drivers/gpu/drm/drm_crtc.c

   1 /*
   2  * Copyright (c) 2006-2008 Intel Corporation
   3  * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
   4  * Copyright (c) 2008 Red Hat Inc.
   5  *
   6  * DRM core CRTC related functions
   7  *
   8  * Permission to use, copy, modify, distribute, and sell this software and its
   9  * documentation for any purpose is hereby granted without fee, provided that
  10  * the above copyright notice appear in all copies and that both that copyright
  11  * notice and this permission notice appear in supporting documentation, and
  12  * that the name of the copyright holders not be used in advertising or
  13  * publicity pertaining to distribution of the software without specific,
  14  * written prior permission.  The copyright holders make no representations
  15  * about the suitability of this software for any purpose.  It is provided "as
  16  * is" without express or implied warranty.
  17  *
  18  * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
  19  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
  20  * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
  21  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
  22  * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  23  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
  24  * OF THIS SOFTWARE.
  25  *
  26  * Authors:
  27  *      Keith Packard
  28  *      Eric Anholt <eric@anholt.net>
  29  *      Dave Airlie <airlied@linux.ie>
  30  *      Jesse Barnes <jesse.barnes@intel.com>
  31  */
  32 #include <linux/ctype.h>
  33 #include <linux/list.h>
  34 #include <linux/slab.h>
  35 #include <linux/export.h>
  36 #include <linux/dma-fence.h>
  37 #include <drm/drmP.h>
  38 #include <drm/drm_crtc.h>
  39 #include <drm/drm_edid.h>
  40 #include <drm/drm_fourcc.h>
  41 #include <drm/drm_modeset_lock.h>
  42 #include <drm/drm_atomic.h>
  43 #include <drm/drm_auth.h>
  44 #include <drm/drm_debugfs_crc.h>
  45
  46 #include "drm_crtc_internal.h"
  47 #include "drm_internal.h"
  48
  49 /**
  50  * DOC: overview
  51  *
  52  * A CRTC represents the overall display pipeline. It receives pixel data from
  53  * &drm_plane and blends them together. The &drm_display_mode is also attached
  54  * to the CRTC, specifying display timings. On the output side the data is fed
  55  * to one or more &drm_encoder, which are then each connected to one
  56  * &drm_connector.
  57  *
  58  * To create a CRTC, a KMS drivers allocates and zeroes an instances of
  59  * &struct drm_crtc (possibly as part of a larger structure) and registers it
  60  * with a call to drm_crtc_init_with_planes().
  61  *
  62  * The CRTC is also the entry point for legacy modeset operations, see
  63  * &drm_crtc_funcs.set_config, legacy plane operations, see
  64  * &drm_crtc_funcs.page_flip and &drm_crtc_funcs.cursor_set2, and other legacy
  65  * operations like &drm_crtc_funcs.gamma_set. For atomic drivers all these
  66  * features are controlled through &drm_property and
  67  * &drm_mode_config_funcs.atomic_check and &drm_mode_config_funcs.atomic_check.
  68  */
  69
  70 /**
  71  * drm_crtc_from_index - find the registered CRTC at an index
  72  * @dev: DRM device
  73  * @idx: index of registered CRTC to find for
  74  *
  75  * Given a CRTC index, return the registered CRTC from DRM device's
  76  * list of CRTCs with matching index. This is the inverse of drm_crtc_index().
  77  * It's useful in the vblank callbacks (like &drm_driver.enable_vblank or
  78  * &drm_driver.disable_vblank), since that still deals with indices instead
  79  * of pointers to &struct drm_crtc."
  80  */
  81 struct drm_crtc *drm_crtc_from_index(struct drm_device *dev, int idx)
  82 {
  83         struct drm_crtc *crtc;
  84
  85         drm_for_each_crtc(crtc, dev)
  86                 if (idx == crtc->index)
  87                         return crtc;
  88
  89         return NULL;
  90 }
  91 EXPORT_SYMBOL(drm_crtc_from_index);
  92
  93 /**
  94  * drm_crtc_force_disable - Forcibly turn off a CRTC
  95  * @crtc: CRTC to turn off
  96  *
  97  * Note: This should only be used by non-atomic legacy drivers.
