drm/i915: Start passing around i915_vma from execbuffer

During execbuffer we look up the i915_vma in order to reserve them in
the VM. However, we then do a double lookup of the vma in order to then
pin them, all because we lack the necessary interfaces to operate on
i915_vma - so introduce i915_vma_pin()!

v2: Tidy parameter lists to remove one level of redirection in the hot
path.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@intel.com>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1470324762-2545-15-git-send-email-chris@chris-wilson.co.uk

drivers/gpu/drm/i915/i915_drv.h

@@ -3018,23 +3018,6 @@ struct drm_i915_gem_object *i915_gem_object_create_from_data(
 void i915_gem_close_object(struct drm_gem_object *gem, struct drm_file *file);
 void i915_gem_free_object(struct drm_gem_object *obj);
 
-/* Flags used by pin/bind&friends. */
-#define PIN_MAPPABLE	(1<<0)
-#define PIN_NONBLOCK	(1<<1)
-#define PIN_GLOBAL	(1<<2)
-#define PIN_OFFSET_BIAS	(1<<3)
-#define PIN_USER	(1<<4)
-#define PIN_UPDATE	(1<<5)
-#define PIN_ZONE_4G	(1<<6)
-#define PIN_HIGH	(1<<7)
-#define PIN_OFFSET_FIXED	(1<<8)
-#define PIN_OFFSET_MASK (~4095)
-int __must_check
-i915_gem_object_pin(struct drm_i915_gem_object *obj,
-		    struct i915_address_space *vm,
-		    u64 size,
-		    u64 alignment,
-		    u64 flags);
 int __must_check
 i915_gem_object_ggtt_pin(struct drm_i915_gem_object *obj,
 			 const struct i915_ggtt_view *view,
@@ -3311,11 +3294,8 @@ i915_gem_obj_ggtt_pin(struct drm_i915_gem_object *obj,
 		      uint32_t alignment,
 		      unsigned flags)
 {
-	struct drm_i915_private *dev_priv = to_i915(obj->base.dev);
-	struct i915_ggtt *ggtt = &dev_priv->ggtt;
-
-	return i915_gem_object_pin(obj, &ggtt->base, 0, alignment,
-				   flags | PIN_GLOBAL);
+	return i915_gem_object_ggtt_pin(obj, &i915_ggtt_view_normal,
+					0, alignment, flags);
 }
 
 void i915_gem_object_ggtt_unpin_view(struct drm_i915_gem_object *obj,

drivers/gpu/drm/i915/i915_gem.c

@@ -2963,34 +2963,30 @@ static bool i915_gem_valid_gtt_space(struct i915_vma *vma,
 }
 
 /**
- * Finds free space in the GTT aperture and binds the object or a view of it
- * there.
- * @obj: object to bind
- * @vm: address space to bind into
- * @ggtt_view: global gtt view if applicable
+ * 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: requested alignment
+ * @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 struct i915_vma *
-i915_gem_object_insert_into_vm(struct drm_i915_gem_object *obj,
-			       struct i915_address_space *vm,
-			       const struct i915_ggtt_view *ggtt_view,
-			       u64 size,
-			       u64 alignment,
-			       u64 flags)
+static int
+i915_vma_insert(struct i915_vma *vma, u64 size, u64 alignment, u64 flags)
 {
-	struct drm_i915_private *dev_priv = to_i915(obj->base.dev);
-	struct i915_vma *vma;
+	struct drm_i915_private *dev_priv = to_i915(vma->vm->dev);
+	struct drm_i915_gem_object *obj = vma->obj;
 	u64 start, end;
 	u64 min_alignment;
 	int ret;
 
