drivers/gpu/drm/i915/gem/i915_gem_object.h

   1 /*
   2  * SPDX-License-Identifier: MIT
   3  *
   4  * Copyright © 2016 Intel Corporation
   5  */
   6
   7 #ifndef __I915_GEM_OBJECT_H__
   8 #define __I915_GEM_OBJECT_H__
   9
  10 #include <drm/drm_gem.h>
  11 #include <drm/drm_file.h>
  12 #include <drm/drm_device.h>
  13
  14 #include "display/intel_frontbuffer.h"
  15 #include "i915_gem_object_types.h"
  16 #include "i915_gem_gtt.h"
  17 #include "i915_vma_types.h"
  18
  19 /*
  20  * XXX: There is a prevalence of the assumption that we fit the
  21  * object's page count inside a 32bit _signed_ variable. Let's document
  22  * this and catch if we ever need to fix it. In the meantime, if you do
  23  * spot such a local variable, please consider fixing!
  24  *
  25  * Aside from our own locals (for which we have no excuse!):
  26  * - sg_table embeds unsigned int for num_pages
  27  * - get_user_pages*() mixed ints with longs
  28  */
  29 #define GEM_CHECK_SIZE_OVERFLOW(sz) \
  30         GEM_WARN_ON((sz) >> PAGE_SHIFT > INT_MAX)
  31
  32 static inline bool i915_gem_object_size_2big(u64 size)
  33 {
  34         struct drm_i915_gem_object *obj;
  35
  36         if (GEM_CHECK_SIZE_OVERFLOW(size))
  37                 return true;
  38
  39         if (overflows_type(size, obj->base.size))
  40                 return true;
  41
  42         return false;
  43 }
  44
  45 void i915_gem_init__objects(struct drm_i915_private *i915);
  46
  47 struct drm_i915_gem_object *i915_gem_object_alloc(void);
  48 void i915_gem_object_free(struct drm_i915_gem_object *obj);
  49
  50 void i915_gem_object_init(struct drm_i915_gem_object *obj,
  51                           const struct drm_i915_gem_object_ops *ops,
  52                           struct lock_class_key *key,
  53                           unsigned alloc_flags);
  54 struct drm_i915_gem_object *
  55 i915_gem_object_create_shmem(struct drm_i915_private *i915,
  56                              resource_size_t size);
  57 struct drm_i915_gem_object *
  58 i915_gem_object_create_shmem_from_data(struct drm_i915_private *i915,
  59                                        const void *data, resource_size_t size);
  60
  61 extern const struct drm_i915_gem_object_ops i915_gem_shmem_ops;
  62
  63 void __i915_gem_object_release_shmem(struct drm_i915_gem_object *obj,
  64                                      struct sg_table *pages,
  65                                      bool needs_clflush);
  66
  67 int i915_gem_object_pwrite_phys(struct drm_i915_gem_object *obj,
  68                                 const struct drm_i915_gem_pwrite *args);
  69 int i915_gem_object_pread_phys(struct drm_i915_gem_object *obj,
  70                                const struct drm_i915_gem_pread *args);
  71
  72 int i915_gem_object_attach_phys(struct drm_i915_gem_object *obj, int align);
  73 void i915_gem_object_put_pages_shmem(struct drm_i915_gem_object *obj,
  74                                      struct sg_table *pages);
  75 void i915_gem_object_put_pages_phys(struct drm_i915_gem_object *obj,
  76                                     struct sg_table *pages);
  77
  78 void i915_gem_flush_free_objects(struct drm_i915_private *i915);
  79
  80 struct sg_table *
  81 __i915_gem_object_unset_pages(struct drm_i915_gem_object *obj);
  82 void i915_gem_object_truncate(struct drm_i915_gem_object *obj);
  83
  84 /**
  85  * i915_gem_object_lookup_rcu - look up a temporary GEM object from its handle
  86  * @filp: DRM file private date
  87  * @handle: userspace handle
  88  *
  89  * Returns:
  90  *
  91  * A pointer to the object named by the handle if such exists on @filp, NULL
  92  * otherwise. This object is only valid whilst under the RCU read lock, and
  93  * note carefully the object may be in the process of being destroyed.
