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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pm-notifier-error-inject.c (1183B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2#include <linux/kernel.h>
      3#include <linux/module.h>
      4#include <linux/suspend.h>
      5
      6#include "notifier-error-inject.h"
      7
      8static int priority;
      9module_param(priority, int, 0);
     10MODULE_PARM_DESC(priority, "specify PM notifier priority");
     11
     12static struct notifier_err_inject pm_notifier_err_inject = {
     13	.actions = {
     14		{ NOTIFIER_ERR_INJECT_ACTION(PM_HIBERNATION_PREPARE) },
     15		{ NOTIFIER_ERR_INJECT_ACTION(PM_SUSPEND_PREPARE) },
     16		{ NOTIFIER_ERR_INJECT_ACTION(PM_RESTORE_PREPARE) },
     17		{}
     18	}
     19};
     20
     21static struct dentry *dir;
     22
     23static int err_inject_init(void)
     24{
     25	int err;
     26
     27	dir = notifier_err_inject_init("pm", notifier_err_inject_dir,
     28					&pm_notifier_err_inject, priority);
     29	if (IS_ERR(dir))
     30		return PTR_ERR(dir);
     31
     32	err = register_pm_notifier(&pm_notifier_err_inject.nb);
     33	if (err)
     34		debugfs_remove_recursive(dir);
     35
     36	return err;
     37}
     38
     39static void err_inject_exit(void)
     40{
     41	unregister_pm_notifier(&pm_notifier_err_inject.nb);
     42	debugfs_remove_recursive(dir);
     43}
     44
     45module_init(err_inject_init);
     46module_exit(err_inject_exit);
     47
     48MODULE_DESCRIPTION("PM notifier error injection module");
     49MODULE_LICENSE("GPL");
     50MODULE_AUTHOR("Akinobu Mita <akinobu.mita@gmail.com>");