usr.sbin/powerd/powerd.c

   1 /*
   2  * Copyright (c) 2010,2016 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Matthew Dillon <dillon@backplane.com>
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  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
  15  *    the documentation and/or other materials provided with the
  16  *    distribution.
  17  * 3. Neither the name of The DragonFly Project nor the names of its
  18  *    contributors may be used to endorse or promote products derived
  19  *    from this software without specific, prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  24  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  25  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  27  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  28  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  30  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  31  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 /*
  36  * The powerd daemon :
  37  * - Monitor the cpu load and adjusts cpu and cpu power domain
  38  *   performance accordingly.
  39  * - Monitor battery life.  Alarm alerts and shutdown the machine
  40  *   if battery life goes low.
  41  */
  42
  43 #define _KERNEL_STRUCTURES
  44 #include <sys/types.h>
  45 #include <sys/sysctl.h>
  46 #include <sys/kinfo.h>
  47 #include <sys/queue.h>
  48 #include <sys/soundcard.h>
  49 #include <sys/sensors.h>
  50 #include <sys/time.h>
  51 #include <sys/cpumask.h>
  52 #include <machine/cpufunc.h>
  53 #include <err.h>
  54 #include <fcntl.h>
  55 #include <signal.h>
  56 #include <stdio.h>
  57 #include <stdlib.h>
  58 #include <unistd.h>
  59 #include <string.h>
  60 #include <syslog.h>
  61
  62 #include "alert1.h"
  63
  64 #define MAXDOM          MAXCPU  /* worst case, 1 cpu per domain */
  65
  66 #define MAXFREQ         64
  67 #define CST_STRLEN      16
  68
  69 #define NFREQ_MONPERF   0x0001
  70 #define NFREQ_ADJPERF   0x0002
  71 #define NFREQ_CPUTEMP   0x0004
  72
  73 #define NFREQ_ALL       (NFREQ_MONPERF | NFREQ_ADJPERF | NFREQ_CPUTEMP)
  74
  75 struct cpu_pwrdom {
  76         TAILQ_ENTRY(cpu_pwrdom) dom_link;
  77         int                     dom_id;
  78         int                     dom_ncpus;
  79         cpumask_t               dom_cpumask;
  80 };
  81
  82 struct cpu_state {
  83         double                  cpu_qavg;
  84         double                  cpu_uavg;       /* used for speeding up */
  85         double                  cpu_davg;       /* used for slowing down */
  86         int                     cpu_limit;
  87         int                     cpu_count;
  88         char                    cpu_name[8];
  89 };
  90
  91 static void usage(void);
  92 static void get_ncpus(void);
  93 static void mon_cputemp(void);
  94
  95 /* usched cpumask */
  96 static void get_uschedcpus(void);
  97 static void set_uschedcpus(void);
  98
  99 /* perfbias(4) */
 100 static int has_perfbias(void);
 101 static void set_perfbias(int, int);
 102
 103 /* acpi(4) P-state */
 104 static void acpi_getcpufreq_str(int, int *, int *);
 105 static int acpi_getcpufreq_bin(int, int *, int *);
 106 static void acpi_get_cpufreq(int, int *, int *);
 107 static void acpi_set_cpufreq(int, int);
 108 static int acpi_get_cpupwrdom(void);
 109
 110 /* mwait C-state hint */
 111 static int probe_cstate(void);
 112 static void set_cstate(int, int);
 113
 114 /* Performance monitoring */
 115 static void init_perf(void);
 116 static void mon_perf(double);
 117 static void adj_perf(cpumask_t, cpumask_t);
 118 static void adj_cpu_pwrdom(int, int);
 119 static void adj_cpu_perf(int, int);
 120 static void get_cputime(double);
 121 static int get_nstate(struct cpu_state *, double);
 122 static void add_spare_cpus(const cpumask_t, int);
 123 static void restore_perf(void);
 124 static void set_global_freq(int freq);
 125
 126 /* Battery monitoring */
 127 static int has_battery(void);
 128 static int mon_battery(void);
 129 static void low_battery_alert(int);
 130
 131 /* Backlight */
 132 static void restore_backlight(void);
 133
 134 /* Runtime states for performance monitoring */
 135 static int global_pcpu_limit;
 136 static struct cpu_state pcpu_state[MAXCPU];
 137 static struct cpu_state global_cpu_state;
 138 static cpumask_t cpu_used;              /* cpus w/ high perf */
 139 static cpumask_t cpu_pwrdom_used;       /* cpu power domains w/ high perf */
 140 static cpumask_t usched_cpu_used;       /* cpus for usched */
 141
 142 /* Constants */
 143 static cpumask_t cpu_pwrdom_mask;       /* usable cpu power domains */
 144 static int cpu2pwrdom[MAXCPU];          /* cpu to cpu power domain map */
 145 static struct cpu_pwrdom *cpu_pwrdomain[MAXDOM];
 146 static int NCpus;                       /* # of cpus */
 147 static char orig_global_cx[CST_STRLEN];
 148 static char cpu_perf_cx[CST_STRLEN];
 149 static int cpu_perf_cxlen;
 150 static char cpu_idle_cx[CST_STRLEN];
 151 static int cpu_idle_cxlen;
 152 static int FreqAry[MAXFREQ];
 153 static int NFreq;
 154 static int NFreqChanged = NFREQ_ALL;
 155 static int SavedPXGlobal;
 156
 157 static int DebugOpt;
 158 static int TurboOpt = 1;
 159 static int PowerFd;
 160 static int Hysteresis = 10;     /* percentage */
 161 static double TriggerUp = 0.25; /* single-cpu load to force max freq */
 162 static double TriggerDown;      /* load per cpu to force the min freq */
 163 static int HasPerfbias = 0;
 164 static int AdjustCpuFreq = 1;
 165 static int AdjustCstate = 0;
 166 static int HighestCpuFreq;
 167 static int LowestCpuFreq;
 168 static int AdjustUsched = 1;
 169
 170 static int AdjustCpuFreqOverride;
 171
 172 static volatile int stopped;
 173
 174 /* Battery life monitoring */
 175 static int BatLifeMin = 2;      /* shutdown the box, if low on battery life */
 176 static struct timespec BatLifePrevT;
 177 static int BatLifePollIntvl = 5; /* unit: sec */
 178 static struct timespec BatShutdownStartT;
 179 static int BatShutdownLinger = -1;
 180 static int BatShutdownLingerSet = 60; /* unit: sec */
 181 static int BatShutdownLingerCnt;
 182 static int BatShutdownAudioAlert = 1;
 183 static int MinTemp = 75;
 184 static int MaxTemp = 85;
 185 static int BackLightPct = 100;
 186 static int OldBackLightLevel;
 187 static int BackLightDown;
 188
 189 static void sigintr(int signo);
 190
 191 int
 192 main(int ac, char **av)
 193 {
 194         double srt;
 195         double pollrate;
 196         int ch;
 197         int lowest;
 198         int highest;
 199         char buf[64];
 200         int monbat;
 201         char *p2;
 202
 203         srt = 8.0;      /* time for samples - 8 seconds */
 204         pollrate = 1.0; /* polling rate in seconds */
 205
 206         while ((ch = getopt(ac, av, "b:cdefh:l:p:r:tu:B:H:L:P:QT:U")) != -1) {
 207                 switch(ch) {
 208                 case 'b':
 209                         BackLightPct = strtol(optarg, NULL, 10);
 210                         break;
 211                 case 'c':
 212                         AdjustCstate = 1;
 213                         break;
 214                 case 'd':
 215                         DebugOpt = 1;
 216                         break;
 217                 case 'e':
 218                         HasPerfbias = 1;
 219                         break;
 220                 case 'f':
 221                         AdjustCpuFreq = 0;
 222                         break;
 223                 case 'h':
 224                         HighestCpuFreq = strtol(optarg, NULL, 10);
 225                         break;
 226                 case 'l':
