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         i915_vma_close(vma);
 526
 527         if (flags & I915_VMA_RELEASE_MAP)
 528                 i915_gem_object_unpin_map(obj);
 529
 530         i915_gem_object_put(obj);
 531 }
 532
 533 bool i915_vma_misplaced(const struct i915_vma *vma,
 534                         u64 size, u64 alignment, u64 flags)
 535 {
 536         if (!drm_mm_node_allocated(&vma->node))
 537                 return false;
 538
 539         if (test_bit(I915_VMA_ERROR_BIT, __i915_vma_flags(vma)))
 540                 return true;
 541
 542         if (vma->node.size < size)
 543                 return true;
 544
 545         GEM_BUG_ON(alignment && !is_power_of_2(alignment));
 546         if (alignment && !IS_ALIGNED(vma->node.start, alignment))
 547                 return true;
 548
 549         if (flags & PIN_MAPPABLE && !i915_vma_is_map_and_fenceable(vma))
 550                 return true;
 551
 552         if (flags & PIN_OFFSET_BIAS &&
 553             vma->node.start < (flags & PIN_OFFSET_MASK))
 554                 return true;
 555
 556         if (flags & PIN_OFFSET_FIXED &&
 557             vma->node.start != (flags & PIN_OFFSET_MASK))
 558                 return true;
 559
 560         return false;
 561 }
 562
 563 void __i915_vma_set_map_and_fenceable(struct i915_vma *vma)
 564 {
 565         bool mappable, fenceable;
 566
 567         GEM_BUG_ON(!i915_vma_is_ggtt(vma));
 568         GEM_BUG_ON(!vma->fence_size);
 569
 570         fenceable = (vma->node.size >= vma->fence_size &&
 571                      IS_ALIGNED(vma->node.start, vma->fence_alignment));
 572
 573         mappable = vma->node.start + vma->fence_size <= i915_vm_to_ggtt(vma->vm)->mappable_end;
 574
 575         if (mappable && fenceable)
 576                 set_bit(I915_VMA_CAN_FENCE_BIT, __i915_vma_flags(vma));
 577         else
 578                 clear_bit(I915_VMA_CAN_FENCE_BIT, __i915_vma_flags(vma));
 579 }
 580
 581 bool i915_gem_valid_gtt_space(struct i915_vma *vma, unsigned long color)
 582 {
 583         struct drm_mm_node *node = &vma->node;
 584         struct drm_mm_node *other;
 585
 586         /*
 587          * On some machines we have to be careful when putting differing types
 588          * of snoopable memory together to avoid the prefetcher crossing memory
 589          * domains and dying. During vm initialisation, we decide whether or not
 590          * these constraints apply and set the drm_mm.color_adjust
 591          * appropriately.
 592          */
 593         if (!i915_vm_has_cache_coloring(vma->vm))
 594                 return true;
 595
 596         /* Only valid to be called on an already inserted vma */
 597         GEM_BUG_ON(!drm_mm_node_allocated(node));
 598         GEM_BUG_ON(list_empty(&node->node_list));
 599
 600         other = list_prev_entry(node, node_list);
 601         if (i915_node_color_differs(other, color) &&
 602             !drm_mm_hole_follows(other))
 603                 return false;
 604
 605         other = list_next_entry(node, node_list);
 606         if (i915_node_color_differs(other, color) &&
 607             !drm_mm_hole_follows(node))
 608                 return false;
 609
 610         return true;
 611 }
 612
 613 static void assert_bind_count(const struct drm_i915_gem_object *obj)
 614 {
 615         /*
 616          * Combine the assertion that the object is bound and that we have
 617          * pinned its pages. But we should never have bound the object
 618          * more than we have pinned its pages. (For complete accuracy, we
 619          * assume that no else is pinning the pages, but as a rough assertion
 620          * that we will not run into problems later, this will do!)
 621          */
 622         GEM_BUG_ON(atomic_read(&obj->mm.pages_pin_count) < atomic_read(&obj->bind_count));
 623 }
 624
 625 /**
 626  * i915_vma_insert - finds a slot for the vma in its address space
 627  * @vma: the vma
 628  * @size: requested size in bytes (can be larger than the VMA)
 629  * @alignment: required alignment
 630  * @flags: mask of PIN_* flags to use
 631  *
 632  * First we try to allocate some free space that meets the requirements for
 633  * the VMA. Failiing that, if the flags permit, it will evict an old VMA,
 634  * preferrably the oldest idle entry to make room for the new VMA.
