35 lines · c
1// SPDX-License-Identifier: MIT2/*3 * Copyright © 2020 Intel Corporation4 */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