diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index 628cbc3ab46f..44ae2c60c9d4 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -974,20 +974,20 @@ static struct ttm_backend_func amdgpu_backend_func = {
 	.destroy = &amdgpu_ttm_backend_destroy,
 };
 
-static struct ttm_tt *amdgpu_ttm_tt_create(struct ttm_bo_device *bdev,
-				    unsigned long size, uint32_t page_flags)
+static struct ttm_tt *amdgpu_ttm_tt_create(struct ttm_buffer_object *bo,
+					   uint32_t page_flags)
 {
 	struct amdgpu_device *adev;
 	struct amdgpu_ttm_tt *gtt;
 
-	adev = amdgpu_ttm_adev(bdev);
+	adev = amdgpu_ttm_adev(bo->bdev);
 
 	gtt = kzalloc(sizeof(struct amdgpu_ttm_tt), GFP_KERNEL);
 	if (gtt == NULL) {
 		return NULL;
 	}
 	gtt->ttm.ttm.func = &amdgpu_backend_func;
-	if (ttm_sg_tt_init(&gtt->ttm, bdev, size, page_flags)) {
+	if (ttm_sg_tt_init(&gtt->ttm, bo, page_flags)) {
 		kfree(gtt);
 		return NULL;
 	}
diff --git a/drivers/gpu/drm/ast/ast_ttm.c b/drivers/gpu/drm/ast/ast_ttm.c
index 211224f6bdd3..fe354ebf374d 100644
--- a/drivers/gpu/drm/ast/ast_ttm.c
+++ b/drivers/gpu/drm/ast/ast_ttm.c
@@ -199,8 +199,8 @@ static struct ttm_backend_func ast_tt_backend_func = {
 };
 
 
-static struct ttm_tt *ast_ttm_tt_create(struct ttm_bo_device *bdev,
-				 unsigned long size, uint32_t page_flags)
+static struct ttm_tt *ast_ttm_tt_create(struct ttm_buffer_object *bo,
+					uint32_t page_flags)
 {
 	struct ttm_tt *tt;
 
@@ -208,7 +208,7 @@ static struct ttm_tt *ast_ttm_tt_create(struct ttm_bo_device *bdev,
 	if (tt == NULL)
 		return NULL;
 	tt->func = &ast_tt_backend_func;
-	if (ttm_tt_init(tt, bdev, size, page_flags)) {
+	if (ttm_tt_init(tt, bo, page_flags)) {
 		kfree(tt);
 		return NULL;
 	}
diff --git a/drivers/gpu/drm/bochs/bochs_mm.c b/drivers/gpu/drm/bochs/bochs_mm.c
index 73722484e12b..50c52b45448f 100644
--- a/drivers/gpu/drm/bochs/bochs_mm.c
+++ b/drivers/gpu/drm/bochs/bochs_mm.c
@@ -176,8 +176,7 @@ static struct ttm_backend_func bochs_tt_backend_func = {
 	.destroy = &bochs_ttm_backend_destroy,
 };
 
-static struct ttm_tt *bochs_ttm_tt_create(struct ttm_bo_device *bdev,
-					  unsigned long size,
+static struct ttm_tt *bochs_ttm_tt_create(struct ttm_buffer_object *bo,
 					  uint32_t page_flags)
 {
 	struct ttm_tt *tt;
@@ -186,7 +185,7 @@ static struct ttm_tt *bochs_ttm_tt_create(struct ttm_bo_device *bdev,
 	if (tt == NULL)
 		return NULL;
 	tt->func = &bochs_tt_backend_func;
-	if (ttm_tt_init(tt, bdev, size, page_flags)) {
+	if (ttm_tt_init(tt, bo, page_flags)) {
 		kfree(tt);
 		return NULL;
 	}
diff --git a/drivers/gpu/drm/cirrus/cirrus_ttm.c b/drivers/gpu/drm/cirrus/cirrus_ttm.c
index 6cd0233b3bf8..f21953243790 100644
--- a/drivers/gpu/drm/cirrus/cirrus_ttm.c
+++ b/drivers/gpu/drm/cirrus/cirrus_ttm.c
@@ -199,8 +199,8 @@ static struct ttm_backend_func cirrus_tt_backend_func = {
 };
 