 635  *
 636  * Returns:
 637  * 0 on success, negative error code otherwise.
 638  */
 639 static int
 640 i915_vma_insert(struct i915_vma *vma, u64 size, u64 alignment, u64 flags)
 641 {
 642         unsigned long color;
 643         u64 start, end;
 644         int ret;
 645
 646         GEM_BUG_ON(i915_vma_is_bound(vma, I915_VMA_GLOBAL_BIND | I915_VMA_LOCAL_BIND));
 647         GEM_BUG_ON(drm_mm_node_allocated(&vma->node));
 648
 649         size = max(size, vma->size);
 650         alignment = max(alignment, vma->display_alignment);
 651         if (flags & PIN_MAPPABLE) {
 652                 size = max_t(typeof(size), size, vma->fence_size);
 653                 alignment = max_t(typeof(alignment),
 654                                   alignment, vma->fence_alignment);
 655         }
 656
 657         GEM_BUG_ON(!IS_ALIGNED(size, I915_GTT_PAGE_SIZE));
 658         GEM_BUG_ON(!IS_ALIGNED(alignment, I915_GTT_MIN_ALIGNMENT));
 659         GEM_BUG_ON(!is_power_of_2(alignment));
 660
 661         start = flags & PIN_OFFSET_BIAS ? flags & PIN_OFFSET_MASK : 0;
 662         GEM_BUG_ON(!IS_ALIGNED(start, I915_GTT_PAGE_SIZE));
 663
 664         end = vma->vm->total;
 665         if (flags & PIN_MAPPABLE)
 666                 end = min_t(u64, end, i915_vm_to_ggtt(vma->vm)->mappable_end);
 667         if (flags & PIN_ZONE_4G)
 668                 end = min_t(u64, end, (1ULL << 32) - I915_GTT_PAGE_SIZE);
 669         GEM_BUG_ON(!IS_ALIGNED(end, I915_GTT_PAGE_SIZE));
 670
 671         /* If binding the object/GGTT view requires more space than the entire
 672          * aperture has, reject it early before evicting everything in a vain
 673          * attempt to find space.
 674          */
 675         if (size > end) {
 676                 DRM_DEBUG("Attempting to bind an object larger than the aperture: request=%llu > %s aperture=%llu\n",
 677                           size, flags & PIN_MAPPABLE ? "mappable" : "total",
 678                           end);
 679                 return -ENOSPC;
 680         }
 681
 682         color = 0;
 683         if (vma->obj && i915_vm_has_cache_coloring(vma->vm))
 684                 color = vma->obj->cache_level;
 685
 686         if (flags & PIN_OFFSET_FIXED) {
 687                 u64 offset = flags & PIN_OFFSET_MASK;
 688                 if (!IS_ALIGNED(offset, alignment) ||
 689                     range_overflows(offset, size, end))
 690                         return -EINVAL;
 691
 692                 ret = i915_gem_gtt_reserve(vma->vm, &vma->node,
 693                                            size, offset, color,
 694                                            flags);
 695                 if (ret)
 696                         return ret;
 697         } else {
 698                 /*
 699                  * We only support huge gtt pages through the 48b PPGTT,
 700                  * however we also don't want to force any alignment for
 701                  * objects which need to be tightly packed into the low 32bits.
 702                  *
 703                  * Note that we assume that GGTT are limited to 4GiB for the
 704                  * forseeable future. See also i915_ggtt_offset().
 705                  */
 706                 if (upper_32_bits(end - 1) &&
 707                     vma->page_sizes.sg > I915_GTT_PAGE_SIZE) {
 708                         /*
 709                          * We can't mix 64K and 4K PTEs in the same page-table
 710                          * (2M block), and so to avoid the ugliness and
 711                          * complexity of coloring we opt for just aligning 64K
 712                          * objects to 2M.
 713                          */
 714                         u64 page_alignment =
 715                                 rounddown_pow_of_two(vma->page_sizes.sg |
 716                                                      I915_GTT_PAGE_SIZE_2M);
 717
 718                         /*
 719                          * Check we don't expand for the limited Global GTT
 720                          * (mappable aperture is even more precious!). This
 721                          * also checks that we exclude the aliasing-ppgtt.
