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         /* Bump our place on the bound list to keep it roughly in LRU order
  58          * so that we don't steal from recently used but inactive objects
  59          * (unless we are forced to ofc!)
  60          */
  61         if (obj->bind_count)
  62                 list_move_tail(&obj->global_link, &rq->i915->mm.bound_list);
  63
  64         obj->mm.dirty = true; /* be paranoid  */
  65
  66         if (i915_gem_object_has_active_reference(obj)) {
  67                 i915_gem_object_clear_active_reference(obj);
  68                 i915_gem_object_put(obj);
  69         }
  70 }
  71
  72 static struct i915_vma *
  73 vma_create(struct drm_i915_gem_object *obj,
  74            struct i915_address_space *vm,
  75            const struct i915_ggtt_view *view)
  76 {
  77         struct i915_vma *vma;
  78         struct rb_node *rb, **p;
  79         int i;
  80
  81         /* The aliasing_ppgtt should never be used directly! */
  82         GEM_BUG_ON(vm == &vm->i915->mm.aliasing_ppgtt->base);
  83
  84         vma = kmem_cache_zalloc(vm->i915->vmas, GFP_KERNEL);
  85         if (vma == NULL)
  86                 return ERR_PTR(-ENOMEM);
  87
  88         for (i = 0; i < ARRAY_SIZE(vma->last_read); i++)
  89                 init_request_active(&vma->last_read[i], i915_vma_retire);
  90         init_request_active(&vma->last_fence, NULL);
  91         vma->vm = vm;
  92         vma->obj = obj;
  93         vma->resv = obj->resv;
  94         vma->size = obj->base.size;
  95         vma->display_alignment = I915_GTT_MIN_ALIGNMENT;
  96
  97         if (view && view->type != I915_GGTT_VIEW_NORMAL) {
  98                 vma->ggtt_view = *view;
  99                 if (view->type == I915_GGTT_VIEW_PARTIAL) {
 100                         GEM_BUG_ON(range_overflows_t(u64,
 101                                                      view->partial.offset,
 102                                                      view->partial.size,
 103                                                      obj->base.size >> PAGE_SHIFT));
 104                         vma->size = view->partial.size;
 105                         vma->size <<= PAGE_SHIFT;
 106                         GEM_BUG_ON(vma->size >= obj->base.size);
 107                 } else if (view->type == I915_GGTT_VIEW_ROTATED) {
 108                         vma->size = intel_rotation_info_size(&view->rotated);
 109                         vma->size <<= PAGE_SHIFT;
 110                 }
 111         }
 112
 113         if (unlikely(vma->size > vm->total))
 114                 goto err_vma;
 115
 116         GEM_BUG_ON(!IS_ALIGNED(vma->size, I915_GTT_PAGE_SIZE));
 117
 118         if (i915_is_ggtt(vm)) {
 119                 if (unlikely(overflows_type(vma->size, u32)))
 120                         goto err_vma;
 121
 122                 vma->fence_size = i915_gem_fence_size(vm->i915, vma->size,
 123                                                       i915_gem_object_get_tiling(obj),
 124                                                       i915_gem_object_get_stride(obj));
 125                 if (unlikely(vma->fence_size < vma->size || /* overflow */
 126                              vma->fence_size > vm->total))
 127                         goto err_vma;
 128
 129                 GEM_BUG_ON(!IS_ALIGNED(vma->fence_size, I915_GTT_MIN_ALIGNMENT));
 130
 131                 vma->fence_alignment = i915_gem_fence_alignment(vm->i915, vma->size,
 132                                                                 i915_gem_object_get_tiling(obj),
 133                                                                 i915_gem_object_get_stride(obj));
