[PATCH] drm/i915: Do not share hwsp across contexts any more, v5.1

[Chris Wilson]

Quoting Maarten Lankhorst (2020-10-21 15:39:48)
> Instead of sharing pages with breadcrumbs, give each timeline a
> single page. This allows unrelated timelines not to share locks
> any more during command submission.

This is designed to fail. No. The hwsp is observed externally with a
lifetime outside of the local timeline's control.
-Chris