Quoting Chris Wilson (2020-02-14 23:19:16)
> Let userspace know if they can trust timeslicing by including it as part
> of the I915_PARAM_HAS_SCHEDULER::I915_SCHEDULER_CAP_TIMESLICING
>
> Fixes: 8ee36e048c98 ("drm/i915/execlists: Minimalistic timeslicing")
> Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> Cc: Kenneth Graunke <kenneth@xxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/i915/gt/intel_engine_user.c | 1 +
> include/uapi/drm/i915_drm.h | 1 +
> 2 files changed, 2 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/gt/intel_engine_user.c b/drivers/gpu/drm/i915/gt/intel_engine_user.c
> index 848decee9066..760e586b7535 100644
> --- a/drivers/gpu/drm/i915/gt/intel_engine_user.c
> +++ b/drivers/gpu/drm/i915/gt/intel_engine_user.c
> @@ -98,6 +98,7 @@ static void set_scheduler_caps(struct drm_i915_private *i915)
> MAP(HAS_PREEMPTION, PREEMPTION),
> MAP(HAS_SEMAPHORES, SEMAPHORES),
> MAP(SUPPORTS_STATS, ENGINE_BUSY_STATS),
> + MAP(HAS_SEMAPHORES, TIMESLICES),
Strictly we want HAS_PREEMPTION && HAS_SEMAPHORES before we tell
userspace it can safely rely on timeslicing to yield from
MI_SEMAPHORE_WAIT.
-Chris
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