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_managed.h>
  42 #include <drm/drm_modeset_lock.h>
  43 #include <drm/drm_atomic.h>
  44 #include <drm/drm_auth.h>
  45 #include <drm/drm_debugfs_crc.h>
  46 #include <drm/drm_drv.h>
  47 #include <drm/drm_print.h>
  48 #include <drm/drm_file.h>
  49
  50 #include "drm_crtc_internal.h"
  51 #include "drm_internal.h"
  52
  53 /**
  54  * DOC: overview
  55  *
  56  * A CRTC represents the overall display pipeline. It receives pixel data from
  57  * &drm_plane and blends them together. The &drm_display_mode is also attached
  58  * to the CRTC, specifying display timings. On the output side the data is fed
  59  * to one or more &drm_encoder, which are then each connected to one
  60  * &drm_connector.
  61  *
  62  * To create a CRTC, a KMS drivers allocates and zeroes an instances of
  63  * &struct drm_crtc (possibly as part of a larger structure) and registers it
  64  * with a call to drm_crtc_init_with_planes().
  65  *
  66  * The CRTC is also the entry point for legacy modeset operations, see
  67  * &drm_crtc_funcs.set_config, legacy plane operations, see
  68  * &drm_crtc_funcs.page_flip and &drm_crtc_funcs.cursor_set2, and other legacy
  69  * operations like &drm_crtc_funcs.gamma_set. For atomic drivers all these
  70  * features are controlled through &drm_property and
  71  * &drm_mode_config_funcs.atomic_check.
  72  */
  73
  74 /**
  75  * drm_crtc_from_index - find the registered CRTC at an index
  76  * @dev: DRM device
  77  * @idx: index of registered CRTC to find for
  78  *
  79  * Given a CRTC index, return the registered CRTC from DRM device's
  80  * list of CRTCs with matching index. This is the inverse of drm_crtc_index().
  81  * It's useful in the vblank callbacks (like &drm_driver.enable_vblank or
  82  * &drm_driver.disable_vblank), since that still deals with indices instead
  83  * of pointers to &struct drm_crtc."
  84  */
  85 struct drm_crtc *drm_crtc_from_index(struct drm_device *dev, int idx)
  86 {
  87         struct drm_crtc *crtc;
  88
  89         drm_for_each_crtc(crtc, dev)
  90                 if (idx == crtc->index)
  91                         return crtc;
  92
  93         return NULL;
  94 }
  95 EXPORT_SYMBOL(drm_crtc_from_index);
  96
  97 int drm_crtc_force_disable(struct drm_crtc *crtc)
  98 {
  99         struct drm_mode_set set = {
 100                 .crtc = crtc,
 101         };
 102
 103         WARN_ON(drm_drv_uses_atomic_modeset(crtc->dev));
 104
 105         return drm_mode_set_config_internal(&set);
 106 }
 107
 108 static unsigned int drm_num_crtcs(struct drm_device *dev)
 109 {
 110         unsigned int num = 0;
 111         struct drm_crtc *tmp;
 112
 113         drm_for_each_crtc(tmp, dev) {
 114                 num++;
 115         }
 116
 117         return num;
 118 }
 119
 120 int drm_crtc_register_all(struct drm_device *dev)
 121 {
 122         struct drm_crtc *crtc;
 123         int ret = 0;
 124
 125         drm_for_each_crtc(crtc, dev) {
 126                 drm_debugfs_crtc_add(crtc);
 127
 128                 if (crtc->funcs->late_register)
 129                         ret = crtc->funcs->late_register(crtc);
 130                 if (ret)
 131                         return ret;
 132         }
 133
 134         return 0;
 135 }
 136
 137 void drm_crtc_unregister_all(struct drm_device *dev)
 138 {
 139         struct drm_crtc *crtc;
 140
 141         drm_for_each_crtc(crtc, dev) {
 142                 if (crtc->funcs->early_unregister)
 143                         crtc->funcs->early_unregister(crtc);
 144                 drm_debugfs_crtc_remove(crtc);
 145         }
 146 }
 147
 148 static int drm_crtc_crc_init(struct drm_crtc *crtc)
 149 {
 150 #ifdef CONFIG_DEBUG_FS
 151         spin_lock_init(&crtc->crc.lock);
 152         init_waitqueue_head(&crtc->crc.wq);
 153         crtc->crc.source = kstrdup("auto", GFP_KERNEL);
 154         if (!crtc->crc.source)
 155                 return -ENOMEM;
 156 #endif
 157         return 0;
 158 }
 159
 160 static void drm_crtc_crc_fini(struct drm_crtc *crtc)
