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.
  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  * The @primary and @cursor planes are only relevant for legacy uAPI, see
 260  * &drm_crtc.primary and &drm_crtc.cursor.
 261  *
 262  * Returns:
 263  * Zero on success, error code on failure.
 264  */
 265 int drm_crtc_init_with_planes(struct drm_device *dev, struct drm_crtc *crtc,
 266                               struct drm_plane *primary,
 267                               struct drm_plane *cursor,
 268                               const struct drm_crtc_funcs *funcs,
 269                               const char *name, ...)
 270 {
 271         struct drm_mode_config *config = &dev->mode_config;
 272         int ret;
 273
 274         WARN_ON(primary && primary->type != DRM_PLANE_TYPE_PRIMARY);
 275         WARN_ON(cursor && cursor->type != DRM_PLANE_TYPE_CURSOR);
 276
 277         /* crtc index is used with 32bit bitmasks */
 278         if (WARN_ON(config->num_crtc >= 32))
 279                 return -EINVAL;
 280
 281         WARN_ON(drm_drv_uses_atomic_modeset(dev) &&
 282                 (!funcs->atomic_destroy_state ||
 283                  !funcs->atomic_duplicate_state));
 284
 285         crtc->dev = dev;
 286         crtc->funcs = funcs;
 287
 288         INIT_LIST_HEAD(&crtc->commit_list);
 289         spin_lock_init(&crtc->commit_lock);
 290
 291         drm_modeset_lock_init(&crtc->mutex);
 292         ret = drm_mode_object_add(dev, &crtc->base, DRM_MODE_OBJECT_CRTC);
 293         if (ret)
 294                 return ret;
 295
 296         if (name) {
 297                 va_list ap;
 298
 299                 va_start(ap, name);
 300                 crtc->name = kvasprintf(GFP_KERNEL, name, ap);
 301                 va_end(ap);
 302         } else {
 303                 crtc->name = kasprintf(GFP_KERNEL, "crtc-%d",
 304                                        drm_num_crtcs(dev));
 305         }
 306         if (!crtc->name) {
 307                 drm_mode_object_unregister(dev, &crtc->base);
 308                 return -ENOMEM;
 309         }
 310
 311         crtc->fence_context = dma_fence_context_alloc(1);
 312         spin_lock_init(&crtc->fence_lock);
 313         snprintf(crtc->timeline_name, sizeof(crtc->timeline_name),
 314                  "CRTC:%d-%s", crtc->base.id, crtc->name);
 315
 316         crtc->base.properties = &crtc->properties;
 317
 318         list_add_tail(&crtc->head, &config->crtc_list);
 319         crtc->index = config->num_crtc++;
 320
 321         crtc->primary = primary;
 322         crtc->cursor = cursor;
 323         if (primary && !primary->possible_crtcs)
 324                 primary->possible_crtcs = drm_crtc_mask(crtc);
 325         if (cursor && !cursor->possible_crtcs)
 326                 cursor->possible_crtcs = drm_crtc_mask(crtc);
 327
 328         ret = drm_crtc_crc_init(crtc);
 329         if (ret) {
 330                 drm_mode_object_unregister(dev, &crtc->base);
 331                 return ret;
 332         }
 333
 334         if (drm_core_check_feature(dev, DRIVER_ATOMIC)) {
 335                 drm_object_attach_property(&crtc->base, config->prop_active, 0);
 336                 drm_object_attach_property(&crtc->base, config->prop_mode_id, 0);
 337                 drm_object_attach_property(&crtc->base,
 338                                            config->prop_out_fence_ptr, 0);
 339                 drm_object_attach_property(&crtc->base,
 340                                            config->prop_vrr_enabled, 0);
 341         }
 342
 343         return 0;
 344 }
 345 EXPORT_SYMBOL(drm_crtc_init_with_planes);
 346
 347 /**
 348  * drm_crtc_cleanup - Clean up the core crtc usage
 349  * @crtc: CRTC to cleanup
 350  *
 351  * This function cleans up @crtc and removes it from the DRM mode setting
 352  * core. Note that the function does *not* free the crtc structure itself,
 353  * this is the responsibility of the caller.
 354  */
 355 void drm_crtc_cleanup(struct drm_crtc *crtc)
 356 {
 357         struct drm_device *dev = crtc->dev;
 358
 359         /* Note that the crtc_list is considered to be static; should we
 360          * remove the drm_crtc at runtime we would have to decrement all
 361          * the indices on the drm_crtc after us in the crtc_list.
