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 <drm/drmP.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
  46 #include "drm_crtc_internal.h"
  47 #include "drm_internal.h"
  48
  49 /**
  50  * DOC: overview
  51  *
  52  * A CRTC represents the overall display pipeline. It receives pixel data from
  53  * &drm_plane and blends them together. The &drm_display_mode is also attached
  54  * to the CRTC, specifying display timings. On the output side the data is fed
  55  * to one or more &drm_encoder, which are then each connected to one
  56  * &drm_connector.
  57  *
  58  * To create a CRTC, a KMS drivers allocates and zeroes an instances of
  59  * &struct drm_crtc (possibly as part of a larger structure) and registers it
  60  * with a call to drm_crtc_init_with_planes().
  61  *
  62  * The CRTC is also the entry point for legacy modeset operations, see
  63  * &drm_crtc_funcs.set_config, legacy plane operations, see
  64  * &drm_crtc_funcs.page_flip and &drm_crtc_funcs.cursor_set2, and other legacy
  65  * operations like &drm_crtc_funcs.gamma_set. For atomic drivers all these
  66  * features are controlled through &drm_property and
  67  * &drm_mode_config_funcs.atomic_check and &drm_mode_config_funcs.atomic_check.
  68  */
  69
  70 /**
  71  * drm_crtc_from_index - find the registered CRTC at an index
  72  * @dev: DRM device
  73  * @idx: index of registered CRTC to find for
  74  *
  75  * Given a CRTC index, return the registered CRTC from DRM device's
  76  * list of CRTCs with matching index. This is the inverse of drm_crtc_index().
  77  * It's useful in the vblank callbacks (like &drm_driver.enable_vblank or
  78  * &drm_driver.disable_vblank), since that still deals with indices instead
  79  * of pointers to &struct drm_crtc."
  80  */
  81 struct drm_crtc *drm_crtc_from_index(struct drm_device *dev, int idx)
  82 {
  83         struct drm_crtc *crtc;
  84
  85         drm_for_each_crtc(crtc, dev)
  86                 if (idx == crtc->index)
  87                         return crtc;
  88
  89         return NULL;
  90 }
  91 EXPORT_SYMBOL(drm_crtc_from_index);
  92
  93 /**
  94  * drm_crtc_force_disable - Forcibly turn off a CRTC
  95  * @crtc: CRTC to turn off
  96  *
  97  * Note: This should only be used by non-atomic legacy drivers.
  98  *
  99  * Returns:
 100  * Zero on success, error code on failure.
 101  */
 102 int drm_crtc_force_disable(struct drm_crtc *crtc)
 103 {
 104         struct drm_mode_set set = {
 105                 .crtc = crtc,
 106         };
 107
 108         WARN_ON(drm_drv_uses_atomic_modeset(crtc->dev));
 109
 110         return drm_mode_set_config_internal(&set);
 111 }
 112 EXPORT_SYMBOL(drm_crtc_force_disable);
 113
 114 /**
 115  * drm_crtc_force_disable_all - Forcibly turn off all enabled CRTCs
 116  * @dev: DRM device whose CRTCs to turn off
 117  *
 118  * Drivers may want to call this on unload to ensure that all displays are
 119  * unlit and the GPU is in a consistent, low power state. Takes modeset locks.
 120  *
 121  * Note: This should only be used by non-atomic legacy drivers. For an atomic
 122  * version look at drm_atomic_helper_shutdown().
 123  *
 124  * Returns:
 125  * Zero on success, error code on failure.
