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

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/i915/selftests/librapl.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/i915/selftests/librapl.c
Extension
.c
Size
607 bytes
Lines
35
Domain
Driver Families
Bucket
drivers/gpu
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: MIT
/*
 * Copyright © 2020 Intel Corporation
 */

#include <asm/msr.h>

#include "i915_drv.h"
#include "librapl.h"

bool librapl_supported(const struct drm_i915_private *i915)
{
	/* Discrete cards require hwmon integration */
	if (IS_DGFX(i915))
		return false;

	return librapl_energy_uJ();
}

u64 librapl_energy_uJ(void)
{
	unsigned long long power;
	u32 units;

	if (rdmsrq_safe(MSR_RAPL_POWER_UNIT, &power))
		return 0;

	units = (power & 0x1f00) >> 8;

	if (rdmsrq_safe(MSR_PP1_ENERGY_STATUS, &power))
		return 0;

	return (1000000 * power) >> units; /* convert to uJ */
}

Annotation

Implementation Notes