1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2004 Colin Percival
5 * Copyright (c) 2005 Nate Lawson
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted providing that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
25 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
26 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
27 * POSSIBILITY OF SUCH DAMAGE.
28 */
29
30 #include <sys/cdefs.h>
31 #include <sys/param.h>
32 #include <sys/ioctl.h>
33 #include <sys/sysctl.h>
34 #include <sys/resource.h>
35 #include <sys/socket.h>
36 #include <sys/time.h>
37 #include <sys/un.h>
38
39 #include <err.h>
40 #include <errno.h>
41 #include <fcntl.h>
42 #include <libutil.h>
43 #include <signal.h>
44 #include <stdio.h>
45 #include <stdlib.h>
46 #include <string.h>
47 #include <sysexits.h>
48 #include <unistd.h>
49
50 #ifdef __i386__
51 #define USE_APM
52 #endif
53
54 #ifdef USE_APM
55 #include <machine/apm_bios.h>
56 #endif
57
58 #define DEFAULT_ACTIVE_PERCENT 75
59 #define DEFAULT_IDLE_PERCENT 50
60 #define DEFAULT_POLL_INTERVAL 250 /* Poll interval in milliseconds */
61
62 typedef enum {
63 MODE_MIN,
64 MODE_ADAPTIVE,
65 MODE_HIADAPTIVE,
66 MODE_MAX,
67 } modes_t;
68
69 typedef enum {
70 SRC_AC,
71 SRC_BATTERY,
72 SRC_UNKNOWN,
73 } power_src_t;
74
75 static const char *modes[] = {
76 "AC",
77 "battery",
78 "unknown"
79 };
80
81 #define ACPIAC "hw.acpi.acline"
82 #define PMUAC "dev.pmu.0.acline"
83 #define APMDEV "/dev/apm"
84 #define DEVDPIPE "/var/run/devd.pipe"
85 #define DEVCTL_MAXBUF 1024
86
87 static int read_usage_times(int *load, int nonice);
88 static int read_freqs(int *numfreqs, int **freqs, int **power,
89 int minfreq, int maxfreq);
90 static int set_freq(int freq);
91 static void acline_init(void);
92 static void acline_read(void);
93 static int devd_init(void);
94 static void devd_close(void);
95 static void handle_sigs(int sig);
96 static void parse_mode(char *arg, int *mode, int ch);
97 static void usage(void);
98
99 /* Sysctl data structures. */
100 static int cp_times_mib[2];
101 static int freq_mib[4];
102 static int levels_mib[4];
103 static int acline_mib[4];
104 static size_t acline_mib_len;
105
106 /* Configuration */
107 static int cpu_running_mark;
108 static int cpu_idle_mark;
109 static int poll_ival;
110 static int vflag;
111
112 static volatile sig_atomic_t exit_requested;
113 static power_src_t acline_status;
114 typedef enum {
115 ac_none,
116 ac_sysctl,
117 ac_acpi_devd,
118 #ifdef USE_APM
119 ac_apm,
120 #endif
121 } acline_mode_t;
122 static acline_mode_t acline_mode;
123 static acline_mode_t acline_mode_user = ac_none;
124 #ifdef USE_APM
125 static int apm_fd = -1;
126 #endif
127 static int devd_pipe = -1;
128
129 #define DEVD_RETRY_INTERVAL 60 /* seconds */
130 static struct timeval tried_devd;
131
132 /*
133 * This function returns summary load of all CPUs. It was made so
134 * intentionally to not reduce performance in scenarios when several
135 * threads are processing requests as a pipeline -- running one at
136 * a time on different CPUs and waiting for each other. If nonice
137 * is nonzero, only user+sys+intr time will be counted as load; any
138 * nice time will be treated as if idle.
