i915_gem_object.c (23095B)
1/* 2 * Copyright © 2017 Intel Corporation 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the "Software"), 6 * to deal in the Software without restriction, including without limitation 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 * and/or sell copies of the Software, and to permit persons to whom the 9 * Software is furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice (including the next 12 * paragraph) shall be included in all copies or substantial portions of the 13 * Software. 14 * 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS 21 * IN THE SOFTWARE. 22 * 23 */ 24 25#include <linux/highmem.h> 26#include <linux/sched/mm.h> 27 28#include <drm/drm_cache.h> 29 30#include "display/intel_frontbuffer.h" 31#include "pxp/intel_pxp.h" 32 33#include "i915_drv.h" 34#include "i915_file_private.h" 35#include "i915_gem_clflush.h" 36#include "i915_gem_context.h" 37#include "i915_gem_dmabuf.h" 38#include "i915_gem_mman.h" 39#include "i915_gem_object.h" 40#include "i915_gem_ttm.h" 41#include "i915_memcpy.h" 42#include "i915_trace.h" 43 44static struct kmem_cache *slab_objects; 45 46static const struct drm_gem_object_funcs i915_gem_object_funcs; 47 48struct drm_i915_gem_object *i915_gem_object_alloc(void) 49{ 50 struct drm_i915_gem_object *obj; 51 52 obj = kmem_cache_zalloc(slab_objects, GFP_KERNEL); 53 if (!obj) 54 return NULL; 55 obj->base.funcs = &i915_gem_object_funcs; 56 57 return obj; 58} 59 60void i915_gem_object_free(struct drm_i915_gem_object *obj) 61{ 62 return kmem_cache_free(slab_objects, obj); 63} 64 65void i915_gem_object_init(struct drm_i915_gem_object *obj, 66 const struct drm_i915_gem_object_ops *ops, 67 struct lock_class_key *key, unsigned flags) 68{ 69 /* 70 * A gem object is embedded both in a struct ttm_buffer_object :/ and 71 * in a drm_i915_gem_object. Make sure they are aliased. 72 */ 73 BUILD_BUG_ON(offsetof(typeof(*obj), base) != 74 offsetof(typeof(*obj), __do_not_access.base)); 75 76 spin_lock_init(&obj->vma.lock); 77 INIT_LIST_HEAD(&obj->vma.list); 78 79 INIT_LIST_HEAD(&obj->mm.link); 80 81 INIT_LIST_HEAD(&obj->lut_list); 82 spin_lock_init(&obj->lut_lock); 83 84 spin_lock_init(&obj->mmo.lock); 85 obj->mmo.offsets = RB_ROOT; 86 87 init_rcu_head(&obj->rcu); 88 89 obj->ops = ops; 90 GEM_BUG_ON(flags & ~I915_BO_ALLOC_FLAGS); 91 obj->flags = flags; 92 93 obj->mm.madv = I915_MADV_WILLNEED; 94 INIT_RADIX_TREE(&obj->mm.get_page.radix, GFP_KERNEL | __GFP_NOWARN); 95 mutex_init(&obj->mm.get_page.lock); 96 INIT_RADIX_TREE(&obj->mm.get_dma_page.radix, GFP_KERNEL | __GFP_NOWARN); 97 mutex_init(&obj->mm.get_dma_page.lock); 98} 99 100/** 101 * __i915_gem_object_fini - Clean up a GEM object initialization 102 * @obj: The gem object to cleanup 103 * 104 * This function cleans up gem object fields that are set up by 105 * drm_gem_private_object_init() and i915_gem_object_init(). 106 * It's primarily intended as a helper for backends that need to 107 * clean up the gem object in separate steps. 108 */ 109void __i915_gem_object_fini(struct drm_i915_gem_object *obj) 110{ 111 mutex_destroy(&obj->mm.get_page.lock); 112 mutex_destroy(&obj->mm.get_dma_page.lock); 113 dma_resv_fini(&obj->base._resv); 114} 115 116/** 117 * i915_gem_object_set_cache_coherency - Mark up the object's coherency levels 118 * for a given cache_level 119 * @obj: #drm_i915_gem_object 120 * @cache_level: cache level 121 */ 122void i915_gem_object_set_cache_coherency(struct drm_i915_gem_object *obj, 123 unsigned int cache_level) 124{ 125 struct drm_i915_private *i915 = to_i915(obj->base.dev); 126 127 obj->cache_level = cache_level; 128 129 if (cache_level != I915_CACHE_NONE) 130 obj->cache_coherent = (I915_BO_CACHE_COHERENT_FOR_READ | 131 I915_BO_CACHE_COHERENT_FOR_WRITE); 132 else if (HAS_LLC(i915)) 133 obj->cache_coherent = I915_BO_CACHE_COHERENT_FOR_READ; 134 else 135 obj->cache_coherent = 0; 136 137 obj->cache_dirty = 138 !