NVIDIA Still Working On PRIME/DMA-BUF Contribution
Aaron Plattner at NVIDIA is still working on the open-source "PRIME Helpers" patches for the Linux kernel. This is work towards ultimately better handling PRIME/DMA-BUF for NVIDIA Optimus Technology on Linux.
In early December I wrote about the original PRIME Helper patches courtesy of Plattner at NVIDIA. As written in that earlier article:
NVIDIA still isn't permitted to properly use DMA-BUF for buffer sharing between their binary driver and the open-source graphics drivers for being able to properly support the NVIDIA Optimus technology. GPL-only kernel symbols are blocking NVIDIA from tapping DMA-BUF and there's a few kernel developers who don't want these symbols to be used by NVIDIA's blob.Basically these patches allow for replacing GEM PRIME import/export functions -- the functions are common and shared amongst the Nouveau and Radeon DRM drivers -- with a driver's own custom functionality. For now this just leads to eliminating duplicated code between Radeon/Nouveau, but could theoretically allow for NVIDIA's binary driver to implement its own import/export hooks that don't directly rely upon the GPL-only DMA-BUF.
These PRIME Helper patches are currently dependent upon new DMA-BUF code landing for the Linux 3.9 kernel. This latest revision to the patches address some technical comments and concerns that Aaron received from the open-source graphics driver developers. The v3 helper patches can be found on the dri-devel list.
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