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drm/amdgpu: fix dependency issue

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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>
This commit is contained in:
Chunming Zhou
2017-05-09 13:39:40 +08:00
committed by Alex Deucher
parent cb3696fdec
commit 30514decb2
6 changed files with 27 additions and 1 deletions
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2
drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c
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@@ -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);