drivers/gpu/drm/drm_atomic.c

   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 <[email protected]>
  25  * Daniel Vetter <[email protected]>
  26  */
  27
  28
  29 #include <drm/drmP.h>
  30 #include <drm/drm_atomic.h>
  31 #include <drm/drm_atomic_uapi.h>
  32 #include <drm/drm_mode.h>
  33 #include <drm/drm_print.h>
  34 #include <drm/drm_writeback.h>
  35 #include <linux/sync_file.h>
  36
  37 #include "drm_crtc_internal.h"
  38 #include "drm_internal.h"
  39
  40 void __drm_crtc_commit_free(struct kref *kref)
  41 {
  42         struct drm_crtc_commit *commit =
  43                 container_of(kref, struct drm_crtc_commit, ref);
  44
  45         kfree(commit);
  46 }
  47 EXPORT_SYMBOL(__drm_crtc_commit_free);
  48
  49 /**
  50  * drm_atomic_state_default_release -
  51  * release memory initialized by drm_atomic_state_init
  52  * @state: atomic state
  53  *
  54  * Free all the memory allocated by drm_atomic_state_init.
  55  * This should only be used by drivers which are still subclassing
  56  * &drm_atomic_state and haven't switched to &drm_private_state yet.
  57  */
  58 void drm_atomic_state_default_release(struct drm_atomic_state *state)
  59 {
  60         kfree(state->connectors);
  61         kfree(state->crtcs);
  62         kfree(state->planes);
  63         kfree(state->private_objs);
  64 }
  65 EXPORT_SYMBOL(drm_atomic_state_default_release);
  66
  67 /**
  68  * drm_atomic_state_init - init new atomic state
  69  * @dev: DRM device
  70  * @state: atomic state
  71  *
  72  * Default implementation for filling in a new atomic state.
  73  * This should only be used by drivers which are still subclassing
  74  * &drm_atomic_state and haven't switched to &drm_private_state yet.
  75  */
  76 int
  77 drm_atomic_state_init(struct drm_device *dev, struct drm_atomic_state *state)
  78 {
  79         kref_init(&state->ref);
  80
  81         /* TODO legacy paths should maybe do a better job about
  82          * setting this appropriately?
  83          */
  84         state->allow_modeset = true;
  85
  86         state->crtcs = kcalloc(dev->mode_config.num_crtc,
  87                                sizeof(*state->crtcs), GFP_KERNEL);
  88         if (!state->crtcs)
  89                 goto fail;
  90         state->planes = kcalloc(dev->mode_config.num_total_plane,
  91                                 sizeof(*state->planes), GFP_KERNEL);
  92         if (!state->planes)
  93                 goto fail;
  94
  95         state->dev = dev;
  96
  97         DRM_DEBUG_ATOMIC("Allocated atomic state %p\n", state);
  98
  99         return 0;
 100 fail:
 101         drm_atomic_state_default_release(state);
 102         return -ENOMEM;
 103 }
 104 EXPORT_SYMBOL(drm_atomic_state_init);
 105
 106 /**
 107  * drm_atomic_state_alloc - allocate atomic state
 108  * @dev: DRM device
 109  *
 110  * This allocates an empty atomic state to track updates.
 111  */
 112 struct drm_atomic_state *
 113 drm_atomic_state_alloc(struct drm_device *dev)
 114 {
 115         struct drm_mode_config *config = &dev->mode_config;
 116
 117         if (!config->funcs->atomic_state_alloc) {
 118                 struct drm_atomic_state *state;
 119
 120                 state = kzalloc(sizeof(*state), GFP_KERNEL);
 121                 if (!state)
 122                         return NULL;
 123                 if (drm_atomic_state_init(dev, state) < 0) {
 124                         kfree(state);
 125                         return NULL;
 126                 }
 127                 return state;
 128         }
 129
 130         return config->funcs->atomic_state_alloc(dev);
 131 }
 132 EXPORT_SYMBOL(drm_atomic_state_alloc);
 133
 134 /**
 135  * drm_atomic_state_default_clear - clear base atomic state
 136  * @state: atomic state
 137  *
 138  * Default implementation for clearing atomic state.
 139  * This should only be used by drivers which are still subclassing
 140  * &drm_atomic_state and haven't switched to &drm_private_state yet.
 141  */
 142 void drm_atomic_state_default_clear(struct drm_atomic_state *state)
 143 {
 144         struct drm_device *dev = state->dev;
 145         struct drm_mode_config *config = &dev->mode_config;
 146         int i;
 147
 148         DRM_DEBUG_ATOMIC("Clearing atomic state %p\n", state);
 149
 150         for (i = 0; i < state->num_connector; i++) {
 151                 struct drm_connector *connector = state->connectors[i].ptr;
 152
 153                 if (!connector)
 154                         continue;
 155
 156                 connector->funcs->atomic_destroy_state(connector,
 157                                                        state->connectors[i].state);
 158                 state->connectors[i].ptr = NULL;
 159                 state->connectors[i].state = NULL;
 160                 state->connectors[i].old_state = NULL;
 161                 state->connectors[i].new_state = NULL;
 162                 drm_connector_put(connector);
 163         }
 164
 165         for (i = 0; i < config->num_crtc; i++) {
 166                 struct drm_crtc *crtc = state->crtcs[i].ptr;
 167
 168                 if (!crtc)
 169                         continue;
 170
 171                 crtc->funcs->atomic_destroy_state(crtc,
 172                                                   state->crtcs[i].state);
 173
 174                 state->crtcs[i].ptr = NULL;
 175                 state->crtcs[i].state = NULL;
 176                 state->crtcs[i].old_state = NULL;
 177                 state->crtcs[i].new_state = NULL;
 178
 179                 if (state->crtcs[i].commit) {
 180                         drm_crtc_commit_put(state->crtcs[i].commit);
 181                         state->crtcs[i].commit = NULL;
 182                 }
 183         }
 184
 185         for (i = 0; i < config->num_total_plane; i++) {
 186                 struct drm_plane *plane = state->planes[i].ptr;
 187
 188                 if (!plane)
 189                         continue;
 190
 191                 plane->funcs->atomic_destroy_state(plane,
 192                                                    state->planes[i].state);
 193                 state->planes[i].ptr = NULL;
 194                 state->planes[i].state = NULL;
 195                 state->planes[i].old_state = NULL;
 196                 state->planes[i].new_state = NULL;
 197         }
 198
 199         for (i = 0; i < state->num_private_objs; i++) {
 200                 struct drm_private_obj *obj = state->private_objs[i].ptr;
 201
 202                 obj->funcs->atomic_destroy_state(obj,
 203                                                  state->private_objs[i].state);
 204                 state->private_objs[i].ptr = NULL;
 205                 state->private_objs[i].state = NULL;
 206                 state->private_objs[i].old_state = NULL;
 207                 state->private_objs[i].new_state = NULL;
 208         }
 209         state->num_private_objs = 0;
 210
 211         if (state->fake_commit) {
 212                 drm_crtc_commit_put(state->fake_commit);
 213                 state->fake_commit = NULL;
 214         }
 215 }
 216 EXPORT_SYMBOL(drm_atomic_state_default_clear);
 217
 218 /**
 219  * drm_atomic_state_clear - clear state object
 220  * @state: atomic state
 221  *
 222  * When the w/w mutex algorithm detects a deadlock we need to back off and drop
 223  * all locks. So someone else could sneak in and change the current modeset
 224  * configuration. Which means that all the state assembled in @state is no
 225  * longer an atomic update to the current state, but to some arbitrary earlier
 226  * state. Which could break assumptions the driver's
 227  * &drm_mode_config_funcs.atomic_check likely relies on.