 362          */
 363
 364         drm_crtc_crc_fini(crtc);
 365
 366         kfree(crtc->gamma_store);
 367         crtc->gamma_store = NULL;
 368
 369         drm_modeset_lock_fini(&crtc->mutex);
 370
 371         drm_mode_object_unregister(dev, &crtc->base);
 372         list_del(&crtc->head);
 373         dev->mode_config.num_crtc--;
 374
 375         WARN_ON(crtc->state && !crtc->funcs->atomic_destroy_state);
 376         if (crtc->state && crtc->funcs->atomic_destroy_state)
 377                 crtc->funcs->atomic_destroy_state(crtc, crtc->state);
 378
 379         kfree(crtc->name);
 380
 381         memset(crtc, 0, sizeof(*crtc));
 382 }
 383 EXPORT_SYMBOL(drm_crtc_cleanup);
 384
 385 /**
 386  * drm_mode_getcrtc - get CRTC configuration
 387  * @dev: drm device for the ioctl
 388  * @data: data pointer for the ioctl
 389  * @file_priv: drm file for the ioctl call
 390  *
 391  * Construct a CRTC configuration structure to return to the user.
 392  *
 393  * Called by the user via ioctl.
 394  *
 395  * Returns:
 396  * Zero on success, negative errno on failure.
 397  */
 398 int drm_mode_getcrtc(struct drm_device *dev,
 399                      void *data, struct drm_file *file_priv)
 400 {
 401         struct drm_mode_crtc *crtc_resp = data;
 402         struct drm_crtc *crtc;
 403         struct drm_plane *plane;
 404
 405         if (!drm_core_check_feature(dev, DRIVER_MODESET))
 406                 return -EOPNOTSUPP;
 407
 408         crtc = drm_crtc_find(dev, file_priv, crtc_resp->crtc_id);
 409         if (!crtc)
 410                 return -ENOENT;
 411
 412         plane = crtc->primary;
 413
 414         crtc_resp->gamma_size = crtc->gamma_size;
 415
 416         drm_modeset_lock(&plane->mutex, NULL);
 417         if (plane->state && plane->state->fb)
 418                 crtc_resp->fb_id = plane->state->fb->base.id;
 419         else if (!plane->state && plane->fb)
 420                 crtc_resp->fb_id = plane->fb->base.id;
 421         else
 422                 crtc_resp->fb_id = 0;
 423
 424         if (plane->state) {
 425                 crtc_resp->x = plane->state->src_x >> 16;
 426                 crtc_resp->y = plane->state->src_y >> 16;
 427         }
 428         drm_modeset_unlock(&plane->mutex);
 429
 430         drm_modeset_lock(&crtc->mutex, NULL);
 431         if (crtc->state) {
 432                 if (crtc->state->enable) {
 433                         drm_mode_convert_to_umode(&crtc_resp->mode, &crtc->state->mode);
 434                         crtc_resp->mode_valid = 1;
 435                 } else {
 436                         crtc_resp->mode_valid = 0;
 437                 }
 438         } else {
 439                 crtc_resp->x = crtc->x;
 440                 crtc_resp->y = crtc->y;
 441
 442                 if (crtc->enabled) {
 443                         drm_mode_convert_to_umode(&crtc_resp->mode, &crtc->mode);
 444                         crtc_resp->mode_valid = 1;
 445
 446                 } else {
 447                         crtc_resp->mode_valid = 0;
 448                 }
 449         }
 450         if (!file_priv->aspect_ratio_allowed)
 451                 crtc_resp->mode.flags &= ~DRM_MODE_FLAG_PIC_AR_MASK;
 452         drm_modeset_unlock(&crtc->mutex);
 453
 454         return 0;
 455 }
 456
 457 static int __drm_mode_set_config_internal(struct drm_mode_set *set,
 458                                           struct drm_modeset_acquire_ctx *ctx)
 459 {
 460         struct drm_crtc *crtc = set->crtc;
 461         struct drm_framebuffer *fb;
 462         struct drm_crtc *tmp;
 463         int ret;
 464
 465         WARN_ON(drm_drv_uses_atomic_modeset(crtc->dev));
 466
 467         /*
 468          * NOTE: ->set_config can also disable other crtcs (if we steal all
 469          * connectors from it), hence we need to refcount the fbs across all
 470          * crtcs. Atomic modeset will have saner semantics ...
