Re: Faking a Hot-Unplug event in kernel 2.6

[Greg KH <greg@kroah.com>]

On Thu, Jun 02, 2005 at 04:51:28PM +0530, Rajat Jain wrote:
> Hi,
> 
> Please pardon me if this is not the right list for this post. I'm
> using 2.6 Kernel. I'm having a (Hot-pluggable) Qlogic HBA plugged into
> a PCI Express Slot.

There is a pci hotplug mailing list for Linux, if you have lots of
questions about this.

> I want to fake an hot-unplug event for this HBA, without physically
> removing it from the slot. Basically what I want is that while the HBA
> is still physically present at the slot, I want to fire a command /
> program that would fake the hot-unplug event for this slot, and thus
> will deregister the HBA from Linux. Ideally, I want to do this from
> userspace. But if it is not possible, then I can go for a kernel
> module as well.

Um, why not do it for real?
	echo 0 > /sys/pci/slots/SLOTNAME/power

if you have a hotplug controller (and you say you do.)

> I think that this feature was made available by "Fake PCI Hot plug
> controller Driver", but I believe that can only be used if my system
> does not have REAL hot-plugging slots.

Well, the fake driver is for systems with no hotplug controllers.

> Can "Fake PCI Hot-plug
> Controller Driver (fakephp.ko)" and "PCI Express Hot-plug Controller
> Driver (pciehp.ko)" Co-exist ???

No, why would you want it to?

> (So that I can manually give fake unplug event and THEN remove the
> device; While hot-plugging, I want PCI Express HPC driver to take care
> of every thing)

Why would you want to do this?

> Is it possible to do what I am trying to do?

Only if you really want to confuse the kernel.

thanks,

greg k-h


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