 134                 GEM_BUG_ON(!is_power_of_2(vma->fence_alignment));
 135
 136                 vma->flags |= I915_VMA_GGTT;
 137                 list_add(&vma->obj_link, &obj->vma_list);
 138         } else {
 139                 i915_ppgtt_get(i915_vm_to_ppgtt(vm));
 140                 list_add_tail(&vma->obj_link, &obj->vma_list);
 141         }
 142
 143         rb = NULL;
 144         p = &obj->vma_tree.rb_node;
 145         while (*p) {
 146                 struct i915_vma *pos;
 147
 148                 rb = *p;
 149                 pos = rb_entry(rb, struct i915_vma, obj_node);
 150                 if (i915_vma_compare(pos, vm, view) < 0)
 151                         p = &rb->rb_right;
 152                 else
 153                         p = &rb->rb_left;
 154         }
 155         rb_link_node(&vma->obj_node, rb, p);
 156         rb_insert_color(&vma->obj_node, &obj->vma_tree);
 157         list_add(&vma->vm_link, &vm->unbound_list);
 158
 159         return vma;
 160
 161 err_vma:
 162         kmem_cache_free(vm->i915->vmas, vma);
 163         return ERR_PTR(-E2BIG);
 164 }
 165
 166 static struct i915_vma *
 167 vma_lookup(struct drm_i915_gem_object *obj,
 168            struct i915_address_space *vm,
 169            const struct i915_ggtt_view *view)
 170 {
 171         struct rb_node *rb;
 172
 173         rb = obj->vma_tree.rb_node;
 174         while (rb) {
 175                 struct i915_vma *vma = rb_entry(rb, struct i915_vma, obj_node);
 176                 long cmp;
 177
 178                 cmp = i915_vma_compare(vma, vm, view);
 179                 if (cmp == 0)
 180                         return vma;
 181
 182                 if (cmp < 0)
 183                         rb = rb->rb_right;
 184                 else
 185                         rb = rb->rb_left;
 186         }
 187
 188         return NULL;
 189 }
 190
 191 /**
 192  * i915_vma_instance - return the singleton instance of the VMA
 193  * @obj: parent &struct drm_i915_gem_object to be mapped
 194  * @vm: address space in which the mapping is located
 195  * @view: additional mapping requirements
 196  *
 197  * i915_vma_instance() looks up an existing VMA of the @obj in the @vm with
 198  * the same @view characteristics. If a match is not found, one is created.
 199  * Once created, the VMA is kept until either the object is freed, or the
 200  * address space is closed.
 201  *
 202  * Must be called with struct_mutex held.
 203  *
 204  * Returns the vma, or an error pointer.
 205  */
 206 struct i915_vma *
 207 i915_vma_instance(struct drm_i915_gem_object *obj,
 208                   struct i915_address_space *vm,
 209                   const struct i915_ggtt_view *view)
 210 {
 211         struct i915_vma *vma;
 212
 213         lockdep_assert_held(&obj->base.dev->struct_mutex);
 214         GEM_BUG_ON(view && !i915_is_ggtt(vm));
 215         GEM_BUG_ON(vm->closed);
 216
 217         vma = vma_lookup(obj, vm, view);
 218         if (!vma)
 219                 vma = vma_create(obj, vm, view);
 220
 221         GEM_BUG_ON(!IS_ERR(vma) && i915_vma_is_closed(vma));
 222         GEM_BUG_ON(!IS_ERR(vma) && i915_vma_compare(vma, vm, view));
 223         GEM_BUG_ON(!IS_ERR(vma) && vma_lookup(obj, vm, view) != vma);
 224         return vma;
 225 }
 226
 227 /**
 228  * i915_vma_bind - Sets up PTEs for an VMA in it's corresponding address space.
 229  * @vma: VMA to map
 230  * @cache_level: mapping cache level
 231  * @flags: flags like global or local mapping
 232  *
 233  * DMA addresses are taken from the scatter-gather table of this object (or of
 234  * this VMA in case of non-default GGTT views) and PTE entries set up.
 235  * Note that DMA addresses are also the only part of the SG table we care about.
