thermal.c

linux 内核源代码

		return -EINVAL;

	if (tz->temperature >= tz->trips.critical.temperature) {
		printk(KERN_WARNING PREFIX "Critical trip point\n");
		tz->trips.critical.flags.enabled = 1;
	} else if (tz->trips.critical.flags.enabled)
		tz->trips.critical.flags.enabled = 0;

	printk(KERN_EMERG
	       "Critical temperature reached (%ld C), shutting down.\n",
	       KELVIN_TO_CELSIUS(tz->temperature));
	acpi_bus_generate_proc_event(tz->device, ACPI_THERMAL_NOTIFY_CRITICAL,
				tz->trips.critical.flags.enabled);
	acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
					  tz->device->dev.bus_id,
					  ACPI_THERMAL_NOTIFY_CRITICAL,
					  tz->trips.critical.flags.enabled);

	orderly_poweroff(true);

	return 0;
}

static int acpi_thermal_hot(struct acpi_thermal *tz)
{
	if (!tz || !tz->trips.hot.flags.valid || nocrt)
		return -EINVAL;

	if (tz->temperature >= tz->trips.hot.temperature) {
		printk(KERN_WARNING PREFIX "Hot trip point\n");
		tz->trips.hot.flags.enabled = 1;
	} else if (tz->trips.hot.flags.enabled)
		tz->trips.hot.flags.enabled = 0;

	acpi_bus_generate_proc_event(tz->device, ACPI_THERMAL_NOTIFY_HOT,
				tz->trips.hot.flags.enabled);
	acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
					  tz->device->dev.bus_id,
					  ACPI_THERMAL_NOTIFY_HOT,
					  tz->trips.hot.flags.enabled);

	/* TBD: Call user-mode "sleep(S4)" function */

	return 0;
}

static void acpi_thermal_passive(struct acpi_thermal *tz)
{
	int result = 1;
	struct acpi_thermal_passive *passive = NULL;
	int trend = 0;
	int i = 0;


	if (!tz || !tz->trips.passive.flags.valid)
		return;

	passive = &(tz->trips.passive);

	/*
	 * Above Trip?
	 * -----------
	 * Calculate the thermal trend (using the passive cooling equation)
	 * and modify the performance limit for all passive cooling devices
	 * accordingly.  Note that we assume symmetry.
	 */
	if (tz->temperature >= passive->temperature) {
		trend =
		    (passive->tc1 * (tz->temperature - tz->last_temperature)) +
		    (passive->tc2 * (tz->temperature - passive->temperature));
		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
				  "trend[%d]=(tc1[%lu]*(tmp[%lu]-last[%lu]))+(tc2[%lu]*(tmp[%lu]-psv[%lu]))\n",
				  trend, passive->tc1, tz->temperature,
				  tz->last_temperature, passive->tc2,
				  tz->temperature, passive->temperature));
		passive->flags.enabled = 1;
		/* Heating up? */
		if (trend > 0)
			for (i = 0; i < passive->devices.count; i++)
				acpi_processor_set_thermal_limit(passive->
								 devices.
								 handles[i],
								 ACPI_PROCESSOR_LIMIT_INCREMENT);
		/* Cooling off? */
		else if (trend < 0) {
			for (i = 0; i < passive->devices.count; i++)
				/*
				 * assume that we are on highest
				 * freq/lowest thrott and can leave
				 * passive mode, even in error case
				 */
				if (!acpi_processor_set_thermal_limit
				    (passive->devices.handles[i],
				     ACPI_PROCESSOR_LIMIT_DECREMENT))
					result = 0;
			/*
			 * Leave cooling mode, even if the temp might
			 * higher than trip point This is because some
			 * machines might have long thermal polling
			 * frequencies (tsp) defined. We will fall back
			 * into passive mode in next cycle (probably quicker)
			 */
			if (result) {
				passive->flags.enabled = 0;
				ACPI_DEBUG_PRINT((ACPI_DB_INFO,
						  "Disabling passive cooling, still above threshold,"
						  " but we are cooling down\n"));
			}
		}
		return;
	}

	/*
	 * Below Trip?
	 * -----------
	 * Implement passive cooling hysteresis to slowly increase performance
	 * and avoid thrashing around the passive trip point.  Note that we
	 * assume symmetry.
	 */
	if (!passive->flags.enabled)
		return;
	for (i = 0; i < passive->devices.count; i++)
		if (!acpi_processor_set_thermal_limit
		    (passive->devices.handles[i],
		     ACPI_PROCESSOR_LIMIT_DECREMENT))
			result = 0;
	if (result) {
		passive->flags.enabled = 0;
		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
				  "Disabling passive cooling (zone is cool)\n"));
	}
}

static void acpi_thermal_active(struct acpi_thermal *tz)
{
	int result = 0;
	struct acpi_thermal_active *active = NULL;
	int i = 0;
	int j = 0;
	unsigned long maxtemp = 0;


	if (!tz)
		return;

