linux-kernel - Re: restore missing PCI registers after reset

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Message-ID: <20060726164246.GE9871@suse.de>
Date:	Wed, 26 Jul 2006 09:42:46 -0700
From:	Greg KH <gregkh@...e.de>
To:	"Michael S. Tsirkin" <mst@...lanox.co.il>
Cc:	linux-kernel@...r.kernel.org, openib-general@...nib.org,
	Roland Dreier <rolandd@...co.com>,
	Justin Forbes <jmforbes@...uxtx.org>,
	Zwane Mwaikambo <zwane@....linux.org.uk>,
	Theodore Ts'o <tytso@....edu>,
	Randy Dunlap <rdunlap@...otime.net>,
	Dave Jones <davej@...hat.com>,
	Chuck Wolber <chuckw@...ntumlinux.com>,
	Chris Wedgwood <reviews@...cw.f00f.org>, torvalds@...l.org,
	akpm@...l.org, alan@...rguk.ukuu.org.uk,
	Chris Wright <chrisw@...s-sol.org>
Subject: Re: restore missing PCI registers after reset

On Wed, Jul 26, 2006 at 07:32:26PM +0300, Michael S. Tsirkin wrote:
> Quoting r. Greg KH <gregkh@...e.de>:
> > I think pci_restore_state() already restores the msi and msix state,
> > take a look at the latest kernel version :)
> 
> Yes, I know :)
> but I am not talking abotu MSI/MSI-X, I am talking about the following:
> > > >   PCI-X device: PCI-X command register
> > > >   PCI-X bridge: upstream and downstream split transaction registers
> > > >   PCI Express : PCI Express device control and link control registers
> 
> these register values include maxumum MTU for PCI express and other vital
> data.

Make up a patch that shows how you would save these in a generic way and
we can discuss it.  I know people have talked about saving the extended
PCI config space for devices that need it, so that might be all you
need to do here.

thanks,

greg k-h
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