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DMA-BUF Cross-Device Synchronization Still Baking

Linux Kernel

Published on 17 February 2014 11:05 AM EST
Written by Michael Larabel in Linux Kernel
7 Comments

One of the features that multi-GPU (Optimus/PRIME) owners and other DMA_BUF-using Linux users have been waiting on is cross-device synchronization support. Patches are still flowing for this missing feature and with some luck maybe we will finally see it ready for the Linux 3.15 kernel.

Maarten Lankhorst of Canonical has sent out his latest patch series that adds fence and poll support to DMA_BUF for providing cross-device synchronization support. The DMA-BUF sync support is now up to its 17th patch revision. These latest patches were published this morning and can be found on the dri-devel mailing list.

This work has been ongoing for several months and can lead to reduce tearing and other improvements with being able to synchronize the buffer sharing process between GPU DRM drivers. There's also use-cases in the ARM SoC world too for those using DMA-BUF for sharing of buffers between drivers. It's way too late to see DMA_BUF synchronization for Linux 3.14, but hopefully it will finally be ready in time for the Linux 3.15 kernel in a couple months.

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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