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<div class="moz-cite-prefix">That the CPU round trip is gone now.<br>
<br>
Christian.<br>
<br>
Am 23.11.20 um 20:49 schrieb Marek Olšák:<br>
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cite="mid:CAAxE2A5BLn0ygJc6nx5QPW1qWq6hpvQbzFm51pzan+jhe_BWWw@mail.gmail.com">
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<div>What is the behavior we should expect?</div>
<div><br>
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<div>Marek<br>
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<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Mon, Nov 23, 2020 at 7:31
AM Christian König <<a
href="mailto:ckoenig.leichtzumerken@gmail.com"
moz-do-not-send="true">ckoenig.leichtzumerken@gmail.com</a>>
wrote:<br>
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<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Ping,
Pierre/Marek does this change works as expected?<br>
<br>
Regards,<br>
Christian.<br>
<br>
Am 18.11.20 um 14:20 schrieb Christian König:<br>
> This allows for optimizing the CPU round trip away.<br>
><br>
> Signed-off-by: Christian König <<a
href="mailto:christian.koenig@amd.com" target="_blank"
moz-do-not-send="true">christian.koenig@amd.com</a>><br>
> ---<br>
> drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c | 2 +-<br>
> drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c | 27
++++++++++++++++++++++++<br>
> drivers/gpu/drm/amd/amdgpu/amdgpu_sync.h | 1 +<br>
> 3 files changed, 29 insertions(+), 1 deletion(-)<br>
><br>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c<br>
> index 79342976fa76..68f9a4adf5d2 100644<br>
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c<br>
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c<br>
> @@ -1014,7 +1014,7 @@ static int
amdgpu_syncobj_lookup_and_add_to_sync(struct amdgpu_cs_parser
*p,<br>
> return r;<br>
> }<br>
> <br>
> - r = amdgpu_sync_fence(&p->job->sync,
fence);<br>
> + r =
amdgpu_sync_fence_chain(&p->job->sync, fence);<br>
> dma_fence_put(fence);<br>
> <br>
> return r;<br>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c
b/drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c<br>
> index 8ea6c49529e7..d0d64af06f54 100644<br>
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c<br>
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c<br>
> @@ -28,6 +28,8 @@<br>
> * Christian König <<a
href="mailto:christian.koenig@amd.com" target="_blank"
moz-do-not-send="true">christian.koenig@amd.com</a>><br>
> */<br>
> <br>
> +#include <linux/dma-fence-chain.h><br>
> +<br>
> #include "amdgpu.h"<br>
> #include "amdgpu_trace.h"<br>
> #include "amdgpu_amdkfd.h"<br>
> @@ -169,6 +171,31 @@ int amdgpu_sync_fence(struct
amdgpu_sync *sync, struct dma_fence *f)<br>
> return 0;<br>
> }<br>
> <br>
> +/**<br>
> + * amdgpu_sync_fence_chain - unpack dma_fence_chain and
sync<br>
> + *<br>
> + * @sync: sync object to add fence to<br>
> + * @f: potential dma_fence_chain to sync to.<br>
> + *<br>
> + * Add the fences inside the chain to the sync object.<br>
> + */<br>
> +int amdgpu_sync_fence_chain(struct amdgpu_sync *sync,
struct dma_fence *f)<br>
> +{<br>
> + int r;<br>
> +<br>
> + dma_fence_chain_for_each(f, f) {<br>
> + if (dma_fence_is_signaled(f))<br>
> + continue;<br>
> +<br>
> + r = amdgpu_sync_fence(sync, f);<br>
> + if (r) {<br>
> + dma_fence_put(f);<br>
> + return r;<br>
> + }<br>
> + }<br>
> + return 0;<br>
> +}<br>
> +<br>
> /**<br>
> * amdgpu_sync_vm_fence - remember to sync to this VM
fence<br>
> *<br>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_sync.h
b/drivers/gpu/drm/amd/amdgpu/amdgpu_sync.h<br>
> index 7c0fe20c470d..b142175b65b6 100644<br>
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_sync.h<br>
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_sync.h<br>
> @@ -48,6 +48,7 @@ struct amdgpu_sync {<br>
> <br>
> void amdgpu_sync_create(struct amdgpu_sync *sync);<br>
> int amdgpu_sync_fence(struct amdgpu_sync *sync, struct
dma_fence *f);<br>
> +int amdgpu_sync_fence_chain(struct amdgpu_sync *sync,
struct dma_fence *f);<br>
> int amdgpu_sync_vm_fence(struct amdgpu_sync *sync,
struct dma_fence *fence);<br>
> int amdgpu_sync_resv(struct amdgpu_device *adev, struct
amdgpu_sync *sync,<br>
> struct dma_resv *resv, enum
amdgpu_sync_mode mode,<br>
<br>
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