Release 4.10 drivers/acpi/processor_thermal.c

/*
 * processor_thermal.c - Passive cooling submodule of the ACPI processor driver
 *
 *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
 *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
 *  Copyright (C) 2004       Dominik Brodowski <linux@brodo.de>
 *  Copyright (C) 2004  Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
 *                      - Added processor hotplug support
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or (at
 *  your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful, but
 *  WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  General Public License for more details.
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/cpufreq.h>
#include <linux/acpi.h>
#include <acpi/processor.h>
#include <linux/uaccess.h>


#define PREFIX "ACPI: "


#define ACPI_PROCESSOR_CLASS            "processor"

#define _COMPONENT              ACPI_PROCESSOR_COMPONENT
ACPI_MODULE_NAME("processor_thermal");

#ifdef CONFIG_CPU_FREQ

/* If a passive cooling situation is detected, primarily CPUfreq is used, as it
 * offers (in most cases) voltage scaling in addition to frequency scaling, and
 * thus a cubic (instead of linear) reduction of energy. Also, we allow for
 * _any_ cpufreq driver and not only the acpi-cpufreq driver.
 */


#define CPUFREQ_THERMAL_MIN_STEP 0

#define CPUFREQ_THERMAL_MAX_STEP 3

static DEFINE_PER_CPU(unsigned int, cpufreq_thermal_reduction_pctg);

static unsigned int acpi_thermal_cpufreq_is_init = 0;


#define reduction_pctg(cpu) \
	per_cpu(cpufreq_thermal_reduction_pctg, phys_package_first_cpu(cpu))

/*
 * Emulate "per package data" using per cpu data (which should really be
 * provided elsewhere)
 *
 * Note we can lose a CPU on cpu hotunplug, in this case we forget the state
 * temporarily. Fortunately that's not a big issue here (I hope)
 */


static int phys_package_first_cpu(int cpu)
{
	int i;
	int id = topology_physical_package_id(cpu);

	for_each_online_cpu(i)
		if (topology_physical_package_id(i) == id)
			return i;
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
andi kleen
andi kleen
39
100.00%
1
100.00%
Total
39
100.00%
1
100.00%



static int cpu_has_cpufreq(unsigned int cpu)
{
	struct cpufreq_policy policy;
	if (!acpi_thermal_cpufreq_is_init || cpufreq_get_policy(&policy, cpu))
		return 0;
	return 1;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
len brown
len brown
30
90.91%
1
33.33%
thomas renninger
thomas renninger
3
9.09%
2
66.67%
Total
33
100.00%
3
100.00%



static int acpi_thermal_cpufreq_notifier(struct notifier_block *nb,
					 unsigned long event, void *data)
{
	struct cpufreq_policy *policy = data;
	unsigned long max_freq = 0;

	if (event != CPUFREQ_ADJUST)
		goto out;

	max_freq = (
	    policy->cpuinfo.max_freq *
	    (100 - reduction_pctg(policy->cpu) * 20)
	) / 100;

	cpufreq_verify_within_limits(policy, 0, max_freq);

      out:
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
len brown
len brown
75
93.75%
1
25.00%
mike travis
mike travis
2
2.50%
1
25.00%
rui zhang
rui zhang
2
2.50%
1
25.00%
andi kleen
andi kleen
1
1.25%
1
25.00%
Total
80
100.00%
4
100.00%


static struct notifier_block acpi_thermal_cpufreq_notifier_block = {
	.notifier_call = acpi_thermal_cpufreq_notifier,
};



static int cpufreq_get_max_state(unsigned int cpu)
{
	if (!cpu_has_cpufreq(cpu))
		return 0;

	return CPUFREQ_THERMAL_MAX_STEP;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
rui zhang
rui zhang
24
100.00%
1
100.00%
Total
24
100.00%
1
100.00%



static int cpufreq_get_cur_state(unsigned int cpu)
{
	if (!cpu_has_cpufreq(cpu))
		return 0;

	return reduction_pctg(cpu);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
rui zhang
rui zhang
24
88.89%
1
33.33%
mike travis
mike travis
2
7.41%
1
33.33%
andi kleen
andi kleen
1
3.70%
1
33.33%
Total
27
100.00%
3
100.00%



static int cpufreq_set_cur_state(unsigned int cpu, int state)
{
	int i;

	if (!cpu_has_cpufreq(cpu))
		return 0;

	reduction_pctg(cpu) = state;

	/*
         * Update all the CPUs in the same package because they all
         * contribute to the temperature and often share the same
         * frequency.
         */
	for_each_online_cpu(i) {
		if (topology_physical_package_id(i) ==
		    topology_physical_package_id(cpu))
			cpufreq_update_policy(i);
	}
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
rui zhang
rui zhang
35
57.38%
1
33.33%
andi kleen
andi kleen
24
39.34%
1
33.33%
mike travis
mike travis
2
3.28%
1
33.33%
Total
61
100.00%
3
100.00%



void acpi_thermal_cpufreq_init(void)
{
	int i;

	i = cpufreq_register_notifier(&acpi_thermal_cpufreq_notifier_block,
				      CPUFREQ_POLICY_NOTIFIER);
	if (!i)
		acpi_thermal_cpufreq_is_init = 1;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
len brown
len brown
29
100.00%
1
100.00%
Total
29
100.00%
1
100.00%



void acpi_thermal_cpufreq_exit(void)
{
	if (acpi_thermal_cpufreq_is_init)
		cpufreq_unregister_notifier
		    (&acpi_thermal_cpufreq_notifier_block,
		     CPUFREQ_POLICY_NOTIFIER);

	acpi_thermal_cpufreq_is_init = 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
len brown
len brown
23
100.00%
1
100.00%
Total
23
100.00%
1
100.00%

