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 "i915_vma.h"
  26
  27 #include "i915_drv.h"
  28 #include "intel_ringbuffer.h"
  29 #include "intel_frontbuffer.h"
  30
  31 #include <drm/drm_gem.h>
  32
  33 static void
  34 i915_vma_retire(struct i915_gem_active *active,
  35                 struct drm_i915_gem_request *rq)
  36 {
  37         const unsigned int idx = rq->engine->id;
  38         struct i915_vma *vma =
  39                 container_of(active, struct i915_vma, last_read[idx]);
  40         struct drm_i915_gem_object *obj = vma->obj;
  41
  42         GEM_BUG_ON(!i915_vma_has_active_engine(vma, idx));
  43
  44         i915_vma_clear_active(vma, idx);
  45         if (i915_vma_is_active(vma))
  46                 return;
  47
  48         GEM_BUG_ON(!drm_mm_node_allocated(&vma->node));
  49         list_move_tail(&vma->vm_link, &vma->vm->inactive_list);
  50         if (unlikely(i915_vma_is_closed(vma) && !i915_vma_is_pinned(vma)))
  51                 WARN_ON(i915_vma_unbind(vma));
  52
  53         GEM_BUG_ON(!i915_gem_object_is_active(obj));
  54         if (--obj->active_count)
  55                 return;
  56
  57         /* Prune the shared fence arrays iff completely idle (inc. external) */
  58         if (reservation_object_trylock(obj->resv)) {
  59                 if (reservation_object_test_signaled_rcu(obj->resv, true))
  60                         reservation_object_add_excl_fence(obj->resv, NULL);
  61                 reservation_object_unlock(obj->resv);
  62         }
  63
  64         /* Bump our place on the bound list to keep it roughly in LRU order
  65          * so that we don't steal from recently used but inactive objects
  66          * (unless we are forced to ofc!)
  67          */
  68         spin_lock(&rq->i915->mm.obj_lock);
  69         if (obj->bind_count)
  70                 list_move_tail(&obj->mm.link, &rq->i915->mm.bound_list);
  71         spin_unlock(&rq->i915->mm.obj_lock);
  72
  73         obj->mm.dirty = true; /* be paranoid  */
  74
  75         if (i915_gem_object_has_active_reference(obj)) {
  76                 i915_gem_object_clear_active_reference(obj);
  77                 i915_gem_object_put(obj);
  78         }
  79 }
  80
  81 static struct i915_vma *
  82 vma_create(struct drm_i915_gem_object *obj,
  83            struct i915_address_space *vm,
  84            const struct i915_ggtt_view *view)
  85 {
  86         struct i915_vma *vma;
  87         struct rb_node *rb, **p;
  88         int i;
  89
  90         /* The aliasing_ppgtt should never be used directly! */
  91         GEM_BUG_ON(vm == &vm->i915->mm.aliasing_ppgtt->base);
  92
  93         vma = kmem_cache_zalloc(vm->i915->vmas, GFP_KERNEL);
  94         if (vma == NULL)
  95                 return ERR_PTR(-ENOMEM);
  96
  97         for (i = 0; i < ARRAY_SIZE(vma->last_read); i++)
  98                 init_request_active(&vma->last_read[i], i915_vma_retire);
  99         init_request_active(&vma->last_fence, NULL);
 100         vma->vm = vm;
 101         vma->obj = obj;
 102         vma->resv = obj->resv;
 103         vma->size = obj->base.size;
 104         vma->display_alignment = I915_GTT_MIN_ALIGNMENT;
 105
 106         if (view && view->type != I915_GGTT_VIEW_NORMAL) {
 107                 vma->ggtt_view = *view;
 108                 if (view->type == I915_GGTT_VIEW_PARTIAL) {
 109                         GEM_BUG_ON(range_overflows_t(u64,
 110                                                      view->partial.offset,
 111                                                      view->partial.size,
 112                                                      obj->base.size >> PAGE_SHIFT));
 113                         vma->size = view->partial.size;
 114                         vma->size <<= PAGE_SHIFT;
 115                         GEM_BUG_ON(vma->size >= obj->base.size);
