WO2022166170A1

WO2022166170A1 - Method, apparatus, and device for device enumeration for pcie interface, and storage medium

Info

Publication number: WO2022166170A1
Application number: PCT/CN2021/114221
Authority: WO
Inventors: 王辉
Original assignee: 深圳市广和通无线股份有限公司
Priority date: 2021-02-04
Filing date: 2021-08-24
Publication date: 2022-08-11
Also published as: CN112835839A

Abstract

A method, apparatus, computer device for device enumeration for a PCIe interface, and a computer-readable storage medium. The method comprises: while a PCIe endpoint is in a kernel stage of booting and startup, detecting a physical link state of a PCIe interface; insofar as the physical link state is no connection established, detecting for a preset enumeration signal via the PCIe interface, keeping a device enumeration resource from being released, and continuing to complete the booting and startup of the PCIe endpoint; and when the preset enumeration signal transmitted by a PCIe root complex is detected, utilizing the device enumeration resource to complete the enumeration of the PCIe interface with the PCIe root complex. The present invention avoids a case in which enumeration can no longer be completed once the enumeration during the power-on and booting of a PCIe device is missed; moreover, by detecting the preset enumeration signal, the PCIe root complex is allowed to complete simultaneous enumerations at any time, thus avoiding strong reliance on different host architectures, and reducing the requirement on timing control with respect to the PCIe root complex.

Description

Device enumeration method, device, device and storage medium for PCIe interface

This application claims the priority of the Chinese patent application with the application number 202110155005.1 and the invention titled "Device Enumeration Method, Device, Device and Storage Medium for PCIe Interface" filed with the China Patent Office on February 4, 2021, the entire contents of which are Incorporated herein by reference.

technical field

The present invention relates to the field of communication technologies, and in particular, to a device enumeration method, apparatus, computer device, and computer-readable storage medium for a PCIe interface.

Background technique

With the development of science and technology in modern society, high-speed communication technology between computers (PCs) has been widely used. PCIe (peripheral component interconnect express, a high-speed serial computer expansion bus standard) interface was first used as an expansion slot interface on a PC to transmit data between high-speed interface devices; with the advent of the 5G era, in order to better In order to meet the needs of the network for big data transmission, the 5G communication module needs to use the PCIe interface for data transmission, and the hardware characteristics of the PCIe interface determine the characteristics of its high-speed communication interface.

The hardware characteristics of the PCIe interface also determine the specific conditions required for its enumeration and adaptation. Since the PCIe interface is an end-to-end connection topology, first there must be a peer PCIe device; secondly, the two PCIe devices must belong to In its own interface working mode, one PCIe device is used as the PCIe host (Root Complex), and the other PCIe device is used as the PCIe device end (Endpoint). The enumeration of the last two PCIe devices requires synchronization timing control requirements.

At present, when the PCIe device is connected to various types of PCIe hosts, the PCIe host needs to initiate a specific enumeration timing control signal; that is, when the PCIe device needs to adapt to the PCIe host, it will The host architecture type of the PCIe host side to adjust the timing matching problem. Taking the Qualcomm platform 5G M.2 package module (a 5G communication module) as the PCIe device side as an example, when the PCIe host side is of the x86 architecture with BIOS control, the PCIe device side needs to adapt to the bus device scan of the BIOS of the PCIe host side Action; when the type of the PCIe host side is the embedded ARM architecture, the PCIe device side needs to adapt to the bus device scanning action when the kernel driver of the PCIe host side is loaded; when the PCIe host side is some special host, its booting has multiple stages. Segment loading, the power-on and port enumeration of the PCIe interface are not in the same stage, and the enumeration is performed when needed.

In the prior art, the device enumeration of the PCIE interface is shown in FIG. 1. For each specific host, the enumeration of the device is required to be completed during the power-on process of the PCIe device end; If the enumeration is performed, the corresponding resources (such as clock resources) are released, and the enumeration can no longer be completed. The timing requirements on the PCIe host side are relatively high; and each time a different type of PCIe host side is adapted, it is cumbersome and time-consuming. Debugging, and the timing of each debugging is not fully compatible with applications in different scenarios on the PCIe host side, which greatly increases labor costs and is inefficient.