 161 {
 162 #ifdef CONFIG_DEBUG_FS
 163         kfree(crtc->crc.source);
 164 #endif
 165 }
 166
 167 static const struct dma_fence_ops drm_crtc_fence_ops;
 168
 169 static struct drm_crtc *fence_to_crtc(struct dma_fence *fence)
 170 {
 171         BUG_ON(fence->ops != &drm_crtc_fence_ops);
 172         return container_of(fence->lock, struct drm_crtc, fence_lock);
 173 }
 174
 175 static const char *drm_crtc_fence_get_driver_name(struct dma_fence *fence)
 176 {
 177         struct drm_crtc *crtc = fence_to_crtc(fence);
 178
 179         return crtc->dev->driver->name;
 180 }
 181
 182 static const char *drm_crtc_fence_get_timeline_name(struct dma_fence *fence)
 183 {
 184         struct drm_crtc *crtc = fence_to_crtc(fence);
 185
 186         return crtc->timeline_name;
 187 }
 188
 189 static const struct dma_fence_ops drm_crtc_fence_ops = {
 190         .get_driver_name = drm_crtc_fence_get_driver_name,
 191         .get_timeline_name = drm_crtc_fence_get_timeline_name,
 192 };
 193
 194 struct dma_fence *drm_crtc_create_fence(struct drm_crtc *crtc)
 195 {
 196         struct dma_fence *fence;
 197
 198         fence = kzalloc(sizeof(*fence), GFP_KERNEL);
 199         if (!fence)
 200                 return NULL;
 201
 202         dma_fence_init(fence, &drm_crtc_fence_ops, &crtc->fence_lock,
 203                        crtc->fence_context, ++crtc->fence_seqno);
 204
 205         return fence;
 206 }
 207
 208 /**
 209  * DOC: standard CRTC properties
 210  *
 211  * DRM CRTCs have a few standardized properties:
 212  *
 213  * ACTIVE:
 214  *      Atomic property for setting the power state of the CRTC. When set to 1
 215  *      the CRTC will actively display content. When set to 0 the CRTC will be
 216  *      powered off. There is no expectation that user-space will reset CRTC
 217  *      resources like the mode and planes when setting ACTIVE to 0.
 218  *
 219  *      User-space can rely on an ACTIVE change to 1 to never fail an atomic
 220  *      test as long as no other property has changed. If a change to ACTIVE
 221  *      fails an atomic test, this is a driver bug. For this reason setting
 222  *      ACTIVE to 0 must not release internal resources (like reserved memory
 223  *      bandwidth or clock generators).
 224  *
 225  *      Note that the legacy DPMS property on connectors is internally routed
 226  *      to control this property for atomic drivers.
 227  * MODE_ID:
 228  *      Atomic property for setting the CRTC display timings. The value is the
 229  *      ID of a blob containing the DRM mode info. To disable the CRTC,
 230  *      user-space must set this property to 0.
 231  *
 232  *      Setting MODE_ID to 0 will release reserved resources for the CRTC.
 233  * SCALING_FILTER:
 234  *      Atomic property for setting the scaling filter for CRTC scaler
 235  *
 236  *      The value of this property can be one of the following:
 237  *
 238  *      Default:
 239  *              Driver's default scaling filter
 240  *      Nearest Neighbor:
 241  *              Nearest Neighbor scaling filter
 242  */
 243
 244 __printf(6, 0)
 245 static int __drm_crtc_init_with_planes(struct drm_device *dev, struct drm_crtc *crtc,
 246                                        struct drm_plane *primary,
 247                                        struct drm_plane *cursor,
 248                                        const struct drm_crtc_funcs *funcs,
 249                                        const char *name, va_list ap)
 250 {
 251         struct drm_mode_config *config = &dev->mode_config;
 252         int ret;
 253
 254         WARN_ON(primary && primary->type != DRM_PLANE_TYPE_PRIMARY);
 255         WARN_ON(cursor && cursor->type != DRM_PLANE_TYPE_CURSOR);
 256
 257         /* crtc index is used with 32bit bitmasks */
 258         if (WARN_ON(config->num_crtc >= 32))
 259                 return -EINVAL;
 260
 261         WARN_ON(drm_drv_uses_atomic_modeset(dev) &&
 262                 (!funcs->atomic_destroy_state ||
 263                  !funcs->atomic_duplicate_state));
