drm/i915: Combine unbound/bound list tracking for objects

With async binding, we don't want to manage a bound/unbound list as we
may end up running before we even acquire the pages. All that is
required is keeping track of shrinkable objects, so reduce it to the
minimum list.

Fixes: 6951e589 ("drm/i915: Move GEM object domain management from struct_mutex to local")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Matthew Auld <matthew.william.auld@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190612105720.30310-1-chris@chris-wilson.co.uk

drivers/gpu/drm/i915/gem/i915_gem_domain.c

@@ -219,7 +219,7 @@ int i915_gem_object_set_cache_level(struct drm_i915_gem_object *obj,
 	 * rewrite the PTE in the belief that doing so tramples upon less
 	 * state and so involves less work.
 	 */
-	if (obj->bind_count) {
+	if (atomic_read(&obj->bind_count)) {
 		/* Before we change the PTE, the GPU must not be accessing it.
 		 * If we wait upon the object, we know that all the bound
 		 * VMA are no longer active.
@@ -480,13 +480,8 @@ static void i915_gem_object_bump_inactive_ggtt(struct drm_i915_gem_object *obj)
 
 		spin_lock_irqsave(&i915->mm.obj_lock, flags);
 
-		if (obj->mm.madv == I915_MADV_WILLNEED) {
-			struct list_head *list;
-
-			list = obj->bind_count ?
-				&i915->mm.bound_list : &i915->mm.unbound_list;
-			list_move_tail(&obj->mm.link, list);
-		}
+		if (obj->mm.madv == I915_MADV_WILLNEED)
+			list_move_tail(&obj->mm.link, &i915->mm.shrink_list);
 
 		spin_unlock_irqrestore(&i915->mm.obj_lock, flags);
 	}

drivers/gpu/drm/i915/gem/i915_gem_object.c

@@ -216,7 +216,7 @@ static void __i915_gem_free_objects(struct drm_i915_private *i915,
 
 		mutex_unlock(&i915->drm.struct_mutex);
 
-		GEM_BUG_ON(obj->bind_count);
+		GEM_BUG_ON(atomic_read(&obj->bind_count));
 		GEM_BUG_ON(obj->userfault_count);
 		GEM_BUG_ON(atomic_read(&obj->frontbuffer_bits));
 		GEM_BUG_ON(!list_empty(&obj->lut_list));

drivers/gpu/drm/i915/gem/i915_gem_object_types.h

@@ -155,7 +155,7 @@ struct drm_i915_gem_object {
 #define STRIDE_MASK (~TILING_MASK)
 
 	/** Count of VMA actually bound by this object */
-	unsigned int bind_count;
+	atomic_t bind_count;
 	unsigned int active_count;
 	/** Count of how many global VMA are currently pinned for use by HW */
 	unsigned int pin_global;

drivers/gpu/drm/i915/gem/i915_gem_pages.c

@@ -57,13 +57,19 @@ void __i915_gem_object_set_pages(struct drm_i915_gem_object *obj,
 	GEM_BUG_ON(!HAS_PAGE_SIZES(i915, obj->mm.page_sizes.sg));
 
 	if (i915_gem_object_is_shrinkable(obj)) {
+		struct list_head *list;
 		unsigned long flags;
 
 		spin_lock_irqsave(&i915->mm.obj_lock, flags);
 
 		i915->mm.shrink_count++;
 		i915->mm.shrink_memory += obj->base.size;
-		list_add(&obj->mm.link, &i915->mm.unbound_list);
+
+		if (obj->mm.madv != I915_MADV_WILLNEED)
+			list = &i915->mm.purge_list;
+		else
+			list = &i915->mm.shrink_list;
+		list_add_tail(&obj->mm.link, list);
 
 		spin_unlock_irqrestore(&i915->mm.obj_lock, flags);
 	}
@@ -193,7 +199,7 @@ int __i915_gem_object_put_pages(struct drm_i915_gem_object *obj,
 	if (i915_gem_object_has_pinned_pages(obj))
 		return -EBUSY;
 
-	GEM_BUG_ON(obj->bind_count);
+	GEM_BUG_ON(atomic_read(&obj->bind_count));
 