 228  *
 229  * Hence we must clear all cached state and completely start over, using this
 230  * function.
 231  */
 232 void drm_atomic_state_clear(struct drm_atomic_state *state)
 233 {
 234         struct drm_device *dev = state->dev;
 235         struct drm_mode_config *config = &dev->mode_config;
 236
 237         if (config->funcs->atomic_state_clear)
 238                 config->funcs->atomic_state_clear(state);
 239         else
 240                 drm_atomic_state_default_clear(state);
 241 }
 242 EXPORT_SYMBOL(drm_atomic_state_clear);
 243
 244 /**
 245  * __drm_atomic_state_free - free all memory for an atomic state
 246  * @ref: This atomic state to deallocate
 247  *
 248  * This frees all memory associated with an atomic state, including all the
 249  * per-object state for planes, crtcs and connectors.
 250  */
 251 void __drm_atomic_state_free(struct kref *ref)
 252 {
 253         struct drm_atomic_state *state = container_of(ref, typeof(*state), ref);
 254         struct drm_mode_config *config = &state->dev->mode_config;
 255
 256         drm_atomic_state_clear(state);
 257
 258         DRM_DEBUG_ATOMIC("Freeing atomic state %p\n", state);
 259
 260         if (config->funcs->atomic_state_free) {
 261                 config->funcs->atomic_state_free(state);
 262         } else {
 263                 drm_atomic_state_default_release(state);
 264                 kfree(state);
 265         }
 266 }
 267 EXPORT_SYMBOL(__drm_atomic_state_free);
 268
 269 /**
 270  * drm_atomic_get_crtc_state - get crtc state
 271  * @state: global atomic state object
 272  * @crtc: crtc to get state object for
 273  *
 274  * This function returns the crtc state for the given crtc, allocating it if
 275  * needed. It will also grab the relevant crtc lock to make sure that the state
 276  * is consistent.
 277  *
 278  * Returns:
 279  *
 280  * Either the allocated state or the error code encoded into the pointer. When
 281  * the error is EDEADLK then the w/w mutex code has detected a deadlock and the
 282  * entire atomic sequence must be restarted. All other errors are fatal.
 283  */
 284 struct drm_crtc_state *
 285 drm_atomic_get_crtc_state(struct drm_atomic_state *state,
 286                           struct drm_crtc *crtc)
 287 {
 288         int ret, index = drm_crtc_index(crtc);
 289         struct drm_crtc_state *crtc_state;
 290
 291         WARN_ON(!state->acquire_ctx);
 292
 293         crtc_state = drm_atomic_get_existing_crtc_state(state, crtc);
 294         if (crtc_state)
 295                 return crtc_state;
 296
 297         ret = drm_modeset_lock(&crtc->mutex, state->acquire_ctx);
 298         if (ret)
 299                 return ERR_PTR(ret);
 300
 301         crtc_state = crtc->funcs->atomic_duplicate_state(crtc);
 302         if (!crtc_state)
 303                 return ERR_PTR(-ENOMEM);
 304
 305         state->crtcs[index].state = crtc_state;
 306         state->crtcs[index].old_state = crtc->state;
 307         state->crtcs[index].new_state = crtc_state;
 308         state->crtcs[index].ptr = crtc;
 309         crtc_state->state = state;
 310
 311         DRM_DEBUG_ATOMIC("Added [CRTC:%d:%s] %p state to %p\n",
 312                          crtc->base.id, crtc->name, crtc_state, state);
 313
 314         return crtc_state;
 315 }
 316 EXPORT_SYMBOL(drm_atomic_get_crtc_state);
 317
 318 static int drm_atomic_crtc_check(const struct drm_crtc_state *old_crtc_state,
 319                                  const struct drm_crtc_state *new_crtc_state)
 320 {
 321         struct drm_crtc *crtc = new_crtc_state->crtc;
 322
 323         /* NOTE: we explicitly don't enforce constraints such as primary
 324          * layer covering entire screen, since that is something we want
 325          * to allow (on hw that supports it).  For hw that does not, it
 326          * should be checked in driver's crtc->atomic_check() vfunc.
 327          *
 328          * TODO: Add generic modeset state checks once we support those.
 329          */
 330
 331         if (new_crtc_state->active && !new_crtc_state->enable) {
 332                 DRM_DEBUG_ATOMIC("[CRTC:%d:%s] active without enabled\n",
 333                                  crtc->base.id, crtc->name);
 334                 return -EINVAL;
 335         }
 336
 337         /* The state->enable vs. state->mode_blob checks can be WARN_ON,
 338          * as this is a kernel-internal detail that userspace should never
 339          * be able to trigger. */
 340         if (drm_core_check_feature(crtc->dev, DRIVER_ATOMIC) &&
 341             WARN_ON(new_crtc_state->enable && !new_crtc_state->mode_blob)) {
 342                 DRM_DEBUG_ATOMIC("[CRTC:%d:%s] enabled without mode blob\n",
 343                                  crtc->base.id, crtc->name);
 344                 return -EINVAL;
 345         }
 346
 347         if (drm_core_check_feature(crtc->dev, DRIVER_ATOMIC) &&
 348             WARN_ON(!new_crtc_state->enable && new_crtc_state->mode_blob)) {
 349                 DRM_DEBUG_ATOMIC("[CRTC:%d:%s] disabled with mode blob\n",
 350                                  crtc->base.id, crtc->name);
 351                 return -EINVAL;
 352         }
 353
 354         /*
 355          * Reject event generation for when a CRTC is off and stays off.
