Greg Kroah-Hartman
598cf27219
Link: https://lore.kernel.org/r/20260217200002.683975158@linuxfoundation.org Tested-by: Florian Fainelli <florian.fainelli@broadcom.com> Tested-by: Takeshi Ogasawara <takeshi.ogasawara@futuring-girl.com> Tested-by: Peter Schneider <pschneider1968@googlemail.com> Tested-by: Jon Hunter <jonathanh@nvidia.com> Tested-by: Salvatore Bonaccorso <carnil@debian.org> Tested-by: Brett A C Sheffield <bacs@librecast.net> Tested-by: Mark Brown <broonie@kernel.org> Tested-by: Luna Jernberg <droidbittin@gmail.com> Tested-by: Ronald Warsow <rwarsow@gmx.de> Tested-by: Justin M. Forbes <jforbes@fedoraproject.org> Tested-by: Ron Economos <re@w6rz.net> Tested-by: Miguel Ojeda <ojeda@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
47 lines
1.8 KiB
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47 lines
1.8 KiB
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StarFive StarLink Performance Monitor Unit (PMU)
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================================================
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StarFive StarLink Performance Monitor Unit (PMU) exists within the
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StarLink Coherent Network on Chip (CNoC) that connects multiple CPU
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clusters with an L3 memory system.
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The uncore PMU supports overflow interrupt, up to 16 programmable 64bit
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event counters, and an independent 64bit cycle counter.
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The PMU can only be accessed via Memory Mapped I/O and are common to the
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cores connected to the same PMU.
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Driver exposes supported PMU events in sysfs "events" directory under::
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/sys/bus/event_source/devices/starfive_starlink_pmu/events/
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Driver exposes cpu used to handle PMU events in sysfs "cpumask" directory
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under::
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/sys/bus/event_source/devices/starfive_starlink_pmu/cpumask/
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Driver describes the format of config (event ID) in sysfs "format" directory
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under::
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/sys/bus/event_source/devices/starfive_starlink_pmu/format/
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Example of perf usage::
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$ perf list
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starfive_starlink_pmu/cycles/ [Kernel PMU event]
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starfive_starlink_pmu/read_hit/ [Kernel PMU event]
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starfive_starlink_pmu/read_miss/ [Kernel PMU event]
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starfive_starlink_pmu/read_request/ [Kernel PMU event]
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starfive_starlink_pmu/release_request/ [Kernel PMU event]
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starfive_starlink_pmu/write_hit/ [Kernel PMU event]
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starfive_starlink_pmu/write_miss/ [Kernel PMU event]
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starfive_starlink_pmu/write_request/ [Kernel PMU event]
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starfive_starlink_pmu/writeback/ [Kernel PMU event]
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$ perf stat -a -e /starfive_starlink_pmu/cycles/ sleep 1
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Sampling is not supported. As a result, "perf record" is not supported.
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Attaching to a task is not supported, only system-wide counting is supported.
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