 722                          */
 723                         GEM_BUG_ON(i915_vma_is_ggtt(vma));
 724
 725                         alignment = max(alignment, page_alignment);
 726
 727                         if (vma->page_sizes.sg & I915_GTT_PAGE_SIZE_64K)
 728                                 size = round_up(size, I915_GTT_PAGE_SIZE_2M);
 729                 }
 730
 731                 ret = i915_gem_gtt_insert(vma->vm, &vma->node,
 732                                           size, alignment, color,
 733                                           start, end, flags);
 734                 if (ret)
 735                         return ret;
 736
 737                 GEM_BUG_ON(vma->node.start < start);
 738                 GEM_BUG_ON(vma->node.start + vma->node.size > end);
 739         }
 740         GEM_BUG_ON(!drm_mm_node_allocated(&vma->node));
 741         GEM_BUG_ON(!i915_gem_valid_gtt_space(vma, color));
 742
 743         if (vma->obj) {
 744                 struct drm_i915_gem_object *obj = vma->obj;
 745
 746                 atomic_inc(&obj->bind_count);
 747                 assert_bind_count(obj);
 748         }
 749         list_add_tail(&vma->vm_link, &vma->vm->bound_list);
 750
 751         return 0;
 752 }
 753
 754 static void
 755 i915_vma_detach(struct i915_vma *vma)
 756 {
 757         GEM_BUG_ON(!drm_mm_node_allocated(&vma->node));
 758         GEM_BUG_ON(i915_vma_is_bound(vma, I915_VMA_GLOBAL_BIND | I915_VMA_LOCAL_BIND));
 759
 760         /*
 761          * And finally now the object is completely decoupled from this
 762          * vma, we can drop its hold on the backing storage and allow
 763          * it to be reaped by the shrinker.
 764          */
 765         list_del(&vma->vm_link);
 766         if (vma->obj) {
 767                 struct drm_i915_gem_object *obj = vma->obj;
 768
 769                 assert_bind_count(obj);
 770                 atomic_dec(&obj->bind_count);
 771         }
 772 }
 773
 774 static bool try_qad_pin(struct i915_vma *vma, unsigned int flags)
 775 {
 776         unsigned int bound;
 777         bool pinned = true;
 778
 779         bound = atomic_read(&vma->flags);
 780         do {
 781                 if (unlikely(flags & ~bound))
 782                         return false;
 783
 784                 if (unlikely(bound & (I915_VMA_OVERFLOW | I915_VMA_ERROR)))
 785                         return false;
 786
 787                 if (!(bound & I915_VMA_PIN_MASK))
 788                         goto unpinned;
 789
 790                 GEM_BUG_ON(((bound + 1) & I915_VMA_PIN_MASK) == 0);
 791         } while (!atomic_try_cmpxchg(&vma->flags, &bound, bound + 1));
 792
 793         return true;
 794
 795 unpinned:
 796         /*
 797          * If pin_count==0, but we are bound, check under the lock to avoid
 798          * racing with a concurrent i915_vma_unbind().
 799          */
 800         mutex_lock(&vma->vm->mutex);
 801         do {
 802                 if (unlikely(bound & (I915_VMA_OVERFLOW | I915_VMA_ERROR))) {
 803                         pinned = false;
 804                         break;
 805                 }
 806
 807                 if (unlikely(flags & ~bound)) {
 808                         pinned = false;
 809                         break;
 810                 }
 811         } while (!atomic_try_cmpxchg(&vma->flags, &bound, bound + 1));
 812         mutex_unlock(&vma->vm->mutex);
 813
 814         return pinned;
 815 }
 816
 817 static int vma_get_pages(struct i915_vma *vma)
 818 {
 819         int err = 0;
 820
 821         if (atomic_add_unless(&vma->pages_count, 1, 0))
 822                 return 0;
 823
 824         /* Allocations ahoy! */
 825         if (mutex_lock_interruptible(&vma->pages_mutex))
 826                 return -EINTR;
 827
 828         if (!atomic_read(&vma->pages_count)) {
 829                 if (vma->obj) {
 830                         err = i915_gem_object_pin_pages(vma->obj);
 831                         if (err)
 832                                 goto unlock;
