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Add support for the using the Arm Statistical Profiling Extension (SPE) in
the hardware tracing framework, hwt(4), thread mode.
SPE is an optional extension added in Armv8.1 to provide profiling of
software using randomised instruction sampling. Thread mode allows tracing
of a single thread, regardless of the CPU it is scheduled on.
Reviewed by: andrew
Sponsored by: Arm Ltd
Differential Revision: https://reviews.freebsd.org/D53738
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Fixes: 68f185ccc9f8 ("arm64: Add Arm SPE support")
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Add support for the Arm Statistical Profiling Extension (SPE). This
is an optional extension added in Armv8.1 to provide profiling of
software using randomised instruction sampling.
This adds the initial driver, and attached it to the hardware tracing
framework, hwt(4), in CPU mode to allow tracing of all threads on
a given CPU.
(commit message by andrew@)
Co-authored-by: Sarah Walker <sarah.walker2@arm.com>
Co-authored-by: Andrew Turner <andrew@FreeBSD.org>
Reviewed by: andrew
Sponsored by: Arm Ltd
Sponsored by: The FreeBSD Foundation (early driver)
Differential Revision: https://reviews.freebsd.org/D46241
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