#else				/* ! CONFIG_CPU_FREQ */


static int cpufreq_get_max_state(unsigned int cpu)
{
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
rui zhang
rui zhang
13
100.00%
1
100.00%
Total
13
100.00%
1
100.00%



static int cpufreq_get_cur_state(unsigned int cpu)
{
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
rui zhang
rui zhang
13
100.00%
1
100.00%
Total
13
100.00%
1
100.00%



static int cpufreq_set_cur_state(unsigned int cpu, int state)
{
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
rui zhang
rui zhang
16
100.00%
1
100.00%
Total
16
100.00%
1
100.00%

#endif

/* thermal cooling device callbacks */


static int acpi_processor_max_state(struct acpi_processor *pr)
{
	int max_state = 0;

	/*
         * There exists four states according to
         * cpufreq_thermal_reduction_pctg. 0, 1, 2, 3
         */
	max_state += cpufreq_get_max_state(pr->id);
	if (pr->flags.throttling)
		max_state += (pr->throttling.state_count -1);

	return max_state;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
rui zhang
rui zhang
48
97.96%
1
50.00%
al stone
al stone
1
2.04%
1
50.00%
Total
49
100.00%
2
100.00%


static int

processor_get_max_state(struct thermal_cooling_device *cdev,
			unsigned long *state)
{
	struct acpi_device *device = cdev->devdata;
	struct acpi_processor *pr;

	if (!device)
		return -EINVAL;

	pr = acpi_driver_data(device);
	if (!pr)
		return -EINVAL;

	*state = acpi_processor_max_state(pr);
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
rui zhang
rui zhang
44
66.67%
1
33.33%
colin king
colin king
13
19.70%
1
33.33%
matthew garrett
matthew garrett
9
13.64%
1
33.33%
Total
66
100.00%
3
100.00%


static int

processor_get_cur_state(struct thermal_cooling_device *cdev,
			unsigned long *cur_state)
{
	struct acpi_device *device = cdev->devdata;
	struct acpi_processor *pr;

	if (!device)
		return -EINVAL;

	pr = acpi_driver_data(device);
	if (!pr)
		return -EINVAL;

	*cur_state = cpufreq_get_cur_state(pr->id);
	if (pr->flags.throttling)
		*cur_state += pr->throttling.state;
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
rui zhang
rui zhang
66
77.65%
1
33.33%
colin king
colin king
13
15.29%
1
33.33%
matthew garrett
matthew garrett
6
7.06%
1
33.33%
Total
85
100.00%
3
100.00%


static int

processor_set_cur_state(struct thermal_cooling_device *cdev,
			unsigned long state)
{
	struct acpi_device *device = cdev->devdata;
	struct acpi_processor *pr;
	int result = 0;
	int max_pstate;

	if (!device)
		return -EINVAL;

	pr = acpi_driver_data(device);
	if (!pr)
		return -EINVAL;

	max_pstate = cpufreq_get_max_state(pr->id);

	if (state > acpi_processor_max_state(pr))
		return -EINVAL;

	if (state <= max_pstate) {
		if (pr->flags.throttling && pr->throttling.state)
			result = acpi_processor_set_throttling(pr, 0, false);
		cpufreq_set_cur_state(pr->id, state);
	} else {
		cpufreq_set_cur_state(pr->id, max_pstate);
		result = acpi_processor_set_throttling(pr,
				state - max_pstate, false);
	}
	return result;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
rui zhang
rui zhang
135
87.66%
1
25.00%
colin king
colin king
14
9.09%
1
25.00%
frans pop
frans pop
4
2.60%
1
25.00%
matthew garrett
matthew garrett
1
0.65%
1
25.00%
Total
154
100.00%
4
100.00%


const struct thermal_cooling_device_ops processor_cooling_ops = {
	.get_max_state = processor_get_max_state,
	.get_cur_state = processor_get_cur_state,
	.set_cur_state = processor_set_cur_state,
};
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
rui zhang
rui zhang
449
54.29%
1
6.25%
len brown
len brown
222
26.84%
3
18.75%
andi kleen
andi kleen
74
8.95%
1
6.25%
colin king
colin king
40
4.84%
1
6.25%
matthew garrett
matthew garrett
16
1.93%
1
6.25%
mike travis
mike travis
13
1.57%
1
6.25%
frans pop
frans pop
4
0.48%
1
6.25%
thomas renninger
thomas renninger
3
0.36%
2
12.50%
al stone
al stone
2
0.24%
1
6.25%
jarkko nikula
jarkko nikula
1
0.12%
1
6.25%
linus torvalds
linus torvalds
1
0.12%
1
6.25%
lv zheng
lv zheng
1
0.12%
1
6.25%
vasiliy kulikov
vasiliy kulikov
1
0.12%
1
6.25%
Total
827
100.00%
16
100.00%
Directory: drivers/acpi

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.