 356          * It wouldn't be hard to implement this, but userspace has a track
 357          * record of happily burning through 100% cpu (or worse, crash) when the
 358          * display pipe is suspended. To avoid all that fun just reject updates
 359          * that ask for events since likely that indicates a bug in the
 360          * compositor's drawing loop. This is consistent with the vblank IOCTL
 361          * and legacy page_flip IOCTL which also reject service on a disabled
 362          * pipe.
 363          */
 364         if (new_crtc_state->event &&
 365             !new_crtc_state->active && !old_crtc_state->active) {
 366                 DRM_DEBUG_ATOMIC("[CRTC:%d:%s] requesting event but off\n",
 367                                  crtc->base.id, crtc->name);
 368                 return -EINVAL;
 369         }
 370
 371         return 0;
 372 }
 373
 374 static void drm_atomic_crtc_print_state(struct drm_printer *p,
 375                 const struct drm_crtc_state *state)
 376 {
 377         struct drm_crtc *crtc = state->crtc;
 378
 379         drm_printf(p, "crtc[%u]: %s\n", crtc->base.id, crtc->name);
 380         drm_printf(p, "\tenable=%d\n", state->enable);
 381         drm_printf(p, "\tactive=%d\n", state->active);
 382         drm_printf(p, "\tplanes_changed=%d\n", state->planes_changed);
 383         drm_printf(p, "\tmode_changed=%d\n", state->mode_changed);
 384         drm_printf(p, "\tactive_changed=%d\n", state->active_changed);
 385         drm_printf(p, "\tconnectors_changed=%d\n", state->connectors_changed);
 386         drm_printf(p, "\tcolor_mgmt_changed=%d\n", state->color_mgmt_changed);
 387         drm_printf(p, "\tplane_mask=%x\n", state->plane_mask);
 388         drm_printf(p, "\tconnector_mask=%x\n", state->connector_mask);
 389         drm_printf(p, "\tencoder_mask=%x\n", state->encoder_mask);
 390         drm_printf(p, "\tmode: " DRM_MODE_FMT "\n", DRM_MODE_ARG(&state->mode));
 391
 392         if (crtc->funcs->atomic_print_state)
 393                 crtc->funcs->atomic_print_state(p, state);
 394 }
 395
 396 static int drm_atomic_connector_check(struct drm_connector *connector,
 397                 struct drm_connector_state *state)
 398 {
 399         struct drm_crtc_state *crtc_state;
 400         struct drm_writeback_job *writeback_job = state->writeback_job;
 401         const struct drm_display_info *info = &connector->display_info;
 402
 403         state->max_bpc = info->bpc ? info->bpc : 8;
 404         if (connector->max_bpc_property)
 405                 state->max_bpc = min(state->max_bpc, state->max_requested_bpc);
 406
 407         if ((connector->connector_type != DRM_MODE_CONNECTOR_WRITEBACK) || !writeback_job)
 408                 return 0;
 409
 410         if (writeback_job->fb && !state->crtc) {
 411                 DRM_DEBUG_ATOMIC("[CONNECTOR:%d:%s] framebuffer without CRTC\n",
 412                                  connector->base.id, connector->name);
 413                 return -EINVAL;
 414         }
 415
 416         if (state->crtc)
 417                 crtc_state = drm_atomic_get_existing_crtc_state(state->state,
 418                                                                 state->crtc);
 419
 420         if (writeback_job->fb && !crtc_state->active) {
 421                 DRM_DEBUG_ATOMIC("[CONNECTOR:%d:%s] has framebuffer, but [CRTC:%d] is off\n",
 422                                  connector->base.id, connector->name,
 423                                  state->crtc->base.id);
 424                 return -EINVAL;
 425         }
 426
 427         if (writeback_job->out_fence && !writeback_job->fb) {
 428                 DRM_DEBUG_ATOMIC("[CONNECTOR:%d:%s] requesting out-fence without framebuffer\n",
 429                                  connector->base.id, connector->name);
 430                 return -EINVAL;
 431         }
 432
 433         return 0;
 434 }
 435
 436 /**
 437  * drm_atomic_get_plane_state - get plane state
 438  * @state: global atomic state object
 439  * @plane: plane to get state object for
 440  *
 441  * This function returns the plane state for the given plane, allocating it if
 442  * needed. It will also grab the relevant plane lock to make sure that the state
 443  * is consistent.
 444  *
 445  * Returns:
 446  *
 447  * Either the allocated state or the error code encoded into the pointer. When
 448  * the error is EDEADLK then the w/w mutex code has detected a deadlock and the
 449  * entire atomic sequence must be restarted. All other errors are fatal.
 450  */
 451 struct drm_plane_state *
 452 drm_atomic_get_plane_state(struct drm_atomic_state *state,
 453                           struct drm_plane *plane)
 454 {
 455         int ret, index = drm_plane_index(plane);
 456         struct drm_plane_state *plane_state;
 457
 458         WARN_ON(!state->acquire_ctx);
 459
 460         /* the legacy pointers should never be set */
 461         WARN_ON(plane->fb);
 462         WARN_ON(plane->old_fb);
 463         WARN_ON(plane->crtc);
 464
 465         plane_state = drm_atomic_get_existing_plane_state(state, plane);
 466         if (plane_state)
 467                 return plane_state;
 468
 469         ret = drm_modeset_lock(&plane->mutex, state->acquire_ctx);
 470         if (ret)
 471                 return ERR_PTR(ret);
 472
 473         plane_state = plane->funcs->atomic_duplicate_state(plane);
 474         if (!plane_state)
 475                 return ERR_PTR(-ENOMEM);
 476
 477         state->planes[index].state = plane_state;
 478         state->planes[index].ptr = plane;
 479         state->planes[index].old_state = plane->state;
 480         state->planes[index].new_state = plane_state;
 481         plane_state->state = state;
 482
 483         DRM_DEBUG_ATOMIC("Added [PLANE:%d:%s] %p state to %p\n",
 484                          plane->base.id, plane->name, plane_state, state);
 485
 486         if (plane_state->crtc) {
 487                 struct drm_crtc_state *crtc_state;
 488
 489                 crtc_state = drm_atomic_get_crtc_state(state,
 490                                                        plane_state->crtc);
 491                 if (IS_ERR(crtc_state))
 492                         return ERR_CAST(crtc_state);
 493         }
 494
 495         return plane_state;
 496 }
 497 EXPORT_SYMBOL(drm_atomic_get_plane_state);
 498
 499 static bool
 500 plane_switching_crtc(const struct drm_plane_state *old_plane_state,
 501                      const struct drm_plane_state *new_plane_state)
 502 {
 503         if (!old_plane_state->crtc || !new_plane_state->crtc)
 504                 return false;
 505
 506         if (old_plane_state->crtc == new_plane_state->crtc)
 507                 return false;
 508
 509         /* This could be refined, but currently there's no helper or driver code
 510          * to implement direct switching of active planes nor userspace to take
 511          * advantage of more direct plane switching without the intermediate
 512          * full OFF state.