 126  */
 127 int drm_crtc_force_disable_all(struct drm_device *dev)
 128 {
 129         struct drm_crtc *crtc;
 130         int ret = 0;
 131
 132         drm_modeset_lock_all(dev);
 133         drm_for_each_crtc(crtc, dev)
 134                 if (crtc->enabled) {
 135                         ret = drm_crtc_force_disable(crtc);
 136                         if (ret)
 137                                 goto out;
 138                 }
 139 out:
 140         drm_modeset_unlock_all(dev);
 141         return ret;
 142 }
 143 EXPORT_SYMBOL(drm_crtc_force_disable_all);
 144
 145 static unsigned int drm_num_crtcs(struct drm_device *dev)
 146 {
 147         unsigned int num = 0;
 148         struct drm_crtc *tmp;
 149
 150         drm_for_each_crtc(tmp, dev) {
 151                 num++;
 152         }
 153
 154         return num;
 155 }
 156
 157 int drm_crtc_register_all(struct drm_device *dev)
 158 {
 159         struct drm_crtc *crtc;
 160         int ret = 0;
 161
 162         drm_for_each_crtc(crtc, dev) {
 163                 if (drm_debugfs_crtc_add(crtc))
 164                         DRM_ERROR("Failed to initialize debugfs entry for CRTC '%s'.\n",
 165                                   crtc->name);
 166
 167                 if (crtc->funcs->late_register)
 168                         ret = crtc->funcs->late_register(crtc);
 169                 if (ret)
 170                         return ret;
 171         }
 172
 173         return 0;
 174 }
 175
 176 void drm_crtc_unregister_all(struct drm_device *dev)
 177 {
 178         struct drm_crtc *crtc;
 179
 180         drm_for_each_crtc(crtc, dev) {
 181                 if (crtc->funcs->early_unregister)
 182                         crtc->funcs->early_unregister(crtc);
 183                 drm_debugfs_crtc_remove(crtc);
 184         }
 185 }
 186
 187 static int drm_crtc_crc_init(struct drm_crtc *crtc)
 188 {
 189 #ifdef CONFIG_DEBUG_FS
 190         spin_lock_init(&crtc->crc.lock);
 191         init_waitqueue_head(&crtc->crc.wq);
 192         crtc->crc.source = kstrdup("auto", GFP_KERNEL);
 193         if (!crtc->crc.source)
 194                 return -ENOMEM;
 195 #endif
 196         return 0;
 197 }
 198
 199 static void drm_crtc_crc_fini(struct drm_crtc *crtc)
 200 {
 201 #ifdef CONFIG_DEBUG_FS
 202         kfree(crtc->crc.source);
 203 #endif
 204 }
 205
 206 static const struct dma_fence_ops drm_crtc_fence_ops;
 207
 208 static struct drm_crtc *fence_to_crtc(struct dma_fence *fence)
 209 {
 210         BUG_ON(fence->ops != &drm_crtc_fence_ops);
 211         return container_of(fence->lock, struct drm_crtc, fence_lock);
 212 }
 213
 214 static const char *drm_crtc_fence_get_driver_name(struct dma_fence *fence)
 215 {
 216         struct drm_crtc *crtc = fence_to_crtc(fence);
 217
 218         return crtc->dev->driver->name;
 219 }
 220
 221 static const char *drm_crtc_fence_get_timeline_name(struct dma_fence *fence)
 222 {
 223         struct drm_crtc *crtc = fence_to_crtc(fence);
 224
 225         return crtc->timeline_name;
 226 }
 227
 228 static bool drm_crtc_fence_enable_signaling(struct dma_fence *fence)
 229 {
 230         return true;
 231 }
 232
 233 static const struct dma_fence_ops drm_crtc_fence_ops = {
 234         .get_driver_name = drm_crtc_fence_get_driver_name,
 235         .get_timeline_name = drm_crtc_fence_get_timeline_name,
 236         .enable_signaling = drm_crtc_fence_enable_signaling,
 237         .wait = dma_fence_default_wait,
 238 };
 239
 240 struct dma_fence *drm_crtc_create_fence(struct drm_crtc *crtc)
 241 {
 242         struct dma_fence *fence;
 243
 244         fence = kzalloc(sizeof(*fence), GFP_KERNEL);
 245         if (!fence)
 246                 return NULL;
 247
 248         dma_fence_init(fence, &drm_crtc_fence_ops, &crtc->fence_lock,
 249                        crtc->fence_context, ++crtc->fence_seqno);
 250
 251         return fence;
 252 }
 253
 254 /**
 255  * drm_crtc_init_with_planes - Initialise a new CRTC object with
 256  *    specified primary and cursor planes.
 257  * @dev: DRM device
 258  * @crtc: CRTC object to init
 259  * @primary: Primary plane for CRTC
 260  * @cursor: Cursor plane for CRTC
 261  * @funcs: callbacks for the new CRTC
 262  * @name: printf style format string for the CRTC name, or NULL for default name
 263  *
 264  * Inits a new object created as base part of a driver crtc object. Drivers
 265  * should use this function instead of drm_crtc_init(), which is only provided
 266  * for backwards compatibility with drivers which do not yet support universal
 267  * planes). For really simple hardware which has only 1 plane look at
 268  * drm_simple_display_pipe_init() instead.
