1. Computers
  2. Display Drivers
  3. Graphics Cards
  4. Memory
  5. Motherboards
  6. Processors
  7. Software
  8. Storage
  9. Operating Systems


Facebook RSS Twitter Twitter Google Plus


Phoronix Test Suite

OpenBenchmarking.org

DMA-BUF PRIME Coming Together For Linux 3.5

Linux Kernel

Published on 12 May 2012 11:34 AM EDT
Written by Michael Larabel in Linux Kernel
18 Comments

The DMA-BUF PRIME support in the popular open-source Linux graphics drivers is coming together for the Linux 3.5 kernel to allow for GPU offloaded rendering.

Coming out this week was a new patch for the DMA-BUF/PRIME buffer sharing support so that Intel's DRM driver can offload rendering in one direction and outputs in the other. This patch is based upon David Airlie's work and amounts to just under 200 lines of code in the i915 kernel DRM driver.

Out on the same day from Alex Deucher was a patch entitled "add PRIME support" that effectively does the same as the Intel driver, but instead for the Radeon DRM driver. This too was just about 200 lines of code.

These patches come one week after David Airlie added PRIME sharing support to the TTM memory manager (here) as well as PRIME support for the Nouveau DRM driver (here).

This PRIME support builds upon the DMA-BUF buffer sharing mechanism that was originally merged into Linux 3.3 and the PRIME fundamentals in Linux 3.4. With the Linux 3.5 kernel is where the popular Direct Rendering Manager hardware drivers should support this for sharing buffers between drivers / GPUs. While Intel / Radeon / Nouveau are the most popular drivers, there's also been ongoing DMA-BUF work for the Texas Instruments OMAP, Samsung Exynos, and DisplayLink UDL KMS drivers too.

This technology can ultimately be used for things like NVIDIA Optimus or SLI/CrossFire. DMA-BUF itself largely was born within the Linaro camp for buffer sharing between driver drivers for ARM SoCs. Last November was when PRIME got back under-way for the GPU offloaded rendering.

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 .
Latest Linux Hardware Reviews
  1. Intel Xeon E5-1680 v3 & E5-2687W v3 Compared To The Core i7 5960X On Linux
  2. Intel 120GB 530 Series SSD Linux Performance
  3. Btrfs/EXT4/XFS/F2FS RAID 0/1/5/6/10 Linux Benchmarks On Four SSDs
  4. AMD's Windows Catalyst Driver Remains Largely Faster Than Linux Drivers
Latest Linux Articles
  1. Mesa Git Yields Performance Improvements For Newer AMD GPUs
  2. Apple OS X 10.10 vs. Ubuntu 14.10 Performance
  3. Mesa 10.5-devel Brings Some Intel Haswell HD Graphics Changes Over Mesa 10.3
  4. NVIDIA vs. Nouveau Drivers With Linux 3.18 + Mesa 10.4-devel
Latest Linux News
  1. IMP Launches As Another Open-Source Computer Attempt
  2. Git 2.2.0 Released With 550+ Changes
  3. GNOME 3.15.2 Released
  4. Quantum OS Aims For A Linux Desktop With QML, Wayland & Material Design
  5. New Open-Source, Linux Benchmarks To Feast On
  6. FreeBSD Plans For The Next Ten Years
  7. Qt 5.4 Planned For Release On 9 December
  8. Meizu's Ubuntu Phone Not Expected Until Early Next Year
  9. DragonFlyBSD 4.0 Drops i386 Support, Improves Graphics
  10. Expensive "Free/Libre Software Laptop" Uses A NVIDIA GPU
Latest Forum Discussions
  1. Updated and Optimized Ubuntu Free Graphics Drivers
  2. Hurrican SDL Port
  3. Roadmap to Catalyst 14.10 ?
  4. how to configure module phoromatic ?
  5. PulseAudio 6.0 Is Coming & Other Linux Audio Plans For The Future
  6. Debian Developer Resigns From The Systemd Maintainership Team
  7. Cant get working Kaveri APU - A10-7850k
  8. Script for Fan Speed Control