1/*
2 * Copyright 2007, Intel Corporation
3 *
4 * This file is part of PowerTOP
5 *
6 * This program file is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; version 2 of the License.
9 *
10 * This program is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
13 * for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program in a file named COPYING; if not, write to the
17 * Free Software Foundation, Inc.,
18 * 51 Franklin Street, Fifth Floor,
19 * Boston, MA 02110-1301 USA
20 *
21 * Authors:
22 * 	Arjan van de Ven <arjan@linux.intel.com>
23 */
24
25#include <unistd.h>
26#include <stdio.h>
27#include <stdlib.h>
28#include <string.h>
29#include <stdint.h>
30#include <sys/types.h>
31#include <dirent.h>
32
33#include "powertop.h"
34
35static void activate_ondemand(void)
36{
37	DIR *dir;
38	struct dirent *dirent;
39	FILE *file;
40	char filename[PATH_MAX];
41
42	system("/sbin/modprobe cpufreq_ondemand &> /dev/null");
43
44
45	dir = opendir("/sys/devices/system/cpu");
46	if (!dir)
47		return;
48
49	while ((dirent = readdir(dir))) {
50		if (dirent->d_name[0]=='.')
51			continue;
52		sprintf(filename, "/sys/devices/system/cpu/%s/cpufreq/scaling_governor", dirent->d_name);
53		file = fopen(filename, "w");
54		if (!file)
55			continue;
56		fprintf(file, "ondemand\n");
57		fclose(file);
58	}
59
60	closedir(dir);
61}
62
63void suggest_ondemand_governor(void)
64{
65	DIR *dir;
66	struct dirent *dirent;
67	FILE *file;
68	char filename[PATH_MAX];
69	char line[1024];
70
71	char gov[1024];
72	int ret = 0;
73
74
75	gov[0] = 0;
76
77
78	dir = opendir("/sys/devices/system/cpu");
79	if (!dir)
80		return;
81
82	while ((dirent = readdir(dir))) {
83		if (dirent->d_name[0]=='.')
84			continue;
85		sprintf(filename, "/sys/devices/system/cpu/%s/cpufreq/scaling_governor", dirent->d_name);
86		file = fopen(filename, "r");
87		if (!file)
88			continue;
89		memset(line, 0, 1024);
90		if (fgets(line, 1023,file)==NULL) {
91			fclose(file);
92			continue;
93		}
94		if (strlen(gov)==0)
95			strcpy(gov, line);
96		else
97			/* if the governors are inconsistent, warn */
98			if (strcmp(gov, line))
99				ret = 1;
100		fclose(file);
101	}
102
103	closedir(dir);
104
105	/* if the governor is set to userspace, also warn */
106	if (strstr(gov, "userspace"))
107		ret = 1;
108
109	/* if the governor is set to performance, also warn */
110	/* FIXME: check if this is fair on all cpus */
111	if (strstr(gov, "performance"))
112		ret = 1;
113
114
115	if (ret) {
116		add_suggestion(_("Suggestion: Enable the ondemand cpu speed governor for all processors via: \n"
117				 " echo ondemand > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor \n"),
118				15, 'O', _(" O - enable Ondemand governor "), activate_ondemand);
119	}
120}
121