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367 lines
8.9 KiB
367 lines
8.9 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* processor_driver.c - ACPI Processor Driver |
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* |
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* Copyright (C) 2001, 2002 Andy Grover <[email protected]> |
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* Copyright (C) 2001, 2002 Paul Diefenbaugh <[email protected]> |
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* Copyright (C) 2004 Dominik Brodowski <[email protected]> |
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* Copyright (C) 2004 Anil S Keshavamurthy <[email protected]> |
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* - Added processor hotplug support |
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* Copyright (C) 2013, Intel Corporation |
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* Rafael J. Wysocki <[email protected]> |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/init.h> |
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#include <linux/cpufreq.h> |
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#include <linux/cpu.h> |
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#include <linux/cpuidle.h> |
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#include <linux/slab.h> |
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#include <linux/acpi.h> |
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#include <acpi/processor.h> |
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#include "internal.h" |
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#define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80 |
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#define ACPI_PROCESSOR_NOTIFY_POWER 0x81 |
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#define ACPI_PROCESSOR_NOTIFY_THROTTLING 0x82 |
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#define _COMPONENT ACPI_PROCESSOR_COMPONENT |
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ACPI_MODULE_NAME("processor_driver"); |
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MODULE_AUTHOR("Paul Diefenbaugh"); |
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MODULE_DESCRIPTION("ACPI Processor Driver"); |
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MODULE_LICENSE("GPL"); |
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static int acpi_processor_start(struct device *dev); |
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static int acpi_processor_stop(struct device *dev); |
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static const struct acpi_device_id processor_device_ids[] = { |
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{ACPI_PROCESSOR_OBJECT_HID, 0}, |
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{ACPI_PROCESSOR_DEVICE_HID, 0}, |
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{"", 0}, |
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}; |
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MODULE_DEVICE_TABLE(acpi, processor_device_ids); |
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static struct device_driver acpi_processor_driver = { |
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.name = "processor", |
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.bus = &cpu_subsys, |
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.acpi_match_table = processor_device_ids, |
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.probe = acpi_processor_start, |
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.remove = acpi_processor_stop, |
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}; |
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static void acpi_processor_notify(acpi_handle handle, u32 event, void *data) |
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{ |
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struct acpi_device *device = data; |
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struct acpi_processor *pr; |
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int saved; |
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if (device->handle != handle) |
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return; |
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pr = acpi_driver_data(device); |
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if (!pr) |
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return; |
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switch (event) { |
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case ACPI_PROCESSOR_NOTIFY_PERFORMANCE: |
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saved = pr->performance_platform_limit; |
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acpi_processor_ppc_has_changed(pr, 1); |
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if (saved == pr->performance_platform_limit) |
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break; |
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acpi_bus_generate_netlink_event(device->pnp.device_class, |
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dev_name(&device->dev), event, |
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pr->performance_platform_limit); |
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break; |
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case ACPI_PROCESSOR_NOTIFY_POWER: |
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acpi_processor_power_state_has_changed(pr); |
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acpi_bus_generate_netlink_event(device->pnp.device_class, |
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dev_name(&device->dev), event, 0); |
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break; |
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case ACPI_PROCESSOR_NOTIFY_THROTTLING: |
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acpi_processor_tstate_has_changed(pr); |
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acpi_bus_generate_netlink_event(device->pnp.device_class, |
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dev_name(&device->dev), event, 0); |
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break; |
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default: |
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
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"Unsupported event [0x%x]\n", event)); |
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break; |
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} |
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return; |
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} |
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static int __acpi_processor_start(struct acpi_device *device); |
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static int acpi_soft_cpu_online(unsigned int cpu) |
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{ |
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struct acpi_processor *pr = per_cpu(processors, cpu); |
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struct acpi_device *device; |
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if (!pr || acpi_bus_get_device(pr->handle, &device)) |
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return 0; |
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/* |
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* CPU got physically hotplugged and onlined for the first time: |
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* Initialize missing things. |
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*/ |
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if (pr->flags.need_hotplug_init) { |
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int ret; |
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pr_info("Will online and init hotplugged CPU: %d\n", |
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pr->id); |
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pr->flags.need_hotplug_init = 0; |
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ret = __acpi_processor_start(device); |
