[Intel-gfx] [PATCH 24/32] drm/i915: On GPU reset, set the HWS breadcrumb to the last seqno

Chris Wilson chris at chris-wilson.co.uk
Fri Dec 11 03:33:20 PST 2015

After the GPU reset and we discard all of the incomplete requests, mark
the GPU as having advanced to the last_submitted_seqno (as having
completed the requests and ready for fresh work). The impact of this is
negligble, as all the requests will be considered completed by this
point, it just brings the HWS into line with expectations for external

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
 drivers/gpu/drm/i915/i915_gem.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index ca327c0e73f1..78bcd231b100 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2836,6 +2836,8 @@ static void i915_gem_reset_ring_cleanup(struct drm_i915_private *dev_priv,
 		buffer->last_retired_head = buffer->tail;
+	intel_ring_init_seqno(ring, ring->last_submitted_seqno);
 void i915_gem_reset(struct drm_device *dev)

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