drivers/gpu/drm/i915/i915_vma.c

   1 /*
   2  * Copyright © 2016 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  * IN THE SOFTWARE.
  22  *
  23  */
  24
  25 #include <linux/sched/mm.h>
  26 #include <drm/drm_gem.h>
  27
  28 #include "display/intel_frontbuffer.h"
  29
  30 #include "gt/intel_engine.h"
  31 #include "gt/intel_engine_heartbeat.h"
  32 #include "gt/intel_gt.h"
  33 #include "gt/intel_gt_requests.h"
  34
  35 #include "i915_drv.h"
  36 #include "i915_globals.h"
  37 #include "i915_sw_fence_work.h"
  38 #include "i915_trace.h"
  39 #include "i915_vma.h"
  40
  41 static struct i915_global_vma {
  42         struct i915_global base;
  43         struct kmem_cache *slab_vmas;
  44 } global;
  45
  46 struct i915_vma *i915_vma_alloc(void)
  47 {
  48         return kmem_cache_zalloc(global.slab_vmas, GFP_KERNEL);
  49 }
  50
  51 void i915_vma_free(struct i915_vma *vma)
  52 {
  53         return kmem_cache_free(global.slab_vmas, vma);
  54 }
  55
  56 #if IS_ENABLED(CONFIG_DRM_I915_ERRLOG_GEM) && IS_ENABLED(CONFIG_DRM_DEBUG_MM)
  57
  58 #include <linux/stackdepot.h>
  59
  60 static void vma_print_allocator(struct i915_vma *vma, const char *reason)
  61 {
  62         unsigned long *entries;
  63         unsigned int nr_entries;
  64         char buf[512];
  65
  66         if (!vma->node.stack) {
  67                 DRM_DEBUG_DRIVER("vma.node [%08llx + %08llx] %s: unknown owner\n",
  68                                  vma->node.start, vma->node.size, reason);
  69                 return;
  70         }
  71
  72         nr_entries = stack_depot_fetch(vma->node.stack, &entries);
  73         stack_trace_snprint(buf, sizeof(buf), entries, nr_entries, 0);
  74         DRM_DEBUG_DRIVER("vma.node [%08llx + %08llx] %s: inserted at %s\n",
  75                          vma->node.start, vma->node.size, reason, buf);
  76 }
  77
  78 #else
  79
  80 static void vma_print_allocator(struct i915_vma *vma, const char *reason)
  81 {
  82 }
  83
  84 #endif
  85
  86 static inline struct i915_vma *active_to_vma(struct i915_active *ref)
  87 {
  88         return container_of(ref, typeof(struct i915_vma), active);
  89 }
  90
  91 static int __i915_vma_active(struct i915_active *ref)
  92 {
  93         return i915_vma_tryget(active_to_vma(ref)) ? 0 : -ENOENT;
  94 }
  95
  96 __i915_active_call
  97 static void __i915_vma_retire(struct i915_active *ref)
  98 {
  99         i915_vma_put(active_to_vma(ref));
 100 }
 101
 102 static struct i915_vma *
 103 vma_create(struct drm_i915_gem_object *obj,
 104            struct i915_address_space *vm,
 105            const struct i915_ggtt_view *view)
 106 {
 107         struct i915_vma *pos = ERR_PTR(-E2BIG);
 108         struct i915_vma *vma;
 109         struct rb_node *rb, **p;
 110
 111         /* The aliasing_ppgtt should never be used directly! */
 112         GEM_BUG_ON(vm == &vm->gt->ggtt->alias->vm);
 113
 114         vma = i915_vma_alloc();
 115         if (vma == NULL)
 116                 return ERR_PTR(-ENOMEM);
 117
 118         kref_init(&vma->ref);
 119         mutex_init(&vma->pages_mutex);
 120         vma->vm = i915_vm_get(vm);
 121         vma->ops = &vm->vma_ops;
 122         vma->obj = obj;
 123         vma->resv = obj->base.resv;
 124         vma->size = obj->base.size;
 125         vma->display_alignment = I915_GTT_MIN_ALIGNMENT;
 126
 127         i915_active_init(&vma->active, __i915_vma_active, __i915_vma_retire);
 128
 129         /* Declare ourselves safe for use inside shrinkers */
 130         if (IS_ENABLED(CONFIG_LOCKDEP)) {
 131                 fs_reclaim_acquire(GFP_KERNEL);
 132                 might_lock(&vma->active.mutex);
 133                 fs_reclaim_release(GFP_KERNEL);
 134         }
 135
 136         INIT_LIST_HEAD(&vma->closed_link);
 137
 138         if (view && view->type != I915_GGTT_VIEW_NORMAL) {
 139                 vma->ggtt_view = *view;
 140                 if (view->type == I915_GGTT_VIEW_PARTIAL) {
 141                         GEM_BUG_ON(range_overflows_t(u64,
 142                                                      view->partial.offset,
 143                                                      view->partial.size,
 144                                                      obj->base.size >> PAGE_SHIFT));
 145                         vma->size = view->partial.size;
 146                         vma->size <<= PAGE_SHIFT;
 147                         GEM_BUG_ON(vma->size > obj->base.size);
 148                 } else if (view->type == I915_GGTT_VIEW_ROTATED) {
 149                         vma->size = intel_rotation_info_size(&view->rotated);
 150                         vma->size <<= PAGE_SHIFT;
 151                 } else if (view->type == I915_GGTT_VIEW_REMAPPED) {
 152                         vma->size = intel_remapped_info_size(&view->remapped);
 153                         vma->size <<= PAGE_SHIFT;
 154                 }
 155         }
 156
 157         if (unlikely(vma->size > vm->total))
 158                 goto err_vma;
 159
 160         GEM_BUG_ON(!IS_ALIGNED(vma->size, I915_GTT_PAGE_SIZE));
 161
 162         spin_lock(&obj->vma.lock);
 163
 164         if (i915_is_ggtt(vm)) {
 165                 if (unlikely(overflows_type(vma->size, u32)))
 166                         goto err_unlock;
 167
 168                 vma->fence_size = i915_gem_fence_size(vm->i915, vma->size,
 169                                                       i915_gem_object_get_tiling(obj),
 170                                                       i915_gem_object_get_stride(obj));
 171                 if (unlikely(vma->fence_size < vma->size || /* overflow */
 172                              vma->fence_size > vm->total))
 173                         goto err_unlock;
 174
 175                 GEM_BUG_ON(!IS_ALIGNED(vma->fence_size, I915_GTT_MIN_ALIGNMENT));
 176
 177                 vma->fence_alignment = i915_gem_fence_alignment(vm->i915, vma->size,
 178                                                                 i915_gem_object_get_tiling(obj),
 179                                                                 i915_gem_object_get_stride(obj));
 180                 GEM_BUG_ON(!is_power_of_2(vma->fence_alignment));
 181
 182                 __set_bit(I915_VMA_GGTT_BIT, __i915_vma_flags(vma));
 183         }
 184
 185         rb = NULL;
 186         p = &obj->vma.tree.rb_node;
 187         while (*p) {
 188                 long cmp;
 189
 190                 rb = *p;
 191                 pos = rb_entry(rb, struct i915_vma, obj_node);
 192
 193                 /*
 194                  * If the view already exists in the tree, another thread
 195                  * already created a matching vma, so return the older instance
 196                  * and dispose of ours.
