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
35void set_laptop_mode(void)
36{
37	FILE *file;
38	file = fopen("/proc/sys/vm/laptop_mode", "w");
39	if (!file)
40		return;
41	fprintf(file,"5\n");
42	fclose(file);
43}
44
45void suggest_laptop_mode(void)
46{
47	FILE *file;
48	int i;
49	char buffer[1024];
50	/*
51	 * Check to see if we are on AC - lots of distros have
52	 * annoying scripts to turn laptop mode off when on AC, which
53	 * results in annoying distracting return of set laptop mode
54	 * hint.
55	 */
56	file = fopen("/proc/acpi/ac_adapter/AC/state", "r");
57	if (!file)
58		return;
59	memset(buffer, 0, 1024);
60	if (!fgets(buffer, 1023, file)) {
61		fclose(file);
62		return;
63	}
64	fclose(file);
65	if (strstr(buffer, "on-line") != NULL)
66		return;
67
68	/* Now check for laptop mode */
69	file = fopen("/proc/sys/vm/laptop_mode", "r");
70	if (!file)
71		return;
72	memset(buffer, 0, 1024);
73	if (!fgets(buffer, 1023, file)) {
74		fclose(file);
75		return;
76	}
77	i = strtoul(buffer, NULL, 10);
78	if (i<1) {
79		add_suggestion( _("Suggestion: Enable laptop-mode by executing the following command:\n"
80		 	"   echo 5 > /proc/sys/vm/laptop_mode \n"), 15, 'L', _(" L - enable Laptop mode "), set_laptop_mode);
81	}
82	fclose(file);
83}
84
85void nmi_watchdog_off(void)
86{
87	FILE *file;
88	file = fopen("/proc/sys/kernel/nmi_watchdog", "w");
89	if (!file)
90		return;
91	fprintf(file,"0\n");
92	fclose(file);
93}
94void suggest_nmi_watchdog(void)
95{
96	FILE *file;
97	int i;
98	char buffer[1024];
99	file = fopen("/proc/sys/kernel/nmi_watchdog", "r");
100	if (!file)
101		return;
102	memset(buffer, 0, 1024);
103	if (!fgets(buffer, 1023, file)) {
104		fclose(file);
105		return;
106	}
107	i = strtoul(buffer, NULL, 10);
108	if (i!=0) {
109		add_suggestion( _("Suggestion: disable the NMI watchdog by executing the following command:\n"
110		 	"   echo 0 > /proc/sys/kernel/nmi_watchdog \n"
111			"The NMI watchdog is a kernel debug mechanism to detect deadlocks"), 25, 'N', _(" N - Turn NMI watchdog off "), nmi_watchdog_off);
112	}
113	fclose(file);
114}
115
116void suggest_hpet(void)
117{
118	FILE *file;
119	char buffer[1024];
120	file = fopen("/sys/devices/system/clocksource/clocksource0/available_clocksource", "r");
121	if (!file)
122		return;
123	memset(buffer, 0, 1024);
124
125	if (!fgets(buffer, 1023, file)) {
126		fclose(file);
127		return;
128	}
129
130	if (strstr(buffer, "hpet")) {
131		fclose(file);
132		return;
133	}
134
135	fclose(file);
136
137	add_suggestion( _("Suggestion: enable the HPET (Multimedia Timer) in your BIOS or add \n"
138		          "the kernel patch to force-enable HPET. HPET support allows Linux to \n"
139			  "have much longer sleep intervals."), 7, 0, NULL, NULL);
140}
141
142void ac97_power_on(void)
143{
144	FILE *file;
145	file = fopen("/sys/module/snd_ac97_codec/parameters/power_save", "w");
146	if (!file)
147		return;
148	fprintf(file,"1");
149	fclose(file);
150	if (access("/dev/dsp", F_OK))
151		return;
152	file = fopen("/dev/dsp", "w");
153	if (file) {
154		fprintf(file,"1");
155		fclose(file);
156	}
157}
158
159void suggest_ac97_powersave(void)
160{
161	FILE *file;
162	char buffer[1024];
163	file = fopen("/sys/module/snd_ac97_codec/parameters/power_save", "r");
164	if (!file)
165		return;
166	memset(buffer, 0, 1024);
167	if (!fgets(buffer, 1023, file)) {
168		fclose(file);
169		return;
170	}
171	if (buffer[0]=='N') {
172		add_suggestion( _("Suggestion: enable AC97 powersave mode by executing the following command:\n"
