drm/i915: Add intel_ring_handle_seqno wrap

[karo-tx-linux.git] / drivers / gpu / drm / i915 / intel_ringbuffer.c

diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 01a660a7c16701034ab4bb6355d8f9c8ff90610a..0d03dc649c5ef4e8dcc7ac9f04959882635deb36 100644 (file)
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -1402,6 +1402,28 @@ int intel_ring_begin(struct intel_ring_buffer *ring,
        return __intel_ring_begin(ring, num_dwords * sizeof(uint32_t));
 }
 
+int intel_ring_handle_seqno_wrap(struct intel_ring_buffer *ring)
+{
+       int ret;
+
+       BUG_ON(ring->outstanding_lazy_request);
+
+       if (INTEL_INFO(ring->dev)->gen < 6)
+               return 0;
+
+       ret = __intel_ring_begin(ring, 6 * sizeof(uint32_t));
+       if (ret)
+               return ret;
+
+       /* Leaving a stale, pre-wrap seqno behind in the mboxes will result in
+        * post-wrap semaphore waits completing immediately. Clear them. */
+       update_mboxes(ring, ring->signal_mbox[0]);
+       update_mboxes(ring, ring->signal_mbox[1]);
+       intel_ring_advance(ring);
+
+       return 0;
+}
+
 void intel_ring_advance(struct intel_ring_buffer *ring)
 {
        struct drm_i915_private *dev_priv = ring->dev->dev_private;