40dc166cb5
Some subsystems need to carry out suspend/resume and shutdown operations with one CPU on-line and interrupts disabled. The only way to register such operations is to define a sysdev class and a sysdev specifically for this purpose which is cumbersome and inefficient. Moreover, the arguments taken by sysdev suspend, resume and shutdown callbacks are practically never necessary. For this reason, introduce a simpler interface allowing subsystems to register operations to be executed very late during system suspend and shutdown and very early during resume in the form of strcut syscore_ops objects. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
118 lines
2.7 KiB
C
118 lines
2.7 KiB
C
/*
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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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* This file is released under the GPLv2.
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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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static LIST_HEAD(syscore_ops_list);
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static DEFINE_MUTEX(syscore_ops_lock);
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/**
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* register_syscore_ops - Register a set of system core operations.
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* @ops: System core operations to register.
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*/
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void register_syscore_ops(struct syscore_ops *ops)
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{
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mutex_lock(&syscore_ops_lock);
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list_add_tail(&ops->node, &syscore_ops_list);
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mutex_unlock(&syscore_ops_lock);
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}
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EXPORT_SYMBOL_GPL(register_syscore_ops);
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/**
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* unregister_syscore_ops - Unregister a set of system core operations.
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* @ops: System core operations to unregister.
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*/
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void unregister_syscore_ops(struct syscore_ops *ops)
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{
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mutex_lock(&syscore_ops_lock);
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list_del(&ops->node);
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mutex_unlock(&syscore_ops_lock);
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}
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EXPORT_SYMBOL_GPL(unregister_syscore_ops);
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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_ops *ops;
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int ret = 0;
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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(ops, &syscore_ops_list, node)
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if (ops->suspend) {
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if (initcall_debug)
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pr_info("PM: Calling %pF\n", ops->suspend);
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ret = ops->suspend();
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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 %pF\n", ops->suspend);
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}
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return 0;
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err_out:
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pr_err("PM: System core suspend callback %pF failed.\n", ops->suspend);
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list_for_each_entry_continue(ops, &syscore_ops_list, node)
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if (ops->resume)
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ops->resume();
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return ret;
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}
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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_ops *ops;
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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(ops, &syscore_ops_list, node)
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if (ops->resume) {
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if (initcall_debug)
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pr_info("PM: Calling %pF\n", ops->resume);
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ops->resume();
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WARN_ONCE(!irqs_disabled(),
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"Interrupts enabled after %pF\n", ops->resume);
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}
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}
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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_ops *ops;
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mutex_lock(&syscore_ops_lock);
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list_for_each_entry_reverse(ops, &syscore_ops_list, node)
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if (ops->shutdown) {
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if (initcall_debug)
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pr_info("PM: Calling %pF\n", ops->shutdown);
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ops->shutdown();
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}
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mutex_unlock(&syscore_ops_lock);
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}
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