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