From: Chris Wilson Date: Fri, 24 Mar 2017 15:17:24 +0000 (+0000) Subject: drm/i915: Fix semaphore emission for BDW+ RCS ringbuffer emission X-Git-Tag: v4.12~21^2~16^2~57 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=6f9b850bec05ba8b08c504112808973259e41140;p=platform%2Fkernel%2Flinux-exynos.git 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: Chris Wilson Link: http://patchwork.freedesktop.org/patch/msgid/20170324151724.32640-2-chris@chris-wilson.co.uk Reviewed-by: Michał Winiarski --- diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c index 62756eb..4729ac7 100644 --- a/drivers/gpu/drm/i915/intel_ringbuffer.c +++ b/drivers/gpu/drm/i915/intel_ringbuffer.c @@ -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;