139 */
140 static int
read_usage_times(int * load,int nonice)141 read_usage_times(int *load, int nonice)
142 {
143 static long *cp_times = NULL, *cp_times_old = NULL;
144 static int ncpus = 0;
145 size_t cp_times_len;
146 int error, cpu, i, total, excl;
147
148 if (cp_times == NULL) {
149 cp_times_len = 0;
150 error = sysctl(cp_times_mib, 2, NULL, &cp_times_len, NULL, 0);
151 if (error)
152 return (error);
153 if ((cp_times = malloc(cp_times_len)) == NULL)
154 return (errno);
155 if ((cp_times_old = malloc(cp_times_len)) == NULL) {
156 free(cp_times);
157 cp_times = NULL;
158 return (errno);
159 }
160 ncpus = cp_times_len / (sizeof(long) * CPUSTATES);
161 }
162
163 cp_times_len = sizeof(long) * CPUSTATES * ncpus;
164 error = sysctl(cp_times_mib, 2, cp_times, &cp_times_len, NULL, 0);
165 if (error)
166 return (error);
167
168 if (load) {
169 *load = 0;
170 for (cpu = 0; cpu < ncpus; cpu++) {
171 total = 0;
172 for (i = 0; i < CPUSTATES; i++) {
173 total += cp_times[cpu * CPUSTATES + i] -
174 cp_times_old[cpu * CPUSTATES + i];
175 }
176 if (total == 0)
177 continue;
178 excl = cp_times[cpu * CPUSTATES + CP_IDLE] -
179 cp_times_old[cpu * CPUSTATES + CP_IDLE];
180 if (nonice)
181 excl += cp_times[cpu * CPUSTATES + CP_NICE] -
182 cp_times_old[cpu * CPUSTATES + CP_NICE];
183 *load += 100 - excl * 100 / total;
184 }
185 }
186
187 memcpy(cp_times_old, cp_times, cp_times_len);
188
189 return (0);
190 }
191
192 static int
read_freqs(int * numfreqs,int ** freqs,int ** power,int minfreq,int maxfreq)193 read_freqs(int *numfreqs, int **freqs, int **power, int minfreq, int maxfreq)
194 {
195 char *freqstr, *p, *q;
196 int i, j;
197 size_t len = 0;
198
199 if (sysctl(levels_mib, 4, NULL, &len, NULL, 0))
200 return (-1);
201 if ((freqstr = malloc(len)) == NULL)
202 return (-1);
203 if (sysctl(levels_mib, 4, freqstr, &len, NULL, 0)) {
204 free(freqstr);
205 return (-1);
206 }
207
208 *numfreqs = 1;
209 for (p = freqstr; *p != '\0'; p++)
210 if (*p == ' ')
211 (*numfreqs)++;
212
213 if ((*freqs = malloc(*numfreqs * sizeof(int))) == NULL) {
214 free(freqstr);
215 return (-1);
216 }
217 if ((*power = malloc(*numfreqs * sizeof(int))) == NULL) {
218 free(freqstr);
219 free(*freqs);
220 return (-1);
221 }
222 for (i = 0, j = 0, p = freqstr; i < *numfreqs; i++) {
223 q = strchr(p, ' ');
224 if (q != NULL)
225 *q = '\0';
226 if (sscanf(p, "%d/%d", &(*freqs)[j], &(*power)[i]) != 2) {
227 free(freqstr);
228 free(*freqs);
229 free(*power);
230 return (-1);
231 }
232 if (((*freqs)[j] >= minfreq || minfreq == -1) &&
233 ((*freqs)[j] <= maxfreq || maxfreq == -1))
234 j++;
235 p = q + 1;
236 }
237
238 *numfreqs = j;
239 if ((*freqs = realloc(*freqs, *numfreqs * sizeof(int))) == NULL) {
240 free(freqstr);
241 free(*freqs);
242 free(*power);
243 return (-1);
244 }
245
246 free(freqstr);
247 return (0);
248 }
249
250 static int
get_freq(void)251 get_freq(void)
252 {
253 size_t len;
254 int curfreq;
255
256 len = sizeof(curfreq);
257 if (sysctl(freq_mib, 4, &curfreq, &len, NULL, 0) != 0) {
258 if (vflag)
259 warn("error reading current CPU frequency");
260 curfreq = 0;
261 }
262 return (curfreq);
263 }
264
265 static int
set_freq(int freq)266 set_freq(int freq)
267 {
268
269 if (sysctl(freq_mib, 4, NULL, NULL, &freq, sizeof(freq))) {
270 if (errno != EPERM)
271 return (-1);
272 }
273
274 return (0);
275 }
276
277 static int
get_freq_id(int freq,int * freqs,int numfreqs)278 get_freq_id(int freq, int *freqs, int numfreqs)
279 {
280 int i = 1;
281
282 while (i < numfreqs) {
283 if (freqs[i] < freq)
284 break;
285 i++;
286 }
287 return (i - 1);
288 }
289
290 /*
291 * Try to use ACPI to find the AC line status. If this fails, fall back
292 * to APM. If nothing succeeds, we'll just run in default mode.