 236  */
 237 int i915_vma_bind(struct i915_vma *vma, enum i915_cache_level cache_level,
 238                   u32 flags)
 239 {
 240         u32 bind_flags;
 241         u32 vma_flags;
 242         int ret;
 243
 244         GEM_BUG_ON(!drm_mm_node_allocated(&vma->node));
 245         GEM_BUG_ON(vma->size > vma->node.size);
 246
 247         if (GEM_WARN_ON(range_overflows(vma->node.start,
 248                                         vma->node.size,
 249                                         vma->vm->total)))
 250                 return -ENODEV;
 251
 252         if (GEM_WARN_ON(!flags))
 253                 return -EINVAL;
 254
 255         bind_flags = 0;
 256         if (flags & PIN_GLOBAL)
 257                 bind_flags |= I915_VMA_GLOBAL_BIND;
 258         if (flags & PIN_USER)
 259                 bind_flags |= I915_VMA_LOCAL_BIND;
 260
 261         vma_flags = vma->flags & (I915_VMA_GLOBAL_BIND | I915_VMA_LOCAL_BIND);
 262         if (flags & PIN_UPDATE)
 263                 bind_flags |= vma_flags;
 264         else
 265                 bind_flags &= ~vma_flags;
 266         if (bind_flags == 0)
 267                 return 0;
 268
 269         GEM_BUG_ON(!vma->pages);
 270
 271         trace_i915_vma_bind(vma, bind_flags);
 272         ret = vma->vm->bind_vma(vma, cache_level, bind_flags);
 273         if (ret)
 274                 return ret;
 275
 276         vma->flags |= bind_flags;
 277         return 0;
 278 }
 279
 280 void __iomem *i915_vma_pin_iomap(struct i915_vma *vma)
 281 {
 282         void __iomem *ptr;
 283         int err;
 284
 285         /* Access through the GTT requires the device to be awake. */
 286         assert_rpm_wakelock_held(vma->vm->i915);
 287
 288         lockdep_assert_held(&vma->vm->i915->drm.struct_mutex);
 289         if (WARN_ON(!i915_vma_is_map_and_fenceable(vma))) {
 290                 err = -ENODEV;
 291                 goto err;
 292         }
 293
 294         GEM_BUG_ON(!i915_vma_is_ggtt(vma));
 295         GEM_BUG_ON((vma->flags & I915_VMA_GLOBAL_BIND) == 0);
 296
 297         ptr = vma->iomap;
 298         if (ptr == NULL) {
 299                 ptr = io_mapping_map_wc(&i915_vm_to_ggtt(vma->vm)->mappable,
 300                                         vma->node.start,
 301                                         vma->node.size);
 302                 if (ptr == NULL) {
 303                         err = -ENOMEM;
 304                         goto err;
 305                 }
 306
 307                 vma->iomap = ptr;
 308         }
 309
 310         __i915_vma_pin(vma);
 311
 312         err = i915_vma_get_fence(vma);
 313         if (err)
 314                 goto err_unpin;
 315
 316         i915_vma_pin_fence(vma);
 317
 318         return ptr;
 319
 320 err_unpin:
 321         __i915_vma_unpin(vma);
 322 err:
 323         return IO_ERR_PTR(err);
 324 }
 325
 326 void i915_vma_unpin_iomap(struct i915_vma *vma)
 327 {
 328         lockdep_assert_held(&vma->obj->base.dev->struct_mutex);
 329
 330         GEM_BUG_ON(vma->iomap == NULL);
 331
 332         i915_vma_unpin_fence(vma);
 333         i915_vma_unpin(vma);
 334 }
 335
 336 void i915_vma_unpin_and_release(struct i915_vma **p_vma)
 337 {
 338         struct i915_vma *vma;
 339         struct drm_i915_gem_object *obj;
 340
 341         vma = fetch_and_zero(p_vma);
 342         if (!vma)
 343                 return;
 344
 345         obj = vma->obj;
 346
 347         i915_vma_unpin(vma);
 348         i915_vma_close(vma);
 349
 350         __i915_gem_object_release_unless_active(obj);
 351 }
 352
 353 bool i915_vma_misplaced(const struct i915_vma *vma,
 354                         u64 size, u64 alignment, u64 flags)
 355 {
 356         if (!drm_mm_node_allocated(&vma->node))
 357                 return false;
 358
 359         if (vma->node.size < size)
 360                 return true;
 361
 362         GEM_BUG_ON(alignment && !is_power_of_2(alignment));
 363         if (alignment && !IS_ALIGNED(vma->node.start, alignment))
 364                 return true;
 365
 366         if (flags & PIN_MAPPABLE && !i915_vma_is_map_and_fenceable(vma))
 367                 return true;
 368
 369         if (flags & PIN_OFFSET_BIAS &&
 370             vma->node.start < (flags & PIN_OFFSET_MASK))
 371                 return true;
 372
 373         if (flags & PIN_OFFSET_FIXED &&
 374             vma->node.start != (flags & PIN_OFFSET_MASK))
 375                 return true;
 376
 377         return false;
 378 }
 379
 380 void __i915_vma_set_map_and_fenceable(struct i915_vma *vma)
 381 {
 382         bool mappable, fenceable;
 383
 384         GEM_BUG_ON(!i915_vma_is_ggtt(vma));
 385         GEM_BUG_ON(!vma->fence_size);
 386
 387         /*
 388          * Explicitly disable for rotated VMA since the display does not
 389          * need the fence and the VMA is not accessible to other users.