 227                         LowestCpuFreq = strtol(optarg, NULL, 10);
 228                         break;
 229                 case 'p':
 230                         Hysteresis = (int)strtol(optarg, NULL, 10);
 231                         break;
 232                 case 'r':
 233                         pollrate = strtod(optarg, NULL);
 234                         break;
 235                 case 't':
 236                         TurboOpt = 0;
 237                         break;
 238                 case 'u':
 239                         TriggerUp = (double)strtol(optarg, NULL, 10) / 100;
 240                         break;
 241                 case 'B':
 242                         BatLifeMin = strtol(optarg, NULL, 10);
 243                         break;
 244                 case 'H':
 245                         MaxTemp = strtol(optarg, &p2, 0);
 246                         if (*p2 == ':') {
 247                                 MinTemp = MaxTemp;
 248                                 MaxTemp = strtol(p2 + 1, NULL, 0);
 249                         } else {
 250                                 MinTemp = MaxTemp * 9 / 10;
 251                         }
 252                         break;
 253                 case 'L':
 254                         BatShutdownLingerSet = strtol(optarg, NULL, 10);
 255                         if (BatShutdownLingerSet < 0)
 256                                 BatShutdownLingerSet = 0;
 257                         break;
 258                 case 'P':
 259                         BatLifePollIntvl = strtol(optarg, NULL, 10);
 260                         break;
 261                 case 'Q':
 262                         BatShutdownAudioAlert = 0;
 263                         break;
 264                 case 'T':
 265                         srt = strtod(optarg, NULL);
 266                         break;
 267                 case 'U':
 268                         AdjustUsched = 0;
 269                         break;
 270                 default:
 271                         usage();
 272                         /* NOT REACHED */
 273                 }
 274         }
 275         ac -= optind;
 276         av += optind;
 277
 278         setlinebuf(stdout);
 279
 280         /* Get number of cpus */
 281         get_ncpus();
 282
 283         /* Seed FreqAry[] */
 284         acpi_get_cpufreq(0, &lowest, &highest);
 285
 286         if (Hysteresis < 0 || Hysteresis > 99) {
 287                 fprintf(stderr, "Invalid hysteresis value\n");
 288                 exit(1);
 289         }
 290
 291         if (TriggerUp < 0 || TriggerUp > 1) {
 292                 fprintf(stderr, "Invalid load limit value\n");
 293                 exit(1);
 294         }
 295
 296         if (BackLightPct > 100 || BackLightPct <= 0) {
 297                 fprintf(stderr, "Invalid backlight setting, ignore\n");
 298                 BackLightPct = 100;
 299         }
 300
 301         TriggerDown = TriggerUp - (TriggerUp * (double) Hysteresis / 100);
 302
 303         /*
 304          * Make sure powerd is not already running.
 305          */
 306         PowerFd = open("/var/run/powerd.pid", O_CREAT|O_RDWR, 0644);
 307         if (PowerFd < 0) {
 308                 fprintf(stderr,
 309                         "Cannot create /var/run/powerd.pid, "
 310                         "continuing anyway\n");
 311         } else {
 312                 ssize_t r;
 313                 pid_t pid = -1;
 314
 315                 r = read(PowerFd, buf, sizeof(buf) - 1);
 316                 if (r > 0) {
 317                         buf[r] = 0;
 318                         pid = strtol(buf, NULL, 0);
 319                 }
 320                 if (flock(PowerFd, LOCK_EX|LOCK_NB) < 0) {
 321                         if (pid > 0) {
 322                                 kill(pid, SIGTERM);
 323                                 flock(PowerFd, LOCK_EX);
 324                                 fprintf(stderr, "restarting powerd\n");
 325                         } else {
 326                                 fprintf(stderr,
 327                                         "powerd is already running, "
 328                                         "unable to kill pid for restart\n");
 329                                 exit(1);
 330                         }
 331                 }
 332                 lseek(PowerFd, 0L, 0);
 333         }
 334
 335         /*
 336          * Demonize and set pid
 337          */
 338         if (DebugOpt == 0) {
 339                 daemon(0, 0);
 340                 openlog("powerd", LOG_CONS | LOG_PID, LOG_DAEMON);
 341         }
 342
 343         if (PowerFd >= 0) {
 344                 ftruncate(PowerFd, 0);
 345                 snprintf(buf, sizeof(buf), "%d\n", (int)getpid());
 346                 write(PowerFd, buf, strlen(buf));
 347         }
 348
 349         /* Do we need to monitor battery life? */
 350         if (BatLifePollIntvl <= 0)
 351                 monbat = 0;
 352         else
 353                 monbat = has_battery();
 354
 355         /* Do we have perfbias(4)? */
 356         if (HasPerfbias)
 357                 HasPerfbias = has_perfbias();
 358
 359         /* Could we adjust C-state? */
 360         if (AdjustCstate)
 361                 AdjustCstate = probe_cstate();
 362
 363         /*
 364          * Wait hw.acpi.cpu.px_dom* sysctl to be created by kernel.
 365          *
 366          * Since hw.acpi.cpu.px_dom* creation is queued into ACPI
 367          * taskqueue and ACPI taskqueue is shared across various
 368          * ACPI modules, any delay in other modules may cause
 369          * hw.acpi.cpu.px_dom* to be created at quite a later time
 370          * (e.g. cmbat module's task could take quite a lot of time).
 371          */
 372         for (;;) {
 373                 /* Prime delta cputime calculation. */
 374                 get_cputime(pollrate);
 375
 376                 /* Wait for all cpus to appear */
 377                 if (acpi_get_cpupwrdom())
 378                         break;
 379                 usleep((int)(pollrate * 1000000.0));
 380         }
 381
 382         /*
 383          * Catch some signals so that max performance could be restored.
 384          */
 385         signal(SIGINT, sigintr);
 386         signal(SIGTERM, sigintr);
 387
 388         /* Initialize performance states */
 389         init_perf();
 390
 391         srt = srt / pollrate;   /* convert to sample count */
 392         if (DebugOpt)
 393                 printf("samples for downgrading: %5.2f\n", srt);
 394
 395         /*
 396          * Monitoring loop
 397          */
 398         while (!stopped) {
 399                 /*
 400                  * Monitor performance
 401                  */
 402                 get_cputime(pollrate);
 403                 mon_cputemp();
 404                 mon_perf(srt);
 405
 406                 /*
 407                  * Monitor battery
 408                  */
 409                 if (monbat)
 410                         monbat = mon_battery();
 411
 412                 usleep((int)(pollrate * 1000000.0));
 413         }
 414
 415         /*
 416          * Set to maximum performance if killed.
 417          */
 418         syslog(LOG_INFO, "killed, setting max and exiting");
 419         if (SavedPXGlobal)
 420                 set_global_freq(SavedPXGlobal);
 421         restore_perf();
 422         restore_backlight();
 423
 424         exit(0);
 425 }
 426
 427 static void
 428 sigintr(int signo __unused)
 429 {
 430         stopped = 1;
 431 }
 432
 433 /*
 434  * Figure out the cpu power domains.
