On Tue, Jun 05, 2012 at 12:11:46PM +0800, Ram Pai wrote: >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 Thanks, Ram. I found I missed one important field in pci_bus. > >> >> 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 |---+ >> +---------------+ +-----------------+ -- Richard Yang Help you, Help me -- 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
