• Andrew Bresticker's avatar
    MIPS: Add hook to get C0 performance counter interrupt · a669efc4
    Andrew Bresticker authored
    The hardware perf event driver and oprofile interpret the global
    cp0_perfcount_irq differently: in the hardware perf event driver
    it is an offset from MIPS_CPU_IRQ_BASE and in oprofile it is the
    actual IRQ number.  This still works most of the time since
    MIPS_CPU_IRQ_BASE is usually 0, but is clearly wrong.  Since the
    performance counter interrupt may vary from platform to platform
    like the C0 timer interrupt, add the optional get_c0_perfcount_int
    hook which returns the IRQ number of the performance counter.
    The hook should return < 0 if the performance counter interrupt is
    shared with the timer.  If the hook is not present, the CPU vector
    reported in C0_IntCtl (cp0_perfcount_irq) is used.
    Signed-off-by: default avatarAndrew Bresticker <abrestic@chromium.org>
    Reviewed-by: default avatarQais Yousef <qais.yousef@imgtec.com>
    Tested-by: default avatarQais Yousef <qais.yousef@imgtec.com>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: Jason Cooper <jason@lakedaemon.net>
    Cc: Andrew Bresticker <abrestic@chromium.org>
    Cc: Jeffrey Deans <jeffrey.deans@imgtec.com>
    Cc: Markos Chandras <markos.chandras@imgtec.com>
    Cc: Paul Burton <paul.burton@imgtec.com>
    Cc: Qais Yousef <qais.yousef@imgtec.com>
    Cc: Jonas Gorski <jogo@openwrt.org>
    Cc: John Crispin <blogic@openwrt.org>
    Cc: David Daney <ddaney.cavm@gmail.com>
    Cc: linux-mips@linux-mips.org
    Cc: linux-kernel@vger.kernel.org
    Patchwork: https://patchwork.linux-mips.org/patch/7805/Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
    a669efc4
perf_event_mipsxx.c 43.5 KB