gbm_bo_map synchronizes if it needs to move memory to make the buffer readable by the CPU or if the buffer is being used/written by the GPU.
Marek On Sat, Jun 15, 2024 at 1:12 AM Pierre Ossman <oss...@cendio.se> wrote: > > I'm experimenting with DRI3 and its use of GBM to share buffers. It > mostly works fine, but I'm seeing some issues that have me concerned > there might be a synchronisation issue. > > The documentation isn't entirely clear, so my question is if > gbm_bo_map() handles all the implicit synchronisation for me, or if > there is something more I can do? > > I tried doing gbm_bo_get_fd() followed by a select() and > ioctl(DMA_BUF_IOCTL_SYNC), but my issue did not go away. Now I'm unsure > if I'm doing it wrong, or if I'm chasing the wrong theory. > > Anyone with insight on what's needed for stable synchronisation? > > Regards, > -- > Pierre Ossman Software Development > Cendio AB https://cendio.com > Teknikringen 8 https://twitter.com/ThinLinc > 583 30 Linköping https://facebook.com/ThinLinc > Phone: +46-13-214600 > > A: Because it messes up the order in which people normally read text. > Q: Why is top-posting such a bad thing?
