[PATCH 2/2] drm/ttm: remove ttm_bo_validate_swapout test

[Matthew Brost]

On Thu, Jul 10, 2025 at 04:41:29PM +0200, Christian König wrote:
> The test is quite fragile since it tries to allocate halve available system
> memory + 1 page.
> 
> If the system has either not enough memory to make the allocation work
> with other things running in parallel or to much memory so the allocation
> fails as to large/invalid the test won't fail.
> 
> Completely remove the test. We already validate swapout on the device
> level and that test seems to be stable.
> 
> Signed-off-by: Christian König <christian.koenig at amd.com>

Reviewed-by: Matthew Brost <matthew.brost at intel.com>

The first patch in series in nowhere to be found in my inbox, but feel
free to add RB to that patch as well.

Matt 

> ---
>  .../gpu/drm/ttm/tests/ttm_bo_validate_test.c  | 51 -------------------
>  1 file changed, 51 deletions(-)
> 
> diff --git a/drivers/gpu/drm/ttm/tests/ttm_bo_validate_test.c b/drivers/gpu/drm/ttm/tests/ttm_bo_validate_test.c
> index 38f476787302..1bcc67977f48 100644
> --- a/drivers/gpu/drm/ttm/tests/ttm_bo_validate_test.c
> +++ b/drivers/gpu/drm/ttm/tests/ttm_bo_validate_test.c
> @@ -758,56 +758,6 @@ static void ttm_bo_validate_move_fence_not_signaled(struct kunit *test)
>  	ttm_mock_manager_fini(priv->ttm_dev, snd_mem);
>  }
>  
> -static void ttm_bo_validate_swapout(struct kunit *test)
> -{
> -	unsigned long size_big, size = ALIGN(BO_SIZE, PAGE_SIZE);
> -	enum ttm_bo_type bo_type = ttm_bo_type_device;
> -	struct ttm_buffer_object *bo_small, *bo_big;
> -	struct ttm_test_devices *priv = test->priv;
> -	struct ttm_operation_ctx ctx = { };
> -	struct ttm_placement *placement;
> -	u32 mem_type = TTM_PL_TT;
> -	struct ttm_place *place;
> -	struct sysinfo si;
> -	int err;
> -
> -	si_meminfo(&si);
> -	size_big = ALIGN(((u64)si.totalram * si.mem_unit / 2), PAGE_SIZE);
> -
> -	ttm_mock_manager_init(priv->ttm_dev, mem_type, size_big + size);
> -
> -	place = ttm_place_kunit_init(test, mem_type, 0);
> -	placement = ttm_placement_kunit_init(test, place, 1);
> -
> -	bo_small = kunit_kzalloc(test, sizeof(*bo_small), GFP_KERNEL);
> -	KUNIT_ASSERT_NOT_NULL(test, bo_small);
> -
> -	drm_gem_private_object_init(priv->drm, &bo_small->base, size);
> -
> -	err = ttm_bo_init_reserved(priv->ttm_dev, bo_small, bo_type, placement,
> -				   PAGE_SIZE, &ctx, NULL, NULL,
> -				   &dummy_ttm_bo_destroy);
> -	KUNIT_EXPECT_EQ(test, err, 0);
> -	dma_resv_unlock(bo_small->base.resv);
> -
> -	bo_big = ttm_bo_kunit_init(test, priv, size_big, NULL);
> -
> -	dma_resv_lock(bo_big->base.resv, NULL);
> -	err = ttm_bo_validate(bo_big, placement, &ctx);
> -	dma_resv_unlock(bo_big->base.resv);
> -
> -	KUNIT_EXPECT_EQ(test, err, 0);
> -	KUNIT_EXPECT_NOT_NULL(test, bo_big->resource);
> -	KUNIT_EXPECT_EQ(test, bo_big->resource->mem_type, mem_type);
> -	KUNIT_EXPECT_EQ(test, bo_small->resource->mem_type, TTM_PL_SYSTEM);
> -	KUNIT_EXPECT_TRUE(test, bo_small->ttm->page_flags & TTM_TT_FLAG_SWAPPED);
> -
> -	ttm_bo_put(bo_big);
> -	ttm_bo_put(bo_small);
> -
> -	ttm_mock_manager_fini(priv->ttm_dev, mem_type);
> -}
> -
>  static void ttm_bo_validate_happy_evict(struct kunit *test)
>  {
>  	u32 mem_type = TTM_PL_VRAM, mem_multihop = TTM_PL_TT,
> @@ -1202,7 +1152,6 @@ static struct kunit_case ttm_bo_validate_test_cases[] = {
>  	KUNIT_CASE(ttm_bo_validate_move_fence_signaled),
>  	KUNIT_CASE_PARAM(ttm_bo_validate_move_fence_not_signaled,
>  			 ttm_bo_validate_wait_gen_params),
> -	KUNIT_CASE(ttm_bo_validate_swapout),
>  	KUNIT_CASE(ttm_bo_validate_happy_evict),
>  	KUNIT_CASE(ttm_bo_validate_all_pinned_evict),
>  	KUNIT_CASE(ttm_bo_validate_allowed_only_evict),
> -- 
> 2.34.1
>