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@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Michał Winiarski <michal.winiarski@xxxxxxxxx>
-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
>
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@xxxxxxxxxxxxxxxxxxxxx
> https://lists.freedesktop.org/mailman/listinfo/intel-gfx
_______________________________________________
Intel-gfx mailing list
Intel-gfx@xxxxxxxxxxxxxxxxxxxxx
https://lists.freedesktop.org/mailman/listinfo/intel-gfx