293 */
294 static void
acline_init(void)295 acline_init(void)
296 {
297 int skip_source_check;
298
299 acline_mib_len = 4;
300 acline_status = SRC_UNKNOWN;
301 skip_source_check = (acline_mode_user == ac_none ||
302 acline_mode_user == ac_acpi_devd);
303
304 if ((skip_source_check || acline_mode_user == ac_sysctl) &&
305 sysctlnametomib(ACPIAC, acline_mib, &acline_mib_len) == 0) {
306 acline_mode = ac_sysctl;
307 if (vflag)
308 warnx("using sysctl for AC line status");
309 #ifdef __powerpc__
310 } else if ((skip_source_check || acline_mode_user == ac_sysctl) &&
311 sysctlnametomib(PMUAC, acline_mib, &acline_mib_len) == 0) {
312 acline_mode = ac_sysctl;
313 if (vflag)
314 warnx("using sysctl for AC line status");
315 #endif
316 #ifdef USE_APM
317 } else if ((skip_source_check || acline_mode_user == ac_apm) &&
318 (apm_fd = open(APMDEV, O_RDONLY)) >= 0) {
319 if (vflag)
320 warnx("using APM for AC line status");
321 acline_mode = ac_apm;
322 #endif
323 } else {
324 warnx("unable to determine AC line status");
325 acline_mode = ac_none;
326 }
327 }
328
329 static void
acline_read(void)330 acline_read(void)
331 {
332 if (acline_mode == ac_acpi_devd) {
333 char buf[DEVCTL_MAXBUF], *ptr;
334 ssize_t rlen;
335 int notify;
336
337 rlen = read(devd_pipe, buf, sizeof(buf));
338 if (rlen == 0 || (rlen < 0 && errno != EWOULDBLOCK)) {
339 if (vflag)
340 warnx("lost devd connection, switching to sysctl");
341 devd_close();
342 acline_mode = ac_sysctl;
343 /* FALLTHROUGH */
344 }
345 if (rlen > 0 &&
346 (ptr = strstr(buf, "system=ACPI")) != NULL &&
347 (ptr = strstr(ptr, "subsystem=ACAD")) != NULL &&
348 (ptr = strstr(ptr, "notify=")) != NULL &&
349 sscanf(ptr, "notify=%x", ¬ify) == 1)
350 acline_status = (notify ? SRC_AC : SRC_BATTERY);
351 }
352 if (acline_mode == ac_sysctl) {
353 int acline;
354 size_t len;
355
356 len = sizeof(acline);
357 if (sysctl(acline_mib, acline_mib_len, &acline, &len,
358 NULL, 0) == 0)
359 acline_status = (acline ? SRC_AC : SRC_BATTERY);
360 else
361 acline_status = SRC_UNKNOWN;
362 }
363 #ifdef USE_APM
364 if (acline_mode == ac_apm) {
365 struct apm_info info;
366
367 if (ioctl(apm_fd, APMIO_GETINFO, &info) == 0) {
368 acline_status = (info.ai_acline ? SRC_AC : SRC_BATTERY);
369 } else {
370 close(apm_fd);
371 apm_fd = -1;
372 acline_mode = ac_none;
373 acline_status = SRC_UNKNOWN;
374 }
375 }
376 #endif
377 /* try to (re)connect to devd */
378 #ifdef USE_APM
379 if ((acline_mode == ac_sysctl &&
380 (acline_mode_user == ac_none ||
381 acline_mode_user == ac_acpi_devd)) ||
382 (acline_mode == ac_apm &&
383 acline_mode_user == ac_acpi_devd)) {
384 #else
385 if (acline_mode == ac_sysctl &&
386 (acline_mode_user == ac_none ||
387 acline_mode_user == ac_acpi_devd)) {
388 #endif
389 struct timeval now;
390
391 gettimeofday(&now, NULL);
392 if (now.tv_sec > tried_devd.tv_sec + DEVD_RETRY_INTERVAL) {
