cpupower: Introduce idle-set subcommand and C-state enabling/disabling

Example:

cpupower idle-set -d 3

will disable C-state 3 on all processors (set commands are active on
all CPUs by default), same as:

cpupower -c all idle-set -d 3

Signed-off-by: Thomas Renninger <trenn@suse.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 118 insertions, 0 deletions

diff --git a/tools/power/cpupower/utils/cpuidle-set.c b/tools/power/cpupower/utils/cpuidle-set.c
new file mode 100644
index 000000000000..c78141c5dfac
--- /dev/null
+++ b/tools/power/cpupower/utils/cpuidle-set.c
@@ -0,0 +1,118 @@
+#include <unistd.h>
+#include <stdio.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <limits.h>
+#include <string.h>
+#include <ctype.h>
+
+#include <getopt.h>
+
+#include "cpufreq.h"
+#include "helpers/helpers.h"
+#include "helpers/sysfs.h"
+
+static struct option info_opts[] = {
+	{ .name = "disable",	.has_arg = required_argument,	.flag = NULL,	.val = 'd'},
+	{ .name = "enable",	.has_arg = required_argument,	.flag = NULL,	.val = 'e'},
+	{ },
+};
+
+
+int cmd_idle_set(int argc, char **argv)
+{
+	extern char *optarg;
+	extern int optind, opterr, optopt;
+	int ret = 0, cont = 1, param = 0, idlestate = 0;
+	unsigned int cpu = 0;
+
+	do {
+		ret = getopt_long(argc, argv, "d:e:", info_opts, NULL);
+		if (ret == -1)
+			break;
+		switch (ret) {
+		case '?':
+			param = '?';
+			cont = 0;
+			break;
+		case 'd':
+			if (param) {
+				param = -1;
+				cont = 0;
+				break;
+			}
+			param = ret;
+			idlestate = atoi(optarg);
+			break;
+		case 'e':
+			if (param) {
+				param = -1;
+				cont = 0;
+				break;
+			}
+			param = ret;
+			idlestate = atoi(optarg);
+			break;
+		case -1:
+			cont = 0;
+			break;
+		}
+	} while (cont);
+
+	switch (param) {
+	case -1:
+		printf(_("You can't specify more than one "
+			 "output-specific argument\n"));
+		exit(EXIT_FAILURE);
+	case '?':
+		printf(_("invalid or unknown argument\n"));
+		exit(EXIT_FAILURE);
+	}
+
+	/* Default is: set all CPUs */
+	if (bitmask_isallclear(cpus_chosen))
+		bitmask_setall(cpus_chosen);
+
+	for (cpu = bitmask_first(cpus_chosen);
+	     cpu <= bitmask_last(cpus_chosen); cpu++) {
+
+		if (!bitmask_isbitset(cpus_chosen, cpu))
+			continue;
+
+		switch (param) {
+
+		case 'd':
+			ret = sysfs_idlestate_disable(cpu, idlestate, 1);
+			if (ret == 0)
+		printf(_("Idlestate %u disabled on CPU %u\n"),  idlestate, cpu);
+			else if (ret == -1)
+		printf(_("Idlestate %u not available on CPU %u\n"),
+		       idlestate, cpu);
+			else if (ret == -2)
+		printf(_("Idlestate disabling not supported by kernel\n"));
+			else
+		printf(_("Idlestate %u not disabled on CPU %u\n"),
+		       idlestate, cpu);
+			break;
+		case 'e':
+			ret = sysfs_idlestate_disable(cpu, idlestate, 0);
+			if (ret == 0)
+		printf(_("Idlestate %u enabled on CPU %u\n"),  idlestate, cpu);
+			else if (ret == -1)
+		printf(_("Idlestate %u not available on CPU %u\n"),
+		       idlestate, cpu);
+			else if (ret == -2)
+		printf(_("Idlestate enabling not supported by kernel\n"));
+			else
+		printf(_("Idlestate %u not enabled on CPU %u\n"),
+		       idlestate, cpu);
+			break;
+		default:
+			/* Not reachable with proper args checking */
+			printf(_("Invalid or unknown argument\n"));
+			exit(EXIT_FAILURE);
+			break;
+		}
+	}
+	return EXIT_SUCCESS;
+}