[PATCH 2/2] drm/i915/buddy: sanity check the size

[Das, Nirmoy]

|Reviewed-by: Nirmoy Das <nirmoy.das at intel.com>|

On 4/7/2022 1:06 PM, Matthew Auld wrote:
> Ensure we check that the size is compatible with the requested
> page_size. For tiny objects that are automatically annotated with
> TTM_PL_FLAG_CONTIGUOUS(since they fit within a single page), we
> currently end up silently overriding the min_page_size, which ends up
> hiding bugs elsewhere.
>
> Signed-off-by: Matthew Auld<matthew.auld at intel.com>
> Cc: Thomas Hellström<thomas.hellstrom at linux.intel.com>
> Cc: Nirmoy Das<nirmoy.das at linux.intel.com>
> ---
>   drivers/gpu/drm/i915/i915_ttm_buddy_manager.c | 1 +
>   1 file changed, 1 insertion(+)
>
> diff --git a/drivers/gpu/drm/i915/i915_ttm_buddy_manager.c b/drivers/gpu/drm/i915/i915_ttm_buddy_manager.c
> index 8e4e3f72c1ef..a5109548abc0 100644
> --- a/drivers/gpu/drm/i915/i915_ttm_buddy_manager.c
> +++ b/drivers/gpu/drm/i915/i915_ttm_buddy_manager.c
> @@ -70,6 +70,7 @@ static int i915_ttm_buddy_man_alloc(struct ttm_resource_manager *man,
>   		min_page_size = bo->page_alignment << PAGE_SHIFT;
>   
>   	GEM_BUG_ON(min_page_size < mm->chunk_size);
> +	GEM_BUG_ON(!IS_ALIGNED(size, min_page_size));
>   
>   	if (place->fpfn + bman_res->base.num_pages != place->lpfn &&
>   	    place->flags & TTM_PL_FLAG_CONTIGUOUS) {
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