 116                 } else if (view->type == I915_GGTT_VIEW_ROTATED) {
 117                         vma->size = intel_rotation_info_size(&view->rotated);
 118                         vma->size <<= PAGE_SHIFT;
 119                 }
 120         }
 121
 122         if (unlikely(vma->size > vm->total))
 123                 goto err_vma;
 124
 125         GEM_BUG_ON(!IS_ALIGNED(vma->size, I915_GTT_PAGE_SIZE));
 126
 127         if (i915_is_ggtt(vm)) {
 128                 if (unlikely(overflows_type(vma->size, u32)))
 129                         goto err_vma;
 130
 131                 vma->fence_size = i915_gem_fence_size(vm->i915, vma->size,
 132                                                       i915_gem_object_get_tiling(obj),
 133                                                       i915_gem_object_get_stride(obj));
 134                 if (unlikely(vma->fence_size < vma->size || /* overflow */
 135                              vma->fence_size > vm->total))
 136                         goto err_vma;
 137
 138                 GEM_BUG_ON(!IS_ALIGNED(vma->fence_size, I915_GTT_MIN_ALIGNMENT));
 139
 140                 vma->fence_alignment = i915_gem_fence_alignment(vm->i915, vma->size,
 141                                                                 i915_gem_object_get_tiling(obj),
 142                                                                 i915_gem_object_get_stride(obj));
 143                 GEM_BUG_ON(!is_power_of_2(vma->fence_alignment));
 144
 145                 vma->flags |= I915_VMA_GGTT;
 146                 list_add(&vma->obj_link, &obj->vma_list);
 147         } else {
 148                 i915_ppgtt_get(i915_vm_to_ppgtt(vm));
 149                 list_add_tail(&vma->obj_link, &obj->vma_list);
 150         }
 151
 152         rb = NULL;
 153         p = &obj->vma_tree.rb_node;
 154         while (*p) {
 155                 struct i915_vma *pos;
 156
 157                 rb = *p;
 158                 pos = rb_entry(rb, struct i915_vma, obj_node);
 159                 if (i915_vma_compare(pos, vm, view) < 0)
 160                         p = &rb->rb_right;
 161                 else
 162                         p = &rb->rb_left;
 163         }
 164         rb_link_node(&vma->obj_node, rb, p);
 165         rb_insert_color(&vma->obj_node, &obj->vma_tree);
 166         list_add(&vma->vm_link, &vm->unbound_list);
 167
 168         return vma;
 169
 170 err_vma:
 171         kmem_cache_free(vm->i915->vmas, vma);
 172         return ERR_PTR(-E2BIG);
 173 }
 174
 175 static struct i915_vma *
 176 vma_lookup(struct drm_i915_gem_object *obj,
 177            struct i915_address_space *vm,
 178            const struct i915_ggtt_view *view)
 179 {
 180         struct rb_node *rb;
 181
 182         rb = obj->vma_tree.rb_node;
 183         while (rb) {
 184                 struct i915_vma *vma = rb_entry(rb, struct i915_vma, obj_node);
 185                 long cmp;
 186
 187                 cmp = i915_vma_compare(vma, vm, view);
 188                 if (cmp == 0)
 189                         return vma;
 190
 191                 if (cmp < 0)
 192                         rb = rb->rb_right;
 193                 else
 194                         rb = rb->rb_left;
 195         }
 196
 197         return NULL;
 198 }
 199
 200 /**
 201  * i915_vma_instance - return the singleton instance of the VMA
 202  * @obj: parent &struct drm_i915_gem_object to be mapped
 203  * @vm: address space in which the mapping is located
 204  * @view: additional mapping requirements
 205  *
 206  * i915_vma_instance() looks up an existing VMA of the @obj in the @vm with
 207  * the same @view characteristics. If a match is not found, one is created.
 208  * Once created, the VMA is kept until either the object is freed, or the
 209  * address space is closed.
 210  *
 211  * Must be called with struct_mutex held.
 212  *
 213  * Returns the vma, or an error pointer.