393 if (devd_init() >= 0) {
394 if (vflag)
395 warnx("using devd for AC line status");
396 acline_mode = ac_acpi_devd;
397 }
398 tried_devd = now;
399 }
400 }
401 }
402
403 static int
404 devd_init(void)
405 {
406 struct sockaddr_un devd_addr;
407
408 bzero(&devd_addr, sizeof(devd_addr));
409 if ((devd_pipe = socket(PF_LOCAL, SOCK_STREAM|SOCK_NONBLOCK, 0)) < 0) {
410 if (vflag)
411 warn("%s(): socket()", __func__);
412 return (-1);
413 }
414
415 devd_addr.sun_family = PF_LOCAL;
416 strlcpy(devd_addr.sun_path, DEVDPIPE, sizeof(devd_addr.sun_path));
417 if (connect(devd_pipe, (struct sockaddr *)&devd_addr,
418 sizeof(devd_addr)) == -1) {
419 if (vflag)
420 warn("%s(): connect()", __func__);
421 close(devd_pipe);
422 devd_pipe = -1;
423 return (-1);
424 }
425
426 return (devd_pipe);
427 }
428
429 static void
430 devd_close(void)
431 {
432
433 close(devd_pipe);
434 devd_pipe = -1;
435 }
436
437 static void
438 parse_mode(char *arg, int *mode, int ch)
439 {
440
441 if (strcmp(arg, "minimum") == 0 || strcmp(arg, "min") == 0)
442 *mode = MODE_MIN;
443 else if (strcmp(arg, "maximum") == 0 || strcmp(arg, "max") == 0)
444 *mode = MODE_MAX;
445 else if (strcmp(arg, "adaptive") == 0 || strcmp(arg, "adp") == 0)
446 *mode = MODE_ADAPTIVE;
447 else if (strcmp(arg, "hiadaptive") == 0 || strcmp(arg, "hadp") == 0)
448 *mode = MODE_HIADAPTIVE;
449 else
450 errx(1, "bad option: -%c %s", (char)ch, optarg);
451 }
452
453 static void
454 parse_acline_mode(char *arg, int ch)
455 {
456 if (strcmp(arg, "sysctl") == 0)
457 acline_mode_user = ac_sysctl;
458 else if (strcmp(arg, "devd") == 0)
459 acline_mode_user = ac_acpi_devd;
460 #ifdef USE_APM
461 else if (strcmp(arg, "apm") == 0)
462 acline_mode_user = ac_apm;
463 #endif
464 else
465 errx(1, "bad option: -%c %s", (char)ch, optarg);
466 }
467
468 static void
469 handle_sigs(int __unused sig)
470 {
471
472 exit_requested = 1;
473 }
474
475 static void
476 usage(void)
477 {
478
479 fprintf(stderr,
480 "usage: powerd [-v] [-a mode] [-b mode] [-i %%] [-m freq] [-M freq] [-N] [-n mode] [-p ival] [-r %%] [-s source] [-P pidfile]\n");
481 exit(1);
482 }
483
484 int
485 main(int argc, char * argv[])
486 {
487 struct timeval timeout;
488 fd_set fdset;
489 int nfds;
490 struct pidfh *pfh = NULL;
491 const char *pidfile = NULL;
492 int freq, curfreq, initfreq, *freqs, i, j, *mwatts, numfreqs, load;
493 int minfreq = -1, maxfreq = -1;
494 int ch, mode, mode_ac, mode_battery, mode_none, idle, to;
495 uint64_t mjoules_used;
496 size_t len;
497 int nonice;
498
499 /* Default mode for all AC states is adaptive. */
500 mode_ac = mode_none = MODE_HIADAPTIVE;
501 mode_battery = MODE_ADAPTIVE;
502 cpu_running_mark = DEFAULT_ACTIVE_PERCENT;
503 cpu_idle_mark = DEFAULT_IDLE_PERCENT;
504 poll_ival = DEFAULT_POLL_INTERVAL;
505 mjoules_used = 0;
506 vflag = 0;
507 nonice = 0;
508
509 /* User must be root to control frequencies. */