 197                  */
 198                 cmp = i915_vma_compare(pos, vm, view);
 199                 if (cmp < 0)
 200                         p = &rb->rb_right;
 201                 else if (cmp > 0)
 202                         p = &rb->rb_left;
 203                 else
 204                         goto err_unlock;
 205         }
 206         rb_link_node(&vma->obj_node, rb, p);
 207         rb_insert_color(&vma->obj_node, &obj->vma.tree);
 208
 209         if (i915_vma_is_ggtt(vma))
 210                 /*
 211                  * We put the GGTT vma at the start of the vma-list, followed
 212                  * by the ppGGTT vma. This allows us to break early when
 213                  * iterating over only the GGTT vma for an object, see
 214                  * for_each_ggtt_vma()
 215                  */
 216                 list_add(&vma->obj_link, &obj->vma.list);
 217         else
 218                 list_add_tail(&vma->obj_link, &obj->vma.list);
 219
 220         spin_unlock(&obj->vma.lock);
 221
 222         return vma;
 223
 224 err_unlock:
 225         spin_unlock(&obj->vma.lock);
 226 err_vma:
 227         i915_vm_put(vm);
 228         i915_vma_free(vma);
 229         return pos;
 230 }
 231
 232 static struct i915_vma *
 233 vma_lookup(struct drm_i915_gem_object *obj,
 234            struct i915_address_space *vm,
 235            const struct i915_ggtt_view *view)
 236 {
 237         struct rb_node *rb;
 238
 239         rb = obj->vma.tree.rb_node;
 240         while (rb) {
 241                 struct i915_vma *vma = rb_entry(rb, struct i915_vma, obj_node);
 242                 long cmp;
 243
 244                 cmp = i915_vma_compare(vma, vm, view);
 245                 if (cmp == 0)
 246                         return vma;
 247
 248                 if (cmp < 0)
 249                         rb = rb->rb_right;
 250                 else
 251                         rb = rb->rb_left;
 252         }
 253
 254         return NULL;
 255 }
 256
 257 /**
 258  * i915_vma_instance - return the singleton instance of the VMA
 259  * @obj: parent &struct drm_i915_gem_object to be mapped
 260  * @vm: address space in which the mapping is located
 261  * @view: additional mapping requirements
 262  *
 263  * i915_vma_instance() looks up an existing VMA of the @obj in the @vm with
 264  * the same @view characteristics. If a match is not found, one is created.
 265  * Once created, the VMA is kept until either the object is freed, or the
 266  * address space is closed.
 267  *
 268  * Returns the vma, or an error pointer.
 269  */
 270 struct i915_vma *
 271 i915_vma_instance(struct drm_i915_gem_object *obj,
 272                   struct i915_address_space *vm,
 273                   const struct i915_ggtt_view *view)
 274 {
 275         struct i915_vma *vma;
 276
 277         GEM_BUG_ON(view && !i915_is_ggtt(vm));
 278         GEM_BUG_ON(!atomic_read(&vm->open));
 279
 280         spin_lock(&obj->vma.lock);
 281         vma = vma_lookup(obj, vm, view);
 282         spin_unlock(&obj->vma.lock);
 283
 284         /* vma_create() will resolve the race if another creates the vma */
 285         if (unlikely(!vma))
 286                 vma = vma_create(obj, vm, view);
 287
 288         GEM_BUG_ON(!IS_ERR(vma) && i915_vma_compare(vma, vm, view));
 289         return vma;
 290 }
 291
 292 struct i915_vma_work {
 293         struct dma_fence_work base;
 294         struct i915_address_space *vm;
 295         struct i915_vm_pt_stash stash;
 296         struct i915_vma *vma;
 297         struct drm_i915_gem_object *pinned;
 298         struct i915_sw_dma_fence_cb cb;
 299         enum i915_cache_level cache_level;
 300         unsigned int flags;
 301 };
 302
 303 static int __vma_bind(struct dma_fence_work *work)
 304 {
 305         struct i915_vma_work *vw = container_of(work, typeof(*vw), base);
 306         struct i915_vma *vma = vw->vma;
 307
 308         vma->ops->bind_vma(vw->vm, &vw->stash,
 309                            vma, vw->cache_level, vw->flags);
 310         return 0;
 311 }
 312
 313 static void __vma_release(struct dma_fence_work *work)
 314 {
 315         struct i915_vma_work *vw = container_of(work, typeof(*vw), base);
 316
 317         if (vw->pinned) {
 318                 __i915_gem_object_unpin_pages(vw->pinned);
 319                 i915_gem_object_put(vw->pinned);
 320         }
 321
 322         i915_vm_free_pt_stash(vw->vm, &vw->stash);
 323         i915_vm_put(vw->vm);
 324 }
 325
 326 static const struct dma_fence_work_ops bind_ops = {
 327         .name = "bind",
 328         .work = __vma_bind,
 329         .release = __vma_release,
 330 };
 331
 332 struct i915_vma_work *i915_vma_work(void)
 333 {
 334         struct i915_vma_work *vw;
 335
 336         vw = kzalloc(sizeof(*vw), GFP_KERNEL);
 337         if (!vw)
 338                 return NULL;
 339
 340         dma_fence_work_init(&vw->base, &bind_ops);
 341         vw->base.dma.error = -EAGAIN; /* disable the worker by default */
 342
 343         return vw;
 344 }
 345
 346 int i915_vma_wait_for_bind(struct i915_vma *vma)
 347 {
 348         int err = 0;
 349
 350         if (rcu_access_pointer(vma->active.excl.fence)) {
 351                 struct dma_fence *fence;
 352
 353                 rcu_read_lock();
 354                 fence = dma_fence_get_rcu_safe(&vma->active.excl.fence);
 355                 rcu_read_unlock();
 356                 if (fence) {
 357                         err = dma_fence_wait(fence, MAX_SCHEDULE_TIMEOUT);
 358                         dma_fence_put(fence);
 359                 }
 360         }
 361
 362         return err;
 363 }
 364
 365 /**
 366  * i915_vma_bind - Sets up PTEs for an VMA in it's corresponding address space.
