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262e1f6e39
This patch adds a driver that models itself as an stm_source called stm_ftrace. Once the stm device and stm_ftrace have been linked via sysfs, the driver registers itself as a trace_export and everything passed to the interface from Ftrace subsystem will end up in the STM trace engine. Link: http://lkml.kernel.org/r/1479715043-6534-3-git-send-email-zhang.chunyan@linaro.org Signed-off-by: Chunyan Zhang <zhang.chunyan@linaro.org> Acked-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
54 lines
1.5 KiB
Plaintext
54 lines
1.5 KiB
Plaintext
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_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 FUNCTION_TRACER
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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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