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Commit 6f9b850b authored by Chris Wilson's avatar Chris Wilson
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drm/i915: Fix semaphore emission for BDW+ RCS ringbuffer emission 



The required number of dwords for semaphore emission on BDW RCS is 8,
not 6 - leading to ring buffer corruption and immediate GPU hangs when
using ringbuffer submission.

Signed-off-by: default avatarChris Wilson <chris@chris-wilson.co.uk>
Link: http://patchwork.freedesktop.org/patch/msgid/20170324151724.32640-2-chris@chris-wilson.co.uk


Reviewed-by: default avatarMichał Winiarski <michal.winiarski@intel.com>
parent e02d9d76

drivers/gpu/drm/i915/intel_ringbuffer.c

+1 −1
Original line number Diff line number Diff line
@@ -2117,7 +2117,7 @@ int intel_init_render_ring_buffer(struct intel_engine_cs *engine) 


			num_rings =

				hweight32(INTEL_INFO(dev_priv)->ring_mask) - 1;

			engine->emit_breadcrumb_sz += num_rings * 6;

			engine->emit_breadcrumb_sz += num_rings * 8;

		}

	} else if (INTEL_GEN(dev_priv) >= 6) {

		engine->init_context = intel_rcs_ctx_init;