drivers/gpu/drm/i915/i915_vma.c

   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 <drm/drm_gem.h>
  27
  28 #include "display/intel_frontbuffer.h"
  29
  30 #include "gt/intel_engine.h"
  31 #include "gt/intel_engine_heartbeat.h"
  32 #include "gt/intel_gt.h"
  33 #include "gt/intel_gt_requests.h"
  34
  35 #include "i915_drv.h"
  36 #include "i915_globals.h"
  37 #include "i915_sw_fence_work.h"
  38 #include "i915_trace.h"
  39 #include "i915_vma.h"
  40
  41 static struct i915_global_vma {
  42         struct i915_global base;
  43         struct kmem_cache *slab_vmas;
  44 } global;
  45
  46 struct i915_vma *i915_vma_alloc(void)
  47 {
  48         return kmem_cache_zalloc(global.slab_vmas, GFP_KERNEL);
  49 }
  50
  51 void i915_vma_free(struct i915_vma *vma)
  52 {
  53         return kmem_cache_free(global.slab_vmas, vma);
  54 }
  55
  56 #if IS_ENABLED(CONFIG_DRM_I915_ERRLOG_GEM) && IS_ENABLED(CONFIG_DRM_DEBUG_MM)
  57
  58 #include <linux/stackdepot.h>
  59
  60 static void vma_print_allocator(struct i915_vma *vma, const char *reason)
  61 {
  62         unsigned long *entries;
  63         unsigned int nr_entries;
  64         char buf[512];
  65
  66         if (!vma->node.stack) {
  67                 DRM_DEBUG_DRIVER("vma.node [%08llx + %08llx] %s: unknown owner\n",
  68                                  vma->node.start, vma->node.size, reason);
  69                 return;
  70         }
  71
  72         nr_entries = stack_depot_fetch(vma->node.stack, &entries);
  73         stack_trace_snprint(buf, sizeof(buf), entries, nr_entries, 0);
  74         DRM_DEBUG_DRIVER("vma.node [%08llx + %08llx] %s: inserted at %s\n",
  75                          vma->node.start, vma->node.size, reason, buf);
  76 }
  77
  78 #else
  79
  80 static void vma_print_allocator(struct i915_vma *vma, const char *reason)
  81 {
  82 }
  83
  84 #endif
  85
  86 static inline struct i915_vma *active_to_vma(struct i915_active *ref)
  87 {
  88         return container_of(ref, typeof(struct i915_vma), active);
  89 }
  90
  91 static int __i915_vma_active(struct i915_active *ref)
  92 {
  93         return i915_vma_tryget(active_to_vma(ref)) ? 0 : -ENOENT;
  94 }
  95
  96 __i915_active_call
  97 static void __i915_vma_retire(struct i915_active *ref)
  98 {
  99         i915_vma_put(active_to_vma(ref));
 100 }
 101
 102 static struct i915_vma *
 103 vma_create(struct drm_i915_gem_object *obj,
 104            struct i915_address_space *vm,
 105            const struct i915_ggtt_view *view)
 106 {
 107         struct i915_vma *pos = ERR_PTR(-E2BIG);
 108         struct i915_vma *vma;
 109         struct rb_node *rb, **p;
 110
 111         /* The aliasing_ppgtt should never be used directly! */
 112         GEM_BUG_ON(vm == &vm->gt->ggtt->alias->vm);
 113
 114         vma = i915_vma_alloc();
 115         if (vma == NULL)
 116                 return ERR_PTR(-ENOMEM);
 117
 118         kref_init(&vma->ref);
 119         mutex_init(&vma->pages_mutex);
 120         vma->vm = i915_vm_get(vm);
 121         vma->ops = &vm->vma_ops;
 122         vma->obj = obj;
 123         vma->resv = obj->base.resv;
 124         vma->size = obj->base.size;
 125         vma->display_alignment = I915_GTT_MIN_ALIGNMENT;
 126
 127         i915_active_init(&vma->active, __i915_vma_active, __i915_vma_retire);
 128
 129         /* Declare ourselves safe for use inside shrinkers */
 130         if (IS_ENABLED(CONFIG_LOCKDEP)) {
 131                 fs_reclaim_acquire(GFP_KERNEL);
 132                 might_lock(&vma->active.mutex);
 133                 fs_reclaim_release(GFP_KERNEL);
 134         }
 135
 136         INIT_LIST_HEAD(&vma->closed_link);
 137
 138         if (view && view->type != I915_GGTT_VIEW_NORMAL) {
 139                 vma->ggtt_view = *view;
 140                 if (view->type == I915_GGTT_VIEW_PARTIAL) {
 141                         GEM_BUG_ON(range_overflows_t(u64,
 142                                                      view->partial.offset,
 143                                                      view->partial.size,
 144                                                      obj->base.size >> PAGE_SHIFT));
 145                         vma->size = view->partial.size;
 146                         vma->size <<= PAGE_SHIFT;
 147                         GEM_BUG_ON(vma->size > obj->base.size);
 148                 } else if (view->type == I915_GGTT_VIEW_ROTATED) {
 149                         vma->size = intel_rotation_info_size(&view->rotated);
 150                         vma->size <<= PAGE_SHIFT;
 151                 } else if (view->type == I915_GGTT_VIEW_REMAPPED) {
 152                         vma->size = intel_remapped_info_size(&view->remapped);
 153                         vma->size <<= PAGE_SHIFT;
 154                 }
 155         }
 156
 157         if (unlikely(vma->size > vm->total))
 158                 goto err_vma;
 159
 160         GEM_BUG_ON(!IS_ALIGNED(vma->size, I915_GTT_PAGE_SIZE));
 161
 162         spin_lock(&obj->vma.lock);
 163
 164         if (i915_is_ggtt(vm)) {
 165                 if (unlikely(overflows_type(vma->size, u32)))
 166                         goto err_unlock;
 167
 168                 vma->fence_size = i915_gem_fence_size(vm->i915, vma->size,
 169                                                       i915_gem_object_get_tiling(obj),
 170                                                       i915_gem_object_get_stride(obj));
 171                 if (unlikely(vma->fence_size < vma->size || /* overflow */
 172                              vma->fence_size > vm->total))
 173                         goto err_unlock;
 174
 175                 GEM_BUG_ON(!IS_ALIGNED(vma->fence_size, I915_GTT_MIN_ALIGNMENT));
 176
 177                 vma->fence_alignment = i915_gem_fence_alignment(vm->i915, vma->size,
 178                                                                 i915_gem_object_get_tiling(obj),
 179                                                                 i915_gem_object_get_stride(obj));
 180                 GEM_BUG_ON(!is_power_of_2(vma->fence_alignment));
 181
 182                 __set_bit(I915_VMA_GGTT_BIT, __i915_vma_flags(vma));
 183         }
 184
 185         rb = NULL;
 186         p = &obj->vma.tree.rb_node;
 187         while (*p) {
 188                 long cmp;
 189
 190                 rb = *p;
 191                 pos = rb_entry(rb, struct i915_vma, obj_node);
 192
 193                 /*
 194                  * If the view already exists in the tree, another thread
 195                  * already created a matching vma, so return the older instance
 196                  * and dispose of ours.