  98  *
  99  * Returns:
 100  * Zero on success, error code on failure.
 101  */
 102 int drm_crtc_force_disable(struct drm_crtc *crtc)
 103 {
 104         struct drm_mode_set set = {
 105                 .crtc = crtc,
 106         };
 107
 108         WARN_ON(drm_drv_uses_atomic_modeset(crtc->dev));
 109
 110         return drm_mode_set_config_internal(&set);
 111 }
 112 EXPORT_SYMBOL(drm_crtc_force_disable);
 113
 114 /**
 115  * drm_crtc_force_disable_all - Forcibly turn off all enabled CRTCs
 116  * @dev: DRM device whose CRTCs to turn off
 117  *
 118  * Drivers may want to call this on unload to ensure that all displays are
 119  * unlit and the GPU is in a consistent, low power state. Takes modeset locks.
 120  *
 121  * Note: This should only be used by non-atomic legacy drivers. For an atomic
 122  * version look at drm_atomic_helper_shutdown().
 123  *
 124  * Returns:
 125  * Zero on success, error code on failure.
 126  */
 127 int drm_crtc_force_disable_all(struct drm_device *dev)
 128 {
 129         struct drm_crtc *crtc;
 130         int ret = 0;
 131
 132         drm_modeset_lock_all(dev);
 133         drm_for_each_crtc(crtc, dev)
 134                 if (crtc->enabled) {
 135                         ret = drm_crtc_force_disable(crtc);
 136                         if (ret)
 137                                 goto out;
 138                 }
 139 out:
 140         drm_modeset_unlock_all(dev);
 141         return ret;
 142 }
 143 EXPORT_SYMBOL(drm_crtc_force_disable_all);
 144
 145 static unsigned int drm_num_crtcs(struct drm_device *dev)
 146 {
 147         unsigned int num = 0;
 148         struct drm_crtc *tmp;
 149
 150         drm_for_each_crtc(tmp, dev) {
 151                 num++;
 152         }
 153
 154         return num;
 155 }
 156
 157 int drm_crtc_register_all(struct drm_device *dev)
 158 {
 159         struct drm_crtc *crtc;
 160         int ret = 0;
 161
 162         drm_for_each_crtc(crtc, dev) {
 163                 if (drm_debugfs_crtc_add(crtc))
 164                         DRM_ERROR("Failed to initialize debugfs entry for CRTC '%s'.\n",
 165                                   crtc->name);
 166
 167                 if (crtc->funcs->late_register)
 168                         ret = crtc->funcs->late_register(crtc);
 169                 if (ret)
 170                         return ret;
 171         }
 172
 173         return 0;
 174 }
 175
 176 void drm_crtc_unregister_all(struct drm_device *dev)
 177 {
 178         struct drm_crtc *crtc;
 179
 180         drm_for_each_crtc(crtc, dev) {
 181                 if (crtc->funcs->early_unregister)
 182                         crtc->funcs->early_unregister(crtc);
 183                 drm_debugfs_crtc_remove(crtc);
 184         }
 185 }
 186
 187 static int drm_crtc_crc_init(struct drm_crtc *crtc)
 188 {
 189 #ifdef CONFIG_DEBUG_FS
 190         spin_lock_init(&crtc->crc.lock);
