[Intel-gfx] [PATCH 1/9] drm/i915: Ignore submit-fences on the same timeline

[Mika Kuoppala]

Chris Wilson <chris at chris-wilson.co.uk> writes:

> While we ordinarily do not skip submit-fences due to the accompanying
> hook that we want to callback on execution, a submit-fence on the same
> timeline is meaningless.
>
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> Cc: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
> ---
>  drivers/gpu/drm/i915/i915_request.c | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/i915_request.c b/drivers/gpu/drm/i915/i915_request.c
> index 589739bfee25..be2ce9065a29 100644
> --- a/drivers/gpu/drm/i915/i915_request.c
> +++ b/drivers/gpu/drm/i915/i915_request.c
> @@ -1242,6 +1242,9 @@ i915_request_await_execution(struct i915_request *rq,
>  			continue;
>  		}
>  
> +		if (fence->context == rq->fence.context)
> +			continue;
> +
>  		/*
>  		 * We don't squash repeated fence dependencies here as we
>  		 * want to run our callback in all cases.

The comment in here makes me nervous. Is this skipping on same context
other than squashing?

-Mika

> -- 
> 2.20.1