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 "gem/i915_gem_lmem.h"
  31 #include "gt/intel_engine.h"
  32 #include "gt/intel_engine_heartbeat.h"
  33 #include "gt/intel_gt.h"
  34 #include "gt/intel_gt_requests.h"
  35
  36 #include "i915_drv.h"
  37 #include "i915_globals.h"
  38 #include "i915_sw_fence_work.h"
  39 #include "i915_trace.h"
  40 #include "i915_vma.h"
  41
  42 static struct i915_global_vma {
  43         struct i915_global base;
  44         struct kmem_cache *slab_vmas;
  45 } global;
  46
  47 struct i915_vma *i915_vma_alloc(void)
  48 {
  49         return kmem_cache_zalloc(global.slab_vmas, GFP_KERNEL);
  50 }
  51
  52 void i915_vma_free(struct i915_vma *vma)
  53 {
  54         return kmem_cache_free(global.slab_vmas, vma);
  55 }
  56
  57 #if IS_ENABLED(CONFIG_DRM_I915_ERRLOG_GEM) && IS_ENABLED(CONFIG_DRM_DEBUG_MM)
  58
  59 #include <linux/stackdepot.h>
  60
  61 static void vma_print_allocator(struct i915_vma *vma, const char *reason)
  62 {
  63         unsigned long *entries;
  64         unsigned int nr_entries;
  65         char buf[512];
  66
  67         if (!vma->node.stack) {
  68                 DRM_DEBUG_DRIVER("vma.node [%08llx + %08llx] %s: unknown owner\n",
  69                                  vma->node.start, vma->node.size, reason);
  70                 return;
  71         }
  72
  73         nr_entries = stack_depot_fetch(vma->node.stack, &entries);
  74         stack_trace_snprint(buf, sizeof(buf), entries, nr_entries, 0);
  75         DRM_DEBUG_DRIVER("vma.node [%08llx + %08llx] %s: inserted at %s\n",
  76                          vma->node.start, vma->node.size, reason, buf);
  77 }
  78
  79 #else
  80
  81 static void vma_print_allocator(struct i915_vma *vma, const char *reason)
  82 {
  83 }
  84
  85 #endif
  86
  87 static inline struct i915_vma *active_to_vma(struct i915_active *ref)
  88 {
  89         return container_of(ref, typeof(struct i915_vma), active);
  90 }
  91
  92 static int __i915_vma_active(struct i915_active *ref)
  93 {
  94         return i915_vma_tryget(active_to_vma(ref)) ? 0 : -ENOENT;
  95 }
  96
  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, 0);
 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 i915_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_or_dpt(vm));
 278         GEM_BUG_ON(!atomic_read(&vm->open));
 279
 280         spin_lock(&obj->vma.lock);
 281         vma = i915_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         atomic_or(bind_flags, &vma->flags);
 443         return 0;
 444 }
 445
 446 void __iomem *i915_vma_pin_iomap(struct i915_vma *vma)
 447 {
 448         void __iomem *ptr;
 449         int err;
 450
 451         if (!i915_gem_object_is_lmem(vma->obj)) {
 452                 if (GEM_WARN_ON(!i915_vma_is_map_and_fenceable(vma))) {
 453                         err = -ENODEV;
 454                         goto err;
 455                 }
 456         }
 457
 458         GEM_BUG_ON(!i915_vma_is_ggtt(vma));
 459         GEM_BUG_ON(!i915_vma_is_bound(vma, I915_VMA_GLOBAL_BIND));
 460
 461         ptr = READ_ONCE(vma->iomap);
 462         if (ptr == NULL) {
 463                 /*
 464                  * TODO: consider just using i915_gem_object_pin_map() for lmem
 465                  * instead, which already supports mapping non-contiguous chunks
 466                  * of pages, that way we can also drop the
 467                  * I915_BO_ALLOC_CONTIGUOUS when allocating the object.