 513          */
 514         return true;
 515 }
 516
 517 /**
 518  * drm_atomic_plane_check - check plane state
 519  * @old_plane_state: old plane state to check
 520  * @new_plane_state: new plane state to check
 521  *
 522  * Provides core sanity checks for plane state.
 523  *
 524  * RETURNS:
 525  * Zero on success, error code on failure
 526  */
 527 static int drm_atomic_plane_check(const struct drm_plane_state *old_plane_state,
 528                                   const struct drm_plane_state *new_plane_state)
 529 {
 530         struct drm_plane *plane = new_plane_state->plane;
 531         struct drm_crtc *crtc = new_plane_state->crtc;
 532         const struct drm_framebuffer *fb = new_plane_state->fb;
 533         unsigned int fb_width, fb_height;
 534         int ret;
 535
 536         /* either *both* CRTC and FB must be set, or neither */
 537         if (crtc && !fb) {
 538                 DRM_DEBUG_ATOMIC("[PLANE:%d:%s] CRTC set but no FB\n",
 539                                  plane->base.id, plane->name);
 540                 return -EINVAL;
 541         } else if (fb && !crtc) {
 542                 DRM_DEBUG_ATOMIC("[PLANE:%d:%s] FB set but no CRTC\n",
 543                                  plane->base.id, plane->name);
 544                 return -EINVAL;
 545         }
 546
 547         /* if disabled, we don't care about the rest of the state: */
 548         if (!crtc)
 549                 return 0;
 550
 551         /* Check whether this plane is usable on this CRTC */
 552         if (!(plane->possible_crtcs & drm_crtc_mask(crtc))) {
 553                 DRM_DEBUG_ATOMIC("Invalid [CRTC:%d:%s] for [PLANE:%d:%s]\n",
 554                                  crtc->base.id, crtc->name,
 555                                  plane->base.id, plane->name);
 556                 return -EINVAL;
 557         }
 558
 559         /* Check whether this plane supports the fb pixel format. */
 560         ret = drm_plane_check_pixel_format(plane, fb->format->format,
 561                                            fb->modifier);
 562         if (ret) {
 563                 struct drm_format_name_buf format_name;
 564                 DRM_DEBUG_ATOMIC("[PLANE:%d:%s] invalid pixel format %s, modifier 0x%llx\n",
 565                                  plane->base.id, plane->name,
 566                                  drm_get_format_name(fb->format->format,
 567                                                      &format_name),
 568                                  fb->modifier);
 569                 return ret;
 570         }
 571
 572         /* Give drivers some help against integer overflows */
 573         if (new_plane_state->crtc_w > INT_MAX ||
 574             new_plane_state->crtc_x > INT_MAX - (int32_t) new_plane_state->crtc_w ||
 575             new_plane_state->crtc_h > INT_MAX ||
 576             new_plane_state->crtc_y > INT_MAX - (int32_t) new_plane_state->crtc_h) {
 577                 DRM_DEBUG_ATOMIC("[PLANE:%d:%s] invalid CRTC coordinates %ux%u+%d+%d\n",
 578                                  plane->base.id, plane->name,
 579                                  new_plane_state->crtc_w, new_plane_state->crtc_h,
 580                                  new_plane_state->crtc_x, new_plane_state->crtc_y);
 581                 return -ERANGE;
 582         }
 583
 584         fb_width = fb->width << 16;
 585         fb_height = fb->height << 16;
 586
 587         /* Make sure source coordinates are inside the fb. */
 588         if (new_plane_state->src_w > fb_width ||
 589             new_plane_state->src_x > fb_width - new_plane_state->src_w ||
 590             new_plane_state->src_h > fb_height ||
 591             new_plane_state->src_y > fb_height - new_plane_state->src_h) {
 592                 DRM_DEBUG_ATOMIC("[PLANE:%d:%s] invalid source coordinates "
 593                                  "%u.%06ux%u.%06u+%u.%06u+%u.%06u (fb %ux%u)\n",
 594                                  plane->base.id, plane->name,
 595                                  new_plane_state->src_w >> 16,
 596                                  ((new_plane_state->src_w & 0xffff) * 15625) >> 10,
 597                                  new_plane_state->src_h >> 16,
 598                                  ((new_plane_state->src_h & 0xffff) * 15625) >> 10,
 599                                  new_plane_state->src_x >> 16,
 600                                  ((new_plane_state->src_x & 0xffff) * 15625) >> 10,
 601                                  new_plane_state->src_y >> 16,
 602                                  ((new_plane_state->src_y & 0xffff) * 15625) >> 10,
 603                                  fb->width, fb->height);
 604                 return -ENOSPC;
 605         }
 606
 607         if (plane_switching_crtc(old_plane_state, new_plane_state)) {
 608                 DRM_DEBUG_ATOMIC("[PLANE:%d:%s] switching CRTC directly\n",
 609                                  plane->base.id, plane->name);
 610                 return -EINVAL;
 611         }
 612
 613         return 0;
 614 }
 615
 616 static void drm_atomic_plane_print_state(struct drm_printer *p,
 617                 const struct drm_plane_state *state)
 618 {
 619         struct drm_plane *plane = state->plane;
 620         struct drm_rect src  = drm_plane_state_src(state);
