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    SubjectRe: Going beyond 256 PCI buses
    "David S. Miller" wrote:
    > 1) Extending the type bus numbers use inside the kernel.
    >
    > Basically how most multi-controller platforms work now
    > is they allocate bus numbers in the 256 bus space as
    > controllers are probed. If we change the internal type
    > used by the kernel to "u32" or whatever, we expand that
    > available space accordingly.
    >
    > For the lazy, basically go into include/linux/pci.h
    > and change the "unsigned char"s in struct pci_bus into
    > some larger type. This is mindless work.

    Why do you want to make the bus number larger than the PCI bus number
    register?

    It seems like adding 'unsigned int domain_num' makes more sense, and is
    more correct. Maybe that implies fixing up other code to use a
    (domain,bus) pair, but that's IMHO a much better change than totally
    changing the interpretation of pci_bus::bus_number...


    > 2) Figure out what to do wrt. sys_pciconfig_{read,write}()

    3) (tiny issue) Change pci_dev::slot_name such that it includes the
    domain number. This is passed to userspace by SCSI and net drivers as a
    way to allow userspace to associate a kernel interface with a bus
    device.


    > Basically, this 256 bus limit in Linux is a complete fallacy.

    yep

    Regards,

    Jeff


    --
    Jeff Garzik | Andre the Giant has a posse.
    Building 1024 |
    MandrakeSoft |
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