 197                  */
 198                 cmp = i915_vma_compare(pos, vm, view);
 199                 if (cmp < 0)
 200                         p = &rb->rb_right;
 201                 else if (cmp > 0)
 202                         p = &rb->rb_left;
 203                 else
 204                         goto err_unlock;
 205         }
 206         rb_link_node(&vma->obj_node, rb, p);
 207         rb_insert_color(&vma->obj_node, &obj->vma.tree);
 208
 209         if (i915_vma_is_ggtt(vma))
 210                 /*
 211                  * We put the GGTT vma at the start of the vma-list, followed
 212                  * by the ppGGTT vma. This allows us to break early when
 213                  * iterating over only the GGTT vma for an object, see
 214                  * for_each_ggtt_vma()
 215                  */
 216                 list_add(&vma->obj_link, &obj->vma.list);
 217         else
 218                 list_add_tail(&vma->obj_link, &obj->vma.list);
 219
 220         spin_unlock(&obj->vma.lock);
 221
 222         return vma;
 223
 224 err_unlock:
 225         spin_unlock(&obj->vma.lock);
 226 err_vma:
 227         i915_vm_put(vm);
 228         i915_vma_free(vma);
 229         return pos;
 230 }
 231
 232 static struct i915_vma *
 233 vma_lookup(struct drm_i915_gem_object *obj,
 234            struct i915_address_space *vm,
 235            const struct i915_ggtt_view *view)
 236 {
 237         struct rb_node *rb;
 238
 239         rb = obj->vma.tree.rb_node;
 240         while (rb) {
 241                 struct i915_vma *vma = rb_entry(rb, struct i915_vma, obj_node);
 242                 long cmp;
 243
 244                 cmp = i915_vma_compare(vma, vm, view);
 245                 if (cmp == 0)
 246                         return vma;
 247
 248                 if (cmp < 0)
 249                         rb = rb->rb_right;
 250                 else
 251                         rb = rb->rb_left;
 252         }
 253
 254         return NULL;
 255 }
 256
 257 /**
 258  * i915_vma_instance - return the singleton instance of the VMA
 259  * @obj: parent &struct drm_i915_gem_object to be mapped
 260  * @vm: address space in which the mapping is located
 261  * @view: additional mapping requirements
 262  *
 263  * i915_vma_instance() looks up an existing VMA of the @obj in the @vm with
 264  * the same @view characteristics. If a match is not found, one is created.
 265  * Once created, the VMA is kept until either the object is freed, or the
 266  * address space is closed.
 267  *
 268  * Returns the vma, or an error pointer.
 269  */
 270 struct i915_vma *
 271 i915_vma_instance(struct drm_i915_gem_object *obj,
 272                   struct i915_address_space *vm,
 273                   const struct i915_ggtt_view *view)
 274 {
 275         struct i915_vma *vma;
 276
 277         GEM_BUG_ON(view && !i915_is_ggtt(vm));
 278         GEM_BUG_ON(!atomic_read(&vm->open));
 279
 280         spin_lock(&obj->vma.lock);
 281         vma = vma_lookup(obj, vm, view);
 282         spin_unlock(&obj->vma.lock);
 283
 284         /* vma_create() will resolve the race if another creates the vma */
 285         if (unlikely(!vma))
 286                 vma = vma_create(obj, vm, view);
 287
 288         GEM_BUG_ON(!IS_ERR(vma) && i915_vma_compare(vma, vm, view));
 289         return vma;
 290 }
 291
 292 struct i915_vma_work {
 293         struct dma_fence_work base;
 294         struct i915_vma *vma;
 295         struct drm_i915_gem_object *pinned;
 296         struct i915_sw_dma_fence_cb cb;
 297         enum i915_cache_level cache_level;
 298         unsigned int flags;
 299 };
 300
 301 static int __vma_bind(struct dma_fence_work *work)
 302 {
 303         struct i915_vma_work *vw = container_of(work, typeof(*vw), base);
 304         struct i915_vma *vma = vw->vma;
 305         int err;
 306
 307         err = vma->ops->bind_vma(vma->vm, vma, vw->cache_level, vw->flags);
 308         if (err)
 309                 atomic_or(I915_VMA_ERROR, &vma->flags);
 310
 311         return err;
 312 }
 313
 314 static void __vma_release(struct dma_fence_work *work)
 315 {
 316         struct i915_vma_work *vw = container_of(work, typeof(*vw), base);
 317
 318         if (vw->pinned)
 319                 __i915_gem_object_unpin_pages(vw->pinned);
 320 }
 321
 322 static const struct dma_fence_work_ops bind_ops = {
 323         .name = "bind",
 324         .work = __vma_bind,
 325         .release = __vma_release,
 326 };
 327
 328 struct i915_vma_work *i915_vma_work(void)
 329 {
 330         struct i915_vma_work *vw;
 331
 332         vw = kzalloc(sizeof(*vw), GFP_KERNEL);
 333         if (!vw)
 334                 return NULL;
 335
 336         dma_fence_work_init(&vw->base, &bind_ops);
 337         vw->base.dma.error = -EAGAIN; /* disable the worker by default */
 338
 339         return vw;
 340 }
 341
 342 int i915_vma_wait_for_bind(struct i915_vma *vma)
 343 {
 344         int err = 0;
 345
 346         if (rcu_access_pointer(vma->active.excl.fence)) {
 347                 struct dma_fence *fence;
 348
 349                 rcu_read_lock();
 350                 fence = dma_fence_get_rcu_safe(&vma->active.excl.fence);
 351                 rcu_read_unlock();
 352                 if (fence) {
 353                         err = dma_fence_wait(fence, MAX_SCHEDULE_TIMEOUT);
 354                         dma_fence_put(fence);
 355                 }
 356         }
 357
 358         return err;
 359 }
 360
 361 /**
 362  * i915_vma_bind - Sets up PTEs for an VMA in it's corresponding address space.
 363  * @vma: VMA to map
 364  * @cache_level: mapping cache level
 365  * @flags: flags like global or local mapping
 366  * @work: preallocated worker for allocating and binding the PTE
 367  *
 368  * DMA addresses are taken from the scatter-gather table of this object (or of
 369  * this VMA in case of non-default GGTT views) and PTE entries set up.