  94  */
  95 static inline struct drm_i915_gem_object *
  96 i915_gem_object_lookup_rcu(struct drm_file *file, u32 handle)
  97 {
  98 #ifdef CONFIG_LOCKDEP
  99         WARN_ON(debug_locks && !lock_is_held(&rcu_lock_map));
 100 #endif
 101         return idr_find(&file->object_idr, handle);
 102 }
 103
 104 static inline struct drm_i915_gem_object *
 105 i915_gem_object_get_rcu(struct drm_i915_gem_object *obj)
 106 {
 107         if (obj && !kref_get_unless_zero(&obj->base.refcount))
 108                 obj = NULL;
 109
 110         return obj;
 111 }
 112
 113 static inline struct drm_i915_gem_object *
 114 i915_gem_object_lookup(struct drm_file *file, u32 handle)
 115 {
 116         struct drm_i915_gem_object *obj;
 117
 118         rcu_read_lock();
 119         obj = i915_gem_object_lookup_rcu(file, handle);
 120         obj = i915_gem_object_get_rcu(obj);
 121         rcu_read_unlock();
 122
 123         return obj;
 124 }
 125
 126 __deprecated
 127 struct drm_gem_object *
 128 drm_gem_object_lookup(struct drm_file *file, u32 handle);
 129
 130 __attribute__((nonnull))
 131 static inline struct drm_i915_gem_object *
 132 i915_gem_object_get(struct drm_i915_gem_object *obj)
 133 {
 134         drm_gem_object_get(&obj->base);
 135         return obj;
 136 }
 137
 138 __attribute__((nonnull))
 139 static inline void
 140 i915_gem_object_put(struct drm_i915_gem_object *obj)
 141 {
 142         __drm_gem_object_put(&obj->base);
 143 }
 144
 145 #define assert_object_held(obj) dma_resv_assert_held((obj)->base.resv)
 146
 147 /*
 148  * If more than one potential simultaneous locker, assert held.
 149  */
 150 static inline void assert_object_held_shared(struct drm_i915_gem_object *obj)
 151 {
 152         /*
 153          * Note mm list lookup is protected by
 154          * kref_get_unless_zero().
 155          */
 156         if (IS_ENABLED(CONFIG_LOCKDEP) &&
 157             kref_read(&obj->base.refcount) > 0)
 158                 assert_object_held(obj);
 159 }
 160
 161 static inline int __i915_gem_object_lock(struct drm_i915_gem_object *obj,
 162                                          struct i915_gem_ww_ctx *ww,
 163                                          bool intr)
 164 {
 165         int ret;
 166
 167         if (intr)
 168                 ret = dma_resv_lock_interruptible(obj->base.resv, ww ? &ww->ctx : NULL);
 169         else
 170                 ret = dma_resv_lock(obj->base.resv, ww ? &ww->ctx : NULL);
 171
 172         if (!ret && ww)
 173                 list_add_tail(&obj->obj_link, &ww->obj_list);
 174         if (ret == -EALREADY)
 175                 ret = 0;
 176
 177         if (ret == -EDEADLK)
 178                 ww->contended = obj;
 179
 180         return ret;
 181 }
 182
 183 static inline int i915_gem_object_lock(struct drm_i915_gem_object *obj,
 184                                        struct i915_gem_ww_ctx *ww)
 185 {
 186         return __i915_gem_object_lock(obj, ww, ww && ww->intr);
 187 }
 188
 189 static inline int i915_gem_object_lock_interruptible(struct drm_i915_gem_object *obj,
 190                                                      struct i915_gem_ww_ctx *ww)
 191 {
 192         WARN_ON(ww && !ww->intr);
 193         return __i915_gem_object_lock(obj, ww, true);
 194 }
 195
 196 static inline bool i915_gem_object_trylock(struct drm_i915_gem_object *obj)
 197 {
 198         return dma_resv_trylock(obj->base.resv);
 199 }
 200
 201 static inline void i915_gem_object_unlock(struct drm_i915_gem_object *obj)
 202 {
 203         dma_resv_unlock(obj->base.resv);
 204 }
 205
 206 static inline void
 207 i915_gem_object_set_readonly(struct drm_i915_gem_object *obj)
 208 {
 209         obj->flags |= I915_BO_READONLY;
 210 }
 211
 212 static inline bool
 213 i915_gem_object_is_readonly(const struct drm_i915_gem_object *obj)
 214 {
 215         return obj->flags & I915_BO_READONLY;
