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 void i915_gem_init__objects(struct drm_i915_private *i915);
  20
  21 struct drm_i915_gem_object *i915_gem_object_alloc(void);
  22 void i915_gem_object_free(struct drm_i915_gem_object *obj);
  23
  24 void i915_gem_object_init(struct drm_i915_gem_object *obj,
  25                           const struct drm_i915_gem_object_ops *ops,
  26                           struct lock_class_key *key);
  27 struct drm_i915_gem_object *
  28 i915_gem_object_create_shmem(struct drm_i915_private *i915,
  29                              resource_size_t size);
  30 struct drm_i915_gem_object *
  31 i915_gem_object_create_shmem_from_data(struct drm_i915_private *i915,
  32                                        const void *data, resource_size_t size);
  33
  34 extern const struct drm_i915_gem_object_ops i915_gem_shmem_ops;
  35 void __i915_gem_object_release_shmem(struct drm_i915_gem_object *obj,
  36                                      struct sg_table *pages,
  37                                      bool needs_clflush);
  38
  39 int i915_gem_object_attach_phys(struct drm_i915_gem_object *obj, int align);
  40
  41 void i915_gem_flush_free_objects(struct drm_i915_private *i915);
  42
  43 struct sg_table *
  44 __i915_gem_object_unset_pages(struct drm_i915_gem_object *obj);
  45 void i915_gem_object_truncate(struct drm_i915_gem_object *obj);
  46
  47 /**
  48  * i915_gem_object_lookup_rcu - look up a temporary GEM object from its handle
  49  * @filp: DRM file private date
  50  * @handle: userspace handle
  51  *
  52  * Returns:
  53  *
  54  * A pointer to the object named by the handle if such exists on @filp, NULL
  55  * otherwise. This object is only valid whilst under the RCU read lock, and
  56  * note carefully the object may be in the process of being destroyed.
  57  */
  58 static inline struct drm_i915_gem_object *
  59 i915_gem_object_lookup_rcu(struct drm_file *file, u32 handle)
  60 {
  61 #ifdef CONFIG_LOCKDEP
  62         WARN_ON(debug_locks && !lock_is_held(&rcu_lock_map));
  63 #endif
  64         return idr_find(&file->object_idr, handle);
  65 }
  66
  67 static inline struct drm_i915_gem_object *
  68 i915_gem_object_get_rcu(struct drm_i915_gem_object *obj)
  69 {
  70         if (obj && !kref_get_unless_zero(&obj->base.refcount))
  71                 obj = NULL;
  72
  73         return obj;
  74 }
  75
  76 static inline struct drm_i915_gem_object *
  77 i915_gem_object_lookup(struct drm_file *file, u32 handle)
  78 {
  79         struct drm_i915_gem_object *obj;
  80
  81         rcu_read_lock();
  82         obj = i915_gem_object_lookup_rcu(file, handle);
  83         obj = i915_gem_object_get_rcu(obj);
  84         rcu_read_unlock();
  85
  86         return obj;
  87 }
  88
  89 __deprecated
  90 struct drm_gem_object *
  91 drm_gem_object_lookup(struct drm_file *file, u32 handle);
  92
  93 __attribute__((nonnull))
  94 static inline struct drm_i915_gem_object *
  95 i915_gem_object_get(struct drm_i915_gem_object *obj)
  96 {
  97         drm_gem_object_get(&obj->base);
  98         return obj;
  99 }
 100
 101 __attribute__((nonnull))
 102 static inline void
 103 i915_gem_object_put(struct drm_i915_gem_object *obj)
 104 {
 105         __drm_gem_object_put(&obj->base);
 106 }
 107
 108 #define assert_object_held(obj) dma_resv_assert_held((obj)->base.resv)
 109
 110 static inline int __i915_gem_object_lock(struct drm_i915_gem_object *obj,
 111                                          struct i915_gem_ww_ctx *ww,
 112                                          bool intr)
 113 {
 114         int ret;
 115
 116         if (intr)
 117                 ret = dma_resv_lock_interruptible(obj->base.resv, ww ? &ww->ctx : NULL);
