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 [auto_oem_sig_96dpi_solid]
