WO2015139431A1

WO2015139431A1 - Stable hot plugging driving method and apparatus and hot plugging-supporting equipment

Info

Publication number: WO2015139431A1
Application number: PCT/CN2014/086094
Authority: WO
Inventors: 刘鹏举
Original assignee: 中兴通讯股份有限公司
Priority date: 2014-03-21
Filing date: 2014-09-09
Publication date: 2015-09-24
Also published as: CN104932993A

Abstract

Disclosed are a stable hot plugging driving method and apparatus and hot plugging-supporting equipment, which solve the problem that equipment and system can still operate normally even after repeated, continuous and rapid hot plugging of the equipment capable of supporting hot plugging. The method comprises: detecting the state of a port in which the equipment capable of supporting hot plugging is plugged; and when the detected state of the port is plugged in, scanning the port after a delay of a certain period of time.

Description

Stable hot-swap driving method, device and hot-swapping device

The present invention relates to the field of embedded storage technologies, and in particular, to a stable hot swap drive method, device, and a hot swappable device.

Background technique

Data dumps and backups are essential in any technology area, and portable data storage devices provide a convenient storage interface. As a convenient storage device, CF card has been widely used due to its high storage density, easy programming and reprogramming, fast read/write speed and low cost. The CF card is connected to the host through a connector. The CF card stores data like a disk for users to use. The biggest advantage is that it supports hot swap operation. The CF card hot swap operation mainly solves two problems. The first is how to detect The insertion and removal of the CF card, and the second is how to ensure that the CF card and the system can still work normally after multiple consecutive hot plugging. For the second problem, there is no related solution in the related technology to prove whether the system and the CF card are still in use after continuous rapid multiple insertion and removal, and the system remains stable. Therefore, how to ensure that the CF card and the system still work normally after multiple consecutive hot plugging are technical problems to be solved in this application.

Summary of the invention

The technical problem to be solved by the present invention is to provide a stable hot-swap driving method, device and a hot-swappable device, which can solve the problem that the device and system can still be supported after multiple consecutive rapid hot-plugging of the hot-swappable device The problem of being able to work properly. A stable hot swap drive method includes:

The state in which the port supporting the hot plug device is inserted is detected; when the detected state of the port is the insertion, the port is scanned for a certain time delay. Preferably, in the step of performing scanning processing on the port for a certain period of time, the delay time is greater than or equal to 2 seconds.

Preferably, when detecting that the state of the port is unplugged, the port is immediately scanned.

Preferably, the scanning processing of the port comprises invoking a device scanning function for port scanning processing.

Preferably, the detecting the state in which the hot-swappable port is located includes detecting the state of the port by using an interrupt or a round robin.

Preferably, the hot-swappable device comprises a mouse or a mobile phone that stores a loose disk, a mobile hard disk, a universal serial bus USB interface.

A stable hot plug drive device includes: a detection module, a delay module and a processing module; the detection module is configured to: detect a state in which a port that can support the hot plug device is inserted; and the delay module is configured When: the detecting module detects that the state of the port is an insertion, delaying for a certain time;

The processing module is configured to: scan the port after the delay module delays a certain time.

Preferably, the delay module is configured to set a delay of greater than or equal to 2 seconds when the detecting module detects that the state of the port is an insertion.

Preferably, the detecting module further includes a scanning module; the scanning module is configured to: when the detecting module detects that the state of the port is unplugged, immediately scans the port.

A device that supports hot plugging, including a memory, a processor, and a port;

The memory is configured to store the set delay time;

The processor is configured to: detect a state in which a port that can support the hot plug device is inserted, and delay the delay set in the memory when the detected state of the port is an insertion The port is scanned after the time.

Preferably, the processor is further configured to: when the detecting module detects that the state of the port is unplugged, immediately scan the port.

Preferably, the memory storage setting has a delay time of 2 seconds or more.

