Release 4.11 drivers/acpi/processor_driver.c

/*
 * processor_driver.c - 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
 *  Copyright (C) 2013, Intel Corporation
 *                      Rafael J. Wysocki <rafael.j.wysocki@intel.com>
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 *  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/cpu.h>
#include <linux/cpuidle.h>
#include <linux/slab.h>
#include <linux/acpi.h>

#include <acpi/processor.h>

#include "internal.h"


#define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80

#define ACPI_PROCESSOR_NOTIFY_POWER	0x81

#define ACPI_PROCESSOR_NOTIFY_THROTTLING	0x82


#define _COMPONENT		ACPI_PROCESSOR_COMPONENT
ACPI_MODULE_NAME("processor_driver");

MODULE_AUTHOR("Paul Diefenbaugh");
MODULE_DESCRIPTION("ACPI Processor Driver");
MODULE_LICENSE("GPL");

static int acpi_processor_start(struct device *dev);
static int acpi_processor_stop(struct device *dev);


static const struct acpi_device_id processor_device_ids[] = {
	{ACPI_PROCESSOR_OBJECT_HID, 0},
	{ACPI_PROCESSOR_DEVICE_HID, 0},
	{"", 0},
};
MODULE_DEVICE_TABLE(acpi, processor_device_ids);


static struct device_driver acpi_processor_driver = {
	.name = "processor",
	.bus = &cpu_subsys,
	.acpi_match_table = processor_device_ids,
	.probe = acpi_processor_start,
	.remove = acpi_processor_stop,
};



static void acpi_processor_notify(acpi_handle handle, u32 event, void *data)
{
	struct acpi_device *device = data;
	struct acpi_processor *pr;
	int saved;

	if (device->handle != handle)
		return;

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

	switch (event) {
	case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
		saved = pr->performance_platform_limit;
		acpi_processor_ppc_has_changed(pr, 1);
		if (saved == pr->performance_platform_limit)
			break;
		acpi_bus_generate_netlink_event(device->pnp.device_class,
						  dev_name(&device->dev), event,
						  pr->performance_platform_limit);
		break;
	case ACPI_PROCESSOR_NOTIFY_POWER:
		acpi_processor_power_state_has_changed(pr);
		acpi_bus_generate_netlink_event(device->pnp.device_class,
						  dev_name(&device->dev), event, 0);
		break;
	case ACPI_PROCESSOR_NOTIFY_THROTTLING:
		acpi_processor_tstate_has_changed(pr);
		acpi_bus_generate_netlink_event(device->pnp.device_class,
						  dev_name(&device->dev), event, 0);
		break;
	default:
		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
				  "Unsupported event [0x%x]\n", event));
		break;
	}

	return;
}

Contributors
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Rafael J. Wysocki
120
65.93%
3
25.00%
Len Brown
29
15.93%
2
16.67%
Andy Grover
23
12.64%
3
25.00%
Toshi Kani
9
4.95%
3
25.00%
Sudeep Holla
1
0.55%
1
8.33%
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182
100.00%
12
100.00%

static int __acpi_processor_start(struct acpi_device *device);



static int acpi_soft_cpu_online(unsigned int cpu)
{
	struct acpi_processor *pr = per_cpu(processors, cpu);
	struct acpi_device *device;

	if (!pr || acpi_bus_get_device(pr->handle, &device))
		return 0;
	/*
         * CPU got physically hotplugged and onlined for the first time:
         * Initialize missing things.
         */
	if (pr->flags.need_hotplug_init) {
		int ret;

		pr_info("Will online and init hotplugged CPU: %d\n",
			pr->id);
		pr->flags.need_hotplug_init = 0;
		ret = __acpi_processor_start(device);
		WARN(ret, "Failed to start CPU: %d\n", pr->id);
	} else {
		/* Normal CPU soft online event. */
		acpi_processor_ppc_has_changed(pr, 0);
		acpi_processor_hotplug(pr);
		acpi_processor_reevaluate_tstate(pr, false);
		acpi_processor_tstate_has_changed(pr);
	}
	return 0;
}

Contributors
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Rafael J. Wysocki
75
60.00%
1
25.00%
Toshi Kani
36
28.80%
1
25.00%
Sebastian Andrzej Siewior
9
7.20%
1
25.00%
Len Brown
5
4.00%
1
25.00%
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125
100.00%
4
100.00%



static int acpi_soft_cpu_dead(unsigned int cpu)
{
	struct acpi_processor *pr = per_cpu(processors, cpu);
	struct acpi_device *device;

	if (!pr || acpi_bus_get_device(pr->handle, &device))
		return 0;

	acpi_processor_reevaluate_tstate(pr, true);
	return 0;
}

Contributors
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Sebastian Andrzej Siewior
43
78.18%
1
33.33%
Len Brown
9
16.36%
1
33.33%
Rafael J. Wysocki
3
5.45%
1
33.33%
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55
100.00%
3
100.00%

