powermac_thermal.c

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    1 /*-
    2  * Copyright (c) 2009-2011 Nathan Whitehorn
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD$");
   29 
   30 #include <sys/param.h>
   31 #include <sys/kernel.h>
   32 #include <sys/lock.h>
   33 #include <sys/mutex.h>
   34 #include <sys/systm.h>
   35 
   36 #include <sys/types.h>
   37 #include <sys/kthread.h>
   38 #include <sys/malloc.h>
   39 #include <sys/reboot.h>
   40 #include <sys/sysctl.h>
   41 #include <sys/queue.h>
   42 
   43 #include "powermac_thermal.h"
   44 
   45 static void fan_management_proc(void);
   46 static void pmac_therm_manage_fans(void);
   47 
   48 static struct proc *pmac_them_proc;
   49 static int enable_pmac_thermal = 1;
   50 
   51 static struct kproc_desc pmac_therm_kp = {
   52         "pmac_thermal",
   53         fan_management_proc,
   54         &pmac_them_proc
   55 };
   56 
   57 SYSINIT(pmac_therm_setup, SI_SUB_KTHREAD_IDLE, SI_ORDER_ANY, kproc_start,
   58     &pmac_therm_kp);
   59 SYSCTL_INT(_machdep, OID_AUTO, manage_fans, CTLFLAG_RW | CTLFLAG_TUN,
   60     &enable_pmac_thermal, 1, "Enable automatic fan management");
   61 static MALLOC_DEFINE(M_PMACTHERM, "pmactherm", "Powermac Thermal Management");
   62 
   63 struct pmac_fan_le {
   64         struct pmac_fan                 *fan;
   65         int                             last_val;
   66         SLIST_ENTRY(pmac_fan_le)        entries;
   67 };
   68 struct pmac_sens_le {
   69         struct pmac_therm               *sensor;
   70         int                             last_val;
   71         SLIST_ENTRY(pmac_sens_le)       entries;
   72 };
   73 static SLIST_HEAD(pmac_fans, pmac_fan_le) fans = SLIST_HEAD_INITIALIZER(fans);
   74 static SLIST_HEAD(pmac_sensors, pmac_sens_le) sensors =
   75     SLIST_HEAD_INITIALIZER(sensors);
   76 
   77 static void
   78 fan_management_proc(void)
   79 {
   80         /* Nothing to manage? */
   81         if (SLIST_EMPTY(&fans))
   82                 kproc_exit(0);
   83         
   84         while (1) {
   85                 pmac_therm_manage_fans();
   86                 pause("pmac_therm", hz);
   87         }
   88 }
   89 
   90 static void
   91 pmac_therm_manage_fans(void)
   92 {
   93         struct pmac_sens_le *sensor;
   94         struct pmac_fan_le *fan;
   95         int average_excess, max_excess_zone, frac_excess;
   96         int nsens, nsens_zone;
   97         int temp;
   98 
   99         if (!enable_pmac_thermal)
  100                 return;
  101 
  102         /* Read all the sensors */
  103         SLIST_FOREACH(sensor, &sensors, entries) {
  104                 temp = sensor->sensor->read(sensor->sensor);
  105                 if (temp > 0) /* Use the previous temp in case of error */
  106                         sensor->last_val = temp;
  107 
  108                 if (sensor->last_val > sensor->sensor->max_temp) {
  109                         printf("WARNING: Current temperature (%s: %d.%d C) "
  110                             "exceeds critical temperature (%d.%d C)! "
  111                             "Shutting down!\n", sensor->sensor->name,
  112                                (sensor->last_val - ZERO_C_TO_K) / 10,
  113                                (sensor->last_val - ZERO_C_TO_K) % 10,
  114                                (sensor->sensor->max_temp - ZERO_C_TO_K) / 10,
  115                                (sensor->sensor->max_temp - ZERO_C_TO_K) % 10);
  116                         shutdown_nice(RB_POWEROFF);
  117                 }
  118         }
  119 
  120         /* Set all the fans */
  121         SLIST_FOREACH(fan, &fans, entries) {
  122                 nsens = nsens_zone = 0;
  123                 average_excess = max_excess_zone = 0;
  124                 SLIST_FOREACH(sensor, &sensors, entries) {
  125                         frac_excess = (sensor->last_val -
  126                             sensor->sensor->target_temp)*100 /
  127                             (sensor->sensor->max_temp -
  128                             sensor->sensor->target_temp);
  129                         if (frac_excess < 0)
  130                                 frac_excess = 0;
  131                         if (sensor->sensor->zone == fan->fan->zone) {
  132                                 max_excess_zone = imax(max_excess_zone,
  133                                     frac_excess);
  134                                 nsens_zone++;
  135                         }
  136                         average_excess += frac_excess;
  137                         nsens++;
  138                 }
  139                 average_excess /= nsens;
  140 
  141                 /* If there are no sensors in this zone, use the average */
  142                 if (nsens_zone == 0)
  143                         max_excess_zone = average_excess;
  144                 /* No sensors at all? Use default */
  145                 if (nsens == 0) {
  146                         fan->fan->set(fan->fan, fan->fan->default_rpm);
  147                         continue;
  148                 }
  149 
  150                 /*
  151                  * Scale the fan linearly in the max temperature in its
  152                  * thermal zone.
  153                  */
  154                 fan->fan->set(fan->fan, max_excess_zone *
  155                     (fan->fan->max_rpm - fan->fan->min_rpm)/100 +
  156                     fan->fan->min_rpm);
  157         }
  158 }
  159 
  160 void
  161 pmac_thermal_fan_register(struct pmac_fan *fan)
  162 {
  163         struct pmac_fan_le *list_entry;
  164 
  165         list_entry = malloc(sizeof(struct pmac_fan_le), M_PMACTHERM,
  166             M_ZERO | M_WAITOK);
  167         list_entry->fan = fan;
  168 
  169         SLIST_INSERT_HEAD(&fans, list_entry, entries);
  170 }
  171 
  172 void
  173 pmac_thermal_sensor_register(struct pmac_therm *sensor)
  174 {
  175         struct pmac_sens_le *list_entry;
  176 
  177         list_entry = malloc(sizeof(struct pmac_sens_le), M_PMACTHERM,
  178             M_ZERO | M_WAITOK);
  179         list_entry->sensor = sensor;
  180 
  181         SLIST_INSERT_HEAD(&sensors, list_entry, entries);
  182 }
  183

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FreeBSD/Linux Kernel Cross Reference sys/powerpc/powermac/powermac_thermal.c

FreeBSD/Linux Kernel Cross Reference
sys/powerpc/powermac/powermac_thermal.c