 367  * @vma: VMA to map
 368  * @cache_level: mapping cache level
 369  * @flags: flags like global or local mapping
 370  * @work: preallocated worker for allocating and binding the PTE
 371  *
 372  * DMA addresses are taken from the scatter-gather table of this object (or of
 373  * this VMA in case of non-default GGTT views) and PTE entries set up.
 374  * Note that DMA addresses are also the only part of the SG table we care about.
 375  */
 376 int i915_vma_bind(struct i915_vma *vma,
 377                   enum i915_cache_level cache_level,
 378                   u32 flags,
 379                   struct i915_vma_work *work)
 380 {
 381         u32 bind_flags;
 382         u32 vma_flags;
 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
 401         bind_flags &= ~vma_flags;
 402         if (bind_flags == 0)
 403                 return 0;
 404
 405         GEM_BUG_ON(!vma->pages);
 406
 407         trace_i915_vma_bind(vma, bind_flags);
 408         if (work && bind_flags & vma->vm->bind_async_flags) {
 409                 struct dma_fence *prev;
 410
 411                 work->vma = vma;
 412                 work->cache_level = cache_level;
 413                 work->flags = bind_flags;
 414
 415                 /*
 416                  * Note we only want to chain up to the migration fence on
 417                  * the pages (not the object itself). As we don't track that,
 418                  * yet, we have to use the exclusive fence instead.
 419                  *
 420                  * Also note that we do not want to track the async vma as
 421                  * part of the obj->resv->excl_fence as it only affects
 422                  * execution and not content or object's backing store lifetime.
 423                  */
 424                 prev = i915_active_set_exclusive(&vma->active, &work->base.dma);
 425                 if (prev) {
 426                         __i915_sw_fence_await_dma_fence(&work->base.chain,
 427                                                         prev,
 428                                                         &work->cb);
 429                         dma_fence_put(prev);
 430                 }
 431
 432                 work->base.dma.error = 0; /* enable the queue_work() */
 433
 434                 if (vma->obj) {
 435                         __i915_gem_object_pin_pages(vma->obj);
 436                         work->pinned = i915_gem_object_get(vma->obj);
 437                 }
 438         } else {
 439                 vma->ops->bind_vma(vma->vm, NULL, vma, cache_level, bind_flags);
 440         }
 441
 442         if (vma->obj)
 443                 set_bit(I915_BO_WAS_BOUND_BIT, &vma->obj->flags);
 444
 445         atomic_or(bind_flags, &vma->flags);
 446         return 0;
 447 }
 448
 449 void __iomem *i915_vma_pin_iomap(struct i915_vma *vma)
 450 {
 451         void __iomem *ptr;
 452         int err;
 453
 454         if (GEM_WARN_ON(!i915_vma_is_map_and_fenceable(vma))) {
 455                 err = -ENODEV;
 456                 goto err;
 457         }
 458
 459         GEM_BUG_ON(!i915_vma_is_ggtt(vma));
 460         GEM_BUG_ON(!i915_vma_is_bound(vma, I915_VMA_GLOBAL_BIND));
 461
 462         ptr = READ_ONCE(vma->iomap);
 463         if (ptr == NULL) {
 464                 ptr = io_mapping_map_wc(&i915_vm_to_ggtt(vma->vm)->iomap,
 465                                         vma->node.start,
 466                                         vma->node.size);
 467                 if (ptr == NULL) {
 468                         err = -ENOMEM;
 469                         goto err;
 470                 }
 471
 472                 if (unlikely(cmpxchg(&vma->iomap, NULL, ptr))) {
 473                         io_mapping_unmap(ptr);
 474                         ptr = vma->iomap;
 475                 }
 476         }
 477
 478         __i915_vma_pin(vma);
 479
 480         err = i915_vma_pin_fence(vma);
 481         if (err)
 482                 goto err_unpin;
 483
 484         i915_vma_set_ggtt_write(vma);
 485
 486         /* NB Access through the GTT requires the device to be awake. */
 487         return ptr;
 488
 489 err_unpin:
 490         __i915_vma_unpin(vma);
 491 err:
 492         return IO_ERR_PTR(err);
 493 }
 494
 495 void i915_vma_flush_writes(struct i915_vma *vma)
 496 {
 497         if (i915_vma_unset_ggtt_write(vma))
 498                 intel_gt_flush_ggtt_writes(vma->vm->gt);
 499 }
 500
 501 void i915_vma_unpin_iomap(struct i915_vma *vma)
 502 {
 503         GEM_BUG_ON(vma->iomap == NULL);
 504
 505         i915_vma_flush_writes(vma);
 506
 507         i915_vma_unpin_fence(vma);
 508         i915_vma_unpin(vma);
 509 }
 510
 511 void i915_vma_unpin_and_release(struct i915_vma **p_vma, unsigned int flags)
 512 {
 513         struct i915_vma *vma;
 514         struct drm_i915_gem_object *obj;
 515
 516         vma = fetch_and_zero(p_vma);
 517         if (!vma)
 518                 return;
 519
 520         obj = vma->obj;
 521         GEM_BUG_ON(!obj);
 522
 523         i915_vma_unpin(vma);
 524
 525         if (flags & I915_VMA_RELEASE_MAP)
 526                 i915_gem_object_unpin_map(obj);
 527
 528         i915_gem_object_put(obj);
 529 }
 530
 531 bool i915_vma_misplaced(const struct i915_vma *vma,
 532                         u64 size, u64 alignment, u64 flags)
 533 {
 534         if (!drm_mm_node_allocated(&vma->node))
 535                 return false;
 536
 537         if (test_bit(I915_VMA_ERROR_BIT, __i915_vma_flags(vma)))
 538                 return true;
 539
 540         if (vma->node.size < size)
 541                 return true;
 542
 543         GEM_BUG_ON(alignment && !is_power_of_2(alignment));
 544         if (alignment && !IS_ALIGNED(vma->node.start, alignment))
 545                 return true;
 546
 547         if (flags & PIN_MAPPABLE && !i915_vma_is_map_and_fenceable(vma))
 548                 return true;
 549
 550         if (flags & PIN_OFFSET_BIAS &&
 551             vma->node.start < (flags & PIN_OFFSET_MASK))
 552                 return true;
 553
 554         if (flags & PIN_OFFSET_FIXED &&
 555             vma->node.start != (flags & PIN_OFFSET_MASK))
 556                 return true;
 557
 558         return false;
 559 }
 560
 561 void __i915_vma_set_map_and_fenceable(struct i915_vma *vma)
 562 {
 563         bool mappable, fenceable;
 564
 565         GEM_BUG_ON(!i915_vma_is_ggtt(vma));
 566         GEM_BUG_ON(!vma->fence_size);
 567
 568         fenceable = (vma->node.size >= vma->fence_size &&
 569                      IS_ALIGNED(vma->node.start, vma->fence_alignment));
 570
 571         mappable = vma->node.start + vma->fence_size <= i915_vm_to_ggtt(vma->vm)->mappable_end;
 572
 573         if (mappable && fenceable)
 574                 set_bit(I915_VMA_CAN_FENCE_BIT, __i915_vma_flags(vma));
 575         else
 576                 clear_bit(I915_VMA_CAN_FENCE_BIT, __i915_vma_flags(vma));
 577 }
 578
 579 bool i915_gem_valid_gtt_space(struct i915_vma *vma, unsigned long color)
 580 {
 581         struct drm_mm_node *node = &vma->node;
 582         struct drm_mm_node *other;
 583
 584         /*
 585          * On some machines we have to be careful when putting differing types
 586          * of snoopable memory together to avoid the prefetcher crossing memory
 587          * domains and dying. During vm initialisation, we decide whether or not
 588          * these constraints apply and set the drm_mm.color_adjust
 589          * appropriately.