 833                 }
 834
 835                 err = vma->ops->set_pages(vma);
 836                 if (err) {
 837                         if (vma->obj)
 838                                 i915_gem_object_unpin_pages(vma->obj);
 839                         goto unlock;
 840                 }
 841         }
 842         atomic_inc(&vma->pages_count);
 843
 844 unlock:
 845         mutex_unlock(&vma->pages_mutex);
 846
 847         return err;
 848 }
 849
 850 static void __vma_put_pages(struct i915_vma *vma, unsigned int count)
 851 {
 852         /* We allocate under vma_get_pages, so beware the shrinker */
 853         mutex_lock_nested(&vma->pages_mutex, SINGLE_DEPTH_NESTING);
 854         GEM_BUG_ON(atomic_read(&vma->pages_count) < count);
 855         if (atomic_sub_return(count, &vma->pages_count) == 0) {
 856                 vma->ops->clear_pages(vma);
 857                 GEM_BUG_ON(vma->pages);
 858                 if (vma->obj)
 859                         i915_gem_object_unpin_pages(vma->obj);
 860         }
 861         mutex_unlock(&vma->pages_mutex);
 862 }
 863
 864 static void vma_put_pages(struct i915_vma *vma)
 865 {
 866         if (atomic_add_unless(&vma->pages_count, -1, 1))
 867                 return;
 868
 869         __vma_put_pages(vma, 1);
 870 }
 871
 872 static void vma_unbind_pages(struct i915_vma *vma)
 873 {
 874         unsigned int count;
 875
 876         lockdep_assert_held(&vma->vm->mutex);
 877
 878         /* The upper portion of pages_count is the number of bindings */
 879         count = atomic_read(&vma->pages_count);
 880         count >>= I915_VMA_PAGES_BIAS;
 881         GEM_BUG_ON(!count);
 882
 883         __vma_put_pages(vma, count | count << I915_VMA_PAGES_BIAS);
 884 }
 885
 886 int i915_vma_pin(struct i915_vma *vma, u64 size, u64 alignment, u64 flags)
 887 {
 888         struct i915_vma_work *work = NULL;
 889         intel_wakeref_t wakeref = 0;
 890         unsigned int bound;
 891         int err;
 892
 893         BUILD_BUG_ON(PIN_GLOBAL != I915_VMA_GLOBAL_BIND);
 894         BUILD_BUG_ON(PIN_USER != I915_VMA_LOCAL_BIND);
 895
 896         GEM_BUG_ON(flags & PIN_UPDATE);
 897         GEM_BUG_ON(!(flags & (PIN_USER | PIN_GLOBAL)));
 898
 899         /* First try and grab the pin without rebinding the vma */
 900         if (try_qad_pin(vma, flags & I915_VMA_BIND_MASK))
 901                 return 0;
 902
 903         err = vma_get_pages(vma);
 904         if (err)
 905                 return err;
 906
 907         if (flags & vma->vm->bind_async_flags) {
 908                 work = i915_vma_work();
 909                 if (!work) {
 910                         err = -ENOMEM;
 911                         goto err_pages;
 912                 }
 913         }
 914
 915         if (flags & PIN_GLOBAL)
 916                 wakeref = intel_runtime_pm_get(&vma->vm->i915->runtime_pm);
 917
 918         /* No more allocations allowed once we hold vm->mutex */
 919         err = mutex_lock_interruptible(&vma->vm->mutex);
 920         if (err)
 921                 goto err_fence;
 922
 923         if (unlikely(i915_vma_is_closed(vma))) {
 924                 err = -ENOENT;
 925                 goto err_unlock;
 926         }
 927
 928         bound = atomic_read(&vma->flags);
 929         if (unlikely(bound & I915_VMA_ERROR)) {
 930                 err = -ENOMEM;
 931                 goto err_unlock;
 932         }
 933
 934         if (unlikely(!((bound + 1) & I915_VMA_PIN_MASK))) {
 935                 err = -EAGAIN; /* pins are meant to be fairly temporary */
 936                 goto err_unlock;
 937         }
 938
 939         if (unlikely(!(flags & ~bound & I915_VMA_BIND_MASK))) {
 940                 __i915_vma_pin(vma);
 941                 goto err_unlock;
 942         }
 943
 944         err = i915_active_acquire(&vma->active);
 945         if (err)
 946                 goto err_unlock;
 947
 948         if (!(bound & I915_VMA_BIND_MASK)) {
