Nouveau源码分析(零):前言、目录

本文是关于NVIDIA Nouveau开源驱动的源码分析系列文章的前言,作者在缺乏官方文档的情况下,决定挑战分析Nouveau内核部分,主要参考linux 3.7版本的源码。内容包括Nouveau的模块初始化、结构体框架、设备初始化等,后续将逐步深入各个SUBDEV/ENGINE的初始化过程。

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Nouveau源码分析(零)

前言:

最近在尝试操作系统图形化的驱动加速方面,因为我家电脑是NVIDIA的,所以就先研究一下NVIDIA方面的吧.

Intel和AMD的显卡都有丰富的文档,因此相对来说比较简单.而NVIDIA则十分保守,甚至于没有一点公开官方文档可供查阅.非官方文档也是屈指可数,至于网上的微型驱动实现更是一个不个. [曾经找过支持intel显卡的小型操作系统,还真找到了一个,对照intel文档看起来也不算很难.]

显卡驱动方面是十分困难的一部分,osdev上说,完成一个非常完善的nvidia显卡驱动,尤其是对于一个人几个人都是不可能的.

但我还是决定尝试一下,也算作是一个挑战吧,如果到中途因为遇到什么困难而失败了,也当作是抛砖引玉了.


当然,分析的还是Nouveau的内核部分,至于用户态的Nouveau部分目前没有计划.

以linux 3.7中的Nouveau为准,可以参照以下网址:

http://lxr.free-electrons.com/source/drivers/gpu/drm/nouveau?v=3.17


如有错误或用语不当还请大家指正,谢谢!


目录:

1. Nouveau源码分析(

### 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?
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