On Tue, Sep 02, 2014 at 02:32:40PM -0700, Jesse Barnes wrote:
> +static int i915_fence_check(wait_queue_t *wait, unsigned mode, int flags,
> + void *key)
> +{
> + struct i915_fence *intel_fence = wait->private;
> + struct intel_engine_cs *ring = intel_fence->ring;
> +
> + if (!i915_seqno_passed(ring->get_seqno(ring, false),
> + intel_fence->seqno))
> + return 0;
> +
> + fence_signal_locked(&intel_fence->base);
> +
> + __remove_wait_queue(&ring->irq_queue, wait);
> + fence_put(&intel_fence->base);
> + ring->irq_put(ring);
> +
> + return 0;
> +}
> +
> +static bool i915_fence_enable_signaling(struct fence *fence)
> +{
> + struct i915_fence *intel_fence = to_intel_fence(fence);
> + struct intel_engine_cs *ring = intel_fence->ring;
> + struct drm_i915_private *dev_priv = ring->dev->dev_private;
> + wait_queue_t *wait = &intel_fence->wait;
> +
> + /* queue fence wait queue on irq queue and get fence */
> + if (i915_seqno_passed(ring->get_seqno(ring, false),
> + intel_fence->seqno) ||
> + i915_terminally_wedged(&dev_priv->gpu_error))
> + return false;
> +
> + if (!ring->irq_get(ring))
> + return false;
> +
> + wait->flags = 0;
> + wait->private = intel_fence;
> + wait->func = i915_fence_check;
> +
> + __add_wait_queue(&ring->irq_queue, wait);
> + fence_get(fence);
> +
> + return true;
> +}
This looks like it implements poll().
You should recheck i915_request_complete() after setting up the irq
waiter. Or does struct fence_ops handle that?
-Chris
--
Chris Wilson, Intel Open Source Technology Centre
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