 264
 265         crtc->dev = dev;
 266         crtc->funcs = funcs;
 267
 268         INIT_LIST_HEAD(&crtc->commit_list);
 269         spin_lock_init(&crtc->commit_lock);
 270
 271         drm_modeset_lock_init(&crtc->mutex);
 272         ret = drm_mode_object_add(dev, &crtc->base, DRM_MODE_OBJECT_CRTC);
 273         if (ret)
 274                 return ret;
 275
 276         if (name) {
 277                 crtc->name = kvasprintf(GFP_KERNEL, name, ap);
 278         } else {
 279                 crtc->name = kasprintf(GFP_KERNEL, "crtc-%d",
 280                                        drm_num_crtcs(dev));
 281         }
 282         if (!crtc->name) {
 283                 drm_mode_object_unregister(dev, &crtc->base);
 284                 return -ENOMEM;
 285         }
 286
 287         crtc->fence_context = dma_fence_context_alloc(1);
 288         spin_lock_init(&crtc->fence_lock);
 289         snprintf(crtc->timeline_name, sizeof(crtc->timeline_name),
 290                  "CRTC:%d-%s", crtc->base.id, crtc->name);
 291
 292         crtc->base.properties = &crtc->properties;
 293
 294         list_add_tail(&crtc->head, &config->crtc_list);
 295         crtc->index = config->num_crtc++;
 296
 297         crtc->primary = primary;
 298         crtc->cursor = cursor;
 299         if (primary && !primary->possible_crtcs)
 300                 primary->possible_crtcs = drm_crtc_mask(crtc);
 301         if (cursor && !cursor->possible_crtcs)
 302                 cursor->possible_crtcs = drm_crtc_mask(crtc);
 303
 304         ret = drm_crtc_crc_init(crtc);
 305         if (ret) {
 306                 drm_mode_object_unregister(dev, &crtc->base);
 307                 return ret;
 308         }
 309
 310         if (drm_core_check_feature(dev, DRIVER_ATOMIC)) {
 311                 drm_object_attach_property(&crtc->base, config->prop_active, 0);
 312                 drm_object_attach_property(&crtc->base, config->prop_mode_id, 0);
 313                 drm_object_attach_property(&crtc->base,
 314                                            config->prop_out_fence_ptr, 0);
 315                 drm_object_attach_property(&crtc->base,
 316                                            config->prop_vrr_enabled, 0);
 317         }
 318
 319         return 0;
 320 }
 321
 322 /**
 323  * drm_crtc_init_with_planes - Initialise a new CRTC object with
 324  *    specified primary and cursor planes.
 325  * @dev: DRM device
 326  * @crtc: CRTC object to init
 327  * @primary: Primary plane for CRTC
 328  * @cursor: Cursor plane for CRTC
 329  * @funcs: callbacks for the new CRTC
 330  * @name: printf style format string for the CRTC name, or NULL for default name
 331  *
 332  * Inits a new object created as base part of a driver crtc object. Drivers
 333  * should use this function instead of drm_crtc_init(), which is only provided
 334  * for backwards compatibility with drivers which do not yet support universal
 335  * planes). For really simple hardware which has only 1 plane look at
 336  * drm_simple_display_pipe_init() instead.
 337  * The &drm_crtc_funcs.destroy hook should call drm_crtc_cleanup() and kfree()
 338  * the crtc structure. The crtc structure should not be allocated with
 339  * devm_kzalloc().
 340  *
 341  * The @primary and @cursor planes are only relevant for legacy uAPI, see
 342  * &drm_crtc.primary and &drm_crtc.cursor.
 343  *
 344  * Note: consider using drmm_crtc_alloc_with_planes() or
 345  * drmm_crtc_init_with_planes() instead of drm_crtc_init_with_planes()
 346  * to let the DRM managed resource infrastructure take care of cleanup
 347  * and deallocation.
 348  *
 349  * Returns:
 350  * Zero on success, error code on failure.
 351  */
 352 int drm_crtc_init_with_planes(struct drm_device *dev, struct drm_crtc *crtc,
 353                               struct drm_plane *primary,
 354                               struct drm_plane *cursor,
 355                               const struct drm_crtc_funcs *funcs,
 356                               const char *name, ...)