 390          */
 391         if (vma->ggtt_view.type == I915_GGTT_VIEW_ROTATED)
 392                 return;
 393
 394         fenceable = (vma->node.size >= vma->fence_size &&
 395                      IS_ALIGNED(vma->node.start, vma->fence_alignment));
 396
 397         mappable = vma->node.start + vma->fence_size <= i915_vm_to_ggtt(vma->vm)->mappable_end;
 398
 399         if (mappable && fenceable)
 400                 vma->flags |= I915_VMA_CAN_FENCE;
 401         else
 402                 vma->flags &= ~I915_VMA_CAN_FENCE;
 403 }
 404
 405 static bool color_differs(struct drm_mm_node *node, unsigned long color)
 406 {
 407         return node->allocated && node->color != color;
 408 }
 409
 410 bool i915_gem_valid_gtt_space(struct i915_vma *vma, unsigned long cache_level)
 411 {
 412         struct drm_mm_node *node = &vma->node;
 413         struct drm_mm_node *other;
 414
 415         /*
 416          * On some machines we have to be careful when putting differing types
 417          * of snoopable memory together to avoid the prefetcher crossing memory
 418          * domains and dying. During vm initialisation, we decide whether or not
 419          * these constraints apply and set the drm_mm.color_adjust
 420          * appropriately.
 421          */
 422         if (vma->vm->mm.color_adjust == NULL)
 423                 return true;
 424
 425         /* Only valid to be called on an already inserted vma */
 426         GEM_BUG_ON(!drm_mm_node_allocated(node));
 427         GEM_BUG_ON(list_empty(&node->node_list));
 428
 429         other = list_prev_entry(node, node_list);
 430         if (color_differs(other, cache_level) && !drm_mm_hole_follows(other))
 431                 return false;
 432
 433         other = list_next_entry(node, node_list);
 434         if (color_differs(other, cache_level) && !drm_mm_hole_follows(node))
 435                 return false;
 436
 437         return true;
 438 }
 439
 440 /**
 441  * i915_vma_insert - finds a slot for the vma in its address space
 442  * @vma: the vma
 443  * @size: requested size in bytes (can be larger than the VMA)
 444  * @alignment: required alignment
 445  * @flags: mask of PIN_* flags to use
 446  *
 447  * First we try to allocate some free space that meets the requirements for
 448  * the VMA. Failiing that, if the flags permit, it will evict an old VMA,
 449  * preferrably the oldest idle entry to make room for the new VMA.
 450  *
 451  * Returns:
 452  * 0 on success, negative error code otherwise.
 453  */
 454 static int
 455 i915_vma_insert(struct i915_vma *vma, u64 size, u64 alignment, u64 flags)
 456 {
 457         struct drm_i915_private *dev_priv = vma->vm->i915;
 458         struct drm_i915_gem_object *obj = vma->obj;
 459         u64 start, end;
 460         int ret;
 461
 462         GEM_BUG_ON(vma->flags & (I915_VMA_GLOBAL_BIND | I915_VMA_LOCAL_BIND));
 463         GEM_BUG_ON(drm_mm_node_allocated(&vma->node));
 464
 465         size = max(size, vma->size);
 466         alignment = max(alignment, vma->display_alignment);
 467         if (flags & PIN_MAPPABLE) {
 468                 size = max_t(typeof(size), size, vma->fence_size);
 469                 alignment = max_t(typeof(alignment),
 470                                   alignment, vma->fence_alignment);
 471         }
 472
 473         GEM_BUG_ON(!IS_ALIGNED(size, I915_GTT_PAGE_SIZE));
 474         GEM_BUG_ON(!IS_ALIGNED(alignment, I915_GTT_MIN_ALIGNMENT));
 475         GEM_BUG_ON(!is_power_of_2(alignment));
 476
 477         start = flags & PIN_OFFSET_BIAS ? flags & PIN_OFFSET_MASK : 0;
 478         GEM_BUG_ON(!IS_ALIGNED(start, I915_GTT_PAGE_SIZE));
 479
 480         end = vma->vm->total;
 481         if (flags & PIN_MAPPABLE)
 482                 end = min_t(u64, end, dev_priv->ggtt.mappable_end);
 483         if (flags & PIN_ZONE_4G)
 484                 end = min_t(u64, end, (1ULL << 32) - I915_GTT_PAGE_SIZE);
 485         GEM_BUG_ON(!IS_ALIGNED(end, I915_GTT_PAGE_SIZE));
 486
 487         /* If binding the object/GGTT view requires more space than the entire
 488          * aperture has, reject it early before evicting everything in a vain
 489          * attempt to find space.
