static int get_max_power()

in intel_rapl_common.c [502:537]

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

static int get_max_power(struct powercap_zone *power_zone, int id, u64 *data)
{
	struct rapl_domain *rd;
	u64 val;
	int prim;
	int ret = 0;

	cpus_read_lock();
	rd = power_zone_to_rapl_domain(power_zone);
	switch (rd->rpl[id].prim_id) {
	case PL1_ENABLE:
		prim = THERMAL_SPEC_POWER;
		break;
	case PL2_ENABLE:
		prim = MAX_POWER;
		break;
	case PL4_ENABLE:
		prim = MAX_POWER;
		break;
	default:
		cpus_read_unlock();
		return -EINVAL;
	}
	if (rapl_read_data_raw(rd, prim, true, &val))
		ret = -EIO;
	else
		*data = val;

	/* As a generalization rule, PL4 would be around two times PL2. */
	if (rd->rpl[id].prim_id == PL4_ENABLE)
		*data = *data * 2;

	cpus_read_unlock();

	return ret;
}