From: Dave Airlie <airlied@xxxxxxxxxx>
The test here creates an sg table, but never maps it, when
we get to drm_gem_shmem_free, the helper tries to unmap and this
causes warnings on some platforms and debug kernels.
For now, set the dma mask (to avoid swiotlb) and map the sgtable.
Fixes: 93032ae634d4 ("drm/test: add a test suite for GEM objects backed by shmem")
Cc: stable@xxxxxxxxxxxxxxx
---
drivers/gpu/drm/tests/drm_gem_shmem_test.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/drivers/gpu/drm/tests/drm_gem_shmem_test.c b/drivers/gpu/drm/tests/drm_gem_shmem_test.c
index 91202e40cde9..eb3a7a84be90 100644
--- a/drivers/gpu/drm/tests/drm_gem_shmem_test.c
+++ b/drivers/gpu/drm/tests/drm_gem_shmem_test.c
@@ -102,6 +102,17 @@ static void drm_gem_shmem_test_obj_create_private(struct kunit *test)
sg_init_one(sgt->sgl, buf, TEST_SIZE);
+ /*
+ * Set the DMA mask to 64-bits and map the sgtables
+ * otherwise drm_gem_shmem_free will cause a warning
+ * on debug kernels.
+ * */
+ ret = dma_set_mask(drm_dev->dev, DMA_BIT_MASK(64));
+ KUNIT_ASSERT_EQ(test, ret, 0);
+
+ ret = dma_map_sgtable(drm_dev->dev, sgt, DMA_BIDIRECTIONAL, 0);
+ KUNIT_ASSERT_EQ(test, ret, 0);
+
/* Init a mock DMA-BUF */
buf_mock.size = TEST_SIZE;
attach_mock.dmabuf = &buf_mock;
--
2.45.0