 490          */
 491         if (size > end) {
 492                 DRM_DEBUG("Attempting to bind an object larger than the aperture: request=%llu [object=%zd] > %s aperture=%llu\n",
 493                           size, obj->base.size,
 494                           flags & PIN_MAPPABLE ? "mappable" : "total",
 495                           end);
 496                 return -ENOSPC;
 497         }
 498
 499         ret = i915_gem_object_pin_pages(obj);
 500         if (ret)
 501                 return ret;
 502
 503         GEM_BUG_ON(vma->pages);
 504
 505         ret = vma->vm->set_pages(vma);
 506         if (ret)
 507                 goto err_unpin;
 508
 509         if (flags & PIN_OFFSET_FIXED) {
 510                 u64 offset = flags & PIN_OFFSET_MASK;
 511                 if (!IS_ALIGNED(offset, alignment) ||
 512                     range_overflows(offset, size, end)) {
 513                         ret = -EINVAL;
 514                         goto err_clear;
 515                 }
 516
 517                 ret = i915_gem_gtt_reserve(vma->vm, &vma->node,
 518                                            size, offset, obj->cache_level,
 519                                            flags);
 520                 if (ret)
 521                         goto err_clear;
 522         } else {
 523                 /*
 524                  * We only support huge gtt pages through the 48b PPGTT,
 525                  * however we also don't want to force any alignment for
 526                  * objects which need to be tightly packed into the low 32bits.
 527                  *
 528                  * Note that we assume that GGTT are limited to 4GiB for the
 529                  * forseeable future. See also i915_ggtt_offset().
 530                  */
 531                 if (upper_32_bits(end - 1) &&
 532                     vma->page_sizes.sg > I915_GTT_PAGE_SIZE) {
 533                         /*
 534                          * We can't mix 64K and 4K PTEs in the same page-table
 535                          * (2M block), and so to avoid the ugliness and
 536                          * complexity of coloring we opt for just aligning 64K
 537                          * objects to 2M.
 538                          */
 539                         u64 page_alignment =
 540                                 rounddown_pow_of_two(vma->page_sizes.sg |
 541                                                      I915_GTT_PAGE_SIZE_2M);
 542
 543                         /*
 544                          * Check we don't expand for the limited Global GTT
 545                          * (mappable aperture is even more precious!). This
 546                          * also checks that we exclude the aliasing-ppgtt.
