// SPDX-License-Identifier: GPL-2.0
#define _GNU_SOURCE
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <linux/magic.h>
#include <sys/mman.h>
#include <sys/statfs.h>
#include <errno.h>
#include <stdbool.h>
#include "../kselftest.h"
#define PREFIX " ... "
#define ERROR_PREFIX " !!! "
#define MAX_WRITE_READ_CHUNK_SIZE (getpagesize() * 16)
#define MAX(a, b) (((a) > (b)) ? (a) : (b))
enum test_status {
TEST_PASSED = 0,
TEST_FAILED = 1,
TEST_SKIPPED = 2,
};
static char *status_to_str(enum test_status status)
{
switch (status) {
case TEST_PASSED:
return "TEST_PASSED";
case TEST_FAILED:
return "TEST_FAILED";
case TEST_SKIPPED:
return "TEST_SKIPPED";
default:
return "TEST_???";
}
}
static int setup_filemap(char *filemap, size_t len, size_t wr_chunk_size)
{
char iter = 0;
for (size_t offset = 0; offset < len;
offset += wr_chunk_size) {
iter++;
memset(filemap + offset, iter, wr_chunk_size);
}
return 0;
}
static bool verify_chunk(char *buf, size_t len, char val)
{
size_t i;
for (i = 0; i < len; ++i) {
if (buf[i] != val) {
printf(PREFIX ERROR_PREFIX "check fail: buf[%lu] = %u != %u\n",
i, buf[i], val);
return false;
}
}
return true;
}
static bool seek_read_hugepage_filemap(int fd, size_t len, size_t wr_chunk_size,
off_t offset, size_t expected)
{
char buf[MAX_WRITE_READ_CHUNK_SIZE];
ssize_t ret_count = 0;
ssize_t total_ret_count = 0;
char val = offset / wr_chunk_size + offset % wr_chunk_size;
printf(PREFIX PREFIX "init val=%u with offset=0x%lx\n", val, offset);
printf(PREFIX PREFIX "expect to read 0x%lx bytes of data in total\n",
expected);
if (lseek(fd, offset, SEEK_SET) < 0) {
perror(PREFIX ERROR_PREFIX "seek failed");
return false;
}
while (offset + total_ret_count < len) {
ret_count = read(fd, buf, wr_chunk_size);
if (ret_count == 0) {
printf(PREFIX PREFIX "read reach end of the file\n");
break;
} else if (ret_count < 0) {
perror(PREFIX ERROR_PREFIX "read failed");
break;
}
++val;
if (!verify_chunk(buf, ret_count, val))
return false;
total_ret_count += ret_count;
}
printf(PREFIX PREFIX "actually read 0x%lx bytes of data in total\n",
total_ret_count);
return total_ret_count == expected;
}
static bool read_hugepage_filemap(int fd, size_t len,
size_t wr_chunk_size, size_t expected)
{
char buf[MAX_WRITE_READ_CHUNK_SIZE];
ssize_t ret_count = 0;
ssize_t total_ret_count = 0;
char val = 0;
printf(PREFIX PREFIX "expect to read 0x%lx bytes of data in total\n",
expected);
while (total_ret_count < len) {
ret_count = read(fd, buf, wr_chunk_size);
if (ret_count == 0) {
printf(PREFIX PREFIX "read reach end of the file\n");
break;
} else if (ret_count < 0) {
perror(PREFIX ERROR_PREFIX "read failed");
break;
}
++val;
if (!verify_chunk(buf, ret_count, val))
return false;
total_ret_count += ret_count;
}
printf(PREFIX PREFIX "actually read 0x%lx bytes of data in total\n",
total_ret_count);
return total_ret_count == expected;
}
static enum test_status
test_hugetlb_read(int fd, size_t len, size_t wr_chunk_size)
{
enum test_status status = TEST_SKIPPED;
char *filemap = NULL;
if (ftruncate(fd, len) < 0) {
perror(PREFIX ERROR_PREFIX "ftruncate failed");
return status;
}
filemap = mmap(NULL, len, PROT_READ | PROT_WRITE,
MAP_SHARED | MAP_POPULATE, fd, 0);
if (filemap == MAP_FAILED) {
perror(PREFIX ERROR_PREFIX "mmap for primary mapping failed");
goto done;
}
setup_filemap(filemap, len, wr_chunk_size);
status = TEST_FAILED;
if (read_hugepage_filemap(fd, len, wr_chunk_size, len))
status = TEST_PASSED;
munmap(filemap, len);
done:
if (ftruncate(fd, 0) < 0) {
perror(PREFIX ERROR_PREFIX "ftruncate back to 0 failed");
status = TEST_FAILED;
}
return status;
}
static enum test_status
test_hugetlb_read_hwpoison(int fd, size_t len, size_t wr_chunk_size,
bool skip_hwpoison_page)
{
enum test_status status = TEST_SKIPPED;
char *filemap = NULL;
char *hwp_addr = NULL;
const unsigned long pagesize = getpagesize();
if (ftruncate(fd, len) < 0) {
perror(PREFIX ERROR_PREFIX "ftruncate failed");
return status;
}
filemap = mmap(NULL, len, PROT_READ | PROT_WRITE,
MAP_SHARED | MAP_POPULATE, fd, 0);
if (filemap == MAP_FAILED) {
perror(PREFIX ERROR_PREFIX "mmap for primary mapping failed");
goto done;
}
setup_filemap(filemap, len, wr_chunk_size);
status = TEST_FAILED;
/*
* Poisoned hugetlb page layout (assume hugepagesize=2MB):
* |<---------------------- 1MB ---------------------->|
* |<---- healthy page ---->|<---- HWPOISON page ----->|
* |<------------------- (1MB - 8KB) ----------------->|
*/
hwp_addr = filemap + len / 2 + pagesize;
if (madvise(hwp_addr, pagesize, MADV_HWPOISON) < 0) {
perror(PREFIX ERROR_PREFIX "MADV_HWPOISON failed");
goto unmap;
}
if (!skip_hwpoison_page) {
/*
* Userspace should be able to read (1MB + 1 page) from
* the beginning of the HWPOISONed hugepage.
