freebsd-dev/usr.sbin/powerd/powerd.c
2006-02-19 00:40:28 +00:00

629 lines
14 KiB
C

/*-
* Copyright (c) 2004 Colin Percival
* Copyright (c) 2005 Nate Lawson
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted providing that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/sysctl.h>
#include <sys/resource.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/un.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <libutil.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#ifdef USE_APM
#include <machine/apm_bios.h>
#endif
#define DEFAULT_ACTIVE_PERCENT 65
#define DEFAULT_IDLE_PERCENT 90
#define DEFAULT_POLL_INTERVAL 500 /* Poll interval in milliseconds */
typedef enum {
MODE_MIN,
MODE_ADAPTIVE,
MODE_MAX,
} modes_t;
typedef enum {
SRC_AC,
SRC_BATTERY,
SRC_UNKNOWN,
} power_src_t;
const char *modes[] = {
"AC",
"battery",
"unknown"
};
#define ACPIAC "hw.acpi.acline"
#define APMDEV "/dev/apm"
#define DEVDPIPE "/var/run/devd.pipe"
#define DEVCTL_MAXBUF 1024
static int read_usage_times(long *idle, long *total);
static int read_freqs(int *numfreqs, int **freqs, int **power);
static int set_freq(int freq);
static void acline_init(void);
static void acline_read(void);
static int devd_init(void);
static void devd_close(void);
static void handle_sigs(int sig);
static void parse_mode(char *arg, int *mode, int ch);
static void usage(void);
/* Sysctl data structures. */
static int cp_time_mib[2];
static int freq_mib[4];
static int levels_mib[4];
static int acline_mib[3];
/* Configuration */
static int cpu_running_mark;
static int cpu_idle_mark;
static int poll_ival;
static int vflag;
static volatile sig_atomic_t exit_requested;
static power_src_t acline_status;
static enum {
ac_none,
ac_acpi_sysctl,
ac_acpi_devd,
#ifdef USE_APM
ac_apm,
#endif
} acline_mode;
#ifdef USE_APM
static int apm_fd = -1;
#endif
static int devd_pipe = -1;
#define DEVD_RETRY_INTERVAL 60 /* seconds */
static struct timeval tried_devd;
static int
read_usage_times(long *idle, long *total)
{
static long idle_old, total_old;
long cp_time[CPUSTATES], i, total_new;
size_t cp_time_len;
int error;
cp_time_len = sizeof(cp_time);
error = sysctl(cp_time_mib, 2, cp_time, &cp_time_len, NULL, 0);
if (error)
return (error);
for (total_new = 0, i = 0; i < CPUSTATES; i++)
total_new += cp_time[i];
if (idle)
*idle = cp_time[CP_IDLE] - idle_old;
if (total)
*total = total_new - total_old;
idle_old = cp_time[CP_IDLE];
total_old = total_new;
return (0);
}
static int
read_freqs(int *numfreqs, int **freqs, int **power)
{
char *freqstr, *p, *q;
int i;
size_t len = 0;
if (sysctl(levels_mib, 4, NULL, &len, NULL, 0))
return (-1);
if ((freqstr = malloc(len)) == NULL)
return (-1);
if (sysctl(levels_mib, 4, freqstr, &len, NULL, 0))
return (-1);
*numfreqs = 1;
for (p = freqstr; *p != '\0'; p++)
if (*p == ' ')
(*numfreqs)++;
if ((*freqs = malloc(*numfreqs * sizeof(int))) == NULL) {
free(freqstr);
return (-1);
}
if ((*power = malloc(*numfreqs * sizeof(int))) == NULL) {
free(freqstr);
free(*freqs);
return (-1);
}
for (i = 0, p = freqstr; i < *numfreqs; i++) {
q = strchr(p, ' ');
if (q != NULL)
*q = '\0';
if (sscanf(p, "%d/%d", &(*freqs)[i], &(*power)[i]) != 2) {
free(freqstr);
free(*freqs);
free(*power);
return (-1);
}
p = q + 1;
}
free(freqstr);
return (0);
}
static int
set_freq(int freq)
{
if (sysctl(freq_mib, 4, NULL, NULL, &freq, sizeof(freq))) {
if (errno != EPERM)
return (-1);
}
return (0);
}
/*
* Try to use ACPI to find the AC line status. If this fails, fall back
* to APM. If nothing succeeds, we'll just run in default mode.