Therefore, how to avoid the strong dependence of the device enumeration of the PCIe interface on different host architectures, reduce the manual debugging cost for different hosts, and improve the enumeration efficiency is an urgent problem to be solved today.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a device enumeration method, device, computer equipment and computer-readable storage medium for PCIe interface, so as to avoid strong dependence on different host architectures, reduce manual debugging costs, and improve enumeration efficiency.

In order to solve the above technical problems, the present invention provides a device enumeration method for a PCIe interface, including:

The PCIe device side detects the physical link status of the PCIe interface in the kernel stage of booting;

When the physical link state is that the connection is not established, the preset enumeration signal is detected through the PCIe interface and the device enumeration resource is kept from being released, and the booting of the PCIe device end is continued to be completed;

After detecting the preset enumeration signal sent by the PCIe host, use the device enumeration resource to complete the enumeration of the PCIe interface with the PCIe host.

Optionally, before detecting the physical link state of the PCIe interface, the PCIe device side further includes:

The PCIe device side configures the device tree and selects the PCIe device side mode in the preset booting stage.

Optionally, when the PCIe device side is specifically a Qualcomm 5G M.2 package module, the preset boot-up stage is specifically the SBL stage of boot-up.

Optionally, the method further includes:

When the preset enumeration signal is not detected, the physical link state is detected at preset time intervals;

When the state of the physical link is that the connection is not established, the device enumeration resource is kept not released, and the preset enumeration signal is detected through the PCIe interface.

Optionally, the method further includes:

When the physical link state is that the connection is not established, a preset enumeration preparation signal is output through the PCIe interface.

Optionally, the PCIe interface outputs a preset enumeration preparation signal, including:

The preset signal of the PCIe interface is adjusted to a low level; wherein, the preset enumeration preparation signal is the preset signal of a low level.

Optionally, when the PCIe device end is specifically a Qualcomm 5G M.2 package module, the preset signal is specifically a PWAKE# signal, and the preset enumeration signal is specifically a PERST# interrupt signal.

The present invention also provides a device enumeration device for a PCIe interface, which is applied to a PCIe device, including:

The link detection unit is used to detect the physical link status of the PCIe interface in the kernel stage of booting;

a signal detection unit, configured to detect a preset enumeration signal through the PCIe interface and keep the device enumeration resource from being released when the physical link state is that the connection is not established, and continue to complete the booting of the PCIe device end;

The enumeration unit is configured to use the device enumeration resource to complete the enumeration of the PCIe interface with the PCIe host after detecting the preset enumeration signal sent by the PCIe host.

The present invention also provides a computer device, comprising:

memory for storing computer programs;

The processor is configured to implement the steps of the device enumeration method for the PCIe interface as described above when executing the computer program.

The present invention also provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the steps of the device enumeration method for a PCIe interface as described above are implemented .

A device enumeration method for a PCIe interface provided by the present invention includes: the PCIe device end detects the physical link state of the PCIe interface in the kernel stage of booting; when the physical link state is that the connection is not established, the PCIe interface Detect the preset enumeration signal and keep the device enumeration resources not released, and continue to complete the booting of the PCIe device; after detecting the preset enumeration signal sent by the PCIe host, use the device enumeration resources to complete PCIe with the PCIe host enumeration of interfaces;

It can be seen that the present invention detects the preset enumeration signal through the PCIe interface and keeps the device enumeration resources from being released when the physical link state of the PCIe interface is detected as the connection is not established in the kernel stage of the booting of the PCIe device side, so as to avoid missing PCIe When the enumeration of the device is powered on and turned on, the enumeration cannot be completed; and after detecting the preset enumeration signal sent by the PCIe host, the device enumeration resource is used to complete the enumeration of the PCIe interface with the PCIe host. , so that the PCIe host side can complete the synchronous enumeration action at any time by initiating a preset enumeration signal, avoiding strong dependence on different host architectures, reducing the timing control requirements for the PCIe host side, and reducing manual debugging costs , which improves the enumeration efficiency. In addition, the present invention also provides a device enumeration device for a PCIe interface, a computer device and a computer-readable storage medium, which also have the above beneficial effects.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only It is an embodiment of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to the provided drawings without creative work.

