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SubjectRe: /proc/bus/pci
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.


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