 	/* May be called by shrinker from within get_pages() (on another bo) */
 	mutex_lock_nested(&obj->mm.lock, subclass);

drivers/gpu/drm/i915/gem/i915_gem_pm.c

@@ -158,15 +158,22 @@ void i915_gem_suspend(struct drm_i915_private *i915)
 	intel_uc_suspend(i915);
 }
 
+static struct drm_i915_gem_object *first_mm_object(struct list_head *list)
+{
+	return list_first_entry_or_null(list,
+					struct drm_i915_gem_object,
+					mm.link);
+}
+
 void i915_gem_suspend_late(struct drm_i915_private *i915)
 {
 	struct drm_i915_gem_object *obj;
 	struct list_head *phases[] = {
-		&i915->mm.unbound_list,
-		&i915->mm.bound_list,
+		&i915->mm.shrink_list,
 		&i915->mm.purge_list,
 		NULL
 	}, **phase;
+	unsigned long flags;
 
 	/*
 	 * Neither the BIOS, ourselves or any other kernel
@@ -188,13 +195,30 @@ void i915_gem_suspend_late(struct drm_i915_private *i915)
 	 * machine in an unusable condition.
 	 */
 
+	spin_lock_irqsave(&i915->mm.obj_lock, flags);
 	for (phase = phases; *phase; phase++) {
-		list_for_each_entry(obj, *phase, mm.link) {
+		LIST_HEAD(keep);
+
+		while ((obj = first_mm_object(*phase))) {
+			list_move_tail(&obj->mm.link, &keep);
+
+			/* Beware the background _i915_gem_free_objects */
+			if (!kref_get_unless_zero(&obj->base.refcount))
+				continue;
+
+			spin_unlock_irqrestore(&i915->mm.obj_lock, flags);
+
 			i915_gem_object_lock(obj);
 			WARN_ON(i915_gem_object_set_to_gtt_domain(obj, false));
 			i915_gem_object_unlock(obj);
+			i915_gem_object_put(obj);
+
+			spin_lock_irqsave(&i915->mm.obj_lock, flags);
 		}
+
+		list_splice_tail(&keep, *phase);
 	}
+	spin_unlock_irqrestore(&i915->mm.obj_lock, flags);
 
 	intel_uc_sanitize(i915);
 	i915_gem_sanitize(i915);

drivers/gpu/drm/i915/gem/i915_gem_shrinker.c

@@ -69,7 +69,7 @@ static bool can_release_pages(struct drm_i915_gem_object *obj)
 	 * to the GPU, simply unbinding from the GPU is not going to succeed
 	 * in releasing our pin count on the pages themselves.
 	 */
-	if (atomic_read(&obj->mm.pages_pin_count) > obj->bind_count)
+	if (atomic_read(&obj->mm.pages_pin_count) > atomic_read(&obj->bind_count))
 		return false;
 
 	/* If any vma are "permanently" pinned, it will prevent us from
@@ -145,8 +145,10 @@ i915_gem_shrink(struct drm_i915_private *i915,
 		unsigned int bit;
 	} phases[] = {
 		{ &i915->mm.purge_list, ~0u },
-		{ &i915->mm.unbound_list, I915_SHRINK_UNBOUND },
-		{ &i915->mm.bound_list, I915_SHRINK_BOUND },
+		{
+			&i915->mm.shrink_list,
+			I915_SHRINK_BOUND | I915_SHRINK_UNBOUND
+		},
 		{ NULL, 0 },
 	}, *phase;
 	intel_wakeref_t wakeref = 0;
@@ -238,7 +240,7 @@ i915_gem_shrink(struct drm_i915_private *i915,
 				continue;
 
 			if (!(shrink & I915_SHRINK_BOUND) &&
-			    READ_ONCE(obj->bind_count))
+			    atomic_read(&obj->bind_count))
 				continue;
 
 			if (!can_release_pages(obj))
@@ -378,7 +380,7 @@ i915_gem_shrinker_oom(struct notifier_block *nb, unsigned long event, void *ptr)
 	struct drm_i915_private *i915 =
 		container_of(nb, struct drm_i915_private, mm.oom_notifier);
 	struct drm_i915_gem_object *obj;
-	unsigned long unevictable, bound, unbound, freed_pages;
+	unsigned long unevictable, available, freed_pages;
 	intel_wakeref_t wakeref;
 	unsigned long flags;
 
