Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 2197 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/i915_vma.c b/drivers/gpu/drm/i915/i915_vma.c
new file mode 100644
index 000000000..c8ad8f37e
--- /dev/null
+++ b/drivers/gpu/drm/i915/i915_vma.c
@@ -0,0 +1,2197 @@
+/*
+ * Copyright © 2016 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ *
+ */
+
+#include <linux/sched/mm.h>
+#include <linux/dma-fence-array.h>
+#include <drm/drm_gem.h>
+
+#include "display/intel_frontbuffer.h"
+#include "gem/i915_gem_lmem.h"
+#include "gem/i915_gem_tiling.h"
+#include "gt/intel_engine.h"
+#include "gt/intel_engine_heartbeat.h"
+#include "gt/intel_gt.h"
+#include "gt/intel_gt_requests.h"
+
+#include "i915_drv.h"
+#include "i915_gem_evict.h"
+#include "i915_sw_fence_work.h"
+#include "i915_trace.h"
+#include "i915_vma.h"
+#include "i915_vma_resource.h"
+
+static inline void assert_vma_held_evict(const struct i915_vma *vma)
+{
+	/*
+	 * We may be forced to unbind when the vm is dead, to clean it up.
+	 * This is the only exception to the requirement of the object lock
+	 * being held.
+	 */
+	if (kref_read(&vma->vm->ref))
+		assert_object_held_shared(vma->obj);
+}
+
+static struct kmem_cache *slab_vmas;
+
+static struct i915_vma *i915_vma_alloc(void)
+{
+	return kmem_cache_zalloc(slab_vmas, GFP_KERNEL);
+}
+
+static void i915_vma_free(struct i915_vma *vma)
+{
+	return kmem_cache_free(slab_vmas, vma);
+}
+
+#if IS_ENABLED(CONFIG_DRM_I915_ERRLOG_GEM) && IS_ENABLED(CONFIG_DRM_DEBUG_MM)
+
+#include <linux/stackdepot.h>
+
+static void vma_print_allocator(struct i915_vma *vma, const char *reason)
+{
+	char buf[512];
+
+	if (!vma->node.stack) {
+		DRM_DEBUG_DRIVER("vma.node [%08llx + %08llx] %s: unknown owner\n",
+				 vma->node.start, vma->node.size, reason);
+		return;
+	}
+
+	stack_depot_snprint(vma->node.stack, buf, sizeof(buf), 0);
+	DRM_DEBUG_DRIVER("vma.node [%08llx + %08llx] %s: inserted at %s\n",
+			 vma->node.start, vma->node.size, reason, buf);
+}
+
+#else
+
+static void vma_print_allocator(struct i915_vma *vma, const char *reason)
+{
+}
+
+#endif
+
+static inline struct i915_vma *active_to_vma(struct i915_active *ref)
+{
+	return container_of(ref, typeof(struct i915_vma), active);
+}
+
+static int __i915_vma_active(struct i915_active *ref)
+{
+	return i915_vma_tryget(active_to_vma(ref)) ? 0 : -ENOENT;
+}
+
+static void __i915_vma_retire(struct i915_active *ref)
+{
+	i915_vma_put(active_to_vma(ref));
+}
+
+static struct i915_vma *
+vma_create(struct drm_i915_gem_object *obj,
+	   struct i915_address_space *vm,
+	   const struct i915_gtt_view *view)
+{
+	struct i915_vma *pos = ERR_PTR(-E2BIG);
+	struct i915_vma *vma;
+	struct rb_node *rb, **p;
+	int err;
+
+	/* The aliasing_ppgtt should never be used directly! */
+	GEM_BUG_ON(vm == &vm->gt->ggtt->alias->vm);
+
+	vma = i915_vma_alloc();
+	if (vma == NULL)
+		return ERR_PTR(-ENOMEM);
+
+	vma->ops = &vm->vma_ops;
+	vma->obj = obj;
+	vma->size = obj->base.size;
+	vma->display_alignment = I915_GTT_MIN_ALIGNMENT;
+
+	i915_active_init(&vma->active, __i915_vma_active, __i915_vma_retire, 0);
+
+	/* Declare ourselves safe for use inside shrinkers */
+	if (IS_ENABLED(CONFIG_LOCKDEP)) {
+		fs_reclaim_acquire(GFP_KERNEL);
+		might_lock(&vma->active.mutex);
+		fs_reclaim_release(GFP_KERNEL);
+	}
+
+	INIT_LIST_HEAD(&vma->closed_link);
+	INIT_LIST_HEAD(&vma->obj_link);
+	RB_CLEAR_NODE(&vma->obj_node);
+
+	if (view && view->type != I915_GTT_VIEW_NORMAL) {
+		vma->gtt_view = *view;
+		if (view->type == I915_GTT_VIEW_PARTIAL) {
+			GEM_BUG_ON(range_overflows_t(u64,
+						     view->partial.offset,
+						     view->partial.size,
+						     obj->base.size >> PAGE_SHIFT));
+			vma->size = view->partial.size;
+			vma->size <<= PAGE_SHIFT;
+			GEM_BUG_ON(vma->size > obj->base.size);
+		} else if (view->type == I915_GTT_VIEW_ROTATED) {
+			vma->size = intel_rotation_info_size(&view->rotated);
+			vma->size <<= PAGE_SHIFT;
+		} else if (view->type == I915_GTT_VIEW_REMAPPED) {
+			vma->size = intel_remapped_info_size(&view->remapped);
+			vma->size <<= PAGE_SHIFT;
+		}
+	}
+
+	if (unlikely(vma->size > vm->total))
+		goto err_vma;
+
+	GEM_BUG_ON(!IS_ALIGNED(vma->size, I915_GTT_PAGE_SIZE));
+
+	err = mutex_lock_interruptible(&vm->mutex);
+	if (err) {
+		pos = ERR_PTR(err);
+		goto err_vma;
+	}
+
+	vma->vm = vm;
+	list_add_tail(&vma->vm_link, &vm->unbound_list);
+
+	spin_lock(&obj->vma.lock);
+	if (i915_is_ggtt(vm)) {
+		if (unlikely(overflows_type(vma->size, u32)))
+			goto err_unlock;
+
+		vma->fence_size = i915_gem_fence_size(vm->i915, vma->size,
+						      i915_gem_object_get_tiling(obj),
+						      i915_gem_object_get_stride(obj));
+		if (unlikely(vma->fence_size < vma->size || /* overflow */
+			     vma->fence_size > vm->total))
+			goto err_unlock;
+
+		GEM_BUG_ON(!IS_ALIGNED(vma->fence_size, I915_GTT_MIN_ALIGNMENT));
+
+		vma->fence_alignment = i915_gem_fence_alignment(vm->i915, vma->size,
+								i915_gem_object_get_tiling(obj),
+								i915_gem_object_get_stride(obj));
+		GEM_BUG_ON(!is_power_of_2(vma->fence_alignment));
+
+		__set_bit(I915_VMA_GGTT_BIT, __i915_vma_flags(vma));
+	}
+
+	rb = NULL;
+	p = &obj->vma.tree.rb_node;
+	while (*p) {
+		long cmp;
+
+		rb = *p;
+		pos = rb_entry(rb, struct i915_vma, obj_node);
+
+		/*
+		 * If the view already exists in the tree, another thread
+		 * already created a matching vma, so return the older instance
+		 * and dispose of ours.
+		 */
+		cmp = i915_vma_compare(pos, vm, view);
+		if (cmp < 0)
+			p = &rb->rb_right;
+		else if (cmp > 0)
+			p = &rb->rb_left;
+		else
+			goto err_unlock;
+	}
+	rb_link_node(&vma->obj_node, rb, p);
+	rb_insert_color(&vma->obj_node, &obj->vma.tree);
+
+	if (i915_vma_is_ggtt(vma))
+		/*
+		 * We put the GGTT vma at the start of the vma-list, followed
+		 * by the ppGGTT vma. This allows us to break early when
+		 * iterating over only the GGTT vma for an object, see
+		 * for_each_ggtt_vma()
+		 */
+		list_add(&vma->obj_link, &obj->vma.list);
+	else
+		list_add_tail(&vma->obj_link, &obj->vma.list);
+
+	spin_unlock(&obj->vma.lock);
+	mutex_unlock(&vm->mutex);
+
+	return vma;
+
+err_unlock:
+	spin_unlock(&obj->vma.lock);
+	list_del_init(&vma->vm_link);
+	mutex_unlock(&vm->mutex);
+err_vma:
+	i915_vma_free(vma);
+	return pos;
+}
+
+static struct i915_vma *
+i915_vma_lookup(struct drm_i915_gem_object *obj,
+	   struct i915_address_space *vm,
+	   const struct i915_gtt_view *view)
+{
+	struct rb_node *rb;
+
+	rb = obj->vma.tree.rb_node;
+	while (rb) {
+		struct i915_vma *vma = rb_entry(rb, struct i915_vma, obj_node);
+		long cmp;
+
+		cmp = i915_vma_compare(vma, vm, view);
+		if (cmp == 0)
+			return vma;
+
+		if (cmp < 0)
+			rb = rb->rb_right;
+		else
+			rb = rb->rb_left;
+	}
+
+	return NULL;
+}
+
+/**
+ * i915_vma_instance - return the singleton instance of the VMA
+ * @obj: parent &struct drm_i915_gem_object to be mapped
+ * @vm: address space in which the mapping is located
+ * @view: additional mapping requirements
+ *
+ * i915_vma_instance() looks up an existing VMA of the @obj in the @vm with
+ * the same @view characteristics. If a match is not found, one is created.