173		 	"   echo 1 > /sys/module/snd_ac97_codec/parameters/power_save \n"
174			"or by passing power_save=1 as module parameter."), 25, 'A', _(" A - Turn AC97 powersave on "), ac97_power_on);
175	}
176	fclose(file);
177}
178
179void noatime_on(void)
180{
181	system("/bin/mount -o remount,noatime,nodiratime /");
182}
183
184void suggest_noatime(void)
185{
186	FILE *file;
187	char buffer[1024];
188	int suggest = 0;
189	file = fopen("/proc/mounts","r");
190	if (!file)
191		return;
192	while (!feof(file)) {
193		memset(buffer, 0, 1024);
194		if (!fgets(buffer, 1023, file))
195			break;
196		if (strstr(buffer, " / ext3") && !strstr(buffer, "noatime") && !strstr(buffer, "relatime"))
197			suggest = 1;
198
199	}
200	if (suggest) {
201		add_suggestion( _("Suggestion: enable the noatime filesystem option by executing the following command:\n"
202		 	"   mount -o remount,noatime /          or by pressing the T key \n"
203			"noatime disables persistent access time of file accesses, which causes lots of disk IO."), 5, 'T', _(" T - enable noatime "), noatime_on);
204	}
205	fclose(file);
206}
207
208void powersched_on(void)
209{
210	FILE *file;
211	file = fopen("/sys/devices/system/cpu/sched_mc_power_savings", "w");
212	if (!file)
213		return;
214	fprintf(file,"1");
215	fclose(file);
216}
217
218void suggest_powersched(void)
219{
220	FILE *file;
221	char buffer[1024];
222	int suggest = 0;
223	int cpu;
224
225	file = fopen("/sys/devices/system/cpu/sched_mc_power_savings","r");
226	if (!file)
227		return;
228	memset(buffer, 0, 1024);
229	if (!fgets(buffer, 1023, file)) {
230		fclose(file);
231		return;
232	}
233	fclose(file);
234	if (buffer[0]!='0')
235		return;
236	/* ok so power saving scheduler is off; now to see if we actually have a multi-package system */
237	cpu =  sysconf(_SC_NPROCESSORS_ONLN);
238
239	if (cpu<2)
240		return; /* UP system */
241
242	file = fopen("/proc/cpuinfo", "r");
243	suggest = 1;
244	if (!file)
245		return;
246	while (!feof(file)) {
247		memset(buffer, 0, 1024);
248		char *c;
249		if (!fgets(buffer, 1023, file))
250			break;
251		if (strstr(buffer, "cpu cores")) {
252			c = strchr(buffer, ':');
253			if (!c)
254				continue;
255			c++;
256			if (strtoll(c, NULL, 10) >= cpu)
257				suggest = 0;
258		}
259	}
260	fclose(file);
261
262
263	if (suggest) {
264		add_suggestion( _("Suggestion: enable the power aware CPU scheduler with the following command:\n"
265		 	"  echo 1 > /sys/devices/system/cpu/sched_mc_power_savings\n"
266			"or by pressing the C key."), 5, 'C', _(" C - Power aware CPU scheduler "), powersched_on);
267	}
268}
269
270
271void writeback_long(void)
272{
273	FILE *file;
274	file = fopen("/proc/sys/vm/dirty_writeback_centisecs", "w");
275	if (!file)
276		return;
277	fprintf(file,"1500");
278	fclose(file);
279}
280
281void suggest_writeback_time(void)
282{
283	FILE *file;
284	char buffer[1024];
285	int i;
286	file = fopen("/proc/sys/vm/dirty_writeback_centisecs", "r");
287	if (!file)
288		return;
289	memset(buffer, 0, 1024);
290	if (!fgets(buffer, 1023, file)) {
291		fclose(file);
292		return;
293	}
294	i = strtoull(buffer, NULL, 10);
295	if (i<1400) {
296		char line[1024];
297		sprintf(line,_("Suggestion: increase the VM dirty writeback time from %1.2f to 15 seconds with:\n"
298			 	"  echo 1500 > /proc/sys/vm/dirty_writeback_centisecs \n"
299				"This wakes the disk up less frequently for background VM activity"),
300			i/100.0);
301		add_suggestion(line, 15, 'W', _(" W - Increase Writeback time "), writeback_long);
302	}
303	fclose(file);
304}
305