 621         struct drm_rect dest = drm_plane_state_dest(state);
 622
 623         drm_printf(p, "plane[%u]: %s\n", plane->base.id, plane->name);
 624         drm_printf(p, "\tcrtc=%s\n", state->crtc ? state->crtc->name : "(null)");
 625         drm_printf(p, "\tfb=%u\n", state->fb ? state->fb->base.id : 0);
 626         if (state->fb)
 627                 drm_framebuffer_print_info(p, 2, state->fb);
 628         drm_printf(p, "\tcrtc-pos=" DRM_RECT_FMT "\n", DRM_RECT_ARG(&dest));
 629         drm_printf(p, "\tsrc-pos=" DRM_RECT_FP_FMT "\n", DRM_RECT_FP_ARG(&src));
 630         drm_printf(p, "\trotation=%x\n", state->rotation);
 631         drm_printf(p, "\tnormalized-zpos=%x\n", state->normalized_zpos);
 632         drm_printf(p, "\tcolor-encoding=%s\n",
 633                    drm_get_color_encoding_name(state->color_encoding));
 634         drm_printf(p, "\tcolor-range=%s\n",
 635                    drm_get_color_range_name(state->color_range));
 636
 637         if (plane->funcs->atomic_print_state)
 638                 plane->funcs->atomic_print_state(p, state);
 639 }
 640
 641 /**
 642  * DOC: handling driver private state
 643  *
 644  * Very often the DRM objects exposed to userspace in the atomic modeset api
 645  * (&drm_connector, &drm_crtc and &drm_plane) do not map neatly to the
 646  * underlying hardware. Especially for any kind of shared resources (e.g. shared
 647  * clocks, scaler units, bandwidth and fifo limits shared among a group of
 648  * planes or CRTCs, and so on) it makes sense to model these as independent
 649  * objects. Drivers then need to do similar state tracking and commit ordering for
 650  * such private (since not exposed to userpace) objects as the atomic core and
 651  * helpers already provide for connectors, planes and CRTCs.
 652  *
 653  * To make this easier on drivers the atomic core provides some support to track
 654  * driver private state objects using struct &drm_private_obj, with the
 655  * associated state struct &drm_private_state.
 656  *
 657  * Similar to userspace-exposed objects, private state structures can be
 658  * acquired by calling drm_atomic_get_private_obj_state(). Since this function
 659  * does not take care of locking, drivers should wrap it for each type of
 660  * private state object they have with the required call to drm_modeset_lock()
 661  * for the corresponding &drm_modeset_lock.
 662  *
 663  * All private state structures contained in a &drm_atomic_state update can be
 664  * iterated using for_each_oldnew_private_obj_in_state(),
 665  * for_each_new_private_obj_in_state() and for_each_old_private_obj_in_state().
 666  * Drivers are recommended to wrap these for each type of driver private state
 667  * object they have, filtering on &drm_private_obj.funcs using for_each_if(), at
 668  * least if they want to iterate over all objects of a given type.
 669  *
 670  * An earlier way to handle driver private state was by subclassing struct
 671  * &drm_atomic_state. But since that encourages non-standard ways to implement
 672  * the check/commit split atomic requires (by using e.g. "check and rollback or
 673  * commit instead" of "duplicate state, check, then either commit or release
 674  * duplicated state) it is deprecated in favour of using &drm_private_state.
 675  */
 676
 677 /**
 678  * drm_atomic_private_obj_init - initialize private object
 679  * @dev: DRM device this object will be attached to
 680  * @obj: private object
 681  * @state: initial private object state
 682  * @funcs: pointer to the struct of function pointers that identify the object
 683  * type
 684  *
 685  * Initialize the private object, which can be embedded into any
 686  * driver private object that needs its own atomic state.
 687  */
 688 void
 689 drm_atomic_private_obj_init(struct drm_device *dev,
 690                             struct drm_private_obj *obj,
 691                             struct drm_private_state *state,
 692                             const struct drm_private_state_funcs *funcs)
 693 {
 694         memset(obj, 0, sizeof(*obj));
 695
 696         drm_modeset_lock_init(&obj->lock);
 697
 698         obj->state = state;
 699         obj->funcs = funcs;
 700         list_add_tail(&obj->head, &dev->mode_config.privobj_list);
 701 }
 702 EXPORT_SYMBOL(drm_atomic_private_obj_init);
 703
 704 /**
 705  * drm_atomic_private_obj_fini - finalize private object
 706  * @obj: private object
 707  *
 708  * Finalize the private object.
 709  */
 710 void
 711 drm_atomic_private_obj_fini(struct drm_private_obj *obj)
 712 {
 713         list_del(&obj->head);
 714         obj->funcs->atomic_destroy_state(obj, obj->state);
 715         drm_modeset_lock_fini(&obj->lock);
 716 }
 717 EXPORT_SYMBOL(drm_atomic_private_obj_fini);
 718
 719 /**
 720  * drm_atomic_get_private_obj_state - get private object state
 721  * @state: global atomic state
 722  * @obj: private object to get the state for
 723  *
 724  * This function returns the private object state for the given private object,
 725  * allocating the state if needed. It will also grab the relevant private
 726  * object lock to make sure that the state is consistent.
 727  *
 728  * RETURNS:
 729  *
 730  * Either the allocated state or the error code encoded into a pointer.
