From: Matthew Garrett <mjg59@srcf.ucam.org>
To: Joerg Roedel <joro@8bytes.org>
Cc: linux-kernel@vger.kernel.org, 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 20:05:36 +0100 [thread overview]
Message-ID: <20100930190536.GA18845@srcf.ucam.org> (raw)
In-Reply-To: <20100930184301.GP15338@8bytes.org>
On Thu, Sep 30, 2010 at 08:43:01PM +0200, Joerg Roedel wrote:
> Enabling the IOMMU device is only part of what the BIOS is supposed to
> do to get the IOMMU ready for the OS. A handful of registers in the
> config space of the device and the IOMMU MMIO region must also be
> restored. Thats the simple part. The IOMMU device also spans two
> indirect register spaces to configure the IOMMU caches. I have no idea
> yet how this need to be configured. The plan is definitly to
> work-around a missing IOMMU device in the IOMMU driver. But I am still
> talking to some people to find out what exactly must be done, especially
> with the indirect register spaces.
Chapter 8 of the register setup guide seems to have something on this -
I'll try saving and restoring all of the setup it performs to see if it
improves things.
--
Matthew Garrett | mjg59@srcf.ucam.org
next prev parent reply other threads:[~2010-09-30 19:05 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
2010-09-30 18:43 ` Joerg Roedel
2010-09-30 19:05 ` Matthew Garrett [this message]
2010-10-01 17:58 ` Bjorn Helgaas
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