1/* 2 * Copyright �� 2016 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/sched/mm.h> 26#include <linux/dma-fence-array.h> 27#include <drm/drm_gem.h> 28 29#include "display/intel_display.h" 30#include "display/intel_frontbuffer.h" 31#include "gem/i915_gem_lmem.h" 32#include "gem/i915_gem_object_frontbuffer.h" 33#include "gem/i915_gem_tiling.h" 34#include "gt/intel_engine.h" 35#include "gt/intel_engine_heartbeat.h" 36#include "gt/intel_gt.h" 37#include "gt/intel_gt_pm.h" 38#include "gt/intel_gt_requests.h" 39#include "gt/intel_tlb.h" 40 41#include "i915_drv.h" 42#include "i915_gem_evict.h" 43#include "i915_sw_fence_work.h" 44#include "i915_trace.h" 45#include "i915_vma.h" 46#include "i915_vma_resource.h" 47 48static inline void assert_vma_held_evict(const struct i915_vma *vma) 49{ 50 /* 51 * We may be forced to unbind when the vm is dead, to clean it up. 52 * This is the only exception to the requirement of the object lock 53 * being held. 54 */ 55 if (kref_read(&vma->vm->ref)) 56 assert_object_held_shared(vma->obj); 57} 58 59static struct kmem_cache *slab_vmas; 60 61static struct i915_vma *i915_vma_alloc(void) 62{ 63 return kmem_cache_zalloc(slab_vmas, GFP_KERNEL); 64} 65 66static void i915_vma_free(struct i915_vma *vma) 67{ 68 return kmem_cache_free(slab_vmas, vma); 69} 70 71#if IS_ENABLED(CONFIG_DRM_I915_ERRLOG_GEM) && IS_ENABLED(CONFIG_DRM_DEBUG_MM) 72 73#include <linux/stackdepot.h> 74 75static void vma_print_allocator(struct i915_vma *vma, const char *reason) 76{ 77 char buf[512]; 78 79 if (!vma->node.stack) { 80 drm_dbg(vma->obj->base.dev, 81 "vma.node [%08llx + %08llx] %s: unknown owner\n", 82 vma->node.start, vma->node.size, reason); 83 return; 84 } 85 86 stack_depot_snprint(vma->node.stack, buf, sizeof(buf), 0); 87 drm_dbg(vma->obj->base.dev, 88 "vma.node [%08llx + %08llx] %s: inserted at %s\n", 89 vma->node.start, vma->node.size, reason, buf); 90} 91 92#else 93 94static void vma_print_allocator(struct i915_vma *vma, const char *reason) 95{ 96} 97 98#endif 99 100static inline struct i915_vma *active_to_vma(struct i915_active *ref) 101{ 102 return container_of(ref, typeof(struct i915_vma), active); 103} 104 105static int __i915_vma_active(struct i915_active *ref) 106{ 107 struct i915_vma *vma = active_to_vma(ref); 108 109 if (!i915_vma_tryget(vma)) 110 return -ENOENT; 111 112 /* 113 * Exclude global GTT VMA from holding a GT wakeref 114 * while active, otherwise GPU never goes idle. 115 */ 116 if (!i915_vma_is_ggtt(vma)) { 117 /* 118 * Since we and our _retire() counterpart can be 119 * called asynchronously, storing a wakeref tracking 120 * handle inside struct i915_vma is not safe, and 121 * there is no other good place for that. Hence, 122 * use untracked variants of intel_gt_pm_get/put(). 123 */ 124 intel_gt_pm_get_untracked(vma->vm->gt); 125 } 126 127 return 0; 128} 129 130static void __i915_vma_retire(struct i915_active *ref) 131{ 132 struct i915_vma *vma = active_to_vma(ref); 133 134 if (!i915_vma_is_ggtt(vma)) { 135 /* 136 * Since we can be called from atomic contexts, 137 * use an async variant of intel_gt_pm_put(). 138 */ 139 intel_gt_pm_put_async_untracked(vma->vm->gt); 140 } 141 142 i915_vma_put(vma); 143} 144 145static struct i915_vma * 146vma_create(struct drm_i915_gem_object *obj, 147 struct i915_address_space *vm, 148 const struct i915_gtt_view *view) 149{ 150 struct i915_vma *pos = ERR_PTR(-E2BIG); 151 struct i915_vma *vma; 152 struct rb_node *rb, **p; 153 int err; 154 155 /* The aliasing_ppgtt should never be used directly! */ 156 GEM_BUG_ON(vm == &vm->gt->ggtt->alias->vm); 157 158 vma = i915_vma_alloc(); 159 if (vma == NULL) 160 return ERR_PTR(-ENOMEM); 161 162 vma->ops = &vm->vma_ops; 163 vma->obj = obj; 164 vma->size = obj->base.size; 165 vma->display_alignment = I915_GTT_MIN_ALIGNMENT; 166 167 i915_active_init(&vma->active, __i915_vma_active, __i915_vma_retire, 0); 168 169 /* Declare ourselves safe for use inside shrinkers */ 170 if (IS_ENABLED(CONFIG_LOCKDEP)) { 171 fs_reclaim_acquire(GFP_KERNEL); 172 might_lock(&vma->active.mutex); 173 fs_reclaim_release(GFP_KERNEL); 174 } 175 176 INIT_LIST_HEAD(&vma->closed_link); 177 INIT_LIST_HEAD(&vma->obj_link); 178 RB_CLEAR_NODE(&vma->obj_node); 179 180 if (view && view->type != I915_GTT_VIEW_NORMAL) { 181 vma->gtt_view = *view; 182 if (view->type == I915_GTT_VIEW_PARTIAL) { 183 GEM_BUG_ON(range_overflows_t(u64, 184 view->partial.offset, 185 view->partial.size, 186 obj->base.size >> PAGE_SHIFT)); 187 vma->size = view->partial.size; 188 vma->size <<= PAGE_SHIFT; 189 GEM_BUG_ON(vma->size > obj->base.size); 190 } else if (view->type == I915_GTT_VIEW_ROTATED) { 191 vma->size = intel_rotation_info_size(&view->rotated); 192 vma->size <<= PAGE_SHIFT; 193 } else if (view->type == I915_GTT_VIEW_REMAPPED) { 194 vma->size = intel_remapped_info_size(&view->remapped); 195 vma->size <<= PAGE_SHIFT; 196 } 197 } 198 199 if (unlikely(vma->size > vm->total)) 200 goto err_vma; 201 202 GEM_BUG_ON(!IS_ALIGNED(vma->size, I915_GTT_PAGE_SIZE)); 203 204 err = mutex_lock_interruptible(&vm->mutex); 205 if (err) { 206 pos = ERR_PTR(err); 207 goto err_vma; 208 } 209 210 vma->vm = vm; 211 list_add_tail(&vma->vm_link, &vm->unbound_list); 212 213 spin_lock(&obj->vma.lock); 214 if (i915_is_ggtt(vm)) { 215 if (unlikely(overflows_type(vma->size, u32))) 216 goto err_unlock; 217 218 vma->fence_size = i915_gem_fence_size(vm->i915, vma->size, 219 i915_gem_object_get_tiling(obj), 220 i915_gem_object_get_stride(obj)); 221 if (unlikely(vma->fence_size < vma->size || /* overflow */ 222 vma->fence_size > vm->total)) 223 goto err_unlock; 224 225 GEM_BUG_ON(!IS_ALIGNED(vma->fence_size, I915_GTT_MIN_ALIGNMENT)); 226 227 vma->fence_alignment = i915_gem_fence_alignment(vm->i915, vma->size, 228 i915_gem_object_get_tiling(obj), 229 i915_gem_object_get_stride(obj)); 230 GEM_BUG_ON(!is_power_of_2(vma->fence_alignment)); 231 232 __set_bit(I915_VMA_GGTT_BIT, __i915_vma_flags(vma)); 233 } 234 235 rb = NULL; 236 p = &obj->vma.tree.rb_node; 237 while (*p) { 238 long cmp; 239 240 rb = *p; 241 pos = rb_entry(rb, struct i915_vma, obj_node); 242 243 /* 244 * If the view already exists in the tree, another thread 245 * already created a matching vma, so return the older instance 246 * and dispose of ours. 247 */ 248 cmp = i915_vma_compare(pos, vm, view); 249 if (cmp < 0) 250 p = &rb->rb_right; 251 else if (cmp > 0) 252 p = &rb->rb_left; 253 else 254 goto err_unlock; 255 } 256 rb_link_node(&vma->obj_node, rb, p); 257 rb_insert_color(&vma->obj_node, &obj->vma.tree); 258 259 if (i915_vma_is_ggtt(vma)) 260 /* 261 * We put the GGTT vma at the start of the vma-list, followed 262 * by the ppGGTT vma. This allows us to break early when 263 * iterating over only the GGTT vma for an object, see 264 * for_each_ggtt_vma() 265 */ 266 list_add(&vma->obj_link, &obj->vma.list); 267 else 268 list_add_tail(&vma->obj_link, &obj->vma.list); 269 270 spin_unlock(&obj->vma.lock); 271 mutex_unlock(&vm->mutex); 272 273 return vma; 274 275err_unlock: 276 spin_unlock(&obj->vma.lock); 277 list_del_init(&vma->vm_link); 278 mutex_unlock(&vm->mutex); 279err_vma: 280 i915_vma_free(vma); 281 return pos; 282} 283 284static struct i915_vma * 285i915_vma_lookup(struct drm_i915_gem_object *obj, 286 struct i915_address_space *vm, 287 const struct i915_gtt_view *view) 288{ 289 struct rb_node *rb; 290 291 rb = obj->vma.tree.rb_node; 292 while (rb) { 293 struct i915_vma *vma = rb_entry(rb, struct i915_vma, obj_node); 294 long cmp; 295 296 cmp = i915_vma_compare(vma, vm, view); 297 if (cmp == 0) 298 return vma; 299 300 if (cmp < 0) 301 rb = rb->rb_right; 302 else 303 rb = rb->rb_left; 304 } 305 306 return NULL; 307} 308 309/** 310 * i915_vma_instance - return the singleton instance of the VMA 311 * @obj: parent &struct drm_i915_gem_object to be mapped 312 * @vm: address space in which the mapping is located 313 * @view: additional mapping requirements 314 * 315 * i915_vma_instance() looks up an existing VMA of the @obj in the @vm with 316 * the same @view characteristics. If a match is not found, one is created. 