 370  * Note that DMA addresses are also the only part of the SG table we care about.
 371  */
 372 int i915_vma_bind(struct i915_vma *vma,
 373                   enum i915_cache_level cache_level,
 374                   u32 flags,
 375                   struct i915_vma_work *work)
 376 {
 377         u32 bind_flags;
 378         u32 vma_flags;
 379         int ret;
 380
 381         GEM_BUG_ON(!drm_mm_node_allocated(&vma->node));
 382         GEM_BUG_ON(vma->size > vma->node.size);
 383
 384         if (GEM_DEBUG_WARN_ON(range_overflows(vma->node.start,
 385                                               vma->node.size,
 386                                               vma->vm->total)))
 387                 return -ENODEV;
 388
 389         if (GEM_DEBUG_WARN_ON(!flags))
 390                 return -EINVAL;
 391
 392         bind_flags = flags;
 393         bind_flags &= I915_VMA_GLOBAL_BIND | I915_VMA_LOCAL_BIND;
 394
 395         vma_flags = atomic_read(&vma->flags);
 396         vma_flags &= I915_VMA_GLOBAL_BIND | I915_VMA_LOCAL_BIND;
 397
 398         bind_flags &= ~vma_flags;
 399         if (bind_flags == 0)
 400                 return 0;
 401
 402         GEM_BUG_ON(!vma->pages);
 403
 404         trace_i915_vma_bind(vma, bind_flags);
 405         if (work && bind_flags & vma->vm->bind_async_flags) {
 406                 struct dma_fence *prev;
 407
 408                 work->vma = vma;
 409                 work->cache_level = cache_level;
 410                 work->flags = bind_flags;
 411
 412                 /*
 413                  * Note we only want to chain up to the migration fence on
 414                  * the pages (not the object itself). As we don't track that,
 415                  * yet, we have to use the exclusive fence instead.
 416                  *
 417                  * Also note that we do not want to track the async vma as
 418                  * part of the obj->resv->excl_fence as it only affects
 419                  * execution and not content or object's backing store lifetime.
 420                  */
 421                 prev = i915_active_set_exclusive(&vma->active, &work->base.dma);
 422                 if (prev) {
 423                         __i915_sw_fence_await_dma_fence(&work->base.chain,
 424                                                         prev,
 425                                                         &work->cb);
 426                         dma_fence_put(prev);
 427                 }
 428
 429                 work->base.dma.error = 0; /* enable the queue_work() */
 430
 431                 if (vma->obj) {
 432                         __i915_gem_object_pin_pages(vma->obj);
 433                         work->pinned = vma->obj;
 434                 }
 435         } else {
 436                 ret = vma->ops->bind_vma(vma->vm, vma, cache_level, bind_flags);
 437                 if (ret)
 438                         return ret;
 439         }
 440
 441         atomic_or(bind_flags, &vma->flags);
 442         return 0;
 443 }
 444
 445 void __iomem *i915_vma_pin_iomap(struct i915_vma *vma)
 446 {
 447         void __iomem *ptr;
 448         int err;
 449
 450         if (GEM_WARN_ON(!i915_vma_is_map_and_fenceable(vma))) {
 451                 err = -ENODEV;
 452                 goto err;
 453         }
 454
 455         GEM_BUG_ON(!i915_vma_is_ggtt(vma));
 456         GEM_BUG_ON(!i915_vma_is_bound(vma, I915_VMA_GLOBAL_BIND));
 457
 458         ptr = READ_ONCE(vma->iomap);
 459         if (ptr == NULL) {
 460                 ptr = io_mapping_map_wc(&i915_vm_to_ggtt(vma->vm)->iomap,
 461                                         vma->node.start,
 462                                         vma->node.size);
 463                 if (ptr == NULL) {
 464                         err = -ENOMEM;
 465                         goto err;
 466                 }
 467
 468                 if (unlikely(cmpxchg(&vma->iomap, NULL, ptr))) {
 469                         io_mapping_unmap(ptr);
 470                         ptr = vma->iomap;
 471                 }
 472         }
 473
 474         __i915_vma_pin(vma);
 475
 476         err = i915_vma_pin_fence(vma);
 477         if (err)
 478                 goto err_unpin;
 479
 480         i915_vma_set_ggtt_write(vma);
 481
 482         /* NB Access through the GTT requires the device to be awake. */
 483         return ptr;
 484
 485 err_unpin:
 486         __i915_vma_unpin(vma);
 487 err:
 488         return IO_ERR_PTR(err);
 489 }
 490
 491 void i915_vma_flush_writes(struct i915_vma *vma)
 492 {
 493         if (i915_vma_unset_ggtt_write(vma))
 494                 intel_gt_flush_ggtt_writes(vma->vm->gt);
 495 }
 496
 497 void i915_vma_unpin_iomap(struct i915_vma *vma)
 498 {
 499         GEM_BUG_ON(vma->iomap == NULL);
 500
 501         i915_vma_flush_writes(vma);
 502
 503         i915_vma_unpin_fence(vma);
 504         i915_vma_unpin(vma);
 505 }
 506
 507 void i915_vma_unpin_and_release(struct i915_vma **p_vma, unsigned int flags)
 508 {
 509         struct i915_vma *vma;
 510         struct drm_i915_gem_object *obj;
 511
 512         vma = fetch_and_zero(p_vma);
 513         if (!vma)
 514                 return;
 515
 516         obj = vma->obj;
 517         GEM_BUG_ON(!obj);
 518
 519         i915_vma_unpin(vma);
 520
 521         if (flags & I915_VMA_RELEASE_MAP)
 522                 i915_gem_object_unpin_map(obj);
 523
 524         i915_gem_object_put(obj);
 525 }
 526
 527 bool i915_vma_misplaced(const struct i915_vma *vma,
 528                         u64 size, u64 alignment, u64 flags)
 529 {
 530         if (!drm_mm_node_allocated(&vma->node))
 531                 return false;
 532
 533         if (test_bit(I915_VMA_ERROR_BIT, __i915_vma_flags(vma)))
 534                 return true;
 535
 536         if (vma->node.size < size)
 537                 return true;
 538
 539         GEM_BUG_ON(alignment && !is_power_of_2(alignment));
 540         if (alignment && !IS_ALIGNED(vma->node.start, alignment))
 541                 return true;
 542
 543         if (flags & PIN_MAPPABLE && !i915_vma_is_map_and_fenceable(vma))
 544                 return true;
 545
 546         if (flags & PIN_OFFSET_BIAS &&
 547             vma->node.start < (flags & PIN_OFFSET_MASK))
 548                 return true;
 549
 550         if (flags & PIN_OFFSET_FIXED &&
 551             vma->node.start != (flags & PIN_OFFSET_MASK))
 552                 return true;
 553
 554         return false;
 555 }
 556
 557 void __i915_vma_set_map_and_fenceable(struct i915_vma *vma)
 558 {
 559         bool mappable, fenceable;
 560
 561         GEM_BUG_ON(!i915_vma_is_ggtt(vma));
 562         GEM_BUG_ON(!vma->fence_size);
 563
 564         fenceable = (vma->node.size >= vma->fence_size &&
 565                      IS_ALIGNED(vma->node.start, vma->fence_alignment));
 566
 567         mappable = vma->node.start + vma->fence_size <= i915_vm_to_ggtt(vma->vm)->mappable_end;
 568
 569         if (mappable && fenceable)
 570                 set_bit(I915_VMA_CAN_FENCE_BIT, __i915_vma_flags(vma));
 571         else
 572                 clear_bit(I915_VMA_CAN_FENCE_BIT, __i915_vma_flags(vma));
 573 }
 574
 575 bool i915_gem_valid_gtt_space(struct i915_vma *vma, unsigned long color)
 576 {
 577         struct drm_mm_node *node = &vma->node;
 578         struct drm_mm_node *other;
 579
 580         /*
 581          * On some machines we have to be careful when putting differing types
 582          * of snoopable memory together to avoid the prefetcher crossing memory
 583          * domains and dying. During vm initialisation, we decide whether or not
 584          * these constraints apply and set the drm_mm.color_adjust
 585          * appropriately.
