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 <drm/i915_drm.h>
  15
  16 #include "display/intel_frontbuffer.h"
  17 #include "i915_gem_object_types.h"
  18 #include "i915_gem_gtt.h"
  19 #include "i915_vma_types.h"
  20
  21 void i915_gem_init__objects(struct drm_i915_private *i915);
  22
  23 struct drm_i915_gem_object *i915_gem_object_alloc(void);
  24 void i915_gem_object_free(struct drm_i915_gem_object *obj);
  25
  26 void i915_gem_object_init(struct drm_i915_gem_object *obj,
  27                           const struct drm_i915_gem_object_ops *ops,
  28                           struct lock_class_key *key);
  29 struct drm_i915_gem_object *
  30 i915_gem_object_create_shmem(struct drm_i915_private *i915,
  31                              resource_size_t size);
  32 struct drm_i915_gem_object *
  33 i915_gem_object_create_shmem_from_data(struct drm_i915_private *i915,
  34                                        const void *data, resource_size_t size);
  35
  36 extern const struct drm_i915_gem_object_ops i915_gem_shmem_ops;
  37 void __i915_gem_object_release_shmem(struct drm_i915_gem_object *obj,
  38                                      struct sg_table *pages,
  39                                      bool needs_clflush);
  40
  41 int i915_gem_object_attach_phys(struct drm_i915_gem_object *obj, int align);
  42
  43 void i915_gem_close_object(struct drm_gem_object *gem, struct drm_file *file);
  44 void i915_gem_free_object(struct drm_gem_object *obj);
  45
  46 void i915_gem_flush_free_objects(struct drm_i915_private *i915);
  47
  48 struct sg_table *
  49 __i915_gem_object_unset_pages(struct drm_i915_gem_object *obj);
  50 void i915_gem_object_truncate(struct drm_i915_gem_object *obj);
  51
  52 /**
  53  * i915_gem_object_lookup_rcu - look up a temporary GEM object from its handle
  54  * @filp: DRM file private date
  55  * @handle: userspace handle
  56  *
  57  * Returns:
  58  *
  59  * A pointer to the object named by the handle if such exists on @filp, NULL
  60  * otherwise. This object is only valid whilst under the RCU read lock, and
  61  * note carefully the object may be in the process of being destroyed.
  62  */
  63 static inline struct drm_i915_gem_object *
  64 i915_gem_object_lookup_rcu(struct drm_file *file, u32 handle)
  65 {
  66 #ifdef CONFIG_LOCKDEP
  67         WARN_ON(debug_locks && !lock_is_held(&rcu_lock_map));
  68 #endif
  69         return idr_find(&file->object_idr, handle);
  70 }
  71
  72 static inline struct drm_i915_gem_object *
  73 i915_gem_object_lookup(struct drm_file *file, u32 handle)
  74 {
  75         struct drm_i915_gem_object *obj;
  76
  77         rcu_read_lock();
  78         obj = i915_gem_object_lookup_rcu(file, handle);
  79         if (obj && !kref_get_unless_zero(&obj->base.refcount))
  80                 obj = NULL;
  81         rcu_read_unlock();
  82
  83         return obj;
  84 }
  85
  86 __deprecated
  87 struct drm_gem_object *
  88 drm_gem_object_lookup(struct drm_file *file, u32 handle);
  89
  90 __attribute__((nonnull))
  91 static inline struct drm_i915_gem_object *
  92 i915_gem_object_get(struct drm_i915_gem_object *obj)
  93 {
  94         drm_gem_object_get(&obj->base);
  95         return obj;