 118         else
 119                 ret = dma_resv_lock(obj->base.resv, ww ? &ww->ctx : NULL);
 120
 121         if (!ret && ww)
 122                 list_add_tail(&obj->obj_link, &ww->obj_list);
 123         if (ret == -EALREADY)
 124                 ret = 0;
 125
 126         if (ret == -EDEADLK)
 127                 ww->contended = obj;
 128
 129         return ret;
 130 }
 131
 132 static inline int i915_gem_object_lock(struct drm_i915_gem_object *obj,
 133                                        struct i915_gem_ww_ctx *ww)
 134 {
 135         return __i915_gem_object_lock(obj, ww, ww && ww->intr);
 136 }
 137
 138 static inline int i915_gem_object_lock_interruptible(struct drm_i915_gem_object *obj,
 139                                                      struct i915_gem_ww_ctx *ww)
 140 {
 141         WARN_ON(ww && !ww->intr);
 142         return __i915_gem_object_lock(obj, ww, true);
 143 }
 144
 145 static inline bool i915_gem_object_trylock(struct drm_i915_gem_object *obj)
 146 {
 147         return dma_resv_trylock(obj->base.resv);
 148 }
 149
 150 static inline void i915_gem_object_unlock(struct drm_i915_gem_object *obj)
 151 {
 152         dma_resv_unlock(obj->base.resv);
 153 }
 154
 155 struct dma_fence *
 156 i915_gem_object_lock_fence(struct drm_i915_gem_object *obj);
 157 void i915_gem_object_unlock_fence(struct drm_i915_gem_object *obj,
 158                                   struct dma_fence *fence);
 159
 160 static inline void
 161 i915_gem_object_set_readonly(struct drm_i915_gem_object *obj)
 162 {
 163         obj->flags |= I915_BO_READONLY;
 164 }
 165
 166 static inline bool
 167 i915_gem_object_is_readonly(const struct drm_i915_gem_object *obj)
 168 {
 169         return obj->flags & I915_BO_READONLY;
 170 }
 171
 172 static inline bool
 173 i915_gem_object_is_contiguous(const struct drm_i915_gem_object *obj)
 174 {
 175         return obj->flags & I915_BO_ALLOC_CONTIGUOUS;
 176 }
 177
 178 static inline bool
 179 i915_gem_object_is_volatile(const struct drm_i915_gem_object *obj)
 180 {
 181         return obj->flags & I915_BO_ALLOC_VOLATILE;
 182 }
 183
 184 static inline void
 185 i915_gem_object_set_volatile(struct drm_i915_gem_object *obj)
 186 {
 187         obj->flags |= I915_BO_ALLOC_VOLATILE;
 188 }
 189
 190 static inline bool
 191 i915_gem_object_type_has(const struct drm_i915_gem_object *obj,
 192                          unsigned long flags)
 193 {
 194         return obj->ops->flags & flags;
 195 }
 196
 197 static inline bool
 198 i915_gem_object_has_struct_page(const struct drm_i915_gem_object *obj)
 199 {
 200         return i915_gem_object_type_has(obj, I915_GEM_OBJECT_HAS_STRUCT_PAGE);
 201 }
 202
 203 static inline bool
 204 i915_gem_object_is_shrinkable(const struct drm_i915_gem_object *obj)
 205 {
 206         return i915_gem_object_type_has(obj, I915_GEM_OBJECT_IS_SHRINKABLE);
 207 }
 208
 209 static inline bool
 210 i915_gem_object_is_proxy(const struct drm_i915_gem_object *obj)
 211 {
 212         return i915_gem_object_type_has(obj, I915_GEM_OBJECT_IS_PROXY);
 213 }
 214
 215 static inline bool
 216 i915_gem_object_never_mmap(const struct drm_i915_gem_object *obj)
 217 {
 218         return i915_gem_object_type_has(obj, I915_GEM_OBJECT_NO_MMAP);
 219 }
 220
 221 static inline bool
 222 i915_gem_object_needs_async_cancel(const struct drm_i915_gem_object *obj)
 223 {
 224         return i915_gem_object_type_has(obj, I915_GEM_OBJECT_ASYNC_CANCEL);
 225 }
 226
 227 static inline bool
 228 i915_gem_object_is_framebuffer(const struct drm_i915_gem_object *obj)
 229 {
 230         return READ_ONCE(obj->frontbuffer);
 231 }
 232
 233 static inline unsigned int
 234 i915_gem_object_get_tiling(const struct drm_i915_gem_object *obj)
 235 {
