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.
Cc: Gerd Hoffmann <kraxel@xxxxxxxxxx>
Cc: Steve Sistare <steven.sistare@xxxxxxxxxx>
Cc: Muchun Song <muchun.song@xxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Vivek Kasireddy <vivek.kasireddy@xxxxxxxxx>
---
.../selftests/drivers/dma-buf/udmabuf.c | 20 ++++++++++++++++++-
1 file changed, 19 insertions(+), 1 deletion(-)
diff --git a/tools/testing/selftests/drivers/dma-buf/udmabuf.c b/tools/testing/selftests/drivers/dma-buf/udmabuf.c
index 6062723a172e..77aa2897e79f 100644
--- a/tools/testing/selftests/drivers/dma-buf/udmabuf.c
+++ b/tools/testing/selftests/drivers/dma-buf/udmabuf.c
@@ -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);
--
2.47.1
