Shared semaphores for amdgpu

[Dave Airlie]

On 10 March 2017 at 13:25, Dave Airlie <airlied at gmail.com> wrote:
>>
>> As far as I can see the only functionality we are missing here is:
>>
>> void sync_file_signal(struct sync_file *sync_file, struct dma_fence *fence)
>> {
>>     dma_fence_put(sync_file->fence);
>>     sync_file->fence = fence;
>> }
>>
>> We probably should do this atomically, but that is only a matter of taking
>> locks/atomic pointer operation.
>>
>> The waiting is done using the normal sync_file_get_fence() function.
>>
>> The rest is David's patch to import/export the fd handle into a local idr
>> based handle.
>
> Are you suggesting we start keeping track of sync_file objects in a local idr?
>
> As currently they are only tracked as files, which is probably not what we want
> for every unshared semaphore, or are you thinking more that the amdgpu local
> sem should be just storing a sync_file pointer, rather than what it does now.

Okay here's a first pass at what I think you mean, it's missing
things, but the idea
should be what you said.

Dave.
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