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