 
-static struct ttm_tt *cirrus_ttm_tt_create(struct ttm_bo_device *bdev,
-				 unsigned long size, uint32_t page_flags)
+static struct ttm_tt *cirrus_ttm_tt_create(struct ttm_buffer_object *bo,
+					   uint32_t page_flags)
 {
 	struct ttm_tt *tt;
 
@@ -208,7 +208,7 @@ static struct ttm_tt *cirrus_ttm_tt_create(struct ttm_bo_device *bdev,
 	if (tt == NULL)
 		return NULL;
 	tt->func = &cirrus_tt_backend_func;
-	if (ttm_tt_init(tt, bdev, size, page_flags)) {
+	if (ttm_tt_init(tt, bo, page_flags)) {
 		kfree(tt);
 		return NULL;
 	}
diff --git a/drivers/gpu/drm/hisilicon/hibmc/hibmc_ttm.c b/drivers/gpu/drm/hisilicon/hibmc/hibmc_ttm.c
index 8dfffdbb6b07..4871025f7573 100644
--- a/drivers/gpu/drm/hisilicon/hibmc/hibmc_ttm.c
+++ b/drivers/gpu/drm/hisilicon/hibmc/hibmc_ttm.c
@@ -200,8 +200,7 @@ static struct ttm_backend_func hibmc_tt_backend_func = {
 	.destroy = &hibmc_ttm_backend_destroy,
 };
 
-static struct ttm_tt *hibmc_ttm_tt_create(struct ttm_bo_device *bdev,
-					  unsigned long size,
+static struct ttm_tt *hibmc_ttm_tt_create(struct ttm_buffer_object *bo,
 					  u32 page_flags)
 {
 	struct ttm_tt *tt;
@@ -213,7 +212,7 @@ static struct ttm_tt *hibmc_ttm_tt_create(struct ttm_bo_device *bdev,
 		return NULL;
 	}
 	tt->func = &hibmc_tt_backend_func;
-	ret = ttm_tt_init(tt, bdev, size, page_flags);
+	ret = ttm_tt_init(tt, bo, page_flags);
 	if (ret) {
 		DRM_ERROR("failed to initialize ttm_tt: %d\n", ret);
 		kfree(tt);
diff --git a/drivers/gpu/drm/mgag200/mgag200_ttm.c b/drivers/gpu/drm/mgag200/mgag200_ttm.c
index 69beb2046008..05570f0de4d7 100644
--- a/drivers/gpu/drm/mgag200/mgag200_ttm.c
+++ b/drivers/gpu/drm/mgag200/mgag200_ttm.c
@@ -199,8 +199,8 @@ static struct ttm_backend_func mgag200_tt_backend_func = {
 };
 
 
-static struct ttm_tt *mgag200_ttm_tt_create(struct ttm_bo_device *bdev,
-				 unsigned long size, uint32_t page_flags)
+static struct ttm_tt *mgag200_ttm_tt_create(struct ttm_buffer_object *bo,
+					    uint32_t page_flags)
 {
 	struct ttm_tt *tt;
 
@@ -208,7 +208,7 @@ static struct ttm_tt *mgag200_ttm_tt_create(struct ttm_bo_device *bdev,
 	if (tt == NULL)
 		return NULL;
 	tt->func = &mgag200_tt_backend_func;
-	if (ttm_tt_init(tt, bdev, size, page_flags)) {
+	if (ttm_tt_init(tt, bo, page_flags)) {
 		kfree(tt);
 		return NULL;
 	}
diff --git a/drivers/gpu/drm/nouveau/nouveau_bo.c b/drivers/gpu/drm/nouveau/nouveau_bo.c
index 49cc8dfcb141..6f402c4f2bdd 100644
--- a/drivers/gpu/drm/nouveau/nouveau_bo.c
+++ b/drivers/gpu/drm/nouveau/nouveau_bo.c
@@ -604,19 +604,17 @@ nouveau_bo_wr32(struct nouveau_bo *nvbo, unsigned index, u32 val)
 }
 
 static struct ttm_tt *
-nouveau_ttm_tt_create(struct ttm_bo_device *bdev, unsigned long size,
-		      uint32_t page_flags)
+nouveau_ttm_tt_create(struct ttm_buffer_object *bo, uint32_t page_flags)
 {
 #if IS_ENABLED(CONFIG_AGP)
-	struct nouveau_drm *drm = nouveau_bdev(bdev);
+	struct nouveau_drm *drm = nouveau_bdev(bo->bdev);
 
 	if (drm->agp.bridge) {
-		return ttm_agp_tt_create(bdev, drm->agp.bridge, size,
-					 page_flags);
+		return ttm_agp_tt_create(bo, drm->agp.bridge, page_flags);
 	}
 #endif
 
