We pre-increment the timeline->seqno when handing it to the request,
make sure the GEM_TRACE takes this into account. Otherwise, it appears
that we go backwards over a preemption point:
1d..1 157681077us : __i915_request_unsubmit: vcs0 fence 75e:3 <- global_seqno 17
0d.s1 157681113us : __i915_request_submit: vcs0 fence 75e:3 -> global_seqno 16
Fixes: d9b13c4dde6c ("drm/i915: Trace GEM steps between submit and wedging")
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx>
Cc: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_request.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/i915_request.c b/drivers/gpu/drm/i915/i915_request.c
index 2325886d1d55..f1b81fe4f9ab 100644
--- a/drivers/gpu/drm/i915/i915_request.c
+++ b/drivers/gpu/drm/i915/i915_request.c
@@ -501,7 +501,7 @@ void __i915_request_submit(struct i915_request *request)
GEM_TRACE("%s fence %llx:%d -> global_seqno %d\n",
request->engine->name,
request->fence.context, request->fence.seqno,
- engine->timeline->seqno);
+ engine->timeline->seqno + 1);
GEM_BUG_ON(!irqs_disabled());
lockdep_assert_held(&engine->timeline->lock);
--
2.16.2
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