testcases/kernel/mem/hugetlb/hugemmap/hugemmap22.c

// SPDX-License-Identifier: LGPL-2.1-or-later
/*
 * Copyright (C) 2005-2006 IBM Corporation.
 * Author: David Gibson & Adam Litke
 */

/*\
 * [Description]
 *
 * This baseline test validates that a mapping of a certain size can be
 * created, correctly. Once created, all the pages are filled with a
 * pattern and rechecked to test for corruption. The mapping is then
 * released. This process is repeated for a specified number of
 * iterations.
 */

#include "hugetlb.h"

#define NR_HUGEPAGES 2
#define MNTPOINT "hugetlbfs/"

static unsigned long hpage_size;
static int fd = -1;

static void run_test(unsigned int iter)
{
	char *m;
	size_t i, j;
	char pattern = 'A';
	size_t size = NR_HUGEPAGES*hpage_size;

	fd = tst_creat_unlinked(MNTPOINT, 0);
	m = SAFE_MMAP(NULL, size, (PROT_READ|PROT_WRITE), MAP_SHARED, fd, 0);

	for (i = 0; i < NR_HUGEPAGES; i++) {
		for (j = 0; j < hpage_size; j++) {
			if (*(m+(i*hpage_size)+j) != 0) {
				tst_res(TFAIL, "Iter %u: Verifying the mmap area failed. "
				     "Got %c, expected 0", iter,
				     *(m+(i*hpage_size)+j));
				goto cleanup;
			}
		}
	}

	for (i = 0; i < NR_HUGEPAGES; i++) {
		pattern = 65+(i%26);
		memset(m+(i*hpage_size), pattern, hpage_size);
	}

	for (i = 0; i < NR_HUGEPAGES; i++) {
		pattern = 65+(i%26);
		for (j = 0; j < hpage_size; j++) {
			if (*(m+(i*hpage_size)+j) != pattern) {
				tst_res(TFAIL, "Iter %u: Verifying the mmap area failed. "
				     "got: %c, expected: %c", iter,
				     *(m+(i*hpage_size)+j), pattern);
				goto cleanup;
			}
		}
	}

	tst_res(TPASS, "Iter %u: Successfully verified the mmap area.", iter);

cleanup:
	SAFE_MUNMAP(m, size);
	SAFE_CLOSE(fd);
}

static void setup(void)
{
	hpage_size = tst_get_hugepage_size();
}

static void cleanup(void)
{
	if (fd >= 0)
		SAFE_CLOSE(fd);
}

static struct tst_test test = {
	.tcnt = 2,
	.needs_root = 1,
	.mntpoint = MNTPOINT,
	.needs_hugetlbfs = 1,
	.needs_tmpdir = 1,
	.setup = setup,
	.cleanup = cleanup,
	.test = run_test,
	.hugepages = {NR_HUGEPAGES, TST_NEEDS},
};