1 /*
2 * Copyright (c) International Business Machines Corp., 2004
3 * Copyright (c) Linux Test Project, 2004-2017
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
13 * the GNU General Public License for more details.
14 */
15
16 /*
17 * Test Name: hugemmap04
18 *
19 * Test Description:
20 * Verify that, a hugetlb mmap() succeeds when used to map the largest
21 * size possible.
22 *
23 * Expected Result:
24 * mmap() should succeed returning the address of the hugetlb mapped region.
25 * The number of free huge pages should decrease.
26 *
27 * Test:
28 * Loop if the proper options are given.
29 * Execute system call
30 * Check return code, if system call failed (return=-1)
31 * Log the errno and Issue a FAIL message.
32 *
33 * HISTORY
34 * 04/2004 Written by Robbie Williamson
35 */
36
37 #include <sys/mount.h>
38 #include <stdio.h>
39 #include <limits.h>
40 #include <sys/param.h>
41 #include "lapi/abisize.h"
42 #include "hugetlb.h"
43
44 static struct tst_option options[] = {
45 {"H:", &Hopt, "-H /.. Location of hugetlbfs, i.e. -H /var/hugetlbfs"},
46 {"s:", &nr_opt, "-s num Set the number of the been allocated hugepages"},
47 {NULL, NULL, NULL}
48 };
49
50 static char TEMPFILE[MAXPATHLEN];
51
52 static long *addr;
53 static long long mapsize;
54 static int fildes;
55 static long freepages;
56 static long beforetest;
57 static long aftertest;
58 static long hugepagesmapped;
59 static long hugepages = 128;
60
test_hugemmap(void)61 static void test_hugemmap(void)
62 {
63 int huge_pagesize = 0;
64
65 /* Creat a temporary file used for huge mapping */
66 fildes = SAFE_OPEN(TEMPFILE, O_RDWR | O_CREAT, 0666);
67
68 freepages = SAFE_READ_MEMINFO("HugePages_Free:");
69 beforetest = freepages;
70
71 huge_pagesize = SAFE_READ_MEMINFO("Hugepagesize:");
72 tst_res(TINFO, "Size of huge pages is %d KB", huge_pagesize);
73
74 #ifdef TST_ABI32
75 tst_res(TINFO, "Total amount of free huge pages is %d",
76 freepages);
77 tst_res(TINFO, "Max number allowed for 1 mmap file in"
78 " 32-bits is 128");
79 if (freepages > 128)
80 freepages = 128;
81 #endif
82 mapsize = (long long)freepages * huge_pagesize * 1024;
83 addr = mmap(NULL, mapsize, PROT_READ | PROT_WRITE,
84 MAP_SHARED, fildes, 0);
85 if (addr == MAP_FAILED) {
86 tst_res(TFAIL | TERRNO, "mmap() Failed on %s",
87 TEMPFILE);
88 } else {
89 tst_res(TPASS,
90 "Succeeded mapping file using %ld pages",
91 freepages);
92
93 /* force to allocate page and change HugePages_Free */
94 *(int *)addr = 0;
95 /* Make sure the number of free huge pages AFTER testing decreased */
96 aftertest = SAFE_READ_MEMINFO("HugePages_Free:");
97 hugepagesmapped = beforetest - aftertest;
98 if (hugepagesmapped < 1)
99 tst_res(TWARN, "Number of HUGEPAGES_FREE stayed the"
100 " same. Okay if multiple copies running due"
101 " to test collision.");
102 }
103
104 munmap(addr, mapsize);
105 close(fildes);
106 }
107
setup(void)108 void setup(void)
109 {
110 save_nr_hugepages();
111
112 if (!Hopt)
113 Hopt = tst_get_tmpdir();
114 SAFE_MOUNT("none", Hopt, "hugetlbfs", 0, NULL);
115
116 if (nr_opt)
117 hugepages = SAFE_STRTOL(nr_opt, 0, LONG_MAX);
118
119 limit_hugepages(&hugepages);
120 set_sys_tune("nr_hugepages", hugepages, 1);
121
122 snprintf(TEMPFILE, sizeof(TEMPFILE), "%s/mmapfile%d", Hopt, getpid());
123 }
124
cleanup(void)125 void cleanup(void)
126 {
127 unlink(TEMPFILE);
128 restore_nr_hugepages();
129
130 umount(Hopt);
131 }
132
133 static struct tst_test test = {
134 .needs_root = 1,
135 .needs_tmpdir = 1,
136 .options = options,
137 .setup = setup,
138 .cleanup = cleanup,
139 .test_all = test_hugemmap,
140 };
141