drm/amdgpu: fix dependency issue
The problem is that executing the jobs in the right order doesn't give you the right result
because consecutive jobs executed on the same engine are pipelined.
In other words job B does it buffer read before job A has written it's result.
Signed-off-by: Chunming Zhou <David1.Zhou@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c
index 2d11ac8..6e4ae0d 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c
@@ -160,6 +160,8 @@ int amdgpu_ib_schedule(struct amdgpu_ring *ring, unsigned num_ibs,
dev_err(adev->dev, "scheduling IB failed (%d).\n", r);
return r;
}
+ if (ring->funcs->emit_pipeline_sync && job && job->need_pipeline_sync)
+ amdgpu_ring_emit_pipeline_sync(ring);
if (vm) {
r = amdgpu_vm_flush(ring, job);