drm/i915: Add intel_ring_handle_seqno wrap
If there are pre-wrap values in semaphore-mbox registers after wrap,
syncing against some after-wrap request will complete immediately.
Fix this by emitting ring commands to set mbox registers to zero
when the wrap happens.
v2: Use __intel_ring_begin to emit ring commands, from
Chris Wilson.
Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
[danvet: Add a small comment to handle_seqno_wrap.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index cb94144..02d3151 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -1952,6 +1952,10 @@
i915_gem_retire_requests(dev);
for_each_ring(ring, dev_priv, i) {
+ ret = intel_ring_handle_seqno_wrap(ring);
+ if (ret)
+ return ret;
+
for (j = 0; j < ARRAY_SIZE(ring->sync_seqno); j++)
ring->sync_seqno[j] = 0;
}