diff options
Diffstat (limited to 'tools/power/cpupower/utils/cpupower-set.c')
| -rw-r--r-- | tools/power/cpupower/utils/cpupower-set.c | 153 |
1 files changed, 153 insertions, 0 deletions
diff --git a/tools/power/cpupower/utils/cpupower-set.c b/tools/power/cpupower/utils/cpupower-set.c new file mode 100644 index 00000000000..bc1b391e46f --- /dev/null +++ b/tools/power/cpupower/utils/cpupower-set.c @@ -0,0 +1,153 @@ +/* + * (C) 2011 Thomas Renninger <trenn@suse.de>, Novell Inc. + * + * Licensed under the terms of the GNU GPL License version 2. + */ + + +#include <unistd.h> +#include <stdio.h> +#include <stdlib.h> +#include <errno.h> +#include <string.h> +#include <getopt.h> + +#include <cpufreq.h> +#include "helpers/helpers.h" +#include "helpers/sysfs.h" +#include "helpers/bitmask.h" + +void set_help(void) +{ + printf(_("Usage: cpupower set [ -b val ] [ -m val ] [ -s val ]\n")); + printf(_("Options:\n")); + printf(_(" -b, --perf-bias [VAL] Sets CPU's power vs performance policy on some\n" + " Intel models [0-15], see manpage for details\n")); + printf(_(" -m, --sched-mc [VAL] Sets the kernel's multi core scheduler policy.\n")); + printf(_(" -s, --sched-smt [VAL] Sets the kernel's thread sibling scheduler policy.\n")); + printf(_(" -h, --help Prints out this screen\n")); + printf("\n"); +} + +static struct option set_opts[] = { + { .name = "perf-bias", .has_arg = optional_argument, .flag = NULL, .val = 'b'}, + { .name = "sched-mc", .has_arg = optional_argument, .flag = NULL, .val = 'm'}, + { .name = "sched-smt", .has_arg = optional_argument, .flag = NULL, .val = 's'}, + { .name = "help", .has_arg = no_argument, .flag = NULL, .val = 'h'}, + { }, +}; + +static void print_wrong_arg_exit(void) +{ + printf(_("invalid or unknown argument\n")); + set_help(); + exit(EXIT_FAILURE); +} + +int cmd_set(int argc, char **argv) +{ + extern char *optarg; + extern int optind, opterr, optopt; + unsigned int cpu; + + union { + struct { + int sched_mc:1; + int sched_smt:1; + int perf_bias:1; + }; + int params; + } params; + int sched_mc = 0, sched_smt = 0, perf_bias = 0; + int ret = 0; + + setlocale(LC_ALL, ""); + textdomain(PACKAGE); + + params.params = 0; + /* parameter parsing */ + while ((ret = getopt_long(argc, argv, "m:s:b:h", + set_opts, NULL)) != -1) { + switch (ret) { + case 'h': + set_help(); + return 0; + 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; + case 'm': + if (params.sched_mc) + print_wrong_arg_exit(); + sched_mc = atoi(optarg); + if (sched_mc < 0 || sched_mc > 2) { + printf(_("--sched-mc param out " + "of range [0-%d]\n"), 2); + print_wrong_arg_exit(); + } + params.sched_mc = 1; + break; + case 's': + if (params.sched_smt) + print_wrong_arg_exit(); + sched_smt = atoi(optarg); + if (sched_smt < 0 || sched_smt > 2) { + printf(_("--sched-smt param out " + "of range [0-%d]\n"), 2); + print_wrong_arg_exit(); + } + params.sched_smt = 1; + break; + default: + print_wrong_arg_exit(); + } + }; + + if (!params.params) { + set_help(); + return -EINVAL; + } + + if (params.sched_mc) { + ret = sysfs_set_sched("mc", sched_mc); + if (ret) + fprintf(stderr, _("Error setting sched-mc %s\n"), + (ret == -ENODEV) ? "not supported" : ""); + } + if (params.sched_smt) { + ret = sysfs_set_sched("smt", sched_smt); + if (ret) + fprintf(stderr, _("Error setting sched-smt %s\n"), + (ret == -ENODEV) ? "not supported" : ""); + } + + /* 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) || + cpufreq_cpu_exists(cpu)) + 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; +} |