-	vma = ggtt_view ?
-		i915_gem_obj_lookup_or_create_ggtt_vma(obj, ggtt_view) :
-		i915_gem_obj_lookup_or_create_vma(obj, vm);
-	if (IS_ERR(vma))
-		return vma;
+	GEM_BUG_ON(vma->bound);
+	GEM_BUG_ON(drm_mm_node_allocated(&vma->node));
 
 	size = max(size, vma->size);
 	if (flags & PIN_MAPPABLE)
@@ -3004,7 +3000,7 @@ i915_gem_object_insert_into_vm(struct drm_i915_gem_object *obj,
 	if (alignment & (min_alignment - 1)) {
 		DRM_DEBUG("Invalid object alignment requested %llu, minimum %llu\n",
 			  alignment, min_alignment);
-		return ERR_PTR(-EINVAL);
+		return -EINVAL;
 	}
 
 	start = flags & PIN_OFFSET_BIAS ? flags & PIN_OFFSET_MASK : 0;
@@ -3024,17 +3020,17 @@ i915_gem_object_insert_into_vm(struct drm_i915_gem_object *obj,
 			  size, obj->base.size,
 			  flags & PIN_MAPPABLE ? "mappable" : "total",
 			  end);
-		return ERR_PTR(-E2BIG);
+		return -E2BIG;
 	}
 
 	ret = i915_gem_object_get_pages(obj);
 	if (ret)
-		return ERR_PTR(ret);
+		return ret;
 
 	i915_gem_object_pin_pages(obj);
 
 	if (flags & PIN_OFFSET_FIXED) {
-		uint64_t offset = flags & PIN_OFFSET_MASK;
+		u64 offset = flags & PIN_OFFSET_MASK;
 		if (offset & (alignment - 1) || offset > end - size) {
 			ret = -EINVAL;
 			goto err_unpin;
@@ -3096,11 +3092,11 @@ i915_gem_object_insert_into_vm(struct drm_i915_gem_object *obj,
 	list_move_tail(&vma->vm_link, &vma->vm->inactive_list);
 	obj->bind_count++;
 
-	return vma;
+	return 0;
 
 err_unpin:
 	i915_gem_object_unpin_pages(obj);
-	return ERR_PTR(ret);
+	return ret;
 }
 
 bool
@@ -3661,6 +3657,9 @@ i915_vma_misplaced(struct i915_vma *vma, u64 size, u64 alignment, u64 flags)
 {
 	struct drm_i915_gem_object *obj = vma->obj;
 
+	if (!drm_mm_node_allocated(&vma->node))
+		return false;
+
 	if (vma->node.size < size)
 		return true;
 
@@ -3705,91 +3704,42 @@ void __i915_vma_set_map_and_fenceable(struct i915_vma *vma)
 	obj->map_and_fenceable = mappable && fenceable;
 }
 
-static int
-i915_gem_object_do_pin(struct drm_i915_gem_object *obj,
-		       struct i915_address_space *vm,
-		       const struct i915_ggtt_view *ggtt_view,
-		       u64 size,
-		       u64 alignment,
-		       u64 flags)
+int
+i915_vma_pin(struct i915_vma *vma, u64 size, u64 alignment, u64 flags)
 {
-	struct drm_i915_private *dev_priv = to_i915(obj->base.dev);
-	struct i915_vma *vma;
-	unsigned bound;
+	unsigned int bound = vma->bound;
 	int ret;
 
-	if (WARN_ON(vm == &dev_priv->mm.aliasing_ppgtt->base))
-		return -ENODEV;
-
-	if (WARN_ON(flags & (PIN_GLOBAL | PIN_MAPPABLE) && !i915_is_ggtt(vm)))
-		return -EINVAL;
-
-	if (WARN_ON((flags & (PIN_MAPPABLE | PIN_GLOBAL)) == PIN_MAPPABLE))
-		return -EINVAL;
-
-	if (WARN_ON(i915_is_ggtt(vm) != !!ggtt_view))
-		return -EINVAL;
-
-	vma = ggtt_view ? i915_gem_obj_to_ggtt_view(obj, ggtt_view) :
-			  i915_gem_obj_to_vma(obj, vm);
+	GEM_BUG_ON((flags & (PIN_GLOBAL | PIN_USER)) == 0);
+	GEM_BUG_ON((flags & PIN_GLOBAL) && !vma->is_ggtt);
 
-	if (vma) {
 	if (WARN_ON(i915_vma_pin_count(vma) == DRM_I915_GEM_OBJECT_MAX_PIN_COUNT))
 		return -EBUSY;
 