 236         return obj->tiling_and_stride & TILING_MASK;
 237 }
 238
 239 static inline bool
 240 i915_gem_object_is_tiled(const struct drm_i915_gem_object *obj)
 241 {
 242         return i915_gem_object_get_tiling(obj) != I915_TILING_NONE;
 243 }
 244
 245 static inline unsigned int
 246 i915_gem_object_get_stride(const struct drm_i915_gem_object *obj)
 247 {
 248         return obj->tiling_and_stride & STRIDE_MASK;
 249 }
 250
 251 static inline unsigned int
 252 i915_gem_tile_height(unsigned int tiling)
 253 {
 254         GEM_BUG_ON(!tiling);
 255         return tiling == I915_TILING_Y ? 32 : 8;
 256 }
 257
 258 static inline unsigned int
 259 i915_gem_object_get_tile_height(const struct drm_i915_gem_object *obj)
 260 {
 261         return i915_gem_tile_height(i915_gem_object_get_tiling(obj));
 262 }
 263
 264 static inline unsigned int
 265 i915_gem_object_get_tile_row_size(const struct drm_i915_gem_object *obj)
 266 {
 267         return (i915_gem_object_get_stride(obj) *
 268                 i915_gem_object_get_tile_height(obj));
 269 }
 270
 271 int i915_gem_object_set_tiling(struct drm_i915_gem_object *obj,
 272                                unsigned int tiling, unsigned int stride);
 273
 274 struct scatterlist *
 275 __i915_gem_object_get_sg(struct drm_i915_gem_object *obj,
 276                          struct i915_gem_object_page_iter *iter,
 277                          unsigned int n,
 278                          unsigned int *offset);
 279
 280 static inline struct scatterlist *
 281 i915_gem_object_get_sg(struct drm_i915_gem_object *obj,
 282                        unsigned int n,
 283                        unsigned int *offset)
 284 {
 285         return __i915_gem_object_get_sg(obj, &obj->mm.get_page, n, offset);
 286 }
 287
 288 static inline struct scatterlist *
 289 i915_gem_object_get_sg_dma(struct drm_i915_gem_object *obj,
 290                            unsigned int n,
 291                            unsigned int *offset)
 292 {
 293         return __i915_gem_object_get_sg(obj, &obj->mm.get_dma_page, n, offset);
 294 }
 295
 296 struct page *
 297 i915_gem_object_get_page(struct drm_i915_gem_object *obj,
 298                          unsigned int n);
 299
 300 struct page *
 301 i915_gem_object_get_dirty_page(struct drm_i915_gem_object *obj,
 302                                unsigned int n);
 303
 304 dma_addr_t
 305 i915_gem_object_get_dma_address_len(struct drm_i915_gem_object *obj,
 306                                     unsigned long n,
 307                                     unsigned int *len);
 308
 309 dma_addr_t
 310 i915_gem_object_get_dma_address(struct drm_i915_gem_object *obj,
 311                                 unsigned long n);
 312
 313 void __i915_gem_object_set_pages(struct drm_i915_gem_object *obj,
 314                                  struct sg_table *pages,
 315                                  unsigned int sg_page_sizes);
 316
 317 int ____i915_gem_object_get_pages(struct drm_i915_gem_object *obj);
 318 int __i915_gem_object_get_pages(struct drm_i915_gem_object *obj);
 319
 320 enum i915_mm_subclass { /* lockdep subclass for obj->mm.lock/struct_mutex */
 321         I915_MM_NORMAL = 0,
 322         /*
 323          * Only used by struct_mutex, when called "recursively" from
 324          * direct-reclaim-esque. Safe because there is only every one
 325          * struct_mutex in the entire system.
 326          */
 327         I915_MM_SHRINKER = 1,
 328         /*
 329          * Used for obj->mm.lock when allocating pages. Safe because the object
 330          * isn't yet on any LRU, and therefore the shrinker can't deadlock on
 331          * it. As soon as the object has pages, obj->mm.lock nests within
 332          * fs_reclaim.