*/
static void
acline_init()
{
size_t len;
len = 3;
if (sysctlnametomib(ACPIAC, acline_mib, &len) == 0) {
acline_mode = ac_acpi_sysctl;
if (vflag)
warnx("using sysctl for AC line status");
#ifdef USE_APM
} else if ((apm_fd = open(APMDEV, O_RDONLY)) >= 0) {
if (vflag)
warnx("using APM for AC line status");
acline_mode = ac_apm;
#endif
} else {
warnx("unable to determine AC line status");
acline_mode = ac_none;
}
}
static void
acline_read(void)
{
if (acline_mode == ac_acpi_devd) {
char buf[DEVCTL_MAXBUF], *ptr;
ssize_t rlen;
int notify;
rlen = read(devd_pipe, buf, sizeof(buf));
if (rlen == 0 || (rlen < 0 && errno != EWOULDBLOCK)) {
if (vflag)
warnx("lost devd connection, switching to sysctl");
devd_close();
acline_mode = ac_acpi_sysctl;
/* FALLTHROUGH */
}
if (rlen > 0 &&
(ptr = strstr(buf, "system=ACPI")) != NULL &&
(ptr = strstr(ptr, "subsystem=ACAD")) != NULL &&
(ptr = strstr(ptr, "notify=")) != NULL &&
sscanf(ptr, "notify=%x", &notify) == 1)
acline_status = (notify ? SRC_AC : SRC_BATTERY);
}
if (acline_mode == ac_acpi_sysctl) {
int acline;
size_t len;
len = sizeof(acline);
if (sysctl(acline_mib, 3, &acline, &len, NULL, 0) == 0)
acline_status = (acline ? SRC_AC : SRC_BATTERY);
else
acline_status = SRC_UNKNOWN;
}
#ifdef USE_APM
if (acline_mode == ac_apm) {
struct apm_info info;
if (ioctl(apm_fd, APMIO_GETINFO, &info) == 0) {
acline_status = (info.ai_acline ? SRC_AC : SRC_BATTERY);
} else {
close(apm_fd);
apm_fd = -1;
acline_mode = ac_none;
acline_status = SRC_UNKNOWN;
}
}
#endif
/* try to (re)connect to devd */
if (acline_mode == ac_acpi_sysctl) {
struct timeval now;
gettimeofday(&now, NULL);
if (now.tv_sec > tried_devd.tv_sec + DEVD_RETRY_INTERVAL) {
if (devd_init() >= 0) {
if (vflag)
warnx("using devd for AC line status");
acline_mode = ac_acpi_devd;
}
tried_devd = now;
}
}
}
static int
devd_init(void)
{
struct sockaddr_un devd_addr;
bzero(&devd_addr, sizeof(devd_addr));
if ((devd_pipe = socket(PF_LOCAL, SOCK_STREAM, 0)) < 0) {
if (vflag)
warn("%s(): socket()", __func__);
return (-1);
}
devd_addr.sun_family = PF_LOCAL;
strlcpy(devd_addr.sun_path, DEVDPIPE, sizeof(devd_addr.sun_path));
if (connect(devd_pipe, (struct sockaddr *)&devd_addr,
sizeof(devd_addr)) == -1) {
if (vflag)
warn("%s(): connect()", __func__);
close(devd_pipe);
devd_pipe = -1;
return (-1);
}
if (fcntl(devd_pipe, F_SETFL, O_NONBLOCK) == -1) {
if (vflag)
warn("%s(): fcntl()", __func__);
close(devd_pipe);
return (-1);
}
return (devd_pipe);
}
static void
devd_close(void)
{
close(devd_pipe);
devd_pipe = -1;
}
static void
parse_mode(char *arg, int *mode, int ch)
{
if (strcmp(arg, "minimum") == 0 || strcmp(arg, "min") == 0)
*mode = MODE_MIN;
else if (strcmp(arg, "maximum") == 0 || strcmp(arg, "max") == 0)
*mode = MODE_MAX;
else if (strcmp(arg, "adaptive") == 0)
*mode = MODE_ADAPTIVE;
