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

NVIDIA Publishes PRIME Helper Patches

NVIDIA

Published on 06 December 2012 06:38 PM EST
Written by Michael Larabel in NVIDIA
5 Comments

NVIDIA is still working on a way to implement buffer-sharing for their closed-source Linux graphics driver.

NVIDIA still isn't permitted to properly use DMA-BUF for buffer sharing between their binary driver and the open-source graphics drivers for being able to properly support the NVIDIA Optimus technology. GPL-only kernel symbols are blocking NVIDIA from tapping DMA-BUF and there's a few kernel developers who don't want these symbols to be used by NVIDIA's blob.

As the latest on this front concerning proper multi-GPU support under Linux and the drivers being able to cooperate with each other, NVIDIA's Aaron Plattner has put out a set of four patches for PRIME helpers. The patches courtesy of the veteran Linux developer at NVIDIA provide helper functions to abstract core parts of the GEM PRIME import and export functions for video memory management.

These helper functions allow concealing some low-level details from the GPU drivers while remaining optional for drivers to use. "A driver can use them by plugging in drm_gem_prime_import and drm_gem_prime_export into the drm_driver structure, or it can bypass them by plugging in its own functions. The first patch adds these helpers, and the later patches switch three drivers over to using them."

Aside from making the changes to the core DRM for supporting these PRIME helpers, Aaron went ahead and hooked up the Nouveau, Radeon, and Exynos drivers for using the helper functions, which leads to a net reduction in the lines of code added. There's just under 300 lines of new code while nearly 500 lines of code was chopped out by removing duplicated code.

As a description of the work from Aaron himself, "Instead of reimplementing all of the dma_buf functionality in every driver, create helpers drm_prime_import and drm_prime_export that implement them in terms of new, lower-level hook functions. These hooks are optional; drivers can opt in by using drm_gem_prime_import and drm_gem_prime_export as the .gem_prime_import and .gem_prime_export fields of struct drm_driver."

These PRIME helper patches are currently floating on dri-devel.

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 R600g/RadeonSI Performance On Linux 3.16 With Mesa 10.3-devel
  2. Intel Pentium G3258 On Linux
  3. SilverStone Precision PS10
  4. ASRock Z97 Extreme6
Latest Linux Articles
  1. Nouveau vs. Radeon vs. Intel Tests On Linux 3.16, Mesa 10.3-devel
  2. KVM Benchmarks On Ubuntu 14.10
  3. X.Org Server 1.16 Officially Released With Terrific Features
  4. Ubuntu With Linux 3.16 Smashes OS X 10.9.4 On The MacBook Air
Latest Linux News
  1. A New Video Has Us Real Excited About The New UT For Linux
  2. CoreOS Experiences Its First Stable Release
  3. GNOME 3.13.4 Continues Working On Wayland & More
  4. Wine 1.7.23 Has Initial Support For 64-bit Android Builds
  5. FreeBSD Developing A New Automounter, Other Features
  6. Guix 0.7 Can Now Install The GNU Operating System
  7. X.Org Foundation Still Works Towards Becoming An SPI Project
  8. Open-Source AMD Hawaii Support Should Now Be Working!
  9. KDE Developers Continue Working Toward Wayland Support
  10. Ubuntu 14.04.1 LTS Released
Latest Forum Discussions
  1. Updated and Optimized Ubuntu Free Graphics Drivers
  2. AMD "Hawaii" Open-Source GPU Acceleration Still Not Working Right
  3. Radeon related kernel bug??
  4. how the US intellegentia operates:
  5. AMD Publishes Open-Source Linux HSA Kernel Driver
  6. Next-Gen OpenGL To Be Announced Next Month
  7. Open-Source Radeon Performance Boosted By Linux 3.16
  8. Remote gui not accessible in Phoronix Test Suite 5.2