From mboxrd@z Thu Jan  1 00:00:00 1970
From: Anonymous <anonymous-MUDIJn/1Q3AaHdxRYFc1FNBPR1lH4CV8@public.gmane.org>
Subject: Re: [PATCH 04/13] pci: New pci_dma_quirk()
Date: Thu, 17 May 2012 15:19:51 +0800
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To: Alex Williamson <alex.williamson-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
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List-Id: iommu@lists.linux-foundation.org

Alex,

On Sat, May 12, 2012 at 6:55 AM, Alex Williamson
<alex.williamson-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> wrote:
> Integrating IOMMU groups more closely into the driver core allows
> us to more easily work around DMA quirks. =A0The Ricoh multifunction
> controller is a favorite example of devices that are currently
> incompatible with IOMMU isolation as all the functions use the
> requestor ID of function 0 for DMA. =A0Passing this device into
> pci_dma_quirk returns the PCI device to use for DMA. =A0The IOMMU
> driver can then construct an IOMMU group including both devices.
>

Please give some thought to the Marvell SATA controller quirk as well.

Instead of multiple visible functions using the same requester ID of
function 0, the Marvell device only makes function 0 visible, but uses
the requestor ID of function 1 as well during DMA.

See https://bugzilla.redhat.com/show_bug.cgi?id=3D757166

--
A.