drivers/gpu/drm/drm_crtc.c

   1 /*
   2  * Copyright (c) 2006-2008 Intel Corporation
   3  * Copyright (c) 2007 Dave Airlie <[email protected]>
   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 <[email protected]>
  29  *      Dave Airlie <[email protected]>
  30  *      Jesse Barnes <[email protected]>
  31  */
  32 #include <linux/ctype.h>
  33 #include <linux/list.h>
  34 #include <linux/slab.h>
  35 #include <linux/export.h>
  36 #include <linux/dma-fence.h>
  37 #include <linux/uaccess.h>
  38 #include <drm/drm_crtc.h>
  39 #include <drm/drm_edid.h>
  40 #include <drm/drm_fourcc.h>
  41 #include <drm/drm_modeset_lock.h>
  42 #include <drm/drm_atomic.h>
  43 #include <drm/drm_auth.h>
  44 #include <drm/drm_debugfs_crc.h>
  45 #include <drm/drm_drv.h>
  46 #include <drm/drm_print.h>
  47 #include <drm/drm_file.h>
  48
  49 #include "drm_crtc_internal.h"
  50 #include "drm_internal.h"
  51
  52 /**
  53  * DOC: overview
  54  *
  55  * A CRTC represents the overall display pipeline. It receives pixel data from
  56  * &drm_plane and blends them together. The &drm_display_mode is also attached
  57  * to the CRTC, specifying display timings. On the output side the data is fed
  58  * to one or more &drm_encoder, which are then each connected to one
  59  * &drm_connector.
  60  *
  61  * To create a CRTC, a KMS drivers allocates and zeroes an instances of
  62  * &struct drm_crtc (possibly as part of a larger structure) and registers it
  63  * with a call to drm_crtc_init_with_planes().
  64  *
  65  * The CRTC is also the entry point for legacy modeset operations, see
  66  * &drm_crtc_funcs.set_config, legacy plane operations, see
  67  * &drm_crtc_funcs.page_flip and &drm_crtc_funcs.cursor_set2, and other legacy
  68  * operations like &drm_crtc_funcs.gamma_set. For atomic drivers all these
  69  * features are controlled through &drm_property and
  70  * &drm_mode_config_funcs.atomic_check and &drm_mode_config_funcs.atomic_check.
  71  */
  72
  73 /**
  74  * drm_crtc_from_index - find the registered CRTC at an index
  75  * @dev: DRM device
  76  * @idx: index of registered CRTC to find for
  77  *
  78  * Given a CRTC index, return the registered CRTC from DRM device's
  79  * list of CRTCs with matching index. This is the inverse of drm_crtc_index().
  80  * It's useful in the vblank callbacks (like &drm_driver.enable_vblank or
  81  * &drm_driver.disable_vblank), since that still deals with indices instead
  82  * of pointers to &struct drm_crtc."
  83  */
  84 struct drm_crtc *drm_crtc_from_index(struct drm_device *dev, int idx)
  85 {
  86         struct drm_crtc *crtc;
  87
  88         drm_for_each_crtc(crtc, dev)
  89                 if (idx == crtc->index)
  90                         return crtc;
  91
  92         return NULL;
  93 }
  94 EXPORT_SYMBOL(drm_crtc_from_index);
  95
  96 /**
  97  * drm_crtc_force_disable - Forcibly turn off a CRTC
  98  * @crtc: CRTC to turn off
  99  *
 100  * Note: This should only be used by non-atomic legacy drivers.
 101  *
 102  * Returns:
 103  * Zero on success, error code on failure.
 104  */
 105 int drm_crtc_force_disable(struct drm_crtc *crtc)
 106 {
 107         struct drm_mode_set set = {
 108                 .crtc = crtc,
 109         };
 110
 111         WARN_ON(drm_drv_uses_atomic_modeset(crtc->dev));
 112
 113         return drm_mode_set_config_internal(&set);
 114 }
 115 EXPORT_SYMBOL(drm_crtc_force_disable);
 116
 117 /**
 118  * drm_crtc_force_disable_all - Forcibly turn off all enabled CRTCs
 119  * @dev: DRM device whose CRTCs to turn off
 120  *
 121  * Drivers may want to call this on unload to ensure that all displays are
 122  * unlit and the GPU is in a consistent, low power state. Takes modeset locks.
