NHMEX_R_PMON_CTL_EV_SEL_SHIFT
NHMEX_R_PMON_CTL_EV_SEL_SHIFT;
(0x1f << NHMEX_R_PMON_CTL_EV_SEL_SHIFT)
hwc->config -= 1 << NHMEX_R_PMON_CTL_EV_SEL_SHIFT;
hwc->config += 1 << NHMEX_R_PMON_CTL_EV_SEL_SHIFT;