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128 lines
3.2 KiB
128 lines
3.2 KiB
// 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 <[email protected]>, 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_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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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(ops, &syscore_ops_list, node) |
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if (ops->suspend) { |
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pm_pr_dbg("Calling %pS\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 %pS\n", 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", 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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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_ops *ops; |
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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(ops, &syscore_ops_list, node) |
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if (ops->resume) { |
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pm_pr_dbg("Calling %pS\n", ops->resume); |
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ops->resume(); |
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WARN_ONCE(!irqs_disabled(), |
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"Interrupts enabled after %pS\n", 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_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 %pS\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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