nouveau_nvkm_subdev_therm_temp.c revision 1.1 
1/*	$NetBSD: nouveau_nvkm_subdev_therm_temp.c,v 1.1 2018/08/27 01:34:56 riastradh Exp $	*/
2
3/*
4 * Copyright 2012 The Nouveau community
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
19 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
20 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
21 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
22 * OTHER DEALINGS IN THE SOFTWARE.
23 *
24 * Authors: Martin Peres
25 */
26#include <sys/cdefs.h>
27__KERNEL_RCSID(0, "$NetBSD: nouveau_nvkm_subdev_therm_temp.c,v 1.1 2018/08/27 01:34:56 riastradh Exp $");
28
29#include "priv.h"
30
31static void
32nvkm_therm_temp_set_defaults(struct nvkm_therm *therm)
33{
34	therm->bios_sensor.offset_constant = 0;
35
36	therm->bios_sensor.thrs_fan_boost.temp = 90;
37	therm->bios_sensor.thrs_fan_boost.hysteresis = 3;
38
39	therm->bios_sensor.thrs_down_clock.temp = 95;
40	therm->bios_sensor.thrs_down_clock.hysteresis = 3;
41
42	therm->bios_sensor.thrs_critical.temp = 105;
43	therm->bios_sensor.thrs_critical.hysteresis = 5;
44
45	therm->bios_sensor.thrs_shutdown.temp = 135;
46	therm->bios_sensor.thrs_shutdown.hysteresis = 5; /*not that it matters */
47}
48
49static void
50nvkm_therm_temp_safety_checks(struct nvkm_therm *therm)
51{
52	struct nvbios_therm_sensor *s = &therm->bios_sensor;
53
54	/* enforce a minimum hysteresis on thresholds */
55	s->thrs_fan_boost.hysteresis = max_t(u8, s->thrs_fan_boost.hysteresis, 2);
56	s->thrs_down_clock.hysteresis = max_t(u8, s->thrs_down_clock.hysteresis, 2);
57	s->thrs_critical.hysteresis = max_t(u8, s->thrs_critical.hysteresis, 2);
58	s->thrs_shutdown.hysteresis = max_t(u8, s->thrs_shutdown.hysteresis, 2);
59}
60
61/* must be called with alarm_program_lock taken ! */
62void
63nvkm_therm_sensor_set_threshold_state(struct nvkm_therm *therm,
64				      enum nvkm_therm_thrs thrs,
65				      enum nvkm_therm_thrs_state st)
66{
67	therm->sensor.alarm_state[thrs] = st;
68}
69
70/* must be called with alarm_program_lock taken ! */
71enum nvkm_therm_thrs_state
72nvkm_therm_sensor_get_threshold_state(struct nvkm_therm *therm,
73				      enum nvkm_therm_thrs thrs)
74{
75	return therm->sensor.alarm_state[thrs];
76}
77
78static void
79nv_poweroff_work(struct work_struct *work)
80{
81	orderly_poweroff(true);
82	kfree(work);
83}
84
85void
86nvkm_therm_sensor_event(struct nvkm_therm *therm, enum nvkm_therm_thrs thrs,
87			enum nvkm_therm_thrs_direction dir)
88{
89	struct nvkm_subdev *subdev = &therm->subdev;
90	bool active;
91	const char *thresolds[] = {
92		"fanboost", "downclock", "critical", "shutdown"
93	};
94	int temperature = therm->func->temp_get(therm);
95
96	if (thrs < 0 || thrs > 3)
97		return;
98
99	if (dir == NVKM_THERM_THRS_FALLING)
100		nvkm_info(subdev,
101			  "temperature (%i C) went below the '%s' threshold\n",
102			  temperature, thresolds[thrs]);
103	else
104		nvkm_info(subdev, "temperature (%i C) hit the '%s' threshold\n",
105			  temperature, thresolds[thrs]);
106
107	active = (dir == NVKM_THERM_THRS_RISING);
108	switch (thrs) {
109	case NVKM_THERM_THRS_FANBOOST:
110		if (active) {
111			nvkm_therm_fan_set(therm, true, 100);
112			nvkm_therm_fan_mode(therm, NVKM_THERM_CTRL_AUTO);
113		}
114		break;
115	case NVKM_THERM_THRS_DOWNCLOCK:
116		if (therm->emergency.downclock)
117			therm->emergency.downclock(therm, active);
118		break;
119	case NVKM_THERM_THRS_CRITICAL:
120		if (therm->emergency.pause)
121			therm->emergency.pause(therm, active);
122		break;
123	case NVKM_THERM_THRS_SHUTDOWN:
124		if (active) {
125			struct work_struct *work;
126
127			work = kmalloc(sizeof(*work), GFP_ATOMIC);
128			if (work) {
129				INIT_WORK(work, nv_poweroff_work);
130				schedule_work(work);
131			}
132		}
133		break;
134	case NVKM_THERM_THRS_NR:
135		break;
136	}
137
138}
139
