[Intel-gfx] [PATCH 2/2] drm/i915: Fix semaphore emission for BDW+ RCS ringbuffer emission

[Michał Winiarski]

On Fri, Mar 24, 2017 at 03:17:24PM +0000, Chris Wilson wrote:
> 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 <chris at chris-wilson.co.uk>

Reviewed-by: Michał Winiarski <michal.winiarski at intel.com>

-Michał

> ---
>  drivers/gpu/drm/i915/intel_ringbuffer.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
> index 62756eb2bd4a..4729ac7ac122 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;
> -- 
> 2.11.0
> 
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