subdev/therm/temp.c

0001 /*
0002  * Copyright 2012 The Nouveau community
0003  *
0004  * Permission is hereby granted, free of charge, to any person obtaining a
0005  * copy of this software and associated documentation files (the "Software"),
0006  * to deal in the Software without restriction, including without limitation
0007  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
0008  * and/or sell copies of the Software, and to permit persons to whom the
0009  * Software is furnished to do so, subject to the following conditions:
0010  *
0011  * The above copyright notice and this permission notice shall be included in
0012  * all copies or substantial portions of the Software.
0013  *
0014  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
0015  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
0016  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
0017  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
0018  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
0019  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
0020  * OTHER DEALINGS IN THE SOFTWARE.
0021  *
0022  * Authors: Martin Peres
0023  */
0024 #include "priv.h"
0025
0026 static void
0027 nvkm_therm_temp_set_defaults(struct nvkm_therm *therm)
0028 {
0029     therm->bios_sensor.offset_constant = 0;
0030
0031     therm->bios_sensor.thrs_fan_boost.temp = 90;
0032     therm->bios_sensor.thrs_fan_boost.hysteresis = 3;
0033
0034     therm->bios_sensor.thrs_down_clock.temp = 95;
0035     therm->bios_sensor.thrs_down_clock.hysteresis = 3;
0036
0037     therm->bios_sensor.thrs_critical.temp = 105;
0038     therm->bios_sensor.thrs_critical.hysteresis = 5;
0039
0040     therm->bios_sensor.thrs_shutdown.temp = 135;
0041     therm->bios_sensor.thrs_shutdown.hysteresis = 5; /*not that it matters */
0042 }
0043
0044 static void
0045 nvkm_therm_temp_safety_checks(struct nvkm_therm *therm)
0046 {
0047     struct nvbios_therm_sensor *s = &therm->bios_sensor;
0048
0049     /* enforce a minimum hysteresis on thresholds */
0050     s->thrs_fan_boost.hysteresis = max_t(u8, s->thrs_fan_boost.hysteresis, 2);
0051     s->thrs_down_clock.hysteresis = max_t(u8, s->thrs_down_clock.hysteresis, 2);
0052     s->thrs_critical.hysteresis = max_t(u8, s->thrs_critical.hysteresis, 2);
0053     s->thrs_shutdown.hysteresis = max_t(u8, s->thrs_shutdown.hysteresis, 2);
0054 }
0055
0056 /* must be called with alarm_program_lock taken ! */
0057 void
0058 nvkm_therm_sensor_set_threshold_state(struct nvkm_therm *therm,
0059                       enum nvkm_therm_thrs thrs,
0060                       enum nvkm_therm_thrs_state st)
0061 {
0062     therm->sensor.alarm_state[thrs] = st;
0063 }
0064
0065 /* must be called with alarm_program_lock taken ! */
0066 enum nvkm_therm_thrs_state
0067 nvkm_therm_sensor_get_threshold_state(struct nvkm_therm *therm,
0068                       enum nvkm_therm_thrs thrs)
0069 {
0070     return therm->sensor.alarm_state[thrs];
0071 }
0072
0073 static void
0074 nv_poweroff_work(struct work_struct *work)
0075 {
0076     orderly_poweroff(true);
0077     kfree(work);
0078 }
0079
0080 void
0081 nvkm_therm_sensor_event(struct nvkm_therm *therm, enum nvkm_therm_thrs thrs,
0082             enum nvkm_therm_thrs_direction dir)
0083 {
0084     struct nvkm_subdev *subdev = &therm->subdev;
0085     bool active;
0086     static const char * const thresholds[] = {
0087         "fanboost", "downclock", "critical", "shutdown"
0088     };
0089     int temperature = therm->func->temp_get(therm);
0090
0091     if (thrs < 0 || thrs > 3)
0092         return;
0093
0094     if (dir == NVKM_THERM_THRS_FALLING)
0095         nvkm_info(subdev,
0096               "temperature (%i C) went below the '%s' threshold\n",
0097               temperature, thresholds[thrs]);
0098     else
0099         nvkm_info(subdev, "temperature (%i C) hit the '%s' threshold\n",
0100               temperature, thresholds[thrs]);
0101
0102     active = (dir == NVKM_THERM_THRS_RISING);
0103     switch (thrs) {
0104     case NVKM_THERM_THRS_FANBOOST:
0105         if (active) {
0106             nvkm_therm_fan_set(therm, true, 100);
0107             nvkm_therm_fan_mode(therm, NVKM_THERM_CTRL_AUTO);
0108         }
0109         break;
0110     case NVKM_THERM_THRS_DOWNCLOCK:
0111         if (therm->emergency.downclock)
0112             therm->emergency.downclock(therm, active);
0113         break;
0114     case NVKM_THERM_THRS_CRITICAL:
0115         if (therm->emergency.pause)
0116             therm->emergency.pause(therm, active);
0117         break;
0118     case NVKM_THERM_THRS_SHUTDOWN:
0119         if (active) {
0120             struct work_struct *work;
0121