510 if (geteuid() != 0)
511 errx(1, "must be root to run");
512
513 while ((ch = getopt(argc, argv, "a:b:i:m:M:Nn:p:P:r:s:v")) != -1)
514 switch (ch) {
515 case 'a':
516 parse_mode(optarg, &mode_ac, ch);
517 break;
518 case 'b':
519 parse_mode(optarg, &mode_battery, ch);
520 break;
521 case 's':
522 parse_acline_mode(optarg, ch);
523 break;
524 case 'i':
525 cpu_idle_mark = atoi(optarg);
526 if (cpu_idle_mark < 0 || cpu_idle_mark > 100) {
527 warnx("%d is not a valid percent",
528 cpu_idle_mark);
529 usage();
530 }
531 break;
532 case 'm':
533 minfreq = atoi(optarg);
534 if (minfreq < 0) {
535 warnx("%d is not a valid CPU frequency",
536 minfreq);
537 usage();
538 }
539 break;
540 case 'M':
541 maxfreq = atoi(optarg);
542 if (maxfreq < 0) {
543 warnx("%d is not a valid CPU frequency",
544 maxfreq);
545 usage();
546 }
547 break;
548 case 'N':
549 nonice = 1;
550 break;
551 case 'n':
552 parse_mode(optarg, &mode_none, ch);
553 break;
554 case 'p':
555 poll_ival = atoi(optarg);
556 if (poll_ival < 5) {
557 warnx("poll interval is in units of ms");
558 usage();
559 }
560 break;
561 case 'P':
562 pidfile = optarg;
563 break;
564 case 'r':
565 cpu_running_mark = atoi(optarg);
566 if (cpu_running_mark <= 0 || cpu_running_mark > 100) {
567 warnx("%d is not a valid percent",
568 cpu_running_mark);
569 usage();
570 }
571 break;
572 case 'v':
573 vflag = 1;
574 break;
575 default:
576 usage();
577 }
578
579 mode = mode_none;
580
581 /* Poll interval is in units of ms. */
582 poll_ival *= 1000;
583
584 /* Look up various sysctl MIBs. */
585 len = 2;
586 if (sysctlnametomib("kern.cp_times", cp_times_mib, &len))
587 err(1, "lookup kern.cp_times");
588 len = 4;
589 if (sysctlnametomib("dev.cpu.0.freq", freq_mib, &len))
590 err(EX_UNAVAILABLE, "no cpufreq(4) support -- aborting");
591 len = 4;
592 if (sysctlnametomib("dev.cpu.0.freq_levels", levels_mib, &len))
593 err(1, "lookup freq_levels");
594
595 /* Check if we can read the load and supported freqs. */
596 if (read_usage_times(NULL, nonice))
597 err(1, "read_usage_times");
598 if (read_freqs(&numfreqs, &freqs, &mwatts, minfreq, maxfreq))
599 err(1, "error reading supported CPU frequencies");
600 if (numfreqs == 0)
601 errx(1, "no CPU frequencies in user-specified range");
602
603 /* Run in the background unless in verbose mode. */
604 if (!vflag) {
605 pid_t otherpid;
606
607 pfh = pidfile_open(pidfile, 0600, &otherpid);
608 if (pfh == NULL) {
609 if (errno == EEXIST) {
610 errx(1, "powerd already running, pid: %d",
611 otherpid);
612 }
613 warn("cannot open pid file");
614 }
615 if (daemon(0, 0) != 0) {
616 warn("cannot enter daemon mode, exiting");
617 pidfile_remove(pfh);
618 exit(EXIT_FAILURE);
619
620 }
621 pidfile_write(pfh);
622 }
623
624 /* Decide whether to use ACPI or APM to read the AC line status. */
625 acline_init();
626
627 /*
628 * Exit cleanly on signals.
