor);
1530 }
1531 #endif