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 *vma;
 108         struct rb_node *rb, **p;
 109
 110         /* The aliasing_ppgtt should never be used directly! */
 111         GEM_BUG_ON(vm == &vm->gt->ggtt->alias->vm);
 112
 113         vma = i915_vma_alloc();
 114         if (vma == NULL)
 115                 return ERR_PTR(-ENOMEM);
 116
 117         kref_init(&vma->ref);
 118         mutex_init(&vma->pages_mutex);
 119         vma->vm = i915_vm_get(vm);
 120         vma->ops = &vm->vma_ops;
 121         vma->obj = obj;
 122         vma->resv = obj->base.resv;
 123         vma->size = obj->base.size;
 124         vma->display_alignment = I915_GTT_MIN_ALIGNMENT;
 125
 126         i915_active_init(&vma->active, __i915_vma_active, __i915_vma_retire);
 127
 128         /* Declare ourselves safe for use inside shrinkers */
 129         if (IS_ENABLED(CONFIG_LOCKDEP)) {
 130                 fs_reclaim_acquire(GFP_KERNEL);
 131                 might_lock(&vma->active.mutex);
 132                 fs_reclaim_release(GFP_KERNEL);
 133         }
 134
 135         INIT_LIST_HEAD(&vma->closed_link);
 136
 137         if (view && view->type != I915_GGTT_VIEW_NORMAL) {
 138                 vma->ggtt_view = *view;
 139                 if (view->type == I915_GGTT_VIEW_PARTIAL) {
 140                         GEM_BUG_ON(range_overflows_t(u64,
 141                                                      view->partial.offset,
 142                                                      view->partial.size,
 143                                                      obj->base.size >> PAGE_SHIFT));
 144                         vma->size = view->partial.size;
 145                         vma->size <<= PAGE_SHIFT;
 146                         GEM_BUG_ON(vma->size > obj->base.size);
 147                 } else if (view->type == I915_GGTT_VIEW_ROTATED) {
 148                         vma->size = intel_rotation_info_size(&view->rotated);
 149                         vma->size <<= PAGE_SHIFT;
 150                 } else if (view->type == I915_GGTT_VIEW_REMAPPED) {
 151                         vma->size = intel_remapped_info_size(&view->remapped);
 152                         vma->size <<= PAGE_SHIFT;
 153                 }
 154         }
 155
 156         if (unlikely(vma->size > vm->total))
 157                 goto err_vma;
 158
 159         GEM_BUG_ON(!IS_ALIGNED(vma->size, I915_GTT_PAGE_SIZE));
 160
 161         spin_lock(&obj->vma.lock);
 162
 163         if (i915_is_ggtt(vm)) {
 164                 if (unlikely(overflows_type(vma->size, u32)))
 165                         goto err_unlock;
 166
 167                 vma->fence_size = i915_gem_fence_size(vm->i915, vma->size,
 168                                                       i915_gem_object_get_tiling(obj),
 169                                                       i915_gem_object_get_stride(obj));
 170                 if (unlikely(vma->fence_size < vma->size || /* overflow */
 171                              vma->fence_size > vm->total))
 172                         goto err_unlock;
 173
 174                 GEM_BUG_ON(!IS_ALIGNED(vma->fence_size, I915_GTT_MIN_ALIGNMENT));
 175
 176                 vma->fence_alignment = i915_gem_fence_alignment(vm->i915, vma->size,
 177                                                                 i915_gem_object_get_tiling(obj),
 178                                                                 i915_gem_object_get_stride(obj));
 179                 GEM_BUG_ON(!is_power_of_2(vma->fence_alignment));
 180
 181                 __set_bit(I915_VMA_GGTT_BIT, __i915_vma_flags(vma));
 182         }
 183
 184         rb = NULL;
 185         p = &obj->vma.tree.rb_node;
 186         while (*p) {
 187                 struct i915_vma *pos;
 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                         spin_unlock(&obj->vma.lock);
 201                         i915_vma_free(vma);
 202                         return pos;
 203                 }
 204
 205                 if (cmp < 0)
 206                         p = &rb->rb_right;
 207                 else
 208                         p = &rb->rb_left;
 209         }
 210         rb_link_node(&vma->obj_node, rb, p);
 211         rb_insert_color(&vma->obj_node, &obj->vma.tree);
 212
 213         if (i915_vma_is_ggtt(vma))
 214                 /*
 215                  * We put the GGTT vma at the start of the vma-list, followed
 216                  * by the ppGGTT vma. This allows us to break early when
 217                  * iterating over only the GGTT vma for an object, see
 218                  * for_each_ggtt_vma()
 219                  */
 220                 list_add(&vma->obj_link, &obj->vma.list);
 221         else
 222                 list_add_tail(&vma->obj_link, &obj->vma.list);
 223
 224         spin_unlock(&obj->vma.lock);
 225
 226         return vma;
 227
 228 err_unlock:
 229         spin_unlock(&obj->vma.lock);
 230 err_vma:
 231         i915_vma_free(vma);
 232         return ERR_PTR(-E2BIG);
 233 }
 234
 235 static struct i915_vma *
 236 vma_lookup(struct drm_i915_gem_object *obj,
 237            struct i915_address_space *vm,
 238            const struct i915_ggtt_view *view)
 239 {
 240         struct rb_node *rb;
 241
 242         rb = obj->vma.tree.rb_node;
 243         while (rb) {
 244                 struct i915_vma *vma = rb_entry(rb, struct i915_vma, obj_node);
 245                 long cmp;
 246
 247                 cmp = i915_vma_compare(vma, vm, view);
 248                 if (cmp == 0)
 249                         return vma;
 250
 251                 if (cmp < 0)
 252                         rb = rb->rb_right;
 253                 else
 254                         rb = rb->rb_left;
 255         }
 256
 257         return NULL;
 258 }
 259
 260 /**
 261  * i915_vma_instance - return the singleton instance of the VMA
 262  * @obj: parent &struct drm_i915_gem_object to be mapped
 263  * @vm: address space in which the mapping is located
 264  * @view: additional mapping requirements
 265  *
 266  * i915_vma_instance() looks up an existing VMA of the @obj in the @vm with
 267  * the same @view characteristics. If a match is not found, one is created.