@@ -393,26 +395,20 @@ i915_gem_shrinker_oom(struct notifier_block *nb, unsigned long event, void *ptr)
 	 * assert that there are no objects with pinned pages that are not
 	 * being pointed to by hardware.
 	 */
-	unbound = bound = unevictable = 0;
+	available = unevictable = 0;
 	spin_lock_irqsave(&i915->mm.obj_lock, flags);
-	list_for_each_entry(obj, &i915->mm.unbound_list, mm.link) {
+	list_for_each_entry(obj, &i915->mm.shrink_list, mm.link) {
 		if (!can_release_pages(obj))
 			unevictable += obj->base.size >> PAGE_SHIFT;
 		else
-			unbound += obj->base.size >> PAGE_SHIFT;
-	}
-	list_for_each_entry(obj, &i915->mm.bound_list, mm.link) {
-		if (!can_release_pages(obj))
-			unevictable += obj->base.size >> PAGE_SHIFT;
-		else
-			bound += obj->base.size >> PAGE_SHIFT;
+			available += obj->base.size >> PAGE_SHIFT;
 	}
 	spin_unlock_irqrestore(&i915->mm.obj_lock, flags);
 
-	if (freed_pages || unbound || bound)
+	if (freed_pages || available)
 		pr_info("Purging GPU memory, %lu pages freed, "
-			"%lu pages still pinned.\n",
-			freed_pages, unevictable);
+			"%lu pages still pinned, %lu pages left available.\n",
+			freed_pages, unevictable, available);
 
 	*(unsigned long *)ptr += freed_pages;
 	return NOTIFY_DONE;

drivers/gpu/drm/i915/gem/i915_gem_stolen.c

@@ -613,7 +613,6 @@ i915_gem_object_create_stolen_for_preallocated(struct drm_i915_private *dev_priv
 	struct drm_i915_gem_object *obj;
 	struct drm_mm_node *stolen;
 	struct i915_vma *vma;
-	unsigned long flags;
 	int ret;
 
 	if (!drm_mm_initialized(&dev_priv->mm.stolen))
@@ -690,10 +689,8 @@ i915_gem_object_create_stolen_for_preallocated(struct drm_i915_private *dev_priv
 	list_move_tail(&vma->vm_link, &ggtt->vm.bound_list);
 	mutex_unlock(&ggtt->vm.mutex);
 
-	spin_lock_irqsave(&dev_priv->mm.obj_lock, flags);
 	GEM_BUG_ON(i915_gem_object_is_shrinkable(obj));
-	obj->bind_count++;
-	spin_unlock_irqrestore(&dev_priv->mm.obj_lock, flags);
+	atomic_inc(&obj->bind_count);
 
 	return obj;
 

drivers/gpu/drm/i915/i915_debugfs.c

@@ -104,19 +104,6 @@ static char get_pin_mapped_flag(struct drm_i915_gem_object *obj)
 	return obj->mm.mapping ? 'M' : ' ';
 }
 
-static u64 i915_gem_obj_total_ggtt_size(struct drm_i915_gem_object *obj)
-{
-	u64 size = 0;
-	struct i915_vma *vma;
-
-	for_each_ggtt_vma(vma, obj) {
-		if (drm_mm_node_allocated(&vma->node))
-			size += vma->node.size;
-	}
-
-	return size;
-}
-
 static const char *
 stringify_page_sizes(unsigned int page_sizes, char *buf, size_t len)
 {
@@ -247,84 +234,6 @@ describe_obj(struct seq_file *m, struct drm_i915_gem_object *obj)
 		seq_printf(m, " (frontbuffer: 0x%03x)", frontbuffer_bits);
 }
 
