On Mon, Jan 25, 2016 at 11:29:19AM -0800, Rodrigo Vivi wrote:
> +++ b/drivers/gpu/drm/i915/intel_lrc.c
> @@ -764,18 +764,18 @@ intel_logical_ring_advance_and_submit(struct
> drm_i915_gem_request *request)
> {
> struct intel_ringbuffer *ringbuf = request->ringbuf;
> struct drm_i915_private *dev_priv = request->i915;
> + int i;
>
> intel_logical_ring_advance(ringbuf);
> request->tail = ringbuf->tail;
>
> /*
> - * Here we add two extra NOOPs as padding to avoid
> + * Here we add extra NOOPs as padding to avoid
> * lite restore of a context with HEAD==TAIL.
> - *
> - * Caller must reserve WA_TAIL_DWORDS for us!
> */
> - intel_logical_ring_emit(ringbuf, MI_NOOP);
> - intel_logical_ring_emit(ringbuf, MI_NOOP);
> + for (i = 0; i < ringbuf->wa_tail_dwords; i++)
> + intel_logical_ring_emit(ringbuf, MI_NOOP);
> +
> intel_logical_ring_advance(ringbuf);
>
> if (intel_ring_stopped(request->ring))
> @@ -876,6 +876,16 @@ int intel_logical_ring_begin(struct drm_i915_gem_request
> *req, int num_dwords)
> if (ret)
> return ret;
>
> + if (IS_GEN8(req->ring->dev) || IS_GEN9(req->ring->dev))
req->i915
This is attrocious. Just allocate the extra space when required.
-Chris
--
Chris Wilson, Intel Open Source Technology Centre
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