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 #include "helpers/bitmask.h"
18 
19 static struct option set_opts[] = {
20 	{"perf-bias", required_argument, NULL, 'b'},
21 	{ },
22 };
23 
print_wrong_arg_exit(void)24 static void print_wrong_arg_exit(void)
25 {
26 	printf(_("invalid or unknown argument\n"));
27 	exit(EXIT_FAILURE);
28 }
29 
cmd_set(int argc,char ** argv)30 int cmd_set(int argc, char **argv)
31 {
32 	extern char *optarg;
33 	extern int optind, opterr, optopt;
34 	unsigned int cpu;
35 	struct utsname uts;
36 
37 	union {
38 		struct {
39 			int perf_bias:1;
40 		};
41 		int params;
42 	} params;
43 	int perf_bias = 0;
44 	int ret = 0;
45 
46 	ret = uname(&uts);
47 	if (!ret && (!strcmp(uts.machine, "ppc64le") ||
48 		     !strcmp(uts.machine, "ppc64"))) {
49 		fprintf(stderr, _("Subcommand not supported on POWER.\n"));
50 		return ret;
51 	}
52 
53 	setlocale(LC_ALL, "");
54 	textdomain(PACKAGE);
55 
56 	params.params = 0;
57 	/* parameter parsing */
58 	while ((ret = getopt_long(argc, argv, "b:",
59 						set_opts, NULL)) != -1) {
60 		switch (ret) {
61 		case 'b':
62 			if (params.perf_bias)
63 				print_wrong_arg_exit();
64 			perf_bias = atoi(optarg);
65 			if (perf_bias < 0 || perf_bias > 15) {
66 				printf(_("--perf-bias param out "
67 					 "of range [0-%d]\n"), 15);
68 				print_wrong_arg_exit();
69 			}
70 			params.perf_bias = 1;
71 			break;
72 		default:
73 			print_wrong_arg_exit();
74 		}
75 	}
76 
77 	if (!params.params)
78 		print_wrong_arg_exit();
79 
80 	/* Default is: set all CPUs */
81 	if (bitmask_isallclear(cpus_chosen))
82 		bitmask_setall(cpus_chosen);
83 
84 	/* loop over CPUs */
85 	for (cpu = bitmask_first(cpus_chosen);
86 	     cpu <= bitmask_last(cpus_chosen); cpu++) {
87 
88 		if (!bitmask_isbitset(cpus_chosen, cpu))
89 			continue;
90 
91 		if (sysfs_is_cpu_online(cpu) != 1){
92 			fprintf(stderr, _("Cannot set values on CPU %d:"), cpu);
93 			fprintf(stderr, _(" *is offline\n"));
94 			continue;
95 		}
96 
97 		if (params.perf_bias) {
98 			ret = cpupower_intel_set_perf_bias(cpu, perf_bias);
99 			if (ret) {
100 				fprintf(stderr, _("Error setting perf-bias "
101 						  "value on CPU %d\n"), cpu);
102 				break;
103 			}
104 		}
105 	}
106 	return ret;
107 }
108