mirror of https://github.com/torvalds/linux.git
133 lines
3.3 KiB
C
133 lines
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* syscore.c - Execution of system core operations.
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*
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* Copyright (C) 2011 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.
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*/
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#include <linux/syscore_ops.h>
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#include <linux/mutex.h>
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#include <linux/module.h>
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#include <linux/suspend.h>
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#include <trace/events/power.h>
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static LIST_HEAD(syscore_list);
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static DEFINE_MUTEX(syscore_lock);
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/**
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* register_syscore - Register a set of system core operations.
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* @syscore: System core operations to register.
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*/
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void register_syscore(struct syscore *syscore)
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{
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mutex_lock(&syscore_lock);
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list_add_tail(&syscore->node, &syscore_list);
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mutex_unlock(&syscore_lock);
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}
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EXPORT_SYMBOL_GPL(register_syscore);
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/**
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* unregister_syscore - Unregister a set of system core operations.
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* @syscore: System core operations to unregister.
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*/
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void unregister_syscore(struct syscore *syscore)
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{
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mutex_lock(&syscore_lock);
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list_del(&syscore->node);
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mutex_unlock(&syscore_lock);
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}
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EXPORT_SYMBOL_GPL(unregister_syscore);
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#ifdef CONFIG_PM_SLEEP
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/**
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* syscore_suspend - Execute all the registered system core suspend callbacks.
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*
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* This function is executed with one CPU on-line and disabled interrupts.
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*/
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int syscore_suspend(void)
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{
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struct syscore *syscore;
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int ret = 0;
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trace_suspend_resume(TPS("syscore_suspend"), 0, true);
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pm_pr_dbg("Checking wakeup interrupts\n");
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/* Return error code if there are any wakeup interrupts pending. */
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if (pm_wakeup_pending())
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return -EBUSY;
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WARN_ONCE(!irqs_disabled(),
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"Interrupts enabled before system core suspend.\n");
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list_for_each_entry_reverse(syscore, &syscore_list, node)
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if (syscore->ops->suspend) {
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pm_pr_dbg("Calling %pS\n", syscore->ops->suspend);
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ret = syscore->ops->suspend(syscore->data);
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if (ret)
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goto err_out;
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WARN_ONCE(!irqs_disabled(),
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"Interrupts enabled after %pS\n",
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syscore->ops->suspend);
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}
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trace_suspend_resume(TPS("syscore_suspend"), 0, false);
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return 0;
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err_out:
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pr_err("PM: System core suspend callback %pS failed.\n",
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syscore->ops->suspend);
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list_for_each_entry_continue(syscore, &syscore_list, node)
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if (syscore->ops->resume)
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syscore->ops->resume(syscore->data);
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return ret;
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}
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EXPORT_SYMBOL_GPL(syscore_suspend);
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/**
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* syscore_resume - Execute all the registered system core resume callbacks.
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*
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* This function is executed with one CPU on-line and disabled interrupts.
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*/
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void syscore_resume(void)
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{
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struct syscore *syscore;
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trace_suspend_resume(TPS("syscore_resume"), 0, true);
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WARN_ONCE(!irqs_disabled(),
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"Interrupts enabled before system core resume.\n");
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list_for_each_entry(syscore, &syscore_list, node)
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if (syscore->ops->resume) {
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pm_pr_dbg("Calling %pS\n", syscore->ops->resume);
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syscore->ops->resume(syscore->data);
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WARN_ONCE(!irqs_disabled(),
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"Interrupts enabled after %pS\n",
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syscore->ops->resume);
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}
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trace_suspend_resume(TPS("syscore_resume"), 0, false);
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}
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EXPORT_SYMBOL_GPL(syscore_resume);
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#endif /* CONFIG_PM_SLEEP */
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/**
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* syscore_shutdown - Execute all the registered system core shutdown callbacks.
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*/
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void syscore_shutdown(void)
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{
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struct syscore *syscore;
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mutex_lock(&syscore_lock);
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list_for_each_entry_reverse(syscore, &syscore_list, node)
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if (syscore->ops->shutdown) {
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if (initcall_debug)
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pr_info("PM: Calling %pS\n",
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syscore->ops->shutdown);
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syscore->ops->shutdown(syscore->data);
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}
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mutex_unlock(&syscore_lock);
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}
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