 268  * Once created, the VMA is kept until either the object is freed, or the
 269  * address space is closed.
 270  *
 271  * Returns the vma, or an error pointer.
 272  */
 273 struct i915_vma *
 274 i915_vma_instance(struct drm_i915_gem_object *obj,
 275                   struct i915_address_space *vm,
 276                   const struct i915_ggtt_view *view)
 277 {
 278         struct i915_vma *vma;
 279
 280         GEM_BUG_ON(view && !i915_is_ggtt(vm));
 281         GEM_BUG_ON(!atomic_read(&vm->open));
 282
 283         spin_lock(&obj->vma.lock);
 284         vma = vma_lookup(obj, vm, view);
 285         spin_unlock(&obj->vma.lock);
 286
 287         /* vma_create() will resolve the race if another creates the vma */
 288         if (unlikely(!vma))
 289                 vma = vma_create(obj, vm, view);
 290
 291         GEM_BUG_ON(!IS_ERR(vma) && i915_vma_compare(vma, vm, view));
 292         return vma;
 293 }
 294
 295 struct i915_vma_work {
 296         struct dma_fence_work base;
 297         struct i915_vma *vma;
 298         struct drm_i915_gem_object *pinned;
 299         struct i915_sw_dma_fence_cb cb;
 300         enum i915_cache_level cache_level;
 301         unsigned int flags;
 302 };
 303
 304 static int __vma_bind(struct dma_fence_work *work)
 305 {
 306         struct i915_vma_work *vw = container_of(work, typeof(*vw), base);
 307         struct i915_vma *vma = vw->vma;
 308         int err;
 309
 310         err = vma->ops->bind_vma(vma, vw->cache_level, vw->flags);
 311         if (err)
 312                 atomic_or(I915_VMA_ERROR, &vma->flags);
 313
 314         return err;
 315 }
 316
 317 static void __vma_release(struct dma_fence_work *work)
 318 {
 319         struct i915_vma_work *vw = container_of(work, typeof(*vw), base);
 320
 321         if (vw->pinned)
 322                 __i915_gem_object_unpin_pages(vw->pinned);
 323 }
 324
 325 static const struct dma_fence_work_ops bind_ops = {
 326         .name = "bind",
 327         .work = __vma_bind,
 328         .release = __vma_release,
 329 };
 330
 331 struct i915_vma_work *i915_vma_work(void)
 332 {
 333         struct i915_vma_work *vw;
 334
 335         vw = kzalloc(sizeof(*vw), GFP_KERNEL);
 336         if (!vw)
 337                 return NULL;
 338
 339         dma_fence_work_init(&vw->base, &bind_ops);
 340         vw->base.dma.error = -EAGAIN; /* disable the worker by default */
 341
 342         return vw;
 343 }
 344
 345 int i915_vma_wait_for_bind(struct i915_vma *vma)
 346 {
 347         int err = 0;
 348
 349         if (rcu_access_pointer(vma->active.excl.fence)) {
 350                 struct dma_fence *fence;
 351
 352                 rcu_read_lock();
 353                 fence = dma_fence_get_rcu_safe(&vma->active.excl.fence);
 354                 rcu_read_unlock();
 355                 if (fence) {
 356                         err = dma_fence_wait(fence, MAX_SCHEDULE_TIMEOUT);
 357                         dma_fence_put(fence);
 358                 }
 359         }
 360
 361         return err;
 362 }
 363
 364 /**
 365  * i915_vma_bind - Sets up PTEs for an VMA in it's corresponding address space.
 366  * @vma: VMA to map
 367  * @cache_level: mapping cache level
 368  * @flags: flags like global or local mapping
 369  * @work: preallocated worker for allocating and binding the PTE
 370  *
 371  * DMA addresses are taken from the scatter-gather table of this object (or of
 372  * this VMA in case of non-default GGTT views) and PTE entries set up.
 373  * Note that DMA addresses are also the only part of the SG table we care about.
 374  */
 375 int i915_vma_bind(struct i915_vma *vma,
 376                   enum i915_cache_level cache_level,
 377                   u32 flags,
 378                   struct i915_vma_work *work)
 379 {
 380         u32 bind_flags;
 381         u32 vma_flags;
 382         int ret;
 383
 384         GEM_BUG_ON(!drm_mm_node_allocated(&vma->node));
 385         GEM_BUG_ON(vma->size > vma->node.size);
 386
 387         if (GEM_DEBUG_WARN_ON(range_overflows(vma->node.start,
 388                                               vma->node.size,
 389                                               vma->vm->total)))
 390                 return -ENODEV;
 391
 392         if (GEM_DEBUG_WARN_ON(!flags))
 393                 return -EINVAL;
 394
 395         bind_flags = flags;
 396         bind_flags &= I915_VMA_GLOBAL_BIND | I915_VMA_LOCAL_BIND;
 397
 398         vma_flags = atomic_read(&vma->flags);
 399         vma_flags &= I915_VMA_GLOBAL_BIND | I915_VMA_LOCAL_BIND;
 400         if (flags & PIN_UPDATE)
 401                 bind_flags |= vma_flags;
 402         else
 403                 bind_flags &= ~vma_flags;
 404         if (bind_flags == 0)
 405                 return 0;
 406
 407         GEM_BUG_ON(!vma->pages);
 408
 409         trace_i915_vma_bind(vma, bind_flags);
 410         if (work && (bind_flags & ~vma_flags) & vma->vm->bind_async_flags) {
 411                 struct dma_fence *prev;
 412
 413                 work->vma = vma;
 414                 work->cache_level = cache_level;
 415                 work->flags = bind_flags | I915_VMA_ALLOC;
 416
 417                 /*
 418                  * Note we only want to chain up to the migration fence on
 419                  * the pages (not the object itself). As we don't track that,
 420                  * yet, we have to use the exclusive fence instead.
