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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test_ref_tracker.c (3127B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * Referrence tracker self test.
      4 *
      5 * Copyright (c) 2021 Eric Dumazet <edumazet@google.com>
      6 */
      7#include <linux/init.h>
      8#include <linux/module.h>
      9#include <linux/delay.h>
     10#include <linux/ref_tracker.h>
     11#include <linux/slab.h>
     12#include <linux/timer.h>
     13
     14static struct ref_tracker_dir ref_dir;
     15static struct ref_tracker *tracker[20];
     16
     17#define TRT_ALLOC(X) static noinline void 				\
     18	alloctest_ref_tracker_alloc##X(struct ref_tracker_dir *dir, 	\
     19				    struct ref_tracker **trackerp)	\
     20	{								\
     21		ref_tracker_alloc(dir, trackerp, GFP_KERNEL);		\
     22	}
     23
     24TRT_ALLOC(1)
     25TRT_ALLOC(2)
     26TRT_ALLOC(3)
     27TRT_ALLOC(4)
     28TRT_ALLOC(5)
     29TRT_ALLOC(6)
     30TRT_ALLOC(7)
     31TRT_ALLOC(8)
     32TRT_ALLOC(9)
     33TRT_ALLOC(10)
     34TRT_ALLOC(11)
     35TRT_ALLOC(12)
     36TRT_ALLOC(13)
     37TRT_ALLOC(14)
     38TRT_ALLOC(15)
     39TRT_ALLOC(16)
     40TRT_ALLOC(17)
     41TRT_ALLOC(18)
     42TRT_ALLOC(19)
     43
     44#undef TRT_ALLOC
     45
     46static noinline void
     47alloctest_ref_tracker_free(struct ref_tracker_dir *dir,
     48			   struct ref_tracker **trackerp)
     49{
     50	ref_tracker_free(dir, trackerp);
     51}
     52
     53
     54static struct timer_list test_ref_tracker_timer;
     55static atomic_t test_ref_timer_done = ATOMIC_INIT(0);
     56
     57static void test_ref_tracker_timer_func(struct timer_list *t)
     58{
     59	ref_tracker_alloc(&ref_dir, &tracker[0], GFP_ATOMIC);
     60	atomic_set(&test_ref_timer_done, 1);
     61}
     62
     63static int __init test_ref_tracker_init(void)
     64{
     65	int i;
     66
     67	ref_tracker_dir_init(&ref_dir, 100);
     68
     69	timer_setup(&test_ref_tracker_timer, test_ref_tracker_timer_func, 0);
     70	mod_timer(&test_ref_tracker_timer, jiffies + 1);
     71
     72	alloctest_ref_tracker_alloc1(&ref_dir, &tracker[1]);
     73	alloctest_ref_tracker_alloc2(&ref_dir, &tracker[2]);
     74	alloctest_ref_tracker_alloc3(&ref_dir, &tracker[3]);
     75	alloctest_ref_tracker_alloc4(&ref_dir, &tracker[4]);
     76	alloctest_ref_tracker_alloc5(&ref_dir, &tracker[5]);
     77	alloctest_ref_tracker_alloc6(&ref_dir, &tracker[6]);
     78	alloctest_ref_tracker_alloc7(&ref_dir, &tracker[7]);
     79	alloctest_ref_tracker_alloc8(&ref_dir, &tracker[8]);
     80	alloctest_ref_tracker_alloc9(&ref_dir, &tracker[9]);
     81	alloctest_ref_tracker_alloc10(&ref_dir, &tracker[10]);
     82	alloctest_ref_tracker_alloc11(&ref_dir, &tracker[11]);
     83	alloctest_ref_tracker_alloc12(&ref_dir, &tracker[12]);
     84	alloctest_ref_tracker_alloc13(&ref_dir, &tracker[13]);
     85	alloctest_ref_tracker_alloc14(&ref_dir, &tracker[14]);
     86	alloctest_ref_tracker_alloc15(&ref_dir, &tracker[15]);
     87	alloctest_ref_tracker_alloc16(&ref_dir, &tracker[16]);
     88	alloctest_ref_tracker_alloc17(&ref_dir, &tracker[17]);
     89	alloctest_ref_tracker_alloc18(&ref_dir, &tracker[18]);
     90	alloctest_ref_tracker_alloc19(&ref_dir, &tracker[19]);
     91
     92	/* free all trackers but first 0 and 1. */
     93	for (i = 2; i < ARRAY_SIZE(tracker); i++)
     94		alloctest_ref_tracker_free(&ref_dir, &tracker[i]);
     95
     96	/* Attempt to free an already freed tracker. */
     97	alloctest_ref_tracker_free(&ref_dir, &tracker[2]);
     98
     99	while (!atomic_read(&test_ref_timer_done))
    100		msleep(1);
    101
    102	/* This should warn about tracker[0] & tracker[1] being not freed. */
    103	ref_tracker_dir_exit(&ref_dir);
    104
    105	return 0;
    106}
    107
    108static void __exit test_ref_tracker_exit(void)
    109{
    110}
    111
    112module_init(test_ref_tracker_init);
    113module_exit(test_ref_tracker_exit);
    114
    115MODULE_LICENSE("GPL v2");