-	return nouveau_sgdma_create_ttm(bdev, size, page_flags);
+	return nouveau_sgdma_create_ttm(bo, page_flags);
 }
 
 static int
diff --git a/drivers/gpu/drm/nouveau/nouveau_sgdma.c b/drivers/gpu/drm/nouveau/nouveau_sgdma.c
index 87b030437f4d..8ebdc74cc0ad 100644
--- a/drivers/gpu/drm/nouveau/nouveau_sgdma.c
+++ b/drivers/gpu/drm/nouveau/nouveau_sgdma.c
@@ -82,10 +82,9 @@ static struct ttm_backend_func nv50_sgdma_backend = {
 };
 
 struct ttm_tt *
-nouveau_sgdma_create_ttm(struct ttm_bo_device *bdev,
-			 unsigned long size, uint32_t page_flags)
+nouveau_sgdma_create_ttm(struct ttm_buffer_object *bo, uint32_t page_flags)
 {
-	struct nouveau_drm *drm = nouveau_bdev(bdev);
+	struct nouveau_drm *drm = nouveau_bdev(bo->bdev);
 	struct nouveau_sgdma_be *nvbe;
 
 	nvbe = kzalloc(sizeof(*nvbe), GFP_KERNEL);
@@ -97,7 +96,7 @@ nouveau_sgdma_create_ttm(struct ttm_bo_device *bdev,
 	else
 		nvbe->ttm.ttm.func = &nv50_sgdma_backend;
 
-	if (ttm_dma_tt_init(&nvbe->ttm, bdev, size, page_flags))
+	if (ttm_dma_tt_init(&nvbe->ttm, bo, page_flags))
 		/*
 		 * A failing ttm_dma_tt_init() will call ttm_tt_destroy()
 		 * and thus our nouveau_sgdma_destroy() hook, so we don't need
diff --git a/drivers/gpu/drm/nouveau/nouveau_ttm.h b/drivers/gpu/drm/nouveau/nouveau_ttm.h
index 64e484ee5ef1..89929ad8c7cd 100644
--- a/drivers/gpu/drm/nouveau/nouveau_ttm.h
+++ b/drivers/gpu/drm/nouveau/nouveau_ttm.h
@@ -12,8 +12,8 @@ extern const struct ttm_mem_type_manager_func nouveau_vram_manager;
 extern const struct ttm_mem_type_manager_func nouveau_gart_manager;
 extern const struct ttm_mem_type_manager_func nv04_gart_manager;
 
-struct ttm_tt *nouveau_sgdma_create_ttm(struct ttm_bo_device *,
-					unsigned long size, u32 page_flags);
+struct ttm_tt *nouveau_sgdma_create_ttm(struct ttm_buffer_object *bo,
+					u32 page_flags);
 
 int  nouveau_ttm_init(struct nouveau_drm *drm);
 void nouveau_ttm_fini(struct nouveau_drm *drm);
diff --git a/drivers/gpu/drm/qxl/qxl_ttm.c b/drivers/gpu/drm/qxl/qxl_ttm.c
index 2ad70eb96207..ee2340e31f06 100644
--- a/drivers/gpu/drm/qxl/qxl_ttm.c
+++ b/drivers/gpu/drm/qxl/qxl_ttm.c
@@ -291,19 +291,19 @@ static struct ttm_backend_func qxl_backend_func = {
 	.destroy = &qxl_ttm_backend_destroy,
 };
 
-static struct ttm_tt *qxl_ttm_tt_create(struct ttm_bo_device *bdev,
-					unsigned long size, uint32_t page_flags)
+static struct ttm_tt *qxl_ttm_tt_create(struct ttm_buffer_object *bo,
+					uint32_t page_flags)
 {
 	struct qxl_device *qdev;
 	struct qxl_ttm_tt *gtt;
 
