[Bug 787594] New: allocators: DMABuf allocator need to implement DMA_BUF_IOCTL_SYNC

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=787594

            Bug ID: 787594
           Summary: allocators: DMABuf allocator need to implement
                    DMA_BUF_IOCTL_SYNC
    Classification: Platform
           Product: GStreamer
           Version: 1.13.x
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: nicolas at ndufresne.ca
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

This is needed to ensure cache coherency. Without this, if a mapped buffer is
modified, the driver may not be aware, hence may display broken images.

To implement this, we'll need hooks in GstFdMemory to execute additional
operation when map/unmap is called.

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