top_sg            224 drivers/iommu/virtio-iommu.c 	struct scatterlist top_sg, bottom_sg;
top_sg            225 drivers/iommu/virtio-iommu.c 	struct scatterlist *sg[2] = { &top_sg, &bottom_sg };
top_sg            245 drivers/iommu/virtio-iommu.c 	sg_init_one(&top_sg, req->buf, write_offset);