| 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, p: &power)) |
| 26 | return 0; |
| 27 | |
| 28 | units = (power & 0x1f00) >> 8; |
| 29 | |
| 30 | if (rdmsrl_safe(MSR_PP1_ENERGY_STATUS, p: &power)) |
| 31 | return 0; |
| 32 | |
| 33 | return (1000000 * power) >> units; /* convert to uJ */ |
| 34 | } |
| 35 |