-	qdev = qxl_get_qdev(bdev);
+	qdev = qxl_get_qdev(bo->bdev);
 	gtt = kzalloc(sizeof(struct qxl_ttm_tt), GFP_KERNEL);
 	if (gtt == NULL)
 		return NULL;
 	gtt->ttm.ttm.func = &qxl_backend_func;
 	gtt->qdev = qdev;
-	if (ttm_dma_tt_init(&gtt->ttm, bdev, size, page_flags)) {
+	if (ttm_dma_tt_init(&gtt->ttm, bo, page_flags)) {
 		kfree(gtt);
 		return NULL;
 	}
diff --git a/drivers/gpu/drm/radeon/radeon_ttm.c b/drivers/gpu/drm/radeon/radeon_ttm.c
index 009f55a2bbf9..8689fcca051c 100644
--- a/drivers/gpu/drm/radeon/radeon_ttm.c
+++ b/drivers/gpu/drm/radeon/radeon_ttm.c
@@ -686,17 +686,17 @@ static struct ttm_backend_func radeon_backend_func = {
 	.destroy = &radeon_ttm_backend_destroy,
 };
 
-static struct ttm_tt *radeon_ttm_tt_create(struct ttm_bo_device *bdev,
-				    unsigned long size, uint32_t page_flags)
+static struct ttm_tt *radeon_ttm_tt_create(struct ttm_buffer_object *bo,
+					   uint32_t page_flags)
 {
 	struct radeon_device *rdev;
 	struct radeon_ttm_tt *gtt;
 
-	rdev = radeon_get_rdev(bdev);
+	rdev = radeon_get_rdev(bo->bdev);
 #if IS_ENABLED(CONFIG_AGP)
 	if (rdev->flags & RADEON_IS_AGP) {
-		return ttm_agp_tt_create(bdev, rdev->ddev->agp->bridge,
-					 size, page_flags);
+		return ttm_agp_tt_create(bo, rdev->ddev->agp->bridge,
+					 page_flags);
 	}
 #endif
 
@@ -706,7 +706,7 @@ static struct ttm_tt *radeon_ttm_tt_create(struct ttm_bo_device *bdev,
 	}
 	gtt->ttm.ttm.func = &radeon_backend_func;
 	gtt->rdev = rdev;
-	if (ttm_dma_tt_init(&gtt->ttm, bdev, size, page_flags)) {
+	if (ttm_dma_tt_init(&gtt->ttm, bo, page_flags)) {
 		kfree(gtt);
 		return NULL;
 	}
diff --git a/drivers/gpu/drm/ttm/ttm_agp_backend.c b/drivers/gpu/drm/ttm/ttm_agp_backend.c
index f7c2aefbec7c..7c2485fe88d8 100644
--- a/drivers/gpu/drm/ttm/ttm_agp_backend.c
+++ b/drivers/gpu/drm/ttm/ttm_agp_backend.c
@@ -110,9 +110,9 @@ static struct ttm_backend_func ttm_agp_func = {
 	.destroy = ttm_agp_destroy,
 };
 
-struct ttm_tt *ttm_agp_tt_create(struct ttm_bo_device *bdev,
+struct ttm_tt *ttm_agp_tt_create(struct ttm_buffer_object *bo,
 				 struct agp_bridge_data *bridge,
-				 unsigned long size, uint32_t page_flags)
+				 uint32_t page_flags)
 {
 	struct ttm_agp_backend *agp_be;
 
@@ -124,7 +124,7 @@ struct ttm_tt *ttm_agp_tt_create(struct ttm_bo_device *bdev,
 	agp_be->bridge = bridge;
 	agp_be->ttm.func = &ttm_agp_func;
 
-	if (ttm_tt_init(&agp_be->ttm, bdev, size, page_flags)) {
+	if (ttm_tt_init(&agp_be->ttm, bo, page_flags)) {
 		kfree(agp_be);
 		return NULL;
 	}
diff --git a/drivers/gpu/drm/ttm/ttm_tt.c b/drivers/gpu/drm/ttm/ttm_tt.c
index 971133106ec2..65976238d24b 100644
--- a/drivers/gpu/drm/ttm/ttm_tt.c
+++ b/drivers/gpu/drm/ttm/ttm_tt.c
@@ -73,8 +73,7 @@ int ttm_tt_create(struct ttm_buffer_object *bo, bool zero_alloc)
 		return -EINVAL;
 	}
 