 123  *
 124  * Note: This should only be used by non-atomic legacy drivers. For an atomic
 125  * version look at drm_atomic_helper_shutdown().
 126  *
 127  * Returns:
 128  * Zero on success, error code on failure.
 129  */
 130 int drm_crtc_force_disable_all(struct drm_device *dev)
 131 {
 132         struct drm_crtc *crtc;
 133         int ret = 0;
 134
 135         drm_modeset_lock_all(dev);
 136         drm_for_each_crtc(crtc, dev)
 137                 if (crtc->enabled) {
 138                         ret = drm_crtc_force_disable(crtc);
 139                         if (ret)
 140                                 goto out;
 141                 }
 142 out:
 143         drm_modeset_unlock_all(dev);
 144         return ret;
 145 }
 146 EXPORT_SYMBOL(drm_crtc_force_disable_all);
 147
 148 static unsigned int drm_num_crtcs(struct drm_device *dev)
 149 {
 150         unsigned int num = 0;
 151         struct drm_crtc *tmp;
 152
 153         drm_for_each_crtc(tmp, dev) {
 154                 num++;
 155         }
 156
 157         return num;
 158 }
 159
 160 int drm_crtc_register_all(struct drm_device *dev)
 161 {
 162         struct drm_crtc *crtc;
 163         int ret = 0;
 164
 165         drm_for_each_crtc(crtc, dev) {
 166                 if (drm_debugfs_crtc_add(crtc))
 167                         DRM_ERROR("Failed to initialize debugfs entry for CRTC '%s'.\n",
 168                                   crtc->name);
 169
 170                 if (crtc->funcs->late_register)
 171                         ret = crtc->funcs->late_register(crtc);
 172                 if (ret)
 173                         return ret;
 174         }
 175
 176         return 0;
 177 }
 178
 179 void drm_crtc_unregister_all(struct drm_device *dev)
 180 {
 181         struct drm_crtc *crtc;
 182
 183         drm_for_each_crtc(crtc, dev) {
 184                 if (crtc->funcs->early_unregister)
 185                         crtc->funcs->early_unregister(crtc);
 186                 drm_debugfs_crtc_remove(crtc);
 187         }
 188 }
 189
 190 static int drm_crtc_crc_init(struct drm_crtc *crtc)
 191 {
 192 #ifdef CONFIG_DEBUG_FS
 193         spin_lock_init(&crtc->crc.lock);
 194         init_waitqueue_head(&crtc->crc.wq);
 195         crtc->crc.source = kstrdup("auto", GFP_KERNEL);
 196         if (!crtc->crc.source)
 197                 return -ENOMEM;
 198 #endif
 199         return 0;
 200 }
 201
 202 static void drm_crtc_crc_fini(struct drm_crtc *crtc)
 203 {
 204 #ifdef CONFIG_DEBUG_FS
 205         kfree(crtc->crc.source);
 206 #endif
 207 }
 208
 209 static const struct dma_fence_ops drm_crtc_fence_ops;
 210
 211 static struct drm_crtc *fence_to_crtc(struct dma_fence *fence)
 212 {
 213         BUG_ON(fence->ops != &drm_crtc_fence_ops);
 214         return container_of(fence->lock, struct drm_crtc, fence_lock);
 215 }
 216
 217 static const char *drm_crtc_fence_get_driver_name(struct dma_fence *fence)
 218 {
 219         struct drm_crtc *crtc = fence_to_crtc(fence);
 220
 221         return crtc->dev->driver->name;
 222 }
 223
 224 static const char *drm_crtc_fence_get_timeline_name(struct dma_fence *fence)
 225 {
 226         struct drm_crtc *crtc = fence_to_crtc(fence);
 227
 228         return crtc->timeline_name;
 229 }
 230
 231 static const struct dma_fence_ops drm_crtc_fence_ops = {
 232         .get_driver_name = drm_crtc_fence_get_driver_name,
 233         .get_timeline_name = drm_crtc_fence_get_timeline_name,
 234 };
 235
 236 struct dma_fence *drm_crtc_create_fence(struct drm_crtc *crtc)
 237 {
 238         struct dma_fence *fence;
 239
 240         fence = kzalloc(sizeof(*fence), GFP_KERNEL);
 241         if (!fence)
 242                 return NULL;
 243
 244         dma_fence_init(fence, &drm_crtc_fence_ops, &crtc->fence_lock,
 245                        crtc->fence_context, ++crtc->fence_seqno);
 246
 247         return fence;
 248 }
 249
 250 /**
 251  * drm_crtc_init_with_planes - Initialise a new CRTC object with
 252  *    specified primary and cursor planes.