 214  */
 215 struct i915_vma *
 216 i915_vma_instance(struct drm_i915_gem_object *obj,
 217                   struct i915_address_space *vm,
 218                   const struct i915_ggtt_view *view)
 219 {
 220         struct i915_vma *vma;
 221
 222         lockdep_assert_held(&obj->base.dev->struct_mutex);
 223         GEM_BUG_ON(view && !i915_is_ggtt(vm));
 224         GEM_BUG_ON(vm->closed);
 225
 226         vma = vma_lookup(obj, vm, view);
 227         if (!vma)
 228                 vma = vma_create(obj, vm, view);
 229
 230         GEM_BUG_ON(!IS_ERR(vma) && i915_vma_is_closed(vma));
 231         GEM_BUG_ON(!IS_ERR(vma) && i915_vma_compare(vma, vm, view));
 232         GEM_BUG_ON(!IS_ERR(vma) && vma_lookup(obj, vm, view) != vma);
 233         return vma;
 234 }
 235
 236 /**
 237  * i915_vma_bind - Sets up PTEs for an VMA in it's corresponding address space.
 238  * @vma: VMA to map
 239  * @cache_level: mapping cache level
 240  * @flags: flags like global or local mapping
 241  *
 242  * DMA addresses are taken from the scatter-gather table of this object (or of
 243  * this VMA in case of non-default GGTT views) and PTE entries set up.
 244  * Note that DMA addresses are also the only part of the SG table we care about.
 245  */
 246 int i915_vma_bind(struct i915_vma *vma, enum i915_cache_level cache_level,
 247                   u32 flags)
 248 {
 249         u32 bind_flags;
 250         u32 vma_flags;
 251         int ret;
 252
 253         GEM_BUG_ON(!drm_mm_node_allocated(&vma->node));
 254         GEM_BUG_ON(vma->size > vma->node.size);
 255
 256         if (GEM_WARN_ON(range_overflows(vma->node.start,
 257                                         vma->node.size,
 258                                         vma->vm->total)))
 259                 return -ENODEV;
 260
 261         if (GEM_WARN_ON(!flags))
 262                 return -EINVAL;
 263
 264         bind_flags = 0;
 265         if (flags & PIN_GLOBAL)
 266                 bind_flags |= I915_VMA_GLOBAL_BIND;
 267         if (flags & PIN_USER)
 268                 bind_flags |= I915_VMA_LOCAL_BIND;
 269
 270         vma_flags = vma->flags & (I915_VMA_GLOBAL_BIND | I915_VMA_LOCAL_BIND);
 271         if (flags & PIN_UPDATE)
 272                 bind_flags |= vma_flags;
 273         else
 274                 bind_flags &= ~vma_flags;
 275         if (bind_flags == 0)
 276                 return 0;
 277
 278         GEM_BUG_ON(!vma->pages);
 279
 280         trace_i915_vma_bind(vma, bind_flags);
 281         ret = vma->vm->bind_vma(vma, cache_level, bind_flags);
 282         if (ret)
 283                 return ret;
 284
 285         vma->flags |= bind_flags;
 286         return 0;
 287 }
 288
 289 void __iomem *i915_vma_pin_iomap(struct i915_vma *vma)
 290 {
 291         void __iomem *ptr;
 292         int err;
 293
 294         /* Access through the GTT requires the device to be awake. */
 295         assert_rpm_wakelock_held(vma->vm->i915);
 296
 297         lockdep_assert_held(&vma->vm->i915->drm.struct_mutex);
 298         if (WARN_ON(!i915_vma_is_map_and_fenceable(vma))) {
 299                 err = -ENODEV;
 300                 goto err;
 301         }
 302
 303         GEM_BUG_ON(!i915_vma_is_ggtt(vma));
 304         GEM_BUG_ON((vma->flags & I915_VMA_GLOBAL_BIND) == 0);
 305
 306         ptr = vma->iomap;
 307         if (ptr == NULL) {
 308                 ptr = io_mapping_map_wc(&i915_vm_to_ggtt(vma->vm)->mappable,
 309                                         vma->node.start,
 310                                         vma->node.size);
 311                 if (ptr == NULL) {
 312                         err = -ENOMEM;
