Calling switch_to_kernel_context isn't needed if the engine PM reference is taken while all contexts are pinned. By not calling switch_to_kernel_context we save on issuing a request to the engine.
v2: (Daniel Vetter) - Add FIXME comment about pushing switch_to_kernel_context to backend
Signed-off-by: Matthew Brost matthew.brost@intel.com Reviewed-by: Daniel Vetter daniel.vetter@ffwll.ch --- drivers/gpu/drm/i915/gt/intel_engine_pm.c | 9 +++++++++ 1 file changed, 9 insertions(+)
diff --git a/drivers/gpu/drm/i915/gt/intel_engine_pm.c b/drivers/gpu/drm/i915/gt/intel_engine_pm.c index 1f07ac4e0672..11fee66daf60 100644 --- a/drivers/gpu/drm/i915/gt/intel_engine_pm.c +++ b/drivers/gpu/drm/i915/gt/intel_engine_pm.c @@ -162,6 +162,15 @@ static bool switch_to_kernel_context(struct intel_engine_cs *engine) unsigned long flags; bool result = true;
+ /* + * No need to switch_to_kernel_context if GuC submission + * + * FIXME: This execlists specific backend behavior in generic code, this + * should be pushed to the backend. + */ + if (intel_engine_uses_guc(engine)) + return true; + /* GPU is pointing to the void, as good as in the kernel context. */ if (intel_gt_is_wedged(engine->gt)) return true;