path: root/tools/power/x86/turbostat/turbostat.c

/*
 * turbostat -- show CPU frequency and C-state residency
 * on modern Intel turbo-capable processors.
 *
 * Copyright (c) 2010, Intel Corporation.
 * Len Brown <len.brown@intel.com>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <sys/resource.h>
#include <fcntl.h>
#include <signal.h>
#include <sys/time.h>
#include <stdlib.h>
#include <dirent.h>
#include <string.h>
#include <ctype.h>

#define MSR_TSC	0x10
#define MSR_NEHALEM_PLATFORM_INFO	0xCE
#define MSR_NEHALEM_TURBO_RATIO_LIMIT	0x1AD
#define MSR_APERF	0xE8
#define MSR_MPERF	0xE7
#define MSR_PKG_C2_RESIDENCY	0x60D	/* SNB only */
#define MSR_PKG_C3_RESIDENCY	0x3F8
#define MSR_PKG_C6_RESIDENCY	0x3F9
#define MSR_PKG_C7_RESIDENCY	0x3FA	/* SNB only */
#define MSR_CORE_C3_RESIDENCY	0x3FC
#define MSR_CORE_C6_RESIDENCY	0x3FD
#define MSR_CORE_C7_RESIDENCY	0x3FE	/* SNB only */

char *proc_stat = "/proc/stat";
unsigned int interval_sec = 5;	/* set with -i interval_sec */
unsigned int verbose;		/* set with -v */
unsigned int skip_c0;
unsigned int skip_c1;
unsigned int do_nhm_cstates;
unsigned int do_snb_cstates;
unsigned int has_aperf;
unsigned int units = 1000000000;	/* Ghz etc */
unsigned int genuine_intel;
unsigned int has_invariant_tsc;
unsigned int do_nehalem_platform_info;
unsigned int do_nehalem_turbo_ratio_limit;
unsigned int extra_msr_offset;
double bclk;
unsigned int show_pkg;
unsigned int show_core;
unsigned int show_cpu;

int aperf_mperf_unstable;
int backwards_count;
char *progname;
int need_reinitialize;

int num_cpus;

struct counters {
	unsigned long long tsc;		/* per thread */
	unsigned long long aperf;	/* per thread */
	unsigned long long mperf;	/* per thread */
	unsigned long long c1;	/* per thread (calculated) */
	unsigned long long c3;	/* per core */
	unsigned long long c6;	/* per core */
	unsigned long long c7;	/* per core */
	unsigned long long pc2;	/* per package */
	unsigned long long pc3;	/* per package */
	unsigned long long pc6;	/* per package */
	unsigned long long pc7;	/* per package */
	unsigned long long extra_msr;	/* per thread */
	int pkg;
	int core;
	int cpu;
	struct counters *next;
};

struct counters *cnt_even;
struct counters *cnt_odd;
struct counters *cnt_delta;
struct counters *cnt_average;
struct timeval tv_even;
struct timeval tv_odd;
struct timeval tv_delta;

unsigned long long get_msr(int cpu, off_t offset)
{
	ssize_t retval;
	unsigned long long msr;
	char pathname[32];
	int fd;

	sprintf(pathname, "/dev/cpu/%d/msr", cpu);
	fd = open(pathname, O_RDONLY);
	if (fd < 0) {
		perror(pathname);
		need_reinitialize = 1;
		return 0;
	}

	retval = pread(fd, &msr, sizeof msr, offset);
	if (retval != sizeof msr) {
		fprintf(stderr, "cpu%d pread(..., 0x%zx) = %jd\n",
			cpu, offset, retval);
		exit(-2);
	}

	close(fd);
	return msr;
}

void print_header(void)
{
	if (show_pkg)
		fprintf(stderr, "pkg ");
	if (show_core)
		fprintf(stderr, "core");
	if (show_cpu)
		fprintf(stderr, " CPU");
	if (do_nhm_cstates)
		fprintf(stderr, "   %%c0 ");
	if (has_aperf)
		fprintf(stderr, "  GHz");
	fprintf(stderr, "  TSC");
	if (do_nhm_cstates)
		fprintf(stderr, "   %%c1 ");
	if (do_nhm_cstates)
		fprintf(stderr, "   %%c3 ");
	if (do_nhm_cstates)
		fprintf(stderr, "   %%c6 ");
	if (do_snb_cstates)
		fprintf(stderr,