After detecting the insertion state of the port, the embodiment of the present invention delays a certain period of time, so as to ensure that the resources configured by the system are released in time, and further ensure that after the insertion and extraction operations of the hot-swappable device are performed multiple times in succession. The device and system are still working. BRIEF abstract

1 is a flow chart of a stable hot swap drive method according to a first embodiment of the present invention;

2 is a flowchart of a process after detecting an interrupt signal according to a second embodiment of the present invention; FIG. 3 is a schematic diagram of a module for a stable hot swap drive device according to a third embodiment of the present invention; FIG. 4 is a fourth embodiment of the present invention; FIG. 5 is a schematic diagram of a connection between a CF card and a system CPU according to a fifth embodiment of the present invention; FIG. 6 is a schematic diagram of obtaining SATA port information according to a fifth embodiment of the present invention; Post-processing method flow chart. Preferred embodiment of the invention

The embodiments of the present invention are described in detail below with reference to the accompanying drawings, and the features of the embodiments and the embodiments of the present invention can be arbitrarily combined with each other without conflict. The embodiment of the invention detects the state of the port that can support the hot plugging device, and detects that the port that can support the hot plugging device is inserted, and delays for a certain time. After the delay time ends, further The scanning process is performed on the port. In an embodiment of the invention, the delay time is preferably greater than or equal to 2 s. Compared with the prior art, the application delays a certain time after detecting that the port of the hot-swappable device is inserted, which ensures that the resources allocated by the system are released in time, and the solution is solved. After the hot-swappable device is continuously hot-swapped, the device and system can still work normally. Question.

Embodiment 1:

Figure 1 shows the hot plug method provided in this embodiment, including:

Step 101: The detection inserts a state that supports the port of the plugged device;

Step 102: When the detected state is the insertion, the scanning process is performed on the port that can be inserted into the hot-swappable device.

In step 101, a system startup link is detected before the state in which the hot-swappable device port is supported is inserted, and the system startup link can detect whether there is a hot-swappable device in the system port by means of port scanning, and if so, After the system is started, the corresponding device information can be seen through the related commands. If no, the system can not see the corresponding device information after the system is started. In this embodiment, the port that supports the hot-swappable device is detected. The status is detected by scanning. Of course, it is also possible to detect, at the system port, whether there is a device that can support hot swapping in the system startup process by other possible means.

In this embodiment, the manner of detecting the state in which the hot-swappable device port is inserted is detected in at least one of the following two ways:

The first type: by means of interruption;

Second: through the way of round robin.

In step 102, when it is detected that the state in which the hot-swappable device port is inserted is inserted, the system first powers up the hot-swappable device, and then the system delays for a certain time, when the delay is certain. After the time has elapsed, the system will scan the hot-swappable devices.

In the present embodiment, the delay time is preferably 2s or more, and the delay time is not limited to the time range described in this embodiment.

After the delay time is over, scanning is performed on the port of the device that is inserted to support hot swap. Preferably, the scanning process is device scanning processing, and the device scanning process includes supporting hot plugging. The extracted device is added to the system device, and the system performs the lighting operation. After the scan process is completed, the user can use the device normally.

In step 102, when it is detected that the state in which the hot-swappable device port is inserted is unplugged, no delay processing is required, and the port for inserting the hot-swappable device is directly scanned.

In this embodiment, the device scan processing is performed by calling a device scan function. Preferably, the scan function performs device scan processing under /sys/class/scsi_host/hostx, and of course, other scan methods may be used for scanning processing. In this embodiment, the scanning process for inserting the port capable of supporting the hot plug device is a rescan process.

In this embodiment, the supportable hot plug device preferably includes a storage disc, a mobile hard disk, a mouse connected to the USB interface, a mobile phone, etc., and the storage disc may further include a CF card, a U disk, a TF card, and the like. A device that exchanges data via a USB interface or connects to a USB interface through a device such as a card reader to exchange data. The hot-swappable device is not limited to the ones described above in the embodiment, and any device that can be hot-swapped through a USB interface or other interfaces is within the scope of the present application.

In this embodiment, when it is detected that the port of the device capable of supporting hot plugging is in the inserted state, the delay is delayed for a certain period of time, and the main purpose of increasing the delay time is as follows: First, the system is ready to perform scanning processing on the device. The second is to ensure that the resources allocated by the system can be released in a timely manner. Using the method in this embodiment, it is ensured that the device and system can still work normally after multiple consecutive hot swapping of the hot-swappable devices.

Embodiment 2:

In this embodiment, it is preferable to detect the state in which the hot-swappable device can be supported by the interrupt mode. FIG. 2 is a flowchart of the process after the system detects the interrupt signal in the embodiment:

Step 201: detecting an interrupt signal, proceeding to step 202;

Step 202: Determine whether the interrupt signal is an insertion signal. If yes, go to step 203. If no, Go to step 204;

Step 203: delay a certain period of time, and after the delay time ends, scan the port inserted with the hot-swappable device;

Step 204: Scan the port with the hot-swappable device.

