CN1202482C - Hot plug interval design method based on compact periphery components interconnecting bus system - Google Patents

Abstract

The present invention discloses a hot plug interruption design method based on a compact peripheral component interconnection bus system, more specifically an ENUM interruption line connection method. In the method, each interruption line of hot plug interruption of each interface board of the system is connected to an interrupt controller of a system board through an independent signal line; thus, when the interface board generates interruption, the system board can directly determine the interface board which generate the interruption, a corresponding interruption processing routine is executed, and a primary lock control line of a hot plug control device of the interface board is set to be Disable. By the proposal of the present invention, system hangs and data processing delay because of the processing of the system to the hot plug interruption of the interface boards can be effectively avoided.

Description

Hot plug interrupt method for designing based on compact periphery components interconnecting bus system

Technical field

The present invention relates to the hot plug interrupt method for designing of computing machine and communication system, relate in particular to hot plug interrupt method for designing based on compact periphery components interconnecting bus (cpci bus) system.

Background technology

CPCI (Compact PCI, PCI:Peripheral Component Interconnect) bus is a kind of industrial control computer bus standard, it is based on the PCI technology, and abides by a series of bus specifications that PICMG (PCI Industrial Computers Manufacturers Group) organizes to set up.In PICMG 2.0 D3.0 versions, the PICMG tissue defines the hot plug interrupt (ENUM) of CPCI system.In the CPCI system, in order to make each veneer of system (refer to peripheral cards Periphery Card or nonsystematic plate Non-system Board, be the veneer that is used to provide external interface and business processing in the CPCI system) cooperating, on its CPCI interface chip (this paper refers in particular to the chip that the interface board local bus links to each other with cpci bus), have some restrictions, limit as " primary side locking " (Primary lockOut).When pci interface chip was in Primary lockOut state, it will respond but can be produced " target device retry " (target retry) configuration cycle not to the address cycle generation response of CPCI system.In addition, because the veneer of system may be in nondeterministic statement, and the definition of existing ENUM can make system that the veneer of nondeterministic statement is inquired about, and the delay that so can cause system data to handle can cause system crash when serious.

For example, according to the regulation of PICMG 2.0 D3.0 standards, the ENUM interrupt line of all veneers connects together in the CPCI system, with reference to figure 2.Therefore receiving ENUM when the CPCI system will work when interrupting according to the following steps: interface board sends ENUM and interrupts, and has no progeny during system board is received, with the status register that reads in proper order on the interface board, produces the interface board that interrupts until finding.The ENUM of interface board interrupts driving generation by pci interface among Fig. 2, and system board is had no progeny in receiving ENUM and will be inquired about the corresponding registers state of pci interface driver.Because system board must repeating query total interface plate (by PCI configuration cycle), until find produce the interface board that ENUM interrupts till.If the situation that exists CPCI side (being primary side) to pin in the interface board of repeating query, promptly pci interface chip is in Primary lockOut state, will cause system board to hang up, even system crash.With the model of Intel Company is that 21554 pci interface chip is an example, chip controls 0 register (Chip Control 0 Register) is arranged in 21554 chips, and this register has one to be " primary side visit locking " (Primary Access lockOut) position.When this position is changed to ' 1 ', 21554 chips will produce " target device retry " (target retry) operation.If system board is initiated PCI configuration cycle to the interface board that is in this state, because interface board produces target retry, system will produce retry (retry) operation on hardware like this.Cpci bus can be in suspended state during the retry, all will cause system crash if repeatedly this situation or system board house dog software are overtime etc.

Summary of the invention

The object of the present invention is to provide a kind of method for designing of the hot plug interrupt based on compact periphery components interconnecting bus system, the system that the processing of using this method can effectively avoid the ENUM owing to system docking mouth veneer to interrupt causes hangs up and data processing postpones.

For achieving the above object, the method for designing based on the hot plug interrupt of compressing periphery components interconnecting bus system provided by the invention comprises:

A. the independent interrupt line of each interface board hot plug interrupt of system is connected respectively to the interruptable controller of system board;

B. when a certain interface board generation hot plug interrupt, system board is determined to produce the interface board that interrupts by interruptable controller, enters corresponding interrupt handling routine then, and it is invalid that " primary side locking " control line that produces the interface board of interruption simultaneously is set to.

Because the present invention will be connected respectively to the interruptable controller of system board based on the ENUM look-at-me line of each interface board in the system of cpci bus, receive among the ENUM when system board like this and have no progeny, just can determine to produce the interface board that interrupts by interruptable controller, thereby prevent that existing hot plug interrupt method is in order to determine to produce the interface board that ENUM interrupts, and visit is in the interface board of Primarylockout state in the repeating query process, thereby the hang-up of the cpci bus that causes reduces system board simultaneously and handles may delaying time of ENUM interruption.

Description of drawings

Fig. 1 is the embodiment process flow diagram of the method for the invention;

The ENUM bus schemes of the original hot plug interrupt of Fig. 2.

The ENUM interrupt line connectivity scenario of the point-to-point that the described embodiment of Fig. 3 Fig. 1 adopts.

Embodiment

For solving prior art problems, the present invention has adopted two measures in fact, and the one, make system board not be configured visit to the interface board that is in Primary lockout state; The 2nd, shorten time of the Primary lockout state of interface board as far as possible.

The present invention is described in further detail below in conjunction with accompanying drawing.

Fig. 1 is the embodiment process flow diagram of the method for the invention.Implement the present invention according to Fig. 1 and need carry out two steps: at first, in order to guarantee that system board is not configured visit to the interface board that is in Primary lockout, just must guarantee system board to the not clear interface board initiation configuration access of state, system is the ENUM interruption which piece interface board produces with regard to locating when interface board produces the ENUM interruption.Therefore, in step 1 interrupt line of each interface board hot plug interrupt of system is connected respectively to the interruptable controller of system board, with reference to figure 3.As shown in Figure 3, after the ENUM interruption changes the connected mode of point-to-point into by original ENUM bus mode, when interface board produces the ENUM interruption, system board can know which piece interface board has produced the ENUM interruption by corresponding interruptable controller, thereby can prevent that system board from conducting interviews to the not clear interface board of state.

Based on step 1, when interface board took place to interrupt, system board was determined to produce the interface board that interrupts by interruptable controller, enters corresponding interrupt handling routine then.If system board received the ENUM of interface board and interrupted and entered interrupt service routine, and interface board has at this moment entered Primary lockOut state because of certain reason (as the people for resetting etc.).Because system board will dock oralia and carry out the PCI configuration operation, can produce the hang-up of cpci bus equally.For preventing the appearance of the problems referred to above, be set to invalid (Disable) at " primary side locking " (Primary lockOut) of step 2 interface board control line, so just can shorten the time that interface board has entered Primary lockOut state, become minimum probability event thereby will produce unusual chance.

Claims (1)

1, a kind of method for designing of the hot plug interrupt based on compact periphery components interconnecting bus system comprises:

A. the independent interrupt line of each interface board hot plug interrupt of system is connected respectively to the interruptable controller of system board;

B. when a certain interface board generation hot plug interrupt, system board is determined to produce the interface board that interrupts by interruptable controller, enters corresponding interrupt handling routine then, and it is invalid that " primary side locking " control line that produces the interface board of interruption simultaneously is set to.

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