	for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
		active = &(tz->trips.active[i]);
		if (!active || !active->flags.valid)
			break;
		if (tz->temperature >= active->temperature) {
			/*
			 * Above Threshold?
			 * ----------------
			 * If not already enabled, turn ON all cooling devices
			 * associated with this active threshold.
			 */
			if (active->temperature > maxtemp)
				tz->state.active_index = i;
			maxtemp = active->temperature;
			if (active->flags.enabled)
				continue;
			for (j = 0; j < active->devices.count; j++) {
				result =
				    acpi_bus_set_power(active->devices.
						       handles[j],
						       ACPI_STATE_D0);
				if (result) {
					printk(KERN_WARNING PREFIX
						      "Unable to turn cooling device [%p] 'on'\n",
						      active->devices.
						      handles[j]);
					continue;
				}
				active->flags.enabled = 1;
				ACPI_DEBUG_PRINT((ACPI_DB_INFO,
						  "Cooling device [%p] now 'on'\n",
						  active->devices.handles[j]));
			}
			continue;
		}
		if (!active->flags.enabled)
			continue;
		/*
		 * Below Threshold?
		 * ----------------
		 * Turn OFF all cooling devices associated with this
		 * threshold.
		 */
		for (j = 0; j < active->devices.count; j++) {
			result = acpi_bus_set_power(active->devices.handles[j],
						    ACPI_STATE_D3);
			if (result) {
				printk(KERN_WARNING PREFIX
					      "Unable to turn cooling device [%p] 'off'\n",
					      active->devices.handles[j]);
				continue;
			}
			active->flags.enabled = 0;
			ACPI_DEBUG_PRINT((ACPI_DB_INFO,
					  "Cooling device [%p] now 'off'\n",
					  active->devices.handles[j]));
		}
	}
}

static void acpi_thermal_check(void *context);

static void acpi_thermal_run(unsigned long data)
{
	struct acpi_thermal *tz = (struct acpi_thermal *)data;
	if (!tz->zombie)
		acpi_os_execute(OSL_GPE_HANDLER, acpi_thermal_check, (void *)data);
}

static void acpi_thermal_check(void *data)
{
	int result = 0;
	struct acpi_thermal *tz = data;
	unsigned long sleep_time = 0;
	unsigned long timeout_jiffies = 0;
	int i = 0;
	struct acpi_thermal_state state;


	if (!tz) {
		printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
		return;
	}

	/* Check if someone else is already running */
	if (!mutex_trylock(&tz->lock))
		return;

	state = tz->state;

	result = acpi_thermal_get_temperature(tz);
	if (result)
		goto unlock;

	memset(&tz->state, 0, sizeof(tz->state));

	/*
	 * Check Trip Points
	 * -----------------
	 * Compare the current temperature to the trip point values to see
	 * if we've entered one of the thermal policy states.  Note that
	 * this function determines when a state is entered, but the 
	 * individual policy decides when it is exited (e.g. hysteresis).
	 */
	if (tz->trips.critical.flags.valid)
		state.critical |=
		    (tz->temperature >= tz->trips.critical.temperature);
	if (tz->trips.hot.flags.valid)
		state.hot |= (tz->temperature >= tz->trips.hot.temperature);
	if (tz->trips.passive.flags.valid)
		state.passive |=
		    (tz->temperature >= tz->trips.passive.temperature);
	for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
		if (tz->trips.active[i].flags.valid)
			state.active |=
			    (tz->temperature >=
			     tz->trips.active[i].temperature);

	/*
	 * Invoke Policy
	 * -------------
	 * Separated from the above check to allow individual policy to 
	 * determine when to exit a given state.
	 */
	if (state.critical)
		acpi_thermal_critical(tz);
	if (state.hot)
		acpi_thermal_hot(tz);
	if (state.passive)
		acpi_thermal_passive(tz);
	if (state.active)
		acpi_thermal_active(tz);

	/*
	 * Calculate State
	 * ---------------
	 * Again, separated from the above two to allow independent policy
	 * decisions.
	 */
	tz->state.critical = tz->trips.critical.flags.enabled;
	tz->state.hot = tz->trips.hot.flags.enabled;
	tz->state.passive = tz->trips.passive.flags.enabled;
	tz->state.active = 0;
	for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
		tz->state.active |= tz->trips.active[i].flags.enabled;

	/*
	 * Calculate Sleep Time
	 * --------------------
	 * If we're in the passive state, use _TSP's value.  Otherwise
	 * use the default polling frequency (e.g. _TZP).  If no polling
	 * frequency is specified then we'll wait forever (at least until
	 * a thermal event occurs).  Note that _TSP and _TZD values are
	 * given in 1/10th seconds (we must covert to milliseconds).
	 */
	if (tz->state.passive) {
		sleep_time = tz->trips.passive.tsp * 100;
		timeout_jiffies =  jiffies + (HZ * sleep_time) / 1000;
	} else if (tz->polling_frequency > 0) {
		sleep_time = tz->polling_frequency * 100;
		timeout_jiffies =  round_jiffies(jiffies + (HZ * sleep_time) / 1000);
	}