 253  * @dev: DRM device
 254  * @crtc: CRTC object to init
 255  * @primary: Primary plane for CRTC
 256  * @cursor: Cursor plane for CRTC
 257  * @funcs: callbacks for the new CRTC
 258  * @name: printf style format string for the CRTC name, or NULL for default name
 259  *
 260  * Inits a new object created as base part of a driver crtc object. Drivers
 261  * should use this function instead of drm_crtc_init(), which is only provided
 262  * for backwards compatibility with drivers which do not yet support universal
 263  * planes). For really simple hardware which has only 1 plane look at
 264  * drm_simple_display_pipe_init() instead.
 265  *
 266  * Returns:
 267  * Zero on success, error code on failure.
 268  */
 269 int drm_crtc_init_with_planes(struct drm_device *dev, struct drm_crtc *crtc,
 270                               struct drm_plane *primary,
 271                               struct drm_plane *cursor,
 272                               const struct drm_crtc_funcs *funcs,
 273                               const char *name, ...)
 274 {
 275         struct drm_mode_config *config = &dev->mode_config;
 276         int ret;
 277
 278         WARN_ON(primary && primary->type != DRM_PLANE_TYPE_PRIMARY);
 279         WARN_ON(cursor && cursor->type != DRM_PLANE_TYPE_CURSOR);
 280
 281         /* crtc index is used with 32bit bitmasks */
 282         if (WARN_ON(config->num_crtc >= 32))
 283                 return -EINVAL;
 284
 285         WARN_ON(drm_drv_uses_atomic_modeset(dev) &&
 286                 (!funcs->atomic_destroy_state ||
 287                  !funcs->atomic_duplicate_state));
 288
 289         crtc->dev = dev;
 290         crtc->funcs = funcs;
 291
 292         INIT_LIST_HEAD(&crtc->commit_list);
 293         spin_lock_init(&crtc->commit_lock);
 294
 295         drm_modeset_lock_init(&crtc->mutex);
 296         ret = drm_mode_object_add(dev, &crtc->base, DRM_MODE_OBJECT_CRTC);
 297         if (ret)
 298                 return ret;
 299
 300         if (name) {
 301                 va_list ap;
 302
 303                 va_start(ap, name);
 304                 crtc->name = kvasprintf(GFP_KERNEL, name, ap);
 305                 va_end(ap);
 306         } else {
 307                 crtc->name = kasprintf(GFP_KERNEL, "crtc-%d",
 308                                        drm_num_crtcs(dev));
 309         }
 310         if (!crtc->name) {
 311                 drm_mode_object_unregister(dev, &crtc->base);
 312                 return -ENOMEM;
 313         }
 314
 315         crtc->fence_context = dma_fence_context_alloc(1);
 316         spin_lock_init(&crtc->fence_lock);
 317         snprintf(crtc->timeline_name, sizeof(crtc->timeline_name),
 318                  "CRTC:%d-%s", crtc->base.id, crtc->name);
 319
 320         crtc->base.properties = &crtc->properties;
 321
 322         list_add_tail(&crtc->head, &config->crtc_list);
 323         crtc->index = config->num_crtc++;
 324
 325         crtc->primary = primary;
 326         crtc->cursor = cursor;
 327         if (primary && !primary->possible_crtcs)
 328                 primary->possible_crtcs = drm_crtc_mask(crtc);
 329         if (cursor && !cursor->possible_crtcs)
 330                 cursor->possible_crtcs = drm_crtc_mask(crtc);
 331
 332         ret = drm_crtc_crc_init(crtc);
 333         if (ret) {
 334                 drm_mode_object_unregister(dev, &crtc->base);
 335                 return ret;
 336         }
 337
 338         if (drm_core_check_feature(dev, DRIVER_ATOMIC)) {
 339                 drm_object_attach_property(&crtc->base, config->prop_active, 0);
 340                 drm_object_attach_property(&crtc->base, config->prop_mode_id, 0);
 341                 drm_object_attach_property(&crtc->base,
 342                                            config->prop_out_fence_ptr, 0);
 343         }
 344
 345         return 0;
 346 }
 347 EXPORT_SYMBOL(drm_crtc_init_with_planes);
 348
 349 /**
 350  * drm_crtc_cleanup - Clean up the core crtc usage
 351  * @crtc: CRTC to cleanup
 352  *
 353  * This function cleans up @crtc and removes it from the DRM mode setting
 354  * core. Note that the function does *not* free the crtc structure itself,
 355  * this is the responsibility of the caller.