 949                 err = i915_vma_insert(vma, size, alignment, flags);
 950                 if (err)
 951                         goto err_active;
 952
 953                 if (i915_is_ggtt(vma->vm))
 954                         __i915_vma_set_map_and_fenceable(vma);
 955         }
 956
 957         GEM_BUG_ON(!vma->pages);
 958         err = i915_vma_bind(vma,
 959                             vma->obj ? vma->obj->cache_level : 0,
 960                             flags, work);
 961         if (err)
 962                 goto err_remove;
 963
 964         /* There should only be at most 2 active bindings (user, global) */
 965         GEM_BUG_ON(bound + I915_VMA_PAGES_ACTIVE < bound);
 966         atomic_add(I915_VMA_PAGES_ACTIVE, &vma->pages_count);
 967         list_move_tail(&vma->vm_link, &vma->vm->bound_list);
 968
 969         __i915_vma_pin(vma);
 970         GEM_BUG_ON(!i915_vma_is_pinned(vma));
 971         GEM_BUG_ON(!i915_vma_is_bound(vma, flags));
 972         GEM_BUG_ON(i915_vma_misplaced(vma, size, alignment, flags));
 973
 974 err_remove:
 975         if (!i915_vma_is_bound(vma, I915_VMA_BIND_MASK)) {
 976                 i915_vma_detach(vma);
 977                 drm_mm_remove_node(&vma->node);
 978         }
 979 err_active:
 980         i915_active_release(&vma->active);
 981 err_unlock:
 982         mutex_unlock(&vma->vm->mutex);
 983 err_fence:
 984         if (work)
 985                 dma_fence_work_commit(&work->base);
 986         if (wakeref)
 987                 intel_runtime_pm_put(&vma->vm->i915->runtime_pm, wakeref);
 988 err_pages:
 989         vma_put_pages(vma);
 990         return err;
 991 }
 992
 993 static void flush_idle_contexts(struct intel_gt *gt)
 994 {
 995         struct intel_engine_cs *engine;
 996         enum intel_engine_id id;
 997
 998         for_each_engine(engine, gt, id)
 999                 intel_engine_flush_barriers(engine);
1000
1001         intel_gt_wait_for_idle(gt, MAX_SCHEDULE_TIMEOUT);
1002 }
1003
1004 int i915_ggtt_pin(struct i915_vma *vma, u32 align, unsigned int flags)
1005 {
1006         struct i915_address_space *vm = vma->vm;
1007         int err;
1008
1009         GEM_BUG_ON(!i915_vma_is_ggtt(vma));
1010
1011         do {
1012                 err = i915_vma_pin(vma, 0, align, flags | PIN_GLOBAL);
1013                 if (err != -ENOSPC) {
1014                         if (!err) {
1015                                 err = i915_vma_wait_for_bind(vma);
1016                                 if (err)
1017                                         i915_vma_unpin(vma);
1018                         }
1019                         return err;
1020                 }
1021
1022                 /* Unlike i915_vma_pin, we don't take no for an answer! */
1023                 flush_idle_contexts(vm->gt);
1024                 if (mutex_lock_interruptible(&vm->mutex) == 0) {
1025                         i915_gem_evict_vm(vm);
1026                         mutex_unlock(&vm->mutex);
1027                 }
1028         } while (1);
1029 }
1030
1031 void i915_vma_close(struct i915_vma *vma)
1032 {
1033         struct intel_gt *gt = vma->vm->gt;
1034         unsigned long flags;
1035
1036         GEM_BUG_ON(i915_vma_is_closed(vma));
1037
1038         /*
1039          * We defer actually closing, unbinding and destroying the VMA until
1040          * the next idle point, or if the object is freed in the meantime. By
1041          * postponing the unbind, we allow for it to be resurrected by the
1042          * client, avoiding the work required to rebind the VMA. This is
1043          * advantageous for DRI, where the client/server pass objects
1044          * between themselves, temporarily opening a local VMA to the
1045          * object, and then closing it again. The same object is then reused
1046          * on the next frame (or two, depending on the depth of the swap queue)
1047          * causing us to rebind the VMA once more. This ends up being a lot
1048          * of wasted work for the steady state.
