[Intel-gfx] [PATCH 07/16] drm/i915/gt: Check for a completed last request once

[Tvrtko Ursulin]

On 24/11/2020 11:42, Chris Wilson wrote:
> Pull the repeated check for the last active request being completed to a
> single spot, when deciding whether or not execlist preemption is
> required.
> 
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> ---
>   drivers/gpu/drm/i915/gt/intel_lrc.c | 15 ++++-----------
>   1 file changed, 4 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.c b/drivers/gpu/drm/i915/gt/intel_lrc.c
> index cf11cbac241b..43703efb36d1 100644
> --- a/drivers/gpu/drm/i915/gt/intel_lrc.c
> +++ b/drivers/gpu/drm/i915/gt/intel_lrc.c
> @@ -2141,12 +2141,9 @@ static void execlists_dequeue(struct intel_engine_cs *engine)
>   	 */
>   
>   	if ((last = *active)) {
> -		if (need_preempt(engine, last, rb)) {
> -			if (i915_request_completed(last)) {
> -				tasklet_hi_schedule(&execlists->tasklet);
> -				return;
> -			}
> -
> +		if (i915_request_completed(last)) {
> +			goto check_secondary;
> +		} else if (need_preempt(engine, last, rb)) {
>   			ENGINE_TRACE(engine,
>   				     "preempting last=%llx:%lld, prio=%d, hint=%d\n",
>   				     last->fence.context,
> @@ -2174,11 +2171,6 @@ static void execlists_dequeue(struct intel_engine_cs *engine)
>   			last = NULL;
>   		} else if (need_timeslice(engine, last, rb) &&
>   			   timeslice_expired(execlists, last)) {
> -			if (i915_request_completed(last)) {
> -				tasklet_hi_schedule(&execlists->tasklet);
> -				return;
> -			}
> -
>   			ENGINE_TRACE(engine,
>   				     "expired last=%llx:%lld, prio=%d, hint=%d, yield?=%s\n",
>   				     last->fence.context,
> @@ -2214,6 +2206,7 @@ static void execlists_dequeue(struct intel_engine_cs *engine)
>   			 * we hopefully coalesce several updates into a single
>   			 * submission.
>   			 */
> +check_secondary:
>   			if (!list_is_last(&last->sched.link,
>   					  &engine->active.requests)) {

Is there a tasklet_hi_schedule in here? I see set_timeslice in my checkout.

Regards,

Tvrtko

>   				/*
>