 313                         goto err;
 314                 }
 315
 316                 vma->iomap = ptr;
 317         }
 318
 319         __i915_vma_pin(vma);
 320
 321         err = i915_vma_pin_fence(vma);
 322         if (err)
 323                 goto err_unpin;
 324
 325         return ptr;
 326
 327 err_unpin:
 328         __i915_vma_unpin(vma);
 329 err:
 330         return IO_ERR_PTR(err);
 331 }
 332
 333 void i915_vma_unpin_iomap(struct i915_vma *vma)
 334 {
 335         lockdep_assert_held(&vma->obj->base.dev->struct_mutex);
 336
 337         GEM_BUG_ON(vma->iomap == NULL);
 338
 339         i915_vma_unpin_fence(vma);
 340         i915_vma_unpin(vma);
 341 }
 342
 343 void i915_vma_unpin_and_release(struct i915_vma **p_vma)
 344 {
 345         struct i915_vma *vma;
 346         struct drm_i915_gem_object *obj;
 347
 348         vma = fetch_and_zero(p_vma);
 349         if (!vma)
 350                 return;
 351
 352         obj = vma->obj;
 353
 354         i915_vma_unpin(vma);
 355         i915_vma_close(vma);
 356
 357         __i915_gem_object_release_unless_active(obj);
 358 }
 359
 360 bool i915_vma_misplaced(const struct i915_vma *vma,
 361                         u64 size, u64 alignment, u64 flags)
 362 {
 363         if (!drm_mm_node_allocated(&vma->node))
 364                 return false;
 365
 366         if (vma->node.size < size)
 367                 return true;
 368
 369         GEM_BUG_ON(alignment && !is_power_of_2(alignment));
 370         if (alignment && !IS_ALIGNED(vma->node.start, alignment))
 371                 return true;
 372
 373         if (flags & PIN_MAPPABLE && !i915_vma_is_map_and_fenceable(vma))
 374                 return true;
 375
 376         if (flags & PIN_OFFSET_BIAS &&
 377             vma->node.start < (flags & PIN_OFFSET_MASK))
 378                 return true;
 379
 380         if (flags & PIN_OFFSET_FIXED &&
 381             vma->node.start != (flags & PIN_OFFSET_MASK))
 382                 return true;
 383
 384         return false;
 385 }
 386
 387 void __i915_vma_set_map_and_fenceable(struct i915_vma *vma)
 388 {
 389         bool mappable, fenceable;
 390
 391         GEM_BUG_ON(!i915_vma_is_ggtt(vma));
 392         GEM_BUG_ON(!vma->fence_size);
 393
 394         /*
 395          * Explicitly disable for rotated VMA since the display does not
 396          * need the fence and the VMA is not accessible to other users.
 397          */
 398         if (vma->ggtt_view.type == I915_GGTT_VIEW_ROTATED)
 399                 return;
 400
 401         fenceable = (vma->node.size >= vma->fence_size &&
 402                      IS_ALIGNED(vma->node.start, vma->fence_alignment));
 403
 404         mappable = vma->node.start + vma->fence_size <= i915_vm_to_ggtt(vma->vm)->mappable_end;
 405
 406         if (mappable && fenceable)
 407                 vma->flags |= I915_VMA_CAN_FENCE;
 408         else
 409                 vma->flags &= ~I915_VMA_CAN_FENCE;
 410 }
 411
 412 static bool color_differs(struct drm_mm_node *node, unsigned long color)
 413 {
 414         return node->allocated && node->color != color;
 415 }
 416
 417 bool i915_gem_valid_gtt_space(struct i915_vma *vma, unsigned long cache_level)
 418 {
 419         struct drm_mm_node *node = &vma->node;
 420         struct drm_mm_node *other;
 421
 422         /*
 423          * On some machines we have to be careful when putting differing types
 424          * of snoopable memory together to avoid the prefetcher crossing memory
 425          * domains and dying. During vm initialisation, we decide whether or not
 426          * these constraints apply and set the drm_mm.color_adjust
 427          * appropriately.
