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// SPDX-License-Identifier: GPL-2.0
/* Test selecting other page sizes for mmap/shmget. */
#define _GNU_SOURCE
#include <sys/mman.h>
#include <linux/mman.h>
#include <stdlib.h>
#include <stdio.h>
#include <sys/ipc.h>
#include <sys/shm.h>
#include <sys/stat.h>
#include <unistd.h>
#include <stdarg.h>
#include <string.h>
#include "vm_util.h"
#include "kselftest.h"
#include "hugepage_settings.h"
#if !defined(MAP_HUGETLB)
#define MAP_HUGETLB 0x40000
#endif
#define SHM_HUGETLB 04000 /* segment will use huge TLB pages */
#ifndef SHM_HUGE_SHIFT
#define SHM_HUGE_SHIFT 26
#endif
#define NUM_PAGESIZES 5
#define NUM_PAGES 4
unsigned long page_sizes[NUM_PAGESIZES];
int num_page_sizes;
int ilog2(unsigned long v)
{
int l = 0;
while ((1UL << l) < v)
l++;
return l;
}
void show(unsigned long ps)
{
if (ps == getpagesize())
return;
ksft_print_msg("%luMB: %lu\n", ps >> 20, hugetlb_free_pages(ps));
}
void test_mmap(unsigned long size, unsigned flags)
{
char *map;
unsigned long before, after;
before = hugetlb_free_pages(size);
map = mmap(NULL, size*NUM_PAGES, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_ANONYMOUS|MAP_HUGETLB|flags, -1, 0);
if (map == MAP_FAILED)
ksft_exit_fail_msg("mmap: %s\n", strerror(errno));
memset(map, 0xff, size*NUM_PAGES);
after = hugetlb_free_pages(size);
show(size);
ksft_test_result(size == getpagesize() || (before - after) == NUM_PAGES,
"%s mmap %lu %x\n", __func__, size, flags);
if (munmap(map, size * NUM_PAGES))
ksft_exit_fail_msg("%s: unmap %s\n", __func__, strerror(errno));
}
void test_shmget(unsigned long size, unsigned flags)
{
/* values for PAGE_SIZE test */
unsigned long before = NUM_PAGES;
unsigned long after = 0;
struct shm_info i;
char *map;
int id;
if (size != getpagesize())
before = hugetlb_free_pages(size);
id = shmget(IPC_PRIVATE, size * NUM_PAGES, IPC_CREAT|0600|flags);
if (id < 0) {
if (errno == EPERM) {
ksft_test_result_skip("shmget requires root privileges: %s\n",
strerror(errno));
return;
}
ksft_exit_fail_msg("shmget: %s\n", strerror(errno));
}
if (shmctl(id, SHM_INFO, (void *)&i) < 0)
ksft_exit_fail_msg("shmctl: %s\n", strerror(errno));
map = shmat(id, NULL, 0600);
if (map == MAP_FAILED)
ksft_exit_fail_msg("shmat: %s\n", strerror(errno));
shmctl(id, IPC_RMID, NULL);
memset(map, 0xff, size*NUM_PAGES);
if (size != getpagesize())
after = hugetlb_free_pages(size);
show(size);
ksft_test_result((before - after) == NUM_PAGES,
"%s: mmap %lu %x\n", __func__, size, flags);
if (shmdt(map))
ksft_exit_fail_msg("%s: shmdt: %s\n", __func__, strerror(errno));
}
void find_pagesizes(void)
{
unsigned long largest = getpagesize();
int i;
num_page_sizes = hugetlb_setup(NUM_PAGES, page_sizes, ARRAY_SIZE(page_sizes));
for (i = 0; i < num_page_sizes; i++)
if (page_sizes[i] > largest)
largest = page_sizes[i];
shm_limits_prepare(NUM_PAGES * largest);
}
int main(void)
{
unsigned default_hps = default_huge_page_size();
int i;
ksft_print_header();
find_pagesizes();
if (!num_page_sizes)
ksft_finished();
ksft_set_plan(2 * num_page_sizes + 3);
for (i = 0; i < num_page_sizes; i++) {
unsigned long ps = page_sizes[i];
int arg = ilog2(ps) << MAP_HUGE_SHIFT;
ksft_print_msg("Testing %luMB mmap with shift %x\n", ps >> 20, arg);
test_mmap(ps, MAP_HUGETLB | arg);
}
ksft_print_msg("Testing default huge mmap\n");
test_mmap(default_hps, MAP_HUGETLB);
ksft_print_msg("Testing non-huge shmget\n");
test_shmget(getpagesize(), 0);
for (i = 0; i < num_page_sizes; i++) {
unsigned long ps = page_sizes[i];
int arg = ilog2(ps) << SHM_HUGE_SHIFT;
ksft_print_msg("Testing %luMB shmget with shift %x\n", ps >> 20, arg);
test_shmget(ps, SHM_HUGETLB | arg);
}
ksft_print_msg("default huge shmget\n");
test_shmget(default_hps, SHM_HUGETLB);
ksft_finished();
}
SHM_LIMITS_RESTORE()
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