linux-kernel - Re: PCI PM: Restore standard config registers of all devices early

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Date:	Tue, 03 Feb 2009 15:03:50 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Jesse Barnes <jesse.barnes@...el.com>,
	Andreas Schwab <schwab@...e.de>, Len Brown <lenb@...nel.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: PCI PM: Restore standard config registers of all devices early

On Mon, 2009-02-02 at 19:47 -0800, Linus Torvalds wrote:
> 
> On Tue, 3 Feb 2009, Benjamin Herrenschmidt wrote:
> > On Tue, 2009-02-03 at 12:46 +1100, Benjamin Herrenschmidt wrote:
> > >
> > > Radeons don't do much with config space... the worst we may miss I
> > > suppose is subsystem vendor/device... Maybe I'll add something to
> > > explicitely save and restore it or X might get upset. I'll have a look.
> > 
> > Actually, subsystem stuff is below 0x40 so it should be fine too.
> 
> The things above 0x40 tend to be:
> 
>  - capabilities (values and next-pointers)
> 
>    The PCI layer will save a random couple of these (read: the ones it 
>    cares about)
> 
>  - random non-architected values specific to that chip. And sometimes 
>    these are important. Like ISA interrupt routing information for cardbus 
>    controllers. Or timing values set up by the BIOS.

Right, I've seen such things, but in our case, all the radeons I support
in there should be ok with just 64 bytes.

Cheers,
Ben.

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