DRM KMS学习资料.pdf

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Context description

DRM/KMS overview

Sharing my experience

The DRM/KMS subsystem from a newbie’s point of view Free Electrons. Kernel, drivers and embedded Linux development, consulting, training and support. http://free-electrons.com 1/49

Boris Brezillon Embedded Linux engineer and trainer at Free Electrons Embedded Linux development: kernel and driver development, system integration, boot time and power consumption optimization, consulting, etc. Embedded Linux training, Linux driver development training and Android system development training, with materials freely available under a Creative Commons license. http://free-electrons.com Contributions Kernel support for the AT91 SoCs ARM SoCs from Atmel Kernel support for the sunXi SoCs ARM SoCs from Allwinner Living in Toulouse, south west of France Free Electrons. Kernel, drivers and embedded Linux development, consulting, training and support. http://free-electrons.com 2/49

Agenda Context description What is this talk about ? How to display things in Linux ? DRM/KMS overview Global architecture Partial description of the components Sharing my experience Tips on developing a DRM/KMS driver Integration with userland graphic stacks Free Electrons. Kernel, drivers and embedded Linux development, consulting, training and support. http://free-electrons.com 3/49

Context: What is this talk about ? Sharing my understanding of the DRM/KMS subsytem learned while working on the Atmel HLCDC driver Explaining some key aspects (from my point of view) of the DRM/KMS subsystem Explaining some common concepts in the video/graphic world and showing how they are implemented in DRM/KMS Sharing some tips on how to develop a KMS driver based on my experience This talk is not: A detailed description of the DRM/KMS subsystem A description on how to use a DRM device (user-space API) And most importantly: this talk is not given by an expert Don’t hesitate to correct me if you think I’m wrong ;-) Free Electrons. Kernel, drivers and embedded Linux development, consulting, training and support. http://free-electrons.com 4/49

Context: How to display things in the Linux world Diﬀerent solutions, provided by diﬀerent subsystems: FBDEV: Framebuﬀer Device DRM/KMS: Direct Rendering Manager / Kernel Mode Setting V4L2: Video For Linux 2 How to choose one: it depends on your needs Each subsytem provides its own set of features Diﬀerent levels of complexity Diﬀerent levels of activity Free Electrons. Kernel, drivers and embedded Linux development, consulting, training and support. http://free-electrons.com 5/49

Context: Why choosing DRM/KMS ? Actively maintained Provides ﬁne grained control on the display pipeline Widely used by user-space graphic stacks Provides a full set of advanced features Why not FBDEV ? Less actively maintained Does not provides all the features we needed (overlays, hw cursor, ...) Developers are now encouraged to move to DRM/KMS Why not V4L2 ? Well suited for video capture and speciﬁc video output devices but not for ”complex” display controllers Free Electrons. Kernel, drivers and embedded Linux development, consulting, training and support. http://free-electrons.com 6/49

DRM/KMS: Deﬁnition DRM stands for Direct Rendering Manager and was introduced to deal with graphic cards embedding GPUs KMS stands for Kernel Mode Setting and is a sub-part of the DRM API Though rendering and mode setting are now splitted in two diﬀerent APIs (accessible through /dev/dri/renderX and /dev/dri/controlDX) KMS provide a way to conﬁgure the display pipeline of a graphic card (or an embedded system) KMS is what we’re interested in when looking for an FBDEV alternative Free Electrons. Kernel, drivers and embedded Linux development, consulting, training and support. http://free-electrons.com 7/49

DRM/KMS: Architecture Free Electrons. Kernel, drivers and embedded Linux development, consulting, training and support. http://free-electrons.com 8/49

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