*/
if (read_hugepage_filemap(fd, len, wr_chunk_size,
len / 2 + pagesize))
status = TEST_PASSED;
} else {
/*
* Userspace should be able to read (1MB - 2 pages) from
* HWPOISONed hugepage.
*/
if (seek_read_hugepage_filemap(fd, len, wr_chunk_size,
len / 2 + MAX(2 * pagesize, wr_chunk_size),
len / 2 - MAX(2 * pagesize, wr_chunk_size)))
status = TEST_PASSED;
}
unmap:
munmap(filemap, len);
done:
if (ftruncate(fd, 0) < 0) {
perror(PREFIX ERROR_PREFIX "ftruncate back to 0 failed");
status = TEST_FAILED;
}
return status;
}
static int create_hugetlbfs_file(struct statfs *file_stat)
{
int fd;
fd = memfd_create("hugetlb_tmp", MFD_HUGETLB);
if (fd < 0) {
perror(PREFIX ERROR_PREFIX "could not open hugetlbfs file");
return -1;
}
memset(file_stat, 0, sizeof(*file_stat));
if (fstatfs(fd, file_stat)) {
perror(PREFIX ERROR_PREFIX "fstatfs failed");
goto close;
}
if (file_stat->f_type != HUGETLBFS_MAGIC) {
printf(PREFIX ERROR_PREFIX "not hugetlbfs file\n");
goto close;
}
return fd;
close:
close(fd);
return -1;
}
int main(void)
{
int fd;
struct statfs file_stat;
enum test_status status;
/* Test read() in different granularity. */
size_t wr_chunk_sizes[] = {
getpagesize() / 2, getpagesize(),
getpagesize() * 2, getpagesize() * 4
};
size_t i;
for (i = 0; i < ARRAY_SIZE(wr_chunk_sizes); ++i) {
printf("Write/read chunk size=0x%lx\n",
wr_chunk_sizes[i]);
fd = create_hugetlbfs_file(&file_stat);
if (fd < 0)
goto create_failure;
printf(PREFIX "HugeTLB read regression test...\n");
status = test_hugetlb_read(fd, file_stat.f_bsize,
wr_chunk_sizes[i]);
printf(PREFIX "HugeTLB read regression test...%s\n",
status_to_str(status));
close(fd);
if (status == TEST_FAILED)
return -1;
fd = create_hugetlbfs_file(&file_stat);
if (fd < 0)
goto create_failure;
printf(PREFIX "HugeTLB read HWPOISON test...\n");
status = test_hugetlb_read_hwpoison(fd, file_stat.f_bsize,
wr_chunk_sizes[i], false);
printf(PREFIX "HugeTLB read HWPOISON test...%s\n",
status_to_str(status));
close(fd);
if (status == TEST_FAILED)
return -1;
fd = create_hugetlbfs_file(&file_stat);
if (fd < 0)
goto create_failure;
printf(PREFIX "HugeTLB seek then read HWPOISON test...\n");
status = test_hugetlb_read_hwpoison(fd, file_stat.f_bsize,
wr_chunk_sizes[i], true);
printf(PREFIX "HugeTLB seek then read HWPOISON test...%s\n",
status_to_str(status));
close(fd);
if (status == TEST_FAILED)
return -1;
}
return 0;
create_failure:
printf(ERROR_PREFIX "Abort test: failed to create hugetlbfs file\n");
return -1;
}
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