[PATCH 2/3] drm/amdgpu: explicitely sync to VM updates

[Christian König]

Allows us to reduce the overhead while syncing to fences a bit.

Signed-off-by: Christian König <christian.koenig at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c   | 18 +++++++-----------
 drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c | 22 +++++++++++++++++++---
 drivers/gpu/drm/amd/amdgpu/amdgpu_sync.h |  2 ++
 3 files changed, 28 insertions(+), 14 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
index 9e0c99760367..f21475352b88 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
@@ -799,29 +799,25 @@ static int amdgpu_cs_vm_handling(struct amdgpu_cs_parser *p)
 	if (r)
 		return r;
 
-	r = amdgpu_sync_fence(adev, &p->job->sync,
-			      fpriv->prt_va->last_pt_update, false);
+	r = amdgpu_sync_vm_fence(adev, &p->job->sync,
+				 fpriv->prt_va->last_pt_update);
 	if (r)
 		return r;
 
 	if (amdgpu_mcbp || amdgpu_sriov_vf(adev)) {
-		struct dma_fence *f;
-
 		bo_va = fpriv->csa_va;
 		BUG_ON(!bo_va);
 		r = amdgpu_vm_bo_update(adev, bo_va, false);
 		if (r)
 			return r;
 
-		f = bo_va->last_pt_update;
-		r = amdgpu_sync_fence(adev, &p->job->sync, f, false);
+		r = amdgpu_sync_vm_fence(adev, &p->job->sync,
+					 bo_va->last_pt_update);
 		if (r)
 			return r;
 	}
 
 	amdgpu_bo_list_for_each_entry(e, p->bo_list) {
-		struct dma_fence *f;
-
 		/* ignore duplicates */
 		bo = ttm_to_amdgpu_bo(e->tv.bo);
 		if (!bo)
@@ -835,8 +831,8 @@ static int amdgpu_cs_vm_handling(struct amdgpu_cs_parser *p)
 		if (r)
 			return r;
 
-		f = bo_va->last_pt_update;
-		r = amdgpu_sync_fence(adev, &p->job->sync, f, false);
+		r = amdgpu_sync_vm_fence(adev, &p->job->sync,
+					 bo_va->last_pt_update);
 		if (r)
 			return r;
 	}
@@ -849,7 +845,7 @@ static int amdgpu_cs_vm_handling(struct amdgpu_cs_parser *p)
 	if (r)
 		return r;
 
-	r = amdgpu_sync_fence(adev, &p->job->sync, vm->last_update, false);
+	r = amdgpu_sync_vm_fence(adev, &p->job->sync, vm->last_update);
 	if (r)
 		return r;
 
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c
index 95e5e93edd18..9b28c1eb5f49 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c
@@ -161,9 +161,6 @@ int amdgpu_sync_fence(struct amdgpu_device *adev, struct amdgpu_sync *sync,
 
 	if (!f)
 		return 0;
-	if (amdgpu_sync_same_dev(adev, f) &&
-	    amdgpu_sync_get_owner(f) == AMDGPU_FENCE_OWNER_VM)
-		amdgpu_sync_keep_later(&sync->last_vm_update, f);
 
 	if (amdgpu_sync_add_later(sync, f, explicit))
 		return 0;
@@ -179,6 +176,25 @@ int amdgpu_sync_fence(struct amdgpu_device *adev, struct amdgpu_sync *sync,
 	return 0;
 }
 
+/**
+ * amdgpu_sync_vm_fence - remember to sync to this VM fence
+ *
+ * @adev: amdgpu device
+ * @sync: sync object to add fence to
+ * @fence: the VM fence to add
+ *
+ * Add the fence to the sync object and remember it as VM update.
+ */
+int amdgpu_sync_vm_fence(struct amdgpu_device *adev, struct amdgpu_sync *sync,
+			 struct dma_fence *fence)
+{
+	if (!fence)
+		return 0;
+
+	amdgpu_sync_keep_later(&sync->last_vm_update, fence);
+	return amdgpu_sync_fence(adev, sync, fence, false);
+}
+
 /**
  * amdgpu_sync_resv - sync to a reservation object
  *
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_sync.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_sync.h
index b5f1778a2319..ac210dd34371 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_sync.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_sync.h
@@ -42,6 +42,8 @@ struct amdgpu_sync {
 void amdgpu_sync_create(struct amdgpu_sync *sync);
 int amdgpu_sync_fence(struct amdgpu_device *adev, struct amdgpu_sync *sync,
 		      struct dma_fence *f, bool explicit);
+int amdgpu_sync_vm_fence(struct amdgpu_device *adev, struct amdgpu_sync *sync,
+			 struct dma_fence *fence);
 int amdgpu_sync_resv(struct amdgpu_device *adev,
 		     struct amdgpu_sync *sync,
 		     struct dma_resv *resv,
-- 
2.17.1