cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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cpupower-info.c (2363B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 *  (C) 2011 Thomas Renninger <trenn@suse.de>, Novell Inc.
      4 */
      5
      6
      7#include <unistd.h>
      8#include <stdio.h>
      9#include <stdlib.h>
     10#include <errno.h>
     11#include <string.h>
     12#include <getopt.h>
     13#include <sys/utsname.h>
     14
     15#include "helpers/helpers.h"
     16#include "helpers/sysfs.h"
     17
     18static struct option set_opts[] = {
     19     {"perf-bias", optional_argument, NULL, 'b'},
     20     { },
     21};
     22
     23static void print_wrong_arg_exit(void)
     24{
     25	printf(_("invalid or unknown argument\n"));
     26	exit(EXIT_FAILURE);
     27}
     28
     29int cmd_info(int argc, char **argv)
     30{
     31	extern char *optarg;
     32	extern int optind, opterr, optopt;
     33	unsigned int cpu;
     34	struct utsname uts;
     35
     36	union {
     37		struct {
     38			int perf_bias:1;
     39		};
     40		int params;
     41	} params = {};
     42	int ret = 0;
     43
     44	ret = uname(&uts);
     45	if (!ret && (!strcmp(uts.machine, "ppc64le") ||
     46		     !strcmp(uts.machine, "ppc64"))) {
     47		fprintf(stderr, _("Subcommand not supported on POWER.\n"));
     48		return ret;
     49	}
     50
     51	setlocale(LC_ALL, "");
     52	textdomain(PACKAGE);
     53
     54	/* parameter parsing */
     55	while ((ret = getopt_long(argc, argv, "b", set_opts, NULL)) != -1) {
     56		switch (ret) {
     57		case 'b':
     58			if (params.perf_bias)
     59				print_wrong_arg_exit();
     60			params.perf_bias = 1;
     61			break;
     62		default:
     63			print_wrong_arg_exit();
     64		}
     65	}
     66
     67	if (!params.params)
     68		params.params = 0x7;
     69
     70	/* Default is: show output of CPU 0 only */
     71	if (bitmask_isallclear(cpus_chosen))
     72		bitmask_setbit(cpus_chosen, 0);
     73
     74	/* Add more per cpu options here */
     75	if (!params.perf_bias)
     76		return ret;
     77
     78	if (params.perf_bias) {
     79		if (!run_as_root) {
     80			params.perf_bias = 0;
     81			printf(_("Intel's performance bias setting needs root privileges\n"));
     82		} else if (!(cpupower_cpu_info.caps & CPUPOWER_CAP_PERF_BIAS)) {
     83			printf(_("System does not support Intel's performance"
     84				 " bias setting\n"));
     85			params.perf_bias = 0;
     86		}
     87	}
     88
     89	/* loop over CPUs */
     90	for (cpu = bitmask_first(cpus_chosen);
     91	     cpu <= bitmask_last(cpus_chosen); cpu++) {
     92
     93		if (!bitmask_isbitset(cpus_chosen, cpu))
     94			continue;
     95
     96		printf(_("analyzing CPU %d:\n"), cpu);
     97
     98		if (sysfs_is_cpu_online(cpu) != 1){
     99			printf(_(" *is offline\n"));
    100			continue;
    101		}
    102
    103		if (params.perf_bias) {
    104			ret = cpupower_intel_get_perf_bias(cpu);
    105			if (ret < 0) {
    106				fprintf(stderr,
    107			_("Could not read perf-bias value[%d]\n"), ret);
    108				exit(EXIT_FAILURE);
    109			} else
    110				printf(_("perf-bias: %d\n"), ret);
    111		}
    112	}
    113	return 0;
    114}