 428          */
 429         if (vma->vm->mm.color_adjust == NULL)
 430                 return true;
 431
 432         /* Only valid to be called on an already inserted vma */
 433         GEM_BUG_ON(!drm_mm_node_allocated(node));
 434         GEM_BUG_ON(list_empty(&node->node_list));
 435
 436         other = list_prev_entry(node, node_list);
 437         if (color_differs(other, cache_level) && !drm_mm_hole_follows(other))
 438                 return false;
 439
 440         other = list_next_entry(node, node_list);
 441         if (color_differs(other, cache_level) && !drm_mm_hole_follows(node))
 442                 return false;
 443
 444         return true;
 445 }
 446
 447 /**
 448  * i915_vma_insert - finds a slot for the vma in its address space
 449  * @vma: the vma
 450  * @size: requested size in bytes (can be larger than the VMA)
 451  * @alignment: required alignment
 452  * @flags: mask of PIN_* flags to use
 453  *
 454  * First we try to allocate some free space that meets the requirements for
 455  * the VMA. Failiing that, if the flags permit, it will evict an old VMA,
 456  * preferrably the oldest idle entry to make room for the new VMA.
 457  *
 458  * Returns:
 459  * 0 on success, negative error code otherwise.
 460  */
 461 static int
 462 i915_vma_insert(struct i915_vma *vma, u64 size, u64 alignment, u64 flags)
 463 {
 464         struct drm_i915_private *dev_priv = vma->vm->i915;
 465         struct drm_i915_gem_object *obj = vma->obj;
 466         u64 start, end;
 467         int ret;
 468
 469         GEM_BUG_ON(vma->flags & (I915_VMA_GLOBAL_BIND | I915_VMA_LOCAL_BIND));
 470         GEM_BUG_ON(drm_mm_node_allocated(&vma->node));
 471
 472         size = max(size, vma->size);
 473         alignment = max(alignment, vma->display_alignment);
 474         if (flags & PIN_MAPPABLE) {
 475                 size = max_t(typeof(size), size, vma->fence_size);
 476                 alignment = max_t(typeof(alignment),
 477                                   alignment, vma->fence_alignment);
 478         }
 479
 480         GEM_BUG_ON(!IS_ALIGNED(size, I915_GTT_PAGE_SIZE));
 481         GEM_BUG_ON(!IS_ALIGNED(alignment, I915_GTT_MIN_ALIGNMENT));
 482         GEM_BUG_ON(!is_power_of_2(alignment));
 483
 484         start = flags & PIN_OFFSET_BIAS ? flags & PIN_OFFSET_MASK : 0;
 485         GEM_BUG_ON(!IS_ALIGNED(start, I915_GTT_PAGE_SIZE));
 486
 487         end = vma->vm->total;
 488         if (flags & PIN_MAPPABLE)
 489                 end = min_t(u64, end, dev_priv->ggtt.mappable_end);
 490         if (flags & PIN_ZONE_4G)
 491                 end = min_t(u64, end, (1ULL << 32) - I915_GTT_PAGE_SIZE);
 492         GEM_BUG_ON(!IS_ALIGNED(end, I915_GTT_PAGE_SIZE));
 493
 494         /* If binding the object/GGTT view requires more space than the entire
 495          * aperture has, reject it early before evicting everything in a vain
 496          * attempt to find space.
 497          */
 498         if (size > end) {
 499                 DRM_DEBUG("Attempting to bind an object larger than the aperture: request=%llu [object=%zd] > %s aperture=%llu\n",
 500                           size, obj->base.size,
 501                           flags & PIN_MAPPABLE ? "mappable" : "total",
 502                           end);
 503                 return -ENOSPC;
 504         }
 505
 506         ret = i915_gem_object_pin_pages(obj);
 507         if (ret)
 508                 return ret;
 509
 510         GEM_BUG_ON(vma->pages);
 511
 512         ret = vma->vm->set_pages(vma);
 513         if (ret)
 514                 goto err_unpin;
 515
 516         if (flags & PIN_OFFSET_FIXED) {
 517                 u64 offset = flags & PIN_OFFSET_MASK;
 518                 if (!IS_ALIGNED(offset, alignment) ||
 519                     range_overflows(offset, size, end)) {
 520                         ret = -EINVAL;
 521                         goto err_clear;
 522                 }
 523
 524                 ret = i915_gem_gtt_reserve(vma->vm, &vma->node,
 525                                            size, offset, obj->cache_level,
 526                                            flags);
 527                 if (ret)
 528                         goto err_clear;
 529         } else {
 530                 /*
 531                  * We only support huge gtt pages through the 48b PPGTT,
 532                  * however we also don't want to force any alignment for
 533                  * objects which need to be tightly packed into the low 32bits.
