Add a new unit test case for buffer clearance issue during resume. Using a non-power-of-two mm size, allocate alternating blocks of 4KiB in an even sequence and free them as cleared. All alternate blocks should be marked as dirty and the split blocks should be merged back to their original size when the blocks clear reset function is called.
Signed-off-by: Arunpravin Paneer Selvam <[email protected]> Reviewed-by: Matthew Auld <[email protected]> --- v6: Standalone repost of patch 3/3 from series 151686; the other two patches are already applied. Rebased onto the gpu_buddy rename (drm_buddy_test.c -> gpu_buddy_test.c, drm_buddy_* -> gpu_buddy_*) and updated the subject accordingly. No functional change; kept Matthew's Reviewed-by as the port is mechanical. drivers/gpu/tests/gpu_buddy_test.c | 41 ++++++++++++++++++++++++++++++ 1 file changed, 41 insertions(+) diff --git a/drivers/gpu/tests/gpu_buddy_test.c b/drivers/gpu/tests/gpu_buddy_test.c index 7df5c2ae83bb..89698563c61b 100644 --- a/drivers/gpu/tests/gpu_buddy_test.c +++ b/drivers/gpu/tests/gpu_buddy_test.c @@ -1002,6 +1002,47 @@ static void gpu_test_buddy_alloc_clear(struct kunit *test) "buddy_alloc hit an error size=%lu\n", ps); gpu_buddy_free_list(&mm, &allocated, GPU_BUDDY_CLEARED); gpu_buddy_fini(&mm); + + /* + * Using a non-power-of-two mm size, allocate alternating blocks of 4KiB in an + * even sequence and free them as cleared. All blocks should be marked as + * dirty and the split blocks should be merged back to their original + * size when the blocks clear reset function is called. + */ + KUNIT_EXPECT_FALSE(test, gpu_buddy_init(&mm, mm_size, ps)); + KUNIT_EXPECT_EQ(test, mm.max_order, max_order); + + i = 0; + n_pages = mm_size / ps; + do { + if (i % 2 == 0) + KUNIT_ASSERT_FALSE_MSG(test, gpu_buddy_alloc_blocks(&mm, 0, mm_size, + ps, ps, &allocated, 0), + "buddy_alloc hit an error size=%lu\n", ps); + } while (++i < n_pages); + + gpu_buddy_free_list(&mm, &allocated, GPU_BUDDY_CLEARED); + gpu_buddy_reset_clear(&mm, false); + KUNIT_EXPECT_EQ(test, mm.clear_avail, 0); + + /* + * Using a non-power-of-two mm size, allocate alternating blocks of 4KiB in an + * odd sequence and free them as cleared. All blocks should be marked as + * cleared and the split blocks should be merged back to their original + * size when the blocks clear reset function is called. + */ + i = 0; + do { + if (i % 2 != 0) + KUNIT_ASSERT_FALSE_MSG(test, gpu_buddy_alloc_blocks(&mm, 0, mm_size, + ps, ps, &allocated, 0), + "buddy_alloc hit an error size=%lu\n", ps); + } while (++i < n_pages); + + gpu_buddy_free_list(&mm, &allocated, GPU_BUDDY_CLEARED); + gpu_buddy_reset_clear(&mm, true); + KUNIT_EXPECT_EQ(test, mm.clear_avail, mm_size); + gpu_buddy_fini(&mm); } static void gpu_test_buddy_alloc_contiguous(struct kunit *test) -- 2.34.1
