static int csky_pmu_event_init()

in kernel/perf_event.c [968:1007]

• 36 lines of code
• 10 McCabe index (conditional complexity)

static int csky_pmu_event_init(struct perf_event *event)
{
	struct hw_perf_event *hwc = &event->hw;
	int ret;

	switch (event->attr.type) {
	case PERF_TYPE_HARDWARE:
		if (event->attr.config >= PERF_COUNT_HW_MAX)
			return -ENOENT;
		ret = csky_pmu_hw_map[event->attr.config];
		if (ret == HW_OP_UNSUPPORTED)
			return -ENOENT;
		hwc->idx = ret;
		break;
	case PERF_TYPE_HW_CACHE:
		ret = csky_pmu_cache_event(event->attr.config);
		if (ret == CACHE_OP_UNSUPPORTED)
			return -ENOENT;
		hwc->idx = ret;
		break;
	case PERF_TYPE_RAW:
		if (hw_raw_read_mapping[event->attr.config] == NULL)
			return -ENOENT;
		hwc->idx = event->attr.config;
		break;
	default:
		return -ENOENT;
	}

	if (event->attr.exclude_user)
		csky_pmu.hpcr = BIT(2);
	else if (event->attr.exclude_kernel)
		csky_pmu.hpcr = BIT(3);
	else
		csky_pmu.hpcr = BIT(2) | BIT(3);

	csky_pmu.hpcr |= BIT(1) | BIT(0);

	return 0;
}