powermac_thermal.c revision 222469
1222429Snwhitehorn/*- 2222429Snwhitehorn * Copyright (c) 2009-2011 Nathan Whitehorn 3222429Snwhitehorn * All rights reserved. 4222429Snwhitehorn * 5222429Snwhitehorn * Redistribution and use in source and binary forms, with or without 6222429Snwhitehorn * modification, are permitted provided that the following conditions 7222429Snwhitehorn * are met: 8222429Snwhitehorn * 1. Redistributions of source code must retain the above copyright 9222429Snwhitehorn * notice, this list of conditions and the following disclaimer. 10222429Snwhitehorn * 2. Redistributions in binary form must reproduce the above copyright 11222429Snwhitehorn * notice, this list of conditions and the following disclaimer in the 12222429Snwhitehorn * documentation and/or other materials provided with the distribution. 13222429Snwhitehorn * 14222429Snwhitehorn * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15222429Snwhitehorn * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16222429Snwhitehorn * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17222429Snwhitehorn * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18222429Snwhitehorn * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19222429Snwhitehorn * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20222429Snwhitehorn * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21222429Snwhitehorn * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22222429Snwhitehorn * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23222429Snwhitehorn * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24222429Snwhitehorn * SUCH DAMAGE. 25222429Snwhitehorn */ 26222429Snwhitehorn 27222429Snwhitehorn#include <sys/cdefs.h> 28222429Snwhitehorn__FBSDID("$FreeBSD: head/sys/powerpc/powermac/powermac_thermal.c 222469 2011-05-29 22:37:23Z nwhitehorn $"); 29222429Snwhitehorn 30222429Snwhitehorn#include <sys/param.h> 31222429Snwhitehorn#include <sys/kernel.h> 32222429Snwhitehorn#include <sys/lock.h> 33222429Snwhitehorn#include <sys/mutex.h> 34222429Snwhitehorn#include <sys/systm.h> 35222429Snwhitehorn 36222429Snwhitehorn#include <sys/types.h> 37222429Snwhitehorn#include <sys/kthread.h> 38222429Snwhitehorn#include <sys/malloc.h> 39222429Snwhitehorn#include <sys/reboot.h> 40222429Snwhitehorn#include <sys/sysctl.h> 41222429Snwhitehorn#include <sys/queue.h> 42222429Snwhitehorn 43222429Snwhitehorn#include "powermac_thermal.h" 44222429Snwhitehorn 45222429Snwhitehornstatic void fan_management_proc(void); 46222429Snwhitehornstatic void pmac_therm_manage_fans(void); 47222429Snwhitehorn 48222429Snwhitehornstatic struct proc *pmac_them_proc; 49222429Snwhitehornstatic int enable_pmac_thermal = 1; 50222429Snwhitehorn 51222429Snwhitehornstatic struct kproc_desc pmac_therm_kp = { 52222429Snwhitehorn "pmac_thermal", 53222429Snwhitehorn fan_management_proc, 54222429Snwhitehorn &pmac_them_proc 55222429Snwhitehorn}; 56222429Snwhitehorn 57222429SnwhitehornSYSINIT(pmac_therm_setup, SI_SUB_KTHREAD_IDLE, SI_ORDER_ANY, kproc_start, 58222429Snwhitehorn &pmac_therm_kp); 59222429SnwhitehornSYSCTL_INT(_machdep, OID_AUTO, manage_fans, CTLFLAG_RW | CTLFLAG_TUN, 60222429Snwhitehorn &enable_pmac_thermal, 1, "Enable automatic fan management"); 61222429SnwhitehornMALLOC_DEFINE(M_PMACTHERM, "pmactherm", "Powermac Thermal Management"); 62222429Snwhitehorn 63222429Snwhitehornstruct pmac_fan_le { 64222429Snwhitehorn struct pmac_fan *fan; 65222429Snwhitehorn int last_val; 66222429Snwhitehorn SLIST_ENTRY(pmac_fan_le) entries; 67222429Snwhitehorn}; 68222429Snwhitehornstruct pmac_sens_le { 69222429Snwhitehorn struct pmac_therm *sensor; 70222429Snwhitehorn int last_val; 71222429Snwhitehorn SLIST_ENTRY(pmac_sens_le) entries; 72222429Snwhitehorn}; 73222429Snwhitehornstatic SLIST_HEAD(pmac_fans, pmac_fan_le) fans = SLIST_HEAD_INITIALIZER(fans); 74222429Snwhitehornstatic SLIST_HEAD(pmac_sensors, pmac_sens_le) sensors = 75222429Snwhitehorn SLIST_HEAD_INITIALIZER(sensors); 76222429Snwhitehorn 77222429Snwhitehornstatic void 78222429Snwhitehornfan_management_proc(void) 79222429Snwhitehorn{ 80222429Snwhitehorn /* Nothing to manage? */ 81222429Snwhitehorn if (SLIST_EMPTY(&fans)) 82222469Snwhitehorn kproc_exit(0); 83222429Snwhitehorn 84222429Snwhitehorn while (1) { 