 534                  *
 535                  * Note that we assume that GGTT are limited to 4GiB for the
 536                  * forseeable future. See also i915_ggtt_offset().
 537                  */
 538                 if (upper_32_bits(end - 1) &&
 539                     vma->page_sizes.sg > I915_GTT_PAGE_SIZE) {
 540                         /*
 541                          * We can't mix 64K and 4K PTEs in the same page-table
 542                          * (2M block), and so to avoid the ugliness and
 543                          * complexity of coloring we opt for just aligning 64K
 544                          * objects to 2M.
 545                          */
 546                         u64 page_alignment =
 547                                 rounddown_pow_of_two(vma->page_sizes.sg |
 548                                                      I915_GTT_PAGE_SIZE_2M);
 549
 550                         /*
 551                          * Check we don't expand for the limited Global GTT
 552                          * (mappable aperture is even more precious!). This
 553                          * also checks that we exclude the aliasing-ppgtt.
 554                          */
 555                         GEM_BUG_ON(i915_vma_is_ggtt(vma));
 556
 557                         alignment = max(alignment, page_alignment);
 558
 559                         if (vma->page_sizes.sg & I915_GTT_PAGE_SIZE_64K)
 560                                 size = round_up(size, I915_GTT_PAGE_SIZE_2M);
 561                 }
 562
 563                 ret = i915_gem_gtt_insert(vma->vm, &vma->node,
 564                                           size, alignment, obj->cache_level,
 565                                           start, end, flags);
 566                 if (ret)
 567                         goto err_clear;
 568
 569                 GEM_BUG_ON(vma->node.start < start);
 570                 GEM_BUG_ON(vma->node.start + vma->node.size > end);
 571         }
 572         GEM_BUG_ON(!drm_mm_node_allocated(&vma->node));
 573         GEM_BUG_ON(!i915_gem_valid_gtt_space(vma, obj->cache_level));
 574
 575         list_move_tail(&vma->vm_link, &vma->vm->inactive_list);
 576
 577         spin_lock(&dev_priv->mm.obj_lock);
 578         list_move_tail(&obj->mm.link, &dev_priv->mm.bound_list);
 579         obj->bind_count++;
 580         spin_unlock(&dev_priv->mm.obj_lock);
 581
 582         GEM_BUG_ON(atomic_read(&obj->mm.pages_pin_count) < obj->bind_count);
 583
 584         return 0;
 585
 586 err_clear:
 587         vma->vm->clear_pages(vma);
 588 err_unpin:
 589         i915_gem_object_unpin_pages(obj);
 590         return ret;
 591 }
 592
 593 static void
 594 i915_vma_remove(struct i915_vma *vma)
 595 {
 596         struct drm_i915_private *i915 = vma->vm->i915;
 597         struct drm_i915_gem_object *obj = vma->obj;
 598
 599         GEM_BUG_ON(!drm_mm_node_allocated(&vma->node));
 600         GEM_BUG_ON(vma->flags & (I915_VMA_GLOBAL_BIND | I915_VMA_LOCAL_BIND));
 601
 602         vma->vm->clear_pages(vma);
 603
 604         drm_mm_remove_node(&vma->node);
 605         list_move_tail(&vma->vm_link, &vma->vm->unbound_list);
 606
 607         /* Since the unbound list is global, only move to that list if
 608          * no more VMAs exist.
 609          */
 610         spin_lock(&i915->mm.obj_lock);
 611         if (--obj->bind_count == 0)
 612                 list_move_tail(&obj->mm.link, &i915->mm.unbound_list);
 613         spin_unlock(&i915->mm.obj_lock);
 614
 615         /* And finally now the object is completely decoupled from this vma,
 616          * we can drop its hold on the backing storage and allow it to be
 617          * reaped by the shrinker.
