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 14 #include "helpers/helpers.h" 15 #include "helpers/sysfs.h" 16 #include "helpers/bitmask.h" 17 18 static struct option set_opts[] = { 19 {"perf-bias", required_argument, NULL, 'b'}, 20 { }, 21 }; 22 23 static void print_wrong_arg_exit(void) 24 { 25 printf(_("invalid or unknown argument\n")); 26 exit(EXIT_FAILURE); 27 } 28 29 int cmd_set(int argc, char **argv) 30 { 31 extern char *optarg; 32 extern int optind, opterr, optopt; 33 unsigned int cpu; 34 35 union { 36 struct { 37 int perf_bias:1; 38 }; 39 int params; 40 } params; 41 int perf_bias = 0; 42 int ret = 0; 43 44 setlocale(LC_ALL, ""); 45 textdomain(PACKAGE); 46 47 params.params = 0; 48 /* parameter parsing */ 49 while ((ret = getopt_long(argc, argv, "b:", 50 set_opts, NULL)) != -1) { 51 switch (ret) { 52 case 'b': 53 if (params.perf_bias) 54 print_wrong_arg_exit(); 55 perf_bias = atoi(optarg); 56 if (perf_bias < 0 || perf_bias > 15) { 57 printf(_("--perf-bias param out " 58 "of range [0-%d]\n"), 15); 59 print_wrong_arg_exit(); 60 } 61 params.perf_bias = 1; 62 break; 63 default: 64 print_wrong_arg_exit(); 65 } 66 }; 67 68 if (!params.params) 69 print_wrong_arg_exit(); 70 71 /* Default is: set all CPUs */ 72 if (bitmask_isallclear(cpus_chosen)) 73 bitmask_setall(cpus_chosen); 74 75 /* loop over CPUs */ 76 for (cpu = bitmask_first(cpus_chosen); 77 cpu <= bitmask_last(cpus_chosen); cpu++) { 78 79 if (!bitmask_isbitset(cpus_chosen, cpu)) 80 continue; 81 82 if (sysfs_is_cpu_online(cpu) != 1){ 83 fprintf(stderr, _("Cannot set values on CPU %d:"), cpu); 84 fprintf(stderr, _(" *is offline\n")); 85 continue; 86 } 87 88 if (params.perf_bias) { 89 ret = msr_intel_set_perf_bias(cpu, perf_bias); 90 if (ret) { 91 fprintf(stderr, _("Error setting perf-bias " 92 "value on CPU %d\n"), cpu); 93 break; 94 } 95 } 96 } 97 return ret; 98 } 99