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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133// SPDX-License-Identifier: GPL-2.0/* * syscore.c - Execution of system core operations. * * Copyright (C) 2011 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc. */
#include <linux/syscore_ops.h>#include <linux/mutex.h>#include <linux/module.h>#include <linux/suspend.h>#include <trace/events/power.h>
static LIST_HEAD(syscore_list);static DEFINE_MUTEX(syscore_lock);
/** * register_syscore - Register a set of system core operations. * @syscore: System core operations to register. */void register_syscore(struct syscore *syscore){ mutex_lock(&syscore_lock); list_add_tail(&syscore->node, &syscore_list); mutex_unlock(&syscore_lock);}EXPORT_SYMBOL_GPL(register_syscore);
/** * unregister_syscore - Unregister a set of system core operations. * @syscore: System core operations to unregister. */void unregister_syscore(struct syscore *syscore){ mutex_lock(&syscore_lock); list_del(&syscore->node); mutex_unlock(&syscore_lock);}EXPORT_SYMBOL_GPL(unregister_syscore);
#ifdef CONFIG_PM_SLEEP/** * syscore_suspend - Execute all the registered system core suspend callbacks. * * This function is executed with one CPU on-line and disabled interrupts. */int syscore_suspend(void){ struct syscore *syscore; int ret = 0;
trace_suspend_resume(TPS("syscore_suspend"), 0, true); pm_pr_dbg("Checking wakeup interrupts\n");
/* Return error code if there are any wakeup interrupts pending. */ if (pm_wakeup_pending()) return -EBUSY;
WARN_ONCE(!irqs_disabled(), "Interrupts enabled before system core suspend.\n");
list_for_each_entry_reverse(syscore, &syscore_list, node) if (syscore->ops->suspend) { pm_pr_dbg("Calling %pS\n", syscore->ops->suspend); ret = syscore->ops->suspend(syscore->data); if (ret) goto err_out; WARN_ONCE(!irqs_disabled(), "Interrupts enabled after %pS\n", syscore->ops->suspend); }
trace_suspend_resume(TPS("syscore_suspend"), 0, false); return 0;
err_out: pr_err("PM: System core suspend callback %pS failed.\n", syscore->ops->suspend);
list_for_each_entry_continue(syscore, &syscore_list, node) if (syscore->ops->resume) syscore->ops->resume(syscore->data);
return ret;}EXPORT_SYMBOL_GPL(syscore_suspend);
/** * syscore_resume - Execute all the registered system core resume callbacks. * * This function is executed with one CPU on-line and disabled interrupts. */void syscore_resume(void){ struct syscore *syscore;
trace_suspend_resume(TPS("syscore_resume"), 0, true); WARN_ONCE(!irqs_disabled(), "Interrupts enabled before system core resume.\n");
list_for_each_entry(syscore, &syscore_list, node) if (syscore->ops->resume) { pm_pr_dbg("Calling %pS\n", syscore->ops->resume); syscore->ops->resume(syscore->data); WARN_ONCE(!irqs_disabled(), "Interrupts enabled after %pS\n", syscore->ops->resume); } trace_suspend_resume(TPS("syscore_resume"), 0, false);}EXPORT_SYMBOL_GPL(syscore_resume);#endif /* CONFIG_PM_SLEEP */
/** * syscore_shutdown - Execute all the registered system core shutdown callbacks. */void syscore_shutdown(void){ struct syscore *syscore;
mutex_lock(&syscore_lock);
list_for_each_entry_reverse(syscore, &syscore_list, node) if (syscore->ops->shutdown) { if (initcall_debug) pr_info("PM: Calling %pS\n", syscore->ops->shutdown); syscore->ops->shutdown(syscore->data); }
mutex_unlock(&syscore_lock);}