 468                  */
 469                 if (i915_gem_object_is_lmem(vma->obj))
 470                         ptr = i915_gem_object_lmem_io_map(vma->obj, 0,
 471                                                           vma->obj->base.size);
 472                 else
 473                         ptr = io_mapping_map_wc(&i915_vm_to_ggtt(vma->vm)->iomap,
 474                                                 vma->node.start,
 475                                                 vma->node.size);
 476                 if (ptr == NULL) {
 477                         err = -ENOMEM;
 478                         goto err;
 479                 }
 480
 481                 if (unlikely(cmpxchg(&vma->iomap, NULL, ptr))) {
 482                         io_mapping_unmap(ptr);
 483                         ptr = vma->iomap;
 484                 }
 485         }
 486
 487         __i915_vma_pin(vma);
 488
 489         err = i915_vma_pin_fence(vma);
 490         if (err)
 491                 goto err_unpin;
 492
 493         i915_vma_set_ggtt_write(vma);
 494
 495         /* NB Access through the GTT requires the device to be awake. */
 496         return ptr;
 497
 498 err_unpin:
 499         __i915_vma_unpin(vma);
 500 err:
 501         return IO_ERR_PTR(err);
 502 }
 503
 504 void i915_vma_flush_writes(struct i915_vma *vma)
 505 {
 506         if (i915_vma_unset_ggtt_write(vma))
 507                 intel_gt_flush_ggtt_writes(vma->vm->gt);
 508 }
 509
 510 void i915_vma_unpin_iomap(struct i915_vma *vma)
 511 {
 512         GEM_BUG_ON(vma->iomap == NULL);
 513
 514         i915_vma_flush_writes(vma);
 515
 516         i915_vma_unpin_fence(vma);
 517         i915_vma_unpin(vma);
 518 }
 519
 520 void i915_vma_unpin_and_release(struct i915_vma **p_vma, unsigned int flags)
 521 {
 522         struct i915_vma *vma;
 523         struct drm_i915_gem_object *obj;
 524
 525         vma = fetch_and_zero(p_vma);
 526         if (!vma)
 527                 return;
 528
 529         obj = vma->obj;
 530         GEM_BUG_ON(!obj);
 531
 532         i915_vma_unpin(vma);
 533
 534         if (flags & I915_VMA_RELEASE_MAP)
 535                 i915_gem_object_unpin_map(obj);
 536
 537         i915_gem_object_put(obj);
 538 }
 539
 540 bool i915_vma_misplaced(const struct i915_vma *vma,
 541                         u64 size, u64 alignment, u64 flags)
 542 {
 543         if (!drm_mm_node_allocated(&vma->node))
 544                 return false;
 545
 546         if (test_bit(I915_VMA_ERROR_BIT, __i915_vma_flags(vma)))
 547                 return true;
 548
 549         if (vma->node.size < size)
 550                 return true;
 551
 552         GEM_BUG_ON(alignment && !is_power_of_2(alignment));
 553         if (alignment && !IS_ALIGNED(vma->node.start, alignment))
 554                 return true;
 555
 556         if (flags & PIN_MAPPABLE && !i915_vma_is_map_and_fenceable(vma))
 557                 return true;
 558
 559         if (flags & PIN_OFFSET_BIAS &&
 560             vma->node.start < (flags & PIN_OFFSET_MASK))
 561                 return true;
 562
 563         if (flags & PIN_OFFSET_FIXED &&
 564             vma->node.start != (flags & PIN_OFFSET_MASK))
 565                 return true;
 566
 567         return false;
 568 }
 569
 570 void __i915_vma_set_map_and_fenceable(struct i915_vma *vma)
 571 {
 572         bool mappable, fenceable;
 573
 574         GEM_BUG_ON(!i915_vma_is_ggtt(vma));
 575         GEM_BUG_ON(!vma->fence_size);
 576
 577         fenceable = (vma->node.size >= vma->fence_size &&
 578                      IS_ALIGNED(vma->node.start, vma->fence_alignment));
 579
 580         mappable = vma->node.start + vma->fence_size <= i915_vm_to_ggtt(vma->vm)->mappable_end;
 581
 582         if (mappable && fenceable)
 583                 set_bit(I915_VMA_CAN_FENCE_BIT, __i915_vma_flags(vma));
 584         else
 585                 clear_bit(I915_VMA_CAN_FENCE_BIT, __i915_vma_flags(vma));
 586 }
 587
 588 bool i915_gem_valid_gtt_space(struct i915_vma *vma, unsigned long color)
 589 {
 590         struct drm_mm_node *node = &vma->node;
 591         struct drm_mm_node *other;
 592
 593         /*
 594          * On some machines we have to be careful when putting differing types
 595          * of snoopable memory together to avoid the prefetcher crossing memory
 596          * domains and dying. During vm initialisation, we decide whether or not
 597          * these constraints apply and set the drm_mm.color_adjust
 598          * appropriately.
 599          */
 600         if (!i915_vm_has_cache_coloring(vma->vm))
 601                 return true;
 602
 603         /* Only valid to be called on an already inserted vma */
 604         GEM_BUG_ON(!drm_mm_node_allocated(node));
 605         GEM_BUG_ON(list_empty(&node->node_list));
 606
 607         other = list_prev_entry(node, node_list);
 608         if (i915_node_color_differs(other, color) &&
 609             !drm_mm_hole_follows(other))
 610                 return false;
 611
 612         other = list_next_entry(node, node_list);
 613         if (i915_node_color_differs(other, color) &&
 614             !drm_mm_hole_follows(node))
 615                 return false;
 616
 617         return true;
 618 }
 619
 620 /**
 621  * i915_vma_insert - finds a slot for the vma in its address space
 622  * @vma: the vma
 623  * @size: requested size in bytes (can be larger than the VMA)
 624  * @alignment: required alignment
 625  * @flags: mask of PIN_* flags to use
 626  *
 627  * First we try to allocate some free space that meets the requirements for
 628  * the VMA. Failiing that, if the flags permit, it will evict an old VMA,
 629  * preferrably the oldest idle entry to make room for the new VMA.
 630  *
 631  * Returns:
 632  * 0 on success, negative error code otherwise.
