[PATCH i-g-t v2 1/2] tests/intel/xe_*: Use NEEDS_VISIBLE_VRAM flag where it's missing

[Matthew Auld]

On 16/06/2025 09:54, Lukasz Laguna wrote:
> Set DRM_XE_GEM_CREATE_FLAG_NEEDS_VISIBLE_VRAM flag when creating BOs
> that will be CPU-mapped, to ensure that the corresponding VRAM
> allocation will use the CPU accessible part of VRAM.
> 
> This is essential for small-bar systems, where omitting the flag may
> cause failures or SIGBUS crashes due to the CPU accessing non-visible
> VRAM.
> 
> Suggested-by: Matthew Auld <matthew.auld at intel.com>
> Signed-off-by: Lukasz Laguna <lukasz.laguna at intel.com>

Reviewed-by: Matthew Auld <matthew.auld at intel.com>

> ---
>   tests/intel/xe_pat.c        | 3 ++-
>   tests/intel/xe_spin_batch.c | 3 ++-
>   2 files changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/tests/intel/xe_pat.c b/tests/intel/xe_pat.c
> index 88d8de9dd..8bb0ac167 100644
> --- a/tests/intel/xe_pat.c
> +++ b/tests/intel/xe_pat.c
> @@ -582,7 +582,8 @@ static void prime_self_import_coh(void)
>   	fd1 = drm_open_driver(DRIVER_XE);
>   	fd2 = drm_open_driver(DRIVER_XE);
>   
> -	dst_handle = xe_bo_create_caching(fd1, 0, size, all_memory_regions(fd1), 0,
> +	dst_handle = xe_bo_create_caching(fd1, 0, size, all_memory_regions(fd1),
> +					  DRM_XE_GEM_CREATE_FLAG_NEEDS_VISIBLE_VRAM,
>   					  DRM_XE_GEM_CPU_CACHING_WC);
>   
>   	dma_buf_fd = prime_handle_to_fd(fd1, dst_handle);
> diff --git a/tests/intel/xe_spin_batch.c b/tests/intel/xe_spin_batch.c
> index 21b08ba06..48a888e35 100644
> --- a/tests/intel/xe_spin_batch.c
> +++ b/tests/intel/xe_spin_batch.c
> @@ -442,7 +442,8 @@ static void exec_store(int fd, struct drm_xe_engine_class_instance *eci,
>   	vm = xe_vm_create(fd, 0, 0);
>   	exec_queue = xe_exec_queue_create(fd, vm, eci, 0);
>   	bb_size = xe_bb_size(fd, sizeof(*data));
> -	bb = xe_bo_create(fd, vm, bb_size, vram_if_possible(fd, eci->gt_id), 0);
> +	bb = xe_bo_create(fd, vm, bb_size, vram_if_possible(fd, eci->gt_id),
> +			  DRM_XE_GEM_CREATE_FLAG_NEEDS_VISIBLE_VRAM);
>   	bb_addr = intel_allocator_alloc_with_strategy(ahnd, bb, bb_size, 0,
>   						      ALLOC_STRATEGY_LOW_TO_HIGH);
>   	data = xe_bo_map(fd, bb, bb_size);