/* $OpenBSD: thermal.c,v 1.5 2016/07/29 04:41:53 jsg Exp $ */ /*- * 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 #include #include #include #include #include #include #include /* A 10 second timer for spinning down fans. */ #define FAN_HYSTERESIS_TIMER 10 void thermal_thread_init(void); void thermal_thread_create(void *); void thermal_thread_loop(void *); void thermal_manage_fans(void); int thermal_enable = 0; struct thermal_fan_le { struct thermal_fan *fan; int last_val; int timer; SLIST_ENTRY(thermal_fan_le) entries; }; struct thermal_sens_le { struct thermal_temp *sensor; int last_val; #define MAX_CRITICAL_COUNT 6 int critical_count; SLIST_ENTRY(thermal_sens_le) entries; }; SLIST_HEAD(thermal_fans, thermal_fan_le) fans = SLIST_HEAD_INITIALIZER(fans); SLIST_HEAD(thermal_sensors, thermal_sens_le) sensors = SLIST_HEAD_INITIALIZER(sensors); void thermal_thread_init(void) { if (thermal_enable) return; /* we're already running */ thermal_enable = 1; kthread_create_deferred(thermal_thread_create, &thermal_enable); } void thermal_thread_create(void *arg) { if (kthread_create(thermal_thread_loop, &thermal_enable, NULL, "thermal")) { printf("thermal kernel thread can't be created!\n"); thermal_enable = 0; } } void thermal_thread_loop(void *arg) { while (thermal_enable) { thermal_manage_fans(); tsleep(&thermal_enable, 0, "thermal", hz); } kthread_exit(0); } void thermal_manage_fans(void) { struct thermal_sens_le *sensor; struct thermal_fan_le *fan; int64_t average_excess, max_excess_zone, frac_excess; int fan_speed; int nsens, nsens_zone; int temp; /* 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 (%lld.%lld C); " "count=%d\n", sensor->sensor->name, (sensor->last_val - ZERO_C_TO_MUK)/1000000, (sensor->last_val - ZERO_C_TO_MUK)%1000000, (sensor->sensor->max_temp - ZERO_C_TO_MUK)/1000000, (sensor->sensor->max_temp - ZERO_C_TO_MUK)%1000000, 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); reboot(RB_HALT | RB_POWERDOWN | RB_TIMEBAD); } } 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) { temp = ulmin(sensor->last_val, sensor->sensor->max_temp); frac_excess = (temp - sensor->sensor->target_temp)*100 / (sensor->sensor->max_temp - temp + 1); if (frac_excess < 0) frac_excess = 0; if (sensor->sensor->zone == fan->fan->zone) { max_excess_zone = ulmax(max_excess_zone, frac_excess); nsens_zone++; } average_excess += frac_excess; nsens++; } /* No sensors at all? Use default */ if (nsens == 0) { fan->fan->set(fan->fan, fan->fan->default_rpm); continue; } average_excess /= nsens; /* If there are no sensors in this zone, use the average */ if (nsens_zone == 0) max_excess_zone = average_excess; /* * Scale the fan linearly in the max temperature in its * thermal zone. */ max_excess_zone = ulmin(max_excess_zone, 100); fan_speed = max_excess_zone * (fan->fan->max_rpm - fan->fan->min_rpm)/100 + fan->fan->min_rpm; if (fan_speed >= fan->last_val) { fan->timer = FAN_HYSTERESIS_TIMER; fan->last_val = fan_speed; } else { fan->timer--; if (fan->timer == 0) { fan->last_val = fan_speed; fan->timer = FAN_HYSTERESIS_TIMER; } } fan->fan->set(fan->fan, fan->last_val); } } void thermal_fan_register(struct thermal_fan *fan) { struct thermal_fan_le *list_entry; thermal_thread_init(); /* first caller inits our thread */ list_entry = malloc(sizeof(struct thermal_fan_le), M_DEVBUF, M_ZERO | M_WAITOK); list_entry->fan = fan; SLIST_INSERT_HEAD(&fans, list_entry, entries); } void thermal_sensor_register(struct thermal_temp *sensor) { struct thermal_sens_le *list_entry; thermal_thread_init(); /* first caller inits our thread */ list_entry = malloc(sizeof(struct thermal_sens_le), M_DEVBUF, 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); }