-static int obj_rank_by_stolen(const void *A, const void *B)
-{
-	const struct drm_i915_gem_object *a =
-		*(const struct drm_i915_gem_object **)A;
-	const struct drm_i915_gem_object *b =
-		*(const struct drm_i915_gem_object **)B;
-
-	if (a->stolen->start < b->stolen->start)
-		return -1;
-	if (a->stolen->start > b->stolen->start)
-		return 1;
-	return 0;
-}
-
-static int i915_gem_stolen_list_info(struct seq_file *m, void *data)
-{
-	struct drm_i915_private *dev_priv = node_to_i915(m->private);
-	struct drm_device *dev = &dev_priv->drm;
-	struct drm_i915_gem_object **objects;
-	struct drm_i915_gem_object *obj;
-	u64 total_obj_size, total_gtt_size;
-	unsigned long total, count, n;
-	unsigned long flags;
-	int ret;
-
-	total = READ_ONCE(dev_priv->mm.shrink_count);
-	objects = kvmalloc_array(total, sizeof(*objects), GFP_KERNEL);
-	if (!objects)
-		return -ENOMEM;
-
-	ret = mutex_lock_interruptible(&dev->struct_mutex);
-	if (ret)
-		goto out;
-
-	total_obj_size = total_gtt_size = count = 0;
-
-	spin_lock_irqsave(&dev_priv->mm.obj_lock, flags);
-	list_for_each_entry(obj, &dev_priv->mm.bound_list, mm.link) {
-		if (count == total)
-			break;
-
-		if (obj->stolen == NULL)
-			continue;
-
-		objects[count++] = obj;
-		total_obj_size += obj->base.size;
-		total_gtt_size += i915_gem_obj_total_ggtt_size(obj);
-
-	}
-	list_for_each_entry(obj, &dev_priv->mm.unbound_list, mm.link) {
-		if (count == total)
-			break;
-
-		if (obj->stolen == NULL)
-			continue;
-
-		objects[count++] = obj;
-		total_obj_size += obj->base.size;
-	}
-	spin_unlock_irqrestore(&dev_priv->mm.obj_lock, flags);
-
-	sort(objects, count, sizeof(*objects), obj_rank_by_stolen, NULL);
-
-	seq_puts(m, "Stolen:\n");
-	for (n = 0; n < count; n++) {
-		seq_puts(m, "   ");
-		describe_obj(m, objects[n]);
-		seq_putc(m, '\n');
-	}
-	seq_printf(m, "Total %lu objects, %llu bytes, %llu GTT size\n",
-		   count, total_obj_size, total_gtt_size);
-
-	mutex_unlock(&dev->struct_mutex);
-out:
-	kvfree(objects);
-	return ret;
-}
-
 struct file_stats {
 	struct i915_address_space *vm;
 	unsigned long count;
@@ -344,7 +253,7 @@ static int per_file_stats(int id, void *ptr, void *data)
 
 	stats->count++;
 	stats->total += obj->base.size;
-	if (!obj->bind_count)
+	if (!atomic_read(&obj->bind_count))
 		stats->unbound += obj->base.size;
 	if (obj->base.name || obj->base.dma_buf)
 		stats->shared += obj->base.size;
@@ -451,105 +360,22 @@ static void print_context_stats(struct seq_file *m,
 
 static int i915_gem_object_info(struct seq_file *m, void *data)
 {
-	struct drm_i915_private *dev_priv = node_to_i915(m->private);
-	struct drm_device *dev = &dev_priv->drm;
-	struct i915_ggtt *ggtt = &dev_priv->ggtt;
-	u32 count, mapped_count, purgeable_count, dpy_count, huge_count;
-	u64 size, mapped_size, purgeable_size, dpy_size, huge_size;
-	struct drm_i915_gem_object *obj;
-	unsigned int page_sizes = 0;
-	unsigned long flags;
-	char buf[80];
+	struct drm_i915_private *i915 = node_to_i915(m->private);
 	int ret;
 