-		if (i915_vma_misplaced(vma, size, alignment, flags)) {
-			WARN(i915_vma_is_pinned(vma),
-			     "bo is already pinned in %s with incorrect alignment:"
-			     " offset=%08x %08x, req.alignment=%llx, req.map_and_fenceable=%d,"
-			     " obj->map_and_fenceable=%d\n",
-			     ggtt_view ? "ggtt" : "ppgtt",
-			     upper_32_bits(vma->node.start),
-			     lower_32_bits(vma->node.start),
-			     alignment,
-			     !!(flags & PIN_MAPPABLE),
-			     obj->map_and_fenceable);
-			ret = i915_vma_unbind(vma);
-			if (ret)
-				return ret;
-
-			vma = NULL;
-		}
-	}
+	/* Pin early to prevent the shrinker/eviction logic from destroying
+	 * our vma as we insert and bind.
+	 */
+	__i915_vma_pin(vma);
 
-	if (vma == NULL || !drm_mm_node_allocated(&vma->node)) {
-		vma = i915_gem_object_insert_into_vm(obj, vm, ggtt_view,
-						     size, alignment, flags);
-		if (IS_ERR(vma))
-			return PTR_ERR(vma);
+	if (!bound) {
+		ret = i915_vma_insert(vma, size, alignment, flags);
+		if (ret)
+			goto err;
 	}
 
-	bound = vma->bound;
-	ret = i915_vma_bind(vma, obj->cache_level, flags);
+	ret = i915_vma_bind(vma, vma->obj->cache_level, flags);
 	if (ret)
-		return ret;
+		goto err;
 
-	if (ggtt_view && ggtt_view->type == I915_GGTT_VIEW_NORMAL &&
-	    (bound ^ vma->bound) & GLOBAL_BIND) {
+	if ((bound ^ vma->bound) & GLOBAL_BIND)
 		__i915_vma_set_map_and_fenceable(vma);
-		WARN_ON(flags & PIN_MAPPABLE && !obj->map_and_fenceable);
-	}
 
 	GEM_BUG_ON(i915_vma_misplaced(vma, size, alignment, flags));
-
-	__i915_vma_pin(vma);
 	return 0;
-}
 
-int
-i915_gem_object_pin(struct drm_i915_gem_object *obj,
-		    struct i915_address_space *vm,
-		    u64 size,
-		    u64 alignment,
-		    u64 flags)
-{
-	return i915_gem_object_do_pin(obj, vm,
-				      i915_is_ggtt(vm) ? &i915_ggtt_view_normal : NULL,
-				      size, alignment, flags);
+err:
+	__i915_vma_unpin(vma);
+	return ret;
 }
 
 int
@@ -3799,14 +3749,35 @@ i915_gem_object_ggtt_pin(struct drm_i915_gem_object *obj,
 			 u64 alignment,
 			 u64 flags)
 {
-	struct drm_device *dev = obj->base.dev;
-	struct drm_i915_private *dev_priv = to_i915(dev);
-	struct i915_ggtt *ggtt = &dev_priv->ggtt;
+	struct i915_vma *vma;
+	int ret;
 
 	BUG_ON(!view);
 
-	return i915_gem_object_do_pin(obj, &ggtt->base, view,
-				      size, alignment, flags | PIN_GLOBAL);
+	vma = i915_gem_obj_lookup_or_create_ggtt_vma(obj, view);
+	if (IS_ERR(vma))
+		return PTR_ERR(vma);
+
+	if (i915_vma_misplaced(vma, size, alignment, flags)) {
+		if (flags & PIN_NONBLOCK &&
+		    (i915_vma_is_pinned(vma) || i915_vma_is_active(vma)))
+			return -ENOSPC;
+
+		WARN(i915_vma_is_pinned(vma),
+		     "bo is already pinned in ggtt with incorrect alignment:"
+		     " offset=%08x %08x, req.alignment=%llx, req.map_and_fenceable=%d,"
+		     " obj->map_and_fenceable=%d\n",
+		     upper_32_bits(vma->node.start),
+		     lower_32_bits(vma->node.start),
+		     alignment,
+		     !!(flags & PIN_MAPPABLE),
+		     obj->map_and_fenceable);
+		ret = i915_vma_unbind(vma);
+		if (ret)
+			return ret;
+	}
+
+	return i915_vma_pin(vma, size, alignment, flags | PIN_GLOBAL);
 }
 