+ * Once created, the VMA is kept until either the object is freed, or the
+ * address space is closed.
+ *
+ * Returns the vma, or an error pointer.
+ */
+struct i915_vma *
+i915_vma_instance(struct drm_i915_gem_object *obj,
+		  struct i915_address_space *vm,
+		  const struct i915_gtt_view *view)
+{
+	struct i915_vma *vma;
+
+	GEM_BUG_ON(view && !i915_is_ggtt_or_dpt(vm));
+	GEM_BUG_ON(!kref_read(&vm->ref));
+
+	spin_lock(&obj->vma.lock);
+	vma = i915_vma_lookup(obj, vm, view);
+	spin_unlock(&obj->vma.lock);
+
+	/* vma_create() will resolve the race if another creates the vma */
+	if (unlikely(!vma))
+		vma = vma_create(obj, vm, view);
+
+	GEM_BUG_ON(!IS_ERR(vma) && i915_vma_compare(vma, vm, view));
+	return vma;
+}
+
+struct i915_vma_work {
+	struct dma_fence_work base;
+	struct i915_address_space *vm;
+	struct i915_vm_pt_stash stash;
+	struct i915_vma_resource *vma_res;
+	struct drm_i915_gem_object *obj;
+	struct i915_sw_dma_fence_cb cb;
+	enum i915_cache_level cache_level;
+	unsigned int flags;
+};
+
+static void __vma_bind(struct dma_fence_work *work)
+{
+	struct i915_vma_work *vw = container_of(work, typeof(*vw), base);
+	struct i915_vma_resource *vma_res = vw->vma_res;
+
+	/*
+	 * We are about the bind the object, which must mean we have already
+	 * signaled the work to potentially clear/move the pages underneath. If
+	 * something went wrong at that stage then the object should have
+	 * unknown_state set, in which case we need to skip the bind.
+	 */
+	if (i915_gem_object_has_unknown_state(vw->obj))
+		return;
+
+	vma_res->ops->bind_vma(vma_res->vm, &vw->stash,
+			       vma_res, vw->cache_level, vw->flags);
+}
+
+static void __vma_release(struct dma_fence_work *work)
+{
+	struct i915_vma_work *vw = container_of(work, typeof(*vw), base);
+
+	if (vw->obj)
+		i915_gem_object_put(vw->obj);
+
+	i915_vm_free_pt_stash(vw->vm, &vw->stash);
+	if (vw->vma_res)
+		i915_vma_resource_put(vw->vma_res);
+}
+
+static const struct dma_fence_work_ops bind_ops = {
+	.name = "bind",
+	.work = __vma_bind,
+	.release = __vma_release,
+};
+
+struct i915_vma_work *i915_vma_work(void)
+{
+	struct i915_vma_work *vw;
+
+	vw = kzalloc(sizeof(*vw), GFP_KERNEL);
+	if (!vw)
+		return NULL;
+
+	dma_fence_work_init(&vw->base, &bind_ops);
+	vw->base.dma.error = -EAGAIN; /* disable the worker by default */
+
+	return vw;
+}
+
+int i915_vma_wait_for_bind(struct i915_vma *vma)
+{
+	int err = 0;
+
+	if (rcu_access_pointer(vma->active.excl.fence)) {
+		struct dma_fence *fence;
+
+		rcu_read_lock();
+		fence = dma_fence_get_rcu_safe(&vma->active.excl.fence);
+		rcu_read_unlock();
+		if (fence) {
+			err = dma_fence_wait(fence, true);
+			dma_fence_put(fence);
+		}
+	}
+
+	return err;
+}
+
+#if IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM)
+static int i915_vma_verify_bind_complete(struct i915_vma *vma)
+{
+	struct dma_fence *fence = i915_active_fence_get(&vma->active.excl);
+	int err;
+
+	if (!fence)
+		return 0;
+
+	if (dma_fence_is_signaled(fence))
+		err = fence->error;
+	else
+		err = -EBUSY;
+
+	dma_fence_put(fence);
+
+	return err;
+}
+#else
+#define i915_vma_verify_bind_complete(_vma) 0
+#endif
+
+I915_SELFTEST_EXPORT void
+i915_vma_resource_init_from_vma(struct i915_vma_resource *vma_res,
+				struct i915_vma *vma)
+{
+	struct drm_i915_gem_object *obj = vma->obj;
+
+	i915_vma_resource_init(vma_res, vma->vm, vma->pages, &vma->page_sizes,
+			       obj->mm.rsgt, i915_gem_object_is_readonly(obj),
+			       i915_gem_object_is_lmem(obj), obj->mm.region,
+			       vma->ops, vma->private, vma->node.start,
+			       vma->node.size, vma->size);
+}
+
+/**
+ * i915_vma_bind - Sets up PTEs for an VMA in it's corresponding address space.
+ * @vma: VMA to map
+ * @cache_level: mapping cache level
+ * @flags: flags like global or local mapping
+ * @work: preallocated worker for allocating and binding the PTE
+ * @vma_res: pointer to a preallocated vma resource. The resource is either
+ * consumed or freed.
+ *
+ * DMA addresses are taken from the scatter-gather table of this object (or of
+ * this VMA in case of non-default GGTT views) and PTE entries set up.
+ * Note that DMA addresses are also the only part of the SG table we care about.
+ */
+int i915_vma_bind(struct i915_vma *vma,
+		  enum i915_cache_level cache_level,
+		  u32 flags,
+		  struct i915_vma_work *work,
+		  struct i915_vma_resource *vma_res)
+{
+	u32 bind_flags;
+	u32 vma_flags;
+	int ret;
+
+	lockdep_assert_held(&vma->vm->mutex);
+	GEM_BUG_ON(!drm_mm_node_allocated(&vma->node));
+	GEM_BUG_ON(vma->size > vma->node.size);
+
+	if (GEM_DEBUG_WARN_ON(range_overflows(vma->node.start,
+					      vma->node.size,
+					      vma->vm->total))) {
+		i915_vma_resource_free(vma_res);
+		return -ENODEV;
+	}
+
+	if (GEM_DEBUG_WARN_ON(!flags)) {
+		i915_vma_resource_free(vma_res);
+		return -EINVAL;
+	}
+
+	bind_flags = flags;
+	bind_flags &= I915_VMA_GLOBAL_BIND | I915_VMA_LOCAL_BIND;
+
+	vma_flags = atomic_read(&vma->flags);
+	vma_flags &= I915_VMA_GLOBAL_BIND | I915_VMA_LOCAL_BIND;
+
+	bind_flags &= ~vma_flags;
+	if (bind_flags == 0) {
+		i915_vma_resource_free(vma_res);
+		return 0;
+	}
+
+	GEM_BUG_ON(!atomic_read(&vma->pages_count));
+
+	/* Wait for or await async unbinds touching our range */
+	if (work && bind_flags & vma->vm->bind_async_flags)
+		ret = i915_vma_resource_bind_dep_await(vma->vm,
+						       &work->base.chain,
+						       vma->node.start,
+						       vma->node.size,
+						       true,
+						       GFP_NOWAIT |
+						       __GFP_RETRY_MAYFAIL |
+						       __GFP_NOWARN);
+	else
+		ret = i915_vma_resource_bind_dep_sync(vma->vm, vma->node.start,
+						      vma->node.size, true);
+	if (ret) {
+		i915_vma_resource_free(vma_res);
+		return ret;
+	}
+
+	if (vma->resource || !vma_res) {
+		/* Rebinding with an additional I915_VMA_*_BIND */
+		GEM_WARN_ON(!vma_flags);
+		i915_vma_resource_free(vma_res);
+	} else {
+		i915_vma_resource_init_from_vma(vma_res, vma);
+		vma->resource = vma_res;
+	}
+	trace_i915_vma_bind(vma, bind_flags);
+	if (work && bind_flags & vma->vm->bind_async_flags) {
+		struct dma_fence *prev;
+
+		work->vma_res = i915_vma_resource_get(vma->resource);
+		work->cache_level = cache_level;
+		work->flags = bind_flags;
+
+		/*
+		 * Note we only want to chain up to the migration fence on
+		 * the pages (not the object itself). As we don't track that,
+		 * yet, we have to use the exclusive fence instead.
+		 *
+		 * Also note that we do not want to track the async vma as
+		 * part of the obj->resv->excl_fence as it only affects
+		 * execution and not content or object's backing store lifetime.
+		 */
+		prev = i915_active_set_exclusive(&vma->active, &work->base.dma);
+		if (prev) {
+			__i915_sw_fence_await_dma_fence(&work->base.chain,
+							prev,
+							&work->cb);
+			dma_fence_put(prev);
+		}
+
+		work->base.dma.error = 0; /* enable the queue_work() */
+		work->obj = i915_gem_object_get(vma->obj);
+	} else {
+		ret = i915_gem_object_wait_moving_fence(vma->obj, true);
+		if (ret) {
+			i915_vma_resource_free(vma->resource);
+			vma->resource = NULL;
+
+			return ret;
+		}
+		vma->ops->bind_vma(vma->vm, NULL, vma->resource, cache_level,
+				   bind_flags);
+	}
+
+	atomic_or(bind_flags, &vma->flags);
+	return 0;
+}
+
+void __iomem *i915_vma_pin_iomap(struct i915_vma *vma)
+{
+	void __iomem *ptr;
+	int err;
+
+	if (WARN_ON_ONCE(vma->obj->flags & I915_BO_ALLOC_GPU_ONLY))
+		return IOMEM_ERR_PTR(-EINVAL);
+
+	GEM_BUG_ON(!i915_vma_is_ggtt(vma));
+	GEM_BUG_ON(!i915_vma_is_bound(vma, I915_VMA_GLOBAL_BIND));
+	GEM_BUG_ON(i915_vma_verify_bind_complete(vma));
+
+	ptr = READ_ONCE(vma->iomap);
+	if (ptr == NULL) {
+		/*
+		 * TODO: consider just using i915_gem_object_pin_map() for lmem
+		 * instead, which already supports mapping non-contiguous chunks
+		 * of pages, that way we can also drop the
+		 * I915_BO_ALLOC_CONTIGUOUS when allocating the object.