 435  */
 436 static int
 437 acpi_get_cpupwrdom(void)
 438 {
 439         struct cpu_pwrdom *dom;
 440         cpumask_t pwrdom_mask;
 441         char buf[64];
 442         char members[1024];
 443         char *str;
 444         size_t msize;
 445         int n, i, ncpu = 0, dom_id;
 446
 447         memset(cpu2pwrdom, 0, sizeof(cpu2pwrdom));
 448         memset(cpu_pwrdomain, 0, sizeof(cpu_pwrdomain));
 449         CPUMASK_ASSZERO(cpu_pwrdom_mask);
 450
 451         for (i = 0; i < MAXDOM; ++i) {
 452                 snprintf(buf, sizeof(buf),
 453                          "hw.acpi.cpu.px_dom%d.available", i);
 454                 if (sysctlbyname(buf, NULL, NULL, NULL, 0) < 0)
 455                         continue;
 456
 457                 dom = calloc(1, sizeof(*dom));
 458                 dom->dom_id = i;
 459
 460                 if (cpu_pwrdomain[i] != NULL) {
 461                         fprintf(stderr, "cpu power domain %d exists\n", i);
 462                         exit(1);
 463                 }
 464                 cpu_pwrdomain[i] = dom;
 465                 CPUMASK_ORBIT(cpu_pwrdom_mask, i);
 466         }
 467         pwrdom_mask = cpu_pwrdom_mask;
 468
 469         while (CPUMASK_TESTNZERO(pwrdom_mask)) {
 470                 dom_id = BSFCPUMASK(pwrdom_mask);
 471                 CPUMASK_NANDBIT(pwrdom_mask, dom_id);
 472                 dom = cpu_pwrdomain[dom_id];
 473
 474                 CPUMASK_ASSZERO(dom->dom_cpumask);
 475
 476                 snprintf(buf, sizeof(buf),
 477                          "hw.acpi.cpu.px_dom%d.members", dom->dom_id);
 478                 msize = sizeof(members);
 479                 if (sysctlbyname(buf, members, &msize, NULL, 0) < 0) {
 480                         cpu_pwrdomain[dom_id] = NULL;
 481                         free(dom);
 482                         continue;
 483                 }
 484
 485                 members[msize] = 0;
 486                 for (str = strtok(members, " "); str; str = strtok(NULL, " ")) {
 487                         n = -1;
 488                         sscanf(str, "cpu%d", &n);
 489                         if (n >= 0) {
 490                                 ++ncpu;
 491                                 ++dom->dom_ncpus;
 492                                 CPUMASK_ORBIT(dom->dom_cpumask, n);
 493                                 cpu2pwrdom[n] = dom->dom_id;
 494                         }
 495                 }
 496                 if (dom->dom_ncpus == 0) {
 497                         cpu_pwrdomain[dom_id] = NULL;
 498                         free(dom);
 499                         continue;
 500                 }
 501                 if (DebugOpt) {
 502                         printf("dom%d cpumask: ", dom->dom_id);
 503                         for (i = 0; i < (int)NELEM(dom->dom_cpumask.ary); ++i) {
 504                                 printf("%jx ",
 505                                     (uintmax_t)dom->dom_cpumask.ary[i]);
 506                         }
 507                         printf("\n");
 508                 }
 509         }
 510
 511         if (ncpu != NCpus) {
 512                 if (DebugOpt)
 513                         printf("Found %d cpus, expecting %d\n", ncpu, NCpus);
 514
 515                 pwrdom_mask = cpu_pwrdom_mask;
 516                 while (CPUMASK_TESTNZERO(pwrdom_mask)) {
 517                         dom_id = BSFCPUMASK(pwrdom_mask);
 518                         CPUMASK_NANDBIT(pwrdom_mask, dom_id);
 519                         dom = cpu_pwrdomain[dom_id];
 520                         if (dom != NULL)
 521                                 free(dom);
 522                 }
 523                 return 0;
 524         }
 525         return 1;
 526 }
 527
 528 /*
 529  * Save per-cpu load and sum of per-cpu load.
 530  */
 531 static void
 532 get_cputime(double pollrate)
 533 {
 534         static struct kinfo_cputime ocpu_time[MAXCPU];
 535         static struct kinfo_cputime ncpu_time[MAXCPU];
 536         size_t slen;
 537         int ncpu;
 538         int cpu;
 539         uint64_t delta;
 540
 541         bcopy(ncpu_time, ocpu_time, sizeof(struct kinfo_cputime) * NCpus);
 542
 543         slen = sizeof(ncpu_time);
 544         if (sysctlbyname("kern.cputime", &ncpu_time, &slen, NULL, 0) < 0) {
 545                 fprintf(stderr, "kern.cputime sysctl not available\n");
 546                 exit(1);
 547         }
 548         ncpu = slen / sizeof(ncpu_time[0]);
 549
 550         delta = 0;
 551         for (cpu = 0; cpu < ncpu; ++cpu) {
 552                 uint64_t d;
 553
 554                 d = (ncpu_time[cpu].cp_user + ncpu_time[cpu].cp_sys +
 555                      ncpu_time[cpu].cp_nice + ncpu_time[cpu].cp_intr) -
 556                     (ocpu_time[cpu].cp_user + ocpu_time[cpu].cp_sys +
 557                      ocpu_time[cpu].cp_nice + ocpu_time[cpu].cp_intr);
 558                 pcpu_state[cpu].cpu_qavg = (double)d / (pollrate * 1000000.0);
 559
 560                 delta += d;
 561         }
 562         global_cpu_state.cpu_qavg = (double)delta / (pollrate * 1000000.0);
 563 }
 564
 565 static void
 566 acpi_getcpufreq_str(int dom_id, int *highest0, int *lowest0)
 567 {
 568         char buf[256], sysid[64];
 569         size_t buflen;
 570         char *ptr;
 571         int v, highest, lowest;
 572         int freqidx;
 573
 574         /*
 575          * Retrieve availability list
 576          */
 577         snprintf(sysid, sizeof(sysid),
 578                  "hw.acpi.cpu.px_dom%d.available", dom_id);
 579         buflen = sizeof(buf) - 1;
 580         if (sysctlbyname(sysid, buf, &buflen, NULL, 0) < 0)
 581                 return;
 582         buf[buflen] = 0;
 583
 584         /*
 585          * Parse out the highest and lowest cpu frequencies
 586          */
 587         ptr = buf;
 588         highest = lowest = 0;
 589         freqidx = 0;
 590         while (ptr && (v = strtol(ptr, &ptr, 10)) > 0) {
 591                 if ((lowest == 0 || lowest > v) &&
 592                     (LowestCpuFreq <= 0 || v >= LowestCpuFreq))
 593                         lowest = v;
 594                 if ((highest == 0 || highest < v) &&
 595                     (HighestCpuFreq <= 0 || v <= HighestCpuFreq))
 596                         highest = v;
 597                 /*
 598                  * Detect turbo mode
 599                  */
 600                 if (!TurboOpt && highest - v == 1)
 601                         highest = v;
 602                 ++freqidx;
 603         }
 604
 605         /*
 606          * Frequency array
 607          */
 608         if (freqidx > MAXFREQ)
 609                 freqidx = MAXFREQ;
 610         if (NFreq != freqidx) {
 611                 NFreq = freqidx;
 612                 NFreqChanged = NFREQ_ALL;
 613         }
 614         ptr = buf;