 	seq_printf(m, "%u shrinkable objects, %llu bytes\n",
-		   dev_priv->mm.shrink_count,
-		   dev_priv->mm.shrink_memory);
-
-	size = count = 0;
-	mapped_size = mapped_count = 0;
-	purgeable_size = purgeable_count = 0;
-	huge_size = huge_count = 0;
-
-	spin_lock_irqsave(&dev_priv->mm.obj_lock, flags);
-	list_for_each_entry(obj, &dev_priv->mm.unbound_list, mm.link) {
-		size += obj->base.size;
-		++count;
-
-		if (obj->mm.madv == I915_MADV_DONTNEED) {
-			purgeable_size += obj->base.size;
-			++purgeable_count;
-		}
-
-		if (obj->mm.mapping) {
-			mapped_count++;
-			mapped_size += obj->base.size;
-		}
-
-		if (obj->mm.page_sizes.sg > I915_GTT_PAGE_SIZE) {
-			huge_count++;
-			huge_size += obj->base.size;
-			page_sizes |= obj->mm.page_sizes.sg;
-		}
-	}
-	seq_printf(m, "%u unbound objects, %llu bytes\n", count, size);
-
-	size = count = dpy_size = dpy_count = 0;
-	list_for_each_entry(obj, &dev_priv->mm.bound_list, mm.link) {
-		size += obj->base.size;
-		++count;
-
-		if (obj->pin_global) {
-			dpy_size += obj->base.size;
-			++dpy_count;
-		}
-
-		if (obj->mm.madv == I915_MADV_DONTNEED) {
-			purgeable_size += obj->base.size;
-			++purgeable_count;
-		}
-
-		if (obj->mm.mapping) {
-			mapped_count++;
-			mapped_size += obj->base.size;
-		}
-
-		if (obj->mm.page_sizes.sg > I915_GTT_PAGE_SIZE) {
-			huge_count++;
-			huge_size += obj->base.size;
-			page_sizes |= obj->mm.page_sizes.sg;
-		}
-	}
-	spin_unlock_irqrestore(&dev_priv->mm.obj_lock, flags);
-
-	seq_printf(m, "%u bound objects, %llu bytes\n",
-		   count, size);
-	seq_printf(m, "%u purgeable objects, %llu bytes\n",
-		   purgeable_count, purgeable_size);
-	seq_printf(m, "%u mapped objects, %llu bytes\n",
-		   mapped_count, mapped_size);
-	seq_printf(m, "%u huge-paged objects (%s) %llu bytes\n",
-		   huge_count,
-		   stringify_page_sizes(page_sizes, buf, sizeof(buf)),
-		   huge_size);
-	seq_printf(m, "%u display objects (globally pinned), %llu bytes\n",
-		   dpy_count, dpy_size);
-
-	seq_printf(m, "%llu [%pa] gtt total\n",
-		   ggtt->vm.total, &ggtt->mappable_end);
-	seq_printf(m, "Supported page sizes: %s\n",
-		   stringify_page_sizes(INTEL_INFO(dev_priv)->page_sizes,
-					buf, sizeof(buf)));
+		   i915->mm.shrink_count,
+		   i915->mm.shrink_memory);
 
 	seq_putc(m, '\n');
 
-	ret = mutex_lock_interruptible(&dev->struct_mutex);
+	ret = mutex_lock_interruptible(&i915->drm.struct_mutex);
 	if (ret)
 		return ret;
 
-	print_batch_pool_stats(m, dev_priv);
-	print_context_stats(m, dev_priv);
-	mutex_unlock(&dev->struct_mutex);
+	print_batch_pool_stats(m, i915);
+	print_context_stats(m, i915);
+	mutex_unlock(&i915->drm.struct_mutex);
 
 	return 0;
 }
@@ -4535,7 +4361,6 @@ static const struct file_operations i915_fifo_underrun_reset_ops = {
 static const struct drm_info_list i915_debugfs_list[] = {
 	{"i915_capabilities", i915_capabilities, 0},
 	{"i915_gem_objects", i915_gem_object_info, 0},
-	{"i915_gem_stolen", i915_gem_stolen_list_info },
 	{"i915_gem_fence_regs", i915_gem_fence_regs_info, 0},
 	{"i915_gem_interrupt", i915_interrupt_info, 0},
 	{"i915_gem_batch_pool", i915_gem_batch_pool_info, 0},

drivers/gpu/drm/i915/i915_drv.h

@@ -747,19 +747,15 @@ struct i915_gem_mm {
 	/* Protects bound_list/unbound_list and #drm_i915_gem_object.mm.link */
 	spinlock_t obj_lock;
 