(obj->cache_coherent & I915_BO_CACHE_COHERENT_FOR_WRITE) && 139 !IS_DGFX(i915); 140} 141 142bool i915_gem_object_can_bypass_llc(struct drm_i915_gem_object *obj) 143{ 144 struct drm_i915_private *i915 = to_i915(obj->base.dev); 145 146 /* 147 * This is purely from a security perspective, so we simply don't care 148 * about non-userspace objects being able to bypass the LLC. 149 */ 150 if (!(obj->flags & I915_BO_ALLOC_USER)) 151 return false; 152 153 /* 154 * EHL and JSL add the 'Bypass LLC' MOCS entry, which should make it 155 * possible for userspace to bypass the GTT caching bits set by the 156 * kernel, as per the given object cache_level. This is troublesome 157 * since the heavy flush we apply when first gathering the pages is 158 * skipped if the kernel thinks the object is coherent with the GPU. As 159 * a result it might be possible to bypass the cache and read the 160 * contents of the page directly, which could be stale data. If it's 161 * just a case of userspace shooting themselves in the foot then so be 162 * it, but since i915 takes the stance of always zeroing memory before 163 * handing it to userspace, we need to prevent this. 164 */ 165 return IS_JSL_EHL(i915); 166} 167 168static void i915_gem_close_object(struct drm_gem_object *gem, struct drm_file *file) 169{ 170 struct drm_i915_gem_object *obj = to_intel_bo(gem); 171 struct drm_i915_file_private *fpriv = file->driver_priv; 172 struct i915_lut_handle bookmark = {}; 173 struct i915_mmap_offset *mmo, *mn; 174 struct i915_lut_handle *lut, *ln; 175 LIST_HEAD(close); 176 177 spin_lock(&obj->lut_lock); 178 list_for_each_entry_safe(lut, ln, &obj->lut_list, obj_link) { 179 struct i915_gem_context *ctx = lut->ctx; 180 181 if (ctx && ctx->file_priv == fpriv) { 182 i915_gem_context_get(ctx); 183 list_move(&lut->obj_link, &close); 184 } 185 186 /* Break long locks, and carefully continue on from this spot */ 187 if (&ln->obj_link != &obj->lut_list) { 188 list_add_tail(&bookmark.obj_link, &ln->obj_link); 189 if (cond_resched_lock(&obj->lut_lock)) 190 list_safe_reset_next(&bookmark, ln, obj_link); 191 __list_del_entry(&bookmark.obj_link); 192 } 193 } 194 spin_unlock(&obj->lut_lock); 195 196 spin_lock(&obj->mmo.lock); 197 rbtree_postorder_for_each_entry_safe(mmo, mn, &obj->mmo.offsets, offset) 198 drm_vma_node_revoke(&mmo->vma_node, file); 199 spin_unlock(&obj->mmo.lock); 200 201 list_for_each_entry_safe(lut, ln, &close, obj_link) { 202 struct i915_gem_context *ctx = lut->ctx; 203 struct i915_vma *vma; 204 205 /* 206 * We allow the process to have multiple handles to the same 207 * vma, in the same fd namespace, by virtue of flink/open. 208 */ 209 210 mutex_lock(&ctx->lut_mutex); 211 vma = radix_tree_delete(&ctx->handles_vma, lut->handle); 212 if (vma) { 213 GEM_BUG_ON(vma->obj != obj); 214 GEM_BUG_ON(!atomic_read(&vma->open_count)); 215 i915_vma_close(vma); 216 } 217 mutex_unlock(&ctx->lut_mutex); 218 219 i915_gem_context_put(lut->ctx); 220 i915_lut_handle_free(lut); 221 i915_gem_object_put(obj); 222 } 223} 224 225void __i915_gem_free_object_rcu(struct rcu_head *head) 226{ 227 struct drm_i915_gem_object *obj = 228 container_of(head, typeof(*obj), rcu); 229 struct drm_i915_private *i915 = to_i915(obj->base.dev); 230 231 i915_gem_object_free(obj); 232 233 GEM_BUG_ON(!atomic_read(&i915->mm.free_count)); 234 atomic_dec(&i915->mm.free_count); 235} 236 237static void __i915_gem_object_free_mmaps(struct drm_i915_gem_object *obj) 238{ 239 /* Skip serialisation and waking the device if known to be not used. */ 240 241 if (obj->userfault_count) 242 i915_gem_object_release_mmap_gtt(obj); 243 244 if (!RB_EMPTY_ROOT(&obj->mmo.offsets)) { 245 struct i915_mmap_offset *mmo, *mn; 246 247 i915_gem_object_release_mmap_offset(obj); 248 249 rbtree_postorder_for_each_entry_safe(mmo, mn, 250 &obj->mmo.offsets, 251 offset) { 252 drm_vma_offset_remove(obj->base.dev->vma_offset_manager, 253 &mmo->vma_node); 254 kfree(mmo); 255 } 256 obj->mmo.offsets = RB_ROOT; 257 } 258} 259 260/** 261 * __i915_gem_object_pages_fini - Clean up pages use of a gem object 262 * @obj: The gem object to clean up 263 * 264 * This function cleans up usage of the object mm.pages member. It 265 * is intended for backends that need to clean up a gem object in 266 * separate steps and needs to be called when the object is idle before 267 * the object's backing memory is freed. 268 */ 269void __i915_gem_object_pages_fini(struct drm_i915_gem_object *obj) 270{ 271 assert_object_held(obj); 272 273 if (!list_empty(&obj->vma.list)) { 274 struct i915_vma *vma; 275 276 spin_lock(&obj->vma.lock); 277 while ((vma = list_first_entry_or_null(&obj->vma.list, 278 struct i915_vma, 279 obj_link))) { 280 GEM_BUG_ON(vma->obj != obj); 281 spin_unlock(&obj->vma.lock); 282 283 i915_vma_destroy(vma); 284 285 spin_lock(&obj->vma.lock); 286 } 287 spin_unlock(&obj->vma.lock); 288 } 289 290 __i915_gem_object_free_mmaps(obj); 291 292 atomic_set(&obj->mm.pages_pin_count, 0); 293 __i915_gem_object_put_pages(obj); 294 GEM_BUG_ON(i915_gem_object_has_pages(obj)); 295} 296 297void __i915_gem_free_object(struct drm_i915_gem_object *obj) 298{ 299 trace_i915_gem_object_destroy(obj); 300 301 GEM_BUG_ON(!list_empty(&obj->lut_list)); 302 303 bitmap_free(obj->bit_17); 304 305 if (obj->base.import_attach) 306 drm_prime_gem_destroy(&obj->base, NULL); 307 308 drm_gem_free_mmap_offset(&obj->base); 309 310 if (obj->ops->release) 311 obj->ops->release(obj); 312 313 if (obj->mm.n_placements > 1) 314 kfree(obj->mm.placements); 315 316 if (obj->shares_resv_from) 317 i915_vm_resv_put(obj->shares_resv_from); 318 319 __i915_gem_object_fini(obj); 320} 321 322static void __i915_gem_free_objects(struct drm_i915_private *i915, 323 struct llist_node *freed) 324{ 325 struct drm_i915_gem_object *obj, *on; 326 327 llist_for_each_entry_safe(obj, on, freed, freed) { 328 might_sleep(); 329 if (obj->ops->delayed_free) { 330 obj->ops->delayed_free(obj); 331 continue; 332 } 333 334 if (!i915_gem_object_trylock(obj, NULL)) { 335 /* busy, toss it back to the pile */ 336 if (llist_add(&obj->freed, &i915->mm.free_list)) 337 queue_delayed_work(i915->wq, &i915->mm.free_work, msecs_to_jiffies(10)); 338 continue; 339 } 340 341 __i915_gem_object_pages_fini(obj); 342 i915_gem_object_unlock(obj); 343 __i915_gem_free_object(obj); 344 345 /* But keep the pointer alive for RCU-protected lookups */ 346 call_rcu(&obj->rcu, __i915_gem_free_object_rcu); 347 cond_resched(); 348 } 349} 350 351void i915_gem_flush_free_objects(struct drm_i915_private *i915) 352{ 353 struct llist_node *freed = llist_del_all(&i915->mm.free_list); 