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/*-
* Copyright (c) 2009-2011 Nathan Whitehorn
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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/kernel.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/systm.h>
#include <sys/types.h>
#include <sys/kthread.h>
#include <sys/malloc.h>
#include <sys/reboot.h>
#include <sys/sysctl.h>
#include <sys/queue.h>
#include "powermac_thermal.h"
static void fan_management_proc(void);
static void pmac_therm_manage_fans(void);
static struct proc *pmac_them_proc;
static int enable_pmac_thermal = 1;
static struct kproc_desc pmac_therm_kp = {
"pmac_thermal",
fan_management_proc,
&pmac_them_proc
};
SYSINIT(pmac_therm_setup, SI_SUB_KTHREAD_IDLE, SI_ORDER_ANY, kproc_start,
&pmac_therm_kp);
SYSCTL_INT(_machdep, OID_AUTO, manage_fans, CTLFLAG_RW | CTLFLAG_TUN,
&enable_pmac_thermal, 1, "Enable automatic fan management");
static MALLOC_DEFINE(M_PMACTHERM, "pmactherm", "Powermac Thermal Management");
struct pmac_fan_le {
struct pmac_fan *fan;
int last_val;
SLIST_ENTRY(pmac_fan_le) entries;
};
struct pmac_sens_le {
struct pmac_therm *sensor;
int last_val;
#define MAX_CRITICAL_COUNT 6
int critical_count;
SLIST_ENTRY(pmac_sens_le) entries;
};
static SLIST_HEAD(pmac_fans, pmac_fan_le) fans = SLIST_HEAD_INITIALIZER(fans);
static SLIST_HEAD(pmac_sensors, pmac_sens_le) sensors =
SLIST_HEAD_INITIALIZER(sensors);
static void
fan_management_proc(void)
{
/* Nothing to manage? */
if (SLIST_EMPTY(&fans))
kproc_exit(0);
while (1) {
pmac_therm_manage_fans();
pause("pmac_therm", hz);
}
}
static void
pmac_therm_manage_fans(void)
{
struct pmac_sens_le *sensor;
struct pmac_fan_le *fan;
int average_excess, max_excess_zone, frac_excess;
int nsens, nsens_zone;
int temp;
if (!enable_pmac_thermal)
return;
/* Read all the sensors */
SLIST_FOREACH(sensor, &sensors, entries) {
temp = sensor->sensor->read(sensor->sensor);
if (temp > 0) /* Use the previous temp in case of error */
sensor->last_val = temp;
if (sensor->last_val > sensor->sensor->max_temp) {
sensor->critical_count++;
printf("WARNING: Current temperature (%s: %d.%d C) "
"exceeds critical temperature (%d.%d C); "
"count=%d\n",
sensor->sensor->name,
(sensor->last_val - ZERO_C_TO_K) / 10,
(sensor->last_val - ZERO_C_TO_K) % 10,
(sensor->sensor->max_temp - ZERO_C_TO_K) / 10,
(sensor->sensor->max_temp - ZERO_C_TO_K) % 10,
sensor->critical_count);
if (sensor->critical_count >= MAX_CRITICAL_COUNT) {
printf("WARNING: %s temperature exceeded "
"critical temperature %d times in a row; "
"shutting down!\n",
sensor->sensor->name,
sensor->critical_count);
shutdown_nice(RB_POWEROFF);
}
} else {
if (sensor->critical_count > 0)
sensor->critical_count--;
}
}
/* Set all the fans */
SLIST_FOREACH(fan, &fans, entries) {
nsens = nsens_zone = 0;
average_excess = max_excess_zone = 0;
SLIST_FOREACH(sensor, &sensors, entries) {
frac_excess = (sensor->last_val -
sensor->sensor->target_temp)*100 /
(sensor->sensor->max_temp -
sensor->sensor->target_temp);
if (frac_excess < 0)
frac_excess = 0;
if (sensor->sensor->zone == fan->fan->zone) {
max_excess_zone = imax(max_excess_zone,
frac_excess);
nsens_zone++;
}
average_excess += frac_excess;
nsens++;
}
average_excess /= nsens;
/* If there are no sensors in this zone, use the average */
if (nsens_zone == 0)
max_excess_zone = average_excess;
/* No sensors at all? Use default */
if (nsens == 0) {
fan->fan->set(fan->fan, fan->fan->default_rpm);
continue;
}
/*
* Scale the fan linearly in the max temperature in its
* thermal zone.
*/
fan->fan->set(fan->fan, max_excess_zone *
(fan->fan->max_rpm - fan->fan->min_rpm)/100 +
fan->fan->min_rpm);
}
}
void
pmac_thermal_fan_register(struct pmac_fan *fan)
{
struct pmac_fan_le *list_entry;
list_entry = malloc(sizeof(struct pmac_fan_le), M_PMACTHERM,
M_ZERO | M_WAITOK);
list_entry->fan = fan;
SLIST_INSERT_HEAD(&fans, list_entry, entries);
}
void
pmac_thermal_sensor_register(struct pmac_therm *sensor)
{
struct pmac_sens_le *list_entry;
list_entry = malloc(sizeof(struct pmac_sens_le), M_PMACTHERM,
M_ZERO | M_WAITOK);
list_entry->sensor = sensor;
list_entry->last_val = 0;
list_entry->critical_count = 0;
SLIST_INSERT_HEAD(&sensors, list_entry, entries);
}
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