#ifdef CONFIG_ACPI_CPU_FREQ_PSS


static int acpi_pss_perf_init(struct acpi_processor *pr,
		struct acpi_device *device)
{
	int result = 0;

	acpi_processor_ppc_has_changed(pr, 0);

	acpi_processor_get_throttling_info(pr);

	if (pr->flags.throttling)
		pr->flags.limit = 1;

	pr->cdev = thermal_cooling_device_register("Processor", device,
						   &processor_cooling_ops);
	if (IS_ERR(pr->cdev)) {
		result = PTR_ERR(pr->cdev);
		return result;
	}

	dev_dbg(&device->dev, "registered as cooling_device%d\n",
		pr->cdev->id);

	result = sysfs_create_link(&device->dev.kobj,
				   &pr->cdev->device.kobj,
				   "thermal_cooling");
	if (result) {
		dev_err(&device->dev,
			"Failed to create sysfs link 'thermal_cooling'\n");
		goto err_thermal_unregister;
	}

	result = sysfs_create_link(&pr->cdev->device.kobj,
				   &device->dev.kobj,
				   "device");
	if (result) {
		dev_err(&pr->cdev->device,
			"Failed to create sysfs link 'device'\n");
		goto err_remove_sysfs_thermal;
	}

	return 0;

 err_remove_sysfs_thermal:
	sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
 err_thermal_unregister:
	thermal_cooling_device_unregister(pr->cdev);

	return result;
}

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Rafael J. Wysocki
129
59.45%
1
8.33%
Thomas Renninger
19
8.76%
2
16.67%
Len Brown
19
8.76%
2
16.67%
Lan Tianyu
14
6.45%
1
8.33%
Ashwin Chaugule
13
5.99%
1
8.33%
Andy Grover
11
5.07%
2
16.67%
Rui Zhang
5
2.30%
1
8.33%
Yasuaki Ishimatsu
4
1.84%
1
8.33%
Srinivas Pandruvada
3
1.38%
1
8.33%
Total
217
100.00%
12
100.00%



static void acpi_pss_perf_exit(struct acpi_processor *pr,
		struct acpi_device *device)
{
	if (pr->cdev) {
		sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
		sysfs_remove_link(&pr->cdev->device.kobj, "device");
		thermal_cooling_device_unregister(pr->cdev);
		pr->cdev = NULL;
	}
}
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#else


static inline int acpi_pss_perf_init(struct acpi_processor *pr,
		struct acpi_device *device)
{
	return 0;
}

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static inline void acpi_pss_perf_exit(struct acpi_processor *pr,
		struct acpi_device *device) {}
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#endif /* CONFIG_ACPI_CPU_FREQ_PSS */



static int __acpi_processor_start(struct acpi_device *device)
{
	struct acpi_processor *pr = acpi_driver_data(device);
	acpi_status status;
	int result = 0;

	if (!pr)
		return -ENODEV;

	if (pr->flags.need_hotplug_init)
		return 0;

	result = acpi_cppc_processor_probe(pr);
	if (result && !IS_ENABLED(CONFIG_ACPI_CPU_FREQ_PSS))
		dev_warn(&device->dev, "CPPC data invalid or not present\n");

	if (!cpuidle_get_driver() || cpuidle_get_driver() == &acpi_idle_driver)
		acpi_processor_power_init(pr);

	result = acpi_pss_perf_init(pr, device);
	if (result)
		goto err_power_exit;

	status = acpi_install_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
					     acpi_processor_notify, device);
	if (ACPI_SUCCESS(status))
		return 0;

err_power_exit:
	acpi_processor_power_exit(pr);
	return result;
}

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Srinivas Pandruvada
16
11.11%
2
28.57%
Len Brown
7
4.86%
2
28.57%
Rafael J. Wysocki
4
2.78%
1
14.29%
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100.00%



static int acpi_processor_start(struct device *dev)
{
	struct acpi_device *device = ACPI_COMPANION(dev);

	if (!device)
		return -ENODEV;

	return __acpi_processor_start(device);
}

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Rafael J. Wysocki
18
50.00%
1
20.00%
Len Brown
11
30.56%
2
40.00%
Lan Tianyu
6
16.67%
1
20.00%
Thomas Renninger
1
2.78%
1
20.00%
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36
100.00%
5
100.00%



static int acpi_processor_stop(struct device *dev)
{
	struct acpi_device *device = ACPI_COMPANION(dev);
	struct acpi_processor *pr;

	if (!device)
		return 0;

	acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
				   acpi_processor_notify);

	pr = acpi_driver_data(device);
	if (!pr)
		return 0;
	acpi_processor_power_exit(pr);

	acpi_pss_perf_exit(pr, device);

	acpi_cppc_processor_exit(pr);

	return 0;
}

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Rafael J. Wysocki
54
67.50%
1
14.29%
Len Brown
9
11.25%
2
28.57%
Ashwin Chaugule
7
8.75%
2
28.57%
Lan Tianyu
6
7.50%
1
14.29%
Venkatesh Pallipadi
4
5.00%
1
14.29%
Total
80
100.00%
7
100.00%

