1 /*
2  *  (C) 2011 Thomas Renninger <trenn@suse.de>, Novell Inc.
3  *
4  *  Licensed under the terms of the GNU GPL License version 2.
5  */
6 
7 
8 #include <unistd.h>
9 #include <stdio.h>
10 #include <stdlib.h>
11 #include <errno.h>
12 #include <string.h>
13 #include <getopt.h>
14 
15 #include "helpers/helpers.h"
16 #include "helpers/sysfs.h"
17 #include "helpers/bitmask.h"
18 
19 static struct option set_opts[] = {
20 	{"perf-bias", required_argument, NULL, 'b'},
21 	{ },
22 };
23 
24 static void print_wrong_arg_exit(void)
25 {
26 	printf(_("invalid or unknown argument\n"));
27 	exit(EXIT_FAILURE);
28 }
29 
30 int cmd_set(int argc, char **argv)
31 {
32 	extern char *optarg;
33 	extern int optind, opterr, optopt;
34 	unsigned int cpu;
35 
36 	union {
37 		struct {
38 			int perf_bias:1;
39 		};
40 		int params;
41 	} params;
42 	int perf_bias = 0;
43 	int ret = 0;
44 
45 	setlocale(LC_ALL, "");
46 	textdomain(PACKAGE);
47 
48 	params.params = 0;
49 	/* parameter parsing */
50 	while ((ret = getopt_long(argc, argv, "b:",
51 						set_opts, NULL)) != -1) {
52 		switch (ret) {
53 		case 'b':
54 			if (params.perf_bias)
55 				print_wrong_arg_exit();
56 			perf_bias = atoi(optarg);
57 			if (perf_bias < 0 || perf_bias > 15) {
58 				printf(_("--perf-bias param out "
59 					 "of range [0-%d]\n"), 15);
60 				print_wrong_arg_exit();
61 			}
62 			params.perf_bias = 1;
63 			break;
64 		default:
65 			print_wrong_arg_exit();
66 		}
67 	};
68 
69 	if (!params.params)
70 		print_wrong_arg_exit();
71 
72 	/* Default is: set all CPUs */
73 	if (bitmask_isallclear(cpus_chosen))
74 		bitmask_setall(cpus_chosen);
75 
76 	/* loop over CPUs */
77 	for (cpu = bitmask_first(cpus_chosen);
78 	     cpu <= bitmask_last(cpus_chosen); cpu++) {
79 
80 		if (!bitmask_isbitset(cpus_chosen, cpu))
81 			continue;
82 
83 		if (sysfs_is_cpu_online(cpu) != 1){
84 			fprintf(stderr, _("Cannot set values on CPU %d:"), cpu);
85 			fprintf(stderr, _(" *is offline\n"));
86 			continue;
87 		}
88 
89 		if (params.perf_bias) {
90 			ret = msr_intel_set_perf_bias(cpu, perf_bias);
91 			if (ret) {
92 				fprintf(stderr, _("Error setting perf-bias "
93 						  "value on CPU %d\n"), cpu);
94 				break;
95 			}
96 		}
97 	}
98 	return ret;
99 }
100