On Fri, Dec 02, 2005 at 11:50:59AM +0000, vidyut karan wrote:
> Hi All,
> There are certain fields in "struct pci_bus" in linux 2.6.14 which i am not able to understand. I have listed only the relavant fields.
> struct pci_bus {
> ..............
> ..............
> struct pci_dev *self; /* bridge device as seen by parent */
> ..............
> unsigned char primary; /* number of primary bridge */
> unsigned char secondary; /* number of secondary bridge */
> unsigned char subordinate; /* max number of subordinate buses */
> ...............
> };
>
> there are refernce to "bridges" in comments. Which bus does this
> "struct pci_bus" describe, the primary bus of a bridge or the
> secondary bus?
This specific pci bus device.
> Also as commented "primary" is the number of primary bridge. Please
> explain what is meant by "primary bridge" with respect to a bus.
> Similarly for "secondary" field.
I think the PCI spec explains these fields, please see that for details.
thanks,
greg k-h
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