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 <linux/uaccess.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 #include <drm/drm_drv.h>
  46 #include <drm/drm_print.h>
  47 #include <drm/drm_file.h>
  48
  49 #include "drm_crtc_internal.h"
  50 #include "drm_internal.h"
  51
  52 /**
  53  * DOC: overview
  54  *
  55  * A CRTC represents the overall display pipeline. It receives pixel data from
  56  * &drm_plane and blends them together. The &drm_display_mode is also attached
  57  * to the CRTC, specifying display timings. On the output side the data is fed
  58  * to one or more &drm_encoder, which are then each connected to one
  59  * &drm_connector.
  60  *
  61  * To create a CRTC, a KMS drivers allocates and zeroes an instances of
  62  * &struct drm_crtc (possibly as part of a larger structure) and registers it
  63  * with a call to drm_crtc_init_with_planes().
  64  *
  65  * The CRTC is also the entry point for legacy modeset operations, see
  66  * &drm_crtc_funcs.set_config, legacy plane operations, see
  67  * &drm_crtc_funcs.page_flip and &drm_crtc_funcs.cursor_set2, and other legacy
  68  * operations like &drm_crtc_funcs.gamma_set. For atomic drivers all these
  69  * features are controlled through &drm_property and
  70  * &drm_mode_config_funcs.atomic_check and &drm_mode_config_funcs.atomic_check.
  71  */
  72
  73 /**
  74  * drm_crtc_from_index - find the registered CRTC at an index
  75  * @dev: DRM device
  76  * @idx: index of registered CRTC to find for
  77  *
  78  * Given a CRTC index, return the registered CRTC from DRM device's
  79  * list of CRTCs with matching index. This is the inverse of drm_crtc_index().
  80  * It's useful in the vblank callbacks (like &drm_driver.enable_vblank or
  81  * &drm_driver.disable_vblank), since that still deals with indices instead
  82  * of pointers to &struct drm_crtc."
  83  */
  84 struct drm_crtc *drm_crtc_from_index(struct drm_device *dev, int idx)
  85 {
  86         struct drm_crtc *crtc;
  87
  88         drm_for_each_crtc(crtc, dev)
  89                 if (idx == crtc->index)
  90                         return crtc;
  91
  92         return NULL;
  93 }
  94 EXPORT_SYMBOL(drm_crtc_from_index);
  95
  96 int drm_crtc_force_disable(struct drm_crtc *crtc)
  97 {
  98         struct drm_mode_set set = {
  99                 .crtc = crtc,
 100         };
 101
 102         WARN_ON(drm_drv_uses_atomic_modeset(crtc->dev));
 103
 104         return drm_mode_set_config_internal(&set);
 105 }
 106
 107 static unsigned int drm_num_crtcs(struct drm_device *dev)
 108 {
 109         unsigned int num = 0;
 110         struct drm_crtc *tmp;
 111
 112         drm_for_each_crtc(tmp, dev) {
 113                 num++;
 114         }
 115
 116         return num;
 117 }
 118
 119 int drm_crtc_register_all(struct drm_device *dev)
 120 {
 121         struct drm_crtc *crtc;
 122         int ret = 0;
 123
 124         drm_for_each_crtc(crtc, dev) {
 125                 drm_debugfs_crtc_add(crtc);
 126
 127                 if (crtc->funcs->late_register)
 128                         ret = crtc->funcs->late_register(crtc);
 129                 if (ret)
 130                         return ret;
 131         }
 132
 133         return 0;
 134 }
 135
 136 void drm_crtc_unregister_all(struct drm_device *dev)
 137 {
 138         struct drm_crtc *crtc;
 139
 140         drm_for_each_crtc(crtc, dev) {
 141                 if (crtc->funcs->early_unregister)
 142                         crtc->funcs->early_unregister(crtc);
 143                 drm_debugfs_crtc_remove(crtc);
 144         }
 145 }
 146
 147 static int drm_crtc_crc_init(struct drm_crtc *crtc)
 148 {
 149 #ifdef CONFIG_DEBUG_FS
 150         spin_lock_init(&crtc->crc.lock);
 151         init_waitqueue_head(&crtc->crc.wq);
 152         crtc->crc.source = kstrdup("auto", GFP_KERNEL);
 153         if (!crtc->crc.source)
 154                 return -ENOMEM;
 155 #endif
 156         return 0;
 157 }
 158