 590          */
 591         if (!i915_vm_has_cache_coloring(vma->vm))
 592                 return true;
 593
 594         /* Only valid to be called on an already inserted vma */
 595         GEM_BUG_ON(!drm_mm_node_allocated(node));
 596         GEM_BUG_ON(list_empty(&node->node_list));
 597
 598         other = list_prev_entry(node, node_list);
 599         if (i915_node_color_differs(other, color) &&
 600             !drm_mm_hole_follows(other))
 601                 return false;
 602
 603         other = list_next_entry(node, node_list);
 604         if (i915_node_color_differs(other, color) &&
 605             !drm_mm_hole_follows(node))
 606                 return false;
 607
 608         return true;
 609 }
 610
 611 /**
 612  * i915_vma_insert - finds a slot for the vma in its address space
 613  * @vma: the vma
 614  * @size: requested size in bytes (can be larger than the VMA)
 615  * @alignment: required alignment
 616  * @flags: mask of PIN_* flags to use
 617  *
 618  * First we try to allocate some free space that meets the requirements for
 619  * the VMA. Failiing that, if the flags permit, it will evict an old VMA,
 620  * preferrably the oldest idle entry to make room for the new VMA.
 621  *
 622  * Returns:
 623  * 0 on success, negative error code otherwise.
 624  */
 625 static int
 626 i915_vma_insert(struct i915_vma *vma, u64 size, u64 alignment, u64 flags)
 627 {
 628         unsigned long color;
 629         u64 start, end;
 630         int ret;
 631
 632         GEM_BUG_ON(i915_vma_is_bound(vma, I915_VMA_GLOBAL_BIND | I915_VMA_LOCAL_BIND));
 633         GEM_BUG_ON(drm_mm_node_allocated(&vma->node));
 634
 635         size = max(size, vma->size);
 636         alignment = max(alignment, vma->display_alignment);
 637         if (flags & PIN_MAPPABLE) {
 638                 size = max_t(typeof(size), size, vma->fence_size);
 639                 alignment = max_t(typeof(alignment),
 640                                   alignment, vma->fence_alignment);
 641         }
 642
 643         GEM_BUG_ON(!IS_ALIGNED(size, I915_GTT_PAGE_SIZE));
 644         GEM_BUG_ON(!IS_ALIGNED(alignment, I915_GTT_MIN_ALIGNMENT));
 645         GEM_BUG_ON(!is_power_of_2(alignment));
 646
 647         start = flags & PIN_OFFSET_BIAS ? flags & PIN_OFFSET_MASK : 0;
 648         GEM_BUG_ON(!IS_ALIGNED(start, I915_GTT_PAGE_SIZE));
 649
 650         end = vma->vm->total;
 651         if (flags & PIN_MAPPABLE)
 652                 end = min_t(u64, end, i915_vm_to_ggtt(vma->vm)->mappable_end);
 653         if (flags & PIN_ZONE_4G)
 654                 end = min_t(u64, end, (1ULL << 32) - I915_GTT_PAGE_SIZE);
 655         GEM_BUG_ON(!IS_ALIGNED(end, I915_GTT_PAGE_SIZE));
 656
 657         /* If binding the object/GGTT view requires more space than the entire
 658          * aperture has, reject it early before evicting everything in a vain
 659          * attempt to find space.
 660          */
 661         if (size > end) {
 662                 DRM_DEBUG("Attempting to bind an object larger than the aperture: request=%llu > %s aperture=%llu\n",
 663                           size, flags & PIN_MAPPABLE ? "mappable" : "total",
 664                           end);
 665                 return -ENOSPC;
 666         }
 667
 668         color = 0;
 669         if (vma->obj && i915_vm_has_cache_coloring(vma->vm))
 670                 color = vma->obj->cache_level;
 671
 672         if (flags & PIN_OFFSET_FIXED) {
 673                 u64 offset = flags & PIN_OFFSET_MASK;
 674                 if (!IS_ALIGNED(offset, alignment) ||
 675                     range_overflows(offset, size, end))
 676                         return -EINVAL;
 677
 678                 ret = i915_gem_gtt_reserve(vma->vm, &vma->node,
 679                                            size, offset, color,
 680                                            flags);
 681                 if (ret)
 682                         return ret;
 683         } else {
 684                 /*
 685                  * We only support huge gtt pages through the 48b PPGTT,
 686                  * however we also don't want to force any alignment for
 687                  * objects which need to be tightly packed into the low 32bits.
 688                  *
 689                  * Note that we assume that GGTT are limited to 4GiB for the
 690                  * forseeable future. See also i915_ggtt_offset().
 691                  */
 692                 if (upper_32_bits(end - 1) &&
 693                     vma->page_sizes.sg > I915_GTT_PAGE_SIZE) {
 694                         /*
 695                          * We can't mix 64K and 4K PTEs in the same page-table
 696                          * (2M block), and so to avoid the ugliness and
 697                          * complexity of coloring we opt for just aligning 64K
 698                          * objects to 2M.
 699                          */
 700                         u64 page_alignment =
 701                                 rounddown_pow_of_two(vma->page_sizes.sg |
 702                                                      I915_GTT_PAGE_SIZE_2M);
 703
 704                         /*
 705                          * Check we don't expand for the limited Global GTT
 706                          * (mappable aperture is even more precious!). This
 707                          * also checks that we exclude the aliasing-ppgtt.
