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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memory-notifier-error-inject.c (1157B)

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