 731  */
 732 struct drm_private_state *
 733 drm_atomic_get_private_obj_state(struct drm_atomic_state *state,
 734                                  struct drm_private_obj *obj)
 735 {
 736         int index, num_objs, i, ret;
 737         size_t size;
 738         struct __drm_private_objs_state *arr;
 739         struct drm_private_state *obj_state;
 740
 741         for (i = 0; i < state->num_private_objs; i++)
 742                 if (obj == state->private_objs[i].ptr)
 743                         return state->private_objs[i].state;
 744
 745         ret = drm_modeset_lock(&obj->lock, state->acquire_ctx);
 746         if (ret)
 747                 return ERR_PTR(ret);
 748
 749         num_objs = state->num_private_objs + 1;
 750         size = sizeof(*state->private_objs) * num_objs;
 751         arr = krealloc(state->private_objs, size, GFP_KERNEL);
 752         if (!arr)
 753                 return ERR_PTR(-ENOMEM);
 754
 755         state->private_objs = arr;
 756         index = state->num_private_objs;
 757         memset(&state->private_objs[index], 0, sizeof(*state->private_objs));
 758
 759         obj_state = obj->funcs->atomic_duplicate_state(obj);
 760         if (!obj_state)
 761                 return ERR_PTR(-ENOMEM);
 762
 763         state->private_objs[index].state = obj_state;
 764         state->private_objs[index].old_state = obj->state;
 765         state->private_objs[index].new_state = obj_state;
 766         state->private_objs[index].ptr = obj;
 767         obj_state->state = state;
 768
 769         state->num_private_objs = num_objs;
 770
 771         DRM_DEBUG_ATOMIC("Added new private object %p state %p to %p\n",
 772                          obj, obj_state, state);
 773
 774         return obj_state;
 775 }
 776 EXPORT_SYMBOL(drm_atomic_get_private_obj_state);
 777
 778 /**
 779  * drm_atomic_get_connector_state - get connector state
 780  * @state: global atomic state object
 781  * @connector: connector to get state object for
 782  *
 783  * This function returns the connector state for the given connector,
 784  * allocating it if needed. It will also grab the relevant connector lock to
 785  * make sure that the state is consistent.
 786  *
 787  * Returns:
 788  *
 789  * Either the allocated state or the error code encoded into the pointer. When
 790  * the error is EDEADLK then the w/w mutex code has detected a deadlock and the
 791  * entire atomic sequence must be restarted. All other errors are fatal.
 792  */
 793 struct drm_connector_state *
 794 drm_atomic_get_connector_state(struct drm_atomic_state *state,
 795                           struct drm_connector *connector)
 796 {
 797         int ret, index;
 798         struct drm_mode_config *config = &connector->dev->mode_config;
 799         struct drm_connector_state *connector_state;
 800
 801         WARN_ON(!state->acquire_ctx);
 802
 803         ret = drm_modeset_lock(&config->connection_mutex, state->acquire_ctx);
 804         if (ret)
 805                 return ERR_PTR(ret);
 806
 807         index = drm_connector_index(connector);
 808
 809         if (index >= state->num_connector) {
 810                 struct __drm_connnectors_state *c;
 811                 int alloc = max(index + 1, config->num_connector);
 812
 813                 c = krealloc(state->connectors, alloc * sizeof(*state->connectors), GFP_KERNEL);
 814                 if (!c)
 815                         return ERR_PTR(-ENOMEM);
 816
 817                 state->connectors = c;
 818                 memset(&state->connectors[state->num_connector], 0,
 819                        sizeof(*state->connectors) * (alloc - state->num_connector));
 820
 821                 state->num_connector = alloc;
 822         }
 823
 824         if (state->connectors[index].state)
 825                 return state->connectors[index].state;
 826
 827         connector_state = connector->funcs->atomic_duplicate_state(connector);
 828         if (!connector_state)
 829                 return ERR_PTR(-ENOMEM);
 830
 831         drm_connector_get(connector);
 832         state->connectors[index].state = connector_state;
 833         state->connectors[index].old_state = connector->state;
 834         state->connectors[index].new_state = connector_state;
 835         state->connectors[index].ptr = connector;
 836         connector_state->state = state;
 837
 838         DRM_DEBUG_ATOMIC("Added [CONNECTOR:%d:%s] %p state to %p\n",
 839                          connector->base.id, connector->name,
 840                          connector_state, state);
 841
 842         if (connector_state->crtc) {
 843                 struct drm_crtc_state *crtc_state;
 844
 845                 crtc_state = drm_atomic_get_crtc_state(state,
 846                                                        connector_state->crtc);
 847                 if (IS_ERR(crtc_state))
 848                         return ERR_CAST(crtc_state);
 849         }
 850
 851         return connector_state;
 852 }
 853 EXPORT_SYMBOL(drm_atomic_get_connector_state);
 854
 855 static void drm_atomic_connector_print_state(struct drm_printer *p,
 856                 const struct drm_connector_state *state)
 857 {
 858         struct drm_connector *connector = state->connector;
 859
 860         drm_printf(p, "connector[%u]: %s\n", connector->base.id, connector->name);
 861         drm_printf(p, "\tcrtc=%s\n", state->crtc ? state->crtc->name : "(null)");
 862
 863         if (connector->connector_type == DRM_MODE_CONNECTOR_WRITEBACK)
 864                 if (state->writeback_job && state->writeback_job->fb)
 865                         drm_printf(p, "\tfb=%d\n", state->writeback_job->fb->base.id);
 866
 867         if (connector->funcs->atomic_print_state)
 868                 connector->funcs->atomic_print_state(p, state);
 869 }
 870
 871 /**
 872  * drm_atomic_add_affected_connectors - add connectors for crtc
 873  * @state: atomic state
 874  * @crtc: DRM crtc
 875  *
 876  * This function walks the current configuration and adds all connectors
 877  * currently using @crtc to the atomic configuration @state. Note that this
 878  * function must acquire the connection mutex. This can potentially cause
 879  * unneeded seralization if the update is just for the planes on one crtc. Hence
 880  * drivers and helpers should only call this when really needed (e.g. when a
 881  * full modeset needs to happen due to some change).
 882  *
 883  * Returns:
 884  * 0 on success or can fail with -EDEADLK or -ENOMEM. When the error is EDEADLK
 885  * then the w/w mutex code has detected a deadlock and the entire atomic
 886  * sequence must be restarted. All other errors are fatal.
 887  */
 888 int
 889 drm_atomic_add_affected_connectors(struct drm_atomic_state *state,
 890                                    struct drm_crtc *crtc)
 891 {
 892         struct drm_mode_config *config = &state->dev->mode_config;
 893         struct drm_connector *connector;
 894         struct drm_connector_state *conn_state;
 895         struct drm_connector_list_iter conn_iter;
 896         struct drm_crtc_state *crtc_state;
 897         int ret;
 898
 899         crtc_state = drm_atomic_get_crtc_state(state, crtc);
 900         if (IS_ERR(crtc_state))
 901                 return PTR_ERR(crtc_state);
 902
 903         ret = drm_modeset_lock(&config->connection_mutex, state->acquire_ctx);
 904         if (ret)
 905                 return ret;
 906
 907         DRM_DEBUG_ATOMIC("Adding all current connectors for [CRTC:%d:%s] to %p\n",
 908                          crtc->base.id, crtc->name, state);
 909
 910         /*
 911          * Changed connectors are already in @state, so only need to look
 912          * at the connector_mask in crtc_state.
