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PCIe Hot Swap Device Driver Part 2


System Interconnect Consideration


The IDT System Interconnect Topology shown in Figure 1 consists of a single x86 based Root Complex Processor (RP) connected to one or more intelligent x86 based Endpoint Processors (EP) via an IDT System Interconnect PCIe switch. An IDT Inter-Domain switch is utilized by each EP to connect them to the downstream ports of the System Interconnect PCIe switch. This topology in conjunction with the IDT System Interconnect Software allows high speed data transfer between any two peers in the system.

Figure 1  IDT System Interconnect Topology

Figure 1  IDT System Interconnect Topology


When a new EP is connected to or disconnected from a system utilizing this type of topology, the Hot-Swap driver treats the EP the same as any normal endpoint device. There is, however, a difference in the way in which an RP is treated when it is connected to or disconnected from the system.

Gigabit ET Dual Port Server Adapter

Gigabit ET Dual Port Server Adapter


Typically, when the upstream port of a PCIe switch is disconnected as shown in Figure 2, the switch will issue a hot reset to all of its downstream ports. This functionality is undesirable in the System Interconnect topology since it would prevent the EPs from communicating with each other when the RP is disconnected from the system. The Hot Swap driver overcomes this issue by detecting IDT PCIe System Interconnect Switches and disabling their ability to generate a hot reset when their upstream ports are disconnected. This functionality may be disabled in the Hot Swap driver by setting the “link Down Hot Reset” module parameter to a non zero value.

Figure 2  System Interconnect  Root Complex Pr ocessor Removal


Figure 2  System Interconnect  Root Complex Pr ocessor Removal


The Hot Swap driver also sports a passive resource allocation algorithm. Used primarily with the IDT System Interconnect Topology, this algorithm allows an RP to be connected to an operational system with minimal system interruption. Typically, when an endpoint device is connected to the Root Complex, it is the Root Complex that assigns memory resources to the device. In the case of passive resource allocation, it is the Root Complex that assigns memory resources to the device. In the case of passive resource allocation, its’ Root Complex, whose memory resources, should be used. This functionality is enabled by default in the Hot Swap driver, but it may be disabled by setting the "passive Allocation Disable” module parameter.


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