This allows for optimizing the CPU round trip away.
Signed-off-by: Christian König <christian.koenig@xxxxxxx>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c | 2 +-
drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c | 27 ++++++++++++++++++++++++
drivers/gpu/drm/amd/amdgpu/amdgpu_sync.h | 1 +
3 files changed, 29 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
index 79342976fa76..68f9a4adf5d2 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
@@ -1014,7 +1014,7 @@ static int amdgpu_syncobj_lookup_and_add_to_sync(struct amdgpu_cs_parser *p,
return r;
}
- r = amdgpu_sync_fence(&p->job->sync, fence);
+ r = amdgpu_sync_fence_chain(&p->job->sync, fence);
dma_fence_put(fence);
return r;
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c
index 8ea6c49529e7..d0d64af06f54 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c
@@ -28,6 +28,8 @@
* Christian König <christian.koenig@xxxxxxx>
*/
+#include <linux/dma-fence-chain.h>
+
#include "amdgpu.h"
#include "amdgpu_trace.h"
#include "amdgpu_amdkfd.h"
@@ -169,6 +171,31 @@ int amdgpu_sync_fence(struct amdgpu_sync *sync, struct dma_fence *f)
return 0;
}
+/**
+ * amdgpu_sync_fence_chain - unpack dma_fence_chain and sync
+ *
+ * @sync: sync object to add fence to
+ * @f: potential dma_fence_chain to sync to.
+ *
+ * Add the fences inside the chain to the sync object.
+ */
+int amdgpu_sync_fence_chain(struct amdgpu_sync *sync, struct dma_fence *f)
+{
+ int r;
+
+ dma_fence_chain_for_each(f, f) {
+ if (dma_fence_is_signaled(f))
+ continue;
+
+ r = amdgpu_sync_fence(sync, f);
+ if (r) {
+ dma_fence_put(f);
+ return r;
+ }
+ }
+ return 0;
+}
+
/**
* amdgpu_sync_vm_fence - remember to sync to this VM fence
*
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_sync.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_sync.h
index 7c0fe20c470d..b142175b65b6 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_sync.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_sync.h
@@ -48,6 +48,7 @@ struct amdgpu_sync {
void amdgpu_sync_create(struct amdgpu_sync *sync);
int amdgpu_sync_fence(struct amdgpu_sync *sync, struct dma_fence *f);
+int amdgpu_sync_fence_chain(struct amdgpu_sync *sync, struct dma_fence *f);
int amdgpu_sync_vm_fence(struct amdgpu_sync *sync, struct dma_fence *fence);
int amdgpu_sync_resv(struct amdgpu_device *adev, struct amdgpu_sync *sync,
struct dma_resv *resv, enum amdgpu_sync_mode mode,
--
2.25.1
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