In step 201, a port scan is required before detecting that an interrupt signal is generated. When a port scan process detects that a hot-swappable device exists on the port, an interrupt signal is immediately generated to the system.

In step 202, after the system receives the interrupt signal, further detecting whether the interrupt signal is an insertion signal, if yes, proceeding to step 203; if not, proceeding to step 204;

In step 203, before the delay is delayed, the supportable hot plug device needs to be powered on, and after the delay time ends, the device port is again scanned, and the scan process includes device scan processing, device scan processing. After the completion, the hot-swappable devices are added to the system device tree, and the system performs lighting operations.

In step 204, after the re-scanning process is completed, the device can be powered off, and then the device is powered off. The scanning process in this step includes the hot-swappable device from the system device tree. Remove, the system does the light-off operation.

Embodiment 3:

3 is a schematic diagram of a hot plug device module according to the embodiment, including: a detection module 301, a delay module 302, and a processing module 303;

The detecting module 301 is configured to detect a state in which the port that can support the hot plugging device is inserted; the delay module 302 is configured to delay when the detecting module 301 detects that the state in which the hot pluggable device port is inserted is inserted. Time

The processing module 303 is configured to perform scanning processing on the port that can be supported by the hot-swappable device after the delay of the module 302 to be delayed.

In this embodiment, the detecting module 301 detects the state in which the port supporting the hot plug device is inserted. There is also a system startup link. The system startup link can detect whether there is a hot-swappable device in the system port through port scanning. If yes, the corresponding device information can be seen through the relevant commands after the system is started; if not, then After the system is started, the corresponding device information cannot be seen through the relevant commands. Of course, it is also possible to detect whether there is a hot-swappable device at the system port in the system startup link. In this embodiment, detecting that the port supporting the hot-swappable device is inserted is Detected by scanning. Of course, it is also possible to detect, at the system port, whether there is a device capable of supporting hot plugging in the system startup link by other possible means.

In this embodiment, the detecting module 301 detects that the state in which the hot-swappable device port is inserted is at least one of the following two modes:

The first type: by means of interruption;

Second: through the way of round robin.

When it is detected that the state in which the hot-swappable device port is inserted is the inserted state, the system first powers up the device that can support hot plugging, and then delays the delay by the delay module 302 for a certain period of time. After the end, the processing module 303 performs scanning processing on the device port that is inserted to support hot swap.

After the delay time controlled by the delay module 302 ends, the scanning module 3031 in the processing module 303 performs an operation of performing scanning processing on the port that can support the hot-pluggable device. Preferably, the scanning process is device scanning processing, and the device scans. Processing involves adding hot-swappable devices to the system device, and the system performs lighting operations. After the device scan processing is completed, the user can use the device normally.

When the detecting module 301 detects that the state in which the hot-swappable device port is inserted is unplugged, the delay processing is not required, and the device that directly supports the hot-swappable device port is directly connected. Scan processing, in this embodiment, scanning processing for inserting a port capable of supporting hot plugging is a rescan processing.

In this embodiment, the scanning module 3031 in the processing module 303 performs scanning processing by calling a device scanning function, and preferably performs scanning processing on the device under the /sys/class/scsi_host/hostx device, and of course, other devices may be used. The scanning method is performed by scanning.

In this embodiment, the supportable hot plug device preferably includes a storage disc, a mobile hard disk, a mouse connected to the USB interface, a mobile phone, and the like, and the storage disc further includes a CF card, a U disk, a TF card, and the like. A device that exchanges data directly through a USB interface or connects to a USB interface through a device such as a card reader to exchange data. The hot-swappable device is not limited to the above-mentioned ones in the embodiment, and any device that can implement the hot-swap function through the USB interface or other interfaces belongs to the scope of the present application.

In this embodiment, the detecting module 301 delays a certain time when detecting that the port of the device capable of supporting hot plugging is in the inserted state, and increases the delay time. The first purpose is to let the system scan the device. The first preparation; the second is to ensure that the resources allocated by the system can be released in a timely manner. Using the apparatus of this embodiment, it is ensured that the system can still operate normally after multiple consecutive hot swapping of the supportable hot swappable apparatus.

