DRM KMS Locking Rework Readied For Linux 3.9
Written by Michael Larabel in Linux Kernel on 21 January 2013 at 01:13 AM EST. 3 Comments
The DRM KMS locking re-work patch series is ready and has been queued up for merging into the Linux 3.9 kernel.

From the branch merge into drm-next:
The aim of this locking rework is that ioctls which a compositor should be might call for every frame (set_cursor, page_flip, addfb, rmfb and getfb/create_handle) should not be able to block on kms background activities like output detection. And since each EDID read takes about 25ms (in the best case), that always means we'll drop at least one frame.

The solution is to add per-crtc locking for these ioctls, and restrict background activities to only use the global lock. Change-the-world type of events (modeset, dpms, ...) need to grab all locks.
The Linux 3.9 kernel will also present improved HDA Intel audio driver support, Intel graphics improvements, deprecates Radeon UMS, and various other work to be talked about in Phoronix articles over the coming weeks.
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Michael Larabel is the principal author of Phoronix.com and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated benchmarking software. He can be followed via Twitter or contacted via MichaelLarabel.com.

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