 159 static void drm_crtc_crc_fini(struct drm_crtc *crtc)
 160 {
 161 #ifdef CONFIG_DEBUG_FS
 162         kfree(crtc->crc.source);
 163 #endif
 164 }
 165
 166 static const struct dma_fence_ops drm_crtc_fence_ops;
 167
 168 static struct drm_crtc *fence_to_crtc(struct dma_fence *fence)
 169 {
 170         BUG_ON(fence->ops != &drm_crtc_fence_ops);
 171         return container_of(fence->lock, struct drm_crtc, fence_lock);
 172 }
 173
 174 static const char *drm_crtc_fence_get_driver_name(struct dma_fence *fence)
 175 {
 176         struct drm_crtc *crtc = fence_to_crtc(fence);
 177
 178         return crtc->dev->driver->name;
 179 }
 180
 181 static const char *drm_crtc_fence_get_timeline_name(struct dma_fence *fence)
 182 {
 183         struct drm_crtc *crtc = fence_to_crtc(fence);
 184
 185         return crtc->timeline_name;
 186 }
 187
 188 static const struct dma_fence_ops drm_crtc_fence_ops = {
 189         .get_driver_name = drm_crtc_fence_get_driver_name,
 190         .get_timeline_name = drm_crtc_fence_get_timeline_name,
 191 };
 192
 193 struct dma_fence *drm_crtc_create_fence(struct drm_crtc *crtc)
 194 {
 195         struct dma_fence *fence;
 196
 197         fence = kzalloc(sizeof(*fence), GFP_KERNEL);
 198         if (!fence)
 199                 return NULL;
 200
 201         dma_fence_init(fence, &drm_crtc_fence_ops, &crtc->fence_lock,
 202                        crtc->fence_context, ++crtc->fence_seqno);
 203
 204         return fence;
 205 }
 206
 207 /**
 208  * DOC: standard CRTC properties
 209  *
 210  * DRM CRTCs have a few standardized properties:
 211  *
 212  * ACTIVE:
 213  *      Atomic property for setting the power state of the CRTC. When set to 1
 214  *      the CRTC will actively display content. When set to 0 the CRTC will be
 215  *      powered off. There is no expectation that user-space will reset CRTC
 216  *      resources like the mode and planes when setting ACTIVE to 0.
 217  *
 218  *      User-space can rely on an ACTIVE change to 1 to never fail an atomic
 219  *      test as long as no other property has changed. If a change to ACTIVE
 220  *      fails an atomic test, this is a driver bug. For this reason setting
 221  *      ACTIVE to 0 must not release internal resources (like reserved memory
 222  *      bandwidth or clock generators).
 223  *
 224  *      Note that the legacy DPMS property on connectors is internally routed
 225  *      to control this property for atomic drivers.
 226  * MODE_ID:
 227  *      Atomic property for setting the CRTC display timings. The value is the
 228  *      ID of a blob containing the DRM mode info. To disable the CRTC,
 229  *      user-space must set this property to 0.
 230  *
 231  *      Setting MODE_ID to 0 will release reserved resources for the CRTC.
 232  * SCALING_FILTER:
 233  *      Atomic property for setting the scaling filter for CRTC scaler
 234  *
 235  *      The value of this property can be one of the following:
 236  *
 237  *      Default:
 238  *              Driver's default scaling filter
 239  *      Nearest Neighbor:
 240  *              Nearest Neighbor scaling filter
 241  */
 242
 243 /**
 244  * drm_crtc_init_with_planes - Initialise a new CRTC object with
 245  *    specified primary and cursor planes.
 246  * @dev: DRM device
 247  * @crtc: CRTC object to init
 248  * @primary: Primary plane for CRTC
 249  * @cursor: Cursor plane for CRTC
 250  * @funcs: callbacks for the new CRTC
 251  * @name: printf style format string for the CRTC name, or NULL for default name
 252  *
 253  * Inits a new object created as base part of a driver crtc object. Drivers
 254  * should use this function instead of drm_crtc_init(), which is only provided
 255  * for backwards compatibility with drivers which do not yet support universal
 256  * planes). For really simple hardware which has only 1 plane look at
 257  * drm_simple_display_pipe_init() instead.
 258  *
 259  * Returns:
 260  * Zero on success, error code on failure.