 357 {
 358         va_list ap;
 359         int ret;
 360
 361         WARN_ON(!funcs->destroy);
 362
 363         va_start(ap, name);
 364         ret = __drm_crtc_init_with_planes(dev, crtc, primary, cursor, funcs,
 365                                           name, ap);
 366         va_end(ap);
 367
 368         return ret;
 369 }
 370 EXPORT_SYMBOL(drm_crtc_init_with_planes);
 371
 372 static void drmm_crtc_init_with_planes_cleanup(struct drm_device *dev,
 373                                                void *ptr)
 374 {
 375         struct drm_crtc *crtc = ptr;
 376
 377         drm_crtc_cleanup(crtc);
 378 }
 379
 380 static int __drmm_crtc_init_with_planes(struct drm_device *dev,
 381                                         struct drm_crtc *crtc,
 382                                         struct drm_plane *primary,
 383                                         struct drm_plane *cursor,
 384                                         const struct drm_crtc_funcs *funcs,
 385                                         const char *name,
 386                                         va_list args)
 387 {
 388         int ret;
 389
 390         drm_WARN_ON(dev, funcs && funcs->destroy);
 391
 392         ret = __drm_crtc_init_with_planes(dev, crtc, primary, cursor, funcs,
 393                                           name, args);
 394         if (ret)
 395                 return ret;
 396
 397         ret = drmm_add_action_or_reset(dev, drmm_crtc_init_with_planes_cleanup,
 398                                        crtc);
 399         if (ret)
 400                 return ret;
 401
 402         return 0;
 403 }
 404
 405 /**
 406  * drmm_crtc_init_with_planes - Initialise a new CRTC object with
 407  *    specified primary and cursor planes.
 408  * @dev: DRM device
 409  * @crtc: CRTC object to init
 410  * @primary: Primary plane for CRTC
 411  * @cursor: Cursor plane for CRTC
 412  * @funcs: callbacks for the new CRTC
 413  * @name: printf style format string for the CRTC name, or NULL for default name
 414  *
 415  * Inits a new object created as base part of a driver crtc object. Drivers
 416  * should use this function instead of drm_crtc_init(), which is only provided
 417  * for backwards compatibility with drivers which do not yet support universal
 418  * planes). For really simple hardware which has only 1 plane look at
 419  * drm_simple_display_pipe_init() instead.
 420  *
 421  * Cleanup is automatically handled through registering
 422  * drmm_crtc_cleanup() with drmm_add_action(). The crtc structure should
 423  * be allocated with drmm_kzalloc().
 424  *
 425  * The @drm_crtc_funcs.destroy hook must be NULL.
 426  *
 427  * The @primary and @cursor planes are only relevant for legacy uAPI, see
 428  * &drm_crtc.primary and &drm_crtc.cursor.
 429  *
 430  * Returns:
 431  * Zero on success, error code on failure.
 432  */
 433 int drmm_crtc_init_with_planes(struct drm_device *dev, struct drm_crtc *crtc,
 434                                struct drm_plane *primary,
 435                                struct drm_plane *cursor,
 436                                const struct drm_crtc_funcs *funcs,
 437                                const char *name, ...)
 438 {
 439         va_list ap;
 440         int ret;
 441
 442         va_start(ap, name);
 443         ret = __drmm_crtc_init_with_planes(dev, crtc, primary, cursor, funcs,
 444                                            name, ap);
 445         va_end(ap);
 446         if (ret)
 447                 return ret;
 448
 449         return 0;
 450 }
 451 EXPORT_SYMBOL(drmm_crtc_init_with_planes);
 452
 453 void *__drmm_crtc_alloc_with_planes(struct drm_device *dev,
 454                                     size_t size, size_t offset,
 455                                     struct drm_plane *primary,
 456                                     struct drm_plane *cursor,
 457                                     const struct drm_crtc_funcs *funcs,
 458                                     const char *name, ...)
 459 {
 460         void *container;
 461         struct drm_crtc *crtc;
 462         va_list ap;
 463         int ret;
 464
 465         if (WARN_ON(!funcs || funcs->destroy))
 466                 return ERR_PTR(-EINVAL);
 467
 468         container = drmm_kzalloc(dev, size, GFP_KERNEL);
 469         if (!container)
 470                 return ERR_PTR(-ENOMEM);
 471
 472         crtc = container + offset;
 473
 474         va_start(ap, name);
 475         ret = __drmm_crtc_init_with_planes(dev, crtc, primary, cursor, funcs,
 476                                            name, ap);
 477         va_end(ap);
 478         if (ret)
 479                 return ERR_PTR(ret);
 480
 481         return container;
 482 }
 483 EXPORT_SYMBOL(__drmm_crtc_alloc_with_planes);
 484
 485 /**
 486  * drm_crtc_cleanup - Clean up the core crtc usage
 487  * @crtc: CRTC to cleanup
 488  *
 489  * This function cleans up @crtc and removes it from the DRM mode setting
 490  * core. Note that the function does *not* free the crtc structure itself,
 491  * this is the responsibility of the caller.
