nouveau_bo.c

		return;

	if (!node->bar_vma.node)
		return;

	nouveau_vm_unmap(&node->bar_vma);
	nouveau_vm_put(&node->bar_vma);
}

static int
nouveau_ttm_fault_reserve_notify(struct ttm_buffer_object *bo)
{
	struct drm_nouveau_private *dev_priv = nouveau_bdev(bo->bdev);
	struct nouveau_bo *nvbo = nouveau_bo(bo);

	/* as long as the bo isn't in vram, and isn't tiled, we've got
	 * nothing to do here.
	 */
	if (bo->mem.mem_type != TTM_PL_VRAM) {
		if (dev_priv->card_type < NV_50 ||
		    !nouveau_bo_tile_layout(nvbo))
			return 0;
	}

	/* make sure bo is in mappable vram */
	if (bo->mem.start + bo->mem.num_pages < dev_priv->fb_mappable_pages)
		return 0;


	nvbo->placement.fpfn = 0;
	nvbo->placement.lpfn = dev_priv->fb_mappable_pages;
	nouveau_bo_placement_set(nvbo, TTM_PL_VRAM, 0);
	return nouveau_bo_validate(nvbo, false, true, false);
}

void
nouveau_bo_fence(struct nouveau_bo *nvbo, struct nouveau_fence *fence)
{
	struct nouveau_fence *old_fence;

	if (likely(fence))
		nouveau_fence_ref(fence);

	spin_lock(&nvbo->bo.bdev->fence_lock);
	old_fence = nvbo->bo.sync_obj;
	nvbo->bo.sync_obj = fence;
	spin_unlock(&nvbo->bo.bdev->fence_lock);

	nouveau_fence_unref(&old_fence);
}

struct ttm_bo_driver nouveau_bo_driver = {
	.ttm_tt_create = &nouveau_ttm_tt_create,
	.ttm_tt_populate = &ttm_pool_populate,
	.ttm_tt_unpopulate = &ttm_pool_unpopulate,
	.invalidate_caches = nouveau_bo_invalidate_caches,
	.init_mem_type = nouveau_bo_init_mem_type,
	.evict_flags = nouveau_bo_evict_flags,
	.move_notify = nouveau_bo_move_ntfy,
	.move = nouveau_bo_move,
	.verify_access = nouveau_bo_verify_access,
	.sync_obj_signaled = __nouveau_fence_signalled,
	.sync_obj_wait = __nouveau_fence_wait,
	.sync_obj_flush = __nouveau_fence_flush,
	.sync_obj_unref = __nouveau_fence_unref,
	.sync_obj_ref = __nouveau_fence_ref,
	.fault_reserve_notify = &nouveau_ttm_fault_reserve_notify,
	.io_mem_reserve = &nouveau_ttm_io_mem_reserve,
	.io_mem_free = &nouveau_ttm_io_mem_free,
};

struct nouveau_vma *
nouveau_bo_vma_find(struct nouveau_bo *nvbo, struct nouveau_vm *vm)
{
	struct nouveau_vma *vma;
	list_for_each_entry(vma, &nvbo->vma_list, head) {
		if (vma->vm == vm)
			return vma;
	}

	return NULL;
}

int
nouveau_bo_vma_add(struct nouveau_bo *nvbo, struct nouveau_vm *vm,
		   struct nouveau_vma *vma)
{
	const u32 size = nvbo->bo.mem.num_pages << PAGE_SHIFT;
	struct nouveau_mem *node = nvbo->bo.mem.mm_node;
	int ret;

	ret = nouveau_vm_get(vm, size, nvbo->page_shift,
			     NV_MEM_ACCESS_RW, vma);
	if (ret)
		return ret;

	if (nvbo->bo.mem.mem_type == TTM_PL_VRAM)
		nouveau_vm_map(vma, nvbo->bo.mem.mm_node);
	else
	if (nvbo->bo.mem.mem_type == TTM_PL_TT)
		nouveau_vm_map_sg(vma, 0, size, node, node->pages);

	list_add_tail(&vma->head, &nvbo->vma_list);
	vma->refcount = 1;
	return 0;
}

void
nouveau_bo_vma_del(struct nouveau_bo *nvbo, struct nouveau_vma *vma)
{
	if (vma->node) {
		if (nvbo->bo.mem.mem_type != TTM_PL_SYSTEM) {
			spin_lock(&nvbo->bo.bdev->fence_lock);
			ttm_bo_wait(&nvbo->bo, false, false, false);
			spin_unlock(&nvbo->bo.bdev->fence_lock);
			nouveau_vm_unmap(vma);
		}

		nouveau_vm_put(vma);
		list_del(&vma->head);
	}
}