 216 }
 217
 218 static inline bool
 219 i915_gem_object_is_contiguous(const struct drm_i915_gem_object *obj)
 220 {
 221         return obj->flags & I915_BO_ALLOC_CONTIGUOUS;
 222 }
 223
 224 static inline bool
 225 i915_gem_object_is_volatile(const struct drm_i915_gem_object *obj)
 226 {
 227         return obj->flags & I915_BO_ALLOC_VOLATILE;
 228 }
 229
 230 static inline void
 231 i915_gem_object_set_volatile(struct drm_i915_gem_object *obj)
 232 {
 233         obj->flags |= I915_BO_ALLOC_VOLATILE;
 234 }
 235
 236 static inline bool
 237 i915_gem_object_has_tiling_quirk(struct drm_i915_gem_object *obj)
 238 {
 239         return test_bit(I915_TILING_QUIRK_BIT, &obj->flags);
 240 }
 241
 242 static inline void
 243 i915_gem_object_set_tiling_quirk(struct drm_i915_gem_object *obj)
 244 {
 245         set_bit(I915_TILING_QUIRK_BIT, &obj->flags);
 246 }
 247
 248 static inline void
 249 i915_gem_object_clear_tiling_quirk(struct drm_i915_gem_object *obj)
 250 {
 251         clear_bit(I915_TILING_QUIRK_BIT, &obj->flags);
 252 }
 253
 254 static inline bool
 255 i915_gem_object_type_has(const struct drm_i915_gem_object *obj,
 256                          unsigned long flags)
 257 {
 258         return obj->ops->flags & flags;
 259 }
 260
 261 static inline bool
 262 i915_gem_object_has_struct_page(const struct drm_i915_gem_object *obj)
 263 {
 264         return obj->flags & I915_BO_ALLOC_STRUCT_PAGE;
 265 }
 266
 267 static inline bool
 268 i915_gem_object_has_iomem(const struct drm_i915_gem_object *obj)
 269 {
 270         return i915_gem_object_type_has(obj, I915_GEM_OBJECT_HAS_IOMEM);
 271 }
 272
 273 static inline bool
 274 i915_gem_object_is_shrinkable(const struct drm_i915_gem_object *obj)
 275 {
 276         return i915_gem_object_type_has(obj, I915_GEM_OBJECT_IS_SHRINKABLE);
 277 }
 278
 279 static inline bool
 280 i915_gem_object_is_proxy(const struct drm_i915_gem_object *obj)
 281 {
 282         return i915_gem_object_type_has(obj, I915_GEM_OBJECT_IS_PROXY);
 283 }
 284
 285 static inline bool
 286 i915_gem_object_never_mmap(const struct drm_i915_gem_object *obj)
 287 {
 288         return i915_gem_object_type_has(obj, I915_GEM_OBJECT_NO_MMAP);
 289 }
 290
 291 static inline bool
 292 i915_gem_object_is_framebuffer(const struct drm_i915_gem_object *obj)
 293 {
 294         return READ_ONCE(obj->frontbuffer);
 295 }
 296
 297 static inline unsigned int
 298 i915_gem_object_get_tiling(const struct drm_i915_gem_object *obj)
 299 {
 300         return obj->tiling_and_stride & TILING_MASK;
 301 }
 302
 303 static inline bool
 304 i915_gem_object_is_tiled(const struct drm_i915_gem_object *obj)
 305 {
 306         return i915_gem_object_get_tiling(obj) != I915_TILING_NONE;
 307 }
 308
 309 static inline unsigned int
 310 i915_gem_object_get_stride(const struct drm_i915_gem_object *obj)
 311 {
 312         return obj->tiling_and_stride & STRIDE_MASK;
 313 }
 314
 315 static inline unsigned int
 316 i915_gem_tile_height(unsigned int tiling)
 317 {
 318         GEM_BUG_ON(!tiling);
 319         return tiling == I915_TILING_Y ? 32 : 8;
 320 }
 321
 322 static inline unsigned int
 323 i915_gem_object_get_tile_height(const struct drm_i915_gem_object *obj)
 324 {
 325         return i915_gem_tile_height(i915_gem_object_get_tiling(obj));
 326 }
 327
 328 static inline unsigned int
 329 i915_gem_object_get_tile_row_size(const struct drm_i915_gem_object *obj)
 330 {
 331         return (i915_gem_object_get_stride(obj) *
 332                 i915_gem_object_get_tile_height(obj));
 333 }
 334
 335 int i915_gem_object_set_tiling(struct drm_i915_gem_object *obj,
 336                                unsigned int tiling, unsigned int stride);
 337
 338 struct scatterlist *
 339 __i915_gem_object_get_sg(struct drm_i915_gem_object *obj,
 340                          struct i915_gem_object_page_iter *iter,
 341                          unsigned int n,