140/* must be called with alarm_program_lock taken ! */
141static void
142nvkm_therm_threshold_hyst_polling(struct nvkm_therm *therm,
143				  const struct nvbios_therm_threshold *thrs,
144				  enum nvkm_therm_thrs thrs_name)
145{
146	enum nvkm_therm_thrs_direction direction;
147	enum nvkm_therm_thrs_state prev_state, new_state;
148	int temp = therm->func->temp_get(therm);
149
150	prev_state = nvkm_therm_sensor_get_threshold_state(therm, thrs_name);
151
152	if (temp >= thrs->temp && prev_state == NVKM_THERM_THRS_LOWER) {
153		direction = NVKM_THERM_THRS_RISING;
154		new_state = NVKM_THERM_THRS_HIGHER;
155	} else if (temp <= thrs->temp - thrs->hysteresis &&
156			prev_state == NVKM_THERM_THRS_HIGHER) {
157		direction = NVKM_THERM_THRS_FALLING;
158		new_state = NVKM_THERM_THRS_LOWER;
159	} else
160		return; /* nothing to do */
161
162	nvkm_therm_sensor_set_threshold_state(therm, thrs_name, new_state);
163	nvkm_therm_sensor_event(therm, thrs_name, direction);
164}
165
166static void
167alarm_timer_callback(struct nvkm_alarm *alarm)
168{
169	struct nvkm_therm *therm =
170		container_of(alarm, struct nvkm_therm, sensor.therm_poll_alarm);
171	struct nvbios_therm_sensor *sensor = &therm->bios_sensor;
172	struct nvkm_timer *tmr = therm->subdev.device->timer;
173	unsigned long flags;
174
175	spin_lock_irqsave(&therm->sensor.alarm_program_lock, flags);
176
177	nvkm_therm_threshold_hyst_polling(therm, &sensor->thrs_fan_boost,
178					  NVKM_THERM_THRS_FANBOOST);
179
180	nvkm_therm_threshold_hyst_polling(therm,
181					  &sensor->thrs_down_clock,
182					  NVKM_THERM_THRS_DOWNCLOCK);
183
184	nvkm_therm_threshold_hyst_polling(therm, &sensor->thrs_critical,
185					  NVKM_THERM_THRS_CRITICAL);
186
187	nvkm_therm_threshold_hyst_polling(therm, &sensor->thrs_shutdown,
188					  NVKM_THERM_THRS_SHUTDOWN);
189
190	spin_unlock_irqrestore(&therm->sensor.alarm_program_lock, flags);
191
192	/* schedule the next poll in one second */
193	if (therm->func->temp_get(therm) >= 0)
194		nvkm_timer_alarm(tmr, 1000000000ULL, alarm);
195}
196
197void
198nvkm_therm_program_alarms_polling(struct nvkm_therm *therm)
199{
200	struct nvbios_therm_sensor *sensor = &therm->bios_sensor;
201
202	nvkm_debug(&therm->subdev,
203		   "programmed thresholds [ %d(%d), %d(%d), %d(%d), %d(%d) ]\n",
204		   sensor->thrs_fan_boost.temp,
205		   sensor->thrs_fan_boost.hysteresis,
206		   sensor->thrs_down_clock.temp,
207		   sensor->thrs_down_clock.hysteresis,
208		   sensor->thrs_critical.temp,
209		   sensor->thrs_critical.hysteresis,
210		   sensor->thrs_shutdown.temp,
211		   sensor->thrs_shutdown.hysteresis);
212
213	alarm_timer_callback(&therm->sensor.therm_poll_alarm);
214}
215
216int
217nvkm_therm_sensor_init(struct nvkm_therm *therm)
218{
219	therm->func->program_alarms(therm);
220	return 0;
221}
222
223int
224nvkm_therm_sensor_fini(struct nvkm_therm *therm, bool suspend)
225{
226	struct nvkm_timer *tmr = therm->subdev.device->timer;
227	if (suspend)
228		nvkm_timer_alarm_cancel(tmr, &therm->sensor.therm_poll_alarm);
229	return 0;
230}
231
232void
233nvkm_therm_sensor_preinit(struct nvkm_therm *therm)
234{
235	const char *sensor_avail = "yes";
236
237	if (therm->func->temp_get(therm) < 0)
238		sensor_avail = "no";
239
240	nvkm_debug(&therm->subdev, "internal sensor: %s\n", sensor_avail);
241}
242
243int
244nvkm_therm_sensor_ctor(struct nvkm_therm *therm)
245{
246	struct nvkm_subdev *subdev = &therm->subdev;
247	struct nvkm_bios *bios = subdev->device->bios;
248
249	nvkm_alarm_init(&therm->sensor.therm_poll_alarm, alarm_timer_callback);
250
251	nvkm_therm_temp_set_defaults(therm);
252	if (nvbios_therm_sensor_parse(bios, NVBIOS_THERM_DOMAIN_CORE,
253				      &therm->bios_sensor))
254		nvkm_error(subdev, "nvbios_therm_sensor_parse failed\n");
255	nvkm_therm_temp_safety_checks(therm);
256
257	return 0;
258}
259