 471          */
 472         drm_for_each_crtc(tmp, crtc->dev) {
 473                 struct drm_plane *plane = tmp->primary;
 474
 475                 plane->old_fb = plane->fb;
 476         }
 477
 478         fb = set->fb;
 479
 480         ret = crtc->funcs->set_config(set, ctx);
 481         if (ret == 0) {
 482                 struct drm_plane *plane = crtc->primary;
 483
 484                 plane->crtc = fb ? crtc : NULL;
 485                 plane->fb = fb;
 486         }
 487
 488         drm_for_each_crtc(tmp, crtc->dev) {
 489                 struct drm_plane *plane = tmp->primary;
 490
 491                 if (plane->fb)
 492                         drm_framebuffer_get(plane->fb);
 493                 if (plane->old_fb)
 494                         drm_framebuffer_put(plane->old_fb);
 495                 plane->old_fb = NULL;
 496         }
 497
 498         return ret;
 499 }
 500
 501 /**
 502  * drm_mode_set_config_internal - helper to call &drm_mode_config_funcs.set_config
 503  * @set: modeset config to set
 504  *
 505  * This is a little helper to wrap internal calls to the
 506  * &drm_mode_config_funcs.set_config driver interface. The only thing it adds is
 507  * correct refcounting dance.
 508  *
 509  * This should only be used by non-atomic legacy drivers.
 510  *
 511  * Returns:
 512  * Zero on success, negative errno on failure.
 513  */
 514 int drm_mode_set_config_internal(struct drm_mode_set *set)
 515 {
 516         WARN_ON(drm_drv_uses_atomic_modeset(set->crtc->dev));
 517
 518         return __drm_mode_set_config_internal(set, NULL);
 519 }
 520 EXPORT_SYMBOL(drm_mode_set_config_internal);
 521
 522 /**
 523  * drm_crtc_check_viewport - Checks that a framebuffer is big enough for the
 524  *     CRTC viewport
 525  * @crtc: CRTC that framebuffer will be displayed on
 526  * @x: x panning
 527  * @y: y panning
 528  * @mode: mode that framebuffer will be displayed under
 529  * @fb: framebuffer to check size of
 530  */
 531 int drm_crtc_check_viewport(const struct drm_crtc *crtc,
 532                             int x, int y,
 533                             const struct drm_display_mode *mode,
 534                             const struct drm_framebuffer *fb)
 535
 536 {
 537         int hdisplay, vdisplay;
 538
 539         drm_mode_get_hv_timing(mode, &hdisplay, &vdisplay);
 540
 541         if (crtc->state &&
 542             drm_rotation_90_or_270(crtc->primary->state->rotation))
 543                 swap(hdisplay, vdisplay);
 544
 545         return drm_framebuffer_check_src_coords(x << 16, y << 16,
 546                                                 hdisplay << 16, vdisplay << 16,
 547                                                 fb);
 548 }
 549 EXPORT_SYMBOL(drm_crtc_check_viewport);
 550
 551 /**
 552  * drm_mode_setcrtc - set CRTC configuration
 553  * @dev: drm device for the ioctl
 554  * @data: data pointer for the ioctl
 555  * @file_priv: drm file for the ioctl call
 556  *
 557  * Build a new CRTC configuration based on user request.
 558  *
 559  * Called by the user via ioctl.
 560  *
 561  * Returns:
 562  * Zero on success, negative errno on failure.
 563  */
 564 int drm_mode_setcrtc(struct drm_device *dev, void *data,
 565                      struct drm_file *file_priv)
 566 {
 567         struct drm_mode_config *config = &dev->mode_config;
 568         struct drm_mode_crtc *crtc_req = data;
 569         struct drm_crtc *crtc;
 570         struct drm_plane *plane;
 571         struct drm_connector **connector_set = NULL, *connector;
 572         struct drm_framebuffer *fb = NULL;
 573         struct drm_display_mode *mode = NULL;
 574         struct drm_mode_set set;
 575         uint32_t __user *set_connectors_ptr;
 576         struct drm_modeset_acquire_ctx ctx;
 577         int ret;
 578         int i;
 579
 580         if (!drm_core_check_feature(dev, DRIVER_MODESET))
 581                 return -EOPNOTSUPP;
 582
 583         /*
 584          * Universal plane src offsets are only 16.16, prevent havoc for
 585          * drivers using universal plane code internally.
