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
11bool 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
20u64 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