 421                  *
 422                  * Also note that we do not want to track the async vma as
 423                  * part of the obj->resv->excl_fence as it only affects
 424                  * execution and not content or object's backing store lifetime.
 425                  */
 426                 prev = i915_active_set_exclusive(&vma->active, &work->base.dma);
 427                 if (prev) {
 428                         __i915_sw_fence_await_dma_fence(&work->base.chain,
 429                                                         prev,
 430                                                         &work->cb);
 431                         dma_fence_put(prev);
 432                 }
 433
 434                 work->base.dma.error = 0; /* enable the queue_work() */
 435
 436                 if (vma->obj) {
 437                         __i915_gem_object_pin_pages(vma->obj);
 438                         work->pinned = vma->obj;
 439                 }
 440         } else {
 441                 ret = vma->ops->bind_vma(vma, cache_level, bind_flags);
 442                 if (ret)
 443                         return ret;
 444         }
 445
 446         atomic_or(bind_flags, &vma->flags);
 447         return 0;
 448 }
 449
 450 void __iomem *i915_vma_pin_iomap(struct i915_vma *vma)
 451 {
 452         void __iomem *ptr;
 453         int err;
 454
 455         if (GEM_WARN_ON(!i915_vma_is_map_and_fenceable(vma))) {
 456                 err = -ENODEV;
 457                 goto err;
 458         }
 459
 460         GEM_BUG_ON(!i915_vma_is_ggtt(vma));
 461         GEM_BUG_ON(!i915_vma_is_bound(vma, I915_VMA_GLOBAL_BIND));
 462
 463         ptr = READ_ONCE(vma->iomap);
 464         if (ptr == NULL) {
 465                 ptr = io_mapping_map_wc(&i915_vm_to_ggtt(vma->vm)->iomap,
 466                                         vma->node.start,
 467                                         vma->node.size);
 468                 if (ptr == NULL) {
 469                         err = -ENOMEM;
 470                         goto err;
 471                 }
 472
 473                 if (unlikely(cmpxchg(&vma->iomap, NULL, ptr))) {
 474                         io_mapping_unmap(ptr);
 475                         ptr = vma->iomap;
 476                 }
 477         }
 478
 479         __i915_vma_pin(vma);
 480
 481         err = i915_vma_pin_fence(vma);
 482         if (err)
 483                 goto err_unpin;
 484
 485         i915_vma_set_ggtt_write(vma);
 486
 487         /* NB Access through the GTT requires the device to be awake. */
 488         return ptr;
 489
 490 err_unpin:
 491         __i915_vma_unpin(vma);
 492 err:
 493         return IO_ERR_PTR(err);
 494 }
 495
 496 void i915_vma_flush_writes(struct i915_vma *vma)
 497 {
 498         if (i915_vma_unset_ggtt_write(vma))
 499                 intel_gt_flush_ggtt_writes(vma->vm->gt);
 500 }
 501
 502 void i915_vma_unpin_iomap(struct i915_vma *vma)
 503 {
 504         GEM_BUG_ON(vma->iomap == NULL);
 505
 506         i915_vma_flush_writes(vma);
 507
 508         i915_vma_unpin_fence(vma);
 509         i915_vma_unpin(vma);
 510 }
 511
 512 void i915_vma_unpin_and_release(struct i915_vma **p_vma, unsigned int flags)
 513 {
 514         struct i915_vma *vma;
 515         struct drm_i915_gem_object *obj;
 516
 517         vma = fetch_and_zero(p_vma);
 518         if (!vma)
 519                 return;
 520
 521         obj = vma->obj;
 522         GEM_BUG_ON(!obj);
 523
 524         i915_vma_unpin(vma);
 525
 526         if (flags & I915_VMA_RELEASE_MAP)
 527                 i915_gem_object_unpin_map(obj);
 528
 529         i915_gem_object_put(obj);
 530 }
 531
 532 bool i915_vma_misplaced(const struct i915_vma *vma,
 533                         u64 size, u64 alignment, u64 flags)
 534 {
 535         if (!drm_mm_node_allocated(&vma->node))
 536                 return false;
 537
 538         if (test_bit(I915_VMA_ERROR_BIT, __i915_vma_flags(vma)))
 539                 return true;
 540
 541         if (vma->node.size < size)
 542                 return true;
 543
 544         GEM_BUG_ON(alignment && !is_power_of_2(alignment));
 545         if (alignment && !IS_ALIGNED(vma->node.start, alignment))
 546                 return true;
 547
 548         if (flags & PIN_MAPPABLE && !i915_vma_is_map_and_fenceable(vma))
 549                 return true;
 550
 551         if (flags & PIN_OFFSET_BIAS &&
 552             vma->node.start < (flags & PIN_OFFSET_MASK))
 553                 return true;
 554
 555         if (flags & PIN_OFFSET_FIXED &&
 556             vma->node.start != (flags & PIN_OFFSET_MASK))
 557                 return true;
 558
 559         return false;
 560 }
 561
 562 void __i915_vma_set_map_and_fenceable(struct i915_vma *vma)
 563 {
 564         bool mappable, fenceable;
 565
 566         GEM_BUG_ON(!i915_vma_is_ggtt(vma));
 567         GEM_BUG_ON(!vma->fence_size);
 568
 569         fenceable = (vma->node.size >= vma->fence_size &&
 570                      IS_ALIGNED(vma->node.start, vma->fence_alignment));
 571
 572         mappable = vma->node.start + vma->fence_size <= i915_vm_to_ggtt(vma->vm)->mappable_end;
 573
 574         if (mappable && fenceable)
 575                 set_bit(I915_VMA_CAN_FENCE_BIT, __i915_vma_flags(vma));
 576         else
 577                 clear_bit(I915_VMA_CAN_FENCE_BIT, __i915_vma_flags(vma));
 578 }
 579
 580 bool i915_gem_valid_gtt_space(struct i915_vma *vma, unsigned long color)
 581 {
 582         struct drm_mm_node *node = &vma->node;
 583         struct drm_mm_node *other;
 584
 585         /*
 586          * On some machines we have to be careful when putting differing types
 587          * of snoopable memory together to avoid the prefetcher crossing memory
 588          * domains and dying. During vm initialisation, we decide whether or not
 589          * these constraints apply and set the drm_mm.color_adjust
 590          * appropriately.