 615         while (ptr && (v = strtol(ptr, &ptr, 10)) > 0) {
 616                 if (freqidx == 0)
 617                         break;
 618                 if (FreqAry[freqidx - 1] != v)
 619                         NFreqChanged = NFREQ_ALL;
 620                 FreqAry[--freqidx] = v;
 621         }
 622
 623         *highest0 = highest;
 624         *lowest0 = lowest;
 625 }
 626
 627 static int
 628 acpi_getcpufreq_bin(int dom_id, int *highest0, int *lowest0)
 629 {
 630         char sysid[64];
 631         size_t freqlen;
 632         int freqcnt, i;
 633         int freqary[MAXFREQ];
 634
 635         /*
 636          * Retrieve availability list
 637          */
 638         snprintf(sysid, sizeof(sysid), "hw.acpi.cpu.px_dom%d.avail", dom_id);
 639         freqlen = sizeof(FreqAry);
 640         bzero(freqary, sizeof(freqary));
 641         if (sysctlbyname(sysid, freqary, &freqlen, NULL, 0) < 0)
 642                 return 0;
 643
 644         freqcnt = freqlen / sizeof(freqary[0]);
 645         if (NFreq != freqcnt) {
 646                 NFreq = freqcnt;
 647                 NFreqChanged = NFREQ_ALL;
 648         }
 649         if (bcmp(freqary, FreqAry, sizeof(FreqAry)) != 0)
 650                 NFreqChanged = NFREQ_ALL;
 651         bcopy(freqary, FreqAry, sizeof(FreqAry));
 652         if (freqcnt == 0)
 653                 return 0;
 654
 655         for (i = freqcnt - 1; i >= 0; --i) {
 656                 *lowest0 = FreqAry[i];
 657                 if (LowestCpuFreq <= 0 || *lowest0 >= LowestCpuFreq)
 658                         break;
 659         }
 660
 661         i = 0;
 662         *highest0 = FreqAry[0];
 663         if (!TurboOpt && freqcnt > 1 && FreqAry[0] - FreqAry[1] == 1) {
 664                 i = 1;
 665                 *highest0 = FreqAry[1];
 666         }
 667         for (; i < freqcnt; ++i) {
 668                 if (HighestCpuFreq <= 0 || *highest0 <= HighestCpuFreq)
 669                         break;
 670                 *highest0 = FreqAry[i];
 671         }
 672         return 1;
 673 }
 674
 675 static void
 676 acpi_get_cpufreq(int dom_id, int *highest, int *lowest)
 677 {
 678         *highest = 0;
 679         *lowest = 0;
 680
 681         if (acpi_getcpufreq_bin(dom_id, highest, lowest))
 682                 return;
 683         acpi_getcpufreq_str(dom_id, highest, lowest);
 684 }
 685
 686 static
 687 void
 688 usage(void)
 689 {
 690         fprintf(stderr, "usage: powerd [-cdeftQU] [-p hysteresis] "
 691             "[-h highest_freq] [-l lowest_freq] "
 692             "[-r poll_interval] [-u trigger_up] "
 693             "[-B min_battery_life] [-L low_battery_linger] "
 694             "[-P battery_poll_interval] [-T sample_interval] "
 695             "[-b backlight]\n");
 696         exit(1);
 697 }
 698
 699 #define BAT_SYSCTL_TIME_MAX     50000000 /* unit: nanosecond */
 700
 701 static int
 702 has_battery(void)
 703 {
 704         struct timespec s, e;
 705         size_t len;
 706         int val;
 707
 708         clock_gettime(CLOCK_MONOTONIC_FAST, &s);
 709         BatLifePrevT = s;
 710
 711         len = sizeof(val);
 712         if (sysctlbyname("hw.acpi.acline", &val, &len, NULL, 0) < 0) {
 713                 /* No AC line information */
 714                 return 0;
 715         }
 716         clock_gettime(CLOCK_MONOTONIC_FAST, &e);
 717
 718         timespecsub(&e, &s, &e);
 719         if (e.tv_sec > 0 || e.tv_nsec > BAT_SYSCTL_TIME_MAX) {
 720                 /* hw.acpi.acline takes to long to be useful */
 721                 syslog(LOG_NOTICE, "hw.acpi.acline takes too long");
 722                 return 0;
 723         }
 724
 725         clock_gettime(CLOCK_MONOTONIC_FAST, &s);
 726         len = sizeof(val);
 727         if (sysctlbyname("hw.acpi.battery.life", &val, &len, NULL, 0) < 0) {
 728                 /* No battery life */
 729                 return 0;
 730         }
 731         clock_gettime(CLOCK_MONOTONIC_FAST, &e);
 732
 733         timespecsub(&e, &s, &e);
 734         if (e.tv_sec > 0 || e.tv_nsec > BAT_SYSCTL_TIME_MAX) {
 735                 /* hw.acpi.battery.life takes to long to be useful */
 736                 syslog(LOG_NOTICE, "hw.acpi.battery.life takes too long");
 737                 return 0;
 738         }
 739         return 1;
 740 }
 741
 742 static void
 743 low_battery_alert(int life)
 744 {
 745         int fmt, stereo, freq;
 746         int fd;
 747
 748         syslog(LOG_ALERT, "low battery life %d%%, please plugin AC line, #%d",
 749             life, BatShutdownLingerCnt);
 750         ++BatShutdownLingerCnt;
 751
 752         if (!BatShutdownAudioAlert)
 753                 return;
 754
 755         fd = open("/dev/dsp", O_WRONLY);
 756         if (fd < 0)
 757                 return;
 758
 759         fmt = AFMT_S16_LE;
 760         if (ioctl(fd, SNDCTL_DSP_SETFMT, &fmt, sizeof(fmt)) < 0)
 761                 goto done;
 762
 763         stereo = 0;
 764         if (ioctl(fd, SNDCTL_DSP_STEREO, &stereo, sizeof(stereo)) < 0)
 765                 goto done;
 766
 767         freq = 44100;
 768         if (ioctl(fd, SNDCTL_DSP_SPEED, &freq, sizeof(freq)) < 0)
 769                 goto done;
 770
 771         write(fd, alert1, sizeof(alert1));
 772         write(fd, alert1, sizeof(alert1));
 773
 774 done:
 775         close(fd);
 776 }
 777
 778 static int
 779 mon_battery(void)
 780 {
 781         struct timespec cur, ts;
 782         int acline, life;
 783         size_t len;
 784
 785         clock_gettime(CLOCK_MONOTONIC_FAST, &cur);
 786         timespecsub(&cur, &BatLifePrevT, &ts);
 787         if (ts.tv_sec < BatLifePollIntvl)
 788                 return 1;
 789         BatLifePrevT = cur;
 790
 791         len = sizeof(acline);
 792         if (sysctlbyname("hw.acpi.acline", &acline, &len, NULL, 0) < 0)
 793                 return 1;
 794         if (acline) {
 795                 BatShutdownLinger = -1;
 796                 BatShutdownLingerCnt = 0;
 797                 restore_backlight();
 798                 return 1;
 799         }
 800
 801         if (!BackLightDown && BackLightPct != 100) {
 802                 int backlight_max, backlight;
 803
 804                 len = sizeof(backlight_max);
 805                 if (sysctlbyname("hw.backlight_max", &backlight_max, &len,
 806                     NULL, 0) < 0) {
 807                         /* No more backlight adjustment */
 808                         BackLightPct = 100;
 809                         goto after_backlight;
 810                 }
 811
 812                 len = sizeof(OldBackLightLevel);
 813                 if (sysctlbyname("hw.backlight_level", &OldBackLightLevel, &len,
 814                     NULL, 0) < 0) {
 815                         /* No more backlight adjustment */
 816                         BackLightPct = 100;
 817                         goto after_backlight;