  96 }
  97
  98 __attribute__((nonnull))
  99 static inline void
 100 i915_gem_object_put(struct drm_i915_gem_object *obj)
 101 {
 102         __drm_gem_object_put(&obj->base);
 103 }
 104
 105 #define assert_object_held(obj) dma_resv_assert_held((obj)->base.resv)
 106
 107 static inline void i915_gem_object_lock(struct drm_i915_gem_object *obj)
 108 {
 109         dma_resv_lock(obj->base.resv, NULL);
 110 }
 111
 112 static inline bool i915_gem_object_trylock(struct drm_i915_gem_object *obj)
 113 {
 114         return dma_resv_trylock(obj->base.resv);
 115 }
 116
 117 static inline int
 118 i915_gem_object_lock_interruptible(struct drm_i915_gem_object *obj)
 119 {
 120         return dma_resv_lock_interruptible(obj->base.resv, NULL);
 121 }
 122
 123 static inline void i915_gem_object_unlock(struct drm_i915_gem_object *obj)
 124 {
 125         dma_resv_unlock(obj->base.resv);
 126 }
 127
 128 struct dma_fence *
 129 i915_gem_object_lock_fence(struct drm_i915_gem_object *obj);
 130 void i915_gem_object_unlock_fence(struct drm_i915_gem_object *obj,
 131                                   struct dma_fence *fence);
 132
 133 static inline void
 134 i915_gem_object_set_readonly(struct drm_i915_gem_object *obj)
 135 {
 136         obj->flags |= I915_BO_READONLY;
 137 }
 138
 139 static inline bool
 140 i915_gem_object_is_readonly(const struct drm_i915_gem_object *obj)
 141 {
 142         return obj->flags & I915_BO_READONLY;
 143 }
 144
 145 static inline bool
 146 i915_gem_object_is_contiguous(const struct drm_i915_gem_object *obj)
 147 {
 148         return obj->flags & I915_BO_ALLOC_CONTIGUOUS;
 149 }
 150
 151 static inline bool
 152 i915_gem_object_is_volatile(const struct drm_i915_gem_object *obj)
 153 {
 154         return obj->flags & I915_BO_ALLOC_VOLATILE;
 155 }
 156
 157 static inline void
 158 i915_gem_object_set_volatile(struct drm_i915_gem_object *obj)
 159 {
 160         obj->flags |= I915_BO_ALLOC_VOLATILE;
 161 }
 162
 163 static inline bool
 164 i915_gem_object_type_has(const struct drm_i915_gem_object *obj,
 165                          unsigned long flags)
 166 {
 167         return obj->ops->flags & flags;
 168 }
 169
 170 static inline bool
 171 i915_gem_object_has_struct_page(const struct drm_i915_gem_object *obj)
 172 {
 173         return i915_gem_object_type_has(obj, I915_GEM_OBJECT_HAS_STRUCT_PAGE);
 174 }
 175
 176 static inline bool
 177 i915_gem_object_is_shrinkable(const struct drm_i915_gem_object *obj)
 178 {
 179         return i915_gem_object_type_has(obj, I915_GEM_OBJECT_IS_SHRINKABLE);
 180 }
 181
 182 static inline bool
 183 i915_gem_object_is_proxy(const struct drm_i915_gem_object *obj)
 184 {
 185         return i915_gem_object_type_has(obj, I915_GEM_OBJECT_IS_PROXY);
 186 }
 187
 188 static inline bool
 189 i915_gem_object_never_bind_ggtt(const struct drm_i915_gem_object *obj)
 190 {
 191         return i915_gem_object_type_has(obj, I915_GEM_OBJECT_NO_GGTT);
 192 }
 193
 194 static inline bool
 195 i915_gem_object_needs_async_cancel(const struct drm_i915_gem_object *obj)
 196 {
 197         return i915_gem_object_type_has(obj, I915_GEM_OBJECT_ASYNC_CANCEL);
 198 }
 199
 200 static inline bool
 201 i915_gem_object_is_framebuffer(const struct drm_i915_gem_object *obj)