 586          */
 587         if (!i915_vm_has_cache_coloring(vma->vm))
 588                 return true;
 589
 590         /* Only valid to be called on an already inserted vma */
 591         GEM_BUG_ON(!drm_mm_node_allocated(node));
 592         GEM_BUG_ON(list_empty(&node->node_list));
 593
 594         other = list_prev_entry(node, node_list);
 595         if (i915_node_color_differs(other, color) &&
 596             !drm_mm_hole_follows(other))
 597                 return false;
 598
 599         other = list_next_entry(node, node_list);
 600         if (i915_node_color_differs(other, color) &&
 601             !drm_mm_hole_follows(node))
 602                 return false;
 603
 604         return true;
 605 }
 606
 607 /**
 608  * i915_vma_insert - finds a slot for the vma in its address space
 609  * @vma: the vma
 610  * @size: requested size in bytes (can be larger than the VMA)
 611  * @alignment: required alignment
 612  * @flags: mask of PIN_* flags to use
 613  *
 614  * First we try to allocate some free space that meets the requirements for
 615  * the VMA. Failiing that, if the flags permit, it will evict an old VMA,
 616  * preferrably the oldest idle entry to make room for the new VMA.
 617  *
 618  * Returns:
 619  * 0 on success, negative error code otherwise.
 620  */
 621 static int
 622 i915_vma_insert(struct i915_vma *vma, u64 size, u64 alignment, u64 flags)
 623 {
 624         unsigned long color;
 625         u64 start, end;
 626         int ret;
 627
 628         GEM_BUG_ON(i915_vma_is_bound(vma, I915_VMA_GLOBAL_BIND | I915_VMA_LOCAL_BIND));
 629         GEM_BUG_ON(drm_mm_node_allocated(&vma->node));
 630
 631         size = max(size, vma->size);
 632         alignment = max(alignment, vma->display_alignment);
 633         if (flags & PIN_MAPPABLE) {
 634                 size = max_t(typeof(size), size, vma->fence_size);
 635                 alignment = max_t(typeof(alignment),
 636                                   alignment, vma->fence_alignment);
 637         }
 638
 639         GEM_BUG_ON(!IS_ALIGNED(size, I915_GTT_PAGE_SIZE));
 640         GEM_BUG_ON(!IS_ALIGNED(alignment, I915_GTT_MIN_ALIGNMENT));
 641         GEM_BUG_ON(!is_power_of_2(alignment));
 642
 643         start = flags & PIN_OFFSET_BIAS ? flags & PIN_OFFSET_MASK : 0;
 644         GEM_BUG_ON(!IS_ALIGNED(start, I915_GTT_PAGE_SIZE));
 645
 646         end = vma->vm->total;
 647         if (flags & PIN_MAPPABLE)
 648                 end = min_t(u64, end, i915_vm_to_ggtt(vma->vm)->mappable_end);
 649         if (flags & PIN_ZONE_4G)
 650                 end = min_t(u64, end, (1ULL << 32) - I915_GTT_PAGE_SIZE);
 651         GEM_BUG_ON(!IS_ALIGNED(end, I915_GTT_PAGE_SIZE));
 652
 653         /* If binding the object/GGTT view requires more space than the entire
 654          * aperture has, reject it early before evicting everything in a vain
 655          * attempt to find space.
 656          */
 657         if (size > end) {
 658                 DRM_DEBUG("Attempting to bind an object larger than the aperture: request=%llu > %s aperture=%llu\n",
 659                           size, flags & PIN_MAPPABLE ? "mappable" : "total",
 660                           end);
 661                 return -ENOSPC;
 662         }
 663
 664         color = 0;
 665         if (vma->obj && i915_vm_has_cache_coloring(vma->vm))
 666                 color = vma->obj->cache_level;
 667
 668         if (flags & PIN_OFFSET_FIXED) {
 669                 u64 offset = flags & PIN_OFFSET_MASK;
 670                 if (!IS_ALIGNED(offset, alignment) ||
 671                     range_overflows(offset, size, end))
 672                         return -EINVAL;
 673
 674                 ret = i915_gem_gtt_reserve(vma->vm, &vma->node,
 675                                            size, offset, color,
 676                                            flags);
 677                 if (ret)
 678                         return ret;
 679         } else {
 680                 /*
 681                  * We only support huge gtt pages through the 48b PPGTT,
 682                  * however we also don't want to force any alignment for
 683                  * objects which need to be tightly packed into the low 32bits.
 684                  *
 685                  * Note that we assume that GGTT are limited to 4GiB for the
 686                  * forseeable future. See also i915_ggtt_offset().
 687                  */
 688                 if (upper_32_bits(end - 1) &&
 689                     vma->page_sizes.sg > I915_GTT_PAGE_SIZE) {
 690                         /*
 691                          * We can't mix 64K and 4K PTEs in the same page-table
 692                          * (2M block), and so to avoid the ugliness and
 693                          * complexity of coloring we opt for just aligning 64K
 694                          * objects to 2M.