1 is a schematic diagram of a device enumeration method for a PCIe interface in the prior art;

2 is a flowchart of a device enumeration method for a PCIe interface provided by an embodiment of the present invention;

3 is a schematic diagram of a device enumeration method for a PCIe interface provided by an embodiment of the present invention;

4 is a flowchart of another device enumeration method for a PCIe interface provided by an embodiment of the present invention;

5 is a schematic flowchart of another device enumeration method for a PCIe interface provided by an embodiment of the present invention;

6 is a structural block diagram of a device enumeration device for a PCIe interface provided by an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of a computer device according to an embodiment of the present invention.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments These are some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Please refer to FIG. 2 , which is a flowchart of a method for enumerating devices of a PCIe interface according to an embodiment of the present invention. The method can include:

Step 101: The PCIe device side detects the physical link state of the PCIe interface in the kernel stage of booting.

Wherein, the PCIe device end in this embodiment may be a PCIe device (such as a 5G communication module) with a PCIe interface, and when the PCIe device is connected to another PCIe device through the PCIe interface, the PCIe device serves as the PCIe device end, Connect another PCIe device as the PCIe host side.

Specifically, the specific device type of the PCIe device side in this step can be set by the designer according to practical scenarios and user needs. For example, the PCIe device side can be a 5G communication module, such as a Qualcomm 5G M.2 package module, that is, Qualcomm 5G The M.2 package module can be used as the PCIe device side to complete the enumeration of the PCIe interface with the PCIe host side.

It can be understood that the purpose of this step can be that the PCIe device side can determine whether the physical link of the PCIe interface has established a connection (Linkup) by detecting the physical link status of the PCIe interface on the PCIe device side in the kernel stage of booting, that is, Whether the enumeration of the PCIe device has been completed; thus, when the physical link status is the establishment of the connection, it is determined that the timing of the PCIe host has been adapted and the PCIe information of the PCIe device has been recognized, and the enumeration of the PCIe device has been completed; When the state is that the connection is not established, it is determined that the timing of the PCIe host side is not adapted to the PCIe information recognized by the PCIe device side.

Specifically, in this step, the PCIe device side can use the driver (such as the PCIe driver) set in the kernel to detect the physical link status of the current PCIe interface when booting to the kernel stage with the official software version; if the physical link status is to establish a connection (Linkup), that is, the enumeration of the PCIe device has occurred, then continue to complete the booting of the PCIe device side; if the physical link status is that the connection is not established, step 102 may be entered.

It should be noted that the device enumeration method for the PCIe interface provided in this embodiment can be applied to the PCIe device side, that is, the PCIe device serving as the PCIe device side can execute the method provided in this embodiment, and another PCIe device serving as the PCIe host side can execute the method provided in this embodiment. The device establishes the physical link connection of the PCIe interface and completes the enumeration of the PCIe interface. Correspondingly, before this step, the PCIe device may also determine the working mode of the PICe interface; when the working mode of the PICe interface is the PCIe device end mode, enter this step; wherein, the PICe interface working mode may be the PCIe device end mode or the PCIe host mode;

That is to say, the PCIe device can determine whether it is the PCIe device side or the PCIe host side by determining the working mode of the PICe interface. Specifically, the specific way for the PCIe device to determine the working mode of the PICe interface can be set by the designer according to practical scenarios and user requirements. For example, it can be implemented in the same or similar way as the method for determining the working mode of the PICe interface in the prior art; In order to further facilitate the PCIe device to determine the working mode of the PICe interface, the PCIe device serving as the PCIe device side in this embodiment can configure the device tree in the preset boot phase (such as the SBL phase) before the kernel phase of booting, and select the PCIe device side ( Endpoint) mode; through the process of configuring the device tree added in the preset startup phase, the PCIe device serving as the PCIe device end can directly determine itself as the PCIe device end.