 708                          */
 709                         GEM_BUG_ON(i915_vma_is_ggtt(vma));
 710
 711                         alignment = max(alignment, page_alignment);
 712
 713                         if (vma->page_sizes.sg & I915_GTT_PAGE_SIZE_64K)
 714                                 size = round_up(size, I915_GTT_PAGE_SIZE_2M);
 715                 }
 716
 717                 ret = i915_gem_gtt_insert(vma->vm, &vma->node,
 718                                           size, alignment, color,
 719                                           start, end, flags);
 720                 if (ret)
 721                         return ret;
 722
 723                 GEM_BUG_ON(vma->node.start < start);
 724                 GEM_BUG_ON(vma->node.start + vma->node.size > end);
 725         }
 726         GEM_BUG_ON(!drm_mm_node_allocated(&vma->node));
 727         GEM_BUG_ON(!i915_gem_valid_gtt_space(vma, color));
 728
 729         list_add_tail(&vma->vm_link, &vma->vm->bound_list);
 730
 731         return 0;
 732 }
 733
 734 static void
 735 i915_vma_detach(struct i915_vma *vma)
 736 {
 737         GEM_BUG_ON(!drm_mm_node_allocated(&vma->node));
 738         GEM_BUG_ON(i915_vma_is_bound(vma, I915_VMA_GLOBAL_BIND | I915_VMA_LOCAL_BIND));
 739
 740         /*
 741          * And finally now the object is completely decoupled from this
 742          * vma, we can drop its hold on the backing storage and allow
 743          * it to be reaped by the shrinker.
 744          */
 745         list_del(&vma->vm_link);
 746 }
 747
 748 static bool try_qad_pin(struct i915_vma *vma, unsigned int flags)
 749 {
 750         unsigned int bound;
 751         bool pinned = true;
 752
 753         bound = atomic_read(&vma->flags);
 754         do {
 755                 if (unlikely(flags & ~bound))
 756                         return false;
 757
 758                 if (unlikely(bound & (I915_VMA_OVERFLOW | I915_VMA_ERROR)))
 759                         return false;
 760
 761                 if (!(bound & I915_VMA_PIN_MASK))
 762                         goto unpinned;
 763
 764                 GEM_BUG_ON(((bound + 1) & I915_VMA_PIN_MASK) == 0);
 765         } while (!atomic_try_cmpxchg(&vma->flags, &bound, bound + 1));
 766
 767         return true;
 768
 769 unpinned:
 770         /*
 771          * If pin_count==0, but we are bound, check under the lock to avoid
 772          * racing with a concurrent i915_vma_unbind().
 773          */
 774         mutex_lock(&vma->vm->mutex);
 775         do {
 776                 if (unlikely(bound & (I915_VMA_OVERFLOW | I915_VMA_ERROR))) {
 777                         pinned = false;
 778                         break;
 779                 }
 780
 781                 if (unlikely(flags & ~bound)) {
 782                         pinned = false;
 783                         break;
 784                 }
 785         } while (!atomic_try_cmpxchg(&vma->flags, &bound, bound + 1));
 786         mutex_unlock(&vma->vm->mutex);
 787
 788         return pinned;
 789 }
 790
 791 static int vma_get_pages(struct i915_vma *vma)
 792 {
 793         int err = 0;
 794
 795         if (atomic_add_unless(&vma->pages_count, 1, 0))
 796                 return 0;
 797
 798         /* Allocations ahoy! */
 799         if (mutex_lock_interruptible(&vma->pages_mutex))
 800                 return -EINTR;
 801
 802         if (!atomic_read(&vma->pages_count)) {
 803                 if (vma->obj) {
 804                         err = i915_gem_object_pin_pages(vma->obj);
 805                         if (err)
 806                                 goto unlock;
 807                 }
 808
 809                 err = vma->ops->set_pages(vma);
 810                 if (err) {
 811                         if (vma->obj)
 812                                 i915_gem_object_unpin_pages(vma->obj);
 813                         goto unlock;
 814                 }
 815         }
 816         atomic_inc(&vma->pages_count);
 817
 818 unlock:
 819         mutex_unlock(&vma->pages_mutex);
 820
 821         return err;
 822 }
 823
 824 static void __vma_put_pages(struct i915_vma *vma, unsigned int count)
 825 {
 826         /* We allocate under vma_get_pages, so beware the shrinker */
 827         mutex_lock_nested(&vma->pages_mutex, SINGLE_DEPTH_NESTING);
 828         GEM_BUG_ON(atomic_read(&vma->pages_count) < count);
 829         if (atomic_sub_return(count, &vma->pages_count) == 0) {
 830                 vma->ops->clear_pages(vma);
 831                 GEM_BUG_ON(vma->pages);
 832                 if (vma->obj)
 833                         i915_gem_object_unpin_pages(vma->obj);
 834         }
 835         mutex_unlock(&vma->pages_mutex);
 836 }
 837
 838 static void vma_put_pages(struct i915_vma *vma)
 839 {
 840         if (atomic_add_unless(&vma->pages_count, -1, 1))
 841                 return;
 842
 843         __vma_put_pages(vma, 1);
 844 }
 845
 846 static void vma_unbind_pages(struct i915_vma *vma)
 847 {
 848         unsigned int count;
 849
 850         lockdep_assert_held(&vma->vm->mutex);
 851
 852         /* The upper portion of pages_count is the number of bindings */
 853         count = atomic_read(&vma->pages_count);
 854         count >>= I915_VMA_PAGES_BIAS;
 855         GEM_BUG_ON(!count);
 856
 857         __vma_put_pages(vma, count | count << I915_VMA_PAGES_BIAS);
 858 }
 859
 860 int i915_vma_pin_ww(struct i915_vma *vma, struct i915_gem_ww_ctx *ww,
 861                     u64 size, u64 alignment, u64 flags)
 862 {
 863         struct i915_vma_work *work = NULL;
 864         intel_wakeref_t wakeref = 0;
 865         unsigned int bound;
 866         int err;
 867
 868 #ifdef CONFIG_PROVE_LOCKING
 869         if (debug_locks && lockdep_is_held(&vma->vm->i915->drm.struct_mutex))
 870                 WARN_ON(!ww);
 871 #endif
 872
 873         BUILD_BUG_ON(PIN_GLOBAL != I915_VMA_GLOBAL_BIND);
 874         BUILD_BUG_ON(PIN_USER != I915_VMA_LOCAL_BIND);
 875
 876         GEM_BUG_ON(!(flags & (PIN_USER | PIN_GLOBAL)));
 877
 878         /* First try and grab the pin without rebinding the vma */
 879         if (try_qad_pin(vma, flags & I915_VMA_BIND_MASK))
 880                 return 0;
 881
 882         err = vma_get_pages(vma);
 883         if (err)
 884                 return err;
 885
 886         if (flags & PIN_GLOBAL)
 887                 wakeref = intel_runtime_pm_get(&vma->vm->i915->runtime_pm);
 888
 889         if (flags & vma->vm->bind_async_flags) {
 890                 work = i915_vma_work();
 891                 if (!work) {
 892                         err = -ENOMEM;
 893                         goto err_rpm;
 894                 }
 895
 896                 work->vm = i915_vm_get(vma->vm);
 897
 898                 /* Allocate enough page directories to used PTE */
 899                 if (vma->vm->allocate_va_range) {
 900                         err = i915_vm_alloc_pt_stash(vma->vm,
 901                                                      &work->stash,
 902                                                      vma->size);
 903                         if (err)
 904                                 goto err_fence;
 905
 906                         err = i915_vm_pin_pt_stash(vma->vm,
 907                                                    &work->stash);
 908                         if (err)
 909                                 goto err_fence;
 910                 }
 911         }
 912
 913         /*
 914          * Differentiate between user/kernel vma inside the aliasing-ppgtt.
