Selectively coupling a PCI host bridge to multiple PCI communication paths
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United States of America Patent
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Mar 13, 2018
Issued Date -
N/A
app pub date -
Feb 26, 2016
filing date -
Nov 7, 2013
priority date (Note) -
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Abstract
Instead of disabling PCI communication between system resources in a host computing device and I/O devices when a PCI Host Bridge (PHB) is reset, the host computing device may include a PCI communication path for maintaining communication between the system resources and the I/O devices. In one embodiment, the redundant PCI communication path includes a second PHB that is maintained in a standby state. The host may monitor the errors generated by a plurality of master PHBs and select a master PHB that satisfies an error threshold. The second PHB (i.e., a servant PHB) is assigned to backup the master PHB that satisfies the error threshold. The master PHB can then be reset while the second PHB maintains PCI communication between the host and the I/O devices.
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