 591          */
 592         if (!i915_vm_has_cache_coloring(vma->vm))
 593                 return true;
 594
 595         /* Only valid to be called on an already inserted vma */
 596         GEM_BUG_ON(!drm_mm_node_allocated(node));
 597         GEM_BUG_ON(list_empty(&node->node_list));
 598
 599         other = list_prev_entry(node, node_list);
 600         if (i915_node_color_differs(other, color) &&
 601             !drm_mm_hole_follows(other))
 602                 return false;
 603
 604         other = list_next_entry(node, node_list);
 605         if (i915_node_color_differs(other, color) &&
 606             !drm_mm_hole_follows(node))
 607                 return false;
 608
 609         return true;
 610 }
 611
 612 /**
 613  * i915_vma_insert - finds a slot for the vma in its address space
 614  * @vma: the vma
 615  * @size: requested size in bytes (can be larger than the VMA)
 616  * @alignment: required alignment
 617  * @flags: mask of PIN_* flags to use
 618  *
 619  * First we try to allocate some free space that meets the requirements for
 620  * the VMA. Failiing that, if the flags permit, it will evict an old VMA,
 621  * preferrably the oldest idle entry to make room for the new VMA.
 622  *
 623  * Returns:
 624  * 0 on success, negative error code otherwise.
 625  */
 626 static int
 627 i915_vma_insert(struct i915_vma *vma, u64 size, u64 alignment, u64 flags)
 628 {
 629         unsigned long color;
 630         u64 start, end;
 631         int ret;
 632
 633         GEM_BUG_ON(i915_vma_is_bound(vma, I915_VMA_GLOBAL_BIND | I915_VMA_LOCAL_BIND));
 634         GEM_BUG_ON(drm_mm_node_allocated(&vma->node));
 635
 636         size = max(size, vma->size);
 637         alignment = max(alignment, vma->display_alignment);
 638         if (flags & PIN_MAPPABLE) {
 639                 size = max_t(typeof(size), size, vma->fence_size);
 640                 alignment = max_t(typeof(alignment),
 641                                   alignment, vma->fence_alignment);
 642         }
 643
 644         GEM_BUG_ON(!IS_ALIGNED(size, I915_GTT_PAGE_SIZE));
 645         GEM_BUG_ON(!IS_ALIGNED(alignment, I915_GTT_MIN_ALIGNMENT));
 646         GEM_BUG_ON(!is_power_of_2(alignment));
 647
 648         start = flags & PIN_OFFSET_BIAS ? flags & PIN_OFFSET_MASK : 0;
 649         GEM_BUG_ON(!IS_ALIGNED(start, I915_GTT_PAGE_SIZE));
 650
 651         end = vma->vm->total;
 652         if (flags & PIN_MAPPABLE)
 653                 end = min_t(u64, end, i915_vm_to_ggtt(vma->vm)->mappable_end);
 654         if (flags & PIN_ZONE_4G)
 655                 end = min_t(u64, end, (1ULL << 32) - I915_GTT_PAGE_SIZE);
 656         GEM_BUG_ON(!IS_ALIGNED(end, I915_GTT_PAGE_SIZE));
 657
 658         /* If binding the object/GGTT view requires more space than the entire
 659          * aperture has, reject it early before evicting everything in a vain
 660          * attempt to find space.
 661          */
 662         if (size > end) {
 663                 DRM_DEBUG("Attempting to bind an object larger than the aperture: request=%llu > %s aperture=%llu\n",
 664                           size, flags & PIN_MAPPABLE ? "mappable" : "total",
 665                           end);
 666                 return -ENOSPC;
 667         }
 668
 669         color = 0;
 670         if (vma->obj && i915_vm_has_cache_coloring(vma->vm))
 671                 color = vma->obj->cache_level;
 672
 673         if (flags & PIN_OFFSET_FIXED) {
 674                 u64 offset = flags & PIN_OFFSET_MASK;
 675                 if (!IS_ALIGNED(offset, alignment) ||
 676                     range_overflows(offset, size, end))
 677                         return -EINVAL;
 678
 679                 ret = i915_gem_gtt_reserve(vma->vm, &vma->node,
 680                                            size, offset, color,
 681                                            flags);
 682                 if (ret)
 683                         return ret;
 684         } else {
 685                 /*
 686                  * We only support huge gtt pages through the 48b PPGTT,
 687                  * however we also don't want to force any alignment for
 688                  * objects which need to be tightly packed into the low 32bits.
 689                  *
 690                  * Note that we assume that GGTT are limited to 4GiB for the
 691                  * forseeable future. See also i915_ggtt_offset().
 692                  */
 693                 if (upper_32_bits(end - 1) &&
 694                     vma->page_sizes.sg > I915_GTT_PAGE_SIZE) {
 695                         /*
 696                          * We can't mix 64K and 4K PTEs in the same page-table
 697                          * (2M block), and so to avoid the ugliness and
 698                          * complexity of coloring we opt for just aligning 64K
 699                          * objects to 2M.
 700                          */
 701                         u64 page_alignment =
 702                                 rounddown_pow_of_two(vma->page_sizes.sg |
 703                                                      I915_GTT_PAGE_SIZE_2M);
 704
 705                         /*
 706                          * Check we don't expand for the limited Global GTT
 707                          * (mappable aperture is even more precious!). This
 708                          * also checks that we exclude the aliasing-ppgtt.