 695                          */
 696                         u64 page_alignment =
 697                                 rounddown_pow_of_two(vma->page_sizes.sg |
 698                                                      I915_GTT_PAGE_SIZE_2M);
 699
 700                         /*
 701                          * Check we don't expand for the limited Global GTT
 702                          * (mappable aperture is even more precious!). This
 703                          * also checks that we exclude the aliasing-ppgtt.
 704                          */
 705                         GEM_BUG_ON(i915_vma_is_ggtt(vma));
 706
 707                         alignment = max(alignment, page_alignment);
 708
 709                         if (vma->page_sizes.sg & I915_GTT_PAGE_SIZE_64K)
 710                                 size = round_up(size, I915_GTT_PAGE_SIZE_2M);
 711                 }
 712
 713                 ret = i915_gem_gtt_insert(vma->vm, &vma->node,
 714                                           size, alignment, color,
 715                                           start, end, flags);
 716                 if (ret)
 717                         return ret;
 718
 719                 GEM_BUG_ON(vma->node.start < start);
 720                 GEM_BUG_ON(vma->node.start + vma->node.size > end);
 721         }
 722         GEM_BUG_ON(!drm_mm_node_allocated(&vma->node));
 723         GEM_BUG_ON(!i915_gem_valid_gtt_space(vma, color));
 724
 725         list_add_tail(&vma->vm_link, &vma->vm->bound_list);
 726
 727         return 0;
 728 }
 729
 730 static void
 731 i915_vma_detach(struct i915_vma *vma)
 732 {
 733         GEM_BUG_ON(!drm_mm_node_allocated(&vma->node));
 734         GEM_BUG_ON(i915_vma_is_bound(vma, I915_VMA_GLOBAL_BIND | I915_VMA_LOCAL_BIND));
 735
 736         /*
 737          * And finally now the object is completely decoupled from this
 738          * vma, we can drop its hold on the backing storage and allow
 739          * it to be reaped by the shrinker.
 740          */
 741         list_del(&vma->vm_link);
 742 }
 743
 744 static bool try_qad_pin(struct i915_vma *vma, unsigned int flags)
 745 {
 746         unsigned int bound;
 747         bool pinned = true;
 748
 749         bound = atomic_read(&vma->flags);
 750         do {
 751                 if (unlikely(flags & ~bound))
 752                         return false;
 753
 754                 if (unlikely(bound & (I915_VMA_OVERFLOW | I915_VMA_ERROR)))
 755                         return false;
 756
 757                 if (!(bound & I915_VMA_PIN_MASK))
 758                         goto unpinned;
 759
 760                 GEM_BUG_ON(((bound + 1) & I915_VMA_PIN_MASK) == 0);
 761         } while (!atomic_try_cmpxchg(&vma->flags, &bound, bound + 1));
 762
 763         return true;
 764
 765 unpinned:
 766         /*
 767          * If pin_count==0, but we are bound, check under the lock to avoid
 768          * racing with a concurrent i915_vma_unbind().
 769          */
 770         mutex_lock(&vma->vm->mutex);
 771         do {
 772                 if (unlikely(bound & (I915_VMA_OVERFLOW | I915_VMA_ERROR))) {
 773                         pinned = false;
 774                         break;
 775                 }
 776
 777                 if (unlikely(flags & ~bound)) {
 778                         pinned = false;
 779                         break;
 780                 }
 781         } while (!atomic_try_cmpxchg(&vma->flags, &bound, bound + 1));
 782         mutex_unlock(&vma->vm->mutex);
 783
 784         return pinned;
 785 }
 786
 787 static int vma_get_pages(struct i915_vma *vma)
 788 {
 789         int err = 0;
 790
 791         if (atomic_add_unless(&vma->pages_count, 1, 0))
 792                 return 0;
 793
 794         /* Allocations ahoy! */
 795         if (mutex_lock_interruptible(&vma->pages_mutex))
 796                 return -EINTR;
 797
 798         if (!atomic_read(&vma->pages_count)) {
 799                 if (vma->obj) {
 800                         err = i915_gem_object_pin_pages(vma->obj);
 801                         if (err)
 802                                 goto unlock;
 803                 }
 804
 805                 err = vma->ops->set_pages(vma);
 806                 if (err) {
 807                         if (vma->obj)
 808                                 i915_gem_object_unpin_pages(vma->obj);
 809                         goto unlock;
 810                 }
 811         }
 812         atomic_inc(&vma->pages_count);
 813
 814 unlock:
 815         mutex_unlock(&vma->pages_mutex);
 816
 817         return err;
 818 }
 819
 820 static void __vma_put_pages(struct i915_vma *vma, unsigned int count)
 821 {
 822         /* We allocate under vma_get_pages, so beware the shrinker */
 823         mutex_lock_nested(&vma->pages_mutex, SINGLE_DEPTH_NESTING);
 824         GEM_BUG_ON(atomic_read(&vma->pages_count) < count);
 825         if (atomic_sub_return(count, &vma->pages_count) == 0) {
 826                 vma->ops->clear_pages(vma);
 827                 GEM_BUG_ON(vma->pages);
 828                 if (vma->obj)
 829                         i915_gem_object_unpin_pages(vma->obj);
 830         }
 831         mutex_unlock(&vma->pages_mutex);
 832 }
 833
 834 static void vma_put_pages(struct i915_vma *vma)
 835 {
 836         if (atomic_add_unless(&vma->pages_count, -1, 1))
 837                 return;
 838
 839         __vma_put_pages(vma, 1);
 840 }
 841
 842 static void vma_unbind_pages(struct i915_vma *vma)
 843 {
 844         unsigned int count;
 845
 846         lockdep_assert_held(&vma->vm->mutex);
 847
 848         /* The upper portion of pages_count is the number of bindings */
 849         count = atomic_read(&vma->pages_count);
 850         count >>= I915_VMA_PAGES_BIAS;
 851         GEM_BUG_ON(!count);
 852
 853         __vma_put_pages(vma, count | count << I915_VMA_PAGES_BIAS);
 854 }
 855
 856 int i915_vma_pin(struct i915_vma *vma, u64 size, u64 alignment, u64 flags)
 857 {
 858         struct i915_vma_work *work = NULL;
 859         intel_wakeref_t wakeref = 0;
 860         unsigned int bound;
 861         int err;
 862
 863         BUILD_BUG_ON(PIN_GLOBAL != I915_VMA_GLOBAL_BIND);
 864         BUILD_BUG_ON(PIN_USER != I915_VMA_LOCAL_BIND);
 865
 866         GEM_BUG_ON(!(flags & (PIN_USER | PIN_GLOBAL)));
 867
 868         /* First try and grab the pin without rebinding the vma */
 869         if (try_qad_pin(vma, flags & I915_VMA_BIND_MASK))
 870                 return 0;
 871
 872         err = vma_get_pages(vma);
 873         if (err)
 874                 return err;
 875
 876         if (flags & vma->vm->bind_async_flags) {
 877                 work = i915_vma_work();
 878                 if (!work) {
 879                         err = -ENOMEM;
 880                         goto err_pages;
 881                 }
 882         }
 883
 884         if (flags & PIN_GLOBAL)
 885                 wakeref = intel_runtime_pm_get(&vma->vm->i915->runtime_pm);
 886
 887         /*
 888          * Differentiate between user/kernel vma inside the aliasing-ppgtt.
