1 ================================================ 2 StarFive StarLink Performance Monitor Unit (PMU) 3 ================================================ 4 5 StarFive StarLink Performance Monitor Unit (PMU) exists within the 6 StarLink Coherent Network on Chip (CNoC) that connects multiple CPU 7 clusters with an L3 memory system. 8 9 The uncore PMU supports overflow interrupt, up to 16 programmable 64bit 10 event counters, and an independent 64bit cycle counter. 11 The PMU can only be accessed via Memory Mapped I/O and are common to the 12 cores connected to the same PMU. 13 14 Driver exposes supported PMU events in sysfs "events" directory under:: 15 16 /sys/bus/event_source/devices/starfive_starlink_pmu/events/ 17 18 Driver exposes cpu used to handle PMU events in sysfs "cpumask" directory 19 under:: 20 21 /sys/bus/event_source/devices/starfive_starlink_pmu/cpumask/ 22 23 Driver describes the format of config (event ID) in sysfs "format" directory 24 under:: 25 26 /sys/bus/event_source/devices/starfive_starlink_pmu/format/ 27 28 Example of perf usage:: 29 30 $ perf list 31 32 starfive_starlink_pmu/cycles/ [Kernel PMU event] 33 starfive_starlink_pmu/read_hit/ [Kernel PMU event] 34 starfive_starlink_pmu/read_miss/ [Kernel PMU event] 35 starfive_starlink_pmu/read_request/ [Kernel PMU event] 36 starfive_starlink_pmu/release_request/ [Kernel PMU event] 37 starfive_starlink_pmu/write_hit/ [Kernel PMU event] 38 starfive_starlink_pmu/write_miss/ [Kernel PMU event] 39 starfive_starlink_pmu/write_request/ [Kernel PMU event] 40 starfive_starlink_pmu/writeback/ [Kernel PMU event] 41 42 43 $ perf stat -a -e /starfive_starlink_pmu/cycles/ sleep 1 44 45 Sampling is not supported. As a result, "perf record" is not supported. 46 Attaching to a task is not supported, only system-wide counting is supported.
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