 586          */
 587         if (crtc_req->x & 0xffff0000 || crtc_req->y & 0xffff0000)
 588                 return -ERANGE;
 589
 590         crtc = drm_crtc_find(dev, file_priv, crtc_req->crtc_id);
 591         if (!crtc) {
 592                 DRM_DEBUG_KMS("Unknown CRTC ID %d\n", crtc_req->crtc_id);
 593                 return -ENOENT;
 594         }
 595         DRM_DEBUG_KMS("[CRTC:%d:%s]\n", crtc->base.id, crtc->name);
 596
 597         plane = crtc->primary;
 598
 599         /* allow disabling with the primary plane leased */
 600         if (crtc_req->mode_valid && !drm_lease_held(file_priv, plane->base.id))
 601                 return -EACCES;
 602
 603         DRM_MODESET_LOCK_ALL_BEGIN(dev, ctx,
 604                                    DRM_MODESET_ACQUIRE_INTERRUPTIBLE, ret);
 605
 606         if (crtc_req->mode_valid) {
 607                 /* If we have a mode we need a framebuffer. */
 608                 /* If we pass -1, set the mode with the currently bound fb */
 609                 if (crtc_req->fb_id == -1) {
 610                         struct drm_framebuffer *old_fb;
 611
 612                         if (plane->state)
 613                                 old_fb = plane->state->fb;
 614                         else
 615                                 old_fb = plane->fb;
 616
 617                         if (!old_fb) {
 618                                 DRM_DEBUG_KMS("CRTC doesn't have current FB\n");
 619                                 ret = -EINVAL;
 620                                 goto out;
 621                         }
 622
 623                         fb = old_fb;
 624                         /* Make refcounting symmetric with the lookup path. */
 625                         drm_framebuffer_get(fb);
 626                 } else {
 627                         fb = drm_framebuffer_lookup(dev, file_priv, crtc_req->fb_id);
 628                         if (!fb) {
 629                                 DRM_DEBUG_KMS("Unknown FB ID%d\n",
 630                                                 crtc_req->fb_id);
 631                                 ret = -ENOENT;
 632                                 goto out;
 633                         }
 634                 }
 635
 636                 mode = drm_mode_create(dev);
 637                 if (!mode) {
 638                         ret = -ENOMEM;
 639                         goto out;
 640                 }
 641                 if (!file_priv->aspect_ratio_allowed &&
 642                     (crtc_req->mode.flags & DRM_MODE_FLAG_PIC_AR_MASK) != DRM_MODE_FLAG_PIC_AR_NONE) {
 643                         DRM_DEBUG_KMS("Unexpected aspect-ratio flag bits\n");
 644                         ret = -EINVAL;
 645                         goto out;
 646                 }
 647
 648
 649                 ret = drm_mode_convert_umode(dev, mode, &crtc_req->mode);
 650                 if (ret) {
 651                         DRM_DEBUG_KMS("Invalid mode (ret=%d, status=%s)\n",
 652                                       ret, drm_get_mode_status_name(mode->status));
 653                         drm_mode_debug_printmodeline(mode);
 654                         goto out;
 655                 }
 656
 657                 /*
 658                  * Check whether the primary plane supports the fb pixel format.
 659                  * Drivers not implementing the universal planes API use a
 660                  * default formats list provided by the DRM core which doesn't
 661                  * match real hardware capabilities. Skip the check in that
 662                  * case.
