1 // SPDX-License-Identifier: MIT
2 /*
3  * Copyright © 2020 Intel Corporation
4  */
5 
6 #include <asm/msr.h>
7 
8 #include "librapl.h"
9 
10 u64 librapl_energy_uJ(void)
11 {
12 	unsigned long long power;
13 	u32 units;
14 
15 	if (rdmsrl_safe(MSR_RAPL_POWER_UNIT, &power))
16 		return 0;
17 
18 	units = (power & 0x1f00) >> 8;
19 
20 	if (rdmsrl_safe(MSR_PP1_ENERGY_STATUS, &power))
21 		return 0;
22 
23 	return (1000000 * power) >> units; /* convert to uJ */
24 }
25