317 * Once created, the VMA is kept until either the object is freed, or the 318 * address space is closed. 319 * 320 * Returns the vma, or an error pointer. 321 */ 322struct i915_vma * 323i915_vma_instance(struct drm_i915_gem_object *obj, 324 struct i915_address_space *vm, 325 const struct i915_gtt_view *view) 326{ 327 struct i915_vma *vma; 328 329 GEM_BUG_ON(view && !i915_is_ggtt_or_dpt(vm)); 330 GEM_BUG_ON(!kref_read(&vm->ref)); 331 332 spin_lock(&obj->vma.lock); 333 vma = i915_vma_lookup(obj, vm, view); 334 spin_unlock(&obj->vma.lock); 335 336 /* vma_create() will resolve the race if another creates the vma */ 337 if (unlikely(!vma)) 338 vma = vma_create(obj, vm, view); 339 340 GEM_BUG_ON(!IS_ERR(vma) && i915_vma_compare(vma, vm, view)); 341 return vma; 342} 343 344struct i915_vma_work { 345 struct dma_fence_work base; 346 struct i915_address_space *vm; 347 struct i915_vm_pt_stash stash; 348 struct i915_vma_resource *vma_res; 349 struct drm_i915_gem_object *obj; 350 struct i915_sw_dma_fence_cb cb; 351 unsigned int pat_index; 352 unsigned int flags; 353}; 354 355static void __vma_bind(struct dma_fence_work *work) 356{ 357 struct i915_vma_work *vw = container_of(work, typeof(*vw), base); 358 struct i915_vma_resource *vma_res = vw->vma_res; 359 360 /* 361 * We are about the bind the object, which must mean we have already 362 * signaled the work to potentially clear/move the pages underneath. If 363 * something went wrong at that stage then the object should have 364 * unknown_state set, in which case we need to skip the bind. 365 */ 366 if (i915_gem_object_has_unknown_state(vw->obj)) 367 return; 368 369 vma_res->ops->bind_vma(vma_res->vm, &vw->stash, 370 vma_res, vw->pat_index, vw->flags); 371} 372 373static void __vma_release(struct dma_fence_work *work) 374{ 375 struct i915_vma_work *vw = container_of(work, typeof(*vw), base); 376 377 if (vw->obj) 378 i915_gem_object_put(vw->obj); 379 380 i915_vm_free_pt_stash(vw->vm, &vw->stash); 381 if (vw->vma_res) 382 i915_vma_resource_put(vw->vma_res); 383} 384 385static const struct dma_fence_work_ops bind_ops = { 386 .name = "bind", 387 .work = __vma_bind, 388 .release = __vma_release, 389}; 390 391struct i915_vma_work *i915_vma_work(void) 392{ 393 struct i915_vma_work *vw; 394 395 vw = kzalloc(sizeof(*vw), GFP_KERNEL); 396 if (!vw) 397 return NULL; 398 399 dma_fence_work_init(&vw->base, &bind_ops); 400 vw->base.dma.error = -EAGAIN; /* disable the worker by default */ 401 402 return vw; 403} 404 405int i915_vma_wait_for_bind(struct i915_vma *vma) 406{ 407 int err = 0; 408 409 if (rcu_access_pointer(vma->active.excl.fence)) { 410 struct dma_fence *fence; 411 412 rcu_read_lock(); 413 fence = dma_fence_get_rcu_safe(&vma->active.excl.fence); 414 rcu_read_unlock(); 415 if (fence) { 416 err = dma_fence_wait(fence, true); 417 dma_fence_put(fence); 418 } 419 } 420 421 return err; 422} 423 424#if IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM) 425static int i915_vma_verify_bind_complete(struct i915_vma *vma) 426{ 427 struct dma_fence *fence = i915_active_fence_get(&vma->active.excl); 428 int err; 429 430 if (!fence) 431 return 0; 432 433 if (dma_fence_is_signaled(fence)) 434 err = fence->error; 435 else 436 err = -EBUSY; 437 438 dma_fence_put(fence); 439 440 return err; 441} 442#else 443#define i915_vma_verify_bind_complete(_vma) 0 444#endif 445 446I915_SELFTEST_EXPORT void 447i915_vma_resource_init_from_vma(struct i915_vma_resource *vma_res, 448 struct i915_vma *vma) 449{ 450 struct drm_i915_gem_object *obj = vma->obj; 451 452 i915_vma_resource_init(vma_res, vma->vm, vma->pages, &vma->page_sizes, 453 obj->mm.rsgt, i915_gem_object_is_readonly(obj), 454 i915_gem_object_is_lmem(obj), obj->mm.region, 455 vma->ops, vma->private, __i915_vma_offset(vma), 456 __i915_vma_size(vma), vma->size, vma->guard); 457} 458 459/** 460 * i915_vma_bind - Sets up PTEs for an VMA in it's corresponding address space. 461 * @vma: VMA to map 462 * @pat_index: PAT index to set in PTE 463 * @flags: flags like global or local mapping 464 * @work: preallocated worker for allocating and binding the PTE 465 * @vma_res: pointer to a preallocated vma resource. The resource is either 466 * consumed or freed. 467 * 468 * DMA addresses are taken from the scatter-gather table of this object (or of 469 * this VMA in case of non-default GGTT views) and PTE entries set up. 470 * Note that DMA addresses are also the only part of the SG table we care about. 471 */ 472int i915_vma_bind(struct i915_vma *vma, 473 unsigned int pat_index, 474 u32 flags, 475 struct i915_vma_work *work, 476 struct i915_vma_resource *vma_res) 477{ 478 u32 bind_flags; 479 u32 vma_flags; 480 int ret; 481 482 lockdep_assert_held(&vma->vm->mutex); 483 GEM_BUG_ON(!drm_mm_node_allocated(&vma->node)); 484 GEM_BUG_ON(vma->size > i915_vma_size(vma)); 485 486 if (GEM_DEBUG_WARN_ON(range_overflows(vma->node.start, 487 vma->node.size, 488 vma->vm->total))) { 489 i915_vma_resource_free(vma_res); 490 return -ENODEV; 491 } 492 493 if (GEM_DEBUG_WARN_ON(!flags)) { 494 i915_vma_resource_free(vma_res); 495 return -EINVAL; 496 } 497 498 bind_flags = flags; 499 bind_flags &= I915_VMA_GLOBAL_BIND | I915_VMA_LOCAL_BIND; 500 501 vma_flags = atomic_read(&vma->flags); 502 vma_flags &= I915_VMA_GLOBAL_BIND | I915_VMA_LOCAL_BIND; 503 504 bind_flags &= ~vma_flags; 505 if (bind_flags == 0) { 506 i915_vma_resource_free(vma_res); 507 return 0; 508 } 509 510 GEM_BUG_ON(!atomic_read(&vma->pages_count)); 511 512 /* Wait for or await async unbinds touching our range */ 513 if (work && bind_flags & vma->vm->bind_async_flags) 514 ret = i915_vma_resource_bind_dep_await(vma->vm, 515 &work->base.chain, 516 vma->node.start, 517 vma->node.size, 518 true, 519 GFP_NOWAIT | 520 __GFP_RETRY_MAYFAIL | 521 __GFP_NOWARN); 522 else 523 ret = i915_vma_resource_bind_dep_sync(vma->vm, vma->node.start, 524 vma->node.size, true); 525 if (ret) { 526 i915_vma_resource_free(vma_res); 527 return ret; 528 } 529 530 if (vma->resource || !vma_res) { 531 /* Rebinding with an additional I915_VMA_*_BIND */ 532 GEM_WARN_ON(!vma_flags); 533 i915_vma_resource_free(vma_res); 534 } else { 535 i915_vma_resource_init_from_vma(vma_res, vma); 536 vma->resource = vma_res; 537 } 538 trace_i915_vma_bind(vma, bind_flags); 539 if (work && bind_flags & vma->vm->bind_async_flags) { 540 struct dma_fence *prev; 541 542 work->vma_res = i915_vma_resource_get(vma->resource); 543 work->pat_index = pat_index; 544 work->flags = bind_flags; 545 546 /* 547 * Note we only want to chain up to the migration fence on 548 * the pages (not the object itself). As we don't track that, 549 * yet, we have to use the exclusive fence instead. 550 * 551 * Also note that we do not want to track the async vma as 552 * part of the obj->resv->excl_fence as it only affects 553 * execution and not content or object's backing store lifetime. 554 */ 555 prev = i915_active_set_exclusive(&vma->active, &work->base.dma); 556 if (prev) { 557 __i915_sw_fence_await_dma_fence(&work->base.chain, 558 prev, 559 &work->cb); 560 dma_fence_put(prev); 561 } 562 563 work->base.dma.error = 0; /* enable the queue_work() */ 564 work->obj = i915_gem_object_get(vma->obj); 565 } else { 566 ret = i915_gem_object_wait_moving_fence(vma->obj, true); 567 if (ret) { 568 i915_vma_resource_free(vma->resource); 569 vma->resource = NULL; 570 571 return ret; 572 } 573 vma->ops->bind_vma(vma->vm, NULL, vma->resource, pat_index, 574 bind_flags); 575 } 576 577 atomic_or(bind_flags, &vma->flags); 578 return 0; 579} 580 581void __iomem *i915_vma_pin_iomap(struct i915_vma *vma) 582{ 583 void __iomem *ptr; 584 int err; 585 586 if (WARN_ON_ONCE(vma->obj->flags & I915_BO_ALLOC_GPU_ONLY)) 587 return IOMEM_ERR_PTR(-EINVAL); 588 589 GEM_BUG_ON(!i915_vma_is_ggtt(vma)); 590 GEM_BUG_ON(!i915_vma_is_bound(vma, I915_VMA_GLOBAL_BIND)); 591 GEM_BUG_ON(i915_vma_verify_bind_complete(vma)); 592 593 ptr = READ_ONCE(vma->iomap); 594 if (ptr == NULL) { 595 /* 596 * TODO: consider just using i915_gem_object_pin_map() for lmem 597 * instead, which already supports mapping non-contiguous chunks 598 * of pages, that way we can also drop the 599 * I915_BO_ALLOC_CONTIGUOUS when allocating the object. 