 191         init_waitqueue_head(&crtc->crc.wq);
 192         crtc->crc.source = kstrdup("auto", GFP_KERNEL);
 193         if (!crtc->crc.source)
 194                 return -ENOMEM;
 195 #endif
 196         return 0;
 197 }
 198
 199 static void drm_crtc_crc_fini(struct drm_crtc *crtc)
 200 {
 201 #ifdef CONFIG_DEBUG_FS
 202         kfree(crtc->crc.source);
 203 #endif
 204 }
 205
 206 static const struct dma_fence_ops drm_crtc_fence_ops;
 207
 208 static struct drm_crtc *fence_to_crtc(struct dma_fence *fence)
 209 {
 210         BUG_ON(fence->ops != &drm_crtc_fence_ops);
 211         return container_of(fence->lock, struct drm_crtc, fence_lock);
 212 }
 213
 214 static const char *drm_crtc_fence_get_driver_name(struct dma_fence *fence)
 215 {
 216         struct drm_crtc *crtc = fence_to_crtc(fence);
 217
 218         return crtc->dev->driver->name;
 219 }
 220
 221 static const char *drm_crtc_fence_get_timeline_name(struct dma_fence *fence)
 222 {
 223         struct drm_crtc *crtc = fence_to_crtc(fence);
 224
 225         return crtc->timeline_name;
 226 }
 227
 228 static const struct dma_fence_ops drm_crtc_fence_ops = {
 229         .get_driver_name = drm_crtc_fence_get_driver_name,
 230         .get_timeline_name = drm_crtc_fence_get_timeline_name,
 231 };
 232
 233 struct dma_fence *drm_crtc_create_fence(struct drm_crtc *crtc)
 234 {
 235         struct dma_fence *fence;
 236
 237         fence = kzalloc(sizeof(*fence), GFP_KERNEL);
 238         if (!fence)
 239                 return NULL;
 240
 241         dma_fence_init(fence, &drm_crtc_fence_ops, &crtc->fence_lock,
 242                        crtc->fence_context, ++crtc->fence_seqno);
 243
 244         return fence;
 245 }
 246
 247 /**
 248  * drm_crtc_init_with_planes - Initialise a new CRTC object with
 249  *    specified primary and cursor planes.
 250  * @dev: DRM device
 251  * @crtc: CRTC object to init
 252  * @primary: Primary plane for CRTC
 253  * @cursor: Cursor plane for CRTC
 254  * @funcs: callbacks for the new CRTC
 255  * @name: printf style format string for the CRTC name, or NULL for default name
 256  *
 257  * Inits a new object created as base part of a driver crtc object. Drivers
 258  * should use this function instead of drm_crtc_init(), which is only provided
 259  * for backwards compatibility with drivers which do not yet support universal
 260  * planes). For really simple hardware which has only 1 plane look at
 261  * drm_simple_display_pipe_init() instead.
 262  *
 263  * Returns:
 264  * Zero on success, error code on failure.
 265  */
 266 int drm_crtc_init_with_planes(struct drm_device *dev, struct drm_crtc *crtc,
 267                               struct drm_plane *primary,
 268                               struct drm_plane *cursor,
 269                               const struct drm_crtc_funcs *funcs,
 270                               const char *name, ...)
