1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Reference 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
14 static struct ref_tracker_dir ref_dir;
15 static 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
24 TRT_ALLOC(1)
25 TRT_ALLOC(2)
26 TRT_ALLOC(3)
27 TRT_ALLOC(4)
28 TRT_ALLOC(5)
29 TRT_ALLOC(6)
30 TRT_ALLOC(7)
31 TRT_ALLOC(8)
32 TRT_ALLOC(9)
33 TRT_ALLOC(10)
34 TRT_ALLOC(11)
35 TRT_ALLOC(12)
36 TRT_ALLOC(13)
37 TRT_ALLOC(14)
38 TRT_ALLOC(15)
39 TRT_ALLOC(16)
40 TRT_ALLOC(17)
41 TRT_ALLOC(18)
42 TRT_ALLOC(19)
43
44 #undef TRT_ALLOC
45
46 static noinline void
47 alloctest_ref_tracker_free(struct ref_tracker_dir *dir,
48 struct ref_tracker **trackerp)
49 {
50 ref_tracker_free(dir, trackerp);
51 }
52
53
54 static struct timer_list test_ref_tracker_timer;
55 static atomic_t test_ref_timer_done = ATOMIC_INIT(0);
56
57 static 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
63 static int __init test_ref_tracker_init(void)
64 {
65 int i;
66
67 ref_tracker_dir_init(&ref_dir, 100, "selftest");
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
108 static void __exit test_ref_tracker_exit(void)
109 {
110 }
111
112 module_init(test_ref_tracker_init);
113 module_exit(test_ref_tracker_exit);
114
115 MODULE_DESCRIPTION("Reference tracker self test");
116 MODULE_LICENSE("GPL v2");
117
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