drm/i915/execlists: Detect cross-contamination with GuC
The process_csb routine from execlists_submission is incompatible with the GuC backend. Add a warning to detect if we accidentally end up in the wrong spot. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Cc: Michal Wajdeczko <michal.wajdeczko@intel.com> Cc: Michał Winiarski <michal.winiarski@intel.com> Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190618110736.31155-1-chris@chris-wilson.co.uk
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@ -1169,6 +1169,7 @@ static void process_csb(struct intel_engine_cs *engine)
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u8 head, tail;
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lockdep_assert_held(&engine->active.lock);
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GEM_BUG_ON(USES_GUC_SUBMISSION(engine->i915));
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/*
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* Note that csb_write, csb_status may be either in HWSP or mmio.
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