 269  *
 270  * Returns:
 271  * Zero on success, error code on failure.
 272  */
 273 int drm_crtc_init_with_planes(struct drm_device *dev, struct drm_crtc *crtc,
 274                               struct drm_plane *primary,
 275                               struct drm_plane *cursor,
 276                               const struct drm_crtc_funcs *funcs,
 277                               const char *name, ...)
 278 {
 279         struct drm_mode_config *config = &dev->mode_config;
 280         int ret;
 281
 282         WARN_ON(primary && primary->type != DRM_PLANE_TYPE_PRIMARY);
 283         WARN_ON(cursor && cursor->type != DRM_PLANE_TYPE_CURSOR);
 284
 285         /* crtc index is used with 32bit bitmasks */
 286         if (WARN_ON(config->num_crtc >= 32))
 287                 return -EINVAL;
 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 = 1 << drm_crtc_index(crtc);
 329         if (cursor && !cursor->possible_crtcs)
 330                 cursor->possible_crtcs = 1 << drm_crtc_index(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 -EINVAL;
 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         /*
 468          * NOTE: ->set_config can also disable other crtcs (if we steal all
 469          * connectors from it), hence we need to refcount the fbs across all
 470          * crtcs. Atomic modeset will have saner semantics ...
 471          */
 472         drm_for_each_crtc(tmp, crtc->dev) {
 473                 struct drm_plane *plane = tmp->primary;
 474
 475                 plane->old_fb = plane->fb;
 476         }
 477
 478         fb = set->fb;
 479
 480         ret = crtc->funcs->set_config(set, ctx);
 481         if (ret == 0) {
 482                 struct drm_plane *plane = crtc->primary;
 483
 484                 if (!plane->state) {
 485                         plane->crtc = fb ? crtc : NULL;
 486                         plane->fb = fb;
 487                 }
 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  * drm_mode_set_config_internal - helper to call &drm_mode_config_funcs.set_config
 504  * @set: modeset config to set
 505  *
 506  * This is a little helper to wrap internal calls to the
 507  * &drm_mode_config_funcs.set_config driver interface. The only thing it adds is
 508  * correct refcounting dance.
 509  *
 510  * This should only be used by non-atomic legacy drivers.
 511  *
 512  * Returns:
 513  * Zero on success, negative errno on failure.
 514  */
 515 int drm_mode_set_config_internal(struct drm_mode_set *set)
 516 {
 517         WARN_ON(drm_drv_uses_atomic_modeset(set->crtc->dev));
 518
 519         return __drm_mode_set_config_internal(set, NULL);
 520 }
 521 EXPORT_SYMBOL(drm_mode_set_config_internal);
 522
 523 /**
 524  * drm_crtc_check_viewport - Checks that a framebuffer is big enough for the
 525  *     CRTC viewport
 526  * @crtc: CRTC that framebuffer will be displayed on
 527  * @x: x panning
 528  * @y: y panning
 529  * @mode: mode that framebuffer will be displayed under
 530  * @fb: framebuffer to check size of
 531  */
 532 int drm_crtc_check_viewport(const struct drm_crtc *crtc,
 533                             int x, int y,
 534                             const struct drm_display_mode *mode,
 535                             const struct drm_framebuffer *fb)
 536
 537 {
 538         int hdisplay, vdisplay;
 539
 540         drm_mode_get_hv_timing(mode, &hdisplay, &vdisplay);
 541
 542         if (crtc->state &&
 543             drm_rotation_90_or_270(crtc->primary->state->rotation))
 544                 swap(hdisplay, vdisplay);
 545
 546         return drm_framebuffer_check_src_coords(x << 16, y << 16,
 547                                                 hdisplay << 16, vdisplay << 16,
 548                                                 fb);
 549 }
 550 EXPORT_SYMBOL(drm_crtc_check_viewport);
 551
 552 /**
 553  * drm_mode_setcrtc - set CRTC configuration
 554  * @dev: drm device for the ioctl
 555  * @data: data pointer for the ioctl
 556  * @file_priv: drm file for the ioctl call
 557  *
 558  * Build a new CRTC configuration based on user request.
 559  *
 560  * Called by the user via ioctl.
 561  *
 562  * Returns:
 563  * Zero on success, negative errno on failure.