 709                          */
 710                         GEM_BUG_ON(i915_vma_is_ggtt(vma));
 711
 712                         alignment = max(alignment, page_alignment);
 713
 714                         if (vma->page_sizes.sg & I915_GTT_PAGE_SIZE_64K)
 715                                 size = round_up(size, I915_GTT_PAGE_SIZE_2M);
 716                 }
 717
 718                 ret = i915_gem_gtt_insert(vma->vm, &vma->node,
 719                                           size, alignment, color,
 720                                           start, end, flags);
 721                 if (ret)
 722                         return ret;
 723
 724                 GEM_BUG_ON(vma->node.start < start);
 725                 GEM_BUG_ON(vma->node.start + vma->node.size > end);
 726         }
 727         GEM_BUG_ON(!drm_mm_node_allocated(&vma->node));
 728         GEM_BUG_ON(!i915_gem_valid_gtt_space(vma, color));
 729
 730         list_add_tail(&vma->vm_link, &vma->vm->bound_list);
 731
 732         return 0;
 733 }
 734
 735 static void
 736 i915_vma_detach(struct i915_vma *vma)
 737 {
 738         GEM_BUG_ON(!drm_mm_node_allocated(&vma->node));
 739         GEM_BUG_ON(i915_vma_is_bound(vma, I915_VMA_GLOBAL_BIND | I915_VMA_LOCAL_BIND));
 740
 741         /*
 742          * And finally now the object is completely decoupled from this
 743          * vma, we can drop its hold on the backing storage and allow
 744          * it to be reaped by the shrinker.
 745          */
 746         list_del(&vma->vm_link);
 747 }
 748
 749 static bool try_qad_pin(struct i915_vma *vma, unsigned int flags)
 750 {
 751         unsigned int bound;
 752         bool pinned = true;
 753
 754         bound = atomic_read(&vma->flags);
 755         do {
 756                 if (unlikely(flags & ~bound))
 757                         return false;
 758
 759                 if (unlikely(bound & (I915_VMA_OVERFLOW | I915_VMA_ERROR)))
 760                         return false;
 761
 762                 if (!(bound & I915_VMA_PIN_MASK))
 763                         goto unpinned;
 764
 765                 GEM_BUG_ON(((bound + 1) & I915_VMA_PIN_MASK) == 0);
 766         } while (!atomic_try_cmpxchg(&vma->flags, &bound, bound + 1));
 767
 768         return true;
 769
 770 unpinned:
 771         /*
 772          * If pin_count==0, but we are bound, check under the lock to avoid
 773          * racing with a concurrent i915_vma_unbind().
 774          */
 775         mutex_lock(&vma->vm->mutex);
 776         do {
 777                 if (unlikely(bound & (I915_VMA_OVERFLOW | I915_VMA_ERROR))) {
 778                         pinned = false;
 779                         break;
 780                 }
 781
 782                 if (unlikely(flags & ~bound)) {
 783                         pinned = false;
 784                         break;
 785                 }
 786         } while (!atomic_try_cmpxchg(&vma->flags, &bound, bound + 1));
 787         mutex_unlock(&vma->vm->mutex);
 788
 789         return pinned;
 790 }
 791
 792 static int vma_get_pages(struct i915_vma *vma)
 793 {
 794         int err = 0;
 795
 796         if (atomic_add_unless(&vma->pages_count, 1, 0))
 797                 return 0;
 798
 799         /* Allocations ahoy! */
 800         if (mutex_lock_interruptible(&vma->pages_mutex))
 801                 return -EINTR;
 802
 803         if (!atomic_read(&vma->pages_count)) {
 804                 if (vma->obj) {
 805                         err = i915_gem_object_pin_pages(vma->obj);
 806                         if (err)
 807                                 goto unlock;
 808                 }
 809
 810                 err = vma->ops->set_pages(vma);
 811                 if (err) {
 812                         if (vma->obj)
 813                                 i915_gem_object_unpin_pages(vma->obj);
 814                         goto unlock;
 815                 }
 816         }
 817         atomic_inc(&vma->pages_count);
 818
 819 unlock:
 820         mutex_unlock(&vma->pages_mutex);
 821
 822         return err;
 823 }
 824
 825 static void __vma_put_pages(struct i915_vma *vma, unsigned int count)
 826 {
 827         /* We allocate under vma_get_pages, so beware the shrinker */
 828         mutex_lock_nested(&vma->pages_mutex, SINGLE_DEPTH_NESTING);
 829         GEM_BUG_ON(atomic_read(&vma->pages_count) < count);
 830         if (atomic_sub_return(count, &vma->pages_count) == 0) {
 831                 vma->ops->clear_pages(vma);
 832                 GEM_BUG_ON(vma->pages);
 833                 if (vma->obj)
 834                         i915_gem_object_unpin_pages(vma->obj);
 835         }
 836         mutex_unlock(&vma->pages_mutex);
 837 }
 838
 839 static void vma_put_pages(struct i915_vma *vma)
 840 {
 841         if (atomic_add_unless(&vma->pages_count, -1, 1))
 842                 return;
 843
 844         __vma_put_pages(vma, 1);
 845 }
 846
 847 static void vma_unbind_pages(struct i915_vma *vma)
 848 {
 849         unsigned int count;
 850
 851         lockdep_assert_held(&vma->vm->mutex);
 852
 853         /* The upper portion of pages_count is the number of bindings */
 854         count = atomic_read(&vma->pages_count);
 855         count >>= I915_VMA_PAGES_BIAS;
 856         GEM_BUG_ON(!count);
 857
 858         __vma_put_pages(vma, count | count << I915_VMA_PAGES_BIAS);
 859 }
 860
 861 int i915_vma_pin(struct i915_vma *vma, u64 size, u64 alignment, u64 flags)
 862 {
 863         struct i915_vma_work *work = NULL;
 864         intel_wakeref_t wakeref = 0;
 865         unsigned int bound;
 866         int err;
 867
 868         BUILD_BUG_ON(PIN_GLOBAL != I915_VMA_GLOBAL_BIND);
 869         BUILD_BUG_ON(PIN_USER != I915_VMA_LOCAL_BIND);
 870
 871         GEM_BUG_ON(flags & PIN_UPDATE);
 872         GEM_BUG_ON(!(flags & (PIN_USER | PIN_GLOBAL)));
 873
 874         /* First try and grab the pin without rebinding the vma */
 875         if (try_qad_pin(vma, flags & I915_VMA_BIND_MASK))
 876                 return 0;
 877
 878         err = vma_get_pages(vma);
 879         if (err)
 880                 return err;
 881
 882         if (flags & vma->vm->bind_async_flags) {
 883                 work = i915_vma_work();
 884                 if (!work) {
 885                         err = -ENOMEM;
 886                         goto err_pages;
 887                 }
 888         }
 889
 890         if (flags & PIN_GLOBAL)
 891                 wakeref = intel_runtime_pm_get(&vma->vm->i915->runtime_pm);
 892
 893         /*
 894          * Differentiate between user/kernel vma inside the aliasing-ppgtt.
