Merge branch 'master' into for-next

Fast-forward merge with Linus to be able to merge patches
based on more recent version of the tree.

1 files changed, 331 insertions, 0 deletions

diff --git a/tools/power/cpupower/utils/cpufreq-set.c b/tools/power/cpupower/utils/cpufreq-set.c
new file mode 100644
index 000000000000..dd1539eb8c63
--- /dev/null
+++ b/tools/power/cpupower/utils/cpufreq-set.c
@@ -0,0 +1,331 @@
+/*
+ *  (C) 2004-2009  Dominik Brodowski <linux@dominikbrodowski.de>
+ *
+ *  Licensed under the terms of the GNU GPL License version 2.
+ */
+
+
+#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"
+
+#define NORM_FREQ_LEN 32
+
+static struct option set_opts[] = {
+	{ .name = "min",	.has_arg = required_argument,	.flag = NULL,	.val = 'd'},
+	{ .name = "max",	.has_arg = required_argument,	.flag = NULL,	.val = 'u'},
+	{ .name = "governor",	.has_arg = required_argument,	.flag = NULL,	.val = 'g'},
+	{ .name = "freq",	.has_arg = required_argument,	.flag = NULL,	.val = 'f'},
+	{ .name = "related",	.has_arg = no_argument,		.flag = NULL,	.val='r'},
+	{ },
+};
+
+static void print_error(void)
+{
+	printf(_("Error setting new values. Common errors:\n"
+			"- Do you have proper administration rights? (super-user?)\n"
+			"- Is the governor you requested available and modprobed?\n"
+			"- Trying to set an invalid policy?\n"
+			"- Trying to set a specific frequency, but userspace governor is not available,\n"
+			"   for example because of hardware which cannot be set to a specific frequency\n"
+			"   or because the userspace governor isn't loaded?\n"));
+};
+
+struct freq_units {
+	char		*str_unit;
+	int		power_of_ten;
+};
+
+const struct freq_units def_units[] = {
+	{"hz", -3},
+	{"khz", 0}, /* default */
+	{"mhz", 3},
+	{"ghz", 6},
+	{"thz", 9},
+	{NULL, 0}
+};
+
+static void print_unknown_arg(void)
+{
+	printf(_("invalid or unknown argument\n"));
+}
+
+static unsigned long string_to_frequency(const char *str)
+{
+	char normalized[NORM_FREQ_LEN];
+	const struct freq_units *unit;
+	const char *scan;
+	char *end;
+	unsigned long freq;
+	int power = 0, match_count = 0, i, cp, pad;
+
+	while (*str == '0')
+		str++;
+
+	for (scan = str; isdigit(*scan) || *scan == '.'; scan++) {
+		if (*scan == '.' && match_count == 0)
+			match_count = 1;
+		else if (*scan == '.' && match_count == 1)
+			return 0;
+	}
+
+	if (*scan) {
+		match_count = 0;
+		for (unit = def_units; unit->str_unit; unit++) {
+			for (i = 0;
+			     scan[i] && tolower(scan[i]) == unit->str_unit[i];
+			     ++i)
+				continue;
+			if (scan[i])
+				continue;
+			match_count++;
+			power = unit->power_of_ten;
+		}
+		if (match_count != 1)
+			return 0;
+	}
+
+	/* count the number of digits to be copied */
+	for (cp = 0; isdigit(str[cp]); cp++)
+		continue;
+
+	if (str[cp] == '.') {
+		while (power > -1 && isdigit(str[cp+1]))
+			cp++, power--;
+	}
+	if (power >= -1)	/* not enough => pad */
+		pad = power + 1;
+	else			/* to much => strip */
+		pad = 0, cp += power + 1;
+	/* check bounds */
+	if (cp <= 0 || cp + pad > NORM_FREQ_LEN - 1)
+		return 0;
+
+	/* copy digits */
+	for (i = 0; i < cp; i++, str++) {
+		if (*str == '.')
+			str++;
+		normalized[i] = *str;
+	}
+	/* and pad */
+	for (; i < cp + pad; i++)
+		normalized[i] = '0';
+
+	/* round up, down ? */
+	match_count = (normalized[i-1] >= '5');
+	/* and drop the decimal part */
+	normalized[i-1] = 0; /* cp > 0 && pad >= 0 ==> i > 0 */
+
+	/* final conversion (and applying rounding) */
+	errno = 0;
+	freq = strtoul(normalized, &end, 10);
+	if (errno)
+		return 0;
+	else {
+		if (match_count && freq != ULONG_MAX)
+			freq++;
+		return freq;
+	}
+}
+
+static int do_new_policy(unsigned int cpu, struct cpufreq_policy *new_pol)
+{
+	struct cpufreq_policy *cur_pol = cpufreq_get_policy(cpu);
+	int ret;
+
+	if (!cur_pol) {
+		printf(_("wrong, unknown or unhandled CPU?\n"));
+		return -EINVAL;