629 */
630 signal(SIGINT, handle_sigs);
631 signal(SIGTERM, handle_sigs);
632
633 freq = initfreq = curfreq = get_freq();
634 i = get_freq_id(curfreq, freqs, numfreqs);
635 if (freq < 1)
636 freq = 1;
637
638 /*
639 * If we are in adaptive mode and the current frequency is outside the
640 * user-defined range, adjust it to be within the user-defined range.
641 */
642 acline_read();
643 if (acline_status > SRC_UNKNOWN)
644 errx(1, "invalid AC line status %d", acline_status);
645 if ((acline_status == SRC_AC &&
646 (mode_ac == MODE_ADAPTIVE || mode_ac == MODE_HIADAPTIVE)) ||
647 (acline_status == SRC_BATTERY &&
648 (mode_battery == MODE_ADAPTIVE || mode_battery == MODE_HIADAPTIVE)) ||
649 (acline_status == SRC_UNKNOWN &&
650 (mode_none == MODE_ADAPTIVE || mode_none == MODE_HIADAPTIVE))) {
651 /* Read the current frequency. */
652 len = sizeof(curfreq);
653 if (sysctl(freq_mib, 4, &curfreq, &len, NULL, 0) != 0) {
654 if (vflag)
655 warn("error reading current CPU frequency");
656 }
657 if (curfreq < freqs[numfreqs - 1]) {
658 if (vflag) {
659 printf("CPU frequency is below user-defined "
660 "minimum; changing frequency to %d "
661 "MHz\n", freqs[numfreqs - 1]);
662 }
663 if (set_freq(freqs[numfreqs - 1]) != 0) {
664 warn("error setting CPU freq %d",
665 freqs[numfreqs - 1]);
666 }
667 } else if (curfreq > freqs[0]) {
668 if (vflag) {
669 printf("CPU frequency is above user-defined "
670 "maximum; changing frequency to %d "
671 "MHz\n", freqs[0]);
672 }
673 if (set_freq(freqs[0]) != 0) {
674 warn("error setting CPU freq %d",
675 freqs[0]);
676 }
677 }
678 }
679
680 idle = 0;
681 /* Main loop. */
682 for (;;) {
683 FD_ZERO(&fdset);
684 if (devd_pipe >= 0) {
685 FD_SET(devd_pipe, &fdset);
686 nfds = devd_pipe + 1;
687 } else {
688 nfds = 0;
689 }
690 if (mode == MODE_HIADAPTIVE || idle < 120)
691 to = poll_ival;
692 else if (idle < 360)
693 to = poll_ival * 2;
694 else
695 to = poll_ival * 4;
696 timeout.tv_sec = to / 1000000;
697 timeout.tv_usec = to % 1000000;
698 select(nfds, &fdset, NULL, &fdset, &timeout);
699
700 /* If the user requested we quit, print some statistics. */
701 if (exit_requested) {
702 if (vflag && mjoules_used != 0)
703 printf("total joules used: %u.%03u\n",
704 (u_int)(mjoules_used / 1000),
705 (int)mjoules_used % 1000);
706 break;
707 }
708
709 /* Read the current AC status and record the mode. */
710 acline_read();
711 switch (acline_status) {
712 case SRC_AC:
713 mode = mode_ac;
714 break;
715 case SRC_BATTERY:
716 mode = mode_battery;
717 break;
718 case SRC_UNKNOWN:
719 mode = mode_none;
720 break;
721 default:
722 errx(1, "invalid AC line status %d", acline_status);
723 }
724
725 /* Read the current frequency. */
726 if (idle % 32 == 0) {
727 if ((curfreq = get_freq()) == 0)
728 continue;
729 i = get_freq_id(curfreq, freqs, numfreqs);
