linux/tools/power/cpupower/utils/cpupower-set.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 *  (C) 2011 Thomas Renninger <trenn@suse.de>, Novell Inc.
 */


#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <getopt.h>
#include <sys/utsname.h>

#include "helpers/helpers.h"
#include "helpers/sysfs.h"
#include "helpers/bitmask.h"

static struct option set_opts[] = {
	{"perf-bias", required_argument, NULL, 'b'},
	{ },
};

static void print_wrong_arg_exit(void)
{
	printf(_("invalid or unknown argument\n"));
	exit(EXIT_FAILURE);
}

int cmd_set(int argc, char **argv)
{
	extern char *optarg;
	extern int optind, opterr, optopt;
	unsigned int cpu;
	struct utsname uts;

	union {
		struct {
			int perf_bias:1;
		};
		int params;
	} params;
	int perf_bias = 0;
	int ret = 0;

	ret = uname(&uts);
	if (!ret && (!strcmp(uts.machine, "ppc64le") ||
		     !strcmp(uts.machine, "ppc64"))) {
		fprintf(stderr, _("Subcommand not supported on POWER.\n"));
		return ret;
	}

	setlocale(LC_ALL, "");
	textdomain(PACKAGE);

	params.params = 0;
	/* parameter parsing */
	while ((ret = getopt_long(argc, argv, "b:",
						set_opts, NULL)) != -1) {
		switch (ret) {
		case 'b':
			if (params.perf_bias)
				print_wrong_arg_exit();
			perf_bias = atoi(optarg);
			if (perf_bias < 0 || perf_bias > 15) {
				printf(_("--perf-bias param out "
					 "of range [0-%d]\n"), 15);
				print_wrong_arg_exit();
			}
			params.perf_bias = 1;
			break;
		default:
			print_wrong_arg_exit();
		}
	}

	if (!params.params)
		print_wrong_arg_exit();

	/* Default is: set all CPUs */
	if (bitmask_isallclear(cpus_chosen))
		bitmask_setall(cpus_chosen);

	/* loop over CPUs */
	for (cpu = bitmask_first(cpus_chosen);
	     cpu <= bitmask_last(cpus_chosen); cpu++) {

		if (!bitmask_isbitset(cpus_chosen, cpu))
			continue;

		if (sysfs_is_cpu_online(cpu) != 1){
			fprintf(stderr, _("Cannot set values on CPU %d:"), cpu);
			fprintf(stderr, _(" *is offline\n"));
			continue;
		}

		if (params.perf_bias) {
			ret = msr_intel_set_perf_bias(cpu, perf_bias);
			if (ret) {
				fprintf(stderr, _("Error setting perf-bias "
						  "value on CPU %d\n"), cpu);
				break;
			}
		}
	}
	return ret;
}