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

"Atomic Display Framework" Shown For Linux

Google

Published on 29 August 2013 05:06 AM EDT
Written by Michael Larabel in Google
11 Comments

A Google developer has released code to a new Linux kernel project: ADF, the Atomic Display Framework. This kernel framework came about as the developer was experimenting with KMS and Android.

Greg Hackmann is the Google developer responsible for this new display framework. The Atomic Display Framework came about as he was experimenting with a KMS-based hardware composer for Android. ADF is designed to take care of some shortcomings Hackmann had in dealing with the Linux kernel mode-setting code like it being designed around updating one object at a time, SoC mapping to different objects can be a challenge, there isn't support for custom pixel formats, and there isn't a way for exchanging sync fences. ADF seeks to address some of these KMS shortcomings but for now these "request for comments" patches aren't KMS-based and simply seeking feedback whether there's interest in going forth and merging this work in the future.

Greg will be talking about the Atomic Display Framework at this year's Linux Plumbers Conference for those interested. The work right now consists of four patches and can be found on dri-devel. In ending, here's the full developer description on the Atomic Display Framework.
ADF represents display devices as collections of overlay engines and interfaces. Overlay engines (struct adf_overlay_engine) scan out images and interfaces (struct adf_interface) display those images. Overlay engines and interfaces can be connected in any n-to-n configuration that the hardware supports.

Clients issue atomic updates to the screen by passing in a list of buffers (struct adf_buffer) consisting of dma-buf handles, sync fences, and basic metadata like format and size. If this involves composing multiple buffers, clients include a block of custom data describing the actual composition (scaling, z-order, blending, etc.) in a driver-specific format.

Drivers provide hooks to validate these custom data blocks and commit the new configuration to hardware. ADF handles importing the dma-bufs and fences, waiting on incoming sync fences before committing, advancing the display's sync timeline, and releasing dma-bufs once they're removed from the screen.

ADF represents pixel formats using DRM-style fourccs, and automatically sanity-checks buffer sizes when using one of the formats listed in drm_fourcc.h. Drivers can support custom fourccs if they provide hooks to validate buffers that use them.

ADF also provides driver hooks for modesetting, managing and reporting hardware events like vsync, and changing DPMS state. These are documented in struct adf_{obj,overlay_engine,interface,device}_ops, and are similar to the equivalent DRM ops.

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. MSI X99S SLI PLUS On Linux
  2. NVIDIA GeForce GTX 970 Offers Great Linux Performance
  3. CompuLab Intense-PC2: An Excellent, Fanless, Mini PC Powered By Intel's i7 Haswell
  4. From The Atom 330 To Haswell ULT: Intel Linux Performance Benchmarks
Latest Linux Articles
  1. Open-Source Radeon 2D Performance Is Better With Ubuntu 14.10
  2. RunAbove: A POWER8 Compute Cloud With Offerings Up To 176 Threads
  3. 6-Way Ubuntu 14.10 Linux Desktop Benchmarks
  4. Ubuntu 14.10 XMir System Compositor Benchmarks
Latest Linux News
  1. Dead Island GOTY Now Available On Linux/SteamOS
  2. Ubuntu 14.04 In The Power8 Cloud From RunAbove
  3. KDE With Theoretical Client-Side Decorations, Windows 10 Influence
  4. Sandusky Lee: Great Cabinets For Storing All Your Computer Gear
  5. Fedora 21 Beta & Final Release Slip Further
  6. Mesa 10.3.2 Has A Couple Bug-Fixes
  7. RadeonSI/R600g HyperZ Support Gets Turned Back On
  8. openSUSE Factory & Tumbleweed Are Merging
  9. More Fedora Delays: Fedora 21 Beta Slips
  10. Mono Brings C# To The Unreal Engine 4
Latest Forum Discussions
  1. Looking for a Open-Source AMD experienced Linux mentor
  2. Users/Developers Threatening Fork Of Debian GNU/Linux
  3. Updated and Optimized Ubuntu Free Graphics Drivers
  4. HOPE: The Ease Of Python With The Speed Of C++
  5. Use Ubuntu MATE 14.10 Make it an official distro.
  6. Debian Is Back To Discussing Init Systems, Freedom of Choice
  7. AMD Radeon VDPAU Video Performance With Gallium3D
  8. Ubuntu 16.04 Might Be The Distribution's Last 32-Bit Release