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Hi, In the past there has been writing about Wayland’s model using implicit synchronization of GPU renderbuffers and KMS commits [1] [2]. It would sometimes be nice to do that waiting explicitly in a compositor before enqueueing a KMS pageflip that references a buffer who may go on rendering for some time still. This stalls the pipeline. I’m wondering whether there’s an API -- maybe something analogous to drmPrimeHandleToFD() – that allows userspace to fetch a waitable fence fd for a dmabuf? -Matt [1]
https://www.collabora.com/news-and-blog/blog/2022/06/09/bridging-the-synchronization-gap-on-linux/ [2] https://lwn.net/Articles/814587/ Matt Hoosier Staff Software Engineer
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