 261  */
 262 int drm_crtc_init_with_planes(struct drm_device *dev, struct drm_crtc *crtc,
 263                               struct drm_plane *primary,
 264                               struct drm_plane *cursor,
 265                               const struct drm_crtc_funcs *funcs,
 266                               const char *name, ...)
 267 {
 268         struct drm_mode_config *config = &dev->mode_config;
 269         int ret;
 270
 271         WARN_ON(primary && primary->type != DRM_PLANE_TYPE_PRIMARY);
 272         WARN_ON(cursor && cursor->type != DRM_PLANE_TYPE_CURSOR);
 273
 274         /* crtc index is used with 32bit bitmasks */
 275         if (WARN_ON(config->num_crtc >= 32))
 276                 return -EINVAL;
 277
 278         WARN_ON(drm_drv_uses_atomic_modeset(dev) &&
 279                 (!funcs->atomic_destroy_state ||
 280                  !funcs->atomic_duplicate_state));
 281
 282         crtc->dev = dev;
 283         crtc->funcs = funcs;
 284
 285         INIT_LIST_HEAD(&crtc->commit_list);
 286         spin_lock_init(&crtc->commit_lock);
 287
 288         drm_modeset_lock_init(&crtc->mutex);
 289         ret = drm_mode_object_add(dev, &crtc->base, DRM_MODE_OBJECT_CRTC);
 290         if (ret)
 291                 return ret;
 292
 293         if (name) {
 294                 va_list ap;
 295
 296                 va_start(ap, name);
 297                 crtc->name = kvasprintf(GFP_KERNEL, name, ap);
 298                 va_end(ap);
 299         } else {
 300                 crtc->name = kasprintf(GFP_KERNEL, "crtc-%d",
 301                                        drm_num_crtcs(dev));
 302         }
 303         if (!crtc->name) {
 304                 drm_mode_object_unregister(dev, &crtc->base);
 305                 return -ENOMEM;
 306         }
 307
 308         crtc->fence_context = dma_fence_context_alloc(1);
 309         spin_lock_init(&crtc->fence_lock);
 310         snprintf(crtc->timeline_name, sizeof(crtc->timeline_name),
 311                  "CRTC:%d-%s", crtc->base.id, crtc->name);
 312
 313         crtc->base.properties = &crtc->properties;
 314
 315         list_add_tail(&crtc->head, &config->crtc_list);
 316         crtc->index = config->num_crtc++;
 317
 318         crtc->primary = primary;
 319         crtc->cursor = cursor;
 320         if (primary && !primary->possible_crtcs)
 321                 primary->possible_crtcs = drm_crtc_mask(crtc);
 322         if (cursor && !cursor->possible_crtcs)
 323                 cursor->possible_crtcs = drm_crtc_mask(crtc);
 324
 325         ret = drm_crtc_crc_init(crtc);
 326         if (ret) {
 327                 drm_mode_object_unregister(dev, &crtc->base);
 328                 return ret;
 329         }
 330
 331         if (drm_core_check_feature(dev, DRIVER_ATOMIC)) {
 332                 drm_object_attach_property(&crtc->base, config->prop_active, 0);
 333                 drm_object_attach_property(&crtc->base, config->prop_mode_id, 0);
 334                 drm_object_attach_property(&crtc->base,
 335                                            config->prop_out_fence_ptr, 0);
 336                 drm_object_attach_property(&crtc->base,
 337                                            config->prop_vrr_enabled, 0);
 338         }
 339
 340         return 0;
 341 }
 342 EXPORT_SYMBOL(drm_crtc_init_with_planes);
 343
 344 /**
 345  * drm_crtc_cleanup - Clean up the core crtc usage
 346  * @crtc: CRTC to cleanup
 347  *
 348  * This function cleans up @crtc and removes it from the DRM mode setting
 349  * core. Note that the function does *not* free the crtc structure itself,
 350  * this is the responsibility of the caller.
 351  */
 352 void drm_crtc_cleanup(struct drm_crtc *crtc)
 353 {
 354         struct drm_device *dev = crtc->dev;
 355
 356         /* Note that the crtc_list is considered to be static; should we
 357          * remove the drm_crtc at runtime we would have to decrement all
 358          * the indices on the drm_crtc after us in the crtc_list.
