drm/amdgpu: add sched sync for amdgpu job v2

this is an improvement for previous patch, the sched_sync is to store fence
that could be skipped as scheduled, when job is executed, we didn't need
pipeline_sync if all fences in sched_sync are signalled, otherwise insert
pipeline_sync still.

v2: handle error when adding fence to sync failed.

Signed-off-by: Chunming Zhou <David1.Zhou@amd.com>
Reviewed-by: Junwei Zhang <Jerry.Zhang@amd.com> (v1)
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 7 insertions, 1 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c
index 53d0d21ee26d..631a9f77b973 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c
@@ -121,6 +121,7 @@ int amdgpu_ib_schedule(struct amdgpu_ring *ring, unsigned num_ibs,
 {
         struct amdgpu_device *adev = ring->adev;
         struct amdgpu_ib *ib = &ibs[0];
+        struct dma_fence *tmp;
         bool skip_preamble, need_ctx_switch;
         unsigned patch_offset = ~0;
         struct amdgpu_vm *vm;
@@ -160,8 +161,13 @@ 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)
+
+        if (ring->funcs->emit_pipeline_sync && job &&
+            (tmp = amdgpu_sync_get_fence(&job->sched_sync))) {
+                job->need_pipeline_sync = true;
                 amdgpu_ring_emit_pipeline_sync(ring);
+                dma_fence_put(tmp);
+        }
 
         if (vm) {
                 r = amdgpu_vm_flush(ring, job);