 492  */
 493 void drm_crtc_cleanup(struct drm_crtc *crtc)
 494 {
 495         struct drm_device *dev = crtc->dev;
 496
 497         /* Note that the crtc_list is considered to be static; should we
 498          * remove the drm_crtc at runtime we would have to decrement all
 499          * the indices on the drm_crtc after us in the crtc_list.
 500          */
 501
 502         drm_crtc_crc_fini(crtc);
 503
 504         kfree(crtc->gamma_store);
 505         crtc->gamma_store = NULL;
 506
 507         drm_modeset_lock_fini(&crtc->mutex);
 508
 509         drm_mode_object_unregister(dev, &crtc->base);
 510         list_del(&crtc->head);
 511         dev->mode_config.num_crtc--;
 512
 513         WARN_ON(crtc->state && !crtc->funcs->atomic_destroy_state);
 514         if (crtc->state && crtc->funcs->atomic_destroy_state)
 515                 crtc->funcs->atomic_destroy_state(crtc, crtc->state);
 516
 517         kfree(crtc->name);
 518
 519         memset(crtc, 0, sizeof(*crtc));
 520 }
 521 EXPORT_SYMBOL(drm_crtc_cleanup);
 522
 523 /**
 524  * drm_mode_getcrtc - get CRTC configuration
 525  * @dev: drm device for the ioctl
 526  * @data: data pointer for the ioctl
 527  * @file_priv: drm file for the ioctl call
 528  *
 529  * Construct a CRTC configuration structure to return to the user.
 530  *
 531  * Called by the user via ioctl.
 532  *
 533  * Returns:
 534  * Zero on success, negative errno on failure.
 535  */
 536 int drm_mode_getcrtc(struct drm_device *dev,
 537                      void *data, struct drm_file *file_priv)
 538 {
 539         struct drm_mode_crtc *crtc_resp = data;
 540         struct drm_crtc *crtc;
 541         struct drm_plane *plane;
 542
 543         if (!drm_core_check_feature(dev, DRIVER_MODESET))
 544                 return -EOPNOTSUPP;
 545
 546         crtc = drm_crtc_find(dev, file_priv, crtc_resp->crtc_id);
 547         if (!crtc)
 548                 return -ENOENT;
 549
 550         plane = crtc->primary;
 551
 552         crtc_resp->gamma_size = crtc->gamma_size;
 553
 554         drm_modeset_lock(&plane->mutex, NULL);
 555         if (plane->state && plane->state->fb)
 556                 crtc_resp->fb_id = plane->state->fb->base.id;
 557         else if (!plane->state && plane->fb)
 558                 crtc_resp->fb_id = plane->fb->base.id;
 559         else
 560                 crtc_resp->fb_id = 0;
 561
 562         if (plane->state) {
 563                 crtc_resp->x = plane->state->src_x >> 16;
 564                 crtc_resp->y = plane->state->src_y >> 16;
 565         }
 566         drm_modeset_unlock(&plane->mutex);
 567
 568         drm_modeset_lock(&crtc->mutex, NULL);
 569         if (crtc->state) {
 570                 if (crtc->state->enable) {
 571                         drm_mode_convert_to_umode(&crtc_resp->mode, &crtc->state->mode);
 572                         crtc_resp->mode_valid = 1;
 573                 } else {
 574                         crtc_resp->mode_valid = 0;
 575                 }
 576         } else {
 577                 crtc_resp->x = crtc->x;
 578                 crtc_resp->y = crtc->y;
 579
 580                 if (crtc->enabled) {
 581                         drm_mode_convert_to_umode(&crtc_resp->mode, &crtc->mode);
 582                         crtc_resp->mode_valid = 1;
 583
 584                 } else {
 585                         crtc_resp->mode_valid = 0;
 586                 }
 587         }
 588         if (!file_priv->aspect_ratio_allowed)
 589                 crtc_resp->mode.flags &= ~DRM_MODE_FLAG_PIC_AR_MASK;
 590         drm_modeset_unlock(&crtc->mutex);
 591
 592         return 0;
 593 }
 594
 595 static int __drm_mode_set_config_internal(struct drm_mode_set *set,
 596                                           struct drm_modeset_acquire_ctx *ctx)
 597 {
 598         struct drm_crtc *crtc = set->crtc;
 599         struct drm_framebuffer *fb;
 600         struct drm_crtc *tmp;
 601         int ret;
 602
 603         WARN_ON(drm_drv_uses_atomic_modeset(crtc->dev));
 604
 605         /*
 606          * NOTE: ->set_config can also disable other crtcs (if we steal all
 607          * connectors from it), hence we need to refcount the fbs across all
 608          * crtcs. Atomic modeset will have saner semantics ...