-	bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
-					      page_flags);
+	bo->ttm = bdev->driver->ttm_tt_create(bo, page_flags);
 	if (unlikely(bo->ttm == NULL))
 		return -ENOMEM;
 
@@ -237,21 +236,21 @@ void ttm_tt_destroy(struct ttm_tt *ttm)
 	ttm->func->destroy(ttm);
 }
 
-void ttm_tt_init_fields(struct ttm_tt *ttm, struct ttm_bo_device *bdev,
-			unsigned long size, uint32_t page_flags)
+void ttm_tt_init_fields(struct ttm_tt *ttm, struct ttm_buffer_object *bo,
+			uint32_t page_flags)
 {
-	ttm->bdev = bdev;
-	ttm->num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
+	ttm->bdev = bo->bdev;
+	ttm->num_pages = bo->num_pages;
 	ttm->caching_state = tt_cached;
 	ttm->page_flags = page_flags;
 	ttm->state = tt_unpopulated;
 	ttm->swap_storage = NULL;
 }
 
-int ttm_tt_init(struct ttm_tt *ttm, struct ttm_bo_device *bdev,
-		unsigned long size, uint32_t page_flags)
+int ttm_tt_init(struct ttm_tt *ttm, struct ttm_buffer_object *bo,
+		uint32_t page_flags)
 {
-	ttm_tt_init_fields(ttm, bdev, size, page_flags);
+	ttm_tt_init_fields(ttm, bo, page_flags);
 
 	if (ttm_tt_alloc_page_directory(ttm)) {
 		ttm_tt_destroy(ttm);
@@ -269,12 +268,12 @@ void ttm_tt_fini(struct ttm_tt *ttm)
 }
 EXPORT_SYMBOL(ttm_tt_fini);
 
-int ttm_dma_tt_init(struct ttm_dma_tt *ttm_dma, struct ttm_bo_device *bdev,
-		    unsigned long size, uint32_t page_flags)
+int ttm_dma_tt_init(struct ttm_dma_tt *ttm_dma, struct ttm_buffer_object *bo,
+		    uint32_t page_flags)
 {
 	struct ttm_tt *ttm = &ttm_dma->ttm;
 
-	ttm_tt_init_fields(ttm, bdev, size, page_flags);
+	ttm_tt_init_fields(ttm, bo, page_flags);
 
 	INIT_LIST_HEAD(&ttm_dma->pages_list);
 	if (ttm_dma_tt_alloc_page_directory(ttm_dma)) {
@@ -286,13 +285,13 @@ int ttm_dma_tt_init(struct ttm_dma_tt *ttm_dma, struct ttm_bo_device *bdev,
 }
 EXPORT_SYMBOL(ttm_dma_tt_init);
 
-int ttm_sg_tt_init(struct ttm_dma_tt *ttm_dma, struct ttm_bo_device *bdev,
-		   unsigned long size, uint32_t page_flags)
+int ttm_sg_tt_init(struct ttm_dma_tt *ttm_dma, struct ttm_buffer_object *bo,
+		   uint32_t page_flags)
 {
 	struct ttm_tt *ttm = &ttm_dma->ttm;
 	int ret;
 
-	ttm_tt_init_fields(ttm, bdev, size, page_flags);
+	ttm_tt_init_fields(ttm, bo, page_flags);
 
 	INIT_LIST_HEAD(&ttm_dma->pages_list);
 	if (page_flags & TTM_PAGE_FLAG_SG)
diff --git a/drivers/gpu/drm/virtio/virtgpu_ttm.c b/drivers/gpu/drm/virtio/virtgpu_ttm.c
index ee9839fbae66..01618afc6bce 100644
--- a/drivers/gpu/drm/virtio/virtgpu_ttm.c
+++ b/drivers/gpu/drm/virtio/virtgpu_ttm.c
@@ -324,20 +324,19 @@ static struct ttm_backend_func virtio_gpu_backend_func = {
 	.destroy = &virtio_gpu_ttm_backend_destroy,
 };
 