Step 102 : when the physical link state is that the connection is not established, the preset enumeration signal is detected through the PCIe interface and the device enumeration resource is kept from being released, and the booting of the PCIe device is continued.

It can be understood that the purpose of this step can be that the PCIe device side detects the preset enumeration signal of the PCIe interface when the physical link state of the PCIe interface is not established, that is, when no valid enumeration of the PCIe device is found. Determine whether the PCIe host side currently needs to enumerate the PCIe device; by keeping the device enumeration resources (such as clock resources) not released, the enumeration can be quickly completed when the preset enumeration signal is detected subsequently, avoiding the prior art. The PCIe host side misses the enumeration of the power-on and startup of the PCIe device side, and cannot complete the enumeration; and by continuing to complete the boot-up of the PCIe device side, the normal completion of the PCIe device side startup is ensured, avoiding PCIe devices. The PCIe interface completes the dependence of enumeration of the PCIe interface in the boot phase, so that the PCIe device end can still enumerate the PCIe interface after the boot is completed.

Specifically, in this step, the specific method for the PCIe device side to detect the preset enumeration signal through the PCIe interface, that is, the specific signal setting of the preset enumeration signal of the PCIe interface, can be set by the designer according to practical scenarios and user requirements. For example, when the PCIe device side is a Qualcomm 5G M.2 package module, the preset enumeration signal can be specifically the PERST# interrupt signal, that is, the PCIe device side can register the PERST# interrupt interface of the PCIe interface, and when the PCIe host side detects that the PCIe host side passes the PCIe When the PERST# interrupt signal is sent by the interface, it is determined that the PCIe host needs to enumerate the PCIe device.

Correspondingly, in the case where the preset enumeration signal sent by the PCIe host side is not detected in this step, the preset enumeration signal can be detected again through the PCIe interface after a preset time, such as detecting the PCIe interface at a preset time interval. Physical link status; when the physical link status is that the connection is not established, continue to keep the device enumeration resources not released, and detect the preset enumeration signal through the PCIe interface, so as to periodically query the physical link status of the PCIe interface, and check the preset enumeration signal. Set the enumeration signal for timing detection; or directly preset the time interval to detect the preset enumeration signal through the PCIe interface. This embodiment does not impose any limitation on this.

Further, the method provided in this embodiment may further include outputting a preset enumeration preparation signal through the PCIe interface when the physical link state is that the connection is not established, so as to output the preset enumeration preparation signal to the PCIe host side, The information that the PCIe interface on the PCIe device side is ready is notified to the PCIe host side, reminding the PCIe host side that a preset enumeration signal can be sent at any time to complete the synchronous enumeration action.

Step 103: After detecting the preset enumeration signal sent by the PCIe host, use the device enumeration resource to complete the enumeration of the PCIe interface with the PCIe host.

It can be understood that, in this step, the PCIe device side can determine that the PCIe host side currently needs to perform PCIe device enumeration after detecting the preset enumeration signal sent by the PCIe host side, so that the device enumeration resources can be used to perform PCIe device enumeration. The training of the physical link of the interface is completed, and the enumeration of the PCIe interface on the PCIe host side is completed after the training is completed.

