root/drivers/gpu/drm/nouveau/nvkm/subdev/therm/temp.c

DEFINITIONS

1. nvkm_therm_temp_set_defaults
2. nvkm_therm_temp_safety_checks
3. nvkm_therm_sensor_set_threshold_state
4. nvkm_therm_sensor_get_threshold_state
5. nv_poweroff_work
6. nvkm_therm_sensor_event
7. nvkm_therm_threshold_hyst_polling
8. alarm_timer_callback
9. nvkm_therm_program_alarms_polling
10. nvkm_therm_sensor_init
11. nvkm_therm_sensor_fini
12. nvkm_therm_sensor_preinit
13. nvkm_therm_sensor_ctor

   1 /*
   2  * Copyright 2012 The Nouveau community
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice shall be included in
  12  * all copies or substantial portions of the Software.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  17  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  18  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  19  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  20  * OTHER DEALINGS IN THE SOFTWARE.
  21  *
  22  * Authors: Martin Peres
  23  */
  24 #include "priv.h"
  25 
  26 static void
  27 nvkm_therm_temp_set_defaults(struct nvkm_therm *therm)
  28 {
  29         therm->bios_sensor.offset_constant = 0;
  30 
  31         therm->bios_sensor.thrs_fan_boost.temp = 90;
  32         therm->bios_sensor.thrs_fan_boost.hysteresis = 3;
  33 
  34         therm->bios_sensor.thrs_down_clock.temp = 95;
  35         therm->bios_sensor.thrs_down_clock.hysteresis = 3;
  36 
  37         therm->bios_sensor.thrs_critical.temp = 105;
  38         therm->bios_sensor.thrs_critical.hysteresis = 5;
  39 
  40         therm->bios_sensor.thrs_shutdown.temp = 135;
  41         therm->bios_sensor.thrs_shutdown.hysteresis = 5; /*not that it matters */
  42 }
  43 
  44 static void
  45 nvkm_therm_temp_safety_checks(struct nvkm_therm *therm)
  46 {
  47         struct nvbios_therm_sensor *s = &therm->bios_sensor;
  48 
  49         /* enforce a minimum hysteresis on thresholds */
  50         s->thrs_fan_boost.hysteresis = max_t(u8, s->thrs_fan_boost.hysteresis, 2);
  51         s->thrs_down_clock.hysteresis = max_t(u8, s->thrs_down_clock.hysteresis, 2);
  52         s->thrs_critical.hysteresis = max_t(u8, s->thrs_critical.hysteresis, 2);
  53         s->thrs_shutdown.hysteresis = max_t(u8, s->thrs_shutdown.hysteresis, 2);
  54 }
  55 
  56 /* must be called with alarm_program_lock taken ! */
  57 void
  58 nvkm_therm_sensor_set_threshold_state(struct nvkm_therm *therm,
  59                                       enum nvkm_therm_thrs thrs,
  60                                       enum nvkm_therm_thrs_state st)
  61 {
  62         therm->sensor.alarm_state[thrs] = st;
  63 }
  64 
  65 /* must be called with alarm_program_lock taken ! */
  66 enum nvkm_therm_thrs_state
  67 nvkm_therm_sensor_get_threshold_state(struct nvkm_therm *therm,
  68                                       enum nvkm_therm_thrs thrs)
  69 {
  70         return therm->sensor.alarm_state[thrs];
  71 }
  72 
  73 static void
  74 nv_poweroff_work(struct work_struct *work)
  75 {
  76         orderly_poweroff(true);
  77         kfree(work);
  78 }
  79 
  80 void
  81 nvkm_therm_sensor_event(struct nvkm_therm *therm, enum nvkm_therm_thrs thrs,
  82                         enum nvkm_therm_thrs_direction dir)
  83 {
  84         struct nvkm_subdev *subdev = &therm->subdev;
  85         bool active;
  86         static const char * const thresholds[] = {
  87                 "fanboost", "downclock", "critical", "shutdown"
  88         };
  89         int temperature = therm->func->temp_get(therm);
  90 
  91         if (thrs < 0 || thrs > 3)
  92                 return;
  93 
  94         if (dir == NVKM_THERM_THRS_FALLING)
  95                 nvkm_info(subdev,
  96                           "temperature (%i C) went below the '%s' threshold\n",
  97                           temperature, thresholds[thrs]);
  98         else
  99                 nvkm_info(subdev, "temperature (%i C) hit the '%s' threshold\n",
 100                           temperature, thresholds[thrs]);
 101 
 102         active = (dir == NVKM_THERM_THRS_RISING);
 103         switch (thrs) {
 104         case NVKM_THERM_THRS_FANBOOST:
 105                 if (active) {
 106                         nvkm_therm_fan_set(therm, true, 100);
 107                         nvkm_therm_fan_mode(therm, NVKM_THERM_CTRL_AUTO);
 108                 }
 109                 break;
 110         case NVKM_THERM_THRS_DOWNCLOCK:
 111                 if (therm->emergency.downclock)
 112                         therm->emergency.downclock(therm, active);
 113                 break;
 114         case NVKM_THERM_THRS_CRITICAL:
 115                 if (therm->emergency.pause)
 116                         therm->emergency.pause(therm, active);
 117                 break;
 118         case NVKM_THERM_THRS_SHUTDOWN:
 119                 if (active) {
 120                         struct work_struct *work;
 121 
 122                         work = kmalloc(sizeof(*work), GFP_ATOMIC);
 123                         if (work) {
 124                                 INIT_WORK(work, nv_poweroff_work);