/*
 * We keep the driver loaded even when ACPI is not running.
 * This is needed for the powernow-k8 driver, that works even without
 * ACPI, but needs symbols from this driver
 */

static enum cpuhp_state hp_online;


static int __init acpi_processor_driver_init(void)
{
	int result = 0;

	if (acpi_disabled)
		return 0;

	result = driver_register(&acpi_processor_driver);
	if (result < 0)
		return result;

	result = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN,
					   "acpi/cpu-drv:online",
					   acpi_soft_cpu_online, NULL);
	if (result < 0)
		goto err;
	hp_online = result;
	cpuhp_setup_state_nocalls(CPUHP_ACPI_CPUDRV_DEAD, "acpi/cpu-drv:dead",
				  NULL, acpi_soft_cpu_dead);

	acpi_thermal_cpufreq_init();
	acpi_processor_ppc_init();
	acpi_processor_throttling_init();
	return 0;
err:
	driver_unregister(&acpi_processor_driver);
	return result;
}

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7.69%
Andy Grover
17
17.35%
2
15.38%
Len Brown
10
10.20%
2
15.38%
Yinghai Lu
7
7.14%
1
7.69%
Dominik Brodowski
6
6.12%
2
15.38%
Rafael J. Wysocki
4
4.08%
1
7.69%
Deepthi Dharwar
3
3.06%
1
7.69%
Yakui Zhao
3
3.06%
1
7.69%
Patrick Mochel
2
2.04%
1
7.69%
Akinobu Mita
1
1.02%
1
7.69%
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98
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13
100.00%



static void __exit acpi_processor_driver_exit(void)
{
	if (acpi_disabled)
		return;

	acpi_processor_ppc_exit();
	acpi_thermal_cpufreq_exit();
	cpuhp_remove_state_nocalls(hp_online);
	cpuhp_remove_state_nocalls(CPUHP_ACPI_CPUDRV_DEAD);
	driver_unregister(&acpi_processor_driver);
}

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Sebastian Andrzej Siewior
7
19.44%
1
14.29%
Dominik Brodowski
6
16.67%
2
28.57%
Yinghai Lu
5
13.89%
1
14.29%
Rafael J. Wysocki
4
11.11%
1
14.29%
Len Brown
1
2.78%
1
14.29%
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36
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7
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module_init(acpi_processor_driver_init);

module_exit(acpi_processor_driver_exit);

MODULE_ALIAS("processor");
Overall Contributors
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Rafael J. Wysocki
438
34.62%
3
5.66%
Ashwin Chaugule
244
19.29%
2
3.77%
Andy Grover
136
10.75%
8
15.09%
Len Brown
117
9.25%
9
16.98%
Sebastian Andrzej Siewior
109
8.62%
1
1.89%
Thomas Renninger
55
4.35%
3
5.66%
Toshi Kani
49
3.87%
4
7.55%
Lan Tianyu
26
2.06%
2
3.77%
Srinivas Pandruvada
19
1.50%
3
5.66%
Dominik Brodowski
12
0.95%
2
3.77%
Yinghai Lu
12
0.95%
1
1.89%
Patrick Mochel
10
0.79%
2
3.77%
Myron Stowe
6
0.47%
1
1.89%
Rui Zhang
5
0.40%
1
1.89%
Yasuaki Ishimatsu
4
0.32%
1
1.89%
Yu Luming
4
0.32%
1
1.89%
Venkatesh Pallipadi
4
0.32%
1
1.89%
Tejun Heo
3
0.24%
1
1.89%
Deepthi Dharwar
3
0.24%
1
1.89%
Yakui Zhao
3
0.24%
1
1.89%
Björn Helgaas
2
0.16%
1
1.89%
Alexander Chiang
1
0.08%
1
1.89%
Akinobu Mita
1
0.08%
1
1.89%
Sudeep Holla
1
0.08%
1
1.89%
Jarkko Nikula
1
0.08%
1
1.89%
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1265
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53
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Directory: drivers/acpi

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