cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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syscore.c (3258B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 *  syscore.c - Execution of system core operations.
      4 *
      5 *  Copyright (C) 2011 Rafael J. Wysocki <rjw@sisk.pl>, 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_ops_list);
     15static DEFINE_MUTEX(syscore_ops_lock);
     16
     17/**
     18 * register_syscore_ops - Register a set of system core operations.
     19 * @ops: System core operations to register.
     20 */
     21void register_syscore_ops(struct syscore_ops *ops)
     22{
     23	mutex_lock(&syscore_ops_lock);
     24	list_add_tail(&ops->node, &syscore_ops_list);
     25	mutex_unlock(&syscore_ops_lock);
     26}
     27EXPORT_SYMBOL_GPL(register_syscore_ops);
     28
     29/**
     30 * unregister_syscore_ops - Unregister a set of system core operations.
     31 * @ops: System core operations to unregister.
     32 */
     33void unregister_syscore_ops(struct syscore_ops *ops)
     34{
     35	mutex_lock(&syscore_ops_lock);
     36	list_del(&ops->node);
     37	mutex_unlock(&syscore_ops_lock);
     38}
     39EXPORT_SYMBOL_GPL(unregister_syscore_ops);
     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_ops *ops;
     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(ops, &syscore_ops_list, node)
     63		if (ops->suspend) {
     64			pm_pr_dbg("Calling %pS\n", ops->suspend);
     65			ret = ops->suspend();
     66			if (ret)
     67				goto err_out;
     68			WARN_ONCE(!irqs_disabled(),
     69				"Interrupts enabled after %pS\n", ops->suspend);
     70		}
     71
     72	trace_suspend_resume(TPS("syscore_suspend"), 0, false);
     73	return 0;
     74
     75 err_out:
     76	pr_err("PM: System core suspend callback %pS failed.\n", ops->suspend);
     77
     78	list_for_each_entry_continue(ops, &syscore_ops_list, node)
     79		if (ops->resume)
     80			ops->resume();
     81
     82	return ret;
     83}
     84EXPORT_SYMBOL_GPL(syscore_suspend);
     85
     86/**
     87 * syscore_resume - Execute all the registered system core resume callbacks.
     88 *
     89 * This function is executed with one CPU on-line and disabled interrupts.
     90 */
     91void syscore_resume(void)
     92{
     93	struct syscore_ops *ops;
     94
     95	trace_suspend_resume(TPS("syscore_resume"), 0, true);
     96	WARN_ONCE(!irqs_disabled(),
     97		"Interrupts enabled before system core resume.\n");
     98
     99	list_for_each_entry(ops, &syscore_ops_list, node)
    100		if (ops->resume) {
    101			pm_pr_dbg("Calling %pS\n", ops->resume);
    102			ops->resume();
    103			WARN_ONCE(!irqs_disabled(),
    104				"Interrupts enabled after %pS\n", ops->resume);
    105		}
    106	trace_suspend_resume(TPS("syscore_resume"), 0, false);
    107}
    108EXPORT_SYMBOL_GPL(syscore_resume);
    109#endif /* CONFIG_PM_SLEEP */
    110
    111/**
    112 * syscore_shutdown - Execute all the registered system core shutdown callbacks.
    113 */
    114void syscore_shutdown(void)
    115{
    116	struct syscore_ops *ops;
    117
    118	mutex_lock(&syscore_ops_lock);
    119
    120	list_for_each_entry_reverse(ops, &syscore_ops_list, node)
    121		if (ops->shutdown) {
    122			if (initcall_debug)
    123				pr_info("PM: Calling %pS\n", ops->shutdown);
    124			ops->shutdown();
    125		}
    126
    127	mutex_unlock(&syscore_ops_lock);
    128}