[Intel-gfx] [PATCH] drm/i915: Check object_can_migrate from object_migrate

[Matthew Auld]

On Wed, 14 Jul 2021 at 21:45, Jason Ekstrand <jason at jlekstrand.net> wrote:
>
> We don't roll them together entirely because there are still a couple
> cases where we want a separate can_migrate check.  For instance, the
> display code checks that you can migrate a buffer to LMEM before it
> accepts it in fb_create.  The dma-buf import code also uses it to do an
> early check and return a different error code if someone tries to attach
> a LMEM-only dma-buf to another driver.
>
> However, no one actually wants to call object_migrate when can_migrate
> has failed.  The stated intention is for self-tests but none of those
> actually take advantage of this unsafe migration.
>
> Signed-off-by: Jason Ekstrand <jason at jlekstrand.net>
> Cc: Daniel Vetter <daniel at ffwll.ch>
> Cc: Matthew Auld <matthew.auld at intel.com>
Reviewed-by: Matthew Auld <matthew.auld at intel.com>