 915          *
 916          * We conflate the Global GTT with the user's vma when using the
 917          * aliasing-ppgtt, but it is still vitally important to try and
 918          * keep the use cases distinct. For example, userptr objects are
 919          * not allowed inside the Global GTT as that will cause lock
 920          * inversions when we have to evict them the mmu_notifier callbacks -
 921          * but they are allowed to be part of the user ppGTT which can never
 922          * be mapped. As such we try to give the distinct users of the same
 923          * mutex, distinct lockclasses [equivalent to how we keep i915_ggtt
 924          * and i915_ppgtt separate].
 925          *
 926          * NB this may cause us to mask real lock inversions -- while the
 927          * code is safe today, lockdep may not be able to spot future
 928          * transgressions.
 929          */
 930         err = mutex_lock_interruptible_nested(&vma->vm->mutex,
 931                                               !(flags & PIN_GLOBAL));
 932         if (err)
 933                 goto err_fence;
 934
 935         /* No more allocations allowed now we hold vm->mutex */
 936
 937         if (unlikely(i915_vma_is_closed(vma))) {
 938                 err = -ENOENT;
 939                 goto err_unlock;
 940         }
 941
 942         bound = atomic_read(&vma->flags);
 943         if (unlikely(bound & I915_VMA_ERROR)) {
 944                 err = -ENOMEM;
 945                 goto err_unlock;
 946         }
 947
 948         if (unlikely(!((bound + 1) & I915_VMA_PIN_MASK))) {
 949                 err = -EAGAIN; /* pins are meant to be fairly temporary */
 950                 goto err_unlock;
 951         }
 952
 953         if (unlikely(!(flags & ~bound & I915_VMA_BIND_MASK))) {
 954                 __i915_vma_pin(vma);
 955                 goto err_unlock;
 956         }
 957
 958         err = i915_active_acquire(&vma->active);
 959         if (err)
 960                 goto err_unlock;
 961
 962         if (!(bound & I915_VMA_BIND_MASK)) {
 963                 err = i915_vma_insert(vma, size, alignment, flags);
 964                 if (err)
 965                         goto err_active;
 966
 967                 if (i915_is_ggtt(vma->vm))
 968                         __i915_vma_set_map_and_fenceable(vma);
 969         }
 970
 971         GEM_BUG_ON(!vma->pages);
 972         err = i915_vma_bind(vma,
 973                             vma->obj ? vma->obj->cache_level : 0,
 974                             flags, work);
 975         if (err)
 976                 goto err_remove;
 977
 978         /* There should only be at most 2 active bindings (user, global) */
 979         GEM_BUG_ON(bound + I915_VMA_PAGES_ACTIVE < bound);
 980         atomic_add(I915_VMA_PAGES_ACTIVE, &vma->pages_count);
 981         list_move_tail(&vma->vm_link, &vma->vm->bound_list);
 982
 983         __i915_vma_pin(vma);
 984         GEM_BUG_ON(!i915_vma_is_pinned(vma));
 985         GEM_BUG_ON(!i915_vma_is_bound(vma, flags));
 986         GEM_BUG_ON(i915_vma_misplaced(vma, size, alignment, flags));
 987
 988 err_remove:
 989         if (!i915_vma_is_bound(vma, I915_VMA_BIND_MASK)) {
 990                 i915_vma_detach(vma);
 991                 drm_mm_remove_node(&vma->node);
 992         }
 993 err_active:
 994         i915_active_release(&vma->active);
 995 err_unlock:
 996         mutex_unlock(&vma->vm->mutex);
 997 err_fence:
 998         if (work)
 999                 dma_fence_work_commit_imm(&work->base);
1000 err_rpm:
1001         if (wakeref)
1002                 intel_runtime_pm_put(&vma->vm->i915->runtime_pm, wakeref);
1003         vma_put_pages(vma);
1004         return err;
1005 }
1006
1007 static void flush_idle_contexts(struct intel_gt *gt)
1008 {
1009         struct intel_engine_cs *engine;
1010         enum intel_engine_id id;
1011
1012         for_each_engine(engine, gt, id)
1013                 intel_engine_flush_barriers(engine);
1014
1015         intel_gt_wait_for_idle(gt, MAX_SCHEDULE_TIMEOUT);
1016 }
1017
1018 int i915_ggtt_pin(struct i915_vma *vma, struct i915_gem_ww_ctx *ww,
1019                   u32 align, unsigned int flags)
1020 {
1021         struct i915_address_space *vm = vma->vm;
1022         int err;
1023
1024         GEM_BUG_ON(!i915_vma_is_ggtt(vma));
1025
1026         do {
1027                 err = i915_vma_pin_ww(vma, ww, 0, align, flags | PIN_GLOBAL);
1028                 if (err != -ENOSPC) {
1029                         if (!err) {
1030                                 err = i915_vma_wait_for_bind(vma);
1031                                 if (err)
1032                                         i915_vma_unpin(vma);
1033                         }
1034                         return err;
1035                 }
1036
1037                 /* Unlike i915_vma_pin, we don't take no for an answer! */
1038                 flush_idle_contexts(vm->gt);
1039                 if (mutex_lock_interruptible(&vm->mutex) == 0) {
1040                         i915_gem_evict_vm(vm);
1041                         mutex_unlock(&vm->mutex);
1042                 }
1043         } while (1);
1044 }
1045
1046 static void __vma_close(struct i915_vma *vma, struct intel_gt *gt)
1047 {
1048         /*
1049          * We defer actually closing, unbinding and destroying the VMA until
1050          * the next idle point, or if the object is freed in the meantime. By
1051          * postponing the unbind, we allow for it to be resurrected by the
1052          * client, avoiding the work required to rebind the VMA. This is
1053          * advantageous for DRI, where the client/server pass objects
1054          * between themselves, temporarily opening a local VMA to the
1055          * object, and then closing it again. The same object is then reused
1056          * on the next frame (or two, depending on the depth of the swap queue)
1057          * causing us to rebind the VMA once more. This ends up being a lot
1058          * of wasted work for the steady state.
