mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-24 14:30:58 +07:00
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
/*
|
|
* syscore.c - Execution of system core operations.
|
|
*
|
|
* Copyright (C) 2011 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.
|
|
*
|
|
* This file is released under the GPLv2.
|
|
*/
|
|
|
|
#include <linux/syscore_ops.h>
|
|
#include <linux/mutex.h>
|
|
#include <linux/module.h>
|
|
|
|
static LIST_HEAD(syscore_ops_list);
|
|
static DEFINE_MUTEX(syscore_ops_lock);
|
|
|
|
/**
|
|
* register_syscore_ops - Register a set of system core operations.
|
|
* @ops: System core operations to register.
|
|
*/
|
|
void register_syscore_ops(struct syscore_ops *ops)
|
|
{
|
|
mutex_lock(&syscore_ops_lock);
|
|
list_add_tail(&ops->node, &syscore_ops_list);
|
|
mutex_unlock(&syscore_ops_lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(register_syscore_ops);
|
|
|
|
/**
|
|
* unregister_syscore_ops - Unregister a set of system core operations.
|
|
* @ops: System core operations to unregister.
|
|
*/
|
|
void unregister_syscore_ops(struct syscore_ops *ops)
|
|
{
|
|
mutex_lock(&syscore_ops_lock);
|
|
list_del(&ops->node);
|
|
mutex_unlock(&syscore_ops_lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(unregister_syscore_ops);
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
/**
|
|
* syscore_suspend - Execute all the registered system core suspend callbacks.
|
|
*
|
|
* This function is executed with one CPU on-line and disabled interrupts.
|
|
*/
|
|
int syscore_suspend(void)
|
|
{
|
|
struct syscore_ops *ops;
|
|
int ret = 0;
|
|
|
|
WARN_ONCE(!irqs_disabled(),
|
|
"Interrupts enabled before system core suspend.\n");
|
|
|
|
list_for_each_entry_reverse(ops, &syscore_ops_list, node)
|
|
if (ops->suspend) {
|
|
if (initcall_debug)
|
|
pr_info("PM: Calling %pF\n", ops->suspend);
|
|
ret = ops->suspend();
|
|
if (ret)
|
|
goto err_out;
|
|
WARN_ONCE(!irqs_disabled(),
|
|
"Interrupts enabled after %pF\n", ops->suspend);
|
|
}
|
|
|
|
return 0;
|
|
|
|
err_out:
|
|
pr_err("PM: System core suspend callback %pF failed.\n", ops->suspend);
|
|
|
|
list_for_each_entry_continue(ops, &syscore_ops_list, node)
|
|
if (ops->resume)
|
|
ops->resume();
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* syscore_resume - Execute all the registered system core resume callbacks.
|
|
*
|
|
* This function is executed with one CPU on-line and disabled interrupts.
|
|
*/
|
|
void syscore_resume(void)
|
|
{
|
|
struct syscore_ops *ops;
|
|
|
|
WARN_ONCE(!irqs_disabled(),
|
|
"Interrupts enabled before system core resume.\n");
|
|
|
|
list_for_each_entry(ops, &syscore_ops_list, node)
|
|
if (ops->resume) {
|
|
if (initcall_debug)
|
|
pr_info("PM: Calling %pF\n", ops->resume);
|
|
ops->resume();
|
|
WARN_ONCE(!irqs_disabled(),
|
|
"Interrupts enabled after %pF\n", ops->resume);
|
|
}
|
|
}
|
|
#endif /* CONFIG_PM_SLEEP */
|
|
|
|
/**
|
|
* syscore_shutdown - Execute all the registered system core shutdown callbacks.
|
|
*/
|
|
void syscore_shutdown(void)
|
|
{
|
|
struct syscore_ops *ops;
|
|
|
|
mutex_lock(&syscore_ops_lock);
|
|
|
|
list_for_each_entry_reverse(ops, &syscore_ops_list, node)
|
|
if (ops->shutdown) {
|
|
if (initcall_debug)
|
|
pr_info("PM: Calling %pF\n", ops->shutdown);
|
|
ops->shutdown();
|
|
}
|
|
|
|
mutex_unlock(&syscore_ops_lock);
|
|
}
|