# nvdimm初探

最近研究nvdimm，发现这玩意还真有点复杂。

简单记录之。

## 使用手册

写了一半发现得先写个使用手册，这样一来自己做个记录，二来也清楚正常使用流程，三来部分内容可以帮助解释代码。

所以加一个[使用手册](/kernel-exploring/00-brief_navigation/00-brief_user_guide.md)

## 上帝视角

经过了设备模型的洗礼，那就先从总线，驱动和设备角度看看都有些什么。

[上帝视角](/kernel-exploring/00-brief_navigation/01-a_big_picture.md)

## nvdimm\_bus

首先创建的是nvdimm\_bus设备，而且从树形结构中可以看到它是nvdimm设备树的根。

[nvdimm\_bus](/kernel-exploring/00-brief_navigation/02-nvdimm_bus.md)

## nvdimm

在整个设备树中，有一个孤零零的存在:nvdimm。这就是是用来表示物理dimm设备的。

[nvdimm](/kernel-exploring/00-brief_navigation/03-nvdimm.md)

## nd\_region

接着我们就来看nvdimm\_bus下，另一个子树。而这颗子树的根就是nd\_region了。

[nd\_region](/kernel-exploring/00-brief_navigation/04-nd_region.md)

而在nd\_region下，有四个并列的设备：

* [nd\_namespace\_X](/kernel-exploring/00-brief_navigation/05-namespace.md)
* [nd\_btt](https://github.com/RichardWeiYang/kernel_exploring/blob/master/nvdimm/06-btt.md)
* [nd\_pfn](https://github.com/RichardWeiYang/kernel_exploring/blob/master/nvdimm/08-pfn.md)
* [nd\_dax](/kernel-exploring/00-brief_navigation/07-dax.md)

## dev\_dax

在着重描述了namespace和nd\_dax后，终于要到整个驱动的最后也就是[dev\_dax](/kernel-exploring/00-brief_navigation/07-dax/09-dev_dax.md)。

这是用户使用nd\_dax设备的接口。


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://richardweiyang-2.gitbook.io/kernel-exploring/00-brief_navigation.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.