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Cross-Device Synchronization For DMA-BUF Still Coming

Linux Kernel

Published on 30 July 2013 04:43 AM EDT
Written by Michael Larabel in Linux Kernel
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Cross-device synchronization support for DMA-BUF is still being worked on for a future Linux kernel release.

This feature comes down to synchronizing the rendering of multiple devices via DMA-BUF, the buffer sharing mechanism introduced in the Linux kernel for sharing graphics buffers between DRM drivers and other related drivers in the context of ARM SoCs.

As said by Canonical's Maarten Lankhorst for what this new work can provide as an example, "userspace can call page_flip ioctl to display the next frame of graphics after kicking the GPU but while the GPU is still rendering. The display device sharing the buffer with the GPU would attach a callback to get notified when the GPU's rendering-complete IRQ fires, to update the scan-out address of the display, without having to wake up userspace."

The current DMA-BUF cross-device synchronization patch is now up to its 12th revision and can be found on the Linux kernel mailing list.

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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