+		 */
+		if (i915_gem_object_is_lmem(vma->obj)) {
+			ptr = i915_gem_object_lmem_io_map(vma->obj, 0,
+							  vma->obj->base.size);
+		} else if (i915_vma_is_map_and_fenceable(vma)) {
+			ptr = io_mapping_map_wc(&i915_vm_to_ggtt(vma->vm)->iomap,
+						vma->node.start,
+						vma->node.size);
+		} else {
+			ptr = (void __iomem *)
+				i915_gem_object_pin_map(vma->obj, I915_MAP_WC);
+			if (IS_ERR(ptr)) {
+				err = PTR_ERR(ptr);
+				goto err;
+			}
+			ptr = page_pack_bits(ptr, 1);
+		}
+
+		if (ptr == NULL) {
+			err = -ENOMEM;
+			goto err;
+		}
+
+		if (unlikely(cmpxchg(&vma->iomap, NULL, ptr))) {
+			if (page_unmask_bits(ptr))
+				__i915_gem_object_release_map(vma->obj);
+			else
+				io_mapping_unmap(ptr);
+			ptr = vma->iomap;
+		}
+	}
+
+	__i915_vma_pin(vma);
+
+	err = i915_vma_pin_fence(vma);
+	if (err)
+		goto err_unpin;
+
+	i915_vma_set_ggtt_write(vma);
+
+	/* NB Access through the GTT requires the device to be awake. */
+	return page_mask_bits(ptr);
+
+err_unpin:
+	__i915_vma_unpin(vma);
+err:
+	return IOMEM_ERR_PTR(err);
+}
+
+void i915_vma_flush_writes(struct i915_vma *vma)
+{
+	if (i915_vma_unset_ggtt_write(vma))
+		intel_gt_flush_ggtt_writes(vma->vm->gt);
+}
+
+void i915_vma_unpin_iomap(struct i915_vma *vma)
+{
+	GEM_BUG_ON(vma->iomap == NULL);
+
+	/* XXX We keep the mapping until __i915_vma_unbind()/evict() */
+
+	i915_vma_flush_writes(vma);
+
+	i915_vma_unpin_fence(vma);
+	i915_vma_unpin(vma);
+}
+
+void i915_vma_unpin_and_release(struct i915_vma **p_vma, unsigned int flags)
+{
+	struct i915_vma *vma;
+	struct drm_i915_gem_object *obj;
+
+	vma = fetch_and_zero(p_vma);
+	if (!vma)
+		return;
+
+	obj = vma->obj;
+	GEM_BUG_ON(!obj);
+
+	i915_vma_unpin(vma);
+
+	if (flags & I915_VMA_RELEASE_MAP)
+		i915_gem_object_unpin_map(obj);
+
+	i915_gem_object_put(obj);
+}
+
+bool i915_vma_misplaced(const struct i915_vma *vma,
+			u64 size, u64 alignment, u64 flags)
+{
+	if (!drm_mm_node_allocated(&vma->node))
+		return false;
+
+	if (test_bit(I915_VMA_ERROR_BIT, __i915_vma_flags(vma)))
+		return true;
+
+	if (vma->node.size < size)
+		return true;
+
+	GEM_BUG_ON(alignment && !is_power_of_2(alignment));
+	if (alignment && !IS_ALIGNED(vma->node.start, alignment))
+		return true;
+
+	if (flags & PIN_MAPPABLE && !i915_vma_is_map_and_fenceable(vma))
+		return true;
+
+	if (flags & PIN_OFFSET_BIAS &&
+	    vma->node.start < (flags & PIN_OFFSET_MASK))
+		return true;
+
+	if (flags & PIN_OFFSET_FIXED &&
+	    vma->node.start != (flags & PIN_OFFSET_MASK))
+		return true;
+
+	return false;
+}
+
+void __i915_vma_set_map_and_fenceable(struct i915_vma *vma)
+{
+	bool mappable, fenceable;
+
+	GEM_BUG_ON(!i915_vma_is_ggtt(vma));
+	GEM_BUG_ON(!vma->fence_size);
+
+	fenceable = (vma->node.size >= vma->fence_size &&
+		     IS_ALIGNED(vma->node.start, vma->fence_alignment));
+
+	mappable = vma->node.start + vma->fence_size <= i915_vm_to_ggtt(vma->vm)->mappable_end;
+
+	if (mappable && fenceable)
+		set_bit(I915_VMA_CAN_FENCE_BIT, __i915_vma_flags(vma));
+	else
+		clear_bit(I915_VMA_CAN_FENCE_BIT, __i915_vma_flags(vma));
+}
+
+bool i915_gem_valid_gtt_space(struct i915_vma *vma, unsigned long color)
+{
+	struct drm_mm_node *node = &vma->node;
+	struct drm_mm_node *other;
+
+	/*
+	 * On some machines we have to be careful when putting differing types
+	 * of snoopable memory together to avoid the prefetcher crossing memory
+	 * domains and dying. During vm initialisation, we decide whether or not
+	 * these constraints apply and set the drm_mm.color_adjust
+	 * appropriately.
+	 */
+	if (!i915_vm_has_cache_coloring(vma->vm))
+		return true;
+
+	/* Only valid to be called on an already inserted vma */
+	GEM_BUG_ON(!drm_mm_node_allocated(node));
+	GEM_BUG_ON(list_empty(&node->node_list));
+
+	other = list_prev_entry(node, node_list);
+	if (i915_node_color_differs(other, color) &&
+	    !drm_mm_hole_follows(other))
+		return false;
+
+	other = list_next_entry(node, node_list);
+	if (i915_node_color_differs(other, color) &&
+	    !drm_mm_hole_follows(node))
+		return false;
+
+	return true;
+}
+
+/**
+ * i915_vma_insert - finds a slot for the vma in its address space
+ * @vma: the vma
+ * @size: requested size in bytes (can be larger than the VMA)
+ * @alignment: required alignment
+ * @flags: mask of PIN_* flags to use
+ *
+ * First we try to allocate some free space that meets the requirements for
+ * the VMA. Failiing that, if the flags permit, it will evict an old VMA,
+ * preferrably the oldest idle entry to make room for the new VMA.
+ *
+ * Returns:
+ * 0 on success, negative error code otherwise.
+ */
+static int
+i915_vma_insert(struct i915_vma *vma, struct i915_gem_ww_ctx *ww,
+		u64 size, u64 alignment, u64 flags)
+{
+	unsigned long color;
+	u64 start, end;
+	int ret;
+
+	GEM_BUG_ON(i915_vma_is_bound(vma, I915_VMA_GLOBAL_BIND | I915_VMA_LOCAL_BIND));
+	GEM_BUG_ON(drm_mm_node_allocated(&vma->node));
+
+	size = max(size, vma->size);
+	alignment = max(alignment, vma->display_alignment);
+	if (flags & PIN_MAPPABLE) {
+		size = max_t(typeof(size), size, vma->fence_size);
+		alignment = max_t(typeof(alignment),
+				  alignment, vma->fence_alignment);
+	}
+
+	GEM_BUG_ON(!IS_ALIGNED(size, I915_GTT_PAGE_SIZE));
+	GEM_BUG_ON(!IS_ALIGNED(alignment, I915_GTT_MIN_ALIGNMENT));
+	GEM_BUG_ON(!is_power_of_2(alignment));
+
+	start = flags & PIN_OFFSET_BIAS ? flags & PIN_OFFSET_MASK : 0;
+	GEM_BUG_ON(!IS_ALIGNED(start, I915_GTT_PAGE_SIZE));
+
+	end = vma->vm->total;
+	if (flags & PIN_MAPPABLE)
+		end = min_t(u64, end, i915_vm_to_ggtt(vma->vm)->mappable_end);
+	if (flags & PIN_ZONE_4G)
+		end = min_t(u64, end, (1ULL << 32) - I915_GTT_PAGE_SIZE);
+	GEM_BUG_ON(!IS_ALIGNED(end, I915_GTT_PAGE_SIZE));
+
+	alignment = max(alignment, i915_vm_obj_min_alignment(vma->vm, vma->obj));
+	/*
+	 * for compact-pt we round up the reservation to prevent
+	 * any smaller pages being used within the same PDE
+	 */
+	if (NEEDS_COMPACT_PT(vma->vm->i915))
+		size = round_up(size, alignment);
+
+	/* If binding the object/GGTT view requires more space than the entire
+	 * aperture has, reject it early before evicting everything in a vain
+	 * attempt to find space.
+	 */
+	if (size > end) {
+		DRM_DEBUG("Attempting to bind an object larger than the aperture: request=%llu > %s aperture=%llu\n",
+			  size, flags & PIN_MAPPABLE ? "mappable" : "total",
+			  end);
+		return -ENOSPC;
+	}
+
+	color = 0;
+
+	if (i915_vm_has_cache_coloring(vma->vm))
+		color = vma->obj->cache_level;
+
+	if (flags & PIN_OFFSET_FIXED) {
+		u64 offset = flags & PIN_OFFSET_MASK;
+		if (!IS_ALIGNED(offset, alignment) ||
+		    range_overflows(offset, size, end))
+			return -EINVAL;
+
+		ret = i915_gem_gtt_reserve(vma->vm, ww, &vma->node,
+					   size, offset, color,
+					   flags);
+		if (ret)
+			return ret;
+	} else {
+		/*
+		 * We only support huge gtt pages through the 48b PPGTT,
+		 * however we also don't want to force any alignment for
+		 * objects which need to be tightly packed into the low 32bits.
