In a multiprocessor system, a method for dynamically establishing an I/O path between a processor node and an I/O device for routing data there between. The method starts with providing a configuration graph. The graph has objects associated with elements (devices) of the system and links connecting the objects. The node is identified, and links are then followed in the graph from an object associated with the I/O device to an object associated with a node. If multiple I/O paths exist and an optimal path is desired, the method includes providing in the links routing information containing nodes that can be directly reached via the link. Links are then followed, if possible, whose routing information contains the identified node. If no link having such routing information exists at an object along the path, then another link is chosen having routing information containing another node. This other link may be chosen in a round robin manner if there are multiple links to choose from. If multiple links having such routing information exist at an object along the path, then one of the links is chosen in a round robin manner. The method may also be used in uniprocessor systems such as a system with a one-processor node for simply establishing multiple paths to provide fault tolerance.
* 5630173 Methods and apparatus for bus access arbitration of nodes organized into acyclic directed graph by cyclic token passing and alternatively propagating request to root node and grant signal to the child node
* 5784648 Token style arbitration on a serial bus by passing an unrequested bus grand signal and returning the token by a token refusal signal
* 5802289 Method for propagating preemptive bus initialization on an acyclic directed graph
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