diff --git a/drivers/gpu/drm/ttm/ttm_device.c b/drivers/gpu/drm/ttm/ttm_device.c
index 9eb8f54b66fcd..a021d029b7300 100644
--- a/drivers/gpu/drm/ttm/ttm_device.c
+++ b/drivers/gpu/drm/ttm/ttm_device.c
@@ -248,3 +248,50 @@ void ttm_device_fini(struct ttm_device *bdev)
 	ttm_global_release();
 }
 EXPORT_SYMBOL(ttm_device_fini);
+
+void ttm_device_clear_dma_mappings(struct ttm_device *bdev)
+{
+	struct ttm_resource_manager *man;
+	struct ttm_buffer_object *bo;
+	unsigned int i, j;
+
+	spin_lock(&bdev->lru_lock);
+	while (!list_empty(&bdev->pinned)) {
+		bo = list_first_entry(&bdev->pinned, struct ttm_buffer_object, lru);
+		/* Take ref against racing releases once lru_lock is unlocked */
+		if (ttm_bo_get_unless_zero(bo)) {
+			list_del_init(&bo->lru);
+			spin_unlock(&bdev->lru_lock);
+
+			if (bo->ttm)
+				ttm_tt_unpopulate(bo->bdev, bo->ttm);
+
+			ttm_bo_put(bo);
+			spin_lock(&bdev->lru_lock);
+		}
+	}
+
+	for (i = TTM_PL_SYSTEM; i < TTM_NUM_MEM_TYPES; ++i) {
+		man = ttm_manager_type(bdev, i);
+		if (!man || !man->use_tt)
+			continue;
+
+		for (j = 0; j < TTM_MAX_BO_PRIORITY; ++j) {
+			while (!list_empty(&man->lru[j])) {
+				bo = list_first_entry(&man->lru[j], struct ttm_buffer_object, lru);
+				if (ttm_bo_get_unless_zero(bo)) {
+					list_del_init(&bo->lru);
+					spin_unlock(&bdev->lru_lock);
+
+					if (bo->ttm)
+						ttm_tt_unpopulate(bo->bdev, bo->ttm);
+
+					ttm_bo_put(bo);
+					spin_lock(&bdev->lru_lock);
+				}
+			}
+		}
+	}
+	spin_unlock(&bdev->lru_lock);
+}
+EXPORT_SYMBOL(ttm_device_clear_dma_mappings);
diff --git a/include/drm/ttm/ttm_device.h b/include/drm/ttm/ttm_device.h
index 03fb44d061e09..07d722950d5b2 100644
--- a/include/drm/ttm/ttm_device.h
+++ b/include/drm/ttm/ttm_device.h
@@ -299,5 +299,6 @@ int ttm_device_init(struct ttm_device *bdev, struct ttm_device_funcs *funcs,
 		    struct drm_vma_offset_manager *vma_manager,
 		    bool use_dma_alloc, bool use_dma32);
 void ttm_device_fini(struct ttm_device *bdev);
+void ttm_device_clear_dma_mappings(struct ttm_device *bdev);
 
 #endif