 271 {
 272         struct drm_mode_config *config = &dev->mode_config;
 273         int ret;
 274
 275         WARN_ON(primary && primary->type != DRM_PLANE_TYPE_PRIMARY);
 276         WARN_ON(cursor && cursor->type != DRM_PLANE_TYPE_CURSOR);
 277
 278         /* crtc index is used with 32bit bitmasks */
 279         if (WARN_ON(config->num_crtc >= 32))
 280                 return -EINVAL;
 281
 282         WARN_ON(drm_drv_uses_atomic_modeset(dev) &&
 283                 (!funcs->atomic_destroy_state ||
 284                  !funcs->atomic_duplicate_state));
 285
 286         crtc->dev = dev;
 287         crtc->funcs = funcs;
 288
 289         INIT_LIST_HEAD(&crtc->commit_list);
 290         spin_lock_init(&crtc->commit_lock);
 291
 292         drm_modeset_lock_init(&crtc->mutex);
 293         ret = drm_mode_object_add(dev, &crtc->base, DRM_MODE_OBJECT_CRTC);
 294         if (ret)
 295                 return ret;
 296
 297         if (name) {
 298                 va_list ap;
 299
 300                 va_start(ap, name);
 301                 crtc->name = kvasprintf(GFP_KERNEL, name, ap);
 302                 va_end(ap);
 303         } else {
 304                 crtc->name = kasprintf(GFP_KERNEL, "crtc-%d",
 305                                        drm_num_crtcs(dev));
 306         }
 307         if (!crtc->name) {
 308                 drm_mode_object_unregister(dev, &crtc->base);
 309                 return -ENOMEM;
 310         }
 311
 312         crtc->fence_context = dma_fence_context_alloc(1);
 313         spin_lock_init(&crtc->fence_lock);
 314         snprintf(crtc->timeline_name, sizeof(crtc->timeline_name),
 315                  "CRTC:%d-%s", crtc->base.id, crtc->name);
 316
 317         crtc->base.properties = &crtc->properties;
 318
 319         list_add_tail(&crtc->head, &config->crtc_list);
 320         crtc->index = config->num_crtc++;
 321
 322         crtc->primary = primary;
 323         crtc->cursor = cursor;
 324         if (primary && !primary->possible_crtcs)
 325                 primary->possible_crtcs = drm_crtc_mask(crtc);
 326         if (cursor && !cursor->possible_crtcs)
 327                 cursor->possible_crtcs = drm_crtc_mask(crtc);
 328
 329         ret = drm_crtc_crc_init(crtc);
 330         if (ret) {
 331                 drm_mode_object_unregister(dev, &crtc->base);
 332                 return ret;
 333         }
 334
 335         if (drm_core_check_feature(dev, DRIVER_ATOMIC)) {
 336                 drm_object_attach_property(&crtc->base, config->prop_active, 0);
 337                 drm_object_attach_property(&crtc->base, config->prop_mode_id, 0);
 338                 drm_object_attach_property(&crtc->base,
 339                                            config->prop_out_fence_ptr, 0);
 340         }
 341
 342         return 0;
 343 }
 344 EXPORT_SYMBOL(drm_crtc_init_with_planes);
 345
 346 /**
 347  * drm_crtc_cleanup - Clean up the core crtc usage
 348  * @crtc: CRTC to cleanup
 349  *
 350  * This function cleans up @crtc and removes it from the DRM mode setting
 351  * core. Note that the function does *not* free the crtc structure itself,
 352  * this is the responsibility of the caller.
 353  */
 354 void drm_crtc_cleanup(struct drm_crtc *crtc)
 355 {
 356         struct drm_device *dev = crtc->dev;
 357
 358         /* Note that the crtc_list is considered to be static; should we
 359          * remove the drm_crtc at runtime we would have to decrement all
 360          * the indices on the drm_crtc after us in the crtc_list.
 361          */
 362
 363         drm_crtc_crc_fini(crtc);
 364
 365         kfree(crtc->gamma_store);
 366         crtc->gamma_store = NULL;
 367
 368         drm_modeset_lock_fini(&crtc->mutex);
 369
 370         drm_mode_object_unregister(dev, &crtc->base);
 371         list_del(&crtc->head);
 372         dev->mode_config.num_crtc--;
 373
 374         WARN_ON(crtc->state && !crtc->funcs->atomic_destroy_state);
 375         if (crtc->state && crtc->funcs->atomic_destroy_state)
 376                 crtc->funcs->atomic_destroy_state(crtc, crtc->state);
 377
 378         kfree(crtc->name);
 379
 380         memset(crtc, 0, sizeof(*crtc));
 381 }
 382 EXPORT_SYMBOL(drm_crtc_cleanup);
 383
 384 /**
 385  * drm_mode_getcrtc - get CRTC configuration
 386  * @dev: drm device for the ioctl
 387  * @data: data pointer for the ioctl
 388  * @file_priv: drm file for the ioctl call
 389  *
 390  * Construct a CRTC configuration structure to return to the user.
