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

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Message-ID: <20060726102944.GA9411@mellanox.co.il>
Date:	Wed, 26 Jul 2006 13:29:44 +0300
From:	"Michael S. Tsirkin" <mst@...lanox.co.il>
To:	Greg KH <gregkh@...e.de>
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

Quoting r. Greg KH <gregkh@...e.de>:
> Subject: [patch 02/45] IB/mthca: restore missing PCI registers after reset
> ------------------
> mthca does not restore the following PCI-X/PCI Express registers after reset:
>   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
> 
> This causes instability and/or bad performance on systems where one of
> these registers is set to a non-default value by BIOS.
> 
> Signed-off-by: Michael S. Tsirkin <mst@...lanox.co.il>
> Signed-off-by: Chris Wright <chrisw@...s-sol.org>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

By the way, Greg, this code is completely generic, and the same seems to apply
to all PCI-X/PCI-Express devices - should not pci_restore_state and
friends really know about these registers, as well?

What do you think?

-- 
MST
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