 818                 }
 819
 820                 backlight = (backlight_max * BackLightPct) / 100;
 821                 if (backlight >= OldBackLightLevel) {
 822                         /* No more backlight adjustment */
 823                         BackLightPct = 100;
 824                         goto after_backlight;
 825                 }
 826
 827                 if (sysctlbyname("hw.backlight_level", NULL, NULL,
 828                     &backlight, sizeof(backlight)) < 0) {
 829                         /* No more backlight adjustment */
 830                         BackLightPct = 100;
 831                         goto after_backlight;
 832                 }
 833                 BackLightDown = 1;
 834         }
 835 after_backlight:
 836
 837         len = sizeof(life);
 838         if (sysctlbyname("hw.acpi.battery.life", &life, &len, NULL, 0) < 0)
 839                 return 1;
 840
 841         if (BatShutdownLinger > 0) {
 842                 timespecsub(&cur, &BatShutdownStartT, &ts);
 843                 if (ts.tv_sec > BatShutdownLinger)
 844                         BatShutdownLinger = 0;
 845         }
 846
 847         if (life <= BatLifeMin) {
 848                 if (BatShutdownLinger == 0 || BatShutdownLingerSet == 0) {
 849                         syslog(LOG_ALERT, "low battery life %d%%, "
 850                             "shutting down", life);
 851                         if (vfork() == 0)
 852                                 execlp("poweroff", "poweroff", NULL);
 853                         return 0;
 854                 } else if (BatShutdownLinger < 0) {
 855                         BatShutdownLinger = BatShutdownLingerSet;
 856                         BatShutdownStartT = cur;
 857                 }
 858                 low_battery_alert(life);
 859         }
 860         return 1;
 861 }
 862
 863 static void
 864 get_ncpus(void)
 865 {
 866         size_t slen;
 867
 868         slen = sizeof(NCpus);
 869         if (sysctlbyname("hw.ncpu", &NCpus, &slen, NULL, 0) < 0)
 870                 err(1, "sysctlbyname hw.ncpu failed");
 871         if (DebugOpt)
 872                 printf("hw.ncpu %d\n", NCpus);
 873 }
 874
 875 static void
 876 get_uschedcpus(void)
 877 {
 878         size_t slen;
 879
 880         slen = sizeof(usched_cpu_used);
 881         if (sysctlbyname("kern.usched_global_cpumask", &usched_cpu_used, &slen,
 882             NULL, 0) < 0)
 883                 err(1, "sysctlbyname kern.usched_global_cpumask failed");
 884         if (DebugOpt) {
 885                 int i;
 886
 887                 printf("usched cpumask was: ");
 888                 for (i = 0; i < (int)NELEM(usched_cpu_used.ary); ++i)
 889                         printf("%jx ", (uintmax_t)usched_cpu_used.ary[i]);
 890                 printf("\n");
 891         }
 892 }
 893
 894 static void
 895 set_uschedcpus(void)
 896 {
 897         if (DebugOpt) {
 898                 int i;
 899
 900                 printf("usched cpumask: ");
 901                 for (i = 0; i < (int)NELEM(usched_cpu_used.ary); ++i) {
 902                         printf("%jx ",
 903                             (uintmax_t)usched_cpu_used.ary[i]);
 904                 }
 905                 printf("\n");
 906         }
 907         sysctlbyname("kern.usched_global_cpumask", NULL, 0,
 908             &usched_cpu_used, sizeof(usched_cpu_used));
 909 }
 910
 911 static int
 912 has_perfbias(void)
 913 {
 914         size_t len;
 915         int hint;
 916
 917         len = sizeof(hint);
 918         if (sysctlbyname("machdep.perfbias0.hint", &hint, &len, NULL, 0) < 0)
 919                 return 0;
 920         return 1;
 921 }
 922
 923 static void
 924 set_perfbias(int cpu, int inc)
 925 {
 926         int hint = inc ? 0 : 15;
 927         char sysid[64];
 928
 929         if (DebugOpt)
 930                 printf("cpu%d set perfbias hint %d\n", cpu, hint);
 931         snprintf(sysid, sizeof(sysid), "machdep.perfbias%d.hint", cpu);
 932         sysctlbyname(sysid, NULL, NULL, &hint, sizeof(hint));
 933 }
 934
 935 static void
 936 init_perf(void)
 937 {
 938         struct cpu_state *state;
 939         int cpu;
 940
 941         /* Get usched cpumask */
 942         get_uschedcpus();
 943
 944         /*
 945          * Assume everything are used and are maxed out, before we
 946          * start.
 947          */
 948         CPUMASK_ASSBMASK(cpu_used, NCpus);
 949         cpu_pwrdom_used = cpu_pwrdom_mask;
 950         global_pcpu_limit = NCpus;
 951
 952         for (cpu = 0; cpu < NCpus; ++cpu) {
 953                 state = &pcpu_state[cpu];
 954
 955                 state->cpu_uavg = 0.0;
 956                 state->cpu_davg = 0.0;
 957                 state->cpu_limit = 1;
 958                 state->cpu_count = 1;
 959                 snprintf(state->cpu_name, sizeof(state->cpu_name), "cpu%d",
 960                     cpu);
 961         }
 962
 963         state = &global_cpu_state;
 964         state->cpu_uavg = 0.0;
 965         state->cpu_davg = 0.0;
 966         state->cpu_limit = NCpus;
 967         state->cpu_count = NCpus;
 968         strlcpy(state->cpu_name, "global", sizeof(state->cpu_name));
 969 }
 970
 971 static int
 972 get_nstate(struct cpu_state *state, double srt)
 973 {
 974         int ustate, dstate, nstate;
 975
 976         /* speeding up */
 977         state->cpu_uavg = (state->cpu_uavg * 2.0 + state->cpu_qavg) / 3.0;
 978         /* slowing down */
 979         state->cpu_davg = (state->cpu_davg * srt + state->cpu_qavg) / (srt + 1);
 980         if (state->cpu_davg < state->cpu_uavg)
 981                 state->cpu_davg = state->cpu_uavg;
 982
 983         ustate = state->cpu_uavg / TriggerUp;
 984         if (ustate < state->cpu_limit)
 985                 ustate = state->cpu_uavg / TriggerDown;
 986         dstate = state->cpu_davg / TriggerUp;
 987         if (dstate < state->cpu_limit)
 988                 dstate = state->cpu_davg / TriggerDown;
 989
 990         nstate = (ustate > dstate) ? ustate : dstate;
 991         if (nstate > state->cpu_count)
 992                 nstate = state->cpu_count;
 993
 994         if (DebugOpt) {
 995                 printf("%s qavg=%5.2f uavg=%5.2f davg=%5.2f "
 996                     "%2d ncpus=%d\n", state->cpu_name,
 997                     state->cpu_qavg, state->cpu_uavg, state->cpu_davg,
 998                     state->cpu_limit, nstate);
 999         }
1000         return nstate;
1001 }
1002
1003 static void
1004 mon_perf(double srt)
1005 {
1006         cpumask_t ocpu_used, ocpu_pwrdom_used;
1007         int pnstate = 0, nstate;
1008         int cpu;
1009
1010         /*
1011          * Find cpus requiring performance and their cooresponding power
1012          * domains.  Save the number of cpus requiring performance in
1013          * pnstate.
