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selftests/mm: gup_longterm: add liburing tests

Browse source 
Similar to the COW selftests, also use io_uring fixed buffers to test if
long-term page pinning works as expected.

Link: https://lkml.kernel.org/r/20230519102723.185721-4-david@redhat.com
Signed-off-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Lorenzo Stoakes <lstoakes@gmail.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Jason Gunthorpe <jgg@nvidia.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Peter Xu <peterx@redhat.com>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
David Hildenbrand 2023-05-19 12:27:23 +02:00 committed by Andrew Morton
parent c879462a08
commit 89207c669b
1 changed files with 73 additions and 0 deletions
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73
tools/testing/selftests/mm/gup_longterm.c
View file

@ -22,6 +22,9 @@
#include <linux/memfd.h>
#include "local_config.h"
#ifdef LOCAL_CONFIG_HAVE_LIBURING
#include <liburing.h>
#endif /* LOCAL_CONFIG_HAVE_LIBURING */
#include "../../../../mm/gup_test.h"
#include "../kselftest.h"
@ -80,6 +83,9 @@ enum test_type {
TEST_TYPE_RO_FAST,
TEST_TYPE_RW,
TEST_TYPE_RW_FAST,
#ifdef LOCAL_CONFIG_HAVE_LIBURING
TEST_TYPE_IOURING,
#endif /* LOCAL_CONFIG_HAVE_LIBURING */
};
static void do_test(int fd, size_t size, enum test_type type, bool shared)
@ -173,6 +179,51 @@ static void do_test(int fd, size_t size, enum test_type type, bool shared)
ksft_test_result(should_work, "Should have worked\n");
break;
}
#ifdef LOCAL_CONFIG_HAVE_LIBURING
case TEST_TYPE_IOURING: {
struct io_uring ring;
struct iovec iov;
/* io_uring always pins pages writable. */
if (shared && fs_is_unknown(fs_type)) {
ksft_test_result_skip("Unknown filesystem\n");
return;
}
should_work = !shared ||
fs_supports_writable_longterm_pinning(fs_type);
/* Skip on errors, as we might just lack kernel support. */
ret = io_uring_queue_init(1, &ring, 0);
if (ret < 0) {
ksft_test_result_skip("io_uring_queue_init() failed\n");
break;
}
/*
* Register the range as a fixed buffer. This will FOLL_WRITE |
* FOLL_PIN | FOLL_LONGTERM the range.
*/
iov.iov_base = mem;
iov.iov_len = size;
ret = io_uring_register_buffers(&ring, &iov, 1);
/* Only new kernels return EFAULT. */
if (ret && (errno == ENOSPC || errno == EOPNOTSUPP ||
errno == EFAULT)) {
ksft_test_result(!should_work, "Should have failed\n");
} else if (ret) {
/*
* We might just lack support or have insufficient
* MEMLOCK limits.
*/
ksft_test_result_skip("io_uring_register_buffers() failed\n");
} else {
ksft_test_result(should_work, "Should have worked\n");
io_uring_unregister_buffers(&ring);
}
io_uring_queue_exit(&ring);
break;
}
#endif /* LOCAL_CONFIG_HAVE_LIBURING */
default:
assert(false);
}
@ -310,6 +361,18 @@ static void test_private_ro_fast_pin(int fd, size_t size)
do_test(fd, size, TEST_TYPE_RO_FAST, false);
}
#ifdef LOCAL_CONFIG_HAVE_LIBURING
static void test_shared_iouring(int fd, size_t size)
{
do_test(fd, size, TEST_TYPE_IOURING, true);
}
static void test_private_iouring(int fd, size_t size)
{
do_test(fd, size, TEST_TYPE_IOURING, false);
}
#endif /* LOCAL_CONFIG_HAVE_LIBURING */
static const struct test_case test_cases[] = {
{
"R/W longterm GUP pin in MAP_SHARED file mapping",
@ -343,6 +406,16 @@ static const struct test_case test_cases[] = {
"R/O longterm GUP-fast pin in MAP_PRIVATE file mapping",
test_private_ro_fast_pin,
},
#ifdef LOCAL_CONFIG_HAVE_LIBURING
{
"io_uring fixed buffer with MAP_SHARED file mapping",
test_shared_iouring,
},
{
"io_uring fixed buffer with MAP_PRIVATE file mapping",
test_private_iouring,
},
#endif /* LOCAL_CONFIG_HAVE_LIBURING */
};
static void run_test_case(struct test_case const *test_case)