 889          *
 890          * We conflate the Global GTT with the user's vma when using the
 891          * aliasing-ppgtt, but it is still vitally important to try and
 892          * keep the use cases distinct. For example, userptr objects are
 893          * not allowed inside the Global GTT as that will cause lock
 894          * inversions when we have to evict them the mmu_notifier callbacks -
 895          * but they are allowed to be part of the user ppGTT which can never
 896          * be mapped. As such we try to give the distinct users of the same
 897          * mutex, distinct lockclasses [equivalent to how we keep i915_ggtt
 898          * and i915_ppgtt separate].
 899          *
 900          * NB this may cause us to mask real lock inversions -- while the
 901          * code is safe today, lockdep may not be able to spot future
 902          * transgressions.
 903          */
 904         err = mutex_lock_interruptible_nested(&vma->vm->mutex,
 905                                               !(flags & PIN_GLOBAL));
 906         if (err)
 907                 goto err_fence;
 908
 909         /* No more allocations allowed now we hold vm->mutex */
 910
 911         if (unlikely(i915_vma_is_closed(vma))) {
 912                 err = -ENOENT;
 913                 goto err_unlock;
 914         }
 915
 916         bound = atomic_read(&vma->flags);
 917         if (unlikely(bound & I915_VMA_ERROR)) {
 918                 err = -ENOMEM;
 919                 goto err_unlock;
 920         }
 921
 922         if (unlikely(!((bound + 1) & I915_VMA_PIN_MASK))) {
 923                 err = -EAGAIN; /* pins are meant to be fairly temporary */
 924                 goto err_unlock;
 925         }
 926
 927         if (unlikely(!(flags & ~bound & I915_VMA_BIND_MASK))) {
 928                 __i915_vma_pin(vma);
 929                 goto err_unlock;
 930         }
 931
 932         err = i915_active_acquire(&vma->active);
 933         if (err)
 934                 goto err_unlock;
 935
 936         if (!(bound & I915_VMA_BIND_MASK)) {
 937                 err = i915_vma_insert(vma, size, alignment, flags);
 938                 if (err)
 939                         goto err_active;
 940
 941                 if (i915_is_ggtt(vma->vm))
 942                         __i915_vma_set_map_and_fenceable(vma);
 943         }
 944
 945         GEM_BUG_ON(!vma->pages);
 946         err = i915_vma_bind(vma,
 947                             vma->obj ? vma->obj->cache_level : 0,
 948                             flags, work);
 949         if (err)
 950                 goto err_remove;
 951
 952         /* There should only be at most 2 active bindings (user, global) */
 953         GEM_BUG_ON(bound + I915_VMA_PAGES_ACTIVE < bound);
 954         atomic_add(I915_VMA_PAGES_ACTIVE, &vma->pages_count);
 955         list_move_tail(&vma->vm_link, &vma->vm->bound_list);
 956
 957         __i915_vma_pin(vma);
 958         GEM_BUG_ON(!i915_vma_is_pinned(vma));
 959         GEM_BUG_ON(!i915_vma_is_bound(vma, flags));
 960         GEM_BUG_ON(i915_vma_misplaced(vma, size, alignment, flags));
 961
 962 err_remove:
 963         if (!i915_vma_is_bound(vma, I915_VMA_BIND_MASK)) {
 964                 i915_vma_detach(vma);
 965                 drm_mm_remove_node(&vma->node);
 966         }
 967 err_active:
 968         i915_active_release(&vma->active);
 969 err_unlock:
 970         mutex_unlock(&vma->vm->mutex);
 971 err_fence:
 972         if (work)
 973                 dma_fence_work_commit_imm(&work->base);
 974         if (wakeref)
 975                 intel_runtime_pm_put(&vma->vm->i915->runtime_pm, wakeref);
 976 err_pages:
 977         vma_put_pages(vma);
 978         return err;
 979 }
 980
 981 static void flush_idle_contexts(struct intel_gt *gt)
 982 {
 983         struct intel_engine_cs *engine;
 984         enum intel_engine_id id;
 985
 986         for_each_engine(engine, gt, id)
 987                 intel_engine_flush_barriers(engine);
 988
 989         intel_gt_wait_for_idle(gt, MAX_SCHEDULE_TIMEOUT);
 990 }
 991
 992 int i915_ggtt_pin(struct i915_vma *vma, u32 align, unsigned int flags)
 993 {
 994         struct i915_address_space *vm = vma->vm;
 995         int err;
 996
 997         GEM_BUG_ON(!i915_vma_is_ggtt(vma));
 998
 999         do {
1000                 err = i915_vma_pin(vma, 0, align, flags | PIN_GLOBAL);
1001                 if (err != -ENOSPC) {
1002                         if (!err) {
1003                                 err = i915_vma_wait_for_bind(vma);
1004                                 if (err)
1005                                         i915_vma_unpin(vma);
1006                         }
1007                         return err;
1008                 }
1009
1010                 /* Unlike i915_vma_pin, we don't take no for an answer! */
1011                 flush_idle_contexts(vm->gt);
1012                 if (mutex_lock_interruptible(&vm->mutex) == 0) {
1013                         i915_gem_evict_vm(vm);
1014                         mutex_unlock(&vm->mutex);
1015                 }
1016         } while (1);
1017 }
1018
1019 static void __vma_close(struct i915_vma *vma, struct intel_gt *gt)
1020 {
1021         /*
1022          * We defer actually closing, unbinding and destroying the VMA until
1023          * the next idle point, or if the object is freed in the meantime. By
1024          * postponing the unbind, we allow for it to be resurrected by the
1025          * client, avoiding the work required to rebind the VMA. This is
1026          * advantageous for DRI, where the client/server pass objects
1027          * between themselves, temporarily opening a local VMA to the
1028          * object, and then closing it again. The same object is then reused
1029          * on the next frame (or two, depending on the depth of the swap queue)
1030          * causing us to rebind the VMA once more. This ends up being a lot
1031          * of wasted work for the steady state.
