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
  42static struct i915_global_vma {
  43	struct i915_global base;
  44	struct kmem_cache *slab_vmas;
  45} global;
  46
  47struct i915_vma *i915_vma_alloc(void)
  48{
  49	return kmem_cache_zalloc(global.slab_vmas, GFP_KERNEL);
  50}
  51
  52void 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
  61static 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
  81static void vma_print_allocator(struct i915_vma *vma, const char *reason)
  82{
  83}
  84
  85#endif
 
 
 
 
 
  86
  87static inline struct i915_vma *active_to_vma(struct i915_active *ref)
  88{
  89	return container_of(ref, typeof(struct i915_vma), active);
  90}
 
 
 
 
  91
  92static int __i915_vma_active(struct i915_active *ref)
  93{
  94	return i915_vma_tryget(active_to_vma(ref)) ? 0 : -ENOENT;
  95}
  96
  97static void __i915_vma_retire(struct i915_active *ref)
  98{
  99	i915_vma_put(active_to_vma(ref));
 
 100}
 101
 102static struct i915_vma *
 103vma_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
 224err_unlock:
 225	spin_unlock(&obj->vma.lock);
 226err_vma:
 227	i915_vm_put(vm);
 228	i915_vma_free(vma);
 229	return pos;
 230}
 231
 232static struct i915_vma *
 233i915_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 */
 270struct i915_vma *
 271i915_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
 292struct 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
 303static 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
 313static 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
 326static const struct dma_fence_work_ops bind_ops = {
 327	.name = "bind",
 328	.work = __vma_bind,
 329	.release = __vma_release,
 330};
 331
 332struct 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
 346int 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 */
 376int 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
 446void __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
 498err_unpin:
 499	__i915_vma_unpin(vma);
 500err:
 501	return IO_ERR_PTR(err);
 502}
 503
 504void 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
 510void 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
 520void 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
 540bool 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
 570void __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
 588bool 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 */
 634static int
 635i915_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
 743static void
 744i915_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
 757static 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
 778unpinned:
 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
 800static 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
 829unlock:
 830	mutex_unlock(&vma->pages_mutex);
 831unpin:
 832	if (pinned_pages)
 833		__i915_gem_object_unpin_pages(vma->obj);
 834
 835	return err;
 836}
 837
 838static 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
 852static 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
 860static 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
 874int 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
1006err_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	}
1011err_active:
1012	i915_active_release(&vma->active);
1013err_unlock:
1014	mutex_unlock(&vma->vm->mutex);
1015err_fence:
1016	if (work)
1017		dma_fence_work_commit_imm(&work->base);
1018err_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
1025static 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
1036int 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
1071static 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
1089void 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
1106static 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
1115void i915_vma_reopen(struct i915_vma *vma)
1116{
1117	if (i915_vma_is_closed(vma))
1118		__i915_vma_remove_closed(vma);
1119}
1120
1121void 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
1151void 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
1188static 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
1199void 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
1222static 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
1228int __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
1242int 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
1289void __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
1332int __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
1362int 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
1392out_rpm:
1393	if (wakeref)
1394		intel_runtime_pm_put(&vm->i915->runtime_pm, wakeref);
1395	return err;
1396}
1397
1398struct i915_vma *i915_vma_make_unshrinkable(struct i915_vma *vma)
1399{
1400	i915_gem_object_make_unshrinkable(vma->obj);
1401	return vma;
1402}
1403
1404void i915_vma_make_shrinkable(struct i915_vma *vma)
1405{
1406	i915_gem_object_make_shrinkable(vma->obj);
1407}
1408
1409void 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
1418static void i915_global_vma_shrink(void)
1419{
1420	kmem_cache_shrink(global.slab_vmas);
1421}
1422
1423static void i915_global_vma_exit(void)
1424{
1425	kmem_cache_destroy(global.slab_vmas);
1426}
1427
1428static struct i915_global_vma global = { {
1429	.shrink = i915_global_vma_shrink,
1430	.exit = i915_global_vma_exit,
1431} };
1432
1433int __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}