-static struct ttm_tt *virtio_gpu_ttm_tt_create(struct ttm_bo_device *bdev,
-					       unsigned long size,
+static struct ttm_tt *virtio_gpu_ttm_tt_create(struct ttm_buffer_object *bo,
 					       uint32_t page_flags)
 {
 	struct virtio_gpu_device *vgdev;
 	struct virtio_gpu_ttm_tt *gtt;
 
-	vgdev = virtio_gpu_get_vgdev(bdev);
+	vgdev = virtio_gpu_get_vgdev(bo->bdev);
 	gtt = kzalloc(sizeof(struct virtio_gpu_ttm_tt), GFP_KERNEL);
 	if (gtt == NULL)
 		return NULL;
 	gtt->ttm.ttm.func = &virtio_gpu_backend_func;
 	gtt->vgdev = vgdev;
-	if (ttm_dma_tt_init(&gtt->ttm, bdev, size, page_flags)) {
+	if (ttm_dma_tt_init(&gtt->ttm, bo, page_flags)) {
 		kfree(gtt);
 		return NULL;
 	}
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_buffer.c b/drivers/gpu/drm/vmwgfx/vmwgfx_buffer.c
index fead3f2dbb46..7177eecb8c9f 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_buffer.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_buffer.c
@@ -693,8 +693,8 @@ static struct ttm_backend_func vmw_ttm_func = {
 	.destroy = vmw_ttm_destroy,
 };
 
-static struct ttm_tt *vmw_ttm_tt_create(struct ttm_bo_device *bdev,
-				 unsigned long size, uint32_t page_flags)
+static struct ttm_tt *vmw_ttm_tt_create(struct ttm_buffer_object *bo,
+					uint32_t page_flags)
 {
 	struct vmw_ttm_tt *vmw_be;
 	int ret;
@@ -704,13 +704,13 @@ static struct ttm_tt *vmw_ttm_tt_create(struct ttm_bo_device *bdev,
 		return NULL;
 
 	vmw_be->dma_ttm.ttm.func = &vmw_ttm_func;
-	vmw_be->dev_priv = container_of(bdev, struct vmw_private, bdev);
+	vmw_be->dev_priv = container_of(bo->bdev, struct vmw_private, bdev);
 	vmw_be->mob = NULL;
 
 	if (vmw_be->dev_priv->map_mode == vmw_dma_alloc_coherent)
-		ret = ttm_dma_tt_init(&vmw_be->dma_ttm, bdev, size, page_flags);
+		ret = ttm_dma_tt_init(&vmw_be->dma_ttm, bo, page_flags);
 	else
-		ret = ttm_tt_init(&vmw_be->dma_ttm.ttm, bdev, size, page_flags);
+		ret = ttm_tt_init(&vmw_be->dma_ttm.ttm, bo, page_flags);
 	if (unlikely(ret != 0))
 		goto out_no_init;
 
diff --git a/drivers/staging/vboxvideo/vbox_ttm.c b/drivers/staging/vboxvideo/vbox_ttm.c
index 2c7daa3d0f24..548edb7c494b 100644
--- a/drivers/staging/vboxvideo/vbox_ttm.c
+++ b/drivers/staging/vboxvideo/vbox_ttm.c
@@ -193,8 +193,7 @@ static struct ttm_backend_func vbox_tt_backend_func = {
 	.destroy = &vbox_ttm_backend_destroy,
 };
 
-static struct ttm_tt *vbox_ttm_tt_create(struct ttm_bo_device *bdev,
-					 unsigned long size,
+static struct ttm_tt *vbox_ttm_tt_create(struct ttm_buffer_object *bo,
 					 u32 page_flags)
 {
 	struct ttm_tt *tt;
@@ -204,7 +203,7 @@ static struct ttm_tt *vbox_ttm_tt_create(struct ttm_bo_device *bdev,
 		return NULL;
 
