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The Extra DMA-BUF PRIME Patches For Linux 3.5

Linux Kernel

Published on 31 May 2012 11:29 AM EDT
Written by Michael Larabel in Linux Kernel
1 Comment

Another DRM pull request for the Linux 3.5 kernel has been issued. This extra pull provides the DRM DMA-BUF PRIME mmap/vmap support.

Building upon the massive DRM GPU driver changes in Linux 3.5 and the DMA-BUF 3.5 pull, there's now the pull from David Airlie that ties in the DRM driver changes to what landed in the DMA-BUF pull. In particular, the DRM drivers have been hooked into the PRIME MMAP/VMAP handling support. The groundwork for DMA-BUF PRIME was laid in Linux 3.4.

There's VMAP export support for the Intel, Radeon, and Nouveau drivers and then VMAP import support for UDL, the DisplayLink DRM driver. This will ultimately allow for some interesting possibilities with the Linux multi-seat computers, etc. But if you're hoping this buffer sharing work in the Linux 3.5 kernel will suddenly allow for proper NVIDIA Optimus, NVIDIA SLI, and AMD CrossFire, we're not there yet.

This "drm prime mmap/vmap" pull can be found at LKML.org.

About The Author
Michael Larabel is the principal author of Phoronix.com and founded the web-site in 2004 with a focus on enriching the Linux hardware experience and being the largest web-site devoted to Linux hardware reviews, particularly for products relevant to Linux gamers and enthusiasts but also commonly reviewing servers/workstations and embedded Linux devices. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics hardware drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated testing software. He can be followed via and or contacted via .
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