 913          */
 914         drm_connector_list_iter_begin(state->dev, &conn_iter);
 915         drm_for_each_connector_iter(connector, &conn_iter) {
 916                 if (!(crtc_state->connector_mask & drm_connector_mask(connector)))
 917                         continue;
 918
 919                 conn_state = drm_atomic_get_connector_state(state, connector);
 920                 if (IS_ERR(conn_state)) {
 921                         drm_connector_list_iter_end(&conn_iter);
 922                         return PTR_ERR(conn_state);
 923                 }
 924         }
 925         drm_connector_list_iter_end(&conn_iter);
 926
 927         return 0;
 928 }
 929 EXPORT_SYMBOL(drm_atomic_add_affected_connectors);
 930
 931 /**
 932  * drm_atomic_add_affected_planes - add planes for crtc
 933  * @state: atomic state
 934  * @crtc: DRM crtc
 935  *
 936  * This function walks the current configuration and adds all planes
 937  * currently used by @crtc to the atomic configuration @state. This is useful
 938  * when an atomic commit also needs to check all currently enabled plane on
 939  * @crtc, e.g. when changing the mode. It's also useful when re-enabling a CRTC
 940  * to avoid special code to force-enable all planes.
 941  *
 942  * Since acquiring a plane state will always also acquire the w/w mutex of the
 943  * current CRTC for that plane (if there is any) adding all the plane states for
 944  * a CRTC will not reduce parallism of atomic updates.
 945  *
 946  * Returns:
 947  * 0 on success or can fail with -EDEADLK or -ENOMEM. When the error is EDEADLK
 948  * then the w/w mutex code has detected a deadlock and the entire atomic
 949  * sequence must be restarted. All other errors are fatal.
 950  */
 951 int
 952 drm_atomic_add_affected_planes(struct drm_atomic_state *state,
 953                                struct drm_crtc *crtc)
 954 {
 955         const struct drm_crtc_state *old_crtc_state =
 956                 drm_atomic_get_old_crtc_state(state, crtc);
 957         struct drm_plane *plane;
 958
 959         WARN_ON(!drm_atomic_get_new_crtc_state(state, crtc));
 960
 961         DRM_DEBUG_ATOMIC("Adding all current planes for [CRTC:%d:%s] to %p\n",
 962                          crtc->base.id, crtc->name, state);
 963
 964         drm_for_each_plane_mask(plane, state->dev, old_crtc_state->plane_mask) {
 965                 struct drm_plane_state *plane_state =
 966                         drm_atomic_get_plane_state(state, plane);
 967
 968                 if (IS_ERR(plane_state))
 969                         return PTR_ERR(plane_state);
 970         }
 971         return 0;
 972 }
 973 EXPORT_SYMBOL(drm_atomic_add_affected_planes);
 974
 975 /**
 976  * drm_atomic_check_only - check whether a given config would work
 977  * @state: atomic configuration to check
 978  *
 979  * Note that this function can return -EDEADLK if the driver needed to acquire
 980  * more locks but encountered a deadlock. The caller must then do the usual w/w
 981  * backoff dance and restart. All other errors are fatal.
 982  *
 983  * Returns:
 984  * 0 on success, negative error code on failure.
 985  */
 986 int drm_atomic_check_only(struct drm_atomic_state *state)
 987 {
 988         struct drm_device *dev = state->dev;
 989         struct drm_mode_config *config = &dev->mode_config;
 990         struct drm_plane *plane;
 991         struct drm_plane_state *old_plane_state;
 992         struct drm_plane_state *new_plane_state;
 993         struct drm_crtc *crtc;
 994         struct drm_crtc_state *old_crtc_state;
 995         struct drm_crtc_state *new_crtc_state;
 996         struct drm_connector *conn;
 997         struct drm_connector_state *conn_state;
 998         int i, ret = 0;
 999
1000         DRM_DEBUG_ATOMIC("checking %p\n", state);
1001
1002         for_each_oldnew_plane_in_state(state, plane, old_plane_state, new_plane_state, i) {
1003                 ret = drm_atomic_plane_check(old_plane_state, new_plane_state);
1004                 if (ret) {
1005                         DRM_DEBUG_ATOMIC("[PLANE:%d:%s] atomic core check failed\n",
1006                                          plane->base.id, plane->name);
1007                         return ret;
1008                 }
1009         }
1010
1011         for_each_oldnew_crtc_in_state(state, crtc, old_crtc_state, new_crtc_state, i) {
1012                 ret = drm_atomic_crtc_check(old_crtc_state, new_crtc_state);
1013                 if (ret) {
1014                         DRM_DEBUG_ATOMIC("[CRTC:%d:%s] atomic core check failed\n",
1015                                          crtc->base.id, crtc->name);
1016                         return ret;
1017                 }
1018         }
1019
1020         for_each_new_connector_in_state(state, conn, conn_state, i) {
1021                 ret = drm_atomic_connector_check(conn, conn_state);
1022                 if (ret) {
1023                         DRM_DEBUG_ATOMIC("[CONNECTOR:%d:%s] atomic core check failed\n",
1024                                          conn->base.id, conn->name);
1025                         return ret;
1026                 }
1027         }
1028
1029         if (config->funcs->atomic_check) {
1030                 ret = config->funcs->atomic_check(state->dev, state);
1031
1032                 if (ret) {
1033                         DRM_DEBUG_ATOMIC("atomic driver check for %p failed: %d\n",
1034                                          state, ret);
1035                         return ret;
1036                 }
1037         }
1038
1039         if (!state->allow_modeset) {
1040                 for_each_new_crtc_in_state(state, crtc, new_crtc_state, i) {
1041                         if (drm_atomic_crtc_needs_modeset(new_crtc_state)) {
1042                                 DRM_DEBUG_ATOMIC("[CRTC:%d:%s] requires full modeset\n",
1043                                                  crtc->base.id, crtc->name);
1044                                 return -EINVAL;
1045                         }
1046                 }
1047         }
1048
1049         return 0;
1050 }
1051 EXPORT_SYMBOL(drm_atomic_check_only);
1052
1053 /**
1054  * drm_atomic_commit - commit configuration atomically
1055  * @state: atomic configuration to check
1056  *
1057  * Note that this function can return -EDEADLK if the driver needed to acquire
1058  * more locks but encountered a deadlock. The caller must then do the usual w/w
1059  * backoff dance and restart. All other errors are fatal.