 564  */
 565 int drm_mode_setcrtc(struct drm_device *dev, void *data,
 566                      struct drm_file *file_priv)
 567 {
 568         struct drm_mode_config *config = &dev->mode_config;
 569         struct drm_mode_crtc *crtc_req = data;
 570         struct drm_crtc *crtc;
 571         struct drm_plane *plane;
 572         struct drm_connector **connector_set = NULL, *connector;
 573         struct drm_framebuffer *fb = NULL;
 574         struct drm_display_mode *mode = NULL;
 575         struct drm_mode_set set;
 576         uint32_t __user *set_connectors_ptr;
 577         struct drm_modeset_acquire_ctx ctx;
 578         int ret;
 579         int i;
 580
 581         if (!drm_core_check_feature(dev, DRIVER_MODESET))
 582                 return -EINVAL;
 583
 584         /*
 585          * Universal plane src offsets are only 16.16, prevent havoc for
 586          * drivers using universal plane code internally.
 587          */
 588         if (crtc_req->x & 0xffff0000 || crtc_req->y & 0xffff0000)
 589                 return -ERANGE;
 590
 591         crtc = drm_crtc_find(dev, file_priv, crtc_req->crtc_id);
 592         if (!crtc) {
 593                 DRM_DEBUG_KMS("Unknown CRTC ID %d\n", crtc_req->crtc_id);
 594                 return -ENOENT;
 595         }
 596         DRM_DEBUG_KMS("[CRTC:%d:%s]\n", crtc->base.id, crtc->name);
 597
 598         plane = crtc->primary;
 599
 600         mutex_lock(&crtc->dev->mode_config.mutex);
 601         drm_modeset_acquire_init(&ctx, DRM_MODESET_ACQUIRE_INTERRUPTIBLE);
 602 retry:
 603         ret = drm_modeset_lock_all_ctx(crtc->dev, &ctx);
 604         if (ret)
 605                 goto out;
 606
 607         if (crtc_req->mode_valid) {
 608                 /* If we have a mode we need a framebuffer. */
 609                 /* If we pass -1, set the mode with the currently bound fb */
 610                 if (crtc_req->fb_id == -1) {
 611                         struct drm_framebuffer *old_fb;
 612
 613                         if (plane->state)
 614                                 old_fb = plane->state->fb;
 615                         else
 616                                 old_fb = plane->fb;
 617
 618                         if (!old_fb) {
 619                                 DRM_DEBUG_KMS("CRTC doesn't have current FB\n");
 620                                 ret = -EINVAL;
 621                                 goto out;
 622                         }
 623
 624                         fb = old_fb;
 625                         /* Make refcounting symmetric with the lookup path. */
 626                         drm_framebuffer_get(fb);
 627                 } else {
 628                         fb = drm_framebuffer_lookup(dev, file_priv, crtc_req->fb_id);
 629                         if (!fb) {
 630                                 DRM_DEBUG_KMS("Unknown FB ID%d\n",
 631                                                 crtc_req->fb_id);
 632                                 ret = -ENOENT;
 633                                 goto out;
 634                         }
 635                 }
 636
 637                 mode = drm_mode_create(dev);
 638                 if (!mode) {
 639                         ret = -ENOMEM;
 640                         goto out;
 641                 }
 642                 if (!file_priv->aspect_ratio_allowed &&
 643                     (crtc_req->mode.flags & DRM_MODE_FLAG_PIC_AR_MASK) != DRM_MODE_FLAG_PIC_AR_NONE) {
 644                         DRM_DEBUG_KMS("Unexpected aspect-ratio flag bits\n");
 645                         ret = -EINVAL;
 646                         goto out;
 647                 }
 648
 649
 650                 ret = drm_mode_convert_umode(dev, mode, &crtc_req->mode);
 651                 if (ret) {
 652                         DRM_DEBUG_KMS("Invalid mode (ret=%d, status=%s)\n",
 653                                       ret, drm_get_mode_status_name(mode->status));
 654                         drm_mode_debug_printmodeline(mode);
 655                         goto out;
 656                 }
 657
 658                 /*
 659                  * Check whether the primary plane supports the fb pixel format.
 660                  * Drivers not implementing the universal planes API use a
 661                  * default formats list provided by the DRM core which doesn't
 662                  * match real hardware capabilities. Skip the check in that
 663                  * case.