Embodiment 4:

FIG. 4 is a schematic structural diagram of a hot plug device according to the embodiment, including: a memory and a processor;

The memory is set to store the previously set delay time;

The processor is configured to detect a state in which the port supporting the hot-swappable device is inserted, and when the detected state is an insertion, delaying the delay time set in the memory, inserting a supportable hot-swappable device The port performs scanning processing.

In this embodiment, the processor detects that there is a system startup link before the state in which the hot-swappable device port is supported, and the system startup link can detect whether the system port is in the port through the port scanning manner. There is a device that can support hot swap. If yes, the corresponding device information can be seen through the related commands after the system is started. If no, the corresponding device information cannot be seen after the system is started. Of course, it is also possible to detect whether there is a hot-swappable device at the system port in the system startup link. In this embodiment, detecting that the port supporting the hot-swappable device is inserted is Detected by scanning. Of course, it is also possible to detect, at the system port, whether there is a device capable of supporting hot plugging in the system startup link by other possible means. .

In this embodiment, the manner in which the processor detects the state in which the hot-swappable device port is inserted includes at least one of the following two modes:

The first type: by means of interruption;

Second: through the way of round robin.

When it is detected that the state in which the hot-swappable device port is inserted is inserted, the system first powers up the device that can support hot plugging, and then delays for a certain time. When the delay is over, the processor ends. Scan the device port that is plugged with hot swappable again.

After the delay time ends, the processor further performs an operation of performing scanning processing on the port that can support the hot-swappable device. Preferably, the scanning process is a device scanning process, and the device scanning process includes adding a device that can support hot plugging. In the system equipment, the system performs lighting operations. After the device scan processing is completed, the user can use the device normally.

When the processor detects that the state of the hot-swappable device port is plugged in, the delay processing is not required, and the port that can be supported by the hot-swappable device is directly scanned, in this implementation. In the example, the scan processing is performed on the port that can be inserted into the hot-swappable device for rescan processing.

In this embodiment, the processor performs a device scanning process by calling a device scan function, and preferably performs a scan function for scanning processing under /sys/class/scsi_host/hostx, and of course, can also be used. Other scanning methods are used for scanning processing.

In this embodiment, the supportable hot plug device preferably includes a storage disc, a mobile hard disk, a mouse connected to the USB interface, a mobile phone, and the like, and the storage disc further includes a CF card, a U disk, a TF card, and the like. A device that exchanges data directly through a USB interface or connects to a USB interface through a device such as a card reader to exchange data. . The hot-swappable device is not limited to the above-mentioned ones in the embodiment, and any device that can implement the hot plug function through the USB interface or other interfaces belongs to the scope of the present application.

In this embodiment, when the processor detects that the port of the device capable of supporting hot plugging is in the inserted state, the processor delays a certain time, and the main purpose of increasing the delay time is as follows: First, let the system perform the scanning process on the device before performing the scanning process on the device. The second is to ensure that the resources allocated by the system can be released in a timely manner.釆 With the hot plugging device in this embodiment, after the device is continuously hot swapped, the device and the system can still work normally.

Preferably, the hot plug device in the present application can be used independently or can be loaded inside other devices to achieve the same hot plug function.

Embodiment 5:

In order to further explain the present application, in the present embodiment, a CF card capable of supporting hot plugging operation will be described in detail.

In this application, referring to FIG. 5, the connection between the CF card and the system CPU provided in this embodiment is performed. In this embodiment, the CF card end is connected to the SATA interface of the CPU through the IDE interface through a bridge chip. The bridge chip is the connector of the SATA TO IDE. In this embodiment, SATA TO IDE bridge chip is used to realize high-speed bidirectional data transmission by serializing data or parallelizing high-speed signals between SATA and IDE.

Of course, the connection between the CF card and the system CPU is not limited to the SATA interface and the IED interface in the embodiment, and may be a SATA interface and a SCSI interface or a SCSI interface and an IDE interface, as long as the data between the CF card and the CPU is implemented. Better transmission, the connector between the two ends of the interface It is not limited to the SATA TO IDE bridge in this application, but may be other chips with a connector function.

In this embodiment, since the CF card is connected to the CPU through the bridge, the CF card uses the True IDE mode.

In this embodiment, preferably, during system startup, the system scans each port of the SATA. If the CF card is already in place, the system can see the information of the CF card by using the fdisk-1 command. When the CF card is not found in the scanning process, the fdisk-1 command in the system does not see the information in the CF card. In this embodiment, the SATA driver is preferably used for port scanning.