-	/** List of all objects in gtt_space. Used to restore gtt
-	 * mappings on resume */
-	struct list_head bound_list;
 	/**
-	 * List of objects which are not bound to the GTT (thus
-	 * are idle and not used by the GPU). These objects may or may
-	 * not actually have any pages attached.
+	 * List of objects which are purgeable.
 	 */
-	struct list_head unbound_list;
+	struct list_head purge_list;
+
 	/**
-	 * List of objects which are purgeable. May be active.
+	 * List of objects which have allocated pages and are shrinkable.
 	 */
-	struct list_head purge_list;
+	struct list_head shrink_list;
 
 	/** List of all objects in gtt_space, currently mmaped by userspace.
 	 * All objects within this list must also be on bound_list.

drivers/gpu/drm/i915/i915_gem.c

@@ -1144,10 +1144,8 @@ i915_gem_madvise_ioctl(struct drm_device *dev, void *data,
 
 			if (obj->mm.madv != I915_MADV_WILLNEED)
 				list = &i915->mm.purge_list;
-			else if (obj->bind_count)
-				list = &i915->mm.bound_list;
 			else
-				list = &i915->mm.unbound_list;
+				list = &i915->mm.shrink_list;
 			list_move_tail(&obj->mm.link, list);
 
 			spin_unlock_irqrestore(&i915->mm.obj_lock, flags);
@@ -1770,8 +1768,7 @@ static void i915_gem_init__mm(struct drm_i915_private *i915)
 	init_llist_head(&i915->mm.free_list);
 
 	INIT_LIST_HEAD(&i915->mm.purge_list);
-	INIT_LIST_HEAD(&i915->mm.unbound_list);
-	INIT_LIST_HEAD(&i915->mm.bound_list);
+	INIT_LIST_HEAD(&i915->mm.shrink_list);
 	INIT_LIST_HEAD(&i915->mm.fence_list);
 
 	INIT_LIST_HEAD(&i915->mm.userfault_list);
@@ -1837,11 +1834,7 @@ int i915_gem_freeze(struct drm_i915_private *dev_priv)
 int i915_gem_freeze_late(struct drm_i915_private *i915)
 {
 	struct drm_i915_gem_object *obj;
-	struct list_head *phases[] = {
-		&i915->mm.unbound_list,
-		&i915->mm.bound_list,
-		NULL
-	}, **phase;
+	intel_wakeref_t wakeref;
 
 	/*
 	 * Called just before we write the hibernation image.
@@ -1858,17 +1851,18 @@ int i915_gem_freeze_late(struct drm_i915_private *i915)
 	 * the objects as well, see i915_gem_freeze()
 	 */
 
-	i915_gem_shrink(i915, -1UL, NULL, I915_SHRINK_UNBOUND);
+	wakeref = intel_runtime_pm_get(i915);
+
+	i915_gem_shrink(i915, -1UL, NULL, ~0);
 	i915_gem_drain_freed_objects(i915);
 
-	for (phase = phases; *phase; phase++) {
-		list_for_each_entry(obj, *phase, mm.link) {
+	list_for_each_entry(obj, &i915->mm.shrink_list, mm.link) {
 		i915_gem_object_lock(obj);
 		WARN_ON(i915_gem_object_set_to_cpu_domain(obj, true));
 		i915_gem_object_unlock(obj);
 	}
-	}
-	GEM_BUG_ON(!list_empty(&i915->mm.purge_list));
+
+	intel_runtime_pm_put(i915, wakeref);
 
 	return 0;
 }

drivers/gpu/drm/i915/i915_vma.c

@@ -83,10 +83,7 @@ static void obj_bump_mru(struct drm_i915_gem_object *obj)
 	unsigned long flags;
 
 	spin_lock_irqsave(&i915->mm.obj_lock, flags);
-
-	if (obj->bind_count)
-		list_move_tail(&obj->mm.link, &i915->mm.bound_list);
-
+	list_move_tail(&obj->mm.link, &i915->mm.shrink_list);
 	spin_unlock_irqrestore(&i915->mm.obj_lock, flags);
 
 	obj->mm.dirty = true; /* be paranoid  */
@@ -538,7 +535,7 @@ static void assert_bind_count(const struct drm_i915_gem_object *obj)
 	 * assume that no else is pinning the pages, but as a rough assertion
 	 * that we will not run into problems later, this will do!)
 	 */
-	GEM_BUG_ON(atomic_read(&obj->mm.pages_pin_count) < obj->bind_count);
+	GEM_BUG_ON(atomic_read(&obj->mm.pages_pin_count) < atomic_read(&obj->bind_count));
 }
 