1032          */
1033         GEM_BUG_ON(i915_vma_is_closed(vma));
1034         list_add(&vma->closed_link, &gt->closed_vma);
1035 }
1036
1037 void i915_vma_close(struct i915_vma *vma)
1038 {
1039         struct intel_gt *gt = vma->vm->gt;
1040         unsigned long flags;
1041
1042         if (i915_vma_is_ggtt(vma))
1043                 return;
1044
1045         GEM_BUG_ON(!atomic_read(&vma->open_count));
1046         if (atomic_dec_and_lock_irqsave(&vma->open_count,
1047                                         &gt->closed_lock,
1048                                         flags)) {
1049                 __vma_close(vma, gt);
1050                 spin_unlock_irqrestore(&gt->closed_lock, flags);
1051         }
1052 }
1053
1054 static void __i915_vma_remove_closed(struct i915_vma *vma)
1055 {
1056         struct intel_gt *gt = vma->vm->gt;
1057
1058         spin_lock_irq(&gt->closed_lock);
1059         list_del_init(&vma->closed_link);
1060         spin_unlock_irq(&gt->closed_lock);
1061 }
1062
1063 void i915_vma_reopen(struct i915_vma *vma)
1064 {
1065         if (i915_vma_is_closed(vma))
1066                 __i915_vma_remove_closed(vma);
1067 }
1068
1069 void i915_vma_release(struct kref *ref)
1070 {
1071         struct i915_vma *vma = container_of(ref, typeof(*vma), ref);
1072
1073         if (drm_mm_node_allocated(&vma->node)) {
1074                 mutex_lock(&vma->vm->mutex);
1075                 atomic_and(~I915_VMA_PIN_MASK, &vma->flags);
1076                 WARN_ON(__i915_vma_unbind(vma));
1077                 mutex_unlock(&vma->vm->mutex);
1078                 GEM_BUG_ON(drm_mm_node_allocated(&vma->node));
1079         }
1080         GEM_BUG_ON(i915_vma_is_active(vma));
1081
1082         if (vma->obj) {
1083                 struct drm_i915_gem_object *obj = vma->obj;
1084
1085                 spin_lock(&obj->vma.lock);
1086                 list_del(&vma->obj_link);
1087                 if (!RB_EMPTY_NODE(&vma->obj_node))
1088                         rb_erase(&vma->obj_node, &obj->vma.tree);
1089                 spin_unlock(&obj->vma.lock);
1090         }
1091
1092         __i915_vma_remove_closed(vma);
1093         i915_vm_put(vma->vm);
1094
1095         i915_active_fini(&vma->active);
1096         i915_vma_free(vma);
1097 }
1098
1099 void i915_vma_parked(struct intel_gt *gt)
1100 {
1101         struct i915_vma *vma, *next;
1102         LIST_HEAD(closed);
1103
1104         spin_lock_irq(&gt->closed_lock);
1105         list_for_each_entry_safe(vma, next, &gt->closed_vma, closed_link) {
1106                 struct drm_i915_gem_object *obj = vma->obj;
1107                 struct i915_address_space *vm = vma->vm;
1108
1109                 /* XXX All to avoid keeping a reference on i915_vma itself */
1110
1111                 if (!kref_get_unless_zero(&obj->base.refcount))
1112                         continue;
1113
1114                 if (!i915_vm_tryopen(vm)) {
1115                         i915_gem_object_put(obj);
1116                         continue;
1117                 }
1118
1119                 list_move(&vma->closed_link, &closed);
1120         }
1121         spin_unlock_irq(&gt->closed_lock);
1122
1123         /* As the GT is held idle, no vma can be reopened as we destroy them */
1124         list_for_each_entry_safe(vma, next, &closed, closed_link) {
1125                 struct drm_i915_gem_object *obj = vma->obj;
1126                 struct i915_address_space *vm = vma->vm;
1127
1128                 INIT_LIST_HEAD(&vma->closed_link);
1129                 __i915_vma_put(vma);
1130
1131                 i915_gem_object_put(obj);
1132                 i915_vm_close(vm);
1133         }
1134 }
1135
1136 static void __i915_vma_iounmap(struct i915_vma *vma)
1137 {
1138         GEM_BUG_ON(i915_vma_is_pinned(vma));
1139
1140         if (vma->iomap == NULL)
1141                 return;
1142
1143         io_mapping_unmap(vma->iomap);
1144         vma->iomap = NULL;
1145 }
1146
1147 void i915_vma_revoke_mmap(struct i915_vma *vma)
1148 {
1149         struct drm_vma_offset_node *node;
1150         u64 vma_offset;
1151
1152         if (!i915_vma_has_userfault(vma))
1153                 return;
1154
1155         GEM_BUG_ON(!i915_vma_is_map_and_fenceable(vma));
1156         GEM_BUG_ON(!vma->obj->userfault_count);
1157
1158         node = &vma->mmo->vma_node;
1159         vma_offset = vma->ggtt_view.partial.offset << PAGE_SHIFT;
1160         unmap_mapping_range(vma->vm->i915->drm.anon_inode->i_mapping,
1161                             drm_vma_node_offset_addr(node) + vma_offset,
1162                             vma->size,
1163                             1);
1164
1165         i915_vma_unset_userfault(vma);
1166         if (!--vma->obj->userfault_count)
1167                 list_del(&vma->obj->userfault_link);
1168 }
1169
1170 int __i915_vma_move_to_active(struct i915_vma *vma, struct i915_request *rq)
1171 {
1172         int err;
1173
1174         GEM_BUG_ON(!i915_vma_is_pinned(vma));
1175
1176         /* Wait for the vma to be bound before we start! */
1177         err = i915_request_await_active(rq, &vma->active,
1178                                         I915_ACTIVE_AWAIT_EXCL);
1179         if (err)
1180                 return err;
1181
1182         return i915_active_add_request(&vma->active, rq);
1183 }
1184
1185 int i915_vma_move_to_active(struct i915_vma *vma,
1186                             struct i915_request *rq,
1187                             unsigned int flags)
1188 {
1189         struct drm_i915_gem_object *obj = vma->obj;
1190         int err;
1191
1192         assert_object_held(obj);
1193
1194         err = __i915_vma_move_to_active(vma, rq);
1195         if (unlikely(err))
1196                 return err;
1197
1198         if (flags & EXEC_OBJECT_WRITE) {
1199                 struct intel_frontbuffer *front;
1200
1201                 front = __intel_frontbuffer_get(obj);
1202                 if (unlikely(front)) {
1203                         if (intel_frontbuffer_invalidate(front, ORIGIN_CS))
1204                                 i915_active_add_request(&front->write, rq);
1205                         intel_frontbuffer_put(front);
1206                 }
1207
1208                 dma_resv_add_excl_fence(vma->resv, &rq->fence);
1209                 obj->write_domain = I915_GEM_DOMAIN_RENDER;
1210                 obj->read_domains = 0;
1211         } else {
1212                 err = dma_resv_reserve_shared(vma->resv, 1);
1213                 if (unlikely(err))
1214                         return err;
1215
1216                 dma_resv_add_shared_fence(vma->resv, &rq->fence);
1217                 obj->write_domain = 0;
1218         }
1219
1220         if (flags & EXEC_OBJECT_NEEDS_FENCE && vma->fence)
1221                 i915_active_add_request(&vma->fence->active, rq);
1222
1223         obj->read_domains |= I915_GEM_GPU_DOMAINS;
1224         obj->mm.dirty = true;
1225
1226         GEM_BUG_ON(!i915_vma_is_active(vma));
1227         return 0;
1228 }
1229
1230 void __i915_vma_evict(struct i915_vma *vma)
1231 {
1232         GEM_BUG_ON(i915_vma_is_pinned(vma));
1233
1234         if (i915_vma_is_map_and_fenceable(vma)) {
1235                 /* Force a pagefault for domain tracking on next user access */
1236                 i915_vma_revoke_mmap(vma);
1237
1238                 /*
1239                  * Check that we have flushed all writes through the GGTT
1240                  * before the unbind, other due to non-strict nature of those
1241                  * indirect writes they may end up referencing the GGTT PTE
1242                  * after the unbind.
