Nouveau源码分析(二):Nouveau结构体的基本框架

本文深入探讨Nouveau源码,重点解析其如何通过模拟继承和虚拟函数来构建C++类似的结构。文章首先介绍模拟继承的概念,展示了相关代码示例,接着讲解了如何实现模拟虚拟函数,以及如何利用标识符获取oclass来实现对不同设备模块的统一访问。尽管Nouveau代码中还存在parent关系,但本文主要聚焦于继承和虚拟函数的模拟实现。

摘要生成于 C知道 ,由 DeepSeek-R1 满血版支持, 前往体验 >

Nouveau源码分析(二)

在讨论Nouveau对Nvidia设备的初始化前,我准备先说一下Nouveau结构体的基本框架

Nouveau的很多结构体都可以看作是C++中的类,之间有很多相似的东西,比如继承关系,virtual成员函数等.

模拟继承

先尝试阅读一下这个代码:

#include <stdlib.h>

struct abc
{
   int a;
   int b;
   int c;
};

struct def
{
   struct abc base;
   int d;
   int e;
   int f;
};

#define abc_create(a,b,c,pabc) \
   abc_create_(a,b,c,sizeof(**pabc),(void **)pabc)

int abc_create_(int a,int b,int c,
                 size_t size,void **pabc)
{
   struct abc *abc_ = (struct abc *)malloc(size); //按传入的size分配空间

   abc_->a = a;
   abc_->b = b;
   abc_->c = c; //初始化自身

   *pabc = abc_;
   return 0;
}

#define def_create(a,b,c,d,e,f,pdef) \
   def_create_(a,b,c,d,e,f,sizeof(**pdef),(void **)pdef) //获得实际应分配空间大小

int def_create_(int a,int b,int c,int d,int e,int f,
                 size_t size,void **pdef)
{
   struct def *def_;
   abc_create_(a,b
### Nouveau DRM Driver Issue on GPU 0000:01:00.0 Solution For addressing the Nouveau DRM driver issue specifically with the GPU identified as `0000:01:00.0`, several strategies can be employed based on previous experiences and solutions found within similar contexts. #### Disabling Kernel Mode Setting Temporarily During Boot To temporarily disable kernel mode setting (KMS), which is often responsible for display issues related to the Nouveau driver, one should add a boot parameter when starting up the system. This involves accessing the GRUB menu by pressing Shift during startup or using Ctrl+Alt+F1-F6 keys depending upon the setup[^2]. Once at the GRUB screen: - Navigate to the line that begins with 'linux' or 'linux16'. - Add `nomodeset` after any existing parameters like `quiet splash`. - Press F10 or Ctrl+X to continue booting into the operating system with these temporary changes applied. This method allows bypassing potential graphical glitches caused by KMS until more permanent fixes are implemented. #### Permanently Adjusting Grub Configuration File Permanently altering how the system handles graphics drivers requires editing `/etc/default/grub`. By modifying this configuration file, it's possible to ensure that every time the machine boots, certain settings take effect automatically without manual intervention each reboot. ```bash sudo nano /etc/default/grub ``` Within this text editor session, locate the line containing `GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"` and append `nomodeset` so it reads something akin to `"quiet splash nomodeset"`. After saving modifications (`Ctrl+O`) and exiting (`Ctrl+X`): ```bash sudo update-grub ``` Executing this command updates all necessary files ensuring new configurations will apply from next boot onwards[^4]. #### Preventing Nouveau Module Loading via Blacklisting Another approach entails preventing Linux from loading the problematic Nouveau module altogether through blacklisting techniques. Editing another critical configuration file achieves this goal effectively while allowing alternative proprietary NVIDIA drivers installation later if desired. ```bash echo "blacklist nouveau" | sudo tee -a /etc/modprobe.d/blacklist.conf echo "options nouveau modeset=0" | sudo tee -a /etc/modprobe.d/nouveau-kms-off.conf ``` After applying such commands, regenerate initramfs images to incorporate recent alterations before restarting your computer normally. ```bash sudo update-initramfs -u ``` These actions collectively contribute towards mitigating common challenges associated with incompatible open-source graphic card drivers under various distributions of GNU/Linux systems including Debian-based ones where Nouveau conflicts arise frequently due to hardware incompatibilities[^3]. --related questions-- 1. What other methods exist besides disabling KMS for troubleshooting display problems? 2. How does adding `nomodeset` impact overall performance compared to default behavior? 3. Can installing proprietary NVIDIA drivers resolve ongoing issues better than tweaking Nouveau options? 4. Is there an optimal way to switch between different video drivers seamlessly post-installation?
评论
添加红包

请填写红包祝福语或标题

红包个数最小为10个

红包金额最低5元

当前余额3.43前往充值 >
需支付:10.00
成就一亿技术人!
领取后你会自动成为博主和红包主的粉丝 规则
hope_wisdom
发出的红包
实付
使用余额支付
点击重新获取
扫码支付
钱包余额 0

抵扣说明:

1.余额是钱包充值的虚拟货币,按照1:1的比例进行支付金额的抵扣。
2.余额无法直接购买下载,可以购买VIP、付费专栏及课程。

余额充值