 895          *
 896          * We conflate the Global GTT with the user's vma when using the
 897          * aliasing-ppgtt, but it is still vitally important to try and
 898          * keep the use cases distinct. For example, userptr objects are
 899          * not allowed inside the Global GTT as that will cause lock
 900          * inversions when we have to evict them the mmu_notifier callbacks -
 901          * but they are allowed to be part of the user ppGTT which can never
 902          * be mapped. As such we try to give the distinct users of the same
 903          * mutex, distinct lockclasses [equivalent to how we keep i915_ggtt
 904          * and i915_ppgtt separate].
 905          *
 906          * NB this may cause us to mask real lock inversions -- while the
 907          * code is safe today, lockdep may not be able to spot future
 908          * transgressions.
 909          */
 910         err = mutex_lock_interruptible_nested(&vma->vm->mutex,
 911                                               !(flags & PIN_GLOBAL));
 912         if (err)
 913                 goto err_fence;
 914
 915         /* No more allocations allowed now we hold vm->mutex */
 916
 917         if (unlikely(i915_vma_is_closed(vma))) {
 918                 err = -ENOENT;
 919                 goto err_unlock;
 920         }
 921
 922         bound = atomic_read(&vma->flags);
 923         if (unlikely(bound & I915_VMA_ERROR)) {
 924                 err = -ENOMEM;
 925                 goto err_unlock;
 926         }
 927
 928         if (unlikely(!((bound + 1) & I915_VMA_PIN_MASK))) {
 929                 err = -EAGAIN; /* pins are meant to be fairly temporary */
 930                 goto err_unlock;
 931         }
 932
 933         if (unlikely(!(flags & ~bound & I915_VMA_BIND_MASK))) {
 934                 __i915_vma_pin(vma);
 935                 goto err_unlock;
 936         }
 937
 938         err = i915_active_acquire(&vma->active);
 939         if (err)
 940                 goto err_unlock;
 941
 942         if (!(bound & I915_VMA_BIND_MASK)) {
 943                 err = i915_vma_insert(vma, size, alignment, flags);
 944                 if (err)
 945                         goto err_active;
 946
 947                 if (i915_is_ggtt(vma->vm))
 948                         __i915_vma_set_map_and_fenceable(vma);
 949         }
 950
 951         GEM_BUG_ON(!vma->pages);
 952         err = i915_vma_bind(vma,
 953                             vma->obj ? vma->obj->cache_level : 0,
 954                             flags, work);
 955         if (err)
 956                 goto err_remove;
 957
 958         /* There should only be at most 2 active bindings (user, global) */
 959         GEM_BUG_ON(bound + I915_VMA_PAGES_ACTIVE < bound);
 960         atomic_add(I915_VMA_PAGES_ACTIVE, &vma->pages_count);
 961         list_move_tail(&vma->vm_link, &vma->vm->bound_list);
 962
 963         __i915_vma_pin(vma);
 964         GEM_BUG_ON(!i915_vma_is_pinned(vma));
 965         GEM_BUG_ON(!i915_vma_is_bound(vma, flags));
 966         GEM_BUG_ON(i915_vma_misplaced(vma, size, alignment, flags));
 967
 968 err_remove:
 969         if (!i915_vma_is_bound(vma, I915_VMA_BIND_MASK)) {
 970                 i915_vma_detach(vma);
 971                 drm_mm_remove_node(&vma->node);
 972         }
 973 err_active:
 974         i915_active_release(&vma->active);
 975 err_unlock:
 976         mutex_unlock(&vma->vm->mutex);
 977 err_fence:
 978         if (work)
 979                 dma_fence_work_commit_imm(&work->base);
 980         if (wakeref)
 981                 intel_runtime_pm_put(&vma->vm->i915->runtime_pm, wakeref);
 982 err_pages:
 983         vma_put_pages(vma);
 984         return err;
 985 }
 986
 987 static void flush_idle_contexts(struct intel_gt *gt)
 988 {
 989         struct intel_engine_cs *engine;
 990         enum intel_engine_id id;
 991
 992         for_each_engine(engine, gt, id)
 993                 intel_engine_flush_barriers(engine);
 994
 995         intel_gt_wait_for_idle(gt, MAX_SCHEDULE_TIMEOUT);
 996 }
 997
 998 int i915_ggtt_pin(struct i915_vma *vma, u32 align, unsigned int flags)
 999 {
1000         struct i915_address_space *vm = vma->vm;
1001         int err;
1002
1003         GEM_BUG_ON(!i915_vma_is_ggtt(vma));
1004
1005         do {
1006                 err = i915_vma_pin(vma, 0, align, flags | PIN_GLOBAL);
1007                 if (err != -ENOSPC) {
1008                         if (!err) {
1009                                 err = i915_vma_wait_for_bind(vma);
1010                                 if (err)
1011                                         i915_vma_unpin(vma);
1012                         }
1013                         return err;
1014                 }
1015
1016                 /* Unlike i915_vma_pin, we don't take no for an answer! */
1017                 flush_idle_contexts(vm->gt);
1018                 if (mutex_lock_interruptible(&vm->mutex) == 0) {
1019                         i915_gem_evict_vm(vm);
1020                         mutex_unlock(&vm->mutex);
1021                 }
1022         } while (1);
1023 }
1024
1025 static void __vma_close(struct i915_vma *vma, struct intel_gt *gt)
1026 {
1027         /*
1028          * We defer actually closing, unbinding and destroying the VMA until
1029          * the next idle point, or if the object is freed in the meantime. By
1030          * postponing the unbind, we allow for it to be resurrected by the
1031          * client, avoiding the work required to rebind the VMA. This is
1032          * advantageous for DRI, where the client/server pass objects
1033          * between themselves, temporarily opening a local VMA to the
1034          * object, and then closing it again. The same object is then reused
1035          * on the next frame (or two, depending on the depth of the swap queue)
1036          * causing us to rebind the VMA once more. This ends up being a lot
1037          * of wasted work for the steady state.
