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    SubjectRe: /proc/bus/pci
    On Thu, 2003-06-05 at 08:05, Albert Cahalan wrote:
    > On Thu, 2003-06-05 at 00:23, Linus Torvalds wrote:
    > > On Wed, 4 Jun 2003, Albert Cahalan wrote:
    > > >
    > > > I notice that /proc/bus/pci doesn't offer a sane
    > > > interface for multiple PCI domains and choice of BAR.
    > > > What do people think of this?
    > > >
    > > > bus/pci/00/00.0 -> ../hose0/bus0/dev0/fn0/config-space
    > >
    > > Why do we have that stupid "hose" name? Only because of strange alpha
    > > naming, or did somebody else also use that incredibly silly name?
    > >
    > > Please talk about "domains", at least it makes some sense as a name.
    >
    > "hose" does sound pretty crazy, but...
    >
    > a. "domain" is way overused in OSes and programming
    > b. "hose" is short
    > c. with old names like "d4", "hose" is better for tab-completion
    >
    > I'm sure somebody could name a dozen things called "domain".
    >
    > > I'm also hoping that /proc/bus will eventually go away, so I don't see a
    > > major problem with not understanding multiple domains at that level.
    > >
    > > On a /sys/bus/xxx level we actually should already be able to handle
    > > multiple domains, but the naming is broken. However, in /sys we should be
    > > able to nicely handling non-zero domains by just extending the name space
    > > a bit.
    >
    > Does this mean you'd like to see per-BAR kobject stuff?
    > If I'm not mistaken, that is required for sysfs to work.
    >
    > So sysfs then has:
    >
    > devices/pci2/02:0b.0 -> ../hose0/bus2/dev11/fn0
    > devices/hose0/bus2/dev11/fn0/config-space
    > devices/hose0/bus2/dev11/fn0/bar0
    > devices/hose0/bus2/dev11/fn0/bar1
    > devices/hose0/bus2/dev11/fn0/bar2
    > devices/hose0/bus2/dev11/fn0/class
    > devices/hose0/bus2/dev11/fn0/power
    > devices/hose0/bus2/dev11/fn0/subsystem_vendor
    > devices/hose0/bus2/dev11/fn0/and-so-on
    >
    > To make this clear, mmap() on bar0 would get you
    > a mapping of that BAR.

    Some of the IBMers use "phb" instead of "hose" or "domain".
    It's Primary Host Bridge, which can only be confused
    with Pointy-Haired Boss AFAIK.


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