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 Benchmarking Platform
Phoromatic Test Orchestration

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 News
  1. The Less-Powerful Intel Compute Stick With Ubuntu Will Soon Ship
  2. Kodi 15.0 Release Candidate 1 Arrives
  3. Fedora 23: Python 3 Default Approved; Netizen Spin Rejected
  4. GNOME Shell & Mutter Just Landed More Wayland Improvements
  5. Ubuntu MATE Announces A Partnership With A PC Hardware Vendor
  6. Linux 4, GCC v. Clang & Vulkan Were Among The Hot Stories So Far This Year
  7. FUSE Starts Working On Scalability Improvements With Linux 4.2
  8. Steam Linux Usage Continued Falling In June
  9. Blender 2.75 Released With AMD OpenCL Support, Multi-View/Stereo 3D Pipeline
  10. Radeon & AMDGPU DRM Fixes Queue Up For Linux 4.2
Latest Articles & Reviews
  1. 6-Way File-System Comparison On The Linux 4.1 Kernel
  2. How KDE VDG Is Trying To Make Open-Source Software Beautiful
  3. Attempting To Try Out BCache On The Linux 4.1 Kernel
  4. CompuLab's Fitlet Is A Very Tiny, Fanless, Linux PC With AMD A10 Micro
Most Viewed News This Week
  1. Kubuntu 15.10 Could Be The End Of The Road
  2. KDBUS Won't Be Pushed Until The Linux 4.3 Kernel
  3. Pinos Is For Linux Video What PulseAudio Is For Audio
  4. The State & Complications Of Porting The Unity Editor To Linux
  5. The Staging Pull For Linux 4.2: "Big, Really Big"
  6. Latest Rumor Pegs Microsoft Wanting To Buy AMD
  7. Exciting Features Merged So Far For The Linux 4.2 Kernel
  8. SteamOS "Brewmaster" Is Valve's New Debian 8.1 Based Version