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. AMD's New Athlon/Semprons Give Old Phenom CPUs A Big Run For The Money
  2. 13-Way Low-End GPU Comparison With AMD's AM1 Athlon
  3. ASUS AM1I-A: A Mini-ITX Board For Socketed Kabini APUs
  4. Mini-Box M350: A Simple, Affordable Mini-ITX Case
Latest Linux Articles
  1. How Much Video RAM Is Needed For Catalyst R3 Graphics?
  2. Ubuntu 12.04 LTS vs. 14.04 LTS Cloud Benchmarks
  3. Ubuntu 12.04.4 vs. 13.10 vs. 14.04 LTS Desktop Benchmarks
  4. AMD OpenCL Performance With AM1 Kabini APUs
Latest Linux News
  1. Oracle Linux 6.5 vs. Oracle Linux 7.0 Beta Benchmarks
  2. Easter Yields The Linux 3.15-rc2 Kernel Release
  3. The Most Amazing OpenGL Tech Demo In 64kb
  4. Packard Bell LM85 Now Supported By Coreboot
  5. AmazonBasics External USB 2.0 DVD Writer For Linux
  6. TP-LINK TG-3468: A $12 Linux PCI-E Gigabit Network Adapter
  7. Linux 3.15 Lands Some DRM Graphics Driver Fixes
  8. AMD Is Disabling DPM Support For RV770 GPUs
  9. ReactOS Working On A Community Windows OS
  10. eRacks Keeps Pushing Linux, Open-Source Systems After 15 Years
  11. Borderlands Is Being Considered For Linux
  12. Mesa 10.0 & 10.1 Stable Get Updated
Latest Forum Discussions
  1. The GNOME Foundation Is Running Short On Money
  2. Updated and Optimized Ubuntu Free Graphics Drivers
  3. Catalyst 14.3 Beta
  4. Suggestions about how to make a Radeon HD 7790 work decently?
  5. Radeon 8000M problematic on Linux?
  6. Linux Kernel Developers Fed Up With Ridiculous Bugs In Systemd
  7. After Jack Keane, RuseSoft will briing Ankh 3 to Linux through Desura
  8. Suspected PHP Proxy Issue