 391  *
 392  * Called by the user via ioctl.
 393  *
 394  * Returns:
 395  * Zero on success, negative errno on failure.
 396  */
 397 int drm_mode_getcrtc(struct drm_device *dev,
 398                      void *data, struct drm_file *file_priv)
 399 {
 400         struct drm_mode_crtc *crtc_resp = data;
 401         struct drm_crtc *crtc;
 402         struct drm_plane *plane;
 403
 404         if (!drm_core_check_feature(dev, DRIVER_MODESET))
 405                 return -EINVAL;
 406
 407         crtc = drm_crtc_find(dev, file_priv, crtc_resp->crtc_id);
 408         if (!crtc)
 409                 return -ENOENT;
 410
 411         plane = crtc->primary;
 412
 413         crtc_resp->gamma_size = crtc->gamma_size;
 414
 415         drm_modeset_lock(&plane->mutex, NULL);
 416         if (plane->state && plane->state->fb)
 417                 crtc_resp->fb_id = plane->state->fb->base.id;
 418         else if (!plane->state && plane->fb)
 419                 crtc_resp->fb_id = plane->fb->base.id;
 420         else
 421                 crtc_resp->fb_id = 0;
 422
 423         if (plane->state) {
 424                 crtc_resp->x = plane->state->src_x >> 16;
 425                 crtc_resp->y = plane->state->src_y >> 16;
 426         }
 427         drm_modeset_unlock(&plane->mutex);
 428
 429         drm_modeset_lock(&crtc->mutex, NULL);
 430         if (crtc->state) {
 431                 if (crtc->state->enable) {
 432                         drm_mode_convert_to_umode(&crtc_resp->mode, &crtc->state->mode);
 433                         crtc_resp->mode_valid = 1;
 434                 } else {
 435                         crtc_resp->mode_valid = 0;
 436                 }
 437         } else {
 438                 crtc_resp->x = crtc->x;
 439                 crtc_resp->y = crtc->y;
 440
 441                 if (crtc->enabled) {
 442                         drm_mode_convert_to_umode(&crtc_resp->mode, &crtc->mode);
 443                         crtc_resp->mode_valid = 1;
 444
 445                 } else {
 446                         crtc_resp->mode_valid = 0;
 447                 }
 448         }
 449         if (!file_priv->aspect_ratio_allowed)
 450                 crtc_resp->mode.flags &= ~DRM_MODE_FLAG_PIC_AR_MASK;
 451         drm_modeset_unlock(&crtc->mutex);
 452
 453         return 0;
 454 }
 455
 456 static int __drm_mode_set_config_internal(struct drm_mode_set *set,
 457                                           struct drm_modeset_acquire_ctx *ctx)
 458 {
 459         struct drm_crtc *crtc = set->crtc;
 460         struct drm_framebuffer *fb;
 461         struct drm_crtc *tmp;
 462         int ret;
 463
 464         WARN_ON(drm_drv_uses_atomic_modeset(crtc->dev));
 465
 466         /*
 467          * NOTE: ->set_config can also disable other crtcs (if we steal all
 468          * connectors from it), hence we need to refcount the fbs across all
 469          * crtcs. Atomic modeset will have saner semantics ...