 void

drivers/gpu/drm/i915/i915_gem_execbuffer.c

@@ -45,11 +45,10 @@
 struct i915_execbuffer_params {
 	struct drm_device               *dev;
 	struct drm_file                 *file;
+	struct i915_vma			*batch;
 	u32				dispatch_flags;
 	u32				args_batch_start_offset;
-	u32				 batch_obj_vm_offset;
 	struct intel_engine_cs          *engine;
-	struct drm_i915_gem_object      *batch_obj;
 	struct i915_gem_context         *ctx;
 	struct drm_i915_gem_request     *request;
 };
@@ -102,6 +101,26 @@ eb_reset(struct eb_vmas *eb)
 		memset(eb->buckets, 0, (eb->and+1)*sizeof(struct hlist_head));
 }
 
+static struct i915_vma *
+eb_get_batch(struct eb_vmas *eb)
+{
+	struct i915_vma *vma = list_entry(eb->vmas.prev, typeof(*vma), exec_list);
+
+	/*
+	 * SNA is doing fancy tricks with compressing batch buffers, which leads
+	 * to negative relocation deltas. Usually that works out ok since the
+	 * relocate address is still positive, except when the batch is placed
+	 * very low in the GTT. Ensure this doesn't happen.
+	 *
+	 * Note that actual hangs have only been observed on gen7, but for
+	 * paranoia do it everywhere.
+	 */
+	if ((vma->exec_entry->flags & EXEC_OBJECT_PINNED) == 0)
+		vma->exec_entry->flags |= __EXEC_OBJECT_NEEDS_BIAS;
+
+	return vma;
+}
+
 static int
 eb_lookup_vmas(struct eb_vmas *eb,
 	       struct drm_i915_gem_exec_object2 *exec,
@@ -198,35 +217,6 @@ eb_lookup_vmas(struct eb_vmas *eb,
 	return ret;
 }
 
-static inline struct i915_vma *
-eb_get_batch_vma(struct eb_vmas *eb)
-{
-	/* The batch is always the LAST item in the VMA list */
-	struct i915_vma *vma = list_last_entry(&eb->vmas, typeof(*vma), exec_list);
-
-	return vma;
-}
-
-static struct drm_i915_gem_object *
-eb_get_batch(struct eb_vmas *eb)
-{
-	struct i915_vma *vma = eb_get_batch_vma(eb);
-
-	/*
-	 * SNA is doing fancy tricks with compressing batch buffers, which leads
-	 * to negative relocation deltas. Usually that works out ok since the
-	 * relocate address is still positive, except when the batch is placed
-	 * very low in the GTT. Ensure this doesn't happen.
-	 *
-	 * Note that actual hangs have only been observed on gen7, but for
-	 * paranoia do it everywhere.
-	 */
-	if ((vma->exec_entry->flags & EXEC_OBJECT_PINNED) == 0)
-		vma->exec_entry->flags |= __EXEC_OBJECT_NEEDS_BIAS;
-
-	return vma->obj;
-}
-
 static struct i915_vma *eb_get_vma(struct eb_vmas *eb, unsigned long handle)
 {
 	if (eb->and < 0) {
@@ -682,13 +672,13 @@ i915_gem_execbuffer_reserve_vma(struct i915_vma *vma,
 			flags |= PIN_HIGH;
 	}
 
-	ret = i915_gem_object_pin(obj, vma->vm,
+	ret = i915_vma_pin(vma,
 			   entry->pad_to_size,
 			   entry->alignment,
 			   flags);
 	if ((ret == -ENOSPC || ret == -E2BIG) &&
 	    only_mappable_for_reloc(entry->flags))
-		ret = i915_gem_object_pin(obj, vma->vm,
+		ret = i915_vma_pin(vma,
 				   entry->pad_to_size,
 				   entry->alignment,
 				   flags & ~PIN_MAPPABLE);
@@ -1252,11 +1242,11 @@ i915_reset_gen7_sol_offsets(struct drm_i915_gem_request *req)
 	return 0;
 }
 