 202 {
 203         return READ_ONCE(obj->frontbuffer);
 204 }
 205
 206 static inline unsigned int
 207 i915_gem_object_get_tiling(const struct drm_i915_gem_object *obj)
 208 {
 209         return obj->tiling_and_stride & TILING_MASK;
 210 }
 211
 212 static inline bool
 213 i915_gem_object_is_tiled(const struct drm_i915_gem_object *obj)
 214 {
 215         return i915_gem_object_get_tiling(obj) != I915_TILING_NONE;
 216 }
 217
 218 static inline unsigned int
 219 i915_gem_object_get_stride(const struct drm_i915_gem_object *obj)
 220 {
 221         return obj->tiling_and_stride & STRIDE_MASK;
 222 }
 223
 224 static inline unsigned int
 225 i915_gem_tile_height(unsigned int tiling)
 226 {
 227         GEM_BUG_ON(!tiling);
 228         return tiling == I915_TILING_Y ? 32 : 8;
 229 }
 230
 231 static inline unsigned int
 232 i915_gem_object_get_tile_height(const struct drm_i915_gem_object *obj)
 233 {
 234         return i915_gem_tile_height(i915_gem_object_get_tiling(obj));
 235 }
 236
 237 static inline unsigned int
 238 i915_gem_object_get_tile_row_size(const struct drm_i915_gem_object *obj)
 239 {
 240         return (i915_gem_object_get_stride(obj) *
 241                 i915_gem_object_get_tile_height(obj));
 242 }
 243
 244 int i915_gem_object_set_tiling(struct drm_i915_gem_object *obj,
 245                                unsigned int tiling, unsigned int stride);
 246
 247 struct scatterlist *
 248 i915_gem_object_get_sg(struct drm_i915_gem_object *obj,
 249                        unsigned int n, unsigned int *offset);
 250
 251 struct page *
 252 i915_gem_object_get_page(struct drm_i915_gem_object *obj,
 253                          unsigned int n);
 254
 255 struct page *
 256 i915_gem_object_get_dirty_page(struct drm_i915_gem_object *obj,
 257                                unsigned int n);
 258
 259 dma_addr_t
 260 i915_gem_object_get_dma_address_len(struct drm_i915_gem_object *obj,
 261                                     unsigned long n,
 262                                     unsigned int *len);
 263
 264 dma_addr_t
 265 i915_gem_object_get_dma_address(struct drm_i915_gem_object *obj,
 266                                 unsigned long n);
 267
 268 void __i915_gem_object_set_pages(struct drm_i915_gem_object *obj,
 269                                  struct sg_table *pages,
 270                                  unsigned int sg_page_sizes);
 271
 272 int ____i915_gem_object_get_pages(struct drm_i915_gem_object *obj);
 273 int __i915_gem_object_get_pages(struct drm_i915_gem_object *obj);
 274
 275 enum i915_mm_subclass { /* lockdep subclass for obj->mm.lock/struct_mutex */
 276         I915_MM_NORMAL = 0,
 277         /*
 278          * Only used by struct_mutex, when called "recursively" from
 279          * direct-reclaim-esque. Safe because there is only every one
 280          * struct_mutex in the entire system.
 281          */
 282         I915_MM_SHRINKER = 1,
 283         /*
 284          * Used for obj->mm.lock when allocating pages. Safe because the object
 285          * isn't yet on any LRU, and therefore the shrinker can't deadlock on
 286          * it. As soon as the object has pages, obj->mm.lock nests within
 287          * fs_reclaim.
