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

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/nouveau/nvkm/subdev/therm/temp.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/nouveau/nvkm/subdev/therm/temp.c
Extension
.c
Size
7567 bytes
Lines
254
Domain
Driver Families
Bucket
drivers/gpu
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

if (active) {
			nvkm_therm_fan_set(therm, true, 100);
			nvkm_therm_fan_mode(therm, NVKM_THERM_CTRL_AUTO);
		}
		break;
	case NVKM_THERM_THRS_DOWNCLOCK:
		if (therm->emergency.downclock)
			therm->emergency.downclock(therm, active);
		break;
	case NVKM_THERM_THRS_CRITICAL:
		if (therm->emergency.pause)
			therm->emergency.pause(therm, active);
		break;
	case NVKM_THERM_THRS_SHUTDOWN:
		if (active) {
			struct work_struct *work;

			work = kmalloc_obj(*work, GFP_ATOMIC);
			if (work) {
				INIT_WORK(work, nv_poweroff_work);
				schedule_work(work);
			}
		}
		break;
	case NVKM_THERM_THRS_NR:
		break;
	}

}

/* must be called with alarm_program_lock taken ! */
static void
nvkm_therm_threshold_hyst_polling(struct nvkm_therm *therm,
				  const struct nvbios_therm_threshold *thrs,
				  enum nvkm_therm_thrs thrs_name)
{
	enum nvkm_therm_thrs_direction direction;
	enum nvkm_therm_thrs_state prev_state, new_state;
	int temp = therm->func->temp_get(therm);

	prev_state = nvkm_therm_sensor_get_threshold_state(therm, thrs_name);

	if (temp >= thrs->temp && prev_state == NVKM_THERM_THRS_LOWER) {
		direction = NVKM_THERM_THRS_RISING;
		new_state = NVKM_THERM_THRS_HIGHER;
	} else if (temp <= thrs->temp - thrs->hysteresis &&
			prev_state == NVKM_THERM_THRS_HIGHER) {
		direction = NVKM_THERM_THRS_FALLING;
		new_state = NVKM_THERM_THRS_LOWER;
	} else
		return; /* nothing to do */

	nvkm_therm_sensor_set_threshold_state(therm, thrs_name, new_state);
	nvkm_therm_sensor_event(therm, thrs_name, direction);
}

static void
alarm_timer_callback(struct nvkm_alarm *alarm)
{
	struct nvkm_therm *therm =
		container_of(alarm, struct nvkm_therm, sensor.therm_poll_alarm);
	struct nvbios_therm_sensor *sensor = &therm->bios_sensor;
	struct nvkm_timer *tmr = therm->subdev.device->timer;
	unsigned long flags;

	spin_lock_irqsave(&therm->sensor.alarm_program_lock, flags);

	nvkm_therm_threshold_hyst_polling(therm, &sensor->thrs_fan_boost,
					  NVKM_THERM_THRS_FANBOOST);

	nvkm_therm_threshold_hyst_polling(therm,
					  &sensor->thrs_down_clock,
					  NVKM_THERM_THRS_DOWNCLOCK);

	nvkm_therm_threshold_hyst_polling(therm, &sensor->thrs_critical,
					  NVKM_THERM_THRS_CRITICAL);

	nvkm_therm_threshold_hyst_polling(therm, &sensor->thrs_shutdown,
					  NVKM_THERM_THRS_SHUTDOWN);

	spin_unlock_irqrestore(&therm->sensor.alarm_program_lock, flags);

	/* schedule the next poll in one second */
	if (therm->func->temp_get(therm) >= 0)
		nvkm_timer_alarm(tmr, 1000000000ULL, alarm);
}

void
nvkm_therm_program_alarms_polling(struct nvkm_therm *therm)
{

Annotation

Implementation Notes