 359          */
 360
 361         drm_crtc_crc_fini(crtc);
 362
 363         kfree(crtc->gamma_store);
 364         crtc->gamma_store = NULL;
 365
 366         drm_modeset_lock_fini(&crtc->mutex);
 367
 368         drm_mode_object_unregister(dev, &crtc->base);
 369         list_del(&crtc->head);
 370         dev->mode_config.num_crtc--;
 371
 372         WARN_ON(crtc->state && !crtc->funcs->atomic_destroy_state);
 373         if (crtc->state && crtc->funcs->atomic_destroy_state)
 374                 crtc->funcs->atomic_destroy_state(crtc, crtc->state);
 375
 376         kfree(crtc->name);
 377
 378         memset(crtc, 0, sizeof(*crtc));
 379 }
 380 EXPORT_SYMBOL(drm_crtc_cleanup);
 381
 382 /**
 383  * drm_mode_getcrtc - get CRTC configuration
 384  * @dev: drm device for the ioctl
 385  * @data: data pointer for the ioctl
 386  * @file_priv: drm file for the ioctl call
 387  *
 388  * Construct a CRTC configuration structure to return to the user.
 389  *
 390  * Called by the user via ioctl.
 391  *
 392  * Returns:
 393  * Zero on success, negative errno on failure.
 394  */
 395 int drm_mode_getcrtc(struct drm_device *dev,
 396                      void *data, struct drm_file *file_priv)
 397 {
 398         struct drm_mode_crtc *crtc_resp = data;
 399         struct drm_crtc *crtc;
 400         struct drm_plane *plane;
 401
 402         if (!drm_core_check_feature(dev, DRIVER_MODESET))
 403                 return -EOPNOTSUPP;
 404
 405         crtc = drm_crtc_find(dev, file_priv, crtc_resp->crtc_id);
 406         if (!crtc)
 407                 return -ENOENT;
 408
 409         plane = crtc->primary;
 410
 411         crtc_resp->gamma_size = crtc->gamma_size;
 412
 413         drm_modeset_lock(&plane->mutex, NULL);
 414         if (plane->state && plane->state->fb)
 415                 crtc_resp->fb_id = plane->state->fb->base.id;
 416         else if (!plane->state && plane->fb)
 417                 crtc_resp->fb_id = plane->fb->base.id;
 418         else
 419                 crtc_resp->fb_id = 0;
 420
 421         if (plane->state) {
 422                 crtc_resp->x = plane->state->src_x >> 16;
 423                 crtc_resp->y = plane->state->src_y >> 16;
 424         }
 425         drm_modeset_unlock(&plane->mutex);
 426
 427         drm_modeset_lock(&crtc->mutex, NULL);
 428         if (crtc->state) {
 429                 if (crtc->state->enable) {
 430                         drm_mode_convert_to_umode(&crtc_resp->mode, &crtc->state->mode);
 431                         crtc_resp->mode_valid = 1;
 432                 } else {
 433                         crtc_resp->mode_valid = 0;
 434                 }
 435         } else {
 436                 crtc_resp->x = crtc->x;
 437                 crtc_resp->y = crtc->y;
 438
 439                 if (crtc->enabled) {
 440                         drm_mode_convert_to_umode(&crtc_resp->mode, &crtc->mode);
 441                         crtc_resp->mode_valid = 1;
 442
 443                 } else {
 444                         crtc_resp->mode_valid = 0;
 445                 }
 446         }
 447         if (!file_priv->aspect_ratio_allowed)
 448                 crtc_resp->mode.flags &= ~DRM_MODE_FLAG_PIC_AR_MASK;
 449         drm_modeset_unlock(&crtc->mutex);
 450
 451         return 0;
 452 }
 453
 454 static int __drm_mode_set_config_internal(struct drm_mode_set *set,
 455                                           struct drm_modeset_acquire_ctx *ctx)
 456 {
 457         struct drm_crtc *crtc = set->crtc;
 458         struct drm_framebuffer *fb;
 459         struct drm_crtc *tmp;
 460         int ret;
 461
 462         WARN_ON(drm_drv_uses_atomic_modeset(crtc->dev));
 463
 464         /*
 465          * NOTE: ->set_config can also disable other crtcs (if we steal all
 466          * connectors from it), hence we need to refcount the fbs across all
 467          * crtcs. Atomic modeset will have saner semantics ...