else
errx(1, "bad option: -%c %s", (char)ch, optarg);
}
static void
handle_sigs(int __unused sig)
{
exit_requested = 1;
}
static void
usage(void)
{
fprintf(stderr,
"usage: powerd [-v] [-a mode] [-b mode] [-i %%] [-n mode] [-p ival] [-r %%] [-P pidfile]\n");
exit(1);
}
int
main(int argc, char * argv[])
{
struct timeval timeout;
fd_set fdset;
int nfds;
struct pidfh *pfh = NULL;
const char *pidfile = NULL;
long idle, total;
int curfreq, *freqs, i, *mwatts, numfreqs;
int ch, mode, mode_ac, mode_battery, mode_none;
uint64_t mjoules_used;
size_t len;
/* Default mode for all AC states is adaptive. */
mode_ac = mode_battery = mode_none = MODE_ADAPTIVE;
cpu_running_mark = DEFAULT_ACTIVE_PERCENT;
cpu_idle_mark = DEFAULT_IDLE_PERCENT;
poll_ival = DEFAULT_POLL_INTERVAL;
mjoules_used = 0;
vflag = 0;
/* User must be root to control frequencies. */
if (geteuid() != 0)
errx(1, "must be root to run");
while ((ch = getopt(argc, argv, "a:b:i:n:p:P:r:v")) != EOF)
switch (ch) {
case 'a':
parse_mode(optarg, &mode_ac, ch);
break;
case 'b':
parse_mode(optarg, &mode_battery, ch);
break;
case 'i':
cpu_idle_mark = atoi(optarg);
if (cpu_idle_mark < 0 || cpu_idle_mark > 100) {
warnx("%d is not a valid percent",
cpu_idle_mark);
usage();
}
break;
case 'n':
parse_mode(optarg, &mode_none, ch);
break;
case 'p':
poll_ival = atoi(optarg);
if (poll_ival < 5) {
warnx("poll interval is in units of ms");
usage();
}
break;
case 'P':
pidfile = optarg;
break;
case 'r':
cpu_running_mark = atoi(optarg);
if (cpu_running_mark < 0 || cpu_running_mark > 100) {
warnx("%d is not a valid percent",
cpu_running_mark);
usage();
}
break;
case 'v':
vflag = 1;
break;
default:
usage();
}
mode = mode_none;
/* Poll interval is in units of ms. */
poll_ival *= 1000;
/* Look up various sysctl MIBs. */
len = 2;
if (sysctlnametomib("kern.cp_time", cp_time_mib, &len))
err(1, "lookup kern.cp_time");
len = 4;
if (sysctlnametomib("dev.cpu.0.freq", freq_mib, &len))
err(1, "lookup freq");
len = 4;
if (sysctlnametomib("dev.cpu.0.freq_levels", levels_mib, &len))
err(1, "lookup freq_levels");
/* Check if we can read the idle time and supported freqs. */
if (read_usage_times(NULL, NULL))
err(1, "read_usage_times");
if (read_freqs(&numfreqs, &freqs, &mwatts))
err(1, "error reading supported CPU frequencies");
/* Run in the background unless in verbose mode. */
if (!vflag) {
pid_t otherpid;
pfh = pidfile_open(pidfile, 0600, &otherpid);
if (pfh == NULL) {
if (errno == EEXIST) {
errx(1, "powerd already running, pid: %d",
otherpid);
}
warn("cannot open pid file");
}
if (daemon(0, 0) != 0) {
warn("cannot enter daemon mode, exiting");
pidfile_remove(pfh);
exit(EXIT_FAILURE);
}
pidfile_write(pfh);
}
/* Decide whether to use ACPI or APM to read the AC line status. */
acline_init();
/*
* Exit cleanly on signals.
