From: Matthew Garrett <mjg59@srcf.ucam.org>
To: linux-kernel@vger.kernel.org
Cc: linux-pci@vger.kernel.org, joerg.roedel@amd.com,
jbarnes@virtuousgeek.org
Subject: Re: [PATCH] pci: Reenable the AMD IOMMU if it's mysteriously vanished over suspend
Date: Thu, 30 Sep 2010 18:39:45 +0100 [thread overview]
Message-ID: <20100930173945.GA16596@srcf.ucam.org> (raw)
In-Reply-To: <1285861108-24122-1-git-send-email-mjg@redhat.com>
On Thu, Sep 30, 2010 at 11:38:28AM -0400, Matthew Garrett wrote:
> AMD's reference BIOS code had a bug that could result in the firmware
> failing to reenable the iommu on resume. It transpires that this causes
> certain less than desirable behaviour when it comes to PCI accesses, to
> whit them ending up somewhere near Bristol when the more desirable outcome
> was Edinburgh. Sadness ensues, perhaps along with filesystem corruption.
> Let's make sure that it gets turned back on.
Of course, this isn't actually sufficient - nothing in the iommu code
appears to reprogram the BAR, for instance. Joerg, how is this meant to
work?
--
Matthew Garrett | mjg59@srcf.ucam.org
next prev parent reply other threads:[~2010-09-30 17:39 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-30 15:38 [PATCH] pci: Reenable the AMD IOMMU if it's mysteriously vanished over suspend Matthew Garrett
2010-09-30 17:39 ` Matthew Garrett [this message]
2010-09-30 18:43 ` Joerg Roedel
2010-09-30 19:05 ` Matthew Garrett
2010-10-01 17:58 ` Bjorn Helgaas
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