LXR linux/drivers/gpu/drm/nouveau/nvkm/subdev/therm/temp.c

   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
  26static void
  27nvkm_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
  44static void
  45nvkm_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 ! */
  57void
  58nvkm_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 ! */
  66enum nvkm_therm_thrs_state
  67nvkm_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
  73static void
  74nv_poweroff_work(struct work_struct *work)
  75{
  76        orderly_poweroff(true);
  77        kfree(work);
  78}
  79
  80void
  81nvkm_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 ! */
 136static void
 137nvkm_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
 161static void
 162alarm_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
 192void
 193nvkm_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
 211int
 212nvkm_therm_sensor_init(struct nvkm_therm *therm)
 213{
 214        therm->func->program_alarms(therm);
 215        return 0;
 216}
 217
 218int
 219nvkm_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
 227void
 228nvkm_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
 238int
 239nvkm_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}
 254