600 */ 601 if (i915_gem_object_is_lmem(vma->obj)) { 602 ptr = i915_gem_object_lmem_io_map(vma->obj, 0, 603 vma->obj->base.size); 604 } else if (i915_vma_is_map_and_fenceable(vma)) { 605 ptr = io_mapping_map_wc(&i915_vm_to_ggtt(vma->vm)->iomap, 606 i915_vma_offset(vma), 607 i915_vma_size(vma)); 608 } else { 609 ptr = (void __iomem *) 610 i915_gem_object_pin_map(vma->obj, I915_MAP_WC); 611 if (IS_ERR(ptr)) { 612 err = PTR_ERR(ptr); 613 goto err; 614 } 615 ptr = page_pack_bits(ptr, 1); 616 } 617 618 if (ptr == NULL) { 619 err = -ENOMEM; 620 goto err; 621 } 622 623 if (unlikely(cmpxchg(&vma->iomap, NULL, ptr))) { 624 if (page_unmask_bits(ptr)) 625 __i915_gem_object_release_map(vma->obj); 626 else 627 io_mapping_unmap(ptr); 628 ptr = vma->iomap; 629 } 630 } 631 632 __i915_vma_pin(vma); 633 634 err = i915_vma_pin_fence(vma); 635 if (err) 636 goto err_unpin; 637 638 i915_vma_set_ggtt_write(vma); 639 640 /* NB Access through the GTT requires the device to be awake. */ 641 return page_mask_bits(ptr); 642 643err_unpin: 644 __i915_vma_unpin(vma); 645err: 646 return IOMEM_ERR_PTR(err); 647} 648 649void i915_vma_flush_writes(struct i915_vma *vma) 650{ 651 if (i915_vma_unset_ggtt_write(vma)) 652 intel_gt_flush_ggtt_writes(vma->vm->gt); 653} 654 655void i915_vma_unpin_iomap(struct i915_vma *vma) 656{ 657 GEM_BUG_ON(vma->iomap == NULL); 658 659 /* XXX We keep the mapping until __i915_vma_unbind()/evict() */ 660 661 i915_vma_flush_writes(vma); 662 663 i915_vma_unpin_fence(vma); 664 i915_vma_unpin(vma); 665} 666 667void i915_vma_unpin_and_release(struct i915_vma **p_vma, unsigned int flags) 668{ 669 struct i915_vma *vma; 670 struct drm_i915_gem_object *obj; 671 672 vma = fetch_and_zero(p_vma); 673 if (!vma) 674 return; 675 676 obj = vma->obj; 677 GEM_BUG_ON(!obj); 678 679 i915_vma_unpin(vma); 680 681 if (flags & I915_VMA_RELEASE_MAP) 682 i915_gem_object_unpin_map(obj); 683 684 i915_gem_object_put(obj); 685} 686 687bool i915_vma_misplaced(const struct i915_vma *vma, 688 u64 size, u64 alignment, u64 flags) 689{ 690 if (!drm_mm_node_allocated(&vma->node)) 691 return false; 692 693 if (test_bit(I915_VMA_ERROR_BIT, __i915_vma_flags(vma))) 694 return true; 695 696 if (i915_vma_size(vma) < size) 697 return true; 698 699 GEM_BUG_ON(alignment && !is_power_of_2(alignment)); 700 if (alignment && !IS_ALIGNED(i915_vma_offset(vma), alignment)) 701 return true; 702 703 if (flags & PIN_MAPPABLE && !i915_vma_is_map_and_fenceable(vma)) 704 return true; 705 706 if (flags & PIN_OFFSET_BIAS && 707 i915_vma_offset(vma) < (flags & PIN_OFFSET_MASK)) 708 return true; 709 710 if (flags & PIN_OFFSET_FIXED && 711 i915_vma_offset(vma) != (flags & PIN_OFFSET_MASK)) 712 return true; 713 714 if (flags & PIN_OFFSET_GUARD && 715 vma->guard < (flags & PIN_OFFSET_MASK)) 716 return true; 717 718 return false; 719} 720 721void __i915_vma_set_map_and_fenceable(struct i915_vma *vma) 722{ 723 bool mappable, fenceable; 724 725 GEM_BUG_ON(!i915_vma_is_ggtt(vma)); 726 GEM_BUG_ON(!vma->fence_size); 727 728 fenceable = (i915_vma_size(vma) >= vma->fence_size && 729 IS_ALIGNED(i915_vma_offset(vma), vma->fence_alignment)); 730 731 mappable = i915_ggtt_offset(vma) + vma->fence_size <= 732 i915_vm_to_ggtt(vma->vm)->mappable_end; 733 734 if (mappable && fenceable) 735 set_bit(I915_VMA_CAN_FENCE_BIT, __i915_vma_flags(vma)); 736 else 737 clear_bit(I915_VMA_CAN_FENCE_BIT, __i915_vma_flags(vma)); 738} 739 740bool i915_gem_valid_gtt_space(struct i915_vma *vma, unsigned long color) 741{ 742 struct drm_mm_node *node = &vma->node; 743 struct drm_mm_node *other; 744 745 /* 746 * On some machines we have to be careful when putting differing types 747 * of snoopable memory together to avoid the prefetcher crossing memory 748 * domains and dying. During vm initialisation, we decide whether or not 749 * these constraints apply and set the drm_mm.color_adjust 750 * appropriately. 751 */ 752 if (!i915_vm_has_cache_coloring(vma->vm)) 753 return true; 754 755 /* Only valid to be called on an already inserted vma */ 756 GEM_BUG_ON(!drm_mm_node_allocated(node)); 757 GEM_BUG_ON(list_empty(&node->node_list)); 758 759 other = list_prev_entry(node, node_list); 760 if (i915_node_color_differs(other, color) && 761 !drm_mm_hole_follows(other)) 762 return false; 763 764 other = list_next_entry(node, node_list); 765 if (i915_node_color_differs(other, color) && 766 !drm_mm_hole_follows(node)) 767 return false; 768 769 return true; 770} 771 772/** 773 * i915_vma_insert - finds a slot for the vma in its address space 774 * @vma: the vma 775 * @ww: An optional struct i915_gem_ww_ctx 776 * @size: requested size in bytes (can be larger than the VMA) 777 * @alignment: required alignment 778 * @flags: mask of PIN_* flags to use 779 * 780 * First we try to allocate some free space that meets the requirements for 781 * the VMA. Failiing that, if the flags permit, it will evict an old VMA, 782 * preferrably the oldest idle entry to make room for the new VMA. 783 * 784 * Returns: 785 * 0 on success, negative error code otherwise. 786 */ 787static int 788i915_vma_insert(struct i915_vma *vma, struct i915_gem_ww_ctx *ww, 789 u64 size, u64 alignment, u64 flags) 790{ 791 unsigned long color, guard; 792 u64 start, end; 793 int ret; 794 795 GEM_BUG_ON(i915_vma_is_bound(vma, I915_VMA_GLOBAL_BIND | I915_VMA_LOCAL_BIND)); 796 GEM_BUG_ON(drm_mm_node_allocated(&vma->node)); 797 GEM_BUG_ON(hweight64(flags & (PIN_OFFSET_GUARD | PIN_OFFSET_FIXED | PIN_OFFSET_BIAS)) > 1); 798 799 size = max(size, vma->size); 800 alignment = max_t(typeof(alignment), alignment, vma->display_alignment); 801 if (flags & PIN_MAPPABLE) { 802 size = max_t(typeof(size), size, vma->fence_size); 803 alignment = max_t(typeof(alignment), 804 alignment, vma->fence_alignment); 805 } 806 807 GEM_BUG_ON(!IS_ALIGNED(size, I915_GTT_PAGE_SIZE)); 808 GEM_BUG_ON(!IS_ALIGNED(alignment, I915_GTT_MIN_ALIGNMENT)); 809 GEM_BUG_ON(!is_power_of_2(alignment)); 810 811 guard = vma->guard; /* retain guard across rebinds */ 812 if (flags & PIN_OFFSET_GUARD) { 813 GEM_BUG_ON(overflows_type(flags & PIN_OFFSET_MASK, u32)); 814 guard = max_t(u32, guard, flags & PIN_OFFSET_MASK); 815 } 816 /* 817 * As we align the node upon insertion, but the hardware gets 818 * node.start + guard, the easiest way to make that work is 819 * to make the guard a multiple of the alignment size. 820 */ 821 guard = ALIGN(guard, alignment); 822 823 start = flags & PIN_OFFSET_BIAS ? flags & PIN_OFFSET_MASK : 0; 824 GEM_BUG_ON(!IS_ALIGNED(start, I915_GTT_PAGE_SIZE)); 825 826 end = vma->vm->total; 827 if (flags & PIN_MAPPABLE) 828 end = min_t(u64, end, i915_vm_to_ggtt(vma->vm)->mappable_end); 829 if (flags & PIN_ZONE_4G) 830 end = min_t(u64, end, (1ULL << 32) - I915_GTT_PAGE_SIZE); 831 GEM_BUG_ON(!IS_ALIGNED(end, I915_GTT_PAGE_SIZE)); 832 833 alignment = max(alignment, i915_vm_obj_min_alignment(vma->vm, vma->obj)); 834 835 /* 836 * If binding the object/GGTT view requires more space than the entire 837 * aperture has, reject it early before evicting everything in a vain 838 * attempt to find space. 839 */ 840 if (size > end - 2 * guard) { 841 drm_dbg(vma->obj->base.dev, 842 "Attempting to bind an object larger than the aperture: request=%llu > %s aperture=%llu\n", 843 size, flags & PIN_MAPPABLE ? "mappable" : "total", end); 844 return -ENOSPC; 845 } 846 847 color = 0; 848 849 if (i915_vm_has_cache_coloring(vma->vm)) 850 color = vma->obj->pat_index; 851 852 if (flags & PIN_OFFSET_FIXED) { 853 u64 offset = flags & PIN_OFFSET_MASK; 854 if (!IS_ALIGNED(offset, alignment) || 855 range_overflows(offset, size, end)) 856 return -EINVAL; 857 /* 858 * The caller knows not of the guard added by others and 859 * requests for the offset of the start of its buffer 860 * to be fixed, which may not be the same as the position 861 * of the vma->node due to the guard pages. 