 470          */
 471         drm_for_each_crtc(tmp, crtc->dev) {
 472                 struct drm_plane *plane = tmp->primary;
 473
 474                 plane->old_fb = plane->fb;
 475         }
 476
 477         fb = set->fb;
 478
 479         ret = crtc->funcs->set_config(set, ctx);
 480         if (ret == 0) {
 481                 struct drm_plane *plane = crtc->primary;
 482
 483                 plane->crtc = fb ? crtc : NULL;
 484                 plane->fb = fb;
 485         }
 486
 487         drm_for_each_crtc(tmp, crtc->dev) {
 488                 struct drm_plane *plane = tmp->primary;
 489
 490                 if (plane->fb)
 491                         drm_framebuffer_get(plane->fb);
 492                 if (plane->old_fb)
 493                         drm_framebuffer_put(plane->old_fb);
 494                 plane->old_fb = NULL;
 495         }
 496
 497         return ret;
 498 }
 499
 500 /**
 501  * drm_mode_set_config_internal - helper to call &drm_mode_config_funcs.set_config
 502  * @set: modeset config to set
 503  *
 504  * This is a little helper to wrap internal calls to the
 505  * &drm_mode_config_funcs.set_config driver interface. The only thing it adds is
 506  * correct refcounting dance.
 507  *
 508  * This should only be used by non-atomic legacy drivers.
 509  *
 510  * Returns:
 511  * Zero on success, negative errno on failure.
 512  */
 513 int drm_mode_set_config_internal(struct drm_mode_set *set)
 514 {
 515         WARN_ON(drm_drv_uses_atomic_modeset(set->crtc->dev));
 516
 517         return __drm_mode_set_config_internal(set, NULL);
 518 }
 519 EXPORT_SYMBOL(drm_mode_set_config_internal);
 520
 521 /**
 522  * drm_crtc_check_viewport - Checks that a framebuffer is big enough for the
 523  *     CRTC viewport
 524  * @crtc: CRTC that framebuffer will be displayed on
 525  * @x: x panning
 526  * @y: y panning
 527  * @mode: mode that framebuffer will be displayed under
 528  * @fb: framebuffer to check size of
 529  */
 530 int drm_crtc_check_viewport(const struct drm_crtc *crtc,
 531                             int x, int y,
 532                             const struct drm_display_mode *mode,
 533                             const struct drm_framebuffer *fb)
 534
 535 {
 536         int hdisplay, vdisplay;
 537
 538         drm_mode_get_hv_timing(mode, &hdisplay, &vdisplay);
 539
 540         if (crtc->state &&
 541             drm_rotation_90_or_270(crtc->primary->state->rotation))
 542                 swap(hdisplay, vdisplay);
 543
 544         return drm_framebuffer_check_src_coords(x << 16, y << 16,
 545                                                 hdisplay << 16, vdisplay << 16,
 546                                                 fb);
 547 }
 548 EXPORT_SYMBOL(drm_crtc_check_viewport);
 549
 550 /**
 551  * drm_mode_setcrtc - set CRTC configuration
 552  * @dev: drm device for the ioctl
 553  * @data: data pointer for the ioctl
 554  * @file_priv: drm file for the ioctl call
 555  *
 556  * Build a new CRTC configuration based on user request.
 557  *
 558  * Called by the user via ioctl.
 559  *
 560  * Returns:
 561  * Zero on success, negative errno on failure.
 562  */
 563 int drm_mode_setcrtc(struct drm_device *dev, void *data,
 564                      struct drm_file *file_priv)
 565 {
 566         struct drm_mode_config *config = &dev->mode_config;
 567         struct drm_mode_crtc *crtc_req = data;
 568         struct drm_crtc *crtc;
 569         struct drm_plane *plane;
 570         struct drm_connector **connector_set = NULL, *connector;
 571         struct drm_framebuffer *fb = NULL;
 572         struct drm_display_mode *mode = NULL;
 573         struct drm_mode_set set;
 574         uint32_t __user *set_connectors_ptr;
 575         struct drm_modeset_acquire_ctx ctx;
 576         int ret;
 577         int i;
 578
 579         if (!drm_core_check_feature(dev, DRIVER_MODESET))
 580                 return -EINVAL;
 581
 582         /*
 583          * Universal plane src offsets are only 16.16, prevent havoc for
 584          * drivers using universal plane code internally.