Correspondingly, as shown in Figure 3, the PCIe host side (PCIe host A or PCIe host B) can initiate a preset enumeration signal through the PCIe interface whenever the PCIe interface needs to be used, and use the enumerated host timing adaptation to identify PCIe. The PCIe information on the device side completes the enumeration of the PCIe device, so that the PCIe host side of different architecture types only needs to ensure that the kernel driver enumeration of the PCIe device side is synchronously adapted, and there are no strict requirements on the timing of the PCIe host side at other times. The enumeration is completed during the boot phase of the PCIe host side, and the enumeration can also be completed when the PCIe host side needs to use the PCIe interface, which increases flexibility.

Specifically, in this embodiment, after determining that the PCIe device side has completed the preparation for enumeration, the PCIe host side may initiate a preset enumeration signal through the PCIe interface to trigger the enumeration of the PCIe interface, so as to ensure the enumeration success rate of the PCIe interface. For example, after receiving the preset enumeration preparation signal through the PCIe interface or after starting the device for a certain period of time, the PCIe host side can initiate the enumeration of the PCIe interface by initiating the preset enumeration signal through the PCIe interface.

In this embodiment, the embodiment of the present invention detects the preset enumeration signal through the PCIe interface and keeps the device enumeration resources from releasing when it is detected that the physical link state of the PCIe interface is not established in the kernel stage of the booting of the PCIe device. , to avoid missing the enumeration when the PCIe device is powered on, and the enumeration cannot be completed; and after detecting the preset enumeration signal sent by the PCIe host, the device enumeration resources are used to complete the enumeration with the PCIe host. The enumeration of the PCIe interface enables the PCIe host side to complete the synchronous enumeration action at any time by initiating a preset enumeration signal, avoiding the strong dependence on different host architectures and reducing the timing control requirements for the PCIe host side. The manual debugging cost is reduced and the enumeration efficiency is improved.

Please refer to FIG. 4 , which is a flowchart of another method for enumerating devices of a PCIe interface according to an embodiment of the present invention. The method can include:

Step 201 : the PCIe device side configures the device tree in the preset booting stage, and selects the PCIe device side mode.

Wherein, the preset booting stage in this step may be a preset booting stage before the kernel stage in the booting process of the PCIe device side.

Specifically, the specific settings of the preset startup stage in this step can be set by the designer according to practical scenarios and user needs. For example, when the PCIe device side is a Qualcomm 5G M.2 package module, the preset startup stage can be It is the SBL (Second BootLoader stage, the second boot stage) stage of the boot-up of the Qualcomm 5G M.2 package module. When the Qualcomm 5G M.2 package module is powered on with the official software version, the device tree can be configured in the SBL stage, and the PCIe device side can be selected. (Endpoint) mode; as shown in Figure 5, this embodiment enables the Qualcomm 5G M.2 package module to determine that it can be used as a PCIe device end through the process of configuring the device tree added in the SBL stage of the Qualcomm 5G M.2 package module.

Step 202: Detect the physical link state of the PCIe interface in the kernel stage of booting.

Specifically, in this step, when the PCIe device is powered on to the kernel stage, the driver (such as the PCIe driver) set in the kernel can be used to detect the physical link status of the current PCIe interface; if the physical link status of the PCIe interface is Linkup , it can be determined that the enumeration of the PCIe device has occurred, that is, the host timing on the PCIe host side has been adapted to identify the PCIe information on the PCIe device side, such as the PCIe information of the Qualcomm 5G M.2 package module on the PCIe device side.

Step 203: When the physical link state is that the connection is not established, output a preset enumeration preparation signal through the PCIe interface.

It can be understood that the purpose of this step can be that when the PCIe device side detects that the physical link state of the current PCIe interface is not established, that is, when no valid enumeration of the PCIe device is found, control the output of the preset enumeration of the PCIe interface. The ready signal is used to trigger and prompt the PCIe host side that the PCIe device side is ready. After waiting for the PCIe host side to be ready, a preset enumeration signal is initiated.