 547                          */
 548                         GEM_BUG_ON(i915_vma_is_ggtt(vma));
 549
 550                         alignment = max(alignment, page_alignment);
 551
 552                         if (vma->page_sizes.sg & I915_GTT_PAGE_SIZE_64K)
 553                                 size = round_up(size, I915_GTT_PAGE_SIZE_2M);
 554                 }
 555
 556                 ret = i915_gem_gtt_insert(vma->vm, &vma->node,
 557                                           size, alignment, obj->cache_level,
 558                                           start, end, flags);
 559                 if (ret)
 560                         goto err_clear;
 561
 562                 GEM_BUG_ON(vma->node.start < start);
 563                 GEM_BUG_ON(vma->node.start + vma->node.size > end);
 564         }
 565         GEM_BUG_ON(!drm_mm_node_allocated(&vma->node));
 566         GEM_BUG_ON(!i915_gem_valid_gtt_space(vma, obj->cache_level));
 567
 568         list_move_tail(&obj->global_link, &dev_priv->mm.bound_list);
 569         list_move_tail(&vma->vm_link, &vma->vm->inactive_list);
 570         obj->bind_count++;
 571         GEM_BUG_ON(atomic_read(&obj->mm.pages_pin_count) < obj->bind_count);
 572
 573         return 0;
 574
 575 err_clear:
 576         vma->vm->clear_pages(vma);
 577 err_unpin:
 578         i915_gem_object_unpin_pages(obj);
 579         return ret;
 580 }
 581
 582 static void
 583 i915_vma_remove(struct i915_vma *vma)
 584 {
 585         struct drm_i915_gem_object *obj = vma->obj;
 586
 587         GEM_BUG_ON(!drm_mm_node_allocated(&vma->node));
 588         GEM_BUG_ON(vma->flags & (I915_VMA_GLOBAL_BIND | I915_VMA_LOCAL_BIND));
 589
 590         vma->vm->clear_pages(vma);
 591
 592         drm_mm_remove_node(&vma->node);
 593         list_move_tail(&vma->vm_link, &vma->vm->unbound_list);
 594
 595         /* Since the unbound list is global, only move to that list if
 596          * no more VMAs exist.
 597          */
 598         if (--obj->bind_count == 0)
 599                 list_move_tail(&obj->global_link,
 600                                &to_i915(obj->base.dev)->mm.unbound_list);
 601
 602         /* And finally now the object is completely decoupled from this vma,
 603          * we can drop its hold on the backing storage and allow it to be
 604          * reaped by the shrinker.
 605          */
 606         i915_gem_object_unpin_pages(obj);
 607         GEM_BUG_ON(atomic_read(&obj->mm.pages_pin_count) < obj->bind_count);
 608 }
 609
 610 int __i915_vma_do_pin(struct i915_vma *vma,
 611                       u64 size, u64 alignment, u64 flags)
 612 {
 613         const unsigned int bound = vma->flags;
 614         int ret;
 615
 616         lockdep_assert_held(&vma->vm->i915->drm.struct_mutex);
 617         GEM_BUG_ON((flags & (PIN_GLOBAL | PIN_USER)) == 0);
 618         GEM_BUG_ON((flags & PIN_GLOBAL) && !i915_vma_is_ggtt(vma));
 619
 620         if (WARN_ON(bound & I915_VMA_PIN_OVERFLOW)) {
 621                 ret = -EBUSY;
 622                 goto err_unpin;
 623         }
 624
 625         if ((bound & I915_VMA_BIND_MASK) == 0) {
 626                 ret = i915_vma_insert(vma, size, alignment, flags);
 627                 if (ret)
 628                         goto err_unpin;
 629         }
 630
 631         ret = i915_vma_bind(vma, vma->obj->cache_level, flags);
 632         if (ret)
 633                 goto err_remove;
 634
 635         if ((bound ^ vma->flags) & I915_VMA_GLOBAL_BIND)
 636                 __i915_vma_set_map_and_fenceable(vma);
 637
 638         GEM_BUG_ON(!drm_mm_node_allocated(&vma->node));
 639         GEM_BUG_ON(i915_vma_misplaced(vma, size, alignment, flags));
 640         return 0;
 641
 642 err_remove:
 643         if ((bound & I915_VMA_BIND_MASK) == 0) {
 644                 i915_vma_remove(vma);
 645                 GEM_BUG_ON(vma->pages);
 646         }
 647 err_unpin:
 648         __i915_vma_unpin(vma);
 649         return ret;
 650 }
 651
 652 static void i915_vma_destroy(struct i915_vma *vma)
 653 {
 654         int i;
 655
 656         GEM_BUG_ON(vma->node.allocated);
 657         GEM_BUG_ON(i915_vma_is_active(vma));
 658         GEM_BUG_ON(!i915_vma_is_closed(vma));
 659         GEM_BUG_ON(vma->fence);
 660
 661         for (i = 0; i < ARRAY_SIZE(vma->last_read); i++)
 662                 GEM_BUG_ON(i915_gem_active_isset(&vma->last_read[i]));
