Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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kernel
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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
13static LIST_HEAD(syscore_ops_list);
14static DEFINE_MUTEX(syscore_ops_lock);
15
16/**
17 * register_syscore_ops - Register a set of system core operations.
18 * @ops: System core operations to register.
19 */
20void register_syscore_ops(struct syscore_ops *ops)
21{
22 mutex_lock(&syscore_ops_lock);
23 list_add_tail(&ops->node, &syscore_ops_list);
24 mutex_unlock(&syscore_ops_lock);
25}
26EXPORT_SYMBOL_GPL(register_syscore_ops);
27
28/**
29 * unregister_syscore_ops - Unregister a set of system core operations.
30 * @ops: System core operations to unregister.
31 */
32void unregister_syscore_ops(struct syscore_ops *ops)
33{
34 mutex_lock(&syscore_ops_lock);
35 list_del(&ops->node);
36 mutex_unlock(&syscore_ops_lock);
37}
38EXPORT_SYMBOL_GPL(unregister_syscore_ops);
39
40#ifdef CONFIG_PM_SLEEP
41/**
42 * syscore_suspend - Execute all the registered system core suspend callbacks.
43 *
44 * This function is executed with one CPU on-line and disabled interrupts.
45 */
46int syscore_suspend(void)
47{
48 struct syscore_ops *ops;
49 int ret = 0;
50
51 WARN_ONCE(!irqs_disabled(),
52 "Interrupts enabled before system core suspend.\n");
53
54 list_for_each_entry_reverse(ops, &syscore_ops_list, node)
55 if (ops->suspend) {
56 if (initcall_debug)
57 pr_info("PM: Calling %pF\n", ops->suspend);
58 ret = ops->suspend();
59 if (ret)
60 goto err_out;
61 WARN_ONCE(!irqs_disabled(),
62 "Interrupts enabled after %pF\n", ops->suspend);
63 }
64
65 return 0;
66
67 err_out:
68 pr_err("PM: System core suspend callback %pF failed.\n", ops->suspend);
69
70 list_for_each_entry_continue(ops, &syscore_ops_list, node)
71 if (ops->resume)
72 ops->resume();
73
74 return ret;
75}
76
77/**
78 * syscore_resume - Execute all the registered system core resume callbacks.
79 *
80 * This function is executed with one CPU on-line and disabled interrupts.
81 */
82void syscore_resume(void)
83{
84 struct syscore_ops *ops;
85
86 WARN_ONCE(!irqs_disabled(),
87 "Interrupts enabled before system core resume.\n");
88
89 list_for_each_entry(ops, &syscore_ops_list, node)
90 if (ops->resume) {
91 if (initcall_debug)
92 pr_info("PM: Calling %pF\n", ops->resume);
93 ops->resume();
94 WARN_ONCE(!irqs_disabled(),
95 "Interrupts enabled after %pF\n", ops->resume);
96 }
97}
98#endif /* CONFIG_PM_SLEEP */
99
100/**
101 * syscore_shutdown - Execute all the registered system core shutdown callbacks.
102 */
103void syscore_shutdown(void)
104{
105 struct syscore_ops *ops;
106
107 mutex_lock(&syscore_ops_lock);
108
109 list_for_each_entry_reverse(ops, &syscore_ops_list, node)
110 if (ops->shutdown) {
111 if (initcall_debug)
112 pr_info("PM: Calling %pF\n", ops->shutdown);
113 ops->shutdown();
114 }
115
116 mutex_unlock(&syscore_ops_lock);
117}