862 */ 863 if (offset < guard || offset + size > end - guard) 864 return -ENOSPC; 865 866 ret = i915_gem_gtt_reserve(vma->vm, ww, &vma->node, 867 size + 2 * guard, 868 offset - guard, 869 color, flags); 870 if (ret) 871 return ret; 872 } else { 873 size += 2 * guard; 874 /* 875 * We only support huge gtt pages through the 48b PPGTT, 876 * however we also don't want to force any alignment for 877 * objects which need to be tightly packed into the low 32bits. 878 * 879 * Note that we assume that GGTT are limited to 4GiB for the 880 * forseeable future. See also i915_ggtt_offset(). 881 */ 882 if (upper_32_bits(end - 1) && 883 vma->page_sizes.sg > I915_GTT_PAGE_SIZE && 884 !HAS_64K_PAGES(vma->vm->i915)) { 885 /* 886 * We can't mix 64K and 4K PTEs in the same page-table 887 * (2M block), and so to avoid the ugliness and 888 * complexity of coloring we opt for just aligning 64K 889 * objects to 2M. 890 */ 891 u64 page_alignment = 892 rounddown_pow_of_two(vma->page_sizes.sg | 893 I915_GTT_PAGE_SIZE_2M); 894 895 /* 896 * Check we don't expand for the limited Global GTT 897 * (mappable aperture is even more precious!). This 898 * also checks that we exclude the aliasing-ppgtt. 899 */ 900 GEM_BUG_ON(i915_vma_is_ggtt(vma)); 901 902 alignment = max(alignment, page_alignment); 903 904 if (vma->page_sizes.sg & I915_GTT_PAGE_SIZE_64K) 905 size = round_up(size, I915_GTT_PAGE_SIZE_2M); 906 } 907 908 ret = i915_gem_gtt_insert(vma->vm, ww, &vma->node, 909 size, alignment, color, 910 start, end, flags); 911 if (ret) 912 return ret; 913 914 GEM_BUG_ON(vma->node.start < start); 915 GEM_BUG_ON(vma->node.start + vma->node.size > end); 916 } 917 GEM_BUG_ON(!drm_mm_node_allocated(&vma->node)); 918 GEM_BUG_ON(!i915_gem_valid_gtt_space(vma, color)); 919 920 list_move_tail(&vma->vm_link, &vma->vm->bound_list); 921 vma->guard = guard; 922 923 return 0; 924} 925 926static void 927i915_vma_detach(struct i915_vma *vma) 928{ 929 GEM_BUG_ON(!drm_mm_node_allocated(&vma->node)); 930 GEM_BUG_ON(i915_vma_is_bound(vma, I915_VMA_GLOBAL_BIND | I915_VMA_LOCAL_BIND)); 931 932 /* 933 * And finally now the object is completely decoupled from this 934 * vma, we can drop its hold on the backing storage and allow 935 * it to be reaped by the shrinker. 936 */ 937 list_move_tail(&vma->vm_link, &vma->vm->unbound_list); 938} 939 940static bool try_qad_pin(struct i915_vma *vma, unsigned int flags) 941{ 942 unsigned int bound; 943 944 bound = atomic_read(&vma->flags); 945 946 if (flags & PIN_VALIDATE) { 947 flags &= I915_VMA_BIND_MASK; 948 949 return (flags & bound) == flags; 950 } 951 952 /* with the lock mandatory for unbind, we don't race here */ 953 flags &= I915_VMA_BIND_MASK; 954 do { 955 if (unlikely(flags & ~bound)) 956 return false; 957 958 if (unlikely(bound & (I915_VMA_OVERFLOW | I915_VMA_ERROR))) 959 return false; 960 961 GEM_BUG_ON(((bound + 1) & I915_VMA_PIN_MASK) == 0); 962 } while (!atomic_try_cmpxchg(&vma->flags, &bound, bound + 1)); 963 964 return true; 965} 966 967static struct scatterlist * 968rotate_pages(struct drm_i915_gem_object *obj, unsigned int offset, 969 unsigned int width, unsigned int height, 970 unsigned int src_stride, unsigned int dst_stride, 971 struct sg_table *st, struct scatterlist *sg) 972{ 973 unsigned int column, row; 974 pgoff_t src_idx; 975 976 for (column = 0; column < width; column++) { 977 unsigned int left; 978 979 src_idx = src_stride * (height - 1) + column + offset; 980 for (row = 0; row < height; row++) { 981 st->nents++; 982 /* 983 * We don't need the pages, but need to initialize 984 * the entries so the sg list can be happily traversed. 985 * The only thing we need are DMA addresses. 986 */ 987 sg_set_page(sg, NULL, I915_GTT_PAGE_SIZE, 0); 988 sg_dma_address(sg) = 989 i915_gem_object_get_dma_address(obj, src_idx); 990 sg_dma_len(sg) = I915_GTT_PAGE_SIZE; 991 sg = sg_next(sg); 992 src_idx -= src_stride; 993 } 994 995 left = (dst_stride - height) * I915_GTT_PAGE_SIZE; 996 997 if (!left) 998 continue; 999 1000 st->nents++; 1001 1002 /* 1003 * The DE ignores the PTEs for the padding tiles, the sg entry 1004 * here is just a conenience to indicate how many padding PTEs 1005 * to insert at this spot. 1006 */ 1007 sg_set_page(sg, NULL, left, 0); 1008 sg_dma_address(sg) = 0; 1009 sg_dma_len(sg) = left; 1010 sg = sg_next(sg); 1011 } 1012 1013 return sg; 1014} 1015 1016static noinline struct sg_table * 1017intel_rotate_pages(struct intel_rotation_info *rot_info, 1018 struct drm_i915_gem_object *obj) 1019{ 1020 unsigned int size = intel_rotation_info_size(rot_info); 1021 struct drm_i915_private *i915 = to_i915(obj->base.dev); 1022 struct sg_table *st; 1023 struct scatterlist *sg; 1024 int ret = -ENOMEM; 1025 int i; 1026 1027 /* Allocate target SG list. */ 1028 st = kmalloc(sizeof(*st), GFP_KERNEL); 1029 if (!st) 1030 goto err_st_alloc; 1031 1032 ret = sg_alloc_table(st, size, GFP_KERNEL); 1033 if (ret) 1034 goto err_sg_alloc; 1035 1036 st->nents = 0; 1037 sg = st->sgl; 1038 1039 for (i = 0 ; i < ARRAY_SIZE(rot_info->plane); i++) 1040 sg = rotate_pages(obj, rot_info->plane[i].offset, 1041 rot_info->plane[i].width, rot_info->plane[i].height, 1042 rot_info->plane[i].src_stride, 1043 rot_info->plane[i].dst_stride, 1044 st, sg); 1045 1046 return st; 1047 1048err_sg_alloc: 1049 kfree(st); 1050err_st_alloc: 1051 1052 drm_dbg(&i915->drm, "Failed to create rotated mapping for object size %zu! (%ux%u tiles, %u pages)\n", 1053 obj->base.size, rot_info->plane[0].width, 1054 rot_info->plane[0].height, size); 1055 1056 return ERR_PTR(ret); 1057} 1058 1059static struct scatterlist * 1060add_padding_pages(unsigned int count, 1061 struct sg_table *st, struct scatterlist *sg) 1062{ 1063 st->nents++; 1064 1065 /* 1066 * The DE ignores the PTEs for the padding tiles, the sg entry 1067 * here is just a convenience to indicate how many padding PTEs 1068 * to insert at this spot. 1069 */ 1070 sg_set_page(sg, NULL, count * I915_GTT_PAGE_SIZE, 0); 1071 sg_dma_address(sg) = 0; 1072 sg_dma_len(sg) = count * I915_GTT_PAGE_SIZE; 1073 sg = sg_next(sg); 1074 1075 return sg; 1076} 1077 1078static struct scatterlist * 1079remap_tiled_color_plane_pages(struct drm_i915_gem_object *obj, 1080 unsigned long offset, unsigned int alignment_pad, 1081 unsigned int width, unsigned int height, 1082 unsigned int src_stride, unsigned int dst_stride, 1083 struct sg_table *st, struct scatterlist *sg, 1084 unsigned int *gtt_offset) 1085{ 1086 unsigned int row; 1087 1088 if (!width || !height) 1089 return sg; 1090 1091 if (alignment_pad) 1092 sg = add_padding_pages(alignment_pad, st, sg); 1093 1094 for (row = 0; row < height; row++) { 1095 unsigned int left = width * I915_GTT_PAGE_SIZE; 1096 1097 while (left) { 1098 dma_addr_t addr; 1099 unsigned int length; 1100 1101 /* 1102 * We don't need the pages, but need to initialize 1103 * the entries so the sg list can be happily traversed. 1104 * The only thing we need are DMA addresses. 1105 */ 1106 1107 addr = i915_gem_object_get_dma_address_len(obj, offset, &length); 1108 1109 length = min(left, length); 1110 1111 st->nents++; 1112 1113 sg_set_page(sg, NULL, length, 0); 1114 sg_dma_address(sg) = addr; 1115 sg_dma_len(sg) = length; 1116 sg = sg_next(sg); 1117 1118 offset += length / I915_GTT_PAGE_SIZE; 1119 left -= length; 1120 } 1121 1122 offset += src_stride - width; 1123 1124 left = (dst_stride - width) * I915_GTT_PAGE_SIZE; 1125 1126 if (!left) 1127 continue; 1128 1129 sg = add_padding_pages(left >> PAGE_SHIFT, st, sg); 1130 } 1131 1132 *gtt_offset += alignment_pad + dst_stride * height; 1133 1134 return sg; 1135} 1136 1137static struct scatterlist * 1138remap_contiguous_pages(struct drm_i915_gem_object *obj, 1139 pgoff_t obj_offset, 1140 unsigned int count, 1141 struct sg_table *st, struct scatterlist *sg) 1142{ 1143 struct scatterlist *iter; 1144 unsigned int offset; 1145 1146 iter = i915_gem_object_get_sg_dma(obj, obj_offset, &offset); 1147 GEM_BUG_ON(!iter); 1148 1149 do { 1150 unsigned int len; 1151 1152 len = min(sg_dma_len(iter) - (offset << PAGE_SHIFT), 1153 count << PAGE_SHIFT); 1154 sg_set_page(sg, NULL, len, 0); 1155 sg_dma_address(sg) = 1156 sg_dma_address(iter) + (offset << PAGE_SHIFT); 1157 sg_dma_len(sg) = len; 1158 1159 st->nents++; 1160 count -= len >> PAGE_SHIFT; 1161 if (count == 0) 1162 return sg; 1163 1164 sg = __sg_next(sg); 