> For the complete documentation index, see [llms.txt](https://book.bsdcn.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://book.bsdcn.org/man/man9/bus_new_pass.9.md).

# BUS\_NEW\_PASS.9

`BUS_NEW_PASS` — 通知总线 pass 级别已更改

## 名称

`BUS_NEW_PASS`

## 概要

```c
#include <sys/param.h>
#include <sys/bus.h>
```

```c
void
BUS_NEW_PASS(device_t dev)
```

## 描述

`BUS_NEW_PASS` 方法在 pass 级别更改时在每个总线设备上调用，以重新扫描设备树。此方法负责在子总线设备上调用 `BUS_NEW_PASS`，以将重新扫描传播到子设备。它还负责重新探测任何未附加的子设备，并允许当前 pass 的驱动程序识别新的子设备。默认实现由 [bus\_generic\_new\_pass(9)](/man/man9/bus_generic_new_pass.9.md) 提供。

## 参见

[bus\_generic\_new\_pass(9)](/man/man9/bus_generic_new_pass.9.md), [bus\_set\_pass(9)](/man/man9/bus_set_pass.9.md), [device(9)](/man/man9/device.9.md)


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## 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, and the optional `goal` query parameter:

```
GET https://book.bsdcn.org/man/man9/bus_new_pass.9.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

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.