 664                  */
 665                 if (!plane->format_default) {
 666                         ret = drm_plane_check_pixel_format(plane,
 667                                                            fb->format->format,
 668                                                            fb->modifier);
 669                         if (ret) {
 670                                 struct drm_format_name_buf format_name;
 671                                 DRM_DEBUG_KMS("Invalid pixel format %s, modifier 0x%llx\n",
 672                                               drm_get_format_name(fb->format->format,
 673                                                                   &format_name),
 674                                               fb->modifier);
 675                                 goto out;
 676                         }
 677                 }
 678
 679                 ret = drm_crtc_check_viewport(crtc, crtc_req->x, crtc_req->y,
 680                                               mode, fb);
 681                 if (ret)
 682                         goto out;
 683
 684         }
 685
 686         if (crtc_req->count_connectors == 0 && mode) {
 687                 DRM_DEBUG_KMS("Count connectors is 0 but mode set\n");
 688                 ret = -EINVAL;
 689                 goto out;
 690         }
 691
 692         if (crtc_req->count_connectors > 0 && (!mode || !fb)) {
 693                 DRM_DEBUG_KMS("Count connectors is %d but no mode or fb set\n",
 694                           crtc_req->count_connectors);
 695                 ret = -EINVAL;
 696                 goto out;
 697         }
 698
 699         if (crtc_req->count_connectors > 0) {
 700                 u32 out_id;
 701
 702                 /* Avoid unbounded kernel memory allocation */
 703                 if (crtc_req->count_connectors > config->num_connector) {
 704                         ret = -EINVAL;
 705                         goto out;
 706                 }
 707
 708                 connector_set = kmalloc_array(crtc_req->count_connectors,
 709                                               sizeof(struct drm_connector *),
 710                                               GFP_KERNEL);
 711                 if (!connector_set) {
 712                         ret = -ENOMEM;
 713                         goto out;
 714                 }
 715
 716                 for (i = 0; i < crtc_req->count_connectors; i++) {
 717                         connector_set[i] = NULL;
 718                         set_connectors_ptr = (uint32_t __user *)(unsigned long)crtc_req->set_connectors_ptr;
 719                         if (get_user(out_id, &set_connectors_ptr[i])) {
 720                                 ret = -EFAULT;
 721                                 goto out;
 722                         }
 723
 724                         connector = drm_connector_lookup(dev, file_priv, out_id);
 725                         if (!connector) {
 726                                 DRM_DEBUG_KMS("Connector id %d unknown\n",
 727                                                 out_id);
 728                                 ret = -ENOENT;
 729                                 goto out;
 730                         }
 731                         DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n",
 732                                         connector->base.id,
 733                                         connector->name);
 734
 735                         connector_set[i] = connector;
 736                 }
 737         }
 738
 739         set.crtc = crtc;
 740         set.x = crtc_req->x;
 741         set.y = crtc_req->y;
 742         set.mode = mode;
 743         set.connectors = connector_set;
 744         set.num_connectors = crtc_req->count_connectors;
 745         set.fb = fb;
 746         ret = __drm_mode_set_config_internal(&set, &ctx);
 747
 748 out:
 749         if (fb)
 750                 drm_framebuffer_put(fb);
 751
 752         if (connector_set) {
 753                 for (i = 0; i < crtc_req->count_connectors; i++) {
 754                         if (connector_set[i])
 755                                 drm_connector_put(connector_set[i]);
 756                 }
 757         }
 758         kfree(connector_set);
 759         drm_mode_destroy(dev, mode);
 760         if (ret == -EDEADLK) {
 761                 ret = drm_modeset_backoff(&ctx);
 762                 if (!ret)
 763                         goto retry;
 764         }
 765         drm_modeset_drop_locks(&ctx);
 766         drm_modeset_acquire_fini(&ctx);
 767         mutex_unlock(&crtc->dev->mode_config.mutex);
 768
 769         return ret;
 770 }
 771
 772 int drm_mode_crtc_set_obj_prop(struct drm_mode_object *obj,
 773                                struct drm_property *property,
 774                                uint64_t value)
 775 {
 776         int ret = -EINVAL;
 777         struct drm_crtc *crtc = obj_to_crtc(obj);
 778
 779         if (crtc->funcs->set_property)
 780                 ret = crtc->funcs->set_property(crtc, property, value);
 781         if (!ret)
 782                 drm_object_property_set_value(obj, property, value);
 783
 784         return ret;
 785 }