+		 *
+		 * Note that we assume that GGTT are limited to 4GiB for the
+		 * forseeable future. See also i915_ggtt_offset().
+		 */
+		if (upper_32_bits(end - 1) &&
+		    vma->page_sizes.sg > I915_GTT_PAGE_SIZE) {
+			/*
+			 * We can't mix 64K and 4K PTEs in the same page-table
+			 * (2M block), and so to avoid the ugliness and
+			 * complexity of coloring we opt for just aligning 64K
+			 * objects to 2M.
+			 */
+			u64 page_alignment =
+				rounddown_pow_of_two(vma->page_sizes.sg |
+						     I915_GTT_PAGE_SIZE_2M);
+
+			/*
+			 * Check we don't expand for the limited Global GTT
+			 * (mappable aperture is even more precious!). This
+			 * also checks that we exclude the aliasing-ppgtt.
+			 */
+			GEM_BUG_ON(i915_vma_is_ggtt(vma));
+
+			alignment = max(alignment, page_alignment);
+
+			if (vma->page_sizes.sg & I915_GTT_PAGE_SIZE_64K)
+				size = round_up(size, I915_GTT_PAGE_SIZE_2M);
+		}
+
+		ret = i915_gem_gtt_insert(vma->vm, ww, &vma->node,
+					  size, alignment, color,
+					  start, end, flags);
+		if (ret)
+			return ret;
+
+		GEM_BUG_ON(vma->node.start < start);
+		GEM_BUG_ON(vma->node.start + vma->node.size > end);
+	}
+	GEM_BUG_ON(!drm_mm_node_allocated(&vma->node));
+	GEM_BUG_ON(!i915_gem_valid_gtt_space(vma, color));
+
+	list_move_tail(&vma->vm_link, &vma->vm->bound_list);
+
+	return 0;
+}
+
+static void
+i915_vma_detach(struct i915_vma *vma)
+{
+	GEM_BUG_ON(!drm_mm_node_allocated(&vma->node));
+	GEM_BUG_ON(i915_vma_is_bound(vma, I915_VMA_GLOBAL_BIND | I915_VMA_LOCAL_BIND));
+
+	/*
+	 * And finally now the object is completely decoupled from this
+	 * vma, we can drop its hold on the backing storage and allow
+	 * it to be reaped by the shrinker.
+	 */
+	list_move_tail(&vma->vm_link, &vma->vm->unbound_list);
+}
+
+static bool try_qad_pin(struct i915_vma *vma, unsigned int flags)
+{
+	unsigned int bound;
+
+	bound = atomic_read(&vma->flags);
+
+	if (flags & PIN_VALIDATE) {
+		flags &= I915_VMA_BIND_MASK;
+
+		return (flags & bound) == flags;
+	}
+
+	/* with the lock mandatory for unbind, we don't race here */
+	flags &= I915_VMA_BIND_MASK;
+	do {
+		if (unlikely(flags & ~bound))
+			return false;
+
+		if (unlikely(bound & (I915_VMA_OVERFLOW | I915_VMA_ERROR)))
+			return false;
+
+		GEM_BUG_ON(((bound + 1) & I915_VMA_PIN_MASK) == 0);
+	} while (!atomic_try_cmpxchg(&vma->flags, &bound, bound + 1));
+
+	return true;
+}
+
+static struct scatterlist *
+rotate_pages(struct drm_i915_gem_object *obj, unsigned int offset,
+	     unsigned int width, unsigned int height,
+	     unsigned int src_stride, unsigned int dst_stride,
+	     struct sg_table *st, struct scatterlist *sg)
+{
+	unsigned int column, row;
+	unsigned int src_idx;
+
+	for (column = 0; column < width; column++) {
+		unsigned int left;
+
+		src_idx = src_stride * (height - 1) + column + offset;
+		for (row = 0; row < height; row++) {
+			st->nents++;
+			/*
+			 * We don't need the pages, but need to initialize
+			 * the entries so the sg list can be happily traversed.
+			 * The only thing we need are DMA addresses.
+			 */
+			sg_set_page(sg, NULL, I915_GTT_PAGE_SIZE, 0);
+			sg_dma_address(sg) =
+				i915_gem_object_get_dma_address(obj, src_idx);
+			sg_dma_len(sg) = I915_GTT_PAGE_SIZE;
+			sg = sg_next(sg);
+			src_idx -= src_stride;
+		}
+
+		left = (dst_stride - height) * I915_GTT_PAGE_SIZE;
+
+		if (!left)
+			continue;
+
+		st->nents++;
+
+		/*
+		 * The DE ignores the PTEs for the padding tiles, the sg entry
+		 * here is just a conenience to indicate how many padding PTEs
+		 * to insert at this spot.
+		 */
+		sg_set_page(sg, NULL, left, 0);
+		sg_dma_address(sg) = 0;
+		sg_dma_len(sg) = left;
+		sg = sg_next(sg);
+	}
+
+	return sg;
+}
+
+static noinline struct sg_table *
+intel_rotate_pages(struct intel_rotation_info *rot_info,
+		   struct drm_i915_gem_object *obj)
+{
+	unsigned int size = intel_rotation_info_size(rot_info);
+	struct drm_i915_private *i915 = to_i915(obj->base.dev);
+	struct sg_table *st;
+	struct scatterlist *sg;
+	int ret = -ENOMEM;
+	int i;
+
+	/* Allocate target SG list. */
+	st = kmalloc(sizeof(*st), GFP_KERNEL);
+	if (!st)
+		goto err_st_alloc;
+
+	ret = sg_alloc_table(st, size, GFP_KERNEL);
+	if (ret)
+		goto err_sg_alloc;
+
+	st->nents = 0;
+	sg = st->sgl;
+
+	for (i = 0 ; i < ARRAY_SIZE(rot_info->plane); i++)
+		sg = rotate_pages(obj, rot_info->plane[i].offset,
+				  rot_info->plane[i].width, rot_info->plane[i].height,
+				  rot_info->plane[i].src_stride,
+				  rot_info->plane[i].dst_stride,
+				  st, sg);
+
+	return st;
+
+err_sg_alloc:
+	kfree(st);
+err_st_alloc:
+
+	drm_dbg(&i915->drm, "Failed to create rotated mapping for object size %zu! (%ux%u tiles, %u pages)\n",
+		obj->base.size, rot_info->plane[0].width,
+		rot_info->plane[0].height, size);
+
+	return ERR_PTR(ret);
+}
+
+static struct scatterlist *
+add_padding_pages(unsigned int count,
+		  struct sg_table *st, struct scatterlist *sg)
+{
+	st->nents++;
+
+	/*
+	 * The DE ignores the PTEs for the padding tiles, the sg entry
+	 * here is just a convenience to indicate how many padding PTEs
+	 * to insert at this spot.
+	 */
+	sg_set_page(sg, NULL, count * I915_GTT_PAGE_SIZE, 0);
+	sg_dma_address(sg) = 0;
+	sg_dma_len(sg) = count * I915_GTT_PAGE_SIZE;
+	sg = sg_next(sg);
+
+	return sg;
+}
+
+static struct scatterlist *
+remap_tiled_color_plane_pages(struct drm_i915_gem_object *obj,
+			      unsigned int offset, unsigned int alignment_pad,
+			      unsigned int width, unsigned int height,
+			      unsigned int src_stride, unsigned int dst_stride,
+			      struct sg_table *st, struct scatterlist *sg,
+			      unsigned int *gtt_offset)
+{
+	unsigned int row;
+
+	if (!width || !height)
+		return sg;
+
+	if (alignment_pad)
+		sg = add_padding_pages(alignment_pad, st, sg);
+
+	for (row = 0; row < height; row++) {
+		unsigned int left = width * I915_GTT_PAGE_SIZE;
+
+		while (left) {
+			dma_addr_t addr;
+			unsigned int length;
+
+			/*
+			 * We don't need the pages, but need to initialize
+			 * the entries so the sg list can be happily traversed.
+			 * The only thing we need are DMA addresses.
