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Scorpion supports a set of local performance monitor event selection registers (LPM) sitting behind a cp15 based interface that extend the architected PMU events to include Scorpion CPU and Venum VFP specific events. To use these events the user is expected to program the lpm register with the event code shifted into the group they care about and then point the PMNx event at that region+group combo by writing a LPMn_GROUPx event. Add support for this hardware. Note: the raw event number is a pure software construct that allows us to map the multi-dimensional number space of regions, groups, and event codes into a flat event number space suitable for use by the perf framework. This is based on code originally written by Sheetal Sahasrabudhe, Ashwin Chaugule, and Neil Leeder [1]. [1] https://www.codeaurora.org/cgit/quic/la/kernel/msm/tree/arch/arm/kernel/perf_event_msm.c?h=msm-3.4 Cc: Mark Rutland <mark.rutland@arm.com> Cc: Neil Leeder <nleeder@codeaurora.org> Cc: Ashwin Chaugule <ashwinc@codeaurora.org> Cc: Sheetal Sahasrabudhe <sheetals@codeaurora.org> Cc: <devicetree@vger.kernel.org> Signed-off-by: Stephen Boyd <sboyd@codeaurora.org> Signed-off-by: Will Deacon <will.deacon@arm.com> |
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