 633  */
 634 static int
 635 i915_vma_insert(struct i915_vma *vma, u64 size, u64 alignment, u64 flags)
 636 {
 637         unsigned long color;
 638         u64 start, end;
 639         int ret;
 640
 641         GEM_BUG_ON(i915_vma_is_bound(vma, I915_VMA_GLOBAL_BIND | I915_VMA_LOCAL_BIND));
 642         GEM_BUG_ON(drm_mm_node_allocated(&vma->node));
 643
 644         size = max(size, vma->size);
 645         alignment = max(alignment, vma->display_alignment);
 646         if (flags & PIN_MAPPABLE) {
 647                 size = max_t(typeof(size), size, vma->fence_size);
 648                 alignment = max_t(typeof(alignment),
 649                                   alignment, vma->fence_alignment);
 650         }
 651
 652         GEM_BUG_ON(!IS_ALIGNED(size, I915_GTT_PAGE_SIZE));
 653         GEM_BUG_ON(!IS_ALIGNED(alignment, I915_GTT_MIN_ALIGNMENT));
 654         GEM_BUG_ON(!is_power_of_2(alignment));
 655
 656         start = flags & PIN_OFFSET_BIAS ? flags & PIN_OFFSET_MASK : 0;
 657         GEM_BUG_ON(!IS_ALIGNED(start, I915_GTT_PAGE_SIZE));
 658
 659         end = vma->vm->total;
 660         if (flags & PIN_MAPPABLE)
 661                 end = min_t(u64, end, i915_vm_to_ggtt(vma->vm)->mappable_end);
 662         if (flags & PIN_ZONE_4G)
 663                 end = min_t(u64, end, (1ULL << 32) - I915_GTT_PAGE_SIZE);
 664         GEM_BUG_ON(!IS_ALIGNED(end, I915_GTT_PAGE_SIZE));
 665
 666         /* If binding the object/GGTT view requires more space than the entire
 667          * aperture has, reject it early before evicting everything in a vain
 668          * attempt to find space.
 669          */
 670         if (size > end) {
 671                 DRM_DEBUG("Attempting to bind an object larger than the aperture: request=%llu > %s aperture=%llu\n",
 672                           size, flags & PIN_MAPPABLE ? "mappable" : "total",
 673                           end);
 674                 return -ENOSPC;
 675         }
 676
 677         color = 0;
 678         if (vma->obj && i915_vm_has_cache_coloring(vma->vm))
 679                 color = vma->obj->cache_level;
 680
 681         if (flags & PIN_OFFSET_FIXED) {
 682                 u64 offset = flags & PIN_OFFSET_MASK;
 683                 if (!IS_ALIGNED(offset, alignment) ||
 684                     range_overflows(offset, size, end))
 685                         return -EINVAL;
 686
 687                 ret = i915_gem_gtt_reserve(vma->vm, &vma->node,
 688                                            size, offset, color,
 689                                            flags);
 690                 if (ret)
 691                         return ret;
 692         } else {
 693                 /*
 694                  * We only support huge gtt pages through the 48b PPGTT,
 695                  * however we also don't want to force any alignment for
 696                  * objects which need to be tightly packed into the low 32bits.
 697                  *
 698                  * Note that we assume that GGTT are limited to 4GiB for the
 699                  * forseeable future. See also i915_ggtt_offset().
 700                  */
 701                 if (upper_32_bits(end - 1) &&
 702                     vma->page_sizes.sg > I915_GTT_PAGE_SIZE) {
 703                         /*
 704                          * We can't mix 64K and 4K PTEs in the same page-table
 705                          * (2M block), and so to avoid the ugliness and
 706                          * complexity of coloring we opt for just aligning 64K
 707                          * objects to 2M.
 708                          */
 709                         u64 page_alignment =
 710                                 rounddown_pow_of_two(vma->page_sizes.sg |
 711                                                      I915_GTT_PAGE_SIZE_2M);
 712
 713                         /*
 714                          * Check we don't expand for the limited Global GTT
 715                          * (mappable aperture is even more precious!). This
 716                          * also checks that we exclude the aliasing-ppgtt.
 717                          */
 718                         GEM_BUG_ON(i915_vma_is_ggtt(vma));
 719
 720                         alignment = max(alignment, page_alignment);
 721
 722                         if (vma->page_sizes.sg & I915_GTT_PAGE_SIZE_64K)
 723                                 size = round_up(size, I915_GTT_PAGE_SIZE_2M);
 724                 }
 725
 726                 ret = i915_gem_gtt_insert(vma->vm, &vma->node,
 727                                           size, alignment, color,
 728                                           start, end, flags);
 729                 if (ret)
 730                         return ret;
 731
 732                 GEM_BUG_ON(vma->node.start < start);
 733                 GEM_BUG_ON(vma->node.start + vma->node.size > end);
 734         }
 735         GEM_BUG_ON(!drm_mm_node_allocated(&vma->node));
 736         GEM_BUG_ON(!i915_gem_valid_gtt_space(vma, color));
 737
 738         list_add_tail(&vma->vm_link, &vma->vm->bound_list);
 739
 740         return 0;
 741 }
 742
 743 static void
 744 i915_vma_detach(struct i915_vma *vma)
 745 {
 746         GEM_BUG_ON(!drm_mm_node_allocated(&vma->node));
 747         GEM_BUG_ON(i915_vma_is_bound(vma, I915_VMA_GLOBAL_BIND | I915_VMA_LOCAL_BIND));
 748
 749         /*
 750          * And finally now the object is completely decoupled from this
 751          * vma, we can drop its hold on the backing storage and allow
 752          * it to be reaped by the shrinker.