*/
signal(SIGINT, handle_sigs);
signal(SIGTERM, handle_sigs);
/* Main loop. */
for (;;) {
FD_ZERO(&fdset);
if (devd_pipe >= 0) {
FD_SET(devd_pipe, &fdset);
nfds = devd_pipe + 1;
} else {
nfds = 0;
}
timeout.tv_sec = poll_ival / 1000000;
timeout.tv_usec = poll_ival % 1000000;
select(nfds, &fdset, NULL, &fdset, &timeout);
/* If the user requested we quit, print some statistics. */
if (exit_requested) {
if (vflag && mjoules_used != 0)
printf("total joules used: %u.%03u\n",
(u_int)(mjoules_used / 1000),
(int)mjoules_used % 1000);
break;
}
/* Read the current AC status and record the mode. */
acline_read();
switch (acline_status) {
case SRC_AC:
mode = mode_ac;
break;
case SRC_BATTERY:
mode = mode_battery;
break;
case SRC_UNKNOWN:
mode = mode_none;
break;
default:
errx(1, "invalid AC line status %d", acline_status);
}
/* Read the current frequency. */
len = sizeof(curfreq);
if (sysctl(freq_mib, 4, &curfreq, &len, NULL, 0) != 0) {
if (vflag)
warn("error reading current CPU frequency");
continue;
}
if (vflag) {
for (i = 0; i < numfreqs; i++) {
if (freqs[i] == curfreq)
break;
}
/* Keep a sum of all power actually used. */
if (i < numfreqs && mwatts[i] != -1)
mjoules_used +=
(mwatts[i] * (poll_ival / 1000)) / 1000;
}
/* Always switch to the lowest frequency in min mode. */
if (mode == MODE_MIN) {
if (curfreq != freqs[numfreqs - 1]) {
if (vflag) {
printf("now operating on %s power; "
"changing frequency to %d MHz\n",
modes[acline_status],
freqs[numfreqs - 1]);
}
if (set_freq(freqs[numfreqs - 1]) != 0) {
warn("error setting CPU freq %d",
freqs[numfreqs - 1]);
continue;
}
}
continue;
}
/* Always switch to the highest frequency in max mode. */
if (mode == MODE_MAX) {
if (curfreq != freqs[0]) {
if (vflag) {
printf("now operating on %s power; "
"changing frequency to %d MHz\n",
modes[acline_status],
freqs[0]);
}
if (set_freq(freqs[0]) != 0) {
warn("error setting CPU freq %d",
freqs[0]);
continue;
}
}
continue;
}
/* Adaptive mode; get the current CPU usage times. */
if (read_usage_times(&idle, &total)) {
if (vflag)
warn("read_usage_times() failed");
continue;
}
/*
* If we're idle less than the active mark, bump up two levels.
* If we're idle more than the idle mark, drop down one level.
*/
for (i = 0; i < numfreqs - 1; i++) {
if (freqs[i] == curfreq)
break;
}
if (idle < (total * cpu_running_mark) / 100 &&
curfreq < freqs[0]) {
i -= 2;
if (i < 0)
i = 0;
if (vflag) {
printf("idle time < %d%%, increasing clock"
" speed from %d MHz to %d MHz\n",
cpu_running_mark, curfreq, freqs[i]);
}
if (set_freq(freqs[i]))
err(1, "error setting CPU frequency %d",
freqs[i]);
} else if (idle > (total * cpu_idle_mark) / 100 &&
curfreq > freqs[numfreqs - 1]) {
i++;
if (vflag) {
printf("idle time > %d%%, decreasing clock"
" speed from %d MHz to %d MHz\n",
cpu_idle_mark, curfreq, freqs[i]);
}
if (set_freq(freqs[i]) != 0)
warn("error setting CPU frequency %d",
freqs[i]);
}
}
free(freqs);
free(mwatts);
devd_close();
if (!vflag)
pidfile_remove(pfh);
exit(0);
}