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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * syscore.c - Execution of system core operations.
4 *
5 * Copyright (C) 2011 Rafael J. Wysocki <[email protected]>, Novell Inc.
6 */
7
8#include <linux/syscore_ops.h>
9#include <linux/mutex.h>
10#include <linux/module.h>
11#include <linux/suspend.h>
12#include <trace/events/power.h>
13
14static LIST_HEAD(syscore_list);
15static DEFINE_MUTEX(syscore_lock);
16
17/**
18 * register_syscore - Register a set of system core operations.
19 * @syscore: System core operations to register.
20 */
21void register_syscore(struct syscore *syscore)
22{
23 mutex_lock(&syscore_lock);
24 list_add_tail(&syscore->node, &syscore_list);
25 mutex_unlock(&syscore_lock);
26}
27EXPORT_SYMBOL_GPL(register_syscore);
28
29/**
30 * unregister_syscore - Unregister a set of system core operations.
31 * @syscore: System core operations to unregister.
32 */
33void unregister_syscore(struct syscore *syscore)
34{
35 mutex_lock(&syscore_lock);
36 list_del(&syscore->node);
37 mutex_unlock(&syscore_lock);
38}
39EXPORT_SYMBOL_GPL(unregister_syscore);
40
41#ifdef CONFIG_PM_SLEEP
42/**
43 * syscore_suspend - Execute all the registered system core suspend callbacks.
44 *
45 * This function is executed with one CPU on-line and disabled interrupts.
46 */
47int syscore_suspend(void)
48{
49 struct syscore *syscore;
50 int ret = 0;
51
52 trace_suspend_resume(TPS("syscore_suspend"), 0, true);
53 pm_pr_dbg("Checking wakeup interrupts\n");
54
55 /* Return error code if there are any wakeup interrupts pending. */
56 if (pm_wakeup_pending())
57 return -EBUSY;
58
59 WARN_ONCE(!irqs_disabled(),
60 "Interrupts enabled before system core suspend.\n");
61
62 list_for_each_entry_reverse(syscore, &syscore_list, node)
63 if (syscore->ops->suspend) {
64 pm_pr_dbg("Calling %pS\n", syscore->ops->suspend);
65 ret = syscore->ops->suspend(syscore->data);
66 if (ret)
67 goto err_out;
68 WARN_ONCE(!irqs_disabled(),
69 "Interrupts enabled after %pS\n",
70 syscore->ops->suspend);
71 }
72
73 trace_suspend_resume(TPS("syscore_suspend"), 0, false);
74 return 0;
75
76 err_out:
77 pr_err("PM: System core suspend callback %pS failed.\n",
78 syscore->ops->suspend);
79
80 list_for_each_entry_continue(syscore, &syscore_list, node)
81 if (syscore->ops->resume)
82 syscore->ops->resume(syscore->data);
83
84 return ret;
85}
86EXPORT_SYMBOL_GPL(syscore_suspend);
87
88/**
89 * syscore_resume - Execute all the registered system core resume callbacks.
90 *
91 * This function is executed with one CPU on-line and disabled interrupts.
92 */
93void syscore_resume(void)
94{
95 struct syscore *syscore;
96
97 trace_suspend_resume(TPS("syscore_resume"), 0, true);
98 WARN_ONCE(!irqs_disabled(),
99 "Interrupts enabled before system core resume.\n");
100
101 list_for_each_entry(syscore, &syscore_list, node)
102 if (syscore->ops->resume) {
103 pm_pr_dbg("Calling %pS\n", syscore->ops->resume);
104 syscore->ops->resume(syscore->data);
105 WARN_ONCE(!irqs_disabled(),
106 "Interrupts enabled after %pS\n",
107 syscore->ops->resume);
108 }
109 trace_suspend_resume(TPS("syscore_resume"), 0, false);
110}
111EXPORT_SYMBOL_GPL(syscore_resume);
112#endif /* CONFIG_PM_SLEEP */
113
114/**
115 * syscore_shutdown - Execute all the registered system core shutdown callbacks.
116 */
117void syscore_shutdown(void)
118{
119 struct syscore *syscore;
120
121 mutex_lock(&syscore_lock);
122
123 list_for_each_entry_reverse(syscore, &syscore_list, node)
124 if (syscore->ops->shutdown) {
125 if (initcall_debug)
126 pr_info("PM: Calling %pS\n",
127 syscore->ops->shutdown);
128 syscore->ops->shutdown(syscore->data);
129 }
130
131 mutex_unlock(&syscore_lock);
132}