-static struct drm_i915_gem_object*
+static struct i915_vma*
 i915_gem_execbuffer_parse(struct intel_engine_cs *engine,
 			  struct drm_i915_gem_exec_object2 *shadow_exec_entry,
-			  struct eb_vmas *eb,
 			  struct drm_i915_gem_object *batch_obj,
+			  struct eb_vmas *eb,
 			  u32 batch_start_offset,
 			  u32 batch_len,
 			  bool is_master)
@@ -1268,7 +1258,7 @@ i915_gem_execbuffer_parse(struct intel_engine_cs *engine,
 	shadow_batch_obj = i915_gem_batch_pool_get(&engine->batch_pool,
 						   PAGE_ALIGN(batch_len));
 	if (IS_ERR(shadow_batch_obj))
-		return shadow_batch_obj;
+		return ERR_CAST(shadow_batch_obj);
 
 	ret = intel_engine_cmd_parser(engine,
 				      batch_obj,
@@ -1293,14 +1283,12 @@ i915_gem_execbuffer_parse(struct intel_engine_cs *engine,
 	i915_gem_object_get(shadow_batch_obj);
 	list_add_tail(&vma->exec_list, &eb->vmas);
 
-	shadow_batch_obj->base.pending_read_domains = I915_GEM_DOMAIN_COMMAND;
-
-	return shadow_batch_obj;
+	return vma;
 
 err:
 	i915_gem_object_unpin_pages(shadow_batch_obj);
 	if (ret == -EACCES) /* unhandled chained batch */
-		return batch_obj;
+		return NULL;
 	else
 		return ERR_PTR(ret);
 }
@@ -1381,11 +1369,11 @@ execbuf_submit(struct i915_execbuffer_params *params,
 	}
 
 	exec_len   = args->batch_len;
-	exec_start = params->batch_obj_vm_offset +
+	exec_start = params->batch->node.start +
 		     params->args_batch_start_offset;
 
 	if (exec_len == 0)
-		exec_len = params->batch_obj->base.size;
+		exec_len = params->batch->size;
 
 	ret = params->engine->emit_bb_start(params->request,
 					    exec_start, exec_len,
@@ -1489,7 +1477,6 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data,
 	struct drm_i915_private *dev_priv = to_i915(dev);
 	struct i915_ggtt *ggtt = &dev_priv->ggtt;
 	struct eb_vmas *eb;
-	struct drm_i915_gem_object *batch_obj;
 	struct drm_i915_gem_exec_object2 shadow_exec_entry;
 	struct intel_engine_cs *engine;
 	struct i915_gem_context *ctx;
@@ -1583,7 +1570,7 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data,
 		goto err;
 
 	/* take note of the batch buffer before we might reorder the lists */
-	batch_obj = eb_get_batch(eb);
+	params->batch = eb_get_batch(eb);
 
 	/* Move the objects en-masse into the GTT, evicting if necessary. */
 	need_relocs = (args->flags & I915_EXEC_NO_RELOC) == 0;
@@ -1607,7 +1594,7 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data,
 	}
 
 	/* Set the pending read domains for the batch buffer to COMMAND */
-	if (batch_obj->base.pending_write_domain) {
+	if (params->batch->obj->base.pending_write_domain) {
 		DRM_DEBUG("Attempting to use self-modifying batch buffer\n");
 		ret = -EINVAL;
 		goto err;
@@ -1615,26 +1602,20 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data,
 
 	params->args_batch_start_offset = args->batch_start_offset;
 	if (intel_engine_needs_cmd_parser(engine) && args->batch_len) {
-		struct drm_i915_gem_object *parsed_batch_obj;
+		struct i915_vma *vma;
 
-		parsed_batch_obj = i915_gem_execbuffer_parse(engine,
-							     &shadow_exec_entry,
+		vma = i915_gem_execbuffer_parse(engine, &shadow_exec_entry,
+						params->batch->obj,
 						eb,
-							     batch_obj,
 						args->batch_start_offset,
 						args->batch_len,
 						drm_is_current_master(file));
-		if (IS_ERR(parsed_batch_obj)) {
-			ret = PTR_ERR(parsed_batch_obj);
+		if (IS_ERR(vma)) {
+			ret = PTR_ERR(vma);
 			goto err;
 		}
 
-		/*
-		 * parsed_batch_obj == batch_obj means batch not fully parsed:
-		 * Accept, but don't promote to secure.
-		 */
-
-		if (parsed_batch_obj != batch_obj) {
+		if (vma) {
 			/*
 			 * Batch parsed and accepted:
 			 *
@@ -1646,16 +1627,18 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data,
 			 */
 			dispatch_flags |= I915_DISPATCH_SECURE;
 			params->args_batch_start_offset = 0;
-			batch_obj = parsed_batch_obj;
+			params->batch = vma;
 		}
 	}
 