1014          */
1015         ocpu_used = cpu_used;
1016         ocpu_pwrdom_used = cpu_pwrdom_used;
1017
1018         CPUMASK_ASSZERO(cpu_used);
1019         CPUMASK_ASSZERO(cpu_pwrdom_used);
1020
1021         for (cpu = 0; cpu < NCpus; ++cpu) {
1022                 struct cpu_state *state = &pcpu_state[cpu];
1023                 int s;
1024
1025                 s = get_nstate(state, srt);
1026                 if (s) {
1027                         CPUMASK_ORBIT(cpu_used, cpu);
1028                         CPUMASK_ORBIT(cpu_pwrdom_used, cpu2pwrdom[cpu]);
1029                 }
1030                 pnstate += s;
1031
1032                 state->cpu_limit = s;
1033         }
1034
1035         /*
1036          * Calculate nstate, the number of cpus we wish to run at max
1037          * performance.
1038          */
1039         nstate = get_nstate(&global_cpu_state, srt);
1040
1041         if (nstate == global_cpu_state.cpu_limit &&
1042             (NFreqChanged & NFREQ_MONPERF) == 0 &&
1043             (pnstate == global_pcpu_limit || nstate > pnstate)) {
1044                 /* Nothing changed; keep the sets */
1045                 cpu_used = ocpu_used;
1046                 cpu_pwrdom_used = ocpu_pwrdom_used;
1047
1048                 global_pcpu_limit = pnstate;
1049                 return;
1050         }
1051         NFreqChanged &= ~NFREQ_MONPERF;
1052         global_pcpu_limit = pnstate;
1053
1054         if (nstate > pnstate) {
1055                 /*
1056                  * Add spare cpus to meet global performance requirement.
1057                  */
1058                 add_spare_cpus(ocpu_used, nstate - pnstate);
1059         }
1060
1061         global_cpu_state.cpu_limit = nstate;
1062
1063         /*
1064          * Adjust cpu and cpu power domain performance
1065          */
1066         adj_perf(ocpu_used, ocpu_pwrdom_used);
1067 }
1068
1069 static void
1070 add_spare_cpus(const cpumask_t ocpu_used, int ncpu)
1071 {
1072         cpumask_t saved_pwrdom, xcpu_used;
1073         int done = 0, cpu;
1074
1075         /*
1076          * Find more cpus in the previous cpu set.
1077          */
1078         xcpu_used = cpu_used;
1079         CPUMASK_XORMASK(xcpu_used, ocpu_used);
1080         while (CPUMASK_TESTNZERO(xcpu_used)) {
1081                 cpu = BSFCPUMASK(xcpu_used);
1082                 CPUMASK_NANDBIT(xcpu_used, cpu);
1083
1084                 if (CPUMASK_TESTBIT(ocpu_used, cpu)) {
1085                         CPUMASK_ORBIT(cpu_pwrdom_used, cpu2pwrdom[cpu]);
1086                         CPUMASK_ORBIT(cpu_used, cpu);
1087                         --ncpu;
1088                         if (ncpu == 0)
1089                                 return;
1090                 }
1091         }
1092
1093         /*
1094          * Find more cpus in the used cpu power domains.
1095          */
1096         saved_pwrdom = cpu_pwrdom_used;
1097 again:
1098         while (CPUMASK_TESTNZERO(saved_pwrdom)) {
1099                 cpumask_t unused_cpumask;
1100                 int dom;
1101
1102                 dom = BSFCPUMASK(saved_pwrdom);
1103                 CPUMASK_NANDBIT(saved_pwrdom, dom);
1104
1105                 unused_cpumask = cpu_pwrdomain[dom]->dom_cpumask;
1106                 CPUMASK_NANDMASK(unused_cpumask, cpu_used);
1107
1108                 while (CPUMASK_TESTNZERO(unused_cpumask)) {
1109                         cpu = BSFCPUMASK(unused_cpumask);
1110                         CPUMASK_NANDBIT(unused_cpumask, cpu);
1111
1112                         CPUMASK_ORBIT(cpu_pwrdom_used, dom);
1113                         CPUMASK_ORBIT(cpu_used, cpu);
1114                         --ncpu;
1115                         if (ncpu == 0)
1116                                 return;
1117                 }
1118         }
1119         if (!done) {
1120                 done = 1;
1121                 /*
1122                  * Find more cpus in unused cpu power domains
1123                  */
1124                 saved_pwrdom = cpu_pwrdom_mask;
1125                 CPUMASK_NANDMASK(saved_pwrdom, cpu_pwrdom_used);
1126                 goto again;
1127         }
1128         if (DebugOpt)
1129                 printf("%d cpus not found\n", ncpu);
1130 }
1131
1132 static void
1133 acpi_set_cpufreq(int dom, int inc)
1134 {
1135         int lowest, highest, desired;
1136         char sysid[64];
1137
1138         acpi_get_cpufreq(dom, &highest, &lowest);
1139         if (highest == 0 || lowest == 0)
1140                 return;
1141         desired = inc ? highest : lowest;
1142
1143         if (DebugOpt)
1144                 printf("dom%d set frequency %d\n", dom, desired);
1145         snprintf(sysid, sizeof(sysid), "hw.acpi.cpu.px_dom%d.select", dom);
1146         sysctlbyname(sysid, NULL, NULL, &desired, sizeof(desired));
1147 }
1148
1149 static void
1150 adj_cpu_pwrdom(int dom, int inc)
1151 {
1152         if (AdjustCpuFreq && (inc == 0 || AdjustCpuFreqOverride == 0))
1153                 acpi_set_cpufreq(dom, inc);
1154 }
1155
1156 static void
1157 adj_cpu_perf(int cpu, int inc)
1158 {
1159         if (DebugOpt) {
1160                 if (inc)
1161                         printf("cpu%d increase perf\n", cpu);
1162                 else
1163                         printf("cpu%d decrease perf\n", cpu);
1164         }
1165
1166         if (HasPerfbias)
1167                 set_perfbias(cpu, inc);
1168         if (AdjustCstate)
1169                 set_cstate(cpu, inc);
1170 }
1171
1172 static void
1173 adj_perf(cpumask_t xcpu_used, cpumask_t xcpu_pwrdom_used)
1174 {
1175         int cpu, inc;
1176
1177         if (AdjustUsched) {
1178                 cpumask_t old_usched_used;
1179
1180                 /*
1181                  * Set cpus requiring performance to the userland process
1182                  * scheduler.  Leave the rest of cpus unmapped.
1183                  */
1184                 old_usched_used = usched_cpu_used;
1185                 usched_cpu_used = cpu_used;
1186                 if (CPUMASK_TESTZERO(usched_cpu_used))
1187                         CPUMASK_ORBIT(usched_cpu_used, 0);
1188                 if (CPUMASK_CMPMASKNEQ(usched_cpu_used, old_usched_used))
1189                         set_uschedcpus();
1190         }
1191
1192         /*
1193          * Adjust per-cpu performance for any cpus which changed.