 585          */
 586         if (crtc_req->x & 0xffff0000 || crtc_req->y & 0xffff0000)
 587                 return -ERANGE;
 588
 589         crtc = drm_crtc_find(dev, file_priv, crtc_req->crtc_id);
 590         if (!crtc) {
 591                 DRM_DEBUG_KMS("Unknown CRTC ID %d\n", crtc_req->crtc_id);
 592                 return -ENOENT;
 593         }
 594         DRM_DEBUG_KMS("[CRTC:%d:%s]\n", crtc->base.id, crtc->name);
 595
 596         plane = crtc->primary;
 597
 598         mutex_lock(&crtc->dev->mode_config.mutex);
 599         drm_modeset_acquire_init(&ctx, DRM_MODESET_ACQUIRE_INTERRUPTIBLE);
 600 retry:
 601         ret = drm_modeset_lock_all_ctx(crtc->dev, &ctx);
 602         if (ret)
 603                 goto out;
 604
 605         if (crtc_req->mode_valid) {
 606                 /* If we have a mode we need a framebuffer. */
 607                 /* If we pass -1, set the mode with the currently bound fb */
 608                 if (crtc_req->fb_id == -1) {
 609                         struct drm_framebuffer *old_fb;
 610
 611                         if (plane->state)
 612                                 old_fb = plane->state->fb;
 613                         else
 614                                 old_fb = plane->fb;
 615
 616                         if (!old_fb) {
 617                                 DRM_DEBUG_KMS("CRTC doesn't have current FB\n");
 618                                 ret = -EINVAL;
 619                                 goto out;
 620                         }
 621
 622                         fb = old_fb;
 623                         /* Make refcounting symmetric with the lookup path. */
 624                         drm_framebuffer_get(fb);
 625                 } else {
 626                         fb = drm_framebuffer_lookup(dev, file_priv, crtc_req->fb_id);
 627                         if (!fb) {
 628                                 DRM_DEBUG_KMS("Unknown FB ID%d\n",
 629                                                 crtc_req->fb_id);
 630                                 ret = -ENOENT;
 631                                 goto out;
 632                         }
 633                 }
 634
 635                 mode = drm_mode_create(dev);
 636                 if (!mode) {
 637                         ret = -ENOMEM;
 638                         goto out;
 639                 }
 640                 if (!file_priv->aspect_ratio_allowed &&
 641                     (crtc_req->mode.flags & DRM_MODE_FLAG_PIC_AR_MASK) != DRM_MODE_FLAG_PIC_AR_NONE) {
 642                         DRM_DEBUG_KMS("Unexpected aspect-ratio flag bits\n");
 643                         ret = -EINVAL;
 644                         goto out;
 645                 }
 646
 647
 648                 ret = drm_mode_convert_umode(dev, mode, &crtc_req->mode);
 649                 if (ret) {
 650                         DRM_DEBUG_KMS("Invalid mode (ret=%d, status=%s)\n",
 651                                       ret, drm_get_mode_status_name(mode->status));
 652                         drm_mode_debug_printmodeline(mode);
 653                         goto out;
 654                 }
 655
 656                 /*
 657                  * Check whether the primary plane supports the fb pixel format.
 658                  * Drivers not implementing the universal planes API use a
 659                  * default formats list provided by the DRM core which doesn't
 660                  * match real hardware capabilities. Skip the check in that
 661                  * case.