+			 */
+
+			addr = i915_gem_object_get_dma_address_len(obj, offset, &length);
+
+			length = min(left, length);
+
+			st->nents++;
+
+			sg_set_page(sg, NULL, length, 0);
+			sg_dma_address(sg) = addr;
+			sg_dma_len(sg) = length;
+			sg = sg_next(sg);
+
+			offset += length / I915_GTT_PAGE_SIZE;
+			left -= length;
+		}
+
+		offset += src_stride - width;
+
+		left = (dst_stride - width) * I915_GTT_PAGE_SIZE;
+
+		if (!left)
+			continue;
+
+		sg = add_padding_pages(left >> PAGE_SHIFT, st, sg);
+	}
+
+	*gtt_offset += alignment_pad + dst_stride * height;
+
+	return sg;
+}
+
+static struct scatterlist *
+remap_contiguous_pages(struct drm_i915_gem_object *obj,
+		       unsigned int obj_offset,
+		       unsigned int count,
+		       struct sg_table *st, struct scatterlist *sg)
+{
+	struct scatterlist *iter;
+	unsigned int offset;
+
+	iter = i915_gem_object_get_sg_dma(obj, obj_offset, &offset);
+	GEM_BUG_ON(!iter);
+
+	do {
+		unsigned int len;
+
+		len = min(sg_dma_len(iter) - (offset << PAGE_SHIFT),
+			  count << PAGE_SHIFT);
+		sg_set_page(sg, NULL, len, 0);
+		sg_dma_address(sg) =
+			sg_dma_address(iter) + (offset << PAGE_SHIFT);
+		sg_dma_len(sg) = len;
+
+		st->nents++;
+		count -= len >> PAGE_SHIFT;
+		if (count == 0)
+			return sg;
+
+		sg = __sg_next(sg);
+		iter = __sg_next(iter);
+		offset = 0;
+	} while (1);
+}
+
+static struct scatterlist *
+remap_linear_color_plane_pages(struct drm_i915_gem_object *obj,
+			       unsigned int obj_offset, unsigned int alignment_pad,
+			       unsigned int size,
+			       struct sg_table *st, struct scatterlist *sg,
+			       unsigned int *gtt_offset)
+{
+	if (!size)
+		return sg;
+
+	if (alignment_pad)
+		sg = add_padding_pages(alignment_pad, st, sg);
+
+	sg = remap_contiguous_pages(obj, obj_offset, size, st, sg);
+	sg = sg_next(sg);
+
+	*gtt_offset += alignment_pad + size;
+
+	return sg;
+}
+
+static struct scatterlist *
+remap_color_plane_pages(const struct intel_remapped_info *rem_info,
+			struct drm_i915_gem_object *obj,
+			int color_plane,
+			struct sg_table *st, struct scatterlist *sg,
+			unsigned int *gtt_offset)
+{
+	unsigned int alignment_pad = 0;
+
+	if (rem_info->plane_alignment)
+		alignment_pad = ALIGN(*gtt_offset, rem_info->plane_alignment) - *gtt_offset;
+
+	if (rem_info->plane[color_plane].linear)
+		sg = remap_linear_color_plane_pages(obj,
+						    rem_info->plane[color_plane].offset,
+						    alignment_pad,
+						    rem_info->plane[color_plane].size,
+						    st, sg,
+						    gtt_offset);
+
+	else
+		sg = remap_tiled_color_plane_pages(obj,
+						   rem_info->plane[color_plane].offset,
+						   alignment_pad,
+						   rem_info->plane[color_plane].width,
+						   rem_info->plane[color_plane].height,
+						   rem_info->plane[color_plane].src_stride,
+						   rem_info->plane[color_plane].dst_stride,
+						   st, sg,
+						   gtt_offset);
+
+	return sg;
+}
+
+static noinline struct sg_table *
+intel_remap_pages(struct intel_remapped_info *rem_info,
+		  struct drm_i915_gem_object *obj)
+{
+	unsigned int size = intel_remapped_info_size(rem_info);
+	struct drm_i915_private *i915 = to_i915(obj->base.dev);
+	struct sg_table *st;
+	struct scatterlist *sg;
+	unsigned int gtt_offset = 0;
+	int ret = -ENOMEM;
+	int i;
+
+	/* Allocate target SG list. */
+	st = kmalloc(sizeof(*st), GFP_KERNEL);
+	if (!st)
+		goto err_st_alloc;
+
+	ret = sg_alloc_table(st, size, GFP_KERNEL);
+	if (ret)
+		goto err_sg_alloc;
+
+	st->nents = 0;
+	sg = st->sgl;
+
+	for (i = 0 ; i < ARRAY_SIZE(rem_info->plane); i++)
+		sg = remap_color_plane_pages(rem_info, obj, i, st, sg, &gtt_offset);
+
+	i915_sg_trim(st);
+
+	return st;
+
+err_sg_alloc:
+	kfree(st);
+err_st_alloc:
+
+	drm_dbg(&i915->drm, "Failed to create remapped mapping for object size %zu! (%ux%u tiles, %u pages)\n",
+		obj->base.size, rem_info->plane[0].width,
+		rem_info->plane[0].height, size);
+
+	return ERR_PTR(ret);
+}
+
+static noinline struct sg_table *
+intel_partial_pages(const struct i915_gtt_view *view,
+		    struct drm_i915_gem_object *obj)
+{
+	struct sg_table *st;
+	struct scatterlist *sg;
+	unsigned int count = view->partial.size;
+	int ret = -ENOMEM;
+
+	st = kmalloc(sizeof(*st), GFP_KERNEL);
+	if (!st)
+		goto err_st_alloc;
+
+	ret = sg_alloc_table(st, count, GFP_KERNEL);
+	if (ret)
+		goto err_sg_alloc;
+
+	st->nents = 0;
+
+	sg = remap_contiguous_pages(obj, view->partial.offset, count, st, st->sgl);
+
+	sg_mark_end(sg);
+	i915_sg_trim(st); /* Drop any unused tail entries. */
+
+	return st;
+
+err_sg_alloc:
+	kfree(st);
+err_st_alloc:
+	return ERR_PTR(ret);
+}
+
+static int
+__i915_vma_get_pages(struct i915_vma *vma)
+{
+	struct sg_table *pages;
+
+	/*
+	 * The vma->pages are only valid within the lifespan of the borrowed
+	 * obj->mm.pages. When the obj->mm.pages sg_table is regenerated, so
+	 * must be the vma->pages. A simple rule is that vma->pages must only
+	 * be accessed when the obj->mm.pages are pinned.
+	 */
+	GEM_BUG_ON(!i915_gem_object_has_pinned_pages(vma->obj));
+
+	switch (vma->gtt_view.type) {
+	default:
+		GEM_BUG_ON(vma->gtt_view.type);
+		fallthrough;
+	case I915_GTT_VIEW_NORMAL:
+		pages = vma->obj->mm.pages;
+		break;
+
+	case I915_GTT_VIEW_ROTATED:
+		pages =
+			intel_rotate_pages(&vma->gtt_view.rotated, vma->obj);
+		break;
+
+	case I915_GTT_VIEW_REMAPPED:
+		pages =
+			intel_remap_pages(&vma->gtt_view.remapped, vma->obj);
+		break;
+
+	case I915_GTT_VIEW_PARTIAL:
+		pages = intel_partial_pages(&vma->gtt_view, vma->obj);
+		break;
+	}
+
+	if (IS_ERR(pages)) {
+		drm_err(&vma->vm->i915->drm,
+			"Failed to get pages for VMA view type %u (%ld)!\n",
+			vma->gtt_view.type, PTR_ERR(pages));
+		return PTR_ERR(pages);
+	}
+
+	vma->pages = pages;
+
+	return 0;
+}
+
+I915_SELFTEST_EXPORT int i915_vma_get_pages(struct i915_vma *vma)
+{
+	int err;
+
+	if (atomic_add_unless(&vma->pages_count, 1, 0))
+		return 0;
+
+	err = i915_gem_object_pin_pages(vma->obj);
+	if (err)
+		return err;
+
+	err = __i915_vma_get_pages(vma);
+	if (err)
+		goto err_unpin;
+
+	vma->page_sizes = vma->obj->mm.page_sizes;
+	atomic_inc(&vma->pages_count);
+
+	return 0;
+
+err_unpin:
+	__i915_gem_object_unpin_pages(vma->obj);
+
+	return err;
+}
+
+void vma_invalidate_tlb(struct i915_address_space *vm, u32 *tlb)
+{
+	/*
+	 * Before we release the pages that were bound by this vma, we
+	 * must invalidate all the TLBs that may still have a reference
+	 * back to our physical address. It only needs to be done once,
+	 * so after updating the PTE to point away from the pages, record
+	 * the most recent TLB invalidation seqno, and if we have not yet
+	 * flushed the TLBs upon release, perform a full invalidation.
+	 */
+	WRITE_ONCE(*tlb, intel_gt_next_invalidate_tlb_full(vm->gt));
+}
+
+static void __vma_put_pages(struct i915_vma *vma, unsigned int count)
+{
+	/* We allocate under vma_get_pages, so beware the shrinker */
+	GEM_BUG_ON(atomic_read(&vma->pages_count) < count);
+
+	if (atomic_sub_return(count, &vma->pages_count) == 0) {
+		if (vma->pages != vma->obj->mm.pages) {
+			sg_free_table(vma->pages);
+			kfree(vma->pages);
+		}
+		vma->pages = NULL;
+
+		i915_gem_object_unpin_pages(vma->obj);
+	}
+}
+
+I915_SELFTEST_EXPORT void i915_vma_put_pages(struct i915_vma *vma)
+{
+	if (atomic_add_unless(&vma->pages_count, -1, 1))
+		return;
+
+	__vma_put_pages(vma, 1);
+}
+
+static void vma_unbind_pages(struct i915_vma *vma)
+{
+	unsigned int count;
+
+	lockdep_assert_held(&vma->vm->mutex);
+
+	/* The upper portion of pages_count is the number of bindings */
+	count = atomic_read(&vma->pages_count);
+	count >>= I915_VMA_PAGES_BIAS;
+	GEM_BUG_ON(!count);
+
+	__vma_put_pages(vma, count | count << I915_VMA_PAGES_BIAS);
+}
+
+int i915_vma_pin_ww(struct i915_vma *vma, struct i915_gem_ww_ctx *ww,
+		    u64 size, u64 alignment, u64 flags)
+{
+	struct i915_vma_work *work = NULL;
+	struct dma_fence *moving = NULL;
+	struct i915_vma_resource *vma_res = NULL;
+	intel_wakeref_t wakeref = 0;
+	unsigned int bound;
+	int err;
+
+	assert_vma_held(vma);
+	GEM_BUG_ON(!ww);
+
+	BUILD_BUG_ON(PIN_GLOBAL != I915_VMA_GLOBAL_BIND);
+	BUILD_BUG_ON(PIN_USER != I915_VMA_LOCAL_BIND);
+
+	GEM_BUG_ON(!(flags & (PIN_USER | PIN_GLOBAL)));
+
+	/* First try and grab the pin without rebinding the vma */
+	if (try_qad_pin(vma, flags))
+		return 0;
+
+	err = i915_vma_get_pages(vma);
+	if (err)
+		return err;
+
+	if (flags & PIN_GLOBAL)
+		wakeref = intel_runtime_pm_get(&vma->vm->i915->runtime_pm);
+
+	if (flags & vma->vm->bind_async_flags) {
+		/* lock VM */
+		err = i915_vm_lock_objects(vma->vm, ww);
+		if (err)
+			goto err_rpm;
+
+		work = i915_vma_work();
+		if (!work) {
+			err = -ENOMEM;
+			goto err_rpm;
+		}
+
+		work->vm = vma->vm;
+
+		err = i915_gem_object_get_moving_fence(vma->obj, &moving);
+		if (err)
+			goto err_rpm;
+
+		dma_fence_work_chain(&work->base, moving);
+
+		/* Allocate enough page directories to used PTE */
+		if (vma->vm->allocate_va_range) {
+			err = i915_vm_alloc_pt_stash(vma->vm,
+						     &work->stash,
+						     vma->size);
+			if (err)
+				goto err_fence;
+
+			err = i915_vm_map_pt_stash(vma->vm, &work->stash);
+			if (err)
+				goto err_fence;
+		}
+	}
+
+	vma_res = i915_vma_resource_alloc();
+	if (IS_ERR(vma_res)) {
+		err = PTR_ERR(vma_res);
+		goto err_fence;
+	}
+
+	/*
+	 * Differentiate between user/kernel vma inside the aliasing-ppgtt.