1194          */
1195         CPUMASK_XORMASK(xcpu_used, cpu_used);
1196         if (NFreqChanged & NFREQ_ADJPERF)
1197                 CPUMASK_ASSBMASK(xcpu_used, NCpus);
1198         while (CPUMASK_TESTNZERO(xcpu_used)) {
1199                 cpu = BSFCPUMASK(xcpu_used);
1200                 CPUMASK_NANDBIT(xcpu_used, cpu);
1201
1202                 if (CPUMASK_TESTBIT(cpu_used, cpu)) {
1203                         /* Increase cpu performance */
1204                         inc = 1;
1205                 } else {
1206                         /* Decrease cpu performance */
1207                         inc = 0;
1208                 }
1209                 adj_cpu_perf(cpu, inc);
1210         }
1211
1212         /*
1213          * Adjust cpu power domain performance.  This could affect
1214          * a set of cpus.
1215          */
1216         CPUMASK_XORMASK(xcpu_pwrdom_used, cpu_pwrdom_used);
1217         if (NFreqChanged & NFREQ_ADJPERF)
1218                 CPUMASK_ASSBMASK(xcpu_pwrdom_used, NCpus);
1219         while (CPUMASK_TESTNZERO(xcpu_pwrdom_used)) {
1220                 int dom;
1221
1222                 dom = BSFCPUMASK(xcpu_pwrdom_used);
1223                 CPUMASK_NANDBIT(xcpu_pwrdom_used, dom);
1224
1225                 if (CPUMASK_TESTBIT(cpu_pwrdom_used, dom)) {
1226                         /* Increase cpu power domain performance */
1227                         inc = 1;
1228                 } else {
1229                         /* Decrease cpu power domain performance */
1230                         inc = 0;
1231                 }
1232                 adj_cpu_pwrdom(dom, inc);
1233         }
1234         NFreqChanged &= ~NFREQ_ADJPERF;
1235 }
1236
1237 static void
1238 restore_perf(void)
1239 {
1240         cpumask_t ocpu_used, ocpu_pwrdom_used;
1241
1242         /* Remove highest cpu frequency limitation */
1243         HighestCpuFreq = 0;
1244
1245         ocpu_used = cpu_used;
1246         ocpu_pwrdom_used = cpu_pwrdom_used;
1247
1248         /* Max out all cpus and cpu power domains performance */
1249         CPUMASK_ASSBMASK(cpu_used, NCpus);
1250         cpu_pwrdom_used = cpu_pwrdom_mask;
1251
1252         adj_perf(ocpu_used, ocpu_pwrdom_used);
1253
1254         if (AdjustCstate) {
1255                 /*
1256                  * Restore the original mwait C-state
1257                  */
1258                 if (DebugOpt)
1259                         printf("global set cstate %s\n", orig_global_cx);
1260                 sysctlbyname("machdep.mwait.CX.idle", NULL, NULL,
1261                     orig_global_cx, strlen(orig_global_cx) + 1);
1262         }
1263 }
1264
1265 static int
1266 probe_cstate(void)
1267 {
1268         char cx_supported[1024];
1269         const char *target;
1270         char *ptr;
1271         int idle_hlt, deep = 1;
1272         size_t len;
1273
1274         len = sizeof(idle_hlt);
1275         if (sysctlbyname("machdep.cpu_idle_hlt", &idle_hlt, &len, NULL, 0) < 0)
1276                 return 0;
1277         if (idle_hlt != 1)
1278                 return 0;
1279
1280         len = sizeof(cx_supported);
1281         if (sysctlbyname("machdep.mwait.CX.supported", cx_supported, &len,
1282             NULL, 0) < 0)
1283                 return 0;
1284
1285         len = sizeof(orig_global_cx);
1286         if (sysctlbyname("machdep.mwait.CX.idle", orig_global_cx, &len,
1287             NULL, 0) < 0)
1288                 return 0;
1289
1290         strlcpy(cpu_perf_cx, "AUTODEEP", sizeof(cpu_perf_cx));
1291         cpu_perf_cxlen = strlen(cpu_perf_cx) + 1;
1292         if (sysctlbyname("machdep.mwait.CX.idle", NULL, NULL,
1293             cpu_perf_cx, cpu_perf_cxlen) < 0) {
1294                 /* AUTODEEP is not supported; try AUTO */
1295                 deep = 0;
1296                 strlcpy(cpu_perf_cx, "AUTO", sizeof(cpu_perf_cx));
1297                 cpu_perf_cxlen = strlen(cpu_perf_cx) + 1;
1298                 if (sysctlbyname("machdep.mwait.CX.idle", NULL, NULL,
1299                     cpu_perf_cx, cpu_perf_cxlen) < 0)
1300                         return 0;
1301         }
1302
1303         if (!deep)
1304                 target = "C2/0";
1305         else
1306                 target = NULL;
1307         for (ptr = strtok(cx_supported, " "); ptr != NULL;
1308              ptr = strtok(NULL, " ")) {
1309                 if (target == NULL ||
1310                     (target != NULL && strcmp(ptr, target) == 0)) {
1311                         strlcpy(cpu_idle_cx, ptr, sizeof(cpu_idle_cx));
1312                         cpu_idle_cxlen = strlen(cpu_idle_cx) + 1;
1313                         if (target != NULL)
1314                                 break;
1315                 }
1316         }
1317         if (cpu_idle_cxlen == 0)
1318                 return 0;
1319
1320         if (DebugOpt) {
1321                 printf("cstate orig %s, perf %s, idle %s\n",
1322                     orig_global_cx, cpu_perf_cx, cpu_idle_cx);
1323         }
1324         return 1;
1325 }
1326
1327 static void
1328 set_cstate(int cpu, int inc)
1329 {
1330         const char *cst;
1331         char sysid[64];
1332         size_t len;
1333
1334         if (inc) {
1335                 cst = cpu_perf_cx;
1336                 len = cpu_perf_cxlen;
1337         } else {
1338                 cst = cpu_idle_cx;
1339                 len = cpu_idle_cxlen;
1340         }
1341
1342         if (DebugOpt)
1343                 printf("cpu%d set cstate %s\n", cpu, cst);
1344         snprintf(sysid, sizeof(sysid), "machdep.mwait.CX.idle%d", cpu);
1345         sysctlbyname(sysid, NULL, NULL, cst, len);
1346 }
1347
1348 static void
1349 restore_backlight(void)
1350 {
1351         if (BackLightDown) {
1352                 BackLightDown = 0;
1353                 sysctlbyname("hw.backlight_level", NULL, NULL,
1354                     &OldBackLightLevel, sizeof(OldBackLightLevel));
1355         }
1356 }
1357
1358 /*
1359  * get_cputemp() / mon_cputemp()
1360  *
1361  * This enforces the maximum cpu frequency based on temperature
1362  * verses MinTemp and MaxTemp.
1363  */
1364 static int
1365 get_cputemp(void)
1366 {
1367         char sysid[64];
1368         struct sensor sensor;
1369         size_t sensor_size;
1370         int t;
1371         int mt = -1;
1372         int n;
1373
1374         for (n = 0; ; ++n) {
1375                 t = 0;
1376                 snprintf(sysid, sizeof(sysid),
1377                          "hw.sensors.cpu_node%d.temp0", n);
1378                 sensor_size = sizeof(sensor);
1379                 if (sysctlbyname(sysid, &sensor, &sensor_size, NULL, 0) < 0)
1380                         break;
1381                 t = -1;
1382                 if ((sensor.flags & (SENSOR_FINVALID | SENSOR_FUNKNOWN)) == 0) {
1383                         t = (int)((sensor.value - 273150000) / 1000000);
1384                         if (mt < t)
1385                                 mt = t;
1386                 }
1387         }
1388         if (n)
1389                 return mt;
1390
1391         /*
1392          * Missing nodeN for some reason, try cpuN.