1165 iter = __sg_next(iter); 1166 offset = 0; 1167 } while (1); 1168} 1169 1170static struct scatterlist * 1171remap_linear_color_plane_pages(struct drm_i915_gem_object *obj, 1172 pgoff_t obj_offset, unsigned int alignment_pad, 1173 unsigned int size, 1174 struct sg_table *st, struct scatterlist *sg, 1175 unsigned int *gtt_offset) 1176{ 1177 if (!size) 1178 return sg; 1179 1180 if (alignment_pad) 1181 sg = add_padding_pages(alignment_pad, st, sg); 1182 1183 sg = remap_contiguous_pages(obj, obj_offset, size, st, sg); 1184 sg = sg_next(sg); 1185 1186 *gtt_offset += alignment_pad + size; 1187 1188 return sg; 1189} 1190 1191static struct scatterlist * 1192remap_color_plane_pages(const struct intel_remapped_info *rem_info, 1193 struct drm_i915_gem_object *obj, 1194 int color_plane, 1195 struct sg_table *st, struct scatterlist *sg, 1196 unsigned int *gtt_offset) 1197{ 1198 unsigned int alignment_pad = 0; 1199 1200 if (rem_info->plane_alignment) 1201 alignment_pad = ALIGN(*gtt_offset, rem_info->plane_alignment) - *gtt_offset; 1202 1203 if (rem_info->plane[color_plane].linear) 1204 sg = remap_linear_color_plane_pages(obj, 1205 rem_info->plane[color_plane].offset, 1206 alignment_pad, 1207 rem_info->plane[color_plane].size, 1208 st, sg, 1209 gtt_offset); 1210 1211 else 1212 sg = remap_tiled_color_plane_pages(obj, 1213 rem_info->plane[color_plane].offset, 1214 alignment_pad, 1215 rem_info->plane[color_plane].width, 1216 rem_info->plane[color_plane].height, 1217 rem_info->plane[color_plane].src_stride, 1218 rem_info->plane[color_plane].dst_stride, 1219 st, sg, 1220 gtt_offset); 1221 1222 return sg; 1223} 1224 1225static noinline struct sg_table * 1226intel_remap_pages(struct intel_remapped_info *rem_info, 1227 struct drm_i915_gem_object *obj) 1228{ 1229 unsigned int size = intel_remapped_info_size(rem_info); 1230 struct drm_i915_private *i915 = to_i915(obj->base.dev); 1231 struct sg_table *st; 1232 struct scatterlist *sg; 1233 unsigned int gtt_offset = 0; 1234 int ret = -ENOMEM; 1235 int i; 1236 1237 /* Allocate target SG list. */ 1238 st = kmalloc(sizeof(*st), GFP_KERNEL); 1239 if (!st) 1240 goto err_st_alloc; 1241 1242 ret = sg_alloc_table(st, size, GFP_KERNEL); 1243 if (ret) 1244 goto err_sg_alloc; 1245 1246 st->nents = 0; 1247 sg = st->sgl; 1248 1249 for (i = 0 ; i < ARRAY_SIZE(rem_info->plane); i++) 1250 sg = remap_color_plane_pages(rem_info, obj, i, st, sg, >t_offset); 1251 1252 i915_sg_trim(st); 1253 1254 return st; 1255 1256err_sg_alloc: 1257 kfree(st); 1258err_st_alloc: 1259 1260 drm_dbg(&i915->drm, "Failed to create remapped mapping for object size %zu! (%ux%u tiles, %u pages)\n", 1261 obj->base.size, rem_info->plane[0].width, 1262 rem_info->plane[0].height, size); 1263 1264 return ERR_PTR(ret); 1265} 1266 1267static noinline struct sg_table * 1268intel_partial_pages(const struct i915_gtt_view *view, 1269 struct drm_i915_gem_object *obj) 1270{ 1271 struct sg_table *st; 1272 struct scatterlist *sg; 1273 unsigned int count = view->partial.size; 1274 int ret = -ENOMEM; 1275 1276 st = kmalloc(sizeof(*st), GFP_KERNEL); 1277 if (!st) 1278 goto err_st_alloc; 1279 1280 ret = sg_alloc_table(st, count, GFP_KERNEL); 1281 if (ret) 1282 goto err_sg_alloc; 1283 1284 st->nents = 0; 1285 1286 sg = remap_contiguous_pages(obj, view->partial.offset, count, st, st->sgl); 1287 1288 sg_mark_end(sg); 1289 i915_sg_trim(st); /* Drop any unused tail entries. */ 1290 1291 return st; 1292 1293err_sg_alloc: 1294 kfree(st); 1295err_st_alloc: 1296 return ERR_PTR(ret); 1297} 1298 1299static int 1300__i915_vma_get_pages(struct i915_vma *vma) 1301{ 1302 struct sg_table *pages; 1303 1304 /* 1305 * The vma->pages are only valid within the lifespan of the borrowed 1306 * obj->mm.pages. When the obj->mm.pages sg_table is regenerated, so 1307 * must be the vma->pages. A simple rule is that vma->pages must only 1308 * be accessed when the obj->mm.pages are pinned. 1309 */ 1310 GEM_BUG_ON(!i915_gem_object_has_pinned_pages(vma->obj)); 1311 1312 switch (vma->gtt_view.type) { 1313 default: 1314 GEM_BUG_ON(vma->gtt_view.type); 1315 fallthrough; 1316 case I915_GTT_VIEW_NORMAL: 1317 pages = vma->obj->mm.pages; 1318 break; 1319 1320 case I915_GTT_VIEW_ROTATED: 1321 pages = 1322 intel_rotate_pages(&vma->gtt_view.rotated, vma->obj); 1323 break; 1324 1325 case I915_GTT_VIEW_REMAPPED: 1326 pages = 1327 intel_remap_pages(&vma->gtt_view.remapped, vma->obj); 1328 break; 1329 1330 case I915_GTT_VIEW_PARTIAL: 1331 pages = intel_partial_pages(&vma->gtt_view, vma->obj); 1332 break; 1333 } 1334 1335 if (IS_ERR(pages)) { 1336 drm_err(&vma->vm->i915->drm, 1337 "Failed to get pages for VMA view type %u (%ld)!\n", 1338 vma->gtt_view.type, PTR_ERR(pages)); 1339 return PTR_ERR(pages); 1340 } 1341 1342 vma->pages = pages; 1343 1344 return 0; 1345} 1346 1347I915_SELFTEST_EXPORT int i915_vma_get_pages(struct i915_vma *vma) 1348{ 1349 int err; 1350 1351 if (atomic_add_unless(&vma->pages_count, 1, 0)) 1352 return 0; 1353 1354 err = i915_gem_object_pin_pages(vma->obj); 1355 if (err) 1356 return err; 1357 1358 err = __i915_vma_get_pages(vma); 1359 if (err) 1360 goto err_unpin; 1361 1362 vma->page_sizes = vma->obj->mm.page_sizes; 1363 atomic_inc(&vma->pages_count); 1364 1365 return 0; 1366 1367err_unpin: 1368 __i915_gem_object_unpin_pages(vma->obj); 1369 1370 return err; 1371} 1372 1373void vma_invalidate_tlb(struct i915_address_space *vm, u32 *tlb) 1374{ 1375 struct intel_gt *gt; 1376 int id; 1377 1378 if (!tlb) 1379 return; 1380 1381 /* 1382 * Before we release the pages that were bound by this vma, we 1383 * must invalidate all the TLBs that may still have a reference 1384 * back to our physical address. It only needs to be done once, 1385 * so after updating the PTE to point away from the pages, record 1386 * the most recent TLB invalidation seqno, and if we have not yet 1387 * flushed the TLBs upon release, perform a full invalidation. 1388 */ 1389 for_each_gt(gt, vm->i915, id) 1390 WRITE_ONCE(tlb[id], 1391 intel_gt_next_invalidate_tlb_full(gt)); 1392} 1393 1394static void __vma_put_pages(struct i915_vma *vma, unsigned int count) 1395{ 1396 /* We allocate under vma_get_pages, so beware the shrinker */ 1397 GEM_BUG_ON(atomic_read(&vma->pages_count) < count); 1398 1399 if (atomic_sub_return(count, &vma->pages_count) == 0) { 1400 if (vma->pages != vma->obj->mm.pages) { 1401 sg_free_table(vma->pages); 1402 kfree(vma->pages); 1403 } 1404 vma->pages = NULL; 1405 1406 i915_gem_object_unpin_pages(vma->obj); 1407 } 1408} 1409 1410I915_SELFTEST_EXPORT void i915_vma_put_pages(struct i915_vma *vma) 1411{ 1412 if (atomic_add_unless(&vma->pages_count, -1, 1)) 1413 return; 1414 1415 __vma_put_pages(vma, 1); 1416} 1417 1418static void vma_unbind_pages(struct i915_vma *vma) 1419{ 1420 unsigned int count; 1421 1422 lockdep_assert_held(&vma->vm->mutex); 1423 1424 /* The upper portion of pages_count is the number of bindings */ 1425 count = atomic_read(&vma->pages_count); 1426 count >>= I915_VMA_PAGES_BIAS; 1427 GEM_BUG_ON(!count); 1428 1429 __vma_put_pages(vma, count | count << I915_VMA_PAGES_BIAS); 1430} 1431 1432int i915_vma_pin_ww(struct i915_vma *vma, struct i915_gem_ww_ctx *ww, 1433 u64 size, u64 alignment, u64 flags) 1434{ 1435 struct i915_vma_work *work = NULL; 1436 struct dma_fence *moving = NULL; 1437 struct i915_vma_resource *vma_res = NULL; 1438 intel_wakeref_t wakeref; 1439 unsigned int bound; 1440 int err; 1441 1442 assert_vma_held(vma); 1443 GEM_BUG_ON(!ww); 1444 1445 BUILD_BUG_ON(PIN_GLOBAL != I915_VMA_GLOBAL_BIND); 1446 BUILD_BUG_ON(PIN_USER != I915_VMA_LOCAL_BIND); 1447 1448 GEM_BUG_ON(!(flags & (PIN_USER | PIN_GLOBAL))); 1449 1450 /* First try and grab the pin without rebinding the vma */ 1451 if (try_qad_pin(vma, flags)) 1452 return 0; 1453 1454 err = i915_vma_get_pages(vma); 1455 if (err) 1456 return err; 1457 1458 /* 1459 * In case of a global GTT, we must hold a runtime-pm wakeref 1460 * while global PTEs are updated. In other cases, we hold 1461 * the rpm reference while the VMA is active. Since runtime 1462 * resume may require allocations, which are forbidden inside 1463 * vm->mutex, get the first rpm wakeref outside of the mutex. 