 	tt->func = &vbox_tt_backend_func;
-	if (ttm_tt_init(tt, bdev, size, page_flags)) {
+	if (ttm_tt_init(tt, bo, page_flags)) {
 		kfree(tt);
 		return NULL;
 	}
diff --git a/include/drm/ttm/ttm_bo_driver.h b/include/drm/ttm/ttm_bo_driver.h
index 39cd6b086d3a..3234cc322e70 100644
--- a/include/drm/ttm/ttm_bo_driver.h
+++ b/include/drm/ttm/ttm_bo_driver.h
@@ -225,8 +225,7 @@ struct ttm_bo_driver {
 	/**
 	 * ttm_tt_create
 	 *
-	 * @bdev: pointer to a struct ttm_bo_device:
-	 * @size: Size of the data needed backing.
+	 * @bo: The buffer object to create the ttm for.
 	 * @page_flags: Page flags as identified by TTM_PAGE_FLAG_XX flags.
 	 *
 	 * Create a struct ttm_tt to back data with system memory pages.
@@ -234,8 +233,7 @@ struct ttm_bo_driver {
 	 * Returns:
 	 * NULL: Out of memory.
 	 */
-	struct ttm_tt *(*ttm_tt_create)(struct ttm_bo_device *bdev,
-					unsigned long size,
+	struct ttm_tt *(*ttm_tt_create)(struct ttm_buffer_object *bo,
 					uint32_t page_flags);
 
 	/**
diff --git a/include/drm/ttm/ttm_tt.h b/include/drm/ttm/ttm_tt.h
index 1cf316a4257c..c0e928abf592 100644
--- a/include/drm/ttm/ttm_tt.h
+++ b/include/drm/ttm/ttm_tt.h
@@ -150,8 +150,7 @@ int ttm_tt_create(struct ttm_buffer_object *bo, bool zero_alloc);
  * ttm_tt_init
  *
  * @ttm: The struct ttm_tt.
- * @bdev: pointer to a struct ttm_bo_device:
- * @size: Size of the data needed backing.
+ * @bo: The buffer object we create the ttm for.
  * @page_flags: Page flags as identified by TTM_PAGE_FLAG_XX flags.
  *
  * Create a struct ttm_tt to back data with system memory pages.
@@ -159,12 +158,12 @@ int ttm_tt_create(struct ttm_buffer_object *bo, bool zero_alloc);
  * Returns:
  * NULL: Out of memory.
  */
-int ttm_tt_init(struct ttm_tt *ttm, struct ttm_bo_device *bdev,
-		unsigned long size, uint32_t page_flags);
-int ttm_dma_tt_init(struct ttm_dma_tt *ttm_dma, struct ttm_bo_device *bdev,
-		    unsigned long size, uint32_t page_flags);
-int ttm_sg_tt_init(struct ttm_dma_tt *ttm_dma, struct ttm_bo_device *bdev,
-		   unsigned long size, uint32_t page_flags);
+int ttm_tt_init(struct ttm_tt *ttm, struct ttm_buffer_object *bo,
+		uint32_t page_flags);
+int ttm_dma_tt_init(struct ttm_dma_tt *ttm_dma, struct ttm_buffer_object *bo,
+		    uint32_t page_flags);
+int ttm_sg_tt_init(struct ttm_dma_tt *ttm_dma, struct ttm_buffer_object *bo,
+		   uint32_t page_flags);
 
 /**
  * ttm_tt_fini
@@ -254,9 +253,8 @@ void ttm_tt_unpopulate(struct ttm_tt *ttm);
 /**
  * ttm_agp_tt_create
  *
- * @bdev: Pointer to a struct ttm_bo_device.
+ * @bo: Buffer object we allocate the ttm for.
  * @bridge: The agp bridge this device is sitting on.
- * @size: Size of the data needed backing.
  * @page_flags: Page flags as identified by TTM_PAGE_FLAG_XX flags.
  *
  *
@@ -264,9 +262,9 @@ void ttm_tt_unpopulate(struct ttm_tt *ttm);
  * for TT memory. This function uses the linux agpgart interface to
  * bind and unbind memory backing a ttm_tt.
  */
-struct ttm_tt *ttm_agp_tt_create(struct ttm_bo_device *bdev,
+struct ttm_tt *ttm_agp_tt_create(struct ttm_buffer_object *bo,
 				 struct agp_bridge_data *bridge,
-				 unsigned long size, uint32_t page_flags);
+				 uint32_t page_flags);
 int ttm_agp_tt_populate(struct ttm_tt *ttm, struct ttm_operation_ctx *ctx);
 void ttm_agp_tt_unpopulate(struct ttm_tt *ttm);
 #endif
