1 // SPDX-License-Identifier: GPL-2.0-or-later
2
3 /*
4 * Copyright (c) Zilogic Systems Pvt. Ltd. <[email protected]>, 2018
5 * Copyright (c) Linux Test Project, 2019-2023
6 */
7
8 /*\
9 * [Description]
10 *
11 * Validating memfd_create() with MFD_HUGETLB and MFD_HUGE_x flags.
12 *
13 * Attempt to create files in the hugetlbfs filesystem using different huge page
14 * sizes.
15 *
16 * [Algorithm]
17 *
18 * memfd_create() should return non-negative value (fd) if the system supports
19 * that particular huge page size.
20 * On success, fd is returned. On failure, -1 is returned with ENODEV error.
21 */
22
23 #define _GNU_SOURCE
24
25 #include "tst_test.h"
26 #include "memfd_create_common.h"
27
28 #include <errno.h>
29 #include <stdio.h>
30
31 static struct test_flag {
32 int flag;
33 char *h_size;
34 int exp_err;
35 } test_flags[] = {
36 {.flag = MFD_HUGE_64KB, .h_size = "64kB"},
37 {.flag = MFD_HUGE_512KB, .h_size = "512kB"},
38 {.flag = MFD_HUGE_2MB, .h_size = "2048kB"},
39 {.flag = MFD_HUGE_8MB, .h_size = "8192kB"},
40 {.flag = MFD_HUGE_16MB, .h_size = "16384kB"},
41 {.flag = MFD_HUGE_256MB, .h_size = "262144kB"},
42 {.flag = MFD_HUGE_1GB, .h_size = "1048576kB"},
43 {.flag = MFD_HUGE_2GB, .h_size = "2097152kB"},
44 {.flag = MFD_HUGE_16GB, .h_size = "16777216kB"},
45 };
46
check_hugepage_support(struct test_flag * test_flags)47 static void check_hugepage_support(struct test_flag *test_flags)
48 {
49 char pattern[64];
50
51 sprintf(pattern, PATH_HUGEPAGES);
52 strcat(pattern, "hugepages-");
53 strcat(pattern, test_flags->h_size);
54
55 if (access(pattern, F_OK))
56 test_flags->exp_err = ENODEV;
57 }
58
memfd_huge_x_controller(unsigned int n)59 static void memfd_huge_x_controller(unsigned int n)
60 {
61 int fd;
62 struct test_flag tflag;
63
64 tflag = test_flags[n];
65 check_hugepage_support(&tflag);
66 tst_res(TINFO,
67 "Attempt to create file using %s huge page size",
68 tflag.h_size);
69
70 fd = sys_memfd_create("tfile", MFD_HUGETLB | tflag.flag);
71 if (fd < 0) {
72 if (errno == tflag.exp_err)
73 tst_res(TPASS, "Test failed as expected");
74 else
75 tst_brk(TFAIL | TERRNO,
76 "memfd_create() failed unexpectedly");
77 return;
78 }
79
80 tst_res(TPASS,
81 "memfd_create succeeded for %s page size",
82 tflag.h_size);
83
84 SAFE_CLOSE(fd);
85 }
86
setup(void)87 static void setup(void)
88 {
89 if (access(PATH_HUGEPAGES, F_OK))
90 tst_brk(TCONF, "Huge page is not supported");
91 }
92
93 static struct tst_test test = {
94 .setup = setup,
95 .test = memfd_huge_x_controller,
96 .tcnt = ARRAY_SIZE(test_flags),
97 .min_kver = "4.14",
98 };
99