We are not allowed to assign rq->global_seqno=0 as it has a special
meaning of "inactive" (not executing on HW).
Fixes: 6faf5916e6be ("drm/i915: Remove HW semaphores for gen7 inter-engine synchronisation")
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/i915_request.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/i915_request.c b/drivers/gpu/drm/i915/i915_request.c
index 5403d4e2cee0..5e178f5ac18b 100644
--- a/drivers/gpu/drm/i915/i915_request.c
+++ b/drivers/gpu/drm/i915/i915_request.c
@@ -343,6 +343,13 @@ static void move_to_timeline(struct i915_request *request,
spin_unlock(&request->timeline->lock);
}
+static u32 next_global_seqno(struct i915_timeline *tl)
+{
+ if (!++tl->seqno)
+ ++tl->seqno;
+ return tl->seqno;
+}
+
void __i915_request_submit(struct i915_request *request)
{
struct intel_engine_cs *engine = request->engine;
@@ -359,7 +366,7 @@ void __i915_request_submit(struct i915_request *request)
GEM_BUG_ON(request->global_seqno);
- seqno = timeline_get_seqno(&engine->timeline);
+ seqno = next_global_seqno(&engine->timeline);
GEM_BUG_ON(!seqno);
GEM_BUG_ON(intel_engine_signaled(engine, seqno));
--
2.20.1
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