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// SPDX-License-Identifier: GPL-2.0
#define _GNU_SOURCE
#define __EXPORTED_HEADERS__
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <malloc.h>
#include <stdbool.h>
#include <sys/ioctl.h>
#include <sys/syscall.h>
#include <sys/mman.h>
#include <linux/memfd.h>
#include <linux/udmabuf.h>
#include "../../kselftest.h"
#define TEST_PREFIX "drivers/dma-buf/udmabuf"
#define NUM_PAGES 4
#define NUM_ENTRIES 4
#define MEMFD_SIZE 1024 /* in pages */
static unsigned int page_size;
static int create_memfd_with_seals(off64_t size, bool hpage)
{
int memfd, ret;
unsigned int flags = MFD_ALLOW_SEALING;
if (hpage)
flags |= MFD_HUGETLB;
memfd = memfd_create("udmabuf-test", flags);
if (memfd < 0) {
ksft_print_msg("%s: [skip,no-memfd]\n", TEST_PREFIX);
exit(KSFT_SKIP);
}
ret = fcntl(memfd, F_ADD_SEALS, F_SEAL_SHRINK);
if (ret < 0) {
ksft_print_msg("%s: [skip,fcntl-add-seals]\n", TEST_PREFIX);
exit(KSFT_SKIP);
}
ret = ftruncate(memfd, size);
if (ret == -1) {
ksft_print_msg("%s: [FAIL,memfd-truncate]\n", TEST_PREFIX);
exit(KSFT_FAIL);
}
return memfd;
}
static int create_udmabuf_list(int devfd, int memfd, off64_t memfd_size)
{
struct udmabuf_create_list *list;
int ubuf_fd, i;
list = malloc(sizeof(struct udmabuf_create_list) +
sizeof(struct udmabuf_create_item) * NUM_ENTRIES);
if (!list) {
ksft_print_msg("%s: [FAIL, udmabuf-malloc]\n", TEST_PREFIX);
exit(KSFT_FAIL);
}
for (i = 0; i < NUM_ENTRIES; i++) {
list->list[i].memfd = memfd;
list->list[i].offset = i * (memfd_size / NUM_ENTRIES);
list->list[i].size = getpagesize() * NUM_PAGES;
}
list->count = NUM_ENTRIES;
list->flags = UDMABUF_FLAGS_CLOEXEC;
ubuf_fd = ioctl(devfd, UDMABUF_CREATE_LIST, list);
free(list);
if (ubuf_fd < 0) {
ksft_print_msg("%s: [FAIL, udmabuf-create]\n", TEST_PREFIX);
exit(KSFT_FAIL);
}
return ubuf_fd;
}
static void write_to_memfd(void *addr, off64_t size, char chr)
{
int i;
for (i = 0; i < size / page_size; i++) {
*((char *)addr + (i * page_size)) = chr;
}
}
static void *mmap_fd(int fd, off64_t size)
{
void *addr;
addr = mmap(NULL, size, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
if (addr == MAP_FAILED) {
ksft_print_msg("%s: ubuf_fd mmap fail\n", TEST_PREFIX);
exit(KSFT_FAIL);
}
return addr;
}
static int compare_chunks(void *addr1, void *addr2, off64_t memfd_size)
{
off64_t off;
int i = 0, j, k = 0, ret = 0;
char char1, char2;
while (i < NUM_ENTRIES) {
off = i * (memfd_size / NUM_ENTRIES);
for (j = 0; j < NUM_PAGES; j++, k++) {
char1 = *((char *)addr1 + off + (j * getpagesize()));
char2 = *((char *)addr2 + (k * getpagesize()));
if (char1 != char2) {
ret = -1;
goto err;
}
}
i++;
}
err:
munmap(addr1, memfd_size);
munmap(addr2, NUM_ENTRIES * NUM_PAGES * getpagesize());
return ret;
}
int main(int argc, char *argv[])
{
struct udmabuf_create create;
int devfd, memfd, buf, ret;
off64_t size;
void *addr1, *addr2;
ksft_print_header();
ksft_set_plan(6);
devfd = open("/dev/udmabuf", O_RDWR);
if (devfd < 0) {
ksft_print_msg(
"%s: [skip,no-udmabuf: Unable to access DMA buffer device file]\n",
TEST_PREFIX);