+	 *
+	 * We conflate the Global GTT with the user's vma when using the
+	 * aliasing-ppgtt, but it is still vitally important to try and
+	 * keep the use cases distinct. For example, userptr objects are
+	 * not allowed inside the Global GTT as that will cause lock
+	 * inversions when we have to evict them the mmu_notifier callbacks -
+	 * but they are allowed to be part of the user ppGTT which can never
+	 * be mapped. As such we try to give the distinct users of the same
+	 * mutex, distinct lockclasses [equivalent to how we keep i915_ggtt
+	 * and i915_ppgtt separate].
+	 *
+	 * NB this may cause us to mask real lock inversions -- while the
+	 * code is safe today, lockdep may not be able to spot future
+	 * transgressions.
+	 */
+	err = mutex_lock_interruptible_nested(&vma->vm->mutex,
+					      !(flags & PIN_GLOBAL));
+	if (err)
+		goto err_vma_res;
+
+	/* No more allocations allowed now we hold vm->mutex */
+
+	if (unlikely(i915_vma_is_closed(vma))) {
+		err = -ENOENT;
+		goto err_unlock;
+	}
+
+	bound = atomic_read(&vma->flags);
+	if (unlikely(bound & I915_VMA_ERROR)) {
+		err = -ENOMEM;
+		goto err_unlock;
+	}
+
+	if (unlikely(!((bound + 1) & I915_VMA_PIN_MASK))) {
+		err = -EAGAIN; /* pins are meant to be fairly temporary */
+		goto err_unlock;
+	}
+
+	if (unlikely(!(flags & ~bound & I915_VMA_BIND_MASK))) {
+		if (!(flags & PIN_VALIDATE))
+			__i915_vma_pin(vma);
+		goto err_unlock;
+	}
+
+	err = i915_active_acquire(&vma->active);
+	if (err)
+		goto err_unlock;
+
+	if (!(bound & I915_VMA_BIND_MASK)) {
+		err = i915_vma_insert(vma, ww, size, alignment, flags);
+		if (err)
+			goto err_active;
+
+		if (i915_is_ggtt(vma->vm))
+			__i915_vma_set_map_and_fenceable(vma);
+	}
+
+	GEM_BUG_ON(!vma->pages);
+	err = i915_vma_bind(vma,
+			    vma->obj->cache_level,
+			    flags, work, vma_res);
+	vma_res = NULL;
+	if (err)
+		goto err_remove;
+
+	/* There should only be at most 2 active bindings (user, global) */
+	GEM_BUG_ON(bound + I915_VMA_PAGES_ACTIVE < bound);
+	atomic_add(I915_VMA_PAGES_ACTIVE, &vma->pages_count);
+	list_move_tail(&vma->vm_link, &vma->vm->bound_list);
+
+	if (!(flags & PIN_VALIDATE)) {
+		__i915_vma_pin(vma);
+		GEM_BUG_ON(!i915_vma_is_pinned(vma));
+	}
+	GEM_BUG_ON(!i915_vma_is_bound(vma, flags));
+	GEM_BUG_ON(i915_vma_misplaced(vma, size, alignment, flags));
+
+err_remove:
+	if (!i915_vma_is_bound(vma, I915_VMA_BIND_MASK)) {
+		i915_vma_detach(vma);
+		drm_mm_remove_node(&vma->node);
+	}
+err_active:
+	i915_active_release(&vma->active);
+err_unlock:
+	mutex_unlock(&vma->vm->mutex);
+err_vma_res:
+	i915_vma_resource_free(vma_res);
+err_fence:
+	if (work)
+		dma_fence_work_commit_imm(&work->base);
+err_rpm:
+	if (wakeref)
+		intel_runtime_pm_put(&vma->vm->i915->runtime_pm, wakeref);
+
+	if (moving)
+		dma_fence_put(moving);
+
+	i915_vma_put_pages(vma);
+	return err;
+}
+
+static void flush_idle_contexts(struct intel_gt *gt)
+{
+	struct intel_engine_cs *engine;
+	enum intel_engine_id id;
+
+	for_each_engine(engine, gt, id)
+		intel_engine_flush_barriers(engine);
+
+	intel_gt_wait_for_idle(gt, MAX_SCHEDULE_TIMEOUT);
+}
+
+static int __i915_ggtt_pin(struct i915_vma *vma, struct i915_gem_ww_ctx *ww,
+			   u32 align, unsigned int flags)
+{
+	struct i915_address_space *vm = vma->vm;
+	int err;
+
+	do {
+		err = i915_vma_pin_ww(vma, ww, 0, align, flags | PIN_GLOBAL);
+
+		if (err != -ENOSPC) {
+			if (!err) {
+				err = i915_vma_wait_for_bind(vma);
+				if (err)
+					i915_vma_unpin(vma);
+			}
+			return err;
+		}
+
+		/* Unlike i915_vma_pin, we don't take no for an answer! */
+		flush_idle_contexts(vm->gt);
+		if (mutex_lock_interruptible(&vm->mutex) == 0) {
+			/*
+			 * We pass NULL ww here, as we don't want to unbind
+			 * locked objects when called from execbuf when pinning
+			 * is removed. This would probably regress badly.
+			 */
+			i915_gem_evict_vm(vm, NULL, NULL);
+			mutex_unlock(&vm->mutex);
+		}
+	} while (1);
+}
+
+int i915_ggtt_pin(struct i915_vma *vma, struct i915_gem_ww_ctx *ww,
+		  u32 align, unsigned int flags)
+{
+	struct i915_gem_ww_ctx _ww;
+	int err;
+
+	GEM_BUG_ON(!i915_vma_is_ggtt(vma));
+
+	if (ww)
+		return __i915_ggtt_pin(vma, ww, align, flags);
+
+	lockdep_assert_not_held(&vma->obj->base.resv->lock.base);
+
+	for_i915_gem_ww(&_ww, err, true) {
+		err = i915_gem_object_lock(vma->obj, &_ww);
+		if (!err)
+			err = __i915_ggtt_pin(vma, &_ww, align, flags);
+	}
+
+	return err;
+}
+
+static void __vma_close(struct i915_vma *vma, struct intel_gt *gt)
+{
+	/*
+	 * We defer actually closing, unbinding and destroying the VMA until
+	 * the next idle point, or if the object is freed in the meantime. By
+	 * postponing the unbind, we allow for it to be resurrected by the
+	 * client, avoiding the work required to rebind the VMA. This is
+	 * advantageous for DRI, where the client/server pass objects
+	 * between themselves, temporarily opening a local VMA to the
+	 * object, and then closing it again. The same object is then reused
+	 * on the next frame (or two, depending on the depth of the swap queue)
+	 * causing us to rebind the VMA once more. This ends up being a lot
+	 * of wasted work for the steady state.
