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![Riwen Lu](/assets/img/avatar_default.png)
Commit 239708a3af
("ACPI: Split out ACPI PSS from ACPI Processor
driver"), moves processor thermal registration to acpi_pss_perf_init(),
which doesn't get executed if ACPI_CPU_FREQ_PSS is not enabled.
As ARM64 supports P-states using CPPC, it should be possible to also
support processor passive cooling even if PSS is not enabled. Split
out the processor thermal cooling register from ACPI PSS to support
this, and move it into a separate function in processor_thermal.c.
Signed-off-by: Riwen Lu <luriwen@kylinos.cn>
Reviewed-by: Punit Agrawal <punit.agrawal@bytedance.com>
[ rjw: Subject edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
311 lines
7.5 KiB
C
311 lines
7.5 KiB
C
// 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 <andrew.grover@intel.com>
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* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
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* Copyright (C) 2004 Dominik Brodowski <linux@brodo.de>
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* Copyright (C) 2004 Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
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* - Added processor hotplug support
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* Copyright (C) 2013, Intel Corporation
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* Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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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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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_handle_debug(handle, "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)
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return 0;
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device = acpi_fetch_acpi_dev(pr->handle);
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if (!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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if (!pr || !acpi_fetch_acpi_dev(pr->handle))
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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 void acpi_pss_perf_init(struct acpi_processor *pr)
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{
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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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}
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#else
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static inline void acpi_pss_perf_init(struct acpi_processor *pr) {}
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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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acpi_pss_perf_init(pr);
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result = acpi_processor_thermal_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_processor_thermal_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_cppc_processor_exit(pr);
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acpi_processor_thermal_exit(pr, device);
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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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