# SPDX-License-Identifier: GPL-2.0-only config STM tristate "System Trace Module devices" select CONFIGFS_FS help A System Trace Module (STM) is a device exporting data in System Trace Protocol (STP) format as defined by MIPI STP standards. Examples of such devices are Intel(R) Trace Hub and Coresight STM. Say Y here to enable System Trace Module device support. if STM config STM_PROTO_BASIC tristate "Basic STM framing protocol driver" default CONFIG_STM help This is a simple framing protocol for sending data over STM devices. This was the protocol that the STM framework used exclusively until the MIPI SyS-T support was added. Use this driver for compatibility with your existing STM setup. The receiving side only needs to be able to decode the MIPI STP protocol in order to extract the data. If you want to be able to use the basic protocol or want the backwards compatibility for your existing setup, say Y. config STM_PROTO_SYS_T tristate "MIPI SyS-T STM framing protocol driver" default CONFIG_STM help This is an implementation of MIPI SyS-T protocol to be used over the STP transport. In addition to the data payload, it also carries additional metadata for time correlation, better means of trace source identification, etc. The receiving side must be able to decode this protocol in addition to the MIPI STP, in order to extract the data. If you don't know what this is, say N. config STM_DUMMY tristate "Dummy STM driver" help This is a simple dummy device that pretends to be an stm device and discards your data. Use for stm class testing. If you don't know what this is, say N. config STM_SOURCE_CONSOLE tristate "Kernel console over STM devices" help This is a kernel space trace source that sends kernel log messages to trace hosts over STM devices. If you want to send kernel console messages over STM devices, say Y. config STM_SOURCE_HEARTBEAT tristate "Heartbeat over STM devices" help This is a kernel space trace source that sends periodic heartbeat messages to trace hosts over STM devices. It is also useful for testing stm class drivers and the stm class framework itself. If you want to send heartbeat messages over STM devices, say Y. config STM_SOURCE_FTRACE tristate "Copy the output from kernel Ftrace to STM engine" depends on TRACING help This option can be used to copy the output from kernel Ftrace to STM engine. Enabling this option will introduce a slight timing effect. If you want to send kernel Ftrace messages over STM devices, say Y. endif