1038          */
1039         GEM_BUG_ON(i915_vma_is_closed(vma));
1040         list_add(&vma->closed_link, &gt->closed_vma);
1041 }
1042
1043 void i915_vma_close(struct i915_vma *vma)
1044 {
1045         struct intel_gt *gt = vma->vm->gt;
1046         unsigned long flags;
1047
1048         if (i915_vma_is_ggtt(vma))
1049                 return;
1050
1051         GEM_BUG_ON(!atomic_read(&vma->open_count));
1052         if (atomic_dec_and_lock_irqsave(&vma->open_count,
1053                                         &gt->closed_lock,
1054                                         flags)) {
1055                 __vma_close(vma, gt);
1056                 spin_unlock_irqrestore(&gt->closed_lock, flags);
1057         }
1058 }
1059
1060 static void __i915_vma_remove_closed(struct i915_vma *vma)
1061 {
1062         struct intel_gt *gt = vma->vm->gt;
1063
1064         spin_lock_irq(&gt->closed_lock);
1065         list_del_init(&vma->closed_link);
1066         spin_unlock_irq(&gt->closed_lock);
1067 }
1068
1069 void i915_vma_reopen(struct i915_vma *vma)
1070 {
1071         if (i915_vma_is_closed(vma))
1072                 __i915_vma_remove_closed(vma);
1073 }
1074
1075 void i915_vma_release(struct kref *ref)
1076 {
1077         struct i915_vma *vma = container_of(ref, typeof(*vma), ref);
1078
1079         if (drm_mm_node_allocated(&vma->node)) {
1080                 mutex_lock(&vma->vm->mutex);
1081                 atomic_and(~I915_VMA_PIN_MASK, &vma->flags);
1082                 WARN_ON(__i915_vma_unbind(vma));
1083                 mutex_unlock(&vma->vm->mutex);
1084                 GEM_BUG_ON(drm_mm_node_allocated(&vma->node));
1085         }
1086         GEM_BUG_ON(i915_vma_is_active(vma));
1087
1088         if (vma->obj) {
1089                 struct drm_i915_gem_object *obj = vma->obj;
1090
1091                 spin_lock(&obj->vma.lock);
1092                 list_del(&vma->obj_link);
1093                 rb_erase(&vma->obj_node, &obj->vma.tree);
1094                 spin_unlock(&obj->vma.lock);
1095         }
1096
1097         __i915_vma_remove_closed(vma);
1098         i915_vm_put(vma->vm);
1099
1100         i915_active_fini(&vma->active);
1101         i915_vma_free(vma);
1102 }
1103
1104 void i915_vma_parked(struct intel_gt *gt)
1105 {
1106         struct i915_vma *vma, *next;
1107         LIST_HEAD(closed);
1108
1109         spin_lock_irq(&gt->closed_lock);
1110         list_for_each_entry_safe(vma, next, &gt->closed_vma, closed_link) {
1111                 struct drm_i915_gem_object *obj = vma->obj;
1112                 struct i915_address_space *vm = vma->vm;
1113
1114                 /* XXX All to avoid keeping a reference on i915_vma itself */
1115
1116                 if (!kref_get_unless_zero(&obj->base.refcount))
1117                         continue;
1118
1119                 if (!i915_vm_tryopen(vm)) {
1120                         i915_gem_object_put(obj);
1121                         continue;
1122                 }
1123
1124                 list_move(&vma->closed_link, &closed);
1125         }
1126         spin_unlock_irq(&gt->closed_lock);
1127
1128         /* As the GT is held idle, no vma can be reopened as we destroy them */
1129         list_for_each_entry_safe(vma, next, &closed, closed_link) {
1130                 struct drm_i915_gem_object *obj = vma->obj;
1131                 struct i915_address_space *vm = vma->vm;
1132
1133                 INIT_LIST_HEAD(&vma->closed_link);
1134                 __i915_vma_put(vma);
1135
1136                 i915_gem_object_put(obj);
1137                 i915_vm_close(vm);
1138         }
1139 }
1140
1141 static void __i915_vma_iounmap(struct i915_vma *vma)
1142 {
1143         GEM_BUG_ON(i915_vma_is_pinned(vma));
1144
1145         if (vma->iomap == NULL)
1146                 return;
1147
1148         io_mapping_unmap(vma->iomap);
1149         vma->iomap = NULL;
1150 }
1151
1152 void i915_vma_revoke_mmap(struct i915_vma *vma)
1153 {
1154         struct drm_vma_offset_node *node;
1155         u64 vma_offset;
1156
1157         if (!i915_vma_has_userfault(vma))
1158                 return;
1159
1160         GEM_BUG_ON(!i915_vma_is_map_and_fenceable(vma));
1161         GEM_BUG_ON(!vma->obj->userfault_count);
1162
1163         node = &vma->mmo->vma_node;
1164         vma_offset = vma->ggtt_view.partial.offset << PAGE_SHIFT;
1165         unmap_mapping_range(vma->vm->i915->drm.anon_inode->i_mapping,
1166                             drm_vma_node_offset_addr(node) + vma_offset,
1167                             vma->size,
1168                             1);
1169
1170         i915_vma_unset_userfault(vma);
1171         if (!--vma->obj->userfault_count)
1172                 list_del(&vma->obj->userfault_link);
1173 }
1174
1175 int __i915_vma_move_to_active(struct i915_vma *vma, struct i915_request *rq)
1176 {
1177         int err;
1178
1179         GEM_BUG_ON(!i915_vma_is_pinned(vma));
1180
1181         /* Wait for the vma to be bound before we start! */