 618          */
 619         i915_gem_object_unpin_pages(obj);
 620         GEM_BUG_ON(atomic_read(&obj->mm.pages_pin_count) < obj->bind_count);
 621 }
 622
 623 int __i915_vma_do_pin(struct i915_vma *vma,
 624                       u64 size, u64 alignment, u64 flags)
 625 {
 626         const unsigned int bound = vma->flags;
 627         int ret;
 628
 629         lockdep_assert_held(&vma->vm->i915->drm.struct_mutex);
 630         GEM_BUG_ON((flags & (PIN_GLOBAL | PIN_USER)) == 0);
 631         GEM_BUG_ON((flags & PIN_GLOBAL) && !i915_vma_is_ggtt(vma));
 632
 633         if (WARN_ON(bound & I915_VMA_PIN_OVERFLOW)) {
 634                 ret = -EBUSY;
 635                 goto err_unpin;
 636         }
 637
 638         if ((bound & I915_VMA_BIND_MASK) == 0) {
 639                 ret = i915_vma_insert(vma, size, alignment, flags);
 640                 if (ret)
 641                         goto err_unpin;
 642         }
 643
 644         ret = i915_vma_bind(vma, vma->obj->cache_level, flags);
 645         if (ret)
 646                 goto err_remove;
 647
 648         if ((bound ^ vma->flags) & I915_VMA_GLOBAL_BIND)
 649                 __i915_vma_set_map_and_fenceable(vma);
 650
 651         GEM_BUG_ON(!drm_mm_node_allocated(&vma->node));
 652         GEM_BUG_ON(i915_vma_misplaced(vma, size, alignment, flags));
 653         return 0;
 654
 655 err_remove:
 656         if ((bound & I915_VMA_BIND_MASK) == 0) {
 657                 i915_vma_remove(vma);
 658                 GEM_BUG_ON(vma->pages);
 659         }
 660 err_unpin:
 661         __i915_vma_unpin(vma);
 662         return ret;
 663 }
 664
 665 static void i915_vma_destroy(struct i915_vma *vma)
 666 {
 667         int i;
 668
 669         GEM_BUG_ON(vma->node.allocated);
 670         GEM_BUG_ON(i915_vma_is_active(vma));
 671         GEM_BUG_ON(!i915_vma_is_closed(vma));
 672         GEM_BUG_ON(vma->fence);
 673
 674         for (i = 0; i < ARRAY_SIZE(vma->last_read); i++)
 675                 GEM_BUG_ON(i915_gem_active_isset(&vma->last_read[i]));
 676         GEM_BUG_ON(i915_gem_active_isset(&vma->last_fence));
 677
 678         list_del(&vma->vm_link);
 679         if (!i915_vma_is_ggtt(vma))
 680                 i915_ppgtt_put(i915_vm_to_ppgtt(vma->vm));
 681
 682         kmem_cache_free(to_i915(vma->obj->base.dev)->vmas, vma);
 683 }
 684
 685 void i915_vma_close(struct i915_vma *vma)
 686 {
 687         GEM_BUG_ON(i915_vma_is_closed(vma));
 688         vma->flags |= I915_VMA_CLOSED;
 689
 690         list_del(&vma->obj_link);
 691         rb_erase(&vma->obj_node, &vma->obj->vma_tree);
 692
 693         if (!i915_vma_is_active(vma) && !i915_vma_is_pinned(vma))
 694                 WARN_ON(i915_vma_unbind(vma));
 695 }
 696
 697 static void __i915_vma_iounmap(struct i915_vma *vma)
 698 {
 699         GEM_BUG_ON(i915_vma_is_pinned(vma));
 700
 701         if (vma->iomap == NULL)
 702                 return;
 703
 704         io_mapping_unmap(vma->iomap);
 705         vma->iomap = NULL;
 706 }
 707
 708 void i915_vma_revoke_mmap(struct i915_vma *vma)
 709 {
 710         struct drm_vma_offset_node *node = &vma->obj->base.vma_node;
 711         u64 vma_offset;
 712
 713         lockdep_assert_held(&vma->vm->i915->drm.struct_mutex);
 714
 715         if (!i915_vma_has_userfault(vma))
 716                 return;
 717
 718         GEM_BUG_ON(!i915_vma_is_map_and_fenceable(vma));
 719         GEM_BUG_ON(!vma->obj->userfault_count);
 720
 721         vma_offset = vma->ggtt_view.partial.offset << PAGE_SHIFT;
 722         unmap_mapping_range(vma->vm->i915->drm.anon_inode->i_mapping,
 723                             drm_vma_node_offset_addr(node) + vma_offset,
 724                             vma->size,
 725                             1);
 726
 727         i915_vma_unset_userfault(vma);
 728         if (!--vma->obj->userfault_count)
 729                 list_del(&vma->obj->userfault_link);
 730 }
 731
 732 int i915_vma_unbind(struct i915_vma *vma)
 733 {
 734         struct drm_i915_gem_object *obj = vma->obj;
 735         unsigned long active;
 736         int ret;
 737
 738         lockdep_assert_held(&obj->base.dev->struct_mutex);
 739
 740         /* First wait upon any activity as retiring the request may
 741          * have side-effects such as unpinning or even unbinding this vma.
