MIRRORS/linux-yocto
1
0
Fork 0
mirror of git://git.yoctoproject.org/linux-yocto.git synced 2026-01-27 12:47:24 +01:00
Code Issues Actions Packages Projects Releases Wiki Activity

selftests/udmabuf: add a test to pin first before writing to memfd

Browse Source 
Unlike the existing tests, this new test will create a memfd (backed by
hugetlb) and pin the folios in it (a small subset) before writing/
populating it with data.  This is a valid use-case that invokes the
memfd_alloc_folio() kernel API and is expected to work unless there aren't
enough hugetlb folios to satisfy the allocation needs.

Link: https://lkml.kernel.org/r/20250618053415.1036185-4-vivek.kasireddy@intel.com
Signed-off-by: Vivek Kasireddy <vivek.kasireddy@intel.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Steve Sistare <steven.sistare@oracle.com>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: David Hildenbrand <david@redhat.com>
Cc: Oscar Salvador <osalvador@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Vivek Kasireddy 2025-06-17 22:30:55 -07:00 committed by Andrew Morton
parent 717cf93573
commit cf34cfbf17
1 changed files with 19 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
tools/testing/selftests/drivers/dma-buf/udmabuf.c
View File

@ -138,7 +138,7 @@ int main(int argc, char *argv[])
void *addr1, *addr2;
ksft_print_header();
ksft_set_plan(6);
ksft_set_plan(7);
devfd = open("/dev/udmabuf", O_RDWR);
if (devfd < 0) {
@ -248,6 +248,24 @@ int main(int argc, char *argv[])
else
ksft_test_result_pass("%s: [PASS,test-6]\n", TEST_PREFIX);
close(buf);
close(memfd);
/* same test as above but we pin first before writing to memfd */
page_size = getpagesize() * 512; /* 2 MB */
size = MEMFD_SIZE * page_size;
memfd = create_memfd_with_seals(size, true);
buf = create_udmabuf_list(devfd, memfd, size);
addr2 = mmap_fd(buf, NUM_PAGES * NUM_ENTRIES * getpagesize());
addr1 = mmap_fd(memfd, size);
write_to_memfd(addr1, size, 'a');
write_to_memfd(addr1, size, 'b');
ret = compare_chunks(addr1, addr2, size);
if (ret < 0)
ksft_test_result_fail("%s: [FAIL,test-7]\n", TEST_PREFIX);
else
ksft_test_result_pass("%s: [PASS,test-7]\n", TEST_PREFIX);
close(buf);
close(memfd);
close(devfd);