Specifically, in this step, the specific way for the PCIe device side to output the preset enumeration preparation signal through the PCIe interface can be set by the designer according to practical scenarios and user requirements. For example, the preset enumeration preparation signal can be pulled low or pulled High preset signal of PCIe interface to always trigger PCIe host side. For example, the PCIe device side can adjust the preset signal of the PCIe interface to a low level, that is, pull down the preset signal to always trigger the PCIe host side; wherein, the preset enumeration preparation signal is a preset signal with a low level; correspondingly Yes, the PCIe host and standby end can determine that the PCIe device end has completed preparation for enumeration when detecting a low-level preset signal through the PCIe interface. The preset enumeration ready signal may also be a preset interrupt signal of the PCIe interface. As long as the PCIe device side can output a preset enumeration preparation signal to the PCIe host side through the PCIe interface, which triggers a notification to the PCIe host side that the PCIe device side is ready, this embodiment does not impose any restrictions.

Specifically, when the PCIe device side is a Qualcomm 5G M.2 package module, as shown in Figure 5, the above-mentioned preset signal can be specifically the PWAKE# signal of the PCIe interface. In this step, the kernel of the Qualcomm 5G M.2 package module can drive the Control the PWAKE# signal to be pulled low, so that after the PCIe host side detects the pulled PWAKE# signal through the PCIe interface, it can be determined that the Qualcomm 5G M.2 package module is ready.

Step 204: Detect the preset enumeration signal through the PCIe interface and keep the device enumeration resources from releasing, and continue to complete the booting of the PCIe device.

Step 205: After detecting the preset enumeration signal sent by the PCIe host, use the device enumeration resource to complete the enumeration of the PCIe interface with the PCIe host.

Specifically, step 204 and step 205 are similar to step 102 and step 103, and are not repeated here.

Correspondingly, when the preset enumeration preparation signal is a preset signal for the PCIe interface that often triggers the pull-down or pull-up of the PCIe host side, in this step, the PCIe device end may also stop outputting the preset enumeration preparation signal through the PCIe interface. 5 , when the preset enumeration preparation signal is a pulled PWAKE# signal (ie, the preset signal), the PCIe device side can detect the PERST# interrupt signal triggered by the PCIe host side (ie, the preset enumeration signal). ), control the high PWAKE# signal.

Step 206: When the preset enumeration signal is not detected, the physical link status is detected at preset time intervals.

It can be understood that, in this embodiment, when the preset enumeration signal is not detected, the physical link status of the PCIe interface is detected regularly by detecting the physical link status at preset time intervals, so that the physical link status continues to be undetected. When the connection is established, the preset enumeration signal of the PCIe interface is detected, and until the preset enumeration signal sent by the PCIe host end is detected, the process proceeds to step 205 to complete the enumeration of the PCIe interface.

Specifically, when the PCIe device side is a Qualcomm 5G M.2 package module, as shown in Figure 5, the Qualcomm 5G M.2 package module can detect the PERST# interrupt signal (ie the preset enumeration signal) triggered by the PCIe host side ), regularly detect the physical link status of the PCIe interface, and wait for the PERST# interrupt signal triggered by the PCIe host.

Step 207 : when the physical link state is that the connection is not established, continue to keep the device enumeration resource not released, output a preset enumeration preparation signal through the PCIe interface, and detect the preset enumeration signal.

It can be understood that this step may be that when the PCIe device detects the physical link of the PCIe interface at preset time intervals, each time it detects that the physical link state is not established, continue to keep the device enumeration resources not released, and The preset enumeration signal is detected through the PCIe interface, and the PERST# interrupt signal triggered by the PCIe host end is waited, so that after detecting the preset enumeration signal, the process proceeds to step 205 to complete the enumeration of the PCIe interface.

In this embodiment, the embodiment of the present invention outputs a preset enumeration preparation signal through the PCIe interface when the physical link state is not established, so that the PCIe host can know the PCIe interface of the PCIe device through the preset enumeration preparation signal The information that is ready ensures that the PCIe host can complete the synchronous enumeration action by initiating a preset enumeration signal at any time in the future, ensuring the enumeration success rate of the PCIe interface.