exit(KSFT_SKIP);
}
memfd = memfd_create("udmabuf-test", MFD_ALLOW_SEALING);
if (memfd < 0) {
ksft_print_msg("%s: [skip,no-memfd]\n", TEST_PREFIX);
exit(KSFT_SKIP);
}
ret = fcntl(memfd, F_ADD_SEALS, F_SEAL_SHRINK);
if (ret < 0) {
ksft_print_msg("%s: [skip,fcntl-add-seals]\n", TEST_PREFIX);
exit(KSFT_SKIP);
}
size = getpagesize() * NUM_PAGES;
ret = ftruncate(memfd, size);
if (ret == -1) {
ksft_print_msg("%s: [FAIL,memfd-truncate]\n", TEST_PREFIX);
exit(KSFT_FAIL);
}
memset(&create, 0, sizeof(create));
/* should fail (offset not page aligned) */
create.memfd = memfd;
create.offset = getpagesize()/2;
create.size = getpagesize();
buf = ioctl(devfd, UDMABUF_CREATE, &create);
if (buf >= 0)
ksft_test_result_fail("%s: [FAIL,test-1]\n", TEST_PREFIX);
else
ksft_test_result_pass("%s: [PASS,test-1]\n", TEST_PREFIX);
/* should fail (size not multiple of page) */
create.memfd = memfd;
create.offset = 0;
create.size = getpagesize()/2;
buf = ioctl(devfd, UDMABUF_CREATE, &create);
if (buf >= 0)
ksft_test_result_fail("%s: [FAIL,test-2]\n", TEST_PREFIX);
else
ksft_test_result_pass("%s: [PASS,test-2]\n", TEST_PREFIX);
/* should fail (not memfd) */
create.memfd = 0; /* stdin */
create.offset = 0;
create.size = size;
buf = ioctl(devfd, UDMABUF_CREATE, &create);
if (buf >= 0)
ksft_test_result_fail("%s: [FAIL,test-3]\n", TEST_PREFIX);
else
ksft_test_result_pass("%s: [PASS,test-3]\n", TEST_PREFIX);
/* should work */
page_size = getpagesize();
addr1 = mmap_fd(memfd, size);
write_to_memfd(addr1, size, 'a');
create.memfd = memfd;
create.offset = 0;
create.size = size;
buf = ioctl(devfd, UDMABUF_CREATE, &create);
if (buf < 0)
ksft_test_result_fail("%s: [FAIL,test-4]\n", TEST_PREFIX);
else
ksft_test_result_pass("%s: [PASS,test-4]\n", TEST_PREFIX);
munmap(addr1, size);
close(buf);
close(memfd);
/* should work (migration of 4k size pages)*/
size = MEMFD_SIZE * page_size;
memfd = create_memfd_with_seals(size, false);
addr1 = mmap_fd(memfd, size);
write_to_memfd(addr1, size, 'a');
buf = create_udmabuf_list(devfd, memfd, size);
addr2 = mmap_fd(buf, NUM_PAGES * NUM_ENTRIES * getpagesize());
write_to_memfd(addr1, size, 'b');
ret = compare_chunks(addr1, addr2, size);
if (ret < 0)
ksft_test_result_fail("%s: [FAIL,test-5]\n", TEST_PREFIX);
else
ksft_test_result_pass("%s: [PASS,test-5]\n", TEST_PREFIX);
close(buf);
close(memfd);
/* should work (migration of 2MB size huge pages)*/
page_size = getpagesize() * 512; /* 2 MB */
size = MEMFD_SIZE * page_size;
memfd = create_memfd_with_seals(size, true);
addr1 = mmap_fd(memfd, size);
write_to_memfd(addr1, size, 'a');
buf = create_udmabuf_list(devfd, memfd, size);
addr2 = mmap_fd(buf, NUM_PAGES * NUM_ENTRIES * getpagesize());
write_to_memfd(addr1, size, 'b');
ret = compare_chunks(addr1, addr2, size);
if (ret < 0)
ksft_test_result_fail("%s: [FAIL,test-6]\n", TEST_PREFIX);
else
ksft_test_result_pass("%s: [PASS,test-6]\n", TEST_PREFIX);
close(buf);
close(memfd);
close(devfd);
ksft_print_msg("%s: ok\n", TEST_PREFIX);
ksft_print_cnts();
return 0;
}
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