1 // SPDX-License-Identifier: MIT
2 /*
3  * Copyright © 2020 Intel Corporation
4  */
5 
6 #include <asm/msr.h>
7 
8 #include "i915_drv.h"
9 #include "librapl.h"
10 
11 bool librapl_supported(const struct drm_i915_private *i915)
12 {
13 	/* Discrete cards require hwmon integration */
14 	if (IS_DGFX(i915))
15 		return false;
16 
17 	return librapl_energy_uJ();
18 }
19 
20 u64 librapl_energy_uJ(void)
21 {
22 	unsigned long long power;
23 	u32 units;
24 
25 	if (rdmsrl_safe(MSR_RAPL_POWER_UNIT, &power))
26 		return 0;
27 
28 	units = (power & 0x1f00) >> 8;
29 
30 	if (rdmsrl_safe(MSR_PP1_ENERGY_STATUS, &power))
31 		return 0;
32 
33 	return (1000000 * power) >> units; /* convert to uJ */
34 }
35