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drm/i915: Disable preempt busywait when using GuC scheduling

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Disable preempt busywait when using GuC scheduling. This isn't needed as
the GuC controls preemption when scheduling.

v2:
 (John H):
  - Fix commit message

Cc: John Harrison <john.c.harrison@intel.com>
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: John Harrison <John.C.Harrison@Intel.com>
Signed-off-by: John Harrison <John.C.Harrison@Intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210721215101.139794-12-matthew.brost@intel.com
This commit is contained in:
Matthew Brost 2021-07-21 14:50:54 -07:00 committed by John Harrison
parent 1f5cdb06b1
commit e6cb8dc93f
1 changed files with 4 additions and 2 deletions
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6
drivers/gpu/drm/i915/gt/gen8_engine_cs.c
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@ -506,7 +506,8 @@ gen8_emit_fini_breadcrumb_tail(struct i915_request *rq, u32 *cs)
*cs++ = MI_USER_INTERRUPT;
*cs++ = MI_ARB_ON_OFF | MI_ARB_ENABLE;
if (intel_engine_has_semaphores(rq->engine))
if (intel_engine_has_semaphores(rq->engine) &&
!intel_uc_uses_guc_submission(&rq->engine->gt->uc))
cs = emit_preempt_busywait(rq, cs);
rq->tail = intel_ring_offset(rq, cs);
@ -598,7 +599,8 @@ gen12_emit_fini_breadcrumb_tail(struct i915_request *rq, u32 *cs)
*cs++ = MI_USER_INTERRUPT;
*cs++ = MI_ARB_ON_OFF | MI_ARB_ENABLE;
if (intel_engine_has_semaphores(rq->engine))
if (intel_engine_has_semaphores(rq->engine) &&
!intel_uc_uses_guc_submission(&rq->engine->gt->uc))
cs = gen12_emit_preempt_busywait(rq, cs);
rq->tail = intel_ring_offset(rq, cs);