 356  */
 357 void drm_crtc_cleanup(struct drm_crtc *crtc)
 358 {
 359         struct drm_device *dev = crtc->dev;
 360
 361         /* Note that the crtc_list is considered to be static; should we
 362          * remove the drm_crtc at runtime we would have to decrement all
 363          * the indices on the drm_crtc after us in the crtc_list.
 364          */
 365
 366         drm_crtc_crc_fini(crtc);
 367
 368         kfree(crtc->gamma_store);
 369         crtc->gamma_store = NULL;
 370
 371         drm_modeset_lock_fini(&crtc->mutex);
 372
 373         drm_mode_object_unregister(dev, &crtc->base);
 374         list_del(&crtc->head);
 375         dev->mode_config.num_crtc--;
 376
 377         WARN_ON(crtc->state && !crtc->funcs->atomic_destroy_state);
 378         if (crtc->state && crtc->funcs->atomic_destroy_state)
 379                 crtc->funcs->atomic_destroy_state(crtc, crtc->state);
 380
 381         kfree(crtc->name);
 382
 383         memset(crtc, 0, sizeof(*crtc));
 384 }
 385 EXPORT_SYMBOL(drm_crtc_cleanup);
 386
 387 /**
 388  * drm_mode_getcrtc - get CRTC configuration
 389  * @dev: drm device for the ioctl
 390  * @data: data pointer for the ioctl
 391  * @file_priv: drm file for the ioctl call
 392  *
 393  * Construct a CRTC configuration structure to return to the user.
 394  *
 395  * Called by the user via ioctl.
 396  *
 397  * Returns:
 398  * Zero on success, negative errno on failure.
 399  */
 400 int drm_mode_getcrtc(struct drm_device *dev,
 401                      void *data, struct drm_file *file_priv)
 402 {
 403         struct drm_mode_crtc *crtc_resp = data;
 404         struct drm_crtc *crtc;
 405         struct drm_plane *plane;
 406
 407         if (!drm_core_check_feature(dev, DRIVER_MODESET))
 408                 return -EOPNOTSUPP;
 409
 410         crtc = drm_crtc_find(dev, file_priv, crtc_resp->crtc_id);
 411         if (!crtc)
 412                 return -ENOENT;
 413
 414         plane = crtc->primary;
 415
 416         crtc_resp->gamma_size = crtc->gamma_size;
 417
 418         drm_modeset_lock(&plane->mutex, NULL);
 419         if (plane->state && plane->state->fb)
 420                 crtc_resp->fb_id = plane->state->fb->base.id;
 421         else if (!plane->state && plane->fb)
 422                 crtc_resp->fb_id = plane->fb->base.id;
 423         else
 424                 crtc_resp->fb_id = 0;
 425
 426         if (plane->state) {
 427                 crtc_resp->x = plane->state->src_x >> 16;
 428                 crtc_resp->y = plane->state->src_y >> 16;
 429         }
 430         drm_modeset_unlock(&plane->mutex);
 431
 432         drm_modeset_lock(&crtc->mutex, NULL);
 433         if (crtc->state) {
 434                 if (crtc->state->enable) {
 435                         drm_mode_convert_to_umode(&crtc_resp->mode, &crtc->state->mode);
 436                         crtc_resp->mode_valid = 1;
 437                 } else {
 438                         crtc_resp->mode_valid = 0;
 439                 }
 440         } else {
 441                 crtc_resp->x = crtc->x;
 442                 crtc_resp->y = crtc->y;
 443
 444                 if (crtc->enabled) {
 445                         drm_mode_convert_to_umode(&crtc_resp->mode, &crtc->mode);
 446                         crtc_resp->mode_valid = 1;
 447
 448                 } else {
 449                         crtc_resp->mode_valid = 0;
 450                 }
 451         }
 452         if (!file_priv->aspect_ratio_allowed)
 453                 crtc_resp->mode.flags &= ~DRM_MODE_FLAG_PIC_AR_MASK;
 454         drm_modeset_unlock(&crtc->mutex);
 455
 456         return 0;
 457 }
 458
 459 static int __drm_mode_set_config_internal(struct drm_mode_set *set,
 460                                           struct drm_modeset_acquire_ctx *ctx)
 461 {
 462         struct drm_crtc *crtc = set->crtc;
 463         struct drm_framebuffer *fb;
 464         struct drm_crtc *tmp;
 465         int ret;
 466
 467         WARN_ON(drm_drv_uses_atomic_modeset(crtc->dev));
 468
 469         /*
 470          * NOTE: ->set_config can also disable other crtcs (if we steal all
 471          * connectors from it), hence we need to refcount the fbs across all
 472          * crtcs. Atomic modeset will have saner semantics ...
