CN114676085B - A CCIX bus control method, device and medium - Google Patents

Abstract

The application discloses a CCIX bus control method, a device and a medium, comprising the following steps: and when the server is detected to meet the preset condition, acquiring the bandwidth demand information of the PCI devices in the server so as to determine how to allocate the CCIX bus bandwidth to each PCI device. And performing bandwidth setting on the CCIX bus according to the bandwidth demand information so as to multiplex the CCIX bus into a PCI bus, thereby improving the resource utilization rate and the data transmission speed. Therefore, the scheme provided by the application can maximally utilize the CCIX bus resources of the CPU to improve the PCI bus data transmission speed by multiplexing the CCIX bus into the PCI bus when the server meets the preset condition.

Description

A CCIX bus control method, device and medium

technical field

The present application relates to the server field, in particular to a CCIX bus control method, device and medium.

Background technique

With the development of multi-core servers, existing ARM servers usually have multiple CPUs, and data transmission is realized between different CPUs through a Cache Coherent Interconnect for Accelerators (CCIX) bus suitable for accelerators, wherein the CCIX bus is a A data transmission method using a layered architecture based on the extension of the PCIe architecture, which can greatly improve the data transmission speed.

When there is an idle CPU in the ARM server, the CCIX bus connected to the idle CPU is also in an idle state, which will cause a waste of computing resources.

It can be seen that how to provide a CCIX bus control method to improve the resource utilization of the CCIX bus between CPUs is an urgent problem to be solved by those skilled in the art.

Contents of the invention

The purpose of this application is to provide a CCIX bus control method, device, and medium to solve the problem of CCIX bus idleness due to CPU idleness, and improve CCIX bus resource utilization.

In order to solve the problems of the technologies described above, the application provides a CCIX bus control method, including:

Determine whether the working status of the server CPU meets the preset conditions;

If the preset condition is met, obtain the bandwidth requirement information of the PCI device;

Perform bandwidth setting on the CCIX bus according to the bandwidth requirement information, so as to multiplex the CCIX bus as a PCI bus.

Preferably, the preset conditions include:

Detecting that there is said CCIX bus in an idle state;

Or detect the CCIX bus control command sent by BIOS.

Preferably, if it is detected that there is the CCIX bus in an idle state, before the step of setting the bandwidth of the CCIX bus according to the bandwidth requirement information, it also includes:

Judging whether the CCIX bus in an idle state is connected to the PCI device;

If it is connected with the PCI device, then perform the step of performing bandwidth setting on the CCIX bus according to the bandwidth requirement information;

If it is not connected to the PCI device, control the switching unit to connect the CCIX bus to the PCI device, and execute the step of setting the bandwidth of the CCIX bus according to the bandwidth requirement information.

Preferably, said performing bandwidth setting on said CCIX bus according to said bandwidth requirement information includes:

Obtain the split setting information of the CCIX bus according to the Riser card connected to the CCIX bus;

performing a split operation on the CCIX bus according to the split setting information.

Preferably, after the step of setting the bandwidth of the CCIX bus according to the bandwidth requirement information, it also includes:

When detecting that the PCI device is in an idle state or obtaining a recovery instruction;

controlling the switching unit to disconnect the CCIX bus from the PCI device and connect it to the CPU.

Preferably, the switching unit is a jumper cap.

In order to solve the above technical problems, the application also provides a CCIX bus control device, including:

A judging module, configured to judge whether the server satisfies a preset condition;

An acquisition module, configured to acquire the bandwidth requirement information of the PCI device if the preset condition is met;

A setting module, configured to perform bandwidth setting on the CCIX bus according to the bandwidth requirement information, so as to multiplex the CCIX bus into a PCI bus.

Preferably, it also includes a switching module, which is used to, before executing the acquisition module,

Judging whether the CCIX bus in an idle state is connected to the PCI device;

If it is connected with the PCI device, execute the setting module;

If it is not connected to the PCI device, control the switching unit to connect the CCIX bus to the PCI device, and execute the setting module.