In this embodiment, referring to FIG. 6, the process after obtaining the SATA port information includes preparation before scanning;

When the CF card is inserted into the card slot, it is detected that the SATA port generates a CF card insertion interrupt signal. The CF card is powered on first, and then the CPU delays for a certain period of time. In this embodiment, the preferred time delay is 2s. After the delay is over, the system re-scans the SATA port through the SATA driver. After the scan is finished, the CF card is added to the system device tree, and then lights up, and then the user can use it normally.

In this embodiment, the part scanned by the device is implemented based on the mechanism and command of the SCSI hard disk scanning, that is, the SCSI scan is run through the attribute setting under the /sys, that is, the SCSI device can be rescanned by writing the corresponding parameter to the scan. . The command is as follows:

# cd /sys/class/scsi_host/hostx/(x means host number);

# echo '- ' > scan;

'——, represents channel, target and lun number. The above command will cause all channels, target and visible lun under hostO to be swept.

In this embodiment, in order to make the work command have a reasonable execution, the delay work queue is used to implement the scheduling of the work command, that is, queue-delay-work(struct workqueue_struct *wq, struct delayed_work *dwork, Unsigned long delay) , dwork until the clock specified by delay It will not be executed until the beat is used up.

When the CF card is removed from the card slot, it detects that the SATA port generates a CF card pull-out interrupt signal, then the system does not perform delay processing, directly calls the relevant function to re-scan the device, and simultaneously performs the light-off operation.

In this embodiment, the use of the hot plug method is introduced by using a specific example. The hot plug method in this embodiment can ensure that the CF card and the system can still be used after the CF card is continuously hot swapped. Normal work, that is, to ensure that the CF card and system work status is still undetermined.

The above is a further detailed description of the present invention in connection with the specific embodiments, and it is not intended that the specific embodiments of the invention are limited to the description. It will be apparent to those skilled in the art that the present invention may be practiced without departing from the spirit and scope of the invention.

Industrial applicability

After detecting the insertion state of the port, the embodiment of the present invention delays a certain period of time, so as to ensure that the resources configured by the system are released in time, and further ensure that after the insertion and extraction operations of the hot-swappable device are performed multiple times in succession. The device and system are still working.

Claims

claims

1. A stable hot-swap driver method, including:

Detect the status of ports with hot-swappable devices plugged into them;

When the detected state of the port is insertion, the scanning process of the port is delayed for a certain period of time.

2. The stable hot-swap driving method as claimed in claim 1, wherein in the step of delaying scanning the port for a certain period of time, the delay time is greater than or equal to 2 seconds.

3. The stable hot-plug driving method according to claim 1, wherein when it is detected that the state of the port is unplugged, the port is scanned immediately.

4. The stable hot-plug driving method according to any one of claims 1 to 3, wherein the scanning of the port includes calling a device scan function to perform port scanning.

5. The stable hot-swappable driving method according to any one of claims 1-3, wherein the state of the detected device is detected.

6. The stable hot-swappable driving method according to claim 5, wherein the hot-swappable device includes a storage disk, a mobile hard disk, a mouse or a mobile phone with a Universal Serial Bus USB interface.

7. A stable hot-swap driving device, including: a detection module, a delay module and a processing module; the detection module is configured to: detect the state of a port that is inserted with a device that can support hot-swapping; the delay The module is set as follows: when the detection module detects that the state of the port is plugged in, it delays for a certain period of time;

The processing module is configured to scan the port after the delay module delays for a certain period of time.

8. The stable hot-swappable drive device according to claim 7, wherein the delay module is configured to delay for a time greater than or equal to 2 seconds when the detection module detects that the state of the port is plugged in.

9. The stable hot-swappable drive device according to claim 7, wherein the detection module further includes a scanning module; the scanning module is configured to: when the detection module detects that the state of the port is unplugged , then the port will be scanned immediately.

10. A device that supports hot plugging, including a memory, a processor, and a port; the memory is set to store a set delay time;

The processor is configured to: detect the state of a port that is plugged into a device that supports hot-swappable devices; when the detected state of the port is plugged in, delay the delay time set in the memory and then The port mentioned above is scanned.

11. The device of claim 10, wherein,

The processor is further configured to: when the detection module detects that the state of the port is unplugged, immediately scan the port.

12. The device of claim 10, wherein,

The delay time of the memory storage setting is greater than or equal to 2 seconds.