730 }
731 idle++;
732 if (vflag) {
733 /* Keep a sum of all power actually used. */
734 if (mwatts[i] != -1)
735 mjoules_used +=
736 (mwatts[i] * (poll_ival / 1000)) / 1000;
737 }
738
739 /* Always switch to the lowest frequency in min mode. */
740 if (mode == MODE_MIN) {
741 freq = freqs[numfreqs - 1];
742 if (curfreq != freq) {
743 if (vflag) {
744 printf("now operating on %s power; "
745 "changing frequency to %d MHz\n",
746 modes[acline_status], freq);
747 }
748 idle = 0;
749 if (set_freq(freq) != 0) {
750 warn("error setting CPU freq %d",
751 freq);
752 continue;
753 }
754 }
755 continue;
756 }
757
758 /* Always switch to the highest frequency in max mode. */
759 if (mode == MODE_MAX) {
760 freq = freqs[0];
761 if (curfreq != freq) {
762 if (vflag) {
763 printf("now operating on %s power; "
764 "changing frequency to %d MHz\n",
765 modes[acline_status], freq);
766 }
767 idle = 0;
768 if (set_freq(freq) != 0) {
769 warn("error setting CPU freq %d",
770 freq);
771 continue;
772 }
773 }
774 continue;
775 }
776
777 /* Adaptive mode; get the current CPU usage times. */
778 if (read_usage_times(&load, nonice)) {
779 if (vflag)
780 warn("read_usage_times() failed");
781 continue;
782 }
783
784 if (mode == MODE_ADAPTIVE) {
785 if (load > cpu_running_mark) {
786 if (load > 95 || load > cpu_running_mark * 2)
787 freq *= 2;
788 else
789 freq = freq * load / cpu_running_mark;
790 if (freq > freqs[0])
791 freq = freqs[0];
792 } else if (load < cpu_idle_mark &&
793 curfreq * load < freqs[get_freq_id(
794 freq * 7 / 8, freqs, numfreqs)] *
795 cpu_running_mark) {
796 freq = freq * 7 / 8;
797 if (freq < freqs[numfreqs - 1])
798 freq = freqs[numfreqs - 1];
799 }
800 } else { /* MODE_HIADAPTIVE */
801 if (load > cpu_running_mark / 2) {
802 if (load > 95 || load > cpu_running_mark)
803 freq *= 4;
804 else
805 freq = freq * load * 2 / cpu_running_mark;
806 if (freq > freqs[0] * 2)
807 freq = freqs[0] * 2;
808 } else if (load < cpu_idle_mark / 2 &&
809 curfreq * load < freqs[get_freq_id(
810 freq * 31 / 32, freqs, numfreqs)] *
811 cpu_running_mark / 2) {
812 freq = freq * 31 / 32;
813 if (freq < freqs[numfreqs - 1])
814 freq = freqs[numfreqs - 1];
815 }
816 }
817 if (vflag) {
818 printf("load %3d%%, current freq %4d MHz (%2d), wanted freq %4d MHz\n",
819 load, curfreq, i, freq);
820 }
821 j = get_freq_id(freq, freqs, numfreqs);
822 if (i != j) {
823 if (vflag) {
824 printf("changing clock"
825 " speed from %d MHz to %d MHz\n",
826 freqs[i], freqs[j]);
827 }
828 idle = 0;
829 if (set_freq(freqs[j]))
830 warn("error setting CPU frequency %d",
831 freqs[j]);
832 }
833 }
834 if (set_freq(initfreq))
835 warn("error setting CPU frequency %d", initfreq);
836 free(freqs);
837 free(mwatts);
838 devd_close();
839 if (!vflag)
840 pidfile_remove(pfh);
841
842 exit(0);
843 }
844