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WARN(ret, "Failed to start CPU: %d\n", pr->id); |
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} else { |
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/* Normal CPU soft online event. */ |
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acpi_processor_ppc_has_changed(pr, 0); |
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acpi_processor_hotplug(pr); |
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acpi_processor_reevaluate_tstate(pr, false); |
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acpi_processor_tstate_has_changed(pr); |
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} |
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return 0; |
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} |
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static int acpi_soft_cpu_dead(unsigned int cpu) |
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{ |
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struct acpi_processor *pr = per_cpu(processors, cpu); |
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struct acpi_device *device; |
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if (!pr || acpi_bus_get_device(pr->handle, &device)) |
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return 0; |
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acpi_processor_reevaluate_tstate(pr, true); |
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return 0; |
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} |
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#ifdef CONFIG_ACPI_CPU_FREQ_PSS |
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static int acpi_pss_perf_init(struct acpi_processor *pr, |
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struct acpi_device *device) |
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{ |
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int result = 0; |
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acpi_processor_ppc_has_changed(pr, 0); |
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acpi_processor_get_throttling_info(pr); |
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if (pr->flags.throttling) |
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pr->flags.limit = 1; |
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pr->cdev = thermal_cooling_device_register("Processor", device, |
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&processor_cooling_ops); |
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if (IS_ERR(pr->cdev)) { |
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result = PTR_ERR(pr->cdev); |
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return result; |
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} |
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dev_dbg(&device->dev, "registered as cooling_device%d\n", |
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pr->cdev->id); |
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result = sysfs_create_link(&device->dev.kobj, |
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&pr->cdev->device.kobj, |
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"thermal_cooling"); |
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if (result) { |
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dev_err(&device->dev, |
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"Failed to create sysfs link 'thermal_cooling'\n"); |
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goto err_thermal_unregister; |
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} |
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result = sysfs_create_link(&pr->cdev->device.kobj, |
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&device->dev.kobj, |
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"device"); |
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if (result) { |
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dev_err(&pr->cdev->device, |
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"Failed to create sysfs link 'device'\n"); |
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goto err_remove_sysfs_thermal; |
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} |
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return 0; |
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err_remove_sysfs_thermal: |
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sysfs_remove_link(&device->dev.kobj, "thermal_cooling"); |
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err_thermal_unregister: |
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thermal_cooling_device_unregister(pr->cdev); |
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return result; |
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} |
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static void acpi_pss_perf_exit(struct acpi_processor *pr, |
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struct acpi_device *device) |
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{ |
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if (pr->cdev) { |
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sysfs_remove_link(&device->dev.kobj, "thermal_cooling"); |
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sysfs_remove_link(&pr->cdev->device.kobj, "device"); |
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thermal_cooling_device_unregister(pr->cdev); |
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pr->cdev = NULL; |
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} |
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} |
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#else |
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static inline int acpi_pss_perf_init(struct acpi_processor *pr, |
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struct acpi_device *device) |
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{ |
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return 0; |
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} |
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static inline void acpi_pss_perf_exit(struct acpi_processor *pr, |
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struct acpi_device *device) {} |
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#endif /* CONFIG_ACPI_CPU_FREQ_PSS */ |
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static int __acpi_processor_start(struct acpi_device *device) |
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{ |
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struct acpi_processor *pr = acpi_driver_data(device); |
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acpi_status status; |
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int result = 0; |
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if (!pr) |
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return -ENODEV; |
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if (pr->flags.need_hotplug_init) |
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return 0; |
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result = acpi_cppc_processor_probe(pr); |
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if (result && !IS_ENABLED(CONFIG_ACPI_CPU_FREQ_PSS)) |
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dev_dbg(&device->dev, "CPPC data invalid or not present\n"); |
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if (!cpuidle_get_driver() || cpuidle_get_driver() == &acpi_idle_driver) |
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acpi_processor_power_init(pr); |
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result = acpi_pss_perf_init(pr, device); |
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if (result) |
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goto err_power_exit; |
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status = acpi_install_notify_handler(device->handle, ACPI_DEVICE_NOTIFY, |
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acpi_processor_notify, device); |
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if (ACPI_SUCCESS(status)) |
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return 0; |
