On Tue, Jun 05, 2012 at 11:26:27AM +0800, Richard Yang wrote: > > All, > > I draw a chart on the relationship of bridge/bus/devics. > > I am not sure it is exact, so please correct me if it is not correct. A clearer representation can be found at http://tldp.org/LDP/tlk/dd/pci.html in section 6.6.1 > > BTW, the pci_bus->self, pci_bus->bridge seem to point the same thing. > So this is really necessary to do this? pci_bus->self points to the pci_dev structure, and pci_bus->bridge points to the device structure. Both correspond to the same bridge. BTW: device structure is the basic structure to represent any device in the system, not necessarily pci device. > > Bus 0(pci_bus) > +--------------------+<----+ > | | | > +--------------------+ | > | > | > Bridge(pci_dev) | > +--------------------+<----|---+--------------+ > |subordinate(pci_bus)|-+ | | | > +--------------------+ | | | | > | | | | > | | | | > | | | | > Bus 1(pci_bus) | | | | > +--->+-------------------+<-+ | | | > | |parent(pci_bus) |------+ | | > | +-------------------+ | | > | |self(pci_dev) |----------+ | > | |bridge(device) | | > | +-------------------+ | > | |devices(list_head) | | > | +--------+----------+ | > | | | > | ----+--+---+---- | > pci_dev | | | pci_dev | > +---------------+<--|----------+ +--------->+-----------------+ | > |bus(pci_bus) |---+ |bus(pci_bus) | | > +---------------+ +-----------------+ | > |dev.parent | |dev.parent |---+ > +---------------+ +-----------------+ -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
