config UACCE tristate "Accelerator Framework for User Land" depends on IOMMU_API help UACCE provides interface for the user process to access the hardware without interaction with the kernel space in data path. The user-space interface is described in include/uapi/misc/uacce/uacce.h See Documentation/misc-devices/uacce.rst for more details. If you don't know what to do here, say N.