 609          */
 610         drm_for_each_crtc(tmp, crtc->dev) {
 611                 struct drm_plane *plane = tmp->primary;
 612
 613                 plane->old_fb = plane->fb;
 614         }
 615
 616         fb = set->fb;
 617
 618         ret = crtc->funcs->set_config(set, ctx);
 619         if (ret == 0) {
 620                 struct drm_plane *plane = crtc->primary;
 621
 622                 plane->crtc = fb ? crtc : NULL;
 623                 plane->fb = fb;
 624         }
 625
 626         drm_for_each_crtc(tmp, crtc->dev) {
 627                 struct drm_plane *plane = tmp->primary;
 628
 629                 if (plane->fb)
 630                         drm_framebuffer_get(plane->fb);
 631                 if (plane->old_fb)
 632                         drm_framebuffer_put(plane->old_fb);
 633                 plane->old_fb = NULL;
 634         }
 635
 636         return ret;
 637 }
 638
 639 /**
 640  * drm_mode_set_config_internal - helper to call &drm_mode_config_funcs.set_config
 641  * @set: modeset config to set
 642  *
 643  * This is a little helper to wrap internal calls to the
 644  * &drm_mode_config_funcs.set_config driver interface. The only thing it adds is
 645  * correct refcounting dance.
 646  *
 647  * This should only be used by non-atomic legacy drivers.
 648  *
 649  * Returns:
 650  * Zero on success, negative errno on failure.
 651  */
 652 int drm_mode_set_config_internal(struct drm_mode_set *set)
 653 {
 654         WARN_ON(drm_drv_uses_atomic_modeset(set->crtc->dev));
 655
 656         return __drm_mode_set_config_internal(set, NULL);
 657 }
 658 EXPORT_SYMBOL(drm_mode_set_config_internal);
 659
 660 /**
 661  * drm_crtc_check_viewport - Checks that a framebuffer is big enough for the
 662  *     CRTC viewport
 663  * @crtc: CRTC that framebuffer will be displayed on
 664  * @x: x panning
 665  * @y: y panning
 666  * @mode: mode that framebuffer will be displayed under
 667  * @fb: framebuffer to check size of
 668  */
 669 int drm_crtc_check_viewport(const struct drm_crtc *crtc,
 670                             int x, int y,
 671                             const struct drm_display_mode *mode,
 672                             const struct drm_framebuffer *fb)
 673
 674 {
 675         int hdisplay, vdisplay;
 676
 677         drm_mode_get_hv_timing(mode, &hdisplay, &vdisplay);
 678
 679         if (crtc->state &&
 680             drm_rotation_90_or_270(crtc->primary->state->rotation))
 681                 swap(hdisplay, vdisplay);
 682
 683         return drm_framebuffer_check_src_coords(x << 16, y << 16,
 684                                                 hdisplay << 16, vdisplay << 16,
 685                                                 fb);
 686 }
 687 EXPORT_SYMBOL(drm_crtc_check_viewport);
 688
 689 /**
 690  * drm_mode_setcrtc - set CRTC configuration
 691  * @dev: drm device for the ioctl
 692  * @data: data pointer for the ioctl
 693  * @file_priv: drm file for the ioctl call
 694  *
 695  * Build a new CRTC configuration based on user request.
 696  *
 697  * Called by the user via ioctl.
 698  *
 699  * Returns:
 700  * Zero on success, negative errno on failure.
 701  */
 702 int drm_mode_setcrtc(struct drm_device *dev, void *data,
 703                      struct drm_file *file_priv)
 704 {
 705         struct drm_mode_config *config = &dev->mode_config;
 706         struct drm_mode_crtc *crtc_req = data;
 707         struct drm_crtc *crtc;
 708         struct drm_plane *plane;
 709         struct drm_connector **connector_set = NULL, *connector;
 710         struct drm_framebuffer *fb = NULL;
 711         struct drm_display_mode *mode = NULL;
 712         struct drm_mode_set set;
 713         uint32_t __user *set_connectors_ptr;
 714         struct drm_modeset_acquire_ctx ctx;
 715         int ret;
 716         int i;
 717
 718         if (!drm_core_check_feature(dev, DRIVER_MODESET))
 719                 return -EOPNOTSUPP;
 720
 721         /*
 722          * Universal plane src offsets are only 16.16, prevent havoc for
 723          * drivers using universal plane code internally.
