[Intel-gfx] [PATCH v4 4/6] drm/i915/ttm: Correctly handle waiting for gpu when shrinking

[Matthew Auld]

On 18/11/2021 13:02, Thomas Hellström wrote:
> With async migration, the shrinker may end up wanting to release the
> pages of an object while the migration blit is still running, since
> the GT migration code doesn't set up VMAs and the shrinker is thus
> oblivious to the fact that the GPU is still using the pages.
> 
> Add waiting for gpu in the shrinker_release_pages() op and an
> argument to that function indicating whether the shrinker expects it
> to not wait for gpu. In the latter case the shrinker_release_pages()
> op will return -EBUSY if the object is not idle.
> 
> Signed-off-by: Thomas Hellström <thomas.hellstrom at linux.intel.com>
Reviewed-by: Matthew Auld <matthew.auld at intel.com>