 473          */
 474         drm_for_each_crtc(tmp, crtc->dev) {
 475                 struct drm_plane *plane = tmp->primary;
 476
 477                 plane->old_fb = plane->fb;
 478         }
 479
 480         fb = set->fb;
 481
 482         ret = crtc->funcs->set_config(set, ctx);
 483         if (ret == 0) {
 484                 struct drm_plane *plane = crtc->primary;
 485
 486                 plane->crtc = fb ? crtc : NULL;
 487                 plane->fb = fb;
 488         }
 489
 490         drm_for_each_crtc(tmp, crtc->dev) {
 491                 struct drm_plane *plane = tmp->primary;
 492
 493                 if (plane->fb)
 494                         drm_framebuffer_get(plane->fb);
 495                 if (plane->old_fb)
 496                         drm_framebuffer_put(plane->old_fb);
 497                 plane->old_fb = NULL;
 498         }
 499
 500         return ret;
 501 }
 502
 503 /**
 504  * drm_mode_set_config_internal - helper to call &drm_mode_config_funcs.set_config
 505  * @set: modeset config to set
 506  *
 507  * This is a little helper to wrap internal calls to the
 508  * &drm_mode_config_funcs.set_config driver interface. The only thing it adds is
 509  * correct refcounting dance.
 510  *
 511  * This should only be used by non-atomic legacy drivers.
 512  *
 513  * Returns:
 514  * Zero on success, negative errno on failure.
 515  */
 516 int drm_mode_set_config_internal(struct drm_mode_set *set)
 517 {
 518         WARN_ON(drm_drv_uses_atomic_modeset(set->crtc->dev));
 519
 520         return __drm_mode_set_config_internal(set, NULL);
 521 }
 522 EXPORT_SYMBOL(drm_mode_set_config_internal);
 523
 524 /**
 525  * drm_crtc_check_viewport - Checks that a framebuffer is big enough for the
 526  *     CRTC viewport
 527  * @crtc: CRTC that framebuffer will be displayed on
 528  * @x: x panning
 529  * @y: y panning
 530  * @mode: mode that framebuffer will be displayed under
 531  * @fb: framebuffer to check size of
 532  */
 533 int drm_crtc_check_viewport(const struct drm_crtc *crtc,
 534                             int x, int y,
 535                             const struct drm_display_mode *mode,
 536                             const struct drm_framebuffer *fb)
 537
 538 {
 539         int hdisplay, vdisplay;
 540
 541         drm_mode_get_hv_timing(mode, &hdisplay, &vdisplay);
 542
 543         if (crtc->state &&
 544             drm_rotation_90_or_270(crtc->primary->state->rotation))
 545                 swap(hdisplay, vdisplay);
 546
 547         return drm_framebuffer_check_src_coords(x << 16, y << 16,
 548                                                 hdisplay << 16, vdisplay << 16,
 549                                                 fb);
 550 }
 551 EXPORT_SYMBOL(drm_crtc_check_viewport);
 552
 553 /**
 554  * drm_mode_setcrtc - set CRTC configuration
 555  * @dev: drm device for the ioctl
 556  * @data: data pointer for the ioctl
 557  * @file_priv: drm file for the ioctl call
 558  *
 559  * Build a new CRTC configuration based on user request.
 560  *
 561  * Called by the user via ioctl.
 562  *
 563  * Returns:
 564  * Zero on success, negative errno on failure.