In order to solve the above technical problems, the application also provides a CCIX bus control device, including a memory for storing computer programs;

The processor is configured to implement the steps of the CCIX bus control method when executing the computer program.

In order to solve the above technical problems, the application also provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the steps of the CCIX bus control method are realized .

The present application provides a CCIX bus control method, including: when it is detected that the server satisfies a preset condition, obtaining bandwidth requirement information of PCI devices in the server, so as to determine how to allocate CCIX bus bandwidth to each PCI device. The bandwidth of the CCIX bus is set according to the bandwidth requirement information, so as to multiplex the CCIX bus into a PCI bus, thereby improving resource utilization and data transmission speed. It can be seen that the solution provided by the present application can maximize the use of CCIX bus resources of the CPU to increase the data transmission speed of the PCI bus by multiplexing the CCIX bus into the PCI bus when the server meets the preset conditions.

In addition, the present application also provides a CCIX bus control device and a medium corresponding to the above method, and the effect is the same as above.

Description of drawings

In order to illustrate the embodiments of the present application more clearly, the following will briefly introduce the accompanying drawings used in the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. As far as people are concerned, other drawings can also be obtained based on these drawings on the premise of not paying creative work.

Fig. 1 is the flowchart of a kind of CCIX bus control method provided by the embodiment of the application;

Fig. 2 (a) is the structural diagram of a kind of CCIX bus control device provided by the embodiment of the application;

Fig. 2 (b) is the structural diagram of another kind of CCIX bus control device provided by the embodiment of the application;

Fig. 3 is the structural diagram of another kind of CCIX bus control device provided by the embodiment of the application;

FIG. 4 is a structural diagram of another CCIX bus control device provided by the embodiment of the present application.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of this application.

The core of the present application is to provide a CCIX bus control method, device and medium to solve the waste of bus resources due to idle CCIX bus and improve the utilization rate of CCIX bus.

In order to enable those skilled in the art to better understand the solution of the present application, the present application will be further described in detail below in conjunction with the drawings and specific implementation methods.

In the ARM server working scenario, there are multiple CPUs in the ARM server to perform computing tasks more quickly. The CPUs are often connected by the CCIX bus to realize data transmission, while the CPU and other devices are mostly connected by the Peripheral Component Interconnect (PCI) bus. The CCIX bus is based on the PCIe specification and can be compatible with the PCIe specification. And compared to the PCI bus, the CCIX bus has a faster transmission speed, which can increase the transmission rate to 25GT/s. However, when there are uninstalled CPUs or CPUs in an idle state, the CCIX bus connected to these CPUs will also be in an idle state, resulting in a waste of bus resources. In order to maximize the use of CCIX bus resources and improve the data transmission speed between different devices in the server, the application provides a CCIX bus control method, when it is detected that the server meets the preset conditions, the bandwidth requirement information of the PCI device in the server is obtained , in order to determine how to allocate CCIX bus bandwidth for each PCI device. The bandwidth of the CCIX bus is set according to the bandwidth requirement information, so as to multiplex the CCIX bus into a PCI bus, thereby improving resource utilization and data transmission speed. It can be seen that the solution provided by the present application can maximize the use of CCIX bus resources of the CPU to increase the data transmission speed of the PCI bus by multiplexing the CCIX bus into the PCI bus when the server meets the preset conditions.

Fig. 1 is the flow chart of a kind of CCIX bus control method provided by the embodiment of the application, as shown in Fig. 1, the method comprises:

S10: Determine whether the working state of the server CPU satisfies a preset condition.

In a specific implementation, the CCIX bus is usually used to implement data transmission between devices. The advantage of the CCIX bus protocol lies in its compatibility with PCI Express. Since the CCIX bus protocol is based on the PCI Express specification, it can be transmitted through the PCI Express link with little or no modification. Further, the CCIX bus protocol can transmit data through any PCI Express link with a running speed of 8GT/s or faster. The maximum data rate specified by the PCI Express4.0 protocol is 16GT/s, and the CCIX bus protocol can pass The transfer rate is increased to 25GT/s, a CCIX link can reach 100GB/s under the same conditions, and two CCIX components communicating with each other can be initialized through the normal PCI Express link (usually a hardware autonomous process ) to achieve the highest mutually supported PCI Express speed.

