On Friday, June 2nd, 2023 at 12:29, Michel Dänzer <michel@xxxxxxxxxxx> wrote: > > 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? > > A dma-buf fd itself can serve this purpose; it polls as readable when the GPU has finished drawing to the buffer. If you _really_ need a sync_file FD, you can extract it via DMA_BUF_IOCTL_EXPORT_SYNC_FILE. This is a somewhat recent kernel uAPI.
