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 "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 }