tools/power/cpupower/utils/idle_monitor/nhm_idle.c

Source file repositories/reference/linux-study-clean/tools/power/cpupower/utils/idle_monitor/nhm_idle.c

File Facts

System
Linux kernel
Corpus path
tools/power/cpupower/utils/idle_monitor/nhm_idle.c
Extension
.c
Size
4907 bytes
Lines
216
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0-only
/*
 *  (C) 2010,2011       Thomas Renninger <trenn@suse.de>, Novell Inc.
 *
 *  Based on Len Brown's <lenb@kernel.org> turbostat tool.
 */

#if defined(__i386__) || defined(__x86_64__)

#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>

#include "helpers/helpers.h"
#include "idle_monitor/cpupower-monitor.h"

#define MSR_PKG_C3_RESIDENCY	0x3F8
#define MSR_PKG_C6_RESIDENCY	0x3F9
#define MSR_CORE_C3_RESIDENCY	0x3FC
#define MSR_CORE_C6_RESIDENCY	0x3FD

#define MSR_TSC	0x10

#define NHM_CSTATE_COUNT 4

enum intel_nhm_id { C3 = 0, C6, PC3, PC6, TSC = 0xFFFF };

static int nhm_get_count_percent(unsigned int self_id, double *percent,
				 unsigned int cpu);

static cstate_t nhm_cstates[NHM_CSTATE_COUNT] = {
	{
		.name			= "C3",
		.desc			= N_("Processor Core C3"),
		.id			= C3,
		.range			= RANGE_CORE,
		.get_count_percent	= nhm_get_count_percent,
	},
	{
		.name			= "C6",
		.desc			= N_("Processor Core C6"),
		.id			= C6,
		.range			= RANGE_CORE,
		.get_count_percent	= nhm_get_count_percent,
	},

	{
		.name			= "PC3",
		.desc			= N_("Processor Package C3"),
		.id			= PC3,
		.range			= RANGE_PACKAGE,
		.get_count_percent	= nhm_get_count_percent,
	},
	{
		.name			= "PC6",
		.desc			= N_("Processor Package C6"),
		.id			= PC6,
		.range			= RANGE_PACKAGE,
		.get_count_percent	= nhm_get_count_percent,
	},
};

static unsigned long long tsc_at_measure_start;
static unsigned long long tsc_at_measure_end;
static unsigned long long *previous_count[NHM_CSTATE_COUNT];
static unsigned long long *current_count[NHM_CSTATE_COUNT];
/* valid flag for all CPUs. If a MSR read failed it will be zero */
static int *is_valid;

static int nhm_get_count(enum intel_nhm_id id, unsigned long long *val,
			unsigned int cpu)
{
	int msr;

	switch (id) {
	case C3:
		msr = MSR_CORE_C3_RESIDENCY;
		break;
	case C6:
		msr = MSR_CORE_C6_RESIDENCY;
		break;
	case PC3:
		msr = MSR_PKG_C3_RESIDENCY;
		break;
	case PC6:
		msr = MSR_PKG_C6_RESIDENCY;
		break;
	case TSC:
		msr = MSR_TSC;

Annotation

Implementation Notes