Re: [Pcihpd-discuss] [RFC] New sysfs tree for hotplug

[Grant Grundler]

On Fri, Apr 16, 2004 at 03:34:36PM -0700, Greg KH wrote:
> >  Recent large machines have many PCI devices and some boards that
> > contain devices (e.g. CPU, memory, and/or I/O devices).  A certain PCI
> > device (PCI1) might be connected with other one (PCI2), which means that
> > there is a dependency between PCI1 and PCI2.
> 
> You have this today?

I interpreted his comments to mean PCI-PCI Bridges.
eg something like a 4-port NIC which usually has a PCI-PCI bridge
to "isolate" multiple PCI devices (NICs):
 +-[60]---01.0-[61]--+-04.0  Digital Equipment Corporation DECchip 21142/43
 |                   +-05.0  Digital Equipment Corporation DECchip 21142/43
 |                   +-06.0  Digital Equipment Corporation DECchip 21142/43
 |                   \-07.0  Digital Equipment Corporation DECchip 21142/43
...

I thought this was already handled though so I may be misunderstanding.
Keiichiro, an example would be very helpful in understanding.

...
> Hm, no.  What about usb, firewire, scsi and any other future bus that
> can be "hotpluggable".  The kernel doesn't treat them differently, and
> we shouldn't either.

SCSI has a heirarchy as well. Ie LUNs can be removed without
removing the target (RAID controllers). Normal JBOD use equates
LUNs and targets.

grant
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