Corresponding to the above method embodiments, the embodiments of the present invention further provide a device enumeration device for a PCIe interface. The device enumeration device for a PCIe interface described below and the device enumeration method for a PCIe interface described above may correspond to each other. Reference.

Please refer to FIG. 6. FIG. 6 is a structural block diagram of a device enumeration device for a PCIe interface according to an embodiment of the present invention. The device is applied to the PCIe device side, and can include:

The link detection unit 10 is used for detecting the physical link state of the PCIe interface in the kernel stage of booting;

The signal detection unit 20 is used to detect the preset enumeration signal through the PCIe interface and keep the device enumeration resource from releasing when the physical link state is that the connection is not established, and continue to complete the booting of the PCIe device end;

The enumeration unit 30 is configured to use the device enumeration resource to complete the enumeration of the PCIe interface with the PCIe host after detecting the preset enumeration signal sent by the PCIe host.

Optionally, the device may also include:

The device tree configuration unit is used to configure the device tree and select the PCIe device side mode in the preset boot stage before the kernel stage.

Optionally, when the PCIe device side is specifically a Qualcomm 5G M.2 package module, the preset startup stage is specifically the SBL stage of startup.

Optionally, the device may also include:

The timing detection unit is used to detect the physical link state at preset time intervals when the preset enumeration signal is not detected;

The signal waiting unit is used to continue to keep the device enumeration resources from releasing when the physical link state is that the connection is not established, and to detect the preset enumeration signal through the PCIe interface.

Optionally, the device may also include:

The signal output unit is configured to output a preset enumeration preparation signal through the PCIe interface when the physical link state is that the connection is not established.

Optionally, the signal output unit may be specifically configured to adjust the preset signal of the PCIe interface to a low level; wherein the preset enumeration preparation signal is a preset signal of a low level.

Optionally, when the PCIe device end is specifically a Qualcomm 5G M.2 package module, the preset signal is specifically the PWAKE# signal, and the preset enumeration signal is specifically the PERST# interrupt signal.

In this embodiment, the embodiment of the present invention utilizes the signal detection unit 20 to detect the preset enumeration signal through the PCIe interface and keep the device when it is detected that the physical link state of the PCIe interface is not established in the kernel stage of booting of the PCIe device side. The enumeration resources are not released, which avoids the situation where the enumeration cannot be completed after the enumeration of the power-on and power-on of the PCIe device side is missed; and the enumeration unit 30 detects the preset enumeration signal sent by the PCIe host side, and uses the device Enumerate resources and complete PCIe interface enumeration with the PCIe host, so that the PCIe host can complete the synchronous enumeration action at any time by initiating a preset enumeration signal, avoiding strong dependence on different host architectures and reducing The timing control requirements for the PCIe host side are reduced, the manual debugging cost is reduced, and the enumeration efficiency is improved.

Corresponding to the above method embodiments, an embodiment of the present invention further provides a computer device, and a computer device described below and a device enumeration method for a PCIe interface described above may refer to each other correspondingly.

Please refer to FIG. 7 , which is a schematic structural diagram of a computer device according to an embodiment of the present invention. The computer equipment may include:

a memory D1 for storing computer programs;

The processor D2 is configured to implement the steps of the device enumeration method for the PCIe interface provided by the above method embodiments when executing the computer program.

That is to say, the device enumeration method of the PCIe interface provided by the above method embodiments can be applied to the computer device provided by this embodiment; correspondingly, the computer device provided by this embodiment may be specifically capable of serving as a PCIe device terminal A module (or module) that implements the device enumeration function of the PCIe interface or a terminal device containing a module, etc. The terminal device can be a mobile terminal and/or a smart device, etc., and the mobile terminal can be a mobile phone, a tablet computer, and a laptop computer. At least one of the smart devices, etc., the smart device may be at least one of a smart watch, a smart refrigerator, a smart speaker, a smart washing machine, a smart TV, etc., and the modules may be a 2G communication module, a 3G communication module, a 4G communication module and a 5G communication module. At least one of communication modules (such as Qualcomm 5G M.2 package modules), etc.