1059          */
1060         GEM_BUG_ON(i915_vma_is_closed(vma));
1061         list_add(&vma->closed_link, &gt->closed_vma);
1062 }
1063
1064 void i915_vma_close(struct i915_vma *vma)
1065 {
1066         struct intel_gt *gt = vma->vm->gt;
1067         unsigned long flags;
1068
1069         if (i915_vma_is_ggtt(vma))
1070                 return;
1071
1072         GEM_BUG_ON(!atomic_read(&vma->open_count));
1073         if (atomic_dec_and_lock_irqsave(&vma->open_count,
1074                                         &gt->closed_lock,
1075                                         flags)) {
1076                 __vma_close(vma, gt);
1077                 spin_unlock_irqrestore(&gt->closed_lock, flags);
1078         }
1079 }
1080
1081 static void __i915_vma_remove_closed(struct i915_vma *vma)
1082 {
1083         struct intel_gt *gt = vma->vm->gt;
1084
1085         spin_lock_irq(&gt->closed_lock);
1086         list_del_init(&vma->closed_link);
1087         spin_unlock_irq(&gt->closed_lock);
1088 }
1089
1090 void i915_vma_reopen(struct i915_vma *vma)
1091 {
1092         if (i915_vma_is_closed(vma))
1093                 __i915_vma_remove_closed(vma);
1094 }
1095
1096 void i915_vma_release(struct kref *ref)
1097 {
1098         struct i915_vma *vma = container_of(ref, typeof(*vma), ref);
1099
1100         if (drm_mm_node_allocated(&vma->node)) {
1101                 mutex_lock(&vma->vm->mutex);
1102                 atomic_and(~I915_VMA_PIN_MASK, &vma->flags);
1103                 WARN_ON(__i915_vma_unbind(vma));
1104                 mutex_unlock(&vma->vm->mutex);
1105                 GEM_BUG_ON(drm_mm_node_allocated(&vma->node));
1106         }
1107         GEM_BUG_ON(i915_vma_is_active(vma));
1108
1109         if (vma->obj) {
1110                 struct drm_i915_gem_object *obj = vma->obj;
1111
1112                 spin_lock(&obj->vma.lock);
1113                 list_del(&vma->obj_link);
1114                 if (!RB_EMPTY_NODE(&vma->obj_node))
1115                         rb_erase(&vma->obj_node, &obj->vma.tree);
1116                 spin_unlock(&obj->vma.lock);
1117         }
1118
1119         __i915_vma_remove_closed(vma);
1120         i915_vm_put(vma->vm);
1121
1122         i915_active_fini(&vma->active);
1123         i915_vma_free(vma);
1124 }
1125
1126 void i915_vma_parked(struct intel_gt *gt)
1127 {
1128         struct i915_vma *vma, *next;
1129         LIST_HEAD(closed);
1130
1131         spin_lock_irq(&gt->closed_lock);
1132         list_for_each_entry_safe(vma, next, &gt->closed_vma, closed_link) {
1133                 struct drm_i915_gem_object *obj = vma->obj;
1134                 struct i915_address_space *vm = vma->vm;
1135
1136                 /* XXX All to avoid keeping a reference on i915_vma itself */
1137
1138                 if (!kref_get_unless_zero(&obj->base.refcount))
1139                         continue;
1140
1141                 if (!i915_vm_tryopen(vm)) {
1142                         i915_gem_object_put(obj);
1143                         continue;
1144                 }
1145
1146                 list_move(&vma->closed_link, &closed);
1147         }
1148         spin_unlock_irq(&gt->closed_lock);
1149
1150         /* As the GT is held idle, no vma can be reopened as we destroy them */
1151         list_for_each_entry_safe(vma, next, &closed, closed_link) {
1152                 struct drm_i915_gem_object *obj = vma->obj;
1153                 struct i915_address_space *vm = vma->vm;
1154
1155                 INIT_LIST_HEAD(&vma->closed_link);
1156                 __i915_vma_put(vma);
1157
1158                 i915_gem_object_put(obj);
1159                 i915_vm_close(vm);
1160         }
1161 }
1162
1163 static void __i915_vma_iounmap(struct i915_vma *vma)
1164 {
1165         GEM_BUG_ON(i915_vma_is_pinned(vma));
1166
1167         if (vma->iomap == NULL)
1168                 return;
1169
1170         io_mapping_unmap(vma->iomap);
1171         vma->iomap = NULL;
1172 }
1173
1174 void i915_vma_revoke_mmap(struct i915_vma *vma)
1175 {
1176         struct drm_vma_offset_node *node;
1177         u64 vma_offset;
1178
1179         if (!i915_vma_has_userfault(vma))
1180                 return;
1181
1182         GEM_BUG_ON(!i915_vma_is_map_and_fenceable(vma));
1183         GEM_BUG_ON(!vma->obj->userfault_count);
1184
1185         node = &vma->mmo->vma_node;
1186         vma_offset = vma->ggtt_view.partial.offset << PAGE_SHIFT;
1187         unmap_mapping_range(vma->vm->i915->drm.anon_inode->i_mapping,
1188                             drm_vma_node_offset_addr(node) + vma_offset,
1189                             vma->size,
1190                             1);
1191
1192         i915_vma_unset_userfault(vma);
1193         if (!--vma->obj->userfault_count)
1194                 list_del(&vma->obj->userfault_link);
1195 }
1196
1197 static int
1198 __i915_request_await_bind(struct i915_request *rq, struct i915_vma *vma)
1199 {
1200         return __i915_request_await_exclusive(rq, &vma->active);
1201 }
1202
1203 int __i915_vma_move_to_active(struct i915_vma *vma, struct i915_request *rq)
1204 {
1205         int err;
1206
1207         GEM_BUG_ON(!i915_vma_is_pinned(vma));
1208
1209         /* Wait for the vma to be bound before we start! */
1210         err = __i915_request_await_bind(rq, vma);
1211         if (err)
1212                 return err;
1213
1214         return i915_active_add_request(&vma->active, rq);
1215 }
1216
1217 int i915_vma_move_to_active(struct i915_vma *vma,
1218                             struct i915_request *rq,
1219                             unsigned int flags)
1220 {
1221         struct drm_i915_gem_object *obj = vma->obj;
1222         int err;
1223
1224         assert_object_held(obj);
1225
1226         err = __i915_vma_move_to_active(vma, rq);
1227         if (unlikely(err))
1228                 return err;
1229
1230         if (flags & EXEC_OBJECT_WRITE) {
1231                 struct intel_frontbuffer *front;
1232
1233                 front = __intel_frontbuffer_get(obj);
1234                 if (unlikely(front)) {
1235                         if (intel_frontbuffer_invalidate(front, ORIGIN_CS))
1236                                 i915_active_add_request(&front->write, rq);
1237                         intel_frontbuffer_put(front);
1238                 }
1239
1240                 dma_resv_add_excl_fence(vma->resv, &rq->fence);
1241                 obj->write_domain = I915_GEM_DOMAIN_RENDER;
1242                 obj->read_domains = 0;
1243         } else {
1244                 err = dma_resv_reserve_shared(vma->resv, 1);
1245                 if (unlikely(err))
1246                         return err;
1247
1248                 dma_resv_add_shared_fence(vma->resv, &rq->fence);
1249                 obj->write_domain = 0;
1250         }
1251
1252         if (flags & EXEC_OBJECT_NEEDS_FENCE && vma->fence)
1253                 i915_active_add_request(&vma->fence->active, rq);
1254
1255         obj->read_domains |= I915_GEM_GPU_DOMAINS;
1256         obj->mm.dirty = true;
1257
1258         GEM_BUG_ON(!i915_vma_is_active(vma));
1259         return 0;
1260 }
1261
1262 void __i915_vma_evict(struct i915_vma *vma)
1263 {
1264         GEM_BUG_ON(i915_vma_is_pinned(vma));
1265
1266         if (i915_vma_is_map_and_fenceable(vma)) {
1267                 /* Force a pagefault for domain tracking on next user access */
1268                 i915_vma_revoke_mmap(vma);
1269
1270                 /*
1271                  * Check that we have flushed all writes through the GGTT
1272                  * before the unbind, other due to non-strict nature of those
1273                  * indirect writes they may end up referencing the GGTT PTE
1274                  * after the unbind.