1243                  *
1244                  * Note that we may be concurrently poking at the GGTT_WRITE
1245                  * bit from set-domain, as we mark all GGTT vma associated
1246                  * with an object. We know this is for another vma, as we
1247                  * are currently unbinding this one -- so if this vma will be
1248                  * reused, it will be refaulted and have its dirty bit set
1249                  * before the next write.
1250                  */
1251                 i915_vma_flush_writes(vma);
1252
1253                 /* release the fence reg _after_ flushing */
1254                 i915_vma_revoke_fence(vma);
1255
1256                 __i915_vma_iounmap(vma);
1257                 clear_bit(I915_VMA_CAN_FENCE_BIT, __i915_vma_flags(vma));
1258         }
1259         GEM_BUG_ON(vma->fence);
1260         GEM_BUG_ON(i915_vma_has_userfault(vma));
1261
1262         if (likely(atomic_read(&vma->vm->open))) {
1263                 trace_i915_vma_unbind(vma);
1264                 vma->ops->unbind_vma(vma->vm, vma);
1265         }
1266         atomic_and(~(I915_VMA_BIND_MASK | I915_VMA_ERROR | I915_VMA_GGTT_WRITE),
1267                    &vma->flags);
1268
1269         i915_vma_detach(vma);
1270         vma_unbind_pages(vma);
1271 }
1272
1273 int __i915_vma_unbind(struct i915_vma *vma)
1274 {
1275         int ret;
1276
1277         lockdep_assert_held(&vma->vm->mutex);
1278
1279         if (!drm_mm_node_allocated(&vma->node))
1280                 return 0;
1281
1282         if (i915_vma_is_pinned(vma)) {
1283                 vma_print_allocator(vma, "is pinned");
1284                 return -EAGAIN;
1285         }
1286
1287         /*
1288          * After confirming that no one else is pinning this vma, wait for
1289          * any laggards who may have crept in during the wait (through
1290          * a residual pin skipping the vm->mutex) to complete.
1291          */
1292         ret = i915_vma_sync(vma);
1293         if (ret)
1294                 return ret;
1295
1296         GEM_BUG_ON(i915_vma_is_active(vma));
1297         __i915_vma_evict(vma);
1298
1299         drm_mm_remove_node(&vma->node); /* pairs with i915_vma_release() */
1300         return 0;
1301 }
1302
1303 int i915_vma_unbind(struct i915_vma *vma)
1304 {
1305         struct i915_address_space *vm = vma->vm;
1306         intel_wakeref_t wakeref = 0;
1307         int err;
1308
1309         /* Optimistic wait before taking the mutex */
1310         err = i915_vma_sync(vma);
1311         if (err)
1312                 return err;
1313
1314         if (!drm_mm_node_allocated(&vma->node))
1315                 return 0;
1316
1317         if (i915_vma_is_pinned(vma)) {
1318                 vma_print_allocator(vma, "is pinned");
1319                 return -EAGAIN;
1320         }
1321
1322         if (i915_vma_is_bound(vma, I915_VMA_GLOBAL_BIND))
1323                 /* XXX not always required: nop_clear_range */
1324                 wakeref = intel_runtime_pm_get(&vm->i915->runtime_pm);
1325
1326         err = mutex_lock_interruptible_nested(&vma->vm->mutex, !wakeref);
1327         if (err)
1328                 goto out_rpm;
1329
1330         err = __i915_vma_unbind(vma);
1331         mutex_unlock(&vm->mutex);
1332
1333 out_rpm:
1334         if (wakeref)
1335                 intel_runtime_pm_put(&vm->i915->runtime_pm, wakeref);
1336         return err;
1337 }
1338
1339 struct i915_vma *i915_vma_make_unshrinkable(struct i915_vma *vma)
1340 {
1341         i915_gem_object_make_unshrinkable(vma->obj);
1342         return vma;
1343 }
1344
1345 void i915_vma_make_shrinkable(struct i915_vma *vma)
1346 {
1347         i915_gem_object_make_shrinkable(vma->obj);
1348 }
1349
1350 void i915_vma_make_purgeable(struct i915_vma *vma)
1351 {
1352         i915_gem_object_make_purgeable(vma->obj);
1353 }
1354
1355 #if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
1356 #include "selftests/i915_vma.c"
1357 #endif
1358
1359 static void i915_global_vma_shrink(void)
1360 {
1361         kmem_cache_shrink(global.slab_vmas);
1362 }
1363
1364 static void i915_global_vma_exit(void)
1365 {
1366         kmem_cache_destroy(global.slab_vmas);
1367 }
1368
1369 static struct i915_global_vma global = { {
1370         .shrink = i915_global_vma_shrink,
1371         .exit = i915_global_vma_exit,
1372 } };
1373
1374 int __init i915_global_vma_init(void)
1375 {
1376         global.slab_vmas = KMEM_CACHE(i915_vma, SLAB_HWCACHE_ALIGN);
1377         if (!global.slab_vmas)
1378                 return -ENOMEM;
1379
1380         i915_global_register(&global.base);
1381         return 0;
1382 }