 333          */
 334         I915_MM_GET_PAGES = 1,
 335 };
 336
 337 static inline int __must_check
 338 i915_gem_object_pin_pages(struct drm_i915_gem_object *obj)
 339 {
 340         might_lock_nested(&obj->mm.lock, I915_MM_GET_PAGES);
 341
 342         if (atomic_inc_not_zero(&obj->mm.pages_pin_count))
 343                 return 0;
 344
 345         return __i915_gem_object_get_pages(obj);
 346 }
 347
 348 static inline bool
 349 i915_gem_object_has_pages(struct drm_i915_gem_object *obj)
 350 {
 351         return !IS_ERR_OR_NULL(READ_ONCE(obj->mm.pages));
 352 }
 353
 354 static inline void
 355 __i915_gem_object_pin_pages(struct drm_i915_gem_object *obj)
 356 {
 357         GEM_BUG_ON(!i915_gem_object_has_pages(obj));
 358
 359         atomic_inc(&obj->mm.pages_pin_count);
 360 }
 361
 362 static inline bool
 363 i915_gem_object_has_pinned_pages(struct drm_i915_gem_object *obj)
 364 {
 365         return atomic_read(&obj->mm.pages_pin_count);
 366 }
 367
 368 static inline void
 369 __i915_gem_object_unpin_pages(struct drm_i915_gem_object *obj)
 370 {
 371         GEM_BUG_ON(!i915_gem_object_has_pages(obj));
 372         GEM_BUG_ON(!i915_gem_object_has_pinned_pages(obj));
 373
 374         atomic_dec(&obj->mm.pages_pin_count);
 375 }
 376
 377 static inline void
 378 i915_gem_object_unpin_pages(struct drm_i915_gem_object *obj)
 379 {
 380         __i915_gem_object_unpin_pages(obj);
 381 }
 382
 383 int __i915_gem_object_put_pages(struct drm_i915_gem_object *obj);
 384 void i915_gem_object_truncate(struct drm_i915_gem_object *obj);
 385 void i915_gem_object_writeback(struct drm_i915_gem_object *obj);
 386
 387 enum i915_map_type {
 388         I915_MAP_WB = 0,
 389         I915_MAP_WC,
 390 #define I915_MAP_OVERRIDE BIT(31)
 391         I915_MAP_FORCE_WB = I915_MAP_WB | I915_MAP_OVERRIDE,
 392         I915_MAP_FORCE_WC = I915_MAP_WC | I915_MAP_OVERRIDE,
 393 };
 394
 395 /**
 396  * i915_gem_object_pin_map - return a contiguous mapping of the entire object
 397  * @obj: the object to map into kernel address space
 398  * @type: the type of mapping, used to select pgprot_t
 399  *
 400  * Calls i915_gem_object_pin_pages() to prevent reaping of the object's
 401  * pages and then returns a contiguous mapping of the backing storage into
 402  * the kernel address space. Based on the @type of mapping, the PTE will be
 403  * set to either WriteBack or WriteCombine (via pgprot_t).
 404  *
 405  * The caller is responsible for calling i915_gem_object_unpin_map() when the
 406  * mapping is no longer required.
 407  *
 408  * Returns the pointer through which to access the mapped object, or an
 409  * ERR_PTR() on error.
 410  */
 411 void *__must_check i915_gem_object_pin_map(struct drm_i915_gem_object *obj,
 412                                            enum i915_map_type type);
 413
 414 void __i915_gem_object_flush_map(struct drm_i915_gem_object *obj,
 415                                  unsigned long offset,
 416                                  unsigned long size);
 417 static inline void i915_gem_object_flush_map(struct drm_i915_gem_object *obj)
 418 {
 419         __i915_gem_object_flush_map(obj, 0, obj->base.size);
 420 }
 421
 422 /**
 423  * i915_gem_object_unpin_map - releases an earlier mapping
 424  * @obj: the object to unmap
 425  *
 426  * After pinning the object and mapping its pages, once you are finished
 427  * with your access, call i915_gem_object_unpin_map() to release the pin
 428  * upon the mapping. Once the pin count reaches zero, that mapping may be
 429  * removed.