 468          */
 469         drm_for_each_crtc(tmp, crtc->dev) {
 470                 struct drm_plane *plane = tmp->primary;
 471
 472                 plane->old_fb = plane->fb;
 473         }
 474
 475         fb = set->fb;
 476
 477         ret = crtc->funcs->set_config(set, ctx);
 478         if (ret == 0) {
 479                 struct drm_plane *plane = crtc->primary;
 480
 481                 plane->crtc = fb ? crtc : NULL;
 482                 plane->fb = fb;
 483         }
 484
 485         drm_for_each_crtc(tmp, crtc->dev) {
 486                 struct drm_plane *plane = tmp->primary;
 487
 488                 if (plane->fb)
 489                         drm_framebuffer_get(plane->fb);
 490                 if (plane->old_fb)
 491                         drm_framebuffer_put(plane->old_fb);
 492                 plane->old_fb = NULL;
 493         }
 494
 495         return ret;
 496 }
 497
 498 /**
 499  * drm_mode_set_config_internal - helper to call &drm_mode_config_funcs.set_config
 500  * @set: modeset config to set
 501  *
 502  * This is a little helper to wrap internal calls to the
 503  * &drm_mode_config_funcs.set_config driver interface. The only thing it adds is
 504  * correct refcounting dance.
 505  *
 506  * This should only be used by non-atomic legacy drivers.
 507  *
 508  * Returns:
 509  * Zero on success, negative errno on failure.
 510  */
 511 int drm_mode_set_config_internal(struct drm_mode_set *set)
 512 {
 513         WARN_ON(drm_drv_uses_atomic_modeset(set->crtc->dev));
 514
 515         return __drm_mode_set_config_internal(set, NULL);
 516 }
 517 EXPORT_SYMBOL(drm_mode_set_config_internal);
 518
 519 /**
 520  * drm_crtc_check_viewport - Checks that a framebuffer is big enough for the
 521  *     CRTC viewport
 522  * @crtc: CRTC that framebuffer will be displayed on
 523  * @x: x panning
 524  * @y: y panning
 525  * @mode: mode that framebuffer will be displayed under
 526  * @fb: framebuffer to check size of
 527  */
 528 int drm_crtc_check_viewport(const struct drm_crtc *crtc,
 529                             int x, int y,
 530                             const struct drm_display_mode *mode,
 531                             const struct drm_framebuffer *fb)
 532
 533 {
 534         int hdisplay, vdisplay;
 535
 536         drm_mode_get_hv_timing(mode, &hdisplay, &vdisplay);
 537
 538         if (crtc->state &&
 539             drm_rotation_90_or_270(crtc->primary->state->rotation))
 540                 swap(hdisplay, vdisplay);
 541
 542         return drm_framebuffer_check_src_coords(x << 16, y << 16,
 543                                                 hdisplay << 16, vdisplay << 16,
 544                                                 fb);
 545 }
 546 EXPORT_SYMBOL(drm_crtc_check_viewport);
 547
 548 /**
 549  * drm_mode_setcrtc - set CRTC configuration
 550  * @dev: drm device for the ioctl
 551  * @data: data pointer for the ioctl
 552  * @file_priv: drm file for the ioctl call
 553  *
 554  * Build a new CRTC configuration based on user request.
 555  *
 556  * Called by the user via ioctl.
 557  *
 558  * Returns:
 559  * Zero on success, negative errno on failure.
 560  */
 561 int drm_mode_setcrtc(struct drm_device *dev, void *data,
 562                      struct drm_file *file_priv)
 563 {
 564         struct drm_mode_config *config = &dev->mode_config;
 565         struct drm_mode_crtc *crtc_req = data;
 566         struct drm_crtc *crtc;
 567         struct drm_plane *plane;
 568         struct drm_connector **connector_set = NULL, *connector;
 569         struct drm_framebuffer *fb = NULL;
 570         struct drm_display_mode *mode = NULL;
 571         struct drm_mode_set set;
 572         uint32_t __user *set_connectors_ptr;
 573         struct drm_modeset_acquire_ctx ctx;
 574         int ret;
 575         int i;
 576
 577         if (!drm_core_check_feature(dev, DRIVER_MODESET))
 578                 return -EOPNOTSUPP;
 579
 580         /*
 581          * Universal plane src offsets are only 16.16, prevent havoc for
 582          * drivers using universal plane code internally.