 724          */
 725         if (crtc_req->x & 0xffff0000 || crtc_req->y & 0xffff0000)
 726                 return -ERANGE;
 727
 728         crtc = drm_crtc_find(dev, file_priv, crtc_req->crtc_id);
 729         if (!crtc) {
 730                 DRM_DEBUG_KMS("Unknown CRTC ID %d\n", crtc_req->crtc_id);
 731                 return -ENOENT;
 732         }
 733         DRM_DEBUG_KMS("[CRTC:%d:%s]\n", crtc->base.id, crtc->name);
 734
 735         plane = crtc->primary;
 736
 737         /* allow disabling with the primary plane leased */
 738         if (crtc_req->mode_valid && !drm_lease_held(file_priv, plane->base.id))
 739                 return -EACCES;
 740
 741         DRM_MODESET_LOCK_ALL_BEGIN(dev, ctx,
 742                                    DRM_MODESET_ACQUIRE_INTERRUPTIBLE, ret);
 743
 744         if (crtc_req->mode_valid) {
 745                 /* If we have a mode we need a framebuffer. */
 746                 /* If we pass -1, set the mode with the currently bound fb */
 747                 if (crtc_req->fb_id == -1) {
 748                         struct drm_framebuffer *old_fb;
 749
 750                         if (plane->state)
 751                                 old_fb = plane->state->fb;
 752                         else
 753                                 old_fb = plane->fb;
 754
 755                         if (!old_fb) {
 756                                 DRM_DEBUG_KMS("CRTC doesn't have current FB\n");
 757                                 ret = -EINVAL;
 758                                 goto out;
 759                         }
 760
 761                         fb = old_fb;
 762                         /* Make refcounting symmetric with the lookup path. */
 763                         drm_framebuffer_get(fb);
 764                 } else {
 765                         fb = drm_framebuffer_lookup(dev, file_priv, crtc_req->fb_id);
 766                         if (!fb) {
 767                                 DRM_DEBUG_KMS("Unknown FB ID%d\n",
 768                                                 crtc_req->fb_id);
 769                                 ret = -ENOENT;
 770                                 goto out;
 771                         }
 772                 }
 773
 774                 mode = drm_mode_create(dev);
 775                 if (!mode) {
 776                         ret = -ENOMEM;
 777                         goto out;
 778                 }
 779                 if (!file_priv->aspect_ratio_allowed &&
 780                     (crtc_req->mode.flags & DRM_MODE_FLAG_PIC_AR_MASK) != DRM_MODE_FLAG_PIC_AR_NONE) {
 781                         DRM_DEBUG_KMS("Unexpected aspect-ratio flag bits\n");
 782                         ret = -EINVAL;
 783                         goto out;
 784                 }
 785
 786
 787                 ret = drm_mode_convert_umode(dev, mode, &crtc_req->mode);
 788                 if (ret) {
 789                         DRM_DEBUG_KMS("Invalid mode (ret=%d, status=%s)\n",
 790                                       ret, drm_get_mode_status_name(mode->status));
 791                         drm_mode_debug_printmodeline(mode);
 792                         goto out;
 793                 }
 794
 795                 /*
 796                  * Check whether the primary plane supports the fb pixel format.
 797                  * Drivers not implementing the universal planes API use a
 798                  * default formats list provided by the DRM core which doesn't
 799                  * match real hardware capabilities. Skip the check in that
 800                  * case.