 742          */
 743         active = i915_vma_get_active(vma);
 744         if (active) {
 745                 int idx;
 746
 747                 /* When a closed VMA is retired, it is unbound - eek.
 748                  * In order to prevent it from being recursively closed,
 749                  * take a pin on the vma so that the second unbind is
 750                  * aborted.
 751                  *
 752                  * Even more scary is that the retire callback may free
 753                  * the object (last active vma). To prevent the explosion
 754                  * we defer the actual object free to a worker that can
 755                  * only proceed once it acquires the struct_mutex (which
 756                  * we currently hold, therefore it cannot free this object
 757                  * before we are finished).
 758                  */
 759                 __i915_vma_pin(vma);
 760
 761                 for_each_active(active, idx) {
 762                         ret = i915_gem_active_retire(&vma->last_read[idx],
 763                                                      &vma->vm->i915->drm.struct_mutex);
 764                         if (ret)
 765                                 break;
 766                 }
 767
 768                 if (!ret) {
 769                         ret = i915_gem_active_retire(&vma->last_fence,
 770                                                      &vma->vm->i915->drm.struct_mutex);
 771                 }
 772
 773                 __i915_vma_unpin(vma);
 774                 if (ret)
 775                         return ret;
 776         }
 777         GEM_BUG_ON(i915_vma_is_active(vma));
 778
 779         if (i915_vma_is_pinned(vma))
 780                 return -EBUSY;
 781
 782         if (!drm_mm_node_allocated(&vma->node))
 783                 goto destroy;
 784
 785         GEM_BUG_ON(obj->bind_count == 0);
 786         GEM_BUG_ON(!i915_gem_object_has_pinned_pages(obj));
 787
 788         if (i915_vma_is_map_and_fenceable(vma)) {
 789                 /* release the fence reg _after_ flushing */
 790                 ret = i915_vma_put_fence(vma);
 791                 if (ret)
 792                         return ret;
 793
 794                 /* Force a pagefault for domain tracking on next user access */
 795                 i915_vma_revoke_mmap(vma);
 796
 797                 __i915_vma_iounmap(vma);
 798                 vma->flags &= ~I915_VMA_CAN_FENCE;
 799         }
 800         GEM_BUG_ON(vma->fence);
 801         GEM_BUG_ON(i915_vma_has_userfault(vma));
 802
 803         if (likely(!vma->vm->closed)) {
 804                 trace_i915_vma_unbind(vma);
 805                 vma->vm->unbind_vma(vma);
 806         }
 807         vma->flags &= ~(I915_VMA_GLOBAL_BIND | I915_VMA_LOCAL_BIND);
 808
 809         i915_vma_remove(vma);
 810
 811 destroy:
 812         if (unlikely(i915_vma_is_closed(vma)))
 813                 i915_vma_destroy(vma);
 814
 815         return 0;
 816 }
 817
 818 #if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
 819 #include "selftests/i915_vma.c"
 820 #endif