static int set_power_limit()

in intel_rapl_common.c [327:370]

• 40 lines of code
• 7 McCabe index (conditional complexity)

static int set_power_limit(struct powercap_zone *power_zone, int cid,
			   u64 power_limit)
{
	struct rapl_domain *rd;
	struct rapl_package *rp;
	int ret = 0;
	int id;

	cpus_read_lock();
	rd = power_zone_to_rapl_domain(power_zone);
	id = contraint_to_pl(rd, cid);
	if (id < 0) {
		ret = id;
		goto set_exit;
	}

	rp = rd->rp;

	if (rd->state & DOMAIN_STATE_BIOS_LOCKED) {
		dev_warn(&power_zone->dev,
			 "%s locked by BIOS, monitoring only\n", rd->name);
		ret = -EACCES;
		goto set_exit;
	}

	switch (rd->rpl[id].prim_id) {
	case PL1_ENABLE:
		rapl_write_data_raw(rd, POWER_LIMIT1, power_limit);
		break;
	case PL2_ENABLE:
		rapl_write_data_raw(rd, POWER_LIMIT2, power_limit);
		break;
	case PL4_ENABLE:
		rapl_write_data_raw(rd, POWER_LIMIT4, power_limit);
		break;
	default:
		ret = -EINVAL;
	}
	if (!ret)
		package_power_limit_irq_save(rp);
set_exit:
	cpus_read_unlock();
	return ret;
}