 753          */
 754         list_del(&vma->vm_link);
 755 }
 756
 757 static bool try_qad_pin(struct i915_vma *vma, unsigned int flags)
 758 {
 759         unsigned int bound;
 760         bool pinned = true;
 761
 762         bound = atomic_read(&vma->flags);
 763         do {
 764                 if (unlikely(flags & ~bound))
 765                         return false;
 766
 767                 if (unlikely(bound & (I915_VMA_OVERFLOW | I915_VMA_ERROR)))
 768                         return false;
 769
 770                 if (!(bound & I915_VMA_PIN_MASK))
 771                         goto unpinned;
 772
 773                 GEM_BUG_ON(((bound + 1) & I915_VMA_PIN_MASK) == 0);
 774         } while (!atomic_try_cmpxchg(&vma->flags, &bound, bound + 1));
 775
 776         return true;
 777
 778 unpinned:
 779         /*
 780          * If pin_count==0, but we are bound, check under the lock to avoid
 781          * racing with a concurrent i915_vma_unbind().
 782          */
 783         mutex_lock(&vma->vm->mutex);
 784         do {
 785                 if (unlikely(bound & (I915_VMA_OVERFLOW | I915_VMA_ERROR))) {
 786                         pinned = false;
 787                         break;
 788                 }
 789
 790                 if (unlikely(flags & ~bound)) {
 791                         pinned = false;
 792                         break;
 793                 }
 794         } while (!atomic_try_cmpxchg(&vma->flags, &bound, bound + 1));
 795         mutex_unlock(&vma->vm->mutex);
 796
 797         return pinned;
 798 }
 799
 800 static int vma_get_pages(struct i915_vma *vma)
 801 {
 802         int err = 0;
 803         bool pinned_pages = false;
 804
 805         if (atomic_add_unless(&vma->pages_count, 1, 0))
 806                 return 0;
 807
 808         if (vma->obj) {
 809                 err = i915_gem_object_pin_pages(vma->obj);
 810                 if (err)
 811                         return err;
 812                 pinned_pages = true;
 813         }
 814
 815         /* Allocations ahoy! */
 816         if (mutex_lock_interruptible(&vma->pages_mutex)) {
 817                 err = -EINTR;
 818                 goto unpin;
 819         }
 820
 821         if (!atomic_read(&vma->pages_count)) {
 822                 err = vma->ops->set_pages(vma);
 823                 if (err)
 824                         goto unlock;
 825                 pinned_pages = false;
 826         }
 827         atomic_inc(&vma->pages_count);
 828
 829 unlock:
 830         mutex_unlock(&vma->pages_mutex);
 831 unpin:
 832         if (pinned_pages)
 833                 __i915_gem_object_unpin_pages(vma->obj);
 834
 835         return err;
 836 }
 837
 838 static void __vma_put_pages(struct i915_vma *vma, unsigned int count)
 839 {
 840         /* We allocate under vma_get_pages, so beware the shrinker */
 841         mutex_lock_nested(&vma->pages_mutex, SINGLE_DEPTH_NESTING);
 842         GEM_BUG_ON(atomic_read(&vma->pages_count) < count);
 843         if (atomic_sub_return(count, &vma->pages_count) == 0) {
 844                 vma->ops->clear_pages(vma);
 845                 GEM_BUG_ON(vma->pages);
 846                 if (vma->obj)
 847                         i915_gem_object_unpin_pages(vma->obj);
 848         }
 849         mutex_unlock(&vma->pages_mutex);
 850 }
 851
 852 static void vma_put_pages(struct i915_vma *vma)
 853 {
 854         if (atomic_add_unless(&vma->pages_count, -1, 1))
 855                 return;
 856
 857         __vma_put_pages(vma, 1);
 858 }
 859
 860 static void vma_unbind_pages(struct i915_vma *vma)
 861 {
 862         unsigned int count;
 863
 864         lockdep_assert_held(&vma->vm->mutex);
 865
 866         /* The upper portion of pages_count is the number of bindings */
 867         count = atomic_read(&vma->pages_count);
 868         count >>= I915_VMA_PAGES_BIAS;
 869         GEM_BUG_ON(!count);
 870
 871         __vma_put_pages(vma, count | count << I915_VMA_PAGES_BIAS);
 872 }
 873
 874 int i915_vma_pin_ww(struct i915_vma *vma, struct i915_gem_ww_ctx *ww,
 875                     u64 size, u64 alignment, u64 flags)
 876 {
 877         struct i915_vma_work *work = NULL;
 878         intel_wakeref_t wakeref = 0;
 879         unsigned int bound;
 880         int err;
 881
 882 #ifdef CONFIG_PROVE_LOCKING
 883         if (debug_locks && !WARN_ON(!ww) && vma->resv)
 884                 assert_vma_held(vma);
 885 #endif
 886
 887         BUILD_BUG_ON(PIN_GLOBAL != I915_VMA_GLOBAL_BIND);
 888         BUILD_BUG_ON(PIN_USER != I915_VMA_LOCAL_BIND);
 889
 890         GEM_BUG_ON(!(flags & (PIN_USER | PIN_GLOBAL)));
 891
 892         /* First try and grab the pin without rebinding the vma */
 893         if (try_qad_pin(vma, flags & I915_VMA_BIND_MASK))
 894                 return 0;
 895
 896         err = vma_get_pages(vma);
 897         if (err)
 898                 return err;
 899
 900         if (flags & PIN_GLOBAL)
 901                 wakeref = intel_runtime_pm_get(&vma->vm->i915->runtime_pm);
 902
 903         if (flags & vma->vm->bind_async_flags) {
 904                 /* lock VM */
 905                 err = i915_vm_lock_objects(vma->vm, ww);
 906                 if (err)
 907                         goto err_rpm;
 908
 909                 work = i915_vma_work();
 910                 if (!work) {
 911                         err = -ENOMEM;
 912                         goto err_rpm;
 913                 }
 914
 915                 work->vm = i915_vm_get(vma->vm);
 916
 917                 /* Allocate enough page directories to used PTE */
 918                 if (vma->vm->allocate_va_range) {
 919                         err = i915_vm_alloc_pt_stash(vma->vm,
 920                                                      &work->stash,
 921                                                      vma->size);
 922                         if (err)
 923                                 goto err_fence;
 924
 925                         err = i915_vm_map_pt_stash(vma->vm, &work->stash);
 926                         if (err)
 927                                 goto err_fence;
 928                 }
 929         }
 930
 931         /*
 932          * Differentiate between user/kernel vma inside the aliasing-ppgtt.