 342                          unsigned int *offset, bool allow_alloc);
 343
 344 static inline struct scatterlist *
 345 i915_gem_object_get_sg(struct drm_i915_gem_object *obj,
 346                        unsigned int n,
 347                        unsigned int *offset, bool allow_alloc)
 348 {
 349         return __i915_gem_object_get_sg(obj, &obj->mm.get_page, n, offset, allow_alloc);
 350 }
 351
 352 static inline struct scatterlist *
 353 i915_gem_object_get_sg_dma(struct drm_i915_gem_object *obj,
 354                            unsigned int n,
 355                            unsigned int *offset, bool allow_alloc)
 356 {
 357         return __i915_gem_object_get_sg(obj, &obj->mm.get_dma_page, n, offset, allow_alloc);
 358 }
 359
 360 struct page *
 361 i915_gem_object_get_page(struct drm_i915_gem_object *obj,
 362                          unsigned int n);
 363
 364 struct page *
 365 i915_gem_object_get_dirty_page(struct drm_i915_gem_object *obj,
 366                                unsigned int n);
 367
 368 dma_addr_t
 369 i915_gem_object_get_dma_address_len(struct drm_i915_gem_object *obj,
 370                                     unsigned long n,
 371                                     unsigned int *len);
 372
 373 dma_addr_t
 374 i915_gem_object_get_dma_address(struct drm_i915_gem_object *obj,
 375                                 unsigned long n);
 376
 377 void __i915_gem_object_set_pages(struct drm_i915_gem_object *obj,
 378                                  struct sg_table *pages,
 379                                  unsigned int sg_page_sizes);
 380
 381 int ____i915_gem_object_get_pages(struct drm_i915_gem_object *obj);
 382 int __i915_gem_object_get_pages(struct drm_i915_gem_object *obj);
 383
 384 static inline int __must_check
 385 i915_gem_object_pin_pages(struct drm_i915_gem_object *obj)
 386 {
 387         assert_object_held(obj);
 388
 389         if (atomic_inc_not_zero(&obj->mm.pages_pin_count))
 390                 return 0;
 391
 392         return __i915_gem_object_get_pages(obj);
 393 }
 394
 395 int i915_gem_object_pin_pages_unlocked(struct drm_i915_gem_object *obj);
 396
 397 static inline bool
 398 i915_gem_object_has_pages(struct drm_i915_gem_object *obj)
 399 {
 400         return !IS_ERR_OR_NULL(READ_ONCE(obj->mm.pages));
 401 }
 402
 403 static inline void
 404 __i915_gem_object_pin_pages(struct drm_i915_gem_object *obj)
 405 {
 406         GEM_BUG_ON(!i915_gem_object_has_pages(obj));
 407
 408         atomic_inc(&obj->mm.pages_pin_count);
 409 }
 410
 411 static inline bool
 412 i915_gem_object_has_pinned_pages(struct drm_i915_gem_object *obj)
 413 {
 414         return atomic_read(&obj->mm.pages_pin_count);
 415 }
 416
 417 static inline void
 418 __i915_gem_object_unpin_pages(struct drm_i915_gem_object *obj)
 419 {
 420         GEM_BUG_ON(!i915_gem_object_has_pages(obj));
 421         GEM_BUG_ON(!i915_gem_object_has_pinned_pages(obj));
 422
 423         atomic_dec(&obj->mm.pages_pin_count);
 424 }
 425
 426 static inline void
 427 i915_gem_object_unpin_pages(struct drm_i915_gem_object *obj)
 428 {
 429         __i915_gem_object_unpin_pages(obj);
 430 }
 431
 432 int __i915_gem_object_put_pages(struct drm_i915_gem_object *obj);
 433 void i915_gem_object_truncate(struct drm_i915_gem_object *obj);
 434 void i915_gem_object_writeback(struct drm_i915_gem_object *obj);
 435
 436 /**
 437  * i915_gem_object_pin_map - return a contiguous mapping of the entire object
 438  * @obj: the object to map into kernel address space
 439  * @type: the type of mapping, used to select pgprot_t
 440  *
 441  * Calls i915_gem_object_pin_pages() to prevent reaping of the object's
 442  * pages and then returns a contiguous mapping of the backing storage into
 443  * the kernel address space. Based on the @type of mapping, the PTE will be
 444  * set to either WriteBack or WriteCombine (via pgprot_t).
