Re: [PATCH] PCI: Add pci shutdown ability

From: Pavel Machek
Date: Mon Apr 25 2005 - 16:18:20 EST


> > > Well it seems that people are starting to want to hook the reboot
> > > notifier, or the device shutdown facility in order to properly shutdown
> > > pci drivers to make kexec work nicer.
> > >
> > > So here's a patch for the PCI core that allows pci drivers to now just
> > > add a "shutdown" notifier function that will be called when the system
> > > is being shutdown. It happens just after the reboot notifier happens,
> > > and it should happen in the proper device tree order, so everyone should
> > > be happy.
> > >
> > > Any objections to this patch?
> >
> > Yes.
> >
> > I believe it should just do suspend(PMSG_SUSPEND) before system
> > shutdown. If you think distintion between shutdown and suspend is
> > important (I am not 100% convinced it is), we can just add flag
> > saying "this is system shutdown".
> So if I understand this correctly, you'd like to manually turn off devices
> during a power off. I believe the ACPI spec recommends this for S4 (but also
> to leave on wake devices), but not necessarily S5. Still it may be a good
> idea. Comments?

It is neccessary for some machines (interrupt controller) or machine
will not power down...

> > Actually this patch should be in the queue somewhere... We had it in
> > suse trees for a long time, and IMO it can solve problem easily.
> Yeah, that's what I had in mind when I mentioned PMSG_FREEZE. It seems
> to replace "shutdown" in many ways, is this correct?

Yes. (Actually I'm not sure if PMSG_FREEZE or PMSG_SUSPEND is right
thing to do for suspend.)
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