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 perform Direct Write/Read from/To hugetlbfs file
11 * which is mapped to process address space. The test is checking if it
12 * succeeds and data written or read is not corrupted.
13 */
14
15 #define _GNU_SOURCE
16 #include <stdio.h>
17 #include <sys/mount.h>
18 #include <limits.h>
19 #include <sys/param.h>
20 #include <sys/types.h>
21
22 #include "hugetlb.h"
23
24 #define P0 "ffffffff"
25 #define IOSZ 4096
26 #define NORMAL_PATH ""
27 #define MNTPOINT "hugetlbfs/"
28
29 static long hpage_size;
30 static int fd = -1, nfd = -1;
31
run_test(void)32 static void run_test(void)
33 {
34 void *p;
35 char buf[IOSZ] __attribute__((aligned(IOSZ)));
36
37 fd = tst_creat_unlinked(MNTPOINT, 0);
38 nfd = tst_creat_unlinked(NORMAL_PATH, O_DIRECT);
39 p = SAFE_MMAP(NULL, hpage_size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
40 memcpy(p, P0, 8);
41
42 SAFE_WRITE(1, nfd, p, IOSZ);
43 SAFE_LSEEK(nfd, 0, SEEK_SET);
44
45 SAFE_READ(1, nfd, buf, IOSZ);
46 if (memcmp(P0, buf, 8)) {
47 tst_res(TFAIL, "Memory mismatch after Direct-IO write");
48 goto cleanup;
49 }
50 SAFE_LSEEK(nfd, 0, SEEK_SET);
51
52 memset(p, 0, IOSZ);
53 SAFE_READ(1, nfd, p, IOSZ);
54
55 if (memcmp(p, P0, 8))
56 tst_res(TFAIL, "Memory mismatch after Direct-IO read");
57 else
58 tst_res(TPASS, "Direct-IO read/write to/from hugepages is successful");
59 cleanup:
60 SAFE_MUNMAP(p, hpage_size);
61 SAFE_CLOSE(fd);
62 SAFE_CLOSE(nfd);
63 }
64
setup(void)65 static void setup(void)
66 {
67 hpage_size = SAFE_READ_MEMINFO(MEMINFO_HPAGE_SIZE)*1024;
68 }
69
cleanup(void)70 static void cleanup(void)
71 {
72 if (fd > 0)
73 SAFE_CLOSE(fd);
74 if (nfd > 0)
75 SAFE_CLOSE(nfd);
76 }
77
78 static struct tst_test test = {
79 .needs_root = 1,
80 .mntpoint = MNTPOINT,
81 .needs_hugetlbfs = 1,
82 .setup = setup,
83 .cleanup = cleanup,
84 .test_all = run_test,
85 .hugepages = {1, TST_NEEDS},
86 };
87