 445  *
 446  * The caller is responsible for calling i915_gem_object_unpin_map() when the
 447  * mapping is no longer required.
 448  *
 449  * Returns the pointer through which to access the mapped object, or an
 450  * ERR_PTR() on error.
 451  */
 452 void *__must_check i915_gem_object_pin_map(struct drm_i915_gem_object *obj,
 453                                            enum i915_map_type type);
 454
 455 void *__must_check i915_gem_object_pin_map_unlocked(struct drm_i915_gem_object *obj,
 456                                                     enum i915_map_type type);
 457
 458 void __i915_gem_object_flush_map(struct drm_i915_gem_object *obj,
 459                                  unsigned long offset,
 460                                  unsigned long size);
 461 static inline void i915_gem_object_flush_map(struct drm_i915_gem_object *obj)
 462 {
 463         __i915_gem_object_flush_map(obj, 0, obj->base.size);
 464 }
 465
 466 /**
 467  * i915_gem_object_unpin_map - releases an earlier mapping
 468  * @obj: the object to unmap
 469  *
 470  * After pinning the object and mapping its pages, once you are finished
 471  * with your access, call i915_gem_object_unpin_map() to release the pin
 472  * upon the mapping. Once the pin count reaches zero, that mapping may be
 473  * removed.
 474  */
 475 static inline void i915_gem_object_unpin_map(struct drm_i915_gem_object *obj)
 476 {
 477         i915_gem_object_unpin_pages(obj);
 478 }
 479
 480 void __i915_gem_object_release_map(struct drm_i915_gem_object *obj);
 481
 482 int i915_gem_object_prepare_read(struct drm_i915_gem_object *obj,
 483                                  unsigned int *needs_clflush);
 484 int i915_gem_object_prepare_write(struct drm_i915_gem_object *obj,
 485                                   unsigned int *needs_clflush);
 486 #define CLFLUSH_BEFORE  BIT(0)
 487 #define CLFLUSH_AFTER   BIT(1)
 488 #define CLFLUSH_FLAGS   (CLFLUSH_BEFORE | CLFLUSH_AFTER)
 489
 490 static inline void
 491 i915_gem_object_finish_access(struct drm_i915_gem_object *obj)
 492 {
 493         i915_gem_object_unpin_pages(obj);
 494 }
 495
 496 static inline struct intel_engine_cs *
 497 i915_gem_object_last_write_engine(struct drm_i915_gem_object *obj)
 498 {
 499         struct intel_engine_cs *engine = NULL;
 500         struct dma_fence *fence;
 501
 502         rcu_read_lock();
 503         fence = dma_resv_get_excl_rcu(obj->base.resv);
 504         rcu_read_unlock();
 505
 506         if (fence && dma_fence_is_i915(fence) && !dma_fence_is_signaled(fence))
 507                 engine = to_request(fence)->engine;
 508         dma_fence_put(fence);
 509
 510         return engine;
 511 }
 512
 513 void i915_gem_object_set_cache_coherency(struct drm_i915_gem_object *obj,
 514                                          unsigned int cache_level);
 515 void i915_gem_object_flush_if_display(struct drm_i915_gem_object *obj);
 516 void i915_gem_object_flush_if_display_locked(struct drm_i915_gem_object *obj);
 517
 518 int __must_check
 519 i915_gem_object_set_to_wc_domain(struct drm_i915_gem_object *obj, bool write);
 520 int __must_check
 521 i915_gem_object_set_to_gtt_domain(struct drm_i915_gem_object *obj, bool write);
 522 int __must_check
 523 i915_gem_object_set_to_cpu_domain(struct drm_i915_gem_object *obj, bool write);
 524 struct i915_vma * __must_check
 525 i915_gem_object_pin_to_display_plane(struct drm_i915_gem_object *obj,
 526                                      struct i915_gem_ww_ctx *ww,
 527                                      u32 alignment,
 528                                      const struct i915_ggtt_view *view,
 529                                      unsigned int flags);
 530