1393          */
1394         for (n = 0; ; ++n) {
1395                 t = 0;
1396                 snprintf(sysid, sizeof(sysid),
1397                          "hw.sensors.cpu%d.temp0", n);
1398                 sensor_size = sizeof(sensor);
1399                 if (sysctlbyname(sysid, &sensor, &sensor_size, NULL, 0) < 0)
1400                         break;
1401                 t = -1;
1402                 if ((sensor.flags & (SENSOR_FINVALID | SENSOR_FUNKNOWN)) == 0) {
1403                         t = (int)((sensor.value - 273150000) / 1000000);
1404                         if (mt < t)
1405                                 mt = t;
1406                 }
1407         }
1408         return mt;
1409 }
1410
1411 static void
1412 set_global_freq(int freq)
1413 {
1414         if (freq > 0)
1415                 sysctlbyname("hw.acpi.cpu.px_global",
1416                              NULL, NULL, &freq, sizeof(freq));
1417 }
1418
1419 static int
1420 get_global_freq(void)
1421 {
1422         int freq;
1423         size_t freq_size;
1424
1425         freq = -1;
1426         freq_size = sizeof(freq);
1427         sysctlbyname("hw.acpi.cpu.px_global", &freq, &freq_size, NULL, 0);
1428
1429         return freq;
1430 }
1431
1432 static void
1433 mon_cputemp(void)
1434 {
1435         static int last_temp = -1;
1436         static int last_idx = -1;
1437         int temp = get_cputemp();
1438         int idx;
1439         int lowest;
1440         int highest;
1441         static int CurPXGlobal __unused;
1442
1443         /*
1444          * Reseed FreqAry, it can change w/AC power state
1445          */
1446         acpi_get_cpufreq(0, &lowest, &highest);
1447
1448         /*
1449          * Some cpu frequency steps can cause large shifts in cpu temperature,
1450          * creating an oscillation that min-maxes the temperature in a way
1451          * that is not desireable.  To deal with this, we impose an exponential
1452          * average for any temperature change.
1453          *
1454          * We have to do this in both directions, otherwise (in particular)
1455          * laptop fan responsiveness and temperature sensor response times
1456          * can create major frequency oscillations.
1457          */
1458         if (last_temp < 0 || (NFreqChanged & NFREQ_CPUTEMP)) {
1459                 NFreqChanged &= ~NFREQ_CPUTEMP;
1460                 last_temp = temp << 8;
1461         } else if (temp < last_temp) {
1462                 last_temp = (last_temp * 15 + (temp << 8)) / 16;
1463                 if (DebugOpt) {
1464                         printf("Falling temp %d (use %d)\n",
1465                                 temp, (last_temp >> 8));
1466                 }
1467         } else {
1468                 last_temp = (last_temp * 15 + (temp << 8)) / 16;
1469                 if (DebugOpt) {
1470                         printf("Rising temp %d (use %d)\n",
1471                                 temp, (last_temp >> 8));
1472                 }
1473         }
1474         temp = last_temp >> 8;
1475
1476         /*
1477          * CPU Temp not available or available frequencies not yet
1478          * probed.
1479          */
1480         if (DebugOpt)
1481                 printf("Temp %d {%d-%d} NFreq=%d)\n",
1482                        temp, MinTemp, MaxTemp, NFreq);
1483         if (temp <= 0)
1484                 return;
1485         if (NFreq == 0)
1486                 return;
1487
1488         /*
1489          * Return to normal operation if under the minimum
1490          */
1491         if (temp <= MinTemp) {
1492                 if (AdjustCpuFreqOverride) {
1493                         AdjustCpuFreqOverride = 0;
1494                         CurPXGlobal = 0;
1495                         NFreqChanged = NFREQ_ALL;
1496                         last_idx = -1;
1497                         syslog(LOG_ALERT,
1498                                "Temp below %d, returning to normal operation",
1499                                MinTemp);
1500                         if (SavedPXGlobal)
1501                                 set_global_freq(SavedPXGlobal);
1502                 }
1503                 return;
1504         }
1505
1506         /*
1507          * Hysteresis before entering temperature control mode
1508          */
1509         if (AdjustCpuFreqOverride == 0 &&
1510             temp <= MinTemp + (MaxTemp - MinTemp) / 10 + 1) {
1511                 return;
1512         }
1513
1514         /*
1515          * Override frequency controls (except for idle -> lowest)
1516          */
1517         if (AdjustCpuFreqOverride == 0) {
1518                 AdjustCpuFreqOverride = 1;
1519                 SavedPXGlobal = get_global_freq();
1520                 CurPXGlobal = 0;
1521                 NFreqChanged = NFREQ_ALL;
1522                 last_idx = -1;
1523                 syslog(LOG_ALERT,
1524                        "Temp %d {%d-%d}, entering temperature control mode",
1525                        temp, MinTemp, MaxTemp);
1526         }
1527         if (temp > MaxTemp + (MaxTemp - MinTemp) / 10 + 1) {
1528                 syslog(LOG_ALERT,
1529                        "Temp %d {%d-%d}, TOO HOT!!!",
1530                        temp, MinTemp, MaxTemp);
1531         }
1532         idx = (temp - MinTemp) * NFreq / (MaxTemp - MinTemp);
1533         if (idx < 0 || idx >= NFreq)    /* overtemp */
1534                 idx = NFreq - 1;
1535
1536         /*
1537          * Limit frequency shifts to single steps in both directions.
1538          * Some fans react very quickly, this will reduce oscillations.
1539          */
1540         if (DebugOpt)
1541                 printf("Temp index %d (use %d)\n", idx, last_idx);
1542         if (last_idx >= 0 && idx < last_idx)
1543                 idx = last_idx - 1;
1544         else if (last_idx >= 0 && idx > last_idx)
1545                 idx = last_idx + 1;
1546         last_idx = idx;
1547
1548         /*
1549          * One last thing, make sure our frequency adheres to
1550          * HighestCpuFreq.  However, override LowestCpuFreq for
1551          * temperature control purposes.
1552          */
1553         while (HighestCpuFreq > 0 && idx < NFreq &&
1554                FreqAry[idx] > HighestCpuFreq) {
1555                 ++idx;
1556         }
1557 #if 0
1558         /*
1559          * Currently ignore LowestCpuFreq if temp control thinks it
1560          * needs to go lower
1561          */
1562         while (LowestCpuFreq > 0 && idx > 0 &&
1563                FreqAry[idx] < LowestCpuFreq) {
1564                 --idx;
1565         }
1566 #endif
1567
1568         if (FreqAry[idx] != CurPXGlobal) {
1569                 CurPXGlobal = FreqAry[idx];
1570
1571 #if 0
1572                 /* this can get noisy so don't log for now */
1573                 syslog(LOG_ALERT,
1574                        "Temp %d {%d-%d}, set frequency %d",
1575                        temp, MinTemp, MaxTemp, CurPXGlobal);
1576 #endif
1577         }
1578         set_global_freq(CurPXGlobal);
1579 }