 565  */
 566 int drm_mode_setcrtc(struct drm_device *dev, void *data,
 567                      struct drm_file *file_priv)
 568 {
 569         struct drm_mode_config *config = &dev->mode_config;
 570         struct drm_mode_crtc *crtc_req = data;
 571         struct drm_crtc *crtc;
 572         struct drm_plane *plane;
 573         struct drm_connector **connector_set, *connector;
 574         struct drm_framebuffer *fb;
 575         struct drm_display_mode *mode;
 576         struct drm_mode_set set;
 577         uint32_t __user *set_connectors_ptr;
 578         struct drm_modeset_acquire_ctx ctx;
 579         int ret;
 580         int i;
 581
 582         if (!drm_core_check_feature(dev, DRIVER_MODESET))
 583                 return -EOPNOTSUPP;
 584
 585         /*
 586          * Universal plane src offsets are only 16.16, prevent havoc for
 587          * drivers using universal plane code internally.
 588          */
 589         if (crtc_req->x & 0xffff0000 || crtc_req->y & 0xffff0000)
 590                 return -ERANGE;
 591
 592         crtc = drm_crtc_find(dev, file_priv, crtc_req->crtc_id);
 593         if (!crtc) {
 594                 DRM_DEBUG_KMS("Unknown CRTC ID %d\n", crtc_req->crtc_id);
 595                 return -ENOENT;
 596         }
 597         DRM_DEBUG_KMS("[CRTC:%d:%s]\n", crtc->base.id, crtc->name);
 598
 599         plane = crtc->primary;
 600
 601         mutex_lock(&crtc->dev->mode_config.mutex);
 602         drm_modeset_acquire_init(&ctx, DRM_MODESET_ACQUIRE_INTERRUPTIBLE);
 603 retry:
 604         connector_set = NULL;
 605         fb = NULL;
 606         mode = NULL;
 607
 608         ret = drm_modeset_lock_all_ctx(crtc->dev, &ctx);
 609         if (ret)
 610                 goto out;
 611
 612         if (crtc_req->mode_valid) {
 613                 /* If we have a mode we need a framebuffer. */
 614                 /* If we pass -1, set the mode with the currently bound fb */
 615                 if (crtc_req->fb_id == -1) {
 616                         struct drm_framebuffer *old_fb;
 617
 618                         if (plane->state)
 619                                 old_fb = plane->state->fb;
 620                         else
 621                                 old_fb = plane->fb;
 622
 623                         if (!old_fb) {
 624                                 DRM_DEBUG_KMS("CRTC doesn't have current FB\n");
 625                                 ret = -EINVAL;
 626                                 goto out;
 627                         }
 628
 629                         fb = old_fb;
 630                         /* Make refcounting symmetric with the lookup path. */
 631                         drm_framebuffer_get(fb);
 632                 } else {
 633                         fb = drm_framebuffer_lookup(dev, file_priv, crtc_req->fb_id);
 634                         if (!fb) {
 635                                 DRM_DEBUG_KMS("Unknown FB ID%d\n",
 636                                                 crtc_req->fb_id);
 637                                 ret = -ENOENT;
 638                                 goto out;
 639                         }
 640                 }
 641
 642                 mode = drm_mode_create(dev);
 643                 if (!mode) {
 644                         ret = -ENOMEM;
 645                         goto out;
 646                 }
 647                 if (!file_priv->aspect_ratio_allowed &&
 648                     (crtc_req->mode.flags & DRM_MODE_FLAG_PIC_AR_MASK) != DRM_MODE_FLAG_PIC_AR_NONE) {
 649                         DRM_DEBUG_KMS("Unexpected aspect-ratio flag bits\n");
 650                         ret = -EINVAL;
 651                         goto out;
 652                 }
 653
 654
 655                 ret = drm_mode_convert_umode(dev, mode, &crtc_req->mode);
 656                 if (ret) {
 657                         DRM_DEBUG_KMS("Invalid mode (ret=%d, status=%s)\n",
 658                                       ret, drm_get_mode_status_name(mode->status));
 659                         drm_mode_debug_printmodeline(mode);
 660                         goto out;
 661                 }
 662
 663                 /*
 664                  * Check whether the primary plane supports the fb pixel format.
 665                  * Drivers not implementing the universal planes API use a
 666                  * default formats list provided by the DRM core which doesn't
 667                  * match real hardware capabilities. Skip the check in that
 668                  * case.