 125                                 schedule_work(work);
 126                         }
 127                 }
 128                 break;
 129         case NVKM_THERM_THRS_NR:
 130                 break;
 131         }
 132 
 133 }
 134 
 135 /* must be called with alarm_program_lock taken ! */
 136 static void
 137 nvkm_therm_threshold_hyst_polling(struct nvkm_therm *therm,
 138                                   const struct nvbios_therm_threshold *thrs,
 139                                   enum nvkm_therm_thrs thrs_name)
 140 {
 141         enum nvkm_therm_thrs_direction direction;
 142         enum nvkm_therm_thrs_state prev_state, new_state;
 143         int temp = therm->func->temp_get(therm);
 144 
 145         prev_state = nvkm_therm_sensor_get_threshold_state(therm, thrs_name);
 146 
 147         if (temp >= thrs->temp && prev_state == NVKM_THERM_THRS_LOWER) {
 148                 direction = NVKM_THERM_THRS_RISING;
 149                 new_state = NVKM_THERM_THRS_HIGHER;
 150         } else if (temp <= thrs->temp - thrs->hysteresis &&
 151                         prev_state == NVKM_THERM_THRS_HIGHER) {
 152                 direction = NVKM_THERM_THRS_FALLING;
 153                 new_state = NVKM_THERM_THRS_LOWER;
 154         } else
 155                 return; /* nothing to do */
 156 
 157         nvkm_therm_sensor_set_threshold_state(therm, thrs_name, new_state);
 158         nvkm_therm_sensor_event(therm, thrs_name, direction);
 159 }
 160 
 161 static void
 162 alarm_timer_callback(struct nvkm_alarm *alarm)
 163 {
 164         struct nvkm_therm *therm =
 165                 container_of(alarm, struct nvkm_therm, sensor.therm_poll_alarm);
 166         struct nvbios_therm_sensor *sensor = &therm->bios_sensor;
 167         struct nvkm_timer *tmr = therm->subdev.device->timer;
 168         unsigned long flags;
 169 
 170         spin_lock_irqsave(&therm->sensor.alarm_program_lock, flags);
 171 
 172         nvkm_therm_threshold_hyst_polling(therm, &sensor->thrs_fan_boost,
 173                                           NVKM_THERM_THRS_FANBOOST);
 174 
 175         nvkm_therm_threshold_hyst_polling(therm,
 176                                           &sensor->thrs_down_clock,
 177                                           NVKM_THERM_THRS_DOWNCLOCK);
 178 
 179         nvkm_therm_threshold_hyst_polling(therm, &sensor->thrs_critical,
 180                                           NVKM_THERM_THRS_CRITICAL);
 181 
 182         nvkm_therm_threshold_hyst_polling(therm, &sensor->thrs_shutdown,
 183                                           NVKM_THERM_THRS_SHUTDOWN);
 184 
 185         spin_unlock_irqrestore(&therm->sensor.alarm_program_lock, flags);
 186 
 187         /* schedule the next poll in one second */
 188         if (therm->func->temp_get(therm) >= 0)
 189                 nvkm_timer_alarm(tmr, 1000000000ULL, alarm);
 190 }
 191 
 192 void
 193 nvkm_therm_program_alarms_polling(struct nvkm_therm *therm)
 194 {
 195         struct nvbios_therm_sensor *sensor = &therm->bios_sensor;
 196 
 197         nvkm_debug(&therm->subdev,
 198                    "programmed thresholds [ %d(%d), %d(%d), %d(%d), %d(%d) ]\n",
 199                    sensor->thrs_fan_boost.temp,
 200                    sensor->thrs_fan_boost.hysteresis,
 201                    sensor->thrs_down_clock.temp,
 202                    sensor->thrs_down_clock.hysteresis,
 203                    sensor->thrs_critical.temp,
 204                    sensor->thrs_critical.hysteresis,
 205                    sensor->thrs_shutdown.temp,
 206                    sensor->thrs_shutdown.hysteresis);
 207 
 208         alarm_timer_callback(&therm->sensor.therm_poll_alarm);
 209 }
 210 
 211 int
 212 nvkm_therm_sensor_init(struct nvkm_therm *therm)
 213 {
 214         therm->func->program_alarms(therm);
 215         return 0;
 216 }
 217 
 218 int
 219 nvkm_therm_sensor_fini(struct nvkm_therm *therm, bool suspend)
 220 {
 221         struct nvkm_timer *tmr = therm->subdev.device->timer;
 222         if (suspend)
 223                 nvkm_timer_alarm(tmr, 0, &therm->sensor.therm_poll_alarm);
 224         return 0;
 225 }
 226 
 227 void
 228 nvkm_therm_sensor_preinit(struct nvkm_therm *therm)
 229 {
 230         const char *sensor_avail = "yes";
 231 
 232         if (therm->func->temp_get(therm) < 0)
 233                 sensor_avail = "no";
 234 
 235         nvkm_debug(&therm->subdev, "internal sensor: %s\n", sensor_avail);
 236 }
 237 
 238 int
 239 nvkm_therm_sensor_ctor(struct nvkm_therm *therm)
 240 {
 241         struct nvkm_subdev *subdev = &therm->subdev;
 242         struct nvkm_bios *bios = subdev->device->bios;
 243 
 244         nvkm_alarm_init(&therm->sensor.therm_poll_alarm, alarm_timer_callback);
 245 
 246         nvkm_therm_temp_set_defaults(therm);
 247         if (nvbios_therm_sensor_parse(bios, NVBIOS_THERM_DOMAIN_CORE,
 248                                       &therm->bios_sensor))
 249                 nvkm_error(subdev, "nvbios_therm_sensor_parse failed\n");
 250         nvkm_therm_temp_safety_checks(therm);
 251 
 252         return 0;
 253 }