 430  */
 431 static inline void i915_gem_object_unpin_map(struct drm_i915_gem_object *obj)
 432 {
 433         i915_gem_object_unpin_pages(obj);
 434 }
 435
 436 void __i915_gem_object_release_map(struct drm_i915_gem_object *obj);
 437
 438 void
 439 i915_gem_object_flush_write_domain(struct drm_i915_gem_object *obj,
 440                                    unsigned int flush_domains);
 441
 442 int i915_gem_object_prepare_read(struct drm_i915_gem_object *obj,
 443                                  unsigned int *needs_clflush);
 444 int i915_gem_object_prepare_write(struct drm_i915_gem_object *obj,
 445                                   unsigned int *needs_clflush);
 446 #define CLFLUSH_BEFORE  BIT(0)
 447 #define CLFLUSH_AFTER   BIT(1)
 448 #define CLFLUSH_FLAGS   (CLFLUSH_BEFORE | CLFLUSH_AFTER)
 449
 450 static inline void
 451 i915_gem_object_finish_access(struct drm_i915_gem_object *obj)
 452 {
 453         i915_gem_object_unpin_pages(obj);
 454 }
 455
 456 static inline struct intel_engine_cs *
 457 i915_gem_object_last_write_engine(struct drm_i915_gem_object *obj)
 458 {
 459         struct intel_engine_cs *engine = NULL;
 460         struct dma_fence *fence;
 461
 462         rcu_read_lock();
 463         fence = dma_resv_get_excl_rcu(obj->base.resv);
 464         rcu_read_unlock();
 465
 466         if (fence && dma_fence_is_i915(fence) && !dma_fence_is_signaled(fence))
 467                 engine = to_request(fence)->engine;
 468         dma_fence_put(fence);
 469
 470         return engine;
 471 }
 472
 473 void i915_gem_object_set_cache_coherency(struct drm_i915_gem_object *obj,
 474                                          unsigned int cache_level);
 475 void i915_gem_object_flush_if_display(struct drm_i915_gem_object *obj);
 476 void i915_gem_object_flush_if_display_locked(struct drm_i915_gem_object *obj);
 477
 478 int __must_check
 479 i915_gem_object_set_to_wc_domain(struct drm_i915_gem_object *obj, bool write);
 480 int __must_check
 481 i915_gem_object_set_to_gtt_domain(struct drm_i915_gem_object *obj, bool write);
 482 int __must_check
 483 i915_gem_object_set_to_cpu_domain(struct drm_i915_gem_object *obj, bool write);
 484 struct i915_vma * __must_check
 485 i915_gem_object_pin_to_display_plane(struct drm_i915_gem_object *obj,
 486                                      u32 alignment,
 487                                      const struct i915_ggtt_view *view,
 488                                      unsigned int flags);
 489 void i915_gem_object_unpin_from_display_plane(struct i915_vma *vma);
 490
 491 void i915_gem_object_make_unshrinkable(struct drm_i915_gem_object *obj);
 492 void i915_gem_object_make_shrinkable(struct drm_i915_gem_object *obj);
 493 void i915_gem_object_make_purgeable(struct drm_i915_gem_object *obj);
 494
 495 static inline bool cpu_write_needs_clflush(struct drm_i915_gem_object *obj)
 496 {
 497         if (obj->cache_dirty)
 498                 return false;
 499
 500         if (!(obj->cache_coherent & I915_BO_CACHE_COHERENT_FOR_WRITE))
 501                 return true;
 502
 503         /* Currently in use by HW (display engine)? Keep flushed. */
 504         return i915_gem_object_is_framebuffer(obj);
 505 }
 506
 507 static inline void __start_cpu_write(struct drm_i915_gem_object *obj)
 508 {
 509         obj->read_domains = I915_GEM_DOMAIN_CPU;
 510         obj->write_domain = I915_GEM_DOMAIN_CPU;
 511         if (cpu_write_needs_clflush(obj))
 512                 obj->cache_dirty = true;
 513 }
 514
 515 int i915_gem_object_wait(struct drm_i915_gem_object *obj,
 516                          unsigned int flags,
 517                          long timeout);
 518 int i915_gem_object_wait_priority(struct drm_i915_gem_object *obj,
 519                                   unsigned int flags,
 520                                   const struct i915_sched_attr *attr);
 521
 522 void __i915_gem_object_flush_frontbuffer(struct drm_i915_gem_object *obj,
 523                                          enum fb_op_origin origin);
 524 void __i915_gem_object_invalidate_frontbuffer(struct drm_i915_gem_object *obj,
 525                                               enum fb_op_origin origin);
 526
 527 static inline void
 528 i915_gem_object_flush_frontbuffer(struct drm_i915_gem_object *obj,
 529                                   enum fb_op_origin origin)
 530 {
 531         if (unlikely(rcu_access_pointer(obj->frontbuffer)))
 532                 __i915_gem_object_flush_frontbuffer(obj, origin);
 533 }
 534
 535 static inline void
 536 i915_gem_object_invalidate_frontbuffer(struct drm_i915_gem_object *obj,
 537                                        enum fb_op_origin origin)
 538 {
 539         if (unlikely(rcu_access_pointer(obj->frontbuffer)))
 540                 __i915_gem_object_invalidate_frontbuffer(obj, origin);
 541 }
 542
 543 #endif