+	 */
+	GEM_BUG_ON(i915_vma_is_closed(vma));
+	list_add(&vma->closed_link, &gt->closed_vma);
+}
+
+void i915_vma_close(struct i915_vma *vma)
+{
+	struct intel_gt *gt = vma->vm->gt;
+	unsigned long flags;
+
+	if (i915_vma_is_ggtt(vma))
+		return;
+
+	GEM_BUG_ON(!atomic_read(&vma->open_count));
+	if (atomic_dec_and_lock_irqsave(&vma->open_count,
+					&gt->closed_lock,
+					flags)) {
+		__vma_close(vma, gt);
+		spin_unlock_irqrestore(&gt->closed_lock, flags);
+	}
+}
+
+static void __i915_vma_remove_closed(struct i915_vma *vma)
+{
+	list_del_init(&vma->closed_link);
+}
+
+void i915_vma_reopen(struct i915_vma *vma)
+{
+	struct intel_gt *gt = vma->vm->gt;
+
+	spin_lock_irq(&gt->closed_lock);
+	if (i915_vma_is_closed(vma))
+		__i915_vma_remove_closed(vma);
+	spin_unlock_irq(&gt->closed_lock);
+}
+
+static void force_unbind(struct i915_vma *vma)
+{
+	if (!drm_mm_node_allocated(&vma->node))
+		return;
+
+	atomic_and(~I915_VMA_PIN_MASK, &vma->flags);
+	WARN_ON(__i915_vma_unbind(vma));
+	GEM_BUG_ON(drm_mm_node_allocated(&vma->node));
+}
+
+static void release_references(struct i915_vma *vma, struct intel_gt *gt,
+			       bool vm_ddestroy)
+{
+	struct drm_i915_gem_object *obj = vma->obj;
+
+	GEM_BUG_ON(i915_vma_is_active(vma));
+
+	spin_lock(&obj->vma.lock);
+	list_del(&vma->obj_link);
+	if (!RB_EMPTY_NODE(&vma->obj_node))
+		rb_erase(&vma->obj_node, &obj->vma.tree);
+
+	spin_unlock(&obj->vma.lock);
+
+	spin_lock_irq(&gt->closed_lock);
+	__i915_vma_remove_closed(vma);
+	spin_unlock_irq(&gt->closed_lock);
+
+	if (vm_ddestroy)
+		i915_vm_resv_put(vma->vm);
+
+	i915_active_fini(&vma->active);
+	GEM_WARN_ON(vma->resource);
+	i915_vma_free(vma);
+}
+
+/**
+ * i915_vma_destroy_locked - Remove all weak reference to the vma and put
+ * the initial reference.
+ *
+ * This function should be called when it's decided the vma isn't needed
+ * anymore. The caller must assure that it doesn't race with another lookup
+ * plus destroy, typically by taking an appropriate reference.
+ *
+ * Current callsites are
+ * - __i915_gem_object_pages_fini()
+ * - __i915_vm_close() - Blocks the above function by taking a reference on
+ * the object.
+ * - __i915_vma_parked() - Blocks the above functions by taking a reference
+ * on the vm and a reference on the object. Also takes the object lock so
+ * destruction from __i915_vma_parked() can be blocked by holding the
+ * object lock. Since the object lock is only allowed from within i915 with
+ * an object refcount, holding the object lock also implicitly blocks the
+ * vma freeing from __i915_gem_object_pages_fini().
+ *
+ * Because of locks taken during destruction, a vma is also guaranteed to
+ * stay alive while the following locks are held if it was looked up while
+ * holding one of the locks:
+ * - vm->mutex
+ * - obj->vma.lock
+ * - gt->closed_lock
+ */
+void i915_vma_destroy_locked(struct i915_vma *vma)
+{
+	lockdep_assert_held(&vma->vm->mutex);
+
+	force_unbind(vma);
+	list_del_init(&vma->vm_link);
+	release_references(vma, vma->vm->gt, false);
+}
+
+void i915_vma_destroy(struct i915_vma *vma)
+{
+	struct intel_gt *gt;
+	bool vm_ddestroy;
+
+	mutex_lock(&vma->vm->mutex);
+	force_unbind(vma);
+	list_del_init(&vma->vm_link);
+	vm_ddestroy = vma->vm_ddestroy;
+	vma->vm_ddestroy = false;
+
+	/* vma->vm may be freed when releasing vma->vm->mutex. */
+	gt = vma->vm->gt;
+	mutex_unlock(&vma->vm->mutex);
+	release_references(vma, gt, vm_ddestroy);
+}
+
+void i915_vma_parked(struct intel_gt *gt)
+{
+	struct i915_vma *vma, *next;
+	LIST_HEAD(closed);
+
+	spin_lock_irq(&gt->closed_lock);
+	list_for_each_entry_safe(vma, next, &gt->closed_vma, closed_link) {
+		struct drm_i915_gem_object *obj = vma->obj;
+		struct i915_address_space *vm = vma->vm;
+
+		/* XXX All to avoid keeping a reference on i915_vma itself */
+
+		if (!kref_get_unless_zero(&obj->base.refcount))
+			continue;
+
+		if (!i915_vm_tryget(vm)) {
+			i915_gem_object_put(obj);
+			continue;
+		}
+
+		list_move(&vma->closed_link, &closed);
+	}
+	spin_unlock_irq(&gt->closed_lock);
+
+	/* As the GT is held idle, no vma can be reopened as we destroy them */
+	list_for_each_entry_safe(vma, next, &closed, closed_link) {
+		struct drm_i915_gem_object *obj = vma->obj;
+		struct i915_address_space *vm = vma->vm;
+
+		if (i915_gem_object_trylock(obj, NULL)) {
+			INIT_LIST_HEAD(&vma->closed_link);
+			i915_vma_destroy(vma);
+			i915_gem_object_unlock(obj);
+		} else {
+			/* back you go.. */
+			spin_lock_irq(&gt->closed_lock);
+			list_add(&vma->closed_link, &gt->closed_vma);
+			spin_unlock_irq(&gt->closed_lock);
+		}
+
+		i915_gem_object_put(obj);
+		i915_vm_put(vm);
+	}
+}
+
+static void __i915_vma_iounmap(struct i915_vma *vma)
+{
+	GEM_BUG_ON(i915_vma_is_pinned(vma));
+
+	if (vma->iomap == NULL)
+		return;
+
+	if (page_unmask_bits(vma->iomap))
+		__i915_gem_object_release_map(vma->obj);
+	else
+		io_mapping_unmap(vma->iomap);
+	vma->iomap = NULL;
+}
+
+void i915_vma_revoke_mmap(struct i915_vma *vma)
+{
+	struct drm_vma_offset_node *node;
+	u64 vma_offset;
+
+	if (!i915_vma_has_userfault(vma))
+		return;
+
+	GEM_BUG_ON(!i915_vma_is_map_and_fenceable(vma));
+	GEM_BUG_ON(!vma->obj->userfault_count);
+
+	node = &vma->mmo->vma_node;
+	vma_offset = vma->gtt_view.partial.offset << PAGE_SHIFT;
+	unmap_mapping_range(vma->vm->i915->drm.anon_inode->i_mapping,
+			    drm_vma_node_offset_addr(node) + vma_offset,
+			    vma->size,
+			    1);
+
+	i915_vma_unset_userfault(vma);
+	if (!--vma->obj->userfault_count)
+		list_del(&vma->obj->userfault_link);
+}
+
+static int
+__i915_request_await_bind(struct i915_request *rq, struct i915_vma *vma)
+{
+	return __i915_request_await_exclusive(rq, &vma->active);
+}
+
+static int __i915_vma_move_to_active(struct i915_vma *vma, struct i915_request *rq)
+{
+	int err;
+
+	/* Wait for the vma to be bound before we start! */
+	err = __i915_request_await_bind(rq, vma);
+	if (err)
+		return err;
+
+	return i915_active_add_request(&vma->active, rq);
+}
+
+int _i915_vma_move_to_active(struct i915_vma *vma,
+			     struct i915_request *rq,
+			     struct dma_fence *fence,
+			     unsigned int flags)
+{
+	struct drm_i915_gem_object *obj = vma->obj;
+	int err;
+
+	assert_object_held(obj);
+
+	GEM_BUG_ON(!vma->pages);
+
+	err = __i915_vma_move_to_active(vma, rq);
+	if (unlikely(err))
+		return err;
+
+	/*
+	 * Reserve fences slot early to prevent an allocation after preparing
+	 * the workload and associating fences with dma_resv.
+	 */
+	if (fence && !(flags & __EXEC_OBJECT_NO_RESERVE)) {
+		struct dma_fence *curr;
+		int idx;
+
+		dma_fence_array_for_each(curr, idx, fence)
+			;
+		err = dma_resv_reserve_fences(vma->obj->base.resv, idx);
+		if (unlikely(err))
+			return err;
+	}
+
+	if (flags & EXEC_OBJECT_WRITE) {
+		struct intel_frontbuffer *front;
+
+		front = __intel_frontbuffer_get(obj);
+		if (unlikely(front)) {
+			if (intel_frontbuffer_invalidate(front, ORIGIN_CS))
+				i915_active_add_request(&front->write, rq);
+			intel_frontbuffer_put(front);
+		}
+	}
+
+	if (fence) {
+		struct dma_fence *curr;
+		enum dma_resv_usage usage;
+		int idx;
+
+		if (flags & EXEC_OBJECT_WRITE) {
+			usage = DMA_RESV_USAGE_WRITE;
+			obj->write_domain = I915_GEM_DOMAIN_RENDER;
+			obj->read_domains = 0;
+		} else {
+			usage = DMA_RESV_USAGE_READ;
+			obj->write_domain = 0;
+		}
+
+		dma_fence_array_for_each(curr, idx, fence)
+			dma_resv_add_fence(vma->obj->base.resv, curr, usage);
+	}
+
+	if (flags & EXEC_OBJECT_NEEDS_FENCE && vma->fence)
+		i915_active_add_request(&vma->fence->active, rq);
+
+	obj->read_domains |= I915_GEM_GPU_DOMAINS;
+	obj->mm.dirty = true;
+
+	GEM_BUG_ON(!i915_vma_is_active(vma));
+	return 0;
+}
+
+struct dma_fence *__i915_vma_evict(struct i915_vma *vma, bool async)
+{
+	struct i915_vma_resource *vma_res = vma->resource;
+	struct dma_fence *unbind_fence;
+
+	GEM_BUG_ON(i915_vma_is_pinned(vma));
+	assert_vma_held_evict(vma);
+
+	if (i915_vma_is_map_and_fenceable(vma)) {
+		/* Force a pagefault for domain tracking on next user access */
+		i915_vma_revoke_mmap(vma);
+
+		/*
+		 * Check that we have flushed all writes through the GGTT
+		 * before the unbind, other due to non-strict nature of those
+		 * indirect writes they may end up referencing the GGTT PTE
+		 * after the unbind.