 583          */
 584         if (crtc_req->x & 0xffff0000 || crtc_req->y & 0xffff0000)
 585                 return -ERANGE;
 586
 587         crtc = drm_crtc_find(dev, file_priv, crtc_req->crtc_id);
 588         if (!crtc) {
 589                 DRM_DEBUG_KMS("Unknown CRTC ID %d\n", crtc_req->crtc_id);
 590                 return -ENOENT;
 591         }
 592         DRM_DEBUG_KMS("[CRTC:%d:%s]\n", crtc->base.id, crtc->name);
 593
 594         plane = crtc->primary;
 595
 596         /* allow disabling with the primary plane leased */
 597         if (crtc_req->mode_valid && !drm_lease_held(file_priv, plane->base.id))
 598                 return -EACCES;
 599
 600         DRM_MODESET_LOCK_ALL_BEGIN(dev, ctx,
 601                                    DRM_MODESET_ACQUIRE_INTERRUPTIBLE, ret);
 602
 603         if (crtc_req->mode_valid) {
 604                 /* If we have a mode we need a framebuffer. */
 605                 /* If we pass -1, set the mode with the currently bound fb */
 606                 if (crtc_req->fb_id == -1) {
 607                         struct drm_framebuffer *old_fb;
 608
 609                         if (plane->state)
 610                                 old_fb = plane->state->fb;
 611                         else
 612                                 old_fb = plane->fb;
 613
 614                         if (!old_fb) {
 615                                 DRM_DEBUG_KMS("CRTC doesn't have current FB\n");
 616                                 ret = -EINVAL;
 617                                 goto out;
 618                         }
 619
 620                         fb = old_fb;
 621                         /* Make refcounting symmetric with the lookup path. */
 622                         drm_framebuffer_get(fb);
 623                 } else {
 624                         fb = drm_framebuffer_lookup(dev, file_priv, crtc_req->fb_id);
 625                         if (!fb) {
 626                                 DRM_DEBUG_KMS("Unknown FB ID%d\n",
 627                                                 crtc_req->fb_id);
 628                                 ret = -ENOENT;
 629                                 goto out;
 630                         }
 631                 }
 632
 633                 mode = drm_mode_create(dev);
 634                 if (!mode) {
 635                         ret = -ENOMEM;
 636                         goto out;
 637                 }
 638                 if (!file_priv->aspect_ratio_allowed &&
 639                     (crtc_req->mode.flags & DRM_MODE_FLAG_PIC_AR_MASK) != DRM_MODE_FLAG_PIC_AR_NONE) {
 640                         DRM_DEBUG_KMS("Unexpected aspect-ratio flag bits\n");
 641                         ret = -EINVAL;
 642                         goto out;
 643                 }
 644
 645
 646                 ret = drm_mode_convert_umode(dev, mode, &crtc_req->mode);
 647                 if (ret) {
 648                         DRM_DEBUG_KMS("Invalid mode (ret=%d, status=%s)\n",
 649                                       ret, drm_get_mode_status_name(mode->status));
 650                         drm_mode_debug_printmodeline(mode);
 651                         goto out;
 652                 }
 653
 654                 /*
 655                  * Check whether the primary plane supports the fb pixel format.
 656                  * Drivers not implementing the universal planes API use a
 657                  * default formats list provided by the DRM core which doesn't
 658                  * match real hardware capabilities. Skip the check in that
 659                  * case.
