[Intel-gfx] [PATCH 08/62] drm/i915/gt: Simplify virtual engine handling for execlists_hold()

[Matthew Auld]

On Wed, 23 Dec 2020 at 11:12, Chris Wilson <chris at chris-wilson.co.uk> wrote:
>
> Now that the tasklet completely controls scheduling of the requests, and
> we postpone scheduling out the old requests, we can keep a hanging
> virtual request bound to the engine on which it hung, and remove it from
> te queue. On release, it will be returned to the same engine and remain
> in its queue until it is scheduled; after which point it will become
> eligible for transfer to a sibling. Instead, we could opt to resubmit the
> request along the virtual engine on unhold, making it eligible for load
> balancing immediately -- but that seems like a pointless optimisation
> for a hanging context.
>
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Reviewed-by: Matthew Auld <matthew.auld at intel.com>