• Stephen Boyd's avatar
    ARM: perf: Add support for Scorpion PMUs · 341e42c4
    Stephen Boyd authored
    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: default avatarStephen Boyd <sboyd@codeaurora.org>
    Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
    341e42c4
pmu.txt 964 Bytes