 663                  */
 664                 if (!plane->format_default) {
 665                         ret = drm_plane_check_pixel_format(plane,
 666                                                            fb->format->format,
 667                                                            fb->modifier);
 668                         if (ret) {
 669                                 struct drm_format_name_buf format_name;
 670
 671                                 DRM_DEBUG_KMS("Invalid pixel format %s, modifier 0x%llx\n",
 672                                               drm_get_format_name(fb->format->format,
 673                                                                   &format_name),
 674                                               fb->modifier);
 675                                 goto out;
 676                         }
 677                 }
 678
 679                 ret = drm_crtc_check_viewport(crtc, crtc_req->x, crtc_req->y,
 680                                               mode, fb);
 681                 if (ret)
 682                         goto out;
 683
 684         }
 685
 686         if (crtc_req->count_connectors == 0 && mode) {
 687                 DRM_DEBUG_KMS("Count connectors is 0 but mode set\n");
 688                 ret = -EINVAL;
 689                 goto out;
 690         }
 691
 692         if (crtc_req->count_connectors > 0 && (!mode || !fb)) {
 693                 DRM_DEBUG_KMS("Count connectors is %d but no mode or fb set\n",
 694                           crtc_req->count_connectors);
 695                 ret = -EINVAL;
 696                 goto out;
 697         }
 698
 699         if (crtc_req->count_connectors > 0) {
 700                 u32 out_id;
 701
 702                 /* Avoid unbounded kernel memory allocation */
 703                 if (crtc_req->count_connectors > config->num_connector) {
 704                         ret = -EINVAL;
 705                         goto out;
 706                 }
 707
 708                 connector_set = kmalloc_array(crtc_req->count_connectors,
 709                                               sizeof(struct drm_connector *),
 710                                               GFP_KERNEL);
 711                 if (!connector_set) {
 712                         ret = -ENOMEM;
 713                         goto out;
 714                 }
 715
 716                 for (i = 0; i < crtc_req->count_connectors; i++) {
 717                         connector_set[i] = NULL;
 718                         set_connectors_ptr = (uint32_t __user *)(unsigned long)crtc_req->set_connectors_ptr;
 719                         if (get_user(out_id, &set_connectors_ptr[i])) {
 720                                 ret = -EFAULT;
 721                                 goto out;
 722                         }
 723
 724                         connector = drm_connector_lookup(dev, file_priv, out_id);
 725                         if (!connector) {
 726                                 DRM_DEBUG_KMS("Connector id %d unknown\n",
 727                                                 out_id);
 728                                 ret = -ENOENT;
 729                                 goto out;
 730                         }
 731                         DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n",
 732                                         connector->base.id,
 733                                         connector->name);
 734
 735                         connector_set[i] = connector;
 736                 }
 737         }
 738
 739         set.crtc = crtc;
 740         set.x = crtc_req->x;
 741         set.y = crtc_req->y;
 742         set.mode = mode;
 743         set.connectors = connector_set;
 744         set.num_connectors = crtc_req->count_connectors;
 745         set.fb = fb;
 746
 747         if (drm_drv_uses_atomic_modeset(dev))
 748                 ret = crtc->funcs->set_config(&set, &ctx);
 749         else
 750                 ret = __drm_mode_set_config_internal(&set, &ctx);
 751
 752 out:
 753         if (fb)
 754                 drm_framebuffer_put(fb);
 755
 756         if (connector_set) {
 757                 for (i = 0; i < crtc_req->count_connectors; i++) {
 758                         if (connector_set[i])
 759                                 drm_connector_put(connector_set[i]);
 760                 }
 761         }
 762         kfree(connector_set);
 763         drm_mode_destroy(dev, mode);
 764
 765         /* In case we need to retry... */
 766         connector_set = NULL;
 767         fb = NULL;
 768         mode = NULL;
 769
 770         DRM_MODESET_LOCK_ALL_END(dev, ctx, ret);
 771
 772         return ret;
 773 }
 774
 775 int drm_mode_crtc_set_obj_prop(struct drm_mode_object *obj,
 776                                struct drm_property *property,
 777                                uint64_t value)
 778 {
 779         int ret = -EINVAL;
 780         struct drm_crtc *crtc = obj_to_crtc(obj);
 781
 782         if (crtc->funcs->set_property)
 783                 ret = crtc->funcs->set_property(crtc, property, value);
 784         if (!ret)
 785                 drm_object_property_set_value(obj, property, value);
 786
 787         return ret;
 788 }
 789
 790 /**
 791  * drm_crtc_create_scaling_filter_property - create a new scaling filter
 792  * property
 793  *
 794  * @crtc: drm CRTC
 795  * @supported_filters: bitmask of supported scaling filters, must include
 796  *                     BIT(DRM_SCALING_FILTER_DEFAULT).
 797  *
 798  * This function lets driver to enable the scaling filter property on a given
 799  * CRTC.
 800  *
 801  * RETURNS:
 802  * Zero for success or -errno
 803  */
 804 int drm_crtc_create_scaling_filter_property(struct drm_crtc *crtc,
 805                                             unsigned int supported_filters)
 806 {
 807         struct drm_property *prop =
 808                 drm_create_scaling_filter_prop(crtc->dev, supported_filters);
 809
 810         if (IS_ERR(prop))
 811                 return PTR_ERR(prop);
 812
 813         drm_object_attach_property(&crtc->base, prop,
 814                                    DRM_SCALING_FILTER_DEFAULT);
 815         crtc->scaling_filter_property = prop;
 816
 817         return 0;
 818 }
 819 EXPORT_SYMBOL(drm_crtc_create_scaling_filter_property);