static int xtensa_pmu_event_init()

in kernel/perf_event.c [198:233]

• 31 lines of code
• 8 McCabe index (conditional complexity)

static int xtensa_pmu_event_init(struct perf_event *event)
{
	int ret;

	switch (event->attr.type) {
	case PERF_TYPE_HARDWARE:
		if (event->attr.config >= ARRAY_SIZE(xtensa_hw_ctl) ||
		    xtensa_hw_ctl[event->attr.config] == 0)
			return -EINVAL;
		event->hw.config = xtensa_hw_ctl[event->attr.config];
		return 0;

	case PERF_TYPE_HW_CACHE:
		ret = xtensa_pmu_cache_event(event->attr.config);
		if (ret < 0)
			return ret;
		event->hw.config = ret;
		return 0;

	case PERF_TYPE_RAW:
		/* Not 'previous counter' select */
		if ((event->attr.config & XTENSA_PMU_PMCTRL_SELECT) ==
		    (1 << XTENSA_PMU_PMCTRL_SELECT_SHIFT))
			return -EINVAL;
		event->hw.config = (event->attr.config &
				    (XTENSA_PMU_PMCTRL_KRNLCNT |
				     XTENSA_PMU_PMCTRL_TRACELEVEL |
				     XTENSA_PMU_PMCTRL_SELECT |
				     XTENSA_PMU_PMCTRL_MASK)) |
			XTENSA_PMU_PMCTRL_INTEN;
		return 0;

	default:
		return -ENOENT;
	}
}