+		 *
+		 * Note that we may be concurrently poking at the GGTT_WRITE
+		 * bit from set-domain, as we mark all GGTT vma associated
+		 * with an object. We know this is for another vma, as we
+		 * are currently unbinding this one -- so if this vma will be
+		 * reused, it will be refaulted and have its dirty bit set
+		 * before the next write.
+		 */
+		i915_vma_flush_writes(vma);
+
+		/* release the fence reg _after_ flushing */
+		i915_vma_revoke_fence(vma);
+
+		clear_bit(I915_VMA_CAN_FENCE_BIT, __i915_vma_flags(vma));
+	}
+
+	__i915_vma_iounmap(vma);
+
+	GEM_BUG_ON(vma->fence);
+	GEM_BUG_ON(i915_vma_has_userfault(vma));
+
+	/* Object backend must be async capable. */
+	GEM_WARN_ON(async && !vma->resource->bi.pages_rsgt);
+
+	/* If vm is not open, unbind is a nop. */
+	vma_res->needs_wakeref = i915_vma_is_bound(vma, I915_VMA_GLOBAL_BIND) &&
+		kref_read(&vma->vm->ref);
+	vma_res->skip_pte_rewrite = !kref_read(&vma->vm->ref) ||
+		vma->vm->skip_pte_rewrite;
+	trace_i915_vma_unbind(vma);
+
+	if (async)
+		unbind_fence = i915_vma_resource_unbind(vma_res,
+							&vma->obj->mm.tlb);
+	else
+		unbind_fence = i915_vma_resource_unbind(vma_res, NULL);
+
+	vma->resource = NULL;
+
+	atomic_and(~(I915_VMA_BIND_MASK | I915_VMA_ERROR | I915_VMA_GGTT_WRITE),
+		   &vma->flags);
+
+	i915_vma_detach(vma);
+
+	if (!async) {
+		if (unbind_fence) {
+			dma_fence_wait(unbind_fence, false);
+			dma_fence_put(unbind_fence);
+			unbind_fence = NULL;
+		}
+		vma_invalidate_tlb(vma->vm, &vma->obj->mm.tlb);
+	}
+
+	/*
+	 * Binding itself may not have completed until the unbind fence signals,
+	 * so don't drop the pages until that happens, unless the resource is
+	 * async_capable.
+	 */
+
+	vma_unbind_pages(vma);
+	return unbind_fence;
+}
+
+int __i915_vma_unbind(struct i915_vma *vma)
+{
+	int ret;
+
+	lockdep_assert_held(&vma->vm->mutex);
+	assert_vma_held_evict(vma);
+
+	if (!drm_mm_node_allocated(&vma->node))
+		return 0;
+
+	if (i915_vma_is_pinned(vma)) {
+		vma_print_allocator(vma, "is pinned");
+		return -EAGAIN;
+	}
+
+	/*
+	 * After confirming that no one else is pinning this vma, wait for
+	 * any laggards who may have crept in during the wait (through
+	 * a residual pin skipping the vm->mutex) to complete.
+	 */
+	ret = i915_vma_sync(vma);
+	if (ret)
+		return ret;
+
+	GEM_BUG_ON(i915_vma_is_active(vma));
+	__i915_vma_evict(vma, false);
+
+	drm_mm_remove_node(&vma->node); /* pairs with i915_vma_release() */
+	return 0;
+}
+
+static struct dma_fence *__i915_vma_unbind_async(struct i915_vma *vma)
+{
+	struct dma_fence *fence;
+
+	lockdep_assert_held(&vma->vm->mutex);
+
+	if (!drm_mm_node_allocated(&vma->node))
+		return NULL;
+
+	if (i915_vma_is_pinned(vma) ||
+	    &vma->obj->mm.rsgt->table != vma->resource->bi.pages)
+		return ERR_PTR(-EAGAIN);
+
+	/*
+	 * We probably need to replace this with awaiting the fences of the
+	 * object's dma_resv when the vma active goes away. When doing that
+	 * we need to be careful to not add the vma_resource unbind fence
+	 * immediately to the object's dma_resv, because then unbinding
+	 * the next vma from the object, in case there are many, will
+	 * actually await the unbinding of the previous vmas, which is
+	 * undesirable.
+	 */
+	if (i915_sw_fence_await_active(&vma->resource->chain, &vma->active,
+				       I915_ACTIVE_AWAIT_EXCL |
+				       I915_ACTIVE_AWAIT_ACTIVE) < 0) {
+		return ERR_PTR(-EBUSY);
+	}
+
+	fence = __i915_vma_evict(vma, true);
+
+	drm_mm_remove_node(&vma->node); /* pairs with i915_vma_release() */
+
+	return fence;
+}
+
+int i915_vma_unbind(struct i915_vma *vma)
+{
+	struct i915_address_space *vm = vma->vm;
+	intel_wakeref_t wakeref = 0;
+	int err;
+
+	assert_object_held_shared(vma->obj);
+
+	/* Optimistic wait before taking the mutex */
+	err = i915_vma_sync(vma);
+	if (err)
+		return err;
+
+	if (!drm_mm_node_allocated(&vma->node))
+		return 0;
+
+	if (i915_vma_is_pinned(vma)) {
+		vma_print_allocator(vma, "is pinned");
+		return -EAGAIN;
+	}
+
+	if (i915_vma_is_bound(vma, I915_VMA_GLOBAL_BIND))
+		/* XXX not always required: nop_clear_range */
+		wakeref = intel_runtime_pm_get(&vm->i915->runtime_pm);
+
+	err = mutex_lock_interruptible_nested(&vma->vm->mutex, !wakeref);
+	if (err)
+		goto out_rpm;
+
+	err = __i915_vma_unbind(vma);
+	mutex_unlock(&vm->mutex);
+
+out_rpm:
+	if (wakeref)
+		intel_runtime_pm_put(&vm->i915->runtime_pm, wakeref);
+	return err;
+}
+
+int i915_vma_unbind_async(struct i915_vma *vma, bool trylock_vm)
+{
+	struct drm_i915_gem_object *obj = vma->obj;
+	struct i915_address_space *vm = vma->vm;
+	intel_wakeref_t wakeref = 0;
+	struct dma_fence *fence;
+	int err;
+
+	/*
+	 * We need the dma-resv lock since we add the
+	 * unbind fence to the dma-resv object.
+	 */
+	assert_object_held(obj);
+
+	if (!drm_mm_node_allocated(&vma->node))
+		return 0;
+
+	if (i915_vma_is_pinned(vma)) {
+		vma_print_allocator(vma, "is pinned");
+		return -EAGAIN;
+	}
+
+	if (!obj->mm.rsgt)
+		return -EBUSY;
+
+	err = dma_resv_reserve_fences(obj->base.resv, 2);
+	if (err)
+		return -EBUSY;
+
+	/*
+	 * It would be great if we could grab this wakeref from the
+	 * async unbind work if needed, but we can't because it uses
+	 * kmalloc and it's in the dma-fence signalling critical path.
+	 */
+	if (i915_vma_is_bound(vma, I915_VMA_GLOBAL_BIND))
+		wakeref = intel_runtime_pm_get(&vm->i915->runtime_pm);
+
+	if (trylock_vm && !mutex_trylock(&vm->mutex)) {
+		err = -EBUSY;
+		goto out_rpm;
+	} else if (!trylock_vm) {
+		err = mutex_lock_interruptible_nested(&vm->mutex, !wakeref);
+		if (err)
+			goto out_rpm;
+	}
+
+	fence = __i915_vma_unbind_async(vma);
+	mutex_unlock(&vm->mutex);
+	if (IS_ERR_OR_NULL(fence)) {
+		err = PTR_ERR_OR_ZERO(fence);
+		goto out_rpm;
+	}
+
+	dma_resv_add_fence(obj->base.resv, fence, DMA_RESV_USAGE_READ);
+	dma_fence_put(fence);
+
+out_rpm:
+	if (wakeref)
+		intel_runtime_pm_put(&vm->i915->runtime_pm, wakeref);
+	return err;
+}
+
+int i915_vma_unbind_unlocked(struct i915_vma *vma)
+{
+	int err;
+
+	i915_gem_object_lock(vma->obj, NULL);
+	err = i915_vma_unbind(vma);
+	i915_gem_object_unlock(vma->obj);
+
+	return err;
+}
+
+struct i915_vma *i915_vma_make_unshrinkable(struct i915_vma *vma)
+{
+	i915_gem_object_make_unshrinkable(vma->obj);
+	return vma;
+}
+
+void i915_vma_make_shrinkable(struct i915_vma *vma)
+{
+	i915_gem_object_make_shrinkable(vma->obj);
+}
+
+void i915_vma_make_purgeable(struct i915_vma *vma)
+{
+	i915_gem_object_make_purgeable(vma->obj);
+}
+
+#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
+#include "selftests/i915_vma.c"
+#endif
+
+void i915_vma_module_exit(void)
+{
+	kmem_cache_destroy(slab_vmas);
+}
+
+int __init i915_vma_module_init(void)
+{
+	slab_vmas = KMEM_CACHE(i915_vma, SLAB_HWCACHE_ALIGN);
+	if (!slab_vmas)
+		return -ENOMEM;
+
+	return 0;
+}