 288          */
 289         I915_MM_GET_PAGES = 1,
 290 };
 291
 292 static inline int __must_check
 293 i915_gem_object_pin_pages(struct drm_i915_gem_object *obj)
 294 {
 295         might_lock_nested(&obj->mm.lock, I915_MM_GET_PAGES);
 296
 297         if (atomic_inc_not_zero(&obj->mm.pages_pin_count))
 298                 return 0;
 299
 300         return __i915_gem_object_get_pages(obj);
 301 }
 302
 303 static inline bool
 304 i915_gem_object_has_pages(struct drm_i915_gem_object *obj)
 305 {
 306         return !IS_ERR_OR_NULL(READ_ONCE(obj->mm.pages));
 307 }
 308
 309 static inline void
 310 __i915_gem_object_pin_pages(struct drm_i915_gem_object *obj)
 311 {
 312         GEM_BUG_ON(!i915_gem_object_has_pages(obj));
 313
 314         atomic_inc(&obj->mm.pages_pin_count);
 315 }
 316
 317 static inline bool
 318 i915_gem_object_has_pinned_pages(struct drm_i915_gem_object *obj)
 319 {
 320         return atomic_read(&obj->mm.pages_pin_count);
 321 }
 322
 323 static inline void
 324 __i915_gem_object_unpin_pages(struct drm_i915_gem_object *obj)
 325 {
 326         GEM_BUG_ON(!i915_gem_object_has_pages(obj));
 327         GEM_BUG_ON(!i915_gem_object_has_pinned_pages(obj));
 328
 329         atomic_dec(&obj->mm.pages_pin_count);
 330 }
 331
 332 static inline void
 333 i915_gem_object_unpin_pages(struct drm_i915_gem_object *obj)
 334 {
 335         __i915_gem_object_unpin_pages(obj);
 336 }
 337
 338 int __i915_gem_object_put_pages(struct drm_i915_gem_object *obj);
 339 void i915_gem_object_truncate(struct drm_i915_gem_object *obj);
 340 void i915_gem_object_writeback(struct drm_i915_gem_object *obj);
 341
 342 enum i915_map_type {
 343         I915_MAP_WB = 0,
 344         I915_MAP_WC,
 345 #define I915_MAP_OVERRIDE BIT(31)
 346         I915_MAP_FORCE_WB = I915_MAP_WB | I915_MAP_OVERRIDE,
 347         I915_MAP_FORCE_WC = I915_MAP_WC | I915_MAP_OVERRIDE,
 348 };
 349
 350 /**
 351  * i915_gem_object_pin_map - return a contiguous mapping of the entire object
 352  * @obj: the object to map into kernel address space
 353  * @type: the type of mapping, used to select pgprot_t
 354  *
 355  * Calls i915_gem_object_pin_pages() to prevent reaping of the object's
 356  * pages and then returns a contiguous mapping of the backing storage into
 357  * the kernel address space. Based on the @type of mapping, the PTE will be
 358  * set to either WriteBack or WriteCombine (via pgprot_t).
 359  *
 360  * The caller is responsible for calling i915_gem_object_unpin_map() when the
 361  * mapping is no longer required.
 362  *
 363  * Returns the pointer through which to access the mapped object, or an
 364  * ERR_PTR() on error.
 365  */
 366 void *__must_check i915_gem_object_pin_map(struct drm_i915_gem_object *obj,
 367                                            enum i915_map_type type);
 368
 369 void __i915_gem_object_flush_map(struct drm_i915_gem_object *obj,
 370                                  unsigned long offset,
 371                                  unsigned long size);
 372 static inline void i915_gem_object_flush_map(struct drm_i915_gem_object *obj)
 373 {
 374         __i915_gem_object_flush_map(obj, 0, obj->base.size);
 375 }
 376
 377 /**
 378  * i915_gem_object_unpin_map - releases an earlier mapping
 379  * @obj: the object to unmap
 380  *
 381  * After pinning the object and mapping its pages, once you are finished
 382  * with your access, call i915_gem_object_unpin_map() to release the pin
 383  * upon the mapping. Once the pin count reaches zero, that mapping may be
 384  * removed.
