Jun's blog

该函数将cpu_addr表示的段虚拟地址映射到DMA缓冲区中,返回该缓冲区的dma_addr_t设备总线起始地址.而且往往对每次DMA传输都会重新建立一个流式映射的缓冲区，所以使用流式DMA映射时，流式DMA映射的特点是DMA传输通道使用的缓冲区不是由当前驱动程序自身分配的，linux内核DMA层为设备驱动提供的建立流式DMA映射的函数。设备驱动程序必须小心负责处理可能出现的cache一致性.

poll 是一种 I/O 多路复用技术，用于监视多个文件描述符的状态（如可读、可写或异常）。它比传统的 select 更高效，尤其在处理大量文件描述符时。

【代码】dma_resv。

如果持有锁的是新事务，那么正在请求锁的事务就选择等待如果持有锁的是老事务，那么正在请求锁的事务就放弃请求并终止场景: 事务A启动于10:00, 事务B启动于10:05, 事务C启动于10:10, 如果B持有锁，A和B同时去获取锁,那么结果是怎样?

【代码】dma-buf。

【代码】GEM和TTM。

sg_table and scatterlist

【代码】OpenGL VBO and VAO。

1 useful linkhttps://vulkan.lunarg.com/doc/sdk/1.3.211.0/linux/layer_configuration.html2 Configure Vulkan LayersConfiguring Vulkan Layers using Vulkan Configurator .Developers can configure layers through a graphical user interface. Vulkan Configurator

FramebufferA Framebuffer is a collection of buffers that can be used as the destination for rendering.OpenGL has two kinds of framebuffers: the Default Framebuffer, which is provided by the OpenGL Context; and user-created framebuffers called Framebu

1 Buffer ObjectBuffer Objects are OpenGL Objects that store an array of unformatted memory allocated by the OpenGL context (AKA(also know as) the GPU). These can be used to store vertex data, pixel data retrieved from images or the framebuffer, and a va

1 OpenGL ContextAn OpenGL context represents many things.A context stores all of the state associated with this instance of OpenGL.It represents the (potentially visible) default framebuffer that rendering commands will draw to when not drawing to a fr

1 环境Mesa3D 21.1.4Mesa3D-demosUbuntu 20.042 配置环境sudo apt install gcc;sudo apt install g++;sudo apt install vim;sudo apt install libx11-xcb-dev;sudo apt install libxext-dev;sudo apt install libxfixes-dev;sudo apt install libxcb-glx0-dev;sudo ap