 933          *
 934          * We conflate the Global GTT with the user's vma when using the
 935          * aliasing-ppgtt, but it is still vitally important to try and
 936          * keep the use cases distinct. For example, userptr objects are
 937          * not allowed inside the Global GTT as that will cause lock
 938          * inversions when we have to evict them the mmu_notifier callbacks -
 939          * but they are allowed to be part of the user ppGTT which can never
 940          * be mapped. As such we try to give the distinct users of the same
 941          * mutex, distinct lockclasses [equivalent to how we keep i915_ggtt
 942          * and i915_ppgtt separate].
 943          *
 944          * NB this may cause us to mask real lock inversions -- while the
 945          * code is safe today, lockdep may not be able to spot future
 946          * transgressions.
 947          */
 948         err = mutex_lock_interruptible_nested(&vma->vm->mutex,
 949                                               !(flags & PIN_GLOBAL));
 950         if (err)
 951                 goto err_fence;
 952
 953         /* No more allocations allowed now we hold vm->mutex */
 954
 955         if (unlikely(i915_vma_is_closed(vma))) {
 956                 err = -ENOENT;
 957                 goto err_unlock;
 958         }
 959
 960         bound = atomic_read(&vma->flags);
 961         if (unlikely(bound & I915_VMA_ERROR)) {
 962                 err = -ENOMEM;
 963                 goto err_unlock;
 964         }
 965
 966         if (unlikely(!((bound + 1) & I915_VMA_PIN_MASK))) {
 967                 err = -EAGAIN; /* pins are meant to be fairly temporary */
 968                 goto err_unlock;
 969         }
 970
 971         if (unlikely(!(flags & ~bound & I915_VMA_BIND_MASK))) {
 972                 __i915_vma_pin(vma);
 973                 goto err_unlock;
 974         }
 975
 976         err = i915_active_acquire(&vma->active);
 977         if (err)
 978                 goto err_unlock;
 979
 980         if (!(bound & I915_VMA_BIND_MASK)) {
 981                 err = i915_vma_insert(vma, size, alignment, flags);
 982                 if (err)
 983                         goto err_active;
 984
 985                 if (i915_is_ggtt(vma->vm))
 986                         __i915_vma_set_map_and_fenceable(vma);
 987         }
 988
 989         GEM_BUG_ON(!vma->pages);
 990         err = i915_vma_bind(vma,
 991                             vma->obj ? vma->obj->cache_level : 0,
 992                             flags, work);
 993         if (err)
 994                 goto err_remove;
 995
 996         /* There should only be at most 2 active bindings (user, global) */
 997         GEM_BUG_ON(bound + I915_VMA_PAGES_ACTIVE < bound);
 998         atomic_add(I915_VMA_PAGES_ACTIVE, &vma->pages_count);
 999         list_move_tail(&vma->vm_link, &vma->vm->bound_list);
1000
1001         __i915_vma_pin(vma);
1002         GEM_BUG_ON(!i915_vma_is_pinned(vma));
1003         GEM_BUG_ON(!i915_vma_is_bound(vma, flags));
1004         GEM_BUG_ON(i915_vma_misplaced(vma, size, alignment, flags));
1005
1006 err_remove:
1007         if (!i915_vma_is_bound(vma, I915_VMA_BIND_MASK)) {
1008                 i915_vma_detach(vma);
1009                 drm_mm_remove_node(&vma->node);
1010         }
1011 err_active:
1012         i915_active_release(&vma->active);
1013 err_unlock:
1014         mutex_unlock(&vma->vm->mutex);
1015 err_fence:
1016         if (work)
1017                 dma_fence_work_commit_imm(&work->base);
1018 err_rpm:
1019         if (wakeref)
1020                 intel_runtime_pm_put(&vma->vm->i915->runtime_pm, wakeref);
1021         vma_put_pages(vma);
1022         return err;
1023 }
1024
1025 static void flush_idle_contexts(struct intel_gt *gt)
1026 {
1027         struct intel_engine_cs *engine;
1028         enum intel_engine_id id;
1029
1030         for_each_engine(engine, gt, id)
1031                 intel_engine_flush_barriers(engine);
1032
1033         intel_gt_wait_for_idle(gt, MAX_SCHEDULE_TIMEOUT);
1034 }
1035
1036 int i915_ggtt_pin(struct i915_vma *vma, struct i915_gem_ww_ctx *ww,
1037                   u32 align, unsigned int flags)
1038 {
1039         struct i915_address_space *vm = vma->vm;
1040         int err;
1041
1042         GEM_BUG_ON(!i915_vma_is_ggtt(vma));
1043
1044 #ifdef CONFIG_LOCKDEP
1045         WARN_ON(!ww && vma->resv && dma_resv_held(vma->resv));
1046 #endif
1047
1048         do {
1049                 if (ww)
1050                         err = i915_vma_pin_ww(vma, ww, 0, align, flags | PIN_GLOBAL);
1051                 else
1052                         err = i915_vma_pin(vma, 0, align, flags | PIN_GLOBAL);