354 355 if (unlikely(freed)) 356 __i915_gem_free_objects(i915, freed); 357} 358 359static void __i915_gem_free_work(struct work_struct *work) 360{ 361 struct drm_i915_private *i915 = 362 container_of(work, struct drm_i915_private, mm.free_work.work); 363 364 i915_gem_flush_free_objects(i915); 365} 366 367static void i915_gem_free_object(struct drm_gem_object *gem_obj) 368{ 369 struct drm_i915_gem_object *obj = to_intel_bo(gem_obj); 370 struct drm_i915_private *i915 = to_i915(obj->base.dev); 371 372 GEM_BUG_ON(i915_gem_object_is_framebuffer(obj)); 373 374 /* 375 * Before we free the object, make sure any pure RCU-only 376 * read-side critical sections are complete, e.g. 377 * i915_gem_busy_ioctl(). For the corresponding synchronized 378 * lookup see i915_gem_object_lookup_rcu(). 379 */ 380 atomic_inc(&i915->mm.free_count); 381 382 /* 383 * Since we require blocking on struct_mutex to unbind the freed 384 * object from the GPU before releasing resources back to the 385 * system, we can not do that directly from the RCU callback (which may 386 * be a softirq context), but must instead then defer that work onto a 387 * kthread. We use the RCU callback rather than move the freed object 388 * directly onto the work queue so that we can mix between using the 389 * worker and performing frees directly from subsequent allocations for 390 * crude but effective memory throttling. 391 */ 392 393 if (llist_add(&obj->freed, &i915->mm.free_list)) 394 queue_delayed_work(i915->wq, &i915->mm.free_work, 0); 395} 396 397void __i915_gem_object_flush_frontbuffer(struct drm_i915_gem_object *obj, 398 enum fb_op_origin origin) 399{ 400 struct intel_frontbuffer *front; 401 402 front = __intel_frontbuffer_get(obj); 403 if (front) { 404 intel_frontbuffer_flush(front, origin); 405 intel_frontbuffer_put(front); 406 } 407} 408 409void __i915_gem_object_invalidate_frontbuffer(struct drm_i915_gem_object *obj, 410 enum fb_op_origin origin) 411{ 412 struct intel_frontbuffer *front; 413 414 front = __intel_frontbuffer_get(obj); 415 if (front) { 416 intel_frontbuffer_invalidate(front, origin); 417 intel_frontbuffer_put(front); 418 } 419} 420 421static void 422i915_gem_object_read_from_page_kmap(struct drm_i915_gem_object *obj, u64 offset, void *dst, int size) 423{ 424 void *src_map; 425 void *src_ptr; 426 427 src_map = kmap_atomic(i915_gem_object_get_page(obj, offset >> PAGE_SHIFT)); 428 429 src_ptr = src_map + offset_in_page(offset); 430 if (!(obj->cache_coherent & I915_BO_CACHE_COHERENT_FOR_READ)) 431 drm_clflush_virt_range(src_ptr, size); 432 memcpy(dst, src_ptr, size); 433 434 kunmap_atomic(src_map); 435} 436 437static void 438i915_gem_object_read_from_page_iomap(struct drm_i915_gem_object *obj, u64 offset, void *dst, int size) 439{ 440 void __iomem *src_map; 441 void __iomem *src_ptr; 442 dma_addr_t dma = i915_gem_object_get_dma_address(obj, offset >> PAGE_SHIFT); 443 444 src_map = io_mapping_map_wc(&obj->mm.region->iomap, 445 dma - obj->mm.region->region.start, 446 PAGE_SIZE); 447 448 src_ptr = src_map + offset_in_page(offset); 449 if (!i915_memcpy_from_wc(dst, (void __force *)src_ptr, size)) 450 memcpy_fromio(dst, src_ptr, size); 451 452 io_mapping_unmap(src_map); 453} 454 455/** 456 * i915_gem_object_read_from_page - read data from the page of a GEM object 457 * @obj: GEM object to read from 458 * @offset: offset within the object 459 * @dst: buffer to store the read data 460 * @size: size to read 461 * 462 * Reads data from @obj at the specified offset. The requested region to read 463 * from can't cross a page boundary. The caller must ensure that @obj pages 464 * are pinned and that @obj is synced wrt. any related writes. 