 /**
@@ -680,18 +677,8 @@ i915_vma_insert(struct i915_vma *vma, u64 size, u64 alignment, u64 flags)
 	mutex_unlock(&vma->vm->mutex);
 
 	if (vma->obj) {
-		struct drm_i915_gem_object *obj = vma->obj;
-		unsigned long flags;
-
-		spin_lock_irqsave(&dev_priv->mm.obj_lock, flags);
-
-		if (i915_gem_object_is_shrinkable(obj))
-			list_move_tail(&obj->mm.link, &dev_priv->mm.bound_list);
-
-		obj->bind_count++;
-		assert_bind_count(obj);
-
-		spin_unlock_irqrestore(&dev_priv->mm.obj_lock, flags);
+		atomic_inc(&vma->obj->bind_count);
+		assert_bind_count(vma->obj);
 	}
 
 	return 0;
@@ -707,8 +694,6 @@ i915_vma_insert(struct i915_vma *vma, u64 size, u64 alignment, u64 flags)
 static void
 i915_vma_remove(struct i915_vma *vma)
 {
-	struct drm_i915_private *i915 = vma->vm->i915;
-
 	GEM_BUG_ON(!drm_mm_node_allocated(&vma->node));
 	GEM_BUG_ON(vma->flags & (I915_VMA_GLOBAL_BIND | I915_VMA_LOCAL_BIND));
 
@@ -725,17 +710,8 @@ i915_vma_remove(struct i915_vma *vma)
 	 */
 	if (vma->obj) {
 		struct drm_i915_gem_object *obj = vma->obj;
-		unsigned long flags;
 
-		spin_lock_irqsave(&i915->mm.obj_lock, flags);
-
-		GEM_BUG_ON(obj->bind_count == 0);
-		if (--obj->bind_count == 0 &&
-		    i915_gem_object_is_shrinkable(obj) &&
-		    obj->mm.madv == I915_MADV_WILLNEED)
-			list_move_tail(&obj->mm.link, &i915->mm.unbound_list);
-
-		spin_unlock_irqrestore(&i915->mm.obj_lock, flags);
+		atomic_dec(&obj->bind_count);
 
 		/*
 		 * And finally now the object is completely decoupled from this

drivers/gpu/drm/i915/selftests/i915_gem_evict.c

@@ -67,20 +67,24 @@ static int populate_ggtt(struct drm_i915_private *i915,
 		count++;
 	}
 
+	bound = 0;
 	unbound = 0;
-	list_for_each_entry(obj, &i915->mm.unbound_list, mm.link)
-		if (obj->mm.quirked)
+	list_for_each_entry(obj, objects, st_link) {
+		GEM_BUG_ON(!obj->mm.quirked);
+
+		if (atomic_read(&obj->bind_count))
+			bound++;
+		else
 			unbound++;
+	}
+	GEM_BUG_ON(bound + unbound != count);
+
 	if (unbound) {
 		pr_err("%s: Found %lu objects unbound, expected %u!\n",
 		       __func__, unbound, 0);
 		return -EINVAL;
 	}
 
-	bound = 0;
-	list_for_each_entry(obj, &i915->mm.bound_list, mm.link)
-		if (obj->mm.quirked)
-			bound++;
 	if (bound != count) {
 		pr_err("%s: Found %lu objects bound, expected %lu!\n",
 		       __func__, bound, count);

drivers/gpu/drm/i915/selftests/i915_gem_gtt.c

@@ -1233,7 +1233,7 @@ static void track_vma_bind(struct i915_vma *vma)
 {
 	struct drm_i915_gem_object *obj = vma->obj;
 
-	obj->bind_count++; /* track for eviction later */
+	atomic_inc(&obj->bind_count); /* track for eviction later */
 	__i915_gem_object_pin_pages(obj);
 
 	vma->pages = obj->mm.pages;