 660                  */
 661                 if (!plane->format_default) {
 662                         ret = drm_plane_check_pixel_format(plane,
 663                                                            fb->format->format,
 664                                                            fb->modifier);
 665                         if (ret) {
 666                                 struct drm_format_name_buf format_name;
 667
 668                                 DRM_DEBUG_KMS("Invalid pixel format %s, modifier 0x%llx\n",
 669                                               drm_get_format_name(fb->format->format,
 670                                                                   &format_name),
 671                                               fb->modifier);
 672                                 goto out;
 673                         }
 674                 }
 675
 676                 ret = drm_crtc_check_viewport(crtc, crtc_req->x, crtc_req->y,
 677                                               mode, fb);
 678                 if (ret)
 679                         goto out;
 680
 681         }
 682
 683         if (crtc_req->count_connectors == 0 && mode) {
 684                 DRM_DEBUG_KMS("Count connectors is 0 but mode set\n");
 685                 ret = -EINVAL;
 686                 goto out;
 687         }
 688
 689         if (crtc_req->count_connectors > 0 && (!mode || !fb)) {
 690                 DRM_DEBUG_KMS("Count connectors is %d but no mode or fb set\n",
 691                           crtc_req->count_connectors);
 692                 ret = -EINVAL;
 693                 goto out;
 694         }
 695
 696         if (crtc_req->count_connectors > 0) {
 697                 u32 out_id;
 698
 699                 /* Avoid unbounded kernel memory allocation */
 700                 if (crtc_req->count_connectors > config->num_connector) {
 701                         ret = -EINVAL;
 702                         goto out;
 703                 }
 704
 705                 connector_set = kmalloc_array(crtc_req->count_connectors,
 706                                               sizeof(struct drm_connector *),
 707                                               GFP_KERNEL);
 708                 if (!connector_set) {
 709                         ret = -ENOMEM;
 710                         goto out;
 711                 }
 712
 713                 for (i = 0; i < crtc_req->count_connectors; i++) {
 714                         connector_set[i] = NULL;
 715                         set_connectors_ptr = (uint32_t __user *)(unsigned long)crtc_req->set_connectors_ptr;
 716                         if (get_user(out_id, &set_connectors_ptr[i])) {
 717                                 ret = -EFAULT;
 718                                 goto out;
 719                         }
 720
 721                         connector = drm_connector_lookup(dev, file_priv, out_id);
 722                         if (!connector) {
 723                                 DRM_DEBUG_KMS("Connector id %d unknown\n",
 724                                                 out_id);
 725                                 ret = -ENOENT;
 726                                 goto out;
 727                         }
 728                         DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n",
 729                                         connector->base.id,
 730                                         connector->name);
 731
 732                         connector_set[i] = connector;
 733                 }
 734         }
 735
 736         set.crtc = crtc;
 737         set.x = crtc_req->x;
 738         set.y = crtc_req->y;
 739         set.mode = mode;
 740         set.connectors = connector_set;
 741         set.num_connectors = crtc_req->count_connectors;
 742         set.fb = fb;
 743
 744         if (drm_drv_uses_atomic_modeset(dev))
 745                 ret = crtc->funcs->set_config(&set, &ctx);
 746         else
 747                 ret = __drm_mode_set_config_internal(&set, &ctx);
 748
 749 out:
 750         if (fb)
 751                 drm_framebuffer_put(fb);
 752
 753         if (connector_set) {
 754                 for (i = 0; i < crtc_req->count_connectors; i++) {
 755                         if (connector_set[i])
 756                                 drm_connector_put(connector_set[i]);
 757                 }
 758         }
 759         kfree(connector_set);
 760         drm_mode_destroy(dev, mode);
 761
 762         /* In case we need to retry... */
 763         connector_set = NULL;
 764         fb = NULL;
 765         mode = NULL;
 766
 767         DRM_MODESET_LOCK_ALL_END(dev, ctx, ret);
 768
 769         return ret;
 770 }
 771
 772 int drm_mode_crtc_set_obj_prop(struct drm_mode_object *obj,
 773                                struct drm_property *property,
 774                                uint64_t value)
 775 {
 776         int ret = -EINVAL;
 777         struct drm_crtc *crtc = obj_to_crtc(obj);
 778
 779         if (crtc->funcs->set_property)
 780                 ret = crtc->funcs->set_property(crtc, property, value);
 781         if (!ret)
 782                 drm_object_property_set_value(obj, property, value);
 783
 784         return ret;
 785 }
 786
 787 /**
 788  * drm_crtc_create_scaling_filter_property - create a new scaling filter
 789  * property
 790  *
 791  * @crtc: drm CRTC
 792  * @supported_filters: bitmask of supported scaling filters, must include
 793  *                     BIT(DRM_SCALING_FILTER_DEFAULT).
 794  *
 795  * This function lets driver to enable the scaling filter property on a given
 796  * CRTC.
 797  *
 798  * RETURNS:
 799  * Zero for success or -errno
 800  */
 801 int drm_crtc_create_scaling_filter_property(struct drm_crtc *crtc,
 802                                             unsigned int supported_filters)
 803 {
 804         struct drm_property *prop =
 805                 drm_create_scaling_filter_prop(crtc->dev, supported_filters);
 806
 807         if (IS_ERR(prop))
 808                 return PTR_ERR(prop);
 809
 810         drm_object_attach_property(&crtc->base, prop,
 811                                    DRM_SCALING_FILTER_DEFAULT);
 812         crtc->scaling_filter_property = prop;
 813
 814         return 0;
 815 }
 816 EXPORT_SYMBOL(drm_crtc_create_scaling_filter_property);