 669                  */
 670                 if (!plane->format_default) {
 671                         ret = drm_plane_check_pixel_format(plane,
 672                                                            fb->format->format,
 673                                                            fb->modifier);
 674                         if (ret) {
 675                                 struct drm_format_name_buf format_name;
 676                                 DRM_DEBUG_KMS("Invalid pixel format %s, modifier 0x%llx\n",
 677                                               drm_get_format_name(fb->format->format,
 678                                                                   &format_name),
 679                                               fb->modifier);
 680                                 goto out;
 681                         }
 682                 }
 683
 684                 ret = drm_crtc_check_viewport(crtc, crtc_req->x, crtc_req->y,
 685                                               mode, fb);
 686                 if (ret)
 687                         goto out;
 688
 689         }
 690
 691         if (crtc_req->count_connectors == 0 && mode) {
 692                 DRM_DEBUG_KMS("Count connectors is 0 but mode set\n");
 693                 ret = -EINVAL;
 694                 goto out;
 695         }
 696
 697         if (crtc_req->count_connectors > 0 && (!mode || !fb)) {
 698                 DRM_DEBUG_KMS("Count connectors is %d but no mode or fb set\n",
 699                           crtc_req->count_connectors);
 700                 ret = -EINVAL;
 701                 goto out;
 702         }
 703
 704         if (crtc_req->count_connectors > 0) {
 705                 u32 out_id;
 706
 707                 /* Avoid unbounded kernel memory allocation */
 708                 if (crtc_req->count_connectors > config->num_connector) {
 709                         ret = -EINVAL;
 710                         goto out;
 711                 }
 712
 713                 connector_set = kmalloc_array(crtc_req->count_connectors,
 714                                               sizeof(struct drm_connector *),
 715                                               GFP_KERNEL);
 716                 if (!connector_set) {
 717                         ret = -ENOMEM;
 718                         goto out;
 719                 }
 720
 721                 for (i = 0; i < crtc_req->count_connectors; i++) {
 722                         connector_set[i] = NULL;
 723                         set_connectors_ptr = (uint32_t __user *)(unsigned long)crtc_req->set_connectors_ptr;
 724                         if (get_user(out_id, &set_connectors_ptr[i])) {
 725                                 ret = -EFAULT;
 726                                 goto out;
 727                         }
 728
 729                         connector = drm_connector_lookup(dev, file_priv, out_id);
 730                         if (!connector) {
 731                                 DRM_DEBUG_KMS("Connector id %d unknown\n",
 732                                                 out_id);
 733                                 ret = -ENOENT;
 734                                 goto out;
 735                         }
 736                         DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n",
 737                                         connector->base.id,
 738                                         connector->name);
 739
 740                         connector_set[i] = connector;
 741                 }
 742         }
 743
 744         set.crtc = crtc;
 745         set.x = crtc_req->x;
 746         set.y = crtc_req->y;
 747         set.mode = mode;
 748         set.connectors = connector_set;
 749         set.num_connectors = crtc_req->count_connectors;
 750         set.fb = fb;
 751
 752         if (drm_drv_uses_atomic_modeset(dev))
 753                 ret = crtc->funcs->set_config(&set, &ctx);
 754         else
 755                 ret = __drm_mode_set_config_internal(&set, &ctx);
 756
 757 out:
 758         if (fb)
 759                 drm_framebuffer_put(fb);
 760
 761         if (connector_set) {
 762                 for (i = 0; i < crtc_req->count_connectors; i++) {
 763                         if (connector_set[i])
 764                                 drm_connector_put(connector_set[i]);
 765                 }
 766         }
 767         kfree(connector_set);
 768         drm_mode_destroy(dev, mode);
 769         if (ret == -EDEADLK) {
 770                 ret = drm_modeset_backoff(&ctx);
 771                 if (!ret)
 772                         goto retry;
 773         }
 774         drm_modeset_drop_locks(&ctx);
 775         drm_modeset_acquire_fini(&ctx);
 776         mutex_unlock(&crtc->dev->mode_config.mutex);
 777
 778         return ret;
 779 }
 780
 781 int drm_mode_crtc_set_obj_prop(struct drm_mode_object *obj,
 782                                struct drm_property *property,
 783                                uint64_t value)
 784 {
 785         int ret = -EINVAL;
 786         struct drm_crtc *crtc = obj_to_crtc(obj);
 787
 788         if (crtc->funcs->set_property)
 789                 ret = crtc->funcs->set_property(crtc, property, value);
 790         if (!ret)
 791                 drm_object_property_set_value(obj, property, value);
 792
 793         return ret;
 794 }