[Intel-gfx] [PATCH v3] drm: add a check to verify the size alignment

[Matthew Auld]

On 11/04/2022 08:38, Arunpravin Paneer Selvam wrote:
> Add a simple check to reject any size not aligned to the
> min_page_size.
> 
> when size is not aligned to min_page_size, driver module
> should handle in their own way either to round_up() the
> size value to min_page_size or just to enable WARN_ON().
> 
> If we dont handle the alignment properly, we may hit the
> following bug, Unigine Heaven has allocation requests for
> example required pages are 257 and alignment request is 256.
> To allocate the left over 1 page, continues the iteration to
> find the order value which is 0 and when it compares with
> min_order = 8, triggers the BUG_ON(order < min_order).
> 
> v2: add more commit description
> v3: remove WARN_ON()
> 
> Signed-off-by: Arunpravin Paneer Selvam <Arunpravin.PaneerSelvam at amd.com>
> Suggested-by: Matthew Auld <matthew.auld at intel.com>
Reviewed-by: Matthew Auld <matthew.auld at intel.com>