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(dir: &ref_dir, trackerp: &tracker[0], GFP_ATOMIC);
60 atomic_set(v: &test_ref_timer_done, i: 1);
61}
62
63static int __init test_ref_tracker_init(void)
64{
65 int i;
66
67 ref_tracker_dir_init(dir: &ref_dir, quarantine_count: 100, name: "selftest");
68
69 timer_setup(&test_ref_tracker_timer, test_ref_tracker_timer_func, 0);
70 mod_timer(timer: &test_ref_tracker_timer, expires: jiffies + 1);
71
72 alloctest_ref_tracker_alloc1(dir: &ref_dir, trackerp: &tracker[1]);
73 alloctest_ref_tracker_alloc2(dir: &ref_dir, trackerp: &tracker[2]);
74 alloctest_ref_tracker_alloc3(dir: &ref_dir, trackerp: &tracker[3]);
75 alloctest_ref_tracker_alloc4(dir: &ref_dir, trackerp: &tracker[4]);
76 alloctest_ref_tracker_alloc5(dir: &ref_dir, trackerp: &tracker[5]);
77 alloctest_ref_tracker_alloc6(dir: &ref_dir, trackerp: &tracker[6]);
78 alloctest_ref_tracker_alloc7(dir: &ref_dir, trackerp: &tracker[7]);
79 alloctest_ref_tracker_alloc8(dir: &ref_dir, trackerp: &tracker[8]);
80 alloctest_ref_tracker_alloc9(dir: &ref_dir, trackerp: &tracker[9]);
81 alloctest_ref_tracker_alloc10(dir: &ref_dir, trackerp: &tracker[10]);
82 alloctest_ref_tracker_alloc11(dir: &ref_dir, trackerp: &tracker[11]);
83 alloctest_ref_tracker_alloc12(dir: &ref_dir, trackerp: &tracker[12]);
84 alloctest_ref_tracker_alloc13(dir: &ref_dir, trackerp: &tracker[13]);
85 alloctest_ref_tracker_alloc14(dir: &ref_dir, trackerp: &tracker[14]);
86 alloctest_ref_tracker_alloc15(dir: &ref_dir, trackerp: &tracker[15]);
87 alloctest_ref_tracker_alloc16(dir: &ref_dir, trackerp: &tracker[16]);
88 alloctest_ref_tracker_alloc17(dir: &ref_dir, trackerp: &tracker[17]);
89 alloctest_ref_tracker_alloc18(dir: &ref_dir, trackerp: &tracker[18]);
90 alloctest_ref_tracker_alloc19(dir: &ref_dir, trackerp: &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(dir: &ref_dir, trackerp: &tracker[i]);
95
96 /* Attempt to free an already freed tracker. */
97 alloctest_ref_tracker_free(dir: &ref_dir, trackerp: &tracker[2]);
98
99 while (!atomic_read(v: &test_ref_timer_done))
100 msleep(msecs: 1);
101
102 /* This should warn about tracker[0] & tracker[1] being not freed. */
103 ref_tracker_dir_exit(dir: &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");
116

source code of linux/lib/test_ref_tracker.c