1053                 if (err != -ENOSPC) {
1054                         if (!err) {
1055                                 err = i915_vma_wait_for_bind(vma);
1056                                 if (err)
1057                                         i915_vma_unpin(vma);
1058                         }
1059                         return err;
1060                 }
1061
1062                 /* Unlike i915_vma_pin, we don't take no for an answer! */
1063                 flush_idle_contexts(vm->gt);
1064                 if (mutex_lock_interruptible(&vm->mutex) == 0) {
1065                         i915_gem_evict_vm(vm);
1066                         mutex_unlock(&vm->mutex);
1067                 }
1068         } while (1);
1069 }
1070
1071 static void __vma_close(struct i915_vma *vma, struct intel_gt *gt)
1072 {
1073         /*
1074          * We defer actually closing, unbinding and destroying the VMA until
1075          * the next idle point, or if the object is freed in the meantime. By
1076          * postponing the unbind, we allow for it to be resurrected by the
1077          * client, avoiding the work required to rebind the VMA. This is
1078          * advantageous for DRI, where the client/server pass objects
1079          * between themselves, temporarily opening a local VMA to the
1080          * object, and then closing it again. The same object is then reused
1081          * on the next frame (or two, depending on the depth of the swap queue)
1082          * causing us to rebind the VMA once more. This ends up being a lot
1083          * of wasted work for the steady state.
1084          */
1085         GEM_BUG_ON(i915_vma_is_closed(vma));
1086         list_add(&vma->closed_link, &gt->closed_vma);
1087 }
1088
1089 void i915_vma_close(struct i915_vma *vma)
1090 {
1091         struct intel_gt *gt = vma->vm->gt;
1092         unsigned long flags;
1093
1094         if (i915_vma_is_ggtt(vma))
1095                 return;
1096
1097         GEM_BUG_ON(!atomic_read(&vma->open_count));
1098         if (atomic_dec_and_lock_irqsave(&vma->open_count,
1099                                         &gt->closed_lock,
1100                                         flags)) {
1101                 __vma_close(vma, gt);
1102                 spin_unlock_irqrestore(&gt->closed_lock, flags);
1103         }
1104 }
1105
1106 static void __i915_vma_remove_closed(struct i915_vma *vma)
1107 {
1108         struct intel_gt *gt = vma->vm->gt;
1109
1110         spin_lock_irq(&gt->closed_lock);
1111         list_del_init(&vma->closed_link);
1112         spin_unlock_irq(&gt->closed_lock);
1113 }
1114
1115 void i915_vma_reopen(struct i915_vma *vma)
1116 {
1117         if (i915_vma_is_closed(vma))
1118                 __i915_vma_remove_closed(vma);
1119 }
1120
1121 void i915_vma_release(struct kref *ref)
1122 {
1123         struct i915_vma *vma = container_of(ref, typeof(*vma), ref);
1124
1125         if (drm_mm_node_allocated(&vma->node)) {
1126                 mutex_lock(&vma->vm->mutex);
1127                 atomic_and(~I915_VMA_PIN_MASK, &vma->flags);
1128                 WARN_ON(__i915_vma_unbind(vma));
1129                 mutex_unlock(&vma->vm->mutex);
1130                 GEM_BUG_ON(drm_mm_node_allocated(&vma->node));
1131         }
1132         GEM_BUG_ON(i915_vma_is_active(vma));
1133
1134         if (vma->obj) {
1135                 struct drm_i915_gem_object *obj = vma->obj;
1136
1137                 spin_lock(&obj->vma.lock);
1138                 list_del(&vma->obj_link);
1139                 if (!RB_EMPTY_NODE(&vma->obj_node))
1140                         rb_erase(&vma->obj_node, &obj->vma.tree);
1141                 spin_unlock(&obj->vma.lock);
1142         }
1143
1144         __i915_vma_remove_closed(vma);
1145         i915_vm_put(vma->vm);
1146
1147         i915_active_fini(&vma->active);
1148         i915_vma_free(vma);
1149 }
1150
1151 void i915_vma_parked(struct intel_gt *gt)
1152 {
1153         struct i915_vma *vma, *next;
1154         LIST_HEAD(closed);
1155
1156         spin_lock_irq(&gt->closed_lock);
1157         list_for_each_entry_safe(vma, next, &gt->closed_vma, closed_link) {
1158                 struct drm_i915_gem_object *obj = vma->obj;
1159                 struct i915_address_space *vm = vma->vm;
1160
1161                 /* XXX All to avoid keeping a reference on i915_vma itself */
1162
1163                 if (!kref_get_unless_zero(&obj->base.refcount))
1164                         continue;
1165
1166                 if (!i915_vm_tryopen(vm)) {
1167                         i915_gem_object_put(obj);
1168                         continue;
1169                 }
1170
1171                 list_move(&vma->closed_link, &closed);
1172         }
