• Max Filippov's avatar
    xtensa: implement counting and sampling perf events · 9bd46da4
    Max Filippov authored
    Xtensa Performance Monitor Module has up to 8 32 bit wide performance
    counters. Each counter may be enabled independently and can count any
    single type of hardware performance events. Event counting may be enabled
    and disabled globally (per PMM).
    Each counter has status register with bits indicating if the counter has
    been overflown and may be programmed to raise profiling IRQ on overflow.
    This IRQ is used to rewind counters and allow for counting more than 2^32
    samples for counting events and to report samples for sampling events.
    
    For more details see Tensilica Debug User's Guide, chapter 8
    "Performance monitor module".
    
    Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
    Cc: Paul Mackerras <paulus@samba.org>
    Cc: Ingo Molnar <mingo@redhat.com>
    Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
    Signed-off-by: default avatarMax Filippov <jcmvbkbc@gmail.com>
    9bd46da4
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