 663         GEM_BUG_ON(i915_gem_active_isset(&vma->last_fence));
 664
 665         list_del(&vma->vm_link);
 666         if (!i915_vma_is_ggtt(vma))
 667                 i915_ppgtt_put(i915_vm_to_ppgtt(vma->vm));
 668
 669         kmem_cache_free(to_i915(vma->obj->base.dev)->vmas, vma);
 670 }
 671
 672 void i915_vma_close(struct i915_vma *vma)
 673 {
 674         GEM_BUG_ON(i915_vma_is_closed(vma));
 675         vma->flags |= I915_VMA_CLOSED;
 676
 677         list_del(&vma->obj_link);
 678         rb_erase(&vma->obj_node, &vma->obj->vma_tree);
 679
 680         if (!i915_vma_is_active(vma) && !i915_vma_is_pinned(vma))
 681                 WARN_ON(i915_vma_unbind(vma));
 682 }
 683
 684 static void __i915_vma_iounmap(struct i915_vma *vma)
 685 {
 686         GEM_BUG_ON(i915_vma_is_pinned(vma));
 687
 688         if (vma->iomap == NULL)
 689                 return;
 690
 691         io_mapping_unmap(vma->iomap);
 692         vma->iomap = NULL;
 693 }
 694
 695 int i915_vma_unbind(struct i915_vma *vma)
 696 {
 697         struct drm_i915_gem_object *obj = vma->obj;
 698         unsigned long active;
 699         int ret;
 700
 701         lockdep_assert_held(&obj->base.dev->struct_mutex);
 702
 703         /* First wait upon any activity as retiring the request may
 704          * have side-effects such as unpinning or even unbinding this vma.
 705          */
 706         active = i915_vma_get_active(vma);
 707         if (active) {
 708                 int idx;
 709
 710                 /* When a closed VMA is retired, it is unbound - eek.
 711                  * In order to prevent it from being recursively closed,
 712                  * take a pin on the vma so that the second unbind is
 713                  * aborted.
 714                  *
 715                  * Even more scary is that the retire callback may free
 716                  * the object (last active vma). To prevent the explosion
 717                  * we defer the actual object free to a worker that can
 718                  * only proceed once it acquires the struct_mutex (which
 719                  * we currently hold, therefore it cannot free this object
 720                  * before we are finished).
 721                  */
 722                 __i915_vma_pin(vma);
 723
 724                 for_each_active(active, idx) {
 725                         ret = i915_gem_active_retire(&vma->last_read[idx],
 726                                                      &vma->vm->i915->drm.struct_mutex);
 727                         if (ret)
 728                                 break;
 729                 }
 730
 731                 if (!ret) {
 732                         ret = i915_gem_active_retire(&vma->last_fence,
 733                                                      &vma->vm->i915->drm.struct_mutex);
 734                 }
 735
 736                 __i915_vma_unpin(vma);
 737                 if (ret)
 738                         return ret;
 739         }
 740         GEM_BUG_ON(i915_vma_is_active(vma));
 741
 742         if (i915_vma_is_pinned(vma))
 743                 return -EBUSY;
 744
 745         if (!drm_mm_node_allocated(&vma->node))
 746                 goto destroy;
 747
 748         GEM_BUG_ON(obj->bind_count == 0);
 749         GEM_BUG_ON(!i915_gem_object_has_pinned_pages(obj));
 750
 751         if (i915_vma_is_map_and_fenceable(vma)) {
 752                 /* release the fence reg _after_ flushing */
 753                 ret = i915_vma_put_fence(vma);
 754                 if (ret)
 755                         return ret;
 756
 757                 /* Force a pagefault for domain tracking on next user access */
 758                 i915_gem_release_mmap(obj);
 759
 760                 __i915_vma_iounmap(vma);
 761                 vma->flags &= ~I915_VMA_CAN_FENCE;
 762         }
 763
 764         if (likely(!vma->vm->closed)) {
 765                 trace_i915_vma_unbind(vma);
 766                 vma->vm->unbind_vma(vma);
 767         }
 768         vma->flags &= ~(I915_VMA_GLOBAL_BIND | I915_VMA_LOCAL_BIND);
 769
 770         i915_vma_remove(vma);
 771
 772 destroy:
 773         if (unlikely(i915_vma_is_closed(vma)))
 774                 i915_vma_destroy(vma);
 775
 776         return 0;
 777 }
 778
 779 #if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
 780 #include "selftests/i915_vma.c"
 781 #endif