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@vmware.com 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