 801                  */
 802                 if (!plane->format_default) {
 803                         ret = drm_plane_check_pixel_format(plane,
 804                                                            fb->format->format,
 805                                                            fb->modifier);
 806                         if (ret) {
 807                                 DRM_DEBUG_KMS("Invalid pixel format %p4cc, modifier 0x%llx\n",
 808                                               &fb->format->format,
 809                                               fb->modifier);
 810                                 goto out;
 811                         }
 812                 }
 813
 814                 ret = drm_crtc_check_viewport(crtc, crtc_req->x, crtc_req->y,
 815                                               mode, fb);
 816                 if (ret)
 817                         goto out;
 818
 819         }
 820
 821         if (crtc_req->count_connectors == 0 && mode) {
 822                 DRM_DEBUG_KMS("Count connectors is 0 but mode set\n");
 823                 ret = -EINVAL;
 824                 goto out;
 825         }
 826
 827         if (crtc_req->count_connectors > 0 && (!mode || !fb)) {
 828                 DRM_DEBUG_KMS("Count connectors is %d but no mode or fb set\n",
 829                           crtc_req->count_connectors);
 830                 ret = -EINVAL;
 831                 goto out;
 832         }
 833
 834         if (crtc_req->count_connectors > 0) {
 835                 u32 out_id;
 836
 837                 /* Avoid unbounded kernel memory allocation */
 838                 if (crtc_req->count_connectors > config->num_connector) {
 839                         ret = -EINVAL;
 840                         goto out;
 841                 }
 842
 843                 connector_set = kmalloc_array(crtc_req->count_connectors,
 844                                               sizeof(struct drm_connector *),
 845                                               GFP_KERNEL);
 846                 if (!connector_set) {
 847                         ret = -ENOMEM;
 848                         goto out;
 849                 }
 850
 851                 for (i = 0; i < crtc_req->count_connectors; i++) {
 852                         connector_set[i] = NULL;
 853                         set_connectors_ptr = (uint32_t __user *)(unsigned long)crtc_req->set_connectors_ptr;
 854                         if (get_user(out_id, &set_connectors_ptr[i])) {
 855                                 ret = -EFAULT;
 856                                 goto out;
 857                         }
 858
 859                         connector = drm_connector_lookup(dev, file_priv, out_id);
 860                         if (!connector) {
 861                                 DRM_DEBUG_KMS("Connector id %d unknown\n",
 862                                                 out_id);
 863                                 ret = -ENOENT;
 864                                 goto out;
 865                         }
 866                         DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n",
 867                                         connector->base.id,
 868                                         connector->name);
 869
 870                         connector_set[i] = connector;
 871                 }
 872         }
 873
 874         set.crtc = crtc;
 875         set.x = crtc_req->x;
 876         set.y = crtc_req->y;
 877         set.mode = mode;
 878         set.connectors = connector_set;
 879         set.num_connectors = crtc_req->count_connectors;
 880         set.fb = fb;
 881
 882         if (drm_drv_uses_atomic_modeset(dev))
 883                 ret = crtc->funcs->set_config(&set, &ctx);
 884         else
 885                 ret = __drm_mode_set_config_internal(&set, &ctx);
 886
 887 out:
 888         if (fb)
 889                 drm_framebuffer_put(fb);
 890
 891         if (connector_set) {
 892                 for (i = 0; i < crtc_req->count_connectors; i++) {
 893                         if (connector_set[i])
 894                                 drm_connector_put(connector_set[i]);
 895                 }
 896         }
 897         kfree(connector_set);
 898         drm_mode_destroy(dev, mode);
 899
 900         /* In case we need to retry... */
 901         connector_set = NULL;
 902         fb = NULL;
 903         mode = NULL;
 904
 905         DRM_MODESET_LOCK_ALL_END(dev, ctx, ret);
 906
 907         return ret;
 908 }
 909
 910 int drm_mode_crtc_set_obj_prop(struct drm_mode_object *obj,
 911                                struct drm_property *property,
 912                                uint64_t value)
 913 {
 914         int ret = -EINVAL;
 915         struct drm_crtc *crtc = obj_to_crtc(obj);
 916
 917         if (crtc->funcs->set_property)
 918                 ret = crtc->funcs->set_property(crtc, property, value);
 919         if (!ret)
 920                 drm_object_property_set_value(obj, property, value);
 921
 922         return ret;
 923 }
 924
 925 /**
 926  * drm_crtc_create_scaling_filter_property - create a new scaling filter
 927  * property
 928  *
 929  * @crtc: drm CRTC
 930  * @supported_filters: bitmask of supported scaling filters, must include
 931  *                     BIT(DRM_SCALING_FILTER_DEFAULT).
 932  *
 933  * This function lets driver to enable the scaling filter property on a given
 934  * CRTC.
 935  *
 936  * RETURNS:
 937  * Zero for success or -errno
 938  */
 939 int drm_crtc_create_scaling_filter_property(struct drm_crtc *crtc,
 940                                             unsigned int supported_filters)
 941 {
 942         struct drm_property *prop =
 943                 drm_create_scaling_filter_prop(crtc->dev, supported_filters);
 944
 945         if (IS_ERR(prop))
 946                 return PTR_ERR(prop);
 947
 948         drm_object_attach_property(&crtc->base, prop,
 949                                    DRM_SCALING_FILTER_DEFAULT);
 950         crtc->scaling_filter_property = prop;
 951
 952         return 0;
 953 }
 954 EXPORT_SYMBOL(drm_crtc_create_scaling_filter_property);