That the CPU round trip is gone now.
Christian.
Am 23.11.20 um 20:49 schrieb Marek Olšák:
What is the behavior we should expect?
Marek
On Mon, Nov 23, 2020 at 7:31 AM Christian König
<[email protected]
<mailto:[email protected]>> wrote:
Ping, Pierre/Marek does this change works as expected?
Regards,
Christian.
Am 18.11.20 um 14:20 schrieb Christian König:
> This allows for optimizing the CPU round trip away.
>
> Signed-off-by: Christian König <[email protected]
<mailto:[email protected]>>
> ---
> 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 <[email protected]
<mailto:[email protected]>>
> */
>
> +#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,
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