1464 */ 1465 wakeref = intel_runtime_pm_get(&vma->vm->i915->runtime_pm); 1466 1467 if (flags & vma->vm->bind_async_flags) { 1468 /* lock VM */ 1469 err = i915_vm_lock_objects(vma->vm, ww); 1470 if (err) 1471 goto err_rpm; 1472 1473 work = i915_vma_work(); 1474 if (!work) { 1475 err = -ENOMEM; 1476 goto err_rpm; 1477 } 1478 1479 work->vm = vma->vm; 1480 1481 err = i915_gem_object_get_moving_fence(vma->obj, &moving); 1482 if (err) 1483 goto err_rpm; 1484 1485 dma_fence_work_chain(&work->base, moving); 1486 1487 /* Allocate enough page directories to used PTE */ 1488 if (vma->vm->allocate_va_range) { 1489 err = i915_vm_alloc_pt_stash(vma->vm, 1490 &work->stash, 1491 vma->size); 1492 if (err) 1493 goto err_fence; 1494 1495 err = i915_vm_map_pt_stash(vma->vm, &work->stash); 1496 if (err) 1497 goto err_fence; 1498 } 1499 } 1500 1501 vma_res = i915_vma_resource_alloc(); 1502 if (IS_ERR(vma_res)) { 1503 err = PTR_ERR(vma_res); 1504 goto err_fence; 1505 } 1506 1507 /* 1508 * Differentiate between user/kernel vma inside the aliasing-ppgtt. 1509 * 1510 * We conflate the Global GTT with the user's vma when using the 1511 * aliasing-ppgtt, but it is still vitally important to try and 1512 * keep the use cases distinct. For example, userptr objects are 1513 * not allowed inside the Global GTT as that will cause lock 1514 * inversions when we have to evict them the mmu_notifier callbacks - 1515 * but they are allowed to be part of the user ppGTT which can never 1516 * be mapped. As such we try to give the distinct users of the same 1517 * mutex, distinct lockclasses [equivalent to how we keep i915_ggtt 1518 * and i915_ppgtt separate]. 1519 * 1520 * NB this may cause us to mask real lock inversions -- while the 1521 * code is safe today, lockdep may not be able to spot future 1522 * transgressions. 1523 */ 1524 err = mutex_lock_interruptible_nested(&vma->vm->mutex, 1525 !(flags & PIN_GLOBAL)); 1526 if (err) 1527 goto err_vma_res; 1528 1529 /* No more allocations allowed now we hold vm->mutex */ 1530 1531 if (unlikely(i915_vma_is_closed(vma))) { 1532 err = -ENOENT; 1533 goto err_unlock; 1534 } 1535 1536 bound = atomic_read(&vma->flags); 1537 if (unlikely(bound & I915_VMA_ERROR)) { 1538 err = -ENOMEM; 1539 goto err_unlock; 1540 } 1541 1542 if (unlikely(!((bound + 1) & I915_VMA_PIN_MASK))) { 1543 err = -EAGAIN; /* pins are meant to be fairly temporary */ 1544 goto err_unlock; 1545 } 1546 1547 if (unlikely(!(flags & ~bound & I915_VMA_BIND_MASK))) { 1548 if (!(flags & PIN_VALIDATE)) 1549 __i915_vma_pin(vma); 1550 goto err_unlock; 1551 } 1552 1553 err = i915_active_acquire(&vma->active); 1554 if (err) 1555 goto err_unlock; 1556 1557 if (!(bound & I915_VMA_BIND_MASK)) { 1558 err = i915_vma_insert(vma, ww, size, alignment, flags); 1559 if (err) 1560 goto err_active; 1561 1562 if (i915_is_ggtt(vma->vm)) 1563 __i915_vma_set_map_and_fenceable(vma); 1564 } 1565 1566 GEM_BUG_ON(!vma->pages); 1567 err = i915_vma_bind(vma, 1568 vma->obj->pat_index, 1569 flags, work, vma_res); 1570 vma_res = NULL; 1571 if (err) 1572 goto err_remove; 1573 1574 /* There should only be at most 2 active bindings (user, global) */ 1575 GEM_BUG_ON(bound + I915_VMA_PAGES_ACTIVE < bound); 1576 atomic_add(I915_VMA_PAGES_ACTIVE, &vma->pages_count); 1577 list_move_tail(&vma->vm_link, &vma->vm->bound_list); 1578 1579 if (!(flags & PIN_VALIDATE)) { 1580 __i915_vma_pin(vma); 1581 GEM_BUG_ON(!i915_vma_is_pinned(vma)); 1582 } 1583 GEM_BUG_ON(!i915_vma_is_bound(vma, flags)); 1584 GEM_BUG_ON(i915_vma_misplaced(vma, size, alignment, flags)); 1585 1586err_remove: 1587 if (!i915_vma_is_bound(vma, I915_VMA_BIND_MASK)) { 1588 i915_vma_detach(vma); 1589 drm_mm_remove_node(&vma->node); 1590 } 1591err_active: 1592 i915_active_release(&vma->active); 1593err_unlock: 1594 mutex_unlock(&vma->vm->mutex); 1595err_vma_res: 1596 i915_vma_resource_free(vma_res); 1597err_fence: 1598 if (work) 1599 dma_fence_work_commit_imm(&work->base); 1600err_rpm: 1601 intel_runtime_pm_put(&vma->vm->i915->runtime_pm, wakeref); 1602 1603 if (moving) 1604 dma_fence_put(moving); 1605 1606 i915_vma_put_pages(vma); 1607 return err; 1608} 1609 1610static void flush_idle_contexts(struct intel_gt *gt) 1611{ 1612 struct intel_engine_cs *engine; 1613 enum intel_engine_id id; 1614 1615 for_each_engine(engine, gt, id) 1616 intel_engine_flush_barriers(engine); 1617 1618 intel_gt_wait_for_idle(gt, MAX_SCHEDULE_TIMEOUT); 1619} 1620 1621static int __i915_ggtt_pin(struct i915_vma *vma, struct i915_gem_ww_ctx *ww, 1622 u32 align, unsigned int flags) 1623{ 1624 struct i915_address_space *vm = vma->vm; 1625 struct intel_gt *gt; 1626 struct i915_ggtt *ggtt = i915_vm_to_ggtt(vm); 1627 int err; 1628 1629 do { 1630 err = i915_vma_pin_ww(vma, ww, 0, align, flags | PIN_GLOBAL); 1631 1632 if (err != -ENOSPC) { 1633 if (!err) { 1634 err = i915_vma_wait_for_bind(vma); 1635 if (err) 1636 i915_vma_unpin(vma); 1637 } 1638 return err; 1639 } 1640 1641 /* Unlike i915_vma_pin, we don't take no for an answer! */ 1642 list_for_each_entry(gt, &ggtt->gt_list, ggtt_link) 1643 flush_idle_contexts(gt); 1644 if (mutex_lock_interruptible(&vm->mutex) == 0) { 1645 /* 1646 * We pass NULL ww here, as we don't want to unbind 1647 * locked objects when called from execbuf when pinning 1648 * is removed. This would probably regress badly. 1649 */ 1650 i915_gem_evict_vm(vm, NULL, NULL); 1651 mutex_unlock(&vm->mutex); 1652 } 1653 } while (1); 1654} 1655 1656int i915_ggtt_pin(struct i915_vma *vma, struct i915_gem_ww_ctx *ww, 1657 u32 align, unsigned int flags) 1658{ 1659 struct i915_gem_ww_ctx _ww; 1660 int err; 1661 1662 GEM_BUG_ON(!i915_vma_is_ggtt(vma)); 1663 1664 if (ww) 1665 return __i915_ggtt_pin(vma, ww, align, flags); 1666 1667 lockdep_assert_not_held(&vma->obj->base.resv->lock.base); 1668 1669 for_i915_gem_ww(&_ww, err, true) { 1670 err = i915_gem_object_lock(vma->obj, &_ww); 1671 if (!err) 1672 err = __i915_ggtt_pin(vma, &_ww, align, flags); 1673 } 1674 1675 return err; 1676} 1677 1678/** 1679 * i915_ggtt_clear_scanout - Clear scanout flag for all objects ggtt vmas 1680 * @obj: i915 GEM object 1681 * This function clears scanout flags for objects ggtt vmas. These flags are set 1682 * when object is pinned for display use and this function to clear them all is 1683 * targeted to be called by frontbuffer tracking code when the frontbuffer is 1684 * about to be released. 1685 */ 1686void i915_ggtt_clear_scanout(struct drm_i915_gem_object *obj) 1687{ 1688 struct i915_vma *vma; 1689 1690 spin_lock(&obj->vma.lock); 1691 for_each_ggtt_vma(vma, obj) { 1692 i915_vma_clear_scanout(vma); 1693 vma->display_alignment = I915_GTT_MIN_ALIGNMENT; 1694 } 1695 spin_unlock(&obj->vma.lock); 1696} 1697 1698static void __vma_close(struct i915_vma *vma, struct intel_gt *gt) 1699{ 1700 /* 1701 * We defer actually closing, unbinding and destroying the VMA until 1702 * the next idle point, or if the object is freed in the meantime. By 1703 * postponing the unbind, we allow for it to be resurrected by the 1704 * client, avoiding the work required to rebind the VMA. This is 1705 * advantageous for DRI, where the client/server pass objects 1706 * between themselves, temporarily opening a local VMA to the 1707 * object, and then closing it again. The same object is then reused 1708 * on the next frame (or two, depending on the depth of the swap queue) 1709 * causing us to rebind the VMA once more. This ends up being a lot 1710 * of wasted work for the steady state. 