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result = -ENODEV; |
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acpi_pss_perf_exit(pr, device); |
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err_power_exit: |
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acpi_processor_power_exit(pr); |
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return result; |
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} |
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static int acpi_processor_start(struct device *dev) |
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{ |
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struct acpi_device *device = ACPI_COMPANION(dev); |
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int ret; |
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if (!device) |
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return -ENODEV; |
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/* Protect against concurrent CPU hotplug operations */ |
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cpu_hotplug_disable(); |
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ret = __acpi_processor_start(device); |
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cpu_hotplug_enable(); |
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return ret; |
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} |
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static int acpi_processor_stop(struct device *dev) |
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{ |
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struct acpi_device *device = ACPI_COMPANION(dev); |
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struct acpi_processor *pr; |
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if (!device) |
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return 0; |
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acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY, |
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acpi_processor_notify); |
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pr = acpi_driver_data(device); |
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if (!pr) |
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return 0; |
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acpi_processor_power_exit(pr); |
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acpi_pss_perf_exit(pr, device); |
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acpi_cppc_processor_exit(pr); |
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return 0; |
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} |
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bool acpi_processor_cpufreq_init; |
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static int acpi_processor_notifier(struct notifier_block *nb, |
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unsigned long event, void *data) |
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{ |
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struct cpufreq_policy *policy = data; |
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if (event == CPUFREQ_CREATE_POLICY) { |
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acpi_thermal_cpufreq_init(policy); |
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acpi_processor_ppc_init(policy); |
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} else if (event == CPUFREQ_REMOVE_POLICY) { |
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acpi_processor_ppc_exit(policy); |
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acpi_thermal_cpufreq_exit(policy); |
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} |
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return 0; |
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} |
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static struct notifier_block acpi_processor_notifier_block = { |
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.notifier_call = acpi_processor_notifier, |
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}; |
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/* |
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* We keep the driver loaded even when ACPI is not running. |
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* This is needed for the powernow-k8 driver, that works even without |
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* ACPI, but needs symbols from this driver |
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*/ |
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static enum cpuhp_state hp_online; |
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static int __init acpi_processor_driver_init(void) |
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{ |
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int result = 0; |
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if (acpi_disabled) |
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return 0; |
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result = driver_register(&acpi_processor_driver); |
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if (result < 0) |
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return result; |
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result = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN, |
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"acpi/cpu-drv:online", |
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acpi_soft_cpu_online, NULL); |
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if (result < 0) |
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goto err; |
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hp_online = result; |
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cpuhp_setup_state_nocalls(CPUHP_ACPI_CPUDRV_DEAD, "acpi/cpu-drv:dead", |
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NULL, acpi_soft_cpu_dead); |
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if (!cpufreq_register_notifier(&acpi_processor_notifier_block, |
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CPUFREQ_POLICY_NOTIFIER)) { |
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acpi_processor_cpufreq_init = true; |
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acpi_processor_ignore_ppc_init(); |
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} |
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acpi_processor_throttling_init(); |
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return 0; |
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err: |
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driver_unregister(&acpi_processor_driver); |
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return result; |
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} |
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static void __exit acpi_processor_driver_exit(void) |
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{ |
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if (acpi_disabled) |
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return; |
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if (acpi_processor_cpufreq_init) { |
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cpufreq_unregister_notifier(&acpi_processor_notifier_block, |
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CPUFREQ_POLICY_NOTIFIER); |
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acpi_processor_cpufreq_init = false; |
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} |
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cpuhp_remove_state_nocalls(hp_online); |
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cpuhp_remove_state_nocalls(CPUHP_ACPI_CPUDRV_DEAD); |
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driver_unregister(&acpi_processor_driver); |
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} |
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module_init(acpi_processor_driver_init); |
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module_exit(acpi_processor_driver_exit); |
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MODULE_ALIAS("processor");
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