1275                  *
1276                  * Note that we may be concurrently poking at the GGTT_WRITE
1277                  * bit from set-domain, as we mark all GGTT vma associated
1278                  * with an object. We know this is for another vma, as we
1279                  * are currently unbinding this one -- so if this vma will be
1280                  * reused, it will be refaulted and have its dirty bit set
1281                  * before the next write.
1282                  */
1283                 i915_vma_flush_writes(vma);
1284
1285                 /* release the fence reg _after_ flushing */
1286                 i915_vma_revoke_fence(vma);
1287
1288                 __i915_vma_iounmap(vma);
1289                 clear_bit(I915_VMA_CAN_FENCE_BIT, __i915_vma_flags(vma));
1290         }
1291         GEM_BUG_ON(vma->fence);
1292         GEM_BUG_ON(i915_vma_has_userfault(vma));
1293
1294         if (likely(atomic_read(&vma->vm->open))) {
1295                 trace_i915_vma_unbind(vma);
1296                 vma->ops->unbind_vma(vma->vm, vma);
1297         }
1298         atomic_and(~(I915_VMA_BIND_MASK | I915_VMA_ERROR | I915_VMA_GGTT_WRITE),
1299                    &vma->flags);
1300
1301         i915_vma_detach(vma);
1302         vma_unbind_pages(vma);
1303 }
1304
1305 int __i915_vma_unbind(struct i915_vma *vma)
1306 {
1307         int ret;
1308
1309         lockdep_assert_held(&vma->vm->mutex);
1310
1311         if (!drm_mm_node_allocated(&vma->node))
1312                 return 0;
1313
1314         if (i915_vma_is_pinned(vma)) {
1315                 vma_print_allocator(vma, "is pinned");
1316                 return -EAGAIN;
1317         }
1318
1319         /*
1320          * After confirming that no one else is pinning this vma, wait for
1321          * any laggards who may have crept in during the wait (through
1322          * a residual pin skipping the vm->mutex) to complete.
1323          */
1324         ret = i915_vma_sync(vma);
1325         if (ret)
1326                 return ret;
1327
1328         GEM_BUG_ON(i915_vma_is_active(vma));
1329         __i915_vma_evict(vma);
1330
1331         drm_mm_remove_node(&vma->node); /* pairs with i915_vma_release() */
1332         return 0;
1333 }
1334
1335 int i915_vma_unbind(struct i915_vma *vma)
1336 {
1337         struct i915_address_space *vm = vma->vm;
1338         intel_wakeref_t wakeref = 0;
1339         int err;
1340
1341         /* Optimistic wait before taking the mutex */
1342         err = i915_vma_sync(vma);
1343         if (err)
1344                 return err;
1345
1346         if (!drm_mm_node_allocated(&vma->node))
1347                 return 0;
1348
1349         if (i915_vma_is_pinned(vma)) {
1350                 vma_print_allocator(vma, "is pinned");
1351                 return -EAGAIN;
1352         }
1353
1354         if (i915_vma_is_bound(vma, I915_VMA_GLOBAL_BIND))
1355                 /* XXX not always required: nop_clear_range */
1356                 wakeref = intel_runtime_pm_get(&vm->i915->runtime_pm);
1357
1358         err = mutex_lock_interruptible_nested(&vma->vm->mutex, !wakeref);
1359         if (err)
1360                 goto out_rpm;
1361
1362         err = __i915_vma_unbind(vma);
1363         mutex_unlock(&vm->mutex);
1364
1365 out_rpm:
1366         if (wakeref)
1367                 intel_runtime_pm_put(&vm->i915->runtime_pm, wakeref);
1368         return err;
1369 }
1370
1371 struct i915_vma *i915_vma_make_unshrinkable(struct i915_vma *vma)
1372 {
1373         i915_gem_object_make_unshrinkable(vma->obj);
1374         return vma;
1375 }
1376
1377 void i915_vma_make_shrinkable(struct i915_vma *vma)
1378 {
1379         i915_gem_object_make_shrinkable(vma->obj);
1380 }
1381
1382 void i915_vma_make_purgeable(struct i915_vma *vma)
1383 {
1384         i915_gem_object_make_purgeable(vma->obj);
1385 }
1386
1387 #if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
1388 #include "selftests/i915_vma.c"
1389 #endif
1390
1391 static void i915_global_vma_shrink(void)
1392 {
1393         kmem_cache_shrink(global.slab_vmas);
1394 }
1395
1396 static void i915_global_vma_exit(void)
1397 {
1398         kmem_cache_destroy(global.slab_vmas);
1399 }
1400
1401 static struct i915_global_vma global = { {
1402         .shrink = i915_global_vma_shrink,
1403         .exit = i915_global_vma_exit,
1404 } };
1405
1406 int __init i915_global_vma_init(void)
1407 {
1408         global.slab_vmas = KMEM_CACHE(i915_vma, SLAB_HWCACHE_ALIGN);
1409         if (!global.slab_vmas)
1410                 return -ENOMEM;
1411
1412         i915_global_register(&global.base);
1413         return 0;
1414 }