465 * 466 * Return: %0 on success or -ENODEV if the type of @obj's backing store is 467 * unsupported. 468 */ 469int i915_gem_object_read_from_page(struct drm_i915_gem_object *obj, u64 offset, void *dst, int size) 470{ 471 GEM_BUG_ON(offset >= obj->base.size); 472 GEM_BUG_ON(offset_in_page(offset) > PAGE_SIZE - size); 473 GEM_BUG_ON(!i915_gem_object_has_pinned_pages(obj)); 474 475 if (i915_gem_object_has_struct_page(obj)) 476 i915_gem_object_read_from_page_kmap(obj, offset, dst, size); 477 else if (i915_gem_object_has_iomem(obj)) 478 i915_gem_object_read_from_page_iomap(obj, offset, dst, size); 479 else 480 return -ENODEV; 481 482 return 0; 483} 484 485/** 486 * i915_gem_object_evictable - Whether object is likely evictable after unbind. 487 * @obj: The object to check 488 * 489 * This function checks whether the object is likely unvictable after unbind. 490 * If the object is not locked when checking, the result is only advisory. 491 * If the object is locked when checking, and the function returns true, 492 * then an eviction should indeed be possible. But since unlocked vma 493 * unpinning and unbinding is currently possible, the object can actually 494 * become evictable even if this function returns false. 495 * 496 * Return: true if the object may be evictable. False otherwise. 497 */ 498bool i915_gem_object_evictable(struct drm_i915_gem_object *obj) 499{ 500 struct i915_vma *vma; 501 int pin_count = atomic_read(&obj->mm.pages_pin_count); 502 503 if (!pin_count) 504 return true; 505 506 spin_lock(&obj->vma.lock); 507 list_for_each_entry(vma, &obj->vma.list, obj_link) { 508 if (i915_vma_is_pinned(vma)) { 509 spin_unlock(&obj->vma.lock); 510 return false; 511 } 512 if (atomic_read(&vma->pages_count)) 513 pin_count--; 514 } 515 spin_unlock(&obj->vma.lock); 516 GEM_WARN_ON(pin_count < 0); 517 518 return pin_count == 0; 519} 520 521/** 522 * i915_gem_object_migratable - Whether the object is migratable out of the 523 * current region. 524 * @obj: Pointer to the object. 525 * 526 * Return: Whether the object is allowed to be resident in other 527 * regions than the current while pages are present. 528 */ 529bool i915_gem_object_migratable(struct drm_i915_gem_object *obj) 530{ 531 struct intel_memory_region *mr = READ_ONCE(obj->mm.region); 532 533 if (!mr) 534 return false; 535 536 return obj->mm.n_placements > 1; 537} 538 539/** 540 * i915_gem_object_has_struct_page - Whether the object is page-backed 541 * @obj: The object to query. 542 * 543 * This function should only be called while the object is locked or pinned, 544 * otherwise the page backing may change under the caller. 545 * 546 * Return: True if page-backed, false otherwise. 547 */ 548bool i915_gem_object_has_struct_page(const struct drm_i915_gem_object *obj) 549{ 550#ifdef CONFIG_LOCKDEP 551 if (IS_DGFX(to_i915(obj->base.dev)) && 552 i915_gem_object_evictable((void __force *)obj)) 553 assert_object_held_shared(obj); 554#endif 555 return obj->mem_flags & I915_BO_FLAG_STRUCT_PAGE; 556} 557 558/** 559 * i915_gem_object_has_iomem - Whether the object is iomem-backed 560 * @obj: The object to query. 561 * 562 * This function should only be called while the object is locked or pinned, 563 * otherwise the iomem backing may change under the caller. 564 * 565 * Return: True if iomem-backed, false otherwise. 