Commit 9ef36fc2 authored by Chris Wilson's avatar Chris Wilson Committed by Joonas Lahtinen

drm/i915: Disable semaphore inter-engine sync without timeslicing

Since the removal of the no-semaphore boosting, we rely on timeslicing to
reorder passed inter-dependency hogs across the engines. However, we
require preemption to support timeslicing into user payloads, and not all
machine support preemption so we do not universally enable timeslicing,
even when it would correctly preempt our own inter-engine semaphores.
Since timeslicing and semaphore priority deboosting is now disabled on
Broadwell/Braswell, we have to follow suite and not use semaphores.

Testcase: igt/gem_exec_schedule/semaphore-codependency # bdw/bsw
Fixes: 18e4af04 ("drm/i915: Drop no-semaphore boosting")
Signed-off-by: default avatarChris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Reviewed-by: default avatarTvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200521140617.30015-1-chris@chris-wilson.co.uk
(cherry picked from commit 0eb670aa)
Signed-off-by: default avatarJoonas Lahtinen <joonas.lahtinen@linux.intel.com>
parent b7ccc785
......@@ -230,7 +230,7 @@ static void intel_context_set_gem(struct intel_context *ce,
ce->timeline = intel_timeline_get(ctx->timeline);
if (ctx->sched.priority >= I915_PRIORITY_NORMAL &&
intel_engine_has_semaphores(ce->engine))
intel_engine_has_timeslices(ce->engine))
__set_bit(CONTEXT_USE_SEMAPHORES, &ce->flags);
}
......@@ -1969,7 +1969,7 @@ static int __apply_priority(struct intel_context *ce, void *arg)
{
struct i915_gem_context *ctx = arg;
if (!intel_engine_has_semaphores(ce->engine))
if (!intel_engine_has_timeslices(ce->engine))
return 0;
if (ctx->sched.priority >= I915_PRIORITY_NORMAL)
......
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