Corresponding to the above method embodiments, embodiments of the present invention further provide a computer-readable storage medium, and a computer-readable storage medium described below and a device enumeration method for a PCIe interface described above may correspond to each other. Reference.

A computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, implements the steps of the PCIe interface device enumeration method in the above method embodiment.

The computer-readable storage medium may specifically be various storable program codes such as a USB flash drive, a removable hard disk, a read-only memory (Read-Only Memory, ROM), a random access memory (Random Access Memory, RAM), a magnetic disk, or an optical disk. computer-readable storage medium.

The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the various embodiments can be referred to each other. For the apparatuses, computer equipment, and computer-readable storage media disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the descriptions are relatively simple, and reference may be made to the descriptions of the methods for related parts.

The device enumeration method, device, computer device, and computer-readable storage medium for a PCIe interface provided by the present invention have been described in detail above. The principles and implementations of the present invention are described herein by using specific examples, and the descriptions of the above embodiments are only used to help understand the method and the core idea of the present invention. It should be pointed out that for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can also be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

A device enumeration method for a PCIe interface, comprising:

The PCIe device side detects the physical link status of the PCIe interface in the kernel stage of booting;

When the physical link state is that the connection is not established, the preset enumeration signal is detected through the PCIe interface and the device enumeration resource is kept from being released, and the booting of the PCIe device is continued;

After detecting the preset enumeration signal sent by the PCIe host, use the device enumeration resource to complete the enumeration of the PCIe interface with the PCIe host.
The device enumeration method for a PCIe interface according to claim 1, wherein the PCIe device end further comprises:

The PCIe device side configures the device tree and selects the PCIe device side mode in the preset booting stage.
The device enumeration method for a PCIe interface according to claim 2, wherein when the PCIe device end is specifically a Qualcomm 5G M.2 package module, the preset boot-up stage is specifically a boot-up SBL stage.
The device enumeration method for a PCIe interface according to claim 1, further comprising:

When the preset enumeration signal is not detected, the physical link status is detected at preset time intervals;

When the state of the physical link is that the connection is not established, the device enumeration resource is kept not released, and the preset enumeration signal is detected through the PCIe interface.
The device enumeration method for a PCIe interface according to any one of claims 1 to 4, further comprising:

When the physical link state is that the connection is not established, a preset enumeration preparation signal is output through the PCIe interface.
The device enumeration method for a PCIe interface according to claim 5, wherein the PCIe interface outputs a preset enumeration preparation signal, comprising:

The preset signal of the PCIe interface is adjusted to a low level; wherein, the preset enumeration preparation signal is the preset signal of a low level.
The device enumeration method for a PCIe interface according to claim 6, wherein when the PCIe device end is specifically a Qualcomm 5G M.2 package module, the preset signal is specifically a PWAKE# signal, and the preset The enumeration signal is specifically the PERST# interrupt signal.
A device enumeration device for a PCIe interface, characterized in that, applied to a PCIe device end, comprising:

The link detection unit is used to detect the physical link status of the PCIe interface in the kernel stage of booting;

a signal detection unit, configured to detect a preset enumeration signal through the PCIe interface and keep the device enumeration resource from being released when the physical link state is that the connection is not established, and continue to complete the booting of the PCIe device end;

The enumeration unit is configured to use the device enumeration resource to complete the enumeration of the PCIe interface with the PCIe host after detecting the preset enumeration signal sent by the PCIe host.
A computer equipment, characterized in that, comprising:

memory for storing computer programs;

The processor is configured to implement the steps of the device enumeration method for the PCIe interface according to any one of claims 1 to 7 when executing the computer program.
A computer-readable storage medium, characterized in that a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, a PCIe interface according to any one of claims 1 to 7 is implemented. The steps of the device enumeration method.