On pe, 2016-07-22 at 10:14 +0100, Chris Wilson wrote:
> static int
> -gen8_ring_sync(struct drm_i915_gem_request *wait,
> - struct drm_i915_gem_request *signal)
> +gen8_ring_sync_to(struct drm_i915_gem_request *req,
> + struct drm_i915_gem_request *signal)
> {
> - struct intel_ring *waiter = wait->ring;
> - struct drm_i915_private *dev_priv = wait->i915;
> - u64 offset = GEN8_WAIT_OFFSET(wait->engine, signal->engine->id);
> + struct intel_ring *ring = req->ring;
> + struct drm_i915_private *dev_priv = req->i915;
> + u64 offset = GEN8_WAIT_OFFSET(req->engine, signal->engine->id);
> struct i915_hw_ppgtt *ppgtt;
> int ret;
>
> - ret = intel_ring_begin(wait, 4);
> + ret = intel_ring_begin(req, 4);
> if (ret)
> return ret;
>
> - intel_ring_emit(waiter, MI_SEMAPHORE_WAIT |
> - MI_SEMAPHORE_GLOBAL_GTT |
> - MI_SEMAPHORE_SAD_GTE_SDD);
> - intel_ring_emit(waiter, signal->fence.seqno);
> - intel_ring_emit(waiter, lower_32_bits(offset));
> - intel_ring_emit(waiter, upper_32_bits(offset));
> - intel_ring_advance(waiter);
> + intel_ring_emit(ring,
> + MI_SEMAPHORE_WAIT |
> + MI_SEMAPHORE_GLOBAL_GTT |
> + MI_SEMAPHORE_SAD_GTE_SDD);
> + intel_ring_emit(ring, signal->fence.seqno);
> + intel_ring_emit(ring, lower_32_bits(offset));
> + intel_ring_emit(ring, upper_32_bits(offset));
> + intel_ring_advance(ring);
>
> /* When the !RCS engines idle waiting upon a semaphore, they lose their
> * pagetables and we must reload them before executing the batch.
> * We do this on the i915_switch_context() following the wait and
> * before the dispatch.
> */
> - ppgtt = wait->ctx->ppgtt;
> - if (ppgtt && wait->engine->id != RCS)
> - ppgtt->pd_dirty_rings |= intel_engine_flag(wait->engine);
> + ppgtt = req->ctx->ppgtt;
This assignment could still be lifted up.
Reviewed-by: Joonas Lahtinen <joonas.lahti...@linux.intel.com>
> + if (ppgtt && req->engine->id != RCS)
> + ppgtt->pd_dirty_rings |= intel_engine_flag(req->engine);
> return 0;
> }
>
--
Joonas Lahtinen
Open Source Technology Center
Intel Corporation
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