1049          */
1050         spin_lock_irqsave(&gt->closed_lock, flags);
1051         list_add(&vma->closed_link, &gt->closed_vma);
1052         spin_unlock_irqrestore(&gt->closed_lock, flags);
1053 }
1054
1055 static void __i915_vma_remove_closed(struct i915_vma *vma)
1056 {
1057         struct intel_gt *gt = vma->vm->gt;
1058
1059         spin_lock_irq(&gt->closed_lock);
1060         list_del_init(&vma->closed_link);
1061         spin_unlock_irq(&gt->closed_lock);
1062 }
1063
1064 void i915_vma_reopen(struct i915_vma *vma)
1065 {
1066         if (i915_vma_is_closed(vma))
1067                 __i915_vma_remove_closed(vma);
1068 }
1069
1070 void i915_vma_release(struct kref *ref)
1071 {
1072         struct i915_vma *vma = container_of(ref, typeof(*vma), ref);
1073
1074         if (drm_mm_node_allocated(&vma->node)) {
1075                 mutex_lock(&vma->vm->mutex);
1076                 atomic_and(~I915_VMA_PIN_MASK, &vma->flags);
1077                 WARN_ON(__i915_vma_unbind(vma));
1078                 mutex_unlock(&vma->vm->mutex);
1079                 GEM_BUG_ON(drm_mm_node_allocated(&vma->node));
1080         }
1081         GEM_BUG_ON(i915_vma_is_active(vma));
1082
1083         if (vma->obj) {
1084                 struct drm_i915_gem_object *obj = vma->obj;
1085
1086                 spin_lock(&obj->vma.lock);
1087                 list_del(&vma->obj_link);
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, 0);
1178         if (err)
1179                 return err;
1180
1181         return i915_active_add_request(&vma->active, rq);
1182 }
1183
1184 int i915_vma_move_to_active(struct i915_vma *vma,
1185                             struct i915_request *rq,
1186                             unsigned int flags)
1187 {
1188         struct drm_i915_gem_object *obj = vma->obj;
1189         int err;
1190
1191         assert_object_held(obj);
1192
1193         err = __i915_vma_move_to_active(vma, rq);
1194         if (unlikely(err))
1195                 return err;
1196
1197         if (flags & EXEC_OBJECT_WRITE) {
1198                 struct intel_frontbuffer *front;
1199
1200                 front = __intel_frontbuffer_get(obj);
1201                 if (unlikely(front)) {
1202                         if (intel_frontbuffer_invalidate(front, ORIGIN_CS))
1203                                 i915_active_add_request(&front->write, rq);
1204                         intel_frontbuffer_put(front);
1205                 }
1206
1207                 dma_resv_add_excl_fence(vma->resv, &rq->fence);
1208                 obj->write_domain = I915_GEM_DOMAIN_RENDER;
1209                 obj->read_domains = 0;
1210         } else {
1211                 err = dma_resv_reserve_shared(vma->resv, 1);
1212                 if (unlikely(err))
1213                         return err;
1214
1215                 dma_resv_add_shared_fence(vma->resv, &rq->fence);
1216                 obj->write_domain = 0;
1217         }
1218         obj->read_domains |= I915_GEM_GPU_DOMAINS;
1219         obj->mm.dirty = true;
1220
1221         GEM_BUG_ON(!i915_vma_is_active(vma));
1222         return 0;
1223 }
1224
1225 int __i915_vma_unbind(struct i915_vma *vma)
1226 {
1227         int ret;
1228
1229         lockdep_assert_held(&vma->vm->mutex);
1230
1231         if (i915_vma_is_pinned(vma)) {
1232                 vma_print_allocator(vma, "is pinned");
1233                 return -EAGAIN;
1234         }
1235
1236         /*
1237          * After confirming that no one else is pinning this vma, wait for
1238          * any laggards who may have crept in during the wait (through
1239          * a residual pin skipping the vm->mutex) to complete.
1240          */
1241         ret = i915_vma_sync(vma);
1242         if (ret)
1243                 return ret;
1244
1245         if (!drm_mm_node_allocated(&vma->node))
1246                 return 0;
1247
1248         GEM_BUG_ON(i915_vma_is_pinned(vma));
1249         GEM_BUG_ON(i915_vma_is_active(vma));
1250
1251         if (i915_vma_is_map_and_fenceable(vma)) {
1252                 /*
1253                  * Check that we have flushed all writes through the GGTT
1254                  * before the unbind, other due to non-strict nature of those
1255                  * indirect writes they may end up referencing the GGTT PTE
1256                  * after the unbind.
