// SPDX-License-Identifier: GPL-2.0-or-later/* * 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> */ #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 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_handle_debug(handle, "Unsupported event [0x%x]\n", event);		break;	} 	return;} 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;} 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;} #ifdef CONFIG_ACPI_CPU_FREQ_PSSstatic 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;} 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;	}}#elsestatic inline int acpi_pss_perf_init(struct acpi_processor *pr,		struct acpi_device *device){	return 0;} static inline void acpi_pss_perf_exit(struct acpi_processor *pr,		struct acpi_device *device) {}#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_dbg(&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; 	result = -ENODEV;	acpi_pss_perf_exit(pr, device); err_power_exit:	acpi_processor_power_exit(pr);	return result;} static int acpi_processor_start(struct device *dev){	struct acpi_device *device = ACPI_COMPANION(dev);	int ret; 	if (!device)		return -ENODEV; 	/* Protect against concurrent CPU hotplug operations */	cpu_hotplug_disable();	ret = __acpi_processor_start(device);	cpu_hotplug_enable();	return ret;} 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;} bool acpi_processor_cpufreq_init; static int acpi_processor_notifier(struct notifier_block *nb,				   unsigned long event, void *data){	struct cpufreq_policy *policy = data; 	if (event == CPUFREQ_CREATE_POLICY) {		acpi_thermal_cpufreq_init(policy);		acpi_processor_ppc_init(policy);	} else if (event == CPUFREQ_REMOVE_POLICY) {		acpi_processor_ppc_exit(policy);		acpi_thermal_cpufreq_exit(policy);	} 	return 0;} static struct notifier_block acpi_processor_notifier_block = {	.notifier_call = acpi_processor_notifier,}; /* * 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); 	if (!cpufreq_register_notifier(&acpi_processor_notifier_block,				       CPUFREQ_POLICY_NOTIFIER)) {		acpi_processor_cpufreq_init = true;		acpi_processor_ignore_ppc_init();	} 	acpi_processor_throttling_init();	return 0;err:	driver_unregister(&acpi_processor_driver);	return result;} static void __exit acpi_processor_driver_exit(void){	if (acpi_disabled)		return; 	if (acpi_processor_cpufreq_init) {		cpufreq_unregister_notifier(&acpi_processor_notifier_block,					    CPUFREQ_POLICY_NOTIFIER);		acpi_processor_cpufreq_init = false;	} 	cpuhp_remove_state_nocalls(hp_online);	cpuhp_remove_state_nocalls(CPUHP_ACPI_CPUDRV_DEAD);	driver_unregister(&acpi_processor_driver);} module_init(acpi_processor_driver_init);module_exit(acpi_processor_driver_exit); MODULE_ALIAS("processor");