1173         spin_unlock_irq(&gt->closed_lock);
1174
1175         /* As the GT is held idle, no vma can be reopened as we destroy them */
1176         list_for_each_entry_safe(vma, next, &closed, closed_link) {
1177                 struct drm_i915_gem_object *obj = vma->obj;
1178                 struct i915_address_space *vm = vma->vm;
1179
1180                 INIT_LIST_HEAD(&vma->closed_link);
1181                 __i915_vma_put(vma);
1182
1183                 i915_gem_object_put(obj);
1184                 i915_vm_close(vm);
1185         }
1186 }
1187
1188 static void __i915_vma_iounmap(struct i915_vma *vma)
1189 {
1190         GEM_BUG_ON(i915_vma_is_pinned(vma));
1191
1192         if (vma->iomap == NULL)
1193                 return;
1194
1195         io_mapping_unmap(vma->iomap);
1196         vma->iomap = NULL;
1197 }
1198
1199 void i915_vma_revoke_mmap(struct i915_vma *vma)
1200 {
1201         struct drm_vma_offset_node *node;
1202         u64 vma_offset;
1203
1204         if (!i915_vma_has_userfault(vma))
1205                 return;
1206
1207         GEM_BUG_ON(!i915_vma_is_map_and_fenceable(vma));
1208         GEM_BUG_ON(!vma->obj->userfault_count);
1209
1210         node = &vma->mmo->vma_node;
1211         vma_offset = vma->ggtt_view.partial.offset << PAGE_SHIFT;
1212         unmap_mapping_range(vma->vm->i915->drm.anon_inode->i_mapping,
1213                             drm_vma_node_offset_addr(node) + vma_offset,
1214                             vma->size,
1215                             1);
1216
1217         i915_vma_unset_userfault(vma);
1218         if (!--vma->obj->userfault_count)
1219                 list_del(&vma->obj->userfault_link);
1220 }
1221
1222 static int
1223 __i915_request_await_bind(struct i915_request *rq, struct i915_vma *vma)
1224 {
1225         return __i915_request_await_exclusive(rq, &vma->active);
1226 }
1227
1228 int __i915_vma_move_to_active(struct i915_vma *vma, struct i915_request *rq)
1229 {
1230         int err;
1231
1232         GEM_BUG_ON(!i915_vma_is_pinned(vma));
1233
1234         /* Wait for the vma to be bound before we start! */
1235         err = __i915_request_await_bind(rq, vma);
1236         if (err)
1237                 return err;
1238
1239         return i915_active_add_request(&vma->active, rq);
1240 }
1241
1242 int i915_vma_move_to_active(struct i915_vma *vma,
1243                             struct i915_request *rq,
1244                             unsigned int flags)
1245 {
1246         struct drm_i915_gem_object *obj = vma->obj;
1247         int err;
1248
1249         assert_object_held(obj);
1250
1251         err = __i915_vma_move_to_active(vma, rq);
1252         if (unlikely(err))
1253                 return err;
1254
1255         if (flags & EXEC_OBJECT_WRITE) {
1256                 struct intel_frontbuffer *front;
1257
1258                 front = __intel_frontbuffer_get(obj);
1259                 if (unlikely(front)) {
1260                         if (intel_frontbuffer_invalidate(front, ORIGIN_CS))
1261                                 i915_active_add_request(&front->write, rq);
1262                         intel_frontbuffer_put(front);
1263                 }
1264
1265                 dma_resv_add_excl_fence(vma->resv, &rq->fence);
1266                 obj->write_domain = I915_GEM_DOMAIN_RENDER;
1267                 obj->read_domains = 0;
1268         } else {
1269                 if (!(flags & __EXEC_OBJECT_NO_RESERVE)) {
1270                         err = dma_resv_reserve_shared(vma->resv, 1);
1271                         if (unlikely(err))
1272                                 return err;
1273                 }
1274
1275                 dma_resv_add_shared_fence(vma->resv, &rq->fence);
1276                 obj->write_domain = 0;
1277         }
1278
1279         if (flags & EXEC_OBJECT_NEEDS_FENCE && vma->fence)
1280                 i915_active_add_request(&vma->fence->active, rq);
1281
1282         obj->read_domains |= I915_GEM_GPU_DOMAINS;
1283         obj->mm.dirty = true;
1284
1285         GEM_BUG_ON(!i915_vma_is_active(vma));
1286         return 0;
1287 }
1288
1289 void __i915_vma_evict(struct i915_vma *vma)
1290 {
1291         GEM_BUG_ON(i915_vma_is_pinned(vma));
1292
1293         if (i915_vma_is_map_and_fenceable(vma)) {
1294                 /* Force a pagefault for domain tracking on next user access */
1295                 i915_vma_revoke_mmap(vma);
1296
1297                 /*
1298                  * Check that we have flushed all writes through the GGTT
1299                  * before the unbind, other due to non-strict nature of those
1300                  * indirect writes they may end up referencing the GGTT PTE
1301                  * after the unbind.
