| /* |
| * 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; |
| } |
| |
| 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_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; |
| } |
| |
| 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; |
| } |
| } |
| #else |
| static 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_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; |
| |
| 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 */ |
| get_online_cpus(); |
| ret = __acpi_processor_start(device); |
| put_online_cpus(); |
| 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; |
| } |
| |
| /* |
| * 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; |
| } |
| |
| 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); |
| } |
| |
| module_init(acpi_processor_driver_init); |
| module_exit(acpi_processor_driver_exit); |
| |
| MODULE_ALIAS("processor"); |