1*9c5db199SXin Li /*
2*9c5db199SXin Li * Copyright 2007, Intel Corporation
3*9c5db199SXin Li *
4*9c5db199SXin Li * This file is part of PowerTOP
5*9c5db199SXin Li *
6*9c5db199SXin Li * This program file is free software; you can redistribute it and/or modify it
7*9c5db199SXin Li * under the terms of the GNU General Public License as published by the
8*9c5db199SXin Li * Free Software Foundation; version 2 of the License.
9*9c5db199SXin Li *
10*9c5db199SXin Li * This program is distributed in the hope that it will be useful, but WITHOUT
11*9c5db199SXin Li * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12*9c5db199SXin Li * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13*9c5db199SXin Li * for more details.
14*9c5db199SXin Li *
15*9c5db199SXin Li * You should have received a copy of the GNU General Public License
16*9c5db199SXin Li * along with this program in a file named COPYING; if not, write to the
17*9c5db199SXin Li * Free Software Foundation, Inc.,
18*9c5db199SXin Li * 51 Franklin Street, Fifth Floor,
19*9c5db199SXin Li * Boston, MA 02110-1301 USA
20*9c5db199SXin Li *
21*9c5db199SXin Li * Authors:
22*9c5db199SXin Li * Arjan van de Ven <[email protected]>
23*9c5db199SXin Li */
24*9c5db199SXin Li
25*9c5db199SXin Li #include <unistd.h>
26*9c5db199SXin Li #include <stdio.h>
27*9c5db199SXin Li #include <stdlib.h>
28*9c5db199SXin Li #include <string.h>
29*9c5db199SXin Li #include <stdint.h>
30*9c5db199SXin Li #include <sys/types.h>
31*9c5db199SXin Li #include <dirent.h>
32*9c5db199SXin Li
33*9c5db199SXin Li #include "powertop.h"
34*9c5db199SXin Li
activate_ondemand(void)35*9c5db199SXin Li static void activate_ondemand(void)
36*9c5db199SXin Li {
37*9c5db199SXin Li DIR *dir;
38*9c5db199SXin Li struct dirent *dirent;
39*9c5db199SXin Li FILE *file;
40*9c5db199SXin Li char filename[PATH_MAX];
41*9c5db199SXin Li
42*9c5db199SXin Li system("/sbin/modprobe cpufreq_ondemand &> /dev/null");
43*9c5db199SXin Li
44*9c5db199SXin Li
45*9c5db199SXin Li dir = opendir("/sys/devices/system/cpu");
46*9c5db199SXin Li if (!dir)
47*9c5db199SXin Li return;
48*9c5db199SXin Li
49*9c5db199SXin Li while ((dirent = readdir(dir))) {
50*9c5db199SXin Li if (dirent->d_name[0]=='.')
51*9c5db199SXin Li continue;
52*9c5db199SXin Li sprintf(filename, "/sys/devices/system/cpu/%s/cpufreq/scaling_governor", dirent->d_name);
53*9c5db199SXin Li file = fopen(filename, "w");
54*9c5db199SXin Li if (!file)
55*9c5db199SXin Li continue;
56*9c5db199SXin Li fprintf(file, "ondemand\n");
57*9c5db199SXin Li fclose(file);
58*9c5db199SXin Li }
59*9c5db199SXin Li
60*9c5db199SXin Li closedir(dir);
61*9c5db199SXin Li }
62*9c5db199SXin Li
suggest_ondemand_governor(void)63*9c5db199SXin Li void suggest_ondemand_governor(void)
64*9c5db199SXin Li {
65*9c5db199SXin Li DIR *dir;
66*9c5db199SXin Li struct dirent *dirent;
67*9c5db199SXin Li FILE *file;
68*9c5db199SXin Li char filename[PATH_MAX];
69*9c5db199SXin Li char line[1024];
70*9c5db199SXin Li
71*9c5db199SXin Li char gov[1024];
72*9c5db199SXin Li int ret = 0;
73*9c5db199SXin Li
74*9c5db199SXin Li
75*9c5db199SXin Li gov[0] = 0;
76*9c5db199SXin Li
77*9c5db199SXin Li
78*9c5db199SXin Li dir = opendir("/sys/devices/system/cpu");
79*9c5db199SXin Li if (!dir)
80*9c5db199SXin Li return;
81*9c5db199SXin Li
82*9c5db199SXin Li while ((dirent = readdir(dir))) {
83*9c5db199SXin Li if (dirent->d_name[0]=='.')
84*9c5db199SXin Li continue;
85*9c5db199SXin Li sprintf(filename, "/sys/devices/system/cpu/%s/cpufreq/scaling_governor", dirent->d_name);
86*9c5db199SXin Li file = fopen(filename, "r");
87*9c5db199SXin Li if (!file)
88*9c5db199SXin Li continue;
89*9c5db199SXin Li memset(line, 0, 1024);
90*9c5db199SXin Li if (fgets(line, 1023,file)==NULL) {
91*9c5db199SXin Li fclose(file);
92*9c5db199SXin Li continue;
93*9c5db199SXin Li }
94*9c5db199SXin Li if (strlen(gov)==0)
95*9c5db199SXin Li strcpy(gov, line);
96*9c5db199SXin Li else
97*9c5db199SXin Li /* if the governors are inconsistent, warn */
98*9c5db199SXin Li if (strcmp(gov, line))
99*9c5db199SXin Li ret = 1;
100*9c5db199SXin Li fclose(file);
101*9c5db199SXin Li }
102*9c5db199SXin Li
103*9c5db199SXin Li closedir(dir);
104*9c5db199SXin Li
105*9c5db199SXin Li /* if the governor is set to userspace, also warn */
106*9c5db199SXin Li if (strstr(gov, "userspace"))
107*9c5db199SXin Li ret = 1;
108*9c5db199SXin Li
109*9c5db199SXin Li /* if the governor is set to performance, also warn */
110*9c5db199SXin Li /* FIXME: check if this is fair on all cpus */
111*9c5db199SXin Li if (strstr(gov, "performance"))
112*9c5db199SXin Li ret = 1;
113*9c5db199SXin Li
114*9c5db199SXin Li
115*9c5db199SXin Li if (ret) {
116*9c5db199SXin Li add_suggestion(_("Suggestion: Enable the ondemand cpu speed governor for all processors via: \n"
117*9c5db199SXin Li " echo ondemand > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor \n"),
118*9c5db199SXin Li 15, 'O', _(" O - enable Ondemand governor "), activate_ondemand);
119*9c5db199SXin Li }
120*9c5db199SXin Li }
121