linux-kernel - Re: amd64-agp: resume but too late?

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Message-ID: <20080528104250.GC5728@elf.ucw.cz>
Date:	Wed, 28 May 2008 12:42:50 +0200
From:	Pavel Machek <pavel@...e.cz>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	kernel list <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	Dave Jones <davej@...emonkey.org.uk>,
	Andi Kleen <andi@...stfloor.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: amd64-agp: resume but too late?

On Tue 2008-05-27 14:18:19, Thomas Gleixner wrote:
> On Mon, 26 May 2008, Pavel Machek wrote:
> > Hi!
> > 
> > I don't get it:
> > 
> > --- a/drivers/char/agp/amd64-agp.c
> > +++ b/drivers/char/agp/amd64-agp.c
> > @@ -549,6 +549,8 @@ static int agp_amd64_suspend(struct pci_
> >         return 0;
> >  }
> >  
> > +/* FIXME: this is strange; we enable iommu translation here, but that
> > + * may be too late, no? */
> >  static int agp_amd64_resume(struct pci_dev *pdev)
> >  {
> >         pci_set_power_state(pdev, PCI_D0);
> > 
> > ...but resume is normal pci device, so other devices may be resumed
> > before this one, and already depend on iommu running...
> > 
> > How is this supposed to work? Should agp_amd64_resume be called from
> > sysdev or something like that?
> 
> Hmm, you sent a patch some days ago to change it to
> suspend_late/resume_early. Is the discussion resolved about that ?

I'm not aware of such patch. I don't think I sent it.

I did add suspend/resume support to pci-gart_64.c , which is
confusingly similar code. That patch needs a bit more testing, and
some de-uglyfication.
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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