1 // SPDX-License-Identifier: LGPL-2.1-or-later
2 /*
3 * Copyright (C) 2005-2006 IBM Corporation.
4 * Author: David Gibson & Adam Litke
5 */
6
7 /*\
8 * [Description]
9 *
10 * This test is basic shared mapping test. Two shared mappings are created
11 * with same offset on a file. It checks if writing to one mapping can be
12 * seen to other mapping or not?
13 */
14
15 #include "hugetlb.h"
16
17 #define RANDOM_CONSTANT 0x1234ABCD
18 #define MNTPOINT "hugetlbfs/"
19
20 static long hpage_size;
21 static int fd = -1;
22
run_test(void)23 static void run_test(void)
24 {
25 void *p, *q;
26 unsigned long *pl, *ql;
27 unsigned long i;
28
29 fd = tst_creat_unlinked(MNTPOINT, 0);
30 p = SAFE_MMAP(NULL, hpage_size, PROT_READ|PROT_WRITE, MAP_SHARED,
31 fd, 0);
32
33 q = SAFE_MMAP(NULL, hpage_size, PROT_READ|PROT_WRITE, MAP_SHARED,
34 fd, 0);
35
36 pl = p;
37 for (i = 0; i < (hpage_size / sizeof(*pl)); i++)
38 pl[i] = RANDOM_CONSTANT ^ i;
39
40 ql = q;
41 for (i = 0; i < (hpage_size / sizeof(*ql)); i++) {
42 if (ql[i] != (RANDOM_CONSTANT ^ i)) {
43 tst_res(TFAIL, "Mismatch at offset %lu, Got: %lu, Expected: %lu",
44 i, ql[i], RANDOM_CONSTANT ^ i);
45 goto cleanup;
46 }
47 }
48
49 tst_res(TPASS, "Successfully tested data between two shared mappings");
50 cleanup:
51 SAFE_MUNMAP(p, hpage_size);
52 SAFE_MUNMAP(q, hpage_size);
53 SAFE_CLOSE(fd);
54 }
55
setup(void)56 static void setup(void)
57 {
58 hpage_size = tst_get_hugepage_size();
59 }
60
cleanup(void)61 static void cleanup(void)
62 {
63 if (fd >= 0)
64 SAFE_CLOSE(fd);
65 }
66
67 static struct tst_test test = {
68 .needs_root = 1,
69 .mntpoint = MNTPOINT,
70 .needs_hugetlbfs = 1,
71 .needs_tmpdir = 1,
72 .setup = setup,
73 .cleanup = cleanup,
74 .test_all = run_test,
75 .hugepages = {2, TST_NEEDS},
76 };
77