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 } 183 184