	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s: temperature[%lu] sleep[%lu]\n",
			  tz->name, tz->temperature, sleep_time));

	/*
	 * Schedule Next Poll
	 * ------------------
	 */
	if (!sleep_time) {
		if (timer_pending(&(tz->timer)))
			del_timer(&(tz->timer));
	} else {
		if (timer_pending(&(tz->timer)))
			mod_timer(&(tz->timer), timeout_jiffies);
		else {
			tz->timer.data = (unsigned long)tz;
			tz->timer.function = acpi_thermal_run;
			tz->timer.expires = timeout_jiffies;
			add_timer(&(tz->timer));
		}
	}
      unlock:
	mutex_unlock(&tz->lock);
}

/* --------------------------------------------------------------------------
                              FS Interface (/proc)
   -------------------------------------------------------------------------- */

static struct proc_dir_entry *acpi_thermal_dir;

static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset)
{
	struct acpi_thermal *tz = seq->private;


	if (!tz)
		goto end;

	seq_puts(seq, "state:                   ");

	if (!tz->state.critical && !tz->state.hot && !tz->state.passive
	    && !tz->state.active)
		seq_puts(seq, "ok\n");
	else {
		if (tz->state.critical)
			seq_puts(seq, "critical ");
		if (tz->state.hot)
			seq_puts(seq, "hot ");
		if (tz->state.passive)
			seq_puts(seq, "passive ");
		if (tz->state.active)
			seq_printf(seq, "active[%d]", tz->state.active_index);
		seq_puts(seq, "\n");
	}

      end:
	return 0;
}

static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file)
{
	return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data);
}

static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset)
{
	int result = 0;
	struct acpi_thermal *tz = seq->private;


	if (!tz)
		goto end;

	result = acpi_thermal_get_temperature(tz);
	if (result)
		goto end;

	seq_printf(seq, "temperature:             %ld C\n",
		   KELVIN_TO_CELSIUS(tz->temperature));

      end:
	return 0;
}

static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file)
{
	return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data);
}

static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset)
{
	struct acpi_thermal *tz = seq->private;
	struct acpi_device *device;
	acpi_status status;

	int i = 0;
	int j = 0;


	if (!tz)
		goto end;

	if (tz->trips.critical.flags.valid)
		seq_printf(seq, "critical (S5):           %ld C%s",
			   KELVIN_TO_CELSIUS(tz->trips.critical.temperature),
			   nocrt ? " <disabled>\n" : "\n");

	if (tz->trips.hot.flags.valid)
		seq_printf(seq, "hot (S4):                %ld C%s",
			   KELVIN_TO_CELSIUS(tz->trips.hot.temperature),
			   nocrt ? " <disabled>\n" : "\n");

	if (tz->trips.passive.flags.valid) {
		seq_printf(seq,
			   "passive:                 %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
			   KELVIN_TO_CELSIUS(tz->trips.passive.temperature),
			   tz->trips.passive.tc1, tz->trips.passive.tc2,
			   tz->trips.passive.tsp);
		for (j = 0; j < tz->trips.passive.devices.count; j++) {
			status = acpi_bus_get_device(tz->trips.passive.devices.
						     handles[j], &device);
			seq_printf(seq, "%4.4s ", status ? "" :
				   acpi_device_bid(device));
		}
		seq_puts(seq, "\n");
	}

	for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
		if (!(tz->trips.active[i].flags.valid))
			break;
		seq_printf(seq, "active[%d]:               %ld C: devices=",
			   i,
			   KELVIN_TO_CELSIUS(tz->trips.active[i].temperature));
		for (j = 0; j < tz->trips.active[i].devices.count; j++){
			status = acpi_bus_get_device(tz->trips.active[i].
						     devices.handles[j],
						     &device);
			seq_printf(seq, "%4.4s ", status ? "" :
				   acpi_device_bid(device));
		}
		seq_puts(seq, "\n");
	}

      end:
	return 0;
}

static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file)
{
	return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data);
}

static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset)
{
	struct acpi_thermal *tz = seq->private;


	if (!tz)
		goto end;

	if (!tz->flags.cooling_mode)
		seq_puts(seq, "<setting not supported>\n");
	else
		seq_puts(seq, "0 - Active; 1 - Passive\n");

      end:
	return 0;
}

static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file)
{
	return single_open(file, acpi_thermal_cooling_seq_show,
			   PDE(inode)->data);
}

static ssize_t
acpi_thermal_write_cooling_mode(struct file *file,
				const char __user * buffer,
				size_t count, loff_t * ppos)
{
	struct seq_file *m = file->private_data;
	struct acpi_thermal *tz = m->private;
	int result = 0;
	char mode_string[12] = { '\0' };


	if (!tz || (count > sizeof(mode_string) - 1))