+	}
+
+	if (!new_pol->min)
+		new_pol->min = cur_pol->min;
+
+	if (!new_pol->max)
+		new_pol->max = cur_pol->max;
+
+	if (!new_pol->governor)
+		new_pol->governor = cur_pol->governor;
+
+	ret = cpufreq_set_policy(cpu, new_pol);
+
+	cpufreq_put_policy(cur_pol);
+
+	return ret;
+}
+
+
+static int do_one_cpu(unsigned int cpu, struct cpufreq_policy *new_pol,
+		unsigned long freq, unsigned int pc)
+{
+	switch (pc) {
+	case 0:
+		return cpufreq_set_frequency(cpu, freq);
+
+	case 1:
+		/* if only one value of a policy is to be changed, we can
+		 * use a "fast path".
+		 */
+		if (new_pol->min)
+			return cpufreq_modify_policy_min(cpu, new_pol->min);
+		else if (new_pol->max)
+			return cpufreq_modify_policy_max(cpu, new_pol->max);
+		else if (new_pol->governor)
+			return cpufreq_modify_policy_governor(cpu,
+							new_pol->governor);
+
+	default:
+		/* slow path */
+		return do_new_policy(cpu, new_pol);
+	}
+}
+
+int cmd_freq_set(int argc, char **argv)
+{
+	extern char *optarg;
+	extern int optind, opterr, optopt;
+	int ret = 0, cont = 1;
+	int double_parm = 0, related = 0, policychange = 0;
+	unsigned long freq = 0;
+	char gov[20];
+	unsigned int cpu;
+
+	struct cpufreq_policy new_pol = {
+		.min = 0,
+		.max = 0,
+		.governor = NULL,
+	};
+
+	/* parameter parsing */
+	do {
+		ret = getopt_long(argc, argv, "d:u:g:f:r", set_opts, NULL);
+		switch (ret) {
+		case '?':
+			print_unknown_arg();
+			return -EINVAL;
+		case -1:
+			cont = 0;
+			break;
+		case 'r':
+			if (related)
+				double_parm++;
+			related++;
+			break;
+		case 'd':
+			if (new_pol.min)
+				double_parm++;
+			policychange++;
+			new_pol.min = string_to_frequency(optarg);
+			if (new_pol.min == 0) {
+				print_unknown_arg();
+				return -EINVAL;
+			}
+			break;
+		case 'u':
+			if (new_pol.max)
+				double_parm++;
+			policychange++;
+			new_pol.max = string_to_frequency(optarg);
+			if (new_pol.max == 0) {
+				print_unknown_arg();
+				return -EINVAL;
+			}
+			break;
+		case 'f':
+			if (freq)
+				double_parm++;
+			freq = string_to_frequency(optarg);
+			if (freq == 0) {
+				print_unknown_arg();
+				return -EINVAL;
+			}
+			break;
+		case 'g':
+			if (new_pol.governor)
+				double_parm++;
+			policychange++;
+			if ((strlen(optarg) < 3) || (strlen(optarg) > 18)) {
+				print_unknown_arg();
+				return -EINVAL;
+			}
+			if ((sscanf(optarg, "%s", gov)) != 1) {
+				print_unknown_arg();
+				return -EINVAL;
+			}
+			new_pol.governor = gov;
+			break;
+		}
+	} while (cont);
+
+	/* parameter checking */
+	if (double_parm) {
+		printf("the same parameter was passed more than once\n");
+		return -EINVAL;
+	}
+
+	if (freq && policychange) {
+		printf(_("the -f/--freq parameter cannot be combined with -d/--min, -u/--max or\n"
+				"-g/--governor parameters\n"));
+		return -EINVAL;
+	}
+
+	if (!freq && !policychange) {
+		printf(_("At least one parameter out of -f/--freq, -d/--min, -u/--max, and\n"
+				"-g/--governor must be passed\n"));
+		return -EINVAL;
+	}
+
+	/* Default is: set all CPUs */
+	if (bitmask_isallclear(cpus_chosen))
+		bitmask_setall(cpus_chosen);
+
+	/* Also set frequency settings for related CPUs if -r is passed */
+	if (related) {
+		for (cpu = bitmask_first(cpus_chosen);
+		     cpu <= bitmask_last(cpus_chosen); cpu++) {
+			struct cpufreq_affected_cpus *cpus;
+
+			if (!bitmask_isbitset(cpus_chosen, cpu) ||
+			    cpufreq_cpu_exists(cpu))
+				continue;
+
+			cpus = cpufreq_get_related_cpus(cpu);
+			if (!cpus)
+				break;
+			while (cpus->next) {
+				bitmask_setbit(cpus_chosen, cpus->cpu);
+				cpus = cpus->next;
+			}
+			cpufreq_put_related_cpus(cpus);
+		}
+	}
+
+
+	/* 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;
+
+		printf(_("Setting cpu: %d\n"), cpu);
+		ret = do_one_cpu(cpu, &new_pol, freq, policychange);
+		if (ret)
+			break;
+	}
+
+	if (ret)
+		print_error();
+
+	return ret;
+}