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This article introduces the relevant knowledge of "what is the basic concept of Linux DRM". In the operation of actual cases, many people will encounter such a dilemma. Then let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

1. Introduction of DRM

   in the Linux kernel, you can use fbdev's API to manage the graphics adapter's framebuffer, but it cannot handle the 3D acceleration of modern GPU-based graphics cards. DRM, a subsystem of the Linux kernel, was originally developed as a kernel space component of X Server DRI and later used in other graphics stacks (such as Wayland). DRM is responsible for interacting with the GPU interface of modern graphics cards. User programs can use the API provided by DRM to send commands and data to GPU to realize the operation of class display mode setting, GPU hardware accelerated 3D rendering, video decoding and GPGPU (General GPU) calculation.

II. Introduction of nouns

The following table of    describes some of the nouns involved in the DRM framework:

Acronym interpretation DRIDirect Rendering Infrastructure basic level direct rendering DRMDirect Rendering Manager direct rendering manager FBDEVFramebuffer Device frame buffer device GEMGraphics Execution Manager graphics execution manager KMSKernel Mode Setting kernel display mode setting UMSUser-space Mode Setting user space display mode setting V4L2Video For Linux 2linux video device driver 3. DRM framework

The    Linux DM framework consists of two parts: DRM core and DRM driver. DRM core implements the basic framework of DRM, allows you to register DRM driver, and provides a set of ioctl for user space. DRM driver mainly implements the hardware partial drivers such as CPU/GPU that it supports, and provides ioctl implementations that are not covered by DRM core or extended (available only on such hardware). User space programs can use libdrm to access various interfaces of the DRM framework.

Since    has only debugged libdrm and Linux DRM in the actual project, these two parts will be introduced later. The following figure is excerpted from the network and introduces the DRM framework.

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