85222429Snwhitehorn pmac_therm_manage_fans(); 86222429Snwhitehorn pause("pmac_therm", hz); 87222429Snwhitehorn } 88222429Snwhitehorn} 89222429Snwhitehorn 90222429Snwhitehornstatic void 91222429Snwhitehornpmac_therm_manage_fans(void) 92222429Snwhitehorn{ 93222429Snwhitehorn struct pmac_sens_le *sensor; 94222429Snwhitehorn struct pmac_fan_le *fan; 95222429Snwhitehorn int average_excess, max_excess_zone, frac_excess; 96222429Snwhitehorn int nsens, nsens_zone; 97222463Snwhitehorn int temp; 98222429Snwhitehorn 99222429Snwhitehorn if (!enable_pmac_thermal) 100222429Snwhitehorn return; 101222429Snwhitehorn 102222429Snwhitehorn /* Read all the sensors */ 103222429Snwhitehorn SLIST_FOREACH(sensor, &sensors, entries) { 104222463Snwhitehorn temp = sensor->sensor->read(sensor->sensor); 105222463Snwhitehorn if (temp > 0) /* Use the previous temp in case of error */ 106222463Snwhitehorn sensor->last_val = temp; 107222463Snwhitehorn 108222429Snwhitehorn if (sensor->last_val > sensor->sensor->max_temp) { 109222429Snwhitehorn printf("WARNING: Current temperature (%s: %d.%d C) " 110222429Snwhitehorn "exceeds critical temperature (%d.%d C)! " 111222429Snwhitehorn "Shutting down!\n", sensor->sensor->name, 112222429Snwhitehorn sensor->last_val / 10, sensor->last_val % 10, 113222429Snwhitehorn sensor->sensor->max_temp / 10, 114222429Snwhitehorn sensor->sensor->max_temp % 10); 115222429Snwhitehorn shutdown_nice(RB_POWEROFF); 116222429Snwhitehorn } 117222429Snwhitehorn } 118222429Snwhitehorn 119222429Snwhitehorn /* Set all the fans */ 120222429Snwhitehorn SLIST_FOREACH(fan, &fans, entries) { 121222429Snwhitehorn nsens = nsens_zone = 0; 122222429Snwhitehorn average_excess = max_excess_zone = 0; 123222429Snwhitehorn SLIST_FOREACH(sensor, &sensors, entries) { 124222429Snwhitehorn frac_excess = (sensor->last_val - 125222429Snwhitehorn sensor->sensor->target_temp)*100 / 126222429Snwhitehorn (sensor->sensor->max_temp - 127222429Snwhitehorn sensor->sensor->target_temp); 128222460Snwhitehorn if (frac_excess < 0) 129222460Snwhitehorn frac_excess = 0; 130222429Snwhitehorn if (sensor->sensor->zone == fan->fan->zone) { 131222429Snwhitehorn max_excess_zone = imax(max_excess_zone, 132222429Snwhitehorn frac_excess); 133222429Snwhitehorn nsens_zone++; 134222429Snwhitehorn } 135222429Snwhitehorn average_excess += frac_excess; 136222429Snwhitehorn nsens++; 137222429Snwhitehorn } 138222429Snwhitehorn average_excess /= nsens; 139222429Snwhitehorn 140222429Snwhitehorn /* If there are no sensors in this zone, use the average */ 141222429Snwhitehorn if (nsens_zone == 0) 142222429Snwhitehorn max_excess_zone = average_excess; 143222429Snwhitehorn /* No sensors at all? Use default */ 144222429Snwhitehorn if (nsens == 0) { 145222429Snwhitehorn fan->fan->set(fan->fan, fan->fan->default_rpm); 146222429Snwhitehorn continue; 147222429Snwhitehorn } 148222429Snwhitehorn 149222429Snwhitehorn /* 150222429Snwhitehorn * Scale the fan linearly in the max temperature in its 151222429Snwhitehorn * thermal zone. 152222429Snwhitehorn */ 153222429Snwhitehorn fan->fan->set(fan->fan, max_excess_zone * 154222429Snwhitehorn (fan->fan->max_rpm - fan->fan->min_rpm)/100 + 155222429Snwhitehorn fan->fan->min_rpm); 156222429Snwhitehorn } 157222429Snwhitehorn} 158222429Snwhitehorn 159222429Snwhitehornvoid 160222429Snwhitehornpmac_thermal_fan_register(struct pmac_fan *fan) 161222429Snwhitehorn{ 162222429Snwhitehorn struct pmac_fan_le *list_entry; 163222429Snwhitehorn 164222429Snwhitehorn list_entry = malloc(sizeof(struct pmac_fan_le), M_PMACTHERM, 165222429Snwhitehorn M_ZERO | M_WAITOK); 166222429Snwhitehorn list_entry->fan = fan; 167222429Snwhitehorn 168222429Snwhitehorn SLIST_INSERT_HEAD(&fans, list_entry, entries); 169222429Snwhitehorn} 170222429Snwhitehorn 171222429Snwhitehornvoid 172222429Snwhitehornpmac_thermal_sensor_register(struct pmac_therm *sensor) 173222429Snwhitehorn{ 174222429Snwhitehorn struct pmac_sens_le *list_entry; 175222429Snwhitehorn 176222429Snwhitehorn list_entry = malloc(sizeof(struct pmac_sens_le), M_PMACTHERM, 177222429Snwhitehorn M_ZERO | M_WAITOK); 178222429Snwhitehorn list_entry->sensor = sensor; 179222429Snwhitehorn 180222429Snwhitehorn SLIST_INSERT_HEAD(&sensors, list_entry, entries); 181222429Snwhitehorn} 182222429Snwhitehorn 183