0122             work = kmalloc(sizeof(*work), GFP_ATOMIC);
0123             if (work) {
0124                 INIT_WORK(work, nv_poweroff_work);
0125                 schedule_work(work);
0126             }
0127         }
0128         break;
0129     case NVKM_THERM_THRS_NR:
0130         break;
0131     }
0132
0133 }
0134
0135 /* must be called with alarm_program_lock taken ! */
0136 static void
0137 nvkm_therm_threshold_hyst_polling(struct nvkm_therm *therm,
0138                   const struct nvbios_therm_threshold *thrs,
0139                   enum nvkm_therm_thrs thrs_name)
0140 {
0141     enum nvkm_therm_thrs_direction direction;
0142     enum nvkm_therm_thrs_state prev_state, new_state;
0143     int temp = therm->func->temp_get(therm);
0144
0145     prev_state = nvkm_therm_sensor_get_threshold_state(therm, thrs_name);
0146
0147     if (temp >= thrs->temp && prev_state == NVKM_THERM_THRS_LOWER) {
0148         direction = NVKM_THERM_THRS_RISING;
0149         new_state = NVKM_THERM_THRS_HIGHER;
0150     } else if (temp <= thrs->temp - thrs->hysteresis &&
0151             prev_state == NVKM_THERM_THRS_HIGHER) {
0152         direction = NVKM_THERM_THRS_FALLING;
0153         new_state = NVKM_THERM_THRS_LOWER;
0154     } else
0155         return; /* nothing to do */
0156
0157     nvkm_therm_sensor_set_threshold_state(therm, thrs_name, new_state);
0158     nvkm_therm_sensor_event(therm, thrs_name, direction);
0159 }
0160
0161 static void
0162 alarm_timer_callback(struct nvkm_alarm *alarm)
0163 {
0164     struct nvkm_therm *therm =
0165         container_of(alarm, struct nvkm_therm, sensor.therm_poll_alarm);
0166     struct nvbios_therm_sensor *sensor = &therm->bios_sensor;
0167     struct nvkm_timer *tmr = therm->subdev.device->timer;
0168     unsigned long flags;
0169
0170     spin_lock_irqsave(&therm->sensor.alarm_program_lock, flags);
0171
0172     nvkm_therm_threshold_hyst_polling(therm, &sensor->thrs_fan_boost,
0173                       NVKM_THERM_THRS_FANBOOST);
0174
0175     nvkm_therm_threshold_hyst_polling(therm,
0176                       &sensor->thrs_down_clock,
0177                       NVKM_THERM_THRS_DOWNCLOCK);
0178
0179     nvkm_therm_threshold_hyst_polling(therm, &sensor->thrs_critical,
0180                       NVKM_THERM_THRS_CRITICAL);
0181
0182     nvkm_therm_threshold_hyst_polling(therm, &sensor->thrs_shutdown,
0183                       NVKM_THERM_THRS_SHUTDOWN);
0184
0185     spin_unlock_irqrestore(&therm->sensor.alarm_program_lock, flags);
0186
0187     /* schedule the next poll in one second */
0188     if (therm->func->temp_get(therm) >= 0)
0189         nvkm_timer_alarm(tmr, 1000000000ULL, alarm);
0190 }
0191
0192 void
0193 nvkm_therm_program_alarms_polling(struct nvkm_therm *therm)
0194 {
0195     struct nvbios_therm_sensor *sensor = &therm->bios_sensor;
0196
0197     nvkm_debug(&therm->subdev,
0198            "programmed thresholds [ %d(%d), %d(%d), %d(%d), %d(%d) ]\n",
0199            sensor->thrs_fan_boost.temp,
0200            sensor->thrs_fan_boost.hysteresis,
0201            sensor->thrs_down_clock.temp,
0202            sensor->thrs_down_clock.hysteresis,
0203            sensor->thrs_critical.temp,
0204            sensor->thrs_critical.hysteresis,
0205            sensor->thrs_shutdown.temp,
0206            sensor->thrs_shutdown.hysteresis);
0207
0208     alarm_timer_callback(&therm->sensor.therm_poll_alarm);
0209 }
0210
0211 int
0212 nvkm_therm_sensor_init(struct nvkm_therm *therm)
0213 {
0214     therm->func->program_alarms(therm);
0215     return 0;
0216 }
0217
0218 int
0219 nvkm_therm_sensor_fini(struct nvkm_therm *therm, bool suspend)
0220 {
0221     struct nvkm_timer *tmr = therm->subdev.device->timer;
0222     if (suspend)
0223         nvkm_timer_alarm(tmr, 0, &therm->sensor.therm_poll_alarm);
0224     return 0;
0225 }
0226
0227 void
0228 nvkm_therm_sensor_preinit(struct nvkm_therm *therm)
0229 {
0230     const char *sensor_avail = "yes";
0231
0232     if (therm->func->temp_get(therm) < 0)
0233         sensor_avail = "no";
0234
0235     nvkm_debug(&therm->subdev, "internal sensor: %s\n", sensor_avail);
0236 }
0237
0238 int
0239 nvkm_therm_sensor_ctor(struct nvkm_therm *therm)
0240 {
0241     struct nvkm_subdev *subdev = &therm->subdev;
0242     struct nvkm_bios *bios = subdev->device->bios;
0243
0244     nvkm_alarm_init(&therm->sensor.therm_poll_alarm, alarm_timer_callback);
0245
0246     nvkm_therm_temp_set_defaults(therm);
0247     if (nvbios_therm_sensor_parse(bios, NVBIOS_THERM_DOMAIN_CORE,
0248                       &therm->bios_sensor))
0249         nvkm_error(subdev, "nvbios_therm_sensor_parse failed\n");
0250     nvkm_therm_temp_safety_checks(therm);
0251
0252     return 0;
0253 }