static int rapl_check_unit_atom()

in intel_rapl_common.c [858:884]

• 21 lines of code
• 2 McCabe index (conditional complexity)

static int rapl_check_unit_atom(struct rapl_package *rp, int cpu)
{
	struct reg_action ra;
	u32 value;

	ra.reg = rp->priv->reg_unit;
	ra.mask = ~0;
	if (rp->priv->read_raw(cpu, &ra)) {
		pr_err("Failed to read power unit REG 0x%llx on CPU %d, exit.\n",
		       rp->priv->reg_unit, cpu);
		return -ENODEV;
	}

	value = (ra.value & ENERGY_UNIT_MASK) >> ENERGY_UNIT_OFFSET;
	rp->energy_unit = ENERGY_UNIT_SCALE * 1 << value;

	value = (ra.value & POWER_UNIT_MASK) >> POWER_UNIT_OFFSET;
	rp->power_unit = (1 << value) * 1000;

	value = (ra.value & TIME_UNIT_MASK) >> TIME_UNIT_OFFSET;
	rp->time_unit = 1000000 / (1 << value);

	pr_debug("Atom %s energy=%dpJ, time=%dus, power=%duW\n",
		 rp->name, rp->energy_unit, rp->time_unit, rp->power_unit);

	return 0;
}