 385  */
 386 static inline void i915_gem_object_unpin_map(struct drm_i915_gem_object *obj)
 387 {
 388         i915_gem_object_unpin_pages(obj);
 389 }
 390
 391 void
 392 i915_gem_object_flush_write_domain(struct drm_i915_gem_object *obj,
 393                                    unsigned int flush_domains);
 394
 395 int i915_gem_object_prepare_read(struct drm_i915_gem_object *obj,
 396                                  unsigned int *needs_clflush);
 397 int i915_gem_object_prepare_write(struct drm_i915_gem_object *obj,
 398                                   unsigned int *needs_clflush);
 399 #define CLFLUSH_BEFORE  BIT(0)
 400 #define CLFLUSH_AFTER   BIT(1)
 401 #define CLFLUSH_FLAGS   (CLFLUSH_BEFORE | CLFLUSH_AFTER)
 402
 403 static inline void
 404 i915_gem_object_finish_access(struct drm_i915_gem_object *obj)
 405 {
 406         i915_gem_object_unpin_pages(obj);
 407         i915_gem_object_unlock(obj);
 408 }
 409
 410 static inline struct intel_engine_cs *
 411 i915_gem_object_last_write_engine(struct drm_i915_gem_object *obj)
 412 {
 413         struct intel_engine_cs *engine = NULL;
 414         struct dma_fence *fence;
 415
 416         rcu_read_lock();
 417         fence = dma_resv_get_excl_rcu(obj->base.resv);
 418         rcu_read_unlock();
 419
 420         if (fence && dma_fence_is_i915(fence) && !dma_fence_is_signaled(fence))
 421                 engine = to_request(fence)->engine;
 422         dma_fence_put(fence);
 423
 424         return engine;
 425 }
 426
 427 void i915_gem_object_set_cache_coherency(struct drm_i915_gem_object *obj,
 428                                          unsigned int cache_level);
 429 void i915_gem_object_flush_if_display(struct drm_i915_gem_object *obj);
 430
 431 int __must_check
 432 i915_gem_object_set_to_wc_domain(struct drm_i915_gem_object *obj, bool write);
 433 int __must_check
 434 i915_gem_object_set_to_gtt_domain(struct drm_i915_gem_object *obj, bool write);
 435 int __must_check
 436 i915_gem_object_set_to_cpu_domain(struct drm_i915_gem_object *obj, bool write);
 437 struct i915_vma * __must_check
 438 i915_gem_object_pin_to_display_plane(struct drm_i915_gem_object *obj,
 439                                      u32 alignment,
 440                                      const struct i915_ggtt_view *view,
 441                                      unsigned int flags);
 442 void i915_gem_object_unpin_from_display_plane(struct i915_vma *vma);
 443
 444 void i915_gem_object_make_unshrinkable(struct drm_i915_gem_object *obj);
 445 void i915_gem_object_make_shrinkable(struct drm_i915_gem_object *obj);
 446 void i915_gem_object_make_purgeable(struct drm_i915_gem_object *obj);
 447
 448 static inline bool cpu_write_needs_clflush(struct drm_i915_gem_object *obj)
 449 {
 450         if (obj->cache_dirty)
 451                 return false;
 452
 453         if (!(obj->cache_coherent & I915_BO_CACHE_COHERENT_FOR_WRITE))
 454                 return true;
 455
 456         /* Currently in use by HW (display engine)? Keep flushed. */
 457         return i915_gem_object_is_framebuffer(obj);
 458 }
 459
 460 static inline void __start_cpu_write(struct drm_i915_gem_object *obj)
 461 {
 462         obj->read_domains = I915_GEM_DOMAIN_CPU;
 463         obj->write_domain = I915_GEM_DOMAIN_CPU;
 464         if (cpu_write_needs_clflush(obj))
 465                 obj->cache_dirty = true;
 466 }
 467
 468 int i915_gem_object_wait(struct drm_i915_gem_object *obj,
 469                          unsigned int flags,
 470                          long timeout);
 471 int i915_gem_object_wait_priority(struct drm_i915_gem_object *obj,
 472                                   unsigned int flags,
 473                                   const struct i915_sched_attr *attr);
 474
 475 void __i915_gem_object_flush_frontbuffer(struct drm_i915_gem_object *obj,
 476                                          enum fb_op_origin origin);
 477 void __i915_gem_object_invalidate_frontbuffer(struct drm_i915_gem_object *obj,
 478                                               enum fb_op_origin origin);
 479
 480 static inline void
 481 i915_gem_object_flush_frontbuffer(struct drm_i915_gem_object *obj,
 482                                   enum fb_op_origin origin)
 483 {
 484         if (unlikely(rcu_access_pointer(obj->frontbuffer)))
 485                 __i915_gem_object_flush_frontbuffer(obj, origin);
 486 }
 487
 488 static inline void
 489 i915_gem_object_invalidate_frontbuffer(struct drm_i915_gem_object *obj,
 490                                        enum fb_op_origin origin)
 491 {
 492         if (unlikely(rcu_access_pointer(obj->frontbuffer)))
 493                 __i915_gem_object_invalidate_frontbuffer(obj, origin);
 494 }
 495
 496 #endif