-	batch_obj->base.pending_read_domains |= I915_GEM_DOMAIN_COMMAND;
+	params->batch->obj->base.pending_read_domains |= I915_GEM_DOMAIN_COMMAND;
 
 	/* snb/ivb/vlv conflate the "batch in ppgtt" bit with the "non-secure
 	 * batch" bit. Hence we need to pin secure batches into the global gtt.
 	 * hsw should have this fixed, but bdw mucks it up again. */
 	if (dispatch_flags & I915_DISPATCH_SECURE) {
+		struct drm_i915_gem_object *obj = params->batch->obj;
+
 		/*
 		 * So on first glance it looks freaky that we pin the batch here
 		 * outside of the reservation loop. But:
@@ -1666,13 +1649,12 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data,
 		 *   fitting due to fragmentation.
 		 * So this is actually safe.
 		 */
-		ret = i915_gem_obj_ggtt_pin(batch_obj, 0, 0);
+		ret = i915_gem_obj_ggtt_pin(obj, 0, 0);
 		if (ret)
 			goto err;
 
-		params->batch_obj_vm_offset = i915_gem_obj_ggtt_offset(batch_obj);
-	} else
-		params->batch_obj_vm_offset = i915_gem_obj_offset(batch_obj, vm);
+		params->batch = i915_gem_obj_to_ggtt(obj);
+	}
 
 	/* Allocate a request for this batch buffer nice and early. */
 	params->request = i915_gem_request_alloc(engine, ctx);
@@ -1695,12 +1677,11 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data,
 	params->file                    = file;
 	params->engine                    = engine;
 	params->dispatch_flags          = dispatch_flags;
-	params->batch_obj               = batch_obj;
 	params->ctx                     = ctx;
 
 	ret = execbuf_submit(params, args, &eb->vmas);
 err_request:
-	__i915_add_request(params->request, params->batch_obj, ret == 0);
+	__i915_add_request(params->request, params->batch->obj, ret == 0);
 
 err_batch_unpin:
 	/*
@@ -1710,8 +1691,7 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data,
 	 * active.
 	 */
 	if (dispatch_flags & I915_DISPATCH_SECURE)
-		i915_gem_object_ggtt_unpin(batch_obj);
-
+		i915_vma_unpin(params->batch);
 err:
 	/* the request owns the ref now */
 	i915_gem_context_put(ctx);

drivers/gpu/drm/i915/i915_gem_gtt.c

@@ -3665,13 +3665,10 @@ int i915_vma_bind(struct i915_vma *vma, enum i915_cache_level cache_level,
 		return 0;
 
 	if (vma->bound == 0 && vma->vm->allocate_va_range) {
-		/* XXX: i915_vma_pin() will fix this +- hack */
-		__i915_vma_pin(vma);
 		trace_i915_va_alloc(vma);
 		ret = vma->vm->allocate_va_range(vma->vm,
 						 vma->node.start,
 						 vma->node.size);
-		__i915_vma_unpin(vma);
 		if (ret)
 			return ret;
 	}

drivers/gpu/drm/i915/i915_gem_gtt.h

@@ -609,6 +609,20 @@ i915_ggtt_view_equal(const struct i915_ggtt_view *a,
 	return true;
 }
 
+int __must_check
+i915_vma_pin(struct i915_vma *vma, u64 size, u64 alignment, u64 flags);
+/* Flags used by pin/bind&friends. */
+#define PIN_MAPPABLE		BIT(0)
+#define PIN_NONBLOCK		BIT(1)
+#define PIN_GLOBAL		BIT(2)
+#define PIN_OFFSET_BIAS		BIT(3)
+#define PIN_USER		BIT(4)
+#define PIN_UPDATE		BIT(5)
+#define PIN_ZONE_4G		BIT(6)
+#define PIN_HIGH		BIT(7)
+#define PIN_OFFSET_FIXED	BIT(8)
+#define PIN_OFFSET_MASK		(~4095)
+
 static inline int i915_vma_pin_count(const struct i915_vma *vma)
 {
 	return vma->pin_count;