Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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kernel
os
linux
1/*
2 * syscore.c - Execution of system core operations.
3 *
4 * Copyright (C) 2011 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.
5 *
6 * This file is released under the GPLv2.
7 */
8
9#include <linux/syscore_ops.h>
10#include <linux/mutex.h>
11#include <linux/module.h>
12#include <linux/interrupt.h>
13#include <trace/events/power.h>
14
15static LIST_HEAD(syscore_ops_list);
16static DEFINE_MUTEX(syscore_ops_lock);
17
18/**
19 * register_syscore_ops - Register a set of system core operations.
20 * @ops: System core operations to register.
21 */
22void register_syscore_ops(struct syscore_ops *ops)
23{
24 mutex_lock(&syscore_ops_lock);
25 list_add_tail(&ops->node, &syscore_ops_list);
26 mutex_unlock(&syscore_ops_lock);
27}
28EXPORT_SYMBOL_GPL(register_syscore_ops);
29
30/**
31 * unregister_syscore_ops - Unregister a set of system core operations.
32 * @ops: System core operations to unregister.
33 */
34void unregister_syscore_ops(struct syscore_ops *ops)
35{
36 mutex_lock(&syscore_ops_lock);
37 list_del(&ops->node);
38 mutex_unlock(&syscore_ops_lock);
39}
40EXPORT_SYMBOL_GPL(unregister_syscore_ops);
41
42#ifdef CONFIG_PM_SLEEP
43/**
44 * syscore_suspend - Execute all the registered system core suspend callbacks.
45 *
46 * This function is executed with one CPU on-line and disabled interrupts.
47 */
48int syscore_suspend(void)
49{
50 struct syscore_ops *ops;
51 int ret = 0;
52
53 trace_suspend_resume(TPS("syscore_suspend"), 0, true);
54 pr_debug("Checking wakeup interrupts\n");
55
56 /* Return error code if there are any wakeup interrupts pending. */
57 ret = check_wakeup_irqs();
58 if (ret)
59 return ret;
60
61 WARN_ONCE(!irqs_disabled(),
62 "Interrupts enabled before system core suspend.\n");
63
64 list_for_each_entry_reverse(ops, &syscore_ops_list, node)
65 if (ops->suspend) {
66 if (initcall_debug)
67 pr_info("PM: Calling %pF\n", ops->suspend);
68 ret = ops->suspend();
69 if (ret)
70 goto err_out;
71 WARN_ONCE(!irqs_disabled(),
72 "Interrupts enabled after %pF\n", ops->suspend);
73 }
74
75 trace_suspend_resume(TPS("syscore_suspend"), 0, false);
76 return 0;
77
78 err_out:
79 pr_err("PM: System core suspend callback %pF failed.\n", ops->suspend);
80
81 list_for_each_entry_continue(ops, &syscore_ops_list, node)
82 if (ops->resume)
83 ops->resume();
84
85 return ret;
86}
87EXPORT_SYMBOL_GPL(syscore_suspend);
88
89/**
90 * syscore_resume - Execute all the registered system core resume callbacks.
91 *
92 * This function is executed with one CPU on-line and disabled interrupts.
93 */
94void syscore_resume(void)
95{
96 struct syscore_ops *ops;
97
98 trace_suspend_resume(TPS("syscore_resume"), 0, true);
99 WARN_ONCE(!irqs_disabled(),
100 "Interrupts enabled before system core resume.\n");
101
102 list_for_each_entry(ops, &syscore_ops_list, node)
103 if (ops->resume) {
104 if (initcall_debug)
105 pr_info("PM: Calling %pF\n", ops->resume);
106 ops->resume();
107 WARN_ONCE(!irqs_disabled(),
108 "Interrupts enabled after %pF\n", ops->resume);
109 }
110 trace_suspend_resume(TPS("syscore_resume"), 0, false);
111}
112EXPORT_SYMBOL_GPL(syscore_resume);
113#endif /* CONFIG_PM_SLEEP */
114
115/**
116 * syscore_shutdown - Execute all the registered system core shutdown callbacks.
117 */
118void syscore_shutdown(void)
119{
120 struct syscore_ops *ops;
121
122 mutex_lock(&syscore_ops_lock);
123
124 list_for_each_entry_reverse(ops, &syscore_ops_list, node)
125 if (ops->shutdown) {
126 if (initcall_debug)
127 pr_info("PM: Calling %pF\n", ops->shutdown);
128 ops->shutdown();
129 }
130
131 mutex_unlock(&syscore_ops_lock);
132}