tools/testing/selftests/drivers/dma-buf/udmabuf.c

Source file repositories/reference/linux-study-clean/tools/testing/selftests/drivers/dma-buf/udmabuf.c

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/drivers/dma-buf/udmabuf.c
Extension
.c
Size
6996 bytes
Lines
278
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

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(7);

	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);

Annotation

Implementation Notes