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 In Linux 3.5 WIll Get MMAP, VMAP

Hardware

Published on 26 May 2012 08:48 AM EDT
Written by Michael Larabel in Hardware
2 Comments

The DMA-BUF buffer sharing mechanism in the Linux kernel will gain new features with the Linux 3.5 kernel.

On Friday the pull request was issued by Sumit Semwal of Linaro for the DMA-BUF framework that's used by ARM SoC vendors for sharing buffers between drivers and also is set to be used in the x86 space as well for sharing buffers between multiple graphics drivers.

The key features of the DMA-BUF updates for Linux 3.5 include mmap and vmap support. There's also documentation updates too.

While there is now the new features coming to DMA-BUF, right now the interfaces for using this buffer sharing mechanism are still exported as GPL-only and haven't been changed yet that would allow the binary-only Linux graphics drivers to use the symbols that in theory could make NVIDIA better support the Optimus technology with their driver.

Also not covered by this pull request are the DMA-BUF updates to the DRM drivers. Those changes will come in the DRM pull request. With the Linux 3.5 kernel, the leading open-source Linux graphics driver will provide proper support for DMA-BUF PRIME.

The 3.5 DMA-BUF pull request can be read on LKML.org.

On a related note, there's still DMA-BUF work being done by ARM for synchronizing access to buffers shared between drivers/devices using DMA-BUF, see this mailing list thread for the latest details.

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. Scythe Mugen MAX
  2. Intel Core i7 5960X Haswell-E On Linux
  3. Intel 80GB 530 Series M.2 SSD On Linux
  4. With A New Motherboard, The Core i7 5960X Haswell-E Lights Up
Latest Linux Articles
  1. Intel P-State vs. CPUFreq Benchmarks On The i7-5960X
  2. RadeonSI GLAMOR Benchmarks With X.Org Server 1.16
  3. RadeonSI Gallium3D vs. Catalyst At 4K UHD On Linux
  4. MSAA RadeonSI Gallium3D Performance Preview
Latest Linux News
  1. Ubuntu Touch/Phone Reaches Its First RTM Image
  2. The KMS Mode-Setting Driver Was Imported For X.Org Server 1.17
  3. SNA & UXA Intel Benchmarks With X.Org Server 1.16
  4. Graphics Driver Changes Coming In The Linux 3.18 Kernel
  5. Tropico 5 Being Released For Linux Gamers This Week
  6. Eclipse IDE Starts Firing Up On Wayland's Weston
  7. OpenSUSE Announcement On SUSE's Recent Merger
  8. Valve Begins Publicly Tracking AMD Catalyst Linux Issues
  9. Digia Qt Spinoff Is Called "The Qt Company"
  10. GNOME 3.14 Makes More Progress In Running Natively On Wayland
Latest Forum Discussions
  1. New Group Calls For Boycotting Systemd
  2. Updated and Optimized Ubuntu Free Graphics Drivers
  3. Stop grabbing my keyboard :(
  4. Best Radeon for a Power Mac G5?
  5. New stress testing utility for GPU's
  6. Hd 6850
  7. support for first generation UVD blocks (RV6xx, RS780, RS880 and RV790)
  8. Nvidia joins the ranks of Apple and Microsoft