[Intel-gfx] [PATCH i-g-t] i915/perf_pmu: Update inter-engine semaphore detection

[Tvrtko Ursulin]

On 26/05/2020 15:17, Chris Wilson wrote:
> The kernel no longer uses semaphores between engines, unless it can do
> so by preempting them with timeslices. Update the semaphore-busy to only
> run when we expect semaphore usage, i.e. not on bdw/bsw.
> 
> Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/1939
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> ---
>   tests/perf_pmu.c | 1 +
>   1 file changed, 1 insertion(+)
> 
> diff --git a/tests/perf_pmu.c b/tests/perf_pmu.c
> index e54a0d47e..e80f730cf 100644
> --- a/tests/perf_pmu.c
> +++ b/tests/perf_pmu.c
> @@ -822,6 +822,7 @@ sema_busy(int gem_fd,
>   	int fd;
>   
>   	igt_require(gem_scheduler_has_semaphores(gem_fd));
> +	igt_require(gem_scheduler_has_preemption(gem_fd));
>   
>   	fd = open_group(gem_fd,
>   			I915_PMU_ENGINE_SEMA(e->class, e->instance), -1);
> 

Test with perhaps too intimate knowledge of i915..

Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>

Regards,

Tvrtko