1302                  *
1303                  * Note that we may be concurrently poking at the GGTT_WRITE
1304                  * bit from set-domain, as we mark all GGTT vma associated
1305                  * with an object. We know this is for another vma, as we
1306                  * are currently unbinding this one -- so if this vma will be
1307                  * reused, it will be refaulted and have its dirty bit set
1308                  * before the next write.
1309                  */
1310                 i915_vma_flush_writes(vma);
1311
1312                 /* release the fence reg _after_ flushing */
1313                 i915_vma_revoke_fence(vma);
1314
1315                 __i915_vma_iounmap(vma);
1316                 clear_bit(I915_VMA_CAN_FENCE_BIT, __i915_vma_flags(vma));
1317         }
1318         GEM_BUG_ON(vma->fence);
1319         GEM_BUG_ON(i915_vma_has_userfault(vma));
1320
1321         if (likely(atomic_read(&vma->vm->open))) {
1322                 trace_i915_vma_unbind(vma);
1323                 vma->ops->unbind_vma(vma->vm, vma);
1324         }
1325         atomic_and(~(I915_VMA_BIND_MASK | I915_VMA_ERROR | I915_VMA_GGTT_WRITE),
1326                    &vma->flags);
1327
1328         i915_vma_detach(vma);
1329         vma_unbind_pages(vma);
1330 }
1331
1332 int __i915_vma_unbind(struct i915_vma *vma)
1333 {
1334         int ret;
1335
1336         lockdep_assert_held(&vma->vm->mutex);
1337
1338         if (!drm_mm_node_allocated(&vma->node))
1339                 return 0;
1340
1341         if (i915_vma_is_pinned(vma)) {
1342                 vma_print_allocator(vma, "is pinned");
1343                 return -EAGAIN;
1344         }
1345
1346         /*
1347          * After confirming that no one else is pinning this vma, wait for
1348          * any laggards who may have crept in during the wait (through
1349          * a residual pin skipping the vm->mutex) to complete.
1350          */
1351         ret = i915_vma_sync(vma);
1352         if (ret)
1353                 return ret;
1354
1355         GEM_BUG_ON(i915_vma_is_active(vma));
1356         __i915_vma_evict(vma);
1357
1358         drm_mm_remove_node(&vma->node); /* pairs with i915_vma_release() */
1359         return 0;
1360 }
1361
1362 int i915_vma_unbind(struct i915_vma *vma)
1363 {
1364         struct i915_address_space *vm = vma->vm;
1365         intel_wakeref_t wakeref = 0;
1366         int err;
1367
1368         /* Optimistic wait before taking the mutex */
1369         err = i915_vma_sync(vma);
1370         if (err)
1371                 return err;
1372
1373         if (!drm_mm_node_allocated(&vma->node))
1374                 return 0;
1375
1376         if (i915_vma_is_pinned(vma)) {
1377                 vma_print_allocator(vma, "is pinned");
1378                 return -EAGAIN;
1379         }
1380
1381         if (i915_vma_is_bound(vma, I915_VMA_GLOBAL_BIND))
1382                 /* XXX not always required: nop_clear_range */
1383                 wakeref = intel_runtime_pm_get(&vm->i915->runtime_pm);
1384
1385         err = mutex_lock_interruptible_nested(&vma->vm->mutex, !wakeref);
1386         if (err)
1387                 goto out_rpm;
1388
1389         err = __i915_vma_unbind(vma);
1390         mutex_unlock(&vm->mutex);
1391
1392 out_rpm:
1393         if (wakeref)
1394                 intel_runtime_pm_put(&vm->i915->runtime_pm, wakeref);
1395         return err;
1396 }
1397
1398 struct i915_vma *i915_vma_make_unshrinkable(struct i915_vma *vma)
1399 {
1400         i915_gem_object_make_unshrinkable(vma->obj);
1401         return vma;
1402 }
1403
1404 void i915_vma_make_shrinkable(struct i915_vma *vma)
1405 {
1406         i915_gem_object_make_shrinkable(vma->obj);
1407 }
1408
1409 void i915_vma_make_purgeable(struct i915_vma *vma)
1410 {
1411         i915_gem_object_make_purgeable(vma->obj);
1412 }
1413
1414 #if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
1415 #include "selftests/i915_vma.c"
1416 #endif
1417
1418 static void i915_global_vma_shrink(void)
1419 {
1420         kmem_cache_shrink(global.slab_vmas);
1421 }
1422
1423 static void i915_global_vma_exit(void)
1424 {
1425         kmem_cache_destroy(global.slab_vmas);
1426 }
1427
1428 static struct i915_global_vma global = { {
1429         .shrink = i915_global_vma_shrink,
1430         .exit = i915_global_vma_exit,
1431 } };
1432
1433 int __init i915_global_vma_init(void)
1434 {
1435         global.slab_vmas = KMEM_CACHE(i915_vma, SLAB_HWCACHE_ALIGN);
1436         if (!global.slab_vmas)
1437                 return -ENOMEM;
1438
1439         i915_global_register(&global.base);
1440         return 0;
1441 }