566 */ 567bool i915_gem_object_has_iomem(const struct drm_i915_gem_object *obj) 568{ 569#ifdef CONFIG_LOCKDEP 570 if (IS_DGFX(to_i915(obj->base.dev)) && 571 i915_gem_object_evictable((void __force *)obj)) 572 assert_object_held_shared(obj); 573#endif 574 return obj->mem_flags & I915_BO_FLAG_IOMEM; 575} 576 577/** 578 * i915_gem_object_can_migrate - Whether an object likely can be migrated 579 * 580 * @obj: The object to migrate 581 * @id: The region intended to migrate to 582 * 583 * Check whether the object backend supports migration to the 584 * given region. Note that pinning may affect the ability to migrate as 585 * returned by this function. 586 * 587 * This function is primarily intended as a helper for checking the 588 * possibility to migrate objects and might be slightly less permissive 589 * than i915_gem_object_migrate() when it comes to objects with the 590 * I915_BO_ALLOC_USER flag set. 591 * 592 * Return: true if migration is possible, false otherwise. 593 */ 594bool i915_gem_object_can_migrate(struct drm_i915_gem_object *obj, 595 enum intel_region_id id) 596{ 597 struct drm_i915_private *i915 = to_i915(obj->base.dev); 598 unsigned int num_allowed = obj->mm.n_placements; 599 struct intel_memory_region *mr; 600 unsigned int i; 601 602 GEM_BUG_ON(id >= INTEL_REGION_UNKNOWN); 603 GEM_BUG_ON(obj->mm.madv != I915_MADV_WILLNEED); 604 605 mr = i915->mm.regions[id]; 606 if (!mr) 607 return false; 608 609 if (!IS_ALIGNED(obj->base.size, mr->min_page_size)) 610 return false; 611 612 if (obj->mm.region == mr) 613 return true; 614 615 if (!i915_gem_object_evictable(obj)) 616 return false; 617 618 if (!obj->ops->migrate) 619 return false; 620 621 if (!(obj->flags & I915_BO_ALLOC_USER)) 622 return true; 623 624 if (num_allowed == 0) 625 return false; 626 627 for (i = 0; i < num_allowed; ++i) { 628 if (mr == obj->mm.placements[i]) 629 return true; 630 } 631 632 return false; 633} 634 635/** 636 * i915_gem_object_migrate - Migrate an object to the desired region id 637 * @obj: The object to migrate. 638 * @ww: An optional struct i915_gem_ww_ctx. If NULL, the backend may 639 * not be successful in evicting other objects to make room for this object. 640 * @id: The region id to migrate to. 641 * 642 * Attempt to migrate the object to the desired memory region. The 643 * object backend must support migration and the object may not be 644 * pinned, (explicitly pinned pages or pinned vmas). The object must 645 * be locked. 646 * On successful completion, the object will have pages pointing to 647 * memory in the new region, but an async migration task may not have 648 * completed yet, and to accomplish that, i915_gem_object_wait_migration() 649 * must be called. 650 * 651 * Note: the @ww parameter is not used yet, but included to make sure 652 * callers put some effort into obtaining a valid ww ctx if one is 653 * available. 654 * 655 * Return: 0 on success. Negative error code on failure. In particular may 656 * return -ENXIO on lack of region space, -EDEADLK for deadlock avoidance 657 * if @ww is set, -EINTR or -ERESTARTSYS if signal pending, and 658 * -EBUSY if the object is pinned. 