The VMware developers working on their "vmwgfx" graphics driver for Linux on their virtualization platform are preparing to have this driver leave the kernel's staging area and formally move into the Linux kernel DRM tree as one of the stable, mainline graphics drivers. But before this driver moves into the formal DRM tree, they are pushing a set of changes to clean up the kernel interface to this driver, which will break things in a non-backwards-compatible manner.
Thomas Hellstrom has pushed a set of eight patches
that are for the vmwgfx DRM driver that breaks the kernel interface exposed to the end-user. This is allowed since the driver is still in the staging area, but once this is complete, VMware hopes for this driver to finally leave staging. There may also be a couple more bumps coming up as they add more features to their driver. These patches remove some IOCTLs, update other IOCTLs, and implements fence objects.
These updates come several months after I mentioned VMware would be overhauling their Linux graphics driver
that's used by their virtualization products so that virtual machines can tap into graphics acceleration (and other APIs exposed by Gallium3D) on the host system. As part of this work they also introduced the XA state tracker
as a new means of X.Org acceleration.
Look for these DRM patches to land in the Linux 3.2 kernel and for the VMware driver to hopefully leave staging by the Linux 3.3 kernel.