 531 void i915_gem_object_make_unshrinkable(struct drm_i915_gem_object *obj);
 532 void i915_gem_object_make_shrinkable(struct drm_i915_gem_object *obj);
 533 void i915_gem_object_make_purgeable(struct drm_i915_gem_object *obj);
 534
 535 static inline bool cpu_write_needs_clflush(struct drm_i915_gem_object *obj)
 536 {
 537         if (obj->cache_dirty)
 538                 return false;
 539
 540         if (!(obj->cache_coherent & I915_BO_CACHE_COHERENT_FOR_WRITE))
 541                 return true;
 542
 543         /* Currently in use by HW (display engine)? Keep flushed. */
 544         return i915_gem_object_is_framebuffer(obj);
 545 }
 546
 547 static inline void __start_cpu_write(struct drm_i915_gem_object *obj)
 548 {
 549         obj->read_domains = I915_GEM_DOMAIN_CPU;
 550         obj->write_domain = I915_GEM_DOMAIN_CPU;
 551         if (cpu_write_needs_clflush(obj))
 552                 obj->cache_dirty = true;
 553 }
 554
 555 void i915_gem_fence_wait_priority(struct dma_fence *fence,
 556                                   const struct i915_sched_attr *attr);
 557
 558 int i915_gem_object_wait(struct drm_i915_gem_object *obj,
 559                          unsigned int flags,
 560                          long timeout);
 561 int i915_gem_object_wait_priority(struct drm_i915_gem_object *obj,
 562                                   unsigned int flags,
 563                                   const struct i915_sched_attr *attr);
 564
 565 void __i915_gem_object_flush_frontbuffer(struct drm_i915_gem_object *obj,
 566                                          enum fb_op_origin origin);
 567 void __i915_gem_object_invalidate_frontbuffer(struct drm_i915_gem_object *obj,
 568                                               enum fb_op_origin origin);
 569
 570 static inline void
 571 i915_gem_object_flush_frontbuffer(struct drm_i915_gem_object *obj,
 572                                   enum fb_op_origin origin)
 573 {
 574         if (unlikely(rcu_access_pointer(obj->frontbuffer)))
 575                 __i915_gem_object_flush_frontbuffer(obj, origin);
 576 }
 577
 578 static inline void
 579 i915_gem_object_invalidate_frontbuffer(struct drm_i915_gem_object *obj,
 580                                        enum fb_op_origin origin)
 581 {
 582         if (unlikely(rcu_access_pointer(obj->frontbuffer)))
 583                 __i915_gem_object_invalidate_frontbuffer(obj, origin);
 584 }
 585
 586 int i915_gem_object_read_from_page(struct drm_i915_gem_object *obj, u64 offset, void *dst, int size);
 587
 588 bool i915_gem_object_is_shmem(const struct drm_i915_gem_object *obj);
 589
 590 #ifdef CONFIG_MMU_NOTIFIER
 591 static inline bool
 592 i915_gem_object_is_userptr(struct drm_i915_gem_object *obj)
 593 {
 594         return obj->userptr.notifier.mm;
 595 }
 596
 597 int i915_gem_object_userptr_submit_init(struct drm_i915_gem_object *obj);
 598 int i915_gem_object_userptr_submit_done(struct drm_i915_gem_object *obj);
 599 void i915_gem_object_userptr_submit_fini(struct drm_i915_gem_object *obj);
 600 int i915_gem_object_userptr_validate(struct drm_i915_gem_object *obj);
 601 #else
 602 static inline bool i915_gem_object_is_userptr(struct drm_i915_gem_object *obj) { return false; }
 603
 604 static inline int i915_gem_object_userptr_submit_init(struct drm_i915_gem_object *obj) { GEM_BUG_ON(1); return -ENODEV; }
 605 static inline int i915_gem_object_userptr_submit_done(struct drm_i915_gem_object *obj) { GEM_BUG_ON(1); return -ENODEV; }
 606 static inline void i915_gem_object_userptr_submit_fini(struct drm_i915_gem_object *obj) { GEM_BUG_ON(1); }
 607 static inline int i915_gem_object_userptr_validate(struct drm_i915_gem_object *obj) { GEM_BUG_ON(1); return -ENODEV; }
 608
 609 #endif
 610
 611 #endif