659 */ 660int i915_gem_object_migrate(struct drm_i915_gem_object *obj, 661 struct i915_gem_ww_ctx *ww, 662 enum intel_region_id id) 663{ 664 struct drm_i915_private *i915 = to_i915(obj->base.dev); 665 struct intel_memory_region *mr; 666 667 GEM_BUG_ON(id >= INTEL_REGION_UNKNOWN); 668 GEM_BUG_ON(obj->mm.madv != I915_MADV_WILLNEED); 669 assert_object_held(obj); 670 671 mr = i915->mm.regions[id]; 672 GEM_BUG_ON(!mr); 673 674 if (!i915_gem_object_can_migrate(obj, id)) 675 return -EINVAL; 676 677 if (!obj->ops->migrate) { 678 if (GEM_WARN_ON(obj->mm.region != mr)) 679 return -EINVAL; 680 return 0; 681 } 682 683 return obj->ops->migrate(obj, mr); 684} 685 686/** 687 * i915_gem_object_placement_possible - Check whether the object can be 688 * placed at certain memory type 689 * @obj: Pointer to the object 690 * @type: The memory type to check 691 * 692 * Return: True if the object can be placed in @type. False otherwise. 693 */ 694bool i915_gem_object_placement_possible(struct drm_i915_gem_object *obj, 695 enum intel_memory_type type) 696{ 697 unsigned int i; 698 699 if (!obj->mm.n_placements) { 700 switch (type) { 701 case INTEL_MEMORY_LOCAL: 702 return i915_gem_object_has_iomem(obj); 703 case INTEL_MEMORY_SYSTEM: 704 return i915_gem_object_has_pages(obj); 705 default: 706 /* Ignore stolen for now */ 707 GEM_BUG_ON(1); 708 return false; 709 } 710 } 711 712 for (i = 0; i < obj->mm.n_placements; i++) { 713 if (obj->mm.placements[i]->type == type) 714 return true; 715 } 716 717 return false; 718} 719 720void i915_gem_init__objects(struct drm_i915_private *i915) 721{ 722 INIT_DELAYED_WORK(&i915->mm.free_work, __i915_gem_free_work); 723} 724 725void i915_objects_module_exit(void) 726{ 727 kmem_cache_destroy(slab_objects); 728} 729 730int __init i915_objects_module_init(void) 731{ 732 slab_objects = KMEM_CACHE(drm_i915_gem_object, SLAB_HWCACHE_ALIGN); 733 if (!slab_objects) 734 return -ENOMEM; 735 736 return 0; 737} 738 739static const struct drm_gem_object_funcs i915_gem_object_funcs = { 740 .free = i915_gem_free_object, 741 .close = i915_gem_close_object, 742 .export = i915_gem_prime_export, 743}; 744 745/** 746 * i915_gem_object_get_moving_fence - Get the object's moving fence if any 747 * @obj: The object whose moving fence to get. 748 * @fence: The resulting fence 749 * 750 * A non-signaled moving fence means that there is an async operation 751 * pending on the object that needs to be waited on before setting up 752 * any GPU- or CPU PTEs to the object's pages. 753 * 754 * Return: Negative error code or 0 for success. 755 */ 756int i915_gem_object_get_moving_fence(struct drm_i915_gem_object *obj, 757 struct dma_fence **fence) 758{ 759 return dma_resv_get_singleton(obj->base.resv, DMA_RESV_USAGE_KERNEL, 760 fence); 761} 762 763/** 764 * i915_gem_object_wait_moving_fence - Wait for the object's moving fence if any 765 * @obj: The object whose moving fence to wait for. 766 * @intr: Whether to wait interruptible. 767 * 768 * If the moving fence signaled without an error, it is detached from the 769 * object and put. 770 * 771 * Return: 0 if successful, -ERESTARTSYS if the wait was interrupted, 772 * negative error code if the async operation represented by the 773 * moving fence failed. 774 */ 775int i915_gem_object_wait_moving_fence(struct drm_i915_gem_object *obj, 776 bool intr) 777{ 778 long ret; 779 780 assert_object_held(obj); 781 782 ret = dma_resv_wait_timeout(obj->base. resv, DMA_RESV_USAGE_KERNEL, 783 intr, MAX_SCHEDULE_TIMEOUT); 784 if (!ret) 785 ret = -ETIME; 786 787 return ret < 0 ? ret : 0; 788} 789 790#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST) 791#include "selftests/huge_gem_object.c" 792#include "selftests/huge_pages.c" 793#include "selftests/i915_gem_migrate.c" 794#include "selftests/i915_gem_object.c" 795#include "selftests/i915_gem_coherency.c" 796#endif