drm/i915: Wait for pending flips on the GPU

Currently, if a batch buffer refers to an object with a pending flip,
then we sleep until that pending flip is completed (unpinned and
signalled). This is so that a flip can be queued and the user can
continue rendering to the backbuffer oblivious to whether the buffer is
still pinned as the scan out. (The kernel arbitrating at the last moment
to stall the batch and wait until the buffer is unpinned and replaced as
the front buffer.)

As we only have a queue depth of 1, we can simply wait for the current
pending flip to complete and continue rendering. We can achieve this
with a single WAIT_FOR_EVENT command inserted into the ring buffer prior
to executing the batch, *without* stalling the client.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

1 files changed, 4 insertions, 3 deletions

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 9109c00f3ead..7fe92d06eb26 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -4994,8 +4994,9 @@ static void do_intel_finish_page_flip(struct drm_device *dev,
         obj_priv = to_intel_bo(work->pending_flip_obj);
 
         /* Initial scanout buffer will have a 0 pending flip count */
-        if ((atomic_read(&obj_priv->pending_flip) == 0) ||
-            atomic_dec_and_test(&obj_priv->pending_flip))
+        atomic_clear_mask(1 << intel_crtc->plane,
+                          &obj_priv->pending_flip.counter);
+        if (atomic_read(&obj_priv->pending_flip) == 0)
                 wake_up(&dev_priv->pending_flip_queue);
         schedule_work(&work->work);
 
@@ -5092,7 +5093,7 @@ static int intel_crtc_page_flip(struct drm_crtc *crtc,
                 goto cleanup_objs;
 
         obj_priv = to_intel_bo(obj);
-        atomic_inc(&obj_priv->pending_flip);
+        atomic_add(1 << intel_crtc->plane, &obj_priv->pending_flip);
         work->pending_flip_obj = obj;
 
         if (IS_GEN3(dev) || IS_GEN2(dev)) {