1182         err = i915_request_await_active(rq, &vma->active,
1183                                         I915_ACTIVE_AWAIT_EXCL);
1184         if (err)
1185                 return err;
1186
1187         return i915_active_add_request(&vma->active, rq);
1188 }
1189
1190 int i915_vma_move_to_active(struct i915_vma *vma,
1191                             struct i915_request *rq,
1192                             unsigned int flags)
1193 {
1194         struct drm_i915_gem_object *obj = vma->obj;
1195         int err;
1196
1197         assert_object_held(obj);
1198
1199         err = __i915_vma_move_to_active(vma, rq);
1200         if (unlikely(err))
1201                 return err;
1202
1203         if (flags & EXEC_OBJECT_WRITE) {
1204                 struct intel_frontbuffer *front;
1205
1206                 front = __intel_frontbuffer_get(obj);
1207                 if (unlikely(front)) {
1208                         if (intel_frontbuffer_invalidate(front, ORIGIN_CS))
1209                                 i915_active_add_request(&front->write, rq);
1210                         intel_frontbuffer_put(front);
1211                 }
1212
1213                 dma_resv_add_excl_fence(vma->resv, &rq->fence);
1214                 obj->write_domain = I915_GEM_DOMAIN_RENDER;
1215                 obj->read_domains = 0;
1216         } else {
1217                 err = dma_resv_reserve_shared(vma->resv, 1);
1218                 if (unlikely(err))
1219                         return err;
1220
1221                 dma_resv_add_shared_fence(vma->resv, &rq->fence);
1222                 obj->write_domain = 0;
1223         }
1224
1225         if (flags & EXEC_OBJECT_NEEDS_FENCE && vma->fence)
1226                 i915_active_add_request(&vma->fence->active, rq);
1227
1228         obj->read_domains |= I915_GEM_GPU_DOMAINS;
1229         obj->mm.dirty = true;
1230
1231         GEM_BUG_ON(!i915_vma_is_active(vma));
1232         return 0;
1233 }
1234
1235 int __i915_vma_unbind(struct i915_vma *vma)
1236 {
1237         int ret;
1238
1239         lockdep_assert_held(&vma->vm->mutex);
1240
1241         if (i915_vma_is_pinned(vma)) {
1242                 vma_print_allocator(vma, "is pinned");
1243                 return -EAGAIN;
1244         }
1245
1246         /*
1247          * After confirming that no one else is pinning this vma, wait for
1248          * any laggards who may have crept in during the wait (through
1249          * a residual pin skipping the vm->mutex) to complete.
1250          */
1251         ret = i915_vma_sync(vma);
1252         if (ret)
1253                 return ret;
1254
1255         if (!drm_mm_node_allocated(&vma->node))
1256                 return 0;
1257
1258         GEM_BUG_ON(i915_vma_is_pinned(vma));
1259         GEM_BUG_ON(i915_vma_is_active(vma));
1260
1261         if (i915_vma_is_map_and_fenceable(vma)) {
1262                 /* Force a pagefault for domain tracking on next user access */
1263                 i915_vma_revoke_mmap(vma);
1264
1265                 /*
1266                  * Check that we have flushed all writes through the GGTT
1267                  * before the unbind, other due to non-strict nature of those
1268                  * indirect writes they may end up referencing the GGTT PTE
1269                  * after the unbind.
1270                  *
1271                  * Note that we may be concurrently poking at the GGTT_WRITE
1272                  * bit from set-domain, as we mark all GGTT vma associated
1273                  * with an object. We know this is for another vma, as we
1274                  * are currently unbinding this one -- so if this vma will be
1275                  * reused, it will be refaulted and have its dirty bit set
1276                  * before the next write.
1277                  */
1278                 i915_vma_flush_writes(vma);
1279
1280                 /* release the fence reg _after_ flushing */
1281                 i915_vma_revoke_fence(vma);
1282
1283                 __i915_vma_iounmap(vma);
1284                 clear_bit(I915_VMA_CAN_FENCE_BIT, __i915_vma_flags(vma));
1285         }
1286         GEM_BUG_ON(vma->fence);
1287         GEM_BUG_ON(i915_vma_has_userfault(vma));
1288
1289         if (likely(atomic_read(&vma->vm->open))) {
1290                 trace_i915_vma_unbind(vma);
1291                 vma->ops->unbind_vma(vma);
1292         }
1293         atomic_and(~(I915_VMA_BIND_MASK | I915_VMA_ERROR | I915_VMA_GGTT_WRITE),
1294                    &vma->flags);
1295
1296         i915_vma_detach(vma);
1297         vma_unbind_pages(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         if (!drm_mm_node_allocated(&vma->node))
1310                 return 0;
1311
1312         /* Optimistic wait before taking the mutex */
1313         err = i915_vma_sync(vma);
1314         if (err)
1315                 goto out_rpm;
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 }