In order to maximize the use of CCIX bus resources and improve the data transmission speed of the server system, when the working status of the server meets the preset conditions, such as the CCIX bus is idle or the CPU connected to the CCIX bus is idle or the CPU is not installed, or the detection To the CCIX bus control command sent by the BIOS to control the multiplexing of the CCIX bus. Otherwise, it appears that the CCIX bus is in a normal working state, and forcing the CCIX bus to be multiplexed as a PCI bus will affect the data transmission speed and even cause data loss, affecting the normal operation of the server.

S11: If the preset condition is met, obtain bandwidth requirement information of the PCI device.

When it is detected that the working state of the server satisfies the preset condition, it appears that the CCIX bus needs to be multiplexed as the PCI bus to increase the data transmission speed of the PCI device. Since there are multiple PCI devices in the server and the importance and working status of each PCI device are different, in order to improve the data read and write speed of the system as much as possible, it is necessary to determine the bandwidth requirement information of different PCI devices and the importance of the current task of the PCI device, so that Allocate CCIX bus bandwidth to individual PCI devices.

It can be understood that the bandwidth requirement information of the PCI device can be obtained through the bandwidth test script, and the bandwidth requirement information of the PCI device can also be obtained by looking up the table. The former method is more accurate, and the second method is simpler and faster. This application There is no limitation on the manner of obtaining the bandwidth requirement information.

In a specific implementation, determining the importance of the current task of the PCI device includes: calculating the importance of the current task according to the amount of data transmitted by the PCI device and the weight corresponding to the task.

S12: Perform bandwidth setting on the CCIX bus according to the bandwidth requirement information, so as to multiplex the CCIX bus as a PCI bus.

When the CCIX bus is multiplexed as a PCI bus, the bandwidth of the CCIX bus needs to be set according to the bandwidth requirement information, and the CCIX bus is split into buses with different bandwidths to be multiplexed as a PCI bus. Generally, the CCIX bus can be split into buses with bandwidths of X4, X8, and X16 respectively.

It can be understood that the CCIX bus is usually used for data transmission between CPUs, that is, both ends of the CCIX bus are connected to the CPU. Therefore, when the CCIX bus is connected to the CPU and the CCIX bus needs to be multiplexed, it is necessary to disconnect the CCIX bus from the CPU. connection, and connect the CCIX bus to the PCI device that needs to allocate bandwidth.

Fig. 2 (a) is the structural diagram of a kind of CCIX bus control device provided by the embodiment of the present application, and Fig. 2 (b) is the structural diagram of another kind of CCIX bus control device provided by the embodiment of the present application, as shown in Fig. 2 As shown in (a), when the CCIX bus is connected to the CPU1, the CCIX bus is switched to be connected to the PCI device through the switching unit 2 (such as a jumper cap). As shown in Figure 2(b), when CPU1 is not installed or CPU1 is in an idle state, the BIOS system directly multiplexes the CCIX bus as a PCI bus to improve the data transmission speed of PCI devices.

The present application provides a CCIX bus control method, including: when it is detected that the server satisfies a preset condition, obtaining bandwidth requirement information of PCI devices in the server, so as to determine how to allocate CCIX bus bandwidth to each PCI device. The bandwidth of the CCIX bus is set according to the bandwidth requirement information, so as to multiplex the CCIX bus into a PCI bus, thereby improving resource utilization and data transmission speed. It can be seen that the solution provided by the present application can maximize the use of CCIX bus resources of the CPU to increase the data transmission speed of the PCI bus by multiplexing the CCIX bus into the PCI bus when the server meets the preset conditions.

In a specific implementation, when it is necessary to multiplex the CCIX bus into a PCI bus, it is necessary to ensure that the multiplexing operation will not affect the normal transmission of data in the system. Therefore, the multiplexing operation can only be performed when the working state of the server satisfies the preset condition.

On the basis of the foregoing embodiments, the preset conditions include:

An idle CCIX bus is detected;

Or detect the CCIX bus control command sent by BIOS.