1711 */ 1712 GEM_BUG_ON(i915_vma_is_closed(vma)); 1713 list_add(&vma->closed_link, >->closed_vma); 1714} 1715 1716void i915_vma_close(struct i915_vma *vma) 1717{ 1718 struct intel_gt *gt = vma->vm->gt; 1719 unsigned long flags; 1720 1721 if (i915_vma_is_ggtt(vma)) 1722 return; 1723 1724 GEM_BUG_ON(!atomic_read(&vma->open_count)); 1725 if (atomic_dec_and_lock_irqsave(&vma->open_count, 1726 >->closed_lock, 1727 flags)) { 1728 __vma_close(vma, gt); 1729 spin_unlock_irqrestore(>->closed_lock, flags); 1730 } 1731} 1732 1733static void __i915_vma_remove_closed(struct i915_vma *vma) 1734{ 1735 list_del_init(&vma->closed_link); 1736} 1737 1738void i915_vma_reopen(struct i915_vma *vma) 1739{ 1740 struct intel_gt *gt = vma->vm->gt; 1741 1742 spin_lock_irq(>->closed_lock); 1743 if (i915_vma_is_closed(vma)) 1744 __i915_vma_remove_closed(vma); 1745 spin_unlock_irq(>->closed_lock); 1746} 1747 1748static void force_unbind(struct i915_vma *vma) 1749{ 1750 if (!drm_mm_node_allocated(&vma->node)) 1751 return; 1752 1753 atomic_and(~I915_VMA_PIN_MASK, &vma->flags); 1754 WARN_ON(__i915_vma_unbind(vma)); 1755 GEM_BUG_ON(drm_mm_node_allocated(&vma->node)); 1756} 1757 1758static void release_references(struct i915_vma *vma, struct intel_gt *gt, 1759 bool vm_ddestroy) 1760{ 1761 struct drm_i915_gem_object *obj = vma->obj; 1762 1763 GEM_BUG_ON(i915_vma_is_active(vma)); 1764 1765 spin_lock(&obj->vma.lock); 1766 list_del(&vma->obj_link); 1767 if (!RB_EMPTY_NODE(&vma->obj_node)) 1768 rb_erase(&vma->obj_node, &obj->vma.tree); 1769 1770 spin_unlock(&obj->vma.lock); 1771 1772 spin_lock_irq(>->closed_lock); 1773 __i915_vma_remove_closed(vma); 1774 spin_unlock_irq(>->closed_lock); 1775 1776 if (vm_ddestroy) 1777 i915_vm_resv_put(vma->vm); 1778 1779 /* Wait for async active retire */ 1780 i915_active_wait(&vma->active); 1781 i915_active_fini(&vma->active); 1782 GEM_WARN_ON(vma->resource); 1783 i915_vma_free(vma); 1784} 1785 1786/* 1787 * i915_vma_destroy_locked - Remove all weak reference to the vma and put 1788 * the initial reference. 1789 * 1790 * This function should be called when it's decided the vma isn't needed 1791 * anymore. The caller must assure that it doesn't race with another lookup 1792 * plus destroy, typically by taking an appropriate reference. 1793 * 1794 * Current callsites are 1795 * - __i915_gem_object_pages_fini() 1796 * - __i915_vm_close() - Blocks the above function by taking a reference on 1797 * the object. 1798 * - __i915_vma_parked() - Blocks the above functions by taking a reference 1799 * on the vm and a reference on the object. Also takes the object lock so 1800 * destruction from __i915_vma_parked() can be blocked by holding the 1801 * object lock. Since the object lock is only allowed from within i915 with 1802 * an object refcount, holding the object lock also implicitly blocks the 1803 * vma freeing from __i915_gem_object_pages_fini(). 1804 * 1805 * Because of locks taken during destruction, a vma is also guaranteed to 1806 * stay alive while the following locks are held if it was looked up while 1807 * holding one of the locks: 1808 * - vm->mutex 1809 * - obj->vma.lock 1810 * - gt->closed_lock 1811 */ 1812void i915_vma_destroy_locked(struct i915_vma *vma) 1813{ 1814 lockdep_assert_held(&vma->vm->mutex); 1815 1816 force_unbind(vma); 1817 list_del_init(&vma->vm_link); 1818 release_references(vma, vma->vm->gt, false); 1819} 1820 1821void i915_vma_destroy(struct i915_vma *vma) 1822{ 1823 struct intel_gt *gt; 1824 bool vm_ddestroy; 1825 1826 mutex_lock(&vma->vm->mutex); 1827 force_unbind(vma); 1828 list_del_init(&vma->vm_link); 1829 vm_ddestroy = vma->vm_ddestroy; 1830 vma->vm_ddestroy = false; 1831 1832 /* vma->vm may be freed when releasing vma->vm->mutex. */ 1833 gt = vma->vm->gt; 1834 mutex_unlock(&vma->vm->mutex); 1835 release_references(vma, gt, vm_ddestroy); 1836} 1837 1838void i915_vma_parked(struct intel_gt *gt) 1839{ 1840 struct i915_vma *vma, *next; 1841 LIST_HEAD(closed); 1842 1843 spin_lock_irq(>->closed_lock); 1844 list_for_each_entry_safe(vma, next, >->closed_vma, closed_link) { 1845 struct drm_i915_gem_object *obj = vma->obj; 1846 struct i915_address_space *vm = vma->vm; 1847 1848 /* XXX All to avoid keeping a reference on i915_vma itself */ 1849 1850 if (!kref_get_unless_zero(&obj->base.refcount)) 1851 continue; 1852 1853 if (!i915_vm_tryget(vm)) { 1854 i915_gem_object_put(obj); 1855 continue; 1856 } 1857 1858 list_move(&vma->closed_link, &closed); 1859 } 1860 spin_unlock_irq(>->closed_lock); 1861 1862 /* As the GT is held idle, no vma can be reopened as we destroy them */ 1863 list_for_each_entry_safe(vma, next, &closed, closed_link) { 1864 struct drm_i915_gem_object *obj = vma->obj; 1865 struct i915_address_space *vm = vma->vm; 1866 1867 if (i915_gem_object_trylock(obj, NULL)) { 1868 INIT_LIST_HEAD(&vma->closed_link); 1869 i915_vma_destroy(vma); 1870 i915_gem_object_unlock(obj); 1871 } else { 1872 /* back you go.. */ 1873 spin_lock_irq(>->closed_lock); 1874 list_add(&vma->closed_link, >->closed_vma); 1875 spin_unlock_irq(>->closed_lock); 1876 } 1877 1878 i915_gem_object_put(obj); 1879 i915_vm_put(vm); 1880 } 1881} 1882 1883static void __i915_vma_iounmap(struct i915_vma *vma) 1884{ 1885 GEM_BUG_ON(i915_vma_is_pinned(vma)); 1886 1887 if (vma->iomap == NULL) 1888 return; 1889 1890 if (page_unmask_bits(vma->iomap)) 1891 __i915_gem_object_release_map(vma->obj); 1892 else 1893 io_mapping_unmap(vma->iomap); 1894 vma->iomap = NULL; 1895} 1896 1897void i915_vma_revoke_mmap(struct i915_vma *vma) 1898{ 1899 struct drm_vma_offset_node *node; 1900 u64 vma_offset; 1901 1902 if (!i915_vma_has_userfault(vma)) 1903 return; 1904 1905 GEM_BUG_ON(!i915_vma_is_map_and_fenceable(vma)); 1906 GEM_BUG_ON(!vma->obj->userfault_count); 1907 1908 node = &vma->mmo->vma_node; 1909 vma_offset = vma->gtt_view.partial.offset << PAGE_SHIFT; 1910 unmap_mapping_range(vma->vm->i915->drm.anon_inode->i_mapping, 1911 drm_vma_node_offset_addr(node) + vma_offset, 1912 vma->size, 1913 1); 1914 1915 i915_vma_unset_userfault(vma); 1916 if (!--vma->obj->userfault_count) 1917 list_del(&vma->obj->userfault_link); 1918} 1919 1920static int 1921__i915_request_await_bind(struct i915_request *rq, struct i915_vma *vma) 1922{ 1923 return __i915_request_await_exclusive(rq, &vma->active); 1924} 1925 1926static int __i915_vma_move_to_active(struct i915_vma *vma, struct i915_request *rq) 1927{ 1928 int err; 1929 1930 /* Wait for the vma to be bound before we start! */ 1931 err = __i915_request_await_bind(rq, vma); 1932 if (err) 1933 return err; 1934 1935 return i915_active_add_request(&vma->active, rq); 1936} 1937 1938int _i915_vma_move_to_active(struct i915_vma *vma, 1939 struct i915_request *rq, 1940 struct dma_fence *fence, 1941 unsigned int flags) 1942{ 1943 struct drm_i915_gem_object *obj = vma->obj; 1944 int err; 1945 1946 assert_object_held(obj); 1947 1948 GEM_BUG_ON(!vma->pages); 1949 1950 if (!(flags & __EXEC_OBJECT_NO_REQUEST_AWAIT)) { 1951 err = i915_request_await_object(rq, vma->obj, flags & EXEC_OBJECT_WRITE); 1952 if (unlikely(err)) 1953 return err; 1954 } 1955 err = __i915_vma_move_to_active(vma, rq); 1956 if (unlikely(err)) 1957 return err; 1958 1959 /* 1960 * Reserve fences slot early to prevent an allocation after preparing 1961 * the workload and associating fences with dma_resv. 1962 */ 1963 if (fence && !(flags & __EXEC_OBJECT_NO_RESERVE)) { 1964 struct dma_fence *curr; 1965 int idx; 1966 1967 dma_fence_array_for_each(curr, idx, fence) 1968 ; 1969 err = dma_resv_reserve_fences(vma->obj->base.resv, idx); 1970 if (unlikely(err)) 1971 return err; 1972 } 1973 1974 if (flags & EXEC_OBJECT_WRITE) { 1975 struct intel_frontbuffer *front; 1976 1977 front = i915_gem_object_get_frontbuffer(obj); 1978 if (unlikely(front)) { 1979 if (intel_frontbuffer_invalidate(front, ORIGIN_CS)) 1980 i915_active_add_request(&front->write, rq); 1981 intel_frontbuffer_put(front); 1982 } 1983 } 1984 1985 if (fence) { 1986 struct dma_fence *curr; 1987 enum dma_resv_usage usage; 1988 int idx; 1989 1990 if (flags & EXEC_OBJECT_WRITE) { 1991 usage = DMA_RESV_USAGE_WRITE; 1992 obj->write_domain = I915_GEM_DOMAIN_RENDER; 1993 obj->read_domains = 0; 1994 } else { 1995 usage = DMA_RESV_USAGE_READ; 1996 obj->write_domain = 0; 1997 } 1998 1999 dma_fence_array_for_each(curr, idx, fence) 2000 dma_resv_add_fence(vma->obj->base.resv, curr, usage); 2001 } 2002 2003 if (flags & EXEC_OBJECT_NEEDS_FENCE && vma->fence) 2004 i915_active_add_request(&vma->fence->active, rq); 2005 2006 obj->read_domains |= I915_GEM_GPU_DOMAINS; 2007 obj->mm.dirty = true; 2008 2009 GEM_BUG_ON(!i915_vma_is_active(vma)); 2010 return 0; 2011} 2012 2013struct dma_fence *__i915_vma_evict(struct i915_vma *vma, bool async) 2014{ 2015 struct i915_vma_resource *vma_res = vma->resource; 2016 struct dma_fence *unbind_fence; 2017 2018 GEM_BUG_ON(i915_vma_is_pinned(vma)); 2019 assert_vma_held_evict(vma); 2020 2021 if (i915_vma_is_map_and_fenceable(vma)) { 2022 /* Force a pagefault for domain tracking on next user access */ 2023 i915_vma_revoke_mmap(vma); 2024 2025 /* 2026 * Check that we have flushed all writes through the GGTT 2027 * before the unbind, other due to non-strict nature of those 2028 * indirect writes they may end up referencing the GGTT PTE 2029 * after the unbind. 