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}