It can be understood that a server usually has multiple CPU slots for installing multiple CPUs to perform work tasks. However, when the performance requirements of the server are low, only a single CPU can be installed in the multi-CPU server. At this time, the CCIX bus in the server is in an idle state. In addition, when the CPU connected to the CCIX bus is in an idle state, the amount of data transmitted by the CCIX bus is lower than a preset amount of data, and the CCIX bus may also be determined to be in an idle state.

Further, in a specific implementation, there may be a situation where the task of the PCI device is urgent, and it is necessary to send a control command through the BIOS to force the CCIX bus to be multiplexed as the PCI bus. In this case, the BIOS needs to determine the CCIX bus information and split the CCIX bus according to the riser card connected to the CCIX.

In this embodiment, the preset condition is set to detect that there is an idle CCIX bus; or to detect a CCIX bus control command sent by the BIOS. Ensure that the server can work normally when the CCIX bus is multiplexed, and improve the stability and reliability of the system.

In a specific implementation, since the CCIX bus is usually used for CPU interconnection and data transmission, the CCIX bus is usually connected to the CPU. In this case, the CCIX bus cannot be multiplexed as a PCI bus only through program settings. In order to solve this problem, on the basis of the foregoing embodiments, if it is detected that there is a CCIX bus in an idle state, before the step of setting the bandwidth of the CCIX bus according to the bandwidth requirement information, it also includes:

Determine whether the idle CCIX bus is connected to the PCI device;

If it is connected with the PCI device, then perform the step of setting the bandwidth of the CCIX bus according to the bandwidth requirement information;

If not connected to the PCI device, control the switching unit to connect the CCIX bus to the PCI device, and execute the step of setting the bandwidth of the CCIX bus according to the bandwidth requirement information.

In a specific implementation, the CCIX bus is actively disconnected from the CPU through the switching unit, and the CCIX bus is connected to the PCI device. In a specific implementation, the switching unit may be an electronic switch or a jumper cap. For example, when the switching unit is a jumper cap, the control unit switches the jumper cap from the CCIX link to the PCI link for use, so as to realize multiplexing of the CCIX bus.

As a preferred embodiment, after the step of bandwidth setting is carried out to the CCIX bus according to the bandwidth requirement information, it also includes:

When detecting that the PCI device is in an idle state or obtaining a recovery command;

The control switching unit disconnects the CCIX bus from the PCI device and connects it to the CPU.

When the PCI device connected to the multiplexing CCIX bus is in an idle state (that is, the amount of data transmission is less than the data threshold) or the server system obtains a recovery instruction, the control switching unit disconnects the CCIX bus from the PCI device and connects it to the CPU to end the CCIX Bus multiplexing.

In the present embodiment, by detecting whether the CCIX bus is connected with the PCI device, if not connected, the CCIX bus is connected with the PCI device by a switching unit, to ensure that the CCIX bus multiplexing operation is carried out normally, and improve the stability of the CCIX bus multiplexing method sex. At the same time, when it is detected that the PCI device is in an idle state or a recovery command is obtained, the multiplexing of the CCIX bus is stopped to improve the stability and reliability of the server system.

As a preferred embodiment, performing bandwidth setting on the CCIX bus according to the bandwidth requirement information includes:

Obtain the split setting information of the CCIX bus according to the Riser card connected to the CCIX bus;

Split the CCIX bus according to the split setting information.

In specific implementation, the CCIX bus is split to increase different bandwidths for different PCI devices. Usually, the CCIX bus is split into buses with bandwidths of X4, X8, and X16 to increase the speed at which PCI devices send and receive data.

In the above embodiments, the CCIX bus control method is described in detail, and the present application also provides corresponding embodiments of the CCIX bus control device. It should be noted that this application describes the embodiments of the device part from two perspectives, one is based on the perspective of functional modules, and the other is based on the perspective of hardware.

