As we may unwind the requests, even though the request we are awaiting
has a global_seqno that seqno may be revoked during the await and so we
can not reliably use it as a barrier for all future awaits on the same
timeline.
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Michał Winiarski <michal.winiarski@xxxxxxxxx>
Reviewed-by: Michał Winiarski <michal.winiarski@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_gem_request.c | 37 +++++++++++++++++----------------
1 file changed, 19 insertions(+), 18 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_gem_request.c b/drivers/gpu/drm/i915/i915_gem_request.c
index b6246b50e375..b30d432415d8 100644
--- a/drivers/gpu/drm/i915/i915_gem_request.c
+++ b/drivers/gpu/drm/i915/i915_gem_request.c
@@ -708,33 +708,34 @@ i915_gem_request_await_request(struct drm_i915_gem_request *to,
}
seqno = i915_gem_request_global_seqno(from);
- if (!seqno) {
- ret = i915_sw_fence_await_dma_fence(&to->submit,
- &from->fence, 0,
- GFP_KERNEL);
- return ret < 0 ? ret : 0;
- }
+ if (!seqno)
+ goto await_dma_fence;
- if (seqno <= to->timeline->global_sync[from->engine->id])
- return 0;
-
- trace_i915_gem_ring_sync_to(to, from);
if (!i915.semaphores) {
- if (!i915_spin_request(from, TASK_INTERRUPTIBLE, 2)) {
- ret = i915_sw_fence_await_dma_fence(&to->submit,
- &from->fence, 0,
- GFP_KERNEL);
- if (ret < 0)
- return ret;
- }
+ if (!__i915_gem_request_started(from, seqno))
+ goto await_dma_fence;
+
+ if (!__i915_spin_request(from, seqno, TASK_INTERRUPTIBLE, 2))
+ goto await_dma_fence;
} else {
+ if (seqno <= to->timeline->global_sync[from->engine->id])
+ return 0;
+
+ trace_i915_gem_ring_sync_to(to, from);
ret = to->engine->semaphore.sync_to(to, from);
if (ret)
return ret;
+
+ to->timeline->global_sync[from->engine->id] = seqno;
}
- to->timeline->global_sync[from->engine->id] = seqno;
return 0;
+
+await_dma_fence:
+ ret = i915_sw_fence_await_dma_fence(&to->submit,
+ &from->fence, 0,
+ GFP_KERNEL);
+ return ret < 0 ? ret : 0;
}
int
--
2.11.0
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