2030 * 2031 * Note that we may be concurrently poking at the GGTT_WRITE 2032 * bit from set-domain, as we mark all GGTT vma associated 2033 * with an object. We know this is for another vma, as we 2034 * are currently unbinding this one -- so if this vma will be 2035 * reused, it will be refaulted and have its dirty bit set 2036 * before the next write. 2037 */ 2038 i915_vma_flush_writes(vma); 2039 2040 /* release the fence reg _after_ flushing */ 2041 i915_vma_revoke_fence(vma); 2042 2043 clear_bit(I915_VMA_CAN_FENCE_BIT, __i915_vma_flags(vma)); 2044 } 2045 2046 __i915_vma_iounmap(vma); 2047 2048 GEM_BUG_ON(vma->fence); 2049 GEM_BUG_ON(i915_vma_has_userfault(vma)); 2050 2051 /* Object backend must be async capable. */ 2052 GEM_WARN_ON(async && !vma->resource->bi.pages_rsgt); 2053 2054 /* If vm is not open, unbind is a nop. */ 2055 vma_res->needs_wakeref = i915_vma_is_bound(vma, I915_VMA_GLOBAL_BIND) && 2056 kref_read(&vma->vm->ref); 2057 vma_res->skip_pte_rewrite = !kref_read(&vma->vm->ref) || 2058 vma->vm->skip_pte_rewrite; 2059 trace_i915_vma_unbind(vma); 2060 2061 if (async) 2062 unbind_fence = i915_vma_resource_unbind(vma_res, 2063 vma->obj->mm.tlb); 2064 else 2065 unbind_fence = i915_vma_resource_unbind(vma_res, NULL); 2066 2067 vma->resource = NULL; 2068 2069 atomic_and(~(I915_VMA_BIND_MASK | I915_VMA_ERROR | I915_VMA_GGTT_WRITE), 2070 &vma->flags); 2071 2072 i915_vma_detach(vma); 2073 2074 if (!async) { 2075 if (unbind_fence) { 2076 dma_fence_wait(unbind_fence, false); 2077 dma_fence_put(unbind_fence); 2078 unbind_fence = NULL; 2079 } 2080 vma_invalidate_tlb(vma->vm, vma->obj->mm.tlb); 2081 } 2082 2083 /* 2084 * Binding itself may not have completed until the unbind fence signals, 2085 * so don't drop the pages until that happens, unless the resource is 2086 * async_capable. 2087 */ 2088 2089 vma_unbind_pages(vma); 2090 return unbind_fence; 2091} 2092 2093int __i915_vma_unbind(struct i915_vma *vma) 2094{ 2095 int ret; 2096 2097 lockdep_assert_held(&vma->vm->mutex); 2098 assert_vma_held_evict(vma); 2099 2100 if (!drm_mm_node_allocated(&vma->node)) 2101 return 0; 2102 2103 if (i915_vma_is_pinned(vma)) { 2104 vma_print_allocator(vma, "is pinned"); 2105 return -EAGAIN; 2106 } 2107 2108 /* 2109 * After confirming that no one else is pinning this vma, wait for 2110 * any laggards who may have crept in during the wait (through 2111 * a residual pin skipping the vm->mutex) to complete. 2112 */ 2113 ret = i915_vma_sync(vma); 2114 if (ret) 2115 return ret; 2116 2117 GEM_BUG_ON(i915_vma_is_active(vma)); 2118 __i915_vma_evict(vma, false); 2119 2120 drm_mm_remove_node(&vma->node); /* pairs with i915_vma_release() */ 2121 return 0; 2122} 2123 2124static struct dma_fence *__i915_vma_unbind_async(struct i915_vma *vma) 2125{ 2126 struct dma_fence *fence; 2127 2128 lockdep_assert_held(&vma->vm->mutex); 2129 2130 if (!drm_mm_node_allocated(&vma->node)) 2131 return NULL; 2132 2133 if (i915_vma_is_pinned(vma) || 2134 &vma->obj->mm.rsgt->table != vma->resource->bi.pages) 2135 return ERR_PTR(-EAGAIN); 2136 2137 /* 2138 * We probably need to replace this with awaiting the fences of the 2139 * object's dma_resv when the vma active goes away. When doing that 2140 * we need to be careful to not add the vma_resource unbind fence 2141 * immediately to the object's dma_resv, because then unbinding 2142 * the next vma from the object, in case there are many, will 2143 * actually await the unbinding of the previous vmas, which is 2144 * undesirable. 2145 */ 2146 if (i915_sw_fence_await_active(&vma->resource->chain, &vma->active, 2147 I915_ACTIVE_AWAIT_EXCL | 2148 I915_ACTIVE_AWAIT_ACTIVE) < 0) { 2149 return ERR_PTR(-EBUSY); 2150 } 2151 2152 fence = __i915_vma_evict(vma, true); 2153 2154 drm_mm_remove_node(&vma->node); /* pairs with i915_vma_release() */ 2155 2156 return fence; 2157} 2158 2159int i915_vma_unbind(struct i915_vma *vma) 2160{ 2161 struct i915_address_space *vm = vma->vm; 2162 intel_wakeref_t wakeref = 0; 2163 int err; 2164 2165 assert_object_held_shared(vma->obj); 2166 2167 /* Optimistic wait before taking the mutex */ 2168 err = i915_vma_sync(vma); 2169 if (err) 2170 return err; 2171 2172 if (!drm_mm_node_allocated(&vma->node)) 2173 return 0; 2174 2175 if (i915_vma_is_pinned(vma)) { 2176 vma_print_allocator(vma, "is pinned"); 2177 return -EAGAIN; 2178 } 2179 2180 if (i915_vma_is_bound(vma, I915_VMA_GLOBAL_BIND)) 2181 /* XXX not always required: nop_clear_range */ 2182 wakeref = intel_runtime_pm_get(&vm->i915->runtime_pm); 2183 2184 err = mutex_lock_interruptible_nested(&vma->vm->mutex, !wakeref); 2185 if (err) 2186 goto out_rpm; 2187 2188 err = __i915_vma_unbind(vma); 2189 mutex_unlock(&vm->mutex); 2190 2191out_rpm: 2192 if (wakeref) 2193 intel_runtime_pm_put(&vm->i915->runtime_pm, wakeref); 2194 return err; 2195} 2196 2197int i915_vma_unbind_async(struct i915_vma *vma, bool trylock_vm) 2198{ 2199 struct drm_i915_gem_object *obj = vma->obj; 2200 struct i915_address_space *vm = vma->vm; 2201 intel_wakeref_t wakeref = 0; 2202 struct dma_fence *fence; 2203 int err; 2204 2205 /* 2206 * We need the dma-resv lock since we add the 2207 * unbind fence to the dma-resv object. 2208 */ 2209 assert_object_held(obj); 2210 2211 if (!drm_mm_node_allocated(&vma->node)) 2212 return 0; 2213 2214 if (i915_vma_is_pinned(vma)) { 2215 vma_print_allocator(vma, "is pinned"); 2216 return -EAGAIN; 2217 } 2218 2219 if (!obj->mm.rsgt) 2220 return -EBUSY; 2221 2222 err = dma_resv_reserve_fences(obj->base.resv, 2); 2223 if (err) 2224 return -EBUSY; 2225 2226 /* 2227 * It would be great if we could grab this wakeref from the 2228 * async unbind work if needed, but we can't because it uses 2229 * kmalloc and it's in the dma-fence signalling critical path. 2230 */ 2231 if (i915_vma_is_bound(vma, I915_VMA_GLOBAL_BIND)) 2232 wakeref = intel_runtime_pm_get(&vm->i915->runtime_pm); 2233 2234 if (trylock_vm && !mutex_trylock(&vm->mutex)) { 2235 err = -EBUSY; 2236 goto out_rpm; 2237 } else if (!trylock_vm) { 2238 err = mutex_lock_interruptible_nested(&vm->mutex, !wakeref); 2239 if (err) 2240 goto out_rpm; 2241 } 2242 2243 fence = __i915_vma_unbind_async(vma); 2244 mutex_unlock(&vm->mutex); 2245 if (IS_ERR_OR_NULL(fence)) { 2246 err = PTR_ERR_OR_ZERO(fence); 2247 goto out_rpm; 2248 } 2249 2250 dma_resv_add_fence(obj->base.resv, fence, DMA_RESV_USAGE_READ); 2251 dma_fence_put(fence); 2252 2253out_rpm: 2254 if (wakeref) 2255 intel_runtime_pm_put(&vm->i915->runtime_pm, wakeref); 2256 return err; 2257} 2258 2259int i915_vma_unbind_unlocked(struct i915_vma *vma) 2260{ 2261 int err; 2262 2263 i915_gem_object_lock(vma->obj, NULL); 2264 err = i915_vma_unbind(vma); 2265 i915_gem_object_unlock(vma->obj); 2266 2267 return err; 2268} 2269 2270struct i915_vma *i915_vma_make_unshrinkable(struct i915_vma *vma) 2271{ 2272 i915_gem_object_make_unshrinkable(vma->obj); 2273 return vma; 2274} 2275 2276void i915_vma_make_shrinkable(struct i915_vma *vma) 2277{ 2278 i915_gem_object_make_shrinkable(vma->obj); 2279} 2280 2281void i915_vma_make_purgeable(struct i915_vma *vma) 2282{ 2283 i915_gem_object_make_purgeable(vma->obj); 2284} 2285 2286#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST) 2287#include "selftests/i915_vma.c" 2288#endif 2289 2290void i915_vma_module_exit(void) 2291{ 2292 kmem_cache_destroy(slab_vmas); 2293} 2294 2295int __init i915_vma_module_init(void) 2296{ 2297 slab_vmas = KMEM_CACHE(i915_vma, SLAB_HWCACHE_ALIGN); 2298 if (!slab_vmas) 2299 return -ENOMEM; 2300 2301 return 0; 2302} 2303