 662                  */
 663                 if (!plane->format_default) {
 664                         ret = drm_plane_check_pixel_format(plane,
 665                                                            fb->format->format,
 666                                                            fb->modifier);
 667                         if (ret) {
 668                                 struct drm_format_name_buf format_name;
 669                                 DRM_DEBUG_KMS("Invalid pixel format %s, modifier 0x%llx\n",
 670                                               drm_get_format_name(fb->format->format,
 671                                                                   &format_name),
 672                                               fb->modifier);
 673                                 goto out;
 674                         }
 675                 }
 676
 677                 ret = drm_crtc_check_viewport(crtc, crtc_req->x, crtc_req->y,
 678                                               mode, fb);
 679                 if (ret)
 680                         goto out;
 681
 682         }
 683
 684         if (crtc_req->count_connectors == 0 && mode) {
 685                 DRM_DEBUG_KMS("Count connectors is 0 but mode set\n");
 686                 ret = -EINVAL;
 687                 goto out;
 688         }
 689
 690         if (crtc_req->count_connectors > 0 && (!mode || !fb)) {
 691                 DRM_DEBUG_KMS("Count connectors is %d but no mode or fb set\n",
 692                           crtc_req->count_connectors);
 693                 ret = -EINVAL;
 694                 goto out;
 695         }
 696
 697         if (crtc_req->count_connectors > 0) {
 698                 u32 out_id;
 699
 700                 /* Avoid unbounded kernel memory allocation */
 701                 if (crtc_req->count_connectors > config->num_connector) {
 702                         ret = -EINVAL;
 703                         goto out;
 704                 }
 705
 706                 connector_set = kmalloc_array(crtc_req->count_connectors,
 707                                               sizeof(struct drm_connector *),
 708                                               GFP_KERNEL);
 709                 if (!connector_set) {
 710                         ret = -ENOMEM;
 711                         goto out;
 712                 }
 713
 714                 for (i = 0; i < crtc_req->count_connectors; i++) {
 715                         connector_set[i] = NULL;
 716                         set_connectors_ptr = (uint32_t __user *)(unsigned long)crtc_req->set_connectors_ptr;
 717                         if (get_user(out_id, &set_connectors_ptr[i])) {
 718                                 ret = -EFAULT;
 719                                 goto out;
 720                         }
 721
 722                         connector = drm_connector_lookup(dev, file_priv, out_id);
 723                         if (!connector) {
 724                                 DRM_DEBUG_KMS("Connector id %d unknown\n",
 725                                                 out_id);
 726                                 ret = -ENOENT;
 727                                 goto out;
 728                         }
 729                         DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n",
 730                                         connector->base.id,
 731                                         connector->name);
 732
 733                         connector_set[i] = connector;
 734                 }
 735         }
 736
 737         set.crtc = crtc;
 738         set.x = crtc_req->x;
 739         set.y = crtc_req->y;
 740         set.mode = mode;
 741         set.connectors = connector_set;
 742         set.num_connectors = crtc_req->count_connectors;
 743         set.fb = fb;
 744
 745         if (drm_drv_uses_atomic_modeset(dev))
 746                 ret = crtc->funcs->set_config(&set, &ctx);
 747         else
 748                 ret = __drm_mode_set_config_internal(&set, &ctx);
 749
 750 out:
 751         if (fb)
 752                 drm_framebuffer_put(fb);
 753
 754         if (connector_set) {
 755                 for (i = 0; i < crtc_req->count_connectors; i++) {
 756                         if (connector_set[i])
 757                                 drm_connector_put(connector_set[i]);
 758                 }
 759         }
 760         kfree(connector_set);
 761         drm_mode_destroy(dev, mode);
 762         if (ret == -EDEADLK) {
 763                 ret = drm_modeset_backoff(&ctx);
 764                 if (!ret)
 765                         goto retry;
 766         }
 767         drm_modeset_drop_locks(&ctx);
 768         drm_modeset_acquire_fini(&ctx);
 769         mutex_unlock(&crtc->dev->mode_config.mutex);
 770
 771         return ret;
 772 }
 773
 774 int drm_mode_crtc_set_obj_prop(struct drm_mode_object *obj,
 775                                struct drm_property *property,
 776                                uint64_t value)
 777 {
 778         int ret = -EINVAL;
 779         struct drm_crtc *crtc = obj_to_crtc(obj);
 780
 781         if (crtc->funcs->set_property)
 782                 ret = crtc->funcs->set_property(crtc, property, value);
 783         if (!ret)
 784                 drm_object_property_set_value(obj, property, value);
 785
 786         return ret;
 787 }