1060  *
1061  * This function will take its own reference on @state.
1062  * Callers should always release their reference with drm_atomic_state_put().
1063  *
1064  * Returns:
1065  * 0 on success, negative error code on failure.
1066  */
1067 int drm_atomic_commit(struct drm_atomic_state *state)
1068 {
1069         struct drm_mode_config *config = &state->dev->mode_config;
1070         int ret;
1071
1072         ret = drm_atomic_check_only(state);
1073         if (ret)
1074                 return ret;
1075
1076         DRM_DEBUG_ATOMIC("committing %p\n", state);
1077
1078         return config->funcs->atomic_commit(state->dev, state, false);
1079 }
1080 EXPORT_SYMBOL(drm_atomic_commit);
1081
1082 /**
1083  * drm_atomic_nonblocking_commit - atomic nonblocking commit
1084  * @state: atomic configuration to check
1085  *
1086  * Note that this function can return -EDEADLK if the driver needed to acquire
1087  * more locks but encountered a deadlock. The caller must then do the usual w/w
1088  * backoff dance and restart. All other errors are fatal.
1089  *
1090  * This function will take its own reference on @state.
1091  * Callers should always release their reference with drm_atomic_state_put().
1092  *
1093  * Returns:
1094  * 0 on success, negative error code on failure.
1095  */
1096 int drm_atomic_nonblocking_commit(struct drm_atomic_state *state)
1097 {
1098         struct drm_mode_config *config = &state->dev->mode_config;
1099         int ret;
1100
1101         ret = drm_atomic_check_only(state);
1102         if (ret)
1103                 return ret;
1104
1105         DRM_DEBUG_ATOMIC("committing %p nonblocking\n", state);
1106
1107         return config->funcs->atomic_commit(state->dev, state, true);
1108 }
1109 EXPORT_SYMBOL(drm_atomic_nonblocking_commit);
1110
1111 void drm_atomic_print_state(const struct drm_atomic_state *state)
1112 {
1113         struct drm_printer p = drm_info_printer(state->dev->dev);
1114         struct drm_plane *plane;
1115         struct drm_plane_state *plane_state;
1116         struct drm_crtc *crtc;
1117         struct drm_crtc_state *crtc_state;
1118         struct drm_connector *connector;
1119         struct drm_connector_state *connector_state;
1120         int i;
1121
1122         DRM_DEBUG_ATOMIC("checking %p\n", state);
1123
1124         for_each_new_plane_in_state(state, plane, plane_state, i)
1125                 drm_atomic_plane_print_state(&p, plane_state);
1126
1127         for_each_new_crtc_in_state(state, crtc, crtc_state, i)
1128                 drm_atomic_crtc_print_state(&p, crtc_state);
1129
1130         for_each_new_connector_in_state(state, connector, connector_state, i)
1131                 drm_atomic_connector_print_state(&p, connector_state);
1132 }
1133
1134 static void __drm_state_dump(struct drm_device *dev, struct drm_printer *p,
1135                              bool take_locks)
1136 {
1137         struct drm_mode_config *config = &dev->mode_config;
1138         struct drm_plane *plane;
1139         struct drm_crtc *crtc;
1140         struct drm_connector *connector;
1141         struct drm_connector_list_iter conn_iter;
1142
1143         if (!drm_drv_uses_atomic_modeset(dev))
1144                 return;
1145
1146         list_for_each_entry(plane, &config->plane_list, head) {
1147                 if (take_locks)
1148                         drm_modeset_lock(&plane->mutex, NULL);
1149                 drm_atomic_plane_print_state(p, plane->state);
1150                 if (take_locks)
1151                         drm_modeset_unlock(&plane->mutex);
1152         }
1153
1154         list_for_each_entry(crtc, &config->crtc_list, head) {
1155                 if (take_locks)
1156                         drm_modeset_lock(&crtc->mutex, NULL);
1157                 drm_atomic_crtc_print_state(p, crtc->state);
1158                 if (take_locks)
1159                         drm_modeset_unlock(&crtc->mutex);
1160         }
1161
1162         drm_connector_list_iter_begin(dev, &conn_iter);
1163         if (take_locks)
1164                 drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
1165         drm_for_each_connector_iter(connector, &conn_iter)
1166                 drm_atomic_connector_print_state(p, connector->state);
1167         if (take_locks)
1168                 drm_modeset_unlock(&dev->mode_config.connection_mutex);
1169         drm_connector_list_iter_end(&conn_iter);
1170 }
1171
1172 /**
1173  * drm_state_dump - dump entire device atomic state
1174  * @dev: the drm device
1175  * @p: where to print the state to
1176  *
1177  * Just for debugging.  Drivers might want an option to dump state
1178  * to dmesg in case of error irq's.  (Hint, you probably want to
1179  * ratelimit this!)
1180  *
1181  * The caller must drm_modeset_lock_all(), or if this is called
1182  * from error irq handler, it should not be enabled by default.
1183  * (Ie. if you are debugging errors you might not care that this
1184  * is racey.  But calling this without all modeset locks held is
1185  * not inherently safe.)
1186  */
1187 void drm_state_dump(struct drm_device *dev, struct drm_printer *p)
1188 {
1189         __drm_state_dump(dev, p, false);
1190 }
1191 EXPORT_SYMBOL(drm_state_dump);
1192
1193 #ifdef CONFIG_DEBUG_FS
1194 static int drm_state_info(struct seq_file *m, void *data)
1195 {
1196         struct drm_info_node *node = (struct drm_info_node *) m->private;
1197         struct drm_device *dev = node->minor->dev;
1198         struct drm_printer p = drm_seq_file_printer(m);
1199
1200         __drm_state_dump(dev, &p, true);
1201
1202         return 0;
1203 }
1204
1205 /* any use in debugfs files to dump individual planes/crtc/etc? */
1206 static const struct drm_info_list drm_atomic_debugfs_list[] = {
1207         {"state", drm_state_info, 0},
1208 };
1209
1210 int drm_atomic_debugfs_init(struct drm_minor *minor)
1211 {
1212         return drm_debugfs_create_files(drm_atomic_debugfs_list,
1213                         ARRAY_SIZE(drm_atomic_debugfs_list),
1214                         minor->debugfs_root, minor);
1215 }
1216 #endif
1217