Fig. 3 is the structural diagram of another kind of CCIX bus control device that the embodiment of the present application provides, as shown in Fig. 3, this device comprises:

Judging module 10, for judging whether the server satisfies the preset condition;

Obtaining module 11, used for obtaining the bandwidth requirement information of PCI equipment if preset conditions are met;

The setting module 12 is configured to set the bandwidth of the CCIX bus according to the bandwidth requirement information, so as to multiplex the CCIX bus into a PCI bus.

In addition, the CCIX bus control device provided in this embodiment further includes: a switching module and a restoring module.

Wherein, the switch module is used to judge whether the CCIX bus in an idle state is connected to the PCI device before executing the acquisition module; if it is connected to the PCI device, the setting module is executed; Connect with the PCI device, and execute the setting module; so as to ensure the normal execution of the CCIX multiplexing operation.

The recovery module is used to detect that the PCI device is in an idle state or obtain a recovery command; the control switching unit disconnects the CCIX bus from the PCI device and connects it to the CPU.

Since the embodiment of the device part corresponds to the embodiment of the method part, please refer to the description of the embodiment of the method part for the embodiment of the device part, and details will not be repeated here.

This embodiment provides a CCIX bus control device, the device includes: when it is detected that the server satisfies the preset condition, the bandwidth requirement information of the PCI devices in the server is obtained, so as to determine how to allocate the CCIX bus bandwidth for each PCI device. The bandwidth of the CCIX bus is set according to the bandwidth requirement information, so as to multiplex the CCIX bus into a PCI bus, thereby improving resource utilization and data transmission speed. It can be seen that the device provided by the present application can maximize the use of CCIX bus resources of the CPU by multiplexing the CCIX bus into the PCI bus when the server meets the preset conditions to improve the data transmission speed of the PCI bus.

Fig. 4 provides the structural diagram of another kind of CCIX bus control device for the embodiment of the present application, as shown in Fig. 4, CCIX bus control device comprises: memory 20, is used for storing computer program;

The processor 21 is configured to implement the steps of the method for acquiring the working status of the server as in the foregoing embodiment when executing the computer program.

The server provided in this embodiment may include, but is not limited to, a smart phone, a tablet computer, a notebook computer or a desktop computer, and the like.

Wherein, the processor 21 may include one or more processing cores, such as a 4-core processor, an 8-core processor, and the like. Processor 21 can adopt at least one hardware form in Digital Signal Processor (Digital Signal Processor, DSP), Field-Programmable Gate Array (Field-Programmable Gate Array, FPGA), Programmable Logic Array (Programmable LogicArray, PLA) accomplish. The processor 21 may also include a main processor and a coprocessor, the main processor is a processor for processing data in the wake-up state, and is also called a central processing unit (Central Processing Unit, CPU); Low-power processor for processing data in standby state. In some embodiments, the processor 21 may be integrated with a graphics processor (Graphics Processing Unit, GPU), and the GPU is used for rendering and drawing the content that needs to be displayed on the display screen. In some embodiments, the processor 21 may also include an artificial intelligence (AI) processor, and the AI processor is used to process calculation operations related to machine learning.

Memory 20 may include one or more computer-readable storage media, which may be non-transitory. The memory 20 may also include high-speed random access memory, and non-volatile memory, such as one or more magnetic disk storage devices, flash memory storage devices. In this embodiment, the memory 20 is at least used to store the following computer program 201, wherein, after the computer program is loaded and executed by the processor 21, it can realize the relevant steps of the CCIX bus control method disclosed in any of the foregoing embodiments. In addition, the resources stored in the memory 20 may also include an operating system 202 and data 203, etc., and the storage method may be temporary storage or permanent storage. Wherein, the operating system 202 may include Windows, Unix, Linux and so on. The data 203 may include but not limited to server working status and so on.

In some embodiments, the CCIX bus control device may further include a display screen 22 , an input/output interface 23 , a communication interface 24 , a power supply 25 and a communication bus 26 .

Those skilled in the art can understand that the structure shown in FIG. 4 does not constitute a limitation to the CCIX bus control device, and may include more or less components than shown in the figure.

