On Thu, Dec 12, 2013 at 11:30:23PM +0100, Daniel Vetter wrote: > On Thu, Dec 12, 2013 at 8:34 PM, Thomas Hellstrom <thellstrom@xxxxxxxxxx> wrote: > > On 12/12/2013 03:36 PM, Thierry Reding wrote: > >> > >> This is a simple test module that can be used to allocate, export and > >> delete DMA-BUF objects. It can be used to test DMA-BUF sharing in > >> systems that lack a real second driver. > >> > >> > > > > Looks nice. I wonder whether this could be extended to create a "streaming" > > dma-buf from a user space mapping. That could be used as a generic way to > > implement streaming (user) buffer objects, rather than to add explicit > > support for those in, for example, TTM. > > Atm there's no way to get gpus to unbind their dma-buf mappings, so > their essentially pinned forever from first use on. Shouldn't this work by simply calling the GEM_CLOSE IOCTL on the handle returned by drmPrimeFDToHandle()? I mean that should drop the last reference on the GEM object and cause it to be cleaned up (which should include detaching the DMA-BUF). Thierry
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