drivers/gpu/drm/i915/selftests/librapl.c

   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 }