The CCIX bus control device provided by the embodiment of the present application includes a memory and a processor. When the processor executes the program stored in the memory, the following methods can be implemented:

Determine whether the working status of the server CPU meets the preset conditions;

If the preset condition is met, obtain the bandwidth requirement information of the PCI device;

Set the bandwidth of the CCIX bus according to the bandwidth requirement information, so as to multiplex the CCIX bus as a PCI bus.

Finally, the present application also provides an embodiment corresponding to a computer-readable storage medium. A computer program is stored on the computer-readable storage medium, and when the computer program is executed by the processor, the steps described in the foregoing method embodiments are implemented.

It can be understood that if the methods in the above embodiments are implemented in the form of software function units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or part of the contribution to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium , executing all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disk or optical disk and other various media that can store program codes. .

The CCIX bus control method, device, and medium provided by this application have been introduced in detail above. Each embodiment in the description is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other. As for the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and for relevant details, please refer to the description of the method part. It should be pointed out that those skilled in the art can make some improvements and modifications to the application without departing from the principles of the application, and these improvements and modifications also fall within the protection scope of the claims of the application.

It should also be noted that in this specification, relative terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that these entities or operations There is no such actual relationship or order between the operations. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or device. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising said element.

Claims (7)

1. A CCIX bus control method, comprising:

judging whether the working state of the CPU of the server meets the preset condition or not;

if the preset condition is met, obtaining bandwidth demand information of the PCI equipment;

performing bandwidth setting on the CCIX bus according to the bandwidth demand information so as to multiplex the CCIX bus into a PCI bus;

the preset conditions include:

detecting the presence of the CCIX bus in an idle state;

or detecting a CCIX bus control instruction sent by the BIOS;

if the CCIX bus in the idle state is detected, before the step of performing bandwidth setting on the CCIX bus according to the bandwidth requirement information, the method further comprises:

judging whether the CCIX bus in an idle state is connected with the PCI equipment or not;

if the CCIX bus is connected with the PCI equipment, executing the step of setting the bandwidth of the CCIX bus according to the bandwidth demand information;

and if the CCIX bus is not connected with the PCI device, controlling the switching unit to enable the CCIX bus to be connected with the PCI device, and executing the step of setting the bandwidth of the CCIX bus according to the bandwidth demand information.

2. The CCIX bus control method of claim 1 wherein said bandwidth setting the CCIX bus according to the bandwidth requirement information includes:

obtaining split setting information of the CCIX bus according to a Riser card connected with the CCIX bus;

and splitting the CCIX bus according to the splitting setting information.

3. The CCIX bus control method according to claim 1, further comprising, after the step of performing bandwidth setting on the CCIX bus according to the bandwidth requirement information:

when the PCI equipment is detected to be in an idle state or a recovery instruction is acquired;

and controlling the switching unit to disconnect the CCIX bus from the PCI device and connect the CCIX bus with the CPU.

4. A CCIX bus control method according to claim 3 wherein the switching unit is a jumper cap.

5. A CCIX bus control device, comprising:

the judging module is used for judging whether the server meets preset conditions or not; the preset condition comprises detecting that the CCIX bus in an idle state exists; or detecting a CCIX bus control instruction sent by the BIOS;

the acquisition module is used for acquiring bandwidth demand information of the PCI equipment if the preset condition is met;

the setting module is used for carrying out bandwidth setting on the CCIX bus according to the bandwidth demand information so as to multiplex the CCIX bus into a PCI bus;

and a switching module for switching the acquisition module to the switching mode,

judging whether the CCIX bus in an idle state is connected with the PCI equipment or not;

if the PCI device is connected with the PCI device, executing the setting module;

and if the CCIX bus is not connected with the PCI device, controlling the switching unit to connect the CCIX bus with the PCI device, and executing the setting module.

6. A CCIX bus control device comprising a memory for storing a computer program;

a processor for implementing the steps of the CCIX bus control method according to any one of claims 1 to 4 when executing said computer program.

7. A computer readable storage medium, characterized in that the computer readable storage medium has stored thereon a computer program which, when executed by a processor, implements the steps of the CCIX bus control method according to any one of claims 1 to 4.

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