From: Chris Wilson <chris at chris-wilson.co.uk>
The complication is that during seqno wrapping we must be extremely
careful not to write to any ring as that will require a new seqno, and
so would recurse back into the seqno wrap handler. So we cannot call
i915_gpu_idle() as that does additional work beyond simply retiring the
current set of requests, and instead must do the minimal work ourselves
during seqno wrapping.
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Reviewed-by: Mika Kuoppala <mika.kuoppala at intel.com>
---
drivers/gpu/drm/i915/i915_gem.c | 12 ++++++++----
1 file changed, 8 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index e414507..e753cfc 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -1938,11 +1938,15 @@ i915_gem_handle_seqno_wrap(struct drm_device *dev)
if (ret == 0)
return ret;
- ret = i915_gpu_idle(dev);
- if (ret)
- return ret;
-
+ /* Carefully retire all requests without writing to the rings */
+ for_each_ring(ring, dev_priv, i) {
+ ret = intel_ring_idle(ring);
+ if (ret)
+ return ret;
+ }
i915_gem_retire_requests(dev);
+
+ /* Finally reset hw state */
for_each_ring(ring, dev_priv, i) {
ret = intel_ring_handle_seqno_wrap(ring);
if (ret)
--
1.7.9.5
