drm/i915: Do the fallback non-IRQ wait in ring throttle, too.

As a workaround for IRQ synchronization issues in the gen7 BLT ring,
we want to turn the two wait functions into polling loops.

Signed-off-by: Eric Anholt <eric@anholt.net>
Tested-by: Eugeni Dodonov <eugeni.dodonov@intel.com>
Reviewed-by: Eugeni Dodonov <eugeni.dodonov@intel.com>
Acked-by: Kenneth Graunke <kenneth@whitecape.org>
Signed-off-by: Keith Packard <keithp@keithp.com>

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 8359dc777041be9265e53907025564196b1d0fbc..66e0a555dbccfc51b1e6fa7c078869bcce4413da 100644 (file)
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -3309,6 +3309,10 @@ i915_gem_ring_throttle(struct drm_device *dev, struct drm_file *file)
 
                        if (ret == 0 && atomic_read(&dev_priv->mm.wedged))
                                ret = -EIO;
+               } else if (wait_for(i915_seqno_passed(ring->get_seqno(ring),
+                                                     seqno) ||
+                                   atomic_read(&dev_priv->mm.wedged), 3000)) {
+                       ret = -EBUSY;
                }
        }