1257                  *
1258                  * Note that we may be concurrently poking at the GGTT_WRITE
1259                  * bit from set-domain, as we mark all GGTT vma associated
1260                  * with an object. We know this is for another vma, as we
1261                  * are currently unbinding this one -- so if this vma will be
1262                  * reused, it will be refaulted and have its dirty bit set
1263                  * before the next write.
1264                  */
1265                 i915_vma_flush_writes(vma);
1266
1267                 /* release the fence reg _after_ flushing */
1268                 ret = i915_vma_revoke_fence(vma);
1269                 if (ret)
1270                         return ret;
1271
1272                 /* Force a pagefault for domain tracking on next user access */
1273                 i915_vma_revoke_mmap(vma);
1274
1275                 __i915_vma_iounmap(vma);
1276                 clear_bit(I915_VMA_CAN_FENCE_BIT, __i915_vma_flags(vma));
1277         }
1278         GEM_BUG_ON(vma->fence);
1279         GEM_BUG_ON(i915_vma_has_userfault(vma));
1280
1281         if (likely(atomic_read(&vma->vm->open))) {
1282                 trace_i915_vma_unbind(vma);
1283                 vma->ops->unbind_vma(vma);
1284         }
1285         atomic_and(~(I915_VMA_BIND_MASK | I915_VMA_ERROR | I915_VMA_GGTT_WRITE),
1286                    &vma->flags);
1287
1288         i915_vma_detach(vma);
1289         vma_unbind_pages(vma);
1290
1291         drm_mm_remove_node(&vma->node); /* pairs with i915_vma_release() */
1292         return 0;
1293 }
1294
1295 int i915_vma_unbind(struct i915_vma *vma)
1296 {
1297         struct i915_address_space *vm = vma->vm;
1298         intel_wakeref_t wakeref = 0;
1299         int err;
1300
1301         if (!drm_mm_node_allocated(&vma->node))
1302                 return 0;
1303
1304         /* Optimistic wait before taking the mutex */
1305         err = i915_vma_sync(vma);
1306         if (err)
1307                 goto out_rpm;
1308
1309         if (i915_vma_is_pinned(vma)) {
1310                 vma_print_allocator(vma, "is pinned");
1311                 return -EAGAIN;
1312         }
1313
1314         if (i915_vma_is_bound(vma, I915_VMA_GLOBAL_BIND))
1315                 /* XXX not always required: nop_clear_range */
1316                 wakeref = intel_runtime_pm_get(&vm->i915->runtime_pm);
1317
1318         err = mutex_lock_interruptible(&vm->mutex);
1319         if (err)
1320                 goto out_rpm;
1321
1322         err = __i915_vma_unbind(vma);
1323         mutex_unlock(&vm->mutex);
1324
1325 out_rpm:
1326         if (wakeref)
1327                 intel_runtime_pm_put(&vm->i915->runtime_pm, wakeref);
1328         return err;
1329 }
1330
1331 struct i915_vma *i915_vma_make_unshrinkable(struct i915_vma *vma)
1332 {
1333         i915_gem_object_make_unshrinkable(vma->obj);
1334         return vma;
1335 }
1336
1337 void i915_vma_make_shrinkable(struct i915_vma *vma)
1338 {
1339         i915_gem_object_make_shrinkable(vma->obj);
1340 }
1341
1342 void i915_vma_make_purgeable(struct i915_vma *vma)
1343 {
1344         i915_gem_object_make_purgeable(vma->obj);
1345 }
1346
1347 #if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
1348 #include "selftests/i915_vma.c"
1349 #endif
1350
1351 static void i915_global_vma_shrink(void)
1352 {
1353         kmem_cache_shrink(global.slab_vmas);
1354 }
1355
1356 static void i915_global_vma_exit(void)
1357 {
1358         kmem_cache_destroy(global.slab_vmas);
1359 }
1360
1361 static struct i915_global_vma global = { {
1362         .shrink = i915_global_vma_shrink,
1363         .exit = i915_global_vma_exit,
1364 } };
1365
1366 int __init i915_global_vma_init(void)
1367 {
1368         global.slab_vmas = KMEM_CACHE(i915_vma, SLAB_HWCACHE_ALIGN);
1369         if (!global.slab_vmas)
1370                 return -ENOMEM;
1371
1372         i915_global_register(&global.base);
1373         return 0;
1374 }